SemaDeclCXX.cpp revision 2943aed177b33ae3f14273b11a7b398e5276ec62
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/TypeOrdering.h" 19#include "clang/AST/StmtVisitor.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Parse/DeclSpec.h" 22#include "llvm/ADT/STLExtras.h" 23#include "llvm/Support/Compiler.h" 24#include <algorithm> // for std::equal 25#include <map> 26 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// CheckDefaultArgumentVisitor 31//===----------------------------------------------------------------------===// 32 33namespace { 34 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 35 /// the default argument of a parameter to determine whether it 36 /// contains any ill-formed subexpressions. For example, this will 37 /// diagnose the use of local variables or parameters within the 38 /// default argument expression. 39 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 40 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 41 Expr *DefaultArg; 42 Sema *S; 43 44 public: 45 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 46 : DefaultArg(defarg), S(s) {} 47 48 bool VisitExpr(Expr *Node); 49 bool VisitDeclRefExpr(DeclRefExpr *DRE); 50 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 51 }; 52 53 /// VisitExpr - Visit all of the children of this expression. 54 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 55 bool IsInvalid = false; 56 for (Stmt::child_iterator I = Node->child_begin(), 57 E = Node->child_end(); I != E; ++I) 58 IsInvalid |= Visit(*I); 59 return IsInvalid; 60 } 61 62 /// VisitDeclRefExpr - Visit a reference to a declaration, to 63 /// determine whether this declaration can be used in the default 64 /// argument expression. 65 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 66 NamedDecl *Decl = DRE->getDecl(); 67 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 68 // C++ [dcl.fct.default]p9 69 // Default arguments are evaluated each time the function is 70 // called. The order of evaluation of function arguments is 71 // unspecified. Consequently, parameters of a function shall not 72 // be used in default argument expressions, even if they are not 73 // evaluated. Parameters of a function declared before a default 74 // argument expression are in scope and can hide namespace and 75 // class member names. 76 return S->Diag(DRE->getSourceRange().getBegin(), 77 diag::err_param_default_argument_references_param) 78 << Param->getDeclName() << DefaultArg->getSourceRange(); 79 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 80 // C++ [dcl.fct.default]p7 81 // Local variables shall not be used in default argument 82 // expressions. 83 if (VDecl->isBlockVarDecl()) 84 return S->Diag(DRE->getSourceRange().getBegin(), 85 diag::err_param_default_argument_references_local) 86 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 87 } 88 89 return false; 90 } 91 92 /// VisitCXXThisExpr - Visit a C++ "this" expression. 93 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 94 // C++ [dcl.fct.default]p8: 95 // The keyword this shall not be used in a default argument of a 96 // member function. 97 return S->Diag(ThisE->getSourceRange().getBegin(), 98 diag::err_param_default_argument_references_this) 99 << ThisE->getSourceRange(); 100 } 101} 102 103/// ActOnParamDefaultArgument - Check whether the default argument 104/// provided for a function parameter is well-formed. If so, attach it 105/// to the parameter declaration. 106void 107Sema::ActOnParamDefaultArgument(DeclTy *param, SourceLocation EqualLoc, 108 ExprTy *defarg) { 109 ParmVarDecl *Param = (ParmVarDecl *)param; 110 ExprOwningPtr<Expr> DefaultArg(this, (Expr *)defarg); 111 QualType ParamType = Param->getType(); 112 113 // Default arguments are only permitted in C++ 114 if (!getLangOptions().CPlusPlus) { 115 Diag(EqualLoc, diag::err_param_default_argument) 116 << DefaultArg->getSourceRange(); 117 Param->setInvalidDecl(); 118 return; 119 } 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 Expr *DefaultArgPtr = DefaultArg.get(); 128 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 129 EqualLoc, 130 Param->getDeclName(), 131 /*DirectInit=*/false); 132 if (DefaultArgPtr != DefaultArg.get()) { 133 DefaultArg.take(); 134 DefaultArg.reset(DefaultArgPtr); 135 } 136 if (DefaultInitFailed) { 137 return; 138 } 139 140 // Check that the default argument is well-formed 141 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 142 if (DefaultArgChecker.Visit(DefaultArg.get())) { 143 Param->setInvalidDecl(); 144 return; 145 } 146 147 // Okay: add the default argument to the parameter 148 Param->setDefaultArg(DefaultArg.take()); 149} 150 151/// ActOnParamUnparsedDefaultArgument - We've seen a default 152/// argument for a function parameter, but we can't parse it yet 153/// because we're inside a class definition. Note that this default 154/// argument will be parsed later. 155void Sema::ActOnParamUnparsedDefaultArgument(DeclTy *param, 156 SourceLocation EqualLoc) { 157 ParmVarDecl *Param = (ParmVarDecl*)param; 158 if (Param) 159 Param->setUnparsedDefaultArg(); 160} 161 162/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 163/// the default argument for the parameter param failed. 164void Sema::ActOnParamDefaultArgumentError(DeclTy *param) { 165 ((ParmVarDecl*)param)->setInvalidDecl(); 166} 167 168/// CheckExtraCXXDefaultArguments - Check for any extra default 169/// arguments in the declarator, which is not a function declaration 170/// or definition and therefore is not permitted to have default 171/// arguments. This routine should be invoked for every declarator 172/// that is not a function declaration or definition. 173void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 174 // C++ [dcl.fct.default]p3 175 // A default argument expression shall be specified only in the 176 // parameter-declaration-clause of a function declaration or in a 177 // template-parameter (14.1). It shall not be specified for a 178 // parameter pack. If it is specified in a 179 // parameter-declaration-clause, it shall not occur within a 180 // declarator or abstract-declarator of a parameter-declaration. 181 for (unsigned i = 0; i < D.getNumTypeObjects(); ++i) { 182 DeclaratorChunk &chunk = D.getTypeObject(i); 183 if (chunk.Kind == DeclaratorChunk::Function) { 184 for (unsigned argIdx = 0; argIdx < chunk.Fun.NumArgs; ++argIdx) { 185 ParmVarDecl *Param = (ParmVarDecl *)chunk.Fun.ArgInfo[argIdx].Param; 186 if (Param->hasUnparsedDefaultArg()) { 187 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 188 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 189 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 190 delete Toks; 191 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 192 } else if (Param->getDefaultArg()) { 193 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 194 << Param->getDefaultArg()->getSourceRange(); 195 Param->setDefaultArg(0); 196 } 197 } 198 } 199 } 200} 201 202// MergeCXXFunctionDecl - Merge two declarations of the same C++ 203// function, once we already know that they have the same 204// type. Subroutine of MergeFunctionDecl. Returns true if there was an 205// error, false otherwise. 206bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 207 bool Invalid = false; 208 209 // C++ [dcl.fct.default]p4: 210 // 211 // For non-template functions, default arguments can be added in 212 // later declarations of a function in the same 213 // scope. Declarations in different scopes have completely 214 // distinct sets of default arguments. That is, declarations in 215 // inner scopes do not acquire default arguments from 216 // declarations in outer scopes, and vice versa. In a given 217 // function declaration, all parameters subsequent to a 218 // parameter with a default argument shall have default 219 // arguments supplied in this or previous declarations. A 220 // default argument shall not be redefined by a later 221 // declaration (not even to the same value). 222 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 223 ParmVarDecl *OldParam = Old->getParamDecl(p); 224 ParmVarDecl *NewParam = New->getParamDecl(p); 225 226 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 227 Diag(NewParam->getLocation(), 228 diag::err_param_default_argument_redefinition) 229 << NewParam->getDefaultArg()->getSourceRange(); 230 Diag(OldParam->getLocation(), diag::note_previous_definition); 231 Invalid = true; 232 } else if (OldParam->getDefaultArg()) { 233 // Merge the old default argument into the new parameter 234 NewParam->setDefaultArg(OldParam->getDefaultArg()); 235 } 236 } 237 238 return Invalid; 239} 240 241/// CheckCXXDefaultArguments - Verify that the default arguments for a 242/// function declaration are well-formed according to C++ 243/// [dcl.fct.default]. 244void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 245 unsigned NumParams = FD->getNumParams(); 246 unsigned p; 247 248 // Find first parameter with a default argument 249 for (p = 0; p < NumParams; ++p) { 250 ParmVarDecl *Param = FD->getParamDecl(p); 251 if (Param->getDefaultArg()) 252 break; 253 } 254 255 // C++ [dcl.fct.default]p4: 256 // In a given function declaration, all parameters 257 // subsequent to a parameter with a default argument shall 258 // have default arguments supplied in this or previous 259 // declarations. A default argument shall not be redefined 260 // by a later declaration (not even to the same value). 261 unsigned LastMissingDefaultArg = 0; 262 for(; p < NumParams; ++p) { 263 ParmVarDecl *Param = FD->getParamDecl(p); 264 if (!Param->getDefaultArg()) { 265 if (Param->isInvalidDecl()) 266 /* We already complained about this parameter. */; 267 else if (Param->getIdentifier()) 268 Diag(Param->getLocation(), 269 diag::err_param_default_argument_missing_name) 270 << Param->getIdentifier(); 271 else 272 Diag(Param->getLocation(), 273 diag::err_param_default_argument_missing); 274 275 LastMissingDefaultArg = p; 276 } 277 } 278 279 if (LastMissingDefaultArg > 0) { 280 // Some default arguments were missing. Clear out all of the 281 // default arguments up to (and including) the last missing 282 // default argument, so that we leave the function parameters 283 // in a semantically valid state. 284 for (p = 0; p <= LastMissingDefaultArg; ++p) { 285 ParmVarDecl *Param = FD->getParamDecl(p); 286 if (Param->getDefaultArg()) { 287 if (!Param->hasUnparsedDefaultArg()) 288 Param->getDefaultArg()->Destroy(Context); 289 Param->setDefaultArg(0); 290 } 291 } 292 } 293} 294 295/// isCurrentClassName - Determine whether the identifier II is the 296/// name of the class type currently being defined. In the case of 297/// nested classes, this will only return true if II is the name of 298/// the innermost class. 299bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 300 const CXXScopeSpec *SS) { 301 CXXRecordDecl *CurDecl; 302 if (SS) { 303 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 304 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 305 } else 306 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 307 308 if (CurDecl) 309 return &II == CurDecl->getIdentifier(); 310 else 311 return false; 312} 313 314/// \brief Check the validity of a C++ base class specifier. 315/// 316/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 317/// and returns NULL otherwise. 318CXXBaseSpecifier * 319Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 320 SourceRange SpecifierRange, 321 bool Virtual, AccessSpecifier Access, 322 QualType BaseType, 323 SourceLocation BaseLoc) { 324 // C++ [class.union]p1: 325 // A union shall not have base classes. 326 if (Class->isUnion()) { 327 Diag(Class->getLocation(), diag::err_base_clause_on_union) 328 << SpecifierRange; 329 return 0; 330 } 331 332 if (BaseType->isDependentType()) 333 return new CXXBaseSpecifier(SpecifierRange, Virtual, 334 Class->getTagKind() == RecordDecl::TK_class, 335 Access, BaseType); 336 337 // Base specifiers must be record types. 338 if (!BaseType->isRecordType()) { 339 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 340 return 0; 341 } 342 343 // C++ [class.union]p1: 344 // A union shall not be used as a base class. 345 if (BaseType->isUnionType()) { 346 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 347 return 0; 348 } 349 350 // C++ [class.derived]p2: 351 // The class-name in a base-specifier shall not be an incompletely 352 // defined class. 353 if (DiagnoseIncompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 354 SpecifierRange)) 355 return 0; 356 357 // If the base class is polymorphic, the new one is, too. 358 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 359 assert(BaseDecl && "Record type has no declaration"); 360 BaseDecl = BaseDecl->getDefinition(Context); 361 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 362 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 363 Class->setPolymorphic(true); 364 365 // C++ [dcl.init.aggr]p1: 366 // An aggregate is [...] a class with [...] no base classes [...]. 367 Class->setAggregate(false); 368 Class->setPOD(false); 369 370 // Create the base specifier. 371 // FIXME: Allocate via ASTContext? 372 return new CXXBaseSpecifier(SpecifierRange, Virtual, 373 Class->getTagKind() == RecordDecl::TK_class, 374 Access, BaseType); 375} 376 377/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 378/// one entry in the base class list of a class specifier, for 379/// example: 380/// class foo : public bar, virtual private baz { 381/// 'public bar' and 'virtual private baz' are each base-specifiers. 382Sema::BaseResult 383Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 384 bool Virtual, AccessSpecifier Access, 385 TypeTy *basetype, SourceLocation BaseLoc) { 386 CXXRecordDecl *Class = (CXXRecordDecl*)classdecl; 387 QualType BaseType = QualType::getFromOpaquePtr(basetype); 388 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 389 Virtual, Access, 390 BaseType, BaseLoc)) 391 return BaseSpec; 392 393 return true; 394} 395 396/// \brief Performs the actual work of attaching the given base class 397/// specifiers to a C++ class. 398bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 399 unsigned NumBases) { 400 if (NumBases == 0) 401 return false; 402 403 // Used to keep track of which base types we have already seen, so 404 // that we can properly diagnose redundant direct base types. Note 405 // that the key is always the unqualified canonical type of the base 406 // class. 407 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 408 409 // Copy non-redundant base specifiers into permanent storage. 410 unsigned NumGoodBases = 0; 411 bool Invalid = false; 412 for (unsigned idx = 0; idx < NumBases; ++idx) { 413 QualType NewBaseType 414 = Context.getCanonicalType(Bases[idx]->getType()); 415 NewBaseType = NewBaseType.getUnqualifiedType(); 416 417 if (KnownBaseTypes[NewBaseType]) { 418 // C++ [class.mi]p3: 419 // A class shall not be specified as a direct base class of a 420 // derived class more than once. 421 Diag(Bases[idx]->getSourceRange().getBegin(), 422 diag::err_duplicate_base_class) 423 << KnownBaseTypes[NewBaseType]->getType() 424 << Bases[idx]->getSourceRange(); 425 426 // Delete the duplicate base class specifier; we're going to 427 // overwrite its pointer later. 428 delete Bases[idx]; 429 430 Invalid = true; 431 } else { 432 // Okay, add this new base class. 433 KnownBaseTypes[NewBaseType] = Bases[idx]; 434 Bases[NumGoodBases++] = Bases[idx]; 435 } 436 } 437 438 // Attach the remaining base class specifiers to the derived class. 439 Class->setBases(Bases, NumGoodBases); 440 441 // Delete the remaining (good) base class specifiers, since their 442 // data has been copied into the CXXRecordDecl. 443 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 444 delete Bases[idx]; 445 446 return Invalid; 447} 448 449/// ActOnBaseSpecifiers - Attach the given base specifiers to the 450/// class, after checking whether there are any duplicate base 451/// classes. 452void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 453 unsigned NumBases) { 454 if (!ClassDecl || !Bases || !NumBases) 455 return; 456 457 AdjustDeclIfTemplate(ClassDecl); 458 AttachBaseSpecifiers(cast<CXXRecordDecl>((Decl*)ClassDecl), 459 (CXXBaseSpecifier**)(Bases), NumBases); 460} 461 462//===----------------------------------------------------------------------===// 463// C++ class member Handling 464//===----------------------------------------------------------------------===// 465 466/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 467/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 468/// bitfield width if there is one and 'InitExpr' specifies the initializer if 469/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 470/// declarators on it. 471Sema::DeclTy * 472Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 473 ExprTy *BW, ExprTy *InitExpr, 474 DeclTy *LastInGroup) { 475 const DeclSpec &DS = D.getDeclSpec(); 476 DeclarationName Name = GetNameForDeclarator(D); 477 Expr *BitWidth = static_cast<Expr*>(BW); 478 Expr *Init = static_cast<Expr*>(InitExpr); 479 SourceLocation Loc = D.getIdentifierLoc(); 480 481 bool isFunc = D.isFunctionDeclarator(); 482 483 // C++ 9.2p6: A member shall not be declared to have automatic storage 484 // duration (auto, register) or with the extern storage-class-specifier. 485 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 486 // data members and cannot be applied to names declared const or static, 487 // and cannot be applied to reference members. 488 switch (DS.getStorageClassSpec()) { 489 case DeclSpec::SCS_unspecified: 490 case DeclSpec::SCS_typedef: 491 case DeclSpec::SCS_static: 492 // FALL THROUGH. 493 break; 494 case DeclSpec::SCS_mutable: 495 if (isFunc) { 496 if (DS.getStorageClassSpecLoc().isValid()) 497 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 498 else 499 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 500 501 // FIXME: It would be nicer if the keyword was ignored only for this 502 // declarator. Otherwise we could get follow-up errors. 503 D.getMutableDeclSpec().ClearStorageClassSpecs(); 504 } else { 505 QualType T = GetTypeForDeclarator(D, S); 506 diag::kind err = static_cast<diag::kind>(0); 507 if (T->isReferenceType()) 508 err = diag::err_mutable_reference; 509 else if (T.isConstQualified()) 510 err = diag::err_mutable_const; 511 if (err != 0) { 512 if (DS.getStorageClassSpecLoc().isValid()) 513 Diag(DS.getStorageClassSpecLoc(), err); 514 else 515 Diag(DS.getThreadSpecLoc(), err); 516 // FIXME: It would be nicer if the keyword was ignored only for this 517 // declarator. Otherwise we could get follow-up errors. 518 D.getMutableDeclSpec().ClearStorageClassSpecs(); 519 } 520 } 521 break; 522 default: 523 if (DS.getStorageClassSpecLoc().isValid()) 524 Diag(DS.getStorageClassSpecLoc(), 525 diag::err_storageclass_invalid_for_member); 526 else 527 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 528 D.getMutableDeclSpec().ClearStorageClassSpecs(); 529 } 530 531 if (!isFunc && 532 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 533 D.getNumTypeObjects() == 0) { 534 // Check also for this case: 535 // 536 // typedef int f(); 537 // f a; 538 // 539 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 540 isFunc = TDType->isFunctionType(); 541 } 542 543 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 544 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 545 !isFunc); 546 547 Decl *Member; 548 bool InvalidDecl = false; 549 550 if (isInstField) 551 Member = static_cast<Decl*>(ActOnField(S, cast<CXXRecordDecl>(CurContext), 552 Loc, D, BitWidth)); 553 else 554 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 555 556 if (!Member) return LastInGroup; 557 558 assert((Name || isInstField) && "No identifier for non-field ?"); 559 560 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 561 // specific methods. Use a wrapper class that can be used with all C++ class 562 // member decls. 563 CXXClassMemberWrapper(Member).setAccess(AS); 564 565 // C++ [dcl.init.aggr]p1: 566 // An aggregate is an array or a class (clause 9) with [...] no 567 // private or protected non-static data members (clause 11). 568 // A POD must be an aggregate. 569 if (isInstField && (AS == AS_private || AS == AS_protected)) { 570 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 571 Record->setAggregate(false); 572 Record->setPOD(false); 573 } 574 575 if (DS.isVirtualSpecified()) { 576 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 577 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 578 InvalidDecl = true; 579 } else { 580 cast<CXXMethodDecl>(Member)->setVirtual(); 581 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 582 CurClass->setAggregate(false); 583 CurClass->setPOD(false); 584 CurClass->setPolymorphic(true); 585 } 586 } 587 588 // FIXME: The above definition of virtual is not sufficient. A function is 589 // also virtual if it overrides an already virtual function. This is important 590 // to do here because it decides the validity of a pure specifier. 591 592 if (BitWidth) { 593 // C++ 9.6p2: Only when declaring an unnamed bit-field may the 594 // constant-expression be a value equal to zero. 595 // FIXME: Check this. 596 597 if (D.isFunctionDeclarator()) { 598 // FIXME: Emit diagnostic about only constructors taking base initializers 599 // or something similar, when constructor support is in place. 600 Diag(Loc, diag::err_not_bitfield_type) 601 << Name << BitWidth->getSourceRange(); 602 InvalidDecl = true; 603 604 } else if (isInstField) { 605 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 606 if (!cast<FieldDecl>(Member)->getType()->isIntegralType()) { 607 Diag(Loc, diag::err_not_integral_type_bitfield) 608 << Name << BitWidth->getSourceRange(); 609 InvalidDecl = true; 610 } 611 612 } else if (isa<FunctionDecl>(Member)) { 613 // A function typedef ("typedef int f(); f a;"). 614 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 615 Diag(Loc, diag::err_not_integral_type_bitfield) 616 << Name << BitWidth->getSourceRange(); 617 InvalidDecl = true; 618 619 } else if (isa<TypedefDecl>(Member)) { 620 // "cannot declare 'A' to be a bit-field type" 621 Diag(Loc, diag::err_not_bitfield_type) 622 << Name << BitWidth->getSourceRange(); 623 InvalidDecl = true; 624 625 } else { 626 assert(isa<CXXClassVarDecl>(Member) && 627 "Didn't we cover all member kinds?"); 628 // C++ 9.6p3: A bit-field shall not be a static member. 629 // "static member 'A' cannot be a bit-field" 630 Diag(Loc, diag::err_static_not_bitfield) 631 << Name << BitWidth->getSourceRange(); 632 InvalidDecl = true; 633 } 634 } 635 636 if (Init) { 637 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 638 // if it declares a static member of const integral or const enumeration 639 // type. 640 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 641 // ...static member of... 642 CVD->setInit(Init); 643 // ...const integral or const enumeration type. 644 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 645 CVD->getType()->isIntegralType()) { 646 // constant-initializer 647 if (CheckForConstantInitializer(Init, CVD->getType())) 648 InvalidDecl = true; 649 650 } else { 651 // not const integral. 652 Diag(Loc, diag::err_member_initialization) 653 << Name << Init->getSourceRange(); 654 InvalidDecl = true; 655 } 656 657 } else { 658 // not static member. perhaps virtual function? 659 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member)) { 660 // With declarators parsed the way they are, the parser cannot 661 // distinguish between a normal initializer and a pure-specifier. 662 // Thus this grotesque test. 663 IntegerLiteral *IL; 664 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 665 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 666 if (MD->isVirtual()) 667 MD->setPure(); 668 else { 669 Diag(Loc, diag::err_non_virtual_pure) 670 << Name << Init->getSourceRange(); 671 InvalidDecl = true; 672 } 673 } else { 674 Diag(Loc, diag::err_member_function_initialization) 675 << Name << Init->getSourceRange(); 676 InvalidDecl = true; 677 } 678 } else { 679 Diag(Loc, diag::err_member_initialization) 680 << Name << Init->getSourceRange(); 681 InvalidDecl = true; 682 } 683 } 684 } 685 686 if (InvalidDecl) 687 Member->setInvalidDecl(); 688 689 if (isInstField) { 690 FieldCollector->Add(cast<FieldDecl>(Member)); 691 return LastInGroup; 692 } 693 return Member; 694} 695 696/// ActOnMemInitializer - Handle a C++ member initializer. 697Sema::MemInitResult 698Sema::ActOnMemInitializer(DeclTy *ConstructorD, 699 Scope *S, 700 IdentifierInfo *MemberOrBase, 701 SourceLocation IdLoc, 702 SourceLocation LParenLoc, 703 ExprTy **Args, unsigned NumArgs, 704 SourceLocation *CommaLocs, 705 SourceLocation RParenLoc) { 706 CXXConstructorDecl *Constructor 707 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 708 if (!Constructor) { 709 // The user wrote a constructor initializer on a function that is 710 // not a C++ constructor. Ignore the error for now, because we may 711 // have more member initializers coming; we'll diagnose it just 712 // once in ActOnMemInitializers. 713 return true; 714 } 715 716 CXXRecordDecl *ClassDecl = Constructor->getParent(); 717 718 // C++ [class.base.init]p2: 719 // Names in a mem-initializer-id are looked up in the scope of the 720 // constructor’s class and, if not found in that scope, are looked 721 // up in the scope containing the constructor’s 722 // definition. [Note: if the constructor’s class contains a member 723 // with the same name as a direct or virtual base class of the 724 // class, a mem-initializer-id naming the member or base class and 725 // composed of a single identifier refers to the class member. A 726 // mem-initializer-id for the hidden base class may be specified 727 // using a qualified name. ] 728 // Look for a member, first. 729 FieldDecl *Member = 0; 730 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 731 if (Result.first != Result.second) 732 Member = dyn_cast<FieldDecl>(*Result.first); 733 734 // FIXME: Handle members of an anonymous union. 735 736 if (Member) { 737 // FIXME: Perform direct initialization of the member. 738 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 739 } 740 741 // It didn't name a member, so see if it names a class. 742 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 743 if (!BaseTy) 744 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 745 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 746 747 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 748 if (!BaseType->isRecordType()) 749 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 750 << BaseType << SourceRange(IdLoc, RParenLoc); 751 752 // C++ [class.base.init]p2: 753 // [...] Unless the mem-initializer-id names a nonstatic data 754 // member of the constructor’s class or a direct or virtual base 755 // of that class, the mem-initializer is ill-formed. A 756 // mem-initializer-list can initialize a base class using any 757 // name that denotes that base class type. 758 759 // First, check for a direct base class. 760 const CXXBaseSpecifier *DirectBaseSpec = 0; 761 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 762 Base != ClassDecl->bases_end(); ++Base) { 763 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 764 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 765 // We found a direct base of this type. That's what we're 766 // initializing. 767 DirectBaseSpec = &*Base; 768 break; 769 } 770 } 771 772 // Check for a virtual base class. 773 // FIXME: We might be able to short-circuit this if we know in 774 // advance that there are no virtual bases. 775 const CXXBaseSpecifier *VirtualBaseSpec = 0; 776 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 777 // We haven't found a base yet; search the class hierarchy for a 778 // virtual base class. 779 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 780 /*DetectVirtual=*/false); 781 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 782 for (BasePaths::paths_iterator Path = Paths.begin(); 783 Path != Paths.end(); ++Path) { 784 if (Path->back().Base->isVirtual()) { 785 VirtualBaseSpec = Path->back().Base; 786 break; 787 } 788 } 789 } 790 } 791 792 // C++ [base.class.init]p2: 793 // If a mem-initializer-id is ambiguous because it designates both 794 // a direct non-virtual base class and an inherited virtual base 795 // class, the mem-initializer is ill-formed. 796 if (DirectBaseSpec && VirtualBaseSpec) 797 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 798 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 799 800 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 801} 802 803 804void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 805 DeclTy *TagDecl, 806 SourceLocation LBrac, 807 SourceLocation RBrac) { 808 TemplateDecl *Template = AdjustDeclIfTemplate(TagDecl); 809 ActOnFields(S, RLoc, TagDecl, 810 (DeclTy**)FieldCollector->getCurFields(), 811 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 812 813 if (!Template) 814 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 815} 816 817/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 818/// special functions, such as the default constructor, copy 819/// constructor, or destructor, to the given C++ class (C++ 820/// [special]p1). This routine can only be executed just before the 821/// definition of the class is complete. 822void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 823 QualType ClassType = Context.getTypeDeclType(ClassDecl); 824 ClassType = Context.getCanonicalType(ClassType); 825 826 if (!ClassDecl->hasUserDeclaredConstructor()) { 827 // C++ [class.ctor]p5: 828 // A default constructor for a class X is a constructor of class X 829 // that can be called without an argument. If there is no 830 // user-declared constructor for class X, a default constructor is 831 // implicitly declared. An implicitly-declared default constructor 832 // is an inline public member of its class. 833 DeclarationName Name 834 = Context.DeclarationNames.getCXXConstructorName(ClassType); 835 CXXConstructorDecl *DefaultCon = 836 CXXConstructorDecl::Create(Context, ClassDecl, 837 ClassDecl->getLocation(), Name, 838 Context.getFunctionType(Context.VoidTy, 839 0, 0, false, 0), 840 /*isExplicit=*/false, 841 /*isInline=*/true, 842 /*isImplicitlyDeclared=*/true); 843 DefaultCon->setAccess(AS_public); 844 DefaultCon->setImplicit(); 845 ClassDecl->addDecl(DefaultCon); 846 847 // Notify the class that we've added a constructor. 848 ClassDecl->addedConstructor(Context, DefaultCon); 849 } 850 851 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 852 // C++ [class.copy]p4: 853 // If the class definition does not explicitly declare a copy 854 // constructor, one is declared implicitly. 855 856 // C++ [class.copy]p5: 857 // The implicitly-declared copy constructor for a class X will 858 // have the form 859 // 860 // X::X(const X&) 861 // 862 // if 863 bool HasConstCopyConstructor = true; 864 865 // -- each direct or virtual base class B of X has a copy 866 // constructor whose first parameter is of type const B& or 867 // const volatile B&, and 868 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 869 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 870 const CXXRecordDecl *BaseClassDecl 871 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 872 HasConstCopyConstructor 873 = BaseClassDecl->hasConstCopyConstructor(Context); 874 } 875 876 // -- for all the nonstatic data members of X that are of a 877 // class type M (or array thereof), each such class type 878 // has a copy constructor whose first parameter is of type 879 // const M& or const volatile M&. 880 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 881 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 882 QualType FieldType = (*Field)->getType(); 883 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 884 FieldType = Array->getElementType(); 885 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 886 const CXXRecordDecl *FieldClassDecl 887 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 888 HasConstCopyConstructor 889 = FieldClassDecl->hasConstCopyConstructor(Context); 890 } 891 } 892 893 // Otherwise, the implicitly declared copy constructor will have 894 // the form 895 // 896 // X::X(X&) 897 QualType ArgType = ClassType; 898 if (HasConstCopyConstructor) 899 ArgType = ArgType.withConst(); 900 ArgType = Context.getReferenceType(ArgType); 901 902 // An implicitly-declared copy constructor is an inline public 903 // member of its class. 904 DeclarationName Name 905 = Context.DeclarationNames.getCXXConstructorName(ClassType); 906 CXXConstructorDecl *CopyConstructor 907 = CXXConstructorDecl::Create(Context, ClassDecl, 908 ClassDecl->getLocation(), Name, 909 Context.getFunctionType(Context.VoidTy, 910 &ArgType, 1, 911 false, 0), 912 /*isExplicit=*/false, 913 /*isInline=*/true, 914 /*isImplicitlyDeclared=*/true); 915 CopyConstructor->setAccess(AS_public); 916 CopyConstructor->setImplicit(); 917 918 // Add the parameter to the constructor. 919 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 920 ClassDecl->getLocation(), 921 /*IdentifierInfo=*/0, 922 ArgType, VarDecl::None, 0); 923 CopyConstructor->setParams(Context, &FromParam, 1); 924 925 ClassDecl->addedConstructor(Context, CopyConstructor); 926 ClassDecl->addDecl(CopyConstructor); 927 } 928 929 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 930 // Note: The following rules are largely analoguous to the copy 931 // constructor rules. Note that virtual bases are not taken into account 932 // for determining the argument type of the operator. Note also that 933 // operators taking an object instead of a reference are allowed. 934 // 935 // C++ [class.copy]p10: 936 // If the class definition does not explicitly declare a copy 937 // assignment operator, one is declared implicitly. 938 // The implicitly-defined copy assignment operator for a class X 939 // will have the form 940 // 941 // X& X::operator=(const X&) 942 // 943 // if 944 bool HasConstCopyAssignment = true; 945 946 // -- each direct base class B of X has a copy assignment operator 947 // whose parameter is of type const B&, const volatile B& or B, 948 // and 949 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 950 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 951 const CXXRecordDecl *BaseClassDecl 952 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 953 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 954 } 955 956 // -- for all the nonstatic data members of X that are of a class 957 // type M (or array thereof), each such class type has a copy 958 // assignment operator whose parameter is of type const M&, 959 // const volatile M& or M. 960 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 961 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 962 QualType FieldType = (*Field)->getType(); 963 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 964 FieldType = Array->getElementType(); 965 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 966 const CXXRecordDecl *FieldClassDecl 967 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 968 HasConstCopyAssignment 969 = FieldClassDecl->hasConstCopyAssignment(Context); 970 } 971 } 972 973 // Otherwise, the implicitly declared copy assignment operator will 974 // have the form 975 // 976 // X& X::operator=(X&) 977 QualType ArgType = ClassType; 978 QualType RetType = Context.getReferenceType(ArgType); 979 if (HasConstCopyAssignment) 980 ArgType = ArgType.withConst(); 981 ArgType = Context.getReferenceType(ArgType); 982 983 // An implicitly-declared copy assignment operator is an inline public 984 // member of its class. 985 DeclarationName Name = 986 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 987 CXXMethodDecl *CopyAssignment = 988 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 989 Context.getFunctionType(RetType, &ArgType, 1, 990 false, 0), 991 /*isStatic=*/false, /*isInline=*/true); 992 CopyAssignment->setAccess(AS_public); 993 CopyAssignment->setImplicit(); 994 995 // Add the parameter to the operator. 996 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 997 ClassDecl->getLocation(), 998 /*IdentifierInfo=*/0, 999 ArgType, VarDecl::None, 0); 1000 CopyAssignment->setParams(Context, &FromParam, 1); 1001 1002 // Don't call addedAssignmentOperator. There is no way to distinguish an 1003 // implicit from an explicit assignment operator. 1004 ClassDecl->addDecl(CopyAssignment); 1005 } 1006 1007 if (!ClassDecl->hasUserDeclaredDestructor()) { 1008 // C++ [class.dtor]p2: 1009 // If a class has no user-declared destructor, a destructor is 1010 // declared implicitly. An implicitly-declared destructor is an 1011 // inline public member of its class. 1012 DeclarationName Name 1013 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1014 CXXDestructorDecl *Destructor 1015 = CXXDestructorDecl::Create(Context, ClassDecl, 1016 ClassDecl->getLocation(), Name, 1017 Context.getFunctionType(Context.VoidTy, 1018 0, 0, false, 0), 1019 /*isInline=*/true, 1020 /*isImplicitlyDeclared=*/true); 1021 Destructor->setAccess(AS_public); 1022 Destructor->setImplicit(); 1023 ClassDecl->addDecl(Destructor); 1024 } 1025} 1026 1027/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1028/// parsing a top-level (non-nested) C++ class, and we are now 1029/// parsing those parts of the given Method declaration that could 1030/// not be parsed earlier (C++ [class.mem]p2), such as default 1031/// arguments. This action should enter the scope of the given 1032/// Method declaration as if we had just parsed the qualified method 1033/// name. However, it should not bring the parameters into scope; 1034/// that will be performed by ActOnDelayedCXXMethodParameter. 1035void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 1036 CXXScopeSpec SS; 1037 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 1038 ActOnCXXEnterDeclaratorScope(S, SS); 1039} 1040 1041/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1042/// C++ method declaration. We're (re-)introducing the given 1043/// function parameter into scope for use in parsing later parts of 1044/// the method declaration. For example, we could see an 1045/// ActOnParamDefaultArgument event for this parameter. 1046void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1047 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1048 1049 // If this parameter has an unparsed default argument, clear it out 1050 // to make way for the parsed default argument. 1051 if (Param->hasUnparsedDefaultArg()) 1052 Param->setDefaultArg(0); 1053 1054 S->AddDecl(Param); 1055 if (Param->getDeclName()) 1056 IdResolver.AddDecl(Param); 1057} 1058 1059/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1060/// processing the delayed method declaration for Method. The method 1061/// declaration is now considered finished. There may be a separate 1062/// ActOnStartOfFunctionDef action later (not necessarily 1063/// immediately!) for this method, if it was also defined inside the 1064/// class body. 1065void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1066 FunctionDecl *Method = (FunctionDecl*)MethodD; 1067 CXXScopeSpec SS; 1068 SS.setScopeRep(Method->getDeclContext()); 1069 ActOnCXXExitDeclaratorScope(S, SS); 1070 1071 // Now that we have our default arguments, check the constructor 1072 // again. It could produce additional diagnostics or affect whether 1073 // the class has implicitly-declared destructors, among other 1074 // things. 1075 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1076 if (CheckConstructor(Constructor)) 1077 Constructor->setInvalidDecl(); 1078 } 1079 1080 // Check the default arguments, which we may have added. 1081 if (!Method->isInvalidDecl()) 1082 CheckCXXDefaultArguments(Method); 1083} 1084 1085/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1086/// the well-formedness of the constructor declarator @p D with type @p 1087/// R. If there are any errors in the declarator, this routine will 1088/// emit diagnostics and return true. Otherwise, it will return 1089/// false. Either way, the type @p R will be updated to reflect a 1090/// well-formed type for the constructor. 1091bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1092 FunctionDecl::StorageClass& SC) { 1093 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1094 bool isInvalid = false; 1095 1096 // C++ [class.ctor]p3: 1097 // A constructor shall not be virtual (10.3) or static (9.4). A 1098 // constructor can be invoked for a const, volatile or const 1099 // volatile object. A constructor shall not be declared const, 1100 // volatile, or const volatile (9.3.2). 1101 if (isVirtual) { 1102 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1103 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1104 << SourceRange(D.getIdentifierLoc()); 1105 isInvalid = true; 1106 } 1107 if (SC == FunctionDecl::Static) { 1108 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1109 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1110 << SourceRange(D.getIdentifierLoc()); 1111 isInvalid = true; 1112 SC = FunctionDecl::None; 1113 } 1114 if (D.getDeclSpec().hasTypeSpecifier()) { 1115 // Constructors don't have return types, but the parser will 1116 // happily parse something like: 1117 // 1118 // class X { 1119 // float X(float); 1120 // }; 1121 // 1122 // The return type will be eliminated later. 1123 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1124 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1125 << SourceRange(D.getIdentifierLoc()); 1126 } 1127 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1128 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1129 if (FTI.TypeQuals & QualType::Const) 1130 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1131 << "const" << SourceRange(D.getIdentifierLoc()); 1132 if (FTI.TypeQuals & QualType::Volatile) 1133 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1134 << "volatile" << SourceRange(D.getIdentifierLoc()); 1135 if (FTI.TypeQuals & QualType::Restrict) 1136 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1137 << "restrict" << SourceRange(D.getIdentifierLoc()); 1138 } 1139 1140 // Rebuild the function type "R" without any type qualifiers (in 1141 // case any of the errors above fired) and with "void" as the 1142 // return type, since constructors don't have return types. We 1143 // *always* have to do this, because GetTypeForDeclarator will 1144 // put in a result type of "int" when none was specified. 1145 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1146 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1147 Proto->getNumArgs(), 1148 Proto->isVariadic(), 1149 0); 1150 1151 return isInvalid; 1152} 1153 1154/// CheckConstructor - Checks a fully-formed constructor for 1155/// well-formedness, issuing any diagnostics required. Returns true if 1156/// the constructor declarator is invalid. 1157bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1158 if (Constructor->isInvalidDecl()) 1159 return true; 1160 1161 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1162 bool Invalid = false; 1163 1164 // C++ [class.copy]p3: 1165 // A declaration of a constructor for a class X is ill-formed if 1166 // its first parameter is of type (optionally cv-qualified) X and 1167 // either there are no other parameters or else all other 1168 // parameters have default arguments. 1169 if ((Constructor->getNumParams() == 1) || 1170 (Constructor->getNumParams() > 1 && 1171 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1172 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1173 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1174 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1175 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1176 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1177 Invalid = true; 1178 } 1179 } 1180 1181 // Notify the class that we've added a constructor. 1182 ClassDecl->addedConstructor(Context, Constructor); 1183 1184 return Invalid; 1185} 1186 1187/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1188/// the well-formednes of the destructor declarator @p D with type @p 1189/// R. If there are any errors in the declarator, this routine will 1190/// emit diagnostics and return true. Otherwise, it will return 1191/// false. Either way, the type @p R will be updated to reflect a 1192/// well-formed type for the destructor. 1193bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1194 FunctionDecl::StorageClass& SC) { 1195 bool isInvalid = false; 1196 1197 // C++ [class.dtor]p1: 1198 // [...] A typedef-name that names a class is a class-name 1199 // (7.1.3); however, a typedef-name that names a class shall not 1200 // be used as the identifier in the declarator for a destructor 1201 // declaration. 1202 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1203 if (DeclaratorType->getAsTypedefType()) { 1204 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1205 << DeclaratorType; 1206 isInvalid = true; 1207 } 1208 1209 // C++ [class.dtor]p2: 1210 // A destructor is used to destroy objects of its class type. A 1211 // destructor takes no parameters, and no return type can be 1212 // specified for it (not even void). The address of a destructor 1213 // shall not be taken. A destructor shall not be static. A 1214 // destructor can be invoked for a const, volatile or const 1215 // volatile object. A destructor shall not be declared const, 1216 // volatile or const volatile (9.3.2). 1217 if (SC == FunctionDecl::Static) { 1218 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1219 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1220 << SourceRange(D.getIdentifierLoc()); 1221 isInvalid = true; 1222 SC = FunctionDecl::None; 1223 } 1224 if (D.getDeclSpec().hasTypeSpecifier()) { 1225 // Destructors don't have return types, but the parser will 1226 // happily parse something like: 1227 // 1228 // class X { 1229 // float ~X(); 1230 // }; 1231 // 1232 // The return type will be eliminated later. 1233 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1234 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1235 << SourceRange(D.getIdentifierLoc()); 1236 } 1237 if (R->getAsFunctionProtoType()->getTypeQuals() != 0) { 1238 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1239 if (FTI.TypeQuals & QualType::Const) 1240 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1241 << "const" << SourceRange(D.getIdentifierLoc()); 1242 if (FTI.TypeQuals & QualType::Volatile) 1243 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1244 << "volatile" << SourceRange(D.getIdentifierLoc()); 1245 if (FTI.TypeQuals & QualType::Restrict) 1246 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1247 << "restrict" << SourceRange(D.getIdentifierLoc()); 1248 } 1249 1250 // Make sure we don't have any parameters. 1251 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1252 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1253 1254 // Delete the parameters. 1255 D.getTypeObject(0).Fun.freeArgs(); 1256 } 1257 1258 // Make sure the destructor isn't variadic. 1259 if (R->getAsFunctionProtoType()->isVariadic()) 1260 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1261 1262 // Rebuild the function type "R" without any type qualifiers or 1263 // parameters (in case any of the errors above fired) and with 1264 // "void" as the return type, since destructors don't have return 1265 // types. We *always* have to do this, because GetTypeForDeclarator 1266 // will put in a result type of "int" when none was specified. 1267 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1268 1269 return isInvalid; 1270} 1271 1272/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1273/// well-formednes of the conversion function declarator @p D with 1274/// type @p R. If there are any errors in the declarator, this routine 1275/// will emit diagnostics and return true. Otherwise, it will return 1276/// false. Either way, the type @p R will be updated to reflect a 1277/// well-formed type for the conversion operator. 1278bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1279 FunctionDecl::StorageClass& SC) { 1280 bool isInvalid = false; 1281 1282 // C++ [class.conv.fct]p1: 1283 // Neither parameter types nor return type can be specified. The 1284 // type of a conversion function (8.3.5) is “function taking no 1285 // parameter returning conversion-type-id.” 1286 if (SC == FunctionDecl::Static) { 1287 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1288 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1289 << SourceRange(D.getIdentifierLoc()); 1290 isInvalid = true; 1291 SC = FunctionDecl::None; 1292 } 1293 if (D.getDeclSpec().hasTypeSpecifier()) { 1294 // Conversion functions don't have return types, but the parser will 1295 // happily parse something like: 1296 // 1297 // class X { 1298 // float operator bool(); 1299 // }; 1300 // 1301 // The return type will be changed later anyway. 1302 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1303 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1304 << SourceRange(D.getIdentifierLoc()); 1305 } 1306 1307 // Make sure we don't have any parameters. 1308 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1309 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1310 1311 // Delete the parameters. 1312 D.getTypeObject(0).Fun.freeArgs(); 1313 } 1314 1315 // Make sure the conversion function isn't variadic. 1316 if (R->getAsFunctionProtoType()->isVariadic()) 1317 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1318 1319 // C++ [class.conv.fct]p4: 1320 // The conversion-type-id shall not represent a function type nor 1321 // an array type. 1322 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1323 if (ConvType->isArrayType()) { 1324 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1325 ConvType = Context.getPointerType(ConvType); 1326 } else if (ConvType->isFunctionType()) { 1327 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1328 ConvType = Context.getPointerType(ConvType); 1329 } 1330 1331 // Rebuild the function type "R" without any parameters (in case any 1332 // of the errors above fired) and with the conversion type as the 1333 // return type. 1334 R = Context.getFunctionType(ConvType, 0, 0, false, 1335 R->getAsFunctionProtoType()->getTypeQuals()); 1336 1337 // C++0x explicit conversion operators. 1338 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1339 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1340 diag::warn_explicit_conversion_functions) 1341 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1342 1343 return isInvalid; 1344} 1345 1346/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1347/// the declaration of the given C++ conversion function. This routine 1348/// is responsible for recording the conversion function in the C++ 1349/// class, if possible. 1350Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1351 assert(Conversion && "Expected to receive a conversion function declaration"); 1352 1353 // Set the lexical context of this conversion function 1354 Conversion->setLexicalDeclContext(CurContext); 1355 1356 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1357 1358 // Make sure we aren't redeclaring the conversion function. 1359 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1360 1361 // C++ [class.conv.fct]p1: 1362 // [...] A conversion function is never used to convert a 1363 // (possibly cv-qualified) object to the (possibly cv-qualified) 1364 // same object type (or a reference to it), to a (possibly 1365 // cv-qualified) base class of that type (or a reference to it), 1366 // or to (possibly cv-qualified) void. 1367 // FIXME: Suppress this warning if the conversion function ends up 1368 // being a virtual function that overrides a virtual function in a 1369 // base class. 1370 QualType ClassType 1371 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1372 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1373 ConvType = ConvTypeRef->getPointeeType(); 1374 if (ConvType->isRecordType()) { 1375 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1376 if (ConvType == ClassType) 1377 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1378 << ClassType; 1379 else if (IsDerivedFrom(ClassType, ConvType)) 1380 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1381 << ClassType << ConvType; 1382 } else if (ConvType->isVoidType()) { 1383 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1384 << ClassType << ConvType; 1385 } 1386 1387 if (Conversion->getPreviousDeclaration()) { 1388 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1389 for (OverloadedFunctionDecl::function_iterator 1390 Conv = Conversions->function_begin(), 1391 ConvEnd = Conversions->function_end(); 1392 Conv != ConvEnd; ++Conv) { 1393 if (*Conv == Conversion->getPreviousDeclaration()) { 1394 *Conv = Conversion; 1395 return (DeclTy *)Conversion; 1396 } 1397 } 1398 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1399 } else 1400 ClassDecl->addConversionFunction(Context, Conversion); 1401 1402 return (DeclTy *)Conversion; 1403} 1404 1405//===----------------------------------------------------------------------===// 1406// Namespace Handling 1407//===----------------------------------------------------------------------===// 1408 1409/// ActOnStartNamespaceDef - This is called at the start of a namespace 1410/// definition. 1411Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1412 SourceLocation IdentLoc, 1413 IdentifierInfo *II, 1414 SourceLocation LBrace) { 1415 NamespaceDecl *Namespc = 1416 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1417 Namespc->setLBracLoc(LBrace); 1418 1419 Scope *DeclRegionScope = NamespcScope->getParent(); 1420 1421 if (II) { 1422 // C++ [namespace.def]p2: 1423 // The identifier in an original-namespace-definition shall not have been 1424 // previously defined in the declarative region in which the 1425 // original-namespace-definition appears. The identifier in an 1426 // original-namespace-definition is the name of the namespace. Subsequently 1427 // in that declarative region, it is treated as an original-namespace-name. 1428 1429 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1430 true); 1431 1432 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1433 // This is an extended namespace definition. 1434 // Attach this namespace decl to the chain of extended namespace 1435 // definitions. 1436 OrigNS->setNextNamespace(Namespc); 1437 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1438 1439 // Remove the previous declaration from the scope. 1440 if (DeclRegionScope->isDeclScope(OrigNS)) { 1441 IdResolver.RemoveDecl(OrigNS); 1442 DeclRegionScope->RemoveDecl(OrigNS); 1443 } 1444 } else if (PrevDecl) { 1445 // This is an invalid name redefinition. 1446 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1447 << Namespc->getDeclName(); 1448 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1449 Namespc->setInvalidDecl(); 1450 // Continue on to push Namespc as current DeclContext and return it. 1451 } 1452 1453 PushOnScopeChains(Namespc, DeclRegionScope); 1454 } else { 1455 // FIXME: Handle anonymous namespaces 1456 } 1457 1458 // Although we could have an invalid decl (i.e. the namespace name is a 1459 // redefinition), push it as current DeclContext and try to continue parsing. 1460 // FIXME: We should be able to push Namespc here, so that the 1461 // each DeclContext for the namespace has the declarations 1462 // that showed up in that particular namespace definition. 1463 PushDeclContext(NamespcScope, Namespc); 1464 return Namespc; 1465} 1466 1467/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1468/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1469void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1470 Decl *Dcl = static_cast<Decl *>(D); 1471 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1472 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1473 Namespc->setRBracLoc(RBrace); 1474 PopDeclContext(); 1475} 1476 1477Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1478 SourceLocation UsingLoc, 1479 SourceLocation NamespcLoc, 1480 const CXXScopeSpec &SS, 1481 SourceLocation IdentLoc, 1482 IdentifierInfo *NamespcName, 1483 AttributeList *AttrList) { 1484 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1485 assert(NamespcName && "Invalid NamespcName."); 1486 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1487 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1488 1489 UsingDirectiveDecl *UDir = 0; 1490 1491 // Lookup namespace name. 1492 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1493 LookupNamespaceName, false); 1494 if (R.isAmbiguous()) { 1495 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1496 return 0; 1497 } 1498 if (NamedDecl *NS = R) { 1499 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1500 // C++ [namespace.udir]p1: 1501 // A using-directive specifies that the names in the nominated 1502 // namespace can be used in the scope in which the 1503 // using-directive appears after the using-directive. During 1504 // unqualified name lookup (3.4.1), the names appear as if they 1505 // were declared in the nearest enclosing namespace which 1506 // contains both the using-directive and the nominated 1507 // namespace. [Note: in this context, “contains” means “contains 1508 // directly or indirectly”. ] 1509 1510 // Find enclosing context containing both using-directive and 1511 // nominated namespace. 1512 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1513 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1514 CommonAncestor = CommonAncestor->getParent(); 1515 1516 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1517 NamespcLoc, IdentLoc, 1518 cast<NamespaceDecl>(NS), 1519 CommonAncestor); 1520 PushUsingDirective(S, UDir); 1521 } else { 1522 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1523 } 1524 1525 // FIXME: We ignore attributes for now. 1526 delete AttrList; 1527 return UDir; 1528} 1529 1530void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1531 // If scope has associated entity, then using directive is at namespace 1532 // or translation unit scope. We add UsingDirectiveDecls, into 1533 // it's lookup structure. 1534 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1535 Ctx->addDecl(UDir); 1536 else 1537 // Otherwise it is block-sope. using-directives will affect lookup 1538 // only to the end of scope. 1539 S->PushUsingDirective(UDir); 1540} 1541 1542/// AddCXXDirectInitializerToDecl - This action is called immediately after 1543/// ActOnDeclarator, when a C++ direct initializer is present. 1544/// e.g: "int x(1);" 1545void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1546 ExprTy **ExprTys, unsigned NumExprs, 1547 SourceLocation *CommaLocs, 1548 SourceLocation RParenLoc) { 1549 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1550 Decl *RealDecl = static_cast<Decl *>(Dcl); 1551 1552 // If there is no declaration, there was an error parsing it. Just ignore 1553 // the initializer. 1554 if (RealDecl == 0) { 1555 for (unsigned i = 0; i != NumExprs; ++i) 1556 static_cast<Expr *>(ExprTys[i])->Destroy(Context); 1557 return; 1558 } 1559 1560 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1561 if (!VDecl) { 1562 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1563 RealDecl->setInvalidDecl(); 1564 return; 1565 } 1566 1567 // We will treat direct-initialization as a copy-initialization: 1568 // int x(1); -as-> int x = 1; 1569 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1570 // 1571 // Clients that want to distinguish between the two forms, can check for 1572 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1573 // A major benefit is that clients that don't particularly care about which 1574 // exactly form was it (like the CodeGen) can handle both cases without 1575 // special case code. 1576 1577 // C++ 8.5p11: 1578 // The form of initialization (using parentheses or '=') is generally 1579 // insignificant, but does matter when the entity being initialized has a 1580 // class type. 1581 QualType DeclInitType = VDecl->getType(); 1582 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1583 DeclInitType = Array->getElementType(); 1584 1585 if (VDecl->getType()->isRecordType()) { 1586 CXXConstructorDecl *Constructor 1587 = PerformInitializationByConstructor(DeclInitType, 1588 (Expr **)ExprTys, NumExprs, 1589 VDecl->getLocation(), 1590 SourceRange(VDecl->getLocation(), 1591 RParenLoc), 1592 VDecl->getDeclName(), 1593 IK_Direct); 1594 if (!Constructor) { 1595 RealDecl->setInvalidDecl(); 1596 } 1597 1598 // Let clients know that initialization was done with a direct 1599 // initializer. 1600 VDecl->setCXXDirectInitializer(true); 1601 1602 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1603 // the initializer. 1604 return; 1605 } 1606 1607 if (NumExprs > 1) { 1608 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1609 << SourceRange(VDecl->getLocation(), RParenLoc); 1610 RealDecl->setInvalidDecl(); 1611 return; 1612 } 1613 1614 // Let clients know that initialization was done with a direct initializer. 1615 VDecl->setCXXDirectInitializer(true); 1616 1617 assert(NumExprs == 1 && "Expected 1 expression"); 1618 // Set the init expression, handles conversions. 1619 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1620} 1621 1622/// PerformInitializationByConstructor - Perform initialization by 1623/// constructor (C++ [dcl.init]p14), which may occur as part of 1624/// direct-initialization or copy-initialization. We are initializing 1625/// an object of type @p ClassType with the given arguments @p 1626/// Args. @p Loc is the location in the source code where the 1627/// initializer occurs (e.g., a declaration, member initializer, 1628/// functional cast, etc.) while @p Range covers the whole 1629/// initialization. @p InitEntity is the entity being initialized, 1630/// which may by the name of a declaration or a type. @p Kind is the 1631/// kind of initialization we're performing, which affects whether 1632/// explicit constructors will be considered. When successful, returns 1633/// the constructor that will be used to perform the initialization; 1634/// when the initialization fails, emits a diagnostic and returns 1635/// null. 1636CXXConstructorDecl * 1637Sema::PerformInitializationByConstructor(QualType ClassType, 1638 Expr **Args, unsigned NumArgs, 1639 SourceLocation Loc, SourceRange Range, 1640 DeclarationName InitEntity, 1641 InitializationKind Kind) { 1642 const RecordType *ClassRec = ClassType->getAsRecordType(); 1643 assert(ClassRec && "Can only initialize a class type here"); 1644 1645 // C++ [dcl.init]p14: 1646 // 1647 // If the initialization is direct-initialization, or if it is 1648 // copy-initialization where the cv-unqualified version of the 1649 // source type is the same class as, or a derived class of, the 1650 // class of the destination, constructors are considered. The 1651 // applicable constructors are enumerated (13.3.1.3), and the 1652 // best one is chosen through overload resolution (13.3). The 1653 // constructor so selected is called to initialize the object, 1654 // with the initializer expression(s) as its argument(s). If no 1655 // constructor applies, or the overload resolution is ambiguous, 1656 // the initialization is ill-formed. 1657 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1658 OverloadCandidateSet CandidateSet; 1659 1660 // Add constructors to the overload set. 1661 DeclarationName ConstructorName 1662 = Context.DeclarationNames.getCXXConstructorName( 1663 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1664 DeclContext::lookup_const_iterator Con, ConEnd; 1665 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1666 Con != ConEnd; ++Con) { 1667 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1668 if ((Kind == IK_Direct) || 1669 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1670 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1671 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1672 } 1673 1674 // FIXME: When we decide not to synthesize the implicitly-declared 1675 // constructors, we'll need to make them appear here. 1676 1677 OverloadCandidateSet::iterator Best; 1678 switch (BestViableFunction(CandidateSet, Best)) { 1679 case OR_Success: 1680 // We found a constructor. Return it. 1681 return cast<CXXConstructorDecl>(Best->Function); 1682 1683 case OR_No_Viable_Function: 1684 if (InitEntity) 1685 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1686 << InitEntity << Range; 1687 else 1688 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1689 << ClassType << Range; 1690 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1691 return 0; 1692 1693 case OR_Ambiguous: 1694 if (InitEntity) 1695 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1696 else 1697 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1698 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1699 return 0; 1700 1701 case OR_Deleted: 1702 if (InitEntity) 1703 Diag(Loc, diag::err_ovl_deleted_init) 1704 << Best->Function->isDeleted() 1705 << InitEntity << Range; 1706 else 1707 Diag(Loc, diag::err_ovl_deleted_init) 1708 << Best->Function->isDeleted() 1709 << InitEntity << Range; 1710 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1711 return 0; 1712 } 1713 1714 return 0; 1715} 1716 1717/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1718/// determine whether they are reference-related, 1719/// reference-compatible, reference-compatible with added 1720/// qualification, or incompatible, for use in C++ initialization by 1721/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1722/// type, and the first type (T1) is the pointee type of the reference 1723/// type being initialized. 1724Sema::ReferenceCompareResult 1725Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1726 bool& DerivedToBase) { 1727 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1728 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1729 1730 T1 = Context.getCanonicalType(T1); 1731 T2 = Context.getCanonicalType(T2); 1732 QualType UnqualT1 = T1.getUnqualifiedType(); 1733 QualType UnqualT2 = T2.getUnqualifiedType(); 1734 1735 // C++ [dcl.init.ref]p4: 1736 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1737 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1738 // T1 is a base class of T2. 1739 if (UnqualT1 == UnqualT2) 1740 DerivedToBase = false; 1741 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1742 DerivedToBase = true; 1743 else 1744 return Ref_Incompatible; 1745 1746 // At this point, we know that T1 and T2 are reference-related (at 1747 // least). 1748 1749 // C++ [dcl.init.ref]p4: 1750 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1751 // reference-related to T2 and cv1 is the same cv-qualification 1752 // as, or greater cv-qualification than, cv2. For purposes of 1753 // overload resolution, cases for which cv1 is greater 1754 // cv-qualification than cv2 are identified as 1755 // reference-compatible with added qualification (see 13.3.3.2). 1756 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1757 return Ref_Compatible; 1758 else if (T1.isMoreQualifiedThan(T2)) 1759 return Ref_Compatible_With_Added_Qualification; 1760 else 1761 return Ref_Related; 1762} 1763 1764/// CheckReferenceInit - Check the initialization of a reference 1765/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1766/// the initializer (either a simple initializer or an initializer 1767/// list), and DeclType is the type of the declaration. When ICS is 1768/// non-null, this routine will compute the implicit conversion 1769/// sequence according to C++ [over.ics.ref] and will not produce any 1770/// diagnostics; when ICS is null, it will emit diagnostics when any 1771/// errors are found. Either way, a return value of true indicates 1772/// that there was a failure, a return value of false indicates that 1773/// the reference initialization succeeded. 1774/// 1775/// When @p SuppressUserConversions, user-defined conversions are 1776/// suppressed. 1777/// When @p AllowExplicit, we also permit explicit user-defined 1778/// conversion functions. 1779bool 1780Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1781 ImplicitConversionSequence *ICS, 1782 bool SuppressUserConversions, 1783 bool AllowExplicit) { 1784 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1785 1786 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1787 QualType T2 = Init->getType(); 1788 1789 // If the initializer is the address of an overloaded function, try 1790 // to resolve the overloaded function. If all goes well, T2 is the 1791 // type of the resulting function. 1792 if (T2->isOverloadType()) { 1793 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1794 ICS != 0); 1795 if (Fn) { 1796 // Since we're performing this reference-initialization for 1797 // real, update the initializer with the resulting function. 1798 if (!ICS) { 1799 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 1800 return true; 1801 1802 FixOverloadedFunctionReference(Init, Fn); 1803 } 1804 1805 T2 = Fn->getType(); 1806 } 1807 } 1808 1809 // Compute some basic properties of the types and the initializer. 1810 bool DerivedToBase = false; 1811 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1812 ReferenceCompareResult RefRelationship 1813 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1814 1815 // Most paths end in a failed conversion. 1816 if (ICS) 1817 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1818 1819 // C++ [dcl.init.ref]p5: 1820 // A reference to type “cv1 T1” is initialized by an expression 1821 // of type “cv2 T2” as follows: 1822 1823 // -- If the initializer expression 1824 1825 bool BindsDirectly = false; 1826 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1827 // reference-compatible with “cv2 T2,” or 1828 // 1829 // Note that the bit-field check is skipped if we are just computing 1830 // the implicit conversion sequence (C++ [over.best.ics]p2). 1831 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1832 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1833 BindsDirectly = true; 1834 1835 if (ICS) { 1836 // C++ [over.ics.ref]p1: 1837 // When a parameter of reference type binds directly (8.5.3) 1838 // to an argument expression, the implicit conversion sequence 1839 // is the identity conversion, unless the argument expression 1840 // has a type that is a derived class of the parameter type, 1841 // in which case the implicit conversion sequence is a 1842 // derived-to-base Conversion (13.3.3.1). 1843 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1844 ICS->Standard.First = ICK_Identity; 1845 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1846 ICS->Standard.Third = ICK_Identity; 1847 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1848 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1849 ICS->Standard.ReferenceBinding = true; 1850 ICS->Standard.DirectBinding = true; 1851 1852 // Nothing more to do: the inaccessibility/ambiguity check for 1853 // derived-to-base conversions is suppressed when we're 1854 // computing the implicit conversion sequence (C++ 1855 // [over.best.ics]p2). 1856 return false; 1857 } else { 1858 // Perform the conversion. 1859 // FIXME: Binding to a subobject of the lvalue is going to require 1860 // more AST annotation than this. 1861 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1862 } 1863 } 1864 1865 // -- has a class type (i.e., T2 is a class type) and can be 1866 // implicitly converted to an lvalue of type “cv3 T3,” 1867 // where “cv1 T1” is reference-compatible with “cv3 T3” 1868 // 92) (this conversion is selected by enumerating the 1869 // applicable conversion functions (13.3.1.6) and choosing 1870 // the best one through overload resolution (13.3)), 1871 if (!SuppressUserConversions && T2->isRecordType()) { 1872 // FIXME: Look for conversions in base classes! 1873 CXXRecordDecl *T2RecordDecl 1874 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1875 1876 OverloadCandidateSet CandidateSet; 1877 OverloadedFunctionDecl *Conversions 1878 = T2RecordDecl->getConversionFunctions(); 1879 for (OverloadedFunctionDecl::function_iterator Func 1880 = Conversions->function_begin(); 1881 Func != Conversions->function_end(); ++Func) { 1882 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1883 1884 // If the conversion function doesn't return a reference type, 1885 // it can't be considered for this conversion. 1886 // FIXME: This will change when we support rvalue references. 1887 if (Conv->getConversionType()->isReferenceType() && 1888 (AllowExplicit || !Conv->isExplicit())) 1889 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1890 } 1891 1892 OverloadCandidateSet::iterator Best; 1893 switch (BestViableFunction(CandidateSet, Best)) { 1894 case OR_Success: 1895 // This is a direct binding. 1896 BindsDirectly = true; 1897 1898 if (ICS) { 1899 // C++ [over.ics.ref]p1: 1900 // 1901 // [...] If the parameter binds directly to the result of 1902 // applying a conversion function to the argument 1903 // expression, the implicit conversion sequence is a 1904 // user-defined conversion sequence (13.3.3.1.2), with the 1905 // second standard conversion sequence either an identity 1906 // conversion or, if the conversion function returns an 1907 // entity of a type that is a derived class of the parameter 1908 // type, a derived-to-base Conversion. 1909 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1910 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1911 ICS->UserDefined.After = Best->FinalConversion; 1912 ICS->UserDefined.ConversionFunction = Best->Function; 1913 assert(ICS->UserDefined.After.ReferenceBinding && 1914 ICS->UserDefined.After.DirectBinding && 1915 "Expected a direct reference binding!"); 1916 return false; 1917 } else { 1918 // Perform the conversion. 1919 // FIXME: Binding to a subobject of the lvalue is going to require 1920 // more AST annotation than this. 1921 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1922 } 1923 break; 1924 1925 case OR_Ambiguous: 1926 assert(false && "Ambiguous reference binding conversions not implemented."); 1927 return true; 1928 1929 case OR_No_Viable_Function: 1930 case OR_Deleted: 1931 // There was no suitable conversion, or we found a deleted 1932 // conversion; continue with other checks. 1933 break; 1934 } 1935 } 1936 1937 if (BindsDirectly) { 1938 // C++ [dcl.init.ref]p4: 1939 // [...] In all cases where the reference-related or 1940 // reference-compatible relationship of two types is used to 1941 // establish the validity of a reference binding, and T1 is a 1942 // base class of T2, a program that necessitates such a binding 1943 // is ill-formed if T1 is an inaccessible (clause 11) or 1944 // ambiguous (10.2) base class of T2. 1945 // 1946 // Note that we only check this condition when we're allowed to 1947 // complain about errors, because we should not be checking for 1948 // ambiguity (or inaccessibility) unless the reference binding 1949 // actually happens. 1950 if (DerivedToBase) 1951 return CheckDerivedToBaseConversion(T2, T1, 1952 Init->getSourceRange().getBegin(), 1953 Init->getSourceRange()); 1954 else 1955 return false; 1956 } 1957 1958 // -- Otherwise, the reference shall be to a non-volatile const 1959 // type (i.e., cv1 shall be const). 1960 if (T1.getCVRQualifiers() != QualType::Const) { 1961 if (!ICS) 1962 Diag(Init->getSourceRange().getBegin(), 1963 diag::err_not_reference_to_const_init) 1964 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1965 << T2 << Init->getSourceRange(); 1966 return true; 1967 } 1968 1969 // -- If the initializer expression is an rvalue, with T2 a 1970 // class type, and “cv1 T1” is reference-compatible with 1971 // “cv2 T2,” the reference is bound in one of the 1972 // following ways (the choice is implementation-defined): 1973 // 1974 // -- The reference is bound to the object represented by 1975 // the rvalue (see 3.10) or to a sub-object within that 1976 // object. 1977 // 1978 // -- A temporary of type “cv1 T2” [sic] is created, and 1979 // a constructor is called to copy the entire rvalue 1980 // object into the temporary. The reference is bound to 1981 // the temporary or to a sub-object within the 1982 // temporary. 1983 // 1984 // The constructor that would be used to make the copy 1985 // shall be callable whether or not the copy is actually 1986 // done. 1987 // 1988 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1989 // freedom, so we will always take the first option and never build 1990 // a temporary in this case. FIXME: We will, however, have to check 1991 // for the presence of a copy constructor in C++98/03 mode. 1992 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1993 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1994 if (ICS) { 1995 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1996 ICS->Standard.First = ICK_Identity; 1997 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1998 ICS->Standard.Third = ICK_Identity; 1999 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2000 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2001 ICS->Standard.ReferenceBinding = true; 2002 ICS->Standard.DirectBinding = false; 2003 } else { 2004 // FIXME: Binding to a subobject of the rvalue is going to require 2005 // more AST annotation than this. 2006 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2007 } 2008 return false; 2009 } 2010 2011 // -- Otherwise, a temporary of type “cv1 T1” is created and 2012 // initialized from the initializer expression using the 2013 // rules for a non-reference copy initialization (8.5). The 2014 // reference is then bound to the temporary. If T1 is 2015 // reference-related to T2, cv1 must be the same 2016 // cv-qualification as, or greater cv-qualification than, 2017 // cv2; otherwise, the program is ill-formed. 2018 if (RefRelationship == Ref_Related) { 2019 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2020 // we would be reference-compatible or reference-compatible with 2021 // added qualification. But that wasn't the case, so the reference 2022 // initialization fails. 2023 if (!ICS) 2024 Diag(Init->getSourceRange().getBegin(), 2025 diag::err_reference_init_drops_quals) 2026 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2027 << T2 << Init->getSourceRange(); 2028 return true; 2029 } 2030 2031 // If at least one of the types is a class type, the types are not 2032 // related, and we aren't allowed any user conversions, the 2033 // reference binding fails. This case is important for breaking 2034 // recursion, since TryImplicitConversion below will attempt to 2035 // create a temporary through the use of a copy constructor. 2036 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2037 (T1->isRecordType() || T2->isRecordType())) { 2038 if (!ICS) 2039 Diag(Init->getSourceRange().getBegin(), 2040 diag::err_typecheck_convert_incompatible) 2041 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2042 return true; 2043 } 2044 2045 // Actually try to convert the initializer to T1. 2046 if (ICS) { 2047 /// C++ [over.ics.ref]p2: 2048 /// 2049 /// When a parameter of reference type is not bound directly to 2050 /// an argument expression, the conversion sequence is the one 2051 /// required to convert the argument expression to the 2052 /// underlying type of the reference according to 2053 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 2054 /// to copy-initializing a temporary of the underlying type with 2055 /// the argument expression. Any difference in top-level 2056 /// cv-qualification is subsumed by the initialization itself 2057 /// and does not constitute a conversion. 2058 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2059 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2060 } else { 2061 return PerformImplicitConversion(Init, T1, "initializing"); 2062 } 2063} 2064 2065/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2066/// of this overloaded operator is well-formed. If so, returns false; 2067/// otherwise, emits appropriate diagnostics and returns true. 2068bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2069 assert(FnDecl && FnDecl->isOverloadedOperator() && 2070 "Expected an overloaded operator declaration"); 2071 2072 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2073 2074 // C++ [over.oper]p5: 2075 // The allocation and deallocation functions, operator new, 2076 // operator new[], operator delete and operator delete[], are 2077 // described completely in 3.7.3. The attributes and restrictions 2078 // found in the rest of this subclause do not apply to them unless 2079 // explicitly stated in 3.7.3. 2080 // FIXME: Write a separate routine for checking this. For now, just 2081 // allow it. 2082 if (Op == OO_New || Op == OO_Array_New || 2083 Op == OO_Delete || Op == OO_Array_Delete) 2084 return false; 2085 2086 // C++ [over.oper]p6: 2087 // An operator function shall either be a non-static member 2088 // function or be a non-member function and have at least one 2089 // parameter whose type is a class, a reference to a class, an 2090 // enumeration, or a reference to an enumeration. 2091 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2092 if (MethodDecl->isStatic()) 2093 return Diag(FnDecl->getLocation(), 2094 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2095 } else { 2096 bool ClassOrEnumParam = false; 2097 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2098 ParamEnd = FnDecl->param_end(); 2099 Param != ParamEnd; ++Param) { 2100 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2101 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2102 ClassOrEnumParam = true; 2103 break; 2104 } 2105 } 2106 2107 if (!ClassOrEnumParam) 2108 return Diag(FnDecl->getLocation(), 2109 diag::err_operator_overload_needs_class_or_enum) 2110 << FnDecl->getDeclName(); 2111 } 2112 2113 // C++ [over.oper]p8: 2114 // An operator function cannot have default arguments (8.3.6), 2115 // except where explicitly stated below. 2116 // 2117 // Only the function-call operator allows default arguments 2118 // (C++ [over.call]p1). 2119 if (Op != OO_Call) { 2120 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2121 Param != FnDecl->param_end(); ++Param) { 2122 if ((*Param)->hasUnparsedDefaultArg()) 2123 return Diag((*Param)->getLocation(), 2124 diag::err_operator_overload_default_arg) 2125 << FnDecl->getDeclName(); 2126 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2127 return Diag((*Param)->getLocation(), 2128 diag::err_operator_overload_default_arg) 2129 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2130 } 2131 } 2132 2133 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2134 { false, false, false } 2135#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2136 , { Unary, Binary, MemberOnly } 2137#include "clang/Basic/OperatorKinds.def" 2138 }; 2139 2140 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2141 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2142 bool MustBeMemberOperator = OperatorUses[Op][2]; 2143 2144 // C++ [over.oper]p8: 2145 // [...] Operator functions cannot have more or fewer parameters 2146 // than the number required for the corresponding operator, as 2147 // described in the rest of this subclause. 2148 unsigned NumParams = FnDecl->getNumParams() 2149 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2150 if (Op != OO_Call && 2151 ((NumParams == 1 && !CanBeUnaryOperator) || 2152 (NumParams == 2 && !CanBeBinaryOperator) || 2153 (NumParams < 1) || (NumParams > 2))) { 2154 // We have the wrong number of parameters. 2155 unsigned ErrorKind; 2156 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2157 ErrorKind = 2; // 2 -> unary or binary. 2158 } else if (CanBeUnaryOperator) { 2159 ErrorKind = 0; // 0 -> unary 2160 } else { 2161 assert(CanBeBinaryOperator && 2162 "All non-call overloaded operators are unary or binary!"); 2163 ErrorKind = 1; // 1 -> binary 2164 } 2165 2166 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2167 << FnDecl->getDeclName() << NumParams << ErrorKind; 2168 } 2169 2170 // Overloaded operators other than operator() cannot be variadic. 2171 if (Op != OO_Call && 2172 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2173 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2174 << FnDecl->getDeclName(); 2175 } 2176 2177 // Some operators must be non-static member functions. 2178 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2179 return Diag(FnDecl->getLocation(), 2180 diag::err_operator_overload_must_be_member) 2181 << FnDecl->getDeclName(); 2182 } 2183 2184 // C++ [over.inc]p1: 2185 // The user-defined function called operator++ implements the 2186 // prefix and postfix ++ operator. If this function is a member 2187 // function with no parameters, or a non-member function with one 2188 // parameter of class or enumeration type, it defines the prefix 2189 // increment operator ++ for objects of that type. If the function 2190 // is a member function with one parameter (which shall be of type 2191 // int) or a non-member function with two parameters (the second 2192 // of which shall be of type int), it defines the postfix 2193 // increment operator ++ for objects of that type. 2194 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2195 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2196 bool ParamIsInt = false; 2197 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2198 ParamIsInt = BT->getKind() == BuiltinType::Int; 2199 2200 if (!ParamIsInt) 2201 return Diag(LastParam->getLocation(), 2202 diag::err_operator_overload_post_incdec_must_be_int) 2203 << LastParam->getType() << (Op == OO_MinusMinus); 2204 } 2205 2206 // Notify the class if it got an assignment operator. 2207 if (Op == OO_Equal) { 2208 // Would have returned earlier otherwise. 2209 assert(isa<CXXMethodDecl>(FnDecl) && 2210 "Overloaded = not member, but not filtered."); 2211 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2212 Method->getParent()->addedAssignmentOperator(Context, Method); 2213 } 2214 2215 return false; 2216} 2217 2218/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2219/// linkage specification, including the language and (if present) 2220/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2221/// the location of the language string literal, which is provided 2222/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2223/// the '{' brace. Otherwise, this linkage specification does not 2224/// have any braces. 2225Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2226 SourceLocation ExternLoc, 2227 SourceLocation LangLoc, 2228 const char *Lang, 2229 unsigned StrSize, 2230 SourceLocation LBraceLoc) { 2231 LinkageSpecDecl::LanguageIDs Language; 2232 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2233 Language = LinkageSpecDecl::lang_c; 2234 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2235 Language = LinkageSpecDecl::lang_cxx; 2236 else { 2237 Diag(LangLoc, diag::err_bad_language); 2238 return 0; 2239 } 2240 2241 // FIXME: Add all the various semantics of linkage specifications 2242 2243 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2244 LangLoc, Language, 2245 LBraceLoc.isValid()); 2246 CurContext->addDecl(D); 2247 PushDeclContext(S, D); 2248 return D; 2249} 2250 2251/// ActOnFinishLinkageSpecification - Completely the definition of 2252/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2253/// valid, it's the position of the closing '}' brace in a linkage 2254/// specification that uses braces. 2255Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2256 DeclTy *LinkageSpec, 2257 SourceLocation RBraceLoc) { 2258 if (LinkageSpec) 2259 PopDeclContext(); 2260 return LinkageSpec; 2261} 2262 2263/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2264/// handler. 2265Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2266{ 2267 QualType ExDeclType = GetTypeForDeclarator(D, S); 2268 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2269 2270 bool Invalid = false; 2271 2272 // Arrays and functions decay. 2273 if (ExDeclType->isArrayType()) 2274 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2275 else if (ExDeclType->isFunctionType()) 2276 ExDeclType = Context.getPointerType(ExDeclType); 2277 2278 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2279 // The exception-declaration shall not denote a pointer or reference to an 2280 // incomplete type, other than [cv] void*. 2281 QualType BaseType = ExDeclType; 2282 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2283 unsigned DK = diag::err_catch_incomplete; 2284 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2285 BaseType = Ptr->getPointeeType(); 2286 Mode = 1; 2287 DK = diag::err_catch_incomplete_ptr; 2288 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2289 BaseType = Ref->getPointeeType(); 2290 Mode = 2; 2291 DK = diag::err_catch_incomplete_ref; 2292 } 2293 if ((Mode == 0 || !BaseType->isVoidType()) && 2294 DiagnoseIncompleteType(Begin, BaseType, DK)) 2295 Invalid = true; 2296 2297 // FIXME: Need to test for ability to copy-construct and destroy the 2298 // exception variable. 2299 // FIXME: Need to check for abstract classes. 2300 2301 IdentifierInfo *II = D.getIdentifier(); 2302 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2303 // The scope should be freshly made just for us. There is just no way 2304 // it contains any previous declaration. 2305 assert(!S->isDeclScope(PrevDecl)); 2306 if (PrevDecl->isTemplateParameter()) { 2307 // Maybe we will complain about the shadowed template parameter. 2308 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2309 2310 } 2311 } 2312 2313 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2314 II, ExDeclType, VarDecl::None, Begin); 2315 if (D.getInvalidType() || Invalid) 2316 ExDecl->setInvalidDecl(); 2317 2318 if (D.getCXXScopeSpec().isSet()) { 2319 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2320 << D.getCXXScopeSpec().getRange(); 2321 ExDecl->setInvalidDecl(); 2322 } 2323 2324 // Add the exception declaration into this scope. 2325 S->AddDecl(ExDecl); 2326 if (II) 2327 IdResolver.AddDecl(ExDecl); 2328 2329 ProcessDeclAttributes(ExDecl, D); 2330 return ExDecl; 2331} 2332