SemaDeclCXX.cpp revision 3fa5cae9b3812cab9fab6c042c3329bb70a3d046
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 = MaybeCreateCXXExprWithTemporaries(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 CXXExprWithTemporaries. 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 Expr *BitWidth = static_cast<Expr*>(BW); 847 Expr *Init = static_cast<Expr*>(InitExpr); 848 849 assert(isa<CXXRecordDecl>(CurContext)); 850 assert(!DS.isFriendSpecified()); 851 852 bool isFunc = false; 853 if (D.isFunctionDeclarator()) 854 isFunc = true; 855 else if (D.getNumTypeObjects() == 0 && 856 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 857 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 858 isFunc = TDType->isFunctionType(); 859 } 860 861 // C++ 9.2p6: A member shall not be declared to have automatic storage 862 // duration (auto, register) or with the extern storage-class-specifier. 863 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 864 // data members and cannot be applied to names declared const or static, 865 // and cannot be applied to reference members. 866 switch (DS.getStorageClassSpec()) { 867 case DeclSpec::SCS_unspecified: 868 case DeclSpec::SCS_typedef: 869 case DeclSpec::SCS_static: 870 // FALL THROUGH. 871 break; 872 case DeclSpec::SCS_mutable: 873 if (isFunc) { 874 if (DS.getStorageClassSpecLoc().isValid()) 875 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 876 else 877 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 878 879 // FIXME: It would be nicer if the keyword was ignored only for this 880 // declarator. Otherwise we could get follow-up errors. 881 D.getMutableDeclSpec().ClearStorageClassSpecs(); 882 } 883 break; 884 default: 885 if (DS.getStorageClassSpecLoc().isValid()) 886 Diag(DS.getStorageClassSpecLoc(), 887 diag::err_storageclass_invalid_for_member); 888 else 889 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 890 D.getMutableDeclSpec().ClearStorageClassSpecs(); 891 } 892 893 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 894 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 895 !isFunc); 896 897 Decl *Member; 898 if (isInstField) { 899 CXXScopeSpec &SS = D.getCXXScopeSpec(); 900 901 902 if (SS.isSet() && !SS.isInvalid()) { 903 // The user provided a superfluous scope specifier inside a class 904 // definition: 905 // 906 // class X { 907 // int X::member; 908 // }; 909 DeclContext *DC = 0; 910 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 911 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 912 << Name << FixItHint::CreateRemoval(SS.getRange()); 913 else 914 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 915 << Name << SS.getRange(); 916 917 SS.clear(); 918 } 919 920 // FIXME: Check for template parameters! 921 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 922 AS); 923 assert(Member && "HandleField never returns null"); 924 } else { 925 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 926 if (!Member) { 927 return 0; 928 } 929 930 // Non-instance-fields can't have a bitfield. 931 if (BitWidth) { 932 if (Member->isInvalidDecl()) { 933 // don't emit another diagnostic. 934 } else if (isa<VarDecl>(Member)) { 935 // C++ 9.6p3: A bit-field shall not be a static member. 936 // "static member 'A' cannot be a bit-field" 937 Diag(Loc, diag::err_static_not_bitfield) 938 << Name << BitWidth->getSourceRange(); 939 } else if (isa<TypedefDecl>(Member)) { 940 // "typedef member 'x' cannot be a bit-field" 941 Diag(Loc, diag::err_typedef_not_bitfield) 942 << Name << BitWidth->getSourceRange(); 943 } else { 944 // A function typedef ("typedef int f(); f a;"). 945 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 946 Diag(Loc, diag::err_not_integral_type_bitfield) 947 << Name << cast<ValueDecl>(Member)->getType() 948 << BitWidth->getSourceRange(); 949 } 950 951 BitWidth = 0; 952 Member->setInvalidDecl(); 953 } 954 955 Member->setAccess(AS); 956 957 // If we have declared a member function template, set the access of the 958 // templated declaration as well. 959 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 960 FunTmpl->getTemplatedDecl()->setAccess(AS); 961 } 962 963 assert((Name || isInstField) && "No identifier for non-field ?"); 964 965 if (Init) 966 AddInitializerToDecl(Member, Init, false); 967 if (Deleted) // FIXME: Source location is not very good. 968 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 969 970 if (isInstField) { 971 FieldCollector->Add(cast<FieldDecl>(Member)); 972 return 0; 973 } 974 return Member; 975} 976 977/// \brief Find the direct and/or virtual base specifiers that 978/// correspond to the given base type, for use in base initialization 979/// within a constructor. 980static bool FindBaseInitializer(Sema &SemaRef, 981 CXXRecordDecl *ClassDecl, 982 QualType BaseType, 983 const CXXBaseSpecifier *&DirectBaseSpec, 984 const CXXBaseSpecifier *&VirtualBaseSpec) { 985 // First, check for a direct base class. 986 DirectBaseSpec = 0; 987 for (CXXRecordDecl::base_class_const_iterator Base 988 = ClassDecl->bases_begin(); 989 Base != ClassDecl->bases_end(); ++Base) { 990 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 991 // We found a direct base of this type. That's what we're 992 // initializing. 993 DirectBaseSpec = &*Base; 994 break; 995 } 996 } 997 998 // Check for a virtual base class. 999 // FIXME: We might be able to short-circuit this if we know in advance that 1000 // there are no virtual bases. 1001 VirtualBaseSpec = 0; 1002 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1003 // We haven't found a base yet; search the class hierarchy for a 1004 // virtual base class. 1005 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1006 /*DetectVirtual=*/false); 1007 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1008 BaseType, Paths)) { 1009 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1010 Path != Paths.end(); ++Path) { 1011 if (Path->back().Base->isVirtual()) { 1012 VirtualBaseSpec = Path->back().Base; 1013 break; 1014 } 1015 } 1016 } 1017 } 1018 1019 return DirectBaseSpec || VirtualBaseSpec; 1020} 1021 1022/// ActOnMemInitializer - Handle a C++ member initializer. 1023MemInitResult 1024Sema::ActOnMemInitializer(Decl *ConstructorD, 1025 Scope *S, 1026 CXXScopeSpec &SS, 1027 IdentifierInfo *MemberOrBase, 1028 ParsedType TemplateTypeTy, 1029 SourceLocation IdLoc, 1030 SourceLocation LParenLoc, 1031 ExprTy **Args, unsigned NumArgs, 1032 SourceLocation RParenLoc) { 1033 if (!ConstructorD) 1034 return true; 1035 1036 AdjustDeclIfTemplate(ConstructorD); 1037 1038 CXXConstructorDecl *Constructor 1039 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1040 if (!Constructor) { 1041 // The user wrote a constructor initializer on a function that is 1042 // not a C++ constructor. Ignore the error for now, because we may 1043 // have more member initializers coming; we'll diagnose it just 1044 // once in ActOnMemInitializers. 1045 return true; 1046 } 1047 1048 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1049 1050 // C++ [class.base.init]p2: 1051 // Names in a mem-initializer-id are looked up in the scope of the 1052 // constructor’s class and, if not found in that scope, are looked 1053 // up in the scope containing the constructor’s 1054 // definition. [Note: if the constructor’s class contains a member 1055 // with the same name as a direct or virtual base class of the 1056 // class, a mem-initializer-id naming the member or base class and 1057 // composed of a single identifier refers to the class member. A 1058 // mem-initializer-id for the hidden base class may be specified 1059 // using a qualified name. ] 1060 if (!SS.getScopeRep() && !TemplateTypeTy) { 1061 // Look for a member, first. 1062 FieldDecl *Member = 0; 1063 DeclContext::lookup_result Result 1064 = ClassDecl->lookup(MemberOrBase); 1065 if (Result.first != Result.second) 1066 Member = dyn_cast<FieldDecl>(*Result.first); 1067 1068 // FIXME: Handle members of an anonymous union. 1069 1070 if (Member) 1071 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1072 LParenLoc, RParenLoc); 1073 } 1074 // It didn't name a member, so see if it names a class. 1075 QualType BaseType; 1076 TypeSourceInfo *TInfo = 0; 1077 1078 if (TemplateTypeTy) { 1079 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1080 } else { 1081 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1082 LookupParsedName(R, S, &SS); 1083 1084 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1085 if (!TyD) { 1086 if (R.isAmbiguous()) return true; 1087 1088 // We don't want access-control diagnostics here. 1089 R.suppressDiagnostics(); 1090 1091 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1092 bool NotUnknownSpecialization = false; 1093 DeclContext *DC = computeDeclContext(SS, false); 1094 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1095 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1096 1097 if (!NotUnknownSpecialization) { 1098 // When the scope specifier can refer to a member of an unknown 1099 // specialization, we take it as a type name. 1100 BaseType = CheckTypenameType(ETK_None, 1101 (NestedNameSpecifier *)SS.getScopeRep(), 1102 *MemberOrBase, SourceLocation(), 1103 SS.getRange(), IdLoc); 1104 if (BaseType.isNull()) 1105 return true; 1106 1107 R.clear(); 1108 R.setLookupName(MemberOrBase); 1109 } 1110 } 1111 1112 // If no results were found, try to correct typos. 1113 if (R.empty() && BaseType.isNull() && 1114 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1115 R.isSingleResult()) { 1116 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1117 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1118 // We have found a non-static data member with a similar 1119 // name to what was typed; complain and initialize that 1120 // member. 1121 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1122 << MemberOrBase << true << R.getLookupName() 1123 << FixItHint::CreateReplacement(R.getNameLoc(), 1124 R.getLookupName().getAsString()); 1125 Diag(Member->getLocation(), diag::note_previous_decl) 1126 << Member->getDeclName(); 1127 1128 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1129 LParenLoc, RParenLoc); 1130 } 1131 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1132 const CXXBaseSpecifier *DirectBaseSpec; 1133 const CXXBaseSpecifier *VirtualBaseSpec; 1134 if (FindBaseInitializer(*this, ClassDecl, 1135 Context.getTypeDeclType(Type), 1136 DirectBaseSpec, VirtualBaseSpec)) { 1137 // We have found a direct or virtual base class with a 1138 // similar name to what was typed; complain and initialize 1139 // that base class. 1140 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1141 << MemberOrBase << false << R.getLookupName() 1142 << FixItHint::CreateReplacement(R.getNameLoc(), 1143 R.getLookupName().getAsString()); 1144 1145 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1146 : VirtualBaseSpec; 1147 Diag(BaseSpec->getSourceRange().getBegin(), 1148 diag::note_base_class_specified_here) 1149 << BaseSpec->getType() 1150 << BaseSpec->getSourceRange(); 1151 1152 TyD = Type; 1153 } 1154 } 1155 } 1156 1157 if (!TyD && BaseType.isNull()) { 1158 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1159 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1160 return true; 1161 } 1162 } 1163 1164 if (BaseType.isNull()) { 1165 BaseType = Context.getTypeDeclType(TyD); 1166 if (SS.isSet()) { 1167 NestedNameSpecifier *Qualifier = 1168 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1169 1170 // FIXME: preserve source range information 1171 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1172 } 1173 } 1174 } 1175 1176 if (!TInfo) 1177 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1178 1179 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1180 LParenLoc, RParenLoc, ClassDecl); 1181} 1182 1183/// Checks an initializer expression for use of uninitialized fields, such as 1184/// containing the field that is being initialized. Returns true if there is an 1185/// uninitialized field was used an updates the SourceLocation parameter; false 1186/// otherwise. 1187static bool InitExprContainsUninitializedFields(const Stmt *S, 1188 const FieldDecl *LhsField, 1189 SourceLocation *L) { 1190 if (isa<CallExpr>(S)) { 1191 // Do not descend into function calls or constructors, as the use 1192 // of an uninitialized field may be valid. One would have to inspect 1193 // the contents of the function/ctor to determine if it is safe or not. 1194 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1195 // may be safe, depending on what the function/ctor does. 1196 return false; 1197 } 1198 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1199 const NamedDecl *RhsField = ME->getMemberDecl(); 1200 1201 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1202 // The member expression points to a static data member. 1203 assert(VD->isStaticDataMember() && 1204 "Member points to non-static data member!"); 1205 (void)VD; 1206 return false; 1207 } 1208 1209 if (isa<EnumConstantDecl>(RhsField)) { 1210 // The member expression points to an enum. 1211 return false; 1212 } 1213 1214 if (RhsField == LhsField) { 1215 // Initializing a field with itself. Throw a warning. 1216 // But wait; there are exceptions! 1217 // Exception #1: The field may not belong to this record. 1218 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1219 const Expr *base = ME->getBase(); 1220 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1221 // Even though the field matches, it does not belong to this record. 1222 return false; 1223 } 1224 // None of the exceptions triggered; return true to indicate an 1225 // uninitialized field was used. 1226 *L = ME->getMemberLoc(); 1227 return true; 1228 } 1229 } else if (isa<SizeOfAlignOfExpr>(S)) { 1230 // sizeof/alignof doesn't reference contents, do not warn. 1231 return false; 1232 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1233 // address-of doesn't reference contents (the pointer may be dereferenced 1234 // in the same expression but it would be rare; and weird). 1235 if (UOE->getOpcode() == UO_AddrOf) 1236 return false; 1237 } 1238 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1239 it != e; ++it) { 1240 if (!*it) { 1241 // An expression such as 'member(arg ?: "")' may trigger this. 1242 continue; 1243 } 1244 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1245 return true; 1246 } 1247 return false; 1248} 1249 1250MemInitResult 1251Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1252 unsigned NumArgs, SourceLocation IdLoc, 1253 SourceLocation LParenLoc, 1254 SourceLocation RParenLoc) { 1255 // Diagnose value-uses of fields to initialize themselves, e.g. 1256 // foo(foo) 1257 // where foo is not also a parameter to the constructor. 1258 // TODO: implement -Wuninitialized and fold this into that framework. 1259 for (unsigned i = 0; i < NumArgs; ++i) { 1260 SourceLocation L; 1261 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1262 // FIXME: Return true in the case when other fields are used before being 1263 // uninitialized. For example, let this field be the i'th field. When 1264 // initializing the i'th field, throw a warning if any of the >= i'th 1265 // fields are used, as they are not yet initialized. 1266 // Right now we are only handling the case where the i'th field uses 1267 // itself in its initializer. 1268 Diag(L, diag::warn_field_is_uninit); 1269 } 1270 } 1271 1272 bool HasDependentArg = false; 1273 for (unsigned i = 0; i < NumArgs; i++) 1274 HasDependentArg |= Args[i]->isTypeDependent(); 1275 1276 if (Member->getType()->isDependentType() || HasDependentArg) { 1277 // Can't check initialization for a member of dependent type or when 1278 // any of the arguments are type-dependent expressions. 1279 Expr *Init 1280 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1281 RParenLoc); 1282 1283 // Erase any temporaries within this evaluation context; we're not 1284 // going to track them in the AST, since we'll be rebuilding the 1285 // ASTs during template instantiation. 1286 ExprTemporaries.erase( 1287 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1288 ExprTemporaries.end()); 1289 1290 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1291 LParenLoc, 1292 Init, 1293 RParenLoc); 1294 1295 } 1296 1297 if (Member->isInvalidDecl()) 1298 return true; 1299 1300 // Initialize the member. 1301 InitializedEntity MemberEntity = 1302 InitializedEntity::InitializeMember(Member, 0); 1303 InitializationKind Kind = 1304 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1305 1306 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1307 1308 ExprResult MemberInit = 1309 InitSeq.Perform(*this, MemberEntity, Kind, 1310 MultiExprArg(*this, Args, NumArgs), 0); 1311 if (MemberInit.isInvalid()) 1312 return true; 1313 1314 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1315 1316 // C++0x [class.base.init]p7: 1317 // The initialization of each base and member constitutes a 1318 // full-expression. 1319 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1320 if (MemberInit.isInvalid()) 1321 return true; 1322 1323 // If we are in a dependent context, template instantiation will 1324 // perform this type-checking again. Just save the arguments that we 1325 // received in a ParenListExpr. 1326 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1327 // of the information that we have about the member 1328 // initializer. However, deconstructing the ASTs is a dicey process, 1329 // and this approach is far more likely to get the corner cases right. 1330 if (CurContext->isDependentContext()) { 1331 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1332 RParenLoc); 1333 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1334 LParenLoc, 1335 Init, 1336 RParenLoc); 1337 } 1338 1339 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1340 LParenLoc, 1341 MemberInit.get(), 1342 RParenLoc); 1343} 1344 1345MemInitResult 1346Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1347 Expr **Args, unsigned NumArgs, 1348 SourceLocation LParenLoc, SourceLocation RParenLoc, 1349 CXXRecordDecl *ClassDecl) { 1350 bool HasDependentArg = false; 1351 for (unsigned i = 0; i < NumArgs; i++) 1352 HasDependentArg |= Args[i]->isTypeDependent(); 1353 1354 SourceLocation BaseLoc 1355 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1356 1357 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1358 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1359 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1360 1361 // C++ [class.base.init]p2: 1362 // [...] Unless the mem-initializer-id names a nonstatic data 1363 // member of the constructor’s class or a direct or virtual base 1364 // of that class, the mem-initializer is ill-formed. A 1365 // mem-initializer-list can initialize a base class using any 1366 // name that denotes that base class type. 1367 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1368 1369 // Check for direct and virtual base classes. 1370 const CXXBaseSpecifier *DirectBaseSpec = 0; 1371 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1372 if (!Dependent) { 1373 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1374 VirtualBaseSpec); 1375 1376 // C++ [base.class.init]p2: 1377 // Unless the mem-initializer-id names a nonstatic data member of the 1378 // constructor's class or a direct or virtual base of that class, the 1379 // mem-initializer is ill-formed. 1380 if (!DirectBaseSpec && !VirtualBaseSpec) { 1381 // If the class has any dependent bases, then it's possible that 1382 // one of those types will resolve to the same type as 1383 // BaseType. Therefore, just treat this as a dependent base 1384 // class initialization. FIXME: Should we try to check the 1385 // initialization anyway? It seems odd. 1386 if (ClassDecl->hasAnyDependentBases()) 1387 Dependent = true; 1388 else 1389 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1390 << BaseType << Context.getTypeDeclType(ClassDecl) 1391 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1392 } 1393 } 1394 1395 if (Dependent) { 1396 // Can't check initialization for a base of dependent type or when 1397 // any of the arguments are type-dependent expressions. 1398 ExprResult BaseInit 1399 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1400 RParenLoc)); 1401 1402 // Erase any temporaries within this evaluation context; we're not 1403 // going to track them in the AST, since we'll be rebuilding the 1404 // ASTs during template instantiation. 1405 ExprTemporaries.erase( 1406 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1407 ExprTemporaries.end()); 1408 1409 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1410 /*IsVirtual=*/false, 1411 LParenLoc, 1412 BaseInit.takeAs<Expr>(), 1413 RParenLoc); 1414 } 1415 1416 // C++ [base.class.init]p2: 1417 // If a mem-initializer-id is ambiguous because it designates both 1418 // a direct non-virtual base class and an inherited virtual base 1419 // class, the mem-initializer is ill-formed. 1420 if (DirectBaseSpec && VirtualBaseSpec) 1421 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1422 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1423 1424 CXXBaseSpecifier *BaseSpec 1425 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1426 if (!BaseSpec) 1427 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1428 1429 // Initialize the base. 1430 InitializedEntity BaseEntity = 1431 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1432 InitializationKind Kind = 1433 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1434 1435 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1436 1437 ExprResult BaseInit = 1438 InitSeq.Perform(*this, BaseEntity, Kind, 1439 MultiExprArg(*this, Args, NumArgs), 0); 1440 if (BaseInit.isInvalid()) 1441 return true; 1442 1443 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1444 1445 // C++0x [class.base.init]p7: 1446 // The initialization of each base and member constitutes a 1447 // full-expression. 1448 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1449 if (BaseInit.isInvalid()) 1450 return true; 1451 1452 // If we are in a dependent context, template instantiation will 1453 // perform this type-checking again. Just save the arguments that we 1454 // received in a ParenListExpr. 1455 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1456 // of the information that we have about the base 1457 // initializer. However, deconstructing the ASTs is a dicey process, 1458 // and this approach is far more likely to get the corner cases right. 1459 if (CurContext->isDependentContext()) { 1460 ExprResult Init 1461 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1462 RParenLoc)); 1463 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1464 BaseSpec->isVirtual(), 1465 LParenLoc, 1466 Init.takeAs<Expr>(), 1467 RParenLoc); 1468 } 1469 1470 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1471 BaseSpec->isVirtual(), 1472 LParenLoc, 1473 BaseInit.takeAs<Expr>(), 1474 RParenLoc); 1475} 1476 1477/// ImplicitInitializerKind - How an implicit base or member initializer should 1478/// initialize its base or member. 1479enum ImplicitInitializerKind { 1480 IIK_Default, 1481 IIK_Copy, 1482 IIK_Move 1483}; 1484 1485static bool 1486BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1487 ImplicitInitializerKind ImplicitInitKind, 1488 CXXBaseSpecifier *BaseSpec, 1489 bool IsInheritedVirtualBase, 1490 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1491 InitializedEntity InitEntity 1492 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1493 IsInheritedVirtualBase); 1494 1495 ExprResult BaseInit; 1496 1497 switch (ImplicitInitKind) { 1498 case IIK_Default: { 1499 InitializationKind InitKind 1500 = InitializationKind::CreateDefault(Constructor->getLocation()); 1501 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1502 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1503 MultiExprArg(SemaRef, 0, 0)); 1504 break; 1505 } 1506 1507 case IIK_Copy: { 1508 ParmVarDecl *Param = Constructor->getParamDecl(0); 1509 QualType ParamType = Param->getType().getNonReferenceType(); 1510 1511 Expr *CopyCtorArg = 1512 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1513 Constructor->getLocation(), ParamType, 0); 1514 1515 // Cast to the base class to avoid ambiguities. 1516 QualType ArgTy = 1517 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1518 ParamType.getQualifiers()); 1519 1520 CXXCastPath BasePath; 1521 BasePath.push_back(BaseSpec); 1522 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1523 CK_UncheckedDerivedToBase, 1524 VK_LValue, &BasePath); 1525 1526 InitializationKind InitKind 1527 = InitializationKind::CreateDirect(Constructor->getLocation(), 1528 SourceLocation(), SourceLocation()); 1529 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1530 &CopyCtorArg, 1); 1531 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1532 MultiExprArg(&CopyCtorArg, 1)); 1533 break; 1534 } 1535 1536 case IIK_Move: 1537 assert(false && "Unhandled initializer kind!"); 1538 } 1539 1540 if (BaseInit.isInvalid()) 1541 return true; 1542 1543 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1544 if (BaseInit.isInvalid()) 1545 return true; 1546 1547 CXXBaseInit = 1548 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1549 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1550 SourceLocation()), 1551 BaseSpec->isVirtual(), 1552 SourceLocation(), 1553 BaseInit.takeAs<Expr>(), 1554 SourceLocation()); 1555 1556 return false; 1557} 1558 1559static bool 1560BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1561 ImplicitInitializerKind ImplicitInitKind, 1562 FieldDecl *Field, 1563 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1564 if (Field->isInvalidDecl()) 1565 return true; 1566 1567 SourceLocation Loc = Constructor->getLocation(); 1568 1569 if (ImplicitInitKind == IIK_Copy) { 1570 ParmVarDecl *Param = Constructor->getParamDecl(0); 1571 QualType ParamType = Param->getType().getNonReferenceType(); 1572 1573 Expr *MemberExprBase = 1574 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1575 Loc, ParamType, 0); 1576 1577 // Build a reference to this field within the parameter. 1578 CXXScopeSpec SS; 1579 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1580 Sema::LookupMemberName); 1581 MemberLookup.addDecl(Field, AS_public); 1582 MemberLookup.resolveKind(); 1583 ExprResult CopyCtorArg 1584 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1585 ParamType, Loc, 1586 /*IsArrow=*/false, 1587 SS, 1588 /*FirstQualifierInScope=*/0, 1589 MemberLookup, 1590 /*TemplateArgs=*/0); 1591 if (CopyCtorArg.isInvalid()) 1592 return true; 1593 1594 // When the field we are copying is an array, create index variables for 1595 // each dimension of the array. We use these index variables to subscript 1596 // the source array, and other clients (e.g., CodeGen) will perform the 1597 // necessary iteration with these index variables. 1598 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1599 QualType BaseType = Field->getType(); 1600 QualType SizeType = SemaRef.Context.getSizeType(); 1601 while (const ConstantArrayType *Array 1602 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1603 // Create the iteration variable for this array index. 1604 IdentifierInfo *IterationVarName = 0; 1605 { 1606 llvm::SmallString<8> Str; 1607 llvm::raw_svector_ostream OS(Str); 1608 OS << "__i" << IndexVariables.size(); 1609 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1610 } 1611 VarDecl *IterationVar 1612 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1613 IterationVarName, SizeType, 1614 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1615 SC_None, SC_None); 1616 IndexVariables.push_back(IterationVar); 1617 1618 // Create a reference to the iteration variable. 1619 ExprResult IterationVarRef 1620 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1621 assert(!IterationVarRef.isInvalid() && 1622 "Reference to invented variable cannot fail!"); 1623 1624 // Subscript the array with this iteration variable. 1625 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1626 Loc, 1627 IterationVarRef.take(), 1628 Loc); 1629 if (CopyCtorArg.isInvalid()) 1630 return true; 1631 1632 BaseType = Array->getElementType(); 1633 } 1634 1635 // Construct the entity that we will be initializing. For an array, this 1636 // will be first element in the array, which may require several levels 1637 // of array-subscript entities. 1638 llvm::SmallVector<InitializedEntity, 4> Entities; 1639 Entities.reserve(1 + IndexVariables.size()); 1640 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1641 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1642 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1643 0, 1644 Entities.back())); 1645 1646 // Direct-initialize to use the copy constructor. 1647 InitializationKind InitKind = 1648 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1649 1650 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1651 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1652 &CopyCtorArgE, 1); 1653 1654 ExprResult MemberInit 1655 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1656 MultiExprArg(&CopyCtorArgE, 1)); 1657 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1658 if (MemberInit.isInvalid()) 1659 return true; 1660 1661 CXXMemberInit 1662 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1663 MemberInit.takeAs<Expr>(), Loc, 1664 IndexVariables.data(), 1665 IndexVariables.size()); 1666 return false; 1667 } 1668 1669 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1670 1671 QualType FieldBaseElementType = 1672 SemaRef.Context.getBaseElementType(Field->getType()); 1673 1674 if (FieldBaseElementType->isRecordType()) { 1675 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1676 InitializationKind InitKind = 1677 InitializationKind::CreateDefault(Loc); 1678 1679 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1680 ExprResult MemberInit = 1681 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1682 if (MemberInit.isInvalid()) 1683 return true; 1684 1685 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1686 if (MemberInit.isInvalid()) 1687 return true; 1688 1689 CXXMemberInit = 1690 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1691 Field, Loc, Loc, 1692 MemberInit.get(), 1693 Loc); 1694 return false; 1695 } 1696 1697 if (FieldBaseElementType->isReferenceType()) { 1698 SemaRef.Diag(Constructor->getLocation(), 1699 diag::err_uninitialized_member_in_ctor) 1700 << (int)Constructor->isImplicit() 1701 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1702 << 0 << Field->getDeclName(); 1703 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1704 return true; 1705 } 1706 1707 if (FieldBaseElementType.isConstQualified()) { 1708 SemaRef.Diag(Constructor->getLocation(), 1709 diag::err_uninitialized_member_in_ctor) 1710 << (int)Constructor->isImplicit() 1711 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1712 << 1 << Field->getDeclName(); 1713 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1714 return true; 1715 } 1716 1717 // Nothing to initialize. 1718 CXXMemberInit = 0; 1719 return false; 1720} 1721 1722namespace { 1723struct BaseAndFieldInfo { 1724 Sema &S; 1725 CXXConstructorDecl *Ctor; 1726 bool AnyErrorsInInits; 1727 ImplicitInitializerKind IIK; 1728 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1729 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1730 1731 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1732 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1733 // FIXME: Handle implicit move constructors. 1734 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1735 IIK = IIK_Copy; 1736 else 1737 IIK = IIK_Default; 1738 } 1739}; 1740} 1741 1742static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1743 FieldDecl *Top, FieldDecl *Field, 1744 CXXBaseOrMemberInitializer *Init) { 1745 // If the member doesn't need to be initialized, Init will still be null. 1746 if (!Init) 1747 return; 1748 1749 Info.AllToInit.push_back(Init); 1750 if (Field != Top) { 1751 Init->setMember(Top); 1752 Init->setAnonUnionMember(Field); 1753 } 1754} 1755 1756static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1757 FieldDecl *Top, FieldDecl *Field) { 1758 1759 // Overwhelmingly common case: we have a direct initializer for this field. 1760 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1761 RecordFieldInitializer(Info, Top, Field, Init); 1762 return false; 1763 } 1764 1765 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1766 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1767 assert(FieldClassType && "anonymous struct/union without record type"); 1768 CXXRecordDecl *FieldClassDecl 1769 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1770 1771 // Even though union members never have non-trivial default 1772 // constructions in C++03, we still build member initializers for aggregate 1773 // record types which can be union members, and C++0x allows non-trivial 1774 // default constructors for union members, so we ensure that only one 1775 // member is initialized for these. 1776 if (FieldClassDecl->isUnion()) { 1777 // First check for an explicit initializer for one field. 1778 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1779 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1780 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1781 RecordFieldInitializer(Info, Top, *FA, Init); 1782 1783 // Once we've initialized a field of an anonymous union, the union 1784 // field in the class is also initialized, so exit immediately. 1785 return false; 1786 } else if ((*FA)->isAnonymousStructOrUnion()) { 1787 if (CollectFieldInitializer(Info, Top, *FA)) 1788 return true; 1789 } 1790 } 1791 1792 // Fallthrough and construct a default initializer for the union as 1793 // a whole, which can call its default constructor if such a thing exists 1794 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1795 // behavior going forward with C++0x, when anonymous unions there are 1796 // finalized, we should revisit this. 1797 } else { 1798 // For structs, we simply descend through to initialize all members where 1799 // necessary. 1800 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1801 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1802 if (CollectFieldInitializer(Info, Top, *FA)) 1803 return true; 1804 } 1805 } 1806 } 1807 1808 // Don't try to build an implicit initializer if there were semantic 1809 // errors in any of the initializers (and therefore we might be 1810 // missing some that the user actually wrote). 1811 if (Info.AnyErrorsInInits) 1812 return false; 1813 1814 CXXBaseOrMemberInitializer *Init = 0; 1815 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1816 return true; 1817 1818 RecordFieldInitializer(Info, Top, Field, Init); 1819 return false; 1820} 1821 1822bool 1823Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1824 CXXBaseOrMemberInitializer **Initializers, 1825 unsigned NumInitializers, 1826 bool AnyErrors) { 1827 if (Constructor->getDeclContext()->isDependentContext()) { 1828 // Just store the initializers as written, they will be checked during 1829 // instantiation. 1830 if (NumInitializers > 0) { 1831 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1832 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1833 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1834 memcpy(baseOrMemberInitializers, Initializers, 1835 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1836 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1837 } 1838 1839 return false; 1840 } 1841 1842 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1843 1844 // We need to build the initializer AST according to order of construction 1845 // and not what user specified in the Initializers list. 1846 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1847 if (!ClassDecl) 1848 return true; 1849 1850 bool HadError = false; 1851 1852 for (unsigned i = 0; i < NumInitializers; i++) { 1853 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1854 1855 if (Member->isBaseInitializer()) 1856 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1857 else 1858 Info.AllBaseFields[Member->getMember()] = Member; 1859 } 1860 1861 // Keep track of the direct virtual bases. 1862 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1863 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1864 E = ClassDecl->bases_end(); I != E; ++I) { 1865 if (I->isVirtual()) 1866 DirectVBases.insert(I); 1867 } 1868 1869 // Push virtual bases before others. 1870 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1871 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1872 1873 if (CXXBaseOrMemberInitializer *Value 1874 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1875 Info.AllToInit.push_back(Value); 1876 } else if (!AnyErrors) { 1877 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1878 CXXBaseOrMemberInitializer *CXXBaseInit; 1879 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1880 VBase, IsInheritedVirtualBase, 1881 CXXBaseInit)) { 1882 HadError = true; 1883 continue; 1884 } 1885 1886 Info.AllToInit.push_back(CXXBaseInit); 1887 } 1888 } 1889 1890 // Non-virtual bases. 1891 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1892 E = ClassDecl->bases_end(); Base != E; ++Base) { 1893 // Virtuals are in the virtual base list and already constructed. 1894 if (Base->isVirtual()) 1895 continue; 1896 1897 if (CXXBaseOrMemberInitializer *Value 1898 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1899 Info.AllToInit.push_back(Value); 1900 } else if (!AnyErrors) { 1901 CXXBaseOrMemberInitializer *CXXBaseInit; 1902 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1903 Base, /*IsInheritedVirtualBase=*/false, 1904 CXXBaseInit)) { 1905 HadError = true; 1906 continue; 1907 } 1908 1909 Info.AllToInit.push_back(CXXBaseInit); 1910 } 1911 } 1912 1913 // Fields. 1914 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1915 E = ClassDecl->field_end(); Field != E; ++Field) { 1916 if ((*Field)->getType()->isIncompleteArrayType()) { 1917 assert(ClassDecl->hasFlexibleArrayMember() && 1918 "Incomplete array type is not valid"); 1919 continue; 1920 } 1921 if (CollectFieldInitializer(Info, *Field, *Field)) 1922 HadError = true; 1923 } 1924 1925 NumInitializers = Info.AllToInit.size(); 1926 if (NumInitializers > 0) { 1927 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1928 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1929 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1930 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1931 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1932 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1933 1934 // Constructors implicitly reference the base and member 1935 // destructors. 1936 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1937 Constructor->getParent()); 1938 } 1939 1940 return HadError; 1941} 1942 1943static void *GetKeyForTopLevelField(FieldDecl *Field) { 1944 // For anonymous unions, use the class declaration as the key. 1945 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1946 if (RT->getDecl()->isAnonymousStructOrUnion()) 1947 return static_cast<void *>(RT->getDecl()); 1948 } 1949 return static_cast<void *>(Field); 1950} 1951 1952static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1953 return Context.getCanonicalType(BaseType).getTypePtr(); 1954} 1955 1956static void *GetKeyForMember(ASTContext &Context, 1957 CXXBaseOrMemberInitializer *Member, 1958 bool MemberMaybeAnon = false) { 1959 if (!Member->isMemberInitializer()) 1960 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1961 1962 // For fields injected into the class via declaration of an anonymous union, 1963 // use its anonymous union class declaration as the unique key. 1964 FieldDecl *Field = Member->getMember(); 1965 1966 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1967 // data member of the class. Data member used in the initializer list is 1968 // in AnonUnionMember field. 1969 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1970 Field = Member->getAnonUnionMember(); 1971 1972 // If the field is a member of an anonymous struct or union, our key 1973 // is the anonymous record decl that's a direct child of the class. 1974 RecordDecl *RD = Field->getParent(); 1975 if (RD->isAnonymousStructOrUnion()) { 1976 while (true) { 1977 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1978 if (Parent->isAnonymousStructOrUnion()) 1979 RD = Parent; 1980 else 1981 break; 1982 } 1983 1984 return static_cast<void *>(RD); 1985 } 1986 1987 return static_cast<void *>(Field); 1988} 1989 1990static void 1991DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1992 const CXXConstructorDecl *Constructor, 1993 CXXBaseOrMemberInitializer **Inits, 1994 unsigned NumInits) { 1995 if (Constructor->getDeclContext()->isDependentContext()) 1996 return; 1997 1998 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1999 == Diagnostic::Ignored) 2000 return; 2001 2002 // Build the list of bases and members in the order that they'll 2003 // actually be initialized. The explicit initializers should be in 2004 // this same order but may be missing things. 2005 llvm::SmallVector<const void*, 32> IdealInitKeys; 2006 2007 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2008 2009 // 1. Virtual bases. 2010 for (CXXRecordDecl::base_class_const_iterator VBase = 2011 ClassDecl->vbases_begin(), 2012 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2013 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2014 2015 // 2. Non-virtual bases. 2016 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2017 E = ClassDecl->bases_end(); Base != E; ++Base) { 2018 if (Base->isVirtual()) 2019 continue; 2020 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2021 } 2022 2023 // 3. Direct fields. 2024 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2025 E = ClassDecl->field_end(); Field != E; ++Field) 2026 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2027 2028 unsigned NumIdealInits = IdealInitKeys.size(); 2029 unsigned IdealIndex = 0; 2030 2031 CXXBaseOrMemberInitializer *PrevInit = 0; 2032 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2033 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2034 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2035 2036 // Scan forward to try to find this initializer in the idealized 2037 // initializers list. 2038 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2039 if (InitKey == IdealInitKeys[IdealIndex]) 2040 break; 2041 2042 // If we didn't find this initializer, it must be because we 2043 // scanned past it on a previous iteration. That can only 2044 // happen if we're out of order; emit a warning. 2045 if (IdealIndex == NumIdealInits && PrevInit) { 2046 Sema::SemaDiagnosticBuilder D = 2047 SemaRef.Diag(PrevInit->getSourceLocation(), 2048 diag::warn_initializer_out_of_order); 2049 2050 if (PrevInit->isMemberInitializer()) 2051 D << 0 << PrevInit->getMember()->getDeclName(); 2052 else 2053 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2054 2055 if (Init->isMemberInitializer()) 2056 D << 0 << Init->getMember()->getDeclName(); 2057 else 2058 D << 1 << Init->getBaseClassInfo()->getType(); 2059 2060 // Move back to the initializer's location in the ideal list. 2061 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2062 if (InitKey == IdealInitKeys[IdealIndex]) 2063 break; 2064 2065 assert(IdealIndex != NumIdealInits && 2066 "initializer not found in initializer list"); 2067 } 2068 2069 PrevInit = Init; 2070 } 2071} 2072 2073namespace { 2074bool CheckRedundantInit(Sema &S, 2075 CXXBaseOrMemberInitializer *Init, 2076 CXXBaseOrMemberInitializer *&PrevInit) { 2077 if (!PrevInit) { 2078 PrevInit = Init; 2079 return false; 2080 } 2081 2082 if (FieldDecl *Field = Init->getMember()) 2083 S.Diag(Init->getSourceLocation(), 2084 diag::err_multiple_mem_initialization) 2085 << Field->getDeclName() 2086 << Init->getSourceRange(); 2087 else { 2088 Type *BaseClass = Init->getBaseClass(); 2089 assert(BaseClass && "neither field nor base"); 2090 S.Diag(Init->getSourceLocation(), 2091 diag::err_multiple_base_initialization) 2092 << QualType(BaseClass, 0) 2093 << Init->getSourceRange(); 2094 } 2095 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2096 << 0 << PrevInit->getSourceRange(); 2097 2098 return true; 2099} 2100 2101typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2102typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2103 2104bool CheckRedundantUnionInit(Sema &S, 2105 CXXBaseOrMemberInitializer *Init, 2106 RedundantUnionMap &Unions) { 2107 FieldDecl *Field = Init->getMember(); 2108 RecordDecl *Parent = Field->getParent(); 2109 if (!Parent->isAnonymousStructOrUnion()) 2110 return false; 2111 2112 NamedDecl *Child = Field; 2113 do { 2114 if (Parent->isUnion()) { 2115 UnionEntry &En = Unions[Parent]; 2116 if (En.first && En.first != Child) { 2117 S.Diag(Init->getSourceLocation(), 2118 diag::err_multiple_mem_union_initialization) 2119 << Field->getDeclName() 2120 << Init->getSourceRange(); 2121 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2122 << 0 << En.second->getSourceRange(); 2123 return true; 2124 } else if (!En.first) { 2125 En.first = Child; 2126 En.second = Init; 2127 } 2128 } 2129 2130 Child = Parent; 2131 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2132 } while (Parent->isAnonymousStructOrUnion()); 2133 2134 return false; 2135} 2136} 2137 2138/// ActOnMemInitializers - Handle the member initializers for a constructor. 2139void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2140 SourceLocation ColonLoc, 2141 MemInitTy **meminits, unsigned NumMemInits, 2142 bool AnyErrors) { 2143 if (!ConstructorDecl) 2144 return; 2145 2146 AdjustDeclIfTemplate(ConstructorDecl); 2147 2148 CXXConstructorDecl *Constructor 2149 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2150 2151 if (!Constructor) { 2152 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2153 return; 2154 } 2155 2156 CXXBaseOrMemberInitializer **MemInits = 2157 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2158 2159 // Mapping for the duplicate initializers check. 2160 // For member initializers, this is keyed with a FieldDecl*. 2161 // For base initializers, this is keyed with a Type*. 2162 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2163 2164 // Mapping for the inconsistent anonymous-union initializers check. 2165 RedundantUnionMap MemberUnions; 2166 2167 bool HadError = false; 2168 for (unsigned i = 0; i < NumMemInits; i++) { 2169 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2170 2171 // Set the source order index. 2172 Init->setSourceOrder(i); 2173 2174 if (Init->isMemberInitializer()) { 2175 FieldDecl *Field = Init->getMember(); 2176 if (CheckRedundantInit(*this, Init, Members[Field]) || 2177 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2178 HadError = true; 2179 } else { 2180 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2181 if (CheckRedundantInit(*this, Init, Members[Key])) 2182 HadError = true; 2183 } 2184 } 2185 2186 if (HadError) 2187 return; 2188 2189 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2190 2191 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2192} 2193 2194void 2195Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2196 CXXRecordDecl *ClassDecl) { 2197 // Ignore dependent contexts. 2198 if (ClassDecl->isDependentContext()) 2199 return; 2200 2201 // FIXME: all the access-control diagnostics are positioned on the 2202 // field/base declaration. That's probably good; that said, the 2203 // user might reasonably want to know why the destructor is being 2204 // emitted, and we currently don't say. 2205 2206 // Non-static data members. 2207 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2208 E = ClassDecl->field_end(); I != E; ++I) { 2209 FieldDecl *Field = *I; 2210 if (Field->isInvalidDecl()) 2211 continue; 2212 QualType FieldType = Context.getBaseElementType(Field->getType()); 2213 2214 const RecordType* RT = FieldType->getAs<RecordType>(); 2215 if (!RT) 2216 continue; 2217 2218 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2219 if (FieldClassDecl->hasTrivialDestructor()) 2220 continue; 2221 2222 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2223 CheckDestructorAccess(Field->getLocation(), Dtor, 2224 PDiag(diag::err_access_dtor_field) 2225 << Field->getDeclName() 2226 << FieldType); 2227 2228 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2229 } 2230 2231 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2232 2233 // Bases. 2234 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2235 E = ClassDecl->bases_end(); Base != E; ++Base) { 2236 // Bases are always records in a well-formed non-dependent class. 2237 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2238 2239 // Remember direct virtual bases. 2240 if (Base->isVirtual()) 2241 DirectVirtualBases.insert(RT); 2242 2243 // Ignore trivial destructors. 2244 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2245 if (BaseClassDecl->hasTrivialDestructor()) 2246 continue; 2247 2248 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2249 2250 // FIXME: caret should be on the start of the class name 2251 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2252 PDiag(diag::err_access_dtor_base) 2253 << Base->getType() 2254 << Base->getSourceRange()); 2255 2256 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2257 } 2258 2259 // Virtual bases. 2260 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2261 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2262 2263 // Bases are always records in a well-formed non-dependent class. 2264 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2265 2266 // Ignore direct virtual bases. 2267 if (DirectVirtualBases.count(RT)) 2268 continue; 2269 2270 // Ignore trivial destructors. 2271 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2272 if (BaseClassDecl->hasTrivialDestructor()) 2273 continue; 2274 2275 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2276 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2277 PDiag(diag::err_access_dtor_vbase) 2278 << VBase->getType()); 2279 2280 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2281 } 2282} 2283 2284void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2285 if (!CDtorDecl) 2286 return; 2287 2288 if (CXXConstructorDecl *Constructor 2289 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2290 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2291} 2292 2293bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2294 unsigned DiagID, AbstractDiagSelID SelID) { 2295 if (SelID == -1) 2296 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2297 else 2298 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2299} 2300 2301bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2302 const PartialDiagnostic &PD) { 2303 if (!getLangOptions().CPlusPlus) 2304 return false; 2305 2306 if (const ArrayType *AT = Context.getAsArrayType(T)) 2307 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2308 2309 if (const PointerType *PT = T->getAs<PointerType>()) { 2310 // Find the innermost pointer type. 2311 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2312 PT = T; 2313 2314 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2315 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2316 } 2317 2318 const RecordType *RT = T->getAs<RecordType>(); 2319 if (!RT) 2320 return false; 2321 2322 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2323 2324 // We can't answer whether something is abstract until it has a 2325 // definition. If it's currently being defined, we'll walk back 2326 // over all the declarations when we have a full definition. 2327 const CXXRecordDecl *Def = RD->getDefinition(); 2328 if (!Def || Def->isBeingDefined()) 2329 return false; 2330 2331 if (!RD->isAbstract()) 2332 return false; 2333 2334 Diag(Loc, PD) << RD->getDeclName(); 2335 DiagnoseAbstractType(RD); 2336 2337 return true; 2338} 2339 2340void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2341 // Check if we've already emitted the list of pure virtual functions 2342 // for this class. 2343 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2344 return; 2345 2346 CXXFinalOverriderMap FinalOverriders; 2347 RD->getFinalOverriders(FinalOverriders); 2348 2349 // Keep a set of seen pure methods so we won't diagnose the same method 2350 // more than once. 2351 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2352 2353 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2354 MEnd = FinalOverriders.end(); 2355 M != MEnd; 2356 ++M) { 2357 for (OverridingMethods::iterator SO = M->second.begin(), 2358 SOEnd = M->second.end(); 2359 SO != SOEnd; ++SO) { 2360 // C++ [class.abstract]p4: 2361 // A class is abstract if it contains or inherits at least one 2362 // pure virtual function for which the final overrider is pure 2363 // virtual. 2364 2365 // 2366 if (SO->second.size() != 1) 2367 continue; 2368 2369 if (!SO->second.front().Method->isPure()) 2370 continue; 2371 2372 if (!SeenPureMethods.insert(SO->second.front().Method)) 2373 continue; 2374 2375 Diag(SO->second.front().Method->getLocation(), 2376 diag::note_pure_virtual_function) 2377 << SO->second.front().Method->getDeclName(); 2378 } 2379 } 2380 2381 if (!PureVirtualClassDiagSet) 2382 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2383 PureVirtualClassDiagSet->insert(RD); 2384} 2385 2386namespace { 2387struct AbstractUsageInfo { 2388 Sema &S; 2389 CXXRecordDecl *Record; 2390 CanQualType AbstractType; 2391 bool Invalid; 2392 2393 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2394 : S(S), Record(Record), 2395 AbstractType(S.Context.getCanonicalType( 2396 S.Context.getTypeDeclType(Record))), 2397 Invalid(false) {} 2398 2399 void DiagnoseAbstractType() { 2400 if (Invalid) return; 2401 S.DiagnoseAbstractType(Record); 2402 Invalid = true; 2403 } 2404 2405 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2406}; 2407 2408struct CheckAbstractUsage { 2409 AbstractUsageInfo &Info; 2410 const NamedDecl *Ctx; 2411 2412 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2413 : Info(Info), Ctx(Ctx) {} 2414 2415 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2416 switch (TL.getTypeLocClass()) { 2417#define ABSTRACT_TYPELOC(CLASS, PARENT) 2418#define TYPELOC(CLASS, PARENT) \ 2419 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2420#include "clang/AST/TypeLocNodes.def" 2421 } 2422 } 2423 2424 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2425 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2426 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2427 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2428 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2429 } 2430 } 2431 2432 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2433 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2434 } 2435 2436 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2437 // Visit the type parameters from a permissive context. 2438 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2439 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2440 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2441 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2442 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2443 // TODO: other template argument types? 2444 } 2445 } 2446 2447 // Visit pointee types from a permissive context. 2448#define CheckPolymorphic(Type) \ 2449 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2450 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2451 } 2452 CheckPolymorphic(PointerTypeLoc) 2453 CheckPolymorphic(ReferenceTypeLoc) 2454 CheckPolymorphic(MemberPointerTypeLoc) 2455 CheckPolymorphic(BlockPointerTypeLoc) 2456 2457 /// Handle all the types we haven't given a more specific 2458 /// implementation for above. 2459 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2460 // Every other kind of type that we haven't called out already 2461 // that has an inner type is either (1) sugar or (2) contains that 2462 // inner type in some way as a subobject. 2463 if (TypeLoc Next = TL.getNextTypeLoc()) 2464 return Visit(Next, Sel); 2465 2466 // If there's no inner type and we're in a permissive context, 2467 // don't diagnose. 2468 if (Sel == Sema::AbstractNone) return; 2469 2470 // Check whether the type matches the abstract type. 2471 QualType T = TL.getType(); 2472 if (T->isArrayType()) { 2473 Sel = Sema::AbstractArrayType; 2474 T = Info.S.Context.getBaseElementType(T); 2475 } 2476 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2477 if (CT != Info.AbstractType) return; 2478 2479 // It matched; do some magic. 2480 if (Sel == Sema::AbstractArrayType) { 2481 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2482 << T << TL.getSourceRange(); 2483 } else { 2484 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2485 << Sel << T << TL.getSourceRange(); 2486 } 2487 Info.DiagnoseAbstractType(); 2488 } 2489}; 2490 2491void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2492 Sema::AbstractDiagSelID Sel) { 2493 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2494} 2495 2496} 2497 2498/// Check for invalid uses of an abstract type in a method declaration. 2499static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2500 CXXMethodDecl *MD) { 2501 // No need to do the check on definitions, which require that 2502 // the return/param types be complete. 2503 if (MD->isThisDeclarationADefinition()) 2504 return; 2505 2506 // For safety's sake, just ignore it if we don't have type source 2507 // information. This should never happen for non-implicit methods, 2508 // but... 2509 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2510 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2511} 2512 2513/// Check for invalid uses of an abstract type within a class definition. 2514static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2515 CXXRecordDecl *RD) { 2516 for (CXXRecordDecl::decl_iterator 2517 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2518 Decl *D = *I; 2519 if (D->isImplicit()) continue; 2520 2521 // Methods and method templates. 2522 if (isa<CXXMethodDecl>(D)) { 2523 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2524 } else if (isa<FunctionTemplateDecl>(D)) { 2525 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2526 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2527 2528 // Fields and static variables. 2529 } else if (isa<FieldDecl>(D)) { 2530 FieldDecl *FD = cast<FieldDecl>(D); 2531 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2532 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2533 } else if (isa<VarDecl>(D)) { 2534 VarDecl *VD = cast<VarDecl>(D); 2535 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2536 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2537 2538 // Nested classes and class templates. 2539 } else if (isa<CXXRecordDecl>(D)) { 2540 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2541 } else if (isa<ClassTemplateDecl>(D)) { 2542 CheckAbstractClassUsage(Info, 2543 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2544 } 2545 } 2546} 2547 2548/// \brief Perform semantic checks on a class definition that has been 2549/// completing, introducing implicitly-declared members, checking for 2550/// abstract types, etc. 2551void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2552 if (!Record) 2553 return; 2554 2555 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2556 AbstractUsageInfo Info(*this, Record); 2557 CheckAbstractClassUsage(Info, Record); 2558 } 2559 2560 // If this is not an aggregate type and has no user-declared constructor, 2561 // complain about any non-static data members of reference or const scalar 2562 // type, since they will never get initializers. 2563 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2564 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2565 bool Complained = false; 2566 for (RecordDecl::field_iterator F = Record->field_begin(), 2567 FEnd = Record->field_end(); 2568 F != FEnd; ++F) { 2569 if (F->getType()->isReferenceType() || 2570 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2571 if (!Complained) { 2572 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2573 << Record->getTagKind() << Record; 2574 Complained = true; 2575 } 2576 2577 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2578 << F->getType()->isReferenceType() 2579 << F->getDeclName(); 2580 } 2581 } 2582 } 2583 2584 if (Record->isDynamicClass()) 2585 DynamicClasses.push_back(Record); 2586 2587 if (Record->getIdentifier()) { 2588 // C++ [class.mem]p13: 2589 // If T is the name of a class, then each of the following shall have a 2590 // name different from T: 2591 // - every member of every anonymous union that is a member of class T. 2592 // 2593 // C++ [class.mem]p14: 2594 // In addition, if class T has a user-declared constructor (12.1), every 2595 // non-static data member of class T shall have a name different from T. 2596 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2597 R.first != R.second; ++R.first) 2598 if (FieldDecl *Field = dyn_cast<FieldDecl>(*R.first)) { 2599 if (Record->hasUserDeclaredConstructor() || 2600 !Field->getDeclContext()->Equals(Record)) { 2601 Diag(Field->getLocation(), diag::err_member_name_of_class) 2602 << Field->getDeclName(); 2603 break; 2604 } 2605 } 2606 } 2607} 2608 2609void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2610 Decl *TagDecl, 2611 SourceLocation LBrac, 2612 SourceLocation RBrac, 2613 AttributeList *AttrList) { 2614 if (!TagDecl) 2615 return; 2616 2617 AdjustDeclIfTemplate(TagDecl); 2618 2619 ActOnFields(S, RLoc, TagDecl, 2620 // strict aliasing violation! 2621 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2622 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2623 2624 CheckCompletedCXXClass( 2625 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2626} 2627 2628namespace { 2629 /// \brief Helper class that collects exception specifications for 2630 /// implicitly-declared special member functions. 2631 class ImplicitExceptionSpecification { 2632 ASTContext &Context; 2633 bool AllowsAllExceptions; 2634 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2635 llvm::SmallVector<QualType, 4> Exceptions; 2636 2637 public: 2638 explicit ImplicitExceptionSpecification(ASTContext &Context) 2639 : Context(Context), AllowsAllExceptions(false) { } 2640 2641 /// \brief Whether the special member function should have any 2642 /// exception specification at all. 2643 bool hasExceptionSpecification() const { 2644 return !AllowsAllExceptions; 2645 } 2646 2647 /// \brief Whether the special member function should have a 2648 /// throw(...) exception specification (a Microsoft extension). 2649 bool hasAnyExceptionSpecification() const { 2650 return false; 2651 } 2652 2653 /// \brief The number of exceptions in the exception specification. 2654 unsigned size() const { return Exceptions.size(); } 2655 2656 /// \brief The set of exceptions in the exception specification. 2657 const QualType *data() const { return Exceptions.data(); } 2658 2659 /// \brief Note that 2660 void CalledDecl(CXXMethodDecl *Method) { 2661 // If we already know that we allow all exceptions, do nothing. 2662 if (AllowsAllExceptions || !Method) 2663 return; 2664 2665 const FunctionProtoType *Proto 2666 = Method->getType()->getAs<FunctionProtoType>(); 2667 2668 // If this function can throw any exceptions, make a note of that. 2669 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2670 AllowsAllExceptions = true; 2671 ExceptionsSeen.clear(); 2672 Exceptions.clear(); 2673 return; 2674 } 2675 2676 // Record the exceptions in this function's exception specification. 2677 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2678 EEnd = Proto->exception_end(); 2679 E != EEnd; ++E) 2680 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2681 Exceptions.push_back(*E); 2682 } 2683 }; 2684} 2685 2686 2687/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2688/// special functions, such as the default constructor, copy 2689/// constructor, or destructor, to the given C++ class (C++ 2690/// [special]p1). This routine can only be executed just before the 2691/// definition of the class is complete. 2692void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2693 if (!ClassDecl->hasUserDeclaredConstructor()) 2694 ++ASTContext::NumImplicitDefaultConstructors; 2695 2696 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2697 ++ASTContext::NumImplicitCopyConstructors; 2698 2699 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2700 ++ASTContext::NumImplicitCopyAssignmentOperators; 2701 2702 // If we have a dynamic class, then the copy assignment operator may be 2703 // virtual, so we have to declare it immediately. This ensures that, e.g., 2704 // it shows up in the right place in the vtable and that we diagnose 2705 // problems with the implicit exception specification. 2706 if (ClassDecl->isDynamicClass()) 2707 DeclareImplicitCopyAssignment(ClassDecl); 2708 } 2709 2710 if (!ClassDecl->hasUserDeclaredDestructor()) { 2711 ++ASTContext::NumImplicitDestructors; 2712 2713 // If we have a dynamic class, then the destructor may be virtual, so we 2714 // have to declare the destructor immediately. This ensures that, e.g., it 2715 // shows up in the right place in the vtable and that we diagnose problems 2716 // with the implicit exception specification. 2717 if (ClassDecl->isDynamicClass()) 2718 DeclareImplicitDestructor(ClassDecl); 2719 } 2720} 2721 2722void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2723 if (!D) 2724 return; 2725 2726 TemplateParameterList *Params = 0; 2727 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2728 Params = Template->getTemplateParameters(); 2729 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2730 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2731 Params = PartialSpec->getTemplateParameters(); 2732 else 2733 return; 2734 2735 for (TemplateParameterList::iterator Param = Params->begin(), 2736 ParamEnd = Params->end(); 2737 Param != ParamEnd; ++Param) { 2738 NamedDecl *Named = cast<NamedDecl>(*Param); 2739 if (Named->getDeclName()) { 2740 S->AddDecl(Named); 2741 IdResolver.AddDecl(Named); 2742 } 2743 } 2744} 2745 2746void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2747 if (!RecordD) return; 2748 AdjustDeclIfTemplate(RecordD); 2749 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2750 PushDeclContext(S, Record); 2751} 2752 2753void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2754 if (!RecordD) return; 2755 PopDeclContext(); 2756} 2757 2758/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2759/// parsing a top-level (non-nested) C++ class, and we are now 2760/// parsing those parts of the given Method declaration that could 2761/// not be parsed earlier (C++ [class.mem]p2), such as default 2762/// arguments. This action should enter the scope of the given 2763/// Method declaration as if we had just parsed the qualified method 2764/// name. However, it should not bring the parameters into scope; 2765/// that will be performed by ActOnDelayedCXXMethodParameter. 2766void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2767} 2768 2769/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2770/// C++ method declaration. We're (re-)introducing the given 2771/// function parameter into scope for use in parsing later parts of 2772/// the method declaration. For example, we could see an 2773/// ActOnParamDefaultArgument event for this parameter. 2774void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2775 if (!ParamD) 2776 return; 2777 2778 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2779 2780 // If this parameter has an unparsed default argument, clear it out 2781 // to make way for the parsed default argument. 2782 if (Param->hasUnparsedDefaultArg()) 2783 Param->setDefaultArg(0); 2784 2785 S->AddDecl(Param); 2786 if (Param->getDeclName()) 2787 IdResolver.AddDecl(Param); 2788} 2789 2790/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2791/// processing the delayed method declaration for Method. The method 2792/// declaration is now considered finished. There may be a separate 2793/// ActOnStartOfFunctionDef action later (not necessarily 2794/// immediately!) for this method, if it was also defined inside the 2795/// class body. 2796void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2797 if (!MethodD) 2798 return; 2799 2800 AdjustDeclIfTemplate(MethodD); 2801 2802 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2803 2804 // Now that we have our default arguments, check the constructor 2805 // again. It could produce additional diagnostics or affect whether 2806 // the class has implicitly-declared destructors, among other 2807 // things. 2808 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2809 CheckConstructor(Constructor); 2810 2811 // Check the default arguments, which we may have added. 2812 if (!Method->isInvalidDecl()) 2813 CheckCXXDefaultArguments(Method); 2814} 2815 2816/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2817/// the well-formedness of the constructor declarator @p D with type @p 2818/// R. If there are any errors in the declarator, this routine will 2819/// emit diagnostics and set the invalid bit to true. In any case, the type 2820/// will be updated to reflect a well-formed type for the constructor and 2821/// returned. 2822QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2823 StorageClass &SC) { 2824 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2825 2826 // C++ [class.ctor]p3: 2827 // A constructor shall not be virtual (10.3) or static (9.4). A 2828 // constructor can be invoked for a const, volatile or const 2829 // volatile object. A constructor shall not be declared const, 2830 // volatile, or const volatile (9.3.2). 2831 if (isVirtual) { 2832 if (!D.isInvalidType()) 2833 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2834 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2835 << SourceRange(D.getIdentifierLoc()); 2836 D.setInvalidType(); 2837 } 2838 if (SC == SC_Static) { 2839 if (!D.isInvalidType()) 2840 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2841 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2842 << SourceRange(D.getIdentifierLoc()); 2843 D.setInvalidType(); 2844 SC = SC_None; 2845 } 2846 2847 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2848 if (FTI.TypeQuals != 0) { 2849 if (FTI.TypeQuals & Qualifiers::Const) 2850 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2851 << "const" << SourceRange(D.getIdentifierLoc()); 2852 if (FTI.TypeQuals & Qualifiers::Volatile) 2853 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2854 << "volatile" << SourceRange(D.getIdentifierLoc()); 2855 if (FTI.TypeQuals & Qualifiers::Restrict) 2856 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2857 << "restrict" << SourceRange(D.getIdentifierLoc()); 2858 } 2859 2860 // Rebuild the function type "R" without any type qualifiers (in 2861 // case any of the errors above fired) and with "void" as the 2862 // return type, since constructors don't have return types. 2863 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2864 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2865 Proto->getNumArgs(), 2866 Proto->isVariadic(), 0, 2867 Proto->hasExceptionSpec(), 2868 Proto->hasAnyExceptionSpec(), 2869 Proto->getNumExceptions(), 2870 Proto->exception_begin(), 2871 Proto->getExtInfo()); 2872} 2873 2874/// CheckConstructor - Checks a fully-formed constructor for 2875/// well-formedness, issuing any diagnostics required. Returns true if 2876/// the constructor declarator is invalid. 2877void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2878 CXXRecordDecl *ClassDecl 2879 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2880 if (!ClassDecl) 2881 return Constructor->setInvalidDecl(); 2882 2883 // C++ [class.copy]p3: 2884 // A declaration of a constructor for a class X is ill-formed if 2885 // its first parameter is of type (optionally cv-qualified) X and 2886 // either there are no other parameters or else all other 2887 // parameters have default arguments. 2888 if (!Constructor->isInvalidDecl() && 2889 ((Constructor->getNumParams() == 1) || 2890 (Constructor->getNumParams() > 1 && 2891 Constructor->getParamDecl(1)->hasDefaultArg())) && 2892 Constructor->getTemplateSpecializationKind() 2893 != TSK_ImplicitInstantiation) { 2894 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2895 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2896 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2897 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2898 const char *ConstRef 2899 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2900 : " const &"; 2901 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2902 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2903 2904 // FIXME: Rather that making the constructor invalid, we should endeavor 2905 // to fix the type. 2906 Constructor->setInvalidDecl(); 2907 } 2908 } 2909} 2910 2911/// CheckDestructor - Checks a fully-formed destructor definition for 2912/// well-formedness, issuing any diagnostics required. Returns true 2913/// on error. 2914bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2915 CXXRecordDecl *RD = Destructor->getParent(); 2916 2917 if (Destructor->isVirtual()) { 2918 SourceLocation Loc; 2919 2920 if (!Destructor->isImplicit()) 2921 Loc = Destructor->getLocation(); 2922 else 2923 Loc = RD->getLocation(); 2924 2925 // If we have a virtual destructor, look up the deallocation function 2926 FunctionDecl *OperatorDelete = 0; 2927 DeclarationName Name = 2928 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2929 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2930 return true; 2931 2932 MarkDeclarationReferenced(Loc, OperatorDelete); 2933 2934 Destructor->setOperatorDelete(OperatorDelete); 2935 } 2936 2937 return false; 2938} 2939 2940static inline bool 2941FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2942 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2943 FTI.ArgInfo[0].Param && 2944 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 2945} 2946 2947/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2948/// the well-formednes of the destructor declarator @p D with type @p 2949/// R. If there are any errors in the declarator, this routine will 2950/// emit diagnostics and set the declarator to invalid. Even if this happens, 2951/// will be updated to reflect a well-formed type for the destructor and 2952/// returned. 2953QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2954 StorageClass& SC) { 2955 // C++ [class.dtor]p1: 2956 // [...] A typedef-name that names a class is a class-name 2957 // (7.1.3); however, a typedef-name that names a class shall not 2958 // be used as the identifier in the declarator for a destructor 2959 // declaration. 2960 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2961 if (isa<TypedefType>(DeclaratorType)) 2962 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2963 << DeclaratorType; 2964 2965 // C++ [class.dtor]p2: 2966 // A destructor is used to destroy objects of its class type. A 2967 // destructor takes no parameters, and no return type can be 2968 // specified for it (not even void). The address of a destructor 2969 // shall not be taken. A destructor shall not be static. A 2970 // destructor can be invoked for a const, volatile or const 2971 // volatile object. A destructor shall not be declared const, 2972 // volatile or const volatile (9.3.2). 2973 if (SC == SC_Static) { 2974 if (!D.isInvalidType()) 2975 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2976 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2977 << SourceRange(D.getIdentifierLoc()) 2978 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2979 2980 SC = SC_None; 2981 } 2982 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2983 // Destructors don't have return types, but the parser will 2984 // happily parse something like: 2985 // 2986 // class X { 2987 // float ~X(); 2988 // }; 2989 // 2990 // The return type will be eliminated later. 2991 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2992 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2993 << SourceRange(D.getIdentifierLoc()); 2994 } 2995 2996 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2997 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2998 if (FTI.TypeQuals & Qualifiers::Const) 2999 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3000 << "const" << SourceRange(D.getIdentifierLoc()); 3001 if (FTI.TypeQuals & Qualifiers::Volatile) 3002 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3003 << "volatile" << SourceRange(D.getIdentifierLoc()); 3004 if (FTI.TypeQuals & Qualifiers::Restrict) 3005 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3006 << "restrict" << SourceRange(D.getIdentifierLoc()); 3007 D.setInvalidType(); 3008 } 3009 3010 // Make sure we don't have any parameters. 3011 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3012 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3013 3014 // Delete the parameters. 3015 FTI.freeArgs(); 3016 D.setInvalidType(); 3017 } 3018 3019 // Make sure the destructor isn't variadic. 3020 if (FTI.isVariadic) { 3021 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3022 D.setInvalidType(); 3023 } 3024 3025 // Rebuild the function type "R" without any type qualifiers or 3026 // parameters (in case any of the errors above fired) and with 3027 // "void" as the return type, since destructors don't have return 3028 // types. 3029 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3030 if (!Proto) 3031 return QualType(); 3032 3033 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3034 Proto->hasExceptionSpec(), 3035 Proto->hasAnyExceptionSpec(), 3036 Proto->getNumExceptions(), 3037 Proto->exception_begin(), 3038 Proto->getExtInfo()); 3039} 3040 3041/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3042/// well-formednes of the conversion function declarator @p D with 3043/// type @p R. If there are any errors in the declarator, this routine 3044/// will emit diagnostics and return true. Otherwise, it will return 3045/// false. Either way, the type @p R will be updated to reflect a 3046/// well-formed type for the conversion operator. 3047void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3048 StorageClass& SC) { 3049 // C++ [class.conv.fct]p1: 3050 // Neither parameter types nor return type can be specified. The 3051 // type of a conversion function (8.3.5) is "function taking no 3052 // parameter returning conversion-type-id." 3053 if (SC == SC_Static) { 3054 if (!D.isInvalidType()) 3055 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3056 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3057 << SourceRange(D.getIdentifierLoc()); 3058 D.setInvalidType(); 3059 SC = SC_None; 3060 } 3061 3062 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3063 3064 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3065 // Conversion functions don't have return types, but the parser will 3066 // happily parse something like: 3067 // 3068 // class X { 3069 // float operator bool(); 3070 // }; 3071 // 3072 // The return type will be changed later anyway. 3073 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3074 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3075 << SourceRange(D.getIdentifierLoc()); 3076 D.setInvalidType(); 3077 } 3078 3079 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3080 3081 // Make sure we don't have any parameters. 3082 if (Proto->getNumArgs() > 0) { 3083 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3084 3085 // Delete the parameters. 3086 D.getTypeObject(0).Fun.freeArgs(); 3087 D.setInvalidType(); 3088 } else if (Proto->isVariadic()) { 3089 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3090 D.setInvalidType(); 3091 } 3092 3093 // Diagnose "&operator bool()" and other such nonsense. This 3094 // is actually a gcc extension which we don't support. 3095 if (Proto->getResultType() != ConvType) { 3096 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3097 << Proto->getResultType(); 3098 D.setInvalidType(); 3099 ConvType = Proto->getResultType(); 3100 } 3101 3102 // C++ [class.conv.fct]p4: 3103 // The conversion-type-id shall not represent a function type nor 3104 // an array type. 3105 if (ConvType->isArrayType()) { 3106 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3107 ConvType = Context.getPointerType(ConvType); 3108 D.setInvalidType(); 3109 } else if (ConvType->isFunctionType()) { 3110 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3111 ConvType = Context.getPointerType(ConvType); 3112 D.setInvalidType(); 3113 } 3114 3115 // Rebuild the function type "R" without any parameters (in case any 3116 // of the errors above fired) and with the conversion type as the 3117 // return type. 3118 if (D.isInvalidType()) { 3119 R = Context.getFunctionType(ConvType, 0, 0, false, 3120 Proto->getTypeQuals(), 3121 Proto->hasExceptionSpec(), 3122 Proto->hasAnyExceptionSpec(), 3123 Proto->getNumExceptions(), 3124 Proto->exception_begin(), 3125 Proto->getExtInfo()); 3126 } 3127 3128 // C++0x explicit conversion operators. 3129 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3130 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3131 diag::warn_explicit_conversion_functions) 3132 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3133} 3134 3135/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3136/// the declaration of the given C++ conversion function. This routine 3137/// is responsible for recording the conversion function in the C++ 3138/// class, if possible. 3139Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3140 assert(Conversion && "Expected to receive a conversion function declaration"); 3141 3142 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3143 3144 // Make sure we aren't redeclaring the conversion function. 3145 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3146 3147 // C++ [class.conv.fct]p1: 3148 // [...] A conversion function is never used to convert a 3149 // (possibly cv-qualified) object to the (possibly cv-qualified) 3150 // same object type (or a reference to it), to a (possibly 3151 // cv-qualified) base class of that type (or a reference to it), 3152 // or to (possibly cv-qualified) void. 3153 // FIXME: Suppress this warning if the conversion function ends up being a 3154 // virtual function that overrides a virtual function in a base class. 3155 QualType ClassType 3156 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3157 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3158 ConvType = ConvTypeRef->getPointeeType(); 3159 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3160 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3161 /* Suppress diagnostics for instantiations. */; 3162 else if (ConvType->isRecordType()) { 3163 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3164 if (ConvType == ClassType) 3165 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3166 << ClassType; 3167 else if (IsDerivedFrom(ClassType, ConvType)) 3168 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3169 << ClassType << ConvType; 3170 } else if (ConvType->isVoidType()) { 3171 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3172 << ClassType << ConvType; 3173 } 3174 3175 if (FunctionTemplateDecl *ConversionTemplate 3176 = Conversion->getDescribedFunctionTemplate()) 3177 return ConversionTemplate; 3178 3179 return Conversion; 3180} 3181 3182//===----------------------------------------------------------------------===// 3183// Namespace Handling 3184//===----------------------------------------------------------------------===// 3185 3186 3187 3188/// ActOnStartNamespaceDef - This is called at the start of a namespace 3189/// definition. 3190Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3191 SourceLocation InlineLoc, 3192 SourceLocation IdentLoc, 3193 IdentifierInfo *II, 3194 SourceLocation LBrace, 3195 AttributeList *AttrList) { 3196 // anonymous namespace starts at its left brace 3197 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3198 (II ? IdentLoc : LBrace) , II); 3199 Namespc->setLBracLoc(LBrace); 3200 Namespc->setInline(InlineLoc.isValid()); 3201 3202 Scope *DeclRegionScope = NamespcScope->getParent(); 3203 3204 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3205 3206 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3207 PushVisibilityAttr(attr); 3208 3209 if (II) { 3210 // C++ [namespace.def]p2: 3211 // The identifier in an original-namespace-definition shall not 3212 // have been previously defined in the declarative region in 3213 // which the original-namespace-definition appears. The 3214 // identifier in an original-namespace-definition is the name of 3215 // the namespace. Subsequently in that declarative region, it is 3216 // treated as an original-namespace-name. 3217 // 3218 // Since namespace names are unique in their scope, and we don't 3219 // look through using directives, just 3220 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3221 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3222 3223 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3224 // This is an extended namespace definition. 3225 if (Namespc->isInline() != OrigNS->isInline()) { 3226 // inline-ness must match 3227 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3228 << Namespc->isInline(); 3229 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3230 Namespc->setInvalidDecl(); 3231 // Recover by ignoring the new namespace's inline status. 3232 Namespc->setInline(OrigNS->isInline()); 3233 } 3234 3235 // Attach this namespace decl to the chain of extended namespace 3236 // definitions. 3237 OrigNS->setNextNamespace(Namespc); 3238 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3239 3240 // Remove the previous declaration from the scope. 3241 if (DeclRegionScope->isDeclScope(OrigNS)) { 3242 IdResolver.RemoveDecl(OrigNS); 3243 DeclRegionScope->RemoveDecl(OrigNS); 3244 } 3245 } else if (PrevDecl) { 3246 // This is an invalid name redefinition. 3247 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3248 << Namespc->getDeclName(); 3249 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3250 Namespc->setInvalidDecl(); 3251 // Continue on to push Namespc as current DeclContext and return it. 3252 } else if (II->isStr("std") && 3253 CurContext->getRedeclContext()->isTranslationUnit()) { 3254 // This is the first "real" definition of the namespace "std", so update 3255 // our cache of the "std" namespace to point at this definition. 3256 if (NamespaceDecl *StdNS = getStdNamespace()) { 3257 // We had already defined a dummy namespace "std". Link this new 3258 // namespace definition to the dummy namespace "std". 3259 StdNS->setNextNamespace(Namespc); 3260 StdNS->setLocation(IdentLoc); 3261 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3262 } 3263 3264 // Make our StdNamespace cache point at the first real definition of the 3265 // "std" namespace. 3266 StdNamespace = Namespc; 3267 } 3268 3269 PushOnScopeChains(Namespc, DeclRegionScope); 3270 } else { 3271 // Anonymous namespaces. 3272 assert(Namespc->isAnonymousNamespace()); 3273 3274 // Link the anonymous namespace into its parent. 3275 NamespaceDecl *PrevDecl; 3276 DeclContext *Parent = CurContext->getRedeclContext(); 3277 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3278 PrevDecl = TU->getAnonymousNamespace(); 3279 TU->setAnonymousNamespace(Namespc); 3280 } else { 3281 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3282 PrevDecl = ND->getAnonymousNamespace(); 3283 ND->setAnonymousNamespace(Namespc); 3284 } 3285 3286 // Link the anonymous namespace with its previous declaration. 3287 if (PrevDecl) { 3288 assert(PrevDecl->isAnonymousNamespace()); 3289 assert(!PrevDecl->getNextNamespace()); 3290 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3291 PrevDecl->setNextNamespace(Namespc); 3292 3293 if (Namespc->isInline() != PrevDecl->isInline()) { 3294 // inline-ness must match 3295 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3296 << Namespc->isInline(); 3297 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3298 Namespc->setInvalidDecl(); 3299 // Recover by ignoring the new namespace's inline status. 3300 Namespc->setInline(PrevDecl->isInline()); 3301 } 3302 } 3303 3304 CurContext->addDecl(Namespc); 3305 3306 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3307 // behaves as if it were replaced by 3308 // namespace unique { /* empty body */ } 3309 // using namespace unique; 3310 // namespace unique { namespace-body } 3311 // where all occurrences of 'unique' in a translation unit are 3312 // replaced by the same identifier and this identifier differs 3313 // from all other identifiers in the entire program. 3314 3315 // We just create the namespace with an empty name and then add an 3316 // implicit using declaration, just like the standard suggests. 3317 // 3318 // CodeGen enforces the "universally unique" aspect by giving all 3319 // declarations semantically contained within an anonymous 3320 // namespace internal linkage. 3321 3322 if (!PrevDecl) { 3323 UsingDirectiveDecl* UD 3324 = UsingDirectiveDecl::Create(Context, CurContext, 3325 /* 'using' */ LBrace, 3326 /* 'namespace' */ SourceLocation(), 3327 /* qualifier */ SourceRange(), 3328 /* NNS */ NULL, 3329 /* identifier */ SourceLocation(), 3330 Namespc, 3331 /* Ancestor */ CurContext); 3332 UD->setImplicit(); 3333 CurContext->addDecl(UD); 3334 } 3335 } 3336 3337 // Although we could have an invalid decl (i.e. the namespace name is a 3338 // redefinition), push it as current DeclContext and try to continue parsing. 3339 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3340 // for the namespace has the declarations that showed up in that particular 3341 // namespace definition. 3342 PushDeclContext(NamespcScope, Namespc); 3343 return Namespc; 3344} 3345 3346/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3347/// is a namespace alias, returns the namespace it points to. 3348static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3349 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3350 return AD->getNamespace(); 3351 return dyn_cast_or_null<NamespaceDecl>(D); 3352} 3353 3354/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3355/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3356void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3357 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3358 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3359 Namespc->setRBracLoc(RBrace); 3360 PopDeclContext(); 3361 if (Namespc->hasAttr<VisibilityAttr>()) 3362 PopPragmaVisibility(); 3363} 3364 3365CXXRecordDecl *Sema::getStdBadAlloc() const { 3366 return cast_or_null<CXXRecordDecl>( 3367 StdBadAlloc.get(Context.getExternalSource())); 3368} 3369 3370NamespaceDecl *Sema::getStdNamespace() const { 3371 return cast_or_null<NamespaceDecl>( 3372 StdNamespace.get(Context.getExternalSource())); 3373} 3374 3375/// \brief Retrieve the special "std" namespace, which may require us to 3376/// implicitly define the namespace. 3377NamespaceDecl *Sema::getOrCreateStdNamespace() { 3378 if (!StdNamespace) { 3379 // The "std" namespace has not yet been defined, so build one implicitly. 3380 StdNamespace = NamespaceDecl::Create(Context, 3381 Context.getTranslationUnitDecl(), 3382 SourceLocation(), 3383 &PP.getIdentifierTable().get("std")); 3384 getStdNamespace()->setImplicit(true); 3385 } 3386 3387 return getStdNamespace(); 3388} 3389 3390Decl *Sema::ActOnUsingDirective(Scope *S, 3391 SourceLocation UsingLoc, 3392 SourceLocation NamespcLoc, 3393 CXXScopeSpec &SS, 3394 SourceLocation IdentLoc, 3395 IdentifierInfo *NamespcName, 3396 AttributeList *AttrList) { 3397 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3398 assert(NamespcName && "Invalid NamespcName."); 3399 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3400 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3401 3402 UsingDirectiveDecl *UDir = 0; 3403 NestedNameSpecifier *Qualifier = 0; 3404 if (SS.isSet()) 3405 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3406 3407 // Lookup namespace name. 3408 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3409 LookupParsedName(R, S, &SS); 3410 if (R.isAmbiguous()) 3411 return 0; 3412 3413 if (R.empty()) { 3414 // Allow "using namespace std;" or "using namespace ::std;" even if 3415 // "std" hasn't been defined yet, for GCC compatibility. 3416 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3417 NamespcName->isStr("std")) { 3418 Diag(IdentLoc, diag::ext_using_undefined_std); 3419 R.addDecl(getOrCreateStdNamespace()); 3420 R.resolveKind(); 3421 } 3422 // Otherwise, attempt typo correction. 3423 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3424 CTC_NoKeywords, 0)) { 3425 if (R.getAsSingle<NamespaceDecl>() || 3426 R.getAsSingle<NamespaceAliasDecl>()) { 3427 if (DeclContext *DC = computeDeclContext(SS, false)) 3428 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3429 << NamespcName << DC << Corrected << SS.getRange() 3430 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3431 else 3432 Diag(IdentLoc, diag::err_using_directive_suggest) 3433 << NamespcName << Corrected 3434 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3435 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3436 << Corrected; 3437 3438 NamespcName = Corrected.getAsIdentifierInfo(); 3439 } else { 3440 R.clear(); 3441 R.setLookupName(NamespcName); 3442 } 3443 } 3444 } 3445 3446 if (!R.empty()) { 3447 NamedDecl *Named = R.getFoundDecl(); 3448 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3449 && "expected namespace decl"); 3450 // C++ [namespace.udir]p1: 3451 // A using-directive specifies that the names in the nominated 3452 // namespace can be used in the scope in which the 3453 // using-directive appears after the using-directive. During 3454 // unqualified name lookup (3.4.1), the names appear as if they 3455 // were declared in the nearest enclosing namespace which 3456 // contains both the using-directive and the nominated 3457 // namespace. [Note: in this context, "contains" means "contains 3458 // directly or indirectly". ] 3459 3460 // Find enclosing context containing both using-directive and 3461 // nominated namespace. 3462 NamespaceDecl *NS = getNamespaceDecl(Named); 3463 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3464 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3465 CommonAncestor = CommonAncestor->getParent(); 3466 3467 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3468 SS.getRange(), 3469 (NestedNameSpecifier *)SS.getScopeRep(), 3470 IdentLoc, Named, CommonAncestor); 3471 PushUsingDirective(S, UDir); 3472 } else { 3473 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3474 } 3475 3476 // FIXME: We ignore attributes for now. 3477 delete AttrList; 3478 return UDir; 3479} 3480 3481void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3482 // If scope has associated entity, then using directive is at namespace 3483 // or translation unit scope. We add UsingDirectiveDecls, into 3484 // it's lookup structure. 3485 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3486 Ctx->addDecl(UDir); 3487 else 3488 // Otherwise it is block-sope. using-directives will affect lookup 3489 // only to the end of scope. 3490 S->PushUsingDirective(UDir); 3491} 3492 3493 3494Decl *Sema::ActOnUsingDeclaration(Scope *S, 3495 AccessSpecifier AS, 3496 bool HasUsingKeyword, 3497 SourceLocation UsingLoc, 3498 CXXScopeSpec &SS, 3499 UnqualifiedId &Name, 3500 AttributeList *AttrList, 3501 bool IsTypeName, 3502 SourceLocation TypenameLoc) { 3503 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3504 3505 switch (Name.getKind()) { 3506 case UnqualifiedId::IK_Identifier: 3507 case UnqualifiedId::IK_OperatorFunctionId: 3508 case UnqualifiedId::IK_LiteralOperatorId: 3509 case UnqualifiedId::IK_ConversionFunctionId: 3510 break; 3511 3512 case UnqualifiedId::IK_ConstructorName: 3513 case UnqualifiedId::IK_ConstructorTemplateId: 3514 // C++0x inherited constructors. 3515 if (getLangOptions().CPlusPlus0x) break; 3516 3517 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3518 << SS.getRange(); 3519 return 0; 3520 3521 case UnqualifiedId::IK_DestructorName: 3522 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3523 << SS.getRange(); 3524 return 0; 3525 3526 case UnqualifiedId::IK_TemplateId: 3527 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3528 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3529 return 0; 3530 } 3531 3532 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3533 DeclarationName TargetName = TargetNameInfo.getName(); 3534 if (!TargetName) 3535 return 0; 3536 3537 // Warn about using declarations. 3538 // TODO: store that the declaration was written without 'using' and 3539 // talk about access decls instead of using decls in the 3540 // diagnostics. 3541 if (!HasUsingKeyword) { 3542 UsingLoc = Name.getSourceRange().getBegin(); 3543 3544 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3545 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3546 } 3547 3548 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3549 TargetNameInfo, AttrList, 3550 /* IsInstantiation */ false, 3551 IsTypeName, TypenameLoc); 3552 if (UD) 3553 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3554 3555 return UD; 3556} 3557 3558/// \brief Determine whether a using declaration considers the given 3559/// declarations as "equivalent", e.g., if they are redeclarations of 3560/// the same entity or are both typedefs of the same type. 3561static bool 3562IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3563 bool &SuppressRedeclaration) { 3564 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3565 SuppressRedeclaration = false; 3566 return true; 3567 } 3568 3569 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3570 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3571 SuppressRedeclaration = true; 3572 return Context.hasSameType(TD1->getUnderlyingType(), 3573 TD2->getUnderlyingType()); 3574 } 3575 3576 return false; 3577} 3578 3579 3580/// Determines whether to create a using shadow decl for a particular 3581/// decl, given the set of decls existing prior to this using lookup. 3582bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3583 const LookupResult &Previous) { 3584 // Diagnose finding a decl which is not from a base class of the 3585 // current class. We do this now because there are cases where this 3586 // function will silently decide not to build a shadow decl, which 3587 // will pre-empt further diagnostics. 3588 // 3589 // We don't need to do this in C++0x because we do the check once on 3590 // the qualifier. 3591 // 3592 // FIXME: diagnose the following if we care enough: 3593 // struct A { int foo; }; 3594 // struct B : A { using A::foo; }; 3595 // template <class T> struct C : A {}; 3596 // template <class T> struct D : C<T> { using B::foo; } // <--- 3597 // This is invalid (during instantiation) in C++03 because B::foo 3598 // resolves to the using decl in B, which is not a base class of D<T>. 3599 // We can't diagnose it immediately because C<T> is an unknown 3600 // specialization. The UsingShadowDecl in D<T> then points directly 3601 // to A::foo, which will look well-formed when we instantiate. 3602 // The right solution is to not collapse the shadow-decl chain. 3603 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3604 DeclContext *OrigDC = Orig->getDeclContext(); 3605 3606 // Handle enums and anonymous structs. 3607 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3608 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3609 while (OrigRec->isAnonymousStructOrUnion()) 3610 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3611 3612 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3613 if (OrigDC == CurContext) { 3614 Diag(Using->getLocation(), 3615 diag::err_using_decl_nested_name_specifier_is_current_class) 3616 << Using->getNestedNameRange(); 3617 Diag(Orig->getLocation(), diag::note_using_decl_target); 3618 return true; 3619 } 3620 3621 Diag(Using->getNestedNameRange().getBegin(), 3622 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3623 << Using->getTargetNestedNameDecl() 3624 << cast<CXXRecordDecl>(CurContext) 3625 << Using->getNestedNameRange(); 3626 Diag(Orig->getLocation(), diag::note_using_decl_target); 3627 return true; 3628 } 3629 } 3630 3631 if (Previous.empty()) return false; 3632 3633 NamedDecl *Target = Orig; 3634 if (isa<UsingShadowDecl>(Target)) 3635 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3636 3637 // If the target happens to be one of the previous declarations, we 3638 // don't have a conflict. 3639 // 3640 // FIXME: but we might be increasing its access, in which case we 3641 // should redeclare it. 3642 NamedDecl *NonTag = 0, *Tag = 0; 3643 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3644 I != E; ++I) { 3645 NamedDecl *D = (*I)->getUnderlyingDecl(); 3646 bool Result; 3647 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3648 return Result; 3649 3650 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3651 } 3652 3653 if (Target->isFunctionOrFunctionTemplate()) { 3654 FunctionDecl *FD; 3655 if (isa<FunctionTemplateDecl>(Target)) 3656 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3657 else 3658 FD = cast<FunctionDecl>(Target); 3659 3660 NamedDecl *OldDecl = 0; 3661 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3662 case Ovl_Overload: 3663 return false; 3664 3665 case Ovl_NonFunction: 3666 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3667 break; 3668 3669 // We found a decl with the exact signature. 3670 case Ovl_Match: 3671 // If we're in a record, we want to hide the target, so we 3672 // return true (without a diagnostic) to tell the caller not to 3673 // build a shadow decl. 3674 if (CurContext->isRecord()) 3675 return true; 3676 3677 // If we're not in a record, this is an error. 3678 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3679 break; 3680 } 3681 3682 Diag(Target->getLocation(), diag::note_using_decl_target); 3683 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3684 return true; 3685 } 3686 3687 // Target is not a function. 3688 3689 if (isa<TagDecl>(Target)) { 3690 // No conflict between a tag and a non-tag. 3691 if (!Tag) return false; 3692 3693 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3694 Diag(Target->getLocation(), diag::note_using_decl_target); 3695 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3696 return true; 3697 } 3698 3699 // No conflict between a tag and a non-tag. 3700 if (!NonTag) return false; 3701 3702 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3703 Diag(Target->getLocation(), diag::note_using_decl_target); 3704 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3705 return true; 3706} 3707 3708/// Builds a shadow declaration corresponding to a 'using' declaration. 3709UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3710 UsingDecl *UD, 3711 NamedDecl *Orig) { 3712 3713 // If we resolved to another shadow declaration, just coalesce them. 3714 NamedDecl *Target = Orig; 3715 if (isa<UsingShadowDecl>(Target)) { 3716 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3717 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3718 } 3719 3720 UsingShadowDecl *Shadow 3721 = UsingShadowDecl::Create(Context, CurContext, 3722 UD->getLocation(), UD, Target); 3723 UD->addShadowDecl(Shadow); 3724 3725 Shadow->setAccess(UD->getAccess()); 3726 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3727 Shadow->setInvalidDecl(); 3728 3729 if (S) 3730 PushOnScopeChains(Shadow, S); 3731 else 3732 CurContext->addDecl(Shadow); 3733 3734 3735 return Shadow; 3736} 3737 3738/// Hides a using shadow declaration. This is required by the current 3739/// using-decl implementation when a resolvable using declaration in a 3740/// class is followed by a declaration which would hide or override 3741/// one or more of the using decl's targets; for example: 3742/// 3743/// struct Base { void foo(int); }; 3744/// struct Derived : Base { 3745/// using Base::foo; 3746/// void foo(int); 3747/// }; 3748/// 3749/// The governing language is C++03 [namespace.udecl]p12: 3750/// 3751/// When a using-declaration brings names from a base class into a 3752/// derived class scope, member functions in the derived class 3753/// override and/or hide member functions with the same name and 3754/// parameter types in a base class (rather than conflicting). 3755/// 3756/// There are two ways to implement this: 3757/// (1) optimistically create shadow decls when they're not hidden 3758/// by existing declarations, or 3759/// (2) don't create any shadow decls (or at least don't make them 3760/// visible) until we've fully parsed/instantiated the class. 3761/// The problem with (1) is that we might have to retroactively remove 3762/// a shadow decl, which requires several O(n) operations because the 3763/// decl structures are (very reasonably) not designed for removal. 3764/// (2) avoids this but is very fiddly and phase-dependent. 3765void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3766 if (Shadow->getDeclName().getNameKind() == 3767 DeclarationName::CXXConversionFunctionName) 3768 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3769 3770 // Remove it from the DeclContext... 3771 Shadow->getDeclContext()->removeDecl(Shadow); 3772 3773 // ...and the scope, if applicable... 3774 if (S) { 3775 S->RemoveDecl(Shadow); 3776 IdResolver.RemoveDecl(Shadow); 3777 } 3778 3779 // ...and the using decl. 3780 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3781 3782 // TODO: complain somehow if Shadow was used. It shouldn't 3783 // be possible for this to happen, because...? 3784} 3785 3786/// Builds a using declaration. 3787/// 3788/// \param IsInstantiation - Whether this call arises from an 3789/// instantiation of an unresolved using declaration. We treat 3790/// the lookup differently for these declarations. 3791NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3792 SourceLocation UsingLoc, 3793 CXXScopeSpec &SS, 3794 const DeclarationNameInfo &NameInfo, 3795 AttributeList *AttrList, 3796 bool IsInstantiation, 3797 bool IsTypeName, 3798 SourceLocation TypenameLoc) { 3799 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3800 SourceLocation IdentLoc = NameInfo.getLoc(); 3801 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3802 3803 // FIXME: We ignore attributes for now. 3804 delete AttrList; 3805 3806 if (SS.isEmpty()) { 3807 Diag(IdentLoc, diag::err_using_requires_qualname); 3808 return 0; 3809 } 3810 3811 // Do the redeclaration lookup in the current scope. 3812 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3813 ForRedeclaration); 3814 Previous.setHideTags(false); 3815 if (S) { 3816 LookupName(Previous, S); 3817 3818 // It is really dumb that we have to do this. 3819 LookupResult::Filter F = Previous.makeFilter(); 3820 while (F.hasNext()) { 3821 NamedDecl *D = F.next(); 3822 if (!isDeclInScope(D, CurContext, S)) 3823 F.erase(); 3824 } 3825 F.done(); 3826 } else { 3827 assert(IsInstantiation && "no scope in non-instantiation"); 3828 assert(CurContext->isRecord() && "scope not record in instantiation"); 3829 LookupQualifiedName(Previous, CurContext); 3830 } 3831 3832 NestedNameSpecifier *NNS = 3833 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3834 3835 // Check for invalid redeclarations. 3836 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3837 return 0; 3838 3839 // Check for bad qualifiers. 3840 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3841 return 0; 3842 3843 DeclContext *LookupContext = computeDeclContext(SS); 3844 NamedDecl *D; 3845 if (!LookupContext) { 3846 if (IsTypeName) { 3847 // FIXME: not all declaration name kinds are legal here 3848 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3849 UsingLoc, TypenameLoc, 3850 SS.getRange(), NNS, 3851 IdentLoc, NameInfo.getName()); 3852 } else { 3853 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3854 UsingLoc, SS.getRange(), 3855 NNS, NameInfo); 3856 } 3857 } else { 3858 D = UsingDecl::Create(Context, CurContext, 3859 SS.getRange(), UsingLoc, NNS, NameInfo, 3860 IsTypeName); 3861 } 3862 D->setAccess(AS); 3863 CurContext->addDecl(D); 3864 3865 if (!LookupContext) return D; 3866 UsingDecl *UD = cast<UsingDecl>(D); 3867 3868 if (RequireCompleteDeclContext(SS, LookupContext)) { 3869 UD->setInvalidDecl(); 3870 return UD; 3871 } 3872 3873 // Look up the target name. 3874 3875 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3876 3877 // Unlike most lookups, we don't always want to hide tag 3878 // declarations: tag names are visible through the using declaration 3879 // even if hidden by ordinary names, *except* in a dependent context 3880 // where it's important for the sanity of two-phase lookup. 3881 if (!IsInstantiation) 3882 R.setHideTags(false); 3883 3884 LookupQualifiedName(R, LookupContext); 3885 3886 if (R.empty()) { 3887 Diag(IdentLoc, diag::err_no_member) 3888 << NameInfo.getName() << LookupContext << SS.getRange(); 3889 UD->setInvalidDecl(); 3890 return UD; 3891 } 3892 3893 if (R.isAmbiguous()) { 3894 UD->setInvalidDecl(); 3895 return UD; 3896 } 3897 3898 if (IsTypeName) { 3899 // If we asked for a typename and got a non-type decl, error out. 3900 if (!R.getAsSingle<TypeDecl>()) { 3901 Diag(IdentLoc, diag::err_using_typename_non_type); 3902 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3903 Diag((*I)->getUnderlyingDecl()->getLocation(), 3904 diag::note_using_decl_target); 3905 UD->setInvalidDecl(); 3906 return UD; 3907 } 3908 } else { 3909 // If we asked for a non-typename and we got a type, error out, 3910 // but only if this is an instantiation of an unresolved using 3911 // decl. Otherwise just silently find the type name. 3912 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3913 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3914 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3915 UD->setInvalidDecl(); 3916 return UD; 3917 } 3918 } 3919 3920 // C++0x N2914 [namespace.udecl]p6: 3921 // A using-declaration shall not name a namespace. 3922 if (R.getAsSingle<NamespaceDecl>()) { 3923 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3924 << SS.getRange(); 3925 UD->setInvalidDecl(); 3926 return UD; 3927 } 3928 3929 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3930 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3931 BuildUsingShadowDecl(S, UD, *I); 3932 } 3933 3934 return UD; 3935} 3936 3937/// Checks that the given using declaration is not an invalid 3938/// redeclaration. Note that this is checking only for the using decl 3939/// itself, not for any ill-formedness among the UsingShadowDecls. 3940bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3941 bool isTypeName, 3942 const CXXScopeSpec &SS, 3943 SourceLocation NameLoc, 3944 const LookupResult &Prev) { 3945 // C++03 [namespace.udecl]p8: 3946 // C++0x [namespace.udecl]p10: 3947 // A using-declaration is a declaration and can therefore be used 3948 // repeatedly where (and only where) multiple declarations are 3949 // allowed. 3950 // 3951 // That's in non-member contexts. 3952 if (!CurContext->getRedeclContext()->isRecord()) 3953 return false; 3954 3955 NestedNameSpecifier *Qual 3956 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3957 3958 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3959 NamedDecl *D = *I; 3960 3961 bool DTypename; 3962 NestedNameSpecifier *DQual; 3963 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3964 DTypename = UD->isTypeName(); 3965 DQual = UD->getTargetNestedNameDecl(); 3966 } else if (UnresolvedUsingValueDecl *UD 3967 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3968 DTypename = false; 3969 DQual = UD->getTargetNestedNameSpecifier(); 3970 } else if (UnresolvedUsingTypenameDecl *UD 3971 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3972 DTypename = true; 3973 DQual = UD->getTargetNestedNameSpecifier(); 3974 } else continue; 3975 3976 // using decls differ if one says 'typename' and the other doesn't. 3977 // FIXME: non-dependent using decls? 3978 if (isTypeName != DTypename) continue; 3979 3980 // using decls differ if they name different scopes (but note that 3981 // template instantiation can cause this check to trigger when it 3982 // didn't before instantiation). 3983 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3984 Context.getCanonicalNestedNameSpecifier(DQual)) 3985 continue; 3986 3987 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3988 Diag(D->getLocation(), diag::note_using_decl) << 1; 3989 return true; 3990 } 3991 3992 return false; 3993} 3994 3995 3996/// Checks that the given nested-name qualifier used in a using decl 3997/// in the current context is appropriately related to the current 3998/// scope. If an error is found, diagnoses it and returns true. 3999bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4000 const CXXScopeSpec &SS, 4001 SourceLocation NameLoc) { 4002 DeclContext *NamedContext = computeDeclContext(SS); 4003 4004 if (!CurContext->isRecord()) { 4005 // C++03 [namespace.udecl]p3: 4006 // C++0x [namespace.udecl]p8: 4007 // A using-declaration for a class member shall be a member-declaration. 4008 4009 // If we weren't able to compute a valid scope, it must be a 4010 // dependent class scope. 4011 if (!NamedContext || NamedContext->isRecord()) { 4012 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4013 << SS.getRange(); 4014 return true; 4015 } 4016 4017 // Otherwise, everything is known to be fine. 4018 return false; 4019 } 4020 4021 // The current scope is a record. 4022 4023 // If the named context is dependent, we can't decide much. 4024 if (!NamedContext) { 4025 // FIXME: in C++0x, we can diagnose if we can prove that the 4026 // nested-name-specifier does not refer to a base class, which is 4027 // still possible in some cases. 4028 4029 // Otherwise we have to conservatively report that things might be 4030 // okay. 4031 return false; 4032 } 4033 4034 if (!NamedContext->isRecord()) { 4035 // Ideally this would point at the last name in the specifier, 4036 // but we don't have that level of source info. 4037 Diag(SS.getRange().getBegin(), 4038 diag::err_using_decl_nested_name_specifier_is_not_class) 4039 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4040 return true; 4041 } 4042 4043 if (getLangOptions().CPlusPlus0x) { 4044 // C++0x [namespace.udecl]p3: 4045 // In a using-declaration used as a member-declaration, the 4046 // nested-name-specifier shall name a base class of the class 4047 // being defined. 4048 4049 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4050 cast<CXXRecordDecl>(NamedContext))) { 4051 if (CurContext == NamedContext) { 4052 Diag(NameLoc, 4053 diag::err_using_decl_nested_name_specifier_is_current_class) 4054 << SS.getRange(); 4055 return true; 4056 } 4057 4058 Diag(SS.getRange().getBegin(), 4059 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4060 << (NestedNameSpecifier*) SS.getScopeRep() 4061 << cast<CXXRecordDecl>(CurContext) 4062 << SS.getRange(); 4063 return true; 4064 } 4065 4066 return false; 4067 } 4068 4069 // C++03 [namespace.udecl]p4: 4070 // A using-declaration used as a member-declaration shall refer 4071 // to a member of a base class of the class being defined [etc.]. 4072 4073 // Salient point: SS doesn't have to name a base class as long as 4074 // lookup only finds members from base classes. Therefore we can 4075 // diagnose here only if we can prove that that can't happen, 4076 // i.e. if the class hierarchies provably don't intersect. 4077 4078 // TODO: it would be nice if "definitely valid" results were cached 4079 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4080 // need to be repeated. 4081 4082 struct UserData { 4083 llvm::DenseSet<const CXXRecordDecl*> Bases; 4084 4085 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4086 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4087 Data->Bases.insert(Base); 4088 return true; 4089 } 4090 4091 bool hasDependentBases(const CXXRecordDecl *Class) { 4092 return !Class->forallBases(collect, this); 4093 } 4094 4095 /// Returns true if the base is dependent or is one of the 4096 /// accumulated base classes. 4097 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4098 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4099 return !Data->Bases.count(Base); 4100 } 4101 4102 bool mightShareBases(const CXXRecordDecl *Class) { 4103 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4104 } 4105 }; 4106 4107 UserData Data; 4108 4109 // Returns false if we find a dependent base. 4110 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4111 return false; 4112 4113 // Returns false if the class has a dependent base or if it or one 4114 // of its bases is present in the base set of the current context. 4115 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4116 return false; 4117 4118 Diag(SS.getRange().getBegin(), 4119 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4120 << (NestedNameSpecifier*) SS.getScopeRep() 4121 << cast<CXXRecordDecl>(CurContext) 4122 << SS.getRange(); 4123 4124 return true; 4125} 4126 4127Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4128 SourceLocation NamespaceLoc, 4129 SourceLocation AliasLoc, 4130 IdentifierInfo *Alias, 4131 CXXScopeSpec &SS, 4132 SourceLocation IdentLoc, 4133 IdentifierInfo *Ident) { 4134 4135 // Lookup the namespace name. 4136 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4137 LookupParsedName(R, S, &SS); 4138 4139 // Check if we have a previous declaration with the same name. 4140 NamedDecl *PrevDecl 4141 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4142 ForRedeclaration); 4143 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4144 PrevDecl = 0; 4145 4146 if (PrevDecl) { 4147 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4148 // We already have an alias with the same name that points to the same 4149 // namespace, so don't create a new one. 4150 // FIXME: At some point, we'll want to create the (redundant) 4151 // declaration to maintain better source information. 4152 if (!R.isAmbiguous() && !R.empty() && 4153 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4154 return 0; 4155 } 4156 4157 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4158 diag::err_redefinition_different_kind; 4159 Diag(AliasLoc, DiagID) << Alias; 4160 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4161 return 0; 4162 } 4163 4164 if (R.isAmbiguous()) 4165 return 0; 4166 4167 if (R.empty()) { 4168 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4169 CTC_NoKeywords, 0)) { 4170 if (R.getAsSingle<NamespaceDecl>() || 4171 R.getAsSingle<NamespaceAliasDecl>()) { 4172 if (DeclContext *DC = computeDeclContext(SS, false)) 4173 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4174 << Ident << DC << Corrected << SS.getRange() 4175 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4176 else 4177 Diag(IdentLoc, diag::err_using_directive_suggest) 4178 << Ident << Corrected 4179 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4180 4181 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4182 << Corrected; 4183 4184 Ident = Corrected.getAsIdentifierInfo(); 4185 } else { 4186 R.clear(); 4187 R.setLookupName(Ident); 4188 } 4189 } 4190 4191 if (R.empty()) { 4192 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4193 return 0; 4194 } 4195 } 4196 4197 NamespaceAliasDecl *AliasDecl = 4198 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4199 Alias, SS.getRange(), 4200 (NestedNameSpecifier *)SS.getScopeRep(), 4201 IdentLoc, R.getFoundDecl()); 4202 4203 PushOnScopeChains(AliasDecl, S); 4204 return AliasDecl; 4205} 4206 4207namespace { 4208 /// \brief Scoped object used to handle the state changes required in Sema 4209 /// to implicitly define the body of a C++ member function; 4210 class ImplicitlyDefinedFunctionScope { 4211 Sema &S; 4212 DeclContext *PreviousContext; 4213 4214 public: 4215 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4216 : S(S), PreviousContext(S.CurContext) 4217 { 4218 S.CurContext = Method; 4219 S.PushFunctionScope(); 4220 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4221 } 4222 4223 ~ImplicitlyDefinedFunctionScope() { 4224 S.PopExpressionEvaluationContext(); 4225 S.PopFunctionOrBlockScope(); 4226 S.CurContext = PreviousContext; 4227 } 4228 }; 4229} 4230 4231static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4232 CXXRecordDecl *D) { 4233 ASTContext &Context = Self.Context; 4234 QualType ClassType = Context.getTypeDeclType(D); 4235 DeclarationName ConstructorName 4236 = Context.DeclarationNames.getCXXConstructorName( 4237 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4238 4239 DeclContext::lookup_const_iterator Con, ConEnd; 4240 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4241 Con != ConEnd; ++Con) { 4242 // FIXME: In C++0x, a constructor template can be a default constructor. 4243 if (isa<FunctionTemplateDecl>(*Con)) 4244 continue; 4245 4246 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4247 if (Constructor->isDefaultConstructor()) 4248 return Constructor; 4249 } 4250 return 0; 4251} 4252 4253CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4254 CXXRecordDecl *ClassDecl) { 4255 // C++ [class.ctor]p5: 4256 // A default constructor for a class X is a constructor of class X 4257 // that can be called without an argument. If there is no 4258 // user-declared constructor for class X, a default constructor is 4259 // implicitly declared. An implicitly-declared default constructor 4260 // is an inline public member of its class. 4261 assert(!ClassDecl->hasUserDeclaredConstructor() && 4262 "Should not build implicit default constructor!"); 4263 4264 // C++ [except.spec]p14: 4265 // An implicitly declared special member function (Clause 12) shall have an 4266 // exception-specification. [...] 4267 ImplicitExceptionSpecification ExceptSpec(Context); 4268 4269 // Direct base-class destructors. 4270 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4271 BEnd = ClassDecl->bases_end(); 4272 B != BEnd; ++B) { 4273 if (B->isVirtual()) // Handled below. 4274 continue; 4275 4276 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4277 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4278 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4279 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4280 else if (CXXConstructorDecl *Constructor 4281 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4282 ExceptSpec.CalledDecl(Constructor); 4283 } 4284 } 4285 4286 // Virtual base-class destructors. 4287 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4288 BEnd = ClassDecl->vbases_end(); 4289 B != BEnd; ++B) { 4290 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4291 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4292 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4293 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4294 else if (CXXConstructorDecl *Constructor 4295 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4296 ExceptSpec.CalledDecl(Constructor); 4297 } 4298 } 4299 4300 // Field destructors. 4301 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4302 FEnd = ClassDecl->field_end(); 4303 F != FEnd; ++F) { 4304 if (const RecordType *RecordTy 4305 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4306 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4307 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4308 ExceptSpec.CalledDecl( 4309 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4310 else if (CXXConstructorDecl *Constructor 4311 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4312 ExceptSpec.CalledDecl(Constructor); 4313 } 4314 } 4315 4316 4317 // Create the actual constructor declaration. 4318 CanQualType ClassType 4319 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4320 DeclarationName Name 4321 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4322 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4323 CXXConstructorDecl *DefaultCon 4324 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4325 Context.getFunctionType(Context.VoidTy, 4326 0, 0, false, 0, 4327 ExceptSpec.hasExceptionSpecification(), 4328 ExceptSpec.hasAnyExceptionSpecification(), 4329 ExceptSpec.size(), 4330 ExceptSpec.data(), 4331 FunctionType::ExtInfo()), 4332 /*TInfo=*/0, 4333 /*isExplicit=*/false, 4334 /*isInline=*/true, 4335 /*isImplicitlyDeclared=*/true); 4336 DefaultCon->setAccess(AS_public); 4337 DefaultCon->setImplicit(); 4338 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4339 4340 // Note that we have declared this constructor. 4341 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4342 4343 if (Scope *S = getScopeForContext(ClassDecl)) 4344 PushOnScopeChains(DefaultCon, S, false); 4345 ClassDecl->addDecl(DefaultCon); 4346 4347 return DefaultCon; 4348} 4349 4350void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4351 CXXConstructorDecl *Constructor) { 4352 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4353 !Constructor->isUsed(false)) && 4354 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4355 4356 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4357 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4358 4359 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4360 ErrorTrap Trap(*this); 4361 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4362 Trap.hasErrorOccurred()) { 4363 Diag(CurrentLocation, diag::note_member_synthesized_at) 4364 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4365 Constructor->setInvalidDecl(); 4366 return; 4367 } 4368 4369 SourceLocation Loc = Constructor->getLocation(); 4370 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4371 4372 Constructor->setUsed(); 4373 MarkVTableUsed(CurrentLocation, ClassDecl); 4374} 4375 4376CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4377 // C++ [class.dtor]p2: 4378 // If a class has no user-declared destructor, a destructor is 4379 // declared implicitly. An implicitly-declared destructor is an 4380 // inline public member of its class. 4381 4382 // C++ [except.spec]p14: 4383 // An implicitly declared special member function (Clause 12) shall have 4384 // an exception-specification. 4385 ImplicitExceptionSpecification ExceptSpec(Context); 4386 4387 // Direct base-class destructors. 4388 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4389 BEnd = ClassDecl->bases_end(); 4390 B != BEnd; ++B) { 4391 if (B->isVirtual()) // Handled below. 4392 continue; 4393 4394 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4395 ExceptSpec.CalledDecl( 4396 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4397 } 4398 4399 // Virtual base-class destructors. 4400 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4401 BEnd = ClassDecl->vbases_end(); 4402 B != BEnd; ++B) { 4403 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4404 ExceptSpec.CalledDecl( 4405 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4406 } 4407 4408 // Field destructors. 4409 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4410 FEnd = ClassDecl->field_end(); 4411 F != FEnd; ++F) { 4412 if (const RecordType *RecordTy 4413 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4414 ExceptSpec.CalledDecl( 4415 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4416 } 4417 4418 // Create the actual destructor declaration. 4419 QualType Ty = Context.getFunctionType(Context.VoidTy, 4420 0, 0, false, 0, 4421 ExceptSpec.hasExceptionSpecification(), 4422 ExceptSpec.hasAnyExceptionSpecification(), 4423 ExceptSpec.size(), 4424 ExceptSpec.data(), 4425 FunctionType::ExtInfo()); 4426 4427 CanQualType ClassType 4428 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4429 DeclarationName Name 4430 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4431 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4432 CXXDestructorDecl *Destructor 4433 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4434 /*isInline=*/true, 4435 /*isImplicitlyDeclared=*/true); 4436 Destructor->setAccess(AS_public); 4437 Destructor->setImplicit(); 4438 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4439 4440 // Note that we have declared this destructor. 4441 ++ASTContext::NumImplicitDestructorsDeclared; 4442 4443 // Introduce this destructor into its scope. 4444 if (Scope *S = getScopeForContext(ClassDecl)) 4445 PushOnScopeChains(Destructor, S, false); 4446 ClassDecl->addDecl(Destructor); 4447 4448 // This could be uniqued if it ever proves significant. 4449 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4450 4451 AddOverriddenMethods(ClassDecl, Destructor); 4452 4453 return Destructor; 4454} 4455 4456void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4457 CXXDestructorDecl *Destructor) { 4458 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4459 "DefineImplicitDestructor - call it for implicit default dtor"); 4460 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4461 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4462 4463 if (Destructor->isInvalidDecl()) 4464 return; 4465 4466 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4467 4468 ErrorTrap Trap(*this); 4469 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4470 Destructor->getParent()); 4471 4472 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4473 Diag(CurrentLocation, diag::note_member_synthesized_at) 4474 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4475 4476 Destructor->setInvalidDecl(); 4477 return; 4478 } 4479 4480 SourceLocation Loc = Destructor->getLocation(); 4481 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4482 4483 Destructor->setUsed(); 4484 MarkVTableUsed(CurrentLocation, ClassDecl); 4485} 4486 4487/// \brief Builds a statement that copies the given entity from \p From to 4488/// \c To. 4489/// 4490/// This routine is used to copy the members of a class with an 4491/// implicitly-declared copy assignment operator. When the entities being 4492/// copied are arrays, this routine builds for loops to copy them. 4493/// 4494/// \param S The Sema object used for type-checking. 4495/// 4496/// \param Loc The location where the implicit copy is being generated. 4497/// 4498/// \param T The type of the expressions being copied. Both expressions must 4499/// have this type. 4500/// 4501/// \param To The expression we are copying to. 4502/// 4503/// \param From The expression we are copying from. 4504/// 4505/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4506/// Otherwise, it's a non-static member subobject. 4507/// 4508/// \param Depth Internal parameter recording the depth of the recursion. 4509/// 4510/// \returns A statement or a loop that copies the expressions. 4511static StmtResult 4512BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4513 Expr *To, Expr *From, 4514 bool CopyingBaseSubobject, unsigned Depth = 0) { 4515 // C++0x [class.copy]p30: 4516 // Each subobject is assigned in the manner appropriate to its type: 4517 // 4518 // - if the subobject is of class type, the copy assignment operator 4519 // for the class is used (as if by explicit qualification; that is, 4520 // ignoring any possible virtual overriding functions in more derived 4521 // classes); 4522 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4523 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4524 4525 // Look for operator=. 4526 DeclarationName Name 4527 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4528 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4529 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4530 4531 // Filter out any result that isn't a copy-assignment operator. 4532 LookupResult::Filter F = OpLookup.makeFilter(); 4533 while (F.hasNext()) { 4534 NamedDecl *D = F.next(); 4535 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4536 if (Method->isCopyAssignmentOperator()) 4537 continue; 4538 4539 F.erase(); 4540 } 4541 F.done(); 4542 4543 // Suppress the protected check (C++ [class.protected]) for each of the 4544 // assignment operators we found. This strange dance is required when 4545 // we're assigning via a base classes's copy-assignment operator. To 4546 // ensure that we're getting the right base class subobject (without 4547 // ambiguities), we need to cast "this" to that subobject type; to 4548 // ensure that we don't go through the virtual call mechanism, we need 4549 // to qualify the operator= name with the base class (see below). However, 4550 // this means that if the base class has a protected copy assignment 4551 // operator, the protected member access check will fail. So, we 4552 // rewrite "protected" access to "public" access in this case, since we 4553 // know by construction that we're calling from a derived class. 4554 if (CopyingBaseSubobject) { 4555 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4556 L != LEnd; ++L) { 4557 if (L.getAccess() == AS_protected) 4558 L.setAccess(AS_public); 4559 } 4560 } 4561 4562 // Create the nested-name-specifier that will be used to qualify the 4563 // reference to operator=; this is required to suppress the virtual 4564 // call mechanism. 4565 CXXScopeSpec SS; 4566 SS.setRange(Loc); 4567 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4568 T.getTypePtr())); 4569 4570 // Create the reference to operator=. 4571 ExprResult OpEqualRef 4572 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4573 /*FirstQualifierInScope=*/0, OpLookup, 4574 /*TemplateArgs=*/0, 4575 /*SuppressQualifierCheck=*/true); 4576 if (OpEqualRef.isInvalid()) 4577 return StmtError(); 4578 4579 // Build the call to the assignment operator. 4580 4581 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4582 OpEqualRef.takeAs<Expr>(), 4583 Loc, &From, 1, Loc); 4584 if (Call.isInvalid()) 4585 return StmtError(); 4586 4587 return S.Owned(Call.takeAs<Stmt>()); 4588 } 4589 4590 // - if the subobject is of scalar type, the built-in assignment 4591 // operator is used. 4592 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4593 if (!ArrayTy) { 4594 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4595 if (Assignment.isInvalid()) 4596 return StmtError(); 4597 4598 return S.Owned(Assignment.takeAs<Stmt>()); 4599 } 4600 4601 // - if the subobject is an array, each element is assigned, in the 4602 // manner appropriate to the element type; 4603 4604 // Construct a loop over the array bounds, e.g., 4605 // 4606 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4607 // 4608 // that will copy each of the array elements. 4609 QualType SizeType = S.Context.getSizeType(); 4610 4611 // Create the iteration variable. 4612 IdentifierInfo *IterationVarName = 0; 4613 { 4614 llvm::SmallString<8> Str; 4615 llvm::raw_svector_ostream OS(Str); 4616 OS << "__i" << Depth; 4617 IterationVarName = &S.Context.Idents.get(OS.str()); 4618 } 4619 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4620 IterationVarName, SizeType, 4621 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4622 SC_None, SC_None); 4623 4624 // Initialize the iteration variable to zero. 4625 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4626 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4627 4628 // Create a reference to the iteration variable; we'll use this several 4629 // times throughout. 4630 Expr *IterationVarRef 4631 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4632 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4633 4634 // Create the DeclStmt that holds the iteration variable. 4635 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4636 4637 // Create the comparison against the array bound. 4638 llvm::APInt Upper = ArrayTy->getSize(); 4639 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4640 Expr *Comparison 4641 = new (S.Context) BinaryOperator(IterationVarRef, 4642 IntegerLiteral::Create(S.Context, 4643 Upper, SizeType, Loc), 4644 BO_NE, S.Context.BoolTy, Loc); 4645 4646 // Create the pre-increment of the iteration variable. 4647 Expr *Increment 4648 = new (S.Context) UnaryOperator(IterationVarRef, 4649 UO_PreInc, 4650 SizeType, Loc); 4651 4652 // Subscript the "from" and "to" expressions with the iteration variable. 4653 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4654 IterationVarRef, Loc)); 4655 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4656 IterationVarRef, Loc)); 4657 4658 // Build the copy for an individual element of the array. 4659 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4660 ArrayTy->getElementType(), 4661 To, From, 4662 CopyingBaseSubobject, Depth+1); 4663 if (Copy.isInvalid()) 4664 return StmtError(); 4665 4666 // Construct the loop that copies all elements of this array. 4667 return S.ActOnForStmt(Loc, Loc, InitStmt, 4668 S.MakeFullExpr(Comparison), 4669 0, S.MakeFullExpr(Increment), 4670 Loc, Copy.take()); 4671} 4672 4673/// \brief Determine whether the given class has a copy assignment operator 4674/// that accepts a const-qualified argument. 4675static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4676 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4677 4678 if (!Class->hasDeclaredCopyAssignment()) 4679 S.DeclareImplicitCopyAssignment(Class); 4680 4681 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4682 DeclarationName OpName 4683 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4684 4685 DeclContext::lookup_const_iterator Op, OpEnd; 4686 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4687 // C++ [class.copy]p9: 4688 // A user-declared copy assignment operator is a non-static non-template 4689 // member function of class X with exactly one parameter of type X, X&, 4690 // const X&, volatile X& or const volatile X&. 4691 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4692 if (!Method) 4693 continue; 4694 4695 if (Method->isStatic()) 4696 continue; 4697 if (Method->getPrimaryTemplate()) 4698 continue; 4699 const FunctionProtoType *FnType = 4700 Method->getType()->getAs<FunctionProtoType>(); 4701 assert(FnType && "Overloaded operator has no prototype."); 4702 // Don't assert on this; an invalid decl might have been left in the AST. 4703 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4704 continue; 4705 bool AcceptsConst = true; 4706 QualType ArgType = FnType->getArgType(0); 4707 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4708 ArgType = Ref->getPointeeType(); 4709 // Is it a non-const lvalue reference? 4710 if (!ArgType.isConstQualified()) 4711 AcceptsConst = false; 4712 } 4713 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4714 continue; 4715 4716 // We have a single argument of type cv X or cv X&, i.e. we've found the 4717 // copy assignment operator. Return whether it accepts const arguments. 4718 return AcceptsConst; 4719 } 4720 assert(Class->isInvalidDecl() && 4721 "No copy assignment operator declared in valid code."); 4722 return false; 4723} 4724 4725CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4726 // Note: The following rules are largely analoguous to the copy 4727 // constructor rules. Note that virtual bases are not taken into account 4728 // for determining the argument type of the operator. Note also that 4729 // operators taking an object instead of a reference are allowed. 4730 4731 4732 // C++ [class.copy]p10: 4733 // If the class definition does not explicitly declare a copy 4734 // assignment operator, one is declared implicitly. 4735 // The implicitly-defined copy assignment operator for a class X 4736 // will have the form 4737 // 4738 // X& X::operator=(const X&) 4739 // 4740 // if 4741 bool HasConstCopyAssignment = true; 4742 4743 // -- each direct base class B of X has a copy assignment operator 4744 // whose parameter is of type const B&, const volatile B& or B, 4745 // and 4746 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4747 BaseEnd = ClassDecl->bases_end(); 4748 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4749 assert(!Base->getType()->isDependentType() && 4750 "Cannot generate implicit members for class with dependent bases."); 4751 const CXXRecordDecl *BaseClassDecl 4752 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4753 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4754 } 4755 4756 // -- for all the nonstatic data members of X that are of a class 4757 // type M (or array thereof), each such class type has a copy 4758 // assignment operator whose parameter is of type const M&, 4759 // const volatile M& or M. 4760 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4761 FieldEnd = ClassDecl->field_end(); 4762 HasConstCopyAssignment && Field != FieldEnd; 4763 ++Field) { 4764 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4765 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4766 const CXXRecordDecl *FieldClassDecl 4767 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4768 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4769 } 4770 } 4771 4772 // Otherwise, the implicitly declared copy assignment operator will 4773 // have the form 4774 // 4775 // X& X::operator=(X&) 4776 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4777 QualType RetType = Context.getLValueReferenceType(ArgType); 4778 if (HasConstCopyAssignment) 4779 ArgType = ArgType.withConst(); 4780 ArgType = Context.getLValueReferenceType(ArgType); 4781 4782 // C++ [except.spec]p14: 4783 // An implicitly declared special member function (Clause 12) shall have an 4784 // exception-specification. [...] 4785 ImplicitExceptionSpecification ExceptSpec(Context); 4786 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4787 BaseEnd = ClassDecl->bases_end(); 4788 Base != BaseEnd; ++Base) { 4789 CXXRecordDecl *BaseClassDecl 4790 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4791 4792 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4793 DeclareImplicitCopyAssignment(BaseClassDecl); 4794 4795 if (CXXMethodDecl *CopyAssign 4796 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4797 ExceptSpec.CalledDecl(CopyAssign); 4798 } 4799 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4800 FieldEnd = ClassDecl->field_end(); 4801 Field != FieldEnd; 4802 ++Field) { 4803 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4804 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4805 CXXRecordDecl *FieldClassDecl 4806 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4807 4808 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4809 DeclareImplicitCopyAssignment(FieldClassDecl); 4810 4811 if (CXXMethodDecl *CopyAssign 4812 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4813 ExceptSpec.CalledDecl(CopyAssign); 4814 } 4815 } 4816 4817 // An implicitly-declared copy assignment operator is an inline public 4818 // member of its class. 4819 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4820 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4821 CXXMethodDecl *CopyAssignment 4822 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4823 Context.getFunctionType(RetType, &ArgType, 1, 4824 false, 0, 4825 ExceptSpec.hasExceptionSpecification(), 4826 ExceptSpec.hasAnyExceptionSpecification(), 4827 ExceptSpec.size(), 4828 ExceptSpec.data(), 4829 FunctionType::ExtInfo()), 4830 /*TInfo=*/0, /*isStatic=*/false, 4831 /*StorageClassAsWritten=*/SC_None, 4832 /*isInline=*/true); 4833 CopyAssignment->setAccess(AS_public); 4834 CopyAssignment->setImplicit(); 4835 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4836 4837 // Add the parameter to the operator. 4838 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4839 ClassDecl->getLocation(), 4840 /*Id=*/0, 4841 ArgType, /*TInfo=*/0, 4842 SC_None, 4843 SC_None, 0); 4844 CopyAssignment->setParams(&FromParam, 1); 4845 4846 // Note that we have added this copy-assignment operator. 4847 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4848 4849 if (Scope *S = getScopeForContext(ClassDecl)) 4850 PushOnScopeChains(CopyAssignment, S, false); 4851 ClassDecl->addDecl(CopyAssignment); 4852 4853 AddOverriddenMethods(ClassDecl, CopyAssignment); 4854 return CopyAssignment; 4855} 4856 4857void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4858 CXXMethodDecl *CopyAssignOperator) { 4859 assert((CopyAssignOperator->isImplicit() && 4860 CopyAssignOperator->isOverloadedOperator() && 4861 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4862 !CopyAssignOperator->isUsed(false)) && 4863 "DefineImplicitCopyAssignment called for wrong function"); 4864 4865 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4866 4867 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4868 CopyAssignOperator->setInvalidDecl(); 4869 return; 4870 } 4871 4872 CopyAssignOperator->setUsed(); 4873 4874 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4875 ErrorTrap Trap(*this); 4876 4877 // C++0x [class.copy]p30: 4878 // The implicitly-defined or explicitly-defaulted copy assignment operator 4879 // for a non-union class X performs memberwise copy assignment of its 4880 // subobjects. The direct base classes of X are assigned first, in the 4881 // order of their declaration in the base-specifier-list, and then the 4882 // immediate non-static data members of X are assigned, in the order in 4883 // which they were declared in the class definition. 4884 4885 // The statements that form the synthesized function body. 4886 ASTOwningVector<Stmt*> Statements(*this); 4887 4888 // The parameter for the "other" object, which we are copying from. 4889 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4890 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4891 QualType OtherRefType = Other->getType(); 4892 if (const LValueReferenceType *OtherRef 4893 = OtherRefType->getAs<LValueReferenceType>()) { 4894 OtherRefType = OtherRef->getPointeeType(); 4895 OtherQuals = OtherRefType.getQualifiers(); 4896 } 4897 4898 // Our location for everything implicitly-generated. 4899 SourceLocation Loc = CopyAssignOperator->getLocation(); 4900 4901 // Construct a reference to the "other" object. We'll be using this 4902 // throughout the generated ASTs. 4903 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4904 assert(OtherRef && "Reference to parameter cannot fail!"); 4905 4906 // Construct the "this" pointer. We'll be using this throughout the generated 4907 // ASTs. 4908 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4909 assert(This && "Reference to this cannot fail!"); 4910 4911 // Assign base classes. 4912 bool Invalid = false; 4913 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4914 E = ClassDecl->bases_end(); Base != E; ++Base) { 4915 // Form the assignment: 4916 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4917 QualType BaseType = Base->getType().getUnqualifiedType(); 4918 CXXRecordDecl *BaseClassDecl = 0; 4919 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4920 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4921 else { 4922 Invalid = true; 4923 continue; 4924 } 4925 4926 CXXCastPath BasePath; 4927 BasePath.push_back(Base); 4928 4929 // Construct the "from" expression, which is an implicit cast to the 4930 // appropriately-qualified base type. 4931 Expr *From = OtherRef; 4932 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4933 CK_UncheckedDerivedToBase, 4934 VK_LValue, &BasePath); 4935 4936 // Dereference "this". 4937 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4938 4939 // Implicitly cast "this" to the appropriately-qualified base type. 4940 Expr *ToE = To.takeAs<Expr>(); 4941 ImpCastExprToType(ToE, 4942 Context.getCVRQualifiedType(BaseType, 4943 CopyAssignOperator->getTypeQualifiers()), 4944 CK_UncheckedDerivedToBase, 4945 VK_LValue, &BasePath); 4946 To = Owned(ToE); 4947 4948 // Build the copy. 4949 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4950 To.get(), From, 4951 /*CopyingBaseSubobject=*/true); 4952 if (Copy.isInvalid()) { 4953 Diag(CurrentLocation, diag::note_member_synthesized_at) 4954 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4955 CopyAssignOperator->setInvalidDecl(); 4956 return; 4957 } 4958 4959 // Success! Record the copy. 4960 Statements.push_back(Copy.takeAs<Expr>()); 4961 } 4962 4963 // \brief Reference to the __builtin_memcpy function. 4964 Expr *BuiltinMemCpyRef = 0; 4965 // \brief Reference to the __builtin_objc_memmove_collectable function. 4966 Expr *CollectableMemCpyRef = 0; 4967 4968 // Assign non-static members. 4969 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4970 FieldEnd = ClassDecl->field_end(); 4971 Field != FieldEnd; ++Field) { 4972 // Check for members of reference type; we can't copy those. 4973 if (Field->getType()->isReferenceType()) { 4974 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4975 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4976 Diag(Field->getLocation(), diag::note_declared_at); 4977 Diag(CurrentLocation, diag::note_member_synthesized_at) 4978 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4979 Invalid = true; 4980 continue; 4981 } 4982 4983 // Check for members of const-qualified, non-class type. 4984 QualType BaseType = Context.getBaseElementType(Field->getType()); 4985 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4986 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4987 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4988 Diag(Field->getLocation(), diag::note_declared_at); 4989 Diag(CurrentLocation, diag::note_member_synthesized_at) 4990 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4991 Invalid = true; 4992 continue; 4993 } 4994 4995 QualType FieldType = Field->getType().getNonReferenceType(); 4996 if (FieldType->isIncompleteArrayType()) { 4997 assert(ClassDecl->hasFlexibleArrayMember() && 4998 "Incomplete array type is not valid"); 4999 continue; 5000 } 5001 5002 // Build references to the field in the object we're copying from and to. 5003 CXXScopeSpec SS; // Intentionally empty 5004 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5005 LookupMemberName); 5006 MemberLookup.addDecl(*Field); 5007 MemberLookup.resolveKind(); 5008 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5009 Loc, /*IsArrow=*/false, 5010 SS, 0, MemberLookup, 0); 5011 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5012 Loc, /*IsArrow=*/true, 5013 SS, 0, MemberLookup, 0); 5014 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5015 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5016 5017 // If the field should be copied with __builtin_memcpy rather than via 5018 // explicit assignments, do so. This optimization only applies for arrays 5019 // of scalars and arrays of class type with trivial copy-assignment 5020 // operators. 5021 if (FieldType->isArrayType() && 5022 (!BaseType->isRecordType() || 5023 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5024 ->hasTrivialCopyAssignment())) { 5025 // Compute the size of the memory buffer to be copied. 5026 QualType SizeType = Context.getSizeType(); 5027 llvm::APInt Size(Context.getTypeSize(SizeType), 5028 Context.getTypeSizeInChars(BaseType).getQuantity()); 5029 for (const ConstantArrayType *Array 5030 = Context.getAsConstantArrayType(FieldType); 5031 Array; 5032 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5033 llvm::APInt ArraySize = Array->getSize(); 5034 ArraySize.zextOrTrunc(Size.getBitWidth()); 5035 Size *= ArraySize; 5036 } 5037 5038 // Take the address of the field references for "from" and "to". 5039 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5040 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5041 5042 bool NeedsCollectableMemCpy = 5043 (BaseType->isRecordType() && 5044 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5045 5046 if (NeedsCollectableMemCpy) { 5047 if (!CollectableMemCpyRef) { 5048 // Create a reference to the __builtin_objc_memmove_collectable function. 5049 LookupResult R(*this, 5050 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5051 Loc, LookupOrdinaryName); 5052 LookupName(R, TUScope, true); 5053 5054 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5055 if (!CollectableMemCpy) { 5056 // Something went horribly wrong earlier, and we will have 5057 // complained about it. 5058 Invalid = true; 5059 continue; 5060 } 5061 5062 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5063 CollectableMemCpy->getType(), 5064 Loc, 0).takeAs<Expr>(); 5065 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5066 } 5067 } 5068 // Create a reference to the __builtin_memcpy builtin function. 5069 else if (!BuiltinMemCpyRef) { 5070 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5071 LookupOrdinaryName); 5072 LookupName(R, TUScope, true); 5073 5074 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5075 if (!BuiltinMemCpy) { 5076 // Something went horribly wrong earlier, and we will have complained 5077 // about it. 5078 Invalid = true; 5079 continue; 5080 } 5081 5082 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5083 BuiltinMemCpy->getType(), 5084 Loc, 0).takeAs<Expr>(); 5085 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5086 } 5087 5088 ASTOwningVector<Expr*> CallArgs(*this); 5089 CallArgs.push_back(To.takeAs<Expr>()); 5090 CallArgs.push_back(From.takeAs<Expr>()); 5091 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5092 ExprResult Call = ExprError(); 5093 if (NeedsCollectableMemCpy) 5094 Call = ActOnCallExpr(/*Scope=*/0, 5095 CollectableMemCpyRef, 5096 Loc, move_arg(CallArgs), 5097 Loc); 5098 else 5099 Call = ActOnCallExpr(/*Scope=*/0, 5100 BuiltinMemCpyRef, 5101 Loc, move_arg(CallArgs), 5102 Loc); 5103 5104 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5105 Statements.push_back(Call.takeAs<Expr>()); 5106 continue; 5107 } 5108 5109 // Build the copy of this field. 5110 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5111 To.get(), From.get(), 5112 /*CopyingBaseSubobject=*/false); 5113 if (Copy.isInvalid()) { 5114 Diag(CurrentLocation, diag::note_member_synthesized_at) 5115 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5116 CopyAssignOperator->setInvalidDecl(); 5117 return; 5118 } 5119 5120 // Success! Record the copy. 5121 Statements.push_back(Copy.takeAs<Stmt>()); 5122 } 5123 5124 if (!Invalid) { 5125 // Add a "return *this;" 5126 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5127 5128 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5129 if (Return.isInvalid()) 5130 Invalid = true; 5131 else { 5132 Statements.push_back(Return.takeAs<Stmt>()); 5133 5134 if (Trap.hasErrorOccurred()) { 5135 Diag(CurrentLocation, diag::note_member_synthesized_at) 5136 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5137 Invalid = true; 5138 } 5139 } 5140 } 5141 5142 if (Invalid) { 5143 CopyAssignOperator->setInvalidDecl(); 5144 return; 5145 } 5146 5147 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5148 /*isStmtExpr=*/false); 5149 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5150 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5151} 5152 5153CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5154 CXXRecordDecl *ClassDecl) { 5155 // C++ [class.copy]p4: 5156 // If the class definition does not explicitly declare a copy 5157 // constructor, one is declared implicitly. 5158 5159 // C++ [class.copy]p5: 5160 // The implicitly-declared copy constructor for a class X will 5161 // have the form 5162 // 5163 // X::X(const X&) 5164 // 5165 // if 5166 bool HasConstCopyConstructor = true; 5167 5168 // -- each direct or virtual base class B of X has a copy 5169 // constructor whose first parameter is of type const B& or 5170 // const volatile B&, and 5171 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5172 BaseEnd = ClassDecl->bases_end(); 5173 HasConstCopyConstructor && Base != BaseEnd; 5174 ++Base) { 5175 // Virtual bases are handled below. 5176 if (Base->isVirtual()) 5177 continue; 5178 5179 CXXRecordDecl *BaseClassDecl 5180 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5181 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5182 DeclareImplicitCopyConstructor(BaseClassDecl); 5183 5184 HasConstCopyConstructor 5185 = BaseClassDecl->hasConstCopyConstructor(Context); 5186 } 5187 5188 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5189 BaseEnd = ClassDecl->vbases_end(); 5190 HasConstCopyConstructor && Base != BaseEnd; 5191 ++Base) { 5192 CXXRecordDecl *BaseClassDecl 5193 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5194 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5195 DeclareImplicitCopyConstructor(BaseClassDecl); 5196 5197 HasConstCopyConstructor 5198 = BaseClassDecl->hasConstCopyConstructor(Context); 5199 } 5200 5201 // -- for all the nonstatic data members of X that are of a 5202 // class type M (or array thereof), each such class type 5203 // has a copy constructor whose first parameter is of type 5204 // const M& or const volatile M&. 5205 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5206 FieldEnd = ClassDecl->field_end(); 5207 HasConstCopyConstructor && Field != FieldEnd; 5208 ++Field) { 5209 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5210 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5211 CXXRecordDecl *FieldClassDecl 5212 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5213 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5214 DeclareImplicitCopyConstructor(FieldClassDecl); 5215 5216 HasConstCopyConstructor 5217 = FieldClassDecl->hasConstCopyConstructor(Context); 5218 } 5219 } 5220 5221 // Otherwise, the implicitly declared copy constructor will have 5222 // the form 5223 // 5224 // X::X(X&) 5225 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5226 QualType ArgType = ClassType; 5227 if (HasConstCopyConstructor) 5228 ArgType = ArgType.withConst(); 5229 ArgType = Context.getLValueReferenceType(ArgType); 5230 5231 // C++ [except.spec]p14: 5232 // An implicitly declared special member function (Clause 12) shall have an 5233 // exception-specification. [...] 5234 ImplicitExceptionSpecification ExceptSpec(Context); 5235 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5236 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5237 BaseEnd = ClassDecl->bases_end(); 5238 Base != BaseEnd; 5239 ++Base) { 5240 // Virtual bases are handled below. 5241 if (Base->isVirtual()) 5242 continue; 5243 5244 CXXRecordDecl *BaseClassDecl 5245 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5246 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5247 DeclareImplicitCopyConstructor(BaseClassDecl); 5248 5249 if (CXXConstructorDecl *CopyConstructor 5250 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5251 ExceptSpec.CalledDecl(CopyConstructor); 5252 } 5253 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5254 BaseEnd = ClassDecl->vbases_end(); 5255 Base != BaseEnd; 5256 ++Base) { 5257 CXXRecordDecl *BaseClassDecl 5258 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5259 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5260 DeclareImplicitCopyConstructor(BaseClassDecl); 5261 5262 if (CXXConstructorDecl *CopyConstructor 5263 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5264 ExceptSpec.CalledDecl(CopyConstructor); 5265 } 5266 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5267 FieldEnd = ClassDecl->field_end(); 5268 Field != FieldEnd; 5269 ++Field) { 5270 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5271 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5272 CXXRecordDecl *FieldClassDecl 5273 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5274 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5275 DeclareImplicitCopyConstructor(FieldClassDecl); 5276 5277 if (CXXConstructorDecl *CopyConstructor 5278 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5279 ExceptSpec.CalledDecl(CopyConstructor); 5280 } 5281 } 5282 5283 // An implicitly-declared copy constructor is an inline public 5284 // member of its class. 5285 DeclarationName Name 5286 = Context.DeclarationNames.getCXXConstructorName( 5287 Context.getCanonicalType(ClassType)); 5288 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5289 CXXConstructorDecl *CopyConstructor 5290 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5291 Context.getFunctionType(Context.VoidTy, 5292 &ArgType, 1, 5293 false, 0, 5294 ExceptSpec.hasExceptionSpecification(), 5295 ExceptSpec.hasAnyExceptionSpecification(), 5296 ExceptSpec.size(), 5297 ExceptSpec.data(), 5298 FunctionType::ExtInfo()), 5299 /*TInfo=*/0, 5300 /*isExplicit=*/false, 5301 /*isInline=*/true, 5302 /*isImplicitlyDeclared=*/true); 5303 CopyConstructor->setAccess(AS_public); 5304 CopyConstructor->setImplicit(); 5305 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5306 5307 // Note that we have declared this constructor. 5308 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5309 5310 // Add the parameter to the constructor. 5311 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5312 ClassDecl->getLocation(), 5313 /*IdentifierInfo=*/0, 5314 ArgType, /*TInfo=*/0, 5315 SC_None, 5316 SC_None, 0); 5317 CopyConstructor->setParams(&FromParam, 1); 5318 if (Scope *S = getScopeForContext(ClassDecl)) 5319 PushOnScopeChains(CopyConstructor, S, false); 5320 ClassDecl->addDecl(CopyConstructor); 5321 5322 return CopyConstructor; 5323} 5324 5325void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5326 CXXConstructorDecl *CopyConstructor, 5327 unsigned TypeQuals) { 5328 assert((CopyConstructor->isImplicit() && 5329 CopyConstructor->isCopyConstructor(TypeQuals) && 5330 !CopyConstructor->isUsed(false)) && 5331 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5332 5333 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5334 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5335 5336 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5337 ErrorTrap Trap(*this); 5338 5339 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5340 Trap.hasErrorOccurred()) { 5341 Diag(CurrentLocation, diag::note_member_synthesized_at) 5342 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5343 CopyConstructor->setInvalidDecl(); 5344 } else { 5345 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5346 CopyConstructor->getLocation(), 5347 MultiStmtArg(*this, 0, 0), 5348 /*isStmtExpr=*/false) 5349 .takeAs<Stmt>()); 5350 } 5351 5352 CopyConstructor->setUsed(); 5353} 5354 5355ExprResult 5356Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5357 CXXConstructorDecl *Constructor, 5358 MultiExprArg ExprArgs, 5359 bool RequiresZeroInit, 5360 unsigned ConstructKind, 5361 SourceRange ParenRange) { 5362 bool Elidable = false; 5363 5364 // C++0x [class.copy]p34: 5365 // When certain criteria are met, an implementation is allowed to 5366 // omit the copy/move construction of a class object, even if the 5367 // copy/move constructor and/or destructor for the object have 5368 // side effects. [...] 5369 // - when a temporary class object that has not been bound to a 5370 // reference (12.2) would be copied/moved to a class object 5371 // with the same cv-unqualified type, the copy/move operation 5372 // can be omitted by constructing the temporary object 5373 // directly into the target of the omitted copy/move 5374 if (ConstructKind == CXXConstructExpr::CK_Complete && 5375 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5376 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5377 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5378 } 5379 5380 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5381 Elidable, move(ExprArgs), RequiresZeroInit, 5382 ConstructKind, ParenRange); 5383} 5384 5385/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5386/// including handling of its default argument expressions. 5387ExprResult 5388Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5389 CXXConstructorDecl *Constructor, bool Elidable, 5390 MultiExprArg ExprArgs, 5391 bool RequiresZeroInit, 5392 unsigned ConstructKind, 5393 SourceRange ParenRange) { 5394 unsigned NumExprs = ExprArgs.size(); 5395 Expr **Exprs = (Expr **)ExprArgs.release(); 5396 5397 MarkDeclarationReferenced(ConstructLoc, Constructor); 5398 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5399 Constructor, Elidable, Exprs, NumExprs, 5400 RequiresZeroInit, 5401 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5402 ParenRange)); 5403} 5404 5405bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5406 CXXConstructorDecl *Constructor, 5407 MultiExprArg Exprs) { 5408 // FIXME: Provide the correct paren SourceRange when available. 5409 ExprResult TempResult = 5410 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5411 move(Exprs), false, CXXConstructExpr::CK_Complete, 5412 SourceRange()); 5413 if (TempResult.isInvalid()) 5414 return true; 5415 5416 Expr *Temp = TempResult.takeAs<Expr>(); 5417 CheckImplicitConversions(Temp, VD->getLocation()); 5418 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5419 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5420 VD->setInit(Temp); 5421 5422 return false; 5423} 5424 5425void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5426 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5427 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5428 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5429 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5430 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5431 CheckDestructorAccess(VD->getLocation(), Destructor, 5432 PDiag(diag::err_access_dtor_var) 5433 << VD->getDeclName() 5434 << VD->getType()); 5435 5436 // TODO: this should be re-enabled for static locals by !CXAAtExit 5437 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5438 Diag(VD->getLocation(), diag::warn_global_destructor); 5439 } 5440} 5441 5442/// AddCXXDirectInitializerToDecl - This action is called immediately after 5443/// ActOnDeclarator, when a C++ direct initializer is present. 5444/// e.g: "int x(1);" 5445void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5446 SourceLocation LParenLoc, 5447 MultiExprArg Exprs, 5448 SourceLocation RParenLoc) { 5449 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5450 5451 // If there is no declaration, there was an error parsing it. Just ignore 5452 // the initializer. 5453 if (RealDecl == 0) 5454 return; 5455 5456 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5457 if (!VDecl) { 5458 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5459 RealDecl->setInvalidDecl(); 5460 return; 5461 } 5462 5463 // We will represent direct-initialization similarly to copy-initialization: 5464 // int x(1); -as-> int x = 1; 5465 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5466 // 5467 // Clients that want to distinguish between the two forms, can check for 5468 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5469 // A major benefit is that clients that don't particularly care about which 5470 // exactly form was it (like the CodeGen) can handle both cases without 5471 // special case code. 5472 5473 // C++ 8.5p11: 5474 // The form of initialization (using parentheses or '=') is generally 5475 // insignificant, but does matter when the entity being initialized has a 5476 // class type. 5477 5478 if (!VDecl->getType()->isDependentType() && 5479 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5480 diag::err_typecheck_decl_incomplete_type)) { 5481 VDecl->setInvalidDecl(); 5482 return; 5483 } 5484 5485 // The variable can not have an abstract class type. 5486 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5487 diag::err_abstract_type_in_decl, 5488 AbstractVariableType)) 5489 VDecl->setInvalidDecl(); 5490 5491 const VarDecl *Def; 5492 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5493 Diag(VDecl->getLocation(), diag::err_redefinition) 5494 << VDecl->getDeclName(); 5495 Diag(Def->getLocation(), diag::note_previous_definition); 5496 VDecl->setInvalidDecl(); 5497 return; 5498 } 5499 5500 // C++ [class.static.data]p4 5501 // If a static data member is of const integral or const 5502 // enumeration type, its declaration in the class definition can 5503 // specify a constant-initializer which shall be an integral 5504 // constant expression (5.19). In that case, the member can appear 5505 // in integral constant expressions. The member shall still be 5506 // defined in a namespace scope if it is used in the program and the 5507 // namespace scope definition shall not contain an initializer. 5508 // 5509 // We already performed a redefinition check above, but for static 5510 // data members we also need to check whether there was an in-class 5511 // declaration with an initializer. 5512 const VarDecl* PrevInit = 0; 5513 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5514 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5515 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5516 return; 5517 } 5518 5519 // If either the declaration has a dependent type or if any of the 5520 // expressions is type-dependent, we represent the initialization 5521 // via a ParenListExpr for later use during template instantiation. 5522 if (VDecl->getType()->isDependentType() || 5523 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5524 // Let clients know that initialization was done with a direct initializer. 5525 VDecl->setCXXDirectInitializer(true); 5526 5527 // Store the initialization expressions as a ParenListExpr. 5528 unsigned NumExprs = Exprs.size(); 5529 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5530 (Expr **)Exprs.release(), 5531 NumExprs, RParenLoc)); 5532 return; 5533 } 5534 5535 // Capture the variable that is being initialized and the style of 5536 // initialization. 5537 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5538 5539 // FIXME: Poor source location information. 5540 InitializationKind Kind 5541 = InitializationKind::CreateDirect(VDecl->getLocation(), 5542 LParenLoc, RParenLoc); 5543 5544 InitializationSequence InitSeq(*this, Entity, Kind, 5545 Exprs.get(), Exprs.size()); 5546 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5547 if (Result.isInvalid()) { 5548 VDecl->setInvalidDecl(); 5549 return; 5550 } 5551 5552 CheckImplicitConversions(Result.get(), LParenLoc); 5553 5554 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5555 VDecl->setInit(Result.takeAs<Expr>()); 5556 VDecl->setCXXDirectInitializer(true); 5557 5558 if (!VDecl->isInvalidDecl() && 5559 !VDecl->getDeclContext()->isDependentContext() && 5560 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5561 !VDecl->getInit()->isConstantInitializer(Context, 5562 VDecl->getType()->isReferenceType())) 5563 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5564 << VDecl->getInit()->getSourceRange(); 5565 5566 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5567 FinalizeVarWithDestructor(VDecl, Record); 5568} 5569 5570/// \brief Given a constructor and the set of arguments provided for the 5571/// constructor, convert the arguments and add any required default arguments 5572/// to form a proper call to this constructor. 5573/// 5574/// \returns true if an error occurred, false otherwise. 5575bool 5576Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5577 MultiExprArg ArgsPtr, 5578 SourceLocation Loc, 5579 ASTOwningVector<Expr*> &ConvertedArgs) { 5580 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5581 unsigned NumArgs = ArgsPtr.size(); 5582 Expr **Args = (Expr **)ArgsPtr.get(); 5583 5584 const FunctionProtoType *Proto 5585 = Constructor->getType()->getAs<FunctionProtoType>(); 5586 assert(Proto && "Constructor without a prototype?"); 5587 unsigned NumArgsInProto = Proto->getNumArgs(); 5588 5589 // If too few arguments are available, we'll fill in the rest with defaults. 5590 if (NumArgs < NumArgsInProto) 5591 ConvertedArgs.reserve(NumArgsInProto); 5592 else 5593 ConvertedArgs.reserve(NumArgs); 5594 5595 VariadicCallType CallType = 5596 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5597 llvm::SmallVector<Expr *, 8> AllArgs; 5598 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5599 Proto, 0, Args, NumArgs, AllArgs, 5600 CallType); 5601 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5602 ConvertedArgs.push_back(AllArgs[i]); 5603 return Invalid; 5604} 5605 5606static inline bool 5607CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5608 const FunctionDecl *FnDecl) { 5609 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5610 if (isa<NamespaceDecl>(DC)) { 5611 return SemaRef.Diag(FnDecl->getLocation(), 5612 diag::err_operator_new_delete_declared_in_namespace) 5613 << FnDecl->getDeclName(); 5614 } 5615 5616 if (isa<TranslationUnitDecl>(DC) && 5617 FnDecl->getStorageClass() == SC_Static) { 5618 return SemaRef.Diag(FnDecl->getLocation(), 5619 diag::err_operator_new_delete_declared_static) 5620 << FnDecl->getDeclName(); 5621 } 5622 5623 return false; 5624} 5625 5626static inline bool 5627CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5628 CanQualType ExpectedResultType, 5629 CanQualType ExpectedFirstParamType, 5630 unsigned DependentParamTypeDiag, 5631 unsigned InvalidParamTypeDiag) { 5632 QualType ResultType = 5633 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5634 5635 // Check that the result type is not dependent. 5636 if (ResultType->isDependentType()) 5637 return SemaRef.Diag(FnDecl->getLocation(), 5638 diag::err_operator_new_delete_dependent_result_type) 5639 << FnDecl->getDeclName() << ExpectedResultType; 5640 5641 // Check that the result type is what we expect. 5642 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5643 return SemaRef.Diag(FnDecl->getLocation(), 5644 diag::err_operator_new_delete_invalid_result_type) 5645 << FnDecl->getDeclName() << ExpectedResultType; 5646 5647 // A function template must have at least 2 parameters. 5648 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5649 return SemaRef.Diag(FnDecl->getLocation(), 5650 diag::err_operator_new_delete_template_too_few_parameters) 5651 << FnDecl->getDeclName(); 5652 5653 // The function decl must have at least 1 parameter. 5654 if (FnDecl->getNumParams() == 0) 5655 return SemaRef.Diag(FnDecl->getLocation(), 5656 diag::err_operator_new_delete_too_few_parameters) 5657 << FnDecl->getDeclName(); 5658 5659 // Check the the first parameter type is not dependent. 5660 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5661 if (FirstParamType->isDependentType()) 5662 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5663 << FnDecl->getDeclName() << ExpectedFirstParamType; 5664 5665 // Check that the first parameter type is what we expect. 5666 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5667 ExpectedFirstParamType) 5668 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5669 << FnDecl->getDeclName() << ExpectedFirstParamType; 5670 5671 return false; 5672} 5673 5674static bool 5675CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5676 // C++ [basic.stc.dynamic.allocation]p1: 5677 // A program is ill-formed if an allocation function is declared in a 5678 // namespace scope other than global scope or declared static in global 5679 // scope. 5680 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5681 return true; 5682 5683 CanQualType SizeTy = 5684 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5685 5686 // C++ [basic.stc.dynamic.allocation]p1: 5687 // The return type shall be void*. The first parameter shall have type 5688 // std::size_t. 5689 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5690 SizeTy, 5691 diag::err_operator_new_dependent_param_type, 5692 diag::err_operator_new_param_type)) 5693 return true; 5694 5695 // C++ [basic.stc.dynamic.allocation]p1: 5696 // The first parameter shall not have an associated default argument. 5697 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5698 return SemaRef.Diag(FnDecl->getLocation(), 5699 diag::err_operator_new_default_arg) 5700 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5701 5702 return false; 5703} 5704 5705static bool 5706CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5707 // C++ [basic.stc.dynamic.deallocation]p1: 5708 // A program is ill-formed if deallocation functions are declared in a 5709 // namespace scope other than global scope or declared static in global 5710 // scope. 5711 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5712 return true; 5713 5714 // C++ [basic.stc.dynamic.deallocation]p2: 5715 // Each deallocation function shall return void and its first parameter 5716 // shall be void*. 5717 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5718 SemaRef.Context.VoidPtrTy, 5719 diag::err_operator_delete_dependent_param_type, 5720 diag::err_operator_delete_param_type)) 5721 return true; 5722 5723 return false; 5724} 5725 5726/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5727/// of this overloaded operator is well-formed. If so, returns false; 5728/// otherwise, emits appropriate diagnostics and returns true. 5729bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5730 assert(FnDecl && FnDecl->isOverloadedOperator() && 5731 "Expected an overloaded operator declaration"); 5732 5733 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5734 5735 // C++ [over.oper]p5: 5736 // The allocation and deallocation functions, operator new, 5737 // operator new[], operator delete and operator delete[], are 5738 // described completely in 3.7.3. The attributes and restrictions 5739 // found in the rest of this subclause do not apply to them unless 5740 // explicitly stated in 3.7.3. 5741 if (Op == OO_Delete || Op == OO_Array_Delete) 5742 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5743 5744 if (Op == OO_New || Op == OO_Array_New) 5745 return CheckOperatorNewDeclaration(*this, FnDecl); 5746 5747 // C++ [over.oper]p6: 5748 // An operator function shall either be a non-static member 5749 // function or be a non-member function and have at least one 5750 // parameter whose type is a class, a reference to a class, an 5751 // enumeration, or a reference to an enumeration. 5752 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5753 if (MethodDecl->isStatic()) 5754 return Diag(FnDecl->getLocation(), 5755 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5756 } else { 5757 bool ClassOrEnumParam = false; 5758 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5759 ParamEnd = FnDecl->param_end(); 5760 Param != ParamEnd; ++Param) { 5761 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5762 if (ParamType->isDependentType() || ParamType->isRecordType() || 5763 ParamType->isEnumeralType()) { 5764 ClassOrEnumParam = true; 5765 break; 5766 } 5767 } 5768 5769 if (!ClassOrEnumParam) 5770 return Diag(FnDecl->getLocation(), 5771 diag::err_operator_overload_needs_class_or_enum) 5772 << FnDecl->getDeclName(); 5773 } 5774 5775 // C++ [over.oper]p8: 5776 // An operator function cannot have default arguments (8.3.6), 5777 // except where explicitly stated below. 5778 // 5779 // Only the function-call operator allows default arguments 5780 // (C++ [over.call]p1). 5781 if (Op != OO_Call) { 5782 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5783 Param != FnDecl->param_end(); ++Param) { 5784 if ((*Param)->hasDefaultArg()) 5785 return Diag((*Param)->getLocation(), 5786 diag::err_operator_overload_default_arg) 5787 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5788 } 5789 } 5790 5791 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5792 { false, false, false } 5793#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5794 , { Unary, Binary, MemberOnly } 5795#include "clang/Basic/OperatorKinds.def" 5796 }; 5797 5798 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5799 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5800 bool MustBeMemberOperator = OperatorUses[Op][2]; 5801 5802 // C++ [over.oper]p8: 5803 // [...] Operator functions cannot have more or fewer parameters 5804 // than the number required for the corresponding operator, as 5805 // described in the rest of this subclause. 5806 unsigned NumParams = FnDecl->getNumParams() 5807 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5808 if (Op != OO_Call && 5809 ((NumParams == 1 && !CanBeUnaryOperator) || 5810 (NumParams == 2 && !CanBeBinaryOperator) || 5811 (NumParams < 1) || (NumParams > 2))) { 5812 // We have the wrong number of parameters. 5813 unsigned ErrorKind; 5814 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5815 ErrorKind = 2; // 2 -> unary or binary. 5816 } else if (CanBeUnaryOperator) { 5817 ErrorKind = 0; // 0 -> unary 5818 } else { 5819 assert(CanBeBinaryOperator && 5820 "All non-call overloaded operators are unary or binary!"); 5821 ErrorKind = 1; // 1 -> binary 5822 } 5823 5824 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5825 << FnDecl->getDeclName() << NumParams << ErrorKind; 5826 } 5827 5828 // Overloaded operators other than operator() cannot be variadic. 5829 if (Op != OO_Call && 5830 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5831 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5832 << FnDecl->getDeclName(); 5833 } 5834 5835 // Some operators must be non-static member functions. 5836 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5837 return Diag(FnDecl->getLocation(), 5838 diag::err_operator_overload_must_be_member) 5839 << FnDecl->getDeclName(); 5840 } 5841 5842 // C++ [over.inc]p1: 5843 // The user-defined function called operator++ implements the 5844 // prefix and postfix ++ operator. If this function is a member 5845 // function with no parameters, or a non-member function with one 5846 // parameter of class or enumeration type, it defines the prefix 5847 // increment operator ++ for objects of that type. If the function 5848 // is a member function with one parameter (which shall be of type 5849 // int) or a non-member function with two parameters (the second 5850 // of which shall be of type int), it defines the postfix 5851 // increment operator ++ for objects of that type. 5852 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5853 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5854 bool ParamIsInt = false; 5855 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5856 ParamIsInt = BT->getKind() == BuiltinType::Int; 5857 5858 if (!ParamIsInt) 5859 return Diag(LastParam->getLocation(), 5860 diag::err_operator_overload_post_incdec_must_be_int) 5861 << LastParam->getType() << (Op == OO_MinusMinus); 5862 } 5863 5864 return false; 5865} 5866 5867/// CheckLiteralOperatorDeclaration - Check whether the declaration 5868/// of this literal operator function is well-formed. If so, returns 5869/// false; otherwise, emits appropriate diagnostics and returns true. 5870bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5871 DeclContext *DC = FnDecl->getDeclContext(); 5872 Decl::Kind Kind = DC->getDeclKind(); 5873 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5874 Kind != Decl::LinkageSpec) { 5875 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5876 << FnDecl->getDeclName(); 5877 return true; 5878 } 5879 5880 bool Valid = false; 5881 5882 // template <char...> type operator "" name() is the only valid template 5883 // signature, and the only valid signature with no parameters. 5884 if (FnDecl->param_size() == 0) { 5885 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5886 // Must have only one template parameter 5887 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5888 if (Params->size() == 1) { 5889 NonTypeTemplateParmDecl *PmDecl = 5890 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5891 5892 // The template parameter must be a char parameter pack. 5893 // FIXME: This test will always fail because non-type parameter packs 5894 // have not been implemented. 5895 if (PmDecl && PmDecl->isTemplateParameterPack() && 5896 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5897 Valid = true; 5898 } 5899 } 5900 } else { 5901 // Check the first parameter 5902 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5903 5904 QualType T = (*Param)->getType(); 5905 5906 // unsigned long long int, long double, and any character type are allowed 5907 // as the only parameters. 5908 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5909 Context.hasSameType(T, Context.LongDoubleTy) || 5910 Context.hasSameType(T, Context.CharTy) || 5911 Context.hasSameType(T, Context.WCharTy) || 5912 Context.hasSameType(T, Context.Char16Ty) || 5913 Context.hasSameType(T, Context.Char32Ty)) { 5914 if (++Param == FnDecl->param_end()) 5915 Valid = true; 5916 goto FinishedParams; 5917 } 5918 5919 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5920 const PointerType *PT = T->getAs<PointerType>(); 5921 if (!PT) 5922 goto FinishedParams; 5923 T = PT->getPointeeType(); 5924 if (!T.isConstQualified()) 5925 goto FinishedParams; 5926 T = T.getUnqualifiedType(); 5927 5928 // Move on to the second parameter; 5929 ++Param; 5930 5931 // If there is no second parameter, the first must be a const char * 5932 if (Param == FnDecl->param_end()) { 5933 if (Context.hasSameType(T, Context.CharTy)) 5934 Valid = true; 5935 goto FinishedParams; 5936 } 5937 5938 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5939 // are allowed as the first parameter to a two-parameter function 5940 if (!(Context.hasSameType(T, Context.CharTy) || 5941 Context.hasSameType(T, Context.WCharTy) || 5942 Context.hasSameType(T, Context.Char16Ty) || 5943 Context.hasSameType(T, Context.Char32Ty))) 5944 goto FinishedParams; 5945 5946 // The second and final parameter must be an std::size_t 5947 T = (*Param)->getType().getUnqualifiedType(); 5948 if (Context.hasSameType(T, Context.getSizeType()) && 5949 ++Param == FnDecl->param_end()) 5950 Valid = true; 5951 } 5952 5953 // FIXME: This diagnostic is absolutely terrible. 5954FinishedParams: 5955 if (!Valid) { 5956 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5957 << FnDecl->getDeclName(); 5958 return true; 5959 } 5960 5961 return false; 5962} 5963 5964/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5965/// linkage specification, including the language and (if present) 5966/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5967/// the location of the language string literal, which is provided 5968/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5969/// the '{' brace. Otherwise, this linkage specification does not 5970/// have any braces. 5971Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 5972 SourceLocation ExternLoc, 5973 SourceLocation LangLoc, 5974 llvm::StringRef Lang, 5975 SourceLocation LBraceLoc) { 5976 LinkageSpecDecl::LanguageIDs Language; 5977 if (Lang == "\"C\"") 5978 Language = LinkageSpecDecl::lang_c; 5979 else if (Lang == "\"C++\"") 5980 Language = LinkageSpecDecl::lang_cxx; 5981 else { 5982 Diag(LangLoc, diag::err_bad_language); 5983 return 0; 5984 } 5985 5986 // FIXME: Add all the various semantics of linkage specifications 5987 5988 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5989 LangLoc, Language, 5990 LBraceLoc.isValid()); 5991 CurContext->addDecl(D); 5992 PushDeclContext(S, D); 5993 return D; 5994} 5995 5996/// ActOnFinishLinkageSpecification - Complete the definition of 5997/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5998/// valid, it's the position of the closing '}' brace in a linkage 5999/// specification that uses braces. 6000Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6001 Decl *LinkageSpec, 6002 SourceLocation RBraceLoc) { 6003 if (LinkageSpec) 6004 PopDeclContext(); 6005 return LinkageSpec; 6006} 6007 6008/// \brief Perform semantic analysis for the variable declaration that 6009/// occurs within a C++ catch clause, returning the newly-created 6010/// variable. 6011VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6012 TypeSourceInfo *TInfo, 6013 IdentifierInfo *Name, 6014 SourceLocation Loc) { 6015 bool Invalid = false; 6016 QualType ExDeclType = TInfo->getType(); 6017 6018 // Arrays and functions decay. 6019 if (ExDeclType->isArrayType()) 6020 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6021 else if (ExDeclType->isFunctionType()) 6022 ExDeclType = Context.getPointerType(ExDeclType); 6023 6024 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6025 // The exception-declaration shall not denote a pointer or reference to an 6026 // incomplete type, other than [cv] void*. 6027 // N2844 forbids rvalue references. 6028 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6029 Diag(Loc, diag::err_catch_rvalue_ref); 6030 Invalid = true; 6031 } 6032 6033 // GCC allows catching pointers and references to incomplete types 6034 // as an extension; so do we, but we warn by default. 6035 6036 QualType BaseType = ExDeclType; 6037 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6038 unsigned DK = diag::err_catch_incomplete; 6039 bool IncompleteCatchIsInvalid = true; 6040 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6041 BaseType = Ptr->getPointeeType(); 6042 Mode = 1; 6043 DK = diag::ext_catch_incomplete_ptr; 6044 IncompleteCatchIsInvalid = false; 6045 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6046 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6047 BaseType = Ref->getPointeeType(); 6048 Mode = 2; 6049 DK = diag::ext_catch_incomplete_ref; 6050 IncompleteCatchIsInvalid = false; 6051 } 6052 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6053 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6054 IncompleteCatchIsInvalid) 6055 Invalid = true; 6056 6057 if (!Invalid && !ExDeclType->isDependentType() && 6058 RequireNonAbstractType(Loc, ExDeclType, 6059 diag::err_abstract_type_in_decl, 6060 AbstractVariableType)) 6061 Invalid = true; 6062 6063 // Only the non-fragile NeXT runtime currently supports C++ catches 6064 // of ObjC types, and no runtime supports catching ObjC types by value. 6065 if (!Invalid && getLangOptions().ObjC1) { 6066 QualType T = ExDeclType; 6067 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6068 T = RT->getPointeeType(); 6069 6070 if (T->isObjCObjectType()) { 6071 Diag(Loc, diag::err_objc_object_catch); 6072 Invalid = true; 6073 } else if (T->isObjCObjectPointerType()) { 6074 if (!getLangOptions().NeXTRuntime) { 6075 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6076 Invalid = true; 6077 } else if (!getLangOptions().ObjCNonFragileABI) { 6078 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6079 Invalid = true; 6080 } 6081 } 6082 } 6083 6084 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6085 Name, ExDeclType, TInfo, SC_None, 6086 SC_None); 6087 ExDecl->setExceptionVariable(true); 6088 6089 if (!Invalid) { 6090 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6091 // C++ [except.handle]p16: 6092 // The object declared in an exception-declaration or, if the 6093 // exception-declaration does not specify a name, a temporary (12.2) is 6094 // copy-initialized (8.5) from the exception object. [...] 6095 // The object is destroyed when the handler exits, after the destruction 6096 // of any automatic objects initialized within the handler. 6097 // 6098 // We just pretend to initialize the object with itself, then make sure 6099 // it can be destroyed later. 6100 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6101 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6102 Loc, ExDeclType, 0); 6103 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6104 SourceLocation()); 6105 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6106 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6107 MultiExprArg(*this, &ExDeclRef, 1)); 6108 if (Result.isInvalid()) 6109 Invalid = true; 6110 else 6111 FinalizeVarWithDestructor(ExDecl, RecordTy); 6112 } 6113 } 6114 6115 if (Invalid) 6116 ExDecl->setInvalidDecl(); 6117 6118 return ExDecl; 6119} 6120 6121/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6122/// handler. 6123Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6124 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6125 QualType ExDeclType = TInfo->getType(); 6126 6127 bool Invalid = D.isInvalidType(); 6128 IdentifierInfo *II = D.getIdentifier(); 6129 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6130 LookupOrdinaryName, 6131 ForRedeclaration)) { 6132 // The scope should be freshly made just for us. There is just no way 6133 // it contains any previous declaration. 6134 assert(!S->isDeclScope(PrevDecl)); 6135 if (PrevDecl->isTemplateParameter()) { 6136 // Maybe we will complain about the shadowed template parameter. 6137 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6138 } 6139 } 6140 6141 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6142 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6143 << D.getCXXScopeSpec().getRange(); 6144 Invalid = true; 6145 } 6146 6147 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6148 D.getIdentifier(), 6149 D.getIdentifierLoc()); 6150 6151 if (Invalid) 6152 ExDecl->setInvalidDecl(); 6153 6154 // Add the exception declaration into this scope. 6155 if (II) 6156 PushOnScopeChains(ExDecl, S); 6157 else 6158 CurContext->addDecl(ExDecl); 6159 6160 ProcessDeclAttributes(S, ExDecl, D); 6161 return ExDecl; 6162} 6163 6164Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6165 Expr *AssertExpr, 6166 Expr *AssertMessageExpr_) { 6167 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6168 6169 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6170 llvm::APSInt Value(32); 6171 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6172 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6173 AssertExpr->getSourceRange(); 6174 return 0; 6175 } 6176 6177 if (Value == 0) { 6178 Diag(AssertLoc, diag::err_static_assert_failed) 6179 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6180 } 6181 } 6182 6183 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6184 AssertExpr, AssertMessage); 6185 6186 CurContext->addDecl(Decl); 6187 return Decl; 6188} 6189 6190/// \brief Perform semantic analysis of the given friend type declaration. 6191/// 6192/// \returns A friend declaration that. 6193FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6194 TypeSourceInfo *TSInfo) { 6195 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6196 6197 QualType T = TSInfo->getType(); 6198 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6199 6200 if (!getLangOptions().CPlusPlus0x) { 6201 // C++03 [class.friend]p2: 6202 // An elaborated-type-specifier shall be used in a friend declaration 6203 // for a class.* 6204 // 6205 // * The class-key of the elaborated-type-specifier is required. 6206 if (!ActiveTemplateInstantiations.empty()) { 6207 // Do not complain about the form of friend template types during 6208 // template instantiation; we will already have complained when the 6209 // template was declared. 6210 } else if (!T->isElaboratedTypeSpecifier()) { 6211 // If we evaluated the type to a record type, suggest putting 6212 // a tag in front. 6213 if (const RecordType *RT = T->getAs<RecordType>()) { 6214 RecordDecl *RD = RT->getDecl(); 6215 6216 std::string InsertionText = std::string(" ") + RD->getKindName(); 6217 6218 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6219 << (unsigned) RD->getTagKind() 6220 << T 6221 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6222 InsertionText); 6223 } else { 6224 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6225 << T 6226 << SourceRange(FriendLoc, TypeRange.getEnd()); 6227 } 6228 } else if (T->getAs<EnumType>()) { 6229 Diag(FriendLoc, diag::ext_enum_friend) 6230 << T 6231 << SourceRange(FriendLoc, TypeRange.getEnd()); 6232 } 6233 } 6234 6235 // C++0x [class.friend]p3: 6236 // If the type specifier in a friend declaration designates a (possibly 6237 // cv-qualified) class type, that class is declared as a friend; otherwise, 6238 // the friend declaration is ignored. 6239 6240 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6241 // in [class.friend]p3 that we do not implement. 6242 6243 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6244} 6245 6246/// Handle a friend tag declaration where the scope specifier was 6247/// templated. 6248Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6249 unsigned TagSpec, SourceLocation TagLoc, 6250 CXXScopeSpec &SS, 6251 IdentifierInfo *Name, SourceLocation NameLoc, 6252 AttributeList *Attr, 6253 MultiTemplateParamsArg TempParamLists) { 6254 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6255 6256 bool isExplicitSpecialization = false; 6257 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6258 bool Invalid = false; 6259 6260 if (TemplateParameterList *TemplateParams 6261 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6262 TempParamLists.get(), 6263 TempParamLists.size(), 6264 /*friend*/ true, 6265 isExplicitSpecialization, 6266 Invalid)) { 6267 --NumMatchedTemplateParamLists; 6268 6269 if (TemplateParams->size() > 0) { 6270 // This is a declaration of a class template. 6271 if (Invalid) 6272 return 0; 6273 6274 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6275 SS, Name, NameLoc, Attr, 6276 TemplateParams, AS_public).take(); 6277 } else { 6278 // The "template<>" header is extraneous. 6279 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6280 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6281 isExplicitSpecialization = true; 6282 } 6283 } 6284 6285 if (Invalid) return 0; 6286 6287 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6288 6289 bool isAllExplicitSpecializations = true; 6290 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6291 if (TempParamLists.get()[I]->size()) { 6292 isAllExplicitSpecializations = false; 6293 break; 6294 } 6295 } 6296 6297 // FIXME: don't ignore attributes. 6298 6299 // If it's explicit specializations all the way down, just forget 6300 // about the template header and build an appropriate non-templated 6301 // friend. TODO: for source fidelity, remember the headers. 6302 if (isAllExplicitSpecializations) { 6303 ElaboratedTypeKeyword Keyword 6304 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6305 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6306 TagLoc, SS.getRange(), NameLoc); 6307 if (T.isNull()) 6308 return 0; 6309 6310 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6311 if (isa<DependentNameType>(T)) { 6312 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6313 TL.setKeywordLoc(TagLoc); 6314 TL.setQualifierRange(SS.getRange()); 6315 TL.setNameLoc(NameLoc); 6316 } else { 6317 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6318 TL.setKeywordLoc(TagLoc); 6319 TL.setQualifierRange(SS.getRange()); 6320 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6321 } 6322 6323 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6324 TSI, FriendLoc); 6325 Friend->setAccess(AS_public); 6326 CurContext->addDecl(Friend); 6327 return Friend; 6328 } 6329 6330 // Handle the case of a templated-scope friend class. e.g. 6331 // template <class T> class A<T>::B; 6332 // FIXME: we don't support these right now. 6333 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6334 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6335 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6336 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6337 TL.setKeywordLoc(TagLoc); 6338 TL.setQualifierRange(SS.getRange()); 6339 TL.setNameLoc(NameLoc); 6340 6341 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6342 TSI, FriendLoc); 6343 Friend->setAccess(AS_public); 6344 Friend->setUnsupportedFriend(true); 6345 CurContext->addDecl(Friend); 6346 return Friend; 6347} 6348 6349 6350/// Handle a friend type declaration. This works in tandem with 6351/// ActOnTag. 6352/// 6353/// Notes on friend class templates: 6354/// 6355/// We generally treat friend class declarations as if they were 6356/// declaring a class. So, for example, the elaborated type specifier 6357/// in a friend declaration is required to obey the restrictions of a 6358/// class-head (i.e. no typedefs in the scope chain), template 6359/// parameters are required to match up with simple template-ids, &c. 6360/// However, unlike when declaring a template specialization, it's 6361/// okay to refer to a template specialization without an empty 6362/// template parameter declaration, e.g. 6363/// friend class A<T>::B<unsigned>; 6364/// We permit this as a special case; if there are any template 6365/// parameters present at all, require proper matching, i.e. 6366/// template <> template <class T> friend class A<int>::B; 6367Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6368 MultiTemplateParamsArg TempParams) { 6369 SourceLocation Loc = DS.getSourceRange().getBegin(); 6370 6371 assert(DS.isFriendSpecified()); 6372 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6373 6374 // Try to convert the decl specifier to a type. This works for 6375 // friend templates because ActOnTag never produces a ClassTemplateDecl 6376 // for a TUK_Friend. 6377 Declarator TheDeclarator(DS, Declarator::MemberContext); 6378 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6379 QualType T = TSI->getType(); 6380 if (TheDeclarator.isInvalidType()) 6381 return 0; 6382 6383 // This is definitely an error in C++98. It's probably meant to 6384 // be forbidden in C++0x, too, but the specification is just 6385 // poorly written. 6386 // 6387 // The problem is with declarations like the following: 6388 // template <T> friend A<T>::foo; 6389 // where deciding whether a class C is a friend or not now hinges 6390 // on whether there exists an instantiation of A that causes 6391 // 'foo' to equal C. There are restrictions on class-heads 6392 // (which we declare (by fiat) elaborated friend declarations to 6393 // be) that makes this tractable. 6394 // 6395 // FIXME: handle "template <> friend class A<T>;", which 6396 // is possibly well-formed? Who even knows? 6397 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6398 Diag(Loc, diag::err_tagless_friend_type_template) 6399 << DS.getSourceRange(); 6400 return 0; 6401 } 6402 6403 // C++98 [class.friend]p1: A friend of a class is a function 6404 // or class that is not a member of the class . . . 6405 // This is fixed in DR77, which just barely didn't make the C++03 6406 // deadline. It's also a very silly restriction that seriously 6407 // affects inner classes and which nobody else seems to implement; 6408 // thus we never diagnose it, not even in -pedantic. 6409 // 6410 // But note that we could warn about it: it's always useless to 6411 // friend one of your own members (it's not, however, worthless to 6412 // friend a member of an arbitrary specialization of your template). 6413 6414 Decl *D; 6415 if (unsigned NumTempParamLists = TempParams.size()) 6416 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6417 NumTempParamLists, 6418 TempParams.release(), 6419 TSI, 6420 DS.getFriendSpecLoc()); 6421 else 6422 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6423 6424 if (!D) 6425 return 0; 6426 6427 D->setAccess(AS_public); 6428 CurContext->addDecl(D); 6429 6430 return D; 6431} 6432 6433Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6434 MultiTemplateParamsArg TemplateParams) { 6435 const DeclSpec &DS = D.getDeclSpec(); 6436 6437 assert(DS.isFriendSpecified()); 6438 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6439 6440 SourceLocation Loc = D.getIdentifierLoc(); 6441 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6442 QualType T = TInfo->getType(); 6443 6444 // C++ [class.friend]p1 6445 // A friend of a class is a function or class.... 6446 // Note that this sees through typedefs, which is intended. 6447 // It *doesn't* see through dependent types, which is correct 6448 // according to [temp.arg.type]p3: 6449 // If a declaration acquires a function type through a 6450 // type dependent on a template-parameter and this causes 6451 // a declaration that does not use the syntactic form of a 6452 // function declarator to have a function type, the program 6453 // is ill-formed. 6454 if (!T->isFunctionType()) { 6455 Diag(Loc, diag::err_unexpected_friend); 6456 6457 // It might be worthwhile to try to recover by creating an 6458 // appropriate declaration. 6459 return 0; 6460 } 6461 6462 // C++ [namespace.memdef]p3 6463 // - If a friend declaration in a non-local class first declares a 6464 // class or function, the friend class or function is a member 6465 // of the innermost enclosing namespace. 6466 // - The name of the friend is not found by simple name lookup 6467 // until a matching declaration is provided in that namespace 6468 // scope (either before or after the class declaration granting 6469 // friendship). 6470 // - If a friend function is called, its name may be found by the 6471 // name lookup that considers functions from namespaces and 6472 // classes associated with the types of the function arguments. 6473 // - When looking for a prior declaration of a class or a function 6474 // declared as a friend, scopes outside the innermost enclosing 6475 // namespace scope are not considered. 6476 6477 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6478 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6479 DeclarationName Name = NameInfo.getName(); 6480 assert(Name); 6481 6482 // The context we found the declaration in, or in which we should 6483 // create the declaration. 6484 DeclContext *DC; 6485 Scope *DCScope = S; 6486 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6487 ForRedeclaration); 6488 6489 // FIXME: there are different rules in local classes 6490 6491 // There are four cases here. 6492 // - There's no scope specifier, in which case we just go to the 6493 // appropriate scope and look for a function or function template 6494 // there as appropriate. 6495 // Recover from invalid scope qualifiers as if they just weren't there. 6496 if (SS.isInvalid() || !SS.isSet()) { 6497 // C++0x [namespace.memdef]p3: 6498 // If the name in a friend declaration is neither qualified nor 6499 // a template-id and the declaration is a function or an 6500 // elaborated-type-specifier, the lookup to determine whether 6501 // the entity has been previously declared shall not consider 6502 // any scopes outside the innermost enclosing namespace. 6503 // C++0x [class.friend]p11: 6504 // If a friend declaration appears in a local class and the name 6505 // specified is an unqualified name, a prior declaration is 6506 // looked up without considering scopes that are outside the 6507 // innermost enclosing non-class scope. For a friend function 6508 // declaration, if there is no prior declaration, the program is 6509 // ill-formed. 6510 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6511 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 6512 6513 // Find the appropriate context according to the above. 6514 DC = CurContext; 6515 while (true) { 6516 // Skip class contexts. If someone can cite chapter and verse 6517 // for this behavior, that would be nice --- it's what GCC and 6518 // EDG do, and it seems like a reasonable intent, but the spec 6519 // really only says that checks for unqualified existing 6520 // declarations should stop at the nearest enclosing namespace, 6521 // not that they should only consider the nearest enclosing 6522 // namespace. 6523 while (DC->isRecord()) 6524 DC = DC->getParent(); 6525 6526 LookupQualifiedName(Previous, DC); 6527 6528 // TODO: decide what we think about using declarations. 6529 if (isLocal || !Previous.empty()) 6530 break; 6531 6532 if (isTemplateId) { 6533 if (isa<TranslationUnitDecl>(DC)) break; 6534 } else { 6535 if (DC->isFileContext()) break; 6536 } 6537 DC = DC->getParent(); 6538 } 6539 6540 // C++ [class.friend]p1: A friend of a class is a function or 6541 // class that is not a member of the class . . . 6542 // C++0x changes this for both friend types and functions. 6543 // Most C++ 98 compilers do seem to give an error here, so 6544 // we do, too. 6545 if (!Previous.empty() && DC->Equals(CurContext) 6546 && !getLangOptions().CPlusPlus0x) 6547 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6548 6549 DCScope = getScopeForDeclContext(S, DC); 6550 6551 // - There's a non-dependent scope specifier, in which case we 6552 // compute it and do a previous lookup there for a function 6553 // or function template. 6554 } else if (!SS.getScopeRep()->isDependent()) { 6555 DC = computeDeclContext(SS); 6556 if (!DC) return 0; 6557 6558 if (RequireCompleteDeclContext(SS, DC)) return 0; 6559 6560 LookupQualifiedName(Previous, DC); 6561 6562 // Ignore things found implicitly in the wrong scope. 6563 // TODO: better diagnostics for this case. Suggesting the right 6564 // qualified scope would be nice... 6565 LookupResult::Filter F = Previous.makeFilter(); 6566 while (F.hasNext()) { 6567 NamedDecl *D = F.next(); 6568 if (!DC->InEnclosingNamespaceSetOf( 6569 D->getDeclContext()->getRedeclContext())) 6570 F.erase(); 6571 } 6572 F.done(); 6573 6574 if (Previous.empty()) { 6575 D.setInvalidType(); 6576 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6577 return 0; 6578 } 6579 6580 // C++ [class.friend]p1: A friend of a class is a function or 6581 // class that is not a member of the class . . . 6582 if (DC->Equals(CurContext)) 6583 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6584 6585 // - There's a scope specifier that does not match any template 6586 // parameter lists, in which case we use some arbitrary context, 6587 // create a method or method template, and wait for instantiation. 6588 // - There's a scope specifier that does match some template 6589 // parameter lists, which we don't handle right now. 6590 } else { 6591 DC = CurContext; 6592 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6593 } 6594 6595 if (!DC->isRecord()) { 6596 // This implies that it has to be an operator or function. 6597 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6598 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6599 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6600 Diag(Loc, diag::err_introducing_special_friend) << 6601 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6602 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6603 return 0; 6604 } 6605 } 6606 6607 bool Redeclaration = false; 6608 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6609 move(TemplateParams), 6610 IsDefinition, 6611 Redeclaration); 6612 if (!ND) return 0; 6613 6614 assert(ND->getDeclContext() == DC); 6615 assert(ND->getLexicalDeclContext() == CurContext); 6616 6617 // Add the function declaration to the appropriate lookup tables, 6618 // adjusting the redeclarations list as necessary. We don't 6619 // want to do this yet if the friending class is dependent. 6620 // 6621 // Also update the scope-based lookup if the target context's 6622 // lookup context is in lexical scope. 6623 if (!CurContext->isDependentContext()) { 6624 DC = DC->getRedeclContext(); 6625 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6626 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6627 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6628 } 6629 6630 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6631 D.getIdentifierLoc(), ND, 6632 DS.getFriendSpecLoc()); 6633 FrD->setAccess(AS_public); 6634 CurContext->addDecl(FrD); 6635 6636 if (ND->isInvalidDecl()) 6637 FrD->setInvalidDecl(); 6638 else { 6639 FunctionDecl *FD; 6640 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 6641 FD = FTD->getTemplatedDecl(); 6642 else 6643 FD = cast<FunctionDecl>(ND); 6644 6645 // Mark templated-scope function declarations as unsupported. 6646 if (FD->getNumTemplateParameterLists()) 6647 FrD->setUnsupportedFriend(true); 6648 } 6649 6650 return ND; 6651} 6652 6653void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6654 AdjustDeclIfTemplate(Dcl); 6655 6656 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6657 if (!Fn) { 6658 Diag(DelLoc, diag::err_deleted_non_function); 6659 return; 6660 } 6661 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6662 Diag(DelLoc, diag::err_deleted_decl_not_first); 6663 Diag(Prev->getLocation(), diag::note_previous_declaration); 6664 // If the declaration wasn't the first, we delete the function anyway for 6665 // recovery. 6666 } 6667 Fn->setDeleted(); 6668} 6669 6670static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6671 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6672 ++CI) { 6673 Stmt *SubStmt = *CI; 6674 if (!SubStmt) 6675 continue; 6676 if (isa<ReturnStmt>(SubStmt)) 6677 Self.Diag(SubStmt->getSourceRange().getBegin(), 6678 diag::err_return_in_constructor_handler); 6679 if (!isa<Expr>(SubStmt)) 6680 SearchForReturnInStmt(Self, SubStmt); 6681 } 6682} 6683 6684void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6685 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6686 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6687 SearchForReturnInStmt(*this, Handler); 6688 } 6689} 6690 6691bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6692 const CXXMethodDecl *Old) { 6693 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6694 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6695 6696 if (Context.hasSameType(NewTy, OldTy) || 6697 NewTy->isDependentType() || OldTy->isDependentType()) 6698 return false; 6699 6700 // Check if the return types are covariant 6701 QualType NewClassTy, OldClassTy; 6702 6703 /// Both types must be pointers or references to classes. 6704 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6705 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6706 NewClassTy = NewPT->getPointeeType(); 6707 OldClassTy = OldPT->getPointeeType(); 6708 } 6709 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6710 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6711 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6712 NewClassTy = NewRT->getPointeeType(); 6713 OldClassTy = OldRT->getPointeeType(); 6714 } 6715 } 6716 } 6717 6718 // The return types aren't either both pointers or references to a class type. 6719 if (NewClassTy.isNull()) { 6720 Diag(New->getLocation(), 6721 diag::err_different_return_type_for_overriding_virtual_function) 6722 << New->getDeclName() << NewTy << OldTy; 6723 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6724 6725 return true; 6726 } 6727 6728 // C++ [class.virtual]p6: 6729 // If the return type of D::f differs from the return type of B::f, the 6730 // class type in the return type of D::f shall be complete at the point of 6731 // declaration of D::f or shall be the class type D. 6732 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6733 if (!RT->isBeingDefined() && 6734 RequireCompleteType(New->getLocation(), NewClassTy, 6735 PDiag(diag::err_covariant_return_incomplete) 6736 << New->getDeclName())) 6737 return true; 6738 } 6739 6740 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6741 // Check if the new class derives from the old class. 6742 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6743 Diag(New->getLocation(), 6744 diag::err_covariant_return_not_derived) 6745 << New->getDeclName() << NewTy << OldTy; 6746 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6747 return true; 6748 } 6749 6750 // Check if we the conversion from derived to base is valid. 6751 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6752 diag::err_covariant_return_inaccessible_base, 6753 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6754 // FIXME: Should this point to the return type? 6755 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6756 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6757 return true; 6758 } 6759 } 6760 6761 // The qualifiers of the return types must be the same. 6762 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6763 Diag(New->getLocation(), 6764 diag::err_covariant_return_type_different_qualifications) 6765 << New->getDeclName() << NewTy << OldTy; 6766 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6767 return true; 6768 }; 6769 6770 6771 // The new class type must have the same or less qualifiers as the old type. 6772 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6773 Diag(New->getLocation(), 6774 diag::err_covariant_return_type_class_type_more_qualified) 6775 << New->getDeclName() << NewTy << OldTy; 6776 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6777 return true; 6778 }; 6779 6780 return false; 6781} 6782 6783bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6784 const CXXMethodDecl *Old) 6785{ 6786 if (Old->hasAttr<FinalAttr>()) { 6787 Diag(New->getLocation(), diag::err_final_function_overridden) 6788 << New->getDeclName(); 6789 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6790 return true; 6791 } 6792 6793 return false; 6794} 6795 6796/// \brief Mark the given method pure. 6797/// 6798/// \param Method the method to be marked pure. 6799/// 6800/// \param InitRange the source range that covers the "0" initializer. 6801bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6802 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6803 Method->setPure(); 6804 return false; 6805 } 6806 6807 if (!Method->isInvalidDecl()) 6808 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6809 << Method->getDeclName() << InitRange; 6810 return true; 6811} 6812 6813/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6814/// an initializer for the out-of-line declaration 'Dcl'. The scope 6815/// is a fresh scope pushed for just this purpose. 6816/// 6817/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6818/// static data member of class X, names should be looked up in the scope of 6819/// class X. 6820void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6821 // If there is no declaration, there was an error parsing it. 6822 if (D == 0) return; 6823 6824 // We should only get called for declarations with scope specifiers, like: 6825 // int foo::bar; 6826 assert(D->isOutOfLine()); 6827 EnterDeclaratorContext(S, D->getDeclContext()); 6828} 6829 6830/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6831/// initializer for the out-of-line declaration 'D'. 6832void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6833 // If there is no declaration, there was an error parsing it. 6834 if (D == 0) return; 6835 6836 assert(D->isOutOfLine()); 6837 ExitDeclaratorContext(S); 6838} 6839 6840/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6841/// C++ if/switch/while/for statement. 6842/// e.g: "if (int x = f()) {...}" 6843DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6844 // C++ 6.4p2: 6845 // The declarator shall not specify a function or an array. 6846 // The type-specifier-seq shall not contain typedef and shall not declare a 6847 // new class or enumeration. 6848 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6849 "Parser allowed 'typedef' as storage class of condition decl."); 6850 6851 TagDecl *OwnedTag = 0; 6852 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6853 QualType Ty = TInfo->getType(); 6854 6855 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6856 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6857 // would be created and CXXConditionDeclExpr wants a VarDecl. 6858 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6859 << D.getSourceRange(); 6860 return DeclResult(); 6861 } else if (OwnedTag && OwnedTag->isDefinition()) { 6862 // The type-specifier-seq shall not declare a new class or enumeration. 6863 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6864 } 6865 6866 Decl *Dcl = ActOnDeclarator(S, D); 6867 if (!Dcl) 6868 return DeclResult(); 6869 6870 return Dcl; 6871} 6872 6873void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6874 bool DefinitionRequired) { 6875 // Ignore any vtable uses in unevaluated operands or for classes that do 6876 // not have a vtable. 6877 if (!Class->isDynamicClass() || Class->isDependentContext() || 6878 CurContext->isDependentContext() || 6879 ExprEvalContexts.back().Context == Unevaluated) 6880 return; 6881 6882 // Try to insert this class into the map. 6883 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6884 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6885 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6886 if (!Pos.second) { 6887 // If we already had an entry, check to see if we are promoting this vtable 6888 // to required a definition. If so, we need to reappend to the VTableUses 6889 // list, since we may have already processed the first entry. 6890 if (DefinitionRequired && !Pos.first->second) { 6891 Pos.first->second = true; 6892 } else { 6893 // Otherwise, we can early exit. 6894 return; 6895 } 6896 } 6897 6898 // Local classes need to have their virtual members marked 6899 // immediately. For all other classes, we mark their virtual members 6900 // at the end of the translation unit. 6901 if (Class->isLocalClass()) 6902 MarkVirtualMembersReferenced(Loc, Class); 6903 else 6904 VTableUses.push_back(std::make_pair(Class, Loc)); 6905} 6906 6907bool Sema::DefineUsedVTables() { 6908 // If any dynamic classes have their key function defined within 6909 // this translation unit, then those vtables are considered "used" and must 6910 // be emitted. 6911 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6912 if (const CXXMethodDecl *KeyFunction 6913 = Context.getKeyFunction(DynamicClasses[I])) { 6914 const FunctionDecl *Definition = 0; 6915 if (KeyFunction->hasBody(Definition)) 6916 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6917 } 6918 } 6919 6920 if (VTableUses.empty()) 6921 return false; 6922 6923 // Note: The VTableUses vector could grow as a result of marking 6924 // the members of a class as "used", so we check the size each 6925 // time through the loop and prefer indices (with are stable) to 6926 // iterators (which are not). 6927 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6928 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6929 if (!Class) 6930 continue; 6931 6932 SourceLocation Loc = VTableUses[I].second; 6933 6934 // If this class has a key function, but that key function is 6935 // defined in another translation unit, we don't need to emit the 6936 // vtable even though we're using it. 6937 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6938 if (KeyFunction && !KeyFunction->hasBody()) { 6939 switch (KeyFunction->getTemplateSpecializationKind()) { 6940 case TSK_Undeclared: 6941 case TSK_ExplicitSpecialization: 6942 case TSK_ExplicitInstantiationDeclaration: 6943 // The key function is in another translation unit. 6944 continue; 6945 6946 case TSK_ExplicitInstantiationDefinition: 6947 case TSK_ImplicitInstantiation: 6948 // We will be instantiating the key function. 6949 break; 6950 } 6951 } else if (!KeyFunction) { 6952 // If we have a class with no key function that is the subject 6953 // of an explicit instantiation declaration, suppress the 6954 // vtable; it will live with the explicit instantiation 6955 // definition. 6956 bool IsExplicitInstantiationDeclaration 6957 = Class->getTemplateSpecializationKind() 6958 == TSK_ExplicitInstantiationDeclaration; 6959 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6960 REnd = Class->redecls_end(); 6961 R != REnd; ++R) { 6962 TemplateSpecializationKind TSK 6963 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6964 if (TSK == TSK_ExplicitInstantiationDeclaration) 6965 IsExplicitInstantiationDeclaration = true; 6966 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6967 IsExplicitInstantiationDeclaration = false; 6968 break; 6969 } 6970 } 6971 6972 if (IsExplicitInstantiationDeclaration) 6973 continue; 6974 } 6975 6976 // Mark all of the virtual members of this class as referenced, so 6977 // that we can build a vtable. Then, tell the AST consumer that a 6978 // vtable for this class is required. 6979 MarkVirtualMembersReferenced(Loc, Class); 6980 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6981 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6982 6983 // Optionally warn if we're emitting a weak vtable. 6984 if (Class->getLinkage() == ExternalLinkage && 6985 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6986 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6987 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6988 } 6989 } 6990 VTableUses.clear(); 6991 6992 return true; 6993} 6994 6995void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6996 const CXXRecordDecl *RD) { 6997 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6998 e = RD->method_end(); i != e; ++i) { 6999 CXXMethodDecl *MD = *i; 7000 7001 // C++ [basic.def.odr]p2: 7002 // [...] A virtual member function is used if it is not pure. [...] 7003 if (MD->isVirtual() && !MD->isPure()) 7004 MarkDeclarationReferenced(Loc, MD); 7005 } 7006 7007 // Only classes that have virtual bases need a VTT. 7008 if (RD->getNumVBases() == 0) 7009 return; 7010 7011 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7012 e = RD->bases_end(); i != e; ++i) { 7013 const CXXRecordDecl *Base = 7014 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7015 if (Base->getNumVBases() == 0) 7016 continue; 7017 MarkVirtualMembersReferenced(Loc, Base); 7018 } 7019} 7020 7021/// SetIvarInitializers - This routine builds initialization ASTs for the 7022/// Objective-C implementation whose ivars need be initialized. 7023void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7024 if (!getLangOptions().CPlusPlus) 7025 return; 7026 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7027 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7028 CollectIvarsToConstructOrDestruct(OID, ivars); 7029 if (ivars.empty()) 7030 return; 7031 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 7032 for (unsigned i = 0; i < ivars.size(); i++) { 7033 FieldDecl *Field = ivars[i]; 7034 if (Field->isInvalidDecl()) 7035 continue; 7036 7037 CXXBaseOrMemberInitializer *Member; 7038 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7039 InitializationKind InitKind = 7040 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7041 7042 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7043 ExprResult MemberInit = 7044 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7045 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 7046 // Note, MemberInit could actually come back empty if no initialization 7047 // is required (e.g., because it would call a trivial default constructor) 7048 if (!MemberInit.get() || MemberInit.isInvalid()) 7049 continue; 7050 7051 Member = 7052 new (Context) CXXBaseOrMemberInitializer(Context, 7053 Field, SourceLocation(), 7054 SourceLocation(), 7055 MemberInit.takeAs<Expr>(), 7056 SourceLocation()); 7057 AllToInit.push_back(Member); 7058 7059 // Be sure that the destructor is accessible and is marked as referenced. 7060 if (const RecordType *RecordTy 7061 = Context.getBaseElementType(Field->getType()) 7062 ->getAs<RecordType>()) { 7063 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7064 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7065 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7066 CheckDestructorAccess(Field->getLocation(), Destructor, 7067 PDiag(diag::err_access_dtor_ivar) 7068 << Context.getBaseElementType(Field->getType())); 7069 } 7070 } 7071 } 7072 ObjCImplementation->setIvarInitializers(Context, 7073 AllToInit.data(), AllToInit.size()); 7074 } 7075} 7076