SemaDeclCXX.cpp revision 4765fa05b5652fcc4356371c2f481d0ea9a1b007
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check that the default argument is well-formed 181 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 182 if (DefaultArgChecker.Visit(DefaultArg)) { 183 Param->setInvalidDecl(); 184 return; 185 } 186 187 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 188} 189 190/// ActOnParamUnparsedDefaultArgument - We've seen a default 191/// argument for a function parameter, but we can't parse it yet 192/// because we're inside a class definition. Note that this default 193/// argument will be parsed later. 194void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 195 SourceLocation EqualLoc, 196 SourceLocation ArgLoc) { 197 if (!param) 198 return; 199 200 ParmVarDecl *Param = cast<ParmVarDecl>(param); 201 if (Param) 202 Param->setUnparsedDefaultArg(); 203 204 UnparsedDefaultArgLocs[Param] = ArgLoc; 205} 206 207/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 208/// the default argument for the parameter param failed. 209void Sema::ActOnParamDefaultArgumentError(Decl *param) { 210 if (!param) 211 return; 212 213 ParmVarDecl *Param = cast<ParmVarDecl>(param); 214 215 Param->setInvalidDecl(); 216 217 UnparsedDefaultArgLocs.erase(Param); 218} 219 220/// CheckExtraCXXDefaultArguments - Check for any extra default 221/// arguments in the declarator, which is not a function declaration 222/// or definition and therefore is not permitted to have default 223/// arguments. This routine should be invoked for every declarator 224/// that is not a function declaration or definition. 225void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 226 // C++ [dcl.fct.default]p3 227 // A default argument expression shall be specified only in the 228 // parameter-declaration-clause of a function declaration or in a 229 // template-parameter (14.1). It shall not be specified for a 230 // parameter pack. If it is specified in a 231 // parameter-declaration-clause, it shall not occur within a 232 // declarator or abstract-declarator of a parameter-declaration. 233 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 234 DeclaratorChunk &chunk = D.getTypeObject(i); 235 if (chunk.Kind == DeclaratorChunk::Function) { 236 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 237 ParmVarDecl *Param = 238 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 239 if (Param->hasUnparsedDefaultArg()) { 240 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 241 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 242 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 243 delete Toks; 244 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 245 } else if (Param->getDefaultArg()) { 246 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 247 << Param->getDefaultArg()->getSourceRange(); 248 Param->setDefaultArg(0); 249 } 250 } 251 } 252 } 253} 254 255// MergeCXXFunctionDecl - Merge two declarations of the same C++ 256// function, once we already know that they have the same 257// type. Subroutine of MergeFunctionDecl. Returns true if there was an 258// error, false otherwise. 259bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 260 bool Invalid = false; 261 262 // C++ [dcl.fct.default]p4: 263 // For non-template functions, default arguments can be added in 264 // later declarations of a function in the same 265 // scope. Declarations in different scopes have completely 266 // distinct sets of default arguments. That is, declarations in 267 // inner scopes do not acquire default arguments from 268 // declarations in outer scopes, and vice versa. In a given 269 // function declaration, all parameters subsequent to a 270 // parameter with a default argument shall have default 271 // arguments supplied in this or previous declarations. A 272 // default argument shall not be redefined by a later 273 // declaration (not even to the same value). 274 // 275 // C++ [dcl.fct.default]p6: 276 // Except for member functions of class templates, the default arguments 277 // in a member function definition that appears outside of the class 278 // definition are added to the set of default arguments provided by the 279 // member function declaration in the class definition. 280 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 281 ParmVarDecl *OldParam = Old->getParamDecl(p); 282 ParmVarDecl *NewParam = New->getParamDecl(p); 283 284 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 285 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 286 // hint here. Alternatively, we could walk the type-source information 287 // for NewParam to find the last source location in the type... but it 288 // isn't worth the effort right now. This is the kind of test case that 289 // is hard to get right: 290 291 // int f(int); 292 // void g(int (*fp)(int) = f); 293 // void g(int (*fp)(int) = &f); 294 Diag(NewParam->getLocation(), 295 diag::err_param_default_argument_redefinition) 296 << NewParam->getDefaultArgRange(); 297 298 // Look for the function declaration where the default argument was 299 // actually written, which may be a declaration prior to Old. 300 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 301 Older; Older = Older->getPreviousDeclaration()) { 302 if (!Older->getParamDecl(p)->hasDefaultArg()) 303 break; 304 305 OldParam = Older->getParamDecl(p); 306 } 307 308 Diag(OldParam->getLocation(), diag::note_previous_definition) 309 << OldParam->getDefaultArgRange(); 310 Invalid = true; 311 } else if (OldParam->hasDefaultArg()) { 312 // Merge the old default argument into the new parameter. 313 // It's important to use getInit() here; getDefaultArg() 314 // strips off any top-level ExprWithCleanups. 315 NewParam->setHasInheritedDefaultArg(); 316 if (OldParam->hasUninstantiatedDefaultArg()) 317 NewParam->setUninstantiatedDefaultArg( 318 OldParam->getUninstantiatedDefaultArg()); 319 else 320 NewParam->setDefaultArg(OldParam->getInit()); 321 } else if (NewParam->hasDefaultArg()) { 322 if (New->getDescribedFunctionTemplate()) { 323 // Paragraph 4, quoted above, only applies to non-template functions. 324 Diag(NewParam->getLocation(), 325 diag::err_param_default_argument_template_redecl) 326 << NewParam->getDefaultArgRange(); 327 Diag(Old->getLocation(), diag::note_template_prev_declaration) 328 << false; 329 } else if (New->getTemplateSpecializationKind() 330 != TSK_ImplicitInstantiation && 331 New->getTemplateSpecializationKind() != TSK_Undeclared) { 332 // C++ [temp.expr.spec]p21: 333 // Default function arguments shall not be specified in a declaration 334 // or a definition for one of the following explicit specializations: 335 // - the explicit specialization of a function template; 336 // - the explicit specialization of a member function template; 337 // - the explicit specialization of a member function of a class 338 // template where the class template specialization to which the 339 // member function specialization belongs is implicitly 340 // instantiated. 341 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 342 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 343 << New->getDeclName() 344 << NewParam->getDefaultArgRange(); 345 } else if (New->getDeclContext()->isDependentContext()) { 346 // C++ [dcl.fct.default]p6 (DR217): 347 // Default arguments for a member function of a class template shall 348 // be specified on the initial declaration of the member function 349 // within the class template. 350 // 351 // Reading the tea leaves a bit in DR217 and its reference to DR205 352 // leads me to the conclusion that one cannot add default function 353 // arguments for an out-of-line definition of a member function of a 354 // dependent type. 355 int WhichKind = 2; 356 if (CXXRecordDecl *Record 357 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 358 if (Record->getDescribedClassTemplate()) 359 WhichKind = 0; 360 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 361 WhichKind = 1; 362 else 363 WhichKind = 2; 364 } 365 366 Diag(NewParam->getLocation(), 367 diag::err_param_default_argument_member_template_redecl) 368 << WhichKind 369 << NewParam->getDefaultArgRange(); 370 } 371 } 372 } 373 374 if (CheckEquivalentExceptionSpec(Old, New)) 375 Invalid = true; 376 377 return Invalid; 378} 379 380/// CheckCXXDefaultArguments - Verify that the default arguments for a 381/// function declaration are well-formed according to C++ 382/// [dcl.fct.default]. 383void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 384 unsigned NumParams = FD->getNumParams(); 385 unsigned p; 386 387 // Find first parameter with a default argument 388 for (p = 0; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (Param->hasDefaultArg()) 391 break; 392 } 393 394 // C++ [dcl.fct.default]p4: 395 // In a given function declaration, all parameters 396 // subsequent to a parameter with a default argument shall 397 // have default arguments supplied in this or previous 398 // declarations. A default argument shall not be redefined 399 // by a later declaration (not even to the same value). 400 unsigned LastMissingDefaultArg = 0; 401 for (; p < NumParams; ++p) { 402 ParmVarDecl *Param = FD->getParamDecl(p); 403 if (!Param->hasDefaultArg()) { 404 if (Param->isInvalidDecl()) 405 /* We already complained about this parameter. */; 406 else if (Param->getIdentifier()) 407 Diag(Param->getLocation(), 408 diag::err_param_default_argument_missing_name) 409 << Param->getIdentifier(); 410 else 411 Diag(Param->getLocation(), 412 diag::err_param_default_argument_missing); 413 414 LastMissingDefaultArg = p; 415 } 416 } 417 418 if (LastMissingDefaultArg > 0) { 419 // Some default arguments were missing. Clear out all of the 420 // default arguments up to (and including) the last missing 421 // default argument, so that we leave the function parameters 422 // in a semantically valid state. 423 for (p = 0; p <= LastMissingDefaultArg; ++p) { 424 ParmVarDecl *Param = FD->getParamDecl(p); 425 if (Param->hasDefaultArg()) { 426 Param->setDefaultArg(0); 427 } 428 } 429 } 430} 431 432/// isCurrentClassName - Determine whether the identifier II is the 433/// name of the class type currently being defined. In the case of 434/// nested classes, this will only return true if II is the name of 435/// the innermost class. 436bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 437 const CXXScopeSpec *SS) { 438 assert(getLangOptions().CPlusPlus && "No class names in C!"); 439 440 CXXRecordDecl *CurDecl; 441 if (SS && SS->isSet() && !SS->isInvalid()) { 442 DeclContext *DC = computeDeclContext(*SS, true); 443 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 444 } else 445 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 446 447 if (CurDecl && CurDecl->getIdentifier()) 448 return &II == CurDecl->getIdentifier(); 449 else 450 return false; 451} 452 453/// \brief Check the validity of a C++ base class specifier. 454/// 455/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 456/// and returns NULL otherwise. 457CXXBaseSpecifier * 458Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 459 SourceRange SpecifierRange, 460 bool Virtual, AccessSpecifier Access, 461 TypeSourceInfo *TInfo) { 462 QualType BaseType = TInfo->getType(); 463 464 // C++ [class.union]p1: 465 // A union shall not have base classes. 466 if (Class->isUnion()) { 467 Diag(Class->getLocation(), diag::err_base_clause_on_union) 468 << SpecifierRange; 469 return 0; 470 } 471 472 if (BaseType->isDependentType()) 473 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 474 Class->getTagKind() == TTK_Class, 475 Access, TInfo); 476 477 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 478 479 // Base specifiers must be record types. 480 if (!BaseType->isRecordType()) { 481 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 482 return 0; 483 } 484 485 // C++ [class.union]p1: 486 // A union shall not be used as a base class. 487 if (BaseType->isUnionType()) { 488 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 489 return 0; 490 } 491 492 // C++ [class.derived]p2: 493 // The class-name in a base-specifier shall not be an incompletely 494 // defined class. 495 if (RequireCompleteType(BaseLoc, BaseType, 496 PDiag(diag::err_incomplete_base_class) 497 << SpecifierRange)) { 498 Class->setInvalidDecl(); 499 return 0; 500 } 501 502 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 503 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 504 assert(BaseDecl && "Record type has no declaration"); 505 BaseDecl = BaseDecl->getDefinition(); 506 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 507 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 508 assert(CXXBaseDecl && "Base type is not a C++ type"); 509 510 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 511 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 512 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 513 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 514 << BaseType; 515 return 0; 516 } 517 518 if (BaseDecl->isInvalidDecl()) 519 Class->setInvalidDecl(); 520 521 // Create the base specifier. 522 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 523 Class->getTagKind() == TTK_Class, 524 Access, TInfo); 525} 526 527/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 528/// one entry in the base class list of a class specifier, for 529/// example: 530/// class foo : public bar, virtual private baz { 531/// 'public bar' and 'virtual private baz' are each base-specifiers. 532BaseResult 533Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 534 bool Virtual, AccessSpecifier Access, 535 ParsedType basetype, SourceLocation BaseLoc) { 536 if (!classdecl) 537 return true; 538 539 AdjustDeclIfTemplate(classdecl); 540 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 541 if (!Class) 542 return true; 543 544 TypeSourceInfo *TInfo = 0; 545 GetTypeFromParser(basetype, &TInfo); 546 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 547 Virtual, Access, TInfo)) 548 return BaseSpec; 549 550 return true; 551} 552 553/// \brief Performs the actual work of attaching the given base class 554/// specifiers to a C++ class. 555bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 556 unsigned NumBases) { 557 if (NumBases == 0) 558 return false; 559 560 // Used to keep track of which base types we have already seen, so 561 // that we can properly diagnose redundant direct base types. Note 562 // that the key is always the unqualified canonical type of the base 563 // class. 564 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 565 566 // Copy non-redundant base specifiers into permanent storage. 567 unsigned NumGoodBases = 0; 568 bool Invalid = false; 569 for (unsigned idx = 0; idx < NumBases; ++idx) { 570 QualType NewBaseType 571 = Context.getCanonicalType(Bases[idx]->getType()); 572 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 573 if (!Class->hasObjectMember()) { 574 if (const RecordType *FDTTy = 575 NewBaseType.getTypePtr()->getAs<RecordType>()) 576 if (FDTTy->getDecl()->hasObjectMember()) 577 Class->setHasObjectMember(true); 578 } 579 580 if (KnownBaseTypes[NewBaseType]) { 581 // C++ [class.mi]p3: 582 // A class shall not be specified as a direct base class of a 583 // derived class more than once. 584 Diag(Bases[idx]->getSourceRange().getBegin(), 585 diag::err_duplicate_base_class) 586 << KnownBaseTypes[NewBaseType]->getType() 587 << Bases[idx]->getSourceRange(); 588 589 // Delete the duplicate base class specifier; we're going to 590 // overwrite its pointer later. 591 Context.Deallocate(Bases[idx]); 592 593 Invalid = true; 594 } else { 595 // Okay, add this new base class. 596 KnownBaseTypes[NewBaseType] = Bases[idx]; 597 Bases[NumGoodBases++] = Bases[idx]; 598 } 599 } 600 601 // Attach the remaining base class specifiers to the derived class. 602 Class->setBases(Bases, NumGoodBases); 603 604 // Delete the remaining (good) base class specifiers, since their 605 // data has been copied into the CXXRecordDecl. 606 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 607 Context.Deallocate(Bases[idx]); 608 609 return Invalid; 610} 611 612/// ActOnBaseSpecifiers - Attach the given base specifiers to the 613/// class, after checking whether there are any duplicate base 614/// classes. 615void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 616 unsigned NumBases) { 617 if (!ClassDecl || !Bases || !NumBases) 618 return; 619 620 AdjustDeclIfTemplate(ClassDecl); 621 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 622 (CXXBaseSpecifier**)(Bases), NumBases); 623} 624 625static CXXRecordDecl *GetClassForType(QualType T) { 626 if (const RecordType *RT = T->getAs<RecordType>()) 627 return cast<CXXRecordDecl>(RT->getDecl()); 628 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 629 return ICT->getDecl(); 630 else 631 return 0; 632} 633 634/// \brief Determine whether the type \p Derived is a C++ class that is 635/// derived from the type \p Base. 636bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 637 if (!getLangOptions().CPlusPlus) 638 return false; 639 640 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 641 if (!DerivedRD) 642 return false; 643 644 CXXRecordDecl *BaseRD = GetClassForType(Base); 645 if (!BaseRD) 646 return false; 647 648 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 649 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 650} 651 652/// \brief Determine whether the type \p Derived is a C++ class that is 653/// derived from the type \p Base. 654bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 655 if (!getLangOptions().CPlusPlus) 656 return false; 657 658 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 659 if (!DerivedRD) 660 return false; 661 662 CXXRecordDecl *BaseRD = GetClassForType(Base); 663 if (!BaseRD) 664 return false; 665 666 return DerivedRD->isDerivedFrom(BaseRD, Paths); 667} 668 669void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 670 CXXCastPath &BasePathArray) { 671 assert(BasePathArray.empty() && "Base path array must be empty!"); 672 assert(Paths.isRecordingPaths() && "Must record paths!"); 673 674 const CXXBasePath &Path = Paths.front(); 675 676 // We first go backward and check if we have a virtual base. 677 // FIXME: It would be better if CXXBasePath had the base specifier for 678 // the nearest virtual base. 679 unsigned Start = 0; 680 for (unsigned I = Path.size(); I != 0; --I) { 681 if (Path[I - 1].Base->isVirtual()) { 682 Start = I - 1; 683 break; 684 } 685 } 686 687 // Now add all bases. 688 for (unsigned I = Start, E = Path.size(); I != E; ++I) 689 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 690} 691 692/// \brief Determine whether the given base path includes a virtual 693/// base class. 694bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 695 for (CXXCastPath::const_iterator B = BasePath.begin(), 696 BEnd = BasePath.end(); 697 B != BEnd; ++B) 698 if ((*B)->isVirtual()) 699 return true; 700 701 return false; 702} 703 704/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 705/// conversion (where Derived and Base are class types) is 706/// well-formed, meaning that the conversion is unambiguous (and 707/// that all of the base classes are accessible). Returns true 708/// and emits a diagnostic if the code is ill-formed, returns false 709/// otherwise. Loc is the location where this routine should point to 710/// if there is an error, and Range is the source range to highlight 711/// if there is an error. 712bool 713Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 714 unsigned InaccessibleBaseID, 715 unsigned AmbigiousBaseConvID, 716 SourceLocation Loc, SourceRange Range, 717 DeclarationName Name, 718 CXXCastPath *BasePath) { 719 // First, determine whether the path from Derived to Base is 720 // ambiguous. This is slightly more expensive than checking whether 721 // the Derived to Base conversion exists, because here we need to 722 // explore multiple paths to determine if there is an ambiguity. 723 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 724 /*DetectVirtual=*/false); 725 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 726 assert(DerivationOkay && 727 "Can only be used with a derived-to-base conversion"); 728 (void)DerivationOkay; 729 730 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 731 if (InaccessibleBaseID) { 732 // Check that the base class can be accessed. 733 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 734 InaccessibleBaseID)) { 735 case AR_inaccessible: 736 return true; 737 case AR_accessible: 738 case AR_dependent: 739 case AR_delayed: 740 break; 741 } 742 } 743 744 // Build a base path if necessary. 745 if (BasePath) 746 BuildBasePathArray(Paths, *BasePath); 747 return false; 748 } 749 750 // We know that the derived-to-base conversion is ambiguous, and 751 // we're going to produce a diagnostic. Perform the derived-to-base 752 // search just one more time to compute all of the possible paths so 753 // that we can print them out. This is more expensive than any of 754 // the previous derived-to-base checks we've done, but at this point 755 // performance isn't as much of an issue. 756 Paths.clear(); 757 Paths.setRecordingPaths(true); 758 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 759 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 760 (void)StillOkay; 761 762 // Build up a textual representation of the ambiguous paths, e.g., 763 // D -> B -> A, that will be used to illustrate the ambiguous 764 // conversions in the diagnostic. We only print one of the paths 765 // to each base class subobject. 766 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 767 768 Diag(Loc, AmbigiousBaseConvID) 769 << Derived << Base << PathDisplayStr << Range << Name; 770 return true; 771} 772 773bool 774Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 775 SourceLocation Loc, SourceRange Range, 776 CXXCastPath *BasePath, 777 bool IgnoreAccess) { 778 return CheckDerivedToBaseConversion(Derived, Base, 779 IgnoreAccess ? 0 780 : diag::err_upcast_to_inaccessible_base, 781 diag::err_ambiguous_derived_to_base_conv, 782 Loc, Range, DeclarationName(), 783 BasePath); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 823Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 824 SourceLocation ASLoc, 825 SourceLocation ColonLoc) { 826 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 827 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 828 ASLoc, ColonLoc); 829 CurContext->addHiddenDecl(ASDecl); 830 return ASDecl; 831} 832 833/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 834/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 835/// bitfield width if there is one and 'InitExpr' specifies the initializer if 836/// any. 837Decl * 838Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 839 MultiTemplateParamsArg TemplateParameterLists, 840 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 841 bool Deleted) { 842 const DeclSpec &DS = D.getDeclSpec(); 843 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 844 DeclarationName Name = NameInfo.getName(); 845 SourceLocation Loc = NameInfo.getLoc(); 846 847 // For anonymous bitfields, the location should point to the type. 848 if (Loc.isInvalid()) 849 Loc = D.getSourceRange().getBegin(); 850 851 Expr *BitWidth = static_cast<Expr*>(BW); 852 Expr *Init = static_cast<Expr*>(InitExpr); 853 854 assert(isa<CXXRecordDecl>(CurContext)); 855 assert(!DS.isFriendSpecified()); 856 857 bool isFunc = false; 858 if (D.isFunctionDeclarator()) 859 isFunc = true; 860 else if (D.getNumTypeObjects() == 0 && 861 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 862 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 863 isFunc = TDType->isFunctionType(); 864 } 865 866 // C++ 9.2p6: A member shall not be declared to have automatic storage 867 // duration (auto, register) or with the extern storage-class-specifier. 868 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 869 // data members and cannot be applied to names declared const or static, 870 // and cannot be applied to reference members. 871 switch (DS.getStorageClassSpec()) { 872 case DeclSpec::SCS_unspecified: 873 case DeclSpec::SCS_typedef: 874 case DeclSpec::SCS_static: 875 // FALL THROUGH. 876 break; 877 case DeclSpec::SCS_mutable: 878 if (isFunc) { 879 if (DS.getStorageClassSpecLoc().isValid()) 880 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 881 else 882 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 883 884 // FIXME: It would be nicer if the keyword was ignored only for this 885 // declarator. Otherwise we could get follow-up errors. 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 break; 889 default: 890 if (DS.getStorageClassSpecLoc().isValid()) 891 Diag(DS.getStorageClassSpecLoc(), 892 diag::err_storageclass_invalid_for_member); 893 else 894 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 895 D.getMutableDeclSpec().ClearStorageClassSpecs(); 896 } 897 898 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 899 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 900 !isFunc); 901 902 Decl *Member; 903 if (isInstField) { 904 CXXScopeSpec &SS = D.getCXXScopeSpec(); 905 906 907 if (SS.isSet() && !SS.isInvalid()) { 908 // The user provided a superfluous scope specifier inside a class 909 // definition: 910 // 911 // class X { 912 // int X::member; 913 // }; 914 DeclContext *DC = 0; 915 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 916 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 917 << Name << FixItHint::CreateRemoval(SS.getRange()); 918 else 919 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 920 << Name << SS.getRange(); 921 922 SS.clear(); 923 } 924 925 // FIXME: Check for template parameters! 926 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 927 AS); 928 assert(Member && "HandleField never returns null"); 929 } else { 930 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 931 if (!Member) { 932 return 0; 933 } 934 935 // Non-instance-fields can't have a bitfield. 936 if (BitWidth) { 937 if (Member->isInvalidDecl()) { 938 // don't emit another diagnostic. 939 } else if (isa<VarDecl>(Member)) { 940 // C++ 9.6p3: A bit-field shall not be a static member. 941 // "static member 'A' cannot be a bit-field" 942 Diag(Loc, diag::err_static_not_bitfield) 943 << Name << BitWidth->getSourceRange(); 944 } else if (isa<TypedefDecl>(Member)) { 945 // "typedef member 'x' cannot be a bit-field" 946 Diag(Loc, diag::err_typedef_not_bitfield) 947 << Name << BitWidth->getSourceRange(); 948 } else { 949 // A function typedef ("typedef int f(); f a;"). 950 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 951 Diag(Loc, diag::err_not_integral_type_bitfield) 952 << Name << cast<ValueDecl>(Member)->getType() 953 << BitWidth->getSourceRange(); 954 } 955 956 BitWidth = 0; 957 Member->setInvalidDecl(); 958 } 959 960 Member->setAccess(AS); 961 962 // If we have declared a member function template, set the access of the 963 // templated declaration as well. 964 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 965 FunTmpl->getTemplatedDecl()->setAccess(AS); 966 } 967 968 assert((Name || isInstField) && "No identifier for non-field ?"); 969 970 if (Init) 971 AddInitializerToDecl(Member, Init, false); 972 if (Deleted) // FIXME: Source location is not very good. 973 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 974 975 if (isInstField) { 976 FieldCollector->Add(cast<FieldDecl>(Member)); 977 return 0; 978 } 979 return Member; 980} 981 982/// \brief Find the direct and/or virtual base specifiers that 983/// correspond to the given base type, for use in base initialization 984/// within a constructor. 985static bool FindBaseInitializer(Sema &SemaRef, 986 CXXRecordDecl *ClassDecl, 987 QualType BaseType, 988 const CXXBaseSpecifier *&DirectBaseSpec, 989 const CXXBaseSpecifier *&VirtualBaseSpec) { 990 // First, check for a direct base class. 991 DirectBaseSpec = 0; 992 for (CXXRecordDecl::base_class_const_iterator Base 993 = ClassDecl->bases_begin(); 994 Base != ClassDecl->bases_end(); ++Base) { 995 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 996 // We found a direct base of this type. That's what we're 997 // initializing. 998 DirectBaseSpec = &*Base; 999 break; 1000 } 1001 } 1002 1003 // Check for a virtual base class. 1004 // FIXME: We might be able to short-circuit this if we know in advance that 1005 // there are no virtual bases. 1006 VirtualBaseSpec = 0; 1007 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1008 // We haven't found a base yet; search the class hierarchy for a 1009 // virtual base class. 1010 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1011 /*DetectVirtual=*/false); 1012 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1013 BaseType, Paths)) { 1014 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1015 Path != Paths.end(); ++Path) { 1016 if (Path->back().Base->isVirtual()) { 1017 VirtualBaseSpec = Path->back().Base; 1018 break; 1019 } 1020 } 1021 } 1022 } 1023 1024 return DirectBaseSpec || VirtualBaseSpec; 1025} 1026 1027/// ActOnMemInitializer - Handle a C++ member initializer. 1028MemInitResult 1029Sema::ActOnMemInitializer(Decl *ConstructorD, 1030 Scope *S, 1031 CXXScopeSpec &SS, 1032 IdentifierInfo *MemberOrBase, 1033 ParsedType TemplateTypeTy, 1034 SourceLocation IdLoc, 1035 SourceLocation LParenLoc, 1036 ExprTy **Args, unsigned NumArgs, 1037 SourceLocation RParenLoc) { 1038 if (!ConstructorD) 1039 return true; 1040 1041 AdjustDeclIfTemplate(ConstructorD); 1042 1043 CXXConstructorDecl *Constructor 1044 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1045 if (!Constructor) { 1046 // The user wrote a constructor initializer on a function that is 1047 // not a C++ constructor. Ignore the error for now, because we may 1048 // have more member initializers coming; we'll diagnose it just 1049 // once in ActOnMemInitializers. 1050 return true; 1051 } 1052 1053 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1054 1055 // C++ [class.base.init]p2: 1056 // Names in a mem-initializer-id are looked up in the scope of the 1057 // constructor's class and, if not found in that scope, are looked 1058 // up in the scope containing the constructor's definition. 1059 // [Note: if the constructor's class contains a member with the 1060 // same name as a direct or virtual base class of the class, a 1061 // mem-initializer-id naming the member or base class and composed 1062 // of a single identifier refers to the class member. A 1063 // mem-initializer-id for the hidden base class may be specified 1064 // using a qualified name. ] 1065 if (!SS.getScopeRep() && !TemplateTypeTy) { 1066 // Look for a member, first. 1067 FieldDecl *Member = 0; 1068 DeclContext::lookup_result Result 1069 = ClassDecl->lookup(MemberOrBase); 1070 if (Result.first != Result.second) { 1071 Member = dyn_cast<FieldDecl>(*Result.first); 1072 1073 if (Member) 1074 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1075 LParenLoc, RParenLoc); 1076 // Handle anonymous union case. 1077 if (IndirectFieldDecl* IndirectField 1078 = dyn_cast<IndirectFieldDecl>(*Result.first)) 1079 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1080 NumArgs, IdLoc, 1081 LParenLoc, RParenLoc); 1082 } 1083 } 1084 // It didn't name a member, so see if it names a class. 1085 QualType BaseType; 1086 TypeSourceInfo *TInfo = 0; 1087 1088 if (TemplateTypeTy) { 1089 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1090 } else { 1091 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1092 LookupParsedName(R, S, &SS); 1093 1094 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1095 if (!TyD) { 1096 if (R.isAmbiguous()) return true; 1097 1098 // We don't want access-control diagnostics here. 1099 R.suppressDiagnostics(); 1100 1101 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1102 bool NotUnknownSpecialization = false; 1103 DeclContext *DC = computeDeclContext(SS, false); 1104 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1105 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1106 1107 if (!NotUnknownSpecialization) { 1108 // When the scope specifier can refer to a member of an unknown 1109 // specialization, we take it as a type name. 1110 BaseType = CheckTypenameType(ETK_None, 1111 (NestedNameSpecifier *)SS.getScopeRep(), 1112 *MemberOrBase, SourceLocation(), 1113 SS.getRange(), IdLoc); 1114 if (BaseType.isNull()) 1115 return true; 1116 1117 R.clear(); 1118 R.setLookupName(MemberOrBase); 1119 } 1120 } 1121 1122 // If no results were found, try to correct typos. 1123 if (R.empty() && BaseType.isNull() && 1124 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1125 R.isSingleResult()) { 1126 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1127 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1128 // We have found a non-static data member with a similar 1129 // name to what was typed; complain and initialize that 1130 // member. 1131 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1132 << MemberOrBase << true << R.getLookupName() 1133 << FixItHint::CreateReplacement(R.getNameLoc(), 1134 R.getLookupName().getAsString()); 1135 Diag(Member->getLocation(), diag::note_previous_decl) 1136 << Member->getDeclName(); 1137 1138 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1139 LParenLoc, RParenLoc); 1140 } 1141 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1142 const CXXBaseSpecifier *DirectBaseSpec; 1143 const CXXBaseSpecifier *VirtualBaseSpec; 1144 if (FindBaseInitializer(*this, ClassDecl, 1145 Context.getTypeDeclType(Type), 1146 DirectBaseSpec, VirtualBaseSpec)) { 1147 // We have found a direct or virtual base class with a 1148 // similar name to what was typed; complain and initialize 1149 // that base class. 1150 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1151 << MemberOrBase << false << R.getLookupName() 1152 << FixItHint::CreateReplacement(R.getNameLoc(), 1153 R.getLookupName().getAsString()); 1154 1155 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1156 : VirtualBaseSpec; 1157 Diag(BaseSpec->getSourceRange().getBegin(), 1158 diag::note_base_class_specified_here) 1159 << BaseSpec->getType() 1160 << BaseSpec->getSourceRange(); 1161 1162 TyD = Type; 1163 } 1164 } 1165 } 1166 1167 if (!TyD && BaseType.isNull()) { 1168 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1169 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1170 return true; 1171 } 1172 } 1173 1174 if (BaseType.isNull()) { 1175 BaseType = Context.getTypeDeclType(TyD); 1176 if (SS.isSet()) { 1177 NestedNameSpecifier *Qualifier = 1178 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1179 1180 // FIXME: preserve source range information 1181 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1182 } 1183 } 1184 } 1185 1186 if (!TInfo) 1187 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1188 1189 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1190 LParenLoc, RParenLoc, ClassDecl); 1191} 1192 1193/// Checks an initializer expression for use of uninitialized fields, such as 1194/// containing the field that is being initialized. Returns true if there is an 1195/// uninitialized field was used an updates the SourceLocation parameter; false 1196/// otherwise. 1197static bool InitExprContainsUninitializedFields(const Stmt *S, 1198 const ValueDecl *LhsField, 1199 SourceLocation *L) { 1200 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1201 1202 if (isa<CallExpr>(S)) { 1203 // Do not descend into function calls or constructors, as the use 1204 // of an uninitialized field may be valid. One would have to inspect 1205 // the contents of the function/ctor to determine if it is safe or not. 1206 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1207 // may be safe, depending on what the function/ctor does. 1208 return false; 1209 } 1210 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1211 const NamedDecl *RhsField = ME->getMemberDecl(); 1212 1213 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1214 // The member expression points to a static data member. 1215 assert(VD->isStaticDataMember() && 1216 "Member points to non-static data member!"); 1217 (void)VD; 1218 return false; 1219 } 1220 1221 if (isa<EnumConstantDecl>(RhsField)) { 1222 // The member expression points to an enum. 1223 return false; 1224 } 1225 1226 if (RhsField == LhsField) { 1227 // Initializing a field with itself. Throw a warning. 1228 // But wait; there are exceptions! 1229 // Exception #1: The field may not belong to this record. 1230 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1231 const Expr *base = ME->getBase(); 1232 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1233 // Even though the field matches, it does not belong to this record. 1234 return false; 1235 } 1236 // None of the exceptions triggered; return true to indicate an 1237 // uninitialized field was used. 1238 *L = ME->getMemberLoc(); 1239 return true; 1240 } 1241 } else if (isa<SizeOfAlignOfExpr>(S)) { 1242 // sizeof/alignof doesn't reference contents, do not warn. 1243 return false; 1244 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1245 // address-of doesn't reference contents (the pointer may be dereferenced 1246 // in the same expression but it would be rare; and weird). 1247 if (UOE->getOpcode() == UO_AddrOf) 1248 return false; 1249 } 1250 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1251 it != e; ++it) { 1252 if (!*it) { 1253 // An expression such as 'member(arg ?: "")' may trigger this. 1254 continue; 1255 } 1256 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1257 return true; 1258 } 1259 return false; 1260} 1261 1262template <typename T> 1263MemInitResult 1264Sema::BuildMemberInitializer(T *Member, Expr **Args, 1265 unsigned NumArgs, SourceLocation IdLoc, 1266 SourceLocation LParenLoc, 1267 SourceLocation RParenLoc) { 1268 assert((isa<FieldDecl>(Member) || isa<IndirectFieldDecl>(Member)) || 1269 "Member must be a FieldDecl or IndirectFieldDecl"); 1270 1271 if (Member->isInvalidDecl()) 1272 return true; 1273 1274 // Diagnose value-uses of fields to initialize themselves, e.g. 1275 // foo(foo) 1276 // where foo is not also a parameter to the constructor. 1277 // TODO: implement -Wuninitialized and fold this into that framework. 1278 for (unsigned i = 0; i < NumArgs; ++i) { 1279 SourceLocation L; 1280 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1281 // FIXME: Return true in the case when other fields are used before being 1282 // uninitialized. For example, let this field be the i'th field. When 1283 // initializing the i'th field, throw a warning if any of the >= i'th 1284 // fields are used, as they are not yet initialized. 1285 // Right now we are only handling the case where the i'th field uses 1286 // itself in its initializer. 1287 Diag(L, diag::warn_field_is_uninit); 1288 } 1289 } 1290 1291 bool HasDependentArg = false; 1292 for (unsigned i = 0; i < NumArgs; i++) 1293 HasDependentArg |= Args[i]->isTypeDependent(); 1294 1295 if (Member->getType()->isDependentType() || HasDependentArg) { 1296 // Can't check initialization for a member of dependent type or when 1297 // any of the arguments are type-dependent expressions. 1298 Expr *Init 1299 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1300 RParenLoc); 1301 1302 // Erase any temporaries within this evaluation context; we're not 1303 // going to track them in the AST, since we'll be rebuilding the 1304 // ASTs during template instantiation. 1305 ExprTemporaries.erase( 1306 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1307 ExprTemporaries.end()); 1308 1309 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1310 LParenLoc, 1311 Init, 1312 RParenLoc); 1313 1314 } 1315 1316 // Initialize the member. 1317 InitializedEntity MemberEntity = 1318 InitializedEntity::InitializeMember(Member, 0); 1319 InitializationKind Kind = 1320 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1321 1322 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1323 1324 ExprResult MemberInit = 1325 InitSeq.Perform(*this, MemberEntity, Kind, 1326 MultiExprArg(*this, Args, NumArgs), 0); 1327 if (MemberInit.isInvalid()) 1328 return true; 1329 1330 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1331 1332 // C++0x [class.base.init]p7: 1333 // The initialization of each base and member constitutes a 1334 // full-expression. 1335 MemberInit = MaybeCreateExprWithCleanups(MemberInit.get()); 1336 if (MemberInit.isInvalid()) 1337 return true; 1338 1339 // If we are in a dependent context, template instantiation will 1340 // perform this type-checking again. Just save the arguments that we 1341 // received in a ParenListExpr. 1342 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1343 // of the information that we have about the member 1344 // initializer. However, deconstructing the ASTs is a dicey process, 1345 // and this approach is far more likely to get the corner cases right. 1346 if (CurContext->isDependentContext()) { 1347 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1348 RParenLoc); 1349 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1350 LParenLoc, 1351 Init, 1352 RParenLoc); 1353 } 1354 1355 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1356 LParenLoc, 1357 MemberInit.get(), 1358 RParenLoc); 1359} 1360 1361MemInitResult 1362Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1363 Expr **Args, unsigned NumArgs, 1364 SourceLocation LParenLoc, SourceLocation RParenLoc, 1365 CXXRecordDecl *ClassDecl) { 1366 bool HasDependentArg = false; 1367 for (unsigned i = 0; i < NumArgs; i++) 1368 HasDependentArg |= Args[i]->isTypeDependent(); 1369 1370 SourceLocation BaseLoc 1371 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1372 1373 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1374 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1375 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1376 1377 // C++ [class.base.init]p2: 1378 // [...] Unless the mem-initializer-id names a nonstatic data 1379 // member of the constructor's class or a direct or virtual base 1380 // of that class, the mem-initializer is ill-formed. A 1381 // mem-initializer-list can initialize a base class using any 1382 // name that denotes that base class type. 1383 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1384 1385 // Check for direct and virtual base classes. 1386 const CXXBaseSpecifier *DirectBaseSpec = 0; 1387 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1388 if (!Dependent) { 1389 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1390 VirtualBaseSpec); 1391 1392 // C++ [base.class.init]p2: 1393 // Unless the mem-initializer-id names a nonstatic data member of the 1394 // constructor's class or a direct or virtual base of that class, the 1395 // mem-initializer is ill-formed. 1396 if (!DirectBaseSpec && !VirtualBaseSpec) { 1397 // If the class has any dependent bases, then it's possible that 1398 // one of those types will resolve to the same type as 1399 // BaseType. Therefore, just treat this as a dependent base 1400 // class initialization. FIXME: Should we try to check the 1401 // initialization anyway? It seems odd. 1402 if (ClassDecl->hasAnyDependentBases()) 1403 Dependent = true; 1404 else 1405 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1406 << BaseType << Context.getTypeDeclType(ClassDecl) 1407 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1408 } 1409 } 1410 1411 if (Dependent) { 1412 // Can't check initialization for a base of dependent type or when 1413 // any of the arguments are type-dependent expressions. 1414 ExprResult BaseInit 1415 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1416 RParenLoc)); 1417 1418 // Erase any temporaries within this evaluation context; we're not 1419 // going to track them in the AST, since we'll be rebuilding the 1420 // ASTs during template instantiation. 1421 ExprTemporaries.erase( 1422 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1423 ExprTemporaries.end()); 1424 1425 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1426 /*IsVirtual=*/false, 1427 LParenLoc, 1428 BaseInit.takeAs<Expr>(), 1429 RParenLoc); 1430 } 1431 1432 // C++ [base.class.init]p2: 1433 // If a mem-initializer-id is ambiguous because it designates both 1434 // a direct non-virtual base class and an inherited virtual base 1435 // class, the mem-initializer is ill-formed. 1436 if (DirectBaseSpec && VirtualBaseSpec) 1437 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1438 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1439 1440 CXXBaseSpecifier *BaseSpec 1441 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1442 if (!BaseSpec) 1443 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1444 1445 // Initialize the base. 1446 InitializedEntity BaseEntity = 1447 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1448 InitializationKind Kind = 1449 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1450 1451 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1452 1453 ExprResult BaseInit = 1454 InitSeq.Perform(*this, BaseEntity, Kind, 1455 MultiExprArg(*this, Args, NumArgs), 0); 1456 if (BaseInit.isInvalid()) 1457 return true; 1458 1459 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1460 1461 // C++0x [class.base.init]p7: 1462 // The initialization of each base and member constitutes a 1463 // full-expression. 1464 BaseInit = MaybeCreateExprWithCleanups(BaseInit.get()); 1465 if (BaseInit.isInvalid()) 1466 return true; 1467 1468 // If we are in a dependent context, template instantiation will 1469 // perform this type-checking again. Just save the arguments that we 1470 // received in a ParenListExpr. 1471 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1472 // of the information that we have about the base 1473 // initializer. However, deconstructing the ASTs is a dicey process, 1474 // and this approach is far more likely to get the corner cases right. 1475 if (CurContext->isDependentContext()) { 1476 ExprResult Init 1477 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1478 RParenLoc)); 1479 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1480 BaseSpec->isVirtual(), 1481 LParenLoc, 1482 Init.takeAs<Expr>(), 1483 RParenLoc); 1484 } 1485 1486 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1487 BaseSpec->isVirtual(), 1488 LParenLoc, 1489 BaseInit.takeAs<Expr>(), 1490 RParenLoc); 1491} 1492 1493/// ImplicitInitializerKind - How an implicit base or member initializer should 1494/// initialize its base or member. 1495enum ImplicitInitializerKind { 1496 IIK_Default, 1497 IIK_Copy, 1498 IIK_Move 1499}; 1500 1501static bool 1502BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1503 ImplicitInitializerKind ImplicitInitKind, 1504 CXXBaseSpecifier *BaseSpec, 1505 bool IsInheritedVirtualBase, 1506 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1507 InitializedEntity InitEntity 1508 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1509 IsInheritedVirtualBase); 1510 1511 ExprResult BaseInit; 1512 1513 switch (ImplicitInitKind) { 1514 case IIK_Default: { 1515 InitializationKind InitKind 1516 = InitializationKind::CreateDefault(Constructor->getLocation()); 1517 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1518 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1519 MultiExprArg(SemaRef, 0, 0)); 1520 break; 1521 } 1522 1523 case IIK_Copy: { 1524 ParmVarDecl *Param = Constructor->getParamDecl(0); 1525 QualType ParamType = Param->getType().getNonReferenceType(); 1526 1527 Expr *CopyCtorArg = 1528 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1529 Constructor->getLocation(), ParamType, 1530 VK_LValue, 0); 1531 1532 // Cast to the base class to avoid ambiguities. 1533 QualType ArgTy = 1534 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1535 ParamType.getQualifiers()); 1536 1537 CXXCastPath BasePath; 1538 BasePath.push_back(BaseSpec); 1539 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1540 CK_UncheckedDerivedToBase, 1541 VK_LValue, &BasePath); 1542 1543 InitializationKind InitKind 1544 = InitializationKind::CreateDirect(Constructor->getLocation(), 1545 SourceLocation(), SourceLocation()); 1546 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1547 &CopyCtorArg, 1); 1548 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1549 MultiExprArg(&CopyCtorArg, 1)); 1550 break; 1551 } 1552 1553 case IIK_Move: 1554 assert(false && "Unhandled initializer kind!"); 1555 } 1556 1557 if (BaseInit.isInvalid()) 1558 return true; 1559 1560 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit.get()); 1561 if (BaseInit.isInvalid()) 1562 return true; 1563 1564 CXXBaseInit = 1565 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1566 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1567 SourceLocation()), 1568 BaseSpec->isVirtual(), 1569 SourceLocation(), 1570 BaseInit.takeAs<Expr>(), 1571 SourceLocation()); 1572 1573 return false; 1574} 1575 1576static bool 1577BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1578 ImplicitInitializerKind ImplicitInitKind, 1579 FieldDecl *Field, 1580 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1581 if (Field->isInvalidDecl()) 1582 return true; 1583 1584 SourceLocation Loc = Constructor->getLocation(); 1585 1586 if (ImplicitInitKind == IIK_Copy) { 1587 ParmVarDecl *Param = Constructor->getParamDecl(0); 1588 QualType ParamType = Param->getType().getNonReferenceType(); 1589 1590 Expr *MemberExprBase = 1591 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1592 Loc, ParamType, VK_LValue, 0); 1593 1594 // Build a reference to this field within the parameter. 1595 CXXScopeSpec SS; 1596 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1597 Sema::LookupMemberName); 1598 MemberLookup.addDecl(Field, AS_public); 1599 MemberLookup.resolveKind(); 1600 ExprResult CopyCtorArg 1601 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1602 ParamType, Loc, 1603 /*IsArrow=*/false, 1604 SS, 1605 /*FirstQualifierInScope=*/0, 1606 MemberLookup, 1607 /*TemplateArgs=*/0); 1608 if (CopyCtorArg.isInvalid()) 1609 return true; 1610 1611 // When the field we are copying is an array, create index variables for 1612 // each dimension of the array. We use these index variables to subscript 1613 // the source array, and other clients (e.g., CodeGen) will perform the 1614 // necessary iteration with these index variables. 1615 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1616 QualType BaseType = Field->getType(); 1617 QualType SizeType = SemaRef.Context.getSizeType(); 1618 while (const ConstantArrayType *Array 1619 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1620 // Create the iteration variable for this array index. 1621 IdentifierInfo *IterationVarName = 0; 1622 { 1623 llvm::SmallString<8> Str; 1624 llvm::raw_svector_ostream OS(Str); 1625 OS << "__i" << IndexVariables.size(); 1626 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1627 } 1628 VarDecl *IterationVar 1629 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1630 IterationVarName, SizeType, 1631 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1632 SC_None, SC_None); 1633 IndexVariables.push_back(IterationVar); 1634 1635 // Create a reference to the iteration variable. 1636 ExprResult IterationVarRef 1637 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1638 assert(!IterationVarRef.isInvalid() && 1639 "Reference to invented variable cannot fail!"); 1640 1641 // Subscript the array with this iteration variable. 1642 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1643 Loc, 1644 IterationVarRef.take(), 1645 Loc); 1646 if (CopyCtorArg.isInvalid()) 1647 return true; 1648 1649 BaseType = Array->getElementType(); 1650 } 1651 1652 // Construct the entity that we will be initializing. For an array, this 1653 // will be first element in the array, which may require several levels 1654 // of array-subscript entities. 1655 llvm::SmallVector<InitializedEntity, 4> Entities; 1656 Entities.reserve(1 + IndexVariables.size()); 1657 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1658 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1659 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1660 0, 1661 Entities.back())); 1662 1663 // Direct-initialize to use the copy constructor. 1664 InitializationKind InitKind = 1665 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1666 1667 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1668 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1669 &CopyCtorArgE, 1); 1670 1671 ExprResult MemberInit 1672 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1673 MultiExprArg(&CopyCtorArgE, 1)); 1674 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit.get()); 1675 if (MemberInit.isInvalid()) 1676 return true; 1677 1678 CXXMemberInit 1679 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1680 MemberInit.takeAs<Expr>(), Loc, 1681 IndexVariables.data(), 1682 IndexVariables.size()); 1683 return false; 1684 } 1685 1686 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1687 1688 QualType FieldBaseElementType = 1689 SemaRef.Context.getBaseElementType(Field->getType()); 1690 1691 if (FieldBaseElementType->isRecordType()) { 1692 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1693 InitializationKind InitKind = 1694 InitializationKind::CreateDefault(Loc); 1695 1696 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1697 ExprResult MemberInit = 1698 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1699 if (MemberInit.isInvalid()) 1700 return true; 1701 1702 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit.get()); 1703 if (MemberInit.isInvalid()) 1704 return true; 1705 1706 CXXMemberInit = 1707 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1708 Field, Loc, Loc, 1709 MemberInit.get(), 1710 Loc); 1711 return false; 1712 } 1713 1714 if (FieldBaseElementType->isReferenceType()) { 1715 SemaRef.Diag(Constructor->getLocation(), 1716 diag::err_uninitialized_member_in_ctor) 1717 << (int)Constructor->isImplicit() 1718 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1719 << 0 << Field->getDeclName(); 1720 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1721 return true; 1722 } 1723 1724 if (FieldBaseElementType.isConstQualified()) { 1725 SemaRef.Diag(Constructor->getLocation(), 1726 diag::err_uninitialized_member_in_ctor) 1727 << (int)Constructor->isImplicit() 1728 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1729 << 1 << Field->getDeclName(); 1730 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1731 return true; 1732 } 1733 1734 // Nothing to initialize. 1735 CXXMemberInit = 0; 1736 return false; 1737} 1738 1739namespace { 1740struct BaseAndFieldInfo { 1741 Sema &S; 1742 CXXConstructorDecl *Ctor; 1743 bool AnyErrorsInInits; 1744 ImplicitInitializerKind IIK; 1745 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1746 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1747 1748 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1749 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1750 // FIXME: Handle implicit move constructors. 1751 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1752 IIK = IIK_Copy; 1753 else 1754 IIK = IIK_Default; 1755 } 1756}; 1757} 1758 1759static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1760 FieldDecl *Top, FieldDecl *Field) { 1761 1762 // Overwhelmingly common case: we have a direct initializer for this field. 1763 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1764 Info.AllToInit.push_back(Init); 1765 return false; 1766 } 1767 1768 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1769 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1770 assert(FieldClassType && "anonymous struct/union without record type"); 1771 CXXRecordDecl *FieldClassDecl 1772 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1773 1774 // Even though union members never have non-trivial default 1775 // constructions in C++03, we still build member initializers for aggregate 1776 // record types which can be union members, and C++0x allows non-trivial 1777 // default constructors for union members, so we ensure that only one 1778 // member is initialized for these. 1779 if (FieldClassDecl->isUnion()) { 1780 // First check for an explicit initializer for one field. 1781 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1782 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1783 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1784 Info.AllToInit.push_back(Init); 1785 1786 // Once we've initialized a field of an anonymous union, the union 1787 // field in the class is also initialized, so exit immediately. 1788 return false; 1789 } else if ((*FA)->isAnonymousStructOrUnion()) { 1790 if (CollectFieldInitializer(Info, Top, *FA)) 1791 return true; 1792 } 1793 } 1794 1795 // Fallthrough and construct a default initializer for the union as 1796 // a whole, which can call its default constructor if such a thing exists 1797 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1798 // behavior going forward with C++0x, when anonymous unions there are 1799 // finalized, we should revisit this. 1800 } else { 1801 // For structs, we simply descend through to initialize all members where 1802 // necessary. 1803 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1804 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1805 if (CollectFieldInitializer(Info, Top, *FA)) 1806 return true; 1807 } 1808 } 1809 } 1810 1811 // Don't try to build an implicit initializer if there were semantic 1812 // errors in any of the initializers (and therefore we might be 1813 // missing some that the user actually wrote). 1814 if (Info.AnyErrorsInInits) 1815 return false; 1816 1817 CXXBaseOrMemberInitializer *Init = 0; 1818 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1819 return true; 1820 1821 if (Init) 1822 Info.AllToInit.push_back(Init); 1823 1824 return false; 1825} 1826 1827bool 1828Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1829 CXXBaseOrMemberInitializer **Initializers, 1830 unsigned NumInitializers, 1831 bool AnyErrors) { 1832 if (Constructor->getDeclContext()->isDependentContext()) { 1833 // Just store the initializers as written, they will be checked during 1834 // instantiation. 1835 if (NumInitializers > 0) { 1836 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1837 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1838 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1839 memcpy(baseOrMemberInitializers, Initializers, 1840 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1841 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1842 } 1843 1844 return false; 1845 } 1846 1847 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1848 1849 // We need to build the initializer AST according to order of construction 1850 // and not what user specified in the Initializers list. 1851 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1852 if (!ClassDecl) 1853 return true; 1854 1855 bool HadError = false; 1856 1857 for (unsigned i = 0; i < NumInitializers; i++) { 1858 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1859 1860 if (Member->isBaseInitializer()) 1861 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1862 else 1863 Info.AllBaseFields[Member->getAnyMember()] = Member; 1864 } 1865 1866 // Keep track of the direct virtual bases. 1867 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1868 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1869 E = ClassDecl->bases_end(); I != E; ++I) { 1870 if (I->isVirtual()) 1871 DirectVBases.insert(I); 1872 } 1873 1874 // Push virtual bases before others. 1875 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1876 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1877 1878 if (CXXBaseOrMemberInitializer *Value 1879 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1880 Info.AllToInit.push_back(Value); 1881 } else if (!AnyErrors) { 1882 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1883 CXXBaseOrMemberInitializer *CXXBaseInit; 1884 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1885 VBase, IsInheritedVirtualBase, 1886 CXXBaseInit)) { 1887 HadError = true; 1888 continue; 1889 } 1890 1891 Info.AllToInit.push_back(CXXBaseInit); 1892 } 1893 } 1894 1895 // Non-virtual bases. 1896 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1897 E = ClassDecl->bases_end(); Base != E; ++Base) { 1898 // Virtuals are in the virtual base list and already constructed. 1899 if (Base->isVirtual()) 1900 continue; 1901 1902 if (CXXBaseOrMemberInitializer *Value 1903 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1904 Info.AllToInit.push_back(Value); 1905 } else if (!AnyErrors) { 1906 CXXBaseOrMemberInitializer *CXXBaseInit; 1907 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1908 Base, /*IsInheritedVirtualBase=*/false, 1909 CXXBaseInit)) { 1910 HadError = true; 1911 continue; 1912 } 1913 1914 Info.AllToInit.push_back(CXXBaseInit); 1915 } 1916 } 1917 1918 // Fields. 1919 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1920 E = ClassDecl->field_end(); Field != E; ++Field) { 1921 if ((*Field)->getType()->isIncompleteArrayType()) { 1922 assert(ClassDecl->hasFlexibleArrayMember() && 1923 "Incomplete array type is not valid"); 1924 continue; 1925 } 1926 if (CollectFieldInitializer(Info, *Field, *Field)) 1927 HadError = true; 1928 } 1929 1930 NumInitializers = Info.AllToInit.size(); 1931 if (NumInitializers > 0) { 1932 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1933 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1934 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1935 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1936 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1937 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1938 1939 // Constructors implicitly reference the base and member 1940 // destructors. 1941 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1942 Constructor->getParent()); 1943 } 1944 1945 return HadError; 1946} 1947 1948static void *GetKeyForTopLevelField(FieldDecl *Field) { 1949 // For anonymous unions, use the class declaration as the key. 1950 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1951 if (RT->getDecl()->isAnonymousStructOrUnion()) 1952 return static_cast<void *>(RT->getDecl()); 1953 } 1954 return static_cast<void *>(Field); 1955} 1956 1957static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1958 return Context.getCanonicalType(BaseType).getTypePtr(); 1959} 1960 1961static void *GetKeyForMember(ASTContext &Context, 1962 CXXBaseOrMemberInitializer *Member) { 1963 if (!Member->isAnyMemberInitializer()) 1964 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1965 1966 // For fields injected into the class via declaration of an anonymous union, 1967 // use its anonymous union class declaration as the unique key. 1968 FieldDecl *Field = Member->getAnyMember(); 1969 1970 // If the field is a member of an anonymous struct or union, our key 1971 // is the anonymous record decl that's a direct child of the class. 1972 RecordDecl *RD = Field->getParent(); 1973 if (RD->isAnonymousStructOrUnion()) { 1974 while (true) { 1975 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1976 if (Parent->isAnonymousStructOrUnion()) 1977 RD = Parent; 1978 else 1979 break; 1980 } 1981 1982 return static_cast<void *>(RD); 1983 } 1984 1985 return static_cast<void *>(Field); 1986} 1987 1988static void 1989DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1990 const CXXConstructorDecl *Constructor, 1991 CXXBaseOrMemberInitializer **Inits, 1992 unsigned NumInits) { 1993 if (Constructor->getDeclContext()->isDependentContext()) 1994 return; 1995 1996 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1997 == Diagnostic::Ignored) 1998 return; 1999 2000 // Build the list of bases and members in the order that they'll 2001 // actually be initialized. The explicit initializers should be in 2002 // this same order but may be missing things. 2003 llvm::SmallVector<const void*, 32> IdealInitKeys; 2004 2005 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2006 2007 // 1. Virtual bases. 2008 for (CXXRecordDecl::base_class_const_iterator VBase = 2009 ClassDecl->vbases_begin(), 2010 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2011 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2012 2013 // 2. Non-virtual bases. 2014 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2015 E = ClassDecl->bases_end(); Base != E; ++Base) { 2016 if (Base->isVirtual()) 2017 continue; 2018 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2019 } 2020 2021 // 3. Direct fields. 2022 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2023 E = ClassDecl->field_end(); Field != E; ++Field) 2024 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2025 2026 unsigned NumIdealInits = IdealInitKeys.size(); 2027 unsigned IdealIndex = 0; 2028 2029 CXXBaseOrMemberInitializer *PrevInit = 0; 2030 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2031 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2032 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2033 2034 // Scan forward to try to find this initializer in the idealized 2035 // initializers list. 2036 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2037 if (InitKey == IdealInitKeys[IdealIndex]) 2038 break; 2039 2040 // If we didn't find this initializer, it must be because we 2041 // scanned past it on a previous iteration. That can only 2042 // happen if we're out of order; emit a warning. 2043 if (IdealIndex == NumIdealInits && PrevInit) { 2044 Sema::SemaDiagnosticBuilder D = 2045 SemaRef.Diag(PrevInit->getSourceLocation(), 2046 diag::warn_initializer_out_of_order); 2047 2048 if (PrevInit->isAnyMemberInitializer()) 2049 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2050 else 2051 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2052 2053 if (Init->isAnyMemberInitializer()) 2054 D << 0 << Init->getAnyMember()->getDeclName(); 2055 else 2056 D << 1 << Init->getBaseClassInfo()->getType(); 2057 2058 // Move back to the initializer's location in the ideal list. 2059 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2060 if (InitKey == IdealInitKeys[IdealIndex]) 2061 break; 2062 2063 assert(IdealIndex != NumIdealInits && 2064 "initializer not found in initializer list"); 2065 } 2066 2067 PrevInit = Init; 2068 } 2069} 2070 2071namespace { 2072bool CheckRedundantInit(Sema &S, 2073 CXXBaseOrMemberInitializer *Init, 2074 CXXBaseOrMemberInitializer *&PrevInit) { 2075 if (!PrevInit) { 2076 PrevInit = Init; 2077 return false; 2078 } 2079 2080 if (FieldDecl *Field = Init->getMember()) 2081 S.Diag(Init->getSourceLocation(), 2082 diag::err_multiple_mem_initialization) 2083 << Field->getDeclName() 2084 << Init->getSourceRange(); 2085 else { 2086 Type *BaseClass = Init->getBaseClass(); 2087 assert(BaseClass && "neither field nor base"); 2088 S.Diag(Init->getSourceLocation(), 2089 diag::err_multiple_base_initialization) 2090 << QualType(BaseClass, 0) 2091 << Init->getSourceRange(); 2092 } 2093 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2094 << 0 << PrevInit->getSourceRange(); 2095 2096 return true; 2097} 2098 2099typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2100typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2101 2102bool CheckRedundantUnionInit(Sema &S, 2103 CXXBaseOrMemberInitializer *Init, 2104 RedundantUnionMap &Unions) { 2105 FieldDecl *Field = Init->getAnyMember(); 2106 RecordDecl *Parent = Field->getParent(); 2107 if (!Parent->isAnonymousStructOrUnion()) 2108 return false; 2109 2110 NamedDecl *Child = Field; 2111 do { 2112 if (Parent->isUnion()) { 2113 UnionEntry &En = Unions[Parent]; 2114 if (En.first && En.first != Child) { 2115 S.Diag(Init->getSourceLocation(), 2116 diag::err_multiple_mem_union_initialization) 2117 << Field->getDeclName() 2118 << Init->getSourceRange(); 2119 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2120 << 0 << En.second->getSourceRange(); 2121 return true; 2122 } else if (!En.first) { 2123 En.first = Child; 2124 En.second = Init; 2125 } 2126 } 2127 2128 Child = Parent; 2129 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2130 } while (Parent->isAnonymousStructOrUnion()); 2131 2132 return false; 2133} 2134} 2135 2136/// ActOnMemInitializers - Handle the member initializers for a constructor. 2137void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2138 SourceLocation ColonLoc, 2139 MemInitTy **meminits, unsigned NumMemInits, 2140 bool AnyErrors) { 2141 if (!ConstructorDecl) 2142 return; 2143 2144 AdjustDeclIfTemplate(ConstructorDecl); 2145 2146 CXXConstructorDecl *Constructor 2147 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2148 2149 if (!Constructor) { 2150 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2151 return; 2152 } 2153 2154 CXXBaseOrMemberInitializer **MemInits = 2155 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2156 2157 // Mapping for the duplicate initializers check. 2158 // For member initializers, this is keyed with a FieldDecl*. 2159 // For base initializers, this is keyed with a Type*. 2160 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2161 2162 // Mapping for the inconsistent anonymous-union initializers check. 2163 RedundantUnionMap MemberUnions; 2164 2165 bool HadError = false; 2166 for (unsigned i = 0; i < NumMemInits; i++) { 2167 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2168 2169 // Set the source order index. 2170 Init->setSourceOrder(i); 2171 2172 if (Init->isAnyMemberInitializer()) { 2173 FieldDecl *Field = Init->getAnyMember(); 2174 if (CheckRedundantInit(*this, Init, Members[Field]) || 2175 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2176 HadError = true; 2177 } else { 2178 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2179 if (CheckRedundantInit(*this, Init, Members[Key])) 2180 HadError = true; 2181 } 2182 } 2183 2184 if (HadError) 2185 return; 2186 2187 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2188 2189 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2190} 2191 2192void 2193Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2194 CXXRecordDecl *ClassDecl) { 2195 // Ignore dependent contexts. 2196 if (ClassDecl->isDependentContext()) 2197 return; 2198 2199 // FIXME: all the access-control diagnostics are positioned on the 2200 // field/base declaration. That's probably good; that said, the 2201 // user might reasonably want to know why the destructor is being 2202 // emitted, and we currently don't say. 2203 2204 // Non-static data members. 2205 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2206 E = ClassDecl->field_end(); I != E; ++I) { 2207 FieldDecl *Field = *I; 2208 if (Field->isInvalidDecl()) 2209 continue; 2210 QualType FieldType = Context.getBaseElementType(Field->getType()); 2211 2212 const RecordType* RT = FieldType->getAs<RecordType>(); 2213 if (!RT) 2214 continue; 2215 2216 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2217 if (FieldClassDecl->hasTrivialDestructor()) 2218 continue; 2219 2220 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2221 CheckDestructorAccess(Field->getLocation(), Dtor, 2222 PDiag(diag::err_access_dtor_field) 2223 << Field->getDeclName() 2224 << FieldType); 2225 2226 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2227 } 2228 2229 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2230 2231 // Bases. 2232 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2233 E = ClassDecl->bases_end(); Base != E; ++Base) { 2234 // Bases are always records in a well-formed non-dependent class. 2235 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2236 2237 // Remember direct virtual bases. 2238 if (Base->isVirtual()) 2239 DirectVirtualBases.insert(RT); 2240 2241 // Ignore trivial destructors. 2242 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2243 if (BaseClassDecl->hasTrivialDestructor()) 2244 continue; 2245 2246 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2247 2248 // FIXME: caret should be on the start of the class name 2249 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2250 PDiag(diag::err_access_dtor_base) 2251 << Base->getType() 2252 << Base->getSourceRange()); 2253 2254 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2255 } 2256 2257 // Virtual bases. 2258 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2259 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2260 2261 // Bases are always records in a well-formed non-dependent class. 2262 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2263 2264 // Ignore direct virtual bases. 2265 if (DirectVirtualBases.count(RT)) 2266 continue; 2267 2268 // Ignore trivial destructors. 2269 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2270 if (BaseClassDecl->hasTrivialDestructor()) 2271 continue; 2272 2273 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2274 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2275 PDiag(diag::err_access_dtor_vbase) 2276 << VBase->getType()); 2277 2278 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2279 } 2280} 2281 2282void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2283 if (!CDtorDecl) 2284 return; 2285 2286 if (CXXConstructorDecl *Constructor 2287 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2288 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2289} 2290 2291bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2292 unsigned DiagID, AbstractDiagSelID SelID) { 2293 if (SelID == -1) 2294 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2295 else 2296 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2297} 2298 2299bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2300 const PartialDiagnostic &PD) { 2301 if (!getLangOptions().CPlusPlus) 2302 return false; 2303 2304 if (const ArrayType *AT = Context.getAsArrayType(T)) 2305 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2306 2307 if (const PointerType *PT = T->getAs<PointerType>()) { 2308 // Find the innermost pointer type. 2309 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2310 PT = T; 2311 2312 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2313 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2314 } 2315 2316 const RecordType *RT = T->getAs<RecordType>(); 2317 if (!RT) 2318 return false; 2319 2320 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2321 2322 // We can't answer whether something is abstract until it has a 2323 // definition. If it's currently being defined, we'll walk back 2324 // over all the declarations when we have a full definition. 2325 const CXXRecordDecl *Def = RD->getDefinition(); 2326 if (!Def || Def->isBeingDefined()) 2327 return false; 2328 2329 if (!RD->isAbstract()) 2330 return false; 2331 2332 Diag(Loc, PD) << RD->getDeclName(); 2333 DiagnoseAbstractType(RD); 2334 2335 return true; 2336} 2337 2338void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2339 // Check if we've already emitted the list of pure virtual functions 2340 // for this class. 2341 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2342 return; 2343 2344 CXXFinalOverriderMap FinalOverriders; 2345 RD->getFinalOverriders(FinalOverriders); 2346 2347 // Keep a set of seen pure methods so we won't diagnose the same method 2348 // more than once. 2349 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2350 2351 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2352 MEnd = FinalOverriders.end(); 2353 M != MEnd; 2354 ++M) { 2355 for (OverridingMethods::iterator SO = M->second.begin(), 2356 SOEnd = M->second.end(); 2357 SO != SOEnd; ++SO) { 2358 // C++ [class.abstract]p4: 2359 // A class is abstract if it contains or inherits at least one 2360 // pure virtual function for which the final overrider is pure 2361 // virtual. 2362 2363 // 2364 if (SO->second.size() != 1) 2365 continue; 2366 2367 if (!SO->second.front().Method->isPure()) 2368 continue; 2369 2370 if (!SeenPureMethods.insert(SO->second.front().Method)) 2371 continue; 2372 2373 Diag(SO->second.front().Method->getLocation(), 2374 diag::note_pure_virtual_function) 2375 << SO->second.front().Method->getDeclName(); 2376 } 2377 } 2378 2379 if (!PureVirtualClassDiagSet) 2380 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2381 PureVirtualClassDiagSet->insert(RD); 2382} 2383 2384namespace { 2385struct AbstractUsageInfo { 2386 Sema &S; 2387 CXXRecordDecl *Record; 2388 CanQualType AbstractType; 2389 bool Invalid; 2390 2391 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2392 : S(S), Record(Record), 2393 AbstractType(S.Context.getCanonicalType( 2394 S.Context.getTypeDeclType(Record))), 2395 Invalid(false) {} 2396 2397 void DiagnoseAbstractType() { 2398 if (Invalid) return; 2399 S.DiagnoseAbstractType(Record); 2400 Invalid = true; 2401 } 2402 2403 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2404}; 2405 2406struct CheckAbstractUsage { 2407 AbstractUsageInfo &Info; 2408 const NamedDecl *Ctx; 2409 2410 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2411 : Info(Info), Ctx(Ctx) {} 2412 2413 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2414 switch (TL.getTypeLocClass()) { 2415#define ABSTRACT_TYPELOC(CLASS, PARENT) 2416#define TYPELOC(CLASS, PARENT) \ 2417 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2418#include "clang/AST/TypeLocNodes.def" 2419 } 2420 } 2421 2422 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2423 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2424 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2425 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2426 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2427 } 2428 } 2429 2430 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2431 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2432 } 2433 2434 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2435 // Visit the type parameters from a permissive context. 2436 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2437 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2438 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2439 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2440 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2441 // TODO: other template argument types? 2442 } 2443 } 2444 2445 // Visit pointee types from a permissive context. 2446#define CheckPolymorphic(Type) \ 2447 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2448 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2449 } 2450 CheckPolymorphic(PointerTypeLoc) 2451 CheckPolymorphic(ReferenceTypeLoc) 2452 CheckPolymorphic(MemberPointerTypeLoc) 2453 CheckPolymorphic(BlockPointerTypeLoc) 2454 2455 /// Handle all the types we haven't given a more specific 2456 /// implementation for above. 2457 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2458 // Every other kind of type that we haven't called out already 2459 // that has an inner type is either (1) sugar or (2) contains that 2460 // inner type in some way as a subobject. 2461 if (TypeLoc Next = TL.getNextTypeLoc()) 2462 return Visit(Next, Sel); 2463 2464 // If there's no inner type and we're in a permissive context, 2465 // don't diagnose. 2466 if (Sel == Sema::AbstractNone) return; 2467 2468 // Check whether the type matches the abstract type. 2469 QualType T = TL.getType(); 2470 if (T->isArrayType()) { 2471 Sel = Sema::AbstractArrayType; 2472 T = Info.S.Context.getBaseElementType(T); 2473 } 2474 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2475 if (CT != Info.AbstractType) return; 2476 2477 // It matched; do some magic. 2478 if (Sel == Sema::AbstractArrayType) { 2479 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2480 << T << TL.getSourceRange(); 2481 } else { 2482 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2483 << Sel << T << TL.getSourceRange(); 2484 } 2485 Info.DiagnoseAbstractType(); 2486 } 2487}; 2488 2489void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2490 Sema::AbstractDiagSelID Sel) { 2491 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2492} 2493 2494} 2495 2496/// Check for invalid uses of an abstract type in a method declaration. 2497static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2498 CXXMethodDecl *MD) { 2499 // No need to do the check on definitions, which require that 2500 // the return/param types be complete. 2501 if (MD->isThisDeclarationADefinition()) 2502 return; 2503 2504 // For safety's sake, just ignore it if we don't have type source 2505 // information. This should never happen for non-implicit methods, 2506 // but... 2507 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2508 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2509} 2510 2511/// Check for invalid uses of an abstract type within a class definition. 2512static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2513 CXXRecordDecl *RD) { 2514 for (CXXRecordDecl::decl_iterator 2515 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2516 Decl *D = *I; 2517 if (D->isImplicit()) continue; 2518 2519 // Methods and method templates. 2520 if (isa<CXXMethodDecl>(D)) { 2521 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2522 } else if (isa<FunctionTemplateDecl>(D)) { 2523 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2524 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2525 2526 // Fields and static variables. 2527 } else if (isa<FieldDecl>(D)) { 2528 FieldDecl *FD = cast<FieldDecl>(D); 2529 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2530 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2531 } else if (isa<VarDecl>(D)) { 2532 VarDecl *VD = cast<VarDecl>(D); 2533 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2534 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2535 2536 // Nested classes and class templates. 2537 } else if (isa<CXXRecordDecl>(D)) { 2538 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2539 } else if (isa<ClassTemplateDecl>(D)) { 2540 CheckAbstractClassUsage(Info, 2541 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2542 } 2543 } 2544} 2545 2546/// \brief Perform semantic checks on a class definition that has been 2547/// completing, introducing implicitly-declared members, checking for 2548/// abstract types, etc. 2549void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2550 if (!Record) 2551 return; 2552 2553 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2554 AbstractUsageInfo Info(*this, Record); 2555 CheckAbstractClassUsage(Info, Record); 2556 } 2557 2558 // If this is not an aggregate type and has no user-declared constructor, 2559 // complain about any non-static data members of reference or const scalar 2560 // type, since they will never get initializers. 2561 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2562 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2563 bool Complained = false; 2564 for (RecordDecl::field_iterator F = Record->field_begin(), 2565 FEnd = Record->field_end(); 2566 F != FEnd; ++F) { 2567 if (F->getType()->isReferenceType() || 2568 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2569 if (!Complained) { 2570 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2571 << Record->getTagKind() << Record; 2572 Complained = true; 2573 } 2574 2575 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2576 << F->getType()->isReferenceType() 2577 << F->getDeclName(); 2578 } 2579 } 2580 } 2581 2582 if (Record->isDynamicClass()) 2583 DynamicClasses.push_back(Record); 2584 2585 if (Record->getIdentifier()) { 2586 // C++ [class.mem]p13: 2587 // If T is the name of a class, then each of the following shall have a 2588 // name different from T: 2589 // - every member of every anonymous union that is a member of class T. 2590 // 2591 // C++ [class.mem]p14: 2592 // In addition, if class T has a user-declared constructor (12.1), every 2593 // non-static data member of class T shall have a name different from T. 2594 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2595 R.first != R.second; ++R.first) { 2596 NamedDecl *D = *R.first; 2597 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2598 isa<IndirectFieldDecl>(D)) { 2599 Diag(D->getLocation(), diag::err_member_name_of_class) 2600 << D->getDeclName(); 2601 break; 2602 } 2603 } 2604 } 2605} 2606 2607void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2608 Decl *TagDecl, 2609 SourceLocation LBrac, 2610 SourceLocation RBrac, 2611 AttributeList *AttrList) { 2612 if (!TagDecl) 2613 return; 2614 2615 AdjustDeclIfTemplate(TagDecl); 2616 2617 ActOnFields(S, RLoc, TagDecl, 2618 // strict aliasing violation! 2619 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2620 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2621 2622 CheckCompletedCXXClass( 2623 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2624} 2625 2626namespace { 2627 /// \brief Helper class that collects exception specifications for 2628 /// implicitly-declared special member functions. 2629 class ImplicitExceptionSpecification { 2630 ASTContext &Context; 2631 bool AllowsAllExceptions; 2632 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2633 llvm::SmallVector<QualType, 4> Exceptions; 2634 2635 public: 2636 explicit ImplicitExceptionSpecification(ASTContext &Context) 2637 : Context(Context), AllowsAllExceptions(false) { } 2638 2639 /// \brief Whether the special member function should have any 2640 /// exception specification at all. 2641 bool hasExceptionSpecification() const { 2642 return !AllowsAllExceptions; 2643 } 2644 2645 /// \brief Whether the special member function should have a 2646 /// throw(...) exception specification (a Microsoft extension). 2647 bool hasAnyExceptionSpecification() const { 2648 return false; 2649 } 2650 2651 /// \brief The number of exceptions in the exception specification. 2652 unsigned size() const { return Exceptions.size(); } 2653 2654 /// \brief The set of exceptions in the exception specification. 2655 const QualType *data() const { return Exceptions.data(); } 2656 2657 /// \brief Note that 2658 void CalledDecl(CXXMethodDecl *Method) { 2659 // If we already know that we allow all exceptions, do nothing. 2660 if (AllowsAllExceptions || !Method) 2661 return; 2662 2663 const FunctionProtoType *Proto 2664 = Method->getType()->getAs<FunctionProtoType>(); 2665 2666 // If this function can throw any exceptions, make a note of that. 2667 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2668 AllowsAllExceptions = true; 2669 ExceptionsSeen.clear(); 2670 Exceptions.clear(); 2671 return; 2672 } 2673 2674 // Record the exceptions in this function's exception specification. 2675 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2676 EEnd = Proto->exception_end(); 2677 E != EEnd; ++E) 2678 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2679 Exceptions.push_back(*E); 2680 } 2681 }; 2682} 2683 2684 2685/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2686/// special functions, such as the default constructor, copy 2687/// constructor, or destructor, to the given C++ class (C++ 2688/// [special]p1). This routine can only be executed just before the 2689/// definition of the class is complete. 2690void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2691 if (!ClassDecl->hasUserDeclaredConstructor()) 2692 ++ASTContext::NumImplicitDefaultConstructors; 2693 2694 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2695 ++ASTContext::NumImplicitCopyConstructors; 2696 2697 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2698 ++ASTContext::NumImplicitCopyAssignmentOperators; 2699 2700 // If we have a dynamic class, then the copy assignment operator may be 2701 // virtual, so we have to declare it immediately. This ensures that, e.g., 2702 // it shows up in the right place in the vtable and that we diagnose 2703 // problems with the implicit exception specification. 2704 if (ClassDecl->isDynamicClass()) 2705 DeclareImplicitCopyAssignment(ClassDecl); 2706 } 2707 2708 if (!ClassDecl->hasUserDeclaredDestructor()) { 2709 ++ASTContext::NumImplicitDestructors; 2710 2711 // If we have a dynamic class, then the destructor may be virtual, so we 2712 // have to declare the destructor immediately. This ensures that, e.g., it 2713 // shows up in the right place in the vtable and that we diagnose problems 2714 // with the implicit exception specification. 2715 if (ClassDecl->isDynamicClass()) 2716 DeclareImplicitDestructor(ClassDecl); 2717 } 2718} 2719 2720void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2721 if (!D) 2722 return; 2723 2724 TemplateParameterList *Params = 0; 2725 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2726 Params = Template->getTemplateParameters(); 2727 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2728 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2729 Params = PartialSpec->getTemplateParameters(); 2730 else 2731 return; 2732 2733 for (TemplateParameterList::iterator Param = Params->begin(), 2734 ParamEnd = Params->end(); 2735 Param != ParamEnd; ++Param) { 2736 NamedDecl *Named = cast<NamedDecl>(*Param); 2737 if (Named->getDeclName()) { 2738 S->AddDecl(Named); 2739 IdResolver.AddDecl(Named); 2740 } 2741 } 2742} 2743 2744void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2745 if (!RecordD) return; 2746 AdjustDeclIfTemplate(RecordD); 2747 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2748 PushDeclContext(S, Record); 2749} 2750 2751void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2752 if (!RecordD) return; 2753 PopDeclContext(); 2754} 2755 2756/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2757/// parsing a top-level (non-nested) C++ class, and we are now 2758/// parsing those parts of the given Method declaration that could 2759/// not be parsed earlier (C++ [class.mem]p2), such as default 2760/// arguments. This action should enter the scope of the given 2761/// Method declaration as if we had just parsed the qualified method 2762/// name. However, it should not bring the parameters into scope; 2763/// that will be performed by ActOnDelayedCXXMethodParameter. 2764void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2765} 2766 2767/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2768/// C++ method declaration. We're (re-)introducing the given 2769/// function parameter into scope for use in parsing later parts of 2770/// the method declaration. For example, we could see an 2771/// ActOnParamDefaultArgument event for this parameter. 2772void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2773 if (!ParamD) 2774 return; 2775 2776 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2777 2778 // If this parameter has an unparsed default argument, clear it out 2779 // to make way for the parsed default argument. 2780 if (Param->hasUnparsedDefaultArg()) 2781 Param->setDefaultArg(0); 2782 2783 S->AddDecl(Param); 2784 if (Param->getDeclName()) 2785 IdResolver.AddDecl(Param); 2786} 2787 2788/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2789/// processing the delayed method declaration for Method. The method 2790/// declaration is now considered finished. There may be a separate 2791/// ActOnStartOfFunctionDef action later (not necessarily 2792/// immediately!) for this method, if it was also defined inside the 2793/// class body. 2794void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2795 if (!MethodD) 2796 return; 2797 2798 AdjustDeclIfTemplate(MethodD); 2799 2800 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2801 2802 // Now that we have our default arguments, check the constructor 2803 // again. It could produce additional diagnostics or affect whether 2804 // the class has implicitly-declared destructors, among other 2805 // things. 2806 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2807 CheckConstructor(Constructor); 2808 2809 // Check the default arguments, which we may have added. 2810 if (!Method->isInvalidDecl()) 2811 CheckCXXDefaultArguments(Method); 2812} 2813 2814/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2815/// the well-formedness of the constructor declarator @p D with type @p 2816/// R. If there are any errors in the declarator, this routine will 2817/// emit diagnostics and set the invalid bit to true. In any case, the type 2818/// will be updated to reflect a well-formed type for the constructor and 2819/// returned. 2820QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2821 StorageClass &SC) { 2822 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2823 2824 // C++ [class.ctor]p3: 2825 // A constructor shall not be virtual (10.3) or static (9.4). A 2826 // constructor can be invoked for a const, volatile or const 2827 // volatile object. A constructor shall not be declared const, 2828 // volatile, or const volatile (9.3.2). 2829 if (isVirtual) { 2830 if (!D.isInvalidType()) 2831 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2832 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2833 << SourceRange(D.getIdentifierLoc()); 2834 D.setInvalidType(); 2835 } 2836 if (SC == SC_Static) { 2837 if (!D.isInvalidType()) 2838 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2839 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2840 << SourceRange(D.getIdentifierLoc()); 2841 D.setInvalidType(); 2842 SC = SC_None; 2843 } 2844 2845 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2846 if (FTI.TypeQuals != 0) { 2847 if (FTI.TypeQuals & Qualifiers::Const) 2848 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2849 << "const" << SourceRange(D.getIdentifierLoc()); 2850 if (FTI.TypeQuals & Qualifiers::Volatile) 2851 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2852 << "volatile" << SourceRange(D.getIdentifierLoc()); 2853 if (FTI.TypeQuals & Qualifiers::Restrict) 2854 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2855 << "restrict" << SourceRange(D.getIdentifierLoc()); 2856 } 2857 2858 // Rebuild the function type "R" without any type qualifiers (in 2859 // case any of the errors above fired) and with "void" as the 2860 // return type, since constructors don't have return types. 2861 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2862 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2863 Proto->getNumArgs(), 2864 Proto->isVariadic(), 0, 2865 Proto->hasExceptionSpec(), 2866 Proto->hasAnyExceptionSpec(), 2867 Proto->getNumExceptions(), 2868 Proto->exception_begin(), 2869 Proto->getExtInfo()); 2870} 2871 2872/// CheckConstructor - Checks a fully-formed constructor for 2873/// well-formedness, issuing any diagnostics required. Returns true if 2874/// the constructor declarator is invalid. 2875void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2876 CXXRecordDecl *ClassDecl 2877 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2878 if (!ClassDecl) 2879 return Constructor->setInvalidDecl(); 2880 2881 // C++ [class.copy]p3: 2882 // A declaration of a constructor for a class X is ill-formed if 2883 // its first parameter is of type (optionally cv-qualified) X and 2884 // either there are no other parameters or else all other 2885 // parameters have default arguments. 2886 if (!Constructor->isInvalidDecl() && 2887 ((Constructor->getNumParams() == 1) || 2888 (Constructor->getNumParams() > 1 && 2889 Constructor->getParamDecl(1)->hasDefaultArg())) && 2890 Constructor->getTemplateSpecializationKind() 2891 != TSK_ImplicitInstantiation) { 2892 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2893 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2894 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2895 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2896 const char *ConstRef 2897 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2898 : " const &"; 2899 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2900 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2901 2902 // FIXME: Rather that making the constructor invalid, we should endeavor 2903 // to fix the type. 2904 Constructor->setInvalidDecl(); 2905 } 2906 } 2907} 2908 2909/// CheckDestructor - Checks a fully-formed destructor definition for 2910/// well-formedness, issuing any diagnostics required. Returns true 2911/// on error. 2912bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2913 CXXRecordDecl *RD = Destructor->getParent(); 2914 2915 if (Destructor->isVirtual()) { 2916 SourceLocation Loc; 2917 2918 if (!Destructor->isImplicit()) 2919 Loc = Destructor->getLocation(); 2920 else 2921 Loc = RD->getLocation(); 2922 2923 // If we have a virtual destructor, look up the deallocation function 2924 FunctionDecl *OperatorDelete = 0; 2925 DeclarationName Name = 2926 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2927 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2928 return true; 2929 2930 MarkDeclarationReferenced(Loc, OperatorDelete); 2931 2932 Destructor->setOperatorDelete(OperatorDelete); 2933 } 2934 2935 return false; 2936} 2937 2938static inline bool 2939FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2940 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2941 FTI.ArgInfo[0].Param && 2942 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 2943} 2944 2945/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2946/// the well-formednes of the destructor declarator @p D with type @p 2947/// R. If there are any errors in the declarator, this routine will 2948/// emit diagnostics and set the declarator to invalid. Even if this happens, 2949/// will be updated to reflect a well-formed type for the destructor and 2950/// returned. 2951QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2952 StorageClass& SC) { 2953 // C++ [class.dtor]p1: 2954 // [...] A typedef-name that names a class is a class-name 2955 // (7.1.3); however, a typedef-name that names a class shall not 2956 // be used as the identifier in the declarator for a destructor 2957 // declaration. 2958 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2959 if (isa<TypedefType>(DeclaratorType)) 2960 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2961 << DeclaratorType; 2962 2963 // C++ [class.dtor]p2: 2964 // A destructor is used to destroy objects of its class type. A 2965 // destructor takes no parameters, and no return type can be 2966 // specified for it (not even void). The address of a destructor 2967 // shall not be taken. A destructor shall not be static. A 2968 // destructor can be invoked for a const, volatile or const 2969 // volatile object. A destructor shall not be declared const, 2970 // volatile or const volatile (9.3.2). 2971 if (SC == SC_Static) { 2972 if (!D.isInvalidType()) 2973 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2974 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2975 << SourceRange(D.getIdentifierLoc()) 2976 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2977 2978 SC = SC_None; 2979 } 2980 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2981 // Destructors don't have return types, but the parser will 2982 // happily parse something like: 2983 // 2984 // class X { 2985 // float ~X(); 2986 // }; 2987 // 2988 // The return type will be eliminated later. 2989 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2990 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2991 << SourceRange(D.getIdentifierLoc()); 2992 } 2993 2994 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2995 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2996 if (FTI.TypeQuals & Qualifiers::Const) 2997 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2998 << "const" << SourceRange(D.getIdentifierLoc()); 2999 if (FTI.TypeQuals & Qualifiers::Volatile) 3000 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3001 << "volatile" << SourceRange(D.getIdentifierLoc()); 3002 if (FTI.TypeQuals & Qualifiers::Restrict) 3003 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3004 << "restrict" << SourceRange(D.getIdentifierLoc()); 3005 D.setInvalidType(); 3006 } 3007 3008 // Make sure we don't have any parameters. 3009 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3010 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3011 3012 // Delete the parameters. 3013 FTI.freeArgs(); 3014 D.setInvalidType(); 3015 } 3016 3017 // Make sure the destructor isn't variadic. 3018 if (FTI.isVariadic) { 3019 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3020 D.setInvalidType(); 3021 } 3022 3023 // Rebuild the function type "R" without any type qualifiers or 3024 // parameters (in case any of the errors above fired) and with 3025 // "void" as the return type, since destructors don't have return 3026 // types. 3027 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3028 if (!Proto) 3029 return QualType(); 3030 3031 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3032 Proto->hasExceptionSpec(), 3033 Proto->hasAnyExceptionSpec(), 3034 Proto->getNumExceptions(), 3035 Proto->exception_begin(), 3036 Proto->getExtInfo()); 3037} 3038 3039/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3040/// well-formednes of the conversion function declarator @p D with 3041/// type @p R. If there are any errors in the declarator, this routine 3042/// will emit diagnostics and return true. Otherwise, it will return 3043/// false. Either way, the type @p R will be updated to reflect a 3044/// well-formed type for the conversion operator. 3045void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3046 StorageClass& SC) { 3047 // C++ [class.conv.fct]p1: 3048 // Neither parameter types nor return type can be specified. The 3049 // type of a conversion function (8.3.5) is "function taking no 3050 // parameter returning conversion-type-id." 3051 if (SC == SC_Static) { 3052 if (!D.isInvalidType()) 3053 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3054 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3055 << SourceRange(D.getIdentifierLoc()); 3056 D.setInvalidType(); 3057 SC = SC_None; 3058 } 3059 3060 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3061 3062 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3063 // Conversion functions don't have return types, but the parser will 3064 // happily parse something like: 3065 // 3066 // class X { 3067 // float operator bool(); 3068 // }; 3069 // 3070 // The return type will be changed later anyway. 3071 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3072 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3073 << SourceRange(D.getIdentifierLoc()); 3074 D.setInvalidType(); 3075 } 3076 3077 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3078 3079 // Make sure we don't have any parameters. 3080 if (Proto->getNumArgs() > 0) { 3081 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3082 3083 // Delete the parameters. 3084 D.getTypeObject(0).Fun.freeArgs(); 3085 D.setInvalidType(); 3086 } else if (Proto->isVariadic()) { 3087 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3088 D.setInvalidType(); 3089 } 3090 3091 // Diagnose "&operator bool()" and other such nonsense. This 3092 // is actually a gcc extension which we don't support. 3093 if (Proto->getResultType() != ConvType) { 3094 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3095 << Proto->getResultType(); 3096 D.setInvalidType(); 3097 ConvType = Proto->getResultType(); 3098 } 3099 3100 // C++ [class.conv.fct]p4: 3101 // The conversion-type-id shall not represent a function type nor 3102 // an array type. 3103 if (ConvType->isArrayType()) { 3104 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3105 ConvType = Context.getPointerType(ConvType); 3106 D.setInvalidType(); 3107 } else if (ConvType->isFunctionType()) { 3108 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3109 ConvType = Context.getPointerType(ConvType); 3110 D.setInvalidType(); 3111 } 3112 3113 // Rebuild the function type "R" without any parameters (in case any 3114 // of the errors above fired) and with the conversion type as the 3115 // return type. 3116 if (D.isInvalidType()) { 3117 R = Context.getFunctionType(ConvType, 0, 0, false, 3118 Proto->getTypeQuals(), 3119 Proto->hasExceptionSpec(), 3120 Proto->hasAnyExceptionSpec(), 3121 Proto->getNumExceptions(), 3122 Proto->exception_begin(), 3123 Proto->getExtInfo()); 3124 } 3125 3126 // C++0x explicit conversion operators. 3127 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3128 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3129 diag::warn_explicit_conversion_functions) 3130 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3131} 3132 3133/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3134/// the declaration of the given C++ conversion function. This routine 3135/// is responsible for recording the conversion function in the C++ 3136/// class, if possible. 3137Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3138 assert(Conversion && "Expected to receive a conversion function declaration"); 3139 3140 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3141 3142 // Make sure we aren't redeclaring the conversion function. 3143 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3144 3145 // C++ [class.conv.fct]p1: 3146 // [...] A conversion function is never used to convert a 3147 // (possibly cv-qualified) object to the (possibly cv-qualified) 3148 // same object type (or a reference to it), to a (possibly 3149 // cv-qualified) base class of that type (or a reference to it), 3150 // or to (possibly cv-qualified) void. 3151 // FIXME: Suppress this warning if the conversion function ends up being a 3152 // virtual function that overrides a virtual function in a base class. 3153 QualType ClassType 3154 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3155 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3156 ConvType = ConvTypeRef->getPointeeType(); 3157 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3158 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3159 /* Suppress diagnostics for instantiations. */; 3160 else if (ConvType->isRecordType()) { 3161 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3162 if (ConvType == ClassType) 3163 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3164 << ClassType; 3165 else if (IsDerivedFrom(ClassType, ConvType)) 3166 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3167 << ClassType << ConvType; 3168 } else if (ConvType->isVoidType()) { 3169 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3170 << ClassType << ConvType; 3171 } 3172 3173 if (FunctionTemplateDecl *ConversionTemplate 3174 = Conversion->getDescribedFunctionTemplate()) 3175 return ConversionTemplate; 3176 3177 return Conversion; 3178} 3179 3180//===----------------------------------------------------------------------===// 3181// Namespace Handling 3182//===----------------------------------------------------------------------===// 3183 3184 3185 3186/// ActOnStartNamespaceDef - This is called at the start of a namespace 3187/// definition. 3188Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3189 SourceLocation InlineLoc, 3190 SourceLocation IdentLoc, 3191 IdentifierInfo *II, 3192 SourceLocation LBrace, 3193 AttributeList *AttrList) { 3194 // anonymous namespace starts at its left brace 3195 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3196 (II ? IdentLoc : LBrace) , II); 3197 Namespc->setLBracLoc(LBrace); 3198 Namespc->setInline(InlineLoc.isValid()); 3199 3200 Scope *DeclRegionScope = NamespcScope->getParent(); 3201 3202 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3203 3204 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3205 PushVisibilityAttr(attr); 3206 3207 if (II) { 3208 // C++ [namespace.def]p2: 3209 // The identifier in an original-namespace-definition shall not 3210 // have been previously defined in the declarative region in 3211 // which the original-namespace-definition appears. The 3212 // identifier in an original-namespace-definition is the name of 3213 // the namespace. Subsequently in that declarative region, it is 3214 // treated as an original-namespace-name. 3215 // 3216 // Since namespace names are unique in their scope, and we don't 3217 // look through using directives, just 3218 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3219 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3220 3221 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3222 // This is an extended namespace definition. 3223 if (Namespc->isInline() != OrigNS->isInline()) { 3224 // inline-ness must match 3225 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3226 << Namespc->isInline(); 3227 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3228 Namespc->setInvalidDecl(); 3229 // Recover by ignoring the new namespace's inline status. 3230 Namespc->setInline(OrigNS->isInline()); 3231 } 3232 3233 // Attach this namespace decl to the chain of extended namespace 3234 // definitions. 3235 OrigNS->setNextNamespace(Namespc); 3236 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3237 3238 // Remove the previous declaration from the scope. 3239 if (DeclRegionScope->isDeclScope(OrigNS)) { 3240 IdResolver.RemoveDecl(OrigNS); 3241 DeclRegionScope->RemoveDecl(OrigNS); 3242 } 3243 } else if (PrevDecl) { 3244 // This is an invalid name redefinition. 3245 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3246 << Namespc->getDeclName(); 3247 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3248 Namespc->setInvalidDecl(); 3249 // Continue on to push Namespc as current DeclContext and return it. 3250 } else if (II->isStr("std") && 3251 CurContext->getRedeclContext()->isTranslationUnit()) { 3252 // This is the first "real" definition of the namespace "std", so update 3253 // our cache of the "std" namespace to point at this definition. 3254 if (NamespaceDecl *StdNS = getStdNamespace()) { 3255 // We had already defined a dummy namespace "std". Link this new 3256 // namespace definition to the dummy namespace "std". 3257 StdNS->setNextNamespace(Namespc); 3258 StdNS->setLocation(IdentLoc); 3259 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3260 } 3261 3262 // Make our StdNamespace cache point at the first real definition of the 3263 // "std" namespace. 3264 StdNamespace = Namespc; 3265 } 3266 3267 PushOnScopeChains(Namespc, DeclRegionScope); 3268 } else { 3269 // Anonymous namespaces. 3270 assert(Namespc->isAnonymousNamespace()); 3271 3272 // Link the anonymous namespace into its parent. 3273 NamespaceDecl *PrevDecl; 3274 DeclContext *Parent = CurContext->getRedeclContext(); 3275 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3276 PrevDecl = TU->getAnonymousNamespace(); 3277 TU->setAnonymousNamespace(Namespc); 3278 } else { 3279 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3280 PrevDecl = ND->getAnonymousNamespace(); 3281 ND->setAnonymousNamespace(Namespc); 3282 } 3283 3284 // Link the anonymous namespace with its previous declaration. 3285 if (PrevDecl) { 3286 assert(PrevDecl->isAnonymousNamespace()); 3287 assert(!PrevDecl->getNextNamespace()); 3288 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3289 PrevDecl->setNextNamespace(Namespc); 3290 3291 if (Namespc->isInline() != PrevDecl->isInline()) { 3292 // inline-ness must match 3293 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3294 << Namespc->isInline(); 3295 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3296 Namespc->setInvalidDecl(); 3297 // Recover by ignoring the new namespace's inline status. 3298 Namespc->setInline(PrevDecl->isInline()); 3299 } 3300 } 3301 3302 CurContext->addDecl(Namespc); 3303 3304 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3305 // behaves as if it were replaced by 3306 // namespace unique { /* empty body */ } 3307 // using namespace unique; 3308 // namespace unique { namespace-body } 3309 // where all occurrences of 'unique' in a translation unit are 3310 // replaced by the same identifier and this identifier differs 3311 // from all other identifiers in the entire program. 3312 3313 // We just create the namespace with an empty name and then add an 3314 // implicit using declaration, just like the standard suggests. 3315 // 3316 // CodeGen enforces the "universally unique" aspect by giving all 3317 // declarations semantically contained within an anonymous 3318 // namespace internal linkage. 3319 3320 if (!PrevDecl) { 3321 UsingDirectiveDecl* UD 3322 = UsingDirectiveDecl::Create(Context, CurContext, 3323 /* 'using' */ LBrace, 3324 /* 'namespace' */ SourceLocation(), 3325 /* qualifier */ SourceRange(), 3326 /* NNS */ NULL, 3327 /* identifier */ SourceLocation(), 3328 Namespc, 3329 /* Ancestor */ CurContext); 3330 UD->setImplicit(); 3331 CurContext->addDecl(UD); 3332 } 3333 } 3334 3335 // Although we could have an invalid decl (i.e. the namespace name is a 3336 // redefinition), push it as current DeclContext and try to continue parsing. 3337 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3338 // for the namespace has the declarations that showed up in that particular 3339 // namespace definition. 3340 PushDeclContext(NamespcScope, Namespc); 3341 return Namespc; 3342} 3343 3344/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3345/// is a namespace alias, returns the namespace it points to. 3346static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3347 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3348 return AD->getNamespace(); 3349 return dyn_cast_or_null<NamespaceDecl>(D); 3350} 3351 3352/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3353/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3354void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3355 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3356 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3357 Namespc->setRBracLoc(RBrace); 3358 PopDeclContext(); 3359 if (Namespc->hasAttr<VisibilityAttr>()) 3360 PopPragmaVisibility(); 3361} 3362 3363CXXRecordDecl *Sema::getStdBadAlloc() const { 3364 return cast_or_null<CXXRecordDecl>( 3365 StdBadAlloc.get(Context.getExternalSource())); 3366} 3367 3368NamespaceDecl *Sema::getStdNamespace() const { 3369 return cast_or_null<NamespaceDecl>( 3370 StdNamespace.get(Context.getExternalSource())); 3371} 3372 3373/// \brief Retrieve the special "std" namespace, which may require us to 3374/// implicitly define the namespace. 3375NamespaceDecl *Sema::getOrCreateStdNamespace() { 3376 if (!StdNamespace) { 3377 // The "std" namespace has not yet been defined, so build one implicitly. 3378 StdNamespace = NamespaceDecl::Create(Context, 3379 Context.getTranslationUnitDecl(), 3380 SourceLocation(), 3381 &PP.getIdentifierTable().get("std")); 3382 getStdNamespace()->setImplicit(true); 3383 } 3384 3385 return getStdNamespace(); 3386} 3387 3388Decl *Sema::ActOnUsingDirective(Scope *S, 3389 SourceLocation UsingLoc, 3390 SourceLocation NamespcLoc, 3391 CXXScopeSpec &SS, 3392 SourceLocation IdentLoc, 3393 IdentifierInfo *NamespcName, 3394 AttributeList *AttrList) { 3395 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3396 assert(NamespcName && "Invalid NamespcName."); 3397 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3398 3399 // This can only happen along a recovery path. 3400 while (S->getFlags() & Scope::TemplateParamScope) 3401 S = S->getParent(); 3402 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3403 3404 UsingDirectiveDecl *UDir = 0; 3405 NestedNameSpecifier *Qualifier = 0; 3406 if (SS.isSet()) 3407 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3408 3409 // Lookup namespace name. 3410 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3411 LookupParsedName(R, S, &SS); 3412 if (R.isAmbiguous()) 3413 return 0; 3414 3415 if (R.empty()) { 3416 // Allow "using namespace std;" or "using namespace ::std;" even if 3417 // "std" hasn't been defined yet, for GCC compatibility. 3418 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3419 NamespcName->isStr("std")) { 3420 Diag(IdentLoc, diag::ext_using_undefined_std); 3421 R.addDecl(getOrCreateStdNamespace()); 3422 R.resolveKind(); 3423 } 3424 // Otherwise, attempt typo correction. 3425 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3426 CTC_NoKeywords, 0)) { 3427 if (R.getAsSingle<NamespaceDecl>() || 3428 R.getAsSingle<NamespaceAliasDecl>()) { 3429 if (DeclContext *DC = computeDeclContext(SS, false)) 3430 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3431 << NamespcName << DC << Corrected << SS.getRange() 3432 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3433 else 3434 Diag(IdentLoc, diag::err_using_directive_suggest) 3435 << NamespcName << Corrected 3436 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3437 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3438 << Corrected; 3439 3440 NamespcName = Corrected.getAsIdentifierInfo(); 3441 } else { 3442 R.clear(); 3443 R.setLookupName(NamespcName); 3444 } 3445 } 3446 } 3447 3448 if (!R.empty()) { 3449 NamedDecl *Named = R.getFoundDecl(); 3450 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3451 && "expected namespace decl"); 3452 // C++ [namespace.udir]p1: 3453 // A using-directive specifies that the names in the nominated 3454 // namespace can be used in the scope in which the 3455 // using-directive appears after the using-directive. During 3456 // unqualified name lookup (3.4.1), the names appear as if they 3457 // were declared in the nearest enclosing namespace which 3458 // contains both the using-directive and the nominated 3459 // namespace. [Note: in this context, "contains" means "contains 3460 // directly or indirectly". ] 3461 3462 // Find enclosing context containing both using-directive and 3463 // nominated namespace. 3464 NamespaceDecl *NS = getNamespaceDecl(Named); 3465 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3466 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3467 CommonAncestor = CommonAncestor->getParent(); 3468 3469 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3470 SS.getRange(), 3471 (NestedNameSpecifier *)SS.getScopeRep(), 3472 IdentLoc, Named, CommonAncestor); 3473 PushUsingDirective(S, UDir); 3474 } else { 3475 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3476 } 3477 3478 // FIXME: We ignore attributes for now. 3479 return UDir; 3480} 3481 3482void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3483 // If scope has associated entity, then using directive is at namespace 3484 // or translation unit scope. We add UsingDirectiveDecls, into 3485 // it's lookup structure. 3486 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3487 Ctx->addDecl(UDir); 3488 else 3489 // Otherwise it is block-sope. using-directives will affect lookup 3490 // only to the end of scope. 3491 S->PushUsingDirective(UDir); 3492} 3493 3494 3495Decl *Sema::ActOnUsingDeclaration(Scope *S, 3496 AccessSpecifier AS, 3497 bool HasUsingKeyword, 3498 SourceLocation UsingLoc, 3499 CXXScopeSpec &SS, 3500 UnqualifiedId &Name, 3501 AttributeList *AttrList, 3502 bool IsTypeName, 3503 SourceLocation TypenameLoc) { 3504 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3505 3506 switch (Name.getKind()) { 3507 case UnqualifiedId::IK_Identifier: 3508 case UnqualifiedId::IK_OperatorFunctionId: 3509 case UnqualifiedId::IK_LiteralOperatorId: 3510 case UnqualifiedId::IK_ConversionFunctionId: 3511 break; 3512 3513 case UnqualifiedId::IK_ConstructorName: 3514 case UnqualifiedId::IK_ConstructorTemplateId: 3515 // C++0x inherited constructors. 3516 if (getLangOptions().CPlusPlus0x) break; 3517 3518 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3519 << SS.getRange(); 3520 return 0; 3521 3522 case UnqualifiedId::IK_DestructorName: 3523 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3524 << SS.getRange(); 3525 return 0; 3526 3527 case UnqualifiedId::IK_TemplateId: 3528 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3529 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3530 return 0; 3531 } 3532 3533 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3534 DeclarationName TargetName = TargetNameInfo.getName(); 3535 if (!TargetName) 3536 return 0; 3537 3538 // Warn about using declarations. 3539 // TODO: store that the declaration was written without 'using' and 3540 // talk about access decls instead of using decls in the 3541 // diagnostics. 3542 if (!HasUsingKeyword) { 3543 UsingLoc = Name.getSourceRange().getBegin(); 3544 3545 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3546 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3547 } 3548 3549 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3550 TargetNameInfo, AttrList, 3551 /* IsInstantiation */ false, 3552 IsTypeName, TypenameLoc); 3553 if (UD) 3554 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3555 3556 return UD; 3557} 3558 3559/// \brief Determine whether a using declaration considers the given 3560/// declarations as "equivalent", e.g., if they are redeclarations of 3561/// the same entity or are both typedefs of the same type. 3562static bool 3563IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3564 bool &SuppressRedeclaration) { 3565 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3566 SuppressRedeclaration = false; 3567 return true; 3568 } 3569 3570 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3571 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3572 SuppressRedeclaration = true; 3573 return Context.hasSameType(TD1->getUnderlyingType(), 3574 TD2->getUnderlyingType()); 3575 } 3576 3577 return false; 3578} 3579 3580 3581/// Determines whether to create a using shadow decl for a particular 3582/// decl, given the set of decls existing prior to this using lookup. 3583bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3584 const LookupResult &Previous) { 3585 // Diagnose finding a decl which is not from a base class of the 3586 // current class. We do this now because there are cases where this 3587 // function will silently decide not to build a shadow decl, which 3588 // will pre-empt further diagnostics. 3589 // 3590 // We don't need to do this in C++0x because we do the check once on 3591 // the qualifier. 3592 // 3593 // FIXME: diagnose the following if we care enough: 3594 // struct A { int foo; }; 3595 // struct B : A { using A::foo; }; 3596 // template <class T> struct C : A {}; 3597 // template <class T> struct D : C<T> { using B::foo; } // <--- 3598 // This is invalid (during instantiation) in C++03 because B::foo 3599 // resolves to the using decl in B, which is not a base class of D<T>. 3600 // We can't diagnose it immediately because C<T> is an unknown 3601 // specialization. The UsingShadowDecl in D<T> then points directly 3602 // to A::foo, which will look well-formed when we instantiate. 3603 // The right solution is to not collapse the shadow-decl chain. 3604 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3605 DeclContext *OrigDC = Orig->getDeclContext(); 3606 3607 // Handle enums and anonymous structs. 3608 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3609 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3610 while (OrigRec->isAnonymousStructOrUnion()) 3611 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3612 3613 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3614 if (OrigDC == CurContext) { 3615 Diag(Using->getLocation(), 3616 diag::err_using_decl_nested_name_specifier_is_current_class) 3617 << Using->getNestedNameRange(); 3618 Diag(Orig->getLocation(), diag::note_using_decl_target); 3619 return true; 3620 } 3621 3622 Diag(Using->getNestedNameRange().getBegin(), 3623 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3624 << Using->getTargetNestedNameDecl() 3625 << cast<CXXRecordDecl>(CurContext) 3626 << Using->getNestedNameRange(); 3627 Diag(Orig->getLocation(), diag::note_using_decl_target); 3628 return true; 3629 } 3630 } 3631 3632 if (Previous.empty()) return false; 3633 3634 NamedDecl *Target = Orig; 3635 if (isa<UsingShadowDecl>(Target)) 3636 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3637 3638 // If the target happens to be one of the previous declarations, we 3639 // don't have a conflict. 3640 // 3641 // FIXME: but we might be increasing its access, in which case we 3642 // should redeclare it. 3643 NamedDecl *NonTag = 0, *Tag = 0; 3644 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3645 I != E; ++I) { 3646 NamedDecl *D = (*I)->getUnderlyingDecl(); 3647 bool Result; 3648 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3649 return Result; 3650 3651 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3652 } 3653 3654 if (Target->isFunctionOrFunctionTemplate()) { 3655 FunctionDecl *FD; 3656 if (isa<FunctionTemplateDecl>(Target)) 3657 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3658 else 3659 FD = cast<FunctionDecl>(Target); 3660 3661 NamedDecl *OldDecl = 0; 3662 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3663 case Ovl_Overload: 3664 return false; 3665 3666 case Ovl_NonFunction: 3667 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3668 break; 3669 3670 // We found a decl with the exact signature. 3671 case Ovl_Match: 3672 // If we're in a record, we want to hide the target, so we 3673 // return true (without a diagnostic) to tell the caller not to 3674 // build a shadow decl. 3675 if (CurContext->isRecord()) 3676 return true; 3677 3678 // If we're not in a record, this is an error. 3679 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3680 break; 3681 } 3682 3683 Diag(Target->getLocation(), diag::note_using_decl_target); 3684 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3685 return true; 3686 } 3687 3688 // Target is not a function. 3689 3690 if (isa<TagDecl>(Target)) { 3691 // No conflict between a tag and a non-tag. 3692 if (!Tag) return false; 3693 3694 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3695 Diag(Target->getLocation(), diag::note_using_decl_target); 3696 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3697 return true; 3698 } 3699 3700 // No conflict between a tag and a non-tag. 3701 if (!NonTag) return false; 3702 3703 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3704 Diag(Target->getLocation(), diag::note_using_decl_target); 3705 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3706 return true; 3707} 3708 3709/// Builds a shadow declaration corresponding to a 'using' declaration. 3710UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3711 UsingDecl *UD, 3712 NamedDecl *Orig) { 3713 3714 // If we resolved to another shadow declaration, just coalesce them. 3715 NamedDecl *Target = Orig; 3716 if (isa<UsingShadowDecl>(Target)) { 3717 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3718 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3719 } 3720 3721 UsingShadowDecl *Shadow 3722 = UsingShadowDecl::Create(Context, CurContext, 3723 UD->getLocation(), UD, Target); 3724 UD->addShadowDecl(Shadow); 3725 3726 Shadow->setAccess(UD->getAccess()); 3727 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3728 Shadow->setInvalidDecl(); 3729 3730 if (S) 3731 PushOnScopeChains(Shadow, S); 3732 else 3733 CurContext->addDecl(Shadow); 3734 3735 3736 return Shadow; 3737} 3738 3739/// Hides a using shadow declaration. This is required by the current 3740/// using-decl implementation when a resolvable using declaration in a 3741/// class is followed by a declaration which would hide or override 3742/// one or more of the using decl's targets; for example: 3743/// 3744/// struct Base { void foo(int); }; 3745/// struct Derived : Base { 3746/// using Base::foo; 3747/// void foo(int); 3748/// }; 3749/// 3750/// The governing language is C++03 [namespace.udecl]p12: 3751/// 3752/// When a using-declaration brings names from a base class into a 3753/// derived class scope, member functions in the derived class 3754/// override and/or hide member functions with the same name and 3755/// parameter types in a base class (rather than conflicting). 3756/// 3757/// There are two ways to implement this: 3758/// (1) optimistically create shadow decls when they're not hidden 3759/// by existing declarations, or 3760/// (2) don't create any shadow decls (or at least don't make them 3761/// visible) until we've fully parsed/instantiated the class. 3762/// The problem with (1) is that we might have to retroactively remove 3763/// a shadow decl, which requires several O(n) operations because the 3764/// decl structures are (very reasonably) not designed for removal. 3765/// (2) avoids this but is very fiddly and phase-dependent. 3766void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3767 if (Shadow->getDeclName().getNameKind() == 3768 DeclarationName::CXXConversionFunctionName) 3769 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3770 3771 // Remove it from the DeclContext... 3772 Shadow->getDeclContext()->removeDecl(Shadow); 3773 3774 // ...and the scope, if applicable... 3775 if (S) { 3776 S->RemoveDecl(Shadow); 3777 IdResolver.RemoveDecl(Shadow); 3778 } 3779 3780 // ...and the using decl. 3781 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3782 3783 // TODO: complain somehow if Shadow was used. It shouldn't 3784 // be possible for this to happen, because...? 3785} 3786 3787/// Builds a using declaration. 3788/// 3789/// \param IsInstantiation - Whether this call arises from an 3790/// instantiation of an unresolved using declaration. We treat 3791/// the lookup differently for these declarations. 3792NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3793 SourceLocation UsingLoc, 3794 CXXScopeSpec &SS, 3795 const DeclarationNameInfo &NameInfo, 3796 AttributeList *AttrList, 3797 bool IsInstantiation, 3798 bool IsTypeName, 3799 SourceLocation TypenameLoc) { 3800 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3801 SourceLocation IdentLoc = NameInfo.getLoc(); 3802 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3803 3804 // FIXME: We ignore attributes for now. 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 DiagnosticErrorTrap Trap(Diags); 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 DiagnosticErrorTrap Trap(Diags); 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, VK_RValue, Loc).take(); 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, Upper, SizeType, Loc), 4643 BO_NE, S.Context.BoolTy, 4644 VK_RValue, OK_Ordinary, Loc); 4645 4646 // Create the pre-increment of the iteration variable. 4647 Expr *Increment 4648 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 4649 VK_LValue, OK_Ordinary, Loc); 4650 4651 // Subscript the "from" and "to" expressions with the iteration variable. 4652 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4653 IterationVarRef, Loc)); 4654 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4655 IterationVarRef, Loc)); 4656 4657 // Build the copy for an individual element of the array. 4658 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 4659 To, From, CopyingBaseSubobject, 4660 Depth + 1); 4661 if (Copy.isInvalid()) 4662 return StmtError(); 4663 4664 // Construct the loop that copies all elements of this array. 4665 return S.ActOnForStmt(Loc, Loc, InitStmt, 4666 S.MakeFullExpr(Comparison), 4667 0, S.MakeFullExpr(Increment), 4668 Loc, Copy.take()); 4669} 4670 4671/// \brief Determine whether the given class has a copy assignment operator 4672/// that accepts a const-qualified argument. 4673static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4674 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4675 4676 if (!Class->hasDeclaredCopyAssignment()) 4677 S.DeclareImplicitCopyAssignment(Class); 4678 4679 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4680 DeclarationName OpName 4681 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4682 4683 DeclContext::lookup_const_iterator Op, OpEnd; 4684 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4685 // C++ [class.copy]p9: 4686 // A user-declared copy assignment operator is a non-static non-template 4687 // member function of class X with exactly one parameter of type X, X&, 4688 // const X&, volatile X& or const volatile X&. 4689 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4690 if (!Method) 4691 continue; 4692 4693 if (Method->isStatic()) 4694 continue; 4695 if (Method->getPrimaryTemplate()) 4696 continue; 4697 const FunctionProtoType *FnType = 4698 Method->getType()->getAs<FunctionProtoType>(); 4699 assert(FnType && "Overloaded operator has no prototype."); 4700 // Don't assert on this; an invalid decl might have been left in the AST. 4701 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4702 continue; 4703 bool AcceptsConst = true; 4704 QualType ArgType = FnType->getArgType(0); 4705 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4706 ArgType = Ref->getPointeeType(); 4707 // Is it a non-const lvalue reference? 4708 if (!ArgType.isConstQualified()) 4709 AcceptsConst = false; 4710 } 4711 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4712 continue; 4713 4714 // We have a single argument of type cv X or cv X&, i.e. we've found the 4715 // copy assignment operator. Return whether it accepts const arguments. 4716 return AcceptsConst; 4717 } 4718 assert(Class->isInvalidDecl() && 4719 "No copy assignment operator declared in valid code."); 4720 return false; 4721} 4722 4723CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4724 // Note: The following rules are largely analoguous to the copy 4725 // constructor rules. Note that virtual bases are not taken into account 4726 // for determining the argument type of the operator. Note also that 4727 // operators taking an object instead of a reference are allowed. 4728 4729 4730 // C++ [class.copy]p10: 4731 // If the class definition does not explicitly declare a copy 4732 // assignment operator, one is declared implicitly. 4733 // The implicitly-defined copy assignment operator for a class X 4734 // will have the form 4735 // 4736 // X& X::operator=(const X&) 4737 // 4738 // if 4739 bool HasConstCopyAssignment = true; 4740 4741 // -- each direct base class B of X has a copy assignment operator 4742 // whose parameter is of type const B&, const volatile B& or B, 4743 // and 4744 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4745 BaseEnd = ClassDecl->bases_end(); 4746 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4747 assert(!Base->getType()->isDependentType() && 4748 "Cannot generate implicit members for class with dependent bases."); 4749 const CXXRecordDecl *BaseClassDecl 4750 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4751 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4752 } 4753 4754 // -- for all the nonstatic data members of X that are of a class 4755 // type M (or array thereof), each such class type has a copy 4756 // assignment operator whose parameter is of type const M&, 4757 // const volatile M& or M. 4758 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4759 FieldEnd = ClassDecl->field_end(); 4760 HasConstCopyAssignment && Field != FieldEnd; 4761 ++Field) { 4762 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4763 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4764 const CXXRecordDecl *FieldClassDecl 4765 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4766 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4767 } 4768 } 4769 4770 // Otherwise, the implicitly declared copy assignment operator will 4771 // have the form 4772 // 4773 // X& X::operator=(X&) 4774 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4775 QualType RetType = Context.getLValueReferenceType(ArgType); 4776 if (HasConstCopyAssignment) 4777 ArgType = ArgType.withConst(); 4778 ArgType = Context.getLValueReferenceType(ArgType); 4779 4780 // C++ [except.spec]p14: 4781 // An implicitly declared special member function (Clause 12) shall have an 4782 // exception-specification. [...] 4783 ImplicitExceptionSpecification ExceptSpec(Context); 4784 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4785 BaseEnd = ClassDecl->bases_end(); 4786 Base != BaseEnd; ++Base) { 4787 CXXRecordDecl *BaseClassDecl 4788 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4789 4790 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4791 DeclareImplicitCopyAssignment(BaseClassDecl); 4792 4793 if (CXXMethodDecl *CopyAssign 4794 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4795 ExceptSpec.CalledDecl(CopyAssign); 4796 } 4797 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4798 FieldEnd = ClassDecl->field_end(); 4799 Field != FieldEnd; 4800 ++Field) { 4801 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4802 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4803 CXXRecordDecl *FieldClassDecl 4804 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4805 4806 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4807 DeclareImplicitCopyAssignment(FieldClassDecl); 4808 4809 if (CXXMethodDecl *CopyAssign 4810 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4811 ExceptSpec.CalledDecl(CopyAssign); 4812 } 4813 } 4814 4815 // An implicitly-declared copy assignment operator is an inline public 4816 // member of its class. 4817 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4818 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4819 CXXMethodDecl *CopyAssignment 4820 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4821 Context.getFunctionType(RetType, &ArgType, 1, 4822 false, 0, 4823 ExceptSpec.hasExceptionSpecification(), 4824 ExceptSpec.hasAnyExceptionSpecification(), 4825 ExceptSpec.size(), 4826 ExceptSpec.data(), 4827 FunctionType::ExtInfo()), 4828 /*TInfo=*/0, /*isStatic=*/false, 4829 /*StorageClassAsWritten=*/SC_None, 4830 /*isInline=*/true); 4831 CopyAssignment->setAccess(AS_public); 4832 CopyAssignment->setImplicit(); 4833 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4834 4835 // Add the parameter to the operator. 4836 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4837 ClassDecl->getLocation(), 4838 /*Id=*/0, 4839 ArgType, /*TInfo=*/0, 4840 SC_None, 4841 SC_None, 0); 4842 CopyAssignment->setParams(&FromParam, 1); 4843 4844 // Note that we have added this copy-assignment operator. 4845 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4846 4847 if (Scope *S = getScopeForContext(ClassDecl)) 4848 PushOnScopeChains(CopyAssignment, S, false); 4849 ClassDecl->addDecl(CopyAssignment); 4850 4851 AddOverriddenMethods(ClassDecl, CopyAssignment); 4852 return CopyAssignment; 4853} 4854 4855void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4856 CXXMethodDecl *CopyAssignOperator) { 4857 assert((CopyAssignOperator->isImplicit() && 4858 CopyAssignOperator->isOverloadedOperator() && 4859 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4860 !CopyAssignOperator->isUsed(false)) && 4861 "DefineImplicitCopyAssignment called for wrong function"); 4862 4863 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4864 4865 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4866 CopyAssignOperator->setInvalidDecl(); 4867 return; 4868 } 4869 4870 CopyAssignOperator->setUsed(); 4871 4872 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4873 DiagnosticErrorTrap Trap(Diags); 4874 4875 // C++0x [class.copy]p30: 4876 // The implicitly-defined or explicitly-defaulted copy assignment operator 4877 // for a non-union class X performs memberwise copy assignment of its 4878 // subobjects. The direct base classes of X are assigned first, in the 4879 // order of their declaration in the base-specifier-list, and then the 4880 // immediate non-static data members of X are assigned, in the order in 4881 // which they were declared in the class definition. 4882 4883 // The statements that form the synthesized function body. 4884 ASTOwningVector<Stmt*> Statements(*this); 4885 4886 // The parameter for the "other" object, which we are copying from. 4887 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4888 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4889 QualType OtherRefType = Other->getType(); 4890 if (const LValueReferenceType *OtherRef 4891 = OtherRefType->getAs<LValueReferenceType>()) { 4892 OtherRefType = OtherRef->getPointeeType(); 4893 OtherQuals = OtherRefType.getQualifiers(); 4894 } 4895 4896 // Our location for everything implicitly-generated. 4897 SourceLocation Loc = CopyAssignOperator->getLocation(); 4898 4899 // Construct a reference to the "other" object. We'll be using this 4900 // throughout the generated ASTs. 4901 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 4902 assert(OtherRef && "Reference to parameter cannot fail!"); 4903 4904 // Construct the "this" pointer. We'll be using this throughout the generated 4905 // ASTs. 4906 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4907 assert(This && "Reference to this cannot fail!"); 4908 4909 // Assign base classes. 4910 bool Invalid = false; 4911 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4912 E = ClassDecl->bases_end(); Base != E; ++Base) { 4913 // Form the assignment: 4914 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4915 QualType BaseType = Base->getType().getUnqualifiedType(); 4916 CXXRecordDecl *BaseClassDecl = 0; 4917 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4918 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4919 else { 4920 Invalid = true; 4921 continue; 4922 } 4923 4924 CXXCastPath BasePath; 4925 BasePath.push_back(Base); 4926 4927 // Construct the "from" expression, which is an implicit cast to the 4928 // appropriately-qualified base type. 4929 Expr *From = OtherRef; 4930 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4931 CK_UncheckedDerivedToBase, 4932 VK_LValue, &BasePath); 4933 4934 // Dereference "this". 4935 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4936 4937 // Implicitly cast "this" to the appropriately-qualified base type. 4938 Expr *ToE = To.takeAs<Expr>(); 4939 ImpCastExprToType(ToE, 4940 Context.getCVRQualifiedType(BaseType, 4941 CopyAssignOperator->getTypeQualifiers()), 4942 CK_UncheckedDerivedToBase, 4943 VK_LValue, &BasePath); 4944 To = Owned(ToE); 4945 4946 // Build the copy. 4947 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4948 To.get(), From, 4949 /*CopyingBaseSubobject=*/true); 4950 if (Copy.isInvalid()) { 4951 Diag(CurrentLocation, diag::note_member_synthesized_at) 4952 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4953 CopyAssignOperator->setInvalidDecl(); 4954 return; 4955 } 4956 4957 // Success! Record the copy. 4958 Statements.push_back(Copy.takeAs<Expr>()); 4959 } 4960 4961 // \brief Reference to the __builtin_memcpy function. 4962 Expr *BuiltinMemCpyRef = 0; 4963 // \brief Reference to the __builtin_objc_memmove_collectable function. 4964 Expr *CollectableMemCpyRef = 0; 4965 4966 // Assign non-static members. 4967 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4968 FieldEnd = ClassDecl->field_end(); 4969 Field != FieldEnd; ++Field) { 4970 // Check for members of reference type; we can't copy those. 4971 if (Field->getType()->isReferenceType()) { 4972 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4973 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4974 Diag(Field->getLocation(), diag::note_declared_at); 4975 Diag(CurrentLocation, diag::note_member_synthesized_at) 4976 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4977 Invalid = true; 4978 continue; 4979 } 4980 4981 // Check for members of const-qualified, non-class type. 4982 QualType BaseType = Context.getBaseElementType(Field->getType()); 4983 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4984 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4985 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4986 Diag(Field->getLocation(), diag::note_declared_at); 4987 Diag(CurrentLocation, diag::note_member_synthesized_at) 4988 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4989 Invalid = true; 4990 continue; 4991 } 4992 4993 QualType FieldType = Field->getType().getNonReferenceType(); 4994 if (FieldType->isIncompleteArrayType()) { 4995 assert(ClassDecl->hasFlexibleArrayMember() && 4996 "Incomplete array type is not valid"); 4997 continue; 4998 } 4999 5000 // Build references to the field in the object we're copying from and to. 5001 CXXScopeSpec SS; // Intentionally empty 5002 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5003 LookupMemberName); 5004 MemberLookup.addDecl(*Field); 5005 MemberLookup.resolveKind(); 5006 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5007 Loc, /*IsArrow=*/false, 5008 SS, 0, MemberLookup, 0); 5009 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5010 Loc, /*IsArrow=*/true, 5011 SS, 0, MemberLookup, 0); 5012 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5013 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5014 5015 // If the field should be copied with __builtin_memcpy rather than via 5016 // explicit assignments, do so. This optimization only applies for arrays 5017 // of scalars and arrays of class type with trivial copy-assignment 5018 // operators. 5019 if (FieldType->isArrayType() && 5020 (!BaseType->isRecordType() || 5021 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5022 ->hasTrivialCopyAssignment())) { 5023 // Compute the size of the memory buffer to be copied. 5024 QualType SizeType = Context.getSizeType(); 5025 llvm::APInt Size(Context.getTypeSize(SizeType), 5026 Context.getTypeSizeInChars(BaseType).getQuantity()); 5027 for (const ConstantArrayType *Array 5028 = Context.getAsConstantArrayType(FieldType); 5029 Array; 5030 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5031 llvm::APInt ArraySize = Array->getSize(); 5032 ArraySize.zextOrTrunc(Size.getBitWidth()); 5033 Size *= ArraySize; 5034 } 5035 5036 // Take the address of the field references for "from" and "to". 5037 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5038 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5039 5040 bool NeedsCollectableMemCpy = 5041 (BaseType->isRecordType() && 5042 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5043 5044 if (NeedsCollectableMemCpy) { 5045 if (!CollectableMemCpyRef) { 5046 // Create a reference to the __builtin_objc_memmove_collectable function. 5047 LookupResult R(*this, 5048 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5049 Loc, LookupOrdinaryName); 5050 LookupName(R, TUScope, true); 5051 5052 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5053 if (!CollectableMemCpy) { 5054 // Something went horribly wrong earlier, and we will have 5055 // complained about it. 5056 Invalid = true; 5057 continue; 5058 } 5059 5060 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5061 CollectableMemCpy->getType(), 5062 VK_LValue, Loc, 0).take(); 5063 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5064 } 5065 } 5066 // Create a reference to the __builtin_memcpy builtin function. 5067 else if (!BuiltinMemCpyRef) { 5068 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5069 LookupOrdinaryName); 5070 LookupName(R, TUScope, true); 5071 5072 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5073 if (!BuiltinMemCpy) { 5074 // Something went horribly wrong earlier, and we will have complained 5075 // about it. 5076 Invalid = true; 5077 continue; 5078 } 5079 5080 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5081 BuiltinMemCpy->getType(), 5082 VK_LValue, Loc, 0).take(); 5083 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5084 } 5085 5086 ASTOwningVector<Expr*> CallArgs(*this); 5087 CallArgs.push_back(To.takeAs<Expr>()); 5088 CallArgs.push_back(From.takeAs<Expr>()); 5089 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5090 ExprResult Call = ExprError(); 5091 if (NeedsCollectableMemCpy) 5092 Call = ActOnCallExpr(/*Scope=*/0, 5093 CollectableMemCpyRef, 5094 Loc, move_arg(CallArgs), 5095 Loc); 5096 else 5097 Call = ActOnCallExpr(/*Scope=*/0, 5098 BuiltinMemCpyRef, 5099 Loc, move_arg(CallArgs), 5100 Loc); 5101 5102 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5103 Statements.push_back(Call.takeAs<Expr>()); 5104 continue; 5105 } 5106 5107 // Build the copy of this field. 5108 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5109 To.get(), From.get(), 5110 /*CopyingBaseSubobject=*/false); 5111 if (Copy.isInvalid()) { 5112 Diag(CurrentLocation, diag::note_member_synthesized_at) 5113 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5114 CopyAssignOperator->setInvalidDecl(); 5115 return; 5116 } 5117 5118 // Success! Record the copy. 5119 Statements.push_back(Copy.takeAs<Stmt>()); 5120 } 5121 5122 if (!Invalid) { 5123 // Add a "return *this;" 5124 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5125 5126 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5127 if (Return.isInvalid()) 5128 Invalid = true; 5129 else { 5130 Statements.push_back(Return.takeAs<Stmt>()); 5131 5132 if (Trap.hasErrorOccurred()) { 5133 Diag(CurrentLocation, diag::note_member_synthesized_at) 5134 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5135 Invalid = true; 5136 } 5137 } 5138 } 5139 5140 if (Invalid) { 5141 CopyAssignOperator->setInvalidDecl(); 5142 return; 5143 } 5144 5145 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5146 /*isStmtExpr=*/false); 5147 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5148 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5149} 5150 5151CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5152 CXXRecordDecl *ClassDecl) { 5153 // C++ [class.copy]p4: 5154 // If the class definition does not explicitly declare a copy 5155 // constructor, one is declared implicitly. 5156 5157 // C++ [class.copy]p5: 5158 // The implicitly-declared copy constructor for a class X will 5159 // have the form 5160 // 5161 // X::X(const X&) 5162 // 5163 // if 5164 bool HasConstCopyConstructor = true; 5165 5166 // -- each direct or virtual base class B of X has a copy 5167 // constructor whose first parameter is of type const B& or 5168 // const volatile B&, and 5169 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5170 BaseEnd = ClassDecl->bases_end(); 5171 HasConstCopyConstructor && Base != BaseEnd; 5172 ++Base) { 5173 // Virtual bases are handled below. 5174 if (Base->isVirtual()) 5175 continue; 5176 5177 CXXRecordDecl *BaseClassDecl 5178 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5179 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5180 DeclareImplicitCopyConstructor(BaseClassDecl); 5181 5182 HasConstCopyConstructor 5183 = BaseClassDecl->hasConstCopyConstructor(Context); 5184 } 5185 5186 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5187 BaseEnd = ClassDecl->vbases_end(); 5188 HasConstCopyConstructor && Base != BaseEnd; 5189 ++Base) { 5190 CXXRecordDecl *BaseClassDecl 5191 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5192 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5193 DeclareImplicitCopyConstructor(BaseClassDecl); 5194 5195 HasConstCopyConstructor 5196 = BaseClassDecl->hasConstCopyConstructor(Context); 5197 } 5198 5199 // -- for all the nonstatic data members of X that are of a 5200 // class type M (or array thereof), each such class type 5201 // has a copy constructor whose first parameter is of type 5202 // const M& or const volatile M&. 5203 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5204 FieldEnd = ClassDecl->field_end(); 5205 HasConstCopyConstructor && Field != FieldEnd; 5206 ++Field) { 5207 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5208 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5209 CXXRecordDecl *FieldClassDecl 5210 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5211 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5212 DeclareImplicitCopyConstructor(FieldClassDecl); 5213 5214 HasConstCopyConstructor 5215 = FieldClassDecl->hasConstCopyConstructor(Context); 5216 } 5217 } 5218 5219 // Otherwise, the implicitly declared copy constructor will have 5220 // the form 5221 // 5222 // X::X(X&) 5223 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5224 QualType ArgType = ClassType; 5225 if (HasConstCopyConstructor) 5226 ArgType = ArgType.withConst(); 5227 ArgType = Context.getLValueReferenceType(ArgType); 5228 5229 // C++ [except.spec]p14: 5230 // An implicitly declared special member function (Clause 12) shall have an 5231 // exception-specification. [...] 5232 ImplicitExceptionSpecification ExceptSpec(Context); 5233 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5234 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5235 BaseEnd = ClassDecl->bases_end(); 5236 Base != BaseEnd; 5237 ++Base) { 5238 // Virtual bases are handled below. 5239 if (Base->isVirtual()) 5240 continue; 5241 5242 CXXRecordDecl *BaseClassDecl 5243 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5244 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5245 DeclareImplicitCopyConstructor(BaseClassDecl); 5246 5247 if (CXXConstructorDecl *CopyConstructor 5248 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5249 ExceptSpec.CalledDecl(CopyConstructor); 5250 } 5251 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5252 BaseEnd = ClassDecl->vbases_end(); 5253 Base != BaseEnd; 5254 ++Base) { 5255 CXXRecordDecl *BaseClassDecl 5256 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5257 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5258 DeclareImplicitCopyConstructor(BaseClassDecl); 5259 5260 if (CXXConstructorDecl *CopyConstructor 5261 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5262 ExceptSpec.CalledDecl(CopyConstructor); 5263 } 5264 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5265 FieldEnd = ClassDecl->field_end(); 5266 Field != FieldEnd; 5267 ++Field) { 5268 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5269 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5270 CXXRecordDecl *FieldClassDecl 5271 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5272 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5273 DeclareImplicitCopyConstructor(FieldClassDecl); 5274 5275 if (CXXConstructorDecl *CopyConstructor 5276 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5277 ExceptSpec.CalledDecl(CopyConstructor); 5278 } 5279 } 5280 5281 // An implicitly-declared copy constructor is an inline public 5282 // member of its class. 5283 DeclarationName Name 5284 = Context.DeclarationNames.getCXXConstructorName( 5285 Context.getCanonicalType(ClassType)); 5286 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5287 CXXConstructorDecl *CopyConstructor 5288 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5289 Context.getFunctionType(Context.VoidTy, 5290 &ArgType, 1, 5291 false, 0, 5292 ExceptSpec.hasExceptionSpecification(), 5293 ExceptSpec.hasAnyExceptionSpecification(), 5294 ExceptSpec.size(), 5295 ExceptSpec.data(), 5296 FunctionType::ExtInfo()), 5297 /*TInfo=*/0, 5298 /*isExplicit=*/false, 5299 /*isInline=*/true, 5300 /*isImplicitlyDeclared=*/true); 5301 CopyConstructor->setAccess(AS_public); 5302 CopyConstructor->setImplicit(); 5303 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5304 5305 // Note that we have declared this constructor. 5306 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5307 5308 // Add the parameter to the constructor. 5309 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5310 ClassDecl->getLocation(), 5311 /*IdentifierInfo=*/0, 5312 ArgType, /*TInfo=*/0, 5313 SC_None, 5314 SC_None, 0); 5315 CopyConstructor->setParams(&FromParam, 1); 5316 if (Scope *S = getScopeForContext(ClassDecl)) 5317 PushOnScopeChains(CopyConstructor, S, false); 5318 ClassDecl->addDecl(CopyConstructor); 5319 5320 return CopyConstructor; 5321} 5322 5323void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5324 CXXConstructorDecl *CopyConstructor, 5325 unsigned TypeQuals) { 5326 assert((CopyConstructor->isImplicit() && 5327 CopyConstructor->isCopyConstructor(TypeQuals) && 5328 !CopyConstructor->isUsed(false)) && 5329 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5330 5331 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5332 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5333 5334 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5335 DiagnosticErrorTrap Trap(Diags); 5336 5337 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5338 Trap.hasErrorOccurred()) { 5339 Diag(CurrentLocation, diag::note_member_synthesized_at) 5340 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5341 CopyConstructor->setInvalidDecl(); 5342 } else { 5343 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5344 CopyConstructor->getLocation(), 5345 MultiStmtArg(*this, 0, 0), 5346 /*isStmtExpr=*/false) 5347 .takeAs<Stmt>()); 5348 } 5349 5350 CopyConstructor->setUsed(); 5351} 5352 5353ExprResult 5354Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5355 CXXConstructorDecl *Constructor, 5356 MultiExprArg ExprArgs, 5357 bool RequiresZeroInit, 5358 unsigned ConstructKind, 5359 SourceRange ParenRange) { 5360 bool Elidable = false; 5361 5362 // C++0x [class.copy]p34: 5363 // When certain criteria are met, an implementation is allowed to 5364 // omit the copy/move construction of a class object, even if the 5365 // copy/move constructor and/or destructor for the object have 5366 // side effects. [...] 5367 // - when a temporary class object that has not been bound to a 5368 // reference (12.2) would be copied/moved to a class object 5369 // with the same cv-unqualified type, the copy/move operation 5370 // can be omitted by constructing the temporary object 5371 // directly into the target of the omitted copy/move 5372 if (ConstructKind == CXXConstructExpr::CK_Complete && 5373 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5374 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5375 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5376 } 5377 5378 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5379 Elidable, move(ExprArgs), RequiresZeroInit, 5380 ConstructKind, ParenRange); 5381} 5382 5383/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5384/// including handling of its default argument expressions. 5385ExprResult 5386Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5387 CXXConstructorDecl *Constructor, bool Elidable, 5388 MultiExprArg ExprArgs, 5389 bool RequiresZeroInit, 5390 unsigned ConstructKind, 5391 SourceRange ParenRange) { 5392 unsigned NumExprs = ExprArgs.size(); 5393 Expr **Exprs = (Expr **)ExprArgs.release(); 5394 5395 MarkDeclarationReferenced(ConstructLoc, Constructor); 5396 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5397 Constructor, Elidable, Exprs, NumExprs, 5398 RequiresZeroInit, 5399 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5400 ParenRange)); 5401} 5402 5403bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5404 CXXConstructorDecl *Constructor, 5405 MultiExprArg Exprs) { 5406 // FIXME: Provide the correct paren SourceRange when available. 5407 ExprResult TempResult = 5408 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5409 move(Exprs), false, CXXConstructExpr::CK_Complete, 5410 SourceRange()); 5411 if (TempResult.isInvalid()) 5412 return true; 5413 5414 Expr *Temp = TempResult.takeAs<Expr>(); 5415 CheckImplicitConversions(Temp, VD->getLocation()); 5416 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5417 Temp = MaybeCreateExprWithCleanups(Temp); 5418 VD->setInit(Temp); 5419 5420 return false; 5421} 5422 5423void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5424 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5425 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5426 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5427 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5428 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5429 CheckDestructorAccess(VD->getLocation(), Destructor, 5430 PDiag(diag::err_access_dtor_var) 5431 << VD->getDeclName() 5432 << VD->getType()); 5433 5434 // TODO: this should be re-enabled for static locals by !CXAAtExit 5435 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5436 Diag(VD->getLocation(), diag::warn_global_destructor); 5437 } 5438} 5439 5440/// AddCXXDirectInitializerToDecl - This action is called immediately after 5441/// ActOnDeclarator, when a C++ direct initializer is present. 5442/// e.g: "int x(1);" 5443void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5444 SourceLocation LParenLoc, 5445 MultiExprArg Exprs, 5446 SourceLocation RParenLoc) { 5447 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5448 5449 // If there is no declaration, there was an error parsing it. Just ignore 5450 // the initializer. 5451 if (RealDecl == 0) 5452 return; 5453 5454 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5455 if (!VDecl) { 5456 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5457 RealDecl->setInvalidDecl(); 5458 return; 5459 } 5460 5461 // We will represent direct-initialization similarly to copy-initialization: 5462 // int x(1); -as-> int x = 1; 5463 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5464 // 5465 // Clients that want to distinguish between the two forms, can check for 5466 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5467 // A major benefit is that clients that don't particularly care about which 5468 // exactly form was it (like the CodeGen) can handle both cases without 5469 // special case code. 5470 5471 // C++ 8.5p11: 5472 // The form of initialization (using parentheses or '=') is generally 5473 // insignificant, but does matter when the entity being initialized has a 5474 // class type. 5475 5476 if (!VDecl->getType()->isDependentType() && 5477 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5478 diag::err_typecheck_decl_incomplete_type)) { 5479 VDecl->setInvalidDecl(); 5480 return; 5481 } 5482 5483 // The variable can not have an abstract class type. 5484 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5485 diag::err_abstract_type_in_decl, 5486 AbstractVariableType)) 5487 VDecl->setInvalidDecl(); 5488 5489 const VarDecl *Def; 5490 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5491 Diag(VDecl->getLocation(), diag::err_redefinition) 5492 << VDecl->getDeclName(); 5493 Diag(Def->getLocation(), diag::note_previous_definition); 5494 VDecl->setInvalidDecl(); 5495 return; 5496 } 5497 5498 // C++ [class.static.data]p4 5499 // If a static data member is of const integral or const 5500 // enumeration type, its declaration in the class definition can 5501 // specify a constant-initializer which shall be an integral 5502 // constant expression (5.19). In that case, the member can appear 5503 // in integral constant expressions. The member shall still be 5504 // defined in a namespace scope if it is used in the program and the 5505 // namespace scope definition shall not contain an initializer. 5506 // 5507 // We already performed a redefinition check above, but for static 5508 // data members we also need to check whether there was an in-class 5509 // declaration with an initializer. 5510 const VarDecl* PrevInit = 0; 5511 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5512 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5513 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5514 return; 5515 } 5516 5517 // If either the declaration has a dependent type or if any of the 5518 // expressions is type-dependent, we represent the initialization 5519 // via a ParenListExpr for later use during template instantiation. 5520 if (VDecl->getType()->isDependentType() || 5521 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5522 // Let clients know that initialization was done with a direct initializer. 5523 VDecl->setCXXDirectInitializer(true); 5524 5525 // Store the initialization expressions as a ParenListExpr. 5526 unsigned NumExprs = Exprs.size(); 5527 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5528 (Expr **)Exprs.release(), 5529 NumExprs, RParenLoc)); 5530 return; 5531 } 5532 5533 // Capture the variable that is being initialized and the style of 5534 // initialization. 5535 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5536 5537 // FIXME: Poor source location information. 5538 InitializationKind Kind 5539 = InitializationKind::CreateDirect(VDecl->getLocation(), 5540 LParenLoc, RParenLoc); 5541 5542 InitializationSequence InitSeq(*this, Entity, Kind, 5543 Exprs.get(), Exprs.size()); 5544 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5545 if (Result.isInvalid()) { 5546 VDecl->setInvalidDecl(); 5547 return; 5548 } 5549 5550 CheckImplicitConversions(Result.get(), LParenLoc); 5551 5552 Result = MaybeCreateExprWithCleanups(Result.get()); 5553 VDecl->setInit(Result.takeAs<Expr>()); 5554 VDecl->setCXXDirectInitializer(true); 5555 5556 if (!VDecl->isInvalidDecl() && 5557 !VDecl->getDeclContext()->isDependentContext() && 5558 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5559 !VDecl->getInit()->isConstantInitializer(Context, 5560 VDecl->getType()->isReferenceType())) 5561 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5562 << VDecl->getInit()->getSourceRange(); 5563 5564 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5565 FinalizeVarWithDestructor(VDecl, Record); 5566} 5567 5568/// \brief Given a constructor and the set of arguments provided for the 5569/// constructor, convert the arguments and add any required default arguments 5570/// to form a proper call to this constructor. 5571/// 5572/// \returns true if an error occurred, false otherwise. 5573bool 5574Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5575 MultiExprArg ArgsPtr, 5576 SourceLocation Loc, 5577 ASTOwningVector<Expr*> &ConvertedArgs) { 5578 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5579 unsigned NumArgs = ArgsPtr.size(); 5580 Expr **Args = (Expr **)ArgsPtr.get(); 5581 5582 const FunctionProtoType *Proto 5583 = Constructor->getType()->getAs<FunctionProtoType>(); 5584 assert(Proto && "Constructor without a prototype?"); 5585 unsigned NumArgsInProto = Proto->getNumArgs(); 5586 5587 // If too few arguments are available, we'll fill in the rest with defaults. 5588 if (NumArgs < NumArgsInProto) 5589 ConvertedArgs.reserve(NumArgsInProto); 5590 else 5591 ConvertedArgs.reserve(NumArgs); 5592 5593 VariadicCallType CallType = 5594 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5595 llvm::SmallVector<Expr *, 8> AllArgs; 5596 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5597 Proto, 0, Args, NumArgs, AllArgs, 5598 CallType); 5599 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5600 ConvertedArgs.push_back(AllArgs[i]); 5601 return Invalid; 5602} 5603 5604static inline bool 5605CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5606 const FunctionDecl *FnDecl) { 5607 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5608 if (isa<NamespaceDecl>(DC)) { 5609 return SemaRef.Diag(FnDecl->getLocation(), 5610 diag::err_operator_new_delete_declared_in_namespace) 5611 << FnDecl->getDeclName(); 5612 } 5613 5614 if (isa<TranslationUnitDecl>(DC) && 5615 FnDecl->getStorageClass() == SC_Static) { 5616 return SemaRef.Diag(FnDecl->getLocation(), 5617 diag::err_operator_new_delete_declared_static) 5618 << FnDecl->getDeclName(); 5619 } 5620 5621 return false; 5622} 5623 5624static inline bool 5625CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5626 CanQualType ExpectedResultType, 5627 CanQualType ExpectedFirstParamType, 5628 unsigned DependentParamTypeDiag, 5629 unsigned InvalidParamTypeDiag) { 5630 QualType ResultType = 5631 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5632 5633 // Check that the result type is not dependent. 5634 if (ResultType->isDependentType()) 5635 return SemaRef.Diag(FnDecl->getLocation(), 5636 diag::err_operator_new_delete_dependent_result_type) 5637 << FnDecl->getDeclName() << ExpectedResultType; 5638 5639 // Check that the result type is what we expect. 5640 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5641 return SemaRef.Diag(FnDecl->getLocation(), 5642 diag::err_operator_new_delete_invalid_result_type) 5643 << FnDecl->getDeclName() << ExpectedResultType; 5644 5645 // A function template must have at least 2 parameters. 5646 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5647 return SemaRef.Diag(FnDecl->getLocation(), 5648 diag::err_operator_new_delete_template_too_few_parameters) 5649 << FnDecl->getDeclName(); 5650 5651 // The function decl must have at least 1 parameter. 5652 if (FnDecl->getNumParams() == 0) 5653 return SemaRef.Diag(FnDecl->getLocation(), 5654 diag::err_operator_new_delete_too_few_parameters) 5655 << FnDecl->getDeclName(); 5656 5657 // Check the the first parameter type is not dependent. 5658 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5659 if (FirstParamType->isDependentType()) 5660 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5661 << FnDecl->getDeclName() << ExpectedFirstParamType; 5662 5663 // Check that the first parameter type is what we expect. 5664 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5665 ExpectedFirstParamType) 5666 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5667 << FnDecl->getDeclName() << ExpectedFirstParamType; 5668 5669 return false; 5670} 5671 5672static bool 5673CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5674 // C++ [basic.stc.dynamic.allocation]p1: 5675 // A program is ill-formed if an allocation function is declared in a 5676 // namespace scope other than global scope or declared static in global 5677 // scope. 5678 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5679 return true; 5680 5681 CanQualType SizeTy = 5682 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5683 5684 // C++ [basic.stc.dynamic.allocation]p1: 5685 // The return type shall be void*. The first parameter shall have type 5686 // std::size_t. 5687 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5688 SizeTy, 5689 diag::err_operator_new_dependent_param_type, 5690 diag::err_operator_new_param_type)) 5691 return true; 5692 5693 // C++ [basic.stc.dynamic.allocation]p1: 5694 // The first parameter shall not have an associated default argument. 5695 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5696 return SemaRef.Diag(FnDecl->getLocation(), 5697 diag::err_operator_new_default_arg) 5698 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5699 5700 return false; 5701} 5702 5703static bool 5704CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5705 // C++ [basic.stc.dynamic.deallocation]p1: 5706 // A program is ill-formed if deallocation functions are declared in a 5707 // namespace scope other than global scope or declared static in global 5708 // scope. 5709 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5710 return true; 5711 5712 // C++ [basic.stc.dynamic.deallocation]p2: 5713 // Each deallocation function shall return void and its first parameter 5714 // shall be void*. 5715 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5716 SemaRef.Context.VoidPtrTy, 5717 diag::err_operator_delete_dependent_param_type, 5718 diag::err_operator_delete_param_type)) 5719 return true; 5720 5721 return false; 5722} 5723 5724/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5725/// of this overloaded operator is well-formed. If so, returns false; 5726/// otherwise, emits appropriate diagnostics and returns true. 5727bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5728 assert(FnDecl && FnDecl->isOverloadedOperator() && 5729 "Expected an overloaded operator declaration"); 5730 5731 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5732 5733 // C++ [over.oper]p5: 5734 // The allocation and deallocation functions, operator new, 5735 // operator new[], operator delete and operator delete[], are 5736 // described completely in 3.7.3. The attributes and restrictions 5737 // found in the rest of this subclause do not apply to them unless 5738 // explicitly stated in 3.7.3. 5739 if (Op == OO_Delete || Op == OO_Array_Delete) 5740 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5741 5742 if (Op == OO_New || Op == OO_Array_New) 5743 return CheckOperatorNewDeclaration(*this, FnDecl); 5744 5745 // C++ [over.oper]p6: 5746 // An operator function shall either be a non-static member 5747 // function or be a non-member function and have at least one 5748 // parameter whose type is a class, a reference to a class, an 5749 // enumeration, or a reference to an enumeration. 5750 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5751 if (MethodDecl->isStatic()) 5752 return Diag(FnDecl->getLocation(), 5753 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5754 } else { 5755 bool ClassOrEnumParam = false; 5756 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5757 ParamEnd = FnDecl->param_end(); 5758 Param != ParamEnd; ++Param) { 5759 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5760 if (ParamType->isDependentType() || ParamType->isRecordType() || 5761 ParamType->isEnumeralType()) { 5762 ClassOrEnumParam = true; 5763 break; 5764 } 5765 } 5766 5767 if (!ClassOrEnumParam) 5768 return Diag(FnDecl->getLocation(), 5769 diag::err_operator_overload_needs_class_or_enum) 5770 << FnDecl->getDeclName(); 5771 } 5772 5773 // C++ [over.oper]p8: 5774 // An operator function cannot have default arguments (8.3.6), 5775 // except where explicitly stated below. 5776 // 5777 // Only the function-call operator allows default arguments 5778 // (C++ [over.call]p1). 5779 if (Op != OO_Call) { 5780 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5781 Param != FnDecl->param_end(); ++Param) { 5782 if ((*Param)->hasDefaultArg()) 5783 return Diag((*Param)->getLocation(), 5784 diag::err_operator_overload_default_arg) 5785 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5786 } 5787 } 5788 5789 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5790 { false, false, false } 5791#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5792 , { Unary, Binary, MemberOnly } 5793#include "clang/Basic/OperatorKinds.def" 5794 }; 5795 5796 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5797 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5798 bool MustBeMemberOperator = OperatorUses[Op][2]; 5799 5800 // C++ [over.oper]p8: 5801 // [...] Operator functions cannot have more or fewer parameters 5802 // than the number required for the corresponding operator, as 5803 // described in the rest of this subclause. 5804 unsigned NumParams = FnDecl->getNumParams() 5805 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5806 if (Op != OO_Call && 5807 ((NumParams == 1 && !CanBeUnaryOperator) || 5808 (NumParams == 2 && !CanBeBinaryOperator) || 5809 (NumParams < 1) || (NumParams > 2))) { 5810 // We have the wrong number of parameters. 5811 unsigned ErrorKind; 5812 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5813 ErrorKind = 2; // 2 -> unary or binary. 5814 } else if (CanBeUnaryOperator) { 5815 ErrorKind = 0; // 0 -> unary 5816 } else { 5817 assert(CanBeBinaryOperator && 5818 "All non-call overloaded operators are unary or binary!"); 5819 ErrorKind = 1; // 1 -> binary 5820 } 5821 5822 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5823 << FnDecl->getDeclName() << NumParams << ErrorKind; 5824 } 5825 5826 // Overloaded operators other than operator() cannot be variadic. 5827 if (Op != OO_Call && 5828 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5829 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5830 << FnDecl->getDeclName(); 5831 } 5832 5833 // Some operators must be non-static member functions. 5834 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5835 return Diag(FnDecl->getLocation(), 5836 diag::err_operator_overload_must_be_member) 5837 << FnDecl->getDeclName(); 5838 } 5839 5840 // C++ [over.inc]p1: 5841 // The user-defined function called operator++ implements the 5842 // prefix and postfix ++ operator. If this function is a member 5843 // function with no parameters, or a non-member function with one 5844 // parameter of class or enumeration type, it defines the prefix 5845 // increment operator ++ for objects of that type. If the function 5846 // is a member function with one parameter (which shall be of type 5847 // int) or a non-member function with two parameters (the second 5848 // of which shall be of type int), it defines the postfix 5849 // increment operator ++ for objects of that type. 5850 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5851 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5852 bool ParamIsInt = false; 5853 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5854 ParamIsInt = BT->getKind() == BuiltinType::Int; 5855 5856 if (!ParamIsInt) 5857 return Diag(LastParam->getLocation(), 5858 diag::err_operator_overload_post_incdec_must_be_int) 5859 << LastParam->getType() << (Op == OO_MinusMinus); 5860 } 5861 5862 return false; 5863} 5864 5865/// CheckLiteralOperatorDeclaration - Check whether the declaration 5866/// of this literal operator function is well-formed. If so, returns 5867/// false; otherwise, emits appropriate diagnostics and returns true. 5868bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5869 DeclContext *DC = FnDecl->getDeclContext(); 5870 Decl::Kind Kind = DC->getDeclKind(); 5871 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5872 Kind != Decl::LinkageSpec) { 5873 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5874 << FnDecl->getDeclName(); 5875 return true; 5876 } 5877 5878 bool Valid = false; 5879 5880 // template <char...> type operator "" name() is the only valid template 5881 // signature, and the only valid signature with no parameters. 5882 if (FnDecl->param_size() == 0) { 5883 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5884 // Must have only one template parameter 5885 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5886 if (Params->size() == 1) { 5887 NonTypeTemplateParmDecl *PmDecl = 5888 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5889 5890 // The template parameter must be a char parameter pack. 5891 // FIXME: This test will always fail because non-type parameter packs 5892 // have not been implemented. 5893 if (PmDecl && PmDecl->isTemplateParameterPack() && 5894 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5895 Valid = true; 5896 } 5897 } 5898 } else { 5899 // Check the first parameter 5900 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5901 5902 QualType T = (*Param)->getType(); 5903 5904 // unsigned long long int, long double, and any character type are allowed 5905 // as the only parameters. 5906 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5907 Context.hasSameType(T, Context.LongDoubleTy) || 5908 Context.hasSameType(T, Context.CharTy) || 5909 Context.hasSameType(T, Context.WCharTy) || 5910 Context.hasSameType(T, Context.Char16Ty) || 5911 Context.hasSameType(T, Context.Char32Ty)) { 5912 if (++Param == FnDecl->param_end()) 5913 Valid = true; 5914 goto FinishedParams; 5915 } 5916 5917 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5918 const PointerType *PT = T->getAs<PointerType>(); 5919 if (!PT) 5920 goto FinishedParams; 5921 T = PT->getPointeeType(); 5922 if (!T.isConstQualified()) 5923 goto FinishedParams; 5924 T = T.getUnqualifiedType(); 5925 5926 // Move on to the second parameter; 5927 ++Param; 5928 5929 // If there is no second parameter, the first must be a const char * 5930 if (Param == FnDecl->param_end()) { 5931 if (Context.hasSameType(T, Context.CharTy)) 5932 Valid = true; 5933 goto FinishedParams; 5934 } 5935 5936 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5937 // are allowed as the first parameter to a two-parameter function 5938 if (!(Context.hasSameType(T, Context.CharTy) || 5939 Context.hasSameType(T, Context.WCharTy) || 5940 Context.hasSameType(T, Context.Char16Ty) || 5941 Context.hasSameType(T, Context.Char32Ty))) 5942 goto FinishedParams; 5943 5944 // The second and final parameter must be an std::size_t 5945 T = (*Param)->getType().getUnqualifiedType(); 5946 if (Context.hasSameType(T, Context.getSizeType()) && 5947 ++Param == FnDecl->param_end()) 5948 Valid = true; 5949 } 5950 5951 // FIXME: This diagnostic is absolutely terrible. 5952FinishedParams: 5953 if (!Valid) { 5954 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5955 << FnDecl->getDeclName(); 5956 return true; 5957 } 5958 5959 return false; 5960} 5961 5962/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5963/// linkage specification, including the language and (if present) 5964/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5965/// the location of the language string literal, which is provided 5966/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5967/// the '{' brace. Otherwise, this linkage specification does not 5968/// have any braces. 5969Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 5970 SourceLocation LangLoc, 5971 llvm::StringRef Lang, 5972 SourceLocation LBraceLoc) { 5973 LinkageSpecDecl::LanguageIDs Language; 5974 if (Lang == "\"C\"") 5975 Language = LinkageSpecDecl::lang_c; 5976 else if (Lang == "\"C++\"") 5977 Language = LinkageSpecDecl::lang_cxx; 5978 else { 5979 Diag(LangLoc, diag::err_bad_language); 5980 return 0; 5981 } 5982 5983 // FIXME: Add all the various semantics of linkage specifications 5984 5985 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5986 LangLoc, Language, 5987 LBraceLoc.isValid()); 5988 CurContext->addDecl(D); 5989 PushDeclContext(S, D); 5990 return D; 5991} 5992 5993/// ActOnFinishLinkageSpecification - Complete the definition of 5994/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5995/// valid, it's the position of the closing '}' brace in a linkage 5996/// specification that uses braces. 5997Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 5998 Decl *LinkageSpec, 5999 SourceLocation RBraceLoc) { 6000 if (LinkageSpec) 6001 PopDeclContext(); 6002 return LinkageSpec; 6003} 6004 6005/// \brief Perform semantic analysis for the variable declaration that 6006/// occurs within a C++ catch clause, returning the newly-created 6007/// variable. 6008VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6009 TypeSourceInfo *TInfo, 6010 IdentifierInfo *Name, 6011 SourceLocation Loc) { 6012 bool Invalid = false; 6013 QualType ExDeclType = TInfo->getType(); 6014 6015 // Arrays and functions decay. 6016 if (ExDeclType->isArrayType()) 6017 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6018 else if (ExDeclType->isFunctionType()) 6019 ExDeclType = Context.getPointerType(ExDeclType); 6020 6021 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6022 // The exception-declaration shall not denote a pointer or reference to an 6023 // incomplete type, other than [cv] void*. 6024 // N2844 forbids rvalue references. 6025 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6026 Diag(Loc, diag::err_catch_rvalue_ref); 6027 Invalid = true; 6028 } 6029 6030 // GCC allows catching pointers and references to incomplete types 6031 // as an extension; so do we, but we warn by default. 6032 6033 QualType BaseType = ExDeclType; 6034 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6035 unsigned DK = diag::err_catch_incomplete; 6036 bool IncompleteCatchIsInvalid = true; 6037 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6038 BaseType = Ptr->getPointeeType(); 6039 Mode = 1; 6040 DK = diag::ext_catch_incomplete_ptr; 6041 IncompleteCatchIsInvalid = false; 6042 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6043 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6044 BaseType = Ref->getPointeeType(); 6045 Mode = 2; 6046 DK = diag::ext_catch_incomplete_ref; 6047 IncompleteCatchIsInvalid = false; 6048 } 6049 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6050 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6051 IncompleteCatchIsInvalid) 6052 Invalid = true; 6053 6054 if (!Invalid && !ExDeclType->isDependentType() && 6055 RequireNonAbstractType(Loc, ExDeclType, 6056 diag::err_abstract_type_in_decl, 6057 AbstractVariableType)) 6058 Invalid = true; 6059 6060 // Only the non-fragile NeXT runtime currently supports C++ catches 6061 // of ObjC types, and no runtime supports catching ObjC types by value. 6062 if (!Invalid && getLangOptions().ObjC1) { 6063 QualType T = ExDeclType; 6064 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6065 T = RT->getPointeeType(); 6066 6067 if (T->isObjCObjectType()) { 6068 Diag(Loc, diag::err_objc_object_catch); 6069 Invalid = true; 6070 } else if (T->isObjCObjectPointerType()) { 6071 if (!getLangOptions().NeXTRuntime) { 6072 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6073 Invalid = true; 6074 } else if (!getLangOptions().ObjCNonFragileABI) { 6075 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6076 Invalid = true; 6077 } 6078 } 6079 } 6080 6081 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6082 Name, ExDeclType, TInfo, SC_None, 6083 SC_None); 6084 ExDecl->setExceptionVariable(true); 6085 6086 if (!Invalid) { 6087 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6088 // C++ [except.handle]p16: 6089 // The object declared in an exception-declaration or, if the 6090 // exception-declaration does not specify a name, a temporary (12.2) is 6091 // copy-initialized (8.5) from the exception object. [...] 6092 // The object is destroyed when the handler exits, after the destruction 6093 // of any automatic objects initialized within the handler. 6094 // 6095 // We just pretend to initialize the object with itself, then make sure 6096 // it can be destroyed later. 6097 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6098 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6099 Loc, ExDeclType, VK_LValue, 0); 6100 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6101 SourceLocation()); 6102 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6103 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6104 MultiExprArg(*this, &ExDeclRef, 1)); 6105 if (Result.isInvalid()) 6106 Invalid = true; 6107 else 6108 FinalizeVarWithDestructor(ExDecl, RecordTy); 6109 } 6110 } 6111 6112 if (Invalid) 6113 ExDecl->setInvalidDecl(); 6114 6115 return ExDecl; 6116} 6117 6118/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6119/// handler. 6120Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6121 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6122 QualType ExDeclType = TInfo->getType(); 6123 6124 bool Invalid = D.isInvalidType(); 6125 IdentifierInfo *II = D.getIdentifier(); 6126 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6127 LookupOrdinaryName, 6128 ForRedeclaration)) { 6129 // The scope should be freshly made just for us. There is just no way 6130 // it contains any previous declaration. 6131 assert(!S->isDeclScope(PrevDecl)); 6132 if (PrevDecl->isTemplateParameter()) { 6133 // Maybe we will complain about the shadowed template parameter. 6134 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6135 } 6136 } 6137 6138 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6139 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6140 << D.getCXXScopeSpec().getRange(); 6141 Invalid = true; 6142 } 6143 6144 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6145 D.getIdentifier(), 6146 D.getIdentifierLoc()); 6147 6148 if (Invalid) 6149 ExDecl->setInvalidDecl(); 6150 6151 // Add the exception declaration into this scope. 6152 if (II) 6153 PushOnScopeChains(ExDecl, S); 6154 else 6155 CurContext->addDecl(ExDecl); 6156 6157 ProcessDeclAttributes(S, ExDecl, D); 6158 return ExDecl; 6159} 6160 6161Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6162 Expr *AssertExpr, 6163 Expr *AssertMessageExpr_) { 6164 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6165 6166 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6167 llvm::APSInt Value(32); 6168 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6169 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6170 AssertExpr->getSourceRange(); 6171 return 0; 6172 } 6173 6174 if (Value == 0) { 6175 Diag(AssertLoc, diag::err_static_assert_failed) 6176 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6177 } 6178 } 6179 6180 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6181 AssertExpr, AssertMessage); 6182 6183 CurContext->addDecl(Decl); 6184 return Decl; 6185} 6186 6187/// \brief Perform semantic analysis of the given friend type declaration. 6188/// 6189/// \returns A friend declaration that. 6190FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6191 TypeSourceInfo *TSInfo) { 6192 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6193 6194 QualType T = TSInfo->getType(); 6195 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6196 6197 if (!getLangOptions().CPlusPlus0x) { 6198 // C++03 [class.friend]p2: 6199 // An elaborated-type-specifier shall be used in a friend declaration 6200 // for a class.* 6201 // 6202 // * The class-key of the elaborated-type-specifier is required. 6203 if (!ActiveTemplateInstantiations.empty()) { 6204 // Do not complain about the form of friend template types during 6205 // template instantiation; we will already have complained when the 6206 // template was declared. 6207 } else if (!T->isElaboratedTypeSpecifier()) { 6208 // If we evaluated the type to a record type, suggest putting 6209 // a tag in front. 6210 if (const RecordType *RT = T->getAs<RecordType>()) { 6211 RecordDecl *RD = RT->getDecl(); 6212 6213 std::string InsertionText = std::string(" ") + RD->getKindName(); 6214 6215 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6216 << (unsigned) RD->getTagKind() 6217 << T 6218 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6219 InsertionText); 6220 } else { 6221 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6222 << T 6223 << SourceRange(FriendLoc, TypeRange.getEnd()); 6224 } 6225 } else if (T->getAs<EnumType>()) { 6226 Diag(FriendLoc, diag::ext_enum_friend) 6227 << T 6228 << SourceRange(FriendLoc, TypeRange.getEnd()); 6229 } 6230 } 6231 6232 // C++0x [class.friend]p3: 6233 // If the type specifier in a friend declaration designates a (possibly 6234 // cv-qualified) class type, that class is declared as a friend; otherwise, 6235 // the friend declaration is ignored. 6236 6237 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6238 // in [class.friend]p3 that we do not implement. 6239 6240 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6241} 6242 6243/// Handle a friend tag declaration where the scope specifier was 6244/// templated. 6245Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6246 unsigned TagSpec, SourceLocation TagLoc, 6247 CXXScopeSpec &SS, 6248 IdentifierInfo *Name, SourceLocation NameLoc, 6249 AttributeList *Attr, 6250 MultiTemplateParamsArg TempParamLists) { 6251 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6252 6253 bool isExplicitSpecialization = false; 6254 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6255 bool Invalid = false; 6256 6257 if (TemplateParameterList *TemplateParams 6258 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6259 TempParamLists.get(), 6260 TempParamLists.size(), 6261 /*friend*/ true, 6262 isExplicitSpecialization, 6263 Invalid)) { 6264 --NumMatchedTemplateParamLists; 6265 6266 if (TemplateParams->size() > 0) { 6267 // This is a declaration of a class template. 6268 if (Invalid) 6269 return 0; 6270 6271 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6272 SS, Name, NameLoc, Attr, 6273 TemplateParams, AS_public).take(); 6274 } else { 6275 // The "template<>" header is extraneous. 6276 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6277 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6278 isExplicitSpecialization = true; 6279 } 6280 } 6281 6282 if (Invalid) return 0; 6283 6284 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6285 6286 bool isAllExplicitSpecializations = true; 6287 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6288 if (TempParamLists.get()[I]->size()) { 6289 isAllExplicitSpecializations = false; 6290 break; 6291 } 6292 } 6293 6294 // FIXME: don't ignore attributes. 6295 6296 // If it's explicit specializations all the way down, just forget 6297 // about the template header and build an appropriate non-templated 6298 // friend. TODO: for source fidelity, remember the headers. 6299 if (isAllExplicitSpecializations) { 6300 ElaboratedTypeKeyword Keyword 6301 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6302 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6303 TagLoc, SS.getRange(), NameLoc); 6304 if (T.isNull()) 6305 return 0; 6306 6307 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6308 if (isa<DependentNameType>(T)) { 6309 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6310 TL.setKeywordLoc(TagLoc); 6311 TL.setQualifierRange(SS.getRange()); 6312 TL.setNameLoc(NameLoc); 6313 } else { 6314 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6315 TL.setKeywordLoc(TagLoc); 6316 TL.setQualifierRange(SS.getRange()); 6317 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6318 } 6319 6320 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6321 TSI, FriendLoc); 6322 Friend->setAccess(AS_public); 6323 CurContext->addDecl(Friend); 6324 return Friend; 6325 } 6326 6327 // Handle the case of a templated-scope friend class. e.g. 6328 // template <class T> class A<T>::B; 6329 // FIXME: we don't support these right now. 6330 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6331 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6332 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6333 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6334 TL.setKeywordLoc(TagLoc); 6335 TL.setQualifierRange(SS.getRange()); 6336 TL.setNameLoc(NameLoc); 6337 6338 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6339 TSI, FriendLoc); 6340 Friend->setAccess(AS_public); 6341 Friend->setUnsupportedFriend(true); 6342 CurContext->addDecl(Friend); 6343 return Friend; 6344} 6345 6346 6347/// Handle a friend type declaration. This works in tandem with 6348/// ActOnTag. 6349/// 6350/// Notes on friend class templates: 6351/// 6352/// We generally treat friend class declarations as if they were 6353/// declaring a class. So, for example, the elaborated type specifier 6354/// in a friend declaration is required to obey the restrictions of a 6355/// class-head (i.e. no typedefs in the scope chain), template 6356/// parameters are required to match up with simple template-ids, &c. 6357/// However, unlike when declaring a template specialization, it's 6358/// okay to refer to a template specialization without an empty 6359/// template parameter declaration, e.g. 6360/// friend class A<T>::B<unsigned>; 6361/// We permit this as a special case; if there are any template 6362/// parameters present at all, require proper matching, i.e. 6363/// template <> template <class T> friend class A<int>::B; 6364Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6365 MultiTemplateParamsArg TempParams) { 6366 SourceLocation Loc = DS.getSourceRange().getBegin(); 6367 6368 assert(DS.isFriendSpecified()); 6369 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6370 6371 // Try to convert the decl specifier to a type. This works for 6372 // friend templates because ActOnTag never produces a ClassTemplateDecl 6373 // for a TUK_Friend. 6374 Declarator TheDeclarator(DS, Declarator::MemberContext); 6375 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6376 QualType T = TSI->getType(); 6377 if (TheDeclarator.isInvalidType()) 6378 return 0; 6379 6380 // This is definitely an error in C++98. It's probably meant to 6381 // be forbidden in C++0x, too, but the specification is just 6382 // poorly written. 6383 // 6384 // The problem is with declarations like the following: 6385 // template <T> friend A<T>::foo; 6386 // where deciding whether a class C is a friend or not now hinges 6387 // on whether there exists an instantiation of A that causes 6388 // 'foo' to equal C. There are restrictions on class-heads 6389 // (which we declare (by fiat) elaborated friend declarations to 6390 // be) that makes this tractable. 6391 // 6392 // FIXME: handle "template <> friend class A<T>;", which 6393 // is possibly well-formed? Who even knows? 6394 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6395 Diag(Loc, diag::err_tagless_friend_type_template) 6396 << DS.getSourceRange(); 6397 return 0; 6398 } 6399 6400 // C++98 [class.friend]p1: A friend of a class is a function 6401 // or class that is not a member of the class . . . 6402 // This is fixed in DR77, which just barely didn't make the C++03 6403 // deadline. It's also a very silly restriction that seriously 6404 // affects inner classes and which nobody else seems to implement; 6405 // thus we never diagnose it, not even in -pedantic. 6406 // 6407 // But note that we could warn about it: it's always useless to 6408 // friend one of your own members (it's not, however, worthless to 6409 // friend a member of an arbitrary specialization of your template). 6410 6411 Decl *D; 6412 if (unsigned NumTempParamLists = TempParams.size()) 6413 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6414 NumTempParamLists, 6415 TempParams.release(), 6416 TSI, 6417 DS.getFriendSpecLoc()); 6418 else 6419 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6420 6421 if (!D) 6422 return 0; 6423 6424 D->setAccess(AS_public); 6425 CurContext->addDecl(D); 6426 6427 return D; 6428} 6429 6430Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6431 MultiTemplateParamsArg TemplateParams) { 6432 const DeclSpec &DS = D.getDeclSpec(); 6433 6434 assert(DS.isFriendSpecified()); 6435 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6436 6437 SourceLocation Loc = D.getIdentifierLoc(); 6438 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6439 QualType T = TInfo->getType(); 6440 6441 // C++ [class.friend]p1 6442 // A friend of a class is a function or class.... 6443 // Note that this sees through typedefs, which is intended. 6444 // It *doesn't* see through dependent types, which is correct 6445 // according to [temp.arg.type]p3: 6446 // If a declaration acquires a function type through a 6447 // type dependent on a template-parameter and this causes 6448 // a declaration that does not use the syntactic form of a 6449 // function declarator to have a function type, the program 6450 // is ill-formed. 6451 if (!T->isFunctionType()) { 6452 Diag(Loc, diag::err_unexpected_friend); 6453 6454 // It might be worthwhile to try to recover by creating an 6455 // appropriate declaration. 6456 return 0; 6457 } 6458 6459 // C++ [namespace.memdef]p3 6460 // - If a friend declaration in a non-local class first declares a 6461 // class or function, the friend class or function is a member 6462 // of the innermost enclosing namespace. 6463 // - The name of the friend is not found by simple name lookup 6464 // until a matching declaration is provided in that namespace 6465 // scope (either before or after the class declaration granting 6466 // friendship). 6467 // - If a friend function is called, its name may be found by the 6468 // name lookup that considers functions from namespaces and 6469 // classes associated with the types of the function arguments. 6470 // - When looking for a prior declaration of a class or a function 6471 // declared as a friend, scopes outside the innermost enclosing 6472 // namespace scope are not considered. 6473 6474 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6475 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6476 DeclarationName Name = NameInfo.getName(); 6477 assert(Name); 6478 6479 // The context we found the declaration in, or in which we should 6480 // create the declaration. 6481 DeclContext *DC; 6482 Scope *DCScope = S; 6483 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6484 ForRedeclaration); 6485 6486 // FIXME: there are different rules in local classes 6487 6488 // There are four cases here. 6489 // - There's no scope specifier, in which case we just go to the 6490 // appropriate scope and look for a function or function template 6491 // there as appropriate. 6492 // Recover from invalid scope qualifiers as if they just weren't there. 6493 if (SS.isInvalid() || !SS.isSet()) { 6494 // C++0x [namespace.memdef]p3: 6495 // If the name in a friend declaration is neither qualified nor 6496 // a template-id and the declaration is a function or an 6497 // elaborated-type-specifier, the lookup to determine whether 6498 // the entity has been previously declared shall not consider 6499 // any scopes outside the innermost enclosing namespace. 6500 // C++0x [class.friend]p11: 6501 // If a friend declaration appears in a local class and the name 6502 // specified is an unqualified name, a prior declaration is 6503 // looked up without considering scopes that are outside the 6504 // innermost enclosing non-class scope. For a friend function 6505 // declaration, if there is no prior declaration, the program is 6506 // ill-formed. 6507 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6508 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 6509 6510 // Find the appropriate context according to the above. 6511 DC = CurContext; 6512 while (true) { 6513 // Skip class contexts. If someone can cite chapter and verse 6514 // for this behavior, that would be nice --- it's what GCC and 6515 // EDG do, and it seems like a reasonable intent, but the spec 6516 // really only says that checks for unqualified existing 6517 // declarations should stop at the nearest enclosing namespace, 6518 // not that they should only consider the nearest enclosing 6519 // namespace. 6520 while (DC->isRecord()) 6521 DC = DC->getParent(); 6522 6523 LookupQualifiedName(Previous, DC); 6524 6525 // TODO: decide what we think about using declarations. 6526 if (isLocal || !Previous.empty()) 6527 break; 6528 6529 if (isTemplateId) { 6530 if (isa<TranslationUnitDecl>(DC)) break; 6531 } else { 6532 if (DC->isFileContext()) break; 6533 } 6534 DC = DC->getParent(); 6535 } 6536 6537 // C++ [class.friend]p1: A friend of a class is a function or 6538 // class that is not a member of the class . . . 6539 // C++0x changes this for both friend types and functions. 6540 // Most C++ 98 compilers do seem to give an error here, so 6541 // we do, too. 6542 if (!Previous.empty() && DC->Equals(CurContext) 6543 && !getLangOptions().CPlusPlus0x) 6544 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6545 6546 DCScope = getScopeForDeclContext(S, DC); 6547 6548 // - There's a non-dependent scope specifier, in which case we 6549 // compute it and do a previous lookup there for a function 6550 // or function template. 6551 } else if (!SS.getScopeRep()->isDependent()) { 6552 DC = computeDeclContext(SS); 6553 if (!DC) return 0; 6554 6555 if (RequireCompleteDeclContext(SS, DC)) return 0; 6556 6557 LookupQualifiedName(Previous, DC); 6558 6559 // Ignore things found implicitly in the wrong scope. 6560 // TODO: better diagnostics for this case. Suggesting the right 6561 // qualified scope would be nice... 6562 LookupResult::Filter F = Previous.makeFilter(); 6563 while (F.hasNext()) { 6564 NamedDecl *D = F.next(); 6565 if (!DC->InEnclosingNamespaceSetOf( 6566 D->getDeclContext()->getRedeclContext())) 6567 F.erase(); 6568 } 6569 F.done(); 6570 6571 if (Previous.empty()) { 6572 D.setInvalidType(); 6573 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6574 return 0; 6575 } 6576 6577 // C++ [class.friend]p1: A friend of a class is a function or 6578 // class that is not a member of the class . . . 6579 if (DC->Equals(CurContext)) 6580 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6581 6582 // - There's a scope specifier that does not match any template 6583 // parameter lists, in which case we use some arbitrary context, 6584 // create a method or method template, and wait for instantiation. 6585 // - There's a scope specifier that does match some template 6586 // parameter lists, which we don't handle right now. 6587 } else { 6588 DC = CurContext; 6589 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6590 } 6591 6592 if (!DC->isRecord()) { 6593 // This implies that it has to be an operator or function. 6594 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6595 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6596 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6597 Diag(Loc, diag::err_introducing_special_friend) << 6598 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6599 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6600 return 0; 6601 } 6602 } 6603 6604 bool Redeclaration = false; 6605 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6606 move(TemplateParams), 6607 IsDefinition, 6608 Redeclaration); 6609 if (!ND) return 0; 6610 6611 assert(ND->getDeclContext() == DC); 6612 assert(ND->getLexicalDeclContext() == CurContext); 6613 6614 // Add the function declaration to the appropriate lookup tables, 6615 // adjusting the redeclarations list as necessary. We don't 6616 // want to do this yet if the friending class is dependent. 6617 // 6618 // Also update the scope-based lookup if the target context's 6619 // lookup context is in lexical scope. 6620 if (!CurContext->isDependentContext()) { 6621 DC = DC->getRedeclContext(); 6622 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6623 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6624 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6625 } 6626 6627 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6628 D.getIdentifierLoc(), ND, 6629 DS.getFriendSpecLoc()); 6630 FrD->setAccess(AS_public); 6631 CurContext->addDecl(FrD); 6632 6633 if (ND->isInvalidDecl()) 6634 FrD->setInvalidDecl(); 6635 else { 6636 FunctionDecl *FD; 6637 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 6638 FD = FTD->getTemplatedDecl(); 6639 else 6640 FD = cast<FunctionDecl>(ND); 6641 6642 // Mark templated-scope function declarations as unsupported. 6643 if (FD->getNumTemplateParameterLists()) 6644 FrD->setUnsupportedFriend(true); 6645 } 6646 6647 return ND; 6648} 6649 6650void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6651 AdjustDeclIfTemplate(Dcl); 6652 6653 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6654 if (!Fn) { 6655 Diag(DelLoc, diag::err_deleted_non_function); 6656 return; 6657 } 6658 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6659 Diag(DelLoc, diag::err_deleted_decl_not_first); 6660 Diag(Prev->getLocation(), diag::note_previous_declaration); 6661 // If the declaration wasn't the first, we delete the function anyway for 6662 // recovery. 6663 } 6664 Fn->setDeleted(); 6665} 6666 6667static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6668 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6669 ++CI) { 6670 Stmt *SubStmt = *CI; 6671 if (!SubStmt) 6672 continue; 6673 if (isa<ReturnStmt>(SubStmt)) 6674 Self.Diag(SubStmt->getSourceRange().getBegin(), 6675 diag::err_return_in_constructor_handler); 6676 if (!isa<Expr>(SubStmt)) 6677 SearchForReturnInStmt(Self, SubStmt); 6678 } 6679} 6680 6681void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6682 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6683 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6684 SearchForReturnInStmt(*this, Handler); 6685 } 6686} 6687 6688bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6689 const CXXMethodDecl *Old) { 6690 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6691 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6692 6693 if (Context.hasSameType(NewTy, OldTy) || 6694 NewTy->isDependentType() || OldTy->isDependentType()) 6695 return false; 6696 6697 // Check if the return types are covariant 6698 QualType NewClassTy, OldClassTy; 6699 6700 /// Both types must be pointers or references to classes. 6701 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6702 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6703 NewClassTy = NewPT->getPointeeType(); 6704 OldClassTy = OldPT->getPointeeType(); 6705 } 6706 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6707 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6708 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6709 NewClassTy = NewRT->getPointeeType(); 6710 OldClassTy = OldRT->getPointeeType(); 6711 } 6712 } 6713 } 6714 6715 // The return types aren't either both pointers or references to a class type. 6716 if (NewClassTy.isNull()) { 6717 Diag(New->getLocation(), 6718 diag::err_different_return_type_for_overriding_virtual_function) 6719 << New->getDeclName() << NewTy << OldTy; 6720 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6721 6722 return true; 6723 } 6724 6725 // C++ [class.virtual]p6: 6726 // If the return type of D::f differs from the return type of B::f, the 6727 // class type in the return type of D::f shall be complete at the point of 6728 // declaration of D::f or shall be the class type D. 6729 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6730 if (!RT->isBeingDefined() && 6731 RequireCompleteType(New->getLocation(), NewClassTy, 6732 PDiag(diag::err_covariant_return_incomplete) 6733 << New->getDeclName())) 6734 return true; 6735 } 6736 6737 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6738 // Check if the new class derives from the old class. 6739 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6740 Diag(New->getLocation(), 6741 diag::err_covariant_return_not_derived) 6742 << New->getDeclName() << NewTy << OldTy; 6743 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6744 return true; 6745 } 6746 6747 // Check if we the conversion from derived to base is valid. 6748 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6749 diag::err_covariant_return_inaccessible_base, 6750 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6751 // FIXME: Should this point to the return type? 6752 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6753 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6754 return true; 6755 } 6756 } 6757 6758 // The qualifiers of the return types must be the same. 6759 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6760 Diag(New->getLocation(), 6761 diag::err_covariant_return_type_different_qualifications) 6762 << New->getDeclName() << NewTy << OldTy; 6763 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6764 return true; 6765 }; 6766 6767 6768 // The new class type must have the same or less qualifiers as the old type. 6769 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6770 Diag(New->getLocation(), 6771 diag::err_covariant_return_type_class_type_more_qualified) 6772 << New->getDeclName() << NewTy << OldTy; 6773 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6774 return true; 6775 }; 6776 6777 return false; 6778} 6779 6780bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6781 const CXXMethodDecl *Old) 6782{ 6783 if (Old->hasAttr<FinalAttr>()) { 6784 Diag(New->getLocation(), diag::err_final_function_overridden) 6785 << New->getDeclName(); 6786 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6787 return true; 6788 } 6789 6790 return false; 6791} 6792 6793/// \brief Mark the given method pure. 6794/// 6795/// \param Method the method to be marked pure. 6796/// 6797/// \param InitRange the source range that covers the "0" initializer. 6798bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6799 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6800 Method->setPure(); 6801 return false; 6802 } 6803 6804 if (!Method->isInvalidDecl()) 6805 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6806 << Method->getDeclName() << InitRange; 6807 return true; 6808} 6809 6810/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6811/// an initializer for the out-of-line declaration 'Dcl'. The scope 6812/// is a fresh scope pushed for just this purpose. 6813/// 6814/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6815/// static data member of class X, names should be looked up in the scope of 6816/// class X. 6817void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6818 // If there is no declaration, there was an error parsing it. 6819 if (D == 0) return; 6820 6821 // We should only get called for declarations with scope specifiers, like: 6822 // int foo::bar; 6823 assert(D->isOutOfLine()); 6824 EnterDeclaratorContext(S, D->getDeclContext()); 6825} 6826 6827/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6828/// initializer for the out-of-line declaration 'D'. 6829void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6830 // If there is no declaration, there was an error parsing it. 6831 if (D == 0) return; 6832 6833 assert(D->isOutOfLine()); 6834 ExitDeclaratorContext(S); 6835} 6836 6837/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6838/// C++ if/switch/while/for statement. 6839/// e.g: "if (int x = f()) {...}" 6840DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6841 // C++ 6.4p2: 6842 // The declarator shall not specify a function or an array. 6843 // The type-specifier-seq shall not contain typedef and shall not declare a 6844 // new class or enumeration. 6845 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6846 "Parser allowed 'typedef' as storage class of condition decl."); 6847 6848 TagDecl *OwnedTag = 0; 6849 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6850 QualType Ty = TInfo->getType(); 6851 6852 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6853 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6854 // would be created and CXXConditionDeclExpr wants a VarDecl. 6855 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6856 << D.getSourceRange(); 6857 return DeclResult(); 6858 } else if (OwnedTag && OwnedTag->isDefinition()) { 6859 // The type-specifier-seq shall not declare a new class or enumeration. 6860 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6861 } 6862 6863 Decl *Dcl = ActOnDeclarator(S, D); 6864 if (!Dcl) 6865 return DeclResult(); 6866 6867 return Dcl; 6868} 6869 6870void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6871 bool DefinitionRequired) { 6872 // Ignore any vtable uses in unevaluated operands or for classes that do 6873 // not have a vtable. 6874 if (!Class->isDynamicClass() || Class->isDependentContext() || 6875 CurContext->isDependentContext() || 6876 ExprEvalContexts.back().Context == Unevaluated) 6877 return; 6878 6879 // Try to insert this class into the map. 6880 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6881 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6882 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6883 if (!Pos.second) { 6884 // If we already had an entry, check to see if we are promoting this vtable 6885 // to required a definition. If so, we need to reappend to the VTableUses 6886 // list, since we may have already processed the first entry. 6887 if (DefinitionRequired && !Pos.first->second) { 6888 Pos.first->second = true; 6889 } else { 6890 // Otherwise, we can early exit. 6891 return; 6892 } 6893 } 6894 6895 // Local classes need to have their virtual members marked 6896 // immediately. For all other classes, we mark their virtual members 6897 // at the end of the translation unit. 6898 if (Class->isLocalClass()) 6899 MarkVirtualMembersReferenced(Loc, Class); 6900 else 6901 VTableUses.push_back(std::make_pair(Class, Loc)); 6902} 6903 6904bool Sema::DefineUsedVTables() { 6905 // If any dynamic classes have their key function defined within 6906 // this translation unit, then those vtables are considered "used" and must 6907 // be emitted. 6908 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6909 if (const CXXMethodDecl *KeyFunction 6910 = Context.getKeyFunction(DynamicClasses[I])) { 6911 const FunctionDecl *Definition = 0; 6912 if (KeyFunction->hasBody(Definition)) 6913 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6914 } 6915 } 6916 6917 if (VTableUses.empty()) 6918 return false; 6919 6920 // Note: The VTableUses vector could grow as a result of marking 6921 // the members of a class as "used", so we check the size each 6922 // time through the loop and prefer indices (with are stable) to 6923 // iterators (which are not). 6924 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6925 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6926 if (!Class) 6927 continue; 6928 6929 SourceLocation Loc = VTableUses[I].second; 6930 6931 // If this class has a key function, but that key function is 6932 // defined in another translation unit, we don't need to emit the 6933 // vtable even though we're using it. 6934 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6935 if (KeyFunction && !KeyFunction->hasBody()) { 6936 switch (KeyFunction->getTemplateSpecializationKind()) { 6937 case TSK_Undeclared: 6938 case TSK_ExplicitSpecialization: 6939 case TSK_ExplicitInstantiationDeclaration: 6940 // The key function is in another translation unit. 6941 continue; 6942 6943 case TSK_ExplicitInstantiationDefinition: 6944 case TSK_ImplicitInstantiation: 6945 // We will be instantiating the key function. 6946 break; 6947 } 6948 } else if (!KeyFunction) { 6949 // If we have a class with no key function that is the subject 6950 // of an explicit instantiation declaration, suppress the 6951 // vtable; it will live with the explicit instantiation 6952 // definition. 6953 bool IsExplicitInstantiationDeclaration 6954 = Class->getTemplateSpecializationKind() 6955 == TSK_ExplicitInstantiationDeclaration; 6956 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6957 REnd = Class->redecls_end(); 6958 R != REnd; ++R) { 6959 TemplateSpecializationKind TSK 6960 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6961 if (TSK == TSK_ExplicitInstantiationDeclaration) 6962 IsExplicitInstantiationDeclaration = true; 6963 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6964 IsExplicitInstantiationDeclaration = false; 6965 break; 6966 } 6967 } 6968 6969 if (IsExplicitInstantiationDeclaration) 6970 continue; 6971 } 6972 6973 // Mark all of the virtual members of this class as referenced, so 6974 // that we can build a vtable. Then, tell the AST consumer that a 6975 // vtable for this class is required. 6976 MarkVirtualMembersReferenced(Loc, Class); 6977 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6978 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6979 6980 // Optionally warn if we're emitting a weak vtable. 6981 if (Class->getLinkage() == ExternalLinkage && 6982 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6983 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6984 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6985 } 6986 } 6987 VTableUses.clear(); 6988 6989 return true; 6990} 6991 6992void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6993 const CXXRecordDecl *RD) { 6994 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6995 e = RD->method_end(); i != e; ++i) { 6996 CXXMethodDecl *MD = *i; 6997 6998 // C++ [basic.def.odr]p2: 6999 // [...] A virtual member function is used if it is not pure. [...] 7000 if (MD->isVirtual() && !MD->isPure()) 7001 MarkDeclarationReferenced(Loc, MD); 7002 } 7003 7004 // Only classes that have virtual bases need a VTT. 7005 if (RD->getNumVBases() == 0) 7006 return; 7007 7008 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7009 e = RD->bases_end(); i != e; ++i) { 7010 const CXXRecordDecl *Base = 7011 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7012 if (Base->getNumVBases() == 0) 7013 continue; 7014 MarkVirtualMembersReferenced(Loc, Base); 7015 } 7016} 7017 7018/// SetIvarInitializers - This routine builds initialization ASTs for the 7019/// Objective-C implementation whose ivars need be initialized. 7020void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7021 if (!getLangOptions().CPlusPlus) 7022 return; 7023 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7024 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7025 CollectIvarsToConstructOrDestruct(OID, ivars); 7026 if (ivars.empty()) 7027 return; 7028 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 7029 for (unsigned i = 0; i < ivars.size(); i++) { 7030 FieldDecl *Field = ivars[i]; 7031 if (Field->isInvalidDecl()) 7032 continue; 7033 7034 CXXBaseOrMemberInitializer *Member; 7035 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7036 InitializationKind InitKind = 7037 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7038 7039 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7040 ExprResult MemberInit = 7041 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7042 MemberInit = MaybeCreateExprWithCleanups(MemberInit.get()); 7043 // Note, MemberInit could actually come back empty if no initialization 7044 // is required (e.g., because it would call a trivial default constructor) 7045 if (!MemberInit.get() || MemberInit.isInvalid()) 7046 continue; 7047 7048 Member = 7049 new (Context) CXXBaseOrMemberInitializer(Context, 7050 Field, SourceLocation(), 7051 SourceLocation(), 7052 MemberInit.takeAs<Expr>(), 7053 SourceLocation()); 7054 AllToInit.push_back(Member); 7055 7056 // Be sure that the destructor is accessible and is marked as referenced. 7057 if (const RecordType *RecordTy 7058 = Context.getBaseElementType(Field->getType()) 7059 ->getAs<RecordType>()) { 7060 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7061 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7062 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7063 CheckDestructorAccess(Field->getLocation(), Destructor, 7064 PDiag(diag::err_access_dtor_ivar) 7065 << Context.getBaseElementType(Field->getType())); 7066 } 7067 } 7068 } 7069 ObjCImplementation->setIvarInitializers(Context, 7070 AllToInit.data(), AllToInit.size()); 7071 } 7072} 7073