SemaDeclCXX.cpp revision 87595e46ccd61c9b7c08074c2c64b66b5c0fc694
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 if (CheckEquivalentExceptionSpec( 262 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 263 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 264 Invalid = true; 265 } 266 267 return Invalid; 268} 269 270/// CheckCXXDefaultArguments - Verify that the default arguments for a 271/// function declaration are well-formed according to C++ 272/// [dcl.fct.default]. 273void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 274 unsigned NumParams = FD->getNumParams(); 275 unsigned p; 276 277 // Find first parameter with a default argument 278 for (p = 0; p < NumParams; ++p) { 279 ParmVarDecl *Param = FD->getParamDecl(p); 280 if (Param->getDefaultArg()) 281 break; 282 } 283 284 // C++ [dcl.fct.default]p4: 285 // In a given function declaration, all parameters 286 // subsequent to a parameter with a default argument shall 287 // have default arguments supplied in this or previous 288 // declarations. A default argument shall not be redefined 289 // by a later declaration (not even to the same value). 290 unsigned LastMissingDefaultArg = 0; 291 for(; p < NumParams; ++p) { 292 ParmVarDecl *Param = FD->getParamDecl(p); 293 if (!Param->getDefaultArg()) { 294 if (Param->isInvalidDecl()) 295 /* We already complained about this parameter. */; 296 else if (Param->getIdentifier()) 297 Diag(Param->getLocation(), 298 diag::err_param_default_argument_missing_name) 299 << Param->getIdentifier(); 300 else 301 Diag(Param->getLocation(), 302 diag::err_param_default_argument_missing); 303 304 LastMissingDefaultArg = p; 305 } 306 } 307 308 if (LastMissingDefaultArg > 0) { 309 // Some default arguments were missing. Clear out all of the 310 // default arguments up to (and including) the last missing 311 // default argument, so that we leave the function parameters 312 // in a semantically valid state. 313 for (p = 0; p <= LastMissingDefaultArg; ++p) { 314 ParmVarDecl *Param = FD->getParamDecl(p); 315 if (Param->hasDefaultArg()) { 316 if (!Param->hasUnparsedDefaultArg()) 317 Param->getDefaultArg()->Destroy(Context); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322} 323 324/// isCurrentClassName - Determine whether the identifier II is the 325/// name of the class type currently being defined. In the case of 326/// nested classes, this will only return true if II is the name of 327/// the innermost class. 328bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 329 const CXXScopeSpec *SS) { 330 CXXRecordDecl *CurDecl; 331 if (SS && SS->isSet() && !SS->isInvalid()) { 332 DeclContext *DC = computeDeclContext(*SS); 333 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 334 } else 335 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 336 337 if (CurDecl) 338 return &II == CurDecl->getIdentifier(); 339 else 340 return false; 341} 342 343/// \brief Check the validity of a C++ base class specifier. 344/// 345/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 346/// and returns NULL otherwise. 347CXXBaseSpecifier * 348Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 349 SourceRange SpecifierRange, 350 bool Virtual, AccessSpecifier Access, 351 QualType BaseType, 352 SourceLocation BaseLoc) { 353 // C++ [class.union]p1: 354 // A union shall not have base classes. 355 if (Class->isUnion()) { 356 Diag(Class->getLocation(), diag::err_base_clause_on_union) 357 << SpecifierRange; 358 return 0; 359 } 360 361 if (BaseType->isDependentType()) 362 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 363 Class->getTagKind() == RecordDecl::TK_class, 364 Access, BaseType); 365 366 // Base specifiers must be record types. 367 if (!BaseType->isRecordType()) { 368 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 369 return 0; 370 } 371 372 // C++ [class.union]p1: 373 // A union shall not be used as a base class. 374 if (BaseType->isUnionType()) { 375 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 376 return 0; 377 } 378 379 // C++ [class.derived]p2: 380 // The class-name in a base-specifier shall not be an incompletely 381 // defined class. 382 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 383 SpecifierRange)) 384 return 0; 385 386 // If the base class is polymorphic, the new one is, too. 387 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 388 assert(BaseDecl && "Record type has no declaration"); 389 BaseDecl = BaseDecl->getDefinition(Context); 390 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 391 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 392 Class->setPolymorphic(true); 393 394 // C++ [dcl.init.aggr]p1: 395 // An aggregate is [...] a class with [...] no base classes [...]. 396 Class->setAggregate(false); 397 Class->setPOD(false); 398 399 if (Virtual) { 400 // C++ [class.ctor]p5: 401 // A constructor is trivial if its class has no virtual base classes. 402 Class->setHasTrivialConstructor(false); 403 404 // C++ [class.copy]p6: 405 // A copy constructor is trivial if its class has no virtual base classes. 406 Class->setHasTrivialCopyConstructor(false); 407 408 // C++ [class.copy]p11: 409 // A copy assignment operator is trivial if its class has no virtual 410 // base classes. 411 Class->setHasTrivialCopyAssignment(false); 412 } else { 413 // C++ [class.ctor]p5: 414 // A constructor is trivial if all the direct base classes of its 415 // class have trivial constructors. 416 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 417 Class->setHasTrivialConstructor(false); 418 419 // C++ [class.copy]p6: 420 // A copy constructor is trivial if all the direct base classes of its 421 // class have trivial copy constructors. 422 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 423 Class->setHasTrivialCopyConstructor(false); 424 425 // C++ [class.copy]p11: 426 // A copy assignment operator is trivial if all the direct base classes 427 // of its class have trivial copy assignment operators. 428 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 429 Class->setHasTrivialCopyAssignment(false); 430 } 431 432 // C++ [class.ctor]p3: 433 // A destructor is trivial if all the direct base classes of its class 434 // have trivial destructors. 435 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 436 Class->setHasTrivialDestructor(false); 437 438 // Create the base specifier. 439 // FIXME: Allocate via ASTContext? 440 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 441 Class->getTagKind() == RecordDecl::TK_class, 442 Access, BaseType); 443} 444 445/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 446/// one entry in the base class list of a class specifier, for 447/// example: 448/// class foo : public bar, virtual private baz { 449/// 'public bar' and 'virtual private baz' are each base-specifiers. 450Sema::BaseResult 451Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 452 bool Virtual, AccessSpecifier Access, 453 TypeTy *basetype, SourceLocation BaseLoc) { 454 if (!classdecl) 455 return true; 456 457 AdjustDeclIfTemplate(classdecl); 458 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 459 QualType BaseType = QualType::getFromOpaquePtr(basetype); 460 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 461 Virtual, Access, 462 BaseType, BaseLoc)) 463 return BaseSpec; 464 465 return true; 466} 467 468/// \brief Performs the actual work of attaching the given base class 469/// specifiers to a C++ class. 470bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 471 unsigned NumBases) { 472 if (NumBases == 0) 473 return false; 474 475 // Used to keep track of which base types we have already seen, so 476 // that we can properly diagnose redundant direct base types. Note 477 // that the key is always the unqualified canonical type of the base 478 // class. 479 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 480 481 // Copy non-redundant base specifiers into permanent storage. 482 unsigned NumGoodBases = 0; 483 bool Invalid = false; 484 for (unsigned idx = 0; idx < NumBases; ++idx) { 485 QualType NewBaseType 486 = Context.getCanonicalType(Bases[idx]->getType()); 487 NewBaseType = NewBaseType.getUnqualifiedType(); 488 489 if (KnownBaseTypes[NewBaseType]) { 490 // C++ [class.mi]p3: 491 // A class shall not be specified as a direct base class of a 492 // derived class more than once. 493 Diag(Bases[idx]->getSourceRange().getBegin(), 494 diag::err_duplicate_base_class) 495 << KnownBaseTypes[NewBaseType]->getType() 496 << Bases[idx]->getSourceRange(); 497 498 // Delete the duplicate base class specifier; we're going to 499 // overwrite its pointer later. 500 Context.Deallocate(Bases[idx]); 501 502 Invalid = true; 503 } else { 504 // Okay, add this new base class. 505 KnownBaseTypes[NewBaseType] = Bases[idx]; 506 Bases[NumGoodBases++] = Bases[idx]; 507 } 508 } 509 510 // Attach the remaining base class specifiers to the derived class. 511 Class->setBases(Context, Bases, NumGoodBases); 512 513 // Delete the remaining (good) base class specifiers, since their 514 // data has been copied into the CXXRecordDecl. 515 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 516 Context.Deallocate(Bases[idx]); 517 518 return Invalid; 519} 520 521/// ActOnBaseSpecifiers - Attach the given base specifiers to the 522/// class, after checking whether there are any duplicate base 523/// classes. 524void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 525 unsigned NumBases) { 526 if (!ClassDecl || !Bases || !NumBases) 527 return; 528 529 AdjustDeclIfTemplate(ClassDecl); 530 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 531 (CXXBaseSpecifier**)(Bases), NumBases); 532} 533 534//===----------------------------------------------------------------------===// 535// C++ class member Handling 536//===----------------------------------------------------------------------===// 537 538/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 539/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 540/// bitfield width if there is one and 'InitExpr' specifies the initializer if 541/// any. 542Sema::DeclPtrTy 543Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 544 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 545 const DeclSpec &DS = D.getDeclSpec(); 546 DeclarationName Name = GetNameForDeclarator(D); 547 Expr *BitWidth = static_cast<Expr*>(BW); 548 Expr *Init = static_cast<Expr*>(InitExpr); 549 SourceLocation Loc = D.getIdentifierLoc(); 550 551 bool isFunc = D.isFunctionDeclarator(); 552 553 // C++ 9.2p6: A member shall not be declared to have automatic storage 554 // duration (auto, register) or with the extern storage-class-specifier. 555 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 556 // data members and cannot be applied to names declared const or static, 557 // and cannot be applied to reference members. 558 switch (DS.getStorageClassSpec()) { 559 case DeclSpec::SCS_unspecified: 560 case DeclSpec::SCS_typedef: 561 case DeclSpec::SCS_static: 562 // FALL THROUGH. 563 break; 564 case DeclSpec::SCS_mutable: 565 if (isFunc) { 566 if (DS.getStorageClassSpecLoc().isValid()) 567 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 568 else 569 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 570 571 // FIXME: It would be nicer if the keyword was ignored only for this 572 // declarator. Otherwise we could get follow-up errors. 573 D.getMutableDeclSpec().ClearStorageClassSpecs(); 574 } else { 575 QualType T = GetTypeForDeclarator(D, S); 576 diag::kind err = static_cast<diag::kind>(0); 577 if (T->isReferenceType()) 578 err = diag::err_mutable_reference; 579 else if (T.isConstQualified()) 580 err = diag::err_mutable_const; 581 if (err != 0) { 582 if (DS.getStorageClassSpecLoc().isValid()) 583 Diag(DS.getStorageClassSpecLoc(), err); 584 else 585 Diag(DS.getThreadSpecLoc(), err); 586 // FIXME: It would be nicer if the keyword was ignored only for this 587 // declarator. Otherwise we could get follow-up errors. 588 D.getMutableDeclSpec().ClearStorageClassSpecs(); 589 } 590 } 591 break; 592 default: 593 if (DS.getStorageClassSpecLoc().isValid()) 594 Diag(DS.getStorageClassSpecLoc(), 595 diag::err_storageclass_invalid_for_member); 596 else 597 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 598 D.getMutableDeclSpec().ClearStorageClassSpecs(); 599 } 600 601 if (!isFunc && 602 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 603 D.getNumTypeObjects() == 0) { 604 // Check also for this case: 605 // 606 // typedef int f(); 607 // f a; 608 // 609 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 610 isFunc = TDType->isFunctionType(); 611 } 612 613 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 614 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 615 !isFunc); 616 617 Decl *Member; 618 if (isInstField) { 619 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 620 AS); 621 assert(Member && "HandleField never returns null"); 622 } else { 623 Member = ActOnDeclarator(S, D).getAs<Decl>(); 624 if (!Member) { 625 if (BitWidth) DeleteExpr(BitWidth); 626 return DeclPtrTy(); 627 } 628 629 // Non-instance-fields can't have a bitfield. 630 if (BitWidth) { 631 if (Member->isInvalidDecl()) { 632 // don't emit another diagnostic. 633 } else if (isa<VarDecl>(Member)) { 634 // C++ 9.6p3: A bit-field shall not be a static member. 635 // "static member 'A' cannot be a bit-field" 636 Diag(Loc, diag::err_static_not_bitfield) 637 << Name << BitWidth->getSourceRange(); 638 } else if (isa<TypedefDecl>(Member)) { 639 // "typedef member 'x' cannot be a bit-field" 640 Diag(Loc, diag::err_typedef_not_bitfield) 641 << Name << BitWidth->getSourceRange(); 642 } else { 643 // A function typedef ("typedef int f(); f a;"). 644 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 645 Diag(Loc, diag::err_not_integral_type_bitfield) 646 << Name << cast<ValueDecl>(Member)->getType() 647 << BitWidth->getSourceRange(); 648 } 649 650 DeleteExpr(BitWidth); 651 BitWidth = 0; 652 Member->setInvalidDecl(); 653 } 654 655 Member->setAccess(AS); 656 } 657 658 assert((Name || isInstField) && "No identifier for non-field ?"); 659 660 if (Init) 661 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 662 if (Deleted) // FIXME: Source location is not very good. 663 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 664 665 if (isInstField) { 666 FieldCollector->Add(cast<FieldDecl>(Member)); 667 return DeclPtrTy(); 668 } 669 return DeclPtrTy::make(Member); 670} 671 672/// ActOnMemInitializer - Handle a C++ member initializer. 673Sema::MemInitResult 674Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 675 Scope *S, 676 const CXXScopeSpec &SS, 677 IdentifierInfo *MemberOrBase, 678 TypeTy *TemplateTypeTy, 679 SourceLocation IdLoc, 680 SourceLocation LParenLoc, 681 ExprTy **Args, unsigned NumArgs, 682 SourceLocation *CommaLocs, 683 SourceLocation RParenLoc) { 684 if (!ConstructorD) 685 return true; 686 687 CXXConstructorDecl *Constructor 688 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 689 if (!Constructor) { 690 // The user wrote a constructor initializer on a function that is 691 // not a C++ constructor. Ignore the error for now, because we may 692 // have more member initializers coming; we'll diagnose it just 693 // once in ActOnMemInitializers. 694 return true; 695 } 696 697 CXXRecordDecl *ClassDecl = Constructor->getParent(); 698 699 // C++ [class.base.init]p2: 700 // Names in a mem-initializer-id are looked up in the scope of the 701 // constructor’s class and, if not found in that scope, are looked 702 // up in the scope containing the constructor’s 703 // definition. [Note: if the constructor’s class contains a member 704 // with the same name as a direct or virtual base class of the 705 // class, a mem-initializer-id naming the member or base class and 706 // composed of a single identifier refers to the class member. A 707 // mem-initializer-id for the hidden base class may be specified 708 // using a qualified name. ] 709 if (!SS.getScopeRep() && !TemplateTypeTy) { 710 // Look for a member, first. 711 FieldDecl *Member = 0; 712 DeclContext::lookup_result Result 713 = ClassDecl->lookup(MemberOrBase); 714 if (Result.first != Result.second) 715 Member = dyn_cast<FieldDecl>(*Result.first); 716 717 // FIXME: Handle members of an anonymous union. 718 719 if (Member) { 720 CXXConstructorDecl *C = 0; 721 QualType FieldType = Member->getType(); 722 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 723 FieldType = Array->getElementType(); 724 if (!FieldType->isDependentType() && FieldType->getAsRecordType()) 725 C = PerformInitializationByConstructor( 726 FieldType, (Expr **)Args, NumArgs, IdLoc, 727 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 728 // FIXME: Perform direct initialization of the member. 729 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 730 NumArgs, C, IdLoc); 731 } 732 } 733 // It didn't name a member, so see if it names a class. 734 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 735 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 736 if (!BaseTy) 737 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 738 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 739 740 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 741 if (!BaseType->isRecordType() && !BaseType->isDependentType()) 742 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 743 << BaseType << SourceRange(IdLoc, RParenLoc); 744 745 // C++ [class.base.init]p2: 746 // [...] Unless the mem-initializer-id names a nonstatic data 747 // member of the constructor’s class or a direct or virtual base 748 // of that class, the mem-initializer is ill-formed. A 749 // mem-initializer-list can initialize a base class using any 750 // name that denotes that base class type. 751 752 // First, check for a direct base class. 753 const CXXBaseSpecifier *DirectBaseSpec = 0; 754 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 755 Base != ClassDecl->bases_end(); ++Base) { 756 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 757 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 758 // We found a direct base of this type. That's what we're 759 // initializing. 760 DirectBaseSpec = &*Base; 761 break; 762 } 763 } 764 765 // Check for a virtual base class. 766 // FIXME: We might be able to short-circuit this if we know in advance that 767 // there are no virtual bases. 768 const CXXBaseSpecifier *VirtualBaseSpec = 0; 769 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 770 // We haven't found a base yet; search the class hierarchy for a 771 // virtual base class. 772 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 773 /*DetectVirtual=*/false); 774 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 775 for (BasePaths::paths_iterator Path = Paths.begin(); 776 Path != Paths.end(); ++Path) { 777 if (Path->back().Base->isVirtual()) { 778 VirtualBaseSpec = Path->back().Base; 779 break; 780 } 781 } 782 } 783 } 784 785 // C++ [base.class.init]p2: 786 // If a mem-initializer-id is ambiguous because it designates both 787 // a direct non-virtual base class and an inherited virtual base 788 // class, the mem-initializer is ill-formed. 789 if (DirectBaseSpec && VirtualBaseSpec) 790 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 791 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 792 // C++ [base.class.init]p2: 793 // Unless the mem-initializer-id names a nonstatic data membeer of the 794 // constructor's class ot a direst or virtual base of that class, the 795 // mem-initializer is ill-formed. 796 if (!DirectBaseSpec && !VirtualBaseSpec) 797 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 798 << BaseType << ClassDecl->getNameAsCString() 799 << SourceRange(IdLoc, RParenLoc); 800 DeclarationName Name 801 = Context.DeclarationNames.getCXXConstructorName( 802 Context.getCanonicalType(BaseType)); 803 CXXConstructorDecl *C = 0; 804 if (!BaseType->isDependentType()) 805 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, IdLoc, 806 SourceRange(IdLoc, RParenLoc), Name, 807 IK_Direct); 808 809 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 810 NumArgs, C, IdLoc); 811} 812 813void 814Sema::BuildBaseOrMemberInitializers(ASTContext &C, 815 CXXConstructorDecl *Constructor, 816 CXXBaseOrMemberInitializer **Initializers, 817 unsigned NumInitializers 818 ) { 819 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 820 llvm::SmallVector<FieldDecl *, 4>Members; 821 822 Constructor->setBaseOrMemberInitializers(C, 823 Initializers, NumInitializers, 824 Bases, Members); 825 for (unsigned int i = 0; i < Bases.size(); i++) 826 Diag(Bases[i]->getSourceRange().getBegin(), 827 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 828 for (unsigned int i = 0; i < Members.size(); i++) 829 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 830 << 1 << Members[i]->getType(); 831} 832 833static void *GetKeyForTopLevelField(FieldDecl *Field) { 834 // For anonymous unions, use the class declaration as the key. 835 if (const RecordType *RT = Field->getType()->getAsRecordType()) { 836 if (RT->getDecl()->isAnonymousStructOrUnion()) 837 return static_cast<void *>(RT->getDecl()); 838 } 839 return static_cast<void *>(Field); 840} 841 842static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 843 // For fields injected into the class via declaration of an anonymous union, 844 // use its anonymous union class declaration as the unique key. 845 if (FieldDecl *Field = Member->getMember()) { 846 if (Field->getDeclContext()->isRecord()) { 847 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 848 if (RD->isAnonymousStructOrUnion()) 849 return static_cast<void *>(RD); 850 } 851 return static_cast<void *>(Field); 852 } 853 return static_cast<RecordType *>(Member->getBaseClass()); 854} 855 856void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 857 SourceLocation ColonLoc, 858 MemInitTy **MemInits, unsigned NumMemInits) { 859 if (!ConstructorDecl) 860 return; 861 862 CXXConstructorDecl *Constructor 863 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 864 865 if (!Constructor) { 866 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 867 return; 868 } 869 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 870 bool err = false; 871 for (unsigned i = 0; i < NumMemInits; i++) { 872 CXXBaseOrMemberInitializer *Member = 873 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 874 void *KeyToMember = GetKeyForMember(Member); 875 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 876 if (!PrevMember) { 877 PrevMember = Member; 878 continue; 879 } 880 if (FieldDecl *Field = Member->getMember()) 881 Diag(Member->getSourceLocation(), 882 diag::error_multiple_mem_initialization) 883 << Field->getNameAsString(); 884 else { 885 Type *BaseClass = Member->getBaseClass(); 886 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 887 Diag(Member->getSourceLocation(), 888 diag::error_multiple_base_initialization) 889 << BaseClass->getDesugaredType(true); 890 } 891 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 892 << 0; 893 err = true; 894 } 895 if (!err) 896 BuildBaseOrMemberInitializers(Context, Constructor, 897 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 898 NumMemInits); 899 900 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 901 != Diagnostic::Ignored || 902 Diags.getDiagnosticLevel(diag::warn_field_initialized) 903 != Diagnostic::Ignored)) { 904 // Also issue warning if order of ctor-initializer list does not match order 905 // of 1) base class declarations and 2) order of non-static data members. 906 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 907 908 CXXRecordDecl *ClassDecl 909 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 910 // Push virtual bases before others. 911 for (CXXRecordDecl::base_class_iterator VBase = 912 ClassDecl->vbases_begin(), 913 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 914 AllBaseOrMembers.push_back(VBase->getType()->getAsRecordType()); 915 916 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 917 E = ClassDecl->bases_end(); Base != E; ++Base) { 918 // Virtuals are alread in the virtual base list and are constructed 919 // first. 920 if (Base->isVirtual()) 921 continue; 922 AllBaseOrMembers.push_back(Base->getType()->getAsRecordType()); 923 } 924 925 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 926 E = ClassDecl->field_end(); Field != E; ++Field) 927 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 928 929 int Last = AllBaseOrMembers.size(); 930 int curIndex = 0; 931 CXXBaseOrMemberInitializer *PrevMember = 0; 932 for (unsigned i = 0; i < NumMemInits; i++) { 933 CXXBaseOrMemberInitializer *Member = 934 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 935 void *MemberInCtorList = GetKeyForMember(Member); 936 937 for (; curIndex < Last; curIndex++) 938 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 939 break; 940 if (curIndex == Last) { 941 assert(PrevMember && "Member not in member list?!"); 942 // Initializer as specified in ctor-initializer list is out of order. 943 // Issue a warning diagnostic. 944 if (PrevMember->isBaseInitializer()) { 945 // Diagnostics is for an initialized base class. 946 Type *BaseClass = PrevMember->getBaseClass(); 947 Diag(PrevMember->getSourceLocation(), 948 diag::warn_base_initialized) 949 << BaseClass->getDesugaredType(true); 950 } 951 else { 952 FieldDecl *Field = PrevMember->getMember(); 953 Diag(PrevMember->getSourceLocation(), 954 diag::warn_field_initialized) 955 << Field->getNameAsString(); 956 } 957 // Also the note! 958 if (FieldDecl *Field = Member->getMember()) 959 Diag(Member->getSourceLocation(), 960 diag::note_fieldorbase_initialized_here) << 0 961 << Field->getNameAsString(); 962 else { 963 Type *BaseClass = Member->getBaseClass(); 964 Diag(Member->getSourceLocation(), 965 diag::note_fieldorbase_initialized_here) << 1 966 << BaseClass->getDesugaredType(true); 967 } 968 for (curIndex = 0; curIndex < Last; curIndex++) 969 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 970 break; 971 } 972 PrevMember = Member; 973 } 974 } 975} 976 977void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 978 if (!CDtorDecl) 979 return; 980 981 if (CXXConstructorDecl *Constructor 982 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 983 BuildBaseOrMemberInitializers(Context, 984 Constructor, 985 (CXXBaseOrMemberInitializer **)0, 0); 986} 987 988namespace { 989 /// PureVirtualMethodCollector - traverses a class and its superclasses 990 /// and determines if it has any pure virtual methods. 991 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 992 ASTContext &Context; 993 994 public: 995 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 996 997 private: 998 MethodList Methods; 999 1000 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1001 1002 public: 1003 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1004 : Context(Ctx) { 1005 1006 MethodList List; 1007 Collect(RD, List); 1008 1009 // Copy the temporary list to methods, and make sure to ignore any 1010 // null entries. 1011 for (size_t i = 0, e = List.size(); i != e; ++i) { 1012 if (List[i]) 1013 Methods.push_back(List[i]); 1014 } 1015 } 1016 1017 bool empty() const { return Methods.empty(); } 1018 1019 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1020 MethodList::const_iterator methods_end() { return Methods.end(); } 1021 }; 1022 1023 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1024 MethodList& Methods) { 1025 // First, collect the pure virtual methods for the base classes. 1026 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1027 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1028 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 1029 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1030 if (BaseDecl && BaseDecl->isAbstract()) 1031 Collect(BaseDecl, Methods); 1032 } 1033 } 1034 1035 // Next, zero out any pure virtual methods that this class overrides. 1036 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1037 1038 MethodSetTy OverriddenMethods; 1039 size_t MethodsSize = Methods.size(); 1040 1041 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1042 i != e; ++i) { 1043 // Traverse the record, looking for methods. 1044 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1045 // If the method is pure virtual, add it to the methods vector. 1046 if (MD->isPure()) { 1047 Methods.push_back(MD); 1048 continue; 1049 } 1050 1051 // Otherwise, record all the overridden methods in our set. 1052 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1053 E = MD->end_overridden_methods(); I != E; ++I) { 1054 // Keep track of the overridden methods. 1055 OverriddenMethods.insert(*I); 1056 } 1057 } 1058 } 1059 1060 // Now go through the methods and zero out all the ones we know are 1061 // overridden. 1062 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1063 if (OverriddenMethods.count(Methods[i])) 1064 Methods[i] = 0; 1065 } 1066 1067 } 1068} 1069 1070bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1071 unsigned DiagID, AbstractDiagSelID SelID, 1072 const CXXRecordDecl *CurrentRD) { 1073 1074 if (!getLangOptions().CPlusPlus) 1075 return false; 1076 1077 if (const ArrayType *AT = Context.getAsArrayType(T)) 1078 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1079 CurrentRD); 1080 1081 if (const PointerType *PT = T->getAsPointerType()) { 1082 // Find the innermost pointer type. 1083 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 1084 PT = T; 1085 1086 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1087 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1088 CurrentRD); 1089 } 1090 1091 const RecordType *RT = T->getAsRecordType(); 1092 if (!RT) 1093 return false; 1094 1095 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1096 if (!RD) 1097 return false; 1098 1099 if (CurrentRD && CurrentRD != RD) 1100 return false; 1101 1102 if (!RD->isAbstract()) 1103 return false; 1104 1105 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1106 1107 // Check if we've already emitted the list of pure virtual functions for this 1108 // class. 1109 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1110 return true; 1111 1112 PureVirtualMethodCollector Collector(Context, RD); 1113 1114 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1115 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1116 const CXXMethodDecl *MD = *I; 1117 1118 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1119 MD->getDeclName(); 1120 } 1121 1122 if (!PureVirtualClassDiagSet) 1123 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1124 PureVirtualClassDiagSet->insert(RD); 1125 1126 return true; 1127} 1128 1129namespace { 1130 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1131 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1132 Sema &SemaRef; 1133 CXXRecordDecl *AbstractClass; 1134 1135 bool VisitDeclContext(const DeclContext *DC) { 1136 bool Invalid = false; 1137 1138 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1139 E = DC->decls_end(); I != E; ++I) 1140 Invalid |= Visit(*I); 1141 1142 return Invalid; 1143 } 1144 1145 public: 1146 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1147 : SemaRef(SemaRef), AbstractClass(ac) { 1148 Visit(SemaRef.Context.getTranslationUnitDecl()); 1149 } 1150 1151 bool VisitFunctionDecl(const FunctionDecl *FD) { 1152 if (FD->isThisDeclarationADefinition()) { 1153 // No need to do the check if we're in a definition, because it requires 1154 // that the return/param types are complete. 1155 // because that requires 1156 return VisitDeclContext(FD); 1157 } 1158 1159 // Check the return type. 1160 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1161 bool Invalid = 1162 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1163 diag::err_abstract_type_in_decl, 1164 Sema::AbstractReturnType, 1165 AbstractClass); 1166 1167 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1168 E = FD->param_end(); I != E; ++I) { 1169 const ParmVarDecl *VD = *I; 1170 Invalid |= 1171 SemaRef.RequireNonAbstractType(VD->getLocation(), 1172 VD->getOriginalType(), 1173 diag::err_abstract_type_in_decl, 1174 Sema::AbstractParamType, 1175 AbstractClass); 1176 } 1177 1178 return Invalid; 1179 } 1180 1181 bool VisitDecl(const Decl* D) { 1182 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1183 return VisitDeclContext(DC); 1184 1185 return false; 1186 } 1187 }; 1188} 1189 1190void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1191 DeclPtrTy TagDecl, 1192 SourceLocation LBrac, 1193 SourceLocation RBrac) { 1194 if (!TagDecl) 1195 return; 1196 1197 AdjustDeclIfTemplate(TagDecl); 1198 ActOnFields(S, RLoc, TagDecl, 1199 (DeclPtrTy*)FieldCollector->getCurFields(), 1200 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1201 1202 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1203 if (!RD->isAbstract()) { 1204 // Collect all the pure virtual methods and see if this is an abstract 1205 // class after all. 1206 PureVirtualMethodCollector Collector(Context, RD); 1207 if (!Collector.empty()) 1208 RD->setAbstract(true); 1209 } 1210 1211 if (RD->isAbstract()) 1212 AbstractClassUsageDiagnoser(*this, RD); 1213 1214 if (!RD->isDependentType()) 1215 AddImplicitlyDeclaredMembersToClass(RD); 1216} 1217 1218/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1219/// special functions, such as the default constructor, copy 1220/// constructor, or destructor, to the given C++ class (C++ 1221/// [special]p1). This routine can only be executed just before the 1222/// definition of the class is complete. 1223void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1224 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1225 ClassType = Context.getCanonicalType(ClassType); 1226 1227 // FIXME: Implicit declarations have exception specifications, which are 1228 // the union of the specifications of the implicitly called functions. 1229 1230 if (!ClassDecl->hasUserDeclaredConstructor()) { 1231 // C++ [class.ctor]p5: 1232 // A default constructor for a class X is a constructor of class X 1233 // that can be called without an argument. If there is no 1234 // user-declared constructor for class X, a default constructor is 1235 // implicitly declared. An implicitly-declared default constructor 1236 // is an inline public member of its class. 1237 DeclarationName Name 1238 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1239 CXXConstructorDecl *DefaultCon = 1240 CXXConstructorDecl::Create(Context, ClassDecl, 1241 ClassDecl->getLocation(), Name, 1242 Context.getFunctionType(Context.VoidTy, 1243 0, 0, false, 0), 1244 /*isExplicit=*/false, 1245 /*isInline=*/true, 1246 /*isImplicitlyDeclared=*/true); 1247 DefaultCon->setAccess(AS_public); 1248 DefaultCon->setImplicit(); 1249 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1250 ClassDecl->addDecl(DefaultCon); 1251 } 1252 1253 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1254 // C++ [class.copy]p4: 1255 // If the class definition does not explicitly declare a copy 1256 // constructor, one is declared implicitly. 1257 1258 // C++ [class.copy]p5: 1259 // The implicitly-declared copy constructor for a class X will 1260 // have the form 1261 // 1262 // X::X(const X&) 1263 // 1264 // if 1265 bool HasConstCopyConstructor = true; 1266 1267 // -- each direct or virtual base class B of X has a copy 1268 // constructor whose first parameter is of type const B& or 1269 // const volatile B&, and 1270 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1271 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1272 const CXXRecordDecl *BaseClassDecl 1273 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1274 HasConstCopyConstructor 1275 = BaseClassDecl->hasConstCopyConstructor(Context); 1276 } 1277 1278 // -- for all the nonstatic data members of X that are of a 1279 // class type M (or array thereof), each such class type 1280 // has a copy constructor whose first parameter is of type 1281 // const M& or const volatile M&. 1282 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1283 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1284 ++Field) { 1285 QualType FieldType = (*Field)->getType(); 1286 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1287 FieldType = Array->getElementType(); 1288 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1289 const CXXRecordDecl *FieldClassDecl 1290 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1291 HasConstCopyConstructor 1292 = FieldClassDecl->hasConstCopyConstructor(Context); 1293 } 1294 } 1295 1296 // Otherwise, the implicitly declared copy constructor will have 1297 // the form 1298 // 1299 // X::X(X&) 1300 QualType ArgType = ClassType; 1301 if (HasConstCopyConstructor) 1302 ArgType = ArgType.withConst(); 1303 ArgType = Context.getLValueReferenceType(ArgType); 1304 1305 // An implicitly-declared copy constructor is an inline public 1306 // member of its class. 1307 DeclarationName Name 1308 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1309 CXXConstructorDecl *CopyConstructor 1310 = CXXConstructorDecl::Create(Context, ClassDecl, 1311 ClassDecl->getLocation(), Name, 1312 Context.getFunctionType(Context.VoidTy, 1313 &ArgType, 1, 1314 false, 0), 1315 /*isExplicit=*/false, 1316 /*isInline=*/true, 1317 /*isImplicitlyDeclared=*/true); 1318 CopyConstructor->setAccess(AS_public); 1319 CopyConstructor->setImplicit(); 1320 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1321 1322 // Add the parameter to the constructor. 1323 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1324 ClassDecl->getLocation(), 1325 /*IdentifierInfo=*/0, 1326 ArgType, VarDecl::None, 0); 1327 CopyConstructor->setParams(Context, &FromParam, 1); 1328 ClassDecl->addDecl(CopyConstructor); 1329 } 1330 1331 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1332 // Note: The following rules are largely analoguous to the copy 1333 // constructor rules. Note that virtual bases are not taken into account 1334 // for determining the argument type of the operator. Note also that 1335 // operators taking an object instead of a reference are allowed. 1336 // 1337 // C++ [class.copy]p10: 1338 // If the class definition does not explicitly declare a copy 1339 // assignment operator, one is declared implicitly. 1340 // The implicitly-defined copy assignment operator for a class X 1341 // will have the form 1342 // 1343 // X& X::operator=(const X&) 1344 // 1345 // if 1346 bool HasConstCopyAssignment = true; 1347 1348 // -- each direct base class B of X has a copy assignment operator 1349 // whose parameter is of type const B&, const volatile B& or B, 1350 // and 1351 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1352 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1353 const CXXRecordDecl *BaseClassDecl 1354 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1355 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1356 } 1357 1358 // -- for all the nonstatic data members of X that are of a class 1359 // type M (or array thereof), each such class type has a copy 1360 // assignment operator whose parameter is of type const M&, 1361 // const volatile M& or M. 1362 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1363 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1364 ++Field) { 1365 QualType FieldType = (*Field)->getType(); 1366 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1367 FieldType = Array->getElementType(); 1368 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1369 const CXXRecordDecl *FieldClassDecl 1370 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1371 HasConstCopyAssignment 1372 = FieldClassDecl->hasConstCopyAssignment(Context); 1373 } 1374 } 1375 1376 // Otherwise, the implicitly declared copy assignment operator will 1377 // have the form 1378 // 1379 // X& X::operator=(X&) 1380 QualType ArgType = ClassType; 1381 QualType RetType = Context.getLValueReferenceType(ArgType); 1382 if (HasConstCopyAssignment) 1383 ArgType = ArgType.withConst(); 1384 ArgType = Context.getLValueReferenceType(ArgType); 1385 1386 // An implicitly-declared copy assignment operator is an inline public 1387 // member of its class. 1388 DeclarationName Name = 1389 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1390 CXXMethodDecl *CopyAssignment = 1391 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1392 Context.getFunctionType(RetType, &ArgType, 1, 1393 false, 0), 1394 /*isStatic=*/false, /*isInline=*/true); 1395 CopyAssignment->setAccess(AS_public); 1396 CopyAssignment->setImplicit(); 1397 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1398 1399 // Add the parameter to the operator. 1400 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1401 ClassDecl->getLocation(), 1402 /*IdentifierInfo=*/0, 1403 ArgType, VarDecl::None, 0); 1404 CopyAssignment->setParams(Context, &FromParam, 1); 1405 1406 // Don't call addedAssignmentOperator. There is no way to distinguish an 1407 // implicit from an explicit assignment operator. 1408 ClassDecl->addDecl(CopyAssignment); 1409 } 1410 1411 if (!ClassDecl->hasUserDeclaredDestructor()) { 1412 // C++ [class.dtor]p2: 1413 // If a class has no user-declared destructor, a destructor is 1414 // declared implicitly. An implicitly-declared destructor is an 1415 // inline public member of its class. 1416 DeclarationName Name 1417 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1418 CXXDestructorDecl *Destructor 1419 = CXXDestructorDecl::Create(Context, ClassDecl, 1420 ClassDecl->getLocation(), Name, 1421 Context.getFunctionType(Context.VoidTy, 1422 0, 0, false, 0), 1423 /*isInline=*/true, 1424 /*isImplicitlyDeclared=*/true); 1425 Destructor->setAccess(AS_public); 1426 Destructor->setImplicit(); 1427 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1428 ClassDecl->addDecl(Destructor); 1429 } 1430} 1431 1432void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1433 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1434 if (!Template) 1435 return; 1436 1437 TemplateParameterList *Params = Template->getTemplateParameters(); 1438 for (TemplateParameterList::iterator Param = Params->begin(), 1439 ParamEnd = Params->end(); 1440 Param != ParamEnd; ++Param) { 1441 NamedDecl *Named = cast<NamedDecl>(*Param); 1442 if (Named->getDeclName()) { 1443 S->AddDecl(DeclPtrTy::make(Named)); 1444 IdResolver.AddDecl(Named); 1445 } 1446 } 1447} 1448 1449/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1450/// parsing a top-level (non-nested) C++ class, and we are now 1451/// parsing those parts of the given Method declaration that could 1452/// not be parsed earlier (C++ [class.mem]p2), such as default 1453/// arguments. This action should enter the scope of the given 1454/// Method declaration as if we had just parsed the qualified method 1455/// name. However, it should not bring the parameters into scope; 1456/// that will be performed by ActOnDelayedCXXMethodParameter. 1457void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1458 if (!MethodD) 1459 return; 1460 1461 CXXScopeSpec SS; 1462 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1463 QualType ClassTy 1464 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1465 SS.setScopeRep( 1466 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1467 ActOnCXXEnterDeclaratorScope(S, SS); 1468} 1469 1470/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1471/// C++ method declaration. We're (re-)introducing the given 1472/// function parameter into scope for use in parsing later parts of 1473/// the method declaration. For example, we could see an 1474/// ActOnParamDefaultArgument event for this parameter. 1475void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1476 if (!ParamD) 1477 return; 1478 1479 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1480 1481 // If this parameter has an unparsed default argument, clear it out 1482 // to make way for the parsed default argument. 1483 if (Param->hasUnparsedDefaultArg()) 1484 Param->setDefaultArg(0); 1485 1486 S->AddDecl(DeclPtrTy::make(Param)); 1487 if (Param->getDeclName()) 1488 IdResolver.AddDecl(Param); 1489} 1490 1491/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1492/// processing the delayed method declaration for Method. The method 1493/// declaration is now considered finished. There may be a separate 1494/// ActOnStartOfFunctionDef action later (not necessarily 1495/// immediately!) for this method, if it was also defined inside the 1496/// class body. 1497void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1498 if (!MethodD) 1499 return; 1500 1501 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1502 CXXScopeSpec SS; 1503 QualType ClassTy 1504 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1505 SS.setScopeRep( 1506 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1507 ActOnCXXExitDeclaratorScope(S, SS); 1508 1509 // Now that we have our default arguments, check the constructor 1510 // again. It could produce additional diagnostics or affect whether 1511 // the class has implicitly-declared destructors, among other 1512 // things. 1513 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1514 CheckConstructor(Constructor); 1515 1516 // Check the default arguments, which we may have added. 1517 if (!Method->isInvalidDecl()) 1518 CheckCXXDefaultArguments(Method); 1519} 1520 1521/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1522/// the well-formedness of the constructor declarator @p D with type @p 1523/// R. If there are any errors in the declarator, this routine will 1524/// emit diagnostics and set the invalid bit to true. In any case, the type 1525/// will be updated to reflect a well-formed type for the constructor and 1526/// returned. 1527QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1528 FunctionDecl::StorageClass &SC) { 1529 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1530 1531 // C++ [class.ctor]p3: 1532 // A constructor shall not be virtual (10.3) or static (9.4). A 1533 // constructor can be invoked for a const, volatile or const 1534 // volatile object. A constructor shall not be declared const, 1535 // volatile, or const volatile (9.3.2). 1536 if (isVirtual) { 1537 if (!D.isInvalidType()) 1538 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1539 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1540 << SourceRange(D.getIdentifierLoc()); 1541 D.setInvalidType(); 1542 } 1543 if (SC == FunctionDecl::Static) { 1544 if (!D.isInvalidType()) 1545 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1546 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1547 << SourceRange(D.getIdentifierLoc()); 1548 D.setInvalidType(); 1549 SC = FunctionDecl::None; 1550 } 1551 1552 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1553 if (FTI.TypeQuals != 0) { 1554 if (FTI.TypeQuals & QualType::Const) 1555 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1556 << "const" << SourceRange(D.getIdentifierLoc()); 1557 if (FTI.TypeQuals & QualType::Volatile) 1558 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1559 << "volatile" << SourceRange(D.getIdentifierLoc()); 1560 if (FTI.TypeQuals & QualType::Restrict) 1561 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1562 << "restrict" << SourceRange(D.getIdentifierLoc()); 1563 } 1564 1565 // Rebuild the function type "R" without any type qualifiers (in 1566 // case any of the errors above fired) and with "void" as the 1567 // return type, since constructors don't have return types. We 1568 // *always* have to do this, because GetTypeForDeclarator will 1569 // put in a result type of "int" when none was specified. 1570 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1571 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1572 Proto->getNumArgs(), 1573 Proto->isVariadic(), 0); 1574} 1575 1576/// CheckConstructor - Checks a fully-formed constructor for 1577/// well-formedness, issuing any diagnostics required. Returns true if 1578/// the constructor declarator is invalid. 1579void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1580 CXXRecordDecl *ClassDecl 1581 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1582 if (!ClassDecl) 1583 return Constructor->setInvalidDecl(); 1584 1585 // C++ [class.copy]p3: 1586 // A declaration of a constructor for a class X is ill-formed if 1587 // its first parameter is of type (optionally cv-qualified) X and 1588 // either there are no other parameters or else all other 1589 // parameters have default arguments. 1590 if (!Constructor->isInvalidDecl() && 1591 ((Constructor->getNumParams() == 1) || 1592 (Constructor->getNumParams() > 1 && 1593 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1594 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1595 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1596 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1597 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1598 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1599 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1600 Constructor->setInvalidDecl(); 1601 } 1602 } 1603 1604 // Notify the class that we've added a constructor. 1605 ClassDecl->addedConstructor(Context, Constructor); 1606} 1607 1608static inline bool 1609FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1610 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1611 FTI.ArgInfo[0].Param && 1612 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1613} 1614 1615/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1616/// the well-formednes of the destructor declarator @p D with type @p 1617/// R. If there are any errors in the declarator, this routine will 1618/// emit diagnostics and set the declarator to invalid. Even if this happens, 1619/// will be updated to reflect a well-formed type for the destructor and 1620/// returned. 1621QualType Sema::CheckDestructorDeclarator(Declarator &D, 1622 FunctionDecl::StorageClass& SC) { 1623 // C++ [class.dtor]p1: 1624 // [...] A typedef-name that names a class is a class-name 1625 // (7.1.3); however, a typedef-name that names a class shall not 1626 // be used as the identifier in the declarator for a destructor 1627 // declaration. 1628 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1629 if (isa<TypedefType>(DeclaratorType)) { 1630 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1631 << DeclaratorType; 1632 D.setInvalidType(); 1633 } 1634 1635 // C++ [class.dtor]p2: 1636 // A destructor is used to destroy objects of its class type. A 1637 // destructor takes no parameters, and no return type can be 1638 // specified for it (not even void). The address of a destructor 1639 // shall not be taken. A destructor shall not be static. A 1640 // destructor can be invoked for a const, volatile or const 1641 // volatile object. A destructor shall not be declared const, 1642 // volatile or const volatile (9.3.2). 1643 if (SC == FunctionDecl::Static) { 1644 if (!D.isInvalidType()) 1645 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1646 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1647 << SourceRange(D.getIdentifierLoc()); 1648 SC = FunctionDecl::None; 1649 D.setInvalidType(); 1650 } 1651 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1652 // Destructors don't have return types, but the parser will 1653 // happily parse something like: 1654 // 1655 // class X { 1656 // float ~X(); 1657 // }; 1658 // 1659 // The return type will be eliminated later. 1660 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1661 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1662 << SourceRange(D.getIdentifierLoc()); 1663 } 1664 1665 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1666 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1667 if (FTI.TypeQuals & QualType::Const) 1668 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1669 << "const" << SourceRange(D.getIdentifierLoc()); 1670 if (FTI.TypeQuals & QualType::Volatile) 1671 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1672 << "volatile" << SourceRange(D.getIdentifierLoc()); 1673 if (FTI.TypeQuals & QualType::Restrict) 1674 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1675 << "restrict" << SourceRange(D.getIdentifierLoc()); 1676 D.setInvalidType(); 1677 } 1678 1679 // Make sure we don't have any parameters. 1680 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1681 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1682 1683 // Delete the parameters. 1684 FTI.freeArgs(); 1685 D.setInvalidType(); 1686 } 1687 1688 // Make sure the destructor isn't variadic. 1689 if (FTI.isVariadic) { 1690 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1691 D.setInvalidType(); 1692 } 1693 1694 // Rebuild the function type "R" without any type qualifiers or 1695 // parameters (in case any of the errors above fired) and with 1696 // "void" as the return type, since destructors don't have return 1697 // types. We *always* have to do this, because GetTypeForDeclarator 1698 // will put in a result type of "int" when none was specified. 1699 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1700} 1701 1702/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1703/// well-formednes of the conversion function declarator @p D with 1704/// type @p R. If there are any errors in the declarator, this routine 1705/// will emit diagnostics and return true. Otherwise, it will return 1706/// false. Either way, the type @p R will be updated to reflect a 1707/// well-formed type for the conversion operator. 1708void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1709 FunctionDecl::StorageClass& SC) { 1710 // C++ [class.conv.fct]p1: 1711 // Neither parameter types nor return type can be specified. The 1712 // type of a conversion function (8.3.5) is “function taking no 1713 // parameter returning conversion-type-id.” 1714 if (SC == FunctionDecl::Static) { 1715 if (!D.isInvalidType()) 1716 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1717 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1718 << SourceRange(D.getIdentifierLoc()); 1719 D.setInvalidType(); 1720 SC = FunctionDecl::None; 1721 } 1722 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1723 // Conversion functions don't have return types, but the parser will 1724 // happily parse something like: 1725 // 1726 // class X { 1727 // float operator bool(); 1728 // }; 1729 // 1730 // The return type will be changed later anyway. 1731 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1732 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1733 << SourceRange(D.getIdentifierLoc()); 1734 } 1735 1736 // Make sure we don't have any parameters. 1737 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1738 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1739 1740 // Delete the parameters. 1741 D.getTypeObject(0).Fun.freeArgs(); 1742 D.setInvalidType(); 1743 } 1744 1745 // Make sure the conversion function isn't variadic. 1746 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1747 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1748 D.setInvalidType(); 1749 } 1750 1751 // C++ [class.conv.fct]p4: 1752 // The conversion-type-id shall not represent a function type nor 1753 // an array type. 1754 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1755 if (ConvType->isArrayType()) { 1756 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1757 ConvType = Context.getPointerType(ConvType); 1758 D.setInvalidType(); 1759 } else if (ConvType->isFunctionType()) { 1760 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1761 ConvType = Context.getPointerType(ConvType); 1762 D.setInvalidType(); 1763 } 1764 1765 // Rebuild the function type "R" without any parameters (in case any 1766 // of the errors above fired) and with the conversion type as the 1767 // return type. 1768 R = Context.getFunctionType(ConvType, 0, 0, false, 1769 R->getAsFunctionProtoType()->getTypeQuals()); 1770 1771 // C++0x explicit conversion operators. 1772 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1773 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1774 diag::warn_explicit_conversion_functions) 1775 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1776} 1777 1778/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1779/// the declaration of the given C++ conversion function. This routine 1780/// is responsible for recording the conversion function in the C++ 1781/// class, if possible. 1782Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1783 assert(Conversion && "Expected to receive a conversion function declaration"); 1784 1785 // Set the lexical context of this conversion function 1786 Conversion->setLexicalDeclContext(CurContext); 1787 1788 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1789 1790 // Make sure we aren't redeclaring the conversion function. 1791 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1792 1793 // C++ [class.conv.fct]p1: 1794 // [...] A conversion function is never used to convert a 1795 // (possibly cv-qualified) object to the (possibly cv-qualified) 1796 // same object type (or a reference to it), to a (possibly 1797 // cv-qualified) base class of that type (or a reference to it), 1798 // or to (possibly cv-qualified) void. 1799 // FIXME: Suppress this warning if the conversion function ends up being a 1800 // virtual function that overrides a virtual function in a base class. 1801 QualType ClassType 1802 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1803 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1804 ConvType = ConvTypeRef->getPointeeType(); 1805 if (ConvType->isRecordType()) { 1806 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1807 if (ConvType == ClassType) 1808 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1809 << ClassType; 1810 else if (IsDerivedFrom(ClassType, ConvType)) 1811 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1812 << ClassType << ConvType; 1813 } else if (ConvType->isVoidType()) { 1814 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1815 << ClassType << ConvType; 1816 } 1817 1818 if (Conversion->getPreviousDeclaration()) { 1819 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1820 for (OverloadedFunctionDecl::function_iterator 1821 Conv = Conversions->function_begin(), 1822 ConvEnd = Conversions->function_end(); 1823 Conv != ConvEnd; ++Conv) { 1824 if (*Conv 1825 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1826 *Conv = Conversion; 1827 return DeclPtrTy::make(Conversion); 1828 } 1829 } 1830 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1831 } else 1832 ClassDecl->addConversionFunction(Context, Conversion); 1833 1834 return DeclPtrTy::make(Conversion); 1835} 1836 1837//===----------------------------------------------------------------------===// 1838// Namespace Handling 1839//===----------------------------------------------------------------------===// 1840 1841/// ActOnStartNamespaceDef - This is called at the start of a namespace 1842/// definition. 1843Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1844 SourceLocation IdentLoc, 1845 IdentifierInfo *II, 1846 SourceLocation LBrace) { 1847 NamespaceDecl *Namespc = 1848 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1849 Namespc->setLBracLoc(LBrace); 1850 1851 Scope *DeclRegionScope = NamespcScope->getParent(); 1852 1853 if (II) { 1854 // C++ [namespace.def]p2: 1855 // The identifier in an original-namespace-definition shall not have been 1856 // previously defined in the declarative region in which the 1857 // original-namespace-definition appears. The identifier in an 1858 // original-namespace-definition is the name of the namespace. Subsequently 1859 // in that declarative region, it is treated as an original-namespace-name. 1860 1861 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1862 true); 1863 1864 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1865 // This is an extended namespace definition. 1866 // Attach this namespace decl to the chain of extended namespace 1867 // definitions. 1868 OrigNS->setNextNamespace(Namespc); 1869 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1870 1871 // Remove the previous declaration from the scope. 1872 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1873 IdResolver.RemoveDecl(OrigNS); 1874 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1875 } 1876 } else if (PrevDecl) { 1877 // This is an invalid name redefinition. 1878 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1879 << Namespc->getDeclName(); 1880 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1881 Namespc->setInvalidDecl(); 1882 // Continue on to push Namespc as current DeclContext and return it. 1883 } 1884 1885 PushOnScopeChains(Namespc, DeclRegionScope); 1886 } else { 1887 // FIXME: Handle anonymous namespaces 1888 } 1889 1890 // Although we could have an invalid decl (i.e. the namespace name is a 1891 // redefinition), push it as current DeclContext and try to continue parsing. 1892 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1893 // for the namespace has the declarations that showed up in that particular 1894 // namespace definition. 1895 PushDeclContext(NamespcScope, Namespc); 1896 return DeclPtrTy::make(Namespc); 1897} 1898 1899/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1900/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1901void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1902 Decl *Dcl = D.getAs<Decl>(); 1903 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1904 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1905 Namespc->setRBracLoc(RBrace); 1906 PopDeclContext(); 1907} 1908 1909Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1910 SourceLocation UsingLoc, 1911 SourceLocation NamespcLoc, 1912 const CXXScopeSpec &SS, 1913 SourceLocation IdentLoc, 1914 IdentifierInfo *NamespcName, 1915 AttributeList *AttrList) { 1916 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1917 assert(NamespcName && "Invalid NamespcName."); 1918 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1919 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1920 1921 UsingDirectiveDecl *UDir = 0; 1922 1923 // Lookup namespace name. 1924 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1925 LookupNamespaceName, false); 1926 if (R.isAmbiguous()) { 1927 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1928 return DeclPtrTy(); 1929 } 1930 if (NamedDecl *NS = R) { 1931 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1932 // C++ [namespace.udir]p1: 1933 // A using-directive specifies that the names in the nominated 1934 // namespace can be used in the scope in which the 1935 // using-directive appears after the using-directive. During 1936 // unqualified name lookup (3.4.1), the names appear as if they 1937 // were declared in the nearest enclosing namespace which 1938 // contains both the using-directive and the nominated 1939 // namespace. [Note: in this context, “contains” means “contains 1940 // directly or indirectly”. ] 1941 1942 // Find enclosing context containing both using-directive and 1943 // nominated namespace. 1944 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1945 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1946 CommonAncestor = CommonAncestor->getParent(); 1947 1948 UDir = UsingDirectiveDecl::Create(Context, 1949 CurContext, UsingLoc, 1950 NamespcLoc, 1951 SS.getRange(), 1952 (NestedNameSpecifier *)SS.getScopeRep(), 1953 IdentLoc, 1954 cast<NamespaceDecl>(NS), 1955 CommonAncestor); 1956 PushUsingDirective(S, UDir); 1957 } else { 1958 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1959 } 1960 1961 // FIXME: We ignore attributes for now. 1962 delete AttrList; 1963 return DeclPtrTy::make(UDir); 1964} 1965 1966void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1967 // If scope has associated entity, then using directive is at namespace 1968 // or translation unit scope. We add UsingDirectiveDecls, into 1969 // it's lookup structure. 1970 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1971 Ctx->addDecl(UDir); 1972 else 1973 // Otherwise it is block-sope. using-directives will affect lookup 1974 // only to the end of scope. 1975 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1976} 1977 1978 1979Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1980 SourceLocation UsingLoc, 1981 const CXXScopeSpec &SS, 1982 SourceLocation IdentLoc, 1983 IdentifierInfo *TargetName, 1984 OverloadedOperatorKind Op, 1985 AttributeList *AttrList, 1986 bool IsTypeName) { 1987 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1988 assert((TargetName || Op) && "Invalid TargetName."); 1989 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1990 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1991 1992 UsingDecl *UsingAlias = 0; 1993 1994 DeclarationName Name; 1995 if (TargetName) 1996 Name = TargetName; 1997 else 1998 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1999 2000 // Lookup target name. 2001 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2002 2003 if (NamedDecl *NS = R) { 2004 if (IsTypeName && !isa<TypeDecl>(NS)) { 2005 Diag(IdentLoc, diag::err_using_typename_non_type); 2006 } 2007 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2008 NS->getLocation(), UsingLoc, NS, 2009 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2010 IsTypeName); 2011 PushOnScopeChains(UsingAlias, S); 2012 } else { 2013 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2014 } 2015 2016 // FIXME: We ignore attributes for now. 2017 delete AttrList; 2018 return DeclPtrTy::make(UsingAlias); 2019} 2020 2021/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2022/// is a namespace alias, returns the namespace it points to. 2023static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2024 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2025 return AD->getNamespace(); 2026 return dyn_cast_or_null<NamespaceDecl>(D); 2027} 2028 2029Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2030 SourceLocation NamespaceLoc, 2031 SourceLocation AliasLoc, 2032 IdentifierInfo *Alias, 2033 const CXXScopeSpec &SS, 2034 SourceLocation IdentLoc, 2035 IdentifierInfo *Ident) { 2036 2037 // Lookup the namespace name. 2038 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2039 2040 // Check if we have a previous declaration with the same name. 2041 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2042 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2043 // We already have an alias with the same name that points to the same 2044 // namespace, so don't create a new one. 2045 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2046 return DeclPtrTy(); 2047 } 2048 2049 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2050 diag::err_redefinition_different_kind; 2051 Diag(AliasLoc, DiagID) << Alias; 2052 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2053 return DeclPtrTy(); 2054 } 2055 2056 if (R.isAmbiguous()) { 2057 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2058 return DeclPtrTy(); 2059 } 2060 2061 if (!R) { 2062 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2063 return DeclPtrTy(); 2064 } 2065 2066 NamespaceAliasDecl *AliasDecl = 2067 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2068 Alias, SS.getRange(), 2069 (NestedNameSpecifier *)SS.getScopeRep(), 2070 IdentLoc, R); 2071 2072 CurContext->addDecl(AliasDecl); 2073 return DeclPtrTy::make(AliasDecl); 2074} 2075 2076void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2077 CXXConstructorDecl *Constructor) { 2078 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2079 !Constructor->isUsed()) && 2080 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2081 2082 CXXRecordDecl *ClassDecl 2083 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2084 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2085 // Before the implicitly-declared default constructor for a class is 2086 // implicitly defined, all the implicitly-declared default constructors 2087 // for its base class and its non-static data members shall have been 2088 // implicitly defined. 2089 bool err = false; 2090 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2091 E = ClassDecl->bases_end(); Base != E; ++Base) { 2092 CXXRecordDecl *BaseClassDecl 2093 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2094 if (!BaseClassDecl->hasTrivialConstructor()) { 2095 if (CXXConstructorDecl *BaseCtor = 2096 BaseClassDecl->getDefaultConstructor(Context)) 2097 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2098 else { 2099 Diag(CurrentLocation, diag::err_defining_default_ctor) 2100 << Context.getTagDeclType(ClassDecl) << 1 2101 << Context.getTagDeclType(BaseClassDecl); 2102 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2103 << Context.getTagDeclType(BaseClassDecl); 2104 err = true; 2105 } 2106 } 2107 } 2108 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2109 E = ClassDecl->field_end(); Field != E; ++Field) { 2110 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2111 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2112 FieldType = Array->getElementType(); 2113 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2114 CXXRecordDecl *FieldClassDecl 2115 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2116 if (!FieldClassDecl->hasTrivialConstructor()) { 2117 if (CXXConstructorDecl *FieldCtor = 2118 FieldClassDecl->getDefaultConstructor(Context)) 2119 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2120 else { 2121 Diag(CurrentLocation, diag::err_defining_default_ctor) 2122 << Context.getTagDeclType(ClassDecl) << 0 << 2123 Context.getTagDeclType(FieldClassDecl); 2124 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2125 << Context.getTagDeclType(FieldClassDecl); 2126 err = true; 2127 } 2128 } 2129 } 2130 else if (FieldType->isReferenceType()) { 2131 Diag(CurrentLocation, diag::err_unintialized_member) 2132 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2133 Diag((*Field)->getLocation(), diag::note_declared_at); 2134 err = true; 2135 } 2136 else if (FieldType.isConstQualified()) { 2137 Diag(CurrentLocation, diag::err_unintialized_member) 2138 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2139 Diag((*Field)->getLocation(), diag::note_declared_at); 2140 err = true; 2141 } 2142 } 2143 if (!err) 2144 Constructor->setUsed(); 2145 else 2146 Constructor->setInvalidDecl(); 2147} 2148 2149void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2150 CXXDestructorDecl *Destructor) { 2151 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2152 "DefineImplicitDestructor - call it for implicit default dtor"); 2153 2154 CXXRecordDecl *ClassDecl 2155 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2156 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2157 // C++ [class.dtor] p5 2158 // Before the implicitly-declared default destructor for a class is 2159 // implicitly defined, all the implicitly-declared default destructors 2160 // for its base class and its non-static data members shall have been 2161 // implicitly defined. 2162 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2163 E = ClassDecl->bases_end(); Base != E; ++Base) { 2164 CXXRecordDecl *BaseClassDecl 2165 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2166 if (!BaseClassDecl->hasTrivialDestructor()) { 2167 if (CXXDestructorDecl *BaseDtor = 2168 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2169 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2170 else 2171 assert(false && 2172 "DefineImplicitDestructor - missing dtor in a base class"); 2173 } 2174 } 2175 2176 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2177 E = ClassDecl->field_end(); Field != E; ++Field) { 2178 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2179 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2180 FieldType = Array->getElementType(); 2181 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2182 CXXRecordDecl *FieldClassDecl 2183 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2184 if (!FieldClassDecl->hasTrivialDestructor()) { 2185 if (CXXDestructorDecl *FieldDtor = 2186 const_cast<CXXDestructorDecl*>( 2187 FieldClassDecl->getDestructor(Context))) 2188 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2189 else 2190 assert(false && 2191 "DefineImplicitDestructor - missing dtor in class of a data member"); 2192 } 2193 } 2194 } 2195 Destructor->setUsed(); 2196} 2197 2198void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2199 CXXMethodDecl *MethodDecl) { 2200 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2201 MethodDecl->getOverloadedOperator() == OO_Equal && 2202 !MethodDecl->isUsed()) && 2203 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2204 2205 CXXRecordDecl *ClassDecl 2206 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2207 2208 // C++[class.copy] p12 2209 // Before the implicitly-declared copy assignment operator for a class is 2210 // implicitly defined, all implicitly-declared copy assignment operators 2211 // for its direct base classes and its nonstatic data members shall have 2212 // been implicitly defined. 2213 bool err = false; 2214 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2215 E = ClassDecl->bases_end(); Base != E; ++Base) { 2216 CXXRecordDecl *BaseClassDecl 2217 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2218 if (CXXMethodDecl *BaseAssignOpMethod = 2219 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2220 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2221 } 2222 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2223 E = ClassDecl->field_end(); Field != E; ++Field) { 2224 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2225 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2226 FieldType = Array->getElementType(); 2227 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2228 CXXRecordDecl *FieldClassDecl 2229 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2230 if (CXXMethodDecl *FieldAssignOpMethod = 2231 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2232 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2233 } 2234 else if (FieldType->isReferenceType()) { 2235 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2236 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2237 Diag(Field->getLocation(), diag::note_declared_at); 2238 Diag(CurrentLocation, diag::note_first_required_here); 2239 err = true; 2240 } 2241 else if (FieldType.isConstQualified()) { 2242 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2243 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2244 Diag(Field->getLocation(), diag::note_declared_at); 2245 Diag(CurrentLocation, diag::note_first_required_here); 2246 err = true; 2247 } 2248 } 2249 if (!err) 2250 MethodDecl->setUsed(); 2251} 2252 2253CXXMethodDecl * 2254Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2255 CXXRecordDecl *ClassDecl) { 2256 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2257 QualType RHSType(LHSType); 2258 // If class's assignment operator argument is const/volatile qualified, 2259 // look for operator = (const/volatile B&). Otherwise, look for 2260 // operator = (B&). 2261 if (ParmDecl->getType().isConstQualified()) 2262 RHSType.addConst(); 2263 if (ParmDecl->getType().isVolatileQualified()) 2264 RHSType.addVolatile(); 2265 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2266 LHSType, 2267 SourceLocation())); 2268 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2269 RHSType, 2270 SourceLocation())); 2271 Expr *Args[2] = { &*LHS, &*RHS }; 2272 OverloadCandidateSet CandidateSet; 2273 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2274 CandidateSet); 2275 OverloadCandidateSet::iterator Best; 2276 if (BestViableFunction(CandidateSet, 2277 ClassDecl->getLocation(), Best) == OR_Success) 2278 return cast<CXXMethodDecl>(Best->Function); 2279 assert(false && 2280 "getAssignOperatorMethod - copy assignment operator method not found"); 2281 return 0; 2282} 2283 2284void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2285 CXXConstructorDecl *CopyConstructor, 2286 unsigned TypeQuals) { 2287 assert((CopyConstructor->isImplicit() && 2288 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2289 !CopyConstructor->isUsed()) && 2290 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2291 2292 CXXRecordDecl *ClassDecl 2293 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2294 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2295 // C++ [class.copy] p209 2296 // Before the implicitly-declared copy constructor for a class is 2297 // implicitly defined, all the implicitly-declared copy constructors 2298 // for its base class and its non-static data members shall have been 2299 // implicitly defined. 2300 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2301 Base != ClassDecl->bases_end(); ++Base) { 2302 CXXRecordDecl *BaseClassDecl 2303 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2304 if (CXXConstructorDecl *BaseCopyCtor = 2305 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2306 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2307 } 2308 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2309 FieldEnd = ClassDecl->field_end(); 2310 Field != FieldEnd; ++Field) { 2311 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2312 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2313 FieldType = Array->getElementType(); 2314 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2315 CXXRecordDecl *FieldClassDecl 2316 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2317 if (CXXConstructorDecl *FieldCopyCtor = 2318 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2319 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2320 } 2321 } 2322 CopyConstructor->setUsed(); 2323} 2324 2325void Sema::InitializeVarWithConstructor(VarDecl *VD, 2326 CXXConstructorDecl *Constructor, 2327 QualType DeclInitType, 2328 Expr **Exprs, unsigned NumExprs) { 2329 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2330 false, Exprs, NumExprs); 2331 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2332 VD->setInit(Context, Temp); 2333} 2334 2335void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2336{ 2337 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2338 DeclInitType->getAsRecordType()->getDecl()); 2339 if (!ClassDecl->hasTrivialDestructor()) 2340 if (CXXDestructorDecl *Destructor = 2341 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2342 MarkDeclarationReferenced(Loc, Destructor); 2343} 2344 2345/// AddCXXDirectInitializerToDecl - This action is called immediately after 2346/// ActOnDeclarator, when a C++ direct initializer is present. 2347/// e.g: "int x(1);" 2348void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2349 SourceLocation LParenLoc, 2350 MultiExprArg Exprs, 2351 SourceLocation *CommaLocs, 2352 SourceLocation RParenLoc) { 2353 unsigned NumExprs = Exprs.size(); 2354 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2355 Decl *RealDecl = Dcl.getAs<Decl>(); 2356 2357 // If there is no declaration, there was an error parsing it. Just ignore 2358 // the initializer. 2359 if (RealDecl == 0) 2360 return; 2361 2362 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2363 if (!VDecl) { 2364 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2365 RealDecl->setInvalidDecl(); 2366 return; 2367 } 2368 2369 // FIXME: Need to handle dependent types and expressions here. 2370 2371 // We will treat direct-initialization as a copy-initialization: 2372 // int x(1); -as-> int x = 1; 2373 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2374 // 2375 // Clients that want to distinguish between the two forms, can check for 2376 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2377 // A major benefit is that clients that don't particularly care about which 2378 // exactly form was it (like the CodeGen) can handle both cases without 2379 // special case code. 2380 2381 // C++ 8.5p11: 2382 // The form of initialization (using parentheses or '=') is generally 2383 // insignificant, but does matter when the entity being initialized has a 2384 // class type. 2385 QualType DeclInitType = VDecl->getType(); 2386 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2387 DeclInitType = Array->getElementType(); 2388 2389 // FIXME: This isn't the right place to complete the type. 2390 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2391 diag::err_typecheck_decl_incomplete_type)) { 2392 VDecl->setInvalidDecl(); 2393 return; 2394 } 2395 2396 if (VDecl->getType()->isRecordType()) { 2397 CXXConstructorDecl *Constructor 2398 = PerformInitializationByConstructor(DeclInitType, 2399 (Expr **)Exprs.get(), NumExprs, 2400 VDecl->getLocation(), 2401 SourceRange(VDecl->getLocation(), 2402 RParenLoc), 2403 VDecl->getDeclName(), 2404 IK_Direct); 2405 if (!Constructor) 2406 RealDecl->setInvalidDecl(); 2407 else { 2408 VDecl->setCXXDirectInitializer(true); 2409 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2410 (Expr**)Exprs.release(), NumExprs); 2411 // FIXME. Must do all that is needed to destroy the object 2412 // on scope exit. For now, just mark the destructor as used. 2413 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2414 } 2415 return; 2416 } 2417 2418 if (NumExprs > 1) { 2419 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2420 << SourceRange(VDecl->getLocation(), RParenLoc); 2421 RealDecl->setInvalidDecl(); 2422 return; 2423 } 2424 2425 // Let clients know that initialization was done with a direct initializer. 2426 VDecl->setCXXDirectInitializer(true); 2427 2428 assert(NumExprs == 1 && "Expected 1 expression"); 2429 // Set the init expression, handles conversions. 2430 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2431 /*DirectInit=*/true); 2432} 2433 2434/// PerformInitializationByConstructor - Perform initialization by 2435/// constructor (C++ [dcl.init]p14), which may occur as part of 2436/// direct-initialization or copy-initialization. We are initializing 2437/// an object of type @p ClassType with the given arguments @p 2438/// Args. @p Loc is the location in the source code where the 2439/// initializer occurs (e.g., a declaration, member initializer, 2440/// functional cast, etc.) while @p Range covers the whole 2441/// initialization. @p InitEntity is the entity being initialized, 2442/// which may by the name of a declaration or a type. @p Kind is the 2443/// kind of initialization we're performing, which affects whether 2444/// explicit constructors will be considered. When successful, returns 2445/// the constructor that will be used to perform the initialization; 2446/// when the initialization fails, emits a diagnostic and returns 2447/// null. 2448CXXConstructorDecl * 2449Sema::PerformInitializationByConstructor(QualType ClassType, 2450 Expr **Args, unsigned NumArgs, 2451 SourceLocation Loc, SourceRange Range, 2452 DeclarationName InitEntity, 2453 InitializationKind Kind) { 2454 const RecordType *ClassRec = ClassType->getAsRecordType(); 2455 assert(ClassRec && "Can only initialize a class type here"); 2456 2457 // C++ [dcl.init]p14: 2458 // 2459 // If the initialization is direct-initialization, or if it is 2460 // copy-initialization where the cv-unqualified version of the 2461 // source type is the same class as, or a derived class of, the 2462 // class of the destination, constructors are considered. The 2463 // applicable constructors are enumerated (13.3.1.3), and the 2464 // best one is chosen through overload resolution (13.3). The 2465 // constructor so selected is called to initialize the object, 2466 // with the initializer expression(s) as its argument(s). If no 2467 // constructor applies, or the overload resolution is ambiguous, 2468 // the initialization is ill-formed. 2469 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2470 OverloadCandidateSet CandidateSet; 2471 2472 // Add constructors to the overload set. 2473 DeclarationName ConstructorName 2474 = Context.DeclarationNames.getCXXConstructorName( 2475 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2476 DeclContext::lookup_const_iterator Con, ConEnd; 2477 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2478 Con != ConEnd; ++Con) { 2479 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2480 if ((Kind == IK_Direct) || 2481 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2482 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2483 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2484 } 2485 2486 // FIXME: When we decide not to synthesize the implicitly-declared 2487 // constructors, we'll need to make them appear here. 2488 2489 OverloadCandidateSet::iterator Best; 2490 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2491 case OR_Success: 2492 // We found a constructor. Return it. 2493 return cast<CXXConstructorDecl>(Best->Function); 2494 2495 case OR_No_Viable_Function: 2496 if (InitEntity) 2497 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2498 << InitEntity << Range; 2499 else 2500 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2501 << ClassType << Range; 2502 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2503 return 0; 2504 2505 case OR_Ambiguous: 2506 if (InitEntity) 2507 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2508 else 2509 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2510 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2511 return 0; 2512 2513 case OR_Deleted: 2514 if (InitEntity) 2515 Diag(Loc, diag::err_ovl_deleted_init) 2516 << Best->Function->isDeleted() 2517 << InitEntity << Range; 2518 else 2519 Diag(Loc, diag::err_ovl_deleted_init) 2520 << Best->Function->isDeleted() 2521 << InitEntity << Range; 2522 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2523 return 0; 2524 } 2525 2526 return 0; 2527} 2528 2529/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2530/// determine whether they are reference-related, 2531/// reference-compatible, reference-compatible with added 2532/// qualification, or incompatible, for use in C++ initialization by 2533/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2534/// type, and the first type (T1) is the pointee type of the reference 2535/// type being initialized. 2536Sema::ReferenceCompareResult 2537Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2538 bool& DerivedToBase) { 2539 assert(!T1->isReferenceType() && 2540 "T1 must be the pointee type of the reference type"); 2541 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2542 2543 T1 = Context.getCanonicalType(T1); 2544 T2 = Context.getCanonicalType(T2); 2545 QualType UnqualT1 = T1.getUnqualifiedType(); 2546 QualType UnqualT2 = T2.getUnqualifiedType(); 2547 2548 // C++ [dcl.init.ref]p4: 2549 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2550 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2551 // T1 is a base class of T2. 2552 if (UnqualT1 == UnqualT2) 2553 DerivedToBase = false; 2554 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2555 DerivedToBase = true; 2556 else 2557 return Ref_Incompatible; 2558 2559 // At this point, we know that T1 and T2 are reference-related (at 2560 // least). 2561 2562 // C++ [dcl.init.ref]p4: 2563 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2564 // reference-related to T2 and cv1 is the same cv-qualification 2565 // as, or greater cv-qualification than, cv2. For purposes of 2566 // overload resolution, cases for which cv1 is greater 2567 // cv-qualification than cv2 are identified as 2568 // reference-compatible with added qualification (see 13.3.3.2). 2569 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2570 return Ref_Compatible; 2571 else if (T1.isMoreQualifiedThan(T2)) 2572 return Ref_Compatible_With_Added_Qualification; 2573 else 2574 return Ref_Related; 2575} 2576 2577/// CheckReferenceInit - Check the initialization of a reference 2578/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2579/// the initializer (either a simple initializer or an initializer 2580/// list), and DeclType is the type of the declaration. When ICS is 2581/// non-null, this routine will compute the implicit conversion 2582/// sequence according to C++ [over.ics.ref] and will not produce any 2583/// diagnostics; when ICS is null, it will emit diagnostics when any 2584/// errors are found. Either way, a return value of true indicates 2585/// that there was a failure, a return value of false indicates that 2586/// the reference initialization succeeded. 2587/// 2588/// When @p SuppressUserConversions, user-defined conversions are 2589/// suppressed. 2590/// When @p AllowExplicit, we also permit explicit user-defined 2591/// conversion functions. 2592/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2593bool 2594Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2595 ImplicitConversionSequence *ICS, 2596 bool SuppressUserConversions, 2597 bool AllowExplicit, bool ForceRValue) { 2598 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2599 2600 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2601 QualType T2 = Init->getType(); 2602 2603 // If the initializer is the address of an overloaded function, try 2604 // to resolve the overloaded function. If all goes well, T2 is the 2605 // type of the resulting function. 2606 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2607 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2608 ICS != 0); 2609 if (Fn) { 2610 // Since we're performing this reference-initialization for 2611 // real, update the initializer with the resulting function. 2612 if (!ICS) { 2613 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2614 return true; 2615 2616 FixOverloadedFunctionReference(Init, Fn); 2617 } 2618 2619 T2 = Fn->getType(); 2620 } 2621 } 2622 2623 // Compute some basic properties of the types and the initializer. 2624 bool isRValRef = DeclType->isRValueReferenceType(); 2625 bool DerivedToBase = false; 2626 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2627 Init->isLvalue(Context); 2628 ReferenceCompareResult RefRelationship 2629 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2630 2631 // Most paths end in a failed conversion. 2632 if (ICS) 2633 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2634 2635 // C++ [dcl.init.ref]p5: 2636 // A reference to type “cv1 T1” is initialized by an expression 2637 // of type “cv2 T2” as follows: 2638 2639 // -- If the initializer expression 2640 2641 // Rvalue references cannot bind to lvalues (N2812). 2642 // There is absolutely no situation where they can. In particular, note that 2643 // this is ill-formed, even if B has a user-defined conversion to A&&: 2644 // B b; 2645 // A&& r = b; 2646 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2647 if (!ICS) 2648 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2649 << Init->getSourceRange(); 2650 return true; 2651 } 2652 2653 bool BindsDirectly = false; 2654 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2655 // reference-compatible with “cv2 T2,” or 2656 // 2657 // Note that the bit-field check is skipped if we are just computing 2658 // the implicit conversion sequence (C++ [over.best.ics]p2). 2659 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2660 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2661 BindsDirectly = true; 2662 2663 if (ICS) { 2664 // C++ [over.ics.ref]p1: 2665 // When a parameter of reference type binds directly (8.5.3) 2666 // to an argument expression, the implicit conversion sequence 2667 // is the identity conversion, unless the argument expression 2668 // has a type that is a derived class of the parameter type, 2669 // in which case the implicit conversion sequence is a 2670 // derived-to-base Conversion (13.3.3.1). 2671 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2672 ICS->Standard.First = ICK_Identity; 2673 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2674 ICS->Standard.Third = ICK_Identity; 2675 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2676 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2677 ICS->Standard.ReferenceBinding = true; 2678 ICS->Standard.DirectBinding = true; 2679 ICS->Standard.RRefBinding = false; 2680 ICS->Standard.CopyConstructor = 0; 2681 2682 // Nothing more to do: the inaccessibility/ambiguity check for 2683 // derived-to-base conversions is suppressed when we're 2684 // computing the implicit conversion sequence (C++ 2685 // [over.best.ics]p2). 2686 return false; 2687 } else { 2688 // Perform the conversion. 2689 // FIXME: Binding to a subobject of the lvalue is going to require more 2690 // AST annotation than this. 2691 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2692 } 2693 } 2694 2695 // -- has a class type (i.e., T2 is a class type) and can be 2696 // implicitly converted to an lvalue of type “cv3 T3,” 2697 // where “cv1 T1” is reference-compatible with “cv3 T3” 2698 // 92) (this conversion is selected by enumerating the 2699 // applicable conversion functions (13.3.1.6) and choosing 2700 // the best one through overload resolution (13.3)), 2701 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2702 // FIXME: Look for conversions in base classes! 2703 CXXRecordDecl *T2RecordDecl 2704 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2705 2706 OverloadCandidateSet CandidateSet; 2707 OverloadedFunctionDecl *Conversions 2708 = T2RecordDecl->getConversionFunctions(); 2709 for (OverloadedFunctionDecl::function_iterator Func 2710 = Conversions->function_begin(); 2711 Func != Conversions->function_end(); ++Func) { 2712 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2713 2714 // If the conversion function doesn't return a reference type, 2715 // it can't be considered for this conversion. 2716 if (Conv->getConversionType()->isLValueReferenceType() && 2717 (AllowExplicit || !Conv->isExplicit())) 2718 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2719 } 2720 2721 OverloadCandidateSet::iterator Best; 2722 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2723 case OR_Success: 2724 // This is a direct binding. 2725 BindsDirectly = true; 2726 2727 if (ICS) { 2728 // C++ [over.ics.ref]p1: 2729 // 2730 // [...] If the parameter binds directly to the result of 2731 // applying a conversion function to the argument 2732 // expression, the implicit conversion sequence is a 2733 // user-defined conversion sequence (13.3.3.1.2), with the 2734 // second standard conversion sequence either an identity 2735 // conversion or, if the conversion function returns an 2736 // entity of a type that is a derived class of the parameter 2737 // type, a derived-to-base Conversion. 2738 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2739 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2740 ICS->UserDefined.After = Best->FinalConversion; 2741 ICS->UserDefined.ConversionFunction = Best->Function; 2742 assert(ICS->UserDefined.After.ReferenceBinding && 2743 ICS->UserDefined.After.DirectBinding && 2744 "Expected a direct reference binding!"); 2745 return false; 2746 } else { 2747 // Perform the conversion. 2748 // FIXME: Binding to a subobject of the lvalue is going to require more 2749 // AST annotation than this. 2750 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2751 } 2752 break; 2753 2754 case OR_Ambiguous: 2755 assert(false && "Ambiguous reference binding conversions not implemented."); 2756 return true; 2757 2758 case OR_No_Viable_Function: 2759 case OR_Deleted: 2760 // There was no suitable conversion, or we found a deleted 2761 // conversion; continue with other checks. 2762 break; 2763 } 2764 } 2765 2766 if (BindsDirectly) { 2767 // C++ [dcl.init.ref]p4: 2768 // [...] In all cases where the reference-related or 2769 // reference-compatible relationship of two types is used to 2770 // establish the validity of a reference binding, and T1 is a 2771 // base class of T2, a program that necessitates such a binding 2772 // is ill-formed if T1 is an inaccessible (clause 11) or 2773 // ambiguous (10.2) base class of T2. 2774 // 2775 // Note that we only check this condition when we're allowed to 2776 // complain about errors, because we should not be checking for 2777 // ambiguity (or inaccessibility) unless the reference binding 2778 // actually happens. 2779 if (DerivedToBase) 2780 return CheckDerivedToBaseConversion(T2, T1, 2781 Init->getSourceRange().getBegin(), 2782 Init->getSourceRange()); 2783 else 2784 return false; 2785 } 2786 2787 // -- Otherwise, the reference shall be to a non-volatile const 2788 // type (i.e., cv1 shall be const), or the reference shall be an 2789 // rvalue reference and the initializer expression shall be an rvalue. 2790 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2791 if (!ICS) 2792 Diag(Init->getSourceRange().getBegin(), 2793 diag::err_not_reference_to_const_init) 2794 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2795 << T2 << Init->getSourceRange(); 2796 return true; 2797 } 2798 2799 // -- If the initializer expression is an rvalue, with T2 a 2800 // class type, and “cv1 T1” is reference-compatible with 2801 // “cv2 T2,” the reference is bound in one of the 2802 // following ways (the choice is implementation-defined): 2803 // 2804 // -- The reference is bound to the object represented by 2805 // the rvalue (see 3.10) or to a sub-object within that 2806 // object. 2807 // 2808 // -- A temporary of type “cv1 T2” [sic] is created, and 2809 // a constructor is called to copy the entire rvalue 2810 // object into the temporary. The reference is bound to 2811 // the temporary or to a sub-object within the 2812 // temporary. 2813 // 2814 // The constructor that would be used to make the copy 2815 // shall be callable whether or not the copy is actually 2816 // done. 2817 // 2818 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2819 // freedom, so we will always take the first option and never build 2820 // a temporary in this case. FIXME: We will, however, have to check 2821 // for the presence of a copy constructor in C++98/03 mode. 2822 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2823 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2824 if (ICS) { 2825 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2826 ICS->Standard.First = ICK_Identity; 2827 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2828 ICS->Standard.Third = ICK_Identity; 2829 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2830 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2831 ICS->Standard.ReferenceBinding = true; 2832 ICS->Standard.DirectBinding = false; 2833 ICS->Standard.RRefBinding = isRValRef; 2834 ICS->Standard.CopyConstructor = 0; 2835 } else { 2836 // FIXME: Binding to a subobject of the rvalue is going to require more 2837 // AST annotation than this. 2838 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2839 } 2840 return false; 2841 } 2842 2843 // -- Otherwise, a temporary of type “cv1 T1” is created and 2844 // initialized from the initializer expression using the 2845 // rules for a non-reference copy initialization (8.5). The 2846 // reference is then bound to the temporary. If T1 is 2847 // reference-related to T2, cv1 must be the same 2848 // cv-qualification as, or greater cv-qualification than, 2849 // cv2; otherwise, the program is ill-formed. 2850 if (RefRelationship == Ref_Related) { 2851 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2852 // we would be reference-compatible or reference-compatible with 2853 // added qualification. But that wasn't the case, so the reference 2854 // initialization fails. 2855 if (!ICS) 2856 Diag(Init->getSourceRange().getBegin(), 2857 diag::err_reference_init_drops_quals) 2858 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2859 << T2 << Init->getSourceRange(); 2860 return true; 2861 } 2862 2863 // If at least one of the types is a class type, the types are not 2864 // related, and we aren't allowed any user conversions, the 2865 // reference binding fails. This case is important for breaking 2866 // recursion, since TryImplicitConversion below will attempt to 2867 // create a temporary through the use of a copy constructor. 2868 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2869 (T1->isRecordType() || T2->isRecordType())) { 2870 if (!ICS) 2871 Diag(Init->getSourceRange().getBegin(), 2872 diag::err_typecheck_convert_incompatible) 2873 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2874 return true; 2875 } 2876 2877 // Actually try to convert the initializer to T1. 2878 if (ICS) { 2879 // C++ [over.ics.ref]p2: 2880 // 2881 // When a parameter of reference type is not bound directly to 2882 // an argument expression, the conversion sequence is the one 2883 // required to convert the argument expression to the 2884 // underlying type of the reference according to 2885 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2886 // to copy-initializing a temporary of the underlying type with 2887 // the argument expression. Any difference in top-level 2888 // cv-qualification is subsumed by the initialization itself 2889 // and does not constitute a conversion. 2890 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2891 // Of course, that's still a reference binding. 2892 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2893 ICS->Standard.ReferenceBinding = true; 2894 ICS->Standard.RRefBinding = isRValRef; 2895 } else if(ICS->ConversionKind == 2896 ImplicitConversionSequence::UserDefinedConversion) { 2897 ICS->UserDefined.After.ReferenceBinding = true; 2898 ICS->UserDefined.After.RRefBinding = isRValRef; 2899 } 2900 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2901 } else { 2902 return PerformImplicitConversion(Init, T1, "initializing"); 2903 } 2904} 2905 2906/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2907/// of this overloaded operator is well-formed. If so, returns false; 2908/// otherwise, emits appropriate diagnostics and returns true. 2909bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2910 assert(FnDecl && FnDecl->isOverloadedOperator() && 2911 "Expected an overloaded operator declaration"); 2912 2913 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2914 2915 // C++ [over.oper]p5: 2916 // The allocation and deallocation functions, operator new, 2917 // operator new[], operator delete and operator delete[], are 2918 // described completely in 3.7.3. The attributes and restrictions 2919 // found in the rest of this subclause do not apply to them unless 2920 // explicitly stated in 3.7.3. 2921 // FIXME: Write a separate routine for checking this. For now, just allow it. 2922 if (Op == OO_New || Op == OO_Array_New || 2923 Op == OO_Delete || Op == OO_Array_Delete) 2924 return false; 2925 2926 // C++ [over.oper]p6: 2927 // An operator function shall either be a non-static member 2928 // function or be a non-member function and have at least one 2929 // parameter whose type is a class, a reference to a class, an 2930 // enumeration, or a reference to an enumeration. 2931 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2932 if (MethodDecl->isStatic()) 2933 return Diag(FnDecl->getLocation(), 2934 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2935 } else { 2936 bool ClassOrEnumParam = false; 2937 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2938 ParamEnd = FnDecl->param_end(); 2939 Param != ParamEnd; ++Param) { 2940 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2941 if (ParamType->isDependentType() || ParamType->isRecordType() || 2942 ParamType->isEnumeralType()) { 2943 ClassOrEnumParam = true; 2944 break; 2945 } 2946 } 2947 2948 if (!ClassOrEnumParam) 2949 return Diag(FnDecl->getLocation(), 2950 diag::err_operator_overload_needs_class_or_enum) 2951 << FnDecl->getDeclName(); 2952 } 2953 2954 // C++ [over.oper]p8: 2955 // An operator function cannot have default arguments (8.3.6), 2956 // except where explicitly stated below. 2957 // 2958 // Only the function-call operator allows default arguments 2959 // (C++ [over.call]p1). 2960 if (Op != OO_Call) { 2961 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2962 Param != FnDecl->param_end(); ++Param) { 2963 if ((*Param)->hasUnparsedDefaultArg()) 2964 return Diag((*Param)->getLocation(), 2965 diag::err_operator_overload_default_arg) 2966 << FnDecl->getDeclName(); 2967 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2968 return Diag((*Param)->getLocation(), 2969 diag::err_operator_overload_default_arg) 2970 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2971 } 2972 } 2973 2974 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2975 { false, false, false } 2976#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2977 , { Unary, Binary, MemberOnly } 2978#include "clang/Basic/OperatorKinds.def" 2979 }; 2980 2981 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2982 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2983 bool MustBeMemberOperator = OperatorUses[Op][2]; 2984 2985 // C++ [over.oper]p8: 2986 // [...] Operator functions cannot have more or fewer parameters 2987 // than the number required for the corresponding operator, as 2988 // described in the rest of this subclause. 2989 unsigned NumParams = FnDecl->getNumParams() 2990 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2991 if (Op != OO_Call && 2992 ((NumParams == 1 && !CanBeUnaryOperator) || 2993 (NumParams == 2 && !CanBeBinaryOperator) || 2994 (NumParams < 1) || (NumParams > 2))) { 2995 // We have the wrong number of parameters. 2996 unsigned ErrorKind; 2997 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2998 ErrorKind = 2; // 2 -> unary or binary. 2999 } else if (CanBeUnaryOperator) { 3000 ErrorKind = 0; // 0 -> unary 3001 } else { 3002 assert(CanBeBinaryOperator && 3003 "All non-call overloaded operators are unary or binary!"); 3004 ErrorKind = 1; // 1 -> binary 3005 } 3006 3007 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3008 << FnDecl->getDeclName() << NumParams << ErrorKind; 3009 } 3010 3011 // Overloaded operators other than operator() cannot be variadic. 3012 if (Op != OO_Call && 3013 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3014 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3015 << FnDecl->getDeclName(); 3016 } 3017 3018 // Some operators must be non-static member functions. 3019 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3020 return Diag(FnDecl->getLocation(), 3021 diag::err_operator_overload_must_be_member) 3022 << FnDecl->getDeclName(); 3023 } 3024 3025 // C++ [over.inc]p1: 3026 // The user-defined function called operator++ implements the 3027 // prefix and postfix ++ operator. If this function is a member 3028 // function with no parameters, or a non-member function with one 3029 // parameter of class or enumeration type, it defines the prefix 3030 // increment operator ++ for objects of that type. If the function 3031 // is a member function with one parameter (which shall be of type 3032 // int) or a non-member function with two parameters (the second 3033 // of which shall be of type int), it defines the postfix 3034 // increment operator ++ for objects of that type. 3035 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3036 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3037 bool ParamIsInt = false; 3038 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3039 ParamIsInt = BT->getKind() == BuiltinType::Int; 3040 3041 if (!ParamIsInt) 3042 return Diag(LastParam->getLocation(), 3043 diag::err_operator_overload_post_incdec_must_be_int) 3044 << LastParam->getType() << (Op == OO_MinusMinus); 3045 } 3046 3047 // Notify the class if it got an assignment operator. 3048 if (Op == OO_Equal) { 3049 // Would have returned earlier otherwise. 3050 assert(isa<CXXMethodDecl>(FnDecl) && 3051 "Overloaded = not member, but not filtered."); 3052 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3053 Method->getParent()->addedAssignmentOperator(Context, Method); 3054 } 3055 3056 return false; 3057} 3058 3059/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3060/// linkage specification, including the language and (if present) 3061/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3062/// the location of the language string literal, which is provided 3063/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3064/// the '{' brace. Otherwise, this linkage specification does not 3065/// have any braces. 3066Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3067 SourceLocation ExternLoc, 3068 SourceLocation LangLoc, 3069 const char *Lang, 3070 unsigned StrSize, 3071 SourceLocation LBraceLoc) { 3072 LinkageSpecDecl::LanguageIDs Language; 3073 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3074 Language = LinkageSpecDecl::lang_c; 3075 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3076 Language = LinkageSpecDecl::lang_cxx; 3077 else { 3078 Diag(LangLoc, diag::err_bad_language); 3079 return DeclPtrTy(); 3080 } 3081 3082 // FIXME: Add all the various semantics of linkage specifications 3083 3084 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3085 LangLoc, Language, 3086 LBraceLoc.isValid()); 3087 CurContext->addDecl(D); 3088 PushDeclContext(S, D); 3089 return DeclPtrTy::make(D); 3090} 3091 3092/// ActOnFinishLinkageSpecification - Completely the definition of 3093/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3094/// valid, it's the position of the closing '}' brace in a linkage 3095/// specification that uses braces. 3096Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3097 DeclPtrTy LinkageSpec, 3098 SourceLocation RBraceLoc) { 3099 if (LinkageSpec) 3100 PopDeclContext(); 3101 return LinkageSpec; 3102} 3103 3104/// \brief Perform semantic analysis for the variable declaration that 3105/// occurs within a C++ catch clause, returning the newly-created 3106/// variable. 3107VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3108 IdentifierInfo *Name, 3109 SourceLocation Loc, 3110 SourceRange Range) { 3111 bool Invalid = false; 3112 3113 // Arrays and functions decay. 3114 if (ExDeclType->isArrayType()) 3115 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3116 else if (ExDeclType->isFunctionType()) 3117 ExDeclType = Context.getPointerType(ExDeclType); 3118 3119 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3120 // The exception-declaration shall not denote a pointer or reference to an 3121 // incomplete type, other than [cv] void*. 3122 // N2844 forbids rvalue references. 3123 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3124 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3125 Invalid = true; 3126 } 3127 3128 QualType BaseType = ExDeclType; 3129 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3130 unsigned DK = diag::err_catch_incomplete; 3131 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 3132 BaseType = Ptr->getPointeeType(); 3133 Mode = 1; 3134 DK = diag::err_catch_incomplete_ptr; 3135 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3136 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3137 BaseType = Ref->getPointeeType(); 3138 Mode = 2; 3139 DK = diag::err_catch_incomplete_ref; 3140 } 3141 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3142 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3143 Invalid = true; 3144 3145 if (!Invalid && !ExDeclType->isDependentType() && 3146 RequireNonAbstractType(Loc, ExDeclType, 3147 diag::err_abstract_type_in_decl, 3148 AbstractVariableType)) 3149 Invalid = true; 3150 3151 // FIXME: Need to test for ability to copy-construct and destroy the 3152 // exception variable. 3153 3154 // FIXME: Need to check for abstract classes. 3155 3156 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3157 Name, ExDeclType, VarDecl::None, 3158 Range.getBegin()); 3159 3160 if (Invalid) 3161 ExDecl->setInvalidDecl(); 3162 3163 return ExDecl; 3164} 3165 3166/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3167/// handler. 3168Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3169 QualType ExDeclType = GetTypeForDeclarator(D, S); 3170 3171 bool Invalid = D.isInvalidType(); 3172 IdentifierInfo *II = D.getIdentifier(); 3173 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3174 // The scope should be freshly made just for us. There is just no way 3175 // it contains any previous declaration. 3176 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3177 if (PrevDecl->isTemplateParameter()) { 3178 // Maybe we will complain about the shadowed template parameter. 3179 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3180 } 3181 } 3182 3183 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3184 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3185 << D.getCXXScopeSpec().getRange(); 3186 Invalid = true; 3187 } 3188 3189 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3190 D.getIdentifier(), 3191 D.getIdentifierLoc(), 3192 D.getDeclSpec().getSourceRange()); 3193 3194 if (Invalid) 3195 ExDecl->setInvalidDecl(); 3196 3197 // Add the exception declaration into this scope. 3198 if (II) 3199 PushOnScopeChains(ExDecl, S); 3200 else 3201 CurContext->addDecl(ExDecl); 3202 3203 ProcessDeclAttributes(S, ExDecl, D); 3204 return DeclPtrTy::make(ExDecl); 3205} 3206 3207Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3208 ExprArg assertexpr, 3209 ExprArg assertmessageexpr) { 3210 Expr *AssertExpr = (Expr *)assertexpr.get(); 3211 StringLiteral *AssertMessage = 3212 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3213 3214 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3215 llvm::APSInt Value(32); 3216 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3217 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3218 AssertExpr->getSourceRange(); 3219 return DeclPtrTy(); 3220 } 3221 3222 if (Value == 0) { 3223 std::string str(AssertMessage->getStrData(), 3224 AssertMessage->getByteLength()); 3225 Diag(AssertLoc, diag::err_static_assert_failed) 3226 << str << AssertExpr->getSourceRange(); 3227 } 3228 } 3229 3230 assertexpr.release(); 3231 assertmessageexpr.release(); 3232 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3233 AssertExpr, AssertMessage); 3234 3235 CurContext->addDecl(Decl); 3236 return DeclPtrTy::make(Decl); 3237} 3238 3239bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3240 if (!(S->getFlags() & Scope::ClassScope)) { 3241 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3242 return true; 3243 } 3244 3245 return false; 3246} 3247 3248void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3249 Decl *Dcl = dcl.getAs<Decl>(); 3250 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3251 if (!Fn) { 3252 Diag(DelLoc, diag::err_deleted_non_function); 3253 return; 3254 } 3255 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3256 Diag(DelLoc, diag::err_deleted_decl_not_first); 3257 Diag(Prev->getLocation(), diag::note_previous_declaration); 3258 // If the declaration wasn't the first, we delete the function anyway for 3259 // recovery. 3260 } 3261 Fn->setDeleted(); 3262} 3263 3264static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3265 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3266 ++CI) { 3267 Stmt *SubStmt = *CI; 3268 if (!SubStmt) 3269 continue; 3270 if (isa<ReturnStmt>(SubStmt)) 3271 Self.Diag(SubStmt->getSourceRange().getBegin(), 3272 diag::err_return_in_constructor_handler); 3273 if (!isa<Expr>(SubStmt)) 3274 SearchForReturnInStmt(Self, SubStmt); 3275 } 3276} 3277 3278void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3279 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3280 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3281 SearchForReturnInStmt(*this, Handler); 3282 } 3283} 3284 3285bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3286 const CXXMethodDecl *Old) { 3287 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3288 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3289 3290 QualType CNewTy = Context.getCanonicalType(NewTy); 3291 QualType COldTy = Context.getCanonicalType(OldTy); 3292 3293 if (CNewTy == COldTy && 3294 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3295 return false; 3296 3297 // Check if the return types are covariant 3298 QualType NewClassTy, OldClassTy; 3299 3300 /// Both types must be pointers or references to classes. 3301 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3302 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3303 NewClassTy = NewPT->getPointeeType(); 3304 OldClassTy = OldPT->getPointeeType(); 3305 } 3306 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3307 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3308 NewClassTy = NewRT->getPointeeType(); 3309 OldClassTy = OldRT->getPointeeType(); 3310 } 3311 } 3312 3313 // The return types aren't either both pointers or references to a class type. 3314 if (NewClassTy.isNull()) { 3315 Diag(New->getLocation(), 3316 diag::err_different_return_type_for_overriding_virtual_function) 3317 << New->getDeclName() << NewTy << OldTy; 3318 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3319 3320 return true; 3321 } 3322 3323 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3324 // Check if the new class derives from the old class. 3325 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3326 Diag(New->getLocation(), 3327 diag::err_covariant_return_not_derived) 3328 << New->getDeclName() << NewTy << OldTy; 3329 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3330 return true; 3331 } 3332 3333 // Check if we the conversion from derived to base is valid. 3334 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3335 diag::err_covariant_return_inaccessible_base, 3336 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3337 // FIXME: Should this point to the return type? 3338 New->getLocation(), SourceRange(), New->getDeclName())) { 3339 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3340 return true; 3341 } 3342 } 3343 3344 // The qualifiers of the return types must be the same. 3345 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3346 Diag(New->getLocation(), 3347 diag::err_covariant_return_type_different_qualifications) 3348 << New->getDeclName() << NewTy << OldTy; 3349 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3350 return true; 3351 }; 3352 3353 3354 // The new class type must have the same or less qualifiers as the old type. 3355 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3356 Diag(New->getLocation(), 3357 diag::err_covariant_return_type_class_type_more_qualified) 3358 << New->getDeclName() << NewTy << OldTy; 3359 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3360 return true; 3361 }; 3362 3363 return false; 3364} 3365 3366bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3367 const CXXMethodDecl *Old) 3368{ 3369 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3370 diag::note_overridden_virtual_function, 3371 Old->getType()->getAsFunctionProtoType(), 3372 Old->getLocation(), 3373 New->getType()->getAsFunctionProtoType(), 3374 New->getLocation()); 3375} 3376 3377/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3378/// initializer for the declaration 'Dcl'. 3379/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3380/// static data member of class X, names should be looked up in the scope of 3381/// class X. 3382void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3383 Decl *D = Dcl.getAs<Decl>(); 3384 // If there is no declaration, there was an error parsing it. 3385 if (D == 0) 3386 return; 3387 3388 // Check whether it is a declaration with a nested name specifier like 3389 // int foo::bar; 3390 if (!D->isOutOfLine()) 3391 return; 3392 3393 // C++ [basic.lookup.unqual]p13 3394 // 3395 // A name used in the definition of a static data member of class X 3396 // (after the qualified-id of the static member) is looked up as if the name 3397 // was used in a member function of X. 3398 3399 // Change current context into the context of the initializing declaration. 3400 EnterDeclaratorContext(S, D->getDeclContext()); 3401} 3402 3403/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3404/// initializer for the declaration 'Dcl'. 3405void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3406 Decl *D = Dcl.getAs<Decl>(); 3407 // If there is no declaration, there was an error parsing it. 3408 if (D == 0) 3409 return; 3410 3411 // Check whether it is a declaration with a nested name specifier like 3412 // int foo::bar; 3413 if (!D->isOutOfLine()) 3414 return; 3415 3416 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3417 ExitDeclaratorContext(S); 3418} 3419