SemaDeclCXX.cpp revision aaba5e346dffdbad5d1c42765a89e4a7afb0da67
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 llvm::OwningPtr<Expr> DefaultArg((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. 205FunctionDecl * 206Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 207 // C++ [dcl.fct.default]p4: 208 // 209 // For non-template functions, default arguments can be added in 210 // later declarations of a function in the same 211 // scope. Declarations in different scopes have completely 212 // distinct sets of default arguments. That is, declarations in 213 // inner scopes do not acquire default arguments from 214 // declarations in outer scopes, and vice versa. In a given 215 // function declaration, all parameters subsequent to a 216 // parameter with a default argument shall have default 217 // arguments supplied in this or previous declarations. A 218 // default argument shall not be redefined by a later 219 // declaration (not even to the same value). 220 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 221 ParmVarDecl *OldParam = Old->getParamDecl(p); 222 ParmVarDecl *NewParam = New->getParamDecl(p); 223 224 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 225 Diag(NewParam->getLocation(), 226 diag::err_param_default_argument_redefinition) 227 << NewParam->getDefaultArg()->getSourceRange(); 228 Diag(OldParam->getLocation(), diag::note_previous_definition); 229 } else if (OldParam->getDefaultArg()) { 230 // Merge the old default argument into the new parameter 231 NewParam->setDefaultArg(OldParam->getDefaultArg()); 232 } 233 } 234 235 return New; 236} 237 238/// CheckCXXDefaultArguments - Verify that the default arguments for a 239/// function declaration are well-formed according to C++ 240/// [dcl.fct.default]. 241void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 242 unsigned NumParams = FD->getNumParams(); 243 unsigned p; 244 245 // Find first parameter with a default argument 246 for (p = 0; p < NumParams; ++p) { 247 ParmVarDecl *Param = FD->getParamDecl(p); 248 if (Param->getDefaultArg()) 249 break; 250 } 251 252 // C++ [dcl.fct.default]p4: 253 // In a given function declaration, all parameters 254 // subsequent to a parameter with a default argument shall 255 // have default arguments supplied in this or previous 256 // declarations. A default argument shall not be redefined 257 // by a later declaration (not even to the same value). 258 unsigned LastMissingDefaultArg = 0; 259 for(; p < NumParams; ++p) { 260 ParmVarDecl *Param = FD->getParamDecl(p); 261 if (!Param->getDefaultArg()) { 262 if (Param->isInvalidDecl()) 263 /* We already complained about this parameter. */; 264 else if (Param->getIdentifier()) 265 Diag(Param->getLocation(), 266 diag::err_param_default_argument_missing_name) 267 << Param->getIdentifier(); 268 else 269 Diag(Param->getLocation(), 270 diag::err_param_default_argument_missing); 271 272 LastMissingDefaultArg = p; 273 } 274 } 275 276 if (LastMissingDefaultArg > 0) { 277 // Some default arguments were missing. Clear out all of the 278 // default arguments up to (and including) the last missing 279 // default argument, so that we leave the function parameters 280 // in a semantically valid state. 281 for (p = 0; p <= LastMissingDefaultArg; ++p) { 282 ParmVarDecl *Param = FD->getParamDecl(p); 283 if (Param->getDefaultArg()) { 284 if (!Param->hasUnparsedDefaultArg()) 285 Param->getDefaultArg()->Destroy(Context); 286 Param->setDefaultArg(0); 287 } 288 } 289 } 290} 291 292/// isCurrentClassName - Determine whether the identifier II is the 293/// name of the class type currently being defined. In the case of 294/// nested classes, this will only return true if II is the name of 295/// the innermost class. 296bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 297 const CXXScopeSpec *SS) { 298 CXXRecordDecl *CurDecl; 299 if (SS) { 300 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 301 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 302 } else 303 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 304 305 if (CurDecl) 306 return &II == CurDecl->getIdentifier(); 307 else 308 return false; 309} 310 311/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 312/// one entry in the base class list of a class specifier, for 313/// example: 314/// class foo : public bar, virtual private baz { 315/// 'public bar' and 'virtual private baz' are each base-specifiers. 316Sema::BaseResult 317Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 318 bool Virtual, AccessSpecifier Access, 319 TypeTy *basetype, SourceLocation BaseLoc) { 320 CXXRecordDecl *Decl = (CXXRecordDecl*)classdecl; 321 QualType BaseType = Context.getTypeDeclType((TypeDecl*)basetype); 322 323 // Base specifiers must be record types. 324 if (!BaseType->isRecordType()) 325 return Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 326 327 // C++ [class.union]p1: 328 // A union shall not be used as a base class. 329 if (BaseType->isUnionType()) 330 return Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 331 332 // C++ [class.union]p1: 333 // A union shall not have base classes. 334 if (Decl->isUnion()) 335 return Diag(Decl->getLocation(), diag::err_base_clause_on_union) 336 << SpecifierRange; 337 338 // C++ [class.derived]p2: 339 // The class-name in a base-specifier shall not be an incompletely 340 // defined class. 341 if (DiagnoseIncompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 342 SpecifierRange)) 343 return true; 344 345 // If the base class is polymorphic, the new one is, too. 346 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 347 assert(BaseDecl && "Record type has no declaration"); 348 BaseDecl = BaseDecl->getDefinition(Context); 349 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 350 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 351 Decl->setPolymorphic(true); 352 353 // C++ [dcl.init.aggr]p1: 354 // An aggregate is [...] a class with [...] no base classes [...]. 355 Decl->setAggregate(false); 356 Decl->setPOD(false); 357 358 // Create the base specifier. 359 return new CXXBaseSpecifier(SpecifierRange, Virtual, 360 BaseType->isClassType(), Access, BaseType); 361} 362 363/// ActOnBaseSpecifiers - Attach the given base specifiers to the 364/// class, after checking whether there are any duplicate base 365/// classes. 366void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 367 unsigned NumBases) { 368 if (NumBases == 0) 369 return; 370 371 // Used to keep track of which base types we have already seen, so 372 // that we can properly diagnose redundant direct base types. Note 373 // that the key is always the unqualified canonical type of the base 374 // class. 375 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 376 377 // Copy non-redundant base specifiers into permanent storage. 378 CXXBaseSpecifier **BaseSpecs = (CXXBaseSpecifier **)Bases; 379 unsigned NumGoodBases = 0; 380 for (unsigned idx = 0; idx < NumBases; ++idx) { 381 QualType NewBaseType 382 = Context.getCanonicalType(BaseSpecs[idx]->getType()); 383 NewBaseType = NewBaseType.getUnqualifiedType(); 384 385 if (KnownBaseTypes[NewBaseType]) { 386 // C++ [class.mi]p3: 387 // A class shall not be specified as a direct base class of a 388 // derived class more than once. 389 Diag(BaseSpecs[idx]->getSourceRange().getBegin(), 390 diag::err_duplicate_base_class) 391 << KnownBaseTypes[NewBaseType]->getType() 392 << BaseSpecs[idx]->getSourceRange(); 393 394 // Delete the duplicate base class specifier; we're going to 395 // overwrite its pointer later. 396 delete BaseSpecs[idx]; 397 } else { 398 // Okay, add this new base class. 399 KnownBaseTypes[NewBaseType] = BaseSpecs[idx]; 400 BaseSpecs[NumGoodBases++] = BaseSpecs[idx]; 401 } 402 } 403 404 // Attach the remaining base class specifiers to the derived class. 405 CXXRecordDecl *Decl = (CXXRecordDecl*)ClassDecl; 406 Decl->setBases(BaseSpecs, NumGoodBases); 407 408 // Delete the remaining (good) base class specifiers, since their 409 // data has been copied into the CXXRecordDecl. 410 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 411 delete BaseSpecs[idx]; 412} 413 414//===----------------------------------------------------------------------===// 415// C++ class member Handling 416//===----------------------------------------------------------------------===// 417 418/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 419/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 420/// bitfield width if there is one and 'InitExpr' specifies the initializer if 421/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 422/// declarators on it. 423Sema::DeclTy * 424Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 425 ExprTy *BW, ExprTy *InitExpr, 426 DeclTy *LastInGroup) { 427 const DeclSpec &DS = D.getDeclSpec(); 428 DeclarationName Name = GetNameForDeclarator(D); 429 Expr *BitWidth = static_cast<Expr*>(BW); 430 Expr *Init = static_cast<Expr*>(InitExpr); 431 SourceLocation Loc = D.getIdentifierLoc(); 432 433 bool isFunc = D.isFunctionDeclarator(); 434 435 // C++ 9.2p6: A member shall not be declared to have automatic storage 436 // duration (auto, register) or with the extern storage-class-specifier. 437 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 438 // data members and cannot be applied to names declared const or static, 439 // and cannot be applied to reference members. 440 switch (DS.getStorageClassSpec()) { 441 case DeclSpec::SCS_unspecified: 442 case DeclSpec::SCS_typedef: 443 case DeclSpec::SCS_static: 444 // FALL THROUGH. 445 break; 446 case DeclSpec::SCS_mutable: 447 if (isFunc) { 448 if (DS.getStorageClassSpecLoc().isValid()) 449 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 450 else 451 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 452 453 // FIXME: It would be nicer if the keyword was ignored only for this 454 // declarator. Otherwise we could get follow-up errors. 455 D.getMutableDeclSpec().ClearStorageClassSpecs(); 456 } else { 457 QualType T = GetTypeForDeclarator(D, S); 458 diag::kind err = static_cast<diag::kind>(0); 459 if (T->isReferenceType()) 460 err = diag::err_mutable_reference; 461 else if (T.isConstQualified()) 462 err = diag::err_mutable_const; 463 if (err != 0) { 464 if (DS.getStorageClassSpecLoc().isValid()) 465 Diag(DS.getStorageClassSpecLoc(), err); 466 else 467 Diag(DS.getThreadSpecLoc(), err); 468 // FIXME: It would be nicer if the keyword was ignored only for this 469 // declarator. Otherwise we could get follow-up errors. 470 D.getMutableDeclSpec().ClearStorageClassSpecs(); 471 } 472 } 473 break; 474 default: 475 if (DS.getStorageClassSpecLoc().isValid()) 476 Diag(DS.getStorageClassSpecLoc(), 477 diag::err_storageclass_invalid_for_member); 478 else 479 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 480 D.getMutableDeclSpec().ClearStorageClassSpecs(); 481 } 482 483 if (!isFunc && 484 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typedef && 485 D.getNumTypeObjects() == 0) { 486 // Check also for this case: 487 // 488 // typedef int f(); 489 // f a; 490 // 491 Decl *TD = static_cast<Decl *>(DS.getTypeRep()); 492 isFunc = Context.getTypeDeclType(cast<TypeDecl>(TD))->isFunctionType(); 493 } 494 495 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 496 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 497 !isFunc); 498 499 Decl *Member; 500 bool InvalidDecl = false; 501 502 if (isInstField) 503 Member = static_cast<Decl*>(ActOnField(S, cast<CXXRecordDecl>(CurContext), 504 Loc, D, BitWidth)); 505 else 506 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 507 508 if (!Member) return LastInGroup; 509 510 assert((Name || isInstField) && "No identifier for non-field ?"); 511 512 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 513 // specific methods. Use a wrapper class that can be used with all C++ class 514 // member decls. 515 CXXClassMemberWrapper(Member).setAccess(AS); 516 517 // C++ [dcl.init.aggr]p1: 518 // An aggregate is an array or a class (clause 9) with [...] no 519 // private or protected non-static data members (clause 11). 520 // A POD must be an aggregate. 521 if (isInstField && (AS == AS_private || AS == AS_protected)) { 522 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 523 Record->setAggregate(false); 524 Record->setPOD(false); 525 } 526 527 if (DS.isVirtualSpecified()) { 528 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 529 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 530 InvalidDecl = true; 531 } else { 532 cast<CXXMethodDecl>(Member)->setVirtual(); 533 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 534 CurClass->setAggregate(false); 535 CurClass->setPOD(false); 536 CurClass->setPolymorphic(true); 537 } 538 } 539 540 // FIXME: The above definition of virtual is not sufficient. A function is 541 // also virtual if it overrides an already virtual function. This is important 542 // to do here because it decides the validity of a pure specifier. 543 544 if (BitWidth) { 545 // C++ 9.6p2: Only when declaring an unnamed bit-field may the 546 // constant-expression be a value equal to zero. 547 // FIXME: Check this. 548 549 if (D.isFunctionDeclarator()) { 550 // FIXME: Emit diagnostic about only constructors taking base initializers 551 // or something similar, when constructor support is in place. 552 Diag(Loc, diag::err_not_bitfield_type) 553 << Name << BitWidth->getSourceRange(); 554 InvalidDecl = true; 555 556 } else if (isInstField) { 557 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 558 if (!cast<FieldDecl>(Member)->getType()->isIntegralType()) { 559 Diag(Loc, diag::err_not_integral_type_bitfield) 560 << Name << BitWidth->getSourceRange(); 561 InvalidDecl = true; 562 } 563 564 } else if (isa<FunctionDecl>(Member)) { 565 // A function typedef ("typedef int f(); f a;"). 566 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 567 Diag(Loc, diag::err_not_integral_type_bitfield) 568 << Name << BitWidth->getSourceRange(); 569 InvalidDecl = true; 570 571 } else if (isa<TypedefDecl>(Member)) { 572 // "cannot declare 'A' to be a bit-field type" 573 Diag(Loc, diag::err_not_bitfield_type) 574 << Name << BitWidth->getSourceRange(); 575 InvalidDecl = true; 576 577 } else { 578 assert(isa<CXXClassVarDecl>(Member) && 579 "Didn't we cover all member kinds?"); 580 // C++ 9.6p3: A bit-field shall not be a static member. 581 // "static member 'A' cannot be a bit-field" 582 Diag(Loc, diag::err_static_not_bitfield) 583 << Name << BitWidth->getSourceRange(); 584 InvalidDecl = true; 585 } 586 } 587 588 if (Init) { 589 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 590 // if it declares a static member of const integral or const enumeration 591 // type. 592 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 593 // ...static member of... 594 CVD->setInit(Init); 595 // ...const integral or const enumeration type. 596 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 597 CVD->getType()->isIntegralType()) { 598 // constant-initializer 599 if (CheckForConstantInitializer(Init, CVD->getType())) 600 InvalidDecl = true; 601 602 } else { 603 // not const integral. 604 Diag(Loc, diag::err_member_initialization) 605 << Name << Init->getSourceRange(); 606 InvalidDecl = true; 607 } 608 609 } else { 610 // not static member. perhaps virtual function? 611 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member)) { 612 // With declarators parsed the way they are, the parser cannot 613 // distinguish between a normal initializer and a pure-specifier. 614 // Thus this grotesque test. 615 IntegerLiteral *IL; 616 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 617 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 618 if (MD->isVirtual()) 619 MD->setPure(); 620 else { 621 Diag(Loc, diag::err_non_virtual_pure) 622 << Name << Init->getSourceRange(); 623 InvalidDecl = true; 624 } 625 } else { 626 Diag(Loc, diag::err_member_function_initialization) 627 << Name << Init->getSourceRange(); 628 InvalidDecl = true; 629 } 630 } else { 631 Diag(Loc, diag::err_member_initialization) 632 << Name << Init->getSourceRange(); 633 InvalidDecl = true; 634 } 635 } 636 } 637 638 if (InvalidDecl) 639 Member->setInvalidDecl(); 640 641 if (isInstField) { 642 FieldCollector->Add(cast<FieldDecl>(Member)); 643 return LastInGroup; 644 } 645 return Member; 646} 647 648/// ActOnMemInitializer - Handle a C++ member initializer. 649Sema::MemInitResult 650Sema::ActOnMemInitializer(DeclTy *ConstructorD, 651 Scope *S, 652 IdentifierInfo *MemberOrBase, 653 SourceLocation IdLoc, 654 SourceLocation LParenLoc, 655 ExprTy **Args, unsigned NumArgs, 656 SourceLocation *CommaLocs, 657 SourceLocation RParenLoc) { 658 CXXConstructorDecl *Constructor 659 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 660 if (!Constructor) { 661 // The user wrote a constructor initializer on a function that is 662 // not a C++ constructor. Ignore the error for now, because we may 663 // have more member initializers coming; we'll diagnose it just 664 // once in ActOnMemInitializers. 665 return true; 666 } 667 668 CXXRecordDecl *ClassDecl = Constructor->getParent(); 669 670 // C++ [class.base.init]p2: 671 // Names in a mem-initializer-id are looked up in the scope of the 672 // constructor’s class and, if not found in that scope, are looked 673 // up in the scope containing the constructor’s 674 // definition. [Note: if the constructor’s class contains a member 675 // with the same name as a direct or virtual base class of the 676 // class, a mem-initializer-id naming the member or base class and 677 // composed of a single identifier refers to the class member. A 678 // mem-initializer-id for the hidden base class may be specified 679 // using a qualified name. ] 680 // Look for a member, first. 681 FieldDecl *Member = 0; 682 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 683 if (Result.first != Result.second) 684 Member = dyn_cast<FieldDecl>(*Result.first); 685 686 // FIXME: Handle members of an anonymous union. 687 688 if (Member) { 689 // FIXME: Perform direct initialization of the member. 690 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 691 } 692 693 // It didn't name a member, so see if it names a class. 694 TypeTy *BaseTy = getTypeName(*MemberOrBase, IdLoc, S, 0/*SS*/); 695 if (!BaseTy) 696 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 697 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 698 699 QualType BaseType = Context.getTypeDeclType((TypeDecl *)BaseTy); 700 if (!BaseType->isRecordType()) 701 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 702 << BaseType << SourceRange(IdLoc, RParenLoc); 703 704 // C++ [class.base.init]p2: 705 // [...] Unless the mem-initializer-id names a nonstatic data 706 // member of the constructor’s class or a direct or virtual base 707 // of that class, the mem-initializer is ill-formed. A 708 // mem-initializer-list can initialize a base class using any 709 // name that denotes that base class type. 710 711 // First, check for a direct base class. 712 const CXXBaseSpecifier *DirectBaseSpec = 0; 713 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 714 Base != ClassDecl->bases_end(); ++Base) { 715 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 716 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 717 // We found a direct base of this type. That's what we're 718 // initializing. 719 DirectBaseSpec = &*Base; 720 break; 721 } 722 } 723 724 // Check for a virtual base class. 725 // FIXME: We might be able to short-circuit this if we know in 726 // advance that there are no virtual bases. 727 const CXXBaseSpecifier *VirtualBaseSpec = 0; 728 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 729 // We haven't found a base yet; search the class hierarchy for a 730 // virtual base class. 731 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 734 for (BasePaths::paths_iterator Path = Paths.begin(); 735 Path != Paths.end(); ++Path) { 736 if (Path->back().Base->isVirtual()) { 737 VirtualBaseSpec = Path->back().Base; 738 break; 739 } 740 } 741 } 742 } 743 744 // C++ [base.class.init]p2: 745 // If a mem-initializer-id is ambiguous because it designates both 746 // a direct non-virtual base class and an inherited virtual base 747 // class, the mem-initializer is ill-formed. 748 if (DirectBaseSpec && VirtualBaseSpec) 749 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 750 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 751 752 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 753} 754 755 756void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 757 DeclTy *TagDecl, 758 SourceLocation LBrac, 759 SourceLocation RBrac) { 760 AdjustDeclIfTemplate(TagDecl); 761 ActOnFields(S, RLoc, TagDecl, 762 (DeclTy**)FieldCollector->getCurFields(), 763 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 764 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 765} 766 767/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 768/// special functions, such as the default constructor, copy 769/// constructor, or destructor, to the given C++ class (C++ 770/// [special]p1). This routine can only be executed just before the 771/// definition of the class is complete. 772void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 773 QualType ClassType = Context.getTypeDeclType(ClassDecl); 774 ClassType = Context.getCanonicalType(ClassType); 775 776 if (!ClassDecl->hasUserDeclaredConstructor()) { 777 // C++ [class.ctor]p5: 778 // A default constructor for a class X is a constructor of class X 779 // that can be called without an argument. If there is no 780 // user-declared constructor for class X, a default constructor is 781 // implicitly declared. An implicitly-declared default constructor 782 // is an inline public member of its class. 783 DeclarationName Name 784 = Context.DeclarationNames.getCXXConstructorName(ClassType); 785 CXXConstructorDecl *DefaultCon = 786 CXXConstructorDecl::Create(Context, ClassDecl, 787 ClassDecl->getLocation(), Name, 788 Context.getFunctionType(Context.VoidTy, 789 0, 0, false, 0), 790 /*isExplicit=*/false, 791 /*isInline=*/true, 792 /*isImplicitlyDeclared=*/true); 793 DefaultCon->setAccess(AS_public); 794 DefaultCon->setImplicit(); 795 ClassDecl->addDecl(DefaultCon); 796 797 // Notify the class that we've added a constructor. 798 ClassDecl->addedConstructor(Context, DefaultCon); 799 } 800 801 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 802 // C++ [class.copy]p4: 803 // If the class definition does not explicitly declare a copy 804 // constructor, one is declared implicitly. 805 806 // C++ [class.copy]p5: 807 // The implicitly-declared copy constructor for a class X will 808 // have the form 809 // 810 // X::X(const X&) 811 // 812 // if 813 bool HasConstCopyConstructor = true; 814 815 // -- each direct or virtual base class B of X has a copy 816 // constructor whose first parameter is of type const B& or 817 // const volatile B&, and 818 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 819 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 820 const CXXRecordDecl *BaseClassDecl 821 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 822 HasConstCopyConstructor 823 = BaseClassDecl->hasConstCopyConstructor(Context); 824 } 825 826 // -- for all the nonstatic data members of X that are of a 827 // class type M (or array thereof), each such class type 828 // has a copy constructor whose first parameter is of type 829 // const M& or const volatile M&. 830 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 831 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 832 QualType FieldType = (*Field)->getType(); 833 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 834 FieldType = Array->getElementType(); 835 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 836 const CXXRecordDecl *FieldClassDecl 837 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 838 HasConstCopyConstructor 839 = FieldClassDecl->hasConstCopyConstructor(Context); 840 } 841 } 842 843 // Otherwise, the implicitly declared copy constructor will have 844 // the form 845 // 846 // X::X(X&) 847 QualType ArgType = ClassType; 848 if (HasConstCopyConstructor) 849 ArgType = ArgType.withConst(); 850 ArgType = Context.getReferenceType(ArgType); 851 852 // An implicitly-declared copy constructor is an inline public 853 // member of its class. 854 DeclarationName Name 855 = Context.DeclarationNames.getCXXConstructorName(ClassType); 856 CXXConstructorDecl *CopyConstructor 857 = CXXConstructorDecl::Create(Context, ClassDecl, 858 ClassDecl->getLocation(), Name, 859 Context.getFunctionType(Context.VoidTy, 860 &ArgType, 1, 861 false, 0), 862 /*isExplicit=*/false, 863 /*isInline=*/true, 864 /*isImplicitlyDeclared=*/true); 865 CopyConstructor->setAccess(AS_public); 866 CopyConstructor->setImplicit(); 867 868 // Add the parameter to the constructor. 869 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 870 ClassDecl->getLocation(), 871 /*IdentifierInfo=*/0, 872 ArgType, VarDecl::None, 0); 873 CopyConstructor->setParams(Context, &FromParam, 1); 874 875 ClassDecl->addedConstructor(Context, CopyConstructor); 876 ClassDecl->addDecl(CopyConstructor); 877 } 878 879 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 880 // Note: The following rules are largely analoguous to the copy 881 // constructor rules. Note that virtual bases are not taken into account 882 // for determining the argument type of the operator. Note also that 883 // operators taking an object instead of a reference are allowed. 884 // 885 // C++ [class.copy]p10: 886 // If the class definition does not explicitly declare a copy 887 // assignment operator, one is declared implicitly. 888 // The implicitly-defined copy assignment operator for a class X 889 // will have the form 890 // 891 // X& X::operator=(const X&) 892 // 893 // if 894 bool HasConstCopyAssignment = true; 895 896 // -- each direct base class B of X has a copy assignment operator 897 // whose parameter is of type const B&, const volatile B& or B, 898 // and 899 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 900 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 901 const CXXRecordDecl *BaseClassDecl 902 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 903 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 904 } 905 906 // -- for all the nonstatic data members of X that are of a class 907 // type M (or array thereof), each such class type has a copy 908 // assignment operator whose parameter is of type const M&, 909 // const volatile M& or M. 910 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 911 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 912 QualType FieldType = (*Field)->getType(); 913 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 914 FieldType = Array->getElementType(); 915 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 916 const CXXRecordDecl *FieldClassDecl 917 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 918 HasConstCopyAssignment 919 = FieldClassDecl->hasConstCopyAssignment(Context); 920 } 921 } 922 923 // Otherwise, the implicitly declared copy assignment operator will 924 // have the form 925 // 926 // X& X::operator=(X&) 927 QualType ArgType = ClassType; 928 QualType RetType = Context.getReferenceType(ArgType); 929 if (HasConstCopyAssignment) 930 ArgType = ArgType.withConst(); 931 ArgType = Context.getReferenceType(ArgType); 932 933 // An implicitly-declared copy assignment operator is an inline public 934 // member of its class. 935 DeclarationName Name = 936 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 937 CXXMethodDecl *CopyAssignment = 938 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 939 Context.getFunctionType(RetType, &ArgType, 1, 940 false, 0), 941 /*isStatic=*/false, /*isInline=*/true); 942 CopyAssignment->setAccess(AS_public); 943 CopyAssignment->setImplicit(); 944 945 // Add the parameter to the operator. 946 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 947 ClassDecl->getLocation(), 948 /*IdentifierInfo=*/0, 949 ArgType, VarDecl::None, 0); 950 CopyAssignment->setParams(Context, &FromParam, 1); 951 952 // Don't call addedAssignmentOperator. There is no way to distinguish an 953 // implicit from an explicit assignment operator. 954 ClassDecl->addDecl(CopyAssignment); 955 } 956 957 if (!ClassDecl->hasUserDeclaredDestructor()) { 958 // C++ [class.dtor]p2: 959 // If a class has no user-declared destructor, a destructor is 960 // declared implicitly. An implicitly-declared destructor is an 961 // inline public member of its class. 962 DeclarationName Name 963 = Context.DeclarationNames.getCXXDestructorName(ClassType); 964 CXXDestructorDecl *Destructor 965 = CXXDestructorDecl::Create(Context, ClassDecl, 966 ClassDecl->getLocation(), Name, 967 Context.getFunctionType(Context.VoidTy, 968 0, 0, false, 0), 969 /*isInline=*/true, 970 /*isImplicitlyDeclared=*/true); 971 Destructor->setAccess(AS_public); 972 Destructor->setImplicit(); 973 ClassDecl->addDecl(Destructor); 974 } 975} 976 977/// ActOnStartDelayedCXXMethodDeclaration - We have completed 978/// parsing a top-level (non-nested) C++ class, and we are now 979/// parsing those parts of the given Method declaration that could 980/// not be parsed earlier (C++ [class.mem]p2), such as default 981/// arguments. This action should enter the scope of the given 982/// Method declaration as if we had just parsed the qualified method 983/// name. However, it should not bring the parameters into scope; 984/// that will be performed by ActOnDelayedCXXMethodParameter. 985void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 986 CXXScopeSpec SS; 987 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 988 ActOnCXXEnterDeclaratorScope(S, SS); 989} 990 991/// ActOnDelayedCXXMethodParameter - We've already started a delayed 992/// C++ method declaration. We're (re-)introducing the given 993/// function parameter into scope for use in parsing later parts of 994/// the method declaration. For example, we could see an 995/// ActOnParamDefaultArgument event for this parameter. 996void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 997 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 998 999 // If this parameter has an unparsed default argument, clear it out 1000 // to make way for the parsed default argument. 1001 if (Param->hasUnparsedDefaultArg()) 1002 Param->setDefaultArg(0); 1003 1004 S->AddDecl(Param); 1005 if (Param->getDeclName()) 1006 IdResolver.AddDecl(Param); 1007} 1008 1009/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1010/// processing the delayed method declaration for Method. The method 1011/// declaration is now considered finished. There may be a separate 1012/// ActOnStartOfFunctionDef action later (not necessarily 1013/// immediately!) for this method, if it was also defined inside the 1014/// class body. 1015void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1016 FunctionDecl *Method = (FunctionDecl*)MethodD; 1017 CXXScopeSpec SS; 1018 SS.setScopeRep(Method->getDeclContext()); 1019 ActOnCXXExitDeclaratorScope(S, SS); 1020 1021 // Now that we have our default arguments, check the constructor 1022 // again. It could produce additional diagnostics or affect whether 1023 // the class has implicitly-declared destructors, among other 1024 // things. 1025 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1026 if (CheckConstructor(Constructor)) 1027 Constructor->setInvalidDecl(); 1028 } 1029 1030 // Check the default arguments, which we may have added. 1031 if (!Method->isInvalidDecl()) 1032 CheckCXXDefaultArguments(Method); 1033} 1034 1035/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1036/// the well-formedness of the constructor declarator @p D with type @p 1037/// R. If there are any errors in the declarator, this routine will 1038/// emit diagnostics and return true. Otherwise, it will return 1039/// false. Either way, the type @p R will be updated to reflect a 1040/// well-formed type for the constructor. 1041bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1042 FunctionDecl::StorageClass& SC) { 1043 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1044 bool isInvalid = false; 1045 1046 // C++ [class.ctor]p3: 1047 // A constructor shall not be virtual (10.3) or static (9.4). A 1048 // constructor can be invoked for a const, volatile or const 1049 // volatile object. A constructor shall not be declared const, 1050 // volatile, or const volatile (9.3.2). 1051 if (isVirtual) { 1052 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1053 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1054 << SourceRange(D.getIdentifierLoc()); 1055 isInvalid = true; 1056 } 1057 if (SC == FunctionDecl::Static) { 1058 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1059 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1060 << SourceRange(D.getIdentifierLoc()); 1061 isInvalid = true; 1062 SC = FunctionDecl::None; 1063 } 1064 if (D.getDeclSpec().hasTypeSpecifier()) { 1065 // Constructors don't have return types, but the parser will 1066 // happily parse something like: 1067 // 1068 // class X { 1069 // float X(float); 1070 // }; 1071 // 1072 // The return type will be eliminated later. 1073 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1074 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1075 << SourceRange(D.getIdentifierLoc()); 1076 } 1077 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1078 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1079 if (FTI.TypeQuals & QualType::Const) 1080 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1081 << "const" << SourceRange(D.getIdentifierLoc()); 1082 if (FTI.TypeQuals & QualType::Volatile) 1083 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1084 << "volatile" << SourceRange(D.getIdentifierLoc()); 1085 if (FTI.TypeQuals & QualType::Restrict) 1086 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1087 << "restrict" << SourceRange(D.getIdentifierLoc()); 1088 } 1089 1090 // Rebuild the function type "R" without any type qualifiers (in 1091 // case any of the errors above fired) and with "void" as the 1092 // return type, since constructors don't have return types. We 1093 // *always* have to do this, because GetTypeForDeclarator will 1094 // put in a result type of "int" when none was specified. 1095 const FunctionTypeProto *Proto = R->getAsFunctionTypeProto(); 1096 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1097 Proto->getNumArgs(), 1098 Proto->isVariadic(), 1099 0); 1100 1101 return isInvalid; 1102} 1103 1104/// CheckConstructor - Checks a fully-formed constructor for 1105/// well-formedness, issuing any diagnostics required. Returns true if 1106/// the constructor declarator is invalid. 1107bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1108 if (Constructor->isInvalidDecl()) 1109 return true; 1110 1111 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1112 bool Invalid = false; 1113 1114 // C++ [class.copy]p3: 1115 // A declaration of a constructor for a class X is ill-formed if 1116 // its first parameter is of type (optionally cv-qualified) X and 1117 // either there are no other parameters or else all other 1118 // parameters have default arguments. 1119 if ((Constructor->getNumParams() == 1) || 1120 (Constructor->getNumParams() > 1 && 1121 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1122 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1123 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1124 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1125 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1126 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1127 Invalid = true; 1128 } 1129 } 1130 1131 // Notify the class that we've added a constructor. 1132 ClassDecl->addedConstructor(Context, Constructor); 1133 1134 return Invalid; 1135} 1136 1137/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1138/// the well-formednes of the destructor declarator @p D with type @p 1139/// R. If there are any errors in the declarator, this routine will 1140/// emit diagnostics and return true. Otherwise, it will return 1141/// false. Either way, the type @p R will be updated to reflect a 1142/// well-formed type for the destructor. 1143bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1144 FunctionDecl::StorageClass& SC) { 1145 bool isInvalid = false; 1146 1147 // C++ [class.dtor]p1: 1148 // [...] A typedef-name that names a class is a class-name 1149 // (7.1.3); however, a typedef-name that names a class shall not 1150 // be used as the identifier in the declarator for a destructor 1151 // declaration. 1152 TypeDecl *DeclaratorTypeD = (TypeDecl *)D.getDeclaratorIdType(); 1153 if (const TypedefDecl *TypedefD = dyn_cast<TypedefDecl>(DeclaratorTypeD)) { 1154 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1155 << TypedefD->getDeclName(); 1156 isInvalid = true; 1157 } 1158 1159 // C++ [class.dtor]p2: 1160 // A destructor is used to destroy objects of its class type. A 1161 // destructor takes no parameters, and no return type can be 1162 // specified for it (not even void). The address of a destructor 1163 // shall not be taken. A destructor shall not be static. A 1164 // destructor can be invoked for a const, volatile or const 1165 // volatile object. A destructor shall not be declared const, 1166 // volatile or const volatile (9.3.2). 1167 if (SC == FunctionDecl::Static) { 1168 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1169 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1170 << SourceRange(D.getIdentifierLoc()); 1171 isInvalid = true; 1172 SC = FunctionDecl::None; 1173 } 1174 if (D.getDeclSpec().hasTypeSpecifier()) { 1175 // Destructors don't have return types, but the parser will 1176 // happily parse something like: 1177 // 1178 // class X { 1179 // float ~X(); 1180 // }; 1181 // 1182 // The return type will be eliminated later. 1183 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1184 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1185 << SourceRange(D.getIdentifierLoc()); 1186 } 1187 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1188 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1189 if (FTI.TypeQuals & QualType::Const) 1190 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1191 << "const" << SourceRange(D.getIdentifierLoc()); 1192 if (FTI.TypeQuals & QualType::Volatile) 1193 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1194 << "volatile" << SourceRange(D.getIdentifierLoc()); 1195 if (FTI.TypeQuals & QualType::Restrict) 1196 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1197 << "restrict" << SourceRange(D.getIdentifierLoc()); 1198 } 1199 1200 // Make sure we don't have any parameters. 1201 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1202 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1203 1204 // Delete the parameters. 1205 D.getTypeObject(0).Fun.freeArgs(); 1206 } 1207 1208 // Make sure the destructor isn't variadic. 1209 if (R->getAsFunctionTypeProto()->isVariadic()) 1210 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1211 1212 // Rebuild the function type "R" without any type qualifiers or 1213 // parameters (in case any of the errors above fired) and with 1214 // "void" as the return type, since destructors don't have return 1215 // types. We *always* have to do this, because GetTypeForDeclarator 1216 // will put in a result type of "int" when none was specified. 1217 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1218 1219 return isInvalid; 1220} 1221 1222/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1223/// well-formednes of the conversion function declarator @p D with 1224/// type @p R. If there are any errors in the declarator, this routine 1225/// will emit diagnostics and return true. Otherwise, it will return 1226/// false. Either way, the type @p R will be updated to reflect a 1227/// well-formed type for the conversion operator. 1228bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1229 FunctionDecl::StorageClass& SC) { 1230 bool isInvalid = false; 1231 1232 // C++ [class.conv.fct]p1: 1233 // Neither parameter types nor return type can be specified. The 1234 // type of a conversion function (8.3.5) is “function taking no 1235 // parameter returning conversion-type-id.” 1236 if (SC == FunctionDecl::Static) { 1237 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1238 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1239 << SourceRange(D.getIdentifierLoc()); 1240 isInvalid = true; 1241 SC = FunctionDecl::None; 1242 } 1243 if (D.getDeclSpec().hasTypeSpecifier()) { 1244 // Conversion functions don't have return types, but the parser will 1245 // happily parse something like: 1246 // 1247 // class X { 1248 // float operator bool(); 1249 // }; 1250 // 1251 // The return type will be changed later anyway. 1252 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1253 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1254 << SourceRange(D.getIdentifierLoc()); 1255 } 1256 1257 // Make sure we don't have any parameters. 1258 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1259 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1260 1261 // Delete the parameters. 1262 D.getTypeObject(0).Fun.freeArgs(); 1263 } 1264 1265 // Make sure the conversion function isn't variadic. 1266 if (R->getAsFunctionTypeProto()->isVariadic()) 1267 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1268 1269 // C++ [class.conv.fct]p4: 1270 // The conversion-type-id shall not represent a function type nor 1271 // an array type. 1272 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1273 if (ConvType->isArrayType()) { 1274 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1275 ConvType = Context.getPointerType(ConvType); 1276 } else if (ConvType->isFunctionType()) { 1277 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1278 ConvType = Context.getPointerType(ConvType); 1279 } 1280 1281 // Rebuild the function type "R" without any parameters (in case any 1282 // of the errors above fired) and with the conversion type as the 1283 // return type. 1284 R = Context.getFunctionType(ConvType, 0, 0, false, 1285 R->getAsFunctionTypeProto()->getTypeQuals()); 1286 1287 // C++0x explicit conversion operators. 1288 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1289 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1290 diag::warn_explicit_conversion_functions) 1291 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1292 1293 return isInvalid; 1294} 1295 1296/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1297/// the declaration of the given C++ conversion function. This routine 1298/// is responsible for recording the conversion function in the C++ 1299/// class, if possible. 1300Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1301 assert(Conversion && "Expected to receive a conversion function declaration"); 1302 1303 // Set the lexical context of this conversion function 1304 Conversion->setLexicalDeclContext(CurContext); 1305 1306 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1307 1308 // Make sure we aren't redeclaring the conversion function. 1309 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1310 1311 // C++ [class.conv.fct]p1: 1312 // [...] A conversion function is never used to convert a 1313 // (possibly cv-qualified) object to the (possibly cv-qualified) 1314 // same object type (or a reference to it), to a (possibly 1315 // cv-qualified) base class of that type (or a reference to it), 1316 // or to (possibly cv-qualified) void. 1317 // FIXME: Suppress this warning if the conversion function ends up 1318 // being a virtual function that overrides a virtual function in a 1319 // base class. 1320 QualType ClassType 1321 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1322 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1323 ConvType = ConvTypeRef->getPointeeType(); 1324 if (ConvType->isRecordType()) { 1325 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1326 if (ConvType == ClassType) 1327 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1328 << ClassType; 1329 else if (IsDerivedFrom(ClassType, ConvType)) 1330 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1331 << ClassType << ConvType; 1332 } else if (ConvType->isVoidType()) { 1333 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1334 << ClassType << ConvType; 1335 } 1336 1337 if (Conversion->getPreviousDeclaration()) { 1338 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1339 for (OverloadedFunctionDecl::function_iterator 1340 Conv = Conversions->function_begin(), 1341 ConvEnd = Conversions->function_end(); 1342 Conv != ConvEnd; ++Conv) { 1343 if (*Conv == Conversion->getPreviousDeclaration()) { 1344 *Conv = Conversion; 1345 return (DeclTy *)Conversion; 1346 } 1347 } 1348 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1349 } else 1350 ClassDecl->addConversionFunction(Context, Conversion); 1351 1352 return (DeclTy *)Conversion; 1353} 1354 1355//===----------------------------------------------------------------------===// 1356// Namespace Handling 1357//===----------------------------------------------------------------------===// 1358 1359/// ActOnStartNamespaceDef - This is called at the start of a namespace 1360/// definition. 1361Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1362 SourceLocation IdentLoc, 1363 IdentifierInfo *II, 1364 SourceLocation LBrace) { 1365 NamespaceDecl *Namespc = 1366 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1367 Namespc->setLBracLoc(LBrace); 1368 1369 Scope *DeclRegionScope = NamespcScope->getParent(); 1370 1371 if (II) { 1372 // C++ [namespace.def]p2: 1373 // The identifier in an original-namespace-definition shall not have been 1374 // previously defined in the declarative region in which the 1375 // original-namespace-definition appears. The identifier in an 1376 // original-namespace-definition is the name of the namespace. Subsequently 1377 // in that declarative region, it is treated as an original-namespace-name. 1378 1379 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1380 true); 1381 1382 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1383 // This is an extended namespace definition. 1384 // Attach this namespace decl to the chain of extended namespace 1385 // definitions. 1386 OrigNS->setNextNamespace(Namespc); 1387 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1388 1389 // Remove the previous declaration from the scope. 1390 if (DeclRegionScope->isDeclScope(OrigNS)) { 1391 IdResolver.RemoveDecl(OrigNS); 1392 DeclRegionScope->RemoveDecl(OrigNS); 1393 } 1394 } else if (PrevDecl) { 1395 // This is an invalid name redefinition. 1396 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1397 << Namespc->getDeclName(); 1398 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1399 Namespc->setInvalidDecl(); 1400 // Continue on to push Namespc as current DeclContext and return it. 1401 } 1402 1403 PushOnScopeChains(Namespc, DeclRegionScope); 1404 } else { 1405 // FIXME: Handle anonymous namespaces 1406 } 1407 1408 // Although we could have an invalid decl (i.e. the namespace name is a 1409 // redefinition), push it as current DeclContext and try to continue parsing. 1410 // FIXME: We should be able to push Namespc here, so that the 1411 // each DeclContext for the namespace has the declarations 1412 // that showed up in that particular namespace definition. 1413 PushDeclContext(NamespcScope, Namespc); 1414 return Namespc; 1415} 1416 1417/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1418/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1419void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1420 Decl *Dcl = static_cast<Decl *>(D); 1421 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1422 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1423 Namespc->setRBracLoc(RBrace); 1424 PopDeclContext(); 1425} 1426 1427Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1428 SourceLocation UsingLoc, 1429 SourceLocation NamespcLoc, 1430 const CXXScopeSpec &SS, 1431 SourceLocation IdentLoc, 1432 IdentifierInfo *NamespcName, 1433 AttributeList *AttrList) { 1434 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1435 assert(NamespcName && "Invalid NamespcName."); 1436 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1437 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1438 1439 UsingDirectiveDecl *UDir = 0; 1440 1441 // Lookup namespace name. 1442 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1443 LookupNamespaceName, false); 1444 if (R.isAmbiguous()) { 1445 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1446 return 0; 1447 } 1448 if (NamedDecl *NS = R) { 1449 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1450 // C++ [namespace.udir]p1: 1451 // A using-directive specifies that the names in the nominated 1452 // namespace can be used in the scope in which the 1453 // using-directive appears after the using-directive. During 1454 // unqualified name lookup (3.4.1), the names appear as if they 1455 // were declared in the nearest enclosing namespace which 1456 // contains both the using-directive and the nominated 1457 // namespace. [Note: in this context, “contains” means “contains 1458 // directly or indirectly”. ] 1459 1460 // Find enclosing context containing both using-directive and 1461 // nominated namespace. 1462 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1463 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1464 CommonAncestor = CommonAncestor->getParent(); 1465 1466 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1467 NamespcLoc, IdentLoc, 1468 cast<NamespaceDecl>(NS), 1469 CommonAncestor); 1470 PushUsingDirective(S, UDir); 1471 } else { 1472 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1473 } 1474 1475 // FIXME: We ignore attributes for now. 1476 delete AttrList; 1477 return UDir; 1478} 1479 1480void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1481 // If scope has associated entity, then using directive is at namespace 1482 // or translation unit scope. We add UsingDirectiveDecls, into 1483 // it's lookup structure. 1484 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1485 Ctx->addDecl(UDir); 1486 else 1487 // Otherwise it is block-sope. using-directives will affect lookup 1488 // only to the end of scope. 1489 S->PushUsingDirective(UDir); 1490} 1491 1492/// AddCXXDirectInitializerToDecl - This action is called immediately after 1493/// ActOnDeclarator, when a C++ direct initializer is present. 1494/// e.g: "int x(1);" 1495void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1496 ExprTy **ExprTys, unsigned NumExprs, 1497 SourceLocation *CommaLocs, 1498 SourceLocation RParenLoc) { 1499 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1500 Decl *RealDecl = static_cast<Decl *>(Dcl); 1501 1502 // If there is no declaration, there was an error parsing it. Just ignore 1503 // the initializer. 1504 if (RealDecl == 0) { 1505 for (unsigned i = 0; i != NumExprs; ++i) 1506 delete static_cast<Expr *>(ExprTys[i]); 1507 return; 1508 } 1509 1510 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1511 if (!VDecl) { 1512 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1513 RealDecl->setInvalidDecl(); 1514 return; 1515 } 1516 1517 // We will treat direct-initialization as a copy-initialization: 1518 // int x(1); -as-> int x = 1; 1519 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1520 // 1521 // Clients that want to distinguish between the two forms, can check for 1522 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1523 // A major benefit is that clients that don't particularly care about which 1524 // exactly form was it (like the CodeGen) can handle both cases without 1525 // special case code. 1526 1527 // C++ 8.5p11: 1528 // The form of initialization (using parentheses or '=') is generally 1529 // insignificant, but does matter when the entity being initialized has a 1530 // class type. 1531 QualType DeclInitType = VDecl->getType(); 1532 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1533 DeclInitType = Array->getElementType(); 1534 1535 if (VDecl->getType()->isRecordType()) { 1536 CXXConstructorDecl *Constructor 1537 = PerformInitializationByConstructor(DeclInitType, 1538 (Expr **)ExprTys, NumExprs, 1539 VDecl->getLocation(), 1540 SourceRange(VDecl->getLocation(), 1541 RParenLoc), 1542 VDecl->getDeclName(), 1543 IK_Direct); 1544 if (!Constructor) { 1545 RealDecl->setInvalidDecl(); 1546 } 1547 1548 // Let clients know that initialization was done with a direct 1549 // initializer. 1550 VDecl->setCXXDirectInitializer(true); 1551 1552 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1553 // the initializer. 1554 return; 1555 } 1556 1557 if (NumExprs > 1) { 1558 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1559 << SourceRange(VDecl->getLocation(), RParenLoc); 1560 RealDecl->setInvalidDecl(); 1561 return; 1562 } 1563 1564 // Let clients know that initialization was done with a direct initializer. 1565 VDecl->setCXXDirectInitializer(true); 1566 1567 assert(NumExprs == 1 && "Expected 1 expression"); 1568 // Set the init expression, handles conversions. 1569 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1570} 1571 1572/// PerformInitializationByConstructor - Perform initialization by 1573/// constructor (C++ [dcl.init]p14), which may occur as part of 1574/// direct-initialization or copy-initialization. We are initializing 1575/// an object of type @p ClassType with the given arguments @p 1576/// Args. @p Loc is the location in the source code where the 1577/// initializer occurs (e.g., a declaration, member initializer, 1578/// functional cast, etc.) while @p Range covers the whole 1579/// initialization. @p InitEntity is the entity being initialized, 1580/// which may by the name of a declaration or a type. @p Kind is the 1581/// kind of initialization we're performing, which affects whether 1582/// explicit constructors will be considered. When successful, returns 1583/// the constructor that will be used to perform the initialization; 1584/// when the initialization fails, emits a diagnostic and returns 1585/// null. 1586CXXConstructorDecl * 1587Sema::PerformInitializationByConstructor(QualType ClassType, 1588 Expr **Args, unsigned NumArgs, 1589 SourceLocation Loc, SourceRange Range, 1590 DeclarationName InitEntity, 1591 InitializationKind Kind) { 1592 const RecordType *ClassRec = ClassType->getAsRecordType(); 1593 assert(ClassRec && "Can only initialize a class type here"); 1594 1595 // C++ [dcl.init]p14: 1596 // 1597 // If the initialization is direct-initialization, or if it is 1598 // copy-initialization where the cv-unqualified version of the 1599 // source type is the same class as, or a derived class of, the 1600 // class of the destination, constructors are considered. The 1601 // applicable constructors are enumerated (13.3.1.3), and the 1602 // best one is chosen through overload resolution (13.3). The 1603 // constructor so selected is called to initialize the object, 1604 // with the initializer expression(s) as its argument(s). If no 1605 // constructor applies, or the overload resolution is ambiguous, 1606 // the initialization is ill-formed. 1607 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1608 OverloadCandidateSet CandidateSet; 1609 1610 // Add constructors to the overload set. 1611 DeclarationName ConstructorName 1612 = Context.DeclarationNames.getCXXConstructorName( 1613 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1614 DeclContext::lookup_const_iterator Con, ConEnd; 1615 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1616 Con != ConEnd; ++Con) { 1617 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1618 if ((Kind == IK_Direct) || 1619 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1620 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1621 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1622 } 1623 1624 // FIXME: When we decide not to synthesize the implicitly-declared 1625 // constructors, we'll need to make them appear here. 1626 1627 OverloadCandidateSet::iterator Best; 1628 switch (BestViableFunction(CandidateSet, Best)) { 1629 case OR_Success: 1630 // We found a constructor. Return it. 1631 return cast<CXXConstructorDecl>(Best->Function); 1632 1633 case OR_No_Viable_Function: 1634 if (InitEntity) 1635 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1636 << InitEntity << (unsigned)CandidateSet.size() << Range; 1637 else 1638 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1639 << ClassType << (unsigned)CandidateSet.size() << Range; 1640 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1641 return 0; 1642 1643 case OR_Ambiguous: 1644 if (InitEntity) 1645 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1646 else 1647 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1648 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1649 return 0; 1650 } 1651 1652 return 0; 1653} 1654 1655/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1656/// determine whether they are reference-related, 1657/// reference-compatible, reference-compatible with added 1658/// qualification, or incompatible, for use in C++ initialization by 1659/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1660/// type, and the first type (T1) is the pointee type of the reference 1661/// type being initialized. 1662Sema::ReferenceCompareResult 1663Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1664 bool& DerivedToBase) { 1665 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1666 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1667 1668 T1 = Context.getCanonicalType(T1); 1669 T2 = Context.getCanonicalType(T2); 1670 QualType UnqualT1 = T1.getUnqualifiedType(); 1671 QualType UnqualT2 = T2.getUnqualifiedType(); 1672 1673 // C++ [dcl.init.ref]p4: 1674 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1675 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1676 // T1 is a base class of T2. 1677 if (UnqualT1 == UnqualT2) 1678 DerivedToBase = false; 1679 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1680 DerivedToBase = true; 1681 else 1682 return Ref_Incompatible; 1683 1684 // At this point, we know that T1 and T2 are reference-related (at 1685 // least). 1686 1687 // C++ [dcl.init.ref]p4: 1688 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1689 // reference-related to T2 and cv1 is the same cv-qualification 1690 // as, or greater cv-qualification than, cv2. For purposes of 1691 // overload resolution, cases for which cv1 is greater 1692 // cv-qualification than cv2 are identified as 1693 // reference-compatible with added qualification (see 13.3.3.2). 1694 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1695 return Ref_Compatible; 1696 else if (T1.isMoreQualifiedThan(T2)) 1697 return Ref_Compatible_With_Added_Qualification; 1698 else 1699 return Ref_Related; 1700} 1701 1702/// CheckReferenceInit - Check the initialization of a reference 1703/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1704/// the initializer (either a simple initializer or an initializer 1705/// list), and DeclType is the type of the declaration. When ICS is 1706/// non-null, this routine will compute the implicit conversion 1707/// sequence according to C++ [over.ics.ref] and will not produce any 1708/// diagnostics; when ICS is null, it will emit diagnostics when any 1709/// errors are found. Either way, a return value of true indicates 1710/// that there was a failure, a return value of false indicates that 1711/// the reference initialization succeeded. 1712/// 1713/// When @p SuppressUserConversions, user-defined conversions are 1714/// suppressed. 1715/// When @p AllowExplicit, we also permit explicit user-defined 1716/// conversion functions. 1717bool 1718Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1719 ImplicitConversionSequence *ICS, 1720 bool SuppressUserConversions, 1721 bool AllowExplicit) { 1722 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1723 1724 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1725 QualType T2 = Init->getType(); 1726 1727 // If the initializer is the address of an overloaded function, try 1728 // to resolve the overloaded function. If all goes well, T2 is the 1729 // type of the resulting function. 1730 if (T2->isOverloadType()) { 1731 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1732 ICS != 0); 1733 if (Fn) { 1734 // Since we're performing this reference-initialization for 1735 // real, update the initializer with the resulting function. 1736 if (!ICS) 1737 FixOverloadedFunctionReference(Init, Fn); 1738 1739 T2 = Fn->getType(); 1740 } 1741 } 1742 1743 // Compute some basic properties of the types and the initializer. 1744 bool DerivedToBase = false; 1745 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1746 ReferenceCompareResult RefRelationship 1747 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1748 1749 // Most paths end in a failed conversion. 1750 if (ICS) 1751 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1752 1753 // C++ [dcl.init.ref]p5: 1754 // A reference to type “cv1 T1” is initialized by an expression 1755 // of type “cv2 T2” as follows: 1756 1757 // -- If the initializer expression 1758 1759 bool BindsDirectly = false; 1760 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1761 // reference-compatible with “cv2 T2,” or 1762 // 1763 // Note that the bit-field check is skipped if we are just computing 1764 // the implicit conversion sequence (C++ [over.best.ics]p2). 1765 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1766 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1767 BindsDirectly = true; 1768 1769 if (ICS) { 1770 // C++ [over.ics.ref]p1: 1771 // When a parameter of reference type binds directly (8.5.3) 1772 // to an argument expression, the implicit conversion sequence 1773 // is the identity conversion, unless the argument expression 1774 // has a type that is a derived class of the parameter type, 1775 // in which case the implicit conversion sequence is a 1776 // derived-to-base Conversion (13.3.3.1). 1777 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1778 ICS->Standard.First = ICK_Identity; 1779 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1780 ICS->Standard.Third = ICK_Identity; 1781 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1782 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1783 ICS->Standard.ReferenceBinding = true; 1784 ICS->Standard.DirectBinding = true; 1785 1786 // Nothing more to do: the inaccessibility/ambiguity check for 1787 // derived-to-base conversions is suppressed when we're 1788 // computing the implicit conversion sequence (C++ 1789 // [over.best.ics]p2). 1790 return false; 1791 } else { 1792 // Perform the conversion. 1793 // FIXME: Binding to a subobject of the lvalue is going to require 1794 // more AST annotation than this. 1795 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1796 } 1797 } 1798 1799 // -- has a class type (i.e., T2 is a class type) and can be 1800 // implicitly converted to an lvalue of type “cv3 T3,” 1801 // where “cv1 T1” is reference-compatible with “cv3 T3” 1802 // 92) (this conversion is selected by enumerating the 1803 // applicable conversion functions (13.3.1.6) and choosing 1804 // the best one through overload resolution (13.3)), 1805 if (!SuppressUserConversions && T2->isRecordType()) { 1806 // FIXME: Look for conversions in base classes! 1807 CXXRecordDecl *T2RecordDecl 1808 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1809 1810 OverloadCandidateSet CandidateSet; 1811 OverloadedFunctionDecl *Conversions 1812 = T2RecordDecl->getConversionFunctions(); 1813 for (OverloadedFunctionDecl::function_iterator Func 1814 = Conversions->function_begin(); 1815 Func != Conversions->function_end(); ++Func) { 1816 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1817 1818 // If the conversion function doesn't return a reference type, 1819 // it can't be considered for this conversion. 1820 // FIXME: This will change when we support rvalue references. 1821 if (Conv->getConversionType()->isReferenceType() && 1822 (AllowExplicit || !Conv->isExplicit())) 1823 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1824 } 1825 1826 OverloadCandidateSet::iterator Best; 1827 switch (BestViableFunction(CandidateSet, Best)) { 1828 case OR_Success: 1829 // This is a direct binding. 1830 BindsDirectly = true; 1831 1832 if (ICS) { 1833 // C++ [over.ics.ref]p1: 1834 // 1835 // [...] If the parameter binds directly to the result of 1836 // applying a conversion function to the argument 1837 // expression, the implicit conversion sequence is a 1838 // user-defined conversion sequence (13.3.3.1.2), with the 1839 // second standard conversion sequence either an identity 1840 // conversion or, if the conversion function returns an 1841 // entity of a type that is a derived class of the parameter 1842 // type, a derived-to-base Conversion. 1843 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1844 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1845 ICS->UserDefined.After = Best->FinalConversion; 1846 ICS->UserDefined.ConversionFunction = Best->Function; 1847 assert(ICS->UserDefined.After.ReferenceBinding && 1848 ICS->UserDefined.After.DirectBinding && 1849 "Expected a direct reference binding!"); 1850 return false; 1851 } else { 1852 // Perform the conversion. 1853 // FIXME: Binding to a subobject of the lvalue is going to require 1854 // more AST annotation than this. 1855 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1856 } 1857 break; 1858 1859 case OR_Ambiguous: 1860 assert(false && "Ambiguous reference binding conversions not implemented."); 1861 return true; 1862 1863 case OR_No_Viable_Function: 1864 // There was no suitable conversion; continue with other checks. 1865 break; 1866 } 1867 } 1868 1869 if (BindsDirectly) { 1870 // C++ [dcl.init.ref]p4: 1871 // [...] In all cases where the reference-related or 1872 // reference-compatible relationship of two types is used to 1873 // establish the validity of a reference binding, and T1 is a 1874 // base class of T2, a program that necessitates such a binding 1875 // is ill-formed if T1 is an inaccessible (clause 11) or 1876 // ambiguous (10.2) base class of T2. 1877 // 1878 // Note that we only check this condition when we're allowed to 1879 // complain about errors, because we should not be checking for 1880 // ambiguity (or inaccessibility) unless the reference binding 1881 // actually happens. 1882 if (DerivedToBase) 1883 return CheckDerivedToBaseConversion(T2, T1, 1884 Init->getSourceRange().getBegin(), 1885 Init->getSourceRange()); 1886 else 1887 return false; 1888 } 1889 1890 // -- Otherwise, the reference shall be to a non-volatile const 1891 // type (i.e., cv1 shall be const). 1892 if (T1.getCVRQualifiers() != QualType::Const) { 1893 if (!ICS) 1894 Diag(Init->getSourceRange().getBegin(), 1895 diag::err_not_reference_to_const_init) 1896 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1897 << T2 << Init->getSourceRange(); 1898 return true; 1899 } 1900 1901 // -- If the initializer expression is an rvalue, with T2 a 1902 // class type, and “cv1 T1” is reference-compatible with 1903 // “cv2 T2,” the reference is bound in one of the 1904 // following ways (the choice is implementation-defined): 1905 // 1906 // -- The reference is bound to the object represented by 1907 // the rvalue (see 3.10) or to a sub-object within that 1908 // object. 1909 // 1910 // -- A temporary of type “cv1 T2” [sic] is created, and 1911 // a constructor is called to copy the entire rvalue 1912 // object into the temporary. The reference is bound to 1913 // the temporary or to a sub-object within the 1914 // temporary. 1915 // 1916 // The constructor that would be used to make the copy 1917 // shall be callable whether or not the copy is actually 1918 // done. 1919 // 1920 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1921 // freedom, so we will always take the first option and never build 1922 // a temporary in this case. FIXME: We will, however, have to check 1923 // for the presence of a copy constructor in C++98/03 mode. 1924 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1925 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1926 if (ICS) { 1927 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1928 ICS->Standard.First = ICK_Identity; 1929 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1930 ICS->Standard.Third = ICK_Identity; 1931 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1932 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1933 ICS->Standard.ReferenceBinding = true; 1934 ICS->Standard.DirectBinding = false; 1935 } else { 1936 // FIXME: Binding to a subobject of the rvalue is going to require 1937 // more AST annotation than this. 1938 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1939 } 1940 return false; 1941 } 1942 1943 // -- Otherwise, a temporary of type “cv1 T1” is created and 1944 // initialized from the initializer expression using the 1945 // rules for a non-reference copy initialization (8.5). The 1946 // reference is then bound to the temporary. If T1 is 1947 // reference-related to T2, cv1 must be the same 1948 // cv-qualification as, or greater cv-qualification than, 1949 // cv2; otherwise, the program is ill-formed. 1950 if (RefRelationship == Ref_Related) { 1951 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1952 // we would be reference-compatible or reference-compatible with 1953 // added qualification. But that wasn't the case, so the reference 1954 // initialization fails. 1955 if (!ICS) 1956 Diag(Init->getSourceRange().getBegin(), 1957 diag::err_reference_init_drops_quals) 1958 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1959 << T2 << Init->getSourceRange(); 1960 return true; 1961 } 1962 1963 // If at least one of the types is a class type, the types are not 1964 // related, and we aren't allowed any user conversions, the 1965 // reference binding fails. This case is important for breaking 1966 // recursion, since TryImplicitConversion below will attempt to 1967 // create a temporary through the use of a copy constructor. 1968 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 1969 (T1->isRecordType() || T2->isRecordType())) { 1970 if (!ICS) 1971 Diag(Init->getSourceRange().getBegin(), 1972 diag::err_typecheck_convert_incompatible) 1973 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 1974 return true; 1975 } 1976 1977 // Actually try to convert the initializer to T1. 1978 if (ICS) { 1979 /// C++ [over.ics.ref]p2: 1980 /// 1981 /// When a parameter of reference type is not bound directly to 1982 /// an argument expression, the conversion sequence is the one 1983 /// required to convert the argument expression to the 1984 /// underlying type of the reference according to 1985 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 1986 /// to copy-initializing a temporary of the underlying type with 1987 /// the argument expression. Any difference in top-level 1988 /// cv-qualification is subsumed by the initialization itself 1989 /// and does not constitute a conversion. 1990 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 1991 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 1992 } else { 1993 return PerformImplicitConversion(Init, T1, "initializing"); 1994 } 1995} 1996 1997/// CheckOverloadedOperatorDeclaration - Check whether the declaration 1998/// of this overloaded operator is well-formed. If so, returns false; 1999/// otherwise, emits appropriate diagnostics and returns true. 2000bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2001 assert(FnDecl && FnDecl->isOverloadedOperator() && 2002 "Expected an overloaded operator declaration"); 2003 2004 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2005 2006 // C++ [over.oper]p5: 2007 // The allocation and deallocation functions, operator new, 2008 // operator new[], operator delete and operator delete[], are 2009 // described completely in 3.7.3. The attributes and restrictions 2010 // found in the rest of this subclause do not apply to them unless 2011 // explicitly stated in 3.7.3. 2012 // FIXME: Write a separate routine for checking this. For now, just 2013 // allow it. 2014 if (Op == OO_New || Op == OO_Array_New || 2015 Op == OO_Delete || Op == OO_Array_Delete) 2016 return false; 2017 2018 // C++ [over.oper]p6: 2019 // An operator function shall either be a non-static member 2020 // function or be a non-member function and have at least one 2021 // parameter whose type is a class, a reference to a class, an 2022 // enumeration, or a reference to an enumeration. 2023 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2024 if (MethodDecl->isStatic()) 2025 return Diag(FnDecl->getLocation(), 2026 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2027 } else { 2028 bool ClassOrEnumParam = false; 2029 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2030 ParamEnd = FnDecl->param_end(); 2031 Param != ParamEnd; ++Param) { 2032 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2033 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2034 ClassOrEnumParam = true; 2035 break; 2036 } 2037 } 2038 2039 if (!ClassOrEnumParam) 2040 return Diag(FnDecl->getLocation(), 2041 diag::err_operator_overload_needs_class_or_enum) 2042 << FnDecl->getDeclName(); 2043 } 2044 2045 // C++ [over.oper]p8: 2046 // An operator function cannot have default arguments (8.3.6), 2047 // except where explicitly stated below. 2048 // 2049 // Only the function-call operator allows default arguments 2050 // (C++ [over.call]p1). 2051 if (Op != OO_Call) { 2052 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2053 Param != FnDecl->param_end(); ++Param) { 2054 if ((*Param)->hasUnparsedDefaultArg()) 2055 return Diag((*Param)->getLocation(), 2056 diag::err_operator_overload_default_arg) 2057 << FnDecl->getDeclName(); 2058 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2059 return Diag((*Param)->getLocation(), 2060 diag::err_operator_overload_default_arg) 2061 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2062 } 2063 } 2064 2065 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2066 { false, false, false } 2067#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2068 , { Unary, Binary, MemberOnly } 2069#include "clang/Basic/OperatorKinds.def" 2070 }; 2071 2072 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2073 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2074 bool MustBeMemberOperator = OperatorUses[Op][2]; 2075 2076 // C++ [over.oper]p8: 2077 // [...] Operator functions cannot have more or fewer parameters 2078 // than the number required for the corresponding operator, as 2079 // described in the rest of this subclause. 2080 unsigned NumParams = FnDecl->getNumParams() 2081 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2082 if (Op != OO_Call && 2083 ((NumParams == 1 && !CanBeUnaryOperator) || 2084 (NumParams == 2 && !CanBeBinaryOperator) || 2085 (NumParams < 1) || (NumParams > 2))) { 2086 // We have the wrong number of parameters. 2087 unsigned ErrorKind; 2088 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2089 ErrorKind = 2; // 2 -> unary or binary. 2090 } else if (CanBeUnaryOperator) { 2091 ErrorKind = 0; // 0 -> unary 2092 } else { 2093 assert(CanBeBinaryOperator && 2094 "All non-call overloaded operators are unary or binary!"); 2095 ErrorKind = 1; // 1 -> binary 2096 } 2097 2098 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2099 << FnDecl->getDeclName() << NumParams << ErrorKind; 2100 } 2101 2102 // Overloaded operators other than operator() cannot be variadic. 2103 if (Op != OO_Call && 2104 FnDecl->getType()->getAsFunctionTypeProto()->isVariadic()) { 2105 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2106 << FnDecl->getDeclName(); 2107 } 2108 2109 // Some operators must be non-static member functions. 2110 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2111 return Diag(FnDecl->getLocation(), 2112 diag::err_operator_overload_must_be_member) 2113 << FnDecl->getDeclName(); 2114 } 2115 2116 // C++ [over.inc]p1: 2117 // The user-defined function called operator++ implements the 2118 // prefix and postfix ++ operator. If this function is a member 2119 // function with no parameters, or a non-member function with one 2120 // parameter of class or enumeration type, it defines the prefix 2121 // increment operator ++ for objects of that type. If the function 2122 // is a member function with one parameter (which shall be of type 2123 // int) or a non-member function with two parameters (the second 2124 // of which shall be of type int), it defines the postfix 2125 // increment operator ++ for objects of that type. 2126 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2127 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2128 bool ParamIsInt = false; 2129 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2130 ParamIsInt = BT->getKind() == BuiltinType::Int; 2131 2132 if (!ParamIsInt) 2133 return Diag(LastParam->getLocation(), 2134 diag::err_operator_overload_post_incdec_must_be_int) 2135 << LastParam->getType() << (Op == OO_MinusMinus); 2136 } 2137 2138 // Notify the class if it got an assignment operator. 2139 if (Op == OO_Equal) { 2140 // Would have returned earlier otherwise. 2141 assert(isa<CXXMethodDecl>(FnDecl) && 2142 "Overloaded = not member, but not filtered."); 2143 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2144 Method->getParent()->addedAssignmentOperator(Context, Method); 2145 } 2146 2147 return false; 2148} 2149 2150/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2151/// linkage specification, including the language and (if present) 2152/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2153/// the location of the language string literal, which is provided 2154/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2155/// the '{' brace. Otherwise, this linkage specification does not 2156/// have any braces. 2157Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2158 SourceLocation ExternLoc, 2159 SourceLocation LangLoc, 2160 const char *Lang, 2161 unsigned StrSize, 2162 SourceLocation LBraceLoc) { 2163 LinkageSpecDecl::LanguageIDs Language; 2164 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2165 Language = LinkageSpecDecl::lang_c; 2166 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2167 Language = LinkageSpecDecl::lang_cxx; 2168 else { 2169 Diag(LangLoc, diag::err_bad_language); 2170 return 0; 2171 } 2172 2173 // FIXME: Add all the various semantics of linkage specifications 2174 2175 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2176 LangLoc, Language, 2177 LBraceLoc.isValid()); 2178 CurContext->addDecl(D); 2179 PushDeclContext(S, D); 2180 return D; 2181} 2182 2183/// ActOnFinishLinkageSpecification - Completely the definition of 2184/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2185/// valid, it's the position of the closing '}' brace in a linkage 2186/// specification that uses braces. 2187Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2188 DeclTy *LinkageSpec, 2189 SourceLocation RBraceLoc) { 2190 if (LinkageSpec) 2191 PopDeclContext(); 2192 return LinkageSpec; 2193} 2194 2195/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2196/// handler. 2197Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2198{ 2199 QualType ExDeclType = GetTypeForDeclarator(D, S); 2200 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2201 2202 bool Invalid = false; 2203 2204 // Arrays and functions decay. 2205 if (ExDeclType->isArrayType()) 2206 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2207 else if (ExDeclType->isFunctionType()) 2208 ExDeclType = Context.getPointerType(ExDeclType); 2209 2210 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2211 // The exception-declaration shall not denote a pointer or reference to an 2212 // incomplete type, other than [cv] void*. 2213 QualType BaseType = ExDeclType; 2214 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2215 unsigned DK = diag::err_catch_incomplete; 2216 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2217 BaseType = Ptr->getPointeeType(); 2218 Mode = 1; 2219 DK = diag::err_catch_incomplete_ptr; 2220 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2221 BaseType = Ref->getPointeeType(); 2222 Mode = 2; 2223 DK = diag::err_catch_incomplete_ref; 2224 } 2225 if ((Mode == 0 || !BaseType->isVoidType()) && 2226 DiagnoseIncompleteType(Begin, BaseType, DK)) 2227 Invalid = true; 2228 2229 // FIXME: Need to test for ability to copy-construct and destroy the 2230 // exception variable. 2231 // FIXME: Need to check for abstract classes. 2232 2233 IdentifierInfo *II = D.getIdentifier(); 2234 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2235 // The scope should be freshly made just for us. There is just no way 2236 // it contains any previous declaration. 2237 assert(!S->isDeclScope(PrevDecl)); 2238 if (PrevDecl->isTemplateParameter()) { 2239 // Maybe we will complain about the shadowed template parameter. 2240 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2241 2242 } 2243 } 2244 2245 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2246 II, ExDeclType, VarDecl::None, Begin); 2247 if (D.getInvalidType() || Invalid) 2248 ExDecl->setInvalidDecl(); 2249 2250 if (D.getCXXScopeSpec().isSet()) { 2251 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2252 << D.getCXXScopeSpec().getRange(); 2253 ExDecl->setInvalidDecl(); 2254 } 2255 2256 // Add the exception declaration into this scope. 2257 S->AddDecl(ExDecl); 2258 if (II) 2259 IdResolver.AddDecl(ExDecl); 2260 2261 ProcessDeclAttributes(ExDecl, D); 2262 return ExDecl; 2263} 2264