SemaDeclCXX.cpp revision 9f71a8f4c7a182a5236da9e747d57cc1d1bd24c2
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 "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check that the default argument is well-formed 181 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 182 if (DefaultArgChecker.Visit(DefaultArg)) { 183 Param->setInvalidDecl(); 184 return; 185 } 186 187 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 188} 189 190/// ActOnParamUnparsedDefaultArgument - We've seen a default 191/// argument for a function parameter, but we can't parse it yet 192/// because we're inside a class definition. Note that this default 193/// argument will be parsed later. 194void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 195 SourceLocation EqualLoc, 196 SourceLocation ArgLoc) { 197 if (!param) 198 return; 199 200 ParmVarDecl *Param = cast<ParmVarDecl>(param); 201 if (Param) 202 Param->setUnparsedDefaultArg(); 203 204 UnparsedDefaultArgLocs[Param] = ArgLoc; 205} 206 207/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 208/// the default argument for the parameter param failed. 209void Sema::ActOnParamDefaultArgumentError(Decl *param) { 210 if (!param) 211 return; 212 213 ParmVarDecl *Param = cast<ParmVarDecl>(param); 214 215 Param->setInvalidDecl(); 216 217 UnparsedDefaultArgLocs.erase(Param); 218} 219 220/// CheckExtraCXXDefaultArguments - Check for any extra default 221/// arguments in the declarator, which is not a function declaration 222/// or definition and therefore is not permitted to have default 223/// arguments. This routine should be invoked for every declarator 224/// that is not a function declaration or definition. 225void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 226 // C++ [dcl.fct.default]p3 227 // A default argument expression shall be specified only in the 228 // parameter-declaration-clause of a function declaration or in a 229 // template-parameter (14.1). It shall not be specified for a 230 // parameter pack. If it is specified in a 231 // parameter-declaration-clause, it shall not occur within a 232 // declarator or abstract-declarator of a parameter-declaration. 233 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 234 DeclaratorChunk &chunk = D.getTypeObject(i); 235 if (chunk.Kind == DeclaratorChunk::Function) { 236 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 237 ParmVarDecl *Param = 238 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 239 if (Param->hasUnparsedDefaultArg()) { 240 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 241 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 242 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 243 delete Toks; 244 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 245 } else if (Param->getDefaultArg()) { 246 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 247 << Param->getDefaultArg()->getSourceRange(); 248 Param->setDefaultArg(0); 249 } 250 } 251 } 252 } 253} 254 255// MergeCXXFunctionDecl - Merge two declarations of the same C++ 256// function, once we already know that they have the same 257// type. Subroutine of MergeFunctionDecl. Returns true if there was an 258// error, false otherwise. 259bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 260 bool Invalid = false; 261 262 // C++ [dcl.fct.default]p4: 263 // For non-template functions, default arguments can be added in 264 // later declarations of a function in the same 265 // scope. Declarations in different scopes have completely 266 // distinct sets of default arguments. That is, declarations in 267 // inner scopes do not acquire default arguments from 268 // declarations in outer scopes, and vice versa. In a given 269 // function declaration, all parameters subsequent to a 270 // parameter with a default argument shall have default 271 // arguments supplied in this or previous declarations. A 272 // default argument shall not be redefined by a later 273 // declaration (not even to the same value). 274 // 275 // C++ [dcl.fct.default]p6: 276 // Except for member functions of class templates, the default arguments 277 // in a member function definition that appears outside of the class 278 // definition are added to the set of default arguments provided by the 279 // member function declaration in the class definition. 280 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 281 ParmVarDecl *OldParam = Old->getParamDecl(p); 282 ParmVarDecl *NewParam = New->getParamDecl(p); 283 284 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 285 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 286 // hint here. Alternatively, we could walk the type-source information 287 // for NewParam to find the last source location in the type... but it 288 // isn't worth the effort right now. This is the kind of test case that 289 // is hard to get right: 290 291 // int f(int); 292 // void g(int (*fp)(int) = f); 293 // void g(int (*fp)(int) = &f); 294 Diag(NewParam->getLocation(), 295 diag::err_param_default_argument_redefinition) 296 << NewParam->getDefaultArgRange(); 297 298 // Look for the function declaration where the default argument was 299 // actually written, which may be a declaration prior to Old. 300 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 301 Older; Older = Older->getPreviousDeclaration()) { 302 if (!Older->getParamDecl(p)->hasDefaultArg()) 303 break; 304 305 OldParam = Older->getParamDecl(p); 306 } 307 308 Diag(OldParam->getLocation(), diag::note_previous_definition) 309 << OldParam->getDefaultArgRange(); 310 Invalid = true; 311 } else if (OldParam->hasDefaultArg()) { 312 // Merge the old default argument into the new parameter. 313 // It's important to use getInit() here; getDefaultArg() 314 // strips off any top-level ExprWithCleanups. 315 NewParam->setHasInheritedDefaultArg(); 316 if (OldParam->hasUninstantiatedDefaultArg()) 317 NewParam->setUninstantiatedDefaultArg( 318 OldParam->getUninstantiatedDefaultArg()); 319 else 320 NewParam->setDefaultArg(OldParam->getInit()); 321 } else if (NewParam->hasDefaultArg()) { 322 if (New->getDescribedFunctionTemplate()) { 323 // Paragraph 4, quoted above, only applies to non-template functions. 324 Diag(NewParam->getLocation(), 325 diag::err_param_default_argument_template_redecl) 326 << NewParam->getDefaultArgRange(); 327 Diag(Old->getLocation(), diag::note_template_prev_declaration) 328 << false; 329 } else if (New->getTemplateSpecializationKind() 330 != TSK_ImplicitInstantiation && 331 New->getTemplateSpecializationKind() != TSK_Undeclared) { 332 // C++ [temp.expr.spec]p21: 333 // Default function arguments shall not be specified in a declaration 334 // or a definition for one of the following explicit specializations: 335 // - the explicit specialization of a function template; 336 // - the explicit specialization of a member function template; 337 // - the explicit specialization of a member function of a class 338 // template where the class template specialization to which the 339 // member function specialization belongs is implicitly 340 // instantiated. 341 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 342 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 343 << New->getDeclName() 344 << NewParam->getDefaultArgRange(); 345 } else if (New->getDeclContext()->isDependentContext()) { 346 // C++ [dcl.fct.default]p6 (DR217): 347 // Default arguments for a member function of a class template shall 348 // be specified on the initial declaration of the member function 349 // within the class template. 350 // 351 // Reading the tea leaves a bit in DR217 and its reference to DR205 352 // leads me to the conclusion that one cannot add default function 353 // arguments for an out-of-line definition of a member function of a 354 // dependent type. 355 int WhichKind = 2; 356 if (CXXRecordDecl *Record 357 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 358 if (Record->getDescribedClassTemplate()) 359 WhichKind = 0; 360 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 361 WhichKind = 1; 362 else 363 WhichKind = 2; 364 } 365 366 Diag(NewParam->getLocation(), 367 diag::err_param_default_argument_member_template_redecl) 368 << WhichKind 369 << NewParam->getDefaultArgRange(); 370 } 371 } 372 } 373 374 if (CheckEquivalentExceptionSpec(Old, New)) 375 Invalid = true; 376 377 return Invalid; 378} 379 380/// CheckCXXDefaultArguments - Verify that the default arguments for a 381/// function declaration are well-formed according to C++ 382/// [dcl.fct.default]. 383void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 384 unsigned NumParams = FD->getNumParams(); 385 unsigned p; 386 387 // Find first parameter with a default argument 388 for (p = 0; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (Param->hasDefaultArg()) 391 break; 392 } 393 394 // C++ [dcl.fct.default]p4: 395 // In a given function declaration, all parameters 396 // subsequent to a parameter with a default argument shall 397 // have default arguments supplied in this or previous 398 // declarations. A default argument shall not be redefined 399 // by a later declaration (not even to the same value). 400 unsigned LastMissingDefaultArg = 0; 401 for (; p < NumParams; ++p) { 402 ParmVarDecl *Param = FD->getParamDecl(p); 403 if (!Param->hasDefaultArg()) { 404 if (Param->isInvalidDecl()) 405 /* We already complained about this parameter. */; 406 else if (Param->getIdentifier()) 407 Diag(Param->getLocation(), 408 diag::err_param_default_argument_missing_name) 409 << Param->getIdentifier(); 410 else 411 Diag(Param->getLocation(), 412 diag::err_param_default_argument_missing); 413 414 LastMissingDefaultArg = p; 415 } 416 } 417 418 if (LastMissingDefaultArg > 0) { 419 // Some default arguments were missing. Clear out all of the 420 // default arguments up to (and including) the last missing 421 // default argument, so that we leave the function parameters 422 // in a semantically valid state. 423 for (p = 0; p <= LastMissingDefaultArg; ++p) { 424 ParmVarDecl *Param = FD->getParamDecl(p); 425 if (Param->hasDefaultArg()) { 426 Param->setDefaultArg(0); 427 } 428 } 429 } 430} 431 432/// isCurrentClassName - Determine whether the identifier II is the 433/// name of the class type currently being defined. In the case of 434/// nested classes, this will only return true if II is the name of 435/// the innermost class. 436bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 437 const CXXScopeSpec *SS) { 438 assert(getLangOptions().CPlusPlus && "No class names in C!"); 439 440 CXXRecordDecl *CurDecl; 441 if (SS && SS->isSet() && !SS->isInvalid()) { 442 DeclContext *DC = computeDeclContext(*SS, true); 443 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 444 } else 445 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 446 447 if (CurDecl && CurDecl->getIdentifier()) 448 return &II == CurDecl->getIdentifier(); 449 else 450 return false; 451} 452 453/// \brief Check the validity of a C++ base class specifier. 454/// 455/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 456/// and returns NULL otherwise. 457CXXBaseSpecifier * 458Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 459 SourceRange SpecifierRange, 460 bool Virtual, AccessSpecifier Access, 461 TypeSourceInfo *TInfo) { 462 QualType BaseType = TInfo->getType(); 463 464 // C++ [class.union]p1: 465 // A union shall not have base classes. 466 if (Class->isUnion()) { 467 Diag(Class->getLocation(), diag::err_base_clause_on_union) 468 << SpecifierRange; 469 return 0; 470 } 471 472 if (BaseType->isDependentType()) 473 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 474 Class->getTagKind() == TTK_Class, 475 Access, TInfo); 476 477 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 478 479 // Base specifiers must be record types. 480 if (!BaseType->isRecordType()) { 481 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 482 return 0; 483 } 484 485 // C++ [class.union]p1: 486 // A union shall not be used as a base class. 487 if (BaseType->isUnionType()) { 488 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 489 return 0; 490 } 491 492 // C++ [class.derived]p2: 493 // The class-name in a base-specifier shall not be an incompletely 494 // defined class. 495 if (RequireCompleteType(BaseLoc, BaseType, 496 PDiag(diag::err_incomplete_base_class) 497 << SpecifierRange)) { 498 Class->setInvalidDecl(); 499 return 0; 500 } 501 502 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 503 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 504 assert(BaseDecl && "Record type has no declaration"); 505 BaseDecl = BaseDecl->getDefinition(); 506 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 507 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 508 assert(CXXBaseDecl && "Base type is not a C++ type"); 509 510 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 511 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 512 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 513 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 514 << BaseType; 515 return 0; 516 } 517 518 if (BaseDecl->isInvalidDecl()) 519 Class->setInvalidDecl(); 520 521 // Create the base specifier. 522 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 523 Class->getTagKind() == TTK_Class, 524 Access, TInfo); 525} 526 527/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 528/// one entry in the base class list of a class specifier, for 529/// example: 530/// class foo : public bar, virtual private baz { 531/// 'public bar' and 'virtual private baz' are each base-specifiers. 532BaseResult 533Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 534 bool Virtual, AccessSpecifier Access, 535 ParsedType basetype, SourceLocation BaseLoc) { 536 if (!classdecl) 537 return true; 538 539 AdjustDeclIfTemplate(classdecl); 540 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 541 if (!Class) 542 return true; 543 544 TypeSourceInfo *TInfo = 0; 545 GetTypeFromParser(basetype, &TInfo); 546 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 547 Virtual, Access, TInfo)) 548 return BaseSpec; 549 550 return true; 551} 552 553/// \brief Performs the actual work of attaching the given base class 554/// specifiers to a C++ class. 555bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 556 unsigned NumBases) { 557 if (NumBases == 0) 558 return false; 559 560 // Used to keep track of which base types we have already seen, so 561 // that we can properly diagnose redundant direct base types. Note 562 // that the key is always the unqualified canonical type of the base 563 // class. 564 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 565 566 // Copy non-redundant base specifiers into permanent storage. 567 unsigned NumGoodBases = 0; 568 bool Invalid = false; 569 for (unsigned idx = 0; idx < NumBases; ++idx) { 570 QualType NewBaseType 571 = Context.getCanonicalType(Bases[idx]->getType()); 572 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 573 if (!Class->hasObjectMember()) { 574 if (const RecordType *FDTTy = 575 NewBaseType.getTypePtr()->getAs<RecordType>()) 576 if (FDTTy->getDecl()->hasObjectMember()) 577 Class->setHasObjectMember(true); 578 } 579 580 if (KnownBaseTypes[NewBaseType]) { 581 // C++ [class.mi]p3: 582 // A class shall not be specified as a direct base class of a 583 // derived class more than once. 584 Diag(Bases[idx]->getSourceRange().getBegin(), 585 diag::err_duplicate_base_class) 586 << KnownBaseTypes[NewBaseType]->getType() 587 << Bases[idx]->getSourceRange(); 588 589 // Delete the duplicate base class specifier; we're going to 590 // overwrite its pointer later. 591 Context.Deallocate(Bases[idx]); 592 593 Invalid = true; 594 } else { 595 // Okay, add this new base class. 596 KnownBaseTypes[NewBaseType] = Bases[idx]; 597 Bases[NumGoodBases++] = Bases[idx]; 598 } 599 } 600 601 // Attach the remaining base class specifiers to the derived class. 602 Class->setBases(Bases, NumGoodBases); 603 604 // Delete the remaining (good) base class specifiers, since their 605 // data has been copied into the CXXRecordDecl. 606 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 607 Context.Deallocate(Bases[idx]); 608 609 return Invalid; 610} 611 612/// ActOnBaseSpecifiers - Attach the given base specifiers to the 613/// class, after checking whether there are any duplicate base 614/// classes. 615void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 616 unsigned NumBases) { 617 if (!ClassDecl || !Bases || !NumBases) 618 return; 619 620 AdjustDeclIfTemplate(ClassDecl); 621 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 622 (CXXBaseSpecifier**)(Bases), NumBases); 623} 624 625static CXXRecordDecl *GetClassForType(QualType T) { 626 if (const RecordType *RT = T->getAs<RecordType>()) 627 return cast<CXXRecordDecl>(RT->getDecl()); 628 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 629 return ICT->getDecl(); 630 else 631 return 0; 632} 633 634/// \brief Determine whether the type \p Derived is a C++ class that is 635/// derived from the type \p Base. 636bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 637 if (!getLangOptions().CPlusPlus) 638 return false; 639 640 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 641 if (!DerivedRD) 642 return false; 643 644 CXXRecordDecl *BaseRD = GetClassForType(Base); 645 if (!BaseRD) 646 return false; 647 648 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 649 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 650} 651 652/// \brief Determine whether the type \p Derived is a C++ class that is 653/// derived from the type \p Base. 654bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 655 if (!getLangOptions().CPlusPlus) 656 return false; 657 658 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 659 if (!DerivedRD) 660 return false; 661 662 CXXRecordDecl *BaseRD = GetClassForType(Base); 663 if (!BaseRD) 664 return false; 665 666 return DerivedRD->isDerivedFrom(BaseRD, Paths); 667} 668 669void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 670 CXXCastPath &BasePathArray) { 671 assert(BasePathArray.empty() && "Base path array must be empty!"); 672 assert(Paths.isRecordingPaths() && "Must record paths!"); 673 674 const CXXBasePath &Path = Paths.front(); 675 676 // We first go backward and check if we have a virtual base. 677 // FIXME: It would be better if CXXBasePath had the base specifier for 678 // the nearest virtual base. 679 unsigned Start = 0; 680 for (unsigned I = Path.size(); I != 0; --I) { 681 if (Path[I - 1].Base->isVirtual()) { 682 Start = I - 1; 683 break; 684 } 685 } 686 687 // Now add all bases. 688 for (unsigned I = Start, E = Path.size(); I != E; ++I) 689 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 690} 691 692/// \brief Determine whether the given base path includes a virtual 693/// base class. 694bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 695 for (CXXCastPath::const_iterator B = BasePath.begin(), 696 BEnd = BasePath.end(); 697 B != BEnd; ++B) 698 if ((*B)->isVirtual()) 699 return true; 700 701 return false; 702} 703 704/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 705/// conversion (where Derived and Base are class types) is 706/// well-formed, meaning that the conversion is unambiguous (and 707/// that all of the base classes are accessible). Returns true 708/// and emits a diagnostic if the code is ill-formed, returns false 709/// otherwise. Loc is the location where this routine should point to 710/// if there is an error, and Range is the source range to highlight 711/// if there is an error. 712bool 713Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 714 unsigned InaccessibleBaseID, 715 unsigned AmbigiousBaseConvID, 716 SourceLocation Loc, SourceRange Range, 717 DeclarationName Name, 718 CXXCastPath *BasePath) { 719 // First, determine whether the path from Derived to Base is 720 // ambiguous. This is slightly more expensive than checking whether 721 // the Derived to Base conversion exists, because here we need to 722 // explore multiple paths to determine if there is an ambiguity. 723 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 724 /*DetectVirtual=*/false); 725 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 726 assert(DerivationOkay && 727 "Can only be used with a derived-to-base conversion"); 728 (void)DerivationOkay; 729 730 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 731 if (InaccessibleBaseID) { 732 // Check that the base class can be accessed. 733 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 734 InaccessibleBaseID)) { 735 case AR_inaccessible: 736 return true; 737 case AR_accessible: 738 case AR_dependent: 739 case AR_delayed: 740 break; 741 } 742 } 743 744 // Build a base path if necessary. 745 if (BasePath) 746 BuildBasePathArray(Paths, *BasePath); 747 return false; 748 } 749 750 // We know that the derived-to-base conversion is ambiguous, and 751 // we're going to produce a diagnostic. Perform the derived-to-base 752 // search just one more time to compute all of the possible paths so 753 // that we can print them out. This is more expensive than any of 754 // the previous derived-to-base checks we've done, but at this point 755 // performance isn't as much of an issue. 756 Paths.clear(); 757 Paths.setRecordingPaths(true); 758 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 759 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 760 (void)StillOkay; 761 762 // Build up a textual representation of the ambiguous paths, e.g., 763 // D -> B -> A, that will be used to illustrate the ambiguous 764 // conversions in the diagnostic. We only print one of the paths 765 // to each base class subobject. 766 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 767 768 Diag(Loc, AmbigiousBaseConvID) 769 << Derived << Base << PathDisplayStr << Range << Name; 770 return true; 771} 772 773bool 774Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 775 SourceLocation Loc, SourceRange Range, 776 CXXCastPath *BasePath, 777 bool IgnoreAccess) { 778 return CheckDerivedToBaseConversion(Derived, Base, 779 IgnoreAccess ? 0 780 : diag::err_upcast_to_inaccessible_base, 781 diag::err_ambiguous_derived_to_base_conv, 782 Loc, Range, DeclarationName(), 783 BasePath); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 823Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 824 SourceLocation ASLoc, 825 SourceLocation ColonLoc) { 826 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 827 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 828 ASLoc, ColonLoc); 829 CurContext->addHiddenDecl(ASDecl); 830 return ASDecl; 831} 832 833/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 834/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 835/// bitfield width if there is one and 'InitExpr' specifies the initializer if 836/// any. 837Decl * 838Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 839 MultiTemplateParamsArg TemplateParameterLists, 840 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 841 bool Deleted) { 842 const DeclSpec &DS = D.getDeclSpec(); 843 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 844 DeclarationName Name = NameInfo.getName(); 845 SourceLocation Loc = NameInfo.getLoc(); 846 847 // For anonymous bitfields, the location should point to the type. 848 if (Loc.isInvalid()) 849 Loc = D.getSourceRange().getBegin(); 850 851 Expr *BitWidth = static_cast<Expr*>(BW); 852 Expr *Init = static_cast<Expr*>(InitExpr); 853 854 assert(isa<CXXRecordDecl>(CurContext)); 855 assert(!DS.isFriendSpecified()); 856 857 bool isFunc = false; 858 if (D.isFunctionDeclarator()) 859 isFunc = true; 860 else if (D.getNumTypeObjects() == 0 && 861 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 862 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 863 isFunc = TDType->isFunctionType(); 864 } 865 866 // C++ 9.2p6: A member shall not be declared to have automatic storage 867 // duration (auto, register) or with the extern storage-class-specifier. 868 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 869 // data members and cannot be applied to names declared const or static, 870 // and cannot be applied to reference members. 871 switch (DS.getStorageClassSpec()) { 872 case DeclSpec::SCS_unspecified: 873 case DeclSpec::SCS_typedef: 874 case DeclSpec::SCS_static: 875 // FALL THROUGH. 876 break; 877 case DeclSpec::SCS_mutable: 878 if (isFunc) { 879 if (DS.getStorageClassSpecLoc().isValid()) 880 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 881 else 882 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 883 884 // FIXME: It would be nicer if the keyword was ignored only for this 885 // declarator. Otherwise we could get follow-up errors. 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 break; 889 default: 890 if (DS.getStorageClassSpecLoc().isValid()) 891 Diag(DS.getStorageClassSpecLoc(), 892 diag::err_storageclass_invalid_for_member); 893 else 894 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 895 D.getMutableDeclSpec().ClearStorageClassSpecs(); 896 } 897 898 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 899 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 900 !isFunc); 901 902 Decl *Member; 903 if (isInstField) { 904 CXXScopeSpec &SS = D.getCXXScopeSpec(); 905 906 907 if (SS.isSet() && !SS.isInvalid()) { 908 // The user provided a superfluous scope specifier inside a class 909 // definition: 910 // 911 // class X { 912 // int X::member; 913 // }; 914 DeclContext *DC = 0; 915 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 916 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 917 << Name << FixItHint::CreateRemoval(SS.getRange()); 918 else 919 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 920 << Name << SS.getRange(); 921 922 SS.clear(); 923 } 924 925 // FIXME: Check for template parameters! 926 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 927 AS); 928 assert(Member && "HandleField never returns null"); 929 } else { 930 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 931 if (!Member) { 932 return 0; 933 } 934 935 // Non-instance-fields can't have a bitfield. 936 if (BitWidth) { 937 if (Member->isInvalidDecl()) { 938 // don't emit another diagnostic. 939 } else if (isa<VarDecl>(Member)) { 940 // C++ 9.6p3: A bit-field shall not be a static member. 941 // "static member 'A' cannot be a bit-field" 942 Diag(Loc, diag::err_static_not_bitfield) 943 << Name << BitWidth->getSourceRange(); 944 } else if (isa<TypedefDecl>(Member)) { 945 // "typedef member 'x' cannot be a bit-field" 946 Diag(Loc, diag::err_typedef_not_bitfield) 947 << Name << BitWidth->getSourceRange(); 948 } else { 949 // A function typedef ("typedef int f(); f a;"). 950 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 951 Diag(Loc, diag::err_not_integral_type_bitfield) 952 << Name << cast<ValueDecl>(Member)->getType() 953 << BitWidth->getSourceRange(); 954 } 955 956 BitWidth = 0; 957 Member->setInvalidDecl(); 958 } 959 960 Member->setAccess(AS); 961 962 // If we have declared a member function template, set the access of the 963 // templated declaration as well. 964 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 965 FunTmpl->getTemplatedDecl()->setAccess(AS); 966 } 967 968 assert((Name || isInstField) && "No identifier for non-field ?"); 969 970 if (Init) 971 AddInitializerToDecl(Member, Init, false); 972 if (Deleted) // FIXME: Source location is not very good. 973 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 974 975 if (isInstField) { 976 FieldCollector->Add(cast<FieldDecl>(Member)); 977 return 0; 978 } 979 return Member; 980} 981 982/// \brief Find the direct and/or virtual base specifiers that 983/// correspond to the given base type, for use in base initialization 984/// within a constructor. 985static bool FindBaseInitializer(Sema &SemaRef, 986 CXXRecordDecl *ClassDecl, 987 QualType BaseType, 988 const CXXBaseSpecifier *&DirectBaseSpec, 989 const CXXBaseSpecifier *&VirtualBaseSpec) { 990 // First, check for a direct base class. 991 DirectBaseSpec = 0; 992 for (CXXRecordDecl::base_class_const_iterator Base 993 = ClassDecl->bases_begin(); 994 Base != ClassDecl->bases_end(); ++Base) { 995 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 996 // We found a direct base of this type. That's what we're 997 // initializing. 998 DirectBaseSpec = &*Base; 999 break; 1000 } 1001 } 1002 1003 // Check for a virtual base class. 1004 // FIXME: We might be able to short-circuit this if we know in advance that 1005 // there are no virtual bases. 1006 VirtualBaseSpec = 0; 1007 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1008 // We haven't found a base yet; search the class hierarchy for a 1009 // virtual base class. 1010 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1011 /*DetectVirtual=*/false); 1012 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1013 BaseType, Paths)) { 1014 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1015 Path != Paths.end(); ++Path) { 1016 if (Path->back().Base->isVirtual()) { 1017 VirtualBaseSpec = Path->back().Base; 1018 break; 1019 } 1020 } 1021 } 1022 } 1023 1024 return DirectBaseSpec || VirtualBaseSpec; 1025} 1026 1027/// ActOnMemInitializer - Handle a C++ member initializer. 1028MemInitResult 1029Sema::ActOnMemInitializer(Decl *ConstructorD, 1030 Scope *S, 1031 CXXScopeSpec &SS, 1032 IdentifierInfo *MemberOrBase, 1033 ParsedType TemplateTypeTy, 1034 SourceLocation IdLoc, 1035 SourceLocation LParenLoc, 1036 ExprTy **Args, unsigned NumArgs, 1037 SourceLocation RParenLoc) { 1038 if (!ConstructorD) 1039 return true; 1040 1041 AdjustDeclIfTemplate(ConstructorD); 1042 1043 CXXConstructorDecl *Constructor 1044 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1045 if (!Constructor) { 1046 // The user wrote a constructor initializer on a function that is 1047 // not a C++ constructor. Ignore the error for now, because we may 1048 // have more member initializers coming; we'll diagnose it just 1049 // once in ActOnMemInitializers. 1050 return true; 1051 } 1052 1053 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1054 1055 // C++ [class.base.init]p2: 1056 // Names in a mem-initializer-id are looked up in the scope of the 1057 // constructor's class and, if not found in that scope, are looked 1058 // up in the scope containing the constructor's definition. 1059 // [Note: if the constructor's class contains a member with the 1060 // same name as a direct or virtual base class of the class, a 1061 // mem-initializer-id naming the member or base class and composed 1062 // of a single identifier refers to the class member. A 1063 // mem-initializer-id for the hidden base class may be specified 1064 // using a qualified name. ] 1065 if (!SS.getScopeRep() && !TemplateTypeTy) { 1066 // Look for a member, first. 1067 FieldDecl *Member = 0; 1068 DeclContext::lookup_result Result 1069 = ClassDecl->lookup(MemberOrBase); 1070 if (Result.first != Result.second) { 1071 Member = dyn_cast<FieldDecl>(*Result.first); 1072 1073 if (Member) 1074 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1075 LParenLoc, RParenLoc); 1076 // Handle anonymous union case. 1077 if (IndirectFieldDecl* IndirectField 1078 = dyn_cast<IndirectFieldDecl>(*Result.first)) 1079 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1080 NumArgs, IdLoc, 1081 LParenLoc, RParenLoc); 1082 } 1083 } 1084 // It didn't name a member, so see if it names a class. 1085 QualType BaseType; 1086 TypeSourceInfo *TInfo = 0; 1087 1088 if (TemplateTypeTy) { 1089 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1090 } else { 1091 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1092 LookupParsedName(R, S, &SS); 1093 1094 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1095 if (!TyD) { 1096 if (R.isAmbiguous()) return true; 1097 1098 // We don't want access-control diagnostics here. 1099 R.suppressDiagnostics(); 1100 1101 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1102 bool NotUnknownSpecialization = false; 1103 DeclContext *DC = computeDeclContext(SS, false); 1104 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1105 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1106 1107 if (!NotUnknownSpecialization) { 1108 // When the scope specifier can refer to a member of an unknown 1109 // specialization, we take it as a type name. 1110 BaseType = CheckTypenameType(ETK_None, 1111 (NestedNameSpecifier *)SS.getScopeRep(), 1112 *MemberOrBase, SourceLocation(), 1113 SS.getRange(), IdLoc); 1114 if (BaseType.isNull()) 1115 return true; 1116 1117 R.clear(); 1118 R.setLookupName(MemberOrBase); 1119 } 1120 } 1121 1122 // If no results were found, try to correct typos. 1123 if (R.empty() && BaseType.isNull() && 1124 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1125 R.isSingleResult()) { 1126 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1127 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1128 // We have found a non-static data member with a similar 1129 // name to what was typed; complain and initialize that 1130 // member. 1131 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1132 << MemberOrBase << true << R.getLookupName() 1133 << FixItHint::CreateReplacement(R.getNameLoc(), 1134 R.getLookupName().getAsString()); 1135 Diag(Member->getLocation(), diag::note_previous_decl) 1136 << Member->getDeclName(); 1137 1138 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1139 LParenLoc, RParenLoc); 1140 } 1141 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1142 const CXXBaseSpecifier *DirectBaseSpec; 1143 const CXXBaseSpecifier *VirtualBaseSpec; 1144 if (FindBaseInitializer(*this, ClassDecl, 1145 Context.getTypeDeclType(Type), 1146 DirectBaseSpec, VirtualBaseSpec)) { 1147 // We have found a direct or virtual base class with a 1148 // similar name to what was typed; complain and initialize 1149 // that base class. 1150 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1151 << MemberOrBase << false << R.getLookupName() 1152 << FixItHint::CreateReplacement(R.getNameLoc(), 1153 R.getLookupName().getAsString()); 1154 1155 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1156 : VirtualBaseSpec; 1157 Diag(BaseSpec->getSourceRange().getBegin(), 1158 diag::note_base_class_specified_here) 1159 << BaseSpec->getType() 1160 << BaseSpec->getSourceRange(); 1161 1162 TyD = Type; 1163 } 1164 } 1165 } 1166 1167 if (!TyD && BaseType.isNull()) { 1168 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1169 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1170 return true; 1171 } 1172 } 1173 1174 if (BaseType.isNull()) { 1175 BaseType = Context.getTypeDeclType(TyD); 1176 if (SS.isSet()) { 1177 NestedNameSpecifier *Qualifier = 1178 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1179 1180 // FIXME: preserve source range information 1181 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1182 } 1183 } 1184 } 1185 1186 if (!TInfo) 1187 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1188 1189 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1190 LParenLoc, RParenLoc, ClassDecl); 1191} 1192 1193/// Checks an initializer expression for use of uninitialized fields, such as 1194/// containing the field that is being initialized. Returns true if there is an 1195/// uninitialized field was used an updates the SourceLocation parameter; false 1196/// otherwise. 1197static bool InitExprContainsUninitializedFields(const Stmt *S, 1198 const ValueDecl *LhsField, 1199 SourceLocation *L) { 1200 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1201 1202 if (isa<CallExpr>(S)) { 1203 // Do not descend into function calls or constructors, as the use 1204 // of an uninitialized field may be valid. One would have to inspect 1205 // the contents of the function/ctor to determine if it is safe or not. 1206 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1207 // may be safe, depending on what the function/ctor does. 1208 return false; 1209 } 1210 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1211 const NamedDecl *RhsField = ME->getMemberDecl(); 1212 1213 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1214 // The member expression points to a static data member. 1215 assert(VD->isStaticDataMember() && 1216 "Member points to non-static data member!"); 1217 (void)VD; 1218 return false; 1219 } 1220 1221 if (isa<EnumConstantDecl>(RhsField)) { 1222 // The member expression points to an enum. 1223 return false; 1224 } 1225 1226 if (RhsField == LhsField) { 1227 // Initializing a field with itself. Throw a warning. 1228 // But wait; there are exceptions! 1229 // Exception #1: The field may not belong to this record. 1230 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1231 const Expr *base = ME->getBase(); 1232 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1233 // Even though the field matches, it does not belong to this record. 1234 return false; 1235 } 1236 // None of the exceptions triggered; return true to indicate an 1237 // uninitialized field was used. 1238 *L = ME->getMemberLoc(); 1239 return true; 1240 } 1241 } else if (isa<SizeOfAlignOfExpr>(S)) { 1242 // sizeof/alignof doesn't reference contents, do not warn. 1243 return false; 1244 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1245 // address-of doesn't reference contents (the pointer may be dereferenced 1246 // in the same expression but it would be rare; and weird). 1247 if (UOE->getOpcode() == UO_AddrOf) 1248 return false; 1249 } 1250 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1251 it != e; ++it) { 1252 if (!*it) { 1253 // An expression such as 'member(arg ?: "")' may trigger this. 1254 continue; 1255 } 1256 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1257 return true; 1258 } 1259 return false; 1260} 1261 1262MemInitResult 1263Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1264 unsigned NumArgs, SourceLocation IdLoc, 1265 SourceLocation LParenLoc, 1266 SourceLocation RParenLoc) { 1267 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1268 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1269 assert((DirectMember || IndirectMember) && 1270 "Member must be a FieldDecl or IndirectFieldDecl"); 1271 1272 if (Member->isInvalidDecl()) 1273 return true; 1274 1275 // Diagnose value-uses of fields to initialize themselves, e.g. 1276 // foo(foo) 1277 // where foo is not also a parameter to the constructor. 1278 // TODO: implement -Wuninitialized and fold this into that framework. 1279 for (unsigned i = 0; i < NumArgs; ++i) { 1280 SourceLocation L; 1281 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1282 // FIXME: Return true in the case when other fields are used before being 1283 // uninitialized. For example, let this field be the i'th field. When 1284 // initializing the i'th field, throw a warning if any of the >= i'th 1285 // fields are used, as they are not yet initialized. 1286 // Right now we are only handling the case where the i'th field uses 1287 // itself in its initializer. 1288 Diag(L, diag::warn_field_is_uninit); 1289 } 1290 } 1291 1292 bool HasDependentArg = false; 1293 for (unsigned i = 0; i < NumArgs; i++) 1294 HasDependentArg |= Args[i]->isTypeDependent(); 1295 1296 Expr *Init; 1297 if (Member->getType()->isDependentType() || HasDependentArg) { 1298 // Can't check initialization for a member of dependent type or when 1299 // any of the arguments are type-dependent expressions. 1300 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1301 RParenLoc); 1302 1303 // Erase any temporaries within this evaluation context; we're not 1304 // going to track them in the AST, since we'll be rebuilding the 1305 // ASTs during template instantiation. 1306 ExprTemporaries.erase( 1307 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1308 ExprTemporaries.end()); 1309 } else { 1310 // Initialize the member. 1311 InitializedEntity MemberEntity = 1312 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1313 : InitializedEntity::InitializeMember(IndirectMember, 0); 1314 InitializationKind Kind = 1315 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1316 1317 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1318 1319 ExprResult MemberInit = 1320 InitSeq.Perform(*this, MemberEntity, Kind, 1321 MultiExprArg(*this, Args, NumArgs), 0); 1322 if (MemberInit.isInvalid()) 1323 return true; 1324 1325 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1326 1327 // C++0x [class.base.init]p7: 1328 // The initialization of each base and member constitutes a 1329 // full-expression. 1330 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1331 if (MemberInit.isInvalid()) 1332 return true; 1333 1334 // If we are in a dependent context, template instantiation will 1335 // perform this type-checking again. Just save the arguments that we 1336 // received in a ParenListExpr. 1337 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1338 // of the information that we have about the member 1339 // initializer. However, deconstructing the ASTs is a dicey process, 1340 // and this approach is far more likely to get the corner cases right. 1341 if (CurContext->isDependentContext()) 1342 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1343 RParenLoc); 1344 else 1345 Init = MemberInit.get(); 1346 } 1347 1348 if (DirectMember) { 1349 return new (Context) CXXBaseOrMemberInitializer(Context, DirectMember, 1350 IdLoc, LParenLoc, Init, 1351 RParenLoc); 1352 } else { 1353 return new (Context) CXXBaseOrMemberInitializer(Context, IndirectMember, 1354 IdLoc, LParenLoc, Init, 1355 RParenLoc); 1356 } 1357} 1358 1359MemInitResult 1360Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1361 Expr **Args, unsigned NumArgs, 1362 SourceLocation LParenLoc, SourceLocation RParenLoc, 1363 CXXRecordDecl *ClassDecl) { 1364 bool HasDependentArg = false; 1365 for (unsigned i = 0; i < NumArgs; i++) 1366 HasDependentArg |= Args[i]->isTypeDependent(); 1367 1368 SourceLocation BaseLoc 1369 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1370 1371 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1372 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1373 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1374 1375 // C++ [class.base.init]p2: 1376 // [...] Unless the mem-initializer-id names a nonstatic data 1377 // member of the constructor's class or a direct or virtual base 1378 // of that class, the mem-initializer is ill-formed. A 1379 // mem-initializer-list can initialize a base class using any 1380 // name that denotes that base class type. 1381 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1382 1383 // Check for direct and virtual base classes. 1384 const CXXBaseSpecifier *DirectBaseSpec = 0; 1385 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1386 if (!Dependent) { 1387 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1388 VirtualBaseSpec); 1389 1390 // C++ [base.class.init]p2: 1391 // Unless the mem-initializer-id names a nonstatic data member of the 1392 // constructor's class or a direct or virtual base of that class, the 1393 // mem-initializer is ill-formed. 1394 if (!DirectBaseSpec && !VirtualBaseSpec) { 1395 // If the class has any dependent bases, then it's possible that 1396 // one of those types will resolve to the same type as 1397 // BaseType. Therefore, just treat this as a dependent base 1398 // class initialization. FIXME: Should we try to check the 1399 // initialization anyway? It seems odd. 1400 if (ClassDecl->hasAnyDependentBases()) 1401 Dependent = true; 1402 else 1403 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1404 << BaseType << Context.getTypeDeclType(ClassDecl) 1405 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1406 } 1407 } 1408 1409 if (Dependent) { 1410 // Can't check initialization for a base of dependent type or when 1411 // any of the arguments are type-dependent expressions. 1412 ExprResult BaseInit 1413 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1414 RParenLoc)); 1415 1416 // Erase any temporaries within this evaluation context; we're not 1417 // going to track them in the AST, since we'll be rebuilding the 1418 // ASTs during template instantiation. 1419 ExprTemporaries.erase( 1420 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1421 ExprTemporaries.end()); 1422 1423 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1424 /*IsVirtual=*/false, 1425 LParenLoc, 1426 BaseInit.takeAs<Expr>(), 1427 RParenLoc); 1428 } 1429 1430 // C++ [base.class.init]p2: 1431 // If a mem-initializer-id is ambiguous because it designates both 1432 // a direct non-virtual base class and an inherited virtual base 1433 // class, the mem-initializer is ill-formed. 1434 if (DirectBaseSpec && VirtualBaseSpec) 1435 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1436 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1437 1438 CXXBaseSpecifier *BaseSpec 1439 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1440 if (!BaseSpec) 1441 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1442 1443 // Initialize the base. 1444 InitializedEntity BaseEntity = 1445 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1446 InitializationKind Kind = 1447 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1448 1449 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1450 1451 ExprResult BaseInit = 1452 InitSeq.Perform(*this, BaseEntity, Kind, 1453 MultiExprArg(*this, Args, NumArgs), 0); 1454 if (BaseInit.isInvalid()) 1455 return true; 1456 1457 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1458 1459 // C++0x [class.base.init]p7: 1460 // The initialization of each base and member constitutes a 1461 // full-expression. 1462 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1463 if (BaseInit.isInvalid()) 1464 return true; 1465 1466 // If we are in a dependent context, template instantiation will 1467 // perform this type-checking again. Just save the arguments that we 1468 // received in a ParenListExpr. 1469 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1470 // of the information that we have about the base 1471 // initializer. However, deconstructing the ASTs is a dicey process, 1472 // and this approach is far more likely to get the corner cases right. 1473 if (CurContext->isDependentContext()) { 1474 ExprResult Init 1475 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1476 RParenLoc)); 1477 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1478 BaseSpec->isVirtual(), 1479 LParenLoc, 1480 Init.takeAs<Expr>(), 1481 RParenLoc); 1482 } 1483 1484 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1485 BaseSpec->isVirtual(), 1486 LParenLoc, 1487 BaseInit.takeAs<Expr>(), 1488 RParenLoc); 1489} 1490 1491/// ImplicitInitializerKind - How an implicit base or member initializer should 1492/// initialize its base or member. 1493enum ImplicitInitializerKind { 1494 IIK_Default, 1495 IIK_Copy, 1496 IIK_Move 1497}; 1498 1499static bool 1500BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1501 ImplicitInitializerKind ImplicitInitKind, 1502 CXXBaseSpecifier *BaseSpec, 1503 bool IsInheritedVirtualBase, 1504 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1505 InitializedEntity InitEntity 1506 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1507 IsInheritedVirtualBase); 1508 1509 ExprResult BaseInit; 1510 1511 switch (ImplicitInitKind) { 1512 case IIK_Default: { 1513 InitializationKind InitKind 1514 = InitializationKind::CreateDefault(Constructor->getLocation()); 1515 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1516 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1517 MultiExprArg(SemaRef, 0, 0)); 1518 break; 1519 } 1520 1521 case IIK_Copy: { 1522 ParmVarDecl *Param = Constructor->getParamDecl(0); 1523 QualType ParamType = Param->getType().getNonReferenceType(); 1524 1525 Expr *CopyCtorArg = 1526 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1527 Constructor->getLocation(), ParamType, 1528 VK_LValue, 0); 1529 1530 // Cast to the base class to avoid ambiguities. 1531 QualType ArgTy = 1532 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1533 ParamType.getQualifiers()); 1534 1535 CXXCastPath BasePath; 1536 BasePath.push_back(BaseSpec); 1537 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1538 CK_UncheckedDerivedToBase, 1539 VK_LValue, &BasePath); 1540 1541 InitializationKind InitKind 1542 = InitializationKind::CreateDirect(Constructor->getLocation(), 1543 SourceLocation(), SourceLocation()); 1544 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1545 &CopyCtorArg, 1); 1546 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1547 MultiExprArg(&CopyCtorArg, 1)); 1548 break; 1549 } 1550 1551 case IIK_Move: 1552 assert(false && "Unhandled initializer kind!"); 1553 } 1554 1555 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1556 if (BaseInit.isInvalid()) 1557 return true; 1558 1559 CXXBaseInit = 1560 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1561 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1562 SourceLocation()), 1563 BaseSpec->isVirtual(), 1564 SourceLocation(), 1565 BaseInit.takeAs<Expr>(), 1566 SourceLocation()); 1567 1568 return false; 1569} 1570 1571static bool 1572BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1573 ImplicitInitializerKind ImplicitInitKind, 1574 FieldDecl *Field, 1575 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1576 if (Field->isInvalidDecl()) 1577 return true; 1578 1579 SourceLocation Loc = Constructor->getLocation(); 1580 1581 if (ImplicitInitKind == IIK_Copy) { 1582 ParmVarDecl *Param = Constructor->getParamDecl(0); 1583 QualType ParamType = Param->getType().getNonReferenceType(); 1584 1585 Expr *MemberExprBase = 1586 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1587 Loc, ParamType, VK_LValue, 0); 1588 1589 // Build a reference to this field within the parameter. 1590 CXXScopeSpec SS; 1591 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1592 Sema::LookupMemberName); 1593 MemberLookup.addDecl(Field, AS_public); 1594 MemberLookup.resolveKind(); 1595 ExprResult CopyCtorArg 1596 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1597 ParamType, Loc, 1598 /*IsArrow=*/false, 1599 SS, 1600 /*FirstQualifierInScope=*/0, 1601 MemberLookup, 1602 /*TemplateArgs=*/0); 1603 if (CopyCtorArg.isInvalid()) 1604 return true; 1605 1606 // When the field we are copying is an array, create index variables for 1607 // each dimension of the array. We use these index variables to subscript 1608 // the source array, and other clients (e.g., CodeGen) will perform the 1609 // necessary iteration with these index variables. 1610 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1611 QualType BaseType = Field->getType(); 1612 QualType SizeType = SemaRef.Context.getSizeType(); 1613 while (const ConstantArrayType *Array 1614 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1615 // Create the iteration variable for this array index. 1616 IdentifierInfo *IterationVarName = 0; 1617 { 1618 llvm::SmallString<8> Str; 1619 llvm::raw_svector_ostream OS(Str); 1620 OS << "__i" << IndexVariables.size(); 1621 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1622 } 1623 VarDecl *IterationVar 1624 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1625 IterationVarName, SizeType, 1626 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1627 SC_None, SC_None); 1628 IndexVariables.push_back(IterationVar); 1629 1630 // Create a reference to the iteration variable. 1631 ExprResult IterationVarRef 1632 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1633 assert(!IterationVarRef.isInvalid() && 1634 "Reference to invented variable cannot fail!"); 1635 1636 // Subscript the array with this iteration variable. 1637 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1638 Loc, 1639 IterationVarRef.take(), 1640 Loc); 1641 if (CopyCtorArg.isInvalid()) 1642 return true; 1643 1644 BaseType = Array->getElementType(); 1645 } 1646 1647 // Construct the entity that we will be initializing. For an array, this 1648 // will be first element in the array, which may require several levels 1649 // of array-subscript entities. 1650 llvm::SmallVector<InitializedEntity, 4> Entities; 1651 Entities.reserve(1 + IndexVariables.size()); 1652 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1653 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1654 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1655 0, 1656 Entities.back())); 1657 1658 // Direct-initialize to use the copy constructor. 1659 InitializationKind InitKind = 1660 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1661 1662 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1663 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1664 &CopyCtorArgE, 1); 1665 1666 ExprResult MemberInit 1667 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1668 MultiExprArg(&CopyCtorArgE, 1)); 1669 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1670 if (MemberInit.isInvalid()) 1671 return true; 1672 1673 CXXMemberInit 1674 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1675 MemberInit.takeAs<Expr>(), Loc, 1676 IndexVariables.data(), 1677 IndexVariables.size()); 1678 return false; 1679 } 1680 1681 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1682 1683 QualType FieldBaseElementType = 1684 SemaRef.Context.getBaseElementType(Field->getType()); 1685 1686 if (FieldBaseElementType->isRecordType()) { 1687 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1688 InitializationKind InitKind = 1689 InitializationKind::CreateDefault(Loc); 1690 1691 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1692 ExprResult MemberInit = 1693 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1694 1695 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1696 if (MemberInit.isInvalid()) 1697 return true; 1698 1699 CXXMemberInit = 1700 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1701 Field, Loc, Loc, 1702 MemberInit.get(), 1703 Loc); 1704 return false; 1705 } 1706 1707 if (FieldBaseElementType->isReferenceType()) { 1708 SemaRef.Diag(Constructor->getLocation(), 1709 diag::err_uninitialized_member_in_ctor) 1710 << (int)Constructor->isImplicit() 1711 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1712 << 0 << Field->getDeclName(); 1713 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1714 return true; 1715 } 1716 1717 if (FieldBaseElementType.isConstQualified()) { 1718 SemaRef.Diag(Constructor->getLocation(), 1719 diag::err_uninitialized_member_in_ctor) 1720 << (int)Constructor->isImplicit() 1721 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1722 << 1 << Field->getDeclName(); 1723 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1724 return true; 1725 } 1726 1727 // Nothing to initialize. 1728 CXXMemberInit = 0; 1729 return false; 1730} 1731 1732namespace { 1733struct BaseAndFieldInfo { 1734 Sema &S; 1735 CXXConstructorDecl *Ctor; 1736 bool AnyErrorsInInits; 1737 ImplicitInitializerKind IIK; 1738 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1739 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1740 1741 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1742 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1743 // FIXME: Handle implicit move constructors. 1744 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1745 IIK = IIK_Copy; 1746 else 1747 IIK = IIK_Default; 1748 } 1749}; 1750} 1751 1752static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1753 FieldDecl *Top, FieldDecl *Field) { 1754 1755 // Overwhelmingly common case: we have a direct initializer for this field. 1756 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1757 Info.AllToInit.push_back(Init); 1758 return false; 1759 } 1760 1761 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1762 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1763 assert(FieldClassType && "anonymous struct/union without record type"); 1764 CXXRecordDecl *FieldClassDecl 1765 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1766 1767 // Even though union members never have non-trivial default 1768 // constructions in C++03, we still build member initializers for aggregate 1769 // record types which can be union members, and C++0x allows non-trivial 1770 // default constructors for union members, so we ensure that only one 1771 // member is initialized for these. 1772 if (FieldClassDecl->isUnion()) { 1773 // First check for an explicit initializer for one field. 1774 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1775 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1776 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1777 Info.AllToInit.push_back(Init); 1778 1779 // Once we've initialized a field of an anonymous union, the union 1780 // field in the class is also initialized, so exit immediately. 1781 return false; 1782 } else if ((*FA)->isAnonymousStructOrUnion()) { 1783 if (CollectFieldInitializer(Info, Top, *FA)) 1784 return true; 1785 } 1786 } 1787 1788 // Fallthrough and construct a default initializer for the union as 1789 // a whole, which can call its default constructor if such a thing exists 1790 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1791 // behavior going forward with C++0x, when anonymous unions there are 1792 // finalized, we should revisit this. 1793 } else { 1794 // For structs, we simply descend through to initialize all members where 1795 // necessary. 1796 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1797 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1798 if (CollectFieldInitializer(Info, Top, *FA)) 1799 return true; 1800 } 1801 } 1802 } 1803 1804 // Don't try to build an implicit initializer if there were semantic 1805 // errors in any of the initializers (and therefore we might be 1806 // missing some that the user actually wrote). 1807 if (Info.AnyErrorsInInits) 1808 return false; 1809 1810 CXXBaseOrMemberInitializer *Init = 0; 1811 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1812 return true; 1813 1814 if (Init) 1815 Info.AllToInit.push_back(Init); 1816 1817 return false; 1818} 1819 1820bool 1821Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1822 CXXBaseOrMemberInitializer **Initializers, 1823 unsigned NumInitializers, 1824 bool AnyErrors) { 1825 if (Constructor->getDeclContext()->isDependentContext()) { 1826 // Just store the initializers as written, they will be checked during 1827 // instantiation. 1828 if (NumInitializers > 0) { 1829 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1830 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1831 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1832 memcpy(baseOrMemberInitializers, Initializers, 1833 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1834 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1835 } 1836 1837 return false; 1838 } 1839 1840 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1841 1842 // We need to build the initializer AST according to order of construction 1843 // and not what user specified in the Initializers list. 1844 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1845 if (!ClassDecl) 1846 return true; 1847 1848 bool HadError = false; 1849 1850 for (unsigned i = 0; i < NumInitializers; i++) { 1851 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1852 1853 if (Member->isBaseInitializer()) 1854 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1855 else 1856 Info.AllBaseFields[Member->getAnyMember()] = Member; 1857 } 1858 1859 // Keep track of the direct virtual bases. 1860 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1861 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1862 E = ClassDecl->bases_end(); I != E; ++I) { 1863 if (I->isVirtual()) 1864 DirectVBases.insert(I); 1865 } 1866 1867 // Push virtual bases before others. 1868 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1869 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1870 1871 if (CXXBaseOrMemberInitializer *Value 1872 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1873 Info.AllToInit.push_back(Value); 1874 } else if (!AnyErrors) { 1875 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1876 CXXBaseOrMemberInitializer *CXXBaseInit; 1877 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1878 VBase, IsInheritedVirtualBase, 1879 CXXBaseInit)) { 1880 HadError = true; 1881 continue; 1882 } 1883 1884 Info.AllToInit.push_back(CXXBaseInit); 1885 } 1886 } 1887 1888 // Non-virtual bases. 1889 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1890 E = ClassDecl->bases_end(); Base != E; ++Base) { 1891 // Virtuals are in the virtual base list and already constructed. 1892 if (Base->isVirtual()) 1893 continue; 1894 1895 if (CXXBaseOrMemberInitializer *Value 1896 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1897 Info.AllToInit.push_back(Value); 1898 } else if (!AnyErrors) { 1899 CXXBaseOrMemberInitializer *CXXBaseInit; 1900 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1901 Base, /*IsInheritedVirtualBase=*/false, 1902 CXXBaseInit)) { 1903 HadError = true; 1904 continue; 1905 } 1906 1907 Info.AllToInit.push_back(CXXBaseInit); 1908 } 1909 } 1910 1911 // Fields. 1912 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1913 E = ClassDecl->field_end(); Field != E; ++Field) { 1914 if ((*Field)->getType()->isIncompleteArrayType()) { 1915 assert(ClassDecl->hasFlexibleArrayMember() && 1916 "Incomplete array type is not valid"); 1917 continue; 1918 } 1919 if (CollectFieldInitializer(Info, *Field, *Field)) 1920 HadError = true; 1921 } 1922 1923 NumInitializers = Info.AllToInit.size(); 1924 if (NumInitializers > 0) { 1925 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1926 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1927 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1928 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1929 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1930 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1931 1932 // Constructors implicitly reference the base and member 1933 // destructors. 1934 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1935 Constructor->getParent()); 1936 } 1937 1938 return HadError; 1939} 1940 1941static void *GetKeyForTopLevelField(FieldDecl *Field) { 1942 // For anonymous unions, use the class declaration as the key. 1943 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1944 if (RT->getDecl()->isAnonymousStructOrUnion()) 1945 return static_cast<void *>(RT->getDecl()); 1946 } 1947 return static_cast<void *>(Field); 1948} 1949 1950static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1951 return Context.getCanonicalType(BaseType).getTypePtr(); 1952} 1953 1954static void *GetKeyForMember(ASTContext &Context, 1955 CXXBaseOrMemberInitializer *Member) { 1956 if (!Member->isAnyMemberInitializer()) 1957 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1958 1959 // For fields injected into the class via declaration of an anonymous union, 1960 // use its anonymous union class declaration as the unique key. 1961 FieldDecl *Field = Member->getAnyMember(); 1962 1963 // If the field is a member of an anonymous struct or union, our key 1964 // is the anonymous record decl that's a direct child of the class. 1965 RecordDecl *RD = Field->getParent(); 1966 if (RD->isAnonymousStructOrUnion()) { 1967 while (true) { 1968 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1969 if (Parent->isAnonymousStructOrUnion()) 1970 RD = Parent; 1971 else 1972 break; 1973 } 1974 1975 return static_cast<void *>(RD); 1976 } 1977 1978 return static_cast<void *>(Field); 1979} 1980 1981static void 1982DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1983 const CXXConstructorDecl *Constructor, 1984 CXXBaseOrMemberInitializer **Inits, 1985 unsigned NumInits) { 1986 if (Constructor->getDeclContext()->isDependentContext()) 1987 return; 1988 1989 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1990 == Diagnostic::Ignored) 1991 return; 1992 1993 // Build the list of bases and members in the order that they'll 1994 // actually be initialized. The explicit initializers should be in 1995 // this same order but may be missing things. 1996 llvm::SmallVector<const void*, 32> IdealInitKeys; 1997 1998 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1999 2000 // 1. Virtual bases. 2001 for (CXXRecordDecl::base_class_const_iterator VBase = 2002 ClassDecl->vbases_begin(), 2003 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2004 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2005 2006 // 2. Non-virtual bases. 2007 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2008 E = ClassDecl->bases_end(); Base != E; ++Base) { 2009 if (Base->isVirtual()) 2010 continue; 2011 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2012 } 2013 2014 // 3. Direct fields. 2015 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2016 E = ClassDecl->field_end(); Field != E; ++Field) 2017 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2018 2019 unsigned NumIdealInits = IdealInitKeys.size(); 2020 unsigned IdealIndex = 0; 2021 2022 CXXBaseOrMemberInitializer *PrevInit = 0; 2023 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2024 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2025 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2026 2027 // Scan forward to try to find this initializer in the idealized 2028 // initializers list. 2029 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2030 if (InitKey == IdealInitKeys[IdealIndex]) 2031 break; 2032 2033 // If we didn't find this initializer, it must be because we 2034 // scanned past it on a previous iteration. That can only 2035 // happen if we're out of order; emit a warning. 2036 if (IdealIndex == NumIdealInits && PrevInit) { 2037 Sema::SemaDiagnosticBuilder D = 2038 SemaRef.Diag(PrevInit->getSourceLocation(), 2039 diag::warn_initializer_out_of_order); 2040 2041 if (PrevInit->isAnyMemberInitializer()) 2042 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2043 else 2044 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2045 2046 if (Init->isAnyMemberInitializer()) 2047 D << 0 << Init->getAnyMember()->getDeclName(); 2048 else 2049 D << 1 << Init->getBaseClassInfo()->getType(); 2050 2051 // Move back to the initializer's location in the ideal list. 2052 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2053 if (InitKey == IdealInitKeys[IdealIndex]) 2054 break; 2055 2056 assert(IdealIndex != NumIdealInits && 2057 "initializer not found in initializer list"); 2058 } 2059 2060 PrevInit = Init; 2061 } 2062} 2063 2064namespace { 2065bool CheckRedundantInit(Sema &S, 2066 CXXBaseOrMemberInitializer *Init, 2067 CXXBaseOrMemberInitializer *&PrevInit) { 2068 if (!PrevInit) { 2069 PrevInit = Init; 2070 return false; 2071 } 2072 2073 if (FieldDecl *Field = Init->getMember()) 2074 S.Diag(Init->getSourceLocation(), 2075 diag::err_multiple_mem_initialization) 2076 << Field->getDeclName() 2077 << Init->getSourceRange(); 2078 else { 2079 Type *BaseClass = Init->getBaseClass(); 2080 assert(BaseClass && "neither field nor base"); 2081 S.Diag(Init->getSourceLocation(), 2082 diag::err_multiple_base_initialization) 2083 << QualType(BaseClass, 0) 2084 << Init->getSourceRange(); 2085 } 2086 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2087 << 0 << PrevInit->getSourceRange(); 2088 2089 return true; 2090} 2091 2092typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2093typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2094 2095bool CheckRedundantUnionInit(Sema &S, 2096 CXXBaseOrMemberInitializer *Init, 2097 RedundantUnionMap &Unions) { 2098 FieldDecl *Field = Init->getAnyMember(); 2099 RecordDecl *Parent = Field->getParent(); 2100 if (!Parent->isAnonymousStructOrUnion()) 2101 return false; 2102 2103 NamedDecl *Child = Field; 2104 do { 2105 if (Parent->isUnion()) { 2106 UnionEntry &En = Unions[Parent]; 2107 if (En.first && En.first != Child) { 2108 S.Diag(Init->getSourceLocation(), 2109 diag::err_multiple_mem_union_initialization) 2110 << Field->getDeclName() 2111 << Init->getSourceRange(); 2112 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2113 << 0 << En.second->getSourceRange(); 2114 return true; 2115 } else if (!En.first) { 2116 En.first = Child; 2117 En.second = Init; 2118 } 2119 } 2120 2121 Child = Parent; 2122 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2123 } while (Parent->isAnonymousStructOrUnion()); 2124 2125 return false; 2126} 2127} 2128 2129/// ActOnMemInitializers - Handle the member initializers for a constructor. 2130void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2131 SourceLocation ColonLoc, 2132 MemInitTy **meminits, unsigned NumMemInits, 2133 bool AnyErrors) { 2134 if (!ConstructorDecl) 2135 return; 2136 2137 AdjustDeclIfTemplate(ConstructorDecl); 2138 2139 CXXConstructorDecl *Constructor 2140 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2141 2142 if (!Constructor) { 2143 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2144 return; 2145 } 2146 2147 CXXBaseOrMemberInitializer **MemInits = 2148 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2149 2150 // Mapping for the duplicate initializers check. 2151 // For member initializers, this is keyed with a FieldDecl*. 2152 // For base initializers, this is keyed with a Type*. 2153 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2154 2155 // Mapping for the inconsistent anonymous-union initializers check. 2156 RedundantUnionMap MemberUnions; 2157 2158 bool HadError = false; 2159 for (unsigned i = 0; i < NumMemInits; i++) { 2160 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2161 2162 // Set the source order index. 2163 Init->setSourceOrder(i); 2164 2165 if (Init->isAnyMemberInitializer()) { 2166 FieldDecl *Field = Init->getAnyMember(); 2167 if (CheckRedundantInit(*this, Init, Members[Field]) || 2168 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2169 HadError = true; 2170 } else { 2171 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2172 if (CheckRedundantInit(*this, Init, Members[Key])) 2173 HadError = true; 2174 } 2175 } 2176 2177 if (HadError) 2178 return; 2179 2180 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2181 2182 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2183} 2184 2185void 2186Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2187 CXXRecordDecl *ClassDecl) { 2188 // Ignore dependent contexts. 2189 if (ClassDecl->isDependentContext()) 2190 return; 2191 2192 // FIXME: all the access-control diagnostics are positioned on the 2193 // field/base declaration. That's probably good; that said, the 2194 // user might reasonably want to know why the destructor is being 2195 // emitted, and we currently don't say. 2196 2197 // Non-static data members. 2198 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2199 E = ClassDecl->field_end(); I != E; ++I) { 2200 FieldDecl *Field = *I; 2201 if (Field->isInvalidDecl()) 2202 continue; 2203 QualType FieldType = Context.getBaseElementType(Field->getType()); 2204 2205 const RecordType* RT = FieldType->getAs<RecordType>(); 2206 if (!RT) 2207 continue; 2208 2209 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2210 if (FieldClassDecl->hasTrivialDestructor()) 2211 continue; 2212 2213 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2214 CheckDestructorAccess(Field->getLocation(), Dtor, 2215 PDiag(diag::err_access_dtor_field) 2216 << Field->getDeclName() 2217 << FieldType); 2218 2219 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2220 } 2221 2222 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2223 2224 // Bases. 2225 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2226 E = ClassDecl->bases_end(); Base != E; ++Base) { 2227 // Bases are always records in a well-formed non-dependent class. 2228 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2229 2230 // Remember direct virtual bases. 2231 if (Base->isVirtual()) 2232 DirectVirtualBases.insert(RT); 2233 2234 // Ignore trivial destructors. 2235 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2236 if (BaseClassDecl->hasTrivialDestructor()) 2237 continue; 2238 2239 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2240 2241 // FIXME: caret should be on the start of the class name 2242 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2243 PDiag(diag::err_access_dtor_base) 2244 << Base->getType() 2245 << Base->getSourceRange()); 2246 2247 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2248 } 2249 2250 // Virtual bases. 2251 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2252 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2253 2254 // Bases are always records in a well-formed non-dependent class. 2255 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2256 2257 // Ignore direct virtual bases. 2258 if (DirectVirtualBases.count(RT)) 2259 continue; 2260 2261 // Ignore trivial destructors. 2262 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2263 if (BaseClassDecl->hasTrivialDestructor()) 2264 continue; 2265 2266 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2267 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2268 PDiag(diag::err_access_dtor_vbase) 2269 << VBase->getType()); 2270 2271 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2272 } 2273} 2274 2275void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2276 if (!CDtorDecl) 2277 return; 2278 2279 if (CXXConstructorDecl *Constructor 2280 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2281 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2282} 2283 2284bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2285 unsigned DiagID, AbstractDiagSelID SelID) { 2286 if (SelID == -1) 2287 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2288 else 2289 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2290} 2291 2292bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2293 const PartialDiagnostic &PD) { 2294 if (!getLangOptions().CPlusPlus) 2295 return false; 2296 2297 if (const ArrayType *AT = Context.getAsArrayType(T)) 2298 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2299 2300 if (const PointerType *PT = T->getAs<PointerType>()) { 2301 // Find the innermost pointer type. 2302 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2303 PT = T; 2304 2305 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2306 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2307 } 2308 2309 const RecordType *RT = T->getAs<RecordType>(); 2310 if (!RT) 2311 return false; 2312 2313 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2314 2315 // We can't answer whether something is abstract until it has a 2316 // definition. If it's currently being defined, we'll walk back 2317 // over all the declarations when we have a full definition. 2318 const CXXRecordDecl *Def = RD->getDefinition(); 2319 if (!Def || Def->isBeingDefined()) 2320 return false; 2321 2322 if (!RD->isAbstract()) 2323 return false; 2324 2325 Diag(Loc, PD) << RD->getDeclName(); 2326 DiagnoseAbstractType(RD); 2327 2328 return true; 2329} 2330 2331void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2332 // Check if we've already emitted the list of pure virtual functions 2333 // for this class. 2334 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2335 return; 2336 2337 CXXFinalOverriderMap FinalOverriders; 2338 RD->getFinalOverriders(FinalOverriders); 2339 2340 // Keep a set of seen pure methods so we won't diagnose the same method 2341 // more than once. 2342 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2343 2344 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2345 MEnd = FinalOverriders.end(); 2346 M != MEnd; 2347 ++M) { 2348 for (OverridingMethods::iterator SO = M->second.begin(), 2349 SOEnd = M->second.end(); 2350 SO != SOEnd; ++SO) { 2351 // C++ [class.abstract]p4: 2352 // A class is abstract if it contains or inherits at least one 2353 // pure virtual function for which the final overrider is pure 2354 // virtual. 2355 2356 // 2357 if (SO->second.size() != 1) 2358 continue; 2359 2360 if (!SO->second.front().Method->isPure()) 2361 continue; 2362 2363 if (!SeenPureMethods.insert(SO->second.front().Method)) 2364 continue; 2365 2366 Diag(SO->second.front().Method->getLocation(), 2367 diag::note_pure_virtual_function) 2368 << SO->second.front().Method->getDeclName(); 2369 } 2370 } 2371 2372 if (!PureVirtualClassDiagSet) 2373 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2374 PureVirtualClassDiagSet->insert(RD); 2375} 2376 2377namespace { 2378struct AbstractUsageInfo { 2379 Sema &S; 2380 CXXRecordDecl *Record; 2381 CanQualType AbstractType; 2382 bool Invalid; 2383 2384 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2385 : S(S), Record(Record), 2386 AbstractType(S.Context.getCanonicalType( 2387 S.Context.getTypeDeclType(Record))), 2388 Invalid(false) {} 2389 2390 void DiagnoseAbstractType() { 2391 if (Invalid) return; 2392 S.DiagnoseAbstractType(Record); 2393 Invalid = true; 2394 } 2395 2396 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2397}; 2398 2399struct CheckAbstractUsage { 2400 AbstractUsageInfo &Info; 2401 const NamedDecl *Ctx; 2402 2403 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2404 : Info(Info), Ctx(Ctx) {} 2405 2406 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2407 switch (TL.getTypeLocClass()) { 2408#define ABSTRACT_TYPELOC(CLASS, PARENT) 2409#define TYPELOC(CLASS, PARENT) \ 2410 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2411#include "clang/AST/TypeLocNodes.def" 2412 } 2413 } 2414 2415 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2416 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2417 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2418 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2419 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2420 } 2421 } 2422 2423 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2424 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2425 } 2426 2427 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2428 // Visit the type parameters from a permissive context. 2429 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2430 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2431 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2432 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2433 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2434 // TODO: other template argument types? 2435 } 2436 } 2437 2438 // Visit pointee types from a permissive context. 2439#define CheckPolymorphic(Type) \ 2440 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2441 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2442 } 2443 CheckPolymorphic(PointerTypeLoc) 2444 CheckPolymorphic(ReferenceTypeLoc) 2445 CheckPolymorphic(MemberPointerTypeLoc) 2446 CheckPolymorphic(BlockPointerTypeLoc) 2447 2448 /// Handle all the types we haven't given a more specific 2449 /// implementation for above. 2450 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2451 // Every other kind of type that we haven't called out already 2452 // that has an inner type is either (1) sugar or (2) contains that 2453 // inner type in some way as a subobject. 2454 if (TypeLoc Next = TL.getNextTypeLoc()) 2455 return Visit(Next, Sel); 2456 2457 // If there's no inner type and we're in a permissive context, 2458 // don't diagnose. 2459 if (Sel == Sema::AbstractNone) return; 2460 2461 // Check whether the type matches the abstract type. 2462 QualType T = TL.getType(); 2463 if (T->isArrayType()) { 2464 Sel = Sema::AbstractArrayType; 2465 T = Info.S.Context.getBaseElementType(T); 2466 } 2467 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2468 if (CT != Info.AbstractType) return; 2469 2470 // It matched; do some magic. 2471 if (Sel == Sema::AbstractArrayType) { 2472 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2473 << T << TL.getSourceRange(); 2474 } else { 2475 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2476 << Sel << T << TL.getSourceRange(); 2477 } 2478 Info.DiagnoseAbstractType(); 2479 } 2480}; 2481 2482void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2483 Sema::AbstractDiagSelID Sel) { 2484 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2485} 2486 2487} 2488 2489/// Check for invalid uses of an abstract type in a method declaration. 2490static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2491 CXXMethodDecl *MD) { 2492 // No need to do the check on definitions, which require that 2493 // the return/param types be complete. 2494 if (MD->isThisDeclarationADefinition()) 2495 return; 2496 2497 // For safety's sake, just ignore it if we don't have type source 2498 // information. This should never happen for non-implicit methods, 2499 // but... 2500 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2501 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2502} 2503 2504/// Check for invalid uses of an abstract type within a class definition. 2505static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2506 CXXRecordDecl *RD) { 2507 for (CXXRecordDecl::decl_iterator 2508 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2509 Decl *D = *I; 2510 if (D->isImplicit()) continue; 2511 2512 // Methods and method templates. 2513 if (isa<CXXMethodDecl>(D)) { 2514 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2515 } else if (isa<FunctionTemplateDecl>(D)) { 2516 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2517 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2518 2519 // Fields and static variables. 2520 } else if (isa<FieldDecl>(D)) { 2521 FieldDecl *FD = cast<FieldDecl>(D); 2522 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2523 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2524 } else if (isa<VarDecl>(D)) { 2525 VarDecl *VD = cast<VarDecl>(D); 2526 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2527 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2528 2529 // Nested classes and class templates. 2530 } else if (isa<CXXRecordDecl>(D)) { 2531 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2532 } else if (isa<ClassTemplateDecl>(D)) { 2533 CheckAbstractClassUsage(Info, 2534 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2535 } 2536 } 2537} 2538 2539/// \brief Perform semantic checks on a class definition that has been 2540/// completing, introducing implicitly-declared members, checking for 2541/// abstract types, etc. 2542void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2543 if (!Record) 2544 return; 2545 2546 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2547 AbstractUsageInfo Info(*this, Record); 2548 CheckAbstractClassUsage(Info, Record); 2549 } 2550 2551 // If this is not an aggregate type and has no user-declared constructor, 2552 // complain about any non-static data members of reference or const scalar 2553 // type, since they will never get initializers. 2554 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2555 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2556 bool Complained = false; 2557 for (RecordDecl::field_iterator F = Record->field_begin(), 2558 FEnd = Record->field_end(); 2559 F != FEnd; ++F) { 2560 if (F->getType()->isReferenceType() || 2561 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2562 if (!Complained) { 2563 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2564 << Record->getTagKind() << Record; 2565 Complained = true; 2566 } 2567 2568 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2569 << F->getType()->isReferenceType() 2570 << F->getDeclName(); 2571 } 2572 } 2573 } 2574 2575 if (Record->isDynamicClass()) 2576 DynamicClasses.push_back(Record); 2577 2578 if (Record->getIdentifier()) { 2579 // C++ [class.mem]p13: 2580 // If T is the name of a class, then each of the following shall have a 2581 // name different from T: 2582 // - every member of every anonymous union that is a member of class T. 2583 // 2584 // C++ [class.mem]p14: 2585 // In addition, if class T has a user-declared constructor (12.1), every 2586 // non-static data member of class T shall have a name different from T. 2587 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2588 R.first != R.second; ++R.first) { 2589 NamedDecl *D = *R.first; 2590 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2591 isa<IndirectFieldDecl>(D)) { 2592 Diag(D->getLocation(), diag::err_member_name_of_class) 2593 << D->getDeclName(); 2594 break; 2595 } 2596 } 2597 } 2598} 2599 2600void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2601 Decl *TagDecl, 2602 SourceLocation LBrac, 2603 SourceLocation RBrac, 2604 AttributeList *AttrList) { 2605 if (!TagDecl) 2606 return; 2607 2608 AdjustDeclIfTemplate(TagDecl); 2609 2610 ActOnFields(S, RLoc, TagDecl, 2611 // strict aliasing violation! 2612 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2613 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2614 2615 CheckCompletedCXXClass( 2616 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2617} 2618 2619namespace { 2620 /// \brief Helper class that collects exception specifications for 2621 /// implicitly-declared special member functions. 2622 class ImplicitExceptionSpecification { 2623 ASTContext &Context; 2624 bool AllowsAllExceptions; 2625 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2626 llvm::SmallVector<QualType, 4> Exceptions; 2627 2628 public: 2629 explicit ImplicitExceptionSpecification(ASTContext &Context) 2630 : Context(Context), AllowsAllExceptions(false) { } 2631 2632 /// \brief Whether the special member function should have any 2633 /// exception specification at all. 2634 bool hasExceptionSpecification() const { 2635 return !AllowsAllExceptions; 2636 } 2637 2638 /// \brief Whether the special member function should have a 2639 /// throw(...) exception specification (a Microsoft extension). 2640 bool hasAnyExceptionSpecification() const { 2641 return false; 2642 } 2643 2644 /// \brief The number of exceptions in the exception specification. 2645 unsigned size() const { return Exceptions.size(); } 2646 2647 /// \brief The set of exceptions in the exception specification. 2648 const QualType *data() const { return Exceptions.data(); } 2649 2650 /// \brief Note that 2651 void CalledDecl(CXXMethodDecl *Method) { 2652 // If we already know that we allow all exceptions, do nothing. 2653 if (AllowsAllExceptions || !Method) 2654 return; 2655 2656 const FunctionProtoType *Proto 2657 = Method->getType()->getAs<FunctionProtoType>(); 2658 2659 // If this function can throw any exceptions, make a note of that. 2660 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2661 AllowsAllExceptions = true; 2662 ExceptionsSeen.clear(); 2663 Exceptions.clear(); 2664 return; 2665 } 2666 2667 // Record the exceptions in this function's exception specification. 2668 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2669 EEnd = Proto->exception_end(); 2670 E != EEnd; ++E) 2671 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2672 Exceptions.push_back(*E); 2673 } 2674 }; 2675} 2676 2677 2678/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2679/// special functions, such as the default constructor, copy 2680/// constructor, or destructor, to the given C++ class (C++ 2681/// [special]p1). This routine can only be executed just before the 2682/// definition of the class is complete. 2683void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2684 if (!ClassDecl->hasUserDeclaredConstructor()) 2685 ++ASTContext::NumImplicitDefaultConstructors; 2686 2687 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2688 ++ASTContext::NumImplicitCopyConstructors; 2689 2690 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2691 ++ASTContext::NumImplicitCopyAssignmentOperators; 2692 2693 // If we have a dynamic class, then the copy assignment operator may be 2694 // virtual, so we have to declare it immediately. This ensures that, e.g., 2695 // it shows up in the right place in the vtable and that we diagnose 2696 // problems with the implicit exception specification. 2697 if (ClassDecl->isDynamicClass()) 2698 DeclareImplicitCopyAssignment(ClassDecl); 2699 } 2700 2701 if (!ClassDecl->hasUserDeclaredDestructor()) { 2702 ++ASTContext::NumImplicitDestructors; 2703 2704 // If we have a dynamic class, then the destructor may be virtual, so we 2705 // have to declare the destructor immediately. This ensures that, e.g., it 2706 // shows up in the right place in the vtable and that we diagnose problems 2707 // with the implicit exception specification. 2708 if (ClassDecl->isDynamicClass()) 2709 DeclareImplicitDestructor(ClassDecl); 2710 } 2711} 2712 2713void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2714 if (!D) 2715 return; 2716 2717 TemplateParameterList *Params = 0; 2718 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2719 Params = Template->getTemplateParameters(); 2720 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2721 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2722 Params = PartialSpec->getTemplateParameters(); 2723 else 2724 return; 2725 2726 for (TemplateParameterList::iterator Param = Params->begin(), 2727 ParamEnd = Params->end(); 2728 Param != ParamEnd; ++Param) { 2729 NamedDecl *Named = cast<NamedDecl>(*Param); 2730 if (Named->getDeclName()) { 2731 S->AddDecl(Named); 2732 IdResolver.AddDecl(Named); 2733 } 2734 } 2735} 2736 2737void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2738 if (!RecordD) return; 2739 AdjustDeclIfTemplate(RecordD); 2740 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2741 PushDeclContext(S, Record); 2742} 2743 2744void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2745 if (!RecordD) return; 2746 PopDeclContext(); 2747} 2748 2749/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2750/// parsing a top-level (non-nested) C++ class, and we are now 2751/// parsing those parts of the given Method declaration that could 2752/// not be parsed earlier (C++ [class.mem]p2), such as default 2753/// arguments. This action should enter the scope of the given 2754/// Method declaration as if we had just parsed the qualified method 2755/// name. However, it should not bring the parameters into scope; 2756/// that will be performed by ActOnDelayedCXXMethodParameter. 2757void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2758} 2759 2760/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2761/// C++ method declaration. We're (re-)introducing the given 2762/// function parameter into scope for use in parsing later parts of 2763/// the method declaration. For example, we could see an 2764/// ActOnParamDefaultArgument event for this parameter. 2765void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2766 if (!ParamD) 2767 return; 2768 2769 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2770 2771 // If this parameter has an unparsed default argument, clear it out 2772 // to make way for the parsed default argument. 2773 if (Param->hasUnparsedDefaultArg()) 2774 Param->setDefaultArg(0); 2775 2776 S->AddDecl(Param); 2777 if (Param->getDeclName()) 2778 IdResolver.AddDecl(Param); 2779} 2780 2781/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2782/// processing the delayed method declaration for Method. The method 2783/// declaration is now considered finished. There may be a separate 2784/// ActOnStartOfFunctionDef action later (not necessarily 2785/// immediately!) for this method, if it was also defined inside the 2786/// class body. 2787void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2788 if (!MethodD) 2789 return; 2790 2791 AdjustDeclIfTemplate(MethodD); 2792 2793 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2794 2795 // Now that we have our default arguments, check the constructor 2796 // again. It could produce additional diagnostics or affect whether 2797 // the class has implicitly-declared destructors, among other 2798 // things. 2799 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2800 CheckConstructor(Constructor); 2801 2802 // Check the default arguments, which we may have added. 2803 if (!Method->isInvalidDecl()) 2804 CheckCXXDefaultArguments(Method); 2805} 2806 2807/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2808/// the well-formedness of the constructor declarator @p D with type @p 2809/// R. If there are any errors in the declarator, this routine will 2810/// emit diagnostics and set the invalid bit to true. In any case, the type 2811/// will be updated to reflect a well-formed type for the constructor and 2812/// returned. 2813QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2814 StorageClass &SC) { 2815 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2816 2817 // C++ [class.ctor]p3: 2818 // A constructor shall not be virtual (10.3) or static (9.4). A 2819 // constructor can be invoked for a const, volatile or const 2820 // volatile object. A constructor shall not be declared const, 2821 // volatile, or const volatile (9.3.2). 2822 if (isVirtual) { 2823 if (!D.isInvalidType()) 2824 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2825 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2826 << SourceRange(D.getIdentifierLoc()); 2827 D.setInvalidType(); 2828 } 2829 if (SC == SC_Static) { 2830 if (!D.isInvalidType()) 2831 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2832 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2833 << SourceRange(D.getIdentifierLoc()); 2834 D.setInvalidType(); 2835 SC = SC_None; 2836 } 2837 2838 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2839 if (FTI.TypeQuals != 0) { 2840 if (FTI.TypeQuals & Qualifiers::Const) 2841 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2842 << "const" << SourceRange(D.getIdentifierLoc()); 2843 if (FTI.TypeQuals & Qualifiers::Volatile) 2844 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2845 << "volatile" << SourceRange(D.getIdentifierLoc()); 2846 if (FTI.TypeQuals & Qualifiers::Restrict) 2847 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2848 << "restrict" << SourceRange(D.getIdentifierLoc()); 2849 } 2850 2851 // Rebuild the function type "R" without any type qualifiers (in 2852 // case any of the errors above fired) and with "void" as the 2853 // return type, since constructors don't have return types. 2854 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2855 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2856 Proto->getNumArgs(), 2857 Proto->isVariadic(), 0, 2858 Proto->hasExceptionSpec(), 2859 Proto->hasAnyExceptionSpec(), 2860 Proto->getNumExceptions(), 2861 Proto->exception_begin(), 2862 Proto->getExtInfo()); 2863} 2864 2865/// CheckConstructor - Checks a fully-formed constructor for 2866/// well-formedness, issuing any diagnostics required. Returns true if 2867/// the constructor declarator is invalid. 2868void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2869 CXXRecordDecl *ClassDecl 2870 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2871 if (!ClassDecl) 2872 return Constructor->setInvalidDecl(); 2873 2874 // C++ [class.copy]p3: 2875 // A declaration of a constructor for a class X is ill-formed if 2876 // its first parameter is of type (optionally cv-qualified) X and 2877 // either there are no other parameters or else all other 2878 // parameters have default arguments. 2879 if (!Constructor->isInvalidDecl() && 2880 ((Constructor->getNumParams() == 1) || 2881 (Constructor->getNumParams() > 1 && 2882 Constructor->getParamDecl(1)->hasDefaultArg())) && 2883 Constructor->getTemplateSpecializationKind() 2884 != TSK_ImplicitInstantiation) { 2885 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2886 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2887 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2888 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2889 const char *ConstRef 2890 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2891 : " const &"; 2892 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2893 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2894 2895 // FIXME: Rather that making the constructor invalid, we should endeavor 2896 // to fix the type. 2897 Constructor->setInvalidDecl(); 2898 } 2899 } 2900} 2901 2902/// CheckDestructor - Checks a fully-formed destructor definition for 2903/// well-formedness, issuing any diagnostics required. Returns true 2904/// on error. 2905bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2906 CXXRecordDecl *RD = Destructor->getParent(); 2907 2908 if (Destructor->isVirtual()) { 2909 SourceLocation Loc; 2910 2911 if (!Destructor->isImplicit()) 2912 Loc = Destructor->getLocation(); 2913 else 2914 Loc = RD->getLocation(); 2915 2916 // If we have a virtual destructor, look up the deallocation function 2917 FunctionDecl *OperatorDelete = 0; 2918 DeclarationName Name = 2919 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2920 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2921 return true; 2922 2923 MarkDeclarationReferenced(Loc, OperatorDelete); 2924 2925 Destructor->setOperatorDelete(OperatorDelete); 2926 } 2927 2928 return false; 2929} 2930 2931static inline bool 2932FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2933 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2934 FTI.ArgInfo[0].Param && 2935 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 2936} 2937 2938/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2939/// the well-formednes of the destructor declarator @p D with type @p 2940/// R. If there are any errors in the declarator, this routine will 2941/// emit diagnostics and set the declarator to invalid. Even if this happens, 2942/// will be updated to reflect a well-formed type for the destructor and 2943/// returned. 2944QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2945 StorageClass& SC) { 2946 // C++ [class.dtor]p1: 2947 // [...] A typedef-name that names a class is a class-name 2948 // (7.1.3); however, a typedef-name that names a class shall not 2949 // be used as the identifier in the declarator for a destructor 2950 // declaration. 2951 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2952 if (isa<TypedefType>(DeclaratorType)) 2953 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2954 << DeclaratorType; 2955 2956 // C++ [class.dtor]p2: 2957 // A destructor is used to destroy objects of its class type. A 2958 // destructor takes no parameters, and no return type can be 2959 // specified for it (not even void). The address of a destructor 2960 // shall not be taken. A destructor shall not be static. A 2961 // destructor can be invoked for a const, volatile or const 2962 // volatile object. A destructor shall not be declared const, 2963 // volatile or const volatile (9.3.2). 2964 if (SC == SC_Static) { 2965 if (!D.isInvalidType()) 2966 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2967 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2968 << SourceRange(D.getIdentifierLoc()) 2969 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2970 2971 SC = SC_None; 2972 } 2973 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2974 // Destructors don't have return types, but the parser will 2975 // happily parse something like: 2976 // 2977 // class X { 2978 // float ~X(); 2979 // }; 2980 // 2981 // The return type will be eliminated later. 2982 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2983 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2984 << SourceRange(D.getIdentifierLoc()); 2985 } 2986 2987 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2988 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2989 if (FTI.TypeQuals & Qualifiers::Const) 2990 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2991 << "const" << SourceRange(D.getIdentifierLoc()); 2992 if (FTI.TypeQuals & Qualifiers::Volatile) 2993 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2994 << "volatile" << SourceRange(D.getIdentifierLoc()); 2995 if (FTI.TypeQuals & Qualifiers::Restrict) 2996 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2997 << "restrict" << SourceRange(D.getIdentifierLoc()); 2998 D.setInvalidType(); 2999 } 3000 3001 // Make sure we don't have any parameters. 3002 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3003 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3004 3005 // Delete the parameters. 3006 FTI.freeArgs(); 3007 D.setInvalidType(); 3008 } 3009 3010 // Make sure the destructor isn't variadic. 3011 if (FTI.isVariadic) { 3012 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3013 D.setInvalidType(); 3014 } 3015 3016 // Rebuild the function type "R" without any type qualifiers or 3017 // parameters (in case any of the errors above fired) and with 3018 // "void" as the return type, since destructors don't have return 3019 // types. 3020 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3021 if (!Proto) 3022 return QualType(); 3023 3024 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3025 Proto->hasExceptionSpec(), 3026 Proto->hasAnyExceptionSpec(), 3027 Proto->getNumExceptions(), 3028 Proto->exception_begin(), 3029 Proto->getExtInfo()); 3030} 3031 3032/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3033/// well-formednes of the conversion function declarator @p D with 3034/// type @p R. If there are any errors in the declarator, this routine 3035/// will emit diagnostics and return true. Otherwise, it will return 3036/// false. Either way, the type @p R will be updated to reflect a 3037/// well-formed type for the conversion operator. 3038void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3039 StorageClass& SC) { 3040 // C++ [class.conv.fct]p1: 3041 // Neither parameter types nor return type can be specified. The 3042 // type of a conversion function (8.3.5) is "function taking no 3043 // parameter returning conversion-type-id." 3044 if (SC == SC_Static) { 3045 if (!D.isInvalidType()) 3046 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3047 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3048 << SourceRange(D.getIdentifierLoc()); 3049 D.setInvalidType(); 3050 SC = SC_None; 3051 } 3052 3053 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3054 3055 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3056 // Conversion functions don't have return types, but the parser will 3057 // happily parse something like: 3058 // 3059 // class X { 3060 // float operator bool(); 3061 // }; 3062 // 3063 // The return type will be changed later anyway. 3064 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3065 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3066 << SourceRange(D.getIdentifierLoc()); 3067 D.setInvalidType(); 3068 } 3069 3070 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3071 3072 // Make sure we don't have any parameters. 3073 if (Proto->getNumArgs() > 0) { 3074 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3075 3076 // Delete the parameters. 3077 D.getTypeObject(0).Fun.freeArgs(); 3078 D.setInvalidType(); 3079 } else if (Proto->isVariadic()) { 3080 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3081 D.setInvalidType(); 3082 } 3083 3084 // Diagnose "&operator bool()" and other such nonsense. This 3085 // is actually a gcc extension which we don't support. 3086 if (Proto->getResultType() != ConvType) { 3087 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3088 << Proto->getResultType(); 3089 D.setInvalidType(); 3090 ConvType = Proto->getResultType(); 3091 } 3092 3093 // C++ [class.conv.fct]p4: 3094 // The conversion-type-id shall not represent a function type nor 3095 // an array type. 3096 if (ConvType->isArrayType()) { 3097 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3098 ConvType = Context.getPointerType(ConvType); 3099 D.setInvalidType(); 3100 } else if (ConvType->isFunctionType()) { 3101 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3102 ConvType = Context.getPointerType(ConvType); 3103 D.setInvalidType(); 3104 } 3105 3106 // Rebuild the function type "R" without any parameters (in case any 3107 // of the errors above fired) and with the conversion type as the 3108 // return type. 3109 if (D.isInvalidType()) { 3110 R = Context.getFunctionType(ConvType, 0, 0, false, 3111 Proto->getTypeQuals(), 3112 Proto->hasExceptionSpec(), 3113 Proto->hasAnyExceptionSpec(), 3114 Proto->getNumExceptions(), 3115 Proto->exception_begin(), 3116 Proto->getExtInfo()); 3117 } 3118 3119 // C++0x explicit conversion operators. 3120 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3121 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3122 diag::warn_explicit_conversion_functions) 3123 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3124} 3125 3126/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3127/// the declaration of the given C++ conversion function. This routine 3128/// is responsible for recording the conversion function in the C++ 3129/// class, if possible. 3130Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3131 assert(Conversion && "Expected to receive a conversion function declaration"); 3132 3133 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3134 3135 // Make sure we aren't redeclaring the conversion function. 3136 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3137 3138 // C++ [class.conv.fct]p1: 3139 // [...] A conversion function is never used to convert a 3140 // (possibly cv-qualified) object to the (possibly cv-qualified) 3141 // same object type (or a reference to it), to a (possibly 3142 // cv-qualified) base class of that type (or a reference to it), 3143 // or to (possibly cv-qualified) void. 3144 // FIXME: Suppress this warning if the conversion function ends up being a 3145 // virtual function that overrides a virtual function in a base class. 3146 QualType ClassType 3147 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3148 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3149 ConvType = ConvTypeRef->getPointeeType(); 3150 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3151 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3152 /* Suppress diagnostics for instantiations. */; 3153 else if (ConvType->isRecordType()) { 3154 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3155 if (ConvType == ClassType) 3156 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3157 << ClassType; 3158 else if (IsDerivedFrom(ClassType, ConvType)) 3159 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3160 << ClassType << ConvType; 3161 } else if (ConvType->isVoidType()) { 3162 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3163 << ClassType << ConvType; 3164 } 3165 3166 if (FunctionTemplateDecl *ConversionTemplate 3167 = Conversion->getDescribedFunctionTemplate()) 3168 return ConversionTemplate; 3169 3170 return Conversion; 3171} 3172 3173//===----------------------------------------------------------------------===// 3174// Namespace Handling 3175//===----------------------------------------------------------------------===// 3176 3177 3178 3179/// ActOnStartNamespaceDef - This is called at the start of a namespace 3180/// definition. 3181Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3182 SourceLocation InlineLoc, 3183 SourceLocation IdentLoc, 3184 IdentifierInfo *II, 3185 SourceLocation LBrace, 3186 AttributeList *AttrList) { 3187 // anonymous namespace starts at its left brace 3188 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3189 (II ? IdentLoc : LBrace) , II); 3190 Namespc->setLBracLoc(LBrace); 3191 Namespc->setInline(InlineLoc.isValid()); 3192 3193 Scope *DeclRegionScope = NamespcScope->getParent(); 3194 3195 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3196 3197 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3198 PushVisibilityAttr(attr); 3199 3200 if (II) { 3201 // C++ [namespace.def]p2: 3202 // The identifier in an original-namespace-definition shall not 3203 // have been previously defined in the declarative region in 3204 // which the original-namespace-definition appears. The 3205 // identifier in an original-namespace-definition is the name of 3206 // the namespace. Subsequently in that declarative region, it is 3207 // treated as an original-namespace-name. 3208 // 3209 // Since namespace names are unique in their scope, and we don't 3210 // look through using directives, just 3211 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3212 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3213 3214 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3215 // This is an extended namespace definition. 3216 if (Namespc->isInline() != OrigNS->isInline()) { 3217 // inline-ness must match 3218 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3219 << Namespc->isInline(); 3220 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3221 Namespc->setInvalidDecl(); 3222 // Recover by ignoring the new namespace's inline status. 3223 Namespc->setInline(OrigNS->isInline()); 3224 } 3225 3226 // Attach this namespace decl to the chain of extended namespace 3227 // definitions. 3228 OrigNS->setNextNamespace(Namespc); 3229 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3230 3231 // Remove the previous declaration from the scope. 3232 if (DeclRegionScope->isDeclScope(OrigNS)) { 3233 IdResolver.RemoveDecl(OrigNS); 3234 DeclRegionScope->RemoveDecl(OrigNS); 3235 } 3236 } else if (PrevDecl) { 3237 // This is an invalid name redefinition. 3238 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3239 << Namespc->getDeclName(); 3240 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3241 Namespc->setInvalidDecl(); 3242 // Continue on to push Namespc as current DeclContext and return it. 3243 } else if (II->isStr("std") && 3244 CurContext->getRedeclContext()->isTranslationUnit()) { 3245 // This is the first "real" definition of the namespace "std", so update 3246 // our cache of the "std" namespace to point at this definition. 3247 if (NamespaceDecl *StdNS = getStdNamespace()) { 3248 // We had already defined a dummy namespace "std". Link this new 3249 // namespace definition to the dummy namespace "std". 3250 StdNS->setNextNamespace(Namespc); 3251 StdNS->setLocation(IdentLoc); 3252 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3253 } 3254 3255 // Make our StdNamespace cache point at the first real definition of the 3256 // "std" namespace. 3257 StdNamespace = Namespc; 3258 } 3259 3260 PushOnScopeChains(Namespc, DeclRegionScope); 3261 } else { 3262 // Anonymous namespaces. 3263 assert(Namespc->isAnonymousNamespace()); 3264 3265 // Link the anonymous namespace into its parent. 3266 NamespaceDecl *PrevDecl; 3267 DeclContext *Parent = CurContext->getRedeclContext(); 3268 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3269 PrevDecl = TU->getAnonymousNamespace(); 3270 TU->setAnonymousNamespace(Namespc); 3271 } else { 3272 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3273 PrevDecl = ND->getAnonymousNamespace(); 3274 ND->setAnonymousNamespace(Namespc); 3275 } 3276 3277 // Link the anonymous namespace with its previous declaration. 3278 if (PrevDecl) { 3279 assert(PrevDecl->isAnonymousNamespace()); 3280 assert(!PrevDecl->getNextNamespace()); 3281 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3282 PrevDecl->setNextNamespace(Namespc); 3283 3284 if (Namespc->isInline() != PrevDecl->isInline()) { 3285 // inline-ness must match 3286 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3287 << Namespc->isInline(); 3288 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3289 Namespc->setInvalidDecl(); 3290 // Recover by ignoring the new namespace's inline status. 3291 Namespc->setInline(PrevDecl->isInline()); 3292 } 3293 } 3294 3295 CurContext->addDecl(Namespc); 3296 3297 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3298 // behaves as if it were replaced by 3299 // namespace unique { /* empty body */ } 3300 // using namespace unique; 3301 // namespace unique { namespace-body } 3302 // where all occurrences of 'unique' in a translation unit are 3303 // replaced by the same identifier and this identifier differs 3304 // from all other identifiers in the entire program. 3305 3306 // We just create the namespace with an empty name and then add an 3307 // implicit using declaration, just like the standard suggests. 3308 // 3309 // CodeGen enforces the "universally unique" aspect by giving all 3310 // declarations semantically contained within an anonymous 3311 // namespace internal linkage. 3312 3313 if (!PrevDecl) { 3314 UsingDirectiveDecl* UD 3315 = UsingDirectiveDecl::Create(Context, CurContext, 3316 /* 'using' */ LBrace, 3317 /* 'namespace' */ SourceLocation(), 3318 /* qualifier */ SourceRange(), 3319 /* NNS */ NULL, 3320 /* identifier */ SourceLocation(), 3321 Namespc, 3322 /* Ancestor */ CurContext); 3323 UD->setImplicit(); 3324 CurContext->addDecl(UD); 3325 } 3326 } 3327 3328 // Although we could have an invalid decl (i.e. the namespace name is a 3329 // redefinition), push it as current DeclContext and try to continue parsing. 3330 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3331 // for the namespace has the declarations that showed up in that particular 3332 // namespace definition. 3333 PushDeclContext(NamespcScope, Namespc); 3334 return Namespc; 3335} 3336 3337/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3338/// is a namespace alias, returns the namespace it points to. 3339static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3340 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3341 return AD->getNamespace(); 3342 return dyn_cast_or_null<NamespaceDecl>(D); 3343} 3344 3345/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3346/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3347void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3348 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3349 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3350 Namespc->setRBracLoc(RBrace); 3351 PopDeclContext(); 3352 if (Namespc->hasAttr<VisibilityAttr>()) 3353 PopPragmaVisibility(); 3354} 3355 3356CXXRecordDecl *Sema::getStdBadAlloc() const { 3357 return cast_or_null<CXXRecordDecl>( 3358 StdBadAlloc.get(Context.getExternalSource())); 3359} 3360 3361NamespaceDecl *Sema::getStdNamespace() const { 3362 return cast_or_null<NamespaceDecl>( 3363 StdNamespace.get(Context.getExternalSource())); 3364} 3365 3366/// \brief Retrieve the special "std" namespace, which may require us to 3367/// implicitly define the namespace. 3368NamespaceDecl *Sema::getOrCreateStdNamespace() { 3369 if (!StdNamespace) { 3370 // The "std" namespace has not yet been defined, so build one implicitly. 3371 StdNamespace = NamespaceDecl::Create(Context, 3372 Context.getTranslationUnitDecl(), 3373 SourceLocation(), 3374 &PP.getIdentifierTable().get("std")); 3375 getStdNamespace()->setImplicit(true); 3376 } 3377 3378 return getStdNamespace(); 3379} 3380 3381Decl *Sema::ActOnUsingDirective(Scope *S, 3382 SourceLocation UsingLoc, 3383 SourceLocation NamespcLoc, 3384 CXXScopeSpec &SS, 3385 SourceLocation IdentLoc, 3386 IdentifierInfo *NamespcName, 3387 AttributeList *AttrList) { 3388 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3389 assert(NamespcName && "Invalid NamespcName."); 3390 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3391 3392 // This can only happen along a recovery path. 3393 while (S->getFlags() & Scope::TemplateParamScope) 3394 S = S->getParent(); 3395 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3396 3397 UsingDirectiveDecl *UDir = 0; 3398 NestedNameSpecifier *Qualifier = 0; 3399 if (SS.isSet()) 3400 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3401 3402 // Lookup namespace name. 3403 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3404 LookupParsedName(R, S, &SS); 3405 if (R.isAmbiguous()) 3406 return 0; 3407 3408 if (R.empty()) { 3409 // Allow "using namespace std;" or "using namespace ::std;" even if 3410 // "std" hasn't been defined yet, for GCC compatibility. 3411 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3412 NamespcName->isStr("std")) { 3413 Diag(IdentLoc, diag::ext_using_undefined_std); 3414 R.addDecl(getOrCreateStdNamespace()); 3415 R.resolveKind(); 3416 } 3417 // Otherwise, attempt typo correction. 3418 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3419 CTC_NoKeywords, 0)) { 3420 if (R.getAsSingle<NamespaceDecl>() || 3421 R.getAsSingle<NamespaceAliasDecl>()) { 3422 if (DeclContext *DC = computeDeclContext(SS, false)) 3423 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3424 << NamespcName << DC << Corrected << SS.getRange() 3425 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3426 else 3427 Diag(IdentLoc, diag::err_using_directive_suggest) 3428 << NamespcName << Corrected 3429 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3430 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3431 << Corrected; 3432 3433 NamespcName = Corrected.getAsIdentifierInfo(); 3434 } else { 3435 R.clear(); 3436 R.setLookupName(NamespcName); 3437 } 3438 } 3439 } 3440 3441 if (!R.empty()) { 3442 NamedDecl *Named = R.getFoundDecl(); 3443 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3444 && "expected namespace decl"); 3445 // C++ [namespace.udir]p1: 3446 // A using-directive specifies that the names in the nominated 3447 // namespace can be used in the scope in which the 3448 // using-directive appears after the using-directive. During 3449 // unqualified name lookup (3.4.1), the names appear as if they 3450 // were declared in the nearest enclosing namespace which 3451 // contains both the using-directive and the nominated 3452 // namespace. [Note: in this context, "contains" means "contains 3453 // directly or indirectly". ] 3454 3455 // Find enclosing context containing both using-directive and 3456 // nominated namespace. 3457 NamespaceDecl *NS = getNamespaceDecl(Named); 3458 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3459 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3460 CommonAncestor = CommonAncestor->getParent(); 3461 3462 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3463 SS.getRange(), 3464 (NestedNameSpecifier *)SS.getScopeRep(), 3465 IdentLoc, Named, CommonAncestor); 3466 PushUsingDirective(S, UDir); 3467 } else { 3468 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3469 } 3470 3471 // FIXME: We ignore attributes for now. 3472 return UDir; 3473} 3474 3475void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3476 // If scope has associated entity, then using directive is at namespace 3477 // or translation unit scope. We add UsingDirectiveDecls, into 3478 // it's lookup structure. 3479 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3480 Ctx->addDecl(UDir); 3481 else 3482 // Otherwise it is block-sope. using-directives will affect lookup 3483 // only to the end of scope. 3484 S->PushUsingDirective(UDir); 3485} 3486 3487 3488Decl *Sema::ActOnUsingDeclaration(Scope *S, 3489 AccessSpecifier AS, 3490 bool HasUsingKeyword, 3491 SourceLocation UsingLoc, 3492 CXXScopeSpec &SS, 3493 UnqualifiedId &Name, 3494 AttributeList *AttrList, 3495 bool IsTypeName, 3496 SourceLocation TypenameLoc) { 3497 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3498 3499 switch (Name.getKind()) { 3500 case UnqualifiedId::IK_Identifier: 3501 case UnqualifiedId::IK_OperatorFunctionId: 3502 case UnqualifiedId::IK_LiteralOperatorId: 3503 case UnqualifiedId::IK_ConversionFunctionId: 3504 break; 3505 3506 case UnqualifiedId::IK_ConstructorName: 3507 case UnqualifiedId::IK_ConstructorTemplateId: 3508 // C++0x inherited constructors. 3509 if (getLangOptions().CPlusPlus0x) break; 3510 3511 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3512 << SS.getRange(); 3513 return 0; 3514 3515 case UnqualifiedId::IK_DestructorName: 3516 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3517 << SS.getRange(); 3518 return 0; 3519 3520 case UnqualifiedId::IK_TemplateId: 3521 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3522 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3523 return 0; 3524 } 3525 3526 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3527 DeclarationName TargetName = TargetNameInfo.getName(); 3528 if (!TargetName) 3529 return 0; 3530 3531 // Warn about using declarations. 3532 // TODO: store that the declaration was written without 'using' and 3533 // talk about access decls instead of using decls in the 3534 // diagnostics. 3535 if (!HasUsingKeyword) { 3536 UsingLoc = Name.getSourceRange().getBegin(); 3537 3538 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3539 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3540 } 3541 3542 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3543 TargetNameInfo, AttrList, 3544 /* IsInstantiation */ false, 3545 IsTypeName, TypenameLoc); 3546 if (UD) 3547 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3548 3549 return UD; 3550} 3551 3552/// \brief Determine whether a using declaration considers the given 3553/// declarations as "equivalent", e.g., if they are redeclarations of 3554/// the same entity or are both typedefs of the same type. 3555static bool 3556IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3557 bool &SuppressRedeclaration) { 3558 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3559 SuppressRedeclaration = false; 3560 return true; 3561 } 3562 3563 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3564 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3565 SuppressRedeclaration = true; 3566 return Context.hasSameType(TD1->getUnderlyingType(), 3567 TD2->getUnderlyingType()); 3568 } 3569 3570 return false; 3571} 3572 3573 3574/// Determines whether to create a using shadow decl for a particular 3575/// decl, given the set of decls existing prior to this using lookup. 3576bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3577 const LookupResult &Previous) { 3578 // Diagnose finding a decl which is not from a base class of the 3579 // current class. We do this now because there are cases where this 3580 // function will silently decide not to build a shadow decl, which 3581 // will pre-empt further diagnostics. 3582 // 3583 // We don't need to do this in C++0x because we do the check once on 3584 // the qualifier. 3585 // 3586 // FIXME: diagnose the following if we care enough: 3587 // struct A { int foo; }; 3588 // struct B : A { using A::foo; }; 3589 // template <class T> struct C : A {}; 3590 // template <class T> struct D : C<T> { using B::foo; } // <--- 3591 // This is invalid (during instantiation) in C++03 because B::foo 3592 // resolves to the using decl in B, which is not a base class of D<T>. 3593 // We can't diagnose it immediately because C<T> is an unknown 3594 // specialization. The UsingShadowDecl in D<T> then points directly 3595 // to A::foo, which will look well-formed when we instantiate. 3596 // The right solution is to not collapse the shadow-decl chain. 3597 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3598 DeclContext *OrigDC = Orig->getDeclContext(); 3599 3600 // Handle enums and anonymous structs. 3601 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3602 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3603 while (OrigRec->isAnonymousStructOrUnion()) 3604 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3605 3606 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3607 if (OrigDC == CurContext) { 3608 Diag(Using->getLocation(), 3609 diag::err_using_decl_nested_name_specifier_is_current_class) 3610 << Using->getNestedNameRange(); 3611 Diag(Orig->getLocation(), diag::note_using_decl_target); 3612 return true; 3613 } 3614 3615 Diag(Using->getNestedNameRange().getBegin(), 3616 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3617 << Using->getTargetNestedNameDecl() 3618 << cast<CXXRecordDecl>(CurContext) 3619 << Using->getNestedNameRange(); 3620 Diag(Orig->getLocation(), diag::note_using_decl_target); 3621 return true; 3622 } 3623 } 3624 3625 if (Previous.empty()) return false; 3626 3627 NamedDecl *Target = Orig; 3628 if (isa<UsingShadowDecl>(Target)) 3629 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3630 3631 // If the target happens to be one of the previous declarations, we 3632 // don't have a conflict. 3633 // 3634 // FIXME: but we might be increasing its access, in which case we 3635 // should redeclare it. 3636 NamedDecl *NonTag = 0, *Tag = 0; 3637 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3638 I != E; ++I) { 3639 NamedDecl *D = (*I)->getUnderlyingDecl(); 3640 bool Result; 3641 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3642 return Result; 3643 3644 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3645 } 3646 3647 if (Target->isFunctionOrFunctionTemplate()) { 3648 FunctionDecl *FD; 3649 if (isa<FunctionTemplateDecl>(Target)) 3650 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3651 else 3652 FD = cast<FunctionDecl>(Target); 3653 3654 NamedDecl *OldDecl = 0; 3655 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3656 case Ovl_Overload: 3657 return false; 3658 3659 case Ovl_NonFunction: 3660 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3661 break; 3662 3663 // We found a decl with the exact signature. 3664 case Ovl_Match: 3665 // If we're in a record, we want to hide the target, so we 3666 // return true (without a diagnostic) to tell the caller not to 3667 // build a shadow decl. 3668 if (CurContext->isRecord()) 3669 return true; 3670 3671 // If we're not in a record, this is an error. 3672 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3673 break; 3674 } 3675 3676 Diag(Target->getLocation(), diag::note_using_decl_target); 3677 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3678 return true; 3679 } 3680 3681 // Target is not a function. 3682 3683 if (isa<TagDecl>(Target)) { 3684 // No conflict between a tag and a non-tag. 3685 if (!Tag) return false; 3686 3687 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3688 Diag(Target->getLocation(), diag::note_using_decl_target); 3689 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3690 return true; 3691 } 3692 3693 // No conflict between a tag and a non-tag. 3694 if (!NonTag) return false; 3695 3696 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3697 Diag(Target->getLocation(), diag::note_using_decl_target); 3698 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3699 return true; 3700} 3701 3702/// Builds a shadow declaration corresponding to a 'using' declaration. 3703UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3704 UsingDecl *UD, 3705 NamedDecl *Orig) { 3706 3707 // If we resolved to another shadow declaration, just coalesce them. 3708 NamedDecl *Target = Orig; 3709 if (isa<UsingShadowDecl>(Target)) { 3710 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3711 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3712 } 3713 3714 UsingShadowDecl *Shadow 3715 = UsingShadowDecl::Create(Context, CurContext, 3716 UD->getLocation(), UD, Target); 3717 UD->addShadowDecl(Shadow); 3718 3719 Shadow->setAccess(UD->getAccess()); 3720 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3721 Shadow->setInvalidDecl(); 3722 3723 if (S) 3724 PushOnScopeChains(Shadow, S); 3725 else 3726 CurContext->addDecl(Shadow); 3727 3728 3729 return Shadow; 3730} 3731 3732/// Hides a using shadow declaration. This is required by the current 3733/// using-decl implementation when a resolvable using declaration in a 3734/// class is followed by a declaration which would hide or override 3735/// one or more of the using decl's targets; for example: 3736/// 3737/// struct Base { void foo(int); }; 3738/// struct Derived : Base { 3739/// using Base::foo; 3740/// void foo(int); 3741/// }; 3742/// 3743/// The governing language is C++03 [namespace.udecl]p12: 3744/// 3745/// When a using-declaration brings names from a base class into a 3746/// derived class scope, member functions in the derived class 3747/// override and/or hide member functions with the same name and 3748/// parameter types in a base class (rather than conflicting). 3749/// 3750/// There are two ways to implement this: 3751/// (1) optimistically create shadow decls when they're not hidden 3752/// by existing declarations, or 3753/// (2) don't create any shadow decls (or at least don't make them 3754/// visible) until we've fully parsed/instantiated the class. 3755/// The problem with (1) is that we might have to retroactively remove 3756/// a shadow decl, which requires several O(n) operations because the 3757/// decl structures are (very reasonably) not designed for removal. 3758/// (2) avoids this but is very fiddly and phase-dependent. 3759void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3760 if (Shadow->getDeclName().getNameKind() == 3761 DeclarationName::CXXConversionFunctionName) 3762 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3763 3764 // Remove it from the DeclContext... 3765 Shadow->getDeclContext()->removeDecl(Shadow); 3766 3767 // ...and the scope, if applicable... 3768 if (S) { 3769 S->RemoveDecl(Shadow); 3770 IdResolver.RemoveDecl(Shadow); 3771 } 3772 3773 // ...and the using decl. 3774 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3775 3776 // TODO: complain somehow if Shadow was used. It shouldn't 3777 // be possible for this to happen, because...? 3778} 3779 3780/// Builds a using declaration. 3781/// 3782/// \param IsInstantiation - Whether this call arises from an 3783/// instantiation of an unresolved using declaration. We treat 3784/// the lookup differently for these declarations. 3785NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3786 SourceLocation UsingLoc, 3787 CXXScopeSpec &SS, 3788 const DeclarationNameInfo &NameInfo, 3789 AttributeList *AttrList, 3790 bool IsInstantiation, 3791 bool IsTypeName, 3792 SourceLocation TypenameLoc) { 3793 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3794 SourceLocation IdentLoc = NameInfo.getLoc(); 3795 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3796 3797 // FIXME: We ignore attributes for now. 3798 3799 if (SS.isEmpty()) { 3800 Diag(IdentLoc, diag::err_using_requires_qualname); 3801 return 0; 3802 } 3803 3804 // Do the redeclaration lookup in the current scope. 3805 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3806 ForRedeclaration); 3807 Previous.setHideTags(false); 3808 if (S) { 3809 LookupName(Previous, S); 3810 3811 // It is really dumb that we have to do this. 3812 LookupResult::Filter F = Previous.makeFilter(); 3813 while (F.hasNext()) { 3814 NamedDecl *D = F.next(); 3815 if (!isDeclInScope(D, CurContext, S)) 3816 F.erase(); 3817 } 3818 F.done(); 3819 } else { 3820 assert(IsInstantiation && "no scope in non-instantiation"); 3821 assert(CurContext->isRecord() && "scope not record in instantiation"); 3822 LookupQualifiedName(Previous, CurContext); 3823 } 3824 3825 NestedNameSpecifier *NNS = 3826 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3827 3828 // Check for invalid redeclarations. 3829 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3830 return 0; 3831 3832 // Check for bad qualifiers. 3833 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3834 return 0; 3835 3836 DeclContext *LookupContext = computeDeclContext(SS); 3837 NamedDecl *D; 3838 if (!LookupContext) { 3839 if (IsTypeName) { 3840 // FIXME: not all declaration name kinds are legal here 3841 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3842 UsingLoc, TypenameLoc, 3843 SS.getRange(), NNS, 3844 IdentLoc, NameInfo.getName()); 3845 } else { 3846 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3847 UsingLoc, SS.getRange(), 3848 NNS, NameInfo); 3849 } 3850 } else { 3851 D = UsingDecl::Create(Context, CurContext, 3852 SS.getRange(), UsingLoc, NNS, NameInfo, 3853 IsTypeName); 3854 } 3855 D->setAccess(AS); 3856 CurContext->addDecl(D); 3857 3858 if (!LookupContext) return D; 3859 UsingDecl *UD = cast<UsingDecl>(D); 3860 3861 if (RequireCompleteDeclContext(SS, LookupContext)) { 3862 UD->setInvalidDecl(); 3863 return UD; 3864 } 3865 3866 // Look up the target name. 3867 3868 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3869 3870 // Unlike most lookups, we don't always want to hide tag 3871 // declarations: tag names are visible through the using declaration 3872 // even if hidden by ordinary names, *except* in a dependent context 3873 // where it's important for the sanity of two-phase lookup. 3874 if (!IsInstantiation) 3875 R.setHideTags(false); 3876 3877 LookupQualifiedName(R, LookupContext); 3878 3879 if (R.empty()) { 3880 Diag(IdentLoc, diag::err_no_member) 3881 << NameInfo.getName() << LookupContext << SS.getRange(); 3882 UD->setInvalidDecl(); 3883 return UD; 3884 } 3885 3886 if (R.isAmbiguous()) { 3887 UD->setInvalidDecl(); 3888 return UD; 3889 } 3890 3891 if (IsTypeName) { 3892 // If we asked for a typename and got a non-type decl, error out. 3893 if (!R.getAsSingle<TypeDecl>()) { 3894 Diag(IdentLoc, diag::err_using_typename_non_type); 3895 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3896 Diag((*I)->getUnderlyingDecl()->getLocation(), 3897 diag::note_using_decl_target); 3898 UD->setInvalidDecl(); 3899 return UD; 3900 } 3901 } else { 3902 // If we asked for a non-typename and we got a type, error out, 3903 // but only if this is an instantiation of an unresolved using 3904 // decl. Otherwise just silently find the type name. 3905 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3906 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3907 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3908 UD->setInvalidDecl(); 3909 return UD; 3910 } 3911 } 3912 3913 // C++0x N2914 [namespace.udecl]p6: 3914 // A using-declaration shall not name a namespace. 3915 if (R.getAsSingle<NamespaceDecl>()) { 3916 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3917 << SS.getRange(); 3918 UD->setInvalidDecl(); 3919 return UD; 3920 } 3921 3922 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3923 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3924 BuildUsingShadowDecl(S, UD, *I); 3925 } 3926 3927 return UD; 3928} 3929 3930/// Checks that the given using declaration is not an invalid 3931/// redeclaration. Note that this is checking only for the using decl 3932/// itself, not for any ill-formedness among the UsingShadowDecls. 3933bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3934 bool isTypeName, 3935 const CXXScopeSpec &SS, 3936 SourceLocation NameLoc, 3937 const LookupResult &Prev) { 3938 // C++03 [namespace.udecl]p8: 3939 // C++0x [namespace.udecl]p10: 3940 // A using-declaration is a declaration and can therefore be used 3941 // repeatedly where (and only where) multiple declarations are 3942 // allowed. 3943 // 3944 // That's in non-member contexts. 3945 if (!CurContext->getRedeclContext()->isRecord()) 3946 return false; 3947 3948 NestedNameSpecifier *Qual 3949 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3950 3951 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3952 NamedDecl *D = *I; 3953 3954 bool DTypename; 3955 NestedNameSpecifier *DQual; 3956 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3957 DTypename = UD->isTypeName(); 3958 DQual = UD->getTargetNestedNameDecl(); 3959 } else if (UnresolvedUsingValueDecl *UD 3960 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3961 DTypename = false; 3962 DQual = UD->getTargetNestedNameSpecifier(); 3963 } else if (UnresolvedUsingTypenameDecl *UD 3964 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3965 DTypename = true; 3966 DQual = UD->getTargetNestedNameSpecifier(); 3967 } else continue; 3968 3969 // using decls differ if one says 'typename' and the other doesn't. 3970 // FIXME: non-dependent using decls? 3971 if (isTypeName != DTypename) continue; 3972 3973 // using decls differ if they name different scopes (but note that 3974 // template instantiation can cause this check to trigger when it 3975 // didn't before instantiation). 3976 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3977 Context.getCanonicalNestedNameSpecifier(DQual)) 3978 continue; 3979 3980 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3981 Diag(D->getLocation(), diag::note_using_decl) << 1; 3982 return true; 3983 } 3984 3985 return false; 3986} 3987 3988 3989/// Checks that the given nested-name qualifier used in a using decl 3990/// in the current context is appropriately related to the current 3991/// scope. If an error is found, diagnoses it and returns true. 3992bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3993 const CXXScopeSpec &SS, 3994 SourceLocation NameLoc) { 3995 DeclContext *NamedContext = computeDeclContext(SS); 3996 3997 if (!CurContext->isRecord()) { 3998 // C++03 [namespace.udecl]p3: 3999 // C++0x [namespace.udecl]p8: 4000 // A using-declaration for a class member shall be a member-declaration. 4001 4002 // If we weren't able to compute a valid scope, it must be a 4003 // dependent class scope. 4004 if (!NamedContext || NamedContext->isRecord()) { 4005 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4006 << SS.getRange(); 4007 return true; 4008 } 4009 4010 // Otherwise, everything is known to be fine. 4011 return false; 4012 } 4013 4014 // The current scope is a record. 4015 4016 // If the named context is dependent, we can't decide much. 4017 if (!NamedContext) { 4018 // FIXME: in C++0x, we can diagnose if we can prove that the 4019 // nested-name-specifier does not refer to a base class, which is 4020 // still possible in some cases. 4021 4022 // Otherwise we have to conservatively report that things might be 4023 // okay. 4024 return false; 4025 } 4026 4027 if (!NamedContext->isRecord()) { 4028 // Ideally this would point at the last name in the specifier, 4029 // but we don't have that level of source info. 4030 Diag(SS.getRange().getBegin(), 4031 diag::err_using_decl_nested_name_specifier_is_not_class) 4032 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4033 return true; 4034 } 4035 4036 if (getLangOptions().CPlusPlus0x) { 4037 // C++0x [namespace.udecl]p3: 4038 // In a using-declaration used as a member-declaration, the 4039 // nested-name-specifier shall name a base class of the class 4040 // being defined. 4041 4042 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4043 cast<CXXRecordDecl>(NamedContext))) { 4044 if (CurContext == NamedContext) { 4045 Diag(NameLoc, 4046 diag::err_using_decl_nested_name_specifier_is_current_class) 4047 << SS.getRange(); 4048 return true; 4049 } 4050 4051 Diag(SS.getRange().getBegin(), 4052 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4053 << (NestedNameSpecifier*) SS.getScopeRep() 4054 << cast<CXXRecordDecl>(CurContext) 4055 << SS.getRange(); 4056 return true; 4057 } 4058 4059 return false; 4060 } 4061 4062 // C++03 [namespace.udecl]p4: 4063 // A using-declaration used as a member-declaration shall refer 4064 // to a member of a base class of the class being defined [etc.]. 4065 4066 // Salient point: SS doesn't have to name a base class as long as 4067 // lookup only finds members from base classes. Therefore we can 4068 // diagnose here only if we can prove that that can't happen, 4069 // i.e. if the class hierarchies provably don't intersect. 4070 4071 // TODO: it would be nice if "definitely valid" results were cached 4072 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4073 // need to be repeated. 4074 4075 struct UserData { 4076 llvm::DenseSet<const CXXRecordDecl*> Bases; 4077 4078 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4079 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4080 Data->Bases.insert(Base); 4081 return true; 4082 } 4083 4084 bool hasDependentBases(const CXXRecordDecl *Class) { 4085 return !Class->forallBases(collect, this); 4086 } 4087 4088 /// Returns true if the base is dependent or is one of the 4089 /// accumulated base classes. 4090 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4091 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4092 return !Data->Bases.count(Base); 4093 } 4094 4095 bool mightShareBases(const CXXRecordDecl *Class) { 4096 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4097 } 4098 }; 4099 4100 UserData Data; 4101 4102 // Returns false if we find a dependent base. 4103 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4104 return false; 4105 4106 // Returns false if the class has a dependent base or if it or one 4107 // of its bases is present in the base set of the current context. 4108 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4109 return false; 4110 4111 Diag(SS.getRange().getBegin(), 4112 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4113 << (NestedNameSpecifier*) SS.getScopeRep() 4114 << cast<CXXRecordDecl>(CurContext) 4115 << SS.getRange(); 4116 4117 return true; 4118} 4119 4120Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4121 SourceLocation NamespaceLoc, 4122 SourceLocation AliasLoc, 4123 IdentifierInfo *Alias, 4124 CXXScopeSpec &SS, 4125 SourceLocation IdentLoc, 4126 IdentifierInfo *Ident) { 4127 4128 // Lookup the namespace name. 4129 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4130 LookupParsedName(R, S, &SS); 4131 4132 // Check if we have a previous declaration with the same name. 4133 NamedDecl *PrevDecl 4134 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4135 ForRedeclaration); 4136 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4137 PrevDecl = 0; 4138 4139 if (PrevDecl) { 4140 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4141 // We already have an alias with the same name that points to the same 4142 // namespace, so don't create a new one. 4143 // FIXME: At some point, we'll want to create the (redundant) 4144 // declaration to maintain better source information. 4145 if (!R.isAmbiguous() && !R.empty() && 4146 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4147 return 0; 4148 } 4149 4150 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4151 diag::err_redefinition_different_kind; 4152 Diag(AliasLoc, DiagID) << Alias; 4153 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4154 return 0; 4155 } 4156 4157 if (R.isAmbiguous()) 4158 return 0; 4159 4160 if (R.empty()) { 4161 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4162 CTC_NoKeywords, 0)) { 4163 if (R.getAsSingle<NamespaceDecl>() || 4164 R.getAsSingle<NamespaceAliasDecl>()) { 4165 if (DeclContext *DC = computeDeclContext(SS, false)) 4166 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4167 << Ident << DC << Corrected << SS.getRange() 4168 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4169 else 4170 Diag(IdentLoc, diag::err_using_directive_suggest) 4171 << Ident << Corrected 4172 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4173 4174 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4175 << Corrected; 4176 4177 Ident = Corrected.getAsIdentifierInfo(); 4178 } else { 4179 R.clear(); 4180 R.setLookupName(Ident); 4181 } 4182 } 4183 4184 if (R.empty()) { 4185 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4186 return 0; 4187 } 4188 } 4189 4190 NamespaceAliasDecl *AliasDecl = 4191 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4192 Alias, SS.getRange(), 4193 (NestedNameSpecifier *)SS.getScopeRep(), 4194 IdentLoc, R.getFoundDecl()); 4195 4196 PushOnScopeChains(AliasDecl, S); 4197 return AliasDecl; 4198} 4199 4200namespace { 4201 /// \brief Scoped object used to handle the state changes required in Sema 4202 /// to implicitly define the body of a C++ member function; 4203 class ImplicitlyDefinedFunctionScope { 4204 Sema &S; 4205 DeclContext *PreviousContext; 4206 4207 public: 4208 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4209 : S(S), PreviousContext(S.CurContext) 4210 { 4211 S.CurContext = Method; 4212 S.PushFunctionScope(); 4213 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4214 } 4215 4216 ~ImplicitlyDefinedFunctionScope() { 4217 S.PopExpressionEvaluationContext(); 4218 S.PopFunctionOrBlockScope(); 4219 S.CurContext = PreviousContext; 4220 } 4221 }; 4222} 4223 4224static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4225 CXXRecordDecl *D) { 4226 ASTContext &Context = Self.Context; 4227 QualType ClassType = Context.getTypeDeclType(D); 4228 DeclarationName ConstructorName 4229 = Context.DeclarationNames.getCXXConstructorName( 4230 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4231 4232 DeclContext::lookup_const_iterator Con, ConEnd; 4233 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4234 Con != ConEnd; ++Con) { 4235 // FIXME: In C++0x, a constructor template can be a default constructor. 4236 if (isa<FunctionTemplateDecl>(*Con)) 4237 continue; 4238 4239 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4240 if (Constructor->isDefaultConstructor()) 4241 return Constructor; 4242 } 4243 return 0; 4244} 4245 4246CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4247 CXXRecordDecl *ClassDecl) { 4248 // C++ [class.ctor]p5: 4249 // A default constructor for a class X is a constructor of class X 4250 // that can be called without an argument. If there is no 4251 // user-declared constructor for class X, a default constructor is 4252 // implicitly declared. An implicitly-declared default constructor 4253 // is an inline public member of its class. 4254 assert(!ClassDecl->hasUserDeclaredConstructor() && 4255 "Should not build implicit default constructor!"); 4256 4257 // C++ [except.spec]p14: 4258 // An implicitly declared special member function (Clause 12) shall have an 4259 // exception-specification. [...] 4260 ImplicitExceptionSpecification ExceptSpec(Context); 4261 4262 // Direct base-class destructors. 4263 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4264 BEnd = ClassDecl->bases_end(); 4265 B != BEnd; ++B) { 4266 if (B->isVirtual()) // Handled below. 4267 continue; 4268 4269 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4270 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4271 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4272 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4273 else if (CXXConstructorDecl *Constructor 4274 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4275 ExceptSpec.CalledDecl(Constructor); 4276 } 4277 } 4278 4279 // Virtual base-class destructors. 4280 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4281 BEnd = ClassDecl->vbases_end(); 4282 B != BEnd; ++B) { 4283 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4284 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4285 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4286 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4287 else if (CXXConstructorDecl *Constructor 4288 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4289 ExceptSpec.CalledDecl(Constructor); 4290 } 4291 } 4292 4293 // Field destructors. 4294 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4295 FEnd = ClassDecl->field_end(); 4296 F != FEnd; ++F) { 4297 if (const RecordType *RecordTy 4298 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4299 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4300 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4301 ExceptSpec.CalledDecl( 4302 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4303 else if (CXXConstructorDecl *Constructor 4304 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4305 ExceptSpec.CalledDecl(Constructor); 4306 } 4307 } 4308 4309 4310 // Create the actual constructor declaration. 4311 CanQualType ClassType 4312 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4313 DeclarationName Name 4314 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4315 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4316 CXXConstructorDecl *DefaultCon 4317 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4318 Context.getFunctionType(Context.VoidTy, 4319 0, 0, false, 0, 4320 ExceptSpec.hasExceptionSpecification(), 4321 ExceptSpec.hasAnyExceptionSpecification(), 4322 ExceptSpec.size(), 4323 ExceptSpec.data(), 4324 FunctionType::ExtInfo()), 4325 /*TInfo=*/0, 4326 /*isExplicit=*/false, 4327 /*isInline=*/true, 4328 /*isImplicitlyDeclared=*/true); 4329 DefaultCon->setAccess(AS_public); 4330 DefaultCon->setImplicit(); 4331 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4332 4333 // Note that we have declared this constructor. 4334 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4335 4336 if (Scope *S = getScopeForContext(ClassDecl)) 4337 PushOnScopeChains(DefaultCon, S, false); 4338 ClassDecl->addDecl(DefaultCon); 4339 4340 return DefaultCon; 4341} 4342 4343void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4344 CXXConstructorDecl *Constructor) { 4345 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4346 !Constructor->isUsed(false)) && 4347 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4348 4349 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4350 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4351 4352 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4353 DiagnosticErrorTrap Trap(Diags); 4354 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4355 Trap.hasErrorOccurred()) { 4356 Diag(CurrentLocation, diag::note_member_synthesized_at) 4357 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4358 Constructor->setInvalidDecl(); 4359 return; 4360 } 4361 4362 SourceLocation Loc = Constructor->getLocation(); 4363 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4364 4365 Constructor->setUsed(); 4366 MarkVTableUsed(CurrentLocation, ClassDecl); 4367} 4368 4369CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4370 // C++ [class.dtor]p2: 4371 // If a class has no user-declared destructor, a destructor is 4372 // declared implicitly. An implicitly-declared destructor is an 4373 // inline public member of its class. 4374 4375 // C++ [except.spec]p14: 4376 // An implicitly declared special member function (Clause 12) shall have 4377 // an exception-specification. 4378 ImplicitExceptionSpecification ExceptSpec(Context); 4379 4380 // Direct base-class destructors. 4381 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4382 BEnd = ClassDecl->bases_end(); 4383 B != BEnd; ++B) { 4384 if (B->isVirtual()) // Handled below. 4385 continue; 4386 4387 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4388 ExceptSpec.CalledDecl( 4389 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4390 } 4391 4392 // Virtual base-class destructors. 4393 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4394 BEnd = ClassDecl->vbases_end(); 4395 B != BEnd; ++B) { 4396 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4397 ExceptSpec.CalledDecl( 4398 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4399 } 4400 4401 // Field destructors. 4402 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4403 FEnd = ClassDecl->field_end(); 4404 F != FEnd; ++F) { 4405 if (const RecordType *RecordTy 4406 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4407 ExceptSpec.CalledDecl( 4408 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4409 } 4410 4411 // Create the actual destructor declaration. 4412 QualType Ty = Context.getFunctionType(Context.VoidTy, 4413 0, 0, false, 0, 4414 ExceptSpec.hasExceptionSpecification(), 4415 ExceptSpec.hasAnyExceptionSpecification(), 4416 ExceptSpec.size(), 4417 ExceptSpec.data(), 4418 FunctionType::ExtInfo()); 4419 4420 CanQualType ClassType 4421 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4422 DeclarationName Name 4423 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4424 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4425 CXXDestructorDecl *Destructor 4426 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4427 /*isInline=*/true, 4428 /*isImplicitlyDeclared=*/true); 4429 Destructor->setAccess(AS_public); 4430 Destructor->setImplicit(); 4431 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4432 4433 // Note that we have declared this destructor. 4434 ++ASTContext::NumImplicitDestructorsDeclared; 4435 4436 // Introduce this destructor into its scope. 4437 if (Scope *S = getScopeForContext(ClassDecl)) 4438 PushOnScopeChains(Destructor, S, false); 4439 ClassDecl->addDecl(Destructor); 4440 4441 // This could be uniqued if it ever proves significant. 4442 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4443 4444 AddOverriddenMethods(ClassDecl, Destructor); 4445 4446 return Destructor; 4447} 4448 4449void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4450 CXXDestructorDecl *Destructor) { 4451 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4452 "DefineImplicitDestructor - call it for implicit default dtor"); 4453 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4454 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4455 4456 if (Destructor->isInvalidDecl()) 4457 return; 4458 4459 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4460 4461 DiagnosticErrorTrap Trap(Diags); 4462 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4463 Destructor->getParent()); 4464 4465 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4466 Diag(CurrentLocation, diag::note_member_synthesized_at) 4467 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4468 4469 Destructor->setInvalidDecl(); 4470 return; 4471 } 4472 4473 SourceLocation Loc = Destructor->getLocation(); 4474 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4475 4476 Destructor->setUsed(); 4477 MarkVTableUsed(CurrentLocation, ClassDecl); 4478} 4479 4480/// \brief Builds a statement that copies the given entity from \p From to 4481/// \c To. 4482/// 4483/// This routine is used to copy the members of a class with an 4484/// implicitly-declared copy assignment operator. When the entities being 4485/// copied are arrays, this routine builds for loops to copy them. 4486/// 4487/// \param S The Sema object used for type-checking. 4488/// 4489/// \param Loc The location where the implicit copy is being generated. 4490/// 4491/// \param T The type of the expressions being copied. Both expressions must 4492/// have this type. 4493/// 4494/// \param To The expression we are copying to. 4495/// 4496/// \param From The expression we are copying from. 4497/// 4498/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4499/// Otherwise, it's a non-static member subobject. 4500/// 4501/// \param Depth Internal parameter recording the depth of the recursion. 4502/// 4503/// \returns A statement or a loop that copies the expressions. 4504static StmtResult 4505BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4506 Expr *To, Expr *From, 4507 bool CopyingBaseSubobject, unsigned Depth = 0) { 4508 // C++0x [class.copy]p30: 4509 // Each subobject is assigned in the manner appropriate to its type: 4510 // 4511 // - if the subobject is of class type, the copy assignment operator 4512 // for the class is used (as if by explicit qualification; that is, 4513 // ignoring any possible virtual overriding functions in more derived 4514 // classes); 4515 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4516 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4517 4518 // Look for operator=. 4519 DeclarationName Name 4520 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4521 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4522 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4523 4524 // Filter out any result that isn't a copy-assignment operator. 4525 LookupResult::Filter F = OpLookup.makeFilter(); 4526 while (F.hasNext()) { 4527 NamedDecl *D = F.next(); 4528 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4529 if (Method->isCopyAssignmentOperator()) 4530 continue; 4531 4532 F.erase(); 4533 } 4534 F.done(); 4535 4536 // Suppress the protected check (C++ [class.protected]) for each of the 4537 // assignment operators we found. This strange dance is required when 4538 // we're assigning via a base classes's copy-assignment operator. To 4539 // ensure that we're getting the right base class subobject (without 4540 // ambiguities), we need to cast "this" to that subobject type; to 4541 // ensure that we don't go through the virtual call mechanism, we need 4542 // to qualify the operator= name with the base class (see below). However, 4543 // this means that if the base class has a protected copy assignment 4544 // operator, the protected member access check will fail. So, we 4545 // rewrite "protected" access to "public" access in this case, since we 4546 // know by construction that we're calling from a derived class. 4547 if (CopyingBaseSubobject) { 4548 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4549 L != LEnd; ++L) { 4550 if (L.getAccess() == AS_protected) 4551 L.setAccess(AS_public); 4552 } 4553 } 4554 4555 // Create the nested-name-specifier that will be used to qualify the 4556 // reference to operator=; this is required to suppress the virtual 4557 // call mechanism. 4558 CXXScopeSpec SS; 4559 SS.setRange(Loc); 4560 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4561 T.getTypePtr())); 4562 4563 // Create the reference to operator=. 4564 ExprResult OpEqualRef 4565 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4566 /*FirstQualifierInScope=*/0, OpLookup, 4567 /*TemplateArgs=*/0, 4568 /*SuppressQualifierCheck=*/true); 4569 if (OpEqualRef.isInvalid()) 4570 return StmtError(); 4571 4572 // Build the call to the assignment operator. 4573 4574 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4575 OpEqualRef.takeAs<Expr>(), 4576 Loc, &From, 1, Loc); 4577 if (Call.isInvalid()) 4578 return StmtError(); 4579 4580 return S.Owned(Call.takeAs<Stmt>()); 4581 } 4582 4583 // - if the subobject is of scalar type, the built-in assignment 4584 // operator is used. 4585 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4586 if (!ArrayTy) { 4587 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4588 if (Assignment.isInvalid()) 4589 return StmtError(); 4590 4591 return S.Owned(Assignment.takeAs<Stmt>()); 4592 } 4593 4594 // - if the subobject is an array, each element is assigned, in the 4595 // manner appropriate to the element type; 4596 4597 // Construct a loop over the array bounds, e.g., 4598 // 4599 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4600 // 4601 // that will copy each of the array elements. 4602 QualType SizeType = S.Context.getSizeType(); 4603 4604 // Create the iteration variable. 4605 IdentifierInfo *IterationVarName = 0; 4606 { 4607 llvm::SmallString<8> Str; 4608 llvm::raw_svector_ostream OS(Str); 4609 OS << "__i" << Depth; 4610 IterationVarName = &S.Context.Idents.get(OS.str()); 4611 } 4612 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4613 IterationVarName, SizeType, 4614 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4615 SC_None, SC_None); 4616 4617 // Initialize the iteration variable to zero. 4618 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4619 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4620 4621 // Create a reference to the iteration variable; we'll use this several 4622 // times throughout. 4623 Expr *IterationVarRef 4624 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 4625 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4626 4627 // Create the DeclStmt that holds the iteration variable. 4628 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4629 4630 // Create the comparison against the array bound. 4631 llvm::APInt Upper 4632 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 4633 Expr *Comparison 4634 = new (S.Context) BinaryOperator(IterationVarRef, 4635 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 4636 BO_NE, S.Context.BoolTy, 4637 VK_RValue, OK_Ordinary, Loc); 4638 4639 // Create the pre-increment of the iteration variable. 4640 Expr *Increment 4641 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 4642 VK_LValue, OK_Ordinary, Loc); 4643 4644 // Subscript the "from" and "to" expressions with the iteration variable. 4645 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4646 IterationVarRef, Loc)); 4647 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4648 IterationVarRef, Loc)); 4649 4650 // Build the copy for an individual element of the array. 4651 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 4652 To, From, CopyingBaseSubobject, 4653 Depth + 1); 4654 if (Copy.isInvalid()) 4655 return StmtError(); 4656 4657 // Construct the loop that copies all elements of this array. 4658 return S.ActOnForStmt(Loc, Loc, InitStmt, 4659 S.MakeFullExpr(Comparison), 4660 0, S.MakeFullExpr(Increment), 4661 Loc, Copy.take()); 4662} 4663 4664/// \brief Determine whether the given class has a copy assignment operator 4665/// that accepts a const-qualified argument. 4666static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4667 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4668 4669 if (!Class->hasDeclaredCopyAssignment()) 4670 S.DeclareImplicitCopyAssignment(Class); 4671 4672 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4673 DeclarationName OpName 4674 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4675 4676 DeclContext::lookup_const_iterator Op, OpEnd; 4677 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4678 // C++ [class.copy]p9: 4679 // A user-declared copy assignment operator is a non-static non-template 4680 // member function of class X with exactly one parameter of type X, X&, 4681 // const X&, volatile X& or const volatile X&. 4682 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4683 if (!Method) 4684 continue; 4685 4686 if (Method->isStatic()) 4687 continue; 4688 if (Method->getPrimaryTemplate()) 4689 continue; 4690 const FunctionProtoType *FnType = 4691 Method->getType()->getAs<FunctionProtoType>(); 4692 assert(FnType && "Overloaded operator has no prototype."); 4693 // Don't assert on this; an invalid decl might have been left in the AST. 4694 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4695 continue; 4696 bool AcceptsConst = true; 4697 QualType ArgType = FnType->getArgType(0); 4698 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4699 ArgType = Ref->getPointeeType(); 4700 // Is it a non-const lvalue reference? 4701 if (!ArgType.isConstQualified()) 4702 AcceptsConst = false; 4703 } 4704 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4705 continue; 4706 4707 // We have a single argument of type cv X or cv X&, i.e. we've found the 4708 // copy assignment operator. Return whether it accepts const arguments. 4709 return AcceptsConst; 4710 } 4711 assert(Class->isInvalidDecl() && 4712 "No copy assignment operator declared in valid code."); 4713 return false; 4714} 4715 4716CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4717 // Note: The following rules are largely analoguous to the copy 4718 // constructor rules. Note that virtual bases are not taken into account 4719 // for determining the argument type of the operator. Note also that 4720 // operators taking an object instead of a reference are allowed. 4721 4722 4723 // C++ [class.copy]p10: 4724 // If the class definition does not explicitly declare a copy 4725 // assignment operator, one is declared implicitly. 4726 // The implicitly-defined copy assignment operator for a class X 4727 // will have the form 4728 // 4729 // X& X::operator=(const X&) 4730 // 4731 // if 4732 bool HasConstCopyAssignment = true; 4733 4734 // -- each direct base class B of X has a copy assignment operator 4735 // whose parameter is of type const B&, const volatile B& or B, 4736 // and 4737 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4738 BaseEnd = ClassDecl->bases_end(); 4739 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4740 assert(!Base->getType()->isDependentType() && 4741 "Cannot generate implicit members for class with dependent bases."); 4742 const CXXRecordDecl *BaseClassDecl 4743 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4744 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4745 } 4746 4747 // -- for all the nonstatic data members of X that are of a class 4748 // type M (or array thereof), each such class type has a copy 4749 // assignment operator whose parameter is of type const M&, 4750 // const volatile M& or M. 4751 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4752 FieldEnd = ClassDecl->field_end(); 4753 HasConstCopyAssignment && Field != FieldEnd; 4754 ++Field) { 4755 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4756 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4757 const CXXRecordDecl *FieldClassDecl 4758 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4759 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4760 } 4761 } 4762 4763 // Otherwise, the implicitly declared copy assignment operator will 4764 // have the form 4765 // 4766 // X& X::operator=(X&) 4767 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4768 QualType RetType = Context.getLValueReferenceType(ArgType); 4769 if (HasConstCopyAssignment) 4770 ArgType = ArgType.withConst(); 4771 ArgType = Context.getLValueReferenceType(ArgType); 4772 4773 // C++ [except.spec]p14: 4774 // An implicitly declared special member function (Clause 12) shall have an 4775 // exception-specification. [...] 4776 ImplicitExceptionSpecification ExceptSpec(Context); 4777 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4778 BaseEnd = ClassDecl->bases_end(); 4779 Base != BaseEnd; ++Base) { 4780 CXXRecordDecl *BaseClassDecl 4781 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4782 4783 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4784 DeclareImplicitCopyAssignment(BaseClassDecl); 4785 4786 if (CXXMethodDecl *CopyAssign 4787 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4788 ExceptSpec.CalledDecl(CopyAssign); 4789 } 4790 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4791 FieldEnd = ClassDecl->field_end(); 4792 Field != FieldEnd; 4793 ++Field) { 4794 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4795 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4796 CXXRecordDecl *FieldClassDecl 4797 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4798 4799 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4800 DeclareImplicitCopyAssignment(FieldClassDecl); 4801 4802 if (CXXMethodDecl *CopyAssign 4803 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4804 ExceptSpec.CalledDecl(CopyAssign); 4805 } 4806 } 4807 4808 // An implicitly-declared copy assignment operator is an inline public 4809 // member of its class. 4810 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4811 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4812 CXXMethodDecl *CopyAssignment 4813 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4814 Context.getFunctionType(RetType, &ArgType, 1, 4815 false, 0, 4816 ExceptSpec.hasExceptionSpecification(), 4817 ExceptSpec.hasAnyExceptionSpecification(), 4818 ExceptSpec.size(), 4819 ExceptSpec.data(), 4820 FunctionType::ExtInfo()), 4821 /*TInfo=*/0, /*isStatic=*/false, 4822 /*StorageClassAsWritten=*/SC_None, 4823 /*isInline=*/true); 4824 CopyAssignment->setAccess(AS_public); 4825 CopyAssignment->setImplicit(); 4826 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4827 4828 // Add the parameter to the operator. 4829 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4830 ClassDecl->getLocation(), 4831 /*Id=*/0, 4832 ArgType, /*TInfo=*/0, 4833 SC_None, 4834 SC_None, 0); 4835 CopyAssignment->setParams(&FromParam, 1); 4836 4837 // Note that we have added this copy-assignment operator. 4838 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4839 4840 if (Scope *S = getScopeForContext(ClassDecl)) 4841 PushOnScopeChains(CopyAssignment, S, false); 4842 ClassDecl->addDecl(CopyAssignment); 4843 4844 AddOverriddenMethods(ClassDecl, CopyAssignment); 4845 return CopyAssignment; 4846} 4847 4848void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4849 CXXMethodDecl *CopyAssignOperator) { 4850 assert((CopyAssignOperator->isImplicit() && 4851 CopyAssignOperator->isOverloadedOperator() && 4852 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4853 !CopyAssignOperator->isUsed(false)) && 4854 "DefineImplicitCopyAssignment called for wrong function"); 4855 4856 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4857 4858 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4859 CopyAssignOperator->setInvalidDecl(); 4860 return; 4861 } 4862 4863 CopyAssignOperator->setUsed(); 4864 4865 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4866 DiagnosticErrorTrap Trap(Diags); 4867 4868 // C++0x [class.copy]p30: 4869 // The implicitly-defined or explicitly-defaulted copy assignment operator 4870 // for a non-union class X performs memberwise copy assignment of its 4871 // subobjects. The direct base classes of X are assigned first, in the 4872 // order of their declaration in the base-specifier-list, and then the 4873 // immediate non-static data members of X are assigned, in the order in 4874 // which they were declared in the class definition. 4875 4876 // The statements that form the synthesized function body. 4877 ASTOwningVector<Stmt*> Statements(*this); 4878 4879 // The parameter for the "other" object, which we are copying from. 4880 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4881 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4882 QualType OtherRefType = Other->getType(); 4883 if (const LValueReferenceType *OtherRef 4884 = OtherRefType->getAs<LValueReferenceType>()) { 4885 OtherRefType = OtherRef->getPointeeType(); 4886 OtherQuals = OtherRefType.getQualifiers(); 4887 } 4888 4889 // Our location for everything implicitly-generated. 4890 SourceLocation Loc = CopyAssignOperator->getLocation(); 4891 4892 // Construct a reference to the "other" object. We'll be using this 4893 // throughout the generated ASTs. 4894 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 4895 assert(OtherRef && "Reference to parameter cannot fail!"); 4896 4897 // Construct the "this" pointer. We'll be using this throughout the generated 4898 // ASTs. 4899 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4900 assert(This && "Reference to this cannot fail!"); 4901 4902 // Assign base classes. 4903 bool Invalid = false; 4904 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4905 E = ClassDecl->bases_end(); Base != E; ++Base) { 4906 // Form the assignment: 4907 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4908 QualType BaseType = Base->getType().getUnqualifiedType(); 4909 CXXRecordDecl *BaseClassDecl = 0; 4910 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4911 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4912 else { 4913 Invalid = true; 4914 continue; 4915 } 4916 4917 CXXCastPath BasePath; 4918 BasePath.push_back(Base); 4919 4920 // Construct the "from" expression, which is an implicit cast to the 4921 // appropriately-qualified base type. 4922 Expr *From = OtherRef; 4923 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4924 CK_UncheckedDerivedToBase, 4925 VK_LValue, &BasePath); 4926 4927 // Dereference "this". 4928 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4929 4930 // Implicitly cast "this" to the appropriately-qualified base type. 4931 Expr *ToE = To.takeAs<Expr>(); 4932 ImpCastExprToType(ToE, 4933 Context.getCVRQualifiedType(BaseType, 4934 CopyAssignOperator->getTypeQualifiers()), 4935 CK_UncheckedDerivedToBase, 4936 VK_LValue, &BasePath); 4937 To = Owned(ToE); 4938 4939 // Build the copy. 4940 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4941 To.get(), From, 4942 /*CopyingBaseSubobject=*/true); 4943 if (Copy.isInvalid()) { 4944 Diag(CurrentLocation, diag::note_member_synthesized_at) 4945 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4946 CopyAssignOperator->setInvalidDecl(); 4947 return; 4948 } 4949 4950 // Success! Record the copy. 4951 Statements.push_back(Copy.takeAs<Expr>()); 4952 } 4953 4954 // \brief Reference to the __builtin_memcpy function. 4955 Expr *BuiltinMemCpyRef = 0; 4956 // \brief Reference to the __builtin_objc_memmove_collectable function. 4957 Expr *CollectableMemCpyRef = 0; 4958 4959 // Assign non-static members. 4960 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4961 FieldEnd = ClassDecl->field_end(); 4962 Field != FieldEnd; ++Field) { 4963 // Check for members of reference type; we can't copy those. 4964 if (Field->getType()->isReferenceType()) { 4965 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4966 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4967 Diag(Field->getLocation(), diag::note_declared_at); 4968 Diag(CurrentLocation, diag::note_member_synthesized_at) 4969 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4970 Invalid = true; 4971 continue; 4972 } 4973 4974 // Check for members of const-qualified, non-class type. 4975 QualType BaseType = Context.getBaseElementType(Field->getType()); 4976 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4977 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4978 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4979 Diag(Field->getLocation(), diag::note_declared_at); 4980 Diag(CurrentLocation, diag::note_member_synthesized_at) 4981 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4982 Invalid = true; 4983 continue; 4984 } 4985 4986 QualType FieldType = Field->getType().getNonReferenceType(); 4987 if (FieldType->isIncompleteArrayType()) { 4988 assert(ClassDecl->hasFlexibleArrayMember() && 4989 "Incomplete array type is not valid"); 4990 continue; 4991 } 4992 4993 // Build references to the field in the object we're copying from and to. 4994 CXXScopeSpec SS; // Intentionally empty 4995 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4996 LookupMemberName); 4997 MemberLookup.addDecl(*Field); 4998 MemberLookup.resolveKind(); 4999 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5000 Loc, /*IsArrow=*/false, 5001 SS, 0, MemberLookup, 0); 5002 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5003 Loc, /*IsArrow=*/true, 5004 SS, 0, MemberLookup, 0); 5005 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5006 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5007 5008 // If the field should be copied with __builtin_memcpy rather than via 5009 // explicit assignments, do so. This optimization only applies for arrays 5010 // of scalars and arrays of class type with trivial copy-assignment 5011 // operators. 5012 if (FieldType->isArrayType() && 5013 (!BaseType->isRecordType() || 5014 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5015 ->hasTrivialCopyAssignment())) { 5016 // Compute the size of the memory buffer to be copied. 5017 QualType SizeType = Context.getSizeType(); 5018 llvm::APInt Size(Context.getTypeSize(SizeType), 5019 Context.getTypeSizeInChars(BaseType).getQuantity()); 5020 for (const ConstantArrayType *Array 5021 = Context.getAsConstantArrayType(FieldType); 5022 Array; 5023 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5024 llvm::APInt ArraySize 5025 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5026 Size *= ArraySize; 5027 } 5028 5029 // Take the address of the field references for "from" and "to". 5030 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5031 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5032 5033 bool NeedsCollectableMemCpy = 5034 (BaseType->isRecordType() && 5035 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5036 5037 if (NeedsCollectableMemCpy) { 5038 if (!CollectableMemCpyRef) { 5039 // Create a reference to the __builtin_objc_memmove_collectable function. 5040 LookupResult R(*this, 5041 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5042 Loc, LookupOrdinaryName); 5043 LookupName(R, TUScope, true); 5044 5045 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5046 if (!CollectableMemCpy) { 5047 // Something went horribly wrong earlier, and we will have 5048 // complained about it. 5049 Invalid = true; 5050 continue; 5051 } 5052 5053 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5054 CollectableMemCpy->getType(), 5055 VK_LValue, Loc, 0).take(); 5056 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5057 } 5058 } 5059 // Create a reference to the __builtin_memcpy builtin function. 5060 else if (!BuiltinMemCpyRef) { 5061 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5062 LookupOrdinaryName); 5063 LookupName(R, TUScope, true); 5064 5065 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5066 if (!BuiltinMemCpy) { 5067 // Something went horribly wrong earlier, and we will have complained 5068 // about it. 5069 Invalid = true; 5070 continue; 5071 } 5072 5073 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5074 BuiltinMemCpy->getType(), 5075 VK_LValue, Loc, 0).take(); 5076 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5077 } 5078 5079 ASTOwningVector<Expr*> CallArgs(*this); 5080 CallArgs.push_back(To.takeAs<Expr>()); 5081 CallArgs.push_back(From.takeAs<Expr>()); 5082 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5083 ExprResult Call = ExprError(); 5084 if (NeedsCollectableMemCpy) 5085 Call = ActOnCallExpr(/*Scope=*/0, 5086 CollectableMemCpyRef, 5087 Loc, move_arg(CallArgs), 5088 Loc); 5089 else 5090 Call = ActOnCallExpr(/*Scope=*/0, 5091 BuiltinMemCpyRef, 5092 Loc, move_arg(CallArgs), 5093 Loc); 5094 5095 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5096 Statements.push_back(Call.takeAs<Expr>()); 5097 continue; 5098 } 5099 5100 // Build the copy of this field. 5101 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5102 To.get(), From.get(), 5103 /*CopyingBaseSubobject=*/false); 5104 if (Copy.isInvalid()) { 5105 Diag(CurrentLocation, diag::note_member_synthesized_at) 5106 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5107 CopyAssignOperator->setInvalidDecl(); 5108 return; 5109 } 5110 5111 // Success! Record the copy. 5112 Statements.push_back(Copy.takeAs<Stmt>()); 5113 } 5114 5115 if (!Invalid) { 5116 // Add a "return *this;" 5117 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5118 5119 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5120 if (Return.isInvalid()) 5121 Invalid = true; 5122 else { 5123 Statements.push_back(Return.takeAs<Stmt>()); 5124 5125 if (Trap.hasErrorOccurred()) { 5126 Diag(CurrentLocation, diag::note_member_synthesized_at) 5127 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5128 Invalid = true; 5129 } 5130 } 5131 } 5132 5133 if (Invalid) { 5134 CopyAssignOperator->setInvalidDecl(); 5135 return; 5136 } 5137 5138 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5139 /*isStmtExpr=*/false); 5140 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5141 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5142} 5143 5144CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5145 CXXRecordDecl *ClassDecl) { 5146 // C++ [class.copy]p4: 5147 // If the class definition does not explicitly declare a copy 5148 // constructor, one is declared implicitly. 5149 5150 // C++ [class.copy]p5: 5151 // The implicitly-declared copy constructor for a class X will 5152 // have the form 5153 // 5154 // X::X(const X&) 5155 // 5156 // if 5157 bool HasConstCopyConstructor = true; 5158 5159 // -- each direct or virtual base class B of X has a copy 5160 // constructor whose first parameter is of type const B& or 5161 // const volatile B&, and 5162 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5163 BaseEnd = ClassDecl->bases_end(); 5164 HasConstCopyConstructor && Base != BaseEnd; 5165 ++Base) { 5166 // Virtual bases are handled below. 5167 if (Base->isVirtual()) 5168 continue; 5169 5170 CXXRecordDecl *BaseClassDecl 5171 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5172 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5173 DeclareImplicitCopyConstructor(BaseClassDecl); 5174 5175 HasConstCopyConstructor 5176 = BaseClassDecl->hasConstCopyConstructor(Context); 5177 } 5178 5179 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5180 BaseEnd = ClassDecl->vbases_end(); 5181 HasConstCopyConstructor && Base != BaseEnd; 5182 ++Base) { 5183 CXXRecordDecl *BaseClassDecl 5184 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5185 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5186 DeclareImplicitCopyConstructor(BaseClassDecl); 5187 5188 HasConstCopyConstructor 5189 = BaseClassDecl->hasConstCopyConstructor(Context); 5190 } 5191 5192 // -- for all the nonstatic data members of X that are of a 5193 // class type M (or array thereof), each such class type 5194 // has a copy constructor whose first parameter is of type 5195 // const M& or const volatile M&. 5196 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5197 FieldEnd = ClassDecl->field_end(); 5198 HasConstCopyConstructor && Field != FieldEnd; 5199 ++Field) { 5200 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5201 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5202 CXXRecordDecl *FieldClassDecl 5203 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5204 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5205 DeclareImplicitCopyConstructor(FieldClassDecl); 5206 5207 HasConstCopyConstructor 5208 = FieldClassDecl->hasConstCopyConstructor(Context); 5209 } 5210 } 5211 5212 // Otherwise, the implicitly declared copy constructor will have 5213 // the form 5214 // 5215 // X::X(X&) 5216 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5217 QualType ArgType = ClassType; 5218 if (HasConstCopyConstructor) 5219 ArgType = ArgType.withConst(); 5220 ArgType = Context.getLValueReferenceType(ArgType); 5221 5222 // C++ [except.spec]p14: 5223 // An implicitly declared special member function (Clause 12) shall have an 5224 // exception-specification. [...] 5225 ImplicitExceptionSpecification ExceptSpec(Context); 5226 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5227 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5228 BaseEnd = ClassDecl->bases_end(); 5229 Base != BaseEnd; 5230 ++Base) { 5231 // Virtual bases are handled below. 5232 if (Base->isVirtual()) 5233 continue; 5234 5235 CXXRecordDecl *BaseClassDecl 5236 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5237 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5238 DeclareImplicitCopyConstructor(BaseClassDecl); 5239 5240 if (CXXConstructorDecl *CopyConstructor 5241 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5242 ExceptSpec.CalledDecl(CopyConstructor); 5243 } 5244 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5245 BaseEnd = ClassDecl->vbases_end(); 5246 Base != BaseEnd; 5247 ++Base) { 5248 CXXRecordDecl *BaseClassDecl 5249 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5250 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5251 DeclareImplicitCopyConstructor(BaseClassDecl); 5252 5253 if (CXXConstructorDecl *CopyConstructor 5254 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5255 ExceptSpec.CalledDecl(CopyConstructor); 5256 } 5257 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5258 FieldEnd = ClassDecl->field_end(); 5259 Field != FieldEnd; 5260 ++Field) { 5261 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5262 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5263 CXXRecordDecl *FieldClassDecl 5264 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5265 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5266 DeclareImplicitCopyConstructor(FieldClassDecl); 5267 5268 if (CXXConstructorDecl *CopyConstructor 5269 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5270 ExceptSpec.CalledDecl(CopyConstructor); 5271 } 5272 } 5273 5274 // An implicitly-declared copy constructor is an inline public 5275 // member of its class. 5276 DeclarationName Name 5277 = Context.DeclarationNames.getCXXConstructorName( 5278 Context.getCanonicalType(ClassType)); 5279 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5280 CXXConstructorDecl *CopyConstructor 5281 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5282 Context.getFunctionType(Context.VoidTy, 5283 &ArgType, 1, 5284 false, 0, 5285 ExceptSpec.hasExceptionSpecification(), 5286 ExceptSpec.hasAnyExceptionSpecification(), 5287 ExceptSpec.size(), 5288 ExceptSpec.data(), 5289 FunctionType::ExtInfo()), 5290 /*TInfo=*/0, 5291 /*isExplicit=*/false, 5292 /*isInline=*/true, 5293 /*isImplicitlyDeclared=*/true); 5294 CopyConstructor->setAccess(AS_public); 5295 CopyConstructor->setImplicit(); 5296 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5297 5298 // Note that we have declared this constructor. 5299 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5300 5301 // Add the parameter to the constructor. 5302 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5303 ClassDecl->getLocation(), 5304 /*IdentifierInfo=*/0, 5305 ArgType, /*TInfo=*/0, 5306 SC_None, 5307 SC_None, 0); 5308 CopyConstructor->setParams(&FromParam, 1); 5309 if (Scope *S = getScopeForContext(ClassDecl)) 5310 PushOnScopeChains(CopyConstructor, S, false); 5311 ClassDecl->addDecl(CopyConstructor); 5312 5313 return CopyConstructor; 5314} 5315 5316void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5317 CXXConstructorDecl *CopyConstructor, 5318 unsigned TypeQuals) { 5319 assert((CopyConstructor->isImplicit() && 5320 CopyConstructor->isCopyConstructor(TypeQuals) && 5321 !CopyConstructor->isUsed(false)) && 5322 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5323 5324 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5325 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5326 5327 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5328 DiagnosticErrorTrap Trap(Diags); 5329 5330 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5331 Trap.hasErrorOccurred()) { 5332 Diag(CurrentLocation, diag::note_member_synthesized_at) 5333 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5334 CopyConstructor->setInvalidDecl(); 5335 } else { 5336 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5337 CopyConstructor->getLocation(), 5338 MultiStmtArg(*this, 0, 0), 5339 /*isStmtExpr=*/false) 5340 .takeAs<Stmt>()); 5341 } 5342 5343 CopyConstructor->setUsed(); 5344} 5345 5346ExprResult 5347Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5348 CXXConstructorDecl *Constructor, 5349 MultiExprArg ExprArgs, 5350 bool RequiresZeroInit, 5351 unsigned ConstructKind, 5352 SourceRange ParenRange) { 5353 bool Elidable = false; 5354 5355 // C++0x [class.copy]p34: 5356 // When certain criteria are met, an implementation is allowed to 5357 // omit the copy/move construction of a class object, even if the 5358 // copy/move constructor and/or destructor for the object have 5359 // side effects. [...] 5360 // - when a temporary class object that has not been bound to a 5361 // reference (12.2) would be copied/moved to a class object 5362 // with the same cv-unqualified type, the copy/move operation 5363 // can be omitted by constructing the temporary object 5364 // directly into the target of the omitted copy/move 5365 if (ConstructKind == CXXConstructExpr::CK_Complete && 5366 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5367 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5368 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5369 } 5370 5371 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5372 Elidable, move(ExprArgs), RequiresZeroInit, 5373 ConstructKind, ParenRange); 5374} 5375 5376/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5377/// including handling of its default argument expressions. 5378ExprResult 5379Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5380 CXXConstructorDecl *Constructor, bool Elidable, 5381 MultiExprArg ExprArgs, 5382 bool RequiresZeroInit, 5383 unsigned ConstructKind, 5384 SourceRange ParenRange) { 5385 unsigned NumExprs = ExprArgs.size(); 5386 Expr **Exprs = (Expr **)ExprArgs.release(); 5387 5388 MarkDeclarationReferenced(ConstructLoc, Constructor); 5389 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5390 Constructor, Elidable, Exprs, NumExprs, 5391 RequiresZeroInit, 5392 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5393 ParenRange)); 5394} 5395 5396bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5397 CXXConstructorDecl *Constructor, 5398 MultiExprArg Exprs) { 5399 // FIXME: Provide the correct paren SourceRange when available. 5400 ExprResult TempResult = 5401 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5402 move(Exprs), false, CXXConstructExpr::CK_Complete, 5403 SourceRange()); 5404 if (TempResult.isInvalid()) 5405 return true; 5406 5407 Expr *Temp = TempResult.takeAs<Expr>(); 5408 CheckImplicitConversions(Temp, VD->getLocation()); 5409 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5410 Temp = MaybeCreateExprWithCleanups(Temp); 5411 VD->setInit(Temp); 5412 5413 return false; 5414} 5415 5416void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5417 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5418 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5419 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5420 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5421 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5422 CheckDestructorAccess(VD->getLocation(), Destructor, 5423 PDiag(diag::err_access_dtor_var) 5424 << VD->getDeclName() 5425 << VD->getType()); 5426 5427 // TODO: this should be re-enabled for static locals by !CXAAtExit 5428 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5429 Diag(VD->getLocation(), diag::warn_global_destructor); 5430 } 5431} 5432 5433/// AddCXXDirectInitializerToDecl - This action is called immediately after 5434/// ActOnDeclarator, when a C++ direct initializer is present. 5435/// e.g: "int x(1);" 5436void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5437 SourceLocation LParenLoc, 5438 MultiExprArg Exprs, 5439 SourceLocation RParenLoc) { 5440 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5441 5442 // If there is no declaration, there was an error parsing it. Just ignore 5443 // the initializer. 5444 if (RealDecl == 0) 5445 return; 5446 5447 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5448 if (!VDecl) { 5449 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5450 RealDecl->setInvalidDecl(); 5451 return; 5452 } 5453 5454 // We will represent direct-initialization similarly to copy-initialization: 5455 // int x(1); -as-> int x = 1; 5456 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5457 // 5458 // Clients that want to distinguish between the two forms, can check for 5459 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5460 // A major benefit is that clients that don't particularly care about which 5461 // exactly form was it (like the CodeGen) can handle both cases without 5462 // special case code. 5463 5464 // C++ 8.5p11: 5465 // The form of initialization (using parentheses or '=') is generally 5466 // insignificant, but does matter when the entity being initialized has a 5467 // class type. 5468 5469 if (!VDecl->getType()->isDependentType() && 5470 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5471 diag::err_typecheck_decl_incomplete_type)) { 5472 VDecl->setInvalidDecl(); 5473 return; 5474 } 5475 5476 // The variable can not have an abstract class type. 5477 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5478 diag::err_abstract_type_in_decl, 5479 AbstractVariableType)) 5480 VDecl->setInvalidDecl(); 5481 5482 const VarDecl *Def; 5483 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5484 Diag(VDecl->getLocation(), diag::err_redefinition) 5485 << VDecl->getDeclName(); 5486 Diag(Def->getLocation(), diag::note_previous_definition); 5487 VDecl->setInvalidDecl(); 5488 return; 5489 } 5490 5491 // C++ [class.static.data]p4 5492 // If a static data member is of const integral or const 5493 // enumeration type, its declaration in the class definition can 5494 // specify a constant-initializer which shall be an integral 5495 // constant expression (5.19). In that case, the member can appear 5496 // in integral constant expressions. The member shall still be 5497 // defined in a namespace scope if it is used in the program and the 5498 // namespace scope definition shall not contain an initializer. 5499 // 5500 // We already performed a redefinition check above, but for static 5501 // data members we also need to check whether there was an in-class 5502 // declaration with an initializer. 5503 const VarDecl* PrevInit = 0; 5504 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5505 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5506 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5507 return; 5508 } 5509 5510 // If either the declaration has a dependent type or if any of the 5511 // expressions is type-dependent, we represent the initialization 5512 // via a ParenListExpr for later use during template instantiation. 5513 if (VDecl->getType()->isDependentType() || 5514 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5515 // Let clients know that initialization was done with a direct initializer. 5516 VDecl->setCXXDirectInitializer(true); 5517 5518 // Store the initialization expressions as a ParenListExpr. 5519 unsigned NumExprs = Exprs.size(); 5520 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5521 (Expr **)Exprs.release(), 5522 NumExprs, RParenLoc)); 5523 return; 5524 } 5525 5526 // Capture the variable that is being initialized and the style of 5527 // initialization. 5528 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5529 5530 // FIXME: Poor source location information. 5531 InitializationKind Kind 5532 = InitializationKind::CreateDirect(VDecl->getLocation(), 5533 LParenLoc, RParenLoc); 5534 5535 InitializationSequence InitSeq(*this, Entity, Kind, 5536 Exprs.get(), Exprs.size()); 5537 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5538 if (Result.isInvalid()) { 5539 VDecl->setInvalidDecl(); 5540 return; 5541 } 5542 5543 CheckImplicitConversions(Result.get(), LParenLoc); 5544 5545 Result = MaybeCreateExprWithCleanups(Result); 5546 VDecl->setInit(Result.takeAs<Expr>()); 5547 VDecl->setCXXDirectInitializer(true); 5548 5549 if (!VDecl->isInvalidDecl() && 5550 !VDecl->getDeclContext()->isDependentContext() && 5551 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5552 !VDecl->getInit()->isConstantInitializer(Context, 5553 VDecl->getType()->isReferenceType())) 5554 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5555 << VDecl->getInit()->getSourceRange(); 5556 5557 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5558 FinalizeVarWithDestructor(VDecl, Record); 5559} 5560 5561/// \brief Given a constructor and the set of arguments provided for the 5562/// constructor, convert the arguments and add any required default arguments 5563/// to form a proper call to this constructor. 5564/// 5565/// \returns true if an error occurred, false otherwise. 5566bool 5567Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5568 MultiExprArg ArgsPtr, 5569 SourceLocation Loc, 5570 ASTOwningVector<Expr*> &ConvertedArgs) { 5571 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5572 unsigned NumArgs = ArgsPtr.size(); 5573 Expr **Args = (Expr **)ArgsPtr.get(); 5574 5575 const FunctionProtoType *Proto 5576 = Constructor->getType()->getAs<FunctionProtoType>(); 5577 assert(Proto && "Constructor without a prototype?"); 5578 unsigned NumArgsInProto = Proto->getNumArgs(); 5579 5580 // If too few arguments are available, we'll fill in the rest with defaults. 5581 if (NumArgs < NumArgsInProto) 5582 ConvertedArgs.reserve(NumArgsInProto); 5583 else 5584 ConvertedArgs.reserve(NumArgs); 5585 5586 VariadicCallType CallType = 5587 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5588 llvm::SmallVector<Expr *, 8> AllArgs; 5589 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5590 Proto, 0, Args, NumArgs, AllArgs, 5591 CallType); 5592 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5593 ConvertedArgs.push_back(AllArgs[i]); 5594 return Invalid; 5595} 5596 5597static inline bool 5598CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5599 const FunctionDecl *FnDecl) { 5600 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5601 if (isa<NamespaceDecl>(DC)) { 5602 return SemaRef.Diag(FnDecl->getLocation(), 5603 diag::err_operator_new_delete_declared_in_namespace) 5604 << FnDecl->getDeclName(); 5605 } 5606 5607 if (isa<TranslationUnitDecl>(DC) && 5608 FnDecl->getStorageClass() == SC_Static) { 5609 return SemaRef.Diag(FnDecl->getLocation(), 5610 diag::err_operator_new_delete_declared_static) 5611 << FnDecl->getDeclName(); 5612 } 5613 5614 return false; 5615} 5616 5617static inline bool 5618CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5619 CanQualType ExpectedResultType, 5620 CanQualType ExpectedFirstParamType, 5621 unsigned DependentParamTypeDiag, 5622 unsigned InvalidParamTypeDiag) { 5623 QualType ResultType = 5624 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5625 5626 // Check that the result type is not dependent. 5627 if (ResultType->isDependentType()) 5628 return SemaRef.Diag(FnDecl->getLocation(), 5629 diag::err_operator_new_delete_dependent_result_type) 5630 << FnDecl->getDeclName() << ExpectedResultType; 5631 5632 // Check that the result type is what we expect. 5633 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5634 return SemaRef.Diag(FnDecl->getLocation(), 5635 diag::err_operator_new_delete_invalid_result_type) 5636 << FnDecl->getDeclName() << ExpectedResultType; 5637 5638 // A function template must have at least 2 parameters. 5639 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5640 return SemaRef.Diag(FnDecl->getLocation(), 5641 diag::err_operator_new_delete_template_too_few_parameters) 5642 << FnDecl->getDeclName(); 5643 5644 // The function decl must have at least 1 parameter. 5645 if (FnDecl->getNumParams() == 0) 5646 return SemaRef.Diag(FnDecl->getLocation(), 5647 diag::err_operator_new_delete_too_few_parameters) 5648 << FnDecl->getDeclName(); 5649 5650 // Check the the first parameter type is not dependent. 5651 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5652 if (FirstParamType->isDependentType()) 5653 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5654 << FnDecl->getDeclName() << ExpectedFirstParamType; 5655 5656 // Check that the first parameter type is what we expect. 5657 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5658 ExpectedFirstParamType) 5659 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5660 << FnDecl->getDeclName() << ExpectedFirstParamType; 5661 5662 return false; 5663} 5664 5665static bool 5666CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5667 // C++ [basic.stc.dynamic.allocation]p1: 5668 // A program is ill-formed if an allocation function is declared in a 5669 // namespace scope other than global scope or declared static in global 5670 // scope. 5671 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5672 return true; 5673 5674 CanQualType SizeTy = 5675 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5676 5677 // C++ [basic.stc.dynamic.allocation]p1: 5678 // The return type shall be void*. The first parameter shall have type 5679 // std::size_t. 5680 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5681 SizeTy, 5682 diag::err_operator_new_dependent_param_type, 5683 diag::err_operator_new_param_type)) 5684 return true; 5685 5686 // C++ [basic.stc.dynamic.allocation]p1: 5687 // The first parameter shall not have an associated default argument. 5688 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5689 return SemaRef.Diag(FnDecl->getLocation(), 5690 diag::err_operator_new_default_arg) 5691 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5692 5693 return false; 5694} 5695 5696static bool 5697CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5698 // C++ [basic.stc.dynamic.deallocation]p1: 5699 // A program is ill-formed if deallocation functions are declared in a 5700 // namespace scope other than global scope or declared static in global 5701 // scope. 5702 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5703 return true; 5704 5705 // C++ [basic.stc.dynamic.deallocation]p2: 5706 // Each deallocation function shall return void and its first parameter 5707 // shall be void*. 5708 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5709 SemaRef.Context.VoidPtrTy, 5710 diag::err_operator_delete_dependent_param_type, 5711 diag::err_operator_delete_param_type)) 5712 return true; 5713 5714 return false; 5715} 5716 5717/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5718/// of this overloaded operator is well-formed. If so, returns false; 5719/// otherwise, emits appropriate diagnostics and returns true. 5720bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5721 assert(FnDecl && FnDecl->isOverloadedOperator() && 5722 "Expected an overloaded operator declaration"); 5723 5724 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5725 5726 // C++ [over.oper]p5: 5727 // The allocation and deallocation functions, operator new, 5728 // operator new[], operator delete and operator delete[], are 5729 // described completely in 3.7.3. The attributes and restrictions 5730 // found in the rest of this subclause do not apply to them unless 5731 // explicitly stated in 3.7.3. 5732 if (Op == OO_Delete || Op == OO_Array_Delete) 5733 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5734 5735 if (Op == OO_New || Op == OO_Array_New) 5736 return CheckOperatorNewDeclaration(*this, FnDecl); 5737 5738 // C++ [over.oper]p6: 5739 // An operator function shall either be a non-static member 5740 // function or be a non-member function and have at least one 5741 // parameter whose type is a class, a reference to a class, an 5742 // enumeration, or a reference to an enumeration. 5743 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5744 if (MethodDecl->isStatic()) 5745 return Diag(FnDecl->getLocation(), 5746 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5747 } else { 5748 bool ClassOrEnumParam = false; 5749 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5750 ParamEnd = FnDecl->param_end(); 5751 Param != ParamEnd; ++Param) { 5752 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5753 if (ParamType->isDependentType() || ParamType->isRecordType() || 5754 ParamType->isEnumeralType()) { 5755 ClassOrEnumParam = true; 5756 break; 5757 } 5758 } 5759 5760 if (!ClassOrEnumParam) 5761 return Diag(FnDecl->getLocation(), 5762 diag::err_operator_overload_needs_class_or_enum) 5763 << FnDecl->getDeclName(); 5764 } 5765 5766 // C++ [over.oper]p8: 5767 // An operator function cannot have default arguments (8.3.6), 5768 // except where explicitly stated below. 5769 // 5770 // Only the function-call operator allows default arguments 5771 // (C++ [over.call]p1). 5772 if (Op != OO_Call) { 5773 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5774 Param != FnDecl->param_end(); ++Param) { 5775 if ((*Param)->hasDefaultArg()) 5776 return Diag((*Param)->getLocation(), 5777 diag::err_operator_overload_default_arg) 5778 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5779 } 5780 } 5781 5782 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5783 { false, false, false } 5784#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5785 , { Unary, Binary, MemberOnly } 5786#include "clang/Basic/OperatorKinds.def" 5787 }; 5788 5789 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5790 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5791 bool MustBeMemberOperator = OperatorUses[Op][2]; 5792 5793 // C++ [over.oper]p8: 5794 // [...] Operator functions cannot have more or fewer parameters 5795 // than the number required for the corresponding operator, as 5796 // described in the rest of this subclause. 5797 unsigned NumParams = FnDecl->getNumParams() 5798 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5799 if (Op != OO_Call && 5800 ((NumParams == 1 && !CanBeUnaryOperator) || 5801 (NumParams == 2 && !CanBeBinaryOperator) || 5802 (NumParams < 1) || (NumParams > 2))) { 5803 // We have the wrong number of parameters. 5804 unsigned ErrorKind; 5805 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5806 ErrorKind = 2; // 2 -> unary or binary. 5807 } else if (CanBeUnaryOperator) { 5808 ErrorKind = 0; // 0 -> unary 5809 } else { 5810 assert(CanBeBinaryOperator && 5811 "All non-call overloaded operators are unary or binary!"); 5812 ErrorKind = 1; // 1 -> binary 5813 } 5814 5815 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5816 << FnDecl->getDeclName() << NumParams << ErrorKind; 5817 } 5818 5819 // Overloaded operators other than operator() cannot be variadic. 5820 if (Op != OO_Call && 5821 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5822 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5823 << FnDecl->getDeclName(); 5824 } 5825 5826 // Some operators must be non-static member functions. 5827 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5828 return Diag(FnDecl->getLocation(), 5829 diag::err_operator_overload_must_be_member) 5830 << FnDecl->getDeclName(); 5831 } 5832 5833 // C++ [over.inc]p1: 5834 // The user-defined function called operator++ implements the 5835 // prefix and postfix ++ operator. If this function is a member 5836 // function with no parameters, or a non-member function with one 5837 // parameter of class or enumeration type, it defines the prefix 5838 // increment operator ++ for objects of that type. If the function 5839 // is a member function with one parameter (which shall be of type 5840 // int) or a non-member function with two parameters (the second 5841 // of which shall be of type int), it defines the postfix 5842 // increment operator ++ for objects of that type. 5843 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5844 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5845 bool ParamIsInt = false; 5846 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5847 ParamIsInt = BT->getKind() == BuiltinType::Int; 5848 5849 if (!ParamIsInt) 5850 return Diag(LastParam->getLocation(), 5851 diag::err_operator_overload_post_incdec_must_be_int) 5852 << LastParam->getType() << (Op == OO_MinusMinus); 5853 } 5854 5855 return false; 5856} 5857 5858/// CheckLiteralOperatorDeclaration - Check whether the declaration 5859/// of this literal operator function is well-formed. If so, returns 5860/// false; otherwise, emits appropriate diagnostics and returns true. 5861bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5862 DeclContext *DC = FnDecl->getDeclContext(); 5863 Decl::Kind Kind = DC->getDeclKind(); 5864 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5865 Kind != Decl::LinkageSpec) { 5866 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5867 << FnDecl->getDeclName(); 5868 return true; 5869 } 5870 5871 bool Valid = false; 5872 5873 // template <char...> type operator "" name() is the only valid template 5874 // signature, and the only valid signature with no parameters. 5875 if (FnDecl->param_size() == 0) { 5876 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5877 // Must have only one template parameter 5878 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5879 if (Params->size() == 1) { 5880 NonTypeTemplateParmDecl *PmDecl = 5881 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5882 5883 // The template parameter must be a char parameter pack. 5884 // FIXME: This test will always fail because non-type parameter packs 5885 // have not been implemented. 5886 if (PmDecl && PmDecl->isTemplateParameterPack() && 5887 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5888 Valid = true; 5889 } 5890 } 5891 } else { 5892 // Check the first parameter 5893 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5894 5895 QualType T = (*Param)->getType(); 5896 5897 // unsigned long long int, long double, and any character type are allowed 5898 // as the only parameters. 5899 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5900 Context.hasSameType(T, Context.LongDoubleTy) || 5901 Context.hasSameType(T, Context.CharTy) || 5902 Context.hasSameType(T, Context.WCharTy) || 5903 Context.hasSameType(T, Context.Char16Ty) || 5904 Context.hasSameType(T, Context.Char32Ty)) { 5905 if (++Param == FnDecl->param_end()) 5906 Valid = true; 5907 goto FinishedParams; 5908 } 5909 5910 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5911 const PointerType *PT = T->getAs<PointerType>(); 5912 if (!PT) 5913 goto FinishedParams; 5914 T = PT->getPointeeType(); 5915 if (!T.isConstQualified()) 5916 goto FinishedParams; 5917 T = T.getUnqualifiedType(); 5918 5919 // Move on to the second parameter; 5920 ++Param; 5921 5922 // If there is no second parameter, the first must be a const char * 5923 if (Param == FnDecl->param_end()) { 5924 if (Context.hasSameType(T, Context.CharTy)) 5925 Valid = true; 5926 goto FinishedParams; 5927 } 5928 5929 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5930 // are allowed as the first parameter to a two-parameter function 5931 if (!(Context.hasSameType(T, Context.CharTy) || 5932 Context.hasSameType(T, Context.WCharTy) || 5933 Context.hasSameType(T, Context.Char16Ty) || 5934 Context.hasSameType(T, Context.Char32Ty))) 5935 goto FinishedParams; 5936 5937 // The second and final parameter must be an std::size_t 5938 T = (*Param)->getType().getUnqualifiedType(); 5939 if (Context.hasSameType(T, Context.getSizeType()) && 5940 ++Param == FnDecl->param_end()) 5941 Valid = true; 5942 } 5943 5944 // FIXME: This diagnostic is absolutely terrible. 5945FinishedParams: 5946 if (!Valid) { 5947 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5948 << FnDecl->getDeclName(); 5949 return true; 5950 } 5951 5952 return false; 5953} 5954 5955/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5956/// linkage specification, including the language and (if present) 5957/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5958/// the location of the language string literal, which is provided 5959/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5960/// the '{' brace. Otherwise, this linkage specification does not 5961/// have any braces. 5962Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 5963 SourceLocation LangLoc, 5964 llvm::StringRef Lang, 5965 SourceLocation LBraceLoc) { 5966 LinkageSpecDecl::LanguageIDs Language; 5967 if (Lang == "\"C\"") 5968 Language = LinkageSpecDecl::lang_c; 5969 else if (Lang == "\"C++\"") 5970 Language = LinkageSpecDecl::lang_cxx; 5971 else { 5972 Diag(LangLoc, diag::err_bad_language); 5973 return 0; 5974 } 5975 5976 // FIXME: Add all the various semantics of linkage specifications 5977 5978 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5979 LangLoc, Language, 5980 LBraceLoc.isValid()); 5981 CurContext->addDecl(D); 5982 PushDeclContext(S, D); 5983 return D; 5984} 5985 5986/// ActOnFinishLinkageSpecification - Complete the definition of 5987/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5988/// valid, it's the position of the closing '}' brace in a linkage 5989/// specification that uses braces. 5990Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 5991 Decl *LinkageSpec, 5992 SourceLocation RBraceLoc) { 5993 if (LinkageSpec) 5994 PopDeclContext(); 5995 return LinkageSpec; 5996} 5997 5998/// \brief Perform semantic analysis for the variable declaration that 5999/// occurs within a C++ catch clause, returning the newly-created 6000/// variable. 6001VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6002 TypeSourceInfo *TInfo, 6003 IdentifierInfo *Name, 6004 SourceLocation Loc) { 6005 bool Invalid = false; 6006 QualType ExDeclType = TInfo->getType(); 6007 6008 // Arrays and functions decay. 6009 if (ExDeclType->isArrayType()) 6010 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6011 else if (ExDeclType->isFunctionType()) 6012 ExDeclType = Context.getPointerType(ExDeclType); 6013 6014 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6015 // The exception-declaration shall not denote a pointer or reference to an 6016 // incomplete type, other than [cv] void*. 6017 // N2844 forbids rvalue references. 6018 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6019 Diag(Loc, diag::err_catch_rvalue_ref); 6020 Invalid = true; 6021 } 6022 6023 // GCC allows catching pointers and references to incomplete types 6024 // as an extension; so do we, but we warn by default. 6025 6026 QualType BaseType = ExDeclType; 6027 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6028 unsigned DK = diag::err_catch_incomplete; 6029 bool IncompleteCatchIsInvalid = true; 6030 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6031 BaseType = Ptr->getPointeeType(); 6032 Mode = 1; 6033 DK = diag::ext_catch_incomplete_ptr; 6034 IncompleteCatchIsInvalid = false; 6035 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6036 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6037 BaseType = Ref->getPointeeType(); 6038 Mode = 2; 6039 DK = diag::ext_catch_incomplete_ref; 6040 IncompleteCatchIsInvalid = false; 6041 } 6042 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6043 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6044 IncompleteCatchIsInvalid) 6045 Invalid = true; 6046 6047 if (!Invalid && !ExDeclType->isDependentType() && 6048 RequireNonAbstractType(Loc, ExDeclType, 6049 diag::err_abstract_type_in_decl, 6050 AbstractVariableType)) 6051 Invalid = true; 6052 6053 // Only the non-fragile NeXT runtime currently supports C++ catches 6054 // of ObjC types, and no runtime supports catching ObjC types by value. 6055 if (!Invalid && getLangOptions().ObjC1) { 6056 QualType T = ExDeclType; 6057 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6058 T = RT->getPointeeType(); 6059 6060 if (T->isObjCObjectType()) { 6061 Diag(Loc, diag::err_objc_object_catch); 6062 Invalid = true; 6063 } else if (T->isObjCObjectPointerType()) { 6064 if (!getLangOptions().NeXTRuntime) { 6065 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6066 Invalid = true; 6067 } else if (!getLangOptions().ObjCNonFragileABI) { 6068 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6069 Invalid = true; 6070 } 6071 } 6072 } 6073 6074 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6075 Name, ExDeclType, TInfo, SC_None, 6076 SC_None); 6077 ExDecl->setExceptionVariable(true); 6078 6079 if (!Invalid) { 6080 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6081 // C++ [except.handle]p16: 6082 // The object declared in an exception-declaration or, if the 6083 // exception-declaration does not specify a name, a temporary (12.2) is 6084 // copy-initialized (8.5) from the exception object. [...] 6085 // The object is destroyed when the handler exits, after the destruction 6086 // of any automatic objects initialized within the handler. 6087 // 6088 // We just pretend to initialize the object with itself, then make sure 6089 // it can be destroyed later. 6090 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6091 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6092 Loc, ExDeclType, VK_LValue, 0); 6093 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6094 SourceLocation()); 6095 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6096 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6097 MultiExprArg(*this, &ExDeclRef, 1)); 6098 if (Result.isInvalid()) 6099 Invalid = true; 6100 else 6101 FinalizeVarWithDestructor(ExDecl, RecordTy); 6102 } 6103 } 6104 6105 if (Invalid) 6106 ExDecl->setInvalidDecl(); 6107 6108 return ExDecl; 6109} 6110 6111/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6112/// handler. 6113Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6114 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6115 QualType ExDeclType = TInfo->getType(); 6116 6117 bool Invalid = D.isInvalidType(); 6118 IdentifierInfo *II = D.getIdentifier(); 6119 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6120 LookupOrdinaryName, 6121 ForRedeclaration)) { 6122 // The scope should be freshly made just for us. There is just no way 6123 // it contains any previous declaration. 6124 assert(!S->isDeclScope(PrevDecl)); 6125 if (PrevDecl->isTemplateParameter()) { 6126 // Maybe we will complain about the shadowed template parameter. 6127 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6128 } 6129 } 6130 6131 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6132 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6133 << D.getCXXScopeSpec().getRange(); 6134 Invalid = true; 6135 } 6136 6137 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6138 D.getIdentifier(), 6139 D.getIdentifierLoc()); 6140 6141 if (Invalid) 6142 ExDecl->setInvalidDecl(); 6143 6144 // Add the exception declaration into this scope. 6145 if (II) 6146 PushOnScopeChains(ExDecl, S); 6147 else 6148 CurContext->addDecl(ExDecl); 6149 6150 ProcessDeclAttributes(S, ExDecl, D); 6151 return ExDecl; 6152} 6153 6154Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6155 Expr *AssertExpr, 6156 Expr *AssertMessageExpr_) { 6157 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6158 6159 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6160 llvm::APSInt Value(32); 6161 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6162 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6163 AssertExpr->getSourceRange(); 6164 return 0; 6165 } 6166 6167 if (Value == 0) { 6168 Diag(AssertLoc, diag::err_static_assert_failed) 6169 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6170 } 6171 } 6172 6173 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6174 AssertExpr, AssertMessage); 6175 6176 CurContext->addDecl(Decl); 6177 return Decl; 6178} 6179 6180/// \brief Perform semantic analysis of the given friend type declaration. 6181/// 6182/// \returns A friend declaration that. 6183FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6184 TypeSourceInfo *TSInfo) { 6185 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6186 6187 QualType T = TSInfo->getType(); 6188 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6189 6190 if (!getLangOptions().CPlusPlus0x) { 6191 // C++03 [class.friend]p2: 6192 // An elaborated-type-specifier shall be used in a friend declaration 6193 // for a class.* 6194 // 6195 // * The class-key of the elaborated-type-specifier is required. 6196 if (!ActiveTemplateInstantiations.empty()) { 6197 // Do not complain about the form of friend template types during 6198 // template instantiation; we will already have complained when the 6199 // template was declared. 6200 } else if (!T->isElaboratedTypeSpecifier()) { 6201 // If we evaluated the type to a record type, suggest putting 6202 // a tag in front. 6203 if (const RecordType *RT = T->getAs<RecordType>()) { 6204 RecordDecl *RD = RT->getDecl(); 6205 6206 std::string InsertionText = std::string(" ") + RD->getKindName(); 6207 6208 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6209 << (unsigned) RD->getTagKind() 6210 << T 6211 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6212 InsertionText); 6213 } else { 6214 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6215 << T 6216 << SourceRange(FriendLoc, TypeRange.getEnd()); 6217 } 6218 } else if (T->getAs<EnumType>()) { 6219 Diag(FriendLoc, diag::ext_enum_friend) 6220 << T 6221 << SourceRange(FriendLoc, TypeRange.getEnd()); 6222 } 6223 } 6224 6225 // C++0x [class.friend]p3: 6226 // If the type specifier in a friend declaration designates a (possibly 6227 // cv-qualified) class type, that class is declared as a friend; otherwise, 6228 // the friend declaration is ignored. 6229 6230 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6231 // in [class.friend]p3 that we do not implement. 6232 6233 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6234} 6235 6236/// Handle a friend tag declaration where the scope specifier was 6237/// templated. 6238Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6239 unsigned TagSpec, SourceLocation TagLoc, 6240 CXXScopeSpec &SS, 6241 IdentifierInfo *Name, SourceLocation NameLoc, 6242 AttributeList *Attr, 6243 MultiTemplateParamsArg TempParamLists) { 6244 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6245 6246 bool isExplicitSpecialization = false; 6247 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6248 bool Invalid = false; 6249 6250 if (TemplateParameterList *TemplateParams 6251 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6252 TempParamLists.get(), 6253 TempParamLists.size(), 6254 /*friend*/ true, 6255 isExplicitSpecialization, 6256 Invalid)) { 6257 --NumMatchedTemplateParamLists; 6258 6259 if (TemplateParams->size() > 0) { 6260 // This is a declaration of a class template. 6261 if (Invalid) 6262 return 0; 6263 6264 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6265 SS, Name, NameLoc, Attr, 6266 TemplateParams, AS_public).take(); 6267 } else { 6268 // The "template<>" header is extraneous. 6269 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6270 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6271 isExplicitSpecialization = true; 6272 } 6273 } 6274 6275 if (Invalid) return 0; 6276 6277 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6278 6279 bool isAllExplicitSpecializations = true; 6280 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6281 if (TempParamLists.get()[I]->size()) { 6282 isAllExplicitSpecializations = false; 6283 break; 6284 } 6285 } 6286 6287 // FIXME: don't ignore attributes. 6288 6289 // If it's explicit specializations all the way down, just forget 6290 // about the template header and build an appropriate non-templated 6291 // friend. TODO: for source fidelity, remember the headers. 6292 if (isAllExplicitSpecializations) { 6293 ElaboratedTypeKeyword Keyword 6294 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6295 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6296 TagLoc, SS.getRange(), NameLoc); 6297 if (T.isNull()) 6298 return 0; 6299 6300 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6301 if (isa<DependentNameType>(T)) { 6302 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6303 TL.setKeywordLoc(TagLoc); 6304 TL.setQualifierRange(SS.getRange()); 6305 TL.setNameLoc(NameLoc); 6306 } else { 6307 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6308 TL.setKeywordLoc(TagLoc); 6309 TL.setQualifierRange(SS.getRange()); 6310 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6311 } 6312 6313 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6314 TSI, FriendLoc); 6315 Friend->setAccess(AS_public); 6316 CurContext->addDecl(Friend); 6317 return Friend; 6318 } 6319 6320 // Handle the case of a templated-scope friend class. e.g. 6321 // template <class T> class A<T>::B; 6322 // FIXME: we don't support these right now. 6323 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6324 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6325 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6326 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6327 TL.setKeywordLoc(TagLoc); 6328 TL.setQualifierRange(SS.getRange()); 6329 TL.setNameLoc(NameLoc); 6330 6331 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6332 TSI, FriendLoc); 6333 Friend->setAccess(AS_public); 6334 Friend->setUnsupportedFriend(true); 6335 CurContext->addDecl(Friend); 6336 return Friend; 6337} 6338 6339 6340/// Handle a friend type declaration. This works in tandem with 6341/// ActOnTag. 6342/// 6343/// Notes on friend class templates: 6344/// 6345/// We generally treat friend class declarations as if they were 6346/// declaring a class. So, for example, the elaborated type specifier 6347/// in a friend declaration is required to obey the restrictions of a 6348/// class-head (i.e. no typedefs in the scope chain), template 6349/// parameters are required to match up with simple template-ids, &c. 6350/// However, unlike when declaring a template specialization, it's 6351/// okay to refer to a template specialization without an empty 6352/// template parameter declaration, e.g. 6353/// friend class A<T>::B<unsigned>; 6354/// We permit this as a special case; if there are any template 6355/// parameters present at all, require proper matching, i.e. 6356/// template <> template <class T> friend class A<int>::B; 6357Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6358 MultiTemplateParamsArg TempParams) { 6359 SourceLocation Loc = DS.getSourceRange().getBegin(); 6360 6361 assert(DS.isFriendSpecified()); 6362 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6363 6364 // Try to convert the decl specifier to a type. This works for 6365 // friend templates because ActOnTag never produces a ClassTemplateDecl 6366 // for a TUK_Friend. 6367 Declarator TheDeclarator(DS, Declarator::MemberContext); 6368 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6369 QualType T = TSI->getType(); 6370 if (TheDeclarator.isInvalidType()) 6371 return 0; 6372 6373 // This is definitely an error in C++98. It's probably meant to 6374 // be forbidden in C++0x, too, but the specification is just 6375 // poorly written. 6376 // 6377 // The problem is with declarations like the following: 6378 // template <T> friend A<T>::foo; 6379 // where deciding whether a class C is a friend or not now hinges 6380 // on whether there exists an instantiation of A that causes 6381 // 'foo' to equal C. There are restrictions on class-heads 6382 // (which we declare (by fiat) elaborated friend declarations to 6383 // be) that makes this tractable. 6384 // 6385 // FIXME: handle "template <> friend class A<T>;", which 6386 // is possibly well-formed? Who even knows? 6387 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6388 Diag(Loc, diag::err_tagless_friend_type_template) 6389 << DS.getSourceRange(); 6390 return 0; 6391 } 6392 6393 // C++98 [class.friend]p1: A friend of a class is a function 6394 // or class that is not a member of the class . . . 6395 // This is fixed in DR77, which just barely didn't make the C++03 6396 // deadline. It's also a very silly restriction that seriously 6397 // affects inner classes and which nobody else seems to implement; 6398 // thus we never diagnose it, not even in -pedantic. 6399 // 6400 // But note that we could warn about it: it's always useless to 6401 // friend one of your own members (it's not, however, worthless to 6402 // friend a member of an arbitrary specialization of your template). 6403 6404 Decl *D; 6405 if (unsigned NumTempParamLists = TempParams.size()) 6406 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6407 NumTempParamLists, 6408 TempParams.release(), 6409 TSI, 6410 DS.getFriendSpecLoc()); 6411 else 6412 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6413 6414 if (!D) 6415 return 0; 6416 6417 D->setAccess(AS_public); 6418 CurContext->addDecl(D); 6419 6420 return D; 6421} 6422 6423Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6424 MultiTemplateParamsArg TemplateParams) { 6425 const DeclSpec &DS = D.getDeclSpec(); 6426 6427 assert(DS.isFriendSpecified()); 6428 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6429 6430 SourceLocation Loc = D.getIdentifierLoc(); 6431 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6432 QualType T = TInfo->getType(); 6433 6434 // C++ [class.friend]p1 6435 // A friend of a class is a function or class.... 6436 // Note that this sees through typedefs, which is intended. 6437 // It *doesn't* see through dependent types, which is correct 6438 // according to [temp.arg.type]p3: 6439 // If a declaration acquires a function type through a 6440 // type dependent on a template-parameter and this causes 6441 // a declaration that does not use the syntactic form of a 6442 // function declarator to have a function type, the program 6443 // is ill-formed. 6444 if (!T->isFunctionType()) { 6445 Diag(Loc, diag::err_unexpected_friend); 6446 6447 // It might be worthwhile to try to recover by creating an 6448 // appropriate declaration. 6449 return 0; 6450 } 6451 6452 // C++ [namespace.memdef]p3 6453 // - If a friend declaration in a non-local class first declares a 6454 // class or function, the friend class or function is a member 6455 // of the innermost enclosing namespace. 6456 // - The name of the friend is not found by simple name lookup 6457 // until a matching declaration is provided in that namespace 6458 // scope (either before or after the class declaration granting 6459 // friendship). 6460 // - If a friend function is called, its name may be found by the 6461 // name lookup that considers functions from namespaces and 6462 // classes associated with the types of the function arguments. 6463 // - When looking for a prior declaration of a class or a function 6464 // declared as a friend, scopes outside the innermost enclosing 6465 // namespace scope are not considered. 6466 6467 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6468 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6469 DeclarationName Name = NameInfo.getName(); 6470 assert(Name); 6471 6472 // The context we found the declaration in, or in which we should 6473 // create the declaration. 6474 DeclContext *DC; 6475 Scope *DCScope = S; 6476 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6477 ForRedeclaration); 6478 6479 // FIXME: there are different rules in local classes 6480 6481 // There are four cases here. 6482 // - There's no scope specifier, in which case we just go to the 6483 // appropriate scope and look for a function or function template 6484 // there as appropriate. 6485 // Recover from invalid scope qualifiers as if they just weren't there. 6486 if (SS.isInvalid() || !SS.isSet()) { 6487 // C++0x [namespace.memdef]p3: 6488 // If the name in a friend declaration is neither qualified nor 6489 // a template-id and the declaration is a function or an 6490 // elaborated-type-specifier, the lookup to determine whether 6491 // the entity has been previously declared shall not consider 6492 // any scopes outside the innermost enclosing namespace. 6493 // C++0x [class.friend]p11: 6494 // If a friend declaration appears in a local class and the name 6495 // specified is an unqualified name, a prior declaration is 6496 // looked up without considering scopes that are outside the 6497 // innermost enclosing non-class scope. For a friend function 6498 // declaration, if there is no prior declaration, the program is 6499 // ill-formed. 6500 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6501 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 6502 6503 // Find the appropriate context according to the above. 6504 DC = CurContext; 6505 while (true) { 6506 // Skip class contexts. If someone can cite chapter and verse 6507 // for this behavior, that would be nice --- it's what GCC and 6508 // EDG do, and it seems like a reasonable intent, but the spec 6509 // really only says that checks for unqualified existing 6510 // declarations should stop at the nearest enclosing namespace, 6511 // not that they should only consider the nearest enclosing 6512 // namespace. 6513 while (DC->isRecord()) 6514 DC = DC->getParent(); 6515 6516 LookupQualifiedName(Previous, DC); 6517 6518 // TODO: decide what we think about using declarations. 6519 if (isLocal || !Previous.empty()) 6520 break; 6521 6522 if (isTemplateId) { 6523 if (isa<TranslationUnitDecl>(DC)) break; 6524 } else { 6525 if (DC->isFileContext()) break; 6526 } 6527 DC = DC->getParent(); 6528 } 6529 6530 // C++ [class.friend]p1: A friend of a class is a function or 6531 // class that is not a member of the class . . . 6532 // C++0x changes this for both friend types and functions. 6533 // Most C++ 98 compilers do seem to give an error here, so 6534 // we do, too. 6535 if (!Previous.empty() && DC->Equals(CurContext) 6536 && !getLangOptions().CPlusPlus0x) 6537 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6538 6539 DCScope = getScopeForDeclContext(S, DC); 6540 6541 // - There's a non-dependent scope specifier, in which case we 6542 // compute it and do a previous lookup there for a function 6543 // or function template. 6544 } else if (!SS.getScopeRep()->isDependent()) { 6545 DC = computeDeclContext(SS); 6546 if (!DC) return 0; 6547 6548 if (RequireCompleteDeclContext(SS, DC)) return 0; 6549 6550 LookupQualifiedName(Previous, DC); 6551 6552 // Ignore things found implicitly in the wrong scope. 6553 // TODO: better diagnostics for this case. Suggesting the right 6554 // qualified scope would be nice... 6555 LookupResult::Filter F = Previous.makeFilter(); 6556 while (F.hasNext()) { 6557 NamedDecl *D = F.next(); 6558 if (!DC->InEnclosingNamespaceSetOf( 6559 D->getDeclContext()->getRedeclContext())) 6560 F.erase(); 6561 } 6562 F.done(); 6563 6564 if (Previous.empty()) { 6565 D.setInvalidType(); 6566 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6567 return 0; 6568 } 6569 6570 // C++ [class.friend]p1: A friend of a class is a function or 6571 // class that is not a member of the class . . . 6572 if (DC->Equals(CurContext)) 6573 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6574 6575 // - There's a scope specifier that does not match any template 6576 // parameter lists, in which case we use some arbitrary context, 6577 // create a method or method template, and wait for instantiation. 6578 // - There's a scope specifier that does match some template 6579 // parameter lists, which we don't handle right now. 6580 } else { 6581 DC = CurContext; 6582 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6583 } 6584 6585 if (!DC->isRecord()) { 6586 // This implies that it has to be an operator or function. 6587 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6588 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6589 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6590 Diag(Loc, diag::err_introducing_special_friend) << 6591 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6592 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6593 return 0; 6594 } 6595 } 6596 6597 bool Redeclaration = false; 6598 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6599 move(TemplateParams), 6600 IsDefinition, 6601 Redeclaration); 6602 if (!ND) return 0; 6603 6604 assert(ND->getDeclContext() == DC); 6605 assert(ND->getLexicalDeclContext() == CurContext); 6606 6607 // Add the function declaration to the appropriate lookup tables, 6608 // adjusting the redeclarations list as necessary. We don't 6609 // want to do this yet if the friending class is dependent. 6610 // 6611 // Also update the scope-based lookup if the target context's 6612 // lookup context is in lexical scope. 6613 if (!CurContext->isDependentContext()) { 6614 DC = DC->getRedeclContext(); 6615 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6616 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6617 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6618 } 6619 6620 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6621 D.getIdentifierLoc(), ND, 6622 DS.getFriendSpecLoc()); 6623 FrD->setAccess(AS_public); 6624 CurContext->addDecl(FrD); 6625 6626 if (ND->isInvalidDecl()) 6627 FrD->setInvalidDecl(); 6628 else { 6629 FunctionDecl *FD; 6630 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 6631 FD = FTD->getTemplatedDecl(); 6632 else 6633 FD = cast<FunctionDecl>(ND); 6634 6635 // Mark templated-scope function declarations as unsupported. 6636 if (FD->getNumTemplateParameterLists()) 6637 FrD->setUnsupportedFriend(true); 6638 } 6639 6640 return ND; 6641} 6642 6643void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6644 AdjustDeclIfTemplate(Dcl); 6645 6646 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6647 if (!Fn) { 6648 Diag(DelLoc, diag::err_deleted_non_function); 6649 return; 6650 } 6651 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6652 Diag(DelLoc, diag::err_deleted_decl_not_first); 6653 Diag(Prev->getLocation(), diag::note_previous_declaration); 6654 // If the declaration wasn't the first, we delete the function anyway for 6655 // recovery. 6656 } 6657 Fn->setDeleted(); 6658} 6659 6660static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6661 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6662 ++CI) { 6663 Stmt *SubStmt = *CI; 6664 if (!SubStmt) 6665 continue; 6666 if (isa<ReturnStmt>(SubStmt)) 6667 Self.Diag(SubStmt->getSourceRange().getBegin(), 6668 diag::err_return_in_constructor_handler); 6669 if (!isa<Expr>(SubStmt)) 6670 SearchForReturnInStmt(Self, SubStmt); 6671 } 6672} 6673 6674void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6675 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6676 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6677 SearchForReturnInStmt(*this, Handler); 6678 } 6679} 6680 6681bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6682 const CXXMethodDecl *Old) { 6683 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6684 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6685 6686 if (Context.hasSameType(NewTy, OldTy) || 6687 NewTy->isDependentType() || OldTy->isDependentType()) 6688 return false; 6689 6690 // Check if the return types are covariant 6691 QualType NewClassTy, OldClassTy; 6692 6693 /// Both types must be pointers or references to classes. 6694 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6695 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6696 NewClassTy = NewPT->getPointeeType(); 6697 OldClassTy = OldPT->getPointeeType(); 6698 } 6699 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6700 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6701 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6702 NewClassTy = NewRT->getPointeeType(); 6703 OldClassTy = OldRT->getPointeeType(); 6704 } 6705 } 6706 } 6707 6708 // The return types aren't either both pointers or references to a class type. 6709 if (NewClassTy.isNull()) { 6710 Diag(New->getLocation(), 6711 diag::err_different_return_type_for_overriding_virtual_function) 6712 << New->getDeclName() << NewTy << OldTy; 6713 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6714 6715 return true; 6716 } 6717 6718 // C++ [class.virtual]p6: 6719 // If the return type of D::f differs from the return type of B::f, the 6720 // class type in the return type of D::f shall be complete at the point of 6721 // declaration of D::f or shall be the class type D. 6722 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6723 if (!RT->isBeingDefined() && 6724 RequireCompleteType(New->getLocation(), NewClassTy, 6725 PDiag(diag::err_covariant_return_incomplete) 6726 << New->getDeclName())) 6727 return true; 6728 } 6729 6730 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6731 // Check if the new class derives from the old class. 6732 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6733 Diag(New->getLocation(), 6734 diag::err_covariant_return_not_derived) 6735 << New->getDeclName() << NewTy << OldTy; 6736 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6737 return true; 6738 } 6739 6740 // Check if we the conversion from derived to base is valid. 6741 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6742 diag::err_covariant_return_inaccessible_base, 6743 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6744 // FIXME: Should this point to the return type? 6745 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6746 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6747 return true; 6748 } 6749 } 6750 6751 // The qualifiers of the return types must be the same. 6752 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6753 Diag(New->getLocation(), 6754 diag::err_covariant_return_type_different_qualifications) 6755 << New->getDeclName() << NewTy << OldTy; 6756 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6757 return true; 6758 }; 6759 6760 6761 // The new class type must have the same or less qualifiers as the old type. 6762 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6763 Diag(New->getLocation(), 6764 diag::err_covariant_return_type_class_type_more_qualified) 6765 << New->getDeclName() << NewTy << OldTy; 6766 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6767 return true; 6768 }; 6769 6770 return false; 6771} 6772 6773bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6774 const CXXMethodDecl *Old) 6775{ 6776 if (Old->hasAttr<FinalAttr>()) { 6777 Diag(New->getLocation(), diag::err_final_function_overridden) 6778 << New->getDeclName(); 6779 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6780 return true; 6781 } 6782 6783 return false; 6784} 6785 6786/// \brief Mark the given method pure. 6787/// 6788/// \param Method the method to be marked pure. 6789/// 6790/// \param InitRange the source range that covers the "0" initializer. 6791bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6792 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6793 Method->setPure(); 6794 return false; 6795 } 6796 6797 if (!Method->isInvalidDecl()) 6798 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6799 << Method->getDeclName() << InitRange; 6800 return true; 6801} 6802 6803/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6804/// an initializer for the out-of-line declaration 'Dcl'. The scope 6805/// is a fresh scope pushed for just this purpose. 6806/// 6807/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6808/// static data member of class X, names should be looked up in the scope of 6809/// class X. 6810void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6811 // If there is no declaration, there was an error parsing it. 6812 if (D == 0) return; 6813 6814 // We should only get called for declarations with scope specifiers, like: 6815 // int foo::bar; 6816 assert(D->isOutOfLine()); 6817 EnterDeclaratorContext(S, D->getDeclContext()); 6818} 6819 6820/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6821/// initializer for the out-of-line declaration 'D'. 6822void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6823 // If there is no declaration, there was an error parsing it. 6824 if (D == 0) return; 6825 6826 assert(D->isOutOfLine()); 6827 ExitDeclaratorContext(S); 6828} 6829 6830/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6831/// C++ if/switch/while/for statement. 6832/// e.g: "if (int x = f()) {...}" 6833DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6834 // C++ 6.4p2: 6835 // The declarator shall not specify a function or an array. 6836 // The type-specifier-seq shall not contain typedef and shall not declare a 6837 // new class or enumeration. 6838 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6839 "Parser allowed 'typedef' as storage class of condition decl."); 6840 6841 TagDecl *OwnedTag = 0; 6842 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6843 QualType Ty = TInfo->getType(); 6844 6845 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6846 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6847 // would be created and CXXConditionDeclExpr wants a VarDecl. 6848 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6849 << D.getSourceRange(); 6850 return DeclResult(); 6851 } else if (OwnedTag && OwnedTag->isDefinition()) { 6852 // The type-specifier-seq shall not declare a new class or enumeration. 6853 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6854 } 6855 6856 Decl *Dcl = ActOnDeclarator(S, D); 6857 if (!Dcl) 6858 return DeclResult(); 6859 6860 return Dcl; 6861} 6862 6863void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6864 bool DefinitionRequired) { 6865 // Ignore any vtable uses in unevaluated operands or for classes that do 6866 // not have a vtable. 6867 if (!Class->isDynamicClass() || Class->isDependentContext() || 6868 CurContext->isDependentContext() || 6869 ExprEvalContexts.back().Context == Unevaluated) 6870 return; 6871 6872 // Try to insert this class into the map. 6873 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6874 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6875 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6876 if (!Pos.second) { 6877 // If we already had an entry, check to see if we are promoting this vtable 6878 // to required a definition. If so, we need to reappend to the VTableUses 6879 // list, since we may have already processed the first entry. 6880 if (DefinitionRequired && !Pos.first->second) { 6881 Pos.first->second = true; 6882 } else { 6883 // Otherwise, we can early exit. 6884 return; 6885 } 6886 } 6887 6888 // Local classes need to have their virtual members marked 6889 // immediately. For all other classes, we mark their virtual members 6890 // at the end of the translation unit. 6891 if (Class->isLocalClass()) 6892 MarkVirtualMembersReferenced(Loc, Class); 6893 else 6894 VTableUses.push_back(std::make_pair(Class, Loc)); 6895} 6896 6897bool Sema::DefineUsedVTables() { 6898 // If any dynamic classes have their key function defined within 6899 // this translation unit, then those vtables are considered "used" and must 6900 // be emitted. 6901 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6902 if (const CXXMethodDecl *KeyFunction 6903 = Context.getKeyFunction(DynamicClasses[I])) { 6904 const FunctionDecl *Definition = 0; 6905 if (KeyFunction->hasBody(Definition)) 6906 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6907 } 6908 } 6909 6910 if (VTableUses.empty()) 6911 return false; 6912 6913 // Note: The VTableUses vector could grow as a result of marking 6914 // the members of a class as "used", so we check the size each 6915 // time through the loop and prefer indices (with are stable) to 6916 // iterators (which are not). 6917 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6918 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6919 if (!Class) 6920 continue; 6921 6922 SourceLocation Loc = VTableUses[I].second; 6923 6924 // If this class has a key function, but that key function is 6925 // defined in another translation unit, we don't need to emit the 6926 // vtable even though we're using it. 6927 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6928 if (KeyFunction && !KeyFunction->hasBody()) { 6929 switch (KeyFunction->getTemplateSpecializationKind()) { 6930 case TSK_Undeclared: 6931 case TSK_ExplicitSpecialization: 6932 case TSK_ExplicitInstantiationDeclaration: 6933 // The key function is in another translation unit. 6934 continue; 6935 6936 case TSK_ExplicitInstantiationDefinition: 6937 case TSK_ImplicitInstantiation: 6938 // We will be instantiating the key function. 6939 break; 6940 } 6941 } else if (!KeyFunction) { 6942 // If we have a class with no key function that is the subject 6943 // of an explicit instantiation declaration, suppress the 6944 // vtable; it will live with the explicit instantiation 6945 // definition. 6946 bool IsExplicitInstantiationDeclaration 6947 = Class->getTemplateSpecializationKind() 6948 == TSK_ExplicitInstantiationDeclaration; 6949 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6950 REnd = Class->redecls_end(); 6951 R != REnd; ++R) { 6952 TemplateSpecializationKind TSK 6953 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6954 if (TSK == TSK_ExplicitInstantiationDeclaration) 6955 IsExplicitInstantiationDeclaration = true; 6956 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6957 IsExplicitInstantiationDeclaration = false; 6958 break; 6959 } 6960 } 6961 6962 if (IsExplicitInstantiationDeclaration) 6963 continue; 6964 } 6965 6966 // Mark all of the virtual members of this class as referenced, so 6967 // that we can build a vtable. Then, tell the AST consumer that a 6968 // vtable for this class is required. 6969 MarkVirtualMembersReferenced(Loc, Class); 6970 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6971 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6972 6973 // Optionally warn if we're emitting a weak vtable. 6974 if (Class->getLinkage() == ExternalLinkage && 6975 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6976 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6977 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6978 } 6979 } 6980 VTableUses.clear(); 6981 6982 return true; 6983} 6984 6985void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6986 const CXXRecordDecl *RD) { 6987 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6988 e = RD->method_end(); i != e; ++i) { 6989 CXXMethodDecl *MD = *i; 6990 6991 // C++ [basic.def.odr]p2: 6992 // [...] A virtual member function is used if it is not pure. [...] 6993 if (MD->isVirtual() && !MD->isPure()) 6994 MarkDeclarationReferenced(Loc, MD); 6995 } 6996 6997 // Only classes that have virtual bases need a VTT. 6998 if (RD->getNumVBases() == 0) 6999 return; 7000 7001 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7002 e = RD->bases_end(); i != e; ++i) { 7003 const CXXRecordDecl *Base = 7004 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7005 if (Base->getNumVBases() == 0) 7006 continue; 7007 MarkVirtualMembersReferenced(Loc, Base); 7008 } 7009} 7010 7011/// SetIvarInitializers - This routine builds initialization ASTs for the 7012/// Objective-C implementation whose ivars need be initialized. 7013void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7014 if (!getLangOptions().CPlusPlus) 7015 return; 7016 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7017 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7018 CollectIvarsToConstructOrDestruct(OID, ivars); 7019 if (ivars.empty()) 7020 return; 7021 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 7022 for (unsigned i = 0; i < ivars.size(); i++) { 7023 FieldDecl *Field = ivars[i]; 7024 if (Field->isInvalidDecl()) 7025 continue; 7026 7027 CXXBaseOrMemberInitializer *Member; 7028 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7029 InitializationKind InitKind = 7030 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7031 7032 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7033 ExprResult MemberInit = 7034 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7035 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7036 // Note, MemberInit could actually come back empty if no initialization 7037 // is required (e.g., because it would call a trivial default constructor) 7038 if (!MemberInit.get() || MemberInit.isInvalid()) 7039 continue; 7040 7041 Member = 7042 new (Context) CXXBaseOrMemberInitializer(Context, 7043 Field, SourceLocation(), 7044 SourceLocation(), 7045 MemberInit.takeAs<Expr>(), 7046 SourceLocation()); 7047 AllToInit.push_back(Member); 7048 7049 // Be sure that the destructor is accessible and is marked as referenced. 7050 if (const RecordType *RecordTy 7051 = Context.getBaseElementType(Field->getType()) 7052 ->getAs<RecordType>()) { 7053 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7054 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7055 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7056 CheckDestructorAccess(Field->getLocation(), Destructor, 7057 PDiag(diag::err_access_dtor_ivar) 7058 << Context.getBaseElementType(Field->getType())); 7059 } 7060 } 7061 } 7062 ObjCImplementation->setIvarInitializers(Context, 7063 AllToInit.data(), AllToInit.size()); 7064 } 7065} 7066