SemaDeclCXX.cpp revision 206084
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 "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 const CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor���s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor���s 1045 // definition. [Note: if the constructor���s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1080 bool NotUnknownSpecialization = false; 1081 DeclContext *DC = computeDeclContext(SS, false); 1082 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1083 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1084 1085 if (!NotUnknownSpecialization) { 1086 // When the scope specifier can refer to a member of an unknown 1087 // specialization, we take it as a type name. 1088 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1089 *MemberOrBase, SS.getRange()); 1090 if (BaseType.isNull()) 1091 return true; 1092 1093 R.clear(); 1094 } 1095 } 1096 1097 // If no results were found, try to correct typos. 1098 if (R.empty() && BaseType.isNull() && 1099 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1100 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1101 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1102 // We have found a non-static data member with a similar 1103 // name to what was typed; complain and initialize that 1104 // member. 1105 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1106 << MemberOrBase << true << R.getLookupName() 1107 << FixItHint::CreateReplacement(R.getNameLoc(), 1108 R.getLookupName().getAsString()); 1109 Diag(Member->getLocation(), diag::note_previous_decl) 1110 << Member->getDeclName(); 1111 1112 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1113 LParenLoc, RParenLoc); 1114 } 1115 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1116 const CXXBaseSpecifier *DirectBaseSpec; 1117 const CXXBaseSpecifier *VirtualBaseSpec; 1118 if (FindBaseInitializer(*this, ClassDecl, 1119 Context.getTypeDeclType(Type), 1120 DirectBaseSpec, VirtualBaseSpec)) { 1121 // We have found a direct or virtual base class with a 1122 // similar name to what was typed; complain and initialize 1123 // that base class. 1124 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1125 << MemberOrBase << false << R.getLookupName() 1126 << FixItHint::CreateReplacement(R.getNameLoc(), 1127 R.getLookupName().getAsString()); 1128 1129 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1130 : VirtualBaseSpec; 1131 Diag(BaseSpec->getSourceRange().getBegin(), 1132 diag::note_base_class_specified_here) 1133 << BaseSpec->getType() 1134 << BaseSpec->getSourceRange(); 1135 1136 TyD = Type; 1137 } 1138 } 1139 } 1140 1141 if (!TyD && BaseType.isNull()) { 1142 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1143 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1144 return true; 1145 } 1146 } 1147 1148 if (BaseType.isNull()) { 1149 BaseType = Context.getTypeDeclType(TyD); 1150 if (SS.isSet()) { 1151 NestedNameSpecifier *Qualifier = 1152 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1153 1154 // FIXME: preserve source range information 1155 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1156 } 1157 } 1158 } 1159 1160 if (!TInfo) 1161 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1162 1163 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1164 LParenLoc, RParenLoc, ClassDecl); 1165} 1166 1167/// Checks an initializer expression for use of uninitialized fields, such as 1168/// containing the field that is being initialized. Returns true if there is an 1169/// uninitialized field was used an updates the SourceLocation parameter; false 1170/// otherwise. 1171static bool InitExprContainsUninitializedFields(const Stmt* S, 1172 const FieldDecl* LhsField, 1173 SourceLocation* L) { 1174 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1175 if (ME) { 1176 const NamedDecl* RhsField = ME->getMemberDecl(); 1177 if (RhsField == LhsField) { 1178 // Initializing a field with itself. Throw a warning. 1179 // But wait; there are exceptions! 1180 // Exception #1: The field may not belong to this record. 1181 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1182 const Expr* base = ME->getBase(); 1183 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1184 // Even though the field matches, it does not belong to this record. 1185 return false; 1186 } 1187 // None of the exceptions triggered; return true to indicate an 1188 // uninitialized field was used. 1189 *L = ME->getMemberLoc(); 1190 return true; 1191 } 1192 } 1193 bool found = false; 1194 for (Stmt::const_child_iterator it = S->child_begin(); 1195 it != S->child_end() && found == false; 1196 ++it) { 1197 if (isa<CallExpr>(S)) { 1198 // Do not descend into function calls or constructors, as the use 1199 // of an uninitialized field may be valid. One would have to inspect 1200 // the contents of the function/ctor to determine if it is safe or not. 1201 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1202 // may be safe, depending on what the function/ctor does. 1203 continue; 1204 } 1205 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1206 } 1207 return found; 1208} 1209 1210Sema::MemInitResult 1211Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1212 unsigned NumArgs, SourceLocation IdLoc, 1213 SourceLocation LParenLoc, 1214 SourceLocation RParenLoc) { 1215 // Diagnose value-uses of fields to initialize themselves, e.g. 1216 // foo(foo) 1217 // where foo is not also a parameter to the constructor. 1218 // TODO: implement -Wuninitialized and fold this into that framework. 1219 for (unsigned i = 0; i < NumArgs; ++i) { 1220 SourceLocation L; 1221 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1222 // FIXME: Return true in the case when other fields are used before being 1223 // uninitialized. For example, let this field be the i'th field. When 1224 // initializing the i'th field, throw a warning if any of the >= i'th 1225 // fields are used, as they are not yet initialized. 1226 // Right now we are only handling the case where the i'th field uses 1227 // itself in its initializer. 1228 Diag(L, diag::warn_field_is_uninit); 1229 } 1230 } 1231 1232 bool HasDependentArg = false; 1233 for (unsigned i = 0; i < NumArgs; i++) 1234 HasDependentArg |= Args[i]->isTypeDependent(); 1235 1236 QualType FieldType = Member->getType(); 1237 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1238 FieldType = Array->getElementType(); 1239 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1240 if (FieldType->isDependentType() || HasDependentArg) { 1241 // Can't check initialization for a member of dependent type or when 1242 // any of the arguments are type-dependent expressions. 1243 OwningExprResult Init 1244 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1245 RParenLoc)); 1246 1247 // Erase any temporaries within this evaluation context; we're not 1248 // going to track them in the AST, since we'll be rebuilding the 1249 // ASTs during template instantiation. 1250 ExprTemporaries.erase( 1251 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1252 ExprTemporaries.end()); 1253 1254 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1255 LParenLoc, 1256 Init.takeAs<Expr>(), 1257 RParenLoc); 1258 1259 } 1260 1261 if (Member->isInvalidDecl()) 1262 return true; 1263 1264 // Initialize the member. 1265 InitializedEntity MemberEntity = 1266 InitializedEntity::InitializeMember(Member, 0); 1267 InitializationKind Kind = 1268 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1269 1270 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1271 1272 OwningExprResult MemberInit = 1273 InitSeq.Perform(*this, MemberEntity, Kind, 1274 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1275 if (MemberInit.isInvalid()) 1276 return true; 1277 1278 // C++0x [class.base.init]p7: 1279 // The initialization of each base and member constitutes a 1280 // full-expression. 1281 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1282 if (MemberInit.isInvalid()) 1283 return true; 1284 1285 // If we are in a dependent context, template instantiation will 1286 // perform this type-checking again. Just save the arguments that we 1287 // received in a ParenListExpr. 1288 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1289 // of the information that we have about the member 1290 // initializer. However, deconstructing the ASTs is a dicey process, 1291 // and this approach is far more likely to get the corner cases right. 1292 if (CurContext->isDependentContext()) { 1293 // Bump the reference count of all of the arguments. 1294 for (unsigned I = 0; I != NumArgs; ++I) 1295 Args[I]->Retain(); 1296 1297 OwningExprResult Init 1298 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1299 RParenLoc)); 1300 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1301 LParenLoc, 1302 Init.takeAs<Expr>(), 1303 RParenLoc); 1304 } 1305 1306 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1307 LParenLoc, 1308 MemberInit.takeAs<Expr>(), 1309 RParenLoc); 1310} 1311 1312Sema::MemInitResult 1313Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1314 Expr **Args, unsigned NumArgs, 1315 SourceLocation LParenLoc, SourceLocation RParenLoc, 1316 CXXRecordDecl *ClassDecl) { 1317 bool HasDependentArg = false; 1318 for (unsigned i = 0; i < NumArgs; i++) 1319 HasDependentArg |= Args[i]->isTypeDependent(); 1320 1321 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1322 if (BaseType->isDependentType() || HasDependentArg) { 1323 // Can't check initialization for a base of dependent type or when 1324 // any of the arguments are type-dependent expressions. 1325 OwningExprResult BaseInit 1326 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1327 RParenLoc)); 1328 1329 // Erase any temporaries within this evaluation context; we're not 1330 // going to track them in the AST, since we'll be rebuilding the 1331 // ASTs during template instantiation. 1332 ExprTemporaries.erase( 1333 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1334 ExprTemporaries.end()); 1335 1336 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1337 LParenLoc, 1338 BaseInit.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 if (!BaseType->isRecordType()) 1343 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1344 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1345 1346 // C++ [class.base.init]p2: 1347 // [...] Unless the mem-initializer-id names a nonstatic data 1348 // member of the constructor���s class or a direct or virtual base 1349 // of that class, the mem-initializer is ill-formed. A 1350 // mem-initializer-list can initialize a base class using any 1351 // name that denotes that base class type. 1352 1353 // Check for direct and virtual base classes. 1354 const CXXBaseSpecifier *DirectBaseSpec = 0; 1355 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1356 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1357 VirtualBaseSpec); 1358 1359 // C++ [base.class.init]p2: 1360 // If a mem-initializer-id is ambiguous because it designates both 1361 // a direct non-virtual base class and an inherited virtual base 1362 // class, the mem-initializer is ill-formed. 1363 if (DirectBaseSpec && VirtualBaseSpec) 1364 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1365 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1366 // C++ [base.class.init]p2: 1367 // Unless the mem-initializer-id names a nonstatic data membeer of the 1368 // constructor's class ot a direst or virtual base of that class, the 1369 // mem-initializer is ill-formed. 1370 if (!DirectBaseSpec && !VirtualBaseSpec) 1371 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1372 << BaseType << ClassDecl->getNameAsCString() 1373 << BaseTInfo->getTypeLoc().getSourceRange(); 1374 1375 CXXBaseSpecifier *BaseSpec 1376 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1377 if (!BaseSpec) 1378 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1379 1380 // Initialize the base. 1381 InitializedEntity BaseEntity = 1382 InitializedEntity::InitializeBase(Context, BaseSpec); 1383 InitializationKind Kind = 1384 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1385 1386 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1387 1388 OwningExprResult BaseInit = 1389 InitSeq.Perform(*this, BaseEntity, Kind, 1390 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1391 if (BaseInit.isInvalid()) 1392 return true; 1393 1394 // C++0x [class.base.init]p7: 1395 // The initialization of each base and member constitutes a 1396 // full-expression. 1397 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1398 if (BaseInit.isInvalid()) 1399 return true; 1400 1401 // If we are in a dependent context, template instantiation will 1402 // perform this type-checking again. Just save the arguments that we 1403 // received in a ParenListExpr. 1404 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1405 // of the information that we have about the base 1406 // initializer. However, deconstructing the ASTs is a dicey process, 1407 // and this approach is far more likely to get the corner cases right. 1408 if (CurContext->isDependentContext()) { 1409 // Bump the reference count of all of the arguments. 1410 for (unsigned I = 0; I != NumArgs; ++I) 1411 Args[I]->Retain(); 1412 1413 OwningExprResult Init 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1417 LParenLoc, 1418 Init.takeAs<Expr>(), 1419 RParenLoc); 1420 } 1421 1422 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1423 LParenLoc, 1424 BaseInit.takeAs<Expr>(), 1425 RParenLoc); 1426} 1427 1428bool 1429Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1430 CXXBaseOrMemberInitializer **Initializers, 1431 unsigned NumInitializers, 1432 bool AnyErrors) { 1433 if (Constructor->isDependentContext()) { 1434 // Just store the initializers as written, they will be checked during 1435 // instantiation. 1436 if (NumInitializers > 0) { 1437 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1438 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1439 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1440 memcpy(baseOrMemberInitializers, Initializers, 1441 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1442 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1443 } 1444 1445 return false; 1446 } 1447 1448 // We need to build the initializer AST according to order of construction 1449 // and not what user specified in the Initializers list. 1450 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1451 if (!ClassDecl) 1452 return true; 1453 1454 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1455 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1456 bool HadError = false; 1457 1458 for (unsigned i = 0; i < NumInitializers; i++) { 1459 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1460 1461 if (Member->isBaseInitializer()) 1462 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1463 else 1464 AllBaseFields[Member->getMember()] = Member; 1465 } 1466 1467 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1468 1469 // Push virtual bases before others. 1470 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1471 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1472 1473 if (CXXBaseOrMemberInitializer *Value 1474 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1475 AllToInit.push_back(Value); 1476 } else if (!AnyErrors) { 1477 InitializedEntity InitEntity 1478 = InitializedEntity::InitializeBase(Context, VBase); 1479 InitializationKind InitKind 1480 = InitializationKind::CreateDefault(Constructor->getLocation()); 1481 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1482 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1483 MultiExprArg(*this, 0, 0)); 1484 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1485 if (BaseInit.isInvalid()) { 1486 HadError = true; 1487 continue; 1488 } 1489 1490 CXXBaseOrMemberInitializer *CXXBaseInit = 1491 new (Context) CXXBaseOrMemberInitializer(Context, 1492 Context.getTrivialTypeSourceInfo(VBase->getType(), 1493 SourceLocation()), 1494 SourceLocation(), 1495 BaseInit.takeAs<Expr>(), 1496 SourceLocation()); 1497 AllToInit.push_back(CXXBaseInit); 1498 } 1499 } 1500 1501 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1502 E = ClassDecl->bases_end(); Base != E; ++Base) { 1503 // Virtuals are in the virtual base list and already constructed. 1504 if (Base->isVirtual()) 1505 continue; 1506 1507 if (CXXBaseOrMemberInitializer *Value 1508 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1509 AllToInit.push_back(Value); 1510 } else if (!AnyErrors) { 1511 InitializedEntity InitEntity 1512 = InitializedEntity::InitializeBase(Context, Base); 1513 InitializationKind InitKind 1514 = InitializationKind::CreateDefault(Constructor->getLocation()); 1515 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1516 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1517 MultiExprArg(*this, 0, 0)); 1518 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1519 if (BaseInit.isInvalid()) { 1520 HadError = true; 1521 continue; 1522 } 1523 1524 CXXBaseOrMemberInitializer *CXXBaseInit = 1525 new (Context) CXXBaseOrMemberInitializer(Context, 1526 Context.getTrivialTypeSourceInfo(Base->getType(), 1527 SourceLocation()), 1528 SourceLocation(), 1529 BaseInit.takeAs<Expr>(), 1530 SourceLocation()); 1531 AllToInit.push_back(CXXBaseInit); 1532 } 1533 } 1534 1535 // non-static data members. 1536 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1537 E = ClassDecl->field_end(); Field != E; ++Field) { 1538 if ((*Field)->isAnonymousStructOrUnion()) { 1539 if (const RecordType *FieldClassType = 1540 Field->getType()->getAs<RecordType>()) { 1541 CXXRecordDecl *FieldClassDecl 1542 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1543 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1544 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1545 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1546 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1547 // set to the anonymous union data member used in the initializer 1548 // list. 1549 Value->setMember(*Field); 1550 Value->setAnonUnionMember(*FA); 1551 AllToInit.push_back(Value); 1552 break; 1553 } 1554 } 1555 } 1556 continue; 1557 } 1558 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1559 AllToInit.push_back(Value); 1560 continue; 1561 } 1562 1563 if ((*Field)->getType()->isDependentType() || AnyErrors) 1564 continue; 1565 1566 QualType FT = Context.getBaseElementType((*Field)->getType()); 1567 if (FT->getAs<RecordType>()) { 1568 InitializedEntity InitEntity 1569 = InitializedEntity::InitializeMember(*Field); 1570 InitializationKind InitKind 1571 = InitializationKind::CreateDefault(Constructor->getLocation()); 1572 1573 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1574 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1575 MultiExprArg(*this, 0, 0)); 1576 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1577 if (MemberInit.isInvalid()) { 1578 HadError = true; 1579 continue; 1580 } 1581 1582 // Don't attach synthesized member initializers in a dependent 1583 // context; they'll be regenerated a template instantiation 1584 // time. 1585 if (CurContext->isDependentContext()) 1586 continue; 1587 1588 CXXBaseOrMemberInitializer *Member = 1589 new (Context) CXXBaseOrMemberInitializer(Context, 1590 *Field, SourceLocation(), 1591 SourceLocation(), 1592 MemberInit.takeAs<Expr>(), 1593 SourceLocation()); 1594 1595 AllToInit.push_back(Member); 1596 } 1597 else if (FT->isReferenceType()) { 1598 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1599 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1600 << 0 << (*Field)->getDeclName(); 1601 Diag((*Field)->getLocation(), diag::note_declared_at); 1602 HadError = true; 1603 } 1604 else if (FT.isConstQualified()) { 1605 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1606 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1607 << 1 << (*Field)->getDeclName(); 1608 Diag((*Field)->getLocation(), diag::note_declared_at); 1609 HadError = true; 1610 } 1611 } 1612 1613 NumInitializers = AllToInit.size(); 1614 if (NumInitializers > 0) { 1615 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1616 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1617 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1618 memcpy(baseOrMemberInitializers, AllToInit.data(), 1619 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1620 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1621 1622 // Constructors implicitly reference the base and member 1623 // destructors. 1624 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1625 Constructor->getParent()); 1626 } 1627 1628 return HadError; 1629} 1630 1631static void *GetKeyForTopLevelField(FieldDecl *Field) { 1632 // For anonymous unions, use the class declaration as the key. 1633 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1634 if (RT->getDecl()->isAnonymousStructOrUnion()) 1635 return static_cast<void *>(RT->getDecl()); 1636 } 1637 return static_cast<void *>(Field); 1638} 1639 1640static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1641 return Context.getCanonicalType(BaseType).getTypePtr(); 1642} 1643 1644static void *GetKeyForMember(ASTContext &Context, 1645 CXXBaseOrMemberInitializer *Member, 1646 bool MemberMaybeAnon = false) { 1647 if (!Member->isMemberInitializer()) 1648 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1649 1650 // For fields injected into the class via declaration of an anonymous union, 1651 // use its anonymous union class declaration as the unique key. 1652 FieldDecl *Field = Member->getMember(); 1653 1654 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1655 // data member of the class. Data member used in the initializer list is 1656 // in AnonUnionMember field. 1657 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1658 Field = Member->getAnonUnionMember(); 1659 1660 // If the field is a member of an anonymous union, we use record decl of the 1661 // union as the key. 1662 RecordDecl *RD = Field->getParent(); 1663 if (RD->isAnonymousStructOrUnion() && RD->isUnion()) 1664 return static_cast<void *>(RD); 1665 1666 return static_cast<void *>(Field); 1667} 1668 1669static void 1670DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1671 const CXXConstructorDecl *Constructor, 1672 CXXBaseOrMemberInitializer **MemInits, 1673 unsigned NumMemInits) { 1674 if (Constructor->isDependentContext()) 1675 return; 1676 1677 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1678 Diagnostic::Ignored && 1679 SemaRef.Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1680 Diagnostic::Ignored) 1681 return; 1682 1683 // Also issue warning if order of ctor-initializer list does not match order 1684 // of 1) base class declarations and 2) order of non-static data members. 1685 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1686 1687 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1688 1689 // Push virtual bases before others. 1690 for (CXXRecordDecl::base_class_const_iterator VBase = 1691 ClassDecl->vbases_begin(), 1692 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1693 AllBaseOrMembers.push_back(GetKeyForBase(SemaRef.Context, 1694 VBase->getType())); 1695 1696 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1697 E = ClassDecl->bases_end(); Base != E; ++Base) { 1698 // Virtuals are alread in the virtual base list and are constructed 1699 // first. 1700 if (Base->isVirtual()) 1701 continue; 1702 AllBaseOrMembers.push_back(GetKeyForBase(SemaRef.Context, 1703 Base->getType())); 1704 } 1705 1706 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1707 E = ClassDecl->field_end(); Field != E; ++Field) 1708 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1709 1710 int Last = AllBaseOrMembers.size(); 1711 int curIndex = 0; 1712 CXXBaseOrMemberInitializer *PrevMember = 0; 1713 for (unsigned i = 0; i < NumMemInits; i++) { 1714 CXXBaseOrMemberInitializer *Member = MemInits[i]; 1715 void *MemberInCtorList = GetKeyForMember(SemaRef.Context, Member, true); 1716 1717 for (; curIndex < Last; curIndex++) 1718 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1719 break; 1720 if (curIndex == Last) { 1721 assert(PrevMember && "Member not in member list?!"); 1722 // Initializer as specified in ctor-initializer list is out of order. 1723 // Issue a warning diagnostic. 1724 if (PrevMember->isBaseInitializer()) { 1725 // Diagnostics is for an initialized base class. 1726 Type *BaseClass = PrevMember->getBaseClass(); 1727 SemaRef.Diag(PrevMember->getSourceLocation(), 1728 diag::warn_base_initialized) 1729 << QualType(BaseClass, 0); 1730 } else { 1731 FieldDecl *Field = PrevMember->getMember(); 1732 SemaRef.Diag(PrevMember->getSourceLocation(), 1733 diag::warn_field_initialized) 1734 << Field->getNameAsString(); 1735 } 1736 // Also the note! 1737 if (FieldDecl *Field = Member->getMember()) 1738 SemaRef.Diag(Member->getSourceLocation(), 1739 diag::note_fieldorbase_initialized_here) << 0 1740 << Field->getNameAsString(); 1741 else { 1742 Type *BaseClass = Member->getBaseClass(); 1743 SemaRef.Diag(Member->getSourceLocation(), 1744 diag::note_fieldorbase_initialized_here) << 1 1745 << QualType(BaseClass, 0); 1746 } 1747 for (curIndex = 0; curIndex < Last; curIndex++) 1748 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1749 break; 1750 } 1751 PrevMember = Member; 1752 } 1753} 1754 1755/// ActOnMemInitializers - Handle the member initializers for a constructor. 1756void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1757 SourceLocation ColonLoc, 1758 MemInitTy **meminits, unsigned NumMemInits, 1759 bool AnyErrors) { 1760 if (!ConstructorDecl) 1761 return; 1762 1763 AdjustDeclIfTemplate(ConstructorDecl); 1764 1765 CXXConstructorDecl *Constructor 1766 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1767 1768 if (!Constructor) { 1769 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1770 return; 1771 } 1772 1773 CXXBaseOrMemberInitializer **MemInits = 1774 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1775 1776 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1777 bool HadError = false; 1778 for (unsigned i = 0; i < NumMemInits; i++) { 1779 CXXBaseOrMemberInitializer *Member = MemInits[i]; 1780 1781 void *KeyToMember = GetKeyForMember(Context, Member); 1782 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1783 if (!PrevMember) { 1784 PrevMember = Member; 1785 continue; 1786 } 1787 if (FieldDecl *Field = Member->getMember()) 1788 Diag(Member->getSourceLocation(), 1789 diag::error_multiple_mem_initialization) 1790 << Field->getNameAsString() 1791 << Member->getSourceRange(); 1792 else { 1793 Type *BaseClass = Member->getBaseClass(); 1794 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1795 Diag(Member->getSourceLocation(), 1796 diag::error_multiple_base_initialization) 1797 << QualType(BaseClass, 0) 1798 << Member->getSourceRange(); 1799 } 1800 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1801 << 0; 1802 HadError = true; 1803 } 1804 1805 if (HadError) 1806 return; 1807 1808 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1809 1810 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1811} 1812 1813void 1814Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1815 CXXRecordDecl *ClassDecl) { 1816 // Ignore dependent contexts. 1817 if (ClassDecl->isDependentContext()) 1818 return; 1819 1820 // FIXME: all the access-control diagnostics are positioned on the 1821 // field/base declaration. That's probably good; that said, the 1822 // user might reasonably want to know why the destructor is being 1823 // emitted, and we currently don't say. 1824 1825 // Non-static data members. 1826 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1827 E = ClassDecl->field_end(); I != E; ++I) { 1828 FieldDecl *Field = *I; 1829 1830 QualType FieldType = Context.getBaseElementType(Field->getType()); 1831 1832 const RecordType* RT = FieldType->getAs<RecordType>(); 1833 if (!RT) 1834 continue; 1835 1836 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1837 if (FieldClassDecl->hasTrivialDestructor()) 1838 continue; 1839 1840 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1841 CheckDestructorAccess(Field->getLocation(), Dtor, 1842 PDiag(diag::err_access_dtor_field) 1843 << Field->getDeclName() 1844 << FieldType); 1845 1846 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1847 } 1848 1849 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1850 1851 // Bases. 1852 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1853 E = ClassDecl->bases_end(); Base != E; ++Base) { 1854 // Bases are always records in a well-formed non-dependent class. 1855 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1856 1857 // Remember direct virtual bases. 1858 if (Base->isVirtual()) 1859 DirectVirtualBases.insert(RT); 1860 1861 // Ignore trivial destructors. 1862 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1863 if (BaseClassDecl->hasTrivialDestructor()) 1864 continue; 1865 1866 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1867 1868 // FIXME: caret should be on the start of the class name 1869 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1870 PDiag(diag::err_access_dtor_base) 1871 << Base->getType() 1872 << Base->getSourceRange()); 1873 1874 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1875 } 1876 1877 // Virtual bases. 1878 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1879 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1880 1881 // Bases are always records in a well-formed non-dependent class. 1882 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1883 1884 // Ignore direct virtual bases. 1885 if (DirectVirtualBases.count(RT)) 1886 continue; 1887 1888 // Ignore trivial destructors. 1889 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1890 if (BaseClassDecl->hasTrivialDestructor()) 1891 continue; 1892 1893 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1894 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1895 PDiag(diag::err_access_dtor_vbase) 1896 << VBase->getType()); 1897 1898 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1899 } 1900} 1901 1902void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1903 if (!CDtorDecl) 1904 return; 1905 1906 if (CXXConstructorDecl *Constructor 1907 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1908 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 1909} 1910 1911bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1912 unsigned DiagID, AbstractDiagSelID SelID, 1913 const CXXRecordDecl *CurrentRD) { 1914 if (SelID == -1) 1915 return RequireNonAbstractType(Loc, T, 1916 PDiag(DiagID), CurrentRD); 1917 else 1918 return RequireNonAbstractType(Loc, T, 1919 PDiag(DiagID) << SelID, CurrentRD); 1920} 1921 1922bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1923 const PartialDiagnostic &PD, 1924 const CXXRecordDecl *CurrentRD) { 1925 if (!getLangOptions().CPlusPlus) 1926 return false; 1927 1928 if (const ArrayType *AT = Context.getAsArrayType(T)) 1929 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1930 CurrentRD); 1931 1932 if (const PointerType *PT = T->getAs<PointerType>()) { 1933 // Find the innermost pointer type. 1934 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1935 PT = T; 1936 1937 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1938 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1939 } 1940 1941 const RecordType *RT = T->getAs<RecordType>(); 1942 if (!RT) 1943 return false; 1944 1945 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1946 1947 if (CurrentRD && CurrentRD != RD) 1948 return false; 1949 1950 // FIXME: is this reasonable? It matches current behavior, but.... 1951 if (!RD->getDefinition()) 1952 return false; 1953 1954 if (!RD->isAbstract()) 1955 return false; 1956 1957 Diag(Loc, PD) << RD->getDeclName(); 1958 1959 // Check if we've already emitted the list of pure virtual functions for this 1960 // class. 1961 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1962 return true; 1963 1964 CXXFinalOverriderMap FinalOverriders; 1965 RD->getFinalOverriders(FinalOverriders); 1966 1967 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 1968 MEnd = FinalOverriders.end(); 1969 M != MEnd; 1970 ++M) { 1971 for (OverridingMethods::iterator SO = M->second.begin(), 1972 SOEnd = M->second.end(); 1973 SO != SOEnd; ++SO) { 1974 // C++ [class.abstract]p4: 1975 // A class is abstract if it contains or inherits at least one 1976 // pure virtual function for which the final overrider is pure 1977 // virtual. 1978 1979 // 1980 if (SO->second.size() != 1) 1981 continue; 1982 1983 if (!SO->second.front().Method->isPure()) 1984 continue; 1985 1986 Diag(SO->second.front().Method->getLocation(), 1987 diag::note_pure_virtual_function) 1988 << SO->second.front().Method->getDeclName(); 1989 } 1990 } 1991 1992 if (!PureVirtualClassDiagSet) 1993 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1994 PureVirtualClassDiagSet->insert(RD); 1995 1996 return true; 1997} 1998 1999namespace { 2000 class AbstractClassUsageDiagnoser 2001 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2002 Sema &SemaRef; 2003 CXXRecordDecl *AbstractClass; 2004 2005 bool VisitDeclContext(const DeclContext *DC) { 2006 bool Invalid = false; 2007 2008 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2009 E = DC->decls_end(); I != E; ++I) 2010 Invalid |= Visit(*I); 2011 2012 return Invalid; 2013 } 2014 2015 public: 2016 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2017 : SemaRef(SemaRef), AbstractClass(ac) { 2018 Visit(SemaRef.Context.getTranslationUnitDecl()); 2019 } 2020 2021 bool VisitFunctionDecl(const FunctionDecl *FD) { 2022 if (FD->isThisDeclarationADefinition()) { 2023 // No need to do the check if we're in a definition, because it requires 2024 // that the return/param types are complete. 2025 // because that requires 2026 return VisitDeclContext(FD); 2027 } 2028 2029 // Check the return type. 2030 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2031 bool Invalid = 2032 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2033 diag::err_abstract_type_in_decl, 2034 Sema::AbstractReturnType, 2035 AbstractClass); 2036 2037 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2038 E = FD->param_end(); I != E; ++I) { 2039 const ParmVarDecl *VD = *I; 2040 Invalid |= 2041 SemaRef.RequireNonAbstractType(VD->getLocation(), 2042 VD->getOriginalType(), 2043 diag::err_abstract_type_in_decl, 2044 Sema::AbstractParamType, 2045 AbstractClass); 2046 } 2047 2048 return Invalid; 2049 } 2050 2051 bool VisitDecl(const Decl* D) { 2052 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2053 return VisitDeclContext(DC); 2054 2055 return false; 2056 } 2057 }; 2058} 2059 2060/// \brief Perform semantic checks on a class definition that has been 2061/// completing, introducing implicitly-declared members, checking for 2062/// abstract types, etc. 2063void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2064 if (!Record || Record->isInvalidDecl()) 2065 return; 2066 2067 if (!Record->isDependentType()) 2068 AddImplicitlyDeclaredMembersToClass(Record); 2069 2070 if (Record->isInvalidDecl()) 2071 return; 2072 2073 // Set access bits correctly on the directly-declared conversions. 2074 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2075 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2076 Convs->setAccess(I, (*I)->getAccess()); 2077 2078 // Determine whether we need to check for final overriders. We do 2079 // this either when there are virtual base classes (in which case we 2080 // may end up finding multiple final overriders for a given virtual 2081 // function) or any of the base classes is abstract (in which case 2082 // we might detect that this class is abstract). 2083 bool CheckFinalOverriders = false; 2084 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2085 !Record->isDependentType()) { 2086 if (Record->getNumVBases()) 2087 CheckFinalOverriders = true; 2088 else if (!Record->isAbstract()) { 2089 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2090 BEnd = Record->bases_end(); 2091 B != BEnd; ++B) { 2092 CXXRecordDecl *BaseDecl 2093 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2094 if (BaseDecl->isAbstract()) { 2095 CheckFinalOverriders = true; 2096 break; 2097 } 2098 } 2099 } 2100 } 2101 2102 if (CheckFinalOverriders) { 2103 CXXFinalOverriderMap FinalOverriders; 2104 Record->getFinalOverriders(FinalOverriders); 2105 2106 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2107 MEnd = FinalOverriders.end(); 2108 M != MEnd; ++M) { 2109 for (OverridingMethods::iterator SO = M->second.begin(), 2110 SOEnd = M->second.end(); 2111 SO != SOEnd; ++SO) { 2112 assert(SO->second.size() > 0 && 2113 "All virtual functions have overridding virtual functions"); 2114 if (SO->second.size() == 1) { 2115 // C++ [class.abstract]p4: 2116 // A class is abstract if it contains or inherits at least one 2117 // pure virtual function for which the final overrider is pure 2118 // virtual. 2119 if (SO->second.front().Method->isPure()) 2120 Record->setAbstract(true); 2121 continue; 2122 } 2123 2124 // C++ [class.virtual]p2: 2125 // In a derived class, if a virtual member function of a base 2126 // class subobject has more than one final overrider the 2127 // program is ill-formed. 2128 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2129 << (NamedDecl *)M->first << Record; 2130 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2131 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2132 OMEnd = SO->second.end(); 2133 OM != OMEnd; ++OM) 2134 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2135 << (NamedDecl *)M->first << OM->Method->getParent(); 2136 2137 Record->setInvalidDecl(); 2138 } 2139 } 2140 } 2141 2142 if (Record->isAbstract() && !Record->isInvalidDecl()) 2143 (void)AbstractClassUsageDiagnoser(*this, Record); 2144} 2145 2146void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2147 DeclPtrTy TagDecl, 2148 SourceLocation LBrac, 2149 SourceLocation RBrac, 2150 AttributeList *AttrList) { 2151 if (!TagDecl) 2152 return; 2153 2154 AdjustDeclIfTemplate(TagDecl); 2155 2156 ActOnFields(S, RLoc, TagDecl, 2157 (DeclPtrTy*)FieldCollector->getCurFields(), 2158 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2159 2160 CheckCompletedCXXClass( 2161 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2162} 2163 2164/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2165/// special functions, such as the default constructor, copy 2166/// constructor, or destructor, to the given C++ class (C++ 2167/// [special]p1). This routine can only be executed just before the 2168/// definition of the class is complete. 2169void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2170 CanQualType ClassType 2171 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2172 2173 // FIXME: Implicit declarations have exception specifications, which are 2174 // the union of the specifications of the implicitly called functions. 2175 2176 if (!ClassDecl->hasUserDeclaredConstructor()) { 2177 // C++ [class.ctor]p5: 2178 // A default constructor for a class X is a constructor of class X 2179 // that can be called without an argument. If there is no 2180 // user-declared constructor for class X, a default constructor is 2181 // implicitly declared. An implicitly-declared default constructor 2182 // is an inline public member of its class. 2183 DeclarationName Name 2184 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2185 CXXConstructorDecl *DefaultCon = 2186 CXXConstructorDecl::Create(Context, ClassDecl, 2187 ClassDecl->getLocation(), Name, 2188 Context.getFunctionType(Context.VoidTy, 2189 0, 0, false, 0, 2190 /*FIXME*/false, false, 2191 0, 0, 2192 FunctionType::ExtInfo()), 2193 /*TInfo=*/0, 2194 /*isExplicit=*/false, 2195 /*isInline=*/true, 2196 /*isImplicitlyDeclared=*/true); 2197 DefaultCon->setAccess(AS_public); 2198 DefaultCon->setImplicit(); 2199 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2200 ClassDecl->addDecl(DefaultCon); 2201 } 2202 2203 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2204 // C++ [class.copy]p4: 2205 // If the class definition does not explicitly declare a copy 2206 // constructor, one is declared implicitly. 2207 2208 // C++ [class.copy]p5: 2209 // The implicitly-declared copy constructor for a class X will 2210 // have the form 2211 // 2212 // X::X(const X&) 2213 // 2214 // if 2215 bool HasConstCopyConstructor = true; 2216 2217 // -- each direct or virtual base class B of X has a copy 2218 // constructor whose first parameter is of type const B& or 2219 // const volatile B&, and 2220 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2221 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2222 const CXXRecordDecl *BaseClassDecl 2223 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2224 HasConstCopyConstructor 2225 = BaseClassDecl->hasConstCopyConstructor(Context); 2226 } 2227 2228 // -- for all the nonstatic data members of X that are of a 2229 // class type M (or array thereof), each such class type 2230 // has a copy constructor whose first parameter is of type 2231 // const M& or const volatile M&. 2232 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2233 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2234 ++Field) { 2235 QualType FieldType = (*Field)->getType(); 2236 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2237 FieldType = Array->getElementType(); 2238 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2239 const CXXRecordDecl *FieldClassDecl 2240 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2241 HasConstCopyConstructor 2242 = FieldClassDecl->hasConstCopyConstructor(Context); 2243 } 2244 } 2245 2246 // Otherwise, the implicitly declared copy constructor will have 2247 // the form 2248 // 2249 // X::X(X&) 2250 QualType ArgType = ClassType; 2251 if (HasConstCopyConstructor) 2252 ArgType = ArgType.withConst(); 2253 ArgType = Context.getLValueReferenceType(ArgType); 2254 2255 // An implicitly-declared copy constructor is an inline public 2256 // member of its class. 2257 DeclarationName Name 2258 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2259 CXXConstructorDecl *CopyConstructor 2260 = CXXConstructorDecl::Create(Context, ClassDecl, 2261 ClassDecl->getLocation(), Name, 2262 Context.getFunctionType(Context.VoidTy, 2263 &ArgType, 1, 2264 false, 0, 2265 /*FIXME:*/false, 2266 false, 0, 0, 2267 FunctionType::ExtInfo()), 2268 /*TInfo=*/0, 2269 /*isExplicit=*/false, 2270 /*isInline=*/true, 2271 /*isImplicitlyDeclared=*/true); 2272 CopyConstructor->setAccess(AS_public); 2273 CopyConstructor->setImplicit(); 2274 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2275 2276 // Add the parameter to the constructor. 2277 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2278 ClassDecl->getLocation(), 2279 /*IdentifierInfo=*/0, 2280 ArgType, /*TInfo=*/0, 2281 VarDecl::None, 0); 2282 CopyConstructor->setParams(&FromParam, 1); 2283 ClassDecl->addDecl(CopyConstructor); 2284 } 2285 2286 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2287 // Note: The following rules are largely analoguous to the copy 2288 // constructor rules. Note that virtual bases are not taken into account 2289 // for determining the argument type of the operator. Note also that 2290 // operators taking an object instead of a reference are allowed. 2291 // 2292 // C++ [class.copy]p10: 2293 // If the class definition does not explicitly declare a copy 2294 // assignment operator, one is declared implicitly. 2295 // The implicitly-defined copy assignment operator for a class X 2296 // will have the form 2297 // 2298 // X& X::operator=(const X&) 2299 // 2300 // if 2301 bool HasConstCopyAssignment = true; 2302 2303 // -- each direct base class B of X has a copy assignment operator 2304 // whose parameter is of type const B&, const volatile B& or B, 2305 // and 2306 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2307 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2308 assert(!Base->getType()->isDependentType() && 2309 "Cannot generate implicit members for class with dependent bases."); 2310 const CXXRecordDecl *BaseClassDecl 2311 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2312 const CXXMethodDecl *MD = 0; 2313 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2314 MD); 2315 } 2316 2317 // -- for all the nonstatic data members of X that are of a class 2318 // type M (or array thereof), each such class type has a copy 2319 // assignment operator whose parameter is of type const M&, 2320 // const volatile M& or M. 2321 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2322 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2323 ++Field) { 2324 QualType FieldType = (*Field)->getType(); 2325 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2326 FieldType = Array->getElementType(); 2327 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2328 const CXXRecordDecl *FieldClassDecl 2329 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2330 const CXXMethodDecl *MD = 0; 2331 HasConstCopyAssignment 2332 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2333 } 2334 } 2335 2336 // Otherwise, the implicitly declared copy assignment operator will 2337 // have the form 2338 // 2339 // X& X::operator=(X&) 2340 QualType ArgType = ClassType; 2341 QualType RetType = Context.getLValueReferenceType(ArgType); 2342 if (HasConstCopyAssignment) 2343 ArgType = ArgType.withConst(); 2344 ArgType = Context.getLValueReferenceType(ArgType); 2345 2346 // An implicitly-declared copy assignment operator is an inline public 2347 // member of its class. 2348 DeclarationName Name = 2349 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2350 CXXMethodDecl *CopyAssignment = 2351 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2352 Context.getFunctionType(RetType, &ArgType, 1, 2353 false, 0, 2354 /*FIXME:*/false, 2355 false, 0, 0, 2356 FunctionType::ExtInfo()), 2357 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2358 CopyAssignment->setAccess(AS_public); 2359 CopyAssignment->setImplicit(); 2360 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2361 CopyAssignment->setCopyAssignment(true); 2362 2363 // Add the parameter to the operator. 2364 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2365 ClassDecl->getLocation(), 2366 /*IdentifierInfo=*/0, 2367 ArgType, /*TInfo=*/0, 2368 VarDecl::None, 0); 2369 CopyAssignment->setParams(&FromParam, 1); 2370 2371 // Don't call addedAssignmentOperator. There is no way to distinguish an 2372 // implicit from an explicit assignment operator. 2373 ClassDecl->addDecl(CopyAssignment); 2374 AddOverriddenMethods(ClassDecl, CopyAssignment); 2375 } 2376 2377 if (!ClassDecl->hasUserDeclaredDestructor()) { 2378 // C++ [class.dtor]p2: 2379 // If a class has no user-declared destructor, a destructor is 2380 // declared implicitly. An implicitly-declared destructor is an 2381 // inline public member of its class. 2382 QualType Ty = Context.getFunctionType(Context.VoidTy, 2383 0, 0, false, 0, 2384 /*FIXME:*/false, 2385 false, 0, 0, FunctionType::ExtInfo()); 2386 2387 DeclarationName Name 2388 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2389 CXXDestructorDecl *Destructor 2390 = CXXDestructorDecl::Create(Context, ClassDecl, 2391 ClassDecl->getLocation(), Name, Ty, 2392 /*isInline=*/true, 2393 /*isImplicitlyDeclared=*/true); 2394 Destructor->setAccess(AS_public); 2395 Destructor->setImplicit(); 2396 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2397 ClassDecl->addDecl(Destructor); 2398 2399 // This could be uniqued if it ever proves significant. 2400 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2401 2402 AddOverriddenMethods(ClassDecl, Destructor); 2403 } 2404} 2405 2406void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2407 Decl *D = TemplateD.getAs<Decl>(); 2408 if (!D) 2409 return; 2410 2411 TemplateParameterList *Params = 0; 2412 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2413 Params = Template->getTemplateParameters(); 2414 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2415 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2416 Params = PartialSpec->getTemplateParameters(); 2417 else 2418 return; 2419 2420 for (TemplateParameterList::iterator Param = Params->begin(), 2421 ParamEnd = Params->end(); 2422 Param != ParamEnd; ++Param) { 2423 NamedDecl *Named = cast<NamedDecl>(*Param); 2424 if (Named->getDeclName()) { 2425 S->AddDecl(DeclPtrTy::make(Named)); 2426 IdResolver.AddDecl(Named); 2427 } 2428 } 2429} 2430 2431void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2432 if (!RecordD) return; 2433 AdjustDeclIfTemplate(RecordD); 2434 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2435 PushDeclContext(S, Record); 2436} 2437 2438void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2439 if (!RecordD) return; 2440 PopDeclContext(); 2441} 2442 2443/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2444/// parsing a top-level (non-nested) C++ class, and we are now 2445/// parsing those parts of the given Method declaration that could 2446/// not be parsed earlier (C++ [class.mem]p2), such as default 2447/// arguments. This action should enter the scope of the given 2448/// Method declaration as if we had just parsed the qualified method 2449/// name. However, it should not bring the parameters into scope; 2450/// that will be performed by ActOnDelayedCXXMethodParameter. 2451void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2452} 2453 2454/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2455/// C++ method declaration. We're (re-)introducing the given 2456/// function parameter into scope for use in parsing later parts of 2457/// the method declaration. For example, we could see an 2458/// ActOnParamDefaultArgument event for this parameter. 2459void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2460 if (!ParamD) 2461 return; 2462 2463 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2464 2465 // If this parameter has an unparsed default argument, clear it out 2466 // to make way for the parsed default argument. 2467 if (Param->hasUnparsedDefaultArg()) 2468 Param->setDefaultArg(0); 2469 2470 S->AddDecl(DeclPtrTy::make(Param)); 2471 if (Param->getDeclName()) 2472 IdResolver.AddDecl(Param); 2473} 2474 2475/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2476/// processing the delayed method declaration for Method. The method 2477/// declaration is now considered finished. There may be a separate 2478/// ActOnStartOfFunctionDef action later (not necessarily 2479/// immediately!) for this method, if it was also defined inside the 2480/// class body. 2481void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2482 if (!MethodD) 2483 return; 2484 2485 AdjustDeclIfTemplate(MethodD); 2486 2487 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2488 2489 // Now that we have our default arguments, check the constructor 2490 // again. It could produce additional diagnostics or affect whether 2491 // the class has implicitly-declared destructors, among other 2492 // things. 2493 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2494 CheckConstructor(Constructor); 2495 2496 // Check the default arguments, which we may have added. 2497 if (!Method->isInvalidDecl()) 2498 CheckCXXDefaultArguments(Method); 2499} 2500 2501/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2502/// the well-formedness of the constructor declarator @p D with type @p 2503/// R. If there are any errors in the declarator, this routine will 2504/// emit diagnostics and set the invalid bit to true. In any case, the type 2505/// will be updated to reflect a well-formed type for the constructor and 2506/// returned. 2507QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2508 FunctionDecl::StorageClass &SC) { 2509 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2510 2511 // C++ [class.ctor]p3: 2512 // A constructor shall not be virtual (10.3) or static (9.4). A 2513 // constructor can be invoked for a const, volatile or const 2514 // volatile object. A constructor shall not be declared const, 2515 // volatile, or const volatile (9.3.2). 2516 if (isVirtual) { 2517 if (!D.isInvalidType()) 2518 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2519 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2520 << SourceRange(D.getIdentifierLoc()); 2521 D.setInvalidType(); 2522 } 2523 if (SC == FunctionDecl::Static) { 2524 if (!D.isInvalidType()) 2525 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2526 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2527 << SourceRange(D.getIdentifierLoc()); 2528 D.setInvalidType(); 2529 SC = FunctionDecl::None; 2530 } 2531 2532 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2533 if (FTI.TypeQuals != 0) { 2534 if (FTI.TypeQuals & Qualifiers::Const) 2535 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2536 << "const" << SourceRange(D.getIdentifierLoc()); 2537 if (FTI.TypeQuals & Qualifiers::Volatile) 2538 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2539 << "volatile" << SourceRange(D.getIdentifierLoc()); 2540 if (FTI.TypeQuals & Qualifiers::Restrict) 2541 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2542 << "restrict" << SourceRange(D.getIdentifierLoc()); 2543 } 2544 2545 // Rebuild the function type "R" without any type qualifiers (in 2546 // case any of the errors above fired) and with "void" as the 2547 // return type, since constructors don't have return types. We 2548 // *always* have to do this, because GetTypeForDeclarator will 2549 // put in a result type of "int" when none was specified. 2550 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2551 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2552 Proto->getNumArgs(), 2553 Proto->isVariadic(), 0, 2554 Proto->hasExceptionSpec(), 2555 Proto->hasAnyExceptionSpec(), 2556 Proto->getNumExceptions(), 2557 Proto->exception_begin(), 2558 Proto->getExtInfo()); 2559} 2560 2561/// CheckConstructor - Checks a fully-formed constructor for 2562/// well-formedness, issuing any diagnostics required. Returns true if 2563/// the constructor declarator is invalid. 2564void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2565 CXXRecordDecl *ClassDecl 2566 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2567 if (!ClassDecl) 2568 return Constructor->setInvalidDecl(); 2569 2570 // C++ [class.copy]p3: 2571 // A declaration of a constructor for a class X is ill-formed if 2572 // its first parameter is of type (optionally cv-qualified) X and 2573 // either there are no other parameters or else all other 2574 // parameters have default arguments. 2575 if (!Constructor->isInvalidDecl() && 2576 ((Constructor->getNumParams() == 1) || 2577 (Constructor->getNumParams() > 1 && 2578 Constructor->getParamDecl(1)->hasDefaultArg())) && 2579 Constructor->getTemplateSpecializationKind() 2580 != TSK_ImplicitInstantiation) { 2581 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2582 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2583 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2584 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2585 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2586 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2587 2588 // FIXME: Rather that making the constructor invalid, we should endeavor 2589 // to fix the type. 2590 Constructor->setInvalidDecl(); 2591 } 2592 } 2593 2594 // Notify the class that we've added a constructor. 2595 ClassDecl->addedConstructor(Context, Constructor); 2596} 2597 2598/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2599/// issuing any diagnostics required. Returns true on error. 2600bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2601 CXXRecordDecl *RD = Destructor->getParent(); 2602 2603 if (Destructor->isVirtual()) { 2604 SourceLocation Loc; 2605 2606 if (!Destructor->isImplicit()) 2607 Loc = Destructor->getLocation(); 2608 else 2609 Loc = RD->getLocation(); 2610 2611 // If we have a virtual destructor, look up the deallocation function 2612 FunctionDecl *OperatorDelete = 0; 2613 DeclarationName Name = 2614 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2615 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2616 return true; 2617 2618 Destructor->setOperatorDelete(OperatorDelete); 2619 } 2620 2621 return false; 2622} 2623 2624static inline bool 2625FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2626 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2627 FTI.ArgInfo[0].Param && 2628 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2629} 2630 2631/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2632/// the well-formednes of the destructor declarator @p D with type @p 2633/// R. If there are any errors in the declarator, this routine will 2634/// emit diagnostics and set the declarator to invalid. Even if this happens, 2635/// will be updated to reflect a well-formed type for the destructor and 2636/// returned. 2637QualType Sema::CheckDestructorDeclarator(Declarator &D, 2638 FunctionDecl::StorageClass& SC) { 2639 // C++ [class.dtor]p1: 2640 // [...] A typedef-name that names a class is a class-name 2641 // (7.1.3); however, a typedef-name that names a class shall not 2642 // be used as the identifier in the declarator for a destructor 2643 // declaration. 2644 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2645 if (isa<TypedefType>(DeclaratorType)) { 2646 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2647 << DeclaratorType; 2648 D.setInvalidType(); 2649 } 2650 2651 // C++ [class.dtor]p2: 2652 // A destructor is used to destroy objects of its class type. A 2653 // destructor takes no parameters, and no return type can be 2654 // specified for it (not even void). The address of a destructor 2655 // shall not be taken. A destructor shall not be static. A 2656 // destructor can be invoked for a const, volatile or const 2657 // volatile object. A destructor shall not be declared const, 2658 // volatile or const volatile (9.3.2). 2659 if (SC == FunctionDecl::Static) { 2660 if (!D.isInvalidType()) 2661 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2662 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2663 << SourceRange(D.getIdentifierLoc()); 2664 SC = FunctionDecl::None; 2665 D.setInvalidType(); 2666 } 2667 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2668 // Destructors don't have return types, but the parser will 2669 // happily parse something like: 2670 // 2671 // class X { 2672 // float ~X(); 2673 // }; 2674 // 2675 // The return type will be eliminated later. 2676 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2677 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2678 << SourceRange(D.getIdentifierLoc()); 2679 } 2680 2681 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2682 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2683 if (FTI.TypeQuals & Qualifiers::Const) 2684 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2685 << "const" << SourceRange(D.getIdentifierLoc()); 2686 if (FTI.TypeQuals & Qualifiers::Volatile) 2687 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2688 << "volatile" << SourceRange(D.getIdentifierLoc()); 2689 if (FTI.TypeQuals & Qualifiers::Restrict) 2690 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2691 << "restrict" << SourceRange(D.getIdentifierLoc()); 2692 D.setInvalidType(); 2693 } 2694 2695 // Make sure we don't have any parameters. 2696 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2697 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2698 2699 // Delete the parameters. 2700 FTI.freeArgs(); 2701 D.setInvalidType(); 2702 } 2703 2704 // Make sure the destructor isn't variadic. 2705 if (FTI.isVariadic) { 2706 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2707 D.setInvalidType(); 2708 } 2709 2710 // Rebuild the function type "R" without any type qualifiers or 2711 // parameters (in case any of the errors above fired) and with 2712 // "void" as the return type, since destructors don't have return 2713 // types. We *always* have to do this, because GetTypeForDeclarator 2714 // will put in a result type of "int" when none was specified. 2715 // FIXME: Exceptions! 2716 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2717 false, false, 0, 0, FunctionType::ExtInfo()); 2718} 2719 2720/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2721/// well-formednes of the conversion function declarator @p D with 2722/// type @p R. If there are any errors in the declarator, this routine 2723/// will emit diagnostics and return true. Otherwise, it will return 2724/// false. Either way, the type @p R will be updated to reflect a 2725/// well-formed type for the conversion operator. 2726void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2727 FunctionDecl::StorageClass& SC) { 2728 // C++ [class.conv.fct]p1: 2729 // Neither parameter types nor return type can be specified. The 2730 // type of a conversion function (8.3.5) is "function taking no 2731 // parameter returning conversion-type-id." 2732 if (SC == FunctionDecl::Static) { 2733 if (!D.isInvalidType()) 2734 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2735 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2736 << SourceRange(D.getIdentifierLoc()); 2737 D.setInvalidType(); 2738 SC = FunctionDecl::None; 2739 } 2740 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2741 // Conversion functions don't have return types, but the parser will 2742 // happily parse something like: 2743 // 2744 // class X { 2745 // float operator bool(); 2746 // }; 2747 // 2748 // The return type will be changed later anyway. 2749 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2750 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2751 << SourceRange(D.getIdentifierLoc()); 2752 } 2753 2754 // Make sure we don't have any parameters. 2755 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2756 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2757 2758 // Delete the parameters. 2759 D.getTypeObject(0).Fun.freeArgs(); 2760 D.setInvalidType(); 2761 } 2762 2763 // Make sure the conversion function isn't variadic. 2764 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2765 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2766 D.setInvalidType(); 2767 } 2768 2769 // C++ [class.conv.fct]p4: 2770 // The conversion-type-id shall not represent a function type nor 2771 // an array type. 2772 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2773 if (ConvType->isArrayType()) { 2774 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2775 ConvType = Context.getPointerType(ConvType); 2776 D.setInvalidType(); 2777 } else if (ConvType->isFunctionType()) { 2778 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2779 ConvType = Context.getPointerType(ConvType); 2780 D.setInvalidType(); 2781 } 2782 2783 // Rebuild the function type "R" without any parameters (in case any 2784 // of the errors above fired) and with the conversion type as the 2785 // return type. 2786 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2787 R = Context.getFunctionType(ConvType, 0, 0, false, 2788 Proto->getTypeQuals(), 2789 Proto->hasExceptionSpec(), 2790 Proto->hasAnyExceptionSpec(), 2791 Proto->getNumExceptions(), 2792 Proto->exception_begin(), 2793 Proto->getExtInfo()); 2794 2795 // C++0x explicit conversion operators. 2796 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2797 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2798 diag::warn_explicit_conversion_functions) 2799 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2800} 2801 2802/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2803/// the declaration of the given C++ conversion function. This routine 2804/// is responsible for recording the conversion function in the C++ 2805/// class, if possible. 2806Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2807 assert(Conversion && "Expected to receive a conversion function declaration"); 2808 2809 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2810 2811 // Make sure we aren't redeclaring the conversion function. 2812 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2813 2814 // C++ [class.conv.fct]p1: 2815 // [...] A conversion function is never used to convert a 2816 // (possibly cv-qualified) object to the (possibly cv-qualified) 2817 // same object type (or a reference to it), to a (possibly 2818 // cv-qualified) base class of that type (or a reference to it), 2819 // or to (possibly cv-qualified) void. 2820 // FIXME: Suppress this warning if the conversion function ends up being a 2821 // virtual function that overrides a virtual function in a base class. 2822 QualType ClassType 2823 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2824 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2825 ConvType = ConvTypeRef->getPointeeType(); 2826 if (ConvType->isRecordType()) { 2827 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2828 if (ConvType == ClassType) 2829 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2830 << ClassType; 2831 else if (IsDerivedFrom(ClassType, ConvType)) 2832 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2833 << ClassType << ConvType; 2834 } else if (ConvType->isVoidType()) { 2835 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2836 << ClassType << ConvType; 2837 } 2838 2839 if (Conversion->getPrimaryTemplate()) { 2840 // ignore specializations 2841 } else if (Conversion->getPreviousDeclaration()) { 2842 if (FunctionTemplateDecl *ConversionTemplate 2843 = Conversion->getDescribedFunctionTemplate()) { 2844 if (ClassDecl->replaceConversion( 2845 ConversionTemplate->getPreviousDeclaration(), 2846 ConversionTemplate)) 2847 return DeclPtrTy::make(ConversionTemplate); 2848 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2849 Conversion)) 2850 return DeclPtrTy::make(Conversion); 2851 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2852 } else if (FunctionTemplateDecl *ConversionTemplate 2853 = Conversion->getDescribedFunctionTemplate()) 2854 ClassDecl->addConversionFunction(ConversionTemplate); 2855 else 2856 ClassDecl->addConversionFunction(Conversion); 2857 2858 return DeclPtrTy::make(Conversion); 2859} 2860 2861//===----------------------------------------------------------------------===// 2862// Namespace Handling 2863//===----------------------------------------------------------------------===// 2864 2865/// ActOnStartNamespaceDef - This is called at the start of a namespace 2866/// definition. 2867Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2868 SourceLocation IdentLoc, 2869 IdentifierInfo *II, 2870 SourceLocation LBrace, 2871 AttributeList *AttrList) { 2872 NamespaceDecl *Namespc = 2873 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2874 Namespc->setLBracLoc(LBrace); 2875 2876 Scope *DeclRegionScope = NamespcScope->getParent(); 2877 2878 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2879 2880 if (II) { 2881 // C++ [namespace.def]p2: 2882 // The identifier in an original-namespace-definition shall not have been 2883 // previously defined in the declarative region in which the 2884 // original-namespace-definition appears. The identifier in an 2885 // original-namespace-definition is the name of the namespace. Subsequently 2886 // in that declarative region, it is treated as an original-namespace-name. 2887 2888 NamedDecl *PrevDecl 2889 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2890 ForRedeclaration); 2891 2892 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2893 // This is an extended namespace definition. 2894 // Attach this namespace decl to the chain of extended namespace 2895 // definitions. 2896 OrigNS->setNextNamespace(Namespc); 2897 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2898 2899 // Remove the previous declaration from the scope. 2900 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2901 IdResolver.RemoveDecl(OrigNS); 2902 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2903 } 2904 } else if (PrevDecl) { 2905 // This is an invalid name redefinition. 2906 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2907 << Namespc->getDeclName(); 2908 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2909 Namespc->setInvalidDecl(); 2910 // Continue on to push Namespc as current DeclContext and return it. 2911 } else if (II->isStr("std") && 2912 CurContext->getLookupContext()->isTranslationUnit()) { 2913 // This is the first "real" definition of the namespace "std", so update 2914 // our cache of the "std" namespace to point at this definition. 2915 if (StdNamespace) { 2916 // We had already defined a dummy namespace "std". Link this new 2917 // namespace definition to the dummy namespace "std". 2918 StdNamespace->setNextNamespace(Namespc); 2919 StdNamespace->setLocation(IdentLoc); 2920 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2921 } 2922 2923 // Make our StdNamespace cache point at the first real definition of the 2924 // "std" namespace. 2925 StdNamespace = Namespc; 2926 } 2927 2928 PushOnScopeChains(Namespc, DeclRegionScope); 2929 } else { 2930 // Anonymous namespaces. 2931 assert(Namespc->isAnonymousNamespace()); 2932 2933 // Link the anonymous namespace into its parent. 2934 NamespaceDecl *PrevDecl; 2935 DeclContext *Parent = CurContext->getLookupContext(); 2936 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2937 PrevDecl = TU->getAnonymousNamespace(); 2938 TU->setAnonymousNamespace(Namespc); 2939 } else { 2940 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2941 PrevDecl = ND->getAnonymousNamespace(); 2942 ND->setAnonymousNamespace(Namespc); 2943 } 2944 2945 // Link the anonymous namespace with its previous declaration. 2946 if (PrevDecl) { 2947 assert(PrevDecl->isAnonymousNamespace()); 2948 assert(!PrevDecl->getNextNamespace()); 2949 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2950 PrevDecl->setNextNamespace(Namespc); 2951 } 2952 2953 CurContext->addDecl(Namespc); 2954 2955 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2956 // behaves as if it were replaced by 2957 // namespace unique { /* empty body */ } 2958 // using namespace unique; 2959 // namespace unique { namespace-body } 2960 // where all occurrences of 'unique' in a translation unit are 2961 // replaced by the same identifier and this identifier differs 2962 // from all other identifiers in the entire program. 2963 2964 // We just create the namespace with an empty name and then add an 2965 // implicit using declaration, just like the standard suggests. 2966 // 2967 // CodeGen enforces the "universally unique" aspect by giving all 2968 // declarations semantically contained within an anonymous 2969 // namespace internal linkage. 2970 2971 if (!PrevDecl) { 2972 UsingDirectiveDecl* UD 2973 = UsingDirectiveDecl::Create(Context, CurContext, 2974 /* 'using' */ LBrace, 2975 /* 'namespace' */ SourceLocation(), 2976 /* qualifier */ SourceRange(), 2977 /* NNS */ NULL, 2978 /* identifier */ SourceLocation(), 2979 Namespc, 2980 /* Ancestor */ CurContext); 2981 UD->setImplicit(); 2982 CurContext->addDecl(UD); 2983 } 2984 } 2985 2986 // Although we could have an invalid decl (i.e. the namespace name is a 2987 // redefinition), push it as current DeclContext and try to continue parsing. 2988 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2989 // for the namespace has the declarations that showed up in that particular 2990 // namespace definition. 2991 PushDeclContext(NamespcScope, Namespc); 2992 return DeclPtrTy::make(Namespc); 2993} 2994 2995/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2996/// is a namespace alias, returns the namespace it points to. 2997static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2998 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2999 return AD->getNamespace(); 3000 return dyn_cast_or_null<NamespaceDecl>(D); 3001} 3002 3003/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3004/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3005void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3006 Decl *Dcl = D.getAs<Decl>(); 3007 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3008 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3009 Namespc->setRBracLoc(RBrace); 3010 PopDeclContext(); 3011} 3012 3013Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3014 SourceLocation UsingLoc, 3015 SourceLocation NamespcLoc, 3016 const CXXScopeSpec &SS, 3017 SourceLocation IdentLoc, 3018 IdentifierInfo *NamespcName, 3019 AttributeList *AttrList) { 3020 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3021 assert(NamespcName && "Invalid NamespcName."); 3022 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3023 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3024 3025 UsingDirectiveDecl *UDir = 0; 3026 3027 // Lookup namespace name. 3028 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3029 LookupParsedName(R, S, &SS); 3030 if (R.isAmbiguous()) 3031 return DeclPtrTy(); 3032 3033 if (!R.empty()) { 3034 NamedDecl *Named = R.getFoundDecl(); 3035 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3036 && "expected namespace decl"); 3037 // C++ [namespace.udir]p1: 3038 // A using-directive specifies that the names in the nominated 3039 // namespace can be used in the scope in which the 3040 // using-directive appears after the using-directive. During 3041 // unqualified name lookup (3.4.1), the names appear as if they 3042 // were declared in the nearest enclosing namespace which 3043 // contains both the using-directive and the nominated 3044 // namespace. [Note: in this context, "contains" means "contains 3045 // directly or indirectly". ] 3046 3047 // Find enclosing context containing both using-directive and 3048 // nominated namespace. 3049 NamespaceDecl *NS = getNamespaceDecl(Named); 3050 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3051 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3052 CommonAncestor = CommonAncestor->getParent(); 3053 3054 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3055 SS.getRange(), 3056 (NestedNameSpecifier *)SS.getScopeRep(), 3057 IdentLoc, Named, CommonAncestor); 3058 PushUsingDirective(S, UDir); 3059 } else { 3060 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3061 } 3062 3063 // FIXME: We ignore attributes for now. 3064 delete AttrList; 3065 return DeclPtrTy::make(UDir); 3066} 3067 3068void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3069 // If scope has associated entity, then using directive is at namespace 3070 // or translation unit scope. We add UsingDirectiveDecls, into 3071 // it's lookup structure. 3072 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3073 Ctx->addDecl(UDir); 3074 else 3075 // Otherwise it is block-sope. using-directives will affect lookup 3076 // only to the end of scope. 3077 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3078} 3079 3080 3081Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3082 AccessSpecifier AS, 3083 bool HasUsingKeyword, 3084 SourceLocation UsingLoc, 3085 const CXXScopeSpec &SS, 3086 UnqualifiedId &Name, 3087 AttributeList *AttrList, 3088 bool IsTypeName, 3089 SourceLocation TypenameLoc) { 3090 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3091 3092 switch (Name.getKind()) { 3093 case UnqualifiedId::IK_Identifier: 3094 case UnqualifiedId::IK_OperatorFunctionId: 3095 case UnqualifiedId::IK_LiteralOperatorId: 3096 case UnqualifiedId::IK_ConversionFunctionId: 3097 break; 3098 3099 case UnqualifiedId::IK_ConstructorName: 3100 case UnqualifiedId::IK_ConstructorTemplateId: 3101 // C++0x inherited constructors. 3102 if (getLangOptions().CPlusPlus0x) break; 3103 3104 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3105 << SS.getRange(); 3106 return DeclPtrTy(); 3107 3108 case UnqualifiedId::IK_DestructorName: 3109 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3110 << SS.getRange(); 3111 return DeclPtrTy(); 3112 3113 case UnqualifiedId::IK_TemplateId: 3114 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3115 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3116 return DeclPtrTy(); 3117 } 3118 3119 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3120 if (!TargetName) 3121 return DeclPtrTy(); 3122 3123 // Warn about using declarations. 3124 // TODO: store that the declaration was written without 'using' and 3125 // talk about access decls instead of using decls in the 3126 // diagnostics. 3127 if (!HasUsingKeyword) { 3128 UsingLoc = Name.getSourceRange().getBegin(); 3129 3130 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3131 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3132 } 3133 3134 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3135 Name.getSourceRange().getBegin(), 3136 TargetName, AttrList, 3137 /* IsInstantiation */ false, 3138 IsTypeName, TypenameLoc); 3139 if (UD) 3140 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3141 3142 return DeclPtrTy::make(UD); 3143} 3144 3145/// Determines whether to create a using shadow decl for a particular 3146/// decl, given the set of decls existing prior to this using lookup. 3147bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3148 const LookupResult &Previous) { 3149 // Diagnose finding a decl which is not from a base class of the 3150 // current class. We do this now because there are cases where this 3151 // function will silently decide not to build a shadow decl, which 3152 // will pre-empt further diagnostics. 3153 // 3154 // We don't need to do this in C++0x because we do the check once on 3155 // the qualifier. 3156 // 3157 // FIXME: diagnose the following if we care enough: 3158 // struct A { int foo; }; 3159 // struct B : A { using A::foo; }; 3160 // template <class T> struct C : A {}; 3161 // template <class T> struct D : C<T> { using B::foo; } // <--- 3162 // This is invalid (during instantiation) in C++03 because B::foo 3163 // resolves to the using decl in B, which is not a base class of D<T>. 3164 // We can't diagnose it immediately because C<T> is an unknown 3165 // specialization. The UsingShadowDecl in D<T> then points directly 3166 // to A::foo, which will look well-formed when we instantiate. 3167 // The right solution is to not collapse the shadow-decl chain. 3168 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3169 DeclContext *OrigDC = Orig->getDeclContext(); 3170 3171 // Handle enums and anonymous structs. 3172 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3173 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3174 while (OrigRec->isAnonymousStructOrUnion()) 3175 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3176 3177 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3178 if (OrigDC == CurContext) { 3179 Diag(Using->getLocation(), 3180 diag::err_using_decl_nested_name_specifier_is_current_class) 3181 << Using->getNestedNameRange(); 3182 Diag(Orig->getLocation(), diag::note_using_decl_target); 3183 return true; 3184 } 3185 3186 Diag(Using->getNestedNameRange().getBegin(), 3187 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3188 << Using->getTargetNestedNameDecl() 3189 << cast<CXXRecordDecl>(CurContext) 3190 << Using->getNestedNameRange(); 3191 Diag(Orig->getLocation(), diag::note_using_decl_target); 3192 return true; 3193 } 3194 } 3195 3196 if (Previous.empty()) return false; 3197 3198 NamedDecl *Target = Orig; 3199 if (isa<UsingShadowDecl>(Target)) 3200 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3201 3202 // If the target happens to be one of the previous declarations, we 3203 // don't have a conflict. 3204 // 3205 // FIXME: but we might be increasing its access, in which case we 3206 // should redeclare it. 3207 NamedDecl *NonTag = 0, *Tag = 0; 3208 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3209 I != E; ++I) { 3210 NamedDecl *D = (*I)->getUnderlyingDecl(); 3211 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3212 return false; 3213 3214 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3215 } 3216 3217 if (Target->isFunctionOrFunctionTemplate()) { 3218 FunctionDecl *FD; 3219 if (isa<FunctionTemplateDecl>(Target)) 3220 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3221 else 3222 FD = cast<FunctionDecl>(Target); 3223 3224 NamedDecl *OldDecl = 0; 3225 switch (CheckOverload(FD, Previous, OldDecl)) { 3226 case Ovl_Overload: 3227 return false; 3228 3229 case Ovl_NonFunction: 3230 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3231 break; 3232 3233 // We found a decl with the exact signature. 3234 case Ovl_Match: 3235 if (isa<UsingShadowDecl>(OldDecl)) { 3236 // Silently ignore the possible conflict. 3237 return false; 3238 } 3239 3240 // If we're in a record, we want to hide the target, so we 3241 // return true (without a diagnostic) to tell the caller not to 3242 // build a shadow decl. 3243 if (CurContext->isRecord()) 3244 return true; 3245 3246 // If we're not in a record, this is an error. 3247 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3248 break; 3249 } 3250 3251 Diag(Target->getLocation(), diag::note_using_decl_target); 3252 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3253 return true; 3254 } 3255 3256 // Target is not a function. 3257 3258 if (isa<TagDecl>(Target)) { 3259 // No conflict between a tag and a non-tag. 3260 if (!Tag) return false; 3261 3262 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3263 Diag(Target->getLocation(), diag::note_using_decl_target); 3264 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3265 return true; 3266 } 3267 3268 // No conflict between a tag and a non-tag. 3269 if (!NonTag) return false; 3270 3271 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3272 Diag(Target->getLocation(), diag::note_using_decl_target); 3273 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3274 return true; 3275} 3276 3277/// Builds a shadow declaration corresponding to a 'using' declaration. 3278UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3279 UsingDecl *UD, 3280 NamedDecl *Orig) { 3281 3282 // If we resolved to another shadow declaration, just coalesce them. 3283 NamedDecl *Target = Orig; 3284 if (isa<UsingShadowDecl>(Target)) { 3285 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3286 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3287 } 3288 3289 UsingShadowDecl *Shadow 3290 = UsingShadowDecl::Create(Context, CurContext, 3291 UD->getLocation(), UD, Target); 3292 UD->addShadowDecl(Shadow); 3293 3294 if (S) 3295 PushOnScopeChains(Shadow, S); 3296 else 3297 CurContext->addDecl(Shadow); 3298 Shadow->setAccess(UD->getAccess()); 3299 3300 // Register it as a conversion if appropriate. 3301 if (Shadow->getDeclName().getNameKind() 3302 == DeclarationName::CXXConversionFunctionName) 3303 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3304 3305 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3306 Shadow->setInvalidDecl(); 3307 3308 return Shadow; 3309} 3310 3311/// Hides a using shadow declaration. This is required by the current 3312/// using-decl implementation when a resolvable using declaration in a 3313/// class is followed by a declaration which would hide or override 3314/// one or more of the using decl's targets; for example: 3315/// 3316/// struct Base { void foo(int); }; 3317/// struct Derived : Base { 3318/// using Base::foo; 3319/// void foo(int); 3320/// }; 3321/// 3322/// The governing language is C++03 [namespace.udecl]p12: 3323/// 3324/// When a using-declaration brings names from a base class into a 3325/// derived class scope, member functions in the derived class 3326/// override and/or hide member functions with the same name and 3327/// parameter types in a base class (rather than conflicting). 3328/// 3329/// There are two ways to implement this: 3330/// (1) optimistically create shadow decls when they're not hidden 3331/// by existing declarations, or 3332/// (2) don't create any shadow decls (or at least don't make them 3333/// visible) until we've fully parsed/instantiated the class. 3334/// The problem with (1) is that we might have to retroactively remove 3335/// a shadow decl, which requires several O(n) operations because the 3336/// decl structures are (very reasonably) not designed for removal. 3337/// (2) avoids this but is very fiddly and phase-dependent. 3338void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3339 if (Shadow->getDeclName().getNameKind() == 3340 DeclarationName::CXXConversionFunctionName) 3341 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3342 3343 // Remove it from the DeclContext... 3344 Shadow->getDeclContext()->removeDecl(Shadow); 3345 3346 // ...and the scope, if applicable... 3347 if (S) { 3348 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3349 IdResolver.RemoveDecl(Shadow); 3350 } 3351 3352 // ...and the using decl. 3353 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3354 3355 // TODO: complain somehow if Shadow was used. It shouldn't 3356 // be possible for this to happen, because...? 3357} 3358 3359/// Builds a using declaration. 3360/// 3361/// \param IsInstantiation - Whether this call arises from an 3362/// instantiation of an unresolved using declaration. We treat 3363/// the lookup differently for these declarations. 3364NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3365 SourceLocation UsingLoc, 3366 const CXXScopeSpec &SS, 3367 SourceLocation IdentLoc, 3368 DeclarationName Name, 3369 AttributeList *AttrList, 3370 bool IsInstantiation, 3371 bool IsTypeName, 3372 SourceLocation TypenameLoc) { 3373 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3374 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3375 3376 // FIXME: We ignore attributes for now. 3377 delete AttrList; 3378 3379 if (SS.isEmpty()) { 3380 Diag(IdentLoc, diag::err_using_requires_qualname); 3381 return 0; 3382 } 3383 3384 // Do the redeclaration lookup in the current scope. 3385 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3386 ForRedeclaration); 3387 Previous.setHideTags(false); 3388 if (S) { 3389 LookupName(Previous, S); 3390 3391 // It is really dumb that we have to do this. 3392 LookupResult::Filter F = Previous.makeFilter(); 3393 while (F.hasNext()) { 3394 NamedDecl *D = F.next(); 3395 if (!isDeclInScope(D, CurContext, S)) 3396 F.erase(); 3397 } 3398 F.done(); 3399 } else { 3400 assert(IsInstantiation && "no scope in non-instantiation"); 3401 assert(CurContext->isRecord() && "scope not record in instantiation"); 3402 LookupQualifiedName(Previous, CurContext); 3403 } 3404 3405 NestedNameSpecifier *NNS = 3406 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3407 3408 // Check for invalid redeclarations. 3409 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3410 return 0; 3411 3412 // Check for bad qualifiers. 3413 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3414 return 0; 3415 3416 DeclContext *LookupContext = computeDeclContext(SS); 3417 NamedDecl *D; 3418 if (!LookupContext) { 3419 if (IsTypeName) { 3420 // FIXME: not all declaration name kinds are legal here 3421 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3422 UsingLoc, TypenameLoc, 3423 SS.getRange(), NNS, 3424 IdentLoc, Name); 3425 } else { 3426 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3427 UsingLoc, SS.getRange(), NNS, 3428 IdentLoc, Name); 3429 } 3430 } else { 3431 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3432 SS.getRange(), UsingLoc, NNS, Name, 3433 IsTypeName); 3434 } 3435 D->setAccess(AS); 3436 CurContext->addDecl(D); 3437 3438 if (!LookupContext) return D; 3439 UsingDecl *UD = cast<UsingDecl>(D); 3440 3441 if (RequireCompleteDeclContext(SS)) { 3442 UD->setInvalidDecl(); 3443 return UD; 3444 } 3445 3446 // Look up the target name. 3447 3448 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3449 3450 // Unlike most lookups, we don't always want to hide tag 3451 // declarations: tag names are visible through the using declaration 3452 // even if hidden by ordinary names, *except* in a dependent context 3453 // where it's important for the sanity of two-phase lookup. 3454 if (!IsInstantiation) 3455 R.setHideTags(false); 3456 3457 LookupQualifiedName(R, LookupContext); 3458 3459 if (R.empty()) { 3460 Diag(IdentLoc, diag::err_no_member) 3461 << Name << LookupContext << SS.getRange(); 3462 UD->setInvalidDecl(); 3463 return UD; 3464 } 3465 3466 if (R.isAmbiguous()) { 3467 UD->setInvalidDecl(); 3468 return UD; 3469 } 3470 3471 if (IsTypeName) { 3472 // If we asked for a typename and got a non-type decl, error out. 3473 if (!R.getAsSingle<TypeDecl>()) { 3474 Diag(IdentLoc, diag::err_using_typename_non_type); 3475 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3476 Diag((*I)->getUnderlyingDecl()->getLocation(), 3477 diag::note_using_decl_target); 3478 UD->setInvalidDecl(); 3479 return UD; 3480 } 3481 } else { 3482 // If we asked for a non-typename and we got a type, error out, 3483 // but only if this is an instantiation of an unresolved using 3484 // decl. Otherwise just silently find the type name. 3485 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3486 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3487 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3488 UD->setInvalidDecl(); 3489 return UD; 3490 } 3491 } 3492 3493 // C++0x N2914 [namespace.udecl]p6: 3494 // A using-declaration shall not name a namespace. 3495 if (R.getAsSingle<NamespaceDecl>()) { 3496 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3497 << SS.getRange(); 3498 UD->setInvalidDecl(); 3499 return UD; 3500 } 3501 3502 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3503 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3504 BuildUsingShadowDecl(S, UD, *I); 3505 } 3506 3507 return UD; 3508} 3509 3510/// Checks that the given using declaration is not an invalid 3511/// redeclaration. Note that this is checking only for the using decl 3512/// itself, not for any ill-formedness among the UsingShadowDecls. 3513bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3514 bool isTypeName, 3515 const CXXScopeSpec &SS, 3516 SourceLocation NameLoc, 3517 const LookupResult &Prev) { 3518 // C++03 [namespace.udecl]p8: 3519 // C++0x [namespace.udecl]p10: 3520 // A using-declaration is a declaration and can therefore be used 3521 // repeatedly where (and only where) multiple declarations are 3522 // allowed. 3523 // That's only in file contexts. 3524 if (CurContext->getLookupContext()->isFileContext()) 3525 return false; 3526 3527 NestedNameSpecifier *Qual 3528 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3529 3530 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3531 NamedDecl *D = *I; 3532 3533 bool DTypename; 3534 NestedNameSpecifier *DQual; 3535 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3536 DTypename = UD->isTypeName(); 3537 DQual = UD->getTargetNestedNameDecl(); 3538 } else if (UnresolvedUsingValueDecl *UD 3539 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3540 DTypename = false; 3541 DQual = UD->getTargetNestedNameSpecifier(); 3542 } else if (UnresolvedUsingTypenameDecl *UD 3543 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3544 DTypename = true; 3545 DQual = UD->getTargetNestedNameSpecifier(); 3546 } else continue; 3547 3548 // using decls differ if one says 'typename' and the other doesn't. 3549 // FIXME: non-dependent using decls? 3550 if (isTypeName != DTypename) continue; 3551 3552 // using decls differ if they name different scopes (but note that 3553 // template instantiation can cause this check to trigger when it 3554 // didn't before instantiation). 3555 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3556 Context.getCanonicalNestedNameSpecifier(DQual)) 3557 continue; 3558 3559 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3560 Diag(D->getLocation(), diag::note_using_decl) << 1; 3561 return true; 3562 } 3563 3564 return false; 3565} 3566 3567 3568/// Checks that the given nested-name qualifier used in a using decl 3569/// in the current context is appropriately related to the current 3570/// scope. If an error is found, diagnoses it and returns true. 3571bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3572 const CXXScopeSpec &SS, 3573 SourceLocation NameLoc) { 3574 DeclContext *NamedContext = computeDeclContext(SS); 3575 3576 if (!CurContext->isRecord()) { 3577 // C++03 [namespace.udecl]p3: 3578 // C++0x [namespace.udecl]p8: 3579 // A using-declaration for a class member shall be a member-declaration. 3580 3581 // If we weren't able to compute a valid scope, it must be a 3582 // dependent class scope. 3583 if (!NamedContext || NamedContext->isRecord()) { 3584 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3585 << SS.getRange(); 3586 return true; 3587 } 3588 3589 // Otherwise, everything is known to be fine. 3590 return false; 3591 } 3592 3593 // The current scope is a record. 3594 3595 // If the named context is dependent, we can't decide much. 3596 if (!NamedContext) { 3597 // FIXME: in C++0x, we can diagnose if we can prove that the 3598 // nested-name-specifier does not refer to a base class, which is 3599 // still possible in some cases. 3600 3601 // Otherwise we have to conservatively report that things might be 3602 // okay. 3603 return false; 3604 } 3605 3606 if (!NamedContext->isRecord()) { 3607 // Ideally this would point at the last name in the specifier, 3608 // but we don't have that level of source info. 3609 Diag(SS.getRange().getBegin(), 3610 diag::err_using_decl_nested_name_specifier_is_not_class) 3611 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3612 return true; 3613 } 3614 3615 if (getLangOptions().CPlusPlus0x) { 3616 // C++0x [namespace.udecl]p3: 3617 // In a using-declaration used as a member-declaration, the 3618 // nested-name-specifier shall name a base class of the class 3619 // being defined. 3620 3621 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3622 cast<CXXRecordDecl>(NamedContext))) { 3623 if (CurContext == NamedContext) { 3624 Diag(NameLoc, 3625 diag::err_using_decl_nested_name_specifier_is_current_class) 3626 << SS.getRange(); 3627 return true; 3628 } 3629 3630 Diag(SS.getRange().getBegin(), 3631 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3632 << (NestedNameSpecifier*) SS.getScopeRep() 3633 << cast<CXXRecordDecl>(CurContext) 3634 << SS.getRange(); 3635 return true; 3636 } 3637 3638 return false; 3639 } 3640 3641 // C++03 [namespace.udecl]p4: 3642 // A using-declaration used as a member-declaration shall refer 3643 // to a member of a base class of the class being defined [etc.]. 3644 3645 // Salient point: SS doesn't have to name a base class as long as 3646 // lookup only finds members from base classes. Therefore we can 3647 // diagnose here only if we can prove that that can't happen, 3648 // i.e. if the class hierarchies provably don't intersect. 3649 3650 // TODO: it would be nice if "definitely valid" results were cached 3651 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3652 // need to be repeated. 3653 3654 struct UserData { 3655 llvm::DenseSet<const CXXRecordDecl*> Bases; 3656 3657 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3658 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3659 Data->Bases.insert(Base); 3660 return true; 3661 } 3662 3663 bool hasDependentBases(const CXXRecordDecl *Class) { 3664 return !Class->forallBases(collect, this); 3665 } 3666 3667 /// Returns true if the base is dependent or is one of the 3668 /// accumulated base classes. 3669 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3670 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3671 return !Data->Bases.count(Base); 3672 } 3673 3674 bool mightShareBases(const CXXRecordDecl *Class) { 3675 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3676 } 3677 }; 3678 3679 UserData Data; 3680 3681 // Returns false if we find a dependent base. 3682 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3683 return false; 3684 3685 // Returns false if the class has a dependent base or if it or one 3686 // of its bases is present in the base set of the current context. 3687 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3688 return false; 3689 3690 Diag(SS.getRange().getBegin(), 3691 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3692 << (NestedNameSpecifier*) SS.getScopeRep() 3693 << cast<CXXRecordDecl>(CurContext) 3694 << SS.getRange(); 3695 3696 return true; 3697} 3698 3699Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3700 SourceLocation NamespaceLoc, 3701 SourceLocation AliasLoc, 3702 IdentifierInfo *Alias, 3703 const CXXScopeSpec &SS, 3704 SourceLocation IdentLoc, 3705 IdentifierInfo *Ident) { 3706 3707 // Lookup the namespace name. 3708 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3709 LookupParsedName(R, S, &SS); 3710 3711 // Check if we have a previous declaration with the same name. 3712 if (NamedDecl *PrevDecl 3713 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3714 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3715 // We already have an alias with the same name that points to the same 3716 // namespace, so don't create a new one. 3717 // FIXME: At some point, we'll want to create the (redundant) 3718 // declaration to maintain better source information. 3719 if (!R.isAmbiguous() && !R.empty() && 3720 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3721 return DeclPtrTy(); 3722 } 3723 3724 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3725 diag::err_redefinition_different_kind; 3726 Diag(AliasLoc, DiagID) << Alias; 3727 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3728 return DeclPtrTy(); 3729 } 3730 3731 if (R.isAmbiguous()) 3732 return DeclPtrTy(); 3733 3734 if (R.empty()) { 3735 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3736 return DeclPtrTy(); 3737 } 3738 3739 NamespaceAliasDecl *AliasDecl = 3740 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3741 Alias, SS.getRange(), 3742 (NestedNameSpecifier *)SS.getScopeRep(), 3743 IdentLoc, R.getFoundDecl()); 3744 3745 PushOnScopeChains(AliasDecl, S); 3746 return DeclPtrTy::make(AliasDecl); 3747} 3748 3749void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3750 CXXConstructorDecl *Constructor) { 3751 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3752 !Constructor->isUsed()) && 3753 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3754 3755 CXXRecordDecl *ClassDecl 3756 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3757 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3758 3759 DeclContext *PreviousContext = CurContext; 3760 CurContext = Constructor; 3761 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3762 Diag(CurrentLocation, diag::note_member_synthesized_at) 3763 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3764 Constructor->setInvalidDecl(); 3765 } else { 3766 Constructor->setUsed(); 3767 } 3768 CurContext = PreviousContext; 3769} 3770 3771void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3772 CXXDestructorDecl *Destructor) { 3773 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3774 "DefineImplicitDestructor - call it for implicit default dtor"); 3775 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3776 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3777 3778 DeclContext *PreviousContext = CurContext; 3779 CurContext = Destructor; 3780 3781 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3782 Destructor->getParent()); 3783 3784 // FIXME: If CheckDestructor fails, we should emit a note about where the 3785 // implicit destructor was needed. 3786 if (CheckDestructor(Destructor)) { 3787 Diag(CurrentLocation, diag::note_member_synthesized_at) 3788 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3789 3790 Destructor->setInvalidDecl(); 3791 CurContext = PreviousContext; 3792 3793 return; 3794 } 3795 CurContext = PreviousContext; 3796 3797 Destructor->setUsed(); 3798} 3799 3800void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3801 CXXMethodDecl *MethodDecl) { 3802 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3803 MethodDecl->getOverloadedOperator() == OO_Equal && 3804 !MethodDecl->isUsed()) && 3805 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3806 3807 CXXRecordDecl *ClassDecl 3808 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3809 3810 DeclContext *PreviousContext = CurContext; 3811 CurContext = MethodDecl; 3812 3813 // C++[class.copy] p12 3814 // Before the implicitly-declared copy assignment operator for a class is 3815 // implicitly defined, all implicitly-declared copy assignment operators 3816 // for its direct base classes and its nonstatic data members shall have 3817 // been implicitly defined. 3818 bool err = false; 3819 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3820 E = ClassDecl->bases_end(); Base != E; ++Base) { 3821 CXXRecordDecl *BaseClassDecl 3822 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3823 if (CXXMethodDecl *BaseAssignOpMethod = 3824 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3825 BaseClassDecl)) { 3826 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3827 BaseAssignOpMethod, 3828 PDiag(diag::err_access_assign_base) 3829 << Base->getType()); 3830 3831 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3832 } 3833 } 3834 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3835 E = ClassDecl->field_end(); Field != E; ++Field) { 3836 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3837 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3838 FieldType = Array->getElementType(); 3839 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3840 CXXRecordDecl *FieldClassDecl 3841 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3842 if (CXXMethodDecl *FieldAssignOpMethod = 3843 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3844 FieldClassDecl)) { 3845 CheckDirectMemberAccess(Field->getLocation(), 3846 FieldAssignOpMethod, 3847 PDiag(diag::err_access_assign_field) 3848 << Field->getDeclName() << Field->getType()); 3849 3850 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3851 } 3852 } else if (FieldType->isReferenceType()) { 3853 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3854 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3855 Diag(Field->getLocation(), diag::note_declared_at); 3856 Diag(CurrentLocation, diag::note_first_required_here); 3857 err = true; 3858 } else if (FieldType.isConstQualified()) { 3859 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3860 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3861 Diag(Field->getLocation(), diag::note_declared_at); 3862 Diag(CurrentLocation, diag::note_first_required_here); 3863 err = true; 3864 } 3865 } 3866 if (!err) 3867 MethodDecl->setUsed(); 3868 3869 CurContext = PreviousContext; 3870} 3871 3872CXXMethodDecl * 3873Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3874 ParmVarDecl *ParmDecl, 3875 CXXRecordDecl *ClassDecl) { 3876 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3877 QualType RHSType(LHSType); 3878 // If class's assignment operator argument is const/volatile qualified, 3879 // look for operator = (const/volatile B&). Otherwise, look for 3880 // operator = (B&). 3881 RHSType = Context.getCVRQualifiedType(RHSType, 3882 ParmDecl->getType().getCVRQualifiers()); 3883 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3884 LHSType, 3885 SourceLocation())); 3886 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3887 RHSType, 3888 CurrentLocation)); 3889 Expr *Args[2] = { &*LHS, &*RHS }; 3890 OverloadCandidateSet CandidateSet(CurrentLocation); 3891 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3892 CandidateSet); 3893 OverloadCandidateSet::iterator Best; 3894 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3895 return cast<CXXMethodDecl>(Best->Function); 3896 assert(false && 3897 "getAssignOperatorMethod - copy assignment operator method not found"); 3898 return 0; 3899} 3900 3901void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3902 CXXConstructorDecl *CopyConstructor, 3903 unsigned TypeQuals) { 3904 assert((CopyConstructor->isImplicit() && 3905 CopyConstructor->isCopyConstructor(TypeQuals) && 3906 !CopyConstructor->isUsed()) && 3907 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3908 3909 CXXRecordDecl *ClassDecl 3910 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3911 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3912 3913 DeclContext *PreviousContext = CurContext; 3914 CurContext = CopyConstructor; 3915 3916 // C++ [class.copy] p209 3917 // Before the implicitly-declared copy constructor for a class is 3918 // implicitly defined, all the implicitly-declared copy constructors 3919 // for its base class and its non-static data members shall have been 3920 // implicitly defined. 3921 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3922 Base != ClassDecl->bases_end(); ++Base) { 3923 CXXRecordDecl *BaseClassDecl 3924 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3925 if (CXXConstructorDecl *BaseCopyCtor = 3926 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3927 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3928 BaseCopyCtor, 3929 PDiag(diag::err_access_copy_base) 3930 << Base->getType()); 3931 3932 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3933 } 3934 } 3935 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3936 FieldEnd = ClassDecl->field_end(); 3937 Field != FieldEnd; ++Field) { 3938 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3939 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3940 FieldType = Array->getElementType(); 3941 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3942 CXXRecordDecl *FieldClassDecl 3943 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3944 if (CXXConstructorDecl *FieldCopyCtor = 3945 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 3946 CheckDirectMemberAccess(Field->getLocation(), 3947 FieldCopyCtor, 3948 PDiag(diag::err_access_copy_field) 3949 << Field->getDeclName() << Field->getType()); 3950 3951 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3952 } 3953 } 3954 } 3955 CopyConstructor->setUsed(); 3956 3957 CurContext = PreviousContext; 3958} 3959 3960Sema::OwningExprResult 3961Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3962 CXXConstructorDecl *Constructor, 3963 MultiExprArg ExprArgs, 3964 bool RequiresZeroInit, 3965 bool BaseInitialization) { 3966 bool Elidable = false; 3967 3968 // C++ [class.copy]p15: 3969 // Whenever a temporary class object is copied using a copy constructor, and 3970 // this object and the copy have the same cv-unqualified type, an 3971 // implementation is permitted to treat the original and the copy as two 3972 // different ways of referring to the same object and not perform a copy at 3973 // all, even if the class copy constructor or destructor have side effects. 3974 3975 // FIXME: Is this enough? 3976 if (Constructor->isCopyConstructor()) { 3977 Expr *E = ((Expr **)ExprArgs.get())[0]; 3978 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3979 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3980 E = ICE->getSubExpr(); 3981 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3982 E = FCE->getSubExpr(); 3983 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3984 E = BE->getSubExpr(); 3985 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3986 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3987 E = ICE->getSubExpr(); 3988 3989 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3990 Elidable = !CE->getCallReturnType()->isReferenceType(); 3991 else if (isa<CXXTemporaryObjectExpr>(E)) 3992 Elidable = true; 3993 else if (isa<CXXConstructExpr>(E)) 3994 Elidable = true; 3995 } 3996 3997 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3998 Elidable, move(ExprArgs), RequiresZeroInit, 3999 BaseInitialization); 4000} 4001 4002/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4003/// including handling of its default argument expressions. 4004Sema::OwningExprResult 4005Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4006 CXXConstructorDecl *Constructor, bool Elidable, 4007 MultiExprArg ExprArgs, 4008 bool RequiresZeroInit, 4009 bool BaseInitialization) { 4010 unsigned NumExprs = ExprArgs.size(); 4011 Expr **Exprs = (Expr **)ExprArgs.release(); 4012 4013 MarkDeclarationReferenced(ConstructLoc, Constructor); 4014 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4015 Constructor, Elidable, Exprs, NumExprs, 4016 RequiresZeroInit, BaseInitialization)); 4017} 4018 4019bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4020 CXXConstructorDecl *Constructor, 4021 MultiExprArg Exprs) { 4022 OwningExprResult TempResult = 4023 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4024 move(Exprs)); 4025 if (TempResult.isInvalid()) 4026 return true; 4027 4028 Expr *Temp = TempResult.takeAs<Expr>(); 4029 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4030 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4031 VD->setInit(Temp); 4032 4033 return false; 4034} 4035 4036void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4037 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4038 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4039 !ClassDecl->hasTrivialDestructor()) { 4040 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4041 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4042 CheckDestructorAccess(VD->getLocation(), Destructor, 4043 PDiag(diag::err_access_dtor_var) 4044 << VD->getDeclName() 4045 << VD->getType()); 4046 } 4047} 4048 4049/// AddCXXDirectInitializerToDecl - This action is called immediately after 4050/// ActOnDeclarator, when a C++ direct initializer is present. 4051/// e.g: "int x(1);" 4052void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4053 SourceLocation LParenLoc, 4054 MultiExprArg Exprs, 4055 SourceLocation *CommaLocs, 4056 SourceLocation RParenLoc) { 4057 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4058 Decl *RealDecl = Dcl.getAs<Decl>(); 4059 4060 // If there is no declaration, there was an error parsing it. Just ignore 4061 // the initializer. 4062 if (RealDecl == 0) 4063 return; 4064 4065 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4066 if (!VDecl) { 4067 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4068 RealDecl->setInvalidDecl(); 4069 return; 4070 } 4071 4072 // We will represent direct-initialization similarly to copy-initialization: 4073 // int x(1); -as-> int x = 1; 4074 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4075 // 4076 // Clients that want to distinguish between the two forms, can check for 4077 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4078 // A major benefit is that clients that don't particularly care about which 4079 // exactly form was it (like the CodeGen) can handle both cases without 4080 // special case code. 4081 4082 // C++ 8.5p11: 4083 // The form of initialization (using parentheses or '=') is generally 4084 // insignificant, but does matter when the entity being initialized has a 4085 // class type. 4086 QualType DeclInitType = VDecl->getType(); 4087 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4088 DeclInitType = Context.getBaseElementType(Array); 4089 4090 if (!VDecl->getType()->isDependentType() && 4091 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4092 diag::err_typecheck_decl_incomplete_type)) { 4093 VDecl->setInvalidDecl(); 4094 return; 4095 } 4096 4097 // The variable can not have an abstract class type. 4098 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4099 diag::err_abstract_type_in_decl, 4100 AbstractVariableType)) 4101 VDecl->setInvalidDecl(); 4102 4103 const VarDecl *Def; 4104 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4105 Diag(VDecl->getLocation(), diag::err_redefinition) 4106 << VDecl->getDeclName(); 4107 Diag(Def->getLocation(), diag::note_previous_definition); 4108 VDecl->setInvalidDecl(); 4109 return; 4110 } 4111 4112 // If either the declaration has a dependent type or if any of the 4113 // expressions is type-dependent, we represent the initialization 4114 // via a ParenListExpr for later use during template instantiation. 4115 if (VDecl->getType()->isDependentType() || 4116 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4117 // Let clients know that initialization was done with a direct initializer. 4118 VDecl->setCXXDirectInitializer(true); 4119 4120 // Store the initialization expressions as a ParenListExpr. 4121 unsigned NumExprs = Exprs.size(); 4122 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4123 (Expr **)Exprs.release(), 4124 NumExprs, RParenLoc)); 4125 return; 4126 } 4127 4128 // Capture the variable that is being initialized and the style of 4129 // initialization. 4130 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4131 4132 // FIXME: Poor source location information. 4133 InitializationKind Kind 4134 = InitializationKind::CreateDirect(VDecl->getLocation(), 4135 LParenLoc, RParenLoc); 4136 4137 InitializationSequence InitSeq(*this, Entity, Kind, 4138 (Expr**)Exprs.get(), Exprs.size()); 4139 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4140 if (Result.isInvalid()) { 4141 VDecl->setInvalidDecl(); 4142 return; 4143 } 4144 4145 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4146 VDecl->setInit(Result.takeAs<Expr>()); 4147 VDecl->setCXXDirectInitializer(true); 4148 4149 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4150 FinalizeVarWithDestructor(VDecl, Record); 4151} 4152 4153/// \brief Add the applicable constructor candidates for an initialization 4154/// by constructor. 4155static void AddConstructorInitializationCandidates(Sema &SemaRef, 4156 QualType ClassType, 4157 Expr **Args, 4158 unsigned NumArgs, 4159 InitializationKind Kind, 4160 OverloadCandidateSet &CandidateSet) { 4161 // C++ [dcl.init]p14: 4162 // If the initialization is direct-initialization, or if it is 4163 // copy-initialization where the cv-unqualified version of the 4164 // source type is the same class as, or a derived class of, the 4165 // class of the destination, constructors are considered. The 4166 // applicable constructors are enumerated (13.3.1.3), and the 4167 // best one is chosen through overload resolution (13.3). The 4168 // constructor so selected is called to initialize the object, 4169 // with the initializer expression(s) as its argument(s). If no 4170 // constructor applies, or the overload resolution is ambiguous, 4171 // the initialization is ill-formed. 4172 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4173 assert(ClassRec && "Can only initialize a class type here"); 4174 4175 // FIXME: When we decide not to synthesize the implicitly-declared 4176 // constructors, we'll need to make them appear here. 4177 4178 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4179 DeclarationName ConstructorName 4180 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4181 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4182 DeclContext::lookup_const_iterator Con, ConEnd; 4183 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4184 Con != ConEnd; ++Con) { 4185 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4186 4187 // Find the constructor (which may be a template). 4188 CXXConstructorDecl *Constructor = 0; 4189 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4190 if (ConstructorTmpl) 4191 Constructor 4192 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4193 else 4194 Constructor = cast<CXXConstructorDecl>(*Con); 4195 4196 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4197 (Kind.getKind() == InitializationKind::IK_Value) || 4198 (Kind.getKind() == InitializationKind::IK_Copy && 4199 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4200 ((Kind.getKind() == InitializationKind::IK_Default) && 4201 Constructor->isDefaultConstructor())) { 4202 if (ConstructorTmpl) 4203 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4204 /*ExplicitArgs*/ 0, 4205 Args, NumArgs, CandidateSet); 4206 else 4207 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4208 Args, NumArgs, CandidateSet); 4209 } 4210 } 4211} 4212 4213/// \brief Attempt to perform initialization by constructor 4214/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4215/// copy-initialization. 4216/// 4217/// This routine determines whether initialization by constructor is possible, 4218/// but it does not emit any diagnostics in the case where the initialization 4219/// is ill-formed. 4220/// 4221/// \param ClassType the type of the object being initialized, which must have 4222/// class type. 4223/// 4224/// \param Args the arguments provided to initialize the object 4225/// 4226/// \param NumArgs the number of arguments provided to initialize the object 4227/// 4228/// \param Kind the type of initialization being performed 4229/// 4230/// \returns the constructor used to initialize the object, if successful. 4231/// Otherwise, emits a diagnostic and returns NULL. 4232CXXConstructorDecl * 4233Sema::TryInitializationByConstructor(QualType ClassType, 4234 Expr **Args, unsigned NumArgs, 4235 SourceLocation Loc, 4236 InitializationKind Kind) { 4237 // Build the overload candidate set 4238 OverloadCandidateSet CandidateSet(Loc); 4239 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4240 CandidateSet); 4241 4242 // Determine whether we found a constructor we can use. 4243 OverloadCandidateSet::iterator Best; 4244 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4245 case OR_Success: 4246 case OR_Deleted: 4247 // We found a constructor. Return it. 4248 return cast<CXXConstructorDecl>(Best->Function); 4249 4250 case OR_No_Viable_Function: 4251 case OR_Ambiguous: 4252 // Overload resolution failed. Return nothing. 4253 return 0; 4254 } 4255 4256 // Silence GCC warning 4257 return 0; 4258} 4259 4260/// \brief Given a constructor and the set of arguments provided for the 4261/// constructor, convert the arguments and add any required default arguments 4262/// to form a proper call to this constructor. 4263/// 4264/// \returns true if an error occurred, false otherwise. 4265bool 4266Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4267 MultiExprArg ArgsPtr, 4268 SourceLocation Loc, 4269 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4270 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4271 unsigned NumArgs = ArgsPtr.size(); 4272 Expr **Args = (Expr **)ArgsPtr.get(); 4273 4274 const FunctionProtoType *Proto 4275 = Constructor->getType()->getAs<FunctionProtoType>(); 4276 assert(Proto && "Constructor without a prototype?"); 4277 unsigned NumArgsInProto = Proto->getNumArgs(); 4278 4279 // If too few arguments are available, we'll fill in the rest with defaults. 4280 if (NumArgs < NumArgsInProto) 4281 ConvertedArgs.reserve(NumArgsInProto); 4282 else 4283 ConvertedArgs.reserve(NumArgs); 4284 4285 VariadicCallType CallType = 4286 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4287 llvm::SmallVector<Expr *, 8> AllArgs; 4288 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4289 Proto, 0, Args, NumArgs, AllArgs, 4290 CallType); 4291 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4292 ConvertedArgs.push_back(AllArgs[i]); 4293 return Invalid; 4294} 4295 4296/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4297/// determine whether they are reference-related, 4298/// reference-compatible, reference-compatible with added 4299/// qualification, or incompatible, for use in C++ initialization by 4300/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4301/// type, and the first type (T1) is the pointee type of the reference 4302/// type being initialized. 4303Sema::ReferenceCompareResult 4304Sema::CompareReferenceRelationship(SourceLocation Loc, 4305 QualType OrigT1, QualType OrigT2, 4306 bool& DerivedToBase) { 4307 assert(!OrigT1->isReferenceType() && 4308 "T1 must be the pointee type of the reference type"); 4309 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4310 4311 QualType T1 = Context.getCanonicalType(OrigT1); 4312 QualType T2 = Context.getCanonicalType(OrigT2); 4313 Qualifiers T1Quals, T2Quals; 4314 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4315 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4316 4317 // C++ [dcl.init.ref]p4: 4318 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4319 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4320 // T1 is a base class of T2. 4321 if (UnqualT1 == UnqualT2) 4322 DerivedToBase = false; 4323 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4324 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4325 IsDerivedFrom(UnqualT2, UnqualT1)) 4326 DerivedToBase = true; 4327 else 4328 return Ref_Incompatible; 4329 4330 // At this point, we know that T1 and T2 are reference-related (at 4331 // least). 4332 4333 // If the type is an array type, promote the element qualifiers to the type 4334 // for comparison. 4335 if (isa<ArrayType>(T1) && T1Quals) 4336 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4337 if (isa<ArrayType>(T2) && T2Quals) 4338 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4339 4340 // C++ [dcl.init.ref]p4: 4341 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4342 // reference-related to T2 and cv1 is the same cv-qualification 4343 // as, or greater cv-qualification than, cv2. For purposes of 4344 // overload resolution, cases for which cv1 is greater 4345 // cv-qualification than cv2 are identified as 4346 // reference-compatible with added qualification (see 13.3.3.2). 4347 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4348 return Ref_Compatible; 4349 else if (T1.isMoreQualifiedThan(T2)) 4350 return Ref_Compatible_With_Added_Qualification; 4351 else 4352 return Ref_Related; 4353} 4354 4355/// CheckReferenceInit - Check the initialization of a reference 4356/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4357/// the initializer (either a simple initializer or an initializer 4358/// list), and DeclType is the type of the declaration. When ICS is 4359/// non-null, this routine will compute the implicit conversion 4360/// sequence according to C++ [over.ics.ref] and will not produce any 4361/// diagnostics; when ICS is null, it will emit diagnostics when any 4362/// errors are found. Either way, a return value of true indicates 4363/// that there was a failure, a return value of false indicates that 4364/// the reference initialization succeeded. 4365/// 4366/// When @p SuppressUserConversions, user-defined conversions are 4367/// suppressed. 4368/// When @p AllowExplicit, we also permit explicit user-defined 4369/// conversion functions. 4370/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4371/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4372/// This is used when this is called from a C-style cast. 4373bool 4374Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4375 SourceLocation DeclLoc, 4376 bool SuppressUserConversions, 4377 bool AllowExplicit, bool ForceRValue, 4378 ImplicitConversionSequence *ICS, 4379 bool IgnoreBaseAccess) { 4380 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4381 4382 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4383 QualType T2 = Init->getType(); 4384 4385 // If the initializer is the address of an overloaded function, try 4386 // to resolve the overloaded function. If all goes well, T2 is the 4387 // type of the resulting function. 4388 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4389 DeclAccessPair Found; 4390 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4391 ICS != 0, Found); 4392 if (Fn) { 4393 // Since we're performing this reference-initialization for 4394 // real, update the initializer with the resulting function. 4395 if (!ICS) { 4396 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4397 return true; 4398 4399 CheckAddressOfMemberAccess(Init, Found); 4400 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4401 } 4402 4403 T2 = Fn->getType(); 4404 } 4405 } 4406 4407 // Compute some basic properties of the types and the initializer. 4408 bool isRValRef = DeclType->isRValueReferenceType(); 4409 bool DerivedToBase = false; 4410 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4411 Init->isLvalue(Context); 4412 ReferenceCompareResult RefRelationship 4413 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4414 4415 // Most paths end in a failed conversion. 4416 if (ICS) { 4417 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4418 } 4419 4420 // C++ [dcl.init.ref]p5: 4421 // A reference to type "cv1 T1" is initialized by an expression 4422 // of type "cv2 T2" as follows: 4423 4424 // -- If the initializer expression 4425 4426 // Rvalue references cannot bind to lvalues (N2812). 4427 // There is absolutely no situation where they can. In particular, note that 4428 // this is ill-formed, even if B has a user-defined conversion to A&&: 4429 // B b; 4430 // A&& r = b; 4431 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4432 if (!ICS) 4433 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4434 << Init->getSourceRange(); 4435 return true; 4436 } 4437 4438 bool BindsDirectly = false; 4439 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4440 // reference-compatible with "cv2 T2," or 4441 // 4442 // Note that the bit-field check is skipped if we are just computing 4443 // the implicit conversion sequence (C++ [over.best.ics]p2). 4444 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4445 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4446 BindsDirectly = true; 4447 4448 if (ICS) { 4449 // C++ [over.ics.ref]p1: 4450 // When a parameter of reference type binds directly (8.5.3) 4451 // to an argument expression, the implicit conversion sequence 4452 // is the identity conversion, unless the argument expression 4453 // has a type that is a derived class of the parameter type, 4454 // in which case the implicit conversion sequence is a 4455 // derived-to-base Conversion (13.3.3.1). 4456 ICS->setStandard(); 4457 ICS->Standard.First = ICK_Identity; 4458 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4459 ICS->Standard.Third = ICK_Identity; 4460 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4461 ICS->Standard.setToType(0, T2); 4462 ICS->Standard.setToType(1, T1); 4463 ICS->Standard.setToType(2, T1); 4464 ICS->Standard.ReferenceBinding = true; 4465 ICS->Standard.DirectBinding = true; 4466 ICS->Standard.RRefBinding = false; 4467 ICS->Standard.CopyConstructor = 0; 4468 4469 // Nothing more to do: the inaccessibility/ambiguity check for 4470 // derived-to-base conversions is suppressed when we're 4471 // computing the implicit conversion sequence (C++ 4472 // [over.best.ics]p2). 4473 return false; 4474 } else { 4475 // Perform the conversion. 4476 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4477 if (DerivedToBase) 4478 CK = CastExpr::CK_DerivedToBase; 4479 else if(CheckExceptionSpecCompatibility(Init, T1)) 4480 return true; 4481 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4482 } 4483 } 4484 4485 // -- has a class type (i.e., T2 is a class type) and can be 4486 // implicitly converted to an lvalue of type "cv3 T3," 4487 // where "cv1 T1" is reference-compatible with "cv3 T3" 4488 // 92) (this conversion is selected by enumerating the 4489 // applicable conversion functions (13.3.1.6) and choosing 4490 // the best one through overload resolution (13.3)), 4491 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4492 !RequireCompleteType(DeclLoc, T2, 0)) { 4493 CXXRecordDecl *T2RecordDecl 4494 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4495 4496 OverloadCandidateSet CandidateSet(DeclLoc); 4497 const UnresolvedSetImpl *Conversions 4498 = T2RecordDecl->getVisibleConversionFunctions(); 4499 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4500 E = Conversions->end(); I != E; ++I) { 4501 NamedDecl *D = *I; 4502 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4503 if (isa<UsingShadowDecl>(D)) 4504 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4505 4506 FunctionTemplateDecl *ConvTemplate 4507 = dyn_cast<FunctionTemplateDecl>(D); 4508 CXXConversionDecl *Conv; 4509 if (ConvTemplate) 4510 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4511 else 4512 Conv = cast<CXXConversionDecl>(D); 4513 4514 // If the conversion function doesn't return a reference type, 4515 // it can't be considered for this conversion. 4516 if (Conv->getConversionType()->isLValueReferenceType() && 4517 (AllowExplicit || !Conv->isExplicit())) { 4518 if (ConvTemplate) 4519 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4520 Init, DeclType, CandidateSet); 4521 else 4522 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4523 DeclType, CandidateSet); 4524 } 4525 } 4526 4527 OverloadCandidateSet::iterator Best; 4528 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4529 case OR_Success: 4530 // C++ [over.ics.ref]p1: 4531 // 4532 // [...] If the parameter binds directly to the result of 4533 // applying a conversion function to the argument 4534 // expression, the implicit conversion sequence is a 4535 // user-defined conversion sequence (13.3.3.1.2), with the 4536 // second standard conversion sequence either an identity 4537 // conversion or, if the conversion function returns an 4538 // entity of a type that is a derived class of the parameter 4539 // type, a derived-to-base Conversion. 4540 if (!Best->FinalConversion.DirectBinding) 4541 break; 4542 4543 // This is a direct binding. 4544 BindsDirectly = true; 4545 4546 if (ICS) { 4547 ICS->setUserDefined(); 4548 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4549 ICS->UserDefined.After = Best->FinalConversion; 4550 ICS->UserDefined.ConversionFunction = Best->Function; 4551 ICS->UserDefined.EllipsisConversion = false; 4552 assert(ICS->UserDefined.After.ReferenceBinding && 4553 ICS->UserDefined.After.DirectBinding && 4554 "Expected a direct reference binding!"); 4555 return false; 4556 } else { 4557 OwningExprResult InitConversion = 4558 BuildCXXCastArgument(DeclLoc, QualType(), 4559 CastExpr::CK_UserDefinedConversion, 4560 cast<CXXMethodDecl>(Best->Function), 4561 Owned(Init)); 4562 Init = InitConversion.takeAs<Expr>(); 4563 4564 if (CheckExceptionSpecCompatibility(Init, T1)) 4565 return true; 4566 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4567 /*isLvalue=*/true); 4568 } 4569 break; 4570 4571 case OR_Ambiguous: 4572 if (ICS) { 4573 ICS->setAmbiguous(); 4574 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4575 Cand != CandidateSet.end(); ++Cand) 4576 if (Cand->Viable) 4577 ICS->Ambiguous.addConversion(Cand->Function); 4578 break; 4579 } 4580 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4581 << Init->getSourceRange(); 4582 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4583 return true; 4584 4585 case OR_No_Viable_Function: 4586 case OR_Deleted: 4587 // There was no suitable conversion, or we found a deleted 4588 // conversion; continue with other checks. 4589 break; 4590 } 4591 } 4592 4593 if (BindsDirectly) { 4594 // C++ [dcl.init.ref]p4: 4595 // [...] In all cases where the reference-related or 4596 // reference-compatible relationship of two types is used to 4597 // establish the validity of a reference binding, and T1 is a 4598 // base class of T2, a program that necessitates such a binding 4599 // is ill-formed if T1 is an inaccessible (clause 11) or 4600 // ambiguous (10.2) base class of T2. 4601 // 4602 // Note that we only check this condition when we're allowed to 4603 // complain about errors, because we should not be checking for 4604 // ambiguity (or inaccessibility) unless the reference binding 4605 // actually happens. 4606 if (DerivedToBase) 4607 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4608 Init->getSourceRange(), 4609 IgnoreBaseAccess); 4610 else 4611 return false; 4612 } 4613 4614 // -- Otherwise, the reference shall be to a non-volatile const 4615 // type (i.e., cv1 shall be const), or the reference shall be an 4616 // rvalue reference and the initializer expression shall be an rvalue. 4617 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4618 if (!ICS) 4619 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4620 << T1.isVolatileQualified() 4621 << T1 << int(InitLvalue != Expr::LV_Valid) 4622 << T2 << Init->getSourceRange(); 4623 return true; 4624 } 4625 4626 // -- If the initializer expression is an rvalue, with T2 a 4627 // class type, and "cv1 T1" is reference-compatible with 4628 // "cv2 T2," the reference is bound in one of the 4629 // following ways (the choice is implementation-defined): 4630 // 4631 // -- The reference is bound to the object represented by 4632 // the rvalue (see 3.10) or to a sub-object within that 4633 // object. 4634 // 4635 // -- A temporary of type "cv1 T2" [sic] is created, and 4636 // a constructor is called to copy the entire rvalue 4637 // object into the temporary. The reference is bound to 4638 // the temporary or to a sub-object within the 4639 // temporary. 4640 // 4641 // The constructor that would be used to make the copy 4642 // shall be callable whether or not the copy is actually 4643 // done. 4644 // 4645 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4646 // freedom, so we will always take the first option and never build 4647 // a temporary in this case. FIXME: We will, however, have to check 4648 // for the presence of a copy constructor in C++98/03 mode. 4649 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4650 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4651 if (ICS) { 4652 ICS->setStandard(); 4653 ICS->Standard.First = ICK_Identity; 4654 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4655 ICS->Standard.Third = ICK_Identity; 4656 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4657 ICS->Standard.setToType(0, T2); 4658 ICS->Standard.setToType(1, T1); 4659 ICS->Standard.setToType(2, T1); 4660 ICS->Standard.ReferenceBinding = true; 4661 ICS->Standard.DirectBinding = false; 4662 ICS->Standard.RRefBinding = isRValRef; 4663 ICS->Standard.CopyConstructor = 0; 4664 } else { 4665 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4666 if (DerivedToBase) 4667 CK = CastExpr::CK_DerivedToBase; 4668 else if(CheckExceptionSpecCompatibility(Init, T1)) 4669 return true; 4670 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4671 } 4672 return false; 4673 } 4674 4675 // -- Otherwise, a temporary of type "cv1 T1" is created and 4676 // initialized from the initializer expression using the 4677 // rules for a non-reference copy initialization (8.5). The 4678 // reference is then bound to the temporary. If T1 is 4679 // reference-related to T2, cv1 must be the same 4680 // cv-qualification as, or greater cv-qualification than, 4681 // cv2; otherwise, the program is ill-formed. 4682 if (RefRelationship == Ref_Related) { 4683 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4684 // we would be reference-compatible or reference-compatible with 4685 // added qualification. But that wasn't the case, so the reference 4686 // initialization fails. 4687 if (!ICS) 4688 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4689 << T1 << int(InitLvalue != Expr::LV_Valid) 4690 << T2 << Init->getSourceRange(); 4691 return true; 4692 } 4693 4694 // If at least one of the types is a class type, the types are not 4695 // related, and we aren't allowed any user conversions, the 4696 // reference binding fails. This case is important for breaking 4697 // recursion, since TryImplicitConversion below will attempt to 4698 // create a temporary through the use of a copy constructor. 4699 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4700 (T1->isRecordType() || T2->isRecordType())) { 4701 if (!ICS) 4702 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4703 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4704 return true; 4705 } 4706 4707 // Actually try to convert the initializer to T1. 4708 if (ICS) { 4709 // C++ [over.ics.ref]p2: 4710 // 4711 // When a parameter of reference type is not bound directly to 4712 // an argument expression, the conversion sequence is the one 4713 // required to convert the argument expression to the 4714 // underlying type of the reference according to 4715 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4716 // to copy-initializing a temporary of the underlying type with 4717 // the argument expression. Any difference in top-level 4718 // cv-qualification is subsumed by the initialization itself 4719 // and does not constitute a conversion. 4720 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4721 /*AllowExplicit=*/false, 4722 /*ForceRValue=*/false, 4723 /*InOverloadResolution=*/false); 4724 4725 // Of course, that's still a reference binding. 4726 if (ICS->isStandard()) { 4727 ICS->Standard.ReferenceBinding = true; 4728 ICS->Standard.RRefBinding = isRValRef; 4729 } else if (ICS->isUserDefined()) { 4730 ICS->UserDefined.After.ReferenceBinding = true; 4731 ICS->UserDefined.After.RRefBinding = isRValRef; 4732 } 4733 return ICS->isBad(); 4734 } else { 4735 ImplicitConversionSequence Conversions; 4736 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4737 false, false, 4738 Conversions); 4739 if (badConversion) { 4740 if (Conversions.isAmbiguous()) { 4741 Diag(DeclLoc, 4742 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4743 for (int j = Conversions.Ambiguous.conversions().size()-1; 4744 j >= 0; j--) { 4745 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4746 NoteOverloadCandidate(Func); 4747 } 4748 } 4749 else { 4750 if (isRValRef) 4751 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4752 << Init->getSourceRange(); 4753 else 4754 Diag(DeclLoc, diag::err_invalid_initialization) 4755 << DeclType << Init->getType() << Init->getSourceRange(); 4756 } 4757 } 4758 return badConversion; 4759 } 4760} 4761 4762static inline bool 4763CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4764 const FunctionDecl *FnDecl) { 4765 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4766 if (isa<NamespaceDecl>(DC)) { 4767 return SemaRef.Diag(FnDecl->getLocation(), 4768 diag::err_operator_new_delete_declared_in_namespace) 4769 << FnDecl->getDeclName(); 4770 } 4771 4772 if (isa<TranslationUnitDecl>(DC) && 4773 FnDecl->getStorageClass() == FunctionDecl::Static) { 4774 return SemaRef.Diag(FnDecl->getLocation(), 4775 diag::err_operator_new_delete_declared_static) 4776 << FnDecl->getDeclName(); 4777 } 4778 4779 return false; 4780} 4781 4782static inline bool 4783CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4784 CanQualType ExpectedResultType, 4785 CanQualType ExpectedFirstParamType, 4786 unsigned DependentParamTypeDiag, 4787 unsigned InvalidParamTypeDiag) { 4788 QualType ResultType = 4789 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4790 4791 // Check that the result type is not dependent. 4792 if (ResultType->isDependentType()) 4793 return SemaRef.Diag(FnDecl->getLocation(), 4794 diag::err_operator_new_delete_dependent_result_type) 4795 << FnDecl->getDeclName() << ExpectedResultType; 4796 4797 // Check that the result type is what we expect. 4798 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4799 return SemaRef.Diag(FnDecl->getLocation(), 4800 diag::err_operator_new_delete_invalid_result_type) 4801 << FnDecl->getDeclName() << ExpectedResultType; 4802 4803 // A function template must have at least 2 parameters. 4804 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4805 return SemaRef.Diag(FnDecl->getLocation(), 4806 diag::err_operator_new_delete_template_too_few_parameters) 4807 << FnDecl->getDeclName(); 4808 4809 // The function decl must have at least 1 parameter. 4810 if (FnDecl->getNumParams() == 0) 4811 return SemaRef.Diag(FnDecl->getLocation(), 4812 diag::err_operator_new_delete_too_few_parameters) 4813 << FnDecl->getDeclName(); 4814 4815 // Check the the first parameter type is not dependent. 4816 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4817 if (FirstParamType->isDependentType()) 4818 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4819 << FnDecl->getDeclName() << ExpectedFirstParamType; 4820 4821 // Check that the first parameter type is what we expect. 4822 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4823 ExpectedFirstParamType) 4824 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4825 << FnDecl->getDeclName() << ExpectedFirstParamType; 4826 4827 return false; 4828} 4829 4830static bool 4831CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4832 // C++ [basic.stc.dynamic.allocation]p1: 4833 // A program is ill-formed if an allocation function is declared in a 4834 // namespace scope other than global scope or declared static in global 4835 // scope. 4836 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4837 return true; 4838 4839 CanQualType SizeTy = 4840 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4841 4842 // C++ [basic.stc.dynamic.allocation]p1: 4843 // The return type shall be void*. The first parameter shall have type 4844 // std::size_t. 4845 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4846 SizeTy, 4847 diag::err_operator_new_dependent_param_type, 4848 diag::err_operator_new_param_type)) 4849 return true; 4850 4851 // C++ [basic.stc.dynamic.allocation]p1: 4852 // The first parameter shall not have an associated default argument. 4853 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4854 return SemaRef.Diag(FnDecl->getLocation(), 4855 diag::err_operator_new_default_arg) 4856 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4857 4858 return false; 4859} 4860 4861static bool 4862CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4863 // C++ [basic.stc.dynamic.deallocation]p1: 4864 // A program is ill-formed if deallocation functions are declared in a 4865 // namespace scope other than global scope or declared static in global 4866 // scope. 4867 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4868 return true; 4869 4870 // C++ [basic.stc.dynamic.deallocation]p2: 4871 // Each deallocation function shall return void and its first parameter 4872 // shall be void*. 4873 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4874 SemaRef.Context.VoidPtrTy, 4875 diag::err_operator_delete_dependent_param_type, 4876 diag::err_operator_delete_param_type)) 4877 return true; 4878 4879 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4880 if (FirstParamType->isDependentType()) 4881 return SemaRef.Diag(FnDecl->getLocation(), 4882 diag::err_operator_delete_dependent_param_type) 4883 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4884 4885 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4886 SemaRef.Context.VoidPtrTy) 4887 return SemaRef.Diag(FnDecl->getLocation(), 4888 diag::err_operator_delete_param_type) 4889 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4890 4891 return false; 4892} 4893 4894/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4895/// of this overloaded operator is well-formed. If so, returns false; 4896/// otherwise, emits appropriate diagnostics and returns true. 4897bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4898 assert(FnDecl && FnDecl->isOverloadedOperator() && 4899 "Expected an overloaded operator declaration"); 4900 4901 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4902 4903 // C++ [over.oper]p5: 4904 // The allocation and deallocation functions, operator new, 4905 // operator new[], operator delete and operator delete[], are 4906 // described completely in 3.7.3. The attributes and restrictions 4907 // found in the rest of this subclause do not apply to them unless 4908 // explicitly stated in 3.7.3. 4909 if (Op == OO_Delete || Op == OO_Array_Delete) 4910 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4911 4912 if (Op == OO_New || Op == OO_Array_New) 4913 return CheckOperatorNewDeclaration(*this, FnDecl); 4914 4915 // C++ [over.oper]p6: 4916 // An operator function shall either be a non-static member 4917 // function or be a non-member function and have at least one 4918 // parameter whose type is a class, a reference to a class, an 4919 // enumeration, or a reference to an enumeration. 4920 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4921 if (MethodDecl->isStatic()) 4922 return Diag(FnDecl->getLocation(), 4923 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4924 } else { 4925 bool ClassOrEnumParam = false; 4926 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4927 ParamEnd = FnDecl->param_end(); 4928 Param != ParamEnd; ++Param) { 4929 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4930 if (ParamType->isDependentType() || ParamType->isRecordType() || 4931 ParamType->isEnumeralType()) { 4932 ClassOrEnumParam = true; 4933 break; 4934 } 4935 } 4936 4937 if (!ClassOrEnumParam) 4938 return Diag(FnDecl->getLocation(), 4939 diag::err_operator_overload_needs_class_or_enum) 4940 << FnDecl->getDeclName(); 4941 } 4942 4943 // C++ [over.oper]p8: 4944 // An operator function cannot have default arguments (8.3.6), 4945 // except where explicitly stated below. 4946 // 4947 // Only the function-call operator allows default arguments 4948 // (C++ [over.call]p1). 4949 if (Op != OO_Call) { 4950 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4951 Param != FnDecl->param_end(); ++Param) { 4952 if ((*Param)->hasDefaultArg()) 4953 return Diag((*Param)->getLocation(), 4954 diag::err_operator_overload_default_arg) 4955 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4956 } 4957 } 4958 4959 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4960 { false, false, false } 4961#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4962 , { Unary, Binary, MemberOnly } 4963#include "clang/Basic/OperatorKinds.def" 4964 }; 4965 4966 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4967 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4968 bool MustBeMemberOperator = OperatorUses[Op][2]; 4969 4970 // C++ [over.oper]p8: 4971 // [...] Operator functions cannot have more or fewer parameters 4972 // than the number required for the corresponding operator, as 4973 // described in the rest of this subclause. 4974 unsigned NumParams = FnDecl->getNumParams() 4975 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4976 if (Op != OO_Call && 4977 ((NumParams == 1 && !CanBeUnaryOperator) || 4978 (NumParams == 2 && !CanBeBinaryOperator) || 4979 (NumParams < 1) || (NumParams > 2))) { 4980 // We have the wrong number of parameters. 4981 unsigned ErrorKind; 4982 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4983 ErrorKind = 2; // 2 -> unary or binary. 4984 } else if (CanBeUnaryOperator) { 4985 ErrorKind = 0; // 0 -> unary 4986 } else { 4987 assert(CanBeBinaryOperator && 4988 "All non-call overloaded operators are unary or binary!"); 4989 ErrorKind = 1; // 1 -> binary 4990 } 4991 4992 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4993 << FnDecl->getDeclName() << NumParams << ErrorKind; 4994 } 4995 4996 // Overloaded operators other than operator() cannot be variadic. 4997 if (Op != OO_Call && 4998 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4999 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5000 << FnDecl->getDeclName(); 5001 } 5002 5003 // Some operators must be non-static member functions. 5004 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5005 return Diag(FnDecl->getLocation(), 5006 diag::err_operator_overload_must_be_member) 5007 << FnDecl->getDeclName(); 5008 } 5009 5010 // C++ [over.inc]p1: 5011 // The user-defined function called operator++ implements the 5012 // prefix and postfix ++ operator. If this function is a member 5013 // function with no parameters, or a non-member function with one 5014 // parameter of class or enumeration type, it defines the prefix 5015 // increment operator ++ for objects of that type. If the function 5016 // is a member function with one parameter (which shall be of type 5017 // int) or a non-member function with two parameters (the second 5018 // of which shall be of type int), it defines the postfix 5019 // increment operator ++ for objects of that type. 5020 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5021 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5022 bool ParamIsInt = false; 5023 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5024 ParamIsInt = BT->getKind() == BuiltinType::Int; 5025 5026 if (!ParamIsInt) 5027 return Diag(LastParam->getLocation(), 5028 diag::err_operator_overload_post_incdec_must_be_int) 5029 << LastParam->getType() << (Op == OO_MinusMinus); 5030 } 5031 5032 // Notify the class if it got an assignment operator. 5033 if (Op == OO_Equal) { 5034 // Would have returned earlier otherwise. 5035 assert(isa<CXXMethodDecl>(FnDecl) && 5036 "Overloaded = not member, but not filtered."); 5037 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5038 Method->getParent()->addedAssignmentOperator(Context, Method); 5039 } 5040 5041 return false; 5042} 5043 5044/// CheckLiteralOperatorDeclaration - Check whether the declaration 5045/// of this literal operator function is well-formed. If so, returns 5046/// false; otherwise, emits appropriate diagnostics and returns true. 5047bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5048 DeclContext *DC = FnDecl->getDeclContext(); 5049 Decl::Kind Kind = DC->getDeclKind(); 5050 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5051 Kind != Decl::LinkageSpec) { 5052 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5053 << FnDecl->getDeclName(); 5054 return true; 5055 } 5056 5057 bool Valid = false; 5058 5059 // FIXME: Check for the one valid template signature 5060 // template <char...> type operator "" name(); 5061 5062 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5063 // Check the first parameter 5064 QualType T = (*Param)->getType(); 5065 5066 // unsigned long long int and long double are allowed, but only 5067 // alone. 5068 // We also allow any character type; their omission seems to be a bug 5069 // in n3000 5070 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5071 Context.hasSameType(T, Context.LongDoubleTy) || 5072 Context.hasSameType(T, Context.CharTy) || 5073 Context.hasSameType(T, Context.WCharTy) || 5074 Context.hasSameType(T, Context.Char16Ty) || 5075 Context.hasSameType(T, Context.Char32Ty)) { 5076 if (++Param == FnDecl->param_end()) 5077 Valid = true; 5078 goto FinishedParams; 5079 } 5080 5081 // Otherwise it must be a pointer to const; let's strip those. 5082 const PointerType *PT = T->getAs<PointerType>(); 5083 if (!PT) 5084 goto FinishedParams; 5085 T = PT->getPointeeType(); 5086 if (!T.isConstQualified()) 5087 goto FinishedParams; 5088 T = T.getUnqualifiedType(); 5089 5090 // Move on to the second parameter; 5091 ++Param; 5092 5093 // If there is no second parameter, the first must be a const char * 5094 if (Param == FnDecl->param_end()) { 5095 if (Context.hasSameType(T, Context.CharTy)) 5096 Valid = true; 5097 goto FinishedParams; 5098 } 5099 5100 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5101 // are allowed as the first parameter to a two-parameter function 5102 if (!(Context.hasSameType(T, Context.CharTy) || 5103 Context.hasSameType(T, Context.WCharTy) || 5104 Context.hasSameType(T, Context.Char16Ty) || 5105 Context.hasSameType(T, Context.Char32Ty))) 5106 goto FinishedParams; 5107 5108 // The second and final parameter must be an std::size_t 5109 T = (*Param)->getType().getUnqualifiedType(); 5110 if (Context.hasSameType(T, Context.getSizeType()) && 5111 ++Param == FnDecl->param_end()) 5112 Valid = true; 5113 } 5114 5115 // FIXME: This diagnostic is absolutely terrible. 5116FinishedParams: 5117 if (!Valid) { 5118 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5119 << FnDecl->getDeclName(); 5120 return true; 5121 } 5122 5123 return false; 5124} 5125 5126/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5127/// linkage specification, including the language and (if present) 5128/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5129/// the location of the language string literal, which is provided 5130/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5131/// the '{' brace. Otherwise, this linkage specification does not 5132/// have any braces. 5133Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5134 SourceLocation ExternLoc, 5135 SourceLocation LangLoc, 5136 const char *Lang, 5137 unsigned StrSize, 5138 SourceLocation LBraceLoc) { 5139 LinkageSpecDecl::LanguageIDs Language; 5140 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5141 Language = LinkageSpecDecl::lang_c; 5142 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5143 Language = LinkageSpecDecl::lang_cxx; 5144 else { 5145 Diag(LangLoc, diag::err_bad_language); 5146 return DeclPtrTy(); 5147 } 5148 5149 // FIXME: Add all the various semantics of linkage specifications 5150 5151 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5152 LangLoc, Language, 5153 LBraceLoc.isValid()); 5154 CurContext->addDecl(D); 5155 PushDeclContext(S, D); 5156 return DeclPtrTy::make(D); 5157} 5158 5159/// ActOnFinishLinkageSpecification - Completely the definition of 5160/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5161/// valid, it's the position of the closing '}' brace in a linkage 5162/// specification that uses braces. 5163Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5164 DeclPtrTy LinkageSpec, 5165 SourceLocation RBraceLoc) { 5166 if (LinkageSpec) 5167 PopDeclContext(); 5168 return LinkageSpec; 5169} 5170 5171/// \brief Perform semantic analysis for the variable declaration that 5172/// occurs within a C++ catch clause, returning the newly-created 5173/// variable. 5174VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5175 TypeSourceInfo *TInfo, 5176 IdentifierInfo *Name, 5177 SourceLocation Loc, 5178 SourceRange Range) { 5179 bool Invalid = false; 5180 5181 // Arrays and functions decay. 5182 if (ExDeclType->isArrayType()) 5183 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5184 else if (ExDeclType->isFunctionType()) 5185 ExDeclType = Context.getPointerType(ExDeclType); 5186 5187 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5188 // The exception-declaration shall not denote a pointer or reference to an 5189 // incomplete type, other than [cv] void*. 5190 // N2844 forbids rvalue references. 5191 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5192 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5193 Invalid = true; 5194 } 5195 5196 // GCC allows catching pointers and references to incomplete types 5197 // as an extension; so do we, but we warn by default. 5198 5199 QualType BaseType = ExDeclType; 5200 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5201 unsigned DK = diag::err_catch_incomplete; 5202 bool IncompleteCatchIsInvalid = true; 5203 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5204 BaseType = Ptr->getPointeeType(); 5205 Mode = 1; 5206 DK = diag::ext_catch_incomplete_ptr; 5207 IncompleteCatchIsInvalid = false; 5208 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5209 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5210 BaseType = Ref->getPointeeType(); 5211 Mode = 2; 5212 DK = diag::ext_catch_incomplete_ref; 5213 IncompleteCatchIsInvalid = false; 5214 } 5215 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5216 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5217 IncompleteCatchIsInvalid) 5218 Invalid = true; 5219 5220 if (!Invalid && !ExDeclType->isDependentType() && 5221 RequireNonAbstractType(Loc, ExDeclType, 5222 diag::err_abstract_type_in_decl, 5223 AbstractVariableType)) 5224 Invalid = true; 5225 5226 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5227 Name, ExDeclType, TInfo, VarDecl::None); 5228 5229 if (!Invalid) { 5230 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5231 // C++ [except.handle]p16: 5232 // The object declared in an exception-declaration or, if the 5233 // exception-declaration does not specify a name, a temporary (12.2) is 5234 // copy-initialized (8.5) from the exception object. [...] 5235 // The object is destroyed when the handler exits, after the destruction 5236 // of any automatic objects initialized within the handler. 5237 // 5238 // We just pretend to initialize the object with itself, then make sure 5239 // it can be destroyed later. 5240 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5241 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5242 Loc, ExDeclType, 0); 5243 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5244 SourceLocation()); 5245 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5246 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5247 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5248 if (Result.isInvalid()) 5249 Invalid = true; 5250 else 5251 FinalizeVarWithDestructor(ExDecl, RecordTy); 5252 } 5253 } 5254 5255 if (Invalid) 5256 ExDecl->setInvalidDecl(); 5257 5258 return ExDecl; 5259} 5260 5261/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5262/// handler. 5263Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5264 TypeSourceInfo *TInfo = 0; 5265 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5266 5267 bool Invalid = D.isInvalidType(); 5268 IdentifierInfo *II = D.getIdentifier(); 5269 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5270 // The scope should be freshly made just for us. There is just no way 5271 // it contains any previous declaration. 5272 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5273 if (PrevDecl->isTemplateParameter()) { 5274 // Maybe we will complain about the shadowed template parameter. 5275 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5276 } 5277 } 5278 5279 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5280 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5281 << D.getCXXScopeSpec().getRange(); 5282 Invalid = true; 5283 } 5284 5285 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5286 D.getIdentifier(), 5287 D.getIdentifierLoc(), 5288 D.getDeclSpec().getSourceRange()); 5289 5290 if (Invalid) 5291 ExDecl->setInvalidDecl(); 5292 5293 // Add the exception declaration into this scope. 5294 if (II) 5295 PushOnScopeChains(ExDecl, S); 5296 else 5297 CurContext->addDecl(ExDecl); 5298 5299 ProcessDeclAttributes(S, ExDecl, D); 5300 return DeclPtrTy::make(ExDecl); 5301} 5302 5303Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5304 ExprArg assertexpr, 5305 ExprArg assertmessageexpr) { 5306 Expr *AssertExpr = (Expr *)assertexpr.get(); 5307 StringLiteral *AssertMessage = 5308 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5309 5310 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5311 llvm::APSInt Value(32); 5312 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5313 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5314 AssertExpr->getSourceRange(); 5315 return DeclPtrTy(); 5316 } 5317 5318 if (Value == 0) { 5319 Diag(AssertLoc, diag::err_static_assert_failed) 5320 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5321 } 5322 } 5323 5324 assertexpr.release(); 5325 assertmessageexpr.release(); 5326 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5327 AssertExpr, AssertMessage); 5328 5329 CurContext->addDecl(Decl); 5330 return DeclPtrTy::make(Decl); 5331} 5332 5333/// Handle a friend type declaration. This works in tandem with 5334/// ActOnTag. 5335/// 5336/// Notes on friend class templates: 5337/// 5338/// We generally treat friend class declarations as if they were 5339/// declaring a class. So, for example, the elaborated type specifier 5340/// in a friend declaration is required to obey the restrictions of a 5341/// class-head (i.e. no typedefs in the scope chain), template 5342/// parameters are required to match up with simple template-ids, &c. 5343/// However, unlike when declaring a template specialization, it's 5344/// okay to refer to a template specialization without an empty 5345/// template parameter declaration, e.g. 5346/// friend class A<T>::B<unsigned>; 5347/// We permit this as a special case; if there are any template 5348/// parameters present at all, require proper matching, i.e. 5349/// template <> template <class T> friend class A<int>::B; 5350Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5351 MultiTemplateParamsArg TempParams) { 5352 SourceLocation Loc = DS.getSourceRange().getBegin(); 5353 5354 assert(DS.isFriendSpecified()); 5355 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5356 5357 // Try to convert the decl specifier to a type. This works for 5358 // friend templates because ActOnTag never produces a ClassTemplateDecl 5359 // for a TUK_Friend. 5360 Declarator TheDeclarator(DS, Declarator::MemberContext); 5361 TypeSourceInfo *TSI; 5362 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5363 if (TheDeclarator.isInvalidType()) 5364 return DeclPtrTy(); 5365 5366 // This is definitely an error in C++98. It's probably meant to 5367 // be forbidden in C++0x, too, but the specification is just 5368 // poorly written. 5369 // 5370 // The problem is with declarations like the following: 5371 // template <T> friend A<T>::foo; 5372 // where deciding whether a class C is a friend or not now hinges 5373 // on whether there exists an instantiation of A that causes 5374 // 'foo' to equal C. There are restrictions on class-heads 5375 // (which we declare (by fiat) elaborated friend declarations to 5376 // be) that makes this tractable. 5377 // 5378 // FIXME: handle "template <> friend class A<T>;", which 5379 // is possibly well-formed? Who even knows? 5380 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5381 Diag(Loc, diag::err_tagless_friend_type_template) 5382 << DS.getSourceRange(); 5383 return DeclPtrTy(); 5384 } 5385 5386 // C++ [class.friend]p2: 5387 // An elaborated-type-specifier shall be used in a friend declaration 5388 // for a class.* 5389 // * The class-key of the elaborated-type-specifier is required. 5390 // This is one of the rare places in Clang where it's legitimate to 5391 // ask about the "spelling" of the type. 5392 if (!getLangOptions().CPlusPlus0x && !T->isElaboratedTypeSpecifier()) { 5393 // If we evaluated the type to a record type, suggest putting 5394 // a tag in front. 5395 if (const RecordType *RT = T->getAs<RecordType>()) { 5396 RecordDecl *RD = RT->getDecl(); 5397 5398 std::string InsertionText = std::string(" ") + RD->getKindName(); 5399 5400 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5401 << (unsigned) RD->getTagKind() 5402 << T 5403 << SourceRange(DS.getFriendSpecLoc()) 5404 << FixItHint::CreateInsertion(DS.getTypeSpecTypeLoc(), InsertionText); 5405 return DeclPtrTy(); 5406 }else { 5407 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5408 << DS.getSourceRange(); 5409 return DeclPtrTy(); 5410 } 5411 } 5412 5413 // Enum types cannot be friends. 5414 if (T->getAs<EnumType>()) { 5415 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5416 << SourceRange(DS.getFriendSpecLoc()); 5417 return DeclPtrTy(); 5418 } 5419 5420 // C++98 [class.friend]p1: A friend of a class is a function 5421 // or class that is not a member of the class . . . 5422 // This is fixed in DR77, which just barely didn't make the C++03 5423 // deadline. It's also a very silly restriction that seriously 5424 // affects inner classes and which nobody else seems to implement; 5425 // thus we never diagnose it, not even in -pedantic. 5426 // 5427 // But note that we could warn about it: it's always useless to 5428 // friend one of your own members (it's not, however, worthless to 5429 // friend a member of an arbitrary specialization of your template). 5430 5431 Decl *D; 5432 if (TempParams.size()) 5433 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5434 TempParams.size(), 5435 (TemplateParameterList**) TempParams.release(), 5436 TSI, 5437 DS.getFriendSpecLoc()); 5438 else 5439 D = FriendDecl::Create(Context, CurContext, Loc, TSI, 5440 DS.getFriendSpecLoc()); 5441 D->setAccess(AS_public); 5442 CurContext->addDecl(D); 5443 5444 return DeclPtrTy::make(D); 5445} 5446 5447Sema::DeclPtrTy 5448Sema::ActOnFriendFunctionDecl(Scope *S, 5449 Declarator &D, 5450 bool IsDefinition, 5451 MultiTemplateParamsArg TemplateParams) { 5452 const DeclSpec &DS = D.getDeclSpec(); 5453 5454 assert(DS.isFriendSpecified()); 5455 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5456 5457 SourceLocation Loc = D.getIdentifierLoc(); 5458 TypeSourceInfo *TInfo = 0; 5459 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5460 5461 // C++ [class.friend]p1 5462 // A friend of a class is a function or class.... 5463 // Note that this sees through typedefs, which is intended. 5464 // It *doesn't* see through dependent types, which is correct 5465 // according to [temp.arg.type]p3: 5466 // If a declaration acquires a function type through a 5467 // type dependent on a template-parameter and this causes 5468 // a declaration that does not use the syntactic form of a 5469 // function declarator to have a function type, the program 5470 // is ill-formed. 5471 if (!T->isFunctionType()) { 5472 Diag(Loc, diag::err_unexpected_friend); 5473 5474 // It might be worthwhile to try to recover by creating an 5475 // appropriate declaration. 5476 return DeclPtrTy(); 5477 } 5478 5479 // C++ [namespace.memdef]p3 5480 // - If a friend declaration in a non-local class first declares a 5481 // class or function, the friend class or function is a member 5482 // of the innermost enclosing namespace. 5483 // - The name of the friend is not found by simple name lookup 5484 // until a matching declaration is provided in that namespace 5485 // scope (either before or after the class declaration granting 5486 // friendship). 5487 // - If a friend function is called, its name may be found by the 5488 // name lookup that considers functions from namespaces and 5489 // classes associated with the types of the function arguments. 5490 // - When looking for a prior declaration of a class or a function 5491 // declared as a friend, scopes outside the innermost enclosing 5492 // namespace scope are not considered. 5493 5494 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5495 DeclarationName Name = GetNameForDeclarator(D); 5496 assert(Name); 5497 5498 // The context we found the declaration in, or in which we should 5499 // create the declaration. 5500 DeclContext *DC; 5501 5502 // FIXME: handle local classes 5503 5504 // Recover from invalid scope qualifiers as if they just weren't there. 5505 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5506 ForRedeclaration); 5507 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5508 // FIXME: RequireCompleteDeclContext 5509 DC = computeDeclContext(ScopeQual); 5510 5511 // FIXME: handle dependent contexts 5512 if (!DC) return DeclPtrTy(); 5513 5514 LookupQualifiedName(Previous, DC); 5515 5516 // If searching in that context implicitly found a declaration in 5517 // a different context, treat it like it wasn't found at all. 5518 // TODO: better diagnostics for this case. Suggesting the right 5519 // qualified scope would be nice... 5520 // FIXME: getRepresentativeDecl() is not right here at all 5521 if (Previous.empty() || 5522 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5523 D.setInvalidType(); 5524 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5525 return DeclPtrTy(); 5526 } 5527 5528 // C++ [class.friend]p1: A friend of a class is a function or 5529 // class that is not a member of the class . . . 5530 if (DC->Equals(CurContext)) 5531 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5532 5533 // Otherwise walk out to the nearest namespace scope looking for matches. 5534 } else { 5535 // TODO: handle local class contexts. 5536 5537 DC = CurContext; 5538 while (true) { 5539 // Skip class contexts. If someone can cite chapter and verse 5540 // for this behavior, that would be nice --- it's what GCC and 5541 // EDG do, and it seems like a reasonable intent, but the spec 5542 // really only says that checks for unqualified existing 5543 // declarations should stop at the nearest enclosing namespace, 5544 // not that they should only consider the nearest enclosing 5545 // namespace. 5546 while (DC->isRecord()) 5547 DC = DC->getParent(); 5548 5549 LookupQualifiedName(Previous, DC); 5550 5551 // TODO: decide what we think about using declarations. 5552 if (!Previous.empty()) 5553 break; 5554 5555 if (DC->isFileContext()) break; 5556 DC = DC->getParent(); 5557 } 5558 5559 // C++ [class.friend]p1: A friend of a class is a function or 5560 // class that is not a member of the class . . . 5561 // C++0x changes this for both friend types and functions. 5562 // Most C++ 98 compilers do seem to give an error here, so 5563 // we do, too. 5564 if (!Previous.empty() && DC->Equals(CurContext) 5565 && !getLangOptions().CPlusPlus0x) 5566 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5567 } 5568 5569 if (DC->isFileContext()) { 5570 // This implies that it has to be an operator or function. 5571 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5572 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5573 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5574 Diag(Loc, diag::err_introducing_special_friend) << 5575 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5576 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5577 return DeclPtrTy(); 5578 } 5579 } 5580 5581 bool Redeclaration = false; 5582 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5583 move(TemplateParams), 5584 IsDefinition, 5585 Redeclaration); 5586 if (!ND) return DeclPtrTy(); 5587 5588 assert(ND->getDeclContext() == DC); 5589 assert(ND->getLexicalDeclContext() == CurContext); 5590 5591 // Add the function declaration to the appropriate lookup tables, 5592 // adjusting the redeclarations list as necessary. We don't 5593 // want to do this yet if the friending class is dependent. 5594 // 5595 // Also update the scope-based lookup if the target context's 5596 // lookup context is in lexical scope. 5597 if (!CurContext->isDependentContext()) { 5598 DC = DC->getLookupContext(); 5599 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5600 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5601 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5602 } 5603 5604 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5605 D.getIdentifierLoc(), ND, 5606 DS.getFriendSpecLoc()); 5607 FrD->setAccess(AS_public); 5608 CurContext->addDecl(FrD); 5609 5610 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5611 FrD->setSpecialization(true); 5612 5613 return DeclPtrTy::make(ND); 5614} 5615 5616void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5617 AdjustDeclIfTemplate(dcl); 5618 5619 Decl *Dcl = dcl.getAs<Decl>(); 5620 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5621 if (!Fn) { 5622 Diag(DelLoc, diag::err_deleted_non_function); 5623 return; 5624 } 5625 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5626 Diag(DelLoc, diag::err_deleted_decl_not_first); 5627 Diag(Prev->getLocation(), diag::note_previous_declaration); 5628 // If the declaration wasn't the first, we delete the function anyway for 5629 // recovery. 5630 } 5631 Fn->setDeleted(); 5632} 5633 5634static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5635 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5636 ++CI) { 5637 Stmt *SubStmt = *CI; 5638 if (!SubStmt) 5639 continue; 5640 if (isa<ReturnStmt>(SubStmt)) 5641 Self.Diag(SubStmt->getSourceRange().getBegin(), 5642 diag::err_return_in_constructor_handler); 5643 if (!isa<Expr>(SubStmt)) 5644 SearchForReturnInStmt(Self, SubStmt); 5645 } 5646} 5647 5648void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5649 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5650 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5651 SearchForReturnInStmt(*this, Handler); 5652 } 5653} 5654 5655bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5656 const CXXMethodDecl *Old) { 5657 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5658 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5659 5660 if (Context.hasSameType(NewTy, OldTy) || 5661 NewTy->isDependentType() || OldTy->isDependentType()) 5662 return false; 5663 5664 // Check if the return types are covariant 5665 QualType NewClassTy, OldClassTy; 5666 5667 /// Both types must be pointers or references to classes. 5668 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5669 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5670 NewClassTy = NewPT->getPointeeType(); 5671 OldClassTy = OldPT->getPointeeType(); 5672 } 5673 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5674 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5675 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5676 NewClassTy = NewRT->getPointeeType(); 5677 OldClassTy = OldRT->getPointeeType(); 5678 } 5679 } 5680 } 5681 5682 // The return types aren't either both pointers or references to a class type. 5683 if (NewClassTy.isNull()) { 5684 Diag(New->getLocation(), 5685 diag::err_different_return_type_for_overriding_virtual_function) 5686 << New->getDeclName() << NewTy << OldTy; 5687 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5688 5689 return true; 5690 } 5691 5692 // C++ [class.virtual]p6: 5693 // If the return type of D::f differs from the return type of B::f, the 5694 // class type in the return type of D::f shall be complete at the point of 5695 // declaration of D::f or shall be the class type D. 5696 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5697 if (!RT->isBeingDefined() && 5698 RequireCompleteType(New->getLocation(), NewClassTy, 5699 PDiag(diag::err_covariant_return_incomplete) 5700 << New->getDeclName())) 5701 return true; 5702 } 5703 5704 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5705 // Check if the new class derives from the old class. 5706 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5707 Diag(New->getLocation(), 5708 diag::err_covariant_return_not_derived) 5709 << New->getDeclName() << NewTy << OldTy; 5710 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5711 return true; 5712 } 5713 5714 // Check if we the conversion from derived to base is valid. 5715 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5716 diag::err_covariant_return_inaccessible_base, 5717 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5718 // FIXME: Should this point to the return type? 5719 New->getLocation(), SourceRange(), New->getDeclName())) { 5720 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5721 return true; 5722 } 5723 } 5724 5725 // The qualifiers of the return types must be the same. 5726 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5727 Diag(New->getLocation(), 5728 diag::err_covariant_return_type_different_qualifications) 5729 << New->getDeclName() << NewTy << OldTy; 5730 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5731 return true; 5732 }; 5733 5734 5735 // The new class type must have the same or less qualifiers as the old type. 5736 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5737 Diag(New->getLocation(), 5738 diag::err_covariant_return_type_class_type_more_qualified) 5739 << New->getDeclName() << NewTy << OldTy; 5740 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5741 return true; 5742 }; 5743 5744 return false; 5745} 5746 5747bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5748 const CXXMethodDecl *Old) 5749{ 5750 if (Old->hasAttr<FinalAttr>()) { 5751 Diag(New->getLocation(), diag::err_final_function_overridden) 5752 << New->getDeclName(); 5753 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5754 return true; 5755 } 5756 5757 return false; 5758} 5759 5760/// \brief Mark the given method pure. 5761/// 5762/// \param Method the method to be marked pure. 5763/// 5764/// \param InitRange the source range that covers the "0" initializer. 5765bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5766 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5767 Method->setPure(); 5768 5769 // A class is abstract if at least one function is pure virtual. 5770 Method->getParent()->setAbstract(true); 5771 return false; 5772 } 5773 5774 if (!Method->isInvalidDecl()) 5775 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5776 << Method->getDeclName() << InitRange; 5777 return true; 5778} 5779 5780/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5781/// an initializer for the out-of-line declaration 'Dcl'. The scope 5782/// is a fresh scope pushed for just this purpose. 5783/// 5784/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5785/// static data member of class X, names should be looked up in the scope of 5786/// class X. 5787void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5788 // If there is no declaration, there was an error parsing it. 5789 Decl *D = Dcl.getAs<Decl>(); 5790 if (D == 0) return; 5791 5792 // We should only get called for declarations with scope specifiers, like: 5793 // int foo::bar; 5794 assert(D->isOutOfLine()); 5795 EnterDeclaratorContext(S, D->getDeclContext()); 5796} 5797 5798/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5799/// initializer for the out-of-line declaration 'Dcl'. 5800void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5801 // If there is no declaration, there was an error parsing it. 5802 Decl *D = Dcl.getAs<Decl>(); 5803 if (D == 0) return; 5804 5805 assert(D->isOutOfLine()); 5806 ExitDeclaratorContext(S); 5807} 5808 5809/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5810/// C++ if/switch/while/for statement. 5811/// e.g: "if (int x = f()) {...}" 5812Action::DeclResult 5813Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5814 // C++ 6.4p2: 5815 // The declarator shall not specify a function or an array. 5816 // The type-specifier-seq shall not contain typedef and shall not declare a 5817 // new class or enumeration. 5818 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5819 "Parser allowed 'typedef' as storage class of condition decl."); 5820 5821 TypeSourceInfo *TInfo = 0; 5822 TagDecl *OwnedTag = 0; 5823 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5824 5825 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5826 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5827 // would be created and CXXConditionDeclExpr wants a VarDecl. 5828 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5829 << D.getSourceRange(); 5830 return DeclResult(); 5831 } else if (OwnedTag && OwnedTag->isDefinition()) { 5832 // The type-specifier-seq shall not declare a new class or enumeration. 5833 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5834 } 5835 5836 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5837 if (!Dcl) 5838 return DeclResult(); 5839 5840 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5841 VD->setDeclaredInCondition(true); 5842 return Dcl; 5843} 5844 5845static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5846 // Ignore dependent types. 5847 if (MD->isDependentContext()) 5848 return false; 5849 5850 // Ignore declarations that are not definitions. 5851 if (!MD->isThisDeclarationADefinition()) 5852 return false; 5853 5854 CXXRecordDecl *RD = MD->getParent(); 5855 5856 // Ignore classes without a vtable. 5857 if (!RD->isDynamicClass()) 5858 return false; 5859 5860 switch (MD->getParent()->getTemplateSpecializationKind()) { 5861 case TSK_Undeclared: 5862 case TSK_ExplicitSpecialization: 5863 // Classes that aren't instantiations of templates don't need their 5864 // virtual methods marked until we see the definition of the key 5865 // function. 5866 break; 5867 5868 case TSK_ImplicitInstantiation: 5869 // This is a constructor of a class template; mark all of the virtual 5870 // members as referenced to ensure that they get instantiatied. 5871 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5872 return true; 5873 break; 5874 5875 case TSK_ExplicitInstantiationDeclaration: 5876 return false; 5877 5878 case TSK_ExplicitInstantiationDefinition: 5879 // This is method of a explicit instantiation; mark all of the virtual 5880 // members as referenced to ensure that they get instantiatied. 5881 return true; 5882 } 5883 5884 // Consider only out-of-line definitions of member functions. When we see 5885 // an inline definition, it's too early to compute the key function. 5886 if (!MD->isOutOfLine()) 5887 return false; 5888 5889 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5890 5891 // If there is no key function, we will need a copy of the vtable. 5892 if (!KeyFunction) 5893 return true; 5894 5895 // If this is the key function, we need to mark virtual members. 5896 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5897 return true; 5898 5899 return false; 5900} 5901 5902void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5903 CXXMethodDecl *MD) { 5904 CXXRecordDecl *RD = MD->getParent(); 5905 5906 // We will need to mark all of the virtual members as referenced to build the 5907 // vtable. 5908 if (!needsVtable(MD, Context)) 5909 return; 5910 5911 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5912 if (kind == TSK_ImplicitInstantiation) 5913 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5914 else 5915 MarkVirtualMembersReferenced(Loc, RD); 5916} 5917 5918bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5919 if (ClassesWithUnmarkedVirtualMembers.empty()) 5920 return false; 5921 5922 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5923 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5924 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5925 ClassesWithUnmarkedVirtualMembers.pop_back(); 5926 MarkVirtualMembersReferenced(Loc, RD); 5927 } 5928 5929 return true; 5930} 5931 5932void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5933 const CXXRecordDecl *RD) { 5934 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5935 e = RD->method_end(); i != e; ++i) { 5936 CXXMethodDecl *MD = *i; 5937 5938 // C++ [basic.def.odr]p2: 5939 // [...] A virtual member function is used if it is not pure. [...] 5940 if (MD->isVirtual() && !MD->isPure()) 5941 MarkDeclarationReferenced(Loc, MD); 5942 } 5943 5944 // Only classes that have virtual bases need a VTT. 5945 if (RD->getNumVBases() == 0) 5946 return; 5947 5948 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5949 e = RD->bases_end(); i != e; ++i) { 5950 const CXXRecordDecl *Base = 5951 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5952 if (i->isVirtual()) 5953 continue; 5954 if (Base->getNumVBases() == 0) 5955 continue; 5956 MarkVirtualMembersReferenced(Loc, Base); 5957 } 5958} 5959