SemaDeclCXX.cpp revision 90ba6d5cf790c98231c93a63a5b1f7c6a95bd6b6
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check that the default argument is well-formed 181 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 182 if (DefaultArgChecker.Visit(DefaultArg)) { 183 Param->setInvalidDecl(); 184 return; 185 } 186 187 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 188} 189 190/// ActOnParamUnparsedDefaultArgument - We've seen a default 191/// argument for a function parameter, but we can't parse it yet 192/// because we're inside a class definition. Note that this default 193/// argument will be parsed later. 194void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 195 SourceLocation EqualLoc, 196 SourceLocation ArgLoc) { 197 if (!param) 198 return; 199 200 ParmVarDecl *Param = cast<ParmVarDecl>(param); 201 if (Param) 202 Param->setUnparsedDefaultArg(); 203 204 UnparsedDefaultArgLocs[Param] = ArgLoc; 205} 206 207/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 208/// the default argument for the parameter param failed. 209void Sema::ActOnParamDefaultArgumentError(Decl *param) { 210 if (!param) 211 return; 212 213 ParmVarDecl *Param = cast<ParmVarDecl>(param); 214 215 Param->setInvalidDecl(); 216 217 UnparsedDefaultArgLocs.erase(Param); 218} 219 220/// CheckExtraCXXDefaultArguments - Check for any extra default 221/// arguments in the declarator, which is not a function declaration 222/// or definition and therefore is not permitted to have default 223/// arguments. This routine should be invoked for every declarator 224/// that is not a function declaration or definition. 225void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 226 // C++ [dcl.fct.default]p3 227 // A default argument expression shall be specified only in the 228 // parameter-declaration-clause of a function declaration or in a 229 // template-parameter (14.1). It shall not be specified for a 230 // parameter pack. If it is specified in a 231 // parameter-declaration-clause, it shall not occur within a 232 // declarator or abstract-declarator of a parameter-declaration. 233 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 234 DeclaratorChunk &chunk = D.getTypeObject(i); 235 if (chunk.Kind == DeclaratorChunk::Function) { 236 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 237 ParmVarDecl *Param = 238 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 239 if (Param->hasUnparsedDefaultArg()) { 240 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 241 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 242 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 243 delete Toks; 244 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 245 } else if (Param->getDefaultArg()) { 246 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 247 << Param->getDefaultArg()->getSourceRange(); 248 Param->setDefaultArg(0); 249 } 250 } 251 } 252 } 253} 254 255// MergeCXXFunctionDecl - Merge two declarations of the same C++ 256// function, once we already know that they have the same 257// type. Subroutine of MergeFunctionDecl. Returns true if there was an 258// error, false otherwise. 259bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 260 bool Invalid = false; 261 262 // C++ [dcl.fct.default]p4: 263 // For non-template functions, default arguments can be added in 264 // later declarations of a function in the same 265 // scope. Declarations in different scopes have completely 266 // distinct sets of default arguments. That is, declarations in 267 // inner scopes do not acquire default arguments from 268 // declarations in outer scopes, and vice versa. In a given 269 // function declaration, all parameters subsequent to a 270 // parameter with a default argument shall have default 271 // arguments supplied in this or previous declarations. A 272 // default argument shall not be redefined by a later 273 // declaration (not even to the same value). 274 // 275 // C++ [dcl.fct.default]p6: 276 // Except for member functions of class templates, the default arguments 277 // in a member function definition that appears outside of the class 278 // definition are added to the set of default arguments provided by the 279 // member function declaration in the class definition. 280 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 281 ParmVarDecl *OldParam = Old->getParamDecl(p); 282 ParmVarDecl *NewParam = New->getParamDecl(p); 283 284 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 285 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 286 // hint here. Alternatively, we could walk the type-source information 287 // for NewParam to find the last source location in the type... but it 288 // isn't worth the effort right now. This is the kind of test case that 289 // is hard to get right: 290 291 // int f(int); 292 // void g(int (*fp)(int) = f); 293 // void g(int (*fp)(int) = &f); 294 Diag(NewParam->getLocation(), 295 diag::err_param_default_argument_redefinition) 296 << NewParam->getDefaultArgRange(); 297 298 // Look for the function declaration where the default argument was 299 // actually written, which may be a declaration prior to Old. 300 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 301 Older; Older = Older->getPreviousDeclaration()) { 302 if (!Older->getParamDecl(p)->hasDefaultArg()) 303 break; 304 305 OldParam = Older->getParamDecl(p); 306 } 307 308 Diag(OldParam->getLocation(), diag::note_previous_definition) 309 << OldParam->getDefaultArgRange(); 310 Invalid = true; 311 } else if (OldParam->hasDefaultArg()) { 312 // Merge the old default argument into the new parameter. 313 // It's important to use getInit() here; getDefaultArg() 314 // strips off any top-level CXXExprWithTemporaries. 315 NewParam->setHasInheritedDefaultArg(); 316 if (OldParam->hasUninstantiatedDefaultArg()) 317 NewParam->setUninstantiatedDefaultArg( 318 OldParam->getUninstantiatedDefaultArg()); 319 else 320 NewParam->setDefaultArg(OldParam->getInit()); 321 } else if (NewParam->hasDefaultArg()) { 322 if (New->getDescribedFunctionTemplate()) { 323 // Paragraph 4, quoted above, only applies to non-template functions. 324 Diag(NewParam->getLocation(), 325 diag::err_param_default_argument_template_redecl) 326 << NewParam->getDefaultArgRange(); 327 Diag(Old->getLocation(), diag::note_template_prev_declaration) 328 << false; 329 } else if (New->getTemplateSpecializationKind() 330 != TSK_ImplicitInstantiation && 331 New->getTemplateSpecializationKind() != TSK_Undeclared) { 332 // C++ [temp.expr.spec]p21: 333 // Default function arguments shall not be specified in a declaration 334 // or a definition for one of the following explicit specializations: 335 // - the explicit specialization of a function template; 336 // - the explicit specialization of a member function template; 337 // - the explicit specialization of a member function of a class 338 // template where the class template specialization to which the 339 // member function specialization belongs is implicitly 340 // instantiated. 341 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 342 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 343 << New->getDeclName() 344 << NewParam->getDefaultArgRange(); 345 } else if (New->getDeclContext()->isDependentContext()) { 346 // C++ [dcl.fct.default]p6 (DR217): 347 // Default arguments for a member function of a class template shall 348 // be specified on the initial declaration of the member function 349 // within the class template. 350 // 351 // Reading the tea leaves a bit in DR217 and its reference to DR205 352 // leads me to the conclusion that one cannot add default function 353 // arguments for an out-of-line definition of a member function of a 354 // dependent type. 355 int WhichKind = 2; 356 if (CXXRecordDecl *Record 357 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 358 if (Record->getDescribedClassTemplate()) 359 WhichKind = 0; 360 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 361 WhichKind = 1; 362 else 363 WhichKind = 2; 364 } 365 366 Diag(NewParam->getLocation(), 367 diag::err_param_default_argument_member_template_redecl) 368 << WhichKind 369 << NewParam->getDefaultArgRange(); 370 } 371 } 372 } 373 374 if (CheckEquivalentExceptionSpec(Old, New)) 375 Invalid = true; 376 377 return Invalid; 378} 379 380/// CheckCXXDefaultArguments - Verify that the default arguments for a 381/// function declaration are well-formed according to C++ 382/// [dcl.fct.default]. 383void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 384 unsigned NumParams = FD->getNumParams(); 385 unsigned p; 386 387 // Find first parameter with a default argument 388 for (p = 0; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (Param->hasDefaultArg()) 391 break; 392 } 393 394 // C++ [dcl.fct.default]p4: 395 // In a given function declaration, all parameters 396 // subsequent to a parameter with a default argument shall 397 // have default arguments supplied in this or previous 398 // declarations. A default argument shall not be redefined 399 // by a later declaration (not even to the same value). 400 unsigned LastMissingDefaultArg = 0; 401 for (; p < NumParams; ++p) { 402 ParmVarDecl *Param = FD->getParamDecl(p); 403 if (!Param->hasDefaultArg()) { 404 if (Param->isInvalidDecl()) 405 /* We already complained about this parameter. */; 406 else if (Param->getIdentifier()) 407 Diag(Param->getLocation(), 408 diag::err_param_default_argument_missing_name) 409 << Param->getIdentifier(); 410 else 411 Diag(Param->getLocation(), 412 diag::err_param_default_argument_missing); 413 414 LastMissingDefaultArg = p; 415 } 416 } 417 418 if (LastMissingDefaultArg > 0) { 419 // Some default arguments were missing. Clear out all of the 420 // default arguments up to (and including) the last missing 421 // default argument, so that we leave the function parameters 422 // in a semantically valid state. 423 for (p = 0; p <= LastMissingDefaultArg; ++p) { 424 ParmVarDecl *Param = FD->getParamDecl(p); 425 if (Param->hasDefaultArg()) { 426 Param->setDefaultArg(0); 427 } 428 } 429 } 430} 431 432/// isCurrentClassName - Determine whether the identifier II is the 433/// name of the class type currently being defined. In the case of 434/// nested classes, this will only return true if II is the name of 435/// the innermost class. 436bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 437 const CXXScopeSpec *SS) { 438 assert(getLangOptions().CPlusPlus && "No class names in C!"); 439 440 CXXRecordDecl *CurDecl; 441 if (SS && SS->isSet() && !SS->isInvalid()) { 442 DeclContext *DC = computeDeclContext(*SS, true); 443 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 444 } else 445 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 446 447 if (CurDecl && CurDecl->getIdentifier()) 448 return &II == CurDecl->getIdentifier(); 449 else 450 return false; 451} 452 453/// \brief Check the validity of a C++ base class specifier. 454/// 455/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 456/// and returns NULL otherwise. 457CXXBaseSpecifier * 458Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 459 SourceRange SpecifierRange, 460 bool Virtual, AccessSpecifier Access, 461 TypeSourceInfo *TInfo) { 462 QualType BaseType = TInfo->getType(); 463 464 // C++ [class.union]p1: 465 // A union shall not have base classes. 466 if (Class->isUnion()) { 467 Diag(Class->getLocation(), diag::err_base_clause_on_union) 468 << SpecifierRange; 469 return 0; 470 } 471 472 if (BaseType->isDependentType()) 473 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 474 Class->getTagKind() == TTK_Class, 475 Access, TInfo); 476 477 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 478 479 // Base specifiers must be record types. 480 if (!BaseType->isRecordType()) { 481 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 482 return 0; 483 } 484 485 // C++ [class.union]p1: 486 // A union shall not be used as a base class. 487 if (BaseType->isUnionType()) { 488 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 489 return 0; 490 } 491 492 // C++ [class.derived]p2: 493 // The class-name in a base-specifier shall not be an incompletely 494 // defined class. 495 if (RequireCompleteType(BaseLoc, BaseType, 496 PDiag(diag::err_incomplete_base_class) 497 << SpecifierRange)) { 498 Class->setInvalidDecl(); 499 return 0; 500 } 501 502 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 503 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 504 assert(BaseDecl && "Record type has no declaration"); 505 BaseDecl = BaseDecl->getDefinition(); 506 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 507 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 508 assert(CXXBaseDecl && "Base type is not a C++ type"); 509 510 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 511 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 512 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 513 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 514 << BaseType; 515 return 0; 516 } 517 518 if (BaseDecl->isInvalidDecl()) 519 Class->setInvalidDecl(); 520 521 // Create the base specifier. 522 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 523 Class->getTagKind() == TTK_Class, 524 Access, TInfo); 525} 526 527/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 528/// one entry in the base class list of a class specifier, for 529/// example: 530/// class foo : public bar, virtual private baz { 531/// 'public bar' and 'virtual private baz' are each base-specifiers. 532BaseResult 533Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 534 bool Virtual, AccessSpecifier Access, 535 ParsedType basetype, SourceLocation BaseLoc) { 536 if (!classdecl) 537 return true; 538 539 AdjustDeclIfTemplate(classdecl); 540 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 541 if (!Class) 542 return true; 543 544 TypeSourceInfo *TInfo = 0; 545 GetTypeFromParser(basetype, &TInfo); 546 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 547 Virtual, Access, TInfo)) 548 return BaseSpec; 549 550 return true; 551} 552 553/// \brief Performs the actual work of attaching the given base class 554/// specifiers to a C++ class. 555bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 556 unsigned NumBases) { 557 if (NumBases == 0) 558 return false; 559 560 // Used to keep track of which base types we have already seen, so 561 // that we can properly diagnose redundant direct base types. Note 562 // that the key is always the unqualified canonical type of the base 563 // class. 564 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 565 566 // Copy non-redundant base specifiers into permanent storage. 567 unsigned NumGoodBases = 0; 568 bool Invalid = false; 569 for (unsigned idx = 0; idx < NumBases; ++idx) { 570 QualType NewBaseType 571 = Context.getCanonicalType(Bases[idx]->getType()); 572 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 573 if (!Class->hasObjectMember()) { 574 if (const RecordType *FDTTy = 575 NewBaseType.getTypePtr()->getAs<RecordType>()) 576 if (FDTTy->getDecl()->hasObjectMember()) 577 Class->setHasObjectMember(true); 578 } 579 580 if (KnownBaseTypes[NewBaseType]) { 581 // C++ [class.mi]p3: 582 // A class shall not be specified as a direct base class of a 583 // derived class more than once. 584 Diag(Bases[idx]->getSourceRange().getBegin(), 585 diag::err_duplicate_base_class) 586 << KnownBaseTypes[NewBaseType]->getType() 587 << Bases[idx]->getSourceRange(); 588 589 // Delete the duplicate base class specifier; we're going to 590 // overwrite its pointer later. 591 Context.Deallocate(Bases[idx]); 592 593 Invalid = true; 594 } else { 595 // Okay, add this new base class. 596 KnownBaseTypes[NewBaseType] = Bases[idx]; 597 Bases[NumGoodBases++] = Bases[idx]; 598 } 599 } 600 601 // Attach the remaining base class specifiers to the derived class. 602 Class->setBases(Bases, NumGoodBases); 603 604 // Delete the remaining (good) base class specifiers, since their 605 // data has been copied into the CXXRecordDecl. 606 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 607 Context.Deallocate(Bases[idx]); 608 609 return Invalid; 610} 611 612/// ActOnBaseSpecifiers - Attach the given base specifiers to the 613/// class, after checking whether there are any duplicate base 614/// classes. 615void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 616 unsigned NumBases) { 617 if (!ClassDecl || !Bases || !NumBases) 618 return; 619 620 AdjustDeclIfTemplate(ClassDecl); 621 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 622 (CXXBaseSpecifier**)(Bases), NumBases); 623} 624 625static CXXRecordDecl *GetClassForType(QualType T) { 626 if (const RecordType *RT = T->getAs<RecordType>()) 627 return cast<CXXRecordDecl>(RT->getDecl()); 628 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 629 return ICT->getDecl(); 630 else 631 return 0; 632} 633 634/// \brief Determine whether the type \p Derived is a C++ class that is 635/// derived from the type \p Base. 636bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 637 if (!getLangOptions().CPlusPlus) 638 return false; 639 640 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 641 if (!DerivedRD) 642 return false; 643 644 CXXRecordDecl *BaseRD = GetClassForType(Base); 645 if (!BaseRD) 646 return false; 647 648 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 649 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 650} 651 652/// \brief Determine whether the type \p Derived is a C++ class that is 653/// derived from the type \p Base. 654bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 655 if (!getLangOptions().CPlusPlus) 656 return false; 657 658 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 659 if (!DerivedRD) 660 return false; 661 662 CXXRecordDecl *BaseRD = GetClassForType(Base); 663 if (!BaseRD) 664 return false; 665 666 return DerivedRD->isDerivedFrom(BaseRD, Paths); 667} 668 669void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 670 CXXCastPath &BasePathArray) { 671 assert(BasePathArray.empty() && "Base path array must be empty!"); 672 assert(Paths.isRecordingPaths() && "Must record paths!"); 673 674 const CXXBasePath &Path = Paths.front(); 675 676 // We first go backward and check if we have a virtual base. 677 // FIXME: It would be better if CXXBasePath had the base specifier for 678 // the nearest virtual base. 679 unsigned Start = 0; 680 for (unsigned I = Path.size(); I != 0; --I) { 681 if (Path[I - 1].Base->isVirtual()) { 682 Start = I - 1; 683 break; 684 } 685 } 686 687 // Now add all bases. 688 for (unsigned I = Start, E = Path.size(); I != E; ++I) 689 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 690} 691 692/// \brief Determine whether the given base path includes a virtual 693/// base class. 694bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 695 for (CXXCastPath::const_iterator B = BasePath.begin(), 696 BEnd = BasePath.end(); 697 B != BEnd; ++B) 698 if ((*B)->isVirtual()) 699 return true; 700 701 return false; 702} 703 704/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 705/// conversion (where Derived and Base are class types) is 706/// well-formed, meaning that the conversion is unambiguous (and 707/// that all of the base classes are accessible). Returns true 708/// and emits a diagnostic if the code is ill-formed, returns false 709/// otherwise. Loc is the location where this routine should point to 710/// if there is an error, and Range is the source range to highlight 711/// if there is an error. 712bool 713Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 714 unsigned InaccessibleBaseID, 715 unsigned AmbigiousBaseConvID, 716 SourceLocation Loc, SourceRange Range, 717 DeclarationName Name, 718 CXXCastPath *BasePath) { 719 // First, determine whether the path from Derived to Base is 720 // ambiguous. This is slightly more expensive than checking whether 721 // the Derived to Base conversion exists, because here we need to 722 // explore multiple paths to determine if there is an ambiguity. 723 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 724 /*DetectVirtual=*/false); 725 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 726 assert(DerivationOkay && 727 "Can only be used with a derived-to-base conversion"); 728 (void)DerivationOkay; 729 730 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 731 if (InaccessibleBaseID) { 732 // Check that the base class can be accessed. 733 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 734 InaccessibleBaseID)) { 735 case AR_inaccessible: 736 return true; 737 case AR_accessible: 738 case AR_dependent: 739 case AR_delayed: 740 break; 741 } 742 } 743 744 // Build a base path if necessary. 745 if (BasePath) 746 BuildBasePathArray(Paths, *BasePath); 747 return false; 748 } 749 750 // We know that the derived-to-base conversion is ambiguous, and 751 // we're going to produce a diagnostic. Perform the derived-to-base 752 // search just one more time to compute all of the possible paths so 753 // that we can print them out. This is more expensive than any of 754 // the previous derived-to-base checks we've done, but at this point 755 // performance isn't as much of an issue. 756 Paths.clear(); 757 Paths.setRecordingPaths(true); 758 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 759 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 760 (void)StillOkay; 761 762 // Build up a textual representation of the ambiguous paths, e.g., 763 // D -> B -> A, that will be used to illustrate the ambiguous 764 // conversions in the diagnostic. We only print one of the paths 765 // to each base class subobject. 766 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 767 768 Diag(Loc, AmbigiousBaseConvID) 769 << Derived << Base << PathDisplayStr << Range << Name; 770 return true; 771} 772 773bool 774Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 775 SourceLocation Loc, SourceRange Range, 776 CXXCastPath *BasePath, 777 bool IgnoreAccess) { 778 return CheckDerivedToBaseConversion(Derived, Base, 779 IgnoreAccess ? 0 780 : diag::err_upcast_to_inaccessible_base, 781 diag::err_ambiguous_derived_to_base_conv, 782 Loc, Range, DeclarationName(), 783 BasePath); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 823Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 824 SourceLocation ASLoc, 825 SourceLocation ColonLoc) { 826 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 827 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 828 ASLoc, ColonLoc); 829 CurContext->addHiddenDecl(ASDecl); 830 return ASDecl; 831} 832 833/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 834/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 835/// bitfield width if there is one and 'InitExpr' specifies the initializer if 836/// any. 837Decl * 838Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 839 MultiTemplateParamsArg TemplateParameterLists, 840 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 841 bool Deleted) { 842 const DeclSpec &DS = D.getDeclSpec(); 843 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 844 DeclarationName Name = NameInfo.getName(); 845 SourceLocation Loc = NameInfo.getLoc(); 846 847 // 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 1059 // definition. [Note: if the constructor’s class contains a member 1060 // with the same name as a direct or virtual base class of the 1061 // class, a mem-initializer-id naming the member or base class and 1062 // composed 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 // FIXME: Handle members of an anonymous union. 1074 1075 if (Member) 1076 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1077 LParenLoc, RParenLoc); 1078 } 1079 // It didn't name a member, so see if it names a class. 1080 QualType BaseType; 1081 TypeSourceInfo *TInfo = 0; 1082 1083 if (TemplateTypeTy) { 1084 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1085 } else { 1086 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1087 LookupParsedName(R, S, &SS); 1088 1089 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1090 if (!TyD) { 1091 if (R.isAmbiguous()) return true; 1092 1093 // We don't want access-control diagnostics here. 1094 R.suppressDiagnostics(); 1095 1096 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1097 bool NotUnknownSpecialization = false; 1098 DeclContext *DC = computeDeclContext(SS, false); 1099 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1100 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1101 1102 if (!NotUnknownSpecialization) { 1103 // When the scope specifier can refer to a member of an unknown 1104 // specialization, we take it as a type name. 1105 BaseType = CheckTypenameType(ETK_None, 1106 (NestedNameSpecifier *)SS.getScopeRep(), 1107 *MemberOrBase, SourceLocation(), 1108 SS.getRange(), IdLoc); 1109 if (BaseType.isNull()) 1110 return true; 1111 1112 R.clear(); 1113 R.setLookupName(MemberOrBase); 1114 } 1115 } 1116 1117 // If no results were found, try to correct typos. 1118 if (R.empty() && BaseType.isNull() && 1119 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1120 R.isSingleResult()) { 1121 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1122 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1123 // We have found a non-static data member with a similar 1124 // name to what was typed; complain and initialize that 1125 // member. 1126 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1127 << MemberOrBase << true << R.getLookupName() 1128 << FixItHint::CreateReplacement(R.getNameLoc(), 1129 R.getLookupName().getAsString()); 1130 Diag(Member->getLocation(), diag::note_previous_decl) 1131 << Member->getDeclName(); 1132 1133 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1134 LParenLoc, RParenLoc); 1135 } 1136 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1137 const CXXBaseSpecifier *DirectBaseSpec; 1138 const CXXBaseSpecifier *VirtualBaseSpec; 1139 if (FindBaseInitializer(*this, ClassDecl, 1140 Context.getTypeDeclType(Type), 1141 DirectBaseSpec, VirtualBaseSpec)) { 1142 // We have found a direct or virtual base class with a 1143 // similar name to what was typed; complain and initialize 1144 // that base class. 1145 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1146 << MemberOrBase << false << R.getLookupName() 1147 << FixItHint::CreateReplacement(R.getNameLoc(), 1148 R.getLookupName().getAsString()); 1149 1150 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1151 : VirtualBaseSpec; 1152 Diag(BaseSpec->getSourceRange().getBegin(), 1153 diag::note_base_class_specified_here) 1154 << BaseSpec->getType() 1155 << BaseSpec->getSourceRange(); 1156 1157 TyD = Type; 1158 } 1159 } 1160 } 1161 1162 if (!TyD && BaseType.isNull()) { 1163 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1164 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1165 return true; 1166 } 1167 } 1168 1169 if (BaseType.isNull()) { 1170 BaseType = Context.getTypeDeclType(TyD); 1171 if (SS.isSet()) { 1172 NestedNameSpecifier *Qualifier = 1173 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1174 1175 // FIXME: preserve source range information 1176 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1177 } 1178 } 1179 } 1180 1181 if (!TInfo) 1182 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1183 1184 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1185 LParenLoc, RParenLoc, ClassDecl); 1186} 1187 1188/// Checks an initializer expression for use of uninitialized fields, such as 1189/// containing the field that is being initialized. Returns true if there is an 1190/// uninitialized field was used an updates the SourceLocation parameter; false 1191/// otherwise. 1192static bool InitExprContainsUninitializedFields(const Stmt *S, 1193 const FieldDecl *LhsField, 1194 SourceLocation *L) { 1195 if (isa<CallExpr>(S)) { 1196 // Do not descend into function calls or constructors, as the use 1197 // of an uninitialized field may be valid. One would have to inspect 1198 // the contents of the function/ctor to determine if it is safe or not. 1199 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1200 // may be safe, depending on what the function/ctor does. 1201 return false; 1202 } 1203 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1204 const NamedDecl *RhsField = ME->getMemberDecl(); 1205 1206 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1207 // The member expression points to a static data member. 1208 assert(VD->isStaticDataMember() && 1209 "Member points to non-static data member!"); 1210 (void)VD; 1211 return false; 1212 } 1213 1214 if (isa<EnumConstantDecl>(RhsField)) { 1215 // The member expression points to an enum. 1216 return false; 1217 } 1218 1219 if (RhsField == LhsField) { 1220 // Initializing a field with itself. Throw a warning. 1221 // But wait; there are exceptions! 1222 // Exception #1: The field may not belong to this record. 1223 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1224 const Expr *base = ME->getBase(); 1225 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1226 // Even though the field matches, it does not belong to this record. 1227 return false; 1228 } 1229 // None of the exceptions triggered; return true to indicate an 1230 // uninitialized field was used. 1231 *L = ME->getMemberLoc(); 1232 return true; 1233 } 1234 } else if (isa<SizeOfAlignOfExpr>(S)) { 1235 // sizeof/alignof doesn't reference contents, do not warn. 1236 return false; 1237 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1238 // address-of doesn't reference contents (the pointer may be dereferenced 1239 // in the same expression but it would be rare; and weird). 1240 if (UOE->getOpcode() == UO_AddrOf) 1241 return false; 1242 } 1243 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1244 it != e; ++it) { 1245 if (!*it) { 1246 // An expression such as 'member(arg ?: "")' may trigger this. 1247 continue; 1248 } 1249 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1250 return true; 1251 } 1252 return false; 1253} 1254 1255MemInitResult 1256Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1257 unsigned NumArgs, SourceLocation IdLoc, 1258 SourceLocation LParenLoc, 1259 SourceLocation RParenLoc) { 1260 if (Member->isInvalidDecl()) 1261 return true; 1262 1263 // Diagnose value-uses of fields to initialize themselves, e.g. 1264 // foo(foo) 1265 // where foo is not also a parameter to the constructor. 1266 // TODO: implement -Wuninitialized and fold this into that framework. 1267 for (unsigned i = 0; i < NumArgs; ++i) { 1268 SourceLocation L; 1269 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1270 // FIXME: Return true in the case when other fields are used before being 1271 // uninitialized. For example, let this field be the i'th field. When 1272 // initializing the i'th field, throw a warning if any of the >= i'th 1273 // fields are used, as they are not yet initialized. 1274 // Right now we are only handling the case where the i'th field uses 1275 // itself in its initializer. 1276 Diag(L, diag::warn_field_is_uninit); 1277 } 1278 } 1279 1280 bool HasDependentArg = false; 1281 for (unsigned i = 0; i < NumArgs; i++) 1282 HasDependentArg |= Args[i]->isTypeDependent(); 1283 1284 if (Member->getType()->isDependentType() || HasDependentArg) { 1285 // Can't check initialization for a member of dependent type or when 1286 // any of the arguments are type-dependent expressions. 1287 Expr *Init 1288 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1289 RParenLoc); 1290 1291 // Erase any temporaries within this evaluation context; we're not 1292 // going to track them in the AST, since we'll be rebuilding the 1293 // ASTs during template instantiation. 1294 ExprTemporaries.erase( 1295 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1296 ExprTemporaries.end()); 1297 1298 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1299 LParenLoc, 1300 Init, 1301 RParenLoc); 1302 1303 } 1304 1305 // Initialize the member. 1306 InitializedEntity MemberEntity = 1307 InitializedEntity::InitializeMember(Member, 0); 1308 InitializationKind Kind = 1309 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1310 1311 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1312 1313 ExprResult MemberInit = 1314 InitSeq.Perform(*this, MemberEntity, Kind, 1315 MultiExprArg(*this, Args, NumArgs), 0); 1316 if (MemberInit.isInvalid()) 1317 return true; 1318 1319 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1320 1321 // C++0x [class.base.init]p7: 1322 // The initialization of each base and member constitutes a 1323 // full-expression. 1324 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1325 if (MemberInit.isInvalid()) 1326 return true; 1327 1328 // If we are in a dependent context, template instantiation will 1329 // perform this type-checking again. Just save the arguments that we 1330 // received in a ParenListExpr. 1331 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1332 // of the information that we have about the member 1333 // initializer. However, deconstructing the ASTs is a dicey process, 1334 // and this approach is far more likely to get the corner cases right. 1335 if (CurContext->isDependentContext()) { 1336 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1337 RParenLoc); 1338 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1339 LParenLoc, 1340 Init, 1341 RParenLoc); 1342 } 1343 1344 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1345 LParenLoc, 1346 MemberInit.get(), 1347 RParenLoc); 1348} 1349 1350MemInitResult 1351Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1352 Expr **Args, unsigned NumArgs, 1353 SourceLocation LParenLoc, SourceLocation RParenLoc, 1354 CXXRecordDecl *ClassDecl) { 1355 bool HasDependentArg = false; 1356 for (unsigned i = 0; i < NumArgs; i++) 1357 HasDependentArg |= Args[i]->isTypeDependent(); 1358 1359 SourceLocation BaseLoc 1360 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1361 1362 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1363 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1364 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1365 1366 // C++ [class.base.init]p2: 1367 // [...] Unless the mem-initializer-id names a nonstatic data 1368 // member of the constructor’s class or a direct or virtual base 1369 // of that class, the mem-initializer is ill-formed. A 1370 // mem-initializer-list can initialize a base class using any 1371 // name that denotes that base class type. 1372 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1373 1374 // Check for direct and virtual base classes. 1375 const CXXBaseSpecifier *DirectBaseSpec = 0; 1376 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1377 if (!Dependent) { 1378 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1379 VirtualBaseSpec); 1380 1381 // C++ [base.class.init]p2: 1382 // Unless the mem-initializer-id names a nonstatic data member of the 1383 // constructor's class or a direct or virtual base of that class, the 1384 // mem-initializer is ill-formed. 1385 if (!DirectBaseSpec && !VirtualBaseSpec) { 1386 // If the class has any dependent bases, then it's possible that 1387 // one of those types will resolve to the same type as 1388 // BaseType. Therefore, just treat this as a dependent base 1389 // class initialization. FIXME: Should we try to check the 1390 // initialization anyway? It seems odd. 1391 if (ClassDecl->hasAnyDependentBases()) 1392 Dependent = true; 1393 else 1394 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1395 << BaseType << Context.getTypeDeclType(ClassDecl) 1396 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1397 } 1398 } 1399 1400 if (Dependent) { 1401 // Can't check initialization for a base of dependent type or when 1402 // any of the arguments are type-dependent expressions. 1403 ExprResult BaseInit 1404 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1405 RParenLoc)); 1406 1407 // Erase any temporaries within this evaluation context; we're not 1408 // going to track them in the AST, since we'll be rebuilding the 1409 // ASTs during template instantiation. 1410 ExprTemporaries.erase( 1411 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1412 ExprTemporaries.end()); 1413 1414 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1415 /*IsVirtual=*/false, 1416 LParenLoc, 1417 BaseInit.takeAs<Expr>(), 1418 RParenLoc); 1419 } 1420 1421 // C++ [base.class.init]p2: 1422 // If a mem-initializer-id is ambiguous because it designates both 1423 // a direct non-virtual base class and an inherited virtual base 1424 // class, the mem-initializer is ill-formed. 1425 if (DirectBaseSpec && VirtualBaseSpec) 1426 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1427 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1428 1429 CXXBaseSpecifier *BaseSpec 1430 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1431 if (!BaseSpec) 1432 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1433 1434 // Initialize the base. 1435 InitializedEntity BaseEntity = 1436 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1437 InitializationKind Kind = 1438 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1439 1440 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1441 1442 ExprResult BaseInit = 1443 InitSeq.Perform(*this, BaseEntity, Kind, 1444 MultiExprArg(*this, Args, NumArgs), 0); 1445 if (BaseInit.isInvalid()) 1446 return true; 1447 1448 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1449 1450 // C++0x [class.base.init]p7: 1451 // The initialization of each base and member constitutes a 1452 // full-expression. 1453 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1454 if (BaseInit.isInvalid()) 1455 return true; 1456 1457 // If we are in a dependent context, template instantiation will 1458 // perform this type-checking again. Just save the arguments that we 1459 // received in a ParenListExpr. 1460 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1461 // of the information that we have about the base 1462 // initializer. However, deconstructing the ASTs is a dicey process, 1463 // and this approach is far more likely to get the corner cases right. 1464 if (CurContext->isDependentContext()) { 1465 ExprResult Init 1466 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1467 RParenLoc)); 1468 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1469 BaseSpec->isVirtual(), 1470 LParenLoc, 1471 Init.takeAs<Expr>(), 1472 RParenLoc); 1473 } 1474 1475 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1476 BaseSpec->isVirtual(), 1477 LParenLoc, 1478 BaseInit.takeAs<Expr>(), 1479 RParenLoc); 1480} 1481 1482/// ImplicitInitializerKind - How an implicit base or member initializer should 1483/// initialize its base or member. 1484enum ImplicitInitializerKind { 1485 IIK_Default, 1486 IIK_Copy, 1487 IIK_Move 1488}; 1489 1490static bool 1491BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1492 ImplicitInitializerKind ImplicitInitKind, 1493 CXXBaseSpecifier *BaseSpec, 1494 bool IsInheritedVirtualBase, 1495 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1496 InitializedEntity InitEntity 1497 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1498 IsInheritedVirtualBase); 1499 1500 ExprResult BaseInit; 1501 1502 switch (ImplicitInitKind) { 1503 case IIK_Default: { 1504 InitializationKind InitKind 1505 = InitializationKind::CreateDefault(Constructor->getLocation()); 1506 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1507 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1508 MultiExprArg(SemaRef, 0, 0)); 1509 break; 1510 } 1511 1512 case IIK_Copy: { 1513 ParmVarDecl *Param = Constructor->getParamDecl(0); 1514 QualType ParamType = Param->getType().getNonReferenceType(); 1515 1516 Expr *CopyCtorArg = 1517 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1518 Constructor->getLocation(), ParamType, 0); 1519 1520 // Cast to the base class to avoid ambiguities. 1521 QualType ArgTy = 1522 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1523 ParamType.getQualifiers()); 1524 1525 CXXCastPath BasePath; 1526 BasePath.push_back(BaseSpec); 1527 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1528 CK_UncheckedDerivedToBase, 1529 VK_LValue, &BasePath); 1530 1531 InitializationKind InitKind 1532 = InitializationKind::CreateDirect(Constructor->getLocation(), 1533 SourceLocation(), SourceLocation()); 1534 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1535 &CopyCtorArg, 1); 1536 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1537 MultiExprArg(&CopyCtorArg, 1)); 1538 break; 1539 } 1540 1541 case IIK_Move: 1542 assert(false && "Unhandled initializer kind!"); 1543 } 1544 1545 if (BaseInit.isInvalid()) 1546 return true; 1547 1548 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1549 if (BaseInit.isInvalid()) 1550 return true; 1551 1552 CXXBaseInit = 1553 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1554 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1555 SourceLocation()), 1556 BaseSpec->isVirtual(), 1557 SourceLocation(), 1558 BaseInit.takeAs<Expr>(), 1559 SourceLocation()); 1560 1561 return false; 1562} 1563 1564static bool 1565BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1566 ImplicitInitializerKind ImplicitInitKind, 1567 FieldDecl *Field, 1568 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1569 if (Field->isInvalidDecl()) 1570 return true; 1571 1572 SourceLocation Loc = Constructor->getLocation(); 1573 1574 if (ImplicitInitKind == IIK_Copy) { 1575 ParmVarDecl *Param = Constructor->getParamDecl(0); 1576 QualType ParamType = Param->getType().getNonReferenceType(); 1577 1578 Expr *MemberExprBase = 1579 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1580 Loc, ParamType, 0); 1581 1582 // Build a reference to this field within the parameter. 1583 CXXScopeSpec SS; 1584 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1585 Sema::LookupMemberName); 1586 MemberLookup.addDecl(Field, AS_public); 1587 MemberLookup.resolveKind(); 1588 ExprResult CopyCtorArg 1589 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1590 ParamType, Loc, 1591 /*IsArrow=*/false, 1592 SS, 1593 /*FirstQualifierInScope=*/0, 1594 MemberLookup, 1595 /*TemplateArgs=*/0); 1596 if (CopyCtorArg.isInvalid()) 1597 return true; 1598 1599 // When the field we are copying is an array, create index variables for 1600 // each dimension of the array. We use these index variables to subscript 1601 // the source array, and other clients (e.g., CodeGen) will perform the 1602 // necessary iteration with these index variables. 1603 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1604 QualType BaseType = Field->getType(); 1605 QualType SizeType = SemaRef.Context.getSizeType(); 1606 while (const ConstantArrayType *Array 1607 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1608 // Create the iteration variable for this array index. 1609 IdentifierInfo *IterationVarName = 0; 1610 { 1611 llvm::SmallString<8> Str; 1612 llvm::raw_svector_ostream OS(Str); 1613 OS << "__i" << IndexVariables.size(); 1614 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1615 } 1616 VarDecl *IterationVar 1617 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1618 IterationVarName, SizeType, 1619 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1620 SC_None, SC_None); 1621 IndexVariables.push_back(IterationVar); 1622 1623 // Create a reference to the iteration variable. 1624 ExprResult IterationVarRef 1625 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1626 assert(!IterationVarRef.isInvalid() && 1627 "Reference to invented variable cannot fail!"); 1628 1629 // Subscript the array with this iteration variable. 1630 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1631 Loc, 1632 IterationVarRef.take(), 1633 Loc); 1634 if (CopyCtorArg.isInvalid()) 1635 return true; 1636 1637 BaseType = Array->getElementType(); 1638 } 1639 1640 // Construct the entity that we will be initializing. For an array, this 1641 // will be first element in the array, which may require several levels 1642 // of array-subscript entities. 1643 llvm::SmallVector<InitializedEntity, 4> Entities; 1644 Entities.reserve(1 + IndexVariables.size()); 1645 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1646 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1647 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1648 0, 1649 Entities.back())); 1650 1651 // Direct-initialize to use the copy constructor. 1652 InitializationKind InitKind = 1653 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1654 1655 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1656 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1657 &CopyCtorArgE, 1); 1658 1659 ExprResult MemberInit 1660 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1661 MultiExprArg(&CopyCtorArgE, 1)); 1662 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1663 if (MemberInit.isInvalid()) 1664 return true; 1665 1666 CXXMemberInit 1667 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1668 MemberInit.takeAs<Expr>(), Loc, 1669 IndexVariables.data(), 1670 IndexVariables.size()); 1671 return false; 1672 } 1673 1674 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1675 1676 QualType FieldBaseElementType = 1677 SemaRef.Context.getBaseElementType(Field->getType()); 1678 1679 if (FieldBaseElementType->isRecordType()) { 1680 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1681 InitializationKind InitKind = 1682 InitializationKind::CreateDefault(Loc); 1683 1684 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1685 ExprResult MemberInit = 1686 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1687 if (MemberInit.isInvalid()) 1688 return true; 1689 1690 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1691 if (MemberInit.isInvalid()) 1692 return true; 1693 1694 CXXMemberInit = 1695 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1696 Field, Loc, Loc, 1697 MemberInit.get(), 1698 Loc); 1699 return false; 1700 } 1701 1702 if (FieldBaseElementType->isReferenceType()) { 1703 SemaRef.Diag(Constructor->getLocation(), 1704 diag::err_uninitialized_member_in_ctor) 1705 << (int)Constructor->isImplicit() 1706 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1707 << 0 << Field->getDeclName(); 1708 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1709 return true; 1710 } 1711 1712 if (FieldBaseElementType.isConstQualified()) { 1713 SemaRef.Diag(Constructor->getLocation(), 1714 diag::err_uninitialized_member_in_ctor) 1715 << (int)Constructor->isImplicit() 1716 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1717 << 1 << Field->getDeclName(); 1718 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1719 return true; 1720 } 1721 1722 // Nothing to initialize. 1723 CXXMemberInit = 0; 1724 return false; 1725} 1726 1727namespace { 1728struct BaseAndFieldInfo { 1729 Sema &S; 1730 CXXConstructorDecl *Ctor; 1731 bool AnyErrorsInInits; 1732 ImplicitInitializerKind IIK; 1733 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1734 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1735 1736 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1737 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1738 // FIXME: Handle implicit move constructors. 1739 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1740 IIK = IIK_Copy; 1741 else 1742 IIK = IIK_Default; 1743 } 1744}; 1745} 1746 1747static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1748 FieldDecl *Top, FieldDecl *Field, 1749 CXXBaseOrMemberInitializer *Init) { 1750 // If the member doesn't need to be initialized, Init will still be null. 1751 if (!Init) 1752 return; 1753 1754 Info.AllToInit.push_back(Init); 1755 if (Field != Top) { 1756 Init->setMember(Top); 1757 Init->setAnonUnionMember(Field); 1758 } 1759} 1760 1761static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1762 FieldDecl *Top, FieldDecl *Field) { 1763 1764 // Overwhelmingly common case: we have a direct initializer for this field. 1765 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1766 RecordFieldInitializer(Info, Top, Field, Init); 1767 return false; 1768 } 1769 1770 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1771 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1772 assert(FieldClassType && "anonymous struct/union without record type"); 1773 CXXRecordDecl *FieldClassDecl 1774 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1775 1776 // Even though union members never have non-trivial default 1777 // constructions in C++03, we still build member initializers for aggregate 1778 // record types which can be union members, and C++0x allows non-trivial 1779 // default constructors for union members, so we ensure that only one 1780 // member is initialized for these. 1781 if (FieldClassDecl->isUnion()) { 1782 // First check for an explicit initializer for one field. 1783 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1784 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1785 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1786 RecordFieldInitializer(Info, Top, *FA, Init); 1787 1788 // Once we've initialized a field of an anonymous union, the union 1789 // field in the class is also initialized, so exit immediately. 1790 return false; 1791 } else if ((*FA)->isAnonymousStructOrUnion()) { 1792 if (CollectFieldInitializer(Info, Top, *FA)) 1793 return true; 1794 } 1795 } 1796 1797 // Fallthrough and construct a default initializer for the union as 1798 // a whole, which can call its default constructor if such a thing exists 1799 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1800 // behavior going forward with C++0x, when anonymous unions there are 1801 // finalized, we should revisit this. 1802 } else { 1803 // For structs, we simply descend through to initialize all members where 1804 // necessary. 1805 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1806 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1807 if (CollectFieldInitializer(Info, Top, *FA)) 1808 return true; 1809 } 1810 } 1811 } 1812 1813 // Don't try to build an implicit initializer if there were semantic 1814 // errors in any of the initializers (and therefore we might be 1815 // missing some that the user actually wrote). 1816 if (Info.AnyErrorsInInits) 1817 return false; 1818 1819 CXXBaseOrMemberInitializer *Init = 0; 1820 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1821 return true; 1822 1823 RecordFieldInitializer(Info, Top, Field, Init); 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->getMember()] = 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 bool MemberMaybeAnon = false) { 1964 if (!Member->isMemberInitializer()) 1965 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1966 1967 // For fields injected into the class via declaration of an anonymous union, 1968 // use its anonymous union class declaration as the unique key. 1969 FieldDecl *Field = Member->getMember(); 1970 1971 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1972 // data member of the class. Data member used in the initializer list is 1973 // in AnonUnionMember field. 1974 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1975 Field = Member->getAnonUnionMember(); 1976 1977 // If the field is a member of an anonymous struct or union, our key 1978 // is the anonymous record decl that's a direct child of the class. 1979 RecordDecl *RD = Field->getParent(); 1980 if (RD->isAnonymousStructOrUnion()) { 1981 while (true) { 1982 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1983 if (Parent->isAnonymousStructOrUnion()) 1984 RD = Parent; 1985 else 1986 break; 1987 } 1988 1989 return static_cast<void *>(RD); 1990 } 1991 1992 return static_cast<void *>(Field); 1993} 1994 1995static void 1996DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1997 const CXXConstructorDecl *Constructor, 1998 CXXBaseOrMemberInitializer **Inits, 1999 unsigned NumInits) { 2000 if (Constructor->getDeclContext()->isDependentContext()) 2001 return; 2002 2003 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2004 == Diagnostic::Ignored) 2005 return; 2006 2007 // Build the list of bases and members in the order that they'll 2008 // actually be initialized. The explicit initializers should be in 2009 // this same order but may be missing things. 2010 llvm::SmallVector<const void*, 32> IdealInitKeys; 2011 2012 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2013 2014 // 1. Virtual bases. 2015 for (CXXRecordDecl::base_class_const_iterator VBase = 2016 ClassDecl->vbases_begin(), 2017 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2018 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2019 2020 // 2. Non-virtual bases. 2021 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2022 E = ClassDecl->bases_end(); Base != E; ++Base) { 2023 if (Base->isVirtual()) 2024 continue; 2025 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2026 } 2027 2028 // 3. Direct fields. 2029 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2030 E = ClassDecl->field_end(); Field != E; ++Field) 2031 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2032 2033 unsigned NumIdealInits = IdealInitKeys.size(); 2034 unsigned IdealIndex = 0; 2035 2036 CXXBaseOrMemberInitializer *PrevInit = 0; 2037 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2038 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2039 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2040 2041 // Scan forward to try to find this initializer in the idealized 2042 // initializers list. 2043 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2044 if (InitKey == IdealInitKeys[IdealIndex]) 2045 break; 2046 2047 // If we didn't find this initializer, it must be because we 2048 // scanned past it on a previous iteration. That can only 2049 // happen if we're out of order; emit a warning. 2050 if (IdealIndex == NumIdealInits && PrevInit) { 2051 Sema::SemaDiagnosticBuilder D = 2052 SemaRef.Diag(PrevInit->getSourceLocation(), 2053 diag::warn_initializer_out_of_order); 2054 2055 if (PrevInit->isMemberInitializer()) 2056 D << 0 << PrevInit->getMember()->getDeclName(); 2057 else 2058 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2059 2060 if (Init->isMemberInitializer()) 2061 D << 0 << Init->getMember()->getDeclName(); 2062 else 2063 D << 1 << Init->getBaseClassInfo()->getType(); 2064 2065 // Move back to the initializer's location in the ideal list. 2066 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2067 if (InitKey == IdealInitKeys[IdealIndex]) 2068 break; 2069 2070 assert(IdealIndex != NumIdealInits && 2071 "initializer not found in initializer list"); 2072 } 2073 2074 PrevInit = Init; 2075 } 2076} 2077 2078namespace { 2079bool CheckRedundantInit(Sema &S, 2080 CXXBaseOrMemberInitializer *Init, 2081 CXXBaseOrMemberInitializer *&PrevInit) { 2082 if (!PrevInit) { 2083 PrevInit = Init; 2084 return false; 2085 } 2086 2087 if (FieldDecl *Field = Init->getMember()) 2088 S.Diag(Init->getSourceLocation(), 2089 diag::err_multiple_mem_initialization) 2090 << Field->getDeclName() 2091 << Init->getSourceRange(); 2092 else { 2093 Type *BaseClass = Init->getBaseClass(); 2094 assert(BaseClass && "neither field nor base"); 2095 S.Diag(Init->getSourceLocation(), 2096 diag::err_multiple_base_initialization) 2097 << QualType(BaseClass, 0) 2098 << Init->getSourceRange(); 2099 } 2100 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2101 << 0 << PrevInit->getSourceRange(); 2102 2103 return true; 2104} 2105 2106typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2107typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2108 2109bool CheckRedundantUnionInit(Sema &S, 2110 CXXBaseOrMemberInitializer *Init, 2111 RedundantUnionMap &Unions) { 2112 FieldDecl *Field = Init->getMember(); 2113 RecordDecl *Parent = Field->getParent(); 2114 if (!Parent->isAnonymousStructOrUnion()) 2115 return false; 2116 2117 NamedDecl *Child = Field; 2118 do { 2119 if (Parent->isUnion()) { 2120 UnionEntry &En = Unions[Parent]; 2121 if (En.first && En.first != Child) { 2122 S.Diag(Init->getSourceLocation(), 2123 diag::err_multiple_mem_union_initialization) 2124 << Field->getDeclName() 2125 << Init->getSourceRange(); 2126 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2127 << 0 << En.second->getSourceRange(); 2128 return true; 2129 } else if (!En.first) { 2130 En.first = Child; 2131 En.second = Init; 2132 } 2133 } 2134 2135 Child = Parent; 2136 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2137 } while (Parent->isAnonymousStructOrUnion()); 2138 2139 return false; 2140} 2141} 2142 2143/// ActOnMemInitializers - Handle the member initializers for a constructor. 2144void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2145 SourceLocation ColonLoc, 2146 MemInitTy **meminits, unsigned NumMemInits, 2147 bool AnyErrors) { 2148 if (!ConstructorDecl) 2149 return; 2150 2151 AdjustDeclIfTemplate(ConstructorDecl); 2152 2153 CXXConstructorDecl *Constructor 2154 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2155 2156 if (!Constructor) { 2157 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2158 return; 2159 } 2160 2161 CXXBaseOrMemberInitializer **MemInits = 2162 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2163 2164 // Mapping for the duplicate initializers check. 2165 // For member initializers, this is keyed with a FieldDecl*. 2166 // For base initializers, this is keyed with a Type*. 2167 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2168 2169 // Mapping for the inconsistent anonymous-union initializers check. 2170 RedundantUnionMap MemberUnions; 2171 2172 bool HadError = false; 2173 for (unsigned i = 0; i < NumMemInits; i++) { 2174 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2175 2176 // Set the source order index. 2177 Init->setSourceOrder(i); 2178 2179 if (Init->isMemberInitializer()) { 2180 FieldDecl *Field = Init->getMember(); 2181 if (CheckRedundantInit(*this, Init, Members[Field]) || 2182 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2183 HadError = true; 2184 } else { 2185 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2186 if (CheckRedundantInit(*this, Init, Members[Key])) 2187 HadError = true; 2188 } 2189 } 2190 2191 if (HadError) 2192 return; 2193 2194 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2195 2196 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2197} 2198 2199void 2200Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2201 CXXRecordDecl *ClassDecl) { 2202 // Ignore dependent contexts. 2203 if (ClassDecl->isDependentContext()) 2204 return; 2205 2206 // FIXME: all the access-control diagnostics are positioned on the 2207 // field/base declaration. That's probably good; that said, the 2208 // user might reasonably want to know why the destructor is being 2209 // emitted, and we currently don't say. 2210 2211 // Non-static data members. 2212 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2213 E = ClassDecl->field_end(); I != E; ++I) { 2214 FieldDecl *Field = *I; 2215 if (Field->isInvalidDecl()) 2216 continue; 2217 QualType FieldType = Context.getBaseElementType(Field->getType()); 2218 2219 const RecordType* RT = FieldType->getAs<RecordType>(); 2220 if (!RT) 2221 continue; 2222 2223 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2224 if (FieldClassDecl->hasTrivialDestructor()) 2225 continue; 2226 2227 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2228 CheckDestructorAccess(Field->getLocation(), Dtor, 2229 PDiag(diag::err_access_dtor_field) 2230 << Field->getDeclName() 2231 << FieldType); 2232 2233 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2234 } 2235 2236 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2237 2238 // Bases. 2239 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2240 E = ClassDecl->bases_end(); Base != E; ++Base) { 2241 // Bases are always records in a well-formed non-dependent class. 2242 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2243 2244 // Remember direct virtual bases. 2245 if (Base->isVirtual()) 2246 DirectVirtualBases.insert(RT); 2247 2248 // Ignore trivial destructors. 2249 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2250 if (BaseClassDecl->hasTrivialDestructor()) 2251 continue; 2252 2253 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2254 2255 // FIXME: caret should be on the start of the class name 2256 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2257 PDiag(diag::err_access_dtor_base) 2258 << Base->getType() 2259 << Base->getSourceRange()); 2260 2261 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2262 } 2263 2264 // Virtual bases. 2265 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2266 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2267 2268 // Bases are always records in a well-formed non-dependent class. 2269 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2270 2271 // Ignore direct virtual bases. 2272 if (DirectVirtualBases.count(RT)) 2273 continue; 2274 2275 // Ignore trivial destructors. 2276 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2277 if (BaseClassDecl->hasTrivialDestructor()) 2278 continue; 2279 2280 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2281 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2282 PDiag(diag::err_access_dtor_vbase) 2283 << VBase->getType()); 2284 2285 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2286 } 2287} 2288 2289void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2290 if (!CDtorDecl) 2291 return; 2292 2293 if (CXXConstructorDecl *Constructor 2294 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2295 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2296} 2297 2298bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2299 unsigned DiagID, AbstractDiagSelID SelID) { 2300 if (SelID == -1) 2301 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2302 else 2303 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2304} 2305 2306bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2307 const PartialDiagnostic &PD) { 2308 if (!getLangOptions().CPlusPlus) 2309 return false; 2310 2311 if (const ArrayType *AT = Context.getAsArrayType(T)) 2312 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2313 2314 if (const PointerType *PT = T->getAs<PointerType>()) { 2315 // Find the innermost pointer type. 2316 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2317 PT = T; 2318 2319 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2320 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2321 } 2322 2323 const RecordType *RT = T->getAs<RecordType>(); 2324 if (!RT) 2325 return false; 2326 2327 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2328 2329 // We can't answer whether something is abstract until it has a 2330 // definition. If it's currently being defined, we'll walk back 2331 // over all the declarations when we have a full definition. 2332 const CXXRecordDecl *Def = RD->getDefinition(); 2333 if (!Def || Def->isBeingDefined()) 2334 return false; 2335 2336 if (!RD->isAbstract()) 2337 return false; 2338 2339 Diag(Loc, PD) << RD->getDeclName(); 2340 DiagnoseAbstractType(RD); 2341 2342 return true; 2343} 2344 2345void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2346 // Check if we've already emitted the list of pure virtual functions 2347 // for this class. 2348 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2349 return; 2350 2351 CXXFinalOverriderMap FinalOverriders; 2352 RD->getFinalOverriders(FinalOverriders); 2353 2354 // Keep a set of seen pure methods so we won't diagnose the same method 2355 // more than once. 2356 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2357 2358 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2359 MEnd = FinalOverriders.end(); 2360 M != MEnd; 2361 ++M) { 2362 for (OverridingMethods::iterator SO = M->second.begin(), 2363 SOEnd = M->second.end(); 2364 SO != SOEnd; ++SO) { 2365 // C++ [class.abstract]p4: 2366 // A class is abstract if it contains or inherits at least one 2367 // pure virtual function for which the final overrider is pure 2368 // virtual. 2369 2370 // 2371 if (SO->second.size() != 1) 2372 continue; 2373 2374 if (!SO->second.front().Method->isPure()) 2375 continue; 2376 2377 if (!SeenPureMethods.insert(SO->second.front().Method)) 2378 continue; 2379 2380 Diag(SO->second.front().Method->getLocation(), 2381 diag::note_pure_virtual_function) 2382 << SO->second.front().Method->getDeclName(); 2383 } 2384 } 2385 2386 if (!PureVirtualClassDiagSet) 2387 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2388 PureVirtualClassDiagSet->insert(RD); 2389} 2390 2391namespace { 2392struct AbstractUsageInfo { 2393 Sema &S; 2394 CXXRecordDecl *Record; 2395 CanQualType AbstractType; 2396 bool Invalid; 2397 2398 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2399 : S(S), Record(Record), 2400 AbstractType(S.Context.getCanonicalType( 2401 S.Context.getTypeDeclType(Record))), 2402 Invalid(false) {} 2403 2404 void DiagnoseAbstractType() { 2405 if (Invalid) return; 2406 S.DiagnoseAbstractType(Record); 2407 Invalid = true; 2408 } 2409 2410 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2411}; 2412 2413struct CheckAbstractUsage { 2414 AbstractUsageInfo &Info; 2415 const NamedDecl *Ctx; 2416 2417 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2418 : Info(Info), Ctx(Ctx) {} 2419 2420 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2421 switch (TL.getTypeLocClass()) { 2422#define ABSTRACT_TYPELOC(CLASS, PARENT) 2423#define TYPELOC(CLASS, PARENT) \ 2424 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2425#include "clang/AST/TypeLocNodes.def" 2426 } 2427 } 2428 2429 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2430 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2431 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2432 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2433 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2434 } 2435 } 2436 2437 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2438 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2439 } 2440 2441 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2442 // Visit the type parameters from a permissive context. 2443 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2444 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2445 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2446 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2447 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2448 // TODO: other template argument types? 2449 } 2450 } 2451 2452 // Visit pointee types from a permissive context. 2453#define CheckPolymorphic(Type) \ 2454 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2455 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2456 } 2457 CheckPolymorphic(PointerTypeLoc) 2458 CheckPolymorphic(ReferenceTypeLoc) 2459 CheckPolymorphic(MemberPointerTypeLoc) 2460 CheckPolymorphic(BlockPointerTypeLoc) 2461 2462 /// Handle all the types we haven't given a more specific 2463 /// implementation for above. 2464 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2465 // Every other kind of type that we haven't called out already 2466 // that has an inner type is either (1) sugar or (2) contains that 2467 // inner type in some way as a subobject. 2468 if (TypeLoc Next = TL.getNextTypeLoc()) 2469 return Visit(Next, Sel); 2470 2471 // If there's no inner type and we're in a permissive context, 2472 // don't diagnose. 2473 if (Sel == Sema::AbstractNone) return; 2474 2475 // Check whether the type matches the abstract type. 2476 QualType T = TL.getType(); 2477 if (T->isArrayType()) { 2478 Sel = Sema::AbstractArrayType; 2479 T = Info.S.Context.getBaseElementType(T); 2480 } 2481 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2482 if (CT != Info.AbstractType) return; 2483 2484 // It matched; do some magic. 2485 if (Sel == Sema::AbstractArrayType) { 2486 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2487 << T << TL.getSourceRange(); 2488 } else { 2489 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2490 << Sel << T << TL.getSourceRange(); 2491 } 2492 Info.DiagnoseAbstractType(); 2493 } 2494}; 2495 2496void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2497 Sema::AbstractDiagSelID Sel) { 2498 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2499} 2500 2501} 2502 2503/// Check for invalid uses of an abstract type in a method declaration. 2504static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2505 CXXMethodDecl *MD) { 2506 // No need to do the check on definitions, which require that 2507 // the return/param types be complete. 2508 if (MD->isThisDeclarationADefinition()) 2509 return; 2510 2511 // For safety's sake, just ignore it if we don't have type source 2512 // information. This should never happen for non-implicit methods, 2513 // but... 2514 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2515 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2516} 2517 2518/// Check for invalid uses of an abstract type within a class definition. 2519static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2520 CXXRecordDecl *RD) { 2521 for (CXXRecordDecl::decl_iterator 2522 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2523 Decl *D = *I; 2524 if (D->isImplicit()) continue; 2525 2526 // Methods and method templates. 2527 if (isa<CXXMethodDecl>(D)) { 2528 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2529 } else if (isa<FunctionTemplateDecl>(D)) { 2530 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2531 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2532 2533 // Fields and static variables. 2534 } else if (isa<FieldDecl>(D)) { 2535 FieldDecl *FD = cast<FieldDecl>(D); 2536 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2537 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2538 } else if (isa<VarDecl>(D)) { 2539 VarDecl *VD = cast<VarDecl>(D); 2540 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2541 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2542 2543 // Nested classes and class templates. 2544 } else if (isa<CXXRecordDecl>(D)) { 2545 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2546 } else if (isa<ClassTemplateDecl>(D)) { 2547 CheckAbstractClassUsage(Info, 2548 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2549 } 2550 } 2551} 2552 2553/// \brief Perform semantic checks on a class definition that has been 2554/// completing, introducing implicitly-declared members, checking for 2555/// abstract types, etc. 2556void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2557 if (!Record) 2558 return; 2559 2560 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2561 AbstractUsageInfo Info(*this, Record); 2562 CheckAbstractClassUsage(Info, Record); 2563 } 2564 2565 // If this is not an aggregate type and has no user-declared constructor, 2566 // complain about any non-static data members of reference or const scalar 2567 // type, since they will never get initializers. 2568 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2569 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2570 bool Complained = false; 2571 for (RecordDecl::field_iterator F = Record->field_begin(), 2572 FEnd = Record->field_end(); 2573 F != FEnd; ++F) { 2574 if (F->getType()->isReferenceType() || 2575 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2576 if (!Complained) { 2577 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2578 << Record->getTagKind() << Record; 2579 Complained = true; 2580 } 2581 2582 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2583 << F->getType()->isReferenceType() 2584 << F->getDeclName(); 2585 } 2586 } 2587 } 2588 2589 if (Record->isDynamicClass()) 2590 DynamicClasses.push_back(Record); 2591 2592 if (Record->getIdentifier()) { 2593 // C++ [class.mem]p13: 2594 // If T is the name of a class, then each of the following shall have a 2595 // name different from T: 2596 // - every member of every anonymous union that is a member of class T. 2597 // 2598 // C++ [class.mem]p14: 2599 // In addition, if class T has a user-declared constructor (12.1), every 2600 // non-static data member of class T shall have a name different from T. 2601 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2602 R.first != R.second; ++R.first) 2603 if (FieldDecl *Field = dyn_cast<FieldDecl>(*R.first)) { 2604 if (Record->hasUserDeclaredConstructor() || 2605 !Field->getDeclContext()->Equals(Record)) { 2606 Diag(Field->getLocation(), diag::err_member_name_of_class) 2607 << Field->getDeclName(); 2608 break; 2609 } 2610 } 2611 } 2612} 2613 2614void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2615 Decl *TagDecl, 2616 SourceLocation LBrac, 2617 SourceLocation RBrac, 2618 AttributeList *AttrList) { 2619 if (!TagDecl) 2620 return; 2621 2622 AdjustDeclIfTemplate(TagDecl); 2623 2624 ActOnFields(S, RLoc, TagDecl, 2625 // strict aliasing violation! 2626 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2627 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2628 2629 CheckCompletedCXXClass( 2630 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2631} 2632 2633namespace { 2634 /// \brief Helper class that collects exception specifications for 2635 /// implicitly-declared special member functions. 2636 class ImplicitExceptionSpecification { 2637 ASTContext &Context; 2638 bool AllowsAllExceptions; 2639 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2640 llvm::SmallVector<QualType, 4> Exceptions; 2641 2642 public: 2643 explicit ImplicitExceptionSpecification(ASTContext &Context) 2644 : Context(Context), AllowsAllExceptions(false) { } 2645 2646 /// \brief Whether the special member function should have any 2647 /// exception specification at all. 2648 bool hasExceptionSpecification() const { 2649 return !AllowsAllExceptions; 2650 } 2651 2652 /// \brief Whether the special member function should have a 2653 /// throw(...) exception specification (a Microsoft extension). 2654 bool hasAnyExceptionSpecification() const { 2655 return false; 2656 } 2657 2658 /// \brief The number of exceptions in the exception specification. 2659 unsigned size() const { return Exceptions.size(); } 2660 2661 /// \brief The set of exceptions in the exception specification. 2662 const QualType *data() const { return Exceptions.data(); } 2663 2664 /// \brief Note that 2665 void CalledDecl(CXXMethodDecl *Method) { 2666 // If we already know that we allow all exceptions, do nothing. 2667 if (AllowsAllExceptions || !Method) 2668 return; 2669 2670 const FunctionProtoType *Proto 2671 = Method->getType()->getAs<FunctionProtoType>(); 2672 2673 // If this function can throw any exceptions, make a note of that. 2674 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2675 AllowsAllExceptions = true; 2676 ExceptionsSeen.clear(); 2677 Exceptions.clear(); 2678 return; 2679 } 2680 2681 // Record the exceptions in this function's exception specification. 2682 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2683 EEnd = Proto->exception_end(); 2684 E != EEnd; ++E) 2685 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2686 Exceptions.push_back(*E); 2687 } 2688 }; 2689} 2690 2691 2692/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2693/// special functions, such as the default constructor, copy 2694/// constructor, or destructor, to the given C++ class (C++ 2695/// [special]p1). This routine can only be executed just before the 2696/// definition of the class is complete. 2697void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2698 if (!ClassDecl->hasUserDeclaredConstructor()) 2699 ++ASTContext::NumImplicitDefaultConstructors; 2700 2701 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2702 ++ASTContext::NumImplicitCopyConstructors; 2703 2704 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2705 ++ASTContext::NumImplicitCopyAssignmentOperators; 2706 2707 // If we have a dynamic class, then the copy assignment operator may be 2708 // virtual, so we have to declare it immediately. This ensures that, e.g., 2709 // it shows up in the right place in the vtable and that we diagnose 2710 // problems with the implicit exception specification. 2711 if (ClassDecl->isDynamicClass()) 2712 DeclareImplicitCopyAssignment(ClassDecl); 2713 } 2714 2715 if (!ClassDecl->hasUserDeclaredDestructor()) { 2716 ++ASTContext::NumImplicitDestructors; 2717 2718 // If we have a dynamic class, then the destructor may be virtual, so we 2719 // have to declare the destructor immediately. This ensures that, e.g., it 2720 // shows up in the right place in the vtable and that we diagnose problems 2721 // with the implicit exception specification. 2722 if (ClassDecl->isDynamicClass()) 2723 DeclareImplicitDestructor(ClassDecl); 2724 } 2725} 2726 2727void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2728 if (!D) 2729 return; 2730 2731 TemplateParameterList *Params = 0; 2732 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2733 Params = Template->getTemplateParameters(); 2734 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2735 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2736 Params = PartialSpec->getTemplateParameters(); 2737 else 2738 return; 2739 2740 for (TemplateParameterList::iterator Param = Params->begin(), 2741 ParamEnd = Params->end(); 2742 Param != ParamEnd; ++Param) { 2743 NamedDecl *Named = cast<NamedDecl>(*Param); 2744 if (Named->getDeclName()) { 2745 S->AddDecl(Named); 2746 IdResolver.AddDecl(Named); 2747 } 2748 } 2749} 2750 2751void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2752 if (!RecordD) return; 2753 AdjustDeclIfTemplate(RecordD); 2754 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2755 PushDeclContext(S, Record); 2756} 2757 2758void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2759 if (!RecordD) return; 2760 PopDeclContext(); 2761} 2762 2763/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2764/// parsing a top-level (non-nested) C++ class, and we are now 2765/// parsing those parts of the given Method declaration that could 2766/// not be parsed earlier (C++ [class.mem]p2), such as default 2767/// arguments. This action should enter the scope of the given 2768/// Method declaration as if we had just parsed the qualified method 2769/// name. However, it should not bring the parameters into scope; 2770/// that will be performed by ActOnDelayedCXXMethodParameter. 2771void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2772} 2773 2774/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2775/// C++ method declaration. We're (re-)introducing the given 2776/// function parameter into scope for use in parsing later parts of 2777/// the method declaration. For example, we could see an 2778/// ActOnParamDefaultArgument event for this parameter. 2779void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2780 if (!ParamD) 2781 return; 2782 2783 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2784 2785 // If this parameter has an unparsed default argument, clear it out 2786 // to make way for the parsed default argument. 2787 if (Param->hasUnparsedDefaultArg()) 2788 Param->setDefaultArg(0); 2789 2790 S->AddDecl(Param); 2791 if (Param->getDeclName()) 2792 IdResolver.AddDecl(Param); 2793} 2794 2795/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2796/// processing the delayed method declaration for Method. The method 2797/// declaration is now considered finished. There may be a separate 2798/// ActOnStartOfFunctionDef action later (not necessarily 2799/// immediately!) for this method, if it was also defined inside the 2800/// class body. 2801void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2802 if (!MethodD) 2803 return; 2804 2805 AdjustDeclIfTemplate(MethodD); 2806 2807 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2808 2809 // Now that we have our default arguments, check the constructor 2810 // again. It could produce additional diagnostics or affect whether 2811 // the class has implicitly-declared destructors, among other 2812 // things. 2813 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2814 CheckConstructor(Constructor); 2815 2816 // Check the default arguments, which we may have added. 2817 if (!Method->isInvalidDecl()) 2818 CheckCXXDefaultArguments(Method); 2819} 2820 2821/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2822/// the well-formedness of the constructor declarator @p D with type @p 2823/// R. If there are any errors in the declarator, this routine will 2824/// emit diagnostics and set the invalid bit to true. In any case, the type 2825/// will be updated to reflect a well-formed type for the constructor and 2826/// returned. 2827QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2828 StorageClass &SC) { 2829 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2830 2831 // C++ [class.ctor]p3: 2832 // A constructor shall not be virtual (10.3) or static (9.4). A 2833 // constructor can be invoked for a const, volatile or const 2834 // volatile object. A constructor shall not be declared const, 2835 // volatile, or const volatile (9.3.2). 2836 if (isVirtual) { 2837 if (!D.isInvalidType()) 2838 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2839 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2840 << SourceRange(D.getIdentifierLoc()); 2841 D.setInvalidType(); 2842 } 2843 if (SC == SC_Static) { 2844 if (!D.isInvalidType()) 2845 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2846 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2847 << SourceRange(D.getIdentifierLoc()); 2848 D.setInvalidType(); 2849 SC = SC_None; 2850 } 2851 2852 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2853 if (FTI.TypeQuals != 0) { 2854 if (FTI.TypeQuals & Qualifiers::Const) 2855 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2856 << "const" << SourceRange(D.getIdentifierLoc()); 2857 if (FTI.TypeQuals & Qualifiers::Volatile) 2858 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2859 << "volatile" << SourceRange(D.getIdentifierLoc()); 2860 if (FTI.TypeQuals & Qualifiers::Restrict) 2861 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2862 << "restrict" << SourceRange(D.getIdentifierLoc()); 2863 } 2864 2865 // Rebuild the function type "R" without any type qualifiers (in 2866 // case any of the errors above fired) and with "void" as the 2867 // return type, since constructors don't have return types. 2868 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2869 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2870 Proto->getNumArgs(), 2871 Proto->isVariadic(), 0, 2872 Proto->hasExceptionSpec(), 2873 Proto->hasAnyExceptionSpec(), 2874 Proto->getNumExceptions(), 2875 Proto->exception_begin(), 2876 Proto->getExtInfo()); 2877} 2878 2879/// CheckConstructor - Checks a fully-formed constructor for 2880/// well-formedness, issuing any diagnostics required. Returns true if 2881/// the constructor declarator is invalid. 2882void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2883 CXXRecordDecl *ClassDecl 2884 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2885 if (!ClassDecl) 2886 return Constructor->setInvalidDecl(); 2887 2888 // C++ [class.copy]p3: 2889 // A declaration of a constructor for a class X is ill-formed if 2890 // its first parameter is of type (optionally cv-qualified) X and 2891 // either there are no other parameters or else all other 2892 // parameters have default arguments. 2893 if (!Constructor->isInvalidDecl() && 2894 ((Constructor->getNumParams() == 1) || 2895 (Constructor->getNumParams() > 1 && 2896 Constructor->getParamDecl(1)->hasDefaultArg())) && 2897 Constructor->getTemplateSpecializationKind() 2898 != TSK_ImplicitInstantiation) { 2899 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2900 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2901 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2902 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2903 const char *ConstRef 2904 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2905 : " const &"; 2906 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2907 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2908 2909 // FIXME: Rather that making the constructor invalid, we should endeavor 2910 // to fix the type. 2911 Constructor->setInvalidDecl(); 2912 } 2913 } 2914} 2915 2916/// CheckDestructor - Checks a fully-formed destructor definition for 2917/// well-formedness, issuing any diagnostics required. Returns true 2918/// on error. 2919bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2920 CXXRecordDecl *RD = Destructor->getParent(); 2921 2922 if (Destructor->isVirtual()) { 2923 SourceLocation Loc; 2924 2925 if (!Destructor->isImplicit()) 2926 Loc = Destructor->getLocation(); 2927 else 2928 Loc = RD->getLocation(); 2929 2930 // If we have a virtual destructor, look up the deallocation function 2931 FunctionDecl *OperatorDelete = 0; 2932 DeclarationName Name = 2933 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2934 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2935 return true; 2936 2937 MarkDeclarationReferenced(Loc, OperatorDelete); 2938 2939 Destructor->setOperatorDelete(OperatorDelete); 2940 } 2941 2942 return false; 2943} 2944 2945static inline bool 2946FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2947 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2948 FTI.ArgInfo[0].Param && 2949 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 2950} 2951 2952/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2953/// the well-formednes of the destructor declarator @p D with type @p 2954/// R. If there are any errors in the declarator, this routine will 2955/// emit diagnostics and set the declarator to invalid. Even if this happens, 2956/// will be updated to reflect a well-formed type for the destructor and 2957/// returned. 2958QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2959 StorageClass& SC) { 2960 // C++ [class.dtor]p1: 2961 // [...] A typedef-name that names a class is a class-name 2962 // (7.1.3); however, a typedef-name that names a class shall not 2963 // be used as the identifier in the declarator for a destructor 2964 // declaration. 2965 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2966 if (isa<TypedefType>(DeclaratorType)) 2967 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2968 << DeclaratorType; 2969 2970 // C++ [class.dtor]p2: 2971 // A destructor is used to destroy objects of its class type. A 2972 // destructor takes no parameters, and no return type can be 2973 // specified for it (not even void). The address of a destructor 2974 // shall not be taken. A destructor shall not be static. A 2975 // destructor can be invoked for a const, volatile or const 2976 // volatile object. A destructor shall not be declared const, 2977 // volatile or const volatile (9.3.2). 2978 if (SC == SC_Static) { 2979 if (!D.isInvalidType()) 2980 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2981 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2982 << SourceRange(D.getIdentifierLoc()) 2983 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2984 2985 SC = SC_None; 2986 } 2987 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2988 // Destructors don't have return types, but the parser will 2989 // happily parse something like: 2990 // 2991 // class X { 2992 // float ~X(); 2993 // }; 2994 // 2995 // The return type will be eliminated later. 2996 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2997 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2998 << SourceRange(D.getIdentifierLoc()); 2999 } 3000 3001 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3002 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3003 if (FTI.TypeQuals & Qualifiers::Const) 3004 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3005 << "const" << SourceRange(D.getIdentifierLoc()); 3006 if (FTI.TypeQuals & Qualifiers::Volatile) 3007 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3008 << "volatile" << SourceRange(D.getIdentifierLoc()); 3009 if (FTI.TypeQuals & Qualifiers::Restrict) 3010 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3011 << "restrict" << SourceRange(D.getIdentifierLoc()); 3012 D.setInvalidType(); 3013 } 3014 3015 // Make sure we don't have any parameters. 3016 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3017 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3018 3019 // Delete the parameters. 3020 FTI.freeArgs(); 3021 D.setInvalidType(); 3022 } 3023 3024 // Make sure the destructor isn't variadic. 3025 if (FTI.isVariadic) { 3026 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3027 D.setInvalidType(); 3028 } 3029 3030 // Rebuild the function type "R" without any type qualifiers or 3031 // parameters (in case any of the errors above fired) and with 3032 // "void" as the return type, since destructors don't have return 3033 // types. 3034 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3035 if (!Proto) 3036 return QualType(); 3037 3038 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3039 Proto->hasExceptionSpec(), 3040 Proto->hasAnyExceptionSpec(), 3041 Proto->getNumExceptions(), 3042 Proto->exception_begin(), 3043 Proto->getExtInfo()); 3044} 3045 3046/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3047/// well-formednes of the conversion function declarator @p D with 3048/// type @p R. If there are any errors in the declarator, this routine 3049/// will emit diagnostics and return true. Otherwise, it will return 3050/// false. Either way, the type @p R will be updated to reflect a 3051/// well-formed type for the conversion operator. 3052void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3053 StorageClass& SC) { 3054 // C++ [class.conv.fct]p1: 3055 // Neither parameter types nor return type can be specified. The 3056 // type of a conversion function (8.3.5) is "function taking no 3057 // parameter returning conversion-type-id." 3058 if (SC == SC_Static) { 3059 if (!D.isInvalidType()) 3060 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3061 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3062 << SourceRange(D.getIdentifierLoc()); 3063 D.setInvalidType(); 3064 SC = SC_None; 3065 } 3066 3067 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3068 3069 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3070 // Conversion functions don't have return types, but the parser will 3071 // happily parse something like: 3072 // 3073 // class X { 3074 // float operator bool(); 3075 // }; 3076 // 3077 // The return type will be changed later anyway. 3078 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3079 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3080 << SourceRange(D.getIdentifierLoc()); 3081 D.setInvalidType(); 3082 } 3083 3084 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3085 3086 // Make sure we don't have any parameters. 3087 if (Proto->getNumArgs() > 0) { 3088 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3089 3090 // Delete the parameters. 3091 D.getTypeObject(0).Fun.freeArgs(); 3092 D.setInvalidType(); 3093 } else if (Proto->isVariadic()) { 3094 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3095 D.setInvalidType(); 3096 } 3097 3098 // Diagnose "&operator bool()" and other such nonsense. This 3099 // is actually a gcc extension which we don't support. 3100 if (Proto->getResultType() != ConvType) { 3101 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3102 << Proto->getResultType(); 3103 D.setInvalidType(); 3104 ConvType = Proto->getResultType(); 3105 } 3106 3107 // C++ [class.conv.fct]p4: 3108 // The conversion-type-id shall not represent a function type nor 3109 // an array type. 3110 if (ConvType->isArrayType()) { 3111 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3112 ConvType = Context.getPointerType(ConvType); 3113 D.setInvalidType(); 3114 } else if (ConvType->isFunctionType()) { 3115 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3116 ConvType = Context.getPointerType(ConvType); 3117 D.setInvalidType(); 3118 } 3119 3120 // Rebuild the function type "R" without any parameters (in case any 3121 // of the errors above fired) and with the conversion type as the 3122 // return type. 3123 if (D.isInvalidType()) { 3124 R = Context.getFunctionType(ConvType, 0, 0, false, 3125 Proto->getTypeQuals(), 3126 Proto->hasExceptionSpec(), 3127 Proto->hasAnyExceptionSpec(), 3128 Proto->getNumExceptions(), 3129 Proto->exception_begin(), 3130 Proto->getExtInfo()); 3131 } 3132 3133 // C++0x explicit conversion operators. 3134 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3135 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3136 diag::warn_explicit_conversion_functions) 3137 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3138} 3139 3140/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3141/// the declaration of the given C++ conversion function. This routine 3142/// is responsible for recording the conversion function in the C++ 3143/// class, if possible. 3144Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3145 assert(Conversion && "Expected to receive a conversion function declaration"); 3146 3147 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3148 3149 // Make sure we aren't redeclaring the conversion function. 3150 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3151 3152 // C++ [class.conv.fct]p1: 3153 // [...] A conversion function is never used to convert a 3154 // (possibly cv-qualified) object to the (possibly cv-qualified) 3155 // same object type (or a reference to it), to a (possibly 3156 // cv-qualified) base class of that type (or a reference to it), 3157 // or to (possibly cv-qualified) void. 3158 // FIXME: Suppress this warning if the conversion function ends up being a 3159 // virtual function that overrides a virtual function in a base class. 3160 QualType ClassType 3161 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3162 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3163 ConvType = ConvTypeRef->getPointeeType(); 3164 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3165 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3166 /* Suppress diagnostics for instantiations. */; 3167 else if (ConvType->isRecordType()) { 3168 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3169 if (ConvType == ClassType) 3170 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3171 << ClassType; 3172 else if (IsDerivedFrom(ClassType, ConvType)) 3173 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3174 << ClassType << ConvType; 3175 } else if (ConvType->isVoidType()) { 3176 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3177 << ClassType << ConvType; 3178 } 3179 3180 if (FunctionTemplateDecl *ConversionTemplate 3181 = Conversion->getDescribedFunctionTemplate()) 3182 return ConversionTemplate; 3183 3184 return Conversion; 3185} 3186 3187//===----------------------------------------------------------------------===// 3188// Namespace Handling 3189//===----------------------------------------------------------------------===// 3190 3191 3192 3193/// ActOnStartNamespaceDef - This is called at the start of a namespace 3194/// definition. 3195Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3196 SourceLocation InlineLoc, 3197 SourceLocation IdentLoc, 3198 IdentifierInfo *II, 3199 SourceLocation LBrace, 3200 AttributeList *AttrList) { 3201 // anonymous namespace starts at its left brace 3202 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3203 (II ? IdentLoc : LBrace) , II); 3204 Namespc->setLBracLoc(LBrace); 3205 Namespc->setInline(InlineLoc.isValid()); 3206 3207 Scope *DeclRegionScope = NamespcScope->getParent(); 3208 3209 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3210 3211 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3212 PushVisibilityAttr(attr); 3213 3214 if (II) { 3215 // C++ [namespace.def]p2: 3216 // The identifier in an original-namespace-definition shall not 3217 // have been previously defined in the declarative region in 3218 // which the original-namespace-definition appears. The 3219 // identifier in an original-namespace-definition is the name of 3220 // the namespace. Subsequently in that declarative region, it is 3221 // treated as an original-namespace-name. 3222 // 3223 // Since namespace names are unique in their scope, and we don't 3224 // look through using directives, just 3225 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3226 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3227 3228 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3229 // This is an extended namespace definition. 3230 if (Namespc->isInline() != OrigNS->isInline()) { 3231 // inline-ness must match 3232 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3233 << Namespc->isInline(); 3234 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3235 Namespc->setInvalidDecl(); 3236 // Recover by ignoring the new namespace's inline status. 3237 Namespc->setInline(OrigNS->isInline()); 3238 } 3239 3240 // Attach this namespace decl to the chain of extended namespace 3241 // definitions. 3242 OrigNS->setNextNamespace(Namespc); 3243 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3244 3245 // Remove the previous declaration from the scope. 3246 if (DeclRegionScope->isDeclScope(OrigNS)) { 3247 IdResolver.RemoveDecl(OrigNS); 3248 DeclRegionScope->RemoveDecl(OrigNS); 3249 } 3250 } else if (PrevDecl) { 3251 // This is an invalid name redefinition. 3252 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3253 << Namespc->getDeclName(); 3254 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3255 Namespc->setInvalidDecl(); 3256 // Continue on to push Namespc as current DeclContext and return it. 3257 } else if (II->isStr("std") && 3258 CurContext->getRedeclContext()->isTranslationUnit()) { 3259 // This is the first "real" definition of the namespace "std", so update 3260 // our cache of the "std" namespace to point at this definition. 3261 if (NamespaceDecl *StdNS = getStdNamespace()) { 3262 // We had already defined a dummy namespace "std". Link this new 3263 // namespace definition to the dummy namespace "std". 3264 StdNS->setNextNamespace(Namespc); 3265 StdNS->setLocation(IdentLoc); 3266 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3267 } 3268 3269 // Make our StdNamespace cache point at the first real definition of the 3270 // "std" namespace. 3271 StdNamespace = Namespc; 3272 } 3273 3274 PushOnScopeChains(Namespc, DeclRegionScope); 3275 } else { 3276 // Anonymous namespaces. 3277 assert(Namespc->isAnonymousNamespace()); 3278 3279 // Link the anonymous namespace into its parent. 3280 NamespaceDecl *PrevDecl; 3281 DeclContext *Parent = CurContext->getRedeclContext(); 3282 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3283 PrevDecl = TU->getAnonymousNamespace(); 3284 TU->setAnonymousNamespace(Namespc); 3285 } else { 3286 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3287 PrevDecl = ND->getAnonymousNamespace(); 3288 ND->setAnonymousNamespace(Namespc); 3289 } 3290 3291 // Link the anonymous namespace with its previous declaration. 3292 if (PrevDecl) { 3293 assert(PrevDecl->isAnonymousNamespace()); 3294 assert(!PrevDecl->getNextNamespace()); 3295 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3296 PrevDecl->setNextNamespace(Namespc); 3297 3298 if (Namespc->isInline() != PrevDecl->isInline()) { 3299 // inline-ness must match 3300 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3301 << Namespc->isInline(); 3302 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3303 Namespc->setInvalidDecl(); 3304 // Recover by ignoring the new namespace's inline status. 3305 Namespc->setInline(PrevDecl->isInline()); 3306 } 3307 } 3308 3309 CurContext->addDecl(Namespc); 3310 3311 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3312 // behaves as if it were replaced by 3313 // namespace unique { /* empty body */ } 3314 // using namespace unique; 3315 // namespace unique { namespace-body } 3316 // where all occurrences of 'unique' in a translation unit are 3317 // replaced by the same identifier and this identifier differs 3318 // from all other identifiers in the entire program. 3319 3320 // We just create the namespace with an empty name and then add an 3321 // implicit using declaration, just like the standard suggests. 3322 // 3323 // CodeGen enforces the "universally unique" aspect by giving all 3324 // declarations semantically contained within an anonymous 3325 // namespace internal linkage. 3326 3327 if (!PrevDecl) { 3328 UsingDirectiveDecl* UD 3329 = UsingDirectiveDecl::Create(Context, CurContext, 3330 /* 'using' */ LBrace, 3331 /* 'namespace' */ SourceLocation(), 3332 /* qualifier */ SourceRange(), 3333 /* NNS */ NULL, 3334 /* identifier */ SourceLocation(), 3335 Namespc, 3336 /* Ancestor */ CurContext); 3337 UD->setImplicit(); 3338 CurContext->addDecl(UD); 3339 } 3340 } 3341 3342 // Although we could have an invalid decl (i.e. the namespace name is a 3343 // redefinition), push it as current DeclContext and try to continue parsing. 3344 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3345 // for the namespace has the declarations that showed up in that particular 3346 // namespace definition. 3347 PushDeclContext(NamespcScope, Namespc); 3348 return Namespc; 3349} 3350 3351/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3352/// is a namespace alias, returns the namespace it points to. 3353static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3354 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3355 return AD->getNamespace(); 3356 return dyn_cast_or_null<NamespaceDecl>(D); 3357} 3358 3359/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3360/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3361void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3362 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3363 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3364 Namespc->setRBracLoc(RBrace); 3365 PopDeclContext(); 3366 if (Namespc->hasAttr<VisibilityAttr>()) 3367 PopPragmaVisibility(); 3368} 3369 3370CXXRecordDecl *Sema::getStdBadAlloc() const { 3371 return cast_or_null<CXXRecordDecl>( 3372 StdBadAlloc.get(Context.getExternalSource())); 3373} 3374 3375NamespaceDecl *Sema::getStdNamespace() const { 3376 return cast_or_null<NamespaceDecl>( 3377 StdNamespace.get(Context.getExternalSource())); 3378} 3379 3380/// \brief Retrieve the special "std" namespace, which may require us to 3381/// implicitly define the namespace. 3382NamespaceDecl *Sema::getOrCreateStdNamespace() { 3383 if (!StdNamespace) { 3384 // The "std" namespace has not yet been defined, so build one implicitly. 3385 StdNamespace = NamespaceDecl::Create(Context, 3386 Context.getTranslationUnitDecl(), 3387 SourceLocation(), 3388 &PP.getIdentifierTable().get("std")); 3389 getStdNamespace()->setImplicit(true); 3390 } 3391 3392 return getStdNamespace(); 3393} 3394 3395Decl *Sema::ActOnUsingDirective(Scope *S, 3396 SourceLocation UsingLoc, 3397 SourceLocation NamespcLoc, 3398 CXXScopeSpec &SS, 3399 SourceLocation IdentLoc, 3400 IdentifierInfo *NamespcName, 3401 AttributeList *AttrList) { 3402 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3403 assert(NamespcName && "Invalid NamespcName."); 3404 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3405 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3406 3407 UsingDirectiveDecl *UDir = 0; 3408 NestedNameSpecifier *Qualifier = 0; 3409 if (SS.isSet()) 3410 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3411 3412 // Lookup namespace name. 3413 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3414 LookupParsedName(R, S, &SS); 3415 if (R.isAmbiguous()) 3416 return 0; 3417 3418 if (R.empty()) { 3419 // Allow "using namespace std;" or "using namespace ::std;" even if 3420 // "std" hasn't been defined yet, for GCC compatibility. 3421 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3422 NamespcName->isStr("std")) { 3423 Diag(IdentLoc, diag::ext_using_undefined_std); 3424 R.addDecl(getOrCreateStdNamespace()); 3425 R.resolveKind(); 3426 } 3427 // Otherwise, attempt typo correction. 3428 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3429 CTC_NoKeywords, 0)) { 3430 if (R.getAsSingle<NamespaceDecl>() || 3431 R.getAsSingle<NamespaceAliasDecl>()) { 3432 if (DeclContext *DC = computeDeclContext(SS, false)) 3433 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3434 << NamespcName << DC << Corrected << SS.getRange() 3435 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3436 else 3437 Diag(IdentLoc, diag::err_using_directive_suggest) 3438 << NamespcName << Corrected 3439 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3440 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3441 << Corrected; 3442 3443 NamespcName = Corrected.getAsIdentifierInfo(); 3444 } else { 3445 R.clear(); 3446 R.setLookupName(NamespcName); 3447 } 3448 } 3449 } 3450 3451 if (!R.empty()) { 3452 NamedDecl *Named = R.getFoundDecl(); 3453 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3454 && "expected namespace decl"); 3455 // C++ [namespace.udir]p1: 3456 // A using-directive specifies that the names in the nominated 3457 // namespace can be used in the scope in which the 3458 // using-directive appears after the using-directive. During 3459 // unqualified name lookup (3.4.1), the names appear as if they 3460 // were declared in the nearest enclosing namespace which 3461 // contains both the using-directive and the nominated 3462 // namespace. [Note: in this context, "contains" means "contains 3463 // directly or indirectly". ] 3464 3465 // Find enclosing context containing both using-directive and 3466 // nominated namespace. 3467 NamespaceDecl *NS = getNamespaceDecl(Named); 3468 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3469 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3470 CommonAncestor = CommonAncestor->getParent(); 3471 3472 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3473 SS.getRange(), 3474 (NestedNameSpecifier *)SS.getScopeRep(), 3475 IdentLoc, Named, CommonAncestor); 3476 PushUsingDirective(S, UDir); 3477 } else { 3478 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3479 } 3480 3481 // FIXME: We ignore attributes for now. 3482 delete AttrList; 3483 return UDir; 3484} 3485 3486void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3487 // If scope has associated entity, then using directive is at namespace 3488 // or translation unit scope. We add UsingDirectiveDecls, into 3489 // it's lookup structure. 3490 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3491 Ctx->addDecl(UDir); 3492 else 3493 // Otherwise it is block-sope. using-directives will affect lookup 3494 // only to the end of scope. 3495 S->PushUsingDirective(UDir); 3496} 3497 3498 3499Decl *Sema::ActOnUsingDeclaration(Scope *S, 3500 AccessSpecifier AS, 3501 bool HasUsingKeyword, 3502 SourceLocation UsingLoc, 3503 CXXScopeSpec &SS, 3504 UnqualifiedId &Name, 3505 AttributeList *AttrList, 3506 bool IsTypeName, 3507 SourceLocation TypenameLoc) { 3508 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3509 3510 switch (Name.getKind()) { 3511 case UnqualifiedId::IK_Identifier: 3512 case UnqualifiedId::IK_OperatorFunctionId: 3513 case UnqualifiedId::IK_LiteralOperatorId: 3514 case UnqualifiedId::IK_ConversionFunctionId: 3515 break; 3516 3517 case UnqualifiedId::IK_ConstructorName: 3518 case UnqualifiedId::IK_ConstructorTemplateId: 3519 // C++0x inherited constructors. 3520 if (getLangOptions().CPlusPlus0x) break; 3521 3522 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3523 << SS.getRange(); 3524 return 0; 3525 3526 case UnqualifiedId::IK_DestructorName: 3527 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3528 << SS.getRange(); 3529 return 0; 3530 3531 case UnqualifiedId::IK_TemplateId: 3532 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3533 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3534 return 0; 3535 } 3536 3537 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3538 DeclarationName TargetName = TargetNameInfo.getName(); 3539 if (!TargetName) 3540 return 0; 3541 3542 // Warn about using declarations. 3543 // TODO: store that the declaration was written without 'using' and 3544 // talk about access decls instead of using decls in the 3545 // diagnostics. 3546 if (!HasUsingKeyword) { 3547 UsingLoc = Name.getSourceRange().getBegin(); 3548 3549 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3550 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3551 } 3552 3553 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3554 TargetNameInfo, AttrList, 3555 /* IsInstantiation */ false, 3556 IsTypeName, TypenameLoc); 3557 if (UD) 3558 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3559 3560 return UD; 3561} 3562 3563/// \brief Determine whether a using declaration considers the given 3564/// declarations as "equivalent", e.g., if they are redeclarations of 3565/// the same entity or are both typedefs of the same type. 3566static bool 3567IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3568 bool &SuppressRedeclaration) { 3569 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3570 SuppressRedeclaration = false; 3571 return true; 3572 } 3573 3574 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3575 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3576 SuppressRedeclaration = true; 3577 return Context.hasSameType(TD1->getUnderlyingType(), 3578 TD2->getUnderlyingType()); 3579 } 3580 3581 return false; 3582} 3583 3584 3585/// Determines whether to create a using shadow decl for a particular 3586/// decl, given the set of decls existing prior to this using lookup. 3587bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3588 const LookupResult &Previous) { 3589 // Diagnose finding a decl which is not from a base class of the 3590 // current class. We do this now because there are cases where this 3591 // function will silently decide not to build a shadow decl, which 3592 // will pre-empt further diagnostics. 3593 // 3594 // We don't need to do this in C++0x because we do the check once on 3595 // the qualifier. 3596 // 3597 // FIXME: diagnose the following if we care enough: 3598 // struct A { int foo; }; 3599 // struct B : A { using A::foo; }; 3600 // template <class T> struct C : A {}; 3601 // template <class T> struct D : C<T> { using B::foo; } // <--- 3602 // This is invalid (during instantiation) in C++03 because B::foo 3603 // resolves to the using decl in B, which is not a base class of D<T>. 3604 // We can't diagnose it immediately because C<T> is an unknown 3605 // specialization. The UsingShadowDecl in D<T> then points directly 3606 // to A::foo, which will look well-formed when we instantiate. 3607 // The right solution is to not collapse the shadow-decl chain. 3608 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3609 DeclContext *OrigDC = Orig->getDeclContext(); 3610 3611 // Handle enums and anonymous structs. 3612 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3613 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3614 while (OrigRec->isAnonymousStructOrUnion()) 3615 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3616 3617 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3618 if (OrigDC == CurContext) { 3619 Diag(Using->getLocation(), 3620 diag::err_using_decl_nested_name_specifier_is_current_class) 3621 << Using->getNestedNameRange(); 3622 Diag(Orig->getLocation(), diag::note_using_decl_target); 3623 return true; 3624 } 3625 3626 Diag(Using->getNestedNameRange().getBegin(), 3627 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3628 << Using->getTargetNestedNameDecl() 3629 << cast<CXXRecordDecl>(CurContext) 3630 << Using->getNestedNameRange(); 3631 Diag(Orig->getLocation(), diag::note_using_decl_target); 3632 return true; 3633 } 3634 } 3635 3636 if (Previous.empty()) return false; 3637 3638 NamedDecl *Target = Orig; 3639 if (isa<UsingShadowDecl>(Target)) 3640 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3641 3642 // If the target happens to be one of the previous declarations, we 3643 // don't have a conflict. 3644 // 3645 // FIXME: but we might be increasing its access, in which case we 3646 // should redeclare it. 3647 NamedDecl *NonTag = 0, *Tag = 0; 3648 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3649 I != E; ++I) { 3650 NamedDecl *D = (*I)->getUnderlyingDecl(); 3651 bool Result; 3652 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3653 return Result; 3654 3655 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3656 } 3657 3658 if (Target->isFunctionOrFunctionTemplate()) { 3659 FunctionDecl *FD; 3660 if (isa<FunctionTemplateDecl>(Target)) 3661 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3662 else 3663 FD = cast<FunctionDecl>(Target); 3664 3665 NamedDecl *OldDecl = 0; 3666 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3667 case Ovl_Overload: 3668 return false; 3669 3670 case Ovl_NonFunction: 3671 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3672 break; 3673 3674 // We found a decl with the exact signature. 3675 case Ovl_Match: 3676 // If we're in a record, we want to hide the target, so we 3677 // return true (without a diagnostic) to tell the caller not to 3678 // build a shadow decl. 3679 if (CurContext->isRecord()) 3680 return true; 3681 3682 // If we're not in a record, this is an error. 3683 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3684 break; 3685 } 3686 3687 Diag(Target->getLocation(), diag::note_using_decl_target); 3688 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3689 return true; 3690 } 3691 3692 // Target is not a function. 3693 3694 if (isa<TagDecl>(Target)) { 3695 // No conflict between a tag and a non-tag. 3696 if (!Tag) return false; 3697 3698 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3699 Diag(Target->getLocation(), diag::note_using_decl_target); 3700 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3701 return true; 3702 } 3703 3704 // No conflict between a tag and a non-tag. 3705 if (!NonTag) return false; 3706 3707 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3708 Diag(Target->getLocation(), diag::note_using_decl_target); 3709 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3710 return true; 3711} 3712 3713/// Builds a shadow declaration corresponding to a 'using' declaration. 3714UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3715 UsingDecl *UD, 3716 NamedDecl *Orig) { 3717 3718 // If we resolved to another shadow declaration, just coalesce them. 3719 NamedDecl *Target = Orig; 3720 if (isa<UsingShadowDecl>(Target)) { 3721 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3722 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3723 } 3724 3725 UsingShadowDecl *Shadow 3726 = UsingShadowDecl::Create(Context, CurContext, 3727 UD->getLocation(), UD, Target); 3728 UD->addShadowDecl(Shadow); 3729 3730 Shadow->setAccess(UD->getAccess()); 3731 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3732 Shadow->setInvalidDecl(); 3733 3734 if (S) 3735 PushOnScopeChains(Shadow, S); 3736 else 3737 CurContext->addDecl(Shadow); 3738 3739 3740 return Shadow; 3741} 3742 3743/// Hides a using shadow declaration. This is required by the current 3744/// using-decl implementation when a resolvable using declaration in a 3745/// class is followed by a declaration which would hide or override 3746/// one or more of the using decl's targets; for example: 3747/// 3748/// struct Base { void foo(int); }; 3749/// struct Derived : Base { 3750/// using Base::foo; 3751/// void foo(int); 3752/// }; 3753/// 3754/// The governing language is C++03 [namespace.udecl]p12: 3755/// 3756/// When a using-declaration brings names from a base class into a 3757/// derived class scope, member functions in the derived class 3758/// override and/or hide member functions with the same name and 3759/// parameter types in a base class (rather than conflicting). 3760/// 3761/// There are two ways to implement this: 3762/// (1) optimistically create shadow decls when they're not hidden 3763/// by existing declarations, or 3764/// (2) don't create any shadow decls (or at least don't make them 3765/// visible) until we've fully parsed/instantiated the class. 3766/// The problem with (1) is that we might have to retroactively remove 3767/// a shadow decl, which requires several O(n) operations because the 3768/// decl structures are (very reasonably) not designed for removal. 3769/// (2) avoids this but is very fiddly and phase-dependent. 3770void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3771 if (Shadow->getDeclName().getNameKind() == 3772 DeclarationName::CXXConversionFunctionName) 3773 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3774 3775 // Remove it from the DeclContext... 3776 Shadow->getDeclContext()->removeDecl(Shadow); 3777 3778 // ...and the scope, if applicable... 3779 if (S) { 3780 S->RemoveDecl(Shadow); 3781 IdResolver.RemoveDecl(Shadow); 3782 } 3783 3784 // ...and the using decl. 3785 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3786 3787 // TODO: complain somehow if Shadow was used. It shouldn't 3788 // be possible for this to happen, because...? 3789} 3790 3791/// Builds a using declaration. 3792/// 3793/// \param IsInstantiation - Whether this call arises from an 3794/// instantiation of an unresolved using declaration. We treat 3795/// the lookup differently for these declarations. 3796NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3797 SourceLocation UsingLoc, 3798 CXXScopeSpec &SS, 3799 const DeclarationNameInfo &NameInfo, 3800 AttributeList *AttrList, 3801 bool IsInstantiation, 3802 bool IsTypeName, 3803 SourceLocation TypenameLoc) { 3804 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3805 SourceLocation IdentLoc = NameInfo.getLoc(); 3806 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3807 3808 // FIXME: We ignore attributes for now. 3809 delete AttrList; 3810 3811 if (SS.isEmpty()) { 3812 Diag(IdentLoc, diag::err_using_requires_qualname); 3813 return 0; 3814 } 3815 3816 // Do the redeclaration lookup in the current scope. 3817 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3818 ForRedeclaration); 3819 Previous.setHideTags(false); 3820 if (S) { 3821 LookupName(Previous, S); 3822 3823 // It is really dumb that we have to do this. 3824 LookupResult::Filter F = Previous.makeFilter(); 3825 while (F.hasNext()) { 3826 NamedDecl *D = F.next(); 3827 if (!isDeclInScope(D, CurContext, S)) 3828 F.erase(); 3829 } 3830 F.done(); 3831 } else { 3832 assert(IsInstantiation && "no scope in non-instantiation"); 3833 assert(CurContext->isRecord() && "scope not record in instantiation"); 3834 LookupQualifiedName(Previous, CurContext); 3835 } 3836 3837 NestedNameSpecifier *NNS = 3838 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3839 3840 // Check for invalid redeclarations. 3841 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3842 return 0; 3843 3844 // Check for bad qualifiers. 3845 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3846 return 0; 3847 3848 DeclContext *LookupContext = computeDeclContext(SS); 3849 NamedDecl *D; 3850 if (!LookupContext) { 3851 if (IsTypeName) { 3852 // FIXME: not all declaration name kinds are legal here 3853 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3854 UsingLoc, TypenameLoc, 3855 SS.getRange(), NNS, 3856 IdentLoc, NameInfo.getName()); 3857 } else { 3858 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3859 UsingLoc, SS.getRange(), 3860 NNS, NameInfo); 3861 } 3862 } else { 3863 D = UsingDecl::Create(Context, CurContext, 3864 SS.getRange(), UsingLoc, NNS, NameInfo, 3865 IsTypeName); 3866 } 3867 D->setAccess(AS); 3868 CurContext->addDecl(D); 3869 3870 if (!LookupContext) return D; 3871 UsingDecl *UD = cast<UsingDecl>(D); 3872 3873 if (RequireCompleteDeclContext(SS, LookupContext)) { 3874 UD->setInvalidDecl(); 3875 return UD; 3876 } 3877 3878 // Look up the target name. 3879 3880 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3881 3882 // Unlike most lookups, we don't always want to hide tag 3883 // declarations: tag names are visible through the using declaration 3884 // even if hidden by ordinary names, *except* in a dependent context 3885 // where it's important for the sanity of two-phase lookup. 3886 if (!IsInstantiation) 3887 R.setHideTags(false); 3888 3889 LookupQualifiedName(R, LookupContext); 3890 3891 if (R.empty()) { 3892 Diag(IdentLoc, diag::err_no_member) 3893 << NameInfo.getName() << LookupContext << SS.getRange(); 3894 UD->setInvalidDecl(); 3895 return UD; 3896 } 3897 3898 if (R.isAmbiguous()) { 3899 UD->setInvalidDecl(); 3900 return UD; 3901 } 3902 3903 if (IsTypeName) { 3904 // If we asked for a typename and got a non-type decl, error out. 3905 if (!R.getAsSingle<TypeDecl>()) { 3906 Diag(IdentLoc, diag::err_using_typename_non_type); 3907 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3908 Diag((*I)->getUnderlyingDecl()->getLocation(), 3909 diag::note_using_decl_target); 3910 UD->setInvalidDecl(); 3911 return UD; 3912 } 3913 } else { 3914 // If we asked for a non-typename and we got a type, error out, 3915 // but only if this is an instantiation of an unresolved using 3916 // decl. Otherwise just silently find the type name. 3917 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3918 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3919 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3920 UD->setInvalidDecl(); 3921 return UD; 3922 } 3923 } 3924 3925 // C++0x N2914 [namespace.udecl]p6: 3926 // A using-declaration shall not name a namespace. 3927 if (R.getAsSingle<NamespaceDecl>()) { 3928 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3929 << SS.getRange(); 3930 UD->setInvalidDecl(); 3931 return UD; 3932 } 3933 3934 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3935 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3936 BuildUsingShadowDecl(S, UD, *I); 3937 } 3938 3939 return UD; 3940} 3941 3942/// Checks that the given using declaration is not an invalid 3943/// redeclaration. Note that this is checking only for the using decl 3944/// itself, not for any ill-formedness among the UsingShadowDecls. 3945bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3946 bool isTypeName, 3947 const CXXScopeSpec &SS, 3948 SourceLocation NameLoc, 3949 const LookupResult &Prev) { 3950 // C++03 [namespace.udecl]p8: 3951 // C++0x [namespace.udecl]p10: 3952 // A using-declaration is a declaration and can therefore be used 3953 // repeatedly where (and only where) multiple declarations are 3954 // allowed. 3955 // 3956 // That's in non-member contexts. 3957 if (!CurContext->getRedeclContext()->isRecord()) 3958 return false; 3959 3960 NestedNameSpecifier *Qual 3961 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3962 3963 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3964 NamedDecl *D = *I; 3965 3966 bool DTypename; 3967 NestedNameSpecifier *DQual; 3968 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3969 DTypename = UD->isTypeName(); 3970 DQual = UD->getTargetNestedNameDecl(); 3971 } else if (UnresolvedUsingValueDecl *UD 3972 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3973 DTypename = false; 3974 DQual = UD->getTargetNestedNameSpecifier(); 3975 } else if (UnresolvedUsingTypenameDecl *UD 3976 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3977 DTypename = true; 3978 DQual = UD->getTargetNestedNameSpecifier(); 3979 } else continue; 3980 3981 // using decls differ if one says 'typename' and the other doesn't. 3982 // FIXME: non-dependent using decls? 3983 if (isTypeName != DTypename) continue; 3984 3985 // using decls differ if they name different scopes (but note that 3986 // template instantiation can cause this check to trigger when it 3987 // didn't before instantiation). 3988 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3989 Context.getCanonicalNestedNameSpecifier(DQual)) 3990 continue; 3991 3992 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3993 Diag(D->getLocation(), diag::note_using_decl) << 1; 3994 return true; 3995 } 3996 3997 return false; 3998} 3999 4000 4001/// Checks that the given nested-name qualifier used in a using decl 4002/// in the current context is appropriately related to the current 4003/// scope. If an error is found, diagnoses it and returns true. 4004bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4005 const CXXScopeSpec &SS, 4006 SourceLocation NameLoc) { 4007 DeclContext *NamedContext = computeDeclContext(SS); 4008 4009 if (!CurContext->isRecord()) { 4010 // C++03 [namespace.udecl]p3: 4011 // C++0x [namespace.udecl]p8: 4012 // A using-declaration for a class member shall be a member-declaration. 4013 4014 // If we weren't able to compute a valid scope, it must be a 4015 // dependent class scope. 4016 if (!NamedContext || NamedContext->isRecord()) { 4017 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4018 << SS.getRange(); 4019 return true; 4020 } 4021 4022 // Otherwise, everything is known to be fine. 4023 return false; 4024 } 4025 4026 // The current scope is a record. 4027 4028 // If the named context is dependent, we can't decide much. 4029 if (!NamedContext) { 4030 // FIXME: in C++0x, we can diagnose if we can prove that the 4031 // nested-name-specifier does not refer to a base class, which is 4032 // still possible in some cases. 4033 4034 // Otherwise we have to conservatively report that things might be 4035 // okay. 4036 return false; 4037 } 4038 4039 if (!NamedContext->isRecord()) { 4040 // Ideally this would point at the last name in the specifier, 4041 // but we don't have that level of source info. 4042 Diag(SS.getRange().getBegin(), 4043 diag::err_using_decl_nested_name_specifier_is_not_class) 4044 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4045 return true; 4046 } 4047 4048 if (getLangOptions().CPlusPlus0x) { 4049 // C++0x [namespace.udecl]p3: 4050 // In a using-declaration used as a member-declaration, the 4051 // nested-name-specifier shall name a base class of the class 4052 // being defined. 4053 4054 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4055 cast<CXXRecordDecl>(NamedContext))) { 4056 if (CurContext == NamedContext) { 4057 Diag(NameLoc, 4058 diag::err_using_decl_nested_name_specifier_is_current_class) 4059 << SS.getRange(); 4060 return true; 4061 } 4062 4063 Diag(SS.getRange().getBegin(), 4064 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4065 << (NestedNameSpecifier*) SS.getScopeRep() 4066 << cast<CXXRecordDecl>(CurContext) 4067 << SS.getRange(); 4068 return true; 4069 } 4070 4071 return false; 4072 } 4073 4074 // C++03 [namespace.udecl]p4: 4075 // A using-declaration used as a member-declaration shall refer 4076 // to a member of a base class of the class being defined [etc.]. 4077 4078 // Salient point: SS doesn't have to name a base class as long as 4079 // lookup only finds members from base classes. Therefore we can 4080 // diagnose here only if we can prove that that can't happen, 4081 // i.e. if the class hierarchies provably don't intersect. 4082 4083 // TODO: it would be nice if "definitely valid" results were cached 4084 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4085 // need to be repeated. 4086 4087 struct UserData { 4088 llvm::DenseSet<const CXXRecordDecl*> Bases; 4089 4090 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4091 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4092 Data->Bases.insert(Base); 4093 return true; 4094 } 4095 4096 bool hasDependentBases(const CXXRecordDecl *Class) { 4097 return !Class->forallBases(collect, this); 4098 } 4099 4100 /// Returns true if the base is dependent or is one of the 4101 /// accumulated base classes. 4102 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4103 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4104 return !Data->Bases.count(Base); 4105 } 4106 4107 bool mightShareBases(const CXXRecordDecl *Class) { 4108 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4109 } 4110 }; 4111 4112 UserData Data; 4113 4114 // Returns false if we find a dependent base. 4115 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4116 return false; 4117 4118 // Returns false if the class has a dependent base or if it or one 4119 // of its bases is present in the base set of the current context. 4120 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4121 return false; 4122 4123 Diag(SS.getRange().getBegin(), 4124 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4125 << (NestedNameSpecifier*) SS.getScopeRep() 4126 << cast<CXXRecordDecl>(CurContext) 4127 << SS.getRange(); 4128 4129 return true; 4130} 4131 4132Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4133 SourceLocation NamespaceLoc, 4134 SourceLocation AliasLoc, 4135 IdentifierInfo *Alias, 4136 CXXScopeSpec &SS, 4137 SourceLocation IdentLoc, 4138 IdentifierInfo *Ident) { 4139 4140 // Lookup the namespace name. 4141 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4142 LookupParsedName(R, S, &SS); 4143 4144 // Check if we have a previous declaration with the same name. 4145 NamedDecl *PrevDecl 4146 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4147 ForRedeclaration); 4148 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4149 PrevDecl = 0; 4150 4151 if (PrevDecl) { 4152 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4153 // We already have an alias with the same name that points to the same 4154 // namespace, so don't create a new one. 4155 // FIXME: At some point, we'll want to create the (redundant) 4156 // declaration to maintain better source information. 4157 if (!R.isAmbiguous() && !R.empty() && 4158 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4159 return 0; 4160 } 4161 4162 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4163 diag::err_redefinition_different_kind; 4164 Diag(AliasLoc, DiagID) << Alias; 4165 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4166 return 0; 4167 } 4168 4169 if (R.isAmbiguous()) 4170 return 0; 4171 4172 if (R.empty()) { 4173 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4174 CTC_NoKeywords, 0)) { 4175 if (R.getAsSingle<NamespaceDecl>() || 4176 R.getAsSingle<NamespaceAliasDecl>()) { 4177 if (DeclContext *DC = computeDeclContext(SS, false)) 4178 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4179 << Ident << DC << Corrected << SS.getRange() 4180 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4181 else 4182 Diag(IdentLoc, diag::err_using_directive_suggest) 4183 << Ident << Corrected 4184 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4185 4186 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4187 << Corrected; 4188 4189 Ident = Corrected.getAsIdentifierInfo(); 4190 } else { 4191 R.clear(); 4192 R.setLookupName(Ident); 4193 } 4194 } 4195 4196 if (R.empty()) { 4197 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4198 return 0; 4199 } 4200 } 4201 4202 NamespaceAliasDecl *AliasDecl = 4203 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4204 Alias, SS.getRange(), 4205 (NestedNameSpecifier *)SS.getScopeRep(), 4206 IdentLoc, R.getFoundDecl()); 4207 4208 PushOnScopeChains(AliasDecl, S); 4209 return AliasDecl; 4210} 4211 4212namespace { 4213 /// \brief Scoped object used to handle the state changes required in Sema 4214 /// to implicitly define the body of a C++ member function; 4215 class ImplicitlyDefinedFunctionScope { 4216 Sema &S; 4217 DeclContext *PreviousContext; 4218 4219 public: 4220 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4221 : S(S), PreviousContext(S.CurContext) 4222 { 4223 S.CurContext = Method; 4224 S.PushFunctionScope(); 4225 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4226 } 4227 4228 ~ImplicitlyDefinedFunctionScope() { 4229 S.PopExpressionEvaluationContext(); 4230 S.PopFunctionOrBlockScope(); 4231 S.CurContext = PreviousContext; 4232 } 4233 }; 4234} 4235 4236static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4237 CXXRecordDecl *D) { 4238 ASTContext &Context = Self.Context; 4239 QualType ClassType = Context.getTypeDeclType(D); 4240 DeclarationName ConstructorName 4241 = Context.DeclarationNames.getCXXConstructorName( 4242 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4243 4244 DeclContext::lookup_const_iterator Con, ConEnd; 4245 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4246 Con != ConEnd; ++Con) { 4247 // FIXME: In C++0x, a constructor template can be a default constructor. 4248 if (isa<FunctionTemplateDecl>(*Con)) 4249 continue; 4250 4251 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4252 if (Constructor->isDefaultConstructor()) 4253 return Constructor; 4254 } 4255 return 0; 4256} 4257 4258CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4259 CXXRecordDecl *ClassDecl) { 4260 // C++ [class.ctor]p5: 4261 // A default constructor for a class X is a constructor of class X 4262 // that can be called without an argument. If there is no 4263 // user-declared constructor for class X, a default constructor is 4264 // implicitly declared. An implicitly-declared default constructor 4265 // is an inline public member of its class. 4266 assert(!ClassDecl->hasUserDeclaredConstructor() && 4267 "Should not build implicit default constructor!"); 4268 4269 // C++ [except.spec]p14: 4270 // An implicitly declared special member function (Clause 12) shall have an 4271 // exception-specification. [...] 4272 ImplicitExceptionSpecification ExceptSpec(Context); 4273 4274 // Direct base-class destructors. 4275 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4276 BEnd = ClassDecl->bases_end(); 4277 B != BEnd; ++B) { 4278 if (B->isVirtual()) // Handled below. 4279 continue; 4280 4281 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4282 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4283 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4284 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4285 else if (CXXConstructorDecl *Constructor 4286 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4287 ExceptSpec.CalledDecl(Constructor); 4288 } 4289 } 4290 4291 // Virtual base-class destructors. 4292 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4293 BEnd = ClassDecl->vbases_end(); 4294 B != BEnd; ++B) { 4295 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4296 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4297 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4298 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4299 else if (CXXConstructorDecl *Constructor 4300 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4301 ExceptSpec.CalledDecl(Constructor); 4302 } 4303 } 4304 4305 // Field destructors. 4306 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4307 FEnd = ClassDecl->field_end(); 4308 F != FEnd; ++F) { 4309 if (const RecordType *RecordTy 4310 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4311 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4312 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4313 ExceptSpec.CalledDecl( 4314 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4315 else if (CXXConstructorDecl *Constructor 4316 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4317 ExceptSpec.CalledDecl(Constructor); 4318 } 4319 } 4320 4321 4322 // Create the actual constructor declaration. 4323 CanQualType ClassType 4324 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4325 DeclarationName Name 4326 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4327 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4328 CXXConstructorDecl *DefaultCon 4329 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4330 Context.getFunctionType(Context.VoidTy, 4331 0, 0, false, 0, 4332 ExceptSpec.hasExceptionSpecification(), 4333 ExceptSpec.hasAnyExceptionSpecification(), 4334 ExceptSpec.size(), 4335 ExceptSpec.data(), 4336 FunctionType::ExtInfo()), 4337 /*TInfo=*/0, 4338 /*isExplicit=*/false, 4339 /*isInline=*/true, 4340 /*isImplicitlyDeclared=*/true); 4341 DefaultCon->setAccess(AS_public); 4342 DefaultCon->setImplicit(); 4343 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4344 4345 // Note that we have declared this constructor. 4346 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4347 4348 if (Scope *S = getScopeForContext(ClassDecl)) 4349 PushOnScopeChains(DefaultCon, S, false); 4350 ClassDecl->addDecl(DefaultCon); 4351 4352 return DefaultCon; 4353} 4354 4355void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4356 CXXConstructorDecl *Constructor) { 4357 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4358 !Constructor->isUsed(false)) && 4359 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4360 4361 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4362 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4363 4364 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4365 ErrorTrap Trap(*this); 4366 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4367 Trap.hasErrorOccurred()) { 4368 Diag(CurrentLocation, diag::note_member_synthesized_at) 4369 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4370 Constructor->setInvalidDecl(); 4371 return; 4372 } 4373 4374 SourceLocation Loc = Constructor->getLocation(); 4375 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4376 4377 Constructor->setUsed(); 4378 MarkVTableUsed(CurrentLocation, ClassDecl); 4379} 4380 4381CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4382 // C++ [class.dtor]p2: 4383 // If a class has no user-declared destructor, a destructor is 4384 // declared implicitly. An implicitly-declared destructor is an 4385 // inline public member of its class. 4386 4387 // C++ [except.spec]p14: 4388 // An implicitly declared special member function (Clause 12) shall have 4389 // an exception-specification. 4390 ImplicitExceptionSpecification ExceptSpec(Context); 4391 4392 // Direct base-class destructors. 4393 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4394 BEnd = ClassDecl->bases_end(); 4395 B != BEnd; ++B) { 4396 if (B->isVirtual()) // Handled below. 4397 continue; 4398 4399 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4400 ExceptSpec.CalledDecl( 4401 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4402 } 4403 4404 // Virtual base-class destructors. 4405 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4406 BEnd = ClassDecl->vbases_end(); 4407 B != BEnd; ++B) { 4408 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4409 ExceptSpec.CalledDecl( 4410 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4411 } 4412 4413 // Field destructors. 4414 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4415 FEnd = ClassDecl->field_end(); 4416 F != FEnd; ++F) { 4417 if (const RecordType *RecordTy 4418 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4419 ExceptSpec.CalledDecl( 4420 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4421 } 4422 4423 // Create the actual destructor declaration. 4424 QualType Ty = Context.getFunctionType(Context.VoidTy, 4425 0, 0, false, 0, 4426 ExceptSpec.hasExceptionSpecification(), 4427 ExceptSpec.hasAnyExceptionSpecification(), 4428 ExceptSpec.size(), 4429 ExceptSpec.data(), 4430 FunctionType::ExtInfo()); 4431 4432 CanQualType ClassType 4433 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4434 DeclarationName Name 4435 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4436 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4437 CXXDestructorDecl *Destructor 4438 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4439 /*isInline=*/true, 4440 /*isImplicitlyDeclared=*/true); 4441 Destructor->setAccess(AS_public); 4442 Destructor->setImplicit(); 4443 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4444 4445 // Note that we have declared this destructor. 4446 ++ASTContext::NumImplicitDestructorsDeclared; 4447 4448 // Introduce this destructor into its scope. 4449 if (Scope *S = getScopeForContext(ClassDecl)) 4450 PushOnScopeChains(Destructor, S, false); 4451 ClassDecl->addDecl(Destructor); 4452 4453 // This could be uniqued if it ever proves significant. 4454 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4455 4456 AddOverriddenMethods(ClassDecl, Destructor); 4457 4458 return Destructor; 4459} 4460 4461void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4462 CXXDestructorDecl *Destructor) { 4463 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4464 "DefineImplicitDestructor - call it for implicit default dtor"); 4465 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4466 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4467 4468 if (Destructor->isInvalidDecl()) 4469 return; 4470 4471 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4472 4473 ErrorTrap Trap(*this); 4474 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4475 Destructor->getParent()); 4476 4477 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4478 Diag(CurrentLocation, diag::note_member_synthesized_at) 4479 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4480 4481 Destructor->setInvalidDecl(); 4482 return; 4483 } 4484 4485 SourceLocation Loc = Destructor->getLocation(); 4486 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4487 4488 Destructor->setUsed(); 4489 MarkVTableUsed(CurrentLocation, ClassDecl); 4490} 4491 4492/// \brief Builds a statement that copies the given entity from \p From to 4493/// \c To. 4494/// 4495/// This routine is used to copy the members of a class with an 4496/// implicitly-declared copy assignment operator. When the entities being 4497/// copied are arrays, this routine builds for loops to copy them. 4498/// 4499/// \param S The Sema object used for type-checking. 4500/// 4501/// \param Loc The location where the implicit copy is being generated. 4502/// 4503/// \param T The type of the expressions being copied. Both expressions must 4504/// have this type. 4505/// 4506/// \param To The expression we are copying to. 4507/// 4508/// \param From The expression we are copying from. 4509/// 4510/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4511/// Otherwise, it's a non-static member subobject. 4512/// 4513/// \param Depth Internal parameter recording the depth of the recursion. 4514/// 4515/// \returns A statement or a loop that copies the expressions. 4516static StmtResult 4517BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4518 Expr *To, Expr *From, 4519 bool CopyingBaseSubobject, unsigned Depth = 0) { 4520 // C++0x [class.copy]p30: 4521 // Each subobject is assigned in the manner appropriate to its type: 4522 // 4523 // - if the subobject is of class type, the copy assignment operator 4524 // for the class is used (as if by explicit qualification; that is, 4525 // ignoring any possible virtual overriding functions in more derived 4526 // classes); 4527 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4528 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4529 4530 // Look for operator=. 4531 DeclarationName Name 4532 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4533 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4534 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4535 4536 // Filter out any result that isn't a copy-assignment operator. 4537 LookupResult::Filter F = OpLookup.makeFilter(); 4538 while (F.hasNext()) { 4539 NamedDecl *D = F.next(); 4540 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4541 if (Method->isCopyAssignmentOperator()) 4542 continue; 4543 4544 F.erase(); 4545 } 4546 F.done(); 4547 4548 // Suppress the protected check (C++ [class.protected]) for each of the 4549 // assignment operators we found. This strange dance is required when 4550 // we're assigning via a base classes's copy-assignment operator. To 4551 // ensure that we're getting the right base class subobject (without 4552 // ambiguities), we need to cast "this" to that subobject type; to 4553 // ensure that we don't go through the virtual call mechanism, we need 4554 // to qualify the operator= name with the base class (see below). However, 4555 // this means that if the base class has a protected copy assignment 4556 // operator, the protected member access check will fail. So, we 4557 // rewrite "protected" access to "public" access in this case, since we 4558 // know by construction that we're calling from a derived class. 4559 if (CopyingBaseSubobject) { 4560 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4561 L != LEnd; ++L) { 4562 if (L.getAccess() == AS_protected) 4563 L.setAccess(AS_public); 4564 } 4565 } 4566 4567 // Create the nested-name-specifier that will be used to qualify the 4568 // reference to operator=; this is required to suppress the virtual 4569 // call mechanism. 4570 CXXScopeSpec SS; 4571 SS.setRange(Loc); 4572 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4573 T.getTypePtr())); 4574 4575 // Create the reference to operator=. 4576 ExprResult OpEqualRef 4577 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4578 /*FirstQualifierInScope=*/0, OpLookup, 4579 /*TemplateArgs=*/0, 4580 /*SuppressQualifierCheck=*/true); 4581 if (OpEqualRef.isInvalid()) 4582 return StmtError(); 4583 4584 // Build the call to the assignment operator. 4585 4586 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4587 OpEqualRef.takeAs<Expr>(), 4588 Loc, &From, 1, Loc); 4589 if (Call.isInvalid()) 4590 return StmtError(); 4591 4592 return S.Owned(Call.takeAs<Stmt>()); 4593 } 4594 4595 // - if the subobject is of scalar type, the built-in assignment 4596 // operator is used. 4597 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4598 if (!ArrayTy) { 4599 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4600 if (Assignment.isInvalid()) 4601 return StmtError(); 4602 4603 return S.Owned(Assignment.takeAs<Stmt>()); 4604 } 4605 4606 // - if the subobject is an array, each element is assigned, in the 4607 // manner appropriate to the element type; 4608 4609 // Construct a loop over the array bounds, e.g., 4610 // 4611 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4612 // 4613 // that will copy each of the array elements. 4614 QualType SizeType = S.Context.getSizeType(); 4615 4616 // Create the iteration variable. 4617 IdentifierInfo *IterationVarName = 0; 4618 { 4619 llvm::SmallString<8> Str; 4620 llvm::raw_svector_ostream OS(Str); 4621 OS << "__i" << Depth; 4622 IterationVarName = &S.Context.Idents.get(OS.str()); 4623 } 4624 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4625 IterationVarName, SizeType, 4626 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4627 SC_None, SC_None); 4628 4629 // Initialize the iteration variable to zero. 4630 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4631 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4632 4633 // Create a reference to the iteration variable; we'll use this several 4634 // times throughout. 4635 Expr *IterationVarRef 4636 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4637 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4638 4639 // Create the DeclStmt that holds the iteration variable. 4640 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4641 4642 // Create the comparison against the array bound. 4643 llvm::APInt Upper = ArrayTy->getSize(); 4644 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4645 Expr *Comparison 4646 = new (S.Context) BinaryOperator(IterationVarRef, 4647 IntegerLiteral::Create(S.Context, 4648 Upper, SizeType, Loc), 4649 BO_NE, S.Context.BoolTy, Loc); 4650 4651 // Create the pre-increment of the iteration variable. 4652 Expr *Increment 4653 = new (S.Context) UnaryOperator(IterationVarRef, 4654 UO_PreInc, 4655 SizeType, Loc); 4656 4657 // Subscript the "from" and "to" expressions with the iteration variable. 4658 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4659 IterationVarRef, Loc)); 4660 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4661 IterationVarRef, Loc)); 4662 4663 // Build the copy for an individual element of the array. 4664 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4665 ArrayTy->getElementType(), 4666 To, From, 4667 CopyingBaseSubobject, Depth+1); 4668 if (Copy.isInvalid()) 4669 return StmtError(); 4670 4671 // Construct the loop that copies all elements of this array. 4672 return S.ActOnForStmt(Loc, Loc, InitStmt, 4673 S.MakeFullExpr(Comparison), 4674 0, S.MakeFullExpr(Increment), 4675 Loc, Copy.take()); 4676} 4677 4678/// \brief Determine whether the given class has a copy assignment operator 4679/// that accepts a const-qualified argument. 4680static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4681 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4682 4683 if (!Class->hasDeclaredCopyAssignment()) 4684 S.DeclareImplicitCopyAssignment(Class); 4685 4686 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4687 DeclarationName OpName 4688 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4689 4690 DeclContext::lookup_const_iterator Op, OpEnd; 4691 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4692 // C++ [class.copy]p9: 4693 // A user-declared copy assignment operator is a non-static non-template 4694 // member function of class X with exactly one parameter of type X, X&, 4695 // const X&, volatile X& or const volatile X&. 4696 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4697 if (!Method) 4698 continue; 4699 4700 if (Method->isStatic()) 4701 continue; 4702 if (Method->getPrimaryTemplate()) 4703 continue; 4704 const FunctionProtoType *FnType = 4705 Method->getType()->getAs<FunctionProtoType>(); 4706 assert(FnType && "Overloaded operator has no prototype."); 4707 // Don't assert on this; an invalid decl might have been left in the AST. 4708 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4709 continue; 4710 bool AcceptsConst = true; 4711 QualType ArgType = FnType->getArgType(0); 4712 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4713 ArgType = Ref->getPointeeType(); 4714 // Is it a non-const lvalue reference? 4715 if (!ArgType.isConstQualified()) 4716 AcceptsConst = false; 4717 } 4718 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4719 continue; 4720 4721 // We have a single argument of type cv X or cv X&, i.e. we've found the 4722 // copy assignment operator. Return whether it accepts const arguments. 4723 return AcceptsConst; 4724 } 4725 assert(Class->isInvalidDecl() && 4726 "No copy assignment operator declared in valid code."); 4727 return false; 4728} 4729 4730CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4731 // Note: The following rules are largely analoguous to the copy 4732 // constructor rules. Note that virtual bases are not taken into account 4733 // for determining the argument type of the operator. Note also that 4734 // operators taking an object instead of a reference are allowed. 4735 4736 4737 // C++ [class.copy]p10: 4738 // If the class definition does not explicitly declare a copy 4739 // assignment operator, one is declared implicitly. 4740 // The implicitly-defined copy assignment operator for a class X 4741 // will have the form 4742 // 4743 // X& X::operator=(const X&) 4744 // 4745 // if 4746 bool HasConstCopyAssignment = true; 4747 4748 // -- each direct base class B of X has a copy assignment operator 4749 // whose parameter is of type const B&, const volatile B& or B, 4750 // and 4751 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4752 BaseEnd = ClassDecl->bases_end(); 4753 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4754 assert(!Base->getType()->isDependentType() && 4755 "Cannot generate implicit members for class with dependent bases."); 4756 const CXXRecordDecl *BaseClassDecl 4757 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4758 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4759 } 4760 4761 // -- for all the nonstatic data members of X that are of a class 4762 // type M (or array thereof), each such class type has a copy 4763 // assignment operator whose parameter is of type const M&, 4764 // const volatile M& or M. 4765 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4766 FieldEnd = ClassDecl->field_end(); 4767 HasConstCopyAssignment && Field != FieldEnd; 4768 ++Field) { 4769 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4770 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4771 const CXXRecordDecl *FieldClassDecl 4772 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4773 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4774 } 4775 } 4776 4777 // Otherwise, the implicitly declared copy assignment operator will 4778 // have the form 4779 // 4780 // X& X::operator=(X&) 4781 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4782 QualType RetType = Context.getLValueReferenceType(ArgType); 4783 if (HasConstCopyAssignment) 4784 ArgType = ArgType.withConst(); 4785 ArgType = Context.getLValueReferenceType(ArgType); 4786 4787 // C++ [except.spec]p14: 4788 // An implicitly declared special member function (Clause 12) shall have an 4789 // exception-specification. [...] 4790 ImplicitExceptionSpecification ExceptSpec(Context); 4791 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4792 BaseEnd = ClassDecl->bases_end(); 4793 Base != BaseEnd; ++Base) { 4794 CXXRecordDecl *BaseClassDecl 4795 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4796 4797 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4798 DeclareImplicitCopyAssignment(BaseClassDecl); 4799 4800 if (CXXMethodDecl *CopyAssign 4801 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4802 ExceptSpec.CalledDecl(CopyAssign); 4803 } 4804 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4805 FieldEnd = ClassDecl->field_end(); 4806 Field != FieldEnd; 4807 ++Field) { 4808 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4809 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4810 CXXRecordDecl *FieldClassDecl 4811 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4812 4813 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4814 DeclareImplicitCopyAssignment(FieldClassDecl); 4815 4816 if (CXXMethodDecl *CopyAssign 4817 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4818 ExceptSpec.CalledDecl(CopyAssign); 4819 } 4820 } 4821 4822 // An implicitly-declared copy assignment operator is an inline public 4823 // member of its class. 4824 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4825 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4826 CXXMethodDecl *CopyAssignment 4827 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4828 Context.getFunctionType(RetType, &ArgType, 1, 4829 false, 0, 4830 ExceptSpec.hasExceptionSpecification(), 4831 ExceptSpec.hasAnyExceptionSpecification(), 4832 ExceptSpec.size(), 4833 ExceptSpec.data(), 4834 FunctionType::ExtInfo()), 4835 /*TInfo=*/0, /*isStatic=*/false, 4836 /*StorageClassAsWritten=*/SC_None, 4837 /*isInline=*/true); 4838 CopyAssignment->setAccess(AS_public); 4839 CopyAssignment->setImplicit(); 4840 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4841 4842 // Add the parameter to the operator. 4843 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4844 ClassDecl->getLocation(), 4845 /*Id=*/0, 4846 ArgType, /*TInfo=*/0, 4847 SC_None, 4848 SC_None, 0); 4849 CopyAssignment->setParams(&FromParam, 1); 4850 4851 // Note that we have added this copy-assignment operator. 4852 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4853 4854 if (Scope *S = getScopeForContext(ClassDecl)) 4855 PushOnScopeChains(CopyAssignment, S, false); 4856 ClassDecl->addDecl(CopyAssignment); 4857 4858 AddOverriddenMethods(ClassDecl, CopyAssignment); 4859 return CopyAssignment; 4860} 4861 4862void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4863 CXXMethodDecl *CopyAssignOperator) { 4864 assert((CopyAssignOperator->isImplicit() && 4865 CopyAssignOperator->isOverloadedOperator() && 4866 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4867 !CopyAssignOperator->isUsed(false)) && 4868 "DefineImplicitCopyAssignment called for wrong function"); 4869 4870 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4871 4872 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4873 CopyAssignOperator->setInvalidDecl(); 4874 return; 4875 } 4876 4877 CopyAssignOperator->setUsed(); 4878 4879 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4880 ErrorTrap Trap(*this); 4881 4882 // C++0x [class.copy]p30: 4883 // The implicitly-defined or explicitly-defaulted copy assignment operator 4884 // for a non-union class X performs memberwise copy assignment of its 4885 // subobjects. The direct base classes of X are assigned first, in the 4886 // order of their declaration in the base-specifier-list, and then the 4887 // immediate non-static data members of X are assigned, in the order in 4888 // which they were declared in the class definition. 4889 4890 // The statements that form the synthesized function body. 4891 ASTOwningVector<Stmt*> Statements(*this); 4892 4893 // The parameter for the "other" object, which we are copying from. 4894 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4895 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4896 QualType OtherRefType = Other->getType(); 4897 if (const LValueReferenceType *OtherRef 4898 = OtherRefType->getAs<LValueReferenceType>()) { 4899 OtherRefType = OtherRef->getPointeeType(); 4900 OtherQuals = OtherRefType.getQualifiers(); 4901 } 4902 4903 // Our location for everything implicitly-generated. 4904 SourceLocation Loc = CopyAssignOperator->getLocation(); 4905 4906 // Construct a reference to the "other" object. We'll be using this 4907 // throughout the generated ASTs. 4908 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4909 assert(OtherRef && "Reference to parameter cannot fail!"); 4910 4911 // Construct the "this" pointer. We'll be using this throughout the generated 4912 // ASTs. 4913 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4914 assert(This && "Reference to this cannot fail!"); 4915 4916 // Assign base classes. 4917 bool Invalid = false; 4918 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4919 E = ClassDecl->bases_end(); Base != E; ++Base) { 4920 // Form the assignment: 4921 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4922 QualType BaseType = Base->getType().getUnqualifiedType(); 4923 CXXRecordDecl *BaseClassDecl = 0; 4924 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4925 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4926 else { 4927 Invalid = true; 4928 continue; 4929 } 4930 4931 CXXCastPath BasePath; 4932 BasePath.push_back(Base); 4933 4934 // Construct the "from" expression, which is an implicit cast to the 4935 // appropriately-qualified base type. 4936 Expr *From = OtherRef; 4937 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4938 CK_UncheckedDerivedToBase, 4939 VK_LValue, &BasePath); 4940 4941 // Dereference "this". 4942 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4943 4944 // Implicitly cast "this" to the appropriately-qualified base type. 4945 Expr *ToE = To.takeAs<Expr>(); 4946 ImpCastExprToType(ToE, 4947 Context.getCVRQualifiedType(BaseType, 4948 CopyAssignOperator->getTypeQualifiers()), 4949 CK_UncheckedDerivedToBase, 4950 VK_LValue, &BasePath); 4951 To = Owned(ToE); 4952 4953 // Build the copy. 4954 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4955 To.get(), From, 4956 /*CopyingBaseSubobject=*/true); 4957 if (Copy.isInvalid()) { 4958 Diag(CurrentLocation, diag::note_member_synthesized_at) 4959 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4960 CopyAssignOperator->setInvalidDecl(); 4961 return; 4962 } 4963 4964 // Success! Record the copy. 4965 Statements.push_back(Copy.takeAs<Expr>()); 4966 } 4967 4968 // \brief Reference to the __builtin_memcpy function. 4969 Expr *BuiltinMemCpyRef = 0; 4970 // \brief Reference to the __builtin_objc_memmove_collectable function. 4971 Expr *CollectableMemCpyRef = 0; 4972 4973 // Assign non-static members. 4974 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4975 FieldEnd = ClassDecl->field_end(); 4976 Field != FieldEnd; ++Field) { 4977 // Check for members of reference type; we can't copy those. 4978 if (Field->getType()->isReferenceType()) { 4979 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4980 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4981 Diag(Field->getLocation(), diag::note_declared_at); 4982 Diag(CurrentLocation, diag::note_member_synthesized_at) 4983 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4984 Invalid = true; 4985 continue; 4986 } 4987 4988 // Check for members of const-qualified, non-class type. 4989 QualType BaseType = Context.getBaseElementType(Field->getType()); 4990 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4991 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4992 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4993 Diag(Field->getLocation(), diag::note_declared_at); 4994 Diag(CurrentLocation, diag::note_member_synthesized_at) 4995 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4996 Invalid = true; 4997 continue; 4998 } 4999 5000 QualType FieldType = Field->getType().getNonReferenceType(); 5001 if (FieldType->isIncompleteArrayType()) { 5002 assert(ClassDecl->hasFlexibleArrayMember() && 5003 "Incomplete array type is not valid"); 5004 continue; 5005 } 5006 5007 // Build references to the field in the object we're copying from and to. 5008 CXXScopeSpec SS; // Intentionally empty 5009 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5010 LookupMemberName); 5011 MemberLookup.addDecl(*Field); 5012 MemberLookup.resolveKind(); 5013 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5014 Loc, /*IsArrow=*/false, 5015 SS, 0, MemberLookup, 0); 5016 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5017 Loc, /*IsArrow=*/true, 5018 SS, 0, MemberLookup, 0); 5019 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5020 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5021 5022 // If the field should be copied with __builtin_memcpy rather than via 5023 // explicit assignments, do so. This optimization only applies for arrays 5024 // of scalars and arrays of class type with trivial copy-assignment 5025 // operators. 5026 if (FieldType->isArrayType() && 5027 (!BaseType->isRecordType() || 5028 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5029 ->hasTrivialCopyAssignment())) { 5030 // Compute the size of the memory buffer to be copied. 5031 QualType SizeType = Context.getSizeType(); 5032 llvm::APInt Size(Context.getTypeSize(SizeType), 5033 Context.getTypeSizeInChars(BaseType).getQuantity()); 5034 for (const ConstantArrayType *Array 5035 = Context.getAsConstantArrayType(FieldType); 5036 Array; 5037 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5038 llvm::APInt ArraySize = Array->getSize(); 5039 ArraySize.zextOrTrunc(Size.getBitWidth()); 5040 Size *= ArraySize; 5041 } 5042 5043 // Take the address of the field references for "from" and "to". 5044 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5045 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5046 5047 bool NeedsCollectableMemCpy = 5048 (BaseType->isRecordType() && 5049 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5050 5051 if (NeedsCollectableMemCpy) { 5052 if (!CollectableMemCpyRef) { 5053 // Create a reference to the __builtin_objc_memmove_collectable function. 5054 LookupResult R(*this, 5055 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5056 Loc, LookupOrdinaryName); 5057 LookupName(R, TUScope, true); 5058 5059 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5060 if (!CollectableMemCpy) { 5061 // Something went horribly wrong earlier, and we will have 5062 // complained about it. 5063 Invalid = true; 5064 continue; 5065 } 5066 5067 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5068 CollectableMemCpy->getType(), 5069 Loc, 0).takeAs<Expr>(); 5070 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5071 } 5072 } 5073 // Create a reference to the __builtin_memcpy builtin function. 5074 else if (!BuiltinMemCpyRef) { 5075 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5076 LookupOrdinaryName); 5077 LookupName(R, TUScope, true); 5078 5079 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5080 if (!BuiltinMemCpy) { 5081 // Something went horribly wrong earlier, and we will have complained 5082 // about it. 5083 Invalid = true; 5084 continue; 5085 } 5086 5087 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5088 BuiltinMemCpy->getType(), 5089 Loc, 0).takeAs<Expr>(); 5090 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5091 } 5092 5093 ASTOwningVector<Expr*> CallArgs(*this); 5094 CallArgs.push_back(To.takeAs<Expr>()); 5095 CallArgs.push_back(From.takeAs<Expr>()); 5096 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5097 ExprResult Call = ExprError(); 5098 if (NeedsCollectableMemCpy) 5099 Call = ActOnCallExpr(/*Scope=*/0, 5100 CollectableMemCpyRef, 5101 Loc, move_arg(CallArgs), 5102 Loc); 5103 else 5104 Call = ActOnCallExpr(/*Scope=*/0, 5105 BuiltinMemCpyRef, 5106 Loc, move_arg(CallArgs), 5107 Loc); 5108 5109 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5110 Statements.push_back(Call.takeAs<Expr>()); 5111 continue; 5112 } 5113 5114 // Build the copy of this field. 5115 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5116 To.get(), From.get(), 5117 /*CopyingBaseSubobject=*/false); 5118 if (Copy.isInvalid()) { 5119 Diag(CurrentLocation, diag::note_member_synthesized_at) 5120 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5121 CopyAssignOperator->setInvalidDecl(); 5122 return; 5123 } 5124 5125 // Success! Record the copy. 5126 Statements.push_back(Copy.takeAs<Stmt>()); 5127 } 5128 5129 if (!Invalid) { 5130 // Add a "return *this;" 5131 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5132 5133 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5134 if (Return.isInvalid()) 5135 Invalid = true; 5136 else { 5137 Statements.push_back(Return.takeAs<Stmt>()); 5138 5139 if (Trap.hasErrorOccurred()) { 5140 Diag(CurrentLocation, diag::note_member_synthesized_at) 5141 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5142 Invalid = true; 5143 } 5144 } 5145 } 5146 5147 if (Invalid) { 5148 CopyAssignOperator->setInvalidDecl(); 5149 return; 5150 } 5151 5152 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5153 /*isStmtExpr=*/false); 5154 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5155 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5156} 5157 5158CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5159 CXXRecordDecl *ClassDecl) { 5160 // C++ [class.copy]p4: 5161 // If the class definition does not explicitly declare a copy 5162 // constructor, one is declared implicitly. 5163 5164 // C++ [class.copy]p5: 5165 // The implicitly-declared copy constructor for a class X will 5166 // have the form 5167 // 5168 // X::X(const X&) 5169 // 5170 // if 5171 bool HasConstCopyConstructor = true; 5172 5173 // -- each direct or virtual base class B of X has a copy 5174 // constructor whose first parameter is of type const B& or 5175 // const volatile B&, and 5176 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5177 BaseEnd = ClassDecl->bases_end(); 5178 HasConstCopyConstructor && Base != BaseEnd; 5179 ++Base) { 5180 // Virtual bases are handled below. 5181 if (Base->isVirtual()) 5182 continue; 5183 5184 CXXRecordDecl *BaseClassDecl 5185 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5186 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5187 DeclareImplicitCopyConstructor(BaseClassDecl); 5188 5189 HasConstCopyConstructor 5190 = BaseClassDecl->hasConstCopyConstructor(Context); 5191 } 5192 5193 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5194 BaseEnd = ClassDecl->vbases_end(); 5195 HasConstCopyConstructor && Base != BaseEnd; 5196 ++Base) { 5197 CXXRecordDecl *BaseClassDecl 5198 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5199 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5200 DeclareImplicitCopyConstructor(BaseClassDecl); 5201 5202 HasConstCopyConstructor 5203 = BaseClassDecl->hasConstCopyConstructor(Context); 5204 } 5205 5206 // -- for all the nonstatic data members of X that are of a 5207 // class type M (or array thereof), each such class type 5208 // has a copy constructor whose first parameter is of type 5209 // const M& or const volatile M&. 5210 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5211 FieldEnd = ClassDecl->field_end(); 5212 HasConstCopyConstructor && Field != FieldEnd; 5213 ++Field) { 5214 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5215 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5216 CXXRecordDecl *FieldClassDecl 5217 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5218 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5219 DeclareImplicitCopyConstructor(FieldClassDecl); 5220 5221 HasConstCopyConstructor 5222 = FieldClassDecl->hasConstCopyConstructor(Context); 5223 } 5224 } 5225 5226 // Otherwise, the implicitly declared copy constructor will have 5227 // the form 5228 // 5229 // X::X(X&) 5230 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5231 QualType ArgType = ClassType; 5232 if (HasConstCopyConstructor) 5233 ArgType = ArgType.withConst(); 5234 ArgType = Context.getLValueReferenceType(ArgType); 5235 5236 // C++ [except.spec]p14: 5237 // An implicitly declared special member function (Clause 12) shall have an 5238 // exception-specification. [...] 5239 ImplicitExceptionSpecification ExceptSpec(Context); 5240 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5241 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5242 BaseEnd = ClassDecl->bases_end(); 5243 Base != BaseEnd; 5244 ++Base) { 5245 // Virtual bases are handled below. 5246 if (Base->isVirtual()) 5247 continue; 5248 5249 CXXRecordDecl *BaseClassDecl 5250 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5251 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5252 DeclareImplicitCopyConstructor(BaseClassDecl); 5253 5254 if (CXXConstructorDecl *CopyConstructor 5255 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5256 ExceptSpec.CalledDecl(CopyConstructor); 5257 } 5258 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5259 BaseEnd = ClassDecl->vbases_end(); 5260 Base != BaseEnd; 5261 ++Base) { 5262 CXXRecordDecl *BaseClassDecl 5263 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5264 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5265 DeclareImplicitCopyConstructor(BaseClassDecl); 5266 5267 if (CXXConstructorDecl *CopyConstructor 5268 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5269 ExceptSpec.CalledDecl(CopyConstructor); 5270 } 5271 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5272 FieldEnd = ClassDecl->field_end(); 5273 Field != FieldEnd; 5274 ++Field) { 5275 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5276 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5277 CXXRecordDecl *FieldClassDecl 5278 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5279 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5280 DeclareImplicitCopyConstructor(FieldClassDecl); 5281 5282 if (CXXConstructorDecl *CopyConstructor 5283 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5284 ExceptSpec.CalledDecl(CopyConstructor); 5285 } 5286 } 5287 5288 // An implicitly-declared copy constructor is an inline public 5289 // member of its class. 5290 DeclarationName Name 5291 = Context.DeclarationNames.getCXXConstructorName( 5292 Context.getCanonicalType(ClassType)); 5293 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5294 CXXConstructorDecl *CopyConstructor 5295 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5296 Context.getFunctionType(Context.VoidTy, 5297 &ArgType, 1, 5298 false, 0, 5299 ExceptSpec.hasExceptionSpecification(), 5300 ExceptSpec.hasAnyExceptionSpecification(), 5301 ExceptSpec.size(), 5302 ExceptSpec.data(), 5303 FunctionType::ExtInfo()), 5304 /*TInfo=*/0, 5305 /*isExplicit=*/false, 5306 /*isInline=*/true, 5307 /*isImplicitlyDeclared=*/true); 5308 CopyConstructor->setAccess(AS_public); 5309 CopyConstructor->setImplicit(); 5310 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5311 5312 // Note that we have declared this constructor. 5313 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5314 5315 // Add the parameter to the constructor. 5316 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5317 ClassDecl->getLocation(), 5318 /*IdentifierInfo=*/0, 5319 ArgType, /*TInfo=*/0, 5320 SC_None, 5321 SC_None, 0); 5322 CopyConstructor->setParams(&FromParam, 1); 5323 if (Scope *S = getScopeForContext(ClassDecl)) 5324 PushOnScopeChains(CopyConstructor, S, false); 5325 ClassDecl->addDecl(CopyConstructor); 5326 5327 return CopyConstructor; 5328} 5329 5330void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5331 CXXConstructorDecl *CopyConstructor, 5332 unsigned TypeQuals) { 5333 assert((CopyConstructor->isImplicit() && 5334 CopyConstructor->isCopyConstructor(TypeQuals) && 5335 !CopyConstructor->isUsed(false)) && 5336 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5337 5338 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5339 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5340 5341 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5342 ErrorTrap Trap(*this); 5343 5344 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5345 Trap.hasErrorOccurred()) { 5346 Diag(CurrentLocation, diag::note_member_synthesized_at) 5347 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5348 CopyConstructor->setInvalidDecl(); 5349 } else { 5350 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5351 CopyConstructor->getLocation(), 5352 MultiStmtArg(*this, 0, 0), 5353 /*isStmtExpr=*/false) 5354 .takeAs<Stmt>()); 5355 } 5356 5357 CopyConstructor->setUsed(); 5358} 5359 5360ExprResult 5361Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5362 CXXConstructorDecl *Constructor, 5363 MultiExprArg ExprArgs, 5364 bool RequiresZeroInit, 5365 unsigned ConstructKind, 5366 SourceRange ParenRange) { 5367 bool Elidable = false; 5368 5369 // C++0x [class.copy]p34: 5370 // When certain criteria are met, an implementation is allowed to 5371 // omit the copy/move construction of a class object, even if the 5372 // copy/move constructor and/or destructor for the object have 5373 // side effects. [...] 5374 // - when a temporary class object that has not been bound to a 5375 // reference (12.2) would be copied/moved to a class object 5376 // with the same cv-unqualified type, the copy/move operation 5377 // can be omitted by constructing the temporary object 5378 // directly into the target of the omitted copy/move 5379 if (ConstructKind == CXXConstructExpr::CK_Complete && 5380 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5381 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5382 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5383 } 5384 5385 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5386 Elidable, move(ExprArgs), RequiresZeroInit, 5387 ConstructKind, ParenRange); 5388} 5389 5390/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5391/// including handling of its default argument expressions. 5392ExprResult 5393Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5394 CXXConstructorDecl *Constructor, bool Elidable, 5395 MultiExprArg ExprArgs, 5396 bool RequiresZeroInit, 5397 unsigned ConstructKind, 5398 SourceRange ParenRange) { 5399 unsigned NumExprs = ExprArgs.size(); 5400 Expr **Exprs = (Expr **)ExprArgs.release(); 5401 5402 MarkDeclarationReferenced(ConstructLoc, Constructor); 5403 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5404 Constructor, Elidable, Exprs, NumExprs, 5405 RequiresZeroInit, 5406 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5407 ParenRange)); 5408} 5409 5410bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5411 CXXConstructorDecl *Constructor, 5412 MultiExprArg Exprs) { 5413 // FIXME: Provide the correct paren SourceRange when available. 5414 ExprResult TempResult = 5415 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5416 move(Exprs), false, CXXConstructExpr::CK_Complete, 5417 SourceRange()); 5418 if (TempResult.isInvalid()) 5419 return true; 5420 5421 Expr *Temp = TempResult.takeAs<Expr>(); 5422 CheckImplicitConversions(Temp, VD->getLocation()); 5423 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5424 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5425 VD->setInit(Temp); 5426 5427 return false; 5428} 5429 5430void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5431 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5432 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5433 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5434 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5435 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5436 CheckDestructorAccess(VD->getLocation(), Destructor, 5437 PDiag(diag::err_access_dtor_var) 5438 << VD->getDeclName() 5439 << VD->getType()); 5440 5441 // TODO: this should be re-enabled for static locals by !CXAAtExit 5442 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5443 Diag(VD->getLocation(), diag::warn_global_destructor); 5444 } 5445} 5446 5447/// AddCXXDirectInitializerToDecl - This action is called immediately after 5448/// ActOnDeclarator, when a C++ direct initializer is present. 5449/// e.g: "int x(1);" 5450void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5451 SourceLocation LParenLoc, 5452 MultiExprArg Exprs, 5453 SourceLocation RParenLoc) { 5454 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5455 5456 // If there is no declaration, there was an error parsing it. Just ignore 5457 // the initializer. 5458 if (RealDecl == 0) 5459 return; 5460 5461 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5462 if (!VDecl) { 5463 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5464 RealDecl->setInvalidDecl(); 5465 return; 5466 } 5467 5468 // We will represent direct-initialization similarly to copy-initialization: 5469 // int x(1); -as-> int x = 1; 5470 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5471 // 5472 // Clients that want to distinguish between the two forms, can check for 5473 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5474 // A major benefit is that clients that don't particularly care about which 5475 // exactly form was it (like the CodeGen) can handle both cases without 5476 // special case code. 5477 5478 // C++ 8.5p11: 5479 // The form of initialization (using parentheses or '=') is generally 5480 // insignificant, but does matter when the entity being initialized has a 5481 // class type. 5482 5483 if (!VDecl->getType()->isDependentType() && 5484 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5485 diag::err_typecheck_decl_incomplete_type)) { 5486 VDecl->setInvalidDecl(); 5487 return; 5488 } 5489 5490 // The variable can not have an abstract class type. 5491 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5492 diag::err_abstract_type_in_decl, 5493 AbstractVariableType)) 5494 VDecl->setInvalidDecl(); 5495 5496 const VarDecl *Def; 5497 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5498 Diag(VDecl->getLocation(), diag::err_redefinition) 5499 << VDecl->getDeclName(); 5500 Diag(Def->getLocation(), diag::note_previous_definition); 5501 VDecl->setInvalidDecl(); 5502 return; 5503 } 5504 5505 // C++ [class.static.data]p4 5506 // If a static data member is of const integral or const 5507 // enumeration type, its declaration in the class definition can 5508 // specify a constant-initializer which shall be an integral 5509 // constant expression (5.19). In that case, the member can appear 5510 // in integral constant expressions. The member shall still be 5511 // defined in a namespace scope if it is used in the program and the 5512 // namespace scope definition shall not contain an initializer. 5513 // 5514 // We already performed a redefinition check above, but for static 5515 // data members we also need to check whether there was an in-class 5516 // declaration with an initializer. 5517 const VarDecl* PrevInit = 0; 5518 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5519 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5520 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5521 return; 5522 } 5523 5524 // If either the declaration has a dependent type or if any of the 5525 // expressions is type-dependent, we represent the initialization 5526 // via a ParenListExpr for later use during template instantiation. 5527 if (VDecl->getType()->isDependentType() || 5528 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5529 // Let clients know that initialization was done with a direct initializer. 5530 VDecl->setCXXDirectInitializer(true); 5531 5532 // Store the initialization expressions as a ParenListExpr. 5533 unsigned NumExprs = Exprs.size(); 5534 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5535 (Expr **)Exprs.release(), 5536 NumExprs, RParenLoc)); 5537 return; 5538 } 5539 5540 // Capture the variable that is being initialized and the style of 5541 // initialization. 5542 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5543 5544 // FIXME: Poor source location information. 5545 InitializationKind Kind 5546 = InitializationKind::CreateDirect(VDecl->getLocation(), 5547 LParenLoc, RParenLoc); 5548 5549 InitializationSequence InitSeq(*this, Entity, Kind, 5550 Exprs.get(), Exprs.size()); 5551 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5552 if (Result.isInvalid()) { 5553 VDecl->setInvalidDecl(); 5554 return; 5555 } 5556 5557 CheckImplicitConversions(Result.get(), LParenLoc); 5558 5559 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5560 VDecl->setInit(Result.takeAs<Expr>()); 5561 VDecl->setCXXDirectInitializer(true); 5562 5563 if (!VDecl->isInvalidDecl() && 5564 !VDecl->getDeclContext()->isDependentContext() && 5565 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5566 !VDecl->getInit()->isConstantInitializer(Context, 5567 VDecl->getType()->isReferenceType())) 5568 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5569 << VDecl->getInit()->getSourceRange(); 5570 5571 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5572 FinalizeVarWithDestructor(VDecl, Record); 5573} 5574 5575/// \brief Given a constructor and the set of arguments provided for the 5576/// constructor, convert the arguments and add any required default arguments 5577/// to form a proper call to this constructor. 5578/// 5579/// \returns true if an error occurred, false otherwise. 5580bool 5581Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5582 MultiExprArg ArgsPtr, 5583 SourceLocation Loc, 5584 ASTOwningVector<Expr*> &ConvertedArgs) { 5585 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5586 unsigned NumArgs = ArgsPtr.size(); 5587 Expr **Args = (Expr **)ArgsPtr.get(); 5588 5589 const FunctionProtoType *Proto 5590 = Constructor->getType()->getAs<FunctionProtoType>(); 5591 assert(Proto && "Constructor without a prototype?"); 5592 unsigned NumArgsInProto = Proto->getNumArgs(); 5593 5594 // If too few arguments are available, we'll fill in the rest with defaults. 5595 if (NumArgs < NumArgsInProto) 5596 ConvertedArgs.reserve(NumArgsInProto); 5597 else 5598 ConvertedArgs.reserve(NumArgs); 5599 5600 VariadicCallType CallType = 5601 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5602 llvm::SmallVector<Expr *, 8> AllArgs; 5603 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5604 Proto, 0, Args, NumArgs, AllArgs, 5605 CallType); 5606 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5607 ConvertedArgs.push_back(AllArgs[i]); 5608 return Invalid; 5609} 5610 5611static inline bool 5612CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5613 const FunctionDecl *FnDecl) { 5614 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5615 if (isa<NamespaceDecl>(DC)) { 5616 return SemaRef.Diag(FnDecl->getLocation(), 5617 diag::err_operator_new_delete_declared_in_namespace) 5618 << FnDecl->getDeclName(); 5619 } 5620 5621 if (isa<TranslationUnitDecl>(DC) && 5622 FnDecl->getStorageClass() == SC_Static) { 5623 return SemaRef.Diag(FnDecl->getLocation(), 5624 diag::err_operator_new_delete_declared_static) 5625 << FnDecl->getDeclName(); 5626 } 5627 5628 return false; 5629} 5630 5631static inline bool 5632CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5633 CanQualType ExpectedResultType, 5634 CanQualType ExpectedFirstParamType, 5635 unsigned DependentParamTypeDiag, 5636 unsigned InvalidParamTypeDiag) { 5637 QualType ResultType = 5638 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5639 5640 // Check that the result type is not dependent. 5641 if (ResultType->isDependentType()) 5642 return SemaRef.Diag(FnDecl->getLocation(), 5643 diag::err_operator_new_delete_dependent_result_type) 5644 << FnDecl->getDeclName() << ExpectedResultType; 5645 5646 // Check that the result type is what we expect. 5647 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5648 return SemaRef.Diag(FnDecl->getLocation(), 5649 diag::err_operator_new_delete_invalid_result_type) 5650 << FnDecl->getDeclName() << ExpectedResultType; 5651 5652 // A function template must have at least 2 parameters. 5653 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5654 return SemaRef.Diag(FnDecl->getLocation(), 5655 diag::err_operator_new_delete_template_too_few_parameters) 5656 << FnDecl->getDeclName(); 5657 5658 // The function decl must have at least 1 parameter. 5659 if (FnDecl->getNumParams() == 0) 5660 return SemaRef.Diag(FnDecl->getLocation(), 5661 diag::err_operator_new_delete_too_few_parameters) 5662 << FnDecl->getDeclName(); 5663 5664 // Check the the first parameter type is not dependent. 5665 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5666 if (FirstParamType->isDependentType()) 5667 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5668 << FnDecl->getDeclName() << ExpectedFirstParamType; 5669 5670 // Check that the first parameter type is what we expect. 5671 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5672 ExpectedFirstParamType) 5673 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5674 << FnDecl->getDeclName() << ExpectedFirstParamType; 5675 5676 return false; 5677} 5678 5679static bool 5680CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5681 // C++ [basic.stc.dynamic.allocation]p1: 5682 // A program is ill-formed if an allocation function is declared in a 5683 // namespace scope other than global scope or declared static in global 5684 // scope. 5685 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5686 return true; 5687 5688 CanQualType SizeTy = 5689 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5690 5691 // C++ [basic.stc.dynamic.allocation]p1: 5692 // The return type shall be void*. The first parameter shall have type 5693 // std::size_t. 5694 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5695 SizeTy, 5696 diag::err_operator_new_dependent_param_type, 5697 diag::err_operator_new_param_type)) 5698 return true; 5699 5700 // C++ [basic.stc.dynamic.allocation]p1: 5701 // The first parameter shall not have an associated default argument. 5702 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5703 return SemaRef.Diag(FnDecl->getLocation(), 5704 diag::err_operator_new_default_arg) 5705 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5706 5707 return false; 5708} 5709 5710static bool 5711CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5712 // C++ [basic.stc.dynamic.deallocation]p1: 5713 // A program is ill-formed if deallocation functions are declared in a 5714 // namespace scope other than global scope or declared static in global 5715 // scope. 5716 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5717 return true; 5718 5719 // C++ [basic.stc.dynamic.deallocation]p2: 5720 // Each deallocation function shall return void and its first parameter 5721 // shall be void*. 5722 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5723 SemaRef.Context.VoidPtrTy, 5724 diag::err_operator_delete_dependent_param_type, 5725 diag::err_operator_delete_param_type)) 5726 return true; 5727 5728 return false; 5729} 5730 5731/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5732/// of this overloaded operator is well-formed. If so, returns false; 5733/// otherwise, emits appropriate diagnostics and returns true. 5734bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5735 assert(FnDecl && FnDecl->isOverloadedOperator() && 5736 "Expected an overloaded operator declaration"); 5737 5738 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5739 5740 // C++ [over.oper]p5: 5741 // The allocation and deallocation functions, operator new, 5742 // operator new[], operator delete and operator delete[], are 5743 // described completely in 3.7.3. The attributes and restrictions 5744 // found in the rest of this subclause do not apply to them unless 5745 // explicitly stated in 3.7.3. 5746 if (Op == OO_Delete || Op == OO_Array_Delete) 5747 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5748 5749 if (Op == OO_New || Op == OO_Array_New) 5750 return CheckOperatorNewDeclaration(*this, FnDecl); 5751 5752 // C++ [over.oper]p6: 5753 // An operator function shall either be a non-static member 5754 // function or be a non-member function and have at least one 5755 // parameter whose type is a class, a reference to a class, an 5756 // enumeration, or a reference to an enumeration. 5757 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5758 if (MethodDecl->isStatic()) 5759 return Diag(FnDecl->getLocation(), 5760 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5761 } else { 5762 bool ClassOrEnumParam = false; 5763 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5764 ParamEnd = FnDecl->param_end(); 5765 Param != ParamEnd; ++Param) { 5766 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5767 if (ParamType->isDependentType() || ParamType->isRecordType() || 5768 ParamType->isEnumeralType()) { 5769 ClassOrEnumParam = true; 5770 break; 5771 } 5772 } 5773 5774 if (!ClassOrEnumParam) 5775 return Diag(FnDecl->getLocation(), 5776 diag::err_operator_overload_needs_class_or_enum) 5777 << FnDecl->getDeclName(); 5778 } 5779 5780 // C++ [over.oper]p8: 5781 // An operator function cannot have default arguments (8.3.6), 5782 // except where explicitly stated below. 5783 // 5784 // Only the function-call operator allows default arguments 5785 // (C++ [over.call]p1). 5786 if (Op != OO_Call) { 5787 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5788 Param != FnDecl->param_end(); ++Param) { 5789 if ((*Param)->hasDefaultArg()) 5790 return Diag((*Param)->getLocation(), 5791 diag::err_operator_overload_default_arg) 5792 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5793 } 5794 } 5795 5796 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5797 { false, false, false } 5798#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5799 , { Unary, Binary, MemberOnly } 5800#include "clang/Basic/OperatorKinds.def" 5801 }; 5802 5803 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5804 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5805 bool MustBeMemberOperator = OperatorUses[Op][2]; 5806 5807 // C++ [over.oper]p8: 5808 // [...] Operator functions cannot have more or fewer parameters 5809 // than the number required for the corresponding operator, as 5810 // described in the rest of this subclause. 5811 unsigned NumParams = FnDecl->getNumParams() 5812 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5813 if (Op != OO_Call && 5814 ((NumParams == 1 && !CanBeUnaryOperator) || 5815 (NumParams == 2 && !CanBeBinaryOperator) || 5816 (NumParams < 1) || (NumParams > 2))) { 5817 // We have the wrong number of parameters. 5818 unsigned ErrorKind; 5819 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5820 ErrorKind = 2; // 2 -> unary or binary. 5821 } else if (CanBeUnaryOperator) { 5822 ErrorKind = 0; // 0 -> unary 5823 } else { 5824 assert(CanBeBinaryOperator && 5825 "All non-call overloaded operators are unary or binary!"); 5826 ErrorKind = 1; // 1 -> binary 5827 } 5828 5829 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5830 << FnDecl->getDeclName() << NumParams << ErrorKind; 5831 } 5832 5833 // Overloaded operators other than operator() cannot be variadic. 5834 if (Op != OO_Call && 5835 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5836 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5837 << FnDecl->getDeclName(); 5838 } 5839 5840 // Some operators must be non-static member functions. 5841 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5842 return Diag(FnDecl->getLocation(), 5843 diag::err_operator_overload_must_be_member) 5844 << FnDecl->getDeclName(); 5845 } 5846 5847 // C++ [over.inc]p1: 5848 // The user-defined function called operator++ implements the 5849 // prefix and postfix ++ operator. If this function is a member 5850 // function with no parameters, or a non-member function with one 5851 // parameter of class or enumeration type, it defines the prefix 5852 // increment operator ++ for objects of that type. If the function 5853 // is a member function with one parameter (which shall be of type 5854 // int) or a non-member function with two parameters (the second 5855 // of which shall be of type int), it defines the postfix 5856 // increment operator ++ for objects of that type. 5857 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5858 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5859 bool ParamIsInt = false; 5860 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5861 ParamIsInt = BT->getKind() == BuiltinType::Int; 5862 5863 if (!ParamIsInt) 5864 return Diag(LastParam->getLocation(), 5865 diag::err_operator_overload_post_incdec_must_be_int) 5866 << LastParam->getType() << (Op == OO_MinusMinus); 5867 } 5868 5869 return false; 5870} 5871 5872/// CheckLiteralOperatorDeclaration - Check whether the declaration 5873/// of this literal operator function is well-formed. If so, returns 5874/// false; otherwise, emits appropriate diagnostics and returns true. 5875bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5876 DeclContext *DC = FnDecl->getDeclContext(); 5877 Decl::Kind Kind = DC->getDeclKind(); 5878 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5879 Kind != Decl::LinkageSpec) { 5880 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5881 << FnDecl->getDeclName(); 5882 return true; 5883 } 5884 5885 bool Valid = false; 5886 5887 // template <char...> type operator "" name() is the only valid template 5888 // signature, and the only valid signature with no parameters. 5889 if (FnDecl->param_size() == 0) { 5890 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5891 // Must have only one template parameter 5892 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5893 if (Params->size() == 1) { 5894 NonTypeTemplateParmDecl *PmDecl = 5895 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5896 5897 // The template parameter must be a char parameter pack. 5898 // FIXME: This test will always fail because non-type parameter packs 5899 // have not been implemented. 5900 if (PmDecl && PmDecl->isTemplateParameterPack() && 5901 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5902 Valid = true; 5903 } 5904 } 5905 } else { 5906 // Check the first parameter 5907 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5908 5909 QualType T = (*Param)->getType(); 5910 5911 // unsigned long long int, long double, and any character type are allowed 5912 // as the only parameters. 5913 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5914 Context.hasSameType(T, Context.LongDoubleTy) || 5915 Context.hasSameType(T, Context.CharTy) || 5916 Context.hasSameType(T, Context.WCharTy) || 5917 Context.hasSameType(T, Context.Char16Ty) || 5918 Context.hasSameType(T, Context.Char32Ty)) { 5919 if (++Param == FnDecl->param_end()) 5920 Valid = true; 5921 goto FinishedParams; 5922 } 5923 5924 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5925 const PointerType *PT = T->getAs<PointerType>(); 5926 if (!PT) 5927 goto FinishedParams; 5928 T = PT->getPointeeType(); 5929 if (!T.isConstQualified()) 5930 goto FinishedParams; 5931 T = T.getUnqualifiedType(); 5932 5933 // Move on to the second parameter; 5934 ++Param; 5935 5936 // If there is no second parameter, the first must be a const char * 5937 if (Param == FnDecl->param_end()) { 5938 if (Context.hasSameType(T, Context.CharTy)) 5939 Valid = true; 5940 goto FinishedParams; 5941 } 5942 5943 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5944 // are allowed as the first parameter to a two-parameter function 5945 if (!(Context.hasSameType(T, Context.CharTy) || 5946 Context.hasSameType(T, Context.WCharTy) || 5947 Context.hasSameType(T, Context.Char16Ty) || 5948 Context.hasSameType(T, Context.Char32Ty))) 5949 goto FinishedParams; 5950 5951 // The second and final parameter must be an std::size_t 5952 T = (*Param)->getType().getUnqualifiedType(); 5953 if (Context.hasSameType(T, Context.getSizeType()) && 5954 ++Param == FnDecl->param_end()) 5955 Valid = true; 5956 } 5957 5958 // FIXME: This diagnostic is absolutely terrible. 5959FinishedParams: 5960 if (!Valid) { 5961 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5962 << FnDecl->getDeclName(); 5963 return true; 5964 } 5965 5966 return false; 5967} 5968 5969/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5970/// linkage specification, including the language and (if present) 5971/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5972/// the location of the language string literal, which is provided 5973/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5974/// the '{' brace. Otherwise, this linkage specification does not 5975/// have any braces. 5976Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 5977 SourceLocation ExternLoc, 5978 SourceLocation LangLoc, 5979 llvm::StringRef Lang, 5980 SourceLocation LBraceLoc) { 5981 LinkageSpecDecl::LanguageIDs Language; 5982 if (Lang == "\"C\"") 5983 Language = LinkageSpecDecl::lang_c; 5984 else if (Lang == "\"C++\"") 5985 Language = LinkageSpecDecl::lang_cxx; 5986 else { 5987 Diag(LangLoc, diag::err_bad_language); 5988 return 0; 5989 } 5990 5991 // FIXME: Add all the various semantics of linkage specifications 5992 5993 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5994 LangLoc, Language, 5995 LBraceLoc.isValid()); 5996 CurContext->addDecl(D); 5997 PushDeclContext(S, D); 5998 return D; 5999} 6000 6001/// ActOnFinishLinkageSpecification - Complete the definition of 6002/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6003/// valid, it's the position of the closing '}' brace in a linkage 6004/// specification that uses braces. 6005Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6006 Decl *LinkageSpec, 6007 SourceLocation RBraceLoc) { 6008 if (LinkageSpec) 6009 PopDeclContext(); 6010 return LinkageSpec; 6011} 6012 6013/// \brief Perform semantic analysis for the variable declaration that 6014/// occurs within a C++ catch clause, returning the newly-created 6015/// variable. 6016VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6017 TypeSourceInfo *TInfo, 6018 IdentifierInfo *Name, 6019 SourceLocation Loc) { 6020 bool Invalid = false; 6021 QualType ExDeclType = TInfo->getType(); 6022 6023 // Arrays and functions decay. 6024 if (ExDeclType->isArrayType()) 6025 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6026 else if (ExDeclType->isFunctionType()) 6027 ExDeclType = Context.getPointerType(ExDeclType); 6028 6029 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6030 // The exception-declaration shall not denote a pointer or reference to an 6031 // incomplete type, other than [cv] void*. 6032 // N2844 forbids rvalue references. 6033 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6034 Diag(Loc, diag::err_catch_rvalue_ref); 6035 Invalid = true; 6036 } 6037 6038 // GCC allows catching pointers and references to incomplete types 6039 // as an extension; so do we, but we warn by default. 6040 6041 QualType BaseType = ExDeclType; 6042 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6043 unsigned DK = diag::err_catch_incomplete; 6044 bool IncompleteCatchIsInvalid = true; 6045 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6046 BaseType = Ptr->getPointeeType(); 6047 Mode = 1; 6048 DK = diag::ext_catch_incomplete_ptr; 6049 IncompleteCatchIsInvalid = false; 6050 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6051 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6052 BaseType = Ref->getPointeeType(); 6053 Mode = 2; 6054 DK = diag::ext_catch_incomplete_ref; 6055 IncompleteCatchIsInvalid = false; 6056 } 6057 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6058 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6059 IncompleteCatchIsInvalid) 6060 Invalid = true; 6061 6062 if (!Invalid && !ExDeclType->isDependentType() && 6063 RequireNonAbstractType(Loc, ExDeclType, 6064 diag::err_abstract_type_in_decl, 6065 AbstractVariableType)) 6066 Invalid = true; 6067 6068 // Only the non-fragile NeXT runtime currently supports C++ catches 6069 // of ObjC types, and no runtime supports catching ObjC types by value. 6070 if (!Invalid && getLangOptions().ObjC1) { 6071 QualType T = ExDeclType; 6072 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6073 T = RT->getPointeeType(); 6074 6075 if (T->isObjCObjectType()) { 6076 Diag(Loc, diag::err_objc_object_catch); 6077 Invalid = true; 6078 } else if (T->isObjCObjectPointerType()) { 6079 if (!getLangOptions().NeXTRuntime) { 6080 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6081 Invalid = true; 6082 } else if (!getLangOptions().ObjCNonFragileABI) { 6083 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6084 Invalid = true; 6085 } 6086 } 6087 } 6088 6089 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6090 Name, ExDeclType, TInfo, SC_None, 6091 SC_None); 6092 ExDecl->setExceptionVariable(true); 6093 6094 if (!Invalid) { 6095 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6096 // C++ [except.handle]p16: 6097 // The object declared in an exception-declaration or, if the 6098 // exception-declaration does not specify a name, a temporary (12.2) is 6099 // copy-initialized (8.5) from the exception object. [...] 6100 // The object is destroyed when the handler exits, after the destruction 6101 // of any automatic objects initialized within the handler. 6102 // 6103 // We just pretend to initialize the object with itself, then make sure 6104 // it can be destroyed later. 6105 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6106 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6107 Loc, ExDeclType, 0); 6108 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6109 SourceLocation()); 6110 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6111 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6112 MultiExprArg(*this, &ExDeclRef, 1)); 6113 if (Result.isInvalid()) 6114 Invalid = true; 6115 else 6116 FinalizeVarWithDestructor(ExDecl, RecordTy); 6117 } 6118 } 6119 6120 if (Invalid) 6121 ExDecl->setInvalidDecl(); 6122 6123 return ExDecl; 6124} 6125 6126/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6127/// handler. 6128Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6129 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6130 QualType ExDeclType = TInfo->getType(); 6131 6132 bool Invalid = D.isInvalidType(); 6133 IdentifierInfo *II = D.getIdentifier(); 6134 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6135 LookupOrdinaryName, 6136 ForRedeclaration)) { 6137 // The scope should be freshly made just for us. There is just no way 6138 // it contains any previous declaration. 6139 assert(!S->isDeclScope(PrevDecl)); 6140 if (PrevDecl->isTemplateParameter()) { 6141 // Maybe we will complain about the shadowed template parameter. 6142 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6143 } 6144 } 6145 6146 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6147 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6148 << D.getCXXScopeSpec().getRange(); 6149 Invalid = true; 6150 } 6151 6152 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6153 D.getIdentifier(), 6154 D.getIdentifierLoc()); 6155 6156 if (Invalid) 6157 ExDecl->setInvalidDecl(); 6158 6159 // Add the exception declaration into this scope. 6160 if (II) 6161 PushOnScopeChains(ExDecl, S); 6162 else 6163 CurContext->addDecl(ExDecl); 6164 6165 ProcessDeclAttributes(S, ExDecl, D); 6166 return ExDecl; 6167} 6168 6169Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6170 Expr *AssertExpr, 6171 Expr *AssertMessageExpr_) { 6172 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6173 6174 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6175 llvm::APSInt Value(32); 6176 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6177 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6178 AssertExpr->getSourceRange(); 6179 return 0; 6180 } 6181 6182 if (Value == 0) { 6183 Diag(AssertLoc, diag::err_static_assert_failed) 6184 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6185 } 6186 } 6187 6188 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6189 AssertExpr, AssertMessage); 6190 6191 CurContext->addDecl(Decl); 6192 return Decl; 6193} 6194 6195/// \brief Perform semantic analysis of the given friend type declaration. 6196/// 6197/// \returns A friend declaration that. 6198FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6199 TypeSourceInfo *TSInfo) { 6200 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6201 6202 QualType T = TSInfo->getType(); 6203 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6204 6205 if (!getLangOptions().CPlusPlus0x) { 6206 // C++03 [class.friend]p2: 6207 // An elaborated-type-specifier shall be used in a friend declaration 6208 // for a class.* 6209 // 6210 // * The class-key of the elaborated-type-specifier is required. 6211 if (!ActiveTemplateInstantiations.empty()) { 6212 // Do not complain about the form of friend template types during 6213 // template instantiation; we will already have complained when the 6214 // template was declared. 6215 } else if (!T->isElaboratedTypeSpecifier()) { 6216 // If we evaluated the type to a record type, suggest putting 6217 // a tag in front. 6218 if (const RecordType *RT = T->getAs<RecordType>()) { 6219 RecordDecl *RD = RT->getDecl(); 6220 6221 std::string InsertionText = std::string(" ") + RD->getKindName(); 6222 6223 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6224 << (unsigned) RD->getTagKind() 6225 << T 6226 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6227 InsertionText); 6228 } else { 6229 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6230 << T 6231 << SourceRange(FriendLoc, TypeRange.getEnd()); 6232 } 6233 } else if (T->getAs<EnumType>()) { 6234 Diag(FriendLoc, diag::ext_enum_friend) 6235 << T 6236 << SourceRange(FriendLoc, TypeRange.getEnd()); 6237 } 6238 } 6239 6240 // C++0x [class.friend]p3: 6241 // If the type specifier in a friend declaration designates a (possibly 6242 // cv-qualified) class type, that class is declared as a friend; otherwise, 6243 // the friend declaration is ignored. 6244 6245 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6246 // in [class.friend]p3 that we do not implement. 6247 6248 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6249} 6250 6251/// Handle a friend tag declaration where the scope specifier was 6252/// templated. 6253Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6254 unsigned TagSpec, SourceLocation TagLoc, 6255 CXXScopeSpec &SS, 6256 IdentifierInfo *Name, SourceLocation NameLoc, 6257 AttributeList *Attr, 6258 MultiTemplateParamsArg TempParamLists) { 6259 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6260 6261 bool isExplicitSpecialization = false; 6262 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6263 bool Invalid = false; 6264 6265 if (TemplateParameterList *TemplateParams 6266 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6267 TempParamLists.get(), 6268 TempParamLists.size(), 6269 /*friend*/ true, 6270 isExplicitSpecialization, 6271 Invalid)) { 6272 --NumMatchedTemplateParamLists; 6273 6274 if (TemplateParams->size() > 0) { 6275 // This is a declaration of a class template. 6276 if (Invalid) 6277 return 0; 6278 6279 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6280 SS, Name, NameLoc, Attr, 6281 TemplateParams, AS_public).take(); 6282 } else { 6283 // The "template<>" header is extraneous. 6284 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6285 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6286 isExplicitSpecialization = true; 6287 } 6288 } 6289 6290 if (Invalid) return 0; 6291 6292 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6293 6294 bool isAllExplicitSpecializations = true; 6295 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6296 if (TempParamLists.get()[I]->size()) { 6297 isAllExplicitSpecializations = false; 6298 break; 6299 } 6300 } 6301 6302 // FIXME: don't ignore attributes. 6303 6304 // If it's explicit specializations all the way down, just forget 6305 // about the template header and build an appropriate non-templated 6306 // friend. TODO: for source fidelity, remember the headers. 6307 if (isAllExplicitSpecializations) { 6308 ElaboratedTypeKeyword Keyword 6309 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6310 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6311 TagLoc, SS.getRange(), NameLoc); 6312 if (T.isNull()) 6313 return 0; 6314 6315 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6316 if (isa<DependentNameType>(T)) { 6317 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6318 TL.setKeywordLoc(TagLoc); 6319 TL.setQualifierRange(SS.getRange()); 6320 TL.setNameLoc(NameLoc); 6321 } else { 6322 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6323 TL.setKeywordLoc(TagLoc); 6324 TL.setQualifierRange(SS.getRange()); 6325 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6326 } 6327 6328 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6329 TSI, FriendLoc); 6330 Friend->setAccess(AS_public); 6331 CurContext->addDecl(Friend); 6332 return Friend; 6333 } 6334 6335 // Handle the case of a templated-scope friend class. e.g. 6336 // template <class T> class A<T>::B; 6337 // FIXME: we don't support these right now. 6338 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6339 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6340 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6341 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6342 TL.setKeywordLoc(TagLoc); 6343 TL.setQualifierRange(SS.getRange()); 6344 TL.setNameLoc(NameLoc); 6345 6346 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6347 TSI, FriendLoc); 6348 Friend->setAccess(AS_public); 6349 Friend->setUnsupportedFriend(true); 6350 CurContext->addDecl(Friend); 6351 return Friend; 6352} 6353 6354 6355/// Handle a friend type declaration. This works in tandem with 6356/// ActOnTag. 6357/// 6358/// Notes on friend class templates: 6359/// 6360/// We generally treat friend class declarations as if they were 6361/// declaring a class. So, for example, the elaborated type specifier 6362/// in a friend declaration is required to obey the restrictions of a 6363/// class-head (i.e. no typedefs in the scope chain), template 6364/// parameters are required to match up with simple template-ids, &c. 6365/// However, unlike when declaring a template specialization, it's 6366/// okay to refer to a template specialization without an empty 6367/// template parameter declaration, e.g. 6368/// friend class A<T>::B<unsigned>; 6369/// We permit this as a special case; if there are any template 6370/// parameters present at all, require proper matching, i.e. 6371/// template <> template <class T> friend class A<int>::B; 6372Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6373 MultiTemplateParamsArg TempParams) { 6374 SourceLocation Loc = DS.getSourceRange().getBegin(); 6375 6376 assert(DS.isFriendSpecified()); 6377 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6378 6379 // Try to convert the decl specifier to a type. This works for 6380 // friend templates because ActOnTag never produces a ClassTemplateDecl 6381 // for a TUK_Friend. 6382 Declarator TheDeclarator(DS, Declarator::MemberContext); 6383 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6384 QualType T = TSI->getType(); 6385 if (TheDeclarator.isInvalidType()) 6386 return 0; 6387 6388 // This is definitely an error in C++98. It's probably meant to 6389 // be forbidden in C++0x, too, but the specification is just 6390 // poorly written. 6391 // 6392 // The problem is with declarations like the following: 6393 // template <T> friend A<T>::foo; 6394 // where deciding whether a class C is a friend or not now hinges 6395 // on whether there exists an instantiation of A that causes 6396 // 'foo' to equal C. There are restrictions on class-heads 6397 // (which we declare (by fiat) elaborated friend declarations to 6398 // be) that makes this tractable. 6399 // 6400 // FIXME: handle "template <> friend class A<T>;", which 6401 // is possibly well-formed? Who even knows? 6402 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6403 Diag(Loc, diag::err_tagless_friend_type_template) 6404 << DS.getSourceRange(); 6405 return 0; 6406 } 6407 6408 // C++98 [class.friend]p1: A friend of a class is a function 6409 // or class that is not a member of the class . . . 6410 // This is fixed in DR77, which just barely didn't make the C++03 6411 // deadline. It's also a very silly restriction that seriously 6412 // affects inner classes and which nobody else seems to implement; 6413 // thus we never diagnose it, not even in -pedantic. 6414 // 6415 // But note that we could warn about it: it's always useless to 6416 // friend one of your own members (it's not, however, worthless to 6417 // friend a member of an arbitrary specialization of your template). 6418 6419 Decl *D; 6420 if (unsigned NumTempParamLists = TempParams.size()) 6421 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6422 NumTempParamLists, 6423 TempParams.release(), 6424 TSI, 6425 DS.getFriendSpecLoc()); 6426 else 6427 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6428 6429 if (!D) 6430 return 0; 6431 6432 D->setAccess(AS_public); 6433 CurContext->addDecl(D); 6434 6435 return D; 6436} 6437 6438Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6439 MultiTemplateParamsArg TemplateParams) { 6440 const DeclSpec &DS = D.getDeclSpec(); 6441 6442 assert(DS.isFriendSpecified()); 6443 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6444 6445 SourceLocation Loc = D.getIdentifierLoc(); 6446 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6447 QualType T = TInfo->getType(); 6448 6449 // C++ [class.friend]p1 6450 // A friend of a class is a function or class.... 6451 // Note that this sees through typedefs, which is intended. 6452 // It *doesn't* see through dependent types, which is correct 6453 // according to [temp.arg.type]p3: 6454 // If a declaration acquires a function type through a 6455 // type dependent on a template-parameter and this causes 6456 // a declaration that does not use the syntactic form of a 6457 // function declarator to have a function type, the program 6458 // is ill-formed. 6459 if (!T->isFunctionType()) { 6460 Diag(Loc, diag::err_unexpected_friend); 6461 6462 // It might be worthwhile to try to recover by creating an 6463 // appropriate declaration. 6464 return 0; 6465 } 6466 6467 // C++ [namespace.memdef]p3 6468 // - If a friend declaration in a non-local class first declares a 6469 // class or function, the friend class or function is a member 6470 // of the innermost enclosing namespace. 6471 // - The name of the friend is not found by simple name lookup 6472 // until a matching declaration is provided in that namespace 6473 // scope (either before or after the class declaration granting 6474 // friendship). 6475 // - If a friend function is called, its name may be found by the 6476 // name lookup that considers functions from namespaces and 6477 // classes associated with the types of the function arguments. 6478 // - When looking for a prior declaration of a class or a function 6479 // declared as a friend, scopes outside the innermost enclosing 6480 // namespace scope are not considered. 6481 6482 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6483 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6484 DeclarationName Name = NameInfo.getName(); 6485 assert(Name); 6486 6487 // The context we found the declaration in, or in which we should 6488 // create the declaration. 6489 DeclContext *DC; 6490 Scope *DCScope = S; 6491 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6492 ForRedeclaration); 6493 6494 // FIXME: there are different rules in local classes 6495 6496 // There are four cases here. 6497 // - There's no scope specifier, in which case we just go to the 6498 // appropriate scope and look for a function or function template 6499 // there as appropriate. 6500 // Recover from invalid scope qualifiers as if they just weren't there. 6501 if (SS.isInvalid() || !SS.isSet()) { 6502 // C++0x [namespace.memdef]p3: 6503 // If the name in a friend declaration is neither qualified nor 6504 // a template-id and the declaration is a function or an 6505 // elaborated-type-specifier, the lookup to determine whether 6506 // the entity has been previously declared shall not consider 6507 // any scopes outside the innermost enclosing namespace. 6508 // C++0x [class.friend]p11: 6509 // If a friend declaration appears in a local class and the name 6510 // specified is an unqualified name, a prior declaration is 6511 // looked up without considering scopes that are outside the 6512 // innermost enclosing non-class scope. For a friend function 6513 // declaration, if there is no prior declaration, the program is 6514 // ill-formed. 6515 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6516 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 6517 6518 // Find the appropriate context according to the above. 6519 DC = CurContext; 6520 while (true) { 6521 // Skip class contexts. If someone can cite chapter and verse 6522 // for this behavior, that would be nice --- it's what GCC and 6523 // EDG do, and it seems like a reasonable intent, but the spec 6524 // really only says that checks for unqualified existing 6525 // declarations should stop at the nearest enclosing namespace, 6526 // not that they should only consider the nearest enclosing 6527 // namespace. 6528 while (DC->isRecord()) 6529 DC = DC->getParent(); 6530 6531 LookupQualifiedName(Previous, DC); 6532 6533 // TODO: decide what we think about using declarations. 6534 if (isLocal || !Previous.empty()) 6535 break; 6536 6537 if (isTemplateId) { 6538 if (isa<TranslationUnitDecl>(DC)) break; 6539 } else { 6540 if (DC->isFileContext()) break; 6541 } 6542 DC = DC->getParent(); 6543 } 6544 6545 // C++ [class.friend]p1: A friend of a class is a function or 6546 // class that is not a member of the class . . . 6547 // C++0x changes this for both friend types and functions. 6548 // Most C++ 98 compilers do seem to give an error here, so 6549 // we do, too. 6550 if (!Previous.empty() && DC->Equals(CurContext) 6551 && !getLangOptions().CPlusPlus0x) 6552 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6553 6554 DCScope = getScopeForDeclContext(S, DC); 6555 6556 // - There's a non-dependent scope specifier, in which case we 6557 // compute it and do a previous lookup there for a function 6558 // or function template. 6559 } else if (!SS.getScopeRep()->isDependent()) { 6560 DC = computeDeclContext(SS); 6561 if (!DC) return 0; 6562 6563 if (RequireCompleteDeclContext(SS, DC)) return 0; 6564 6565 LookupQualifiedName(Previous, DC); 6566 6567 // Ignore things found implicitly in the wrong scope. 6568 // TODO: better diagnostics for this case. Suggesting the right 6569 // qualified scope would be nice... 6570 LookupResult::Filter F = Previous.makeFilter(); 6571 while (F.hasNext()) { 6572 NamedDecl *D = F.next(); 6573 if (!DC->InEnclosingNamespaceSetOf( 6574 D->getDeclContext()->getRedeclContext())) 6575 F.erase(); 6576 } 6577 F.done(); 6578 6579 if (Previous.empty()) { 6580 D.setInvalidType(); 6581 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6582 return 0; 6583 } 6584 6585 // C++ [class.friend]p1: A friend of a class is a function or 6586 // class that is not a member of the class . . . 6587 if (DC->Equals(CurContext)) 6588 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6589 6590 // - There's a scope specifier that does not match any template 6591 // parameter lists, in which case we use some arbitrary context, 6592 // create a method or method template, and wait for instantiation. 6593 // - There's a scope specifier that does match some template 6594 // parameter lists, which we don't handle right now. 6595 } else { 6596 DC = CurContext; 6597 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6598 } 6599 6600 if (!DC->isRecord()) { 6601 // This implies that it has to be an operator or function. 6602 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6603 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6604 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6605 Diag(Loc, diag::err_introducing_special_friend) << 6606 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6607 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6608 return 0; 6609 } 6610 } 6611 6612 bool Redeclaration = false; 6613 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6614 move(TemplateParams), 6615 IsDefinition, 6616 Redeclaration); 6617 if (!ND) return 0; 6618 6619 assert(ND->getDeclContext() == DC); 6620 assert(ND->getLexicalDeclContext() == CurContext); 6621 6622 // Add the function declaration to the appropriate lookup tables, 6623 // adjusting the redeclarations list as necessary. We don't 6624 // want to do this yet if the friending class is dependent. 6625 // 6626 // Also update the scope-based lookup if the target context's 6627 // lookup context is in lexical scope. 6628 if (!CurContext->isDependentContext()) { 6629 DC = DC->getRedeclContext(); 6630 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6631 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6632 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6633 } 6634 6635 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6636 D.getIdentifierLoc(), ND, 6637 DS.getFriendSpecLoc()); 6638 FrD->setAccess(AS_public); 6639 CurContext->addDecl(FrD); 6640 6641 if (ND->isInvalidDecl()) 6642 FrD->setInvalidDecl(); 6643 else { 6644 FunctionDecl *FD; 6645 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 6646 FD = FTD->getTemplatedDecl(); 6647 else 6648 FD = cast<FunctionDecl>(ND); 6649 6650 // Mark templated-scope function declarations as unsupported. 6651 if (FD->getNumTemplateParameterLists()) 6652 FrD->setUnsupportedFriend(true); 6653 } 6654 6655 return ND; 6656} 6657 6658void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6659 AdjustDeclIfTemplate(Dcl); 6660 6661 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6662 if (!Fn) { 6663 Diag(DelLoc, diag::err_deleted_non_function); 6664 return; 6665 } 6666 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6667 Diag(DelLoc, diag::err_deleted_decl_not_first); 6668 Diag(Prev->getLocation(), diag::note_previous_declaration); 6669 // If the declaration wasn't the first, we delete the function anyway for 6670 // recovery. 6671 } 6672 Fn->setDeleted(); 6673} 6674 6675static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6676 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6677 ++CI) { 6678 Stmt *SubStmt = *CI; 6679 if (!SubStmt) 6680 continue; 6681 if (isa<ReturnStmt>(SubStmt)) 6682 Self.Diag(SubStmt->getSourceRange().getBegin(), 6683 diag::err_return_in_constructor_handler); 6684 if (!isa<Expr>(SubStmt)) 6685 SearchForReturnInStmt(Self, SubStmt); 6686 } 6687} 6688 6689void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6690 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6691 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6692 SearchForReturnInStmt(*this, Handler); 6693 } 6694} 6695 6696bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6697 const CXXMethodDecl *Old) { 6698 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6699 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6700 6701 if (Context.hasSameType(NewTy, OldTy) || 6702 NewTy->isDependentType() || OldTy->isDependentType()) 6703 return false; 6704 6705 // Check if the return types are covariant 6706 QualType NewClassTy, OldClassTy; 6707 6708 /// Both types must be pointers or references to classes. 6709 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6710 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6711 NewClassTy = NewPT->getPointeeType(); 6712 OldClassTy = OldPT->getPointeeType(); 6713 } 6714 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6715 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6716 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6717 NewClassTy = NewRT->getPointeeType(); 6718 OldClassTy = OldRT->getPointeeType(); 6719 } 6720 } 6721 } 6722 6723 // The return types aren't either both pointers or references to a class type. 6724 if (NewClassTy.isNull()) { 6725 Diag(New->getLocation(), 6726 diag::err_different_return_type_for_overriding_virtual_function) 6727 << New->getDeclName() << NewTy << OldTy; 6728 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6729 6730 return true; 6731 } 6732 6733 // C++ [class.virtual]p6: 6734 // If the return type of D::f differs from the return type of B::f, the 6735 // class type in the return type of D::f shall be complete at the point of 6736 // declaration of D::f or shall be the class type D. 6737 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6738 if (!RT->isBeingDefined() && 6739 RequireCompleteType(New->getLocation(), NewClassTy, 6740 PDiag(diag::err_covariant_return_incomplete) 6741 << New->getDeclName())) 6742 return true; 6743 } 6744 6745 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6746 // Check if the new class derives from the old class. 6747 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6748 Diag(New->getLocation(), 6749 diag::err_covariant_return_not_derived) 6750 << New->getDeclName() << NewTy << OldTy; 6751 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6752 return true; 6753 } 6754 6755 // Check if we the conversion from derived to base is valid. 6756 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6757 diag::err_covariant_return_inaccessible_base, 6758 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6759 // FIXME: Should this point to the return type? 6760 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6761 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6762 return true; 6763 } 6764 } 6765 6766 // The qualifiers of the return types must be the same. 6767 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6768 Diag(New->getLocation(), 6769 diag::err_covariant_return_type_different_qualifications) 6770 << New->getDeclName() << NewTy << OldTy; 6771 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6772 return true; 6773 }; 6774 6775 6776 // The new class type must have the same or less qualifiers as the old type. 6777 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6778 Diag(New->getLocation(), 6779 diag::err_covariant_return_type_class_type_more_qualified) 6780 << New->getDeclName() << NewTy << OldTy; 6781 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6782 return true; 6783 }; 6784 6785 return false; 6786} 6787 6788bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6789 const CXXMethodDecl *Old) 6790{ 6791 if (Old->hasAttr<FinalAttr>()) { 6792 Diag(New->getLocation(), diag::err_final_function_overridden) 6793 << New->getDeclName(); 6794 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6795 return true; 6796 } 6797 6798 return false; 6799} 6800 6801/// \brief Mark the given method pure. 6802/// 6803/// \param Method the method to be marked pure. 6804/// 6805/// \param InitRange the source range that covers the "0" initializer. 6806bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6807 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6808 Method->setPure(); 6809 return false; 6810 } 6811 6812 if (!Method->isInvalidDecl()) 6813 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6814 << Method->getDeclName() << InitRange; 6815 return true; 6816} 6817 6818/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6819/// an initializer for the out-of-line declaration 'Dcl'. The scope 6820/// is a fresh scope pushed for just this purpose. 6821/// 6822/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6823/// static data member of class X, names should be looked up in the scope of 6824/// class X. 6825void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6826 // If there is no declaration, there was an error parsing it. 6827 if (D == 0) return; 6828 6829 // We should only get called for declarations with scope specifiers, like: 6830 // int foo::bar; 6831 assert(D->isOutOfLine()); 6832 EnterDeclaratorContext(S, D->getDeclContext()); 6833} 6834 6835/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6836/// initializer for the out-of-line declaration 'D'. 6837void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6838 // If there is no declaration, there was an error parsing it. 6839 if (D == 0) return; 6840 6841 assert(D->isOutOfLine()); 6842 ExitDeclaratorContext(S); 6843} 6844 6845/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6846/// C++ if/switch/while/for statement. 6847/// e.g: "if (int x = f()) {...}" 6848DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6849 // C++ 6.4p2: 6850 // The declarator shall not specify a function or an array. 6851 // The type-specifier-seq shall not contain typedef and shall not declare a 6852 // new class or enumeration. 6853 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6854 "Parser allowed 'typedef' as storage class of condition decl."); 6855 6856 TagDecl *OwnedTag = 0; 6857 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6858 QualType Ty = TInfo->getType(); 6859 6860 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6861 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6862 // would be created and CXXConditionDeclExpr wants a VarDecl. 6863 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6864 << D.getSourceRange(); 6865 return DeclResult(); 6866 } else if (OwnedTag && OwnedTag->isDefinition()) { 6867 // The type-specifier-seq shall not declare a new class or enumeration. 6868 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6869 } 6870 6871 Decl *Dcl = ActOnDeclarator(S, D); 6872 if (!Dcl) 6873 return DeclResult(); 6874 6875 return Dcl; 6876} 6877 6878void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6879 bool DefinitionRequired) { 6880 // Ignore any vtable uses in unevaluated operands or for classes that do 6881 // not have a vtable. 6882 if (!Class->isDynamicClass() || Class->isDependentContext() || 6883 CurContext->isDependentContext() || 6884 ExprEvalContexts.back().Context == Unevaluated) 6885 return; 6886 6887 // Try to insert this class into the map. 6888 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6889 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6890 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6891 if (!Pos.second) { 6892 // If we already had an entry, check to see if we are promoting this vtable 6893 // to required a definition. If so, we need to reappend to the VTableUses 6894 // list, since we may have already processed the first entry. 6895 if (DefinitionRequired && !Pos.first->second) { 6896 Pos.first->second = true; 6897 } else { 6898 // Otherwise, we can early exit. 6899 return; 6900 } 6901 } 6902 6903 // Local classes need to have their virtual members marked 6904 // immediately. For all other classes, we mark their virtual members 6905 // at the end of the translation unit. 6906 if (Class->isLocalClass()) 6907 MarkVirtualMembersReferenced(Loc, Class); 6908 else 6909 VTableUses.push_back(std::make_pair(Class, Loc)); 6910} 6911 6912bool Sema::DefineUsedVTables() { 6913 // If any dynamic classes have their key function defined within 6914 // this translation unit, then those vtables are considered "used" and must 6915 // be emitted. 6916 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6917 if (const CXXMethodDecl *KeyFunction 6918 = Context.getKeyFunction(DynamicClasses[I])) { 6919 const FunctionDecl *Definition = 0; 6920 if (KeyFunction->hasBody(Definition)) 6921 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6922 } 6923 } 6924 6925 if (VTableUses.empty()) 6926 return false; 6927 6928 // Note: The VTableUses vector could grow as a result of marking 6929 // the members of a class as "used", so we check the size each 6930 // time through the loop and prefer indices (with are stable) to 6931 // iterators (which are not). 6932 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6933 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6934 if (!Class) 6935 continue; 6936 6937 SourceLocation Loc = VTableUses[I].second; 6938 6939 // If this class has a key function, but that key function is 6940 // defined in another translation unit, we don't need to emit the 6941 // vtable even though we're using it. 6942 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6943 if (KeyFunction && !KeyFunction->hasBody()) { 6944 switch (KeyFunction->getTemplateSpecializationKind()) { 6945 case TSK_Undeclared: 6946 case TSK_ExplicitSpecialization: 6947 case TSK_ExplicitInstantiationDeclaration: 6948 // The key function is in another translation unit. 6949 continue; 6950 6951 case TSK_ExplicitInstantiationDefinition: 6952 case TSK_ImplicitInstantiation: 6953 // We will be instantiating the key function. 6954 break; 6955 } 6956 } else if (!KeyFunction) { 6957 // If we have a class with no key function that is the subject 6958 // of an explicit instantiation declaration, suppress the 6959 // vtable; it will live with the explicit instantiation 6960 // definition. 6961 bool IsExplicitInstantiationDeclaration 6962 = Class->getTemplateSpecializationKind() 6963 == TSK_ExplicitInstantiationDeclaration; 6964 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6965 REnd = Class->redecls_end(); 6966 R != REnd; ++R) { 6967 TemplateSpecializationKind TSK 6968 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6969 if (TSK == TSK_ExplicitInstantiationDeclaration) 6970 IsExplicitInstantiationDeclaration = true; 6971 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6972 IsExplicitInstantiationDeclaration = false; 6973 break; 6974 } 6975 } 6976 6977 if (IsExplicitInstantiationDeclaration) 6978 continue; 6979 } 6980 6981 // Mark all of the virtual members of this class as referenced, so 6982 // that we can build a vtable. Then, tell the AST consumer that a 6983 // vtable for this class is required. 6984 MarkVirtualMembersReferenced(Loc, Class); 6985 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6986 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6987 6988 // Optionally warn if we're emitting a weak vtable. 6989 if (Class->getLinkage() == ExternalLinkage && 6990 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6991 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6992 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6993 } 6994 } 6995 VTableUses.clear(); 6996 6997 return true; 6998} 6999 7000void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7001 const CXXRecordDecl *RD) { 7002 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7003 e = RD->method_end(); i != e; ++i) { 7004 CXXMethodDecl *MD = *i; 7005 7006 // C++ [basic.def.odr]p2: 7007 // [...] A virtual member function is used if it is not pure. [...] 7008 if (MD->isVirtual() && !MD->isPure()) 7009 MarkDeclarationReferenced(Loc, MD); 7010 } 7011 7012 // Only classes that have virtual bases need a VTT. 7013 if (RD->getNumVBases() == 0) 7014 return; 7015 7016 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7017 e = RD->bases_end(); i != e; ++i) { 7018 const CXXRecordDecl *Base = 7019 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7020 if (Base->getNumVBases() == 0) 7021 continue; 7022 MarkVirtualMembersReferenced(Loc, Base); 7023 } 7024} 7025 7026/// SetIvarInitializers - This routine builds initialization ASTs for the 7027/// Objective-C implementation whose ivars need be initialized. 7028void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7029 if (!getLangOptions().CPlusPlus) 7030 return; 7031 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7032 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7033 CollectIvarsToConstructOrDestruct(OID, ivars); 7034 if (ivars.empty()) 7035 return; 7036 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 7037 for (unsigned i = 0; i < ivars.size(); i++) { 7038 FieldDecl *Field = ivars[i]; 7039 if (Field->isInvalidDecl()) 7040 continue; 7041 7042 CXXBaseOrMemberInitializer *Member; 7043 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7044 InitializationKind InitKind = 7045 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7046 7047 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7048 ExprResult MemberInit = 7049 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7050 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 7051 // Note, MemberInit could actually come back empty if no initialization 7052 // is required (e.g., because it would call a trivial default constructor) 7053 if (!MemberInit.get() || MemberInit.isInvalid()) 7054 continue; 7055 7056 Member = 7057 new (Context) CXXBaseOrMemberInitializer(Context, 7058 Field, SourceLocation(), 7059 SourceLocation(), 7060 MemberInit.takeAs<Expr>(), 7061 SourceLocation()); 7062 AllToInit.push_back(Member); 7063 7064 // Be sure that the destructor is accessible and is marked as referenced. 7065 if (const RecordType *RecordTy 7066 = Context.getBaseElementType(Field->getType()) 7067 ->getAs<RecordType>()) { 7068 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7069 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7070 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7071 CheckDestructorAccess(Field->getLocation(), Destructor, 7072 PDiag(diag::err_access_dtor_ivar) 7073 << Context.getBaseElementType(Field->getType())); 7074 } 7075 } 7076 } 7077 ObjCImplementation->setIvarInitializers(Context, 7078 AllToInit.data(), AllToInit.size()); 7079 } 7080} 7081