SemaDeclCXX.cpp revision b696ea3a0693798daeafd896d77f0b8f1fec3cc5
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 ActOnFields(S, RLoc, TagDecl, 761 (DeclTy**)FieldCollector->getCurFields(), 762 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 763 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 764} 765 766/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 767/// special functions, such as the default constructor, copy 768/// constructor, or destructor, to the given C++ class (C++ 769/// [special]p1). This routine can only be executed just before the 770/// definition of the class is complete. 771void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 772 QualType ClassType = Context.getTypeDeclType(ClassDecl); 773 ClassType = Context.getCanonicalType(ClassType); 774 775 if (!ClassDecl->hasUserDeclaredConstructor()) { 776 // C++ [class.ctor]p5: 777 // A default constructor for a class X is a constructor of class X 778 // that can be called without an argument. If there is no 779 // user-declared constructor for class X, a default constructor is 780 // implicitly declared. An implicitly-declared default constructor 781 // is an inline public member of its class. 782 DeclarationName Name 783 = Context.DeclarationNames.getCXXConstructorName(ClassType); 784 CXXConstructorDecl *DefaultCon = 785 CXXConstructorDecl::Create(Context, ClassDecl, 786 ClassDecl->getLocation(), Name, 787 Context.getFunctionType(Context.VoidTy, 788 0, 0, false, 0), 789 /*isExplicit=*/false, 790 /*isInline=*/true, 791 /*isImplicitlyDeclared=*/true); 792 DefaultCon->setAccess(AS_public); 793 DefaultCon->setImplicit(); 794 ClassDecl->addDecl(DefaultCon); 795 796 // Notify the class that we've added a constructor. 797 ClassDecl->addedConstructor(Context, DefaultCon); 798 } 799 800 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 801 // C++ [class.copy]p4: 802 // If the class definition does not explicitly declare a copy 803 // constructor, one is declared implicitly. 804 805 // C++ [class.copy]p5: 806 // The implicitly-declared copy constructor for a class X will 807 // have the form 808 // 809 // X::X(const X&) 810 // 811 // if 812 bool HasConstCopyConstructor = true; 813 814 // -- each direct or virtual base class B of X has a copy 815 // constructor whose first parameter is of type const B& or 816 // const volatile B&, and 817 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 818 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 819 const CXXRecordDecl *BaseClassDecl 820 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 821 HasConstCopyConstructor 822 = BaseClassDecl->hasConstCopyConstructor(Context); 823 } 824 825 // -- for all the nonstatic data members of X that are of a 826 // class type M (or array thereof), each such class type 827 // has a copy constructor whose first parameter is of type 828 // const M& or const volatile M&. 829 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 830 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 831 QualType FieldType = (*Field)->getType(); 832 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 833 FieldType = Array->getElementType(); 834 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 835 const CXXRecordDecl *FieldClassDecl 836 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 837 HasConstCopyConstructor 838 = FieldClassDecl->hasConstCopyConstructor(Context); 839 } 840 } 841 842 // Otherwise, the implicitly declared copy constructor will have 843 // the form 844 // 845 // X::X(X&) 846 QualType ArgType = ClassType; 847 if (HasConstCopyConstructor) 848 ArgType = ArgType.withConst(); 849 ArgType = Context.getReferenceType(ArgType); 850 851 // An implicitly-declared copy constructor is an inline public 852 // member of its class. 853 DeclarationName Name 854 = Context.DeclarationNames.getCXXConstructorName(ClassType); 855 CXXConstructorDecl *CopyConstructor 856 = CXXConstructorDecl::Create(Context, ClassDecl, 857 ClassDecl->getLocation(), Name, 858 Context.getFunctionType(Context.VoidTy, 859 &ArgType, 1, 860 false, 0), 861 /*isExplicit=*/false, 862 /*isInline=*/true, 863 /*isImplicitlyDeclared=*/true); 864 CopyConstructor->setAccess(AS_public); 865 CopyConstructor->setImplicit(); 866 867 // Add the parameter to the constructor. 868 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 869 ClassDecl->getLocation(), 870 /*IdentifierInfo=*/0, 871 ArgType, VarDecl::None, 0); 872 CopyConstructor->setParams(Context, &FromParam, 1); 873 874 ClassDecl->addedConstructor(Context, CopyConstructor); 875 ClassDecl->addDecl(CopyConstructor); 876 } 877 878 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 879 // Note: The following rules are largely analoguous to the copy 880 // constructor rules. Note that virtual bases are not taken into account 881 // for determining the argument type of the operator. Note also that 882 // operators taking an object instead of a reference are allowed. 883 // 884 // C++ [class.copy]p10: 885 // If the class definition does not explicitly declare a copy 886 // assignment operator, one is declared implicitly. 887 // The implicitly-defined copy assignment operator for a class X 888 // will have the form 889 // 890 // X& X::operator=(const X&) 891 // 892 // if 893 bool HasConstCopyAssignment = true; 894 895 // -- each direct base class B of X has a copy assignment operator 896 // whose parameter is of type const B&, const volatile B& or B, 897 // and 898 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 899 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 900 const CXXRecordDecl *BaseClassDecl 901 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 902 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 903 } 904 905 // -- for all the nonstatic data members of X that are of a class 906 // type M (or array thereof), each such class type has a copy 907 // assignment operator whose parameter is of type const M&, 908 // const volatile M& or M. 909 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 910 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 911 QualType FieldType = (*Field)->getType(); 912 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 913 FieldType = Array->getElementType(); 914 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 915 const CXXRecordDecl *FieldClassDecl 916 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 917 HasConstCopyAssignment 918 = FieldClassDecl->hasConstCopyAssignment(Context); 919 } 920 } 921 922 // Otherwise, the implicitly declared copy assignment operator will 923 // have the form 924 // 925 // X& X::operator=(X&) 926 QualType ArgType = ClassType; 927 QualType RetType = Context.getReferenceType(ArgType); 928 if (HasConstCopyAssignment) 929 ArgType = ArgType.withConst(); 930 ArgType = Context.getReferenceType(ArgType); 931 932 // An implicitly-declared copy assignment operator is an inline public 933 // member of its class. 934 DeclarationName Name = 935 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 936 CXXMethodDecl *CopyAssignment = 937 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 938 Context.getFunctionType(RetType, &ArgType, 1, 939 false, 0), 940 /*isStatic=*/false, /*isInline=*/true); 941 CopyAssignment->setAccess(AS_public); 942 CopyAssignment->setImplicit(); 943 944 // Add the parameter to the operator. 945 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 946 ClassDecl->getLocation(), 947 /*IdentifierInfo=*/0, 948 ArgType, VarDecl::None, 0); 949 CopyAssignment->setParams(Context, &FromParam, 1); 950 951 // Don't call addedAssignmentOperator. There is no way to distinguish an 952 // implicit from an explicit assignment operator. 953 ClassDecl->addDecl(CopyAssignment); 954 } 955 956 if (!ClassDecl->hasUserDeclaredDestructor()) { 957 // C++ [class.dtor]p2: 958 // If a class has no user-declared destructor, a destructor is 959 // declared implicitly. An implicitly-declared destructor is an 960 // inline public member of its class. 961 DeclarationName Name 962 = Context.DeclarationNames.getCXXDestructorName(ClassType); 963 CXXDestructorDecl *Destructor 964 = CXXDestructorDecl::Create(Context, ClassDecl, 965 ClassDecl->getLocation(), Name, 966 Context.getFunctionType(Context.VoidTy, 967 0, 0, false, 0), 968 /*isInline=*/true, 969 /*isImplicitlyDeclared=*/true); 970 Destructor->setAccess(AS_public); 971 Destructor->setImplicit(); 972 ClassDecl->addDecl(Destructor); 973 } 974} 975 976/// ActOnStartDelayedCXXMethodDeclaration - We have completed 977/// parsing a top-level (non-nested) C++ class, and we are now 978/// parsing those parts of the given Method declaration that could 979/// not be parsed earlier (C++ [class.mem]p2), such as default 980/// arguments. This action should enter the scope of the given 981/// Method declaration as if we had just parsed the qualified method 982/// name. However, it should not bring the parameters into scope; 983/// that will be performed by ActOnDelayedCXXMethodParameter. 984void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 985 CXXScopeSpec SS; 986 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 987 ActOnCXXEnterDeclaratorScope(S, SS); 988} 989 990/// ActOnDelayedCXXMethodParameter - We've already started a delayed 991/// C++ method declaration. We're (re-)introducing the given 992/// function parameter into scope for use in parsing later parts of 993/// the method declaration. For example, we could see an 994/// ActOnParamDefaultArgument event for this parameter. 995void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 996 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 997 998 // If this parameter has an unparsed default argument, clear it out 999 // to make way for the parsed default argument. 1000 if (Param->hasUnparsedDefaultArg()) 1001 Param->setDefaultArg(0); 1002 1003 S->AddDecl(Param); 1004 if (Param->getDeclName()) 1005 IdResolver.AddDecl(Param); 1006} 1007 1008/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1009/// processing the delayed method declaration for Method. The method 1010/// declaration is now considered finished. There may be a separate 1011/// ActOnStartOfFunctionDef action later (not necessarily 1012/// immediately!) for this method, if it was also defined inside the 1013/// class body. 1014void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1015 FunctionDecl *Method = (FunctionDecl*)MethodD; 1016 CXXScopeSpec SS; 1017 SS.setScopeRep(Method->getDeclContext()); 1018 ActOnCXXExitDeclaratorScope(S, SS); 1019 1020 // Now that we have our default arguments, check the constructor 1021 // again. It could produce additional diagnostics or affect whether 1022 // the class has implicitly-declared destructors, among other 1023 // things. 1024 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1025 if (CheckConstructor(Constructor)) 1026 Constructor->setInvalidDecl(); 1027 } 1028 1029 // Check the default arguments, which we may have added. 1030 if (!Method->isInvalidDecl()) 1031 CheckCXXDefaultArguments(Method); 1032} 1033 1034/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1035/// the well-formedness of the constructor declarator @p D with type @p 1036/// R. If there are any errors in the declarator, this routine will 1037/// emit diagnostics and return true. Otherwise, it will return 1038/// false. Either way, the type @p R will be updated to reflect a 1039/// well-formed type for the constructor. 1040bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1041 FunctionDecl::StorageClass& SC) { 1042 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1043 bool isInvalid = false; 1044 1045 // C++ [class.ctor]p3: 1046 // A constructor shall not be virtual (10.3) or static (9.4). A 1047 // constructor can be invoked for a const, volatile or const 1048 // volatile object. A constructor shall not be declared const, 1049 // volatile, or const volatile (9.3.2). 1050 if (isVirtual) { 1051 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1052 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1053 << SourceRange(D.getIdentifierLoc()); 1054 isInvalid = true; 1055 } 1056 if (SC == FunctionDecl::Static) { 1057 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1058 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1059 << SourceRange(D.getIdentifierLoc()); 1060 isInvalid = true; 1061 SC = FunctionDecl::None; 1062 } 1063 if (D.getDeclSpec().hasTypeSpecifier()) { 1064 // Constructors don't have return types, but the parser will 1065 // happily parse something like: 1066 // 1067 // class X { 1068 // float X(float); 1069 // }; 1070 // 1071 // The return type will be eliminated later. 1072 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1073 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1074 << SourceRange(D.getIdentifierLoc()); 1075 } 1076 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1077 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1078 if (FTI.TypeQuals & QualType::Const) 1079 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1080 << "const" << SourceRange(D.getIdentifierLoc()); 1081 if (FTI.TypeQuals & QualType::Volatile) 1082 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1083 << "volatile" << SourceRange(D.getIdentifierLoc()); 1084 if (FTI.TypeQuals & QualType::Restrict) 1085 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1086 << "restrict" << SourceRange(D.getIdentifierLoc()); 1087 } 1088 1089 // Rebuild the function type "R" without any type qualifiers (in 1090 // case any of the errors above fired) and with "void" as the 1091 // return type, since constructors don't have return types. We 1092 // *always* have to do this, because GetTypeForDeclarator will 1093 // put in a result type of "int" when none was specified. 1094 const FunctionTypeProto *Proto = R->getAsFunctionTypeProto(); 1095 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1096 Proto->getNumArgs(), 1097 Proto->isVariadic(), 1098 0); 1099 1100 return isInvalid; 1101} 1102 1103/// CheckConstructor - Checks a fully-formed constructor for 1104/// well-formedness, issuing any diagnostics required. Returns true if 1105/// the constructor declarator is invalid. 1106bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1107 if (Constructor->isInvalidDecl()) 1108 return true; 1109 1110 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1111 bool Invalid = false; 1112 1113 // C++ [class.copy]p3: 1114 // A declaration of a constructor for a class X is ill-formed if 1115 // its first parameter is of type (optionally cv-qualified) X and 1116 // either there are no other parameters or else all other 1117 // parameters have default arguments. 1118 if ((Constructor->getNumParams() == 1) || 1119 (Constructor->getNumParams() > 1 && 1120 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1121 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1122 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1123 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1124 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1125 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1126 Invalid = true; 1127 } 1128 } 1129 1130 // Notify the class that we've added a constructor. 1131 ClassDecl->addedConstructor(Context, Constructor); 1132 1133 return Invalid; 1134} 1135 1136/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1137/// the well-formednes of the destructor declarator @p D with type @p 1138/// R. If there are any errors in the declarator, this routine will 1139/// emit diagnostics and return true. Otherwise, it will return 1140/// false. Either way, the type @p R will be updated to reflect a 1141/// well-formed type for the destructor. 1142bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1143 FunctionDecl::StorageClass& SC) { 1144 bool isInvalid = false; 1145 1146 // C++ [class.dtor]p1: 1147 // [...] A typedef-name that names a class is a class-name 1148 // (7.1.3); however, a typedef-name that names a class shall not 1149 // be used as the identifier in the declarator for a destructor 1150 // declaration. 1151 TypeDecl *DeclaratorTypeD = (TypeDecl *)D.getDeclaratorIdType(); 1152 if (const TypedefDecl *TypedefD = dyn_cast<TypedefDecl>(DeclaratorTypeD)) { 1153 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1154 << TypedefD->getDeclName(); 1155 isInvalid = true; 1156 } 1157 1158 // C++ [class.dtor]p2: 1159 // A destructor is used to destroy objects of its class type. A 1160 // destructor takes no parameters, and no return type can be 1161 // specified for it (not even void). The address of a destructor 1162 // shall not be taken. A destructor shall not be static. A 1163 // destructor can be invoked for a const, volatile or const 1164 // volatile object. A destructor shall not be declared const, 1165 // volatile or const volatile (9.3.2). 1166 if (SC == FunctionDecl::Static) { 1167 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1168 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1169 << SourceRange(D.getIdentifierLoc()); 1170 isInvalid = true; 1171 SC = FunctionDecl::None; 1172 } 1173 if (D.getDeclSpec().hasTypeSpecifier()) { 1174 // Destructors don't have return types, but the parser will 1175 // happily parse something like: 1176 // 1177 // class X { 1178 // float ~X(); 1179 // }; 1180 // 1181 // The return type will be eliminated later. 1182 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1183 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1184 << SourceRange(D.getIdentifierLoc()); 1185 } 1186 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1187 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1188 if (FTI.TypeQuals & QualType::Const) 1189 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1190 << "const" << SourceRange(D.getIdentifierLoc()); 1191 if (FTI.TypeQuals & QualType::Volatile) 1192 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1193 << "volatile" << SourceRange(D.getIdentifierLoc()); 1194 if (FTI.TypeQuals & QualType::Restrict) 1195 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1196 << "restrict" << SourceRange(D.getIdentifierLoc()); 1197 } 1198 1199 // Make sure we don't have any parameters. 1200 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1201 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1202 1203 // Delete the parameters. 1204 D.getTypeObject(0).Fun.freeArgs(); 1205 } 1206 1207 // Make sure the destructor isn't variadic. 1208 if (R->getAsFunctionTypeProto()->isVariadic()) 1209 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1210 1211 // Rebuild the function type "R" without any type qualifiers or 1212 // parameters (in case any of the errors above fired) and with 1213 // "void" as the return type, since destructors don't have return 1214 // types. We *always* have to do this, because GetTypeForDeclarator 1215 // will put in a result type of "int" when none was specified. 1216 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1217 1218 return isInvalid; 1219} 1220 1221/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1222/// well-formednes of the conversion function declarator @p D with 1223/// type @p R. If there are any errors in the declarator, this routine 1224/// will emit diagnostics and return true. Otherwise, it will return 1225/// false. Either way, the type @p R will be updated to reflect a 1226/// well-formed type for the conversion operator. 1227bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1228 FunctionDecl::StorageClass& SC) { 1229 bool isInvalid = false; 1230 1231 // C++ [class.conv.fct]p1: 1232 // Neither parameter types nor return type can be specified. The 1233 // type of a conversion function (8.3.5) is “function taking no 1234 // parameter returning conversion-type-id.” 1235 if (SC == FunctionDecl::Static) { 1236 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1237 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1238 << SourceRange(D.getIdentifierLoc()); 1239 isInvalid = true; 1240 SC = FunctionDecl::None; 1241 } 1242 if (D.getDeclSpec().hasTypeSpecifier()) { 1243 // Conversion functions don't have return types, but the parser will 1244 // happily parse something like: 1245 // 1246 // class X { 1247 // float operator bool(); 1248 // }; 1249 // 1250 // The return type will be changed later anyway. 1251 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1252 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1253 << SourceRange(D.getIdentifierLoc()); 1254 } 1255 1256 // Make sure we don't have any parameters. 1257 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1258 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1259 1260 // Delete the parameters. 1261 D.getTypeObject(0).Fun.freeArgs(); 1262 } 1263 1264 // Make sure the conversion function isn't variadic. 1265 if (R->getAsFunctionTypeProto()->isVariadic()) 1266 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1267 1268 // C++ [class.conv.fct]p4: 1269 // The conversion-type-id shall not represent a function type nor 1270 // an array type. 1271 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1272 if (ConvType->isArrayType()) { 1273 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1274 ConvType = Context.getPointerType(ConvType); 1275 } else if (ConvType->isFunctionType()) { 1276 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1277 ConvType = Context.getPointerType(ConvType); 1278 } 1279 1280 // Rebuild the function type "R" without any parameters (in case any 1281 // of the errors above fired) and with the conversion type as the 1282 // return type. 1283 R = Context.getFunctionType(ConvType, 0, 0, false, 1284 R->getAsFunctionTypeProto()->getTypeQuals()); 1285 1286 // C++0x explicit conversion operators. 1287 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1288 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1289 diag::warn_explicit_conversion_functions) 1290 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1291 1292 return isInvalid; 1293} 1294 1295/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1296/// the declaration of the given C++ conversion function. This routine 1297/// is responsible for recording the conversion function in the C++ 1298/// class, if possible. 1299Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1300 assert(Conversion && "Expected to receive a conversion function declaration"); 1301 1302 // Set the lexical context of this conversion function 1303 Conversion->setLexicalDeclContext(CurContext); 1304 1305 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1306 1307 // Make sure we aren't redeclaring the conversion function. 1308 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1309 1310 // C++ [class.conv.fct]p1: 1311 // [...] A conversion function is never used to convert a 1312 // (possibly cv-qualified) object to the (possibly cv-qualified) 1313 // same object type (or a reference to it), to a (possibly 1314 // cv-qualified) base class of that type (or a reference to it), 1315 // or to (possibly cv-qualified) void. 1316 // FIXME: Suppress this warning if the conversion function ends up 1317 // being a virtual function that overrides a virtual function in a 1318 // base class. 1319 QualType ClassType 1320 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1321 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1322 ConvType = ConvTypeRef->getPointeeType(); 1323 if (ConvType->isRecordType()) { 1324 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1325 if (ConvType == ClassType) 1326 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1327 << ClassType; 1328 else if (IsDerivedFrom(ClassType, ConvType)) 1329 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1330 << ClassType << ConvType; 1331 } else if (ConvType->isVoidType()) { 1332 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1333 << ClassType << ConvType; 1334 } 1335 1336 if (Conversion->getPreviousDeclaration()) { 1337 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1338 for (OverloadedFunctionDecl::function_iterator 1339 Conv = Conversions->function_begin(), 1340 ConvEnd = Conversions->function_end(); 1341 Conv != ConvEnd; ++Conv) { 1342 if (*Conv == Conversion->getPreviousDeclaration()) { 1343 *Conv = Conversion; 1344 return (DeclTy *)Conversion; 1345 } 1346 } 1347 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1348 } else 1349 ClassDecl->addConversionFunction(Context, Conversion); 1350 1351 return (DeclTy *)Conversion; 1352} 1353 1354//===----------------------------------------------------------------------===// 1355// Namespace Handling 1356//===----------------------------------------------------------------------===// 1357 1358/// ActOnStartNamespaceDef - This is called at the start of a namespace 1359/// definition. 1360Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1361 SourceLocation IdentLoc, 1362 IdentifierInfo *II, 1363 SourceLocation LBrace) { 1364 NamespaceDecl *Namespc = 1365 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1366 Namespc->setLBracLoc(LBrace); 1367 1368 Scope *DeclRegionScope = NamespcScope->getParent(); 1369 1370 if (II) { 1371 // C++ [namespace.def]p2: 1372 // The identifier in an original-namespace-definition shall not have been 1373 // previously defined in the declarative region in which the 1374 // original-namespace-definition appears. The identifier in an 1375 // original-namespace-definition is the name of the namespace. Subsequently 1376 // in that declarative region, it is treated as an original-namespace-name. 1377 1378 Decl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1379 true); 1380 1381 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1382 // This is an extended namespace definition. 1383 // Attach this namespace decl to the chain of extended namespace 1384 // definitions. 1385 OrigNS->setNextNamespace(Namespc); 1386 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1387 1388 // Remove the previous declaration from the scope. 1389 if (DeclRegionScope->isDeclScope(OrigNS)) { 1390 IdResolver.RemoveDecl(OrigNS); 1391 DeclRegionScope->RemoveDecl(OrigNS); 1392 } 1393 } else if (PrevDecl) { 1394 // This is an invalid name redefinition. 1395 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1396 << Namespc->getDeclName(); 1397 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1398 Namespc->setInvalidDecl(); 1399 // Continue on to push Namespc as current DeclContext and return it. 1400 } 1401 1402 PushOnScopeChains(Namespc, DeclRegionScope); 1403 } else { 1404 // FIXME: Handle anonymous namespaces 1405 } 1406 1407 // Although we could have an invalid decl (i.e. the namespace name is a 1408 // redefinition), push it as current DeclContext and try to continue parsing. 1409 // FIXME: We should be able to push Namespc here, so that the 1410 // each DeclContext for the namespace has the declarations 1411 // that showed up in that particular namespace definition. 1412 PushDeclContext(NamespcScope, Namespc); 1413 return Namespc; 1414} 1415 1416/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1417/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1418void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1419 Decl *Dcl = static_cast<Decl *>(D); 1420 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1421 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1422 Namespc->setRBracLoc(RBrace); 1423 PopDeclContext(); 1424} 1425 1426Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1427 SourceLocation UsingLoc, 1428 SourceLocation NamespcLoc, 1429 const CXXScopeSpec &SS, 1430 SourceLocation IdentLoc, 1431 IdentifierInfo *NamespcName, 1432 AttributeList *AttrList) { 1433 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1434 assert(NamespcName && "Invalid NamespcName."); 1435 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1436 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1437 1438 UsingDirectiveDecl *UDir = 0; 1439 1440 // Lookup namespace name. 1441 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1442 LookupNamespaceName, false); 1443 if (R.isAmbiguous()) { 1444 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1445 return 0; 1446 } 1447 if (Decl *NS = R) { 1448 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1449 // C++ [namespace.udir]p1: 1450 // A using-directive specifies that the names in the nominated 1451 // namespace can be used in the scope in which the 1452 // using-directive appears after the using-directive. During 1453 // unqualified name lookup (3.4.1), the names appear as if they 1454 // were declared in the nearest enclosing namespace which 1455 // contains both the using-directive and the nominated 1456 // namespace. [Note: in this context, “contains” means “contains 1457 // directly or indirectly”. ] 1458 1459 // Find enclosing context containing both using-directive and 1460 // nominated namespace. 1461 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1462 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1463 CommonAncestor = CommonAncestor->getParent(); 1464 1465 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, 1466 NamespcLoc, IdentLoc, 1467 cast<NamespaceDecl>(NS), 1468 CommonAncestor); 1469 PushUsingDirective(S, UDir); 1470 } else { 1471 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1472 } 1473 1474 // FIXME: We ignore attributes for now. 1475 delete AttrList; 1476 return UDir; 1477} 1478 1479void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1480 // If scope has associated entity, then using directive is at namespace 1481 // or translation unit scope. We add UsingDirectiveDecls, into 1482 // it's lookup structure. 1483 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1484 Ctx->addDecl(UDir); 1485 else 1486 // Otherwise it is block-sope. using-directives will affect lookup 1487 // only to the end of scope. 1488 S->PushUsingDirective(UDir); 1489} 1490 1491/// AddCXXDirectInitializerToDecl - This action is called immediately after 1492/// ActOnDeclarator, when a C++ direct initializer is present. 1493/// e.g: "int x(1);" 1494void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1495 ExprTy **ExprTys, unsigned NumExprs, 1496 SourceLocation *CommaLocs, 1497 SourceLocation RParenLoc) { 1498 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1499 Decl *RealDecl = static_cast<Decl *>(Dcl); 1500 1501 // If there is no declaration, there was an error parsing it. Just ignore 1502 // the initializer. 1503 if (RealDecl == 0) { 1504 for (unsigned i = 0; i != NumExprs; ++i) 1505 delete static_cast<Expr *>(ExprTys[i]); 1506 return; 1507 } 1508 1509 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1510 if (!VDecl) { 1511 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1512 RealDecl->setInvalidDecl(); 1513 return; 1514 } 1515 1516 // We will treat direct-initialization as a copy-initialization: 1517 // int x(1); -as-> int x = 1; 1518 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1519 // 1520 // Clients that want to distinguish between the two forms, can check for 1521 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1522 // A major benefit is that clients that don't particularly care about which 1523 // exactly form was it (like the CodeGen) can handle both cases without 1524 // special case code. 1525 1526 // C++ 8.5p11: 1527 // The form of initialization (using parentheses or '=') is generally 1528 // insignificant, but does matter when the entity being initialized has a 1529 // class type. 1530 QualType DeclInitType = VDecl->getType(); 1531 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1532 DeclInitType = Array->getElementType(); 1533 1534 if (VDecl->getType()->isRecordType()) { 1535 CXXConstructorDecl *Constructor 1536 = PerformInitializationByConstructor(DeclInitType, 1537 (Expr **)ExprTys, NumExprs, 1538 VDecl->getLocation(), 1539 SourceRange(VDecl->getLocation(), 1540 RParenLoc), 1541 VDecl->getDeclName(), 1542 IK_Direct); 1543 if (!Constructor) { 1544 RealDecl->setInvalidDecl(); 1545 } 1546 1547 // Let clients know that initialization was done with a direct 1548 // initializer. 1549 VDecl->setCXXDirectInitializer(true); 1550 1551 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1552 // the initializer. 1553 return; 1554 } 1555 1556 if (NumExprs > 1) { 1557 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1558 << SourceRange(VDecl->getLocation(), RParenLoc); 1559 RealDecl->setInvalidDecl(); 1560 return; 1561 } 1562 1563 // Let clients know that initialization was done with a direct initializer. 1564 VDecl->setCXXDirectInitializer(true); 1565 1566 assert(NumExprs == 1 && "Expected 1 expression"); 1567 // Set the init expression, handles conversions. 1568 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1569} 1570 1571/// PerformInitializationByConstructor - Perform initialization by 1572/// constructor (C++ [dcl.init]p14), which may occur as part of 1573/// direct-initialization or copy-initialization. We are initializing 1574/// an object of type @p ClassType with the given arguments @p 1575/// Args. @p Loc is the location in the source code where the 1576/// initializer occurs (e.g., a declaration, member initializer, 1577/// functional cast, etc.) while @p Range covers the whole 1578/// initialization. @p InitEntity is the entity being initialized, 1579/// which may by the name of a declaration or a type. @p Kind is the 1580/// kind of initialization we're performing, which affects whether 1581/// explicit constructors will be considered. When successful, returns 1582/// the constructor that will be used to perform the initialization; 1583/// when the initialization fails, emits a diagnostic and returns 1584/// null. 1585CXXConstructorDecl * 1586Sema::PerformInitializationByConstructor(QualType ClassType, 1587 Expr **Args, unsigned NumArgs, 1588 SourceLocation Loc, SourceRange Range, 1589 DeclarationName InitEntity, 1590 InitializationKind Kind) { 1591 const RecordType *ClassRec = ClassType->getAsRecordType(); 1592 assert(ClassRec && "Can only initialize a class type here"); 1593 1594 // C++ [dcl.init]p14: 1595 // 1596 // If the initialization is direct-initialization, or if it is 1597 // copy-initialization where the cv-unqualified version of the 1598 // source type is the same class as, or a derived class of, the 1599 // class of the destination, constructors are considered. The 1600 // applicable constructors are enumerated (13.3.1.3), and the 1601 // best one is chosen through overload resolution (13.3). The 1602 // constructor so selected is called to initialize the object, 1603 // with the initializer expression(s) as its argument(s). If no 1604 // constructor applies, or the overload resolution is ambiguous, 1605 // the initialization is ill-formed. 1606 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1607 OverloadCandidateSet CandidateSet; 1608 1609 // Add constructors to the overload set. 1610 DeclarationName ConstructorName 1611 = Context.DeclarationNames.getCXXConstructorName( 1612 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1613 DeclContext::lookup_const_iterator Con, ConEnd; 1614 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1615 Con != ConEnd; ++Con) { 1616 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1617 if ((Kind == IK_Direct) || 1618 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1619 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1620 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1621 } 1622 1623 // FIXME: When we decide not to synthesize the implicitly-declared 1624 // constructors, we'll need to make them appear here. 1625 1626 OverloadCandidateSet::iterator Best; 1627 switch (BestViableFunction(CandidateSet, Best)) { 1628 case OR_Success: 1629 // We found a constructor. Return it. 1630 return cast<CXXConstructorDecl>(Best->Function); 1631 1632 case OR_No_Viable_Function: 1633 if (InitEntity) 1634 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1635 << InitEntity << (unsigned)CandidateSet.size() << Range; 1636 else 1637 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1638 << ClassType << (unsigned)CandidateSet.size() << Range; 1639 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1640 return 0; 1641 1642 case OR_Ambiguous: 1643 if (InitEntity) 1644 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1645 else 1646 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 1647 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1648 return 0; 1649 } 1650 1651 return 0; 1652} 1653 1654/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1655/// determine whether they are reference-related, 1656/// reference-compatible, reference-compatible with added 1657/// qualification, or incompatible, for use in C++ initialization by 1658/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1659/// type, and the first type (T1) is the pointee type of the reference 1660/// type being initialized. 1661Sema::ReferenceCompareResult 1662Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1663 bool& DerivedToBase) { 1664 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1665 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1666 1667 T1 = Context.getCanonicalType(T1); 1668 T2 = Context.getCanonicalType(T2); 1669 QualType UnqualT1 = T1.getUnqualifiedType(); 1670 QualType UnqualT2 = T2.getUnqualifiedType(); 1671 1672 // C++ [dcl.init.ref]p4: 1673 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1674 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1675 // T1 is a base class of T2. 1676 if (UnqualT1 == UnqualT2) 1677 DerivedToBase = false; 1678 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1679 DerivedToBase = true; 1680 else 1681 return Ref_Incompatible; 1682 1683 // At this point, we know that T1 and T2 are reference-related (at 1684 // least). 1685 1686 // C++ [dcl.init.ref]p4: 1687 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1688 // reference-related to T2 and cv1 is the same cv-qualification 1689 // as, or greater cv-qualification than, cv2. For purposes of 1690 // overload resolution, cases for which cv1 is greater 1691 // cv-qualification than cv2 are identified as 1692 // reference-compatible with added qualification (see 13.3.3.2). 1693 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1694 return Ref_Compatible; 1695 else if (T1.isMoreQualifiedThan(T2)) 1696 return Ref_Compatible_With_Added_Qualification; 1697 else 1698 return Ref_Related; 1699} 1700 1701/// CheckReferenceInit - Check the initialization of a reference 1702/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1703/// the initializer (either a simple initializer or an initializer 1704/// list), and DeclType is the type of the declaration. When ICS is 1705/// non-null, this routine will compute the implicit conversion 1706/// sequence according to C++ [over.ics.ref] and will not produce any 1707/// diagnostics; when ICS is null, it will emit diagnostics when any 1708/// errors are found. Either way, a return value of true indicates 1709/// that there was a failure, a return value of false indicates that 1710/// the reference initialization succeeded. 1711/// 1712/// When @p SuppressUserConversions, user-defined conversions are 1713/// suppressed. 1714/// When @p AllowExplicit, we also permit explicit user-defined 1715/// conversion functions. 1716bool 1717Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1718 ImplicitConversionSequence *ICS, 1719 bool SuppressUserConversions, 1720 bool AllowExplicit) { 1721 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1722 1723 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1724 QualType T2 = Init->getType(); 1725 1726 // If the initializer is the address of an overloaded function, try 1727 // to resolve the overloaded function. If all goes well, T2 is the 1728 // type of the resulting function. 1729 if (T2->isOverloadType()) { 1730 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1731 ICS != 0); 1732 if (Fn) { 1733 // Since we're performing this reference-initialization for 1734 // real, update the initializer with the resulting function. 1735 if (!ICS) 1736 FixOverloadedFunctionReference(Init, Fn); 1737 1738 T2 = Fn->getType(); 1739 } 1740 } 1741 1742 // Compute some basic properties of the types and the initializer. 1743 bool DerivedToBase = false; 1744 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1745 ReferenceCompareResult RefRelationship 1746 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1747 1748 // Most paths end in a failed conversion. 1749 if (ICS) 1750 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1751 1752 // C++ [dcl.init.ref]p5: 1753 // A reference to type “cv1 T1” is initialized by an expression 1754 // of type “cv2 T2” as follows: 1755 1756 // -- If the initializer expression 1757 1758 bool BindsDirectly = false; 1759 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1760 // reference-compatible with “cv2 T2,” or 1761 // 1762 // Note that the bit-field check is skipped if we are just computing 1763 // the implicit conversion sequence (C++ [over.best.ics]p2). 1764 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1765 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1766 BindsDirectly = true; 1767 1768 if (ICS) { 1769 // C++ [over.ics.ref]p1: 1770 // When a parameter of reference type binds directly (8.5.3) 1771 // to an argument expression, the implicit conversion sequence 1772 // is the identity conversion, unless the argument expression 1773 // has a type that is a derived class of the parameter type, 1774 // in which case the implicit conversion sequence is a 1775 // derived-to-base Conversion (13.3.3.1). 1776 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1777 ICS->Standard.First = ICK_Identity; 1778 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1779 ICS->Standard.Third = ICK_Identity; 1780 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1781 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1782 ICS->Standard.ReferenceBinding = true; 1783 ICS->Standard.DirectBinding = true; 1784 1785 // Nothing more to do: the inaccessibility/ambiguity check for 1786 // derived-to-base conversions is suppressed when we're 1787 // computing the implicit conversion sequence (C++ 1788 // [over.best.ics]p2). 1789 return false; 1790 } else { 1791 // Perform the conversion. 1792 // FIXME: Binding to a subobject of the lvalue is going to require 1793 // more AST annotation than this. 1794 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1795 } 1796 } 1797 1798 // -- has a class type (i.e., T2 is a class type) and can be 1799 // implicitly converted to an lvalue of type “cv3 T3,” 1800 // where “cv1 T1” is reference-compatible with “cv3 T3” 1801 // 92) (this conversion is selected by enumerating the 1802 // applicable conversion functions (13.3.1.6) and choosing 1803 // the best one through overload resolution (13.3)), 1804 if (!SuppressUserConversions && T2->isRecordType()) { 1805 // FIXME: Look for conversions in base classes! 1806 CXXRecordDecl *T2RecordDecl 1807 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1808 1809 OverloadCandidateSet CandidateSet; 1810 OverloadedFunctionDecl *Conversions 1811 = T2RecordDecl->getConversionFunctions(); 1812 for (OverloadedFunctionDecl::function_iterator Func 1813 = Conversions->function_begin(); 1814 Func != Conversions->function_end(); ++Func) { 1815 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1816 1817 // If the conversion function doesn't return a reference type, 1818 // it can't be considered for this conversion. 1819 // FIXME: This will change when we support rvalue references. 1820 if (Conv->getConversionType()->isReferenceType() && 1821 (AllowExplicit || !Conv->isExplicit())) 1822 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1823 } 1824 1825 OverloadCandidateSet::iterator Best; 1826 switch (BestViableFunction(CandidateSet, Best)) { 1827 case OR_Success: 1828 // This is a direct binding. 1829 BindsDirectly = true; 1830 1831 if (ICS) { 1832 // C++ [over.ics.ref]p1: 1833 // 1834 // [...] If the parameter binds directly to the result of 1835 // applying a conversion function to the argument 1836 // expression, the implicit conversion sequence is a 1837 // user-defined conversion sequence (13.3.3.1.2), with the 1838 // second standard conversion sequence either an identity 1839 // conversion or, if the conversion function returns an 1840 // entity of a type that is a derived class of the parameter 1841 // type, a derived-to-base Conversion. 1842 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1843 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1844 ICS->UserDefined.After = Best->FinalConversion; 1845 ICS->UserDefined.ConversionFunction = Best->Function; 1846 assert(ICS->UserDefined.After.ReferenceBinding && 1847 ICS->UserDefined.After.DirectBinding && 1848 "Expected a direct reference binding!"); 1849 return false; 1850 } else { 1851 // Perform the conversion. 1852 // FIXME: Binding to a subobject of the lvalue is going to require 1853 // more AST annotation than this. 1854 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1855 } 1856 break; 1857 1858 case OR_Ambiguous: 1859 assert(false && "Ambiguous reference binding conversions not implemented."); 1860 return true; 1861 1862 case OR_No_Viable_Function: 1863 // There was no suitable conversion; continue with other checks. 1864 break; 1865 } 1866 } 1867 1868 if (BindsDirectly) { 1869 // C++ [dcl.init.ref]p4: 1870 // [...] In all cases where the reference-related or 1871 // reference-compatible relationship of two types is used to 1872 // establish the validity of a reference binding, and T1 is a 1873 // base class of T2, a program that necessitates such a binding 1874 // is ill-formed if T1 is an inaccessible (clause 11) or 1875 // ambiguous (10.2) base class of T2. 1876 // 1877 // Note that we only check this condition when we're allowed to 1878 // complain about errors, because we should not be checking for 1879 // ambiguity (or inaccessibility) unless the reference binding 1880 // actually happens. 1881 if (DerivedToBase) 1882 return CheckDerivedToBaseConversion(T2, T1, 1883 Init->getSourceRange().getBegin(), 1884 Init->getSourceRange()); 1885 else 1886 return false; 1887 } 1888 1889 // -- Otherwise, the reference shall be to a non-volatile const 1890 // type (i.e., cv1 shall be const). 1891 if (T1.getCVRQualifiers() != QualType::Const) { 1892 if (!ICS) 1893 Diag(Init->getSourceRange().getBegin(), 1894 diag::err_not_reference_to_const_init) 1895 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1896 << T2 << Init->getSourceRange(); 1897 return true; 1898 } 1899 1900 // -- If the initializer expression is an rvalue, with T2 a 1901 // class type, and “cv1 T1” is reference-compatible with 1902 // “cv2 T2,” the reference is bound in one of the 1903 // following ways (the choice is implementation-defined): 1904 // 1905 // -- The reference is bound to the object represented by 1906 // the rvalue (see 3.10) or to a sub-object within that 1907 // object. 1908 // 1909 // -- A temporary of type “cv1 T2” [sic] is created, and 1910 // a constructor is called to copy the entire rvalue 1911 // object into the temporary. The reference is bound to 1912 // the temporary or to a sub-object within the 1913 // temporary. 1914 // 1915 // The constructor that would be used to make the copy 1916 // shall be callable whether or not the copy is actually 1917 // done. 1918 // 1919 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1920 // freedom, so we will always take the first option and never build 1921 // a temporary in this case. FIXME: We will, however, have to check 1922 // for the presence of a copy constructor in C++98/03 mode. 1923 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1924 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1925 if (ICS) { 1926 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1927 ICS->Standard.First = ICK_Identity; 1928 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1929 ICS->Standard.Third = ICK_Identity; 1930 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1931 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1932 ICS->Standard.ReferenceBinding = true; 1933 ICS->Standard.DirectBinding = false; 1934 } else { 1935 // FIXME: Binding to a subobject of the rvalue is going to require 1936 // more AST annotation than this. 1937 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1938 } 1939 return false; 1940 } 1941 1942 // -- Otherwise, a temporary of type “cv1 T1” is created and 1943 // initialized from the initializer expression using the 1944 // rules for a non-reference copy initialization (8.5). The 1945 // reference is then bound to the temporary. If T1 is 1946 // reference-related to T2, cv1 must be the same 1947 // cv-qualification as, or greater cv-qualification than, 1948 // cv2; otherwise, the program is ill-formed. 1949 if (RefRelationship == Ref_Related) { 1950 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1951 // we would be reference-compatible or reference-compatible with 1952 // added qualification. But that wasn't the case, so the reference 1953 // initialization fails. 1954 if (!ICS) 1955 Diag(Init->getSourceRange().getBegin(), 1956 diag::err_reference_init_drops_quals) 1957 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1958 << T2 << Init->getSourceRange(); 1959 return true; 1960 } 1961 1962 // If at least one of the types is a class type, the types are not 1963 // related, and we aren't allowed any user conversions, the 1964 // reference binding fails. This case is important for breaking 1965 // recursion, since TryImplicitConversion below will attempt to 1966 // create a temporary through the use of a copy constructor. 1967 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 1968 (T1->isRecordType() || T2->isRecordType())) { 1969 if (!ICS) 1970 Diag(Init->getSourceRange().getBegin(), 1971 diag::err_typecheck_convert_incompatible) 1972 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 1973 return true; 1974 } 1975 1976 // Actually try to convert the initializer to T1. 1977 if (ICS) { 1978 /// C++ [over.ics.ref]p2: 1979 /// 1980 /// When a parameter of reference type is not bound directly to 1981 /// an argument expression, the conversion sequence is the one 1982 /// required to convert the argument expression to the 1983 /// underlying type of the reference according to 1984 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 1985 /// to copy-initializing a temporary of the underlying type with 1986 /// the argument expression. Any difference in top-level 1987 /// cv-qualification is subsumed by the initialization itself 1988 /// and does not constitute a conversion. 1989 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 1990 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 1991 } else { 1992 return PerformImplicitConversion(Init, T1, "initializing"); 1993 } 1994} 1995 1996/// CheckOverloadedOperatorDeclaration - Check whether the declaration 1997/// of this overloaded operator is well-formed. If so, returns false; 1998/// otherwise, emits appropriate diagnostics and returns true. 1999bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2000 assert(FnDecl && FnDecl->isOverloadedOperator() && 2001 "Expected an overloaded operator declaration"); 2002 2003 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2004 2005 // C++ [over.oper]p5: 2006 // The allocation and deallocation functions, operator new, 2007 // operator new[], operator delete and operator delete[], are 2008 // described completely in 3.7.3. The attributes and restrictions 2009 // found in the rest of this subclause do not apply to them unless 2010 // explicitly stated in 3.7.3. 2011 // FIXME: Write a separate routine for checking this. For now, just 2012 // allow it. 2013 if (Op == OO_New || Op == OO_Array_New || 2014 Op == OO_Delete || Op == OO_Array_Delete) 2015 return false; 2016 2017 // C++ [over.oper]p6: 2018 // An operator function shall either be a non-static member 2019 // function or be a non-member function and have at least one 2020 // parameter whose type is a class, a reference to a class, an 2021 // enumeration, or a reference to an enumeration. 2022 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2023 if (MethodDecl->isStatic()) 2024 return Diag(FnDecl->getLocation(), 2025 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2026 } else { 2027 bool ClassOrEnumParam = false; 2028 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2029 ParamEnd = FnDecl->param_end(); 2030 Param != ParamEnd; ++Param) { 2031 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2032 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2033 ClassOrEnumParam = true; 2034 break; 2035 } 2036 } 2037 2038 if (!ClassOrEnumParam) 2039 return Diag(FnDecl->getLocation(), 2040 diag::err_operator_overload_needs_class_or_enum) 2041 << FnDecl->getDeclName(); 2042 } 2043 2044 // C++ [over.oper]p8: 2045 // An operator function cannot have default arguments (8.3.6), 2046 // except where explicitly stated below. 2047 // 2048 // Only the function-call operator allows default arguments 2049 // (C++ [over.call]p1). 2050 if (Op != OO_Call) { 2051 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2052 Param != FnDecl->param_end(); ++Param) { 2053 if ((*Param)->hasUnparsedDefaultArg()) 2054 return Diag((*Param)->getLocation(), 2055 diag::err_operator_overload_default_arg) 2056 << FnDecl->getDeclName(); 2057 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2058 return Diag((*Param)->getLocation(), 2059 diag::err_operator_overload_default_arg) 2060 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2061 } 2062 } 2063 2064 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2065 { false, false, false } 2066#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2067 , { Unary, Binary, MemberOnly } 2068#include "clang/Basic/OperatorKinds.def" 2069 }; 2070 2071 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2072 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2073 bool MustBeMemberOperator = OperatorUses[Op][2]; 2074 2075 // C++ [over.oper]p8: 2076 // [...] Operator functions cannot have more or fewer parameters 2077 // than the number required for the corresponding operator, as 2078 // described in the rest of this subclause. 2079 unsigned NumParams = FnDecl->getNumParams() 2080 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2081 if (Op != OO_Call && 2082 ((NumParams == 1 && !CanBeUnaryOperator) || 2083 (NumParams == 2 && !CanBeBinaryOperator) || 2084 (NumParams < 1) || (NumParams > 2))) { 2085 // We have the wrong number of parameters. 2086 unsigned ErrorKind; 2087 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2088 ErrorKind = 2; // 2 -> unary or binary. 2089 } else if (CanBeUnaryOperator) { 2090 ErrorKind = 0; // 0 -> unary 2091 } else { 2092 assert(CanBeBinaryOperator && 2093 "All non-call overloaded operators are unary or binary!"); 2094 ErrorKind = 1; // 1 -> binary 2095 } 2096 2097 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2098 << FnDecl->getDeclName() << NumParams << ErrorKind; 2099 } 2100 2101 // Overloaded operators other than operator() cannot be variadic. 2102 if (Op != OO_Call && 2103 FnDecl->getType()->getAsFunctionTypeProto()->isVariadic()) { 2104 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2105 << FnDecl->getDeclName(); 2106 } 2107 2108 // Some operators must be non-static member functions. 2109 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2110 return Diag(FnDecl->getLocation(), 2111 diag::err_operator_overload_must_be_member) 2112 << FnDecl->getDeclName(); 2113 } 2114 2115 // C++ [over.inc]p1: 2116 // The user-defined function called operator++ implements the 2117 // prefix and postfix ++ operator. If this function is a member 2118 // function with no parameters, or a non-member function with one 2119 // parameter of class or enumeration type, it defines the prefix 2120 // increment operator ++ for objects of that type. If the function 2121 // is a member function with one parameter (which shall be of type 2122 // int) or a non-member function with two parameters (the second 2123 // of which shall be of type int), it defines the postfix 2124 // increment operator ++ for objects of that type. 2125 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2126 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2127 bool ParamIsInt = false; 2128 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2129 ParamIsInt = BT->getKind() == BuiltinType::Int; 2130 2131 if (!ParamIsInt) 2132 return Diag(LastParam->getLocation(), 2133 diag::err_operator_overload_post_incdec_must_be_int) 2134 << LastParam->getType() << (Op == OO_MinusMinus); 2135 } 2136 2137 // Notify the class if it got an assignment operator. 2138 if (Op == OO_Equal) { 2139 // Would have returned earlier otherwise. 2140 assert(isa<CXXMethodDecl>(FnDecl) && 2141 "Overloaded = not member, but not filtered."); 2142 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2143 Method->getParent()->addedAssignmentOperator(Context, Method); 2144 } 2145 2146 return false; 2147} 2148 2149/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2150/// linkage specification, including the language and (if present) 2151/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2152/// the location of the language string literal, which is provided 2153/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2154/// the '{' brace. Otherwise, this linkage specification does not 2155/// have any braces. 2156Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2157 SourceLocation ExternLoc, 2158 SourceLocation LangLoc, 2159 const char *Lang, 2160 unsigned StrSize, 2161 SourceLocation LBraceLoc) { 2162 LinkageSpecDecl::LanguageIDs Language; 2163 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2164 Language = LinkageSpecDecl::lang_c; 2165 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2166 Language = LinkageSpecDecl::lang_cxx; 2167 else { 2168 Diag(LangLoc, diag::err_bad_language); 2169 return 0; 2170 } 2171 2172 // FIXME: Add all the various semantics of linkage specifications 2173 2174 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2175 LangLoc, Language, 2176 LBraceLoc.isValid()); 2177 CurContext->addDecl(D); 2178 PushDeclContext(S, D); 2179 return D; 2180} 2181 2182/// ActOnFinishLinkageSpecification - Completely the definition of 2183/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2184/// valid, it's the position of the closing '}' brace in a linkage 2185/// specification that uses braces. 2186Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2187 DeclTy *LinkageSpec, 2188 SourceLocation RBraceLoc) { 2189 if (LinkageSpec) 2190 PopDeclContext(); 2191 return LinkageSpec; 2192} 2193 2194/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2195/// handler. 2196Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2197{ 2198 QualType ExDeclType = GetTypeForDeclarator(D, S); 2199 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2200 2201 bool Invalid = false; 2202 2203 // Arrays and functions decay. 2204 if (ExDeclType->isArrayType()) 2205 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2206 else if (ExDeclType->isFunctionType()) 2207 ExDeclType = Context.getPointerType(ExDeclType); 2208 2209 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2210 // The exception-declaration shall not denote a pointer or reference to an 2211 // incomplete type, other than [cv] void*. 2212 QualType BaseType = ExDeclType; 2213 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2214 unsigned DK = diag::err_catch_incomplete; 2215 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2216 BaseType = Ptr->getPointeeType(); 2217 Mode = 1; 2218 DK = diag::err_catch_incomplete_ptr; 2219 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2220 BaseType = Ref->getPointeeType(); 2221 Mode = 2; 2222 DK = diag::err_catch_incomplete_ref; 2223 } 2224 if ((Mode == 0 || !BaseType->isVoidType()) && 2225 DiagnoseIncompleteType(Begin, BaseType, DK)) 2226 Invalid = true; 2227 2228 // FIXME: Need to test for ability to copy-construct and destroy the 2229 // exception variable. 2230 // FIXME: Need to check for abstract classes. 2231 2232 IdentifierInfo *II = D.getIdentifier(); 2233 if (Decl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2234 // The scope should be freshly made just for us. There is just no way 2235 // it contains any previous declaration. 2236 assert(!S->isDeclScope(PrevDecl)); 2237 if (PrevDecl->isTemplateParameter()) { 2238 // Maybe we will complain about the shadowed template parameter. 2239 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2240 2241 } 2242 } 2243 2244 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2245 II, ExDeclType, VarDecl::None, Begin); 2246 if (D.getInvalidType() || Invalid) 2247 ExDecl->setInvalidDecl(); 2248 2249 if (D.getCXXScopeSpec().isSet()) { 2250 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2251 << D.getCXXScopeSpec().getRange(); 2252 ExDecl->setInvalidDecl(); 2253 } 2254 2255 // Add the exception declaration into this scope. 2256 S->AddDecl(ExDecl); 2257 if (II) 2258 IdResolver.AddDecl(ExDecl); 2259 2260 ProcessDeclAttributes(ExDecl, D); 2261 return ExDecl; 2262} 2263