SemaDeclCXX.cpp revision 77bb1aa78bcd26e42c0382043e65a2b03242be4d
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 << Context.getTypeDeclType(ClassDecl) 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 ParmVarDecl *Param = Constructor->getParamDecl(0); 1549 QualType ParamType = Param->getType().getNonReferenceType(); 1550 1551 Expr *MemberExprBase = 1552 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1553 SourceLocation(), ParamType, 0); 1554 1555 1556 Expr *CopyCtorArg = 1557 MemberExpr::Create(SemaRef.Context, MemberExprBase, /*IsArrow=*/false, 1558 0, SourceRange(), Field, 1559 DeclAccessPair::make(Field, Field->getAccess()), 1560 SourceLocation(), 0, 1561 Field->getType().getNonReferenceType()); 1562 1563 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1564 InitializationKind InitKind = 1565 InitializationKind::CreateDirect(Constructor->getLocation(), 1566 SourceLocation(), SourceLocation()); 1567 1568 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1569 &CopyCtorArg, 1); 1570 1571 Sema::OwningExprResult MemberInit = 1572 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1573 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArg, 1), 0); 1574 if (MemberInit.isInvalid()) 1575 return true; 1576 1577 CXXMemberInit = 0; 1578 return false; 1579 } 1580 1581 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1582 1583 QualType FieldBaseElementType = 1584 SemaRef.Context.getBaseElementType(Field->getType()); 1585 1586 if (FieldBaseElementType->isRecordType()) { 1587 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1588 InitializationKind InitKind = 1589 InitializationKind::CreateDefault(Constructor->getLocation()); 1590 1591 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1592 Sema::OwningExprResult MemberInit = 1593 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1594 Sema::MultiExprArg(SemaRef, 0, 0)); 1595 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1596 if (MemberInit.isInvalid()) 1597 return true; 1598 1599 CXXMemberInit = 1600 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1601 Field, SourceLocation(), 1602 SourceLocation(), 1603 MemberInit.takeAs<Expr>(), 1604 SourceLocation()); 1605 return false; 1606 } 1607 1608 if (FieldBaseElementType->isReferenceType()) { 1609 SemaRef.Diag(Constructor->getLocation(), 1610 diag::err_uninitialized_member_in_ctor) 1611 << (int)Constructor->isImplicit() 1612 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1613 << 0 << Field->getDeclName(); 1614 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1615 return true; 1616 } 1617 1618 if (FieldBaseElementType.isConstQualified()) { 1619 SemaRef.Diag(Constructor->getLocation(), 1620 diag::err_uninitialized_member_in_ctor) 1621 << (int)Constructor->isImplicit() 1622 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1623 << 1 << Field->getDeclName(); 1624 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1625 return true; 1626 } 1627 1628 // Nothing to initialize. 1629 CXXMemberInit = 0; 1630 return false; 1631} 1632 1633bool 1634Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1635 CXXBaseOrMemberInitializer **Initializers, 1636 unsigned NumInitializers, 1637 bool AnyErrors) { 1638 if (Constructor->getDeclContext()->isDependentContext()) { 1639 // Just store the initializers as written, they will be checked during 1640 // instantiation. 1641 if (NumInitializers > 0) { 1642 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1643 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1644 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1645 memcpy(baseOrMemberInitializers, Initializers, 1646 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1647 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1648 } 1649 1650 return false; 1651 } 1652 1653 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1654 1655 // FIXME: Handle implicit move constructors. 1656 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1657 ImplicitInitKind = IIK_Copy; 1658 1659 // We need to build the initializer AST according to order of construction 1660 // and not what user specified in the Initializers list. 1661 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1662 if (!ClassDecl) 1663 return true; 1664 1665 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1666 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1667 bool HadError = false; 1668 1669 for (unsigned i = 0; i < NumInitializers; i++) { 1670 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1671 1672 if (Member->isBaseInitializer()) 1673 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1674 else 1675 AllBaseFields[Member->getMember()] = Member; 1676 } 1677 1678 // Keep track of the direct virtual bases. 1679 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1680 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1681 E = ClassDecl->bases_end(); I != E; ++I) { 1682 if (I->isVirtual()) 1683 DirectVBases.insert(I); 1684 } 1685 1686 // Push virtual bases before others. 1687 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1688 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1689 1690 if (CXXBaseOrMemberInitializer *Value 1691 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1692 AllToInit.push_back(Value); 1693 } else if (!AnyErrors) { 1694 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1695 CXXBaseOrMemberInitializer *CXXBaseInit; 1696 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1697 VBase, IsInheritedVirtualBase, 1698 CXXBaseInit)) { 1699 HadError = true; 1700 continue; 1701 } 1702 1703 AllToInit.push_back(CXXBaseInit); 1704 } 1705 } 1706 1707 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1708 E = ClassDecl->bases_end(); Base != E; ++Base) { 1709 // Virtuals are in the virtual base list and already constructed. 1710 if (Base->isVirtual()) 1711 continue; 1712 1713 if (CXXBaseOrMemberInitializer *Value 1714 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1715 AllToInit.push_back(Value); 1716 } else if (!AnyErrors) { 1717 CXXBaseOrMemberInitializer *CXXBaseInit; 1718 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1719 Base, /*IsInheritedVirtualBase=*/false, 1720 CXXBaseInit)) { 1721 HadError = true; 1722 continue; 1723 } 1724 1725 AllToInit.push_back(CXXBaseInit); 1726 } 1727 } 1728 1729 // non-static data members. 1730 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1731 E = ClassDecl->field_end(); Field != E; ++Field) { 1732 if ((*Field)->isAnonymousStructOrUnion()) { 1733 if (const RecordType *FieldClassType = 1734 Field->getType()->getAs<RecordType>()) { 1735 CXXRecordDecl *FieldClassDecl 1736 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1737 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1738 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1739 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1740 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1741 // set to the anonymous union data member used in the initializer 1742 // list. 1743 Value->setMember(*Field); 1744 Value->setAnonUnionMember(*FA); 1745 AllToInit.push_back(Value); 1746 break; 1747 } 1748 } 1749 } 1750 continue; 1751 } 1752 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1753 AllToInit.push_back(Value); 1754 continue; 1755 } 1756 1757 if (AnyErrors) 1758 continue; 1759 1760 CXXBaseOrMemberInitializer *Member; 1761 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1762 *Field, Member)) { 1763 HadError = true; 1764 continue; 1765 } 1766 1767 // If the member doesn't need to be initialized, it will be null. 1768 if (Member) 1769 AllToInit.push_back(Member); 1770 } 1771 1772 NumInitializers = AllToInit.size(); 1773 if (NumInitializers > 0) { 1774 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1775 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1776 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1777 memcpy(baseOrMemberInitializers, AllToInit.data(), 1778 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1779 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1780 1781 // Constructors implicitly reference the base and member 1782 // destructors. 1783 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1784 Constructor->getParent()); 1785 } 1786 1787 return HadError; 1788} 1789 1790static void *GetKeyForTopLevelField(FieldDecl *Field) { 1791 // For anonymous unions, use the class declaration as the key. 1792 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1793 if (RT->getDecl()->isAnonymousStructOrUnion()) 1794 return static_cast<void *>(RT->getDecl()); 1795 } 1796 return static_cast<void *>(Field); 1797} 1798 1799static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1800 return Context.getCanonicalType(BaseType).getTypePtr(); 1801} 1802 1803static void *GetKeyForMember(ASTContext &Context, 1804 CXXBaseOrMemberInitializer *Member, 1805 bool MemberMaybeAnon = false) { 1806 if (!Member->isMemberInitializer()) 1807 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1808 1809 // For fields injected into the class via declaration of an anonymous union, 1810 // use its anonymous union class declaration as the unique key. 1811 FieldDecl *Field = Member->getMember(); 1812 1813 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1814 // data member of the class. Data member used in the initializer list is 1815 // in AnonUnionMember field. 1816 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1817 Field = Member->getAnonUnionMember(); 1818 1819 // If the field is a member of an anonymous struct or union, our key 1820 // is the anonymous record decl that's a direct child of the class. 1821 RecordDecl *RD = Field->getParent(); 1822 if (RD->isAnonymousStructOrUnion()) { 1823 while (true) { 1824 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1825 if (Parent->isAnonymousStructOrUnion()) 1826 RD = Parent; 1827 else 1828 break; 1829 } 1830 1831 return static_cast<void *>(RD); 1832 } 1833 1834 return static_cast<void *>(Field); 1835} 1836 1837static void 1838DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1839 const CXXConstructorDecl *Constructor, 1840 CXXBaseOrMemberInitializer **Inits, 1841 unsigned NumInits) { 1842 if (Constructor->getDeclContext()->isDependentContext()) 1843 return; 1844 1845 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1846 == Diagnostic::Ignored) 1847 return; 1848 1849 // Build the list of bases and members in the order that they'll 1850 // actually be initialized. The explicit initializers should be in 1851 // this same order but may be missing things. 1852 llvm::SmallVector<const void*, 32> IdealInitKeys; 1853 1854 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1855 1856 // 1. Virtual bases. 1857 for (CXXRecordDecl::base_class_const_iterator VBase = 1858 ClassDecl->vbases_begin(), 1859 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1860 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1861 1862 // 2. Non-virtual bases. 1863 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1864 E = ClassDecl->bases_end(); Base != E; ++Base) { 1865 if (Base->isVirtual()) 1866 continue; 1867 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1868 } 1869 1870 // 3. Direct fields. 1871 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1872 E = ClassDecl->field_end(); Field != E; ++Field) 1873 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1874 1875 unsigned NumIdealInits = IdealInitKeys.size(); 1876 unsigned IdealIndex = 0; 1877 1878 CXXBaseOrMemberInitializer *PrevInit = 0; 1879 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1880 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1881 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1882 1883 // Scan forward to try to find this initializer in the idealized 1884 // initializers list. 1885 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1886 if (InitKey == IdealInitKeys[IdealIndex]) 1887 break; 1888 1889 // If we didn't find this initializer, it must be because we 1890 // scanned past it on a previous iteration. That can only 1891 // happen if we're out of order; emit a warning. 1892 if (IdealIndex == NumIdealInits) { 1893 assert(PrevInit && "initializer not found in initializer list"); 1894 1895 Sema::SemaDiagnosticBuilder D = 1896 SemaRef.Diag(PrevInit->getSourceLocation(), 1897 diag::warn_initializer_out_of_order); 1898 1899 if (PrevInit->isMemberInitializer()) 1900 D << 0 << PrevInit->getMember()->getDeclName(); 1901 else 1902 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1903 1904 if (Init->isMemberInitializer()) 1905 D << 0 << Init->getMember()->getDeclName(); 1906 else 1907 D << 1 << Init->getBaseClassInfo()->getType(); 1908 1909 // Move back to the initializer's location in the ideal list. 1910 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1911 if (InitKey == IdealInitKeys[IdealIndex]) 1912 break; 1913 1914 assert(IdealIndex != NumIdealInits && 1915 "initializer not found in initializer list"); 1916 } 1917 1918 PrevInit = Init; 1919 } 1920} 1921 1922namespace { 1923bool CheckRedundantInit(Sema &S, 1924 CXXBaseOrMemberInitializer *Init, 1925 CXXBaseOrMemberInitializer *&PrevInit) { 1926 if (!PrevInit) { 1927 PrevInit = Init; 1928 return false; 1929 } 1930 1931 if (FieldDecl *Field = Init->getMember()) 1932 S.Diag(Init->getSourceLocation(), 1933 diag::err_multiple_mem_initialization) 1934 << Field->getDeclName() 1935 << Init->getSourceRange(); 1936 else { 1937 Type *BaseClass = Init->getBaseClass(); 1938 assert(BaseClass && "neither field nor base"); 1939 S.Diag(Init->getSourceLocation(), 1940 diag::err_multiple_base_initialization) 1941 << QualType(BaseClass, 0) 1942 << Init->getSourceRange(); 1943 } 1944 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1945 << 0 << PrevInit->getSourceRange(); 1946 1947 return true; 1948} 1949 1950typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1951typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1952 1953bool CheckRedundantUnionInit(Sema &S, 1954 CXXBaseOrMemberInitializer *Init, 1955 RedundantUnionMap &Unions) { 1956 FieldDecl *Field = Init->getMember(); 1957 RecordDecl *Parent = Field->getParent(); 1958 if (!Parent->isAnonymousStructOrUnion()) 1959 return false; 1960 1961 NamedDecl *Child = Field; 1962 do { 1963 if (Parent->isUnion()) { 1964 UnionEntry &En = Unions[Parent]; 1965 if (En.first && En.first != Child) { 1966 S.Diag(Init->getSourceLocation(), 1967 diag::err_multiple_mem_union_initialization) 1968 << Field->getDeclName() 1969 << Init->getSourceRange(); 1970 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1971 << 0 << En.second->getSourceRange(); 1972 return true; 1973 } else if (!En.first) { 1974 En.first = Child; 1975 En.second = Init; 1976 } 1977 } 1978 1979 Child = Parent; 1980 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1981 } while (Parent->isAnonymousStructOrUnion()); 1982 1983 return false; 1984} 1985} 1986 1987/// ActOnMemInitializers - Handle the member initializers for a constructor. 1988void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1989 SourceLocation ColonLoc, 1990 MemInitTy **meminits, unsigned NumMemInits, 1991 bool AnyErrors) { 1992 if (!ConstructorDecl) 1993 return; 1994 1995 AdjustDeclIfTemplate(ConstructorDecl); 1996 1997 CXXConstructorDecl *Constructor 1998 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1999 2000 if (!Constructor) { 2001 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2002 return; 2003 } 2004 2005 CXXBaseOrMemberInitializer **MemInits = 2006 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2007 2008 // Mapping for the duplicate initializers check. 2009 // For member initializers, this is keyed with a FieldDecl*. 2010 // For base initializers, this is keyed with a Type*. 2011 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2012 2013 // Mapping for the inconsistent anonymous-union initializers check. 2014 RedundantUnionMap MemberUnions; 2015 2016 bool HadError = false; 2017 for (unsigned i = 0; i < NumMemInits; i++) { 2018 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2019 2020 if (Init->isMemberInitializer()) { 2021 FieldDecl *Field = Init->getMember(); 2022 if (CheckRedundantInit(*this, Init, Members[Field]) || 2023 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2024 HadError = true; 2025 } else { 2026 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2027 if (CheckRedundantInit(*this, Init, Members[Key])) 2028 HadError = true; 2029 } 2030 } 2031 2032 if (HadError) 2033 return; 2034 2035 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2036 2037 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2038} 2039 2040void 2041Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2042 CXXRecordDecl *ClassDecl) { 2043 // Ignore dependent contexts. 2044 if (ClassDecl->isDependentContext()) 2045 return; 2046 2047 // FIXME: all the access-control diagnostics are positioned on the 2048 // field/base declaration. That's probably good; that said, the 2049 // user might reasonably want to know why the destructor is being 2050 // emitted, and we currently don't say. 2051 2052 // Non-static data members. 2053 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2054 E = ClassDecl->field_end(); I != E; ++I) { 2055 FieldDecl *Field = *I; 2056 2057 QualType FieldType = Context.getBaseElementType(Field->getType()); 2058 2059 const RecordType* RT = FieldType->getAs<RecordType>(); 2060 if (!RT) 2061 continue; 2062 2063 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2064 if (FieldClassDecl->hasTrivialDestructor()) 2065 continue; 2066 2067 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2068 CheckDestructorAccess(Field->getLocation(), Dtor, 2069 PDiag(diag::err_access_dtor_field) 2070 << Field->getDeclName() 2071 << FieldType); 2072 2073 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2074 } 2075 2076 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2077 2078 // Bases. 2079 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2080 E = ClassDecl->bases_end(); Base != E; ++Base) { 2081 // Bases are always records in a well-formed non-dependent class. 2082 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2083 2084 // Remember direct virtual bases. 2085 if (Base->isVirtual()) 2086 DirectVirtualBases.insert(RT); 2087 2088 // Ignore trivial destructors. 2089 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2090 if (BaseClassDecl->hasTrivialDestructor()) 2091 continue; 2092 2093 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2094 2095 // FIXME: caret should be on the start of the class name 2096 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2097 PDiag(diag::err_access_dtor_base) 2098 << Base->getType() 2099 << Base->getSourceRange()); 2100 2101 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2102 } 2103 2104 // Virtual bases. 2105 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2106 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2107 2108 // Bases are always records in a well-formed non-dependent class. 2109 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2110 2111 // Ignore direct virtual bases. 2112 if (DirectVirtualBases.count(RT)) 2113 continue; 2114 2115 // Ignore trivial destructors. 2116 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2117 if (BaseClassDecl->hasTrivialDestructor()) 2118 continue; 2119 2120 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2121 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2122 PDiag(diag::err_access_dtor_vbase) 2123 << VBase->getType()); 2124 2125 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2126 } 2127} 2128 2129void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2130 if (!CDtorDecl) 2131 return; 2132 2133 if (CXXConstructorDecl *Constructor 2134 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2135 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2136} 2137 2138bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2139 unsigned DiagID, AbstractDiagSelID SelID, 2140 const CXXRecordDecl *CurrentRD) { 2141 if (SelID == -1) 2142 return RequireNonAbstractType(Loc, T, 2143 PDiag(DiagID), CurrentRD); 2144 else 2145 return RequireNonAbstractType(Loc, T, 2146 PDiag(DiagID) << SelID, CurrentRD); 2147} 2148 2149bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2150 const PartialDiagnostic &PD, 2151 const CXXRecordDecl *CurrentRD) { 2152 if (!getLangOptions().CPlusPlus) 2153 return false; 2154 2155 if (const ArrayType *AT = Context.getAsArrayType(T)) 2156 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2157 CurrentRD); 2158 2159 if (const PointerType *PT = T->getAs<PointerType>()) { 2160 // Find the innermost pointer type. 2161 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2162 PT = T; 2163 2164 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2165 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2166 } 2167 2168 const RecordType *RT = T->getAs<RecordType>(); 2169 if (!RT) 2170 return false; 2171 2172 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2173 2174 if (CurrentRD && CurrentRD != RD) 2175 return false; 2176 2177 // FIXME: is this reasonable? It matches current behavior, but.... 2178 if (!RD->getDefinition()) 2179 return false; 2180 2181 if (!RD->isAbstract()) 2182 return false; 2183 2184 Diag(Loc, PD) << RD->getDeclName(); 2185 2186 // Check if we've already emitted the list of pure virtual functions for this 2187 // class. 2188 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2189 return true; 2190 2191 CXXFinalOverriderMap FinalOverriders; 2192 RD->getFinalOverriders(FinalOverriders); 2193 2194 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2195 MEnd = FinalOverriders.end(); 2196 M != MEnd; 2197 ++M) { 2198 for (OverridingMethods::iterator SO = M->second.begin(), 2199 SOEnd = M->second.end(); 2200 SO != SOEnd; ++SO) { 2201 // C++ [class.abstract]p4: 2202 // A class is abstract if it contains or inherits at least one 2203 // pure virtual function for which the final overrider is pure 2204 // virtual. 2205 2206 // 2207 if (SO->second.size() != 1) 2208 continue; 2209 2210 if (!SO->second.front().Method->isPure()) 2211 continue; 2212 2213 Diag(SO->second.front().Method->getLocation(), 2214 diag::note_pure_virtual_function) 2215 << SO->second.front().Method->getDeclName(); 2216 } 2217 } 2218 2219 if (!PureVirtualClassDiagSet) 2220 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2221 PureVirtualClassDiagSet->insert(RD); 2222 2223 return true; 2224} 2225 2226namespace { 2227 class AbstractClassUsageDiagnoser 2228 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2229 Sema &SemaRef; 2230 CXXRecordDecl *AbstractClass; 2231 2232 bool VisitDeclContext(const DeclContext *DC) { 2233 bool Invalid = false; 2234 2235 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2236 E = DC->decls_end(); I != E; ++I) 2237 Invalid |= Visit(*I); 2238 2239 return Invalid; 2240 } 2241 2242 public: 2243 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2244 : SemaRef(SemaRef), AbstractClass(ac) { 2245 Visit(SemaRef.Context.getTranslationUnitDecl()); 2246 } 2247 2248 bool VisitFunctionDecl(const FunctionDecl *FD) { 2249 if (FD->isThisDeclarationADefinition()) { 2250 // No need to do the check if we're in a definition, because it requires 2251 // that the return/param types are complete. 2252 // because that requires 2253 return VisitDeclContext(FD); 2254 } 2255 2256 // Check the return type. 2257 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2258 bool Invalid = 2259 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2260 diag::err_abstract_type_in_decl, 2261 Sema::AbstractReturnType, 2262 AbstractClass); 2263 2264 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2265 E = FD->param_end(); I != E; ++I) { 2266 const ParmVarDecl *VD = *I; 2267 Invalid |= 2268 SemaRef.RequireNonAbstractType(VD->getLocation(), 2269 VD->getOriginalType(), 2270 diag::err_abstract_type_in_decl, 2271 Sema::AbstractParamType, 2272 AbstractClass); 2273 } 2274 2275 return Invalid; 2276 } 2277 2278 bool VisitDecl(const Decl* D) { 2279 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2280 return VisitDeclContext(DC); 2281 2282 return false; 2283 } 2284 }; 2285} 2286 2287/// \brief Perform semantic checks on a class definition that has been 2288/// completing, introducing implicitly-declared members, checking for 2289/// abstract types, etc. 2290void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2291 if (!Record || Record->isInvalidDecl()) 2292 return; 2293 2294 if (!Record->isDependentType()) 2295 AddImplicitlyDeclaredMembersToClass(S, Record); 2296 2297 if (Record->isInvalidDecl()) 2298 return; 2299 2300 // Set access bits correctly on the directly-declared conversions. 2301 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2302 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2303 Convs->setAccess(I, (*I)->getAccess()); 2304 2305 // Determine whether we need to check for final overriders. We do 2306 // this either when there are virtual base classes (in which case we 2307 // may end up finding multiple final overriders for a given virtual 2308 // function) or any of the base classes is abstract (in which case 2309 // we might detect that this class is abstract). 2310 bool CheckFinalOverriders = false; 2311 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2312 !Record->isDependentType()) { 2313 if (Record->getNumVBases()) 2314 CheckFinalOverriders = true; 2315 else if (!Record->isAbstract()) { 2316 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2317 BEnd = Record->bases_end(); 2318 B != BEnd; ++B) { 2319 CXXRecordDecl *BaseDecl 2320 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2321 if (BaseDecl->isAbstract()) { 2322 CheckFinalOverriders = true; 2323 break; 2324 } 2325 } 2326 } 2327 } 2328 2329 if (CheckFinalOverriders) { 2330 CXXFinalOverriderMap FinalOverriders; 2331 Record->getFinalOverriders(FinalOverriders); 2332 2333 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2334 MEnd = FinalOverriders.end(); 2335 M != MEnd; ++M) { 2336 for (OverridingMethods::iterator SO = M->second.begin(), 2337 SOEnd = M->second.end(); 2338 SO != SOEnd; ++SO) { 2339 assert(SO->second.size() > 0 && 2340 "All virtual functions have overridding virtual functions"); 2341 if (SO->second.size() == 1) { 2342 // C++ [class.abstract]p4: 2343 // A class is abstract if it contains or inherits at least one 2344 // pure virtual function for which the final overrider is pure 2345 // virtual. 2346 if (SO->second.front().Method->isPure()) 2347 Record->setAbstract(true); 2348 continue; 2349 } 2350 2351 // C++ [class.virtual]p2: 2352 // In a derived class, if a virtual member function of a base 2353 // class subobject has more than one final overrider the 2354 // program is ill-formed. 2355 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2356 << (NamedDecl *)M->first << Record; 2357 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2358 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2359 OMEnd = SO->second.end(); 2360 OM != OMEnd; ++OM) 2361 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2362 << (NamedDecl *)M->first << OM->Method->getParent(); 2363 2364 Record->setInvalidDecl(); 2365 } 2366 } 2367 } 2368 2369 if (Record->isAbstract() && !Record->isInvalidDecl()) 2370 (void)AbstractClassUsageDiagnoser(*this, Record); 2371 2372 // If this is not an aggregate type and has no user-declared constructor, 2373 // complain about any non-static data members of reference or const scalar 2374 // type, since they will never get initializers. 2375 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2376 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2377 bool Complained = false; 2378 for (RecordDecl::field_iterator F = Record->field_begin(), 2379 FEnd = Record->field_end(); 2380 F != FEnd; ++F) { 2381 if (F->getType()->isReferenceType() || 2382 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2383 if (!Complained) { 2384 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2385 << Record->getTagKind() << Record; 2386 Complained = true; 2387 } 2388 2389 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2390 << F->getType()->isReferenceType() 2391 << F->getDeclName(); 2392 } 2393 } 2394 } 2395} 2396 2397void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2398 DeclPtrTy TagDecl, 2399 SourceLocation LBrac, 2400 SourceLocation RBrac, 2401 AttributeList *AttrList) { 2402 if (!TagDecl) 2403 return; 2404 2405 AdjustDeclIfTemplate(TagDecl); 2406 2407 ActOnFields(S, RLoc, TagDecl, 2408 (DeclPtrTy*)FieldCollector->getCurFields(), 2409 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2410 2411 CheckCompletedCXXClass(S, 2412 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2413} 2414 2415/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2416/// special functions, such as the default constructor, copy 2417/// constructor, or destructor, to the given C++ class (C++ 2418/// [special]p1). This routine can only be executed just before the 2419/// definition of the class is complete. 2420/// 2421/// The scope, if provided, is the class scope. 2422void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2423 CXXRecordDecl *ClassDecl) { 2424 CanQualType ClassType 2425 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2426 2427 // FIXME: Implicit declarations have exception specifications, which are 2428 // the union of the specifications of the implicitly called functions. 2429 2430 if (!ClassDecl->hasUserDeclaredConstructor()) { 2431 // C++ [class.ctor]p5: 2432 // A default constructor for a class X is a constructor of class X 2433 // that can be called without an argument. If there is no 2434 // user-declared constructor for class X, a default constructor is 2435 // implicitly declared. An implicitly-declared default constructor 2436 // is an inline public member of its class. 2437 DeclarationName Name 2438 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2439 CXXConstructorDecl *DefaultCon = 2440 CXXConstructorDecl::Create(Context, ClassDecl, 2441 ClassDecl->getLocation(), Name, 2442 Context.getFunctionType(Context.VoidTy, 2443 0, 0, false, 0, 2444 /*FIXME*/false, false, 2445 0, 0, 2446 FunctionType::ExtInfo()), 2447 /*TInfo=*/0, 2448 /*isExplicit=*/false, 2449 /*isInline=*/true, 2450 /*isImplicitlyDeclared=*/true); 2451 DefaultCon->setAccess(AS_public); 2452 DefaultCon->setImplicit(); 2453 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2454 if (S) 2455 PushOnScopeChains(DefaultCon, S, true); 2456 else 2457 ClassDecl->addDecl(DefaultCon); 2458 } 2459 2460 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2461 // C++ [class.copy]p4: 2462 // If the class definition does not explicitly declare a copy 2463 // constructor, one is declared implicitly. 2464 2465 // C++ [class.copy]p5: 2466 // The implicitly-declared copy constructor for a class X will 2467 // have the form 2468 // 2469 // X::X(const X&) 2470 // 2471 // if 2472 bool HasConstCopyConstructor = true; 2473 2474 // -- each direct or virtual base class B of X has a copy 2475 // constructor whose first parameter is of type const B& or 2476 // const volatile B&, and 2477 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2478 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2479 const CXXRecordDecl *BaseClassDecl 2480 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2481 HasConstCopyConstructor 2482 = BaseClassDecl->hasConstCopyConstructor(Context); 2483 } 2484 2485 // -- for all the nonstatic data members of X that are of a 2486 // class type M (or array thereof), each such class type 2487 // has a copy constructor whose first parameter is of type 2488 // const M& or const volatile M&. 2489 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2490 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2491 ++Field) { 2492 QualType FieldType = (*Field)->getType(); 2493 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2494 FieldType = Array->getElementType(); 2495 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2496 const CXXRecordDecl *FieldClassDecl 2497 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2498 HasConstCopyConstructor 2499 = FieldClassDecl->hasConstCopyConstructor(Context); 2500 } 2501 } 2502 2503 // Otherwise, the implicitly declared copy constructor will have 2504 // the form 2505 // 2506 // X::X(X&) 2507 QualType ArgType = ClassType; 2508 if (HasConstCopyConstructor) 2509 ArgType = ArgType.withConst(); 2510 ArgType = Context.getLValueReferenceType(ArgType); 2511 2512 // An implicitly-declared copy constructor is an inline public 2513 // member of its class. 2514 DeclarationName Name 2515 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2516 CXXConstructorDecl *CopyConstructor 2517 = CXXConstructorDecl::Create(Context, ClassDecl, 2518 ClassDecl->getLocation(), Name, 2519 Context.getFunctionType(Context.VoidTy, 2520 &ArgType, 1, 2521 false, 0, 2522 /*FIXME:*/false, 2523 false, 0, 0, 2524 FunctionType::ExtInfo()), 2525 /*TInfo=*/0, 2526 /*isExplicit=*/false, 2527 /*isInline=*/true, 2528 /*isImplicitlyDeclared=*/true); 2529 CopyConstructor->setAccess(AS_public); 2530 CopyConstructor->setImplicit(); 2531 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2532 2533 // Add the parameter to the constructor. 2534 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2535 ClassDecl->getLocation(), 2536 /*IdentifierInfo=*/0, 2537 ArgType, /*TInfo=*/0, 2538 VarDecl::None, 2539 VarDecl::None, 0); 2540 CopyConstructor->setParams(&FromParam, 1); 2541 if (S) 2542 PushOnScopeChains(CopyConstructor, S, true); 2543 else 2544 ClassDecl->addDecl(CopyConstructor); 2545 } 2546 2547 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2548 // Note: The following rules are largely analoguous to the copy 2549 // constructor rules. Note that virtual bases are not taken into account 2550 // for determining the argument type of the operator. Note also that 2551 // operators taking an object instead of a reference are allowed. 2552 // 2553 // C++ [class.copy]p10: 2554 // If the class definition does not explicitly declare a copy 2555 // assignment operator, one is declared implicitly. 2556 // The implicitly-defined copy assignment operator for a class X 2557 // will have the form 2558 // 2559 // X& X::operator=(const X&) 2560 // 2561 // if 2562 bool HasConstCopyAssignment = true; 2563 2564 // -- each direct base class B of X has a copy assignment operator 2565 // whose parameter is of type const B&, const volatile B& or B, 2566 // and 2567 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2568 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2569 assert(!Base->getType()->isDependentType() && 2570 "Cannot generate implicit members for class with dependent bases."); 2571 const CXXRecordDecl *BaseClassDecl 2572 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2573 const CXXMethodDecl *MD = 0; 2574 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2575 MD); 2576 } 2577 2578 // -- for all the nonstatic data members of X that are of a class 2579 // type M (or array thereof), each such class type has a copy 2580 // assignment operator whose parameter is of type const M&, 2581 // const volatile M& or M. 2582 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2583 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2584 ++Field) { 2585 QualType FieldType = (*Field)->getType(); 2586 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2587 FieldType = Array->getElementType(); 2588 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2589 const CXXRecordDecl *FieldClassDecl 2590 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2591 const CXXMethodDecl *MD = 0; 2592 HasConstCopyAssignment 2593 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2594 } 2595 } 2596 2597 // Otherwise, the implicitly declared copy assignment operator will 2598 // have the form 2599 // 2600 // X& X::operator=(X&) 2601 QualType ArgType = ClassType; 2602 QualType RetType = Context.getLValueReferenceType(ArgType); 2603 if (HasConstCopyAssignment) 2604 ArgType = ArgType.withConst(); 2605 ArgType = Context.getLValueReferenceType(ArgType); 2606 2607 // An implicitly-declared copy assignment operator is an inline public 2608 // member of its class. 2609 DeclarationName Name = 2610 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2611 CXXMethodDecl *CopyAssignment = 2612 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2613 Context.getFunctionType(RetType, &ArgType, 1, 2614 false, 0, 2615 /*FIXME:*/false, 2616 false, 0, 0, 2617 FunctionType::ExtInfo()), 2618 /*TInfo=*/0, /*isStatic=*/false, 2619 /*StorageClassAsWritten=*/FunctionDecl::None, 2620 /*isInline=*/true); 2621 CopyAssignment->setAccess(AS_public); 2622 CopyAssignment->setImplicit(); 2623 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2624 CopyAssignment->setCopyAssignment(true); 2625 2626 // Add the parameter to the operator. 2627 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2628 ClassDecl->getLocation(), 2629 /*IdentifierInfo=*/0, 2630 ArgType, /*TInfo=*/0, 2631 VarDecl::None, 2632 VarDecl::None, 0); 2633 CopyAssignment->setParams(&FromParam, 1); 2634 2635 // Don't call addedAssignmentOperator. There is no way to distinguish an 2636 // implicit from an explicit assignment operator. 2637 if (S) 2638 PushOnScopeChains(CopyAssignment, S, true); 2639 else 2640 ClassDecl->addDecl(CopyAssignment); 2641 AddOverriddenMethods(ClassDecl, CopyAssignment); 2642 } 2643 2644 if (!ClassDecl->hasUserDeclaredDestructor()) { 2645 // C++ [class.dtor]p2: 2646 // If a class has no user-declared destructor, a destructor is 2647 // declared implicitly. An implicitly-declared destructor is an 2648 // inline public member of its class. 2649 QualType Ty = Context.getFunctionType(Context.VoidTy, 2650 0, 0, false, 0, 2651 /*FIXME:*/false, 2652 false, 0, 0, FunctionType::ExtInfo()); 2653 2654 DeclarationName Name 2655 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2656 CXXDestructorDecl *Destructor 2657 = CXXDestructorDecl::Create(Context, ClassDecl, 2658 ClassDecl->getLocation(), Name, Ty, 2659 /*isInline=*/true, 2660 /*isImplicitlyDeclared=*/true); 2661 Destructor->setAccess(AS_public); 2662 Destructor->setImplicit(); 2663 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2664 if (S) 2665 PushOnScopeChains(Destructor, S, true); 2666 else 2667 ClassDecl->addDecl(Destructor); 2668 2669 // This could be uniqued if it ever proves significant. 2670 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2671 2672 AddOverriddenMethods(ClassDecl, Destructor); 2673 } 2674} 2675 2676void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2677 Decl *D = TemplateD.getAs<Decl>(); 2678 if (!D) 2679 return; 2680 2681 TemplateParameterList *Params = 0; 2682 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2683 Params = Template->getTemplateParameters(); 2684 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2685 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2686 Params = PartialSpec->getTemplateParameters(); 2687 else 2688 return; 2689 2690 for (TemplateParameterList::iterator Param = Params->begin(), 2691 ParamEnd = Params->end(); 2692 Param != ParamEnd; ++Param) { 2693 NamedDecl *Named = cast<NamedDecl>(*Param); 2694 if (Named->getDeclName()) { 2695 S->AddDecl(DeclPtrTy::make(Named)); 2696 IdResolver.AddDecl(Named); 2697 } 2698 } 2699} 2700 2701void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2702 if (!RecordD) return; 2703 AdjustDeclIfTemplate(RecordD); 2704 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2705 PushDeclContext(S, Record); 2706} 2707 2708void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2709 if (!RecordD) return; 2710 PopDeclContext(); 2711} 2712 2713/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2714/// parsing a top-level (non-nested) C++ class, and we are now 2715/// parsing those parts of the given Method declaration that could 2716/// not be parsed earlier (C++ [class.mem]p2), such as default 2717/// arguments. This action should enter the scope of the given 2718/// Method declaration as if we had just parsed the qualified method 2719/// name. However, it should not bring the parameters into scope; 2720/// that will be performed by ActOnDelayedCXXMethodParameter. 2721void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2722} 2723 2724/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2725/// C++ method declaration. We're (re-)introducing the given 2726/// function parameter into scope for use in parsing later parts of 2727/// the method declaration. For example, we could see an 2728/// ActOnParamDefaultArgument event for this parameter. 2729void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2730 if (!ParamD) 2731 return; 2732 2733 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2734 2735 // If this parameter has an unparsed default argument, clear it out 2736 // to make way for the parsed default argument. 2737 if (Param->hasUnparsedDefaultArg()) 2738 Param->setDefaultArg(0); 2739 2740 S->AddDecl(DeclPtrTy::make(Param)); 2741 if (Param->getDeclName()) 2742 IdResolver.AddDecl(Param); 2743} 2744 2745/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2746/// processing the delayed method declaration for Method. The method 2747/// declaration is now considered finished. There may be a separate 2748/// ActOnStartOfFunctionDef action later (not necessarily 2749/// immediately!) for this method, if it was also defined inside the 2750/// class body. 2751void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2752 if (!MethodD) 2753 return; 2754 2755 AdjustDeclIfTemplate(MethodD); 2756 2757 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2758 2759 // Now that we have our default arguments, check the constructor 2760 // again. It could produce additional diagnostics or affect whether 2761 // the class has implicitly-declared destructors, among other 2762 // things. 2763 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2764 CheckConstructor(Constructor); 2765 2766 // Check the default arguments, which we may have added. 2767 if (!Method->isInvalidDecl()) 2768 CheckCXXDefaultArguments(Method); 2769} 2770 2771/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2772/// the well-formedness of the constructor declarator @p D with type @p 2773/// R. If there are any errors in the declarator, this routine will 2774/// emit diagnostics and set the invalid bit to true. In any case, the type 2775/// will be updated to reflect a well-formed type for the constructor and 2776/// returned. 2777QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2778 FunctionDecl::StorageClass &SC) { 2779 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2780 2781 // C++ [class.ctor]p3: 2782 // A constructor shall not be virtual (10.3) or static (9.4). A 2783 // constructor can be invoked for a const, volatile or const 2784 // volatile object. A constructor shall not be declared const, 2785 // volatile, or const volatile (9.3.2). 2786 if (isVirtual) { 2787 if (!D.isInvalidType()) 2788 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2789 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2790 << SourceRange(D.getIdentifierLoc()); 2791 D.setInvalidType(); 2792 } 2793 if (SC == FunctionDecl::Static) { 2794 if (!D.isInvalidType()) 2795 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2796 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2797 << SourceRange(D.getIdentifierLoc()); 2798 D.setInvalidType(); 2799 SC = FunctionDecl::None; 2800 } 2801 2802 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2803 if (FTI.TypeQuals != 0) { 2804 if (FTI.TypeQuals & Qualifiers::Const) 2805 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2806 << "const" << SourceRange(D.getIdentifierLoc()); 2807 if (FTI.TypeQuals & Qualifiers::Volatile) 2808 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2809 << "volatile" << SourceRange(D.getIdentifierLoc()); 2810 if (FTI.TypeQuals & Qualifiers::Restrict) 2811 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2812 << "restrict" << SourceRange(D.getIdentifierLoc()); 2813 } 2814 2815 // Rebuild the function type "R" without any type qualifiers (in 2816 // case any of the errors above fired) and with "void" as the 2817 // return type, since constructors don't have return types. We 2818 // *always* have to do this, because GetTypeForDeclarator will 2819 // put in a result type of "int" when none was specified. 2820 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2821 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2822 Proto->getNumArgs(), 2823 Proto->isVariadic(), 0, 2824 Proto->hasExceptionSpec(), 2825 Proto->hasAnyExceptionSpec(), 2826 Proto->getNumExceptions(), 2827 Proto->exception_begin(), 2828 Proto->getExtInfo()); 2829} 2830 2831/// CheckConstructor - Checks a fully-formed constructor for 2832/// well-formedness, issuing any diagnostics required. Returns true if 2833/// the constructor declarator is invalid. 2834void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2835 CXXRecordDecl *ClassDecl 2836 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2837 if (!ClassDecl) 2838 return Constructor->setInvalidDecl(); 2839 2840 // C++ [class.copy]p3: 2841 // A declaration of a constructor for a class X is ill-formed if 2842 // its first parameter is of type (optionally cv-qualified) X and 2843 // either there are no other parameters or else all other 2844 // parameters have default arguments. 2845 if (!Constructor->isInvalidDecl() && 2846 ((Constructor->getNumParams() == 1) || 2847 (Constructor->getNumParams() > 1 && 2848 Constructor->getParamDecl(1)->hasDefaultArg())) && 2849 Constructor->getTemplateSpecializationKind() 2850 != TSK_ImplicitInstantiation) { 2851 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2852 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2853 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2854 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2855 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2856 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2857 2858 // FIXME: Rather that making the constructor invalid, we should endeavor 2859 // to fix the type. 2860 Constructor->setInvalidDecl(); 2861 } 2862 } 2863 2864 // Notify the class that we've added a constructor. In principle we 2865 // don't need to do this for out-of-line declarations; in practice 2866 // we only instantiate the most recent declaration of a method, so 2867 // we have to call this for everything but friends. 2868 if (!Constructor->getFriendObjectKind()) 2869 ClassDecl->addedConstructor(Context, Constructor); 2870} 2871 2872/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2873/// issuing any diagnostics required. Returns true on error. 2874bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2875 CXXRecordDecl *RD = Destructor->getParent(); 2876 2877 if (Destructor->isVirtual()) { 2878 SourceLocation Loc; 2879 2880 if (!Destructor->isImplicit()) 2881 Loc = Destructor->getLocation(); 2882 else 2883 Loc = RD->getLocation(); 2884 2885 // If we have a virtual destructor, look up the deallocation function 2886 FunctionDecl *OperatorDelete = 0; 2887 DeclarationName Name = 2888 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2889 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2890 return true; 2891 2892 Destructor->setOperatorDelete(OperatorDelete); 2893 } 2894 2895 return false; 2896} 2897 2898static inline bool 2899FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2900 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2901 FTI.ArgInfo[0].Param && 2902 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2903} 2904 2905/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2906/// the well-formednes of the destructor declarator @p D with type @p 2907/// R. If there are any errors in the declarator, this routine will 2908/// emit diagnostics and set the declarator to invalid. Even if this happens, 2909/// will be updated to reflect a well-formed type for the destructor and 2910/// returned. 2911QualType Sema::CheckDestructorDeclarator(Declarator &D, 2912 FunctionDecl::StorageClass& SC) { 2913 // C++ [class.dtor]p1: 2914 // [...] A typedef-name that names a class is a class-name 2915 // (7.1.3); however, a typedef-name that names a class shall not 2916 // be used as the identifier in the declarator for a destructor 2917 // declaration. 2918 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2919 if (isa<TypedefType>(DeclaratorType)) { 2920 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2921 << DeclaratorType; 2922 D.setInvalidType(); 2923 } 2924 2925 // C++ [class.dtor]p2: 2926 // A destructor is used to destroy objects of its class type. A 2927 // destructor takes no parameters, and no return type can be 2928 // specified for it (not even void). The address of a destructor 2929 // shall not be taken. A destructor shall not be static. A 2930 // destructor can be invoked for a const, volatile or const 2931 // volatile object. A destructor shall not be declared const, 2932 // volatile or const volatile (9.3.2). 2933 if (SC == FunctionDecl::Static) { 2934 if (!D.isInvalidType()) 2935 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2936 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2937 << SourceRange(D.getIdentifierLoc()); 2938 SC = FunctionDecl::None; 2939 D.setInvalidType(); 2940 } 2941 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2942 // Destructors don't have return types, but the parser will 2943 // happily parse something like: 2944 // 2945 // class X { 2946 // float ~X(); 2947 // }; 2948 // 2949 // The return type will be eliminated later. 2950 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2951 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2952 << SourceRange(D.getIdentifierLoc()); 2953 } 2954 2955 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2956 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2957 if (FTI.TypeQuals & Qualifiers::Const) 2958 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2959 << "const" << SourceRange(D.getIdentifierLoc()); 2960 if (FTI.TypeQuals & Qualifiers::Volatile) 2961 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2962 << "volatile" << SourceRange(D.getIdentifierLoc()); 2963 if (FTI.TypeQuals & Qualifiers::Restrict) 2964 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2965 << "restrict" << SourceRange(D.getIdentifierLoc()); 2966 D.setInvalidType(); 2967 } 2968 2969 // Make sure we don't have any parameters. 2970 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2971 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2972 2973 // Delete the parameters. 2974 FTI.freeArgs(); 2975 D.setInvalidType(); 2976 } 2977 2978 // Make sure the destructor isn't variadic. 2979 if (FTI.isVariadic) { 2980 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2981 D.setInvalidType(); 2982 } 2983 2984 // Rebuild the function type "R" without any type qualifiers or 2985 // parameters (in case any of the errors above fired) and with 2986 // "void" as the return type, since destructors don't have return 2987 // types. We *always* have to do this, because GetTypeForDeclarator 2988 // will put in a result type of "int" when none was specified. 2989 // FIXME: Exceptions! 2990 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2991 false, false, 0, 0, FunctionType::ExtInfo()); 2992} 2993 2994/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2995/// well-formednes of the conversion function declarator @p D with 2996/// type @p R. If there are any errors in the declarator, this routine 2997/// will emit diagnostics and return true. Otherwise, it will return 2998/// false. Either way, the type @p R will be updated to reflect a 2999/// well-formed type for the conversion operator. 3000void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3001 FunctionDecl::StorageClass& SC) { 3002 // C++ [class.conv.fct]p1: 3003 // Neither parameter types nor return type can be specified. The 3004 // type of a conversion function (8.3.5) is "function taking no 3005 // parameter returning conversion-type-id." 3006 if (SC == FunctionDecl::Static) { 3007 if (!D.isInvalidType()) 3008 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3009 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3010 << SourceRange(D.getIdentifierLoc()); 3011 D.setInvalidType(); 3012 SC = FunctionDecl::None; 3013 } 3014 3015 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3016 3017 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3018 // Conversion functions don't have return types, but the parser will 3019 // happily parse something like: 3020 // 3021 // class X { 3022 // float operator bool(); 3023 // }; 3024 // 3025 // The return type will be changed later anyway. 3026 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3027 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3028 << SourceRange(D.getIdentifierLoc()); 3029 D.setInvalidType(); 3030 } 3031 3032 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3033 3034 // Make sure we don't have any parameters. 3035 if (Proto->getNumArgs() > 0) { 3036 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3037 3038 // Delete the parameters. 3039 D.getTypeObject(0).Fun.freeArgs(); 3040 D.setInvalidType(); 3041 } else if (Proto->isVariadic()) { 3042 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3043 D.setInvalidType(); 3044 } 3045 3046 // Diagnose "&operator bool()" and other such nonsense. This 3047 // is actually a gcc extension which we don't support. 3048 if (Proto->getResultType() != ConvType) { 3049 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3050 << Proto->getResultType(); 3051 D.setInvalidType(); 3052 ConvType = Proto->getResultType(); 3053 } 3054 3055 // C++ [class.conv.fct]p4: 3056 // The conversion-type-id shall not represent a function type nor 3057 // an array type. 3058 if (ConvType->isArrayType()) { 3059 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3060 ConvType = Context.getPointerType(ConvType); 3061 D.setInvalidType(); 3062 } else if (ConvType->isFunctionType()) { 3063 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3064 ConvType = Context.getPointerType(ConvType); 3065 D.setInvalidType(); 3066 } 3067 3068 // Rebuild the function type "R" without any parameters (in case any 3069 // of the errors above fired) and with the conversion type as the 3070 // return type. 3071 if (D.isInvalidType()) { 3072 R = Context.getFunctionType(ConvType, 0, 0, false, 3073 Proto->getTypeQuals(), 3074 Proto->hasExceptionSpec(), 3075 Proto->hasAnyExceptionSpec(), 3076 Proto->getNumExceptions(), 3077 Proto->exception_begin(), 3078 Proto->getExtInfo()); 3079 } 3080 3081 // C++0x explicit conversion operators. 3082 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3083 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3084 diag::warn_explicit_conversion_functions) 3085 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3086} 3087 3088/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3089/// the declaration of the given C++ conversion function. This routine 3090/// is responsible for recording the conversion function in the C++ 3091/// class, if possible. 3092Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3093 assert(Conversion && "Expected to receive a conversion function declaration"); 3094 3095 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3096 3097 // Make sure we aren't redeclaring the conversion function. 3098 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3099 3100 // C++ [class.conv.fct]p1: 3101 // [...] A conversion function is never used to convert a 3102 // (possibly cv-qualified) object to the (possibly cv-qualified) 3103 // same object type (or a reference to it), to a (possibly 3104 // cv-qualified) base class of that type (or a reference to it), 3105 // or to (possibly cv-qualified) void. 3106 // FIXME: Suppress this warning if the conversion function ends up being a 3107 // virtual function that overrides a virtual function in a base class. 3108 QualType ClassType 3109 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3110 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3111 ConvType = ConvTypeRef->getPointeeType(); 3112 if (ConvType->isRecordType()) { 3113 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3114 if (ConvType == ClassType) 3115 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3116 << ClassType; 3117 else if (IsDerivedFrom(ClassType, ConvType)) 3118 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3119 << ClassType << ConvType; 3120 } else if (ConvType->isVoidType()) { 3121 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3122 << ClassType << ConvType; 3123 } 3124 3125 if (Conversion->getPrimaryTemplate()) { 3126 // ignore specializations 3127 } else if (Conversion->getPreviousDeclaration()) { 3128 if (FunctionTemplateDecl *ConversionTemplate 3129 = Conversion->getDescribedFunctionTemplate()) { 3130 if (ClassDecl->replaceConversion( 3131 ConversionTemplate->getPreviousDeclaration(), 3132 ConversionTemplate)) 3133 return DeclPtrTy::make(ConversionTemplate); 3134 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3135 Conversion)) 3136 return DeclPtrTy::make(Conversion); 3137 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3138 } else if (FunctionTemplateDecl *ConversionTemplate 3139 = Conversion->getDescribedFunctionTemplate()) 3140 ClassDecl->addConversionFunction(ConversionTemplate); 3141 else 3142 ClassDecl->addConversionFunction(Conversion); 3143 3144 return DeclPtrTy::make(Conversion); 3145} 3146 3147//===----------------------------------------------------------------------===// 3148// Namespace Handling 3149//===----------------------------------------------------------------------===// 3150 3151/// ActOnStartNamespaceDef - This is called at the start of a namespace 3152/// definition. 3153Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3154 SourceLocation IdentLoc, 3155 IdentifierInfo *II, 3156 SourceLocation LBrace, 3157 AttributeList *AttrList) { 3158 NamespaceDecl *Namespc = 3159 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3160 Namespc->setLBracLoc(LBrace); 3161 3162 Scope *DeclRegionScope = NamespcScope->getParent(); 3163 3164 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3165 3166 if (II) { 3167 // C++ [namespace.def]p2: 3168 // The identifier in an original-namespace-definition shall not have been 3169 // previously defined in the declarative region in which the 3170 // original-namespace-definition appears. The identifier in an 3171 // original-namespace-definition is the name of the namespace. Subsequently 3172 // in that declarative region, it is treated as an original-namespace-name. 3173 3174 NamedDecl *PrevDecl 3175 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3176 ForRedeclaration); 3177 3178 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3179 // This is an extended namespace definition. 3180 // Attach this namespace decl to the chain of extended namespace 3181 // definitions. 3182 OrigNS->setNextNamespace(Namespc); 3183 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3184 3185 // Remove the previous declaration from the scope. 3186 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3187 IdResolver.RemoveDecl(OrigNS); 3188 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3189 } 3190 } else if (PrevDecl) { 3191 // This is an invalid name redefinition. 3192 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3193 << Namespc->getDeclName(); 3194 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3195 Namespc->setInvalidDecl(); 3196 // Continue on to push Namespc as current DeclContext and return it. 3197 } else if (II->isStr("std") && 3198 CurContext->getLookupContext()->isTranslationUnit()) { 3199 // This is the first "real" definition of the namespace "std", so update 3200 // our cache of the "std" namespace to point at this definition. 3201 if (StdNamespace) { 3202 // We had already defined a dummy namespace "std". Link this new 3203 // namespace definition to the dummy namespace "std". 3204 StdNamespace->setNextNamespace(Namespc); 3205 StdNamespace->setLocation(IdentLoc); 3206 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3207 } 3208 3209 // Make our StdNamespace cache point at the first real definition of the 3210 // "std" namespace. 3211 StdNamespace = Namespc; 3212 } 3213 3214 PushOnScopeChains(Namespc, DeclRegionScope); 3215 } else { 3216 // Anonymous namespaces. 3217 assert(Namespc->isAnonymousNamespace()); 3218 3219 // Link the anonymous namespace into its parent. 3220 NamespaceDecl *PrevDecl; 3221 DeclContext *Parent = CurContext->getLookupContext(); 3222 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3223 PrevDecl = TU->getAnonymousNamespace(); 3224 TU->setAnonymousNamespace(Namespc); 3225 } else { 3226 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3227 PrevDecl = ND->getAnonymousNamespace(); 3228 ND->setAnonymousNamespace(Namespc); 3229 } 3230 3231 // Link the anonymous namespace with its previous declaration. 3232 if (PrevDecl) { 3233 assert(PrevDecl->isAnonymousNamespace()); 3234 assert(!PrevDecl->getNextNamespace()); 3235 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3236 PrevDecl->setNextNamespace(Namespc); 3237 } 3238 3239 CurContext->addDecl(Namespc); 3240 3241 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3242 // behaves as if it were replaced by 3243 // namespace unique { /* empty body */ } 3244 // using namespace unique; 3245 // namespace unique { namespace-body } 3246 // where all occurrences of 'unique' in a translation unit are 3247 // replaced by the same identifier and this identifier differs 3248 // from all other identifiers in the entire program. 3249 3250 // We just create the namespace with an empty name and then add an 3251 // implicit using declaration, just like the standard suggests. 3252 // 3253 // CodeGen enforces the "universally unique" aspect by giving all 3254 // declarations semantically contained within an anonymous 3255 // namespace internal linkage. 3256 3257 if (!PrevDecl) { 3258 UsingDirectiveDecl* UD 3259 = UsingDirectiveDecl::Create(Context, CurContext, 3260 /* 'using' */ LBrace, 3261 /* 'namespace' */ SourceLocation(), 3262 /* qualifier */ SourceRange(), 3263 /* NNS */ NULL, 3264 /* identifier */ SourceLocation(), 3265 Namespc, 3266 /* Ancestor */ CurContext); 3267 UD->setImplicit(); 3268 CurContext->addDecl(UD); 3269 } 3270 } 3271 3272 // Although we could have an invalid decl (i.e. the namespace name is a 3273 // redefinition), push it as current DeclContext and try to continue parsing. 3274 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3275 // for the namespace has the declarations that showed up in that particular 3276 // namespace definition. 3277 PushDeclContext(NamespcScope, Namespc); 3278 return DeclPtrTy::make(Namespc); 3279} 3280 3281/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3282/// is a namespace alias, returns the namespace it points to. 3283static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3284 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3285 return AD->getNamespace(); 3286 return dyn_cast_or_null<NamespaceDecl>(D); 3287} 3288 3289/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3290/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3291void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3292 Decl *Dcl = D.getAs<Decl>(); 3293 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3294 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3295 Namespc->setRBracLoc(RBrace); 3296 PopDeclContext(); 3297} 3298 3299Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3300 SourceLocation UsingLoc, 3301 SourceLocation NamespcLoc, 3302 CXXScopeSpec &SS, 3303 SourceLocation IdentLoc, 3304 IdentifierInfo *NamespcName, 3305 AttributeList *AttrList) { 3306 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3307 assert(NamespcName && "Invalid NamespcName."); 3308 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3309 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3310 3311 UsingDirectiveDecl *UDir = 0; 3312 3313 // Lookup namespace name. 3314 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3315 LookupParsedName(R, S, &SS); 3316 if (R.isAmbiguous()) 3317 return DeclPtrTy(); 3318 3319 if (!R.empty()) { 3320 NamedDecl *Named = R.getFoundDecl(); 3321 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3322 && "expected namespace decl"); 3323 // C++ [namespace.udir]p1: 3324 // A using-directive specifies that the names in the nominated 3325 // namespace can be used in the scope in which the 3326 // using-directive appears after the using-directive. During 3327 // unqualified name lookup (3.4.1), the names appear as if they 3328 // were declared in the nearest enclosing namespace which 3329 // contains both the using-directive and the nominated 3330 // namespace. [Note: in this context, "contains" means "contains 3331 // directly or indirectly". ] 3332 3333 // Find enclosing context containing both using-directive and 3334 // nominated namespace. 3335 NamespaceDecl *NS = getNamespaceDecl(Named); 3336 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3337 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3338 CommonAncestor = CommonAncestor->getParent(); 3339 3340 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3341 SS.getRange(), 3342 (NestedNameSpecifier *)SS.getScopeRep(), 3343 IdentLoc, Named, CommonAncestor); 3344 PushUsingDirective(S, UDir); 3345 } else { 3346 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3347 } 3348 3349 // FIXME: We ignore attributes for now. 3350 delete AttrList; 3351 return DeclPtrTy::make(UDir); 3352} 3353 3354void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3355 // If scope has associated entity, then using directive is at namespace 3356 // or translation unit scope. We add UsingDirectiveDecls, into 3357 // it's lookup structure. 3358 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3359 Ctx->addDecl(UDir); 3360 else 3361 // Otherwise it is block-sope. using-directives will affect lookup 3362 // only to the end of scope. 3363 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3364} 3365 3366 3367Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3368 AccessSpecifier AS, 3369 bool HasUsingKeyword, 3370 SourceLocation UsingLoc, 3371 CXXScopeSpec &SS, 3372 UnqualifiedId &Name, 3373 AttributeList *AttrList, 3374 bool IsTypeName, 3375 SourceLocation TypenameLoc) { 3376 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3377 3378 switch (Name.getKind()) { 3379 case UnqualifiedId::IK_Identifier: 3380 case UnqualifiedId::IK_OperatorFunctionId: 3381 case UnqualifiedId::IK_LiteralOperatorId: 3382 case UnqualifiedId::IK_ConversionFunctionId: 3383 break; 3384 3385 case UnqualifiedId::IK_ConstructorName: 3386 case UnqualifiedId::IK_ConstructorTemplateId: 3387 // C++0x inherited constructors. 3388 if (getLangOptions().CPlusPlus0x) break; 3389 3390 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3391 << SS.getRange(); 3392 return DeclPtrTy(); 3393 3394 case UnqualifiedId::IK_DestructorName: 3395 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3396 << SS.getRange(); 3397 return DeclPtrTy(); 3398 3399 case UnqualifiedId::IK_TemplateId: 3400 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3401 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3402 return DeclPtrTy(); 3403 } 3404 3405 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3406 if (!TargetName) 3407 return DeclPtrTy(); 3408 3409 // Warn about using declarations. 3410 // TODO: store that the declaration was written without 'using' and 3411 // talk about access decls instead of using decls in the 3412 // diagnostics. 3413 if (!HasUsingKeyword) { 3414 UsingLoc = Name.getSourceRange().getBegin(); 3415 3416 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3417 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3418 } 3419 3420 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3421 Name.getSourceRange().getBegin(), 3422 TargetName, AttrList, 3423 /* IsInstantiation */ false, 3424 IsTypeName, TypenameLoc); 3425 if (UD) 3426 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3427 3428 return DeclPtrTy::make(UD); 3429} 3430 3431/// Determines whether to create a using shadow decl for a particular 3432/// decl, given the set of decls existing prior to this using lookup. 3433bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3434 const LookupResult &Previous) { 3435 // Diagnose finding a decl which is not from a base class of the 3436 // current class. We do this now because there are cases where this 3437 // function will silently decide not to build a shadow decl, which 3438 // will pre-empt further diagnostics. 3439 // 3440 // We don't need to do this in C++0x because we do the check once on 3441 // the qualifier. 3442 // 3443 // FIXME: diagnose the following if we care enough: 3444 // struct A { int foo; }; 3445 // struct B : A { using A::foo; }; 3446 // template <class T> struct C : A {}; 3447 // template <class T> struct D : C<T> { using B::foo; } // <--- 3448 // This is invalid (during instantiation) in C++03 because B::foo 3449 // resolves to the using decl in B, which is not a base class of D<T>. 3450 // We can't diagnose it immediately because C<T> is an unknown 3451 // specialization. The UsingShadowDecl in D<T> then points directly 3452 // to A::foo, which will look well-formed when we instantiate. 3453 // The right solution is to not collapse the shadow-decl chain. 3454 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3455 DeclContext *OrigDC = Orig->getDeclContext(); 3456 3457 // Handle enums and anonymous structs. 3458 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3459 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3460 while (OrigRec->isAnonymousStructOrUnion()) 3461 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3462 3463 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3464 if (OrigDC == CurContext) { 3465 Diag(Using->getLocation(), 3466 diag::err_using_decl_nested_name_specifier_is_current_class) 3467 << Using->getNestedNameRange(); 3468 Diag(Orig->getLocation(), diag::note_using_decl_target); 3469 return true; 3470 } 3471 3472 Diag(Using->getNestedNameRange().getBegin(), 3473 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3474 << Using->getTargetNestedNameDecl() 3475 << cast<CXXRecordDecl>(CurContext) 3476 << Using->getNestedNameRange(); 3477 Diag(Orig->getLocation(), diag::note_using_decl_target); 3478 return true; 3479 } 3480 } 3481 3482 if (Previous.empty()) return false; 3483 3484 NamedDecl *Target = Orig; 3485 if (isa<UsingShadowDecl>(Target)) 3486 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3487 3488 // If the target happens to be one of the previous declarations, we 3489 // don't have a conflict. 3490 // 3491 // FIXME: but we might be increasing its access, in which case we 3492 // should redeclare it. 3493 NamedDecl *NonTag = 0, *Tag = 0; 3494 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3495 I != E; ++I) { 3496 NamedDecl *D = (*I)->getUnderlyingDecl(); 3497 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3498 return false; 3499 3500 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3501 } 3502 3503 if (Target->isFunctionOrFunctionTemplate()) { 3504 FunctionDecl *FD; 3505 if (isa<FunctionTemplateDecl>(Target)) 3506 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3507 else 3508 FD = cast<FunctionDecl>(Target); 3509 3510 NamedDecl *OldDecl = 0; 3511 switch (CheckOverload(FD, Previous, OldDecl)) { 3512 case Ovl_Overload: 3513 return false; 3514 3515 case Ovl_NonFunction: 3516 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3517 break; 3518 3519 // We found a decl with the exact signature. 3520 case Ovl_Match: 3521 if (isa<UsingShadowDecl>(OldDecl)) { 3522 // Silently ignore the possible conflict. 3523 return false; 3524 } 3525 3526 // If we're in a record, we want to hide the target, so we 3527 // return true (without a diagnostic) to tell the caller not to 3528 // build a shadow decl. 3529 if (CurContext->isRecord()) 3530 return true; 3531 3532 // If we're not in a record, this is an error. 3533 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3534 break; 3535 } 3536 3537 Diag(Target->getLocation(), diag::note_using_decl_target); 3538 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3539 return true; 3540 } 3541 3542 // Target is not a function. 3543 3544 if (isa<TagDecl>(Target)) { 3545 // No conflict between a tag and a non-tag. 3546 if (!Tag) return false; 3547 3548 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3549 Diag(Target->getLocation(), diag::note_using_decl_target); 3550 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3551 return true; 3552 } 3553 3554 // No conflict between a tag and a non-tag. 3555 if (!NonTag) return false; 3556 3557 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3558 Diag(Target->getLocation(), diag::note_using_decl_target); 3559 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3560 return true; 3561} 3562 3563/// Builds a shadow declaration corresponding to a 'using' declaration. 3564UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3565 UsingDecl *UD, 3566 NamedDecl *Orig) { 3567 3568 // If we resolved to another shadow declaration, just coalesce them. 3569 NamedDecl *Target = Orig; 3570 if (isa<UsingShadowDecl>(Target)) { 3571 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3572 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3573 } 3574 3575 UsingShadowDecl *Shadow 3576 = UsingShadowDecl::Create(Context, CurContext, 3577 UD->getLocation(), UD, Target); 3578 UD->addShadowDecl(Shadow); 3579 3580 if (S) 3581 PushOnScopeChains(Shadow, S); 3582 else 3583 CurContext->addDecl(Shadow); 3584 Shadow->setAccess(UD->getAccess()); 3585 3586 // Register it as a conversion if appropriate. 3587 if (Shadow->getDeclName().getNameKind() 3588 == DeclarationName::CXXConversionFunctionName) 3589 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3590 3591 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3592 Shadow->setInvalidDecl(); 3593 3594 return Shadow; 3595} 3596 3597/// Hides a using shadow declaration. This is required by the current 3598/// using-decl implementation when a resolvable using declaration in a 3599/// class is followed by a declaration which would hide or override 3600/// one or more of the using decl's targets; for example: 3601/// 3602/// struct Base { void foo(int); }; 3603/// struct Derived : Base { 3604/// using Base::foo; 3605/// void foo(int); 3606/// }; 3607/// 3608/// The governing language is C++03 [namespace.udecl]p12: 3609/// 3610/// When a using-declaration brings names from a base class into a 3611/// derived class scope, member functions in the derived class 3612/// override and/or hide member functions with the same name and 3613/// parameter types in a base class (rather than conflicting). 3614/// 3615/// There are two ways to implement this: 3616/// (1) optimistically create shadow decls when they're not hidden 3617/// by existing declarations, or 3618/// (2) don't create any shadow decls (or at least don't make them 3619/// visible) until we've fully parsed/instantiated the class. 3620/// The problem with (1) is that we might have to retroactively remove 3621/// a shadow decl, which requires several O(n) operations because the 3622/// decl structures are (very reasonably) not designed for removal. 3623/// (2) avoids this but is very fiddly and phase-dependent. 3624void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3625 if (Shadow->getDeclName().getNameKind() == 3626 DeclarationName::CXXConversionFunctionName) 3627 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3628 3629 // Remove it from the DeclContext... 3630 Shadow->getDeclContext()->removeDecl(Shadow); 3631 3632 // ...and the scope, if applicable... 3633 if (S) { 3634 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3635 IdResolver.RemoveDecl(Shadow); 3636 } 3637 3638 // ...and the using decl. 3639 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3640 3641 // TODO: complain somehow if Shadow was used. It shouldn't 3642 // be possible for this to happen, because...? 3643} 3644 3645/// Builds a using declaration. 3646/// 3647/// \param IsInstantiation - Whether this call arises from an 3648/// instantiation of an unresolved using declaration. We treat 3649/// the lookup differently for these declarations. 3650NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3651 SourceLocation UsingLoc, 3652 CXXScopeSpec &SS, 3653 SourceLocation IdentLoc, 3654 DeclarationName Name, 3655 AttributeList *AttrList, 3656 bool IsInstantiation, 3657 bool IsTypeName, 3658 SourceLocation TypenameLoc) { 3659 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3660 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3661 3662 // FIXME: We ignore attributes for now. 3663 delete AttrList; 3664 3665 if (SS.isEmpty()) { 3666 Diag(IdentLoc, diag::err_using_requires_qualname); 3667 return 0; 3668 } 3669 3670 // Do the redeclaration lookup in the current scope. 3671 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3672 ForRedeclaration); 3673 Previous.setHideTags(false); 3674 if (S) { 3675 LookupName(Previous, S); 3676 3677 // It is really dumb that we have to do this. 3678 LookupResult::Filter F = Previous.makeFilter(); 3679 while (F.hasNext()) { 3680 NamedDecl *D = F.next(); 3681 if (!isDeclInScope(D, CurContext, S)) 3682 F.erase(); 3683 } 3684 F.done(); 3685 } else { 3686 assert(IsInstantiation && "no scope in non-instantiation"); 3687 assert(CurContext->isRecord() && "scope not record in instantiation"); 3688 LookupQualifiedName(Previous, CurContext); 3689 } 3690 3691 NestedNameSpecifier *NNS = 3692 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3693 3694 // Check for invalid redeclarations. 3695 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3696 return 0; 3697 3698 // Check for bad qualifiers. 3699 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3700 return 0; 3701 3702 DeclContext *LookupContext = computeDeclContext(SS); 3703 NamedDecl *D; 3704 if (!LookupContext) { 3705 if (IsTypeName) { 3706 // FIXME: not all declaration name kinds are legal here 3707 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3708 UsingLoc, TypenameLoc, 3709 SS.getRange(), NNS, 3710 IdentLoc, Name); 3711 } else { 3712 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3713 UsingLoc, SS.getRange(), NNS, 3714 IdentLoc, Name); 3715 } 3716 } else { 3717 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3718 SS.getRange(), UsingLoc, NNS, Name, 3719 IsTypeName); 3720 } 3721 D->setAccess(AS); 3722 CurContext->addDecl(D); 3723 3724 if (!LookupContext) return D; 3725 UsingDecl *UD = cast<UsingDecl>(D); 3726 3727 if (RequireCompleteDeclContext(SS, LookupContext)) { 3728 UD->setInvalidDecl(); 3729 return UD; 3730 } 3731 3732 // Look up the target name. 3733 3734 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3735 3736 // Unlike most lookups, we don't always want to hide tag 3737 // declarations: tag names are visible through the using declaration 3738 // even if hidden by ordinary names, *except* in a dependent context 3739 // where it's important for the sanity of two-phase lookup. 3740 if (!IsInstantiation) 3741 R.setHideTags(false); 3742 3743 LookupQualifiedName(R, LookupContext); 3744 3745 if (R.empty()) { 3746 Diag(IdentLoc, diag::err_no_member) 3747 << Name << LookupContext << SS.getRange(); 3748 UD->setInvalidDecl(); 3749 return UD; 3750 } 3751 3752 if (R.isAmbiguous()) { 3753 UD->setInvalidDecl(); 3754 return UD; 3755 } 3756 3757 if (IsTypeName) { 3758 // If we asked for a typename and got a non-type decl, error out. 3759 if (!R.getAsSingle<TypeDecl>()) { 3760 Diag(IdentLoc, diag::err_using_typename_non_type); 3761 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3762 Diag((*I)->getUnderlyingDecl()->getLocation(), 3763 diag::note_using_decl_target); 3764 UD->setInvalidDecl(); 3765 return UD; 3766 } 3767 } else { 3768 // If we asked for a non-typename and we got a type, error out, 3769 // but only if this is an instantiation of an unresolved using 3770 // decl. Otherwise just silently find the type name. 3771 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3772 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3773 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3774 UD->setInvalidDecl(); 3775 return UD; 3776 } 3777 } 3778 3779 // C++0x N2914 [namespace.udecl]p6: 3780 // A using-declaration shall not name a namespace. 3781 if (R.getAsSingle<NamespaceDecl>()) { 3782 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3783 << SS.getRange(); 3784 UD->setInvalidDecl(); 3785 return UD; 3786 } 3787 3788 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3789 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3790 BuildUsingShadowDecl(S, UD, *I); 3791 } 3792 3793 return UD; 3794} 3795 3796/// Checks that the given using declaration is not an invalid 3797/// redeclaration. Note that this is checking only for the using decl 3798/// itself, not for any ill-formedness among the UsingShadowDecls. 3799bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3800 bool isTypeName, 3801 const CXXScopeSpec &SS, 3802 SourceLocation NameLoc, 3803 const LookupResult &Prev) { 3804 // C++03 [namespace.udecl]p8: 3805 // C++0x [namespace.udecl]p10: 3806 // A using-declaration is a declaration and can therefore be used 3807 // repeatedly where (and only where) multiple declarations are 3808 // allowed. 3809 // That's only in file contexts. 3810 if (CurContext->getLookupContext()->isFileContext()) 3811 return false; 3812 3813 NestedNameSpecifier *Qual 3814 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3815 3816 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3817 NamedDecl *D = *I; 3818 3819 bool DTypename; 3820 NestedNameSpecifier *DQual; 3821 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3822 DTypename = UD->isTypeName(); 3823 DQual = UD->getTargetNestedNameDecl(); 3824 } else if (UnresolvedUsingValueDecl *UD 3825 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3826 DTypename = false; 3827 DQual = UD->getTargetNestedNameSpecifier(); 3828 } else if (UnresolvedUsingTypenameDecl *UD 3829 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3830 DTypename = true; 3831 DQual = UD->getTargetNestedNameSpecifier(); 3832 } else continue; 3833 3834 // using decls differ if one says 'typename' and the other doesn't. 3835 // FIXME: non-dependent using decls? 3836 if (isTypeName != DTypename) continue; 3837 3838 // using decls differ if they name different scopes (but note that 3839 // template instantiation can cause this check to trigger when it 3840 // didn't before instantiation). 3841 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3842 Context.getCanonicalNestedNameSpecifier(DQual)) 3843 continue; 3844 3845 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3846 Diag(D->getLocation(), diag::note_using_decl) << 1; 3847 return true; 3848 } 3849 3850 return false; 3851} 3852 3853 3854/// Checks that the given nested-name qualifier used in a using decl 3855/// in the current context is appropriately related to the current 3856/// scope. If an error is found, diagnoses it and returns true. 3857bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3858 const CXXScopeSpec &SS, 3859 SourceLocation NameLoc) { 3860 DeclContext *NamedContext = computeDeclContext(SS); 3861 3862 if (!CurContext->isRecord()) { 3863 // C++03 [namespace.udecl]p3: 3864 // C++0x [namespace.udecl]p8: 3865 // A using-declaration for a class member shall be a member-declaration. 3866 3867 // If we weren't able to compute a valid scope, it must be a 3868 // dependent class scope. 3869 if (!NamedContext || NamedContext->isRecord()) { 3870 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3871 << SS.getRange(); 3872 return true; 3873 } 3874 3875 // Otherwise, everything is known to be fine. 3876 return false; 3877 } 3878 3879 // The current scope is a record. 3880 3881 // If the named context is dependent, we can't decide much. 3882 if (!NamedContext) { 3883 // FIXME: in C++0x, we can diagnose if we can prove that the 3884 // nested-name-specifier does not refer to a base class, which is 3885 // still possible in some cases. 3886 3887 // Otherwise we have to conservatively report that things might be 3888 // okay. 3889 return false; 3890 } 3891 3892 if (!NamedContext->isRecord()) { 3893 // Ideally this would point at the last name in the specifier, 3894 // but we don't have that level of source info. 3895 Diag(SS.getRange().getBegin(), 3896 diag::err_using_decl_nested_name_specifier_is_not_class) 3897 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3898 return true; 3899 } 3900 3901 if (getLangOptions().CPlusPlus0x) { 3902 // C++0x [namespace.udecl]p3: 3903 // In a using-declaration used as a member-declaration, the 3904 // nested-name-specifier shall name a base class of the class 3905 // being defined. 3906 3907 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3908 cast<CXXRecordDecl>(NamedContext))) { 3909 if (CurContext == NamedContext) { 3910 Diag(NameLoc, 3911 diag::err_using_decl_nested_name_specifier_is_current_class) 3912 << SS.getRange(); 3913 return true; 3914 } 3915 3916 Diag(SS.getRange().getBegin(), 3917 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3918 << (NestedNameSpecifier*) SS.getScopeRep() 3919 << cast<CXXRecordDecl>(CurContext) 3920 << SS.getRange(); 3921 return true; 3922 } 3923 3924 return false; 3925 } 3926 3927 // C++03 [namespace.udecl]p4: 3928 // A using-declaration used as a member-declaration shall refer 3929 // to a member of a base class of the class being defined [etc.]. 3930 3931 // Salient point: SS doesn't have to name a base class as long as 3932 // lookup only finds members from base classes. Therefore we can 3933 // diagnose here only if we can prove that that can't happen, 3934 // i.e. if the class hierarchies provably don't intersect. 3935 3936 // TODO: it would be nice if "definitely valid" results were cached 3937 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3938 // need to be repeated. 3939 3940 struct UserData { 3941 llvm::DenseSet<const CXXRecordDecl*> Bases; 3942 3943 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3944 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3945 Data->Bases.insert(Base); 3946 return true; 3947 } 3948 3949 bool hasDependentBases(const CXXRecordDecl *Class) { 3950 return !Class->forallBases(collect, this); 3951 } 3952 3953 /// Returns true if the base is dependent or is one of the 3954 /// accumulated base classes. 3955 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3956 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3957 return !Data->Bases.count(Base); 3958 } 3959 3960 bool mightShareBases(const CXXRecordDecl *Class) { 3961 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3962 } 3963 }; 3964 3965 UserData Data; 3966 3967 // Returns false if we find a dependent base. 3968 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3969 return false; 3970 3971 // Returns false if the class has a dependent base or if it or one 3972 // of its bases is present in the base set of the current context. 3973 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3974 return false; 3975 3976 Diag(SS.getRange().getBegin(), 3977 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3978 << (NestedNameSpecifier*) SS.getScopeRep() 3979 << cast<CXXRecordDecl>(CurContext) 3980 << SS.getRange(); 3981 3982 return true; 3983} 3984 3985Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3986 SourceLocation NamespaceLoc, 3987 SourceLocation AliasLoc, 3988 IdentifierInfo *Alias, 3989 CXXScopeSpec &SS, 3990 SourceLocation IdentLoc, 3991 IdentifierInfo *Ident) { 3992 3993 // Lookup the namespace name. 3994 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3995 LookupParsedName(R, S, &SS); 3996 3997 // Check if we have a previous declaration with the same name. 3998 if (NamedDecl *PrevDecl 3999 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4000 ForRedeclaration)) { 4001 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4002 // We already have an alias with the same name that points to the same 4003 // namespace, so don't create a new one. 4004 // FIXME: At some point, we'll want to create the (redundant) 4005 // declaration to maintain better source information. 4006 if (!R.isAmbiguous() && !R.empty() && 4007 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4008 return DeclPtrTy(); 4009 } 4010 4011 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4012 diag::err_redefinition_different_kind; 4013 Diag(AliasLoc, DiagID) << Alias; 4014 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4015 return DeclPtrTy(); 4016 } 4017 4018 if (R.isAmbiguous()) 4019 return DeclPtrTy(); 4020 4021 if (R.empty()) { 4022 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4023 return DeclPtrTy(); 4024 } 4025 4026 NamespaceAliasDecl *AliasDecl = 4027 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4028 Alias, SS.getRange(), 4029 (NestedNameSpecifier *)SS.getScopeRep(), 4030 IdentLoc, R.getFoundDecl()); 4031 4032 PushOnScopeChains(AliasDecl, S); 4033 return DeclPtrTy::make(AliasDecl); 4034} 4035 4036void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4037 CXXConstructorDecl *Constructor) { 4038 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4039 !Constructor->isUsed()) && 4040 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4041 4042 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4043 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4044 4045 DeclContext *PreviousContext = CurContext; 4046 CurContext = Constructor; 4047 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 4048 Diag(CurrentLocation, diag::note_member_synthesized_at) 4049 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4050 Constructor->setInvalidDecl(); 4051 } else { 4052 Constructor->setUsed(); 4053 } 4054 CurContext = PreviousContext; 4055} 4056 4057void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4058 CXXDestructorDecl *Destructor) { 4059 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4060 "DefineImplicitDestructor - call it for implicit default dtor"); 4061 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4062 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4063 4064 DeclContext *PreviousContext = CurContext; 4065 CurContext = Destructor; 4066 4067 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4068 Destructor->getParent()); 4069 4070 // FIXME: If CheckDestructor fails, we should emit a note about where the 4071 // implicit destructor was needed. 4072 if (CheckDestructor(Destructor)) { 4073 Diag(CurrentLocation, diag::note_member_synthesized_at) 4074 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4075 4076 Destructor->setInvalidDecl(); 4077 CurContext = PreviousContext; 4078 4079 return; 4080 } 4081 CurContext = PreviousContext; 4082 4083 Destructor->setUsed(); 4084} 4085 4086void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 4087 CXXMethodDecl *MethodDecl) { 4088 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 4089 MethodDecl->getOverloadedOperator() == OO_Equal && 4090 !MethodDecl->isUsed()) && 4091 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 4092 4093 CXXRecordDecl *ClassDecl 4094 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 4095 4096 DeclContext *PreviousContext = CurContext; 4097 CurContext = MethodDecl; 4098 4099 // C++[class.copy] p12 4100 // Before the implicitly-declared copy assignment operator for a class is 4101 // implicitly defined, all implicitly-declared copy assignment operators 4102 // for its direct base classes and its nonstatic data members shall have 4103 // been implicitly defined. 4104 bool err = false; 4105 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4106 E = ClassDecl->bases_end(); Base != E; ++Base) { 4107 CXXRecordDecl *BaseClassDecl 4108 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4109 if (CXXMethodDecl *BaseAssignOpMethod = 4110 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4111 BaseClassDecl)) { 4112 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4113 BaseAssignOpMethod, 4114 PDiag(diag::err_access_assign_base) 4115 << Base->getType()); 4116 4117 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 4118 } 4119 } 4120 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4121 E = ClassDecl->field_end(); Field != E; ++Field) { 4122 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4123 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4124 FieldType = Array->getElementType(); 4125 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4126 CXXRecordDecl *FieldClassDecl 4127 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4128 if (CXXMethodDecl *FieldAssignOpMethod = 4129 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4130 FieldClassDecl)) { 4131 CheckDirectMemberAccess(Field->getLocation(), 4132 FieldAssignOpMethod, 4133 PDiag(diag::err_access_assign_field) 4134 << Field->getDeclName() << Field->getType()); 4135 4136 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 4137 } 4138 } else if (FieldType->isReferenceType()) { 4139 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4140 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4141 Diag(Field->getLocation(), diag::note_declared_at); 4142 Diag(CurrentLocation, diag::note_first_required_here); 4143 err = true; 4144 } else if (FieldType.isConstQualified()) { 4145 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4146 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4147 Diag(Field->getLocation(), diag::note_declared_at); 4148 Diag(CurrentLocation, diag::note_first_required_here); 4149 err = true; 4150 } 4151 } 4152 if (!err) 4153 MethodDecl->setUsed(); 4154 4155 CurContext = PreviousContext; 4156} 4157 4158CXXMethodDecl * 4159Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4160 ParmVarDecl *ParmDecl, 4161 CXXRecordDecl *ClassDecl) { 4162 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4163 QualType RHSType(LHSType); 4164 // If class's assignment operator argument is const/volatile qualified, 4165 // look for operator = (const/volatile B&). Otherwise, look for 4166 // operator = (B&). 4167 RHSType = Context.getCVRQualifiedType(RHSType, 4168 ParmDecl->getType().getCVRQualifiers()); 4169 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4170 LHSType, 4171 SourceLocation())); 4172 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4173 RHSType, 4174 CurrentLocation)); 4175 Expr *Args[2] = { &*LHS, &*RHS }; 4176 OverloadCandidateSet CandidateSet(CurrentLocation); 4177 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4178 CandidateSet); 4179 OverloadCandidateSet::iterator Best; 4180 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4181 return cast<CXXMethodDecl>(Best->Function); 4182 assert(false && 4183 "getAssignOperatorMethod - copy assignment operator method not found"); 4184 return 0; 4185} 4186 4187void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4188 CXXConstructorDecl *CopyConstructor, 4189 unsigned TypeQuals) { 4190 assert((CopyConstructor->isImplicit() && 4191 CopyConstructor->isCopyConstructor(TypeQuals) && 4192 !CopyConstructor->isUsed()) && 4193 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4194 4195 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4196 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4197 4198 DeclContext *PreviousContext = CurContext; 4199 CurContext = CopyConstructor; 4200 4201 // C++ [class.copy] p209 4202 // Before the implicitly-declared copy constructor for a class is 4203 // implicitly defined, all the implicitly-declared copy constructors 4204 // for its base class and its non-static data members shall have been 4205 // implicitly defined. 4206 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 4207 Base != ClassDecl->bases_end(); ++Base) { 4208 CXXRecordDecl *BaseClassDecl 4209 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4210 if (CXXConstructorDecl *BaseCopyCtor = 4211 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4212 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4213 BaseCopyCtor, 4214 PDiag(diag::err_access_copy_base) 4215 << Base->getType()); 4216 4217 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4218 } 4219 } 4220 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4221 FieldEnd = ClassDecl->field_end(); 4222 Field != FieldEnd; ++Field) { 4223 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4224 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4225 FieldType = Array->getElementType(); 4226 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4227 CXXRecordDecl *FieldClassDecl 4228 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4229 if (CXXConstructorDecl *FieldCopyCtor = 4230 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4231 CheckDirectMemberAccess(Field->getLocation(), 4232 FieldCopyCtor, 4233 PDiag(diag::err_access_copy_field) 4234 << Field->getDeclName() << Field->getType()); 4235 4236 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4237 } 4238 } 4239 } 4240 CopyConstructor->setUsed(); 4241 4242 CurContext = PreviousContext; 4243} 4244 4245Sema::OwningExprResult 4246Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4247 CXXConstructorDecl *Constructor, 4248 MultiExprArg ExprArgs, 4249 bool RequiresZeroInit, 4250 bool BaseInitialization) { 4251 bool Elidable = false; 4252 4253 // C++0x [class.copy]p34: 4254 // When certain criteria are met, an implementation is allowed to 4255 // omit the copy/move construction of a class object, even if the 4256 // copy/move constructor and/or destructor for the object have 4257 // side effects. [...] 4258 // - when a temporary class object that has not been bound to a 4259 // reference (12.2) would be copied/moved to a class object 4260 // with the same cv-unqualified type, the copy/move operation 4261 // can be omitted by constructing the temporary object 4262 // directly into the target of the omitted copy/move 4263 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4264 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4265 Elidable = SubExpr->isTemporaryObject() && 4266 Context.hasSameUnqualifiedType(SubExpr->getType(), 4267 Context.getTypeDeclType(Constructor->getParent())); 4268 } 4269 4270 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4271 Elidable, move(ExprArgs), RequiresZeroInit, 4272 BaseInitialization); 4273} 4274 4275/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4276/// including handling of its default argument expressions. 4277Sema::OwningExprResult 4278Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4279 CXXConstructorDecl *Constructor, bool Elidable, 4280 MultiExprArg ExprArgs, 4281 bool RequiresZeroInit, 4282 bool BaseInitialization) { 4283 unsigned NumExprs = ExprArgs.size(); 4284 Expr **Exprs = (Expr **)ExprArgs.release(); 4285 4286 MarkDeclarationReferenced(ConstructLoc, Constructor); 4287 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4288 Constructor, Elidable, Exprs, NumExprs, 4289 RequiresZeroInit, BaseInitialization)); 4290} 4291 4292bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4293 CXXConstructorDecl *Constructor, 4294 MultiExprArg Exprs) { 4295 OwningExprResult TempResult = 4296 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4297 move(Exprs)); 4298 if (TempResult.isInvalid()) 4299 return true; 4300 4301 Expr *Temp = TempResult.takeAs<Expr>(); 4302 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4303 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4304 VD->setInit(Temp); 4305 4306 return false; 4307} 4308 4309void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4310 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4311 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4312 !ClassDecl->hasTrivialDestructor()) { 4313 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4314 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4315 CheckDestructorAccess(VD->getLocation(), Destructor, 4316 PDiag(diag::err_access_dtor_var) 4317 << VD->getDeclName() 4318 << VD->getType()); 4319 } 4320} 4321 4322/// AddCXXDirectInitializerToDecl - This action is called immediately after 4323/// ActOnDeclarator, when a C++ direct initializer is present. 4324/// e.g: "int x(1);" 4325void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4326 SourceLocation LParenLoc, 4327 MultiExprArg Exprs, 4328 SourceLocation *CommaLocs, 4329 SourceLocation RParenLoc) { 4330 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4331 Decl *RealDecl = Dcl.getAs<Decl>(); 4332 4333 // If there is no declaration, there was an error parsing it. Just ignore 4334 // the initializer. 4335 if (RealDecl == 0) 4336 return; 4337 4338 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4339 if (!VDecl) { 4340 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4341 RealDecl->setInvalidDecl(); 4342 return; 4343 } 4344 4345 // We will represent direct-initialization similarly to copy-initialization: 4346 // int x(1); -as-> int x = 1; 4347 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4348 // 4349 // Clients that want to distinguish between the two forms, can check for 4350 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4351 // A major benefit is that clients that don't particularly care about which 4352 // exactly form was it (like the CodeGen) can handle both cases without 4353 // special case code. 4354 4355 // C++ 8.5p11: 4356 // The form of initialization (using parentheses or '=') is generally 4357 // insignificant, but does matter when the entity being initialized has a 4358 // class type. 4359 QualType DeclInitType = VDecl->getType(); 4360 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4361 DeclInitType = Context.getBaseElementType(Array); 4362 4363 if (!VDecl->getType()->isDependentType() && 4364 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4365 diag::err_typecheck_decl_incomplete_type)) { 4366 VDecl->setInvalidDecl(); 4367 return; 4368 } 4369 4370 // The variable can not have an abstract class type. 4371 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4372 diag::err_abstract_type_in_decl, 4373 AbstractVariableType)) 4374 VDecl->setInvalidDecl(); 4375 4376 const VarDecl *Def; 4377 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4378 Diag(VDecl->getLocation(), diag::err_redefinition) 4379 << VDecl->getDeclName(); 4380 Diag(Def->getLocation(), diag::note_previous_definition); 4381 VDecl->setInvalidDecl(); 4382 return; 4383 } 4384 4385 // If either the declaration has a dependent type or if any of the 4386 // expressions is type-dependent, we represent the initialization 4387 // via a ParenListExpr for later use during template instantiation. 4388 if (VDecl->getType()->isDependentType() || 4389 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4390 // Let clients know that initialization was done with a direct initializer. 4391 VDecl->setCXXDirectInitializer(true); 4392 4393 // Store the initialization expressions as a ParenListExpr. 4394 unsigned NumExprs = Exprs.size(); 4395 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4396 (Expr **)Exprs.release(), 4397 NumExprs, RParenLoc)); 4398 return; 4399 } 4400 4401 // Capture the variable that is being initialized and the style of 4402 // initialization. 4403 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4404 4405 // FIXME: Poor source location information. 4406 InitializationKind Kind 4407 = InitializationKind::CreateDirect(VDecl->getLocation(), 4408 LParenLoc, RParenLoc); 4409 4410 InitializationSequence InitSeq(*this, Entity, Kind, 4411 (Expr**)Exprs.get(), Exprs.size()); 4412 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4413 if (Result.isInvalid()) { 4414 VDecl->setInvalidDecl(); 4415 return; 4416 } 4417 4418 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4419 VDecl->setInit(Result.takeAs<Expr>()); 4420 VDecl->setCXXDirectInitializer(true); 4421 4422 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4423 FinalizeVarWithDestructor(VDecl, Record); 4424} 4425 4426/// \brief Given a constructor and the set of arguments provided for the 4427/// constructor, convert the arguments and add any required default arguments 4428/// to form a proper call to this constructor. 4429/// 4430/// \returns true if an error occurred, false otherwise. 4431bool 4432Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4433 MultiExprArg ArgsPtr, 4434 SourceLocation Loc, 4435 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4436 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4437 unsigned NumArgs = ArgsPtr.size(); 4438 Expr **Args = (Expr **)ArgsPtr.get(); 4439 4440 const FunctionProtoType *Proto 4441 = Constructor->getType()->getAs<FunctionProtoType>(); 4442 assert(Proto && "Constructor without a prototype?"); 4443 unsigned NumArgsInProto = Proto->getNumArgs(); 4444 4445 // If too few arguments are available, we'll fill in the rest with defaults. 4446 if (NumArgs < NumArgsInProto) 4447 ConvertedArgs.reserve(NumArgsInProto); 4448 else 4449 ConvertedArgs.reserve(NumArgs); 4450 4451 VariadicCallType CallType = 4452 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4453 llvm::SmallVector<Expr *, 8> AllArgs; 4454 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4455 Proto, 0, Args, NumArgs, AllArgs, 4456 CallType); 4457 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4458 ConvertedArgs.push_back(AllArgs[i]); 4459 return Invalid; 4460} 4461 4462static inline bool 4463CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4464 const FunctionDecl *FnDecl) { 4465 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4466 if (isa<NamespaceDecl>(DC)) { 4467 return SemaRef.Diag(FnDecl->getLocation(), 4468 diag::err_operator_new_delete_declared_in_namespace) 4469 << FnDecl->getDeclName(); 4470 } 4471 4472 if (isa<TranslationUnitDecl>(DC) && 4473 FnDecl->getStorageClass() == FunctionDecl::Static) { 4474 return SemaRef.Diag(FnDecl->getLocation(), 4475 diag::err_operator_new_delete_declared_static) 4476 << FnDecl->getDeclName(); 4477 } 4478 4479 return false; 4480} 4481 4482static inline bool 4483CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4484 CanQualType ExpectedResultType, 4485 CanQualType ExpectedFirstParamType, 4486 unsigned DependentParamTypeDiag, 4487 unsigned InvalidParamTypeDiag) { 4488 QualType ResultType = 4489 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4490 4491 // Check that the result type is not dependent. 4492 if (ResultType->isDependentType()) 4493 return SemaRef.Diag(FnDecl->getLocation(), 4494 diag::err_operator_new_delete_dependent_result_type) 4495 << FnDecl->getDeclName() << ExpectedResultType; 4496 4497 // Check that the result type is what we expect. 4498 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4499 return SemaRef.Diag(FnDecl->getLocation(), 4500 diag::err_operator_new_delete_invalid_result_type) 4501 << FnDecl->getDeclName() << ExpectedResultType; 4502 4503 // A function template must have at least 2 parameters. 4504 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4505 return SemaRef.Diag(FnDecl->getLocation(), 4506 diag::err_operator_new_delete_template_too_few_parameters) 4507 << FnDecl->getDeclName(); 4508 4509 // The function decl must have at least 1 parameter. 4510 if (FnDecl->getNumParams() == 0) 4511 return SemaRef.Diag(FnDecl->getLocation(), 4512 diag::err_operator_new_delete_too_few_parameters) 4513 << FnDecl->getDeclName(); 4514 4515 // Check the the first parameter type is not dependent. 4516 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4517 if (FirstParamType->isDependentType()) 4518 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4519 << FnDecl->getDeclName() << ExpectedFirstParamType; 4520 4521 // Check that the first parameter type is what we expect. 4522 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4523 ExpectedFirstParamType) 4524 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4525 << FnDecl->getDeclName() << ExpectedFirstParamType; 4526 4527 return false; 4528} 4529 4530static bool 4531CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4532 // C++ [basic.stc.dynamic.allocation]p1: 4533 // A program is ill-formed if an allocation function is declared in a 4534 // namespace scope other than global scope or declared static in global 4535 // scope. 4536 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4537 return true; 4538 4539 CanQualType SizeTy = 4540 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4541 4542 // C++ [basic.stc.dynamic.allocation]p1: 4543 // The return type shall be void*. The first parameter shall have type 4544 // std::size_t. 4545 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4546 SizeTy, 4547 diag::err_operator_new_dependent_param_type, 4548 diag::err_operator_new_param_type)) 4549 return true; 4550 4551 // C++ [basic.stc.dynamic.allocation]p1: 4552 // The first parameter shall not have an associated default argument. 4553 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4554 return SemaRef.Diag(FnDecl->getLocation(), 4555 diag::err_operator_new_default_arg) 4556 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4557 4558 return false; 4559} 4560 4561static bool 4562CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4563 // C++ [basic.stc.dynamic.deallocation]p1: 4564 // A program is ill-formed if deallocation functions are declared in a 4565 // namespace scope other than global scope or declared static in global 4566 // scope. 4567 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4568 return true; 4569 4570 // C++ [basic.stc.dynamic.deallocation]p2: 4571 // Each deallocation function shall return void and its first parameter 4572 // shall be void*. 4573 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4574 SemaRef.Context.VoidPtrTy, 4575 diag::err_operator_delete_dependent_param_type, 4576 diag::err_operator_delete_param_type)) 4577 return true; 4578 4579 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4580 if (FirstParamType->isDependentType()) 4581 return SemaRef.Diag(FnDecl->getLocation(), 4582 diag::err_operator_delete_dependent_param_type) 4583 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4584 4585 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4586 SemaRef.Context.VoidPtrTy) 4587 return SemaRef.Diag(FnDecl->getLocation(), 4588 diag::err_operator_delete_param_type) 4589 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4590 4591 return false; 4592} 4593 4594/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4595/// of this overloaded operator is well-formed. If so, returns false; 4596/// otherwise, emits appropriate diagnostics and returns true. 4597bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4598 assert(FnDecl && FnDecl->isOverloadedOperator() && 4599 "Expected an overloaded operator declaration"); 4600 4601 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4602 4603 // C++ [over.oper]p5: 4604 // The allocation and deallocation functions, operator new, 4605 // operator new[], operator delete and operator delete[], are 4606 // described completely in 3.7.3. The attributes and restrictions 4607 // found in the rest of this subclause do not apply to them unless 4608 // explicitly stated in 3.7.3. 4609 if (Op == OO_Delete || Op == OO_Array_Delete) 4610 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4611 4612 if (Op == OO_New || Op == OO_Array_New) 4613 return CheckOperatorNewDeclaration(*this, FnDecl); 4614 4615 // C++ [over.oper]p6: 4616 // An operator function shall either be a non-static member 4617 // function or be a non-member function and have at least one 4618 // parameter whose type is a class, a reference to a class, an 4619 // enumeration, or a reference to an enumeration. 4620 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4621 if (MethodDecl->isStatic()) 4622 return Diag(FnDecl->getLocation(), 4623 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4624 } else { 4625 bool ClassOrEnumParam = false; 4626 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4627 ParamEnd = FnDecl->param_end(); 4628 Param != ParamEnd; ++Param) { 4629 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4630 if (ParamType->isDependentType() || ParamType->isRecordType() || 4631 ParamType->isEnumeralType()) { 4632 ClassOrEnumParam = true; 4633 break; 4634 } 4635 } 4636 4637 if (!ClassOrEnumParam) 4638 return Diag(FnDecl->getLocation(), 4639 diag::err_operator_overload_needs_class_or_enum) 4640 << FnDecl->getDeclName(); 4641 } 4642 4643 // C++ [over.oper]p8: 4644 // An operator function cannot have default arguments (8.3.6), 4645 // except where explicitly stated below. 4646 // 4647 // Only the function-call operator allows default arguments 4648 // (C++ [over.call]p1). 4649 if (Op != OO_Call) { 4650 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4651 Param != FnDecl->param_end(); ++Param) { 4652 if ((*Param)->hasDefaultArg()) 4653 return Diag((*Param)->getLocation(), 4654 diag::err_operator_overload_default_arg) 4655 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4656 } 4657 } 4658 4659 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4660 { false, false, false } 4661#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4662 , { Unary, Binary, MemberOnly } 4663#include "clang/Basic/OperatorKinds.def" 4664 }; 4665 4666 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4667 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4668 bool MustBeMemberOperator = OperatorUses[Op][2]; 4669 4670 // C++ [over.oper]p8: 4671 // [...] Operator functions cannot have more or fewer parameters 4672 // than the number required for the corresponding operator, as 4673 // described in the rest of this subclause. 4674 unsigned NumParams = FnDecl->getNumParams() 4675 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4676 if (Op != OO_Call && 4677 ((NumParams == 1 && !CanBeUnaryOperator) || 4678 (NumParams == 2 && !CanBeBinaryOperator) || 4679 (NumParams < 1) || (NumParams > 2))) { 4680 // We have the wrong number of parameters. 4681 unsigned ErrorKind; 4682 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4683 ErrorKind = 2; // 2 -> unary or binary. 4684 } else if (CanBeUnaryOperator) { 4685 ErrorKind = 0; // 0 -> unary 4686 } else { 4687 assert(CanBeBinaryOperator && 4688 "All non-call overloaded operators are unary or binary!"); 4689 ErrorKind = 1; // 1 -> binary 4690 } 4691 4692 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4693 << FnDecl->getDeclName() << NumParams << ErrorKind; 4694 } 4695 4696 // Overloaded operators other than operator() cannot be variadic. 4697 if (Op != OO_Call && 4698 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4699 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4700 << FnDecl->getDeclName(); 4701 } 4702 4703 // Some operators must be non-static member functions. 4704 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4705 return Diag(FnDecl->getLocation(), 4706 diag::err_operator_overload_must_be_member) 4707 << FnDecl->getDeclName(); 4708 } 4709 4710 // C++ [over.inc]p1: 4711 // The user-defined function called operator++ implements the 4712 // prefix and postfix ++ operator. If this function is a member 4713 // function with no parameters, or a non-member function with one 4714 // parameter of class or enumeration type, it defines the prefix 4715 // increment operator ++ for objects of that type. If the function 4716 // is a member function with one parameter (which shall be of type 4717 // int) or a non-member function with two parameters (the second 4718 // of which shall be of type int), it defines the postfix 4719 // increment operator ++ for objects of that type. 4720 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4721 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4722 bool ParamIsInt = false; 4723 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4724 ParamIsInt = BT->getKind() == BuiltinType::Int; 4725 4726 if (!ParamIsInt) 4727 return Diag(LastParam->getLocation(), 4728 diag::err_operator_overload_post_incdec_must_be_int) 4729 << LastParam->getType() << (Op == OO_MinusMinus); 4730 } 4731 4732 // Notify the class if it got an assignment operator. 4733 if (Op == OO_Equal) { 4734 // Would have returned earlier otherwise. 4735 assert(isa<CXXMethodDecl>(FnDecl) && 4736 "Overloaded = not member, but not filtered."); 4737 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4738 Method->getParent()->addedAssignmentOperator(Context, Method); 4739 } 4740 4741 return false; 4742} 4743 4744/// CheckLiteralOperatorDeclaration - Check whether the declaration 4745/// of this literal operator function is well-formed. If so, returns 4746/// false; otherwise, emits appropriate diagnostics and returns true. 4747bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4748 DeclContext *DC = FnDecl->getDeclContext(); 4749 Decl::Kind Kind = DC->getDeclKind(); 4750 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4751 Kind != Decl::LinkageSpec) { 4752 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4753 << FnDecl->getDeclName(); 4754 return true; 4755 } 4756 4757 bool Valid = false; 4758 4759 // template <char...> type operator "" name() is the only valid template 4760 // signature, and the only valid signature with no parameters. 4761 if (FnDecl->param_size() == 0) { 4762 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4763 // Must have only one template parameter 4764 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4765 if (Params->size() == 1) { 4766 NonTypeTemplateParmDecl *PmDecl = 4767 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4768 4769 // The template parameter must be a char parameter pack. 4770 // FIXME: This test will always fail because non-type parameter packs 4771 // have not been implemented. 4772 if (PmDecl && PmDecl->isTemplateParameterPack() && 4773 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4774 Valid = true; 4775 } 4776 } 4777 } else { 4778 // Check the first parameter 4779 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4780 4781 QualType T = (*Param)->getType(); 4782 4783 // unsigned long long int, long double, and any character type are allowed 4784 // as the only parameters. 4785 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4786 Context.hasSameType(T, Context.LongDoubleTy) || 4787 Context.hasSameType(T, Context.CharTy) || 4788 Context.hasSameType(T, Context.WCharTy) || 4789 Context.hasSameType(T, Context.Char16Ty) || 4790 Context.hasSameType(T, Context.Char32Ty)) { 4791 if (++Param == FnDecl->param_end()) 4792 Valid = true; 4793 goto FinishedParams; 4794 } 4795 4796 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4797 const PointerType *PT = T->getAs<PointerType>(); 4798 if (!PT) 4799 goto FinishedParams; 4800 T = PT->getPointeeType(); 4801 if (!T.isConstQualified()) 4802 goto FinishedParams; 4803 T = T.getUnqualifiedType(); 4804 4805 // Move on to the second parameter; 4806 ++Param; 4807 4808 // If there is no second parameter, the first must be a const char * 4809 if (Param == FnDecl->param_end()) { 4810 if (Context.hasSameType(T, Context.CharTy)) 4811 Valid = true; 4812 goto FinishedParams; 4813 } 4814 4815 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4816 // are allowed as the first parameter to a two-parameter function 4817 if (!(Context.hasSameType(T, Context.CharTy) || 4818 Context.hasSameType(T, Context.WCharTy) || 4819 Context.hasSameType(T, Context.Char16Ty) || 4820 Context.hasSameType(T, Context.Char32Ty))) 4821 goto FinishedParams; 4822 4823 // The second and final parameter must be an std::size_t 4824 T = (*Param)->getType().getUnqualifiedType(); 4825 if (Context.hasSameType(T, Context.getSizeType()) && 4826 ++Param == FnDecl->param_end()) 4827 Valid = true; 4828 } 4829 4830 // FIXME: This diagnostic is absolutely terrible. 4831FinishedParams: 4832 if (!Valid) { 4833 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4834 << FnDecl->getDeclName(); 4835 return true; 4836 } 4837 4838 return false; 4839} 4840 4841/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4842/// linkage specification, including the language and (if present) 4843/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4844/// the location of the language string literal, which is provided 4845/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4846/// the '{' brace. Otherwise, this linkage specification does not 4847/// have any braces. 4848Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4849 SourceLocation ExternLoc, 4850 SourceLocation LangLoc, 4851 const char *Lang, 4852 unsigned StrSize, 4853 SourceLocation LBraceLoc) { 4854 LinkageSpecDecl::LanguageIDs Language; 4855 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4856 Language = LinkageSpecDecl::lang_c; 4857 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4858 Language = LinkageSpecDecl::lang_cxx; 4859 else { 4860 Diag(LangLoc, diag::err_bad_language); 4861 return DeclPtrTy(); 4862 } 4863 4864 // FIXME: Add all the various semantics of linkage specifications 4865 4866 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4867 LangLoc, Language, 4868 LBraceLoc.isValid()); 4869 CurContext->addDecl(D); 4870 PushDeclContext(S, D); 4871 return DeclPtrTy::make(D); 4872} 4873 4874/// ActOnFinishLinkageSpecification - Completely the definition of 4875/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4876/// valid, it's the position of the closing '}' brace in a linkage 4877/// specification that uses braces. 4878Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4879 DeclPtrTy LinkageSpec, 4880 SourceLocation RBraceLoc) { 4881 if (LinkageSpec) 4882 PopDeclContext(); 4883 return LinkageSpec; 4884} 4885 4886/// \brief Perform semantic analysis for the variable declaration that 4887/// occurs within a C++ catch clause, returning the newly-created 4888/// variable. 4889VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4890 TypeSourceInfo *TInfo, 4891 IdentifierInfo *Name, 4892 SourceLocation Loc, 4893 SourceRange Range) { 4894 bool Invalid = false; 4895 4896 // Arrays and functions decay. 4897 if (ExDeclType->isArrayType()) 4898 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4899 else if (ExDeclType->isFunctionType()) 4900 ExDeclType = Context.getPointerType(ExDeclType); 4901 4902 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4903 // The exception-declaration shall not denote a pointer or reference to an 4904 // incomplete type, other than [cv] void*. 4905 // N2844 forbids rvalue references. 4906 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4907 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4908 Invalid = true; 4909 } 4910 4911 // GCC allows catching pointers and references to incomplete types 4912 // as an extension; so do we, but we warn by default. 4913 4914 QualType BaseType = ExDeclType; 4915 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4916 unsigned DK = diag::err_catch_incomplete; 4917 bool IncompleteCatchIsInvalid = true; 4918 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4919 BaseType = Ptr->getPointeeType(); 4920 Mode = 1; 4921 DK = diag::ext_catch_incomplete_ptr; 4922 IncompleteCatchIsInvalid = false; 4923 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4924 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4925 BaseType = Ref->getPointeeType(); 4926 Mode = 2; 4927 DK = diag::ext_catch_incomplete_ref; 4928 IncompleteCatchIsInvalid = false; 4929 } 4930 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4931 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4932 IncompleteCatchIsInvalid) 4933 Invalid = true; 4934 4935 if (!Invalid && !ExDeclType->isDependentType() && 4936 RequireNonAbstractType(Loc, ExDeclType, 4937 diag::err_abstract_type_in_decl, 4938 AbstractVariableType)) 4939 Invalid = true; 4940 4941 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4942 Name, ExDeclType, TInfo, VarDecl::None, 4943 VarDecl::None); 4944 4945 if (!Invalid) { 4946 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4947 // C++ [except.handle]p16: 4948 // The object declared in an exception-declaration or, if the 4949 // exception-declaration does not specify a name, a temporary (12.2) is 4950 // copy-initialized (8.5) from the exception object. [...] 4951 // The object is destroyed when the handler exits, after the destruction 4952 // of any automatic objects initialized within the handler. 4953 // 4954 // We just pretend to initialize the object with itself, then make sure 4955 // it can be destroyed later. 4956 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4957 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4958 Loc, ExDeclType, 0); 4959 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4960 SourceLocation()); 4961 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4962 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4963 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4964 if (Result.isInvalid()) 4965 Invalid = true; 4966 else 4967 FinalizeVarWithDestructor(ExDecl, RecordTy); 4968 } 4969 } 4970 4971 if (Invalid) 4972 ExDecl->setInvalidDecl(); 4973 4974 return ExDecl; 4975} 4976 4977/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4978/// handler. 4979Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4980 TypeSourceInfo *TInfo = 0; 4981 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4982 4983 bool Invalid = D.isInvalidType(); 4984 IdentifierInfo *II = D.getIdentifier(); 4985 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4986 LookupOrdinaryName, 4987 ForRedeclaration)) { 4988 // The scope should be freshly made just for us. There is just no way 4989 // it contains any previous declaration. 4990 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4991 if (PrevDecl->isTemplateParameter()) { 4992 // Maybe we will complain about the shadowed template parameter. 4993 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4994 } 4995 } 4996 4997 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4998 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4999 << D.getCXXScopeSpec().getRange(); 5000 Invalid = true; 5001 } 5002 5003 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5004 D.getIdentifier(), 5005 D.getIdentifierLoc(), 5006 D.getDeclSpec().getSourceRange()); 5007 5008 if (Invalid) 5009 ExDecl->setInvalidDecl(); 5010 5011 // Add the exception declaration into this scope. 5012 if (II) 5013 PushOnScopeChains(ExDecl, S); 5014 else 5015 CurContext->addDecl(ExDecl); 5016 5017 ProcessDeclAttributes(S, ExDecl, D); 5018 return DeclPtrTy::make(ExDecl); 5019} 5020 5021Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5022 ExprArg assertexpr, 5023 ExprArg assertmessageexpr) { 5024 Expr *AssertExpr = (Expr *)assertexpr.get(); 5025 StringLiteral *AssertMessage = 5026 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5027 5028 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5029 llvm::APSInt Value(32); 5030 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5031 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5032 AssertExpr->getSourceRange(); 5033 return DeclPtrTy(); 5034 } 5035 5036 if (Value == 0) { 5037 Diag(AssertLoc, diag::err_static_assert_failed) 5038 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5039 } 5040 } 5041 5042 assertexpr.release(); 5043 assertmessageexpr.release(); 5044 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5045 AssertExpr, AssertMessage); 5046 5047 CurContext->addDecl(Decl); 5048 return DeclPtrTy::make(Decl); 5049} 5050 5051/// \brief Perform semantic analysis of the given friend type declaration. 5052/// 5053/// \returns A friend declaration that. 5054FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5055 TypeSourceInfo *TSInfo) { 5056 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5057 5058 QualType T = TSInfo->getType(); 5059 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5060 5061 if (!getLangOptions().CPlusPlus0x) { 5062 // C++03 [class.friend]p2: 5063 // An elaborated-type-specifier shall be used in a friend declaration 5064 // for a class.* 5065 // 5066 // * The class-key of the elaborated-type-specifier is required. 5067 if (!ActiveTemplateInstantiations.empty()) { 5068 // Do not complain about the form of friend template types during 5069 // template instantiation; we will already have complained when the 5070 // template was declared. 5071 } else if (!T->isElaboratedTypeSpecifier()) { 5072 // If we evaluated the type to a record type, suggest putting 5073 // a tag in front. 5074 if (const RecordType *RT = T->getAs<RecordType>()) { 5075 RecordDecl *RD = RT->getDecl(); 5076 5077 std::string InsertionText = std::string(" ") + RD->getKindName(); 5078 5079 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5080 << (unsigned) RD->getTagKind() 5081 << T 5082 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5083 InsertionText); 5084 } else { 5085 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5086 << T 5087 << SourceRange(FriendLoc, TypeRange.getEnd()); 5088 } 5089 } else if (T->getAs<EnumType>()) { 5090 Diag(FriendLoc, diag::ext_enum_friend) 5091 << T 5092 << SourceRange(FriendLoc, TypeRange.getEnd()); 5093 } 5094 } 5095 5096 // C++0x [class.friend]p3: 5097 // If the type specifier in a friend declaration designates a (possibly 5098 // cv-qualified) class type, that class is declared as a friend; otherwise, 5099 // the friend declaration is ignored. 5100 5101 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5102 // in [class.friend]p3 that we do not implement. 5103 5104 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5105} 5106 5107/// Handle a friend type declaration. This works in tandem with 5108/// ActOnTag. 5109/// 5110/// Notes on friend class templates: 5111/// 5112/// We generally treat friend class declarations as if they were 5113/// declaring a class. So, for example, the elaborated type specifier 5114/// in a friend declaration is required to obey the restrictions of a 5115/// class-head (i.e. no typedefs in the scope chain), template 5116/// parameters are required to match up with simple template-ids, &c. 5117/// However, unlike when declaring a template specialization, it's 5118/// okay to refer to a template specialization without an empty 5119/// template parameter declaration, e.g. 5120/// friend class A<T>::B<unsigned>; 5121/// We permit this as a special case; if there are any template 5122/// parameters present at all, require proper matching, i.e. 5123/// template <> template <class T> friend class A<int>::B; 5124Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5125 MultiTemplateParamsArg TempParams) { 5126 SourceLocation Loc = DS.getSourceRange().getBegin(); 5127 5128 assert(DS.isFriendSpecified()); 5129 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5130 5131 // Try to convert the decl specifier to a type. This works for 5132 // friend templates because ActOnTag never produces a ClassTemplateDecl 5133 // for a TUK_Friend. 5134 Declarator TheDeclarator(DS, Declarator::MemberContext); 5135 TypeSourceInfo *TSI; 5136 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5137 if (TheDeclarator.isInvalidType()) 5138 return DeclPtrTy(); 5139 5140 if (!TSI) 5141 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5142 5143 // This is definitely an error in C++98. It's probably meant to 5144 // be forbidden in C++0x, too, but the specification is just 5145 // poorly written. 5146 // 5147 // The problem is with declarations like the following: 5148 // template <T> friend A<T>::foo; 5149 // where deciding whether a class C is a friend or not now hinges 5150 // on whether there exists an instantiation of A that causes 5151 // 'foo' to equal C. There are restrictions on class-heads 5152 // (which we declare (by fiat) elaborated friend declarations to 5153 // be) that makes this tractable. 5154 // 5155 // FIXME: handle "template <> friend class A<T>;", which 5156 // is possibly well-formed? Who even knows? 5157 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5158 Diag(Loc, diag::err_tagless_friend_type_template) 5159 << DS.getSourceRange(); 5160 return DeclPtrTy(); 5161 } 5162 5163 // C++98 [class.friend]p1: A friend of a class is a function 5164 // or class that is not a member of the class . . . 5165 // This is fixed in DR77, which just barely didn't make the C++03 5166 // deadline. It's also a very silly restriction that seriously 5167 // affects inner classes and which nobody else seems to implement; 5168 // thus we never diagnose it, not even in -pedantic. 5169 // 5170 // But note that we could warn about it: it's always useless to 5171 // friend one of your own members (it's not, however, worthless to 5172 // friend a member of an arbitrary specialization of your template). 5173 5174 Decl *D; 5175 if (unsigned NumTempParamLists = TempParams.size()) 5176 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5177 NumTempParamLists, 5178 (TemplateParameterList**) TempParams.release(), 5179 TSI, 5180 DS.getFriendSpecLoc()); 5181 else 5182 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5183 5184 if (!D) 5185 return DeclPtrTy(); 5186 5187 D->setAccess(AS_public); 5188 CurContext->addDecl(D); 5189 5190 return DeclPtrTy::make(D); 5191} 5192 5193Sema::DeclPtrTy 5194Sema::ActOnFriendFunctionDecl(Scope *S, 5195 Declarator &D, 5196 bool IsDefinition, 5197 MultiTemplateParamsArg TemplateParams) { 5198 const DeclSpec &DS = D.getDeclSpec(); 5199 5200 assert(DS.isFriendSpecified()); 5201 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5202 5203 SourceLocation Loc = D.getIdentifierLoc(); 5204 TypeSourceInfo *TInfo = 0; 5205 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5206 5207 // C++ [class.friend]p1 5208 // A friend of a class is a function or class.... 5209 // Note that this sees through typedefs, which is intended. 5210 // It *doesn't* see through dependent types, which is correct 5211 // according to [temp.arg.type]p3: 5212 // If a declaration acquires a function type through a 5213 // type dependent on a template-parameter and this causes 5214 // a declaration that does not use the syntactic form of a 5215 // function declarator to have a function type, the program 5216 // is ill-formed. 5217 if (!T->isFunctionType()) { 5218 Diag(Loc, diag::err_unexpected_friend); 5219 5220 // It might be worthwhile to try to recover by creating an 5221 // appropriate declaration. 5222 return DeclPtrTy(); 5223 } 5224 5225 // C++ [namespace.memdef]p3 5226 // - If a friend declaration in a non-local class first declares a 5227 // class or function, the friend class or function is a member 5228 // of the innermost enclosing namespace. 5229 // - The name of the friend is not found by simple name lookup 5230 // until a matching declaration is provided in that namespace 5231 // scope (either before or after the class declaration granting 5232 // friendship). 5233 // - If a friend function is called, its name may be found by the 5234 // name lookup that considers functions from namespaces and 5235 // classes associated with the types of the function arguments. 5236 // - When looking for a prior declaration of a class or a function 5237 // declared as a friend, scopes outside the innermost enclosing 5238 // namespace scope are not considered. 5239 5240 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5241 DeclarationName Name = GetNameForDeclarator(D); 5242 assert(Name); 5243 5244 // The context we found the declaration in, or in which we should 5245 // create the declaration. 5246 DeclContext *DC; 5247 5248 // FIXME: handle local classes 5249 5250 // Recover from invalid scope qualifiers as if they just weren't there. 5251 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5252 ForRedeclaration); 5253 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5254 DC = computeDeclContext(ScopeQual); 5255 5256 // FIXME: handle dependent contexts 5257 if (!DC) return DeclPtrTy(); 5258 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5259 5260 LookupQualifiedName(Previous, DC); 5261 5262 // If searching in that context implicitly found a declaration in 5263 // a different context, treat it like it wasn't found at all. 5264 // TODO: better diagnostics for this case. Suggesting the right 5265 // qualified scope would be nice... 5266 // FIXME: getRepresentativeDecl() is not right here at all 5267 if (Previous.empty() || 5268 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5269 D.setInvalidType(); 5270 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5271 return DeclPtrTy(); 5272 } 5273 5274 // C++ [class.friend]p1: A friend of a class is a function or 5275 // class that is not a member of the class . . . 5276 if (DC->Equals(CurContext)) 5277 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5278 5279 // Otherwise walk out to the nearest namespace scope looking for matches. 5280 } else { 5281 // TODO: handle local class contexts. 5282 5283 DC = CurContext; 5284 while (true) { 5285 // Skip class contexts. If someone can cite chapter and verse 5286 // for this behavior, that would be nice --- it's what GCC and 5287 // EDG do, and it seems like a reasonable intent, but the spec 5288 // really only says that checks for unqualified existing 5289 // declarations should stop at the nearest enclosing namespace, 5290 // not that they should only consider the nearest enclosing 5291 // namespace. 5292 while (DC->isRecord()) 5293 DC = DC->getParent(); 5294 5295 LookupQualifiedName(Previous, DC); 5296 5297 // TODO: decide what we think about using declarations. 5298 if (!Previous.empty()) 5299 break; 5300 5301 if (DC->isFileContext()) break; 5302 DC = DC->getParent(); 5303 } 5304 5305 // C++ [class.friend]p1: A friend of a class is a function or 5306 // class that is not a member of the class . . . 5307 // C++0x changes this for both friend types and functions. 5308 // Most C++ 98 compilers do seem to give an error here, so 5309 // we do, too. 5310 if (!Previous.empty() && DC->Equals(CurContext) 5311 && !getLangOptions().CPlusPlus0x) 5312 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5313 } 5314 5315 if (DC->isFileContext()) { 5316 // This implies that it has to be an operator or function. 5317 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5318 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5319 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5320 Diag(Loc, diag::err_introducing_special_friend) << 5321 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5322 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5323 return DeclPtrTy(); 5324 } 5325 } 5326 5327 bool Redeclaration = false; 5328 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5329 move(TemplateParams), 5330 IsDefinition, 5331 Redeclaration); 5332 if (!ND) return DeclPtrTy(); 5333 5334 assert(ND->getDeclContext() == DC); 5335 assert(ND->getLexicalDeclContext() == CurContext); 5336 5337 // Add the function declaration to the appropriate lookup tables, 5338 // adjusting the redeclarations list as necessary. We don't 5339 // want to do this yet if the friending class is dependent. 5340 // 5341 // Also update the scope-based lookup if the target context's 5342 // lookup context is in lexical scope. 5343 if (!CurContext->isDependentContext()) { 5344 DC = DC->getLookupContext(); 5345 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5346 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5347 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5348 } 5349 5350 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5351 D.getIdentifierLoc(), ND, 5352 DS.getFriendSpecLoc()); 5353 FrD->setAccess(AS_public); 5354 CurContext->addDecl(FrD); 5355 5356 return DeclPtrTy::make(ND); 5357} 5358 5359void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5360 AdjustDeclIfTemplate(dcl); 5361 5362 Decl *Dcl = dcl.getAs<Decl>(); 5363 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5364 if (!Fn) { 5365 Diag(DelLoc, diag::err_deleted_non_function); 5366 return; 5367 } 5368 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5369 Diag(DelLoc, diag::err_deleted_decl_not_first); 5370 Diag(Prev->getLocation(), diag::note_previous_declaration); 5371 // If the declaration wasn't the first, we delete the function anyway for 5372 // recovery. 5373 } 5374 Fn->setDeleted(); 5375} 5376 5377static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5378 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5379 ++CI) { 5380 Stmt *SubStmt = *CI; 5381 if (!SubStmt) 5382 continue; 5383 if (isa<ReturnStmt>(SubStmt)) 5384 Self.Diag(SubStmt->getSourceRange().getBegin(), 5385 diag::err_return_in_constructor_handler); 5386 if (!isa<Expr>(SubStmt)) 5387 SearchForReturnInStmt(Self, SubStmt); 5388 } 5389} 5390 5391void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5392 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5393 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5394 SearchForReturnInStmt(*this, Handler); 5395 } 5396} 5397 5398bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5399 const CXXMethodDecl *Old) { 5400 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5401 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5402 5403 if (Context.hasSameType(NewTy, OldTy) || 5404 NewTy->isDependentType() || OldTy->isDependentType()) 5405 return false; 5406 5407 // Check if the return types are covariant 5408 QualType NewClassTy, OldClassTy; 5409 5410 /// Both types must be pointers or references to classes. 5411 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5412 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5413 NewClassTy = NewPT->getPointeeType(); 5414 OldClassTy = OldPT->getPointeeType(); 5415 } 5416 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5417 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5418 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5419 NewClassTy = NewRT->getPointeeType(); 5420 OldClassTy = OldRT->getPointeeType(); 5421 } 5422 } 5423 } 5424 5425 // The return types aren't either both pointers or references to a class type. 5426 if (NewClassTy.isNull()) { 5427 Diag(New->getLocation(), 5428 diag::err_different_return_type_for_overriding_virtual_function) 5429 << New->getDeclName() << NewTy << OldTy; 5430 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5431 5432 return true; 5433 } 5434 5435 // C++ [class.virtual]p6: 5436 // If the return type of D::f differs from the return type of B::f, the 5437 // class type in the return type of D::f shall be complete at the point of 5438 // declaration of D::f or shall be the class type D. 5439 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5440 if (!RT->isBeingDefined() && 5441 RequireCompleteType(New->getLocation(), NewClassTy, 5442 PDiag(diag::err_covariant_return_incomplete) 5443 << New->getDeclName())) 5444 return true; 5445 } 5446 5447 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5448 // Check if the new class derives from the old class. 5449 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5450 Diag(New->getLocation(), 5451 diag::err_covariant_return_not_derived) 5452 << New->getDeclName() << NewTy << OldTy; 5453 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5454 return true; 5455 } 5456 5457 // Check if we the conversion from derived to base is valid. 5458 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5459 diag::err_covariant_return_inaccessible_base, 5460 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5461 // FIXME: Should this point to the return type? 5462 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5463 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5464 return true; 5465 } 5466 } 5467 5468 // The qualifiers of the return types must be the same. 5469 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5470 Diag(New->getLocation(), 5471 diag::err_covariant_return_type_different_qualifications) 5472 << New->getDeclName() << NewTy << OldTy; 5473 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5474 return true; 5475 }; 5476 5477 5478 // The new class type must have the same or less qualifiers as the old type. 5479 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5480 Diag(New->getLocation(), 5481 diag::err_covariant_return_type_class_type_more_qualified) 5482 << New->getDeclName() << NewTy << OldTy; 5483 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5484 return true; 5485 }; 5486 5487 return false; 5488} 5489 5490bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5491 const CXXMethodDecl *Old) 5492{ 5493 if (Old->hasAttr<FinalAttr>()) { 5494 Diag(New->getLocation(), diag::err_final_function_overridden) 5495 << New->getDeclName(); 5496 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5497 return true; 5498 } 5499 5500 return false; 5501} 5502 5503/// \brief Mark the given method pure. 5504/// 5505/// \param Method the method to be marked pure. 5506/// 5507/// \param InitRange the source range that covers the "0" initializer. 5508bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5509 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5510 Method->setPure(); 5511 5512 // A class is abstract if at least one function is pure virtual. 5513 Method->getParent()->setAbstract(true); 5514 return false; 5515 } 5516 5517 if (!Method->isInvalidDecl()) 5518 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5519 << Method->getDeclName() << InitRange; 5520 return true; 5521} 5522 5523/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5524/// an initializer for the out-of-line declaration 'Dcl'. The scope 5525/// is a fresh scope pushed for just this purpose. 5526/// 5527/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5528/// static data member of class X, names should be looked up in the scope of 5529/// class X. 5530void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5531 // If there is no declaration, there was an error parsing it. 5532 Decl *D = Dcl.getAs<Decl>(); 5533 if (D == 0) return; 5534 5535 // We should only get called for declarations with scope specifiers, like: 5536 // int foo::bar; 5537 assert(D->isOutOfLine()); 5538 EnterDeclaratorContext(S, D->getDeclContext()); 5539} 5540 5541/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5542/// initializer for the out-of-line declaration 'Dcl'. 5543void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5544 // If there is no declaration, there was an error parsing it. 5545 Decl *D = Dcl.getAs<Decl>(); 5546 if (D == 0) return; 5547 5548 assert(D->isOutOfLine()); 5549 ExitDeclaratorContext(S); 5550} 5551 5552/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5553/// C++ if/switch/while/for statement. 5554/// e.g: "if (int x = f()) {...}" 5555Action::DeclResult 5556Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5557 // C++ 6.4p2: 5558 // The declarator shall not specify a function or an array. 5559 // The type-specifier-seq shall not contain typedef and shall not declare a 5560 // new class or enumeration. 5561 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5562 "Parser allowed 'typedef' as storage class of condition decl."); 5563 5564 TypeSourceInfo *TInfo = 0; 5565 TagDecl *OwnedTag = 0; 5566 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5567 5568 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5569 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5570 // would be created and CXXConditionDeclExpr wants a VarDecl. 5571 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5572 << D.getSourceRange(); 5573 return DeclResult(); 5574 } else if (OwnedTag && OwnedTag->isDefinition()) { 5575 // The type-specifier-seq shall not declare a new class or enumeration. 5576 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5577 } 5578 5579 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5580 if (!Dcl) 5581 return DeclResult(); 5582 5583 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5584 VD->setDeclaredInCondition(true); 5585 return Dcl; 5586} 5587 5588static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5589 // Ignore dependent types. 5590 if (MD->isDependentContext()) 5591 return false; 5592 5593 // Ignore declarations that are not definitions. 5594 if (!MD->isThisDeclarationADefinition()) 5595 return false; 5596 5597 CXXRecordDecl *RD = MD->getParent(); 5598 5599 // Ignore classes without a vtable. 5600 if (!RD->isDynamicClass()) 5601 return false; 5602 5603 switch (MD->getParent()->getTemplateSpecializationKind()) { 5604 case TSK_Undeclared: 5605 case TSK_ExplicitSpecialization: 5606 // Classes that aren't instantiations of templates don't need their 5607 // virtual methods marked until we see the definition of the key 5608 // function. 5609 break; 5610 5611 case TSK_ImplicitInstantiation: 5612 // This is a constructor of a class template; mark all of the virtual 5613 // members as referenced to ensure that they get instantiatied. 5614 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5615 return true; 5616 break; 5617 5618 case TSK_ExplicitInstantiationDeclaration: 5619 return false; 5620 5621 case TSK_ExplicitInstantiationDefinition: 5622 // This is method of a explicit instantiation; mark all of the virtual 5623 // members as referenced to ensure that they get instantiatied. 5624 return true; 5625 } 5626 5627 // Consider only out-of-line definitions of member functions. When we see 5628 // an inline definition, it's too early to compute the key function. 5629 if (!MD->isOutOfLine()) 5630 return false; 5631 5632 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5633 5634 // If there is no key function, we will need a copy of the vtable. 5635 if (!KeyFunction) 5636 return true; 5637 5638 // If this is the key function, we need to mark virtual members. 5639 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5640 return true; 5641 5642 return false; 5643} 5644 5645void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5646 CXXMethodDecl *MD) { 5647 CXXRecordDecl *RD = MD->getParent(); 5648 5649 // We will need to mark all of the virtual members as referenced to build the 5650 // vtable. 5651 if (!needsVTable(MD, Context)) 5652 return; 5653 5654 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5655 if (kind == TSK_ImplicitInstantiation) 5656 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5657 else 5658 MarkVirtualMembersReferenced(Loc, RD); 5659} 5660 5661bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5662 if (ClassesWithUnmarkedVirtualMembers.empty()) 5663 return false; 5664 5665 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5666 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5667 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5668 ClassesWithUnmarkedVirtualMembers.pop_back(); 5669 MarkVirtualMembersReferenced(Loc, RD); 5670 } 5671 5672 return true; 5673} 5674 5675void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5676 const CXXRecordDecl *RD) { 5677 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5678 e = RD->method_end(); i != e; ++i) { 5679 CXXMethodDecl *MD = *i; 5680 5681 // C++ [basic.def.odr]p2: 5682 // [...] A virtual member function is used if it is not pure. [...] 5683 if (MD->isVirtual() && !MD->isPure()) 5684 MarkDeclarationReferenced(Loc, MD); 5685 } 5686 5687 // Only classes that have virtual bases need a VTT. 5688 if (RD->getNumVBases() == 0) 5689 return; 5690 5691 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5692 e = RD->bases_end(); i != e; ++i) { 5693 const CXXRecordDecl *Base = 5694 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5695 if (i->isVirtual()) 5696 continue; 5697 if (Base->getNumVBases() == 0) 5698 continue; 5699 MarkVirtualMembersReferenced(Loc, Base); 5700 } 5701} 5702 5703/// SetIvarInitializers - This routine builds initialization ASTs for the 5704/// Objective-C implementation whose ivars need be initialized. 5705void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 5706 if (!getLangOptions().CPlusPlus) 5707 return; 5708 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 5709 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 5710 CollectIvarsToConstructOrDestruct(OID, ivars); 5711 if (ivars.empty()) 5712 return; 5713 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 5714 for (unsigned i = 0; i < ivars.size(); i++) { 5715 FieldDecl *Field = ivars[i]; 5716 CXXBaseOrMemberInitializer *Member; 5717 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 5718 InitializationKind InitKind = 5719 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 5720 5721 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 5722 Sema::OwningExprResult MemberInit = 5723 InitSeq.Perform(*this, InitEntity, InitKind, 5724 Sema::MultiExprArg(*this, 0, 0)); 5725 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 5726 // Note, MemberInit could actually come back empty if no initialization 5727 // is required (e.g., because it would call a trivial default constructor) 5728 if (!MemberInit.get() || MemberInit.isInvalid()) 5729 continue; 5730 5731 Member = 5732 new (Context) CXXBaseOrMemberInitializer(Context, 5733 Field, SourceLocation(), 5734 SourceLocation(), 5735 MemberInit.takeAs<Expr>(), 5736 SourceLocation()); 5737 AllToInit.push_back(Member); 5738 } 5739 ObjCImplementation->setIvarInitializers(Context, 5740 AllToInit.data(), AllToInit.size()); 5741 } 5742} 5743