SemaDeclCXX.cpp revision e127abe8bbcff7fef0326d68731bc178182a9990
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 714 CXXBaseSpecifierArray &BasePathArray) { 715 assert(BasePathArray.empty() && "Base path array must be empty!"); 716 assert(Paths.isRecordingPaths() && "Must record paths!"); 717 718 const CXXBasePath &Path = Paths.front(); 719 720 // We first go backward and check if we have a virtual base. 721 // FIXME: It would be better if CXXBasePath had the base specifier for 722 // the nearest virtual base. 723 unsigned Start = 0; 724 for (unsigned I = Path.size(); I != 0; --I) { 725 if (Path[I - 1].Base->isVirtual()) { 726 Start = I - 1; 727 break; 728 } 729 } 730 731 // Now add all bases. 732 for (unsigned I = Start, E = Path.size(); I != E; ++I) 733 BasePathArray.push_back(Path[I].Base); 734} 735 736/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 737/// conversion (where Derived and Base are class types) is 738/// well-formed, meaning that the conversion is unambiguous (and 739/// that all of the base classes are accessible). Returns true 740/// and emits a diagnostic if the code is ill-formed, returns false 741/// otherwise. Loc is the location where this routine should point to 742/// if there is an error, and Range is the source range to highlight 743/// if there is an error. 744bool 745Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 746 unsigned InaccessibleBaseID, 747 unsigned AmbigiousBaseConvID, 748 SourceLocation Loc, SourceRange Range, 749 DeclarationName Name, 750 CXXBaseSpecifierArray *BasePath) { 751 // First, determine whether the path from Derived to Base is 752 // ambiguous. This is slightly more expensive than checking whether 753 // the Derived to Base conversion exists, because here we need to 754 // explore multiple paths to determine if there is an ambiguity. 755 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 756 /*DetectVirtual=*/false); 757 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 758 assert(DerivationOkay && 759 "Can only be used with a derived-to-base conversion"); 760 (void)DerivationOkay; 761 762 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 763 if (InaccessibleBaseID) { 764 // Check that the base class can be accessed. 765 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 766 InaccessibleBaseID)) { 767 case AR_inaccessible: 768 return true; 769 case AR_accessible: 770 case AR_dependent: 771 case AR_delayed: 772 break; 773 } 774 } 775 776 // Build a base path if necessary. 777 if (BasePath) 778 BuildBasePathArray(Paths, *BasePath); 779 return false; 780 } 781 782 // We know that the derived-to-base conversion is ambiguous, and 783 // we're going to produce a diagnostic. Perform the derived-to-base 784 // search just one more time to compute all of the possible paths so 785 // that we can print them out. This is more expensive than any of 786 // the previous derived-to-base checks we've done, but at this point 787 // performance isn't as much of an issue. 788 Paths.clear(); 789 Paths.setRecordingPaths(true); 790 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 791 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 792 (void)StillOkay; 793 794 // Build up a textual representation of the ambiguous paths, e.g., 795 // D -> B -> A, that will be used to illustrate the ambiguous 796 // conversions in the diagnostic. We only print one of the paths 797 // to each base class subobject. 798 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 799 800 Diag(Loc, AmbigiousBaseConvID) 801 << Derived << Base << PathDisplayStr << Range << Name; 802 return true; 803} 804 805bool 806Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 807 SourceLocation Loc, SourceRange Range, 808 CXXBaseSpecifierArray *BasePath, 809 bool IgnoreAccess) { 810 return CheckDerivedToBaseConversion(Derived, Base, 811 IgnoreAccess ? 0 812 : diag::err_upcast_to_inaccessible_base, 813 diag::err_ambiguous_derived_to_base_conv, 814 Loc, Range, DeclarationName(), 815 BasePath); 816} 817 818 819/// @brief Builds a string representing ambiguous paths from a 820/// specific derived class to different subobjects of the same base 821/// class. 822/// 823/// This function builds a string that can be used in error messages 824/// to show the different paths that one can take through the 825/// inheritance hierarchy to go from the derived class to different 826/// subobjects of a base class. The result looks something like this: 827/// @code 828/// struct D -> struct B -> struct A 829/// struct D -> struct C -> struct A 830/// @endcode 831std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 832 std::string PathDisplayStr; 833 std::set<unsigned> DisplayedPaths; 834 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 835 Path != Paths.end(); ++Path) { 836 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 837 // We haven't displayed a path to this particular base 838 // class subobject yet. 839 PathDisplayStr += "\n "; 840 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 841 for (CXXBasePath::const_iterator Element = Path->begin(); 842 Element != Path->end(); ++Element) 843 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 844 } 845 } 846 847 return PathDisplayStr; 848} 849 850//===----------------------------------------------------------------------===// 851// C++ class member Handling 852//===----------------------------------------------------------------------===// 853 854/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 855/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 856/// bitfield width if there is one and 'InitExpr' specifies the initializer if 857/// any. 858Sema::DeclPtrTy 859Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 860 MultiTemplateParamsArg TemplateParameterLists, 861 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 862 bool Deleted) { 863 const DeclSpec &DS = D.getDeclSpec(); 864 DeclarationName Name = GetNameForDeclarator(D); 865 Expr *BitWidth = static_cast<Expr*>(BW); 866 Expr *Init = static_cast<Expr*>(InitExpr); 867 SourceLocation Loc = D.getIdentifierLoc(); 868 869 bool isFunc = D.isFunctionDeclarator(); 870 871 assert(!DS.isFriendSpecified()); 872 873 // C++ 9.2p6: A member shall not be declared to have automatic storage 874 // duration (auto, register) or with the extern storage-class-specifier. 875 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 876 // data members and cannot be applied to names declared const or static, 877 // and cannot be applied to reference members. 878 switch (DS.getStorageClassSpec()) { 879 case DeclSpec::SCS_unspecified: 880 case DeclSpec::SCS_typedef: 881 case DeclSpec::SCS_static: 882 // FALL THROUGH. 883 break; 884 case DeclSpec::SCS_mutable: 885 if (isFunc) { 886 if (DS.getStorageClassSpecLoc().isValid()) 887 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 888 else 889 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 890 891 // FIXME: It would be nicer if the keyword was ignored only for this 892 // declarator. Otherwise we could get follow-up errors. 893 D.getMutableDeclSpec().ClearStorageClassSpecs(); 894 } else { 895 QualType T = GetTypeForDeclarator(D, S); 896 diag::kind err = static_cast<diag::kind>(0); 897 if (T->isReferenceType()) 898 err = diag::err_mutable_reference; 899 else if (T.isConstQualified()) 900 err = diag::err_mutable_const; 901 if (err != 0) { 902 if (DS.getStorageClassSpecLoc().isValid()) 903 Diag(DS.getStorageClassSpecLoc(), err); 904 else 905 Diag(DS.getThreadSpecLoc(), err); 906 // FIXME: It would be nicer if the keyword was ignored only for this 907 // declarator. Otherwise we could get follow-up errors. 908 D.getMutableDeclSpec().ClearStorageClassSpecs(); 909 } 910 } 911 break; 912 default: 913 if (DS.getStorageClassSpecLoc().isValid()) 914 Diag(DS.getStorageClassSpecLoc(), 915 diag::err_storageclass_invalid_for_member); 916 else 917 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 918 D.getMutableDeclSpec().ClearStorageClassSpecs(); 919 } 920 921 if (!isFunc && 922 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 923 D.getNumTypeObjects() == 0) { 924 // Check also for this case: 925 // 926 // typedef int f(); 927 // f a; 928 // 929 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 930 isFunc = TDType->isFunctionType(); 931 } 932 933 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 934 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 935 !isFunc); 936 937 Decl *Member; 938 if (isInstField) { 939 // FIXME: Check for template parameters! 940 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 941 AS); 942 assert(Member && "HandleField never returns null"); 943 } else { 944 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 945 .getAs<Decl>(); 946 if (!Member) { 947 if (BitWidth) DeleteExpr(BitWidth); 948 return DeclPtrTy(); 949 } 950 951 // Non-instance-fields can't have a bitfield. 952 if (BitWidth) { 953 if (Member->isInvalidDecl()) { 954 // don't emit another diagnostic. 955 } else if (isa<VarDecl>(Member)) { 956 // C++ 9.6p3: A bit-field shall not be a static member. 957 // "static member 'A' cannot be a bit-field" 958 Diag(Loc, diag::err_static_not_bitfield) 959 << Name << BitWidth->getSourceRange(); 960 } else if (isa<TypedefDecl>(Member)) { 961 // "typedef member 'x' cannot be a bit-field" 962 Diag(Loc, diag::err_typedef_not_bitfield) 963 << Name << BitWidth->getSourceRange(); 964 } else { 965 // A function typedef ("typedef int f(); f a;"). 966 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 967 Diag(Loc, diag::err_not_integral_type_bitfield) 968 << Name << cast<ValueDecl>(Member)->getType() 969 << BitWidth->getSourceRange(); 970 } 971 972 DeleteExpr(BitWidth); 973 BitWidth = 0; 974 Member->setInvalidDecl(); 975 } 976 977 Member->setAccess(AS); 978 979 // If we have declared a member function template, set the access of the 980 // templated declaration as well. 981 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 982 FunTmpl->getTemplatedDecl()->setAccess(AS); 983 } 984 985 assert((Name || isInstField) && "No identifier for non-field ?"); 986 987 if (Init) 988 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 989 if (Deleted) // FIXME: Source location is not very good. 990 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 991 992 if (isInstField) { 993 FieldCollector->Add(cast<FieldDecl>(Member)); 994 return DeclPtrTy(); 995 } 996 return DeclPtrTy::make(Member); 997} 998 999/// \brief Find the direct and/or virtual base specifiers that 1000/// correspond to the given base type, for use in base initialization 1001/// within a constructor. 1002static bool FindBaseInitializer(Sema &SemaRef, 1003 CXXRecordDecl *ClassDecl, 1004 QualType BaseType, 1005 const CXXBaseSpecifier *&DirectBaseSpec, 1006 const CXXBaseSpecifier *&VirtualBaseSpec) { 1007 // First, check for a direct base class. 1008 DirectBaseSpec = 0; 1009 for (CXXRecordDecl::base_class_const_iterator Base 1010 = ClassDecl->bases_begin(); 1011 Base != ClassDecl->bases_end(); ++Base) { 1012 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1013 // We found a direct base of this type. That's what we're 1014 // initializing. 1015 DirectBaseSpec = &*Base; 1016 break; 1017 } 1018 } 1019 1020 // Check for a virtual base class. 1021 // FIXME: We might be able to short-circuit this if we know in advance that 1022 // there are no virtual bases. 1023 VirtualBaseSpec = 0; 1024 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1025 // We haven't found a base yet; search the class hierarchy for a 1026 // virtual base class. 1027 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1028 /*DetectVirtual=*/false); 1029 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1030 BaseType, Paths)) { 1031 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1032 Path != Paths.end(); ++Path) { 1033 if (Path->back().Base->isVirtual()) { 1034 VirtualBaseSpec = Path->back().Base; 1035 break; 1036 } 1037 } 1038 } 1039 } 1040 1041 return DirectBaseSpec || VirtualBaseSpec; 1042} 1043 1044/// ActOnMemInitializer - Handle a C++ member initializer. 1045Sema::MemInitResult 1046Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1047 Scope *S, 1048 CXXScopeSpec &SS, 1049 IdentifierInfo *MemberOrBase, 1050 TypeTy *TemplateTypeTy, 1051 SourceLocation IdLoc, 1052 SourceLocation LParenLoc, 1053 ExprTy **Args, unsigned NumArgs, 1054 SourceLocation *CommaLocs, 1055 SourceLocation RParenLoc) { 1056 if (!ConstructorD) 1057 return true; 1058 1059 AdjustDeclIfTemplate(ConstructorD); 1060 1061 CXXConstructorDecl *Constructor 1062 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1063 if (!Constructor) { 1064 // The user wrote a constructor initializer on a function that is 1065 // not a C++ constructor. Ignore the error for now, because we may 1066 // have more member initializers coming; we'll diagnose it just 1067 // once in ActOnMemInitializers. 1068 return true; 1069 } 1070 1071 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1072 1073 // C++ [class.base.init]p2: 1074 // Names in a mem-initializer-id are looked up in the scope of the 1075 // constructor’s class and, if not found in that scope, are looked 1076 // up in the scope containing the constructor’s 1077 // definition. [Note: if the constructor’s class contains a member 1078 // with the same name as a direct or virtual base class of the 1079 // class, a mem-initializer-id naming the member or base class and 1080 // composed of a single identifier refers to the class member. A 1081 // mem-initializer-id for the hidden base class may be specified 1082 // using a qualified name. ] 1083 if (!SS.getScopeRep() && !TemplateTypeTy) { 1084 // Look for a member, first. 1085 FieldDecl *Member = 0; 1086 DeclContext::lookup_result Result 1087 = ClassDecl->lookup(MemberOrBase); 1088 if (Result.first != Result.second) 1089 Member = dyn_cast<FieldDecl>(*Result.first); 1090 1091 // FIXME: Handle members of an anonymous union. 1092 1093 if (Member) 1094 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1095 LParenLoc, RParenLoc); 1096 } 1097 // It didn't name a member, so see if it names a class. 1098 QualType BaseType; 1099 TypeSourceInfo *TInfo = 0; 1100 1101 if (TemplateTypeTy) { 1102 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1103 } else { 1104 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1105 LookupParsedName(R, S, &SS); 1106 1107 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1108 if (!TyD) { 1109 if (R.isAmbiguous()) return true; 1110 1111 // We don't want access-control diagnostics here. 1112 R.suppressDiagnostics(); 1113 1114 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1115 bool NotUnknownSpecialization = false; 1116 DeclContext *DC = computeDeclContext(SS, false); 1117 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1118 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1119 1120 if (!NotUnknownSpecialization) { 1121 // When the scope specifier can refer to a member of an unknown 1122 // specialization, we take it as a type name. 1123 BaseType = CheckTypenameType(ETK_None, 1124 (NestedNameSpecifier *)SS.getScopeRep(), 1125 *MemberOrBase, SS.getRange()); 1126 if (BaseType.isNull()) 1127 return true; 1128 1129 R.clear(); 1130 } 1131 } 1132 1133 // If no results were found, try to correct typos. 1134 if (R.empty() && BaseType.isNull() && 1135 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1136 R.isSingleResult()) { 1137 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1138 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1139 // We have found a non-static data member with a similar 1140 // name to what was typed; complain and initialize that 1141 // member. 1142 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1143 << MemberOrBase << true << R.getLookupName() 1144 << FixItHint::CreateReplacement(R.getNameLoc(), 1145 R.getLookupName().getAsString()); 1146 Diag(Member->getLocation(), diag::note_previous_decl) 1147 << Member->getDeclName(); 1148 1149 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1150 LParenLoc, RParenLoc); 1151 } 1152 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1153 const CXXBaseSpecifier *DirectBaseSpec; 1154 const CXXBaseSpecifier *VirtualBaseSpec; 1155 if (FindBaseInitializer(*this, ClassDecl, 1156 Context.getTypeDeclType(Type), 1157 DirectBaseSpec, VirtualBaseSpec)) { 1158 // We have found a direct or virtual base class with a 1159 // similar name to what was typed; complain and initialize 1160 // that base class. 1161 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1162 << MemberOrBase << false << R.getLookupName() 1163 << FixItHint::CreateReplacement(R.getNameLoc(), 1164 R.getLookupName().getAsString()); 1165 1166 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1167 : VirtualBaseSpec; 1168 Diag(BaseSpec->getSourceRange().getBegin(), 1169 diag::note_base_class_specified_here) 1170 << BaseSpec->getType() 1171 << BaseSpec->getSourceRange(); 1172 1173 TyD = Type; 1174 } 1175 } 1176 } 1177 1178 if (!TyD && BaseType.isNull()) { 1179 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1180 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1181 return true; 1182 } 1183 } 1184 1185 if (BaseType.isNull()) { 1186 BaseType = Context.getTypeDeclType(TyD); 1187 if (SS.isSet()) { 1188 NestedNameSpecifier *Qualifier = 1189 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1190 1191 // FIXME: preserve source range information 1192 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1193 } 1194 } 1195 } 1196 1197 if (!TInfo) 1198 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1199 1200 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1201 LParenLoc, RParenLoc, ClassDecl); 1202} 1203 1204/// Checks an initializer expression for use of uninitialized fields, such as 1205/// containing the field that is being initialized. Returns true if there is an 1206/// uninitialized field was used an updates the SourceLocation parameter; false 1207/// otherwise. 1208static bool InitExprContainsUninitializedFields(const Stmt* S, 1209 const FieldDecl* LhsField, 1210 SourceLocation* L) { 1211 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1212 if (ME) { 1213 const NamedDecl* RhsField = ME->getMemberDecl(); 1214 if (RhsField == LhsField) { 1215 // Initializing a field with itself. Throw a warning. 1216 // But wait; there are exceptions! 1217 // Exception #1: The field may not belong to this record. 1218 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1219 const Expr* base = ME->getBase(); 1220 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1221 // Even though the field matches, it does not belong to this record. 1222 return false; 1223 } 1224 // None of the exceptions triggered; return true to indicate an 1225 // uninitialized field was used. 1226 *L = ME->getMemberLoc(); 1227 return true; 1228 } 1229 } 1230 bool found = false; 1231 for (Stmt::const_child_iterator it = S->child_begin(); 1232 it != S->child_end() && found == false; 1233 ++it) { 1234 if (isa<CallExpr>(S)) { 1235 // Do not descend into function calls or constructors, as the use 1236 // of an uninitialized field may be valid. One would have to inspect 1237 // the contents of the function/ctor to determine if it is safe or not. 1238 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1239 // may be safe, depending on what the function/ctor does. 1240 continue; 1241 } 1242 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1243 } 1244 return found; 1245} 1246 1247Sema::MemInitResult 1248Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1249 unsigned NumArgs, SourceLocation IdLoc, 1250 SourceLocation LParenLoc, 1251 SourceLocation RParenLoc) { 1252 // Diagnose value-uses of fields to initialize themselves, e.g. 1253 // foo(foo) 1254 // where foo is not also a parameter to the constructor. 1255 // TODO: implement -Wuninitialized and fold this into that framework. 1256 for (unsigned i = 0; i < NumArgs; ++i) { 1257 SourceLocation L; 1258 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1259 // FIXME: Return true in the case when other fields are used before being 1260 // uninitialized. For example, let this field be the i'th field. When 1261 // initializing the i'th field, throw a warning if any of the >= i'th 1262 // fields are used, as they are not yet initialized. 1263 // Right now we are only handling the case where the i'th field uses 1264 // itself in its initializer. 1265 Diag(L, diag::warn_field_is_uninit); 1266 } 1267 } 1268 1269 bool HasDependentArg = false; 1270 for (unsigned i = 0; i < NumArgs; i++) 1271 HasDependentArg |= Args[i]->isTypeDependent(); 1272 1273 QualType FieldType = Member->getType(); 1274 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1275 FieldType = Array->getElementType(); 1276 if (FieldType->isDependentType() || HasDependentArg) { 1277 // Can't check initialization for a member of dependent type or when 1278 // any of the arguments are type-dependent expressions. 1279 OwningExprResult Init 1280 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1281 RParenLoc)); 1282 1283 // Erase any temporaries within this evaluation context; we're not 1284 // going to track them in the AST, since we'll be rebuilding the 1285 // ASTs during template instantiation. 1286 ExprTemporaries.erase( 1287 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1288 ExprTemporaries.end()); 1289 1290 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1291 LParenLoc, 1292 Init.takeAs<Expr>(), 1293 RParenLoc); 1294 1295 } 1296 1297 if (Member->isInvalidDecl()) 1298 return true; 1299 1300 // Initialize the member. 1301 InitializedEntity MemberEntity = 1302 InitializedEntity::InitializeMember(Member, 0); 1303 InitializationKind Kind = 1304 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1305 1306 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1307 1308 OwningExprResult MemberInit = 1309 InitSeq.Perform(*this, MemberEntity, Kind, 1310 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1311 if (MemberInit.isInvalid()) 1312 return true; 1313 1314 // C++0x [class.base.init]p7: 1315 // The initialization of each base and member constitutes a 1316 // full-expression. 1317 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1318 if (MemberInit.isInvalid()) 1319 return true; 1320 1321 // If we are in a dependent context, template instantiation will 1322 // perform this type-checking again. Just save the arguments that we 1323 // received in a ParenListExpr. 1324 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1325 // of the information that we have about the member 1326 // initializer. However, deconstructing the ASTs is a dicey process, 1327 // and this approach is far more likely to get the corner cases right. 1328 if (CurContext->isDependentContext()) { 1329 // Bump the reference count of all of the arguments. 1330 for (unsigned I = 0; I != NumArgs; ++I) 1331 Args[I]->Retain(); 1332 1333 OwningExprResult Init 1334 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1335 RParenLoc)); 1336 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1337 LParenLoc, 1338 Init.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1343 LParenLoc, 1344 MemberInit.takeAs<Expr>(), 1345 RParenLoc); 1346} 1347 1348Sema::MemInitResult 1349Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1350 Expr **Args, unsigned NumArgs, 1351 SourceLocation LParenLoc, SourceLocation RParenLoc, 1352 CXXRecordDecl *ClassDecl) { 1353 bool HasDependentArg = false; 1354 for (unsigned i = 0; i < NumArgs; i++) 1355 HasDependentArg |= Args[i]->isTypeDependent(); 1356 1357 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1358 if (BaseType->isDependentType() || HasDependentArg) { 1359 // Can't check initialization for a base of dependent type or when 1360 // any of the arguments are type-dependent expressions. 1361 OwningExprResult BaseInit 1362 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1363 RParenLoc)); 1364 1365 // Erase any temporaries within this evaluation context; we're not 1366 // going to track them in the AST, since we'll be rebuilding the 1367 // ASTs during template instantiation. 1368 ExprTemporaries.erase( 1369 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1370 ExprTemporaries.end()); 1371 1372 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1373 /*IsVirtual=*/false, 1374 LParenLoc, 1375 BaseInit.takeAs<Expr>(), 1376 RParenLoc); 1377 } 1378 1379 if (!BaseType->isRecordType()) 1380 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1381 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1382 1383 // C++ [class.base.init]p2: 1384 // [...] Unless the mem-initializer-id names a nonstatic data 1385 // member of the constructor’s class or a direct or virtual base 1386 // of that class, the mem-initializer is ill-formed. A 1387 // mem-initializer-list can initialize a base class using any 1388 // name that denotes that base class type. 1389 1390 // Check for direct and virtual base classes. 1391 const CXXBaseSpecifier *DirectBaseSpec = 0; 1392 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1393 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1394 VirtualBaseSpec); 1395 1396 // C++ [base.class.init]p2: 1397 // If a mem-initializer-id is ambiguous because it designates both 1398 // a direct non-virtual base class and an inherited virtual base 1399 // class, the mem-initializer is ill-formed. 1400 if (DirectBaseSpec && VirtualBaseSpec) 1401 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1402 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1403 // C++ [base.class.init]p2: 1404 // Unless the mem-initializer-id names a nonstatic data membeer of the 1405 // constructor's class ot a direst or virtual base of that class, the 1406 // mem-initializer is ill-formed. 1407 if (!DirectBaseSpec && !VirtualBaseSpec) 1408 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1409 << BaseType << ClassDecl->getNameAsCString() 1410 << BaseTInfo->getTypeLoc().getSourceRange(); 1411 1412 CXXBaseSpecifier *BaseSpec 1413 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1414 if (!BaseSpec) 1415 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1416 1417 // Initialize the base. 1418 InitializedEntity BaseEntity = 1419 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1420 InitializationKind Kind = 1421 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1422 1423 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1424 1425 OwningExprResult BaseInit = 1426 InitSeq.Perform(*this, BaseEntity, Kind, 1427 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1428 if (BaseInit.isInvalid()) 1429 return true; 1430 1431 // C++0x [class.base.init]p7: 1432 // The initialization of each base and member constitutes a 1433 // full-expression. 1434 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1435 if (BaseInit.isInvalid()) 1436 return true; 1437 1438 // If we are in a dependent context, template instantiation will 1439 // perform this type-checking again. Just save the arguments that we 1440 // received in a ParenListExpr. 1441 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1442 // of the information that we have about the base 1443 // initializer. However, deconstructing the ASTs is a dicey process, 1444 // and this approach is far more likely to get the corner cases right. 1445 if (CurContext->isDependentContext()) { 1446 // Bump the reference count of all of the arguments. 1447 for (unsigned I = 0; I != NumArgs; ++I) 1448 Args[I]->Retain(); 1449 1450 OwningExprResult Init 1451 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1452 RParenLoc)); 1453 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1454 BaseSpec->isVirtual(), 1455 LParenLoc, 1456 Init.takeAs<Expr>(), 1457 RParenLoc); 1458 } 1459 1460 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1461 BaseSpec->isVirtual(), 1462 LParenLoc, 1463 BaseInit.takeAs<Expr>(), 1464 RParenLoc); 1465} 1466 1467/// ImplicitInitializerKind - How an implicit base or member initializer should 1468/// initialize its base or member. 1469enum ImplicitInitializerKind { 1470 IIK_Default, 1471 IIK_Copy, 1472 IIK_Move 1473}; 1474 1475static bool 1476BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1477 ImplicitInitializerKind ImplicitInitKind, 1478 CXXBaseSpecifier *BaseSpec, 1479 bool IsInheritedVirtualBase, 1480 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1481 InitializedEntity InitEntity 1482 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1483 IsInheritedVirtualBase); 1484 1485 Sema::OwningExprResult BaseInit(SemaRef); 1486 1487 switch (ImplicitInitKind) { 1488 case IIK_Default: { 1489 InitializationKind InitKind 1490 = InitializationKind::CreateDefault(Constructor->getLocation()); 1491 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1492 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1493 Sema::MultiExprArg(SemaRef, 0, 0)); 1494 break; 1495 } 1496 1497 case IIK_Copy: { 1498 ParmVarDecl *Param = Constructor->getParamDecl(0); 1499 QualType ParamType = Param->getType().getNonReferenceType(); 1500 1501 Expr *CopyCtorArg = 1502 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1503 SourceLocation(), ParamType, 0); 1504 1505 // Cast to the base class to avoid ambiguities. 1506 CXXBaseSpecifierArray BasePath; 1507 BasePath.push_back(BaseSpec); 1508 SemaRef.ImpCastExprToType(CopyCtorArg, BaseSpec->getType(), 1509 CastExpr::CK_UncheckedDerivedToBase, 1510 /*isLvalue=*/true, BasePath); 1511 1512 InitializationKind InitKind 1513 = InitializationKind::CreateDirect(Constructor->getLocation(), 1514 SourceLocation(), SourceLocation()); 1515 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1516 &CopyCtorArg, 1); 1517 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1518 Sema::MultiExprArg(SemaRef, 1519 (void**)&CopyCtorArg, 1)); 1520 break; 1521 } 1522 1523 case IIK_Move: 1524 assert(false && "Unhandled initializer kind!"); 1525 } 1526 1527 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1528 if (BaseInit.isInvalid()) 1529 return true; 1530 1531 CXXBaseInit = 1532 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1533 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1534 SourceLocation()), 1535 BaseSpec->isVirtual(), 1536 SourceLocation(), 1537 BaseInit.takeAs<Expr>(), 1538 SourceLocation()); 1539 1540 return false; 1541} 1542 1543static bool 1544BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1545 ImplicitInitializerKind ImplicitInitKind, 1546 FieldDecl *Field, 1547 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1548 if (ImplicitInitKind == IIK_Copy) { 1549 // FIXME: We shouldn't return early here. The reason we do it is that 1550 // we don't handle copying arrays. 1551 CXXMemberInit = 0; 1552 return false; 1553 1554 ParmVarDecl *Param = Constructor->getParamDecl(0); 1555 QualType ParamType = Param->getType().getNonReferenceType(); 1556 1557 Expr *MemberExprBase = 1558 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1559 SourceLocation(), ParamType, 0); 1560 1561 1562 Expr *CopyCtorArg = 1563 MemberExpr::Create(SemaRef.Context, MemberExprBase, /*IsArrow=*/false, 1564 0, SourceRange(), Field, 1565 DeclAccessPair::make(Field, Field->getAccess()), 1566 SourceLocation(), 0, 1567 Field->getType().getNonReferenceType()); 1568 1569 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1570 InitializationKind InitKind = 1571 InitializationKind::CreateDirect(Constructor->getLocation(), 1572 SourceLocation(), SourceLocation()); 1573 1574 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1575 &CopyCtorArg, 1); 1576 1577 Sema::OwningExprResult MemberInit = 1578 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1579 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArg, 1), 0); 1580 if (MemberInit.isInvalid()) 1581 return true; 1582 1583 CXXMemberInit = 0; 1584 return false; 1585 } 1586 1587 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1588 1589 QualType FieldBaseElementType = 1590 SemaRef.Context.getBaseElementType(Field->getType()); 1591 1592 if (FieldBaseElementType->isRecordType()) { 1593 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1594 InitializationKind InitKind = 1595 InitializationKind::CreateDefault(Constructor->getLocation()); 1596 1597 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1598 Sema::OwningExprResult MemberInit = 1599 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1600 Sema::MultiExprArg(SemaRef, 0, 0)); 1601 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1602 if (MemberInit.isInvalid()) 1603 return true; 1604 1605 CXXMemberInit = 1606 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1607 Field, SourceLocation(), 1608 SourceLocation(), 1609 MemberInit.takeAs<Expr>(), 1610 SourceLocation()); 1611 return false; 1612 } 1613 1614 if (FieldBaseElementType->isReferenceType()) { 1615 SemaRef.Diag(Constructor->getLocation(), 1616 diag::err_uninitialized_member_in_ctor) 1617 << (int)Constructor->isImplicit() 1618 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1619 << 0 << Field->getDeclName(); 1620 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1621 return true; 1622 } 1623 1624 if (FieldBaseElementType.isConstQualified()) { 1625 SemaRef.Diag(Constructor->getLocation(), 1626 diag::err_uninitialized_member_in_ctor) 1627 << (int)Constructor->isImplicit() 1628 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1629 << 1 << Field->getDeclName(); 1630 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1631 return true; 1632 } 1633 1634 // Nothing to initialize. 1635 CXXMemberInit = 0; 1636 return false; 1637} 1638 1639bool 1640Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1641 CXXBaseOrMemberInitializer **Initializers, 1642 unsigned NumInitializers, 1643 bool AnyErrors) { 1644 if (Constructor->getDeclContext()->isDependentContext()) { 1645 // Just store the initializers as written, they will be checked during 1646 // instantiation. 1647 if (NumInitializers > 0) { 1648 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1649 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1650 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1651 memcpy(baseOrMemberInitializers, Initializers, 1652 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1653 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1654 } 1655 1656 return false; 1657 } 1658 1659 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1660 1661 // FIXME: Handle implicit move constructors. 1662 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1663 ImplicitInitKind = IIK_Copy; 1664 1665 // We need to build the initializer AST according to order of construction 1666 // and not what user specified in the Initializers list. 1667 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1668 if (!ClassDecl) 1669 return true; 1670 1671 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1672 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1673 bool HadError = false; 1674 1675 for (unsigned i = 0; i < NumInitializers; i++) { 1676 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1677 1678 if (Member->isBaseInitializer()) 1679 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1680 else 1681 AllBaseFields[Member->getMember()] = Member; 1682 } 1683 1684 // Keep track of the direct virtual bases. 1685 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1686 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1687 E = ClassDecl->bases_end(); I != E; ++I) { 1688 if (I->isVirtual()) 1689 DirectVBases.insert(I); 1690 } 1691 1692 // Push virtual bases before others. 1693 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1694 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1695 1696 if (CXXBaseOrMemberInitializer *Value 1697 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1698 AllToInit.push_back(Value); 1699 } else if (!AnyErrors) { 1700 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1701 CXXBaseOrMemberInitializer *CXXBaseInit; 1702 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1703 VBase, IsInheritedVirtualBase, 1704 CXXBaseInit)) { 1705 HadError = true; 1706 continue; 1707 } 1708 1709 AllToInit.push_back(CXXBaseInit); 1710 } 1711 } 1712 1713 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1714 E = ClassDecl->bases_end(); Base != E; ++Base) { 1715 // Virtuals are in the virtual base list and already constructed. 1716 if (Base->isVirtual()) 1717 continue; 1718 1719 if (CXXBaseOrMemberInitializer *Value 1720 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1721 AllToInit.push_back(Value); 1722 } else if (!AnyErrors) { 1723 CXXBaseOrMemberInitializer *CXXBaseInit; 1724 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1725 Base, /*IsInheritedVirtualBase=*/false, 1726 CXXBaseInit)) { 1727 HadError = true; 1728 continue; 1729 } 1730 1731 AllToInit.push_back(CXXBaseInit); 1732 } 1733 } 1734 1735 // non-static data members. 1736 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1737 E = ClassDecl->field_end(); Field != E; ++Field) { 1738 if ((*Field)->isAnonymousStructOrUnion()) { 1739 if (const RecordType *FieldClassType = 1740 Field->getType()->getAs<RecordType>()) { 1741 CXXRecordDecl *FieldClassDecl 1742 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1743 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1744 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1745 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1746 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1747 // set to the anonymous union data member used in the initializer 1748 // list. 1749 Value->setMember(*Field); 1750 Value->setAnonUnionMember(*FA); 1751 AllToInit.push_back(Value); 1752 break; 1753 } 1754 } 1755 } 1756 continue; 1757 } 1758 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1759 AllToInit.push_back(Value); 1760 continue; 1761 } 1762 1763 if (AnyErrors) 1764 continue; 1765 1766 CXXBaseOrMemberInitializer *Member; 1767 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1768 *Field, Member)) { 1769 HadError = true; 1770 continue; 1771 } 1772 1773 // If the member doesn't need to be initialized, it will be null. 1774 if (Member) 1775 AllToInit.push_back(Member); 1776 } 1777 1778 NumInitializers = AllToInit.size(); 1779 if (NumInitializers > 0) { 1780 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1781 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1782 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1783 memcpy(baseOrMemberInitializers, AllToInit.data(), 1784 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1785 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1786 1787 // Constructors implicitly reference the base and member 1788 // destructors. 1789 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1790 Constructor->getParent()); 1791 } 1792 1793 return HadError; 1794} 1795 1796static void *GetKeyForTopLevelField(FieldDecl *Field) { 1797 // For anonymous unions, use the class declaration as the key. 1798 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1799 if (RT->getDecl()->isAnonymousStructOrUnion()) 1800 return static_cast<void *>(RT->getDecl()); 1801 } 1802 return static_cast<void *>(Field); 1803} 1804 1805static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1806 return Context.getCanonicalType(BaseType).getTypePtr(); 1807} 1808 1809static void *GetKeyForMember(ASTContext &Context, 1810 CXXBaseOrMemberInitializer *Member, 1811 bool MemberMaybeAnon = false) { 1812 if (!Member->isMemberInitializer()) 1813 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1814 1815 // For fields injected into the class via declaration of an anonymous union, 1816 // use its anonymous union class declaration as the unique key. 1817 FieldDecl *Field = Member->getMember(); 1818 1819 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1820 // data member of the class. Data member used in the initializer list is 1821 // in AnonUnionMember field. 1822 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1823 Field = Member->getAnonUnionMember(); 1824 1825 // If the field is a member of an anonymous struct or union, our key 1826 // is the anonymous record decl that's a direct child of the class. 1827 RecordDecl *RD = Field->getParent(); 1828 if (RD->isAnonymousStructOrUnion()) { 1829 while (true) { 1830 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1831 if (Parent->isAnonymousStructOrUnion()) 1832 RD = Parent; 1833 else 1834 break; 1835 } 1836 1837 return static_cast<void *>(RD); 1838 } 1839 1840 return static_cast<void *>(Field); 1841} 1842 1843static void 1844DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1845 const CXXConstructorDecl *Constructor, 1846 CXXBaseOrMemberInitializer **Inits, 1847 unsigned NumInits) { 1848 if (Constructor->getDeclContext()->isDependentContext()) 1849 return; 1850 1851 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1852 == Diagnostic::Ignored) 1853 return; 1854 1855 // Build the list of bases and members in the order that they'll 1856 // actually be initialized. The explicit initializers should be in 1857 // this same order but may be missing things. 1858 llvm::SmallVector<const void*, 32> IdealInitKeys; 1859 1860 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1861 1862 // 1. Virtual bases. 1863 for (CXXRecordDecl::base_class_const_iterator VBase = 1864 ClassDecl->vbases_begin(), 1865 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1866 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1867 1868 // 2. Non-virtual bases. 1869 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1870 E = ClassDecl->bases_end(); Base != E; ++Base) { 1871 if (Base->isVirtual()) 1872 continue; 1873 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1874 } 1875 1876 // 3. Direct fields. 1877 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1878 E = ClassDecl->field_end(); Field != E; ++Field) 1879 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1880 1881 unsigned NumIdealInits = IdealInitKeys.size(); 1882 unsigned IdealIndex = 0; 1883 1884 CXXBaseOrMemberInitializer *PrevInit = 0; 1885 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1886 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1887 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1888 1889 // Scan forward to try to find this initializer in the idealized 1890 // initializers list. 1891 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1892 if (InitKey == IdealInitKeys[IdealIndex]) 1893 break; 1894 1895 // If we didn't find this initializer, it must be because we 1896 // scanned past it on a previous iteration. That can only 1897 // happen if we're out of order; emit a warning. 1898 if (IdealIndex == NumIdealInits) { 1899 assert(PrevInit && "initializer not found in initializer list"); 1900 1901 Sema::SemaDiagnosticBuilder D = 1902 SemaRef.Diag(PrevInit->getSourceLocation(), 1903 diag::warn_initializer_out_of_order); 1904 1905 if (PrevInit->isMemberInitializer()) 1906 D << 0 << PrevInit->getMember()->getDeclName(); 1907 else 1908 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1909 1910 if (Init->isMemberInitializer()) 1911 D << 0 << Init->getMember()->getDeclName(); 1912 else 1913 D << 1 << Init->getBaseClassInfo()->getType(); 1914 1915 // Move back to the initializer's location in the ideal list. 1916 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1917 if (InitKey == IdealInitKeys[IdealIndex]) 1918 break; 1919 1920 assert(IdealIndex != NumIdealInits && 1921 "initializer not found in initializer list"); 1922 } 1923 1924 PrevInit = Init; 1925 } 1926} 1927 1928namespace { 1929bool CheckRedundantInit(Sema &S, 1930 CXXBaseOrMemberInitializer *Init, 1931 CXXBaseOrMemberInitializer *&PrevInit) { 1932 if (!PrevInit) { 1933 PrevInit = Init; 1934 return false; 1935 } 1936 1937 if (FieldDecl *Field = Init->getMember()) 1938 S.Diag(Init->getSourceLocation(), 1939 diag::err_multiple_mem_initialization) 1940 << Field->getDeclName() 1941 << Init->getSourceRange(); 1942 else { 1943 Type *BaseClass = Init->getBaseClass(); 1944 assert(BaseClass && "neither field nor base"); 1945 S.Diag(Init->getSourceLocation(), 1946 diag::err_multiple_base_initialization) 1947 << QualType(BaseClass, 0) 1948 << Init->getSourceRange(); 1949 } 1950 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1951 << 0 << PrevInit->getSourceRange(); 1952 1953 return true; 1954} 1955 1956typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1957typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1958 1959bool CheckRedundantUnionInit(Sema &S, 1960 CXXBaseOrMemberInitializer *Init, 1961 RedundantUnionMap &Unions) { 1962 FieldDecl *Field = Init->getMember(); 1963 RecordDecl *Parent = Field->getParent(); 1964 if (!Parent->isAnonymousStructOrUnion()) 1965 return false; 1966 1967 NamedDecl *Child = Field; 1968 do { 1969 if (Parent->isUnion()) { 1970 UnionEntry &En = Unions[Parent]; 1971 if (En.first && En.first != Child) { 1972 S.Diag(Init->getSourceLocation(), 1973 diag::err_multiple_mem_union_initialization) 1974 << Field->getDeclName() 1975 << Init->getSourceRange(); 1976 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1977 << 0 << En.second->getSourceRange(); 1978 return true; 1979 } else if (!En.first) { 1980 En.first = Child; 1981 En.second = Init; 1982 } 1983 } 1984 1985 Child = Parent; 1986 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1987 } while (Parent->isAnonymousStructOrUnion()); 1988 1989 return false; 1990} 1991} 1992 1993/// ActOnMemInitializers - Handle the member initializers for a constructor. 1994void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1995 SourceLocation ColonLoc, 1996 MemInitTy **meminits, unsigned NumMemInits, 1997 bool AnyErrors) { 1998 if (!ConstructorDecl) 1999 return; 2000 2001 AdjustDeclIfTemplate(ConstructorDecl); 2002 2003 CXXConstructorDecl *Constructor 2004 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2005 2006 if (!Constructor) { 2007 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2008 return; 2009 } 2010 2011 CXXBaseOrMemberInitializer **MemInits = 2012 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2013 2014 // Mapping for the duplicate initializers check. 2015 // For member initializers, this is keyed with a FieldDecl*. 2016 // For base initializers, this is keyed with a Type*. 2017 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2018 2019 // Mapping for the inconsistent anonymous-union initializers check. 2020 RedundantUnionMap MemberUnions; 2021 2022 bool HadError = false; 2023 for (unsigned i = 0; i < NumMemInits; i++) { 2024 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2025 2026 if (Init->isMemberInitializer()) { 2027 FieldDecl *Field = Init->getMember(); 2028 if (CheckRedundantInit(*this, Init, Members[Field]) || 2029 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2030 HadError = true; 2031 } else { 2032 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2033 if (CheckRedundantInit(*this, Init, Members[Key])) 2034 HadError = true; 2035 } 2036 } 2037 2038 if (HadError) 2039 return; 2040 2041 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2042 2043 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2044} 2045 2046void 2047Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2048 CXXRecordDecl *ClassDecl) { 2049 // Ignore dependent contexts. 2050 if (ClassDecl->isDependentContext()) 2051 return; 2052 2053 // FIXME: all the access-control diagnostics are positioned on the 2054 // field/base declaration. That's probably good; that said, the 2055 // user might reasonably want to know why the destructor is being 2056 // emitted, and we currently don't say. 2057 2058 // Non-static data members. 2059 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2060 E = ClassDecl->field_end(); I != E; ++I) { 2061 FieldDecl *Field = *I; 2062 2063 QualType FieldType = Context.getBaseElementType(Field->getType()); 2064 2065 const RecordType* RT = FieldType->getAs<RecordType>(); 2066 if (!RT) 2067 continue; 2068 2069 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2070 if (FieldClassDecl->hasTrivialDestructor()) 2071 continue; 2072 2073 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2074 CheckDestructorAccess(Field->getLocation(), Dtor, 2075 PDiag(diag::err_access_dtor_field) 2076 << Field->getDeclName() 2077 << FieldType); 2078 2079 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2080 } 2081 2082 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2083 2084 // Bases. 2085 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2086 E = ClassDecl->bases_end(); Base != E; ++Base) { 2087 // Bases are always records in a well-formed non-dependent class. 2088 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2089 2090 // Remember direct virtual bases. 2091 if (Base->isVirtual()) 2092 DirectVirtualBases.insert(RT); 2093 2094 // Ignore trivial destructors. 2095 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2096 if (BaseClassDecl->hasTrivialDestructor()) 2097 continue; 2098 2099 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2100 2101 // FIXME: caret should be on the start of the class name 2102 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2103 PDiag(diag::err_access_dtor_base) 2104 << Base->getType() 2105 << Base->getSourceRange()); 2106 2107 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2108 } 2109 2110 // Virtual bases. 2111 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2112 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2113 2114 // Bases are always records in a well-formed non-dependent class. 2115 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2116 2117 // Ignore direct virtual bases. 2118 if (DirectVirtualBases.count(RT)) 2119 continue; 2120 2121 // Ignore trivial destructors. 2122 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2123 if (BaseClassDecl->hasTrivialDestructor()) 2124 continue; 2125 2126 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2127 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2128 PDiag(diag::err_access_dtor_vbase) 2129 << VBase->getType()); 2130 2131 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2132 } 2133} 2134 2135void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2136 if (!CDtorDecl) 2137 return; 2138 2139 if (CXXConstructorDecl *Constructor 2140 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2141 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2142} 2143 2144bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2145 unsigned DiagID, AbstractDiagSelID SelID, 2146 const CXXRecordDecl *CurrentRD) { 2147 if (SelID == -1) 2148 return RequireNonAbstractType(Loc, T, 2149 PDiag(DiagID), CurrentRD); 2150 else 2151 return RequireNonAbstractType(Loc, T, 2152 PDiag(DiagID) << SelID, CurrentRD); 2153} 2154 2155bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2156 const PartialDiagnostic &PD, 2157 const CXXRecordDecl *CurrentRD) { 2158 if (!getLangOptions().CPlusPlus) 2159 return false; 2160 2161 if (const ArrayType *AT = Context.getAsArrayType(T)) 2162 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2163 CurrentRD); 2164 2165 if (const PointerType *PT = T->getAs<PointerType>()) { 2166 // Find the innermost pointer type. 2167 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2168 PT = T; 2169 2170 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2171 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2172 } 2173 2174 const RecordType *RT = T->getAs<RecordType>(); 2175 if (!RT) 2176 return false; 2177 2178 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2179 2180 if (CurrentRD && CurrentRD != RD) 2181 return false; 2182 2183 // FIXME: is this reasonable? It matches current behavior, but.... 2184 if (!RD->getDefinition()) 2185 return false; 2186 2187 if (!RD->isAbstract()) 2188 return false; 2189 2190 Diag(Loc, PD) << RD->getDeclName(); 2191 2192 // Check if we've already emitted the list of pure virtual functions for this 2193 // class. 2194 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2195 return true; 2196 2197 CXXFinalOverriderMap FinalOverriders; 2198 RD->getFinalOverriders(FinalOverriders); 2199 2200 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2201 MEnd = FinalOverriders.end(); 2202 M != MEnd; 2203 ++M) { 2204 for (OverridingMethods::iterator SO = M->second.begin(), 2205 SOEnd = M->second.end(); 2206 SO != SOEnd; ++SO) { 2207 // C++ [class.abstract]p4: 2208 // A class is abstract if it contains or inherits at least one 2209 // pure virtual function for which the final overrider is pure 2210 // virtual. 2211 2212 // 2213 if (SO->second.size() != 1) 2214 continue; 2215 2216 if (!SO->second.front().Method->isPure()) 2217 continue; 2218 2219 Diag(SO->second.front().Method->getLocation(), 2220 diag::note_pure_virtual_function) 2221 << SO->second.front().Method->getDeclName(); 2222 } 2223 } 2224 2225 if (!PureVirtualClassDiagSet) 2226 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2227 PureVirtualClassDiagSet->insert(RD); 2228 2229 return true; 2230} 2231 2232namespace { 2233 class AbstractClassUsageDiagnoser 2234 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2235 Sema &SemaRef; 2236 CXXRecordDecl *AbstractClass; 2237 2238 bool VisitDeclContext(const DeclContext *DC) { 2239 bool Invalid = false; 2240 2241 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2242 E = DC->decls_end(); I != E; ++I) 2243 Invalid |= Visit(*I); 2244 2245 return Invalid; 2246 } 2247 2248 public: 2249 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2250 : SemaRef(SemaRef), AbstractClass(ac) { 2251 Visit(SemaRef.Context.getTranslationUnitDecl()); 2252 } 2253 2254 bool VisitFunctionDecl(const FunctionDecl *FD) { 2255 if (FD->isThisDeclarationADefinition()) { 2256 // No need to do the check if we're in a definition, because it requires 2257 // that the return/param types are complete. 2258 // because that requires 2259 return VisitDeclContext(FD); 2260 } 2261 2262 // Check the return type. 2263 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2264 bool Invalid = 2265 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2266 diag::err_abstract_type_in_decl, 2267 Sema::AbstractReturnType, 2268 AbstractClass); 2269 2270 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2271 E = FD->param_end(); I != E; ++I) { 2272 const ParmVarDecl *VD = *I; 2273 Invalid |= 2274 SemaRef.RequireNonAbstractType(VD->getLocation(), 2275 VD->getOriginalType(), 2276 diag::err_abstract_type_in_decl, 2277 Sema::AbstractParamType, 2278 AbstractClass); 2279 } 2280 2281 return Invalid; 2282 } 2283 2284 bool VisitDecl(const Decl* D) { 2285 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2286 return VisitDeclContext(DC); 2287 2288 return false; 2289 } 2290 }; 2291} 2292 2293/// \brief Perform semantic checks on a class definition that has been 2294/// completing, introducing implicitly-declared members, checking for 2295/// abstract types, etc. 2296void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2297 if (!Record || Record->isInvalidDecl()) 2298 return; 2299 2300 if (!Record->isDependentType()) 2301 AddImplicitlyDeclaredMembersToClass(S, Record); 2302 2303 if (Record->isInvalidDecl()) 2304 return; 2305 2306 // Set access bits correctly on the directly-declared conversions. 2307 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2308 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2309 Convs->setAccess(I, (*I)->getAccess()); 2310 2311 // Determine whether we need to check for final overriders. We do 2312 // this either when there are virtual base classes (in which case we 2313 // may end up finding multiple final overriders for a given virtual 2314 // function) or any of the base classes is abstract (in which case 2315 // we might detect that this class is abstract). 2316 bool CheckFinalOverriders = false; 2317 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2318 !Record->isDependentType()) { 2319 if (Record->getNumVBases()) 2320 CheckFinalOverriders = true; 2321 else if (!Record->isAbstract()) { 2322 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2323 BEnd = Record->bases_end(); 2324 B != BEnd; ++B) { 2325 CXXRecordDecl *BaseDecl 2326 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2327 if (BaseDecl->isAbstract()) { 2328 CheckFinalOverriders = true; 2329 break; 2330 } 2331 } 2332 } 2333 } 2334 2335 if (CheckFinalOverriders) { 2336 CXXFinalOverriderMap FinalOverriders; 2337 Record->getFinalOverriders(FinalOverriders); 2338 2339 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2340 MEnd = FinalOverriders.end(); 2341 M != MEnd; ++M) { 2342 for (OverridingMethods::iterator SO = M->second.begin(), 2343 SOEnd = M->second.end(); 2344 SO != SOEnd; ++SO) { 2345 assert(SO->second.size() > 0 && 2346 "All virtual functions have overridding virtual functions"); 2347 if (SO->second.size() == 1) { 2348 // C++ [class.abstract]p4: 2349 // A class is abstract if it contains or inherits at least one 2350 // pure virtual function for which the final overrider is pure 2351 // virtual. 2352 if (SO->second.front().Method->isPure()) 2353 Record->setAbstract(true); 2354 continue; 2355 } 2356 2357 // C++ [class.virtual]p2: 2358 // In a derived class, if a virtual member function of a base 2359 // class subobject has more than one final overrider the 2360 // program is ill-formed. 2361 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2362 << (NamedDecl *)M->first << Record; 2363 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2364 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2365 OMEnd = SO->second.end(); 2366 OM != OMEnd; ++OM) 2367 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2368 << (NamedDecl *)M->first << OM->Method->getParent(); 2369 2370 Record->setInvalidDecl(); 2371 } 2372 } 2373 } 2374 2375 if (Record->isAbstract() && !Record->isInvalidDecl()) 2376 (void)AbstractClassUsageDiagnoser(*this, Record); 2377 2378 // If this is not an aggregate type and has no user-declared constructor, 2379 // complain about any non-static data members of reference or const scalar 2380 // type, since they will never get initializers. 2381 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2382 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2383 bool Complained = false; 2384 for (RecordDecl::field_iterator F = Record->field_begin(), 2385 FEnd = Record->field_end(); 2386 F != FEnd; ++F) { 2387 if (F->getType()->isReferenceType() || 2388 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2389 if (!Complained) { 2390 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2391 << Record->getTagKind() << Record; 2392 Complained = true; 2393 } 2394 2395 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2396 << F->getType()->isReferenceType() 2397 << F->getDeclName(); 2398 } 2399 } 2400 } 2401} 2402 2403void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2404 DeclPtrTy TagDecl, 2405 SourceLocation LBrac, 2406 SourceLocation RBrac, 2407 AttributeList *AttrList) { 2408 if (!TagDecl) 2409 return; 2410 2411 AdjustDeclIfTemplate(TagDecl); 2412 2413 ActOnFields(S, RLoc, TagDecl, 2414 (DeclPtrTy*)FieldCollector->getCurFields(), 2415 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2416 2417 CheckCompletedCXXClass(S, 2418 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2419} 2420 2421/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2422/// special functions, such as the default constructor, copy 2423/// constructor, or destructor, to the given C++ class (C++ 2424/// [special]p1). This routine can only be executed just before the 2425/// definition of the class is complete. 2426/// 2427/// The scope, if provided, is the class scope. 2428void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2429 CXXRecordDecl *ClassDecl) { 2430 CanQualType ClassType 2431 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2432 2433 // FIXME: Implicit declarations have exception specifications, which are 2434 // the union of the specifications of the implicitly called functions. 2435 2436 if (!ClassDecl->hasUserDeclaredConstructor()) { 2437 // C++ [class.ctor]p5: 2438 // A default constructor for a class X is a constructor of class X 2439 // that can be called without an argument. If there is no 2440 // user-declared constructor for class X, a default constructor is 2441 // implicitly declared. An implicitly-declared default constructor 2442 // is an inline public member of its class. 2443 DeclarationName Name 2444 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2445 CXXConstructorDecl *DefaultCon = 2446 CXXConstructorDecl::Create(Context, ClassDecl, 2447 ClassDecl->getLocation(), Name, 2448 Context.getFunctionType(Context.VoidTy, 2449 0, 0, false, 0, 2450 /*FIXME*/false, false, 2451 0, 0, 2452 FunctionType::ExtInfo()), 2453 /*TInfo=*/0, 2454 /*isExplicit=*/false, 2455 /*isInline=*/true, 2456 /*isImplicitlyDeclared=*/true); 2457 DefaultCon->setAccess(AS_public); 2458 DefaultCon->setImplicit(); 2459 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2460 if (S) 2461 PushOnScopeChains(DefaultCon, S, true); 2462 else 2463 ClassDecl->addDecl(DefaultCon); 2464 } 2465 2466 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2467 // C++ [class.copy]p4: 2468 // If the class definition does not explicitly declare a copy 2469 // constructor, one is declared implicitly. 2470 2471 // C++ [class.copy]p5: 2472 // The implicitly-declared copy constructor for a class X will 2473 // have the form 2474 // 2475 // X::X(const X&) 2476 // 2477 // if 2478 bool HasConstCopyConstructor = true; 2479 2480 // -- each direct or virtual base class B of X has a copy 2481 // constructor whose first parameter is of type const B& or 2482 // const volatile B&, and 2483 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2484 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2485 const CXXRecordDecl *BaseClassDecl 2486 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2487 HasConstCopyConstructor 2488 = BaseClassDecl->hasConstCopyConstructor(Context); 2489 } 2490 2491 // -- for all the nonstatic data members of X that are of a 2492 // class type M (or array thereof), each such class type 2493 // has a copy constructor whose first parameter is of type 2494 // const M& or const volatile M&. 2495 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2496 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2497 ++Field) { 2498 QualType FieldType = (*Field)->getType(); 2499 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2500 FieldType = Array->getElementType(); 2501 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2502 const CXXRecordDecl *FieldClassDecl 2503 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2504 HasConstCopyConstructor 2505 = FieldClassDecl->hasConstCopyConstructor(Context); 2506 } 2507 } 2508 2509 // Otherwise, the implicitly declared copy constructor will have 2510 // the form 2511 // 2512 // X::X(X&) 2513 QualType ArgType = ClassType; 2514 if (HasConstCopyConstructor) 2515 ArgType = ArgType.withConst(); 2516 ArgType = Context.getLValueReferenceType(ArgType); 2517 2518 // An implicitly-declared copy constructor is an inline public 2519 // member of its class. 2520 DeclarationName Name 2521 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2522 CXXConstructorDecl *CopyConstructor 2523 = CXXConstructorDecl::Create(Context, ClassDecl, 2524 ClassDecl->getLocation(), Name, 2525 Context.getFunctionType(Context.VoidTy, 2526 &ArgType, 1, 2527 false, 0, 2528 /*FIXME:*/false, 2529 false, 0, 0, 2530 FunctionType::ExtInfo()), 2531 /*TInfo=*/0, 2532 /*isExplicit=*/false, 2533 /*isInline=*/true, 2534 /*isImplicitlyDeclared=*/true); 2535 CopyConstructor->setAccess(AS_public); 2536 CopyConstructor->setImplicit(); 2537 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2538 2539 // Add the parameter to the constructor. 2540 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2541 ClassDecl->getLocation(), 2542 /*IdentifierInfo=*/0, 2543 ArgType, /*TInfo=*/0, 2544 VarDecl::None, 2545 VarDecl::None, 0); 2546 CopyConstructor->setParams(&FromParam, 1); 2547 if (S) 2548 PushOnScopeChains(CopyConstructor, S, true); 2549 else 2550 ClassDecl->addDecl(CopyConstructor); 2551 } 2552 2553 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2554 // Note: The following rules are largely analoguous to the copy 2555 // constructor rules. Note that virtual bases are not taken into account 2556 // for determining the argument type of the operator. Note also that 2557 // operators taking an object instead of a reference are allowed. 2558 // 2559 // C++ [class.copy]p10: 2560 // If the class definition does not explicitly declare a copy 2561 // assignment operator, one is declared implicitly. 2562 // The implicitly-defined copy assignment operator for a class X 2563 // will have the form 2564 // 2565 // X& X::operator=(const X&) 2566 // 2567 // if 2568 bool HasConstCopyAssignment = true; 2569 2570 // -- each direct base class B of X has a copy assignment operator 2571 // whose parameter is of type const B&, const volatile B& or B, 2572 // and 2573 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2574 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2575 assert(!Base->getType()->isDependentType() && 2576 "Cannot generate implicit members for class with dependent bases."); 2577 const CXXRecordDecl *BaseClassDecl 2578 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2579 const CXXMethodDecl *MD = 0; 2580 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2581 MD); 2582 } 2583 2584 // -- for all the nonstatic data members of X that are of a class 2585 // type M (or array thereof), each such class type has a copy 2586 // assignment operator whose parameter is of type const M&, 2587 // const volatile M& or M. 2588 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2589 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2590 ++Field) { 2591 QualType FieldType = (*Field)->getType(); 2592 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2593 FieldType = Array->getElementType(); 2594 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2595 const CXXRecordDecl *FieldClassDecl 2596 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2597 const CXXMethodDecl *MD = 0; 2598 HasConstCopyAssignment 2599 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2600 } 2601 } 2602 2603 // Otherwise, the implicitly declared copy assignment operator will 2604 // have the form 2605 // 2606 // X& X::operator=(X&) 2607 QualType ArgType = ClassType; 2608 QualType RetType = Context.getLValueReferenceType(ArgType); 2609 if (HasConstCopyAssignment) 2610 ArgType = ArgType.withConst(); 2611 ArgType = Context.getLValueReferenceType(ArgType); 2612 2613 // An implicitly-declared copy assignment operator is an inline public 2614 // member of its class. 2615 DeclarationName Name = 2616 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2617 CXXMethodDecl *CopyAssignment = 2618 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2619 Context.getFunctionType(RetType, &ArgType, 1, 2620 false, 0, 2621 /*FIXME:*/false, 2622 false, 0, 0, 2623 FunctionType::ExtInfo()), 2624 /*TInfo=*/0, /*isStatic=*/false, 2625 /*StorageClassAsWritten=*/FunctionDecl::None, 2626 /*isInline=*/true); 2627 CopyAssignment->setAccess(AS_public); 2628 CopyAssignment->setImplicit(); 2629 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2630 CopyAssignment->setCopyAssignment(true); 2631 2632 // Add the parameter to the operator. 2633 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2634 ClassDecl->getLocation(), 2635 /*IdentifierInfo=*/0, 2636 ArgType, /*TInfo=*/0, 2637 VarDecl::None, 2638 VarDecl::None, 0); 2639 CopyAssignment->setParams(&FromParam, 1); 2640 2641 // Don't call addedAssignmentOperator. There is no way to distinguish an 2642 // implicit from an explicit assignment operator. 2643 if (S) 2644 PushOnScopeChains(CopyAssignment, S, true); 2645 else 2646 ClassDecl->addDecl(CopyAssignment); 2647 AddOverriddenMethods(ClassDecl, CopyAssignment); 2648 } 2649 2650 if (!ClassDecl->hasUserDeclaredDestructor()) { 2651 // C++ [class.dtor]p2: 2652 // If a class has no user-declared destructor, a destructor is 2653 // declared implicitly. An implicitly-declared destructor is an 2654 // inline public member of its class. 2655 QualType Ty = Context.getFunctionType(Context.VoidTy, 2656 0, 0, false, 0, 2657 /*FIXME:*/false, 2658 false, 0, 0, FunctionType::ExtInfo()); 2659 2660 DeclarationName Name 2661 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2662 CXXDestructorDecl *Destructor 2663 = CXXDestructorDecl::Create(Context, ClassDecl, 2664 ClassDecl->getLocation(), Name, Ty, 2665 /*isInline=*/true, 2666 /*isImplicitlyDeclared=*/true); 2667 Destructor->setAccess(AS_public); 2668 Destructor->setImplicit(); 2669 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2670 if (S) 2671 PushOnScopeChains(Destructor, S, true); 2672 else 2673 ClassDecl->addDecl(Destructor); 2674 2675 // This could be uniqued if it ever proves significant. 2676 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2677 2678 AddOverriddenMethods(ClassDecl, Destructor); 2679 } 2680} 2681 2682void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2683 Decl *D = TemplateD.getAs<Decl>(); 2684 if (!D) 2685 return; 2686 2687 TemplateParameterList *Params = 0; 2688 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2689 Params = Template->getTemplateParameters(); 2690 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2691 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2692 Params = PartialSpec->getTemplateParameters(); 2693 else 2694 return; 2695 2696 for (TemplateParameterList::iterator Param = Params->begin(), 2697 ParamEnd = Params->end(); 2698 Param != ParamEnd; ++Param) { 2699 NamedDecl *Named = cast<NamedDecl>(*Param); 2700 if (Named->getDeclName()) { 2701 S->AddDecl(DeclPtrTy::make(Named)); 2702 IdResolver.AddDecl(Named); 2703 } 2704 } 2705} 2706 2707void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2708 if (!RecordD) return; 2709 AdjustDeclIfTemplate(RecordD); 2710 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2711 PushDeclContext(S, Record); 2712} 2713 2714void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2715 if (!RecordD) return; 2716 PopDeclContext(); 2717} 2718 2719/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2720/// parsing a top-level (non-nested) C++ class, and we are now 2721/// parsing those parts of the given Method declaration that could 2722/// not be parsed earlier (C++ [class.mem]p2), such as default 2723/// arguments. This action should enter the scope of the given 2724/// Method declaration as if we had just parsed the qualified method 2725/// name. However, it should not bring the parameters into scope; 2726/// that will be performed by ActOnDelayedCXXMethodParameter. 2727void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2728} 2729 2730/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2731/// C++ method declaration. We're (re-)introducing the given 2732/// function parameter into scope for use in parsing later parts of 2733/// the method declaration. For example, we could see an 2734/// ActOnParamDefaultArgument event for this parameter. 2735void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2736 if (!ParamD) 2737 return; 2738 2739 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2740 2741 // If this parameter has an unparsed default argument, clear it out 2742 // to make way for the parsed default argument. 2743 if (Param->hasUnparsedDefaultArg()) 2744 Param->setDefaultArg(0); 2745 2746 S->AddDecl(DeclPtrTy::make(Param)); 2747 if (Param->getDeclName()) 2748 IdResolver.AddDecl(Param); 2749} 2750 2751/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2752/// processing the delayed method declaration for Method. The method 2753/// declaration is now considered finished. There may be a separate 2754/// ActOnStartOfFunctionDef action later (not necessarily 2755/// immediately!) for this method, if it was also defined inside the 2756/// class body. 2757void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2758 if (!MethodD) 2759 return; 2760 2761 AdjustDeclIfTemplate(MethodD); 2762 2763 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2764 2765 // Now that we have our default arguments, check the constructor 2766 // again. It could produce additional diagnostics or affect whether 2767 // the class has implicitly-declared destructors, among other 2768 // things. 2769 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2770 CheckConstructor(Constructor); 2771 2772 // Check the default arguments, which we may have added. 2773 if (!Method->isInvalidDecl()) 2774 CheckCXXDefaultArguments(Method); 2775} 2776 2777/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2778/// the well-formedness of the constructor declarator @p D with type @p 2779/// R. If there are any errors in the declarator, this routine will 2780/// emit diagnostics and set the invalid bit to true. In any case, the type 2781/// will be updated to reflect a well-formed type for the constructor and 2782/// returned. 2783QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2784 FunctionDecl::StorageClass &SC) { 2785 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2786 2787 // C++ [class.ctor]p3: 2788 // A constructor shall not be virtual (10.3) or static (9.4). A 2789 // constructor can be invoked for a const, volatile or const 2790 // volatile object. A constructor shall not be declared const, 2791 // volatile, or const volatile (9.3.2). 2792 if (isVirtual) { 2793 if (!D.isInvalidType()) 2794 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2795 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2796 << SourceRange(D.getIdentifierLoc()); 2797 D.setInvalidType(); 2798 } 2799 if (SC == FunctionDecl::Static) { 2800 if (!D.isInvalidType()) 2801 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2802 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2803 << SourceRange(D.getIdentifierLoc()); 2804 D.setInvalidType(); 2805 SC = FunctionDecl::None; 2806 } 2807 2808 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2809 if (FTI.TypeQuals != 0) { 2810 if (FTI.TypeQuals & Qualifiers::Const) 2811 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2812 << "const" << SourceRange(D.getIdentifierLoc()); 2813 if (FTI.TypeQuals & Qualifiers::Volatile) 2814 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2815 << "volatile" << SourceRange(D.getIdentifierLoc()); 2816 if (FTI.TypeQuals & Qualifiers::Restrict) 2817 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2818 << "restrict" << SourceRange(D.getIdentifierLoc()); 2819 } 2820 2821 // Rebuild the function type "R" without any type qualifiers (in 2822 // case any of the errors above fired) and with "void" as the 2823 // return type, since constructors don't have return types. We 2824 // *always* have to do this, because GetTypeForDeclarator will 2825 // put in a result type of "int" when none was specified. 2826 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2827 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2828 Proto->getNumArgs(), 2829 Proto->isVariadic(), 0, 2830 Proto->hasExceptionSpec(), 2831 Proto->hasAnyExceptionSpec(), 2832 Proto->getNumExceptions(), 2833 Proto->exception_begin(), 2834 Proto->getExtInfo()); 2835} 2836 2837/// CheckConstructor - Checks a fully-formed constructor for 2838/// well-formedness, issuing any diagnostics required. Returns true if 2839/// the constructor declarator is invalid. 2840void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2841 CXXRecordDecl *ClassDecl 2842 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2843 if (!ClassDecl) 2844 return Constructor->setInvalidDecl(); 2845 2846 // C++ [class.copy]p3: 2847 // A declaration of a constructor for a class X is ill-formed if 2848 // its first parameter is of type (optionally cv-qualified) X and 2849 // either there are no other parameters or else all other 2850 // parameters have default arguments. 2851 if (!Constructor->isInvalidDecl() && 2852 ((Constructor->getNumParams() == 1) || 2853 (Constructor->getNumParams() > 1 && 2854 Constructor->getParamDecl(1)->hasDefaultArg())) && 2855 Constructor->getTemplateSpecializationKind() 2856 != TSK_ImplicitInstantiation) { 2857 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2858 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2859 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2860 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2861 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2862 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2863 2864 // FIXME: Rather that making the constructor invalid, we should endeavor 2865 // to fix the type. 2866 Constructor->setInvalidDecl(); 2867 } 2868 } 2869 2870 // Notify the class that we've added a constructor. In principle we 2871 // don't need to do this for out-of-line declarations; in practice 2872 // we only instantiate the most recent declaration of a method, so 2873 // we have to call this for everything but friends. 2874 if (!Constructor->getFriendObjectKind()) 2875 ClassDecl->addedConstructor(Context, Constructor); 2876} 2877 2878/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2879/// issuing any diagnostics required. Returns true on error. 2880bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2881 CXXRecordDecl *RD = Destructor->getParent(); 2882 2883 if (Destructor->isVirtual()) { 2884 SourceLocation Loc; 2885 2886 if (!Destructor->isImplicit()) 2887 Loc = Destructor->getLocation(); 2888 else 2889 Loc = RD->getLocation(); 2890 2891 // If we have a virtual destructor, look up the deallocation function 2892 FunctionDecl *OperatorDelete = 0; 2893 DeclarationName Name = 2894 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2895 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2896 return true; 2897 2898 Destructor->setOperatorDelete(OperatorDelete); 2899 } 2900 2901 return false; 2902} 2903 2904static inline bool 2905FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2906 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2907 FTI.ArgInfo[0].Param && 2908 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2909} 2910 2911/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2912/// the well-formednes of the destructor declarator @p D with type @p 2913/// R. If there are any errors in the declarator, this routine will 2914/// emit diagnostics and set the declarator to invalid. Even if this happens, 2915/// will be updated to reflect a well-formed type for the destructor and 2916/// returned. 2917QualType Sema::CheckDestructorDeclarator(Declarator &D, 2918 FunctionDecl::StorageClass& SC) { 2919 // C++ [class.dtor]p1: 2920 // [...] A typedef-name that names a class is a class-name 2921 // (7.1.3); however, a typedef-name that names a class shall not 2922 // be used as the identifier in the declarator for a destructor 2923 // declaration. 2924 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2925 if (isa<TypedefType>(DeclaratorType)) { 2926 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2927 << DeclaratorType; 2928 D.setInvalidType(); 2929 } 2930 2931 // C++ [class.dtor]p2: 2932 // A destructor is used to destroy objects of its class type. A 2933 // destructor takes no parameters, and no return type can be 2934 // specified for it (not even void). The address of a destructor 2935 // shall not be taken. A destructor shall not be static. A 2936 // destructor can be invoked for a const, volatile or const 2937 // volatile object. A destructor shall not be declared const, 2938 // volatile or const volatile (9.3.2). 2939 if (SC == FunctionDecl::Static) { 2940 if (!D.isInvalidType()) 2941 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2942 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2943 << SourceRange(D.getIdentifierLoc()); 2944 SC = FunctionDecl::None; 2945 D.setInvalidType(); 2946 } 2947 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2948 // Destructors don't have return types, but the parser will 2949 // happily parse something like: 2950 // 2951 // class X { 2952 // float ~X(); 2953 // }; 2954 // 2955 // The return type will be eliminated later. 2956 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2957 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2958 << SourceRange(D.getIdentifierLoc()); 2959 } 2960 2961 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2962 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2963 if (FTI.TypeQuals & Qualifiers::Const) 2964 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2965 << "const" << SourceRange(D.getIdentifierLoc()); 2966 if (FTI.TypeQuals & Qualifiers::Volatile) 2967 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2968 << "volatile" << SourceRange(D.getIdentifierLoc()); 2969 if (FTI.TypeQuals & Qualifiers::Restrict) 2970 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2971 << "restrict" << SourceRange(D.getIdentifierLoc()); 2972 D.setInvalidType(); 2973 } 2974 2975 // Make sure we don't have any parameters. 2976 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2977 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2978 2979 // Delete the parameters. 2980 FTI.freeArgs(); 2981 D.setInvalidType(); 2982 } 2983 2984 // Make sure the destructor isn't variadic. 2985 if (FTI.isVariadic) { 2986 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2987 D.setInvalidType(); 2988 } 2989 2990 // Rebuild the function type "R" without any type qualifiers or 2991 // parameters (in case any of the errors above fired) and with 2992 // "void" as the return type, since destructors don't have return 2993 // types. We *always* have to do this, because GetTypeForDeclarator 2994 // will put in a result type of "int" when none was specified. 2995 // FIXME: Exceptions! 2996 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2997 false, false, 0, 0, FunctionType::ExtInfo()); 2998} 2999 3000/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3001/// well-formednes of the conversion function declarator @p D with 3002/// type @p R. If there are any errors in the declarator, this routine 3003/// will emit diagnostics and return true. Otherwise, it will return 3004/// false. Either way, the type @p R will be updated to reflect a 3005/// well-formed type for the conversion operator. 3006void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3007 FunctionDecl::StorageClass& SC) { 3008 // C++ [class.conv.fct]p1: 3009 // Neither parameter types nor return type can be specified. The 3010 // type of a conversion function (8.3.5) is "function taking no 3011 // parameter returning conversion-type-id." 3012 if (SC == FunctionDecl::Static) { 3013 if (!D.isInvalidType()) 3014 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3015 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3016 << SourceRange(D.getIdentifierLoc()); 3017 D.setInvalidType(); 3018 SC = FunctionDecl::None; 3019 } 3020 3021 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3022 3023 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3024 // Conversion functions don't have return types, but the parser will 3025 // happily parse something like: 3026 // 3027 // class X { 3028 // float operator bool(); 3029 // }; 3030 // 3031 // The return type will be changed later anyway. 3032 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3033 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3034 << SourceRange(D.getIdentifierLoc()); 3035 D.setInvalidType(); 3036 } 3037 3038 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3039 3040 // Make sure we don't have any parameters. 3041 if (Proto->getNumArgs() > 0) { 3042 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3043 3044 // Delete the parameters. 3045 D.getTypeObject(0).Fun.freeArgs(); 3046 D.setInvalidType(); 3047 } else if (Proto->isVariadic()) { 3048 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3049 D.setInvalidType(); 3050 } 3051 3052 // Diagnose "&operator bool()" and other such nonsense. This 3053 // is actually a gcc extension which we don't support. 3054 if (Proto->getResultType() != ConvType) { 3055 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3056 << Proto->getResultType(); 3057 D.setInvalidType(); 3058 ConvType = Proto->getResultType(); 3059 } 3060 3061 // C++ [class.conv.fct]p4: 3062 // The conversion-type-id shall not represent a function type nor 3063 // an array type. 3064 if (ConvType->isArrayType()) { 3065 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3066 ConvType = Context.getPointerType(ConvType); 3067 D.setInvalidType(); 3068 } else if (ConvType->isFunctionType()) { 3069 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3070 ConvType = Context.getPointerType(ConvType); 3071 D.setInvalidType(); 3072 } 3073 3074 // Rebuild the function type "R" without any parameters (in case any 3075 // of the errors above fired) and with the conversion type as the 3076 // return type. 3077 if (D.isInvalidType()) { 3078 R = Context.getFunctionType(ConvType, 0, 0, false, 3079 Proto->getTypeQuals(), 3080 Proto->hasExceptionSpec(), 3081 Proto->hasAnyExceptionSpec(), 3082 Proto->getNumExceptions(), 3083 Proto->exception_begin(), 3084 Proto->getExtInfo()); 3085 } 3086 3087 // C++0x explicit conversion operators. 3088 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3089 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3090 diag::warn_explicit_conversion_functions) 3091 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3092} 3093 3094/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3095/// the declaration of the given C++ conversion function. This routine 3096/// is responsible for recording the conversion function in the C++ 3097/// class, if possible. 3098Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3099 assert(Conversion && "Expected to receive a conversion function declaration"); 3100 3101 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3102 3103 // Make sure we aren't redeclaring the conversion function. 3104 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3105 3106 // C++ [class.conv.fct]p1: 3107 // [...] A conversion function is never used to convert a 3108 // (possibly cv-qualified) object to the (possibly cv-qualified) 3109 // same object type (or a reference to it), to a (possibly 3110 // cv-qualified) base class of that type (or a reference to it), 3111 // or to (possibly cv-qualified) void. 3112 // FIXME: Suppress this warning if the conversion function ends up being a 3113 // virtual function that overrides a virtual function in a base class. 3114 QualType ClassType 3115 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3116 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3117 ConvType = ConvTypeRef->getPointeeType(); 3118 if (ConvType->isRecordType()) { 3119 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3120 if (ConvType == ClassType) 3121 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3122 << ClassType; 3123 else if (IsDerivedFrom(ClassType, ConvType)) 3124 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3125 << ClassType << ConvType; 3126 } else if (ConvType->isVoidType()) { 3127 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3128 << ClassType << ConvType; 3129 } 3130 3131 if (Conversion->getPrimaryTemplate()) { 3132 // ignore specializations 3133 } else if (Conversion->getPreviousDeclaration()) { 3134 if (FunctionTemplateDecl *ConversionTemplate 3135 = Conversion->getDescribedFunctionTemplate()) { 3136 if (ClassDecl->replaceConversion( 3137 ConversionTemplate->getPreviousDeclaration(), 3138 ConversionTemplate)) 3139 return DeclPtrTy::make(ConversionTemplate); 3140 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3141 Conversion)) 3142 return DeclPtrTy::make(Conversion); 3143 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3144 } else if (FunctionTemplateDecl *ConversionTemplate 3145 = Conversion->getDescribedFunctionTemplate()) 3146 ClassDecl->addConversionFunction(ConversionTemplate); 3147 else 3148 ClassDecl->addConversionFunction(Conversion); 3149 3150 return DeclPtrTy::make(Conversion); 3151} 3152 3153//===----------------------------------------------------------------------===// 3154// Namespace Handling 3155//===----------------------------------------------------------------------===// 3156 3157/// ActOnStartNamespaceDef - This is called at the start of a namespace 3158/// definition. 3159Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3160 SourceLocation IdentLoc, 3161 IdentifierInfo *II, 3162 SourceLocation LBrace, 3163 AttributeList *AttrList) { 3164 NamespaceDecl *Namespc = 3165 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3166 Namespc->setLBracLoc(LBrace); 3167 3168 Scope *DeclRegionScope = NamespcScope->getParent(); 3169 3170 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3171 3172 if (II) { 3173 // C++ [namespace.def]p2: 3174 // The identifier in an original-namespace-definition shall not have been 3175 // previously defined in the declarative region in which the 3176 // original-namespace-definition appears. The identifier in an 3177 // original-namespace-definition is the name of the namespace. Subsequently 3178 // in that declarative region, it is treated as an original-namespace-name. 3179 3180 NamedDecl *PrevDecl 3181 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3182 ForRedeclaration); 3183 3184 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3185 // This is an extended namespace definition. 3186 // Attach this namespace decl to the chain of extended namespace 3187 // definitions. 3188 OrigNS->setNextNamespace(Namespc); 3189 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3190 3191 // Remove the previous declaration from the scope. 3192 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3193 IdResolver.RemoveDecl(OrigNS); 3194 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3195 } 3196 } else if (PrevDecl) { 3197 // This is an invalid name redefinition. 3198 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3199 << Namespc->getDeclName(); 3200 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3201 Namespc->setInvalidDecl(); 3202 // Continue on to push Namespc as current DeclContext and return it. 3203 } else if (II->isStr("std") && 3204 CurContext->getLookupContext()->isTranslationUnit()) { 3205 // This is the first "real" definition of the namespace "std", so update 3206 // our cache of the "std" namespace to point at this definition. 3207 if (StdNamespace) { 3208 // We had already defined a dummy namespace "std". Link this new 3209 // namespace definition to the dummy namespace "std". 3210 StdNamespace->setNextNamespace(Namespc); 3211 StdNamespace->setLocation(IdentLoc); 3212 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3213 } 3214 3215 // Make our StdNamespace cache point at the first real definition of the 3216 // "std" namespace. 3217 StdNamespace = Namespc; 3218 } 3219 3220 PushOnScopeChains(Namespc, DeclRegionScope); 3221 } else { 3222 // Anonymous namespaces. 3223 assert(Namespc->isAnonymousNamespace()); 3224 3225 // Link the anonymous namespace into its parent. 3226 NamespaceDecl *PrevDecl; 3227 DeclContext *Parent = CurContext->getLookupContext(); 3228 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3229 PrevDecl = TU->getAnonymousNamespace(); 3230 TU->setAnonymousNamespace(Namespc); 3231 } else { 3232 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3233 PrevDecl = ND->getAnonymousNamespace(); 3234 ND->setAnonymousNamespace(Namespc); 3235 } 3236 3237 // Link the anonymous namespace with its previous declaration. 3238 if (PrevDecl) { 3239 assert(PrevDecl->isAnonymousNamespace()); 3240 assert(!PrevDecl->getNextNamespace()); 3241 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3242 PrevDecl->setNextNamespace(Namespc); 3243 } 3244 3245 CurContext->addDecl(Namespc); 3246 3247 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3248 // behaves as if it were replaced by 3249 // namespace unique { /* empty body */ } 3250 // using namespace unique; 3251 // namespace unique { namespace-body } 3252 // where all occurrences of 'unique' in a translation unit are 3253 // replaced by the same identifier and this identifier differs 3254 // from all other identifiers in the entire program. 3255 3256 // We just create the namespace with an empty name and then add an 3257 // implicit using declaration, just like the standard suggests. 3258 // 3259 // CodeGen enforces the "universally unique" aspect by giving all 3260 // declarations semantically contained within an anonymous 3261 // namespace internal linkage. 3262 3263 if (!PrevDecl) { 3264 UsingDirectiveDecl* UD 3265 = UsingDirectiveDecl::Create(Context, CurContext, 3266 /* 'using' */ LBrace, 3267 /* 'namespace' */ SourceLocation(), 3268 /* qualifier */ SourceRange(), 3269 /* NNS */ NULL, 3270 /* identifier */ SourceLocation(), 3271 Namespc, 3272 /* Ancestor */ CurContext); 3273 UD->setImplicit(); 3274 CurContext->addDecl(UD); 3275 } 3276 } 3277 3278 // Although we could have an invalid decl (i.e. the namespace name is a 3279 // redefinition), push it as current DeclContext and try to continue parsing. 3280 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3281 // for the namespace has the declarations that showed up in that particular 3282 // namespace definition. 3283 PushDeclContext(NamespcScope, Namespc); 3284 return DeclPtrTy::make(Namespc); 3285} 3286 3287/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3288/// is a namespace alias, returns the namespace it points to. 3289static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3290 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3291 return AD->getNamespace(); 3292 return dyn_cast_or_null<NamespaceDecl>(D); 3293} 3294 3295/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3296/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3297void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3298 Decl *Dcl = D.getAs<Decl>(); 3299 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3300 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3301 Namespc->setRBracLoc(RBrace); 3302 PopDeclContext(); 3303} 3304 3305Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3306 SourceLocation UsingLoc, 3307 SourceLocation NamespcLoc, 3308 CXXScopeSpec &SS, 3309 SourceLocation IdentLoc, 3310 IdentifierInfo *NamespcName, 3311 AttributeList *AttrList) { 3312 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3313 assert(NamespcName && "Invalid NamespcName."); 3314 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3315 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3316 3317 UsingDirectiveDecl *UDir = 0; 3318 3319 // Lookup namespace name. 3320 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3321 LookupParsedName(R, S, &SS); 3322 if (R.isAmbiguous()) 3323 return DeclPtrTy(); 3324 3325 if (!R.empty()) { 3326 NamedDecl *Named = R.getFoundDecl(); 3327 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3328 && "expected namespace decl"); 3329 // C++ [namespace.udir]p1: 3330 // A using-directive specifies that the names in the nominated 3331 // namespace can be used in the scope in which the 3332 // using-directive appears after the using-directive. During 3333 // unqualified name lookup (3.4.1), the names appear as if they 3334 // were declared in the nearest enclosing namespace which 3335 // contains both the using-directive and the nominated 3336 // namespace. [Note: in this context, "contains" means "contains 3337 // directly or indirectly". ] 3338 3339 // Find enclosing context containing both using-directive and 3340 // nominated namespace. 3341 NamespaceDecl *NS = getNamespaceDecl(Named); 3342 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3343 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3344 CommonAncestor = CommonAncestor->getParent(); 3345 3346 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3347 SS.getRange(), 3348 (NestedNameSpecifier *)SS.getScopeRep(), 3349 IdentLoc, Named, CommonAncestor); 3350 PushUsingDirective(S, UDir); 3351 } else { 3352 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3353 } 3354 3355 // FIXME: We ignore attributes for now. 3356 delete AttrList; 3357 return DeclPtrTy::make(UDir); 3358} 3359 3360void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3361 // If scope has associated entity, then using directive is at namespace 3362 // or translation unit scope. We add UsingDirectiveDecls, into 3363 // it's lookup structure. 3364 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3365 Ctx->addDecl(UDir); 3366 else 3367 // Otherwise it is block-sope. using-directives will affect lookup 3368 // only to the end of scope. 3369 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3370} 3371 3372 3373Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3374 AccessSpecifier AS, 3375 bool HasUsingKeyword, 3376 SourceLocation UsingLoc, 3377 CXXScopeSpec &SS, 3378 UnqualifiedId &Name, 3379 AttributeList *AttrList, 3380 bool IsTypeName, 3381 SourceLocation TypenameLoc) { 3382 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3383 3384 switch (Name.getKind()) { 3385 case UnqualifiedId::IK_Identifier: 3386 case UnqualifiedId::IK_OperatorFunctionId: 3387 case UnqualifiedId::IK_LiteralOperatorId: 3388 case UnqualifiedId::IK_ConversionFunctionId: 3389 break; 3390 3391 case UnqualifiedId::IK_ConstructorName: 3392 case UnqualifiedId::IK_ConstructorTemplateId: 3393 // C++0x inherited constructors. 3394 if (getLangOptions().CPlusPlus0x) break; 3395 3396 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3397 << SS.getRange(); 3398 return DeclPtrTy(); 3399 3400 case UnqualifiedId::IK_DestructorName: 3401 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3402 << SS.getRange(); 3403 return DeclPtrTy(); 3404 3405 case UnqualifiedId::IK_TemplateId: 3406 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3407 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3408 return DeclPtrTy(); 3409 } 3410 3411 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3412 if (!TargetName) 3413 return DeclPtrTy(); 3414 3415 // Warn about using declarations. 3416 // TODO: store that the declaration was written without 'using' and 3417 // talk about access decls instead of using decls in the 3418 // diagnostics. 3419 if (!HasUsingKeyword) { 3420 UsingLoc = Name.getSourceRange().getBegin(); 3421 3422 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3423 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3424 } 3425 3426 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3427 Name.getSourceRange().getBegin(), 3428 TargetName, AttrList, 3429 /* IsInstantiation */ false, 3430 IsTypeName, TypenameLoc); 3431 if (UD) 3432 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3433 3434 return DeclPtrTy::make(UD); 3435} 3436 3437/// Determines whether to create a using shadow decl for a particular 3438/// decl, given the set of decls existing prior to this using lookup. 3439bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3440 const LookupResult &Previous) { 3441 // Diagnose finding a decl which is not from a base class of the 3442 // current class. We do this now because there are cases where this 3443 // function will silently decide not to build a shadow decl, which 3444 // will pre-empt further diagnostics. 3445 // 3446 // We don't need to do this in C++0x because we do the check once on 3447 // the qualifier. 3448 // 3449 // FIXME: diagnose the following if we care enough: 3450 // struct A { int foo; }; 3451 // struct B : A { using A::foo; }; 3452 // template <class T> struct C : A {}; 3453 // template <class T> struct D : C<T> { using B::foo; } // <--- 3454 // This is invalid (during instantiation) in C++03 because B::foo 3455 // resolves to the using decl in B, which is not a base class of D<T>. 3456 // We can't diagnose it immediately because C<T> is an unknown 3457 // specialization. The UsingShadowDecl in D<T> then points directly 3458 // to A::foo, which will look well-formed when we instantiate. 3459 // The right solution is to not collapse the shadow-decl chain. 3460 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3461 DeclContext *OrigDC = Orig->getDeclContext(); 3462 3463 // Handle enums and anonymous structs. 3464 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3465 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3466 while (OrigRec->isAnonymousStructOrUnion()) 3467 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3468 3469 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3470 if (OrigDC == CurContext) { 3471 Diag(Using->getLocation(), 3472 diag::err_using_decl_nested_name_specifier_is_current_class) 3473 << Using->getNestedNameRange(); 3474 Diag(Orig->getLocation(), diag::note_using_decl_target); 3475 return true; 3476 } 3477 3478 Diag(Using->getNestedNameRange().getBegin(), 3479 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3480 << Using->getTargetNestedNameDecl() 3481 << cast<CXXRecordDecl>(CurContext) 3482 << Using->getNestedNameRange(); 3483 Diag(Orig->getLocation(), diag::note_using_decl_target); 3484 return true; 3485 } 3486 } 3487 3488 if (Previous.empty()) return false; 3489 3490 NamedDecl *Target = Orig; 3491 if (isa<UsingShadowDecl>(Target)) 3492 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3493 3494 // If the target happens to be one of the previous declarations, we 3495 // don't have a conflict. 3496 // 3497 // FIXME: but we might be increasing its access, in which case we 3498 // should redeclare it. 3499 NamedDecl *NonTag = 0, *Tag = 0; 3500 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3501 I != E; ++I) { 3502 NamedDecl *D = (*I)->getUnderlyingDecl(); 3503 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3504 return false; 3505 3506 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3507 } 3508 3509 if (Target->isFunctionOrFunctionTemplate()) { 3510 FunctionDecl *FD; 3511 if (isa<FunctionTemplateDecl>(Target)) 3512 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3513 else 3514 FD = cast<FunctionDecl>(Target); 3515 3516 NamedDecl *OldDecl = 0; 3517 switch (CheckOverload(FD, Previous, OldDecl)) { 3518 case Ovl_Overload: 3519 return false; 3520 3521 case Ovl_NonFunction: 3522 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3523 break; 3524 3525 // We found a decl with the exact signature. 3526 case Ovl_Match: 3527 if (isa<UsingShadowDecl>(OldDecl)) { 3528 // Silently ignore the possible conflict. 3529 return false; 3530 } 3531 3532 // If we're in a record, we want to hide the target, so we 3533 // return true (without a diagnostic) to tell the caller not to 3534 // build a shadow decl. 3535 if (CurContext->isRecord()) 3536 return true; 3537 3538 // If we're not in a record, this is an error. 3539 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3540 break; 3541 } 3542 3543 Diag(Target->getLocation(), diag::note_using_decl_target); 3544 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3545 return true; 3546 } 3547 3548 // Target is not a function. 3549 3550 if (isa<TagDecl>(Target)) { 3551 // No conflict between a tag and a non-tag. 3552 if (!Tag) return false; 3553 3554 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3555 Diag(Target->getLocation(), diag::note_using_decl_target); 3556 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3557 return true; 3558 } 3559 3560 // No conflict between a tag and a non-tag. 3561 if (!NonTag) return false; 3562 3563 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3564 Diag(Target->getLocation(), diag::note_using_decl_target); 3565 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3566 return true; 3567} 3568 3569/// Builds a shadow declaration corresponding to a 'using' declaration. 3570UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3571 UsingDecl *UD, 3572 NamedDecl *Orig) { 3573 3574 // If we resolved to another shadow declaration, just coalesce them. 3575 NamedDecl *Target = Orig; 3576 if (isa<UsingShadowDecl>(Target)) { 3577 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3578 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3579 } 3580 3581 UsingShadowDecl *Shadow 3582 = UsingShadowDecl::Create(Context, CurContext, 3583 UD->getLocation(), UD, Target); 3584 UD->addShadowDecl(Shadow); 3585 3586 if (S) 3587 PushOnScopeChains(Shadow, S); 3588 else 3589 CurContext->addDecl(Shadow); 3590 Shadow->setAccess(UD->getAccess()); 3591 3592 // Register it as a conversion if appropriate. 3593 if (Shadow->getDeclName().getNameKind() 3594 == DeclarationName::CXXConversionFunctionName) 3595 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3596 3597 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3598 Shadow->setInvalidDecl(); 3599 3600 return Shadow; 3601} 3602 3603/// Hides a using shadow declaration. This is required by the current 3604/// using-decl implementation when a resolvable using declaration in a 3605/// class is followed by a declaration which would hide or override 3606/// one or more of the using decl's targets; for example: 3607/// 3608/// struct Base { void foo(int); }; 3609/// struct Derived : Base { 3610/// using Base::foo; 3611/// void foo(int); 3612/// }; 3613/// 3614/// The governing language is C++03 [namespace.udecl]p12: 3615/// 3616/// When a using-declaration brings names from a base class into a 3617/// derived class scope, member functions in the derived class 3618/// override and/or hide member functions with the same name and 3619/// parameter types in a base class (rather than conflicting). 3620/// 3621/// There are two ways to implement this: 3622/// (1) optimistically create shadow decls when they're not hidden 3623/// by existing declarations, or 3624/// (2) don't create any shadow decls (or at least don't make them 3625/// visible) until we've fully parsed/instantiated the class. 3626/// The problem with (1) is that we might have to retroactively remove 3627/// a shadow decl, which requires several O(n) operations because the 3628/// decl structures are (very reasonably) not designed for removal. 3629/// (2) avoids this but is very fiddly and phase-dependent. 3630void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3631 if (Shadow->getDeclName().getNameKind() == 3632 DeclarationName::CXXConversionFunctionName) 3633 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3634 3635 // Remove it from the DeclContext... 3636 Shadow->getDeclContext()->removeDecl(Shadow); 3637 3638 // ...and the scope, if applicable... 3639 if (S) { 3640 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3641 IdResolver.RemoveDecl(Shadow); 3642 } 3643 3644 // ...and the using decl. 3645 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3646 3647 // TODO: complain somehow if Shadow was used. It shouldn't 3648 // be possible for this to happen, because...? 3649} 3650 3651/// Builds a using declaration. 3652/// 3653/// \param IsInstantiation - Whether this call arises from an 3654/// instantiation of an unresolved using declaration. We treat 3655/// the lookup differently for these declarations. 3656NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3657 SourceLocation UsingLoc, 3658 CXXScopeSpec &SS, 3659 SourceLocation IdentLoc, 3660 DeclarationName Name, 3661 AttributeList *AttrList, 3662 bool IsInstantiation, 3663 bool IsTypeName, 3664 SourceLocation TypenameLoc) { 3665 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3666 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3667 3668 // FIXME: We ignore attributes for now. 3669 delete AttrList; 3670 3671 if (SS.isEmpty()) { 3672 Diag(IdentLoc, diag::err_using_requires_qualname); 3673 return 0; 3674 } 3675 3676 // Do the redeclaration lookup in the current scope. 3677 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3678 ForRedeclaration); 3679 Previous.setHideTags(false); 3680 if (S) { 3681 LookupName(Previous, S); 3682 3683 // It is really dumb that we have to do this. 3684 LookupResult::Filter F = Previous.makeFilter(); 3685 while (F.hasNext()) { 3686 NamedDecl *D = F.next(); 3687 if (!isDeclInScope(D, CurContext, S)) 3688 F.erase(); 3689 } 3690 F.done(); 3691 } else { 3692 assert(IsInstantiation && "no scope in non-instantiation"); 3693 assert(CurContext->isRecord() && "scope not record in instantiation"); 3694 LookupQualifiedName(Previous, CurContext); 3695 } 3696 3697 NestedNameSpecifier *NNS = 3698 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3699 3700 // Check for invalid redeclarations. 3701 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3702 return 0; 3703 3704 // Check for bad qualifiers. 3705 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3706 return 0; 3707 3708 DeclContext *LookupContext = computeDeclContext(SS); 3709 NamedDecl *D; 3710 if (!LookupContext) { 3711 if (IsTypeName) { 3712 // FIXME: not all declaration name kinds are legal here 3713 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3714 UsingLoc, TypenameLoc, 3715 SS.getRange(), NNS, 3716 IdentLoc, Name); 3717 } else { 3718 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3719 UsingLoc, SS.getRange(), NNS, 3720 IdentLoc, Name); 3721 } 3722 } else { 3723 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3724 SS.getRange(), UsingLoc, NNS, Name, 3725 IsTypeName); 3726 } 3727 D->setAccess(AS); 3728 CurContext->addDecl(D); 3729 3730 if (!LookupContext) return D; 3731 UsingDecl *UD = cast<UsingDecl>(D); 3732 3733 if (RequireCompleteDeclContext(SS)) { 3734 UD->setInvalidDecl(); 3735 return UD; 3736 } 3737 3738 // Look up the target name. 3739 3740 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3741 3742 // Unlike most lookups, we don't always want to hide tag 3743 // declarations: tag names are visible through the using declaration 3744 // even if hidden by ordinary names, *except* in a dependent context 3745 // where it's important for the sanity of two-phase lookup. 3746 if (!IsInstantiation) 3747 R.setHideTags(false); 3748 3749 LookupQualifiedName(R, LookupContext); 3750 3751 if (R.empty()) { 3752 Diag(IdentLoc, diag::err_no_member) 3753 << Name << LookupContext << SS.getRange(); 3754 UD->setInvalidDecl(); 3755 return UD; 3756 } 3757 3758 if (R.isAmbiguous()) { 3759 UD->setInvalidDecl(); 3760 return UD; 3761 } 3762 3763 if (IsTypeName) { 3764 // If we asked for a typename and got a non-type decl, error out. 3765 if (!R.getAsSingle<TypeDecl>()) { 3766 Diag(IdentLoc, diag::err_using_typename_non_type); 3767 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3768 Diag((*I)->getUnderlyingDecl()->getLocation(), 3769 diag::note_using_decl_target); 3770 UD->setInvalidDecl(); 3771 return UD; 3772 } 3773 } else { 3774 // If we asked for a non-typename and we got a type, error out, 3775 // but only if this is an instantiation of an unresolved using 3776 // decl. Otherwise just silently find the type name. 3777 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3778 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3779 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3780 UD->setInvalidDecl(); 3781 return UD; 3782 } 3783 } 3784 3785 // C++0x N2914 [namespace.udecl]p6: 3786 // A using-declaration shall not name a namespace. 3787 if (R.getAsSingle<NamespaceDecl>()) { 3788 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3789 << SS.getRange(); 3790 UD->setInvalidDecl(); 3791 return UD; 3792 } 3793 3794 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3795 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3796 BuildUsingShadowDecl(S, UD, *I); 3797 } 3798 3799 return UD; 3800} 3801 3802/// Checks that the given using declaration is not an invalid 3803/// redeclaration. Note that this is checking only for the using decl 3804/// itself, not for any ill-formedness among the UsingShadowDecls. 3805bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3806 bool isTypeName, 3807 const CXXScopeSpec &SS, 3808 SourceLocation NameLoc, 3809 const LookupResult &Prev) { 3810 // C++03 [namespace.udecl]p8: 3811 // C++0x [namespace.udecl]p10: 3812 // A using-declaration is a declaration and can therefore be used 3813 // repeatedly where (and only where) multiple declarations are 3814 // allowed. 3815 // That's only in file contexts. 3816 if (CurContext->getLookupContext()->isFileContext()) 3817 return false; 3818 3819 NestedNameSpecifier *Qual 3820 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3821 3822 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3823 NamedDecl *D = *I; 3824 3825 bool DTypename; 3826 NestedNameSpecifier *DQual; 3827 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3828 DTypename = UD->isTypeName(); 3829 DQual = UD->getTargetNestedNameDecl(); 3830 } else if (UnresolvedUsingValueDecl *UD 3831 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3832 DTypename = false; 3833 DQual = UD->getTargetNestedNameSpecifier(); 3834 } else if (UnresolvedUsingTypenameDecl *UD 3835 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3836 DTypename = true; 3837 DQual = UD->getTargetNestedNameSpecifier(); 3838 } else continue; 3839 3840 // using decls differ if one says 'typename' and the other doesn't. 3841 // FIXME: non-dependent using decls? 3842 if (isTypeName != DTypename) continue; 3843 3844 // using decls differ if they name different scopes (but note that 3845 // template instantiation can cause this check to trigger when it 3846 // didn't before instantiation). 3847 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3848 Context.getCanonicalNestedNameSpecifier(DQual)) 3849 continue; 3850 3851 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3852 Diag(D->getLocation(), diag::note_using_decl) << 1; 3853 return true; 3854 } 3855 3856 return false; 3857} 3858 3859 3860/// Checks that the given nested-name qualifier used in a using decl 3861/// in the current context is appropriately related to the current 3862/// scope. If an error is found, diagnoses it and returns true. 3863bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3864 const CXXScopeSpec &SS, 3865 SourceLocation NameLoc) { 3866 DeclContext *NamedContext = computeDeclContext(SS); 3867 3868 if (!CurContext->isRecord()) { 3869 // C++03 [namespace.udecl]p3: 3870 // C++0x [namespace.udecl]p8: 3871 // A using-declaration for a class member shall be a member-declaration. 3872 3873 // If we weren't able to compute a valid scope, it must be a 3874 // dependent class scope. 3875 if (!NamedContext || NamedContext->isRecord()) { 3876 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3877 << SS.getRange(); 3878 return true; 3879 } 3880 3881 // Otherwise, everything is known to be fine. 3882 return false; 3883 } 3884 3885 // The current scope is a record. 3886 3887 // If the named context is dependent, we can't decide much. 3888 if (!NamedContext) { 3889 // FIXME: in C++0x, we can diagnose if we can prove that the 3890 // nested-name-specifier does not refer to a base class, which is 3891 // still possible in some cases. 3892 3893 // Otherwise we have to conservatively report that things might be 3894 // okay. 3895 return false; 3896 } 3897 3898 if (!NamedContext->isRecord()) { 3899 // Ideally this would point at the last name in the specifier, 3900 // but we don't have that level of source info. 3901 Diag(SS.getRange().getBegin(), 3902 diag::err_using_decl_nested_name_specifier_is_not_class) 3903 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3904 return true; 3905 } 3906 3907 if (getLangOptions().CPlusPlus0x) { 3908 // C++0x [namespace.udecl]p3: 3909 // In a using-declaration used as a member-declaration, the 3910 // nested-name-specifier shall name a base class of the class 3911 // being defined. 3912 3913 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3914 cast<CXXRecordDecl>(NamedContext))) { 3915 if (CurContext == NamedContext) { 3916 Diag(NameLoc, 3917 diag::err_using_decl_nested_name_specifier_is_current_class) 3918 << SS.getRange(); 3919 return true; 3920 } 3921 3922 Diag(SS.getRange().getBegin(), 3923 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3924 << (NestedNameSpecifier*) SS.getScopeRep() 3925 << cast<CXXRecordDecl>(CurContext) 3926 << SS.getRange(); 3927 return true; 3928 } 3929 3930 return false; 3931 } 3932 3933 // C++03 [namespace.udecl]p4: 3934 // A using-declaration used as a member-declaration shall refer 3935 // to a member of a base class of the class being defined [etc.]. 3936 3937 // Salient point: SS doesn't have to name a base class as long as 3938 // lookup only finds members from base classes. Therefore we can 3939 // diagnose here only if we can prove that that can't happen, 3940 // i.e. if the class hierarchies provably don't intersect. 3941 3942 // TODO: it would be nice if "definitely valid" results were cached 3943 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3944 // need to be repeated. 3945 3946 struct UserData { 3947 llvm::DenseSet<const CXXRecordDecl*> Bases; 3948 3949 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3950 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3951 Data->Bases.insert(Base); 3952 return true; 3953 } 3954 3955 bool hasDependentBases(const CXXRecordDecl *Class) { 3956 return !Class->forallBases(collect, this); 3957 } 3958 3959 /// Returns true if the base is dependent or is one of the 3960 /// accumulated base classes. 3961 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3962 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3963 return !Data->Bases.count(Base); 3964 } 3965 3966 bool mightShareBases(const CXXRecordDecl *Class) { 3967 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3968 } 3969 }; 3970 3971 UserData Data; 3972 3973 // Returns false if we find a dependent base. 3974 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3975 return false; 3976 3977 // Returns false if the class has a dependent base or if it or one 3978 // of its bases is present in the base set of the current context. 3979 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3980 return false; 3981 3982 Diag(SS.getRange().getBegin(), 3983 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3984 << (NestedNameSpecifier*) SS.getScopeRep() 3985 << cast<CXXRecordDecl>(CurContext) 3986 << SS.getRange(); 3987 3988 return true; 3989} 3990 3991Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3992 SourceLocation NamespaceLoc, 3993 SourceLocation AliasLoc, 3994 IdentifierInfo *Alias, 3995 CXXScopeSpec &SS, 3996 SourceLocation IdentLoc, 3997 IdentifierInfo *Ident) { 3998 3999 // Lookup the namespace name. 4000 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4001 LookupParsedName(R, S, &SS); 4002 4003 // Check if we have a previous declaration with the same name. 4004 if (NamedDecl *PrevDecl 4005 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4006 ForRedeclaration)) { 4007 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4008 // We already have an alias with the same name that points to the same 4009 // namespace, so don't create a new one. 4010 // FIXME: At some point, we'll want to create the (redundant) 4011 // declaration to maintain better source information. 4012 if (!R.isAmbiguous() && !R.empty() && 4013 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4014 return DeclPtrTy(); 4015 } 4016 4017 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4018 diag::err_redefinition_different_kind; 4019 Diag(AliasLoc, DiagID) << Alias; 4020 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4021 return DeclPtrTy(); 4022 } 4023 4024 if (R.isAmbiguous()) 4025 return DeclPtrTy(); 4026 4027 if (R.empty()) { 4028 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4029 return DeclPtrTy(); 4030 } 4031 4032 NamespaceAliasDecl *AliasDecl = 4033 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4034 Alias, SS.getRange(), 4035 (NestedNameSpecifier *)SS.getScopeRep(), 4036 IdentLoc, R.getFoundDecl()); 4037 4038 PushOnScopeChains(AliasDecl, S); 4039 return DeclPtrTy::make(AliasDecl); 4040} 4041 4042void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4043 CXXConstructorDecl *Constructor) { 4044 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4045 !Constructor->isUsed()) && 4046 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4047 4048 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4049 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4050 4051 DeclContext *PreviousContext = CurContext; 4052 CurContext = Constructor; 4053 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 4054 Diag(CurrentLocation, diag::note_member_synthesized_at) 4055 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4056 Constructor->setInvalidDecl(); 4057 } else { 4058 Constructor->setUsed(); 4059 } 4060 CurContext = PreviousContext; 4061} 4062 4063void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4064 CXXDestructorDecl *Destructor) { 4065 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4066 "DefineImplicitDestructor - call it for implicit default dtor"); 4067 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4068 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4069 4070 DeclContext *PreviousContext = CurContext; 4071 CurContext = Destructor; 4072 4073 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4074 Destructor->getParent()); 4075 4076 // FIXME: If CheckDestructor fails, we should emit a note about where the 4077 // implicit destructor was needed. 4078 if (CheckDestructor(Destructor)) { 4079 Diag(CurrentLocation, diag::note_member_synthesized_at) 4080 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4081 4082 Destructor->setInvalidDecl(); 4083 CurContext = PreviousContext; 4084 4085 return; 4086 } 4087 CurContext = PreviousContext; 4088 4089 Destructor->setUsed(); 4090} 4091 4092void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 4093 CXXMethodDecl *MethodDecl) { 4094 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 4095 MethodDecl->getOverloadedOperator() == OO_Equal && 4096 !MethodDecl->isUsed()) && 4097 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 4098 4099 CXXRecordDecl *ClassDecl 4100 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 4101 4102 DeclContext *PreviousContext = CurContext; 4103 CurContext = MethodDecl; 4104 4105 // C++[class.copy] p12 4106 // Before the implicitly-declared copy assignment operator for a class is 4107 // implicitly defined, all implicitly-declared copy assignment operators 4108 // for its direct base classes and its nonstatic data members shall have 4109 // been implicitly defined. 4110 bool err = false; 4111 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4112 E = ClassDecl->bases_end(); Base != E; ++Base) { 4113 CXXRecordDecl *BaseClassDecl 4114 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4115 if (CXXMethodDecl *BaseAssignOpMethod = 4116 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4117 BaseClassDecl)) { 4118 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4119 BaseAssignOpMethod, 4120 PDiag(diag::err_access_assign_base) 4121 << Base->getType()); 4122 4123 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 4124 } 4125 } 4126 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4127 E = ClassDecl->field_end(); Field != E; ++Field) { 4128 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4129 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4130 FieldType = Array->getElementType(); 4131 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4132 CXXRecordDecl *FieldClassDecl 4133 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4134 if (CXXMethodDecl *FieldAssignOpMethod = 4135 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4136 FieldClassDecl)) { 4137 CheckDirectMemberAccess(Field->getLocation(), 4138 FieldAssignOpMethod, 4139 PDiag(diag::err_access_assign_field) 4140 << Field->getDeclName() << Field->getType()); 4141 4142 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 4143 } 4144 } else if (FieldType->isReferenceType()) { 4145 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4146 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4147 Diag(Field->getLocation(), diag::note_declared_at); 4148 Diag(CurrentLocation, diag::note_first_required_here); 4149 err = true; 4150 } else if (FieldType.isConstQualified()) { 4151 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4152 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4153 Diag(Field->getLocation(), diag::note_declared_at); 4154 Diag(CurrentLocation, diag::note_first_required_here); 4155 err = true; 4156 } 4157 } 4158 if (!err) 4159 MethodDecl->setUsed(); 4160 4161 CurContext = PreviousContext; 4162} 4163 4164CXXMethodDecl * 4165Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4166 ParmVarDecl *ParmDecl, 4167 CXXRecordDecl *ClassDecl) { 4168 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4169 QualType RHSType(LHSType); 4170 // If class's assignment operator argument is const/volatile qualified, 4171 // look for operator = (const/volatile B&). Otherwise, look for 4172 // operator = (B&). 4173 RHSType = Context.getCVRQualifiedType(RHSType, 4174 ParmDecl->getType().getCVRQualifiers()); 4175 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4176 LHSType, 4177 SourceLocation())); 4178 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4179 RHSType, 4180 CurrentLocation)); 4181 Expr *Args[2] = { &*LHS, &*RHS }; 4182 OverloadCandidateSet CandidateSet(CurrentLocation); 4183 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4184 CandidateSet); 4185 OverloadCandidateSet::iterator Best; 4186 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4187 return cast<CXXMethodDecl>(Best->Function); 4188 assert(false && 4189 "getAssignOperatorMethod - copy assignment operator method not found"); 4190 return 0; 4191} 4192 4193void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4194 CXXConstructorDecl *CopyConstructor, 4195 unsigned TypeQuals) { 4196 assert((CopyConstructor->isImplicit() && 4197 CopyConstructor->isCopyConstructor(TypeQuals) && 4198 !CopyConstructor->isUsed()) && 4199 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4200 4201 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4202 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4203 4204 DeclContext *PreviousContext = CurContext; 4205 CurContext = CopyConstructor; 4206 4207 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false)) { 4208 Diag(CurrentLocation, diag::note_member_synthesized_at) 4209 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4210 CopyConstructor->setInvalidDecl(); 4211 } else { 4212 CopyConstructor->setUsed(); 4213 } 4214 4215 // FIXME: Once we teach SetBaseOrMemberInitializers to copy fields, we can 4216 // get rid of this code. 4217 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4218 FieldEnd = ClassDecl->field_end(); 4219 Field != FieldEnd; ++Field) { 4220 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4221 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4222 FieldType = Array->getElementType(); 4223 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4224 CXXRecordDecl *FieldClassDecl 4225 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4226 if (CXXConstructorDecl *FieldCopyCtor = 4227 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4228 CheckDirectMemberAccess(Field->getLocation(), 4229 FieldCopyCtor, 4230 PDiag(diag::err_access_copy_field) 4231 << Field->getDeclName() << Field->getType()); 4232 4233 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4234 } 4235 } 4236 } 4237 CopyConstructor->setUsed(); 4238 4239 CurContext = PreviousContext; 4240} 4241 4242Sema::OwningExprResult 4243Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4244 CXXConstructorDecl *Constructor, 4245 MultiExprArg ExprArgs, 4246 bool RequiresZeroInit, 4247 bool BaseInitialization) { 4248 bool Elidable = false; 4249 4250 // C++0x [class.copy]p34: 4251 // When certain criteria are met, an implementation is allowed to 4252 // omit the copy/move construction of a class object, even if the 4253 // copy/move constructor and/or destructor for the object have 4254 // side effects. [...] 4255 // - when a temporary class object that has not been bound to a 4256 // reference (12.2) would be copied/moved to a class object 4257 // with the same cv-unqualified type, the copy/move operation 4258 // can be omitted by constructing the temporary object 4259 // directly into the target of the omitted copy/move 4260 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4261 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4262 Elidable = SubExpr->isTemporaryObject() && 4263 Context.hasSameUnqualifiedType(SubExpr->getType(), 4264 Context.getTypeDeclType(Constructor->getParent())); 4265 } 4266 4267 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4268 Elidable, move(ExprArgs), RequiresZeroInit, 4269 BaseInitialization); 4270} 4271 4272/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4273/// including handling of its default argument expressions. 4274Sema::OwningExprResult 4275Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4276 CXXConstructorDecl *Constructor, bool Elidable, 4277 MultiExprArg ExprArgs, 4278 bool RequiresZeroInit, 4279 bool BaseInitialization) { 4280 unsigned NumExprs = ExprArgs.size(); 4281 Expr **Exprs = (Expr **)ExprArgs.release(); 4282 4283 MarkDeclarationReferenced(ConstructLoc, Constructor); 4284 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4285 Constructor, Elidable, Exprs, NumExprs, 4286 RequiresZeroInit, BaseInitialization)); 4287} 4288 4289bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4290 CXXConstructorDecl *Constructor, 4291 MultiExprArg Exprs) { 4292 OwningExprResult TempResult = 4293 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4294 move(Exprs)); 4295 if (TempResult.isInvalid()) 4296 return true; 4297 4298 Expr *Temp = TempResult.takeAs<Expr>(); 4299 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4300 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4301 VD->setInit(Temp); 4302 4303 return false; 4304} 4305 4306void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4307 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4308 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4309 !ClassDecl->hasTrivialDestructor()) { 4310 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4311 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4312 CheckDestructorAccess(VD->getLocation(), Destructor, 4313 PDiag(diag::err_access_dtor_var) 4314 << VD->getDeclName() 4315 << VD->getType()); 4316 } 4317} 4318 4319/// AddCXXDirectInitializerToDecl - This action is called immediately after 4320/// ActOnDeclarator, when a C++ direct initializer is present. 4321/// e.g: "int x(1);" 4322void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4323 SourceLocation LParenLoc, 4324 MultiExprArg Exprs, 4325 SourceLocation *CommaLocs, 4326 SourceLocation RParenLoc) { 4327 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4328 Decl *RealDecl = Dcl.getAs<Decl>(); 4329 4330 // If there is no declaration, there was an error parsing it. Just ignore 4331 // the initializer. 4332 if (RealDecl == 0) 4333 return; 4334 4335 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4336 if (!VDecl) { 4337 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4338 RealDecl->setInvalidDecl(); 4339 return; 4340 } 4341 4342 // We will represent direct-initialization similarly to copy-initialization: 4343 // int x(1); -as-> int x = 1; 4344 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4345 // 4346 // Clients that want to distinguish between the two forms, can check for 4347 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4348 // A major benefit is that clients that don't particularly care about which 4349 // exactly form was it (like the CodeGen) can handle both cases without 4350 // special case code. 4351 4352 // C++ 8.5p11: 4353 // The form of initialization (using parentheses or '=') is generally 4354 // insignificant, but does matter when the entity being initialized has a 4355 // class type. 4356 QualType DeclInitType = VDecl->getType(); 4357 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4358 DeclInitType = Context.getBaseElementType(Array); 4359 4360 if (!VDecl->getType()->isDependentType() && 4361 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4362 diag::err_typecheck_decl_incomplete_type)) { 4363 VDecl->setInvalidDecl(); 4364 return; 4365 } 4366 4367 // The variable can not have an abstract class type. 4368 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4369 diag::err_abstract_type_in_decl, 4370 AbstractVariableType)) 4371 VDecl->setInvalidDecl(); 4372 4373 const VarDecl *Def; 4374 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4375 Diag(VDecl->getLocation(), diag::err_redefinition) 4376 << VDecl->getDeclName(); 4377 Diag(Def->getLocation(), diag::note_previous_definition); 4378 VDecl->setInvalidDecl(); 4379 return; 4380 } 4381 4382 // If either the declaration has a dependent type or if any of the 4383 // expressions is type-dependent, we represent the initialization 4384 // via a ParenListExpr for later use during template instantiation. 4385 if (VDecl->getType()->isDependentType() || 4386 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4387 // Let clients know that initialization was done with a direct initializer. 4388 VDecl->setCXXDirectInitializer(true); 4389 4390 // Store the initialization expressions as a ParenListExpr. 4391 unsigned NumExprs = Exprs.size(); 4392 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4393 (Expr **)Exprs.release(), 4394 NumExprs, RParenLoc)); 4395 return; 4396 } 4397 4398 // Capture the variable that is being initialized and the style of 4399 // initialization. 4400 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4401 4402 // FIXME: Poor source location information. 4403 InitializationKind Kind 4404 = InitializationKind::CreateDirect(VDecl->getLocation(), 4405 LParenLoc, RParenLoc); 4406 4407 InitializationSequence InitSeq(*this, Entity, Kind, 4408 (Expr**)Exprs.get(), Exprs.size()); 4409 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4410 if (Result.isInvalid()) { 4411 VDecl->setInvalidDecl(); 4412 return; 4413 } 4414 4415 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4416 VDecl->setInit(Result.takeAs<Expr>()); 4417 VDecl->setCXXDirectInitializer(true); 4418 4419 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4420 FinalizeVarWithDestructor(VDecl, Record); 4421} 4422 4423/// \brief Given a constructor and the set of arguments provided for the 4424/// constructor, convert the arguments and add any required default arguments 4425/// to form a proper call to this constructor. 4426/// 4427/// \returns true if an error occurred, false otherwise. 4428bool 4429Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4430 MultiExprArg ArgsPtr, 4431 SourceLocation Loc, 4432 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4433 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4434 unsigned NumArgs = ArgsPtr.size(); 4435 Expr **Args = (Expr **)ArgsPtr.get(); 4436 4437 const FunctionProtoType *Proto 4438 = Constructor->getType()->getAs<FunctionProtoType>(); 4439 assert(Proto && "Constructor without a prototype?"); 4440 unsigned NumArgsInProto = Proto->getNumArgs(); 4441 4442 // If too few arguments are available, we'll fill in the rest with defaults. 4443 if (NumArgs < NumArgsInProto) 4444 ConvertedArgs.reserve(NumArgsInProto); 4445 else 4446 ConvertedArgs.reserve(NumArgs); 4447 4448 VariadicCallType CallType = 4449 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4450 llvm::SmallVector<Expr *, 8> AllArgs; 4451 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4452 Proto, 0, Args, NumArgs, AllArgs, 4453 CallType); 4454 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4455 ConvertedArgs.push_back(AllArgs[i]); 4456 return Invalid; 4457} 4458 4459static inline bool 4460CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4461 const FunctionDecl *FnDecl) { 4462 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4463 if (isa<NamespaceDecl>(DC)) { 4464 return SemaRef.Diag(FnDecl->getLocation(), 4465 diag::err_operator_new_delete_declared_in_namespace) 4466 << FnDecl->getDeclName(); 4467 } 4468 4469 if (isa<TranslationUnitDecl>(DC) && 4470 FnDecl->getStorageClass() == FunctionDecl::Static) { 4471 return SemaRef.Diag(FnDecl->getLocation(), 4472 diag::err_operator_new_delete_declared_static) 4473 << FnDecl->getDeclName(); 4474 } 4475 4476 return false; 4477} 4478 4479static inline bool 4480CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4481 CanQualType ExpectedResultType, 4482 CanQualType ExpectedFirstParamType, 4483 unsigned DependentParamTypeDiag, 4484 unsigned InvalidParamTypeDiag) { 4485 QualType ResultType = 4486 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4487 4488 // Check that the result type is not dependent. 4489 if (ResultType->isDependentType()) 4490 return SemaRef.Diag(FnDecl->getLocation(), 4491 diag::err_operator_new_delete_dependent_result_type) 4492 << FnDecl->getDeclName() << ExpectedResultType; 4493 4494 // Check that the result type is what we expect. 4495 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4496 return SemaRef.Diag(FnDecl->getLocation(), 4497 diag::err_operator_new_delete_invalid_result_type) 4498 << FnDecl->getDeclName() << ExpectedResultType; 4499 4500 // A function template must have at least 2 parameters. 4501 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4502 return SemaRef.Diag(FnDecl->getLocation(), 4503 diag::err_operator_new_delete_template_too_few_parameters) 4504 << FnDecl->getDeclName(); 4505 4506 // The function decl must have at least 1 parameter. 4507 if (FnDecl->getNumParams() == 0) 4508 return SemaRef.Diag(FnDecl->getLocation(), 4509 diag::err_operator_new_delete_too_few_parameters) 4510 << FnDecl->getDeclName(); 4511 4512 // Check the the first parameter type is not dependent. 4513 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4514 if (FirstParamType->isDependentType()) 4515 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4516 << FnDecl->getDeclName() << ExpectedFirstParamType; 4517 4518 // Check that the first parameter type is what we expect. 4519 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4520 ExpectedFirstParamType) 4521 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4522 << FnDecl->getDeclName() << ExpectedFirstParamType; 4523 4524 return false; 4525} 4526 4527static bool 4528CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4529 // C++ [basic.stc.dynamic.allocation]p1: 4530 // A program is ill-formed if an allocation function is declared in a 4531 // namespace scope other than global scope or declared static in global 4532 // scope. 4533 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4534 return true; 4535 4536 CanQualType SizeTy = 4537 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4538 4539 // C++ [basic.stc.dynamic.allocation]p1: 4540 // The return type shall be void*. The first parameter shall have type 4541 // std::size_t. 4542 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4543 SizeTy, 4544 diag::err_operator_new_dependent_param_type, 4545 diag::err_operator_new_param_type)) 4546 return true; 4547 4548 // C++ [basic.stc.dynamic.allocation]p1: 4549 // The first parameter shall not have an associated default argument. 4550 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4551 return SemaRef.Diag(FnDecl->getLocation(), 4552 diag::err_operator_new_default_arg) 4553 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4554 4555 return false; 4556} 4557 4558static bool 4559CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4560 // C++ [basic.stc.dynamic.deallocation]p1: 4561 // A program is ill-formed if deallocation functions are declared in a 4562 // namespace scope other than global scope or declared static in global 4563 // scope. 4564 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4565 return true; 4566 4567 // C++ [basic.stc.dynamic.deallocation]p2: 4568 // Each deallocation function shall return void and its first parameter 4569 // shall be void*. 4570 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4571 SemaRef.Context.VoidPtrTy, 4572 diag::err_operator_delete_dependent_param_type, 4573 diag::err_operator_delete_param_type)) 4574 return true; 4575 4576 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4577 if (FirstParamType->isDependentType()) 4578 return SemaRef.Diag(FnDecl->getLocation(), 4579 diag::err_operator_delete_dependent_param_type) 4580 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4581 4582 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4583 SemaRef.Context.VoidPtrTy) 4584 return SemaRef.Diag(FnDecl->getLocation(), 4585 diag::err_operator_delete_param_type) 4586 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4587 4588 return false; 4589} 4590 4591/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4592/// of this overloaded operator is well-formed. If so, returns false; 4593/// otherwise, emits appropriate diagnostics and returns true. 4594bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4595 assert(FnDecl && FnDecl->isOverloadedOperator() && 4596 "Expected an overloaded operator declaration"); 4597 4598 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4599 4600 // C++ [over.oper]p5: 4601 // The allocation and deallocation functions, operator new, 4602 // operator new[], operator delete and operator delete[], are 4603 // described completely in 3.7.3. The attributes and restrictions 4604 // found in the rest of this subclause do not apply to them unless 4605 // explicitly stated in 3.7.3. 4606 if (Op == OO_Delete || Op == OO_Array_Delete) 4607 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4608 4609 if (Op == OO_New || Op == OO_Array_New) 4610 return CheckOperatorNewDeclaration(*this, FnDecl); 4611 4612 // C++ [over.oper]p6: 4613 // An operator function shall either be a non-static member 4614 // function or be a non-member function and have at least one 4615 // parameter whose type is a class, a reference to a class, an 4616 // enumeration, or a reference to an enumeration. 4617 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4618 if (MethodDecl->isStatic()) 4619 return Diag(FnDecl->getLocation(), 4620 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4621 } else { 4622 bool ClassOrEnumParam = false; 4623 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4624 ParamEnd = FnDecl->param_end(); 4625 Param != ParamEnd; ++Param) { 4626 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4627 if (ParamType->isDependentType() || ParamType->isRecordType() || 4628 ParamType->isEnumeralType()) { 4629 ClassOrEnumParam = true; 4630 break; 4631 } 4632 } 4633 4634 if (!ClassOrEnumParam) 4635 return Diag(FnDecl->getLocation(), 4636 diag::err_operator_overload_needs_class_or_enum) 4637 << FnDecl->getDeclName(); 4638 } 4639 4640 // C++ [over.oper]p8: 4641 // An operator function cannot have default arguments (8.3.6), 4642 // except where explicitly stated below. 4643 // 4644 // Only the function-call operator allows default arguments 4645 // (C++ [over.call]p1). 4646 if (Op != OO_Call) { 4647 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4648 Param != FnDecl->param_end(); ++Param) { 4649 if ((*Param)->hasDefaultArg()) 4650 return Diag((*Param)->getLocation(), 4651 diag::err_operator_overload_default_arg) 4652 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4653 } 4654 } 4655 4656 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4657 { false, false, false } 4658#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4659 , { Unary, Binary, MemberOnly } 4660#include "clang/Basic/OperatorKinds.def" 4661 }; 4662 4663 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4664 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4665 bool MustBeMemberOperator = OperatorUses[Op][2]; 4666 4667 // C++ [over.oper]p8: 4668 // [...] Operator functions cannot have more or fewer parameters 4669 // than the number required for the corresponding operator, as 4670 // described in the rest of this subclause. 4671 unsigned NumParams = FnDecl->getNumParams() 4672 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4673 if (Op != OO_Call && 4674 ((NumParams == 1 && !CanBeUnaryOperator) || 4675 (NumParams == 2 && !CanBeBinaryOperator) || 4676 (NumParams < 1) || (NumParams > 2))) { 4677 // We have the wrong number of parameters. 4678 unsigned ErrorKind; 4679 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4680 ErrorKind = 2; // 2 -> unary or binary. 4681 } else if (CanBeUnaryOperator) { 4682 ErrorKind = 0; // 0 -> unary 4683 } else { 4684 assert(CanBeBinaryOperator && 4685 "All non-call overloaded operators are unary or binary!"); 4686 ErrorKind = 1; // 1 -> binary 4687 } 4688 4689 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4690 << FnDecl->getDeclName() << NumParams << ErrorKind; 4691 } 4692 4693 // Overloaded operators other than operator() cannot be variadic. 4694 if (Op != OO_Call && 4695 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4696 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4697 << FnDecl->getDeclName(); 4698 } 4699 4700 // Some operators must be non-static member functions. 4701 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4702 return Diag(FnDecl->getLocation(), 4703 diag::err_operator_overload_must_be_member) 4704 << FnDecl->getDeclName(); 4705 } 4706 4707 // C++ [over.inc]p1: 4708 // The user-defined function called operator++ implements the 4709 // prefix and postfix ++ operator. If this function is a member 4710 // function with no parameters, or a non-member function with one 4711 // parameter of class or enumeration type, it defines the prefix 4712 // increment operator ++ for objects of that type. If the function 4713 // is a member function with one parameter (which shall be of type 4714 // int) or a non-member function with two parameters (the second 4715 // of which shall be of type int), it defines the postfix 4716 // increment operator ++ for objects of that type. 4717 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4718 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4719 bool ParamIsInt = false; 4720 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4721 ParamIsInt = BT->getKind() == BuiltinType::Int; 4722 4723 if (!ParamIsInt) 4724 return Diag(LastParam->getLocation(), 4725 diag::err_operator_overload_post_incdec_must_be_int) 4726 << LastParam->getType() << (Op == OO_MinusMinus); 4727 } 4728 4729 // Notify the class if it got an assignment operator. 4730 if (Op == OO_Equal) { 4731 // Would have returned earlier otherwise. 4732 assert(isa<CXXMethodDecl>(FnDecl) && 4733 "Overloaded = not member, but not filtered."); 4734 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4735 Method->getParent()->addedAssignmentOperator(Context, Method); 4736 } 4737 4738 return false; 4739} 4740 4741/// CheckLiteralOperatorDeclaration - Check whether the declaration 4742/// of this literal operator function is well-formed. If so, returns 4743/// false; otherwise, emits appropriate diagnostics and returns true. 4744bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4745 DeclContext *DC = FnDecl->getDeclContext(); 4746 Decl::Kind Kind = DC->getDeclKind(); 4747 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4748 Kind != Decl::LinkageSpec) { 4749 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4750 << FnDecl->getDeclName(); 4751 return true; 4752 } 4753 4754 bool Valid = false; 4755 4756 // template <char...> type operator "" name() is the only valid template 4757 // signature, and the only valid signature with no parameters. 4758 if (FnDecl->param_size() == 0) { 4759 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4760 // Must have only one template parameter 4761 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4762 if (Params->size() == 1) { 4763 NonTypeTemplateParmDecl *PmDecl = 4764 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4765 4766 // The template parameter must be a char parameter pack. 4767 // FIXME: This test will always fail because non-type parameter packs 4768 // have not been implemented. 4769 if (PmDecl && PmDecl->isTemplateParameterPack() && 4770 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4771 Valid = true; 4772 } 4773 } 4774 } else { 4775 // Check the first parameter 4776 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4777 4778 QualType T = (*Param)->getType(); 4779 4780 // unsigned long long int, long double, and any character type are allowed 4781 // as the only parameters. 4782 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4783 Context.hasSameType(T, Context.LongDoubleTy) || 4784 Context.hasSameType(T, Context.CharTy) || 4785 Context.hasSameType(T, Context.WCharTy) || 4786 Context.hasSameType(T, Context.Char16Ty) || 4787 Context.hasSameType(T, Context.Char32Ty)) { 4788 if (++Param == FnDecl->param_end()) 4789 Valid = true; 4790 goto FinishedParams; 4791 } 4792 4793 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4794 const PointerType *PT = T->getAs<PointerType>(); 4795 if (!PT) 4796 goto FinishedParams; 4797 T = PT->getPointeeType(); 4798 if (!T.isConstQualified()) 4799 goto FinishedParams; 4800 T = T.getUnqualifiedType(); 4801 4802 // Move on to the second parameter; 4803 ++Param; 4804 4805 // If there is no second parameter, the first must be a const char * 4806 if (Param == FnDecl->param_end()) { 4807 if (Context.hasSameType(T, Context.CharTy)) 4808 Valid = true; 4809 goto FinishedParams; 4810 } 4811 4812 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4813 // are allowed as the first parameter to a two-parameter function 4814 if (!(Context.hasSameType(T, Context.CharTy) || 4815 Context.hasSameType(T, Context.WCharTy) || 4816 Context.hasSameType(T, Context.Char16Ty) || 4817 Context.hasSameType(T, Context.Char32Ty))) 4818 goto FinishedParams; 4819 4820 // The second and final parameter must be an std::size_t 4821 T = (*Param)->getType().getUnqualifiedType(); 4822 if (Context.hasSameType(T, Context.getSizeType()) && 4823 ++Param == FnDecl->param_end()) 4824 Valid = true; 4825 } 4826 4827 // FIXME: This diagnostic is absolutely terrible. 4828FinishedParams: 4829 if (!Valid) { 4830 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4831 << FnDecl->getDeclName(); 4832 return true; 4833 } 4834 4835 return false; 4836} 4837 4838/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4839/// linkage specification, including the language and (if present) 4840/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4841/// the location of the language string literal, which is provided 4842/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4843/// the '{' brace. Otherwise, this linkage specification does not 4844/// have any braces. 4845Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4846 SourceLocation ExternLoc, 4847 SourceLocation LangLoc, 4848 const char *Lang, 4849 unsigned StrSize, 4850 SourceLocation LBraceLoc) { 4851 LinkageSpecDecl::LanguageIDs Language; 4852 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4853 Language = LinkageSpecDecl::lang_c; 4854 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4855 Language = LinkageSpecDecl::lang_cxx; 4856 else { 4857 Diag(LangLoc, diag::err_bad_language); 4858 return DeclPtrTy(); 4859 } 4860 4861 // FIXME: Add all the various semantics of linkage specifications 4862 4863 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4864 LangLoc, Language, 4865 LBraceLoc.isValid()); 4866 CurContext->addDecl(D); 4867 PushDeclContext(S, D); 4868 return DeclPtrTy::make(D); 4869} 4870 4871/// ActOnFinishLinkageSpecification - Completely the definition of 4872/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4873/// valid, it's the position of the closing '}' brace in a linkage 4874/// specification that uses braces. 4875Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4876 DeclPtrTy LinkageSpec, 4877 SourceLocation RBraceLoc) { 4878 if (LinkageSpec) 4879 PopDeclContext(); 4880 return LinkageSpec; 4881} 4882 4883/// \brief Perform semantic analysis for the variable declaration that 4884/// occurs within a C++ catch clause, returning the newly-created 4885/// variable. 4886VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4887 TypeSourceInfo *TInfo, 4888 IdentifierInfo *Name, 4889 SourceLocation Loc, 4890 SourceRange Range) { 4891 bool Invalid = false; 4892 4893 // Arrays and functions decay. 4894 if (ExDeclType->isArrayType()) 4895 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4896 else if (ExDeclType->isFunctionType()) 4897 ExDeclType = Context.getPointerType(ExDeclType); 4898 4899 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4900 // The exception-declaration shall not denote a pointer or reference to an 4901 // incomplete type, other than [cv] void*. 4902 // N2844 forbids rvalue references. 4903 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4904 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4905 Invalid = true; 4906 } 4907 4908 // GCC allows catching pointers and references to incomplete types 4909 // as an extension; so do we, but we warn by default. 4910 4911 QualType BaseType = ExDeclType; 4912 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4913 unsigned DK = diag::err_catch_incomplete; 4914 bool IncompleteCatchIsInvalid = true; 4915 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4916 BaseType = Ptr->getPointeeType(); 4917 Mode = 1; 4918 DK = diag::ext_catch_incomplete_ptr; 4919 IncompleteCatchIsInvalid = false; 4920 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4921 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4922 BaseType = Ref->getPointeeType(); 4923 Mode = 2; 4924 DK = diag::ext_catch_incomplete_ref; 4925 IncompleteCatchIsInvalid = false; 4926 } 4927 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4928 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4929 IncompleteCatchIsInvalid) 4930 Invalid = true; 4931 4932 if (!Invalid && !ExDeclType->isDependentType() && 4933 RequireNonAbstractType(Loc, ExDeclType, 4934 diag::err_abstract_type_in_decl, 4935 AbstractVariableType)) 4936 Invalid = true; 4937 4938 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4939 Name, ExDeclType, TInfo, VarDecl::None, 4940 VarDecl::None); 4941 4942 if (!Invalid) { 4943 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4944 // C++ [except.handle]p16: 4945 // The object declared in an exception-declaration or, if the 4946 // exception-declaration does not specify a name, a temporary (12.2) is 4947 // copy-initialized (8.5) from the exception object. [...] 4948 // The object is destroyed when the handler exits, after the destruction 4949 // of any automatic objects initialized within the handler. 4950 // 4951 // We just pretend to initialize the object with itself, then make sure 4952 // it can be destroyed later. 4953 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4954 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4955 Loc, ExDeclType, 0); 4956 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4957 SourceLocation()); 4958 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4959 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4960 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4961 if (Result.isInvalid()) 4962 Invalid = true; 4963 else 4964 FinalizeVarWithDestructor(ExDecl, RecordTy); 4965 } 4966 } 4967 4968 if (Invalid) 4969 ExDecl->setInvalidDecl(); 4970 4971 return ExDecl; 4972} 4973 4974/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4975/// handler. 4976Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4977 TypeSourceInfo *TInfo = 0; 4978 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4979 4980 bool Invalid = D.isInvalidType(); 4981 IdentifierInfo *II = D.getIdentifier(); 4982 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4983 LookupOrdinaryName, 4984 ForRedeclaration)) { 4985 // The scope should be freshly made just for us. There is just no way 4986 // it contains any previous declaration. 4987 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4988 if (PrevDecl->isTemplateParameter()) { 4989 // Maybe we will complain about the shadowed template parameter. 4990 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4991 } 4992 } 4993 4994 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4995 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4996 << D.getCXXScopeSpec().getRange(); 4997 Invalid = true; 4998 } 4999 5000 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5001 D.getIdentifier(), 5002 D.getIdentifierLoc(), 5003 D.getDeclSpec().getSourceRange()); 5004 5005 if (Invalid) 5006 ExDecl->setInvalidDecl(); 5007 5008 // Add the exception declaration into this scope. 5009 if (II) 5010 PushOnScopeChains(ExDecl, S); 5011 else 5012 CurContext->addDecl(ExDecl); 5013 5014 ProcessDeclAttributes(S, ExDecl, D); 5015 return DeclPtrTy::make(ExDecl); 5016} 5017 5018Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5019 ExprArg assertexpr, 5020 ExprArg assertmessageexpr) { 5021 Expr *AssertExpr = (Expr *)assertexpr.get(); 5022 StringLiteral *AssertMessage = 5023 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5024 5025 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5026 llvm::APSInt Value(32); 5027 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5028 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5029 AssertExpr->getSourceRange(); 5030 return DeclPtrTy(); 5031 } 5032 5033 if (Value == 0) { 5034 Diag(AssertLoc, diag::err_static_assert_failed) 5035 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5036 } 5037 } 5038 5039 assertexpr.release(); 5040 assertmessageexpr.release(); 5041 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5042 AssertExpr, AssertMessage); 5043 5044 CurContext->addDecl(Decl); 5045 return DeclPtrTy::make(Decl); 5046} 5047 5048/// \brief Perform semantic analysis of the given friend type declaration. 5049/// 5050/// \returns A friend declaration that. 5051FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5052 TypeSourceInfo *TSInfo) { 5053 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5054 5055 QualType T = TSInfo->getType(); 5056 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5057 5058 if (!getLangOptions().CPlusPlus0x) { 5059 // C++03 [class.friend]p2: 5060 // An elaborated-type-specifier shall be used in a friend declaration 5061 // for a class.* 5062 // 5063 // * The class-key of the elaborated-type-specifier is required. 5064 if (!ActiveTemplateInstantiations.empty()) { 5065 // Do not complain about the form of friend template types during 5066 // template instantiation; we will already have complained when the 5067 // template was declared. 5068 } else if (!T->isElaboratedTypeSpecifier()) { 5069 // If we evaluated the type to a record type, suggest putting 5070 // a tag in front. 5071 if (const RecordType *RT = T->getAs<RecordType>()) { 5072 RecordDecl *RD = RT->getDecl(); 5073 5074 std::string InsertionText = std::string(" ") + RD->getKindName(); 5075 5076 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5077 << (unsigned) RD->getTagKind() 5078 << T 5079 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5080 InsertionText); 5081 } else { 5082 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5083 << T 5084 << SourceRange(FriendLoc, TypeRange.getEnd()); 5085 } 5086 } else if (T->getAs<EnumType>()) { 5087 Diag(FriendLoc, diag::ext_enum_friend) 5088 << T 5089 << SourceRange(FriendLoc, TypeRange.getEnd()); 5090 } 5091 } 5092 5093 // C++0x [class.friend]p3: 5094 // If the type specifier in a friend declaration designates a (possibly 5095 // cv-qualified) class type, that class is declared as a friend; otherwise, 5096 // the friend declaration is ignored. 5097 5098 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5099 // in [class.friend]p3 that we do not implement. 5100 5101 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5102} 5103 5104/// Handle a friend type declaration. This works in tandem with 5105/// ActOnTag. 5106/// 5107/// Notes on friend class templates: 5108/// 5109/// We generally treat friend class declarations as if they were 5110/// declaring a class. So, for example, the elaborated type specifier 5111/// in a friend declaration is required to obey the restrictions of a 5112/// class-head (i.e. no typedefs in the scope chain), template 5113/// parameters are required to match up with simple template-ids, &c. 5114/// However, unlike when declaring a template specialization, it's 5115/// okay to refer to a template specialization without an empty 5116/// template parameter declaration, e.g. 5117/// friend class A<T>::B<unsigned>; 5118/// We permit this as a special case; if there are any template 5119/// parameters present at all, require proper matching, i.e. 5120/// template <> template <class T> friend class A<int>::B; 5121Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5122 MultiTemplateParamsArg TempParams) { 5123 SourceLocation Loc = DS.getSourceRange().getBegin(); 5124 5125 assert(DS.isFriendSpecified()); 5126 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5127 5128 // Try to convert the decl specifier to a type. This works for 5129 // friend templates because ActOnTag never produces a ClassTemplateDecl 5130 // for a TUK_Friend. 5131 Declarator TheDeclarator(DS, Declarator::MemberContext); 5132 TypeSourceInfo *TSI; 5133 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5134 if (TheDeclarator.isInvalidType()) 5135 return DeclPtrTy(); 5136 5137 if (!TSI) 5138 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5139 5140 // This is definitely an error in C++98. It's probably meant to 5141 // be forbidden in C++0x, too, but the specification is just 5142 // poorly written. 5143 // 5144 // The problem is with declarations like the following: 5145 // template <T> friend A<T>::foo; 5146 // where deciding whether a class C is a friend or not now hinges 5147 // on whether there exists an instantiation of A that causes 5148 // 'foo' to equal C. There are restrictions on class-heads 5149 // (which we declare (by fiat) elaborated friend declarations to 5150 // be) that makes this tractable. 5151 // 5152 // FIXME: handle "template <> friend class A<T>;", which 5153 // is possibly well-formed? Who even knows? 5154 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5155 Diag(Loc, diag::err_tagless_friend_type_template) 5156 << DS.getSourceRange(); 5157 return DeclPtrTy(); 5158 } 5159 5160 // C++98 [class.friend]p1: A friend of a class is a function 5161 // or class that is not a member of the class . . . 5162 // This is fixed in DR77, which just barely didn't make the C++03 5163 // deadline. It's also a very silly restriction that seriously 5164 // affects inner classes and which nobody else seems to implement; 5165 // thus we never diagnose it, not even in -pedantic. 5166 // 5167 // But note that we could warn about it: it's always useless to 5168 // friend one of your own members (it's not, however, worthless to 5169 // friend a member of an arbitrary specialization of your template). 5170 5171 Decl *D; 5172 if (unsigned NumTempParamLists = TempParams.size()) 5173 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5174 NumTempParamLists, 5175 (TemplateParameterList**) TempParams.release(), 5176 TSI, 5177 DS.getFriendSpecLoc()); 5178 else 5179 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5180 5181 if (!D) 5182 return DeclPtrTy(); 5183 5184 D->setAccess(AS_public); 5185 CurContext->addDecl(D); 5186 5187 return DeclPtrTy::make(D); 5188} 5189 5190Sema::DeclPtrTy 5191Sema::ActOnFriendFunctionDecl(Scope *S, 5192 Declarator &D, 5193 bool IsDefinition, 5194 MultiTemplateParamsArg TemplateParams) { 5195 const DeclSpec &DS = D.getDeclSpec(); 5196 5197 assert(DS.isFriendSpecified()); 5198 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5199 5200 SourceLocation Loc = D.getIdentifierLoc(); 5201 TypeSourceInfo *TInfo = 0; 5202 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5203 5204 // C++ [class.friend]p1 5205 // A friend of a class is a function or class.... 5206 // Note that this sees through typedefs, which is intended. 5207 // It *doesn't* see through dependent types, which is correct 5208 // according to [temp.arg.type]p3: 5209 // If a declaration acquires a function type through a 5210 // type dependent on a template-parameter and this causes 5211 // a declaration that does not use the syntactic form of a 5212 // function declarator to have a function type, the program 5213 // is ill-formed. 5214 if (!T->isFunctionType()) { 5215 Diag(Loc, diag::err_unexpected_friend); 5216 5217 // It might be worthwhile to try to recover by creating an 5218 // appropriate declaration. 5219 return DeclPtrTy(); 5220 } 5221 5222 // C++ [namespace.memdef]p3 5223 // - If a friend declaration in a non-local class first declares a 5224 // class or function, the friend class or function is a member 5225 // of the innermost enclosing namespace. 5226 // - The name of the friend is not found by simple name lookup 5227 // until a matching declaration is provided in that namespace 5228 // scope (either before or after the class declaration granting 5229 // friendship). 5230 // - If a friend function is called, its name may be found by the 5231 // name lookup that considers functions from namespaces and 5232 // classes associated with the types of the function arguments. 5233 // - When looking for a prior declaration of a class or a function 5234 // declared as a friend, scopes outside the innermost enclosing 5235 // namespace scope are not considered. 5236 5237 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5238 DeclarationName Name = GetNameForDeclarator(D); 5239 assert(Name); 5240 5241 // The context we found the declaration in, or in which we should 5242 // create the declaration. 5243 DeclContext *DC; 5244 5245 // FIXME: handle local classes 5246 5247 // Recover from invalid scope qualifiers as if they just weren't there. 5248 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5249 ForRedeclaration); 5250 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5251 // FIXME: RequireCompleteDeclContext 5252 DC = computeDeclContext(ScopeQual); 5253 5254 // FIXME: handle dependent contexts 5255 if (!DC) return DeclPtrTy(); 5256 5257 LookupQualifiedName(Previous, DC); 5258 5259 // If searching in that context implicitly found a declaration in 5260 // a different context, treat it like it wasn't found at all. 5261 // TODO: better diagnostics for this case. Suggesting the right 5262 // qualified scope would be nice... 5263 // FIXME: getRepresentativeDecl() is not right here at all 5264 if (Previous.empty() || 5265 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5266 D.setInvalidType(); 5267 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5268 return DeclPtrTy(); 5269 } 5270 5271 // C++ [class.friend]p1: A friend of a class is a function or 5272 // class that is not a member of the class . . . 5273 if (DC->Equals(CurContext)) 5274 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5275 5276 // Otherwise walk out to the nearest namespace scope looking for matches. 5277 } else { 5278 // TODO: handle local class contexts. 5279 5280 DC = CurContext; 5281 while (true) { 5282 // Skip class contexts. If someone can cite chapter and verse 5283 // for this behavior, that would be nice --- it's what GCC and 5284 // EDG do, and it seems like a reasonable intent, but the spec 5285 // really only says that checks for unqualified existing 5286 // declarations should stop at the nearest enclosing namespace, 5287 // not that they should only consider the nearest enclosing 5288 // namespace. 5289 while (DC->isRecord()) 5290 DC = DC->getParent(); 5291 5292 LookupQualifiedName(Previous, DC); 5293 5294 // TODO: decide what we think about using declarations. 5295 if (!Previous.empty()) 5296 break; 5297 5298 if (DC->isFileContext()) break; 5299 DC = DC->getParent(); 5300 } 5301 5302 // C++ [class.friend]p1: A friend of a class is a function or 5303 // class that is not a member of the class . . . 5304 // C++0x changes this for both friend types and functions. 5305 // Most C++ 98 compilers do seem to give an error here, so 5306 // we do, too. 5307 if (!Previous.empty() && DC->Equals(CurContext) 5308 && !getLangOptions().CPlusPlus0x) 5309 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5310 } 5311 5312 if (DC->isFileContext()) { 5313 // This implies that it has to be an operator or function. 5314 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5315 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5316 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5317 Diag(Loc, diag::err_introducing_special_friend) << 5318 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5319 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5320 return DeclPtrTy(); 5321 } 5322 } 5323 5324 bool Redeclaration = false; 5325 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5326 move(TemplateParams), 5327 IsDefinition, 5328 Redeclaration); 5329 if (!ND) return DeclPtrTy(); 5330 5331 assert(ND->getDeclContext() == DC); 5332 assert(ND->getLexicalDeclContext() == CurContext); 5333 5334 // Add the function declaration to the appropriate lookup tables, 5335 // adjusting the redeclarations list as necessary. We don't 5336 // want to do this yet if the friending class is dependent. 5337 // 5338 // Also update the scope-based lookup if the target context's 5339 // lookup context is in lexical scope. 5340 if (!CurContext->isDependentContext()) { 5341 DC = DC->getLookupContext(); 5342 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5343 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5344 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5345 } 5346 5347 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5348 D.getIdentifierLoc(), ND, 5349 DS.getFriendSpecLoc()); 5350 FrD->setAccess(AS_public); 5351 CurContext->addDecl(FrD); 5352 5353 return DeclPtrTy::make(ND); 5354} 5355 5356void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5357 AdjustDeclIfTemplate(dcl); 5358 5359 Decl *Dcl = dcl.getAs<Decl>(); 5360 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5361 if (!Fn) { 5362 Diag(DelLoc, diag::err_deleted_non_function); 5363 return; 5364 } 5365 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5366 Diag(DelLoc, diag::err_deleted_decl_not_first); 5367 Diag(Prev->getLocation(), diag::note_previous_declaration); 5368 // If the declaration wasn't the first, we delete the function anyway for 5369 // recovery. 5370 } 5371 Fn->setDeleted(); 5372} 5373 5374static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5375 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5376 ++CI) { 5377 Stmt *SubStmt = *CI; 5378 if (!SubStmt) 5379 continue; 5380 if (isa<ReturnStmt>(SubStmt)) 5381 Self.Diag(SubStmt->getSourceRange().getBegin(), 5382 diag::err_return_in_constructor_handler); 5383 if (!isa<Expr>(SubStmt)) 5384 SearchForReturnInStmt(Self, SubStmt); 5385 } 5386} 5387 5388void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5389 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5390 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5391 SearchForReturnInStmt(*this, Handler); 5392 } 5393} 5394 5395bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5396 const CXXMethodDecl *Old) { 5397 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5398 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5399 5400 if (Context.hasSameType(NewTy, OldTy) || 5401 NewTy->isDependentType() || OldTy->isDependentType()) 5402 return false; 5403 5404 // Check if the return types are covariant 5405 QualType NewClassTy, OldClassTy; 5406 5407 /// Both types must be pointers or references to classes. 5408 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5409 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5410 NewClassTy = NewPT->getPointeeType(); 5411 OldClassTy = OldPT->getPointeeType(); 5412 } 5413 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5414 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5415 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5416 NewClassTy = NewRT->getPointeeType(); 5417 OldClassTy = OldRT->getPointeeType(); 5418 } 5419 } 5420 } 5421 5422 // The return types aren't either both pointers or references to a class type. 5423 if (NewClassTy.isNull()) { 5424 Diag(New->getLocation(), 5425 diag::err_different_return_type_for_overriding_virtual_function) 5426 << New->getDeclName() << NewTy << OldTy; 5427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5428 5429 return true; 5430 } 5431 5432 // C++ [class.virtual]p6: 5433 // If the return type of D::f differs from the return type of B::f, the 5434 // class type in the return type of D::f shall be complete at the point of 5435 // declaration of D::f or shall be the class type D. 5436 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5437 if (!RT->isBeingDefined() && 5438 RequireCompleteType(New->getLocation(), NewClassTy, 5439 PDiag(diag::err_covariant_return_incomplete) 5440 << New->getDeclName())) 5441 return true; 5442 } 5443 5444 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5445 // Check if the new class derives from the old class. 5446 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5447 Diag(New->getLocation(), 5448 diag::err_covariant_return_not_derived) 5449 << New->getDeclName() << NewTy << OldTy; 5450 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5451 return true; 5452 } 5453 5454 // Check if we the conversion from derived to base is valid. 5455 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5456 diag::err_covariant_return_inaccessible_base, 5457 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5458 // FIXME: Should this point to the return type? 5459 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5460 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5461 return true; 5462 } 5463 } 5464 5465 // The qualifiers of the return types must be the same. 5466 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5467 Diag(New->getLocation(), 5468 diag::err_covariant_return_type_different_qualifications) 5469 << New->getDeclName() << NewTy << OldTy; 5470 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5471 return true; 5472 }; 5473 5474 5475 // The new class type must have the same or less qualifiers as the old type. 5476 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5477 Diag(New->getLocation(), 5478 diag::err_covariant_return_type_class_type_more_qualified) 5479 << New->getDeclName() << NewTy << OldTy; 5480 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5481 return true; 5482 }; 5483 5484 return false; 5485} 5486 5487bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5488 const CXXMethodDecl *Old) 5489{ 5490 if (Old->hasAttr<FinalAttr>()) { 5491 Diag(New->getLocation(), diag::err_final_function_overridden) 5492 << New->getDeclName(); 5493 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5494 return true; 5495 } 5496 5497 return false; 5498} 5499 5500/// \brief Mark the given method pure. 5501/// 5502/// \param Method the method to be marked pure. 5503/// 5504/// \param InitRange the source range that covers the "0" initializer. 5505bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5506 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5507 Method->setPure(); 5508 5509 // A class is abstract if at least one function is pure virtual. 5510 Method->getParent()->setAbstract(true); 5511 return false; 5512 } 5513 5514 if (!Method->isInvalidDecl()) 5515 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5516 << Method->getDeclName() << InitRange; 5517 return true; 5518} 5519 5520/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5521/// an initializer for the out-of-line declaration 'Dcl'. The scope 5522/// is a fresh scope pushed for just this purpose. 5523/// 5524/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5525/// static data member of class X, names should be looked up in the scope of 5526/// class X. 5527void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5528 // If there is no declaration, there was an error parsing it. 5529 Decl *D = Dcl.getAs<Decl>(); 5530 if (D == 0) return; 5531 5532 // We should only get called for declarations with scope specifiers, like: 5533 // int foo::bar; 5534 assert(D->isOutOfLine()); 5535 EnterDeclaratorContext(S, D->getDeclContext()); 5536} 5537 5538/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5539/// initializer for the out-of-line declaration 'Dcl'. 5540void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5541 // If there is no declaration, there was an error parsing it. 5542 Decl *D = Dcl.getAs<Decl>(); 5543 if (D == 0) return; 5544 5545 assert(D->isOutOfLine()); 5546 ExitDeclaratorContext(S); 5547} 5548 5549/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5550/// C++ if/switch/while/for statement. 5551/// e.g: "if (int x = f()) {...}" 5552Action::DeclResult 5553Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5554 // C++ 6.4p2: 5555 // The declarator shall not specify a function or an array. 5556 // The type-specifier-seq shall not contain typedef and shall not declare a 5557 // new class or enumeration. 5558 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5559 "Parser allowed 'typedef' as storage class of condition decl."); 5560 5561 TypeSourceInfo *TInfo = 0; 5562 TagDecl *OwnedTag = 0; 5563 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5564 5565 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5566 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5567 // would be created and CXXConditionDeclExpr wants a VarDecl. 5568 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5569 << D.getSourceRange(); 5570 return DeclResult(); 5571 } else if (OwnedTag && OwnedTag->isDefinition()) { 5572 // The type-specifier-seq shall not declare a new class or enumeration. 5573 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5574 } 5575 5576 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5577 if (!Dcl) 5578 return DeclResult(); 5579 5580 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5581 VD->setDeclaredInCondition(true); 5582 return Dcl; 5583} 5584 5585static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5586 // Ignore dependent types. 5587 if (MD->isDependentContext()) 5588 return false; 5589 5590 // Ignore declarations that are not definitions. 5591 if (!MD->isThisDeclarationADefinition()) 5592 return false; 5593 5594 CXXRecordDecl *RD = MD->getParent(); 5595 5596 // Ignore classes without a vtable. 5597 if (!RD->isDynamicClass()) 5598 return false; 5599 5600 switch (MD->getParent()->getTemplateSpecializationKind()) { 5601 case TSK_Undeclared: 5602 case TSK_ExplicitSpecialization: 5603 // Classes that aren't instantiations of templates don't need their 5604 // virtual methods marked until we see the definition of the key 5605 // function. 5606 break; 5607 5608 case TSK_ImplicitInstantiation: 5609 // This is a constructor of a class template; mark all of the virtual 5610 // members as referenced to ensure that they get instantiatied. 5611 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5612 return true; 5613 break; 5614 5615 case TSK_ExplicitInstantiationDeclaration: 5616 return false; 5617 5618 case TSK_ExplicitInstantiationDefinition: 5619 // This is method of a explicit instantiation; mark all of the virtual 5620 // members as referenced to ensure that they get instantiatied. 5621 return true; 5622 } 5623 5624 // Consider only out-of-line definitions of member functions. When we see 5625 // an inline definition, it's too early to compute the key function. 5626 if (!MD->isOutOfLine()) 5627 return false; 5628 5629 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5630 5631 // If there is no key function, we will need a copy of the vtable. 5632 if (!KeyFunction) 5633 return true; 5634 5635 // If this is the key function, we need to mark virtual members. 5636 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5637 return true; 5638 5639 return false; 5640} 5641 5642void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5643 CXXMethodDecl *MD) { 5644 CXXRecordDecl *RD = MD->getParent(); 5645 5646 // We will need to mark all of the virtual members as referenced to build the 5647 // vtable. 5648 if (!needsVTable(MD, Context)) 5649 return; 5650 5651 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5652 if (kind == TSK_ImplicitInstantiation) 5653 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5654 else 5655 MarkVirtualMembersReferenced(Loc, RD); 5656} 5657 5658bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5659 if (ClassesWithUnmarkedVirtualMembers.empty()) 5660 return false; 5661 5662 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5663 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5664 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5665 ClassesWithUnmarkedVirtualMembers.pop_back(); 5666 MarkVirtualMembersReferenced(Loc, RD); 5667 } 5668 5669 return true; 5670} 5671 5672void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5673 const CXXRecordDecl *RD) { 5674 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5675 e = RD->method_end(); i != e; ++i) { 5676 CXXMethodDecl *MD = *i; 5677 5678 // C++ [basic.def.odr]p2: 5679 // [...] A virtual member function is used if it is not pure. [...] 5680 if (MD->isVirtual() && !MD->isPure()) 5681 MarkDeclarationReferenced(Loc, MD); 5682 } 5683 5684 // Only classes that have virtual bases need a VTT. 5685 if (RD->getNumVBases() == 0) 5686 return; 5687 5688 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5689 e = RD->bases_end(); i != e; ++i) { 5690 const CXXRecordDecl *Base = 5691 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5692 if (i->isVirtual()) 5693 continue; 5694 if (Base->getNumVBases() == 0) 5695 continue; 5696 MarkVirtualMembersReferenced(Loc, Base); 5697 } 5698} 5699