SemaDeclCXX.cpp revision 88232aadbe3e9b6dde2a9b0d7c91e677305de06a
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 or isn't empty, the new one is/isn't, 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 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 392 assert(CXXBaseDecl && "Base type is not a C++ type"); 393 if (!CXXBaseDecl->isEmpty()) 394 Class->setEmpty(false); 395 if (CXXBaseDecl->isPolymorphic()) 396 Class->setPolymorphic(true); 397 398 // C++ [dcl.init.aggr]p1: 399 // An aggregate is [...] a class with [...] no base classes [...]. 400 Class->setAggregate(false); 401 Class->setPOD(false); 402 403 if (Virtual) { 404 // C++ [class.ctor]p5: 405 // A constructor is trivial if its class has no virtual base classes. 406 Class->setHasTrivialConstructor(false); 407 408 // C++ [class.copy]p6: 409 // A copy constructor is trivial if its class has no virtual base classes. 410 Class->setHasTrivialCopyConstructor(false); 411 412 // C++ [class.copy]p11: 413 // A copy assignment operator is trivial if its class has no virtual 414 // base classes. 415 Class->setHasTrivialCopyAssignment(false); 416 417 // C++0x [meta.unary.prop] is_empty: 418 // T is a class type, but not a union type, with ... no virtual base 419 // classes 420 Class->setEmpty(false); 421 } else { 422 // C++ [class.ctor]p5: 423 // A constructor is trivial if all the direct base classes of its 424 // class have trivial constructors. 425 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 426 Class->setHasTrivialConstructor(false); 427 428 // C++ [class.copy]p6: 429 // A copy constructor is trivial if all the direct base classes of its 430 // class have trivial copy constructors. 431 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 432 Class->setHasTrivialCopyConstructor(false); 433 434 // C++ [class.copy]p11: 435 // A copy assignment operator is trivial if all the direct base classes 436 // of its class have trivial copy assignment operators. 437 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 438 Class->setHasTrivialCopyAssignment(false); 439 } 440 441 // C++ [class.ctor]p3: 442 // A destructor is trivial if all the direct base classes of its class 443 // have trivial destructors. 444 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 445 Class->setHasTrivialDestructor(false); 446 447 // Create the base specifier. 448 // FIXME: Allocate via ASTContext? 449 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 450 Class->getTagKind() == RecordDecl::TK_class, 451 Access, BaseType); 452} 453 454/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 455/// one entry in the base class list of a class specifier, for 456/// example: 457/// class foo : public bar, virtual private baz { 458/// 'public bar' and 'virtual private baz' are each base-specifiers. 459Sema::BaseResult 460Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 461 bool Virtual, AccessSpecifier Access, 462 TypeTy *basetype, SourceLocation BaseLoc) { 463 if (!classdecl) 464 return true; 465 466 AdjustDeclIfTemplate(classdecl); 467 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 468 QualType BaseType = QualType::getFromOpaquePtr(basetype); 469 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 470 Virtual, Access, 471 BaseType, BaseLoc)) 472 return BaseSpec; 473 474 return true; 475} 476 477/// \brief Performs the actual work of attaching the given base class 478/// specifiers to a C++ class. 479bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 480 unsigned NumBases) { 481 if (NumBases == 0) 482 return false; 483 484 // Used to keep track of which base types we have already seen, so 485 // that we can properly diagnose redundant direct base types. Note 486 // that the key is always the unqualified canonical type of the base 487 // class. 488 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 489 490 // Copy non-redundant base specifiers into permanent storage. 491 unsigned NumGoodBases = 0; 492 bool Invalid = false; 493 for (unsigned idx = 0; idx < NumBases; ++idx) { 494 QualType NewBaseType 495 = Context.getCanonicalType(Bases[idx]->getType()); 496 NewBaseType = NewBaseType.getUnqualifiedType(); 497 498 if (KnownBaseTypes[NewBaseType]) { 499 // C++ [class.mi]p3: 500 // A class shall not be specified as a direct base class of a 501 // derived class more than once. 502 Diag(Bases[idx]->getSourceRange().getBegin(), 503 diag::err_duplicate_base_class) 504 << KnownBaseTypes[NewBaseType]->getType() 505 << Bases[idx]->getSourceRange(); 506 507 // Delete the duplicate base class specifier; we're going to 508 // overwrite its pointer later. 509 Context.Deallocate(Bases[idx]); 510 511 Invalid = true; 512 } else { 513 // Okay, add this new base class. 514 KnownBaseTypes[NewBaseType] = Bases[idx]; 515 Bases[NumGoodBases++] = Bases[idx]; 516 } 517 } 518 519 // Attach the remaining base class specifiers to the derived class. 520 Class->setBases(Context, Bases, NumGoodBases); 521 522 // Delete the remaining (good) base class specifiers, since their 523 // data has been copied into the CXXRecordDecl. 524 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 525 Context.Deallocate(Bases[idx]); 526 527 return Invalid; 528} 529 530/// ActOnBaseSpecifiers - Attach the given base specifiers to the 531/// class, after checking whether there are any duplicate base 532/// classes. 533void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 534 unsigned NumBases) { 535 if (!ClassDecl || !Bases || !NumBases) 536 return; 537 538 AdjustDeclIfTemplate(ClassDecl); 539 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 540 (CXXBaseSpecifier**)(Bases), NumBases); 541} 542 543//===----------------------------------------------------------------------===// 544// C++ class member Handling 545//===----------------------------------------------------------------------===// 546 547/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 548/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 549/// bitfield width if there is one and 'InitExpr' specifies the initializer if 550/// any. 551Sema::DeclPtrTy 552Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 553 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 554 const DeclSpec &DS = D.getDeclSpec(); 555 DeclarationName Name = GetNameForDeclarator(D); 556 Expr *BitWidth = static_cast<Expr*>(BW); 557 Expr *Init = static_cast<Expr*>(InitExpr); 558 SourceLocation Loc = D.getIdentifierLoc(); 559 560 bool isFunc = D.isFunctionDeclarator(); 561 562 assert(!DS.isFriendSpecified()); 563 564 // C++ 9.2p6: A member shall not be declared to have automatic storage 565 // duration (auto, register) or with the extern storage-class-specifier. 566 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 567 // data members and cannot be applied to names declared const or static, 568 // and cannot be applied to reference members. 569 switch (DS.getStorageClassSpec()) { 570 case DeclSpec::SCS_unspecified: 571 case DeclSpec::SCS_typedef: 572 case DeclSpec::SCS_static: 573 // FALL THROUGH. 574 break; 575 case DeclSpec::SCS_mutable: 576 if (isFunc) { 577 if (DS.getStorageClassSpecLoc().isValid()) 578 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 579 else 580 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 581 582 // FIXME: It would be nicer if the keyword was ignored only for this 583 // declarator. Otherwise we could get follow-up errors. 584 D.getMutableDeclSpec().ClearStorageClassSpecs(); 585 } else { 586 QualType T = GetTypeForDeclarator(D, S); 587 diag::kind err = static_cast<diag::kind>(0); 588 if (T->isReferenceType()) 589 err = diag::err_mutable_reference; 590 else if (T.isConstQualified()) 591 err = diag::err_mutable_const; 592 if (err != 0) { 593 if (DS.getStorageClassSpecLoc().isValid()) 594 Diag(DS.getStorageClassSpecLoc(), err); 595 else 596 Diag(DS.getThreadSpecLoc(), err); 597 // FIXME: It would be nicer if the keyword was ignored only for this 598 // declarator. Otherwise we could get follow-up errors. 599 D.getMutableDeclSpec().ClearStorageClassSpecs(); 600 } 601 } 602 break; 603 default: 604 if (DS.getStorageClassSpecLoc().isValid()) 605 Diag(DS.getStorageClassSpecLoc(), 606 diag::err_storageclass_invalid_for_member); 607 else 608 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 609 D.getMutableDeclSpec().ClearStorageClassSpecs(); 610 } 611 612 if (!isFunc && 613 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 614 D.getNumTypeObjects() == 0) { 615 // Check also for this case: 616 // 617 // typedef int f(); 618 // f a; 619 // 620 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 621 isFunc = TDType->isFunctionType(); 622 } 623 624 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 625 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 626 !isFunc); 627 628 Decl *Member; 629 if (isInstField) { 630 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 631 AS); 632 assert(Member && "HandleField never returns null"); 633 } else { 634 Member = ActOnDeclarator(S, D).getAs<Decl>(); 635 if (!Member) { 636 if (BitWidth) DeleteExpr(BitWidth); 637 return DeclPtrTy(); 638 } 639 640 // Non-instance-fields can't have a bitfield. 641 if (BitWidth) { 642 if (Member->isInvalidDecl()) { 643 // don't emit another diagnostic. 644 } else if (isa<VarDecl>(Member)) { 645 // C++ 9.6p3: A bit-field shall not be a static member. 646 // "static member 'A' cannot be a bit-field" 647 Diag(Loc, diag::err_static_not_bitfield) 648 << Name << BitWidth->getSourceRange(); 649 } else if (isa<TypedefDecl>(Member)) { 650 // "typedef member 'x' cannot be a bit-field" 651 Diag(Loc, diag::err_typedef_not_bitfield) 652 << Name << BitWidth->getSourceRange(); 653 } else { 654 // A function typedef ("typedef int f(); f a;"). 655 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 656 Diag(Loc, diag::err_not_integral_type_bitfield) 657 << Name << cast<ValueDecl>(Member)->getType() 658 << BitWidth->getSourceRange(); 659 } 660 661 DeleteExpr(BitWidth); 662 BitWidth = 0; 663 Member->setInvalidDecl(); 664 } 665 666 Member->setAccess(AS); 667 } 668 669 assert((Name || isInstField) && "No identifier for non-field ?"); 670 671 if (Init) 672 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 673 if (Deleted) // FIXME: Source location is not very good. 674 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 675 676 if (isInstField) { 677 FieldCollector->Add(cast<FieldDecl>(Member)); 678 return DeclPtrTy(); 679 } 680 return DeclPtrTy::make(Member); 681} 682 683/// ActOnMemInitializer - Handle a C++ member initializer. 684Sema::MemInitResult 685Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 686 Scope *S, 687 const CXXScopeSpec &SS, 688 IdentifierInfo *MemberOrBase, 689 TypeTy *TemplateTypeTy, 690 SourceLocation IdLoc, 691 SourceLocation LParenLoc, 692 ExprTy **Args, unsigned NumArgs, 693 SourceLocation *CommaLocs, 694 SourceLocation RParenLoc) { 695 if (!ConstructorD) 696 return true; 697 698 CXXConstructorDecl *Constructor 699 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 700 if (!Constructor) { 701 // The user wrote a constructor initializer on a function that is 702 // not a C++ constructor. Ignore the error for now, because we may 703 // have more member initializers coming; we'll diagnose it just 704 // once in ActOnMemInitializers. 705 return true; 706 } 707 708 CXXRecordDecl *ClassDecl = Constructor->getParent(); 709 710 // C++ [class.base.init]p2: 711 // Names in a mem-initializer-id are looked up in the scope of the 712 // constructor’s class and, if not found in that scope, are looked 713 // up in the scope containing the constructor’s 714 // definition. [Note: if the constructor’s class contains a member 715 // with the same name as a direct or virtual base class of the 716 // class, a mem-initializer-id naming the member or base class and 717 // composed of a single identifier refers to the class member. A 718 // mem-initializer-id for the hidden base class may be specified 719 // using a qualified name. ] 720 if (!SS.getScopeRep() && !TemplateTypeTy) { 721 // Look for a member, first. 722 FieldDecl *Member = 0; 723 DeclContext::lookup_result Result 724 = ClassDecl->lookup(MemberOrBase); 725 if (Result.first != Result.second) 726 Member = dyn_cast<FieldDecl>(*Result.first); 727 728 // FIXME: Handle members of an anonymous union. 729 730 if (Member) 731 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 732 RParenLoc); 733 } 734 // It didn't name a member, so see if it names a class. 735 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 736 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 737 if (!BaseTy) 738 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 739 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 740 741 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 742 743 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 744 RParenLoc, ClassDecl); 745} 746 747Sema::MemInitResult 748Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 749 unsigned NumArgs, SourceLocation IdLoc, 750 SourceLocation RParenLoc) { 751 bool HasDependentArg = false; 752 for (unsigned i = 0; i < NumArgs; i++) 753 HasDependentArg |= Args[i]->isTypeDependent(); 754 755 CXXConstructorDecl *C = 0; 756 QualType FieldType = Member->getType(); 757 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 758 FieldType = Array->getElementType(); 759 if (FieldType->isDependentType()) { 760 // Can't check init for dependent type. 761 } else if (FieldType->getAs<RecordType>()) { 762 if (!HasDependentArg) 763 C = PerformInitializationByConstructor( 764 FieldType, (Expr **)Args, NumArgs, IdLoc, 765 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 766 } else if (NumArgs != 1) { 767 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 768 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 769 } else if (!HasDependentArg) { 770 Expr *NewExp = (Expr*)Args[0]; 771 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 772 return true; 773 Args[0] = NewExp; 774 } 775 // FIXME: Perform direct initialization of the member. 776 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 777 NumArgs, C, IdLoc); 778} 779 780Sema::MemInitResult 781Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 782 unsigned NumArgs, SourceLocation IdLoc, 783 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 784 bool HasDependentArg = false; 785 for (unsigned i = 0; i < NumArgs; i++) 786 HasDependentArg |= Args[i]->isTypeDependent(); 787 788 if (!BaseType->isDependentType()) { 789 if (!BaseType->isRecordType()) 790 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 791 << BaseType << SourceRange(IdLoc, RParenLoc); 792 793 // C++ [class.base.init]p2: 794 // [...] Unless the mem-initializer-id names a nonstatic data 795 // member of the constructor’s class or a direct or virtual base 796 // of that class, the mem-initializer is ill-formed. A 797 // mem-initializer-list can initialize a base class using any 798 // name that denotes that base class type. 799 800 // First, check for a direct base class. 801 const CXXBaseSpecifier *DirectBaseSpec = 0; 802 for (CXXRecordDecl::base_class_const_iterator Base = 803 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 804 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 805 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 806 // We found a direct base of this type. That's what we're 807 // initializing. 808 DirectBaseSpec = &*Base; 809 break; 810 } 811 } 812 813 // Check for a virtual base class. 814 // FIXME: We might be able to short-circuit this if we know in advance that 815 // there are no virtual bases. 816 const CXXBaseSpecifier *VirtualBaseSpec = 0; 817 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 818 // We haven't found a base yet; search the class hierarchy for a 819 // virtual base class. 820 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 821 /*DetectVirtual=*/false); 822 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 823 for (BasePaths::paths_iterator Path = Paths.begin(); 824 Path != Paths.end(); ++Path) { 825 if (Path->back().Base->isVirtual()) { 826 VirtualBaseSpec = Path->back().Base; 827 break; 828 } 829 } 830 } 831 } 832 833 // C++ [base.class.init]p2: 834 // If a mem-initializer-id is ambiguous because it designates both 835 // a direct non-virtual base class and an inherited virtual base 836 // class, the mem-initializer is ill-formed. 837 if (DirectBaseSpec && VirtualBaseSpec) 838 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 839 << BaseType << SourceRange(IdLoc, RParenLoc); 840 // C++ [base.class.init]p2: 841 // Unless the mem-initializer-id names a nonstatic data membeer of the 842 // constructor's class ot a direst or virtual base of that class, the 843 // mem-initializer is ill-formed. 844 if (!DirectBaseSpec && !VirtualBaseSpec) 845 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 846 << BaseType << ClassDecl->getNameAsCString() 847 << SourceRange(IdLoc, RParenLoc); 848 } 849 850 CXXConstructorDecl *C = 0; 851 if (!BaseType->isDependentType() && !HasDependentArg) { 852 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 853 Context.getCanonicalType(BaseType)); 854 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 855 IdLoc, SourceRange(IdLoc, RParenLoc), 856 Name, IK_Direct); 857 } 858 859 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 860 NumArgs, C, IdLoc); 861} 862 863void 864Sema::BuildBaseOrMemberInitializers(ASTContext &C, 865 CXXConstructorDecl *Constructor, 866 CXXBaseOrMemberInitializer **Initializers, 867 unsigned NumInitializers 868 ) { 869 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 870 llvm::SmallVector<FieldDecl *, 4>Members; 871 872 Constructor->setBaseOrMemberInitializers(C, 873 Initializers, NumInitializers, 874 Bases, Members); 875 for (unsigned int i = 0; i < Bases.size(); i++) 876 Diag(Bases[i]->getSourceRange().getBegin(), 877 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 878 for (unsigned int i = 0; i < Members.size(); i++) 879 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 880 << 1 << Members[i]->getType(); 881} 882 883static void *GetKeyForTopLevelField(FieldDecl *Field) { 884 // For anonymous unions, use the class declaration as the key. 885 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 886 if (RT->getDecl()->isAnonymousStructOrUnion()) 887 return static_cast<void *>(RT->getDecl()); 888 } 889 return static_cast<void *>(Field); 890} 891 892static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 893 bool MemberMaybeAnon=false) { 894 // For fields injected into the class via declaration of an anonymous union, 895 // use its anonymous union class declaration as the unique key. 896 if (FieldDecl *Field = Member->getMember()) { 897 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 898 // data member of the class. Data member used in the initializer list is 899 // in AnonUnionMember field. 900 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 901 Field = Member->getAnonUnionMember(); 902 if (Field->getDeclContext()->isRecord()) { 903 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 904 if (RD->isAnonymousStructOrUnion()) 905 return static_cast<void *>(RD); 906 } 907 return static_cast<void *>(Field); 908 } 909 return static_cast<RecordType *>(Member->getBaseClass()); 910} 911 912void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 913 SourceLocation ColonLoc, 914 MemInitTy **MemInits, unsigned NumMemInits) { 915 if (!ConstructorDecl) 916 return; 917 918 CXXConstructorDecl *Constructor 919 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 920 921 if (!Constructor) { 922 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 923 return; 924 } 925 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 926 bool err = false; 927 for (unsigned i = 0; i < NumMemInits; i++) { 928 CXXBaseOrMemberInitializer *Member = 929 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 930 void *KeyToMember = GetKeyForMember(Member); 931 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 932 if (!PrevMember) { 933 PrevMember = Member; 934 continue; 935 } 936 if (FieldDecl *Field = Member->getMember()) 937 Diag(Member->getSourceLocation(), 938 diag::error_multiple_mem_initialization) 939 << Field->getNameAsString(); 940 else { 941 Type *BaseClass = Member->getBaseClass(); 942 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 943 Diag(Member->getSourceLocation(), 944 diag::error_multiple_base_initialization) 945 << BaseClass->getDesugaredType(true); 946 } 947 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 948 << 0; 949 err = true; 950 } 951 if (!err) 952 BuildBaseOrMemberInitializers(Context, Constructor, 953 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 954 NumMemInits); 955 956 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 957 != Diagnostic::Ignored || 958 Diags.getDiagnosticLevel(diag::warn_field_initialized) 959 != Diagnostic::Ignored)) { 960 // Also issue warning if order of ctor-initializer list does not match order 961 // of 1) base class declarations and 2) order of non-static data members. 962 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 963 964 CXXRecordDecl *ClassDecl 965 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 966 // Push virtual bases before others. 967 for (CXXRecordDecl::base_class_iterator VBase = 968 ClassDecl->vbases_begin(), 969 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 970 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 971 972 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 973 E = ClassDecl->bases_end(); Base != E; ++Base) { 974 // Virtuals are alread in the virtual base list and are constructed 975 // first. 976 if (Base->isVirtual()) 977 continue; 978 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 979 } 980 981 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 982 E = ClassDecl->field_end(); Field != E; ++Field) 983 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 984 985 int Last = AllBaseOrMembers.size(); 986 int curIndex = 0; 987 CXXBaseOrMemberInitializer *PrevMember = 0; 988 for (unsigned i = 0; i < NumMemInits; i++) { 989 CXXBaseOrMemberInitializer *Member = 990 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 991 void *MemberInCtorList = GetKeyForMember(Member, true); 992 993 for (; curIndex < Last; curIndex++) 994 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 995 break; 996 if (curIndex == Last) { 997 assert(PrevMember && "Member not in member list?!"); 998 // Initializer as specified in ctor-initializer list is out of order. 999 // Issue a warning diagnostic. 1000 if (PrevMember->isBaseInitializer()) { 1001 // Diagnostics is for an initialized base class. 1002 Type *BaseClass = PrevMember->getBaseClass(); 1003 Diag(PrevMember->getSourceLocation(), 1004 diag::warn_base_initialized) 1005 << BaseClass->getDesugaredType(true); 1006 } else { 1007 FieldDecl *Field = PrevMember->getMember(); 1008 Diag(PrevMember->getSourceLocation(), 1009 diag::warn_field_initialized) 1010 << Field->getNameAsString(); 1011 } 1012 // Also the note! 1013 if (FieldDecl *Field = Member->getMember()) 1014 Diag(Member->getSourceLocation(), 1015 diag::note_fieldorbase_initialized_here) << 0 1016 << Field->getNameAsString(); 1017 else { 1018 Type *BaseClass = Member->getBaseClass(); 1019 Diag(Member->getSourceLocation(), 1020 diag::note_fieldorbase_initialized_here) << 1 1021 << BaseClass->getDesugaredType(true); 1022 } 1023 for (curIndex = 0; curIndex < Last; curIndex++) 1024 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1025 break; 1026 } 1027 PrevMember = Member; 1028 } 1029 } 1030} 1031 1032void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1033 if (!CDtorDecl) 1034 return; 1035 1036 if (CXXConstructorDecl *Constructor 1037 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1038 BuildBaseOrMemberInitializers(Context, 1039 Constructor, 1040 (CXXBaseOrMemberInitializer **)0, 0); 1041} 1042 1043namespace { 1044 /// PureVirtualMethodCollector - traverses a class and its superclasses 1045 /// and determines if it has any pure virtual methods. 1046 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1047 ASTContext &Context; 1048 1049 public: 1050 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1051 1052 private: 1053 MethodList Methods; 1054 1055 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1056 1057 public: 1058 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1059 : Context(Ctx) { 1060 1061 MethodList List; 1062 Collect(RD, List); 1063 1064 // Copy the temporary list to methods, and make sure to ignore any 1065 // null entries. 1066 for (size_t i = 0, e = List.size(); i != e; ++i) { 1067 if (List[i]) 1068 Methods.push_back(List[i]); 1069 } 1070 } 1071 1072 bool empty() const { return Methods.empty(); } 1073 1074 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1075 MethodList::const_iterator methods_end() { return Methods.end(); } 1076 }; 1077 1078 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1079 MethodList& Methods) { 1080 // First, collect the pure virtual methods for the base classes. 1081 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1082 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1083 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1084 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1085 if (BaseDecl && BaseDecl->isAbstract()) 1086 Collect(BaseDecl, Methods); 1087 } 1088 } 1089 1090 // Next, zero out any pure virtual methods that this class overrides. 1091 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1092 1093 MethodSetTy OverriddenMethods; 1094 size_t MethodsSize = Methods.size(); 1095 1096 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1097 i != e; ++i) { 1098 // Traverse the record, looking for methods. 1099 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1100 // If the method is pure virtual, add it to the methods vector. 1101 if (MD->isPure()) { 1102 Methods.push_back(MD); 1103 continue; 1104 } 1105 1106 // Otherwise, record all the overridden methods in our set. 1107 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1108 E = MD->end_overridden_methods(); I != E; ++I) { 1109 // Keep track of the overridden methods. 1110 OverriddenMethods.insert(*I); 1111 } 1112 } 1113 } 1114 1115 // Now go through the methods and zero out all the ones we know are 1116 // overridden. 1117 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1118 if (OverriddenMethods.count(Methods[i])) 1119 Methods[i] = 0; 1120 } 1121 1122 } 1123} 1124 1125bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1126 unsigned DiagID, AbstractDiagSelID SelID, 1127 const CXXRecordDecl *CurrentRD) { 1128 1129 if (!getLangOptions().CPlusPlus) 1130 return false; 1131 1132 if (const ArrayType *AT = Context.getAsArrayType(T)) 1133 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1134 CurrentRD); 1135 1136 if (const PointerType *PT = T->getAs<PointerType>()) { 1137 // Find the innermost pointer type. 1138 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1139 PT = T; 1140 1141 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1142 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1143 CurrentRD); 1144 } 1145 1146 const RecordType *RT = T->getAs<RecordType>(); 1147 if (!RT) 1148 return false; 1149 1150 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1151 if (!RD) 1152 return false; 1153 1154 if (CurrentRD && CurrentRD != RD) 1155 return false; 1156 1157 if (!RD->isAbstract()) 1158 return false; 1159 1160 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1161 1162 // Check if we've already emitted the list of pure virtual functions for this 1163 // class. 1164 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1165 return true; 1166 1167 PureVirtualMethodCollector Collector(Context, RD); 1168 1169 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1170 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1171 const CXXMethodDecl *MD = *I; 1172 1173 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1174 MD->getDeclName(); 1175 } 1176 1177 if (!PureVirtualClassDiagSet) 1178 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1179 PureVirtualClassDiagSet->insert(RD); 1180 1181 return true; 1182} 1183 1184namespace { 1185 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1186 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1187 Sema &SemaRef; 1188 CXXRecordDecl *AbstractClass; 1189 1190 bool VisitDeclContext(const DeclContext *DC) { 1191 bool Invalid = false; 1192 1193 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1194 E = DC->decls_end(); I != E; ++I) 1195 Invalid |= Visit(*I); 1196 1197 return Invalid; 1198 } 1199 1200 public: 1201 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1202 : SemaRef(SemaRef), AbstractClass(ac) { 1203 Visit(SemaRef.Context.getTranslationUnitDecl()); 1204 } 1205 1206 bool VisitFunctionDecl(const FunctionDecl *FD) { 1207 if (FD->isThisDeclarationADefinition()) { 1208 // No need to do the check if we're in a definition, because it requires 1209 // that the return/param types are complete. 1210 // because that requires 1211 return VisitDeclContext(FD); 1212 } 1213 1214 // Check the return type. 1215 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1216 bool Invalid = 1217 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1218 diag::err_abstract_type_in_decl, 1219 Sema::AbstractReturnType, 1220 AbstractClass); 1221 1222 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1223 E = FD->param_end(); I != E; ++I) { 1224 const ParmVarDecl *VD = *I; 1225 Invalid |= 1226 SemaRef.RequireNonAbstractType(VD->getLocation(), 1227 VD->getOriginalType(), 1228 diag::err_abstract_type_in_decl, 1229 Sema::AbstractParamType, 1230 AbstractClass); 1231 } 1232 1233 return Invalid; 1234 } 1235 1236 bool VisitDecl(const Decl* D) { 1237 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1238 return VisitDeclContext(DC); 1239 1240 return false; 1241 } 1242 }; 1243} 1244 1245void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1246 DeclPtrTy TagDecl, 1247 SourceLocation LBrac, 1248 SourceLocation RBrac) { 1249 if (!TagDecl) 1250 return; 1251 1252 AdjustDeclIfTemplate(TagDecl); 1253 ActOnFields(S, RLoc, TagDecl, 1254 (DeclPtrTy*)FieldCollector->getCurFields(), 1255 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1256 1257 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1258 if (!RD->isAbstract()) { 1259 // Collect all the pure virtual methods and see if this is an abstract 1260 // class after all. 1261 PureVirtualMethodCollector Collector(Context, RD); 1262 if (!Collector.empty()) 1263 RD->setAbstract(true); 1264 } 1265 1266 if (RD->isAbstract()) 1267 AbstractClassUsageDiagnoser(*this, RD); 1268 1269 if (!RD->isDependentType()) 1270 AddImplicitlyDeclaredMembersToClass(RD); 1271} 1272 1273/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1274/// special functions, such as the default constructor, copy 1275/// constructor, or destructor, to the given C++ class (C++ 1276/// [special]p1). This routine can only be executed just before the 1277/// definition of the class is complete. 1278void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1279 CanQualType ClassType 1280 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1281 1282 // FIXME: Implicit declarations have exception specifications, which are 1283 // the union of the specifications of the implicitly called functions. 1284 1285 if (!ClassDecl->hasUserDeclaredConstructor()) { 1286 // C++ [class.ctor]p5: 1287 // A default constructor for a class X is a constructor of class X 1288 // that can be called without an argument. If there is no 1289 // user-declared constructor for class X, a default constructor is 1290 // implicitly declared. An implicitly-declared default constructor 1291 // is an inline public member of its class. 1292 DeclarationName Name 1293 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1294 CXXConstructorDecl *DefaultCon = 1295 CXXConstructorDecl::Create(Context, ClassDecl, 1296 ClassDecl->getLocation(), Name, 1297 Context.getFunctionType(Context.VoidTy, 1298 0, 0, false, 0), 1299 /*isExplicit=*/false, 1300 /*isInline=*/true, 1301 /*isImplicitlyDeclared=*/true); 1302 DefaultCon->setAccess(AS_public); 1303 DefaultCon->setImplicit(); 1304 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1305 ClassDecl->addDecl(DefaultCon); 1306 } 1307 1308 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1309 // C++ [class.copy]p4: 1310 // If the class definition does not explicitly declare a copy 1311 // constructor, one is declared implicitly. 1312 1313 // C++ [class.copy]p5: 1314 // The implicitly-declared copy constructor for a class X will 1315 // have the form 1316 // 1317 // X::X(const X&) 1318 // 1319 // if 1320 bool HasConstCopyConstructor = true; 1321 1322 // -- each direct or virtual base class B of X has a copy 1323 // constructor whose first parameter is of type const B& or 1324 // const volatile B&, and 1325 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1326 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1327 const CXXRecordDecl *BaseClassDecl 1328 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1329 HasConstCopyConstructor 1330 = BaseClassDecl->hasConstCopyConstructor(Context); 1331 } 1332 1333 // -- for all the nonstatic data members of X that are of a 1334 // class type M (or array thereof), each such class type 1335 // has a copy constructor whose first parameter is of type 1336 // const M& or const volatile M&. 1337 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1338 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1339 ++Field) { 1340 QualType FieldType = (*Field)->getType(); 1341 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1342 FieldType = Array->getElementType(); 1343 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1344 const CXXRecordDecl *FieldClassDecl 1345 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1346 HasConstCopyConstructor 1347 = FieldClassDecl->hasConstCopyConstructor(Context); 1348 } 1349 } 1350 1351 // Otherwise, the implicitly declared copy constructor will have 1352 // the form 1353 // 1354 // X::X(X&) 1355 QualType ArgType = ClassType; 1356 if (HasConstCopyConstructor) 1357 ArgType = ArgType.withConst(); 1358 ArgType = Context.getLValueReferenceType(ArgType); 1359 1360 // An implicitly-declared copy constructor is an inline public 1361 // member of its class. 1362 DeclarationName Name 1363 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1364 CXXConstructorDecl *CopyConstructor 1365 = CXXConstructorDecl::Create(Context, ClassDecl, 1366 ClassDecl->getLocation(), Name, 1367 Context.getFunctionType(Context.VoidTy, 1368 &ArgType, 1, 1369 false, 0), 1370 /*isExplicit=*/false, 1371 /*isInline=*/true, 1372 /*isImplicitlyDeclared=*/true); 1373 CopyConstructor->setAccess(AS_public); 1374 CopyConstructor->setImplicit(); 1375 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1376 1377 // Add the parameter to the constructor. 1378 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1379 ClassDecl->getLocation(), 1380 /*IdentifierInfo=*/0, 1381 ArgType, VarDecl::None, 0); 1382 CopyConstructor->setParams(Context, &FromParam, 1); 1383 ClassDecl->addDecl(CopyConstructor); 1384 } 1385 1386 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1387 // Note: The following rules are largely analoguous to the copy 1388 // constructor rules. Note that virtual bases are not taken into account 1389 // for determining the argument type of the operator. Note also that 1390 // operators taking an object instead of a reference are allowed. 1391 // 1392 // C++ [class.copy]p10: 1393 // If the class definition does not explicitly declare a copy 1394 // assignment operator, one is declared implicitly. 1395 // The implicitly-defined copy assignment operator for a class X 1396 // will have the form 1397 // 1398 // X& X::operator=(const X&) 1399 // 1400 // if 1401 bool HasConstCopyAssignment = true; 1402 1403 // -- each direct base class B of X has a copy assignment operator 1404 // whose parameter is of type const B&, const volatile B& or B, 1405 // and 1406 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1407 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1408 const CXXRecordDecl *BaseClassDecl 1409 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1410 const CXXMethodDecl *MD = 0; 1411 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 1412 MD); 1413 } 1414 1415 // -- for all the nonstatic data members of X that are of a class 1416 // type M (or array thereof), each such class type has a copy 1417 // assignment operator whose parameter is of type const M&, 1418 // const volatile M& or M. 1419 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1420 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1421 ++Field) { 1422 QualType FieldType = (*Field)->getType(); 1423 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1424 FieldType = Array->getElementType(); 1425 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1426 const CXXRecordDecl *FieldClassDecl 1427 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1428 const CXXMethodDecl *MD = 0; 1429 HasConstCopyAssignment 1430 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 1431 } 1432 } 1433 1434 // Otherwise, the implicitly declared copy assignment operator will 1435 // have the form 1436 // 1437 // X& X::operator=(X&) 1438 QualType ArgType = ClassType; 1439 QualType RetType = Context.getLValueReferenceType(ArgType); 1440 if (HasConstCopyAssignment) 1441 ArgType = ArgType.withConst(); 1442 ArgType = Context.getLValueReferenceType(ArgType); 1443 1444 // An implicitly-declared copy assignment operator is an inline public 1445 // member of its class. 1446 DeclarationName Name = 1447 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1448 CXXMethodDecl *CopyAssignment = 1449 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1450 Context.getFunctionType(RetType, &ArgType, 1, 1451 false, 0), 1452 /*isStatic=*/false, /*isInline=*/true); 1453 CopyAssignment->setAccess(AS_public); 1454 CopyAssignment->setImplicit(); 1455 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1456 CopyAssignment->setCopyAssignment(true); 1457 1458 // Add the parameter to the operator. 1459 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1460 ClassDecl->getLocation(), 1461 /*IdentifierInfo=*/0, 1462 ArgType, VarDecl::None, 0); 1463 CopyAssignment->setParams(Context, &FromParam, 1); 1464 1465 // Don't call addedAssignmentOperator. There is no way to distinguish an 1466 // implicit from an explicit assignment operator. 1467 ClassDecl->addDecl(CopyAssignment); 1468 } 1469 1470 if (!ClassDecl->hasUserDeclaredDestructor()) { 1471 // C++ [class.dtor]p2: 1472 // If a class has no user-declared destructor, a destructor is 1473 // declared implicitly. An implicitly-declared destructor is an 1474 // inline public member of its class. 1475 DeclarationName Name 1476 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1477 CXXDestructorDecl *Destructor 1478 = CXXDestructorDecl::Create(Context, ClassDecl, 1479 ClassDecl->getLocation(), Name, 1480 Context.getFunctionType(Context.VoidTy, 1481 0, 0, false, 0), 1482 /*isInline=*/true, 1483 /*isImplicitlyDeclared=*/true); 1484 Destructor->setAccess(AS_public); 1485 Destructor->setImplicit(); 1486 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1487 ClassDecl->addDecl(Destructor); 1488 } 1489} 1490 1491void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1492 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1493 if (!Template) 1494 return; 1495 1496 TemplateParameterList *Params = Template->getTemplateParameters(); 1497 for (TemplateParameterList::iterator Param = Params->begin(), 1498 ParamEnd = Params->end(); 1499 Param != ParamEnd; ++Param) { 1500 NamedDecl *Named = cast<NamedDecl>(*Param); 1501 if (Named->getDeclName()) { 1502 S->AddDecl(DeclPtrTy::make(Named)); 1503 IdResolver.AddDecl(Named); 1504 } 1505 } 1506} 1507 1508/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1509/// parsing a top-level (non-nested) C++ class, and we are now 1510/// parsing those parts of the given Method declaration that could 1511/// not be parsed earlier (C++ [class.mem]p2), such as default 1512/// arguments. This action should enter the scope of the given 1513/// Method declaration as if we had just parsed the qualified method 1514/// name. However, it should not bring the parameters into scope; 1515/// that will be performed by ActOnDelayedCXXMethodParameter. 1516void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1517 if (!MethodD) 1518 return; 1519 1520 CXXScopeSpec SS; 1521 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1522 QualType ClassTy 1523 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1524 SS.setScopeRep( 1525 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1526 ActOnCXXEnterDeclaratorScope(S, SS); 1527} 1528 1529/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1530/// C++ method declaration. We're (re-)introducing the given 1531/// function parameter into scope for use in parsing later parts of 1532/// the method declaration. For example, we could see an 1533/// ActOnParamDefaultArgument event for this parameter. 1534void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1535 if (!ParamD) 1536 return; 1537 1538 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1539 1540 // If this parameter has an unparsed default argument, clear it out 1541 // to make way for the parsed default argument. 1542 if (Param->hasUnparsedDefaultArg()) 1543 Param->setDefaultArg(0); 1544 1545 S->AddDecl(DeclPtrTy::make(Param)); 1546 if (Param->getDeclName()) 1547 IdResolver.AddDecl(Param); 1548} 1549 1550/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1551/// processing the delayed method declaration for Method. The method 1552/// declaration is now considered finished. There may be a separate 1553/// ActOnStartOfFunctionDef action later (not necessarily 1554/// immediately!) for this method, if it was also defined inside the 1555/// class body. 1556void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1557 if (!MethodD) 1558 return; 1559 1560 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1561 CXXScopeSpec SS; 1562 QualType ClassTy 1563 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1564 SS.setScopeRep( 1565 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1566 ActOnCXXExitDeclaratorScope(S, SS); 1567 1568 // Now that we have our default arguments, check the constructor 1569 // again. It could produce additional diagnostics or affect whether 1570 // the class has implicitly-declared destructors, among other 1571 // things. 1572 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1573 CheckConstructor(Constructor); 1574 1575 // Check the default arguments, which we may have added. 1576 if (!Method->isInvalidDecl()) 1577 CheckCXXDefaultArguments(Method); 1578} 1579 1580/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1581/// the well-formedness of the constructor declarator @p D with type @p 1582/// R. If there are any errors in the declarator, this routine will 1583/// emit diagnostics and set the invalid bit to true. In any case, the type 1584/// will be updated to reflect a well-formed type for the constructor and 1585/// returned. 1586QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1587 FunctionDecl::StorageClass &SC) { 1588 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1589 1590 // C++ [class.ctor]p3: 1591 // A constructor shall not be virtual (10.3) or static (9.4). A 1592 // constructor can be invoked for a const, volatile or const 1593 // volatile object. A constructor shall not be declared const, 1594 // volatile, or const volatile (9.3.2). 1595 if (isVirtual) { 1596 if (!D.isInvalidType()) 1597 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1598 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1599 << SourceRange(D.getIdentifierLoc()); 1600 D.setInvalidType(); 1601 } 1602 if (SC == FunctionDecl::Static) { 1603 if (!D.isInvalidType()) 1604 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1605 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1606 << SourceRange(D.getIdentifierLoc()); 1607 D.setInvalidType(); 1608 SC = FunctionDecl::None; 1609 } 1610 1611 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1612 if (FTI.TypeQuals != 0) { 1613 if (FTI.TypeQuals & QualType::Const) 1614 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1615 << "const" << SourceRange(D.getIdentifierLoc()); 1616 if (FTI.TypeQuals & QualType::Volatile) 1617 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1618 << "volatile" << SourceRange(D.getIdentifierLoc()); 1619 if (FTI.TypeQuals & QualType::Restrict) 1620 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1621 << "restrict" << SourceRange(D.getIdentifierLoc()); 1622 } 1623 1624 // Rebuild the function type "R" without any type qualifiers (in 1625 // case any of the errors above fired) and with "void" as the 1626 // return type, since constructors don't have return types. We 1627 // *always* have to do this, because GetTypeForDeclarator will 1628 // put in a result type of "int" when none was specified. 1629 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1630 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1631 Proto->getNumArgs(), 1632 Proto->isVariadic(), 0); 1633} 1634 1635/// CheckConstructor - Checks a fully-formed constructor for 1636/// well-formedness, issuing any diagnostics required. Returns true if 1637/// the constructor declarator is invalid. 1638void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1639 CXXRecordDecl *ClassDecl 1640 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1641 if (!ClassDecl) 1642 return Constructor->setInvalidDecl(); 1643 1644 // C++ [class.copy]p3: 1645 // A declaration of a constructor for a class X is ill-formed if 1646 // its first parameter is of type (optionally cv-qualified) X and 1647 // either there are no other parameters or else all other 1648 // parameters have default arguments. 1649 if (!Constructor->isInvalidDecl() && 1650 ((Constructor->getNumParams() == 1) || 1651 (Constructor->getNumParams() > 1 && 1652 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1653 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1654 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1655 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1656 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1657 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1658 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1659 Constructor->setInvalidDecl(); 1660 } 1661 } 1662 1663 // Notify the class that we've added a constructor. 1664 ClassDecl->addedConstructor(Context, Constructor); 1665} 1666 1667static inline bool 1668FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1669 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1670 FTI.ArgInfo[0].Param && 1671 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1672} 1673 1674/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1675/// the well-formednes of the destructor declarator @p D with type @p 1676/// R. If there are any errors in the declarator, this routine will 1677/// emit diagnostics and set the declarator to invalid. Even if this happens, 1678/// will be updated to reflect a well-formed type for the destructor and 1679/// returned. 1680QualType Sema::CheckDestructorDeclarator(Declarator &D, 1681 FunctionDecl::StorageClass& SC) { 1682 // C++ [class.dtor]p1: 1683 // [...] A typedef-name that names a class is a class-name 1684 // (7.1.3); however, a typedef-name that names a class shall not 1685 // be used as the identifier in the declarator for a destructor 1686 // declaration. 1687 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1688 if (isa<TypedefType>(DeclaratorType)) { 1689 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1690 << DeclaratorType; 1691 D.setInvalidType(); 1692 } 1693 1694 // C++ [class.dtor]p2: 1695 // A destructor is used to destroy objects of its class type. A 1696 // destructor takes no parameters, and no return type can be 1697 // specified for it (not even void). The address of a destructor 1698 // shall not be taken. A destructor shall not be static. A 1699 // destructor can be invoked for a const, volatile or const 1700 // volatile object. A destructor shall not be declared const, 1701 // volatile or const volatile (9.3.2). 1702 if (SC == FunctionDecl::Static) { 1703 if (!D.isInvalidType()) 1704 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1705 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1706 << SourceRange(D.getIdentifierLoc()); 1707 SC = FunctionDecl::None; 1708 D.setInvalidType(); 1709 } 1710 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1711 // Destructors don't have return types, but the parser will 1712 // happily parse something like: 1713 // 1714 // class X { 1715 // float ~X(); 1716 // }; 1717 // 1718 // The return type will be eliminated later. 1719 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1720 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1721 << SourceRange(D.getIdentifierLoc()); 1722 } 1723 1724 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1725 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1726 if (FTI.TypeQuals & QualType::Const) 1727 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1728 << "const" << SourceRange(D.getIdentifierLoc()); 1729 if (FTI.TypeQuals & QualType::Volatile) 1730 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1731 << "volatile" << SourceRange(D.getIdentifierLoc()); 1732 if (FTI.TypeQuals & QualType::Restrict) 1733 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1734 << "restrict" << SourceRange(D.getIdentifierLoc()); 1735 D.setInvalidType(); 1736 } 1737 1738 // Make sure we don't have any parameters. 1739 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1740 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1741 1742 // Delete the parameters. 1743 FTI.freeArgs(); 1744 D.setInvalidType(); 1745 } 1746 1747 // Make sure the destructor isn't variadic. 1748 if (FTI.isVariadic) { 1749 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1750 D.setInvalidType(); 1751 } 1752 1753 // Rebuild the function type "R" without any type qualifiers or 1754 // parameters (in case any of the errors above fired) and with 1755 // "void" as the return type, since destructors don't have return 1756 // types. We *always* have to do this, because GetTypeForDeclarator 1757 // will put in a result type of "int" when none was specified. 1758 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1759} 1760 1761/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1762/// well-formednes of the conversion function declarator @p D with 1763/// type @p R. If there are any errors in the declarator, this routine 1764/// will emit diagnostics and return true. Otherwise, it will return 1765/// false. Either way, the type @p R will be updated to reflect a 1766/// well-formed type for the conversion operator. 1767void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1768 FunctionDecl::StorageClass& SC) { 1769 // C++ [class.conv.fct]p1: 1770 // Neither parameter types nor return type can be specified. The 1771 // type of a conversion function (8.3.5) is "function taking no 1772 // parameter returning conversion-type-id." 1773 if (SC == FunctionDecl::Static) { 1774 if (!D.isInvalidType()) 1775 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1776 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1777 << SourceRange(D.getIdentifierLoc()); 1778 D.setInvalidType(); 1779 SC = FunctionDecl::None; 1780 } 1781 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1782 // Conversion functions don't have return types, but the parser will 1783 // happily parse something like: 1784 // 1785 // class X { 1786 // float operator bool(); 1787 // }; 1788 // 1789 // The return type will be changed later anyway. 1790 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1791 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1792 << SourceRange(D.getIdentifierLoc()); 1793 } 1794 1795 // Make sure we don't have any parameters. 1796 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1797 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1798 1799 // Delete the parameters. 1800 D.getTypeObject(0).Fun.freeArgs(); 1801 D.setInvalidType(); 1802 } 1803 1804 // Make sure the conversion function isn't variadic. 1805 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1806 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1807 D.setInvalidType(); 1808 } 1809 1810 // C++ [class.conv.fct]p4: 1811 // The conversion-type-id shall not represent a function type nor 1812 // an array type. 1813 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1814 if (ConvType->isArrayType()) { 1815 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1816 ConvType = Context.getPointerType(ConvType); 1817 D.setInvalidType(); 1818 } else if (ConvType->isFunctionType()) { 1819 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1820 ConvType = Context.getPointerType(ConvType); 1821 D.setInvalidType(); 1822 } 1823 1824 // Rebuild the function type "R" without any parameters (in case any 1825 // of the errors above fired) and with the conversion type as the 1826 // return type. 1827 R = Context.getFunctionType(ConvType, 0, 0, false, 1828 R->getAsFunctionProtoType()->getTypeQuals()); 1829 1830 // C++0x explicit conversion operators. 1831 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1832 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1833 diag::warn_explicit_conversion_functions) 1834 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1835} 1836 1837/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1838/// the declaration of the given C++ conversion function. This routine 1839/// is responsible for recording the conversion function in the C++ 1840/// class, if possible. 1841Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1842 assert(Conversion && "Expected to receive a conversion function declaration"); 1843 1844 // Set the lexical context of this conversion function 1845 Conversion->setLexicalDeclContext(CurContext); 1846 1847 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1848 1849 // Make sure we aren't redeclaring the conversion function. 1850 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1851 1852 // C++ [class.conv.fct]p1: 1853 // [...] A conversion function is never used to convert a 1854 // (possibly cv-qualified) object to the (possibly cv-qualified) 1855 // same object type (or a reference to it), to a (possibly 1856 // cv-qualified) base class of that type (or a reference to it), 1857 // or to (possibly cv-qualified) void. 1858 // FIXME: Suppress this warning if the conversion function ends up being a 1859 // virtual function that overrides a virtual function in a base class. 1860 QualType ClassType 1861 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1862 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1863 ConvType = ConvTypeRef->getPointeeType(); 1864 if (ConvType->isRecordType()) { 1865 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1866 if (ConvType == ClassType) 1867 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1868 << ClassType; 1869 else if (IsDerivedFrom(ClassType, ConvType)) 1870 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1871 << ClassType << ConvType; 1872 } else if (ConvType->isVoidType()) { 1873 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1874 << ClassType << ConvType; 1875 } 1876 1877 if (Conversion->getPreviousDeclaration()) { 1878 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1879 for (OverloadedFunctionDecl::function_iterator 1880 Conv = Conversions->function_begin(), 1881 ConvEnd = Conversions->function_end(); 1882 Conv != ConvEnd; ++Conv) { 1883 if (*Conv 1884 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1885 *Conv = Conversion; 1886 return DeclPtrTy::make(Conversion); 1887 } 1888 } 1889 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1890 } else 1891 ClassDecl->addConversionFunction(Context, Conversion); 1892 1893 return DeclPtrTy::make(Conversion); 1894} 1895 1896//===----------------------------------------------------------------------===// 1897// Namespace Handling 1898//===----------------------------------------------------------------------===// 1899 1900/// ActOnStartNamespaceDef - This is called at the start of a namespace 1901/// definition. 1902Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1903 SourceLocation IdentLoc, 1904 IdentifierInfo *II, 1905 SourceLocation LBrace) { 1906 NamespaceDecl *Namespc = 1907 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1908 Namespc->setLBracLoc(LBrace); 1909 1910 Scope *DeclRegionScope = NamespcScope->getParent(); 1911 1912 if (II) { 1913 // C++ [namespace.def]p2: 1914 // The identifier in an original-namespace-definition shall not have been 1915 // previously defined in the declarative region in which the 1916 // original-namespace-definition appears. The identifier in an 1917 // original-namespace-definition is the name of the namespace. Subsequently 1918 // in that declarative region, it is treated as an original-namespace-name. 1919 1920 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1921 true); 1922 1923 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1924 // This is an extended namespace definition. 1925 // Attach this namespace decl to the chain of extended namespace 1926 // definitions. 1927 OrigNS->setNextNamespace(Namespc); 1928 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1929 1930 // Remove the previous declaration from the scope. 1931 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1932 IdResolver.RemoveDecl(OrigNS); 1933 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1934 } 1935 } else if (PrevDecl) { 1936 // This is an invalid name redefinition. 1937 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1938 << Namespc->getDeclName(); 1939 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1940 Namespc->setInvalidDecl(); 1941 // Continue on to push Namespc as current DeclContext and return it. 1942 } 1943 1944 PushOnScopeChains(Namespc, DeclRegionScope); 1945 } else { 1946 // FIXME: Handle anonymous namespaces 1947 } 1948 1949 // Although we could have an invalid decl (i.e. the namespace name is a 1950 // redefinition), push it as current DeclContext and try to continue parsing. 1951 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1952 // for the namespace has the declarations that showed up in that particular 1953 // namespace definition. 1954 PushDeclContext(NamespcScope, Namespc); 1955 return DeclPtrTy::make(Namespc); 1956} 1957 1958/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1959/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1960void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1961 Decl *Dcl = D.getAs<Decl>(); 1962 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1963 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1964 Namespc->setRBracLoc(RBrace); 1965 PopDeclContext(); 1966} 1967 1968Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1969 SourceLocation UsingLoc, 1970 SourceLocation NamespcLoc, 1971 const CXXScopeSpec &SS, 1972 SourceLocation IdentLoc, 1973 IdentifierInfo *NamespcName, 1974 AttributeList *AttrList) { 1975 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1976 assert(NamespcName && "Invalid NamespcName."); 1977 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1978 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1979 1980 UsingDirectiveDecl *UDir = 0; 1981 1982 // Lookup namespace name. 1983 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1984 LookupNamespaceName, false); 1985 if (R.isAmbiguous()) { 1986 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1987 return DeclPtrTy(); 1988 } 1989 if (NamedDecl *NS = R) { 1990 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1991 // C++ [namespace.udir]p1: 1992 // A using-directive specifies that the names in the nominated 1993 // namespace can be used in the scope in which the 1994 // using-directive appears after the using-directive. During 1995 // unqualified name lookup (3.4.1), the names appear as if they 1996 // were declared in the nearest enclosing namespace which 1997 // contains both the using-directive and the nominated 1998 // namespace. [Note: in this context, "contains" means "contains 1999 // directly or indirectly". ] 2000 2001 // Find enclosing context containing both using-directive and 2002 // nominated namespace. 2003 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2004 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2005 CommonAncestor = CommonAncestor->getParent(); 2006 2007 UDir = UsingDirectiveDecl::Create(Context, 2008 CurContext, UsingLoc, 2009 NamespcLoc, 2010 SS.getRange(), 2011 (NestedNameSpecifier *)SS.getScopeRep(), 2012 IdentLoc, 2013 cast<NamespaceDecl>(NS), 2014 CommonAncestor); 2015 PushUsingDirective(S, UDir); 2016 } else { 2017 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2018 } 2019 2020 // FIXME: We ignore attributes for now. 2021 delete AttrList; 2022 return DeclPtrTy::make(UDir); 2023} 2024 2025void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2026 // If scope has associated entity, then using directive is at namespace 2027 // or translation unit scope. We add UsingDirectiveDecls, into 2028 // it's lookup structure. 2029 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2030 Ctx->addDecl(UDir); 2031 else 2032 // Otherwise it is block-sope. using-directives will affect lookup 2033 // only to the end of scope. 2034 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2035} 2036 2037 2038Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2039 SourceLocation UsingLoc, 2040 const CXXScopeSpec &SS, 2041 SourceLocation IdentLoc, 2042 IdentifierInfo *TargetName, 2043 OverloadedOperatorKind Op, 2044 AttributeList *AttrList, 2045 bool IsTypeName) { 2046 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2047 assert((TargetName || Op) && "Invalid TargetName."); 2048 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2049 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2050 2051 UsingDecl *UsingAlias = 0; 2052 2053 DeclarationName Name; 2054 if (TargetName) 2055 Name = TargetName; 2056 else 2057 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2058 2059 // Lookup target name. 2060 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2061 2062 if (NamedDecl *NS = R) { 2063 if (IsTypeName && !isa<TypeDecl>(NS)) { 2064 Diag(IdentLoc, diag::err_using_typename_non_type); 2065 } 2066 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2067 NS->getLocation(), UsingLoc, NS, 2068 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2069 IsTypeName); 2070 PushOnScopeChains(UsingAlias, S); 2071 } else { 2072 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2073 } 2074 2075 // FIXME: We ignore attributes for now. 2076 delete AttrList; 2077 return DeclPtrTy::make(UsingAlias); 2078} 2079 2080/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2081/// is a namespace alias, returns the namespace it points to. 2082static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2083 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2084 return AD->getNamespace(); 2085 return dyn_cast_or_null<NamespaceDecl>(D); 2086} 2087 2088Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2089 SourceLocation NamespaceLoc, 2090 SourceLocation AliasLoc, 2091 IdentifierInfo *Alias, 2092 const CXXScopeSpec &SS, 2093 SourceLocation IdentLoc, 2094 IdentifierInfo *Ident) { 2095 2096 // Lookup the namespace name. 2097 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2098 2099 // Check if we have a previous declaration with the same name. 2100 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2101 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2102 // We already have an alias with the same name that points to the same 2103 // namespace, so don't create a new one. 2104 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2105 return DeclPtrTy(); 2106 } 2107 2108 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2109 diag::err_redefinition_different_kind; 2110 Diag(AliasLoc, DiagID) << Alias; 2111 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2112 return DeclPtrTy(); 2113 } 2114 2115 if (R.isAmbiguous()) { 2116 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2117 return DeclPtrTy(); 2118 } 2119 2120 if (!R) { 2121 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2122 return DeclPtrTy(); 2123 } 2124 2125 NamespaceAliasDecl *AliasDecl = 2126 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2127 Alias, SS.getRange(), 2128 (NestedNameSpecifier *)SS.getScopeRep(), 2129 IdentLoc, R); 2130 2131 CurContext->addDecl(AliasDecl); 2132 return DeclPtrTy::make(AliasDecl); 2133} 2134 2135void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2136 CXXConstructorDecl *Constructor) { 2137 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2138 !Constructor->isUsed()) && 2139 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2140 2141 CXXRecordDecl *ClassDecl 2142 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2143 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2144 // Before the implicitly-declared default constructor for a class is 2145 // implicitly defined, all the implicitly-declared default constructors 2146 // for its base class and its non-static data members shall have been 2147 // implicitly defined. 2148 bool err = false; 2149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2150 E = ClassDecl->bases_end(); Base != E; ++Base) { 2151 CXXRecordDecl *BaseClassDecl 2152 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2153 if (!BaseClassDecl->hasTrivialConstructor()) { 2154 if (CXXConstructorDecl *BaseCtor = 2155 BaseClassDecl->getDefaultConstructor(Context)) 2156 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2157 else { 2158 Diag(CurrentLocation, diag::err_defining_default_ctor) 2159 << Context.getTagDeclType(ClassDecl) << 1 2160 << Context.getTagDeclType(BaseClassDecl); 2161 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2162 << Context.getTagDeclType(BaseClassDecl); 2163 err = true; 2164 } 2165 } 2166 } 2167 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2168 E = ClassDecl->field_end(); Field != E; ++Field) { 2169 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2170 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2171 FieldType = Array->getElementType(); 2172 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2173 CXXRecordDecl *FieldClassDecl 2174 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2175 if (!FieldClassDecl->hasTrivialConstructor()) { 2176 if (CXXConstructorDecl *FieldCtor = 2177 FieldClassDecl->getDefaultConstructor(Context)) 2178 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2179 else { 2180 Diag(CurrentLocation, diag::err_defining_default_ctor) 2181 << Context.getTagDeclType(ClassDecl) << 0 << 2182 Context.getTagDeclType(FieldClassDecl); 2183 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2184 << Context.getTagDeclType(FieldClassDecl); 2185 err = true; 2186 } 2187 } 2188 } else if (FieldType->isReferenceType()) { 2189 Diag(CurrentLocation, diag::err_unintialized_member) 2190 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2191 Diag((*Field)->getLocation(), diag::note_declared_at); 2192 err = true; 2193 } else if (FieldType.isConstQualified()) { 2194 Diag(CurrentLocation, diag::err_unintialized_member) 2195 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2196 Diag((*Field)->getLocation(), diag::note_declared_at); 2197 err = true; 2198 } 2199 } 2200 if (!err) 2201 Constructor->setUsed(); 2202 else 2203 Constructor->setInvalidDecl(); 2204} 2205 2206void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2207 CXXDestructorDecl *Destructor) { 2208 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2209 "DefineImplicitDestructor - call it for implicit default dtor"); 2210 2211 CXXRecordDecl *ClassDecl 2212 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2213 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2214 // C++ [class.dtor] p5 2215 // Before the implicitly-declared default destructor for a class is 2216 // implicitly defined, all the implicitly-declared default destructors 2217 // for its base class and its non-static data members shall have been 2218 // implicitly defined. 2219 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2220 E = ClassDecl->bases_end(); Base != E; ++Base) { 2221 CXXRecordDecl *BaseClassDecl 2222 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2223 if (!BaseClassDecl->hasTrivialDestructor()) { 2224 if (CXXDestructorDecl *BaseDtor = 2225 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2226 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2227 else 2228 assert(false && 2229 "DefineImplicitDestructor - missing dtor in a base class"); 2230 } 2231 } 2232 2233 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2234 E = ClassDecl->field_end(); Field != E; ++Field) { 2235 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2236 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2237 FieldType = Array->getElementType(); 2238 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2239 CXXRecordDecl *FieldClassDecl 2240 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2241 if (!FieldClassDecl->hasTrivialDestructor()) { 2242 if (CXXDestructorDecl *FieldDtor = 2243 const_cast<CXXDestructorDecl*>( 2244 FieldClassDecl->getDestructor(Context))) 2245 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2246 else 2247 assert(false && 2248 "DefineImplicitDestructor - missing dtor in class of a data member"); 2249 } 2250 } 2251 } 2252 Destructor->setUsed(); 2253} 2254 2255void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2256 CXXMethodDecl *MethodDecl) { 2257 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2258 MethodDecl->getOverloadedOperator() == OO_Equal && 2259 !MethodDecl->isUsed()) && 2260 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2261 2262 CXXRecordDecl *ClassDecl 2263 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2264 2265 // C++[class.copy] p12 2266 // Before the implicitly-declared copy assignment operator for a class is 2267 // implicitly defined, all implicitly-declared copy assignment operators 2268 // for its direct base classes and its nonstatic data members shall have 2269 // been implicitly defined. 2270 bool err = false; 2271 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2272 E = ClassDecl->bases_end(); Base != E; ++Base) { 2273 CXXRecordDecl *BaseClassDecl 2274 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2275 if (CXXMethodDecl *BaseAssignOpMethod = 2276 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2277 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2278 } 2279 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2280 E = ClassDecl->field_end(); Field != E; ++Field) { 2281 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2282 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2283 FieldType = Array->getElementType(); 2284 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2285 CXXRecordDecl *FieldClassDecl 2286 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2287 if (CXXMethodDecl *FieldAssignOpMethod = 2288 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2289 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2290 } else if (FieldType->isReferenceType()) { 2291 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2292 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2293 Diag(Field->getLocation(), diag::note_declared_at); 2294 Diag(CurrentLocation, diag::note_first_required_here); 2295 err = true; 2296 } else if (FieldType.isConstQualified()) { 2297 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2298 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2299 Diag(Field->getLocation(), diag::note_declared_at); 2300 Diag(CurrentLocation, diag::note_first_required_here); 2301 err = true; 2302 } 2303 } 2304 if (!err) 2305 MethodDecl->setUsed(); 2306} 2307 2308CXXMethodDecl * 2309Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2310 CXXRecordDecl *ClassDecl) { 2311 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2312 QualType RHSType(LHSType); 2313 // If class's assignment operator argument is const/volatile qualified, 2314 // look for operator = (const/volatile B&). Otherwise, look for 2315 // operator = (B&). 2316 if (ParmDecl->getType().isConstQualified()) 2317 RHSType.addConst(); 2318 if (ParmDecl->getType().isVolatileQualified()) 2319 RHSType.addVolatile(); 2320 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2321 LHSType, 2322 SourceLocation())); 2323 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2324 RHSType, 2325 SourceLocation())); 2326 Expr *Args[2] = { &*LHS, &*RHS }; 2327 OverloadCandidateSet CandidateSet; 2328 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2329 CandidateSet); 2330 OverloadCandidateSet::iterator Best; 2331 if (BestViableFunction(CandidateSet, 2332 ClassDecl->getLocation(), Best) == OR_Success) 2333 return cast<CXXMethodDecl>(Best->Function); 2334 assert(false && 2335 "getAssignOperatorMethod - copy assignment operator method not found"); 2336 return 0; 2337} 2338 2339void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2340 CXXConstructorDecl *CopyConstructor, 2341 unsigned TypeQuals) { 2342 assert((CopyConstructor->isImplicit() && 2343 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2344 !CopyConstructor->isUsed()) && 2345 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2346 2347 CXXRecordDecl *ClassDecl 2348 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2349 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2350 // C++ [class.copy] p209 2351 // Before the implicitly-declared copy constructor for a class is 2352 // implicitly defined, all the implicitly-declared copy constructors 2353 // for its base class and its non-static data members shall have been 2354 // implicitly defined. 2355 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2356 Base != ClassDecl->bases_end(); ++Base) { 2357 CXXRecordDecl *BaseClassDecl 2358 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2359 if (CXXConstructorDecl *BaseCopyCtor = 2360 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2361 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2362 } 2363 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2364 FieldEnd = ClassDecl->field_end(); 2365 Field != FieldEnd; ++Field) { 2366 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2367 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2368 FieldType = Array->getElementType(); 2369 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2370 CXXRecordDecl *FieldClassDecl 2371 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2372 if (CXXConstructorDecl *FieldCopyCtor = 2373 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2374 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2375 } 2376 } 2377 CopyConstructor->setUsed(); 2378} 2379 2380Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2381 CXXConstructorDecl *Constructor, 2382 Expr **Exprs, unsigned NumExprs) { 2383 bool Elidable = false; 2384 2385 // [class.copy]p15: 2386 // Whenever a temporary class object is copied using a copy constructor, and 2387 // this object and the copy have the same cv-unqualified type, an 2388 // implementation is permitted to treat the original and the copy as two 2389 // different ways of referring to the same object and not perform a copy at 2390 //all, even if the class copy constructor or destructor have side effects. 2391 2392 // FIXME: Is this enough? 2393 if (Constructor->isCopyConstructor(Context) && NumExprs == 1) { 2394 Expr *E = Exprs[0]; 2395 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 2396 E = BE->getSubExpr(); 2397 2398 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 2399 Elidable = true; 2400 } 2401 2402 return BuildCXXConstructExpr(DeclInitType, Constructor, Elidable, 2403 Exprs, NumExprs); 2404} 2405 2406/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2407/// including handling of its default argument expressions. 2408Expr *Sema::BuildCXXConstructExpr(QualType DeclInitType, 2409 CXXConstructorDecl *Constructor, 2410 bool Elidable, 2411 Expr **Exprs, unsigned NumExprs) { 2412 CXXConstructExpr *Temp = CXXConstructExpr::Create(Context, DeclInitType, 2413 Constructor, 2414 Elidable, Exprs, NumExprs); 2415 // default arguments must be added to constructor call expression. 2416 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2417 unsigned NumArgsInProto = FDecl->param_size(); 2418 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2419 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2420 2421 // If the default expression creates temporaries, we need to 2422 // push them to the current stack of expression temporaries so they'll 2423 // be properly destroyed. 2424 if (CXXExprWithTemporaries *E 2425 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2426 assert(!E->shouldDestroyTemporaries() && 2427 "Can't destroy temporaries in a default argument expr!"); 2428 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2429 ExprTemporaries.push_back(E->getTemporary(I)); 2430 } 2431 Expr *Arg = CXXDefaultArgExpr::Create(Context, FDecl->getParamDecl(j)); 2432 Temp->setArg(j, Arg); 2433 } 2434 return Temp; 2435} 2436 2437void Sema::InitializeVarWithConstructor(VarDecl *VD, 2438 CXXConstructorDecl *Constructor, 2439 QualType DeclInitType, 2440 Expr **Exprs, unsigned NumExprs) { 2441 Expr *Temp = BuildCXXConstructExpr(DeclInitType, Constructor, 2442 Exprs, NumExprs); 2443 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2444 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2445 VD->setInit(Context, Temp); 2446} 2447 2448void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2449{ 2450 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2451 DeclInitType->getAs<RecordType>()->getDecl()); 2452 if (!ClassDecl->hasTrivialDestructor()) 2453 if (CXXDestructorDecl *Destructor = 2454 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2455 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2456} 2457 2458/// AddCXXDirectInitializerToDecl - This action is called immediately after 2459/// ActOnDeclarator, when a C++ direct initializer is present. 2460/// e.g: "int x(1);" 2461void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2462 SourceLocation LParenLoc, 2463 MultiExprArg Exprs, 2464 SourceLocation *CommaLocs, 2465 SourceLocation RParenLoc) { 2466 unsigned NumExprs = Exprs.size(); 2467 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2468 Decl *RealDecl = Dcl.getAs<Decl>(); 2469 2470 // If there is no declaration, there was an error parsing it. Just ignore 2471 // the initializer. 2472 if (RealDecl == 0) 2473 return; 2474 2475 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2476 if (!VDecl) { 2477 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2478 RealDecl->setInvalidDecl(); 2479 return; 2480 } 2481 2482 // FIXME: Need to handle dependent types and expressions here. 2483 2484 // We will treat direct-initialization as a copy-initialization: 2485 // int x(1); -as-> int x = 1; 2486 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2487 // 2488 // Clients that want to distinguish between the two forms, can check for 2489 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2490 // A major benefit is that clients that don't particularly care about which 2491 // exactly form was it (like the CodeGen) can handle both cases without 2492 // special case code. 2493 2494 // C++ 8.5p11: 2495 // The form of initialization (using parentheses or '=') is generally 2496 // insignificant, but does matter when the entity being initialized has a 2497 // class type. 2498 QualType DeclInitType = VDecl->getType(); 2499 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2500 DeclInitType = Array->getElementType(); 2501 2502 // FIXME: This isn't the right place to complete the type. 2503 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2504 diag::err_typecheck_decl_incomplete_type)) { 2505 VDecl->setInvalidDecl(); 2506 return; 2507 } 2508 2509 if (VDecl->getType()->isRecordType()) { 2510 CXXConstructorDecl *Constructor 2511 = PerformInitializationByConstructor(DeclInitType, 2512 (Expr **)Exprs.get(), NumExprs, 2513 VDecl->getLocation(), 2514 SourceRange(VDecl->getLocation(), 2515 RParenLoc), 2516 VDecl->getDeclName(), 2517 IK_Direct); 2518 if (!Constructor) 2519 RealDecl->setInvalidDecl(); 2520 else { 2521 VDecl->setCXXDirectInitializer(true); 2522 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2523 (Expr**)Exprs.release(), NumExprs); 2524 FinalizeVarWithDestructor(VDecl, DeclInitType); 2525 } 2526 return; 2527 } 2528 2529 if (NumExprs > 1) { 2530 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2531 << SourceRange(VDecl->getLocation(), RParenLoc); 2532 RealDecl->setInvalidDecl(); 2533 return; 2534 } 2535 2536 // Let clients know that initialization was done with a direct initializer. 2537 VDecl->setCXXDirectInitializer(true); 2538 2539 assert(NumExprs == 1 && "Expected 1 expression"); 2540 // Set the init expression, handles conversions. 2541 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2542 /*DirectInit=*/true); 2543} 2544 2545/// PerformInitializationByConstructor - Perform initialization by 2546/// constructor (C++ [dcl.init]p14), which may occur as part of 2547/// direct-initialization or copy-initialization. We are initializing 2548/// an object of type @p ClassType with the given arguments @p 2549/// Args. @p Loc is the location in the source code where the 2550/// initializer occurs (e.g., a declaration, member initializer, 2551/// functional cast, etc.) while @p Range covers the whole 2552/// initialization. @p InitEntity is the entity being initialized, 2553/// which may by the name of a declaration or a type. @p Kind is the 2554/// kind of initialization we're performing, which affects whether 2555/// explicit constructors will be considered. When successful, returns 2556/// the constructor that will be used to perform the initialization; 2557/// when the initialization fails, emits a diagnostic and returns 2558/// null. 2559CXXConstructorDecl * 2560Sema::PerformInitializationByConstructor(QualType ClassType, 2561 Expr **Args, unsigned NumArgs, 2562 SourceLocation Loc, SourceRange Range, 2563 DeclarationName InitEntity, 2564 InitializationKind Kind) { 2565 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2566 assert(ClassRec && "Can only initialize a class type here"); 2567 2568 // C++ [dcl.init]p14: 2569 // 2570 // If the initialization is direct-initialization, or if it is 2571 // copy-initialization where the cv-unqualified version of the 2572 // source type is the same class as, or a derived class of, the 2573 // class of the destination, constructors are considered. The 2574 // applicable constructors are enumerated (13.3.1.3), and the 2575 // best one is chosen through overload resolution (13.3). The 2576 // constructor so selected is called to initialize the object, 2577 // with the initializer expression(s) as its argument(s). If no 2578 // constructor applies, or the overload resolution is ambiguous, 2579 // the initialization is ill-formed. 2580 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2581 OverloadCandidateSet CandidateSet; 2582 2583 // Add constructors to the overload set. 2584 DeclarationName ConstructorName 2585 = Context.DeclarationNames.getCXXConstructorName( 2586 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2587 DeclContext::lookup_const_iterator Con, ConEnd; 2588 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2589 Con != ConEnd; ++Con) { 2590 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2591 if ((Kind == IK_Direct) || 2592 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2593 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2594 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2595 } 2596 2597 // FIXME: When we decide not to synthesize the implicitly-declared 2598 // constructors, we'll need to make them appear here. 2599 2600 OverloadCandidateSet::iterator Best; 2601 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2602 case OR_Success: 2603 // We found a constructor. Return it. 2604 return cast<CXXConstructorDecl>(Best->Function); 2605 2606 case OR_No_Viable_Function: 2607 if (InitEntity) 2608 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2609 << InitEntity << Range; 2610 else 2611 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2612 << ClassType << Range; 2613 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2614 return 0; 2615 2616 case OR_Ambiguous: 2617 if (InitEntity) 2618 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2619 else 2620 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2621 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2622 return 0; 2623 2624 case OR_Deleted: 2625 if (InitEntity) 2626 Diag(Loc, diag::err_ovl_deleted_init) 2627 << Best->Function->isDeleted() 2628 << InitEntity << Range; 2629 else 2630 Diag(Loc, diag::err_ovl_deleted_init) 2631 << Best->Function->isDeleted() 2632 << InitEntity << Range; 2633 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2634 return 0; 2635 } 2636 2637 return 0; 2638} 2639 2640/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2641/// determine whether they are reference-related, 2642/// reference-compatible, reference-compatible with added 2643/// qualification, or incompatible, for use in C++ initialization by 2644/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2645/// type, and the first type (T1) is the pointee type of the reference 2646/// type being initialized. 2647Sema::ReferenceCompareResult 2648Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2649 bool& DerivedToBase) { 2650 assert(!T1->isReferenceType() && 2651 "T1 must be the pointee type of the reference type"); 2652 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2653 2654 T1 = Context.getCanonicalType(T1); 2655 T2 = Context.getCanonicalType(T2); 2656 QualType UnqualT1 = T1.getUnqualifiedType(); 2657 QualType UnqualT2 = T2.getUnqualifiedType(); 2658 2659 // C++ [dcl.init.ref]p4: 2660 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2661 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2662 // T1 is a base class of T2. 2663 if (UnqualT1 == UnqualT2) 2664 DerivedToBase = false; 2665 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2666 DerivedToBase = true; 2667 else 2668 return Ref_Incompatible; 2669 2670 // At this point, we know that T1 and T2 are reference-related (at 2671 // least). 2672 2673 // C++ [dcl.init.ref]p4: 2674 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2675 // reference-related to T2 and cv1 is the same cv-qualification 2676 // as, or greater cv-qualification than, cv2. For purposes of 2677 // overload resolution, cases for which cv1 is greater 2678 // cv-qualification than cv2 are identified as 2679 // reference-compatible with added qualification (see 13.3.3.2). 2680 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2681 return Ref_Compatible; 2682 else if (T1.isMoreQualifiedThan(T2)) 2683 return Ref_Compatible_With_Added_Qualification; 2684 else 2685 return Ref_Related; 2686} 2687 2688/// CheckReferenceInit - Check the initialization of a reference 2689/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2690/// the initializer (either a simple initializer or an initializer 2691/// list), and DeclType is the type of the declaration. When ICS is 2692/// non-null, this routine will compute the implicit conversion 2693/// sequence according to C++ [over.ics.ref] and will not produce any 2694/// diagnostics; when ICS is null, it will emit diagnostics when any 2695/// errors are found. Either way, a return value of true indicates 2696/// that there was a failure, a return value of false indicates that 2697/// the reference initialization succeeded. 2698/// 2699/// When @p SuppressUserConversions, user-defined conversions are 2700/// suppressed. 2701/// When @p AllowExplicit, we also permit explicit user-defined 2702/// conversion functions. 2703/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2704bool 2705Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2706 ImplicitConversionSequence *ICS, 2707 bool SuppressUserConversions, 2708 bool AllowExplicit, bool ForceRValue) { 2709 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2710 2711 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2712 QualType T2 = Init->getType(); 2713 2714 // If the initializer is the address of an overloaded function, try 2715 // to resolve the overloaded function. If all goes well, T2 is the 2716 // type of the resulting function. 2717 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2718 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2719 ICS != 0); 2720 if (Fn) { 2721 // Since we're performing this reference-initialization for 2722 // real, update the initializer with the resulting function. 2723 if (!ICS) { 2724 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2725 return true; 2726 2727 FixOverloadedFunctionReference(Init, Fn); 2728 } 2729 2730 T2 = Fn->getType(); 2731 } 2732 } 2733 2734 // Compute some basic properties of the types and the initializer. 2735 bool isRValRef = DeclType->isRValueReferenceType(); 2736 bool DerivedToBase = false; 2737 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2738 Init->isLvalue(Context); 2739 ReferenceCompareResult RefRelationship 2740 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2741 2742 // Most paths end in a failed conversion. 2743 if (ICS) 2744 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2745 2746 // C++ [dcl.init.ref]p5: 2747 // A reference to type "cv1 T1" is initialized by an expression 2748 // of type "cv2 T2" as follows: 2749 2750 // -- If the initializer expression 2751 2752 // Rvalue references cannot bind to lvalues (N2812). 2753 // There is absolutely no situation where they can. In particular, note that 2754 // this is ill-formed, even if B has a user-defined conversion to A&&: 2755 // B b; 2756 // A&& r = b; 2757 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2758 if (!ICS) 2759 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2760 << Init->getSourceRange(); 2761 return true; 2762 } 2763 2764 bool BindsDirectly = false; 2765 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2766 // reference-compatible with "cv2 T2," or 2767 // 2768 // Note that the bit-field check is skipped if we are just computing 2769 // the implicit conversion sequence (C++ [over.best.ics]p2). 2770 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2771 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2772 BindsDirectly = true; 2773 2774 if (ICS) { 2775 // C++ [over.ics.ref]p1: 2776 // When a parameter of reference type binds directly (8.5.3) 2777 // to an argument expression, the implicit conversion sequence 2778 // is the identity conversion, unless the argument expression 2779 // has a type that is a derived class of the parameter type, 2780 // in which case the implicit conversion sequence is a 2781 // derived-to-base Conversion (13.3.3.1). 2782 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2783 ICS->Standard.First = ICK_Identity; 2784 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2785 ICS->Standard.Third = ICK_Identity; 2786 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2787 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2788 ICS->Standard.ReferenceBinding = true; 2789 ICS->Standard.DirectBinding = true; 2790 ICS->Standard.RRefBinding = false; 2791 ICS->Standard.CopyConstructor = 0; 2792 2793 // Nothing more to do: the inaccessibility/ambiguity check for 2794 // derived-to-base conversions is suppressed when we're 2795 // computing the implicit conversion sequence (C++ 2796 // [over.best.ics]p2). 2797 return false; 2798 } else { 2799 // Perform the conversion. 2800 // FIXME: Binding to a subobject of the lvalue is going to require more 2801 // AST annotation than this. 2802 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2803 } 2804 } 2805 2806 // -- has a class type (i.e., T2 is a class type) and can be 2807 // implicitly converted to an lvalue of type "cv3 T3," 2808 // where "cv1 T1" is reference-compatible with "cv3 T3" 2809 // 92) (this conversion is selected by enumerating the 2810 // applicable conversion functions (13.3.1.6) and choosing 2811 // the best one through overload resolution (13.3)), 2812 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2813 // FIXME: Look for conversions in base classes! 2814 CXXRecordDecl *T2RecordDecl 2815 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2816 2817 OverloadCandidateSet CandidateSet; 2818 OverloadedFunctionDecl *Conversions 2819 = T2RecordDecl->getConversionFunctions(); 2820 for (OverloadedFunctionDecl::function_iterator Func 2821 = Conversions->function_begin(); 2822 Func != Conversions->function_end(); ++Func) { 2823 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2824 2825 // If the conversion function doesn't return a reference type, 2826 // it can't be considered for this conversion. 2827 if (Conv->getConversionType()->isLValueReferenceType() && 2828 (AllowExplicit || !Conv->isExplicit())) 2829 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2830 } 2831 2832 OverloadCandidateSet::iterator Best; 2833 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2834 case OR_Success: 2835 // This is a direct binding. 2836 BindsDirectly = true; 2837 2838 if (ICS) { 2839 // C++ [over.ics.ref]p1: 2840 // 2841 // [...] If the parameter binds directly to the result of 2842 // applying a conversion function to the argument 2843 // expression, the implicit conversion sequence is a 2844 // user-defined conversion sequence (13.3.3.1.2), with the 2845 // second standard conversion sequence either an identity 2846 // conversion or, if the conversion function returns an 2847 // entity of a type that is a derived class of the parameter 2848 // type, a derived-to-base Conversion. 2849 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2850 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2851 ICS->UserDefined.After = Best->FinalConversion; 2852 ICS->UserDefined.ConversionFunction = Best->Function; 2853 assert(ICS->UserDefined.After.ReferenceBinding && 2854 ICS->UserDefined.After.DirectBinding && 2855 "Expected a direct reference binding!"); 2856 return false; 2857 } else { 2858 // Perform the conversion. 2859 // FIXME: Binding to a subobject of the lvalue is going to require more 2860 // AST annotation than this. 2861 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2862 } 2863 break; 2864 2865 case OR_Ambiguous: 2866 assert(false && "Ambiguous reference binding conversions not implemented."); 2867 return true; 2868 2869 case OR_No_Viable_Function: 2870 case OR_Deleted: 2871 // There was no suitable conversion, or we found a deleted 2872 // conversion; continue with other checks. 2873 break; 2874 } 2875 } 2876 2877 if (BindsDirectly) { 2878 // C++ [dcl.init.ref]p4: 2879 // [...] In all cases where the reference-related or 2880 // reference-compatible relationship of two types is used to 2881 // establish the validity of a reference binding, and T1 is a 2882 // base class of T2, a program that necessitates such a binding 2883 // is ill-formed if T1 is an inaccessible (clause 11) or 2884 // ambiguous (10.2) base class of T2. 2885 // 2886 // Note that we only check this condition when we're allowed to 2887 // complain about errors, because we should not be checking for 2888 // ambiguity (or inaccessibility) unless the reference binding 2889 // actually happens. 2890 if (DerivedToBase) 2891 return CheckDerivedToBaseConversion(T2, T1, 2892 Init->getSourceRange().getBegin(), 2893 Init->getSourceRange()); 2894 else 2895 return false; 2896 } 2897 2898 // -- Otherwise, the reference shall be to a non-volatile const 2899 // type (i.e., cv1 shall be const), or the reference shall be an 2900 // rvalue reference and the initializer expression shall be an rvalue. 2901 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2902 if (!ICS) 2903 Diag(Init->getSourceRange().getBegin(), 2904 diag::err_not_reference_to_const_init) 2905 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2906 << T2 << Init->getSourceRange(); 2907 return true; 2908 } 2909 2910 // -- If the initializer expression is an rvalue, with T2 a 2911 // class type, and "cv1 T1" is reference-compatible with 2912 // "cv2 T2," the reference is bound in one of the 2913 // following ways (the choice is implementation-defined): 2914 // 2915 // -- The reference is bound to the object represented by 2916 // the rvalue (see 3.10) or to a sub-object within that 2917 // object. 2918 // 2919 // -- A temporary of type "cv1 T2" [sic] is created, and 2920 // a constructor is called to copy the entire rvalue 2921 // object into the temporary. The reference is bound to 2922 // the temporary or to a sub-object within the 2923 // temporary. 2924 // 2925 // The constructor that would be used to make the copy 2926 // shall be callable whether or not the copy is actually 2927 // done. 2928 // 2929 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2930 // freedom, so we will always take the first option and never build 2931 // a temporary in this case. FIXME: We will, however, have to check 2932 // for the presence of a copy constructor in C++98/03 mode. 2933 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2934 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2935 if (ICS) { 2936 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2937 ICS->Standard.First = ICK_Identity; 2938 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2939 ICS->Standard.Third = ICK_Identity; 2940 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2941 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2942 ICS->Standard.ReferenceBinding = true; 2943 ICS->Standard.DirectBinding = false; 2944 ICS->Standard.RRefBinding = isRValRef; 2945 ICS->Standard.CopyConstructor = 0; 2946 } else { 2947 // FIXME: Binding to a subobject of the rvalue is going to require more 2948 // AST annotation than this. 2949 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2950 } 2951 return false; 2952 } 2953 2954 // -- Otherwise, a temporary of type "cv1 T1" is created and 2955 // initialized from the initializer expression using the 2956 // rules for a non-reference copy initialization (8.5). The 2957 // reference is then bound to the temporary. If T1 is 2958 // reference-related to T2, cv1 must be the same 2959 // cv-qualification as, or greater cv-qualification than, 2960 // cv2; otherwise, the program is ill-formed. 2961 if (RefRelationship == Ref_Related) { 2962 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2963 // we would be reference-compatible or reference-compatible with 2964 // added qualification. But that wasn't the case, so the reference 2965 // initialization fails. 2966 if (!ICS) 2967 Diag(Init->getSourceRange().getBegin(), 2968 diag::err_reference_init_drops_quals) 2969 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2970 << T2 << Init->getSourceRange(); 2971 return true; 2972 } 2973 2974 // If at least one of the types is a class type, the types are not 2975 // related, and we aren't allowed any user conversions, the 2976 // reference binding fails. This case is important for breaking 2977 // recursion, since TryImplicitConversion below will attempt to 2978 // create a temporary through the use of a copy constructor. 2979 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2980 (T1->isRecordType() || T2->isRecordType())) { 2981 if (!ICS) 2982 Diag(Init->getSourceRange().getBegin(), 2983 diag::err_typecheck_convert_incompatible) 2984 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2985 return true; 2986 } 2987 2988 // Actually try to convert the initializer to T1. 2989 if (ICS) { 2990 // C++ [over.ics.ref]p2: 2991 // 2992 // When a parameter of reference type is not bound directly to 2993 // an argument expression, the conversion sequence is the one 2994 // required to convert the argument expression to the 2995 // underlying type of the reference according to 2996 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2997 // to copy-initializing a temporary of the underlying type with 2998 // the argument expression. Any difference in top-level 2999 // cv-qualification is subsumed by the initialization itself 3000 // and does not constitute a conversion. 3001 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 3002 // Of course, that's still a reference binding. 3003 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 3004 ICS->Standard.ReferenceBinding = true; 3005 ICS->Standard.RRefBinding = isRValRef; 3006 } else if(ICS->ConversionKind == 3007 ImplicitConversionSequence::UserDefinedConversion) { 3008 ICS->UserDefined.After.ReferenceBinding = true; 3009 ICS->UserDefined.After.RRefBinding = isRValRef; 3010 } 3011 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 3012 } else { 3013 return PerformImplicitConversion(Init, T1, "initializing"); 3014 } 3015} 3016 3017/// CheckOverloadedOperatorDeclaration - Check whether the declaration 3018/// of this overloaded operator is well-formed. If so, returns false; 3019/// otherwise, emits appropriate diagnostics and returns true. 3020bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 3021 assert(FnDecl && FnDecl->isOverloadedOperator() && 3022 "Expected an overloaded operator declaration"); 3023 3024 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 3025 3026 // C++ [over.oper]p5: 3027 // The allocation and deallocation functions, operator new, 3028 // operator new[], operator delete and operator delete[], are 3029 // described completely in 3.7.3. The attributes and restrictions 3030 // found in the rest of this subclause do not apply to them unless 3031 // explicitly stated in 3.7.3. 3032 // FIXME: Write a separate routine for checking this. For now, just allow it. 3033 if (Op == OO_New || Op == OO_Array_New || 3034 Op == OO_Delete || Op == OO_Array_Delete) 3035 return false; 3036 3037 // C++ [over.oper]p6: 3038 // An operator function shall either be a non-static member 3039 // function or be a non-member function and have at least one 3040 // parameter whose type is a class, a reference to a class, an 3041 // enumeration, or a reference to an enumeration. 3042 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3043 if (MethodDecl->isStatic()) 3044 return Diag(FnDecl->getLocation(), 3045 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3046 } else { 3047 bool ClassOrEnumParam = false; 3048 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3049 ParamEnd = FnDecl->param_end(); 3050 Param != ParamEnd; ++Param) { 3051 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3052 if (ParamType->isDependentType() || ParamType->isRecordType() || 3053 ParamType->isEnumeralType()) { 3054 ClassOrEnumParam = true; 3055 break; 3056 } 3057 } 3058 3059 if (!ClassOrEnumParam) 3060 return Diag(FnDecl->getLocation(), 3061 diag::err_operator_overload_needs_class_or_enum) 3062 << FnDecl->getDeclName(); 3063 } 3064 3065 // C++ [over.oper]p8: 3066 // An operator function cannot have default arguments (8.3.6), 3067 // except where explicitly stated below. 3068 // 3069 // Only the function-call operator allows default arguments 3070 // (C++ [over.call]p1). 3071 if (Op != OO_Call) { 3072 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3073 Param != FnDecl->param_end(); ++Param) { 3074 if ((*Param)->hasUnparsedDefaultArg()) 3075 return Diag((*Param)->getLocation(), 3076 diag::err_operator_overload_default_arg) 3077 << FnDecl->getDeclName(); 3078 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3079 return Diag((*Param)->getLocation(), 3080 diag::err_operator_overload_default_arg) 3081 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3082 } 3083 } 3084 3085 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3086 { false, false, false } 3087#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3088 , { Unary, Binary, MemberOnly } 3089#include "clang/Basic/OperatorKinds.def" 3090 }; 3091 3092 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3093 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3094 bool MustBeMemberOperator = OperatorUses[Op][2]; 3095 3096 // C++ [over.oper]p8: 3097 // [...] Operator functions cannot have more or fewer parameters 3098 // than the number required for the corresponding operator, as 3099 // described in the rest of this subclause. 3100 unsigned NumParams = FnDecl->getNumParams() 3101 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3102 if (Op != OO_Call && 3103 ((NumParams == 1 && !CanBeUnaryOperator) || 3104 (NumParams == 2 && !CanBeBinaryOperator) || 3105 (NumParams < 1) || (NumParams > 2))) { 3106 // We have the wrong number of parameters. 3107 unsigned ErrorKind; 3108 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3109 ErrorKind = 2; // 2 -> unary or binary. 3110 } else if (CanBeUnaryOperator) { 3111 ErrorKind = 0; // 0 -> unary 3112 } else { 3113 assert(CanBeBinaryOperator && 3114 "All non-call overloaded operators are unary or binary!"); 3115 ErrorKind = 1; // 1 -> binary 3116 } 3117 3118 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3119 << FnDecl->getDeclName() << NumParams << ErrorKind; 3120 } 3121 3122 // Overloaded operators other than operator() cannot be variadic. 3123 if (Op != OO_Call && 3124 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3125 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3126 << FnDecl->getDeclName(); 3127 } 3128 3129 // Some operators must be non-static member functions. 3130 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3131 return Diag(FnDecl->getLocation(), 3132 diag::err_operator_overload_must_be_member) 3133 << FnDecl->getDeclName(); 3134 } 3135 3136 // C++ [over.inc]p1: 3137 // The user-defined function called operator++ implements the 3138 // prefix and postfix ++ operator. If this function is a member 3139 // function with no parameters, or a non-member function with one 3140 // parameter of class or enumeration type, it defines the prefix 3141 // increment operator ++ for objects of that type. If the function 3142 // is a member function with one parameter (which shall be of type 3143 // int) or a non-member function with two parameters (the second 3144 // of which shall be of type int), it defines the postfix 3145 // increment operator ++ for objects of that type. 3146 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3147 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3148 bool ParamIsInt = false; 3149 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3150 ParamIsInt = BT->getKind() == BuiltinType::Int; 3151 3152 if (!ParamIsInt) 3153 return Diag(LastParam->getLocation(), 3154 diag::err_operator_overload_post_incdec_must_be_int) 3155 << LastParam->getType() << (Op == OO_MinusMinus); 3156 } 3157 3158 // Notify the class if it got an assignment operator. 3159 if (Op == OO_Equal) { 3160 // Would have returned earlier otherwise. 3161 assert(isa<CXXMethodDecl>(FnDecl) && 3162 "Overloaded = not member, but not filtered."); 3163 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3164 Method->setCopyAssignment(true); 3165 Method->getParent()->addedAssignmentOperator(Context, Method); 3166 } 3167 3168 return false; 3169} 3170 3171/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3172/// linkage specification, including the language and (if present) 3173/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3174/// the location of the language string literal, which is provided 3175/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3176/// the '{' brace. Otherwise, this linkage specification does not 3177/// have any braces. 3178Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3179 SourceLocation ExternLoc, 3180 SourceLocation LangLoc, 3181 const char *Lang, 3182 unsigned StrSize, 3183 SourceLocation LBraceLoc) { 3184 LinkageSpecDecl::LanguageIDs Language; 3185 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3186 Language = LinkageSpecDecl::lang_c; 3187 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3188 Language = LinkageSpecDecl::lang_cxx; 3189 else { 3190 Diag(LangLoc, diag::err_bad_language); 3191 return DeclPtrTy(); 3192 } 3193 3194 // FIXME: Add all the various semantics of linkage specifications 3195 3196 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3197 LangLoc, Language, 3198 LBraceLoc.isValid()); 3199 CurContext->addDecl(D); 3200 PushDeclContext(S, D); 3201 return DeclPtrTy::make(D); 3202} 3203 3204/// ActOnFinishLinkageSpecification - Completely the definition of 3205/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3206/// valid, it's the position of the closing '}' brace in a linkage 3207/// specification that uses braces. 3208Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3209 DeclPtrTy LinkageSpec, 3210 SourceLocation RBraceLoc) { 3211 if (LinkageSpec) 3212 PopDeclContext(); 3213 return LinkageSpec; 3214} 3215 3216/// \brief Perform semantic analysis for the variable declaration that 3217/// occurs within a C++ catch clause, returning the newly-created 3218/// variable. 3219VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3220 IdentifierInfo *Name, 3221 SourceLocation Loc, 3222 SourceRange Range) { 3223 bool Invalid = false; 3224 3225 // Arrays and functions decay. 3226 if (ExDeclType->isArrayType()) 3227 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3228 else if (ExDeclType->isFunctionType()) 3229 ExDeclType = Context.getPointerType(ExDeclType); 3230 3231 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3232 // The exception-declaration shall not denote a pointer or reference to an 3233 // incomplete type, other than [cv] void*. 3234 // N2844 forbids rvalue references. 3235 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3236 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3237 Invalid = true; 3238 } 3239 3240 QualType BaseType = ExDeclType; 3241 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3242 unsigned DK = diag::err_catch_incomplete; 3243 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3244 BaseType = Ptr->getPointeeType(); 3245 Mode = 1; 3246 DK = diag::err_catch_incomplete_ptr; 3247 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3248 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3249 BaseType = Ref->getPointeeType(); 3250 Mode = 2; 3251 DK = diag::err_catch_incomplete_ref; 3252 } 3253 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3254 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3255 Invalid = true; 3256 3257 if (!Invalid && !ExDeclType->isDependentType() && 3258 RequireNonAbstractType(Loc, ExDeclType, 3259 diag::err_abstract_type_in_decl, 3260 AbstractVariableType)) 3261 Invalid = true; 3262 3263 // FIXME: Need to test for ability to copy-construct and destroy the 3264 // exception variable. 3265 3266 // FIXME: Need to check for abstract classes. 3267 3268 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3269 Name, ExDeclType, VarDecl::None, 3270 Range.getBegin()); 3271 3272 if (Invalid) 3273 ExDecl->setInvalidDecl(); 3274 3275 return ExDecl; 3276} 3277 3278/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3279/// handler. 3280Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3281 QualType ExDeclType = GetTypeForDeclarator(D, S); 3282 3283 bool Invalid = D.isInvalidType(); 3284 IdentifierInfo *II = D.getIdentifier(); 3285 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3286 // The scope should be freshly made just for us. There is just no way 3287 // it contains any previous declaration. 3288 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3289 if (PrevDecl->isTemplateParameter()) { 3290 // Maybe we will complain about the shadowed template parameter. 3291 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3292 } 3293 } 3294 3295 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3296 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3297 << D.getCXXScopeSpec().getRange(); 3298 Invalid = true; 3299 } 3300 3301 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3302 D.getIdentifier(), 3303 D.getIdentifierLoc(), 3304 D.getDeclSpec().getSourceRange()); 3305 3306 if (Invalid) 3307 ExDecl->setInvalidDecl(); 3308 3309 // Add the exception declaration into this scope. 3310 if (II) 3311 PushOnScopeChains(ExDecl, S); 3312 else 3313 CurContext->addDecl(ExDecl); 3314 3315 ProcessDeclAttributes(S, ExDecl, D); 3316 return DeclPtrTy::make(ExDecl); 3317} 3318 3319Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3320 ExprArg assertexpr, 3321 ExprArg assertmessageexpr) { 3322 Expr *AssertExpr = (Expr *)assertexpr.get(); 3323 StringLiteral *AssertMessage = 3324 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3325 3326 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3327 llvm::APSInt Value(32); 3328 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3329 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3330 AssertExpr->getSourceRange(); 3331 return DeclPtrTy(); 3332 } 3333 3334 if (Value == 0) { 3335 std::string str(AssertMessage->getStrData(), 3336 AssertMessage->getByteLength()); 3337 Diag(AssertLoc, diag::err_static_assert_failed) 3338 << str << AssertExpr->getSourceRange(); 3339 } 3340 } 3341 3342 assertexpr.release(); 3343 assertmessageexpr.release(); 3344 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3345 AssertExpr, AssertMessage); 3346 3347 CurContext->addDecl(Decl); 3348 return DeclPtrTy::make(Decl); 3349} 3350 3351Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3352 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3353 bool IsDefinition) { 3354 Declarator *D = DU.dyn_cast<Declarator*>(); 3355 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3356 3357 assert(DS.isFriendSpecified()); 3358 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3359 3360 // If there's no declarator, then this can only be a friend class 3361 // declaration (or else it's just syntactically invalid). 3362 if (!D) { 3363 SourceLocation Loc = DS.getSourceRange().getBegin(); 3364 3365 QualType T; 3366 DeclContext *DC; 3367 3368 // In C++0x, we just accept any old type. 3369 if (getLangOptions().CPlusPlus0x) { 3370 bool invalid = false; 3371 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3372 if (invalid) 3373 return DeclPtrTy(); 3374 3375 // The semantic context in which to create the decl. If it's not 3376 // a record decl (or we don't yet know if it is), create it in the 3377 // current context. 3378 DC = CurContext; 3379 if (const RecordType *RT = T->getAs<RecordType>()) 3380 DC = RT->getDecl()->getDeclContext(); 3381 3382 // The C++98 rules are somewhat more complex. 3383 } else { 3384 // C++ [class.friend]p2: 3385 // An elaborated-type-specifier shall be used in a friend declaration 3386 // for a class.* 3387 // * The class-key of the elaborated-type-specifier is required. 3388 CXXRecordDecl *RD = 0; 3389 3390 switch (DS.getTypeSpecType()) { 3391 case DeclSpec::TST_class: 3392 case DeclSpec::TST_struct: 3393 case DeclSpec::TST_union: 3394 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3395 if (!RD) return DeclPtrTy(); 3396 break; 3397 3398 case DeclSpec::TST_typename: 3399 if (const RecordType *RT = 3400 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3401 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3402 // fallthrough 3403 default: 3404 if (RD) { 3405 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3406 << (RD->isUnion()) 3407 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3408 RD->isUnion() ? " union" : " class"); 3409 return DeclPtrTy::make(RD); 3410 } 3411 3412 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3413 << DS.getSourceRange(); 3414 return DeclPtrTy(); 3415 } 3416 3417 // The record declaration we get from friend declarations is not 3418 // canonicalized; see ActOnTag. 3419 assert(RD); 3420 3421 // C++ [class.friend]p2: A class shall not be defined inside 3422 // a friend declaration. 3423 if (RD->isDefinition()) 3424 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3425 << RD->getSourceRange(); 3426 3427 // C++98 [class.friend]p1: A friend of a class is a function 3428 // or class that is not a member of the class . . . 3429 // But that's a silly restriction which nobody implements for 3430 // inner classes, and C++0x removes it anyway, so we only report 3431 // this (as a warning) if we're being pedantic. 3432 // 3433 // Also, definitions currently get treated in a way that causes 3434 // this error, so only report it if we didn't see a definition. 3435 else if (RD->getDeclContext() == CurContext && 3436 !getLangOptions().CPlusPlus0x) 3437 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3438 3439 T = QualType(RD->getTypeForDecl(), 0); 3440 DC = RD->getDeclContext(); 3441 } 3442 3443 FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T, 3444 DS.getFriendSpecLoc()); 3445 FCD->setLexicalDeclContext(CurContext); 3446 3447 if (CurContext->isDependentContext()) 3448 CurContext->addHiddenDecl(FCD); 3449 else 3450 CurContext->addDecl(FCD); 3451 3452 return DeclPtrTy::make(FCD); 3453 } 3454 3455 // We have a declarator. 3456 assert(D); 3457 3458 SourceLocation Loc = D->getIdentifierLoc(); 3459 QualType T = GetTypeForDeclarator(*D, S); 3460 3461 // C++ [class.friend]p1 3462 // A friend of a class is a function or class.... 3463 // Note that this sees through typedefs, which is intended. 3464 if (!T->isFunctionType()) { 3465 Diag(Loc, diag::err_unexpected_friend); 3466 3467 // It might be worthwhile to try to recover by creating an 3468 // appropriate declaration. 3469 return DeclPtrTy(); 3470 } 3471 3472 // C++ [namespace.memdef]p3 3473 // - If a friend declaration in a non-local class first declares a 3474 // class or function, the friend class or function is a member 3475 // of the innermost enclosing namespace. 3476 // - The name of the friend is not found by simple name lookup 3477 // until a matching declaration is provided in that namespace 3478 // scope (either before or after the class declaration granting 3479 // friendship). 3480 // - If a friend function is called, its name may be found by the 3481 // name lookup that considers functions from namespaces and 3482 // classes associated with the types of the function arguments. 3483 // - When looking for a prior declaration of a class or a function 3484 // declared as a friend, scopes outside the innermost enclosing 3485 // namespace scope are not considered. 3486 3487 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3488 DeclarationName Name = GetNameForDeclarator(*D); 3489 assert(Name); 3490 3491 // The existing declaration we found. 3492 FunctionDecl *FD = NULL; 3493 3494 // The context we found the declaration in, or in which we should 3495 // create the declaration. 3496 DeclContext *DC; 3497 3498 // FIXME: handle local classes 3499 3500 // Recover from invalid scope qualifiers as if they just weren't there. 3501 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3502 DC = computeDeclContext(ScopeQual); 3503 3504 // FIXME: handle dependent contexts 3505 if (!DC) return DeclPtrTy(); 3506 3507 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3508 3509 // If searching in that context implicitly found a declaration in 3510 // a different context, treat it like it wasn't found at all. 3511 // TODO: better diagnostics for this case. Suggesting the right 3512 // qualified scope would be nice... 3513 if (!Dec || Dec->getDeclContext() != DC) { 3514 D->setInvalidType(); 3515 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3516 return DeclPtrTy(); 3517 } 3518 3519 // C++ [class.friend]p1: A friend of a class is a function or 3520 // class that is not a member of the class . . . 3521 if (DC == CurContext) 3522 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3523 3524 FD = cast<FunctionDecl>(Dec); 3525 3526 // Otherwise walk out to the nearest namespace scope looking for matches. 3527 } else { 3528 // TODO: handle local class contexts. 3529 3530 DC = CurContext; 3531 while (true) { 3532 // Skip class contexts. If someone can cite chapter and verse 3533 // for this behavior, that would be nice --- it's what GCC and 3534 // EDG do, and it seems like a reasonable intent, but the spec 3535 // really only says that checks for unqualified existing 3536 // declarations should stop at the nearest enclosing namespace, 3537 // not that they should only consider the nearest enclosing 3538 // namespace. 3539 while (DC->isRecord()) DC = DC->getParent(); 3540 3541 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3542 3543 // TODO: decide what we think about using declarations. 3544 if (Dec) { 3545 FD = cast<FunctionDecl>(Dec); 3546 break; 3547 } 3548 if (DC->isFileContext()) break; 3549 DC = DC->getParent(); 3550 } 3551 3552 // C++ [class.friend]p1: A friend of a class is a function or 3553 // class that is not a member of the class . . . 3554 // C++0x changes this for both friend types and functions. 3555 // Most C++ 98 compilers do seem to give an error here, so 3556 // we do, too. 3557 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3558 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3559 } 3560 3561 bool Redeclaration = (FD != 0); 3562 3563 // If we found a match, create a friend function declaration with 3564 // that function as the previous declaration. 3565 if (Redeclaration) { 3566 // Create it in the semantic context of the original declaration. 3567 DC = FD->getDeclContext(); 3568 3569 // If we didn't find something matching the type exactly, create 3570 // a declaration. This declaration should only be findable via 3571 // argument-dependent lookup. 3572 } else { 3573 assert(DC->isFileContext()); 3574 3575 // This implies that it has to be an operator or function. 3576 if (D->getKind() == Declarator::DK_Constructor || 3577 D->getKind() == Declarator::DK_Destructor || 3578 D->getKind() == Declarator::DK_Conversion) { 3579 Diag(Loc, diag::err_introducing_special_friend) << 3580 (D->getKind() == Declarator::DK_Constructor ? 0 : 3581 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3582 return DeclPtrTy(); 3583 } 3584 } 3585 3586 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, 3587 /* PrevDecl = */ FD, 3588 MultiTemplateParamsArg(*this), 3589 IsDefinition, 3590 Redeclaration); 3591 FD = cast_or_null<FriendFunctionDecl>(ND); 3592 3593 assert(FD->getDeclContext() == DC); 3594 assert(FD->getLexicalDeclContext() == CurContext); 3595 3596 // If this is a dependent context, just add the decl to the 3597 // class's decl list and don't both with the lookup tables. This 3598 // doesn't affect lookup because any call that might find this 3599 // function via ADL necessarily has to involve dependently-typed 3600 // arguments and hence can't be resolved until 3601 // template-instantiation anyway. 3602 if (CurContext->isDependentContext()) 3603 CurContext->addHiddenDecl(FD); 3604 else 3605 CurContext->addDecl(FD); 3606 3607 return DeclPtrTy::make(FD); 3608} 3609 3610void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3611 Decl *Dcl = dcl.getAs<Decl>(); 3612 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3613 if (!Fn) { 3614 Diag(DelLoc, diag::err_deleted_non_function); 3615 return; 3616 } 3617 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3618 Diag(DelLoc, diag::err_deleted_decl_not_first); 3619 Diag(Prev->getLocation(), diag::note_previous_declaration); 3620 // If the declaration wasn't the first, we delete the function anyway for 3621 // recovery. 3622 } 3623 Fn->setDeleted(); 3624} 3625 3626static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3627 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3628 ++CI) { 3629 Stmt *SubStmt = *CI; 3630 if (!SubStmt) 3631 continue; 3632 if (isa<ReturnStmt>(SubStmt)) 3633 Self.Diag(SubStmt->getSourceRange().getBegin(), 3634 diag::err_return_in_constructor_handler); 3635 if (!isa<Expr>(SubStmt)) 3636 SearchForReturnInStmt(Self, SubStmt); 3637 } 3638} 3639 3640void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3641 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3642 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3643 SearchForReturnInStmt(*this, Handler); 3644 } 3645} 3646 3647bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3648 const CXXMethodDecl *Old) { 3649 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3650 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3651 3652 QualType CNewTy = Context.getCanonicalType(NewTy); 3653 QualType COldTy = Context.getCanonicalType(OldTy); 3654 3655 if (CNewTy == COldTy && 3656 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3657 return false; 3658 3659 // Check if the return types are covariant 3660 QualType NewClassTy, OldClassTy; 3661 3662 /// Both types must be pointers or references to classes. 3663 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3664 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3665 NewClassTy = NewPT->getPointeeType(); 3666 OldClassTy = OldPT->getPointeeType(); 3667 } 3668 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3669 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3670 NewClassTy = NewRT->getPointeeType(); 3671 OldClassTy = OldRT->getPointeeType(); 3672 } 3673 } 3674 3675 // The return types aren't either both pointers or references to a class type. 3676 if (NewClassTy.isNull()) { 3677 Diag(New->getLocation(), 3678 diag::err_different_return_type_for_overriding_virtual_function) 3679 << New->getDeclName() << NewTy << OldTy; 3680 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3681 3682 return true; 3683 } 3684 3685 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3686 // Check if the new class derives from the old class. 3687 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3688 Diag(New->getLocation(), 3689 diag::err_covariant_return_not_derived) 3690 << New->getDeclName() << NewTy << OldTy; 3691 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3692 return true; 3693 } 3694 3695 // Check if we the conversion from derived to base is valid. 3696 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3697 diag::err_covariant_return_inaccessible_base, 3698 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3699 // FIXME: Should this point to the return type? 3700 New->getLocation(), SourceRange(), New->getDeclName())) { 3701 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3702 return true; 3703 } 3704 } 3705 3706 // The qualifiers of the return types must be the same. 3707 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3708 Diag(New->getLocation(), 3709 diag::err_covariant_return_type_different_qualifications) 3710 << New->getDeclName() << NewTy << OldTy; 3711 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3712 return true; 3713 }; 3714 3715 3716 // The new class type must have the same or less qualifiers as the old type. 3717 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3718 Diag(New->getLocation(), 3719 diag::err_covariant_return_type_class_type_more_qualified) 3720 << New->getDeclName() << NewTy << OldTy; 3721 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3722 return true; 3723 }; 3724 3725 return false; 3726} 3727 3728bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3729 const CXXMethodDecl *Old) 3730{ 3731 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3732 diag::note_overridden_virtual_function, 3733 Old->getType()->getAsFunctionProtoType(), 3734 Old->getLocation(), 3735 New->getType()->getAsFunctionProtoType(), 3736 New->getLocation()); 3737} 3738 3739/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3740/// initializer for the declaration 'Dcl'. 3741/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3742/// static data member of class X, names should be looked up in the scope of 3743/// class X. 3744void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3745 Decl *D = Dcl.getAs<Decl>(); 3746 // If there is no declaration, there was an error parsing it. 3747 if (D == 0) 3748 return; 3749 3750 // Check whether it is a declaration with a nested name specifier like 3751 // int foo::bar; 3752 if (!D->isOutOfLine()) 3753 return; 3754 3755 // C++ [basic.lookup.unqual]p13 3756 // 3757 // A name used in the definition of a static data member of class X 3758 // (after the qualified-id of the static member) is looked up as if the name 3759 // was used in a member function of X. 3760 3761 // Change current context into the context of the initializing declaration. 3762 EnterDeclaratorContext(S, D->getDeclContext()); 3763} 3764 3765/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3766/// initializer for the declaration 'Dcl'. 3767void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3768 Decl *D = Dcl.getAs<Decl>(); 3769 // If there is no declaration, there was an error parsing it. 3770 if (D == 0) 3771 return; 3772 3773 // Check whether it is a declaration with a nested name specifier like 3774 // int foo::bar; 3775 if (!D->isOutOfLine()) 3776 return; 3777 3778 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3779 ExitDeclaratorContext(S); 3780} 3781