SemaDeclCXX.cpp revision f90b27ad077c3339b62befc892382845339f9490
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check for unexpanded parameter packs. 181 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 182 Param->setInvalidDecl(); 183 return; 184 } 185 186 // Check that the default argument is well-formed 187 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 188 if (DefaultArgChecker.Visit(DefaultArg)) { 189 Param->setInvalidDecl(); 190 return; 191 } 192 193 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 194} 195 196/// ActOnParamUnparsedDefaultArgument - We've seen a default 197/// argument for a function parameter, but we can't parse it yet 198/// because we're inside a class definition. Note that this default 199/// argument will be parsed later. 200void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 201 SourceLocation EqualLoc, 202 SourceLocation ArgLoc) { 203 if (!param) 204 return; 205 206 ParmVarDecl *Param = cast<ParmVarDecl>(param); 207 if (Param) 208 Param->setUnparsedDefaultArg(); 209 210 UnparsedDefaultArgLocs[Param] = ArgLoc; 211} 212 213/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 214/// the default argument for the parameter param failed. 215void Sema::ActOnParamDefaultArgumentError(Decl *param) { 216 if (!param) 217 return; 218 219 ParmVarDecl *Param = cast<ParmVarDecl>(param); 220 221 Param->setInvalidDecl(); 222 223 UnparsedDefaultArgLocs.erase(Param); 224} 225 226/// CheckExtraCXXDefaultArguments - Check for any extra default 227/// arguments in the declarator, which is not a function declaration 228/// or definition and therefore is not permitted to have default 229/// arguments. This routine should be invoked for every declarator 230/// that is not a function declaration or definition. 231void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 232 // C++ [dcl.fct.default]p3 233 // A default argument expression shall be specified only in the 234 // parameter-declaration-clause of a function declaration or in a 235 // template-parameter (14.1). It shall not be specified for a 236 // parameter pack. If it is specified in a 237 // parameter-declaration-clause, it shall not occur within a 238 // declarator or abstract-declarator of a parameter-declaration. 239 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 240 DeclaratorChunk &chunk = D.getTypeObject(i); 241 if (chunk.Kind == DeclaratorChunk::Function) { 242 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 243 ParmVarDecl *Param = 244 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 245 if (Param->hasUnparsedDefaultArg()) { 246 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 247 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 248 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 249 delete Toks; 250 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 251 } else if (Param->getDefaultArg()) { 252 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 253 << Param->getDefaultArg()->getSourceRange(); 254 Param->setDefaultArg(0); 255 } 256 } 257 } 258 } 259} 260 261// MergeCXXFunctionDecl - Merge two declarations of the same C++ 262// function, once we already know that they have the same 263// type. Subroutine of MergeFunctionDecl. Returns true if there was an 264// error, false otherwise. 265bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 266 bool Invalid = false; 267 268 // C++ [dcl.fct.default]p4: 269 // For non-template functions, default arguments can be added in 270 // later declarations of a function in the same 271 // scope. Declarations in different scopes have completely 272 // distinct sets of default arguments. That is, declarations in 273 // inner scopes do not acquire default arguments from 274 // declarations in outer scopes, and vice versa. In a given 275 // function declaration, all parameters subsequent to a 276 // parameter with a default argument shall have default 277 // arguments supplied in this or previous declarations. A 278 // default argument shall not be redefined by a later 279 // declaration (not even to the same value). 280 // 281 // C++ [dcl.fct.default]p6: 282 // Except for member functions of class templates, the default arguments 283 // in a member function definition that appears outside of the class 284 // definition are added to the set of default arguments provided by the 285 // member function declaration in the class definition. 286 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 287 ParmVarDecl *OldParam = Old->getParamDecl(p); 288 ParmVarDecl *NewParam = New->getParamDecl(p); 289 290 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 291 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 292 // hint here. Alternatively, we could walk the type-source information 293 // for NewParam to find the last source location in the type... but it 294 // isn't worth the effort right now. This is the kind of test case that 295 // is hard to get right: 296 297 // int f(int); 298 // void g(int (*fp)(int) = f); 299 // void g(int (*fp)(int) = &f); 300 Diag(NewParam->getLocation(), 301 diag::err_param_default_argument_redefinition) 302 << NewParam->getDefaultArgRange(); 303 304 // Look for the function declaration where the default argument was 305 // actually written, which may be a declaration prior to Old. 306 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 307 Older; Older = Older->getPreviousDeclaration()) { 308 if (!Older->getParamDecl(p)->hasDefaultArg()) 309 break; 310 311 OldParam = Older->getParamDecl(p); 312 } 313 314 Diag(OldParam->getLocation(), diag::note_previous_definition) 315 << OldParam->getDefaultArgRange(); 316 Invalid = true; 317 } else if (OldParam->hasDefaultArg()) { 318 // Merge the old default argument into the new parameter. 319 // It's important to use getInit() here; getDefaultArg() 320 // strips off any top-level ExprWithCleanups. 321 NewParam->setHasInheritedDefaultArg(); 322 if (OldParam->hasUninstantiatedDefaultArg()) 323 NewParam->setUninstantiatedDefaultArg( 324 OldParam->getUninstantiatedDefaultArg()); 325 else 326 NewParam->setDefaultArg(OldParam->getInit()); 327 } else if (NewParam->hasDefaultArg()) { 328 if (New->getDescribedFunctionTemplate()) { 329 // Paragraph 4, quoted above, only applies to non-template functions. 330 Diag(NewParam->getLocation(), 331 diag::err_param_default_argument_template_redecl) 332 << NewParam->getDefaultArgRange(); 333 Diag(Old->getLocation(), diag::note_template_prev_declaration) 334 << false; 335 } else if (New->getTemplateSpecializationKind() 336 != TSK_ImplicitInstantiation && 337 New->getTemplateSpecializationKind() != TSK_Undeclared) { 338 // C++ [temp.expr.spec]p21: 339 // Default function arguments shall not be specified in a declaration 340 // or a definition for one of the following explicit specializations: 341 // - the explicit specialization of a function template; 342 // - the explicit specialization of a member function template; 343 // - the explicit specialization of a member function of a class 344 // template where the class template specialization to which the 345 // member function specialization belongs is implicitly 346 // instantiated. 347 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 348 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 349 << New->getDeclName() 350 << NewParam->getDefaultArgRange(); 351 } else if (New->getDeclContext()->isDependentContext()) { 352 // C++ [dcl.fct.default]p6 (DR217): 353 // Default arguments for a member function of a class template shall 354 // be specified on the initial declaration of the member function 355 // within the class template. 356 // 357 // Reading the tea leaves a bit in DR217 and its reference to DR205 358 // leads me to the conclusion that one cannot add default function 359 // arguments for an out-of-line definition of a member function of a 360 // dependent type. 361 int WhichKind = 2; 362 if (CXXRecordDecl *Record 363 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 364 if (Record->getDescribedClassTemplate()) 365 WhichKind = 0; 366 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 367 WhichKind = 1; 368 else 369 WhichKind = 2; 370 } 371 372 Diag(NewParam->getLocation(), 373 diag::err_param_default_argument_member_template_redecl) 374 << WhichKind 375 << NewParam->getDefaultArgRange(); 376 } 377 } 378 } 379 380 if (CheckEquivalentExceptionSpec(Old, New)) 381 Invalid = true; 382 383 return Invalid; 384} 385 386/// CheckCXXDefaultArguments - Verify that the default arguments for a 387/// function declaration are well-formed according to C++ 388/// [dcl.fct.default]. 389void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 390 unsigned NumParams = FD->getNumParams(); 391 unsigned p; 392 393 // Find first parameter with a default argument 394 for (p = 0; p < NumParams; ++p) { 395 ParmVarDecl *Param = FD->getParamDecl(p); 396 if (Param->hasDefaultArg()) 397 break; 398 } 399 400 // C++ [dcl.fct.default]p4: 401 // In a given function declaration, all parameters 402 // subsequent to a parameter with a default argument shall 403 // have default arguments supplied in this or previous 404 // declarations. A default argument shall not be redefined 405 // by a later declaration (not even to the same value). 406 unsigned LastMissingDefaultArg = 0; 407 for (; p < NumParams; ++p) { 408 ParmVarDecl *Param = FD->getParamDecl(p); 409 if (!Param->hasDefaultArg()) { 410 if (Param->isInvalidDecl()) 411 /* We already complained about this parameter. */; 412 else if (Param->getIdentifier()) 413 Diag(Param->getLocation(), 414 diag::err_param_default_argument_missing_name) 415 << Param->getIdentifier(); 416 else 417 Diag(Param->getLocation(), 418 diag::err_param_default_argument_missing); 419 420 LastMissingDefaultArg = p; 421 } 422 } 423 424 if (LastMissingDefaultArg > 0) { 425 // Some default arguments were missing. Clear out all of the 426 // default arguments up to (and including) the last missing 427 // default argument, so that we leave the function parameters 428 // in a semantically valid state. 429 for (p = 0; p <= LastMissingDefaultArg; ++p) { 430 ParmVarDecl *Param = FD->getParamDecl(p); 431 if (Param->hasDefaultArg()) { 432 Param->setDefaultArg(0); 433 } 434 } 435 } 436} 437 438/// isCurrentClassName - Determine whether the identifier II is the 439/// name of the class type currently being defined. In the case of 440/// nested classes, this will only return true if II is the name of 441/// the innermost class. 442bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 443 const CXXScopeSpec *SS) { 444 assert(getLangOptions().CPlusPlus && "No class names in C!"); 445 446 CXXRecordDecl *CurDecl; 447 if (SS && SS->isSet() && !SS->isInvalid()) { 448 DeclContext *DC = computeDeclContext(*SS, true); 449 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 450 } else 451 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 452 453 if (CurDecl && CurDecl->getIdentifier()) 454 return &II == CurDecl->getIdentifier(); 455 else 456 return false; 457} 458 459/// \brief Check the validity of a C++ base class specifier. 460/// 461/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 462/// and returns NULL otherwise. 463CXXBaseSpecifier * 464Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 465 SourceRange SpecifierRange, 466 bool Virtual, AccessSpecifier Access, 467 TypeSourceInfo *TInfo, 468 SourceLocation EllipsisLoc) { 469 QualType BaseType = TInfo->getType(); 470 471 // C++ [class.union]p1: 472 // A union shall not have base classes. 473 if (Class->isUnion()) { 474 Diag(Class->getLocation(), diag::err_base_clause_on_union) 475 << SpecifierRange; 476 return 0; 477 } 478 479 if (EllipsisLoc.isValid() && 480 !TInfo->getType()->containsUnexpandedParameterPack()) { 481 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 482 << TInfo->getTypeLoc().getSourceRange(); 483 EllipsisLoc = SourceLocation(); 484 } 485 486 if (BaseType->isDependentType()) 487 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 488 Class->getTagKind() == TTK_Class, 489 Access, TInfo, EllipsisLoc); 490 491 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 492 493 // Base specifiers must be record types. 494 if (!BaseType->isRecordType()) { 495 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 496 return 0; 497 } 498 499 // C++ [class.union]p1: 500 // A union shall not be used as a base class. 501 if (BaseType->isUnionType()) { 502 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 503 return 0; 504 } 505 506 // C++ [class.derived]p2: 507 // The class-name in a base-specifier shall not be an incompletely 508 // defined class. 509 if (RequireCompleteType(BaseLoc, BaseType, 510 PDiag(diag::err_incomplete_base_class) 511 << SpecifierRange)) { 512 Class->setInvalidDecl(); 513 return 0; 514 } 515 516 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 517 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 518 assert(BaseDecl && "Record type has no declaration"); 519 BaseDecl = BaseDecl->getDefinition(); 520 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 521 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 522 assert(CXXBaseDecl && "Base type is not a C++ type"); 523 524 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 525 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 526 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 527 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 528 << BaseType; 529 return 0; 530 } 531 532 if (BaseDecl->isInvalidDecl()) 533 Class->setInvalidDecl(); 534 535 // Create the base specifier. 536 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 537 Class->getTagKind() == TTK_Class, 538 Access, TInfo, EllipsisLoc); 539} 540 541/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 542/// one entry in the base class list of a class specifier, for 543/// example: 544/// class foo : public bar, virtual private baz { 545/// 'public bar' and 'virtual private baz' are each base-specifiers. 546BaseResult 547Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 548 bool Virtual, AccessSpecifier Access, 549 ParsedType basetype, SourceLocation BaseLoc, 550 SourceLocation EllipsisLoc) { 551 if (!classdecl) 552 return true; 553 554 AdjustDeclIfTemplate(classdecl); 555 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 556 if (!Class) 557 return true; 558 559 TypeSourceInfo *TInfo = 0; 560 GetTypeFromParser(basetype, &TInfo); 561 562 if (EllipsisLoc.isInvalid() && 563 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 564 UPPC_BaseType)) 565 return true; 566 567 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 568 Virtual, Access, TInfo, 569 EllipsisLoc)) 570 return BaseSpec; 571 572 return true; 573} 574 575/// \brief Performs the actual work of attaching the given base class 576/// specifiers to a C++ class. 577bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 578 unsigned NumBases) { 579 if (NumBases == 0) 580 return false; 581 582 // Used to keep track of which base types we have already seen, so 583 // that we can properly diagnose redundant direct base types. Note 584 // that the key is always the unqualified canonical type of the base 585 // class. 586 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 587 588 // Copy non-redundant base specifiers into permanent storage. 589 unsigned NumGoodBases = 0; 590 bool Invalid = false; 591 for (unsigned idx = 0; idx < NumBases; ++idx) { 592 QualType NewBaseType 593 = Context.getCanonicalType(Bases[idx]->getType()); 594 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 595 if (!Class->hasObjectMember()) { 596 if (const RecordType *FDTTy = 597 NewBaseType.getTypePtr()->getAs<RecordType>()) 598 if (FDTTy->getDecl()->hasObjectMember()) 599 Class->setHasObjectMember(true); 600 } 601 602 if (KnownBaseTypes[NewBaseType]) { 603 // C++ [class.mi]p3: 604 // A class shall not be specified as a direct base class of a 605 // derived class more than once. 606 Diag(Bases[idx]->getSourceRange().getBegin(), 607 diag::err_duplicate_base_class) 608 << KnownBaseTypes[NewBaseType]->getType() 609 << Bases[idx]->getSourceRange(); 610 611 // Delete the duplicate base class specifier; we're going to 612 // overwrite its pointer later. 613 Context.Deallocate(Bases[idx]); 614 615 Invalid = true; 616 } else { 617 // Okay, add this new base class. 618 KnownBaseTypes[NewBaseType] = Bases[idx]; 619 Bases[NumGoodBases++] = Bases[idx]; 620 } 621 } 622 623 // Attach the remaining base class specifiers to the derived class. 624 Class->setBases(Bases, NumGoodBases); 625 626 // Delete the remaining (good) base class specifiers, since their 627 // data has been copied into the CXXRecordDecl. 628 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 629 Context.Deallocate(Bases[idx]); 630 631 return Invalid; 632} 633 634/// ActOnBaseSpecifiers - Attach the given base specifiers to the 635/// class, after checking whether there are any duplicate base 636/// classes. 637void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 638 unsigned NumBases) { 639 if (!ClassDecl || !Bases || !NumBases) 640 return; 641 642 AdjustDeclIfTemplate(ClassDecl); 643 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 644 (CXXBaseSpecifier**)(Bases), NumBases); 645} 646 647static CXXRecordDecl *GetClassForType(QualType T) { 648 if (const RecordType *RT = T->getAs<RecordType>()) 649 return cast<CXXRecordDecl>(RT->getDecl()); 650 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 651 return ICT->getDecl(); 652 else 653 return 0; 654} 655 656/// \brief Determine whether the type \p Derived is a C++ class that is 657/// derived from the type \p Base. 658bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 659 if (!getLangOptions().CPlusPlus) 660 return false; 661 662 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 663 if (!DerivedRD) 664 return false; 665 666 CXXRecordDecl *BaseRD = GetClassForType(Base); 667 if (!BaseRD) 668 return false; 669 670 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 671 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 672} 673 674/// \brief Determine whether the type \p Derived is a C++ class that is 675/// derived from the type \p Base. 676bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 677 if (!getLangOptions().CPlusPlus) 678 return false; 679 680 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 681 if (!DerivedRD) 682 return false; 683 684 CXXRecordDecl *BaseRD = GetClassForType(Base); 685 if (!BaseRD) 686 return false; 687 688 return DerivedRD->isDerivedFrom(BaseRD, Paths); 689} 690 691void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 692 CXXCastPath &BasePathArray) { 693 assert(BasePathArray.empty() && "Base path array must be empty!"); 694 assert(Paths.isRecordingPaths() && "Must record paths!"); 695 696 const CXXBasePath &Path = Paths.front(); 697 698 // We first go backward and check if we have a virtual base. 699 // FIXME: It would be better if CXXBasePath had the base specifier for 700 // the nearest virtual base. 701 unsigned Start = 0; 702 for (unsigned I = Path.size(); I != 0; --I) { 703 if (Path[I - 1].Base->isVirtual()) { 704 Start = I - 1; 705 break; 706 } 707 } 708 709 // Now add all bases. 710 for (unsigned I = Start, E = Path.size(); I != E; ++I) 711 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 712} 713 714/// \brief Determine whether the given base path includes a virtual 715/// base class. 716bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 717 for (CXXCastPath::const_iterator B = BasePath.begin(), 718 BEnd = BasePath.end(); 719 B != BEnd; ++B) 720 if ((*B)->isVirtual()) 721 return true; 722 723 return false; 724} 725 726/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 727/// conversion (where Derived and Base are class types) is 728/// well-formed, meaning that the conversion is unambiguous (and 729/// that all of the base classes are accessible). Returns true 730/// and emits a diagnostic if the code is ill-formed, returns false 731/// otherwise. Loc is the location where this routine should point to 732/// if there is an error, and Range is the source range to highlight 733/// if there is an error. 734bool 735Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 736 unsigned InaccessibleBaseID, 737 unsigned AmbigiousBaseConvID, 738 SourceLocation Loc, SourceRange Range, 739 DeclarationName Name, 740 CXXCastPath *BasePath) { 741 // First, determine whether the path from Derived to Base is 742 // ambiguous. This is slightly more expensive than checking whether 743 // the Derived to Base conversion exists, because here we need to 744 // explore multiple paths to determine if there is an ambiguity. 745 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 746 /*DetectVirtual=*/false); 747 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 748 assert(DerivationOkay && 749 "Can only be used with a derived-to-base conversion"); 750 (void)DerivationOkay; 751 752 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 753 if (InaccessibleBaseID) { 754 // Check that the base class can be accessed. 755 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 756 InaccessibleBaseID)) { 757 case AR_inaccessible: 758 return true; 759 case AR_accessible: 760 case AR_dependent: 761 case AR_delayed: 762 break; 763 } 764 } 765 766 // Build a base path if necessary. 767 if (BasePath) 768 BuildBasePathArray(Paths, *BasePath); 769 return false; 770 } 771 772 // We know that the derived-to-base conversion is ambiguous, and 773 // we're going to produce a diagnostic. Perform the derived-to-base 774 // search just one more time to compute all of the possible paths so 775 // that we can print them out. This is more expensive than any of 776 // the previous derived-to-base checks we've done, but at this point 777 // performance isn't as much of an issue. 778 Paths.clear(); 779 Paths.setRecordingPaths(true); 780 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 781 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 782 (void)StillOkay; 783 784 // Build up a textual representation of the ambiguous paths, e.g., 785 // D -> B -> A, that will be used to illustrate the ambiguous 786 // conversions in the diagnostic. We only print one of the paths 787 // to each base class subobject. 788 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 789 790 Diag(Loc, AmbigiousBaseConvID) 791 << Derived << Base << PathDisplayStr << Range << Name; 792 return true; 793} 794 795bool 796Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 797 SourceLocation Loc, SourceRange Range, 798 CXXCastPath *BasePath, 799 bool IgnoreAccess) { 800 return CheckDerivedToBaseConversion(Derived, Base, 801 IgnoreAccess ? 0 802 : diag::err_upcast_to_inaccessible_base, 803 diag::err_ambiguous_derived_to_base_conv, 804 Loc, Range, DeclarationName(), 805 BasePath); 806} 807 808 809/// @brief Builds a string representing ambiguous paths from a 810/// specific derived class to different subobjects of the same base 811/// class. 812/// 813/// This function builds a string that can be used in error messages 814/// to show the different paths that one can take through the 815/// inheritance hierarchy to go from the derived class to different 816/// subobjects of a base class. The result looks something like this: 817/// @code 818/// struct D -> struct B -> struct A 819/// struct D -> struct C -> struct A 820/// @endcode 821std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 822 std::string PathDisplayStr; 823 std::set<unsigned> DisplayedPaths; 824 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 825 Path != Paths.end(); ++Path) { 826 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 827 // We haven't displayed a path to this particular base 828 // class subobject yet. 829 PathDisplayStr += "\n "; 830 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 831 for (CXXBasePath::const_iterator Element = Path->begin(); 832 Element != Path->end(); ++Element) 833 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 834 } 835 } 836 837 return PathDisplayStr; 838} 839 840//===----------------------------------------------------------------------===// 841// C++ class member Handling 842//===----------------------------------------------------------------------===// 843 844/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 845Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 846 SourceLocation ASLoc, 847 SourceLocation ColonLoc) { 848 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 849 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 850 ASLoc, ColonLoc); 851 CurContext->addHiddenDecl(ASDecl); 852 return ASDecl; 853} 854 855/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 856/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 857/// bitfield width if there is one and 'InitExpr' specifies the initializer if 858/// any. 859Decl * 860Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 861 MultiTemplateParamsArg TemplateParameterLists, 862 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 863 bool Deleted) { 864 const DeclSpec &DS = D.getDeclSpec(); 865 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 866 DeclarationName Name = NameInfo.getName(); 867 SourceLocation Loc = NameInfo.getLoc(); 868 869 // For anonymous bitfields, the location should point to the type. 870 if (Loc.isInvalid()) 871 Loc = D.getSourceRange().getBegin(); 872 873 Expr *BitWidth = static_cast<Expr*>(BW); 874 Expr *Init = static_cast<Expr*>(InitExpr); 875 876 assert(isa<CXXRecordDecl>(CurContext)); 877 assert(!DS.isFriendSpecified()); 878 879 bool isFunc = false; 880 if (D.isFunctionDeclarator()) 881 isFunc = true; 882 else if (D.getNumTypeObjects() == 0 && 883 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 884 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 885 isFunc = TDType->isFunctionType(); 886 } 887 888 // C++ 9.2p6: A member shall not be declared to have automatic storage 889 // duration (auto, register) or with the extern storage-class-specifier. 890 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 891 // data members and cannot be applied to names declared const or static, 892 // and cannot be applied to reference members. 893 switch (DS.getStorageClassSpec()) { 894 case DeclSpec::SCS_unspecified: 895 case DeclSpec::SCS_typedef: 896 case DeclSpec::SCS_static: 897 // FALL THROUGH. 898 break; 899 case DeclSpec::SCS_mutable: 900 if (isFunc) { 901 if (DS.getStorageClassSpecLoc().isValid()) 902 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 903 else 904 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 905 906 // FIXME: It would be nicer if the keyword was ignored only for this 907 // declarator. Otherwise we could get follow-up errors. 908 D.getMutableDeclSpec().ClearStorageClassSpecs(); 909 } 910 break; 911 default: 912 if (DS.getStorageClassSpecLoc().isValid()) 913 Diag(DS.getStorageClassSpecLoc(), 914 diag::err_storageclass_invalid_for_member); 915 else 916 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 917 D.getMutableDeclSpec().ClearStorageClassSpecs(); 918 } 919 920 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 921 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 922 !isFunc); 923 924 Decl *Member; 925 if (isInstField) { 926 CXXScopeSpec &SS = D.getCXXScopeSpec(); 927 928 929 if (SS.isSet() && !SS.isInvalid()) { 930 // The user provided a superfluous scope specifier inside a class 931 // definition: 932 // 933 // class X { 934 // int X::member; 935 // }; 936 DeclContext *DC = 0; 937 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 938 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 939 << Name << FixItHint::CreateRemoval(SS.getRange()); 940 else 941 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 942 << Name << SS.getRange(); 943 944 SS.clear(); 945 } 946 947 // FIXME: Check for template parameters! 948 // FIXME: Check that the name is an identifier! 949 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 950 AS); 951 assert(Member && "HandleField never returns null"); 952 } else { 953 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 954 if (!Member) { 955 return 0; 956 } 957 958 // Non-instance-fields can't have a bitfield. 959 if (BitWidth) { 960 if (Member->isInvalidDecl()) { 961 // don't emit another diagnostic. 962 } else if (isa<VarDecl>(Member)) { 963 // C++ 9.6p3: A bit-field shall not be a static member. 964 // "static member 'A' cannot be a bit-field" 965 Diag(Loc, diag::err_static_not_bitfield) 966 << Name << BitWidth->getSourceRange(); 967 } else if (isa<TypedefDecl>(Member)) { 968 // "typedef member 'x' cannot be a bit-field" 969 Diag(Loc, diag::err_typedef_not_bitfield) 970 << Name << BitWidth->getSourceRange(); 971 } else { 972 // A function typedef ("typedef int f(); f a;"). 973 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 974 Diag(Loc, diag::err_not_integral_type_bitfield) 975 << Name << cast<ValueDecl>(Member)->getType() 976 << BitWidth->getSourceRange(); 977 } 978 979 BitWidth = 0; 980 Member->setInvalidDecl(); 981 } 982 983 Member->setAccess(AS); 984 985 // If we have declared a member function template, set the access of the 986 // templated declaration as well. 987 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 988 FunTmpl->getTemplatedDecl()->setAccess(AS); 989 } 990 991 assert((Name || isInstField) && "No identifier for non-field ?"); 992 993 if (Init) 994 AddInitializerToDecl(Member, Init, false); 995 if (Deleted) // FIXME: Source location is not very good. 996 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 997 998 if (isInstField) { 999 FieldCollector->Add(cast<FieldDecl>(Member)); 1000 return 0; 1001 } 1002 return Member; 1003} 1004 1005/// \brief Find the direct and/or virtual base specifiers that 1006/// correspond to the given base type, for use in base initialization 1007/// within a constructor. 1008static bool FindBaseInitializer(Sema &SemaRef, 1009 CXXRecordDecl *ClassDecl, 1010 QualType BaseType, 1011 const CXXBaseSpecifier *&DirectBaseSpec, 1012 const CXXBaseSpecifier *&VirtualBaseSpec) { 1013 // First, check for a direct base class. 1014 DirectBaseSpec = 0; 1015 for (CXXRecordDecl::base_class_const_iterator Base 1016 = ClassDecl->bases_begin(); 1017 Base != ClassDecl->bases_end(); ++Base) { 1018 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1019 // We found a direct base of this type. That's what we're 1020 // initializing. 1021 DirectBaseSpec = &*Base; 1022 break; 1023 } 1024 } 1025 1026 // Check for a virtual base class. 1027 // FIXME: We might be able to short-circuit this if we know in advance that 1028 // there are no virtual bases. 1029 VirtualBaseSpec = 0; 1030 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1031 // We haven't found a base yet; search the class hierarchy for a 1032 // virtual base class. 1033 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1034 /*DetectVirtual=*/false); 1035 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1036 BaseType, Paths)) { 1037 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1038 Path != Paths.end(); ++Path) { 1039 if (Path->back().Base->isVirtual()) { 1040 VirtualBaseSpec = Path->back().Base; 1041 break; 1042 } 1043 } 1044 } 1045 } 1046 1047 return DirectBaseSpec || VirtualBaseSpec; 1048} 1049 1050/// ActOnMemInitializer - Handle a C++ member initializer. 1051MemInitResult 1052Sema::ActOnMemInitializer(Decl *ConstructorD, 1053 Scope *S, 1054 CXXScopeSpec &SS, 1055 IdentifierInfo *MemberOrBase, 1056 ParsedType TemplateTypeTy, 1057 SourceLocation IdLoc, 1058 SourceLocation LParenLoc, 1059 ExprTy **Args, unsigned NumArgs, 1060 SourceLocation RParenLoc) { 1061 if (!ConstructorD) 1062 return true; 1063 1064 AdjustDeclIfTemplate(ConstructorD); 1065 1066 CXXConstructorDecl *Constructor 1067 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1068 if (!Constructor) { 1069 // The user wrote a constructor initializer on a function that is 1070 // not a C++ constructor. Ignore the error for now, because we may 1071 // have more member initializers coming; we'll diagnose it just 1072 // once in ActOnMemInitializers. 1073 return true; 1074 } 1075 1076 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1077 1078 // C++ [class.base.init]p2: 1079 // Names in a mem-initializer-id are looked up in the scope of the 1080 // constructor's class and, if not found in that scope, are looked 1081 // up in the scope containing the constructor's definition. 1082 // [Note: if the constructor's class contains a member with the 1083 // same name as a direct or virtual base class of the class, a 1084 // mem-initializer-id naming the member or base class and composed 1085 // of a single identifier refers to the class member. A 1086 // mem-initializer-id for the hidden base class may be specified 1087 // using a qualified name. ] 1088 if (!SS.getScopeRep() && !TemplateTypeTy) { 1089 // Look for a member, first. 1090 FieldDecl *Member = 0; 1091 DeclContext::lookup_result Result 1092 = ClassDecl->lookup(MemberOrBase); 1093 if (Result.first != Result.second) { 1094 Member = dyn_cast<FieldDecl>(*Result.first); 1095 1096 if (Member) 1097 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1098 LParenLoc, RParenLoc); 1099 // Handle anonymous union case. 1100 if (IndirectFieldDecl* IndirectField 1101 = dyn_cast<IndirectFieldDecl>(*Result.first)) 1102 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1103 NumArgs, IdLoc, 1104 LParenLoc, RParenLoc); 1105 } 1106 } 1107 // It didn't name a member, so see if it names a class. 1108 QualType BaseType; 1109 TypeSourceInfo *TInfo = 0; 1110 1111 if (TemplateTypeTy) { 1112 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1113 } else { 1114 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1115 LookupParsedName(R, S, &SS); 1116 1117 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1118 if (!TyD) { 1119 if (R.isAmbiguous()) return true; 1120 1121 // We don't want access-control diagnostics here. 1122 R.suppressDiagnostics(); 1123 1124 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1125 bool NotUnknownSpecialization = false; 1126 DeclContext *DC = computeDeclContext(SS, false); 1127 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1128 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1129 1130 if (!NotUnknownSpecialization) { 1131 // When the scope specifier can refer to a member of an unknown 1132 // specialization, we take it as a type name. 1133 BaseType = CheckTypenameType(ETK_None, 1134 (NestedNameSpecifier *)SS.getScopeRep(), 1135 *MemberOrBase, SourceLocation(), 1136 SS.getRange(), IdLoc); 1137 if (BaseType.isNull()) 1138 return true; 1139 1140 R.clear(); 1141 R.setLookupName(MemberOrBase); 1142 } 1143 } 1144 1145 // If no results were found, try to correct typos. 1146 if (R.empty() && BaseType.isNull() && 1147 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1148 R.isSingleResult()) { 1149 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1150 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1151 // We have found a non-static data member with a similar 1152 // name to what was typed; complain and initialize that 1153 // member. 1154 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1155 << MemberOrBase << true << R.getLookupName() 1156 << FixItHint::CreateReplacement(R.getNameLoc(), 1157 R.getLookupName().getAsString()); 1158 Diag(Member->getLocation(), diag::note_previous_decl) 1159 << Member->getDeclName(); 1160 1161 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1162 LParenLoc, RParenLoc); 1163 } 1164 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1165 const CXXBaseSpecifier *DirectBaseSpec; 1166 const CXXBaseSpecifier *VirtualBaseSpec; 1167 if (FindBaseInitializer(*this, ClassDecl, 1168 Context.getTypeDeclType(Type), 1169 DirectBaseSpec, VirtualBaseSpec)) { 1170 // We have found a direct or virtual base class with a 1171 // similar name to what was typed; complain and initialize 1172 // that base class. 1173 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1174 << MemberOrBase << false << R.getLookupName() 1175 << FixItHint::CreateReplacement(R.getNameLoc(), 1176 R.getLookupName().getAsString()); 1177 1178 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1179 : VirtualBaseSpec; 1180 Diag(BaseSpec->getSourceRange().getBegin(), 1181 diag::note_base_class_specified_here) 1182 << BaseSpec->getType() 1183 << BaseSpec->getSourceRange(); 1184 1185 TyD = Type; 1186 } 1187 } 1188 } 1189 1190 if (!TyD && BaseType.isNull()) { 1191 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1192 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1193 return true; 1194 } 1195 } 1196 1197 if (BaseType.isNull()) { 1198 BaseType = Context.getTypeDeclType(TyD); 1199 if (SS.isSet()) { 1200 NestedNameSpecifier *Qualifier = 1201 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1202 1203 // FIXME: preserve source range information 1204 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1205 } 1206 } 1207 } 1208 1209 if (!TInfo) 1210 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1211 1212 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1213 LParenLoc, RParenLoc, ClassDecl); 1214} 1215 1216/// Checks an initializer expression for use of uninitialized fields, such as 1217/// containing the field that is being initialized. Returns true if there is an 1218/// uninitialized field was used an updates the SourceLocation parameter; false 1219/// otherwise. 1220static bool InitExprContainsUninitializedFields(const Stmt *S, 1221 const ValueDecl *LhsField, 1222 SourceLocation *L) { 1223 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1224 1225 if (isa<CallExpr>(S)) { 1226 // Do not descend into function calls or constructors, as the use 1227 // of an uninitialized field may be valid. One would have to inspect 1228 // the contents of the function/ctor to determine if it is safe or not. 1229 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1230 // may be safe, depending on what the function/ctor does. 1231 return false; 1232 } 1233 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1234 const NamedDecl *RhsField = ME->getMemberDecl(); 1235 1236 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1237 // The member expression points to a static data member. 1238 assert(VD->isStaticDataMember() && 1239 "Member points to non-static data member!"); 1240 (void)VD; 1241 return false; 1242 } 1243 1244 if (isa<EnumConstantDecl>(RhsField)) { 1245 // The member expression points to an enum. 1246 return false; 1247 } 1248 1249 if (RhsField == LhsField) { 1250 // Initializing a field with itself. Throw a warning. 1251 // But wait; there are exceptions! 1252 // Exception #1: The field may not belong to this record. 1253 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1254 const Expr *base = ME->getBase(); 1255 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1256 // Even though the field matches, it does not belong to this record. 1257 return false; 1258 } 1259 // None of the exceptions triggered; return true to indicate an 1260 // uninitialized field was used. 1261 *L = ME->getMemberLoc(); 1262 return true; 1263 } 1264 } else if (isa<SizeOfAlignOfExpr>(S)) { 1265 // sizeof/alignof doesn't reference contents, do not warn. 1266 return false; 1267 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1268 // address-of doesn't reference contents (the pointer may be dereferenced 1269 // in the same expression but it would be rare; and weird). 1270 if (UOE->getOpcode() == UO_AddrOf) 1271 return false; 1272 } 1273 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1274 it != e; ++it) { 1275 if (!*it) { 1276 // An expression such as 'member(arg ?: "")' may trigger this. 1277 continue; 1278 } 1279 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1280 return true; 1281 } 1282 return false; 1283} 1284 1285MemInitResult 1286Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1287 unsigned NumArgs, SourceLocation IdLoc, 1288 SourceLocation LParenLoc, 1289 SourceLocation RParenLoc) { 1290 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1291 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1292 assert((DirectMember || IndirectMember) && 1293 "Member must be a FieldDecl or IndirectFieldDecl"); 1294 1295 if (Member->isInvalidDecl()) 1296 return true; 1297 1298 // Diagnose value-uses of fields to initialize themselves, e.g. 1299 // foo(foo) 1300 // where foo is not also a parameter to the constructor. 1301 // TODO: implement -Wuninitialized and fold this into that framework. 1302 for (unsigned i = 0; i < NumArgs; ++i) { 1303 SourceLocation L; 1304 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1305 // FIXME: Return true in the case when other fields are used before being 1306 // uninitialized. For example, let this field be the i'th field. When 1307 // initializing the i'th field, throw a warning if any of the >= i'th 1308 // fields are used, as they are not yet initialized. 1309 // Right now we are only handling the case where the i'th field uses 1310 // itself in its initializer. 1311 Diag(L, diag::warn_field_is_uninit); 1312 } 1313 } 1314 1315 bool HasDependentArg = false; 1316 for (unsigned i = 0; i < NumArgs; i++) 1317 HasDependentArg |= Args[i]->isTypeDependent(); 1318 1319 Expr *Init; 1320 if (Member->getType()->isDependentType() || HasDependentArg) { 1321 // Can't check initialization for a member of dependent type or when 1322 // any of the arguments are type-dependent expressions. 1323 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1324 RParenLoc); 1325 1326 // Erase any temporaries within this evaluation context; we're not 1327 // going to track them in the AST, since we'll be rebuilding the 1328 // ASTs during template instantiation. 1329 ExprTemporaries.erase( 1330 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1331 ExprTemporaries.end()); 1332 } else { 1333 // Initialize the member. 1334 InitializedEntity MemberEntity = 1335 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1336 : InitializedEntity::InitializeMember(IndirectMember, 0); 1337 InitializationKind Kind = 1338 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1339 1340 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1341 1342 ExprResult MemberInit = 1343 InitSeq.Perform(*this, MemberEntity, Kind, 1344 MultiExprArg(*this, Args, NumArgs), 0); 1345 if (MemberInit.isInvalid()) 1346 return true; 1347 1348 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1349 1350 // C++0x [class.base.init]p7: 1351 // The initialization of each base and member constitutes a 1352 // full-expression. 1353 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1354 if (MemberInit.isInvalid()) 1355 return true; 1356 1357 // If we are in a dependent context, template instantiation will 1358 // perform this type-checking again. Just save the arguments that we 1359 // received in a ParenListExpr. 1360 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1361 // of the information that we have about the member 1362 // initializer. However, deconstructing the ASTs is a dicey process, 1363 // and this approach is far more likely to get the corner cases right. 1364 if (CurContext->isDependentContext()) 1365 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1366 RParenLoc); 1367 else 1368 Init = MemberInit.get(); 1369 } 1370 1371 if (DirectMember) { 1372 return new (Context) CXXBaseOrMemberInitializer(Context, DirectMember, 1373 IdLoc, LParenLoc, Init, 1374 RParenLoc); 1375 } else { 1376 return new (Context) CXXBaseOrMemberInitializer(Context, IndirectMember, 1377 IdLoc, LParenLoc, Init, 1378 RParenLoc); 1379 } 1380} 1381 1382MemInitResult 1383Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1384 Expr **Args, unsigned NumArgs, 1385 SourceLocation LParenLoc, SourceLocation RParenLoc, 1386 CXXRecordDecl *ClassDecl) { 1387 bool HasDependentArg = false; 1388 for (unsigned i = 0; i < NumArgs; i++) 1389 HasDependentArg |= Args[i]->isTypeDependent(); 1390 1391 SourceLocation BaseLoc 1392 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1393 1394 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1395 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1396 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1397 1398 // C++ [class.base.init]p2: 1399 // [...] Unless the mem-initializer-id names a nonstatic data 1400 // member of the constructor's class or a direct or virtual base 1401 // of that class, the mem-initializer is ill-formed. A 1402 // mem-initializer-list can initialize a base class using any 1403 // name that denotes that base class type. 1404 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1405 1406 // Check for direct and virtual base classes. 1407 const CXXBaseSpecifier *DirectBaseSpec = 0; 1408 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1409 if (!Dependent) { 1410 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1411 VirtualBaseSpec); 1412 1413 // C++ [base.class.init]p2: 1414 // Unless the mem-initializer-id names a nonstatic data member of the 1415 // constructor's class or a direct or virtual base of that class, the 1416 // mem-initializer is ill-formed. 1417 if (!DirectBaseSpec && !VirtualBaseSpec) { 1418 // If the class has any dependent bases, then it's possible that 1419 // one of those types will resolve to the same type as 1420 // BaseType. Therefore, just treat this as a dependent base 1421 // class initialization. FIXME: Should we try to check the 1422 // initialization anyway? It seems odd. 1423 if (ClassDecl->hasAnyDependentBases()) 1424 Dependent = true; 1425 else 1426 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1427 << BaseType << Context.getTypeDeclType(ClassDecl) 1428 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1429 } 1430 } 1431 1432 if (Dependent) { 1433 // Can't check initialization for a base of dependent type or when 1434 // any of the arguments are type-dependent expressions. 1435 ExprResult BaseInit 1436 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1437 RParenLoc)); 1438 1439 // Erase any temporaries within this evaluation context; we're not 1440 // going to track them in the AST, since we'll be rebuilding the 1441 // ASTs during template instantiation. 1442 ExprTemporaries.erase( 1443 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1444 ExprTemporaries.end()); 1445 1446 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1447 /*IsVirtual=*/false, 1448 LParenLoc, 1449 BaseInit.takeAs<Expr>(), 1450 RParenLoc); 1451 } 1452 1453 // C++ [base.class.init]p2: 1454 // If a mem-initializer-id is ambiguous because it designates both 1455 // a direct non-virtual base class and an inherited virtual base 1456 // class, the mem-initializer is ill-formed. 1457 if (DirectBaseSpec && VirtualBaseSpec) 1458 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1459 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1460 1461 CXXBaseSpecifier *BaseSpec 1462 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1463 if (!BaseSpec) 1464 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1465 1466 // Initialize the base. 1467 InitializedEntity BaseEntity = 1468 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1469 InitializationKind Kind = 1470 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1471 1472 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1473 1474 ExprResult BaseInit = 1475 InitSeq.Perform(*this, BaseEntity, Kind, 1476 MultiExprArg(*this, Args, NumArgs), 0); 1477 if (BaseInit.isInvalid()) 1478 return true; 1479 1480 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1481 1482 // C++0x [class.base.init]p7: 1483 // The initialization of each base and member constitutes a 1484 // full-expression. 1485 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1486 if (BaseInit.isInvalid()) 1487 return true; 1488 1489 // If we are in a dependent context, template instantiation will 1490 // perform this type-checking again. Just save the arguments that we 1491 // received in a ParenListExpr. 1492 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1493 // of the information that we have about the base 1494 // initializer. However, deconstructing the ASTs is a dicey process, 1495 // and this approach is far more likely to get the corner cases right. 1496 if (CurContext->isDependentContext()) { 1497 ExprResult Init 1498 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1499 RParenLoc)); 1500 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1501 BaseSpec->isVirtual(), 1502 LParenLoc, 1503 Init.takeAs<Expr>(), 1504 RParenLoc); 1505 } 1506 1507 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1508 BaseSpec->isVirtual(), 1509 LParenLoc, 1510 BaseInit.takeAs<Expr>(), 1511 RParenLoc); 1512} 1513 1514/// ImplicitInitializerKind - How an implicit base or member initializer should 1515/// initialize its base or member. 1516enum ImplicitInitializerKind { 1517 IIK_Default, 1518 IIK_Copy, 1519 IIK_Move 1520}; 1521 1522static bool 1523BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1524 ImplicitInitializerKind ImplicitInitKind, 1525 CXXBaseSpecifier *BaseSpec, 1526 bool IsInheritedVirtualBase, 1527 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1528 InitializedEntity InitEntity 1529 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1530 IsInheritedVirtualBase); 1531 1532 ExprResult BaseInit; 1533 1534 switch (ImplicitInitKind) { 1535 case IIK_Default: { 1536 InitializationKind InitKind 1537 = InitializationKind::CreateDefault(Constructor->getLocation()); 1538 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1539 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1540 MultiExprArg(SemaRef, 0, 0)); 1541 break; 1542 } 1543 1544 case IIK_Copy: { 1545 ParmVarDecl *Param = Constructor->getParamDecl(0); 1546 QualType ParamType = Param->getType().getNonReferenceType(); 1547 1548 Expr *CopyCtorArg = 1549 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1550 Constructor->getLocation(), ParamType, 1551 VK_LValue, 0); 1552 1553 // Cast to the base class to avoid ambiguities. 1554 QualType ArgTy = 1555 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1556 ParamType.getQualifiers()); 1557 1558 CXXCastPath BasePath; 1559 BasePath.push_back(BaseSpec); 1560 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1561 CK_UncheckedDerivedToBase, 1562 VK_LValue, &BasePath); 1563 1564 InitializationKind InitKind 1565 = InitializationKind::CreateDirect(Constructor->getLocation(), 1566 SourceLocation(), SourceLocation()); 1567 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1568 &CopyCtorArg, 1); 1569 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1570 MultiExprArg(&CopyCtorArg, 1)); 1571 break; 1572 } 1573 1574 case IIK_Move: 1575 assert(false && "Unhandled initializer kind!"); 1576 } 1577 1578 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1579 if (BaseInit.isInvalid()) 1580 return true; 1581 1582 CXXBaseInit = 1583 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1584 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1585 SourceLocation()), 1586 BaseSpec->isVirtual(), 1587 SourceLocation(), 1588 BaseInit.takeAs<Expr>(), 1589 SourceLocation()); 1590 1591 return false; 1592} 1593 1594static bool 1595BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1596 ImplicitInitializerKind ImplicitInitKind, 1597 FieldDecl *Field, 1598 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1599 if (Field->isInvalidDecl()) 1600 return true; 1601 1602 SourceLocation Loc = Constructor->getLocation(); 1603 1604 if (ImplicitInitKind == IIK_Copy) { 1605 ParmVarDecl *Param = Constructor->getParamDecl(0); 1606 QualType ParamType = Param->getType().getNonReferenceType(); 1607 1608 Expr *MemberExprBase = 1609 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1610 Loc, ParamType, VK_LValue, 0); 1611 1612 // Build a reference to this field within the parameter. 1613 CXXScopeSpec SS; 1614 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1615 Sema::LookupMemberName); 1616 MemberLookup.addDecl(Field, AS_public); 1617 MemberLookup.resolveKind(); 1618 ExprResult CopyCtorArg 1619 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1620 ParamType, Loc, 1621 /*IsArrow=*/false, 1622 SS, 1623 /*FirstQualifierInScope=*/0, 1624 MemberLookup, 1625 /*TemplateArgs=*/0); 1626 if (CopyCtorArg.isInvalid()) 1627 return true; 1628 1629 // When the field we are copying is an array, create index variables for 1630 // each dimension of the array. We use these index variables to subscript 1631 // the source array, and other clients (e.g., CodeGen) will perform the 1632 // necessary iteration with these index variables. 1633 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1634 QualType BaseType = Field->getType(); 1635 QualType SizeType = SemaRef.Context.getSizeType(); 1636 while (const ConstantArrayType *Array 1637 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1638 // Create the iteration variable for this array index. 1639 IdentifierInfo *IterationVarName = 0; 1640 { 1641 llvm::SmallString<8> Str; 1642 llvm::raw_svector_ostream OS(Str); 1643 OS << "__i" << IndexVariables.size(); 1644 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1645 } 1646 VarDecl *IterationVar 1647 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1648 IterationVarName, SizeType, 1649 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1650 SC_None, SC_None); 1651 IndexVariables.push_back(IterationVar); 1652 1653 // Create a reference to the iteration variable. 1654 ExprResult IterationVarRef 1655 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1656 assert(!IterationVarRef.isInvalid() && 1657 "Reference to invented variable cannot fail!"); 1658 1659 // Subscript the array with this iteration variable. 1660 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1661 Loc, 1662 IterationVarRef.take(), 1663 Loc); 1664 if (CopyCtorArg.isInvalid()) 1665 return true; 1666 1667 BaseType = Array->getElementType(); 1668 } 1669 1670 // Construct the entity that we will be initializing. For an array, this 1671 // will be first element in the array, which may require several levels 1672 // of array-subscript entities. 1673 llvm::SmallVector<InitializedEntity, 4> Entities; 1674 Entities.reserve(1 + IndexVariables.size()); 1675 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1676 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1677 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1678 0, 1679 Entities.back())); 1680 1681 // Direct-initialize to use the copy constructor. 1682 InitializationKind InitKind = 1683 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1684 1685 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1686 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1687 &CopyCtorArgE, 1); 1688 1689 ExprResult MemberInit 1690 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1691 MultiExprArg(&CopyCtorArgE, 1)); 1692 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1693 if (MemberInit.isInvalid()) 1694 return true; 1695 1696 CXXMemberInit 1697 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1698 MemberInit.takeAs<Expr>(), Loc, 1699 IndexVariables.data(), 1700 IndexVariables.size()); 1701 return false; 1702 } 1703 1704 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1705 1706 QualType FieldBaseElementType = 1707 SemaRef.Context.getBaseElementType(Field->getType()); 1708 1709 if (FieldBaseElementType->isRecordType()) { 1710 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1711 InitializationKind InitKind = 1712 InitializationKind::CreateDefault(Loc); 1713 1714 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1715 ExprResult MemberInit = 1716 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1717 1718 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1719 if (MemberInit.isInvalid()) 1720 return true; 1721 1722 CXXMemberInit = 1723 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1724 Field, Loc, Loc, 1725 MemberInit.get(), 1726 Loc); 1727 return false; 1728 } 1729 1730 if (FieldBaseElementType->isReferenceType()) { 1731 SemaRef.Diag(Constructor->getLocation(), 1732 diag::err_uninitialized_member_in_ctor) 1733 << (int)Constructor->isImplicit() 1734 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1735 << 0 << Field->getDeclName(); 1736 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1737 return true; 1738 } 1739 1740 if (FieldBaseElementType.isConstQualified()) { 1741 SemaRef.Diag(Constructor->getLocation(), 1742 diag::err_uninitialized_member_in_ctor) 1743 << (int)Constructor->isImplicit() 1744 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1745 << 1 << Field->getDeclName(); 1746 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1747 return true; 1748 } 1749 1750 // Nothing to initialize. 1751 CXXMemberInit = 0; 1752 return false; 1753} 1754 1755namespace { 1756struct BaseAndFieldInfo { 1757 Sema &S; 1758 CXXConstructorDecl *Ctor; 1759 bool AnyErrorsInInits; 1760 ImplicitInitializerKind IIK; 1761 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1762 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1763 1764 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1765 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1766 // FIXME: Handle implicit move constructors. 1767 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1768 IIK = IIK_Copy; 1769 else 1770 IIK = IIK_Default; 1771 } 1772}; 1773} 1774 1775static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1776 FieldDecl *Top, FieldDecl *Field) { 1777 1778 // Overwhelmingly common case: we have a direct initializer for this field. 1779 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1780 Info.AllToInit.push_back(Init); 1781 return false; 1782 } 1783 1784 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1785 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1786 assert(FieldClassType && "anonymous struct/union without record type"); 1787 CXXRecordDecl *FieldClassDecl 1788 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1789 1790 // Even though union members never have non-trivial default 1791 // constructions in C++03, we still build member initializers for aggregate 1792 // record types which can be union members, and C++0x allows non-trivial 1793 // default constructors for union members, so we ensure that only one 1794 // member is initialized for these. 1795 if (FieldClassDecl->isUnion()) { 1796 // First check for an explicit initializer for one field. 1797 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1798 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1799 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1800 Info.AllToInit.push_back(Init); 1801 1802 // Once we've initialized a field of an anonymous union, the union 1803 // field in the class is also initialized, so exit immediately. 1804 return false; 1805 } else if ((*FA)->isAnonymousStructOrUnion()) { 1806 if (CollectFieldInitializer(Info, Top, *FA)) 1807 return true; 1808 } 1809 } 1810 1811 // Fallthrough and construct a default initializer for the union as 1812 // a whole, which can call its default constructor if such a thing exists 1813 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1814 // behavior going forward with C++0x, when anonymous unions there are 1815 // finalized, we should revisit this. 1816 } else { 1817 // For structs, we simply descend through to initialize all members where 1818 // necessary. 1819 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1820 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1821 if (CollectFieldInitializer(Info, Top, *FA)) 1822 return true; 1823 } 1824 } 1825 } 1826 1827 // Don't try to build an implicit initializer if there were semantic 1828 // errors in any of the initializers (and therefore we might be 1829 // missing some that the user actually wrote). 1830 if (Info.AnyErrorsInInits) 1831 return false; 1832 1833 CXXBaseOrMemberInitializer *Init = 0; 1834 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1835 return true; 1836 1837 if (Init) 1838 Info.AllToInit.push_back(Init); 1839 1840 return false; 1841} 1842 1843bool 1844Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1845 CXXBaseOrMemberInitializer **Initializers, 1846 unsigned NumInitializers, 1847 bool AnyErrors) { 1848 if (Constructor->getDeclContext()->isDependentContext()) { 1849 // Just store the initializers as written, they will be checked during 1850 // instantiation. 1851 if (NumInitializers > 0) { 1852 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1853 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1854 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1855 memcpy(baseOrMemberInitializers, Initializers, 1856 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1857 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1858 } 1859 1860 return false; 1861 } 1862 1863 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1864 1865 // We need to build the initializer AST according to order of construction 1866 // and not what user specified in the Initializers list. 1867 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1868 if (!ClassDecl) 1869 return true; 1870 1871 bool HadError = false; 1872 1873 for (unsigned i = 0; i < NumInitializers; i++) { 1874 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1875 1876 if (Member->isBaseInitializer()) 1877 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1878 else 1879 Info.AllBaseFields[Member->getAnyMember()] = Member; 1880 } 1881 1882 // Keep track of the direct virtual bases. 1883 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1884 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1885 E = ClassDecl->bases_end(); I != E; ++I) { 1886 if (I->isVirtual()) 1887 DirectVBases.insert(I); 1888 } 1889 1890 // Push virtual bases before others. 1891 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1892 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1893 1894 if (CXXBaseOrMemberInitializer *Value 1895 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1896 Info.AllToInit.push_back(Value); 1897 } else if (!AnyErrors) { 1898 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1899 CXXBaseOrMemberInitializer *CXXBaseInit; 1900 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1901 VBase, IsInheritedVirtualBase, 1902 CXXBaseInit)) { 1903 HadError = true; 1904 continue; 1905 } 1906 1907 Info.AllToInit.push_back(CXXBaseInit); 1908 } 1909 } 1910 1911 // Non-virtual bases. 1912 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1913 E = ClassDecl->bases_end(); Base != E; ++Base) { 1914 // Virtuals are in the virtual base list and already constructed. 1915 if (Base->isVirtual()) 1916 continue; 1917 1918 if (CXXBaseOrMemberInitializer *Value 1919 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1920 Info.AllToInit.push_back(Value); 1921 } else if (!AnyErrors) { 1922 CXXBaseOrMemberInitializer *CXXBaseInit; 1923 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1924 Base, /*IsInheritedVirtualBase=*/false, 1925 CXXBaseInit)) { 1926 HadError = true; 1927 continue; 1928 } 1929 1930 Info.AllToInit.push_back(CXXBaseInit); 1931 } 1932 } 1933 1934 // Fields. 1935 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1936 E = ClassDecl->field_end(); Field != E; ++Field) { 1937 if ((*Field)->getType()->isIncompleteArrayType()) { 1938 assert(ClassDecl->hasFlexibleArrayMember() && 1939 "Incomplete array type is not valid"); 1940 continue; 1941 } 1942 if (CollectFieldInitializer(Info, *Field, *Field)) 1943 HadError = true; 1944 } 1945 1946 NumInitializers = Info.AllToInit.size(); 1947 if (NumInitializers > 0) { 1948 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1949 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1950 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1951 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1952 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1953 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1954 1955 // Constructors implicitly reference the base and member 1956 // destructors. 1957 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1958 Constructor->getParent()); 1959 } 1960 1961 return HadError; 1962} 1963 1964static void *GetKeyForTopLevelField(FieldDecl *Field) { 1965 // For anonymous unions, use the class declaration as the key. 1966 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1967 if (RT->getDecl()->isAnonymousStructOrUnion()) 1968 return static_cast<void *>(RT->getDecl()); 1969 } 1970 return static_cast<void *>(Field); 1971} 1972 1973static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1974 return Context.getCanonicalType(BaseType).getTypePtr(); 1975} 1976 1977static void *GetKeyForMember(ASTContext &Context, 1978 CXXBaseOrMemberInitializer *Member) { 1979 if (!Member->isAnyMemberInitializer()) 1980 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1981 1982 // For fields injected into the class via declaration of an anonymous union, 1983 // use its anonymous union class declaration as the unique key. 1984 FieldDecl *Field = Member->getAnyMember(); 1985 1986 // If the field is a member of an anonymous struct or union, our key 1987 // is the anonymous record decl that's a direct child of the class. 1988 RecordDecl *RD = Field->getParent(); 1989 if (RD->isAnonymousStructOrUnion()) { 1990 while (true) { 1991 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1992 if (Parent->isAnonymousStructOrUnion()) 1993 RD = Parent; 1994 else 1995 break; 1996 } 1997 1998 return static_cast<void *>(RD); 1999 } 2000 2001 return static_cast<void *>(Field); 2002} 2003 2004static void 2005DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2006 const CXXConstructorDecl *Constructor, 2007 CXXBaseOrMemberInitializer **Inits, 2008 unsigned NumInits) { 2009 if (Constructor->getDeclContext()->isDependentContext()) 2010 return; 2011 2012 // Don't check initializers order unless the warning is enabled at the 2013 // location of at least one initializer. 2014 bool ShouldCheckOrder = false; 2015 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2016 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2017 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2018 Init->getSourceLocation()) 2019 != Diagnostic::Ignored) { 2020 ShouldCheckOrder = true; 2021 break; 2022 } 2023 } 2024 if (!ShouldCheckOrder) 2025 return; 2026 2027 // Build the list of bases and members in the order that they'll 2028 // actually be initialized. The explicit initializers should be in 2029 // this same order but may be missing things. 2030 llvm::SmallVector<const void*, 32> IdealInitKeys; 2031 2032 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2033 2034 // 1. Virtual bases. 2035 for (CXXRecordDecl::base_class_const_iterator VBase = 2036 ClassDecl->vbases_begin(), 2037 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2038 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2039 2040 // 2. Non-virtual bases. 2041 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2042 E = ClassDecl->bases_end(); Base != E; ++Base) { 2043 if (Base->isVirtual()) 2044 continue; 2045 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2046 } 2047 2048 // 3. Direct fields. 2049 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2050 E = ClassDecl->field_end(); Field != E; ++Field) 2051 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2052 2053 unsigned NumIdealInits = IdealInitKeys.size(); 2054 unsigned IdealIndex = 0; 2055 2056 CXXBaseOrMemberInitializer *PrevInit = 0; 2057 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2058 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2059 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2060 2061 // Scan forward to try to find this initializer in the idealized 2062 // initializers list. 2063 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2064 if (InitKey == IdealInitKeys[IdealIndex]) 2065 break; 2066 2067 // If we didn't find this initializer, it must be because we 2068 // scanned past it on a previous iteration. That can only 2069 // happen if we're out of order; emit a warning. 2070 if (IdealIndex == NumIdealInits && PrevInit) { 2071 Sema::SemaDiagnosticBuilder D = 2072 SemaRef.Diag(PrevInit->getSourceLocation(), 2073 diag::warn_initializer_out_of_order); 2074 2075 if (PrevInit->isAnyMemberInitializer()) 2076 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2077 else 2078 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2079 2080 if (Init->isAnyMemberInitializer()) 2081 D << 0 << Init->getAnyMember()->getDeclName(); 2082 else 2083 D << 1 << Init->getBaseClassInfo()->getType(); 2084 2085 // Move back to the initializer's location in the ideal list. 2086 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2087 if (InitKey == IdealInitKeys[IdealIndex]) 2088 break; 2089 2090 assert(IdealIndex != NumIdealInits && 2091 "initializer not found in initializer list"); 2092 } 2093 2094 PrevInit = Init; 2095 } 2096} 2097 2098namespace { 2099bool CheckRedundantInit(Sema &S, 2100 CXXBaseOrMemberInitializer *Init, 2101 CXXBaseOrMemberInitializer *&PrevInit) { 2102 if (!PrevInit) { 2103 PrevInit = Init; 2104 return false; 2105 } 2106 2107 if (FieldDecl *Field = Init->getMember()) 2108 S.Diag(Init->getSourceLocation(), 2109 diag::err_multiple_mem_initialization) 2110 << Field->getDeclName() 2111 << Init->getSourceRange(); 2112 else { 2113 Type *BaseClass = Init->getBaseClass(); 2114 assert(BaseClass && "neither field nor base"); 2115 S.Diag(Init->getSourceLocation(), 2116 diag::err_multiple_base_initialization) 2117 << QualType(BaseClass, 0) 2118 << Init->getSourceRange(); 2119 } 2120 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2121 << 0 << PrevInit->getSourceRange(); 2122 2123 return true; 2124} 2125 2126typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2127typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2128 2129bool CheckRedundantUnionInit(Sema &S, 2130 CXXBaseOrMemberInitializer *Init, 2131 RedundantUnionMap &Unions) { 2132 FieldDecl *Field = Init->getAnyMember(); 2133 RecordDecl *Parent = Field->getParent(); 2134 if (!Parent->isAnonymousStructOrUnion()) 2135 return false; 2136 2137 NamedDecl *Child = Field; 2138 do { 2139 if (Parent->isUnion()) { 2140 UnionEntry &En = Unions[Parent]; 2141 if (En.first && En.first != Child) { 2142 S.Diag(Init->getSourceLocation(), 2143 diag::err_multiple_mem_union_initialization) 2144 << Field->getDeclName() 2145 << Init->getSourceRange(); 2146 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2147 << 0 << En.second->getSourceRange(); 2148 return true; 2149 } else if (!En.first) { 2150 En.first = Child; 2151 En.second = Init; 2152 } 2153 } 2154 2155 Child = Parent; 2156 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2157 } while (Parent->isAnonymousStructOrUnion()); 2158 2159 return false; 2160} 2161} 2162 2163/// ActOnMemInitializers - Handle the member initializers for a constructor. 2164void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2165 SourceLocation ColonLoc, 2166 MemInitTy **meminits, unsigned NumMemInits, 2167 bool AnyErrors) { 2168 if (!ConstructorDecl) 2169 return; 2170 2171 AdjustDeclIfTemplate(ConstructorDecl); 2172 2173 CXXConstructorDecl *Constructor 2174 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2175 2176 if (!Constructor) { 2177 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2178 return; 2179 } 2180 2181 CXXBaseOrMemberInitializer **MemInits = 2182 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2183 2184 // Mapping for the duplicate initializers check. 2185 // For member initializers, this is keyed with a FieldDecl*. 2186 // For base initializers, this is keyed with a Type*. 2187 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2188 2189 // Mapping for the inconsistent anonymous-union initializers check. 2190 RedundantUnionMap MemberUnions; 2191 2192 bool HadError = false; 2193 for (unsigned i = 0; i < NumMemInits; i++) { 2194 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2195 2196 // Set the source order index. 2197 Init->setSourceOrder(i); 2198 2199 if (Init->isAnyMemberInitializer()) { 2200 FieldDecl *Field = Init->getAnyMember(); 2201 if (CheckRedundantInit(*this, Init, Members[Field]) || 2202 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2203 HadError = true; 2204 } else { 2205 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2206 if (CheckRedundantInit(*this, Init, Members[Key])) 2207 HadError = true; 2208 } 2209 } 2210 2211 if (HadError) 2212 return; 2213 2214 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2215 2216 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2217} 2218 2219void 2220Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2221 CXXRecordDecl *ClassDecl) { 2222 // Ignore dependent contexts. 2223 if (ClassDecl->isDependentContext()) 2224 return; 2225 2226 // FIXME: all the access-control diagnostics are positioned on the 2227 // field/base declaration. That's probably good; that said, the 2228 // user might reasonably want to know why the destructor is being 2229 // emitted, and we currently don't say. 2230 2231 // Non-static data members. 2232 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2233 E = ClassDecl->field_end(); I != E; ++I) { 2234 FieldDecl *Field = *I; 2235 if (Field->isInvalidDecl()) 2236 continue; 2237 QualType FieldType = Context.getBaseElementType(Field->getType()); 2238 2239 const RecordType* RT = FieldType->getAs<RecordType>(); 2240 if (!RT) 2241 continue; 2242 2243 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2244 if (FieldClassDecl->hasTrivialDestructor()) 2245 continue; 2246 2247 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2248 CheckDestructorAccess(Field->getLocation(), Dtor, 2249 PDiag(diag::err_access_dtor_field) 2250 << Field->getDeclName() 2251 << FieldType); 2252 2253 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2254 } 2255 2256 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2257 2258 // Bases. 2259 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2260 E = ClassDecl->bases_end(); Base != E; ++Base) { 2261 // Bases are always records in a well-formed non-dependent class. 2262 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2263 2264 // Remember direct virtual bases. 2265 if (Base->isVirtual()) 2266 DirectVirtualBases.insert(RT); 2267 2268 // Ignore trivial destructors. 2269 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2270 if (BaseClassDecl->hasTrivialDestructor()) 2271 continue; 2272 2273 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2274 2275 // FIXME: caret should be on the start of the class name 2276 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2277 PDiag(diag::err_access_dtor_base) 2278 << Base->getType() 2279 << Base->getSourceRange()); 2280 2281 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2282 } 2283 2284 // Virtual bases. 2285 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2286 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2287 2288 // Bases are always records in a well-formed non-dependent class. 2289 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2290 2291 // Ignore direct virtual bases. 2292 if (DirectVirtualBases.count(RT)) 2293 continue; 2294 2295 // Ignore trivial destructors. 2296 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2297 if (BaseClassDecl->hasTrivialDestructor()) 2298 continue; 2299 2300 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2301 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2302 PDiag(diag::err_access_dtor_vbase) 2303 << VBase->getType()); 2304 2305 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2306 } 2307} 2308 2309void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2310 if (!CDtorDecl) 2311 return; 2312 2313 if (CXXConstructorDecl *Constructor 2314 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2315 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2316} 2317 2318bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2319 unsigned DiagID, AbstractDiagSelID SelID) { 2320 if (SelID == -1) 2321 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2322 else 2323 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2324} 2325 2326bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2327 const PartialDiagnostic &PD) { 2328 if (!getLangOptions().CPlusPlus) 2329 return false; 2330 2331 if (const ArrayType *AT = Context.getAsArrayType(T)) 2332 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2333 2334 if (const PointerType *PT = T->getAs<PointerType>()) { 2335 // Find the innermost pointer type. 2336 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2337 PT = T; 2338 2339 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2340 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2341 } 2342 2343 const RecordType *RT = T->getAs<RecordType>(); 2344 if (!RT) 2345 return false; 2346 2347 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2348 2349 // We can't answer whether something is abstract until it has a 2350 // definition. If it's currently being defined, we'll walk back 2351 // over all the declarations when we have a full definition. 2352 const CXXRecordDecl *Def = RD->getDefinition(); 2353 if (!Def || Def->isBeingDefined()) 2354 return false; 2355 2356 if (!RD->isAbstract()) 2357 return false; 2358 2359 Diag(Loc, PD) << RD->getDeclName(); 2360 DiagnoseAbstractType(RD); 2361 2362 return true; 2363} 2364 2365void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2366 // Check if we've already emitted the list of pure virtual functions 2367 // for this class. 2368 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2369 return; 2370 2371 CXXFinalOverriderMap FinalOverriders; 2372 RD->getFinalOverriders(FinalOverriders); 2373 2374 // Keep a set of seen pure methods so we won't diagnose the same method 2375 // more than once. 2376 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2377 2378 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2379 MEnd = FinalOverriders.end(); 2380 M != MEnd; 2381 ++M) { 2382 for (OverridingMethods::iterator SO = M->second.begin(), 2383 SOEnd = M->second.end(); 2384 SO != SOEnd; ++SO) { 2385 // C++ [class.abstract]p4: 2386 // A class is abstract if it contains or inherits at least one 2387 // pure virtual function for which the final overrider is pure 2388 // virtual. 2389 2390 // 2391 if (SO->second.size() != 1) 2392 continue; 2393 2394 if (!SO->second.front().Method->isPure()) 2395 continue; 2396 2397 if (!SeenPureMethods.insert(SO->second.front().Method)) 2398 continue; 2399 2400 Diag(SO->second.front().Method->getLocation(), 2401 diag::note_pure_virtual_function) 2402 << SO->second.front().Method->getDeclName(); 2403 } 2404 } 2405 2406 if (!PureVirtualClassDiagSet) 2407 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2408 PureVirtualClassDiagSet->insert(RD); 2409} 2410 2411namespace { 2412struct AbstractUsageInfo { 2413 Sema &S; 2414 CXXRecordDecl *Record; 2415 CanQualType AbstractType; 2416 bool Invalid; 2417 2418 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2419 : S(S), Record(Record), 2420 AbstractType(S.Context.getCanonicalType( 2421 S.Context.getTypeDeclType(Record))), 2422 Invalid(false) {} 2423 2424 void DiagnoseAbstractType() { 2425 if (Invalid) return; 2426 S.DiagnoseAbstractType(Record); 2427 Invalid = true; 2428 } 2429 2430 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2431}; 2432 2433struct CheckAbstractUsage { 2434 AbstractUsageInfo &Info; 2435 const NamedDecl *Ctx; 2436 2437 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2438 : Info(Info), Ctx(Ctx) {} 2439 2440 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2441 switch (TL.getTypeLocClass()) { 2442#define ABSTRACT_TYPELOC(CLASS, PARENT) 2443#define TYPELOC(CLASS, PARENT) \ 2444 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2445#include "clang/AST/TypeLocNodes.def" 2446 } 2447 } 2448 2449 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2450 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2451 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2452 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2453 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2454 } 2455 } 2456 2457 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2458 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2459 } 2460 2461 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2462 // Visit the type parameters from a permissive context. 2463 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2464 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2465 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2466 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2467 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2468 // TODO: other template argument types? 2469 } 2470 } 2471 2472 // Visit pointee types from a permissive context. 2473#define CheckPolymorphic(Type) \ 2474 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2475 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2476 } 2477 CheckPolymorphic(PointerTypeLoc) 2478 CheckPolymorphic(ReferenceTypeLoc) 2479 CheckPolymorphic(MemberPointerTypeLoc) 2480 CheckPolymorphic(BlockPointerTypeLoc) 2481 2482 /// Handle all the types we haven't given a more specific 2483 /// implementation for above. 2484 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2485 // Every other kind of type that we haven't called out already 2486 // that has an inner type is either (1) sugar or (2) contains that 2487 // inner type in some way as a subobject. 2488 if (TypeLoc Next = TL.getNextTypeLoc()) 2489 return Visit(Next, Sel); 2490 2491 // If there's no inner type and we're in a permissive context, 2492 // don't diagnose. 2493 if (Sel == Sema::AbstractNone) return; 2494 2495 // Check whether the type matches the abstract type. 2496 QualType T = TL.getType(); 2497 if (T->isArrayType()) { 2498 Sel = Sema::AbstractArrayType; 2499 T = Info.S.Context.getBaseElementType(T); 2500 } 2501 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2502 if (CT != Info.AbstractType) return; 2503 2504 // It matched; do some magic. 2505 if (Sel == Sema::AbstractArrayType) { 2506 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2507 << T << TL.getSourceRange(); 2508 } else { 2509 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2510 << Sel << T << TL.getSourceRange(); 2511 } 2512 Info.DiagnoseAbstractType(); 2513 } 2514}; 2515 2516void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2517 Sema::AbstractDiagSelID Sel) { 2518 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2519} 2520 2521} 2522 2523/// Check for invalid uses of an abstract type in a method declaration. 2524static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2525 CXXMethodDecl *MD) { 2526 // No need to do the check on definitions, which require that 2527 // the return/param types be complete. 2528 if (MD->isThisDeclarationADefinition()) 2529 return; 2530 2531 // For safety's sake, just ignore it if we don't have type source 2532 // information. This should never happen for non-implicit methods, 2533 // but... 2534 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2535 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2536} 2537 2538/// Check for invalid uses of an abstract type within a class definition. 2539static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2540 CXXRecordDecl *RD) { 2541 for (CXXRecordDecl::decl_iterator 2542 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2543 Decl *D = *I; 2544 if (D->isImplicit()) continue; 2545 2546 // Methods and method templates. 2547 if (isa<CXXMethodDecl>(D)) { 2548 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2549 } else if (isa<FunctionTemplateDecl>(D)) { 2550 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2551 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2552 2553 // Fields and static variables. 2554 } else if (isa<FieldDecl>(D)) { 2555 FieldDecl *FD = cast<FieldDecl>(D); 2556 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2557 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2558 } else if (isa<VarDecl>(D)) { 2559 VarDecl *VD = cast<VarDecl>(D); 2560 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2561 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2562 2563 // Nested classes and class templates. 2564 } else if (isa<CXXRecordDecl>(D)) { 2565 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2566 } else if (isa<ClassTemplateDecl>(D)) { 2567 CheckAbstractClassUsage(Info, 2568 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2569 } 2570 } 2571} 2572 2573/// \brief Perform semantic checks on a class definition that has been 2574/// completing, introducing implicitly-declared members, checking for 2575/// abstract types, etc. 2576void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2577 if (!Record) 2578 return; 2579 2580 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2581 AbstractUsageInfo Info(*this, Record); 2582 CheckAbstractClassUsage(Info, Record); 2583 } 2584 2585 // If this is not an aggregate type and has no user-declared constructor, 2586 // complain about any non-static data members of reference or const scalar 2587 // type, since they will never get initializers. 2588 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2589 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2590 bool Complained = false; 2591 for (RecordDecl::field_iterator F = Record->field_begin(), 2592 FEnd = Record->field_end(); 2593 F != FEnd; ++F) { 2594 if (F->getType()->isReferenceType() || 2595 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2596 if (!Complained) { 2597 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2598 << Record->getTagKind() << Record; 2599 Complained = true; 2600 } 2601 2602 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2603 << F->getType()->isReferenceType() 2604 << F->getDeclName(); 2605 } 2606 } 2607 } 2608 2609 if (Record->isDynamicClass()) 2610 DynamicClasses.push_back(Record); 2611 2612 if (Record->getIdentifier()) { 2613 // C++ [class.mem]p13: 2614 // If T is the name of a class, then each of the following shall have a 2615 // name different from T: 2616 // - every member of every anonymous union that is a member of class T. 2617 // 2618 // C++ [class.mem]p14: 2619 // In addition, if class T has a user-declared constructor (12.1), every 2620 // non-static data member of class T shall have a name different from T. 2621 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2622 R.first != R.second; ++R.first) { 2623 NamedDecl *D = *R.first; 2624 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2625 isa<IndirectFieldDecl>(D)) { 2626 Diag(D->getLocation(), diag::err_member_name_of_class) 2627 << D->getDeclName(); 2628 break; 2629 } 2630 } 2631 } 2632} 2633 2634void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2635 Decl *TagDecl, 2636 SourceLocation LBrac, 2637 SourceLocation RBrac, 2638 AttributeList *AttrList) { 2639 if (!TagDecl) 2640 return; 2641 2642 AdjustDeclIfTemplate(TagDecl); 2643 2644 ActOnFields(S, RLoc, TagDecl, 2645 // strict aliasing violation! 2646 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2647 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2648 2649 CheckCompletedCXXClass( 2650 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2651} 2652 2653namespace { 2654 /// \brief Helper class that collects exception specifications for 2655 /// implicitly-declared special member functions. 2656 class ImplicitExceptionSpecification { 2657 ASTContext &Context; 2658 bool AllowsAllExceptions; 2659 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2660 llvm::SmallVector<QualType, 4> Exceptions; 2661 2662 public: 2663 explicit ImplicitExceptionSpecification(ASTContext &Context) 2664 : Context(Context), AllowsAllExceptions(false) { } 2665 2666 /// \brief Whether the special member function should have any 2667 /// exception specification at all. 2668 bool hasExceptionSpecification() const { 2669 return !AllowsAllExceptions; 2670 } 2671 2672 /// \brief Whether the special member function should have a 2673 /// throw(...) exception specification (a Microsoft extension). 2674 bool hasAnyExceptionSpecification() const { 2675 return false; 2676 } 2677 2678 /// \brief The number of exceptions in the exception specification. 2679 unsigned size() const { return Exceptions.size(); } 2680 2681 /// \brief The set of exceptions in the exception specification. 2682 const QualType *data() const { return Exceptions.data(); } 2683 2684 /// \brief Note that 2685 void CalledDecl(CXXMethodDecl *Method) { 2686 // If we already know that we allow all exceptions, do nothing. 2687 if (AllowsAllExceptions || !Method) 2688 return; 2689 2690 const FunctionProtoType *Proto 2691 = Method->getType()->getAs<FunctionProtoType>(); 2692 2693 // If this function can throw any exceptions, make a note of that. 2694 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2695 AllowsAllExceptions = true; 2696 ExceptionsSeen.clear(); 2697 Exceptions.clear(); 2698 return; 2699 } 2700 2701 // Record the exceptions in this function's exception specification. 2702 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2703 EEnd = Proto->exception_end(); 2704 E != EEnd; ++E) 2705 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2706 Exceptions.push_back(*E); 2707 } 2708 }; 2709} 2710 2711 2712/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2713/// special functions, such as the default constructor, copy 2714/// constructor, or destructor, to the given C++ class (C++ 2715/// [special]p1). This routine can only be executed just before the 2716/// definition of the class is complete. 2717void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2718 if (!ClassDecl->hasUserDeclaredConstructor()) 2719 ++ASTContext::NumImplicitDefaultConstructors; 2720 2721 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2722 ++ASTContext::NumImplicitCopyConstructors; 2723 2724 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2725 ++ASTContext::NumImplicitCopyAssignmentOperators; 2726 2727 // If we have a dynamic class, then the copy assignment operator may be 2728 // virtual, so we have to declare it immediately. This ensures that, e.g., 2729 // it shows up in the right place in the vtable and that we diagnose 2730 // problems with the implicit exception specification. 2731 if (ClassDecl->isDynamicClass()) 2732 DeclareImplicitCopyAssignment(ClassDecl); 2733 } 2734 2735 if (!ClassDecl->hasUserDeclaredDestructor()) { 2736 ++ASTContext::NumImplicitDestructors; 2737 2738 // If we have a dynamic class, then the destructor may be virtual, so we 2739 // have to declare the destructor immediately. This ensures that, e.g., it 2740 // shows up in the right place in the vtable and that we diagnose problems 2741 // with the implicit exception specification. 2742 if (ClassDecl->isDynamicClass()) 2743 DeclareImplicitDestructor(ClassDecl); 2744 } 2745} 2746 2747void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2748 if (!D) 2749 return; 2750 2751 TemplateParameterList *Params = 0; 2752 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2753 Params = Template->getTemplateParameters(); 2754 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2755 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2756 Params = PartialSpec->getTemplateParameters(); 2757 else 2758 return; 2759 2760 for (TemplateParameterList::iterator Param = Params->begin(), 2761 ParamEnd = Params->end(); 2762 Param != ParamEnd; ++Param) { 2763 NamedDecl *Named = cast<NamedDecl>(*Param); 2764 if (Named->getDeclName()) { 2765 S->AddDecl(Named); 2766 IdResolver.AddDecl(Named); 2767 } 2768 } 2769} 2770 2771void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2772 if (!RecordD) return; 2773 AdjustDeclIfTemplate(RecordD); 2774 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2775 PushDeclContext(S, Record); 2776} 2777 2778void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2779 if (!RecordD) return; 2780 PopDeclContext(); 2781} 2782 2783/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2784/// parsing a top-level (non-nested) C++ class, and we are now 2785/// parsing those parts of the given Method declaration that could 2786/// not be parsed earlier (C++ [class.mem]p2), such as default 2787/// arguments. This action should enter the scope of the given 2788/// Method declaration as if we had just parsed the qualified method 2789/// name. However, it should not bring the parameters into scope; 2790/// that will be performed by ActOnDelayedCXXMethodParameter. 2791void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2792} 2793 2794/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2795/// C++ method declaration. We're (re-)introducing the given 2796/// function parameter into scope for use in parsing later parts of 2797/// the method declaration. For example, we could see an 2798/// ActOnParamDefaultArgument event for this parameter. 2799void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2800 if (!ParamD) 2801 return; 2802 2803 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2804 2805 // If this parameter has an unparsed default argument, clear it out 2806 // to make way for the parsed default argument. 2807 if (Param->hasUnparsedDefaultArg()) 2808 Param->setDefaultArg(0); 2809 2810 S->AddDecl(Param); 2811 if (Param->getDeclName()) 2812 IdResolver.AddDecl(Param); 2813} 2814 2815/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2816/// processing the delayed method declaration for Method. The method 2817/// declaration is now considered finished. There may be a separate 2818/// ActOnStartOfFunctionDef action later (not necessarily 2819/// immediately!) for this method, if it was also defined inside the 2820/// class body. 2821void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2822 if (!MethodD) 2823 return; 2824 2825 AdjustDeclIfTemplate(MethodD); 2826 2827 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2828 2829 // Now that we have our default arguments, check the constructor 2830 // again. It could produce additional diagnostics or affect whether 2831 // the class has implicitly-declared destructors, among other 2832 // things. 2833 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2834 CheckConstructor(Constructor); 2835 2836 // Check the default arguments, which we may have added. 2837 if (!Method->isInvalidDecl()) 2838 CheckCXXDefaultArguments(Method); 2839} 2840 2841/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2842/// the well-formedness of the constructor declarator @p D with type @p 2843/// R. If there are any errors in the declarator, this routine will 2844/// emit diagnostics and set the invalid bit to true. In any case, the type 2845/// will be updated to reflect a well-formed type for the constructor and 2846/// returned. 2847QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2848 StorageClass &SC) { 2849 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2850 2851 // C++ [class.ctor]p3: 2852 // A constructor shall not be virtual (10.3) or static (9.4). A 2853 // constructor can be invoked for a const, volatile or const 2854 // volatile object. A constructor shall not be declared const, 2855 // volatile, or const volatile (9.3.2). 2856 if (isVirtual) { 2857 if (!D.isInvalidType()) 2858 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2859 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2860 << SourceRange(D.getIdentifierLoc()); 2861 D.setInvalidType(); 2862 } 2863 if (SC == SC_Static) { 2864 if (!D.isInvalidType()) 2865 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2866 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2867 << SourceRange(D.getIdentifierLoc()); 2868 D.setInvalidType(); 2869 SC = SC_None; 2870 } 2871 2872 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 2873 if (FTI.TypeQuals != 0) { 2874 if (FTI.TypeQuals & Qualifiers::Const) 2875 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2876 << "const" << SourceRange(D.getIdentifierLoc()); 2877 if (FTI.TypeQuals & Qualifiers::Volatile) 2878 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2879 << "volatile" << SourceRange(D.getIdentifierLoc()); 2880 if (FTI.TypeQuals & Qualifiers::Restrict) 2881 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2882 << "restrict" << SourceRange(D.getIdentifierLoc()); 2883 D.setInvalidType(); 2884 } 2885 2886 // Rebuild the function type "R" without any type qualifiers (in 2887 // case any of the errors above fired) and with "void" as the 2888 // return type, since constructors don't have return types. 2889 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2890 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 2891 return R; 2892 2893 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 2894 EPI.TypeQuals = 0; 2895 2896 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2897 Proto->getNumArgs(), EPI); 2898} 2899 2900/// CheckConstructor - Checks a fully-formed constructor for 2901/// well-formedness, issuing any diagnostics required. Returns true if 2902/// the constructor declarator is invalid. 2903void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2904 CXXRecordDecl *ClassDecl 2905 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2906 if (!ClassDecl) 2907 return Constructor->setInvalidDecl(); 2908 2909 // C++ [class.copy]p3: 2910 // A declaration of a constructor for a class X is ill-formed if 2911 // its first parameter is of type (optionally cv-qualified) X and 2912 // either there are no other parameters or else all other 2913 // parameters have default arguments. 2914 if (!Constructor->isInvalidDecl() && 2915 ((Constructor->getNumParams() == 1) || 2916 (Constructor->getNumParams() > 1 && 2917 Constructor->getParamDecl(1)->hasDefaultArg())) && 2918 Constructor->getTemplateSpecializationKind() 2919 != TSK_ImplicitInstantiation) { 2920 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2921 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2922 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2923 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2924 const char *ConstRef 2925 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2926 : " const &"; 2927 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2928 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2929 2930 // FIXME: Rather that making the constructor invalid, we should endeavor 2931 // to fix the type. 2932 Constructor->setInvalidDecl(); 2933 } 2934 } 2935} 2936 2937/// CheckDestructor - Checks a fully-formed destructor definition for 2938/// well-formedness, issuing any diagnostics required. Returns true 2939/// on error. 2940bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2941 CXXRecordDecl *RD = Destructor->getParent(); 2942 2943 if (Destructor->isVirtual()) { 2944 SourceLocation Loc; 2945 2946 if (!Destructor->isImplicit()) 2947 Loc = Destructor->getLocation(); 2948 else 2949 Loc = RD->getLocation(); 2950 2951 // If we have a virtual destructor, look up the deallocation function 2952 FunctionDecl *OperatorDelete = 0; 2953 DeclarationName Name = 2954 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2955 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2956 return true; 2957 2958 MarkDeclarationReferenced(Loc, OperatorDelete); 2959 2960 Destructor->setOperatorDelete(OperatorDelete); 2961 } 2962 2963 return false; 2964} 2965 2966static inline bool 2967FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2968 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2969 FTI.ArgInfo[0].Param && 2970 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 2971} 2972 2973/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2974/// the well-formednes of the destructor declarator @p D with type @p 2975/// R. If there are any errors in the declarator, this routine will 2976/// emit diagnostics and set the declarator to invalid. Even if this happens, 2977/// will be updated to reflect a well-formed type for the destructor and 2978/// returned. 2979QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2980 StorageClass& SC) { 2981 // C++ [class.dtor]p1: 2982 // [...] A typedef-name that names a class is a class-name 2983 // (7.1.3); however, a typedef-name that names a class shall not 2984 // be used as the identifier in the declarator for a destructor 2985 // declaration. 2986 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2987 if (isa<TypedefType>(DeclaratorType)) 2988 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2989 << DeclaratorType; 2990 2991 // C++ [class.dtor]p2: 2992 // A destructor is used to destroy objects of its class type. A 2993 // destructor takes no parameters, and no return type can be 2994 // specified for it (not even void). The address of a destructor 2995 // shall not be taken. A destructor shall not be static. A 2996 // destructor can be invoked for a const, volatile or const 2997 // volatile object. A destructor shall not be declared const, 2998 // volatile or const volatile (9.3.2). 2999 if (SC == SC_Static) { 3000 if (!D.isInvalidType()) 3001 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3002 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3003 << SourceRange(D.getIdentifierLoc()) 3004 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3005 3006 SC = SC_None; 3007 } 3008 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3009 // Destructors don't have return types, but the parser will 3010 // happily parse something like: 3011 // 3012 // class X { 3013 // float ~X(); 3014 // }; 3015 // 3016 // The return type will be eliminated later. 3017 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3018 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3019 << SourceRange(D.getIdentifierLoc()); 3020 } 3021 3022 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3023 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3024 if (FTI.TypeQuals & Qualifiers::Const) 3025 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3026 << "const" << SourceRange(D.getIdentifierLoc()); 3027 if (FTI.TypeQuals & Qualifiers::Volatile) 3028 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3029 << "volatile" << SourceRange(D.getIdentifierLoc()); 3030 if (FTI.TypeQuals & Qualifiers::Restrict) 3031 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3032 << "restrict" << SourceRange(D.getIdentifierLoc()); 3033 D.setInvalidType(); 3034 } 3035 3036 // Make sure we don't have any parameters. 3037 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3038 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3039 3040 // Delete the parameters. 3041 FTI.freeArgs(); 3042 D.setInvalidType(); 3043 } 3044 3045 // Make sure the destructor isn't variadic. 3046 if (FTI.isVariadic) { 3047 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3048 D.setInvalidType(); 3049 } 3050 3051 // Rebuild the function type "R" without any type qualifiers or 3052 // parameters (in case any of the errors above fired) and with 3053 // "void" as the return type, since destructors don't have return 3054 // types. 3055 if (!D.isInvalidType()) 3056 return R; 3057 3058 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3059 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3060 EPI.Variadic = false; 3061 EPI.TypeQuals = 0; 3062 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3063} 3064 3065/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3066/// well-formednes of the conversion function declarator @p D with 3067/// type @p R. If there are any errors in the declarator, this routine 3068/// will emit diagnostics and return true. Otherwise, it will return 3069/// false. Either way, the type @p R will be updated to reflect a 3070/// well-formed type for the conversion operator. 3071void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3072 StorageClass& SC) { 3073 // C++ [class.conv.fct]p1: 3074 // Neither parameter types nor return type can be specified. The 3075 // type of a conversion function (8.3.5) is "function taking no 3076 // parameter returning conversion-type-id." 3077 if (SC == SC_Static) { 3078 if (!D.isInvalidType()) 3079 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3080 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3081 << SourceRange(D.getIdentifierLoc()); 3082 D.setInvalidType(); 3083 SC = SC_None; 3084 } 3085 3086 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3087 3088 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3089 // Conversion functions don't have return types, but the parser will 3090 // happily parse something like: 3091 // 3092 // class X { 3093 // float operator bool(); 3094 // }; 3095 // 3096 // The return type will be changed later anyway. 3097 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3098 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3099 << SourceRange(D.getIdentifierLoc()); 3100 D.setInvalidType(); 3101 } 3102 3103 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3104 3105 // Make sure we don't have any parameters. 3106 if (Proto->getNumArgs() > 0) { 3107 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3108 3109 // Delete the parameters. 3110 D.getFunctionTypeInfo().freeArgs(); 3111 D.setInvalidType(); 3112 } else if (Proto->isVariadic()) { 3113 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3114 D.setInvalidType(); 3115 } 3116 3117 // Diagnose "&operator bool()" and other such nonsense. This 3118 // is actually a gcc extension which we don't support. 3119 if (Proto->getResultType() != ConvType) { 3120 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3121 << Proto->getResultType(); 3122 D.setInvalidType(); 3123 ConvType = Proto->getResultType(); 3124 } 3125 3126 // C++ [class.conv.fct]p4: 3127 // The conversion-type-id shall not represent a function type nor 3128 // an array type. 3129 if (ConvType->isArrayType()) { 3130 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3131 ConvType = Context.getPointerType(ConvType); 3132 D.setInvalidType(); 3133 } else if (ConvType->isFunctionType()) { 3134 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3135 ConvType = Context.getPointerType(ConvType); 3136 D.setInvalidType(); 3137 } 3138 3139 // Rebuild the function type "R" without any parameters (in case any 3140 // of the errors above fired) and with the conversion type as the 3141 // return type. 3142 if (D.isInvalidType()) 3143 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3144 3145 // C++0x explicit conversion operators. 3146 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3147 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3148 diag::warn_explicit_conversion_functions) 3149 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3150} 3151 3152/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3153/// the declaration of the given C++ conversion function. This routine 3154/// is responsible for recording the conversion function in the C++ 3155/// class, if possible. 3156Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3157 assert(Conversion && "Expected to receive a conversion function declaration"); 3158 3159 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3160 3161 // Make sure we aren't redeclaring the conversion function. 3162 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3163 3164 // C++ [class.conv.fct]p1: 3165 // [...] A conversion function is never used to convert a 3166 // (possibly cv-qualified) object to the (possibly cv-qualified) 3167 // same object type (or a reference to it), to a (possibly 3168 // cv-qualified) base class of that type (or a reference to it), 3169 // or to (possibly cv-qualified) void. 3170 // FIXME: Suppress this warning if the conversion function ends up being a 3171 // virtual function that overrides a virtual function in a base class. 3172 QualType ClassType 3173 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3174 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3175 ConvType = ConvTypeRef->getPointeeType(); 3176 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3177 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3178 /* Suppress diagnostics for instantiations. */; 3179 else if (ConvType->isRecordType()) { 3180 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3181 if (ConvType == ClassType) 3182 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3183 << ClassType; 3184 else if (IsDerivedFrom(ClassType, ConvType)) 3185 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3186 << ClassType << ConvType; 3187 } else if (ConvType->isVoidType()) { 3188 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3189 << ClassType << ConvType; 3190 } 3191 3192 if (FunctionTemplateDecl *ConversionTemplate 3193 = Conversion->getDescribedFunctionTemplate()) 3194 return ConversionTemplate; 3195 3196 return Conversion; 3197} 3198 3199//===----------------------------------------------------------------------===// 3200// Namespace Handling 3201//===----------------------------------------------------------------------===// 3202 3203 3204 3205/// ActOnStartNamespaceDef - This is called at the start of a namespace 3206/// definition. 3207Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3208 SourceLocation InlineLoc, 3209 SourceLocation IdentLoc, 3210 IdentifierInfo *II, 3211 SourceLocation LBrace, 3212 AttributeList *AttrList) { 3213 // anonymous namespace starts at its left brace 3214 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3215 (II ? IdentLoc : LBrace) , II); 3216 Namespc->setLBracLoc(LBrace); 3217 Namespc->setInline(InlineLoc.isValid()); 3218 3219 Scope *DeclRegionScope = NamespcScope->getParent(); 3220 3221 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3222 3223 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3224 PushNamespaceVisibilityAttr(Attr); 3225 3226 if (II) { 3227 // C++ [namespace.def]p2: 3228 // The identifier in an original-namespace-definition shall not 3229 // have been previously defined in the declarative region in 3230 // which the original-namespace-definition appears. The 3231 // identifier in an original-namespace-definition is the name of 3232 // the namespace. Subsequently in that declarative region, it is 3233 // treated as an original-namespace-name. 3234 // 3235 // Since namespace names are unique in their scope, and we don't 3236 // look through using directives, just 3237 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3238 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3239 3240 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3241 // This is an extended namespace definition. 3242 if (Namespc->isInline() != OrigNS->isInline()) { 3243 // inline-ness must match 3244 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3245 << Namespc->isInline(); 3246 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3247 Namespc->setInvalidDecl(); 3248 // Recover by ignoring the new namespace's inline status. 3249 Namespc->setInline(OrigNS->isInline()); 3250 } 3251 3252 // Attach this namespace decl to the chain of extended namespace 3253 // definitions. 3254 OrigNS->setNextNamespace(Namespc); 3255 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3256 3257 // Remove the previous declaration from the scope. 3258 if (DeclRegionScope->isDeclScope(OrigNS)) { 3259 IdResolver.RemoveDecl(OrigNS); 3260 DeclRegionScope->RemoveDecl(OrigNS); 3261 } 3262 } else if (PrevDecl) { 3263 // This is an invalid name redefinition. 3264 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3265 << Namespc->getDeclName(); 3266 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3267 Namespc->setInvalidDecl(); 3268 // Continue on to push Namespc as current DeclContext and return it. 3269 } else if (II->isStr("std") && 3270 CurContext->getRedeclContext()->isTranslationUnit()) { 3271 // This is the first "real" definition of the namespace "std", so update 3272 // our cache of the "std" namespace to point at this definition. 3273 if (NamespaceDecl *StdNS = getStdNamespace()) { 3274 // We had already defined a dummy namespace "std". Link this new 3275 // namespace definition to the dummy namespace "std". 3276 StdNS->setNextNamespace(Namespc); 3277 StdNS->setLocation(IdentLoc); 3278 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3279 } 3280 3281 // Make our StdNamespace cache point at the first real definition of the 3282 // "std" namespace. 3283 StdNamespace = Namespc; 3284 } 3285 3286 PushOnScopeChains(Namespc, DeclRegionScope); 3287 } else { 3288 // Anonymous namespaces. 3289 assert(Namespc->isAnonymousNamespace()); 3290 3291 // Link the anonymous namespace into its parent. 3292 NamespaceDecl *PrevDecl; 3293 DeclContext *Parent = CurContext->getRedeclContext(); 3294 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3295 PrevDecl = TU->getAnonymousNamespace(); 3296 TU->setAnonymousNamespace(Namespc); 3297 } else { 3298 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3299 PrevDecl = ND->getAnonymousNamespace(); 3300 ND->setAnonymousNamespace(Namespc); 3301 } 3302 3303 // Link the anonymous namespace with its previous declaration. 3304 if (PrevDecl) { 3305 assert(PrevDecl->isAnonymousNamespace()); 3306 assert(!PrevDecl->getNextNamespace()); 3307 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3308 PrevDecl->setNextNamespace(Namespc); 3309 3310 if (Namespc->isInline() != PrevDecl->isInline()) { 3311 // inline-ness must match 3312 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3313 << Namespc->isInline(); 3314 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3315 Namespc->setInvalidDecl(); 3316 // Recover by ignoring the new namespace's inline status. 3317 Namespc->setInline(PrevDecl->isInline()); 3318 } 3319 } 3320 3321 CurContext->addDecl(Namespc); 3322 3323 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3324 // behaves as if it were replaced by 3325 // namespace unique { /* empty body */ } 3326 // using namespace unique; 3327 // namespace unique { namespace-body } 3328 // where all occurrences of 'unique' in a translation unit are 3329 // replaced by the same identifier and this identifier differs 3330 // from all other identifiers in the entire program. 3331 3332 // We just create the namespace with an empty name and then add an 3333 // implicit using declaration, just like the standard suggests. 3334 // 3335 // CodeGen enforces the "universally unique" aspect by giving all 3336 // declarations semantically contained within an anonymous 3337 // namespace internal linkage. 3338 3339 if (!PrevDecl) { 3340 UsingDirectiveDecl* UD 3341 = UsingDirectiveDecl::Create(Context, CurContext, 3342 /* 'using' */ LBrace, 3343 /* 'namespace' */ SourceLocation(), 3344 /* qualifier */ SourceRange(), 3345 /* NNS */ NULL, 3346 /* identifier */ SourceLocation(), 3347 Namespc, 3348 /* Ancestor */ CurContext); 3349 UD->setImplicit(); 3350 CurContext->addDecl(UD); 3351 } 3352 } 3353 3354 // Although we could have an invalid decl (i.e. the namespace name is a 3355 // redefinition), push it as current DeclContext and try to continue parsing. 3356 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3357 // for the namespace has the declarations that showed up in that particular 3358 // namespace definition. 3359 PushDeclContext(NamespcScope, Namespc); 3360 return Namespc; 3361} 3362 3363/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3364/// is a namespace alias, returns the namespace it points to. 3365static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3366 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3367 return AD->getNamespace(); 3368 return dyn_cast_or_null<NamespaceDecl>(D); 3369} 3370 3371/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3372/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3373void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3374 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3375 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3376 Namespc->setRBracLoc(RBrace); 3377 PopDeclContext(); 3378 if (Namespc->hasAttr<VisibilityAttr>()) 3379 PopPragmaVisibility(); 3380} 3381 3382CXXRecordDecl *Sema::getStdBadAlloc() const { 3383 return cast_or_null<CXXRecordDecl>( 3384 StdBadAlloc.get(Context.getExternalSource())); 3385} 3386 3387NamespaceDecl *Sema::getStdNamespace() const { 3388 return cast_or_null<NamespaceDecl>( 3389 StdNamespace.get(Context.getExternalSource())); 3390} 3391 3392/// \brief Retrieve the special "std" namespace, which may require us to 3393/// implicitly define the namespace. 3394NamespaceDecl *Sema::getOrCreateStdNamespace() { 3395 if (!StdNamespace) { 3396 // The "std" namespace has not yet been defined, so build one implicitly. 3397 StdNamespace = NamespaceDecl::Create(Context, 3398 Context.getTranslationUnitDecl(), 3399 SourceLocation(), 3400 &PP.getIdentifierTable().get("std")); 3401 getStdNamespace()->setImplicit(true); 3402 } 3403 3404 return getStdNamespace(); 3405} 3406 3407Decl *Sema::ActOnUsingDirective(Scope *S, 3408 SourceLocation UsingLoc, 3409 SourceLocation NamespcLoc, 3410 CXXScopeSpec &SS, 3411 SourceLocation IdentLoc, 3412 IdentifierInfo *NamespcName, 3413 AttributeList *AttrList) { 3414 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3415 assert(NamespcName && "Invalid NamespcName."); 3416 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3417 3418 // This can only happen along a recovery path. 3419 while (S->getFlags() & Scope::TemplateParamScope) 3420 S = S->getParent(); 3421 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3422 3423 UsingDirectiveDecl *UDir = 0; 3424 NestedNameSpecifier *Qualifier = 0; 3425 if (SS.isSet()) 3426 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3427 3428 // Lookup namespace name. 3429 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3430 LookupParsedName(R, S, &SS); 3431 if (R.isAmbiguous()) 3432 return 0; 3433 3434 if (R.empty()) { 3435 // Allow "using namespace std;" or "using namespace ::std;" even if 3436 // "std" hasn't been defined yet, for GCC compatibility. 3437 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3438 NamespcName->isStr("std")) { 3439 Diag(IdentLoc, diag::ext_using_undefined_std); 3440 R.addDecl(getOrCreateStdNamespace()); 3441 R.resolveKind(); 3442 } 3443 // Otherwise, attempt typo correction. 3444 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3445 CTC_NoKeywords, 0)) { 3446 if (R.getAsSingle<NamespaceDecl>() || 3447 R.getAsSingle<NamespaceAliasDecl>()) { 3448 if (DeclContext *DC = computeDeclContext(SS, false)) 3449 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3450 << NamespcName << DC << Corrected << SS.getRange() 3451 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3452 else 3453 Diag(IdentLoc, diag::err_using_directive_suggest) 3454 << NamespcName << Corrected 3455 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3456 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3457 << Corrected; 3458 3459 NamespcName = Corrected.getAsIdentifierInfo(); 3460 } else { 3461 R.clear(); 3462 R.setLookupName(NamespcName); 3463 } 3464 } 3465 } 3466 3467 if (!R.empty()) { 3468 NamedDecl *Named = R.getFoundDecl(); 3469 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3470 && "expected namespace decl"); 3471 // C++ [namespace.udir]p1: 3472 // A using-directive specifies that the names in the nominated 3473 // namespace can be used in the scope in which the 3474 // using-directive appears after the using-directive. During 3475 // unqualified name lookup (3.4.1), the names appear as if they 3476 // were declared in the nearest enclosing namespace which 3477 // contains both the using-directive and the nominated 3478 // namespace. [Note: in this context, "contains" means "contains 3479 // directly or indirectly". ] 3480 3481 // Find enclosing context containing both using-directive and 3482 // nominated namespace. 3483 NamespaceDecl *NS = getNamespaceDecl(Named); 3484 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3485 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3486 CommonAncestor = CommonAncestor->getParent(); 3487 3488 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3489 SS.getRange(), 3490 (NestedNameSpecifier *)SS.getScopeRep(), 3491 IdentLoc, Named, CommonAncestor); 3492 PushUsingDirective(S, UDir); 3493 } else { 3494 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3495 } 3496 3497 // FIXME: We ignore attributes for now. 3498 return UDir; 3499} 3500 3501void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3502 // If scope has associated entity, then using directive is at namespace 3503 // or translation unit scope. We add UsingDirectiveDecls, into 3504 // it's lookup structure. 3505 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3506 Ctx->addDecl(UDir); 3507 else 3508 // Otherwise it is block-sope. using-directives will affect lookup 3509 // only to the end of scope. 3510 S->PushUsingDirective(UDir); 3511} 3512 3513 3514Decl *Sema::ActOnUsingDeclaration(Scope *S, 3515 AccessSpecifier AS, 3516 bool HasUsingKeyword, 3517 SourceLocation UsingLoc, 3518 CXXScopeSpec &SS, 3519 UnqualifiedId &Name, 3520 AttributeList *AttrList, 3521 bool IsTypeName, 3522 SourceLocation TypenameLoc) { 3523 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3524 3525 switch (Name.getKind()) { 3526 case UnqualifiedId::IK_Identifier: 3527 case UnqualifiedId::IK_OperatorFunctionId: 3528 case UnqualifiedId::IK_LiteralOperatorId: 3529 case UnqualifiedId::IK_ConversionFunctionId: 3530 break; 3531 3532 case UnqualifiedId::IK_ConstructorName: 3533 case UnqualifiedId::IK_ConstructorTemplateId: 3534 // C++0x inherited constructors. 3535 if (getLangOptions().CPlusPlus0x) break; 3536 3537 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3538 << SS.getRange(); 3539 return 0; 3540 3541 case UnqualifiedId::IK_DestructorName: 3542 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3543 << SS.getRange(); 3544 return 0; 3545 3546 case UnqualifiedId::IK_TemplateId: 3547 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3548 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3549 return 0; 3550 } 3551 3552 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3553 DeclarationName TargetName = TargetNameInfo.getName(); 3554 if (!TargetName) 3555 return 0; 3556 3557 // Warn about using declarations. 3558 // TODO: store that the declaration was written without 'using' and 3559 // talk about access decls instead of using decls in the 3560 // diagnostics. 3561 if (!HasUsingKeyword) { 3562 UsingLoc = Name.getSourceRange().getBegin(); 3563 3564 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3565 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3566 } 3567 3568 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3569 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3570 return 0; 3571 3572 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3573 TargetNameInfo, AttrList, 3574 /* IsInstantiation */ false, 3575 IsTypeName, TypenameLoc); 3576 if (UD) 3577 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3578 3579 return UD; 3580} 3581 3582/// \brief Determine whether a using declaration considers the given 3583/// declarations as "equivalent", e.g., if they are redeclarations of 3584/// the same entity or are both typedefs of the same type. 3585static bool 3586IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3587 bool &SuppressRedeclaration) { 3588 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3589 SuppressRedeclaration = false; 3590 return true; 3591 } 3592 3593 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3594 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3595 SuppressRedeclaration = true; 3596 return Context.hasSameType(TD1->getUnderlyingType(), 3597 TD2->getUnderlyingType()); 3598 } 3599 3600 return false; 3601} 3602 3603 3604/// Determines whether to create a using shadow decl for a particular 3605/// decl, given the set of decls existing prior to this using lookup. 3606bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3607 const LookupResult &Previous) { 3608 // Diagnose finding a decl which is not from a base class of the 3609 // current class. We do this now because there are cases where this 3610 // function will silently decide not to build a shadow decl, which 3611 // will pre-empt further diagnostics. 3612 // 3613 // We don't need to do this in C++0x because we do the check once on 3614 // the qualifier. 3615 // 3616 // FIXME: diagnose the following if we care enough: 3617 // struct A { int foo; }; 3618 // struct B : A { using A::foo; }; 3619 // template <class T> struct C : A {}; 3620 // template <class T> struct D : C<T> { using B::foo; } // <--- 3621 // This is invalid (during instantiation) in C++03 because B::foo 3622 // resolves to the using decl in B, which is not a base class of D<T>. 3623 // We can't diagnose it immediately because C<T> is an unknown 3624 // specialization. The UsingShadowDecl in D<T> then points directly 3625 // to A::foo, which will look well-formed when we instantiate. 3626 // The right solution is to not collapse the shadow-decl chain. 3627 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3628 DeclContext *OrigDC = Orig->getDeclContext(); 3629 3630 // Handle enums and anonymous structs. 3631 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3632 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3633 while (OrigRec->isAnonymousStructOrUnion()) 3634 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3635 3636 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3637 if (OrigDC == CurContext) { 3638 Diag(Using->getLocation(), 3639 diag::err_using_decl_nested_name_specifier_is_current_class) 3640 << Using->getNestedNameRange(); 3641 Diag(Orig->getLocation(), diag::note_using_decl_target); 3642 return true; 3643 } 3644 3645 Diag(Using->getNestedNameRange().getBegin(), 3646 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3647 << Using->getTargetNestedNameDecl() 3648 << cast<CXXRecordDecl>(CurContext) 3649 << Using->getNestedNameRange(); 3650 Diag(Orig->getLocation(), diag::note_using_decl_target); 3651 return true; 3652 } 3653 } 3654 3655 if (Previous.empty()) return false; 3656 3657 NamedDecl *Target = Orig; 3658 if (isa<UsingShadowDecl>(Target)) 3659 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3660 3661 // If the target happens to be one of the previous declarations, we 3662 // don't have a conflict. 3663 // 3664 // FIXME: but we might be increasing its access, in which case we 3665 // should redeclare it. 3666 NamedDecl *NonTag = 0, *Tag = 0; 3667 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3668 I != E; ++I) { 3669 NamedDecl *D = (*I)->getUnderlyingDecl(); 3670 bool Result; 3671 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3672 return Result; 3673 3674 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3675 } 3676 3677 if (Target->isFunctionOrFunctionTemplate()) { 3678 FunctionDecl *FD; 3679 if (isa<FunctionTemplateDecl>(Target)) 3680 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3681 else 3682 FD = cast<FunctionDecl>(Target); 3683 3684 NamedDecl *OldDecl = 0; 3685 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3686 case Ovl_Overload: 3687 return false; 3688 3689 case Ovl_NonFunction: 3690 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3691 break; 3692 3693 // We found a decl with the exact signature. 3694 case Ovl_Match: 3695 // If we're in a record, we want to hide the target, so we 3696 // return true (without a diagnostic) to tell the caller not to 3697 // build a shadow decl. 3698 if (CurContext->isRecord()) 3699 return true; 3700 3701 // If we're not in a record, this is an error. 3702 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3703 break; 3704 } 3705 3706 Diag(Target->getLocation(), diag::note_using_decl_target); 3707 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3708 return true; 3709 } 3710 3711 // Target is not a function. 3712 3713 if (isa<TagDecl>(Target)) { 3714 // No conflict between a tag and a non-tag. 3715 if (!Tag) return false; 3716 3717 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3718 Diag(Target->getLocation(), diag::note_using_decl_target); 3719 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3720 return true; 3721 } 3722 3723 // No conflict between a tag and a non-tag. 3724 if (!NonTag) return false; 3725 3726 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3727 Diag(Target->getLocation(), diag::note_using_decl_target); 3728 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3729 return true; 3730} 3731 3732/// Builds a shadow declaration corresponding to a 'using' declaration. 3733UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3734 UsingDecl *UD, 3735 NamedDecl *Orig) { 3736 3737 // If we resolved to another shadow declaration, just coalesce them. 3738 NamedDecl *Target = Orig; 3739 if (isa<UsingShadowDecl>(Target)) { 3740 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3741 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3742 } 3743 3744 UsingShadowDecl *Shadow 3745 = UsingShadowDecl::Create(Context, CurContext, 3746 UD->getLocation(), UD, Target); 3747 UD->addShadowDecl(Shadow); 3748 3749 Shadow->setAccess(UD->getAccess()); 3750 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3751 Shadow->setInvalidDecl(); 3752 3753 if (S) 3754 PushOnScopeChains(Shadow, S); 3755 else 3756 CurContext->addDecl(Shadow); 3757 3758 3759 return Shadow; 3760} 3761 3762/// Hides a using shadow declaration. This is required by the current 3763/// using-decl implementation when a resolvable using declaration in a 3764/// class is followed by a declaration which would hide or override 3765/// one or more of the using decl's targets; for example: 3766/// 3767/// struct Base { void foo(int); }; 3768/// struct Derived : Base { 3769/// using Base::foo; 3770/// void foo(int); 3771/// }; 3772/// 3773/// The governing language is C++03 [namespace.udecl]p12: 3774/// 3775/// When a using-declaration brings names from a base class into a 3776/// derived class scope, member functions in the derived class 3777/// override and/or hide member functions with the same name and 3778/// parameter types in a base class (rather than conflicting). 3779/// 3780/// There are two ways to implement this: 3781/// (1) optimistically create shadow decls when they're not hidden 3782/// by existing declarations, or 3783/// (2) don't create any shadow decls (or at least don't make them 3784/// visible) until we've fully parsed/instantiated the class. 3785/// The problem with (1) is that we might have to retroactively remove 3786/// a shadow decl, which requires several O(n) operations because the 3787/// decl structures are (very reasonably) not designed for removal. 3788/// (2) avoids this but is very fiddly and phase-dependent. 3789void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3790 if (Shadow->getDeclName().getNameKind() == 3791 DeclarationName::CXXConversionFunctionName) 3792 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3793 3794 // Remove it from the DeclContext... 3795 Shadow->getDeclContext()->removeDecl(Shadow); 3796 3797 // ...and the scope, if applicable... 3798 if (S) { 3799 S->RemoveDecl(Shadow); 3800 IdResolver.RemoveDecl(Shadow); 3801 } 3802 3803 // ...and the using decl. 3804 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3805 3806 // TODO: complain somehow if Shadow was used. It shouldn't 3807 // be possible for this to happen, because...? 3808} 3809 3810/// Builds a using declaration. 3811/// 3812/// \param IsInstantiation - Whether this call arises from an 3813/// instantiation of an unresolved using declaration. We treat 3814/// the lookup differently for these declarations. 3815NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3816 SourceLocation UsingLoc, 3817 CXXScopeSpec &SS, 3818 const DeclarationNameInfo &NameInfo, 3819 AttributeList *AttrList, 3820 bool IsInstantiation, 3821 bool IsTypeName, 3822 SourceLocation TypenameLoc) { 3823 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3824 SourceLocation IdentLoc = NameInfo.getLoc(); 3825 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3826 3827 // FIXME: We ignore attributes for now. 3828 3829 if (SS.isEmpty()) { 3830 Diag(IdentLoc, diag::err_using_requires_qualname); 3831 return 0; 3832 } 3833 3834 // Do the redeclaration lookup in the current scope. 3835 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3836 ForRedeclaration); 3837 Previous.setHideTags(false); 3838 if (S) { 3839 LookupName(Previous, S); 3840 3841 // It is really dumb that we have to do this. 3842 LookupResult::Filter F = Previous.makeFilter(); 3843 while (F.hasNext()) { 3844 NamedDecl *D = F.next(); 3845 if (!isDeclInScope(D, CurContext, S)) 3846 F.erase(); 3847 } 3848 F.done(); 3849 } else { 3850 assert(IsInstantiation && "no scope in non-instantiation"); 3851 assert(CurContext->isRecord() && "scope not record in instantiation"); 3852 LookupQualifiedName(Previous, CurContext); 3853 } 3854 3855 NestedNameSpecifier *NNS = 3856 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3857 3858 // Check for invalid redeclarations. 3859 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3860 return 0; 3861 3862 // Check for bad qualifiers. 3863 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3864 return 0; 3865 3866 DeclContext *LookupContext = computeDeclContext(SS); 3867 NamedDecl *D; 3868 if (!LookupContext) { 3869 if (IsTypeName) { 3870 // FIXME: not all declaration name kinds are legal here 3871 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3872 UsingLoc, TypenameLoc, 3873 SS.getRange(), NNS, 3874 IdentLoc, NameInfo.getName()); 3875 } else { 3876 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3877 UsingLoc, SS.getRange(), 3878 NNS, NameInfo); 3879 } 3880 } else { 3881 D = UsingDecl::Create(Context, CurContext, 3882 SS.getRange(), UsingLoc, NNS, NameInfo, 3883 IsTypeName); 3884 } 3885 D->setAccess(AS); 3886 CurContext->addDecl(D); 3887 3888 if (!LookupContext) return D; 3889 UsingDecl *UD = cast<UsingDecl>(D); 3890 3891 if (RequireCompleteDeclContext(SS, LookupContext)) { 3892 UD->setInvalidDecl(); 3893 return UD; 3894 } 3895 3896 // Look up the target name. 3897 3898 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3899 3900 // Unlike most lookups, we don't always want to hide tag 3901 // declarations: tag names are visible through the using declaration 3902 // even if hidden by ordinary names, *except* in a dependent context 3903 // where it's important for the sanity of two-phase lookup. 3904 if (!IsInstantiation) 3905 R.setHideTags(false); 3906 3907 LookupQualifiedName(R, LookupContext); 3908 3909 if (R.empty()) { 3910 Diag(IdentLoc, diag::err_no_member) 3911 << NameInfo.getName() << LookupContext << SS.getRange(); 3912 UD->setInvalidDecl(); 3913 return UD; 3914 } 3915 3916 if (R.isAmbiguous()) { 3917 UD->setInvalidDecl(); 3918 return UD; 3919 } 3920 3921 if (IsTypeName) { 3922 // If we asked for a typename and got a non-type decl, error out. 3923 if (!R.getAsSingle<TypeDecl>()) { 3924 Diag(IdentLoc, diag::err_using_typename_non_type); 3925 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3926 Diag((*I)->getUnderlyingDecl()->getLocation(), 3927 diag::note_using_decl_target); 3928 UD->setInvalidDecl(); 3929 return UD; 3930 } 3931 } else { 3932 // If we asked for a non-typename and we got a type, error out, 3933 // but only if this is an instantiation of an unresolved using 3934 // decl. Otherwise just silently find the type name. 3935 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3936 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3937 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3938 UD->setInvalidDecl(); 3939 return UD; 3940 } 3941 } 3942 3943 // C++0x N2914 [namespace.udecl]p6: 3944 // A using-declaration shall not name a namespace. 3945 if (R.getAsSingle<NamespaceDecl>()) { 3946 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3947 << SS.getRange(); 3948 UD->setInvalidDecl(); 3949 return UD; 3950 } 3951 3952 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3953 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3954 BuildUsingShadowDecl(S, UD, *I); 3955 } 3956 3957 return UD; 3958} 3959 3960/// Checks that the given using declaration is not an invalid 3961/// redeclaration. Note that this is checking only for the using decl 3962/// itself, not for any ill-formedness among the UsingShadowDecls. 3963bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3964 bool isTypeName, 3965 const CXXScopeSpec &SS, 3966 SourceLocation NameLoc, 3967 const LookupResult &Prev) { 3968 // C++03 [namespace.udecl]p8: 3969 // C++0x [namespace.udecl]p10: 3970 // A using-declaration is a declaration and can therefore be used 3971 // repeatedly where (and only where) multiple declarations are 3972 // allowed. 3973 // 3974 // That's in non-member contexts. 3975 if (!CurContext->getRedeclContext()->isRecord()) 3976 return false; 3977 3978 NestedNameSpecifier *Qual 3979 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3980 3981 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3982 NamedDecl *D = *I; 3983 3984 bool DTypename; 3985 NestedNameSpecifier *DQual; 3986 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3987 DTypename = UD->isTypeName(); 3988 DQual = UD->getTargetNestedNameDecl(); 3989 } else if (UnresolvedUsingValueDecl *UD 3990 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3991 DTypename = false; 3992 DQual = UD->getTargetNestedNameSpecifier(); 3993 } else if (UnresolvedUsingTypenameDecl *UD 3994 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3995 DTypename = true; 3996 DQual = UD->getTargetNestedNameSpecifier(); 3997 } else continue; 3998 3999 // using decls differ if one says 'typename' and the other doesn't. 4000 // FIXME: non-dependent using decls? 4001 if (isTypeName != DTypename) continue; 4002 4003 // using decls differ if they name different scopes (but note that 4004 // template instantiation can cause this check to trigger when it 4005 // didn't before instantiation). 4006 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4007 Context.getCanonicalNestedNameSpecifier(DQual)) 4008 continue; 4009 4010 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4011 Diag(D->getLocation(), diag::note_using_decl) << 1; 4012 return true; 4013 } 4014 4015 return false; 4016} 4017 4018 4019/// Checks that the given nested-name qualifier used in a using decl 4020/// in the current context is appropriately related to the current 4021/// scope. If an error is found, diagnoses it and returns true. 4022bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4023 const CXXScopeSpec &SS, 4024 SourceLocation NameLoc) { 4025 DeclContext *NamedContext = computeDeclContext(SS); 4026 4027 if (!CurContext->isRecord()) { 4028 // C++03 [namespace.udecl]p3: 4029 // C++0x [namespace.udecl]p8: 4030 // A using-declaration for a class member shall be a member-declaration. 4031 4032 // If we weren't able to compute a valid scope, it must be a 4033 // dependent class scope. 4034 if (!NamedContext || NamedContext->isRecord()) { 4035 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4036 << SS.getRange(); 4037 return true; 4038 } 4039 4040 // Otherwise, everything is known to be fine. 4041 return false; 4042 } 4043 4044 // The current scope is a record. 4045 4046 // If the named context is dependent, we can't decide much. 4047 if (!NamedContext) { 4048 // FIXME: in C++0x, we can diagnose if we can prove that the 4049 // nested-name-specifier does not refer to a base class, which is 4050 // still possible in some cases. 4051 4052 // Otherwise we have to conservatively report that things might be 4053 // okay. 4054 return false; 4055 } 4056 4057 if (!NamedContext->isRecord()) { 4058 // Ideally this would point at the last name in the specifier, 4059 // but we don't have that level of source info. 4060 Diag(SS.getRange().getBegin(), 4061 diag::err_using_decl_nested_name_specifier_is_not_class) 4062 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4063 return true; 4064 } 4065 4066 if (!NamedContext->isDependentContext() && 4067 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4068 return true; 4069 4070 if (getLangOptions().CPlusPlus0x) { 4071 // C++0x [namespace.udecl]p3: 4072 // In a using-declaration used as a member-declaration, the 4073 // nested-name-specifier shall name a base class of the class 4074 // being defined. 4075 4076 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4077 cast<CXXRecordDecl>(NamedContext))) { 4078 if (CurContext == NamedContext) { 4079 Diag(NameLoc, 4080 diag::err_using_decl_nested_name_specifier_is_current_class) 4081 << SS.getRange(); 4082 return true; 4083 } 4084 4085 Diag(SS.getRange().getBegin(), 4086 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4087 << (NestedNameSpecifier*) SS.getScopeRep() 4088 << cast<CXXRecordDecl>(CurContext) 4089 << SS.getRange(); 4090 return true; 4091 } 4092 4093 return false; 4094 } 4095 4096 // C++03 [namespace.udecl]p4: 4097 // A using-declaration used as a member-declaration shall refer 4098 // to a member of a base class of the class being defined [etc.]. 4099 4100 // Salient point: SS doesn't have to name a base class as long as 4101 // lookup only finds members from base classes. Therefore we can 4102 // diagnose here only if we can prove that that can't happen, 4103 // i.e. if the class hierarchies provably don't intersect. 4104 4105 // TODO: it would be nice if "definitely valid" results were cached 4106 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4107 // need to be repeated. 4108 4109 struct UserData { 4110 llvm::DenseSet<const CXXRecordDecl*> Bases; 4111 4112 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4113 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4114 Data->Bases.insert(Base); 4115 return true; 4116 } 4117 4118 bool hasDependentBases(const CXXRecordDecl *Class) { 4119 return !Class->forallBases(collect, this); 4120 } 4121 4122 /// Returns true if the base is dependent or is one of the 4123 /// accumulated base classes. 4124 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4125 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4126 return !Data->Bases.count(Base); 4127 } 4128 4129 bool mightShareBases(const CXXRecordDecl *Class) { 4130 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4131 } 4132 }; 4133 4134 UserData Data; 4135 4136 // Returns false if we find a dependent base. 4137 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4138 return false; 4139 4140 // Returns false if the class has a dependent base or if it or one 4141 // of its bases is present in the base set of the current context. 4142 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4143 return false; 4144 4145 Diag(SS.getRange().getBegin(), 4146 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4147 << (NestedNameSpecifier*) SS.getScopeRep() 4148 << cast<CXXRecordDecl>(CurContext) 4149 << SS.getRange(); 4150 4151 return true; 4152} 4153 4154Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4155 SourceLocation NamespaceLoc, 4156 SourceLocation AliasLoc, 4157 IdentifierInfo *Alias, 4158 CXXScopeSpec &SS, 4159 SourceLocation IdentLoc, 4160 IdentifierInfo *Ident) { 4161 4162 // Lookup the namespace name. 4163 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4164 LookupParsedName(R, S, &SS); 4165 4166 // Check if we have a previous declaration with the same name. 4167 NamedDecl *PrevDecl 4168 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4169 ForRedeclaration); 4170 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4171 PrevDecl = 0; 4172 4173 if (PrevDecl) { 4174 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4175 // We already have an alias with the same name that points to the same 4176 // namespace, so don't create a new one. 4177 // FIXME: At some point, we'll want to create the (redundant) 4178 // declaration to maintain better source information. 4179 if (!R.isAmbiguous() && !R.empty() && 4180 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4181 return 0; 4182 } 4183 4184 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4185 diag::err_redefinition_different_kind; 4186 Diag(AliasLoc, DiagID) << Alias; 4187 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4188 return 0; 4189 } 4190 4191 if (R.isAmbiguous()) 4192 return 0; 4193 4194 if (R.empty()) { 4195 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4196 CTC_NoKeywords, 0)) { 4197 if (R.getAsSingle<NamespaceDecl>() || 4198 R.getAsSingle<NamespaceAliasDecl>()) { 4199 if (DeclContext *DC = computeDeclContext(SS, false)) 4200 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4201 << Ident << DC << Corrected << SS.getRange() 4202 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4203 else 4204 Diag(IdentLoc, diag::err_using_directive_suggest) 4205 << Ident << Corrected 4206 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4207 4208 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4209 << Corrected; 4210 4211 Ident = Corrected.getAsIdentifierInfo(); 4212 } else { 4213 R.clear(); 4214 R.setLookupName(Ident); 4215 } 4216 } 4217 4218 if (R.empty()) { 4219 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4220 return 0; 4221 } 4222 } 4223 4224 NamespaceAliasDecl *AliasDecl = 4225 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4226 Alias, SS.getRange(), 4227 (NestedNameSpecifier *)SS.getScopeRep(), 4228 IdentLoc, R.getFoundDecl()); 4229 4230 PushOnScopeChains(AliasDecl, S); 4231 return AliasDecl; 4232} 4233 4234namespace { 4235 /// \brief Scoped object used to handle the state changes required in Sema 4236 /// to implicitly define the body of a C++ member function; 4237 class ImplicitlyDefinedFunctionScope { 4238 Sema &S; 4239 DeclContext *PreviousContext; 4240 4241 public: 4242 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4243 : S(S), PreviousContext(S.CurContext) 4244 { 4245 S.CurContext = Method; 4246 S.PushFunctionScope(); 4247 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4248 } 4249 4250 ~ImplicitlyDefinedFunctionScope() { 4251 S.PopExpressionEvaluationContext(); 4252 S.PopFunctionOrBlockScope(); 4253 S.CurContext = PreviousContext; 4254 } 4255 }; 4256} 4257 4258static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4259 CXXRecordDecl *D) { 4260 ASTContext &Context = Self.Context; 4261 QualType ClassType = Context.getTypeDeclType(D); 4262 DeclarationName ConstructorName 4263 = Context.DeclarationNames.getCXXConstructorName( 4264 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4265 4266 DeclContext::lookup_const_iterator Con, ConEnd; 4267 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4268 Con != ConEnd; ++Con) { 4269 // FIXME: In C++0x, a constructor template can be a default constructor. 4270 if (isa<FunctionTemplateDecl>(*Con)) 4271 continue; 4272 4273 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4274 if (Constructor->isDefaultConstructor()) 4275 return Constructor; 4276 } 4277 return 0; 4278} 4279 4280CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4281 CXXRecordDecl *ClassDecl) { 4282 // C++ [class.ctor]p5: 4283 // A default constructor for a class X is a constructor of class X 4284 // that can be called without an argument. If there is no 4285 // user-declared constructor for class X, a default constructor is 4286 // implicitly declared. An implicitly-declared default constructor 4287 // is an inline public member of its class. 4288 assert(!ClassDecl->hasUserDeclaredConstructor() && 4289 "Should not build implicit default constructor!"); 4290 4291 // C++ [except.spec]p14: 4292 // An implicitly declared special member function (Clause 12) shall have an 4293 // exception-specification. [...] 4294 ImplicitExceptionSpecification ExceptSpec(Context); 4295 4296 // Direct base-class destructors. 4297 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4298 BEnd = ClassDecl->bases_end(); 4299 B != BEnd; ++B) { 4300 if (B->isVirtual()) // Handled below. 4301 continue; 4302 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 // Virtual base-class destructors. 4314 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4315 BEnd = ClassDecl->vbases_end(); 4316 B != BEnd; ++B) { 4317 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4318 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4319 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4320 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4321 else if (CXXConstructorDecl *Constructor 4322 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4323 ExceptSpec.CalledDecl(Constructor); 4324 } 4325 } 4326 4327 // Field destructors. 4328 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4329 FEnd = ClassDecl->field_end(); 4330 F != FEnd; ++F) { 4331 if (const RecordType *RecordTy 4332 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4333 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4334 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4335 ExceptSpec.CalledDecl( 4336 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4337 else if (CXXConstructorDecl *Constructor 4338 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4339 ExceptSpec.CalledDecl(Constructor); 4340 } 4341 } 4342 4343 FunctionProtoType::ExtProtoInfo EPI; 4344 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4345 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4346 EPI.NumExceptions = ExceptSpec.size(); 4347 EPI.Exceptions = ExceptSpec.data(); 4348 4349 // Create the actual constructor declaration. 4350 CanQualType ClassType 4351 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4352 DeclarationName Name 4353 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4354 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4355 CXXConstructorDecl *DefaultCon 4356 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4357 Context.getFunctionType(Context.VoidTy, 4358 0, 0, EPI), 4359 /*TInfo=*/0, 4360 /*isExplicit=*/false, 4361 /*isInline=*/true, 4362 /*isImplicitlyDeclared=*/true); 4363 DefaultCon->setAccess(AS_public); 4364 DefaultCon->setImplicit(); 4365 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4366 4367 // Note that we have declared this constructor. 4368 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4369 4370 if (Scope *S = getScopeForContext(ClassDecl)) 4371 PushOnScopeChains(DefaultCon, S, false); 4372 ClassDecl->addDecl(DefaultCon); 4373 4374 return DefaultCon; 4375} 4376 4377void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4378 CXXConstructorDecl *Constructor) { 4379 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4380 !Constructor->isUsed(false)) && 4381 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4382 4383 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4384 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4385 4386 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4387 DiagnosticErrorTrap Trap(Diags); 4388 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4389 Trap.hasErrorOccurred()) { 4390 Diag(CurrentLocation, diag::note_member_synthesized_at) 4391 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4392 Constructor->setInvalidDecl(); 4393 return; 4394 } 4395 4396 SourceLocation Loc = Constructor->getLocation(); 4397 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4398 4399 Constructor->setUsed(); 4400 MarkVTableUsed(CurrentLocation, ClassDecl); 4401} 4402 4403CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4404 // C++ [class.dtor]p2: 4405 // If a class has no user-declared destructor, a destructor is 4406 // declared implicitly. An implicitly-declared destructor is an 4407 // inline public member of its class. 4408 4409 // C++ [except.spec]p14: 4410 // An implicitly declared special member function (Clause 12) shall have 4411 // an exception-specification. 4412 ImplicitExceptionSpecification ExceptSpec(Context); 4413 4414 // Direct base-class destructors. 4415 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4416 BEnd = ClassDecl->bases_end(); 4417 B != BEnd; ++B) { 4418 if (B->isVirtual()) // Handled below. 4419 continue; 4420 4421 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4422 ExceptSpec.CalledDecl( 4423 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4424 } 4425 4426 // Virtual base-class destructors. 4427 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4428 BEnd = ClassDecl->vbases_end(); 4429 B != BEnd; ++B) { 4430 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4431 ExceptSpec.CalledDecl( 4432 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4433 } 4434 4435 // Field destructors. 4436 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4437 FEnd = ClassDecl->field_end(); 4438 F != FEnd; ++F) { 4439 if (const RecordType *RecordTy 4440 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4441 ExceptSpec.CalledDecl( 4442 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4443 } 4444 4445 // Create the actual destructor declaration. 4446 FunctionProtoType::ExtProtoInfo EPI; 4447 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4448 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4449 EPI.NumExceptions = ExceptSpec.size(); 4450 EPI.Exceptions = ExceptSpec.data(); 4451 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4452 4453 CanQualType ClassType 4454 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4455 DeclarationName Name 4456 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4457 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4458 CXXDestructorDecl *Destructor 4459 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4460 /*isInline=*/true, 4461 /*isImplicitlyDeclared=*/true); 4462 Destructor->setAccess(AS_public); 4463 Destructor->setImplicit(); 4464 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4465 4466 // Note that we have declared this destructor. 4467 ++ASTContext::NumImplicitDestructorsDeclared; 4468 4469 // Introduce this destructor into its scope. 4470 if (Scope *S = getScopeForContext(ClassDecl)) 4471 PushOnScopeChains(Destructor, S, false); 4472 ClassDecl->addDecl(Destructor); 4473 4474 // This could be uniqued if it ever proves significant. 4475 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4476 4477 AddOverriddenMethods(ClassDecl, Destructor); 4478 4479 return Destructor; 4480} 4481 4482void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4483 CXXDestructorDecl *Destructor) { 4484 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4485 "DefineImplicitDestructor - call it for implicit default dtor"); 4486 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4487 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4488 4489 if (Destructor->isInvalidDecl()) 4490 return; 4491 4492 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4493 4494 DiagnosticErrorTrap Trap(Diags); 4495 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4496 Destructor->getParent()); 4497 4498 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4499 Diag(CurrentLocation, diag::note_member_synthesized_at) 4500 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4501 4502 Destructor->setInvalidDecl(); 4503 return; 4504 } 4505 4506 SourceLocation Loc = Destructor->getLocation(); 4507 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4508 4509 Destructor->setUsed(); 4510 MarkVTableUsed(CurrentLocation, ClassDecl); 4511} 4512 4513/// \brief Builds a statement that copies the given entity from \p From to 4514/// \c To. 4515/// 4516/// This routine is used to copy the members of a class with an 4517/// implicitly-declared copy assignment operator. When the entities being 4518/// copied are arrays, this routine builds for loops to copy them. 4519/// 4520/// \param S The Sema object used for type-checking. 4521/// 4522/// \param Loc The location where the implicit copy is being generated. 4523/// 4524/// \param T The type of the expressions being copied. Both expressions must 4525/// have this type. 4526/// 4527/// \param To The expression we are copying to. 4528/// 4529/// \param From The expression we are copying from. 4530/// 4531/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4532/// Otherwise, it's a non-static member subobject. 4533/// 4534/// \param Depth Internal parameter recording the depth of the recursion. 4535/// 4536/// \returns A statement or a loop that copies the expressions. 4537static StmtResult 4538BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4539 Expr *To, Expr *From, 4540 bool CopyingBaseSubobject, unsigned Depth = 0) { 4541 // C++0x [class.copy]p30: 4542 // Each subobject is assigned in the manner appropriate to its type: 4543 // 4544 // - if the subobject is of class type, the copy assignment operator 4545 // for the class is used (as if by explicit qualification; that is, 4546 // ignoring any possible virtual overriding functions in more derived 4547 // classes); 4548 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4549 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4550 4551 // Look for operator=. 4552 DeclarationName Name 4553 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4554 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4555 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4556 4557 // Filter out any result that isn't a copy-assignment operator. 4558 LookupResult::Filter F = OpLookup.makeFilter(); 4559 while (F.hasNext()) { 4560 NamedDecl *D = F.next(); 4561 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4562 if (Method->isCopyAssignmentOperator()) 4563 continue; 4564 4565 F.erase(); 4566 } 4567 F.done(); 4568 4569 // Suppress the protected check (C++ [class.protected]) for each of the 4570 // assignment operators we found. This strange dance is required when 4571 // we're assigning via a base classes's copy-assignment operator. To 4572 // ensure that we're getting the right base class subobject (without 4573 // ambiguities), we need to cast "this" to that subobject type; to 4574 // ensure that we don't go through the virtual call mechanism, we need 4575 // to qualify the operator= name with the base class (see below). However, 4576 // this means that if the base class has a protected copy assignment 4577 // operator, the protected member access check will fail. So, we 4578 // rewrite "protected" access to "public" access in this case, since we 4579 // know by construction that we're calling from a derived class. 4580 if (CopyingBaseSubobject) { 4581 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4582 L != LEnd; ++L) { 4583 if (L.getAccess() == AS_protected) 4584 L.setAccess(AS_public); 4585 } 4586 } 4587 4588 // Create the nested-name-specifier that will be used to qualify the 4589 // reference to operator=; this is required to suppress the virtual 4590 // call mechanism. 4591 CXXScopeSpec SS; 4592 SS.setRange(Loc); 4593 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4594 T.getTypePtr())); 4595 4596 // Create the reference to operator=. 4597 ExprResult OpEqualRef 4598 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4599 /*FirstQualifierInScope=*/0, OpLookup, 4600 /*TemplateArgs=*/0, 4601 /*SuppressQualifierCheck=*/true); 4602 if (OpEqualRef.isInvalid()) 4603 return StmtError(); 4604 4605 // Build the call to the assignment operator. 4606 4607 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4608 OpEqualRef.takeAs<Expr>(), 4609 Loc, &From, 1, Loc); 4610 if (Call.isInvalid()) 4611 return StmtError(); 4612 4613 return S.Owned(Call.takeAs<Stmt>()); 4614 } 4615 4616 // - if the subobject is of scalar type, the built-in assignment 4617 // operator is used. 4618 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4619 if (!ArrayTy) { 4620 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4621 if (Assignment.isInvalid()) 4622 return StmtError(); 4623 4624 return S.Owned(Assignment.takeAs<Stmt>()); 4625 } 4626 4627 // - if the subobject is an array, each element is assigned, in the 4628 // manner appropriate to the element type; 4629 4630 // Construct a loop over the array bounds, e.g., 4631 // 4632 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4633 // 4634 // that will copy each of the array elements. 4635 QualType SizeType = S.Context.getSizeType(); 4636 4637 // Create the iteration variable. 4638 IdentifierInfo *IterationVarName = 0; 4639 { 4640 llvm::SmallString<8> Str; 4641 llvm::raw_svector_ostream OS(Str); 4642 OS << "__i" << Depth; 4643 IterationVarName = &S.Context.Idents.get(OS.str()); 4644 } 4645 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4646 IterationVarName, SizeType, 4647 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4648 SC_None, SC_None); 4649 4650 // Initialize the iteration variable to zero. 4651 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4652 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4653 4654 // Create a reference to the iteration variable; we'll use this several 4655 // times throughout. 4656 Expr *IterationVarRef 4657 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 4658 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4659 4660 // Create the DeclStmt that holds the iteration variable. 4661 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4662 4663 // Create the comparison against the array bound. 4664 llvm::APInt Upper 4665 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 4666 Expr *Comparison 4667 = new (S.Context) BinaryOperator(IterationVarRef, 4668 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 4669 BO_NE, S.Context.BoolTy, 4670 VK_RValue, OK_Ordinary, Loc); 4671 4672 // Create the pre-increment of the iteration variable. 4673 Expr *Increment 4674 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 4675 VK_LValue, OK_Ordinary, Loc); 4676 4677 // Subscript the "from" and "to" expressions with the iteration variable. 4678 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4679 IterationVarRef, Loc)); 4680 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4681 IterationVarRef, Loc)); 4682 4683 // Build the copy for an individual element of the array. 4684 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 4685 To, From, CopyingBaseSubobject, 4686 Depth + 1); 4687 if (Copy.isInvalid()) 4688 return StmtError(); 4689 4690 // Construct the loop that copies all elements of this array. 4691 return S.ActOnForStmt(Loc, Loc, InitStmt, 4692 S.MakeFullExpr(Comparison), 4693 0, S.MakeFullExpr(Increment), 4694 Loc, Copy.take()); 4695} 4696 4697/// \brief Determine whether the given class has a copy assignment operator 4698/// that accepts a const-qualified argument. 4699static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4700 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4701 4702 if (!Class->hasDeclaredCopyAssignment()) 4703 S.DeclareImplicitCopyAssignment(Class); 4704 4705 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4706 DeclarationName OpName 4707 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4708 4709 DeclContext::lookup_const_iterator Op, OpEnd; 4710 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4711 // C++ [class.copy]p9: 4712 // A user-declared copy assignment operator is a non-static non-template 4713 // member function of class X with exactly one parameter of type X, X&, 4714 // const X&, volatile X& or const volatile X&. 4715 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4716 if (!Method) 4717 continue; 4718 4719 if (Method->isStatic()) 4720 continue; 4721 if (Method->getPrimaryTemplate()) 4722 continue; 4723 const FunctionProtoType *FnType = 4724 Method->getType()->getAs<FunctionProtoType>(); 4725 assert(FnType && "Overloaded operator has no prototype."); 4726 // Don't assert on this; an invalid decl might have been left in the AST. 4727 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4728 continue; 4729 bool AcceptsConst = true; 4730 QualType ArgType = FnType->getArgType(0); 4731 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4732 ArgType = Ref->getPointeeType(); 4733 // Is it a non-const lvalue reference? 4734 if (!ArgType.isConstQualified()) 4735 AcceptsConst = false; 4736 } 4737 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4738 continue; 4739 4740 // We have a single argument of type cv X or cv X&, i.e. we've found the 4741 // copy assignment operator. Return whether it accepts const arguments. 4742 return AcceptsConst; 4743 } 4744 assert(Class->isInvalidDecl() && 4745 "No copy assignment operator declared in valid code."); 4746 return false; 4747} 4748 4749CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4750 // Note: The following rules are largely analoguous to the copy 4751 // constructor rules. Note that virtual bases are not taken into account 4752 // for determining the argument type of the operator. Note also that 4753 // operators taking an object instead of a reference are allowed. 4754 4755 4756 // C++ [class.copy]p10: 4757 // If the class definition does not explicitly declare a copy 4758 // assignment operator, one is declared implicitly. 4759 // The implicitly-defined copy assignment operator for a class X 4760 // will have the form 4761 // 4762 // X& X::operator=(const X&) 4763 // 4764 // if 4765 bool HasConstCopyAssignment = true; 4766 4767 // -- each direct base class B of X has a copy assignment operator 4768 // whose parameter is of type const B&, const volatile B& or B, 4769 // and 4770 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4771 BaseEnd = ClassDecl->bases_end(); 4772 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4773 assert(!Base->getType()->isDependentType() && 4774 "Cannot generate implicit members for class with dependent bases."); 4775 const CXXRecordDecl *BaseClassDecl 4776 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4777 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4778 } 4779 4780 // -- for all the nonstatic data members of X that are of a class 4781 // type M (or array thereof), each such class type has a copy 4782 // assignment operator whose parameter is of type const M&, 4783 // const volatile M& or M. 4784 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4785 FieldEnd = ClassDecl->field_end(); 4786 HasConstCopyAssignment && Field != FieldEnd; 4787 ++Field) { 4788 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4789 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4790 const CXXRecordDecl *FieldClassDecl 4791 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4792 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4793 } 4794 } 4795 4796 // Otherwise, the implicitly declared copy assignment operator will 4797 // have the form 4798 // 4799 // X& X::operator=(X&) 4800 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4801 QualType RetType = Context.getLValueReferenceType(ArgType); 4802 if (HasConstCopyAssignment) 4803 ArgType = ArgType.withConst(); 4804 ArgType = Context.getLValueReferenceType(ArgType); 4805 4806 // C++ [except.spec]p14: 4807 // An implicitly declared special member function (Clause 12) shall have an 4808 // exception-specification. [...] 4809 ImplicitExceptionSpecification ExceptSpec(Context); 4810 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4811 BaseEnd = ClassDecl->bases_end(); 4812 Base != BaseEnd; ++Base) { 4813 CXXRecordDecl *BaseClassDecl 4814 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4815 4816 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4817 DeclareImplicitCopyAssignment(BaseClassDecl); 4818 4819 if (CXXMethodDecl *CopyAssign 4820 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4821 ExceptSpec.CalledDecl(CopyAssign); 4822 } 4823 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4824 FieldEnd = ClassDecl->field_end(); 4825 Field != FieldEnd; 4826 ++Field) { 4827 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4828 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4829 CXXRecordDecl *FieldClassDecl 4830 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4831 4832 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4833 DeclareImplicitCopyAssignment(FieldClassDecl); 4834 4835 if (CXXMethodDecl *CopyAssign 4836 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4837 ExceptSpec.CalledDecl(CopyAssign); 4838 } 4839 } 4840 4841 // An implicitly-declared copy assignment operator is an inline public 4842 // member of its class. 4843 FunctionProtoType::ExtProtoInfo EPI; 4844 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4845 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4846 EPI.NumExceptions = ExceptSpec.size(); 4847 EPI.Exceptions = ExceptSpec.data(); 4848 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4849 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4850 CXXMethodDecl *CopyAssignment 4851 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4852 Context.getFunctionType(RetType, &ArgType, 1, EPI), 4853 /*TInfo=*/0, /*isStatic=*/false, 4854 /*StorageClassAsWritten=*/SC_None, 4855 /*isInline=*/true); 4856 CopyAssignment->setAccess(AS_public); 4857 CopyAssignment->setImplicit(); 4858 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4859 4860 // Add the parameter to the operator. 4861 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4862 ClassDecl->getLocation(), 4863 /*Id=*/0, 4864 ArgType, /*TInfo=*/0, 4865 SC_None, 4866 SC_None, 0); 4867 CopyAssignment->setParams(&FromParam, 1); 4868 4869 // Note that we have added this copy-assignment operator. 4870 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4871 4872 if (Scope *S = getScopeForContext(ClassDecl)) 4873 PushOnScopeChains(CopyAssignment, S, false); 4874 ClassDecl->addDecl(CopyAssignment); 4875 4876 AddOverriddenMethods(ClassDecl, CopyAssignment); 4877 return CopyAssignment; 4878} 4879 4880void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4881 CXXMethodDecl *CopyAssignOperator) { 4882 assert((CopyAssignOperator->isImplicit() && 4883 CopyAssignOperator->isOverloadedOperator() && 4884 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4885 !CopyAssignOperator->isUsed(false)) && 4886 "DefineImplicitCopyAssignment called for wrong function"); 4887 4888 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4889 4890 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4891 CopyAssignOperator->setInvalidDecl(); 4892 return; 4893 } 4894 4895 CopyAssignOperator->setUsed(); 4896 4897 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4898 DiagnosticErrorTrap Trap(Diags); 4899 4900 // C++0x [class.copy]p30: 4901 // The implicitly-defined or explicitly-defaulted copy assignment operator 4902 // for a non-union class X performs memberwise copy assignment of its 4903 // subobjects. The direct base classes of X are assigned first, in the 4904 // order of their declaration in the base-specifier-list, and then the 4905 // immediate non-static data members of X are assigned, in the order in 4906 // which they were declared in the class definition. 4907 4908 // The statements that form the synthesized function body. 4909 ASTOwningVector<Stmt*> Statements(*this); 4910 4911 // The parameter for the "other" object, which we are copying from. 4912 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4913 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4914 QualType OtherRefType = Other->getType(); 4915 if (const LValueReferenceType *OtherRef 4916 = OtherRefType->getAs<LValueReferenceType>()) { 4917 OtherRefType = OtherRef->getPointeeType(); 4918 OtherQuals = OtherRefType.getQualifiers(); 4919 } 4920 4921 // Our location for everything implicitly-generated. 4922 SourceLocation Loc = CopyAssignOperator->getLocation(); 4923 4924 // Construct a reference to the "other" object. We'll be using this 4925 // throughout the generated ASTs. 4926 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 4927 assert(OtherRef && "Reference to parameter cannot fail!"); 4928 4929 // Construct the "this" pointer. We'll be using this throughout the generated 4930 // ASTs. 4931 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4932 assert(This && "Reference to this cannot fail!"); 4933 4934 // Assign base classes. 4935 bool Invalid = false; 4936 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4937 E = ClassDecl->bases_end(); Base != E; ++Base) { 4938 // Form the assignment: 4939 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4940 QualType BaseType = Base->getType().getUnqualifiedType(); 4941 CXXRecordDecl *BaseClassDecl = 0; 4942 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4943 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4944 else { 4945 Invalid = true; 4946 continue; 4947 } 4948 4949 CXXCastPath BasePath; 4950 BasePath.push_back(Base); 4951 4952 // Construct the "from" expression, which is an implicit cast to the 4953 // appropriately-qualified base type. 4954 Expr *From = OtherRef; 4955 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4956 CK_UncheckedDerivedToBase, 4957 VK_LValue, &BasePath); 4958 4959 // Dereference "this". 4960 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4961 4962 // Implicitly cast "this" to the appropriately-qualified base type. 4963 Expr *ToE = To.takeAs<Expr>(); 4964 ImpCastExprToType(ToE, 4965 Context.getCVRQualifiedType(BaseType, 4966 CopyAssignOperator->getTypeQualifiers()), 4967 CK_UncheckedDerivedToBase, 4968 VK_LValue, &BasePath); 4969 To = Owned(ToE); 4970 4971 // Build the copy. 4972 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4973 To.get(), From, 4974 /*CopyingBaseSubobject=*/true); 4975 if (Copy.isInvalid()) { 4976 Diag(CurrentLocation, diag::note_member_synthesized_at) 4977 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4978 CopyAssignOperator->setInvalidDecl(); 4979 return; 4980 } 4981 4982 // Success! Record the copy. 4983 Statements.push_back(Copy.takeAs<Expr>()); 4984 } 4985 4986 // \brief Reference to the __builtin_memcpy function. 4987 Expr *BuiltinMemCpyRef = 0; 4988 // \brief Reference to the __builtin_objc_memmove_collectable function. 4989 Expr *CollectableMemCpyRef = 0; 4990 4991 // Assign non-static members. 4992 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4993 FieldEnd = ClassDecl->field_end(); 4994 Field != FieldEnd; ++Field) { 4995 // Check for members of reference type; we can't copy those. 4996 if (Field->getType()->isReferenceType()) { 4997 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4998 << Context.getTagDeclType(ClassDecl) << 0 << 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 // Check for members of const-qualified, non-class type. 5007 QualType BaseType = Context.getBaseElementType(Field->getType()); 5008 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5009 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5010 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5011 Diag(Field->getLocation(), diag::note_declared_at); 5012 Diag(CurrentLocation, diag::note_member_synthesized_at) 5013 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5014 Invalid = true; 5015 continue; 5016 } 5017 5018 QualType FieldType = Field->getType().getNonReferenceType(); 5019 if (FieldType->isIncompleteArrayType()) { 5020 assert(ClassDecl->hasFlexibleArrayMember() && 5021 "Incomplete array type is not valid"); 5022 continue; 5023 } 5024 5025 // Build references to the field in the object we're copying from and to. 5026 CXXScopeSpec SS; // Intentionally empty 5027 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5028 LookupMemberName); 5029 MemberLookup.addDecl(*Field); 5030 MemberLookup.resolveKind(); 5031 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5032 Loc, /*IsArrow=*/false, 5033 SS, 0, MemberLookup, 0); 5034 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5035 Loc, /*IsArrow=*/true, 5036 SS, 0, MemberLookup, 0); 5037 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5038 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5039 5040 // If the field should be copied with __builtin_memcpy rather than via 5041 // explicit assignments, do so. This optimization only applies for arrays 5042 // of scalars and arrays of class type with trivial copy-assignment 5043 // operators. 5044 if (FieldType->isArrayType() && 5045 (!BaseType->isRecordType() || 5046 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5047 ->hasTrivialCopyAssignment())) { 5048 // Compute the size of the memory buffer to be copied. 5049 QualType SizeType = Context.getSizeType(); 5050 llvm::APInt Size(Context.getTypeSize(SizeType), 5051 Context.getTypeSizeInChars(BaseType).getQuantity()); 5052 for (const ConstantArrayType *Array 5053 = Context.getAsConstantArrayType(FieldType); 5054 Array; 5055 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5056 llvm::APInt ArraySize 5057 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5058 Size *= ArraySize; 5059 } 5060 5061 // Take the address of the field references for "from" and "to". 5062 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5063 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5064 5065 bool NeedsCollectableMemCpy = 5066 (BaseType->isRecordType() && 5067 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5068 5069 if (NeedsCollectableMemCpy) { 5070 if (!CollectableMemCpyRef) { 5071 // Create a reference to the __builtin_objc_memmove_collectable function. 5072 LookupResult R(*this, 5073 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5074 Loc, LookupOrdinaryName); 5075 LookupName(R, TUScope, true); 5076 5077 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5078 if (!CollectableMemCpy) { 5079 // Something went horribly wrong earlier, and we will have 5080 // complained about it. 5081 Invalid = true; 5082 continue; 5083 } 5084 5085 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5086 CollectableMemCpy->getType(), 5087 VK_LValue, Loc, 0).take(); 5088 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5089 } 5090 } 5091 // Create a reference to the __builtin_memcpy builtin function. 5092 else if (!BuiltinMemCpyRef) { 5093 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5094 LookupOrdinaryName); 5095 LookupName(R, TUScope, true); 5096 5097 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5098 if (!BuiltinMemCpy) { 5099 // Something went horribly wrong earlier, and we will have complained 5100 // about it. 5101 Invalid = true; 5102 continue; 5103 } 5104 5105 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5106 BuiltinMemCpy->getType(), 5107 VK_LValue, Loc, 0).take(); 5108 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5109 } 5110 5111 ASTOwningVector<Expr*> CallArgs(*this); 5112 CallArgs.push_back(To.takeAs<Expr>()); 5113 CallArgs.push_back(From.takeAs<Expr>()); 5114 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5115 ExprResult Call = ExprError(); 5116 if (NeedsCollectableMemCpy) 5117 Call = ActOnCallExpr(/*Scope=*/0, 5118 CollectableMemCpyRef, 5119 Loc, move_arg(CallArgs), 5120 Loc); 5121 else 5122 Call = ActOnCallExpr(/*Scope=*/0, 5123 BuiltinMemCpyRef, 5124 Loc, move_arg(CallArgs), 5125 Loc); 5126 5127 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5128 Statements.push_back(Call.takeAs<Expr>()); 5129 continue; 5130 } 5131 5132 // Build the copy of this field. 5133 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5134 To.get(), From.get(), 5135 /*CopyingBaseSubobject=*/false); 5136 if (Copy.isInvalid()) { 5137 Diag(CurrentLocation, diag::note_member_synthesized_at) 5138 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5139 CopyAssignOperator->setInvalidDecl(); 5140 return; 5141 } 5142 5143 // Success! Record the copy. 5144 Statements.push_back(Copy.takeAs<Stmt>()); 5145 } 5146 5147 if (!Invalid) { 5148 // Add a "return *this;" 5149 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5150 5151 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5152 if (Return.isInvalid()) 5153 Invalid = true; 5154 else { 5155 Statements.push_back(Return.takeAs<Stmt>()); 5156 5157 if (Trap.hasErrorOccurred()) { 5158 Diag(CurrentLocation, diag::note_member_synthesized_at) 5159 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5160 Invalid = true; 5161 } 5162 } 5163 } 5164 5165 if (Invalid) { 5166 CopyAssignOperator->setInvalidDecl(); 5167 return; 5168 } 5169 5170 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5171 /*isStmtExpr=*/false); 5172 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5173 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5174} 5175 5176CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5177 CXXRecordDecl *ClassDecl) { 5178 // C++ [class.copy]p4: 5179 // If the class definition does not explicitly declare a copy 5180 // constructor, one is declared implicitly. 5181 5182 // C++ [class.copy]p5: 5183 // The implicitly-declared copy constructor for a class X will 5184 // have the form 5185 // 5186 // X::X(const X&) 5187 // 5188 // if 5189 bool HasConstCopyConstructor = true; 5190 5191 // -- each direct or virtual base class B of X has a copy 5192 // constructor whose first parameter is of type const B& or 5193 // const volatile B&, and 5194 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5195 BaseEnd = ClassDecl->bases_end(); 5196 HasConstCopyConstructor && Base != BaseEnd; 5197 ++Base) { 5198 // Virtual bases are handled below. 5199 if (Base->isVirtual()) 5200 continue; 5201 5202 CXXRecordDecl *BaseClassDecl 5203 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5204 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5205 DeclareImplicitCopyConstructor(BaseClassDecl); 5206 5207 HasConstCopyConstructor 5208 = BaseClassDecl->hasConstCopyConstructor(Context); 5209 } 5210 5211 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5212 BaseEnd = ClassDecl->vbases_end(); 5213 HasConstCopyConstructor && Base != BaseEnd; 5214 ++Base) { 5215 CXXRecordDecl *BaseClassDecl 5216 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5217 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5218 DeclareImplicitCopyConstructor(BaseClassDecl); 5219 5220 HasConstCopyConstructor 5221 = BaseClassDecl->hasConstCopyConstructor(Context); 5222 } 5223 5224 // -- for all the nonstatic data members of X that are of a 5225 // class type M (or array thereof), each such class type 5226 // has a copy constructor whose first parameter is of type 5227 // const M& or const volatile M&. 5228 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5229 FieldEnd = ClassDecl->field_end(); 5230 HasConstCopyConstructor && Field != FieldEnd; 5231 ++Field) { 5232 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5233 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5234 CXXRecordDecl *FieldClassDecl 5235 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5236 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5237 DeclareImplicitCopyConstructor(FieldClassDecl); 5238 5239 HasConstCopyConstructor 5240 = FieldClassDecl->hasConstCopyConstructor(Context); 5241 } 5242 } 5243 5244 // Otherwise, the implicitly declared copy constructor will have 5245 // the form 5246 // 5247 // X::X(X&) 5248 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5249 QualType ArgType = ClassType; 5250 if (HasConstCopyConstructor) 5251 ArgType = ArgType.withConst(); 5252 ArgType = Context.getLValueReferenceType(ArgType); 5253 5254 // C++ [except.spec]p14: 5255 // An implicitly declared special member function (Clause 12) shall have an 5256 // exception-specification. [...] 5257 ImplicitExceptionSpecification ExceptSpec(Context); 5258 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5259 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5260 BaseEnd = ClassDecl->bases_end(); 5261 Base != BaseEnd; 5262 ++Base) { 5263 // Virtual bases are handled below. 5264 if (Base->isVirtual()) 5265 continue; 5266 5267 CXXRecordDecl *BaseClassDecl 5268 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5269 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5270 DeclareImplicitCopyConstructor(BaseClassDecl); 5271 5272 if (CXXConstructorDecl *CopyConstructor 5273 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5274 ExceptSpec.CalledDecl(CopyConstructor); 5275 } 5276 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5277 BaseEnd = ClassDecl->vbases_end(); 5278 Base != BaseEnd; 5279 ++Base) { 5280 CXXRecordDecl *BaseClassDecl 5281 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5282 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5283 DeclareImplicitCopyConstructor(BaseClassDecl); 5284 5285 if (CXXConstructorDecl *CopyConstructor 5286 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5287 ExceptSpec.CalledDecl(CopyConstructor); 5288 } 5289 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5290 FieldEnd = ClassDecl->field_end(); 5291 Field != FieldEnd; 5292 ++Field) { 5293 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5294 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5295 CXXRecordDecl *FieldClassDecl 5296 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5297 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5298 DeclareImplicitCopyConstructor(FieldClassDecl); 5299 5300 if (CXXConstructorDecl *CopyConstructor 5301 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5302 ExceptSpec.CalledDecl(CopyConstructor); 5303 } 5304 } 5305 5306 // An implicitly-declared copy constructor is an inline public 5307 // member of its class. 5308 FunctionProtoType::ExtProtoInfo EPI; 5309 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5310 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5311 EPI.NumExceptions = ExceptSpec.size(); 5312 EPI.Exceptions = ExceptSpec.data(); 5313 DeclarationName Name 5314 = Context.DeclarationNames.getCXXConstructorName( 5315 Context.getCanonicalType(ClassType)); 5316 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5317 CXXConstructorDecl *CopyConstructor 5318 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5319 Context.getFunctionType(Context.VoidTy, 5320 &ArgType, 1, EPI), 5321 /*TInfo=*/0, 5322 /*isExplicit=*/false, 5323 /*isInline=*/true, 5324 /*isImplicitlyDeclared=*/true); 5325 CopyConstructor->setAccess(AS_public); 5326 CopyConstructor->setImplicit(); 5327 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5328 5329 // Note that we have declared this constructor. 5330 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5331 5332 // Add the parameter to the constructor. 5333 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5334 ClassDecl->getLocation(), 5335 /*IdentifierInfo=*/0, 5336 ArgType, /*TInfo=*/0, 5337 SC_None, 5338 SC_None, 0); 5339 CopyConstructor->setParams(&FromParam, 1); 5340 if (Scope *S = getScopeForContext(ClassDecl)) 5341 PushOnScopeChains(CopyConstructor, S, false); 5342 ClassDecl->addDecl(CopyConstructor); 5343 5344 return CopyConstructor; 5345} 5346 5347void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5348 CXXConstructorDecl *CopyConstructor, 5349 unsigned TypeQuals) { 5350 assert((CopyConstructor->isImplicit() && 5351 CopyConstructor->isCopyConstructor(TypeQuals) && 5352 !CopyConstructor->isUsed(false)) && 5353 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5354 5355 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5356 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5357 5358 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5359 DiagnosticErrorTrap Trap(Diags); 5360 5361 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5362 Trap.hasErrorOccurred()) { 5363 Diag(CurrentLocation, diag::note_member_synthesized_at) 5364 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5365 CopyConstructor->setInvalidDecl(); 5366 } else { 5367 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5368 CopyConstructor->getLocation(), 5369 MultiStmtArg(*this, 0, 0), 5370 /*isStmtExpr=*/false) 5371 .takeAs<Stmt>()); 5372 } 5373 5374 CopyConstructor->setUsed(); 5375} 5376 5377ExprResult 5378Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5379 CXXConstructorDecl *Constructor, 5380 MultiExprArg ExprArgs, 5381 bool RequiresZeroInit, 5382 unsigned ConstructKind, 5383 SourceRange ParenRange) { 5384 bool Elidable = false; 5385 5386 // C++0x [class.copy]p34: 5387 // When certain criteria are met, an implementation is allowed to 5388 // omit the copy/move construction of a class object, even if the 5389 // copy/move constructor and/or destructor for the object have 5390 // side effects. [...] 5391 // - when a temporary class object that has not been bound to a 5392 // reference (12.2) would be copied/moved to a class object 5393 // with the same cv-unqualified type, the copy/move operation 5394 // can be omitted by constructing the temporary object 5395 // directly into the target of the omitted copy/move 5396 if (ConstructKind == CXXConstructExpr::CK_Complete && 5397 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5398 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5399 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5400 } 5401 5402 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5403 Elidable, move(ExprArgs), RequiresZeroInit, 5404 ConstructKind, ParenRange); 5405} 5406 5407/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5408/// including handling of its default argument expressions. 5409ExprResult 5410Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5411 CXXConstructorDecl *Constructor, bool Elidable, 5412 MultiExprArg ExprArgs, 5413 bool RequiresZeroInit, 5414 unsigned ConstructKind, 5415 SourceRange ParenRange) { 5416 unsigned NumExprs = ExprArgs.size(); 5417 Expr **Exprs = (Expr **)ExprArgs.release(); 5418 5419 MarkDeclarationReferenced(ConstructLoc, Constructor); 5420 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5421 Constructor, Elidable, Exprs, NumExprs, 5422 RequiresZeroInit, 5423 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5424 ParenRange)); 5425} 5426 5427bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5428 CXXConstructorDecl *Constructor, 5429 MultiExprArg Exprs) { 5430 // FIXME: Provide the correct paren SourceRange when available. 5431 ExprResult TempResult = 5432 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5433 move(Exprs), false, CXXConstructExpr::CK_Complete, 5434 SourceRange()); 5435 if (TempResult.isInvalid()) 5436 return true; 5437 5438 Expr *Temp = TempResult.takeAs<Expr>(); 5439 CheckImplicitConversions(Temp, VD->getLocation()); 5440 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5441 Temp = MaybeCreateExprWithCleanups(Temp); 5442 VD->setInit(Temp); 5443 5444 return false; 5445} 5446 5447void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5448 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5449 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5450 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5451 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5452 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5453 CheckDestructorAccess(VD->getLocation(), Destructor, 5454 PDiag(diag::err_access_dtor_var) 5455 << VD->getDeclName() 5456 << VD->getType()); 5457 5458 // TODO: this should be re-enabled for static locals by !CXAAtExit 5459 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5460 Diag(VD->getLocation(), diag::warn_global_destructor); 5461 } 5462} 5463 5464/// AddCXXDirectInitializerToDecl - This action is called immediately after 5465/// ActOnDeclarator, when a C++ direct initializer is present. 5466/// e.g: "int x(1);" 5467void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5468 SourceLocation LParenLoc, 5469 MultiExprArg Exprs, 5470 SourceLocation RParenLoc) { 5471 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5472 5473 // If there is no declaration, there was an error parsing it. Just ignore 5474 // the initializer. 5475 if (RealDecl == 0) 5476 return; 5477 5478 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5479 if (!VDecl) { 5480 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5481 RealDecl->setInvalidDecl(); 5482 return; 5483 } 5484 5485 // We will represent direct-initialization similarly to copy-initialization: 5486 // int x(1); -as-> int x = 1; 5487 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5488 // 5489 // Clients that want to distinguish between the two forms, can check for 5490 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5491 // A major benefit is that clients that don't particularly care about which 5492 // exactly form was it (like the CodeGen) can handle both cases without 5493 // special case code. 5494 5495 // C++ 8.5p11: 5496 // The form of initialization (using parentheses or '=') is generally 5497 // insignificant, but does matter when the entity being initialized has a 5498 // class type. 5499 5500 if (!VDecl->getType()->isDependentType() && 5501 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5502 diag::err_typecheck_decl_incomplete_type)) { 5503 VDecl->setInvalidDecl(); 5504 return; 5505 } 5506 5507 // The variable can not have an abstract class type. 5508 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5509 diag::err_abstract_type_in_decl, 5510 AbstractVariableType)) 5511 VDecl->setInvalidDecl(); 5512 5513 const VarDecl *Def; 5514 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5515 Diag(VDecl->getLocation(), diag::err_redefinition) 5516 << VDecl->getDeclName(); 5517 Diag(Def->getLocation(), diag::note_previous_definition); 5518 VDecl->setInvalidDecl(); 5519 return; 5520 } 5521 5522 // C++ [class.static.data]p4 5523 // If a static data member is of const integral or const 5524 // enumeration type, its declaration in the class definition can 5525 // specify a constant-initializer which shall be an integral 5526 // constant expression (5.19). In that case, the member can appear 5527 // in integral constant expressions. The member shall still be 5528 // defined in a namespace scope if it is used in the program and the 5529 // namespace scope definition shall not contain an initializer. 5530 // 5531 // We already performed a redefinition check above, but for static 5532 // data members we also need to check whether there was an in-class 5533 // declaration with an initializer. 5534 const VarDecl* PrevInit = 0; 5535 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5536 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5537 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5538 return; 5539 } 5540 5541 bool IsDependent = false; 5542 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 5543 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 5544 VDecl->setInvalidDecl(); 5545 return; 5546 } 5547 5548 if (Exprs.get()[I]->isTypeDependent()) 5549 IsDependent = true; 5550 } 5551 5552 // If either the declaration has a dependent type or if any of the 5553 // expressions is type-dependent, we represent the initialization 5554 // via a ParenListExpr for later use during template instantiation. 5555 if (VDecl->getType()->isDependentType() || IsDependent) { 5556 // Let clients know that initialization was done with a direct initializer. 5557 VDecl->setCXXDirectInitializer(true); 5558 5559 // Store the initialization expressions as a ParenListExpr. 5560 unsigned NumExprs = Exprs.size(); 5561 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5562 (Expr **)Exprs.release(), 5563 NumExprs, RParenLoc)); 5564 return; 5565 } 5566 5567 // Capture the variable that is being initialized and the style of 5568 // initialization. 5569 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5570 5571 // FIXME: Poor source location information. 5572 InitializationKind Kind 5573 = InitializationKind::CreateDirect(VDecl->getLocation(), 5574 LParenLoc, RParenLoc); 5575 5576 InitializationSequence InitSeq(*this, Entity, Kind, 5577 Exprs.get(), Exprs.size()); 5578 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5579 if (Result.isInvalid()) { 5580 VDecl->setInvalidDecl(); 5581 return; 5582 } 5583 5584 CheckImplicitConversions(Result.get(), LParenLoc); 5585 5586 Result = MaybeCreateExprWithCleanups(Result); 5587 VDecl->setInit(Result.takeAs<Expr>()); 5588 VDecl->setCXXDirectInitializer(true); 5589 5590 if (!VDecl->isInvalidDecl() && 5591 !VDecl->getDeclContext()->isDependentContext() && 5592 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5593 !VDecl->getInit()->isConstantInitializer(Context, 5594 VDecl->getType()->isReferenceType())) 5595 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5596 << VDecl->getInit()->getSourceRange(); 5597 5598 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5599 FinalizeVarWithDestructor(VDecl, Record); 5600} 5601 5602/// \brief Given a constructor and the set of arguments provided for the 5603/// constructor, convert the arguments and add any required default arguments 5604/// to form a proper call to this constructor. 5605/// 5606/// \returns true if an error occurred, false otherwise. 5607bool 5608Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5609 MultiExprArg ArgsPtr, 5610 SourceLocation Loc, 5611 ASTOwningVector<Expr*> &ConvertedArgs) { 5612 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5613 unsigned NumArgs = ArgsPtr.size(); 5614 Expr **Args = (Expr **)ArgsPtr.get(); 5615 5616 const FunctionProtoType *Proto 5617 = Constructor->getType()->getAs<FunctionProtoType>(); 5618 assert(Proto && "Constructor without a prototype?"); 5619 unsigned NumArgsInProto = Proto->getNumArgs(); 5620 5621 // If too few arguments are available, we'll fill in the rest with defaults. 5622 if (NumArgs < NumArgsInProto) 5623 ConvertedArgs.reserve(NumArgsInProto); 5624 else 5625 ConvertedArgs.reserve(NumArgs); 5626 5627 VariadicCallType CallType = 5628 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5629 llvm::SmallVector<Expr *, 8> AllArgs; 5630 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5631 Proto, 0, Args, NumArgs, AllArgs, 5632 CallType); 5633 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5634 ConvertedArgs.push_back(AllArgs[i]); 5635 return Invalid; 5636} 5637 5638static inline bool 5639CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5640 const FunctionDecl *FnDecl) { 5641 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5642 if (isa<NamespaceDecl>(DC)) { 5643 return SemaRef.Diag(FnDecl->getLocation(), 5644 diag::err_operator_new_delete_declared_in_namespace) 5645 << FnDecl->getDeclName(); 5646 } 5647 5648 if (isa<TranslationUnitDecl>(DC) && 5649 FnDecl->getStorageClass() == SC_Static) { 5650 return SemaRef.Diag(FnDecl->getLocation(), 5651 diag::err_operator_new_delete_declared_static) 5652 << FnDecl->getDeclName(); 5653 } 5654 5655 return false; 5656} 5657 5658static inline bool 5659CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5660 CanQualType ExpectedResultType, 5661 CanQualType ExpectedFirstParamType, 5662 unsigned DependentParamTypeDiag, 5663 unsigned InvalidParamTypeDiag) { 5664 QualType ResultType = 5665 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5666 5667 // Check that the result type is not dependent. 5668 if (ResultType->isDependentType()) 5669 return SemaRef.Diag(FnDecl->getLocation(), 5670 diag::err_operator_new_delete_dependent_result_type) 5671 << FnDecl->getDeclName() << ExpectedResultType; 5672 5673 // Check that the result type is what we expect. 5674 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5675 return SemaRef.Diag(FnDecl->getLocation(), 5676 diag::err_operator_new_delete_invalid_result_type) 5677 << FnDecl->getDeclName() << ExpectedResultType; 5678 5679 // A function template must have at least 2 parameters. 5680 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5681 return SemaRef.Diag(FnDecl->getLocation(), 5682 diag::err_operator_new_delete_template_too_few_parameters) 5683 << FnDecl->getDeclName(); 5684 5685 // The function decl must have at least 1 parameter. 5686 if (FnDecl->getNumParams() == 0) 5687 return SemaRef.Diag(FnDecl->getLocation(), 5688 diag::err_operator_new_delete_too_few_parameters) 5689 << FnDecl->getDeclName(); 5690 5691 // Check the the first parameter type is not dependent. 5692 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5693 if (FirstParamType->isDependentType()) 5694 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5695 << FnDecl->getDeclName() << ExpectedFirstParamType; 5696 5697 // Check that the first parameter type is what we expect. 5698 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5699 ExpectedFirstParamType) 5700 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5701 << FnDecl->getDeclName() << ExpectedFirstParamType; 5702 5703 return false; 5704} 5705 5706static bool 5707CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5708 // C++ [basic.stc.dynamic.allocation]p1: 5709 // A program is ill-formed if an allocation function is declared in a 5710 // namespace scope other than global scope or declared static in global 5711 // scope. 5712 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5713 return true; 5714 5715 CanQualType SizeTy = 5716 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5717 5718 // C++ [basic.stc.dynamic.allocation]p1: 5719 // The return type shall be void*. The first parameter shall have type 5720 // std::size_t. 5721 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5722 SizeTy, 5723 diag::err_operator_new_dependent_param_type, 5724 diag::err_operator_new_param_type)) 5725 return true; 5726 5727 // C++ [basic.stc.dynamic.allocation]p1: 5728 // The first parameter shall not have an associated default argument. 5729 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5730 return SemaRef.Diag(FnDecl->getLocation(), 5731 diag::err_operator_new_default_arg) 5732 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5733 5734 return false; 5735} 5736 5737static bool 5738CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5739 // C++ [basic.stc.dynamic.deallocation]p1: 5740 // A program is ill-formed if deallocation functions are declared in a 5741 // namespace scope other than global scope or declared static in global 5742 // scope. 5743 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5744 return true; 5745 5746 // C++ [basic.stc.dynamic.deallocation]p2: 5747 // Each deallocation function shall return void and its first parameter 5748 // shall be void*. 5749 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5750 SemaRef.Context.VoidPtrTy, 5751 diag::err_operator_delete_dependent_param_type, 5752 diag::err_operator_delete_param_type)) 5753 return true; 5754 5755 return false; 5756} 5757 5758/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5759/// of this overloaded operator is well-formed. If so, returns false; 5760/// otherwise, emits appropriate diagnostics and returns true. 5761bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5762 assert(FnDecl && FnDecl->isOverloadedOperator() && 5763 "Expected an overloaded operator declaration"); 5764 5765 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5766 5767 // C++ [over.oper]p5: 5768 // The allocation and deallocation functions, operator new, 5769 // operator new[], operator delete and operator delete[], are 5770 // described completely in 3.7.3. The attributes and restrictions 5771 // found in the rest of this subclause do not apply to them unless 5772 // explicitly stated in 3.7.3. 5773 if (Op == OO_Delete || Op == OO_Array_Delete) 5774 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5775 5776 if (Op == OO_New || Op == OO_Array_New) 5777 return CheckOperatorNewDeclaration(*this, FnDecl); 5778 5779 // C++ [over.oper]p6: 5780 // An operator function shall either be a non-static member 5781 // function or be a non-member function and have at least one 5782 // parameter whose type is a class, a reference to a class, an 5783 // enumeration, or a reference to an enumeration. 5784 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5785 if (MethodDecl->isStatic()) 5786 return Diag(FnDecl->getLocation(), 5787 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5788 } else { 5789 bool ClassOrEnumParam = false; 5790 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5791 ParamEnd = FnDecl->param_end(); 5792 Param != ParamEnd; ++Param) { 5793 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5794 if (ParamType->isDependentType() || ParamType->isRecordType() || 5795 ParamType->isEnumeralType()) { 5796 ClassOrEnumParam = true; 5797 break; 5798 } 5799 } 5800 5801 if (!ClassOrEnumParam) 5802 return Diag(FnDecl->getLocation(), 5803 diag::err_operator_overload_needs_class_or_enum) 5804 << FnDecl->getDeclName(); 5805 } 5806 5807 // C++ [over.oper]p8: 5808 // An operator function cannot have default arguments (8.3.6), 5809 // except where explicitly stated below. 5810 // 5811 // Only the function-call operator allows default arguments 5812 // (C++ [over.call]p1). 5813 if (Op != OO_Call) { 5814 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5815 Param != FnDecl->param_end(); ++Param) { 5816 if ((*Param)->hasDefaultArg()) 5817 return Diag((*Param)->getLocation(), 5818 diag::err_operator_overload_default_arg) 5819 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5820 } 5821 } 5822 5823 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5824 { false, false, false } 5825#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5826 , { Unary, Binary, MemberOnly } 5827#include "clang/Basic/OperatorKinds.def" 5828 }; 5829 5830 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5831 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5832 bool MustBeMemberOperator = OperatorUses[Op][2]; 5833 5834 // C++ [over.oper]p8: 5835 // [...] Operator functions cannot have more or fewer parameters 5836 // than the number required for the corresponding operator, as 5837 // described in the rest of this subclause. 5838 unsigned NumParams = FnDecl->getNumParams() 5839 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5840 if (Op != OO_Call && 5841 ((NumParams == 1 && !CanBeUnaryOperator) || 5842 (NumParams == 2 && !CanBeBinaryOperator) || 5843 (NumParams < 1) || (NumParams > 2))) { 5844 // We have the wrong number of parameters. 5845 unsigned ErrorKind; 5846 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5847 ErrorKind = 2; // 2 -> unary or binary. 5848 } else if (CanBeUnaryOperator) { 5849 ErrorKind = 0; // 0 -> unary 5850 } else { 5851 assert(CanBeBinaryOperator && 5852 "All non-call overloaded operators are unary or binary!"); 5853 ErrorKind = 1; // 1 -> binary 5854 } 5855 5856 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5857 << FnDecl->getDeclName() << NumParams << ErrorKind; 5858 } 5859 5860 // Overloaded operators other than operator() cannot be variadic. 5861 if (Op != OO_Call && 5862 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5863 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5864 << FnDecl->getDeclName(); 5865 } 5866 5867 // Some operators must be non-static member functions. 5868 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5869 return Diag(FnDecl->getLocation(), 5870 diag::err_operator_overload_must_be_member) 5871 << FnDecl->getDeclName(); 5872 } 5873 5874 // C++ [over.inc]p1: 5875 // The user-defined function called operator++ implements the 5876 // prefix and postfix ++ operator. If this function is a member 5877 // function with no parameters, or a non-member function with one 5878 // parameter of class or enumeration type, it defines the prefix 5879 // increment operator ++ for objects of that type. If the function 5880 // is a member function with one parameter (which shall be of type 5881 // int) or a non-member function with two parameters (the second 5882 // of which shall be of type int), it defines the postfix 5883 // increment operator ++ for objects of that type. 5884 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5885 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5886 bool ParamIsInt = false; 5887 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5888 ParamIsInt = BT->getKind() == BuiltinType::Int; 5889 5890 if (!ParamIsInt) 5891 return Diag(LastParam->getLocation(), 5892 diag::err_operator_overload_post_incdec_must_be_int) 5893 << LastParam->getType() << (Op == OO_MinusMinus); 5894 } 5895 5896 return false; 5897} 5898 5899/// CheckLiteralOperatorDeclaration - Check whether the declaration 5900/// of this literal operator function is well-formed. If so, returns 5901/// false; otherwise, emits appropriate diagnostics and returns true. 5902bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5903 DeclContext *DC = FnDecl->getDeclContext(); 5904 Decl::Kind Kind = DC->getDeclKind(); 5905 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5906 Kind != Decl::LinkageSpec) { 5907 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5908 << FnDecl->getDeclName(); 5909 return true; 5910 } 5911 5912 bool Valid = false; 5913 5914 // template <char...> type operator "" name() is the only valid template 5915 // signature, and the only valid signature with no parameters. 5916 if (FnDecl->param_size() == 0) { 5917 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5918 // Must have only one template parameter 5919 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5920 if (Params->size() == 1) { 5921 NonTypeTemplateParmDecl *PmDecl = 5922 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5923 5924 // The template parameter must be a char parameter pack. 5925 // FIXME: This test will always fail because non-type parameter packs 5926 // have not been implemented. 5927 if (PmDecl && PmDecl->isTemplateParameterPack() && 5928 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5929 Valid = true; 5930 } 5931 } 5932 } else { 5933 // Check the first parameter 5934 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5935 5936 QualType T = (*Param)->getType(); 5937 5938 // unsigned long long int, long double, and any character type are allowed 5939 // as the only parameters. 5940 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5941 Context.hasSameType(T, Context.LongDoubleTy) || 5942 Context.hasSameType(T, Context.CharTy) || 5943 Context.hasSameType(T, Context.WCharTy) || 5944 Context.hasSameType(T, Context.Char16Ty) || 5945 Context.hasSameType(T, Context.Char32Ty)) { 5946 if (++Param == FnDecl->param_end()) 5947 Valid = true; 5948 goto FinishedParams; 5949 } 5950 5951 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5952 const PointerType *PT = T->getAs<PointerType>(); 5953 if (!PT) 5954 goto FinishedParams; 5955 T = PT->getPointeeType(); 5956 if (!T.isConstQualified()) 5957 goto FinishedParams; 5958 T = T.getUnqualifiedType(); 5959 5960 // Move on to the second parameter; 5961 ++Param; 5962 5963 // If there is no second parameter, the first must be a const char * 5964 if (Param == FnDecl->param_end()) { 5965 if (Context.hasSameType(T, Context.CharTy)) 5966 Valid = true; 5967 goto FinishedParams; 5968 } 5969 5970 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5971 // are allowed as the first parameter to a two-parameter function 5972 if (!(Context.hasSameType(T, Context.CharTy) || 5973 Context.hasSameType(T, Context.WCharTy) || 5974 Context.hasSameType(T, Context.Char16Ty) || 5975 Context.hasSameType(T, Context.Char32Ty))) 5976 goto FinishedParams; 5977 5978 // The second and final parameter must be an std::size_t 5979 T = (*Param)->getType().getUnqualifiedType(); 5980 if (Context.hasSameType(T, Context.getSizeType()) && 5981 ++Param == FnDecl->param_end()) 5982 Valid = true; 5983 } 5984 5985 // FIXME: This diagnostic is absolutely terrible. 5986FinishedParams: 5987 if (!Valid) { 5988 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5989 << FnDecl->getDeclName(); 5990 return true; 5991 } 5992 5993 return false; 5994} 5995 5996/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5997/// linkage specification, including the language and (if present) 5998/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5999/// the location of the language string literal, which is provided 6000/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6001/// the '{' brace. Otherwise, this linkage specification does not 6002/// have any braces. 6003Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6004 SourceLocation LangLoc, 6005 llvm::StringRef Lang, 6006 SourceLocation LBraceLoc) { 6007 LinkageSpecDecl::LanguageIDs Language; 6008 if (Lang == "\"C\"") 6009 Language = LinkageSpecDecl::lang_c; 6010 else if (Lang == "\"C++\"") 6011 Language = LinkageSpecDecl::lang_cxx; 6012 else { 6013 Diag(LangLoc, diag::err_bad_language); 6014 return 0; 6015 } 6016 6017 // FIXME: Add all the various semantics of linkage specifications 6018 6019 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6020 LangLoc, Language, 6021 LBraceLoc.isValid()); 6022 CurContext->addDecl(D); 6023 PushDeclContext(S, D); 6024 return D; 6025} 6026 6027/// ActOnFinishLinkageSpecification - Complete the definition of 6028/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6029/// valid, it's the position of the closing '}' brace in a linkage 6030/// specification that uses braces. 6031Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6032 Decl *LinkageSpec, 6033 SourceLocation RBraceLoc) { 6034 if (LinkageSpec) 6035 PopDeclContext(); 6036 return LinkageSpec; 6037} 6038 6039/// \brief Perform semantic analysis for the variable declaration that 6040/// occurs within a C++ catch clause, returning the newly-created 6041/// variable. 6042VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6043 TypeSourceInfo *TInfo, 6044 IdentifierInfo *Name, 6045 SourceLocation Loc) { 6046 bool Invalid = false; 6047 QualType ExDeclType = TInfo->getType(); 6048 6049 // Arrays and functions decay. 6050 if (ExDeclType->isArrayType()) 6051 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6052 else if (ExDeclType->isFunctionType()) 6053 ExDeclType = Context.getPointerType(ExDeclType); 6054 6055 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6056 // The exception-declaration shall not denote a pointer or reference to an 6057 // incomplete type, other than [cv] void*. 6058 // N2844 forbids rvalue references. 6059 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6060 Diag(Loc, diag::err_catch_rvalue_ref); 6061 Invalid = true; 6062 } 6063 6064 // GCC allows catching pointers and references to incomplete types 6065 // as an extension; so do we, but we warn by default. 6066 6067 QualType BaseType = ExDeclType; 6068 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6069 unsigned DK = diag::err_catch_incomplete; 6070 bool IncompleteCatchIsInvalid = true; 6071 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6072 BaseType = Ptr->getPointeeType(); 6073 Mode = 1; 6074 DK = diag::ext_catch_incomplete_ptr; 6075 IncompleteCatchIsInvalid = false; 6076 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6077 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6078 BaseType = Ref->getPointeeType(); 6079 Mode = 2; 6080 DK = diag::ext_catch_incomplete_ref; 6081 IncompleteCatchIsInvalid = false; 6082 } 6083 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6084 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6085 IncompleteCatchIsInvalid) 6086 Invalid = true; 6087 6088 if (!Invalid && !ExDeclType->isDependentType() && 6089 RequireNonAbstractType(Loc, ExDeclType, 6090 diag::err_abstract_type_in_decl, 6091 AbstractVariableType)) 6092 Invalid = true; 6093 6094 // Only the non-fragile NeXT runtime currently supports C++ catches 6095 // of ObjC types, and no runtime supports catching ObjC types by value. 6096 if (!Invalid && getLangOptions().ObjC1) { 6097 QualType T = ExDeclType; 6098 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6099 T = RT->getPointeeType(); 6100 6101 if (T->isObjCObjectType()) { 6102 Diag(Loc, diag::err_objc_object_catch); 6103 Invalid = true; 6104 } else if (T->isObjCObjectPointerType()) { 6105 if (!getLangOptions().NeXTRuntime) { 6106 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6107 Invalid = true; 6108 } else if (!getLangOptions().ObjCNonFragileABI) { 6109 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6110 Invalid = true; 6111 } 6112 } 6113 } 6114 6115 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6116 Name, ExDeclType, TInfo, SC_None, 6117 SC_None); 6118 ExDecl->setExceptionVariable(true); 6119 6120 if (!Invalid) { 6121 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6122 // C++ [except.handle]p16: 6123 // The object declared in an exception-declaration or, if the 6124 // exception-declaration does not specify a name, a temporary (12.2) is 6125 // copy-initialized (8.5) from the exception object. [...] 6126 // The object is destroyed when the handler exits, after the destruction 6127 // of any automatic objects initialized within the handler. 6128 // 6129 // We just pretend to initialize the object with itself, then make sure 6130 // it can be destroyed later. 6131 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6132 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6133 Loc, ExDeclType, VK_LValue, 0); 6134 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6135 SourceLocation()); 6136 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6137 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6138 MultiExprArg(*this, &ExDeclRef, 1)); 6139 if (Result.isInvalid()) 6140 Invalid = true; 6141 else 6142 FinalizeVarWithDestructor(ExDecl, RecordTy); 6143 } 6144 } 6145 6146 if (Invalid) 6147 ExDecl->setInvalidDecl(); 6148 6149 return ExDecl; 6150} 6151 6152/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6153/// handler. 6154Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6155 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6156 bool Invalid = D.isInvalidType(); 6157 6158 // Check for unexpanded parameter packs. 6159 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6160 UPPC_ExceptionType)) { 6161 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6162 D.getIdentifierLoc()); 6163 Invalid = true; 6164 } 6165 6166 QualType ExDeclType = TInfo->getType(); 6167 6168 IdentifierInfo *II = D.getIdentifier(); 6169 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6170 LookupOrdinaryName, 6171 ForRedeclaration)) { 6172 // The scope should be freshly made just for us. There is just no way 6173 // it contains any previous declaration. 6174 assert(!S->isDeclScope(PrevDecl)); 6175 if (PrevDecl->isTemplateParameter()) { 6176 // Maybe we will complain about the shadowed template parameter. 6177 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6178 } 6179 } 6180 6181 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6182 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6183 << D.getCXXScopeSpec().getRange(); 6184 Invalid = true; 6185 } 6186 6187 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6188 D.getIdentifier(), 6189 D.getIdentifierLoc()); 6190 6191 if (Invalid) 6192 ExDecl->setInvalidDecl(); 6193 6194 // Add the exception declaration into this scope. 6195 if (II) 6196 PushOnScopeChains(ExDecl, S); 6197 else 6198 CurContext->addDecl(ExDecl); 6199 6200 ProcessDeclAttributes(S, ExDecl, D); 6201 return ExDecl; 6202} 6203 6204Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6205 Expr *AssertExpr, 6206 Expr *AssertMessageExpr_) { 6207 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6208 6209 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6210 llvm::APSInt Value(32); 6211 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6212 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6213 AssertExpr->getSourceRange(); 6214 return 0; 6215 } 6216 6217 if (Value == 0) { 6218 Diag(AssertLoc, diag::err_static_assert_failed) 6219 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6220 } 6221 } 6222 6223 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6224 return 0; 6225 6226 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6227 AssertExpr, AssertMessage); 6228 6229 CurContext->addDecl(Decl); 6230 return Decl; 6231} 6232 6233/// \brief Perform semantic analysis of the given friend type declaration. 6234/// 6235/// \returns A friend declaration that. 6236FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6237 TypeSourceInfo *TSInfo) { 6238 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6239 6240 QualType T = TSInfo->getType(); 6241 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6242 6243 if (!getLangOptions().CPlusPlus0x) { 6244 // C++03 [class.friend]p2: 6245 // An elaborated-type-specifier shall be used in a friend declaration 6246 // for a class.* 6247 // 6248 // * The class-key of the elaborated-type-specifier is required. 6249 if (!ActiveTemplateInstantiations.empty()) { 6250 // Do not complain about the form of friend template types during 6251 // template instantiation; we will already have complained when the 6252 // template was declared. 6253 } else if (!T->isElaboratedTypeSpecifier()) { 6254 // If we evaluated the type to a record type, suggest putting 6255 // a tag in front. 6256 if (const RecordType *RT = T->getAs<RecordType>()) { 6257 RecordDecl *RD = RT->getDecl(); 6258 6259 std::string InsertionText = std::string(" ") + RD->getKindName(); 6260 6261 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6262 << (unsigned) RD->getTagKind() 6263 << T 6264 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6265 InsertionText); 6266 } else { 6267 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6268 << T 6269 << SourceRange(FriendLoc, TypeRange.getEnd()); 6270 } 6271 } else if (T->getAs<EnumType>()) { 6272 Diag(FriendLoc, diag::ext_enum_friend) 6273 << T 6274 << SourceRange(FriendLoc, TypeRange.getEnd()); 6275 } 6276 } 6277 6278 // C++0x [class.friend]p3: 6279 // If the type specifier in a friend declaration designates a (possibly 6280 // cv-qualified) class type, that class is declared as a friend; otherwise, 6281 // the friend declaration is ignored. 6282 6283 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6284 // in [class.friend]p3 that we do not implement. 6285 6286 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6287} 6288 6289/// Handle a friend tag declaration where the scope specifier was 6290/// templated. 6291Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6292 unsigned TagSpec, SourceLocation TagLoc, 6293 CXXScopeSpec &SS, 6294 IdentifierInfo *Name, SourceLocation NameLoc, 6295 AttributeList *Attr, 6296 MultiTemplateParamsArg TempParamLists) { 6297 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6298 6299 bool isExplicitSpecialization = false; 6300 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6301 bool Invalid = false; 6302 6303 if (TemplateParameterList *TemplateParams 6304 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6305 TempParamLists.get(), 6306 TempParamLists.size(), 6307 /*friend*/ true, 6308 isExplicitSpecialization, 6309 Invalid)) { 6310 --NumMatchedTemplateParamLists; 6311 6312 if (TemplateParams->size() > 0) { 6313 // This is a declaration of a class template. 6314 if (Invalid) 6315 return 0; 6316 6317 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6318 SS, Name, NameLoc, Attr, 6319 TemplateParams, AS_public).take(); 6320 } else { 6321 // The "template<>" header is extraneous. 6322 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6323 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6324 isExplicitSpecialization = true; 6325 } 6326 } 6327 6328 if (Invalid) return 0; 6329 6330 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6331 6332 bool isAllExplicitSpecializations = true; 6333 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6334 if (TempParamLists.get()[I]->size()) { 6335 isAllExplicitSpecializations = false; 6336 break; 6337 } 6338 } 6339 6340 // FIXME: don't ignore attributes. 6341 6342 // If it's explicit specializations all the way down, just forget 6343 // about the template header and build an appropriate non-templated 6344 // friend. TODO: for source fidelity, remember the headers. 6345 if (isAllExplicitSpecializations) { 6346 ElaboratedTypeKeyword Keyword 6347 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6348 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6349 TagLoc, SS.getRange(), NameLoc); 6350 if (T.isNull()) 6351 return 0; 6352 6353 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6354 if (isa<DependentNameType>(T)) { 6355 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6356 TL.setKeywordLoc(TagLoc); 6357 TL.setQualifierRange(SS.getRange()); 6358 TL.setNameLoc(NameLoc); 6359 } else { 6360 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6361 TL.setKeywordLoc(TagLoc); 6362 TL.setQualifierRange(SS.getRange()); 6363 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6364 } 6365 6366 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6367 TSI, FriendLoc); 6368 Friend->setAccess(AS_public); 6369 CurContext->addDecl(Friend); 6370 return Friend; 6371 } 6372 6373 // Handle the case of a templated-scope friend class. e.g. 6374 // template <class T> class A<T>::B; 6375 // FIXME: we don't support these right now. 6376 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6377 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6378 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6379 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6380 TL.setKeywordLoc(TagLoc); 6381 TL.setQualifierRange(SS.getRange()); 6382 TL.setNameLoc(NameLoc); 6383 6384 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6385 TSI, FriendLoc); 6386 Friend->setAccess(AS_public); 6387 Friend->setUnsupportedFriend(true); 6388 CurContext->addDecl(Friend); 6389 return Friend; 6390} 6391 6392 6393/// Handle a friend type declaration. This works in tandem with 6394/// ActOnTag. 6395/// 6396/// Notes on friend class templates: 6397/// 6398/// We generally treat friend class declarations as if they were 6399/// declaring a class. So, for example, the elaborated type specifier 6400/// in a friend declaration is required to obey the restrictions of a 6401/// class-head (i.e. no typedefs in the scope chain), template 6402/// parameters are required to match up with simple template-ids, &c. 6403/// However, unlike when declaring a template specialization, it's 6404/// okay to refer to a template specialization without an empty 6405/// template parameter declaration, e.g. 6406/// friend class A<T>::B<unsigned>; 6407/// We permit this as a special case; if there are any template 6408/// parameters present at all, require proper matching, i.e. 6409/// template <> template <class T> friend class A<int>::B; 6410Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6411 MultiTemplateParamsArg TempParams) { 6412 SourceLocation Loc = DS.getSourceRange().getBegin(); 6413 6414 assert(DS.isFriendSpecified()); 6415 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6416 6417 // Try to convert the decl specifier to a type. This works for 6418 // friend templates because ActOnTag never produces a ClassTemplateDecl 6419 // for a TUK_Friend. 6420 Declarator TheDeclarator(DS, Declarator::MemberContext); 6421 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6422 QualType T = TSI->getType(); 6423 if (TheDeclarator.isInvalidType()) 6424 return 0; 6425 6426 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 6427 return 0; 6428 6429 // This is definitely an error in C++98. It's probably meant to 6430 // be forbidden in C++0x, too, but the specification is just 6431 // poorly written. 6432 // 6433 // The problem is with declarations like the following: 6434 // template <T> friend A<T>::foo; 6435 // where deciding whether a class C is a friend or not now hinges 6436 // on whether there exists an instantiation of A that causes 6437 // 'foo' to equal C. There are restrictions on class-heads 6438 // (which we declare (by fiat) elaborated friend declarations to 6439 // be) that makes this tractable. 6440 // 6441 // FIXME: handle "template <> friend class A<T>;", which 6442 // is possibly well-formed? Who even knows? 6443 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6444 Diag(Loc, diag::err_tagless_friend_type_template) 6445 << DS.getSourceRange(); 6446 return 0; 6447 } 6448 6449 // C++98 [class.friend]p1: A friend of a class is a function 6450 // or class that is not a member of the class . . . 6451 // This is fixed in DR77, which just barely didn't make the C++03 6452 // deadline. It's also a very silly restriction that seriously 6453 // affects inner classes and which nobody else seems to implement; 6454 // thus we never diagnose it, not even in -pedantic. 6455 // 6456 // But note that we could warn about it: it's always useless to 6457 // friend one of your own members (it's not, however, worthless to 6458 // friend a member of an arbitrary specialization of your template). 6459 6460 Decl *D; 6461 if (unsigned NumTempParamLists = TempParams.size()) 6462 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6463 NumTempParamLists, 6464 TempParams.release(), 6465 TSI, 6466 DS.getFriendSpecLoc()); 6467 else 6468 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6469 6470 if (!D) 6471 return 0; 6472 6473 D->setAccess(AS_public); 6474 CurContext->addDecl(D); 6475 6476 return D; 6477} 6478 6479Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6480 MultiTemplateParamsArg TemplateParams) { 6481 const DeclSpec &DS = D.getDeclSpec(); 6482 6483 assert(DS.isFriendSpecified()); 6484 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6485 6486 SourceLocation Loc = D.getIdentifierLoc(); 6487 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6488 QualType T = TInfo->getType(); 6489 6490 // C++ [class.friend]p1 6491 // A friend of a class is a function or class.... 6492 // Note that this sees through typedefs, which is intended. 6493 // It *doesn't* see through dependent types, which is correct 6494 // according to [temp.arg.type]p3: 6495 // If a declaration acquires a function type through a 6496 // type dependent on a template-parameter and this causes 6497 // a declaration that does not use the syntactic form of a 6498 // function declarator to have a function type, the program 6499 // is ill-formed. 6500 if (!T->isFunctionType()) { 6501 Diag(Loc, diag::err_unexpected_friend); 6502 6503 // It might be worthwhile to try to recover by creating an 6504 // appropriate declaration. 6505 return 0; 6506 } 6507 6508 // C++ [namespace.memdef]p3 6509 // - If a friend declaration in a non-local class first declares a 6510 // class or function, the friend class or function is a member 6511 // of the innermost enclosing namespace. 6512 // - The name of the friend is not found by simple name lookup 6513 // until a matching declaration is provided in that namespace 6514 // scope (either before or after the class declaration granting 6515 // friendship). 6516 // - If a friend function is called, its name may be found by the 6517 // name lookup that considers functions from namespaces and 6518 // classes associated with the types of the function arguments. 6519 // - When looking for a prior declaration of a class or a function 6520 // declared as a friend, scopes outside the innermost enclosing 6521 // namespace scope are not considered. 6522 6523 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6524 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6525 DeclarationName Name = NameInfo.getName(); 6526 assert(Name); 6527 6528 // Check for unexpanded parameter packs. 6529 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 6530 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 6531 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 6532 return 0; 6533 6534 // The context we found the declaration in, or in which we should 6535 // create the declaration. 6536 DeclContext *DC; 6537 Scope *DCScope = S; 6538 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6539 ForRedeclaration); 6540 6541 // FIXME: there are different rules in local classes 6542 6543 // There are four cases here. 6544 // - There's no scope specifier, in which case we just go to the 6545 // appropriate scope and look for a function or function template 6546 // there as appropriate. 6547 // Recover from invalid scope qualifiers as if they just weren't there. 6548 if (SS.isInvalid() || !SS.isSet()) { 6549 // C++0x [namespace.memdef]p3: 6550 // If the name in a friend declaration is neither qualified nor 6551 // a template-id and the declaration is a function or an 6552 // elaborated-type-specifier, the lookup to determine whether 6553 // the entity has been previously declared shall not consider 6554 // any scopes outside the innermost enclosing namespace. 6555 // C++0x [class.friend]p11: 6556 // If a friend declaration appears in a local class and the name 6557 // specified is an unqualified name, a prior declaration is 6558 // looked up without considering scopes that are outside the 6559 // innermost enclosing non-class scope. For a friend function 6560 // declaration, if there is no prior declaration, the program is 6561 // ill-formed. 6562 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6563 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 6564 6565 // Find the appropriate context according to the above. 6566 DC = CurContext; 6567 while (true) { 6568 // Skip class contexts. If someone can cite chapter and verse 6569 // for this behavior, that would be nice --- it's what GCC and 6570 // EDG do, and it seems like a reasonable intent, but the spec 6571 // really only says that checks for unqualified existing 6572 // declarations should stop at the nearest enclosing namespace, 6573 // not that they should only consider the nearest enclosing 6574 // namespace. 6575 while (DC->isRecord()) 6576 DC = DC->getParent(); 6577 6578 LookupQualifiedName(Previous, DC); 6579 6580 // TODO: decide what we think about using declarations. 6581 if (isLocal || !Previous.empty()) 6582 break; 6583 6584 if (isTemplateId) { 6585 if (isa<TranslationUnitDecl>(DC)) break; 6586 } else { 6587 if (DC->isFileContext()) break; 6588 } 6589 DC = DC->getParent(); 6590 } 6591 6592 // C++ [class.friend]p1: A friend of a class is a function or 6593 // class that is not a member of the class . . . 6594 // C++0x changes this for both friend types and functions. 6595 // Most C++ 98 compilers do seem to give an error here, so 6596 // we do, too. 6597 if (!Previous.empty() && DC->Equals(CurContext) 6598 && !getLangOptions().CPlusPlus0x) 6599 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6600 6601 DCScope = getScopeForDeclContext(S, DC); 6602 6603 // - There's a non-dependent scope specifier, in which case we 6604 // compute it and do a previous lookup there for a function 6605 // or function template. 6606 } else if (!SS.getScopeRep()->isDependent()) { 6607 DC = computeDeclContext(SS); 6608 if (!DC) return 0; 6609 6610 if (RequireCompleteDeclContext(SS, DC)) return 0; 6611 6612 LookupQualifiedName(Previous, DC); 6613 6614 // Ignore things found implicitly in the wrong scope. 6615 // TODO: better diagnostics for this case. Suggesting the right 6616 // qualified scope would be nice... 6617 LookupResult::Filter F = Previous.makeFilter(); 6618 while (F.hasNext()) { 6619 NamedDecl *D = F.next(); 6620 if (!DC->InEnclosingNamespaceSetOf( 6621 D->getDeclContext()->getRedeclContext())) 6622 F.erase(); 6623 } 6624 F.done(); 6625 6626 if (Previous.empty()) { 6627 D.setInvalidType(); 6628 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6629 return 0; 6630 } 6631 6632 // C++ [class.friend]p1: A friend of a class is a function or 6633 // class that is not a member of the class . . . 6634 if (DC->Equals(CurContext)) 6635 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6636 6637 // - There's a scope specifier that does not match any template 6638 // parameter lists, in which case we use some arbitrary context, 6639 // create a method or method template, and wait for instantiation. 6640 // - There's a scope specifier that does match some template 6641 // parameter lists, which we don't handle right now. 6642 } else { 6643 DC = CurContext; 6644 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6645 } 6646 6647 if (!DC->isRecord()) { 6648 // This implies that it has to be an operator or function. 6649 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6650 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6651 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6652 Diag(Loc, diag::err_introducing_special_friend) << 6653 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6654 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6655 return 0; 6656 } 6657 } 6658 6659 bool Redeclaration = false; 6660 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6661 move(TemplateParams), 6662 IsDefinition, 6663 Redeclaration); 6664 if (!ND) return 0; 6665 6666 assert(ND->getDeclContext() == DC); 6667 assert(ND->getLexicalDeclContext() == CurContext); 6668 6669 // Add the function declaration to the appropriate lookup tables, 6670 // adjusting the redeclarations list as necessary. We don't 6671 // want to do this yet if the friending class is dependent. 6672 // 6673 // Also update the scope-based lookup if the target context's 6674 // lookup context is in lexical scope. 6675 if (!CurContext->isDependentContext()) { 6676 DC = DC->getRedeclContext(); 6677 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6678 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6679 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6680 } 6681 6682 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6683 D.getIdentifierLoc(), ND, 6684 DS.getFriendSpecLoc()); 6685 FrD->setAccess(AS_public); 6686 CurContext->addDecl(FrD); 6687 6688 if (ND->isInvalidDecl()) 6689 FrD->setInvalidDecl(); 6690 else { 6691 FunctionDecl *FD; 6692 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 6693 FD = FTD->getTemplatedDecl(); 6694 else 6695 FD = cast<FunctionDecl>(ND); 6696 6697 // Mark templated-scope function declarations as unsupported. 6698 if (FD->getNumTemplateParameterLists()) 6699 FrD->setUnsupportedFriend(true); 6700 } 6701 6702 return ND; 6703} 6704 6705void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6706 AdjustDeclIfTemplate(Dcl); 6707 6708 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6709 if (!Fn) { 6710 Diag(DelLoc, diag::err_deleted_non_function); 6711 return; 6712 } 6713 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6714 Diag(DelLoc, diag::err_deleted_decl_not_first); 6715 Diag(Prev->getLocation(), diag::note_previous_declaration); 6716 // If the declaration wasn't the first, we delete the function anyway for 6717 // recovery. 6718 } 6719 Fn->setDeleted(); 6720} 6721 6722static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6723 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6724 ++CI) { 6725 Stmt *SubStmt = *CI; 6726 if (!SubStmt) 6727 continue; 6728 if (isa<ReturnStmt>(SubStmt)) 6729 Self.Diag(SubStmt->getSourceRange().getBegin(), 6730 diag::err_return_in_constructor_handler); 6731 if (!isa<Expr>(SubStmt)) 6732 SearchForReturnInStmt(Self, SubStmt); 6733 } 6734} 6735 6736void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6737 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6738 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6739 SearchForReturnInStmt(*this, Handler); 6740 } 6741} 6742 6743bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6744 const CXXMethodDecl *Old) { 6745 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6746 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6747 6748 if (Context.hasSameType(NewTy, OldTy) || 6749 NewTy->isDependentType() || OldTy->isDependentType()) 6750 return false; 6751 6752 // Check if the return types are covariant 6753 QualType NewClassTy, OldClassTy; 6754 6755 /// Both types must be pointers or references to classes. 6756 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6757 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6758 NewClassTy = NewPT->getPointeeType(); 6759 OldClassTy = OldPT->getPointeeType(); 6760 } 6761 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6762 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6763 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6764 NewClassTy = NewRT->getPointeeType(); 6765 OldClassTy = OldRT->getPointeeType(); 6766 } 6767 } 6768 } 6769 6770 // The return types aren't either both pointers or references to a class type. 6771 if (NewClassTy.isNull()) { 6772 Diag(New->getLocation(), 6773 diag::err_different_return_type_for_overriding_virtual_function) 6774 << New->getDeclName() << NewTy << OldTy; 6775 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6776 6777 return true; 6778 } 6779 6780 // C++ [class.virtual]p6: 6781 // If the return type of D::f differs from the return type of B::f, the 6782 // class type in the return type of D::f shall be complete at the point of 6783 // declaration of D::f or shall be the class type D. 6784 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6785 if (!RT->isBeingDefined() && 6786 RequireCompleteType(New->getLocation(), NewClassTy, 6787 PDiag(diag::err_covariant_return_incomplete) 6788 << New->getDeclName())) 6789 return true; 6790 } 6791 6792 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6793 // Check if the new class derives from the old class. 6794 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6795 Diag(New->getLocation(), 6796 diag::err_covariant_return_not_derived) 6797 << New->getDeclName() << NewTy << OldTy; 6798 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6799 return true; 6800 } 6801 6802 // Check if we the conversion from derived to base is valid. 6803 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6804 diag::err_covariant_return_inaccessible_base, 6805 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6806 // FIXME: Should this point to the return type? 6807 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6808 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6809 return true; 6810 } 6811 } 6812 6813 // The qualifiers of the return types must be the same. 6814 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6815 Diag(New->getLocation(), 6816 diag::err_covariant_return_type_different_qualifications) 6817 << New->getDeclName() << NewTy << OldTy; 6818 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6819 return true; 6820 }; 6821 6822 6823 // The new class type must have the same or less qualifiers as the old type. 6824 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6825 Diag(New->getLocation(), 6826 diag::err_covariant_return_type_class_type_more_qualified) 6827 << New->getDeclName() << NewTy << OldTy; 6828 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6829 return true; 6830 }; 6831 6832 return false; 6833} 6834 6835bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6836 const CXXMethodDecl *Old) 6837{ 6838 if (Old->hasAttr<FinalAttr>()) { 6839 Diag(New->getLocation(), diag::err_final_function_overridden) 6840 << New->getDeclName(); 6841 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6842 return true; 6843 } 6844 6845 return false; 6846} 6847 6848/// \brief Mark the given method pure. 6849/// 6850/// \param Method the method to be marked pure. 6851/// 6852/// \param InitRange the source range that covers the "0" initializer. 6853bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6854 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6855 Method->setPure(); 6856 return false; 6857 } 6858 6859 if (!Method->isInvalidDecl()) 6860 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6861 << Method->getDeclName() << InitRange; 6862 return true; 6863} 6864 6865/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6866/// an initializer for the out-of-line declaration 'Dcl'. The scope 6867/// is a fresh scope pushed for just this purpose. 6868/// 6869/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6870/// static data member of class X, names should be looked up in the scope of 6871/// class X. 6872void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6873 // If there is no declaration, there was an error parsing it. 6874 if (D == 0) return; 6875 6876 // We should only get called for declarations with scope specifiers, like: 6877 // int foo::bar; 6878 assert(D->isOutOfLine()); 6879 EnterDeclaratorContext(S, D->getDeclContext()); 6880} 6881 6882/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6883/// initializer for the out-of-line declaration 'D'. 6884void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6885 // If there is no declaration, there was an error parsing it. 6886 if (D == 0) return; 6887 6888 assert(D->isOutOfLine()); 6889 ExitDeclaratorContext(S); 6890} 6891 6892/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6893/// C++ if/switch/while/for statement. 6894/// e.g: "if (int x = f()) {...}" 6895DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6896 // C++ 6.4p2: 6897 // The declarator shall not specify a function or an array. 6898 // The type-specifier-seq shall not contain typedef and shall not declare a 6899 // new class or enumeration. 6900 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6901 "Parser allowed 'typedef' as storage class of condition decl."); 6902 6903 TagDecl *OwnedTag = 0; 6904 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6905 QualType Ty = TInfo->getType(); 6906 6907 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6908 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6909 // would be created and CXXConditionDeclExpr wants a VarDecl. 6910 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6911 << D.getSourceRange(); 6912 return DeclResult(); 6913 } else if (OwnedTag && OwnedTag->isDefinition()) { 6914 // The type-specifier-seq shall not declare a new class or enumeration. 6915 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6916 } 6917 6918 Decl *Dcl = ActOnDeclarator(S, D); 6919 if (!Dcl) 6920 return DeclResult(); 6921 6922 return Dcl; 6923} 6924 6925void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6926 bool DefinitionRequired) { 6927 // Ignore any vtable uses in unevaluated operands or for classes that do 6928 // not have a vtable. 6929 if (!Class->isDynamicClass() || Class->isDependentContext() || 6930 CurContext->isDependentContext() || 6931 ExprEvalContexts.back().Context == Unevaluated) 6932 return; 6933 6934 // Try to insert this class into the map. 6935 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6936 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6937 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6938 if (!Pos.second) { 6939 // If we already had an entry, check to see if we are promoting this vtable 6940 // to required a definition. If so, we need to reappend to the VTableUses 6941 // list, since we may have already processed the first entry. 6942 if (DefinitionRequired && !Pos.first->second) { 6943 Pos.first->second = true; 6944 } else { 6945 // Otherwise, we can early exit. 6946 return; 6947 } 6948 } 6949 6950 // Local classes need to have their virtual members marked 6951 // immediately. For all other classes, we mark their virtual members 6952 // at the end of the translation unit. 6953 if (Class->isLocalClass()) 6954 MarkVirtualMembersReferenced(Loc, Class); 6955 else 6956 VTableUses.push_back(std::make_pair(Class, Loc)); 6957} 6958 6959bool Sema::DefineUsedVTables() { 6960 if (VTableUses.empty()) 6961 return false; 6962 6963 // Note: The VTableUses vector could grow as a result of marking 6964 // the members of a class as "used", so we check the size each 6965 // time through the loop and prefer indices (with are stable) to 6966 // iterators (which are not). 6967 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6968 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6969 if (!Class) 6970 continue; 6971 6972 SourceLocation Loc = VTableUses[I].second; 6973 6974 // If this class has a key function, but that key function is 6975 // defined in another translation unit, we don't need to emit the 6976 // vtable even though we're using it. 6977 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6978 if (KeyFunction && !KeyFunction->hasBody()) { 6979 switch (KeyFunction->getTemplateSpecializationKind()) { 6980 case TSK_Undeclared: 6981 case TSK_ExplicitSpecialization: 6982 case TSK_ExplicitInstantiationDeclaration: 6983 // The key function is in another translation unit. 6984 continue; 6985 6986 case TSK_ExplicitInstantiationDefinition: 6987 case TSK_ImplicitInstantiation: 6988 // We will be instantiating the key function. 6989 break; 6990 } 6991 } else if (!KeyFunction) { 6992 // If we have a class with no key function that is the subject 6993 // of an explicit instantiation declaration, suppress the 6994 // vtable; it will live with the explicit instantiation 6995 // definition. 6996 bool IsExplicitInstantiationDeclaration 6997 = Class->getTemplateSpecializationKind() 6998 == TSK_ExplicitInstantiationDeclaration; 6999 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7000 REnd = Class->redecls_end(); 7001 R != REnd; ++R) { 7002 TemplateSpecializationKind TSK 7003 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7004 if (TSK == TSK_ExplicitInstantiationDeclaration) 7005 IsExplicitInstantiationDeclaration = true; 7006 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7007 IsExplicitInstantiationDeclaration = false; 7008 break; 7009 } 7010 } 7011 7012 if (IsExplicitInstantiationDeclaration) 7013 continue; 7014 } 7015 7016 // Mark all of the virtual members of this class as referenced, so 7017 // that we can build a vtable. Then, tell the AST consumer that a 7018 // vtable for this class is required. 7019 MarkVirtualMembersReferenced(Loc, Class); 7020 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7021 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7022 7023 // Optionally warn if we're emitting a weak vtable. 7024 if (Class->getLinkage() == ExternalLinkage && 7025 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7026 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7027 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7028 } 7029 } 7030 VTableUses.clear(); 7031 7032 return true; 7033} 7034 7035void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7036 const CXXRecordDecl *RD) { 7037 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7038 e = RD->method_end(); i != e; ++i) { 7039 CXXMethodDecl *MD = *i; 7040 7041 // C++ [basic.def.odr]p2: 7042 // [...] A virtual member function is used if it is not pure. [...] 7043 if (MD->isVirtual() && !MD->isPure()) 7044 MarkDeclarationReferenced(Loc, MD); 7045 } 7046 7047 // Only classes that have virtual bases need a VTT. 7048 if (RD->getNumVBases() == 0) 7049 return; 7050 7051 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7052 e = RD->bases_end(); i != e; ++i) { 7053 const CXXRecordDecl *Base = 7054 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7055 if (Base->getNumVBases() == 0) 7056 continue; 7057 MarkVirtualMembersReferenced(Loc, Base); 7058 } 7059} 7060 7061/// SetIvarInitializers - This routine builds initialization ASTs for the 7062/// Objective-C implementation whose ivars need be initialized. 7063void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7064 if (!getLangOptions().CPlusPlus) 7065 return; 7066 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7067 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7068 CollectIvarsToConstructOrDestruct(OID, ivars); 7069 if (ivars.empty()) 7070 return; 7071 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 7072 for (unsigned i = 0; i < ivars.size(); i++) { 7073 FieldDecl *Field = ivars[i]; 7074 if (Field->isInvalidDecl()) 7075 continue; 7076 7077 CXXBaseOrMemberInitializer *Member; 7078 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7079 InitializationKind InitKind = 7080 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7081 7082 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7083 ExprResult MemberInit = 7084 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7085 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7086 // Note, MemberInit could actually come back empty if no initialization 7087 // is required (e.g., because it would call a trivial default constructor) 7088 if (!MemberInit.get() || MemberInit.isInvalid()) 7089 continue; 7090 7091 Member = 7092 new (Context) CXXBaseOrMemberInitializer(Context, 7093 Field, SourceLocation(), 7094 SourceLocation(), 7095 MemberInit.takeAs<Expr>(), 7096 SourceLocation()); 7097 AllToInit.push_back(Member); 7098 7099 // Be sure that the destructor is accessible and is marked as referenced. 7100 if (const RecordType *RecordTy 7101 = Context.getBaseElementType(Field->getType()) 7102 ->getAs<RecordType>()) { 7103 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7104 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7105 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7106 CheckDestructorAccess(Field->getLocation(), Destructor, 7107 PDiag(diag::err_access_dtor_ivar) 7108 << Context.getBaseElementType(Field->getType())); 7109 } 7110 } 7111 } 7112 ObjCImplementation->setIvarInitializers(Context, 7113 AllToInit.data(), AllToInit.size()); 7114 } 7115} 7116