SemaDeclCXX.cpp revision 922fff2c9ef458fc04839e45a79552513f41ec7e
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->isBlockVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check that the default argument is well-formed 181 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 182 if (DefaultArgChecker.Visit(DefaultArg)) { 183 Param->setInvalidDecl(); 184 return; 185 } 186 187 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 188} 189 190/// ActOnParamUnparsedDefaultArgument - We've seen a default 191/// argument for a function parameter, but we can't parse it yet 192/// because we're inside a class definition. Note that this default 193/// argument will be parsed later. 194void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 195 SourceLocation EqualLoc, 196 SourceLocation ArgLoc) { 197 if (!param) 198 return; 199 200 ParmVarDecl *Param = cast<ParmVarDecl>(param); 201 if (Param) 202 Param->setUnparsedDefaultArg(); 203 204 UnparsedDefaultArgLocs[Param] = ArgLoc; 205} 206 207/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 208/// the default argument for the parameter param failed. 209void Sema::ActOnParamDefaultArgumentError(Decl *param) { 210 if (!param) 211 return; 212 213 ParmVarDecl *Param = cast<ParmVarDecl>(param); 214 215 Param->setInvalidDecl(); 216 217 UnparsedDefaultArgLocs.erase(Param); 218} 219 220/// CheckExtraCXXDefaultArguments - Check for any extra default 221/// arguments in the declarator, which is not a function declaration 222/// or definition and therefore is not permitted to have default 223/// arguments. This routine should be invoked for every declarator 224/// that is not a function declaration or definition. 225void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 226 // C++ [dcl.fct.default]p3 227 // A default argument expression shall be specified only in the 228 // parameter-declaration-clause of a function declaration or in a 229 // template-parameter (14.1). It shall not be specified for a 230 // parameter pack. If it is specified in a 231 // parameter-declaration-clause, it shall not occur within a 232 // declarator or abstract-declarator of a parameter-declaration. 233 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 234 DeclaratorChunk &chunk = D.getTypeObject(i); 235 if (chunk.Kind == DeclaratorChunk::Function) { 236 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 237 ParmVarDecl *Param = 238 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 239 if (Param->hasUnparsedDefaultArg()) { 240 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 241 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 242 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 243 delete Toks; 244 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 245 } else if (Param->getDefaultArg()) { 246 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 247 << Param->getDefaultArg()->getSourceRange(); 248 Param->setDefaultArg(0); 249 } 250 } 251 } 252 } 253} 254 255// MergeCXXFunctionDecl - Merge two declarations of the same C++ 256// function, once we already know that they have the same 257// type. Subroutine of MergeFunctionDecl. Returns true if there was an 258// error, false otherwise. 259bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 260 bool Invalid = false; 261 262 // C++ [dcl.fct.default]p4: 263 // For non-template functions, default arguments can be added in 264 // later declarations of a function in the same 265 // scope. Declarations in different scopes have completely 266 // distinct sets of default arguments. That is, declarations in 267 // inner scopes do not acquire default arguments from 268 // declarations in outer scopes, and vice versa. In a given 269 // function declaration, all parameters subsequent to a 270 // parameter with a default argument shall have default 271 // arguments supplied in this or previous declarations. A 272 // default argument shall not be redefined by a later 273 // declaration (not even to the same value). 274 // 275 // C++ [dcl.fct.default]p6: 276 // Except for member functions of class templates, the default arguments 277 // in a member function definition that appears outside of the class 278 // definition are added to the set of default arguments provided by the 279 // member function declaration in the class definition. 280 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 281 ParmVarDecl *OldParam = Old->getParamDecl(p); 282 ParmVarDecl *NewParam = New->getParamDecl(p); 283 284 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 285 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 286 // hint here. Alternatively, we could walk the type-source information 287 // for NewParam to find the last source location in the type... but it 288 // isn't worth the effort right now. This is the kind of test case that 289 // is hard to get right: 290 291 // int f(int); 292 // void g(int (*fp)(int) = f); 293 // void g(int (*fp)(int) = &f); 294 Diag(NewParam->getLocation(), 295 diag::err_param_default_argument_redefinition) 296 << NewParam->getDefaultArgRange(); 297 298 // Look for the function declaration where the default argument was 299 // actually written, which may be a declaration prior to Old. 300 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 301 Older; Older = Older->getPreviousDeclaration()) { 302 if (!Older->getParamDecl(p)->hasDefaultArg()) 303 break; 304 305 OldParam = Older->getParamDecl(p); 306 } 307 308 Diag(OldParam->getLocation(), diag::note_previous_definition) 309 << OldParam->getDefaultArgRange(); 310 Invalid = true; 311 } else if (OldParam->hasDefaultArg()) { 312 // Merge the old default argument into the new parameter. 313 // It's important to use getInit() here; getDefaultArg() 314 // strips off any top-level CXXExprWithTemporaries. 315 NewParam->setHasInheritedDefaultArg(); 316 if (OldParam->hasUninstantiatedDefaultArg()) 317 NewParam->setUninstantiatedDefaultArg( 318 OldParam->getUninstantiatedDefaultArg()); 319 else 320 NewParam->setDefaultArg(OldParam->getInit()); 321 } else if (NewParam->hasDefaultArg()) { 322 if (New->getDescribedFunctionTemplate()) { 323 // Paragraph 4, quoted above, only applies to non-template functions. 324 Diag(NewParam->getLocation(), 325 diag::err_param_default_argument_template_redecl) 326 << NewParam->getDefaultArgRange(); 327 Diag(Old->getLocation(), diag::note_template_prev_declaration) 328 << false; 329 } else if (New->getTemplateSpecializationKind() 330 != TSK_ImplicitInstantiation && 331 New->getTemplateSpecializationKind() != TSK_Undeclared) { 332 // C++ [temp.expr.spec]p21: 333 // Default function arguments shall not be specified in a declaration 334 // or a definition for one of the following explicit specializations: 335 // - the explicit specialization of a function template; 336 // - the explicit specialization of a member function template; 337 // - the explicit specialization of a member function of a class 338 // template where the class template specialization to which the 339 // member function specialization belongs is implicitly 340 // instantiated. 341 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 342 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 343 << New->getDeclName() 344 << NewParam->getDefaultArgRange(); 345 } else if (New->getDeclContext()->isDependentContext()) { 346 // C++ [dcl.fct.default]p6 (DR217): 347 // Default arguments for a member function of a class template shall 348 // be specified on the initial declaration of the member function 349 // within the class template. 350 // 351 // Reading the tea leaves a bit in DR217 and its reference to DR205 352 // leads me to the conclusion that one cannot add default function 353 // arguments for an out-of-line definition of a member function of a 354 // dependent type. 355 int WhichKind = 2; 356 if (CXXRecordDecl *Record 357 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 358 if (Record->getDescribedClassTemplate()) 359 WhichKind = 0; 360 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 361 WhichKind = 1; 362 else 363 WhichKind = 2; 364 } 365 366 Diag(NewParam->getLocation(), 367 diag::err_param_default_argument_member_template_redecl) 368 << WhichKind 369 << NewParam->getDefaultArgRange(); 370 } 371 } 372 } 373 374 if (CheckEquivalentExceptionSpec(Old, New)) 375 Invalid = true; 376 377 return Invalid; 378} 379 380/// CheckCXXDefaultArguments - Verify that the default arguments for a 381/// function declaration are well-formed according to C++ 382/// [dcl.fct.default]. 383void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 384 unsigned NumParams = FD->getNumParams(); 385 unsigned p; 386 387 // Find first parameter with a default argument 388 for (p = 0; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (Param->hasDefaultArg()) 391 break; 392 } 393 394 // C++ [dcl.fct.default]p4: 395 // In a given function declaration, all parameters 396 // subsequent to a parameter with a default argument shall 397 // have default arguments supplied in this or previous 398 // declarations. A default argument shall not be redefined 399 // by a later declaration (not even to the same value). 400 unsigned LastMissingDefaultArg = 0; 401 for (; p < NumParams; ++p) { 402 ParmVarDecl *Param = FD->getParamDecl(p); 403 if (!Param->hasDefaultArg()) { 404 if (Param->isInvalidDecl()) 405 /* We already complained about this parameter. */; 406 else if (Param->getIdentifier()) 407 Diag(Param->getLocation(), 408 diag::err_param_default_argument_missing_name) 409 << Param->getIdentifier(); 410 else 411 Diag(Param->getLocation(), 412 diag::err_param_default_argument_missing); 413 414 LastMissingDefaultArg = p; 415 } 416 } 417 418 if (LastMissingDefaultArg > 0) { 419 // Some default arguments were missing. Clear out all of the 420 // default arguments up to (and including) the last missing 421 // default argument, so that we leave the function parameters 422 // in a semantically valid state. 423 for (p = 0; p <= LastMissingDefaultArg; ++p) { 424 ParmVarDecl *Param = FD->getParamDecl(p); 425 if (Param->hasDefaultArg()) { 426 Param->setDefaultArg(0); 427 } 428 } 429 } 430} 431 432/// isCurrentClassName - Determine whether the identifier II is the 433/// name of the class type currently being defined. In the case of 434/// nested classes, this will only return true if II is the name of 435/// the innermost class. 436bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 437 const CXXScopeSpec *SS) { 438 assert(getLangOptions().CPlusPlus && "No class names in C!"); 439 440 CXXRecordDecl *CurDecl; 441 if (SS && SS->isSet() && !SS->isInvalid()) { 442 DeclContext *DC = computeDeclContext(*SS, true); 443 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 444 } else 445 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 446 447 if (CurDecl && CurDecl->getIdentifier()) 448 return &II == CurDecl->getIdentifier(); 449 else 450 return false; 451} 452 453/// \brief Check the validity of a C++ base class specifier. 454/// 455/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 456/// and returns NULL otherwise. 457CXXBaseSpecifier * 458Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 459 SourceRange SpecifierRange, 460 bool Virtual, AccessSpecifier Access, 461 TypeSourceInfo *TInfo) { 462 QualType BaseType = TInfo->getType(); 463 464 // C++ [class.union]p1: 465 // A union shall not have base classes. 466 if (Class->isUnion()) { 467 Diag(Class->getLocation(), diag::err_base_clause_on_union) 468 << SpecifierRange; 469 return 0; 470 } 471 472 if (BaseType->isDependentType()) 473 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 474 Class->getTagKind() == TTK_Class, 475 Access, TInfo); 476 477 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 478 479 // Base specifiers must be record types. 480 if (!BaseType->isRecordType()) { 481 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 482 return 0; 483 } 484 485 // C++ [class.union]p1: 486 // A union shall not be used as a base class. 487 if (BaseType->isUnionType()) { 488 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 489 return 0; 490 } 491 492 // C++ [class.derived]p2: 493 // The class-name in a base-specifier shall not be an incompletely 494 // defined class. 495 if (RequireCompleteType(BaseLoc, BaseType, 496 PDiag(diag::err_incomplete_base_class) 497 << SpecifierRange)) { 498 Class->setInvalidDecl(); 499 return 0; 500 } 501 502 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 503 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 504 assert(BaseDecl && "Record type has no declaration"); 505 BaseDecl = BaseDecl->getDefinition(); 506 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 507 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 508 assert(CXXBaseDecl && "Base type is not a C++ type"); 509 510 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 511 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 512 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 513 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 514 << BaseType; 515 return 0; 516 } 517 518 if (BaseDecl->isInvalidDecl()) 519 Class->setInvalidDecl(); 520 521 // Create the base specifier. 522 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 523 Class->getTagKind() == TTK_Class, 524 Access, TInfo); 525} 526 527/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 528/// one entry in the base class list of a class specifier, for 529/// example: 530/// class foo : public bar, virtual private baz { 531/// 'public bar' and 'virtual private baz' are each base-specifiers. 532BaseResult 533Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 534 bool Virtual, AccessSpecifier Access, 535 ParsedType basetype, SourceLocation BaseLoc) { 536 if (!classdecl) 537 return true; 538 539 AdjustDeclIfTemplate(classdecl); 540 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 541 if (!Class) 542 return true; 543 544 TypeSourceInfo *TInfo = 0; 545 GetTypeFromParser(basetype, &TInfo); 546 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 547 Virtual, Access, TInfo)) 548 return BaseSpec; 549 550 return true; 551} 552 553/// \brief Performs the actual work of attaching the given base class 554/// specifiers to a C++ class. 555bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 556 unsigned NumBases) { 557 if (NumBases == 0) 558 return false; 559 560 // Used to keep track of which base types we have already seen, so 561 // that we can properly diagnose redundant direct base types. Note 562 // that the key is always the unqualified canonical type of the base 563 // class. 564 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 565 566 // Copy non-redundant base specifiers into permanent storage. 567 unsigned NumGoodBases = 0; 568 bool Invalid = false; 569 for (unsigned idx = 0; idx < NumBases; ++idx) { 570 QualType NewBaseType 571 = Context.getCanonicalType(Bases[idx]->getType()); 572 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 573 if (!Class->hasObjectMember()) { 574 if (const RecordType *FDTTy = 575 NewBaseType.getTypePtr()->getAs<RecordType>()) 576 if (FDTTy->getDecl()->hasObjectMember()) 577 Class->setHasObjectMember(true); 578 } 579 580 if (KnownBaseTypes[NewBaseType]) { 581 // C++ [class.mi]p3: 582 // A class shall not be specified as a direct base class of a 583 // derived class more than once. 584 Diag(Bases[idx]->getSourceRange().getBegin(), 585 diag::err_duplicate_base_class) 586 << KnownBaseTypes[NewBaseType]->getType() 587 << Bases[idx]->getSourceRange(); 588 589 // Delete the duplicate base class specifier; we're going to 590 // overwrite its pointer later. 591 Context.Deallocate(Bases[idx]); 592 593 Invalid = true; 594 } else { 595 // Okay, add this new base class. 596 KnownBaseTypes[NewBaseType] = Bases[idx]; 597 Bases[NumGoodBases++] = Bases[idx]; 598 } 599 } 600 601 // Attach the remaining base class specifiers to the derived class. 602 Class->setBases(Bases, NumGoodBases); 603 604 // Delete the remaining (good) base class specifiers, since their 605 // data has been copied into the CXXRecordDecl. 606 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 607 Context.Deallocate(Bases[idx]); 608 609 return Invalid; 610} 611 612/// ActOnBaseSpecifiers - Attach the given base specifiers to the 613/// class, after checking whether there are any duplicate base 614/// classes. 615void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 616 unsigned NumBases) { 617 if (!ClassDecl || !Bases || !NumBases) 618 return; 619 620 AdjustDeclIfTemplate(ClassDecl); 621 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 622 (CXXBaseSpecifier**)(Bases), NumBases); 623} 624 625static CXXRecordDecl *GetClassForType(QualType T) { 626 if (const RecordType *RT = T->getAs<RecordType>()) 627 return cast<CXXRecordDecl>(RT->getDecl()); 628 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 629 return ICT->getDecl(); 630 else 631 return 0; 632} 633 634/// \brief Determine whether the type \p Derived is a C++ class that is 635/// derived from the type \p Base. 636bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 637 if (!getLangOptions().CPlusPlus) 638 return false; 639 640 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 641 if (!DerivedRD) 642 return false; 643 644 CXXRecordDecl *BaseRD = GetClassForType(Base); 645 if (!BaseRD) 646 return false; 647 648 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 649 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 650} 651 652/// \brief Determine whether the type \p Derived is a C++ class that is 653/// derived from the type \p Base. 654bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 655 if (!getLangOptions().CPlusPlus) 656 return false; 657 658 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 659 if (!DerivedRD) 660 return false; 661 662 CXXRecordDecl *BaseRD = GetClassForType(Base); 663 if (!BaseRD) 664 return false; 665 666 return DerivedRD->isDerivedFrom(BaseRD, Paths); 667} 668 669void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 670 CXXCastPath &BasePathArray) { 671 assert(BasePathArray.empty() && "Base path array must be empty!"); 672 assert(Paths.isRecordingPaths() && "Must record paths!"); 673 674 const CXXBasePath &Path = Paths.front(); 675 676 // We first go backward and check if we have a virtual base. 677 // FIXME: It would be better if CXXBasePath had the base specifier for 678 // the nearest virtual base. 679 unsigned Start = 0; 680 for (unsigned I = Path.size(); I != 0; --I) { 681 if (Path[I - 1].Base->isVirtual()) { 682 Start = I - 1; 683 break; 684 } 685 } 686 687 // Now add all bases. 688 for (unsigned I = Start, E = Path.size(); I != E; ++I) 689 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 690} 691 692/// \brief Determine whether the given base path includes a virtual 693/// base class. 694bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 695 for (CXXCastPath::const_iterator B = BasePath.begin(), 696 BEnd = BasePath.end(); 697 B != BEnd; ++B) 698 if ((*B)->isVirtual()) 699 return true; 700 701 return false; 702} 703 704/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 705/// conversion (where Derived and Base are class types) is 706/// well-formed, meaning that the conversion is unambiguous (and 707/// that all of the base classes are accessible). Returns true 708/// and emits a diagnostic if the code is ill-formed, returns false 709/// otherwise. Loc is the location where this routine should point to 710/// if there is an error, and Range is the source range to highlight 711/// if there is an error. 712bool 713Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 714 unsigned InaccessibleBaseID, 715 unsigned AmbigiousBaseConvID, 716 SourceLocation Loc, SourceRange Range, 717 DeclarationName Name, 718 CXXCastPath *BasePath) { 719 // First, determine whether the path from Derived to Base is 720 // ambiguous. This is slightly more expensive than checking whether 721 // the Derived to Base conversion exists, because here we need to 722 // explore multiple paths to determine if there is an ambiguity. 723 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 724 /*DetectVirtual=*/false); 725 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 726 assert(DerivationOkay && 727 "Can only be used with a derived-to-base conversion"); 728 (void)DerivationOkay; 729 730 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 731 if (InaccessibleBaseID) { 732 // Check that the base class can be accessed. 733 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 734 InaccessibleBaseID)) { 735 case AR_inaccessible: 736 return true; 737 case AR_accessible: 738 case AR_dependent: 739 case AR_delayed: 740 break; 741 } 742 } 743 744 // Build a base path if necessary. 745 if (BasePath) 746 BuildBasePathArray(Paths, *BasePath); 747 return false; 748 } 749 750 // We know that the derived-to-base conversion is ambiguous, and 751 // we're going to produce a diagnostic. Perform the derived-to-base 752 // search just one more time to compute all of the possible paths so 753 // that we can print them out. This is more expensive than any of 754 // the previous derived-to-base checks we've done, but at this point 755 // performance isn't as much of an issue. 756 Paths.clear(); 757 Paths.setRecordingPaths(true); 758 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 759 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 760 (void)StillOkay; 761 762 // Build up a textual representation of the ambiguous paths, e.g., 763 // D -> B -> A, that will be used to illustrate the ambiguous 764 // conversions in the diagnostic. We only print one of the paths 765 // to each base class subobject. 766 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 767 768 Diag(Loc, AmbigiousBaseConvID) 769 << Derived << Base << PathDisplayStr << Range << Name; 770 return true; 771} 772 773bool 774Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 775 SourceLocation Loc, SourceRange Range, 776 CXXCastPath *BasePath, 777 bool IgnoreAccess) { 778 return CheckDerivedToBaseConversion(Derived, Base, 779 IgnoreAccess ? 0 780 : diag::err_upcast_to_inaccessible_base, 781 diag::err_ambiguous_derived_to_base_conv, 782 Loc, Range, DeclarationName(), 783 BasePath); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 823Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 824 SourceLocation ASLoc, 825 SourceLocation ColonLoc) { 826 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 827 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 828 ASLoc, ColonLoc); 829 CurContext->addHiddenDecl(ASDecl); 830 return ASDecl; 831} 832 833/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 834/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 835/// bitfield width if there is one and 'InitExpr' specifies the initializer if 836/// any. 837Decl * 838Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 839 MultiTemplateParamsArg TemplateParameterLists, 840 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 841 bool Deleted) { 842 const DeclSpec &DS = D.getDeclSpec(); 843 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 844 DeclarationName Name = NameInfo.getName(); 845 SourceLocation Loc = NameInfo.getLoc(); 846 Expr *BitWidth = static_cast<Expr*>(BW); 847 Expr *Init = static_cast<Expr*>(InitExpr); 848 849 assert(isa<CXXRecordDecl>(CurContext)); 850 assert(!DS.isFriendSpecified()); 851 852 bool isFunc = false; 853 if (D.isFunctionDeclarator()) 854 isFunc = true; 855 else if (D.getNumTypeObjects() == 0 && 856 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 857 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 858 isFunc = TDType->isFunctionType(); 859 } 860 861 // C++ 9.2p6: A member shall not be declared to have automatic storage 862 // duration (auto, register) or with the extern storage-class-specifier. 863 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 864 // data members and cannot be applied to names declared const or static, 865 // and cannot be applied to reference members. 866 switch (DS.getStorageClassSpec()) { 867 case DeclSpec::SCS_unspecified: 868 case DeclSpec::SCS_typedef: 869 case DeclSpec::SCS_static: 870 // FALL THROUGH. 871 break; 872 case DeclSpec::SCS_mutable: 873 if (isFunc) { 874 if (DS.getStorageClassSpecLoc().isValid()) 875 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 876 else 877 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 878 879 // FIXME: It would be nicer if the keyword was ignored only for this 880 // declarator. Otherwise we could get follow-up errors. 881 D.getMutableDeclSpec().ClearStorageClassSpecs(); 882 } 883 break; 884 default: 885 if (DS.getStorageClassSpecLoc().isValid()) 886 Diag(DS.getStorageClassSpecLoc(), 887 diag::err_storageclass_invalid_for_member); 888 else 889 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 890 D.getMutableDeclSpec().ClearStorageClassSpecs(); 891 } 892 893 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 894 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 895 !isFunc); 896 897 Decl *Member; 898 if (isInstField) { 899 CXXScopeSpec &SS = D.getCXXScopeSpec(); 900 901 902 if (SS.isSet() && !SS.isInvalid()) { 903 // The user provided a superfluous scope specifier inside a class 904 // definition: 905 // 906 // class X { 907 // int X::member; 908 // }; 909 DeclContext *DC = 0; 910 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 911 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 912 << Name << FixItHint::CreateRemoval(SS.getRange()); 913 else 914 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 915 << Name << SS.getRange(); 916 917 SS.clear(); 918 } 919 920 // FIXME: Check for template parameters! 921 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 922 AS); 923 assert(Member && "HandleField never returns null"); 924 } else { 925 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 926 if (!Member) { 927 return 0; 928 } 929 930 // Non-instance-fields can't have a bitfield. 931 if (BitWidth) { 932 if (Member->isInvalidDecl()) { 933 // don't emit another diagnostic. 934 } else if (isa<VarDecl>(Member)) { 935 // C++ 9.6p3: A bit-field shall not be a static member. 936 // "static member 'A' cannot be a bit-field" 937 Diag(Loc, diag::err_static_not_bitfield) 938 << Name << BitWidth->getSourceRange(); 939 } else if (isa<TypedefDecl>(Member)) { 940 // "typedef member 'x' cannot be a bit-field" 941 Diag(Loc, diag::err_typedef_not_bitfield) 942 << Name << BitWidth->getSourceRange(); 943 } else { 944 // A function typedef ("typedef int f(); f a;"). 945 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 946 Diag(Loc, diag::err_not_integral_type_bitfield) 947 << Name << cast<ValueDecl>(Member)->getType() 948 << BitWidth->getSourceRange(); 949 } 950 951 BitWidth = 0; 952 Member->setInvalidDecl(); 953 } 954 955 Member->setAccess(AS); 956 957 // If we have declared a member function template, set the access of the 958 // templated declaration as well. 959 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 960 FunTmpl->getTemplatedDecl()->setAccess(AS); 961 } 962 963 assert((Name || isInstField) && "No identifier for non-field ?"); 964 965 if (Init) 966 AddInitializerToDecl(Member, Init, false); 967 if (Deleted) // FIXME: Source location is not very good. 968 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 969 970 if (isInstField) { 971 FieldCollector->Add(cast<FieldDecl>(Member)); 972 return 0; 973 } 974 return Member; 975} 976 977/// \brief Find the direct and/or virtual base specifiers that 978/// correspond to the given base type, for use in base initialization 979/// within a constructor. 980static bool FindBaseInitializer(Sema &SemaRef, 981 CXXRecordDecl *ClassDecl, 982 QualType BaseType, 983 const CXXBaseSpecifier *&DirectBaseSpec, 984 const CXXBaseSpecifier *&VirtualBaseSpec) { 985 // First, check for a direct base class. 986 DirectBaseSpec = 0; 987 for (CXXRecordDecl::base_class_const_iterator Base 988 = ClassDecl->bases_begin(); 989 Base != ClassDecl->bases_end(); ++Base) { 990 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 991 // We found a direct base of this type. That's what we're 992 // initializing. 993 DirectBaseSpec = &*Base; 994 break; 995 } 996 } 997 998 // Check for a virtual base class. 999 // FIXME: We might be able to short-circuit this if we know in advance that 1000 // there are no virtual bases. 1001 VirtualBaseSpec = 0; 1002 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1003 // We haven't found a base yet; search the class hierarchy for a 1004 // virtual base class. 1005 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1006 /*DetectVirtual=*/false); 1007 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1008 BaseType, Paths)) { 1009 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1010 Path != Paths.end(); ++Path) { 1011 if (Path->back().Base->isVirtual()) { 1012 VirtualBaseSpec = Path->back().Base; 1013 break; 1014 } 1015 } 1016 } 1017 } 1018 1019 return DirectBaseSpec || VirtualBaseSpec; 1020} 1021 1022/// ActOnMemInitializer - Handle a C++ member initializer. 1023MemInitResult 1024Sema::ActOnMemInitializer(Decl *ConstructorD, 1025 Scope *S, 1026 CXXScopeSpec &SS, 1027 IdentifierInfo *MemberOrBase, 1028 ParsedType TemplateTypeTy, 1029 SourceLocation IdLoc, 1030 SourceLocation LParenLoc, 1031 ExprTy **Args, unsigned NumArgs, 1032 SourceLocation RParenLoc) { 1033 if (!ConstructorD) 1034 return true; 1035 1036 AdjustDeclIfTemplate(ConstructorD); 1037 1038 CXXConstructorDecl *Constructor 1039 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1040 if (!Constructor) { 1041 // The user wrote a constructor initializer on a function that is 1042 // not a C++ constructor. Ignore the error for now, because we may 1043 // have more member initializers coming; we'll diagnose it just 1044 // once in ActOnMemInitializers. 1045 return true; 1046 } 1047 1048 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1049 1050 // C++ [class.base.init]p2: 1051 // Names in a mem-initializer-id are looked up in the scope of the 1052 // constructor’s class and, if not found in that scope, are looked 1053 // up in the scope containing the constructor’s 1054 // definition. [Note: if the constructor’s class contains a member 1055 // with the same name as a direct or virtual base class of the 1056 // class, a mem-initializer-id naming the member or base class and 1057 // composed of a single identifier refers to the class member. A 1058 // mem-initializer-id for the hidden base class may be specified 1059 // using a qualified name. ] 1060 if (!SS.getScopeRep() && !TemplateTypeTy) { 1061 // Look for a member, first. 1062 FieldDecl *Member = 0; 1063 DeclContext::lookup_result Result 1064 = ClassDecl->lookup(MemberOrBase); 1065 if (Result.first != Result.second) 1066 Member = dyn_cast<FieldDecl>(*Result.first); 1067 1068 // FIXME: Handle members of an anonymous union. 1069 1070 if (Member) 1071 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1072 LParenLoc, RParenLoc); 1073 } 1074 // It didn't name a member, so see if it names a class. 1075 QualType BaseType; 1076 TypeSourceInfo *TInfo = 0; 1077 1078 if (TemplateTypeTy) { 1079 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1080 } else { 1081 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1082 LookupParsedName(R, S, &SS); 1083 1084 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1085 if (!TyD) { 1086 if (R.isAmbiguous()) return true; 1087 1088 // We don't want access-control diagnostics here. 1089 R.suppressDiagnostics(); 1090 1091 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1092 bool NotUnknownSpecialization = false; 1093 DeclContext *DC = computeDeclContext(SS, false); 1094 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1095 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1096 1097 if (!NotUnknownSpecialization) { 1098 // When the scope specifier can refer to a member of an unknown 1099 // specialization, we take it as a type name. 1100 BaseType = CheckTypenameType(ETK_None, 1101 (NestedNameSpecifier *)SS.getScopeRep(), 1102 *MemberOrBase, SourceLocation(), 1103 SS.getRange(), IdLoc); 1104 if (BaseType.isNull()) 1105 return true; 1106 1107 R.clear(); 1108 R.setLookupName(MemberOrBase); 1109 } 1110 } 1111 1112 // If no results were found, try to correct typos. 1113 if (R.empty() && BaseType.isNull() && 1114 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1115 R.isSingleResult()) { 1116 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1117 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1118 // We have found a non-static data member with a similar 1119 // name to what was typed; complain and initialize that 1120 // member. 1121 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1122 << MemberOrBase << true << R.getLookupName() 1123 << FixItHint::CreateReplacement(R.getNameLoc(), 1124 R.getLookupName().getAsString()); 1125 Diag(Member->getLocation(), diag::note_previous_decl) 1126 << Member->getDeclName(); 1127 1128 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1129 LParenLoc, RParenLoc); 1130 } 1131 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1132 const CXXBaseSpecifier *DirectBaseSpec; 1133 const CXXBaseSpecifier *VirtualBaseSpec; 1134 if (FindBaseInitializer(*this, ClassDecl, 1135 Context.getTypeDeclType(Type), 1136 DirectBaseSpec, VirtualBaseSpec)) { 1137 // We have found a direct or virtual base class with a 1138 // similar name to what was typed; complain and initialize 1139 // that base class. 1140 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1141 << MemberOrBase << false << R.getLookupName() 1142 << FixItHint::CreateReplacement(R.getNameLoc(), 1143 R.getLookupName().getAsString()); 1144 1145 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1146 : VirtualBaseSpec; 1147 Diag(BaseSpec->getSourceRange().getBegin(), 1148 diag::note_base_class_specified_here) 1149 << BaseSpec->getType() 1150 << BaseSpec->getSourceRange(); 1151 1152 TyD = Type; 1153 } 1154 } 1155 } 1156 1157 if (!TyD && BaseType.isNull()) { 1158 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1159 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1160 return true; 1161 } 1162 } 1163 1164 if (BaseType.isNull()) { 1165 BaseType = Context.getTypeDeclType(TyD); 1166 if (SS.isSet()) { 1167 NestedNameSpecifier *Qualifier = 1168 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1169 1170 // FIXME: preserve source range information 1171 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1172 } 1173 } 1174 } 1175 1176 if (!TInfo) 1177 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1178 1179 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1180 LParenLoc, RParenLoc, ClassDecl); 1181} 1182 1183/// Checks an initializer expression for use of uninitialized fields, such as 1184/// containing the field that is being initialized. Returns true if there is an 1185/// uninitialized field was used an updates the SourceLocation parameter; false 1186/// otherwise. 1187static bool InitExprContainsUninitializedFields(const Stmt *S, 1188 const FieldDecl *LhsField, 1189 SourceLocation *L) { 1190 if (isa<CallExpr>(S)) { 1191 // Do not descend into function calls or constructors, as the use 1192 // of an uninitialized field may be valid. One would have to inspect 1193 // the contents of the function/ctor to determine if it is safe or not. 1194 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1195 // may be safe, depending on what the function/ctor does. 1196 return false; 1197 } 1198 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1199 const NamedDecl *RhsField = ME->getMemberDecl(); 1200 1201 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1202 // The member expression points to a static data member. 1203 assert(VD->isStaticDataMember() && 1204 "Member points to non-static data member!"); 1205 (void)VD; 1206 return false; 1207 } 1208 1209 if (isa<EnumConstantDecl>(RhsField)) { 1210 // The member expression points to an enum. 1211 return false; 1212 } 1213 1214 if (RhsField == LhsField) { 1215 // Initializing a field with itself. Throw a warning. 1216 // But wait; there are exceptions! 1217 // Exception #1: The field may not belong to this record. 1218 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1219 const Expr *base = ME->getBase(); 1220 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1221 // Even though the field matches, it does not belong to this record. 1222 return false; 1223 } 1224 // None of the exceptions triggered; return true to indicate an 1225 // uninitialized field was used. 1226 *L = ME->getMemberLoc(); 1227 return true; 1228 } 1229 } else if (isa<SizeOfAlignOfExpr>(S)) { 1230 // sizeof/alignof doesn't reference contents, do not warn. 1231 return false; 1232 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1233 // address-of doesn't reference contents (the pointer may be dereferenced 1234 // in the same expression but it would be rare; and weird). 1235 if (UOE->getOpcode() == UO_AddrOf) 1236 return false; 1237 } 1238 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1239 it != e; ++it) { 1240 if (!*it) { 1241 // An expression such as 'member(arg ?: "")' may trigger this. 1242 continue; 1243 } 1244 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1245 return true; 1246 } 1247 return false; 1248} 1249 1250MemInitResult 1251Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1252 unsigned NumArgs, SourceLocation IdLoc, 1253 SourceLocation LParenLoc, 1254 SourceLocation RParenLoc) { 1255 // Diagnose value-uses of fields to initialize themselves, e.g. 1256 // foo(foo) 1257 // where foo is not also a parameter to the constructor. 1258 // TODO: implement -Wuninitialized and fold this into that framework. 1259 for (unsigned i = 0; i < NumArgs; ++i) { 1260 SourceLocation L; 1261 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1262 // FIXME: Return true in the case when other fields are used before being 1263 // uninitialized. For example, let this field be the i'th field. When 1264 // initializing the i'th field, throw a warning if any of the >= i'th 1265 // fields are used, as they are not yet initialized. 1266 // Right now we are only handling the case where the i'th field uses 1267 // itself in its initializer. 1268 Diag(L, diag::warn_field_is_uninit); 1269 } 1270 } 1271 1272 bool HasDependentArg = false; 1273 for (unsigned i = 0; i < NumArgs; i++) 1274 HasDependentArg |= Args[i]->isTypeDependent(); 1275 1276 if (Member->getType()->isDependentType() || HasDependentArg) { 1277 // Can't check initialization for a member of dependent type or when 1278 // any of the arguments are type-dependent expressions. 1279 Expr *Init 1280 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1281 RParenLoc); 1282 1283 // Erase any temporaries within this evaluation context; we're not 1284 // going to track them in the AST, since we'll be rebuilding the 1285 // ASTs during template instantiation. 1286 ExprTemporaries.erase( 1287 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1288 ExprTemporaries.end()); 1289 1290 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1291 LParenLoc, 1292 Init, 1293 RParenLoc); 1294 1295 } 1296 1297 if (Member->isInvalidDecl()) 1298 return true; 1299 1300 // Initialize the member. 1301 InitializedEntity MemberEntity = 1302 InitializedEntity::InitializeMember(Member, 0); 1303 InitializationKind Kind = 1304 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1305 1306 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1307 1308 ExprResult MemberInit = 1309 InitSeq.Perform(*this, MemberEntity, Kind, 1310 MultiExprArg(*this, Args, NumArgs), 0); 1311 if (MemberInit.isInvalid()) 1312 return true; 1313 1314 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1315 1316 // C++0x [class.base.init]p7: 1317 // The initialization of each base and member constitutes a 1318 // full-expression. 1319 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1320 if (MemberInit.isInvalid()) 1321 return true; 1322 1323 // If we are in a dependent context, template instantiation will 1324 // perform this type-checking again. Just save the arguments that we 1325 // received in a ParenListExpr. 1326 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1327 // of the information that we have about the member 1328 // initializer. However, deconstructing the ASTs is a dicey process, 1329 // and this approach is far more likely to get the corner cases right. 1330 if (CurContext->isDependentContext()) { 1331 // Bump the reference count of all of the arguments. 1332 for (unsigned I = 0; I != NumArgs; ++I) 1333 Args[I]->Retain(); 1334 1335 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1336 RParenLoc); 1337 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1338 LParenLoc, 1339 Init, 1340 RParenLoc); 1341 } 1342 1343 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1344 LParenLoc, 1345 MemberInit.get(), 1346 RParenLoc); 1347} 1348 1349MemInitResult 1350Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1351 Expr **Args, unsigned NumArgs, 1352 SourceLocation LParenLoc, SourceLocation RParenLoc, 1353 CXXRecordDecl *ClassDecl) { 1354 bool HasDependentArg = false; 1355 for (unsigned i = 0; i < NumArgs; i++) 1356 HasDependentArg |= Args[i]->isTypeDependent(); 1357 1358 SourceLocation BaseLoc 1359 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1360 1361 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1362 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1363 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1364 1365 // C++ [class.base.init]p2: 1366 // [...] Unless the mem-initializer-id names a nonstatic data 1367 // member of the constructor’s class or a direct or virtual base 1368 // of that class, the mem-initializer is ill-formed. A 1369 // mem-initializer-list can initialize a base class using any 1370 // name that denotes that base class type. 1371 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1372 1373 // Check for direct and virtual base classes. 1374 const CXXBaseSpecifier *DirectBaseSpec = 0; 1375 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1376 if (!Dependent) { 1377 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1378 VirtualBaseSpec); 1379 1380 // C++ [base.class.init]p2: 1381 // Unless the mem-initializer-id names a nonstatic data member of the 1382 // constructor's class or a direct or virtual base of that class, the 1383 // mem-initializer is ill-formed. 1384 if (!DirectBaseSpec && !VirtualBaseSpec) { 1385 // If the class has any dependent bases, then it's possible that 1386 // one of those types will resolve to the same type as 1387 // BaseType. Therefore, just treat this as a dependent base 1388 // class initialization. FIXME: Should we try to check the 1389 // initialization anyway? It seems odd. 1390 if (ClassDecl->hasAnyDependentBases()) 1391 Dependent = true; 1392 else 1393 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1394 << BaseType << Context.getTypeDeclType(ClassDecl) 1395 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1396 } 1397 } 1398 1399 if (Dependent) { 1400 // Can't check initialization for a base of dependent type or when 1401 // any of the arguments are type-dependent expressions. 1402 ExprResult BaseInit 1403 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1404 RParenLoc)); 1405 1406 // Erase any temporaries within this evaluation context; we're not 1407 // going to track them in the AST, since we'll be rebuilding the 1408 // ASTs during template instantiation. 1409 ExprTemporaries.erase( 1410 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1411 ExprTemporaries.end()); 1412 1413 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1414 /*IsVirtual=*/false, 1415 LParenLoc, 1416 BaseInit.takeAs<Expr>(), 1417 RParenLoc); 1418 } 1419 1420 // C++ [base.class.init]p2: 1421 // If a mem-initializer-id is ambiguous because it designates both 1422 // a direct non-virtual base class and an inherited virtual base 1423 // class, the mem-initializer is ill-formed. 1424 if (DirectBaseSpec && VirtualBaseSpec) 1425 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1426 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1427 1428 CXXBaseSpecifier *BaseSpec 1429 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1430 if (!BaseSpec) 1431 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1432 1433 // Initialize the base. 1434 InitializedEntity BaseEntity = 1435 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1436 InitializationKind Kind = 1437 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1438 1439 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1440 1441 ExprResult BaseInit = 1442 InitSeq.Perform(*this, BaseEntity, Kind, 1443 MultiExprArg(*this, Args, NumArgs), 0); 1444 if (BaseInit.isInvalid()) 1445 return true; 1446 1447 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1448 1449 // C++0x [class.base.init]p7: 1450 // The initialization of each base and member constitutes a 1451 // full-expression. 1452 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1453 if (BaseInit.isInvalid()) 1454 return true; 1455 1456 // If we are in a dependent context, template instantiation will 1457 // perform this type-checking again. Just save the arguments that we 1458 // received in a ParenListExpr. 1459 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1460 // of the information that we have about the base 1461 // initializer. However, deconstructing the ASTs is a dicey process, 1462 // and this approach is far more likely to get the corner cases right. 1463 if (CurContext->isDependentContext()) { 1464 // Bump the reference count of all of the arguments. 1465 for (unsigned I = 0; I != NumArgs; ++I) 1466 Args[I]->Retain(); 1467 1468 ExprResult Init 1469 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1470 RParenLoc)); 1471 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1472 BaseSpec->isVirtual(), 1473 LParenLoc, 1474 Init.takeAs<Expr>(), 1475 RParenLoc); 1476 } 1477 1478 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1479 BaseSpec->isVirtual(), 1480 LParenLoc, 1481 BaseInit.takeAs<Expr>(), 1482 RParenLoc); 1483} 1484 1485/// ImplicitInitializerKind - How an implicit base or member initializer should 1486/// initialize its base or member. 1487enum ImplicitInitializerKind { 1488 IIK_Default, 1489 IIK_Copy, 1490 IIK_Move 1491}; 1492 1493static bool 1494BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1495 ImplicitInitializerKind ImplicitInitKind, 1496 CXXBaseSpecifier *BaseSpec, 1497 bool IsInheritedVirtualBase, 1498 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1499 InitializedEntity InitEntity 1500 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1501 IsInheritedVirtualBase); 1502 1503 ExprResult BaseInit; 1504 1505 switch (ImplicitInitKind) { 1506 case IIK_Default: { 1507 InitializationKind InitKind 1508 = InitializationKind::CreateDefault(Constructor->getLocation()); 1509 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1510 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1511 MultiExprArg(SemaRef, 0, 0)); 1512 break; 1513 } 1514 1515 case IIK_Copy: { 1516 ParmVarDecl *Param = Constructor->getParamDecl(0); 1517 QualType ParamType = Param->getType().getNonReferenceType(); 1518 1519 Expr *CopyCtorArg = 1520 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1521 Constructor->getLocation(), ParamType, 0); 1522 1523 // Cast to the base class to avoid ambiguities. 1524 QualType ArgTy = 1525 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1526 ParamType.getQualifiers()); 1527 1528 CXXCastPath BasePath; 1529 BasePath.push_back(BaseSpec); 1530 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1531 CK_UncheckedDerivedToBase, 1532 VK_LValue, &BasePath); 1533 1534 InitializationKind InitKind 1535 = InitializationKind::CreateDirect(Constructor->getLocation(), 1536 SourceLocation(), SourceLocation()); 1537 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1538 &CopyCtorArg, 1); 1539 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1540 MultiExprArg(&CopyCtorArg, 1)); 1541 break; 1542 } 1543 1544 case IIK_Move: 1545 assert(false && "Unhandled initializer kind!"); 1546 } 1547 1548 if (BaseInit.isInvalid()) 1549 return true; 1550 1551 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1552 if (BaseInit.isInvalid()) 1553 return true; 1554 1555 CXXBaseInit = 1556 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1557 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1558 SourceLocation()), 1559 BaseSpec->isVirtual(), 1560 SourceLocation(), 1561 BaseInit.takeAs<Expr>(), 1562 SourceLocation()); 1563 1564 return false; 1565} 1566 1567static bool 1568BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1569 ImplicitInitializerKind ImplicitInitKind, 1570 FieldDecl *Field, 1571 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1572 if (Field->isInvalidDecl()) 1573 return true; 1574 1575 SourceLocation Loc = Constructor->getLocation(); 1576 1577 if (ImplicitInitKind == IIK_Copy) { 1578 ParmVarDecl *Param = Constructor->getParamDecl(0); 1579 QualType ParamType = Param->getType().getNonReferenceType(); 1580 1581 Expr *MemberExprBase = 1582 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1583 Loc, ParamType, 0); 1584 1585 // Build a reference to this field within the parameter. 1586 CXXScopeSpec SS; 1587 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1588 Sema::LookupMemberName); 1589 MemberLookup.addDecl(Field, AS_public); 1590 MemberLookup.resolveKind(); 1591 ExprResult CopyCtorArg 1592 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1593 ParamType, Loc, 1594 /*IsArrow=*/false, 1595 SS, 1596 /*FirstQualifierInScope=*/0, 1597 MemberLookup, 1598 /*TemplateArgs=*/0); 1599 if (CopyCtorArg.isInvalid()) 1600 return true; 1601 1602 // When the field we are copying is an array, create index variables for 1603 // each dimension of the array. We use these index variables to subscript 1604 // the source array, and other clients (e.g., CodeGen) will perform the 1605 // necessary iteration with these index variables. 1606 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1607 QualType BaseType = Field->getType(); 1608 QualType SizeType = SemaRef.Context.getSizeType(); 1609 while (const ConstantArrayType *Array 1610 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1611 // Create the iteration variable for this array index. 1612 IdentifierInfo *IterationVarName = 0; 1613 { 1614 llvm::SmallString<8> Str; 1615 llvm::raw_svector_ostream OS(Str); 1616 OS << "__i" << IndexVariables.size(); 1617 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1618 } 1619 VarDecl *IterationVar 1620 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1621 IterationVarName, SizeType, 1622 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1623 SC_None, SC_None); 1624 IndexVariables.push_back(IterationVar); 1625 1626 // Create a reference to the iteration variable. 1627 ExprResult IterationVarRef 1628 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1629 assert(!IterationVarRef.isInvalid() && 1630 "Reference to invented variable cannot fail!"); 1631 1632 // Subscript the array with this iteration variable. 1633 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1634 Loc, 1635 IterationVarRef.take(), 1636 Loc); 1637 if (CopyCtorArg.isInvalid()) 1638 return true; 1639 1640 BaseType = Array->getElementType(); 1641 } 1642 1643 // Construct the entity that we will be initializing. For an array, this 1644 // will be first element in the array, which may require several levels 1645 // of array-subscript entities. 1646 llvm::SmallVector<InitializedEntity, 4> Entities; 1647 Entities.reserve(1 + IndexVariables.size()); 1648 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1649 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1650 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1651 0, 1652 Entities.back())); 1653 1654 // Direct-initialize to use the copy constructor. 1655 InitializationKind InitKind = 1656 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1657 1658 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1659 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1660 &CopyCtorArgE, 1); 1661 1662 ExprResult MemberInit 1663 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1664 MultiExprArg(&CopyCtorArgE, 1)); 1665 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1666 if (MemberInit.isInvalid()) 1667 return true; 1668 1669 CXXMemberInit 1670 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1671 MemberInit.takeAs<Expr>(), Loc, 1672 IndexVariables.data(), 1673 IndexVariables.size()); 1674 return false; 1675 } 1676 1677 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1678 1679 QualType FieldBaseElementType = 1680 SemaRef.Context.getBaseElementType(Field->getType()); 1681 1682 if (FieldBaseElementType->isRecordType()) { 1683 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1684 InitializationKind InitKind = 1685 InitializationKind::CreateDefault(Loc); 1686 1687 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1688 ExprResult MemberInit = 1689 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1690 if (MemberInit.isInvalid()) 1691 return true; 1692 1693 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1694 if (MemberInit.isInvalid()) 1695 return true; 1696 1697 CXXMemberInit = 1698 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1699 Field, Loc, Loc, 1700 MemberInit.get(), 1701 Loc); 1702 return false; 1703 } 1704 1705 if (FieldBaseElementType->isReferenceType()) { 1706 SemaRef.Diag(Constructor->getLocation(), 1707 diag::err_uninitialized_member_in_ctor) 1708 << (int)Constructor->isImplicit() 1709 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1710 << 0 << Field->getDeclName(); 1711 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1712 return true; 1713 } 1714 1715 if (FieldBaseElementType.isConstQualified()) { 1716 SemaRef.Diag(Constructor->getLocation(), 1717 diag::err_uninitialized_member_in_ctor) 1718 << (int)Constructor->isImplicit() 1719 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1720 << 1 << Field->getDeclName(); 1721 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1722 return true; 1723 } 1724 1725 // Nothing to initialize. 1726 CXXMemberInit = 0; 1727 return false; 1728} 1729 1730namespace { 1731struct BaseAndFieldInfo { 1732 Sema &S; 1733 CXXConstructorDecl *Ctor; 1734 bool AnyErrorsInInits; 1735 ImplicitInitializerKind IIK; 1736 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1737 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1738 1739 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1740 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1741 // FIXME: Handle implicit move constructors. 1742 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1743 IIK = IIK_Copy; 1744 else 1745 IIK = IIK_Default; 1746 } 1747}; 1748} 1749 1750static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1751 FieldDecl *Top, FieldDecl *Field, 1752 CXXBaseOrMemberInitializer *Init) { 1753 // If the member doesn't need to be initialized, Init will still be null. 1754 if (!Init) 1755 return; 1756 1757 Info.AllToInit.push_back(Init); 1758 if (Field != Top) { 1759 Init->setMember(Top); 1760 Init->setAnonUnionMember(Field); 1761 } 1762} 1763 1764static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1765 FieldDecl *Top, FieldDecl *Field) { 1766 1767 // Overwhelmingly common case: we have a direct initializer for this field. 1768 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1769 RecordFieldInitializer(Info, Top, Field, Init); 1770 return false; 1771 } 1772 1773 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1774 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1775 assert(FieldClassType && "anonymous struct/union without record type"); 1776 CXXRecordDecl *FieldClassDecl 1777 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1778 1779 // Even though union members never have non-trivial default 1780 // constructions in C++03, we still build member initializers for aggregate 1781 // record types which can be union members, and C++0x allows non-trivial 1782 // default constructors for union members, so we ensure that only one 1783 // member is initialized for these. 1784 if (FieldClassDecl->isUnion()) { 1785 // First check for an explicit initializer for one field. 1786 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1787 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1788 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1789 RecordFieldInitializer(Info, Top, *FA, Init); 1790 1791 // Once we've initialized a field of an anonymous union, the union 1792 // field in the class is also initialized, so exit immediately. 1793 return false; 1794 } else if ((*FA)->isAnonymousStructOrUnion()) { 1795 if (CollectFieldInitializer(Info, Top, *FA)) 1796 return true; 1797 } 1798 } 1799 1800 // Fallthrough and construct a default initializer for the union as 1801 // a whole, which can call its default constructor if such a thing exists 1802 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1803 // behavior going forward with C++0x, when anonymous unions there are 1804 // finalized, we should revisit this. 1805 } else { 1806 // For structs, we simply descend through to initialize all members where 1807 // necessary. 1808 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1809 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1810 if (CollectFieldInitializer(Info, Top, *FA)) 1811 return true; 1812 } 1813 } 1814 } 1815 1816 // Don't try to build an implicit initializer if there were semantic 1817 // errors in any of the initializers (and therefore we might be 1818 // missing some that the user actually wrote). 1819 if (Info.AnyErrorsInInits) 1820 return false; 1821 1822 CXXBaseOrMemberInitializer *Init = 0; 1823 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1824 return true; 1825 1826 RecordFieldInitializer(Info, Top, Field, Init); 1827 return false; 1828} 1829 1830bool 1831Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1832 CXXBaseOrMemberInitializer **Initializers, 1833 unsigned NumInitializers, 1834 bool AnyErrors) { 1835 if (Constructor->getDeclContext()->isDependentContext()) { 1836 // Just store the initializers as written, they will be checked during 1837 // instantiation. 1838 if (NumInitializers > 0) { 1839 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1840 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1841 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1842 memcpy(baseOrMemberInitializers, Initializers, 1843 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1844 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1845 } 1846 1847 return false; 1848 } 1849 1850 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1851 1852 // We need to build the initializer AST according to order of construction 1853 // and not what user specified in the Initializers list. 1854 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1855 if (!ClassDecl) 1856 return true; 1857 1858 bool HadError = false; 1859 1860 for (unsigned i = 0; i < NumInitializers; i++) { 1861 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1862 1863 if (Member->isBaseInitializer()) 1864 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1865 else 1866 Info.AllBaseFields[Member->getMember()] = Member; 1867 } 1868 1869 // Keep track of the direct virtual bases. 1870 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1871 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1872 E = ClassDecl->bases_end(); I != E; ++I) { 1873 if (I->isVirtual()) 1874 DirectVBases.insert(I); 1875 } 1876 1877 // Push virtual bases before others. 1878 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1879 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1880 1881 if (CXXBaseOrMemberInitializer *Value 1882 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1883 Info.AllToInit.push_back(Value); 1884 } else if (!AnyErrors) { 1885 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1886 CXXBaseOrMemberInitializer *CXXBaseInit; 1887 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1888 VBase, IsInheritedVirtualBase, 1889 CXXBaseInit)) { 1890 HadError = true; 1891 continue; 1892 } 1893 1894 Info.AllToInit.push_back(CXXBaseInit); 1895 } 1896 } 1897 1898 // Non-virtual bases. 1899 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1900 E = ClassDecl->bases_end(); Base != E; ++Base) { 1901 // Virtuals are in the virtual base list and already constructed. 1902 if (Base->isVirtual()) 1903 continue; 1904 1905 if (CXXBaseOrMemberInitializer *Value 1906 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1907 Info.AllToInit.push_back(Value); 1908 } else if (!AnyErrors) { 1909 CXXBaseOrMemberInitializer *CXXBaseInit; 1910 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1911 Base, /*IsInheritedVirtualBase=*/false, 1912 CXXBaseInit)) { 1913 HadError = true; 1914 continue; 1915 } 1916 1917 Info.AllToInit.push_back(CXXBaseInit); 1918 } 1919 } 1920 1921 // Fields. 1922 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1923 E = ClassDecl->field_end(); Field != E; ++Field) { 1924 if ((*Field)->getType()->isIncompleteArrayType()) { 1925 assert(ClassDecl->hasFlexibleArrayMember() && 1926 "Incomplete array type is not valid"); 1927 continue; 1928 } 1929 if (CollectFieldInitializer(Info, *Field, *Field)) 1930 HadError = true; 1931 } 1932 1933 NumInitializers = Info.AllToInit.size(); 1934 if (NumInitializers > 0) { 1935 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1936 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1937 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1938 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1939 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1940 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1941 1942 // Constructors implicitly reference the base and member 1943 // destructors. 1944 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1945 Constructor->getParent()); 1946 } 1947 1948 return HadError; 1949} 1950 1951static void *GetKeyForTopLevelField(FieldDecl *Field) { 1952 // For anonymous unions, use the class declaration as the key. 1953 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1954 if (RT->getDecl()->isAnonymousStructOrUnion()) 1955 return static_cast<void *>(RT->getDecl()); 1956 } 1957 return static_cast<void *>(Field); 1958} 1959 1960static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1961 return Context.getCanonicalType(BaseType).getTypePtr(); 1962} 1963 1964static void *GetKeyForMember(ASTContext &Context, 1965 CXXBaseOrMemberInitializer *Member, 1966 bool MemberMaybeAnon = false) { 1967 if (!Member->isMemberInitializer()) 1968 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1969 1970 // For fields injected into the class via declaration of an anonymous union, 1971 // use its anonymous union class declaration as the unique key. 1972 FieldDecl *Field = Member->getMember(); 1973 1974 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1975 // data member of the class. Data member used in the initializer list is 1976 // in AnonUnionMember field. 1977 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1978 Field = Member->getAnonUnionMember(); 1979 1980 // If the field is a member of an anonymous struct or union, our key 1981 // is the anonymous record decl that's a direct child of the class. 1982 RecordDecl *RD = Field->getParent(); 1983 if (RD->isAnonymousStructOrUnion()) { 1984 while (true) { 1985 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1986 if (Parent->isAnonymousStructOrUnion()) 1987 RD = Parent; 1988 else 1989 break; 1990 } 1991 1992 return static_cast<void *>(RD); 1993 } 1994 1995 return static_cast<void *>(Field); 1996} 1997 1998static void 1999DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2000 const CXXConstructorDecl *Constructor, 2001 CXXBaseOrMemberInitializer **Inits, 2002 unsigned NumInits) { 2003 if (Constructor->getDeclContext()->isDependentContext()) 2004 return; 2005 2006 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2007 == Diagnostic::Ignored) 2008 return; 2009 2010 // Build the list of bases and members in the order that they'll 2011 // actually be initialized. The explicit initializers should be in 2012 // this same order but may be missing things. 2013 llvm::SmallVector<const void*, 32> IdealInitKeys; 2014 2015 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2016 2017 // 1. Virtual bases. 2018 for (CXXRecordDecl::base_class_const_iterator VBase = 2019 ClassDecl->vbases_begin(), 2020 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2021 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2022 2023 // 2. Non-virtual bases. 2024 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2025 E = ClassDecl->bases_end(); Base != E; ++Base) { 2026 if (Base->isVirtual()) 2027 continue; 2028 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2029 } 2030 2031 // 3. Direct fields. 2032 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2033 E = ClassDecl->field_end(); Field != E; ++Field) 2034 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2035 2036 unsigned NumIdealInits = IdealInitKeys.size(); 2037 unsigned IdealIndex = 0; 2038 2039 CXXBaseOrMemberInitializer *PrevInit = 0; 2040 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2041 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2042 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2043 2044 // Scan forward to try to find this initializer in the idealized 2045 // initializers list. 2046 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2047 if (InitKey == IdealInitKeys[IdealIndex]) 2048 break; 2049 2050 // If we didn't find this initializer, it must be because we 2051 // scanned past it on a previous iteration. That can only 2052 // happen if we're out of order; emit a warning. 2053 if (IdealIndex == NumIdealInits && PrevInit) { 2054 Sema::SemaDiagnosticBuilder D = 2055 SemaRef.Diag(PrevInit->getSourceLocation(), 2056 diag::warn_initializer_out_of_order); 2057 2058 if (PrevInit->isMemberInitializer()) 2059 D << 0 << PrevInit->getMember()->getDeclName(); 2060 else 2061 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2062 2063 if (Init->isMemberInitializer()) 2064 D << 0 << Init->getMember()->getDeclName(); 2065 else 2066 D << 1 << Init->getBaseClassInfo()->getType(); 2067 2068 // Move back to the initializer's location in the ideal list. 2069 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2070 if (InitKey == IdealInitKeys[IdealIndex]) 2071 break; 2072 2073 assert(IdealIndex != NumIdealInits && 2074 "initializer not found in initializer list"); 2075 } 2076 2077 PrevInit = Init; 2078 } 2079} 2080 2081namespace { 2082bool CheckRedundantInit(Sema &S, 2083 CXXBaseOrMemberInitializer *Init, 2084 CXXBaseOrMemberInitializer *&PrevInit) { 2085 if (!PrevInit) { 2086 PrevInit = Init; 2087 return false; 2088 } 2089 2090 if (FieldDecl *Field = Init->getMember()) 2091 S.Diag(Init->getSourceLocation(), 2092 diag::err_multiple_mem_initialization) 2093 << Field->getDeclName() 2094 << Init->getSourceRange(); 2095 else { 2096 Type *BaseClass = Init->getBaseClass(); 2097 assert(BaseClass && "neither field nor base"); 2098 S.Diag(Init->getSourceLocation(), 2099 diag::err_multiple_base_initialization) 2100 << QualType(BaseClass, 0) 2101 << Init->getSourceRange(); 2102 } 2103 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2104 << 0 << PrevInit->getSourceRange(); 2105 2106 return true; 2107} 2108 2109typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2110typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2111 2112bool CheckRedundantUnionInit(Sema &S, 2113 CXXBaseOrMemberInitializer *Init, 2114 RedundantUnionMap &Unions) { 2115 FieldDecl *Field = Init->getMember(); 2116 RecordDecl *Parent = Field->getParent(); 2117 if (!Parent->isAnonymousStructOrUnion()) 2118 return false; 2119 2120 NamedDecl *Child = Field; 2121 do { 2122 if (Parent->isUnion()) { 2123 UnionEntry &En = Unions[Parent]; 2124 if (En.first && En.first != Child) { 2125 S.Diag(Init->getSourceLocation(), 2126 diag::err_multiple_mem_union_initialization) 2127 << Field->getDeclName() 2128 << Init->getSourceRange(); 2129 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2130 << 0 << En.second->getSourceRange(); 2131 return true; 2132 } else if (!En.first) { 2133 En.first = Child; 2134 En.second = Init; 2135 } 2136 } 2137 2138 Child = Parent; 2139 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2140 } while (Parent->isAnonymousStructOrUnion()); 2141 2142 return false; 2143} 2144} 2145 2146/// ActOnMemInitializers - Handle the member initializers for a constructor. 2147void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2148 SourceLocation ColonLoc, 2149 MemInitTy **meminits, unsigned NumMemInits, 2150 bool AnyErrors) { 2151 if (!ConstructorDecl) 2152 return; 2153 2154 AdjustDeclIfTemplate(ConstructorDecl); 2155 2156 CXXConstructorDecl *Constructor 2157 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2158 2159 if (!Constructor) { 2160 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2161 return; 2162 } 2163 2164 CXXBaseOrMemberInitializer **MemInits = 2165 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2166 2167 // Mapping for the duplicate initializers check. 2168 // For member initializers, this is keyed with a FieldDecl*. 2169 // For base initializers, this is keyed with a Type*. 2170 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2171 2172 // Mapping for the inconsistent anonymous-union initializers check. 2173 RedundantUnionMap MemberUnions; 2174 2175 bool HadError = false; 2176 for (unsigned i = 0; i < NumMemInits; i++) { 2177 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2178 2179 // Set the source order index. 2180 Init->setSourceOrder(i); 2181 2182 if (Init->isMemberInitializer()) { 2183 FieldDecl *Field = Init->getMember(); 2184 if (CheckRedundantInit(*this, Init, Members[Field]) || 2185 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2186 HadError = true; 2187 } else { 2188 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2189 if (CheckRedundantInit(*this, Init, Members[Key])) 2190 HadError = true; 2191 } 2192 } 2193 2194 if (HadError) 2195 return; 2196 2197 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2198 2199 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2200} 2201 2202void 2203Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2204 CXXRecordDecl *ClassDecl) { 2205 // Ignore dependent contexts. 2206 if (ClassDecl->isDependentContext()) 2207 return; 2208 2209 // FIXME: all the access-control diagnostics are positioned on the 2210 // field/base declaration. That's probably good; that said, the 2211 // user might reasonably want to know why the destructor is being 2212 // emitted, and we currently don't say. 2213 2214 // Non-static data members. 2215 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2216 E = ClassDecl->field_end(); I != E; ++I) { 2217 FieldDecl *Field = *I; 2218 if (Field->isInvalidDecl()) 2219 continue; 2220 QualType FieldType = Context.getBaseElementType(Field->getType()); 2221 2222 const RecordType* RT = FieldType->getAs<RecordType>(); 2223 if (!RT) 2224 continue; 2225 2226 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2227 if (FieldClassDecl->hasTrivialDestructor()) 2228 continue; 2229 2230 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2231 CheckDestructorAccess(Field->getLocation(), Dtor, 2232 PDiag(diag::err_access_dtor_field) 2233 << Field->getDeclName() 2234 << FieldType); 2235 2236 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2237 } 2238 2239 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2240 2241 // Bases. 2242 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2243 E = ClassDecl->bases_end(); Base != E; ++Base) { 2244 // Bases are always records in a well-formed non-dependent class. 2245 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2246 2247 // Remember direct virtual bases. 2248 if (Base->isVirtual()) 2249 DirectVirtualBases.insert(RT); 2250 2251 // Ignore trivial destructors. 2252 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2253 if (BaseClassDecl->hasTrivialDestructor()) 2254 continue; 2255 2256 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2257 2258 // FIXME: caret should be on the start of the class name 2259 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2260 PDiag(diag::err_access_dtor_base) 2261 << Base->getType() 2262 << Base->getSourceRange()); 2263 2264 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2265 } 2266 2267 // Virtual bases. 2268 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2269 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2270 2271 // Bases are always records in a well-formed non-dependent class. 2272 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2273 2274 // Ignore direct virtual bases. 2275 if (DirectVirtualBases.count(RT)) 2276 continue; 2277 2278 // Ignore trivial destructors. 2279 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2280 if (BaseClassDecl->hasTrivialDestructor()) 2281 continue; 2282 2283 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2284 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2285 PDiag(diag::err_access_dtor_vbase) 2286 << VBase->getType()); 2287 2288 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2289 } 2290} 2291 2292void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2293 if (!CDtorDecl) 2294 return; 2295 2296 if (CXXConstructorDecl *Constructor 2297 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2298 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2299} 2300 2301bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2302 unsigned DiagID, AbstractDiagSelID SelID) { 2303 if (SelID == -1) 2304 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2305 else 2306 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2307} 2308 2309bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2310 const PartialDiagnostic &PD) { 2311 if (!getLangOptions().CPlusPlus) 2312 return false; 2313 2314 if (const ArrayType *AT = Context.getAsArrayType(T)) 2315 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2316 2317 if (const PointerType *PT = T->getAs<PointerType>()) { 2318 // Find the innermost pointer type. 2319 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2320 PT = T; 2321 2322 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2323 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2324 } 2325 2326 const RecordType *RT = T->getAs<RecordType>(); 2327 if (!RT) 2328 return false; 2329 2330 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2331 2332 // We can't answer whether something is abstract until it has a 2333 // definition. If it's currently being defined, we'll walk back 2334 // over all the declarations when we have a full definition. 2335 const CXXRecordDecl *Def = RD->getDefinition(); 2336 if (!Def || Def->isBeingDefined()) 2337 return false; 2338 2339 if (!RD->isAbstract()) 2340 return false; 2341 2342 Diag(Loc, PD) << RD->getDeclName(); 2343 DiagnoseAbstractType(RD); 2344 2345 return true; 2346} 2347 2348void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2349 // Check if we've already emitted the list of pure virtual functions 2350 // for this class. 2351 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2352 return; 2353 2354 CXXFinalOverriderMap FinalOverriders; 2355 RD->getFinalOverriders(FinalOverriders); 2356 2357 // Keep a set of seen pure methods so we won't diagnose the same method 2358 // more than once. 2359 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2360 2361 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2362 MEnd = FinalOverriders.end(); 2363 M != MEnd; 2364 ++M) { 2365 for (OverridingMethods::iterator SO = M->second.begin(), 2366 SOEnd = M->second.end(); 2367 SO != SOEnd; ++SO) { 2368 // C++ [class.abstract]p4: 2369 // A class is abstract if it contains or inherits at least one 2370 // pure virtual function for which the final overrider is pure 2371 // virtual. 2372 2373 // 2374 if (SO->second.size() != 1) 2375 continue; 2376 2377 if (!SO->second.front().Method->isPure()) 2378 continue; 2379 2380 if (!SeenPureMethods.insert(SO->second.front().Method)) 2381 continue; 2382 2383 Diag(SO->second.front().Method->getLocation(), 2384 diag::note_pure_virtual_function) 2385 << SO->second.front().Method->getDeclName(); 2386 } 2387 } 2388 2389 if (!PureVirtualClassDiagSet) 2390 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2391 PureVirtualClassDiagSet->insert(RD); 2392} 2393 2394namespace { 2395struct AbstractUsageInfo { 2396 Sema &S; 2397 CXXRecordDecl *Record; 2398 CanQualType AbstractType; 2399 bool Invalid; 2400 2401 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2402 : S(S), Record(Record), 2403 AbstractType(S.Context.getCanonicalType( 2404 S.Context.getTypeDeclType(Record))), 2405 Invalid(false) {} 2406 2407 void DiagnoseAbstractType() { 2408 if (Invalid) return; 2409 S.DiagnoseAbstractType(Record); 2410 Invalid = true; 2411 } 2412 2413 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2414}; 2415 2416struct CheckAbstractUsage { 2417 AbstractUsageInfo &Info; 2418 const NamedDecl *Ctx; 2419 2420 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2421 : Info(Info), Ctx(Ctx) {} 2422 2423 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2424 switch (TL.getTypeLocClass()) { 2425#define ABSTRACT_TYPELOC(CLASS, PARENT) 2426#define TYPELOC(CLASS, PARENT) \ 2427 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2428#include "clang/AST/TypeLocNodes.def" 2429 } 2430 } 2431 2432 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2433 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2434 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2435 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2436 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2437 } 2438 } 2439 2440 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2441 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2442 } 2443 2444 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2445 // Visit the type parameters from a permissive context. 2446 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2447 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2448 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2449 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2450 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2451 // TODO: other template argument types? 2452 } 2453 } 2454 2455 // Visit pointee types from a permissive context. 2456#define CheckPolymorphic(Type) \ 2457 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2458 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2459 } 2460 CheckPolymorphic(PointerTypeLoc) 2461 CheckPolymorphic(ReferenceTypeLoc) 2462 CheckPolymorphic(MemberPointerTypeLoc) 2463 CheckPolymorphic(BlockPointerTypeLoc) 2464 2465 /// Handle all the types we haven't given a more specific 2466 /// implementation for above. 2467 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2468 // Every other kind of type that we haven't called out already 2469 // that has an inner type is either (1) sugar or (2) contains that 2470 // inner type in some way as a subobject. 2471 if (TypeLoc Next = TL.getNextTypeLoc()) 2472 return Visit(Next, Sel); 2473 2474 // If there's no inner type and we're in a permissive context, 2475 // don't diagnose. 2476 if (Sel == Sema::AbstractNone) return; 2477 2478 // Check whether the type matches the abstract type. 2479 QualType T = TL.getType(); 2480 if (T->isArrayType()) { 2481 Sel = Sema::AbstractArrayType; 2482 T = Info.S.Context.getBaseElementType(T); 2483 } 2484 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2485 if (CT != Info.AbstractType) return; 2486 2487 // It matched; do some magic. 2488 if (Sel == Sema::AbstractArrayType) { 2489 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2490 << T << TL.getSourceRange(); 2491 } else { 2492 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2493 << Sel << T << TL.getSourceRange(); 2494 } 2495 Info.DiagnoseAbstractType(); 2496 } 2497}; 2498 2499void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2500 Sema::AbstractDiagSelID Sel) { 2501 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2502} 2503 2504} 2505 2506/// Check for invalid uses of an abstract type in a method declaration. 2507static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2508 CXXMethodDecl *MD) { 2509 // No need to do the check on definitions, which require that 2510 // the return/param types be complete. 2511 if (MD->isThisDeclarationADefinition()) 2512 return; 2513 2514 // For safety's sake, just ignore it if we don't have type source 2515 // information. This should never happen for non-implicit methods, 2516 // but... 2517 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2518 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2519} 2520 2521/// Check for invalid uses of an abstract type within a class definition. 2522static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2523 CXXRecordDecl *RD) { 2524 for (CXXRecordDecl::decl_iterator 2525 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2526 Decl *D = *I; 2527 if (D->isImplicit()) continue; 2528 2529 // Methods and method templates. 2530 if (isa<CXXMethodDecl>(D)) { 2531 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2532 } else if (isa<FunctionTemplateDecl>(D)) { 2533 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2534 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2535 2536 // Fields and static variables. 2537 } else if (isa<FieldDecl>(D)) { 2538 FieldDecl *FD = cast<FieldDecl>(D); 2539 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2540 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2541 } else if (isa<VarDecl>(D)) { 2542 VarDecl *VD = cast<VarDecl>(D); 2543 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2544 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2545 2546 // Nested classes and class templates. 2547 } else if (isa<CXXRecordDecl>(D)) { 2548 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2549 } else if (isa<ClassTemplateDecl>(D)) { 2550 CheckAbstractClassUsage(Info, 2551 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2552 } 2553 } 2554} 2555 2556/// \brief Perform semantic checks on a class definition that has been 2557/// completing, introducing implicitly-declared members, checking for 2558/// abstract types, etc. 2559void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2560 if (!Record) 2561 return; 2562 2563 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2564 AbstractUsageInfo Info(*this, Record); 2565 CheckAbstractClassUsage(Info, Record); 2566 } 2567 2568 // If this is not an aggregate type and has no user-declared constructor, 2569 // complain about any non-static data members of reference or const scalar 2570 // type, since they will never get initializers. 2571 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2572 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2573 bool Complained = false; 2574 for (RecordDecl::field_iterator F = Record->field_begin(), 2575 FEnd = Record->field_end(); 2576 F != FEnd; ++F) { 2577 if (F->getType()->isReferenceType() || 2578 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2579 if (!Complained) { 2580 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2581 << Record->getTagKind() << Record; 2582 Complained = true; 2583 } 2584 2585 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2586 << F->getType()->isReferenceType() 2587 << F->getDeclName(); 2588 } 2589 } 2590 } 2591 2592 if (Record->isDynamicClass()) 2593 DynamicClasses.push_back(Record); 2594} 2595 2596void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2597 Decl *TagDecl, 2598 SourceLocation LBrac, 2599 SourceLocation RBrac, 2600 AttributeList *AttrList) { 2601 if (!TagDecl) 2602 return; 2603 2604 AdjustDeclIfTemplate(TagDecl); 2605 2606 ActOnFields(S, RLoc, TagDecl, 2607 // strict aliasing violation! 2608 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2609 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2610 2611 CheckCompletedCXXClass( 2612 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2613} 2614 2615namespace { 2616 /// \brief Helper class that collects exception specifications for 2617 /// implicitly-declared special member functions. 2618 class ImplicitExceptionSpecification { 2619 ASTContext &Context; 2620 bool AllowsAllExceptions; 2621 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2622 llvm::SmallVector<QualType, 4> Exceptions; 2623 2624 public: 2625 explicit ImplicitExceptionSpecification(ASTContext &Context) 2626 : Context(Context), AllowsAllExceptions(false) { } 2627 2628 /// \brief Whether the special member function should have any 2629 /// exception specification at all. 2630 bool hasExceptionSpecification() const { 2631 return !AllowsAllExceptions; 2632 } 2633 2634 /// \brief Whether the special member function should have a 2635 /// throw(...) exception specification (a Microsoft extension). 2636 bool hasAnyExceptionSpecification() const { 2637 return false; 2638 } 2639 2640 /// \brief The number of exceptions in the exception specification. 2641 unsigned size() const { return Exceptions.size(); } 2642 2643 /// \brief The set of exceptions in the exception specification. 2644 const QualType *data() const { return Exceptions.data(); } 2645 2646 /// \brief Note that 2647 void CalledDecl(CXXMethodDecl *Method) { 2648 // If we already know that we allow all exceptions, do nothing. 2649 if (AllowsAllExceptions || !Method) 2650 return; 2651 2652 const FunctionProtoType *Proto 2653 = Method->getType()->getAs<FunctionProtoType>(); 2654 2655 // If this function can throw any exceptions, make a note of that. 2656 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2657 AllowsAllExceptions = true; 2658 ExceptionsSeen.clear(); 2659 Exceptions.clear(); 2660 return; 2661 } 2662 2663 // Record the exceptions in this function's exception specification. 2664 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2665 EEnd = Proto->exception_end(); 2666 E != EEnd; ++E) 2667 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2668 Exceptions.push_back(*E); 2669 } 2670 }; 2671} 2672 2673 2674/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2675/// special functions, such as the default constructor, copy 2676/// constructor, or destructor, to the given C++ class (C++ 2677/// [special]p1). This routine can only be executed just before the 2678/// definition of the class is complete. 2679void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2680 if (!ClassDecl->hasUserDeclaredConstructor()) 2681 ++ASTContext::NumImplicitDefaultConstructors; 2682 2683 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2684 ++ASTContext::NumImplicitCopyConstructors; 2685 2686 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2687 ++ASTContext::NumImplicitCopyAssignmentOperators; 2688 2689 // If we have a dynamic class, then the copy assignment operator may be 2690 // virtual, so we have to declare it immediately. This ensures that, e.g., 2691 // it shows up in the right place in the vtable and that we diagnose 2692 // problems with the implicit exception specification. 2693 if (ClassDecl->isDynamicClass()) 2694 DeclareImplicitCopyAssignment(ClassDecl); 2695 } 2696 2697 if (!ClassDecl->hasUserDeclaredDestructor()) { 2698 ++ASTContext::NumImplicitDestructors; 2699 2700 // If we have a dynamic class, then the destructor may be virtual, so we 2701 // have to declare the destructor immediately. This ensures that, e.g., it 2702 // shows up in the right place in the vtable and that we diagnose problems 2703 // with the implicit exception specification. 2704 if (ClassDecl->isDynamicClass()) 2705 DeclareImplicitDestructor(ClassDecl); 2706 } 2707} 2708 2709void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2710 if (!D) 2711 return; 2712 2713 TemplateParameterList *Params = 0; 2714 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2715 Params = Template->getTemplateParameters(); 2716 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2717 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2718 Params = PartialSpec->getTemplateParameters(); 2719 else 2720 return; 2721 2722 for (TemplateParameterList::iterator Param = Params->begin(), 2723 ParamEnd = Params->end(); 2724 Param != ParamEnd; ++Param) { 2725 NamedDecl *Named = cast<NamedDecl>(*Param); 2726 if (Named->getDeclName()) { 2727 S->AddDecl(Named); 2728 IdResolver.AddDecl(Named); 2729 } 2730 } 2731} 2732 2733void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2734 if (!RecordD) return; 2735 AdjustDeclIfTemplate(RecordD); 2736 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2737 PushDeclContext(S, Record); 2738} 2739 2740void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2741 if (!RecordD) return; 2742 PopDeclContext(); 2743} 2744 2745/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2746/// parsing a top-level (non-nested) C++ class, and we are now 2747/// parsing those parts of the given Method declaration that could 2748/// not be parsed earlier (C++ [class.mem]p2), such as default 2749/// arguments. This action should enter the scope of the given 2750/// Method declaration as if we had just parsed the qualified method 2751/// name. However, it should not bring the parameters into scope; 2752/// that will be performed by ActOnDelayedCXXMethodParameter. 2753void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2754} 2755 2756/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2757/// C++ method declaration. We're (re-)introducing the given 2758/// function parameter into scope for use in parsing later parts of 2759/// the method declaration. For example, we could see an 2760/// ActOnParamDefaultArgument event for this parameter. 2761void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2762 if (!ParamD) 2763 return; 2764 2765 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2766 2767 // If this parameter has an unparsed default argument, clear it out 2768 // to make way for the parsed default argument. 2769 if (Param->hasUnparsedDefaultArg()) 2770 Param->setDefaultArg(0); 2771 2772 S->AddDecl(Param); 2773 if (Param->getDeclName()) 2774 IdResolver.AddDecl(Param); 2775} 2776 2777/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2778/// processing the delayed method declaration for Method. The method 2779/// declaration is now considered finished. There may be a separate 2780/// ActOnStartOfFunctionDef action later (not necessarily 2781/// immediately!) for this method, if it was also defined inside the 2782/// class body. 2783void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2784 if (!MethodD) 2785 return; 2786 2787 AdjustDeclIfTemplate(MethodD); 2788 2789 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2790 2791 // Now that we have our default arguments, check the constructor 2792 // again. It could produce additional diagnostics or affect whether 2793 // the class has implicitly-declared destructors, among other 2794 // things. 2795 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2796 CheckConstructor(Constructor); 2797 2798 // Check the default arguments, which we may have added. 2799 if (!Method->isInvalidDecl()) 2800 CheckCXXDefaultArguments(Method); 2801} 2802 2803/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2804/// the well-formedness of the constructor declarator @p D with type @p 2805/// R. If there are any errors in the declarator, this routine will 2806/// emit diagnostics and set the invalid bit to true. In any case, the type 2807/// will be updated to reflect a well-formed type for the constructor and 2808/// returned. 2809QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2810 StorageClass &SC) { 2811 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2812 2813 // C++ [class.ctor]p3: 2814 // A constructor shall not be virtual (10.3) or static (9.4). A 2815 // constructor can be invoked for a const, volatile or const 2816 // volatile object. A constructor shall not be declared const, 2817 // volatile, or const volatile (9.3.2). 2818 if (isVirtual) { 2819 if (!D.isInvalidType()) 2820 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2821 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2822 << SourceRange(D.getIdentifierLoc()); 2823 D.setInvalidType(); 2824 } 2825 if (SC == SC_Static) { 2826 if (!D.isInvalidType()) 2827 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2828 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2829 << SourceRange(D.getIdentifierLoc()); 2830 D.setInvalidType(); 2831 SC = SC_None; 2832 } 2833 2834 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2835 if (FTI.TypeQuals != 0) { 2836 if (FTI.TypeQuals & Qualifiers::Const) 2837 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2838 << "const" << SourceRange(D.getIdentifierLoc()); 2839 if (FTI.TypeQuals & Qualifiers::Volatile) 2840 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2841 << "volatile" << SourceRange(D.getIdentifierLoc()); 2842 if (FTI.TypeQuals & Qualifiers::Restrict) 2843 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2844 << "restrict" << SourceRange(D.getIdentifierLoc()); 2845 } 2846 2847 // Rebuild the function type "R" without any type qualifiers (in 2848 // case any of the errors above fired) and with "void" as the 2849 // return type, since constructors don't have return types. 2850 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2851 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2852 Proto->getNumArgs(), 2853 Proto->isVariadic(), 0, 2854 Proto->hasExceptionSpec(), 2855 Proto->hasAnyExceptionSpec(), 2856 Proto->getNumExceptions(), 2857 Proto->exception_begin(), 2858 Proto->getExtInfo()); 2859} 2860 2861/// CheckConstructor - Checks a fully-formed constructor for 2862/// well-formedness, issuing any diagnostics required. Returns true if 2863/// the constructor declarator is invalid. 2864void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2865 CXXRecordDecl *ClassDecl 2866 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2867 if (!ClassDecl) 2868 return Constructor->setInvalidDecl(); 2869 2870 // C++ [class.copy]p3: 2871 // A declaration of a constructor for a class X is ill-formed if 2872 // its first parameter is of type (optionally cv-qualified) X and 2873 // either there are no other parameters or else all other 2874 // parameters have default arguments. 2875 if (!Constructor->isInvalidDecl() && 2876 ((Constructor->getNumParams() == 1) || 2877 (Constructor->getNumParams() > 1 && 2878 Constructor->getParamDecl(1)->hasDefaultArg())) && 2879 Constructor->getTemplateSpecializationKind() 2880 != TSK_ImplicitInstantiation) { 2881 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2882 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2883 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2884 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2885 const char *ConstRef 2886 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2887 : " const &"; 2888 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2889 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2890 2891 // FIXME: Rather that making the constructor invalid, we should endeavor 2892 // to fix the type. 2893 Constructor->setInvalidDecl(); 2894 } 2895 } 2896} 2897 2898/// CheckDestructor - Checks a fully-formed destructor definition for 2899/// well-formedness, issuing any diagnostics required. Returns true 2900/// on error. 2901bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2902 CXXRecordDecl *RD = Destructor->getParent(); 2903 2904 if (Destructor->isVirtual()) { 2905 SourceLocation Loc; 2906 2907 if (!Destructor->isImplicit()) 2908 Loc = Destructor->getLocation(); 2909 else 2910 Loc = RD->getLocation(); 2911 2912 // If we have a virtual destructor, look up the deallocation function 2913 FunctionDecl *OperatorDelete = 0; 2914 DeclarationName Name = 2915 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2916 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2917 return true; 2918 2919 MarkDeclarationReferenced(Loc, OperatorDelete); 2920 2921 Destructor->setOperatorDelete(OperatorDelete); 2922 } 2923 2924 return false; 2925} 2926 2927static inline bool 2928FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2929 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2930 FTI.ArgInfo[0].Param && 2931 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 2932} 2933 2934/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2935/// the well-formednes of the destructor declarator @p D with type @p 2936/// R. If there are any errors in the declarator, this routine will 2937/// emit diagnostics and set the declarator to invalid. Even if this happens, 2938/// will be updated to reflect a well-formed type for the destructor and 2939/// returned. 2940QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2941 StorageClass& SC) { 2942 // C++ [class.dtor]p1: 2943 // [...] A typedef-name that names a class is a class-name 2944 // (7.1.3); however, a typedef-name that names a class shall not 2945 // be used as the identifier in the declarator for a destructor 2946 // declaration. 2947 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2948 if (isa<TypedefType>(DeclaratorType)) 2949 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2950 << DeclaratorType; 2951 2952 // C++ [class.dtor]p2: 2953 // A destructor is used to destroy objects of its class type. A 2954 // destructor takes no parameters, and no return type can be 2955 // specified for it (not even void). The address of a destructor 2956 // shall not be taken. A destructor shall not be static. A 2957 // destructor can be invoked for a const, volatile or const 2958 // volatile object. A destructor shall not be declared const, 2959 // volatile or const volatile (9.3.2). 2960 if (SC == SC_Static) { 2961 if (!D.isInvalidType()) 2962 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2963 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2964 << SourceRange(D.getIdentifierLoc()) 2965 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2966 2967 SC = SC_None; 2968 } 2969 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2970 // Destructors don't have return types, but the parser will 2971 // happily parse something like: 2972 // 2973 // class X { 2974 // float ~X(); 2975 // }; 2976 // 2977 // The return type will be eliminated later. 2978 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2979 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2980 << SourceRange(D.getIdentifierLoc()); 2981 } 2982 2983 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2984 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2985 if (FTI.TypeQuals & Qualifiers::Const) 2986 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2987 << "const" << SourceRange(D.getIdentifierLoc()); 2988 if (FTI.TypeQuals & Qualifiers::Volatile) 2989 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2990 << "volatile" << SourceRange(D.getIdentifierLoc()); 2991 if (FTI.TypeQuals & Qualifiers::Restrict) 2992 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2993 << "restrict" << SourceRange(D.getIdentifierLoc()); 2994 D.setInvalidType(); 2995 } 2996 2997 // Make sure we don't have any parameters. 2998 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2999 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3000 3001 // Delete the parameters. 3002 FTI.freeArgs(); 3003 D.setInvalidType(); 3004 } 3005 3006 // Make sure the destructor isn't variadic. 3007 if (FTI.isVariadic) { 3008 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3009 D.setInvalidType(); 3010 } 3011 3012 // Rebuild the function type "R" without any type qualifiers or 3013 // parameters (in case any of the errors above fired) and with 3014 // "void" as the return type, since destructors don't have return 3015 // types. 3016 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3017 if (!Proto) 3018 return QualType(); 3019 3020 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3021 Proto->hasExceptionSpec(), 3022 Proto->hasAnyExceptionSpec(), 3023 Proto->getNumExceptions(), 3024 Proto->exception_begin(), 3025 Proto->getExtInfo()); 3026} 3027 3028/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3029/// well-formednes of the conversion function declarator @p D with 3030/// type @p R. If there are any errors in the declarator, this routine 3031/// will emit diagnostics and return true. Otherwise, it will return 3032/// false. Either way, the type @p R will be updated to reflect a 3033/// well-formed type for the conversion operator. 3034void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3035 StorageClass& SC) { 3036 // C++ [class.conv.fct]p1: 3037 // Neither parameter types nor return type can be specified. The 3038 // type of a conversion function (8.3.5) is "function taking no 3039 // parameter returning conversion-type-id." 3040 if (SC == SC_Static) { 3041 if (!D.isInvalidType()) 3042 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3043 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3044 << SourceRange(D.getIdentifierLoc()); 3045 D.setInvalidType(); 3046 SC = SC_None; 3047 } 3048 3049 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3050 3051 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3052 // Conversion functions don't have return types, but the parser will 3053 // happily parse something like: 3054 // 3055 // class X { 3056 // float operator bool(); 3057 // }; 3058 // 3059 // The return type will be changed later anyway. 3060 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3061 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3062 << SourceRange(D.getIdentifierLoc()); 3063 D.setInvalidType(); 3064 } 3065 3066 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3067 3068 // Make sure we don't have any parameters. 3069 if (Proto->getNumArgs() > 0) { 3070 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3071 3072 // Delete the parameters. 3073 D.getTypeObject(0).Fun.freeArgs(); 3074 D.setInvalidType(); 3075 } else if (Proto->isVariadic()) { 3076 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3077 D.setInvalidType(); 3078 } 3079 3080 // Diagnose "&operator bool()" and other such nonsense. This 3081 // is actually a gcc extension which we don't support. 3082 if (Proto->getResultType() != ConvType) { 3083 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3084 << Proto->getResultType(); 3085 D.setInvalidType(); 3086 ConvType = Proto->getResultType(); 3087 } 3088 3089 // C++ [class.conv.fct]p4: 3090 // The conversion-type-id shall not represent a function type nor 3091 // an array type. 3092 if (ConvType->isArrayType()) { 3093 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3094 ConvType = Context.getPointerType(ConvType); 3095 D.setInvalidType(); 3096 } else if (ConvType->isFunctionType()) { 3097 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3098 ConvType = Context.getPointerType(ConvType); 3099 D.setInvalidType(); 3100 } 3101 3102 // Rebuild the function type "R" without any parameters (in case any 3103 // of the errors above fired) and with the conversion type as the 3104 // return type. 3105 if (D.isInvalidType()) { 3106 R = Context.getFunctionType(ConvType, 0, 0, false, 3107 Proto->getTypeQuals(), 3108 Proto->hasExceptionSpec(), 3109 Proto->hasAnyExceptionSpec(), 3110 Proto->getNumExceptions(), 3111 Proto->exception_begin(), 3112 Proto->getExtInfo()); 3113 } 3114 3115 // C++0x explicit conversion operators. 3116 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3117 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3118 diag::warn_explicit_conversion_functions) 3119 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3120} 3121 3122/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3123/// the declaration of the given C++ conversion function. This routine 3124/// is responsible for recording the conversion function in the C++ 3125/// class, if possible. 3126Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3127 assert(Conversion && "Expected to receive a conversion function declaration"); 3128 3129 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3130 3131 // Make sure we aren't redeclaring the conversion function. 3132 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3133 3134 // C++ [class.conv.fct]p1: 3135 // [...] A conversion function is never used to convert a 3136 // (possibly cv-qualified) object to the (possibly cv-qualified) 3137 // same object type (or a reference to it), to a (possibly 3138 // cv-qualified) base class of that type (or a reference to it), 3139 // or to (possibly cv-qualified) void. 3140 // FIXME: Suppress this warning if the conversion function ends up being a 3141 // virtual function that overrides a virtual function in a base class. 3142 QualType ClassType 3143 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3144 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3145 ConvType = ConvTypeRef->getPointeeType(); 3146 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3147 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3148 /* Suppress diagnostics for instantiations. */; 3149 else if (ConvType->isRecordType()) { 3150 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3151 if (ConvType == ClassType) 3152 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3153 << ClassType; 3154 else if (IsDerivedFrom(ClassType, ConvType)) 3155 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3156 << ClassType << ConvType; 3157 } else if (ConvType->isVoidType()) { 3158 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3159 << ClassType << ConvType; 3160 } 3161 3162 if (FunctionTemplateDecl *ConversionTemplate 3163 = Conversion->getDescribedFunctionTemplate()) 3164 return ConversionTemplate; 3165 3166 return Conversion; 3167} 3168 3169//===----------------------------------------------------------------------===// 3170// Namespace Handling 3171//===----------------------------------------------------------------------===// 3172 3173 3174 3175/// ActOnStartNamespaceDef - This is called at the start of a namespace 3176/// definition. 3177Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3178 SourceLocation InlineLoc, 3179 SourceLocation IdentLoc, 3180 IdentifierInfo *II, 3181 SourceLocation LBrace, 3182 AttributeList *AttrList) { 3183 // anonymous namespace starts at its left brace 3184 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3185 (II ? IdentLoc : LBrace) , II); 3186 Namespc->setLBracLoc(LBrace); 3187 Namespc->setInline(InlineLoc.isValid()); 3188 3189 Scope *DeclRegionScope = NamespcScope->getParent(); 3190 3191 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3192 3193 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3194 PushVisibilityAttr(attr); 3195 3196 if (II) { 3197 // C++ [namespace.def]p2: 3198 // The identifier in an original-namespace-definition shall not have been 3199 // previously defined in the declarative region in which the 3200 // original-namespace-definition appears. The identifier in an 3201 // original-namespace-definition is the name of the namespace. Subsequently 3202 // in that declarative region, it is treated as an original-namespace-name. 3203 3204 NamedDecl *PrevDecl 3205 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3206 ForRedeclaration); 3207 3208 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3209 // This is an extended namespace definition. 3210 if (Namespc->isInline() != OrigNS->isInline()) { 3211 // inline-ness must match 3212 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3213 << Namespc->isInline(); 3214 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3215 Namespc->setInvalidDecl(); 3216 // Recover by ignoring the new namespace's inline status. 3217 Namespc->setInline(OrigNS->isInline()); 3218 } 3219 3220 // Attach this namespace decl to the chain of extended namespace 3221 // definitions. 3222 OrigNS->setNextNamespace(Namespc); 3223 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3224 3225 // Remove the previous declaration from the scope. 3226 if (DeclRegionScope->isDeclScope(OrigNS)) { 3227 IdResolver.RemoveDecl(OrigNS); 3228 DeclRegionScope->RemoveDecl(OrigNS); 3229 } 3230 } else if (PrevDecl) { 3231 // This is an invalid name redefinition. 3232 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3233 << Namespc->getDeclName(); 3234 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3235 Namespc->setInvalidDecl(); 3236 // Continue on to push Namespc as current DeclContext and return it. 3237 } else if (II->isStr("std") && 3238 CurContext->getRedeclContext()->isTranslationUnit()) { 3239 // This is the first "real" definition of the namespace "std", so update 3240 // our cache of the "std" namespace to point at this definition. 3241 if (NamespaceDecl *StdNS = getStdNamespace()) { 3242 // We had already defined a dummy namespace "std". Link this new 3243 // namespace definition to the dummy namespace "std". 3244 StdNS->setNextNamespace(Namespc); 3245 StdNS->setLocation(IdentLoc); 3246 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3247 } 3248 3249 // Make our StdNamespace cache point at the first real definition of the 3250 // "std" namespace. 3251 StdNamespace = Namespc; 3252 } 3253 3254 PushOnScopeChains(Namespc, DeclRegionScope); 3255 } else { 3256 // Anonymous namespaces. 3257 assert(Namespc->isAnonymousNamespace()); 3258 3259 // Link the anonymous namespace into its parent. 3260 NamespaceDecl *PrevDecl; 3261 DeclContext *Parent = CurContext->getRedeclContext(); 3262 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3263 PrevDecl = TU->getAnonymousNamespace(); 3264 TU->setAnonymousNamespace(Namespc); 3265 } else { 3266 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3267 PrevDecl = ND->getAnonymousNamespace(); 3268 ND->setAnonymousNamespace(Namespc); 3269 } 3270 3271 // Link the anonymous namespace with its previous declaration. 3272 if (PrevDecl) { 3273 assert(PrevDecl->isAnonymousNamespace()); 3274 assert(!PrevDecl->getNextNamespace()); 3275 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3276 PrevDecl->setNextNamespace(Namespc); 3277 3278 if (Namespc->isInline() != PrevDecl->isInline()) { 3279 // inline-ness must match 3280 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3281 << Namespc->isInline(); 3282 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3283 Namespc->setInvalidDecl(); 3284 // Recover by ignoring the new namespace's inline status. 3285 Namespc->setInline(PrevDecl->isInline()); 3286 } 3287 } 3288 3289 CurContext->addDecl(Namespc); 3290 3291 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3292 // behaves as if it were replaced by 3293 // namespace unique { /* empty body */ } 3294 // using namespace unique; 3295 // namespace unique { namespace-body } 3296 // where all occurrences of 'unique' in a translation unit are 3297 // replaced by the same identifier and this identifier differs 3298 // from all other identifiers in the entire program. 3299 3300 // We just create the namespace with an empty name and then add an 3301 // implicit using declaration, just like the standard suggests. 3302 // 3303 // CodeGen enforces the "universally unique" aspect by giving all 3304 // declarations semantically contained within an anonymous 3305 // namespace internal linkage. 3306 3307 if (!PrevDecl) { 3308 UsingDirectiveDecl* UD 3309 = UsingDirectiveDecl::Create(Context, CurContext, 3310 /* 'using' */ LBrace, 3311 /* 'namespace' */ SourceLocation(), 3312 /* qualifier */ SourceRange(), 3313 /* NNS */ NULL, 3314 /* identifier */ SourceLocation(), 3315 Namespc, 3316 /* Ancestor */ CurContext); 3317 UD->setImplicit(); 3318 CurContext->addDecl(UD); 3319 } 3320 } 3321 3322 // Although we could have an invalid decl (i.e. the namespace name is a 3323 // redefinition), push it as current DeclContext and try to continue parsing. 3324 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3325 // for the namespace has the declarations that showed up in that particular 3326 // namespace definition. 3327 PushDeclContext(NamespcScope, Namespc); 3328 return Namespc; 3329} 3330 3331/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3332/// is a namespace alias, returns the namespace it points to. 3333static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3334 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3335 return AD->getNamespace(); 3336 return dyn_cast_or_null<NamespaceDecl>(D); 3337} 3338 3339/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3340/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3341void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3342 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3343 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3344 Namespc->setRBracLoc(RBrace); 3345 PopDeclContext(); 3346 if (Namespc->hasAttr<VisibilityAttr>()) 3347 PopPragmaVisibility(); 3348} 3349 3350CXXRecordDecl *Sema::getStdBadAlloc() const { 3351 return cast_or_null<CXXRecordDecl>( 3352 StdBadAlloc.get(Context.getExternalSource())); 3353} 3354 3355NamespaceDecl *Sema::getStdNamespace() const { 3356 return cast_or_null<NamespaceDecl>( 3357 StdNamespace.get(Context.getExternalSource())); 3358} 3359 3360/// \brief Retrieve the special "std" namespace, which may require us to 3361/// implicitly define the namespace. 3362NamespaceDecl *Sema::getOrCreateStdNamespace() { 3363 if (!StdNamespace) { 3364 // The "std" namespace has not yet been defined, so build one implicitly. 3365 StdNamespace = NamespaceDecl::Create(Context, 3366 Context.getTranslationUnitDecl(), 3367 SourceLocation(), 3368 &PP.getIdentifierTable().get("std")); 3369 getStdNamespace()->setImplicit(true); 3370 } 3371 3372 return getStdNamespace(); 3373} 3374 3375Decl *Sema::ActOnUsingDirective(Scope *S, 3376 SourceLocation UsingLoc, 3377 SourceLocation NamespcLoc, 3378 CXXScopeSpec &SS, 3379 SourceLocation IdentLoc, 3380 IdentifierInfo *NamespcName, 3381 AttributeList *AttrList) { 3382 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3383 assert(NamespcName && "Invalid NamespcName."); 3384 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3385 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3386 3387 UsingDirectiveDecl *UDir = 0; 3388 NestedNameSpecifier *Qualifier = 0; 3389 if (SS.isSet()) 3390 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3391 3392 // Lookup namespace name. 3393 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3394 LookupParsedName(R, S, &SS); 3395 if (R.isAmbiguous()) 3396 return 0; 3397 3398 if (R.empty()) { 3399 // Allow "using namespace std;" or "using namespace ::std;" even if 3400 // "std" hasn't been defined yet, for GCC compatibility. 3401 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3402 NamespcName->isStr("std")) { 3403 Diag(IdentLoc, diag::ext_using_undefined_std); 3404 R.addDecl(getOrCreateStdNamespace()); 3405 R.resolveKind(); 3406 } 3407 // Otherwise, attempt typo correction. 3408 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3409 CTC_NoKeywords, 0)) { 3410 if (R.getAsSingle<NamespaceDecl>() || 3411 R.getAsSingle<NamespaceAliasDecl>()) { 3412 if (DeclContext *DC = computeDeclContext(SS, false)) 3413 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3414 << NamespcName << DC << Corrected << SS.getRange() 3415 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3416 else 3417 Diag(IdentLoc, diag::err_using_directive_suggest) 3418 << NamespcName << Corrected 3419 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3420 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3421 << Corrected; 3422 3423 NamespcName = Corrected.getAsIdentifierInfo(); 3424 } else { 3425 R.clear(); 3426 R.setLookupName(NamespcName); 3427 } 3428 } 3429 } 3430 3431 if (!R.empty()) { 3432 NamedDecl *Named = R.getFoundDecl(); 3433 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3434 && "expected namespace decl"); 3435 // C++ [namespace.udir]p1: 3436 // A using-directive specifies that the names in the nominated 3437 // namespace can be used in the scope in which the 3438 // using-directive appears after the using-directive. During 3439 // unqualified name lookup (3.4.1), the names appear as if they 3440 // were declared in the nearest enclosing namespace which 3441 // contains both the using-directive and the nominated 3442 // namespace. [Note: in this context, "contains" means "contains 3443 // directly or indirectly". ] 3444 3445 // Find enclosing context containing both using-directive and 3446 // nominated namespace. 3447 NamespaceDecl *NS = getNamespaceDecl(Named); 3448 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3449 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3450 CommonAncestor = CommonAncestor->getParent(); 3451 3452 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3453 SS.getRange(), 3454 (NestedNameSpecifier *)SS.getScopeRep(), 3455 IdentLoc, Named, CommonAncestor); 3456 PushUsingDirective(S, UDir); 3457 } else { 3458 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3459 } 3460 3461 // FIXME: We ignore attributes for now. 3462 delete AttrList; 3463 return UDir; 3464} 3465 3466void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3467 // If scope has associated entity, then using directive is at namespace 3468 // or translation unit scope. We add UsingDirectiveDecls, into 3469 // it's lookup structure. 3470 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3471 Ctx->addDecl(UDir); 3472 else 3473 // Otherwise it is block-sope. using-directives will affect lookup 3474 // only to the end of scope. 3475 S->PushUsingDirective(UDir); 3476} 3477 3478 3479Decl *Sema::ActOnUsingDeclaration(Scope *S, 3480 AccessSpecifier AS, 3481 bool HasUsingKeyword, 3482 SourceLocation UsingLoc, 3483 CXXScopeSpec &SS, 3484 UnqualifiedId &Name, 3485 AttributeList *AttrList, 3486 bool IsTypeName, 3487 SourceLocation TypenameLoc) { 3488 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3489 3490 switch (Name.getKind()) { 3491 case UnqualifiedId::IK_Identifier: 3492 case UnqualifiedId::IK_OperatorFunctionId: 3493 case UnqualifiedId::IK_LiteralOperatorId: 3494 case UnqualifiedId::IK_ConversionFunctionId: 3495 break; 3496 3497 case UnqualifiedId::IK_ConstructorName: 3498 case UnqualifiedId::IK_ConstructorTemplateId: 3499 // C++0x inherited constructors. 3500 if (getLangOptions().CPlusPlus0x) break; 3501 3502 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3503 << SS.getRange(); 3504 return 0; 3505 3506 case UnqualifiedId::IK_DestructorName: 3507 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3508 << SS.getRange(); 3509 return 0; 3510 3511 case UnqualifiedId::IK_TemplateId: 3512 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3513 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3514 return 0; 3515 } 3516 3517 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3518 DeclarationName TargetName = TargetNameInfo.getName(); 3519 if (!TargetName) 3520 return 0; 3521 3522 // Warn about using declarations. 3523 // TODO: store that the declaration was written without 'using' and 3524 // talk about access decls instead of using decls in the 3525 // diagnostics. 3526 if (!HasUsingKeyword) { 3527 UsingLoc = Name.getSourceRange().getBegin(); 3528 3529 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3530 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3531 } 3532 3533 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3534 TargetNameInfo, AttrList, 3535 /* IsInstantiation */ false, 3536 IsTypeName, TypenameLoc); 3537 if (UD) 3538 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3539 3540 return UD; 3541} 3542 3543/// \brief Determine whether a using declaration considers the given 3544/// declarations as "equivalent", e.g., if they are redeclarations of 3545/// the same entity or are both typedefs of the same type. 3546static bool 3547IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3548 bool &SuppressRedeclaration) { 3549 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3550 SuppressRedeclaration = false; 3551 return true; 3552 } 3553 3554 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3555 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3556 SuppressRedeclaration = true; 3557 return Context.hasSameType(TD1->getUnderlyingType(), 3558 TD2->getUnderlyingType()); 3559 } 3560 3561 return false; 3562} 3563 3564 3565/// Determines whether to create a using shadow decl for a particular 3566/// decl, given the set of decls existing prior to this using lookup. 3567bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3568 const LookupResult &Previous) { 3569 // Diagnose finding a decl which is not from a base class of the 3570 // current class. We do this now because there are cases where this 3571 // function will silently decide not to build a shadow decl, which 3572 // will pre-empt further diagnostics. 3573 // 3574 // We don't need to do this in C++0x because we do the check once on 3575 // the qualifier. 3576 // 3577 // FIXME: diagnose the following if we care enough: 3578 // struct A { int foo; }; 3579 // struct B : A { using A::foo; }; 3580 // template <class T> struct C : A {}; 3581 // template <class T> struct D : C<T> { using B::foo; } // <--- 3582 // This is invalid (during instantiation) in C++03 because B::foo 3583 // resolves to the using decl in B, which is not a base class of D<T>. 3584 // We can't diagnose it immediately because C<T> is an unknown 3585 // specialization. The UsingShadowDecl in D<T> then points directly 3586 // to A::foo, which will look well-formed when we instantiate. 3587 // The right solution is to not collapse the shadow-decl chain. 3588 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3589 DeclContext *OrigDC = Orig->getDeclContext(); 3590 3591 // Handle enums and anonymous structs. 3592 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3593 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3594 while (OrigRec->isAnonymousStructOrUnion()) 3595 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3596 3597 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3598 if (OrigDC == CurContext) { 3599 Diag(Using->getLocation(), 3600 diag::err_using_decl_nested_name_specifier_is_current_class) 3601 << Using->getNestedNameRange(); 3602 Diag(Orig->getLocation(), diag::note_using_decl_target); 3603 return true; 3604 } 3605 3606 Diag(Using->getNestedNameRange().getBegin(), 3607 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3608 << Using->getTargetNestedNameDecl() 3609 << cast<CXXRecordDecl>(CurContext) 3610 << Using->getNestedNameRange(); 3611 Diag(Orig->getLocation(), diag::note_using_decl_target); 3612 return true; 3613 } 3614 } 3615 3616 if (Previous.empty()) return false; 3617 3618 NamedDecl *Target = Orig; 3619 if (isa<UsingShadowDecl>(Target)) 3620 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3621 3622 // If the target happens to be one of the previous declarations, we 3623 // don't have a conflict. 3624 // 3625 // FIXME: but we might be increasing its access, in which case we 3626 // should redeclare it. 3627 NamedDecl *NonTag = 0, *Tag = 0; 3628 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3629 I != E; ++I) { 3630 NamedDecl *D = (*I)->getUnderlyingDecl(); 3631 bool Result; 3632 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3633 return Result; 3634 3635 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3636 } 3637 3638 if (Target->isFunctionOrFunctionTemplate()) { 3639 FunctionDecl *FD; 3640 if (isa<FunctionTemplateDecl>(Target)) 3641 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3642 else 3643 FD = cast<FunctionDecl>(Target); 3644 3645 NamedDecl *OldDecl = 0; 3646 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3647 case Ovl_Overload: 3648 return false; 3649 3650 case Ovl_NonFunction: 3651 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3652 break; 3653 3654 // We found a decl with the exact signature. 3655 case Ovl_Match: 3656 // If we're in a record, we want to hide the target, so we 3657 // return true (without a diagnostic) to tell the caller not to 3658 // build a shadow decl. 3659 if (CurContext->isRecord()) 3660 return true; 3661 3662 // If we're not in a record, this is an error. 3663 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3664 break; 3665 } 3666 3667 Diag(Target->getLocation(), diag::note_using_decl_target); 3668 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3669 return true; 3670 } 3671 3672 // Target is not a function. 3673 3674 if (isa<TagDecl>(Target)) { 3675 // No conflict between a tag and a non-tag. 3676 if (!Tag) return false; 3677 3678 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3679 Diag(Target->getLocation(), diag::note_using_decl_target); 3680 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3681 return true; 3682 } 3683 3684 // No conflict between a tag and a non-tag. 3685 if (!NonTag) return false; 3686 3687 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3688 Diag(Target->getLocation(), diag::note_using_decl_target); 3689 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3690 return true; 3691} 3692 3693/// Builds a shadow declaration corresponding to a 'using' declaration. 3694UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3695 UsingDecl *UD, 3696 NamedDecl *Orig) { 3697 3698 // If we resolved to another shadow declaration, just coalesce them. 3699 NamedDecl *Target = Orig; 3700 if (isa<UsingShadowDecl>(Target)) { 3701 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3702 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3703 } 3704 3705 UsingShadowDecl *Shadow 3706 = UsingShadowDecl::Create(Context, CurContext, 3707 UD->getLocation(), UD, Target); 3708 UD->addShadowDecl(Shadow); 3709 3710 Shadow->setAccess(UD->getAccess()); 3711 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3712 Shadow->setInvalidDecl(); 3713 3714 if (S) 3715 PushOnScopeChains(Shadow, S); 3716 else 3717 CurContext->addDecl(Shadow); 3718 3719 3720 return Shadow; 3721} 3722 3723/// Hides a using shadow declaration. This is required by the current 3724/// using-decl implementation when a resolvable using declaration in a 3725/// class is followed by a declaration which would hide or override 3726/// one or more of the using decl's targets; for example: 3727/// 3728/// struct Base { void foo(int); }; 3729/// struct Derived : Base { 3730/// using Base::foo; 3731/// void foo(int); 3732/// }; 3733/// 3734/// The governing language is C++03 [namespace.udecl]p12: 3735/// 3736/// When a using-declaration brings names from a base class into a 3737/// derived class scope, member functions in the derived class 3738/// override and/or hide member functions with the same name and 3739/// parameter types in a base class (rather than conflicting). 3740/// 3741/// There are two ways to implement this: 3742/// (1) optimistically create shadow decls when they're not hidden 3743/// by existing declarations, or 3744/// (2) don't create any shadow decls (or at least don't make them 3745/// visible) until we've fully parsed/instantiated the class. 3746/// The problem with (1) is that we might have to retroactively remove 3747/// a shadow decl, which requires several O(n) operations because the 3748/// decl structures are (very reasonably) not designed for removal. 3749/// (2) avoids this but is very fiddly and phase-dependent. 3750void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3751 if (Shadow->getDeclName().getNameKind() == 3752 DeclarationName::CXXConversionFunctionName) 3753 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3754 3755 // Remove it from the DeclContext... 3756 Shadow->getDeclContext()->removeDecl(Shadow); 3757 3758 // ...and the scope, if applicable... 3759 if (S) { 3760 S->RemoveDecl(Shadow); 3761 IdResolver.RemoveDecl(Shadow); 3762 } 3763 3764 // ...and the using decl. 3765 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3766 3767 // TODO: complain somehow if Shadow was used. It shouldn't 3768 // be possible for this to happen, because...? 3769} 3770 3771/// Builds a using declaration. 3772/// 3773/// \param IsInstantiation - Whether this call arises from an 3774/// instantiation of an unresolved using declaration. We treat 3775/// the lookup differently for these declarations. 3776NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3777 SourceLocation UsingLoc, 3778 CXXScopeSpec &SS, 3779 const DeclarationNameInfo &NameInfo, 3780 AttributeList *AttrList, 3781 bool IsInstantiation, 3782 bool IsTypeName, 3783 SourceLocation TypenameLoc) { 3784 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3785 SourceLocation IdentLoc = NameInfo.getLoc(); 3786 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3787 3788 // FIXME: We ignore attributes for now. 3789 delete AttrList; 3790 3791 if (SS.isEmpty()) { 3792 Diag(IdentLoc, diag::err_using_requires_qualname); 3793 return 0; 3794 } 3795 3796 // Do the redeclaration lookup in the current scope. 3797 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3798 ForRedeclaration); 3799 Previous.setHideTags(false); 3800 if (S) { 3801 LookupName(Previous, S); 3802 3803 // It is really dumb that we have to do this. 3804 LookupResult::Filter F = Previous.makeFilter(); 3805 while (F.hasNext()) { 3806 NamedDecl *D = F.next(); 3807 if (!isDeclInScope(D, CurContext, S)) 3808 F.erase(); 3809 } 3810 F.done(); 3811 } else { 3812 assert(IsInstantiation && "no scope in non-instantiation"); 3813 assert(CurContext->isRecord() && "scope not record in instantiation"); 3814 LookupQualifiedName(Previous, CurContext); 3815 } 3816 3817 NestedNameSpecifier *NNS = 3818 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3819 3820 // Check for invalid redeclarations. 3821 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3822 return 0; 3823 3824 // Check for bad qualifiers. 3825 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3826 return 0; 3827 3828 DeclContext *LookupContext = computeDeclContext(SS); 3829 NamedDecl *D; 3830 if (!LookupContext) { 3831 if (IsTypeName) { 3832 // FIXME: not all declaration name kinds are legal here 3833 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3834 UsingLoc, TypenameLoc, 3835 SS.getRange(), NNS, 3836 IdentLoc, NameInfo.getName()); 3837 } else { 3838 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3839 UsingLoc, SS.getRange(), 3840 NNS, NameInfo); 3841 } 3842 } else { 3843 D = UsingDecl::Create(Context, CurContext, 3844 SS.getRange(), UsingLoc, NNS, NameInfo, 3845 IsTypeName); 3846 } 3847 D->setAccess(AS); 3848 CurContext->addDecl(D); 3849 3850 if (!LookupContext) return D; 3851 UsingDecl *UD = cast<UsingDecl>(D); 3852 3853 if (RequireCompleteDeclContext(SS, LookupContext)) { 3854 UD->setInvalidDecl(); 3855 return UD; 3856 } 3857 3858 // Look up the target name. 3859 3860 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3861 3862 // Unlike most lookups, we don't always want to hide tag 3863 // declarations: tag names are visible through the using declaration 3864 // even if hidden by ordinary names, *except* in a dependent context 3865 // where it's important for the sanity of two-phase lookup. 3866 if (!IsInstantiation) 3867 R.setHideTags(false); 3868 3869 LookupQualifiedName(R, LookupContext); 3870 3871 if (R.empty()) { 3872 Diag(IdentLoc, diag::err_no_member) 3873 << NameInfo.getName() << LookupContext << SS.getRange(); 3874 UD->setInvalidDecl(); 3875 return UD; 3876 } 3877 3878 if (R.isAmbiguous()) { 3879 UD->setInvalidDecl(); 3880 return UD; 3881 } 3882 3883 if (IsTypeName) { 3884 // If we asked for a typename and got a non-type decl, error out. 3885 if (!R.getAsSingle<TypeDecl>()) { 3886 Diag(IdentLoc, diag::err_using_typename_non_type); 3887 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3888 Diag((*I)->getUnderlyingDecl()->getLocation(), 3889 diag::note_using_decl_target); 3890 UD->setInvalidDecl(); 3891 return UD; 3892 } 3893 } else { 3894 // If we asked for a non-typename and we got a type, error out, 3895 // but only if this is an instantiation of an unresolved using 3896 // decl. Otherwise just silently find the type name. 3897 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3898 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3899 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3900 UD->setInvalidDecl(); 3901 return UD; 3902 } 3903 } 3904 3905 // C++0x N2914 [namespace.udecl]p6: 3906 // A using-declaration shall not name a namespace. 3907 if (R.getAsSingle<NamespaceDecl>()) { 3908 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3909 << SS.getRange(); 3910 UD->setInvalidDecl(); 3911 return UD; 3912 } 3913 3914 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3915 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3916 BuildUsingShadowDecl(S, UD, *I); 3917 } 3918 3919 return UD; 3920} 3921 3922/// Checks that the given using declaration is not an invalid 3923/// redeclaration. Note that this is checking only for the using decl 3924/// itself, not for any ill-formedness among the UsingShadowDecls. 3925bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3926 bool isTypeName, 3927 const CXXScopeSpec &SS, 3928 SourceLocation NameLoc, 3929 const LookupResult &Prev) { 3930 // C++03 [namespace.udecl]p8: 3931 // C++0x [namespace.udecl]p10: 3932 // A using-declaration is a declaration and can therefore be used 3933 // repeatedly where (and only where) multiple declarations are 3934 // allowed. 3935 // 3936 // That's in non-member contexts. 3937 if (!CurContext->getRedeclContext()->isRecord()) 3938 return false; 3939 3940 NestedNameSpecifier *Qual 3941 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3942 3943 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3944 NamedDecl *D = *I; 3945 3946 bool DTypename; 3947 NestedNameSpecifier *DQual; 3948 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3949 DTypename = UD->isTypeName(); 3950 DQual = UD->getTargetNestedNameDecl(); 3951 } else if (UnresolvedUsingValueDecl *UD 3952 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3953 DTypename = false; 3954 DQual = UD->getTargetNestedNameSpecifier(); 3955 } else if (UnresolvedUsingTypenameDecl *UD 3956 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3957 DTypename = true; 3958 DQual = UD->getTargetNestedNameSpecifier(); 3959 } else continue; 3960 3961 // using decls differ if one says 'typename' and the other doesn't. 3962 // FIXME: non-dependent using decls? 3963 if (isTypeName != DTypename) continue; 3964 3965 // using decls differ if they name different scopes (but note that 3966 // template instantiation can cause this check to trigger when it 3967 // didn't before instantiation). 3968 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3969 Context.getCanonicalNestedNameSpecifier(DQual)) 3970 continue; 3971 3972 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3973 Diag(D->getLocation(), diag::note_using_decl) << 1; 3974 return true; 3975 } 3976 3977 return false; 3978} 3979 3980 3981/// Checks that the given nested-name qualifier used in a using decl 3982/// in the current context is appropriately related to the current 3983/// scope. If an error is found, diagnoses it and returns true. 3984bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3985 const CXXScopeSpec &SS, 3986 SourceLocation NameLoc) { 3987 DeclContext *NamedContext = computeDeclContext(SS); 3988 3989 if (!CurContext->isRecord()) { 3990 // C++03 [namespace.udecl]p3: 3991 // C++0x [namespace.udecl]p8: 3992 // A using-declaration for a class member shall be a member-declaration. 3993 3994 // If we weren't able to compute a valid scope, it must be a 3995 // dependent class scope. 3996 if (!NamedContext || NamedContext->isRecord()) { 3997 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3998 << SS.getRange(); 3999 return true; 4000 } 4001 4002 // Otherwise, everything is known to be fine. 4003 return false; 4004 } 4005 4006 // The current scope is a record. 4007 4008 // If the named context is dependent, we can't decide much. 4009 if (!NamedContext) { 4010 // FIXME: in C++0x, we can diagnose if we can prove that the 4011 // nested-name-specifier does not refer to a base class, which is 4012 // still possible in some cases. 4013 4014 // Otherwise we have to conservatively report that things might be 4015 // okay. 4016 return false; 4017 } 4018 4019 if (!NamedContext->isRecord()) { 4020 // Ideally this would point at the last name in the specifier, 4021 // but we don't have that level of source info. 4022 Diag(SS.getRange().getBegin(), 4023 diag::err_using_decl_nested_name_specifier_is_not_class) 4024 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4025 return true; 4026 } 4027 4028 if (getLangOptions().CPlusPlus0x) { 4029 // C++0x [namespace.udecl]p3: 4030 // In a using-declaration used as a member-declaration, the 4031 // nested-name-specifier shall name a base class of the class 4032 // being defined. 4033 4034 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4035 cast<CXXRecordDecl>(NamedContext))) { 4036 if (CurContext == NamedContext) { 4037 Diag(NameLoc, 4038 diag::err_using_decl_nested_name_specifier_is_current_class) 4039 << SS.getRange(); 4040 return true; 4041 } 4042 4043 Diag(SS.getRange().getBegin(), 4044 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4045 << (NestedNameSpecifier*) SS.getScopeRep() 4046 << cast<CXXRecordDecl>(CurContext) 4047 << SS.getRange(); 4048 return true; 4049 } 4050 4051 return false; 4052 } 4053 4054 // C++03 [namespace.udecl]p4: 4055 // A using-declaration used as a member-declaration shall refer 4056 // to a member of a base class of the class being defined [etc.]. 4057 4058 // Salient point: SS doesn't have to name a base class as long as 4059 // lookup only finds members from base classes. Therefore we can 4060 // diagnose here only if we can prove that that can't happen, 4061 // i.e. if the class hierarchies provably don't intersect. 4062 4063 // TODO: it would be nice if "definitely valid" results were cached 4064 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4065 // need to be repeated. 4066 4067 struct UserData { 4068 llvm::DenseSet<const CXXRecordDecl*> Bases; 4069 4070 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4071 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4072 Data->Bases.insert(Base); 4073 return true; 4074 } 4075 4076 bool hasDependentBases(const CXXRecordDecl *Class) { 4077 return !Class->forallBases(collect, this); 4078 } 4079 4080 /// Returns true if the base is dependent or is one of the 4081 /// accumulated base classes. 4082 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4083 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4084 return !Data->Bases.count(Base); 4085 } 4086 4087 bool mightShareBases(const CXXRecordDecl *Class) { 4088 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4089 } 4090 }; 4091 4092 UserData Data; 4093 4094 // Returns false if we find a dependent base. 4095 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4096 return false; 4097 4098 // Returns false if the class has a dependent base or if it or one 4099 // of its bases is present in the base set of the current context. 4100 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4101 return false; 4102 4103 Diag(SS.getRange().getBegin(), 4104 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4105 << (NestedNameSpecifier*) SS.getScopeRep() 4106 << cast<CXXRecordDecl>(CurContext) 4107 << SS.getRange(); 4108 4109 return true; 4110} 4111 4112Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4113 SourceLocation NamespaceLoc, 4114 SourceLocation AliasLoc, 4115 IdentifierInfo *Alias, 4116 CXXScopeSpec &SS, 4117 SourceLocation IdentLoc, 4118 IdentifierInfo *Ident) { 4119 4120 // Lookup the namespace name. 4121 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4122 LookupParsedName(R, S, &SS); 4123 4124 // Check if we have a previous declaration with the same name. 4125 NamedDecl *PrevDecl 4126 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4127 ForRedeclaration); 4128 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4129 PrevDecl = 0; 4130 4131 if (PrevDecl) { 4132 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4133 // We already have an alias with the same name that points to the same 4134 // namespace, so don't create a new one. 4135 // FIXME: At some point, we'll want to create the (redundant) 4136 // declaration to maintain better source information. 4137 if (!R.isAmbiguous() && !R.empty() && 4138 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4139 return 0; 4140 } 4141 4142 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4143 diag::err_redefinition_different_kind; 4144 Diag(AliasLoc, DiagID) << Alias; 4145 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4146 return 0; 4147 } 4148 4149 if (R.isAmbiguous()) 4150 return 0; 4151 4152 if (R.empty()) { 4153 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4154 CTC_NoKeywords, 0)) { 4155 if (R.getAsSingle<NamespaceDecl>() || 4156 R.getAsSingle<NamespaceAliasDecl>()) { 4157 if (DeclContext *DC = computeDeclContext(SS, false)) 4158 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4159 << Ident << DC << Corrected << SS.getRange() 4160 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4161 else 4162 Diag(IdentLoc, diag::err_using_directive_suggest) 4163 << Ident << Corrected 4164 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4165 4166 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4167 << Corrected; 4168 4169 Ident = Corrected.getAsIdentifierInfo(); 4170 } else { 4171 R.clear(); 4172 R.setLookupName(Ident); 4173 } 4174 } 4175 4176 if (R.empty()) { 4177 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4178 return 0; 4179 } 4180 } 4181 4182 NamespaceAliasDecl *AliasDecl = 4183 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4184 Alias, SS.getRange(), 4185 (NestedNameSpecifier *)SS.getScopeRep(), 4186 IdentLoc, R.getFoundDecl()); 4187 4188 PushOnScopeChains(AliasDecl, S); 4189 return AliasDecl; 4190} 4191 4192namespace { 4193 /// \brief Scoped object used to handle the state changes required in Sema 4194 /// to implicitly define the body of a C++ member function; 4195 class ImplicitlyDefinedFunctionScope { 4196 Sema &S; 4197 DeclContext *PreviousContext; 4198 4199 public: 4200 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4201 : S(S), PreviousContext(S.CurContext) 4202 { 4203 S.CurContext = Method; 4204 S.PushFunctionScope(); 4205 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4206 } 4207 4208 ~ImplicitlyDefinedFunctionScope() { 4209 S.PopExpressionEvaluationContext(); 4210 S.PopFunctionOrBlockScope(); 4211 S.CurContext = PreviousContext; 4212 } 4213 }; 4214} 4215 4216static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4217 CXXRecordDecl *D) { 4218 ASTContext &Context = Self.Context; 4219 QualType ClassType = Context.getTypeDeclType(D); 4220 DeclarationName ConstructorName 4221 = Context.DeclarationNames.getCXXConstructorName( 4222 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4223 4224 DeclContext::lookup_const_iterator Con, ConEnd; 4225 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4226 Con != ConEnd; ++Con) { 4227 // FIXME: In C++0x, a constructor template can be a default constructor. 4228 if (isa<FunctionTemplateDecl>(*Con)) 4229 continue; 4230 4231 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4232 if (Constructor->isDefaultConstructor()) 4233 return Constructor; 4234 } 4235 return 0; 4236} 4237 4238CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4239 CXXRecordDecl *ClassDecl) { 4240 // C++ [class.ctor]p5: 4241 // A default constructor for a class X is a constructor of class X 4242 // that can be called without an argument. If there is no 4243 // user-declared constructor for class X, a default constructor is 4244 // implicitly declared. An implicitly-declared default constructor 4245 // is an inline public member of its class. 4246 assert(!ClassDecl->hasUserDeclaredConstructor() && 4247 "Should not build implicit default constructor!"); 4248 4249 // C++ [except.spec]p14: 4250 // An implicitly declared special member function (Clause 12) shall have an 4251 // exception-specification. [...] 4252 ImplicitExceptionSpecification ExceptSpec(Context); 4253 4254 // Direct base-class destructors. 4255 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4256 BEnd = ClassDecl->bases_end(); 4257 B != BEnd; ++B) { 4258 if (B->isVirtual()) // Handled below. 4259 continue; 4260 4261 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4262 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4263 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4264 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4265 else if (CXXConstructorDecl *Constructor 4266 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4267 ExceptSpec.CalledDecl(Constructor); 4268 } 4269 } 4270 4271 // Virtual base-class destructors. 4272 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4273 BEnd = ClassDecl->vbases_end(); 4274 B != BEnd; ++B) { 4275 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4276 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4277 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4278 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4279 else if (CXXConstructorDecl *Constructor 4280 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4281 ExceptSpec.CalledDecl(Constructor); 4282 } 4283 } 4284 4285 // Field destructors. 4286 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4287 FEnd = ClassDecl->field_end(); 4288 F != FEnd; ++F) { 4289 if (const RecordType *RecordTy 4290 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4291 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4292 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4293 ExceptSpec.CalledDecl( 4294 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4295 else if (CXXConstructorDecl *Constructor 4296 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4297 ExceptSpec.CalledDecl(Constructor); 4298 } 4299 } 4300 4301 4302 // Create the actual constructor declaration. 4303 CanQualType ClassType 4304 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4305 DeclarationName Name 4306 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4307 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4308 CXXConstructorDecl *DefaultCon 4309 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4310 Context.getFunctionType(Context.VoidTy, 4311 0, 0, false, 0, 4312 ExceptSpec.hasExceptionSpecification(), 4313 ExceptSpec.hasAnyExceptionSpecification(), 4314 ExceptSpec.size(), 4315 ExceptSpec.data(), 4316 FunctionType::ExtInfo()), 4317 /*TInfo=*/0, 4318 /*isExplicit=*/false, 4319 /*isInline=*/true, 4320 /*isImplicitlyDeclared=*/true); 4321 DefaultCon->setAccess(AS_public); 4322 DefaultCon->setImplicit(); 4323 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4324 4325 // Note that we have declared this constructor. 4326 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4327 4328 if (Scope *S = getScopeForContext(ClassDecl)) 4329 PushOnScopeChains(DefaultCon, S, false); 4330 ClassDecl->addDecl(DefaultCon); 4331 4332 return DefaultCon; 4333} 4334 4335void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4336 CXXConstructorDecl *Constructor) { 4337 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4338 !Constructor->isUsed(false)) && 4339 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4340 4341 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4342 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4343 4344 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4345 ErrorTrap Trap(*this); 4346 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4347 Trap.hasErrorOccurred()) { 4348 Diag(CurrentLocation, diag::note_member_synthesized_at) 4349 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4350 Constructor->setInvalidDecl(); 4351 return; 4352 } 4353 4354 SourceLocation Loc = Constructor->getLocation(); 4355 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4356 4357 Constructor->setUsed(); 4358 MarkVTableUsed(CurrentLocation, ClassDecl); 4359} 4360 4361CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4362 // C++ [class.dtor]p2: 4363 // If a class has no user-declared destructor, a destructor is 4364 // declared implicitly. An implicitly-declared destructor is an 4365 // inline public member of its class. 4366 4367 // C++ [except.spec]p14: 4368 // An implicitly declared special member function (Clause 12) shall have 4369 // an exception-specification. 4370 ImplicitExceptionSpecification ExceptSpec(Context); 4371 4372 // Direct base-class destructors. 4373 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4374 BEnd = ClassDecl->bases_end(); 4375 B != BEnd; ++B) { 4376 if (B->isVirtual()) // Handled below. 4377 continue; 4378 4379 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4380 ExceptSpec.CalledDecl( 4381 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4382 } 4383 4384 // Virtual base-class destructors. 4385 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4386 BEnd = ClassDecl->vbases_end(); 4387 B != BEnd; ++B) { 4388 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4389 ExceptSpec.CalledDecl( 4390 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4391 } 4392 4393 // Field destructors. 4394 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4395 FEnd = ClassDecl->field_end(); 4396 F != FEnd; ++F) { 4397 if (const RecordType *RecordTy 4398 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4399 ExceptSpec.CalledDecl( 4400 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4401 } 4402 4403 // Create the actual destructor declaration. 4404 QualType Ty = Context.getFunctionType(Context.VoidTy, 4405 0, 0, false, 0, 4406 ExceptSpec.hasExceptionSpecification(), 4407 ExceptSpec.hasAnyExceptionSpecification(), 4408 ExceptSpec.size(), 4409 ExceptSpec.data(), 4410 FunctionType::ExtInfo()); 4411 4412 CanQualType ClassType 4413 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4414 DeclarationName Name 4415 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4416 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4417 CXXDestructorDecl *Destructor 4418 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4419 /*isInline=*/true, 4420 /*isImplicitlyDeclared=*/true); 4421 Destructor->setAccess(AS_public); 4422 Destructor->setImplicit(); 4423 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4424 4425 // Note that we have declared this destructor. 4426 ++ASTContext::NumImplicitDestructorsDeclared; 4427 4428 // Introduce this destructor into its scope. 4429 if (Scope *S = getScopeForContext(ClassDecl)) 4430 PushOnScopeChains(Destructor, S, false); 4431 ClassDecl->addDecl(Destructor); 4432 4433 // This could be uniqued if it ever proves significant. 4434 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4435 4436 AddOverriddenMethods(ClassDecl, Destructor); 4437 4438 return Destructor; 4439} 4440 4441void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4442 CXXDestructorDecl *Destructor) { 4443 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4444 "DefineImplicitDestructor - call it for implicit default dtor"); 4445 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4446 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4447 4448 if (Destructor->isInvalidDecl()) 4449 return; 4450 4451 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4452 4453 ErrorTrap Trap(*this); 4454 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4455 Destructor->getParent()); 4456 4457 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4458 Diag(CurrentLocation, diag::note_member_synthesized_at) 4459 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4460 4461 Destructor->setInvalidDecl(); 4462 return; 4463 } 4464 4465 SourceLocation Loc = Destructor->getLocation(); 4466 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4467 4468 Destructor->setUsed(); 4469 MarkVTableUsed(CurrentLocation, ClassDecl); 4470} 4471 4472/// \brief Builds a statement that copies the given entity from \p From to 4473/// \c To. 4474/// 4475/// This routine is used to copy the members of a class with an 4476/// implicitly-declared copy assignment operator. When the entities being 4477/// copied are arrays, this routine builds for loops to copy them. 4478/// 4479/// \param S The Sema object used for type-checking. 4480/// 4481/// \param Loc The location where the implicit copy is being generated. 4482/// 4483/// \param T The type of the expressions being copied. Both expressions must 4484/// have this type. 4485/// 4486/// \param To The expression we are copying to. 4487/// 4488/// \param From The expression we are copying from. 4489/// 4490/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4491/// Otherwise, it's a non-static member subobject. 4492/// 4493/// \param Depth Internal parameter recording the depth of the recursion. 4494/// 4495/// \returns A statement or a loop that copies the expressions. 4496static StmtResult 4497BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4498 Expr *To, Expr *From, 4499 bool CopyingBaseSubobject, unsigned Depth = 0) { 4500 // C++0x [class.copy]p30: 4501 // Each subobject is assigned in the manner appropriate to its type: 4502 // 4503 // - if the subobject is of class type, the copy assignment operator 4504 // for the class is used (as if by explicit qualification; that is, 4505 // ignoring any possible virtual overriding functions in more derived 4506 // classes); 4507 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4508 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4509 4510 // Look for operator=. 4511 DeclarationName Name 4512 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4513 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4514 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4515 4516 // Filter out any result that isn't a copy-assignment operator. 4517 LookupResult::Filter F = OpLookup.makeFilter(); 4518 while (F.hasNext()) { 4519 NamedDecl *D = F.next(); 4520 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4521 if (Method->isCopyAssignmentOperator()) 4522 continue; 4523 4524 F.erase(); 4525 } 4526 F.done(); 4527 4528 // Suppress the protected check (C++ [class.protected]) for each of the 4529 // assignment operators we found. This strange dance is required when 4530 // we're assigning via a base classes's copy-assignment operator. To 4531 // ensure that we're getting the right base class subobject (without 4532 // ambiguities), we need to cast "this" to that subobject type; to 4533 // ensure that we don't go through the virtual call mechanism, we need 4534 // to qualify the operator= name with the base class (see below). However, 4535 // this means that if the base class has a protected copy assignment 4536 // operator, the protected member access check will fail. So, we 4537 // rewrite "protected" access to "public" access in this case, since we 4538 // know by construction that we're calling from a derived class. 4539 if (CopyingBaseSubobject) { 4540 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4541 L != LEnd; ++L) { 4542 if (L.getAccess() == AS_protected) 4543 L.setAccess(AS_public); 4544 } 4545 } 4546 4547 // Create the nested-name-specifier that will be used to qualify the 4548 // reference to operator=; this is required to suppress the virtual 4549 // call mechanism. 4550 CXXScopeSpec SS; 4551 SS.setRange(Loc); 4552 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4553 T.getTypePtr())); 4554 4555 // Create the reference to operator=. 4556 ExprResult OpEqualRef 4557 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4558 /*FirstQualifierInScope=*/0, OpLookup, 4559 /*TemplateArgs=*/0, 4560 /*SuppressQualifierCheck=*/true); 4561 if (OpEqualRef.isInvalid()) 4562 return StmtError(); 4563 4564 // Build the call to the assignment operator. 4565 4566 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4567 OpEqualRef.takeAs<Expr>(), 4568 Loc, &From, 1, Loc); 4569 if (Call.isInvalid()) 4570 return StmtError(); 4571 4572 return S.Owned(Call.takeAs<Stmt>()); 4573 } 4574 4575 // - if the subobject is of scalar type, the built-in assignment 4576 // operator is used. 4577 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4578 if (!ArrayTy) { 4579 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4580 if (Assignment.isInvalid()) 4581 return StmtError(); 4582 4583 return S.Owned(Assignment.takeAs<Stmt>()); 4584 } 4585 4586 // - if the subobject is an array, each element is assigned, in the 4587 // manner appropriate to the element type; 4588 4589 // Construct a loop over the array bounds, e.g., 4590 // 4591 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4592 // 4593 // that will copy each of the array elements. 4594 QualType SizeType = S.Context.getSizeType(); 4595 4596 // Create the iteration variable. 4597 IdentifierInfo *IterationVarName = 0; 4598 { 4599 llvm::SmallString<8> Str; 4600 llvm::raw_svector_ostream OS(Str); 4601 OS << "__i" << Depth; 4602 IterationVarName = &S.Context.Idents.get(OS.str()); 4603 } 4604 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4605 IterationVarName, SizeType, 4606 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4607 SC_None, SC_None); 4608 4609 // Initialize the iteration variable to zero. 4610 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4611 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4612 4613 // Create a reference to the iteration variable; we'll use this several 4614 // times throughout. 4615 Expr *IterationVarRef 4616 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4617 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4618 4619 // Create the DeclStmt that holds the iteration variable. 4620 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4621 4622 // Create the comparison against the array bound. 4623 llvm::APInt Upper = ArrayTy->getSize(); 4624 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4625 Expr *Comparison 4626 = new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4627 IntegerLiteral::Create(S.Context, 4628 Upper, SizeType, Loc), 4629 BO_NE, S.Context.BoolTy, Loc); 4630 4631 // Create the pre-increment of the iteration variable. 4632 Expr *Increment 4633 = new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4634 UO_PreInc, 4635 SizeType, Loc); 4636 4637 // Subscript the "from" and "to" expressions with the iteration variable. 4638 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4639 IterationVarRef, Loc)); 4640 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4641 IterationVarRef, Loc)); 4642 4643 // Build the copy for an individual element of the array. 4644 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4645 ArrayTy->getElementType(), 4646 To, From, 4647 CopyingBaseSubobject, Depth+1); 4648 if (Copy.isInvalid()) 4649 return StmtError(); 4650 4651 // Construct the loop that copies all elements of this array. 4652 return S.ActOnForStmt(Loc, Loc, InitStmt, 4653 S.MakeFullExpr(Comparison), 4654 0, S.MakeFullExpr(Increment), 4655 Loc, Copy.take()); 4656} 4657 4658/// \brief Determine whether the given class has a copy assignment operator 4659/// that accepts a const-qualified argument. 4660static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4661 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4662 4663 if (!Class->hasDeclaredCopyAssignment()) 4664 S.DeclareImplicitCopyAssignment(Class); 4665 4666 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4667 DeclarationName OpName 4668 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4669 4670 DeclContext::lookup_const_iterator Op, OpEnd; 4671 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4672 // C++ [class.copy]p9: 4673 // A user-declared copy assignment operator is a non-static non-template 4674 // member function of class X with exactly one parameter of type X, X&, 4675 // const X&, volatile X& or const volatile X&. 4676 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4677 if (!Method) 4678 continue; 4679 4680 if (Method->isStatic()) 4681 continue; 4682 if (Method->getPrimaryTemplate()) 4683 continue; 4684 const FunctionProtoType *FnType = 4685 Method->getType()->getAs<FunctionProtoType>(); 4686 assert(FnType && "Overloaded operator has no prototype."); 4687 // Don't assert on this; an invalid decl might have been left in the AST. 4688 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4689 continue; 4690 bool AcceptsConst = true; 4691 QualType ArgType = FnType->getArgType(0); 4692 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4693 ArgType = Ref->getPointeeType(); 4694 // Is it a non-const lvalue reference? 4695 if (!ArgType.isConstQualified()) 4696 AcceptsConst = false; 4697 } 4698 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4699 continue; 4700 4701 // We have a single argument of type cv X or cv X&, i.e. we've found the 4702 // copy assignment operator. Return whether it accepts const arguments. 4703 return AcceptsConst; 4704 } 4705 assert(Class->isInvalidDecl() && 4706 "No copy assignment operator declared in valid code."); 4707 return false; 4708} 4709 4710CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4711 // Note: The following rules are largely analoguous to the copy 4712 // constructor rules. Note that virtual bases are not taken into account 4713 // for determining the argument type of the operator. Note also that 4714 // operators taking an object instead of a reference are allowed. 4715 4716 4717 // C++ [class.copy]p10: 4718 // If the class definition does not explicitly declare a copy 4719 // assignment operator, one is declared implicitly. 4720 // The implicitly-defined copy assignment operator for a class X 4721 // will have the form 4722 // 4723 // X& X::operator=(const X&) 4724 // 4725 // if 4726 bool HasConstCopyAssignment = true; 4727 4728 // -- each direct base class B of X has a copy assignment operator 4729 // whose parameter is of type const B&, const volatile B& or B, 4730 // and 4731 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4732 BaseEnd = ClassDecl->bases_end(); 4733 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4734 assert(!Base->getType()->isDependentType() && 4735 "Cannot generate implicit members for class with dependent bases."); 4736 const CXXRecordDecl *BaseClassDecl 4737 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4738 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4739 } 4740 4741 // -- for all the nonstatic data members of X that are of a class 4742 // type M (or array thereof), each such class type has a copy 4743 // assignment operator whose parameter is of type const M&, 4744 // const volatile M& or M. 4745 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4746 FieldEnd = ClassDecl->field_end(); 4747 HasConstCopyAssignment && Field != FieldEnd; 4748 ++Field) { 4749 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4750 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4751 const CXXRecordDecl *FieldClassDecl 4752 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4753 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4754 } 4755 } 4756 4757 // Otherwise, the implicitly declared copy assignment operator will 4758 // have the form 4759 // 4760 // X& X::operator=(X&) 4761 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4762 QualType RetType = Context.getLValueReferenceType(ArgType); 4763 if (HasConstCopyAssignment) 4764 ArgType = ArgType.withConst(); 4765 ArgType = Context.getLValueReferenceType(ArgType); 4766 4767 // C++ [except.spec]p14: 4768 // An implicitly declared special member function (Clause 12) shall have an 4769 // exception-specification. [...] 4770 ImplicitExceptionSpecification ExceptSpec(Context); 4771 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4772 BaseEnd = ClassDecl->bases_end(); 4773 Base != BaseEnd; ++Base) { 4774 CXXRecordDecl *BaseClassDecl 4775 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4776 4777 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4778 DeclareImplicitCopyAssignment(BaseClassDecl); 4779 4780 if (CXXMethodDecl *CopyAssign 4781 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4782 ExceptSpec.CalledDecl(CopyAssign); 4783 } 4784 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4785 FieldEnd = ClassDecl->field_end(); 4786 Field != FieldEnd; 4787 ++Field) { 4788 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4789 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4790 CXXRecordDecl *FieldClassDecl 4791 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4792 4793 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4794 DeclareImplicitCopyAssignment(FieldClassDecl); 4795 4796 if (CXXMethodDecl *CopyAssign 4797 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4798 ExceptSpec.CalledDecl(CopyAssign); 4799 } 4800 } 4801 4802 // An implicitly-declared copy assignment operator is an inline public 4803 // member of its class. 4804 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4805 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4806 CXXMethodDecl *CopyAssignment 4807 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4808 Context.getFunctionType(RetType, &ArgType, 1, 4809 false, 0, 4810 ExceptSpec.hasExceptionSpecification(), 4811 ExceptSpec.hasAnyExceptionSpecification(), 4812 ExceptSpec.size(), 4813 ExceptSpec.data(), 4814 FunctionType::ExtInfo()), 4815 /*TInfo=*/0, /*isStatic=*/false, 4816 /*StorageClassAsWritten=*/SC_None, 4817 /*isInline=*/true); 4818 CopyAssignment->setAccess(AS_public); 4819 CopyAssignment->setImplicit(); 4820 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4821 4822 // Add the parameter to the operator. 4823 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4824 ClassDecl->getLocation(), 4825 /*Id=*/0, 4826 ArgType, /*TInfo=*/0, 4827 SC_None, 4828 SC_None, 0); 4829 CopyAssignment->setParams(&FromParam, 1); 4830 4831 // Note that we have added this copy-assignment operator. 4832 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4833 4834 if (Scope *S = getScopeForContext(ClassDecl)) 4835 PushOnScopeChains(CopyAssignment, S, false); 4836 ClassDecl->addDecl(CopyAssignment); 4837 4838 AddOverriddenMethods(ClassDecl, CopyAssignment); 4839 return CopyAssignment; 4840} 4841 4842void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4843 CXXMethodDecl *CopyAssignOperator) { 4844 assert((CopyAssignOperator->isImplicit() && 4845 CopyAssignOperator->isOverloadedOperator() && 4846 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4847 !CopyAssignOperator->isUsed(false)) && 4848 "DefineImplicitCopyAssignment called for wrong function"); 4849 4850 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4851 4852 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4853 CopyAssignOperator->setInvalidDecl(); 4854 return; 4855 } 4856 4857 CopyAssignOperator->setUsed(); 4858 4859 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4860 ErrorTrap Trap(*this); 4861 4862 // C++0x [class.copy]p30: 4863 // The implicitly-defined or explicitly-defaulted copy assignment operator 4864 // for a non-union class X performs memberwise copy assignment of its 4865 // subobjects. The direct base classes of X are assigned first, in the 4866 // order of their declaration in the base-specifier-list, and then the 4867 // immediate non-static data members of X are assigned, in the order in 4868 // which they were declared in the class definition. 4869 4870 // The statements that form the synthesized function body. 4871 ASTOwningVector<Stmt*> Statements(*this); 4872 4873 // The parameter for the "other" object, which we are copying from. 4874 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4875 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4876 QualType OtherRefType = Other->getType(); 4877 if (const LValueReferenceType *OtherRef 4878 = OtherRefType->getAs<LValueReferenceType>()) { 4879 OtherRefType = OtherRef->getPointeeType(); 4880 OtherQuals = OtherRefType.getQualifiers(); 4881 } 4882 4883 // Our location for everything implicitly-generated. 4884 SourceLocation Loc = CopyAssignOperator->getLocation(); 4885 4886 // Construct a reference to the "other" object. We'll be using this 4887 // throughout the generated ASTs. 4888 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4889 assert(OtherRef && "Reference to parameter cannot fail!"); 4890 4891 // Construct the "this" pointer. We'll be using this throughout the generated 4892 // ASTs. 4893 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4894 assert(This && "Reference to this cannot fail!"); 4895 4896 // Assign base classes. 4897 bool Invalid = false; 4898 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4899 E = ClassDecl->bases_end(); Base != E; ++Base) { 4900 // Form the assignment: 4901 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4902 QualType BaseType = Base->getType().getUnqualifiedType(); 4903 CXXRecordDecl *BaseClassDecl = 0; 4904 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4905 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4906 else { 4907 Invalid = true; 4908 continue; 4909 } 4910 4911 CXXCastPath BasePath; 4912 BasePath.push_back(Base); 4913 4914 // Construct the "from" expression, which is an implicit cast to the 4915 // appropriately-qualified base type. 4916 Expr *From = OtherRef->Retain(); 4917 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4918 CK_UncheckedDerivedToBase, 4919 VK_LValue, &BasePath); 4920 4921 // Dereference "this". 4922 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4923 4924 // Implicitly cast "this" to the appropriately-qualified base type. 4925 Expr *ToE = To.takeAs<Expr>(); 4926 ImpCastExprToType(ToE, 4927 Context.getCVRQualifiedType(BaseType, 4928 CopyAssignOperator->getTypeQualifiers()), 4929 CK_UncheckedDerivedToBase, 4930 VK_LValue, &BasePath); 4931 To = Owned(ToE); 4932 4933 // Build the copy. 4934 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4935 To.get(), From, 4936 /*CopyingBaseSubobject=*/true); 4937 if (Copy.isInvalid()) { 4938 Diag(CurrentLocation, diag::note_member_synthesized_at) 4939 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4940 CopyAssignOperator->setInvalidDecl(); 4941 return; 4942 } 4943 4944 // Success! Record the copy. 4945 Statements.push_back(Copy.takeAs<Expr>()); 4946 } 4947 4948 // \brief Reference to the __builtin_memcpy function. 4949 Expr *BuiltinMemCpyRef = 0; 4950 // \brief Reference to the __builtin_objc_memmove_collectable function. 4951 Expr *CollectableMemCpyRef = 0; 4952 4953 // Assign non-static members. 4954 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4955 FieldEnd = ClassDecl->field_end(); 4956 Field != FieldEnd; ++Field) { 4957 // Check for members of reference type; we can't copy those. 4958 if (Field->getType()->isReferenceType()) { 4959 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4960 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4961 Diag(Field->getLocation(), diag::note_declared_at); 4962 Diag(CurrentLocation, diag::note_member_synthesized_at) 4963 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4964 Invalid = true; 4965 continue; 4966 } 4967 4968 // Check for members of const-qualified, non-class type. 4969 QualType BaseType = Context.getBaseElementType(Field->getType()); 4970 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4971 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4972 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4973 Diag(Field->getLocation(), diag::note_declared_at); 4974 Diag(CurrentLocation, diag::note_member_synthesized_at) 4975 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4976 Invalid = true; 4977 continue; 4978 } 4979 4980 QualType FieldType = Field->getType().getNonReferenceType(); 4981 if (FieldType->isIncompleteArrayType()) { 4982 assert(ClassDecl->hasFlexibleArrayMember() && 4983 "Incomplete array type is not valid"); 4984 continue; 4985 } 4986 4987 // Build references to the field in the object we're copying from and to. 4988 CXXScopeSpec SS; // Intentionally empty 4989 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4990 LookupMemberName); 4991 MemberLookup.addDecl(*Field); 4992 MemberLookup.resolveKind(); 4993 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 4994 Loc, /*IsArrow=*/false, 4995 SS, 0, MemberLookup, 0); 4996 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 4997 Loc, /*IsArrow=*/true, 4998 SS, 0, MemberLookup, 0); 4999 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5000 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5001 5002 // If the field should be copied with __builtin_memcpy rather than via 5003 // explicit assignments, do so. This optimization only applies for arrays 5004 // of scalars and arrays of class type with trivial copy-assignment 5005 // operators. 5006 if (FieldType->isArrayType() && 5007 (!BaseType->isRecordType() || 5008 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5009 ->hasTrivialCopyAssignment())) { 5010 // Compute the size of the memory buffer to be copied. 5011 QualType SizeType = Context.getSizeType(); 5012 llvm::APInt Size(Context.getTypeSize(SizeType), 5013 Context.getTypeSizeInChars(BaseType).getQuantity()); 5014 for (const ConstantArrayType *Array 5015 = Context.getAsConstantArrayType(FieldType); 5016 Array; 5017 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5018 llvm::APInt ArraySize = Array->getSize(); 5019 ArraySize.zextOrTrunc(Size.getBitWidth()); 5020 Size *= ArraySize; 5021 } 5022 5023 // Take the address of the field references for "from" and "to". 5024 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5025 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5026 5027 bool NeedsCollectableMemCpy = 5028 (BaseType->isRecordType() && 5029 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5030 5031 if (NeedsCollectableMemCpy) { 5032 if (!CollectableMemCpyRef) { 5033 // Create a reference to the __builtin_objc_memmove_collectable function. 5034 LookupResult R(*this, 5035 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5036 Loc, LookupOrdinaryName); 5037 LookupName(R, TUScope, true); 5038 5039 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5040 if (!CollectableMemCpy) { 5041 // Something went horribly wrong earlier, and we will have 5042 // complained about it. 5043 Invalid = true; 5044 continue; 5045 } 5046 5047 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5048 CollectableMemCpy->getType(), 5049 Loc, 0).takeAs<Expr>(); 5050 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5051 } 5052 } 5053 // Create a reference to the __builtin_memcpy builtin function. 5054 else if (!BuiltinMemCpyRef) { 5055 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5056 LookupOrdinaryName); 5057 LookupName(R, TUScope, true); 5058 5059 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5060 if (!BuiltinMemCpy) { 5061 // Something went horribly wrong earlier, and we will have complained 5062 // about it. 5063 Invalid = true; 5064 continue; 5065 } 5066 5067 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5068 BuiltinMemCpy->getType(), 5069 Loc, 0).takeAs<Expr>(); 5070 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5071 } 5072 5073 ASTOwningVector<Expr*> CallArgs(*this); 5074 CallArgs.push_back(To.takeAs<Expr>()); 5075 CallArgs.push_back(From.takeAs<Expr>()); 5076 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5077 ExprResult Call = ExprError(); 5078 if (NeedsCollectableMemCpy) 5079 Call = ActOnCallExpr(/*Scope=*/0, 5080 CollectableMemCpyRef, 5081 Loc, move_arg(CallArgs), 5082 Loc); 5083 else 5084 Call = ActOnCallExpr(/*Scope=*/0, 5085 BuiltinMemCpyRef, 5086 Loc, move_arg(CallArgs), 5087 Loc); 5088 5089 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5090 Statements.push_back(Call.takeAs<Expr>()); 5091 continue; 5092 } 5093 5094 // Build the copy of this field. 5095 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5096 To.get(), From.get(), 5097 /*CopyingBaseSubobject=*/false); 5098 if (Copy.isInvalid()) { 5099 Diag(CurrentLocation, diag::note_member_synthesized_at) 5100 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5101 CopyAssignOperator->setInvalidDecl(); 5102 return; 5103 } 5104 5105 // Success! Record the copy. 5106 Statements.push_back(Copy.takeAs<Stmt>()); 5107 } 5108 5109 if (!Invalid) { 5110 // Add a "return *this;" 5111 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5112 5113 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5114 if (Return.isInvalid()) 5115 Invalid = true; 5116 else { 5117 Statements.push_back(Return.takeAs<Stmt>()); 5118 5119 if (Trap.hasErrorOccurred()) { 5120 Diag(CurrentLocation, diag::note_member_synthesized_at) 5121 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5122 Invalid = true; 5123 } 5124 } 5125 } 5126 5127 if (Invalid) { 5128 CopyAssignOperator->setInvalidDecl(); 5129 return; 5130 } 5131 5132 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5133 /*isStmtExpr=*/false); 5134 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5135 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5136} 5137 5138CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5139 CXXRecordDecl *ClassDecl) { 5140 // C++ [class.copy]p4: 5141 // If the class definition does not explicitly declare a copy 5142 // constructor, one is declared implicitly. 5143 5144 // C++ [class.copy]p5: 5145 // The implicitly-declared copy constructor for a class X will 5146 // have the form 5147 // 5148 // X::X(const X&) 5149 // 5150 // if 5151 bool HasConstCopyConstructor = true; 5152 5153 // -- each direct or virtual base class B of X has a copy 5154 // constructor whose first parameter is of type const B& or 5155 // const volatile B&, and 5156 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5157 BaseEnd = ClassDecl->bases_end(); 5158 HasConstCopyConstructor && Base != BaseEnd; 5159 ++Base) { 5160 // Virtual bases are handled below. 5161 if (Base->isVirtual()) 5162 continue; 5163 5164 CXXRecordDecl *BaseClassDecl 5165 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5166 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5167 DeclareImplicitCopyConstructor(BaseClassDecl); 5168 5169 HasConstCopyConstructor 5170 = BaseClassDecl->hasConstCopyConstructor(Context); 5171 } 5172 5173 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5174 BaseEnd = ClassDecl->vbases_end(); 5175 HasConstCopyConstructor && Base != BaseEnd; 5176 ++Base) { 5177 CXXRecordDecl *BaseClassDecl 5178 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5179 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5180 DeclareImplicitCopyConstructor(BaseClassDecl); 5181 5182 HasConstCopyConstructor 5183 = BaseClassDecl->hasConstCopyConstructor(Context); 5184 } 5185 5186 // -- for all the nonstatic data members of X that are of a 5187 // class type M (or array thereof), each such class type 5188 // has a copy constructor whose first parameter is of type 5189 // const M& or const volatile M&. 5190 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5191 FieldEnd = ClassDecl->field_end(); 5192 HasConstCopyConstructor && Field != FieldEnd; 5193 ++Field) { 5194 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5195 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5196 CXXRecordDecl *FieldClassDecl 5197 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5198 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5199 DeclareImplicitCopyConstructor(FieldClassDecl); 5200 5201 HasConstCopyConstructor 5202 = FieldClassDecl->hasConstCopyConstructor(Context); 5203 } 5204 } 5205 5206 // Otherwise, the implicitly declared copy constructor will have 5207 // the form 5208 // 5209 // X::X(X&) 5210 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5211 QualType ArgType = ClassType; 5212 if (HasConstCopyConstructor) 5213 ArgType = ArgType.withConst(); 5214 ArgType = Context.getLValueReferenceType(ArgType); 5215 5216 // C++ [except.spec]p14: 5217 // An implicitly declared special member function (Clause 12) shall have an 5218 // exception-specification. [...] 5219 ImplicitExceptionSpecification ExceptSpec(Context); 5220 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5221 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5222 BaseEnd = ClassDecl->bases_end(); 5223 Base != BaseEnd; 5224 ++Base) { 5225 // Virtual bases are handled below. 5226 if (Base->isVirtual()) 5227 continue; 5228 5229 CXXRecordDecl *BaseClassDecl 5230 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5231 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5232 DeclareImplicitCopyConstructor(BaseClassDecl); 5233 5234 if (CXXConstructorDecl *CopyConstructor 5235 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5236 ExceptSpec.CalledDecl(CopyConstructor); 5237 } 5238 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5239 BaseEnd = ClassDecl->vbases_end(); 5240 Base != BaseEnd; 5241 ++Base) { 5242 CXXRecordDecl *BaseClassDecl 5243 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5244 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5245 DeclareImplicitCopyConstructor(BaseClassDecl); 5246 5247 if (CXXConstructorDecl *CopyConstructor 5248 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5249 ExceptSpec.CalledDecl(CopyConstructor); 5250 } 5251 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5252 FieldEnd = ClassDecl->field_end(); 5253 Field != FieldEnd; 5254 ++Field) { 5255 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5256 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5257 CXXRecordDecl *FieldClassDecl 5258 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5259 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5260 DeclareImplicitCopyConstructor(FieldClassDecl); 5261 5262 if (CXXConstructorDecl *CopyConstructor 5263 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5264 ExceptSpec.CalledDecl(CopyConstructor); 5265 } 5266 } 5267 5268 // An implicitly-declared copy constructor is an inline public 5269 // member of its class. 5270 DeclarationName Name 5271 = Context.DeclarationNames.getCXXConstructorName( 5272 Context.getCanonicalType(ClassType)); 5273 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5274 CXXConstructorDecl *CopyConstructor 5275 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5276 Context.getFunctionType(Context.VoidTy, 5277 &ArgType, 1, 5278 false, 0, 5279 ExceptSpec.hasExceptionSpecification(), 5280 ExceptSpec.hasAnyExceptionSpecification(), 5281 ExceptSpec.size(), 5282 ExceptSpec.data(), 5283 FunctionType::ExtInfo()), 5284 /*TInfo=*/0, 5285 /*isExplicit=*/false, 5286 /*isInline=*/true, 5287 /*isImplicitlyDeclared=*/true); 5288 CopyConstructor->setAccess(AS_public); 5289 CopyConstructor->setImplicit(); 5290 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5291 5292 // Note that we have declared this constructor. 5293 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5294 5295 // Add the parameter to the constructor. 5296 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5297 ClassDecl->getLocation(), 5298 /*IdentifierInfo=*/0, 5299 ArgType, /*TInfo=*/0, 5300 SC_None, 5301 SC_None, 0); 5302 CopyConstructor->setParams(&FromParam, 1); 5303 if (Scope *S = getScopeForContext(ClassDecl)) 5304 PushOnScopeChains(CopyConstructor, S, false); 5305 ClassDecl->addDecl(CopyConstructor); 5306 5307 return CopyConstructor; 5308} 5309 5310void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5311 CXXConstructorDecl *CopyConstructor, 5312 unsigned TypeQuals) { 5313 assert((CopyConstructor->isImplicit() && 5314 CopyConstructor->isCopyConstructor(TypeQuals) && 5315 !CopyConstructor->isUsed(false)) && 5316 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5317 5318 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5319 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5320 5321 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5322 ErrorTrap Trap(*this); 5323 5324 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5325 Trap.hasErrorOccurred()) { 5326 Diag(CurrentLocation, diag::note_member_synthesized_at) 5327 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5328 CopyConstructor->setInvalidDecl(); 5329 } else { 5330 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5331 CopyConstructor->getLocation(), 5332 MultiStmtArg(*this, 0, 0), 5333 /*isStmtExpr=*/false) 5334 .takeAs<Stmt>()); 5335 } 5336 5337 CopyConstructor->setUsed(); 5338} 5339 5340ExprResult 5341Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5342 CXXConstructorDecl *Constructor, 5343 MultiExprArg ExprArgs, 5344 bool RequiresZeroInit, 5345 unsigned ConstructKind) { 5346 bool Elidable = false; 5347 5348 // C++0x [class.copy]p34: 5349 // When certain criteria are met, an implementation is allowed to 5350 // omit the copy/move construction of a class object, even if the 5351 // copy/move constructor and/or destructor for the object have 5352 // side effects. [...] 5353 // - when a temporary class object that has not been bound to a 5354 // reference (12.2) would be copied/moved to a class object 5355 // with the same cv-unqualified type, the copy/move operation 5356 // can be omitted by constructing the temporary object 5357 // directly into the target of the omitted copy/move 5358 if (ConstructKind == CXXConstructExpr::CK_Complete && 5359 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5360 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5361 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5362 } 5363 5364 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5365 Elidable, move(ExprArgs), RequiresZeroInit, 5366 ConstructKind); 5367} 5368 5369/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5370/// including handling of its default argument expressions. 5371ExprResult 5372Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5373 CXXConstructorDecl *Constructor, bool Elidable, 5374 MultiExprArg ExprArgs, 5375 bool RequiresZeroInit, 5376 unsigned ConstructKind) { 5377 unsigned NumExprs = ExprArgs.size(); 5378 Expr **Exprs = (Expr **)ExprArgs.release(); 5379 5380 MarkDeclarationReferenced(ConstructLoc, Constructor); 5381 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5382 Constructor, Elidable, Exprs, NumExprs, 5383 RequiresZeroInit, 5384 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind))); 5385} 5386 5387bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5388 CXXConstructorDecl *Constructor, 5389 MultiExprArg Exprs) { 5390 ExprResult TempResult = 5391 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5392 move(Exprs), false, CXXConstructExpr::CK_Complete); 5393 if (TempResult.isInvalid()) 5394 return true; 5395 5396 Expr *Temp = TempResult.takeAs<Expr>(); 5397 CheckImplicitConversions(Temp, VD->getLocation()); 5398 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5399 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5400 VD->setInit(Temp); 5401 5402 return false; 5403} 5404 5405void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5406 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5407 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5408 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5409 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5410 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5411 CheckDestructorAccess(VD->getLocation(), Destructor, 5412 PDiag(diag::err_access_dtor_var) 5413 << VD->getDeclName() 5414 << VD->getType()); 5415 5416 // TODO: this should be re-enabled for static locals by !CXAAtExit 5417 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5418 Diag(VD->getLocation(), diag::warn_global_destructor); 5419 } 5420} 5421 5422/// AddCXXDirectInitializerToDecl - This action is called immediately after 5423/// ActOnDeclarator, when a C++ direct initializer is present. 5424/// e.g: "int x(1);" 5425void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5426 SourceLocation LParenLoc, 5427 MultiExprArg Exprs, 5428 SourceLocation RParenLoc) { 5429 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5430 5431 // If there is no declaration, there was an error parsing it. Just ignore 5432 // the initializer. 5433 if (RealDecl == 0) 5434 return; 5435 5436 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5437 if (!VDecl) { 5438 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5439 RealDecl->setInvalidDecl(); 5440 return; 5441 } 5442 5443 // We will represent direct-initialization similarly to copy-initialization: 5444 // int x(1); -as-> int x = 1; 5445 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5446 // 5447 // Clients that want to distinguish between the two forms, can check for 5448 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5449 // A major benefit is that clients that don't particularly care about which 5450 // exactly form was it (like the CodeGen) can handle both cases without 5451 // special case code. 5452 5453 // C++ 8.5p11: 5454 // The form of initialization (using parentheses or '=') is generally 5455 // insignificant, but does matter when the entity being initialized has a 5456 // class type. 5457 5458 if (!VDecl->getType()->isDependentType() && 5459 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5460 diag::err_typecheck_decl_incomplete_type)) { 5461 VDecl->setInvalidDecl(); 5462 return; 5463 } 5464 5465 // The variable can not have an abstract class type. 5466 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5467 diag::err_abstract_type_in_decl, 5468 AbstractVariableType)) 5469 VDecl->setInvalidDecl(); 5470 5471 const VarDecl *Def; 5472 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5473 Diag(VDecl->getLocation(), diag::err_redefinition) 5474 << VDecl->getDeclName(); 5475 Diag(Def->getLocation(), diag::note_previous_definition); 5476 VDecl->setInvalidDecl(); 5477 return; 5478 } 5479 5480 // C++ [class.static.data]p4 5481 // If a static data member is of const integral or const 5482 // enumeration type, its declaration in the class definition can 5483 // specify a constant-initializer which shall be an integral 5484 // constant expression (5.19). In that case, the member can appear 5485 // in integral constant expressions. The member shall still be 5486 // defined in a namespace scope if it is used in the program and the 5487 // namespace scope definition shall not contain an initializer. 5488 // 5489 // We already performed a redefinition check above, but for static 5490 // data members we also need to check whether there was an in-class 5491 // declaration with an initializer. 5492 const VarDecl* PrevInit = 0; 5493 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5494 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5495 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5496 return; 5497 } 5498 5499 // If either the declaration has a dependent type or if any of the 5500 // expressions is type-dependent, we represent the initialization 5501 // via a ParenListExpr for later use during template instantiation. 5502 if (VDecl->getType()->isDependentType() || 5503 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5504 // Let clients know that initialization was done with a direct initializer. 5505 VDecl->setCXXDirectInitializer(true); 5506 5507 // Store the initialization expressions as a ParenListExpr. 5508 unsigned NumExprs = Exprs.size(); 5509 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5510 (Expr **)Exprs.release(), 5511 NumExprs, RParenLoc)); 5512 return; 5513 } 5514 5515 // Capture the variable that is being initialized and the style of 5516 // initialization. 5517 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5518 5519 // FIXME: Poor source location information. 5520 InitializationKind Kind 5521 = InitializationKind::CreateDirect(VDecl->getLocation(), 5522 LParenLoc, RParenLoc); 5523 5524 InitializationSequence InitSeq(*this, Entity, Kind, 5525 Exprs.get(), Exprs.size()); 5526 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5527 if (Result.isInvalid()) { 5528 VDecl->setInvalidDecl(); 5529 return; 5530 } 5531 5532 CheckImplicitConversions(Result.get(), LParenLoc); 5533 5534 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5535 VDecl->setInit(Result.takeAs<Expr>()); 5536 VDecl->setCXXDirectInitializer(true); 5537 5538 if (!VDecl->isInvalidDecl() && 5539 !VDecl->getDeclContext()->isDependentContext() && 5540 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5541 !VDecl->getInit()->isConstantInitializer(Context, 5542 VDecl->getType()->isReferenceType())) 5543 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5544 << VDecl->getInit()->getSourceRange(); 5545 5546 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5547 FinalizeVarWithDestructor(VDecl, Record); 5548} 5549 5550/// \brief Given a constructor and the set of arguments provided for the 5551/// constructor, convert the arguments and add any required default arguments 5552/// to form a proper call to this constructor. 5553/// 5554/// \returns true if an error occurred, false otherwise. 5555bool 5556Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5557 MultiExprArg ArgsPtr, 5558 SourceLocation Loc, 5559 ASTOwningVector<Expr*> &ConvertedArgs) { 5560 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5561 unsigned NumArgs = ArgsPtr.size(); 5562 Expr **Args = (Expr **)ArgsPtr.get(); 5563 5564 const FunctionProtoType *Proto 5565 = Constructor->getType()->getAs<FunctionProtoType>(); 5566 assert(Proto && "Constructor without a prototype?"); 5567 unsigned NumArgsInProto = Proto->getNumArgs(); 5568 5569 // If too few arguments are available, we'll fill in the rest with defaults. 5570 if (NumArgs < NumArgsInProto) 5571 ConvertedArgs.reserve(NumArgsInProto); 5572 else 5573 ConvertedArgs.reserve(NumArgs); 5574 5575 VariadicCallType CallType = 5576 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5577 llvm::SmallVector<Expr *, 8> AllArgs; 5578 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5579 Proto, 0, Args, NumArgs, AllArgs, 5580 CallType); 5581 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5582 ConvertedArgs.push_back(AllArgs[i]); 5583 return Invalid; 5584} 5585 5586static inline bool 5587CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5588 const FunctionDecl *FnDecl) { 5589 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5590 if (isa<NamespaceDecl>(DC)) { 5591 return SemaRef.Diag(FnDecl->getLocation(), 5592 diag::err_operator_new_delete_declared_in_namespace) 5593 << FnDecl->getDeclName(); 5594 } 5595 5596 if (isa<TranslationUnitDecl>(DC) && 5597 FnDecl->getStorageClass() == SC_Static) { 5598 return SemaRef.Diag(FnDecl->getLocation(), 5599 diag::err_operator_new_delete_declared_static) 5600 << FnDecl->getDeclName(); 5601 } 5602 5603 return false; 5604} 5605 5606static inline bool 5607CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5608 CanQualType ExpectedResultType, 5609 CanQualType ExpectedFirstParamType, 5610 unsigned DependentParamTypeDiag, 5611 unsigned InvalidParamTypeDiag) { 5612 QualType ResultType = 5613 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5614 5615 // Check that the result type is not dependent. 5616 if (ResultType->isDependentType()) 5617 return SemaRef.Diag(FnDecl->getLocation(), 5618 diag::err_operator_new_delete_dependent_result_type) 5619 << FnDecl->getDeclName() << ExpectedResultType; 5620 5621 // Check that the result type is what we expect. 5622 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5623 return SemaRef.Diag(FnDecl->getLocation(), 5624 diag::err_operator_new_delete_invalid_result_type) 5625 << FnDecl->getDeclName() << ExpectedResultType; 5626 5627 // A function template must have at least 2 parameters. 5628 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5629 return SemaRef.Diag(FnDecl->getLocation(), 5630 diag::err_operator_new_delete_template_too_few_parameters) 5631 << FnDecl->getDeclName(); 5632 5633 // The function decl must have at least 1 parameter. 5634 if (FnDecl->getNumParams() == 0) 5635 return SemaRef.Diag(FnDecl->getLocation(), 5636 diag::err_operator_new_delete_too_few_parameters) 5637 << FnDecl->getDeclName(); 5638 5639 // Check the the first parameter type is not dependent. 5640 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5641 if (FirstParamType->isDependentType()) 5642 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5643 << FnDecl->getDeclName() << ExpectedFirstParamType; 5644 5645 // Check that the first parameter type is what we expect. 5646 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5647 ExpectedFirstParamType) 5648 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5649 << FnDecl->getDeclName() << ExpectedFirstParamType; 5650 5651 return false; 5652} 5653 5654static bool 5655CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5656 // C++ [basic.stc.dynamic.allocation]p1: 5657 // A program is ill-formed if an allocation function is declared in a 5658 // namespace scope other than global scope or declared static in global 5659 // scope. 5660 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5661 return true; 5662 5663 CanQualType SizeTy = 5664 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5665 5666 // C++ [basic.stc.dynamic.allocation]p1: 5667 // The return type shall be void*. The first parameter shall have type 5668 // std::size_t. 5669 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5670 SizeTy, 5671 diag::err_operator_new_dependent_param_type, 5672 diag::err_operator_new_param_type)) 5673 return true; 5674 5675 // C++ [basic.stc.dynamic.allocation]p1: 5676 // The first parameter shall not have an associated default argument. 5677 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5678 return SemaRef.Diag(FnDecl->getLocation(), 5679 diag::err_operator_new_default_arg) 5680 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5681 5682 return false; 5683} 5684 5685static bool 5686CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5687 // C++ [basic.stc.dynamic.deallocation]p1: 5688 // A program is ill-formed if deallocation functions are declared in a 5689 // namespace scope other than global scope or declared static in global 5690 // scope. 5691 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5692 return true; 5693 5694 // C++ [basic.stc.dynamic.deallocation]p2: 5695 // Each deallocation function shall return void and its first parameter 5696 // shall be void*. 5697 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5698 SemaRef.Context.VoidPtrTy, 5699 diag::err_operator_delete_dependent_param_type, 5700 diag::err_operator_delete_param_type)) 5701 return true; 5702 5703 return false; 5704} 5705 5706/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5707/// of this overloaded operator is well-formed. If so, returns false; 5708/// otherwise, emits appropriate diagnostics and returns true. 5709bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5710 assert(FnDecl && FnDecl->isOverloadedOperator() && 5711 "Expected an overloaded operator declaration"); 5712 5713 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5714 5715 // C++ [over.oper]p5: 5716 // The allocation and deallocation functions, operator new, 5717 // operator new[], operator delete and operator delete[], are 5718 // described completely in 3.7.3. The attributes and restrictions 5719 // found in the rest of this subclause do not apply to them unless 5720 // explicitly stated in 3.7.3. 5721 if (Op == OO_Delete || Op == OO_Array_Delete) 5722 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5723 5724 if (Op == OO_New || Op == OO_Array_New) 5725 return CheckOperatorNewDeclaration(*this, FnDecl); 5726 5727 // C++ [over.oper]p6: 5728 // An operator function shall either be a non-static member 5729 // function or be a non-member function and have at least one 5730 // parameter whose type is a class, a reference to a class, an 5731 // enumeration, or a reference to an enumeration. 5732 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5733 if (MethodDecl->isStatic()) 5734 return Diag(FnDecl->getLocation(), 5735 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5736 } else { 5737 bool ClassOrEnumParam = false; 5738 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5739 ParamEnd = FnDecl->param_end(); 5740 Param != ParamEnd; ++Param) { 5741 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5742 if (ParamType->isDependentType() || ParamType->isRecordType() || 5743 ParamType->isEnumeralType()) { 5744 ClassOrEnumParam = true; 5745 break; 5746 } 5747 } 5748 5749 if (!ClassOrEnumParam) 5750 return Diag(FnDecl->getLocation(), 5751 diag::err_operator_overload_needs_class_or_enum) 5752 << FnDecl->getDeclName(); 5753 } 5754 5755 // C++ [over.oper]p8: 5756 // An operator function cannot have default arguments (8.3.6), 5757 // except where explicitly stated below. 5758 // 5759 // Only the function-call operator allows default arguments 5760 // (C++ [over.call]p1). 5761 if (Op != OO_Call) { 5762 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5763 Param != FnDecl->param_end(); ++Param) { 5764 if ((*Param)->hasDefaultArg()) 5765 return Diag((*Param)->getLocation(), 5766 diag::err_operator_overload_default_arg) 5767 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5768 } 5769 } 5770 5771 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5772 { false, false, false } 5773#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5774 , { Unary, Binary, MemberOnly } 5775#include "clang/Basic/OperatorKinds.def" 5776 }; 5777 5778 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5779 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5780 bool MustBeMemberOperator = OperatorUses[Op][2]; 5781 5782 // C++ [over.oper]p8: 5783 // [...] Operator functions cannot have more or fewer parameters 5784 // than the number required for the corresponding operator, as 5785 // described in the rest of this subclause. 5786 unsigned NumParams = FnDecl->getNumParams() 5787 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5788 if (Op != OO_Call && 5789 ((NumParams == 1 && !CanBeUnaryOperator) || 5790 (NumParams == 2 && !CanBeBinaryOperator) || 5791 (NumParams < 1) || (NumParams > 2))) { 5792 // We have the wrong number of parameters. 5793 unsigned ErrorKind; 5794 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5795 ErrorKind = 2; // 2 -> unary or binary. 5796 } else if (CanBeUnaryOperator) { 5797 ErrorKind = 0; // 0 -> unary 5798 } else { 5799 assert(CanBeBinaryOperator && 5800 "All non-call overloaded operators are unary or binary!"); 5801 ErrorKind = 1; // 1 -> binary 5802 } 5803 5804 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5805 << FnDecl->getDeclName() << NumParams << ErrorKind; 5806 } 5807 5808 // Overloaded operators other than operator() cannot be variadic. 5809 if (Op != OO_Call && 5810 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5811 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5812 << FnDecl->getDeclName(); 5813 } 5814 5815 // Some operators must be non-static member functions. 5816 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5817 return Diag(FnDecl->getLocation(), 5818 diag::err_operator_overload_must_be_member) 5819 << FnDecl->getDeclName(); 5820 } 5821 5822 // C++ [over.inc]p1: 5823 // The user-defined function called operator++ implements the 5824 // prefix and postfix ++ operator. If this function is a member 5825 // function with no parameters, or a non-member function with one 5826 // parameter of class or enumeration type, it defines the prefix 5827 // increment operator ++ for objects of that type. If the function 5828 // is a member function with one parameter (which shall be of type 5829 // int) or a non-member function with two parameters (the second 5830 // of which shall be of type int), it defines the postfix 5831 // increment operator ++ for objects of that type. 5832 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5833 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5834 bool ParamIsInt = false; 5835 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5836 ParamIsInt = BT->getKind() == BuiltinType::Int; 5837 5838 if (!ParamIsInt) 5839 return Diag(LastParam->getLocation(), 5840 diag::err_operator_overload_post_incdec_must_be_int) 5841 << LastParam->getType() << (Op == OO_MinusMinus); 5842 } 5843 5844 return false; 5845} 5846 5847/// CheckLiteralOperatorDeclaration - Check whether the declaration 5848/// of this literal operator function is well-formed. If so, returns 5849/// false; otherwise, emits appropriate diagnostics and returns true. 5850bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5851 DeclContext *DC = FnDecl->getDeclContext(); 5852 Decl::Kind Kind = DC->getDeclKind(); 5853 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5854 Kind != Decl::LinkageSpec) { 5855 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5856 << FnDecl->getDeclName(); 5857 return true; 5858 } 5859 5860 bool Valid = false; 5861 5862 // template <char...> type operator "" name() is the only valid template 5863 // signature, and the only valid signature with no parameters. 5864 if (FnDecl->param_size() == 0) { 5865 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5866 // Must have only one template parameter 5867 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5868 if (Params->size() == 1) { 5869 NonTypeTemplateParmDecl *PmDecl = 5870 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5871 5872 // The template parameter must be a char parameter pack. 5873 // FIXME: This test will always fail because non-type parameter packs 5874 // have not been implemented. 5875 if (PmDecl && PmDecl->isTemplateParameterPack() && 5876 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5877 Valid = true; 5878 } 5879 } 5880 } else { 5881 // Check the first parameter 5882 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5883 5884 QualType T = (*Param)->getType(); 5885 5886 // unsigned long long int, long double, and any character type are allowed 5887 // as the only parameters. 5888 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5889 Context.hasSameType(T, Context.LongDoubleTy) || 5890 Context.hasSameType(T, Context.CharTy) || 5891 Context.hasSameType(T, Context.WCharTy) || 5892 Context.hasSameType(T, Context.Char16Ty) || 5893 Context.hasSameType(T, Context.Char32Ty)) { 5894 if (++Param == FnDecl->param_end()) 5895 Valid = true; 5896 goto FinishedParams; 5897 } 5898 5899 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5900 const PointerType *PT = T->getAs<PointerType>(); 5901 if (!PT) 5902 goto FinishedParams; 5903 T = PT->getPointeeType(); 5904 if (!T.isConstQualified()) 5905 goto FinishedParams; 5906 T = T.getUnqualifiedType(); 5907 5908 // Move on to the second parameter; 5909 ++Param; 5910 5911 // If there is no second parameter, the first must be a const char * 5912 if (Param == FnDecl->param_end()) { 5913 if (Context.hasSameType(T, Context.CharTy)) 5914 Valid = true; 5915 goto FinishedParams; 5916 } 5917 5918 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5919 // are allowed as the first parameter to a two-parameter function 5920 if (!(Context.hasSameType(T, Context.CharTy) || 5921 Context.hasSameType(T, Context.WCharTy) || 5922 Context.hasSameType(T, Context.Char16Ty) || 5923 Context.hasSameType(T, Context.Char32Ty))) 5924 goto FinishedParams; 5925 5926 // The second and final parameter must be an std::size_t 5927 T = (*Param)->getType().getUnqualifiedType(); 5928 if (Context.hasSameType(T, Context.getSizeType()) && 5929 ++Param == FnDecl->param_end()) 5930 Valid = true; 5931 } 5932 5933 // FIXME: This diagnostic is absolutely terrible. 5934FinishedParams: 5935 if (!Valid) { 5936 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5937 << FnDecl->getDeclName(); 5938 return true; 5939 } 5940 5941 return false; 5942} 5943 5944/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5945/// linkage specification, including the language and (if present) 5946/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5947/// the location of the language string literal, which is provided 5948/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5949/// the '{' brace. Otherwise, this linkage specification does not 5950/// have any braces. 5951Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 5952 SourceLocation ExternLoc, 5953 SourceLocation LangLoc, 5954 llvm::StringRef Lang, 5955 SourceLocation LBraceLoc) { 5956 LinkageSpecDecl::LanguageIDs Language; 5957 if (Lang == "\"C\"") 5958 Language = LinkageSpecDecl::lang_c; 5959 else if (Lang == "\"C++\"") 5960 Language = LinkageSpecDecl::lang_cxx; 5961 else { 5962 Diag(LangLoc, diag::err_bad_language); 5963 return 0; 5964 } 5965 5966 // FIXME: Add all the various semantics of linkage specifications 5967 5968 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5969 LangLoc, Language, 5970 LBraceLoc.isValid()); 5971 CurContext->addDecl(D); 5972 PushDeclContext(S, D); 5973 return D; 5974} 5975 5976/// ActOnFinishLinkageSpecification - Complete the definition of 5977/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5978/// valid, it's the position of the closing '}' brace in a linkage 5979/// specification that uses braces. 5980Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 5981 Decl *LinkageSpec, 5982 SourceLocation RBraceLoc) { 5983 if (LinkageSpec) 5984 PopDeclContext(); 5985 return LinkageSpec; 5986} 5987 5988/// \brief Perform semantic analysis for the variable declaration that 5989/// occurs within a C++ catch clause, returning the newly-created 5990/// variable. 5991VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 5992 TypeSourceInfo *TInfo, 5993 IdentifierInfo *Name, 5994 SourceLocation Loc) { 5995 bool Invalid = false; 5996 QualType ExDeclType = TInfo->getType(); 5997 5998 // Arrays and functions decay. 5999 if (ExDeclType->isArrayType()) 6000 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6001 else if (ExDeclType->isFunctionType()) 6002 ExDeclType = Context.getPointerType(ExDeclType); 6003 6004 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6005 // The exception-declaration shall not denote a pointer or reference to an 6006 // incomplete type, other than [cv] void*. 6007 // N2844 forbids rvalue references. 6008 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6009 Diag(Loc, diag::err_catch_rvalue_ref); 6010 Invalid = true; 6011 } 6012 6013 // GCC allows catching pointers and references to incomplete types 6014 // as an extension; so do we, but we warn by default. 6015 6016 QualType BaseType = ExDeclType; 6017 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6018 unsigned DK = diag::err_catch_incomplete; 6019 bool IncompleteCatchIsInvalid = true; 6020 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6021 BaseType = Ptr->getPointeeType(); 6022 Mode = 1; 6023 DK = diag::ext_catch_incomplete_ptr; 6024 IncompleteCatchIsInvalid = false; 6025 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6026 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6027 BaseType = Ref->getPointeeType(); 6028 Mode = 2; 6029 DK = diag::ext_catch_incomplete_ref; 6030 IncompleteCatchIsInvalid = false; 6031 } 6032 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6033 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6034 IncompleteCatchIsInvalid) 6035 Invalid = true; 6036 6037 if (!Invalid && !ExDeclType->isDependentType() && 6038 RequireNonAbstractType(Loc, ExDeclType, 6039 diag::err_abstract_type_in_decl, 6040 AbstractVariableType)) 6041 Invalid = true; 6042 6043 // Only the non-fragile NeXT runtime currently supports C++ catches 6044 // of ObjC types, and no runtime supports catching ObjC types by value. 6045 if (!Invalid && getLangOptions().ObjC1) { 6046 QualType T = ExDeclType; 6047 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6048 T = RT->getPointeeType(); 6049 6050 if (T->isObjCObjectType()) { 6051 Diag(Loc, diag::err_objc_object_catch); 6052 Invalid = true; 6053 } else if (T->isObjCObjectPointerType()) { 6054 if (!getLangOptions().NeXTRuntime) { 6055 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6056 Invalid = true; 6057 } else if (!getLangOptions().ObjCNonFragileABI) { 6058 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6059 Invalid = true; 6060 } 6061 } 6062 } 6063 6064 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6065 Name, ExDeclType, TInfo, SC_None, 6066 SC_None); 6067 ExDecl->setExceptionVariable(true); 6068 6069 if (!Invalid) { 6070 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6071 // C++ [except.handle]p16: 6072 // The object declared in an exception-declaration or, if the 6073 // exception-declaration does not specify a name, a temporary (12.2) is 6074 // copy-initialized (8.5) from the exception object. [...] 6075 // The object is destroyed when the handler exits, after the destruction 6076 // of any automatic objects initialized within the handler. 6077 // 6078 // We just pretend to initialize the object with itself, then make sure 6079 // it can be destroyed later. 6080 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6081 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6082 Loc, ExDeclType, 0); 6083 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6084 SourceLocation()); 6085 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6086 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6087 MultiExprArg(*this, &ExDeclRef, 1)); 6088 if (Result.isInvalid()) 6089 Invalid = true; 6090 else 6091 FinalizeVarWithDestructor(ExDecl, RecordTy); 6092 } 6093 } 6094 6095 if (Invalid) 6096 ExDecl->setInvalidDecl(); 6097 6098 return ExDecl; 6099} 6100 6101/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6102/// handler. 6103Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6104 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6105 QualType ExDeclType = TInfo->getType(); 6106 6107 bool Invalid = D.isInvalidType(); 6108 IdentifierInfo *II = D.getIdentifier(); 6109 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6110 LookupOrdinaryName, 6111 ForRedeclaration)) { 6112 // The scope should be freshly made just for us. There is just no way 6113 // it contains any previous declaration. 6114 assert(!S->isDeclScope(PrevDecl)); 6115 if (PrevDecl->isTemplateParameter()) { 6116 // Maybe we will complain about the shadowed template parameter. 6117 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6118 } 6119 } 6120 6121 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6122 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6123 << D.getCXXScopeSpec().getRange(); 6124 Invalid = true; 6125 } 6126 6127 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6128 D.getIdentifier(), 6129 D.getIdentifierLoc()); 6130 6131 if (Invalid) 6132 ExDecl->setInvalidDecl(); 6133 6134 // Add the exception declaration into this scope. 6135 if (II) 6136 PushOnScopeChains(ExDecl, S); 6137 else 6138 CurContext->addDecl(ExDecl); 6139 6140 ProcessDeclAttributes(S, ExDecl, D); 6141 return ExDecl; 6142} 6143 6144Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6145 Expr *AssertExpr, 6146 Expr *AssertMessageExpr_) { 6147 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6148 6149 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6150 llvm::APSInt Value(32); 6151 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6152 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6153 AssertExpr->getSourceRange(); 6154 return 0; 6155 } 6156 6157 if (Value == 0) { 6158 Diag(AssertLoc, diag::err_static_assert_failed) 6159 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6160 } 6161 } 6162 6163 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6164 AssertExpr, AssertMessage); 6165 6166 CurContext->addDecl(Decl); 6167 return Decl; 6168} 6169 6170/// \brief Perform semantic analysis of the given friend type declaration. 6171/// 6172/// \returns A friend declaration that. 6173FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6174 TypeSourceInfo *TSInfo) { 6175 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6176 6177 QualType T = TSInfo->getType(); 6178 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6179 6180 if (!getLangOptions().CPlusPlus0x) { 6181 // C++03 [class.friend]p2: 6182 // An elaborated-type-specifier shall be used in a friend declaration 6183 // for a class.* 6184 // 6185 // * The class-key of the elaborated-type-specifier is required. 6186 if (!ActiveTemplateInstantiations.empty()) { 6187 // Do not complain about the form of friend template types during 6188 // template instantiation; we will already have complained when the 6189 // template was declared. 6190 } else if (!T->isElaboratedTypeSpecifier()) { 6191 // If we evaluated the type to a record type, suggest putting 6192 // a tag in front. 6193 if (const RecordType *RT = T->getAs<RecordType>()) { 6194 RecordDecl *RD = RT->getDecl(); 6195 6196 std::string InsertionText = std::string(" ") + RD->getKindName(); 6197 6198 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6199 << (unsigned) RD->getTagKind() 6200 << T 6201 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6202 InsertionText); 6203 } else { 6204 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6205 << T 6206 << SourceRange(FriendLoc, TypeRange.getEnd()); 6207 } 6208 } else if (T->getAs<EnumType>()) { 6209 Diag(FriendLoc, diag::ext_enum_friend) 6210 << T 6211 << SourceRange(FriendLoc, TypeRange.getEnd()); 6212 } 6213 } 6214 6215 // C++0x [class.friend]p3: 6216 // If the type specifier in a friend declaration designates a (possibly 6217 // cv-qualified) class type, that class is declared as a friend; otherwise, 6218 // the friend declaration is ignored. 6219 6220 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6221 // in [class.friend]p3 that we do not implement. 6222 6223 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6224} 6225 6226/// Handle a friend type declaration. This works in tandem with 6227/// ActOnTag. 6228/// 6229/// Notes on friend class templates: 6230/// 6231/// We generally treat friend class declarations as if they were 6232/// declaring a class. So, for example, the elaborated type specifier 6233/// in a friend declaration is required to obey the restrictions of a 6234/// class-head (i.e. no typedefs in the scope chain), template 6235/// parameters are required to match up with simple template-ids, &c. 6236/// However, unlike when declaring a template specialization, it's 6237/// okay to refer to a template specialization without an empty 6238/// template parameter declaration, e.g. 6239/// friend class A<T>::B<unsigned>; 6240/// We permit this as a special case; if there are any template 6241/// parameters present at all, require proper matching, i.e. 6242/// template <> template <class T> friend class A<int>::B; 6243Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6244 MultiTemplateParamsArg TempParams) { 6245 SourceLocation Loc = DS.getSourceRange().getBegin(); 6246 6247 assert(DS.isFriendSpecified()); 6248 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6249 6250 // Try to convert the decl specifier to a type. This works for 6251 // friend templates because ActOnTag never produces a ClassTemplateDecl 6252 // for a TUK_Friend. 6253 Declarator TheDeclarator(DS, Declarator::MemberContext); 6254 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6255 QualType T = TSI->getType(); 6256 if (TheDeclarator.isInvalidType()) 6257 return 0; 6258 6259 // This is definitely an error in C++98. It's probably meant to 6260 // be forbidden in C++0x, too, but the specification is just 6261 // poorly written. 6262 // 6263 // The problem is with declarations like the following: 6264 // template <T> friend A<T>::foo; 6265 // where deciding whether a class C is a friend or not now hinges 6266 // on whether there exists an instantiation of A that causes 6267 // 'foo' to equal C. There are restrictions on class-heads 6268 // (which we declare (by fiat) elaborated friend declarations to 6269 // be) that makes this tractable. 6270 // 6271 // FIXME: handle "template <> friend class A<T>;", which 6272 // is possibly well-formed? Who even knows? 6273 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6274 Diag(Loc, diag::err_tagless_friend_type_template) 6275 << DS.getSourceRange(); 6276 return 0; 6277 } 6278 6279 // C++98 [class.friend]p1: A friend of a class is a function 6280 // or class that is not a member of the class . . . 6281 // This is fixed in DR77, which just barely didn't make the C++03 6282 // deadline. It's also a very silly restriction that seriously 6283 // affects inner classes and which nobody else seems to implement; 6284 // thus we never diagnose it, not even in -pedantic. 6285 // 6286 // But note that we could warn about it: it's always useless to 6287 // friend one of your own members (it's not, however, worthless to 6288 // friend a member of an arbitrary specialization of your template). 6289 6290 Decl *D; 6291 if (unsigned NumTempParamLists = TempParams.size()) 6292 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6293 NumTempParamLists, 6294 (TemplateParameterList**) TempParams.release(), 6295 TSI, 6296 DS.getFriendSpecLoc()); 6297 else 6298 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6299 6300 if (!D) 6301 return 0; 6302 6303 D->setAccess(AS_public); 6304 CurContext->addDecl(D); 6305 6306 return D; 6307} 6308 6309Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6310 MultiTemplateParamsArg TemplateParams) { 6311 const DeclSpec &DS = D.getDeclSpec(); 6312 6313 assert(DS.isFriendSpecified()); 6314 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6315 6316 SourceLocation Loc = D.getIdentifierLoc(); 6317 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6318 QualType T = TInfo->getType(); 6319 6320 // C++ [class.friend]p1 6321 // A friend of a class is a function or class.... 6322 // Note that this sees through typedefs, which is intended. 6323 // It *doesn't* see through dependent types, which is correct 6324 // according to [temp.arg.type]p3: 6325 // If a declaration acquires a function type through a 6326 // type dependent on a template-parameter and this causes 6327 // a declaration that does not use the syntactic form of a 6328 // function declarator to have a function type, the program 6329 // is ill-formed. 6330 if (!T->isFunctionType()) { 6331 Diag(Loc, diag::err_unexpected_friend); 6332 6333 // It might be worthwhile to try to recover by creating an 6334 // appropriate declaration. 6335 return 0; 6336 } 6337 6338 // C++ [namespace.memdef]p3 6339 // - If a friend declaration in a non-local class first declares a 6340 // class or function, the friend class or function is a member 6341 // of the innermost enclosing namespace. 6342 // - The name of the friend is not found by simple name lookup 6343 // until a matching declaration is provided in that namespace 6344 // scope (either before or after the class declaration granting 6345 // friendship). 6346 // - If a friend function is called, its name may be found by the 6347 // name lookup that considers functions from namespaces and 6348 // classes associated with the types of the function arguments. 6349 // - When looking for a prior declaration of a class or a function 6350 // declared as a friend, scopes outside the innermost enclosing 6351 // namespace scope are not considered. 6352 6353 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6354 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6355 DeclarationName Name = NameInfo.getName(); 6356 assert(Name); 6357 6358 // The context we found the declaration in, or in which we should 6359 // create the declaration. 6360 DeclContext *DC; 6361 Scope *DCScope = S; 6362 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6363 ForRedeclaration); 6364 6365 // FIXME: there are different rules in local classes 6366 6367 // There are four cases here. 6368 // - There's no scope specifier, in which case we just go to the 6369 // appropriate scope and look for a function or function template 6370 // there as appropriate. 6371 // Recover from invalid scope qualifiers as if they just weren't there. 6372 if (SS.isInvalid() || !SS.isSet()) { 6373 // C++0x [namespace.memdef]p3: 6374 // If the name in a friend declaration is neither qualified nor 6375 // a template-id and the declaration is a function or an 6376 // elaborated-type-specifier, the lookup to determine whether 6377 // the entity has been previously declared shall not consider 6378 // any scopes outside the innermost enclosing namespace. 6379 // C++0x [class.friend]p11: 6380 // If a friend declaration appears in a local class and the name 6381 // specified is an unqualified name, a prior declaration is 6382 // looked up without considering scopes that are outside the 6383 // innermost enclosing non-class scope. For a friend function 6384 // declaration, if there is no prior declaration, the program is 6385 // ill-formed. 6386 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6387 6388 // Find the appropriate context according to the above. 6389 DC = CurContext; 6390 while (true) { 6391 // Skip class contexts. If someone can cite chapter and verse 6392 // for this behavior, that would be nice --- it's what GCC and 6393 // EDG do, and it seems like a reasonable intent, but the spec 6394 // really only says that checks for unqualified existing 6395 // declarations should stop at the nearest enclosing namespace, 6396 // not that they should only consider the nearest enclosing 6397 // namespace. 6398 while (DC->isRecord()) 6399 DC = DC->getParent(); 6400 6401 LookupQualifiedName(Previous, DC); 6402 6403 // TODO: decide what we think about using declarations. 6404 if (isLocal || !Previous.empty()) 6405 break; 6406 6407 if (DC->isFileContext()) break; 6408 DC = DC->getParent(); 6409 } 6410 6411 // C++ [class.friend]p1: A friend of a class is a function or 6412 // class that is not a member of the class . . . 6413 // C++0x changes this for both friend types and functions. 6414 // Most C++ 98 compilers do seem to give an error here, so 6415 // we do, too. 6416 if (!Previous.empty() && DC->Equals(CurContext) 6417 && !getLangOptions().CPlusPlus0x) 6418 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6419 6420 DCScope = getScopeForDeclContext(S, DC); 6421 6422 // - There's a non-dependent scope specifier, in which case we 6423 // compute it and do a previous lookup there for a function 6424 // or function template. 6425 } else if (!SS.getScopeRep()->isDependent()) { 6426 DC = computeDeclContext(SS); 6427 if (!DC) return 0; 6428 6429 if (RequireCompleteDeclContext(SS, DC)) return 0; 6430 6431 LookupQualifiedName(Previous, DC); 6432 6433 // Ignore things found implicitly in the wrong scope. 6434 // TODO: better diagnostics for this case. Suggesting the right 6435 // qualified scope would be nice... 6436 LookupResult::Filter F = Previous.makeFilter(); 6437 while (F.hasNext()) { 6438 NamedDecl *D = F.next(); 6439 if (!DC->InEnclosingNamespaceSetOf( 6440 D->getDeclContext()->getRedeclContext())) 6441 F.erase(); 6442 } 6443 F.done(); 6444 6445 if (Previous.empty()) { 6446 D.setInvalidType(); 6447 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6448 return 0; 6449 } 6450 6451 // C++ [class.friend]p1: A friend of a class is a function or 6452 // class that is not a member of the class . . . 6453 if (DC->Equals(CurContext)) 6454 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6455 6456 // - There's a scope specifier that does not match any template 6457 // parameter lists, in which case we use some arbitrary context, 6458 // create a method or method template, and wait for instantiation. 6459 // - There's a scope specifier that does match some template 6460 // parameter lists, which we don't handle right now. 6461 } else { 6462 DC = CurContext; 6463 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6464 } 6465 6466 if (!DC->isRecord()) { 6467 // This implies that it has to be an operator or function. 6468 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6469 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6470 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6471 Diag(Loc, diag::err_introducing_special_friend) << 6472 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6473 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6474 return 0; 6475 } 6476 } 6477 6478 bool Redeclaration = false; 6479 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6480 move(TemplateParams), 6481 IsDefinition, 6482 Redeclaration); 6483 if (!ND) return 0; 6484 6485 assert(ND->getDeclContext() == DC); 6486 assert(ND->getLexicalDeclContext() == CurContext); 6487 6488 // Add the function declaration to the appropriate lookup tables, 6489 // adjusting the redeclarations list as necessary. We don't 6490 // want to do this yet if the friending class is dependent. 6491 // 6492 // Also update the scope-based lookup if the target context's 6493 // lookup context is in lexical scope. 6494 if (!CurContext->isDependentContext()) { 6495 DC = DC->getRedeclContext(); 6496 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6497 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6498 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6499 } 6500 6501 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6502 D.getIdentifierLoc(), ND, 6503 DS.getFriendSpecLoc()); 6504 FrD->setAccess(AS_public); 6505 CurContext->addDecl(FrD); 6506 6507 if (ND->isInvalidDecl()) 6508 FrD->setInvalidDecl(); 6509 6510 return ND; 6511} 6512 6513void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6514 AdjustDeclIfTemplate(Dcl); 6515 6516 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6517 if (!Fn) { 6518 Diag(DelLoc, diag::err_deleted_non_function); 6519 return; 6520 } 6521 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6522 Diag(DelLoc, diag::err_deleted_decl_not_first); 6523 Diag(Prev->getLocation(), diag::note_previous_declaration); 6524 // If the declaration wasn't the first, we delete the function anyway for 6525 // recovery. 6526 } 6527 Fn->setDeleted(); 6528} 6529 6530static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6531 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6532 ++CI) { 6533 Stmt *SubStmt = *CI; 6534 if (!SubStmt) 6535 continue; 6536 if (isa<ReturnStmt>(SubStmt)) 6537 Self.Diag(SubStmt->getSourceRange().getBegin(), 6538 diag::err_return_in_constructor_handler); 6539 if (!isa<Expr>(SubStmt)) 6540 SearchForReturnInStmt(Self, SubStmt); 6541 } 6542} 6543 6544void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6545 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6546 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6547 SearchForReturnInStmt(*this, Handler); 6548 } 6549} 6550 6551bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6552 const CXXMethodDecl *Old) { 6553 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6554 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6555 6556 if (Context.hasSameType(NewTy, OldTy) || 6557 NewTy->isDependentType() || OldTy->isDependentType()) 6558 return false; 6559 6560 // Check if the return types are covariant 6561 QualType NewClassTy, OldClassTy; 6562 6563 /// Both types must be pointers or references to classes. 6564 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6565 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6566 NewClassTy = NewPT->getPointeeType(); 6567 OldClassTy = OldPT->getPointeeType(); 6568 } 6569 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6570 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6571 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6572 NewClassTy = NewRT->getPointeeType(); 6573 OldClassTy = OldRT->getPointeeType(); 6574 } 6575 } 6576 } 6577 6578 // The return types aren't either both pointers or references to a class type. 6579 if (NewClassTy.isNull()) { 6580 Diag(New->getLocation(), 6581 diag::err_different_return_type_for_overriding_virtual_function) 6582 << New->getDeclName() << NewTy << OldTy; 6583 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6584 6585 return true; 6586 } 6587 6588 // C++ [class.virtual]p6: 6589 // If the return type of D::f differs from the return type of B::f, the 6590 // class type in the return type of D::f shall be complete at the point of 6591 // declaration of D::f or shall be the class type D. 6592 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6593 if (!RT->isBeingDefined() && 6594 RequireCompleteType(New->getLocation(), NewClassTy, 6595 PDiag(diag::err_covariant_return_incomplete) 6596 << New->getDeclName())) 6597 return true; 6598 } 6599 6600 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6601 // Check if the new class derives from the old class. 6602 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6603 Diag(New->getLocation(), 6604 diag::err_covariant_return_not_derived) 6605 << New->getDeclName() << NewTy << OldTy; 6606 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6607 return true; 6608 } 6609 6610 // Check if we the conversion from derived to base is valid. 6611 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6612 diag::err_covariant_return_inaccessible_base, 6613 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6614 // FIXME: Should this point to the return type? 6615 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6616 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6617 return true; 6618 } 6619 } 6620 6621 // The qualifiers of the return types must be the same. 6622 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6623 Diag(New->getLocation(), 6624 diag::err_covariant_return_type_different_qualifications) 6625 << New->getDeclName() << NewTy << OldTy; 6626 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6627 return true; 6628 }; 6629 6630 6631 // The new class type must have the same or less qualifiers as the old type. 6632 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6633 Diag(New->getLocation(), 6634 diag::err_covariant_return_type_class_type_more_qualified) 6635 << New->getDeclName() << NewTy << OldTy; 6636 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6637 return true; 6638 }; 6639 6640 return false; 6641} 6642 6643bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6644 const CXXMethodDecl *Old) 6645{ 6646 if (Old->hasAttr<FinalAttr>()) { 6647 Diag(New->getLocation(), diag::err_final_function_overridden) 6648 << New->getDeclName(); 6649 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6650 return true; 6651 } 6652 6653 return false; 6654} 6655 6656/// \brief Mark the given method pure. 6657/// 6658/// \param Method the method to be marked pure. 6659/// 6660/// \param InitRange the source range that covers the "0" initializer. 6661bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6662 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6663 Method->setPure(); 6664 return false; 6665 } 6666 6667 if (!Method->isInvalidDecl()) 6668 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6669 << Method->getDeclName() << InitRange; 6670 return true; 6671} 6672 6673/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6674/// an initializer for the out-of-line declaration 'Dcl'. The scope 6675/// is a fresh scope pushed for just this purpose. 6676/// 6677/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6678/// static data member of class X, names should be looked up in the scope of 6679/// class X. 6680void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6681 // If there is no declaration, there was an error parsing it. 6682 if (D == 0) return; 6683 6684 // We should only get called for declarations with scope specifiers, like: 6685 // int foo::bar; 6686 assert(D->isOutOfLine()); 6687 EnterDeclaratorContext(S, D->getDeclContext()); 6688} 6689 6690/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6691/// initializer for the out-of-line declaration 'D'. 6692void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6693 // If there is no declaration, there was an error parsing it. 6694 if (D == 0) return; 6695 6696 assert(D->isOutOfLine()); 6697 ExitDeclaratorContext(S); 6698} 6699 6700/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6701/// C++ if/switch/while/for statement. 6702/// e.g: "if (int x = f()) {...}" 6703DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6704 // C++ 6.4p2: 6705 // The declarator shall not specify a function or an array. 6706 // The type-specifier-seq shall not contain typedef and shall not declare a 6707 // new class or enumeration. 6708 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6709 "Parser allowed 'typedef' as storage class of condition decl."); 6710 6711 TagDecl *OwnedTag = 0; 6712 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6713 QualType Ty = TInfo->getType(); 6714 6715 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6716 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6717 // would be created and CXXConditionDeclExpr wants a VarDecl. 6718 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6719 << D.getSourceRange(); 6720 return DeclResult(); 6721 } else if (OwnedTag && OwnedTag->isDefinition()) { 6722 // The type-specifier-seq shall not declare a new class or enumeration. 6723 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6724 } 6725 6726 Decl *Dcl = ActOnDeclarator(S, D); 6727 if (!Dcl) 6728 return DeclResult(); 6729 6730 return Dcl; 6731} 6732 6733void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6734 bool DefinitionRequired) { 6735 // Ignore any vtable uses in unevaluated operands or for classes that do 6736 // not have a vtable. 6737 if (!Class->isDynamicClass() || Class->isDependentContext() || 6738 CurContext->isDependentContext() || 6739 ExprEvalContexts.back().Context == Unevaluated) 6740 return; 6741 6742 // Try to insert this class into the map. 6743 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6744 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6745 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6746 if (!Pos.second) { 6747 // If we already had an entry, check to see if we are promoting this vtable 6748 // to required a definition. If so, we need to reappend to the VTableUses 6749 // list, since we may have already processed the first entry. 6750 if (DefinitionRequired && !Pos.first->second) { 6751 Pos.first->second = true; 6752 } else { 6753 // Otherwise, we can early exit. 6754 return; 6755 } 6756 } 6757 6758 // Local classes need to have their virtual members marked 6759 // immediately. For all other classes, we mark their virtual members 6760 // at the end of the translation unit. 6761 if (Class->isLocalClass()) 6762 MarkVirtualMembersReferenced(Loc, Class); 6763 else 6764 VTableUses.push_back(std::make_pair(Class, Loc)); 6765} 6766 6767bool Sema::DefineUsedVTables() { 6768 // If any dynamic classes have their key function defined within 6769 // this translation unit, then those vtables are considered "used" and must 6770 // be emitted. 6771 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6772 if (const CXXMethodDecl *KeyFunction 6773 = Context.getKeyFunction(DynamicClasses[I])) { 6774 const FunctionDecl *Definition = 0; 6775 if (KeyFunction->hasBody(Definition)) 6776 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6777 } 6778 } 6779 6780 if (VTableUses.empty()) 6781 return false; 6782 6783 // Note: The VTableUses vector could grow as a result of marking 6784 // the members of a class as "used", so we check the size each 6785 // time through the loop and prefer indices (with are stable) to 6786 // iterators (which are not). 6787 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6788 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6789 if (!Class) 6790 continue; 6791 6792 SourceLocation Loc = VTableUses[I].second; 6793 6794 // If this class has a key function, but that key function is 6795 // defined in another translation unit, we don't need to emit the 6796 // vtable even though we're using it. 6797 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6798 if (KeyFunction && !KeyFunction->hasBody()) { 6799 switch (KeyFunction->getTemplateSpecializationKind()) { 6800 case TSK_Undeclared: 6801 case TSK_ExplicitSpecialization: 6802 case TSK_ExplicitInstantiationDeclaration: 6803 // The key function is in another translation unit. 6804 continue; 6805 6806 case TSK_ExplicitInstantiationDefinition: 6807 case TSK_ImplicitInstantiation: 6808 // We will be instantiating the key function. 6809 break; 6810 } 6811 } else if (!KeyFunction) { 6812 // If we have a class with no key function that is the subject 6813 // of an explicit instantiation declaration, suppress the 6814 // vtable; it will live with the explicit instantiation 6815 // definition. 6816 bool IsExplicitInstantiationDeclaration 6817 = Class->getTemplateSpecializationKind() 6818 == TSK_ExplicitInstantiationDeclaration; 6819 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6820 REnd = Class->redecls_end(); 6821 R != REnd; ++R) { 6822 TemplateSpecializationKind TSK 6823 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6824 if (TSK == TSK_ExplicitInstantiationDeclaration) 6825 IsExplicitInstantiationDeclaration = true; 6826 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6827 IsExplicitInstantiationDeclaration = false; 6828 break; 6829 } 6830 } 6831 6832 if (IsExplicitInstantiationDeclaration) 6833 continue; 6834 } 6835 6836 // Mark all of the virtual members of this class as referenced, so 6837 // that we can build a vtable. Then, tell the AST consumer that a 6838 // vtable for this class is required. 6839 MarkVirtualMembersReferenced(Loc, Class); 6840 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6841 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6842 6843 // Optionally warn if we're emitting a weak vtable. 6844 if (Class->getLinkage() == ExternalLinkage && 6845 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6846 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6847 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6848 } 6849 } 6850 VTableUses.clear(); 6851 6852 return true; 6853} 6854 6855void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6856 const CXXRecordDecl *RD) { 6857 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6858 e = RD->method_end(); i != e; ++i) { 6859 CXXMethodDecl *MD = *i; 6860 6861 // C++ [basic.def.odr]p2: 6862 // [...] A virtual member function is used if it is not pure. [...] 6863 if (MD->isVirtual() && !MD->isPure()) 6864 MarkDeclarationReferenced(Loc, MD); 6865 } 6866 6867 // Only classes that have virtual bases need a VTT. 6868 if (RD->getNumVBases() == 0) 6869 return; 6870 6871 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6872 e = RD->bases_end(); i != e; ++i) { 6873 const CXXRecordDecl *Base = 6874 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6875 if (Base->getNumVBases() == 0) 6876 continue; 6877 MarkVirtualMembersReferenced(Loc, Base); 6878 } 6879} 6880 6881/// SetIvarInitializers - This routine builds initialization ASTs for the 6882/// Objective-C implementation whose ivars need be initialized. 6883void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6884 if (!getLangOptions().CPlusPlus) 6885 return; 6886 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6887 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6888 CollectIvarsToConstructOrDestruct(OID, ivars); 6889 if (ivars.empty()) 6890 return; 6891 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6892 for (unsigned i = 0; i < ivars.size(); i++) { 6893 FieldDecl *Field = ivars[i]; 6894 if (Field->isInvalidDecl()) 6895 continue; 6896 6897 CXXBaseOrMemberInitializer *Member; 6898 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6899 InitializationKind InitKind = 6900 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6901 6902 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6903 ExprResult MemberInit = 6904 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 6905 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 6906 // Note, MemberInit could actually come back empty if no initialization 6907 // is required (e.g., because it would call a trivial default constructor) 6908 if (!MemberInit.get() || MemberInit.isInvalid()) 6909 continue; 6910 6911 Member = 6912 new (Context) CXXBaseOrMemberInitializer(Context, 6913 Field, SourceLocation(), 6914 SourceLocation(), 6915 MemberInit.takeAs<Expr>(), 6916 SourceLocation()); 6917 AllToInit.push_back(Member); 6918 6919 // Be sure that the destructor is accessible and is marked as referenced. 6920 if (const RecordType *RecordTy 6921 = Context.getBaseElementType(Field->getType()) 6922 ->getAs<RecordType>()) { 6923 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6924 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6925 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6926 CheckDestructorAccess(Field->getLocation(), Destructor, 6927 PDiag(diag::err_access_dtor_ivar) 6928 << Context.getBaseElementType(Field->getType())); 6929 } 6930 } 6931 } 6932 ObjCImplementation->setIvarInitializers(Context, 6933 AllToInit.data(), AllToInit.size()); 6934 } 6935} 6936