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