SemaDeclCXX.cpp revision 2eeed7bc4fd457ac57ff32ab3b02674588545f65
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->getAs<RecordType>()->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 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 721 RParenLoc); 722 } 723 // It didn't name a member, so see if it names a class. 724 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 725 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 726 if (!BaseTy) 727 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 728 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 729 730 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 731 732 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 733 RParenLoc, ClassDecl); 734} 735 736Sema::MemInitResult 737Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 738 unsigned NumArgs, SourceLocation IdLoc, 739 SourceLocation RParenLoc) { 740 bool HasDependentArg = false; 741 for (unsigned i = 0; i < NumArgs; i++) 742 HasDependentArg |= Args[i]->isTypeDependent(); 743 744 CXXConstructorDecl *C = 0; 745 QualType FieldType = Member->getType(); 746 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 747 FieldType = Array->getElementType(); 748 if (FieldType->isDependentType()) { 749 // Can't check init for dependent type. 750 } else if (FieldType->getAs<RecordType>()) { 751 if (!HasDependentArg) 752 C = PerformInitializationByConstructor( 753 FieldType, (Expr **)Args, NumArgs, IdLoc, 754 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 755 } else if (NumArgs != 1) { 756 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 757 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 758 } else if (!HasDependentArg) { 759 Expr *NewExp = (Expr*)Args[0]; 760 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 761 return true; 762 Args[0] = NewExp; 763 } 764 // FIXME: Perform direct initialization of the member. 765 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 766 NumArgs, C, IdLoc); 767} 768 769Sema::MemInitResult 770Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 771 unsigned NumArgs, SourceLocation IdLoc, 772 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 773 bool HasDependentArg = false; 774 for (unsigned i = 0; i < NumArgs; i++) 775 HasDependentArg |= Args[i]->isTypeDependent(); 776 777 if (!BaseType->isDependentType()) { 778 if (!BaseType->isRecordType()) 779 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 780 << BaseType << SourceRange(IdLoc, RParenLoc); 781 782 // C++ [class.base.init]p2: 783 // [...] Unless the mem-initializer-id names a nonstatic data 784 // member of the constructor’s class or a direct or virtual base 785 // of that class, the mem-initializer is ill-formed. A 786 // mem-initializer-list can initialize a base class using any 787 // name that denotes that base class type. 788 789 // First, check for a direct base class. 790 const CXXBaseSpecifier *DirectBaseSpec = 0; 791 for (CXXRecordDecl::base_class_const_iterator Base = 792 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 793 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 794 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 795 // We found a direct base of this type. That's what we're 796 // initializing. 797 DirectBaseSpec = &*Base; 798 break; 799 } 800 } 801 802 // Check for a virtual base class. 803 // FIXME: We might be able to short-circuit this if we know in advance that 804 // there are no virtual bases. 805 const CXXBaseSpecifier *VirtualBaseSpec = 0; 806 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 807 // We haven't found a base yet; search the class hierarchy for a 808 // virtual base class. 809 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 810 /*DetectVirtual=*/false); 811 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 812 for (BasePaths::paths_iterator Path = Paths.begin(); 813 Path != Paths.end(); ++Path) { 814 if (Path->back().Base->isVirtual()) { 815 VirtualBaseSpec = Path->back().Base; 816 break; 817 } 818 } 819 } 820 } 821 822 // C++ [base.class.init]p2: 823 // If a mem-initializer-id is ambiguous because it designates both 824 // a direct non-virtual base class and an inherited virtual base 825 // class, the mem-initializer is ill-formed. 826 if (DirectBaseSpec && VirtualBaseSpec) 827 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 828 << BaseType << SourceRange(IdLoc, RParenLoc); 829 // C++ [base.class.init]p2: 830 // Unless the mem-initializer-id names a nonstatic data membeer of the 831 // constructor's class ot a direst or virtual base of that class, the 832 // mem-initializer is ill-formed. 833 if (!DirectBaseSpec && !VirtualBaseSpec) 834 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 835 << BaseType << ClassDecl->getNameAsCString() 836 << SourceRange(IdLoc, RParenLoc); 837 } 838 839 CXXConstructorDecl *C = 0; 840 if (!BaseType->isDependentType() && !HasDependentArg) { 841 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 842 Context.getCanonicalType(BaseType)); 843 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 844 IdLoc, SourceRange(IdLoc, RParenLoc), 845 Name, IK_Direct); 846 } 847 848 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 849 NumArgs, C, IdLoc); 850} 851 852void 853Sema::BuildBaseOrMemberInitializers(ASTContext &C, 854 CXXConstructorDecl *Constructor, 855 CXXBaseOrMemberInitializer **Initializers, 856 unsigned NumInitializers 857 ) { 858 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 859 llvm::SmallVector<FieldDecl *, 4>Members; 860 861 Constructor->setBaseOrMemberInitializers(C, 862 Initializers, NumInitializers, 863 Bases, Members); 864 for (unsigned int i = 0; i < Bases.size(); i++) 865 Diag(Bases[i]->getSourceRange().getBegin(), 866 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 867 for (unsigned int i = 0; i < Members.size(); i++) 868 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 869 << 1 << Members[i]->getType(); 870} 871 872static void *GetKeyForTopLevelField(FieldDecl *Field) { 873 // For anonymous unions, use the class declaration as the key. 874 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 875 if (RT->getDecl()->isAnonymousStructOrUnion()) 876 return static_cast<void *>(RT->getDecl()); 877 } 878 return static_cast<void *>(Field); 879} 880 881static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 882 // For fields injected into the class via declaration of an anonymous union, 883 // use its anonymous union class declaration as the unique key. 884 if (FieldDecl *Field = Member->getMember()) { 885 if (Field->getDeclContext()->isRecord()) { 886 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 887 if (RD->isAnonymousStructOrUnion()) 888 return static_cast<void *>(RD); 889 } 890 return static_cast<void *>(Field); 891 } 892 return static_cast<RecordType *>(Member->getBaseClass()); 893} 894 895void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 896 SourceLocation ColonLoc, 897 MemInitTy **MemInits, unsigned NumMemInits) { 898 if (!ConstructorDecl) 899 return; 900 901 CXXConstructorDecl *Constructor 902 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 903 904 if (!Constructor) { 905 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 906 return; 907 } 908 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 909 bool err = false; 910 for (unsigned i = 0; i < NumMemInits; i++) { 911 CXXBaseOrMemberInitializer *Member = 912 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 913 void *KeyToMember = GetKeyForMember(Member); 914 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 915 if (!PrevMember) { 916 PrevMember = Member; 917 continue; 918 } 919 if (FieldDecl *Field = Member->getMember()) 920 Diag(Member->getSourceLocation(), 921 diag::error_multiple_mem_initialization) 922 << Field->getNameAsString(); 923 else { 924 Type *BaseClass = Member->getBaseClass(); 925 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 926 Diag(Member->getSourceLocation(), 927 diag::error_multiple_base_initialization) 928 << BaseClass->getDesugaredType(true); 929 } 930 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 931 << 0; 932 err = true; 933 } 934 if (!err) 935 BuildBaseOrMemberInitializers(Context, Constructor, 936 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 937 NumMemInits); 938 939 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 940 != Diagnostic::Ignored || 941 Diags.getDiagnosticLevel(diag::warn_field_initialized) 942 != Diagnostic::Ignored)) { 943 // Also issue warning if order of ctor-initializer list does not match order 944 // of 1) base class declarations and 2) order of non-static data members. 945 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 946 947 CXXRecordDecl *ClassDecl 948 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 949 // Push virtual bases before others. 950 for (CXXRecordDecl::base_class_iterator VBase = 951 ClassDecl->vbases_begin(), 952 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 953 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 954 955 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 956 E = ClassDecl->bases_end(); Base != E; ++Base) { 957 // Virtuals are alread in the virtual base list and are constructed 958 // first. 959 if (Base->isVirtual()) 960 continue; 961 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 962 } 963 964 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 965 E = ClassDecl->field_end(); Field != E; ++Field) 966 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 967 968 int Last = AllBaseOrMembers.size(); 969 int curIndex = 0; 970 CXXBaseOrMemberInitializer *PrevMember = 0; 971 for (unsigned i = 0; i < NumMemInits; i++) { 972 CXXBaseOrMemberInitializer *Member = 973 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 974 void *MemberInCtorList = GetKeyForMember(Member); 975 976 for (; curIndex < Last; curIndex++) 977 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 978 break; 979 if (curIndex == Last) { 980 assert(PrevMember && "Member not in member list?!"); 981 // Initializer as specified in ctor-initializer list is out of order. 982 // Issue a warning diagnostic. 983 if (PrevMember->isBaseInitializer()) { 984 // Diagnostics is for an initialized base class. 985 Type *BaseClass = PrevMember->getBaseClass(); 986 Diag(PrevMember->getSourceLocation(), 987 diag::warn_base_initialized) 988 << BaseClass->getDesugaredType(true); 989 } else { 990 FieldDecl *Field = PrevMember->getMember(); 991 Diag(PrevMember->getSourceLocation(), 992 diag::warn_field_initialized) 993 << Field->getNameAsString(); 994 } 995 // Also the note! 996 if (FieldDecl *Field = Member->getMember()) 997 Diag(Member->getSourceLocation(), 998 diag::note_fieldorbase_initialized_here) << 0 999 << Field->getNameAsString(); 1000 else { 1001 Type *BaseClass = Member->getBaseClass(); 1002 Diag(Member->getSourceLocation(), 1003 diag::note_fieldorbase_initialized_here) << 1 1004 << BaseClass->getDesugaredType(true); 1005 } 1006 for (curIndex = 0; curIndex < Last; curIndex++) 1007 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1008 break; 1009 } 1010 PrevMember = Member; 1011 } 1012 } 1013} 1014 1015void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1016 if (!CDtorDecl) 1017 return; 1018 1019 if (CXXConstructorDecl *Constructor 1020 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1021 BuildBaseOrMemberInitializers(Context, 1022 Constructor, 1023 (CXXBaseOrMemberInitializer **)0, 0); 1024} 1025 1026namespace { 1027 /// PureVirtualMethodCollector - traverses a class and its superclasses 1028 /// and determines if it has any pure virtual methods. 1029 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1030 ASTContext &Context; 1031 1032 public: 1033 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1034 1035 private: 1036 MethodList Methods; 1037 1038 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1039 1040 public: 1041 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1042 : Context(Ctx) { 1043 1044 MethodList List; 1045 Collect(RD, List); 1046 1047 // Copy the temporary list to methods, and make sure to ignore any 1048 // null entries. 1049 for (size_t i = 0, e = List.size(); i != e; ++i) { 1050 if (List[i]) 1051 Methods.push_back(List[i]); 1052 } 1053 } 1054 1055 bool empty() const { return Methods.empty(); } 1056 1057 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1058 MethodList::const_iterator methods_end() { return Methods.end(); } 1059 }; 1060 1061 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1062 MethodList& Methods) { 1063 // First, collect the pure virtual methods for the base classes. 1064 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1065 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1066 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1067 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1068 if (BaseDecl && BaseDecl->isAbstract()) 1069 Collect(BaseDecl, Methods); 1070 } 1071 } 1072 1073 // Next, zero out any pure virtual methods that this class overrides. 1074 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1075 1076 MethodSetTy OverriddenMethods; 1077 size_t MethodsSize = Methods.size(); 1078 1079 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1080 i != e; ++i) { 1081 // Traverse the record, looking for methods. 1082 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1083 // If the method is pure virtual, add it to the methods vector. 1084 if (MD->isPure()) { 1085 Methods.push_back(MD); 1086 continue; 1087 } 1088 1089 // Otherwise, record all the overridden methods in our set. 1090 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1091 E = MD->end_overridden_methods(); I != E; ++I) { 1092 // Keep track of the overridden methods. 1093 OverriddenMethods.insert(*I); 1094 } 1095 } 1096 } 1097 1098 // Now go through the methods and zero out all the ones we know are 1099 // overridden. 1100 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1101 if (OverriddenMethods.count(Methods[i])) 1102 Methods[i] = 0; 1103 } 1104 1105 } 1106} 1107 1108bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1109 unsigned DiagID, AbstractDiagSelID SelID, 1110 const CXXRecordDecl *CurrentRD) { 1111 1112 if (!getLangOptions().CPlusPlus) 1113 return false; 1114 1115 if (const ArrayType *AT = Context.getAsArrayType(T)) 1116 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1117 CurrentRD); 1118 1119 if (const PointerType *PT = T->getAs<PointerType>()) { 1120 // Find the innermost pointer type. 1121 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1122 PT = T; 1123 1124 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1125 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1126 CurrentRD); 1127 } 1128 1129 const RecordType *RT = T->getAs<RecordType>(); 1130 if (!RT) 1131 return false; 1132 1133 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1134 if (!RD) 1135 return false; 1136 1137 if (CurrentRD && CurrentRD != RD) 1138 return false; 1139 1140 if (!RD->isAbstract()) 1141 return false; 1142 1143 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1144 1145 // Check if we've already emitted the list of pure virtual functions for this 1146 // class. 1147 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1148 return true; 1149 1150 PureVirtualMethodCollector Collector(Context, RD); 1151 1152 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1153 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1154 const CXXMethodDecl *MD = *I; 1155 1156 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1157 MD->getDeclName(); 1158 } 1159 1160 if (!PureVirtualClassDiagSet) 1161 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1162 PureVirtualClassDiagSet->insert(RD); 1163 1164 return true; 1165} 1166 1167namespace { 1168 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1169 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1170 Sema &SemaRef; 1171 CXXRecordDecl *AbstractClass; 1172 1173 bool VisitDeclContext(const DeclContext *DC) { 1174 bool Invalid = false; 1175 1176 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1177 E = DC->decls_end(); I != E; ++I) 1178 Invalid |= Visit(*I); 1179 1180 return Invalid; 1181 } 1182 1183 public: 1184 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1185 : SemaRef(SemaRef), AbstractClass(ac) { 1186 Visit(SemaRef.Context.getTranslationUnitDecl()); 1187 } 1188 1189 bool VisitFunctionDecl(const FunctionDecl *FD) { 1190 if (FD->isThisDeclarationADefinition()) { 1191 // No need to do the check if we're in a definition, because it requires 1192 // that the return/param types are complete. 1193 // because that requires 1194 return VisitDeclContext(FD); 1195 } 1196 1197 // Check the return type. 1198 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1199 bool Invalid = 1200 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1201 diag::err_abstract_type_in_decl, 1202 Sema::AbstractReturnType, 1203 AbstractClass); 1204 1205 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1206 E = FD->param_end(); I != E; ++I) { 1207 const ParmVarDecl *VD = *I; 1208 Invalid |= 1209 SemaRef.RequireNonAbstractType(VD->getLocation(), 1210 VD->getOriginalType(), 1211 diag::err_abstract_type_in_decl, 1212 Sema::AbstractParamType, 1213 AbstractClass); 1214 } 1215 1216 return Invalid; 1217 } 1218 1219 bool VisitDecl(const Decl* D) { 1220 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1221 return VisitDeclContext(DC); 1222 1223 return false; 1224 } 1225 }; 1226} 1227 1228void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1229 DeclPtrTy TagDecl, 1230 SourceLocation LBrac, 1231 SourceLocation RBrac) { 1232 if (!TagDecl) 1233 return; 1234 1235 AdjustDeclIfTemplate(TagDecl); 1236 ActOnFields(S, RLoc, TagDecl, 1237 (DeclPtrTy*)FieldCollector->getCurFields(), 1238 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1239 1240 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1241 if (!RD->isAbstract()) { 1242 // Collect all the pure virtual methods and see if this is an abstract 1243 // class after all. 1244 PureVirtualMethodCollector Collector(Context, RD); 1245 if (!Collector.empty()) 1246 RD->setAbstract(true); 1247 } 1248 1249 if (RD->isAbstract()) 1250 AbstractClassUsageDiagnoser(*this, RD); 1251 1252 if (!RD->isDependentType()) 1253 AddImplicitlyDeclaredMembersToClass(RD); 1254} 1255 1256/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1257/// special functions, such as the default constructor, copy 1258/// constructor, or destructor, to the given C++ class (C++ 1259/// [special]p1). This routine can only be executed just before the 1260/// definition of the class is complete. 1261void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1262 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1263 ClassType = Context.getCanonicalType(ClassType); 1264 1265 // FIXME: Implicit declarations have exception specifications, which are 1266 // the union of the specifications of the implicitly called functions. 1267 1268 if (!ClassDecl->hasUserDeclaredConstructor()) { 1269 // C++ [class.ctor]p5: 1270 // A default constructor for a class X is a constructor of class X 1271 // that can be called without an argument. If there is no 1272 // user-declared constructor for class X, a default constructor is 1273 // implicitly declared. An implicitly-declared default constructor 1274 // is an inline public member of its class. 1275 DeclarationName Name 1276 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1277 CXXConstructorDecl *DefaultCon = 1278 CXXConstructorDecl::Create(Context, ClassDecl, 1279 ClassDecl->getLocation(), Name, 1280 Context.getFunctionType(Context.VoidTy, 1281 0, 0, false, 0), 1282 /*isExplicit=*/false, 1283 /*isInline=*/true, 1284 /*isImplicitlyDeclared=*/true); 1285 DefaultCon->setAccess(AS_public); 1286 DefaultCon->setImplicit(); 1287 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1288 ClassDecl->addDecl(DefaultCon); 1289 } 1290 1291 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1292 // C++ [class.copy]p4: 1293 // If the class definition does not explicitly declare a copy 1294 // constructor, one is declared implicitly. 1295 1296 // C++ [class.copy]p5: 1297 // The implicitly-declared copy constructor for a class X will 1298 // have the form 1299 // 1300 // X::X(const X&) 1301 // 1302 // if 1303 bool HasConstCopyConstructor = true; 1304 1305 // -- each direct or virtual base class B of X has a copy 1306 // constructor whose first parameter is of type const B& or 1307 // const volatile B&, and 1308 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1309 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1310 const CXXRecordDecl *BaseClassDecl 1311 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1312 HasConstCopyConstructor 1313 = BaseClassDecl->hasConstCopyConstructor(Context); 1314 } 1315 1316 // -- for all the nonstatic data members of X that are of a 1317 // class type M (or array thereof), each such class type 1318 // has a copy constructor whose first parameter is of type 1319 // const M& or const volatile M&. 1320 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1321 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1322 ++Field) { 1323 QualType FieldType = (*Field)->getType(); 1324 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1325 FieldType = Array->getElementType(); 1326 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1327 const CXXRecordDecl *FieldClassDecl 1328 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1329 HasConstCopyConstructor 1330 = FieldClassDecl->hasConstCopyConstructor(Context); 1331 } 1332 } 1333 1334 // Otherwise, the implicitly declared copy constructor will have 1335 // the form 1336 // 1337 // X::X(X&) 1338 QualType ArgType = ClassType; 1339 if (HasConstCopyConstructor) 1340 ArgType = ArgType.withConst(); 1341 ArgType = Context.getLValueReferenceType(ArgType); 1342 1343 // An implicitly-declared copy constructor is an inline public 1344 // member of its class. 1345 DeclarationName Name 1346 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1347 CXXConstructorDecl *CopyConstructor 1348 = CXXConstructorDecl::Create(Context, ClassDecl, 1349 ClassDecl->getLocation(), Name, 1350 Context.getFunctionType(Context.VoidTy, 1351 &ArgType, 1, 1352 false, 0), 1353 /*isExplicit=*/false, 1354 /*isInline=*/true, 1355 /*isImplicitlyDeclared=*/true); 1356 CopyConstructor->setAccess(AS_public); 1357 CopyConstructor->setImplicit(); 1358 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1359 1360 // Add the parameter to the constructor. 1361 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1362 ClassDecl->getLocation(), 1363 /*IdentifierInfo=*/0, 1364 ArgType, VarDecl::None, 0); 1365 CopyConstructor->setParams(Context, &FromParam, 1); 1366 ClassDecl->addDecl(CopyConstructor); 1367 } 1368 1369 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1370 // Note: The following rules are largely analoguous to the copy 1371 // constructor rules. Note that virtual bases are not taken into account 1372 // for determining the argument type of the operator. Note also that 1373 // operators taking an object instead of a reference are allowed. 1374 // 1375 // C++ [class.copy]p10: 1376 // If the class definition does not explicitly declare a copy 1377 // assignment operator, one is declared implicitly. 1378 // The implicitly-defined copy assignment operator for a class X 1379 // will have the form 1380 // 1381 // X& X::operator=(const X&) 1382 // 1383 // if 1384 bool HasConstCopyAssignment = true; 1385 1386 // -- each direct base class B of X has a copy assignment operator 1387 // whose parameter is of type const B&, const volatile B& or B, 1388 // and 1389 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1390 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1391 const CXXRecordDecl *BaseClassDecl 1392 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1393 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1394 } 1395 1396 // -- for all the nonstatic data members of X that are of a class 1397 // type M (or array thereof), each such class type has a copy 1398 // assignment operator whose parameter is of type const M&, 1399 // const volatile M& or M. 1400 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1401 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1402 ++Field) { 1403 QualType FieldType = (*Field)->getType(); 1404 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1405 FieldType = Array->getElementType(); 1406 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1407 const CXXRecordDecl *FieldClassDecl 1408 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1409 HasConstCopyAssignment 1410 = FieldClassDecl->hasConstCopyAssignment(Context); 1411 } 1412 } 1413 1414 // Otherwise, the implicitly declared copy assignment operator will 1415 // have the form 1416 // 1417 // X& X::operator=(X&) 1418 QualType ArgType = ClassType; 1419 QualType RetType = Context.getLValueReferenceType(ArgType); 1420 if (HasConstCopyAssignment) 1421 ArgType = ArgType.withConst(); 1422 ArgType = Context.getLValueReferenceType(ArgType); 1423 1424 // An implicitly-declared copy assignment operator is an inline public 1425 // member of its class. 1426 DeclarationName Name = 1427 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1428 CXXMethodDecl *CopyAssignment = 1429 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1430 Context.getFunctionType(RetType, &ArgType, 1, 1431 false, 0), 1432 /*isStatic=*/false, /*isInline=*/true); 1433 CopyAssignment->setAccess(AS_public); 1434 CopyAssignment->setImplicit(); 1435 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1436 1437 // Add the parameter to the operator. 1438 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1439 ClassDecl->getLocation(), 1440 /*IdentifierInfo=*/0, 1441 ArgType, VarDecl::None, 0); 1442 CopyAssignment->setParams(Context, &FromParam, 1); 1443 1444 // Don't call addedAssignmentOperator. There is no way to distinguish an 1445 // implicit from an explicit assignment operator. 1446 ClassDecl->addDecl(CopyAssignment); 1447 } 1448 1449 if (!ClassDecl->hasUserDeclaredDestructor()) { 1450 // C++ [class.dtor]p2: 1451 // If a class has no user-declared destructor, a destructor is 1452 // declared implicitly. An implicitly-declared destructor is an 1453 // inline public member of its class. 1454 DeclarationName Name 1455 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1456 CXXDestructorDecl *Destructor 1457 = CXXDestructorDecl::Create(Context, ClassDecl, 1458 ClassDecl->getLocation(), Name, 1459 Context.getFunctionType(Context.VoidTy, 1460 0, 0, false, 0), 1461 /*isInline=*/true, 1462 /*isImplicitlyDeclared=*/true); 1463 Destructor->setAccess(AS_public); 1464 Destructor->setImplicit(); 1465 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1466 ClassDecl->addDecl(Destructor); 1467 } 1468} 1469 1470void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1471 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1472 if (!Template) 1473 return; 1474 1475 TemplateParameterList *Params = Template->getTemplateParameters(); 1476 for (TemplateParameterList::iterator Param = Params->begin(), 1477 ParamEnd = Params->end(); 1478 Param != ParamEnd; ++Param) { 1479 NamedDecl *Named = cast<NamedDecl>(*Param); 1480 if (Named->getDeclName()) { 1481 S->AddDecl(DeclPtrTy::make(Named)); 1482 IdResolver.AddDecl(Named); 1483 } 1484 } 1485} 1486 1487/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1488/// parsing a top-level (non-nested) C++ class, and we are now 1489/// parsing those parts of the given Method declaration that could 1490/// not be parsed earlier (C++ [class.mem]p2), such as default 1491/// arguments. This action should enter the scope of the given 1492/// Method declaration as if we had just parsed the qualified method 1493/// name. However, it should not bring the parameters into scope; 1494/// that will be performed by ActOnDelayedCXXMethodParameter. 1495void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1496 if (!MethodD) 1497 return; 1498 1499 CXXScopeSpec SS; 1500 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1501 QualType ClassTy 1502 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1503 SS.setScopeRep( 1504 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1505 ActOnCXXEnterDeclaratorScope(S, SS); 1506} 1507 1508/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1509/// C++ method declaration. We're (re-)introducing the given 1510/// function parameter into scope for use in parsing later parts of 1511/// the method declaration. For example, we could see an 1512/// ActOnParamDefaultArgument event for this parameter. 1513void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1514 if (!ParamD) 1515 return; 1516 1517 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1518 1519 // If this parameter has an unparsed default argument, clear it out 1520 // to make way for the parsed default argument. 1521 if (Param->hasUnparsedDefaultArg()) 1522 Param->setDefaultArg(0); 1523 1524 S->AddDecl(DeclPtrTy::make(Param)); 1525 if (Param->getDeclName()) 1526 IdResolver.AddDecl(Param); 1527} 1528 1529/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1530/// processing the delayed method declaration for Method. The method 1531/// declaration is now considered finished. There may be a separate 1532/// ActOnStartOfFunctionDef action later (not necessarily 1533/// immediately!) for this method, if it was also defined inside the 1534/// class body. 1535void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1536 if (!MethodD) 1537 return; 1538 1539 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1540 CXXScopeSpec SS; 1541 QualType ClassTy 1542 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1543 SS.setScopeRep( 1544 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1545 ActOnCXXExitDeclaratorScope(S, SS); 1546 1547 // Now that we have our default arguments, check the constructor 1548 // again. It could produce additional diagnostics or affect whether 1549 // the class has implicitly-declared destructors, among other 1550 // things. 1551 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1552 CheckConstructor(Constructor); 1553 1554 // Check the default arguments, which we may have added. 1555 if (!Method->isInvalidDecl()) 1556 CheckCXXDefaultArguments(Method); 1557} 1558 1559/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1560/// the well-formedness of the constructor declarator @p D with type @p 1561/// R. If there are any errors in the declarator, this routine will 1562/// emit diagnostics and set the invalid bit to true. In any case, the type 1563/// will be updated to reflect a well-formed type for the constructor and 1564/// returned. 1565QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1566 FunctionDecl::StorageClass &SC) { 1567 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1568 1569 // C++ [class.ctor]p3: 1570 // A constructor shall not be virtual (10.3) or static (9.4). A 1571 // constructor can be invoked for a const, volatile or const 1572 // volatile object. A constructor shall not be declared const, 1573 // volatile, or const volatile (9.3.2). 1574 if (isVirtual) { 1575 if (!D.isInvalidType()) 1576 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1577 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1578 << SourceRange(D.getIdentifierLoc()); 1579 D.setInvalidType(); 1580 } 1581 if (SC == FunctionDecl::Static) { 1582 if (!D.isInvalidType()) 1583 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1584 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1585 << SourceRange(D.getIdentifierLoc()); 1586 D.setInvalidType(); 1587 SC = FunctionDecl::None; 1588 } 1589 1590 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1591 if (FTI.TypeQuals != 0) { 1592 if (FTI.TypeQuals & QualType::Const) 1593 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1594 << "const" << SourceRange(D.getIdentifierLoc()); 1595 if (FTI.TypeQuals & QualType::Volatile) 1596 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1597 << "volatile" << SourceRange(D.getIdentifierLoc()); 1598 if (FTI.TypeQuals & QualType::Restrict) 1599 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1600 << "restrict" << SourceRange(D.getIdentifierLoc()); 1601 } 1602 1603 // Rebuild the function type "R" without any type qualifiers (in 1604 // case any of the errors above fired) and with "void" as the 1605 // return type, since constructors don't have return types. We 1606 // *always* have to do this, because GetTypeForDeclarator will 1607 // put in a result type of "int" when none was specified. 1608 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1609 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1610 Proto->getNumArgs(), 1611 Proto->isVariadic(), 0); 1612} 1613 1614/// CheckConstructor - Checks a fully-formed constructor for 1615/// well-formedness, issuing any diagnostics required. Returns true if 1616/// the constructor declarator is invalid. 1617void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1618 CXXRecordDecl *ClassDecl 1619 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1620 if (!ClassDecl) 1621 return Constructor->setInvalidDecl(); 1622 1623 // C++ [class.copy]p3: 1624 // A declaration of a constructor for a class X is ill-formed if 1625 // its first parameter is of type (optionally cv-qualified) X and 1626 // either there are no other parameters or else all other 1627 // parameters have default arguments. 1628 if (!Constructor->isInvalidDecl() && 1629 ((Constructor->getNumParams() == 1) || 1630 (Constructor->getNumParams() > 1 && 1631 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1632 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1633 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1634 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1635 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1636 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1637 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1638 Constructor->setInvalidDecl(); 1639 } 1640 } 1641 1642 // Notify the class that we've added a constructor. 1643 ClassDecl->addedConstructor(Context, Constructor); 1644} 1645 1646static inline bool 1647FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1648 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1649 FTI.ArgInfo[0].Param && 1650 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1651} 1652 1653/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1654/// the well-formednes of the destructor declarator @p D with type @p 1655/// R. If there are any errors in the declarator, this routine will 1656/// emit diagnostics and set the declarator to invalid. Even if this happens, 1657/// will be updated to reflect a well-formed type for the destructor and 1658/// returned. 1659QualType Sema::CheckDestructorDeclarator(Declarator &D, 1660 FunctionDecl::StorageClass& SC) { 1661 // C++ [class.dtor]p1: 1662 // [...] A typedef-name that names a class is a class-name 1663 // (7.1.3); however, a typedef-name that names a class shall not 1664 // be used as the identifier in the declarator for a destructor 1665 // declaration. 1666 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1667 if (isa<TypedefType>(DeclaratorType)) { 1668 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1669 << DeclaratorType; 1670 D.setInvalidType(); 1671 } 1672 1673 // C++ [class.dtor]p2: 1674 // A destructor is used to destroy objects of its class type. A 1675 // destructor takes no parameters, and no return type can be 1676 // specified for it (not even void). The address of a destructor 1677 // shall not be taken. A destructor shall not be static. A 1678 // destructor can be invoked for a const, volatile or const 1679 // volatile object. A destructor shall not be declared const, 1680 // volatile or const volatile (9.3.2). 1681 if (SC == FunctionDecl::Static) { 1682 if (!D.isInvalidType()) 1683 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1684 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1685 << SourceRange(D.getIdentifierLoc()); 1686 SC = FunctionDecl::None; 1687 D.setInvalidType(); 1688 } 1689 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1690 // Destructors don't have return types, but the parser will 1691 // happily parse something like: 1692 // 1693 // class X { 1694 // float ~X(); 1695 // }; 1696 // 1697 // The return type will be eliminated later. 1698 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1699 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1700 << SourceRange(D.getIdentifierLoc()); 1701 } 1702 1703 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1704 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1705 if (FTI.TypeQuals & QualType::Const) 1706 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1707 << "const" << SourceRange(D.getIdentifierLoc()); 1708 if (FTI.TypeQuals & QualType::Volatile) 1709 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1710 << "volatile" << SourceRange(D.getIdentifierLoc()); 1711 if (FTI.TypeQuals & QualType::Restrict) 1712 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1713 << "restrict" << SourceRange(D.getIdentifierLoc()); 1714 D.setInvalidType(); 1715 } 1716 1717 // Make sure we don't have any parameters. 1718 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1719 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1720 1721 // Delete the parameters. 1722 FTI.freeArgs(); 1723 D.setInvalidType(); 1724 } 1725 1726 // Make sure the destructor isn't variadic. 1727 if (FTI.isVariadic) { 1728 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1729 D.setInvalidType(); 1730 } 1731 1732 // Rebuild the function type "R" without any type qualifiers or 1733 // parameters (in case any of the errors above fired) and with 1734 // "void" as the return type, since destructors don't have return 1735 // types. We *always* have to do this, because GetTypeForDeclarator 1736 // will put in a result type of "int" when none was specified. 1737 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1738} 1739 1740/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1741/// well-formednes of the conversion function declarator @p D with 1742/// type @p R. If there are any errors in the declarator, this routine 1743/// will emit diagnostics and return true. Otherwise, it will return 1744/// false. Either way, the type @p R will be updated to reflect a 1745/// well-formed type for the conversion operator. 1746void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1747 FunctionDecl::StorageClass& SC) { 1748 // C++ [class.conv.fct]p1: 1749 // Neither parameter types nor return type can be specified. The 1750 // type of a conversion function (8.3.5) is “function taking no 1751 // parameter returning conversion-type-id.” 1752 if (SC == FunctionDecl::Static) { 1753 if (!D.isInvalidType()) 1754 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1755 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1756 << SourceRange(D.getIdentifierLoc()); 1757 D.setInvalidType(); 1758 SC = FunctionDecl::None; 1759 } 1760 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1761 // Conversion functions don't have return types, but the parser will 1762 // happily parse something like: 1763 // 1764 // class X { 1765 // float operator bool(); 1766 // }; 1767 // 1768 // The return type will be changed later anyway. 1769 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1770 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1771 << SourceRange(D.getIdentifierLoc()); 1772 } 1773 1774 // Make sure we don't have any parameters. 1775 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1776 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1777 1778 // Delete the parameters. 1779 D.getTypeObject(0).Fun.freeArgs(); 1780 D.setInvalidType(); 1781 } 1782 1783 // Make sure the conversion function isn't variadic. 1784 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1785 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1786 D.setInvalidType(); 1787 } 1788 1789 // C++ [class.conv.fct]p4: 1790 // The conversion-type-id shall not represent a function type nor 1791 // an array type. 1792 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1793 if (ConvType->isArrayType()) { 1794 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1795 ConvType = Context.getPointerType(ConvType); 1796 D.setInvalidType(); 1797 } else if (ConvType->isFunctionType()) { 1798 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1799 ConvType = Context.getPointerType(ConvType); 1800 D.setInvalidType(); 1801 } 1802 1803 // Rebuild the function type "R" without any parameters (in case any 1804 // of the errors above fired) and with the conversion type as the 1805 // return type. 1806 R = Context.getFunctionType(ConvType, 0, 0, false, 1807 R->getAsFunctionProtoType()->getTypeQuals()); 1808 1809 // C++0x explicit conversion operators. 1810 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1811 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1812 diag::warn_explicit_conversion_functions) 1813 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1814} 1815 1816/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1817/// the declaration of the given C++ conversion function. This routine 1818/// is responsible for recording the conversion function in the C++ 1819/// class, if possible. 1820Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1821 assert(Conversion && "Expected to receive a conversion function declaration"); 1822 1823 // Set the lexical context of this conversion function 1824 Conversion->setLexicalDeclContext(CurContext); 1825 1826 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1827 1828 // Make sure we aren't redeclaring the conversion function. 1829 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1830 1831 // C++ [class.conv.fct]p1: 1832 // [...] A conversion function is never used to convert a 1833 // (possibly cv-qualified) object to the (possibly cv-qualified) 1834 // same object type (or a reference to it), to a (possibly 1835 // cv-qualified) base class of that type (or a reference to it), 1836 // or to (possibly cv-qualified) void. 1837 // FIXME: Suppress this warning if the conversion function ends up being a 1838 // virtual function that overrides a virtual function in a base class. 1839 QualType ClassType 1840 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1841 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1842 ConvType = ConvTypeRef->getPointeeType(); 1843 if (ConvType->isRecordType()) { 1844 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1845 if (ConvType == ClassType) 1846 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1847 << ClassType; 1848 else if (IsDerivedFrom(ClassType, ConvType)) 1849 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1850 << ClassType << ConvType; 1851 } else if (ConvType->isVoidType()) { 1852 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1853 << ClassType << ConvType; 1854 } 1855 1856 if (Conversion->getPreviousDeclaration()) { 1857 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1858 for (OverloadedFunctionDecl::function_iterator 1859 Conv = Conversions->function_begin(), 1860 ConvEnd = Conversions->function_end(); 1861 Conv != ConvEnd; ++Conv) { 1862 if (*Conv 1863 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1864 *Conv = Conversion; 1865 return DeclPtrTy::make(Conversion); 1866 } 1867 } 1868 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1869 } else 1870 ClassDecl->addConversionFunction(Context, Conversion); 1871 1872 return DeclPtrTy::make(Conversion); 1873} 1874 1875//===----------------------------------------------------------------------===// 1876// Namespace Handling 1877//===----------------------------------------------------------------------===// 1878 1879/// ActOnStartNamespaceDef - This is called at the start of a namespace 1880/// definition. 1881Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1882 SourceLocation IdentLoc, 1883 IdentifierInfo *II, 1884 SourceLocation LBrace) { 1885 NamespaceDecl *Namespc = 1886 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1887 Namespc->setLBracLoc(LBrace); 1888 1889 Scope *DeclRegionScope = NamespcScope->getParent(); 1890 1891 if (II) { 1892 // C++ [namespace.def]p2: 1893 // The identifier in an original-namespace-definition shall not have been 1894 // previously defined in the declarative region in which the 1895 // original-namespace-definition appears. The identifier in an 1896 // original-namespace-definition is the name of the namespace. Subsequently 1897 // in that declarative region, it is treated as an original-namespace-name. 1898 1899 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1900 true); 1901 1902 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1903 // This is an extended namespace definition. 1904 // Attach this namespace decl to the chain of extended namespace 1905 // definitions. 1906 OrigNS->setNextNamespace(Namespc); 1907 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1908 1909 // Remove the previous declaration from the scope. 1910 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1911 IdResolver.RemoveDecl(OrigNS); 1912 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1913 } 1914 } else if (PrevDecl) { 1915 // This is an invalid name redefinition. 1916 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1917 << Namespc->getDeclName(); 1918 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1919 Namespc->setInvalidDecl(); 1920 // Continue on to push Namespc as current DeclContext and return it. 1921 } 1922 1923 PushOnScopeChains(Namespc, DeclRegionScope); 1924 } else { 1925 // FIXME: Handle anonymous namespaces 1926 } 1927 1928 // Although we could have an invalid decl (i.e. the namespace name is a 1929 // redefinition), push it as current DeclContext and try to continue parsing. 1930 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1931 // for the namespace has the declarations that showed up in that particular 1932 // namespace definition. 1933 PushDeclContext(NamespcScope, Namespc); 1934 return DeclPtrTy::make(Namespc); 1935} 1936 1937/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1938/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1939void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1940 Decl *Dcl = D.getAs<Decl>(); 1941 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1942 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1943 Namespc->setRBracLoc(RBrace); 1944 PopDeclContext(); 1945} 1946 1947Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1948 SourceLocation UsingLoc, 1949 SourceLocation NamespcLoc, 1950 const CXXScopeSpec &SS, 1951 SourceLocation IdentLoc, 1952 IdentifierInfo *NamespcName, 1953 AttributeList *AttrList) { 1954 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1955 assert(NamespcName && "Invalid NamespcName."); 1956 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1957 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1958 1959 UsingDirectiveDecl *UDir = 0; 1960 1961 // Lookup namespace name. 1962 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1963 LookupNamespaceName, false); 1964 if (R.isAmbiguous()) { 1965 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1966 return DeclPtrTy(); 1967 } 1968 if (NamedDecl *NS = R) { 1969 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1970 // C++ [namespace.udir]p1: 1971 // A using-directive specifies that the names in the nominated 1972 // namespace can be used in the scope in which the 1973 // using-directive appears after the using-directive. During 1974 // unqualified name lookup (3.4.1), the names appear as if they 1975 // were declared in the nearest enclosing namespace which 1976 // contains both the using-directive and the nominated 1977 // namespace. [Note: in this context, “contains” means “contains 1978 // directly or indirectly”. ] 1979 1980 // Find enclosing context containing both using-directive and 1981 // nominated namespace. 1982 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1983 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1984 CommonAncestor = CommonAncestor->getParent(); 1985 1986 UDir = UsingDirectiveDecl::Create(Context, 1987 CurContext, UsingLoc, 1988 NamespcLoc, 1989 SS.getRange(), 1990 (NestedNameSpecifier *)SS.getScopeRep(), 1991 IdentLoc, 1992 cast<NamespaceDecl>(NS), 1993 CommonAncestor); 1994 PushUsingDirective(S, UDir); 1995 } else { 1996 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1997 } 1998 1999 // FIXME: We ignore attributes for now. 2000 delete AttrList; 2001 return DeclPtrTy::make(UDir); 2002} 2003 2004void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2005 // If scope has associated entity, then using directive is at namespace 2006 // or translation unit scope. We add UsingDirectiveDecls, into 2007 // it's lookup structure. 2008 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2009 Ctx->addDecl(UDir); 2010 else 2011 // Otherwise it is block-sope. using-directives will affect lookup 2012 // only to the end of scope. 2013 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2014} 2015 2016 2017Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2018 SourceLocation UsingLoc, 2019 const CXXScopeSpec &SS, 2020 SourceLocation IdentLoc, 2021 IdentifierInfo *TargetName, 2022 OverloadedOperatorKind Op, 2023 AttributeList *AttrList, 2024 bool IsTypeName) { 2025 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2026 assert((TargetName || Op) && "Invalid TargetName."); 2027 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2028 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2029 2030 UsingDecl *UsingAlias = 0; 2031 2032 DeclarationName Name; 2033 if (TargetName) 2034 Name = TargetName; 2035 else 2036 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2037 2038 // Lookup target name. 2039 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2040 2041 if (NamedDecl *NS = R) { 2042 if (IsTypeName && !isa<TypeDecl>(NS)) { 2043 Diag(IdentLoc, diag::err_using_typename_non_type); 2044 } 2045 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2046 NS->getLocation(), UsingLoc, NS, 2047 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2048 IsTypeName); 2049 PushOnScopeChains(UsingAlias, S); 2050 } else { 2051 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2052 } 2053 2054 // FIXME: We ignore attributes for now. 2055 delete AttrList; 2056 return DeclPtrTy::make(UsingAlias); 2057} 2058 2059/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2060/// is a namespace alias, returns the namespace it points to. 2061static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2062 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2063 return AD->getNamespace(); 2064 return dyn_cast_or_null<NamespaceDecl>(D); 2065} 2066 2067Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2068 SourceLocation NamespaceLoc, 2069 SourceLocation AliasLoc, 2070 IdentifierInfo *Alias, 2071 const CXXScopeSpec &SS, 2072 SourceLocation IdentLoc, 2073 IdentifierInfo *Ident) { 2074 2075 // Lookup the namespace name. 2076 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2077 2078 // Check if we have a previous declaration with the same name. 2079 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2080 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2081 // We already have an alias with the same name that points to the same 2082 // namespace, so don't create a new one. 2083 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2084 return DeclPtrTy(); 2085 } 2086 2087 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2088 diag::err_redefinition_different_kind; 2089 Diag(AliasLoc, DiagID) << Alias; 2090 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2091 return DeclPtrTy(); 2092 } 2093 2094 if (R.isAmbiguous()) { 2095 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2096 return DeclPtrTy(); 2097 } 2098 2099 if (!R) { 2100 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2101 return DeclPtrTy(); 2102 } 2103 2104 NamespaceAliasDecl *AliasDecl = 2105 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2106 Alias, SS.getRange(), 2107 (NestedNameSpecifier *)SS.getScopeRep(), 2108 IdentLoc, R); 2109 2110 CurContext->addDecl(AliasDecl); 2111 return DeclPtrTy::make(AliasDecl); 2112} 2113 2114void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2115 CXXConstructorDecl *Constructor) { 2116 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2117 !Constructor->isUsed()) && 2118 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2119 2120 CXXRecordDecl *ClassDecl 2121 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2122 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2123 // Before the implicitly-declared default constructor for a class is 2124 // implicitly defined, all the implicitly-declared default constructors 2125 // for its base class and its non-static data members shall have been 2126 // implicitly defined. 2127 bool err = false; 2128 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2129 E = ClassDecl->bases_end(); Base != E; ++Base) { 2130 CXXRecordDecl *BaseClassDecl 2131 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2132 if (!BaseClassDecl->hasTrivialConstructor()) { 2133 if (CXXConstructorDecl *BaseCtor = 2134 BaseClassDecl->getDefaultConstructor(Context)) 2135 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2136 else { 2137 Diag(CurrentLocation, diag::err_defining_default_ctor) 2138 << Context.getTagDeclType(ClassDecl) << 1 2139 << Context.getTagDeclType(BaseClassDecl); 2140 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2141 << Context.getTagDeclType(BaseClassDecl); 2142 err = true; 2143 } 2144 } 2145 } 2146 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2147 E = ClassDecl->field_end(); Field != E; ++Field) { 2148 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2149 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2150 FieldType = Array->getElementType(); 2151 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2152 CXXRecordDecl *FieldClassDecl 2153 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2154 if (!FieldClassDecl->hasTrivialConstructor()) { 2155 if (CXXConstructorDecl *FieldCtor = 2156 FieldClassDecl->getDefaultConstructor(Context)) 2157 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2158 else { 2159 Diag(CurrentLocation, diag::err_defining_default_ctor) 2160 << Context.getTagDeclType(ClassDecl) << 0 << 2161 Context.getTagDeclType(FieldClassDecl); 2162 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2163 << Context.getTagDeclType(FieldClassDecl); 2164 err = true; 2165 } 2166 } 2167 } else if (FieldType->isReferenceType()) { 2168 Diag(CurrentLocation, diag::err_unintialized_member) 2169 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2170 Diag((*Field)->getLocation(), diag::note_declared_at); 2171 err = true; 2172 } else if (FieldType.isConstQualified()) { 2173 Diag(CurrentLocation, diag::err_unintialized_member) 2174 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2175 Diag((*Field)->getLocation(), diag::note_declared_at); 2176 err = true; 2177 } 2178 } 2179 if (!err) 2180 Constructor->setUsed(); 2181 else 2182 Constructor->setInvalidDecl(); 2183} 2184 2185void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2186 CXXDestructorDecl *Destructor) { 2187 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2188 "DefineImplicitDestructor - call it for implicit default dtor"); 2189 2190 CXXRecordDecl *ClassDecl 2191 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2192 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2193 // C++ [class.dtor] p5 2194 // Before the implicitly-declared default destructor for a class is 2195 // implicitly defined, all the implicitly-declared default destructors 2196 // for its base class and its non-static data members shall have been 2197 // implicitly defined. 2198 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2199 E = ClassDecl->bases_end(); Base != E; ++Base) { 2200 CXXRecordDecl *BaseClassDecl 2201 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2202 if (!BaseClassDecl->hasTrivialDestructor()) { 2203 if (CXXDestructorDecl *BaseDtor = 2204 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2205 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2206 else 2207 assert(false && 2208 "DefineImplicitDestructor - missing dtor in a base class"); 2209 } 2210 } 2211 2212 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2213 E = ClassDecl->field_end(); Field != E; ++Field) { 2214 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2215 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2216 FieldType = Array->getElementType(); 2217 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2218 CXXRecordDecl *FieldClassDecl 2219 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2220 if (!FieldClassDecl->hasTrivialDestructor()) { 2221 if (CXXDestructorDecl *FieldDtor = 2222 const_cast<CXXDestructorDecl*>( 2223 FieldClassDecl->getDestructor(Context))) 2224 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2225 else 2226 assert(false && 2227 "DefineImplicitDestructor - missing dtor in class of a data member"); 2228 } 2229 } 2230 } 2231 Destructor->setUsed(); 2232} 2233 2234void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2235 CXXMethodDecl *MethodDecl) { 2236 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2237 MethodDecl->getOverloadedOperator() == OO_Equal && 2238 !MethodDecl->isUsed()) && 2239 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2240 2241 CXXRecordDecl *ClassDecl 2242 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2243 2244 // C++[class.copy] p12 2245 // Before the implicitly-declared copy assignment operator for a class is 2246 // implicitly defined, all implicitly-declared copy assignment operators 2247 // for its direct base classes and its nonstatic data members shall have 2248 // been implicitly defined. 2249 bool err = false; 2250 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2251 E = ClassDecl->bases_end(); Base != E; ++Base) { 2252 CXXRecordDecl *BaseClassDecl 2253 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2254 if (CXXMethodDecl *BaseAssignOpMethod = 2255 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2256 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2257 } 2258 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2259 E = ClassDecl->field_end(); Field != E; ++Field) { 2260 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2261 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2262 FieldType = Array->getElementType(); 2263 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2264 CXXRecordDecl *FieldClassDecl 2265 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2266 if (CXXMethodDecl *FieldAssignOpMethod = 2267 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2268 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2269 } else if (FieldType->isReferenceType()) { 2270 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2271 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2272 Diag(Field->getLocation(), diag::note_declared_at); 2273 Diag(CurrentLocation, diag::note_first_required_here); 2274 err = true; 2275 } else if (FieldType.isConstQualified()) { 2276 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2277 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2278 Diag(Field->getLocation(), diag::note_declared_at); 2279 Diag(CurrentLocation, diag::note_first_required_here); 2280 err = true; 2281 } 2282 } 2283 if (!err) 2284 MethodDecl->setUsed(); 2285} 2286 2287CXXMethodDecl * 2288Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2289 CXXRecordDecl *ClassDecl) { 2290 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2291 QualType RHSType(LHSType); 2292 // If class's assignment operator argument is const/volatile qualified, 2293 // look for operator = (const/volatile B&). Otherwise, look for 2294 // operator = (B&). 2295 if (ParmDecl->getType().isConstQualified()) 2296 RHSType.addConst(); 2297 if (ParmDecl->getType().isVolatileQualified()) 2298 RHSType.addVolatile(); 2299 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2300 LHSType, 2301 SourceLocation())); 2302 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2303 RHSType, 2304 SourceLocation())); 2305 Expr *Args[2] = { &*LHS, &*RHS }; 2306 OverloadCandidateSet CandidateSet; 2307 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2308 CandidateSet); 2309 OverloadCandidateSet::iterator Best; 2310 if (BestViableFunction(CandidateSet, 2311 ClassDecl->getLocation(), Best) == OR_Success) 2312 return cast<CXXMethodDecl>(Best->Function); 2313 assert(false && 2314 "getAssignOperatorMethod - copy assignment operator method not found"); 2315 return 0; 2316} 2317 2318void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2319 CXXConstructorDecl *CopyConstructor, 2320 unsigned TypeQuals) { 2321 assert((CopyConstructor->isImplicit() && 2322 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2323 !CopyConstructor->isUsed()) && 2324 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2325 2326 CXXRecordDecl *ClassDecl 2327 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2328 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2329 // C++ [class.copy] p209 2330 // Before the implicitly-declared copy constructor for a class is 2331 // implicitly defined, all the implicitly-declared copy constructors 2332 // for its base class and its non-static data members shall have been 2333 // implicitly defined. 2334 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2335 Base != ClassDecl->bases_end(); ++Base) { 2336 CXXRecordDecl *BaseClassDecl 2337 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2338 if (CXXConstructorDecl *BaseCopyCtor = 2339 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2340 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2341 } 2342 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2343 FieldEnd = ClassDecl->field_end(); 2344 Field != FieldEnd; ++Field) { 2345 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2346 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2347 FieldType = Array->getElementType(); 2348 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2349 CXXRecordDecl *FieldClassDecl 2350 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2351 if (CXXConstructorDecl *FieldCopyCtor = 2352 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2353 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2354 } 2355 } 2356 CopyConstructor->setUsed(); 2357} 2358 2359void Sema::InitializeVarWithConstructor(VarDecl *VD, 2360 CXXConstructorDecl *Constructor, 2361 QualType DeclInitType, 2362 Expr **Exprs, unsigned NumExprs) { 2363 CXXConstructExpr *Temp = CXXConstructExpr::Create(Context, DeclInitType, 2364 Constructor, 2365 false, Exprs, NumExprs); 2366 // default arguments must be added to constructor call expression. 2367 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2368 unsigned NumArgsInProto = FDecl->param_size(); 2369 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2370 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2371 2372 // If the default expression creates temporaries, we need to 2373 // push them to the current stack of expression temporaries so they'll 2374 // be properly destroyed. 2375 if (CXXExprWithTemporaries *E 2376 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2377 assert(!E->shouldDestroyTemporaries() && 2378 "Can't destroy temporaries in a default argument expr!"); 2379 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2380 ExprTemporaries.push_back(E->getTemporary(I)); 2381 } 2382 Expr *Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(j)); 2383 Temp->setArg(j, Arg); 2384 } 2385 2386 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2387 VD->setInit(Context, Temp); 2388} 2389 2390void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2391{ 2392 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2393 DeclInitType->getAs<RecordType>()->getDecl()); 2394 if (!ClassDecl->hasTrivialDestructor()) 2395 if (CXXDestructorDecl *Destructor = 2396 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2397 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2398} 2399 2400/// AddCXXDirectInitializerToDecl - This action is called immediately after 2401/// ActOnDeclarator, when a C++ direct initializer is present. 2402/// e.g: "int x(1);" 2403void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2404 SourceLocation LParenLoc, 2405 MultiExprArg Exprs, 2406 SourceLocation *CommaLocs, 2407 SourceLocation RParenLoc) { 2408 unsigned NumExprs = Exprs.size(); 2409 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2410 Decl *RealDecl = Dcl.getAs<Decl>(); 2411 2412 // If there is no declaration, there was an error parsing it. Just ignore 2413 // the initializer. 2414 if (RealDecl == 0) 2415 return; 2416 2417 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2418 if (!VDecl) { 2419 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2420 RealDecl->setInvalidDecl(); 2421 return; 2422 } 2423 2424 // FIXME: Need to handle dependent types and expressions here. 2425 2426 // We will treat direct-initialization as a copy-initialization: 2427 // int x(1); -as-> int x = 1; 2428 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2429 // 2430 // Clients that want to distinguish between the two forms, can check for 2431 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2432 // A major benefit is that clients that don't particularly care about which 2433 // exactly form was it (like the CodeGen) can handle both cases without 2434 // special case code. 2435 2436 // C++ 8.5p11: 2437 // The form of initialization (using parentheses or '=') is generally 2438 // insignificant, but does matter when the entity being initialized has a 2439 // class type. 2440 QualType DeclInitType = VDecl->getType(); 2441 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2442 DeclInitType = Array->getElementType(); 2443 2444 // FIXME: This isn't the right place to complete the type. 2445 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2446 diag::err_typecheck_decl_incomplete_type)) { 2447 VDecl->setInvalidDecl(); 2448 return; 2449 } 2450 2451 if (VDecl->getType()->isRecordType()) { 2452 CXXConstructorDecl *Constructor 2453 = PerformInitializationByConstructor(DeclInitType, 2454 (Expr **)Exprs.get(), NumExprs, 2455 VDecl->getLocation(), 2456 SourceRange(VDecl->getLocation(), 2457 RParenLoc), 2458 VDecl->getDeclName(), 2459 IK_Direct); 2460 if (!Constructor) 2461 RealDecl->setInvalidDecl(); 2462 else { 2463 VDecl->setCXXDirectInitializer(true); 2464 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2465 (Expr**)Exprs.release(), NumExprs); 2466 FinalizeVarWithDestructor(VDecl, DeclInitType); 2467 } 2468 return; 2469 } 2470 2471 if (NumExprs > 1) { 2472 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2473 << SourceRange(VDecl->getLocation(), RParenLoc); 2474 RealDecl->setInvalidDecl(); 2475 return; 2476 } 2477 2478 // Let clients know that initialization was done with a direct initializer. 2479 VDecl->setCXXDirectInitializer(true); 2480 2481 assert(NumExprs == 1 && "Expected 1 expression"); 2482 // Set the init expression, handles conversions. 2483 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2484 /*DirectInit=*/true); 2485} 2486 2487/// PerformInitializationByConstructor - Perform initialization by 2488/// constructor (C++ [dcl.init]p14), which may occur as part of 2489/// direct-initialization or copy-initialization. We are initializing 2490/// an object of type @p ClassType with the given arguments @p 2491/// Args. @p Loc is the location in the source code where the 2492/// initializer occurs (e.g., a declaration, member initializer, 2493/// functional cast, etc.) while @p Range covers the whole 2494/// initialization. @p InitEntity is the entity being initialized, 2495/// which may by the name of a declaration or a type. @p Kind is the 2496/// kind of initialization we're performing, which affects whether 2497/// explicit constructors will be considered. When successful, returns 2498/// the constructor that will be used to perform the initialization; 2499/// when the initialization fails, emits a diagnostic and returns 2500/// null. 2501CXXConstructorDecl * 2502Sema::PerformInitializationByConstructor(QualType ClassType, 2503 Expr **Args, unsigned NumArgs, 2504 SourceLocation Loc, SourceRange Range, 2505 DeclarationName InitEntity, 2506 InitializationKind Kind) { 2507 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2508 assert(ClassRec && "Can only initialize a class type here"); 2509 2510 // C++ [dcl.init]p14: 2511 // 2512 // If the initialization is direct-initialization, or if it is 2513 // copy-initialization where the cv-unqualified version of the 2514 // source type is the same class as, or a derived class of, the 2515 // class of the destination, constructors are considered. The 2516 // applicable constructors are enumerated (13.3.1.3), and the 2517 // best one is chosen through overload resolution (13.3). The 2518 // constructor so selected is called to initialize the object, 2519 // with the initializer expression(s) as its argument(s). If no 2520 // constructor applies, or the overload resolution is ambiguous, 2521 // the initialization is ill-formed. 2522 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2523 OverloadCandidateSet CandidateSet; 2524 2525 // Add constructors to the overload set. 2526 DeclarationName ConstructorName 2527 = Context.DeclarationNames.getCXXConstructorName( 2528 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2529 DeclContext::lookup_const_iterator Con, ConEnd; 2530 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2531 Con != ConEnd; ++Con) { 2532 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2533 if ((Kind == IK_Direct) || 2534 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2535 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2536 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2537 } 2538 2539 // FIXME: When we decide not to synthesize the implicitly-declared 2540 // constructors, we'll need to make them appear here. 2541 2542 OverloadCandidateSet::iterator Best; 2543 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2544 case OR_Success: 2545 // We found a constructor. Return it. 2546 return cast<CXXConstructorDecl>(Best->Function); 2547 2548 case OR_No_Viable_Function: 2549 if (InitEntity) 2550 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2551 << InitEntity << Range; 2552 else 2553 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2554 << ClassType << Range; 2555 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2556 return 0; 2557 2558 case OR_Ambiguous: 2559 if (InitEntity) 2560 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2561 else 2562 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2563 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2564 return 0; 2565 2566 case OR_Deleted: 2567 if (InitEntity) 2568 Diag(Loc, diag::err_ovl_deleted_init) 2569 << Best->Function->isDeleted() 2570 << InitEntity << Range; 2571 else 2572 Diag(Loc, diag::err_ovl_deleted_init) 2573 << Best->Function->isDeleted() 2574 << InitEntity << Range; 2575 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2576 return 0; 2577 } 2578 2579 return 0; 2580} 2581 2582/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2583/// determine whether they are reference-related, 2584/// reference-compatible, reference-compatible with added 2585/// qualification, or incompatible, for use in C++ initialization by 2586/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2587/// type, and the first type (T1) is the pointee type of the reference 2588/// type being initialized. 2589Sema::ReferenceCompareResult 2590Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2591 bool& DerivedToBase) { 2592 assert(!T1->isReferenceType() && 2593 "T1 must be the pointee type of the reference type"); 2594 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2595 2596 T1 = Context.getCanonicalType(T1); 2597 T2 = Context.getCanonicalType(T2); 2598 QualType UnqualT1 = T1.getUnqualifiedType(); 2599 QualType UnqualT2 = T2.getUnqualifiedType(); 2600 2601 // C++ [dcl.init.ref]p4: 2602 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2603 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2604 // T1 is a base class of T2. 2605 if (UnqualT1 == UnqualT2) 2606 DerivedToBase = false; 2607 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2608 DerivedToBase = true; 2609 else 2610 return Ref_Incompatible; 2611 2612 // At this point, we know that T1 and T2 are reference-related (at 2613 // least). 2614 2615 // C++ [dcl.init.ref]p4: 2616 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2617 // reference-related to T2 and cv1 is the same cv-qualification 2618 // as, or greater cv-qualification than, cv2. For purposes of 2619 // overload resolution, cases for which cv1 is greater 2620 // cv-qualification than cv2 are identified as 2621 // reference-compatible with added qualification (see 13.3.3.2). 2622 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2623 return Ref_Compatible; 2624 else if (T1.isMoreQualifiedThan(T2)) 2625 return Ref_Compatible_With_Added_Qualification; 2626 else 2627 return Ref_Related; 2628} 2629 2630/// CheckReferenceInit - Check the initialization of a reference 2631/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2632/// the initializer (either a simple initializer or an initializer 2633/// list), and DeclType is the type of the declaration. When ICS is 2634/// non-null, this routine will compute the implicit conversion 2635/// sequence according to C++ [over.ics.ref] and will not produce any 2636/// diagnostics; when ICS is null, it will emit diagnostics when any 2637/// errors are found. Either way, a return value of true indicates 2638/// that there was a failure, a return value of false indicates that 2639/// the reference initialization succeeded. 2640/// 2641/// When @p SuppressUserConversions, user-defined conversions are 2642/// suppressed. 2643/// When @p AllowExplicit, we also permit explicit user-defined 2644/// conversion functions. 2645/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2646bool 2647Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2648 ImplicitConversionSequence *ICS, 2649 bool SuppressUserConversions, 2650 bool AllowExplicit, bool ForceRValue) { 2651 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2652 2653 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2654 QualType T2 = Init->getType(); 2655 2656 // If the initializer is the address of an overloaded function, try 2657 // to resolve the overloaded function. If all goes well, T2 is the 2658 // type of the resulting function. 2659 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2660 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2661 ICS != 0); 2662 if (Fn) { 2663 // Since we're performing this reference-initialization for 2664 // real, update the initializer with the resulting function. 2665 if (!ICS) { 2666 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2667 return true; 2668 2669 FixOverloadedFunctionReference(Init, Fn); 2670 } 2671 2672 T2 = Fn->getType(); 2673 } 2674 } 2675 2676 // Compute some basic properties of the types and the initializer. 2677 bool isRValRef = DeclType->isRValueReferenceType(); 2678 bool DerivedToBase = false; 2679 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2680 Init->isLvalue(Context); 2681 ReferenceCompareResult RefRelationship 2682 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2683 2684 // Most paths end in a failed conversion. 2685 if (ICS) 2686 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2687 2688 // C++ [dcl.init.ref]p5: 2689 // A reference to type “cv1 T1” is initialized by an expression 2690 // of type “cv2 T2” as follows: 2691 2692 // -- If the initializer expression 2693 2694 // Rvalue references cannot bind to lvalues (N2812). 2695 // There is absolutely no situation where they can. In particular, note that 2696 // this is ill-formed, even if B has a user-defined conversion to A&&: 2697 // B b; 2698 // A&& r = b; 2699 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2700 if (!ICS) 2701 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2702 << Init->getSourceRange(); 2703 return true; 2704 } 2705 2706 bool BindsDirectly = false; 2707 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2708 // reference-compatible with “cv2 T2,” or 2709 // 2710 // Note that the bit-field check is skipped if we are just computing 2711 // the implicit conversion sequence (C++ [over.best.ics]p2). 2712 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2713 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2714 BindsDirectly = true; 2715 2716 if (ICS) { 2717 // C++ [over.ics.ref]p1: 2718 // When a parameter of reference type binds directly (8.5.3) 2719 // to an argument expression, the implicit conversion sequence 2720 // is the identity conversion, unless the argument expression 2721 // has a type that is a derived class of the parameter type, 2722 // in which case the implicit conversion sequence is a 2723 // derived-to-base Conversion (13.3.3.1). 2724 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2725 ICS->Standard.First = ICK_Identity; 2726 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2727 ICS->Standard.Third = ICK_Identity; 2728 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2729 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2730 ICS->Standard.ReferenceBinding = true; 2731 ICS->Standard.DirectBinding = true; 2732 ICS->Standard.RRefBinding = false; 2733 ICS->Standard.CopyConstructor = 0; 2734 2735 // Nothing more to do: the inaccessibility/ambiguity check for 2736 // derived-to-base conversions is suppressed when we're 2737 // computing the implicit conversion sequence (C++ 2738 // [over.best.ics]p2). 2739 return false; 2740 } else { 2741 // Perform the conversion. 2742 // FIXME: Binding to a subobject of the lvalue is going to require more 2743 // AST annotation than this. 2744 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2745 } 2746 } 2747 2748 // -- has a class type (i.e., T2 is a class type) and can be 2749 // implicitly converted to an lvalue of type “cv3 T3,” 2750 // where “cv1 T1” is reference-compatible with “cv3 T3” 2751 // 92) (this conversion is selected by enumerating the 2752 // applicable conversion functions (13.3.1.6) and choosing 2753 // the best one through overload resolution (13.3)), 2754 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2755 // FIXME: Look for conversions in base classes! 2756 CXXRecordDecl *T2RecordDecl 2757 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2758 2759 OverloadCandidateSet CandidateSet; 2760 OverloadedFunctionDecl *Conversions 2761 = T2RecordDecl->getConversionFunctions(); 2762 for (OverloadedFunctionDecl::function_iterator Func 2763 = Conversions->function_begin(); 2764 Func != Conversions->function_end(); ++Func) { 2765 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2766 2767 // If the conversion function doesn't return a reference type, 2768 // it can't be considered for this conversion. 2769 if (Conv->getConversionType()->isLValueReferenceType() && 2770 (AllowExplicit || !Conv->isExplicit())) 2771 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2772 } 2773 2774 OverloadCandidateSet::iterator Best; 2775 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2776 case OR_Success: 2777 // This is a direct binding. 2778 BindsDirectly = true; 2779 2780 if (ICS) { 2781 // C++ [over.ics.ref]p1: 2782 // 2783 // [...] If the parameter binds directly to the result of 2784 // applying a conversion function to the argument 2785 // expression, the implicit conversion sequence is a 2786 // user-defined conversion sequence (13.3.3.1.2), with the 2787 // second standard conversion sequence either an identity 2788 // conversion or, if the conversion function returns an 2789 // entity of a type that is a derived class of the parameter 2790 // type, a derived-to-base Conversion. 2791 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2792 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2793 ICS->UserDefined.After = Best->FinalConversion; 2794 ICS->UserDefined.ConversionFunction = Best->Function; 2795 assert(ICS->UserDefined.After.ReferenceBinding && 2796 ICS->UserDefined.After.DirectBinding && 2797 "Expected a direct reference binding!"); 2798 return false; 2799 } else { 2800 // Perform the conversion. 2801 // FIXME: Binding to a subobject of the lvalue is going to require more 2802 // AST annotation than this. 2803 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2804 } 2805 break; 2806 2807 case OR_Ambiguous: 2808 assert(false && "Ambiguous reference binding conversions not implemented."); 2809 return true; 2810 2811 case OR_No_Viable_Function: 2812 case OR_Deleted: 2813 // There was no suitable conversion, or we found a deleted 2814 // conversion; continue with other checks. 2815 break; 2816 } 2817 } 2818 2819 if (BindsDirectly) { 2820 // C++ [dcl.init.ref]p4: 2821 // [...] In all cases where the reference-related or 2822 // reference-compatible relationship of two types is used to 2823 // establish the validity of a reference binding, and T1 is a 2824 // base class of T2, a program that necessitates such a binding 2825 // is ill-formed if T1 is an inaccessible (clause 11) or 2826 // ambiguous (10.2) base class of T2. 2827 // 2828 // Note that we only check this condition when we're allowed to 2829 // complain about errors, because we should not be checking for 2830 // ambiguity (or inaccessibility) unless the reference binding 2831 // actually happens. 2832 if (DerivedToBase) 2833 return CheckDerivedToBaseConversion(T2, T1, 2834 Init->getSourceRange().getBegin(), 2835 Init->getSourceRange()); 2836 else 2837 return false; 2838 } 2839 2840 // -- Otherwise, the reference shall be to a non-volatile const 2841 // type (i.e., cv1 shall be const), or the reference shall be an 2842 // rvalue reference and the initializer expression shall be an rvalue. 2843 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2844 if (!ICS) 2845 Diag(Init->getSourceRange().getBegin(), 2846 diag::err_not_reference_to_const_init) 2847 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2848 << T2 << Init->getSourceRange(); 2849 return true; 2850 } 2851 2852 // -- If the initializer expression is an rvalue, with T2 a 2853 // class type, and “cv1 T1” is reference-compatible with 2854 // “cv2 T2,” the reference is bound in one of the 2855 // following ways (the choice is implementation-defined): 2856 // 2857 // -- The reference is bound to the object represented by 2858 // the rvalue (see 3.10) or to a sub-object within that 2859 // object. 2860 // 2861 // -- A temporary of type “cv1 T2” [sic] is created, and 2862 // a constructor is called to copy the entire rvalue 2863 // object into the temporary. The reference is bound to 2864 // the temporary or to a sub-object within the 2865 // temporary. 2866 // 2867 // The constructor that would be used to make the copy 2868 // shall be callable whether or not the copy is actually 2869 // done. 2870 // 2871 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2872 // freedom, so we will always take the first option and never build 2873 // a temporary in this case. FIXME: We will, however, have to check 2874 // for the presence of a copy constructor in C++98/03 mode. 2875 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2876 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2877 if (ICS) { 2878 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2879 ICS->Standard.First = ICK_Identity; 2880 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2881 ICS->Standard.Third = ICK_Identity; 2882 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2883 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2884 ICS->Standard.ReferenceBinding = true; 2885 ICS->Standard.DirectBinding = false; 2886 ICS->Standard.RRefBinding = isRValRef; 2887 ICS->Standard.CopyConstructor = 0; 2888 } else { 2889 // FIXME: Binding to a subobject of the rvalue is going to require more 2890 // AST annotation than this. 2891 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2892 } 2893 return false; 2894 } 2895 2896 // -- Otherwise, a temporary of type “cv1 T1” is created and 2897 // initialized from the initializer expression using the 2898 // rules for a non-reference copy initialization (8.5). The 2899 // reference is then bound to the temporary. If T1 is 2900 // reference-related to T2, cv1 must be the same 2901 // cv-qualification as, or greater cv-qualification than, 2902 // cv2; otherwise, the program is ill-formed. 2903 if (RefRelationship == Ref_Related) { 2904 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2905 // we would be reference-compatible or reference-compatible with 2906 // added qualification. But that wasn't the case, so the reference 2907 // initialization fails. 2908 if (!ICS) 2909 Diag(Init->getSourceRange().getBegin(), 2910 diag::err_reference_init_drops_quals) 2911 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2912 << T2 << Init->getSourceRange(); 2913 return true; 2914 } 2915 2916 // If at least one of the types is a class type, the types are not 2917 // related, and we aren't allowed any user conversions, the 2918 // reference binding fails. This case is important for breaking 2919 // recursion, since TryImplicitConversion below will attempt to 2920 // create a temporary through the use of a copy constructor. 2921 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2922 (T1->isRecordType() || T2->isRecordType())) { 2923 if (!ICS) 2924 Diag(Init->getSourceRange().getBegin(), 2925 diag::err_typecheck_convert_incompatible) 2926 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2927 return true; 2928 } 2929 2930 // Actually try to convert the initializer to T1. 2931 if (ICS) { 2932 // C++ [over.ics.ref]p2: 2933 // 2934 // When a parameter of reference type is not bound directly to 2935 // an argument expression, the conversion sequence is the one 2936 // required to convert the argument expression to the 2937 // underlying type of the reference according to 2938 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2939 // to copy-initializing a temporary of the underlying type with 2940 // the argument expression. Any difference in top-level 2941 // cv-qualification is subsumed by the initialization itself 2942 // and does not constitute a conversion. 2943 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2944 // Of course, that's still a reference binding. 2945 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2946 ICS->Standard.ReferenceBinding = true; 2947 ICS->Standard.RRefBinding = isRValRef; 2948 } else if(ICS->ConversionKind == 2949 ImplicitConversionSequence::UserDefinedConversion) { 2950 ICS->UserDefined.After.ReferenceBinding = true; 2951 ICS->UserDefined.After.RRefBinding = isRValRef; 2952 } 2953 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2954 } else { 2955 return PerformImplicitConversion(Init, T1, "initializing"); 2956 } 2957} 2958 2959/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2960/// of this overloaded operator is well-formed. If so, returns false; 2961/// otherwise, emits appropriate diagnostics and returns true. 2962bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2963 assert(FnDecl && FnDecl->isOverloadedOperator() && 2964 "Expected an overloaded operator declaration"); 2965 2966 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2967 2968 // C++ [over.oper]p5: 2969 // The allocation and deallocation functions, operator new, 2970 // operator new[], operator delete and operator delete[], are 2971 // described completely in 3.7.3. The attributes and restrictions 2972 // found in the rest of this subclause do not apply to them unless 2973 // explicitly stated in 3.7.3. 2974 // FIXME: Write a separate routine for checking this. For now, just allow it. 2975 if (Op == OO_New || Op == OO_Array_New || 2976 Op == OO_Delete || Op == OO_Array_Delete) 2977 return false; 2978 2979 // C++ [over.oper]p6: 2980 // An operator function shall either be a non-static member 2981 // function or be a non-member function and have at least one 2982 // parameter whose type is a class, a reference to a class, an 2983 // enumeration, or a reference to an enumeration. 2984 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2985 if (MethodDecl->isStatic()) 2986 return Diag(FnDecl->getLocation(), 2987 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2988 } else { 2989 bool ClassOrEnumParam = false; 2990 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2991 ParamEnd = FnDecl->param_end(); 2992 Param != ParamEnd; ++Param) { 2993 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2994 if (ParamType->isDependentType() || ParamType->isRecordType() || 2995 ParamType->isEnumeralType()) { 2996 ClassOrEnumParam = true; 2997 break; 2998 } 2999 } 3000 3001 if (!ClassOrEnumParam) 3002 return Diag(FnDecl->getLocation(), 3003 diag::err_operator_overload_needs_class_or_enum) 3004 << FnDecl->getDeclName(); 3005 } 3006 3007 // C++ [over.oper]p8: 3008 // An operator function cannot have default arguments (8.3.6), 3009 // except where explicitly stated below. 3010 // 3011 // Only the function-call operator allows default arguments 3012 // (C++ [over.call]p1). 3013 if (Op != OO_Call) { 3014 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3015 Param != FnDecl->param_end(); ++Param) { 3016 if ((*Param)->hasUnparsedDefaultArg()) 3017 return Diag((*Param)->getLocation(), 3018 diag::err_operator_overload_default_arg) 3019 << FnDecl->getDeclName(); 3020 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3021 return Diag((*Param)->getLocation(), 3022 diag::err_operator_overload_default_arg) 3023 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3024 } 3025 } 3026 3027 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3028 { false, false, false } 3029#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3030 , { Unary, Binary, MemberOnly } 3031#include "clang/Basic/OperatorKinds.def" 3032 }; 3033 3034 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3035 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3036 bool MustBeMemberOperator = OperatorUses[Op][2]; 3037 3038 // C++ [over.oper]p8: 3039 // [...] Operator functions cannot have more or fewer parameters 3040 // than the number required for the corresponding operator, as 3041 // described in the rest of this subclause. 3042 unsigned NumParams = FnDecl->getNumParams() 3043 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3044 if (Op != OO_Call && 3045 ((NumParams == 1 && !CanBeUnaryOperator) || 3046 (NumParams == 2 && !CanBeBinaryOperator) || 3047 (NumParams < 1) || (NumParams > 2))) { 3048 // We have the wrong number of parameters. 3049 unsigned ErrorKind; 3050 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3051 ErrorKind = 2; // 2 -> unary or binary. 3052 } else if (CanBeUnaryOperator) { 3053 ErrorKind = 0; // 0 -> unary 3054 } else { 3055 assert(CanBeBinaryOperator && 3056 "All non-call overloaded operators are unary or binary!"); 3057 ErrorKind = 1; // 1 -> binary 3058 } 3059 3060 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3061 << FnDecl->getDeclName() << NumParams << ErrorKind; 3062 } 3063 3064 // Overloaded operators other than operator() cannot be variadic. 3065 if (Op != OO_Call && 3066 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3067 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3068 << FnDecl->getDeclName(); 3069 } 3070 3071 // Some operators must be non-static member functions. 3072 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3073 return Diag(FnDecl->getLocation(), 3074 diag::err_operator_overload_must_be_member) 3075 << FnDecl->getDeclName(); 3076 } 3077 3078 // C++ [over.inc]p1: 3079 // The user-defined function called operator++ implements the 3080 // prefix and postfix ++ operator. If this function is a member 3081 // function with no parameters, or a non-member function with one 3082 // parameter of class or enumeration type, it defines the prefix 3083 // increment operator ++ for objects of that type. If the function 3084 // is a member function with one parameter (which shall be of type 3085 // int) or a non-member function with two parameters (the second 3086 // of which shall be of type int), it defines the postfix 3087 // increment operator ++ for objects of that type. 3088 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3089 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3090 bool ParamIsInt = false; 3091 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3092 ParamIsInt = BT->getKind() == BuiltinType::Int; 3093 3094 if (!ParamIsInt) 3095 return Diag(LastParam->getLocation(), 3096 diag::err_operator_overload_post_incdec_must_be_int) 3097 << LastParam->getType() << (Op == OO_MinusMinus); 3098 } 3099 3100 // Notify the class if it got an assignment operator. 3101 if (Op == OO_Equal) { 3102 // Would have returned earlier otherwise. 3103 assert(isa<CXXMethodDecl>(FnDecl) && 3104 "Overloaded = not member, but not filtered."); 3105 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3106 Method->getParent()->addedAssignmentOperator(Context, Method); 3107 } 3108 3109 return false; 3110} 3111 3112/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3113/// linkage specification, including the language and (if present) 3114/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3115/// the location of the language string literal, which is provided 3116/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3117/// the '{' brace. Otherwise, this linkage specification does not 3118/// have any braces. 3119Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3120 SourceLocation ExternLoc, 3121 SourceLocation LangLoc, 3122 const char *Lang, 3123 unsigned StrSize, 3124 SourceLocation LBraceLoc) { 3125 LinkageSpecDecl::LanguageIDs Language; 3126 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3127 Language = LinkageSpecDecl::lang_c; 3128 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3129 Language = LinkageSpecDecl::lang_cxx; 3130 else { 3131 Diag(LangLoc, diag::err_bad_language); 3132 return DeclPtrTy(); 3133 } 3134 3135 // FIXME: Add all the various semantics of linkage specifications 3136 3137 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3138 LangLoc, Language, 3139 LBraceLoc.isValid()); 3140 CurContext->addDecl(D); 3141 PushDeclContext(S, D); 3142 return DeclPtrTy::make(D); 3143} 3144 3145/// ActOnFinishLinkageSpecification - Completely the definition of 3146/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3147/// valid, it's the position of the closing '}' brace in a linkage 3148/// specification that uses braces. 3149Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3150 DeclPtrTy LinkageSpec, 3151 SourceLocation RBraceLoc) { 3152 if (LinkageSpec) 3153 PopDeclContext(); 3154 return LinkageSpec; 3155} 3156 3157/// \brief Perform semantic analysis for the variable declaration that 3158/// occurs within a C++ catch clause, returning the newly-created 3159/// variable. 3160VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3161 IdentifierInfo *Name, 3162 SourceLocation Loc, 3163 SourceRange Range) { 3164 bool Invalid = false; 3165 3166 // Arrays and functions decay. 3167 if (ExDeclType->isArrayType()) 3168 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3169 else if (ExDeclType->isFunctionType()) 3170 ExDeclType = Context.getPointerType(ExDeclType); 3171 3172 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3173 // The exception-declaration shall not denote a pointer or reference to an 3174 // incomplete type, other than [cv] void*. 3175 // N2844 forbids rvalue references. 3176 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3177 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3178 Invalid = true; 3179 } 3180 3181 QualType BaseType = ExDeclType; 3182 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3183 unsigned DK = diag::err_catch_incomplete; 3184 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3185 BaseType = Ptr->getPointeeType(); 3186 Mode = 1; 3187 DK = diag::err_catch_incomplete_ptr; 3188 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3189 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3190 BaseType = Ref->getPointeeType(); 3191 Mode = 2; 3192 DK = diag::err_catch_incomplete_ref; 3193 } 3194 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3195 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3196 Invalid = true; 3197 3198 if (!Invalid && !ExDeclType->isDependentType() && 3199 RequireNonAbstractType(Loc, ExDeclType, 3200 diag::err_abstract_type_in_decl, 3201 AbstractVariableType)) 3202 Invalid = true; 3203 3204 // FIXME: Need to test for ability to copy-construct and destroy the 3205 // exception variable. 3206 3207 // FIXME: Need to check for abstract classes. 3208 3209 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3210 Name, ExDeclType, VarDecl::None, 3211 Range.getBegin()); 3212 3213 if (Invalid) 3214 ExDecl->setInvalidDecl(); 3215 3216 return ExDecl; 3217} 3218 3219/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3220/// handler. 3221Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3222 QualType ExDeclType = GetTypeForDeclarator(D, S); 3223 3224 bool Invalid = D.isInvalidType(); 3225 IdentifierInfo *II = D.getIdentifier(); 3226 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3227 // The scope should be freshly made just for us. There is just no way 3228 // it contains any previous declaration. 3229 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3230 if (PrevDecl->isTemplateParameter()) { 3231 // Maybe we will complain about the shadowed template parameter. 3232 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3233 } 3234 } 3235 3236 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3237 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3238 << D.getCXXScopeSpec().getRange(); 3239 Invalid = true; 3240 } 3241 3242 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3243 D.getIdentifier(), 3244 D.getIdentifierLoc(), 3245 D.getDeclSpec().getSourceRange()); 3246 3247 if (Invalid) 3248 ExDecl->setInvalidDecl(); 3249 3250 // Add the exception declaration into this scope. 3251 if (II) 3252 PushOnScopeChains(ExDecl, S); 3253 else 3254 CurContext->addDecl(ExDecl); 3255 3256 ProcessDeclAttributes(S, ExDecl, D); 3257 return DeclPtrTy::make(ExDecl); 3258} 3259 3260Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3261 ExprArg assertexpr, 3262 ExprArg assertmessageexpr) { 3263 Expr *AssertExpr = (Expr *)assertexpr.get(); 3264 StringLiteral *AssertMessage = 3265 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3266 3267 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3268 llvm::APSInt Value(32); 3269 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3270 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3271 AssertExpr->getSourceRange(); 3272 return DeclPtrTy(); 3273 } 3274 3275 if (Value == 0) { 3276 std::string str(AssertMessage->getStrData(), 3277 AssertMessage->getByteLength()); 3278 Diag(AssertLoc, diag::err_static_assert_failed) 3279 << str << AssertExpr->getSourceRange(); 3280 } 3281 } 3282 3283 assertexpr.release(); 3284 assertmessageexpr.release(); 3285 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3286 AssertExpr, AssertMessage); 3287 3288 CurContext->addDecl(Decl); 3289 return DeclPtrTy::make(Decl); 3290} 3291 3292bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3293 if (!(S->getFlags() & Scope::ClassScope)) { 3294 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3295 return true; 3296 } 3297 3298 return false; 3299} 3300 3301void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3302 Decl *Dcl = dcl.getAs<Decl>(); 3303 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3304 if (!Fn) { 3305 Diag(DelLoc, diag::err_deleted_non_function); 3306 return; 3307 } 3308 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3309 Diag(DelLoc, diag::err_deleted_decl_not_first); 3310 Diag(Prev->getLocation(), diag::note_previous_declaration); 3311 // If the declaration wasn't the first, we delete the function anyway for 3312 // recovery. 3313 } 3314 Fn->setDeleted(); 3315} 3316 3317static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3318 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3319 ++CI) { 3320 Stmt *SubStmt = *CI; 3321 if (!SubStmt) 3322 continue; 3323 if (isa<ReturnStmt>(SubStmt)) 3324 Self.Diag(SubStmt->getSourceRange().getBegin(), 3325 diag::err_return_in_constructor_handler); 3326 if (!isa<Expr>(SubStmt)) 3327 SearchForReturnInStmt(Self, SubStmt); 3328 } 3329} 3330 3331void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3332 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3333 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3334 SearchForReturnInStmt(*this, Handler); 3335 } 3336} 3337 3338bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3339 const CXXMethodDecl *Old) { 3340 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3341 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3342 3343 QualType CNewTy = Context.getCanonicalType(NewTy); 3344 QualType COldTy = Context.getCanonicalType(OldTy); 3345 3346 if (CNewTy == COldTy && 3347 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3348 return false; 3349 3350 // Check if the return types are covariant 3351 QualType NewClassTy, OldClassTy; 3352 3353 /// Both types must be pointers or references to classes. 3354 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3355 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3356 NewClassTy = NewPT->getPointeeType(); 3357 OldClassTy = OldPT->getPointeeType(); 3358 } 3359 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3360 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3361 NewClassTy = NewRT->getPointeeType(); 3362 OldClassTy = OldRT->getPointeeType(); 3363 } 3364 } 3365 3366 // The return types aren't either both pointers or references to a class type. 3367 if (NewClassTy.isNull()) { 3368 Diag(New->getLocation(), 3369 diag::err_different_return_type_for_overriding_virtual_function) 3370 << New->getDeclName() << NewTy << OldTy; 3371 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3372 3373 return true; 3374 } 3375 3376 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3377 // Check if the new class derives from the old class. 3378 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3379 Diag(New->getLocation(), 3380 diag::err_covariant_return_not_derived) 3381 << New->getDeclName() << NewTy << OldTy; 3382 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3383 return true; 3384 } 3385 3386 // Check if we the conversion from derived to base is valid. 3387 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3388 diag::err_covariant_return_inaccessible_base, 3389 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3390 // FIXME: Should this point to the return type? 3391 New->getLocation(), SourceRange(), New->getDeclName())) { 3392 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3393 return true; 3394 } 3395 } 3396 3397 // The qualifiers of the return types must be the same. 3398 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3399 Diag(New->getLocation(), 3400 diag::err_covariant_return_type_different_qualifications) 3401 << New->getDeclName() << NewTy << OldTy; 3402 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3403 return true; 3404 }; 3405 3406 3407 // The new class type must have the same or less qualifiers as the old type. 3408 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3409 Diag(New->getLocation(), 3410 diag::err_covariant_return_type_class_type_more_qualified) 3411 << New->getDeclName() << NewTy << OldTy; 3412 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3413 return true; 3414 }; 3415 3416 return false; 3417} 3418 3419bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3420 const CXXMethodDecl *Old) 3421{ 3422 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3423 diag::note_overridden_virtual_function, 3424 Old->getType()->getAsFunctionProtoType(), 3425 Old->getLocation(), 3426 New->getType()->getAsFunctionProtoType(), 3427 New->getLocation()); 3428} 3429 3430/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3431/// initializer for the declaration 'Dcl'. 3432/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3433/// static data member of class X, names should be looked up in the scope of 3434/// class X. 3435void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3436 Decl *D = Dcl.getAs<Decl>(); 3437 // If there is no declaration, there was an error parsing it. 3438 if (D == 0) 3439 return; 3440 3441 // Check whether it is a declaration with a nested name specifier like 3442 // int foo::bar; 3443 if (!D->isOutOfLine()) 3444 return; 3445 3446 // C++ [basic.lookup.unqual]p13 3447 // 3448 // A name used in the definition of a static data member of class X 3449 // (after the qualified-id of the static member) is looked up as if the name 3450 // was used in a member function of X. 3451 3452 // Change current context into the context of the initializing declaration. 3453 EnterDeclaratorContext(S, D->getDeclContext()); 3454} 3455 3456/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3457/// initializer for the declaration 'Dcl'. 3458void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3459 Decl *D = Dcl.getAs<Decl>(); 3460 // If there is no declaration, there was an error parsing it. 3461 if (D == 0) 3462 return; 3463 3464 // Check whether it is a declaration with a nested name specifier like 3465 // int foo::bar; 3466 if (!D->isOutOfLine()) 3467 return; 3468 3469 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3470 ExitDeclaratorContext(S); 3471} 3472