SemaDeclCXX.cpp revision 59b7f1538d9d4c4f7c3932e3e3f95d2cb0fca7e4
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 714 CXXBaseSpecifierArray &BasePathArray) { 715 assert(BasePathArray.empty() && "Base path array must be empty!"); 716 assert(Paths.isRecordingPaths() && "Must record paths!"); 717 718 const CXXBasePath &Path = Paths.front(); 719 720 // We first go backward and check if we have a virtual base. 721 // FIXME: It would be better if CXXBasePath had the base specifier for 722 // the nearest virtual base. 723 unsigned Start = 0; 724 for (unsigned I = Path.size(); I != 0; --I) { 725 if (Path[I - 1].Base->isVirtual()) { 726 Start = I - 1; 727 break; 728 } 729 } 730 731 // Now add all bases. 732 for (unsigned I = Start, E = Path.size(); I != E; ++I) 733 BasePathArray.push_back(Path[I].Base); 734} 735 736/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 737/// conversion (where Derived and Base are class types) is 738/// well-formed, meaning that the conversion is unambiguous (and 739/// that all of the base classes are accessible). Returns true 740/// and emits a diagnostic if the code is ill-formed, returns false 741/// otherwise. Loc is the location where this routine should point to 742/// if there is an error, and Range is the source range to highlight 743/// if there is an error. 744bool 745Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 746 unsigned InaccessibleBaseID, 747 unsigned AmbigiousBaseConvID, 748 SourceLocation Loc, SourceRange Range, 749 DeclarationName Name, 750 CXXBaseSpecifierArray *BasePath) { 751 // First, determine whether the path from Derived to Base is 752 // ambiguous. This is slightly more expensive than checking whether 753 // the Derived to Base conversion exists, because here we need to 754 // explore multiple paths to determine if there is an ambiguity. 755 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 756 /*DetectVirtual=*/false); 757 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 758 assert(DerivationOkay && 759 "Can only be used with a derived-to-base conversion"); 760 (void)DerivationOkay; 761 762 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 763 if (InaccessibleBaseID) { 764 // Check that the base class can be accessed. 765 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 766 InaccessibleBaseID)) { 767 case AR_inaccessible: 768 return true; 769 case AR_accessible: 770 case AR_dependent: 771 case AR_delayed: 772 break; 773 } 774 } 775 776 // Build a base path if necessary. 777 if (BasePath) 778 BuildBasePathArray(Paths, *BasePath); 779 return false; 780 } 781 782 // We know that the derived-to-base conversion is ambiguous, and 783 // we're going to produce a diagnostic. Perform the derived-to-base 784 // search just one more time to compute all of the possible paths so 785 // that we can print them out. This is more expensive than any of 786 // the previous derived-to-base checks we've done, but at this point 787 // performance isn't as much of an issue. 788 Paths.clear(); 789 Paths.setRecordingPaths(true); 790 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 791 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 792 (void)StillOkay; 793 794 // Build up a textual representation of the ambiguous paths, e.g., 795 // D -> B -> A, that will be used to illustrate the ambiguous 796 // conversions in the diagnostic. We only print one of the paths 797 // to each base class subobject. 798 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 799 800 Diag(Loc, AmbigiousBaseConvID) 801 << Derived << Base << PathDisplayStr << Range << Name; 802 return true; 803} 804 805bool 806Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 807 SourceLocation Loc, SourceRange Range, 808 CXXBaseSpecifierArray *BasePath, 809 bool IgnoreAccess) { 810 return CheckDerivedToBaseConversion(Derived, Base, 811 IgnoreAccess ? 0 812 : diag::err_upcast_to_inaccessible_base, 813 diag::err_ambiguous_derived_to_base_conv, 814 Loc, Range, DeclarationName(), 815 BasePath); 816} 817 818 819/// @brief Builds a string representing ambiguous paths from a 820/// specific derived class to different subobjects of the same base 821/// class. 822/// 823/// This function builds a string that can be used in error messages 824/// to show the different paths that one can take through the 825/// inheritance hierarchy to go from the derived class to different 826/// subobjects of a base class. The result looks something like this: 827/// @code 828/// struct D -> struct B -> struct A 829/// struct D -> struct C -> struct A 830/// @endcode 831std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 832 std::string PathDisplayStr; 833 std::set<unsigned> DisplayedPaths; 834 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 835 Path != Paths.end(); ++Path) { 836 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 837 // We haven't displayed a path to this particular base 838 // class subobject yet. 839 PathDisplayStr += "\n "; 840 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 841 for (CXXBasePath::const_iterator Element = Path->begin(); 842 Element != Path->end(); ++Element) 843 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 844 } 845 } 846 847 return PathDisplayStr; 848} 849 850//===----------------------------------------------------------------------===// 851// C++ class member Handling 852//===----------------------------------------------------------------------===// 853 854/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 855/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 856/// bitfield width if there is one and 'InitExpr' specifies the initializer if 857/// any. 858Sema::DeclPtrTy 859Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 860 MultiTemplateParamsArg TemplateParameterLists, 861 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 862 bool Deleted) { 863 const DeclSpec &DS = D.getDeclSpec(); 864 DeclarationName Name = GetNameForDeclarator(D); 865 Expr *BitWidth = static_cast<Expr*>(BW); 866 Expr *Init = static_cast<Expr*>(InitExpr); 867 SourceLocation Loc = D.getIdentifierLoc(); 868 869 bool isFunc = D.isFunctionDeclarator(); 870 871 assert(!DS.isFriendSpecified()); 872 873 // C++ 9.2p6: A member shall not be declared to have automatic storage 874 // duration (auto, register) or with the extern storage-class-specifier. 875 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 876 // data members and cannot be applied to names declared const or static, 877 // and cannot be applied to reference members. 878 switch (DS.getStorageClassSpec()) { 879 case DeclSpec::SCS_unspecified: 880 case DeclSpec::SCS_typedef: 881 case DeclSpec::SCS_static: 882 // FALL THROUGH. 883 break; 884 case DeclSpec::SCS_mutable: 885 if (isFunc) { 886 if (DS.getStorageClassSpecLoc().isValid()) 887 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 888 else 889 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 890 891 // FIXME: It would be nicer if the keyword was ignored only for this 892 // declarator. Otherwise we could get follow-up errors. 893 D.getMutableDeclSpec().ClearStorageClassSpecs(); 894 } else { 895 QualType T = GetTypeForDeclarator(D, S); 896 diag::kind err = static_cast<diag::kind>(0); 897 if (T->isReferenceType()) 898 err = diag::err_mutable_reference; 899 else if (T.isConstQualified()) 900 err = diag::err_mutable_const; 901 if (err != 0) { 902 if (DS.getStorageClassSpecLoc().isValid()) 903 Diag(DS.getStorageClassSpecLoc(), err); 904 else 905 Diag(DS.getThreadSpecLoc(), err); 906 // FIXME: It would be nicer if the keyword was ignored only for this 907 // declarator. Otherwise we could get follow-up errors. 908 D.getMutableDeclSpec().ClearStorageClassSpecs(); 909 } 910 } 911 break; 912 default: 913 if (DS.getStorageClassSpecLoc().isValid()) 914 Diag(DS.getStorageClassSpecLoc(), 915 diag::err_storageclass_invalid_for_member); 916 else 917 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 918 D.getMutableDeclSpec().ClearStorageClassSpecs(); 919 } 920 921 if (!isFunc && 922 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 923 D.getNumTypeObjects() == 0) { 924 // Check also for this case: 925 // 926 // typedef int f(); 927 // f a; 928 // 929 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 930 isFunc = TDType->isFunctionType(); 931 } 932 933 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 934 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 935 !isFunc); 936 937 Decl *Member; 938 if (isInstField) { 939 // FIXME: Check for template parameters! 940 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 941 AS); 942 assert(Member && "HandleField never returns null"); 943 } else { 944 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 945 .getAs<Decl>(); 946 if (!Member) { 947 if (BitWidth) DeleteExpr(BitWidth); 948 return DeclPtrTy(); 949 } 950 951 // Non-instance-fields can't have a bitfield. 952 if (BitWidth) { 953 if (Member->isInvalidDecl()) { 954 // don't emit another diagnostic. 955 } else if (isa<VarDecl>(Member)) { 956 // C++ 9.6p3: A bit-field shall not be a static member. 957 // "static member 'A' cannot be a bit-field" 958 Diag(Loc, diag::err_static_not_bitfield) 959 << Name << BitWidth->getSourceRange(); 960 } else if (isa<TypedefDecl>(Member)) { 961 // "typedef member 'x' cannot be a bit-field" 962 Diag(Loc, diag::err_typedef_not_bitfield) 963 << Name << BitWidth->getSourceRange(); 964 } else { 965 // A function typedef ("typedef int f(); f a;"). 966 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 967 Diag(Loc, diag::err_not_integral_type_bitfield) 968 << Name << cast<ValueDecl>(Member)->getType() 969 << BitWidth->getSourceRange(); 970 } 971 972 DeleteExpr(BitWidth); 973 BitWidth = 0; 974 Member->setInvalidDecl(); 975 } 976 977 Member->setAccess(AS); 978 979 // If we have declared a member function template, set the access of the 980 // templated declaration as well. 981 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 982 FunTmpl->getTemplatedDecl()->setAccess(AS); 983 } 984 985 assert((Name || isInstField) && "No identifier for non-field ?"); 986 987 if (Init) 988 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 989 if (Deleted) // FIXME: Source location is not very good. 990 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 991 992 if (isInstField) { 993 FieldCollector->Add(cast<FieldDecl>(Member)); 994 return DeclPtrTy(); 995 } 996 return DeclPtrTy::make(Member); 997} 998 999/// \brief Find the direct and/or virtual base specifiers that 1000/// correspond to the given base type, for use in base initialization 1001/// within a constructor. 1002static bool FindBaseInitializer(Sema &SemaRef, 1003 CXXRecordDecl *ClassDecl, 1004 QualType BaseType, 1005 const CXXBaseSpecifier *&DirectBaseSpec, 1006 const CXXBaseSpecifier *&VirtualBaseSpec) { 1007 // First, check for a direct base class. 1008 DirectBaseSpec = 0; 1009 for (CXXRecordDecl::base_class_const_iterator Base 1010 = ClassDecl->bases_begin(); 1011 Base != ClassDecl->bases_end(); ++Base) { 1012 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1013 // We found a direct base of this type. That's what we're 1014 // initializing. 1015 DirectBaseSpec = &*Base; 1016 break; 1017 } 1018 } 1019 1020 // Check for a virtual base class. 1021 // FIXME: We might be able to short-circuit this if we know in advance that 1022 // there are no virtual bases. 1023 VirtualBaseSpec = 0; 1024 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1025 // We haven't found a base yet; search the class hierarchy for a 1026 // virtual base class. 1027 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1028 /*DetectVirtual=*/false); 1029 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1030 BaseType, Paths)) { 1031 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1032 Path != Paths.end(); ++Path) { 1033 if (Path->back().Base->isVirtual()) { 1034 VirtualBaseSpec = Path->back().Base; 1035 break; 1036 } 1037 } 1038 } 1039 } 1040 1041 return DirectBaseSpec || VirtualBaseSpec; 1042} 1043 1044/// ActOnMemInitializer - Handle a C++ member initializer. 1045Sema::MemInitResult 1046Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1047 Scope *S, 1048 CXXScopeSpec &SS, 1049 IdentifierInfo *MemberOrBase, 1050 TypeTy *TemplateTypeTy, 1051 SourceLocation IdLoc, 1052 SourceLocation LParenLoc, 1053 ExprTy **Args, unsigned NumArgs, 1054 SourceLocation *CommaLocs, 1055 SourceLocation RParenLoc) { 1056 if (!ConstructorD) 1057 return true; 1058 1059 AdjustDeclIfTemplate(ConstructorD); 1060 1061 CXXConstructorDecl *Constructor 1062 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1063 if (!Constructor) { 1064 // The user wrote a constructor initializer on a function that is 1065 // not a C++ constructor. Ignore the error for now, because we may 1066 // have more member initializers coming; we'll diagnose it just 1067 // once in ActOnMemInitializers. 1068 return true; 1069 } 1070 1071 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1072 1073 // C++ [class.base.init]p2: 1074 // Names in a mem-initializer-id are looked up in the scope of the 1075 // constructor’s class and, if not found in that scope, are looked 1076 // up in the scope containing the constructor’s 1077 // definition. [Note: if the constructor’s class contains a member 1078 // with the same name as a direct or virtual base class of the 1079 // class, a mem-initializer-id naming the member or base class and 1080 // composed of a single identifier refers to the class member. A 1081 // mem-initializer-id for the hidden base class may be specified 1082 // using a qualified name. ] 1083 if (!SS.getScopeRep() && !TemplateTypeTy) { 1084 // Look for a member, first. 1085 FieldDecl *Member = 0; 1086 DeclContext::lookup_result Result 1087 = ClassDecl->lookup(MemberOrBase); 1088 if (Result.first != Result.second) 1089 Member = dyn_cast<FieldDecl>(*Result.first); 1090 1091 // FIXME: Handle members of an anonymous union. 1092 1093 if (Member) 1094 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1095 LParenLoc, RParenLoc); 1096 } 1097 // It didn't name a member, so see if it names a class. 1098 QualType BaseType; 1099 TypeSourceInfo *TInfo = 0; 1100 1101 if (TemplateTypeTy) { 1102 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1103 } else { 1104 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1105 LookupParsedName(R, S, &SS); 1106 1107 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1108 if (!TyD) { 1109 if (R.isAmbiguous()) return true; 1110 1111 // We don't want access-control diagnostics here. 1112 R.suppressDiagnostics(); 1113 1114 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1115 bool NotUnknownSpecialization = false; 1116 DeclContext *DC = computeDeclContext(SS, false); 1117 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1118 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1119 1120 if (!NotUnknownSpecialization) { 1121 // When the scope specifier can refer to a member of an unknown 1122 // specialization, we take it as a type name. 1123 BaseType = CheckTypenameType(ETK_None, 1124 (NestedNameSpecifier *)SS.getScopeRep(), 1125 *MemberOrBase, SS.getRange()); 1126 if (BaseType.isNull()) 1127 return true; 1128 1129 R.clear(); 1130 } 1131 } 1132 1133 // If no results were found, try to correct typos. 1134 if (R.empty() && BaseType.isNull() && 1135 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1136 R.isSingleResult()) { 1137 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1138 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1139 // We have found a non-static data member with a similar 1140 // name to what was typed; complain and initialize that 1141 // member. 1142 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1143 << MemberOrBase << true << R.getLookupName() 1144 << FixItHint::CreateReplacement(R.getNameLoc(), 1145 R.getLookupName().getAsString()); 1146 Diag(Member->getLocation(), diag::note_previous_decl) 1147 << Member->getDeclName(); 1148 1149 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1150 LParenLoc, RParenLoc); 1151 } 1152 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1153 const CXXBaseSpecifier *DirectBaseSpec; 1154 const CXXBaseSpecifier *VirtualBaseSpec; 1155 if (FindBaseInitializer(*this, ClassDecl, 1156 Context.getTypeDeclType(Type), 1157 DirectBaseSpec, VirtualBaseSpec)) { 1158 // We have found a direct or virtual base class with a 1159 // similar name to what was typed; complain and initialize 1160 // that base class. 1161 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1162 << MemberOrBase << false << R.getLookupName() 1163 << FixItHint::CreateReplacement(R.getNameLoc(), 1164 R.getLookupName().getAsString()); 1165 1166 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1167 : VirtualBaseSpec; 1168 Diag(BaseSpec->getSourceRange().getBegin(), 1169 diag::note_base_class_specified_here) 1170 << BaseSpec->getType() 1171 << BaseSpec->getSourceRange(); 1172 1173 TyD = Type; 1174 } 1175 } 1176 } 1177 1178 if (!TyD && BaseType.isNull()) { 1179 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1180 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1181 return true; 1182 } 1183 } 1184 1185 if (BaseType.isNull()) { 1186 BaseType = Context.getTypeDeclType(TyD); 1187 if (SS.isSet()) { 1188 NestedNameSpecifier *Qualifier = 1189 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1190 1191 // FIXME: preserve source range information 1192 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1193 } 1194 } 1195 } 1196 1197 if (!TInfo) 1198 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1199 1200 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1201 LParenLoc, RParenLoc, ClassDecl); 1202} 1203 1204/// Checks an initializer expression for use of uninitialized fields, such as 1205/// containing the field that is being initialized. Returns true if there is an 1206/// uninitialized field was used an updates the SourceLocation parameter; false 1207/// otherwise. 1208static bool InitExprContainsUninitializedFields(const Stmt* S, 1209 const FieldDecl* LhsField, 1210 SourceLocation* L) { 1211 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1212 if (ME) { 1213 const NamedDecl* RhsField = ME->getMemberDecl(); 1214 if (RhsField == LhsField) { 1215 // Initializing a field with itself. Throw a warning. 1216 // But wait; there are exceptions! 1217 // Exception #1: The field may not belong to this record. 1218 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1219 const Expr* base = ME->getBase(); 1220 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1221 // Even though the field matches, it does not belong to this record. 1222 return false; 1223 } 1224 // None of the exceptions triggered; return true to indicate an 1225 // uninitialized field was used. 1226 *L = ME->getMemberLoc(); 1227 return true; 1228 } 1229 } 1230 bool found = false; 1231 for (Stmt::const_child_iterator it = S->child_begin(); 1232 it != S->child_end() && found == false; 1233 ++it) { 1234 if (isa<CallExpr>(S)) { 1235 // Do not descend into function calls or constructors, as the use 1236 // of an uninitialized field may be valid. One would have to inspect 1237 // the contents of the function/ctor to determine if it is safe or not. 1238 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1239 // may be safe, depending on what the function/ctor does. 1240 continue; 1241 } 1242 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1243 } 1244 return found; 1245} 1246 1247Sema::MemInitResult 1248Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1249 unsigned NumArgs, SourceLocation IdLoc, 1250 SourceLocation LParenLoc, 1251 SourceLocation RParenLoc) { 1252 // Diagnose value-uses of fields to initialize themselves, e.g. 1253 // foo(foo) 1254 // where foo is not also a parameter to the constructor. 1255 // TODO: implement -Wuninitialized and fold this into that framework. 1256 for (unsigned i = 0; i < NumArgs; ++i) { 1257 SourceLocation L; 1258 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1259 // FIXME: Return true in the case when other fields are used before being 1260 // uninitialized. For example, let this field be the i'th field. When 1261 // initializing the i'th field, throw a warning if any of the >= i'th 1262 // fields are used, as they are not yet initialized. 1263 // Right now we are only handling the case where the i'th field uses 1264 // itself in its initializer. 1265 Diag(L, diag::warn_field_is_uninit); 1266 } 1267 } 1268 1269 bool HasDependentArg = false; 1270 for (unsigned i = 0; i < NumArgs; i++) 1271 HasDependentArg |= Args[i]->isTypeDependent(); 1272 1273 QualType FieldType = Member->getType(); 1274 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1275 FieldType = Array->getElementType(); 1276 if (FieldType->isDependentType() || HasDependentArg) { 1277 // Can't check initialization for a member of dependent type or when 1278 // any of the arguments are type-dependent expressions. 1279 OwningExprResult Init 1280 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1281 RParenLoc)); 1282 1283 // Erase any temporaries within this evaluation context; we're not 1284 // going to track them in the AST, since we'll be rebuilding the 1285 // ASTs during template instantiation. 1286 ExprTemporaries.erase( 1287 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1288 ExprTemporaries.end()); 1289 1290 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1291 LParenLoc, 1292 Init.takeAs<Expr>(), 1293 RParenLoc); 1294 1295 } 1296 1297 if (Member->isInvalidDecl()) 1298 return true; 1299 1300 // Initialize the member. 1301 InitializedEntity MemberEntity = 1302 InitializedEntity::InitializeMember(Member, 0); 1303 InitializationKind Kind = 1304 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1305 1306 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1307 1308 OwningExprResult MemberInit = 1309 InitSeq.Perform(*this, MemberEntity, Kind, 1310 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1311 if (MemberInit.isInvalid()) 1312 return true; 1313 1314 // C++0x [class.base.init]p7: 1315 // The initialization of each base and member constitutes a 1316 // full-expression. 1317 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1318 if (MemberInit.isInvalid()) 1319 return true; 1320 1321 // If we are in a dependent context, template instantiation will 1322 // perform this type-checking again. Just save the arguments that we 1323 // received in a ParenListExpr. 1324 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1325 // of the information that we have about the member 1326 // initializer. However, deconstructing the ASTs is a dicey process, 1327 // and this approach is far more likely to get the corner cases right. 1328 if (CurContext->isDependentContext()) { 1329 // Bump the reference count of all of the arguments. 1330 for (unsigned I = 0; I != NumArgs; ++I) 1331 Args[I]->Retain(); 1332 1333 OwningExprResult Init 1334 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1335 RParenLoc)); 1336 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1337 LParenLoc, 1338 Init.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1343 LParenLoc, 1344 MemberInit.takeAs<Expr>(), 1345 RParenLoc); 1346} 1347 1348Sema::MemInitResult 1349Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1350 Expr **Args, unsigned NumArgs, 1351 SourceLocation LParenLoc, SourceLocation RParenLoc, 1352 CXXRecordDecl *ClassDecl) { 1353 bool HasDependentArg = false; 1354 for (unsigned i = 0; i < NumArgs; i++) 1355 HasDependentArg |= Args[i]->isTypeDependent(); 1356 1357 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1358 if (BaseType->isDependentType() || HasDependentArg) { 1359 // Can't check initialization for a base of dependent type or when 1360 // any of the arguments are type-dependent expressions. 1361 OwningExprResult BaseInit 1362 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1363 RParenLoc)); 1364 1365 // Erase any temporaries within this evaluation context; we're not 1366 // going to track them in the AST, since we'll be rebuilding the 1367 // ASTs during template instantiation. 1368 ExprTemporaries.erase( 1369 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1370 ExprTemporaries.end()); 1371 1372 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1373 /*IsVirtual=*/false, 1374 LParenLoc, 1375 BaseInit.takeAs<Expr>(), 1376 RParenLoc); 1377 } 1378 1379 if (!BaseType->isRecordType()) 1380 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1381 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1382 1383 // C++ [class.base.init]p2: 1384 // [...] Unless the mem-initializer-id names a nonstatic data 1385 // member of the constructor’s class or a direct or virtual base 1386 // of that class, the mem-initializer is ill-formed. A 1387 // mem-initializer-list can initialize a base class using any 1388 // name that denotes that base class type. 1389 1390 // Check for direct and virtual base classes. 1391 const CXXBaseSpecifier *DirectBaseSpec = 0; 1392 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1393 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1394 VirtualBaseSpec); 1395 1396 // C++ [base.class.init]p2: 1397 // If a mem-initializer-id is ambiguous because it designates both 1398 // a direct non-virtual base class and an inherited virtual base 1399 // class, the mem-initializer is ill-formed. 1400 if (DirectBaseSpec && VirtualBaseSpec) 1401 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1402 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1403 // C++ [base.class.init]p2: 1404 // Unless the mem-initializer-id names a nonstatic data membeer of the 1405 // constructor's class ot a direst or virtual base of that class, the 1406 // mem-initializer is ill-formed. 1407 if (!DirectBaseSpec && !VirtualBaseSpec) 1408 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1409 << BaseType << Context.getTypeDeclType(ClassDecl) 1410 << BaseTInfo->getTypeLoc().getSourceRange(); 1411 1412 CXXBaseSpecifier *BaseSpec 1413 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1414 if (!BaseSpec) 1415 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1416 1417 // Initialize the base. 1418 InitializedEntity BaseEntity = 1419 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1420 InitializationKind Kind = 1421 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1422 1423 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1424 1425 OwningExprResult BaseInit = 1426 InitSeq.Perform(*this, BaseEntity, Kind, 1427 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1428 if (BaseInit.isInvalid()) 1429 return true; 1430 1431 // C++0x [class.base.init]p7: 1432 // The initialization of each base and member constitutes a 1433 // full-expression. 1434 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1435 if (BaseInit.isInvalid()) 1436 return true; 1437 1438 // If we are in a dependent context, template instantiation will 1439 // perform this type-checking again. Just save the arguments that we 1440 // received in a ParenListExpr. 1441 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1442 // of the information that we have about the base 1443 // initializer. However, deconstructing the ASTs is a dicey process, 1444 // and this approach is far more likely to get the corner cases right. 1445 if (CurContext->isDependentContext()) { 1446 // Bump the reference count of all of the arguments. 1447 for (unsigned I = 0; I != NumArgs; ++I) 1448 Args[I]->Retain(); 1449 1450 OwningExprResult Init 1451 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1452 RParenLoc)); 1453 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1454 BaseSpec->isVirtual(), 1455 LParenLoc, 1456 Init.takeAs<Expr>(), 1457 RParenLoc); 1458 } 1459 1460 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1461 BaseSpec->isVirtual(), 1462 LParenLoc, 1463 BaseInit.takeAs<Expr>(), 1464 RParenLoc); 1465} 1466 1467/// ImplicitInitializerKind - How an implicit base or member initializer should 1468/// initialize its base or member. 1469enum ImplicitInitializerKind { 1470 IIK_Default, 1471 IIK_Copy, 1472 IIK_Move 1473}; 1474 1475static bool 1476BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1477 ImplicitInitializerKind ImplicitInitKind, 1478 CXXBaseSpecifier *BaseSpec, 1479 bool IsInheritedVirtualBase, 1480 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1481 InitializedEntity InitEntity 1482 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1483 IsInheritedVirtualBase); 1484 1485 Sema::OwningExprResult BaseInit(SemaRef); 1486 1487 switch (ImplicitInitKind) { 1488 case IIK_Default: { 1489 InitializationKind InitKind 1490 = InitializationKind::CreateDefault(Constructor->getLocation()); 1491 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1492 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1493 Sema::MultiExprArg(SemaRef, 0, 0)); 1494 break; 1495 } 1496 1497 case IIK_Copy: { 1498 ParmVarDecl *Param = Constructor->getParamDecl(0); 1499 QualType ParamType = Param->getType().getNonReferenceType(); 1500 1501 Expr *CopyCtorArg = 1502 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1503 SourceLocation(), ParamType, 0); 1504 1505 // Cast to the base class to avoid ambiguities. 1506 QualType ArgTy = 1507 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1508 ParamType.getQualifiers()); 1509 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1510 CastExpr::CK_UncheckedDerivedToBase, 1511 /*isLvalue=*/true, 1512 CXXBaseSpecifierArray(BaseSpec)); 1513 1514 InitializationKind InitKind 1515 = InitializationKind::CreateDirect(Constructor->getLocation(), 1516 SourceLocation(), SourceLocation()); 1517 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1518 &CopyCtorArg, 1); 1519 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1520 Sema::MultiExprArg(SemaRef, 1521 (void**)&CopyCtorArg, 1)); 1522 break; 1523 } 1524 1525 case IIK_Move: 1526 assert(false && "Unhandled initializer kind!"); 1527 } 1528 1529 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1530 if (BaseInit.isInvalid()) 1531 return true; 1532 1533 CXXBaseInit = 1534 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1535 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1536 SourceLocation()), 1537 BaseSpec->isVirtual(), 1538 SourceLocation(), 1539 BaseInit.takeAs<Expr>(), 1540 SourceLocation()); 1541 1542 return false; 1543} 1544 1545static bool 1546BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1547 ImplicitInitializerKind ImplicitInitKind, 1548 FieldDecl *Field, 1549 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1550 if (ImplicitInitKind == IIK_Copy) { 1551 // FIXME: We should not return early here, but will do so until 1552 // we know how to handle copy initialization of arrays. 1553 CXXMemberInit = 0; 1554 return false; 1555 1556 ParmVarDecl *Param = Constructor->getParamDecl(0); 1557 QualType ParamType = Param->getType().getNonReferenceType(); 1558 1559 Expr *MemberExprBase = 1560 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1561 SourceLocation(), ParamType, 0); 1562 1563 1564 Expr *CopyCtorArg = 1565 MemberExpr::Create(SemaRef.Context, MemberExprBase, /*IsArrow=*/false, 1566 0, SourceRange(), Field, 1567 DeclAccessPair::make(Field, Field->getAccess()), 1568 SourceLocation(), 0, 1569 Field->getType().getNonReferenceType()); 1570 1571 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1572 InitializationKind InitKind = 1573 InitializationKind::CreateDirect(Constructor->getLocation(), 1574 SourceLocation(), SourceLocation()); 1575 1576 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1577 &CopyCtorArg, 1); 1578 1579 Sema::OwningExprResult MemberInit = 1580 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1581 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArg, 1), 0); 1582 if (MemberInit.isInvalid()) 1583 return true; 1584 1585 CXXMemberInit = 0; 1586 return false; 1587 } 1588 1589 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1590 1591 QualType FieldBaseElementType = 1592 SemaRef.Context.getBaseElementType(Field->getType()); 1593 1594 if (FieldBaseElementType->isRecordType()) { 1595 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1596 InitializationKind InitKind = 1597 InitializationKind::CreateDefault(Constructor->getLocation()); 1598 1599 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1600 Sema::OwningExprResult MemberInit = 1601 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1602 Sema::MultiExprArg(SemaRef, 0, 0)); 1603 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1604 if (MemberInit.isInvalid()) 1605 return true; 1606 1607 CXXMemberInit = 1608 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1609 Field, SourceLocation(), 1610 SourceLocation(), 1611 MemberInit.takeAs<Expr>(), 1612 SourceLocation()); 1613 return false; 1614 } 1615 1616 if (FieldBaseElementType->isReferenceType()) { 1617 SemaRef.Diag(Constructor->getLocation(), 1618 diag::err_uninitialized_member_in_ctor) 1619 << (int)Constructor->isImplicit() 1620 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1621 << 0 << Field->getDeclName(); 1622 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1623 return true; 1624 } 1625 1626 if (FieldBaseElementType.isConstQualified()) { 1627 SemaRef.Diag(Constructor->getLocation(), 1628 diag::err_uninitialized_member_in_ctor) 1629 << (int)Constructor->isImplicit() 1630 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1631 << 1 << Field->getDeclName(); 1632 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1633 return true; 1634 } 1635 1636 // Nothing to initialize. 1637 CXXMemberInit = 0; 1638 return false; 1639} 1640 1641bool 1642Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1643 CXXBaseOrMemberInitializer **Initializers, 1644 unsigned NumInitializers, 1645 bool AnyErrors) { 1646 if (Constructor->getDeclContext()->isDependentContext()) { 1647 // Just store the initializers as written, they will be checked during 1648 // instantiation. 1649 if (NumInitializers > 0) { 1650 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1651 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1652 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1653 memcpy(baseOrMemberInitializers, Initializers, 1654 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1655 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1656 } 1657 1658 return false; 1659 } 1660 1661 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1662 1663 // FIXME: Handle implicit move constructors. 1664 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1665 ImplicitInitKind = IIK_Copy; 1666 1667 // We need to build the initializer AST according to order of construction 1668 // and not what user specified in the Initializers list. 1669 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1670 if (!ClassDecl) 1671 return true; 1672 1673 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1674 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1675 bool HadError = false; 1676 1677 for (unsigned i = 0; i < NumInitializers; i++) { 1678 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1679 1680 if (Member->isBaseInitializer()) 1681 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1682 else 1683 AllBaseFields[Member->getMember()] = Member; 1684 } 1685 1686 // Keep track of the direct virtual bases. 1687 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1688 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1689 E = ClassDecl->bases_end(); I != E; ++I) { 1690 if (I->isVirtual()) 1691 DirectVBases.insert(I); 1692 } 1693 1694 // Push virtual bases before others. 1695 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1696 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1697 1698 if (CXXBaseOrMemberInitializer *Value 1699 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1700 AllToInit.push_back(Value); 1701 } else if (!AnyErrors) { 1702 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1703 CXXBaseOrMemberInitializer *CXXBaseInit; 1704 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1705 VBase, IsInheritedVirtualBase, 1706 CXXBaseInit)) { 1707 HadError = true; 1708 continue; 1709 } 1710 1711 AllToInit.push_back(CXXBaseInit); 1712 } 1713 } 1714 1715 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1716 E = ClassDecl->bases_end(); Base != E; ++Base) { 1717 // Virtuals are in the virtual base list and already constructed. 1718 if (Base->isVirtual()) 1719 continue; 1720 1721 if (CXXBaseOrMemberInitializer *Value 1722 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1723 AllToInit.push_back(Value); 1724 } else if (!AnyErrors) { 1725 CXXBaseOrMemberInitializer *CXXBaseInit; 1726 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1727 Base, /*IsInheritedVirtualBase=*/false, 1728 CXXBaseInit)) { 1729 HadError = true; 1730 continue; 1731 } 1732 1733 AllToInit.push_back(CXXBaseInit); 1734 } 1735 } 1736 1737 // non-static data members. 1738 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1739 E = ClassDecl->field_end(); Field != E; ++Field) { 1740 if ((*Field)->isAnonymousStructOrUnion()) { 1741 if (const RecordType *FieldClassType = 1742 Field->getType()->getAs<RecordType>()) { 1743 CXXRecordDecl *FieldClassDecl 1744 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1745 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1746 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1747 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1748 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1749 // set to the anonymous union data member used in the initializer 1750 // list. 1751 Value->setMember(*Field); 1752 Value->setAnonUnionMember(*FA); 1753 AllToInit.push_back(Value); 1754 break; 1755 } 1756 } 1757 } 1758 continue; 1759 } 1760 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1761 AllToInit.push_back(Value); 1762 continue; 1763 } 1764 1765 if (AnyErrors) 1766 continue; 1767 1768 CXXBaseOrMemberInitializer *Member; 1769 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1770 *Field, Member)) { 1771 HadError = true; 1772 continue; 1773 } 1774 1775 // If the member doesn't need to be initialized, it will be null. 1776 if (Member) 1777 AllToInit.push_back(Member); 1778 } 1779 1780 NumInitializers = AllToInit.size(); 1781 if (NumInitializers > 0) { 1782 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1783 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1784 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1785 memcpy(baseOrMemberInitializers, AllToInit.data(), 1786 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1787 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1788 1789 // Constructors implicitly reference the base and member 1790 // destructors. 1791 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1792 Constructor->getParent()); 1793 } 1794 1795 return HadError; 1796} 1797 1798static void *GetKeyForTopLevelField(FieldDecl *Field) { 1799 // For anonymous unions, use the class declaration as the key. 1800 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1801 if (RT->getDecl()->isAnonymousStructOrUnion()) 1802 return static_cast<void *>(RT->getDecl()); 1803 } 1804 return static_cast<void *>(Field); 1805} 1806 1807static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1808 return Context.getCanonicalType(BaseType).getTypePtr(); 1809} 1810 1811static void *GetKeyForMember(ASTContext &Context, 1812 CXXBaseOrMemberInitializer *Member, 1813 bool MemberMaybeAnon = false) { 1814 if (!Member->isMemberInitializer()) 1815 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1816 1817 // For fields injected into the class via declaration of an anonymous union, 1818 // use its anonymous union class declaration as the unique key. 1819 FieldDecl *Field = Member->getMember(); 1820 1821 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1822 // data member of the class. Data member used in the initializer list is 1823 // in AnonUnionMember field. 1824 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1825 Field = Member->getAnonUnionMember(); 1826 1827 // If the field is a member of an anonymous struct or union, our key 1828 // is the anonymous record decl that's a direct child of the class. 1829 RecordDecl *RD = Field->getParent(); 1830 if (RD->isAnonymousStructOrUnion()) { 1831 while (true) { 1832 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1833 if (Parent->isAnonymousStructOrUnion()) 1834 RD = Parent; 1835 else 1836 break; 1837 } 1838 1839 return static_cast<void *>(RD); 1840 } 1841 1842 return static_cast<void *>(Field); 1843} 1844 1845static void 1846DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1847 const CXXConstructorDecl *Constructor, 1848 CXXBaseOrMemberInitializer **Inits, 1849 unsigned NumInits) { 1850 if (Constructor->getDeclContext()->isDependentContext()) 1851 return; 1852 1853 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1854 == Diagnostic::Ignored) 1855 return; 1856 1857 // Build the list of bases and members in the order that they'll 1858 // actually be initialized. The explicit initializers should be in 1859 // this same order but may be missing things. 1860 llvm::SmallVector<const void*, 32> IdealInitKeys; 1861 1862 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1863 1864 // 1. Virtual bases. 1865 for (CXXRecordDecl::base_class_const_iterator VBase = 1866 ClassDecl->vbases_begin(), 1867 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1868 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1869 1870 // 2. Non-virtual bases. 1871 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1872 E = ClassDecl->bases_end(); Base != E; ++Base) { 1873 if (Base->isVirtual()) 1874 continue; 1875 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1876 } 1877 1878 // 3. Direct fields. 1879 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1880 E = ClassDecl->field_end(); Field != E; ++Field) 1881 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1882 1883 unsigned NumIdealInits = IdealInitKeys.size(); 1884 unsigned IdealIndex = 0; 1885 1886 CXXBaseOrMemberInitializer *PrevInit = 0; 1887 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1888 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1889 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1890 1891 // Scan forward to try to find this initializer in the idealized 1892 // initializers list. 1893 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1894 if (InitKey == IdealInitKeys[IdealIndex]) 1895 break; 1896 1897 // If we didn't find this initializer, it must be because we 1898 // scanned past it on a previous iteration. That can only 1899 // happen if we're out of order; emit a warning. 1900 if (IdealIndex == NumIdealInits) { 1901 assert(PrevInit && "initializer not found in initializer list"); 1902 1903 Sema::SemaDiagnosticBuilder D = 1904 SemaRef.Diag(PrevInit->getSourceLocation(), 1905 diag::warn_initializer_out_of_order); 1906 1907 if (PrevInit->isMemberInitializer()) 1908 D << 0 << PrevInit->getMember()->getDeclName(); 1909 else 1910 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1911 1912 if (Init->isMemberInitializer()) 1913 D << 0 << Init->getMember()->getDeclName(); 1914 else 1915 D << 1 << Init->getBaseClassInfo()->getType(); 1916 1917 // Move back to the initializer's location in the ideal list. 1918 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1919 if (InitKey == IdealInitKeys[IdealIndex]) 1920 break; 1921 1922 assert(IdealIndex != NumIdealInits && 1923 "initializer not found in initializer list"); 1924 } 1925 1926 PrevInit = Init; 1927 } 1928} 1929 1930namespace { 1931bool CheckRedundantInit(Sema &S, 1932 CXXBaseOrMemberInitializer *Init, 1933 CXXBaseOrMemberInitializer *&PrevInit) { 1934 if (!PrevInit) { 1935 PrevInit = Init; 1936 return false; 1937 } 1938 1939 if (FieldDecl *Field = Init->getMember()) 1940 S.Diag(Init->getSourceLocation(), 1941 diag::err_multiple_mem_initialization) 1942 << Field->getDeclName() 1943 << Init->getSourceRange(); 1944 else { 1945 Type *BaseClass = Init->getBaseClass(); 1946 assert(BaseClass && "neither field nor base"); 1947 S.Diag(Init->getSourceLocation(), 1948 diag::err_multiple_base_initialization) 1949 << QualType(BaseClass, 0) 1950 << Init->getSourceRange(); 1951 } 1952 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1953 << 0 << PrevInit->getSourceRange(); 1954 1955 return true; 1956} 1957 1958typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1959typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1960 1961bool CheckRedundantUnionInit(Sema &S, 1962 CXXBaseOrMemberInitializer *Init, 1963 RedundantUnionMap &Unions) { 1964 FieldDecl *Field = Init->getMember(); 1965 RecordDecl *Parent = Field->getParent(); 1966 if (!Parent->isAnonymousStructOrUnion()) 1967 return false; 1968 1969 NamedDecl *Child = Field; 1970 do { 1971 if (Parent->isUnion()) { 1972 UnionEntry &En = Unions[Parent]; 1973 if (En.first && En.first != Child) { 1974 S.Diag(Init->getSourceLocation(), 1975 diag::err_multiple_mem_union_initialization) 1976 << Field->getDeclName() 1977 << Init->getSourceRange(); 1978 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1979 << 0 << En.second->getSourceRange(); 1980 return true; 1981 } else if (!En.first) { 1982 En.first = Child; 1983 En.second = Init; 1984 } 1985 } 1986 1987 Child = Parent; 1988 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1989 } while (Parent->isAnonymousStructOrUnion()); 1990 1991 return false; 1992} 1993} 1994 1995/// ActOnMemInitializers - Handle the member initializers for a constructor. 1996void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1997 SourceLocation ColonLoc, 1998 MemInitTy **meminits, unsigned NumMemInits, 1999 bool AnyErrors) { 2000 if (!ConstructorDecl) 2001 return; 2002 2003 AdjustDeclIfTemplate(ConstructorDecl); 2004 2005 CXXConstructorDecl *Constructor 2006 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2007 2008 if (!Constructor) { 2009 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2010 return; 2011 } 2012 2013 CXXBaseOrMemberInitializer **MemInits = 2014 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2015 2016 // Mapping for the duplicate initializers check. 2017 // For member initializers, this is keyed with a FieldDecl*. 2018 // For base initializers, this is keyed with a Type*. 2019 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2020 2021 // Mapping for the inconsistent anonymous-union initializers check. 2022 RedundantUnionMap MemberUnions; 2023 2024 bool HadError = false; 2025 for (unsigned i = 0; i < NumMemInits; i++) { 2026 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2027 2028 if (Init->isMemberInitializer()) { 2029 FieldDecl *Field = Init->getMember(); 2030 if (CheckRedundantInit(*this, Init, Members[Field]) || 2031 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2032 HadError = true; 2033 } else { 2034 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2035 if (CheckRedundantInit(*this, Init, Members[Key])) 2036 HadError = true; 2037 } 2038 } 2039 2040 if (HadError) 2041 return; 2042 2043 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2044 2045 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2046} 2047 2048void 2049Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2050 CXXRecordDecl *ClassDecl) { 2051 // Ignore dependent contexts. 2052 if (ClassDecl->isDependentContext()) 2053 return; 2054 2055 // FIXME: all the access-control diagnostics are positioned on the 2056 // field/base declaration. That's probably good; that said, the 2057 // user might reasonably want to know why the destructor is being 2058 // emitted, and we currently don't say. 2059 2060 // Non-static data members. 2061 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2062 E = ClassDecl->field_end(); I != E; ++I) { 2063 FieldDecl *Field = *I; 2064 2065 QualType FieldType = Context.getBaseElementType(Field->getType()); 2066 2067 const RecordType* RT = FieldType->getAs<RecordType>(); 2068 if (!RT) 2069 continue; 2070 2071 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2072 if (FieldClassDecl->hasTrivialDestructor()) 2073 continue; 2074 2075 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2076 CheckDestructorAccess(Field->getLocation(), Dtor, 2077 PDiag(diag::err_access_dtor_field) 2078 << Field->getDeclName() 2079 << FieldType); 2080 2081 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2082 } 2083 2084 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2085 2086 // Bases. 2087 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2088 E = ClassDecl->bases_end(); Base != E; ++Base) { 2089 // Bases are always records in a well-formed non-dependent class. 2090 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2091 2092 // Remember direct virtual bases. 2093 if (Base->isVirtual()) 2094 DirectVirtualBases.insert(RT); 2095 2096 // Ignore trivial destructors. 2097 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2098 if (BaseClassDecl->hasTrivialDestructor()) 2099 continue; 2100 2101 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2102 2103 // FIXME: caret should be on the start of the class name 2104 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2105 PDiag(diag::err_access_dtor_base) 2106 << Base->getType() 2107 << Base->getSourceRange()); 2108 2109 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2110 } 2111 2112 // Virtual bases. 2113 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2114 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2115 2116 // Bases are always records in a well-formed non-dependent class. 2117 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2118 2119 // Ignore direct virtual bases. 2120 if (DirectVirtualBases.count(RT)) 2121 continue; 2122 2123 // Ignore trivial destructors. 2124 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2125 if (BaseClassDecl->hasTrivialDestructor()) 2126 continue; 2127 2128 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2129 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2130 PDiag(diag::err_access_dtor_vbase) 2131 << VBase->getType()); 2132 2133 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2134 } 2135} 2136 2137void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2138 if (!CDtorDecl) 2139 return; 2140 2141 if (CXXConstructorDecl *Constructor 2142 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2143 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2144} 2145 2146bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2147 unsigned DiagID, AbstractDiagSelID SelID, 2148 const CXXRecordDecl *CurrentRD) { 2149 if (SelID == -1) 2150 return RequireNonAbstractType(Loc, T, 2151 PDiag(DiagID), CurrentRD); 2152 else 2153 return RequireNonAbstractType(Loc, T, 2154 PDiag(DiagID) << SelID, CurrentRD); 2155} 2156 2157bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2158 const PartialDiagnostic &PD, 2159 const CXXRecordDecl *CurrentRD) { 2160 if (!getLangOptions().CPlusPlus) 2161 return false; 2162 2163 if (const ArrayType *AT = Context.getAsArrayType(T)) 2164 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2165 CurrentRD); 2166 2167 if (const PointerType *PT = T->getAs<PointerType>()) { 2168 // Find the innermost pointer type. 2169 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2170 PT = T; 2171 2172 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2173 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2174 } 2175 2176 const RecordType *RT = T->getAs<RecordType>(); 2177 if (!RT) 2178 return false; 2179 2180 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2181 2182 if (CurrentRD && CurrentRD != RD) 2183 return false; 2184 2185 // FIXME: is this reasonable? It matches current behavior, but.... 2186 if (!RD->getDefinition()) 2187 return false; 2188 2189 if (!RD->isAbstract()) 2190 return false; 2191 2192 Diag(Loc, PD) << RD->getDeclName(); 2193 2194 // Check if we've already emitted the list of pure virtual functions for this 2195 // class. 2196 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2197 return true; 2198 2199 CXXFinalOverriderMap FinalOverriders; 2200 RD->getFinalOverriders(FinalOverriders); 2201 2202 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2203 MEnd = FinalOverriders.end(); 2204 M != MEnd; 2205 ++M) { 2206 for (OverridingMethods::iterator SO = M->second.begin(), 2207 SOEnd = M->second.end(); 2208 SO != SOEnd; ++SO) { 2209 // C++ [class.abstract]p4: 2210 // A class is abstract if it contains or inherits at least one 2211 // pure virtual function for which the final overrider is pure 2212 // virtual. 2213 2214 // 2215 if (SO->second.size() != 1) 2216 continue; 2217 2218 if (!SO->second.front().Method->isPure()) 2219 continue; 2220 2221 Diag(SO->second.front().Method->getLocation(), 2222 diag::note_pure_virtual_function) 2223 << SO->second.front().Method->getDeclName(); 2224 } 2225 } 2226 2227 if (!PureVirtualClassDiagSet) 2228 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2229 PureVirtualClassDiagSet->insert(RD); 2230 2231 return true; 2232} 2233 2234namespace { 2235 class AbstractClassUsageDiagnoser 2236 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2237 Sema &SemaRef; 2238 CXXRecordDecl *AbstractClass; 2239 2240 bool VisitDeclContext(const DeclContext *DC) { 2241 bool Invalid = false; 2242 2243 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2244 E = DC->decls_end(); I != E; ++I) 2245 Invalid |= Visit(*I); 2246 2247 return Invalid; 2248 } 2249 2250 public: 2251 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2252 : SemaRef(SemaRef), AbstractClass(ac) { 2253 Visit(SemaRef.Context.getTranslationUnitDecl()); 2254 } 2255 2256 bool VisitFunctionDecl(const FunctionDecl *FD) { 2257 if (FD->isThisDeclarationADefinition()) { 2258 // No need to do the check if we're in a definition, because it requires 2259 // that the return/param types are complete. 2260 // because that requires 2261 return VisitDeclContext(FD); 2262 } 2263 2264 // Check the return type. 2265 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2266 bool Invalid = 2267 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2268 diag::err_abstract_type_in_decl, 2269 Sema::AbstractReturnType, 2270 AbstractClass); 2271 2272 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2273 E = FD->param_end(); I != E; ++I) { 2274 const ParmVarDecl *VD = *I; 2275 Invalid |= 2276 SemaRef.RequireNonAbstractType(VD->getLocation(), 2277 VD->getOriginalType(), 2278 diag::err_abstract_type_in_decl, 2279 Sema::AbstractParamType, 2280 AbstractClass); 2281 } 2282 2283 return Invalid; 2284 } 2285 2286 bool VisitDecl(const Decl* D) { 2287 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2288 return VisitDeclContext(DC); 2289 2290 return false; 2291 } 2292 }; 2293} 2294 2295/// \brief Perform semantic checks on a class definition that has been 2296/// completing, introducing implicitly-declared members, checking for 2297/// abstract types, etc. 2298void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2299 if (!Record || Record->isInvalidDecl()) 2300 return; 2301 2302 if (!Record->isDependentType()) 2303 AddImplicitlyDeclaredMembersToClass(S, Record); 2304 2305 if (Record->isInvalidDecl()) 2306 return; 2307 2308 // Set access bits correctly on the directly-declared conversions. 2309 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2310 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2311 Convs->setAccess(I, (*I)->getAccess()); 2312 2313 // Determine whether we need to check for final overriders. We do 2314 // this either when there are virtual base classes (in which case we 2315 // may end up finding multiple final overriders for a given virtual 2316 // function) or any of the base classes is abstract (in which case 2317 // we might detect that this class is abstract). 2318 bool CheckFinalOverriders = false; 2319 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2320 !Record->isDependentType()) { 2321 if (Record->getNumVBases()) 2322 CheckFinalOverriders = true; 2323 else if (!Record->isAbstract()) { 2324 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2325 BEnd = Record->bases_end(); 2326 B != BEnd; ++B) { 2327 CXXRecordDecl *BaseDecl 2328 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2329 if (BaseDecl->isAbstract()) { 2330 CheckFinalOverriders = true; 2331 break; 2332 } 2333 } 2334 } 2335 } 2336 2337 if (CheckFinalOverriders) { 2338 CXXFinalOverriderMap FinalOverriders; 2339 Record->getFinalOverriders(FinalOverriders); 2340 2341 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2342 MEnd = FinalOverriders.end(); 2343 M != MEnd; ++M) { 2344 for (OverridingMethods::iterator SO = M->second.begin(), 2345 SOEnd = M->second.end(); 2346 SO != SOEnd; ++SO) { 2347 assert(SO->second.size() > 0 && 2348 "All virtual functions have overridding virtual functions"); 2349 if (SO->second.size() == 1) { 2350 // C++ [class.abstract]p4: 2351 // A class is abstract if it contains or inherits at least one 2352 // pure virtual function for which the final overrider is pure 2353 // virtual. 2354 if (SO->second.front().Method->isPure()) 2355 Record->setAbstract(true); 2356 continue; 2357 } 2358 2359 // C++ [class.virtual]p2: 2360 // In a derived class, if a virtual member function of a base 2361 // class subobject has more than one final overrider the 2362 // program is ill-formed. 2363 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2364 << (NamedDecl *)M->first << Record; 2365 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2366 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2367 OMEnd = SO->second.end(); 2368 OM != OMEnd; ++OM) 2369 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2370 << (NamedDecl *)M->first << OM->Method->getParent(); 2371 2372 Record->setInvalidDecl(); 2373 } 2374 } 2375 } 2376 2377 if (Record->isAbstract() && !Record->isInvalidDecl()) 2378 (void)AbstractClassUsageDiagnoser(*this, Record); 2379 2380 // If this is not an aggregate type and has no user-declared constructor, 2381 // complain about any non-static data members of reference or const scalar 2382 // type, since they will never get initializers. 2383 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2384 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2385 bool Complained = false; 2386 for (RecordDecl::field_iterator F = Record->field_begin(), 2387 FEnd = Record->field_end(); 2388 F != FEnd; ++F) { 2389 if (F->getType()->isReferenceType() || 2390 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2391 if (!Complained) { 2392 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2393 << Record->getTagKind() << Record; 2394 Complained = true; 2395 } 2396 2397 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2398 << F->getType()->isReferenceType() 2399 << F->getDeclName(); 2400 } 2401 } 2402 } 2403} 2404 2405void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2406 DeclPtrTy TagDecl, 2407 SourceLocation LBrac, 2408 SourceLocation RBrac, 2409 AttributeList *AttrList) { 2410 if (!TagDecl) 2411 return; 2412 2413 AdjustDeclIfTemplate(TagDecl); 2414 2415 ActOnFields(S, RLoc, TagDecl, 2416 (DeclPtrTy*)FieldCollector->getCurFields(), 2417 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2418 2419 CheckCompletedCXXClass(S, 2420 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2421} 2422 2423/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2424/// special functions, such as the default constructor, copy 2425/// constructor, or destructor, to the given C++ class (C++ 2426/// [special]p1). This routine can only be executed just before the 2427/// definition of the class is complete. 2428/// 2429/// The scope, if provided, is the class scope. 2430void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2431 CXXRecordDecl *ClassDecl) { 2432 CanQualType ClassType 2433 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2434 2435 // FIXME: Implicit declarations have exception specifications, which are 2436 // the union of the specifications of the implicitly called functions. 2437 2438 if (!ClassDecl->hasUserDeclaredConstructor()) { 2439 // C++ [class.ctor]p5: 2440 // A default constructor for a class X is a constructor of class X 2441 // that can be called without an argument. If there is no 2442 // user-declared constructor for class X, a default constructor is 2443 // implicitly declared. An implicitly-declared default constructor 2444 // is an inline public member of its class. 2445 DeclarationName Name 2446 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2447 CXXConstructorDecl *DefaultCon = 2448 CXXConstructorDecl::Create(Context, ClassDecl, 2449 ClassDecl->getLocation(), Name, 2450 Context.getFunctionType(Context.VoidTy, 2451 0, 0, false, 0, 2452 /*FIXME*/false, false, 2453 0, 0, 2454 FunctionType::ExtInfo()), 2455 /*TInfo=*/0, 2456 /*isExplicit=*/false, 2457 /*isInline=*/true, 2458 /*isImplicitlyDeclared=*/true); 2459 DefaultCon->setAccess(AS_public); 2460 DefaultCon->setImplicit(); 2461 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2462 if (S) 2463 PushOnScopeChains(DefaultCon, S, true); 2464 else 2465 ClassDecl->addDecl(DefaultCon); 2466 } 2467 2468 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2469 // C++ [class.copy]p4: 2470 // If the class definition does not explicitly declare a copy 2471 // constructor, one is declared implicitly. 2472 2473 // C++ [class.copy]p5: 2474 // The implicitly-declared copy constructor for a class X will 2475 // have the form 2476 // 2477 // X::X(const X&) 2478 // 2479 // if 2480 bool HasConstCopyConstructor = true; 2481 2482 // -- each direct or virtual base class B of X has a copy 2483 // constructor whose first parameter is of type const B& or 2484 // const volatile B&, and 2485 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2486 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2487 const CXXRecordDecl *BaseClassDecl 2488 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2489 HasConstCopyConstructor 2490 = BaseClassDecl->hasConstCopyConstructor(Context); 2491 } 2492 2493 // -- for all the nonstatic data members of X that are of a 2494 // class type M (or array thereof), each such class type 2495 // has a copy constructor whose first parameter is of type 2496 // const M& or const volatile M&. 2497 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2498 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2499 ++Field) { 2500 QualType FieldType = (*Field)->getType(); 2501 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2502 FieldType = Array->getElementType(); 2503 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2504 const CXXRecordDecl *FieldClassDecl 2505 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2506 HasConstCopyConstructor 2507 = FieldClassDecl->hasConstCopyConstructor(Context); 2508 } 2509 } 2510 2511 // Otherwise, the implicitly declared copy constructor will have 2512 // the form 2513 // 2514 // X::X(X&) 2515 QualType ArgType = ClassType; 2516 if (HasConstCopyConstructor) 2517 ArgType = ArgType.withConst(); 2518 ArgType = Context.getLValueReferenceType(ArgType); 2519 2520 // An implicitly-declared copy constructor is an inline public 2521 // member of its class. 2522 DeclarationName Name 2523 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2524 CXXConstructorDecl *CopyConstructor 2525 = CXXConstructorDecl::Create(Context, ClassDecl, 2526 ClassDecl->getLocation(), Name, 2527 Context.getFunctionType(Context.VoidTy, 2528 &ArgType, 1, 2529 false, 0, 2530 /*FIXME:*/false, 2531 false, 0, 0, 2532 FunctionType::ExtInfo()), 2533 /*TInfo=*/0, 2534 /*isExplicit=*/false, 2535 /*isInline=*/true, 2536 /*isImplicitlyDeclared=*/true); 2537 CopyConstructor->setAccess(AS_public); 2538 CopyConstructor->setImplicit(); 2539 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2540 2541 // Add the parameter to the constructor. 2542 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2543 ClassDecl->getLocation(), 2544 /*IdentifierInfo=*/0, 2545 ArgType, /*TInfo=*/0, 2546 VarDecl::None, 2547 VarDecl::None, 0); 2548 CopyConstructor->setParams(&FromParam, 1); 2549 if (S) 2550 PushOnScopeChains(CopyConstructor, S, true); 2551 else 2552 ClassDecl->addDecl(CopyConstructor); 2553 } 2554 2555 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2556 // Note: The following rules are largely analoguous to the copy 2557 // constructor rules. Note that virtual bases are not taken into account 2558 // for determining the argument type of the operator. Note also that 2559 // operators taking an object instead of a reference are allowed. 2560 // 2561 // C++ [class.copy]p10: 2562 // If the class definition does not explicitly declare a copy 2563 // assignment operator, one is declared implicitly. 2564 // The implicitly-defined copy assignment operator for a class X 2565 // will have the form 2566 // 2567 // X& X::operator=(const X&) 2568 // 2569 // if 2570 bool HasConstCopyAssignment = true; 2571 2572 // -- each direct base class B of X has a copy assignment operator 2573 // whose parameter is of type const B&, const volatile B& or B, 2574 // and 2575 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2576 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2577 assert(!Base->getType()->isDependentType() && 2578 "Cannot generate implicit members for class with dependent bases."); 2579 const CXXRecordDecl *BaseClassDecl 2580 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2581 const CXXMethodDecl *MD = 0; 2582 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2583 MD); 2584 } 2585 2586 // -- for all the nonstatic data members of X that are of a class 2587 // type M (or array thereof), each such class type has a copy 2588 // assignment operator whose parameter is of type const M&, 2589 // const volatile M& or M. 2590 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2591 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2592 ++Field) { 2593 QualType FieldType = (*Field)->getType(); 2594 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2595 FieldType = Array->getElementType(); 2596 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2597 const CXXRecordDecl *FieldClassDecl 2598 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2599 const CXXMethodDecl *MD = 0; 2600 HasConstCopyAssignment 2601 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2602 } 2603 } 2604 2605 // Otherwise, the implicitly declared copy assignment operator will 2606 // have the form 2607 // 2608 // X& X::operator=(X&) 2609 QualType ArgType = ClassType; 2610 QualType RetType = Context.getLValueReferenceType(ArgType); 2611 if (HasConstCopyAssignment) 2612 ArgType = ArgType.withConst(); 2613 ArgType = Context.getLValueReferenceType(ArgType); 2614 2615 // An implicitly-declared copy assignment operator is an inline public 2616 // member of its class. 2617 DeclarationName Name = 2618 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2619 CXXMethodDecl *CopyAssignment = 2620 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2621 Context.getFunctionType(RetType, &ArgType, 1, 2622 false, 0, 2623 /*FIXME:*/false, 2624 false, 0, 0, 2625 FunctionType::ExtInfo()), 2626 /*TInfo=*/0, /*isStatic=*/false, 2627 /*StorageClassAsWritten=*/FunctionDecl::None, 2628 /*isInline=*/true); 2629 CopyAssignment->setAccess(AS_public); 2630 CopyAssignment->setImplicit(); 2631 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2632 CopyAssignment->setCopyAssignment(true); 2633 2634 // Add the parameter to the operator. 2635 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2636 ClassDecl->getLocation(), 2637 /*IdentifierInfo=*/0, 2638 ArgType, /*TInfo=*/0, 2639 VarDecl::None, 2640 VarDecl::None, 0); 2641 CopyAssignment->setParams(&FromParam, 1); 2642 2643 // Don't call addedAssignmentOperator. There is no way to distinguish an 2644 // implicit from an explicit assignment operator. 2645 if (S) 2646 PushOnScopeChains(CopyAssignment, S, true); 2647 else 2648 ClassDecl->addDecl(CopyAssignment); 2649 AddOverriddenMethods(ClassDecl, CopyAssignment); 2650 } 2651 2652 if (!ClassDecl->hasUserDeclaredDestructor()) { 2653 // C++ [class.dtor]p2: 2654 // If a class has no user-declared destructor, a destructor is 2655 // declared implicitly. An implicitly-declared destructor is an 2656 // inline public member of its class. 2657 QualType Ty = Context.getFunctionType(Context.VoidTy, 2658 0, 0, false, 0, 2659 /*FIXME:*/false, 2660 false, 0, 0, FunctionType::ExtInfo()); 2661 2662 DeclarationName Name 2663 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2664 CXXDestructorDecl *Destructor 2665 = CXXDestructorDecl::Create(Context, ClassDecl, 2666 ClassDecl->getLocation(), Name, Ty, 2667 /*isInline=*/true, 2668 /*isImplicitlyDeclared=*/true); 2669 Destructor->setAccess(AS_public); 2670 Destructor->setImplicit(); 2671 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2672 if (S) 2673 PushOnScopeChains(Destructor, S, true); 2674 else 2675 ClassDecl->addDecl(Destructor); 2676 2677 // This could be uniqued if it ever proves significant. 2678 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2679 2680 AddOverriddenMethods(ClassDecl, Destructor); 2681 } 2682} 2683 2684void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2685 Decl *D = TemplateD.getAs<Decl>(); 2686 if (!D) 2687 return; 2688 2689 TemplateParameterList *Params = 0; 2690 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2691 Params = Template->getTemplateParameters(); 2692 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2693 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2694 Params = PartialSpec->getTemplateParameters(); 2695 else 2696 return; 2697 2698 for (TemplateParameterList::iterator Param = Params->begin(), 2699 ParamEnd = Params->end(); 2700 Param != ParamEnd; ++Param) { 2701 NamedDecl *Named = cast<NamedDecl>(*Param); 2702 if (Named->getDeclName()) { 2703 S->AddDecl(DeclPtrTy::make(Named)); 2704 IdResolver.AddDecl(Named); 2705 } 2706 } 2707} 2708 2709void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2710 if (!RecordD) return; 2711 AdjustDeclIfTemplate(RecordD); 2712 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2713 PushDeclContext(S, Record); 2714} 2715 2716void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2717 if (!RecordD) return; 2718 PopDeclContext(); 2719} 2720 2721/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2722/// parsing a top-level (non-nested) C++ class, and we are now 2723/// parsing those parts of the given Method declaration that could 2724/// not be parsed earlier (C++ [class.mem]p2), such as default 2725/// arguments. This action should enter the scope of the given 2726/// Method declaration as if we had just parsed the qualified method 2727/// name. However, it should not bring the parameters into scope; 2728/// that will be performed by ActOnDelayedCXXMethodParameter. 2729void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2730} 2731 2732/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2733/// C++ method declaration. We're (re-)introducing the given 2734/// function parameter into scope for use in parsing later parts of 2735/// the method declaration. For example, we could see an 2736/// ActOnParamDefaultArgument event for this parameter. 2737void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2738 if (!ParamD) 2739 return; 2740 2741 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2742 2743 // If this parameter has an unparsed default argument, clear it out 2744 // to make way for the parsed default argument. 2745 if (Param->hasUnparsedDefaultArg()) 2746 Param->setDefaultArg(0); 2747 2748 S->AddDecl(DeclPtrTy::make(Param)); 2749 if (Param->getDeclName()) 2750 IdResolver.AddDecl(Param); 2751} 2752 2753/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2754/// processing the delayed method declaration for Method. The method 2755/// declaration is now considered finished. There may be a separate 2756/// ActOnStartOfFunctionDef action later (not necessarily 2757/// immediately!) for this method, if it was also defined inside the 2758/// class body. 2759void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2760 if (!MethodD) 2761 return; 2762 2763 AdjustDeclIfTemplate(MethodD); 2764 2765 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2766 2767 // Now that we have our default arguments, check the constructor 2768 // again. It could produce additional diagnostics or affect whether 2769 // the class has implicitly-declared destructors, among other 2770 // things. 2771 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2772 CheckConstructor(Constructor); 2773 2774 // Check the default arguments, which we may have added. 2775 if (!Method->isInvalidDecl()) 2776 CheckCXXDefaultArguments(Method); 2777} 2778 2779/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2780/// the well-formedness of the constructor declarator @p D with type @p 2781/// R. If there are any errors in the declarator, this routine will 2782/// emit diagnostics and set the invalid bit to true. In any case, the type 2783/// will be updated to reflect a well-formed type for the constructor and 2784/// returned. 2785QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2786 FunctionDecl::StorageClass &SC) { 2787 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2788 2789 // C++ [class.ctor]p3: 2790 // A constructor shall not be virtual (10.3) or static (9.4). A 2791 // constructor can be invoked for a const, volatile or const 2792 // volatile object. A constructor shall not be declared const, 2793 // volatile, or const volatile (9.3.2). 2794 if (isVirtual) { 2795 if (!D.isInvalidType()) 2796 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2797 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2798 << SourceRange(D.getIdentifierLoc()); 2799 D.setInvalidType(); 2800 } 2801 if (SC == FunctionDecl::Static) { 2802 if (!D.isInvalidType()) 2803 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2804 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2805 << SourceRange(D.getIdentifierLoc()); 2806 D.setInvalidType(); 2807 SC = FunctionDecl::None; 2808 } 2809 2810 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2811 if (FTI.TypeQuals != 0) { 2812 if (FTI.TypeQuals & Qualifiers::Const) 2813 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2814 << "const" << SourceRange(D.getIdentifierLoc()); 2815 if (FTI.TypeQuals & Qualifiers::Volatile) 2816 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2817 << "volatile" << SourceRange(D.getIdentifierLoc()); 2818 if (FTI.TypeQuals & Qualifiers::Restrict) 2819 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2820 << "restrict" << SourceRange(D.getIdentifierLoc()); 2821 } 2822 2823 // Rebuild the function type "R" without any type qualifiers (in 2824 // case any of the errors above fired) and with "void" as the 2825 // return type, since constructors don't have return types. We 2826 // *always* have to do this, because GetTypeForDeclarator will 2827 // put in a result type of "int" when none was specified. 2828 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2829 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2830 Proto->getNumArgs(), 2831 Proto->isVariadic(), 0, 2832 Proto->hasExceptionSpec(), 2833 Proto->hasAnyExceptionSpec(), 2834 Proto->getNumExceptions(), 2835 Proto->exception_begin(), 2836 Proto->getExtInfo()); 2837} 2838 2839/// CheckConstructor - Checks a fully-formed constructor for 2840/// well-formedness, issuing any diagnostics required. Returns true if 2841/// the constructor declarator is invalid. 2842void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2843 CXXRecordDecl *ClassDecl 2844 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2845 if (!ClassDecl) 2846 return Constructor->setInvalidDecl(); 2847 2848 // C++ [class.copy]p3: 2849 // A declaration of a constructor for a class X is ill-formed if 2850 // its first parameter is of type (optionally cv-qualified) X and 2851 // either there are no other parameters or else all other 2852 // parameters have default arguments. 2853 if (!Constructor->isInvalidDecl() && 2854 ((Constructor->getNumParams() == 1) || 2855 (Constructor->getNumParams() > 1 && 2856 Constructor->getParamDecl(1)->hasDefaultArg())) && 2857 Constructor->getTemplateSpecializationKind() 2858 != TSK_ImplicitInstantiation) { 2859 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2860 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2861 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2862 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2863 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2864 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2865 2866 // FIXME: Rather that making the constructor invalid, we should endeavor 2867 // to fix the type. 2868 Constructor->setInvalidDecl(); 2869 } 2870 } 2871 2872 // Notify the class that we've added a constructor. In principle we 2873 // don't need to do this for out-of-line declarations; in practice 2874 // we only instantiate the most recent declaration of a method, so 2875 // we have to call this for everything but friends. 2876 if (!Constructor->getFriendObjectKind()) 2877 ClassDecl->addedConstructor(Context, Constructor); 2878} 2879 2880/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2881/// issuing any diagnostics required. Returns true on error. 2882bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2883 CXXRecordDecl *RD = Destructor->getParent(); 2884 2885 if (Destructor->isVirtual()) { 2886 SourceLocation Loc; 2887 2888 if (!Destructor->isImplicit()) 2889 Loc = Destructor->getLocation(); 2890 else 2891 Loc = RD->getLocation(); 2892 2893 // If we have a virtual destructor, look up the deallocation function 2894 FunctionDecl *OperatorDelete = 0; 2895 DeclarationName Name = 2896 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2897 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2898 return true; 2899 2900 Destructor->setOperatorDelete(OperatorDelete); 2901 } 2902 2903 return false; 2904} 2905 2906static inline bool 2907FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2908 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2909 FTI.ArgInfo[0].Param && 2910 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2911} 2912 2913/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2914/// the well-formednes of the destructor declarator @p D with type @p 2915/// R. If there are any errors in the declarator, this routine will 2916/// emit diagnostics and set the declarator to invalid. Even if this happens, 2917/// will be updated to reflect a well-formed type for the destructor and 2918/// returned. 2919QualType Sema::CheckDestructorDeclarator(Declarator &D, 2920 FunctionDecl::StorageClass& SC) { 2921 // C++ [class.dtor]p1: 2922 // [...] A typedef-name that names a class is a class-name 2923 // (7.1.3); however, a typedef-name that names a class shall not 2924 // be used as the identifier in the declarator for a destructor 2925 // declaration. 2926 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2927 if (isa<TypedefType>(DeclaratorType)) { 2928 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2929 << DeclaratorType; 2930 D.setInvalidType(); 2931 } 2932 2933 // C++ [class.dtor]p2: 2934 // A destructor is used to destroy objects of its class type. A 2935 // destructor takes no parameters, and no return type can be 2936 // specified for it (not even void). The address of a destructor 2937 // shall not be taken. A destructor shall not be static. A 2938 // destructor can be invoked for a const, volatile or const 2939 // volatile object. A destructor shall not be declared const, 2940 // volatile or const volatile (9.3.2). 2941 if (SC == FunctionDecl::Static) { 2942 if (!D.isInvalidType()) 2943 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2944 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2945 << SourceRange(D.getIdentifierLoc()); 2946 SC = FunctionDecl::None; 2947 D.setInvalidType(); 2948 } 2949 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2950 // Destructors don't have return types, but the parser will 2951 // happily parse something like: 2952 // 2953 // class X { 2954 // float ~X(); 2955 // }; 2956 // 2957 // The return type will be eliminated later. 2958 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2959 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2960 << SourceRange(D.getIdentifierLoc()); 2961 } 2962 2963 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2964 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2965 if (FTI.TypeQuals & Qualifiers::Const) 2966 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2967 << "const" << SourceRange(D.getIdentifierLoc()); 2968 if (FTI.TypeQuals & Qualifiers::Volatile) 2969 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2970 << "volatile" << SourceRange(D.getIdentifierLoc()); 2971 if (FTI.TypeQuals & Qualifiers::Restrict) 2972 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2973 << "restrict" << SourceRange(D.getIdentifierLoc()); 2974 D.setInvalidType(); 2975 } 2976 2977 // Make sure we don't have any parameters. 2978 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2979 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2980 2981 // Delete the parameters. 2982 FTI.freeArgs(); 2983 D.setInvalidType(); 2984 } 2985 2986 // Make sure the destructor isn't variadic. 2987 if (FTI.isVariadic) { 2988 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2989 D.setInvalidType(); 2990 } 2991 2992 // Rebuild the function type "R" without any type qualifiers or 2993 // parameters (in case any of the errors above fired) and with 2994 // "void" as the return type, since destructors don't have return 2995 // types. We *always* have to do this, because GetTypeForDeclarator 2996 // will put in a result type of "int" when none was specified. 2997 // FIXME: Exceptions! 2998 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2999 false, false, 0, 0, FunctionType::ExtInfo()); 3000} 3001 3002/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3003/// well-formednes of the conversion function declarator @p D with 3004/// type @p R. If there are any errors in the declarator, this routine 3005/// will emit diagnostics and return true. Otherwise, it will return 3006/// false. Either way, the type @p R will be updated to reflect a 3007/// well-formed type for the conversion operator. 3008void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3009 FunctionDecl::StorageClass& SC) { 3010 // C++ [class.conv.fct]p1: 3011 // Neither parameter types nor return type can be specified. The 3012 // type of a conversion function (8.3.5) is "function taking no 3013 // parameter returning conversion-type-id." 3014 if (SC == FunctionDecl::Static) { 3015 if (!D.isInvalidType()) 3016 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3017 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3018 << SourceRange(D.getIdentifierLoc()); 3019 D.setInvalidType(); 3020 SC = FunctionDecl::None; 3021 } 3022 3023 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3024 3025 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3026 // Conversion functions don't have return types, but the parser will 3027 // happily parse something like: 3028 // 3029 // class X { 3030 // float operator bool(); 3031 // }; 3032 // 3033 // The return type will be changed later anyway. 3034 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3035 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3036 << SourceRange(D.getIdentifierLoc()); 3037 D.setInvalidType(); 3038 } 3039 3040 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3041 3042 // Make sure we don't have any parameters. 3043 if (Proto->getNumArgs() > 0) { 3044 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3045 3046 // Delete the parameters. 3047 D.getTypeObject(0).Fun.freeArgs(); 3048 D.setInvalidType(); 3049 } else if (Proto->isVariadic()) { 3050 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3051 D.setInvalidType(); 3052 } 3053 3054 // Diagnose "&operator bool()" and other such nonsense. This 3055 // is actually a gcc extension which we don't support. 3056 if (Proto->getResultType() != ConvType) { 3057 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3058 << Proto->getResultType(); 3059 D.setInvalidType(); 3060 ConvType = Proto->getResultType(); 3061 } 3062 3063 // C++ [class.conv.fct]p4: 3064 // The conversion-type-id shall not represent a function type nor 3065 // an array type. 3066 if (ConvType->isArrayType()) { 3067 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3068 ConvType = Context.getPointerType(ConvType); 3069 D.setInvalidType(); 3070 } else if (ConvType->isFunctionType()) { 3071 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3072 ConvType = Context.getPointerType(ConvType); 3073 D.setInvalidType(); 3074 } 3075 3076 // Rebuild the function type "R" without any parameters (in case any 3077 // of the errors above fired) and with the conversion type as the 3078 // return type. 3079 if (D.isInvalidType()) { 3080 R = Context.getFunctionType(ConvType, 0, 0, false, 3081 Proto->getTypeQuals(), 3082 Proto->hasExceptionSpec(), 3083 Proto->hasAnyExceptionSpec(), 3084 Proto->getNumExceptions(), 3085 Proto->exception_begin(), 3086 Proto->getExtInfo()); 3087 } 3088 3089 // C++0x explicit conversion operators. 3090 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3091 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3092 diag::warn_explicit_conversion_functions) 3093 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3094} 3095 3096/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3097/// the declaration of the given C++ conversion function. This routine 3098/// is responsible for recording the conversion function in the C++ 3099/// class, if possible. 3100Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3101 assert(Conversion && "Expected to receive a conversion function declaration"); 3102 3103 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3104 3105 // Make sure we aren't redeclaring the conversion function. 3106 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3107 3108 // C++ [class.conv.fct]p1: 3109 // [...] A conversion function is never used to convert a 3110 // (possibly cv-qualified) object to the (possibly cv-qualified) 3111 // same object type (or a reference to it), to a (possibly 3112 // cv-qualified) base class of that type (or a reference to it), 3113 // or to (possibly cv-qualified) void. 3114 // FIXME: Suppress this warning if the conversion function ends up being a 3115 // virtual function that overrides a virtual function in a base class. 3116 QualType ClassType 3117 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3118 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3119 ConvType = ConvTypeRef->getPointeeType(); 3120 if (ConvType->isRecordType()) { 3121 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3122 if (ConvType == ClassType) 3123 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3124 << ClassType; 3125 else if (IsDerivedFrom(ClassType, ConvType)) 3126 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3127 << ClassType << ConvType; 3128 } else if (ConvType->isVoidType()) { 3129 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3130 << ClassType << ConvType; 3131 } 3132 3133 if (Conversion->getPrimaryTemplate()) { 3134 // ignore specializations 3135 } else if (Conversion->getPreviousDeclaration()) { 3136 if (FunctionTemplateDecl *ConversionTemplate 3137 = Conversion->getDescribedFunctionTemplate()) { 3138 if (ClassDecl->replaceConversion( 3139 ConversionTemplate->getPreviousDeclaration(), 3140 ConversionTemplate)) 3141 return DeclPtrTy::make(ConversionTemplate); 3142 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3143 Conversion)) 3144 return DeclPtrTy::make(Conversion); 3145 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3146 } else if (FunctionTemplateDecl *ConversionTemplate 3147 = Conversion->getDescribedFunctionTemplate()) 3148 ClassDecl->addConversionFunction(ConversionTemplate); 3149 else 3150 ClassDecl->addConversionFunction(Conversion); 3151 3152 return DeclPtrTy::make(Conversion); 3153} 3154 3155//===----------------------------------------------------------------------===// 3156// Namespace Handling 3157//===----------------------------------------------------------------------===// 3158 3159/// ActOnStartNamespaceDef - This is called at the start of a namespace 3160/// definition. 3161Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3162 SourceLocation IdentLoc, 3163 IdentifierInfo *II, 3164 SourceLocation LBrace, 3165 AttributeList *AttrList) { 3166 NamespaceDecl *Namespc = 3167 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3168 Namespc->setLBracLoc(LBrace); 3169 3170 Scope *DeclRegionScope = NamespcScope->getParent(); 3171 3172 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3173 3174 if (II) { 3175 // C++ [namespace.def]p2: 3176 // The identifier in an original-namespace-definition shall not have been 3177 // previously defined in the declarative region in which the 3178 // original-namespace-definition appears. The identifier in an 3179 // original-namespace-definition is the name of the namespace. Subsequently 3180 // in that declarative region, it is treated as an original-namespace-name. 3181 3182 NamedDecl *PrevDecl 3183 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3184 ForRedeclaration); 3185 3186 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3187 // This is an extended namespace definition. 3188 // Attach this namespace decl to the chain of extended namespace 3189 // definitions. 3190 OrigNS->setNextNamespace(Namespc); 3191 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3192 3193 // Remove the previous declaration from the scope. 3194 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3195 IdResolver.RemoveDecl(OrigNS); 3196 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3197 } 3198 } else if (PrevDecl) { 3199 // This is an invalid name redefinition. 3200 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3201 << Namespc->getDeclName(); 3202 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3203 Namespc->setInvalidDecl(); 3204 // Continue on to push Namespc as current DeclContext and return it. 3205 } else if (II->isStr("std") && 3206 CurContext->getLookupContext()->isTranslationUnit()) { 3207 // This is the first "real" definition of the namespace "std", so update 3208 // our cache of the "std" namespace to point at this definition. 3209 if (StdNamespace) { 3210 // We had already defined a dummy namespace "std". Link this new 3211 // namespace definition to the dummy namespace "std". 3212 StdNamespace->setNextNamespace(Namespc); 3213 StdNamespace->setLocation(IdentLoc); 3214 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3215 } 3216 3217 // Make our StdNamespace cache point at the first real definition of the 3218 // "std" namespace. 3219 StdNamespace = Namespc; 3220 } 3221 3222 PushOnScopeChains(Namespc, DeclRegionScope); 3223 } else { 3224 // Anonymous namespaces. 3225 assert(Namespc->isAnonymousNamespace()); 3226 3227 // Link the anonymous namespace into its parent. 3228 NamespaceDecl *PrevDecl; 3229 DeclContext *Parent = CurContext->getLookupContext(); 3230 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3231 PrevDecl = TU->getAnonymousNamespace(); 3232 TU->setAnonymousNamespace(Namespc); 3233 } else { 3234 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3235 PrevDecl = ND->getAnonymousNamespace(); 3236 ND->setAnonymousNamespace(Namespc); 3237 } 3238 3239 // Link the anonymous namespace with its previous declaration. 3240 if (PrevDecl) { 3241 assert(PrevDecl->isAnonymousNamespace()); 3242 assert(!PrevDecl->getNextNamespace()); 3243 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3244 PrevDecl->setNextNamespace(Namespc); 3245 } 3246 3247 CurContext->addDecl(Namespc); 3248 3249 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3250 // behaves as if it were replaced by 3251 // namespace unique { /* empty body */ } 3252 // using namespace unique; 3253 // namespace unique { namespace-body } 3254 // where all occurrences of 'unique' in a translation unit are 3255 // replaced by the same identifier and this identifier differs 3256 // from all other identifiers in the entire program. 3257 3258 // We just create the namespace with an empty name and then add an 3259 // implicit using declaration, just like the standard suggests. 3260 // 3261 // CodeGen enforces the "universally unique" aspect by giving all 3262 // declarations semantically contained within an anonymous 3263 // namespace internal linkage. 3264 3265 if (!PrevDecl) { 3266 UsingDirectiveDecl* UD 3267 = UsingDirectiveDecl::Create(Context, CurContext, 3268 /* 'using' */ LBrace, 3269 /* 'namespace' */ SourceLocation(), 3270 /* qualifier */ SourceRange(), 3271 /* NNS */ NULL, 3272 /* identifier */ SourceLocation(), 3273 Namespc, 3274 /* Ancestor */ CurContext); 3275 UD->setImplicit(); 3276 CurContext->addDecl(UD); 3277 } 3278 } 3279 3280 // Although we could have an invalid decl (i.e. the namespace name is a 3281 // redefinition), push it as current DeclContext and try to continue parsing. 3282 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3283 // for the namespace has the declarations that showed up in that particular 3284 // namespace definition. 3285 PushDeclContext(NamespcScope, Namespc); 3286 return DeclPtrTy::make(Namespc); 3287} 3288 3289/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3290/// is a namespace alias, returns the namespace it points to. 3291static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3292 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3293 return AD->getNamespace(); 3294 return dyn_cast_or_null<NamespaceDecl>(D); 3295} 3296 3297/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3298/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3299void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3300 Decl *Dcl = D.getAs<Decl>(); 3301 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3302 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3303 Namespc->setRBracLoc(RBrace); 3304 PopDeclContext(); 3305} 3306 3307Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3308 SourceLocation UsingLoc, 3309 SourceLocation NamespcLoc, 3310 CXXScopeSpec &SS, 3311 SourceLocation IdentLoc, 3312 IdentifierInfo *NamespcName, 3313 AttributeList *AttrList) { 3314 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3315 assert(NamespcName && "Invalid NamespcName."); 3316 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3317 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3318 3319 UsingDirectiveDecl *UDir = 0; 3320 3321 // Lookup namespace name. 3322 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3323 LookupParsedName(R, S, &SS); 3324 if (R.isAmbiguous()) 3325 return DeclPtrTy(); 3326 3327 if (!R.empty()) { 3328 NamedDecl *Named = R.getFoundDecl(); 3329 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3330 && "expected namespace decl"); 3331 // C++ [namespace.udir]p1: 3332 // A using-directive specifies that the names in the nominated 3333 // namespace can be used in the scope in which the 3334 // using-directive appears after the using-directive. During 3335 // unqualified name lookup (3.4.1), the names appear as if they 3336 // were declared in the nearest enclosing namespace which 3337 // contains both the using-directive and the nominated 3338 // namespace. [Note: in this context, "contains" means "contains 3339 // directly or indirectly". ] 3340 3341 // Find enclosing context containing both using-directive and 3342 // nominated namespace. 3343 NamespaceDecl *NS = getNamespaceDecl(Named); 3344 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3345 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3346 CommonAncestor = CommonAncestor->getParent(); 3347 3348 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3349 SS.getRange(), 3350 (NestedNameSpecifier *)SS.getScopeRep(), 3351 IdentLoc, Named, CommonAncestor); 3352 PushUsingDirective(S, UDir); 3353 } else { 3354 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3355 } 3356 3357 // FIXME: We ignore attributes for now. 3358 delete AttrList; 3359 return DeclPtrTy::make(UDir); 3360} 3361 3362void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3363 // If scope has associated entity, then using directive is at namespace 3364 // or translation unit scope. We add UsingDirectiveDecls, into 3365 // it's lookup structure. 3366 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3367 Ctx->addDecl(UDir); 3368 else 3369 // Otherwise it is block-sope. using-directives will affect lookup 3370 // only to the end of scope. 3371 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3372} 3373 3374 3375Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3376 AccessSpecifier AS, 3377 bool HasUsingKeyword, 3378 SourceLocation UsingLoc, 3379 CXXScopeSpec &SS, 3380 UnqualifiedId &Name, 3381 AttributeList *AttrList, 3382 bool IsTypeName, 3383 SourceLocation TypenameLoc) { 3384 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3385 3386 switch (Name.getKind()) { 3387 case UnqualifiedId::IK_Identifier: 3388 case UnqualifiedId::IK_OperatorFunctionId: 3389 case UnqualifiedId::IK_LiteralOperatorId: 3390 case UnqualifiedId::IK_ConversionFunctionId: 3391 break; 3392 3393 case UnqualifiedId::IK_ConstructorName: 3394 case UnqualifiedId::IK_ConstructorTemplateId: 3395 // C++0x inherited constructors. 3396 if (getLangOptions().CPlusPlus0x) break; 3397 3398 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3399 << SS.getRange(); 3400 return DeclPtrTy(); 3401 3402 case UnqualifiedId::IK_DestructorName: 3403 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3404 << SS.getRange(); 3405 return DeclPtrTy(); 3406 3407 case UnqualifiedId::IK_TemplateId: 3408 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3409 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3410 return DeclPtrTy(); 3411 } 3412 3413 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3414 if (!TargetName) 3415 return DeclPtrTy(); 3416 3417 // Warn about using declarations. 3418 // TODO: store that the declaration was written without 'using' and 3419 // talk about access decls instead of using decls in the 3420 // diagnostics. 3421 if (!HasUsingKeyword) { 3422 UsingLoc = Name.getSourceRange().getBegin(); 3423 3424 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3425 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3426 } 3427 3428 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3429 Name.getSourceRange().getBegin(), 3430 TargetName, AttrList, 3431 /* IsInstantiation */ false, 3432 IsTypeName, TypenameLoc); 3433 if (UD) 3434 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3435 3436 return DeclPtrTy::make(UD); 3437} 3438 3439/// Determines whether to create a using shadow decl for a particular 3440/// decl, given the set of decls existing prior to this using lookup. 3441bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3442 const LookupResult &Previous) { 3443 // Diagnose finding a decl which is not from a base class of the 3444 // current class. We do this now because there are cases where this 3445 // function will silently decide not to build a shadow decl, which 3446 // will pre-empt further diagnostics. 3447 // 3448 // We don't need to do this in C++0x because we do the check once on 3449 // the qualifier. 3450 // 3451 // FIXME: diagnose the following if we care enough: 3452 // struct A { int foo; }; 3453 // struct B : A { using A::foo; }; 3454 // template <class T> struct C : A {}; 3455 // template <class T> struct D : C<T> { using B::foo; } // <--- 3456 // This is invalid (during instantiation) in C++03 because B::foo 3457 // resolves to the using decl in B, which is not a base class of D<T>. 3458 // We can't diagnose it immediately because C<T> is an unknown 3459 // specialization. The UsingShadowDecl in D<T> then points directly 3460 // to A::foo, which will look well-formed when we instantiate. 3461 // The right solution is to not collapse the shadow-decl chain. 3462 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3463 DeclContext *OrigDC = Orig->getDeclContext(); 3464 3465 // Handle enums and anonymous structs. 3466 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3467 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3468 while (OrigRec->isAnonymousStructOrUnion()) 3469 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3470 3471 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3472 if (OrigDC == CurContext) { 3473 Diag(Using->getLocation(), 3474 diag::err_using_decl_nested_name_specifier_is_current_class) 3475 << Using->getNestedNameRange(); 3476 Diag(Orig->getLocation(), diag::note_using_decl_target); 3477 return true; 3478 } 3479 3480 Diag(Using->getNestedNameRange().getBegin(), 3481 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3482 << Using->getTargetNestedNameDecl() 3483 << cast<CXXRecordDecl>(CurContext) 3484 << Using->getNestedNameRange(); 3485 Diag(Orig->getLocation(), diag::note_using_decl_target); 3486 return true; 3487 } 3488 } 3489 3490 if (Previous.empty()) return false; 3491 3492 NamedDecl *Target = Orig; 3493 if (isa<UsingShadowDecl>(Target)) 3494 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3495 3496 // If the target happens to be one of the previous declarations, we 3497 // don't have a conflict. 3498 // 3499 // FIXME: but we might be increasing its access, in which case we 3500 // should redeclare it. 3501 NamedDecl *NonTag = 0, *Tag = 0; 3502 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3503 I != E; ++I) { 3504 NamedDecl *D = (*I)->getUnderlyingDecl(); 3505 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3506 return false; 3507 3508 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3509 } 3510 3511 if (Target->isFunctionOrFunctionTemplate()) { 3512 FunctionDecl *FD; 3513 if (isa<FunctionTemplateDecl>(Target)) 3514 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3515 else 3516 FD = cast<FunctionDecl>(Target); 3517 3518 NamedDecl *OldDecl = 0; 3519 switch (CheckOverload(FD, Previous, OldDecl)) { 3520 case Ovl_Overload: 3521 return false; 3522 3523 case Ovl_NonFunction: 3524 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3525 break; 3526 3527 // We found a decl with the exact signature. 3528 case Ovl_Match: 3529 if (isa<UsingShadowDecl>(OldDecl)) { 3530 // Silently ignore the possible conflict. 3531 return false; 3532 } 3533 3534 // If we're in a record, we want to hide the target, so we 3535 // return true (without a diagnostic) to tell the caller not to 3536 // build a shadow decl. 3537 if (CurContext->isRecord()) 3538 return true; 3539 3540 // If we're not in a record, this is an error. 3541 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3542 break; 3543 } 3544 3545 Diag(Target->getLocation(), diag::note_using_decl_target); 3546 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3547 return true; 3548 } 3549 3550 // Target is not a function. 3551 3552 if (isa<TagDecl>(Target)) { 3553 // No conflict between a tag and a non-tag. 3554 if (!Tag) return false; 3555 3556 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3557 Diag(Target->getLocation(), diag::note_using_decl_target); 3558 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3559 return true; 3560 } 3561 3562 // No conflict between a tag and a non-tag. 3563 if (!NonTag) return false; 3564 3565 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3566 Diag(Target->getLocation(), diag::note_using_decl_target); 3567 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3568 return true; 3569} 3570 3571/// Builds a shadow declaration corresponding to a 'using' declaration. 3572UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3573 UsingDecl *UD, 3574 NamedDecl *Orig) { 3575 3576 // If we resolved to another shadow declaration, just coalesce them. 3577 NamedDecl *Target = Orig; 3578 if (isa<UsingShadowDecl>(Target)) { 3579 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3580 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3581 } 3582 3583 UsingShadowDecl *Shadow 3584 = UsingShadowDecl::Create(Context, CurContext, 3585 UD->getLocation(), UD, Target); 3586 UD->addShadowDecl(Shadow); 3587 3588 if (S) 3589 PushOnScopeChains(Shadow, S); 3590 else 3591 CurContext->addDecl(Shadow); 3592 Shadow->setAccess(UD->getAccess()); 3593 3594 // Register it as a conversion if appropriate. 3595 if (Shadow->getDeclName().getNameKind() 3596 == DeclarationName::CXXConversionFunctionName) 3597 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3598 3599 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3600 Shadow->setInvalidDecl(); 3601 3602 return Shadow; 3603} 3604 3605/// Hides a using shadow declaration. This is required by the current 3606/// using-decl implementation when a resolvable using declaration in a 3607/// class is followed by a declaration which would hide or override 3608/// one or more of the using decl's targets; for example: 3609/// 3610/// struct Base { void foo(int); }; 3611/// struct Derived : Base { 3612/// using Base::foo; 3613/// void foo(int); 3614/// }; 3615/// 3616/// The governing language is C++03 [namespace.udecl]p12: 3617/// 3618/// When a using-declaration brings names from a base class into a 3619/// derived class scope, member functions in the derived class 3620/// override and/or hide member functions with the same name and 3621/// parameter types in a base class (rather than conflicting). 3622/// 3623/// There are two ways to implement this: 3624/// (1) optimistically create shadow decls when they're not hidden 3625/// by existing declarations, or 3626/// (2) don't create any shadow decls (or at least don't make them 3627/// visible) until we've fully parsed/instantiated the class. 3628/// The problem with (1) is that we might have to retroactively remove 3629/// a shadow decl, which requires several O(n) operations because the 3630/// decl structures are (very reasonably) not designed for removal. 3631/// (2) avoids this but is very fiddly and phase-dependent. 3632void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3633 if (Shadow->getDeclName().getNameKind() == 3634 DeclarationName::CXXConversionFunctionName) 3635 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3636 3637 // Remove it from the DeclContext... 3638 Shadow->getDeclContext()->removeDecl(Shadow); 3639 3640 // ...and the scope, if applicable... 3641 if (S) { 3642 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3643 IdResolver.RemoveDecl(Shadow); 3644 } 3645 3646 // ...and the using decl. 3647 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3648 3649 // TODO: complain somehow if Shadow was used. It shouldn't 3650 // be possible for this to happen, because...? 3651} 3652 3653/// Builds a using declaration. 3654/// 3655/// \param IsInstantiation - Whether this call arises from an 3656/// instantiation of an unresolved using declaration. We treat 3657/// the lookup differently for these declarations. 3658NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3659 SourceLocation UsingLoc, 3660 CXXScopeSpec &SS, 3661 SourceLocation IdentLoc, 3662 DeclarationName Name, 3663 AttributeList *AttrList, 3664 bool IsInstantiation, 3665 bool IsTypeName, 3666 SourceLocation TypenameLoc) { 3667 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3668 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3669 3670 // FIXME: We ignore attributes for now. 3671 delete AttrList; 3672 3673 if (SS.isEmpty()) { 3674 Diag(IdentLoc, diag::err_using_requires_qualname); 3675 return 0; 3676 } 3677 3678 // Do the redeclaration lookup in the current scope. 3679 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3680 ForRedeclaration); 3681 Previous.setHideTags(false); 3682 if (S) { 3683 LookupName(Previous, S); 3684 3685 // It is really dumb that we have to do this. 3686 LookupResult::Filter F = Previous.makeFilter(); 3687 while (F.hasNext()) { 3688 NamedDecl *D = F.next(); 3689 if (!isDeclInScope(D, CurContext, S)) 3690 F.erase(); 3691 } 3692 F.done(); 3693 } else { 3694 assert(IsInstantiation && "no scope in non-instantiation"); 3695 assert(CurContext->isRecord() && "scope not record in instantiation"); 3696 LookupQualifiedName(Previous, CurContext); 3697 } 3698 3699 NestedNameSpecifier *NNS = 3700 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3701 3702 // Check for invalid redeclarations. 3703 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3704 return 0; 3705 3706 // Check for bad qualifiers. 3707 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3708 return 0; 3709 3710 DeclContext *LookupContext = computeDeclContext(SS); 3711 NamedDecl *D; 3712 if (!LookupContext) { 3713 if (IsTypeName) { 3714 // FIXME: not all declaration name kinds are legal here 3715 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3716 UsingLoc, TypenameLoc, 3717 SS.getRange(), NNS, 3718 IdentLoc, Name); 3719 } else { 3720 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3721 UsingLoc, SS.getRange(), NNS, 3722 IdentLoc, Name); 3723 } 3724 } else { 3725 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3726 SS.getRange(), UsingLoc, NNS, Name, 3727 IsTypeName); 3728 } 3729 D->setAccess(AS); 3730 CurContext->addDecl(D); 3731 3732 if (!LookupContext) return D; 3733 UsingDecl *UD = cast<UsingDecl>(D); 3734 3735 if (RequireCompleteDeclContext(SS, LookupContext)) { 3736 UD->setInvalidDecl(); 3737 return UD; 3738 } 3739 3740 // Look up the target name. 3741 3742 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3743 3744 // Unlike most lookups, we don't always want to hide tag 3745 // declarations: tag names are visible through the using declaration 3746 // even if hidden by ordinary names, *except* in a dependent context 3747 // where it's important for the sanity of two-phase lookup. 3748 if (!IsInstantiation) 3749 R.setHideTags(false); 3750 3751 LookupQualifiedName(R, LookupContext); 3752 3753 if (R.empty()) { 3754 Diag(IdentLoc, diag::err_no_member) 3755 << Name << LookupContext << SS.getRange(); 3756 UD->setInvalidDecl(); 3757 return UD; 3758 } 3759 3760 if (R.isAmbiguous()) { 3761 UD->setInvalidDecl(); 3762 return UD; 3763 } 3764 3765 if (IsTypeName) { 3766 // If we asked for a typename and got a non-type decl, error out. 3767 if (!R.getAsSingle<TypeDecl>()) { 3768 Diag(IdentLoc, diag::err_using_typename_non_type); 3769 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3770 Diag((*I)->getUnderlyingDecl()->getLocation(), 3771 diag::note_using_decl_target); 3772 UD->setInvalidDecl(); 3773 return UD; 3774 } 3775 } else { 3776 // If we asked for a non-typename and we got a type, error out, 3777 // but only if this is an instantiation of an unresolved using 3778 // decl. Otherwise just silently find the type name. 3779 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3780 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3781 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3782 UD->setInvalidDecl(); 3783 return UD; 3784 } 3785 } 3786 3787 // C++0x N2914 [namespace.udecl]p6: 3788 // A using-declaration shall not name a namespace. 3789 if (R.getAsSingle<NamespaceDecl>()) { 3790 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3791 << SS.getRange(); 3792 UD->setInvalidDecl(); 3793 return UD; 3794 } 3795 3796 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3797 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3798 BuildUsingShadowDecl(S, UD, *I); 3799 } 3800 3801 return UD; 3802} 3803 3804/// Checks that the given using declaration is not an invalid 3805/// redeclaration. Note that this is checking only for the using decl 3806/// itself, not for any ill-formedness among the UsingShadowDecls. 3807bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3808 bool isTypeName, 3809 const CXXScopeSpec &SS, 3810 SourceLocation NameLoc, 3811 const LookupResult &Prev) { 3812 // C++03 [namespace.udecl]p8: 3813 // C++0x [namespace.udecl]p10: 3814 // A using-declaration is a declaration and can therefore be used 3815 // repeatedly where (and only where) multiple declarations are 3816 // allowed. 3817 // That's only in file contexts. 3818 if (CurContext->getLookupContext()->isFileContext()) 3819 return false; 3820 3821 NestedNameSpecifier *Qual 3822 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3823 3824 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3825 NamedDecl *D = *I; 3826 3827 bool DTypename; 3828 NestedNameSpecifier *DQual; 3829 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3830 DTypename = UD->isTypeName(); 3831 DQual = UD->getTargetNestedNameDecl(); 3832 } else if (UnresolvedUsingValueDecl *UD 3833 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3834 DTypename = false; 3835 DQual = UD->getTargetNestedNameSpecifier(); 3836 } else if (UnresolvedUsingTypenameDecl *UD 3837 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3838 DTypename = true; 3839 DQual = UD->getTargetNestedNameSpecifier(); 3840 } else continue; 3841 3842 // using decls differ if one says 'typename' and the other doesn't. 3843 // FIXME: non-dependent using decls? 3844 if (isTypeName != DTypename) continue; 3845 3846 // using decls differ if they name different scopes (but note that 3847 // template instantiation can cause this check to trigger when it 3848 // didn't before instantiation). 3849 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3850 Context.getCanonicalNestedNameSpecifier(DQual)) 3851 continue; 3852 3853 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3854 Diag(D->getLocation(), diag::note_using_decl) << 1; 3855 return true; 3856 } 3857 3858 return false; 3859} 3860 3861 3862/// Checks that the given nested-name qualifier used in a using decl 3863/// in the current context is appropriately related to the current 3864/// scope. If an error is found, diagnoses it and returns true. 3865bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3866 const CXXScopeSpec &SS, 3867 SourceLocation NameLoc) { 3868 DeclContext *NamedContext = computeDeclContext(SS); 3869 3870 if (!CurContext->isRecord()) { 3871 // C++03 [namespace.udecl]p3: 3872 // C++0x [namespace.udecl]p8: 3873 // A using-declaration for a class member shall be a member-declaration. 3874 3875 // If we weren't able to compute a valid scope, it must be a 3876 // dependent class scope. 3877 if (!NamedContext || NamedContext->isRecord()) { 3878 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3879 << SS.getRange(); 3880 return true; 3881 } 3882 3883 // Otherwise, everything is known to be fine. 3884 return false; 3885 } 3886 3887 // The current scope is a record. 3888 3889 // If the named context is dependent, we can't decide much. 3890 if (!NamedContext) { 3891 // FIXME: in C++0x, we can diagnose if we can prove that the 3892 // nested-name-specifier does not refer to a base class, which is 3893 // still possible in some cases. 3894 3895 // Otherwise we have to conservatively report that things might be 3896 // okay. 3897 return false; 3898 } 3899 3900 if (!NamedContext->isRecord()) { 3901 // Ideally this would point at the last name in the specifier, 3902 // but we don't have that level of source info. 3903 Diag(SS.getRange().getBegin(), 3904 diag::err_using_decl_nested_name_specifier_is_not_class) 3905 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3906 return true; 3907 } 3908 3909 if (getLangOptions().CPlusPlus0x) { 3910 // C++0x [namespace.udecl]p3: 3911 // In a using-declaration used as a member-declaration, the 3912 // nested-name-specifier shall name a base class of the class 3913 // being defined. 3914 3915 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3916 cast<CXXRecordDecl>(NamedContext))) { 3917 if (CurContext == NamedContext) { 3918 Diag(NameLoc, 3919 diag::err_using_decl_nested_name_specifier_is_current_class) 3920 << SS.getRange(); 3921 return true; 3922 } 3923 3924 Diag(SS.getRange().getBegin(), 3925 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3926 << (NestedNameSpecifier*) SS.getScopeRep() 3927 << cast<CXXRecordDecl>(CurContext) 3928 << SS.getRange(); 3929 return true; 3930 } 3931 3932 return false; 3933 } 3934 3935 // C++03 [namespace.udecl]p4: 3936 // A using-declaration used as a member-declaration shall refer 3937 // to a member of a base class of the class being defined [etc.]. 3938 3939 // Salient point: SS doesn't have to name a base class as long as 3940 // lookup only finds members from base classes. Therefore we can 3941 // diagnose here only if we can prove that that can't happen, 3942 // i.e. if the class hierarchies provably don't intersect. 3943 3944 // TODO: it would be nice if "definitely valid" results were cached 3945 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3946 // need to be repeated. 3947 3948 struct UserData { 3949 llvm::DenseSet<const CXXRecordDecl*> Bases; 3950 3951 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3952 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3953 Data->Bases.insert(Base); 3954 return true; 3955 } 3956 3957 bool hasDependentBases(const CXXRecordDecl *Class) { 3958 return !Class->forallBases(collect, this); 3959 } 3960 3961 /// Returns true if the base is dependent or is one of the 3962 /// accumulated base classes. 3963 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3964 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3965 return !Data->Bases.count(Base); 3966 } 3967 3968 bool mightShareBases(const CXXRecordDecl *Class) { 3969 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3970 } 3971 }; 3972 3973 UserData Data; 3974 3975 // Returns false if we find a dependent base. 3976 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3977 return false; 3978 3979 // Returns false if the class has a dependent base or if it or one 3980 // of its bases is present in the base set of the current context. 3981 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3982 return false; 3983 3984 Diag(SS.getRange().getBegin(), 3985 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3986 << (NestedNameSpecifier*) SS.getScopeRep() 3987 << cast<CXXRecordDecl>(CurContext) 3988 << SS.getRange(); 3989 3990 return true; 3991} 3992 3993Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3994 SourceLocation NamespaceLoc, 3995 SourceLocation AliasLoc, 3996 IdentifierInfo *Alias, 3997 CXXScopeSpec &SS, 3998 SourceLocation IdentLoc, 3999 IdentifierInfo *Ident) { 4000 4001 // Lookup the namespace name. 4002 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4003 LookupParsedName(R, S, &SS); 4004 4005 // Check if we have a previous declaration with the same name. 4006 if (NamedDecl *PrevDecl 4007 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4008 ForRedeclaration)) { 4009 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4010 // We already have an alias with the same name that points to the same 4011 // namespace, so don't create a new one. 4012 // FIXME: At some point, we'll want to create the (redundant) 4013 // declaration to maintain better source information. 4014 if (!R.isAmbiguous() && !R.empty() && 4015 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4016 return DeclPtrTy(); 4017 } 4018 4019 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4020 diag::err_redefinition_different_kind; 4021 Diag(AliasLoc, DiagID) << Alias; 4022 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4023 return DeclPtrTy(); 4024 } 4025 4026 if (R.isAmbiguous()) 4027 return DeclPtrTy(); 4028 4029 if (R.empty()) { 4030 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4031 return DeclPtrTy(); 4032 } 4033 4034 NamespaceAliasDecl *AliasDecl = 4035 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4036 Alias, SS.getRange(), 4037 (NestedNameSpecifier *)SS.getScopeRep(), 4038 IdentLoc, R.getFoundDecl()); 4039 4040 PushOnScopeChains(AliasDecl, S); 4041 return DeclPtrTy::make(AliasDecl); 4042} 4043 4044namespace { 4045 /// \brief Scoped object used to handle the state changes required in Sema 4046 /// to implicitly define the body of a C++ member function; 4047 class ImplicitlyDefinedFunctionScope { 4048 Sema &S; 4049 DeclContext *PreviousContext; 4050 4051 public: 4052 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4053 : S(S), PreviousContext(S.CurContext) 4054 { 4055 S.CurContext = Method; 4056 S.PushFunctionScope(); 4057 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4058 } 4059 4060 ~ImplicitlyDefinedFunctionScope() { 4061 S.PopExpressionEvaluationContext(); 4062 S.PopFunctionOrBlockScope(); 4063 S.CurContext = PreviousContext; 4064 } 4065 }; 4066} 4067 4068void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4069 CXXConstructorDecl *Constructor) { 4070 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4071 !Constructor->isUsed()) && 4072 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4073 4074 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4075 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4076 4077 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4078 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 4079 Diag(CurrentLocation, diag::note_member_synthesized_at) 4080 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4081 Constructor->setInvalidDecl(); 4082 } else { 4083 Constructor->setUsed(); 4084 } 4085} 4086 4087void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4088 CXXDestructorDecl *Destructor) { 4089 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4090 "DefineImplicitDestructor - call it for implicit default dtor"); 4091 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4092 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4093 4094 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4095 4096 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4097 Destructor->getParent()); 4098 4099 // FIXME: If CheckDestructor fails, we should emit a note about where the 4100 // implicit destructor was needed. 4101 if (CheckDestructor(Destructor)) { 4102 Diag(CurrentLocation, diag::note_member_synthesized_at) 4103 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4104 4105 Destructor->setInvalidDecl(); 4106 return; 4107 } 4108 4109 Destructor->setUsed(); 4110} 4111 4112void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4113 CXXMethodDecl *MethodDecl) { 4114 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 4115 MethodDecl->getOverloadedOperator() == OO_Equal && 4116 !MethodDecl->isUsed()) && 4117 "DefineImplicitCopyAssignment called for wrong function"); 4118 4119 CXXRecordDecl *ClassDecl 4120 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 4121 4122 ImplicitlyDefinedFunctionScope Scope(*this, MethodDecl); 4123 4124 // C++[class.copy] p12 4125 // Before the implicitly-declared copy assignment operator for a class is 4126 // implicitly defined, all implicitly-declared copy assignment operators 4127 // for its direct base classes and its nonstatic data members shall have 4128 // been implicitly defined. 4129 bool err = false; 4130 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4131 E = ClassDecl->bases_end(); Base != E; ++Base) { 4132 CXXRecordDecl *BaseClassDecl 4133 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4134 if (CXXMethodDecl *BaseAssignOpMethod = 4135 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4136 BaseClassDecl)) { 4137 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4138 BaseAssignOpMethod, 4139 PDiag(diag::err_access_assign_base) 4140 << Base->getType()); 4141 4142 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 4143 } 4144 } 4145 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4146 E = ClassDecl->field_end(); Field != E; ++Field) { 4147 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4148 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4149 FieldType = Array->getElementType(); 4150 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4151 CXXRecordDecl *FieldClassDecl 4152 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4153 if (CXXMethodDecl *FieldAssignOpMethod = 4154 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4155 FieldClassDecl)) { 4156 CheckDirectMemberAccess(Field->getLocation(), 4157 FieldAssignOpMethod, 4158 PDiag(diag::err_access_assign_field) 4159 << Field->getDeclName() << Field->getType()); 4160 4161 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 4162 } 4163 } else if (FieldType->isReferenceType()) { 4164 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4165 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4166 Diag(Field->getLocation(), diag::note_declared_at); 4167 Diag(CurrentLocation, diag::note_first_required_here); 4168 err = true; 4169 } else if (FieldType.isConstQualified()) { 4170 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4171 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4172 Diag(Field->getLocation(), diag::note_declared_at); 4173 Diag(CurrentLocation, diag::note_first_required_here); 4174 err = true; 4175 } 4176 } 4177 if (!err) 4178 MethodDecl->setUsed(); 4179} 4180 4181CXXMethodDecl * 4182Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4183 ParmVarDecl *ParmDecl, 4184 CXXRecordDecl *ClassDecl) { 4185 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4186 QualType RHSType(LHSType); 4187 // If class's assignment operator argument is const/volatile qualified, 4188 // look for operator = (const/volatile B&). Otherwise, look for 4189 // operator = (B&). 4190 RHSType = Context.getCVRQualifiedType(RHSType, 4191 ParmDecl->getType().getCVRQualifiers()); 4192 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4193 LHSType, 4194 SourceLocation())); 4195 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4196 RHSType, 4197 CurrentLocation)); 4198 Expr *Args[2] = { &*LHS, &*RHS }; 4199 OverloadCandidateSet CandidateSet(CurrentLocation); 4200 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4201 CandidateSet); 4202 OverloadCandidateSet::iterator Best; 4203 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4204 return cast<CXXMethodDecl>(Best->Function); 4205 assert(false && 4206 "getAssignOperatorMethod - copy assignment operator method not found"); 4207 return 0; 4208} 4209 4210void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4211 CXXConstructorDecl *CopyConstructor, 4212 unsigned TypeQuals) { 4213 assert((CopyConstructor->isImplicit() && 4214 CopyConstructor->isCopyConstructor(TypeQuals) && 4215 !CopyConstructor->isUsed()) && 4216 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4217 4218 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4219 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4220 4221 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4222 4223 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false)) { 4224 Diag(CurrentLocation, diag::note_member_synthesized_at) 4225 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4226 CopyConstructor->setInvalidDecl(); 4227 } else { 4228 CopyConstructor->setUsed(); 4229 } 4230 4231 // FIXME: Once SetBaseOrMemberInitializers can handle copy initialization of 4232 // fields, this code below should be removed. 4233 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4234 FieldEnd = ClassDecl->field_end(); 4235 Field != FieldEnd; ++Field) { 4236 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4237 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4238 FieldType = Array->getElementType(); 4239 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4240 CXXRecordDecl *FieldClassDecl 4241 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4242 if (CXXConstructorDecl *FieldCopyCtor = 4243 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4244 CheckDirectMemberAccess(Field->getLocation(), 4245 FieldCopyCtor, 4246 PDiag(diag::err_access_copy_field) 4247 << Field->getDeclName() << Field->getType()); 4248 4249 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4250 } 4251 } 4252 } 4253} 4254 4255Sema::OwningExprResult 4256Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4257 CXXConstructorDecl *Constructor, 4258 MultiExprArg ExprArgs, 4259 bool RequiresZeroInit, 4260 bool BaseInitialization) { 4261 bool Elidable = false; 4262 4263 // C++0x [class.copy]p34: 4264 // When certain criteria are met, an implementation is allowed to 4265 // omit the copy/move construction of a class object, even if the 4266 // copy/move constructor and/or destructor for the object have 4267 // side effects. [...] 4268 // - when a temporary class object that has not been bound to a 4269 // reference (12.2) would be copied/moved to a class object 4270 // with the same cv-unqualified type, the copy/move operation 4271 // can be omitted by constructing the temporary object 4272 // directly into the target of the omitted copy/move 4273 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4274 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4275 Elidable = SubExpr->isTemporaryObject() && 4276 Context.hasSameUnqualifiedType(SubExpr->getType(), 4277 Context.getTypeDeclType(Constructor->getParent())); 4278 } 4279 4280 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4281 Elidable, move(ExprArgs), RequiresZeroInit, 4282 BaseInitialization); 4283} 4284 4285/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4286/// including handling of its default argument expressions. 4287Sema::OwningExprResult 4288Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4289 CXXConstructorDecl *Constructor, bool Elidable, 4290 MultiExprArg ExprArgs, 4291 bool RequiresZeroInit, 4292 bool BaseInitialization) { 4293 unsigned NumExprs = ExprArgs.size(); 4294 Expr **Exprs = (Expr **)ExprArgs.release(); 4295 4296 MarkDeclarationReferenced(ConstructLoc, Constructor); 4297 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4298 Constructor, Elidable, Exprs, NumExprs, 4299 RequiresZeroInit, BaseInitialization)); 4300} 4301 4302bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4303 CXXConstructorDecl *Constructor, 4304 MultiExprArg Exprs) { 4305 OwningExprResult TempResult = 4306 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4307 move(Exprs)); 4308 if (TempResult.isInvalid()) 4309 return true; 4310 4311 Expr *Temp = TempResult.takeAs<Expr>(); 4312 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4313 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4314 VD->setInit(Temp); 4315 4316 return false; 4317} 4318 4319void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4320 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4321 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4322 !ClassDecl->hasTrivialDestructor()) { 4323 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4324 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4325 CheckDestructorAccess(VD->getLocation(), Destructor, 4326 PDiag(diag::err_access_dtor_var) 4327 << VD->getDeclName() 4328 << VD->getType()); 4329 } 4330} 4331 4332/// AddCXXDirectInitializerToDecl - This action is called immediately after 4333/// ActOnDeclarator, when a C++ direct initializer is present. 4334/// e.g: "int x(1);" 4335void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4336 SourceLocation LParenLoc, 4337 MultiExprArg Exprs, 4338 SourceLocation *CommaLocs, 4339 SourceLocation RParenLoc) { 4340 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4341 Decl *RealDecl = Dcl.getAs<Decl>(); 4342 4343 // If there is no declaration, there was an error parsing it. Just ignore 4344 // the initializer. 4345 if (RealDecl == 0) 4346 return; 4347 4348 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4349 if (!VDecl) { 4350 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4351 RealDecl->setInvalidDecl(); 4352 return; 4353 } 4354 4355 // We will represent direct-initialization similarly to copy-initialization: 4356 // int x(1); -as-> int x = 1; 4357 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4358 // 4359 // Clients that want to distinguish between the two forms, can check for 4360 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4361 // A major benefit is that clients that don't particularly care about which 4362 // exactly form was it (like the CodeGen) can handle both cases without 4363 // special case code. 4364 4365 // C++ 8.5p11: 4366 // The form of initialization (using parentheses or '=') is generally 4367 // insignificant, but does matter when the entity being initialized has a 4368 // class type. 4369 QualType DeclInitType = VDecl->getType(); 4370 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4371 DeclInitType = Context.getBaseElementType(Array); 4372 4373 if (!VDecl->getType()->isDependentType() && 4374 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4375 diag::err_typecheck_decl_incomplete_type)) { 4376 VDecl->setInvalidDecl(); 4377 return; 4378 } 4379 4380 // The variable can not have an abstract class type. 4381 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4382 diag::err_abstract_type_in_decl, 4383 AbstractVariableType)) 4384 VDecl->setInvalidDecl(); 4385 4386 const VarDecl *Def; 4387 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4388 Diag(VDecl->getLocation(), diag::err_redefinition) 4389 << VDecl->getDeclName(); 4390 Diag(Def->getLocation(), diag::note_previous_definition); 4391 VDecl->setInvalidDecl(); 4392 return; 4393 } 4394 4395 // If either the declaration has a dependent type or if any of the 4396 // expressions is type-dependent, we represent the initialization 4397 // via a ParenListExpr for later use during template instantiation. 4398 if (VDecl->getType()->isDependentType() || 4399 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4400 // Let clients know that initialization was done with a direct initializer. 4401 VDecl->setCXXDirectInitializer(true); 4402 4403 // Store the initialization expressions as a ParenListExpr. 4404 unsigned NumExprs = Exprs.size(); 4405 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4406 (Expr **)Exprs.release(), 4407 NumExprs, RParenLoc)); 4408 return; 4409 } 4410 4411 // Capture the variable that is being initialized and the style of 4412 // initialization. 4413 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4414 4415 // FIXME: Poor source location information. 4416 InitializationKind Kind 4417 = InitializationKind::CreateDirect(VDecl->getLocation(), 4418 LParenLoc, RParenLoc); 4419 4420 InitializationSequence InitSeq(*this, Entity, Kind, 4421 (Expr**)Exprs.get(), Exprs.size()); 4422 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4423 if (Result.isInvalid()) { 4424 VDecl->setInvalidDecl(); 4425 return; 4426 } 4427 4428 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4429 VDecl->setInit(Result.takeAs<Expr>()); 4430 VDecl->setCXXDirectInitializer(true); 4431 4432 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4433 FinalizeVarWithDestructor(VDecl, Record); 4434} 4435 4436/// \brief Given a constructor and the set of arguments provided for the 4437/// constructor, convert the arguments and add any required default arguments 4438/// to form a proper call to this constructor. 4439/// 4440/// \returns true if an error occurred, false otherwise. 4441bool 4442Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4443 MultiExprArg ArgsPtr, 4444 SourceLocation Loc, 4445 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4446 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4447 unsigned NumArgs = ArgsPtr.size(); 4448 Expr **Args = (Expr **)ArgsPtr.get(); 4449 4450 const FunctionProtoType *Proto 4451 = Constructor->getType()->getAs<FunctionProtoType>(); 4452 assert(Proto && "Constructor without a prototype?"); 4453 unsigned NumArgsInProto = Proto->getNumArgs(); 4454 4455 // If too few arguments are available, we'll fill in the rest with defaults. 4456 if (NumArgs < NumArgsInProto) 4457 ConvertedArgs.reserve(NumArgsInProto); 4458 else 4459 ConvertedArgs.reserve(NumArgs); 4460 4461 VariadicCallType CallType = 4462 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4463 llvm::SmallVector<Expr *, 8> AllArgs; 4464 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4465 Proto, 0, Args, NumArgs, AllArgs, 4466 CallType); 4467 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4468 ConvertedArgs.push_back(AllArgs[i]); 4469 return Invalid; 4470} 4471 4472static inline bool 4473CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4474 const FunctionDecl *FnDecl) { 4475 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4476 if (isa<NamespaceDecl>(DC)) { 4477 return SemaRef.Diag(FnDecl->getLocation(), 4478 diag::err_operator_new_delete_declared_in_namespace) 4479 << FnDecl->getDeclName(); 4480 } 4481 4482 if (isa<TranslationUnitDecl>(DC) && 4483 FnDecl->getStorageClass() == FunctionDecl::Static) { 4484 return SemaRef.Diag(FnDecl->getLocation(), 4485 diag::err_operator_new_delete_declared_static) 4486 << FnDecl->getDeclName(); 4487 } 4488 4489 return false; 4490} 4491 4492static inline bool 4493CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4494 CanQualType ExpectedResultType, 4495 CanQualType ExpectedFirstParamType, 4496 unsigned DependentParamTypeDiag, 4497 unsigned InvalidParamTypeDiag) { 4498 QualType ResultType = 4499 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4500 4501 // Check that the result type is not dependent. 4502 if (ResultType->isDependentType()) 4503 return SemaRef.Diag(FnDecl->getLocation(), 4504 diag::err_operator_new_delete_dependent_result_type) 4505 << FnDecl->getDeclName() << ExpectedResultType; 4506 4507 // Check that the result type is what we expect. 4508 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4509 return SemaRef.Diag(FnDecl->getLocation(), 4510 diag::err_operator_new_delete_invalid_result_type) 4511 << FnDecl->getDeclName() << ExpectedResultType; 4512 4513 // A function template must have at least 2 parameters. 4514 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4515 return SemaRef.Diag(FnDecl->getLocation(), 4516 diag::err_operator_new_delete_template_too_few_parameters) 4517 << FnDecl->getDeclName(); 4518 4519 // The function decl must have at least 1 parameter. 4520 if (FnDecl->getNumParams() == 0) 4521 return SemaRef.Diag(FnDecl->getLocation(), 4522 diag::err_operator_new_delete_too_few_parameters) 4523 << FnDecl->getDeclName(); 4524 4525 // Check the the first parameter type is not dependent. 4526 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4527 if (FirstParamType->isDependentType()) 4528 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4529 << FnDecl->getDeclName() << ExpectedFirstParamType; 4530 4531 // Check that the first parameter type is what we expect. 4532 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4533 ExpectedFirstParamType) 4534 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4535 << FnDecl->getDeclName() << ExpectedFirstParamType; 4536 4537 return false; 4538} 4539 4540static bool 4541CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4542 // C++ [basic.stc.dynamic.allocation]p1: 4543 // A program is ill-formed if an allocation function is declared in a 4544 // namespace scope other than global scope or declared static in global 4545 // scope. 4546 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4547 return true; 4548 4549 CanQualType SizeTy = 4550 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4551 4552 // C++ [basic.stc.dynamic.allocation]p1: 4553 // The return type shall be void*. The first parameter shall have type 4554 // std::size_t. 4555 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4556 SizeTy, 4557 diag::err_operator_new_dependent_param_type, 4558 diag::err_operator_new_param_type)) 4559 return true; 4560 4561 // C++ [basic.stc.dynamic.allocation]p1: 4562 // The first parameter shall not have an associated default argument. 4563 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4564 return SemaRef.Diag(FnDecl->getLocation(), 4565 diag::err_operator_new_default_arg) 4566 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4567 4568 return false; 4569} 4570 4571static bool 4572CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4573 // C++ [basic.stc.dynamic.deallocation]p1: 4574 // A program is ill-formed if deallocation functions are declared in a 4575 // namespace scope other than global scope or declared static in global 4576 // scope. 4577 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4578 return true; 4579 4580 // C++ [basic.stc.dynamic.deallocation]p2: 4581 // Each deallocation function shall return void and its first parameter 4582 // shall be void*. 4583 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4584 SemaRef.Context.VoidPtrTy, 4585 diag::err_operator_delete_dependent_param_type, 4586 diag::err_operator_delete_param_type)) 4587 return true; 4588 4589 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4590 if (FirstParamType->isDependentType()) 4591 return SemaRef.Diag(FnDecl->getLocation(), 4592 diag::err_operator_delete_dependent_param_type) 4593 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4594 4595 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4596 SemaRef.Context.VoidPtrTy) 4597 return SemaRef.Diag(FnDecl->getLocation(), 4598 diag::err_operator_delete_param_type) 4599 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4600 4601 return false; 4602} 4603 4604/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4605/// of this overloaded operator is well-formed. If so, returns false; 4606/// otherwise, emits appropriate diagnostics and returns true. 4607bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4608 assert(FnDecl && FnDecl->isOverloadedOperator() && 4609 "Expected an overloaded operator declaration"); 4610 4611 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4612 4613 // C++ [over.oper]p5: 4614 // The allocation and deallocation functions, operator new, 4615 // operator new[], operator delete and operator delete[], are 4616 // described completely in 3.7.3. The attributes and restrictions 4617 // found in the rest of this subclause do not apply to them unless 4618 // explicitly stated in 3.7.3. 4619 if (Op == OO_Delete || Op == OO_Array_Delete) 4620 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4621 4622 if (Op == OO_New || Op == OO_Array_New) 4623 return CheckOperatorNewDeclaration(*this, FnDecl); 4624 4625 // C++ [over.oper]p6: 4626 // An operator function shall either be a non-static member 4627 // function or be a non-member function and have at least one 4628 // parameter whose type is a class, a reference to a class, an 4629 // enumeration, or a reference to an enumeration. 4630 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4631 if (MethodDecl->isStatic()) 4632 return Diag(FnDecl->getLocation(), 4633 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4634 } else { 4635 bool ClassOrEnumParam = false; 4636 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4637 ParamEnd = FnDecl->param_end(); 4638 Param != ParamEnd; ++Param) { 4639 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4640 if (ParamType->isDependentType() || ParamType->isRecordType() || 4641 ParamType->isEnumeralType()) { 4642 ClassOrEnumParam = true; 4643 break; 4644 } 4645 } 4646 4647 if (!ClassOrEnumParam) 4648 return Diag(FnDecl->getLocation(), 4649 diag::err_operator_overload_needs_class_or_enum) 4650 << FnDecl->getDeclName(); 4651 } 4652 4653 // C++ [over.oper]p8: 4654 // An operator function cannot have default arguments (8.3.6), 4655 // except where explicitly stated below. 4656 // 4657 // Only the function-call operator allows default arguments 4658 // (C++ [over.call]p1). 4659 if (Op != OO_Call) { 4660 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4661 Param != FnDecl->param_end(); ++Param) { 4662 if ((*Param)->hasDefaultArg()) 4663 return Diag((*Param)->getLocation(), 4664 diag::err_operator_overload_default_arg) 4665 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4666 } 4667 } 4668 4669 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4670 { false, false, false } 4671#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4672 , { Unary, Binary, MemberOnly } 4673#include "clang/Basic/OperatorKinds.def" 4674 }; 4675 4676 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4677 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4678 bool MustBeMemberOperator = OperatorUses[Op][2]; 4679 4680 // C++ [over.oper]p8: 4681 // [...] Operator functions cannot have more or fewer parameters 4682 // than the number required for the corresponding operator, as 4683 // described in the rest of this subclause. 4684 unsigned NumParams = FnDecl->getNumParams() 4685 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4686 if (Op != OO_Call && 4687 ((NumParams == 1 && !CanBeUnaryOperator) || 4688 (NumParams == 2 && !CanBeBinaryOperator) || 4689 (NumParams < 1) || (NumParams > 2))) { 4690 // We have the wrong number of parameters. 4691 unsigned ErrorKind; 4692 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4693 ErrorKind = 2; // 2 -> unary or binary. 4694 } else if (CanBeUnaryOperator) { 4695 ErrorKind = 0; // 0 -> unary 4696 } else { 4697 assert(CanBeBinaryOperator && 4698 "All non-call overloaded operators are unary or binary!"); 4699 ErrorKind = 1; // 1 -> binary 4700 } 4701 4702 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4703 << FnDecl->getDeclName() << NumParams << ErrorKind; 4704 } 4705 4706 // Overloaded operators other than operator() cannot be variadic. 4707 if (Op != OO_Call && 4708 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4709 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4710 << FnDecl->getDeclName(); 4711 } 4712 4713 // Some operators must be non-static member functions. 4714 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4715 return Diag(FnDecl->getLocation(), 4716 diag::err_operator_overload_must_be_member) 4717 << FnDecl->getDeclName(); 4718 } 4719 4720 // C++ [over.inc]p1: 4721 // The user-defined function called operator++ implements the 4722 // prefix and postfix ++ operator. If this function is a member 4723 // function with no parameters, or a non-member function with one 4724 // parameter of class or enumeration type, it defines the prefix 4725 // increment operator ++ for objects of that type. If the function 4726 // is a member function with one parameter (which shall be of type 4727 // int) or a non-member function with two parameters (the second 4728 // of which shall be of type int), it defines the postfix 4729 // increment operator ++ for objects of that type. 4730 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4731 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4732 bool ParamIsInt = false; 4733 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4734 ParamIsInt = BT->getKind() == BuiltinType::Int; 4735 4736 if (!ParamIsInt) 4737 return Diag(LastParam->getLocation(), 4738 diag::err_operator_overload_post_incdec_must_be_int) 4739 << LastParam->getType() << (Op == OO_MinusMinus); 4740 } 4741 4742 // Notify the class if it got an assignment operator. 4743 if (Op == OO_Equal) { 4744 // Would have returned earlier otherwise. 4745 assert(isa<CXXMethodDecl>(FnDecl) && 4746 "Overloaded = not member, but not filtered."); 4747 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4748 Method->getParent()->addedAssignmentOperator(Context, Method); 4749 } 4750 4751 return false; 4752} 4753 4754/// CheckLiteralOperatorDeclaration - Check whether the declaration 4755/// of this literal operator function is well-formed. If so, returns 4756/// false; otherwise, emits appropriate diagnostics and returns true. 4757bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4758 DeclContext *DC = FnDecl->getDeclContext(); 4759 Decl::Kind Kind = DC->getDeclKind(); 4760 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4761 Kind != Decl::LinkageSpec) { 4762 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4763 << FnDecl->getDeclName(); 4764 return true; 4765 } 4766 4767 bool Valid = false; 4768 4769 // template <char...> type operator "" name() is the only valid template 4770 // signature, and the only valid signature with no parameters. 4771 if (FnDecl->param_size() == 0) { 4772 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4773 // Must have only one template parameter 4774 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4775 if (Params->size() == 1) { 4776 NonTypeTemplateParmDecl *PmDecl = 4777 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4778 4779 // The template parameter must be a char parameter pack. 4780 // FIXME: This test will always fail because non-type parameter packs 4781 // have not been implemented. 4782 if (PmDecl && PmDecl->isTemplateParameterPack() && 4783 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4784 Valid = true; 4785 } 4786 } 4787 } else { 4788 // Check the first parameter 4789 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4790 4791 QualType T = (*Param)->getType(); 4792 4793 // unsigned long long int, long double, and any character type are allowed 4794 // as the only parameters. 4795 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4796 Context.hasSameType(T, Context.LongDoubleTy) || 4797 Context.hasSameType(T, Context.CharTy) || 4798 Context.hasSameType(T, Context.WCharTy) || 4799 Context.hasSameType(T, Context.Char16Ty) || 4800 Context.hasSameType(T, Context.Char32Ty)) { 4801 if (++Param == FnDecl->param_end()) 4802 Valid = true; 4803 goto FinishedParams; 4804 } 4805 4806 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4807 const PointerType *PT = T->getAs<PointerType>(); 4808 if (!PT) 4809 goto FinishedParams; 4810 T = PT->getPointeeType(); 4811 if (!T.isConstQualified()) 4812 goto FinishedParams; 4813 T = T.getUnqualifiedType(); 4814 4815 // Move on to the second parameter; 4816 ++Param; 4817 4818 // If there is no second parameter, the first must be a const char * 4819 if (Param == FnDecl->param_end()) { 4820 if (Context.hasSameType(T, Context.CharTy)) 4821 Valid = true; 4822 goto FinishedParams; 4823 } 4824 4825 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4826 // are allowed as the first parameter to a two-parameter function 4827 if (!(Context.hasSameType(T, Context.CharTy) || 4828 Context.hasSameType(T, Context.WCharTy) || 4829 Context.hasSameType(T, Context.Char16Ty) || 4830 Context.hasSameType(T, Context.Char32Ty))) 4831 goto FinishedParams; 4832 4833 // The second and final parameter must be an std::size_t 4834 T = (*Param)->getType().getUnqualifiedType(); 4835 if (Context.hasSameType(T, Context.getSizeType()) && 4836 ++Param == FnDecl->param_end()) 4837 Valid = true; 4838 } 4839 4840 // FIXME: This diagnostic is absolutely terrible. 4841FinishedParams: 4842 if (!Valid) { 4843 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4844 << FnDecl->getDeclName(); 4845 return true; 4846 } 4847 4848 return false; 4849} 4850 4851/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4852/// linkage specification, including the language and (if present) 4853/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4854/// the location of the language string literal, which is provided 4855/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4856/// the '{' brace. Otherwise, this linkage specification does not 4857/// have any braces. 4858Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4859 SourceLocation ExternLoc, 4860 SourceLocation LangLoc, 4861 const char *Lang, 4862 unsigned StrSize, 4863 SourceLocation LBraceLoc) { 4864 LinkageSpecDecl::LanguageIDs Language; 4865 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4866 Language = LinkageSpecDecl::lang_c; 4867 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4868 Language = LinkageSpecDecl::lang_cxx; 4869 else { 4870 Diag(LangLoc, diag::err_bad_language); 4871 return DeclPtrTy(); 4872 } 4873 4874 // FIXME: Add all the various semantics of linkage specifications 4875 4876 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4877 LangLoc, Language, 4878 LBraceLoc.isValid()); 4879 CurContext->addDecl(D); 4880 PushDeclContext(S, D); 4881 return DeclPtrTy::make(D); 4882} 4883 4884/// ActOnFinishLinkageSpecification - Completely the definition of 4885/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4886/// valid, it's the position of the closing '}' brace in a linkage 4887/// specification that uses braces. 4888Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4889 DeclPtrTy LinkageSpec, 4890 SourceLocation RBraceLoc) { 4891 if (LinkageSpec) 4892 PopDeclContext(); 4893 return LinkageSpec; 4894} 4895 4896/// \brief Perform semantic analysis for the variable declaration that 4897/// occurs within a C++ catch clause, returning the newly-created 4898/// variable. 4899VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4900 TypeSourceInfo *TInfo, 4901 IdentifierInfo *Name, 4902 SourceLocation Loc, 4903 SourceRange Range) { 4904 bool Invalid = false; 4905 4906 // Arrays and functions decay. 4907 if (ExDeclType->isArrayType()) 4908 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4909 else if (ExDeclType->isFunctionType()) 4910 ExDeclType = Context.getPointerType(ExDeclType); 4911 4912 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4913 // The exception-declaration shall not denote a pointer or reference to an 4914 // incomplete type, other than [cv] void*. 4915 // N2844 forbids rvalue references. 4916 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4917 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4918 Invalid = true; 4919 } 4920 4921 // GCC allows catching pointers and references to incomplete types 4922 // as an extension; so do we, but we warn by default. 4923 4924 QualType BaseType = ExDeclType; 4925 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4926 unsigned DK = diag::err_catch_incomplete; 4927 bool IncompleteCatchIsInvalid = true; 4928 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4929 BaseType = Ptr->getPointeeType(); 4930 Mode = 1; 4931 DK = diag::ext_catch_incomplete_ptr; 4932 IncompleteCatchIsInvalid = false; 4933 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4934 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4935 BaseType = Ref->getPointeeType(); 4936 Mode = 2; 4937 DK = diag::ext_catch_incomplete_ref; 4938 IncompleteCatchIsInvalid = false; 4939 } 4940 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4941 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4942 IncompleteCatchIsInvalid) 4943 Invalid = true; 4944 4945 if (!Invalid && !ExDeclType->isDependentType() && 4946 RequireNonAbstractType(Loc, ExDeclType, 4947 diag::err_abstract_type_in_decl, 4948 AbstractVariableType)) 4949 Invalid = true; 4950 4951 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4952 Name, ExDeclType, TInfo, VarDecl::None, 4953 VarDecl::None); 4954 4955 if (!Invalid) { 4956 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4957 // C++ [except.handle]p16: 4958 // The object declared in an exception-declaration or, if the 4959 // exception-declaration does not specify a name, a temporary (12.2) is 4960 // copy-initialized (8.5) from the exception object. [...] 4961 // The object is destroyed when the handler exits, after the destruction 4962 // of any automatic objects initialized within the handler. 4963 // 4964 // We just pretend to initialize the object with itself, then make sure 4965 // it can be destroyed later. 4966 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4967 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4968 Loc, ExDeclType, 0); 4969 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4970 SourceLocation()); 4971 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4972 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4973 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4974 if (Result.isInvalid()) 4975 Invalid = true; 4976 else 4977 FinalizeVarWithDestructor(ExDecl, RecordTy); 4978 } 4979 } 4980 4981 if (Invalid) 4982 ExDecl->setInvalidDecl(); 4983 4984 return ExDecl; 4985} 4986 4987/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4988/// handler. 4989Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4990 TypeSourceInfo *TInfo = 0; 4991 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4992 4993 bool Invalid = D.isInvalidType(); 4994 IdentifierInfo *II = D.getIdentifier(); 4995 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4996 LookupOrdinaryName, 4997 ForRedeclaration)) { 4998 // The scope should be freshly made just for us. There is just no way 4999 // it contains any previous declaration. 5000 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5001 if (PrevDecl->isTemplateParameter()) { 5002 // Maybe we will complain about the shadowed template parameter. 5003 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5004 } 5005 } 5006 5007 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5008 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5009 << D.getCXXScopeSpec().getRange(); 5010 Invalid = true; 5011 } 5012 5013 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5014 D.getIdentifier(), 5015 D.getIdentifierLoc(), 5016 D.getDeclSpec().getSourceRange()); 5017 5018 if (Invalid) 5019 ExDecl->setInvalidDecl(); 5020 5021 // Add the exception declaration into this scope. 5022 if (II) 5023 PushOnScopeChains(ExDecl, S); 5024 else 5025 CurContext->addDecl(ExDecl); 5026 5027 ProcessDeclAttributes(S, ExDecl, D); 5028 return DeclPtrTy::make(ExDecl); 5029} 5030 5031Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5032 ExprArg assertexpr, 5033 ExprArg assertmessageexpr) { 5034 Expr *AssertExpr = (Expr *)assertexpr.get(); 5035 StringLiteral *AssertMessage = 5036 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5037 5038 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5039 llvm::APSInt Value(32); 5040 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5041 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5042 AssertExpr->getSourceRange(); 5043 return DeclPtrTy(); 5044 } 5045 5046 if (Value == 0) { 5047 Diag(AssertLoc, diag::err_static_assert_failed) 5048 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5049 } 5050 } 5051 5052 assertexpr.release(); 5053 assertmessageexpr.release(); 5054 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5055 AssertExpr, AssertMessage); 5056 5057 CurContext->addDecl(Decl); 5058 return DeclPtrTy::make(Decl); 5059} 5060 5061/// \brief Perform semantic analysis of the given friend type declaration. 5062/// 5063/// \returns A friend declaration that. 5064FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5065 TypeSourceInfo *TSInfo) { 5066 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5067 5068 QualType T = TSInfo->getType(); 5069 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5070 5071 if (!getLangOptions().CPlusPlus0x) { 5072 // C++03 [class.friend]p2: 5073 // An elaborated-type-specifier shall be used in a friend declaration 5074 // for a class.* 5075 // 5076 // * The class-key of the elaborated-type-specifier is required. 5077 if (!ActiveTemplateInstantiations.empty()) { 5078 // Do not complain about the form of friend template types during 5079 // template instantiation; we will already have complained when the 5080 // template was declared. 5081 } else if (!T->isElaboratedTypeSpecifier()) { 5082 // If we evaluated the type to a record type, suggest putting 5083 // a tag in front. 5084 if (const RecordType *RT = T->getAs<RecordType>()) { 5085 RecordDecl *RD = RT->getDecl(); 5086 5087 std::string InsertionText = std::string(" ") + RD->getKindName(); 5088 5089 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5090 << (unsigned) RD->getTagKind() 5091 << T 5092 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5093 InsertionText); 5094 } else { 5095 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5096 << T 5097 << SourceRange(FriendLoc, TypeRange.getEnd()); 5098 } 5099 } else if (T->getAs<EnumType>()) { 5100 Diag(FriendLoc, diag::ext_enum_friend) 5101 << T 5102 << SourceRange(FriendLoc, TypeRange.getEnd()); 5103 } 5104 } 5105 5106 // C++0x [class.friend]p3: 5107 // If the type specifier in a friend declaration designates a (possibly 5108 // cv-qualified) class type, that class is declared as a friend; otherwise, 5109 // the friend declaration is ignored. 5110 5111 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5112 // in [class.friend]p3 that we do not implement. 5113 5114 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5115} 5116 5117/// Handle a friend type declaration. This works in tandem with 5118/// ActOnTag. 5119/// 5120/// Notes on friend class templates: 5121/// 5122/// We generally treat friend class declarations as if they were 5123/// declaring a class. So, for example, the elaborated type specifier 5124/// in a friend declaration is required to obey the restrictions of a 5125/// class-head (i.e. no typedefs in the scope chain), template 5126/// parameters are required to match up with simple template-ids, &c. 5127/// However, unlike when declaring a template specialization, it's 5128/// okay to refer to a template specialization without an empty 5129/// template parameter declaration, e.g. 5130/// friend class A<T>::B<unsigned>; 5131/// We permit this as a special case; if there are any template 5132/// parameters present at all, require proper matching, i.e. 5133/// template <> template <class T> friend class A<int>::B; 5134Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5135 MultiTemplateParamsArg TempParams) { 5136 SourceLocation Loc = DS.getSourceRange().getBegin(); 5137 5138 assert(DS.isFriendSpecified()); 5139 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5140 5141 // Try to convert the decl specifier to a type. This works for 5142 // friend templates because ActOnTag never produces a ClassTemplateDecl 5143 // for a TUK_Friend. 5144 Declarator TheDeclarator(DS, Declarator::MemberContext); 5145 TypeSourceInfo *TSI; 5146 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5147 if (TheDeclarator.isInvalidType()) 5148 return DeclPtrTy(); 5149 5150 if (!TSI) 5151 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5152 5153 // This is definitely an error in C++98. It's probably meant to 5154 // be forbidden in C++0x, too, but the specification is just 5155 // poorly written. 5156 // 5157 // The problem is with declarations like the following: 5158 // template <T> friend A<T>::foo; 5159 // where deciding whether a class C is a friend or not now hinges 5160 // on whether there exists an instantiation of A that causes 5161 // 'foo' to equal C. There are restrictions on class-heads 5162 // (which we declare (by fiat) elaborated friend declarations to 5163 // be) that makes this tractable. 5164 // 5165 // FIXME: handle "template <> friend class A<T>;", which 5166 // is possibly well-formed? Who even knows? 5167 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5168 Diag(Loc, diag::err_tagless_friend_type_template) 5169 << DS.getSourceRange(); 5170 return DeclPtrTy(); 5171 } 5172 5173 // C++98 [class.friend]p1: A friend of a class is a function 5174 // or class that is not a member of the class . . . 5175 // This is fixed in DR77, which just barely didn't make the C++03 5176 // deadline. It's also a very silly restriction that seriously 5177 // affects inner classes and which nobody else seems to implement; 5178 // thus we never diagnose it, not even in -pedantic. 5179 // 5180 // But note that we could warn about it: it's always useless to 5181 // friend one of your own members (it's not, however, worthless to 5182 // friend a member of an arbitrary specialization of your template). 5183 5184 Decl *D; 5185 if (unsigned NumTempParamLists = TempParams.size()) 5186 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5187 NumTempParamLists, 5188 (TemplateParameterList**) TempParams.release(), 5189 TSI, 5190 DS.getFriendSpecLoc()); 5191 else 5192 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5193 5194 if (!D) 5195 return DeclPtrTy(); 5196 5197 D->setAccess(AS_public); 5198 CurContext->addDecl(D); 5199 5200 return DeclPtrTy::make(D); 5201} 5202 5203Sema::DeclPtrTy 5204Sema::ActOnFriendFunctionDecl(Scope *S, 5205 Declarator &D, 5206 bool IsDefinition, 5207 MultiTemplateParamsArg TemplateParams) { 5208 const DeclSpec &DS = D.getDeclSpec(); 5209 5210 assert(DS.isFriendSpecified()); 5211 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5212 5213 SourceLocation Loc = D.getIdentifierLoc(); 5214 TypeSourceInfo *TInfo = 0; 5215 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5216 5217 // C++ [class.friend]p1 5218 // A friend of a class is a function or class.... 5219 // Note that this sees through typedefs, which is intended. 5220 // It *doesn't* see through dependent types, which is correct 5221 // according to [temp.arg.type]p3: 5222 // If a declaration acquires a function type through a 5223 // type dependent on a template-parameter and this causes 5224 // a declaration that does not use the syntactic form of a 5225 // function declarator to have a function type, the program 5226 // is ill-formed. 5227 if (!T->isFunctionType()) { 5228 Diag(Loc, diag::err_unexpected_friend); 5229 5230 // It might be worthwhile to try to recover by creating an 5231 // appropriate declaration. 5232 return DeclPtrTy(); 5233 } 5234 5235 // C++ [namespace.memdef]p3 5236 // - If a friend declaration in a non-local class first declares a 5237 // class or function, the friend class or function is a member 5238 // of the innermost enclosing namespace. 5239 // - The name of the friend is not found by simple name lookup 5240 // until a matching declaration is provided in that namespace 5241 // scope (either before or after the class declaration granting 5242 // friendship). 5243 // - If a friend function is called, its name may be found by the 5244 // name lookup that considers functions from namespaces and 5245 // classes associated with the types of the function arguments. 5246 // - When looking for a prior declaration of a class or a function 5247 // declared as a friend, scopes outside the innermost enclosing 5248 // namespace scope are not considered. 5249 5250 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5251 DeclarationName Name = GetNameForDeclarator(D); 5252 assert(Name); 5253 5254 // The context we found the declaration in, or in which we should 5255 // create the declaration. 5256 DeclContext *DC; 5257 5258 // FIXME: handle local classes 5259 5260 // Recover from invalid scope qualifiers as if they just weren't there. 5261 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5262 ForRedeclaration); 5263 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5264 DC = computeDeclContext(ScopeQual); 5265 5266 // FIXME: handle dependent contexts 5267 if (!DC) return DeclPtrTy(); 5268 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5269 5270 LookupQualifiedName(Previous, DC); 5271 5272 // If searching in that context implicitly found a declaration in 5273 // a different context, treat it like it wasn't found at all. 5274 // TODO: better diagnostics for this case. Suggesting the right 5275 // qualified scope would be nice... 5276 // FIXME: getRepresentativeDecl() is not right here at all 5277 if (Previous.empty() || 5278 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5279 D.setInvalidType(); 5280 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5281 return DeclPtrTy(); 5282 } 5283 5284 // C++ [class.friend]p1: A friend of a class is a function or 5285 // class that is not a member of the class . . . 5286 if (DC->Equals(CurContext)) 5287 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5288 5289 // Otherwise walk out to the nearest namespace scope looking for matches. 5290 } else { 5291 // TODO: handle local class contexts. 5292 5293 DC = CurContext; 5294 while (true) { 5295 // Skip class contexts. If someone can cite chapter and verse 5296 // for this behavior, that would be nice --- it's what GCC and 5297 // EDG do, and it seems like a reasonable intent, but the spec 5298 // really only says that checks for unqualified existing 5299 // declarations should stop at the nearest enclosing namespace, 5300 // not that they should only consider the nearest enclosing 5301 // namespace. 5302 while (DC->isRecord()) 5303 DC = DC->getParent(); 5304 5305 LookupQualifiedName(Previous, DC); 5306 5307 // TODO: decide what we think about using declarations. 5308 if (!Previous.empty()) 5309 break; 5310 5311 if (DC->isFileContext()) break; 5312 DC = DC->getParent(); 5313 } 5314 5315 // C++ [class.friend]p1: A friend of a class is a function or 5316 // class that is not a member of the class . . . 5317 // C++0x changes this for both friend types and functions. 5318 // Most C++ 98 compilers do seem to give an error here, so 5319 // we do, too. 5320 if (!Previous.empty() && DC->Equals(CurContext) 5321 && !getLangOptions().CPlusPlus0x) 5322 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5323 } 5324 5325 if (DC->isFileContext()) { 5326 // This implies that it has to be an operator or function. 5327 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5328 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5329 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5330 Diag(Loc, diag::err_introducing_special_friend) << 5331 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5332 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5333 return DeclPtrTy(); 5334 } 5335 } 5336 5337 bool Redeclaration = false; 5338 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5339 move(TemplateParams), 5340 IsDefinition, 5341 Redeclaration); 5342 if (!ND) return DeclPtrTy(); 5343 5344 assert(ND->getDeclContext() == DC); 5345 assert(ND->getLexicalDeclContext() == CurContext); 5346 5347 // Add the function declaration to the appropriate lookup tables, 5348 // adjusting the redeclarations list as necessary. We don't 5349 // want to do this yet if the friending class is dependent. 5350 // 5351 // Also update the scope-based lookup if the target context's 5352 // lookup context is in lexical scope. 5353 if (!CurContext->isDependentContext()) { 5354 DC = DC->getLookupContext(); 5355 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5356 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5357 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5358 } 5359 5360 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5361 D.getIdentifierLoc(), ND, 5362 DS.getFriendSpecLoc()); 5363 FrD->setAccess(AS_public); 5364 CurContext->addDecl(FrD); 5365 5366 return DeclPtrTy::make(ND); 5367} 5368 5369void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5370 AdjustDeclIfTemplate(dcl); 5371 5372 Decl *Dcl = dcl.getAs<Decl>(); 5373 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5374 if (!Fn) { 5375 Diag(DelLoc, diag::err_deleted_non_function); 5376 return; 5377 } 5378 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5379 Diag(DelLoc, diag::err_deleted_decl_not_first); 5380 Diag(Prev->getLocation(), diag::note_previous_declaration); 5381 // If the declaration wasn't the first, we delete the function anyway for 5382 // recovery. 5383 } 5384 Fn->setDeleted(); 5385} 5386 5387static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5388 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5389 ++CI) { 5390 Stmt *SubStmt = *CI; 5391 if (!SubStmt) 5392 continue; 5393 if (isa<ReturnStmt>(SubStmt)) 5394 Self.Diag(SubStmt->getSourceRange().getBegin(), 5395 diag::err_return_in_constructor_handler); 5396 if (!isa<Expr>(SubStmt)) 5397 SearchForReturnInStmt(Self, SubStmt); 5398 } 5399} 5400 5401void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5402 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5403 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5404 SearchForReturnInStmt(*this, Handler); 5405 } 5406} 5407 5408bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5409 const CXXMethodDecl *Old) { 5410 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5411 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5412 5413 if (Context.hasSameType(NewTy, OldTy) || 5414 NewTy->isDependentType() || OldTy->isDependentType()) 5415 return false; 5416 5417 // Check if the return types are covariant 5418 QualType NewClassTy, OldClassTy; 5419 5420 /// Both types must be pointers or references to classes. 5421 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5422 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5423 NewClassTy = NewPT->getPointeeType(); 5424 OldClassTy = OldPT->getPointeeType(); 5425 } 5426 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5427 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5428 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5429 NewClassTy = NewRT->getPointeeType(); 5430 OldClassTy = OldRT->getPointeeType(); 5431 } 5432 } 5433 } 5434 5435 // The return types aren't either both pointers or references to a class type. 5436 if (NewClassTy.isNull()) { 5437 Diag(New->getLocation(), 5438 diag::err_different_return_type_for_overriding_virtual_function) 5439 << New->getDeclName() << NewTy << OldTy; 5440 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5441 5442 return true; 5443 } 5444 5445 // C++ [class.virtual]p6: 5446 // If the return type of D::f differs from the return type of B::f, the 5447 // class type in the return type of D::f shall be complete at the point of 5448 // declaration of D::f or shall be the class type D. 5449 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5450 if (!RT->isBeingDefined() && 5451 RequireCompleteType(New->getLocation(), NewClassTy, 5452 PDiag(diag::err_covariant_return_incomplete) 5453 << New->getDeclName())) 5454 return true; 5455 } 5456 5457 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5458 // Check if the new class derives from the old class. 5459 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5460 Diag(New->getLocation(), 5461 diag::err_covariant_return_not_derived) 5462 << New->getDeclName() << NewTy << OldTy; 5463 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5464 return true; 5465 } 5466 5467 // Check if we the conversion from derived to base is valid. 5468 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5469 diag::err_covariant_return_inaccessible_base, 5470 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5471 // FIXME: Should this point to the return type? 5472 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5473 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5474 return true; 5475 } 5476 } 5477 5478 // The qualifiers of the return types must be the same. 5479 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5480 Diag(New->getLocation(), 5481 diag::err_covariant_return_type_different_qualifications) 5482 << New->getDeclName() << NewTy << OldTy; 5483 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5484 return true; 5485 }; 5486 5487 5488 // The new class type must have the same or less qualifiers as the old type. 5489 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5490 Diag(New->getLocation(), 5491 diag::err_covariant_return_type_class_type_more_qualified) 5492 << New->getDeclName() << NewTy << OldTy; 5493 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5494 return true; 5495 }; 5496 5497 return false; 5498} 5499 5500bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5501 const CXXMethodDecl *Old) 5502{ 5503 if (Old->hasAttr<FinalAttr>()) { 5504 Diag(New->getLocation(), diag::err_final_function_overridden) 5505 << New->getDeclName(); 5506 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5507 return true; 5508 } 5509 5510 return false; 5511} 5512 5513/// \brief Mark the given method pure. 5514/// 5515/// \param Method the method to be marked pure. 5516/// 5517/// \param InitRange the source range that covers the "0" initializer. 5518bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5519 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5520 Method->setPure(); 5521 5522 // A class is abstract if at least one function is pure virtual. 5523 Method->getParent()->setAbstract(true); 5524 return false; 5525 } 5526 5527 if (!Method->isInvalidDecl()) 5528 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5529 << Method->getDeclName() << InitRange; 5530 return true; 5531} 5532 5533/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5534/// an initializer for the out-of-line declaration 'Dcl'. The scope 5535/// is a fresh scope pushed for just this purpose. 5536/// 5537/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5538/// static data member of class X, names should be looked up in the scope of 5539/// class X. 5540void Sema::ActOnCXXEnterDeclInitializer(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 // We should only get called for declarations with scope specifiers, like: 5546 // int foo::bar; 5547 assert(D->isOutOfLine()); 5548 EnterDeclaratorContext(S, D->getDeclContext()); 5549} 5550 5551/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5552/// initializer for the out-of-line declaration 'Dcl'. 5553void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5554 // If there is no declaration, there was an error parsing it. 5555 Decl *D = Dcl.getAs<Decl>(); 5556 if (D == 0) return; 5557 5558 assert(D->isOutOfLine()); 5559 ExitDeclaratorContext(S); 5560} 5561 5562/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5563/// C++ if/switch/while/for statement. 5564/// e.g: "if (int x = f()) {...}" 5565Action::DeclResult 5566Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5567 // C++ 6.4p2: 5568 // The declarator shall not specify a function or an array. 5569 // The type-specifier-seq shall not contain typedef and shall not declare a 5570 // new class or enumeration. 5571 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5572 "Parser allowed 'typedef' as storage class of condition decl."); 5573 5574 TypeSourceInfo *TInfo = 0; 5575 TagDecl *OwnedTag = 0; 5576 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5577 5578 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5579 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5580 // would be created and CXXConditionDeclExpr wants a VarDecl. 5581 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5582 << D.getSourceRange(); 5583 return DeclResult(); 5584 } else if (OwnedTag && OwnedTag->isDefinition()) { 5585 // The type-specifier-seq shall not declare a new class or enumeration. 5586 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5587 } 5588 5589 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5590 if (!Dcl) 5591 return DeclResult(); 5592 5593 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5594 VD->setDeclaredInCondition(true); 5595 return Dcl; 5596} 5597 5598static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5599 // Ignore dependent types. 5600 if (MD->isDependentContext()) 5601 return false; 5602 5603 // Ignore declarations that are not definitions. 5604 if (!MD->isThisDeclarationADefinition()) 5605 return false; 5606 5607 CXXRecordDecl *RD = MD->getParent(); 5608 5609 // Ignore classes without a vtable. 5610 if (!RD->isDynamicClass()) 5611 return false; 5612 5613 switch (MD->getParent()->getTemplateSpecializationKind()) { 5614 case TSK_Undeclared: 5615 case TSK_ExplicitSpecialization: 5616 // Classes that aren't instantiations of templates don't need their 5617 // virtual methods marked until we see the definition of the key 5618 // function. 5619 break; 5620 5621 case TSK_ImplicitInstantiation: 5622 // This is a constructor of a class template; mark all of the virtual 5623 // members as referenced to ensure that they get instantiatied. 5624 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5625 return true; 5626 break; 5627 5628 case TSK_ExplicitInstantiationDeclaration: 5629 return false; 5630 5631 case TSK_ExplicitInstantiationDefinition: 5632 // This is method of a explicit instantiation; mark all of the virtual 5633 // members as referenced to ensure that they get instantiatied. 5634 return true; 5635 } 5636 5637 // Consider only out-of-line definitions of member functions. When we see 5638 // an inline definition, it's too early to compute the key function. 5639 if (!MD->isOutOfLine()) 5640 return false; 5641 5642 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5643 5644 // If there is no key function, we will need a copy of the vtable. 5645 if (!KeyFunction) 5646 return true; 5647 5648 // If this is the key function, we need to mark virtual members. 5649 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5650 return true; 5651 5652 return false; 5653} 5654 5655void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5656 CXXMethodDecl *MD) { 5657 CXXRecordDecl *RD = MD->getParent(); 5658 5659 // We will need to mark all of the virtual members as referenced to build the 5660 // vtable. 5661 if (!needsVTable(MD, Context)) 5662 return; 5663 5664 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5665 if (kind == TSK_ImplicitInstantiation) 5666 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5667 else 5668 MarkVirtualMembersReferenced(Loc, RD); 5669} 5670 5671bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5672 if (ClassesWithUnmarkedVirtualMembers.empty()) 5673 return false; 5674 5675 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5676 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5677 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5678 ClassesWithUnmarkedVirtualMembers.pop_back(); 5679 MarkVirtualMembersReferenced(Loc, RD); 5680 } 5681 5682 return true; 5683} 5684 5685void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5686 const CXXRecordDecl *RD) { 5687 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5688 e = RD->method_end(); i != e; ++i) { 5689 CXXMethodDecl *MD = *i; 5690 5691 // C++ [basic.def.odr]p2: 5692 // [...] A virtual member function is used if it is not pure. [...] 5693 if (MD->isVirtual() && !MD->isPure()) 5694 MarkDeclarationReferenced(Loc, MD); 5695 } 5696 5697 // Only classes that have virtual bases need a VTT. 5698 if (RD->getNumVBases() == 0) 5699 return; 5700 5701 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5702 e = RD->bases_end(); i != e; ++i) { 5703 const CXXRecordDecl *Base = 5704 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5705 if (i->isVirtual()) 5706 continue; 5707 if (Base->getNumVBases() == 0) 5708 continue; 5709 MarkVirtualMembersReferenced(Loc, Base); 5710 } 5711} 5712 5713/// SetIvarInitializers - This routine builds initialization ASTs for the 5714/// Objective-C implementation whose ivars need be initialized. 5715void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 5716 if (!getLangOptions().CPlusPlus) 5717 return; 5718 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 5719 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 5720 CollectIvarsToConstructOrDestruct(OID, ivars); 5721 if (ivars.empty()) 5722 return; 5723 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 5724 for (unsigned i = 0; i < ivars.size(); i++) { 5725 FieldDecl *Field = ivars[i]; 5726 CXXBaseOrMemberInitializer *Member; 5727 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 5728 InitializationKind InitKind = 5729 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 5730 5731 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 5732 Sema::OwningExprResult MemberInit = 5733 InitSeq.Perform(*this, InitEntity, InitKind, 5734 Sema::MultiExprArg(*this, 0, 0)); 5735 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 5736 // Note, MemberInit could actually come back empty if no initialization 5737 // is required (e.g., because it would call a trivial default constructor) 5738 if (!MemberInit.get() || MemberInit.isInvalid()) 5739 continue; 5740 5741 Member = 5742 new (Context) CXXBaseOrMemberInitializer(Context, 5743 Field, SourceLocation(), 5744 SourceLocation(), 5745 MemberInit.takeAs<Expr>(), 5746 SourceLocation()); 5747 AllToInit.push_back(Member); 5748 } 5749 ObjCImplementation->setIvarInitializers(Context, 5750 AllToInit.data(), AllToInit.size()); 5751 } 5752} 5753