SemaDeclCXX.cpp revision 8a72621a019a0b3ae793b1f5fc6da2243476979f
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check that the default argument is well-formed 181 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 182 if (DefaultArgChecker.Visit(DefaultArg)) { 183 Param->setInvalidDecl(); 184 return; 185 } 186 187 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 188} 189 190/// ActOnParamUnparsedDefaultArgument - We've seen a default 191/// argument for a function parameter, but we can't parse it yet 192/// because we're inside a class definition. Note that this default 193/// argument will be parsed later. 194void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 195 SourceLocation EqualLoc, 196 SourceLocation ArgLoc) { 197 if (!param) 198 return; 199 200 ParmVarDecl *Param = cast<ParmVarDecl>(param); 201 if (Param) 202 Param->setUnparsedDefaultArg(); 203 204 UnparsedDefaultArgLocs[Param] = ArgLoc; 205} 206 207/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 208/// the default argument for the parameter param failed. 209void Sema::ActOnParamDefaultArgumentError(Decl *param) { 210 if (!param) 211 return; 212 213 ParmVarDecl *Param = cast<ParmVarDecl>(param); 214 215 Param->setInvalidDecl(); 216 217 UnparsedDefaultArgLocs.erase(Param); 218} 219 220/// CheckExtraCXXDefaultArguments - Check for any extra default 221/// arguments in the declarator, which is not a function declaration 222/// or definition and therefore is not permitted to have default 223/// arguments. This routine should be invoked for every declarator 224/// that is not a function declaration or definition. 225void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 226 // C++ [dcl.fct.default]p3 227 // A default argument expression shall be specified only in the 228 // parameter-declaration-clause of a function declaration or in a 229 // template-parameter (14.1). It shall not be specified for a 230 // parameter pack. If it is specified in a 231 // parameter-declaration-clause, it shall not occur within a 232 // declarator or abstract-declarator of a parameter-declaration. 233 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 234 DeclaratorChunk &chunk = D.getTypeObject(i); 235 if (chunk.Kind == DeclaratorChunk::Function) { 236 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 237 ParmVarDecl *Param = 238 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 239 if (Param->hasUnparsedDefaultArg()) { 240 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 241 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 242 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 243 delete Toks; 244 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 245 } else if (Param->getDefaultArg()) { 246 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 247 << Param->getDefaultArg()->getSourceRange(); 248 Param->setDefaultArg(0); 249 } 250 } 251 } 252 } 253} 254 255// MergeCXXFunctionDecl - Merge two declarations of the same C++ 256// function, once we already know that they have the same 257// type. Subroutine of MergeFunctionDecl. Returns true if there was an 258// error, false otherwise. 259bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 260 bool Invalid = false; 261 262 // C++ [dcl.fct.default]p4: 263 // For non-template functions, default arguments can be added in 264 // later declarations of a function in the same 265 // scope. Declarations in different scopes have completely 266 // distinct sets of default arguments. That is, declarations in 267 // inner scopes do not acquire default arguments from 268 // declarations in outer scopes, and vice versa. In a given 269 // function declaration, all parameters subsequent to a 270 // parameter with a default argument shall have default 271 // arguments supplied in this or previous declarations. A 272 // default argument shall not be redefined by a later 273 // declaration (not even to the same value). 274 // 275 // C++ [dcl.fct.default]p6: 276 // Except for member functions of class templates, the default arguments 277 // in a member function definition that appears outside of the class 278 // definition are added to the set of default arguments provided by the 279 // member function declaration in the class definition. 280 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 281 ParmVarDecl *OldParam = Old->getParamDecl(p); 282 ParmVarDecl *NewParam = New->getParamDecl(p); 283 284 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 285 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 286 // hint here. Alternatively, we could walk the type-source information 287 // for NewParam to find the last source location in the type... but it 288 // isn't worth the effort right now. This is the kind of test case that 289 // is hard to get right: 290 291 // int f(int); 292 // void g(int (*fp)(int) = f); 293 // void g(int (*fp)(int) = &f); 294 Diag(NewParam->getLocation(), 295 diag::err_param_default_argument_redefinition) 296 << NewParam->getDefaultArgRange(); 297 298 // Look for the function declaration where the default argument was 299 // actually written, which may be a declaration prior to Old. 300 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 301 Older; Older = Older->getPreviousDeclaration()) { 302 if (!Older->getParamDecl(p)->hasDefaultArg()) 303 break; 304 305 OldParam = Older->getParamDecl(p); 306 } 307 308 Diag(OldParam->getLocation(), diag::note_previous_definition) 309 << OldParam->getDefaultArgRange(); 310 Invalid = true; 311 } else if (OldParam->hasDefaultArg()) { 312 // Merge the old default argument into the new parameter. 313 // It's important to use getInit() here; getDefaultArg() 314 // strips off any top-level CXXExprWithTemporaries. 315 NewParam->setHasInheritedDefaultArg(); 316 if (OldParam->hasUninstantiatedDefaultArg()) 317 NewParam->setUninstantiatedDefaultArg( 318 OldParam->getUninstantiatedDefaultArg()); 319 else 320 NewParam->setDefaultArg(OldParam->getInit()); 321 } else if (NewParam->hasDefaultArg()) { 322 if (New->getDescribedFunctionTemplate()) { 323 // Paragraph 4, quoted above, only applies to non-template functions. 324 Diag(NewParam->getLocation(), 325 diag::err_param_default_argument_template_redecl) 326 << NewParam->getDefaultArgRange(); 327 Diag(Old->getLocation(), diag::note_template_prev_declaration) 328 << false; 329 } else if (New->getTemplateSpecializationKind() 330 != TSK_ImplicitInstantiation && 331 New->getTemplateSpecializationKind() != TSK_Undeclared) { 332 // C++ [temp.expr.spec]p21: 333 // Default function arguments shall not be specified in a declaration 334 // or a definition for one of the following explicit specializations: 335 // - the explicit specialization of a function template; 336 // - the explicit specialization of a member function template; 337 // - the explicit specialization of a member function of a class 338 // template where the class template specialization to which the 339 // member function specialization belongs is implicitly 340 // instantiated. 341 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 342 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 343 << New->getDeclName() 344 << NewParam->getDefaultArgRange(); 345 } else if (New->getDeclContext()->isDependentContext()) { 346 // C++ [dcl.fct.default]p6 (DR217): 347 // Default arguments for a member function of a class template shall 348 // be specified on the initial declaration of the member function 349 // within the class template. 350 // 351 // Reading the tea leaves a bit in DR217 and its reference to DR205 352 // leads me to the conclusion that one cannot add default function 353 // arguments for an out-of-line definition of a member function of a 354 // dependent type. 355 int WhichKind = 2; 356 if (CXXRecordDecl *Record 357 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 358 if (Record->getDescribedClassTemplate()) 359 WhichKind = 0; 360 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 361 WhichKind = 1; 362 else 363 WhichKind = 2; 364 } 365 366 Diag(NewParam->getLocation(), 367 diag::err_param_default_argument_member_template_redecl) 368 << WhichKind 369 << NewParam->getDefaultArgRange(); 370 } 371 } 372 } 373 374 if (CheckEquivalentExceptionSpec(Old, New)) 375 Invalid = true; 376 377 return Invalid; 378} 379 380/// CheckCXXDefaultArguments - Verify that the default arguments for a 381/// function declaration are well-formed according to C++ 382/// [dcl.fct.default]. 383void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 384 unsigned NumParams = FD->getNumParams(); 385 unsigned p; 386 387 // Find first parameter with a default argument 388 for (p = 0; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (Param->hasDefaultArg()) 391 break; 392 } 393 394 // C++ [dcl.fct.default]p4: 395 // In a given function declaration, all parameters 396 // subsequent to a parameter with a default argument shall 397 // have default arguments supplied in this or previous 398 // declarations. A default argument shall not be redefined 399 // by a later declaration (not even to the same value). 400 unsigned LastMissingDefaultArg = 0; 401 for (; p < NumParams; ++p) { 402 ParmVarDecl *Param = FD->getParamDecl(p); 403 if (!Param->hasDefaultArg()) { 404 if (Param->isInvalidDecl()) 405 /* We already complained about this parameter. */; 406 else if (Param->getIdentifier()) 407 Diag(Param->getLocation(), 408 diag::err_param_default_argument_missing_name) 409 << Param->getIdentifier(); 410 else 411 Diag(Param->getLocation(), 412 diag::err_param_default_argument_missing); 413 414 LastMissingDefaultArg = p; 415 } 416 } 417 418 if (LastMissingDefaultArg > 0) { 419 // Some default arguments were missing. Clear out all of the 420 // default arguments up to (and including) the last missing 421 // default argument, so that we leave the function parameters 422 // in a semantically valid state. 423 for (p = 0; p <= LastMissingDefaultArg; ++p) { 424 ParmVarDecl *Param = FD->getParamDecl(p); 425 if (Param->hasDefaultArg()) { 426 Param->setDefaultArg(0); 427 } 428 } 429 } 430} 431 432/// isCurrentClassName - Determine whether the identifier II is the 433/// name of the class type currently being defined. In the case of 434/// nested classes, this will only return true if II is the name of 435/// the innermost class. 436bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 437 const CXXScopeSpec *SS) { 438 assert(getLangOptions().CPlusPlus && "No class names in C!"); 439 440 CXXRecordDecl *CurDecl; 441 if (SS && SS->isSet() && !SS->isInvalid()) { 442 DeclContext *DC = computeDeclContext(*SS, true); 443 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 444 } else 445 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 446 447 if (CurDecl && CurDecl->getIdentifier()) 448 return &II == CurDecl->getIdentifier(); 449 else 450 return false; 451} 452 453/// \brief Check the validity of a C++ base class specifier. 454/// 455/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 456/// and returns NULL otherwise. 457CXXBaseSpecifier * 458Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 459 SourceRange SpecifierRange, 460 bool Virtual, AccessSpecifier Access, 461 TypeSourceInfo *TInfo) { 462 QualType BaseType = TInfo->getType(); 463 464 // C++ [class.union]p1: 465 // A union shall not have base classes. 466 if (Class->isUnion()) { 467 Diag(Class->getLocation(), diag::err_base_clause_on_union) 468 << SpecifierRange; 469 return 0; 470 } 471 472 if (BaseType->isDependentType()) 473 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 474 Class->getTagKind() == TTK_Class, 475 Access, TInfo); 476 477 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 478 479 // Base specifiers must be record types. 480 if (!BaseType->isRecordType()) { 481 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 482 return 0; 483 } 484 485 // C++ [class.union]p1: 486 // A union shall not be used as a base class. 487 if (BaseType->isUnionType()) { 488 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 489 return 0; 490 } 491 492 // C++ [class.derived]p2: 493 // The class-name in a base-specifier shall not be an incompletely 494 // defined class. 495 if (RequireCompleteType(BaseLoc, BaseType, 496 PDiag(diag::err_incomplete_base_class) 497 << SpecifierRange)) { 498 Class->setInvalidDecl(); 499 return 0; 500 } 501 502 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 503 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 504 assert(BaseDecl && "Record type has no declaration"); 505 BaseDecl = BaseDecl->getDefinition(); 506 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 507 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 508 assert(CXXBaseDecl && "Base type is not a C++ type"); 509 510 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 511 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 512 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 513 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 514 << BaseType; 515 return 0; 516 } 517 518 if (BaseDecl->isInvalidDecl()) 519 Class->setInvalidDecl(); 520 521 // Create the base specifier. 522 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 523 Class->getTagKind() == TTK_Class, 524 Access, TInfo); 525} 526 527/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 528/// one entry in the base class list of a class specifier, for 529/// example: 530/// class foo : public bar, virtual private baz { 531/// 'public bar' and 'virtual private baz' are each base-specifiers. 532BaseResult 533Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 534 bool Virtual, AccessSpecifier Access, 535 ParsedType basetype, SourceLocation BaseLoc) { 536 if (!classdecl) 537 return true; 538 539 AdjustDeclIfTemplate(classdecl); 540 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 541 if (!Class) 542 return true; 543 544 TypeSourceInfo *TInfo = 0; 545 GetTypeFromParser(basetype, &TInfo); 546 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 547 Virtual, Access, TInfo)) 548 return BaseSpec; 549 550 return true; 551} 552 553/// \brief Performs the actual work of attaching the given base class 554/// specifiers to a C++ class. 555bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 556 unsigned NumBases) { 557 if (NumBases == 0) 558 return false; 559 560 // Used to keep track of which base types we have already seen, so 561 // that we can properly diagnose redundant direct base types. Note 562 // that the key is always the unqualified canonical type of the base 563 // class. 564 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 565 566 // Copy non-redundant base specifiers into permanent storage. 567 unsigned NumGoodBases = 0; 568 bool Invalid = false; 569 for (unsigned idx = 0; idx < NumBases; ++idx) { 570 QualType NewBaseType 571 = Context.getCanonicalType(Bases[idx]->getType()); 572 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 573 if (!Class->hasObjectMember()) { 574 if (const RecordType *FDTTy = 575 NewBaseType.getTypePtr()->getAs<RecordType>()) 576 if (FDTTy->getDecl()->hasObjectMember()) 577 Class->setHasObjectMember(true); 578 } 579 580 if (KnownBaseTypes[NewBaseType]) { 581 // C++ [class.mi]p3: 582 // A class shall not be specified as a direct base class of a 583 // derived class more than once. 584 Diag(Bases[idx]->getSourceRange().getBegin(), 585 diag::err_duplicate_base_class) 586 << KnownBaseTypes[NewBaseType]->getType() 587 << Bases[idx]->getSourceRange(); 588 589 // Delete the duplicate base class specifier; we're going to 590 // overwrite its pointer later. 591 Context.Deallocate(Bases[idx]); 592 593 Invalid = true; 594 } else { 595 // Okay, add this new base class. 596 KnownBaseTypes[NewBaseType] = Bases[idx]; 597 Bases[NumGoodBases++] = Bases[idx]; 598 } 599 } 600 601 // Attach the remaining base class specifiers to the derived class. 602 Class->setBases(Bases, NumGoodBases); 603 604 // Delete the remaining (good) base class specifiers, since their 605 // data has been copied into the CXXRecordDecl. 606 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 607 Context.Deallocate(Bases[idx]); 608 609 return Invalid; 610} 611 612/// ActOnBaseSpecifiers - Attach the given base specifiers to the 613/// class, after checking whether there are any duplicate base 614/// classes. 615void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 616 unsigned NumBases) { 617 if (!ClassDecl || !Bases || !NumBases) 618 return; 619 620 AdjustDeclIfTemplate(ClassDecl); 621 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 622 (CXXBaseSpecifier**)(Bases), NumBases); 623} 624 625static CXXRecordDecl *GetClassForType(QualType T) { 626 if (const RecordType *RT = T->getAs<RecordType>()) 627 return cast<CXXRecordDecl>(RT->getDecl()); 628 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 629 return ICT->getDecl(); 630 else 631 return 0; 632} 633 634/// \brief Determine whether the type \p Derived is a C++ class that is 635/// derived from the type \p Base. 636bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 637 if (!getLangOptions().CPlusPlus) 638 return false; 639 640 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 641 if (!DerivedRD) 642 return false; 643 644 CXXRecordDecl *BaseRD = GetClassForType(Base); 645 if (!BaseRD) 646 return false; 647 648 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 649 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 650} 651 652/// \brief Determine whether the type \p Derived is a C++ class that is 653/// derived from the type \p Base. 654bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 655 if (!getLangOptions().CPlusPlus) 656 return false; 657 658 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 659 if (!DerivedRD) 660 return false; 661 662 CXXRecordDecl *BaseRD = GetClassForType(Base); 663 if (!BaseRD) 664 return false; 665 666 return DerivedRD->isDerivedFrom(BaseRD, Paths); 667} 668 669void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 670 CXXCastPath &BasePathArray) { 671 assert(BasePathArray.empty() && "Base path array must be empty!"); 672 assert(Paths.isRecordingPaths() && "Must record paths!"); 673 674 const CXXBasePath &Path = Paths.front(); 675 676 // We first go backward and check if we have a virtual base. 677 // FIXME: It would be better if CXXBasePath had the base specifier for 678 // the nearest virtual base. 679 unsigned Start = 0; 680 for (unsigned I = Path.size(); I != 0; --I) { 681 if (Path[I - 1].Base->isVirtual()) { 682 Start = I - 1; 683 break; 684 } 685 } 686 687 // Now add all bases. 688 for (unsigned I = Start, E = Path.size(); I != E; ++I) 689 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 690} 691 692/// \brief Determine whether the given base path includes a virtual 693/// base class. 694bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 695 for (CXXCastPath::const_iterator B = BasePath.begin(), 696 BEnd = BasePath.end(); 697 B != BEnd; ++B) 698 if ((*B)->isVirtual()) 699 return true; 700 701 return false; 702} 703 704/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 705/// conversion (where Derived and Base are class types) is 706/// well-formed, meaning that the conversion is unambiguous (and 707/// that all of the base classes are accessible). Returns true 708/// and emits a diagnostic if the code is ill-formed, returns false 709/// otherwise. Loc is the location where this routine should point to 710/// if there is an error, and Range is the source range to highlight 711/// if there is an error. 712bool 713Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 714 unsigned InaccessibleBaseID, 715 unsigned AmbigiousBaseConvID, 716 SourceLocation Loc, SourceRange Range, 717 DeclarationName Name, 718 CXXCastPath *BasePath) { 719 // First, determine whether the path from Derived to Base is 720 // ambiguous. This is slightly more expensive than checking whether 721 // the Derived to Base conversion exists, because here we need to 722 // explore multiple paths to determine if there is an ambiguity. 723 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 724 /*DetectVirtual=*/false); 725 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 726 assert(DerivationOkay && 727 "Can only be used with a derived-to-base conversion"); 728 (void)DerivationOkay; 729 730 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 731 if (InaccessibleBaseID) { 732 // Check that the base class can be accessed. 733 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 734 InaccessibleBaseID)) { 735 case AR_inaccessible: 736 return true; 737 case AR_accessible: 738 case AR_dependent: 739 case AR_delayed: 740 break; 741 } 742 } 743 744 // Build a base path if necessary. 745 if (BasePath) 746 BuildBasePathArray(Paths, *BasePath); 747 return false; 748 } 749 750 // We know that the derived-to-base conversion is ambiguous, and 751 // we're going to produce a diagnostic. Perform the derived-to-base 752 // search just one more time to compute all of the possible paths so 753 // that we can print them out. This is more expensive than any of 754 // the previous derived-to-base checks we've done, but at this point 755 // performance isn't as much of an issue. 756 Paths.clear(); 757 Paths.setRecordingPaths(true); 758 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 759 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 760 (void)StillOkay; 761 762 // Build up a textual representation of the ambiguous paths, e.g., 763 // D -> B -> A, that will be used to illustrate the ambiguous 764 // conversions in the diagnostic. We only print one of the paths 765 // to each base class subobject. 766 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 767 768 Diag(Loc, AmbigiousBaseConvID) 769 << Derived << Base << PathDisplayStr << Range << Name; 770 return true; 771} 772 773bool 774Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 775 SourceLocation Loc, SourceRange Range, 776 CXXCastPath *BasePath, 777 bool IgnoreAccess) { 778 return CheckDerivedToBaseConversion(Derived, Base, 779 IgnoreAccess ? 0 780 : diag::err_upcast_to_inaccessible_base, 781 diag::err_ambiguous_derived_to_base_conv, 782 Loc, Range, DeclarationName(), 783 BasePath); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 823Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 824 SourceLocation ASLoc, 825 SourceLocation ColonLoc) { 826 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 827 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 828 ASLoc, ColonLoc); 829 CurContext->addHiddenDecl(ASDecl); 830 return ASDecl; 831} 832 833/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 834/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 835/// bitfield width if there is one and 'InitExpr' specifies the initializer if 836/// any. 837Decl * 838Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 839 MultiTemplateParamsArg TemplateParameterLists, 840 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 841 bool Deleted) { 842 const DeclSpec &DS = D.getDeclSpec(); 843 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 844 DeclarationName Name = NameInfo.getName(); 845 SourceLocation Loc = NameInfo.getLoc(); 846 847 // For anonymous bitfields, the location should point to the type. 848 if (Loc.isInvalid()) 849 Loc = D.getSourceRange().getBegin(); 850 851 Expr *BitWidth = static_cast<Expr*>(BW); 852 Expr *Init = static_cast<Expr*>(InitExpr); 853 854 assert(isa<CXXRecordDecl>(CurContext)); 855 assert(!DS.isFriendSpecified()); 856 857 bool isFunc = false; 858 if (D.isFunctionDeclarator()) 859 isFunc = true; 860 else if (D.getNumTypeObjects() == 0 && 861 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 862 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 863 isFunc = TDType->isFunctionType(); 864 } 865 866 // C++ 9.2p6: A member shall not be declared to have automatic storage 867 // duration (auto, register) or with the extern storage-class-specifier. 868 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 869 // data members and cannot be applied to names declared const or static, 870 // and cannot be applied to reference members. 871 switch (DS.getStorageClassSpec()) { 872 case DeclSpec::SCS_unspecified: 873 case DeclSpec::SCS_typedef: 874 case DeclSpec::SCS_static: 875 // FALL THROUGH. 876 break; 877 case DeclSpec::SCS_mutable: 878 if (isFunc) { 879 if (DS.getStorageClassSpecLoc().isValid()) 880 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 881 else 882 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 883 884 // FIXME: It would be nicer if the keyword was ignored only for this 885 // declarator. Otherwise we could get follow-up errors. 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 break; 889 default: 890 if (DS.getStorageClassSpecLoc().isValid()) 891 Diag(DS.getStorageClassSpecLoc(), 892 diag::err_storageclass_invalid_for_member); 893 else 894 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 895 D.getMutableDeclSpec().ClearStorageClassSpecs(); 896 } 897 898 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 899 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 900 !isFunc); 901 902 Decl *Member; 903 if (isInstField) { 904 CXXScopeSpec &SS = D.getCXXScopeSpec(); 905 906 907 if (SS.isSet() && !SS.isInvalid()) { 908 // The user provided a superfluous scope specifier inside a class 909 // definition: 910 // 911 // class X { 912 // int X::member; 913 // }; 914 DeclContext *DC = 0; 915 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 916 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 917 << Name << FixItHint::CreateRemoval(SS.getRange()); 918 else 919 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 920 << Name << SS.getRange(); 921 922 SS.clear(); 923 } 924 925 // FIXME: Check for template parameters! 926 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 927 AS); 928 assert(Member && "HandleField never returns null"); 929 } else { 930 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 931 if (!Member) { 932 return 0; 933 } 934 935 // Non-instance-fields can't have a bitfield. 936 if (BitWidth) { 937 if (Member->isInvalidDecl()) { 938 // don't emit another diagnostic. 939 } else if (isa<VarDecl>(Member)) { 940 // C++ 9.6p3: A bit-field shall not be a static member. 941 // "static member 'A' cannot be a bit-field" 942 Diag(Loc, diag::err_static_not_bitfield) 943 << Name << BitWidth->getSourceRange(); 944 } else if (isa<TypedefDecl>(Member)) { 945 // "typedef member 'x' cannot be a bit-field" 946 Diag(Loc, diag::err_typedef_not_bitfield) 947 << Name << BitWidth->getSourceRange(); 948 } else { 949 // A function typedef ("typedef int f(); f a;"). 950 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 951 Diag(Loc, diag::err_not_integral_type_bitfield) 952 << Name << cast<ValueDecl>(Member)->getType() 953 << BitWidth->getSourceRange(); 954 } 955 956 BitWidth = 0; 957 Member->setInvalidDecl(); 958 } 959 960 Member->setAccess(AS); 961 962 // If we have declared a member function template, set the access of the 963 // templated declaration as well. 964 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 965 FunTmpl->getTemplatedDecl()->setAccess(AS); 966 } 967 968 assert((Name || isInstField) && "No identifier for non-field ?"); 969 970 if (Init) 971 AddInitializerToDecl(Member, Init, false); 972 if (Deleted) // FIXME: Source location is not very good. 973 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 974 975 if (isInstField) { 976 FieldCollector->Add(cast<FieldDecl>(Member)); 977 return 0; 978 } 979 return Member; 980} 981 982/// \brief Find the direct and/or virtual base specifiers that 983/// correspond to the given base type, for use in base initialization 984/// within a constructor. 985static bool FindBaseInitializer(Sema &SemaRef, 986 CXXRecordDecl *ClassDecl, 987 QualType BaseType, 988 const CXXBaseSpecifier *&DirectBaseSpec, 989 const CXXBaseSpecifier *&VirtualBaseSpec) { 990 // First, check for a direct base class. 991 DirectBaseSpec = 0; 992 for (CXXRecordDecl::base_class_const_iterator Base 993 = ClassDecl->bases_begin(); 994 Base != ClassDecl->bases_end(); ++Base) { 995 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 996 // We found a direct base of this type. That's what we're 997 // initializing. 998 DirectBaseSpec = &*Base; 999 break; 1000 } 1001 } 1002 1003 // Check for a virtual base class. 1004 // FIXME: We might be able to short-circuit this if we know in advance that 1005 // there are no virtual bases. 1006 VirtualBaseSpec = 0; 1007 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1008 // We haven't found a base yet; search the class hierarchy for a 1009 // virtual base class. 1010 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1011 /*DetectVirtual=*/false); 1012 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1013 BaseType, Paths)) { 1014 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1015 Path != Paths.end(); ++Path) { 1016 if (Path->back().Base->isVirtual()) { 1017 VirtualBaseSpec = Path->back().Base; 1018 break; 1019 } 1020 } 1021 } 1022 } 1023 1024 return DirectBaseSpec || VirtualBaseSpec; 1025} 1026 1027/// ActOnMemInitializer - Handle a C++ member initializer. 1028MemInitResult 1029Sema::ActOnMemInitializer(Decl *ConstructorD, 1030 Scope *S, 1031 CXXScopeSpec &SS, 1032 IdentifierInfo *MemberOrBase, 1033 ParsedType TemplateTypeTy, 1034 SourceLocation IdLoc, 1035 SourceLocation LParenLoc, 1036 ExprTy **Args, unsigned NumArgs, 1037 SourceLocation RParenLoc) { 1038 if (!ConstructorD) 1039 return true; 1040 1041 AdjustDeclIfTemplate(ConstructorD); 1042 1043 CXXConstructorDecl *Constructor 1044 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1045 if (!Constructor) { 1046 // The user wrote a constructor initializer on a function that is 1047 // not a C++ constructor. Ignore the error for now, because we may 1048 // have more member initializers coming; we'll diagnose it just 1049 // once in ActOnMemInitializers. 1050 return true; 1051 } 1052 1053 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1054 1055 // C++ [class.base.init]p2: 1056 // Names in a mem-initializer-id are looked up in the scope of the 1057 // constructor's class and, if not found in that scope, are looked 1058 // up in the scope containing the constructor's definition. 1059 // [Note: if the constructor's class contains a member with the 1060 // same name as a direct or virtual base class of the class, a 1061 // mem-initializer-id naming the member or base class and composed 1062 // of a single identifier refers to the class member. A 1063 // mem-initializer-id for the hidden base class may be specified 1064 // using a qualified name. ] 1065 if (!SS.getScopeRep() && !TemplateTypeTy) { 1066 // Look for a member, first. 1067 FieldDecl *Member = 0; 1068 DeclContext::lookup_result Result 1069 = ClassDecl->lookup(MemberOrBase); 1070 if (Result.first != Result.second) { 1071 Member = dyn_cast<FieldDecl>(*Result.first); 1072 1073 // Handle anonymous union case. 1074 if (!Member) 1075 if (IndirectFieldDecl* IndirectField 1076 = dyn_cast<IndirectFieldDecl>(*Result.first)) 1077 Member = IndirectField->getAnonField(); 1078 } 1079 1080 if (Member) 1081 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1082 LParenLoc, RParenLoc); 1083 } 1084 // It didn't name a member, so see if it names a class. 1085 QualType BaseType; 1086 TypeSourceInfo *TInfo = 0; 1087 1088 if (TemplateTypeTy) { 1089 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1090 } else { 1091 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1092 LookupParsedName(R, S, &SS); 1093 1094 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1095 if (!TyD) { 1096 if (R.isAmbiguous()) return true; 1097 1098 // We don't want access-control diagnostics here. 1099 R.suppressDiagnostics(); 1100 1101 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1102 bool NotUnknownSpecialization = false; 1103 DeclContext *DC = computeDeclContext(SS, false); 1104 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1105 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1106 1107 if (!NotUnknownSpecialization) { 1108 // When the scope specifier can refer to a member of an unknown 1109 // specialization, we take it as a type name. 1110 BaseType = CheckTypenameType(ETK_None, 1111 (NestedNameSpecifier *)SS.getScopeRep(), 1112 *MemberOrBase, SourceLocation(), 1113 SS.getRange(), IdLoc); 1114 if (BaseType.isNull()) 1115 return true; 1116 1117 R.clear(); 1118 R.setLookupName(MemberOrBase); 1119 } 1120 } 1121 1122 // If no results were found, try to correct typos. 1123 if (R.empty() && BaseType.isNull() && 1124 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1125 R.isSingleResult()) { 1126 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1127 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1128 // We have found a non-static data member with a similar 1129 // name to what was typed; complain and initialize that 1130 // member. 1131 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1132 << MemberOrBase << true << R.getLookupName() 1133 << FixItHint::CreateReplacement(R.getNameLoc(), 1134 R.getLookupName().getAsString()); 1135 Diag(Member->getLocation(), diag::note_previous_decl) 1136 << Member->getDeclName(); 1137 1138 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1139 LParenLoc, RParenLoc); 1140 } 1141 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1142 const CXXBaseSpecifier *DirectBaseSpec; 1143 const CXXBaseSpecifier *VirtualBaseSpec; 1144 if (FindBaseInitializer(*this, ClassDecl, 1145 Context.getTypeDeclType(Type), 1146 DirectBaseSpec, VirtualBaseSpec)) { 1147 // We have found a direct or virtual base class with a 1148 // similar name to what was typed; complain and initialize 1149 // that base class. 1150 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1151 << MemberOrBase << false << R.getLookupName() 1152 << FixItHint::CreateReplacement(R.getNameLoc(), 1153 R.getLookupName().getAsString()); 1154 1155 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1156 : VirtualBaseSpec; 1157 Diag(BaseSpec->getSourceRange().getBegin(), 1158 diag::note_base_class_specified_here) 1159 << BaseSpec->getType() 1160 << BaseSpec->getSourceRange(); 1161 1162 TyD = Type; 1163 } 1164 } 1165 } 1166 1167 if (!TyD && BaseType.isNull()) { 1168 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1169 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1170 return true; 1171 } 1172 } 1173 1174 if (BaseType.isNull()) { 1175 BaseType = Context.getTypeDeclType(TyD); 1176 if (SS.isSet()) { 1177 NestedNameSpecifier *Qualifier = 1178 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1179 1180 // FIXME: preserve source range information 1181 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1182 } 1183 } 1184 } 1185 1186 if (!TInfo) 1187 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1188 1189 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1190 LParenLoc, RParenLoc, ClassDecl); 1191} 1192 1193/// Checks an initializer expression for use of uninitialized fields, such as 1194/// containing the field that is being initialized. Returns true if there is an 1195/// uninitialized field was used an updates the SourceLocation parameter; false 1196/// otherwise. 1197static bool InitExprContainsUninitializedFields(const Stmt *S, 1198 const FieldDecl *LhsField, 1199 SourceLocation *L) { 1200 if (isa<CallExpr>(S)) { 1201 // Do not descend into function calls or constructors, as the use 1202 // of an uninitialized field may be valid. One would have to inspect 1203 // the contents of the function/ctor to determine if it is safe or not. 1204 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1205 // may be safe, depending on what the function/ctor does. 1206 return false; 1207 } 1208 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1209 const NamedDecl *RhsField = ME->getMemberDecl(); 1210 1211 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1212 // The member expression points to a static data member. 1213 assert(VD->isStaticDataMember() && 1214 "Member points to non-static data member!"); 1215 (void)VD; 1216 return false; 1217 } 1218 1219 if (isa<EnumConstantDecl>(RhsField)) { 1220 // The member expression points to an enum. 1221 return false; 1222 } 1223 1224 if (RhsField == LhsField) { 1225 // Initializing a field with itself. Throw a warning. 1226 // But wait; there are exceptions! 1227 // Exception #1: The field may not belong to this record. 1228 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1229 const Expr *base = ME->getBase(); 1230 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1231 // Even though the field matches, it does not belong to this record. 1232 return false; 1233 } 1234 // None of the exceptions triggered; return true to indicate an 1235 // uninitialized field was used. 1236 *L = ME->getMemberLoc(); 1237 return true; 1238 } 1239 } else if (isa<SizeOfAlignOfExpr>(S)) { 1240 // sizeof/alignof doesn't reference contents, do not warn. 1241 return false; 1242 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1243 // address-of doesn't reference contents (the pointer may be dereferenced 1244 // in the same expression but it would be rare; and weird). 1245 if (UOE->getOpcode() == UO_AddrOf) 1246 return false; 1247 } 1248 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1249 it != e; ++it) { 1250 if (!*it) { 1251 // An expression such as 'member(arg ?: "")' may trigger this. 1252 continue; 1253 } 1254 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1255 return true; 1256 } 1257 return false; 1258} 1259 1260MemInitResult 1261Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1262 unsigned NumArgs, SourceLocation IdLoc, 1263 SourceLocation LParenLoc, 1264 SourceLocation RParenLoc) { 1265 if (Member->isInvalidDecl()) 1266 return true; 1267 1268 // Diagnose value-uses of fields to initialize themselves, e.g. 1269 // foo(foo) 1270 // where foo is not also a parameter to the constructor. 1271 // TODO: implement -Wuninitialized and fold this into that framework. 1272 for (unsigned i = 0; i < NumArgs; ++i) { 1273 SourceLocation L; 1274 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1275 // FIXME: Return true in the case when other fields are used before being 1276 // uninitialized. For example, let this field be the i'th field. When 1277 // initializing the i'th field, throw a warning if any of the >= i'th 1278 // fields are used, as they are not yet initialized. 1279 // Right now we are only handling the case where the i'th field uses 1280 // itself in its initializer. 1281 Diag(L, diag::warn_field_is_uninit); 1282 } 1283 } 1284 1285 bool HasDependentArg = false; 1286 for (unsigned i = 0; i < NumArgs; i++) 1287 HasDependentArg |= Args[i]->isTypeDependent(); 1288 1289 if (Member->getType()->isDependentType() || HasDependentArg) { 1290 // Can't check initialization for a member of dependent type or when 1291 // any of the arguments are type-dependent expressions. 1292 Expr *Init 1293 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1294 RParenLoc); 1295 1296 // Erase any temporaries within this evaluation context; we're not 1297 // going to track them in the AST, since we'll be rebuilding the 1298 // ASTs during template instantiation. 1299 ExprTemporaries.erase( 1300 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1301 ExprTemporaries.end()); 1302 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init, 1306 RParenLoc); 1307 1308 } 1309 1310 // Initialize the member. 1311 InitializedEntity MemberEntity = 1312 InitializedEntity::InitializeMember(Member, 0); 1313 InitializationKind Kind = 1314 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1315 1316 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1317 1318 ExprResult MemberInit = 1319 InitSeq.Perform(*this, MemberEntity, Kind, 1320 MultiExprArg(*this, Args, NumArgs), 0); 1321 if (MemberInit.isInvalid()) 1322 return true; 1323 1324 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1325 1326 // C++0x [class.base.init]p7: 1327 // The initialization of each base and member constitutes a 1328 // full-expression. 1329 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1330 if (MemberInit.isInvalid()) 1331 return true; 1332 1333 // If we are in a dependent context, template instantiation will 1334 // perform this type-checking again. Just save the arguments that we 1335 // received in a ParenListExpr. 1336 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1337 // of the information that we have about the member 1338 // initializer. However, deconstructing the ASTs is a dicey process, 1339 // and this approach is far more likely to get the corner cases right. 1340 if (CurContext->isDependentContext()) { 1341 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1342 RParenLoc); 1343 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1344 LParenLoc, 1345 Init, 1346 RParenLoc); 1347 } 1348 1349 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1350 LParenLoc, 1351 MemberInit.get(), 1352 RParenLoc); 1353} 1354 1355MemInitResult 1356Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1357 Expr **Args, unsigned NumArgs, 1358 SourceLocation LParenLoc, SourceLocation RParenLoc, 1359 CXXRecordDecl *ClassDecl) { 1360 bool HasDependentArg = false; 1361 for (unsigned i = 0; i < NumArgs; i++) 1362 HasDependentArg |= Args[i]->isTypeDependent(); 1363 1364 SourceLocation BaseLoc 1365 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1366 1367 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1368 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1369 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1370 1371 // C++ [class.base.init]p2: 1372 // [...] Unless the mem-initializer-id names a nonstatic data 1373 // member of the constructor's class or a direct or virtual base 1374 // of that class, the mem-initializer is ill-formed. A 1375 // mem-initializer-list can initialize a base class using any 1376 // name that denotes that base class type. 1377 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1378 1379 // Check for direct and virtual base classes. 1380 const CXXBaseSpecifier *DirectBaseSpec = 0; 1381 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1382 if (!Dependent) { 1383 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1384 VirtualBaseSpec); 1385 1386 // C++ [base.class.init]p2: 1387 // Unless the mem-initializer-id names a nonstatic data member of the 1388 // constructor's class or a direct or virtual base of that class, the 1389 // mem-initializer is ill-formed. 1390 if (!DirectBaseSpec && !VirtualBaseSpec) { 1391 // If the class has any dependent bases, then it's possible that 1392 // one of those types will resolve to the same type as 1393 // BaseType. Therefore, just treat this as a dependent base 1394 // class initialization. FIXME: Should we try to check the 1395 // initialization anyway? It seems odd. 1396 if (ClassDecl->hasAnyDependentBases()) 1397 Dependent = true; 1398 else 1399 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1400 << BaseType << Context.getTypeDeclType(ClassDecl) 1401 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1402 } 1403 } 1404 1405 if (Dependent) { 1406 // Can't check initialization for a base of dependent type or when 1407 // any of the arguments are type-dependent expressions. 1408 ExprResult BaseInit 1409 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1410 RParenLoc)); 1411 1412 // Erase any temporaries within this evaluation context; we're not 1413 // going to track them in the AST, since we'll be rebuilding the 1414 // ASTs during template instantiation. 1415 ExprTemporaries.erase( 1416 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1417 ExprTemporaries.end()); 1418 1419 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1420 /*IsVirtual=*/false, 1421 LParenLoc, 1422 BaseInit.takeAs<Expr>(), 1423 RParenLoc); 1424 } 1425 1426 // C++ [base.class.init]p2: 1427 // If a mem-initializer-id is ambiguous because it designates both 1428 // a direct non-virtual base class and an inherited virtual base 1429 // class, the mem-initializer is ill-formed. 1430 if (DirectBaseSpec && VirtualBaseSpec) 1431 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1432 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1433 1434 CXXBaseSpecifier *BaseSpec 1435 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1436 if (!BaseSpec) 1437 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1438 1439 // Initialize the base. 1440 InitializedEntity BaseEntity = 1441 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1442 InitializationKind Kind = 1443 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1444 1445 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1446 1447 ExprResult BaseInit = 1448 InitSeq.Perform(*this, BaseEntity, Kind, 1449 MultiExprArg(*this, Args, NumArgs), 0); 1450 if (BaseInit.isInvalid()) 1451 return true; 1452 1453 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1454 1455 // C++0x [class.base.init]p7: 1456 // The initialization of each base and member constitutes a 1457 // full-expression. 1458 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1459 if (BaseInit.isInvalid()) 1460 return true; 1461 1462 // If we are in a dependent context, template instantiation will 1463 // perform this type-checking again. Just save the arguments that we 1464 // received in a ParenListExpr. 1465 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1466 // of the information that we have about the base 1467 // initializer. However, deconstructing the ASTs is a dicey process, 1468 // and this approach is far more likely to get the corner cases right. 1469 if (CurContext->isDependentContext()) { 1470 ExprResult Init 1471 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1472 RParenLoc)); 1473 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1474 BaseSpec->isVirtual(), 1475 LParenLoc, 1476 Init.takeAs<Expr>(), 1477 RParenLoc); 1478 } 1479 1480 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1481 BaseSpec->isVirtual(), 1482 LParenLoc, 1483 BaseInit.takeAs<Expr>(), 1484 RParenLoc); 1485} 1486 1487/// ImplicitInitializerKind - How an implicit base or member initializer should 1488/// initialize its base or member. 1489enum ImplicitInitializerKind { 1490 IIK_Default, 1491 IIK_Copy, 1492 IIK_Move 1493}; 1494 1495static bool 1496BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1497 ImplicitInitializerKind ImplicitInitKind, 1498 CXXBaseSpecifier *BaseSpec, 1499 bool IsInheritedVirtualBase, 1500 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1501 InitializedEntity InitEntity 1502 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1503 IsInheritedVirtualBase); 1504 1505 ExprResult BaseInit; 1506 1507 switch (ImplicitInitKind) { 1508 case IIK_Default: { 1509 InitializationKind InitKind 1510 = InitializationKind::CreateDefault(Constructor->getLocation()); 1511 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1512 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1513 MultiExprArg(SemaRef, 0, 0)); 1514 break; 1515 } 1516 1517 case IIK_Copy: { 1518 ParmVarDecl *Param = Constructor->getParamDecl(0); 1519 QualType ParamType = Param->getType().getNonReferenceType(); 1520 1521 Expr *CopyCtorArg = 1522 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1523 Constructor->getLocation(), ParamType, 1524 VK_LValue, 0); 1525 1526 // Cast to the base class to avoid ambiguities. 1527 QualType ArgTy = 1528 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1529 ParamType.getQualifiers()); 1530 1531 CXXCastPath BasePath; 1532 BasePath.push_back(BaseSpec); 1533 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1534 CK_UncheckedDerivedToBase, 1535 VK_LValue, &BasePath); 1536 1537 InitializationKind InitKind 1538 = InitializationKind::CreateDirect(Constructor->getLocation(), 1539 SourceLocation(), SourceLocation()); 1540 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1541 &CopyCtorArg, 1); 1542 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1543 MultiExprArg(&CopyCtorArg, 1)); 1544 break; 1545 } 1546 1547 case IIK_Move: 1548 assert(false && "Unhandled initializer kind!"); 1549 } 1550 1551 if (BaseInit.isInvalid()) 1552 return true; 1553 1554 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1555 if (BaseInit.isInvalid()) 1556 return true; 1557 1558 CXXBaseInit = 1559 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1560 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1561 SourceLocation()), 1562 BaseSpec->isVirtual(), 1563 SourceLocation(), 1564 BaseInit.takeAs<Expr>(), 1565 SourceLocation()); 1566 1567 return false; 1568} 1569 1570static bool 1571BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1572 ImplicitInitializerKind ImplicitInitKind, 1573 FieldDecl *Field, 1574 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1575 if (Field->isInvalidDecl()) 1576 return true; 1577 1578 SourceLocation Loc = Constructor->getLocation(); 1579 1580 if (ImplicitInitKind == IIK_Copy) { 1581 ParmVarDecl *Param = Constructor->getParamDecl(0); 1582 QualType ParamType = Param->getType().getNonReferenceType(); 1583 1584 Expr *MemberExprBase = 1585 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1586 Loc, ParamType, VK_LValue, 0); 1587 1588 // Build a reference to this field within the parameter. 1589 CXXScopeSpec SS; 1590 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1591 Sema::LookupMemberName); 1592 MemberLookup.addDecl(Field, AS_public); 1593 MemberLookup.resolveKind(); 1594 ExprResult CopyCtorArg 1595 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1596 ParamType, Loc, 1597 /*IsArrow=*/false, 1598 SS, 1599 /*FirstQualifierInScope=*/0, 1600 MemberLookup, 1601 /*TemplateArgs=*/0); 1602 if (CopyCtorArg.isInvalid()) 1603 return true; 1604 1605 // When the field we are copying is an array, create index variables for 1606 // each dimension of the array. We use these index variables to subscript 1607 // the source array, and other clients (e.g., CodeGen) will perform the 1608 // necessary iteration with these index variables. 1609 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1610 QualType BaseType = Field->getType(); 1611 QualType SizeType = SemaRef.Context.getSizeType(); 1612 while (const ConstantArrayType *Array 1613 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1614 // Create the iteration variable for this array index. 1615 IdentifierInfo *IterationVarName = 0; 1616 { 1617 llvm::SmallString<8> Str; 1618 llvm::raw_svector_ostream OS(Str); 1619 OS << "__i" << IndexVariables.size(); 1620 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1621 } 1622 VarDecl *IterationVar 1623 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1624 IterationVarName, SizeType, 1625 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1626 SC_None, SC_None); 1627 IndexVariables.push_back(IterationVar); 1628 1629 // Create a reference to the iteration variable. 1630 ExprResult IterationVarRef 1631 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1632 assert(!IterationVarRef.isInvalid() && 1633 "Reference to invented variable cannot fail!"); 1634 1635 // Subscript the array with this iteration variable. 1636 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1637 Loc, 1638 IterationVarRef.take(), 1639 Loc); 1640 if (CopyCtorArg.isInvalid()) 1641 return true; 1642 1643 BaseType = Array->getElementType(); 1644 } 1645 1646 // Construct the entity that we will be initializing. For an array, this 1647 // will be first element in the array, which may require several levels 1648 // of array-subscript entities. 1649 llvm::SmallVector<InitializedEntity, 4> Entities; 1650 Entities.reserve(1 + IndexVariables.size()); 1651 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1652 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1653 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1654 0, 1655 Entities.back())); 1656 1657 // Direct-initialize to use the copy constructor. 1658 InitializationKind InitKind = 1659 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1660 1661 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1662 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1663 &CopyCtorArgE, 1); 1664 1665 ExprResult MemberInit 1666 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1667 MultiExprArg(&CopyCtorArgE, 1)); 1668 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1669 if (MemberInit.isInvalid()) 1670 return true; 1671 1672 CXXMemberInit 1673 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1674 MemberInit.takeAs<Expr>(), Loc, 1675 IndexVariables.data(), 1676 IndexVariables.size()); 1677 return false; 1678 } 1679 1680 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1681 1682 QualType FieldBaseElementType = 1683 SemaRef.Context.getBaseElementType(Field->getType()); 1684 1685 if (FieldBaseElementType->isRecordType()) { 1686 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1687 InitializationKind InitKind = 1688 InitializationKind::CreateDefault(Loc); 1689 1690 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1691 ExprResult MemberInit = 1692 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1693 if (MemberInit.isInvalid()) 1694 return true; 1695 1696 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1697 if (MemberInit.isInvalid()) 1698 return true; 1699 1700 CXXMemberInit = 1701 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1702 Field, Loc, Loc, 1703 MemberInit.get(), 1704 Loc); 1705 return false; 1706 } 1707 1708 if (FieldBaseElementType->isReferenceType()) { 1709 SemaRef.Diag(Constructor->getLocation(), 1710 diag::err_uninitialized_member_in_ctor) 1711 << (int)Constructor->isImplicit() 1712 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1713 << 0 << Field->getDeclName(); 1714 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1715 return true; 1716 } 1717 1718 if (FieldBaseElementType.isConstQualified()) { 1719 SemaRef.Diag(Constructor->getLocation(), 1720 diag::err_uninitialized_member_in_ctor) 1721 << (int)Constructor->isImplicit() 1722 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1723 << 1 << Field->getDeclName(); 1724 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1725 return true; 1726 } 1727 1728 // Nothing to initialize. 1729 CXXMemberInit = 0; 1730 return false; 1731} 1732 1733namespace { 1734struct BaseAndFieldInfo { 1735 Sema &S; 1736 CXXConstructorDecl *Ctor; 1737 bool AnyErrorsInInits; 1738 ImplicitInitializerKind IIK; 1739 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1740 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1741 1742 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1743 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1744 // FIXME: Handle implicit move constructors. 1745 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1746 IIK = IIK_Copy; 1747 else 1748 IIK = IIK_Default; 1749 } 1750}; 1751} 1752 1753static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1754 FieldDecl *Top, FieldDecl *Field, 1755 CXXBaseOrMemberInitializer *Init) { 1756 // If the member doesn't need to be initialized, Init will still be null. 1757 if (!Init) 1758 return; 1759 1760 Info.AllToInit.push_back(Init); 1761 if (Field != Top) { 1762 Init->setMember(Top); 1763 Init->setAnonUnionMember(Field); 1764 } 1765} 1766 1767static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1768 FieldDecl *Top, FieldDecl *Field) { 1769 1770 // Overwhelmingly common case: we have a direct initializer for this field. 1771 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1772 RecordFieldInitializer(Info, Top, Field, Init); 1773 return false; 1774 } 1775 1776 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1777 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1778 assert(FieldClassType && "anonymous struct/union without record type"); 1779 CXXRecordDecl *FieldClassDecl 1780 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1781 1782 // Even though union members never have non-trivial default 1783 // constructions in C++03, we still build member initializers for aggregate 1784 // record types which can be union members, and C++0x allows non-trivial 1785 // default constructors for union members, so we ensure that only one 1786 // member is initialized for these. 1787 if (FieldClassDecl->isUnion()) { 1788 // First check for an explicit initializer for one field. 1789 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1790 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1791 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1792 RecordFieldInitializer(Info, Top, *FA, Init); 1793 1794 // Once we've initialized a field of an anonymous union, the union 1795 // field in the class is also initialized, so exit immediately. 1796 return false; 1797 } else if ((*FA)->isAnonymousStructOrUnion()) { 1798 if (CollectFieldInitializer(Info, Top, *FA)) 1799 return true; 1800 } 1801 } 1802 1803 // Fallthrough and construct a default initializer for the union as 1804 // a whole, which can call its default constructor if such a thing exists 1805 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1806 // behavior going forward with C++0x, when anonymous unions there are 1807 // finalized, we should revisit this. 1808 } else { 1809 // For structs, we simply descend through to initialize all members where 1810 // necessary. 1811 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1812 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1813 if (CollectFieldInitializer(Info, Top, *FA)) 1814 return true; 1815 } 1816 } 1817 } 1818 1819 // Don't try to build an implicit initializer if there were semantic 1820 // errors in any of the initializers (and therefore we might be 1821 // missing some that the user actually wrote). 1822 if (Info.AnyErrorsInInits) 1823 return false; 1824 1825 CXXBaseOrMemberInitializer *Init = 0; 1826 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1827 return true; 1828 1829 RecordFieldInitializer(Info, Top, Field, Init); 1830 return false; 1831} 1832 1833bool 1834Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1835 CXXBaseOrMemberInitializer **Initializers, 1836 unsigned NumInitializers, 1837 bool AnyErrors) { 1838 if (Constructor->getDeclContext()->isDependentContext()) { 1839 // Just store the initializers as written, they will be checked during 1840 // instantiation. 1841 if (NumInitializers > 0) { 1842 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1843 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1844 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1845 memcpy(baseOrMemberInitializers, Initializers, 1846 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1847 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1848 } 1849 1850 return false; 1851 } 1852 1853 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1854 1855 // We need to build the initializer AST according to order of construction 1856 // and not what user specified in the Initializers list. 1857 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1858 if (!ClassDecl) 1859 return true; 1860 1861 bool HadError = false; 1862 1863 for (unsigned i = 0; i < NumInitializers; i++) { 1864 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1865 1866 if (Member->isBaseInitializer()) 1867 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1868 else 1869 Info.AllBaseFields[Member->getMember()] = Member; 1870 } 1871 1872 // Keep track of the direct virtual bases. 1873 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1874 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1875 E = ClassDecl->bases_end(); I != E; ++I) { 1876 if (I->isVirtual()) 1877 DirectVBases.insert(I); 1878 } 1879 1880 // Push virtual bases before others. 1881 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1882 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1883 1884 if (CXXBaseOrMemberInitializer *Value 1885 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1886 Info.AllToInit.push_back(Value); 1887 } else if (!AnyErrors) { 1888 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1889 CXXBaseOrMemberInitializer *CXXBaseInit; 1890 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1891 VBase, IsInheritedVirtualBase, 1892 CXXBaseInit)) { 1893 HadError = true; 1894 continue; 1895 } 1896 1897 Info.AllToInit.push_back(CXXBaseInit); 1898 } 1899 } 1900 1901 // Non-virtual bases. 1902 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1903 E = ClassDecl->bases_end(); Base != E; ++Base) { 1904 // Virtuals are in the virtual base list and already constructed. 1905 if (Base->isVirtual()) 1906 continue; 1907 1908 if (CXXBaseOrMemberInitializer *Value 1909 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1910 Info.AllToInit.push_back(Value); 1911 } else if (!AnyErrors) { 1912 CXXBaseOrMemberInitializer *CXXBaseInit; 1913 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1914 Base, /*IsInheritedVirtualBase=*/false, 1915 CXXBaseInit)) { 1916 HadError = true; 1917 continue; 1918 } 1919 1920 Info.AllToInit.push_back(CXXBaseInit); 1921 } 1922 } 1923 1924 // Fields. 1925 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1926 E = ClassDecl->field_end(); Field != E; ++Field) { 1927 if ((*Field)->getType()->isIncompleteArrayType()) { 1928 assert(ClassDecl->hasFlexibleArrayMember() && 1929 "Incomplete array type is not valid"); 1930 continue; 1931 } 1932 if (CollectFieldInitializer(Info, *Field, *Field)) 1933 HadError = true; 1934 } 1935 1936 NumInitializers = Info.AllToInit.size(); 1937 if (NumInitializers > 0) { 1938 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1939 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1940 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1941 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1942 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1943 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1944 1945 // Constructors implicitly reference the base and member 1946 // destructors. 1947 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1948 Constructor->getParent()); 1949 } 1950 1951 return HadError; 1952} 1953 1954static void *GetKeyForTopLevelField(FieldDecl *Field) { 1955 // For anonymous unions, use the class declaration as the key. 1956 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1957 if (RT->getDecl()->isAnonymousStructOrUnion()) 1958 return static_cast<void *>(RT->getDecl()); 1959 } 1960 return static_cast<void *>(Field); 1961} 1962 1963static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1964 return Context.getCanonicalType(BaseType).getTypePtr(); 1965} 1966 1967static void *GetKeyForMember(ASTContext &Context, 1968 CXXBaseOrMemberInitializer *Member, 1969 bool MemberMaybeAnon = false) { 1970 if (!Member->isMemberInitializer()) 1971 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1972 1973 // For fields injected into the class via declaration of an anonymous union, 1974 // use its anonymous union class declaration as the unique key. 1975 FieldDecl *Field = Member->getMember(); 1976 1977 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1978 // data member of the class. Data member used in the initializer list is 1979 // in AnonUnionMember field. 1980 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1981 Field = Member->getAnonUnionMember(); 1982 1983 // If the field is a member of an anonymous struct or union, our key 1984 // is the anonymous record decl that's a direct child of the class. 1985 RecordDecl *RD = Field->getParent(); 1986 if (RD->isAnonymousStructOrUnion()) { 1987 while (true) { 1988 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1989 if (Parent->isAnonymousStructOrUnion()) 1990 RD = Parent; 1991 else 1992 break; 1993 } 1994 1995 return static_cast<void *>(RD); 1996 } 1997 1998 return static_cast<void *>(Field); 1999} 2000 2001static void 2002DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2003 const CXXConstructorDecl *Constructor, 2004 CXXBaseOrMemberInitializer **Inits, 2005 unsigned NumInits) { 2006 if (Constructor->getDeclContext()->isDependentContext()) 2007 return; 2008 2009 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2010 == Diagnostic::Ignored) 2011 return; 2012 2013 // Build the list of bases and members in the order that they'll 2014 // actually be initialized. The explicit initializers should be in 2015 // this same order but may be missing things. 2016 llvm::SmallVector<const void*, 32> IdealInitKeys; 2017 2018 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2019 2020 // 1. Virtual bases. 2021 for (CXXRecordDecl::base_class_const_iterator VBase = 2022 ClassDecl->vbases_begin(), 2023 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2024 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2025 2026 // 2. Non-virtual bases. 2027 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2028 E = ClassDecl->bases_end(); Base != E; ++Base) { 2029 if (Base->isVirtual()) 2030 continue; 2031 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2032 } 2033 2034 // 3. Direct fields. 2035 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2036 E = ClassDecl->field_end(); Field != E; ++Field) 2037 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2038 2039 unsigned NumIdealInits = IdealInitKeys.size(); 2040 unsigned IdealIndex = 0; 2041 2042 CXXBaseOrMemberInitializer *PrevInit = 0; 2043 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2044 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2045 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2046 2047 // Scan forward to try to find this initializer in the idealized 2048 // initializers list. 2049 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2050 if (InitKey == IdealInitKeys[IdealIndex]) 2051 break; 2052 2053 // If we didn't find this initializer, it must be because we 2054 // scanned past it on a previous iteration. That can only 2055 // happen if we're out of order; emit a warning. 2056 if (IdealIndex == NumIdealInits && PrevInit) { 2057 Sema::SemaDiagnosticBuilder D = 2058 SemaRef.Diag(PrevInit->getSourceLocation(), 2059 diag::warn_initializer_out_of_order); 2060 2061 if (PrevInit->isMemberInitializer()) 2062 D << 0 << PrevInit->getMember()->getDeclName(); 2063 else 2064 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2065 2066 if (Init->isMemberInitializer()) 2067 D << 0 << Init->getMember()->getDeclName(); 2068 else 2069 D << 1 << Init->getBaseClassInfo()->getType(); 2070 2071 // Move back to the initializer's location in the ideal list. 2072 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2073 if (InitKey == IdealInitKeys[IdealIndex]) 2074 break; 2075 2076 assert(IdealIndex != NumIdealInits && 2077 "initializer not found in initializer list"); 2078 } 2079 2080 PrevInit = Init; 2081 } 2082} 2083 2084namespace { 2085bool CheckRedundantInit(Sema &S, 2086 CXXBaseOrMemberInitializer *Init, 2087 CXXBaseOrMemberInitializer *&PrevInit) { 2088 if (!PrevInit) { 2089 PrevInit = Init; 2090 return false; 2091 } 2092 2093 if (FieldDecl *Field = Init->getMember()) 2094 S.Diag(Init->getSourceLocation(), 2095 diag::err_multiple_mem_initialization) 2096 << Field->getDeclName() 2097 << Init->getSourceRange(); 2098 else { 2099 Type *BaseClass = Init->getBaseClass(); 2100 assert(BaseClass && "neither field nor base"); 2101 S.Diag(Init->getSourceLocation(), 2102 diag::err_multiple_base_initialization) 2103 << QualType(BaseClass, 0) 2104 << Init->getSourceRange(); 2105 } 2106 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2107 << 0 << PrevInit->getSourceRange(); 2108 2109 return true; 2110} 2111 2112typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2113typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2114 2115bool CheckRedundantUnionInit(Sema &S, 2116 CXXBaseOrMemberInitializer *Init, 2117 RedundantUnionMap &Unions) { 2118 FieldDecl *Field = Init->getMember(); 2119 RecordDecl *Parent = Field->getParent(); 2120 if (!Parent->isAnonymousStructOrUnion()) 2121 return false; 2122 2123 NamedDecl *Child = Field; 2124 do { 2125 if (Parent->isUnion()) { 2126 UnionEntry &En = Unions[Parent]; 2127 if (En.first && En.first != Child) { 2128 S.Diag(Init->getSourceLocation(), 2129 diag::err_multiple_mem_union_initialization) 2130 << Field->getDeclName() 2131 << Init->getSourceRange(); 2132 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2133 << 0 << En.second->getSourceRange(); 2134 return true; 2135 } else if (!En.first) { 2136 En.first = Child; 2137 En.second = Init; 2138 } 2139 } 2140 2141 Child = Parent; 2142 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2143 } while (Parent->isAnonymousStructOrUnion()); 2144 2145 return false; 2146} 2147} 2148 2149/// ActOnMemInitializers - Handle the member initializers for a constructor. 2150void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2151 SourceLocation ColonLoc, 2152 MemInitTy **meminits, unsigned NumMemInits, 2153 bool AnyErrors) { 2154 if (!ConstructorDecl) 2155 return; 2156 2157 AdjustDeclIfTemplate(ConstructorDecl); 2158 2159 CXXConstructorDecl *Constructor 2160 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2161 2162 if (!Constructor) { 2163 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2164 return; 2165 } 2166 2167 CXXBaseOrMemberInitializer **MemInits = 2168 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2169 2170 // Mapping for the duplicate initializers check. 2171 // For member initializers, this is keyed with a FieldDecl*. 2172 // For base initializers, this is keyed with a Type*. 2173 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2174 2175 // Mapping for the inconsistent anonymous-union initializers check. 2176 RedundantUnionMap MemberUnions; 2177 2178 bool HadError = false; 2179 for (unsigned i = 0; i < NumMemInits; i++) { 2180 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2181 2182 // Set the source order index. 2183 Init->setSourceOrder(i); 2184 2185 if (Init->isMemberInitializer()) { 2186 FieldDecl *Field = Init->getMember(); 2187 if (CheckRedundantInit(*this, Init, Members[Field]) || 2188 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2189 HadError = true; 2190 } else { 2191 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2192 if (CheckRedundantInit(*this, Init, Members[Key])) 2193 HadError = true; 2194 } 2195 } 2196 2197 if (HadError) 2198 return; 2199 2200 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2201 2202 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2203} 2204 2205void 2206Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2207 CXXRecordDecl *ClassDecl) { 2208 // Ignore dependent contexts. 2209 if (ClassDecl->isDependentContext()) 2210 return; 2211 2212 // FIXME: all the access-control diagnostics are positioned on the 2213 // field/base declaration. That's probably good; that said, the 2214 // user might reasonably want to know why the destructor is being 2215 // emitted, and we currently don't say. 2216 2217 // Non-static data members. 2218 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2219 E = ClassDecl->field_end(); I != E; ++I) { 2220 FieldDecl *Field = *I; 2221 if (Field->isInvalidDecl()) 2222 continue; 2223 QualType FieldType = Context.getBaseElementType(Field->getType()); 2224 2225 const RecordType* RT = FieldType->getAs<RecordType>(); 2226 if (!RT) 2227 continue; 2228 2229 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2230 if (FieldClassDecl->hasTrivialDestructor()) 2231 continue; 2232 2233 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2234 CheckDestructorAccess(Field->getLocation(), Dtor, 2235 PDiag(diag::err_access_dtor_field) 2236 << Field->getDeclName() 2237 << FieldType); 2238 2239 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2240 } 2241 2242 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2243 2244 // Bases. 2245 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2246 E = ClassDecl->bases_end(); Base != E; ++Base) { 2247 // Bases are always records in a well-formed non-dependent class. 2248 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2249 2250 // Remember direct virtual bases. 2251 if (Base->isVirtual()) 2252 DirectVirtualBases.insert(RT); 2253 2254 // Ignore trivial destructors. 2255 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2256 if (BaseClassDecl->hasTrivialDestructor()) 2257 continue; 2258 2259 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2260 2261 // FIXME: caret should be on the start of the class name 2262 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2263 PDiag(diag::err_access_dtor_base) 2264 << Base->getType() 2265 << Base->getSourceRange()); 2266 2267 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2268 } 2269 2270 // Virtual bases. 2271 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2272 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2273 2274 // Bases are always records in a well-formed non-dependent class. 2275 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2276 2277 // Ignore direct virtual bases. 2278 if (DirectVirtualBases.count(RT)) 2279 continue; 2280 2281 // Ignore trivial destructors. 2282 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2283 if (BaseClassDecl->hasTrivialDestructor()) 2284 continue; 2285 2286 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2287 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2288 PDiag(diag::err_access_dtor_vbase) 2289 << VBase->getType()); 2290 2291 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2292 } 2293} 2294 2295void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2296 if (!CDtorDecl) 2297 return; 2298 2299 if (CXXConstructorDecl *Constructor 2300 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2301 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2302} 2303 2304bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2305 unsigned DiagID, AbstractDiagSelID SelID) { 2306 if (SelID == -1) 2307 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2308 else 2309 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2310} 2311 2312bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2313 const PartialDiagnostic &PD) { 2314 if (!getLangOptions().CPlusPlus) 2315 return false; 2316 2317 if (const ArrayType *AT = Context.getAsArrayType(T)) 2318 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2319 2320 if (const PointerType *PT = T->getAs<PointerType>()) { 2321 // Find the innermost pointer type. 2322 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2323 PT = T; 2324 2325 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2326 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2327 } 2328 2329 const RecordType *RT = T->getAs<RecordType>(); 2330 if (!RT) 2331 return false; 2332 2333 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2334 2335 // We can't answer whether something is abstract until it has a 2336 // definition. If it's currently being defined, we'll walk back 2337 // over all the declarations when we have a full definition. 2338 const CXXRecordDecl *Def = RD->getDefinition(); 2339 if (!Def || Def->isBeingDefined()) 2340 return false; 2341 2342 if (!RD->isAbstract()) 2343 return false; 2344 2345 Diag(Loc, PD) << RD->getDeclName(); 2346 DiagnoseAbstractType(RD); 2347 2348 return true; 2349} 2350 2351void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2352 // Check if we've already emitted the list of pure virtual functions 2353 // for this class. 2354 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2355 return; 2356 2357 CXXFinalOverriderMap FinalOverriders; 2358 RD->getFinalOverriders(FinalOverriders); 2359 2360 // Keep a set of seen pure methods so we won't diagnose the same method 2361 // more than once. 2362 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2363 2364 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2365 MEnd = FinalOverriders.end(); 2366 M != MEnd; 2367 ++M) { 2368 for (OverridingMethods::iterator SO = M->second.begin(), 2369 SOEnd = M->second.end(); 2370 SO != SOEnd; ++SO) { 2371 // C++ [class.abstract]p4: 2372 // A class is abstract if it contains or inherits at least one 2373 // pure virtual function for which the final overrider is pure 2374 // virtual. 2375 2376 // 2377 if (SO->second.size() != 1) 2378 continue; 2379 2380 if (!SO->second.front().Method->isPure()) 2381 continue; 2382 2383 if (!SeenPureMethods.insert(SO->second.front().Method)) 2384 continue; 2385 2386 Diag(SO->second.front().Method->getLocation(), 2387 diag::note_pure_virtual_function) 2388 << SO->second.front().Method->getDeclName(); 2389 } 2390 } 2391 2392 if (!PureVirtualClassDiagSet) 2393 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2394 PureVirtualClassDiagSet->insert(RD); 2395} 2396 2397namespace { 2398struct AbstractUsageInfo { 2399 Sema &S; 2400 CXXRecordDecl *Record; 2401 CanQualType AbstractType; 2402 bool Invalid; 2403 2404 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2405 : S(S), Record(Record), 2406 AbstractType(S.Context.getCanonicalType( 2407 S.Context.getTypeDeclType(Record))), 2408 Invalid(false) {} 2409 2410 void DiagnoseAbstractType() { 2411 if (Invalid) return; 2412 S.DiagnoseAbstractType(Record); 2413 Invalid = true; 2414 } 2415 2416 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2417}; 2418 2419struct CheckAbstractUsage { 2420 AbstractUsageInfo &Info; 2421 const NamedDecl *Ctx; 2422 2423 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2424 : Info(Info), Ctx(Ctx) {} 2425 2426 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2427 switch (TL.getTypeLocClass()) { 2428#define ABSTRACT_TYPELOC(CLASS, PARENT) 2429#define TYPELOC(CLASS, PARENT) \ 2430 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2431#include "clang/AST/TypeLocNodes.def" 2432 } 2433 } 2434 2435 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2436 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2437 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2438 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2439 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2440 } 2441 } 2442 2443 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2444 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2445 } 2446 2447 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2448 // Visit the type parameters from a permissive context. 2449 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2450 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2451 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2452 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2453 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2454 // TODO: other template argument types? 2455 } 2456 } 2457 2458 // Visit pointee types from a permissive context. 2459#define CheckPolymorphic(Type) \ 2460 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2461 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2462 } 2463 CheckPolymorphic(PointerTypeLoc) 2464 CheckPolymorphic(ReferenceTypeLoc) 2465 CheckPolymorphic(MemberPointerTypeLoc) 2466 CheckPolymorphic(BlockPointerTypeLoc) 2467 2468 /// Handle all the types we haven't given a more specific 2469 /// implementation for above. 2470 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2471 // Every other kind of type that we haven't called out already 2472 // that has an inner type is either (1) sugar or (2) contains that 2473 // inner type in some way as a subobject. 2474 if (TypeLoc Next = TL.getNextTypeLoc()) 2475 return Visit(Next, Sel); 2476 2477 // If there's no inner type and we're in a permissive context, 2478 // don't diagnose. 2479 if (Sel == Sema::AbstractNone) return; 2480 2481 // Check whether the type matches the abstract type. 2482 QualType T = TL.getType(); 2483 if (T->isArrayType()) { 2484 Sel = Sema::AbstractArrayType; 2485 T = Info.S.Context.getBaseElementType(T); 2486 } 2487 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2488 if (CT != Info.AbstractType) return; 2489 2490 // It matched; do some magic. 2491 if (Sel == Sema::AbstractArrayType) { 2492 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2493 << T << TL.getSourceRange(); 2494 } else { 2495 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2496 << Sel << T << TL.getSourceRange(); 2497 } 2498 Info.DiagnoseAbstractType(); 2499 } 2500}; 2501 2502void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2503 Sema::AbstractDiagSelID Sel) { 2504 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2505} 2506 2507} 2508 2509/// Check for invalid uses of an abstract type in a method declaration. 2510static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2511 CXXMethodDecl *MD) { 2512 // No need to do the check on definitions, which require that 2513 // the return/param types be complete. 2514 if (MD->isThisDeclarationADefinition()) 2515 return; 2516 2517 // For safety's sake, just ignore it if we don't have type source 2518 // information. This should never happen for non-implicit methods, 2519 // but... 2520 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2521 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2522} 2523 2524/// Check for invalid uses of an abstract type within a class definition. 2525static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2526 CXXRecordDecl *RD) { 2527 for (CXXRecordDecl::decl_iterator 2528 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2529 Decl *D = *I; 2530 if (D->isImplicit()) continue; 2531 2532 // Methods and method templates. 2533 if (isa<CXXMethodDecl>(D)) { 2534 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2535 } else if (isa<FunctionTemplateDecl>(D)) { 2536 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2537 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2538 2539 // Fields and static variables. 2540 } else if (isa<FieldDecl>(D)) { 2541 FieldDecl *FD = cast<FieldDecl>(D); 2542 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2543 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2544 } else if (isa<VarDecl>(D)) { 2545 VarDecl *VD = cast<VarDecl>(D); 2546 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2547 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2548 2549 // Nested classes and class templates. 2550 } else if (isa<CXXRecordDecl>(D)) { 2551 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2552 } else if (isa<ClassTemplateDecl>(D)) { 2553 CheckAbstractClassUsage(Info, 2554 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2555 } 2556 } 2557} 2558 2559/// \brief Perform semantic checks on a class definition that has been 2560/// completing, introducing implicitly-declared members, checking for 2561/// abstract types, etc. 2562void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2563 if (!Record) 2564 return; 2565 2566 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2567 AbstractUsageInfo Info(*this, Record); 2568 CheckAbstractClassUsage(Info, Record); 2569 } 2570 2571 // If this is not an aggregate type and has no user-declared constructor, 2572 // complain about any non-static data members of reference or const scalar 2573 // type, since they will never get initializers. 2574 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2575 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2576 bool Complained = false; 2577 for (RecordDecl::field_iterator F = Record->field_begin(), 2578 FEnd = Record->field_end(); 2579 F != FEnd; ++F) { 2580 if (F->getType()->isReferenceType() || 2581 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2582 if (!Complained) { 2583 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2584 << Record->getTagKind() << Record; 2585 Complained = true; 2586 } 2587 2588 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2589 << F->getType()->isReferenceType() 2590 << F->getDeclName(); 2591 } 2592 } 2593 } 2594 2595 if (Record->isDynamicClass()) 2596 DynamicClasses.push_back(Record); 2597 2598 if (Record->getIdentifier()) { 2599 // C++ [class.mem]p13: 2600 // If T is the name of a class, then each of the following shall have a 2601 // name different from T: 2602 // - every member of every anonymous union that is a member of class T. 2603 // 2604 // C++ [class.mem]p14: 2605 // In addition, if class T has a user-declared constructor (12.1), every 2606 // non-static data member of class T shall have a name different from T. 2607 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2608 R.first != R.second; ++R.first) { 2609 NamedDecl *D = *R.first; 2610 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2611 isa<IndirectFieldDecl>(D)) { 2612 Diag(D->getLocation(), diag::err_member_name_of_class) 2613 << D->getDeclName(); 2614 break; 2615 } 2616 } 2617 } 2618} 2619 2620void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2621 Decl *TagDecl, 2622 SourceLocation LBrac, 2623 SourceLocation RBrac, 2624 AttributeList *AttrList) { 2625 if (!TagDecl) 2626 return; 2627 2628 AdjustDeclIfTemplate(TagDecl); 2629 2630 ActOnFields(S, RLoc, TagDecl, 2631 // strict aliasing violation! 2632 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2633 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2634 2635 CheckCompletedCXXClass( 2636 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2637} 2638 2639namespace { 2640 /// \brief Helper class that collects exception specifications for 2641 /// implicitly-declared special member functions. 2642 class ImplicitExceptionSpecification { 2643 ASTContext &Context; 2644 bool AllowsAllExceptions; 2645 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2646 llvm::SmallVector<QualType, 4> Exceptions; 2647 2648 public: 2649 explicit ImplicitExceptionSpecification(ASTContext &Context) 2650 : Context(Context), AllowsAllExceptions(false) { } 2651 2652 /// \brief Whether the special member function should have any 2653 /// exception specification at all. 2654 bool hasExceptionSpecification() const { 2655 return !AllowsAllExceptions; 2656 } 2657 2658 /// \brief Whether the special member function should have a 2659 /// throw(...) exception specification (a Microsoft extension). 2660 bool hasAnyExceptionSpecification() const { 2661 return false; 2662 } 2663 2664 /// \brief The number of exceptions in the exception specification. 2665 unsigned size() const { return Exceptions.size(); } 2666 2667 /// \brief The set of exceptions in the exception specification. 2668 const QualType *data() const { return Exceptions.data(); } 2669 2670 /// \brief Note that 2671 void CalledDecl(CXXMethodDecl *Method) { 2672 // If we already know that we allow all exceptions, do nothing. 2673 if (AllowsAllExceptions || !Method) 2674 return; 2675 2676 const FunctionProtoType *Proto 2677 = Method->getType()->getAs<FunctionProtoType>(); 2678 2679 // If this function can throw any exceptions, make a note of that. 2680 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2681 AllowsAllExceptions = true; 2682 ExceptionsSeen.clear(); 2683 Exceptions.clear(); 2684 return; 2685 } 2686 2687 // Record the exceptions in this function's exception specification. 2688 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2689 EEnd = Proto->exception_end(); 2690 E != EEnd; ++E) 2691 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2692 Exceptions.push_back(*E); 2693 } 2694 }; 2695} 2696 2697 2698/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2699/// special functions, such as the default constructor, copy 2700/// constructor, or destructor, to the given C++ class (C++ 2701/// [special]p1). This routine can only be executed just before the 2702/// definition of the class is complete. 2703void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2704 if (!ClassDecl->hasUserDeclaredConstructor()) 2705 ++ASTContext::NumImplicitDefaultConstructors; 2706 2707 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2708 ++ASTContext::NumImplicitCopyConstructors; 2709 2710 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2711 ++ASTContext::NumImplicitCopyAssignmentOperators; 2712 2713 // If we have a dynamic class, then the copy assignment operator may be 2714 // virtual, so we have to declare it immediately. This ensures that, e.g., 2715 // it shows up in the right place in the vtable and that we diagnose 2716 // problems with the implicit exception specification. 2717 if (ClassDecl->isDynamicClass()) 2718 DeclareImplicitCopyAssignment(ClassDecl); 2719 } 2720 2721 if (!ClassDecl->hasUserDeclaredDestructor()) { 2722 ++ASTContext::NumImplicitDestructors; 2723 2724 // If we have a dynamic class, then the destructor may be virtual, so we 2725 // have to declare the destructor immediately. This ensures that, e.g., it 2726 // shows up in the right place in the vtable and that we diagnose problems 2727 // with the implicit exception specification. 2728 if (ClassDecl->isDynamicClass()) 2729 DeclareImplicitDestructor(ClassDecl); 2730 } 2731} 2732 2733void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2734 if (!D) 2735 return; 2736 2737 TemplateParameterList *Params = 0; 2738 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2739 Params = Template->getTemplateParameters(); 2740 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2741 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2742 Params = PartialSpec->getTemplateParameters(); 2743 else 2744 return; 2745 2746 for (TemplateParameterList::iterator Param = Params->begin(), 2747 ParamEnd = Params->end(); 2748 Param != ParamEnd; ++Param) { 2749 NamedDecl *Named = cast<NamedDecl>(*Param); 2750 if (Named->getDeclName()) { 2751 S->AddDecl(Named); 2752 IdResolver.AddDecl(Named); 2753 } 2754 } 2755} 2756 2757void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2758 if (!RecordD) return; 2759 AdjustDeclIfTemplate(RecordD); 2760 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2761 PushDeclContext(S, Record); 2762} 2763 2764void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2765 if (!RecordD) return; 2766 PopDeclContext(); 2767} 2768 2769/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2770/// parsing a top-level (non-nested) C++ class, and we are now 2771/// parsing those parts of the given Method declaration that could 2772/// not be parsed earlier (C++ [class.mem]p2), such as default 2773/// arguments. This action should enter the scope of the given 2774/// Method declaration as if we had just parsed the qualified method 2775/// name. However, it should not bring the parameters into scope; 2776/// that will be performed by ActOnDelayedCXXMethodParameter. 2777void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2778} 2779 2780/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2781/// C++ method declaration. We're (re-)introducing the given 2782/// function parameter into scope for use in parsing later parts of 2783/// the method declaration. For example, we could see an 2784/// ActOnParamDefaultArgument event for this parameter. 2785void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2786 if (!ParamD) 2787 return; 2788 2789 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2790 2791 // If this parameter has an unparsed default argument, clear it out 2792 // to make way for the parsed default argument. 2793 if (Param->hasUnparsedDefaultArg()) 2794 Param->setDefaultArg(0); 2795 2796 S->AddDecl(Param); 2797 if (Param->getDeclName()) 2798 IdResolver.AddDecl(Param); 2799} 2800 2801/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2802/// processing the delayed method declaration for Method. The method 2803/// declaration is now considered finished. There may be a separate 2804/// ActOnStartOfFunctionDef action later (not necessarily 2805/// immediately!) for this method, if it was also defined inside the 2806/// class body. 2807void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2808 if (!MethodD) 2809 return; 2810 2811 AdjustDeclIfTemplate(MethodD); 2812 2813 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2814 2815 // Now that we have our default arguments, check the constructor 2816 // again. It could produce additional diagnostics or affect whether 2817 // the class has implicitly-declared destructors, among other 2818 // things. 2819 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2820 CheckConstructor(Constructor); 2821 2822 // Check the default arguments, which we may have added. 2823 if (!Method->isInvalidDecl()) 2824 CheckCXXDefaultArguments(Method); 2825} 2826 2827/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2828/// the well-formedness of the constructor declarator @p D with type @p 2829/// R. If there are any errors in the declarator, this routine will 2830/// emit diagnostics and set the invalid bit to true. In any case, the type 2831/// will be updated to reflect a well-formed type for the constructor and 2832/// returned. 2833QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2834 StorageClass &SC) { 2835 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2836 2837 // C++ [class.ctor]p3: 2838 // A constructor shall not be virtual (10.3) or static (9.4). A 2839 // constructor can be invoked for a const, volatile or const 2840 // volatile object. A constructor shall not be declared const, 2841 // volatile, or const volatile (9.3.2). 2842 if (isVirtual) { 2843 if (!D.isInvalidType()) 2844 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2845 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2846 << SourceRange(D.getIdentifierLoc()); 2847 D.setInvalidType(); 2848 } 2849 if (SC == SC_Static) { 2850 if (!D.isInvalidType()) 2851 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2852 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2853 << SourceRange(D.getIdentifierLoc()); 2854 D.setInvalidType(); 2855 SC = SC_None; 2856 } 2857 2858 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2859 if (FTI.TypeQuals != 0) { 2860 if (FTI.TypeQuals & Qualifiers::Const) 2861 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2862 << "const" << SourceRange(D.getIdentifierLoc()); 2863 if (FTI.TypeQuals & Qualifiers::Volatile) 2864 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2865 << "volatile" << SourceRange(D.getIdentifierLoc()); 2866 if (FTI.TypeQuals & Qualifiers::Restrict) 2867 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2868 << "restrict" << SourceRange(D.getIdentifierLoc()); 2869 } 2870 2871 // Rebuild the function type "R" without any type qualifiers (in 2872 // case any of the errors above fired) and with "void" as the 2873 // return type, since constructors don't have return types. 2874 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2875 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2876 Proto->getNumArgs(), 2877 Proto->isVariadic(), 0, 2878 Proto->hasExceptionSpec(), 2879 Proto->hasAnyExceptionSpec(), 2880 Proto->getNumExceptions(), 2881 Proto->exception_begin(), 2882 Proto->getExtInfo()); 2883} 2884 2885/// CheckConstructor - Checks a fully-formed constructor for 2886/// well-formedness, issuing any diagnostics required. Returns true if 2887/// the constructor declarator is invalid. 2888void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2889 CXXRecordDecl *ClassDecl 2890 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2891 if (!ClassDecl) 2892 return Constructor->setInvalidDecl(); 2893 2894 // C++ [class.copy]p3: 2895 // A declaration of a constructor for a class X is ill-formed if 2896 // its first parameter is of type (optionally cv-qualified) X and 2897 // either there are no other parameters or else all other 2898 // parameters have default arguments. 2899 if (!Constructor->isInvalidDecl() && 2900 ((Constructor->getNumParams() == 1) || 2901 (Constructor->getNumParams() > 1 && 2902 Constructor->getParamDecl(1)->hasDefaultArg())) && 2903 Constructor->getTemplateSpecializationKind() 2904 != TSK_ImplicitInstantiation) { 2905 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2906 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2907 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2908 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2909 const char *ConstRef 2910 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2911 : " const &"; 2912 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2913 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2914 2915 // FIXME: Rather that making the constructor invalid, we should endeavor 2916 // to fix the type. 2917 Constructor->setInvalidDecl(); 2918 } 2919 } 2920} 2921 2922/// CheckDestructor - Checks a fully-formed destructor definition for 2923/// well-formedness, issuing any diagnostics required. Returns true 2924/// on error. 2925bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2926 CXXRecordDecl *RD = Destructor->getParent(); 2927 2928 if (Destructor->isVirtual()) { 2929 SourceLocation Loc; 2930 2931 if (!Destructor->isImplicit()) 2932 Loc = Destructor->getLocation(); 2933 else 2934 Loc = RD->getLocation(); 2935 2936 // If we have a virtual destructor, look up the deallocation function 2937 FunctionDecl *OperatorDelete = 0; 2938 DeclarationName Name = 2939 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2940 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2941 return true; 2942 2943 MarkDeclarationReferenced(Loc, OperatorDelete); 2944 2945 Destructor->setOperatorDelete(OperatorDelete); 2946 } 2947 2948 return false; 2949} 2950 2951static inline bool 2952FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2953 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2954 FTI.ArgInfo[0].Param && 2955 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 2956} 2957 2958/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2959/// the well-formednes of the destructor declarator @p D with type @p 2960/// R. If there are any errors in the declarator, this routine will 2961/// emit diagnostics and set the declarator to invalid. Even if this happens, 2962/// will be updated to reflect a well-formed type for the destructor and 2963/// returned. 2964QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2965 StorageClass& SC) { 2966 // C++ [class.dtor]p1: 2967 // [...] A typedef-name that names a class is a class-name 2968 // (7.1.3); however, a typedef-name that names a class shall not 2969 // be used as the identifier in the declarator for a destructor 2970 // declaration. 2971 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2972 if (isa<TypedefType>(DeclaratorType)) 2973 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2974 << DeclaratorType; 2975 2976 // C++ [class.dtor]p2: 2977 // A destructor is used to destroy objects of its class type. A 2978 // destructor takes no parameters, and no return type can be 2979 // specified for it (not even void). The address of a destructor 2980 // shall not be taken. A destructor shall not be static. A 2981 // destructor can be invoked for a const, volatile or const 2982 // volatile object. A destructor shall not be declared const, 2983 // volatile or const volatile (9.3.2). 2984 if (SC == SC_Static) { 2985 if (!D.isInvalidType()) 2986 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2987 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2988 << SourceRange(D.getIdentifierLoc()) 2989 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2990 2991 SC = SC_None; 2992 } 2993 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2994 // Destructors don't have return types, but the parser will 2995 // happily parse something like: 2996 // 2997 // class X { 2998 // float ~X(); 2999 // }; 3000 // 3001 // The return type will be eliminated later. 3002 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3003 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3004 << SourceRange(D.getIdentifierLoc()); 3005 } 3006 3007 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3008 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3009 if (FTI.TypeQuals & Qualifiers::Const) 3010 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3011 << "const" << SourceRange(D.getIdentifierLoc()); 3012 if (FTI.TypeQuals & Qualifiers::Volatile) 3013 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3014 << "volatile" << SourceRange(D.getIdentifierLoc()); 3015 if (FTI.TypeQuals & Qualifiers::Restrict) 3016 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3017 << "restrict" << SourceRange(D.getIdentifierLoc()); 3018 D.setInvalidType(); 3019 } 3020 3021 // Make sure we don't have any parameters. 3022 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3023 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3024 3025 // Delete the parameters. 3026 FTI.freeArgs(); 3027 D.setInvalidType(); 3028 } 3029 3030 // Make sure the destructor isn't variadic. 3031 if (FTI.isVariadic) { 3032 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3033 D.setInvalidType(); 3034 } 3035 3036 // Rebuild the function type "R" without any type qualifiers or 3037 // parameters (in case any of the errors above fired) and with 3038 // "void" as the return type, since destructors don't have return 3039 // types. 3040 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3041 if (!Proto) 3042 return QualType(); 3043 3044 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3045 Proto->hasExceptionSpec(), 3046 Proto->hasAnyExceptionSpec(), 3047 Proto->getNumExceptions(), 3048 Proto->exception_begin(), 3049 Proto->getExtInfo()); 3050} 3051 3052/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3053/// well-formednes of the conversion function declarator @p D with 3054/// type @p R. If there are any errors in the declarator, this routine 3055/// will emit diagnostics and return true. Otherwise, it will return 3056/// false. Either way, the type @p R will be updated to reflect a 3057/// well-formed type for the conversion operator. 3058void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3059 StorageClass& SC) { 3060 // C++ [class.conv.fct]p1: 3061 // Neither parameter types nor return type can be specified. The 3062 // type of a conversion function (8.3.5) is "function taking no 3063 // parameter returning conversion-type-id." 3064 if (SC == SC_Static) { 3065 if (!D.isInvalidType()) 3066 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3067 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3068 << SourceRange(D.getIdentifierLoc()); 3069 D.setInvalidType(); 3070 SC = SC_None; 3071 } 3072 3073 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3074 3075 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3076 // Conversion functions don't have return types, but the parser will 3077 // happily parse something like: 3078 // 3079 // class X { 3080 // float operator bool(); 3081 // }; 3082 // 3083 // The return type will be changed later anyway. 3084 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3085 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3086 << SourceRange(D.getIdentifierLoc()); 3087 D.setInvalidType(); 3088 } 3089 3090 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3091 3092 // Make sure we don't have any parameters. 3093 if (Proto->getNumArgs() > 0) { 3094 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3095 3096 // Delete the parameters. 3097 D.getTypeObject(0).Fun.freeArgs(); 3098 D.setInvalidType(); 3099 } else if (Proto->isVariadic()) { 3100 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3101 D.setInvalidType(); 3102 } 3103 3104 // Diagnose "&operator bool()" and other such nonsense. This 3105 // is actually a gcc extension which we don't support. 3106 if (Proto->getResultType() != ConvType) { 3107 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3108 << Proto->getResultType(); 3109 D.setInvalidType(); 3110 ConvType = Proto->getResultType(); 3111 } 3112 3113 // C++ [class.conv.fct]p4: 3114 // The conversion-type-id shall not represent a function type nor 3115 // an array type. 3116 if (ConvType->isArrayType()) { 3117 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3118 ConvType = Context.getPointerType(ConvType); 3119 D.setInvalidType(); 3120 } else if (ConvType->isFunctionType()) { 3121 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3122 ConvType = Context.getPointerType(ConvType); 3123 D.setInvalidType(); 3124 } 3125 3126 // Rebuild the function type "R" without any parameters (in case any 3127 // of the errors above fired) and with the conversion type as the 3128 // return type. 3129 if (D.isInvalidType()) { 3130 R = Context.getFunctionType(ConvType, 0, 0, false, 3131 Proto->getTypeQuals(), 3132 Proto->hasExceptionSpec(), 3133 Proto->hasAnyExceptionSpec(), 3134 Proto->getNumExceptions(), 3135 Proto->exception_begin(), 3136 Proto->getExtInfo()); 3137 } 3138 3139 // C++0x explicit conversion operators. 3140 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3141 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3142 diag::warn_explicit_conversion_functions) 3143 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3144} 3145 3146/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3147/// the declaration of the given C++ conversion function. This routine 3148/// is responsible for recording the conversion function in the C++ 3149/// class, if possible. 3150Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3151 assert(Conversion && "Expected to receive a conversion function declaration"); 3152 3153 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3154 3155 // Make sure we aren't redeclaring the conversion function. 3156 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3157 3158 // C++ [class.conv.fct]p1: 3159 // [...] A conversion function is never used to convert a 3160 // (possibly cv-qualified) object to the (possibly cv-qualified) 3161 // same object type (or a reference to it), to a (possibly 3162 // cv-qualified) base class of that type (or a reference to it), 3163 // or to (possibly cv-qualified) void. 3164 // FIXME: Suppress this warning if the conversion function ends up being a 3165 // virtual function that overrides a virtual function in a base class. 3166 QualType ClassType 3167 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3168 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3169 ConvType = ConvTypeRef->getPointeeType(); 3170 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3171 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3172 /* Suppress diagnostics for instantiations. */; 3173 else if (ConvType->isRecordType()) { 3174 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3175 if (ConvType == ClassType) 3176 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3177 << ClassType; 3178 else if (IsDerivedFrom(ClassType, ConvType)) 3179 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3180 << ClassType << ConvType; 3181 } else if (ConvType->isVoidType()) { 3182 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3183 << ClassType << ConvType; 3184 } 3185 3186 if (FunctionTemplateDecl *ConversionTemplate 3187 = Conversion->getDescribedFunctionTemplate()) 3188 return ConversionTemplate; 3189 3190 return Conversion; 3191} 3192 3193//===----------------------------------------------------------------------===// 3194// Namespace Handling 3195//===----------------------------------------------------------------------===// 3196 3197 3198 3199/// ActOnStartNamespaceDef - This is called at the start of a namespace 3200/// definition. 3201Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3202 SourceLocation InlineLoc, 3203 SourceLocation IdentLoc, 3204 IdentifierInfo *II, 3205 SourceLocation LBrace, 3206 AttributeList *AttrList) { 3207 // anonymous namespace starts at its left brace 3208 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3209 (II ? IdentLoc : LBrace) , II); 3210 Namespc->setLBracLoc(LBrace); 3211 Namespc->setInline(InlineLoc.isValid()); 3212 3213 Scope *DeclRegionScope = NamespcScope->getParent(); 3214 3215 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3216 3217 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3218 PushVisibilityAttr(attr); 3219 3220 if (II) { 3221 // C++ [namespace.def]p2: 3222 // The identifier in an original-namespace-definition shall not 3223 // have been previously defined in the declarative region in 3224 // which the original-namespace-definition appears. The 3225 // identifier in an original-namespace-definition is the name of 3226 // the namespace. Subsequently in that declarative region, it is 3227 // treated as an original-namespace-name. 3228 // 3229 // Since namespace names are unique in their scope, and we don't 3230 // look through using directives, just 3231 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3232 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3233 3234 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3235 // This is an extended namespace definition. 3236 if (Namespc->isInline() != OrigNS->isInline()) { 3237 // inline-ness must match 3238 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3239 << Namespc->isInline(); 3240 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3241 Namespc->setInvalidDecl(); 3242 // Recover by ignoring the new namespace's inline status. 3243 Namespc->setInline(OrigNS->isInline()); 3244 } 3245 3246 // Attach this namespace decl to the chain of extended namespace 3247 // definitions. 3248 OrigNS->setNextNamespace(Namespc); 3249 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3250 3251 // Remove the previous declaration from the scope. 3252 if (DeclRegionScope->isDeclScope(OrigNS)) { 3253 IdResolver.RemoveDecl(OrigNS); 3254 DeclRegionScope->RemoveDecl(OrigNS); 3255 } 3256 } else if (PrevDecl) { 3257 // This is an invalid name redefinition. 3258 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3259 << Namespc->getDeclName(); 3260 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3261 Namespc->setInvalidDecl(); 3262 // Continue on to push Namespc as current DeclContext and return it. 3263 } else if (II->isStr("std") && 3264 CurContext->getRedeclContext()->isTranslationUnit()) { 3265 // This is the first "real" definition of the namespace "std", so update 3266 // our cache of the "std" namespace to point at this definition. 3267 if (NamespaceDecl *StdNS = getStdNamespace()) { 3268 // We had already defined a dummy namespace "std". Link this new 3269 // namespace definition to the dummy namespace "std". 3270 StdNS->setNextNamespace(Namespc); 3271 StdNS->setLocation(IdentLoc); 3272 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3273 } 3274 3275 // Make our StdNamespace cache point at the first real definition of the 3276 // "std" namespace. 3277 StdNamespace = Namespc; 3278 } 3279 3280 PushOnScopeChains(Namespc, DeclRegionScope); 3281 } else { 3282 // Anonymous namespaces. 3283 assert(Namespc->isAnonymousNamespace()); 3284 3285 // Link the anonymous namespace into its parent. 3286 NamespaceDecl *PrevDecl; 3287 DeclContext *Parent = CurContext->getRedeclContext(); 3288 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3289 PrevDecl = TU->getAnonymousNamespace(); 3290 TU->setAnonymousNamespace(Namespc); 3291 } else { 3292 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3293 PrevDecl = ND->getAnonymousNamespace(); 3294 ND->setAnonymousNamespace(Namespc); 3295 } 3296 3297 // Link the anonymous namespace with its previous declaration. 3298 if (PrevDecl) { 3299 assert(PrevDecl->isAnonymousNamespace()); 3300 assert(!PrevDecl->getNextNamespace()); 3301 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3302 PrevDecl->setNextNamespace(Namespc); 3303 3304 if (Namespc->isInline() != PrevDecl->isInline()) { 3305 // inline-ness must match 3306 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3307 << Namespc->isInline(); 3308 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3309 Namespc->setInvalidDecl(); 3310 // Recover by ignoring the new namespace's inline status. 3311 Namespc->setInline(PrevDecl->isInline()); 3312 } 3313 } 3314 3315 CurContext->addDecl(Namespc); 3316 3317 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3318 // behaves as if it were replaced by 3319 // namespace unique { /* empty body */ } 3320 // using namespace unique; 3321 // namespace unique { namespace-body } 3322 // where all occurrences of 'unique' in a translation unit are 3323 // replaced by the same identifier and this identifier differs 3324 // from all other identifiers in the entire program. 3325 3326 // We just create the namespace with an empty name and then add an 3327 // implicit using declaration, just like the standard suggests. 3328 // 3329 // CodeGen enforces the "universally unique" aspect by giving all 3330 // declarations semantically contained within an anonymous 3331 // namespace internal linkage. 3332 3333 if (!PrevDecl) { 3334 UsingDirectiveDecl* UD 3335 = UsingDirectiveDecl::Create(Context, CurContext, 3336 /* 'using' */ LBrace, 3337 /* 'namespace' */ SourceLocation(), 3338 /* qualifier */ SourceRange(), 3339 /* NNS */ NULL, 3340 /* identifier */ SourceLocation(), 3341 Namespc, 3342 /* Ancestor */ CurContext); 3343 UD->setImplicit(); 3344 CurContext->addDecl(UD); 3345 } 3346 } 3347 3348 // Although we could have an invalid decl (i.e. the namespace name is a 3349 // redefinition), push it as current DeclContext and try to continue parsing. 3350 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3351 // for the namespace has the declarations that showed up in that particular 3352 // namespace definition. 3353 PushDeclContext(NamespcScope, Namespc); 3354 return Namespc; 3355} 3356 3357/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3358/// is a namespace alias, returns the namespace it points to. 3359static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3360 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3361 return AD->getNamespace(); 3362 return dyn_cast_or_null<NamespaceDecl>(D); 3363} 3364 3365/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3366/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3367void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3368 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3369 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3370 Namespc->setRBracLoc(RBrace); 3371 PopDeclContext(); 3372 if (Namespc->hasAttr<VisibilityAttr>()) 3373 PopPragmaVisibility(); 3374} 3375 3376CXXRecordDecl *Sema::getStdBadAlloc() const { 3377 return cast_or_null<CXXRecordDecl>( 3378 StdBadAlloc.get(Context.getExternalSource())); 3379} 3380 3381NamespaceDecl *Sema::getStdNamespace() const { 3382 return cast_or_null<NamespaceDecl>( 3383 StdNamespace.get(Context.getExternalSource())); 3384} 3385 3386/// \brief Retrieve the special "std" namespace, which may require us to 3387/// implicitly define the namespace. 3388NamespaceDecl *Sema::getOrCreateStdNamespace() { 3389 if (!StdNamespace) { 3390 // The "std" namespace has not yet been defined, so build one implicitly. 3391 StdNamespace = NamespaceDecl::Create(Context, 3392 Context.getTranslationUnitDecl(), 3393 SourceLocation(), 3394 &PP.getIdentifierTable().get("std")); 3395 getStdNamespace()->setImplicit(true); 3396 } 3397 3398 return getStdNamespace(); 3399} 3400 3401Decl *Sema::ActOnUsingDirective(Scope *S, 3402 SourceLocation UsingLoc, 3403 SourceLocation NamespcLoc, 3404 CXXScopeSpec &SS, 3405 SourceLocation IdentLoc, 3406 IdentifierInfo *NamespcName, 3407 AttributeList *AttrList) { 3408 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3409 assert(NamespcName && "Invalid NamespcName."); 3410 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3411 3412 // This can only happen along a recovery path. 3413 while (S->getFlags() & Scope::TemplateParamScope) 3414 S = S->getParent(); 3415 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3416 3417 UsingDirectiveDecl *UDir = 0; 3418 NestedNameSpecifier *Qualifier = 0; 3419 if (SS.isSet()) 3420 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3421 3422 // Lookup namespace name. 3423 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3424 LookupParsedName(R, S, &SS); 3425 if (R.isAmbiguous()) 3426 return 0; 3427 3428 if (R.empty()) { 3429 // Allow "using namespace std;" or "using namespace ::std;" even if 3430 // "std" hasn't been defined yet, for GCC compatibility. 3431 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3432 NamespcName->isStr("std")) { 3433 Diag(IdentLoc, diag::ext_using_undefined_std); 3434 R.addDecl(getOrCreateStdNamespace()); 3435 R.resolveKind(); 3436 } 3437 // Otherwise, attempt typo correction. 3438 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3439 CTC_NoKeywords, 0)) { 3440 if (R.getAsSingle<NamespaceDecl>() || 3441 R.getAsSingle<NamespaceAliasDecl>()) { 3442 if (DeclContext *DC = computeDeclContext(SS, false)) 3443 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3444 << NamespcName << DC << Corrected << SS.getRange() 3445 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3446 else 3447 Diag(IdentLoc, diag::err_using_directive_suggest) 3448 << NamespcName << Corrected 3449 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3450 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3451 << Corrected; 3452 3453 NamespcName = Corrected.getAsIdentifierInfo(); 3454 } else { 3455 R.clear(); 3456 R.setLookupName(NamespcName); 3457 } 3458 } 3459 } 3460 3461 if (!R.empty()) { 3462 NamedDecl *Named = R.getFoundDecl(); 3463 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3464 && "expected namespace decl"); 3465 // C++ [namespace.udir]p1: 3466 // A using-directive specifies that the names in the nominated 3467 // namespace can be used in the scope in which the 3468 // using-directive appears after the using-directive. During 3469 // unqualified name lookup (3.4.1), the names appear as if they 3470 // were declared in the nearest enclosing namespace which 3471 // contains both the using-directive and the nominated 3472 // namespace. [Note: in this context, "contains" means "contains 3473 // directly or indirectly". ] 3474 3475 // Find enclosing context containing both using-directive and 3476 // nominated namespace. 3477 NamespaceDecl *NS = getNamespaceDecl(Named); 3478 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3479 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3480 CommonAncestor = CommonAncestor->getParent(); 3481 3482 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3483 SS.getRange(), 3484 (NestedNameSpecifier *)SS.getScopeRep(), 3485 IdentLoc, Named, CommonAncestor); 3486 PushUsingDirective(S, UDir); 3487 } else { 3488 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3489 } 3490 3491 // FIXME: We ignore attributes for now. 3492 return UDir; 3493} 3494 3495void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3496 // If scope has associated entity, then using directive is at namespace 3497 // or translation unit scope. We add UsingDirectiveDecls, into 3498 // it's lookup structure. 3499 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3500 Ctx->addDecl(UDir); 3501 else 3502 // Otherwise it is block-sope. using-directives will affect lookup 3503 // only to the end of scope. 3504 S->PushUsingDirective(UDir); 3505} 3506 3507 3508Decl *Sema::ActOnUsingDeclaration(Scope *S, 3509 AccessSpecifier AS, 3510 bool HasUsingKeyword, 3511 SourceLocation UsingLoc, 3512 CXXScopeSpec &SS, 3513 UnqualifiedId &Name, 3514 AttributeList *AttrList, 3515 bool IsTypeName, 3516 SourceLocation TypenameLoc) { 3517 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3518 3519 switch (Name.getKind()) { 3520 case UnqualifiedId::IK_Identifier: 3521 case UnqualifiedId::IK_OperatorFunctionId: 3522 case UnqualifiedId::IK_LiteralOperatorId: 3523 case UnqualifiedId::IK_ConversionFunctionId: 3524 break; 3525 3526 case UnqualifiedId::IK_ConstructorName: 3527 case UnqualifiedId::IK_ConstructorTemplateId: 3528 // C++0x inherited constructors. 3529 if (getLangOptions().CPlusPlus0x) break; 3530 3531 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3532 << SS.getRange(); 3533 return 0; 3534 3535 case UnqualifiedId::IK_DestructorName: 3536 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3537 << SS.getRange(); 3538 return 0; 3539 3540 case UnqualifiedId::IK_TemplateId: 3541 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3542 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3543 return 0; 3544 } 3545 3546 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3547 DeclarationName TargetName = TargetNameInfo.getName(); 3548 if (!TargetName) 3549 return 0; 3550 3551 // Warn about using declarations. 3552 // TODO: store that the declaration was written without 'using' and 3553 // talk about access decls instead of using decls in the 3554 // diagnostics. 3555 if (!HasUsingKeyword) { 3556 UsingLoc = Name.getSourceRange().getBegin(); 3557 3558 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3559 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3560 } 3561 3562 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3563 TargetNameInfo, AttrList, 3564 /* IsInstantiation */ false, 3565 IsTypeName, TypenameLoc); 3566 if (UD) 3567 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3568 3569 return UD; 3570} 3571 3572/// \brief Determine whether a using declaration considers the given 3573/// declarations as "equivalent", e.g., if they are redeclarations of 3574/// the same entity or are both typedefs of the same type. 3575static bool 3576IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3577 bool &SuppressRedeclaration) { 3578 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3579 SuppressRedeclaration = false; 3580 return true; 3581 } 3582 3583 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3584 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3585 SuppressRedeclaration = true; 3586 return Context.hasSameType(TD1->getUnderlyingType(), 3587 TD2->getUnderlyingType()); 3588 } 3589 3590 return false; 3591} 3592 3593 3594/// Determines whether to create a using shadow decl for a particular 3595/// decl, given the set of decls existing prior to this using lookup. 3596bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3597 const LookupResult &Previous) { 3598 // Diagnose finding a decl which is not from a base class of the 3599 // current class. We do this now because there are cases where this 3600 // function will silently decide not to build a shadow decl, which 3601 // will pre-empt further diagnostics. 3602 // 3603 // We don't need to do this in C++0x because we do the check once on 3604 // the qualifier. 3605 // 3606 // FIXME: diagnose the following if we care enough: 3607 // struct A { int foo; }; 3608 // struct B : A { using A::foo; }; 3609 // template <class T> struct C : A {}; 3610 // template <class T> struct D : C<T> { using B::foo; } // <--- 3611 // This is invalid (during instantiation) in C++03 because B::foo 3612 // resolves to the using decl in B, which is not a base class of D<T>. 3613 // We can't diagnose it immediately because C<T> is an unknown 3614 // specialization. The UsingShadowDecl in D<T> then points directly 3615 // to A::foo, which will look well-formed when we instantiate. 3616 // The right solution is to not collapse the shadow-decl chain. 3617 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3618 DeclContext *OrigDC = Orig->getDeclContext(); 3619 3620 // Handle enums and anonymous structs. 3621 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3622 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3623 while (OrigRec->isAnonymousStructOrUnion()) 3624 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3625 3626 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3627 if (OrigDC == CurContext) { 3628 Diag(Using->getLocation(), 3629 diag::err_using_decl_nested_name_specifier_is_current_class) 3630 << Using->getNestedNameRange(); 3631 Diag(Orig->getLocation(), diag::note_using_decl_target); 3632 return true; 3633 } 3634 3635 Diag(Using->getNestedNameRange().getBegin(), 3636 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3637 << Using->getTargetNestedNameDecl() 3638 << cast<CXXRecordDecl>(CurContext) 3639 << Using->getNestedNameRange(); 3640 Diag(Orig->getLocation(), diag::note_using_decl_target); 3641 return true; 3642 } 3643 } 3644 3645 if (Previous.empty()) return false; 3646 3647 NamedDecl *Target = Orig; 3648 if (isa<UsingShadowDecl>(Target)) 3649 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3650 3651 // If the target happens to be one of the previous declarations, we 3652 // don't have a conflict. 3653 // 3654 // FIXME: but we might be increasing its access, in which case we 3655 // should redeclare it. 3656 NamedDecl *NonTag = 0, *Tag = 0; 3657 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3658 I != E; ++I) { 3659 NamedDecl *D = (*I)->getUnderlyingDecl(); 3660 bool Result; 3661 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3662 return Result; 3663 3664 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3665 } 3666 3667 if (Target->isFunctionOrFunctionTemplate()) { 3668 FunctionDecl *FD; 3669 if (isa<FunctionTemplateDecl>(Target)) 3670 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3671 else 3672 FD = cast<FunctionDecl>(Target); 3673 3674 NamedDecl *OldDecl = 0; 3675 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3676 case Ovl_Overload: 3677 return false; 3678 3679 case Ovl_NonFunction: 3680 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3681 break; 3682 3683 // We found a decl with the exact signature. 3684 case Ovl_Match: 3685 // If we're in a record, we want to hide the target, so we 3686 // return true (without a diagnostic) to tell the caller not to 3687 // build a shadow decl. 3688 if (CurContext->isRecord()) 3689 return true; 3690 3691 // If we're not in a record, this is an error. 3692 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3693 break; 3694 } 3695 3696 Diag(Target->getLocation(), diag::note_using_decl_target); 3697 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3698 return true; 3699 } 3700 3701 // Target is not a function. 3702 3703 if (isa<TagDecl>(Target)) { 3704 // No conflict between a tag and a non-tag. 3705 if (!Tag) return false; 3706 3707 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3708 Diag(Target->getLocation(), diag::note_using_decl_target); 3709 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3710 return true; 3711 } 3712 3713 // No conflict between a tag and a non-tag. 3714 if (!NonTag) return false; 3715 3716 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3717 Diag(Target->getLocation(), diag::note_using_decl_target); 3718 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3719 return true; 3720} 3721 3722/// Builds a shadow declaration corresponding to a 'using' declaration. 3723UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3724 UsingDecl *UD, 3725 NamedDecl *Orig) { 3726 3727 // If we resolved to another shadow declaration, just coalesce them. 3728 NamedDecl *Target = Orig; 3729 if (isa<UsingShadowDecl>(Target)) { 3730 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3731 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3732 } 3733 3734 UsingShadowDecl *Shadow 3735 = UsingShadowDecl::Create(Context, CurContext, 3736 UD->getLocation(), UD, Target); 3737 UD->addShadowDecl(Shadow); 3738 3739 Shadow->setAccess(UD->getAccess()); 3740 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3741 Shadow->setInvalidDecl(); 3742 3743 if (S) 3744 PushOnScopeChains(Shadow, S); 3745 else 3746 CurContext->addDecl(Shadow); 3747 3748 3749 return Shadow; 3750} 3751 3752/// Hides a using shadow declaration. This is required by the current 3753/// using-decl implementation when a resolvable using declaration in a 3754/// class is followed by a declaration which would hide or override 3755/// one or more of the using decl's targets; for example: 3756/// 3757/// struct Base { void foo(int); }; 3758/// struct Derived : Base { 3759/// using Base::foo; 3760/// void foo(int); 3761/// }; 3762/// 3763/// The governing language is C++03 [namespace.udecl]p12: 3764/// 3765/// When a using-declaration brings names from a base class into a 3766/// derived class scope, member functions in the derived class 3767/// override and/or hide member functions with the same name and 3768/// parameter types in a base class (rather than conflicting). 3769/// 3770/// There are two ways to implement this: 3771/// (1) optimistically create shadow decls when they're not hidden 3772/// by existing declarations, or 3773/// (2) don't create any shadow decls (or at least don't make them 3774/// visible) until we've fully parsed/instantiated the class. 3775/// The problem with (1) is that we might have to retroactively remove 3776/// a shadow decl, which requires several O(n) operations because the 3777/// decl structures are (very reasonably) not designed for removal. 3778/// (2) avoids this but is very fiddly and phase-dependent. 3779void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3780 if (Shadow->getDeclName().getNameKind() == 3781 DeclarationName::CXXConversionFunctionName) 3782 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3783 3784 // Remove it from the DeclContext... 3785 Shadow->getDeclContext()->removeDecl(Shadow); 3786 3787 // ...and the scope, if applicable... 3788 if (S) { 3789 S->RemoveDecl(Shadow); 3790 IdResolver.RemoveDecl(Shadow); 3791 } 3792 3793 // ...and the using decl. 3794 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3795 3796 // TODO: complain somehow if Shadow was used. It shouldn't 3797 // be possible for this to happen, because...? 3798} 3799 3800/// Builds a using declaration. 3801/// 3802/// \param IsInstantiation - Whether this call arises from an 3803/// instantiation of an unresolved using declaration. We treat 3804/// the lookup differently for these declarations. 3805NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3806 SourceLocation UsingLoc, 3807 CXXScopeSpec &SS, 3808 const DeclarationNameInfo &NameInfo, 3809 AttributeList *AttrList, 3810 bool IsInstantiation, 3811 bool IsTypeName, 3812 SourceLocation TypenameLoc) { 3813 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3814 SourceLocation IdentLoc = NameInfo.getLoc(); 3815 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3816 3817 // FIXME: We ignore attributes for now. 3818 3819 if (SS.isEmpty()) { 3820 Diag(IdentLoc, diag::err_using_requires_qualname); 3821 return 0; 3822 } 3823 3824 // Do the redeclaration lookup in the current scope. 3825 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3826 ForRedeclaration); 3827 Previous.setHideTags(false); 3828 if (S) { 3829 LookupName(Previous, S); 3830 3831 // It is really dumb that we have to do this. 3832 LookupResult::Filter F = Previous.makeFilter(); 3833 while (F.hasNext()) { 3834 NamedDecl *D = F.next(); 3835 if (!isDeclInScope(D, CurContext, S)) 3836 F.erase(); 3837 } 3838 F.done(); 3839 } else { 3840 assert(IsInstantiation && "no scope in non-instantiation"); 3841 assert(CurContext->isRecord() && "scope not record in instantiation"); 3842 LookupQualifiedName(Previous, CurContext); 3843 } 3844 3845 NestedNameSpecifier *NNS = 3846 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3847 3848 // Check for invalid redeclarations. 3849 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3850 return 0; 3851 3852 // Check for bad qualifiers. 3853 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3854 return 0; 3855 3856 DeclContext *LookupContext = computeDeclContext(SS); 3857 NamedDecl *D; 3858 if (!LookupContext) { 3859 if (IsTypeName) { 3860 // FIXME: not all declaration name kinds are legal here 3861 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3862 UsingLoc, TypenameLoc, 3863 SS.getRange(), NNS, 3864 IdentLoc, NameInfo.getName()); 3865 } else { 3866 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3867 UsingLoc, SS.getRange(), 3868 NNS, NameInfo); 3869 } 3870 } else { 3871 D = UsingDecl::Create(Context, CurContext, 3872 SS.getRange(), UsingLoc, NNS, NameInfo, 3873 IsTypeName); 3874 } 3875 D->setAccess(AS); 3876 CurContext->addDecl(D); 3877 3878 if (!LookupContext) return D; 3879 UsingDecl *UD = cast<UsingDecl>(D); 3880 3881 if (RequireCompleteDeclContext(SS, LookupContext)) { 3882 UD->setInvalidDecl(); 3883 return UD; 3884 } 3885 3886 // Look up the target name. 3887 3888 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3889 3890 // Unlike most lookups, we don't always want to hide tag 3891 // declarations: tag names are visible through the using declaration 3892 // even if hidden by ordinary names, *except* in a dependent context 3893 // where it's important for the sanity of two-phase lookup. 3894 if (!IsInstantiation) 3895 R.setHideTags(false); 3896 3897 LookupQualifiedName(R, LookupContext); 3898 3899 if (R.empty()) { 3900 Diag(IdentLoc, diag::err_no_member) 3901 << NameInfo.getName() << LookupContext << SS.getRange(); 3902 UD->setInvalidDecl(); 3903 return UD; 3904 } 3905 3906 if (R.isAmbiguous()) { 3907 UD->setInvalidDecl(); 3908 return UD; 3909 } 3910 3911 if (IsTypeName) { 3912 // If we asked for a typename and got a non-type decl, error out. 3913 if (!R.getAsSingle<TypeDecl>()) { 3914 Diag(IdentLoc, diag::err_using_typename_non_type); 3915 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3916 Diag((*I)->getUnderlyingDecl()->getLocation(), 3917 diag::note_using_decl_target); 3918 UD->setInvalidDecl(); 3919 return UD; 3920 } 3921 } else { 3922 // If we asked for a non-typename and we got a type, error out, 3923 // but only if this is an instantiation of an unresolved using 3924 // decl. Otherwise just silently find the type name. 3925 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3926 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3927 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3928 UD->setInvalidDecl(); 3929 return UD; 3930 } 3931 } 3932 3933 // C++0x N2914 [namespace.udecl]p6: 3934 // A using-declaration shall not name a namespace. 3935 if (R.getAsSingle<NamespaceDecl>()) { 3936 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3937 << SS.getRange(); 3938 UD->setInvalidDecl(); 3939 return UD; 3940 } 3941 3942 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3943 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3944 BuildUsingShadowDecl(S, UD, *I); 3945 } 3946 3947 return UD; 3948} 3949 3950/// Checks that the given using declaration is not an invalid 3951/// redeclaration. Note that this is checking only for the using decl 3952/// itself, not for any ill-formedness among the UsingShadowDecls. 3953bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3954 bool isTypeName, 3955 const CXXScopeSpec &SS, 3956 SourceLocation NameLoc, 3957 const LookupResult &Prev) { 3958 // C++03 [namespace.udecl]p8: 3959 // C++0x [namespace.udecl]p10: 3960 // A using-declaration is a declaration and can therefore be used 3961 // repeatedly where (and only where) multiple declarations are 3962 // allowed. 3963 // 3964 // That's in non-member contexts. 3965 if (!CurContext->getRedeclContext()->isRecord()) 3966 return false; 3967 3968 NestedNameSpecifier *Qual 3969 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3970 3971 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3972 NamedDecl *D = *I; 3973 3974 bool DTypename; 3975 NestedNameSpecifier *DQual; 3976 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3977 DTypename = UD->isTypeName(); 3978 DQual = UD->getTargetNestedNameDecl(); 3979 } else if (UnresolvedUsingValueDecl *UD 3980 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3981 DTypename = false; 3982 DQual = UD->getTargetNestedNameSpecifier(); 3983 } else if (UnresolvedUsingTypenameDecl *UD 3984 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3985 DTypename = true; 3986 DQual = UD->getTargetNestedNameSpecifier(); 3987 } else continue; 3988 3989 // using decls differ if one says 'typename' and the other doesn't. 3990 // FIXME: non-dependent using decls? 3991 if (isTypeName != DTypename) continue; 3992 3993 // using decls differ if they name different scopes (but note that 3994 // template instantiation can cause this check to trigger when it 3995 // didn't before instantiation). 3996 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3997 Context.getCanonicalNestedNameSpecifier(DQual)) 3998 continue; 3999 4000 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4001 Diag(D->getLocation(), diag::note_using_decl) << 1; 4002 return true; 4003 } 4004 4005 return false; 4006} 4007 4008 4009/// Checks that the given nested-name qualifier used in a using decl 4010/// in the current context is appropriately related to the current 4011/// scope. If an error is found, diagnoses it and returns true. 4012bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4013 const CXXScopeSpec &SS, 4014 SourceLocation NameLoc) { 4015 DeclContext *NamedContext = computeDeclContext(SS); 4016 4017 if (!CurContext->isRecord()) { 4018 // C++03 [namespace.udecl]p3: 4019 // C++0x [namespace.udecl]p8: 4020 // A using-declaration for a class member shall be a member-declaration. 4021 4022 // If we weren't able to compute a valid scope, it must be a 4023 // dependent class scope. 4024 if (!NamedContext || NamedContext->isRecord()) { 4025 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4026 << SS.getRange(); 4027 return true; 4028 } 4029 4030 // Otherwise, everything is known to be fine. 4031 return false; 4032 } 4033 4034 // The current scope is a record. 4035 4036 // If the named context is dependent, we can't decide much. 4037 if (!NamedContext) { 4038 // FIXME: in C++0x, we can diagnose if we can prove that the 4039 // nested-name-specifier does not refer to a base class, which is 4040 // still possible in some cases. 4041 4042 // Otherwise we have to conservatively report that things might be 4043 // okay. 4044 return false; 4045 } 4046 4047 if (!NamedContext->isRecord()) { 4048 // Ideally this would point at the last name in the specifier, 4049 // but we don't have that level of source info. 4050 Diag(SS.getRange().getBegin(), 4051 diag::err_using_decl_nested_name_specifier_is_not_class) 4052 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4053 return true; 4054 } 4055 4056 if (getLangOptions().CPlusPlus0x) { 4057 // C++0x [namespace.udecl]p3: 4058 // In a using-declaration used as a member-declaration, the 4059 // nested-name-specifier shall name a base class of the class 4060 // being defined. 4061 4062 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4063 cast<CXXRecordDecl>(NamedContext))) { 4064 if (CurContext == NamedContext) { 4065 Diag(NameLoc, 4066 diag::err_using_decl_nested_name_specifier_is_current_class) 4067 << SS.getRange(); 4068 return true; 4069 } 4070 4071 Diag(SS.getRange().getBegin(), 4072 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4073 << (NestedNameSpecifier*) SS.getScopeRep() 4074 << cast<CXXRecordDecl>(CurContext) 4075 << SS.getRange(); 4076 return true; 4077 } 4078 4079 return false; 4080 } 4081 4082 // C++03 [namespace.udecl]p4: 4083 // A using-declaration used as a member-declaration shall refer 4084 // to a member of a base class of the class being defined [etc.]. 4085 4086 // Salient point: SS doesn't have to name a base class as long as 4087 // lookup only finds members from base classes. Therefore we can 4088 // diagnose here only if we can prove that that can't happen, 4089 // i.e. if the class hierarchies provably don't intersect. 4090 4091 // TODO: it would be nice if "definitely valid" results were cached 4092 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4093 // need to be repeated. 4094 4095 struct UserData { 4096 llvm::DenseSet<const CXXRecordDecl*> Bases; 4097 4098 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4099 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4100 Data->Bases.insert(Base); 4101 return true; 4102 } 4103 4104 bool hasDependentBases(const CXXRecordDecl *Class) { 4105 return !Class->forallBases(collect, this); 4106 } 4107 4108 /// Returns true if the base is dependent or is one of the 4109 /// accumulated base classes. 4110 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4111 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4112 return !Data->Bases.count(Base); 4113 } 4114 4115 bool mightShareBases(const CXXRecordDecl *Class) { 4116 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4117 } 4118 }; 4119 4120 UserData Data; 4121 4122 // Returns false if we find a dependent base. 4123 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4124 return false; 4125 4126 // Returns false if the class has a dependent base or if it or one 4127 // of its bases is present in the base set of the current context. 4128 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4129 return false; 4130 4131 Diag(SS.getRange().getBegin(), 4132 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4133 << (NestedNameSpecifier*) SS.getScopeRep() 4134 << cast<CXXRecordDecl>(CurContext) 4135 << SS.getRange(); 4136 4137 return true; 4138} 4139 4140Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4141 SourceLocation NamespaceLoc, 4142 SourceLocation AliasLoc, 4143 IdentifierInfo *Alias, 4144 CXXScopeSpec &SS, 4145 SourceLocation IdentLoc, 4146 IdentifierInfo *Ident) { 4147 4148 // Lookup the namespace name. 4149 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4150 LookupParsedName(R, S, &SS); 4151 4152 // Check if we have a previous declaration with the same name. 4153 NamedDecl *PrevDecl 4154 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4155 ForRedeclaration); 4156 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4157 PrevDecl = 0; 4158 4159 if (PrevDecl) { 4160 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4161 // We already have an alias with the same name that points to the same 4162 // namespace, so don't create a new one. 4163 // FIXME: At some point, we'll want to create the (redundant) 4164 // declaration to maintain better source information. 4165 if (!R.isAmbiguous() && !R.empty() && 4166 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4167 return 0; 4168 } 4169 4170 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4171 diag::err_redefinition_different_kind; 4172 Diag(AliasLoc, DiagID) << Alias; 4173 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4174 return 0; 4175 } 4176 4177 if (R.isAmbiguous()) 4178 return 0; 4179 4180 if (R.empty()) { 4181 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4182 CTC_NoKeywords, 0)) { 4183 if (R.getAsSingle<NamespaceDecl>() || 4184 R.getAsSingle<NamespaceAliasDecl>()) { 4185 if (DeclContext *DC = computeDeclContext(SS, false)) 4186 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4187 << Ident << DC << Corrected << SS.getRange() 4188 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4189 else 4190 Diag(IdentLoc, diag::err_using_directive_suggest) 4191 << Ident << Corrected 4192 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4193 4194 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4195 << Corrected; 4196 4197 Ident = Corrected.getAsIdentifierInfo(); 4198 } else { 4199 R.clear(); 4200 R.setLookupName(Ident); 4201 } 4202 } 4203 4204 if (R.empty()) { 4205 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4206 return 0; 4207 } 4208 } 4209 4210 NamespaceAliasDecl *AliasDecl = 4211 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4212 Alias, SS.getRange(), 4213 (NestedNameSpecifier *)SS.getScopeRep(), 4214 IdentLoc, R.getFoundDecl()); 4215 4216 PushOnScopeChains(AliasDecl, S); 4217 return AliasDecl; 4218} 4219 4220namespace { 4221 /// \brief Scoped object used to handle the state changes required in Sema 4222 /// to implicitly define the body of a C++ member function; 4223 class ImplicitlyDefinedFunctionScope { 4224 Sema &S; 4225 DeclContext *PreviousContext; 4226 4227 public: 4228 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4229 : S(S), PreviousContext(S.CurContext) 4230 { 4231 S.CurContext = Method; 4232 S.PushFunctionScope(); 4233 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4234 } 4235 4236 ~ImplicitlyDefinedFunctionScope() { 4237 S.PopExpressionEvaluationContext(); 4238 S.PopFunctionOrBlockScope(); 4239 S.CurContext = PreviousContext; 4240 } 4241 }; 4242} 4243 4244static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4245 CXXRecordDecl *D) { 4246 ASTContext &Context = Self.Context; 4247 QualType ClassType = Context.getTypeDeclType(D); 4248 DeclarationName ConstructorName 4249 = Context.DeclarationNames.getCXXConstructorName( 4250 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4251 4252 DeclContext::lookup_const_iterator Con, ConEnd; 4253 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4254 Con != ConEnd; ++Con) { 4255 // FIXME: In C++0x, a constructor template can be a default constructor. 4256 if (isa<FunctionTemplateDecl>(*Con)) 4257 continue; 4258 4259 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4260 if (Constructor->isDefaultConstructor()) 4261 return Constructor; 4262 } 4263 return 0; 4264} 4265 4266CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4267 CXXRecordDecl *ClassDecl) { 4268 // C++ [class.ctor]p5: 4269 // A default constructor for a class X is a constructor of class X 4270 // that can be called without an argument. If there is no 4271 // user-declared constructor for class X, a default constructor is 4272 // implicitly declared. An implicitly-declared default constructor 4273 // is an inline public member of its class. 4274 assert(!ClassDecl->hasUserDeclaredConstructor() && 4275 "Should not build implicit default constructor!"); 4276 4277 // C++ [except.spec]p14: 4278 // An implicitly declared special member function (Clause 12) shall have an 4279 // exception-specification. [...] 4280 ImplicitExceptionSpecification ExceptSpec(Context); 4281 4282 // Direct base-class destructors. 4283 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4284 BEnd = ClassDecl->bases_end(); 4285 B != BEnd; ++B) { 4286 if (B->isVirtual()) // Handled below. 4287 continue; 4288 4289 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4290 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4291 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4292 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4293 else if (CXXConstructorDecl *Constructor 4294 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4295 ExceptSpec.CalledDecl(Constructor); 4296 } 4297 } 4298 4299 // Virtual base-class destructors. 4300 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4301 BEnd = ClassDecl->vbases_end(); 4302 B != BEnd; ++B) { 4303 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4304 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4305 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4306 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4307 else if (CXXConstructorDecl *Constructor 4308 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4309 ExceptSpec.CalledDecl(Constructor); 4310 } 4311 } 4312 4313 // Field destructors. 4314 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4315 FEnd = ClassDecl->field_end(); 4316 F != FEnd; ++F) { 4317 if (const RecordType *RecordTy 4318 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4319 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4320 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4321 ExceptSpec.CalledDecl( 4322 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4323 else if (CXXConstructorDecl *Constructor 4324 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4325 ExceptSpec.CalledDecl(Constructor); 4326 } 4327 } 4328 4329 4330 // Create the actual constructor declaration. 4331 CanQualType ClassType 4332 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4333 DeclarationName Name 4334 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4335 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4336 CXXConstructorDecl *DefaultCon 4337 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4338 Context.getFunctionType(Context.VoidTy, 4339 0, 0, false, 0, 4340 ExceptSpec.hasExceptionSpecification(), 4341 ExceptSpec.hasAnyExceptionSpecification(), 4342 ExceptSpec.size(), 4343 ExceptSpec.data(), 4344 FunctionType::ExtInfo()), 4345 /*TInfo=*/0, 4346 /*isExplicit=*/false, 4347 /*isInline=*/true, 4348 /*isImplicitlyDeclared=*/true); 4349 DefaultCon->setAccess(AS_public); 4350 DefaultCon->setImplicit(); 4351 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4352 4353 // Note that we have declared this constructor. 4354 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4355 4356 if (Scope *S = getScopeForContext(ClassDecl)) 4357 PushOnScopeChains(DefaultCon, S, false); 4358 ClassDecl->addDecl(DefaultCon); 4359 4360 return DefaultCon; 4361} 4362 4363void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4364 CXXConstructorDecl *Constructor) { 4365 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4366 !Constructor->isUsed(false)) && 4367 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4368 4369 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4370 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4371 4372 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4373 DiagnosticErrorTrap Trap(Diags); 4374 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4375 Trap.hasErrorOccurred()) { 4376 Diag(CurrentLocation, diag::note_member_synthesized_at) 4377 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4378 Constructor->setInvalidDecl(); 4379 return; 4380 } 4381 4382 SourceLocation Loc = Constructor->getLocation(); 4383 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4384 4385 Constructor->setUsed(); 4386 MarkVTableUsed(CurrentLocation, ClassDecl); 4387} 4388 4389CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4390 // C++ [class.dtor]p2: 4391 // If a class has no user-declared destructor, a destructor is 4392 // declared implicitly. An implicitly-declared destructor is an 4393 // inline public member of its class. 4394 4395 // C++ [except.spec]p14: 4396 // An implicitly declared special member function (Clause 12) shall have 4397 // an exception-specification. 4398 ImplicitExceptionSpecification ExceptSpec(Context); 4399 4400 // Direct base-class destructors. 4401 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4402 BEnd = ClassDecl->bases_end(); 4403 B != BEnd; ++B) { 4404 if (B->isVirtual()) // Handled below. 4405 continue; 4406 4407 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4408 ExceptSpec.CalledDecl( 4409 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4410 } 4411 4412 // Virtual base-class destructors. 4413 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4414 BEnd = ClassDecl->vbases_end(); 4415 B != BEnd; ++B) { 4416 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4417 ExceptSpec.CalledDecl( 4418 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4419 } 4420 4421 // Field destructors. 4422 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4423 FEnd = ClassDecl->field_end(); 4424 F != FEnd; ++F) { 4425 if (const RecordType *RecordTy 4426 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4427 ExceptSpec.CalledDecl( 4428 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4429 } 4430 4431 // Create the actual destructor declaration. 4432 QualType Ty = Context.getFunctionType(Context.VoidTy, 4433 0, 0, false, 0, 4434 ExceptSpec.hasExceptionSpecification(), 4435 ExceptSpec.hasAnyExceptionSpecification(), 4436 ExceptSpec.size(), 4437 ExceptSpec.data(), 4438 FunctionType::ExtInfo()); 4439 4440 CanQualType ClassType 4441 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4442 DeclarationName Name 4443 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4444 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4445 CXXDestructorDecl *Destructor 4446 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4447 /*isInline=*/true, 4448 /*isImplicitlyDeclared=*/true); 4449 Destructor->setAccess(AS_public); 4450 Destructor->setImplicit(); 4451 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4452 4453 // Note that we have declared this destructor. 4454 ++ASTContext::NumImplicitDestructorsDeclared; 4455 4456 // Introduce this destructor into its scope. 4457 if (Scope *S = getScopeForContext(ClassDecl)) 4458 PushOnScopeChains(Destructor, S, false); 4459 ClassDecl->addDecl(Destructor); 4460 4461 // This could be uniqued if it ever proves significant. 4462 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4463 4464 AddOverriddenMethods(ClassDecl, Destructor); 4465 4466 return Destructor; 4467} 4468 4469void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4470 CXXDestructorDecl *Destructor) { 4471 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4472 "DefineImplicitDestructor - call it for implicit default dtor"); 4473 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4474 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4475 4476 if (Destructor->isInvalidDecl()) 4477 return; 4478 4479 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4480 4481 DiagnosticErrorTrap Trap(Diags); 4482 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4483 Destructor->getParent()); 4484 4485 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4486 Diag(CurrentLocation, diag::note_member_synthesized_at) 4487 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4488 4489 Destructor->setInvalidDecl(); 4490 return; 4491 } 4492 4493 SourceLocation Loc = Destructor->getLocation(); 4494 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4495 4496 Destructor->setUsed(); 4497 MarkVTableUsed(CurrentLocation, ClassDecl); 4498} 4499 4500/// \brief Builds a statement that copies the given entity from \p From to 4501/// \c To. 4502/// 4503/// This routine is used to copy the members of a class with an 4504/// implicitly-declared copy assignment operator. When the entities being 4505/// copied are arrays, this routine builds for loops to copy them. 4506/// 4507/// \param S The Sema object used for type-checking. 4508/// 4509/// \param Loc The location where the implicit copy is being generated. 4510/// 4511/// \param T The type of the expressions being copied. Both expressions must 4512/// have this type. 4513/// 4514/// \param To The expression we are copying to. 4515/// 4516/// \param From The expression we are copying from. 4517/// 4518/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4519/// Otherwise, it's a non-static member subobject. 4520/// 4521/// \param Depth Internal parameter recording the depth of the recursion. 4522/// 4523/// \returns A statement or a loop that copies the expressions. 4524static StmtResult 4525BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4526 Expr *To, Expr *From, 4527 bool CopyingBaseSubobject, unsigned Depth = 0) { 4528 // C++0x [class.copy]p30: 4529 // Each subobject is assigned in the manner appropriate to its type: 4530 // 4531 // - if the subobject is of class type, the copy assignment operator 4532 // for the class is used (as if by explicit qualification; that is, 4533 // ignoring any possible virtual overriding functions in more derived 4534 // classes); 4535 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4536 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4537 4538 // Look for operator=. 4539 DeclarationName Name 4540 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4541 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4542 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4543 4544 // Filter out any result that isn't a copy-assignment operator. 4545 LookupResult::Filter F = OpLookup.makeFilter(); 4546 while (F.hasNext()) { 4547 NamedDecl *D = F.next(); 4548 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4549 if (Method->isCopyAssignmentOperator()) 4550 continue; 4551 4552 F.erase(); 4553 } 4554 F.done(); 4555 4556 // Suppress the protected check (C++ [class.protected]) for each of the 4557 // assignment operators we found. This strange dance is required when 4558 // we're assigning via a base classes's copy-assignment operator. To 4559 // ensure that we're getting the right base class subobject (without 4560 // ambiguities), we need to cast "this" to that subobject type; to 4561 // ensure that we don't go through the virtual call mechanism, we need 4562 // to qualify the operator= name with the base class (see below). However, 4563 // this means that if the base class has a protected copy assignment 4564 // operator, the protected member access check will fail. So, we 4565 // rewrite "protected" access to "public" access in this case, since we 4566 // know by construction that we're calling from a derived class. 4567 if (CopyingBaseSubobject) { 4568 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4569 L != LEnd; ++L) { 4570 if (L.getAccess() == AS_protected) 4571 L.setAccess(AS_public); 4572 } 4573 } 4574 4575 // Create the nested-name-specifier that will be used to qualify the 4576 // reference to operator=; this is required to suppress the virtual 4577 // call mechanism. 4578 CXXScopeSpec SS; 4579 SS.setRange(Loc); 4580 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4581 T.getTypePtr())); 4582 4583 // Create the reference to operator=. 4584 ExprResult OpEqualRef 4585 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4586 /*FirstQualifierInScope=*/0, OpLookup, 4587 /*TemplateArgs=*/0, 4588 /*SuppressQualifierCheck=*/true); 4589 if (OpEqualRef.isInvalid()) 4590 return StmtError(); 4591 4592 // Build the call to the assignment operator. 4593 4594 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4595 OpEqualRef.takeAs<Expr>(), 4596 Loc, &From, 1, Loc); 4597 if (Call.isInvalid()) 4598 return StmtError(); 4599 4600 return S.Owned(Call.takeAs<Stmt>()); 4601 } 4602 4603 // - if the subobject is of scalar type, the built-in assignment 4604 // operator is used. 4605 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4606 if (!ArrayTy) { 4607 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4608 if (Assignment.isInvalid()) 4609 return StmtError(); 4610 4611 return S.Owned(Assignment.takeAs<Stmt>()); 4612 } 4613 4614 // - if the subobject is an array, each element is assigned, in the 4615 // manner appropriate to the element type; 4616 4617 // Construct a loop over the array bounds, e.g., 4618 // 4619 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4620 // 4621 // that will copy each of the array elements. 4622 QualType SizeType = S.Context.getSizeType(); 4623 4624 // Create the iteration variable. 4625 IdentifierInfo *IterationVarName = 0; 4626 { 4627 llvm::SmallString<8> Str; 4628 llvm::raw_svector_ostream OS(Str); 4629 OS << "__i" << Depth; 4630 IterationVarName = &S.Context.Idents.get(OS.str()); 4631 } 4632 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4633 IterationVarName, SizeType, 4634 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4635 SC_None, SC_None); 4636 4637 // Initialize the iteration variable to zero. 4638 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4639 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4640 4641 // Create a reference to the iteration variable; we'll use this several 4642 // times throughout. 4643 Expr *IterationVarRef 4644 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 4645 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4646 4647 // Create the DeclStmt that holds the iteration variable. 4648 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4649 4650 // Create the comparison against the array bound. 4651 llvm::APInt Upper = ArrayTy->getSize(); 4652 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4653 Expr *Comparison 4654 = new (S.Context) BinaryOperator(IterationVarRef, 4655 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 4656 BO_NE, S.Context.BoolTy, 4657 VK_RValue, OK_Ordinary, Loc); 4658 4659 // Create the pre-increment of the iteration variable. 4660 Expr *Increment 4661 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 4662 VK_LValue, OK_Ordinary, Loc); 4663 4664 // Subscript the "from" and "to" expressions with the iteration variable. 4665 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4666 IterationVarRef, Loc)); 4667 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4668 IterationVarRef, Loc)); 4669 4670 // Build the copy for an individual element of the array. 4671 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 4672 To, From, CopyingBaseSubobject, 4673 Depth + 1); 4674 if (Copy.isInvalid()) 4675 return StmtError(); 4676 4677 // Construct the loop that copies all elements of this array. 4678 return S.ActOnForStmt(Loc, Loc, InitStmt, 4679 S.MakeFullExpr(Comparison), 4680 0, S.MakeFullExpr(Increment), 4681 Loc, Copy.take()); 4682} 4683 4684/// \brief Determine whether the given class has a copy assignment operator 4685/// that accepts a const-qualified argument. 4686static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4687 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4688 4689 if (!Class->hasDeclaredCopyAssignment()) 4690 S.DeclareImplicitCopyAssignment(Class); 4691 4692 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4693 DeclarationName OpName 4694 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4695 4696 DeclContext::lookup_const_iterator Op, OpEnd; 4697 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4698 // C++ [class.copy]p9: 4699 // A user-declared copy assignment operator is a non-static non-template 4700 // member function of class X with exactly one parameter of type X, X&, 4701 // const X&, volatile X& or const volatile X&. 4702 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4703 if (!Method) 4704 continue; 4705 4706 if (Method->isStatic()) 4707 continue; 4708 if (Method->getPrimaryTemplate()) 4709 continue; 4710 const FunctionProtoType *FnType = 4711 Method->getType()->getAs<FunctionProtoType>(); 4712 assert(FnType && "Overloaded operator has no prototype."); 4713 // Don't assert on this; an invalid decl might have been left in the AST. 4714 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4715 continue; 4716 bool AcceptsConst = true; 4717 QualType ArgType = FnType->getArgType(0); 4718 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4719 ArgType = Ref->getPointeeType(); 4720 // Is it a non-const lvalue reference? 4721 if (!ArgType.isConstQualified()) 4722 AcceptsConst = false; 4723 } 4724 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4725 continue; 4726 4727 // We have a single argument of type cv X or cv X&, i.e. we've found the 4728 // copy assignment operator. Return whether it accepts const arguments. 4729 return AcceptsConst; 4730 } 4731 assert(Class->isInvalidDecl() && 4732 "No copy assignment operator declared in valid code."); 4733 return false; 4734} 4735 4736CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4737 // Note: The following rules are largely analoguous to the copy 4738 // constructor rules. Note that virtual bases are not taken into account 4739 // for determining the argument type of the operator. Note also that 4740 // operators taking an object instead of a reference are allowed. 4741 4742 4743 // C++ [class.copy]p10: 4744 // If the class definition does not explicitly declare a copy 4745 // assignment operator, one is declared implicitly. 4746 // The implicitly-defined copy assignment operator for a class X 4747 // will have the form 4748 // 4749 // X& X::operator=(const X&) 4750 // 4751 // if 4752 bool HasConstCopyAssignment = true; 4753 4754 // -- each direct base class B of X has a copy assignment operator 4755 // whose parameter is of type const B&, const volatile B& or B, 4756 // and 4757 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4758 BaseEnd = ClassDecl->bases_end(); 4759 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4760 assert(!Base->getType()->isDependentType() && 4761 "Cannot generate implicit members for class with dependent bases."); 4762 const CXXRecordDecl *BaseClassDecl 4763 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4764 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4765 } 4766 4767 // -- for all the nonstatic data members of X that are of a class 4768 // type M (or array thereof), each such class type has a copy 4769 // assignment operator whose parameter is of type const M&, 4770 // const volatile M& or M. 4771 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4772 FieldEnd = ClassDecl->field_end(); 4773 HasConstCopyAssignment && Field != FieldEnd; 4774 ++Field) { 4775 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4776 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4777 const CXXRecordDecl *FieldClassDecl 4778 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4779 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4780 } 4781 } 4782 4783 // Otherwise, the implicitly declared copy assignment operator will 4784 // have the form 4785 // 4786 // X& X::operator=(X&) 4787 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4788 QualType RetType = Context.getLValueReferenceType(ArgType); 4789 if (HasConstCopyAssignment) 4790 ArgType = ArgType.withConst(); 4791 ArgType = Context.getLValueReferenceType(ArgType); 4792 4793 // C++ [except.spec]p14: 4794 // An implicitly declared special member function (Clause 12) shall have an 4795 // exception-specification. [...] 4796 ImplicitExceptionSpecification ExceptSpec(Context); 4797 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4798 BaseEnd = ClassDecl->bases_end(); 4799 Base != BaseEnd; ++Base) { 4800 CXXRecordDecl *BaseClassDecl 4801 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4802 4803 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4804 DeclareImplicitCopyAssignment(BaseClassDecl); 4805 4806 if (CXXMethodDecl *CopyAssign 4807 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4808 ExceptSpec.CalledDecl(CopyAssign); 4809 } 4810 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4811 FieldEnd = ClassDecl->field_end(); 4812 Field != FieldEnd; 4813 ++Field) { 4814 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4815 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4816 CXXRecordDecl *FieldClassDecl 4817 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4818 4819 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4820 DeclareImplicitCopyAssignment(FieldClassDecl); 4821 4822 if (CXXMethodDecl *CopyAssign 4823 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4824 ExceptSpec.CalledDecl(CopyAssign); 4825 } 4826 } 4827 4828 // An implicitly-declared copy assignment operator is an inline public 4829 // member of its class. 4830 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4831 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4832 CXXMethodDecl *CopyAssignment 4833 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4834 Context.getFunctionType(RetType, &ArgType, 1, 4835 false, 0, 4836 ExceptSpec.hasExceptionSpecification(), 4837 ExceptSpec.hasAnyExceptionSpecification(), 4838 ExceptSpec.size(), 4839 ExceptSpec.data(), 4840 FunctionType::ExtInfo()), 4841 /*TInfo=*/0, /*isStatic=*/false, 4842 /*StorageClassAsWritten=*/SC_None, 4843 /*isInline=*/true); 4844 CopyAssignment->setAccess(AS_public); 4845 CopyAssignment->setImplicit(); 4846 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4847 4848 // Add the parameter to the operator. 4849 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4850 ClassDecl->getLocation(), 4851 /*Id=*/0, 4852 ArgType, /*TInfo=*/0, 4853 SC_None, 4854 SC_None, 0); 4855 CopyAssignment->setParams(&FromParam, 1); 4856 4857 // Note that we have added this copy-assignment operator. 4858 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4859 4860 if (Scope *S = getScopeForContext(ClassDecl)) 4861 PushOnScopeChains(CopyAssignment, S, false); 4862 ClassDecl->addDecl(CopyAssignment); 4863 4864 AddOverriddenMethods(ClassDecl, CopyAssignment); 4865 return CopyAssignment; 4866} 4867 4868void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4869 CXXMethodDecl *CopyAssignOperator) { 4870 assert((CopyAssignOperator->isImplicit() && 4871 CopyAssignOperator->isOverloadedOperator() && 4872 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4873 !CopyAssignOperator->isUsed(false)) && 4874 "DefineImplicitCopyAssignment called for wrong function"); 4875 4876 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4877 4878 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4879 CopyAssignOperator->setInvalidDecl(); 4880 return; 4881 } 4882 4883 CopyAssignOperator->setUsed(); 4884 4885 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4886 DiagnosticErrorTrap Trap(Diags); 4887 4888 // C++0x [class.copy]p30: 4889 // The implicitly-defined or explicitly-defaulted copy assignment operator 4890 // for a non-union class X performs memberwise copy assignment of its 4891 // subobjects. The direct base classes of X are assigned first, in the 4892 // order of their declaration in the base-specifier-list, and then the 4893 // immediate non-static data members of X are assigned, in the order in 4894 // which they were declared in the class definition. 4895 4896 // The statements that form the synthesized function body. 4897 ASTOwningVector<Stmt*> Statements(*this); 4898 4899 // The parameter for the "other" object, which we are copying from. 4900 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4901 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4902 QualType OtherRefType = Other->getType(); 4903 if (const LValueReferenceType *OtherRef 4904 = OtherRefType->getAs<LValueReferenceType>()) { 4905 OtherRefType = OtherRef->getPointeeType(); 4906 OtherQuals = OtherRefType.getQualifiers(); 4907 } 4908 4909 // Our location for everything implicitly-generated. 4910 SourceLocation Loc = CopyAssignOperator->getLocation(); 4911 4912 // Construct a reference to the "other" object. We'll be using this 4913 // throughout the generated ASTs. 4914 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 4915 assert(OtherRef && "Reference to parameter cannot fail!"); 4916 4917 // Construct the "this" pointer. We'll be using this throughout the generated 4918 // ASTs. 4919 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4920 assert(This && "Reference to this cannot fail!"); 4921 4922 // Assign base classes. 4923 bool Invalid = false; 4924 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4925 E = ClassDecl->bases_end(); Base != E; ++Base) { 4926 // Form the assignment: 4927 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4928 QualType BaseType = Base->getType().getUnqualifiedType(); 4929 CXXRecordDecl *BaseClassDecl = 0; 4930 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4931 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4932 else { 4933 Invalid = true; 4934 continue; 4935 } 4936 4937 CXXCastPath BasePath; 4938 BasePath.push_back(Base); 4939 4940 // Construct the "from" expression, which is an implicit cast to the 4941 // appropriately-qualified base type. 4942 Expr *From = OtherRef; 4943 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4944 CK_UncheckedDerivedToBase, 4945 VK_LValue, &BasePath); 4946 4947 // Dereference "this". 4948 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4949 4950 // Implicitly cast "this" to the appropriately-qualified base type. 4951 Expr *ToE = To.takeAs<Expr>(); 4952 ImpCastExprToType(ToE, 4953 Context.getCVRQualifiedType(BaseType, 4954 CopyAssignOperator->getTypeQualifiers()), 4955 CK_UncheckedDerivedToBase, 4956 VK_LValue, &BasePath); 4957 To = Owned(ToE); 4958 4959 // Build the copy. 4960 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4961 To.get(), From, 4962 /*CopyingBaseSubobject=*/true); 4963 if (Copy.isInvalid()) { 4964 Diag(CurrentLocation, diag::note_member_synthesized_at) 4965 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4966 CopyAssignOperator->setInvalidDecl(); 4967 return; 4968 } 4969 4970 // Success! Record the copy. 4971 Statements.push_back(Copy.takeAs<Expr>()); 4972 } 4973 4974 // \brief Reference to the __builtin_memcpy function. 4975 Expr *BuiltinMemCpyRef = 0; 4976 // \brief Reference to the __builtin_objc_memmove_collectable function. 4977 Expr *CollectableMemCpyRef = 0; 4978 4979 // Assign non-static members. 4980 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4981 FieldEnd = ClassDecl->field_end(); 4982 Field != FieldEnd; ++Field) { 4983 // Check for members of reference type; we can't copy those. 4984 if (Field->getType()->isReferenceType()) { 4985 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4986 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4987 Diag(Field->getLocation(), diag::note_declared_at); 4988 Diag(CurrentLocation, diag::note_member_synthesized_at) 4989 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4990 Invalid = true; 4991 continue; 4992 } 4993 4994 // Check for members of const-qualified, non-class type. 4995 QualType BaseType = Context.getBaseElementType(Field->getType()); 4996 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4997 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4998 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4999 Diag(Field->getLocation(), diag::note_declared_at); 5000 Diag(CurrentLocation, diag::note_member_synthesized_at) 5001 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5002 Invalid = true; 5003 continue; 5004 } 5005 5006 QualType FieldType = Field->getType().getNonReferenceType(); 5007 if (FieldType->isIncompleteArrayType()) { 5008 assert(ClassDecl->hasFlexibleArrayMember() && 5009 "Incomplete array type is not valid"); 5010 continue; 5011 } 5012 5013 // Build references to the field in the object we're copying from and to. 5014 CXXScopeSpec SS; // Intentionally empty 5015 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5016 LookupMemberName); 5017 MemberLookup.addDecl(*Field); 5018 MemberLookup.resolveKind(); 5019 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5020 Loc, /*IsArrow=*/false, 5021 SS, 0, MemberLookup, 0); 5022 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5023 Loc, /*IsArrow=*/true, 5024 SS, 0, MemberLookup, 0); 5025 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5026 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5027 5028 // If the field should be copied with __builtin_memcpy rather than via 5029 // explicit assignments, do so. This optimization only applies for arrays 5030 // of scalars and arrays of class type with trivial copy-assignment 5031 // operators. 5032 if (FieldType->isArrayType() && 5033 (!BaseType->isRecordType() || 5034 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5035 ->hasTrivialCopyAssignment())) { 5036 // Compute the size of the memory buffer to be copied. 5037 QualType SizeType = Context.getSizeType(); 5038 llvm::APInt Size(Context.getTypeSize(SizeType), 5039 Context.getTypeSizeInChars(BaseType).getQuantity()); 5040 for (const ConstantArrayType *Array 5041 = Context.getAsConstantArrayType(FieldType); 5042 Array; 5043 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5044 llvm::APInt ArraySize = Array->getSize(); 5045 ArraySize.zextOrTrunc(Size.getBitWidth()); 5046 Size *= ArraySize; 5047 } 5048 5049 // Take the address of the field references for "from" and "to". 5050 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5051 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5052 5053 bool NeedsCollectableMemCpy = 5054 (BaseType->isRecordType() && 5055 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5056 5057 if (NeedsCollectableMemCpy) { 5058 if (!CollectableMemCpyRef) { 5059 // Create a reference to the __builtin_objc_memmove_collectable function. 5060 LookupResult R(*this, 5061 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5062 Loc, LookupOrdinaryName); 5063 LookupName(R, TUScope, true); 5064 5065 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5066 if (!CollectableMemCpy) { 5067 // Something went horribly wrong earlier, and we will have 5068 // complained about it. 5069 Invalid = true; 5070 continue; 5071 } 5072 5073 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5074 CollectableMemCpy->getType(), 5075 VK_LValue, Loc, 0).take(); 5076 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5077 } 5078 } 5079 // Create a reference to the __builtin_memcpy builtin function. 5080 else if (!BuiltinMemCpyRef) { 5081 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5082 LookupOrdinaryName); 5083 LookupName(R, TUScope, true); 5084 5085 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5086 if (!BuiltinMemCpy) { 5087 // Something went horribly wrong earlier, and we will have complained 5088 // about it. 5089 Invalid = true; 5090 continue; 5091 } 5092 5093 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5094 BuiltinMemCpy->getType(), 5095 VK_LValue, Loc, 0).take(); 5096 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5097 } 5098 5099 ASTOwningVector<Expr*> CallArgs(*this); 5100 CallArgs.push_back(To.takeAs<Expr>()); 5101 CallArgs.push_back(From.takeAs<Expr>()); 5102 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5103 ExprResult Call = ExprError(); 5104 if (NeedsCollectableMemCpy) 5105 Call = ActOnCallExpr(/*Scope=*/0, 5106 CollectableMemCpyRef, 5107 Loc, move_arg(CallArgs), 5108 Loc); 5109 else 5110 Call = ActOnCallExpr(/*Scope=*/0, 5111 BuiltinMemCpyRef, 5112 Loc, move_arg(CallArgs), 5113 Loc); 5114 5115 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5116 Statements.push_back(Call.takeAs<Expr>()); 5117 continue; 5118 } 5119 5120 // Build the copy of this field. 5121 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5122 To.get(), From.get(), 5123 /*CopyingBaseSubobject=*/false); 5124 if (Copy.isInvalid()) { 5125 Diag(CurrentLocation, diag::note_member_synthesized_at) 5126 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5127 CopyAssignOperator->setInvalidDecl(); 5128 return; 5129 } 5130 5131 // Success! Record the copy. 5132 Statements.push_back(Copy.takeAs<Stmt>()); 5133 } 5134 5135 if (!Invalid) { 5136 // Add a "return *this;" 5137 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5138 5139 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5140 if (Return.isInvalid()) 5141 Invalid = true; 5142 else { 5143 Statements.push_back(Return.takeAs<Stmt>()); 5144 5145 if (Trap.hasErrorOccurred()) { 5146 Diag(CurrentLocation, diag::note_member_synthesized_at) 5147 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5148 Invalid = true; 5149 } 5150 } 5151 } 5152 5153 if (Invalid) { 5154 CopyAssignOperator->setInvalidDecl(); 5155 return; 5156 } 5157 5158 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5159 /*isStmtExpr=*/false); 5160 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5161 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5162} 5163 5164CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5165 CXXRecordDecl *ClassDecl) { 5166 // C++ [class.copy]p4: 5167 // If the class definition does not explicitly declare a copy 5168 // constructor, one is declared implicitly. 5169 5170 // C++ [class.copy]p5: 5171 // The implicitly-declared copy constructor for a class X will 5172 // have the form 5173 // 5174 // X::X(const X&) 5175 // 5176 // if 5177 bool HasConstCopyConstructor = true; 5178 5179 // -- each direct or virtual base class B of X has a copy 5180 // constructor whose first parameter is of type const B& or 5181 // const volatile B&, and 5182 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5183 BaseEnd = ClassDecl->bases_end(); 5184 HasConstCopyConstructor && Base != BaseEnd; 5185 ++Base) { 5186 // Virtual bases are handled below. 5187 if (Base->isVirtual()) 5188 continue; 5189 5190 CXXRecordDecl *BaseClassDecl 5191 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5192 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5193 DeclareImplicitCopyConstructor(BaseClassDecl); 5194 5195 HasConstCopyConstructor 5196 = BaseClassDecl->hasConstCopyConstructor(Context); 5197 } 5198 5199 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5200 BaseEnd = ClassDecl->vbases_end(); 5201 HasConstCopyConstructor && Base != BaseEnd; 5202 ++Base) { 5203 CXXRecordDecl *BaseClassDecl 5204 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5205 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5206 DeclareImplicitCopyConstructor(BaseClassDecl); 5207 5208 HasConstCopyConstructor 5209 = BaseClassDecl->hasConstCopyConstructor(Context); 5210 } 5211 5212 // -- for all the nonstatic data members of X that are of a 5213 // class type M (or array thereof), each such class type 5214 // has a copy constructor whose first parameter is of type 5215 // const M& or const volatile M&. 5216 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5217 FieldEnd = ClassDecl->field_end(); 5218 HasConstCopyConstructor && Field != FieldEnd; 5219 ++Field) { 5220 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5221 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5222 CXXRecordDecl *FieldClassDecl 5223 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5224 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5225 DeclareImplicitCopyConstructor(FieldClassDecl); 5226 5227 HasConstCopyConstructor 5228 = FieldClassDecl->hasConstCopyConstructor(Context); 5229 } 5230 } 5231 5232 // Otherwise, the implicitly declared copy constructor will have 5233 // the form 5234 // 5235 // X::X(X&) 5236 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5237 QualType ArgType = ClassType; 5238 if (HasConstCopyConstructor) 5239 ArgType = ArgType.withConst(); 5240 ArgType = Context.getLValueReferenceType(ArgType); 5241 5242 // C++ [except.spec]p14: 5243 // An implicitly declared special member function (Clause 12) shall have an 5244 // exception-specification. [...] 5245 ImplicitExceptionSpecification ExceptSpec(Context); 5246 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5247 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5248 BaseEnd = ClassDecl->bases_end(); 5249 Base != BaseEnd; 5250 ++Base) { 5251 // Virtual bases are handled below. 5252 if (Base->isVirtual()) 5253 continue; 5254 5255 CXXRecordDecl *BaseClassDecl 5256 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5257 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5258 DeclareImplicitCopyConstructor(BaseClassDecl); 5259 5260 if (CXXConstructorDecl *CopyConstructor 5261 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5262 ExceptSpec.CalledDecl(CopyConstructor); 5263 } 5264 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5265 BaseEnd = ClassDecl->vbases_end(); 5266 Base != BaseEnd; 5267 ++Base) { 5268 CXXRecordDecl *BaseClassDecl 5269 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5270 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5271 DeclareImplicitCopyConstructor(BaseClassDecl); 5272 5273 if (CXXConstructorDecl *CopyConstructor 5274 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5275 ExceptSpec.CalledDecl(CopyConstructor); 5276 } 5277 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5278 FieldEnd = ClassDecl->field_end(); 5279 Field != FieldEnd; 5280 ++Field) { 5281 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5282 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5283 CXXRecordDecl *FieldClassDecl 5284 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5285 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5286 DeclareImplicitCopyConstructor(FieldClassDecl); 5287 5288 if (CXXConstructorDecl *CopyConstructor 5289 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5290 ExceptSpec.CalledDecl(CopyConstructor); 5291 } 5292 } 5293 5294 // An implicitly-declared copy constructor is an inline public 5295 // member of its class. 5296 DeclarationName Name 5297 = Context.DeclarationNames.getCXXConstructorName( 5298 Context.getCanonicalType(ClassType)); 5299 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5300 CXXConstructorDecl *CopyConstructor 5301 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5302 Context.getFunctionType(Context.VoidTy, 5303 &ArgType, 1, 5304 false, 0, 5305 ExceptSpec.hasExceptionSpecification(), 5306 ExceptSpec.hasAnyExceptionSpecification(), 5307 ExceptSpec.size(), 5308 ExceptSpec.data(), 5309 FunctionType::ExtInfo()), 5310 /*TInfo=*/0, 5311 /*isExplicit=*/false, 5312 /*isInline=*/true, 5313 /*isImplicitlyDeclared=*/true); 5314 CopyConstructor->setAccess(AS_public); 5315 CopyConstructor->setImplicit(); 5316 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5317 5318 // Note that we have declared this constructor. 5319 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5320 5321 // Add the parameter to the constructor. 5322 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5323 ClassDecl->getLocation(), 5324 /*IdentifierInfo=*/0, 5325 ArgType, /*TInfo=*/0, 5326 SC_None, 5327 SC_None, 0); 5328 CopyConstructor->setParams(&FromParam, 1); 5329 if (Scope *S = getScopeForContext(ClassDecl)) 5330 PushOnScopeChains(CopyConstructor, S, false); 5331 ClassDecl->addDecl(CopyConstructor); 5332 5333 return CopyConstructor; 5334} 5335 5336void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5337 CXXConstructorDecl *CopyConstructor, 5338 unsigned TypeQuals) { 5339 assert((CopyConstructor->isImplicit() && 5340 CopyConstructor->isCopyConstructor(TypeQuals) && 5341 !CopyConstructor->isUsed(false)) && 5342 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5343 5344 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5345 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5346 5347 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5348 DiagnosticErrorTrap Trap(Diags); 5349 5350 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5351 Trap.hasErrorOccurred()) { 5352 Diag(CurrentLocation, diag::note_member_synthesized_at) 5353 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5354 CopyConstructor->setInvalidDecl(); 5355 } else { 5356 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5357 CopyConstructor->getLocation(), 5358 MultiStmtArg(*this, 0, 0), 5359 /*isStmtExpr=*/false) 5360 .takeAs<Stmt>()); 5361 } 5362 5363 CopyConstructor->setUsed(); 5364} 5365 5366ExprResult 5367Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5368 CXXConstructorDecl *Constructor, 5369 MultiExprArg ExprArgs, 5370 bool RequiresZeroInit, 5371 unsigned ConstructKind, 5372 SourceRange ParenRange) { 5373 bool Elidable = false; 5374 5375 // C++0x [class.copy]p34: 5376 // When certain criteria are met, an implementation is allowed to 5377 // omit the copy/move construction of a class object, even if the 5378 // copy/move constructor and/or destructor for the object have 5379 // side effects. [...] 5380 // - when a temporary class object that has not been bound to a 5381 // reference (12.2) would be copied/moved to a class object 5382 // with the same cv-unqualified type, the copy/move operation 5383 // can be omitted by constructing the temporary object 5384 // directly into the target of the omitted copy/move 5385 if (ConstructKind == CXXConstructExpr::CK_Complete && 5386 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5387 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5388 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5389 } 5390 5391 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5392 Elidable, move(ExprArgs), RequiresZeroInit, 5393 ConstructKind, ParenRange); 5394} 5395 5396/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5397/// including handling of its default argument expressions. 5398ExprResult 5399Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5400 CXXConstructorDecl *Constructor, bool Elidable, 5401 MultiExprArg ExprArgs, 5402 bool RequiresZeroInit, 5403 unsigned ConstructKind, 5404 SourceRange ParenRange) { 5405 unsigned NumExprs = ExprArgs.size(); 5406 Expr **Exprs = (Expr **)ExprArgs.release(); 5407 5408 MarkDeclarationReferenced(ConstructLoc, Constructor); 5409 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5410 Constructor, Elidable, Exprs, NumExprs, 5411 RequiresZeroInit, 5412 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5413 ParenRange)); 5414} 5415 5416bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5417 CXXConstructorDecl *Constructor, 5418 MultiExprArg Exprs) { 5419 // FIXME: Provide the correct paren SourceRange when available. 5420 ExprResult TempResult = 5421 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5422 move(Exprs), false, CXXConstructExpr::CK_Complete, 5423 SourceRange()); 5424 if (TempResult.isInvalid()) 5425 return true; 5426 5427 Expr *Temp = TempResult.takeAs<Expr>(); 5428 CheckImplicitConversions(Temp, VD->getLocation()); 5429 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5430 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5431 VD->setInit(Temp); 5432 5433 return false; 5434} 5435 5436void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5437 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5438 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5439 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5440 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5441 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5442 CheckDestructorAccess(VD->getLocation(), Destructor, 5443 PDiag(diag::err_access_dtor_var) 5444 << VD->getDeclName() 5445 << VD->getType()); 5446 5447 // TODO: this should be re-enabled for static locals by !CXAAtExit 5448 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5449 Diag(VD->getLocation(), diag::warn_global_destructor); 5450 } 5451} 5452 5453/// AddCXXDirectInitializerToDecl - This action is called immediately after 5454/// ActOnDeclarator, when a C++ direct initializer is present. 5455/// e.g: "int x(1);" 5456void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5457 SourceLocation LParenLoc, 5458 MultiExprArg Exprs, 5459 SourceLocation RParenLoc) { 5460 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5461 5462 // If there is no declaration, there was an error parsing it. Just ignore 5463 // the initializer. 5464 if (RealDecl == 0) 5465 return; 5466 5467 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5468 if (!VDecl) { 5469 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5470 RealDecl->setInvalidDecl(); 5471 return; 5472 } 5473 5474 // We will represent direct-initialization similarly to copy-initialization: 5475 // int x(1); -as-> int x = 1; 5476 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5477 // 5478 // Clients that want to distinguish between the two forms, can check for 5479 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5480 // A major benefit is that clients that don't particularly care about which 5481 // exactly form was it (like the CodeGen) can handle both cases without 5482 // special case code. 5483 5484 // C++ 8.5p11: 5485 // The form of initialization (using parentheses or '=') is generally 5486 // insignificant, but does matter when the entity being initialized has a 5487 // class type. 5488 5489 if (!VDecl->getType()->isDependentType() && 5490 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5491 diag::err_typecheck_decl_incomplete_type)) { 5492 VDecl->setInvalidDecl(); 5493 return; 5494 } 5495 5496 // The variable can not have an abstract class type. 5497 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5498 diag::err_abstract_type_in_decl, 5499 AbstractVariableType)) 5500 VDecl->setInvalidDecl(); 5501 5502 const VarDecl *Def; 5503 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5504 Diag(VDecl->getLocation(), diag::err_redefinition) 5505 << VDecl->getDeclName(); 5506 Diag(Def->getLocation(), diag::note_previous_definition); 5507 VDecl->setInvalidDecl(); 5508 return; 5509 } 5510 5511 // C++ [class.static.data]p4 5512 // If a static data member is of const integral or const 5513 // enumeration type, its declaration in the class definition can 5514 // specify a constant-initializer which shall be an integral 5515 // constant expression (5.19). In that case, the member can appear 5516 // in integral constant expressions. The member shall still be 5517 // defined in a namespace scope if it is used in the program and the 5518 // namespace scope definition shall not contain an initializer. 5519 // 5520 // We already performed a redefinition check above, but for static 5521 // data members we also need to check whether there was an in-class 5522 // declaration with an initializer. 5523 const VarDecl* PrevInit = 0; 5524 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5525 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5526 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5527 return; 5528 } 5529 5530 // If either the declaration has a dependent type or if any of the 5531 // expressions is type-dependent, we represent the initialization 5532 // via a ParenListExpr for later use during template instantiation. 5533 if (VDecl->getType()->isDependentType() || 5534 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5535 // Let clients know that initialization was done with a direct initializer. 5536 VDecl->setCXXDirectInitializer(true); 5537 5538 // Store the initialization expressions as a ParenListExpr. 5539 unsigned NumExprs = Exprs.size(); 5540 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5541 (Expr **)Exprs.release(), 5542 NumExprs, RParenLoc)); 5543 return; 5544 } 5545 5546 // Capture the variable that is being initialized and the style of 5547 // initialization. 5548 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5549 5550 // FIXME: Poor source location information. 5551 InitializationKind Kind 5552 = InitializationKind::CreateDirect(VDecl->getLocation(), 5553 LParenLoc, RParenLoc); 5554 5555 InitializationSequence InitSeq(*this, Entity, Kind, 5556 Exprs.get(), Exprs.size()); 5557 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5558 if (Result.isInvalid()) { 5559 VDecl->setInvalidDecl(); 5560 return; 5561 } 5562 5563 CheckImplicitConversions(Result.get(), LParenLoc); 5564 5565 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5566 VDecl->setInit(Result.takeAs<Expr>()); 5567 VDecl->setCXXDirectInitializer(true); 5568 5569 if (!VDecl->isInvalidDecl() && 5570 !VDecl->getDeclContext()->isDependentContext() && 5571 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5572 !VDecl->getInit()->isConstantInitializer(Context, 5573 VDecl->getType()->isReferenceType())) 5574 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5575 << VDecl->getInit()->getSourceRange(); 5576 5577 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5578 FinalizeVarWithDestructor(VDecl, Record); 5579} 5580 5581/// \brief Given a constructor and the set of arguments provided for the 5582/// constructor, convert the arguments and add any required default arguments 5583/// to form a proper call to this constructor. 5584/// 5585/// \returns true if an error occurred, false otherwise. 5586bool 5587Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5588 MultiExprArg ArgsPtr, 5589 SourceLocation Loc, 5590 ASTOwningVector<Expr*> &ConvertedArgs) { 5591 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5592 unsigned NumArgs = ArgsPtr.size(); 5593 Expr **Args = (Expr **)ArgsPtr.get(); 5594 5595 const FunctionProtoType *Proto 5596 = Constructor->getType()->getAs<FunctionProtoType>(); 5597 assert(Proto && "Constructor without a prototype?"); 5598 unsigned NumArgsInProto = Proto->getNumArgs(); 5599 5600 // If too few arguments are available, we'll fill in the rest with defaults. 5601 if (NumArgs < NumArgsInProto) 5602 ConvertedArgs.reserve(NumArgsInProto); 5603 else 5604 ConvertedArgs.reserve(NumArgs); 5605 5606 VariadicCallType CallType = 5607 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5608 llvm::SmallVector<Expr *, 8> AllArgs; 5609 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5610 Proto, 0, Args, NumArgs, AllArgs, 5611 CallType); 5612 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5613 ConvertedArgs.push_back(AllArgs[i]); 5614 return Invalid; 5615} 5616 5617static inline bool 5618CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5619 const FunctionDecl *FnDecl) { 5620 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5621 if (isa<NamespaceDecl>(DC)) { 5622 return SemaRef.Diag(FnDecl->getLocation(), 5623 diag::err_operator_new_delete_declared_in_namespace) 5624 << FnDecl->getDeclName(); 5625 } 5626 5627 if (isa<TranslationUnitDecl>(DC) && 5628 FnDecl->getStorageClass() == SC_Static) { 5629 return SemaRef.Diag(FnDecl->getLocation(), 5630 diag::err_operator_new_delete_declared_static) 5631 << FnDecl->getDeclName(); 5632 } 5633 5634 return false; 5635} 5636 5637static inline bool 5638CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5639 CanQualType ExpectedResultType, 5640 CanQualType ExpectedFirstParamType, 5641 unsigned DependentParamTypeDiag, 5642 unsigned InvalidParamTypeDiag) { 5643 QualType ResultType = 5644 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5645 5646 // Check that the result type is not dependent. 5647 if (ResultType->isDependentType()) 5648 return SemaRef.Diag(FnDecl->getLocation(), 5649 diag::err_operator_new_delete_dependent_result_type) 5650 << FnDecl->getDeclName() << ExpectedResultType; 5651 5652 // Check that the result type is what we expect. 5653 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5654 return SemaRef.Diag(FnDecl->getLocation(), 5655 diag::err_operator_new_delete_invalid_result_type) 5656 << FnDecl->getDeclName() << ExpectedResultType; 5657 5658 // A function template must have at least 2 parameters. 5659 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5660 return SemaRef.Diag(FnDecl->getLocation(), 5661 diag::err_operator_new_delete_template_too_few_parameters) 5662 << FnDecl->getDeclName(); 5663 5664 // The function decl must have at least 1 parameter. 5665 if (FnDecl->getNumParams() == 0) 5666 return SemaRef.Diag(FnDecl->getLocation(), 5667 diag::err_operator_new_delete_too_few_parameters) 5668 << FnDecl->getDeclName(); 5669 5670 // Check the the first parameter type is not dependent. 5671 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5672 if (FirstParamType->isDependentType()) 5673 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5674 << FnDecl->getDeclName() << ExpectedFirstParamType; 5675 5676 // Check that the first parameter type is what we expect. 5677 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5678 ExpectedFirstParamType) 5679 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5680 << FnDecl->getDeclName() << ExpectedFirstParamType; 5681 5682 return false; 5683} 5684 5685static bool 5686CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5687 // C++ [basic.stc.dynamic.allocation]p1: 5688 // A program is ill-formed if an allocation function is 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 CanQualType SizeTy = 5695 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5696 5697 // C++ [basic.stc.dynamic.allocation]p1: 5698 // The return type shall be void*. The first parameter shall have type 5699 // std::size_t. 5700 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5701 SizeTy, 5702 diag::err_operator_new_dependent_param_type, 5703 diag::err_operator_new_param_type)) 5704 return true; 5705 5706 // C++ [basic.stc.dynamic.allocation]p1: 5707 // The first parameter shall not have an associated default argument. 5708 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5709 return SemaRef.Diag(FnDecl->getLocation(), 5710 diag::err_operator_new_default_arg) 5711 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5712 5713 return false; 5714} 5715 5716static bool 5717CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5718 // C++ [basic.stc.dynamic.deallocation]p1: 5719 // A program is ill-formed if deallocation functions are declared in a 5720 // namespace scope other than global scope or declared static in global 5721 // scope. 5722 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5723 return true; 5724 5725 // C++ [basic.stc.dynamic.deallocation]p2: 5726 // Each deallocation function shall return void and its first parameter 5727 // shall be void*. 5728 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5729 SemaRef.Context.VoidPtrTy, 5730 diag::err_operator_delete_dependent_param_type, 5731 diag::err_operator_delete_param_type)) 5732 return true; 5733 5734 return false; 5735} 5736 5737/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5738/// of this overloaded operator is well-formed. If so, returns false; 5739/// otherwise, emits appropriate diagnostics and returns true. 5740bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5741 assert(FnDecl && FnDecl->isOverloadedOperator() && 5742 "Expected an overloaded operator declaration"); 5743 5744 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5745 5746 // C++ [over.oper]p5: 5747 // The allocation and deallocation functions, operator new, 5748 // operator new[], operator delete and operator delete[], are 5749 // described completely in 3.7.3. The attributes and restrictions 5750 // found in the rest of this subclause do not apply to them unless 5751 // explicitly stated in 3.7.3. 5752 if (Op == OO_Delete || Op == OO_Array_Delete) 5753 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5754 5755 if (Op == OO_New || Op == OO_Array_New) 5756 return CheckOperatorNewDeclaration(*this, FnDecl); 5757 5758 // C++ [over.oper]p6: 5759 // An operator function shall either be a non-static member 5760 // function or be a non-member function and have at least one 5761 // parameter whose type is a class, a reference to a class, an 5762 // enumeration, or a reference to an enumeration. 5763 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5764 if (MethodDecl->isStatic()) 5765 return Diag(FnDecl->getLocation(), 5766 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5767 } else { 5768 bool ClassOrEnumParam = false; 5769 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5770 ParamEnd = FnDecl->param_end(); 5771 Param != ParamEnd; ++Param) { 5772 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5773 if (ParamType->isDependentType() || ParamType->isRecordType() || 5774 ParamType->isEnumeralType()) { 5775 ClassOrEnumParam = true; 5776 break; 5777 } 5778 } 5779 5780 if (!ClassOrEnumParam) 5781 return Diag(FnDecl->getLocation(), 5782 diag::err_operator_overload_needs_class_or_enum) 5783 << FnDecl->getDeclName(); 5784 } 5785 5786 // C++ [over.oper]p8: 5787 // An operator function cannot have default arguments (8.3.6), 5788 // except where explicitly stated below. 5789 // 5790 // Only the function-call operator allows default arguments 5791 // (C++ [over.call]p1). 5792 if (Op != OO_Call) { 5793 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5794 Param != FnDecl->param_end(); ++Param) { 5795 if ((*Param)->hasDefaultArg()) 5796 return Diag((*Param)->getLocation(), 5797 diag::err_operator_overload_default_arg) 5798 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5799 } 5800 } 5801 5802 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5803 { false, false, false } 5804#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5805 , { Unary, Binary, MemberOnly } 5806#include "clang/Basic/OperatorKinds.def" 5807 }; 5808 5809 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5810 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5811 bool MustBeMemberOperator = OperatorUses[Op][2]; 5812 5813 // C++ [over.oper]p8: 5814 // [...] Operator functions cannot have more or fewer parameters 5815 // than the number required for the corresponding operator, as 5816 // described in the rest of this subclause. 5817 unsigned NumParams = FnDecl->getNumParams() 5818 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5819 if (Op != OO_Call && 5820 ((NumParams == 1 && !CanBeUnaryOperator) || 5821 (NumParams == 2 && !CanBeBinaryOperator) || 5822 (NumParams < 1) || (NumParams > 2))) { 5823 // We have the wrong number of parameters. 5824 unsigned ErrorKind; 5825 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5826 ErrorKind = 2; // 2 -> unary or binary. 5827 } else if (CanBeUnaryOperator) { 5828 ErrorKind = 0; // 0 -> unary 5829 } else { 5830 assert(CanBeBinaryOperator && 5831 "All non-call overloaded operators are unary or binary!"); 5832 ErrorKind = 1; // 1 -> binary 5833 } 5834 5835 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5836 << FnDecl->getDeclName() << NumParams << ErrorKind; 5837 } 5838 5839 // Overloaded operators other than operator() cannot be variadic. 5840 if (Op != OO_Call && 5841 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5842 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5843 << FnDecl->getDeclName(); 5844 } 5845 5846 // Some operators must be non-static member functions. 5847 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5848 return Diag(FnDecl->getLocation(), 5849 diag::err_operator_overload_must_be_member) 5850 << FnDecl->getDeclName(); 5851 } 5852 5853 // C++ [over.inc]p1: 5854 // The user-defined function called operator++ implements the 5855 // prefix and postfix ++ operator. If this function is a member 5856 // function with no parameters, or a non-member function with one 5857 // parameter of class or enumeration type, it defines the prefix 5858 // increment operator ++ for objects of that type. If the function 5859 // is a member function with one parameter (which shall be of type 5860 // int) or a non-member function with two parameters (the second 5861 // of which shall be of type int), it defines the postfix 5862 // increment operator ++ for objects of that type. 5863 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5864 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5865 bool ParamIsInt = false; 5866 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5867 ParamIsInt = BT->getKind() == BuiltinType::Int; 5868 5869 if (!ParamIsInt) 5870 return Diag(LastParam->getLocation(), 5871 diag::err_operator_overload_post_incdec_must_be_int) 5872 << LastParam->getType() << (Op == OO_MinusMinus); 5873 } 5874 5875 return false; 5876} 5877 5878/// CheckLiteralOperatorDeclaration - Check whether the declaration 5879/// of this literal operator function is well-formed. If so, returns 5880/// false; otherwise, emits appropriate diagnostics and returns true. 5881bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5882 DeclContext *DC = FnDecl->getDeclContext(); 5883 Decl::Kind Kind = DC->getDeclKind(); 5884 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5885 Kind != Decl::LinkageSpec) { 5886 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5887 << FnDecl->getDeclName(); 5888 return true; 5889 } 5890 5891 bool Valid = false; 5892 5893 // template <char...> type operator "" name() is the only valid template 5894 // signature, and the only valid signature with no parameters. 5895 if (FnDecl->param_size() == 0) { 5896 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5897 // Must have only one template parameter 5898 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5899 if (Params->size() == 1) { 5900 NonTypeTemplateParmDecl *PmDecl = 5901 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5902 5903 // The template parameter must be a char parameter pack. 5904 // FIXME: This test will always fail because non-type parameter packs 5905 // have not been implemented. 5906 if (PmDecl && PmDecl->isTemplateParameterPack() && 5907 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5908 Valid = true; 5909 } 5910 } 5911 } else { 5912 // Check the first parameter 5913 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5914 5915 QualType T = (*Param)->getType(); 5916 5917 // unsigned long long int, long double, and any character type are allowed 5918 // as the only parameters. 5919 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5920 Context.hasSameType(T, Context.LongDoubleTy) || 5921 Context.hasSameType(T, Context.CharTy) || 5922 Context.hasSameType(T, Context.WCharTy) || 5923 Context.hasSameType(T, Context.Char16Ty) || 5924 Context.hasSameType(T, Context.Char32Ty)) { 5925 if (++Param == FnDecl->param_end()) 5926 Valid = true; 5927 goto FinishedParams; 5928 } 5929 5930 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5931 const PointerType *PT = T->getAs<PointerType>(); 5932 if (!PT) 5933 goto FinishedParams; 5934 T = PT->getPointeeType(); 5935 if (!T.isConstQualified()) 5936 goto FinishedParams; 5937 T = T.getUnqualifiedType(); 5938 5939 // Move on to the second parameter; 5940 ++Param; 5941 5942 // If there is no second parameter, the first must be a const char * 5943 if (Param == FnDecl->param_end()) { 5944 if (Context.hasSameType(T, Context.CharTy)) 5945 Valid = true; 5946 goto FinishedParams; 5947 } 5948 5949 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5950 // are allowed as the first parameter to a two-parameter function 5951 if (!(Context.hasSameType(T, Context.CharTy) || 5952 Context.hasSameType(T, Context.WCharTy) || 5953 Context.hasSameType(T, Context.Char16Ty) || 5954 Context.hasSameType(T, Context.Char32Ty))) 5955 goto FinishedParams; 5956 5957 // The second and final parameter must be an std::size_t 5958 T = (*Param)->getType().getUnqualifiedType(); 5959 if (Context.hasSameType(T, Context.getSizeType()) && 5960 ++Param == FnDecl->param_end()) 5961 Valid = true; 5962 } 5963 5964 // FIXME: This diagnostic is absolutely terrible. 5965FinishedParams: 5966 if (!Valid) { 5967 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5968 << FnDecl->getDeclName(); 5969 return true; 5970 } 5971 5972 return false; 5973} 5974 5975/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5976/// linkage specification, including the language and (if present) 5977/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5978/// the location of the language string literal, which is provided 5979/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5980/// the '{' brace. Otherwise, this linkage specification does not 5981/// have any braces. 5982Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 5983 SourceLocation LangLoc, 5984 llvm::StringRef Lang, 5985 SourceLocation LBraceLoc) { 5986 LinkageSpecDecl::LanguageIDs Language; 5987 if (Lang == "\"C\"") 5988 Language = LinkageSpecDecl::lang_c; 5989 else if (Lang == "\"C++\"") 5990 Language = LinkageSpecDecl::lang_cxx; 5991 else { 5992 Diag(LangLoc, diag::err_bad_language); 5993 return 0; 5994 } 5995 5996 // FIXME: Add all the various semantics of linkage specifications 5997 5998 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5999 LangLoc, Language, 6000 LBraceLoc.isValid()); 6001 CurContext->addDecl(D); 6002 PushDeclContext(S, D); 6003 return D; 6004} 6005 6006/// ActOnFinishLinkageSpecification - Complete the definition of 6007/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6008/// valid, it's the position of the closing '}' brace in a linkage 6009/// specification that uses braces. 6010Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6011 Decl *LinkageSpec, 6012 SourceLocation RBraceLoc) { 6013 if (LinkageSpec) 6014 PopDeclContext(); 6015 return LinkageSpec; 6016} 6017 6018/// \brief Perform semantic analysis for the variable declaration that 6019/// occurs within a C++ catch clause, returning the newly-created 6020/// variable. 6021VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6022 TypeSourceInfo *TInfo, 6023 IdentifierInfo *Name, 6024 SourceLocation Loc) { 6025 bool Invalid = false; 6026 QualType ExDeclType = TInfo->getType(); 6027 6028 // Arrays and functions decay. 6029 if (ExDeclType->isArrayType()) 6030 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6031 else if (ExDeclType->isFunctionType()) 6032 ExDeclType = Context.getPointerType(ExDeclType); 6033 6034 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6035 // The exception-declaration shall not denote a pointer or reference to an 6036 // incomplete type, other than [cv] void*. 6037 // N2844 forbids rvalue references. 6038 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6039 Diag(Loc, diag::err_catch_rvalue_ref); 6040 Invalid = true; 6041 } 6042 6043 // GCC allows catching pointers and references to incomplete types 6044 // as an extension; so do we, but we warn by default. 6045 6046 QualType BaseType = ExDeclType; 6047 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6048 unsigned DK = diag::err_catch_incomplete; 6049 bool IncompleteCatchIsInvalid = true; 6050 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6051 BaseType = Ptr->getPointeeType(); 6052 Mode = 1; 6053 DK = diag::ext_catch_incomplete_ptr; 6054 IncompleteCatchIsInvalid = false; 6055 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6056 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6057 BaseType = Ref->getPointeeType(); 6058 Mode = 2; 6059 DK = diag::ext_catch_incomplete_ref; 6060 IncompleteCatchIsInvalid = false; 6061 } 6062 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6063 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6064 IncompleteCatchIsInvalid) 6065 Invalid = true; 6066 6067 if (!Invalid && !ExDeclType->isDependentType() && 6068 RequireNonAbstractType(Loc, ExDeclType, 6069 diag::err_abstract_type_in_decl, 6070 AbstractVariableType)) 6071 Invalid = true; 6072 6073 // Only the non-fragile NeXT runtime currently supports C++ catches 6074 // of ObjC types, and no runtime supports catching ObjC types by value. 6075 if (!Invalid && getLangOptions().ObjC1) { 6076 QualType T = ExDeclType; 6077 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6078 T = RT->getPointeeType(); 6079 6080 if (T->isObjCObjectType()) { 6081 Diag(Loc, diag::err_objc_object_catch); 6082 Invalid = true; 6083 } else if (T->isObjCObjectPointerType()) { 6084 if (!getLangOptions().NeXTRuntime) { 6085 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6086 Invalid = true; 6087 } else if (!getLangOptions().ObjCNonFragileABI) { 6088 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6089 Invalid = true; 6090 } 6091 } 6092 } 6093 6094 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6095 Name, ExDeclType, TInfo, SC_None, 6096 SC_None); 6097 ExDecl->setExceptionVariable(true); 6098 6099 if (!Invalid) { 6100 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6101 // C++ [except.handle]p16: 6102 // The object declared in an exception-declaration or, if the 6103 // exception-declaration does not specify a name, a temporary (12.2) is 6104 // copy-initialized (8.5) from the exception object. [...] 6105 // The object is destroyed when the handler exits, after the destruction 6106 // of any automatic objects initialized within the handler. 6107 // 6108 // We just pretend to initialize the object with itself, then make sure 6109 // it can be destroyed later. 6110 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6111 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6112 Loc, ExDeclType, VK_LValue, 0); 6113 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6114 SourceLocation()); 6115 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6116 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6117 MultiExprArg(*this, &ExDeclRef, 1)); 6118 if (Result.isInvalid()) 6119 Invalid = true; 6120 else 6121 FinalizeVarWithDestructor(ExDecl, RecordTy); 6122 } 6123 } 6124 6125 if (Invalid) 6126 ExDecl->setInvalidDecl(); 6127 6128 return ExDecl; 6129} 6130 6131/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6132/// handler. 6133Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6134 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6135 QualType ExDeclType = TInfo->getType(); 6136 6137 bool Invalid = D.isInvalidType(); 6138 IdentifierInfo *II = D.getIdentifier(); 6139 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6140 LookupOrdinaryName, 6141 ForRedeclaration)) { 6142 // The scope should be freshly made just for us. There is just no way 6143 // it contains any previous declaration. 6144 assert(!S->isDeclScope(PrevDecl)); 6145 if (PrevDecl->isTemplateParameter()) { 6146 // Maybe we will complain about the shadowed template parameter. 6147 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6148 } 6149 } 6150 6151 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6152 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6153 << D.getCXXScopeSpec().getRange(); 6154 Invalid = true; 6155 } 6156 6157 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6158 D.getIdentifier(), 6159 D.getIdentifierLoc()); 6160 6161 if (Invalid) 6162 ExDecl->setInvalidDecl(); 6163 6164 // Add the exception declaration into this scope. 6165 if (II) 6166 PushOnScopeChains(ExDecl, S); 6167 else 6168 CurContext->addDecl(ExDecl); 6169 6170 ProcessDeclAttributes(S, ExDecl, D); 6171 return ExDecl; 6172} 6173 6174Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6175 Expr *AssertExpr, 6176 Expr *AssertMessageExpr_) { 6177 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6178 6179 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6180 llvm::APSInt Value(32); 6181 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6182 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6183 AssertExpr->getSourceRange(); 6184 return 0; 6185 } 6186 6187 if (Value == 0) { 6188 Diag(AssertLoc, diag::err_static_assert_failed) 6189 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6190 } 6191 } 6192 6193 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6194 AssertExpr, AssertMessage); 6195 6196 CurContext->addDecl(Decl); 6197 return Decl; 6198} 6199 6200/// \brief Perform semantic analysis of the given friend type declaration. 6201/// 6202/// \returns A friend declaration that. 6203FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6204 TypeSourceInfo *TSInfo) { 6205 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6206 6207 QualType T = TSInfo->getType(); 6208 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6209 6210 if (!getLangOptions().CPlusPlus0x) { 6211 // C++03 [class.friend]p2: 6212 // An elaborated-type-specifier shall be used in a friend declaration 6213 // for a class.* 6214 // 6215 // * The class-key of the elaborated-type-specifier is required. 6216 if (!ActiveTemplateInstantiations.empty()) { 6217 // Do not complain about the form of friend template types during 6218 // template instantiation; we will already have complained when the 6219 // template was declared. 6220 } else if (!T->isElaboratedTypeSpecifier()) { 6221 // If we evaluated the type to a record type, suggest putting 6222 // a tag in front. 6223 if (const RecordType *RT = T->getAs<RecordType>()) { 6224 RecordDecl *RD = RT->getDecl(); 6225 6226 std::string InsertionText = std::string(" ") + RD->getKindName(); 6227 6228 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6229 << (unsigned) RD->getTagKind() 6230 << T 6231 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6232 InsertionText); 6233 } else { 6234 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6235 << T 6236 << SourceRange(FriendLoc, TypeRange.getEnd()); 6237 } 6238 } else if (T->getAs<EnumType>()) { 6239 Diag(FriendLoc, diag::ext_enum_friend) 6240 << T 6241 << SourceRange(FriendLoc, TypeRange.getEnd()); 6242 } 6243 } 6244 6245 // C++0x [class.friend]p3: 6246 // If the type specifier in a friend declaration designates a (possibly 6247 // cv-qualified) class type, that class is declared as a friend; otherwise, 6248 // the friend declaration is ignored. 6249 6250 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6251 // in [class.friend]p3 that we do not implement. 6252 6253 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6254} 6255 6256/// Handle a friend tag declaration where the scope specifier was 6257/// templated. 6258Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6259 unsigned TagSpec, SourceLocation TagLoc, 6260 CXXScopeSpec &SS, 6261 IdentifierInfo *Name, SourceLocation NameLoc, 6262 AttributeList *Attr, 6263 MultiTemplateParamsArg TempParamLists) { 6264 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6265 6266 bool isExplicitSpecialization = false; 6267 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6268 bool Invalid = false; 6269 6270 if (TemplateParameterList *TemplateParams 6271 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6272 TempParamLists.get(), 6273 TempParamLists.size(), 6274 /*friend*/ true, 6275 isExplicitSpecialization, 6276 Invalid)) { 6277 --NumMatchedTemplateParamLists; 6278 6279 if (TemplateParams->size() > 0) { 6280 // This is a declaration of a class template. 6281 if (Invalid) 6282 return 0; 6283 6284 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6285 SS, Name, NameLoc, Attr, 6286 TemplateParams, AS_public).take(); 6287 } else { 6288 // The "template<>" header is extraneous. 6289 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6290 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6291 isExplicitSpecialization = true; 6292 } 6293 } 6294 6295 if (Invalid) return 0; 6296 6297 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6298 6299 bool isAllExplicitSpecializations = true; 6300 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6301 if (TempParamLists.get()[I]->size()) { 6302 isAllExplicitSpecializations = false; 6303 break; 6304 } 6305 } 6306 6307 // FIXME: don't ignore attributes. 6308 6309 // If it's explicit specializations all the way down, just forget 6310 // about the template header and build an appropriate non-templated 6311 // friend. TODO: for source fidelity, remember the headers. 6312 if (isAllExplicitSpecializations) { 6313 ElaboratedTypeKeyword Keyword 6314 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6315 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6316 TagLoc, SS.getRange(), NameLoc); 6317 if (T.isNull()) 6318 return 0; 6319 6320 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6321 if (isa<DependentNameType>(T)) { 6322 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6323 TL.setKeywordLoc(TagLoc); 6324 TL.setQualifierRange(SS.getRange()); 6325 TL.setNameLoc(NameLoc); 6326 } else { 6327 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6328 TL.setKeywordLoc(TagLoc); 6329 TL.setQualifierRange(SS.getRange()); 6330 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6331 } 6332 6333 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6334 TSI, FriendLoc); 6335 Friend->setAccess(AS_public); 6336 CurContext->addDecl(Friend); 6337 return Friend; 6338 } 6339 6340 // Handle the case of a templated-scope friend class. e.g. 6341 // template <class T> class A<T>::B; 6342 // FIXME: we don't support these right now. 6343 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6344 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6345 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6346 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6347 TL.setKeywordLoc(TagLoc); 6348 TL.setQualifierRange(SS.getRange()); 6349 TL.setNameLoc(NameLoc); 6350 6351 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6352 TSI, FriendLoc); 6353 Friend->setAccess(AS_public); 6354 Friend->setUnsupportedFriend(true); 6355 CurContext->addDecl(Friend); 6356 return Friend; 6357} 6358 6359 6360/// Handle a friend type declaration. This works in tandem with 6361/// ActOnTag. 6362/// 6363/// Notes on friend class templates: 6364/// 6365/// We generally treat friend class declarations as if they were 6366/// declaring a class. So, for example, the elaborated type specifier 6367/// in a friend declaration is required to obey the restrictions of a 6368/// class-head (i.e. no typedefs in the scope chain), template 6369/// parameters are required to match up with simple template-ids, &c. 6370/// However, unlike when declaring a template specialization, it's 6371/// okay to refer to a template specialization without an empty 6372/// template parameter declaration, e.g. 6373/// friend class A<T>::B<unsigned>; 6374/// We permit this as a special case; if there are any template 6375/// parameters present at all, require proper matching, i.e. 6376/// template <> template <class T> friend class A<int>::B; 6377Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6378 MultiTemplateParamsArg TempParams) { 6379 SourceLocation Loc = DS.getSourceRange().getBegin(); 6380 6381 assert(DS.isFriendSpecified()); 6382 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6383 6384 // Try to convert the decl specifier to a type. This works for 6385 // friend templates because ActOnTag never produces a ClassTemplateDecl 6386 // for a TUK_Friend. 6387 Declarator TheDeclarator(DS, Declarator::MemberContext); 6388 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6389 QualType T = TSI->getType(); 6390 if (TheDeclarator.isInvalidType()) 6391 return 0; 6392 6393 // This is definitely an error in C++98. It's probably meant to 6394 // be forbidden in C++0x, too, but the specification is just 6395 // poorly written. 6396 // 6397 // The problem is with declarations like the following: 6398 // template <T> friend A<T>::foo; 6399 // where deciding whether a class C is a friend or not now hinges 6400 // on whether there exists an instantiation of A that causes 6401 // 'foo' to equal C. There are restrictions on class-heads 6402 // (which we declare (by fiat) elaborated friend declarations to 6403 // be) that makes this tractable. 6404 // 6405 // FIXME: handle "template <> friend class A<T>;", which 6406 // is possibly well-formed? Who even knows? 6407 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6408 Diag(Loc, diag::err_tagless_friend_type_template) 6409 << DS.getSourceRange(); 6410 return 0; 6411 } 6412 6413 // C++98 [class.friend]p1: A friend of a class is a function 6414 // or class that is not a member of the class . . . 6415 // This is fixed in DR77, which just barely didn't make the C++03 6416 // deadline. It's also a very silly restriction that seriously 6417 // affects inner classes and which nobody else seems to implement; 6418 // thus we never diagnose it, not even in -pedantic. 6419 // 6420 // But note that we could warn about it: it's always useless to 6421 // friend one of your own members (it's not, however, worthless to 6422 // friend a member of an arbitrary specialization of your template). 6423 6424 Decl *D; 6425 if (unsigned NumTempParamLists = TempParams.size()) 6426 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6427 NumTempParamLists, 6428 TempParams.release(), 6429 TSI, 6430 DS.getFriendSpecLoc()); 6431 else 6432 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6433 6434 if (!D) 6435 return 0; 6436 6437 D->setAccess(AS_public); 6438 CurContext->addDecl(D); 6439 6440 return D; 6441} 6442 6443Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6444 MultiTemplateParamsArg TemplateParams) { 6445 const DeclSpec &DS = D.getDeclSpec(); 6446 6447 assert(DS.isFriendSpecified()); 6448 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6449 6450 SourceLocation Loc = D.getIdentifierLoc(); 6451 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6452 QualType T = TInfo->getType(); 6453 6454 // C++ [class.friend]p1 6455 // A friend of a class is a function or class.... 6456 // Note that this sees through typedefs, which is intended. 6457 // It *doesn't* see through dependent types, which is correct 6458 // according to [temp.arg.type]p3: 6459 // If a declaration acquires a function type through a 6460 // type dependent on a template-parameter and this causes 6461 // a declaration that does not use the syntactic form of a 6462 // function declarator to have a function type, the program 6463 // is ill-formed. 6464 if (!T->isFunctionType()) { 6465 Diag(Loc, diag::err_unexpected_friend); 6466 6467 // It might be worthwhile to try to recover by creating an 6468 // appropriate declaration. 6469 return 0; 6470 } 6471 6472 // C++ [namespace.memdef]p3 6473 // - If a friend declaration in a non-local class first declares a 6474 // class or function, the friend class or function is a member 6475 // of the innermost enclosing namespace. 6476 // - The name of the friend is not found by simple name lookup 6477 // until a matching declaration is provided in that namespace 6478 // scope (either before or after the class declaration granting 6479 // friendship). 6480 // - If a friend function is called, its name may be found by the 6481 // name lookup that considers functions from namespaces and 6482 // classes associated with the types of the function arguments. 6483 // - When looking for a prior declaration of a class or a function 6484 // declared as a friend, scopes outside the innermost enclosing 6485 // namespace scope are not considered. 6486 6487 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6488 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6489 DeclarationName Name = NameInfo.getName(); 6490 assert(Name); 6491 6492 // The context we found the declaration in, or in which we should 6493 // create the declaration. 6494 DeclContext *DC; 6495 Scope *DCScope = S; 6496 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6497 ForRedeclaration); 6498 6499 // FIXME: there are different rules in local classes 6500 6501 // There are four cases here. 6502 // - There's no scope specifier, in which case we just go to the 6503 // appropriate scope and look for a function or function template 6504 // there as appropriate. 6505 // Recover from invalid scope qualifiers as if they just weren't there. 6506 if (SS.isInvalid() || !SS.isSet()) { 6507 // C++0x [namespace.memdef]p3: 6508 // If the name in a friend declaration is neither qualified nor 6509 // a template-id and the declaration is a function or an 6510 // elaborated-type-specifier, the lookup to determine whether 6511 // the entity has been previously declared shall not consider 6512 // any scopes outside the innermost enclosing namespace. 6513 // C++0x [class.friend]p11: 6514 // If a friend declaration appears in a local class and the name 6515 // specified is an unqualified name, a prior declaration is 6516 // looked up without considering scopes that are outside the 6517 // innermost enclosing non-class scope. For a friend function 6518 // declaration, if there is no prior declaration, the program is 6519 // ill-formed. 6520 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6521 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 6522 6523 // Find the appropriate context according to the above. 6524 DC = CurContext; 6525 while (true) { 6526 // Skip class contexts. If someone can cite chapter and verse 6527 // for this behavior, that would be nice --- it's what GCC and 6528 // EDG do, and it seems like a reasonable intent, but the spec 6529 // really only says that checks for unqualified existing 6530 // declarations should stop at the nearest enclosing namespace, 6531 // not that they should only consider the nearest enclosing 6532 // namespace. 6533 while (DC->isRecord()) 6534 DC = DC->getParent(); 6535 6536 LookupQualifiedName(Previous, DC); 6537 6538 // TODO: decide what we think about using declarations. 6539 if (isLocal || !Previous.empty()) 6540 break; 6541 6542 if (isTemplateId) { 6543 if (isa<TranslationUnitDecl>(DC)) break; 6544 } else { 6545 if (DC->isFileContext()) break; 6546 } 6547 DC = DC->getParent(); 6548 } 6549 6550 // C++ [class.friend]p1: A friend of a class is a function or 6551 // class that is not a member of the class . . . 6552 // C++0x changes this for both friend types and functions. 6553 // Most C++ 98 compilers do seem to give an error here, so 6554 // we do, too. 6555 if (!Previous.empty() && DC->Equals(CurContext) 6556 && !getLangOptions().CPlusPlus0x) 6557 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6558 6559 DCScope = getScopeForDeclContext(S, DC); 6560 6561 // - There's a non-dependent scope specifier, in which case we 6562 // compute it and do a previous lookup there for a function 6563 // or function template. 6564 } else if (!SS.getScopeRep()->isDependent()) { 6565 DC = computeDeclContext(SS); 6566 if (!DC) return 0; 6567 6568 if (RequireCompleteDeclContext(SS, DC)) return 0; 6569 6570 LookupQualifiedName(Previous, DC); 6571 6572 // Ignore things found implicitly in the wrong scope. 6573 // TODO: better diagnostics for this case. Suggesting the right 6574 // qualified scope would be nice... 6575 LookupResult::Filter F = Previous.makeFilter(); 6576 while (F.hasNext()) { 6577 NamedDecl *D = F.next(); 6578 if (!DC->InEnclosingNamespaceSetOf( 6579 D->getDeclContext()->getRedeclContext())) 6580 F.erase(); 6581 } 6582 F.done(); 6583 6584 if (Previous.empty()) { 6585 D.setInvalidType(); 6586 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6587 return 0; 6588 } 6589 6590 // C++ [class.friend]p1: A friend of a class is a function or 6591 // class that is not a member of the class . . . 6592 if (DC->Equals(CurContext)) 6593 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6594 6595 // - There's a scope specifier that does not match any template 6596 // parameter lists, in which case we use some arbitrary context, 6597 // create a method or method template, and wait for instantiation. 6598 // - There's a scope specifier that does match some template 6599 // parameter lists, which we don't handle right now. 6600 } else { 6601 DC = CurContext; 6602 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6603 } 6604 6605 if (!DC->isRecord()) { 6606 // This implies that it has to be an operator or function. 6607 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6608 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6609 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6610 Diag(Loc, diag::err_introducing_special_friend) << 6611 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6612 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6613 return 0; 6614 } 6615 } 6616 6617 bool Redeclaration = false; 6618 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6619 move(TemplateParams), 6620 IsDefinition, 6621 Redeclaration); 6622 if (!ND) return 0; 6623 6624 assert(ND->getDeclContext() == DC); 6625 assert(ND->getLexicalDeclContext() == CurContext); 6626 6627 // Add the function declaration to the appropriate lookup tables, 6628 // adjusting the redeclarations list as necessary. We don't 6629 // want to do this yet if the friending class is dependent. 6630 // 6631 // Also update the scope-based lookup if the target context's 6632 // lookup context is in lexical scope. 6633 if (!CurContext->isDependentContext()) { 6634 DC = DC->getRedeclContext(); 6635 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6636 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6637 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6638 } 6639 6640 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6641 D.getIdentifierLoc(), ND, 6642 DS.getFriendSpecLoc()); 6643 FrD->setAccess(AS_public); 6644 CurContext->addDecl(FrD); 6645 6646 if (ND->isInvalidDecl()) 6647 FrD->setInvalidDecl(); 6648 else { 6649 FunctionDecl *FD; 6650 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 6651 FD = FTD->getTemplatedDecl(); 6652 else 6653 FD = cast<FunctionDecl>(ND); 6654 6655 // Mark templated-scope function declarations as unsupported. 6656 if (FD->getNumTemplateParameterLists()) 6657 FrD->setUnsupportedFriend(true); 6658 } 6659 6660 return ND; 6661} 6662 6663void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6664 AdjustDeclIfTemplate(Dcl); 6665 6666 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6667 if (!Fn) { 6668 Diag(DelLoc, diag::err_deleted_non_function); 6669 return; 6670 } 6671 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6672 Diag(DelLoc, diag::err_deleted_decl_not_first); 6673 Diag(Prev->getLocation(), diag::note_previous_declaration); 6674 // If the declaration wasn't the first, we delete the function anyway for 6675 // recovery. 6676 } 6677 Fn->setDeleted(); 6678} 6679 6680static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6681 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6682 ++CI) { 6683 Stmt *SubStmt = *CI; 6684 if (!SubStmt) 6685 continue; 6686 if (isa<ReturnStmt>(SubStmt)) 6687 Self.Diag(SubStmt->getSourceRange().getBegin(), 6688 diag::err_return_in_constructor_handler); 6689 if (!isa<Expr>(SubStmt)) 6690 SearchForReturnInStmt(Self, SubStmt); 6691 } 6692} 6693 6694void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6695 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6696 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6697 SearchForReturnInStmt(*this, Handler); 6698 } 6699} 6700 6701bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6702 const CXXMethodDecl *Old) { 6703 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6704 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6705 6706 if (Context.hasSameType(NewTy, OldTy) || 6707 NewTy->isDependentType() || OldTy->isDependentType()) 6708 return false; 6709 6710 // Check if the return types are covariant 6711 QualType NewClassTy, OldClassTy; 6712 6713 /// Both types must be pointers or references to classes. 6714 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6715 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6716 NewClassTy = NewPT->getPointeeType(); 6717 OldClassTy = OldPT->getPointeeType(); 6718 } 6719 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6720 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6721 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6722 NewClassTy = NewRT->getPointeeType(); 6723 OldClassTy = OldRT->getPointeeType(); 6724 } 6725 } 6726 } 6727 6728 // The return types aren't either both pointers or references to a class type. 6729 if (NewClassTy.isNull()) { 6730 Diag(New->getLocation(), 6731 diag::err_different_return_type_for_overriding_virtual_function) 6732 << New->getDeclName() << NewTy << OldTy; 6733 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6734 6735 return true; 6736 } 6737 6738 // C++ [class.virtual]p6: 6739 // If the return type of D::f differs from the return type of B::f, the 6740 // class type in the return type of D::f shall be complete at the point of 6741 // declaration of D::f or shall be the class type D. 6742 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6743 if (!RT->isBeingDefined() && 6744 RequireCompleteType(New->getLocation(), NewClassTy, 6745 PDiag(diag::err_covariant_return_incomplete) 6746 << New->getDeclName())) 6747 return true; 6748 } 6749 6750 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6751 // Check if the new class derives from the old class. 6752 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6753 Diag(New->getLocation(), 6754 diag::err_covariant_return_not_derived) 6755 << New->getDeclName() << NewTy << OldTy; 6756 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6757 return true; 6758 } 6759 6760 // Check if we the conversion from derived to base is valid. 6761 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6762 diag::err_covariant_return_inaccessible_base, 6763 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6764 // FIXME: Should this point to the return type? 6765 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6766 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6767 return true; 6768 } 6769 } 6770 6771 // The qualifiers of the return types must be the same. 6772 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6773 Diag(New->getLocation(), 6774 diag::err_covariant_return_type_different_qualifications) 6775 << New->getDeclName() << NewTy << OldTy; 6776 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6777 return true; 6778 }; 6779 6780 6781 // The new class type must have the same or less qualifiers as the old type. 6782 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6783 Diag(New->getLocation(), 6784 diag::err_covariant_return_type_class_type_more_qualified) 6785 << New->getDeclName() << NewTy << OldTy; 6786 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6787 return true; 6788 }; 6789 6790 return false; 6791} 6792 6793bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6794 const CXXMethodDecl *Old) 6795{ 6796 if (Old->hasAttr<FinalAttr>()) { 6797 Diag(New->getLocation(), diag::err_final_function_overridden) 6798 << New->getDeclName(); 6799 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6800 return true; 6801 } 6802 6803 return false; 6804} 6805 6806/// \brief Mark the given method pure. 6807/// 6808/// \param Method the method to be marked pure. 6809/// 6810/// \param InitRange the source range that covers the "0" initializer. 6811bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6812 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6813 Method->setPure(); 6814 return false; 6815 } 6816 6817 if (!Method->isInvalidDecl()) 6818 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6819 << Method->getDeclName() << InitRange; 6820 return true; 6821} 6822 6823/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6824/// an initializer for the out-of-line declaration 'Dcl'. The scope 6825/// is a fresh scope pushed for just this purpose. 6826/// 6827/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6828/// static data member of class X, names should be looked up in the scope of 6829/// class X. 6830void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6831 // If there is no declaration, there was an error parsing it. 6832 if (D == 0) return; 6833 6834 // We should only get called for declarations with scope specifiers, like: 6835 // int foo::bar; 6836 assert(D->isOutOfLine()); 6837 EnterDeclaratorContext(S, D->getDeclContext()); 6838} 6839 6840/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6841/// initializer for the out-of-line declaration 'D'. 6842void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6843 // If there is no declaration, there was an error parsing it. 6844 if (D == 0) return; 6845 6846 assert(D->isOutOfLine()); 6847 ExitDeclaratorContext(S); 6848} 6849 6850/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6851/// C++ if/switch/while/for statement. 6852/// e.g: "if (int x = f()) {...}" 6853DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6854 // C++ 6.4p2: 6855 // The declarator shall not specify a function or an array. 6856 // The type-specifier-seq shall not contain typedef and shall not declare a 6857 // new class or enumeration. 6858 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6859 "Parser allowed 'typedef' as storage class of condition decl."); 6860 6861 TagDecl *OwnedTag = 0; 6862 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6863 QualType Ty = TInfo->getType(); 6864 6865 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6866 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6867 // would be created and CXXConditionDeclExpr wants a VarDecl. 6868 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6869 << D.getSourceRange(); 6870 return DeclResult(); 6871 } else if (OwnedTag && OwnedTag->isDefinition()) { 6872 // The type-specifier-seq shall not declare a new class or enumeration. 6873 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6874 } 6875 6876 Decl *Dcl = ActOnDeclarator(S, D); 6877 if (!Dcl) 6878 return DeclResult(); 6879 6880 return Dcl; 6881} 6882 6883void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6884 bool DefinitionRequired) { 6885 // Ignore any vtable uses in unevaluated operands or for classes that do 6886 // not have a vtable. 6887 if (!Class->isDynamicClass() || Class->isDependentContext() || 6888 CurContext->isDependentContext() || 6889 ExprEvalContexts.back().Context == Unevaluated) 6890 return; 6891 6892 // Try to insert this class into the map. 6893 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6894 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6895 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6896 if (!Pos.second) { 6897 // If we already had an entry, check to see if we are promoting this vtable 6898 // to required a definition. If so, we need to reappend to the VTableUses 6899 // list, since we may have already processed the first entry. 6900 if (DefinitionRequired && !Pos.first->second) { 6901 Pos.first->second = true; 6902 } else { 6903 // Otherwise, we can early exit. 6904 return; 6905 } 6906 } 6907 6908 // Local classes need to have their virtual members marked 6909 // immediately. For all other classes, we mark their virtual members 6910 // at the end of the translation unit. 6911 if (Class->isLocalClass()) 6912 MarkVirtualMembersReferenced(Loc, Class); 6913 else 6914 VTableUses.push_back(std::make_pair(Class, Loc)); 6915} 6916 6917bool Sema::DefineUsedVTables() { 6918 // If any dynamic classes have their key function defined within 6919 // this translation unit, then those vtables are considered "used" and must 6920 // be emitted. 6921 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6922 if (const CXXMethodDecl *KeyFunction 6923 = Context.getKeyFunction(DynamicClasses[I])) { 6924 const FunctionDecl *Definition = 0; 6925 if (KeyFunction->hasBody(Definition)) 6926 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6927 } 6928 } 6929 6930 if (VTableUses.empty()) 6931 return false; 6932 6933 // Note: The VTableUses vector could grow as a result of marking 6934 // the members of a class as "used", so we check the size each 6935 // time through the loop and prefer indices (with are stable) to 6936 // iterators (which are not). 6937 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6938 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6939 if (!Class) 6940 continue; 6941 6942 SourceLocation Loc = VTableUses[I].second; 6943 6944 // If this class has a key function, but that key function is 6945 // defined in another translation unit, we don't need to emit the 6946 // vtable even though we're using it. 6947 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6948 if (KeyFunction && !KeyFunction->hasBody()) { 6949 switch (KeyFunction->getTemplateSpecializationKind()) { 6950 case TSK_Undeclared: 6951 case TSK_ExplicitSpecialization: 6952 case TSK_ExplicitInstantiationDeclaration: 6953 // The key function is in another translation unit. 6954 continue; 6955 6956 case TSK_ExplicitInstantiationDefinition: 6957 case TSK_ImplicitInstantiation: 6958 // We will be instantiating the key function. 6959 break; 6960 } 6961 } else if (!KeyFunction) { 6962 // If we have a class with no key function that is the subject 6963 // of an explicit instantiation declaration, suppress the 6964 // vtable; it will live with the explicit instantiation 6965 // definition. 6966 bool IsExplicitInstantiationDeclaration 6967 = Class->getTemplateSpecializationKind() 6968 == TSK_ExplicitInstantiationDeclaration; 6969 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6970 REnd = Class->redecls_end(); 6971 R != REnd; ++R) { 6972 TemplateSpecializationKind TSK 6973 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6974 if (TSK == TSK_ExplicitInstantiationDeclaration) 6975 IsExplicitInstantiationDeclaration = true; 6976 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6977 IsExplicitInstantiationDeclaration = false; 6978 break; 6979 } 6980 } 6981 6982 if (IsExplicitInstantiationDeclaration) 6983 continue; 6984 } 6985 6986 // Mark all of the virtual members of this class as referenced, so 6987 // that we can build a vtable. Then, tell the AST consumer that a 6988 // vtable for this class is required. 6989 MarkVirtualMembersReferenced(Loc, Class); 6990 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6991 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6992 6993 // Optionally warn if we're emitting a weak vtable. 6994 if (Class->getLinkage() == ExternalLinkage && 6995 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6996 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6997 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6998 } 6999 } 7000 VTableUses.clear(); 7001 7002 return true; 7003} 7004 7005void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7006 const CXXRecordDecl *RD) { 7007 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7008 e = RD->method_end(); i != e; ++i) { 7009 CXXMethodDecl *MD = *i; 7010 7011 // C++ [basic.def.odr]p2: 7012 // [...] A virtual member function is used if it is not pure. [...] 7013 if (MD->isVirtual() && !MD->isPure()) 7014 MarkDeclarationReferenced(Loc, MD); 7015 } 7016 7017 // Only classes that have virtual bases need a VTT. 7018 if (RD->getNumVBases() == 0) 7019 return; 7020 7021 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7022 e = RD->bases_end(); i != e; ++i) { 7023 const CXXRecordDecl *Base = 7024 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7025 if (Base->getNumVBases() == 0) 7026 continue; 7027 MarkVirtualMembersReferenced(Loc, Base); 7028 } 7029} 7030 7031/// SetIvarInitializers - This routine builds initialization ASTs for the 7032/// Objective-C implementation whose ivars need be initialized. 7033void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7034 if (!getLangOptions().CPlusPlus) 7035 return; 7036 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7037 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7038 CollectIvarsToConstructOrDestruct(OID, ivars); 7039 if (ivars.empty()) 7040 return; 7041 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 7042 for (unsigned i = 0; i < ivars.size(); i++) { 7043 FieldDecl *Field = ivars[i]; 7044 if (Field->isInvalidDecl()) 7045 continue; 7046 7047 CXXBaseOrMemberInitializer *Member; 7048 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7049 InitializationKind InitKind = 7050 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7051 7052 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7053 ExprResult MemberInit = 7054 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7055 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 7056 // Note, MemberInit could actually come back empty if no initialization 7057 // is required (e.g., because it would call a trivial default constructor) 7058 if (!MemberInit.get() || MemberInit.isInvalid()) 7059 continue; 7060 7061 Member = 7062 new (Context) CXXBaseOrMemberInitializer(Context, 7063 Field, SourceLocation(), 7064 SourceLocation(), 7065 MemberInit.takeAs<Expr>(), 7066 SourceLocation()); 7067 AllToInit.push_back(Member); 7068 7069 // Be sure that the destructor is accessible and is marked as referenced. 7070 if (const RecordType *RecordTy 7071 = Context.getBaseElementType(Field->getType()) 7072 ->getAs<RecordType>()) { 7073 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7074 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7075 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7076 CheckDestructorAccess(Field->getLocation(), Destructor, 7077 PDiag(diag::err_access_dtor_ivar) 7078 << Context.getBaseElementType(Field->getType())); 7079 } 7080 } 7081 } 7082 ObjCImplementation->setIvarInitializers(Context, 7083 AllToInit.data(), AllToInit.size()); 7084 } 7085} 7086