SemaDeclCXX.cpp revision 46fe06e7544e7cbe79b893fb028c3ecd45feec00
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/Basic/Diagnostic.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclTy *param, SourceLocation EqualLoc, 109 ExprTy *defarg) { 110 ParmVarDecl *Param = (ParmVarDecl *)param; 111 llvm::OwningPtr<Expr> DefaultArg((Expr *)defarg); 112 QualType ParamType = Param->getType(); 113 114 // Default arguments are only permitted in C++ 115 if (!getLangOptions().CPlusPlus) { 116 Diag(EqualLoc, diag::err_param_default_argument) 117 << DefaultArg->getSourceRange(); 118 Param->setInvalidDecl(); 119 return; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 Expr *DefaultArgPtr = DefaultArg.get(); 129 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 130 EqualLoc, 131 Param->getDeclName(), 132 /*DirectInit=*/false); 133 if (DefaultArgPtr != DefaultArg.get()) { 134 DefaultArg.take(); 135 DefaultArg.reset(DefaultArgPtr); 136 } 137 if (DefaultInitFailed) { 138 return; 139 } 140 141 // Check that the default argument is well-formed 142 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 143 if (DefaultArgChecker.Visit(DefaultArg.get())) { 144 Param->setInvalidDecl(); 145 return; 146 } 147 148 // Okay: add the default argument to the parameter 149 Param->setDefaultArg(DefaultArg.take()); 150} 151 152/// ActOnParamUnparsedDefaultArgument - We've seen a default 153/// argument for a function parameter, but we can't parse it yet 154/// because we're inside a class definition. Note that this default 155/// argument will be parsed later. 156void Sema::ActOnParamUnparsedDefaultArgument(DeclTy *param, 157 SourceLocation EqualLoc) { 158 ParmVarDecl *Param = (ParmVarDecl*)param; 159 if (Param) 160 Param->setUnparsedDefaultArg(); 161} 162 163/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 164/// the default argument for the parameter param failed. 165void Sema::ActOnParamDefaultArgumentError(DeclTy *param) { 166 ((ParmVarDecl*)param)->setInvalidDecl(); 167} 168 169/// CheckExtraCXXDefaultArguments - Check for any extra default 170/// arguments in the declarator, which is not a function declaration 171/// or definition and therefore is not permitted to have default 172/// arguments. This routine should be invoked for every declarator 173/// that is not a function declaration or definition. 174void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 175 // C++ [dcl.fct.default]p3 176 // A default argument expression shall be specified only in the 177 // parameter-declaration-clause of a function declaration or in a 178 // template-parameter (14.1). It shall not be specified for a 179 // parameter pack. If it is specified in a 180 // parameter-declaration-clause, it shall not occur within a 181 // declarator or abstract-declarator of a parameter-declaration. 182 for (unsigned i = 0; i < D.getNumTypeObjects(); ++i) { 183 DeclaratorChunk &chunk = D.getTypeObject(i); 184 if (chunk.Kind == DeclaratorChunk::Function) { 185 for (unsigned argIdx = 0; argIdx < chunk.Fun.NumArgs; ++argIdx) { 186 ParmVarDecl *Param = (ParmVarDecl *)chunk.Fun.ArgInfo[argIdx].Param; 187 if (Param->hasUnparsedDefaultArg()) { 188 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 189 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 190 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 191 delete Toks; 192 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 193 } else if (Param->getDefaultArg()) { 194 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 195 << Param->getDefaultArg()->getSourceRange(); 196 Param->setDefaultArg(0); 197 } 198 } 199 } 200 } 201} 202 203// MergeCXXFunctionDecl - Merge two declarations of the same C++ 204// function, once we already know that they have the same 205// type. Subroutine of MergeFunctionDecl. 206FunctionDecl * 207Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 208 // C++ [dcl.fct.default]p4: 209 // 210 // For non-template functions, default arguments can be added in 211 // later declarations of a function in the same 212 // scope. Declarations in different scopes have completely 213 // distinct sets of default arguments. That is, declarations in 214 // inner scopes do not acquire default arguments from 215 // declarations in outer scopes, and vice versa. In a given 216 // function declaration, all parameters subsequent to a 217 // parameter with a default argument shall have default 218 // arguments supplied in this or previous declarations. A 219 // default argument shall not be redefined by a later 220 // declaration (not even to the same value). 221 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 222 ParmVarDecl *OldParam = Old->getParamDecl(p); 223 ParmVarDecl *NewParam = New->getParamDecl(p); 224 225 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 226 Diag(NewParam->getLocation(), 227 diag::err_param_default_argument_redefinition) 228 << NewParam->getDefaultArg()->getSourceRange(); 229 Diag(OldParam->getLocation(), diag::note_previous_definition); 230 } else if (OldParam->getDefaultArg()) { 231 // Merge the old default argument into the new parameter 232 NewParam->setDefaultArg(OldParam->getDefaultArg()); 233 } 234 } 235 236 return New; 237} 238 239/// CheckCXXDefaultArguments - Verify that the default arguments for a 240/// function declaration are well-formed according to C++ 241/// [dcl.fct.default]. 242void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 243 unsigned NumParams = FD->getNumParams(); 244 unsigned p; 245 246 // Find first parameter with a default argument 247 for (p = 0; p < NumParams; ++p) { 248 ParmVarDecl *Param = FD->getParamDecl(p); 249 if (Param->getDefaultArg()) 250 break; 251 } 252 253 // C++ [dcl.fct.default]p4: 254 // In a given function declaration, all parameters 255 // subsequent to a parameter with a default argument shall 256 // have default arguments supplied in this or previous 257 // declarations. A default argument shall not be redefined 258 // by a later declaration (not even to the same value). 259 unsigned LastMissingDefaultArg = 0; 260 for(; p < NumParams; ++p) { 261 ParmVarDecl *Param = FD->getParamDecl(p); 262 if (!Param->getDefaultArg()) { 263 if (Param->isInvalidDecl()) 264 /* We already complained about this parameter. */; 265 else if (Param->getIdentifier()) 266 Diag(Param->getLocation(), 267 diag::err_param_default_argument_missing_name) 268 << Param->getIdentifier(); 269 else 270 Diag(Param->getLocation(), 271 diag::err_param_default_argument_missing); 272 273 LastMissingDefaultArg = p; 274 } 275 } 276 277 if (LastMissingDefaultArg > 0) { 278 // Some default arguments were missing. Clear out all of the 279 // default arguments up to (and including) the last missing 280 // default argument, so that we leave the function parameters 281 // in a semantically valid state. 282 for (p = 0; p <= LastMissingDefaultArg; ++p) { 283 ParmVarDecl *Param = FD->getParamDecl(p); 284 if (Param->getDefaultArg()) { 285 if (!Param->hasUnparsedDefaultArg()) 286 Param->getDefaultArg()->Destroy(Context); 287 Param->setDefaultArg(0); 288 } 289 } 290 } 291} 292 293/// isCurrentClassName - Determine whether the identifier II is the 294/// name of the class type currently being defined. In the case of 295/// nested classes, this will only return true if II is the name of 296/// the innermost class. 297bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 298 const CXXScopeSpec *SS) { 299 CXXRecordDecl *CurDecl; 300 if (SS) { 301 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 302 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 303 } else 304 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 305 306 if (CurDecl) 307 return &II == CurDecl->getIdentifier(); 308 else 309 return false; 310} 311 312/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 313/// one entry in the base class list of a class specifier, for 314/// example: 315/// class foo : public bar, virtual private baz { 316/// 'public bar' and 'virtual private baz' are each base-specifiers. 317Sema::BaseResult 318Sema::ActOnBaseSpecifier(DeclTy *classdecl, SourceRange SpecifierRange, 319 bool Virtual, AccessSpecifier Access, 320 TypeTy *basetype, SourceLocation BaseLoc) { 321 CXXRecordDecl *Decl = (CXXRecordDecl*)classdecl; 322 QualType BaseType = Context.getTypeDeclType((TypeDecl*)basetype); 323 324 // Base specifiers must be record types. 325 if (!BaseType->isRecordType()) 326 return Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 327 328 // C++ [class.union]p1: 329 // A union shall not be used as a base class. 330 if (BaseType->isUnionType()) 331 return Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 332 333 // C++ [class.union]p1: 334 // A union shall not have base classes. 335 if (Decl->isUnion()) 336 return Diag(Decl->getLocation(), diag::err_base_clause_on_union) 337 << SpecifierRange; 338 339 // C++ [class.derived]p2: 340 // The class-name in a base-specifier shall not be an incompletely 341 // defined class. 342 if (DiagnoseIncompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 343 SpecifierRange)) 344 return true; 345 346 // If the base class is polymorphic, the new one is, too. 347 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 348 assert(BaseDecl && "Record type has no declaration"); 349 BaseDecl = BaseDecl->getDefinition(Context); 350 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 351 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 352 Decl->setPolymorphic(true); 353 354 // C++ [dcl.init.aggr]p1: 355 // An aggregate is [...] a class with [...] no base classes [...]. 356 Decl->setAggregate(false); 357 Decl->setPOD(false); 358 359 // Create the base specifier. 360 return new CXXBaseSpecifier(SpecifierRange, Virtual, 361 BaseType->isClassType(), Access, BaseType); 362} 363 364/// ActOnBaseSpecifiers - Attach the given base specifiers to the 365/// class, after checking whether there are any duplicate base 366/// classes. 367void Sema::ActOnBaseSpecifiers(DeclTy *ClassDecl, BaseTy **Bases, 368 unsigned NumBases) { 369 if (NumBases == 0) 370 return; 371 372 // Used to keep track of which base types we have already seen, so 373 // that we can properly diagnose redundant direct base types. Note 374 // that the key is always the unqualified canonical type of the base 375 // class. 376 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 377 378 // Copy non-redundant base specifiers into permanent storage. 379 CXXBaseSpecifier **BaseSpecs = (CXXBaseSpecifier **)Bases; 380 unsigned NumGoodBases = 0; 381 for (unsigned idx = 0; idx < NumBases; ++idx) { 382 QualType NewBaseType 383 = Context.getCanonicalType(BaseSpecs[idx]->getType()); 384 NewBaseType = NewBaseType.getUnqualifiedType(); 385 386 if (KnownBaseTypes[NewBaseType]) { 387 // C++ [class.mi]p3: 388 // A class shall not be specified as a direct base class of a 389 // derived class more than once. 390 Diag(BaseSpecs[idx]->getSourceRange().getBegin(), 391 diag::err_duplicate_base_class) 392 << KnownBaseTypes[NewBaseType]->getType() 393 << BaseSpecs[idx]->getSourceRange(); 394 395 // Delete the duplicate base class specifier; we're going to 396 // overwrite its pointer later. 397 delete BaseSpecs[idx]; 398 } else { 399 // Okay, add this new base class. 400 KnownBaseTypes[NewBaseType] = BaseSpecs[idx]; 401 BaseSpecs[NumGoodBases++] = BaseSpecs[idx]; 402 } 403 } 404 405 // Attach the remaining base class specifiers to the derived class. 406 CXXRecordDecl *Decl = (CXXRecordDecl*)ClassDecl; 407 Decl->setBases(BaseSpecs, NumGoodBases); 408 409 // Delete the remaining (good) base class specifiers, since their 410 // data has been copied into the CXXRecordDecl. 411 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 412 delete BaseSpecs[idx]; 413} 414 415//===----------------------------------------------------------------------===// 416// C++ class member Handling 417//===----------------------------------------------------------------------===// 418 419/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 420/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 421/// bitfield width if there is one and 'InitExpr' specifies the initializer if 422/// any. 'LastInGroup' is non-null for cases where one declspec has multiple 423/// declarators on it. 424/// 425/// FIXME: The note below is out-of-date. 426/// NOTE: Because of CXXFieldDecl's inability to be chained like ScopedDecls, if 427/// an instance field is declared, a new CXXFieldDecl is created but the method 428/// does *not* return it; it returns LastInGroup instead. The other C++ members 429/// (which are all ScopedDecls) are returned after appending them to 430/// LastInGroup. 431Sema::DeclTy * 432Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 433 ExprTy *BW, ExprTy *InitExpr, 434 DeclTy *LastInGroup) { 435 const DeclSpec &DS = D.getDeclSpec(); 436 DeclarationName Name = GetNameForDeclarator(D); 437 Expr *BitWidth = static_cast<Expr*>(BW); 438 Expr *Init = static_cast<Expr*>(InitExpr); 439 SourceLocation Loc = D.getIdentifierLoc(); 440 441 bool isFunc = D.isFunctionDeclarator(); 442 443 // C++ 9.2p6: A member shall not be declared to have automatic storage 444 // duration (auto, register) or with the extern storage-class-specifier. 445 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 446 // data members and cannot be applied to names declared const or static, 447 // and cannot be applied to reference members. 448 switch (DS.getStorageClassSpec()) { 449 case DeclSpec::SCS_unspecified: 450 case DeclSpec::SCS_typedef: 451 case DeclSpec::SCS_static: 452 // FALL THROUGH. 453 break; 454 case DeclSpec::SCS_mutable: 455 if (isFunc) { 456 if (DS.getStorageClassSpecLoc().isValid()) 457 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 458 else 459 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 460 461 // FIXME: It would be nicer if the keyword was ignored only for this 462 // declarator. Otherwise we could get follow-up errors. 463 D.getMutableDeclSpec().ClearStorageClassSpecs(); 464 } else { 465 QualType T = GetTypeForDeclarator(D, S); 466 diag::kind err = static_cast<diag::kind>(0); 467 if (T->isReferenceType()) 468 err = diag::err_mutable_reference; 469 else if (T.isConstQualified()) 470 err = diag::err_mutable_const; 471 if (err != 0) { 472 if (DS.getStorageClassSpecLoc().isValid()) 473 Diag(DS.getStorageClassSpecLoc(), err); 474 else 475 Diag(DS.getThreadSpecLoc(), err); 476 // FIXME: It would be nicer if the keyword was ignored only for this 477 // declarator. Otherwise we could get follow-up errors. 478 D.getMutableDeclSpec().ClearStorageClassSpecs(); 479 } 480 } 481 break; 482 default: 483 if (DS.getStorageClassSpecLoc().isValid()) 484 Diag(DS.getStorageClassSpecLoc(), 485 diag::err_storageclass_invalid_for_member); 486 else 487 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 488 D.getMutableDeclSpec().ClearStorageClassSpecs(); 489 } 490 491 if (!isFunc && 492 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typedef && 493 D.getNumTypeObjects() == 0) { 494 // Check also for this case: 495 // 496 // typedef int f(); 497 // f a; 498 // 499 Decl *TD = static_cast<Decl *>(DS.getTypeRep()); 500 isFunc = Context.getTypeDeclType(cast<TypeDecl>(TD))->isFunctionType(); 501 } 502 503 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 504 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 505 !isFunc); 506 507 Decl *Member; 508 bool InvalidDecl = false; 509 510 if (isInstField) 511 Member = static_cast<Decl*>(ActOnField(S, cast<CXXRecordDecl>(CurContext), 512 Loc, D, BitWidth)); 513 else 514 Member = static_cast<Decl*>(ActOnDeclarator(S, D, LastInGroup)); 515 516 if (!Member) return LastInGroup; 517 518 assert((Name || isInstField) && "No identifier for non-field ?"); 519 520 // set/getAccess is not part of Decl's interface to avoid bloating it with C++ 521 // specific methods. Use a wrapper class that can be used with all C++ class 522 // member decls. 523 CXXClassMemberWrapper(Member).setAccess(AS); 524 525 // C++ [dcl.init.aggr]p1: 526 // An aggregate is an array or a class (clause 9) with [...] no 527 // private or protected non-static data members (clause 11). 528 // A POD must be an aggregate. 529 if (isInstField && (AS == AS_private || AS == AS_protected)) { 530 CXXRecordDecl *Record = cast<CXXRecordDecl>(CurContext); 531 Record->setAggregate(false); 532 Record->setPOD(false); 533 } 534 535 if (DS.isVirtualSpecified()) { 536 if (!isFunc || DS.getStorageClassSpec() == DeclSpec::SCS_static) { 537 Diag(DS.getVirtualSpecLoc(), diag::err_virtual_non_function); 538 InvalidDecl = true; 539 } else { 540 cast<CXXMethodDecl>(Member)->setVirtual(); 541 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(CurContext); 542 CurClass->setAggregate(false); 543 CurClass->setPOD(false); 544 CurClass->setPolymorphic(true); 545 } 546 } 547 548 // FIXME: The above definition of virtual is not sufficient. A function is 549 // also virtual if it overrides an already virtual function. This is important 550 // to do here because it decides the validity of a pure specifier. 551 552 if (BitWidth) { 553 // C++ 9.6p2: Only when declaring an unnamed bit-field may the 554 // constant-expression be a value equal to zero. 555 // FIXME: Check this. 556 557 if (D.isFunctionDeclarator()) { 558 // FIXME: Emit diagnostic about only constructors taking base initializers 559 // or something similar, when constructor support is in place. 560 Diag(Loc, diag::err_not_bitfield_type) 561 << Name << BitWidth->getSourceRange(); 562 InvalidDecl = true; 563 564 } else if (isInstField) { 565 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 566 if (!cast<FieldDecl>(Member)->getType()->isIntegralType()) { 567 Diag(Loc, diag::err_not_integral_type_bitfield) 568 << Name << BitWidth->getSourceRange(); 569 InvalidDecl = true; 570 } 571 572 } else if (isa<FunctionDecl>(Member)) { 573 // A function typedef ("typedef int f(); f a;"). 574 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 575 Diag(Loc, diag::err_not_integral_type_bitfield) 576 << Name << BitWidth->getSourceRange(); 577 InvalidDecl = true; 578 579 } else if (isa<TypedefDecl>(Member)) { 580 // "cannot declare 'A' to be a bit-field type" 581 Diag(Loc, diag::err_not_bitfield_type) 582 << Name << BitWidth->getSourceRange(); 583 InvalidDecl = true; 584 585 } else { 586 assert(isa<CXXClassVarDecl>(Member) && 587 "Didn't we cover all member kinds?"); 588 // C++ 9.6p3: A bit-field shall not be a static member. 589 // "static member 'A' cannot be a bit-field" 590 Diag(Loc, diag::err_static_not_bitfield) 591 << Name << BitWidth->getSourceRange(); 592 InvalidDecl = true; 593 } 594 } 595 596 if (Init) { 597 // C++ 9.2p4: A member-declarator can contain a constant-initializer only 598 // if it declares a static member of const integral or const enumeration 599 // type. 600 if (CXXClassVarDecl *CVD = dyn_cast<CXXClassVarDecl>(Member)) { 601 // ...static member of... 602 CVD->setInit(Init); 603 // ...const integral or const enumeration type. 604 if (Context.getCanonicalType(CVD->getType()).isConstQualified() && 605 CVD->getType()->isIntegralType()) { 606 // constant-initializer 607 if (CheckForConstantInitializer(Init, CVD->getType())) 608 InvalidDecl = true; 609 610 } else { 611 // not const integral. 612 Diag(Loc, diag::err_member_initialization) 613 << Name << Init->getSourceRange(); 614 InvalidDecl = true; 615 } 616 617 } else { 618 // not static member. perhaps virtual function? 619 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member)) { 620 // With declarators parsed the way they are, the parser cannot 621 // distinguish between a normal initializer and a pure-specifier. 622 // Thus this grotesque test. 623 IntegerLiteral *IL; 624 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 625 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 626 if (MD->isVirtual()) 627 MD->setPure(); 628 else { 629 Diag(Loc, diag::err_non_virtual_pure) 630 << Name << Init->getSourceRange(); 631 InvalidDecl = true; 632 } 633 } else { 634 Diag(Loc, diag::err_member_function_initialization) 635 << Name << Init->getSourceRange(); 636 InvalidDecl = true; 637 } 638 } else { 639 Diag(Loc, diag::err_member_initialization) 640 << Name << Init->getSourceRange(); 641 InvalidDecl = true; 642 } 643 } 644 } 645 646 if (InvalidDecl) 647 Member->setInvalidDecl(); 648 649 if (isInstField) { 650 FieldCollector->Add(cast<FieldDecl>(Member)); 651 return LastInGroup; 652 } 653 return Member; 654} 655 656/// ActOnMemInitializer - Handle a C++ member initializer. 657Sema::MemInitResult 658Sema::ActOnMemInitializer(DeclTy *ConstructorD, 659 Scope *S, 660 IdentifierInfo *MemberOrBase, 661 SourceLocation IdLoc, 662 SourceLocation LParenLoc, 663 ExprTy **Args, unsigned NumArgs, 664 SourceLocation *CommaLocs, 665 SourceLocation RParenLoc) { 666 CXXConstructorDecl *Constructor 667 = dyn_cast<CXXConstructorDecl>((Decl*)ConstructorD); 668 if (!Constructor) { 669 // The user wrote a constructor initializer on a function that is 670 // not a C++ constructor. Ignore the error for now, because we may 671 // have more member initializers coming; we'll diagnose it just 672 // once in ActOnMemInitializers. 673 return true; 674 } 675 676 CXXRecordDecl *ClassDecl = Constructor->getParent(); 677 678 // C++ [class.base.init]p2: 679 // Names in a mem-initializer-id are looked up in the scope of the 680 // constructor’s class and, if not found in that scope, are looked 681 // up in the scope containing the constructor’s 682 // definition. [Note: if the constructor’s class contains a member 683 // with the same name as a direct or virtual base class of the 684 // class, a mem-initializer-id naming the member or base class and 685 // composed of a single identifier refers to the class member. A 686 // mem-initializer-id for the hidden base class may be specified 687 // using a qualified name. ] 688 // Look for a member, first. 689 FieldDecl *Member = 0; 690 DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); 691 if (Result.first != Result.second) 692 Member = dyn_cast<FieldDecl>(*Result.first); 693 694 // FIXME: Handle members of an anonymous union. 695 696 if (Member) { 697 // FIXME: Perform direct initialization of the member. 698 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs); 699 } 700 701 // It didn't name a member, so see if it names a class. 702 TypeTy *BaseTy = isTypeName(*MemberOrBase, S, 0/*SS*/); 703 if (!BaseTy) 704 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 705 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 706 707 QualType BaseType = Context.getTypeDeclType((TypeDecl *)BaseTy); 708 if (!BaseType->isRecordType()) 709 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 710 << BaseType << SourceRange(IdLoc, RParenLoc); 711 712 // C++ [class.base.init]p2: 713 // [...] Unless the mem-initializer-id names a nonstatic data 714 // member of the constructor’s class or a direct or virtual base 715 // of that class, the mem-initializer is ill-formed. A 716 // mem-initializer-list can initialize a base class using any 717 // name that denotes that base class type. 718 719 // First, check for a direct base class. 720 const CXXBaseSpecifier *DirectBaseSpec = 0; 721 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 722 Base != ClassDecl->bases_end(); ++Base) { 723 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 724 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 725 // We found a direct base of this type. That's what we're 726 // initializing. 727 DirectBaseSpec = &*Base; 728 break; 729 } 730 } 731 732 // Check for a virtual base class. 733 // FIXME: We might be able to short-circuit this if we know in 734 // advance that there are no virtual bases. 735 const CXXBaseSpecifier *VirtualBaseSpec = 0; 736 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 737 // We haven't found a base yet; search the class hierarchy for a 738 // virtual base class. 739 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 740 /*DetectVirtual=*/false); 741 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 742 for (BasePaths::paths_iterator Path = Paths.begin(); 743 Path != Paths.end(); ++Path) { 744 if (Path->back().Base->isVirtual()) { 745 VirtualBaseSpec = Path->back().Base; 746 break; 747 } 748 } 749 } 750 } 751 752 // C++ [base.class.init]p2: 753 // If a mem-initializer-id is ambiguous because it designates both 754 // a direct non-virtual base class and an inherited virtual base 755 // class, the mem-initializer is ill-formed. 756 if (DirectBaseSpec && VirtualBaseSpec) 757 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 758 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 759 760 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs); 761} 762 763 764void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 765 DeclTy *TagDecl, 766 SourceLocation LBrac, 767 SourceLocation RBrac) { 768 ActOnFields(S, RLoc, TagDecl, 769 (DeclTy**)FieldCollector->getCurFields(), 770 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 771 AddImplicitlyDeclaredMembersToClass(cast<CXXRecordDecl>((Decl*)TagDecl)); 772} 773 774/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 775/// special functions, such as the default constructor, copy 776/// constructor, or destructor, to the given C++ class (C++ 777/// [special]p1). This routine can only be executed just before the 778/// definition of the class is complete. 779void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 780 QualType ClassType = Context.getTypeDeclType(ClassDecl); 781 ClassType = Context.getCanonicalType(ClassType); 782 783 if (!ClassDecl->hasUserDeclaredConstructor()) { 784 // C++ [class.ctor]p5: 785 // A default constructor for a class X is a constructor of class X 786 // that can be called without an argument. If there is no 787 // user-declared constructor for class X, a default constructor is 788 // implicitly declared. An implicitly-declared default constructor 789 // is an inline public member of its class. 790 DeclarationName Name 791 = Context.DeclarationNames.getCXXConstructorName(ClassType); 792 CXXConstructorDecl *DefaultCon = 793 CXXConstructorDecl::Create(Context, ClassDecl, 794 ClassDecl->getLocation(), Name, 795 Context.getFunctionType(Context.VoidTy, 796 0, 0, false, 0), 797 /*isExplicit=*/false, 798 /*isInline=*/true, 799 /*isImplicitlyDeclared=*/true); 800 DefaultCon->setAccess(AS_public); 801 DefaultCon->setImplicit(); 802 ClassDecl->addDecl(DefaultCon); 803 804 // Notify the class that we've added a constructor. 805 ClassDecl->addedConstructor(Context, DefaultCon); 806 } 807 808 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 809 // C++ [class.copy]p4: 810 // If the class definition does not explicitly declare a copy 811 // constructor, one is declared implicitly. 812 813 // C++ [class.copy]p5: 814 // The implicitly-declared copy constructor for a class X will 815 // have the form 816 // 817 // X::X(const X&) 818 // 819 // if 820 bool HasConstCopyConstructor = true; 821 822 // -- each direct or virtual base class B of X has a copy 823 // constructor whose first parameter is of type const B& or 824 // const volatile B&, and 825 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 826 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 827 const CXXRecordDecl *BaseClassDecl 828 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 829 HasConstCopyConstructor 830 = BaseClassDecl->hasConstCopyConstructor(Context); 831 } 832 833 // -- for all the nonstatic data members of X that are of a 834 // class type M (or array thereof), each such class type 835 // has a copy constructor whose first parameter is of type 836 // const M& or const volatile M&. 837 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 838 HasConstCopyConstructor && Field != ClassDecl->field_end(); ++Field) { 839 QualType FieldType = (*Field)->getType(); 840 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 841 FieldType = Array->getElementType(); 842 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 843 const CXXRecordDecl *FieldClassDecl 844 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 845 HasConstCopyConstructor 846 = FieldClassDecl->hasConstCopyConstructor(Context); 847 } 848 } 849 850 // Otherwise, the implicitly declared copy constructor will have 851 // the form 852 // 853 // X::X(X&) 854 QualType ArgType = ClassType; 855 if (HasConstCopyConstructor) 856 ArgType = ArgType.withConst(); 857 ArgType = Context.getReferenceType(ArgType); 858 859 // An implicitly-declared copy constructor is an inline public 860 // member of its class. 861 DeclarationName Name 862 = Context.DeclarationNames.getCXXConstructorName(ClassType); 863 CXXConstructorDecl *CopyConstructor 864 = CXXConstructorDecl::Create(Context, ClassDecl, 865 ClassDecl->getLocation(), Name, 866 Context.getFunctionType(Context.VoidTy, 867 &ArgType, 1, 868 false, 0), 869 /*isExplicit=*/false, 870 /*isInline=*/true, 871 /*isImplicitlyDeclared=*/true); 872 CopyConstructor->setAccess(AS_public); 873 CopyConstructor->setImplicit(); 874 875 // Add the parameter to the constructor. 876 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 877 ClassDecl->getLocation(), 878 /*IdentifierInfo=*/0, 879 ArgType, VarDecl::None, 0, 0); 880 CopyConstructor->setParams(Context, &FromParam, 1); 881 882 ClassDecl->addedConstructor(Context, CopyConstructor); 883 ClassDecl->addDecl(CopyConstructor); 884 } 885 886 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 887 // Note: The following rules are largely analoguous to the copy 888 // constructor rules. Note that virtual bases are not taken into account 889 // for determining the argument type of the operator. Note also that 890 // operators taking an object instead of a reference are allowed. 891 // 892 // C++ [class.copy]p10: 893 // If the class definition does not explicitly declare a copy 894 // assignment operator, one is declared implicitly. 895 // The implicitly-defined copy assignment operator for a class X 896 // will have the form 897 // 898 // X& X::operator=(const X&) 899 // 900 // if 901 bool HasConstCopyAssignment = true; 902 903 // -- each direct base class B of X has a copy assignment operator 904 // whose parameter is of type const B&, const volatile B& or B, 905 // and 906 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 907 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 908 const CXXRecordDecl *BaseClassDecl 909 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 910 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 911 } 912 913 // -- for all the nonstatic data members of X that are of a class 914 // type M (or array thereof), each such class type has a copy 915 // assignment operator whose parameter is of type const M&, 916 // const volatile M& or M. 917 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 918 HasConstCopyAssignment && Field != ClassDecl->field_end(); ++Field) { 919 QualType FieldType = (*Field)->getType(); 920 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 921 FieldType = Array->getElementType(); 922 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 923 const CXXRecordDecl *FieldClassDecl 924 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 925 HasConstCopyAssignment 926 = FieldClassDecl->hasConstCopyAssignment(Context); 927 } 928 } 929 930 // Otherwise, the implicitly declared copy assignment operator will 931 // have the form 932 // 933 // X& X::operator=(X&) 934 QualType ArgType = ClassType; 935 QualType RetType = Context.getReferenceType(ArgType); 936 if (HasConstCopyAssignment) 937 ArgType = ArgType.withConst(); 938 ArgType = Context.getReferenceType(ArgType); 939 940 // An implicitly-declared copy assignment operator is an inline public 941 // member of its class. 942 DeclarationName Name = 943 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 944 CXXMethodDecl *CopyAssignment = 945 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 946 Context.getFunctionType(RetType, &ArgType, 1, 947 false, 0), 948 /*isStatic=*/false, /*isInline=*/true, 0); 949 CopyAssignment->setAccess(AS_public); 950 CopyAssignment->setImplicit(); 951 952 // Add the parameter to the operator. 953 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 954 ClassDecl->getLocation(), 955 /*IdentifierInfo=*/0, 956 ArgType, VarDecl::None, 0, 0); 957 CopyAssignment->setParams(Context, &FromParam, 1); 958 959 // Don't call addedAssignmentOperator. There is no way to distinguish an 960 // implicit from an explicit assignment operator. 961 ClassDecl->addDecl(CopyAssignment); 962 } 963 964 if (!ClassDecl->hasUserDeclaredDestructor()) { 965 // C++ [class.dtor]p2: 966 // If a class has no user-declared destructor, a destructor is 967 // declared implicitly. An implicitly-declared destructor is an 968 // inline public member of its class. 969 DeclarationName Name 970 = Context.DeclarationNames.getCXXDestructorName(ClassType); 971 CXXDestructorDecl *Destructor 972 = CXXDestructorDecl::Create(Context, ClassDecl, 973 ClassDecl->getLocation(), Name, 974 Context.getFunctionType(Context.VoidTy, 975 0, 0, false, 0), 976 /*isInline=*/true, 977 /*isImplicitlyDeclared=*/true); 978 Destructor->setAccess(AS_public); 979 Destructor->setImplicit(); 980 ClassDecl->addDecl(Destructor); 981 } 982} 983 984/// ActOnStartDelayedCXXMethodDeclaration - We have completed 985/// parsing a top-level (non-nested) C++ class, and we are now 986/// parsing those parts of the given Method declaration that could 987/// not be parsed earlier (C++ [class.mem]p2), such as default 988/// arguments. This action should enter the scope of the given 989/// Method declaration as if we had just parsed the qualified method 990/// name. However, it should not bring the parameters into scope; 991/// that will be performed by ActOnDelayedCXXMethodParameter. 992void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclTy *Method) { 993 CXXScopeSpec SS; 994 SS.setScopeRep(((FunctionDecl*)Method)->getDeclContext()); 995 ActOnCXXEnterDeclaratorScope(S, SS); 996} 997 998/// ActOnDelayedCXXMethodParameter - We've already started a delayed 999/// C++ method declaration. We're (re-)introducing the given 1000/// function parameter into scope for use in parsing later parts of 1001/// the method declaration. For example, we could see an 1002/// ActOnParamDefaultArgument event for this parameter. 1003void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclTy *ParamD) { 1004 ParmVarDecl *Param = (ParmVarDecl*)ParamD; 1005 1006 // If this parameter has an unparsed default argument, clear it out 1007 // to make way for the parsed default argument. 1008 if (Param->hasUnparsedDefaultArg()) 1009 Param->setDefaultArg(0); 1010 1011 S->AddDecl(Param); 1012 if (Param->getDeclName()) 1013 IdResolver.AddDecl(Param); 1014} 1015 1016/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1017/// processing the delayed method declaration for Method. The method 1018/// declaration is now considered finished. There may be a separate 1019/// ActOnStartOfFunctionDef action later (not necessarily 1020/// immediately!) for this method, if it was also defined inside the 1021/// class body. 1022void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclTy *MethodD) { 1023 FunctionDecl *Method = (FunctionDecl*)MethodD; 1024 CXXScopeSpec SS; 1025 SS.setScopeRep(Method->getDeclContext()); 1026 ActOnCXXExitDeclaratorScope(S, SS); 1027 1028 // Now that we have our default arguments, check the constructor 1029 // again. It could produce additional diagnostics or affect whether 1030 // the class has implicitly-declared destructors, among other 1031 // things. 1032 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) { 1033 if (CheckConstructor(Constructor)) 1034 Constructor->setInvalidDecl(); 1035 } 1036 1037 // Check the default arguments, which we may have added. 1038 if (!Method->isInvalidDecl()) 1039 CheckCXXDefaultArguments(Method); 1040} 1041 1042/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1043/// the well-formedness of the constructor declarator @p D with type @p 1044/// R. If there are any errors in the declarator, this routine will 1045/// emit diagnostics and return true. Otherwise, it will return 1046/// false. Either way, the type @p R will be updated to reflect a 1047/// well-formed type for the constructor. 1048bool Sema::CheckConstructorDeclarator(Declarator &D, QualType &R, 1049 FunctionDecl::StorageClass& SC) { 1050 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1051 bool isInvalid = false; 1052 1053 // C++ [class.ctor]p3: 1054 // A constructor shall not be virtual (10.3) or static (9.4). A 1055 // constructor can be invoked for a const, volatile or const 1056 // volatile object. A constructor shall not be declared const, 1057 // volatile, or const volatile (9.3.2). 1058 if (isVirtual) { 1059 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1060 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1061 << SourceRange(D.getIdentifierLoc()); 1062 isInvalid = true; 1063 } 1064 if (SC == FunctionDecl::Static) { 1065 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1066 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1067 << SourceRange(D.getIdentifierLoc()); 1068 isInvalid = true; 1069 SC = FunctionDecl::None; 1070 } 1071 if (D.getDeclSpec().hasTypeSpecifier()) { 1072 // Constructors don't have return types, but the parser will 1073 // happily parse something like: 1074 // 1075 // class X { 1076 // float X(float); 1077 // }; 1078 // 1079 // The return type will be eliminated later. 1080 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 1081 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1082 << SourceRange(D.getIdentifierLoc()); 1083 } 1084 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1085 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1086 if (FTI.TypeQuals & QualType::Const) 1087 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1088 << "const" << SourceRange(D.getIdentifierLoc()); 1089 if (FTI.TypeQuals & QualType::Volatile) 1090 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1091 << "volatile" << SourceRange(D.getIdentifierLoc()); 1092 if (FTI.TypeQuals & QualType::Restrict) 1093 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1094 << "restrict" << SourceRange(D.getIdentifierLoc()); 1095 } 1096 1097 // Rebuild the function type "R" without any type qualifiers (in 1098 // case any of the errors above fired) and with "void" as the 1099 // return type, since constructors don't have return types. We 1100 // *always* have to do this, because GetTypeForDeclarator will 1101 // put in a result type of "int" when none was specified. 1102 const FunctionTypeProto *Proto = R->getAsFunctionTypeProto(); 1103 R = Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1104 Proto->getNumArgs(), 1105 Proto->isVariadic(), 1106 0); 1107 1108 return isInvalid; 1109} 1110 1111/// CheckConstructor - Checks a fully-formed constructor for 1112/// well-formedness, issuing any diagnostics required. Returns true if 1113/// the constructor declarator is invalid. 1114bool Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1115 if (Constructor->isInvalidDecl()) 1116 return true; 1117 1118 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1119 bool Invalid = false; 1120 1121 // C++ [class.copy]p3: 1122 // A declaration of a constructor for a class X is ill-formed if 1123 // its first parameter is of type (optionally cv-qualified) X and 1124 // either there are no other parameters or else all other 1125 // parameters have default arguments. 1126 if ((Constructor->getNumParams() == 1) || 1127 (Constructor->getNumParams() > 1 && 1128 Constructor->getParamDecl(1)->getDefaultArg() != 0)) { 1129 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1130 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1131 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1132 Diag(Constructor->getLocation(), diag::err_constructor_byvalue_arg) 1133 << SourceRange(Constructor->getParamDecl(0)->getLocation()); 1134 Invalid = true; 1135 } 1136 } 1137 1138 // Notify the class that we've added a constructor. 1139 ClassDecl->addedConstructor(Context, Constructor); 1140 1141 return Invalid; 1142} 1143 1144/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1145/// the well-formednes of the destructor declarator @p D with type @p 1146/// R. If there are any errors in the declarator, this routine will 1147/// emit diagnostics and return true. Otherwise, it will return 1148/// false. Either way, the type @p R will be updated to reflect a 1149/// well-formed type for the destructor. 1150bool Sema::CheckDestructorDeclarator(Declarator &D, QualType &R, 1151 FunctionDecl::StorageClass& SC) { 1152 bool isInvalid = false; 1153 1154 // C++ [class.dtor]p1: 1155 // [...] A typedef-name that names a class is a class-name 1156 // (7.1.3); however, a typedef-name that names a class shall not 1157 // be used as the identifier in the declarator for a destructor 1158 // declaration. 1159 TypeDecl *DeclaratorTypeD = (TypeDecl *)D.getDeclaratorIdType(); 1160 if (const TypedefDecl *TypedefD = dyn_cast<TypedefDecl>(DeclaratorTypeD)) { 1161 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1162 << TypedefD->getDeclName(); 1163 isInvalid = true; 1164 } 1165 1166 // C++ [class.dtor]p2: 1167 // A destructor is used to destroy objects of its class type. A 1168 // destructor takes no parameters, and no return type can be 1169 // specified for it (not even void). The address of a destructor 1170 // shall not be taken. A destructor shall not be static. A 1171 // destructor can be invoked for a const, volatile or const 1172 // volatile object. A destructor shall not be declared const, 1173 // volatile or const volatile (9.3.2). 1174 if (SC == FunctionDecl::Static) { 1175 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1176 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1177 << SourceRange(D.getIdentifierLoc()); 1178 isInvalid = true; 1179 SC = FunctionDecl::None; 1180 } 1181 if (D.getDeclSpec().hasTypeSpecifier()) { 1182 // Destructors don't have return types, but the parser will 1183 // happily parse something like: 1184 // 1185 // class X { 1186 // float ~X(); 1187 // }; 1188 // 1189 // The return type will be eliminated later. 1190 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1191 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1192 << SourceRange(D.getIdentifierLoc()); 1193 } 1194 if (R->getAsFunctionTypeProto()->getTypeQuals() != 0) { 1195 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1196 if (FTI.TypeQuals & QualType::Const) 1197 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1198 << "const" << SourceRange(D.getIdentifierLoc()); 1199 if (FTI.TypeQuals & QualType::Volatile) 1200 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1201 << "volatile" << SourceRange(D.getIdentifierLoc()); 1202 if (FTI.TypeQuals & QualType::Restrict) 1203 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1204 << "restrict" << SourceRange(D.getIdentifierLoc()); 1205 } 1206 1207 // Make sure we don't have any parameters. 1208 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1209 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1210 1211 // Delete the parameters. 1212 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1213 if (FTI.NumArgs) { 1214 delete [] FTI.ArgInfo; 1215 FTI.NumArgs = 0; 1216 FTI.ArgInfo = 0; 1217 } 1218 } 1219 1220 // Make sure the destructor isn't variadic. 1221 if (R->getAsFunctionTypeProto()->isVariadic()) 1222 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1223 1224 // Rebuild the function type "R" without any type qualifiers or 1225 // parameters (in case any of the errors above fired) and with 1226 // "void" as the return type, since destructors don't have return 1227 // types. We *always* have to do this, because GetTypeForDeclarator 1228 // will put in a result type of "int" when none was specified. 1229 R = Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1230 1231 return isInvalid; 1232} 1233 1234/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1235/// well-formednes of the conversion function declarator @p D with 1236/// type @p R. If there are any errors in the declarator, this routine 1237/// will emit diagnostics and return true. Otherwise, it will return 1238/// false. Either way, the type @p R will be updated to reflect a 1239/// well-formed type for the conversion operator. 1240bool Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1241 FunctionDecl::StorageClass& SC) { 1242 bool isInvalid = false; 1243 1244 // C++ [class.conv.fct]p1: 1245 // Neither parameter types nor return type can be specified. The 1246 // type of a conversion function (8.3.5) is “function taking no 1247 // parameter returning conversion-type-id.” 1248 if (SC == FunctionDecl::Static) { 1249 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1250 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1251 << SourceRange(D.getIdentifierLoc()); 1252 isInvalid = true; 1253 SC = FunctionDecl::None; 1254 } 1255 if (D.getDeclSpec().hasTypeSpecifier()) { 1256 // Conversion functions don't have return types, but the parser will 1257 // happily parse something like: 1258 // 1259 // class X { 1260 // float operator bool(); 1261 // }; 1262 // 1263 // The return type will be changed later anyway. 1264 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1265 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1266 << SourceRange(D.getIdentifierLoc()); 1267 } 1268 1269 // Make sure we don't have any parameters. 1270 if (R->getAsFunctionTypeProto()->getNumArgs() > 0) { 1271 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1272 1273 // Delete the parameters. 1274 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1275 if (FTI.NumArgs) { 1276 delete [] FTI.ArgInfo; 1277 FTI.NumArgs = 0; 1278 FTI.ArgInfo = 0; 1279 } 1280 } 1281 1282 // Make sure the conversion function isn't variadic. 1283 if (R->getAsFunctionTypeProto()->isVariadic()) 1284 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1285 1286 // C++ [class.conv.fct]p4: 1287 // The conversion-type-id shall not represent a function type nor 1288 // an array type. 1289 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1290 if (ConvType->isArrayType()) { 1291 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1292 ConvType = Context.getPointerType(ConvType); 1293 } else if (ConvType->isFunctionType()) { 1294 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1295 ConvType = Context.getPointerType(ConvType); 1296 } 1297 1298 // Rebuild the function type "R" without any parameters (in case any 1299 // of the errors above fired) and with the conversion type as the 1300 // return type. 1301 R = Context.getFunctionType(ConvType, 0, 0, false, 1302 R->getAsFunctionTypeProto()->getTypeQuals()); 1303 1304 // C++0x explicit conversion operators. 1305 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1306 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1307 diag::warn_explicit_conversion_functions) 1308 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1309 1310 return isInvalid; 1311} 1312 1313/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1314/// the declaration of the given C++ conversion function. This routine 1315/// is responsible for recording the conversion function in the C++ 1316/// class, if possible. 1317Sema::DeclTy *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1318 assert(Conversion && "Expected to receive a conversion function declaration"); 1319 1320 // Set the lexical context of this conversion function 1321 Conversion->setLexicalDeclContext(CurContext); 1322 1323 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1324 1325 // Make sure we aren't redeclaring the conversion function. 1326 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1327 1328 // C++ [class.conv.fct]p1: 1329 // [...] A conversion function is never used to convert a 1330 // (possibly cv-qualified) object to the (possibly cv-qualified) 1331 // same object type (or a reference to it), to a (possibly 1332 // cv-qualified) base class of that type (or a reference to it), 1333 // or to (possibly cv-qualified) void. 1334 // FIXME: Suppress this warning if the conversion function ends up 1335 // being a virtual function that overrides a virtual function in a 1336 // base class. 1337 QualType ClassType 1338 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1339 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1340 ConvType = ConvTypeRef->getPointeeType(); 1341 if (ConvType->isRecordType()) { 1342 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1343 if (ConvType == ClassType) 1344 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1345 << ClassType; 1346 else if (IsDerivedFrom(ClassType, ConvType)) 1347 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1348 << ClassType << ConvType; 1349 } else if (ConvType->isVoidType()) { 1350 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1351 << ClassType << ConvType; 1352 } 1353 1354 if (Conversion->getPreviousDeclaration()) { 1355 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1356 for (OverloadedFunctionDecl::function_iterator 1357 Conv = Conversions->function_begin(), 1358 ConvEnd = Conversions->function_end(); 1359 Conv != ConvEnd; ++Conv) { 1360 if (*Conv == Conversion->getPreviousDeclaration()) { 1361 *Conv = Conversion; 1362 return (DeclTy *)Conversion; 1363 } 1364 } 1365 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1366 } else 1367 ClassDecl->addConversionFunction(Context, Conversion); 1368 1369 return (DeclTy *)Conversion; 1370} 1371 1372//===----------------------------------------------------------------------===// 1373// Namespace Handling 1374//===----------------------------------------------------------------------===// 1375 1376/// ActOnStartNamespaceDef - This is called at the start of a namespace 1377/// definition. 1378Sema::DeclTy *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1379 SourceLocation IdentLoc, 1380 IdentifierInfo *II, 1381 SourceLocation LBrace) { 1382 NamespaceDecl *Namespc = 1383 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1384 Namespc->setLBracLoc(LBrace); 1385 1386 Scope *DeclRegionScope = NamespcScope->getParent(); 1387 1388 if (II) { 1389 // C++ [namespace.def]p2: 1390 // The identifier in an original-namespace-definition shall not have been 1391 // previously defined in the declarative region in which the 1392 // original-namespace-definition appears. The identifier in an 1393 // original-namespace-definition is the name of the namespace. Subsequently 1394 // in that declarative region, it is treated as an original-namespace-name. 1395 1396 Decl *PrevDecl = 1397 LookupDecl(II, Decl::IDNS_Ordinary, DeclRegionScope, 0, 1398 /*enableLazyBuiltinCreation=*/false, 1399 /*LookupInParent=*/false); 1400 1401 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1402 // This is an extended namespace definition. 1403 // Attach this namespace decl to the chain of extended namespace 1404 // definitions. 1405 OrigNS->setNextNamespace(Namespc); 1406 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1407 1408 // Remove the previous declaration from the scope. 1409 if (DeclRegionScope->isDeclScope(OrigNS)) { 1410 IdResolver.RemoveDecl(OrigNS); 1411 DeclRegionScope->RemoveDecl(OrigNS); 1412 } 1413 } else if (PrevDecl) { 1414 // This is an invalid name redefinition. 1415 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1416 << Namespc->getDeclName(); 1417 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1418 Namespc->setInvalidDecl(); 1419 // Continue on to push Namespc as current DeclContext and return it. 1420 } 1421 1422 PushOnScopeChains(Namespc, DeclRegionScope); 1423 } else { 1424 // FIXME: Handle anonymous namespaces 1425 } 1426 1427 // Although we could have an invalid decl (i.e. the namespace name is a 1428 // redefinition), push it as current DeclContext and try to continue parsing. 1429 // FIXME: We should be able to push Namespc here, so that the 1430 // each DeclContext for the namespace has the declarations 1431 // that showed up in that particular namespace definition. 1432 PushDeclContext(NamespcScope, Namespc); 1433 return Namespc; 1434} 1435 1436/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1437/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1438void Sema::ActOnFinishNamespaceDef(DeclTy *D, SourceLocation RBrace) { 1439 Decl *Dcl = static_cast<Decl *>(D); 1440 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1441 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1442 Namespc->setRBracLoc(RBrace); 1443 PopDeclContext(); 1444} 1445 1446Sema::DeclTy *Sema::ActOnUsingDirective(Scope *S, 1447 SourceLocation UsingLoc, 1448 SourceLocation NamespcLoc, 1449 const CXXScopeSpec &SS, 1450 SourceLocation IdentLoc, 1451 IdentifierInfo *NamespcName, 1452 AttributeList *AttrList) { 1453 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1454 assert(NamespcName && "Invalid NamespcName."); 1455 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1456 1457 // FIXME: This still requires lot more checks, and AST support. 1458 1459 // Lookup namespace name. 1460 LookupCriteria Criteria(LookupCriteria::Namespace, /*RedeclarationOnly=*/false, 1461 /*CPlusPlus=*/true); 1462 Decl *NS = 0; 1463 if (SS.isSet()) 1464 NS = LookupQualifiedName(static_cast<DeclContext*>(SS.getScopeRep()), 1465 NamespcName, Criteria); 1466 else 1467 NS = LookupName(S, NamespcName, Criteria); 1468 1469 if (NS) { 1470 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1471 } else { 1472 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1473 } 1474 1475 // FIXME: We ignore AttrList for now, and delete it to avoid leak. 1476 delete AttrList; 1477 return 0; 1478} 1479 1480/// AddCXXDirectInitializerToDecl - This action is called immediately after 1481/// ActOnDeclarator, when a C++ direct initializer is present. 1482/// e.g: "int x(1);" 1483void Sema::AddCXXDirectInitializerToDecl(DeclTy *Dcl, SourceLocation LParenLoc, 1484 ExprTy **ExprTys, unsigned NumExprs, 1485 SourceLocation *CommaLocs, 1486 SourceLocation RParenLoc) { 1487 assert(NumExprs != 0 && ExprTys && "missing expressions"); 1488 Decl *RealDecl = static_cast<Decl *>(Dcl); 1489 1490 // If there is no declaration, there was an error parsing it. Just ignore 1491 // the initializer. 1492 if (RealDecl == 0) { 1493 for (unsigned i = 0; i != NumExprs; ++i) 1494 delete static_cast<Expr *>(ExprTys[i]); 1495 return; 1496 } 1497 1498 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 1499 if (!VDecl) { 1500 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 1501 RealDecl->setInvalidDecl(); 1502 return; 1503 } 1504 1505 // We will treat direct-initialization as a copy-initialization: 1506 // int x(1); -as-> int x = 1; 1507 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 1508 // 1509 // Clients that want to distinguish between the two forms, can check for 1510 // direct initializer using VarDecl::hasCXXDirectInitializer(). 1511 // A major benefit is that clients that don't particularly care about which 1512 // exactly form was it (like the CodeGen) can handle both cases without 1513 // special case code. 1514 1515 // C++ 8.5p11: 1516 // The form of initialization (using parentheses or '=') is generally 1517 // insignificant, but does matter when the entity being initialized has a 1518 // class type. 1519 QualType DeclInitType = VDecl->getType(); 1520 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 1521 DeclInitType = Array->getElementType(); 1522 1523 if (VDecl->getType()->isRecordType()) { 1524 CXXConstructorDecl *Constructor 1525 = PerformInitializationByConstructor(DeclInitType, 1526 (Expr **)ExprTys, NumExprs, 1527 VDecl->getLocation(), 1528 SourceRange(VDecl->getLocation(), 1529 RParenLoc), 1530 VDecl->getDeclName(), 1531 IK_Direct); 1532 if (!Constructor) { 1533 RealDecl->setInvalidDecl(); 1534 } 1535 1536 // Let clients know that initialization was done with a direct 1537 // initializer. 1538 VDecl->setCXXDirectInitializer(true); 1539 1540 // FIXME: Add ExprTys and Constructor to the RealDecl as part of 1541 // the initializer. 1542 return; 1543 } 1544 1545 if (NumExprs > 1) { 1546 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 1547 << SourceRange(VDecl->getLocation(), RParenLoc); 1548 RealDecl->setInvalidDecl(); 1549 return; 1550 } 1551 1552 // Let clients know that initialization was done with a direct initializer. 1553 VDecl->setCXXDirectInitializer(true); 1554 1555 assert(NumExprs == 1 && "Expected 1 expression"); 1556 // Set the init expression, handles conversions. 1557 AddInitializerToDecl(Dcl, ExprArg(*this, ExprTys[0]), /*DirectInit=*/true); 1558} 1559 1560/// PerformInitializationByConstructor - Perform initialization by 1561/// constructor (C++ [dcl.init]p14), which may occur as part of 1562/// direct-initialization or copy-initialization. We are initializing 1563/// an object of type @p ClassType with the given arguments @p 1564/// Args. @p Loc is the location in the source code where the 1565/// initializer occurs (e.g., a declaration, member initializer, 1566/// functional cast, etc.) while @p Range covers the whole 1567/// initialization. @p InitEntity is the entity being initialized, 1568/// which may by the name of a declaration or a type. @p Kind is the 1569/// kind of initialization we're performing, which affects whether 1570/// explicit constructors will be considered. When successful, returns 1571/// the constructor that will be used to perform the initialization; 1572/// when the initialization fails, emits a diagnostic and returns 1573/// null. 1574CXXConstructorDecl * 1575Sema::PerformInitializationByConstructor(QualType ClassType, 1576 Expr **Args, unsigned NumArgs, 1577 SourceLocation Loc, SourceRange Range, 1578 DeclarationName InitEntity, 1579 InitializationKind Kind) { 1580 const RecordType *ClassRec = ClassType->getAsRecordType(); 1581 assert(ClassRec && "Can only initialize a class type here"); 1582 1583 // C++ [dcl.init]p14: 1584 // 1585 // If the initialization is direct-initialization, or if it is 1586 // copy-initialization where the cv-unqualified version of the 1587 // source type is the same class as, or a derived class of, the 1588 // class of the destination, constructors are considered. The 1589 // applicable constructors are enumerated (13.3.1.3), and the 1590 // best one is chosen through overload resolution (13.3). The 1591 // constructor so selected is called to initialize the object, 1592 // with the initializer expression(s) as its argument(s). If no 1593 // constructor applies, or the overload resolution is ambiguous, 1594 // the initialization is ill-formed. 1595 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 1596 OverloadCandidateSet CandidateSet; 1597 1598 // Add constructors to the overload set. 1599 DeclarationName ConstructorName 1600 = Context.DeclarationNames.getCXXConstructorName( 1601 Context.getCanonicalType(ClassType.getUnqualifiedType())); 1602 DeclContext::lookup_const_iterator Con, ConEnd; 1603 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 1604 Con != ConEnd; ++Con) { 1605 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 1606 if ((Kind == IK_Direct) || 1607 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 1608 (Kind == IK_Default && Constructor->isDefaultConstructor())) 1609 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 1610 } 1611 1612 // FIXME: When we decide not to synthesize the implicitly-declared 1613 // constructors, we'll need to make them appear here. 1614 1615 OverloadCandidateSet::iterator Best; 1616 switch (BestViableFunction(CandidateSet, Best)) { 1617 case OR_Success: 1618 // We found a constructor. Return it. 1619 return cast<CXXConstructorDecl>(Best->Function); 1620 1621 case OR_No_Viable_Function: 1622 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 1623 << InitEntity << (unsigned)CandidateSet.size() << Range; 1624 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1625 return 0; 1626 1627 case OR_Ambiguous: 1628 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 1629 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1630 return 0; 1631 } 1632 1633 return 0; 1634} 1635 1636/// CompareReferenceRelationship - Compare the two types T1 and T2 to 1637/// determine whether they are reference-related, 1638/// reference-compatible, reference-compatible with added 1639/// qualification, or incompatible, for use in C++ initialization by 1640/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 1641/// type, and the first type (T1) is the pointee type of the reference 1642/// type being initialized. 1643Sema::ReferenceCompareResult 1644Sema::CompareReferenceRelationship(QualType T1, QualType T2, 1645 bool& DerivedToBase) { 1646 assert(!T1->isReferenceType() && "T1 must be the pointee type of the reference type"); 1647 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 1648 1649 T1 = Context.getCanonicalType(T1); 1650 T2 = Context.getCanonicalType(T2); 1651 QualType UnqualT1 = T1.getUnqualifiedType(); 1652 QualType UnqualT2 = T2.getUnqualifiedType(); 1653 1654 // C++ [dcl.init.ref]p4: 1655 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 1656 // reference-related to “cv2 T2” if T1 is the same type as T2, or 1657 // T1 is a base class of T2. 1658 if (UnqualT1 == UnqualT2) 1659 DerivedToBase = false; 1660 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 1661 DerivedToBase = true; 1662 else 1663 return Ref_Incompatible; 1664 1665 // At this point, we know that T1 and T2 are reference-related (at 1666 // least). 1667 1668 // C++ [dcl.init.ref]p4: 1669 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 1670 // reference-related to T2 and cv1 is the same cv-qualification 1671 // as, or greater cv-qualification than, cv2. For purposes of 1672 // overload resolution, cases for which cv1 is greater 1673 // cv-qualification than cv2 are identified as 1674 // reference-compatible with added qualification (see 13.3.3.2). 1675 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1676 return Ref_Compatible; 1677 else if (T1.isMoreQualifiedThan(T2)) 1678 return Ref_Compatible_With_Added_Qualification; 1679 else 1680 return Ref_Related; 1681} 1682 1683/// CheckReferenceInit - Check the initialization of a reference 1684/// variable with the given initializer (C++ [dcl.init.ref]). Init is 1685/// the initializer (either a simple initializer or an initializer 1686/// list), and DeclType is the type of the declaration. When ICS is 1687/// non-null, this routine will compute the implicit conversion 1688/// sequence according to C++ [over.ics.ref] and will not produce any 1689/// diagnostics; when ICS is null, it will emit diagnostics when any 1690/// errors are found. Either way, a return value of true indicates 1691/// that there was a failure, a return value of false indicates that 1692/// the reference initialization succeeded. 1693/// 1694/// When @p SuppressUserConversions, user-defined conversions are 1695/// suppressed. 1696/// When @p AllowExplicit, we also permit explicit user-defined 1697/// conversion functions. 1698bool 1699Sema::CheckReferenceInit(Expr *&Init, QualType &DeclType, 1700 ImplicitConversionSequence *ICS, 1701 bool SuppressUserConversions, 1702 bool AllowExplicit) { 1703 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 1704 1705 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 1706 QualType T2 = Init->getType(); 1707 1708 // If the initializer is the address of an overloaded function, try 1709 // to resolve the overloaded function. If all goes well, T2 is the 1710 // type of the resulting function. 1711 if (T2->isOverloadType()) { 1712 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 1713 ICS != 0); 1714 if (Fn) { 1715 // Since we're performing this reference-initialization for 1716 // real, update the initializer with the resulting function. 1717 if (!ICS) 1718 FixOverloadedFunctionReference(Init, Fn); 1719 1720 T2 = Fn->getType(); 1721 } 1722 } 1723 1724 // Compute some basic properties of the types and the initializer. 1725 bool DerivedToBase = false; 1726 Expr::isLvalueResult InitLvalue = Init->isLvalue(Context); 1727 ReferenceCompareResult RefRelationship 1728 = CompareReferenceRelationship(T1, T2, DerivedToBase); 1729 1730 // Most paths end in a failed conversion. 1731 if (ICS) 1732 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 1733 1734 // C++ [dcl.init.ref]p5: 1735 // A reference to type “cv1 T1” is initialized by an expression 1736 // of type “cv2 T2” as follows: 1737 1738 // -- If the initializer expression 1739 1740 bool BindsDirectly = false; 1741 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 1742 // reference-compatible with “cv2 T2,” or 1743 // 1744 // Note that the bit-field check is skipped if we are just computing 1745 // the implicit conversion sequence (C++ [over.best.ics]p2). 1746 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->isBitField()) && 1747 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1748 BindsDirectly = true; 1749 1750 if (ICS) { 1751 // C++ [over.ics.ref]p1: 1752 // When a parameter of reference type binds directly (8.5.3) 1753 // to an argument expression, the implicit conversion sequence 1754 // is the identity conversion, unless the argument expression 1755 // has a type that is a derived class of the parameter type, 1756 // in which case the implicit conversion sequence is a 1757 // derived-to-base Conversion (13.3.3.1). 1758 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1759 ICS->Standard.First = ICK_Identity; 1760 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1761 ICS->Standard.Third = ICK_Identity; 1762 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1763 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1764 ICS->Standard.ReferenceBinding = true; 1765 ICS->Standard.DirectBinding = true; 1766 1767 // Nothing more to do: the inaccessibility/ambiguity check for 1768 // derived-to-base conversions is suppressed when we're 1769 // computing the implicit conversion sequence (C++ 1770 // [over.best.ics]p2). 1771 return false; 1772 } else { 1773 // Perform the conversion. 1774 // FIXME: Binding to a subobject of the lvalue is going to require 1775 // more AST annotation than this. 1776 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1777 } 1778 } 1779 1780 // -- has a class type (i.e., T2 is a class type) and can be 1781 // implicitly converted to an lvalue of type “cv3 T3,” 1782 // where “cv1 T1” is reference-compatible with “cv3 T3” 1783 // 92) (this conversion is selected by enumerating the 1784 // applicable conversion functions (13.3.1.6) and choosing 1785 // the best one through overload resolution (13.3)), 1786 if (!SuppressUserConversions && T2->isRecordType()) { 1787 // FIXME: Look for conversions in base classes! 1788 CXXRecordDecl *T2RecordDecl 1789 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 1790 1791 OverloadCandidateSet CandidateSet; 1792 OverloadedFunctionDecl *Conversions 1793 = T2RecordDecl->getConversionFunctions(); 1794 for (OverloadedFunctionDecl::function_iterator Func 1795 = Conversions->function_begin(); 1796 Func != Conversions->function_end(); ++Func) { 1797 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 1798 1799 // If the conversion function doesn't return a reference type, 1800 // it can't be considered for this conversion. 1801 // FIXME: This will change when we support rvalue references. 1802 if (Conv->getConversionType()->isReferenceType() && 1803 (AllowExplicit || !Conv->isExplicit())) 1804 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 1805 } 1806 1807 OverloadCandidateSet::iterator Best; 1808 switch (BestViableFunction(CandidateSet, Best)) { 1809 case OR_Success: 1810 // This is a direct binding. 1811 BindsDirectly = true; 1812 1813 if (ICS) { 1814 // C++ [over.ics.ref]p1: 1815 // 1816 // [...] If the parameter binds directly to the result of 1817 // applying a conversion function to the argument 1818 // expression, the implicit conversion sequence is a 1819 // user-defined conversion sequence (13.3.3.1.2), with the 1820 // second standard conversion sequence either an identity 1821 // conversion or, if the conversion function returns an 1822 // entity of a type that is a derived class of the parameter 1823 // type, a derived-to-base Conversion. 1824 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 1825 ICS->UserDefined.Before = Best->Conversions[0].Standard; 1826 ICS->UserDefined.After = Best->FinalConversion; 1827 ICS->UserDefined.ConversionFunction = Best->Function; 1828 assert(ICS->UserDefined.After.ReferenceBinding && 1829 ICS->UserDefined.After.DirectBinding && 1830 "Expected a direct reference binding!"); 1831 return false; 1832 } else { 1833 // Perform the conversion. 1834 // FIXME: Binding to a subobject of the lvalue is going to require 1835 // more AST annotation than this. 1836 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1837 } 1838 break; 1839 1840 case OR_Ambiguous: 1841 assert(false && "Ambiguous reference binding conversions not implemented."); 1842 return true; 1843 1844 case OR_No_Viable_Function: 1845 // There was no suitable conversion; continue with other checks. 1846 break; 1847 } 1848 } 1849 1850 if (BindsDirectly) { 1851 // C++ [dcl.init.ref]p4: 1852 // [...] In all cases where the reference-related or 1853 // reference-compatible relationship of two types is used to 1854 // establish the validity of a reference binding, and T1 is a 1855 // base class of T2, a program that necessitates such a binding 1856 // is ill-formed if T1 is an inaccessible (clause 11) or 1857 // ambiguous (10.2) base class of T2. 1858 // 1859 // Note that we only check this condition when we're allowed to 1860 // complain about errors, because we should not be checking for 1861 // ambiguity (or inaccessibility) unless the reference binding 1862 // actually happens. 1863 if (DerivedToBase) 1864 return CheckDerivedToBaseConversion(T2, T1, 1865 Init->getSourceRange().getBegin(), 1866 Init->getSourceRange()); 1867 else 1868 return false; 1869 } 1870 1871 // -- Otherwise, the reference shall be to a non-volatile const 1872 // type (i.e., cv1 shall be const). 1873 if (T1.getCVRQualifiers() != QualType::Const) { 1874 if (!ICS) 1875 Diag(Init->getSourceRange().getBegin(), 1876 diag::err_not_reference_to_const_init) 1877 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1878 << T2 << Init->getSourceRange(); 1879 return true; 1880 } 1881 1882 // -- If the initializer expression is an rvalue, with T2 a 1883 // class type, and “cv1 T1” is reference-compatible with 1884 // “cv2 T2,” the reference is bound in one of the 1885 // following ways (the choice is implementation-defined): 1886 // 1887 // -- The reference is bound to the object represented by 1888 // the rvalue (see 3.10) or to a sub-object within that 1889 // object. 1890 // 1891 // -- A temporary of type “cv1 T2” [sic] is created, and 1892 // a constructor is called to copy the entire rvalue 1893 // object into the temporary. The reference is bound to 1894 // the temporary or to a sub-object within the 1895 // temporary. 1896 // 1897 // 1898 // The constructor that would be used to make the copy 1899 // shall be callable whether or not the copy is actually 1900 // done. 1901 // 1902 // Note that C++0x [dcl.ref.init]p5 takes away this implementation 1903 // freedom, so we will always take the first option and never build 1904 // a temporary in this case. FIXME: We will, however, have to check 1905 // for the presence of a copy constructor in C++98/03 mode. 1906 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 1907 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 1908 if (ICS) { 1909 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 1910 ICS->Standard.First = ICK_Identity; 1911 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 1912 ICS->Standard.Third = ICK_Identity; 1913 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 1914 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 1915 ICS->Standard.ReferenceBinding = true; 1916 ICS->Standard.DirectBinding = false; 1917 } else { 1918 // FIXME: Binding to a subobject of the rvalue is going to require 1919 // more AST annotation than this. 1920 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 1921 } 1922 return false; 1923 } 1924 1925 // -- Otherwise, a temporary of type “cv1 T1” is created and 1926 // initialized from the initializer expression using the 1927 // rules for a non-reference copy initialization (8.5). The 1928 // reference is then bound to the temporary. If T1 is 1929 // reference-related to T2, cv1 must be the same 1930 // cv-qualification as, or greater cv-qualification than, 1931 // cv2; otherwise, the program is ill-formed. 1932 if (RefRelationship == Ref_Related) { 1933 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 1934 // we would be reference-compatible or reference-compatible with 1935 // added qualification. But that wasn't the case, so the reference 1936 // initialization fails. 1937 if (!ICS) 1938 Diag(Init->getSourceRange().getBegin(), 1939 diag::err_reference_init_drops_quals) 1940 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 1941 << T2 << Init->getSourceRange(); 1942 return true; 1943 } 1944 1945 // Actually try to convert the initializer to T1. 1946 if (ICS) { 1947 /// C++ [over.ics.ref]p2: 1948 /// 1949 /// When a parameter of reference type is not bound directly to 1950 /// an argument expression, the conversion sequence is the one 1951 /// required to convert the argument expression to the 1952 /// underlying type of the reference according to 1953 /// 13.3.3.1. Conceptually, this conversion sequence corresponds 1954 /// to copy-initializing a temporary of the underlying type with 1955 /// the argument expression. Any difference in top-level 1956 /// cv-qualification is subsumed by the initialization itself 1957 /// and does not constitute a conversion. 1958 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 1959 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 1960 } else { 1961 return PerformImplicitConversion(Init, T1, "initializing"); 1962 } 1963} 1964 1965/// CheckOverloadedOperatorDeclaration - Check whether the declaration 1966/// of this overloaded operator is well-formed. If so, returns false; 1967/// otherwise, emits appropriate diagnostics and returns true. 1968bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 1969 assert(FnDecl && FnDecl->isOverloadedOperator() && 1970 "Expected an overloaded operator declaration"); 1971 1972 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 1973 1974 // C++ [over.oper]p5: 1975 // The allocation and deallocation functions, operator new, 1976 // operator new[], operator delete and operator delete[], are 1977 // described completely in 3.7.3. The attributes and restrictions 1978 // found in the rest of this subclause do not apply to them unless 1979 // explicitly stated in 3.7.3. 1980 // FIXME: Write a separate routine for checking this. For now, just 1981 // allow it. 1982 if (Op == OO_New || Op == OO_Array_New || 1983 Op == OO_Delete || Op == OO_Array_Delete) 1984 return false; 1985 1986 // C++ [over.oper]p6: 1987 // An operator function shall either be a non-static member 1988 // function or be a non-member function and have at least one 1989 // parameter whose type is a class, a reference to a class, an 1990 // enumeration, or a reference to an enumeration. 1991 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 1992 if (MethodDecl->isStatic()) 1993 return Diag(FnDecl->getLocation(), 1994 diag::err_operator_overload_static) << FnDecl->getDeclName(); 1995 } else { 1996 bool ClassOrEnumParam = false; 1997 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 1998 ParamEnd = FnDecl->param_end(); 1999 Param != ParamEnd; ++Param) { 2000 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2001 if (ParamType->isRecordType() || ParamType->isEnumeralType()) { 2002 ClassOrEnumParam = true; 2003 break; 2004 } 2005 } 2006 2007 if (!ClassOrEnumParam) 2008 return Diag(FnDecl->getLocation(), 2009 diag::err_operator_overload_needs_class_or_enum) 2010 << FnDecl->getDeclName(); 2011 } 2012 2013 // C++ [over.oper]p8: 2014 // An operator function cannot have default arguments (8.3.6), 2015 // except where explicitly stated below. 2016 // 2017 // Only the function-call operator allows default arguments 2018 // (C++ [over.call]p1). 2019 if (Op != OO_Call) { 2020 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2021 Param != FnDecl->param_end(); ++Param) { 2022 if ((*Param)->hasUnparsedDefaultArg()) 2023 return Diag((*Param)->getLocation(), 2024 diag::err_operator_overload_default_arg) 2025 << FnDecl->getDeclName(); 2026 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2027 return Diag((*Param)->getLocation(), 2028 diag::err_operator_overload_default_arg) 2029 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2030 } 2031 } 2032 2033 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2034 { false, false, false } 2035#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2036 , { Unary, Binary, MemberOnly } 2037#include "clang/Basic/OperatorKinds.def" 2038 }; 2039 2040 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2041 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2042 bool MustBeMemberOperator = OperatorUses[Op][2]; 2043 2044 // C++ [over.oper]p8: 2045 // [...] Operator functions cannot have more or fewer parameters 2046 // than the number required for the corresponding operator, as 2047 // described in the rest of this subclause. 2048 unsigned NumParams = FnDecl->getNumParams() 2049 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2050 if (Op != OO_Call && 2051 ((NumParams == 1 && !CanBeUnaryOperator) || 2052 (NumParams == 2 && !CanBeBinaryOperator) || 2053 (NumParams < 1) || (NumParams > 2))) { 2054 // We have the wrong number of parameters. 2055 unsigned ErrorKind; 2056 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2057 ErrorKind = 2; // 2 -> unary or binary. 2058 } else if (CanBeUnaryOperator) { 2059 ErrorKind = 0; // 0 -> unary 2060 } else { 2061 assert(CanBeBinaryOperator && 2062 "All non-call overloaded operators are unary or binary!"); 2063 ErrorKind = 1; // 1 -> binary 2064 } 2065 2066 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2067 << FnDecl->getDeclName() << NumParams << ErrorKind; 2068 } 2069 2070 // Overloaded operators other than operator() cannot be variadic. 2071 if (Op != OO_Call && 2072 FnDecl->getType()->getAsFunctionTypeProto()->isVariadic()) { 2073 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2074 << FnDecl->getDeclName(); 2075 } 2076 2077 // Some operators must be non-static member functions. 2078 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2079 return Diag(FnDecl->getLocation(), 2080 diag::err_operator_overload_must_be_member) 2081 << FnDecl->getDeclName(); 2082 } 2083 2084 // C++ [over.inc]p1: 2085 // The user-defined function called operator++ implements the 2086 // prefix and postfix ++ operator. If this function is a member 2087 // function with no parameters, or a non-member function with one 2088 // parameter of class or enumeration type, it defines the prefix 2089 // increment operator ++ for objects of that type. If the function 2090 // is a member function with one parameter (which shall be of type 2091 // int) or a non-member function with two parameters (the second 2092 // of which shall be of type int), it defines the postfix 2093 // increment operator ++ for objects of that type. 2094 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 2095 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 2096 bool ParamIsInt = false; 2097 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 2098 ParamIsInt = BT->getKind() == BuiltinType::Int; 2099 2100 if (!ParamIsInt) 2101 return Diag(LastParam->getLocation(), 2102 diag::err_operator_overload_post_incdec_must_be_int) 2103 << LastParam->getType() << (Op == OO_MinusMinus); 2104 } 2105 2106 // Notify the class if it got an assignment operator. 2107 if (Op == OO_Equal) { 2108 // Would have returned earlier otherwise. 2109 assert(isa<CXXMethodDecl>(FnDecl) && 2110 "Overloaded = not member, but not filtered."); 2111 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 2112 Method->getParent()->addedAssignmentOperator(Context, Method); 2113 } 2114 2115 return false; 2116} 2117 2118/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 2119/// linkage specification, including the language and (if present) 2120/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 2121/// the location of the language string literal, which is provided 2122/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 2123/// the '{' brace. Otherwise, this linkage specification does not 2124/// have any braces. 2125Sema::DeclTy *Sema::ActOnStartLinkageSpecification(Scope *S, 2126 SourceLocation ExternLoc, 2127 SourceLocation LangLoc, 2128 const char *Lang, 2129 unsigned StrSize, 2130 SourceLocation LBraceLoc) { 2131 LinkageSpecDecl::LanguageIDs Language; 2132 if (strncmp(Lang, "\"C\"", StrSize) == 0) 2133 Language = LinkageSpecDecl::lang_c; 2134 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 2135 Language = LinkageSpecDecl::lang_cxx; 2136 else { 2137 Diag(LangLoc, diag::err_bad_language); 2138 return 0; 2139 } 2140 2141 // FIXME: Add all the various semantics of linkage specifications 2142 2143 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 2144 LangLoc, Language, 2145 LBraceLoc.isValid()); 2146 CurContext->addDecl(D); 2147 PushDeclContext(S, D); 2148 return D; 2149} 2150 2151/// ActOnFinishLinkageSpecification - Completely the definition of 2152/// the C++ linkage specification LinkageSpec. If RBraceLoc is 2153/// valid, it's the position of the closing '}' brace in a linkage 2154/// specification that uses braces. 2155Sema::DeclTy *Sema::ActOnFinishLinkageSpecification(Scope *S, 2156 DeclTy *LinkageSpec, 2157 SourceLocation RBraceLoc) { 2158 if (LinkageSpec) 2159 PopDeclContext(); 2160 return LinkageSpec; 2161} 2162 2163/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 2164/// handler. 2165Sema::DeclTy *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) 2166{ 2167 QualType ExDeclType = GetTypeForDeclarator(D, S); 2168 SourceLocation Begin = D.getDeclSpec().getSourceRange().getBegin(); 2169 2170 bool Invalid = false; 2171 2172 // Arrays and functions decay. 2173 if (ExDeclType->isArrayType()) 2174 ExDeclType = Context.getArrayDecayedType(ExDeclType); 2175 else if (ExDeclType->isFunctionType()) 2176 ExDeclType = Context.getPointerType(ExDeclType); 2177 2178 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 2179 // The exception-declaration shall not denote a pointer or reference to an 2180 // incomplete type, other than [cv] void*. 2181 QualType BaseType = ExDeclType; 2182 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 2183 unsigned DK = diag::err_catch_incomplete; 2184 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 2185 BaseType = Ptr->getPointeeType(); 2186 Mode = 1; 2187 DK = diag::err_catch_incomplete_ptr; 2188 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 2189 BaseType = Ref->getPointeeType(); 2190 Mode = 2; 2191 DK = diag::err_catch_incomplete_ref; 2192 } 2193 if ((Mode == 0 || !BaseType->isVoidType()) && 2194 DiagnoseIncompleteType(Begin, BaseType, DK)) 2195 Invalid = true; 2196 2197 // FIXME: Need to test for ability to copy-construct and destroy the 2198 // exception variable. 2199 // FIXME: Need to check for abstract classes. 2200 2201 IdentifierInfo *II = D.getIdentifier(); 2202 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 2203 // The scope should be freshly made just for us. There is just no way 2204 // it contains any previous declaration. 2205 assert(!S->isDeclScope(PrevDecl)); 2206 if (PrevDecl->isTemplateParameter()) { 2207 // Maybe we will complain about the shadowed template parameter. 2208 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2209 2210 } 2211 } 2212 2213 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, D.getIdentifierLoc(), 2214 II, ExDeclType, VarDecl::None, 0, Begin); 2215 if (D.getInvalidType() || Invalid) 2216 ExDecl->setInvalidDecl(); 2217 2218 if (D.getCXXScopeSpec().isSet()) { 2219 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 2220 << D.getCXXScopeSpec().getRange(); 2221 ExDecl->setInvalidDecl(); 2222 } 2223 2224 // Add the exception declaration into this scope. 2225 S->AddDecl(ExDecl); 2226 if (II) 2227 IdResolver.AddDecl(ExDecl); 2228 2229 ProcessDeclAttributes(ExDecl, D); 2230 return ExDecl; 2231} 2232