SemaDeclCXX.cpp revision 7252f5110de3163a465aa50a2114c1fef9e848e8
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 "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 if (CheckEquivalentExceptionSpec( 262 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 263 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 264 Invalid = true; 265 } 266 267 return Invalid; 268} 269 270/// CheckCXXDefaultArguments - Verify that the default arguments for a 271/// function declaration are well-formed according to C++ 272/// [dcl.fct.default]. 273void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 274 unsigned NumParams = FD->getNumParams(); 275 unsigned p; 276 277 // Find first parameter with a default argument 278 for (p = 0; p < NumParams; ++p) { 279 ParmVarDecl *Param = FD->getParamDecl(p); 280 if (Param->getDefaultArg()) 281 break; 282 } 283 284 // C++ [dcl.fct.default]p4: 285 // In a given function declaration, all parameters 286 // subsequent to a parameter with a default argument shall 287 // have default arguments supplied in this or previous 288 // declarations. A default argument shall not be redefined 289 // by a later declaration (not even to the same value). 290 unsigned LastMissingDefaultArg = 0; 291 for(; p < NumParams; ++p) { 292 ParmVarDecl *Param = FD->getParamDecl(p); 293 if (!Param->getDefaultArg()) { 294 if (Param->isInvalidDecl()) 295 /* We already complained about this parameter. */; 296 else if (Param->getIdentifier()) 297 Diag(Param->getLocation(), 298 diag::err_param_default_argument_missing_name) 299 << Param->getIdentifier(); 300 else 301 Diag(Param->getLocation(), 302 diag::err_param_default_argument_missing); 303 304 LastMissingDefaultArg = p; 305 } 306 } 307 308 if (LastMissingDefaultArg > 0) { 309 // Some default arguments were missing. Clear out all of the 310 // default arguments up to (and including) the last missing 311 // default argument, so that we leave the function parameters 312 // in a semantically valid state. 313 for (p = 0; p <= LastMissingDefaultArg; ++p) { 314 ParmVarDecl *Param = FD->getParamDecl(p); 315 if (Param->hasDefaultArg()) { 316 if (!Param->hasUnparsedDefaultArg()) 317 Param->getDefaultArg()->Destroy(Context); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322} 323 324/// isCurrentClassName - Determine whether the identifier II is the 325/// name of the class type currently being defined. In the case of 326/// nested classes, this will only return true if II is the name of 327/// the innermost class. 328bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 329 const CXXScopeSpec *SS) { 330 CXXRecordDecl *CurDecl; 331 if (SS && SS->isSet() && !SS->isInvalid()) { 332 DeclContext *DC = computeDeclContext(*SS); 333 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 334 } else 335 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 336 337 if (CurDecl) 338 return &II == CurDecl->getIdentifier(); 339 else 340 return false; 341} 342 343/// \brief Check the validity of a C++ base class specifier. 344/// 345/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 346/// and returns NULL otherwise. 347CXXBaseSpecifier * 348Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 349 SourceRange SpecifierRange, 350 bool Virtual, AccessSpecifier Access, 351 QualType BaseType, 352 SourceLocation BaseLoc) { 353 // C++ [class.union]p1: 354 // A union shall not have base classes. 355 if (Class->isUnion()) { 356 Diag(Class->getLocation(), diag::err_base_clause_on_union) 357 << SpecifierRange; 358 return 0; 359 } 360 361 if (BaseType->isDependentType()) 362 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 363 Class->getTagKind() == RecordDecl::TK_class, 364 Access, BaseType); 365 366 // Base specifiers must be record types. 367 if (!BaseType->isRecordType()) { 368 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 369 return 0; 370 } 371 372 // C++ [class.union]p1: 373 // A union shall not be used as a base class. 374 if (BaseType->isUnionType()) { 375 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 376 return 0; 377 } 378 379 // C++ [class.derived]p2: 380 // The class-name in a base-specifier shall not be an incompletely 381 // defined class. 382 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 383 SpecifierRange)) 384 return 0; 385 386 // If the base class is polymorphic, the new one is, too. 387 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 388 assert(BaseDecl && "Record type has no declaration"); 389 BaseDecl = BaseDecl->getDefinition(Context); 390 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 391 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 392 Class->setPolymorphic(true); 393 394 // C++ [dcl.init.aggr]p1: 395 // An aggregate is [...] a class with [...] no base classes [...]. 396 Class->setAggregate(false); 397 Class->setPOD(false); 398 399 if (Virtual) { 400 // C++ [class.ctor]p5: 401 // A constructor is trivial if its class has no virtual base classes. 402 Class->setHasTrivialConstructor(false); 403 404 // C++ [class.copy]p6: 405 // A copy constructor is trivial if its class has no virtual base classes. 406 Class->setHasTrivialCopyConstructor(false); 407 408 // C++ [class.copy]p11: 409 // A copy assignment operator is trivial if its class has no virtual 410 // base classes. 411 Class->setHasTrivialCopyAssignment(false); 412 } else { 413 // C++ [class.ctor]p5: 414 // A constructor is trivial if all the direct base classes of its 415 // class have trivial constructors. 416 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 417 Class->setHasTrivialConstructor(false); 418 419 // C++ [class.copy]p6: 420 // A copy constructor is trivial if all the direct base classes of its 421 // class have trivial copy constructors. 422 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 423 Class->setHasTrivialCopyConstructor(false); 424 425 // C++ [class.copy]p11: 426 // A copy assignment operator is trivial if all the direct base classes 427 // of its class have trivial copy assignment operators. 428 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 429 Class->setHasTrivialCopyAssignment(false); 430 } 431 432 // C++ [class.ctor]p3: 433 // A destructor is trivial if all the direct base classes of its class 434 // have trivial destructors. 435 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 436 Class->setHasTrivialDestructor(false); 437 438 // Create the base specifier. 439 // FIXME: Allocate via ASTContext? 440 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 441 Class->getTagKind() == RecordDecl::TK_class, 442 Access, BaseType); 443} 444 445/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 446/// one entry in the base class list of a class specifier, for 447/// example: 448/// class foo : public bar, virtual private baz { 449/// 'public bar' and 'virtual private baz' are each base-specifiers. 450Sema::BaseResult 451Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 452 bool Virtual, AccessSpecifier Access, 453 TypeTy *basetype, SourceLocation BaseLoc) { 454 if (!classdecl) 455 return true; 456 457 AdjustDeclIfTemplate(classdecl); 458 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 459 QualType BaseType = QualType::getFromOpaquePtr(basetype); 460 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 461 Virtual, Access, 462 BaseType, BaseLoc)) 463 return BaseSpec; 464 465 return true; 466} 467 468/// \brief Performs the actual work of attaching the given base class 469/// specifiers to a C++ class. 470bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 471 unsigned NumBases) { 472 if (NumBases == 0) 473 return false; 474 475 // Used to keep track of which base types we have already seen, so 476 // that we can properly diagnose redundant direct base types. Note 477 // that the key is always the unqualified canonical type of the base 478 // class. 479 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 480 481 // Copy non-redundant base specifiers into permanent storage. 482 unsigned NumGoodBases = 0; 483 bool Invalid = false; 484 for (unsigned idx = 0; idx < NumBases; ++idx) { 485 QualType NewBaseType 486 = Context.getCanonicalType(Bases[idx]->getType()); 487 NewBaseType = NewBaseType.getUnqualifiedType(); 488 489 if (KnownBaseTypes[NewBaseType]) { 490 // C++ [class.mi]p3: 491 // A class shall not be specified as a direct base class of a 492 // derived class more than once. 493 Diag(Bases[idx]->getSourceRange().getBegin(), 494 diag::err_duplicate_base_class) 495 << KnownBaseTypes[NewBaseType]->getType() 496 << Bases[idx]->getSourceRange(); 497 498 // Delete the duplicate base class specifier; we're going to 499 // overwrite its pointer later. 500 Context.Deallocate(Bases[idx]); 501 502 Invalid = true; 503 } else { 504 // Okay, add this new base class. 505 KnownBaseTypes[NewBaseType] = Bases[idx]; 506 Bases[NumGoodBases++] = Bases[idx]; 507 } 508 } 509 510 // Attach the remaining base class specifiers to the derived class. 511 Class->setBases(Context, Bases, NumGoodBases); 512 513 // Delete the remaining (good) base class specifiers, since their 514 // data has been copied into the CXXRecordDecl. 515 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 516 Context.Deallocate(Bases[idx]); 517 518 return Invalid; 519} 520 521/// ActOnBaseSpecifiers - Attach the given base specifiers to the 522/// class, after checking whether there are any duplicate base 523/// classes. 524void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 525 unsigned NumBases) { 526 if (!ClassDecl || !Bases || !NumBases) 527 return; 528 529 AdjustDeclIfTemplate(ClassDecl); 530 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 531 (CXXBaseSpecifier**)(Bases), NumBases); 532} 533 534//===----------------------------------------------------------------------===// 535// C++ class member Handling 536//===----------------------------------------------------------------------===// 537 538/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 539/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 540/// bitfield width if there is one and 'InitExpr' specifies the initializer if 541/// any. 542Sema::DeclPtrTy 543Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 544 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 545 const DeclSpec &DS = D.getDeclSpec(); 546 DeclarationName Name = GetNameForDeclarator(D); 547 Expr *BitWidth = static_cast<Expr*>(BW); 548 Expr *Init = static_cast<Expr*>(InitExpr); 549 SourceLocation Loc = D.getIdentifierLoc(); 550 551 bool isFunc = D.isFunctionDeclarator(); 552 553 // C++ 9.2p6: A member shall not be declared to have automatic storage 554 // duration (auto, register) or with the extern storage-class-specifier. 555 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 556 // data members and cannot be applied to names declared const or static, 557 // and cannot be applied to reference members. 558 switch (DS.getStorageClassSpec()) { 559 case DeclSpec::SCS_unspecified: 560 case DeclSpec::SCS_typedef: 561 case DeclSpec::SCS_static: 562 // FALL THROUGH. 563 break; 564 case DeclSpec::SCS_mutable: 565 if (isFunc) { 566 if (DS.getStorageClassSpecLoc().isValid()) 567 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 568 else 569 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 570 571 // FIXME: It would be nicer if the keyword was ignored only for this 572 // declarator. Otherwise we could get follow-up errors. 573 D.getMutableDeclSpec().ClearStorageClassSpecs(); 574 } else { 575 QualType T = GetTypeForDeclarator(D, S); 576 diag::kind err = static_cast<diag::kind>(0); 577 if (T->isReferenceType()) 578 err = diag::err_mutable_reference; 579 else if (T.isConstQualified()) 580 err = diag::err_mutable_const; 581 if (err != 0) { 582 if (DS.getStorageClassSpecLoc().isValid()) 583 Diag(DS.getStorageClassSpecLoc(), err); 584 else 585 Diag(DS.getThreadSpecLoc(), err); 586 // FIXME: It would be nicer if the keyword was ignored only for this 587 // declarator. Otherwise we could get follow-up errors. 588 D.getMutableDeclSpec().ClearStorageClassSpecs(); 589 } 590 } 591 break; 592 default: 593 if (DS.getStorageClassSpecLoc().isValid()) 594 Diag(DS.getStorageClassSpecLoc(), 595 diag::err_storageclass_invalid_for_member); 596 else 597 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 598 D.getMutableDeclSpec().ClearStorageClassSpecs(); 599 } 600 601 if (!isFunc && 602 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 603 D.getNumTypeObjects() == 0) { 604 // Check also for this case: 605 // 606 // typedef int f(); 607 // f a; 608 // 609 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 610 isFunc = TDType->isFunctionType(); 611 } 612 613 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 614 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 615 !isFunc); 616 617 Decl *Member; 618 if (isInstField) { 619 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 620 AS); 621 assert(Member && "HandleField never returns null"); 622 } else { 623 Member = ActOnDeclarator(S, D).getAs<Decl>(); 624 if (!Member) { 625 if (BitWidth) DeleteExpr(BitWidth); 626 return DeclPtrTy(); 627 } 628 629 // Non-instance-fields can't have a bitfield. 630 if (BitWidth) { 631 if (Member->isInvalidDecl()) { 632 // don't emit another diagnostic. 633 } else if (isa<VarDecl>(Member)) { 634 // C++ 9.6p3: A bit-field shall not be a static member. 635 // "static member 'A' cannot be a bit-field" 636 Diag(Loc, diag::err_static_not_bitfield) 637 << Name << BitWidth->getSourceRange(); 638 } else if (isa<TypedefDecl>(Member)) { 639 // "typedef member 'x' cannot be a bit-field" 640 Diag(Loc, diag::err_typedef_not_bitfield) 641 << Name << BitWidth->getSourceRange(); 642 } else { 643 // A function typedef ("typedef int f(); f a;"). 644 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 645 Diag(Loc, diag::err_not_integral_type_bitfield) 646 << Name << cast<ValueDecl>(Member)->getType() 647 << BitWidth->getSourceRange(); 648 } 649 650 DeleteExpr(BitWidth); 651 BitWidth = 0; 652 Member->setInvalidDecl(); 653 } 654 655 Member->setAccess(AS); 656 } 657 658 assert((Name || isInstField) && "No identifier for non-field ?"); 659 660 if (Init) 661 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 662 if (Deleted) // FIXME: Source location is not very good. 663 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 664 665 if (isInstField) { 666 FieldCollector->Add(cast<FieldDecl>(Member)); 667 return DeclPtrTy(); 668 } 669 return DeclPtrTy::make(Member); 670} 671 672/// ActOnMemInitializer - Handle a C++ member initializer. 673Sema::MemInitResult 674Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 675 Scope *S, 676 const CXXScopeSpec &SS, 677 IdentifierInfo *MemberOrBase, 678 TypeTy *TemplateTypeTy, 679 SourceLocation IdLoc, 680 SourceLocation LParenLoc, 681 ExprTy **Args, unsigned NumArgs, 682 SourceLocation *CommaLocs, 683 SourceLocation RParenLoc) { 684 if (!ConstructorD) 685 return true; 686 687 CXXConstructorDecl *Constructor 688 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 689 if (!Constructor) { 690 // The user wrote a constructor initializer on a function that is 691 // not a C++ constructor. Ignore the error for now, because we may 692 // have more member initializers coming; we'll diagnose it just 693 // once in ActOnMemInitializers. 694 return true; 695 } 696 697 CXXRecordDecl *ClassDecl = Constructor->getParent(); 698 699 // C++ [class.base.init]p2: 700 // Names in a mem-initializer-id are looked up in the scope of the 701 // constructor’s class and, if not found in that scope, are looked 702 // up in the scope containing the constructor’s 703 // definition. [Note: if the constructor’s class contains a member 704 // with the same name as a direct or virtual base class of the 705 // class, a mem-initializer-id naming the member or base class and 706 // composed of a single identifier refers to the class member. A 707 // mem-initializer-id for the hidden base class may be specified 708 // using a qualified name. ] 709 if (!SS.getScopeRep() && !TemplateTypeTy) { 710 // Look for a member, first. 711 FieldDecl *Member = 0; 712 DeclContext::lookup_result Result 713 = ClassDecl->lookup(MemberOrBase); 714 if (Result.first != Result.second) 715 Member = dyn_cast<FieldDecl>(*Result.first); 716 717 // FIXME: Handle members of an anonymous union. 718 719 if (Member) { 720 CXXConstructorDecl *C = 0; 721 QualType FieldType = Member->getType(); 722 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 723 FieldType = Array->getElementType(); 724 if (!FieldType->isDependentType() && FieldType->getAsRecordType()) 725 C = PerformInitializationByConstructor( 726 FieldType, (Expr **)Args, NumArgs, IdLoc, 727 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 728 else if (NumArgs != 1) 729 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 730 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 731 else { 732 Expr * NewExp = (Expr*)Args[0]; 733 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 734 return true; 735 Args[0] = NewExp; 736 } 737 // FIXME: Perform direct initialization of the member. 738 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 739 NumArgs, C, IdLoc); 740 } 741 } 742 // It didn't name a member, so see if it names a class. 743 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 744 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 745 if (!BaseTy) 746 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 747 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 748 749 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 750 if (!BaseType->isRecordType() && !BaseType->isDependentType()) 751 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 752 << BaseType << SourceRange(IdLoc, RParenLoc); 753 754 // C++ [class.base.init]p2: 755 // [...] Unless the mem-initializer-id names a nonstatic data 756 // member of the constructor’s class or a direct or virtual base 757 // of that class, the mem-initializer is ill-formed. A 758 // mem-initializer-list can initialize a base class using any 759 // name that denotes that base class type. 760 761 // First, check for a direct base class. 762 const CXXBaseSpecifier *DirectBaseSpec = 0; 763 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 764 Base != ClassDecl->bases_end(); ++Base) { 765 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 766 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 767 // We found a direct base of this type. That's what we're 768 // initializing. 769 DirectBaseSpec = &*Base; 770 break; 771 } 772 } 773 774 // Check for a virtual base class. 775 // FIXME: We might be able to short-circuit this if we know in advance that 776 // there are no virtual bases. 777 const CXXBaseSpecifier *VirtualBaseSpec = 0; 778 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 779 // We haven't found a base yet; search the class hierarchy for a 780 // virtual base class. 781 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 782 /*DetectVirtual=*/false); 783 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 784 for (BasePaths::paths_iterator Path = Paths.begin(); 785 Path != Paths.end(); ++Path) { 786 if (Path->back().Base->isVirtual()) { 787 VirtualBaseSpec = Path->back().Base; 788 break; 789 } 790 } 791 } 792 } 793 794 // C++ [base.class.init]p2: 795 // If a mem-initializer-id is ambiguous because it designates both 796 // a direct non-virtual base class and an inherited virtual base 797 // class, the mem-initializer is ill-formed. 798 if (DirectBaseSpec && VirtualBaseSpec) 799 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 800 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 801 // C++ [base.class.init]p2: 802 // Unless the mem-initializer-id names a nonstatic data membeer of the 803 // constructor's class ot a direst or virtual base of that class, the 804 // mem-initializer is ill-formed. 805 if (!DirectBaseSpec && !VirtualBaseSpec) 806 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 807 << BaseType << ClassDecl->getNameAsCString() 808 << SourceRange(IdLoc, RParenLoc); 809 DeclarationName Name 810 = Context.DeclarationNames.getCXXConstructorName( 811 Context.getCanonicalType(BaseType)); 812 CXXConstructorDecl *C = 0; 813 if (!BaseType->isDependentType()) 814 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, IdLoc, 815 SourceRange(IdLoc, RParenLoc), Name, 816 IK_Direct); 817 818 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 819 NumArgs, C, IdLoc); 820} 821 822void 823Sema::BuildBaseOrMemberInitializers(ASTContext &C, 824 CXXConstructorDecl *Constructor, 825 CXXBaseOrMemberInitializer **Initializers, 826 unsigned NumInitializers 827 ) { 828 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 829 llvm::SmallVector<FieldDecl *, 4>Members; 830 831 Constructor->setBaseOrMemberInitializers(C, 832 Initializers, NumInitializers, 833 Bases, Members); 834 for (unsigned int i = 0; i < Bases.size(); i++) 835 Diag(Bases[i]->getSourceRange().getBegin(), 836 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 837 for (unsigned int i = 0; i < Members.size(); i++) 838 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 839 << 1 << Members[i]->getType(); 840} 841 842static void *GetKeyForTopLevelField(FieldDecl *Field) { 843 // For anonymous unions, use the class declaration as the key. 844 if (const RecordType *RT = Field->getType()->getAsRecordType()) { 845 if (RT->getDecl()->isAnonymousStructOrUnion()) 846 return static_cast<void *>(RT->getDecl()); 847 } 848 return static_cast<void *>(Field); 849} 850 851static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 852 // For fields injected into the class via declaration of an anonymous union, 853 // use its anonymous union class declaration as the unique key. 854 if (FieldDecl *Field = Member->getMember()) { 855 if (Field->getDeclContext()->isRecord()) { 856 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 857 if (RD->isAnonymousStructOrUnion()) 858 return static_cast<void *>(RD); 859 } 860 return static_cast<void *>(Field); 861 } 862 return static_cast<RecordType *>(Member->getBaseClass()); 863} 864 865void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 866 SourceLocation ColonLoc, 867 MemInitTy **MemInits, unsigned NumMemInits) { 868 if (!ConstructorDecl) 869 return; 870 871 CXXConstructorDecl *Constructor 872 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 873 874 if (!Constructor) { 875 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 876 return; 877 } 878 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 879 bool err = false; 880 for (unsigned i = 0; i < NumMemInits; i++) { 881 CXXBaseOrMemberInitializer *Member = 882 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 883 void *KeyToMember = GetKeyForMember(Member); 884 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 885 if (!PrevMember) { 886 PrevMember = Member; 887 continue; 888 } 889 if (FieldDecl *Field = Member->getMember()) 890 Diag(Member->getSourceLocation(), 891 diag::error_multiple_mem_initialization) 892 << Field->getNameAsString(); 893 else { 894 Type *BaseClass = Member->getBaseClass(); 895 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 896 Diag(Member->getSourceLocation(), 897 diag::error_multiple_base_initialization) 898 << BaseClass->getDesugaredType(true); 899 } 900 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 901 << 0; 902 err = true; 903 } 904 if (!err) 905 BuildBaseOrMemberInitializers(Context, Constructor, 906 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 907 NumMemInits); 908 909 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 910 != Diagnostic::Ignored || 911 Diags.getDiagnosticLevel(diag::warn_field_initialized) 912 != Diagnostic::Ignored)) { 913 // Also issue warning if order of ctor-initializer list does not match order 914 // of 1) base class declarations and 2) order of non-static data members. 915 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 916 917 CXXRecordDecl *ClassDecl 918 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 919 // Push virtual bases before others. 920 for (CXXRecordDecl::base_class_iterator VBase = 921 ClassDecl->vbases_begin(), 922 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 923 AllBaseOrMembers.push_back(VBase->getType()->getAsRecordType()); 924 925 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 926 E = ClassDecl->bases_end(); Base != E; ++Base) { 927 // Virtuals are alread in the virtual base list and are constructed 928 // first. 929 if (Base->isVirtual()) 930 continue; 931 AllBaseOrMembers.push_back(Base->getType()->getAsRecordType()); 932 } 933 934 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 935 E = ClassDecl->field_end(); Field != E; ++Field) 936 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 937 938 int Last = AllBaseOrMembers.size(); 939 int curIndex = 0; 940 CXXBaseOrMemberInitializer *PrevMember = 0; 941 for (unsigned i = 0; i < NumMemInits; i++) { 942 CXXBaseOrMemberInitializer *Member = 943 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 944 void *MemberInCtorList = GetKeyForMember(Member); 945 946 for (; curIndex < Last; curIndex++) 947 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 948 break; 949 if (curIndex == Last) { 950 assert(PrevMember && "Member not in member list?!"); 951 // Initializer as specified in ctor-initializer list is out of order. 952 // Issue a warning diagnostic. 953 if (PrevMember->isBaseInitializer()) { 954 // Diagnostics is for an initialized base class. 955 Type *BaseClass = PrevMember->getBaseClass(); 956 Diag(PrevMember->getSourceLocation(), 957 diag::warn_base_initialized) 958 << BaseClass->getDesugaredType(true); 959 } 960 else { 961 FieldDecl *Field = PrevMember->getMember(); 962 Diag(PrevMember->getSourceLocation(), 963 diag::warn_field_initialized) 964 << Field->getNameAsString(); 965 } 966 // Also the note! 967 if (FieldDecl *Field = Member->getMember()) 968 Diag(Member->getSourceLocation(), 969 diag::note_fieldorbase_initialized_here) << 0 970 << Field->getNameAsString(); 971 else { 972 Type *BaseClass = Member->getBaseClass(); 973 Diag(Member->getSourceLocation(), 974 diag::note_fieldorbase_initialized_here) << 1 975 << BaseClass->getDesugaredType(true); 976 } 977 for (curIndex = 0; curIndex < Last; curIndex++) 978 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 979 break; 980 } 981 PrevMember = Member; 982 } 983 } 984} 985 986void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 987 if (!CDtorDecl) 988 return; 989 990 if (CXXConstructorDecl *Constructor 991 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 992 BuildBaseOrMemberInitializers(Context, 993 Constructor, 994 (CXXBaseOrMemberInitializer **)0, 0); 995} 996 997namespace { 998 /// PureVirtualMethodCollector - traverses a class and its superclasses 999 /// and determines if it has any pure virtual methods. 1000 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1001 ASTContext &Context; 1002 1003 public: 1004 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1005 1006 private: 1007 MethodList Methods; 1008 1009 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1010 1011 public: 1012 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1013 : Context(Ctx) { 1014 1015 MethodList List; 1016 Collect(RD, List); 1017 1018 // Copy the temporary list to methods, and make sure to ignore any 1019 // null entries. 1020 for (size_t i = 0, e = List.size(); i != e; ++i) { 1021 if (List[i]) 1022 Methods.push_back(List[i]); 1023 } 1024 } 1025 1026 bool empty() const { return Methods.empty(); } 1027 1028 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1029 MethodList::const_iterator methods_end() { return Methods.end(); } 1030 }; 1031 1032 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1033 MethodList& Methods) { 1034 // First, collect the pure virtual methods for the base classes. 1035 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1036 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1037 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 1038 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1039 if (BaseDecl && BaseDecl->isAbstract()) 1040 Collect(BaseDecl, Methods); 1041 } 1042 } 1043 1044 // Next, zero out any pure virtual methods that this class overrides. 1045 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1046 1047 MethodSetTy OverriddenMethods; 1048 size_t MethodsSize = Methods.size(); 1049 1050 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1051 i != e; ++i) { 1052 // Traverse the record, looking for methods. 1053 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1054 // If the method is pure virtual, add it to the methods vector. 1055 if (MD->isPure()) { 1056 Methods.push_back(MD); 1057 continue; 1058 } 1059 1060 // Otherwise, record all the overridden methods in our set. 1061 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1062 E = MD->end_overridden_methods(); I != E; ++I) { 1063 // Keep track of the overridden methods. 1064 OverriddenMethods.insert(*I); 1065 } 1066 } 1067 } 1068 1069 // Now go through the methods and zero out all the ones we know are 1070 // overridden. 1071 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1072 if (OverriddenMethods.count(Methods[i])) 1073 Methods[i] = 0; 1074 } 1075 1076 } 1077} 1078 1079bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1080 unsigned DiagID, AbstractDiagSelID SelID, 1081 const CXXRecordDecl *CurrentRD) { 1082 1083 if (!getLangOptions().CPlusPlus) 1084 return false; 1085 1086 if (const ArrayType *AT = Context.getAsArrayType(T)) 1087 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1088 CurrentRD); 1089 1090 if (const PointerType *PT = T->getAsPointerType()) { 1091 // Find the innermost pointer type. 1092 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 1093 PT = T; 1094 1095 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1096 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1097 CurrentRD); 1098 } 1099 1100 const RecordType *RT = T->getAsRecordType(); 1101 if (!RT) 1102 return false; 1103 1104 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1105 if (!RD) 1106 return false; 1107 1108 if (CurrentRD && CurrentRD != RD) 1109 return false; 1110 1111 if (!RD->isAbstract()) 1112 return false; 1113 1114 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1115 1116 // Check if we've already emitted the list of pure virtual functions for this 1117 // class. 1118 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1119 return true; 1120 1121 PureVirtualMethodCollector Collector(Context, RD); 1122 1123 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1124 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1125 const CXXMethodDecl *MD = *I; 1126 1127 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1128 MD->getDeclName(); 1129 } 1130 1131 if (!PureVirtualClassDiagSet) 1132 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1133 PureVirtualClassDiagSet->insert(RD); 1134 1135 return true; 1136} 1137 1138namespace { 1139 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1140 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1141 Sema &SemaRef; 1142 CXXRecordDecl *AbstractClass; 1143 1144 bool VisitDeclContext(const DeclContext *DC) { 1145 bool Invalid = false; 1146 1147 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1148 E = DC->decls_end(); I != E; ++I) 1149 Invalid |= Visit(*I); 1150 1151 return Invalid; 1152 } 1153 1154 public: 1155 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1156 : SemaRef(SemaRef), AbstractClass(ac) { 1157 Visit(SemaRef.Context.getTranslationUnitDecl()); 1158 } 1159 1160 bool VisitFunctionDecl(const FunctionDecl *FD) { 1161 if (FD->isThisDeclarationADefinition()) { 1162 // No need to do the check if we're in a definition, because it requires 1163 // that the return/param types are complete. 1164 // because that requires 1165 return VisitDeclContext(FD); 1166 } 1167 1168 // Check the return type. 1169 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1170 bool Invalid = 1171 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1172 diag::err_abstract_type_in_decl, 1173 Sema::AbstractReturnType, 1174 AbstractClass); 1175 1176 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1177 E = FD->param_end(); I != E; ++I) { 1178 const ParmVarDecl *VD = *I; 1179 Invalid |= 1180 SemaRef.RequireNonAbstractType(VD->getLocation(), 1181 VD->getOriginalType(), 1182 diag::err_abstract_type_in_decl, 1183 Sema::AbstractParamType, 1184 AbstractClass); 1185 } 1186 1187 return Invalid; 1188 } 1189 1190 bool VisitDecl(const Decl* D) { 1191 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1192 return VisitDeclContext(DC); 1193 1194 return false; 1195 } 1196 }; 1197} 1198 1199void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1200 DeclPtrTy TagDecl, 1201 SourceLocation LBrac, 1202 SourceLocation RBrac) { 1203 if (!TagDecl) 1204 return; 1205 1206 AdjustDeclIfTemplate(TagDecl); 1207 ActOnFields(S, RLoc, TagDecl, 1208 (DeclPtrTy*)FieldCollector->getCurFields(), 1209 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1210 1211 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1212 if (!RD->isAbstract()) { 1213 // Collect all the pure virtual methods and see if this is an abstract 1214 // class after all. 1215 PureVirtualMethodCollector Collector(Context, RD); 1216 if (!Collector.empty()) 1217 RD->setAbstract(true); 1218 } 1219 1220 if (RD->isAbstract()) 1221 AbstractClassUsageDiagnoser(*this, RD); 1222 1223 if (!RD->isDependentType()) 1224 AddImplicitlyDeclaredMembersToClass(RD); 1225} 1226 1227/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1228/// special functions, such as the default constructor, copy 1229/// constructor, or destructor, to the given C++ class (C++ 1230/// [special]p1). This routine can only be executed just before the 1231/// definition of the class is complete. 1232void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1233 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1234 ClassType = Context.getCanonicalType(ClassType); 1235 1236 // FIXME: Implicit declarations have exception specifications, which are 1237 // the union of the specifications of the implicitly called functions. 1238 1239 if (!ClassDecl->hasUserDeclaredConstructor()) { 1240 // C++ [class.ctor]p5: 1241 // A default constructor for a class X is a constructor of class X 1242 // that can be called without an argument. If there is no 1243 // user-declared constructor for class X, a default constructor is 1244 // implicitly declared. An implicitly-declared default constructor 1245 // is an inline public member of its class. 1246 DeclarationName Name 1247 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1248 CXXConstructorDecl *DefaultCon = 1249 CXXConstructorDecl::Create(Context, ClassDecl, 1250 ClassDecl->getLocation(), Name, 1251 Context.getFunctionType(Context.VoidTy, 1252 0, 0, false, 0), 1253 /*isExplicit=*/false, 1254 /*isInline=*/true, 1255 /*isImplicitlyDeclared=*/true); 1256 DefaultCon->setAccess(AS_public); 1257 DefaultCon->setImplicit(); 1258 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1259 ClassDecl->addDecl(DefaultCon); 1260 } 1261 1262 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1263 // C++ [class.copy]p4: 1264 // If the class definition does not explicitly declare a copy 1265 // constructor, one is declared implicitly. 1266 1267 // C++ [class.copy]p5: 1268 // The implicitly-declared copy constructor for a class X will 1269 // have the form 1270 // 1271 // X::X(const X&) 1272 // 1273 // if 1274 bool HasConstCopyConstructor = true; 1275 1276 // -- each direct or virtual base class B of X has a copy 1277 // constructor whose first parameter is of type const B& or 1278 // const volatile B&, and 1279 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1280 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1281 const CXXRecordDecl *BaseClassDecl 1282 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1283 HasConstCopyConstructor 1284 = BaseClassDecl->hasConstCopyConstructor(Context); 1285 } 1286 1287 // -- for all the nonstatic data members of X that are of a 1288 // class type M (or array thereof), each such class type 1289 // has a copy constructor whose first parameter is of type 1290 // const M& or const volatile M&. 1291 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1292 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1293 ++Field) { 1294 QualType FieldType = (*Field)->getType(); 1295 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1296 FieldType = Array->getElementType(); 1297 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1298 const CXXRecordDecl *FieldClassDecl 1299 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1300 HasConstCopyConstructor 1301 = FieldClassDecl->hasConstCopyConstructor(Context); 1302 } 1303 } 1304 1305 // Otherwise, the implicitly declared copy constructor will have 1306 // the form 1307 // 1308 // X::X(X&) 1309 QualType ArgType = ClassType; 1310 if (HasConstCopyConstructor) 1311 ArgType = ArgType.withConst(); 1312 ArgType = Context.getLValueReferenceType(ArgType); 1313 1314 // An implicitly-declared copy constructor is an inline public 1315 // member of its class. 1316 DeclarationName Name 1317 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1318 CXXConstructorDecl *CopyConstructor 1319 = CXXConstructorDecl::Create(Context, ClassDecl, 1320 ClassDecl->getLocation(), Name, 1321 Context.getFunctionType(Context.VoidTy, 1322 &ArgType, 1, 1323 false, 0), 1324 /*isExplicit=*/false, 1325 /*isInline=*/true, 1326 /*isImplicitlyDeclared=*/true); 1327 CopyConstructor->setAccess(AS_public); 1328 CopyConstructor->setImplicit(); 1329 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1330 1331 // Add the parameter to the constructor. 1332 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1333 ClassDecl->getLocation(), 1334 /*IdentifierInfo=*/0, 1335 ArgType, VarDecl::None, 0); 1336 CopyConstructor->setParams(Context, &FromParam, 1); 1337 ClassDecl->addDecl(CopyConstructor); 1338 } 1339 1340 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1341 // Note: The following rules are largely analoguous to the copy 1342 // constructor rules. Note that virtual bases are not taken into account 1343 // for determining the argument type of the operator. Note also that 1344 // operators taking an object instead of a reference are allowed. 1345 // 1346 // C++ [class.copy]p10: 1347 // If the class definition does not explicitly declare a copy 1348 // assignment operator, one is declared implicitly. 1349 // The implicitly-defined copy assignment operator for a class X 1350 // will have the form 1351 // 1352 // X& X::operator=(const X&) 1353 // 1354 // if 1355 bool HasConstCopyAssignment = true; 1356 1357 // -- each direct base class B of X has a copy assignment operator 1358 // whose parameter is of type const B&, const volatile B& or B, 1359 // and 1360 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1361 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1362 const CXXRecordDecl *BaseClassDecl 1363 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1364 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1365 } 1366 1367 // -- for all the nonstatic data members of X that are of a class 1368 // type M (or array thereof), each such class type has a copy 1369 // assignment operator whose parameter is of type const M&, 1370 // const volatile M& or M. 1371 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1372 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1373 ++Field) { 1374 QualType FieldType = (*Field)->getType(); 1375 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1376 FieldType = Array->getElementType(); 1377 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1378 const CXXRecordDecl *FieldClassDecl 1379 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1380 HasConstCopyAssignment 1381 = FieldClassDecl->hasConstCopyAssignment(Context); 1382 } 1383 } 1384 1385 // Otherwise, the implicitly declared copy assignment operator will 1386 // have the form 1387 // 1388 // X& X::operator=(X&) 1389 QualType ArgType = ClassType; 1390 QualType RetType = Context.getLValueReferenceType(ArgType); 1391 if (HasConstCopyAssignment) 1392 ArgType = ArgType.withConst(); 1393 ArgType = Context.getLValueReferenceType(ArgType); 1394 1395 // An implicitly-declared copy assignment operator is an inline public 1396 // member of its class. 1397 DeclarationName Name = 1398 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1399 CXXMethodDecl *CopyAssignment = 1400 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1401 Context.getFunctionType(RetType, &ArgType, 1, 1402 false, 0), 1403 /*isStatic=*/false, /*isInline=*/true); 1404 CopyAssignment->setAccess(AS_public); 1405 CopyAssignment->setImplicit(); 1406 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1407 1408 // Add the parameter to the operator. 1409 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1410 ClassDecl->getLocation(), 1411 /*IdentifierInfo=*/0, 1412 ArgType, VarDecl::None, 0); 1413 CopyAssignment->setParams(Context, &FromParam, 1); 1414 1415 // Don't call addedAssignmentOperator. There is no way to distinguish an 1416 // implicit from an explicit assignment operator. 1417 ClassDecl->addDecl(CopyAssignment); 1418 } 1419 1420 if (!ClassDecl->hasUserDeclaredDestructor()) { 1421 // C++ [class.dtor]p2: 1422 // If a class has no user-declared destructor, a destructor is 1423 // declared implicitly. An implicitly-declared destructor is an 1424 // inline public member of its class. 1425 DeclarationName Name 1426 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1427 CXXDestructorDecl *Destructor 1428 = CXXDestructorDecl::Create(Context, ClassDecl, 1429 ClassDecl->getLocation(), Name, 1430 Context.getFunctionType(Context.VoidTy, 1431 0, 0, false, 0), 1432 /*isInline=*/true, 1433 /*isImplicitlyDeclared=*/true); 1434 Destructor->setAccess(AS_public); 1435 Destructor->setImplicit(); 1436 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1437 ClassDecl->addDecl(Destructor); 1438 } 1439} 1440 1441void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1442 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1443 if (!Template) 1444 return; 1445 1446 TemplateParameterList *Params = Template->getTemplateParameters(); 1447 for (TemplateParameterList::iterator Param = Params->begin(), 1448 ParamEnd = Params->end(); 1449 Param != ParamEnd; ++Param) { 1450 NamedDecl *Named = cast<NamedDecl>(*Param); 1451 if (Named->getDeclName()) { 1452 S->AddDecl(DeclPtrTy::make(Named)); 1453 IdResolver.AddDecl(Named); 1454 } 1455 } 1456} 1457 1458/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1459/// parsing a top-level (non-nested) C++ class, and we are now 1460/// parsing those parts of the given Method declaration that could 1461/// not be parsed earlier (C++ [class.mem]p2), such as default 1462/// arguments. This action should enter the scope of the given 1463/// Method declaration as if we had just parsed the qualified method 1464/// name. However, it should not bring the parameters into scope; 1465/// that will be performed by ActOnDelayedCXXMethodParameter. 1466void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1467 if (!MethodD) 1468 return; 1469 1470 CXXScopeSpec SS; 1471 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1472 QualType ClassTy 1473 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1474 SS.setScopeRep( 1475 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1476 ActOnCXXEnterDeclaratorScope(S, SS); 1477} 1478 1479/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1480/// C++ method declaration. We're (re-)introducing the given 1481/// function parameter into scope for use in parsing later parts of 1482/// the method declaration. For example, we could see an 1483/// ActOnParamDefaultArgument event for this parameter. 1484void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1485 if (!ParamD) 1486 return; 1487 1488 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1489 1490 // If this parameter has an unparsed default argument, clear it out 1491 // to make way for the parsed default argument. 1492 if (Param->hasUnparsedDefaultArg()) 1493 Param->setDefaultArg(0); 1494 1495 S->AddDecl(DeclPtrTy::make(Param)); 1496 if (Param->getDeclName()) 1497 IdResolver.AddDecl(Param); 1498} 1499 1500/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1501/// processing the delayed method declaration for Method. The method 1502/// declaration is now considered finished. There may be a separate 1503/// ActOnStartOfFunctionDef action later (not necessarily 1504/// immediately!) for this method, if it was also defined inside the 1505/// class body. 1506void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1507 if (!MethodD) 1508 return; 1509 1510 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1511 CXXScopeSpec SS; 1512 QualType ClassTy 1513 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1514 SS.setScopeRep( 1515 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1516 ActOnCXXExitDeclaratorScope(S, SS); 1517 1518 // Now that we have our default arguments, check the constructor 1519 // again. It could produce additional diagnostics or affect whether 1520 // the class has implicitly-declared destructors, among other 1521 // things. 1522 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1523 CheckConstructor(Constructor); 1524 1525 // Check the default arguments, which we may have added. 1526 if (!Method->isInvalidDecl()) 1527 CheckCXXDefaultArguments(Method); 1528} 1529 1530/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1531/// the well-formedness of the constructor declarator @p D with type @p 1532/// R. If there are any errors in the declarator, this routine will 1533/// emit diagnostics and set the invalid bit to true. In any case, the type 1534/// will be updated to reflect a well-formed type for the constructor and 1535/// returned. 1536QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1537 FunctionDecl::StorageClass &SC) { 1538 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1539 1540 // C++ [class.ctor]p3: 1541 // A constructor shall not be virtual (10.3) or static (9.4). A 1542 // constructor can be invoked for a const, volatile or const 1543 // volatile object. A constructor shall not be declared const, 1544 // volatile, or const volatile (9.3.2). 1545 if (isVirtual) { 1546 if (!D.isInvalidType()) 1547 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1548 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1549 << SourceRange(D.getIdentifierLoc()); 1550 D.setInvalidType(); 1551 } 1552 if (SC == FunctionDecl::Static) { 1553 if (!D.isInvalidType()) 1554 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1555 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1556 << SourceRange(D.getIdentifierLoc()); 1557 D.setInvalidType(); 1558 SC = FunctionDecl::None; 1559 } 1560 1561 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1562 if (FTI.TypeQuals != 0) { 1563 if (FTI.TypeQuals & QualType::Const) 1564 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1565 << "const" << SourceRange(D.getIdentifierLoc()); 1566 if (FTI.TypeQuals & QualType::Volatile) 1567 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1568 << "volatile" << SourceRange(D.getIdentifierLoc()); 1569 if (FTI.TypeQuals & QualType::Restrict) 1570 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1571 << "restrict" << SourceRange(D.getIdentifierLoc()); 1572 } 1573 1574 // Rebuild the function type "R" without any type qualifiers (in 1575 // case any of the errors above fired) and with "void" as the 1576 // return type, since constructors don't have return types. We 1577 // *always* have to do this, because GetTypeForDeclarator will 1578 // put in a result type of "int" when none was specified. 1579 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1580 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1581 Proto->getNumArgs(), 1582 Proto->isVariadic(), 0); 1583} 1584 1585/// CheckConstructor - Checks a fully-formed constructor for 1586/// well-formedness, issuing any diagnostics required. Returns true if 1587/// the constructor declarator is invalid. 1588void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1589 CXXRecordDecl *ClassDecl 1590 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1591 if (!ClassDecl) 1592 return Constructor->setInvalidDecl(); 1593 1594 // C++ [class.copy]p3: 1595 // A declaration of a constructor for a class X is ill-formed if 1596 // its first parameter is of type (optionally cv-qualified) X and 1597 // either there are no other parameters or else all other 1598 // parameters have default arguments. 1599 if (!Constructor->isInvalidDecl() && 1600 ((Constructor->getNumParams() == 1) || 1601 (Constructor->getNumParams() > 1 && 1602 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1603 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1604 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1605 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1606 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1607 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1608 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1609 Constructor->setInvalidDecl(); 1610 } 1611 } 1612 1613 // Notify the class that we've added a constructor. 1614 ClassDecl->addedConstructor(Context, Constructor); 1615} 1616 1617static inline bool 1618FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1619 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1620 FTI.ArgInfo[0].Param && 1621 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1622} 1623 1624/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1625/// the well-formednes of the destructor declarator @p D with type @p 1626/// R. If there are any errors in the declarator, this routine will 1627/// emit diagnostics and set the declarator to invalid. Even if this happens, 1628/// will be updated to reflect a well-formed type for the destructor and 1629/// returned. 1630QualType Sema::CheckDestructorDeclarator(Declarator &D, 1631 FunctionDecl::StorageClass& SC) { 1632 // C++ [class.dtor]p1: 1633 // [...] A typedef-name that names a class is a class-name 1634 // (7.1.3); however, a typedef-name that names a class shall not 1635 // be used as the identifier in the declarator for a destructor 1636 // declaration. 1637 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1638 if (isa<TypedefType>(DeclaratorType)) { 1639 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1640 << DeclaratorType; 1641 D.setInvalidType(); 1642 } 1643 1644 // C++ [class.dtor]p2: 1645 // A destructor is used to destroy objects of its class type. A 1646 // destructor takes no parameters, and no return type can be 1647 // specified for it (not even void). The address of a destructor 1648 // shall not be taken. A destructor shall not be static. A 1649 // destructor can be invoked for a const, volatile or const 1650 // volatile object. A destructor shall not be declared const, 1651 // volatile or const volatile (9.3.2). 1652 if (SC == FunctionDecl::Static) { 1653 if (!D.isInvalidType()) 1654 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1655 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1656 << SourceRange(D.getIdentifierLoc()); 1657 SC = FunctionDecl::None; 1658 D.setInvalidType(); 1659 } 1660 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1661 // Destructors don't have return types, but the parser will 1662 // happily parse something like: 1663 // 1664 // class X { 1665 // float ~X(); 1666 // }; 1667 // 1668 // The return type will be eliminated later. 1669 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1670 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1671 << SourceRange(D.getIdentifierLoc()); 1672 } 1673 1674 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1675 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1676 if (FTI.TypeQuals & QualType::Const) 1677 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1678 << "const" << SourceRange(D.getIdentifierLoc()); 1679 if (FTI.TypeQuals & QualType::Volatile) 1680 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1681 << "volatile" << SourceRange(D.getIdentifierLoc()); 1682 if (FTI.TypeQuals & QualType::Restrict) 1683 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1684 << "restrict" << SourceRange(D.getIdentifierLoc()); 1685 D.setInvalidType(); 1686 } 1687 1688 // Make sure we don't have any parameters. 1689 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1690 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1691 1692 // Delete the parameters. 1693 FTI.freeArgs(); 1694 D.setInvalidType(); 1695 } 1696 1697 // Make sure the destructor isn't variadic. 1698 if (FTI.isVariadic) { 1699 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1700 D.setInvalidType(); 1701 } 1702 1703 // Rebuild the function type "R" without any type qualifiers or 1704 // parameters (in case any of the errors above fired) and with 1705 // "void" as the return type, since destructors don't have return 1706 // types. We *always* have to do this, because GetTypeForDeclarator 1707 // will put in a result type of "int" when none was specified. 1708 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1709} 1710 1711/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1712/// well-formednes of the conversion function declarator @p D with 1713/// type @p R. If there are any errors in the declarator, this routine 1714/// will emit diagnostics and return true. Otherwise, it will return 1715/// false. Either way, the type @p R will be updated to reflect a 1716/// well-formed type for the conversion operator. 1717void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1718 FunctionDecl::StorageClass& SC) { 1719 // C++ [class.conv.fct]p1: 1720 // Neither parameter types nor return type can be specified. The 1721 // type of a conversion function (8.3.5) is “function taking no 1722 // parameter returning conversion-type-id.” 1723 if (SC == FunctionDecl::Static) { 1724 if (!D.isInvalidType()) 1725 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1726 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1727 << SourceRange(D.getIdentifierLoc()); 1728 D.setInvalidType(); 1729 SC = FunctionDecl::None; 1730 } 1731 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1732 // Conversion functions don't have return types, but the parser will 1733 // happily parse something like: 1734 // 1735 // class X { 1736 // float operator bool(); 1737 // }; 1738 // 1739 // The return type will be changed later anyway. 1740 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1741 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1742 << SourceRange(D.getIdentifierLoc()); 1743 } 1744 1745 // Make sure we don't have any parameters. 1746 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1747 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1748 1749 // Delete the parameters. 1750 D.getTypeObject(0).Fun.freeArgs(); 1751 D.setInvalidType(); 1752 } 1753 1754 // Make sure the conversion function isn't variadic. 1755 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1756 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1757 D.setInvalidType(); 1758 } 1759 1760 // C++ [class.conv.fct]p4: 1761 // The conversion-type-id shall not represent a function type nor 1762 // an array type. 1763 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1764 if (ConvType->isArrayType()) { 1765 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1766 ConvType = Context.getPointerType(ConvType); 1767 D.setInvalidType(); 1768 } else if (ConvType->isFunctionType()) { 1769 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1770 ConvType = Context.getPointerType(ConvType); 1771 D.setInvalidType(); 1772 } 1773 1774 // Rebuild the function type "R" without any parameters (in case any 1775 // of the errors above fired) and with the conversion type as the 1776 // return type. 1777 R = Context.getFunctionType(ConvType, 0, 0, false, 1778 R->getAsFunctionProtoType()->getTypeQuals()); 1779 1780 // C++0x explicit conversion operators. 1781 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1782 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1783 diag::warn_explicit_conversion_functions) 1784 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1785} 1786 1787/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1788/// the declaration of the given C++ conversion function. This routine 1789/// is responsible for recording the conversion function in the C++ 1790/// class, if possible. 1791Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1792 assert(Conversion && "Expected to receive a conversion function declaration"); 1793 1794 // Set the lexical context of this conversion function 1795 Conversion->setLexicalDeclContext(CurContext); 1796 1797 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1798 1799 // Make sure we aren't redeclaring the conversion function. 1800 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1801 1802 // C++ [class.conv.fct]p1: 1803 // [...] A conversion function is never used to convert a 1804 // (possibly cv-qualified) object to the (possibly cv-qualified) 1805 // same object type (or a reference to it), to a (possibly 1806 // cv-qualified) base class of that type (or a reference to it), 1807 // or to (possibly cv-qualified) void. 1808 // FIXME: Suppress this warning if the conversion function ends up being a 1809 // virtual function that overrides a virtual function in a base class. 1810 QualType ClassType 1811 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1812 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1813 ConvType = ConvTypeRef->getPointeeType(); 1814 if (ConvType->isRecordType()) { 1815 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1816 if (ConvType == ClassType) 1817 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1818 << ClassType; 1819 else if (IsDerivedFrom(ClassType, ConvType)) 1820 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1821 << ClassType << ConvType; 1822 } else if (ConvType->isVoidType()) { 1823 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1824 << ClassType << ConvType; 1825 } 1826 1827 if (Conversion->getPreviousDeclaration()) { 1828 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1829 for (OverloadedFunctionDecl::function_iterator 1830 Conv = Conversions->function_begin(), 1831 ConvEnd = Conversions->function_end(); 1832 Conv != ConvEnd; ++Conv) { 1833 if (*Conv 1834 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1835 *Conv = Conversion; 1836 return DeclPtrTy::make(Conversion); 1837 } 1838 } 1839 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1840 } else 1841 ClassDecl->addConversionFunction(Context, Conversion); 1842 1843 return DeclPtrTy::make(Conversion); 1844} 1845 1846//===----------------------------------------------------------------------===// 1847// Namespace Handling 1848//===----------------------------------------------------------------------===// 1849 1850/// ActOnStartNamespaceDef - This is called at the start of a namespace 1851/// definition. 1852Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1853 SourceLocation IdentLoc, 1854 IdentifierInfo *II, 1855 SourceLocation LBrace) { 1856 NamespaceDecl *Namespc = 1857 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1858 Namespc->setLBracLoc(LBrace); 1859 1860 Scope *DeclRegionScope = NamespcScope->getParent(); 1861 1862 if (II) { 1863 // C++ [namespace.def]p2: 1864 // The identifier in an original-namespace-definition shall not have been 1865 // previously defined in the declarative region in which the 1866 // original-namespace-definition appears. The identifier in an 1867 // original-namespace-definition is the name of the namespace. Subsequently 1868 // in that declarative region, it is treated as an original-namespace-name. 1869 1870 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1871 true); 1872 1873 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1874 // This is an extended namespace definition. 1875 // Attach this namespace decl to the chain of extended namespace 1876 // definitions. 1877 OrigNS->setNextNamespace(Namespc); 1878 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1879 1880 // Remove the previous declaration from the scope. 1881 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1882 IdResolver.RemoveDecl(OrigNS); 1883 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1884 } 1885 } else if (PrevDecl) { 1886 // This is an invalid name redefinition. 1887 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1888 << Namespc->getDeclName(); 1889 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1890 Namespc->setInvalidDecl(); 1891 // Continue on to push Namespc as current DeclContext and return it. 1892 } 1893 1894 PushOnScopeChains(Namespc, DeclRegionScope); 1895 } else { 1896 // FIXME: Handle anonymous namespaces 1897 } 1898 1899 // Although we could have an invalid decl (i.e. the namespace name is a 1900 // redefinition), push it as current DeclContext and try to continue parsing. 1901 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1902 // for the namespace has the declarations that showed up in that particular 1903 // namespace definition. 1904 PushDeclContext(NamespcScope, Namespc); 1905 return DeclPtrTy::make(Namespc); 1906} 1907 1908/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1909/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1910void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1911 Decl *Dcl = D.getAs<Decl>(); 1912 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1913 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1914 Namespc->setRBracLoc(RBrace); 1915 PopDeclContext(); 1916} 1917 1918Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1919 SourceLocation UsingLoc, 1920 SourceLocation NamespcLoc, 1921 const CXXScopeSpec &SS, 1922 SourceLocation IdentLoc, 1923 IdentifierInfo *NamespcName, 1924 AttributeList *AttrList) { 1925 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1926 assert(NamespcName && "Invalid NamespcName."); 1927 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1928 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1929 1930 UsingDirectiveDecl *UDir = 0; 1931 1932 // Lookup namespace name. 1933 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1934 LookupNamespaceName, false); 1935 if (R.isAmbiguous()) { 1936 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1937 return DeclPtrTy(); 1938 } 1939 if (NamedDecl *NS = R) { 1940 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1941 // C++ [namespace.udir]p1: 1942 // A using-directive specifies that the names in the nominated 1943 // namespace can be used in the scope in which the 1944 // using-directive appears after the using-directive. During 1945 // unqualified name lookup (3.4.1), the names appear as if they 1946 // were declared in the nearest enclosing namespace which 1947 // contains both the using-directive and the nominated 1948 // namespace. [Note: in this context, “contains” means “contains 1949 // directly or indirectly”. ] 1950 1951 // Find enclosing context containing both using-directive and 1952 // nominated namespace. 1953 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1954 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1955 CommonAncestor = CommonAncestor->getParent(); 1956 1957 UDir = UsingDirectiveDecl::Create(Context, 1958 CurContext, UsingLoc, 1959 NamespcLoc, 1960 SS.getRange(), 1961 (NestedNameSpecifier *)SS.getScopeRep(), 1962 IdentLoc, 1963 cast<NamespaceDecl>(NS), 1964 CommonAncestor); 1965 PushUsingDirective(S, UDir); 1966 } else { 1967 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1968 } 1969 1970 // FIXME: We ignore attributes for now. 1971 delete AttrList; 1972 return DeclPtrTy::make(UDir); 1973} 1974 1975void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1976 // If scope has associated entity, then using directive is at namespace 1977 // or translation unit scope. We add UsingDirectiveDecls, into 1978 // it's lookup structure. 1979 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1980 Ctx->addDecl(UDir); 1981 else 1982 // Otherwise it is block-sope. using-directives will affect lookup 1983 // only to the end of scope. 1984 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1985} 1986 1987 1988Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1989 SourceLocation UsingLoc, 1990 const CXXScopeSpec &SS, 1991 SourceLocation IdentLoc, 1992 IdentifierInfo *TargetName, 1993 OverloadedOperatorKind Op, 1994 AttributeList *AttrList, 1995 bool IsTypeName) { 1996 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1997 assert((TargetName || Op) && "Invalid TargetName."); 1998 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1999 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2000 2001 UsingDecl *UsingAlias = 0; 2002 2003 DeclarationName Name; 2004 if (TargetName) 2005 Name = TargetName; 2006 else 2007 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2008 2009 // Lookup target name. 2010 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2011 2012 if (NamedDecl *NS = R) { 2013 if (IsTypeName && !isa<TypeDecl>(NS)) { 2014 Diag(IdentLoc, diag::err_using_typename_non_type); 2015 } 2016 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2017 NS->getLocation(), UsingLoc, NS, 2018 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2019 IsTypeName); 2020 PushOnScopeChains(UsingAlias, S); 2021 } else { 2022 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2023 } 2024 2025 // FIXME: We ignore attributes for now. 2026 delete AttrList; 2027 return DeclPtrTy::make(UsingAlias); 2028} 2029 2030/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2031/// is a namespace alias, returns the namespace it points to. 2032static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2033 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2034 return AD->getNamespace(); 2035 return dyn_cast_or_null<NamespaceDecl>(D); 2036} 2037 2038Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2039 SourceLocation NamespaceLoc, 2040 SourceLocation AliasLoc, 2041 IdentifierInfo *Alias, 2042 const CXXScopeSpec &SS, 2043 SourceLocation IdentLoc, 2044 IdentifierInfo *Ident) { 2045 2046 // Lookup the namespace name. 2047 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2048 2049 // Check if we have a previous declaration with the same name. 2050 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2051 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2052 // We already have an alias with the same name that points to the same 2053 // namespace, so don't create a new one. 2054 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2055 return DeclPtrTy(); 2056 } 2057 2058 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2059 diag::err_redefinition_different_kind; 2060 Diag(AliasLoc, DiagID) << Alias; 2061 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2062 return DeclPtrTy(); 2063 } 2064 2065 if (R.isAmbiguous()) { 2066 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2067 return DeclPtrTy(); 2068 } 2069 2070 if (!R) { 2071 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2072 return DeclPtrTy(); 2073 } 2074 2075 NamespaceAliasDecl *AliasDecl = 2076 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2077 Alias, SS.getRange(), 2078 (NestedNameSpecifier *)SS.getScopeRep(), 2079 IdentLoc, R); 2080 2081 CurContext->addDecl(AliasDecl); 2082 return DeclPtrTy::make(AliasDecl); 2083} 2084 2085void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2086 CXXConstructorDecl *Constructor) { 2087 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2088 !Constructor->isUsed()) && 2089 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2090 2091 CXXRecordDecl *ClassDecl 2092 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2093 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2094 // Before the implicitly-declared default constructor for a class is 2095 // implicitly defined, all the implicitly-declared default constructors 2096 // for its base class and its non-static data members shall have been 2097 // implicitly defined. 2098 bool err = false; 2099 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2100 E = ClassDecl->bases_end(); Base != E; ++Base) { 2101 CXXRecordDecl *BaseClassDecl 2102 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2103 if (!BaseClassDecl->hasTrivialConstructor()) { 2104 if (CXXConstructorDecl *BaseCtor = 2105 BaseClassDecl->getDefaultConstructor(Context)) 2106 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2107 else { 2108 Diag(CurrentLocation, diag::err_defining_default_ctor) 2109 << Context.getTagDeclType(ClassDecl) << 1 2110 << Context.getTagDeclType(BaseClassDecl); 2111 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2112 << Context.getTagDeclType(BaseClassDecl); 2113 err = true; 2114 } 2115 } 2116 } 2117 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2118 E = ClassDecl->field_end(); Field != E; ++Field) { 2119 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2120 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2121 FieldType = Array->getElementType(); 2122 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2123 CXXRecordDecl *FieldClassDecl 2124 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2125 if (!FieldClassDecl->hasTrivialConstructor()) { 2126 if (CXXConstructorDecl *FieldCtor = 2127 FieldClassDecl->getDefaultConstructor(Context)) 2128 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2129 else { 2130 Diag(CurrentLocation, diag::err_defining_default_ctor) 2131 << Context.getTagDeclType(ClassDecl) << 0 << 2132 Context.getTagDeclType(FieldClassDecl); 2133 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2134 << Context.getTagDeclType(FieldClassDecl); 2135 err = true; 2136 } 2137 } 2138 } 2139 else if (FieldType->isReferenceType()) { 2140 Diag(CurrentLocation, diag::err_unintialized_member) 2141 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2142 Diag((*Field)->getLocation(), diag::note_declared_at); 2143 err = true; 2144 } 2145 else if (FieldType.isConstQualified()) { 2146 Diag(CurrentLocation, diag::err_unintialized_member) 2147 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2148 Diag((*Field)->getLocation(), diag::note_declared_at); 2149 err = true; 2150 } 2151 } 2152 if (!err) 2153 Constructor->setUsed(); 2154 else 2155 Constructor->setInvalidDecl(); 2156} 2157 2158void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2159 CXXDestructorDecl *Destructor) { 2160 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2161 "DefineImplicitDestructor - call it for implicit default dtor"); 2162 2163 CXXRecordDecl *ClassDecl 2164 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2165 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2166 // C++ [class.dtor] p5 2167 // Before the implicitly-declared default destructor for a class is 2168 // implicitly defined, all the implicitly-declared default destructors 2169 // for its base class and its non-static data members shall have been 2170 // implicitly defined. 2171 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2172 E = ClassDecl->bases_end(); Base != E; ++Base) { 2173 CXXRecordDecl *BaseClassDecl 2174 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2175 if (!BaseClassDecl->hasTrivialDestructor()) { 2176 if (CXXDestructorDecl *BaseDtor = 2177 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2178 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2179 else 2180 assert(false && 2181 "DefineImplicitDestructor - missing dtor in a base class"); 2182 } 2183 } 2184 2185 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2186 E = ClassDecl->field_end(); Field != E; ++Field) { 2187 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2188 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2189 FieldType = Array->getElementType(); 2190 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2191 CXXRecordDecl *FieldClassDecl 2192 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2193 if (!FieldClassDecl->hasTrivialDestructor()) { 2194 if (CXXDestructorDecl *FieldDtor = 2195 const_cast<CXXDestructorDecl*>( 2196 FieldClassDecl->getDestructor(Context))) 2197 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2198 else 2199 assert(false && 2200 "DefineImplicitDestructor - missing dtor in class of a data member"); 2201 } 2202 } 2203 } 2204 Destructor->setUsed(); 2205} 2206 2207void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2208 CXXMethodDecl *MethodDecl) { 2209 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2210 MethodDecl->getOverloadedOperator() == OO_Equal && 2211 !MethodDecl->isUsed()) && 2212 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2213 2214 CXXRecordDecl *ClassDecl 2215 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2216 2217 // C++[class.copy] p12 2218 // Before the implicitly-declared copy assignment operator for a class is 2219 // implicitly defined, all implicitly-declared copy assignment operators 2220 // for its direct base classes and its nonstatic data members shall have 2221 // been implicitly defined. 2222 bool err = false; 2223 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2224 E = ClassDecl->bases_end(); Base != E; ++Base) { 2225 CXXRecordDecl *BaseClassDecl 2226 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2227 if (CXXMethodDecl *BaseAssignOpMethod = 2228 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2229 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2230 } 2231 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2232 E = ClassDecl->field_end(); Field != E; ++Field) { 2233 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2234 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2235 FieldType = Array->getElementType(); 2236 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2237 CXXRecordDecl *FieldClassDecl 2238 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2239 if (CXXMethodDecl *FieldAssignOpMethod = 2240 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2241 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2242 } 2243 else if (FieldType->isReferenceType()) { 2244 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2245 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2246 Diag(Field->getLocation(), diag::note_declared_at); 2247 Diag(CurrentLocation, diag::note_first_required_here); 2248 err = true; 2249 } 2250 else if (FieldType.isConstQualified()) { 2251 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2252 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2253 Diag(Field->getLocation(), diag::note_declared_at); 2254 Diag(CurrentLocation, diag::note_first_required_here); 2255 err = true; 2256 } 2257 } 2258 if (!err) 2259 MethodDecl->setUsed(); 2260} 2261 2262CXXMethodDecl * 2263Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2264 CXXRecordDecl *ClassDecl) { 2265 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2266 QualType RHSType(LHSType); 2267 // If class's assignment operator argument is const/volatile qualified, 2268 // look for operator = (const/volatile B&). Otherwise, look for 2269 // operator = (B&). 2270 if (ParmDecl->getType().isConstQualified()) 2271 RHSType.addConst(); 2272 if (ParmDecl->getType().isVolatileQualified()) 2273 RHSType.addVolatile(); 2274 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2275 LHSType, 2276 SourceLocation())); 2277 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2278 RHSType, 2279 SourceLocation())); 2280 Expr *Args[2] = { &*LHS, &*RHS }; 2281 OverloadCandidateSet CandidateSet; 2282 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2283 CandidateSet); 2284 OverloadCandidateSet::iterator Best; 2285 if (BestViableFunction(CandidateSet, 2286 ClassDecl->getLocation(), Best) == OR_Success) 2287 return cast<CXXMethodDecl>(Best->Function); 2288 assert(false && 2289 "getAssignOperatorMethod - copy assignment operator method not found"); 2290 return 0; 2291} 2292 2293void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2294 CXXConstructorDecl *CopyConstructor, 2295 unsigned TypeQuals) { 2296 assert((CopyConstructor->isImplicit() && 2297 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2298 !CopyConstructor->isUsed()) && 2299 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2300 2301 CXXRecordDecl *ClassDecl 2302 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2303 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2304 // C++ [class.copy] p209 2305 // Before the implicitly-declared copy constructor for a class is 2306 // implicitly defined, all the implicitly-declared copy constructors 2307 // for its base class and its non-static data members shall have been 2308 // implicitly defined. 2309 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2310 Base != ClassDecl->bases_end(); ++Base) { 2311 CXXRecordDecl *BaseClassDecl 2312 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2313 if (CXXConstructorDecl *BaseCopyCtor = 2314 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2315 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2316 } 2317 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2318 FieldEnd = ClassDecl->field_end(); 2319 Field != FieldEnd; ++Field) { 2320 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2321 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2322 FieldType = Array->getElementType(); 2323 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2324 CXXRecordDecl *FieldClassDecl 2325 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2326 if (CXXConstructorDecl *FieldCopyCtor = 2327 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2328 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2329 } 2330 } 2331 CopyConstructor->setUsed(); 2332} 2333 2334void Sema::InitializeVarWithConstructor(VarDecl *VD, 2335 CXXConstructorDecl *Constructor, 2336 QualType DeclInitType, 2337 Expr **Exprs, unsigned NumExprs) { 2338 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2339 false, Exprs, NumExprs); 2340 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2341 VD->setInit(Context, Temp); 2342} 2343 2344void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2345{ 2346 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2347 DeclInitType->getAsRecordType()->getDecl()); 2348 if (!ClassDecl->hasTrivialDestructor()) 2349 if (CXXDestructorDecl *Destructor = 2350 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2351 MarkDeclarationReferenced(Loc, Destructor); 2352} 2353 2354/// AddCXXDirectInitializerToDecl - This action is called immediately after 2355/// ActOnDeclarator, when a C++ direct initializer is present. 2356/// e.g: "int x(1);" 2357void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2358 SourceLocation LParenLoc, 2359 MultiExprArg Exprs, 2360 SourceLocation *CommaLocs, 2361 SourceLocation RParenLoc) { 2362 unsigned NumExprs = Exprs.size(); 2363 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2364 Decl *RealDecl = Dcl.getAs<Decl>(); 2365 2366 // If there is no declaration, there was an error parsing it. Just ignore 2367 // the initializer. 2368 if (RealDecl == 0) 2369 return; 2370 2371 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2372 if (!VDecl) { 2373 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2374 RealDecl->setInvalidDecl(); 2375 return; 2376 } 2377 2378 // FIXME: Need to handle dependent types and expressions here. 2379 2380 // We will treat direct-initialization as a copy-initialization: 2381 // int x(1); -as-> int x = 1; 2382 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2383 // 2384 // Clients that want to distinguish between the two forms, can check for 2385 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2386 // A major benefit is that clients that don't particularly care about which 2387 // exactly form was it (like the CodeGen) can handle both cases without 2388 // special case code. 2389 2390 // C++ 8.5p11: 2391 // The form of initialization (using parentheses or '=') is generally 2392 // insignificant, but does matter when the entity being initialized has a 2393 // class type. 2394 QualType DeclInitType = VDecl->getType(); 2395 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2396 DeclInitType = Array->getElementType(); 2397 2398 // FIXME: This isn't the right place to complete the type. 2399 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2400 diag::err_typecheck_decl_incomplete_type)) { 2401 VDecl->setInvalidDecl(); 2402 return; 2403 } 2404 2405 if (VDecl->getType()->isRecordType()) { 2406 CXXConstructorDecl *Constructor 2407 = PerformInitializationByConstructor(DeclInitType, 2408 (Expr **)Exprs.get(), NumExprs, 2409 VDecl->getLocation(), 2410 SourceRange(VDecl->getLocation(), 2411 RParenLoc), 2412 VDecl->getDeclName(), 2413 IK_Direct); 2414 if (!Constructor) 2415 RealDecl->setInvalidDecl(); 2416 else { 2417 VDecl->setCXXDirectInitializer(true); 2418 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2419 (Expr**)Exprs.release(), NumExprs); 2420 // FIXME. Must do all that is needed to destroy the object 2421 // on scope exit. For now, just mark the destructor as used. 2422 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2423 } 2424 return; 2425 } 2426 2427 if (NumExprs > 1) { 2428 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2429 << SourceRange(VDecl->getLocation(), RParenLoc); 2430 RealDecl->setInvalidDecl(); 2431 return; 2432 } 2433 2434 // Let clients know that initialization was done with a direct initializer. 2435 VDecl->setCXXDirectInitializer(true); 2436 2437 assert(NumExprs == 1 && "Expected 1 expression"); 2438 // Set the init expression, handles conversions. 2439 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2440 /*DirectInit=*/true); 2441} 2442 2443/// PerformInitializationByConstructor - Perform initialization by 2444/// constructor (C++ [dcl.init]p14), which may occur as part of 2445/// direct-initialization or copy-initialization. We are initializing 2446/// an object of type @p ClassType with the given arguments @p 2447/// Args. @p Loc is the location in the source code where the 2448/// initializer occurs (e.g., a declaration, member initializer, 2449/// functional cast, etc.) while @p Range covers the whole 2450/// initialization. @p InitEntity is the entity being initialized, 2451/// which may by the name of a declaration or a type. @p Kind is the 2452/// kind of initialization we're performing, which affects whether 2453/// explicit constructors will be considered. When successful, returns 2454/// the constructor that will be used to perform the initialization; 2455/// when the initialization fails, emits a diagnostic and returns 2456/// null. 2457CXXConstructorDecl * 2458Sema::PerformInitializationByConstructor(QualType ClassType, 2459 Expr **Args, unsigned NumArgs, 2460 SourceLocation Loc, SourceRange Range, 2461 DeclarationName InitEntity, 2462 InitializationKind Kind) { 2463 const RecordType *ClassRec = ClassType->getAsRecordType(); 2464 assert(ClassRec && "Can only initialize a class type here"); 2465 2466 // C++ [dcl.init]p14: 2467 // 2468 // If the initialization is direct-initialization, or if it is 2469 // copy-initialization where the cv-unqualified version of the 2470 // source type is the same class as, or a derived class of, the 2471 // class of the destination, constructors are considered. The 2472 // applicable constructors are enumerated (13.3.1.3), and the 2473 // best one is chosen through overload resolution (13.3). The 2474 // constructor so selected is called to initialize the object, 2475 // with the initializer expression(s) as its argument(s). If no 2476 // constructor applies, or the overload resolution is ambiguous, 2477 // the initialization is ill-formed. 2478 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2479 OverloadCandidateSet CandidateSet; 2480 2481 // Add constructors to the overload set. 2482 DeclarationName ConstructorName 2483 = Context.DeclarationNames.getCXXConstructorName( 2484 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2485 DeclContext::lookup_const_iterator Con, ConEnd; 2486 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2487 Con != ConEnd; ++Con) { 2488 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2489 if ((Kind == IK_Direct) || 2490 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2491 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2492 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2493 } 2494 2495 // FIXME: When we decide not to synthesize the implicitly-declared 2496 // constructors, we'll need to make them appear here. 2497 2498 OverloadCandidateSet::iterator Best; 2499 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2500 case OR_Success: 2501 // We found a constructor. Return it. 2502 return cast<CXXConstructorDecl>(Best->Function); 2503 2504 case OR_No_Viable_Function: 2505 if (InitEntity) 2506 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2507 << InitEntity << Range; 2508 else 2509 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2510 << ClassType << Range; 2511 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2512 return 0; 2513 2514 case OR_Ambiguous: 2515 if (InitEntity) 2516 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2517 else 2518 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2519 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2520 return 0; 2521 2522 case OR_Deleted: 2523 if (InitEntity) 2524 Diag(Loc, diag::err_ovl_deleted_init) 2525 << Best->Function->isDeleted() 2526 << InitEntity << Range; 2527 else 2528 Diag(Loc, diag::err_ovl_deleted_init) 2529 << Best->Function->isDeleted() 2530 << InitEntity << Range; 2531 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2532 return 0; 2533 } 2534 2535 return 0; 2536} 2537 2538/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2539/// determine whether they are reference-related, 2540/// reference-compatible, reference-compatible with added 2541/// qualification, or incompatible, for use in C++ initialization by 2542/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2543/// type, and the first type (T1) is the pointee type of the reference 2544/// type being initialized. 2545Sema::ReferenceCompareResult 2546Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2547 bool& DerivedToBase) { 2548 assert(!T1->isReferenceType() && 2549 "T1 must be the pointee type of the reference type"); 2550 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2551 2552 T1 = Context.getCanonicalType(T1); 2553 T2 = Context.getCanonicalType(T2); 2554 QualType UnqualT1 = T1.getUnqualifiedType(); 2555 QualType UnqualT2 = T2.getUnqualifiedType(); 2556 2557 // C++ [dcl.init.ref]p4: 2558 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2559 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2560 // T1 is a base class of T2. 2561 if (UnqualT1 == UnqualT2) 2562 DerivedToBase = false; 2563 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2564 DerivedToBase = true; 2565 else 2566 return Ref_Incompatible; 2567 2568 // At this point, we know that T1 and T2 are reference-related (at 2569 // least). 2570 2571 // C++ [dcl.init.ref]p4: 2572 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2573 // reference-related to T2 and cv1 is the same cv-qualification 2574 // as, or greater cv-qualification than, cv2. For purposes of 2575 // overload resolution, cases for which cv1 is greater 2576 // cv-qualification than cv2 are identified as 2577 // reference-compatible with added qualification (see 13.3.3.2). 2578 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2579 return Ref_Compatible; 2580 else if (T1.isMoreQualifiedThan(T2)) 2581 return Ref_Compatible_With_Added_Qualification; 2582 else 2583 return Ref_Related; 2584} 2585 2586/// CheckReferenceInit - Check the initialization of a reference 2587/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2588/// the initializer (either a simple initializer or an initializer 2589/// list), and DeclType is the type of the declaration. When ICS is 2590/// non-null, this routine will compute the implicit conversion 2591/// sequence according to C++ [over.ics.ref] and will not produce any 2592/// diagnostics; when ICS is null, it will emit diagnostics when any 2593/// errors are found. Either way, a return value of true indicates 2594/// that there was a failure, a return value of false indicates that 2595/// the reference initialization succeeded. 2596/// 2597/// When @p SuppressUserConversions, user-defined conversions are 2598/// suppressed. 2599/// When @p AllowExplicit, we also permit explicit user-defined 2600/// conversion functions. 2601/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2602bool 2603Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2604 ImplicitConversionSequence *ICS, 2605 bool SuppressUserConversions, 2606 bool AllowExplicit, bool ForceRValue) { 2607 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2608 2609 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2610 QualType T2 = Init->getType(); 2611 2612 // If the initializer is the address of an overloaded function, try 2613 // to resolve the overloaded function. If all goes well, T2 is the 2614 // type of the resulting function. 2615 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2616 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2617 ICS != 0); 2618 if (Fn) { 2619 // Since we're performing this reference-initialization for 2620 // real, update the initializer with the resulting function. 2621 if (!ICS) { 2622 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2623 return true; 2624 2625 FixOverloadedFunctionReference(Init, Fn); 2626 } 2627 2628 T2 = Fn->getType(); 2629 } 2630 } 2631 2632 // Compute some basic properties of the types and the initializer. 2633 bool isRValRef = DeclType->isRValueReferenceType(); 2634 bool DerivedToBase = false; 2635 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2636 Init->isLvalue(Context); 2637 ReferenceCompareResult RefRelationship 2638 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2639 2640 // Most paths end in a failed conversion. 2641 if (ICS) 2642 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2643 2644 // C++ [dcl.init.ref]p5: 2645 // A reference to type “cv1 T1” is initialized by an expression 2646 // of type “cv2 T2” as follows: 2647 2648 // -- If the initializer expression 2649 2650 // Rvalue references cannot bind to lvalues (N2812). 2651 // There is absolutely no situation where they can. In particular, note that 2652 // this is ill-formed, even if B has a user-defined conversion to A&&: 2653 // B b; 2654 // A&& r = b; 2655 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2656 if (!ICS) 2657 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2658 << Init->getSourceRange(); 2659 return true; 2660 } 2661 2662 bool BindsDirectly = false; 2663 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2664 // reference-compatible with “cv2 T2,” or 2665 // 2666 // Note that the bit-field check is skipped if we are just computing 2667 // the implicit conversion sequence (C++ [over.best.ics]p2). 2668 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2669 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2670 BindsDirectly = true; 2671 2672 if (ICS) { 2673 // C++ [over.ics.ref]p1: 2674 // When a parameter of reference type binds directly (8.5.3) 2675 // to an argument expression, the implicit conversion sequence 2676 // is the identity conversion, unless the argument expression 2677 // has a type that is a derived class of the parameter type, 2678 // in which case the implicit conversion sequence is a 2679 // derived-to-base Conversion (13.3.3.1). 2680 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2681 ICS->Standard.First = ICK_Identity; 2682 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2683 ICS->Standard.Third = ICK_Identity; 2684 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2685 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2686 ICS->Standard.ReferenceBinding = true; 2687 ICS->Standard.DirectBinding = true; 2688 ICS->Standard.RRefBinding = false; 2689 ICS->Standard.CopyConstructor = 0; 2690 2691 // Nothing more to do: the inaccessibility/ambiguity check for 2692 // derived-to-base conversions is suppressed when we're 2693 // computing the implicit conversion sequence (C++ 2694 // [over.best.ics]p2). 2695 return false; 2696 } else { 2697 // Perform the conversion. 2698 // FIXME: Binding to a subobject of the lvalue is going to require more 2699 // AST annotation than this. 2700 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2701 } 2702 } 2703 2704 // -- has a class type (i.e., T2 is a class type) and can be 2705 // implicitly converted to an lvalue of type “cv3 T3,” 2706 // where “cv1 T1” is reference-compatible with “cv3 T3” 2707 // 92) (this conversion is selected by enumerating the 2708 // applicable conversion functions (13.3.1.6) and choosing 2709 // the best one through overload resolution (13.3)), 2710 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2711 // FIXME: Look for conversions in base classes! 2712 CXXRecordDecl *T2RecordDecl 2713 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2714 2715 OverloadCandidateSet CandidateSet; 2716 OverloadedFunctionDecl *Conversions 2717 = T2RecordDecl->getConversionFunctions(); 2718 for (OverloadedFunctionDecl::function_iterator Func 2719 = Conversions->function_begin(); 2720 Func != Conversions->function_end(); ++Func) { 2721 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2722 2723 // If the conversion function doesn't return a reference type, 2724 // it can't be considered for this conversion. 2725 if (Conv->getConversionType()->isLValueReferenceType() && 2726 (AllowExplicit || !Conv->isExplicit())) 2727 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2728 } 2729 2730 OverloadCandidateSet::iterator Best; 2731 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2732 case OR_Success: 2733 // This is a direct binding. 2734 BindsDirectly = true; 2735 2736 if (ICS) { 2737 // C++ [over.ics.ref]p1: 2738 // 2739 // [...] If the parameter binds directly to the result of 2740 // applying a conversion function to the argument 2741 // expression, the implicit conversion sequence is a 2742 // user-defined conversion sequence (13.3.3.1.2), with the 2743 // second standard conversion sequence either an identity 2744 // conversion or, if the conversion function returns an 2745 // entity of a type that is a derived class of the parameter 2746 // type, a derived-to-base Conversion. 2747 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2748 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2749 ICS->UserDefined.After = Best->FinalConversion; 2750 ICS->UserDefined.ConversionFunction = Best->Function; 2751 assert(ICS->UserDefined.After.ReferenceBinding && 2752 ICS->UserDefined.After.DirectBinding && 2753 "Expected a direct reference binding!"); 2754 return false; 2755 } else { 2756 // Perform the conversion. 2757 // FIXME: Binding to a subobject of the lvalue is going to require more 2758 // AST annotation than this. 2759 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2760 } 2761 break; 2762 2763 case OR_Ambiguous: 2764 assert(false && "Ambiguous reference binding conversions not implemented."); 2765 return true; 2766 2767 case OR_No_Viable_Function: 2768 case OR_Deleted: 2769 // There was no suitable conversion, or we found a deleted 2770 // conversion; continue with other checks. 2771 break; 2772 } 2773 } 2774 2775 if (BindsDirectly) { 2776 // C++ [dcl.init.ref]p4: 2777 // [...] In all cases where the reference-related or 2778 // reference-compatible relationship of two types is used to 2779 // establish the validity of a reference binding, and T1 is a 2780 // base class of T2, a program that necessitates such a binding 2781 // is ill-formed if T1 is an inaccessible (clause 11) or 2782 // ambiguous (10.2) base class of T2. 2783 // 2784 // Note that we only check this condition when we're allowed to 2785 // complain about errors, because we should not be checking for 2786 // ambiguity (or inaccessibility) unless the reference binding 2787 // actually happens. 2788 if (DerivedToBase) 2789 return CheckDerivedToBaseConversion(T2, T1, 2790 Init->getSourceRange().getBegin(), 2791 Init->getSourceRange()); 2792 else 2793 return false; 2794 } 2795 2796 // -- Otherwise, the reference shall be to a non-volatile const 2797 // type (i.e., cv1 shall be const), or the reference shall be an 2798 // rvalue reference and the initializer expression shall be an rvalue. 2799 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2800 if (!ICS) 2801 Diag(Init->getSourceRange().getBegin(), 2802 diag::err_not_reference_to_const_init) 2803 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2804 << T2 << Init->getSourceRange(); 2805 return true; 2806 } 2807 2808 // -- If the initializer expression is an rvalue, with T2 a 2809 // class type, and “cv1 T1” is reference-compatible with 2810 // “cv2 T2,” the reference is bound in one of the 2811 // following ways (the choice is implementation-defined): 2812 // 2813 // -- The reference is bound to the object represented by 2814 // the rvalue (see 3.10) or to a sub-object within that 2815 // object. 2816 // 2817 // -- A temporary of type “cv1 T2” [sic] is created, and 2818 // a constructor is called to copy the entire rvalue 2819 // object into the temporary. The reference is bound to 2820 // the temporary or to a sub-object within the 2821 // temporary. 2822 // 2823 // The constructor that would be used to make the copy 2824 // shall be callable whether or not the copy is actually 2825 // done. 2826 // 2827 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2828 // freedom, so we will always take the first option and never build 2829 // a temporary in this case. FIXME: We will, however, have to check 2830 // for the presence of a copy constructor in C++98/03 mode. 2831 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2832 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2833 if (ICS) { 2834 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2835 ICS->Standard.First = ICK_Identity; 2836 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2837 ICS->Standard.Third = ICK_Identity; 2838 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2839 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2840 ICS->Standard.ReferenceBinding = true; 2841 ICS->Standard.DirectBinding = false; 2842 ICS->Standard.RRefBinding = isRValRef; 2843 ICS->Standard.CopyConstructor = 0; 2844 } else { 2845 // FIXME: Binding to a subobject of the rvalue is going to require more 2846 // AST annotation than this. 2847 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2848 } 2849 return false; 2850 } 2851 2852 // -- Otherwise, a temporary of type “cv1 T1” is created and 2853 // initialized from the initializer expression using the 2854 // rules for a non-reference copy initialization (8.5). The 2855 // reference is then bound to the temporary. If T1 is 2856 // reference-related to T2, cv1 must be the same 2857 // cv-qualification as, or greater cv-qualification than, 2858 // cv2; otherwise, the program is ill-formed. 2859 if (RefRelationship == Ref_Related) { 2860 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2861 // we would be reference-compatible or reference-compatible with 2862 // added qualification. But that wasn't the case, so the reference 2863 // initialization fails. 2864 if (!ICS) 2865 Diag(Init->getSourceRange().getBegin(), 2866 diag::err_reference_init_drops_quals) 2867 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2868 << T2 << Init->getSourceRange(); 2869 return true; 2870 } 2871 2872 // If at least one of the types is a class type, the types are not 2873 // related, and we aren't allowed any user conversions, the 2874 // reference binding fails. This case is important for breaking 2875 // recursion, since TryImplicitConversion below will attempt to 2876 // create a temporary through the use of a copy constructor. 2877 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2878 (T1->isRecordType() || T2->isRecordType())) { 2879 if (!ICS) 2880 Diag(Init->getSourceRange().getBegin(), 2881 diag::err_typecheck_convert_incompatible) 2882 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2883 return true; 2884 } 2885 2886 // Actually try to convert the initializer to T1. 2887 if (ICS) { 2888 // C++ [over.ics.ref]p2: 2889 // 2890 // When a parameter of reference type is not bound directly to 2891 // an argument expression, the conversion sequence is the one 2892 // required to convert the argument expression to the 2893 // underlying type of the reference according to 2894 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2895 // to copy-initializing a temporary of the underlying type with 2896 // the argument expression. Any difference in top-level 2897 // cv-qualification is subsumed by the initialization itself 2898 // and does not constitute a conversion. 2899 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2900 // Of course, that's still a reference binding. 2901 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2902 ICS->Standard.ReferenceBinding = true; 2903 ICS->Standard.RRefBinding = isRValRef; 2904 } else if(ICS->ConversionKind == 2905 ImplicitConversionSequence::UserDefinedConversion) { 2906 ICS->UserDefined.After.ReferenceBinding = true; 2907 ICS->UserDefined.After.RRefBinding = isRValRef; 2908 } 2909 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2910 } else { 2911 return PerformImplicitConversion(Init, T1, "initializing"); 2912 } 2913} 2914 2915/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2916/// of this overloaded operator is well-formed. If so, returns false; 2917/// otherwise, emits appropriate diagnostics and returns true. 2918bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2919 assert(FnDecl && FnDecl->isOverloadedOperator() && 2920 "Expected an overloaded operator declaration"); 2921 2922 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2923 2924 // C++ [over.oper]p5: 2925 // The allocation and deallocation functions, operator new, 2926 // operator new[], operator delete and operator delete[], are 2927 // described completely in 3.7.3. The attributes and restrictions 2928 // found in the rest of this subclause do not apply to them unless 2929 // explicitly stated in 3.7.3. 2930 // FIXME: Write a separate routine for checking this. For now, just allow it. 2931 if (Op == OO_New || Op == OO_Array_New || 2932 Op == OO_Delete || Op == OO_Array_Delete) 2933 return false; 2934 2935 // C++ [over.oper]p6: 2936 // An operator function shall either be a non-static member 2937 // function or be a non-member function and have at least one 2938 // parameter whose type is a class, a reference to a class, an 2939 // enumeration, or a reference to an enumeration. 2940 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2941 if (MethodDecl->isStatic()) 2942 return Diag(FnDecl->getLocation(), 2943 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2944 } else { 2945 bool ClassOrEnumParam = false; 2946 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2947 ParamEnd = FnDecl->param_end(); 2948 Param != ParamEnd; ++Param) { 2949 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2950 if (ParamType->isDependentType() || ParamType->isRecordType() || 2951 ParamType->isEnumeralType()) { 2952 ClassOrEnumParam = true; 2953 break; 2954 } 2955 } 2956 2957 if (!ClassOrEnumParam) 2958 return Diag(FnDecl->getLocation(), 2959 diag::err_operator_overload_needs_class_or_enum) 2960 << FnDecl->getDeclName(); 2961 } 2962 2963 // C++ [over.oper]p8: 2964 // An operator function cannot have default arguments (8.3.6), 2965 // except where explicitly stated below. 2966 // 2967 // Only the function-call operator allows default arguments 2968 // (C++ [over.call]p1). 2969 if (Op != OO_Call) { 2970 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2971 Param != FnDecl->param_end(); ++Param) { 2972 if ((*Param)->hasUnparsedDefaultArg()) 2973 return Diag((*Param)->getLocation(), 2974 diag::err_operator_overload_default_arg) 2975 << FnDecl->getDeclName(); 2976 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2977 return Diag((*Param)->getLocation(), 2978 diag::err_operator_overload_default_arg) 2979 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2980 } 2981 } 2982 2983 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2984 { false, false, false } 2985#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2986 , { Unary, Binary, MemberOnly } 2987#include "clang/Basic/OperatorKinds.def" 2988 }; 2989 2990 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2991 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2992 bool MustBeMemberOperator = OperatorUses[Op][2]; 2993 2994 // C++ [over.oper]p8: 2995 // [...] Operator functions cannot have more or fewer parameters 2996 // than the number required for the corresponding operator, as 2997 // described in the rest of this subclause. 2998 unsigned NumParams = FnDecl->getNumParams() 2999 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3000 if (Op != OO_Call && 3001 ((NumParams == 1 && !CanBeUnaryOperator) || 3002 (NumParams == 2 && !CanBeBinaryOperator) || 3003 (NumParams < 1) || (NumParams > 2))) { 3004 // We have the wrong number of parameters. 3005 unsigned ErrorKind; 3006 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3007 ErrorKind = 2; // 2 -> unary or binary. 3008 } else if (CanBeUnaryOperator) { 3009 ErrorKind = 0; // 0 -> unary 3010 } else { 3011 assert(CanBeBinaryOperator && 3012 "All non-call overloaded operators are unary or binary!"); 3013 ErrorKind = 1; // 1 -> binary 3014 } 3015 3016 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3017 << FnDecl->getDeclName() << NumParams << ErrorKind; 3018 } 3019 3020 // Overloaded operators other than operator() cannot be variadic. 3021 if (Op != OO_Call && 3022 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3023 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3024 << FnDecl->getDeclName(); 3025 } 3026 3027 // Some operators must be non-static member functions. 3028 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3029 return Diag(FnDecl->getLocation(), 3030 diag::err_operator_overload_must_be_member) 3031 << FnDecl->getDeclName(); 3032 } 3033 3034 // C++ [over.inc]p1: 3035 // The user-defined function called operator++ implements the 3036 // prefix and postfix ++ operator. If this function is a member 3037 // function with no parameters, or a non-member function with one 3038 // parameter of class or enumeration type, it defines the prefix 3039 // increment operator ++ for objects of that type. If the function 3040 // is a member function with one parameter (which shall be of type 3041 // int) or a non-member function with two parameters (the second 3042 // of which shall be of type int), it defines the postfix 3043 // increment operator ++ for objects of that type. 3044 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3045 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3046 bool ParamIsInt = false; 3047 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3048 ParamIsInt = BT->getKind() == BuiltinType::Int; 3049 3050 if (!ParamIsInt) 3051 return Diag(LastParam->getLocation(), 3052 diag::err_operator_overload_post_incdec_must_be_int) 3053 << LastParam->getType() << (Op == OO_MinusMinus); 3054 } 3055 3056 // Notify the class if it got an assignment operator. 3057 if (Op == OO_Equal) { 3058 // Would have returned earlier otherwise. 3059 assert(isa<CXXMethodDecl>(FnDecl) && 3060 "Overloaded = not member, but not filtered."); 3061 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3062 Method->getParent()->addedAssignmentOperator(Context, Method); 3063 } 3064 3065 return false; 3066} 3067 3068/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3069/// linkage specification, including the language and (if present) 3070/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3071/// the location of the language string literal, which is provided 3072/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3073/// the '{' brace. Otherwise, this linkage specification does not 3074/// have any braces. 3075Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3076 SourceLocation ExternLoc, 3077 SourceLocation LangLoc, 3078 const char *Lang, 3079 unsigned StrSize, 3080 SourceLocation LBraceLoc) { 3081 LinkageSpecDecl::LanguageIDs Language; 3082 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3083 Language = LinkageSpecDecl::lang_c; 3084 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3085 Language = LinkageSpecDecl::lang_cxx; 3086 else { 3087 Diag(LangLoc, diag::err_bad_language); 3088 return DeclPtrTy(); 3089 } 3090 3091 // FIXME: Add all the various semantics of linkage specifications 3092 3093 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3094 LangLoc, Language, 3095 LBraceLoc.isValid()); 3096 CurContext->addDecl(D); 3097 PushDeclContext(S, D); 3098 return DeclPtrTy::make(D); 3099} 3100 3101/// ActOnFinishLinkageSpecification - Completely the definition of 3102/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3103/// valid, it's the position of the closing '}' brace in a linkage 3104/// specification that uses braces. 3105Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3106 DeclPtrTy LinkageSpec, 3107 SourceLocation RBraceLoc) { 3108 if (LinkageSpec) 3109 PopDeclContext(); 3110 return LinkageSpec; 3111} 3112 3113/// \brief Perform semantic analysis for the variable declaration that 3114/// occurs within a C++ catch clause, returning the newly-created 3115/// variable. 3116VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3117 IdentifierInfo *Name, 3118 SourceLocation Loc, 3119 SourceRange Range) { 3120 bool Invalid = false; 3121 3122 // Arrays and functions decay. 3123 if (ExDeclType->isArrayType()) 3124 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3125 else if (ExDeclType->isFunctionType()) 3126 ExDeclType = Context.getPointerType(ExDeclType); 3127 3128 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3129 // The exception-declaration shall not denote a pointer or reference to an 3130 // incomplete type, other than [cv] void*. 3131 // N2844 forbids rvalue references. 3132 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3133 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3134 Invalid = true; 3135 } 3136 3137 QualType BaseType = ExDeclType; 3138 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3139 unsigned DK = diag::err_catch_incomplete; 3140 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 3141 BaseType = Ptr->getPointeeType(); 3142 Mode = 1; 3143 DK = diag::err_catch_incomplete_ptr; 3144 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3145 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3146 BaseType = Ref->getPointeeType(); 3147 Mode = 2; 3148 DK = diag::err_catch_incomplete_ref; 3149 } 3150 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3151 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3152 Invalid = true; 3153 3154 if (!Invalid && !ExDeclType->isDependentType() && 3155 RequireNonAbstractType(Loc, ExDeclType, 3156 diag::err_abstract_type_in_decl, 3157 AbstractVariableType)) 3158 Invalid = true; 3159 3160 // FIXME: Need to test for ability to copy-construct and destroy the 3161 // exception variable. 3162 3163 // FIXME: Need to check for abstract classes. 3164 3165 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3166 Name, ExDeclType, VarDecl::None, 3167 Range.getBegin()); 3168 3169 if (Invalid) 3170 ExDecl->setInvalidDecl(); 3171 3172 return ExDecl; 3173} 3174 3175/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3176/// handler. 3177Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3178 QualType ExDeclType = GetTypeForDeclarator(D, S); 3179 3180 bool Invalid = D.isInvalidType(); 3181 IdentifierInfo *II = D.getIdentifier(); 3182 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3183 // The scope should be freshly made just for us. There is just no way 3184 // it contains any previous declaration. 3185 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3186 if (PrevDecl->isTemplateParameter()) { 3187 // Maybe we will complain about the shadowed template parameter. 3188 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3189 } 3190 } 3191 3192 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3193 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3194 << D.getCXXScopeSpec().getRange(); 3195 Invalid = true; 3196 } 3197 3198 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3199 D.getIdentifier(), 3200 D.getIdentifierLoc(), 3201 D.getDeclSpec().getSourceRange()); 3202 3203 if (Invalid) 3204 ExDecl->setInvalidDecl(); 3205 3206 // Add the exception declaration into this scope. 3207 if (II) 3208 PushOnScopeChains(ExDecl, S); 3209 else 3210 CurContext->addDecl(ExDecl); 3211 3212 ProcessDeclAttributes(S, ExDecl, D); 3213 return DeclPtrTy::make(ExDecl); 3214} 3215 3216Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3217 ExprArg assertexpr, 3218 ExprArg assertmessageexpr) { 3219 Expr *AssertExpr = (Expr *)assertexpr.get(); 3220 StringLiteral *AssertMessage = 3221 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3222 3223 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3224 llvm::APSInt Value(32); 3225 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3226 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3227 AssertExpr->getSourceRange(); 3228 return DeclPtrTy(); 3229 } 3230 3231 if (Value == 0) { 3232 std::string str(AssertMessage->getStrData(), 3233 AssertMessage->getByteLength()); 3234 Diag(AssertLoc, diag::err_static_assert_failed) 3235 << str << AssertExpr->getSourceRange(); 3236 } 3237 } 3238 3239 assertexpr.release(); 3240 assertmessageexpr.release(); 3241 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3242 AssertExpr, AssertMessage); 3243 3244 CurContext->addDecl(Decl); 3245 return DeclPtrTy::make(Decl); 3246} 3247 3248bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3249 if (!(S->getFlags() & Scope::ClassScope)) { 3250 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3251 return true; 3252 } 3253 3254 return false; 3255} 3256 3257void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3258 Decl *Dcl = dcl.getAs<Decl>(); 3259 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3260 if (!Fn) { 3261 Diag(DelLoc, diag::err_deleted_non_function); 3262 return; 3263 } 3264 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3265 Diag(DelLoc, diag::err_deleted_decl_not_first); 3266 Diag(Prev->getLocation(), diag::note_previous_declaration); 3267 // If the declaration wasn't the first, we delete the function anyway for 3268 // recovery. 3269 } 3270 Fn->setDeleted(); 3271} 3272 3273static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3274 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3275 ++CI) { 3276 Stmt *SubStmt = *CI; 3277 if (!SubStmt) 3278 continue; 3279 if (isa<ReturnStmt>(SubStmt)) 3280 Self.Diag(SubStmt->getSourceRange().getBegin(), 3281 diag::err_return_in_constructor_handler); 3282 if (!isa<Expr>(SubStmt)) 3283 SearchForReturnInStmt(Self, SubStmt); 3284 } 3285} 3286 3287void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3288 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3289 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3290 SearchForReturnInStmt(*this, Handler); 3291 } 3292} 3293 3294bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3295 const CXXMethodDecl *Old) { 3296 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3297 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3298 3299 QualType CNewTy = Context.getCanonicalType(NewTy); 3300 QualType COldTy = Context.getCanonicalType(OldTy); 3301 3302 if (CNewTy == COldTy && 3303 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3304 return false; 3305 3306 // Check if the return types are covariant 3307 QualType NewClassTy, OldClassTy; 3308 3309 /// Both types must be pointers or references to classes. 3310 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3311 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3312 NewClassTy = NewPT->getPointeeType(); 3313 OldClassTy = OldPT->getPointeeType(); 3314 } 3315 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3316 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3317 NewClassTy = NewRT->getPointeeType(); 3318 OldClassTy = OldRT->getPointeeType(); 3319 } 3320 } 3321 3322 // The return types aren't either both pointers or references to a class type. 3323 if (NewClassTy.isNull()) { 3324 Diag(New->getLocation(), 3325 diag::err_different_return_type_for_overriding_virtual_function) 3326 << New->getDeclName() << NewTy << OldTy; 3327 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3328 3329 return true; 3330 } 3331 3332 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3333 // Check if the new class derives from the old class. 3334 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3335 Diag(New->getLocation(), 3336 diag::err_covariant_return_not_derived) 3337 << New->getDeclName() << NewTy << OldTy; 3338 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3339 return true; 3340 } 3341 3342 // Check if we the conversion from derived to base is valid. 3343 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3344 diag::err_covariant_return_inaccessible_base, 3345 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3346 // FIXME: Should this point to the return type? 3347 New->getLocation(), SourceRange(), New->getDeclName())) { 3348 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3349 return true; 3350 } 3351 } 3352 3353 // The qualifiers of the return types must be the same. 3354 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3355 Diag(New->getLocation(), 3356 diag::err_covariant_return_type_different_qualifications) 3357 << New->getDeclName() << NewTy << OldTy; 3358 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3359 return true; 3360 }; 3361 3362 3363 // The new class type must have the same or less qualifiers as the old type. 3364 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3365 Diag(New->getLocation(), 3366 diag::err_covariant_return_type_class_type_more_qualified) 3367 << New->getDeclName() << NewTy << OldTy; 3368 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3369 return true; 3370 }; 3371 3372 return false; 3373} 3374 3375bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3376 const CXXMethodDecl *Old) 3377{ 3378 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3379 diag::note_overridden_virtual_function, 3380 Old->getType()->getAsFunctionProtoType(), 3381 Old->getLocation(), 3382 New->getType()->getAsFunctionProtoType(), 3383 New->getLocation()); 3384} 3385 3386/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3387/// initializer for the declaration 'Dcl'. 3388/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3389/// static data member of class X, names should be looked up in the scope of 3390/// class X. 3391void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3392 Decl *D = Dcl.getAs<Decl>(); 3393 // If there is no declaration, there was an error parsing it. 3394 if (D == 0) 3395 return; 3396 3397 // Check whether it is a declaration with a nested name specifier like 3398 // int foo::bar; 3399 if (!D->isOutOfLine()) 3400 return; 3401 3402 // C++ [basic.lookup.unqual]p13 3403 // 3404 // A name used in the definition of a static data member of class X 3405 // (after the qualified-id of the static member) is looked up as if the name 3406 // was used in a member function of X. 3407 3408 // Change current context into the context of the initializing declaration. 3409 EnterDeclaratorContext(S, D->getDeclContext()); 3410} 3411 3412/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3413/// initializer for the declaration 'Dcl'. 3414void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3415 Decl *D = Dcl.getAs<Decl>(); 3416 // If there is no declaration, there was an error parsing it. 3417 if (D == 0) 3418 return; 3419 3420 // Check whether it is a declaration with a nested name specifier like 3421 // int foo::bar; 3422 if (!D->isOutOfLine()) 3423 return; 3424 3425 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3426 ExitDeclaratorContext(S); 3427} 3428