SemaDeclCXX.cpp revision d1fed3e8595a15edd7e14cee166ef90634fcf141
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 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 // We don't want access-control diagnostics here. 1080 R.suppressDiagnostics(); 1081 1082 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1083 bool NotUnknownSpecialization = false; 1084 DeclContext *DC = computeDeclContext(SS, false); 1085 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1086 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1087 1088 if (!NotUnknownSpecialization) { 1089 // When the scope specifier can refer to a member of an unknown 1090 // specialization, we take it as a type name. 1091 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1092 *MemberOrBase, SS.getRange()); 1093 if (BaseType.isNull()) 1094 return true; 1095 1096 R.clear(); 1097 } 1098 } 1099 1100 // If no results were found, try to correct typos. 1101 if (R.empty() && BaseType.isNull() && 1102 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1103 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1104 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1105 // We have found a non-static data member with a similar 1106 // name to what was typed; complain and initialize that 1107 // member. 1108 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1109 << MemberOrBase << true << R.getLookupName() 1110 << FixItHint::CreateReplacement(R.getNameLoc(), 1111 R.getLookupName().getAsString()); 1112 Diag(Member->getLocation(), diag::note_previous_decl) 1113 << Member->getDeclName(); 1114 1115 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1116 LParenLoc, RParenLoc); 1117 } 1118 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1119 const CXXBaseSpecifier *DirectBaseSpec; 1120 const CXXBaseSpecifier *VirtualBaseSpec; 1121 if (FindBaseInitializer(*this, ClassDecl, 1122 Context.getTypeDeclType(Type), 1123 DirectBaseSpec, VirtualBaseSpec)) { 1124 // We have found a direct or virtual base class with a 1125 // similar name to what was typed; complain and initialize 1126 // that base class. 1127 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1128 << MemberOrBase << false << R.getLookupName() 1129 << FixItHint::CreateReplacement(R.getNameLoc(), 1130 R.getLookupName().getAsString()); 1131 1132 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1133 : VirtualBaseSpec; 1134 Diag(BaseSpec->getSourceRange().getBegin(), 1135 diag::note_base_class_specified_here) 1136 << BaseSpec->getType() 1137 << BaseSpec->getSourceRange(); 1138 1139 TyD = Type; 1140 } 1141 } 1142 } 1143 1144 if (!TyD && BaseType.isNull()) { 1145 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1146 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1147 return true; 1148 } 1149 } 1150 1151 if (BaseType.isNull()) { 1152 BaseType = Context.getTypeDeclType(TyD); 1153 if (SS.isSet()) { 1154 NestedNameSpecifier *Qualifier = 1155 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1156 1157 // FIXME: preserve source range information 1158 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1159 } 1160 } 1161 } 1162 1163 if (!TInfo) 1164 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1165 1166 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1167 LParenLoc, RParenLoc, ClassDecl); 1168} 1169 1170/// Checks an initializer expression for use of uninitialized fields, such as 1171/// containing the field that is being initialized. Returns true if there is an 1172/// uninitialized field was used an updates the SourceLocation parameter; false 1173/// otherwise. 1174static bool InitExprContainsUninitializedFields(const Stmt* S, 1175 const FieldDecl* LhsField, 1176 SourceLocation* L) { 1177 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1178 if (ME) { 1179 const NamedDecl* RhsField = ME->getMemberDecl(); 1180 if (RhsField == LhsField) { 1181 // Initializing a field with itself. Throw a warning. 1182 // But wait; there are exceptions! 1183 // Exception #1: The field may not belong to this record. 1184 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1185 const Expr* base = ME->getBase(); 1186 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1187 // Even though the field matches, it does not belong to this record. 1188 return false; 1189 } 1190 // None of the exceptions triggered; return true to indicate an 1191 // uninitialized field was used. 1192 *L = ME->getMemberLoc(); 1193 return true; 1194 } 1195 } 1196 bool found = false; 1197 for (Stmt::const_child_iterator it = S->child_begin(); 1198 it != S->child_end() && found == false; 1199 ++it) { 1200 if (isa<CallExpr>(S)) { 1201 // Do not descend into function calls or constructors, as the use 1202 // of an uninitialized field may be valid. One would have to inspect 1203 // the contents of the function/ctor to determine if it is safe or not. 1204 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1205 // may be safe, depending on what the function/ctor does. 1206 continue; 1207 } 1208 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1209 } 1210 return found; 1211} 1212 1213Sema::MemInitResult 1214Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1215 unsigned NumArgs, SourceLocation IdLoc, 1216 SourceLocation LParenLoc, 1217 SourceLocation RParenLoc) { 1218 // Diagnose value-uses of fields to initialize themselves, e.g. 1219 // foo(foo) 1220 // where foo is not also a parameter to the constructor. 1221 // TODO: implement -Wuninitialized and fold this into that framework. 1222 for (unsigned i = 0; i < NumArgs; ++i) { 1223 SourceLocation L; 1224 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1225 // FIXME: Return true in the case when other fields are used before being 1226 // uninitialized. For example, let this field be the i'th field. When 1227 // initializing the i'th field, throw a warning if any of the >= i'th 1228 // fields are used, as they are not yet initialized. 1229 // Right now we are only handling the case where the i'th field uses 1230 // itself in its initializer. 1231 Diag(L, diag::warn_field_is_uninit); 1232 } 1233 } 1234 1235 bool HasDependentArg = false; 1236 for (unsigned i = 0; i < NumArgs; i++) 1237 HasDependentArg |= Args[i]->isTypeDependent(); 1238 1239 QualType FieldType = Member->getType(); 1240 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1241 FieldType = Array->getElementType(); 1242 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1243 if (FieldType->isDependentType() || HasDependentArg) { 1244 // Can't check initialization for a member of dependent type or when 1245 // any of the arguments are type-dependent expressions. 1246 OwningExprResult Init 1247 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1248 RParenLoc)); 1249 1250 // Erase any temporaries within this evaluation context; we're not 1251 // going to track them in the AST, since we'll be rebuilding the 1252 // ASTs during template instantiation. 1253 ExprTemporaries.erase( 1254 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1255 ExprTemporaries.end()); 1256 1257 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1258 LParenLoc, 1259 Init.takeAs<Expr>(), 1260 RParenLoc); 1261 1262 } 1263 1264 if (Member->isInvalidDecl()) 1265 return true; 1266 1267 // Initialize the member. 1268 InitializedEntity MemberEntity = 1269 InitializedEntity::InitializeMember(Member, 0); 1270 InitializationKind Kind = 1271 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1272 1273 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1274 1275 OwningExprResult MemberInit = 1276 InitSeq.Perform(*this, MemberEntity, Kind, 1277 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1278 if (MemberInit.isInvalid()) 1279 return true; 1280 1281 // C++0x [class.base.init]p7: 1282 // The initialization of each base and member constitutes a 1283 // full-expression. 1284 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1285 if (MemberInit.isInvalid()) 1286 return true; 1287 1288 // If we are in a dependent context, template instantiation will 1289 // perform this type-checking again. Just save the arguments that we 1290 // received in a ParenListExpr. 1291 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1292 // of the information that we have about the member 1293 // initializer. However, deconstructing the ASTs is a dicey process, 1294 // and this approach is far more likely to get the corner cases right. 1295 if (CurContext->isDependentContext()) { 1296 // Bump the reference count of all of the arguments. 1297 for (unsigned I = 0; I != NumArgs; ++I) 1298 Args[I]->Retain(); 1299 1300 OwningExprResult Init 1301 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1302 RParenLoc)); 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init.takeAs<Expr>(), 1306 RParenLoc); 1307 } 1308 1309 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1310 LParenLoc, 1311 MemberInit.takeAs<Expr>(), 1312 RParenLoc); 1313} 1314 1315Sema::MemInitResult 1316Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1317 Expr **Args, unsigned NumArgs, 1318 SourceLocation LParenLoc, SourceLocation RParenLoc, 1319 CXXRecordDecl *ClassDecl) { 1320 bool HasDependentArg = false; 1321 for (unsigned i = 0; i < NumArgs; i++) 1322 HasDependentArg |= Args[i]->isTypeDependent(); 1323 1324 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1325 if (BaseType->isDependentType() || HasDependentArg) { 1326 // Can't check initialization for a base of dependent type or when 1327 // any of the arguments are type-dependent expressions. 1328 OwningExprResult BaseInit 1329 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1330 RParenLoc)); 1331 1332 // Erase any temporaries within this evaluation context; we're not 1333 // going to track them in the AST, since we'll be rebuilding the 1334 // ASTs during template instantiation. 1335 ExprTemporaries.erase( 1336 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1337 ExprTemporaries.end()); 1338 1339 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1340 /*IsVirtual=*/false, 1341 LParenLoc, 1342 BaseInit.takeAs<Expr>(), 1343 RParenLoc); 1344 } 1345 1346 if (!BaseType->isRecordType()) 1347 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1348 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1349 1350 // C++ [class.base.init]p2: 1351 // [...] Unless the mem-initializer-id names a nonstatic data 1352 // member of the constructor’s class or a direct or virtual base 1353 // of that class, the mem-initializer is ill-formed. A 1354 // mem-initializer-list can initialize a base class using any 1355 // name that denotes that base class type. 1356 1357 // Check for direct and virtual base classes. 1358 const CXXBaseSpecifier *DirectBaseSpec = 0; 1359 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1360 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1361 VirtualBaseSpec); 1362 1363 // C++ [base.class.init]p2: 1364 // If a mem-initializer-id is ambiguous because it designates both 1365 // a direct non-virtual base class and an inherited virtual base 1366 // class, the mem-initializer is ill-formed. 1367 if (DirectBaseSpec && VirtualBaseSpec) 1368 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1369 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1370 // C++ [base.class.init]p2: 1371 // Unless the mem-initializer-id names a nonstatic data membeer of the 1372 // constructor's class ot a direst or virtual base of that class, the 1373 // mem-initializer is ill-formed. 1374 if (!DirectBaseSpec && !VirtualBaseSpec) 1375 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1376 << BaseType << ClassDecl->getNameAsCString() 1377 << BaseTInfo->getTypeLoc().getSourceRange(); 1378 1379 CXXBaseSpecifier *BaseSpec 1380 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1381 if (!BaseSpec) 1382 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1383 1384 // Initialize the base. 1385 InitializedEntity BaseEntity = 1386 InitializedEntity::InitializeBase(Context, BaseSpec); 1387 InitializationKind Kind = 1388 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1389 1390 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1391 1392 OwningExprResult BaseInit = 1393 InitSeq.Perform(*this, BaseEntity, Kind, 1394 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1395 if (BaseInit.isInvalid()) 1396 return true; 1397 1398 // C++0x [class.base.init]p7: 1399 // The initialization of each base and member constitutes a 1400 // full-expression. 1401 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1402 if (BaseInit.isInvalid()) 1403 return true; 1404 1405 // If we are in a dependent context, template instantiation will 1406 // perform this type-checking again. Just save the arguments that we 1407 // received in a ParenListExpr. 1408 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1409 // of the information that we have about the base 1410 // initializer. However, deconstructing the ASTs is a dicey process, 1411 // and this approach is far more likely to get the corner cases right. 1412 if (CurContext->isDependentContext()) { 1413 // Bump the reference count of all of the arguments. 1414 for (unsigned I = 0; I != NumArgs; ++I) 1415 Args[I]->Retain(); 1416 1417 OwningExprResult Init 1418 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1419 RParenLoc)); 1420 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1421 BaseSpec->isVirtual(), 1422 LParenLoc, 1423 Init.takeAs<Expr>(), 1424 RParenLoc); 1425 } 1426 1427 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1428 BaseSpec->isVirtual(), 1429 LParenLoc, 1430 BaseInit.takeAs<Expr>(), 1431 RParenLoc); 1432} 1433 1434bool 1435Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1436 CXXBaseOrMemberInitializer **Initializers, 1437 unsigned NumInitializers, 1438 bool AnyErrors) { 1439 if (Constructor->getDeclContext()->isDependentContext()) { 1440 // Just store the initializers as written, they will be checked during 1441 // instantiation. 1442 if (NumInitializers > 0) { 1443 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1444 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1445 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1446 memcpy(baseOrMemberInitializers, Initializers, 1447 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1448 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1449 } 1450 1451 return false; 1452 } 1453 1454 // We need to build the initializer AST according to order of construction 1455 // and not what user specified in the Initializers list. 1456 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1457 if (!ClassDecl) 1458 return true; 1459 1460 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1461 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1462 bool HadError = false; 1463 1464 for (unsigned i = 0; i < NumInitializers; i++) { 1465 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1466 1467 if (Member->isBaseInitializer()) 1468 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1469 else 1470 AllBaseFields[Member->getMember()] = Member; 1471 } 1472 1473 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1474 1475 // Push virtual bases before others. 1476 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1477 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1478 1479 if (CXXBaseOrMemberInitializer *Value 1480 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1481 AllToInit.push_back(Value); 1482 } else if (!AnyErrors) { 1483 InitializedEntity InitEntity 1484 = InitializedEntity::InitializeBase(Context, VBase); 1485 InitializationKind InitKind 1486 = InitializationKind::CreateDefault(Constructor->getLocation()); 1487 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1488 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1489 MultiExprArg(*this, 0, 0)); 1490 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1491 if (BaseInit.isInvalid()) { 1492 HadError = true; 1493 continue; 1494 } 1495 1496 CXXBaseOrMemberInitializer *CXXBaseInit = 1497 new (Context) CXXBaseOrMemberInitializer(Context, 1498 Context.getTrivialTypeSourceInfo(VBase->getType(), 1499 SourceLocation()), 1500 /*IsVirtual=*/true, 1501 SourceLocation(), 1502 BaseInit.takeAs<Expr>(), 1503 SourceLocation()); 1504 AllToInit.push_back(CXXBaseInit); 1505 } 1506 } 1507 1508 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1509 E = ClassDecl->bases_end(); Base != E; ++Base) { 1510 // Virtuals are in the virtual base list and already constructed. 1511 if (Base->isVirtual()) 1512 continue; 1513 1514 if (CXXBaseOrMemberInitializer *Value 1515 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1516 AllToInit.push_back(Value); 1517 } else if (!AnyErrors) { 1518 InitializedEntity InitEntity 1519 = InitializedEntity::InitializeBase(Context, Base); 1520 InitializationKind InitKind 1521 = InitializationKind::CreateDefault(Constructor->getLocation()); 1522 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1523 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1524 MultiExprArg(*this, 0, 0)); 1525 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1526 if (BaseInit.isInvalid()) { 1527 HadError = true; 1528 continue; 1529 } 1530 1531 CXXBaseOrMemberInitializer *CXXBaseInit = 1532 new (Context) CXXBaseOrMemberInitializer(Context, 1533 Context.getTrivialTypeSourceInfo(Base->getType(), 1534 SourceLocation()), 1535 /*IsVirtual=*/false, 1536 SourceLocation(), 1537 BaseInit.takeAs<Expr>(), 1538 SourceLocation()); 1539 AllToInit.push_back(CXXBaseInit); 1540 } 1541 } 1542 1543 // non-static data members. 1544 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1545 E = ClassDecl->field_end(); Field != E; ++Field) { 1546 if ((*Field)->isAnonymousStructOrUnion()) { 1547 if (const RecordType *FieldClassType = 1548 Field->getType()->getAs<RecordType>()) { 1549 CXXRecordDecl *FieldClassDecl 1550 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1551 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1552 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1553 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1554 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1555 // set to the anonymous union data member used in the initializer 1556 // list. 1557 Value->setMember(*Field); 1558 Value->setAnonUnionMember(*FA); 1559 AllToInit.push_back(Value); 1560 break; 1561 } 1562 } 1563 } 1564 continue; 1565 } 1566 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1567 AllToInit.push_back(Value); 1568 continue; 1569 } 1570 1571 if ((*Field)->getType()->isDependentType() || AnyErrors) 1572 continue; 1573 1574 QualType FT = Context.getBaseElementType((*Field)->getType()); 1575 if (FT->getAs<RecordType>()) { 1576 InitializedEntity InitEntity 1577 = InitializedEntity::InitializeMember(*Field); 1578 InitializationKind InitKind 1579 = InitializationKind::CreateDefault(Constructor->getLocation()); 1580 1581 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1582 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1583 MultiExprArg(*this, 0, 0)); 1584 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1585 if (MemberInit.isInvalid()) { 1586 HadError = true; 1587 continue; 1588 } 1589 1590 // Don't attach synthesized member initializers in a dependent 1591 // context; they'll be regenerated a template instantiation 1592 // time. 1593 if (CurContext->isDependentContext()) 1594 continue; 1595 1596 CXXBaseOrMemberInitializer *Member = 1597 new (Context) CXXBaseOrMemberInitializer(Context, 1598 *Field, SourceLocation(), 1599 SourceLocation(), 1600 MemberInit.takeAs<Expr>(), 1601 SourceLocation()); 1602 1603 AllToInit.push_back(Member); 1604 } 1605 else if (FT->isReferenceType()) { 1606 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1607 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1608 << 0 << (*Field)->getDeclName(); 1609 Diag((*Field)->getLocation(), diag::note_declared_at); 1610 HadError = true; 1611 } 1612 else if (FT.isConstQualified()) { 1613 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1614 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1615 << 1 << (*Field)->getDeclName(); 1616 Diag((*Field)->getLocation(), diag::note_declared_at); 1617 HadError = true; 1618 } 1619 } 1620 1621 NumInitializers = AllToInit.size(); 1622 if (NumInitializers > 0) { 1623 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1624 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1625 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1626 memcpy(baseOrMemberInitializers, AllToInit.data(), 1627 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1628 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1629 1630 // Constructors implicitly reference the base and member 1631 // destructors. 1632 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1633 Constructor->getParent()); 1634 } 1635 1636 return HadError; 1637} 1638 1639static void *GetKeyForTopLevelField(FieldDecl *Field) { 1640 // For anonymous unions, use the class declaration as the key. 1641 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1642 if (RT->getDecl()->isAnonymousStructOrUnion()) 1643 return static_cast<void *>(RT->getDecl()); 1644 } 1645 return static_cast<void *>(Field); 1646} 1647 1648static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1649 return Context.getCanonicalType(BaseType).getTypePtr(); 1650} 1651 1652static void *GetKeyForMember(ASTContext &Context, 1653 CXXBaseOrMemberInitializer *Member, 1654 bool MemberMaybeAnon = false) { 1655 if (!Member->isMemberInitializer()) 1656 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1657 1658 // For fields injected into the class via declaration of an anonymous union, 1659 // use its anonymous union class declaration as the unique key. 1660 FieldDecl *Field = Member->getMember(); 1661 1662 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1663 // data member of the class. Data member used in the initializer list is 1664 // in AnonUnionMember field. 1665 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1666 Field = Member->getAnonUnionMember(); 1667 1668 // If the field is a member of an anonymous struct or union, our key 1669 // is the anonymous record decl that's a direct child of the class. 1670 RecordDecl *RD = Field->getParent(); 1671 if (RD->isAnonymousStructOrUnion()) { 1672 while (true) { 1673 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1674 if (Parent->isAnonymousStructOrUnion()) 1675 RD = Parent; 1676 else 1677 break; 1678 } 1679 1680 return static_cast<void *>(RD); 1681 } 1682 1683 return static_cast<void *>(Field); 1684} 1685 1686static void 1687DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1688 const CXXConstructorDecl *Constructor, 1689 CXXBaseOrMemberInitializer **Inits, 1690 unsigned NumInits) { 1691 if (Constructor->getDeclContext()->isDependentContext()) 1692 return; 1693 1694 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1695 == Diagnostic::Ignored) 1696 return; 1697 1698 // Build the list of bases and members in the order that they'll 1699 // actually be initialized. The explicit initializers should be in 1700 // this same order but may be missing things. 1701 llvm::SmallVector<const void*, 32> IdealInitKeys; 1702 1703 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1704 1705 // 1. Virtual bases. 1706 for (CXXRecordDecl::base_class_const_iterator VBase = 1707 ClassDecl->vbases_begin(), 1708 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1709 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1710 1711 // 2. Non-virtual bases. 1712 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1713 E = ClassDecl->bases_end(); Base != E; ++Base) { 1714 if (Base->isVirtual()) 1715 continue; 1716 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1717 } 1718 1719 // 3. Direct fields. 1720 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1721 E = ClassDecl->field_end(); Field != E; ++Field) 1722 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1723 1724 unsigned NumIdealInits = IdealInitKeys.size(); 1725 unsigned IdealIndex = 0; 1726 1727 CXXBaseOrMemberInitializer *PrevInit = 0; 1728 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1729 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1730 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1731 1732 // Scan forward to try to find this initializer in the idealized 1733 // initializers list. 1734 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1735 if (InitKey == IdealInitKeys[IdealIndex]) 1736 break; 1737 1738 // If we didn't find this initializer, it must be because we 1739 // scanned past it on a previous iteration. That can only 1740 // happen if we're out of order; emit a warning. 1741 if (IdealIndex == NumIdealInits) { 1742 assert(PrevInit && "initializer not found in initializer list"); 1743 1744 Sema::SemaDiagnosticBuilder D = 1745 SemaRef.Diag(PrevInit->getSourceLocation(), 1746 diag::warn_initializer_out_of_order); 1747 1748 if (PrevInit->isMemberInitializer()) 1749 D << 0 << PrevInit->getMember()->getDeclName(); 1750 else 1751 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1752 1753 if (Init->isMemberInitializer()) 1754 D << 0 << Init->getMember()->getDeclName(); 1755 else 1756 D << 1 << Init->getBaseClassInfo()->getType(); 1757 1758 // Move back to the initializer's location in the ideal list. 1759 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1760 if (InitKey == IdealInitKeys[IdealIndex]) 1761 break; 1762 1763 assert(IdealIndex != NumIdealInits && 1764 "initializer not found in initializer list"); 1765 } 1766 1767 PrevInit = Init; 1768 } 1769} 1770 1771namespace { 1772bool CheckRedundantInit(Sema &S, 1773 CXXBaseOrMemberInitializer *Init, 1774 CXXBaseOrMemberInitializer *&PrevInit) { 1775 if (!PrevInit) { 1776 PrevInit = Init; 1777 return false; 1778 } 1779 1780 if (FieldDecl *Field = Init->getMember()) 1781 S.Diag(Init->getSourceLocation(), 1782 diag::err_multiple_mem_initialization) 1783 << Field->getDeclName() 1784 << Init->getSourceRange(); 1785 else { 1786 Type *BaseClass = Init->getBaseClass(); 1787 assert(BaseClass && "neither field nor base"); 1788 S.Diag(Init->getSourceLocation(), 1789 diag::err_multiple_base_initialization) 1790 << QualType(BaseClass, 0) 1791 << Init->getSourceRange(); 1792 } 1793 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1794 << 0 << PrevInit->getSourceRange(); 1795 1796 return true; 1797} 1798 1799typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1800typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1801 1802bool CheckRedundantUnionInit(Sema &S, 1803 CXXBaseOrMemberInitializer *Init, 1804 RedundantUnionMap &Unions) { 1805 FieldDecl *Field = Init->getMember(); 1806 RecordDecl *Parent = Field->getParent(); 1807 if (!Parent->isAnonymousStructOrUnion()) 1808 return false; 1809 1810 NamedDecl *Child = Field; 1811 do { 1812 if (Parent->isUnion()) { 1813 UnionEntry &En = Unions[Parent]; 1814 if (En.first && En.first != Child) { 1815 S.Diag(Init->getSourceLocation(), 1816 diag::err_multiple_mem_union_initialization) 1817 << Field->getDeclName() 1818 << Init->getSourceRange(); 1819 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1820 << 0 << En.second->getSourceRange(); 1821 return true; 1822 } else if (!En.first) { 1823 En.first = Child; 1824 En.second = Init; 1825 } 1826 } 1827 1828 Child = Parent; 1829 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1830 } while (Parent->isAnonymousStructOrUnion()); 1831 1832 return false; 1833} 1834} 1835 1836/// ActOnMemInitializers - Handle the member initializers for a constructor. 1837void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1838 SourceLocation ColonLoc, 1839 MemInitTy **meminits, unsigned NumMemInits, 1840 bool AnyErrors) { 1841 if (!ConstructorDecl) 1842 return; 1843 1844 AdjustDeclIfTemplate(ConstructorDecl); 1845 1846 CXXConstructorDecl *Constructor 1847 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1848 1849 if (!Constructor) { 1850 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1851 return; 1852 } 1853 1854 CXXBaseOrMemberInitializer **MemInits = 1855 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1856 1857 // Mapping for the duplicate initializers check. 1858 // For member initializers, this is keyed with a FieldDecl*. 1859 // For base initializers, this is keyed with a Type*. 1860 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1861 1862 // Mapping for the inconsistent anonymous-union initializers check. 1863 RedundantUnionMap MemberUnions; 1864 1865 bool HadError = false; 1866 for (unsigned i = 0; i < NumMemInits; i++) { 1867 CXXBaseOrMemberInitializer *Init = MemInits[i]; 1868 1869 if (Init->isMemberInitializer()) { 1870 FieldDecl *Field = Init->getMember(); 1871 if (CheckRedundantInit(*this, Init, Members[Field]) || 1872 CheckRedundantUnionInit(*this, Init, MemberUnions)) 1873 HadError = true; 1874 } else { 1875 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 1876 if (CheckRedundantInit(*this, Init, Members[Key])) 1877 HadError = true; 1878 } 1879 } 1880 1881 if (HadError) 1882 return; 1883 1884 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1885 1886 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1887} 1888 1889void 1890Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1891 CXXRecordDecl *ClassDecl) { 1892 // Ignore dependent contexts. 1893 if (ClassDecl->isDependentContext()) 1894 return; 1895 1896 // FIXME: all the access-control diagnostics are positioned on the 1897 // field/base declaration. That's probably good; that said, the 1898 // user might reasonably want to know why the destructor is being 1899 // emitted, and we currently don't say. 1900 1901 // Non-static data members. 1902 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1903 E = ClassDecl->field_end(); I != E; ++I) { 1904 FieldDecl *Field = *I; 1905 1906 QualType FieldType = Context.getBaseElementType(Field->getType()); 1907 1908 const RecordType* RT = FieldType->getAs<RecordType>(); 1909 if (!RT) 1910 continue; 1911 1912 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1913 if (FieldClassDecl->hasTrivialDestructor()) 1914 continue; 1915 1916 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1917 CheckDestructorAccess(Field->getLocation(), Dtor, 1918 PDiag(diag::err_access_dtor_field) 1919 << Field->getDeclName() 1920 << FieldType); 1921 1922 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1923 } 1924 1925 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1926 1927 // Bases. 1928 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1929 E = ClassDecl->bases_end(); Base != E; ++Base) { 1930 // Bases are always records in a well-formed non-dependent class. 1931 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1932 1933 // Remember direct virtual bases. 1934 if (Base->isVirtual()) 1935 DirectVirtualBases.insert(RT); 1936 1937 // Ignore trivial destructors. 1938 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1939 if (BaseClassDecl->hasTrivialDestructor()) 1940 continue; 1941 1942 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1943 1944 // FIXME: caret should be on the start of the class name 1945 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1946 PDiag(diag::err_access_dtor_base) 1947 << Base->getType() 1948 << Base->getSourceRange()); 1949 1950 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1951 } 1952 1953 // Virtual bases. 1954 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1955 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1956 1957 // Bases are always records in a well-formed non-dependent class. 1958 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1959 1960 // Ignore direct virtual bases. 1961 if (DirectVirtualBases.count(RT)) 1962 continue; 1963 1964 // Ignore trivial destructors. 1965 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1966 if (BaseClassDecl->hasTrivialDestructor()) 1967 continue; 1968 1969 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1970 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1971 PDiag(diag::err_access_dtor_vbase) 1972 << VBase->getType()); 1973 1974 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1975 } 1976} 1977 1978void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1979 if (!CDtorDecl) 1980 return; 1981 1982 if (CXXConstructorDecl *Constructor 1983 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1984 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 1985} 1986 1987bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1988 unsigned DiagID, AbstractDiagSelID SelID, 1989 const CXXRecordDecl *CurrentRD) { 1990 if (SelID == -1) 1991 return RequireNonAbstractType(Loc, T, 1992 PDiag(DiagID), CurrentRD); 1993 else 1994 return RequireNonAbstractType(Loc, T, 1995 PDiag(DiagID) << SelID, CurrentRD); 1996} 1997 1998bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1999 const PartialDiagnostic &PD, 2000 const CXXRecordDecl *CurrentRD) { 2001 if (!getLangOptions().CPlusPlus) 2002 return false; 2003 2004 if (const ArrayType *AT = Context.getAsArrayType(T)) 2005 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2006 CurrentRD); 2007 2008 if (const PointerType *PT = T->getAs<PointerType>()) { 2009 // Find the innermost pointer type. 2010 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2011 PT = T; 2012 2013 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2014 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2015 } 2016 2017 const RecordType *RT = T->getAs<RecordType>(); 2018 if (!RT) 2019 return false; 2020 2021 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2022 2023 if (CurrentRD && CurrentRD != RD) 2024 return false; 2025 2026 // FIXME: is this reasonable? It matches current behavior, but.... 2027 if (!RD->getDefinition()) 2028 return false; 2029 2030 if (!RD->isAbstract()) 2031 return false; 2032 2033 Diag(Loc, PD) << RD->getDeclName(); 2034 2035 // Check if we've already emitted the list of pure virtual functions for this 2036 // class. 2037 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2038 return true; 2039 2040 CXXFinalOverriderMap FinalOverriders; 2041 RD->getFinalOverriders(FinalOverriders); 2042 2043 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2044 MEnd = FinalOverriders.end(); 2045 M != MEnd; 2046 ++M) { 2047 for (OverridingMethods::iterator SO = M->second.begin(), 2048 SOEnd = M->second.end(); 2049 SO != SOEnd; ++SO) { 2050 // C++ [class.abstract]p4: 2051 // A class is abstract if it contains or inherits at least one 2052 // pure virtual function for which the final overrider is pure 2053 // virtual. 2054 2055 // 2056 if (SO->second.size() != 1) 2057 continue; 2058 2059 if (!SO->second.front().Method->isPure()) 2060 continue; 2061 2062 Diag(SO->second.front().Method->getLocation(), 2063 diag::note_pure_virtual_function) 2064 << SO->second.front().Method->getDeclName(); 2065 } 2066 } 2067 2068 if (!PureVirtualClassDiagSet) 2069 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2070 PureVirtualClassDiagSet->insert(RD); 2071 2072 return true; 2073} 2074 2075namespace { 2076 class AbstractClassUsageDiagnoser 2077 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2078 Sema &SemaRef; 2079 CXXRecordDecl *AbstractClass; 2080 2081 bool VisitDeclContext(const DeclContext *DC) { 2082 bool Invalid = false; 2083 2084 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2085 E = DC->decls_end(); I != E; ++I) 2086 Invalid |= Visit(*I); 2087 2088 return Invalid; 2089 } 2090 2091 public: 2092 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2093 : SemaRef(SemaRef), AbstractClass(ac) { 2094 Visit(SemaRef.Context.getTranslationUnitDecl()); 2095 } 2096 2097 bool VisitFunctionDecl(const FunctionDecl *FD) { 2098 if (FD->isThisDeclarationADefinition()) { 2099 // No need to do the check if we're in a definition, because it requires 2100 // that the return/param types are complete. 2101 // because that requires 2102 return VisitDeclContext(FD); 2103 } 2104 2105 // Check the return type. 2106 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2107 bool Invalid = 2108 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2109 diag::err_abstract_type_in_decl, 2110 Sema::AbstractReturnType, 2111 AbstractClass); 2112 2113 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2114 E = FD->param_end(); I != E; ++I) { 2115 const ParmVarDecl *VD = *I; 2116 Invalid |= 2117 SemaRef.RequireNonAbstractType(VD->getLocation(), 2118 VD->getOriginalType(), 2119 diag::err_abstract_type_in_decl, 2120 Sema::AbstractParamType, 2121 AbstractClass); 2122 } 2123 2124 return Invalid; 2125 } 2126 2127 bool VisitDecl(const Decl* D) { 2128 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2129 return VisitDeclContext(DC); 2130 2131 return false; 2132 } 2133 }; 2134} 2135 2136/// \brief Perform semantic checks on a class definition that has been 2137/// completing, introducing implicitly-declared members, checking for 2138/// abstract types, etc. 2139void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2140 if (!Record || Record->isInvalidDecl()) 2141 return; 2142 2143 if (!Record->isDependentType()) 2144 AddImplicitlyDeclaredMembersToClass(S, Record); 2145 2146 if (Record->isInvalidDecl()) 2147 return; 2148 2149 // Set access bits correctly on the directly-declared conversions. 2150 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2151 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2152 Convs->setAccess(I, (*I)->getAccess()); 2153 2154 // Determine whether we need to check for final overriders. We do 2155 // this either when there are virtual base classes (in which case we 2156 // may end up finding multiple final overriders for a given virtual 2157 // function) or any of the base classes is abstract (in which case 2158 // we might detect that this class is abstract). 2159 bool CheckFinalOverriders = false; 2160 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2161 !Record->isDependentType()) { 2162 if (Record->getNumVBases()) 2163 CheckFinalOverriders = true; 2164 else if (!Record->isAbstract()) { 2165 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2166 BEnd = Record->bases_end(); 2167 B != BEnd; ++B) { 2168 CXXRecordDecl *BaseDecl 2169 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2170 if (BaseDecl->isAbstract()) { 2171 CheckFinalOverriders = true; 2172 break; 2173 } 2174 } 2175 } 2176 } 2177 2178 if (CheckFinalOverriders) { 2179 CXXFinalOverriderMap FinalOverriders; 2180 Record->getFinalOverriders(FinalOverriders); 2181 2182 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2183 MEnd = FinalOverriders.end(); 2184 M != MEnd; ++M) { 2185 for (OverridingMethods::iterator SO = M->second.begin(), 2186 SOEnd = M->second.end(); 2187 SO != SOEnd; ++SO) { 2188 assert(SO->second.size() > 0 && 2189 "All virtual functions have overridding virtual functions"); 2190 if (SO->second.size() == 1) { 2191 // C++ [class.abstract]p4: 2192 // A class is abstract if it contains or inherits at least one 2193 // pure virtual function for which the final overrider is pure 2194 // virtual. 2195 if (SO->second.front().Method->isPure()) 2196 Record->setAbstract(true); 2197 continue; 2198 } 2199 2200 // C++ [class.virtual]p2: 2201 // In a derived class, if a virtual member function of a base 2202 // class subobject has more than one final overrider the 2203 // program is ill-formed. 2204 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2205 << (NamedDecl *)M->first << Record; 2206 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2207 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2208 OMEnd = SO->second.end(); 2209 OM != OMEnd; ++OM) 2210 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2211 << (NamedDecl *)M->first << OM->Method->getParent(); 2212 2213 Record->setInvalidDecl(); 2214 } 2215 } 2216 } 2217 2218 if (Record->isAbstract() && !Record->isInvalidDecl()) 2219 (void)AbstractClassUsageDiagnoser(*this, Record); 2220} 2221 2222void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2223 DeclPtrTy TagDecl, 2224 SourceLocation LBrac, 2225 SourceLocation RBrac, 2226 AttributeList *AttrList) { 2227 if (!TagDecl) 2228 return; 2229 2230 AdjustDeclIfTemplate(TagDecl); 2231 2232 ActOnFields(S, RLoc, TagDecl, 2233 (DeclPtrTy*)FieldCollector->getCurFields(), 2234 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2235 2236 CheckCompletedCXXClass(S, 2237 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2238} 2239 2240/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2241/// special functions, such as the default constructor, copy 2242/// constructor, or destructor, to the given C++ class (C++ 2243/// [special]p1). This routine can only be executed just before the 2244/// definition of the class is complete. 2245/// 2246/// The scope, if provided, is the class scope. 2247void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2248 CXXRecordDecl *ClassDecl) { 2249 CanQualType ClassType 2250 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2251 2252 // FIXME: Implicit declarations have exception specifications, which are 2253 // the union of the specifications of the implicitly called functions. 2254 2255 if (!ClassDecl->hasUserDeclaredConstructor()) { 2256 // C++ [class.ctor]p5: 2257 // A default constructor for a class X is a constructor of class X 2258 // that can be called without an argument. If there is no 2259 // user-declared constructor for class X, a default constructor is 2260 // implicitly declared. An implicitly-declared default constructor 2261 // is an inline public member of its class. 2262 DeclarationName Name 2263 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2264 CXXConstructorDecl *DefaultCon = 2265 CXXConstructorDecl::Create(Context, ClassDecl, 2266 ClassDecl->getLocation(), Name, 2267 Context.getFunctionType(Context.VoidTy, 2268 0, 0, false, 0, 2269 /*FIXME*/false, false, 2270 0, 0, 2271 FunctionType::ExtInfo()), 2272 /*TInfo=*/0, 2273 /*isExplicit=*/false, 2274 /*isInline=*/true, 2275 /*isImplicitlyDeclared=*/true); 2276 DefaultCon->setAccess(AS_public); 2277 DefaultCon->setImplicit(); 2278 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2279 if (S) 2280 PushOnScopeChains(DefaultCon, S, true); 2281 else 2282 ClassDecl->addDecl(DefaultCon); 2283 } 2284 2285 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2286 // C++ [class.copy]p4: 2287 // If the class definition does not explicitly declare a copy 2288 // constructor, one is declared implicitly. 2289 2290 // C++ [class.copy]p5: 2291 // The implicitly-declared copy constructor for a class X will 2292 // have the form 2293 // 2294 // X::X(const X&) 2295 // 2296 // if 2297 bool HasConstCopyConstructor = true; 2298 2299 // -- each direct or virtual base class B of X has a copy 2300 // constructor whose first parameter is of type const B& or 2301 // const volatile B&, and 2302 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2303 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2304 const CXXRecordDecl *BaseClassDecl 2305 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2306 HasConstCopyConstructor 2307 = BaseClassDecl->hasConstCopyConstructor(Context); 2308 } 2309 2310 // -- for all the nonstatic data members of X that are of a 2311 // class type M (or array thereof), each such class type 2312 // has a copy constructor whose first parameter is of type 2313 // const M& or const volatile M&. 2314 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2315 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2316 ++Field) { 2317 QualType FieldType = (*Field)->getType(); 2318 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2319 FieldType = Array->getElementType(); 2320 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2321 const CXXRecordDecl *FieldClassDecl 2322 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2323 HasConstCopyConstructor 2324 = FieldClassDecl->hasConstCopyConstructor(Context); 2325 } 2326 } 2327 2328 // Otherwise, the implicitly declared copy constructor will have 2329 // the form 2330 // 2331 // X::X(X&) 2332 QualType ArgType = ClassType; 2333 if (HasConstCopyConstructor) 2334 ArgType = ArgType.withConst(); 2335 ArgType = Context.getLValueReferenceType(ArgType); 2336 2337 // An implicitly-declared copy constructor is an inline public 2338 // member of its class. 2339 DeclarationName Name 2340 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2341 CXXConstructorDecl *CopyConstructor 2342 = CXXConstructorDecl::Create(Context, ClassDecl, 2343 ClassDecl->getLocation(), Name, 2344 Context.getFunctionType(Context.VoidTy, 2345 &ArgType, 1, 2346 false, 0, 2347 /*FIXME:*/false, 2348 false, 0, 0, 2349 FunctionType::ExtInfo()), 2350 /*TInfo=*/0, 2351 /*isExplicit=*/false, 2352 /*isInline=*/true, 2353 /*isImplicitlyDeclared=*/true); 2354 CopyConstructor->setAccess(AS_public); 2355 CopyConstructor->setImplicit(); 2356 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2357 2358 // Add the parameter to the constructor. 2359 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2360 ClassDecl->getLocation(), 2361 /*IdentifierInfo=*/0, 2362 ArgType, /*TInfo=*/0, 2363 VarDecl::None, 0); 2364 CopyConstructor->setParams(&FromParam, 1); 2365 if (S) 2366 PushOnScopeChains(CopyConstructor, S, true); 2367 else 2368 ClassDecl->addDecl(CopyConstructor); 2369 } 2370 2371 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2372 // Note: The following rules are largely analoguous to the copy 2373 // constructor rules. Note that virtual bases are not taken into account 2374 // for determining the argument type of the operator. Note also that 2375 // operators taking an object instead of a reference are allowed. 2376 // 2377 // C++ [class.copy]p10: 2378 // If the class definition does not explicitly declare a copy 2379 // assignment operator, one is declared implicitly. 2380 // The implicitly-defined copy assignment operator for a class X 2381 // will have the form 2382 // 2383 // X& X::operator=(const X&) 2384 // 2385 // if 2386 bool HasConstCopyAssignment = true; 2387 2388 // -- each direct base class B of X has a copy assignment operator 2389 // whose parameter is of type const B&, const volatile B& or B, 2390 // and 2391 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2392 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2393 assert(!Base->getType()->isDependentType() && 2394 "Cannot generate implicit members for class with dependent bases."); 2395 const CXXRecordDecl *BaseClassDecl 2396 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2397 const CXXMethodDecl *MD = 0; 2398 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2399 MD); 2400 } 2401 2402 // -- for all the nonstatic data members of X that are of a class 2403 // type M (or array thereof), each such class type has a copy 2404 // assignment operator whose parameter is of type const M&, 2405 // const volatile M& or M. 2406 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2407 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2408 ++Field) { 2409 QualType FieldType = (*Field)->getType(); 2410 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2411 FieldType = Array->getElementType(); 2412 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2413 const CXXRecordDecl *FieldClassDecl 2414 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2415 const CXXMethodDecl *MD = 0; 2416 HasConstCopyAssignment 2417 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2418 } 2419 } 2420 2421 // Otherwise, the implicitly declared copy assignment operator will 2422 // have the form 2423 // 2424 // X& X::operator=(X&) 2425 QualType ArgType = ClassType; 2426 QualType RetType = Context.getLValueReferenceType(ArgType); 2427 if (HasConstCopyAssignment) 2428 ArgType = ArgType.withConst(); 2429 ArgType = Context.getLValueReferenceType(ArgType); 2430 2431 // An implicitly-declared copy assignment operator is an inline public 2432 // member of its class. 2433 DeclarationName Name = 2434 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2435 CXXMethodDecl *CopyAssignment = 2436 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2437 Context.getFunctionType(RetType, &ArgType, 1, 2438 false, 0, 2439 /*FIXME:*/false, 2440 false, 0, 0, 2441 FunctionType::ExtInfo()), 2442 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2443 CopyAssignment->setAccess(AS_public); 2444 CopyAssignment->setImplicit(); 2445 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2446 CopyAssignment->setCopyAssignment(true); 2447 2448 // Add the parameter to the operator. 2449 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2450 ClassDecl->getLocation(), 2451 /*IdentifierInfo=*/0, 2452 ArgType, /*TInfo=*/0, 2453 VarDecl::None, 0); 2454 CopyAssignment->setParams(&FromParam, 1); 2455 2456 // Don't call addedAssignmentOperator. There is no way to distinguish an 2457 // implicit from an explicit assignment operator. 2458 if (S) 2459 PushOnScopeChains(CopyAssignment, S, true); 2460 else 2461 ClassDecl->addDecl(CopyAssignment); 2462 AddOverriddenMethods(ClassDecl, CopyAssignment); 2463 } 2464 2465 if (!ClassDecl->hasUserDeclaredDestructor()) { 2466 // C++ [class.dtor]p2: 2467 // If a class has no user-declared destructor, a destructor is 2468 // declared implicitly. An implicitly-declared destructor is an 2469 // inline public member of its class. 2470 QualType Ty = Context.getFunctionType(Context.VoidTy, 2471 0, 0, false, 0, 2472 /*FIXME:*/false, 2473 false, 0, 0, FunctionType::ExtInfo()); 2474 2475 DeclarationName Name 2476 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2477 CXXDestructorDecl *Destructor 2478 = CXXDestructorDecl::Create(Context, ClassDecl, 2479 ClassDecl->getLocation(), Name, Ty, 2480 /*isInline=*/true, 2481 /*isImplicitlyDeclared=*/true); 2482 Destructor->setAccess(AS_public); 2483 Destructor->setImplicit(); 2484 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2485 if (S) 2486 PushOnScopeChains(Destructor, S, true); 2487 else 2488 ClassDecl->addDecl(Destructor); 2489 2490 // This could be uniqued if it ever proves significant. 2491 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2492 2493 AddOverriddenMethods(ClassDecl, Destructor); 2494 } 2495} 2496 2497void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2498 Decl *D = TemplateD.getAs<Decl>(); 2499 if (!D) 2500 return; 2501 2502 TemplateParameterList *Params = 0; 2503 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2504 Params = Template->getTemplateParameters(); 2505 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2506 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2507 Params = PartialSpec->getTemplateParameters(); 2508 else 2509 return; 2510 2511 for (TemplateParameterList::iterator Param = Params->begin(), 2512 ParamEnd = Params->end(); 2513 Param != ParamEnd; ++Param) { 2514 NamedDecl *Named = cast<NamedDecl>(*Param); 2515 if (Named->getDeclName()) { 2516 S->AddDecl(DeclPtrTy::make(Named)); 2517 IdResolver.AddDecl(Named); 2518 } 2519 } 2520} 2521 2522void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2523 if (!RecordD) return; 2524 AdjustDeclIfTemplate(RecordD); 2525 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2526 PushDeclContext(S, Record); 2527} 2528 2529void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2530 if (!RecordD) return; 2531 PopDeclContext(); 2532} 2533 2534/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2535/// parsing a top-level (non-nested) C++ class, and we are now 2536/// parsing those parts of the given Method declaration that could 2537/// not be parsed earlier (C++ [class.mem]p2), such as default 2538/// arguments. This action should enter the scope of the given 2539/// Method declaration as if we had just parsed the qualified method 2540/// name. However, it should not bring the parameters into scope; 2541/// that will be performed by ActOnDelayedCXXMethodParameter. 2542void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2543} 2544 2545/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2546/// C++ method declaration. We're (re-)introducing the given 2547/// function parameter into scope for use in parsing later parts of 2548/// the method declaration. For example, we could see an 2549/// ActOnParamDefaultArgument event for this parameter. 2550void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2551 if (!ParamD) 2552 return; 2553 2554 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2555 2556 // If this parameter has an unparsed default argument, clear it out 2557 // to make way for the parsed default argument. 2558 if (Param->hasUnparsedDefaultArg()) 2559 Param->setDefaultArg(0); 2560 2561 S->AddDecl(DeclPtrTy::make(Param)); 2562 if (Param->getDeclName()) 2563 IdResolver.AddDecl(Param); 2564} 2565 2566/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2567/// processing the delayed method declaration for Method. The method 2568/// declaration is now considered finished. There may be a separate 2569/// ActOnStartOfFunctionDef action later (not necessarily 2570/// immediately!) for this method, if it was also defined inside the 2571/// class body. 2572void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2573 if (!MethodD) 2574 return; 2575 2576 AdjustDeclIfTemplate(MethodD); 2577 2578 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2579 2580 // Now that we have our default arguments, check the constructor 2581 // again. It could produce additional diagnostics or affect whether 2582 // the class has implicitly-declared destructors, among other 2583 // things. 2584 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2585 CheckConstructor(Constructor); 2586 2587 // Check the default arguments, which we may have added. 2588 if (!Method->isInvalidDecl()) 2589 CheckCXXDefaultArguments(Method); 2590} 2591 2592/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2593/// the well-formedness of the constructor declarator @p D with type @p 2594/// R. If there are any errors in the declarator, this routine will 2595/// emit diagnostics and set the invalid bit to true. In any case, the type 2596/// will be updated to reflect a well-formed type for the constructor and 2597/// returned. 2598QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2599 FunctionDecl::StorageClass &SC) { 2600 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2601 2602 // C++ [class.ctor]p3: 2603 // A constructor shall not be virtual (10.3) or static (9.4). A 2604 // constructor can be invoked for a const, volatile or const 2605 // volatile object. A constructor shall not be declared const, 2606 // volatile, or const volatile (9.3.2). 2607 if (isVirtual) { 2608 if (!D.isInvalidType()) 2609 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2610 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2611 << SourceRange(D.getIdentifierLoc()); 2612 D.setInvalidType(); 2613 } 2614 if (SC == FunctionDecl::Static) { 2615 if (!D.isInvalidType()) 2616 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2617 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2618 << SourceRange(D.getIdentifierLoc()); 2619 D.setInvalidType(); 2620 SC = FunctionDecl::None; 2621 } 2622 2623 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2624 if (FTI.TypeQuals != 0) { 2625 if (FTI.TypeQuals & Qualifiers::Const) 2626 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2627 << "const" << SourceRange(D.getIdentifierLoc()); 2628 if (FTI.TypeQuals & Qualifiers::Volatile) 2629 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2630 << "volatile" << SourceRange(D.getIdentifierLoc()); 2631 if (FTI.TypeQuals & Qualifiers::Restrict) 2632 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2633 << "restrict" << SourceRange(D.getIdentifierLoc()); 2634 } 2635 2636 // Rebuild the function type "R" without any type qualifiers (in 2637 // case any of the errors above fired) and with "void" as the 2638 // return type, since constructors don't have return types. We 2639 // *always* have to do this, because GetTypeForDeclarator will 2640 // put in a result type of "int" when none was specified. 2641 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2642 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2643 Proto->getNumArgs(), 2644 Proto->isVariadic(), 0, 2645 Proto->hasExceptionSpec(), 2646 Proto->hasAnyExceptionSpec(), 2647 Proto->getNumExceptions(), 2648 Proto->exception_begin(), 2649 Proto->getExtInfo()); 2650} 2651 2652/// CheckConstructor - Checks a fully-formed constructor for 2653/// well-formedness, issuing any diagnostics required. Returns true if 2654/// the constructor declarator is invalid. 2655void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2656 CXXRecordDecl *ClassDecl 2657 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2658 if (!ClassDecl) 2659 return Constructor->setInvalidDecl(); 2660 2661 // C++ [class.copy]p3: 2662 // A declaration of a constructor for a class X is ill-formed if 2663 // its first parameter is of type (optionally cv-qualified) X and 2664 // either there are no other parameters or else all other 2665 // parameters have default arguments. 2666 if (!Constructor->isInvalidDecl() && 2667 ((Constructor->getNumParams() == 1) || 2668 (Constructor->getNumParams() > 1 && 2669 Constructor->getParamDecl(1)->hasDefaultArg())) && 2670 Constructor->getTemplateSpecializationKind() 2671 != TSK_ImplicitInstantiation) { 2672 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2673 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2674 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2675 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2676 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2677 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2678 2679 // FIXME: Rather that making the constructor invalid, we should endeavor 2680 // to fix the type. 2681 Constructor->setInvalidDecl(); 2682 } 2683 } 2684 2685 // Notify the class that we've added a constructor. In principle we 2686 // don't need to do this for out-of-line declarations; in practice 2687 // we only instantiate the most recent declaration of a method, so 2688 // we have to call this for everything but friends. 2689 if (!Constructor->getFriendObjectKind()) 2690 ClassDecl->addedConstructor(Context, Constructor); 2691} 2692 2693/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2694/// issuing any diagnostics required. Returns true on error. 2695bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2696 CXXRecordDecl *RD = Destructor->getParent(); 2697 2698 if (Destructor->isVirtual()) { 2699 SourceLocation Loc; 2700 2701 if (!Destructor->isImplicit()) 2702 Loc = Destructor->getLocation(); 2703 else 2704 Loc = RD->getLocation(); 2705 2706 // If we have a virtual destructor, look up the deallocation function 2707 FunctionDecl *OperatorDelete = 0; 2708 DeclarationName Name = 2709 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2710 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2711 return true; 2712 2713 Destructor->setOperatorDelete(OperatorDelete); 2714 } 2715 2716 return false; 2717} 2718 2719static inline bool 2720FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2721 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2722 FTI.ArgInfo[0].Param && 2723 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2724} 2725 2726/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2727/// the well-formednes of the destructor declarator @p D with type @p 2728/// R. If there are any errors in the declarator, this routine will 2729/// emit diagnostics and set the declarator to invalid. Even if this happens, 2730/// will be updated to reflect a well-formed type for the destructor and 2731/// returned. 2732QualType Sema::CheckDestructorDeclarator(Declarator &D, 2733 FunctionDecl::StorageClass& SC) { 2734 // C++ [class.dtor]p1: 2735 // [...] A typedef-name that names a class is a class-name 2736 // (7.1.3); however, a typedef-name that names a class shall not 2737 // be used as the identifier in the declarator for a destructor 2738 // declaration. 2739 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2740 if (isa<TypedefType>(DeclaratorType)) { 2741 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2742 << DeclaratorType; 2743 D.setInvalidType(); 2744 } 2745 2746 // C++ [class.dtor]p2: 2747 // A destructor is used to destroy objects of its class type. A 2748 // destructor takes no parameters, and no return type can be 2749 // specified for it (not even void). The address of a destructor 2750 // shall not be taken. A destructor shall not be static. A 2751 // destructor can be invoked for a const, volatile or const 2752 // volatile object. A destructor shall not be declared const, 2753 // volatile or const volatile (9.3.2). 2754 if (SC == FunctionDecl::Static) { 2755 if (!D.isInvalidType()) 2756 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2757 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2758 << SourceRange(D.getIdentifierLoc()); 2759 SC = FunctionDecl::None; 2760 D.setInvalidType(); 2761 } 2762 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2763 // Destructors don't have return types, but the parser will 2764 // happily parse something like: 2765 // 2766 // class X { 2767 // float ~X(); 2768 // }; 2769 // 2770 // The return type will be eliminated later. 2771 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2772 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2773 << SourceRange(D.getIdentifierLoc()); 2774 } 2775 2776 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2777 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2778 if (FTI.TypeQuals & Qualifiers::Const) 2779 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2780 << "const" << SourceRange(D.getIdentifierLoc()); 2781 if (FTI.TypeQuals & Qualifiers::Volatile) 2782 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2783 << "volatile" << SourceRange(D.getIdentifierLoc()); 2784 if (FTI.TypeQuals & Qualifiers::Restrict) 2785 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2786 << "restrict" << SourceRange(D.getIdentifierLoc()); 2787 D.setInvalidType(); 2788 } 2789 2790 // Make sure we don't have any parameters. 2791 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2792 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2793 2794 // Delete the parameters. 2795 FTI.freeArgs(); 2796 D.setInvalidType(); 2797 } 2798 2799 // Make sure the destructor isn't variadic. 2800 if (FTI.isVariadic) { 2801 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2802 D.setInvalidType(); 2803 } 2804 2805 // Rebuild the function type "R" without any type qualifiers or 2806 // parameters (in case any of the errors above fired) and with 2807 // "void" as the return type, since destructors don't have return 2808 // types. We *always* have to do this, because GetTypeForDeclarator 2809 // will put in a result type of "int" when none was specified. 2810 // FIXME: Exceptions! 2811 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2812 false, false, 0, 0, FunctionType::ExtInfo()); 2813} 2814 2815/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2816/// well-formednes of the conversion function declarator @p D with 2817/// type @p R. If there are any errors in the declarator, this routine 2818/// will emit diagnostics and return true. Otherwise, it will return 2819/// false. Either way, the type @p R will be updated to reflect a 2820/// well-formed type for the conversion operator. 2821void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2822 FunctionDecl::StorageClass& SC) { 2823 // C++ [class.conv.fct]p1: 2824 // Neither parameter types nor return type can be specified. The 2825 // type of a conversion function (8.3.5) is "function taking no 2826 // parameter returning conversion-type-id." 2827 if (SC == FunctionDecl::Static) { 2828 if (!D.isInvalidType()) 2829 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2830 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2831 << SourceRange(D.getIdentifierLoc()); 2832 D.setInvalidType(); 2833 SC = FunctionDecl::None; 2834 } 2835 2836 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2837 2838 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2839 // Conversion functions don't have return types, but the parser will 2840 // happily parse something like: 2841 // 2842 // class X { 2843 // float operator bool(); 2844 // }; 2845 // 2846 // The return type will be changed later anyway. 2847 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2848 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2849 << SourceRange(D.getIdentifierLoc()); 2850 D.setInvalidType(); 2851 } 2852 2853 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2854 2855 // Make sure we don't have any parameters. 2856 if (Proto->getNumArgs() > 0) { 2857 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2858 2859 // Delete the parameters. 2860 D.getTypeObject(0).Fun.freeArgs(); 2861 D.setInvalidType(); 2862 } else if (Proto->isVariadic()) { 2863 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2864 D.setInvalidType(); 2865 } 2866 2867 // Diagnose "&operator bool()" and other such nonsense. This 2868 // is actually a gcc extension which we don't support. 2869 if (Proto->getResultType() != ConvType) { 2870 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 2871 << Proto->getResultType(); 2872 D.setInvalidType(); 2873 ConvType = Proto->getResultType(); 2874 } 2875 2876 // C++ [class.conv.fct]p4: 2877 // The conversion-type-id shall not represent a function type nor 2878 // an array type. 2879 if (ConvType->isArrayType()) { 2880 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2881 ConvType = Context.getPointerType(ConvType); 2882 D.setInvalidType(); 2883 } else if (ConvType->isFunctionType()) { 2884 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2885 ConvType = Context.getPointerType(ConvType); 2886 D.setInvalidType(); 2887 } 2888 2889 // Rebuild the function type "R" without any parameters (in case any 2890 // of the errors above fired) and with the conversion type as the 2891 // return type. 2892 if (D.isInvalidType()) { 2893 R = Context.getFunctionType(ConvType, 0, 0, false, 2894 Proto->getTypeQuals(), 2895 Proto->hasExceptionSpec(), 2896 Proto->hasAnyExceptionSpec(), 2897 Proto->getNumExceptions(), 2898 Proto->exception_begin(), 2899 Proto->getExtInfo()); 2900 } 2901 2902 // C++0x explicit conversion operators. 2903 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2904 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2905 diag::warn_explicit_conversion_functions) 2906 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2907} 2908 2909/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2910/// the declaration of the given C++ conversion function. This routine 2911/// is responsible for recording the conversion function in the C++ 2912/// class, if possible. 2913Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2914 assert(Conversion && "Expected to receive a conversion function declaration"); 2915 2916 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2917 2918 // Make sure we aren't redeclaring the conversion function. 2919 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2920 2921 // C++ [class.conv.fct]p1: 2922 // [...] A conversion function is never used to convert a 2923 // (possibly cv-qualified) object to the (possibly cv-qualified) 2924 // same object type (or a reference to it), to a (possibly 2925 // cv-qualified) base class of that type (or a reference to it), 2926 // or to (possibly cv-qualified) void. 2927 // FIXME: Suppress this warning if the conversion function ends up being a 2928 // virtual function that overrides a virtual function in a base class. 2929 QualType ClassType 2930 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2931 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2932 ConvType = ConvTypeRef->getPointeeType(); 2933 if (ConvType->isRecordType()) { 2934 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2935 if (ConvType == ClassType) 2936 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2937 << ClassType; 2938 else if (IsDerivedFrom(ClassType, ConvType)) 2939 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2940 << ClassType << ConvType; 2941 } else if (ConvType->isVoidType()) { 2942 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2943 << ClassType << ConvType; 2944 } 2945 2946 if (Conversion->getPrimaryTemplate()) { 2947 // ignore specializations 2948 } else if (Conversion->getPreviousDeclaration()) { 2949 if (FunctionTemplateDecl *ConversionTemplate 2950 = Conversion->getDescribedFunctionTemplate()) { 2951 if (ClassDecl->replaceConversion( 2952 ConversionTemplate->getPreviousDeclaration(), 2953 ConversionTemplate)) 2954 return DeclPtrTy::make(ConversionTemplate); 2955 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2956 Conversion)) 2957 return DeclPtrTy::make(Conversion); 2958 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2959 } else if (FunctionTemplateDecl *ConversionTemplate 2960 = Conversion->getDescribedFunctionTemplate()) 2961 ClassDecl->addConversionFunction(ConversionTemplate); 2962 else 2963 ClassDecl->addConversionFunction(Conversion); 2964 2965 return DeclPtrTy::make(Conversion); 2966} 2967 2968//===----------------------------------------------------------------------===// 2969// Namespace Handling 2970//===----------------------------------------------------------------------===// 2971 2972/// ActOnStartNamespaceDef - This is called at the start of a namespace 2973/// definition. 2974Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2975 SourceLocation IdentLoc, 2976 IdentifierInfo *II, 2977 SourceLocation LBrace, 2978 AttributeList *AttrList) { 2979 NamespaceDecl *Namespc = 2980 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2981 Namespc->setLBracLoc(LBrace); 2982 2983 Scope *DeclRegionScope = NamespcScope->getParent(); 2984 2985 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2986 2987 if (II) { 2988 // C++ [namespace.def]p2: 2989 // The identifier in an original-namespace-definition shall not have been 2990 // previously defined in the declarative region in which the 2991 // original-namespace-definition appears. The identifier in an 2992 // original-namespace-definition is the name of the namespace. Subsequently 2993 // in that declarative region, it is treated as an original-namespace-name. 2994 2995 NamedDecl *PrevDecl 2996 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2997 ForRedeclaration); 2998 2999 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3000 // This is an extended namespace definition. 3001 // Attach this namespace decl to the chain of extended namespace 3002 // definitions. 3003 OrigNS->setNextNamespace(Namespc); 3004 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3005 3006 // Remove the previous declaration from the scope. 3007 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3008 IdResolver.RemoveDecl(OrigNS); 3009 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3010 } 3011 } else if (PrevDecl) { 3012 // This is an invalid name redefinition. 3013 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3014 << Namespc->getDeclName(); 3015 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3016 Namespc->setInvalidDecl(); 3017 // Continue on to push Namespc as current DeclContext and return it. 3018 } else if (II->isStr("std") && 3019 CurContext->getLookupContext()->isTranslationUnit()) { 3020 // This is the first "real" definition of the namespace "std", so update 3021 // our cache of the "std" namespace to point at this definition. 3022 if (StdNamespace) { 3023 // We had already defined a dummy namespace "std". Link this new 3024 // namespace definition to the dummy namespace "std". 3025 StdNamespace->setNextNamespace(Namespc); 3026 StdNamespace->setLocation(IdentLoc); 3027 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3028 } 3029 3030 // Make our StdNamespace cache point at the first real definition of the 3031 // "std" namespace. 3032 StdNamespace = Namespc; 3033 } 3034 3035 PushOnScopeChains(Namespc, DeclRegionScope); 3036 } else { 3037 // Anonymous namespaces. 3038 assert(Namespc->isAnonymousNamespace()); 3039 3040 // Link the anonymous namespace into its parent. 3041 NamespaceDecl *PrevDecl; 3042 DeclContext *Parent = CurContext->getLookupContext(); 3043 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3044 PrevDecl = TU->getAnonymousNamespace(); 3045 TU->setAnonymousNamespace(Namespc); 3046 } else { 3047 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3048 PrevDecl = ND->getAnonymousNamespace(); 3049 ND->setAnonymousNamespace(Namespc); 3050 } 3051 3052 // Link the anonymous namespace with its previous declaration. 3053 if (PrevDecl) { 3054 assert(PrevDecl->isAnonymousNamespace()); 3055 assert(!PrevDecl->getNextNamespace()); 3056 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3057 PrevDecl->setNextNamespace(Namespc); 3058 } 3059 3060 CurContext->addDecl(Namespc); 3061 3062 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3063 // behaves as if it were replaced by 3064 // namespace unique { /* empty body */ } 3065 // using namespace unique; 3066 // namespace unique { namespace-body } 3067 // where all occurrences of 'unique' in a translation unit are 3068 // replaced by the same identifier and this identifier differs 3069 // from all other identifiers in the entire program. 3070 3071 // We just create the namespace with an empty name and then add an 3072 // implicit using declaration, just like the standard suggests. 3073 // 3074 // CodeGen enforces the "universally unique" aspect by giving all 3075 // declarations semantically contained within an anonymous 3076 // namespace internal linkage. 3077 3078 if (!PrevDecl) { 3079 UsingDirectiveDecl* UD 3080 = UsingDirectiveDecl::Create(Context, CurContext, 3081 /* 'using' */ LBrace, 3082 /* 'namespace' */ SourceLocation(), 3083 /* qualifier */ SourceRange(), 3084 /* NNS */ NULL, 3085 /* identifier */ SourceLocation(), 3086 Namespc, 3087 /* Ancestor */ CurContext); 3088 UD->setImplicit(); 3089 CurContext->addDecl(UD); 3090 } 3091 } 3092 3093 // Although we could have an invalid decl (i.e. the namespace name is a 3094 // redefinition), push it as current DeclContext and try to continue parsing. 3095 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3096 // for the namespace has the declarations that showed up in that particular 3097 // namespace definition. 3098 PushDeclContext(NamespcScope, Namespc); 3099 return DeclPtrTy::make(Namespc); 3100} 3101 3102/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3103/// is a namespace alias, returns the namespace it points to. 3104static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3105 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3106 return AD->getNamespace(); 3107 return dyn_cast_or_null<NamespaceDecl>(D); 3108} 3109 3110/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3111/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3112void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3113 Decl *Dcl = D.getAs<Decl>(); 3114 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3115 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3116 Namespc->setRBracLoc(RBrace); 3117 PopDeclContext(); 3118} 3119 3120Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3121 SourceLocation UsingLoc, 3122 SourceLocation NamespcLoc, 3123 CXXScopeSpec &SS, 3124 SourceLocation IdentLoc, 3125 IdentifierInfo *NamespcName, 3126 AttributeList *AttrList) { 3127 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3128 assert(NamespcName && "Invalid NamespcName."); 3129 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3130 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3131 3132 UsingDirectiveDecl *UDir = 0; 3133 3134 // Lookup namespace name. 3135 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3136 LookupParsedName(R, S, &SS); 3137 if (R.isAmbiguous()) 3138 return DeclPtrTy(); 3139 3140 if (!R.empty()) { 3141 NamedDecl *Named = R.getFoundDecl(); 3142 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3143 && "expected namespace decl"); 3144 // C++ [namespace.udir]p1: 3145 // A using-directive specifies that the names in the nominated 3146 // namespace can be used in the scope in which the 3147 // using-directive appears after the using-directive. During 3148 // unqualified name lookup (3.4.1), the names appear as if they 3149 // were declared in the nearest enclosing namespace which 3150 // contains both the using-directive and the nominated 3151 // namespace. [Note: in this context, "contains" means "contains 3152 // directly or indirectly". ] 3153 3154 // Find enclosing context containing both using-directive and 3155 // nominated namespace. 3156 NamespaceDecl *NS = getNamespaceDecl(Named); 3157 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3158 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3159 CommonAncestor = CommonAncestor->getParent(); 3160 3161 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3162 SS.getRange(), 3163 (NestedNameSpecifier *)SS.getScopeRep(), 3164 IdentLoc, Named, CommonAncestor); 3165 PushUsingDirective(S, UDir); 3166 } else { 3167 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3168 } 3169 3170 // FIXME: We ignore attributes for now. 3171 delete AttrList; 3172 return DeclPtrTy::make(UDir); 3173} 3174 3175void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3176 // If scope has associated entity, then using directive is at namespace 3177 // or translation unit scope. We add UsingDirectiveDecls, into 3178 // it's lookup structure. 3179 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3180 Ctx->addDecl(UDir); 3181 else 3182 // Otherwise it is block-sope. using-directives will affect lookup 3183 // only to the end of scope. 3184 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3185} 3186 3187 3188Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3189 AccessSpecifier AS, 3190 bool HasUsingKeyword, 3191 SourceLocation UsingLoc, 3192 CXXScopeSpec &SS, 3193 UnqualifiedId &Name, 3194 AttributeList *AttrList, 3195 bool IsTypeName, 3196 SourceLocation TypenameLoc) { 3197 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3198 3199 switch (Name.getKind()) { 3200 case UnqualifiedId::IK_Identifier: 3201 case UnqualifiedId::IK_OperatorFunctionId: 3202 case UnqualifiedId::IK_LiteralOperatorId: 3203 case UnqualifiedId::IK_ConversionFunctionId: 3204 break; 3205 3206 case UnqualifiedId::IK_ConstructorName: 3207 case UnqualifiedId::IK_ConstructorTemplateId: 3208 // C++0x inherited constructors. 3209 if (getLangOptions().CPlusPlus0x) break; 3210 3211 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3212 << SS.getRange(); 3213 return DeclPtrTy(); 3214 3215 case UnqualifiedId::IK_DestructorName: 3216 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3217 << SS.getRange(); 3218 return DeclPtrTy(); 3219 3220 case UnqualifiedId::IK_TemplateId: 3221 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3222 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3223 return DeclPtrTy(); 3224 } 3225 3226 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3227 if (!TargetName) 3228 return DeclPtrTy(); 3229 3230 // Warn about using declarations. 3231 // TODO: store that the declaration was written without 'using' and 3232 // talk about access decls instead of using decls in the 3233 // diagnostics. 3234 if (!HasUsingKeyword) { 3235 UsingLoc = Name.getSourceRange().getBegin(); 3236 3237 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3238 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3239 } 3240 3241 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3242 Name.getSourceRange().getBegin(), 3243 TargetName, AttrList, 3244 /* IsInstantiation */ false, 3245 IsTypeName, TypenameLoc); 3246 if (UD) 3247 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3248 3249 return DeclPtrTy::make(UD); 3250} 3251 3252/// Determines whether to create a using shadow decl for a particular 3253/// decl, given the set of decls existing prior to this using lookup. 3254bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3255 const LookupResult &Previous) { 3256 // Diagnose finding a decl which is not from a base class of the 3257 // current class. We do this now because there are cases where this 3258 // function will silently decide not to build a shadow decl, which 3259 // will pre-empt further diagnostics. 3260 // 3261 // We don't need to do this in C++0x because we do the check once on 3262 // the qualifier. 3263 // 3264 // FIXME: diagnose the following if we care enough: 3265 // struct A { int foo; }; 3266 // struct B : A { using A::foo; }; 3267 // template <class T> struct C : A {}; 3268 // template <class T> struct D : C<T> { using B::foo; } // <--- 3269 // This is invalid (during instantiation) in C++03 because B::foo 3270 // resolves to the using decl in B, which is not a base class of D<T>. 3271 // We can't diagnose it immediately because C<T> is an unknown 3272 // specialization. The UsingShadowDecl in D<T> then points directly 3273 // to A::foo, which will look well-formed when we instantiate. 3274 // The right solution is to not collapse the shadow-decl chain. 3275 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3276 DeclContext *OrigDC = Orig->getDeclContext(); 3277 3278 // Handle enums and anonymous structs. 3279 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3280 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3281 while (OrigRec->isAnonymousStructOrUnion()) 3282 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3283 3284 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3285 if (OrigDC == CurContext) { 3286 Diag(Using->getLocation(), 3287 diag::err_using_decl_nested_name_specifier_is_current_class) 3288 << Using->getNestedNameRange(); 3289 Diag(Orig->getLocation(), diag::note_using_decl_target); 3290 return true; 3291 } 3292 3293 Diag(Using->getNestedNameRange().getBegin(), 3294 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3295 << Using->getTargetNestedNameDecl() 3296 << cast<CXXRecordDecl>(CurContext) 3297 << Using->getNestedNameRange(); 3298 Diag(Orig->getLocation(), diag::note_using_decl_target); 3299 return true; 3300 } 3301 } 3302 3303 if (Previous.empty()) return false; 3304 3305 NamedDecl *Target = Orig; 3306 if (isa<UsingShadowDecl>(Target)) 3307 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3308 3309 // If the target happens to be one of the previous declarations, we 3310 // don't have a conflict. 3311 // 3312 // FIXME: but we might be increasing its access, in which case we 3313 // should redeclare it. 3314 NamedDecl *NonTag = 0, *Tag = 0; 3315 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3316 I != E; ++I) { 3317 NamedDecl *D = (*I)->getUnderlyingDecl(); 3318 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3319 return false; 3320 3321 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3322 } 3323 3324 if (Target->isFunctionOrFunctionTemplate()) { 3325 FunctionDecl *FD; 3326 if (isa<FunctionTemplateDecl>(Target)) 3327 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3328 else 3329 FD = cast<FunctionDecl>(Target); 3330 3331 NamedDecl *OldDecl = 0; 3332 switch (CheckOverload(FD, Previous, OldDecl)) { 3333 case Ovl_Overload: 3334 return false; 3335 3336 case Ovl_NonFunction: 3337 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3338 break; 3339 3340 // We found a decl with the exact signature. 3341 case Ovl_Match: 3342 if (isa<UsingShadowDecl>(OldDecl)) { 3343 // Silently ignore the possible conflict. 3344 return false; 3345 } 3346 3347 // If we're in a record, we want to hide the target, so we 3348 // return true (without a diagnostic) to tell the caller not to 3349 // build a shadow decl. 3350 if (CurContext->isRecord()) 3351 return true; 3352 3353 // If we're not in a record, this is an error. 3354 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3355 break; 3356 } 3357 3358 Diag(Target->getLocation(), diag::note_using_decl_target); 3359 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3360 return true; 3361 } 3362 3363 // Target is not a function. 3364 3365 if (isa<TagDecl>(Target)) { 3366 // No conflict between a tag and a non-tag. 3367 if (!Tag) return false; 3368 3369 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3370 Diag(Target->getLocation(), diag::note_using_decl_target); 3371 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3372 return true; 3373 } 3374 3375 // No conflict between a tag and a non-tag. 3376 if (!NonTag) return false; 3377 3378 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3379 Diag(Target->getLocation(), diag::note_using_decl_target); 3380 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3381 return true; 3382} 3383 3384/// Builds a shadow declaration corresponding to a 'using' declaration. 3385UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3386 UsingDecl *UD, 3387 NamedDecl *Orig) { 3388 3389 // If we resolved to another shadow declaration, just coalesce them. 3390 NamedDecl *Target = Orig; 3391 if (isa<UsingShadowDecl>(Target)) { 3392 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3393 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3394 } 3395 3396 UsingShadowDecl *Shadow 3397 = UsingShadowDecl::Create(Context, CurContext, 3398 UD->getLocation(), UD, Target); 3399 UD->addShadowDecl(Shadow); 3400 3401 if (S) 3402 PushOnScopeChains(Shadow, S); 3403 else 3404 CurContext->addDecl(Shadow); 3405 Shadow->setAccess(UD->getAccess()); 3406 3407 // Register it as a conversion if appropriate. 3408 if (Shadow->getDeclName().getNameKind() 3409 == DeclarationName::CXXConversionFunctionName) 3410 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3411 3412 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3413 Shadow->setInvalidDecl(); 3414 3415 return Shadow; 3416} 3417 3418/// Hides a using shadow declaration. This is required by the current 3419/// using-decl implementation when a resolvable using declaration in a 3420/// class is followed by a declaration which would hide or override 3421/// one or more of the using decl's targets; for example: 3422/// 3423/// struct Base { void foo(int); }; 3424/// struct Derived : Base { 3425/// using Base::foo; 3426/// void foo(int); 3427/// }; 3428/// 3429/// The governing language is C++03 [namespace.udecl]p12: 3430/// 3431/// When a using-declaration brings names from a base class into a 3432/// derived class scope, member functions in the derived class 3433/// override and/or hide member functions with the same name and 3434/// parameter types in a base class (rather than conflicting). 3435/// 3436/// There are two ways to implement this: 3437/// (1) optimistically create shadow decls when they're not hidden 3438/// by existing declarations, or 3439/// (2) don't create any shadow decls (or at least don't make them 3440/// visible) until we've fully parsed/instantiated the class. 3441/// The problem with (1) is that we might have to retroactively remove 3442/// a shadow decl, which requires several O(n) operations because the 3443/// decl structures are (very reasonably) not designed for removal. 3444/// (2) avoids this but is very fiddly and phase-dependent. 3445void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3446 if (Shadow->getDeclName().getNameKind() == 3447 DeclarationName::CXXConversionFunctionName) 3448 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3449 3450 // Remove it from the DeclContext... 3451 Shadow->getDeclContext()->removeDecl(Shadow); 3452 3453 // ...and the scope, if applicable... 3454 if (S) { 3455 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3456 IdResolver.RemoveDecl(Shadow); 3457 } 3458 3459 // ...and the using decl. 3460 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3461 3462 // TODO: complain somehow if Shadow was used. It shouldn't 3463 // be possible for this to happen, because...? 3464} 3465 3466/// Builds a using declaration. 3467/// 3468/// \param IsInstantiation - Whether this call arises from an 3469/// instantiation of an unresolved using declaration. We treat 3470/// the lookup differently for these declarations. 3471NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3472 SourceLocation UsingLoc, 3473 CXXScopeSpec &SS, 3474 SourceLocation IdentLoc, 3475 DeclarationName Name, 3476 AttributeList *AttrList, 3477 bool IsInstantiation, 3478 bool IsTypeName, 3479 SourceLocation TypenameLoc) { 3480 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3481 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3482 3483 // FIXME: We ignore attributes for now. 3484 delete AttrList; 3485 3486 if (SS.isEmpty()) { 3487 Diag(IdentLoc, diag::err_using_requires_qualname); 3488 return 0; 3489 } 3490 3491 // Do the redeclaration lookup in the current scope. 3492 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3493 ForRedeclaration); 3494 Previous.setHideTags(false); 3495 if (S) { 3496 LookupName(Previous, S); 3497 3498 // It is really dumb that we have to do this. 3499 LookupResult::Filter F = Previous.makeFilter(); 3500 while (F.hasNext()) { 3501 NamedDecl *D = F.next(); 3502 if (!isDeclInScope(D, CurContext, S)) 3503 F.erase(); 3504 } 3505 F.done(); 3506 } else { 3507 assert(IsInstantiation && "no scope in non-instantiation"); 3508 assert(CurContext->isRecord() && "scope not record in instantiation"); 3509 LookupQualifiedName(Previous, CurContext); 3510 } 3511 3512 NestedNameSpecifier *NNS = 3513 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3514 3515 // Check for invalid redeclarations. 3516 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3517 return 0; 3518 3519 // Check for bad qualifiers. 3520 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3521 return 0; 3522 3523 DeclContext *LookupContext = computeDeclContext(SS); 3524 NamedDecl *D; 3525 if (!LookupContext) { 3526 if (IsTypeName) { 3527 // FIXME: not all declaration name kinds are legal here 3528 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3529 UsingLoc, TypenameLoc, 3530 SS.getRange(), NNS, 3531 IdentLoc, Name); 3532 } else { 3533 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3534 UsingLoc, SS.getRange(), NNS, 3535 IdentLoc, Name); 3536 } 3537 } else { 3538 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3539 SS.getRange(), UsingLoc, NNS, Name, 3540 IsTypeName); 3541 } 3542 D->setAccess(AS); 3543 CurContext->addDecl(D); 3544 3545 if (!LookupContext) return D; 3546 UsingDecl *UD = cast<UsingDecl>(D); 3547 3548 if (RequireCompleteDeclContext(SS)) { 3549 UD->setInvalidDecl(); 3550 return UD; 3551 } 3552 3553 // Look up the target name. 3554 3555 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3556 3557 // Unlike most lookups, we don't always want to hide tag 3558 // declarations: tag names are visible through the using declaration 3559 // even if hidden by ordinary names, *except* in a dependent context 3560 // where it's important for the sanity of two-phase lookup. 3561 if (!IsInstantiation) 3562 R.setHideTags(false); 3563 3564 LookupQualifiedName(R, LookupContext); 3565 3566 if (R.empty()) { 3567 Diag(IdentLoc, diag::err_no_member) 3568 << Name << LookupContext << SS.getRange(); 3569 UD->setInvalidDecl(); 3570 return UD; 3571 } 3572 3573 if (R.isAmbiguous()) { 3574 UD->setInvalidDecl(); 3575 return UD; 3576 } 3577 3578 if (IsTypeName) { 3579 // If we asked for a typename and got a non-type decl, error out. 3580 if (!R.getAsSingle<TypeDecl>()) { 3581 Diag(IdentLoc, diag::err_using_typename_non_type); 3582 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3583 Diag((*I)->getUnderlyingDecl()->getLocation(), 3584 diag::note_using_decl_target); 3585 UD->setInvalidDecl(); 3586 return UD; 3587 } 3588 } else { 3589 // If we asked for a non-typename and we got a type, error out, 3590 // but only if this is an instantiation of an unresolved using 3591 // decl. Otherwise just silently find the type name. 3592 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3593 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3594 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3595 UD->setInvalidDecl(); 3596 return UD; 3597 } 3598 } 3599 3600 // C++0x N2914 [namespace.udecl]p6: 3601 // A using-declaration shall not name a namespace. 3602 if (R.getAsSingle<NamespaceDecl>()) { 3603 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3604 << SS.getRange(); 3605 UD->setInvalidDecl(); 3606 return UD; 3607 } 3608 3609 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3610 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3611 BuildUsingShadowDecl(S, UD, *I); 3612 } 3613 3614 return UD; 3615} 3616 3617/// Checks that the given using declaration is not an invalid 3618/// redeclaration. Note that this is checking only for the using decl 3619/// itself, not for any ill-formedness among the UsingShadowDecls. 3620bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3621 bool isTypeName, 3622 const CXXScopeSpec &SS, 3623 SourceLocation NameLoc, 3624 const LookupResult &Prev) { 3625 // C++03 [namespace.udecl]p8: 3626 // C++0x [namespace.udecl]p10: 3627 // A using-declaration is a declaration and can therefore be used 3628 // repeatedly where (and only where) multiple declarations are 3629 // allowed. 3630 // That's only in file contexts. 3631 if (CurContext->getLookupContext()->isFileContext()) 3632 return false; 3633 3634 NestedNameSpecifier *Qual 3635 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3636 3637 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3638 NamedDecl *D = *I; 3639 3640 bool DTypename; 3641 NestedNameSpecifier *DQual; 3642 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3643 DTypename = UD->isTypeName(); 3644 DQual = UD->getTargetNestedNameDecl(); 3645 } else if (UnresolvedUsingValueDecl *UD 3646 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3647 DTypename = false; 3648 DQual = UD->getTargetNestedNameSpecifier(); 3649 } else if (UnresolvedUsingTypenameDecl *UD 3650 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3651 DTypename = true; 3652 DQual = UD->getTargetNestedNameSpecifier(); 3653 } else continue; 3654 3655 // using decls differ if one says 'typename' and the other doesn't. 3656 // FIXME: non-dependent using decls? 3657 if (isTypeName != DTypename) continue; 3658 3659 // using decls differ if they name different scopes (but note that 3660 // template instantiation can cause this check to trigger when it 3661 // didn't before instantiation). 3662 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3663 Context.getCanonicalNestedNameSpecifier(DQual)) 3664 continue; 3665 3666 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3667 Diag(D->getLocation(), diag::note_using_decl) << 1; 3668 return true; 3669 } 3670 3671 return false; 3672} 3673 3674 3675/// Checks that the given nested-name qualifier used in a using decl 3676/// in the current context is appropriately related to the current 3677/// scope. If an error is found, diagnoses it and returns true. 3678bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3679 const CXXScopeSpec &SS, 3680 SourceLocation NameLoc) { 3681 DeclContext *NamedContext = computeDeclContext(SS); 3682 3683 if (!CurContext->isRecord()) { 3684 // C++03 [namespace.udecl]p3: 3685 // C++0x [namespace.udecl]p8: 3686 // A using-declaration for a class member shall be a member-declaration. 3687 3688 // If we weren't able to compute a valid scope, it must be a 3689 // dependent class scope. 3690 if (!NamedContext || NamedContext->isRecord()) { 3691 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3692 << SS.getRange(); 3693 return true; 3694 } 3695 3696 // Otherwise, everything is known to be fine. 3697 return false; 3698 } 3699 3700 // The current scope is a record. 3701 3702 // If the named context is dependent, we can't decide much. 3703 if (!NamedContext) { 3704 // FIXME: in C++0x, we can diagnose if we can prove that the 3705 // nested-name-specifier does not refer to a base class, which is 3706 // still possible in some cases. 3707 3708 // Otherwise we have to conservatively report that things might be 3709 // okay. 3710 return false; 3711 } 3712 3713 if (!NamedContext->isRecord()) { 3714 // Ideally this would point at the last name in the specifier, 3715 // but we don't have that level of source info. 3716 Diag(SS.getRange().getBegin(), 3717 diag::err_using_decl_nested_name_specifier_is_not_class) 3718 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3719 return true; 3720 } 3721 3722 if (getLangOptions().CPlusPlus0x) { 3723 // C++0x [namespace.udecl]p3: 3724 // In a using-declaration used as a member-declaration, the 3725 // nested-name-specifier shall name a base class of the class 3726 // being defined. 3727 3728 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3729 cast<CXXRecordDecl>(NamedContext))) { 3730 if (CurContext == NamedContext) { 3731 Diag(NameLoc, 3732 diag::err_using_decl_nested_name_specifier_is_current_class) 3733 << SS.getRange(); 3734 return true; 3735 } 3736 3737 Diag(SS.getRange().getBegin(), 3738 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3739 << (NestedNameSpecifier*) SS.getScopeRep() 3740 << cast<CXXRecordDecl>(CurContext) 3741 << SS.getRange(); 3742 return true; 3743 } 3744 3745 return false; 3746 } 3747 3748 // C++03 [namespace.udecl]p4: 3749 // A using-declaration used as a member-declaration shall refer 3750 // to a member of a base class of the class being defined [etc.]. 3751 3752 // Salient point: SS doesn't have to name a base class as long as 3753 // lookup only finds members from base classes. Therefore we can 3754 // diagnose here only if we can prove that that can't happen, 3755 // i.e. if the class hierarchies provably don't intersect. 3756 3757 // TODO: it would be nice if "definitely valid" results were cached 3758 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3759 // need to be repeated. 3760 3761 struct UserData { 3762 llvm::DenseSet<const CXXRecordDecl*> Bases; 3763 3764 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3765 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3766 Data->Bases.insert(Base); 3767 return true; 3768 } 3769 3770 bool hasDependentBases(const CXXRecordDecl *Class) { 3771 return !Class->forallBases(collect, this); 3772 } 3773 3774 /// Returns true if the base is dependent or is one of the 3775 /// accumulated base classes. 3776 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3777 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3778 return !Data->Bases.count(Base); 3779 } 3780 3781 bool mightShareBases(const CXXRecordDecl *Class) { 3782 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3783 } 3784 }; 3785 3786 UserData Data; 3787 3788 // Returns false if we find a dependent base. 3789 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3790 return false; 3791 3792 // Returns false if the class has a dependent base or if it or one 3793 // of its bases is present in the base set of the current context. 3794 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3795 return false; 3796 3797 Diag(SS.getRange().getBegin(), 3798 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3799 << (NestedNameSpecifier*) SS.getScopeRep() 3800 << cast<CXXRecordDecl>(CurContext) 3801 << SS.getRange(); 3802 3803 return true; 3804} 3805 3806Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3807 SourceLocation NamespaceLoc, 3808 SourceLocation AliasLoc, 3809 IdentifierInfo *Alias, 3810 CXXScopeSpec &SS, 3811 SourceLocation IdentLoc, 3812 IdentifierInfo *Ident) { 3813 3814 // Lookup the namespace name. 3815 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3816 LookupParsedName(R, S, &SS); 3817 3818 // Check if we have a previous declaration with the same name. 3819 if (NamedDecl *PrevDecl 3820 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3821 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3822 // We already have an alias with the same name that points to the same 3823 // namespace, so don't create a new one. 3824 // FIXME: At some point, we'll want to create the (redundant) 3825 // declaration to maintain better source information. 3826 if (!R.isAmbiguous() && !R.empty() && 3827 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3828 return DeclPtrTy(); 3829 } 3830 3831 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3832 diag::err_redefinition_different_kind; 3833 Diag(AliasLoc, DiagID) << Alias; 3834 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3835 return DeclPtrTy(); 3836 } 3837 3838 if (R.isAmbiguous()) 3839 return DeclPtrTy(); 3840 3841 if (R.empty()) { 3842 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3843 return DeclPtrTy(); 3844 } 3845 3846 NamespaceAliasDecl *AliasDecl = 3847 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3848 Alias, SS.getRange(), 3849 (NestedNameSpecifier *)SS.getScopeRep(), 3850 IdentLoc, R.getFoundDecl()); 3851 3852 PushOnScopeChains(AliasDecl, S); 3853 return DeclPtrTy::make(AliasDecl); 3854} 3855 3856void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3857 CXXConstructorDecl *Constructor) { 3858 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3859 !Constructor->isUsed()) && 3860 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3861 3862 CXXRecordDecl *ClassDecl 3863 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3864 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3865 3866 DeclContext *PreviousContext = CurContext; 3867 CurContext = Constructor; 3868 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3869 Diag(CurrentLocation, diag::note_member_synthesized_at) 3870 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3871 Constructor->setInvalidDecl(); 3872 } else { 3873 Constructor->setUsed(); 3874 } 3875 CurContext = PreviousContext; 3876} 3877 3878void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3879 CXXDestructorDecl *Destructor) { 3880 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3881 "DefineImplicitDestructor - call it for implicit default dtor"); 3882 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3883 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3884 3885 DeclContext *PreviousContext = CurContext; 3886 CurContext = Destructor; 3887 3888 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3889 Destructor->getParent()); 3890 3891 // FIXME: If CheckDestructor fails, we should emit a note about where the 3892 // implicit destructor was needed. 3893 if (CheckDestructor(Destructor)) { 3894 Diag(CurrentLocation, diag::note_member_synthesized_at) 3895 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3896 3897 Destructor->setInvalidDecl(); 3898 CurContext = PreviousContext; 3899 3900 return; 3901 } 3902 CurContext = PreviousContext; 3903 3904 Destructor->setUsed(); 3905} 3906 3907void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3908 CXXMethodDecl *MethodDecl) { 3909 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3910 MethodDecl->getOverloadedOperator() == OO_Equal && 3911 !MethodDecl->isUsed()) && 3912 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3913 3914 CXXRecordDecl *ClassDecl 3915 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3916 3917 DeclContext *PreviousContext = CurContext; 3918 CurContext = MethodDecl; 3919 3920 // C++[class.copy] p12 3921 // Before the implicitly-declared copy assignment operator for a class is 3922 // implicitly defined, all implicitly-declared copy assignment operators 3923 // for its direct base classes and its nonstatic data members shall have 3924 // been implicitly defined. 3925 bool err = false; 3926 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3927 E = ClassDecl->bases_end(); Base != E; ++Base) { 3928 CXXRecordDecl *BaseClassDecl 3929 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3930 if (CXXMethodDecl *BaseAssignOpMethod = 3931 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3932 BaseClassDecl)) { 3933 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3934 BaseAssignOpMethod, 3935 PDiag(diag::err_access_assign_base) 3936 << Base->getType()); 3937 3938 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3939 } 3940 } 3941 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3942 E = ClassDecl->field_end(); Field != E; ++Field) { 3943 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3944 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3945 FieldType = Array->getElementType(); 3946 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3947 CXXRecordDecl *FieldClassDecl 3948 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3949 if (CXXMethodDecl *FieldAssignOpMethod = 3950 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3951 FieldClassDecl)) { 3952 CheckDirectMemberAccess(Field->getLocation(), 3953 FieldAssignOpMethod, 3954 PDiag(diag::err_access_assign_field) 3955 << Field->getDeclName() << Field->getType()); 3956 3957 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3958 } 3959 } else if (FieldType->isReferenceType()) { 3960 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3961 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3962 Diag(Field->getLocation(), diag::note_declared_at); 3963 Diag(CurrentLocation, diag::note_first_required_here); 3964 err = true; 3965 } else if (FieldType.isConstQualified()) { 3966 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3967 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3968 Diag(Field->getLocation(), diag::note_declared_at); 3969 Diag(CurrentLocation, diag::note_first_required_here); 3970 err = true; 3971 } 3972 } 3973 if (!err) 3974 MethodDecl->setUsed(); 3975 3976 CurContext = PreviousContext; 3977} 3978 3979CXXMethodDecl * 3980Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3981 ParmVarDecl *ParmDecl, 3982 CXXRecordDecl *ClassDecl) { 3983 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3984 QualType RHSType(LHSType); 3985 // If class's assignment operator argument is const/volatile qualified, 3986 // look for operator = (const/volatile B&). Otherwise, look for 3987 // operator = (B&). 3988 RHSType = Context.getCVRQualifiedType(RHSType, 3989 ParmDecl->getType().getCVRQualifiers()); 3990 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3991 LHSType, 3992 SourceLocation())); 3993 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3994 RHSType, 3995 CurrentLocation)); 3996 Expr *Args[2] = { &*LHS, &*RHS }; 3997 OverloadCandidateSet CandidateSet(CurrentLocation); 3998 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3999 CandidateSet); 4000 OverloadCandidateSet::iterator Best; 4001 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4002 return cast<CXXMethodDecl>(Best->Function); 4003 assert(false && 4004 "getAssignOperatorMethod - copy assignment operator method not found"); 4005 return 0; 4006} 4007 4008void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4009 CXXConstructorDecl *CopyConstructor, 4010 unsigned TypeQuals) { 4011 assert((CopyConstructor->isImplicit() && 4012 CopyConstructor->isCopyConstructor(TypeQuals) && 4013 !CopyConstructor->isUsed()) && 4014 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4015 4016 CXXRecordDecl *ClassDecl 4017 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 4018 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4019 4020 DeclContext *PreviousContext = CurContext; 4021 CurContext = CopyConstructor; 4022 4023 // C++ [class.copy] p209 4024 // Before the implicitly-declared copy constructor for a class is 4025 // implicitly defined, all the implicitly-declared copy constructors 4026 // for its base class and its non-static data members shall have been 4027 // implicitly defined. 4028 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 4029 Base != ClassDecl->bases_end(); ++Base) { 4030 CXXRecordDecl *BaseClassDecl 4031 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4032 if (CXXConstructorDecl *BaseCopyCtor = 4033 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4034 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4035 BaseCopyCtor, 4036 PDiag(diag::err_access_copy_base) 4037 << Base->getType()); 4038 4039 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4040 } 4041 } 4042 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4043 FieldEnd = ClassDecl->field_end(); 4044 Field != FieldEnd; ++Field) { 4045 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4046 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4047 FieldType = Array->getElementType(); 4048 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4049 CXXRecordDecl *FieldClassDecl 4050 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4051 if (CXXConstructorDecl *FieldCopyCtor = 4052 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4053 CheckDirectMemberAccess(Field->getLocation(), 4054 FieldCopyCtor, 4055 PDiag(diag::err_access_copy_field) 4056 << Field->getDeclName() << Field->getType()); 4057 4058 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4059 } 4060 } 4061 } 4062 CopyConstructor->setUsed(); 4063 4064 CurContext = PreviousContext; 4065} 4066 4067Sema::OwningExprResult 4068Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4069 CXXConstructorDecl *Constructor, 4070 MultiExprArg ExprArgs, 4071 bool RequiresZeroInit, 4072 bool BaseInitialization) { 4073 bool Elidable = false; 4074 4075 // C++0x [class.copy]p34: 4076 // When certain criteria are met, an implementation is allowed to 4077 // omit the copy/move construction of a class object, even if the 4078 // copy/move constructor and/or destructor for the object have 4079 // side effects. [...] 4080 // - when a temporary class object that has not been bound to a 4081 // reference (12.2) would be copied/moved to a class object 4082 // with the same cv-unqualified type, the copy/move operation 4083 // can be omitted by constructing the temporary object 4084 // directly into the target of the omitted copy/move 4085 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4086 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4087 Elidable = SubExpr->isTemporaryObject() && 4088 Context.hasSameUnqualifiedType(SubExpr->getType(), 4089 Context.getTypeDeclType(Constructor->getParent())); 4090 } 4091 4092 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4093 Elidable, move(ExprArgs), RequiresZeroInit, 4094 BaseInitialization); 4095} 4096 4097/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4098/// including handling of its default argument expressions. 4099Sema::OwningExprResult 4100Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4101 CXXConstructorDecl *Constructor, bool Elidable, 4102 MultiExprArg ExprArgs, 4103 bool RequiresZeroInit, 4104 bool BaseInitialization) { 4105 unsigned NumExprs = ExprArgs.size(); 4106 Expr **Exprs = (Expr **)ExprArgs.release(); 4107 4108 MarkDeclarationReferenced(ConstructLoc, Constructor); 4109 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4110 Constructor, Elidable, Exprs, NumExprs, 4111 RequiresZeroInit, BaseInitialization)); 4112} 4113 4114bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4115 CXXConstructorDecl *Constructor, 4116 MultiExprArg Exprs) { 4117 OwningExprResult TempResult = 4118 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4119 move(Exprs)); 4120 if (TempResult.isInvalid()) 4121 return true; 4122 4123 Expr *Temp = TempResult.takeAs<Expr>(); 4124 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4125 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4126 VD->setInit(Temp); 4127 4128 return false; 4129} 4130 4131void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4132 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4133 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4134 !ClassDecl->hasTrivialDestructor()) { 4135 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4136 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4137 CheckDestructorAccess(VD->getLocation(), Destructor, 4138 PDiag(diag::err_access_dtor_var) 4139 << VD->getDeclName() 4140 << VD->getType()); 4141 } 4142} 4143 4144/// AddCXXDirectInitializerToDecl - This action is called immediately after 4145/// ActOnDeclarator, when a C++ direct initializer is present. 4146/// e.g: "int x(1);" 4147void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4148 SourceLocation LParenLoc, 4149 MultiExprArg Exprs, 4150 SourceLocation *CommaLocs, 4151 SourceLocation RParenLoc) { 4152 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4153 Decl *RealDecl = Dcl.getAs<Decl>(); 4154 4155 // If there is no declaration, there was an error parsing it. Just ignore 4156 // the initializer. 4157 if (RealDecl == 0) 4158 return; 4159 4160 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4161 if (!VDecl) { 4162 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4163 RealDecl->setInvalidDecl(); 4164 return; 4165 } 4166 4167 // We will represent direct-initialization similarly to copy-initialization: 4168 // int x(1); -as-> int x = 1; 4169 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4170 // 4171 // Clients that want to distinguish between the two forms, can check for 4172 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4173 // A major benefit is that clients that don't particularly care about which 4174 // exactly form was it (like the CodeGen) can handle both cases without 4175 // special case code. 4176 4177 // C++ 8.5p11: 4178 // The form of initialization (using parentheses or '=') is generally 4179 // insignificant, but does matter when the entity being initialized has a 4180 // class type. 4181 QualType DeclInitType = VDecl->getType(); 4182 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4183 DeclInitType = Context.getBaseElementType(Array); 4184 4185 if (!VDecl->getType()->isDependentType() && 4186 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4187 diag::err_typecheck_decl_incomplete_type)) { 4188 VDecl->setInvalidDecl(); 4189 return; 4190 } 4191 4192 // The variable can not have an abstract class type. 4193 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4194 diag::err_abstract_type_in_decl, 4195 AbstractVariableType)) 4196 VDecl->setInvalidDecl(); 4197 4198 const VarDecl *Def; 4199 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4200 Diag(VDecl->getLocation(), diag::err_redefinition) 4201 << VDecl->getDeclName(); 4202 Diag(Def->getLocation(), diag::note_previous_definition); 4203 VDecl->setInvalidDecl(); 4204 return; 4205 } 4206 4207 // If either the declaration has a dependent type or if any of the 4208 // expressions is type-dependent, we represent the initialization 4209 // via a ParenListExpr for later use during template instantiation. 4210 if (VDecl->getType()->isDependentType() || 4211 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4212 // Let clients know that initialization was done with a direct initializer. 4213 VDecl->setCXXDirectInitializer(true); 4214 4215 // Store the initialization expressions as a ParenListExpr. 4216 unsigned NumExprs = Exprs.size(); 4217 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4218 (Expr **)Exprs.release(), 4219 NumExprs, RParenLoc)); 4220 return; 4221 } 4222 4223 // Capture the variable that is being initialized and the style of 4224 // initialization. 4225 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4226 4227 // FIXME: Poor source location information. 4228 InitializationKind Kind 4229 = InitializationKind::CreateDirect(VDecl->getLocation(), 4230 LParenLoc, RParenLoc); 4231 4232 InitializationSequence InitSeq(*this, Entity, Kind, 4233 (Expr**)Exprs.get(), Exprs.size()); 4234 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4235 if (Result.isInvalid()) { 4236 VDecl->setInvalidDecl(); 4237 return; 4238 } 4239 4240 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4241 VDecl->setInit(Result.takeAs<Expr>()); 4242 VDecl->setCXXDirectInitializer(true); 4243 4244 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4245 FinalizeVarWithDestructor(VDecl, Record); 4246} 4247 4248/// \brief Add the applicable constructor candidates for an initialization 4249/// by constructor. 4250static void AddConstructorInitializationCandidates(Sema &SemaRef, 4251 QualType ClassType, 4252 Expr **Args, 4253 unsigned NumArgs, 4254 InitializationKind Kind, 4255 OverloadCandidateSet &CandidateSet) { 4256 // C++ [dcl.init]p14: 4257 // If the initialization is direct-initialization, or if it is 4258 // copy-initialization where the cv-unqualified version of the 4259 // source type is the same class as, or a derived class of, the 4260 // class of the destination, constructors are considered. The 4261 // applicable constructors are enumerated (13.3.1.3), and the 4262 // best one is chosen through overload resolution (13.3). The 4263 // constructor so selected is called to initialize the object, 4264 // with the initializer expression(s) as its argument(s). If no 4265 // constructor applies, or the overload resolution is ambiguous, 4266 // the initialization is ill-formed. 4267 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4268 assert(ClassRec && "Can only initialize a class type here"); 4269 4270 // FIXME: When we decide not to synthesize the implicitly-declared 4271 // constructors, we'll need to make them appear here. 4272 4273 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4274 DeclarationName ConstructorName 4275 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4276 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4277 DeclContext::lookup_const_iterator Con, ConEnd; 4278 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4279 Con != ConEnd; ++Con) { 4280 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4281 4282 // Find the constructor (which may be a template). 4283 CXXConstructorDecl *Constructor = 0; 4284 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4285 if (ConstructorTmpl) 4286 Constructor 4287 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4288 else 4289 Constructor = cast<CXXConstructorDecl>(*Con); 4290 4291 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4292 (Kind.getKind() == InitializationKind::IK_Value) || 4293 (Kind.getKind() == InitializationKind::IK_Copy && 4294 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4295 ((Kind.getKind() == InitializationKind::IK_Default) && 4296 Constructor->isDefaultConstructor())) { 4297 if (ConstructorTmpl) 4298 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4299 /*ExplicitArgs*/ 0, 4300 Args, NumArgs, CandidateSet); 4301 else 4302 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4303 Args, NumArgs, CandidateSet); 4304 } 4305 } 4306} 4307 4308/// \brief Attempt to perform initialization by constructor 4309/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4310/// copy-initialization. 4311/// 4312/// This routine determines whether initialization by constructor is possible, 4313/// but it does not emit any diagnostics in the case where the initialization 4314/// is ill-formed. 4315/// 4316/// \param ClassType the type of the object being initialized, which must have 4317/// class type. 4318/// 4319/// \param Args the arguments provided to initialize the object 4320/// 4321/// \param NumArgs the number of arguments provided to initialize the object 4322/// 4323/// \param Kind the type of initialization being performed 4324/// 4325/// \returns the constructor used to initialize the object, if successful. 4326/// Otherwise, emits a diagnostic and returns NULL. 4327CXXConstructorDecl * 4328Sema::TryInitializationByConstructor(QualType ClassType, 4329 Expr **Args, unsigned NumArgs, 4330 SourceLocation Loc, 4331 InitializationKind Kind) { 4332 // Build the overload candidate set 4333 OverloadCandidateSet CandidateSet(Loc); 4334 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4335 CandidateSet); 4336 4337 // Determine whether we found a constructor we can use. 4338 OverloadCandidateSet::iterator Best; 4339 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4340 case OR_Success: 4341 case OR_Deleted: 4342 // We found a constructor. Return it. 4343 return cast<CXXConstructorDecl>(Best->Function); 4344 4345 case OR_No_Viable_Function: 4346 case OR_Ambiguous: 4347 // Overload resolution failed. Return nothing. 4348 return 0; 4349 } 4350 4351 // Silence GCC warning 4352 return 0; 4353} 4354 4355/// \brief Given a constructor and the set of arguments provided for the 4356/// constructor, convert the arguments and add any required default arguments 4357/// to form a proper call to this constructor. 4358/// 4359/// \returns true if an error occurred, false otherwise. 4360bool 4361Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4362 MultiExprArg ArgsPtr, 4363 SourceLocation Loc, 4364 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4365 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4366 unsigned NumArgs = ArgsPtr.size(); 4367 Expr **Args = (Expr **)ArgsPtr.get(); 4368 4369 const FunctionProtoType *Proto 4370 = Constructor->getType()->getAs<FunctionProtoType>(); 4371 assert(Proto && "Constructor without a prototype?"); 4372 unsigned NumArgsInProto = Proto->getNumArgs(); 4373 4374 // If too few arguments are available, we'll fill in the rest with defaults. 4375 if (NumArgs < NumArgsInProto) 4376 ConvertedArgs.reserve(NumArgsInProto); 4377 else 4378 ConvertedArgs.reserve(NumArgs); 4379 4380 VariadicCallType CallType = 4381 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4382 llvm::SmallVector<Expr *, 8> AllArgs; 4383 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4384 Proto, 0, Args, NumArgs, AllArgs, 4385 CallType); 4386 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4387 ConvertedArgs.push_back(AllArgs[i]); 4388 return Invalid; 4389} 4390 4391/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4392/// determine whether they are reference-related, 4393/// reference-compatible, reference-compatible with added 4394/// qualification, or incompatible, for use in C++ initialization by 4395/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4396/// type, and the first type (T1) is the pointee type of the reference 4397/// type being initialized. 4398Sema::ReferenceCompareResult 4399Sema::CompareReferenceRelationship(SourceLocation Loc, 4400 QualType OrigT1, QualType OrigT2, 4401 bool& DerivedToBase) { 4402 assert(!OrigT1->isReferenceType() && 4403 "T1 must be the pointee type of the reference type"); 4404 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4405 4406 QualType T1 = Context.getCanonicalType(OrigT1); 4407 QualType T2 = Context.getCanonicalType(OrigT2); 4408 Qualifiers T1Quals, T2Quals; 4409 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4410 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4411 4412 // C++ [dcl.init.ref]p4: 4413 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4414 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4415 // T1 is a base class of T2. 4416 if (UnqualT1 == UnqualT2) 4417 DerivedToBase = false; 4418 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4419 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4420 IsDerivedFrom(UnqualT2, UnqualT1)) 4421 DerivedToBase = true; 4422 else 4423 return Ref_Incompatible; 4424 4425 // At this point, we know that T1 and T2 are reference-related (at 4426 // least). 4427 4428 // If the type is an array type, promote the element qualifiers to the type 4429 // for comparison. 4430 if (isa<ArrayType>(T1) && T1Quals) 4431 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4432 if (isa<ArrayType>(T2) && T2Quals) 4433 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4434 4435 // C++ [dcl.init.ref]p4: 4436 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4437 // reference-related to T2 and cv1 is the same cv-qualification 4438 // as, or greater cv-qualification than, cv2. For purposes of 4439 // overload resolution, cases for which cv1 is greater 4440 // cv-qualification than cv2 are identified as 4441 // reference-compatible with added qualification (see 13.3.3.2). 4442 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4443 return Ref_Compatible; 4444 else if (T1.isMoreQualifiedThan(T2)) 4445 return Ref_Compatible_With_Added_Qualification; 4446 else 4447 return Ref_Related; 4448} 4449 4450/// CheckReferenceInit - Check the initialization of a reference 4451/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4452/// the initializer (either a simple initializer or an initializer 4453/// list), and DeclType is the type of the declaration. When ICS is 4454/// non-null, this routine will compute the implicit conversion 4455/// sequence according to C++ [over.ics.ref] and will not produce any 4456/// diagnostics; when ICS is null, it will emit diagnostics when any 4457/// errors are found. Either way, a return value of true indicates 4458/// that there was a failure, a return value of false indicates that 4459/// the reference initialization succeeded. 4460/// 4461/// When @p SuppressUserConversions, user-defined conversions are 4462/// suppressed. 4463/// When @p AllowExplicit, we also permit explicit user-defined 4464/// conversion functions. 4465/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4466/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4467/// This is used when this is called from a C-style cast. 4468bool 4469Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4470 SourceLocation DeclLoc, 4471 bool SuppressUserConversions, 4472 bool AllowExplicit, bool ForceRValue, 4473 ImplicitConversionSequence *ICS, 4474 bool IgnoreBaseAccess) { 4475 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4476 4477 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4478 QualType T2 = Init->getType(); 4479 4480 // If the initializer is the address of an overloaded function, try 4481 // to resolve the overloaded function. If all goes well, T2 is the 4482 // type of the resulting function. 4483 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4484 DeclAccessPair Found; 4485 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4486 ICS != 0, Found); 4487 if (Fn) { 4488 // Since we're performing this reference-initialization for 4489 // real, update the initializer with the resulting function. 4490 if (!ICS) { 4491 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4492 return true; 4493 4494 CheckAddressOfMemberAccess(Init, Found); 4495 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4496 } 4497 4498 T2 = Fn->getType(); 4499 } 4500 } 4501 4502 // Compute some basic properties of the types and the initializer. 4503 bool isRValRef = DeclType->isRValueReferenceType(); 4504 bool DerivedToBase = false; 4505 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4506 Init->isLvalue(Context); 4507 ReferenceCompareResult RefRelationship 4508 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4509 4510 // Most paths end in a failed conversion. 4511 if (ICS) { 4512 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4513 } 4514 4515 // C++ [dcl.init.ref]p5: 4516 // A reference to type "cv1 T1" is initialized by an expression 4517 // of type "cv2 T2" as follows: 4518 4519 // -- If the initializer expression 4520 4521 // Rvalue references cannot bind to lvalues (N2812). 4522 // There is absolutely no situation where they can. In particular, note that 4523 // this is ill-formed, even if B has a user-defined conversion to A&&: 4524 // B b; 4525 // A&& r = b; 4526 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4527 if (!ICS) 4528 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4529 << Init->getSourceRange(); 4530 return true; 4531 } 4532 4533 bool BindsDirectly = false; 4534 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4535 // reference-compatible with "cv2 T2," or 4536 // 4537 // Note that the bit-field check is skipped if we are just computing 4538 // the implicit conversion sequence (C++ [over.best.ics]p2). 4539 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4540 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4541 BindsDirectly = true; 4542 4543 if (ICS) { 4544 // C++ [over.ics.ref]p1: 4545 // When a parameter of reference type binds directly (8.5.3) 4546 // to an argument expression, the implicit conversion sequence 4547 // is the identity conversion, unless the argument expression 4548 // has a type that is a derived class of the parameter type, 4549 // in which case the implicit conversion sequence is a 4550 // derived-to-base Conversion (13.3.3.1). 4551 ICS->setStandard(); 4552 ICS->Standard.First = ICK_Identity; 4553 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4554 ICS->Standard.Third = ICK_Identity; 4555 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4556 ICS->Standard.setToType(0, T2); 4557 ICS->Standard.setToType(1, T1); 4558 ICS->Standard.setToType(2, T1); 4559 ICS->Standard.ReferenceBinding = true; 4560 ICS->Standard.DirectBinding = true; 4561 ICS->Standard.RRefBinding = false; 4562 ICS->Standard.CopyConstructor = 0; 4563 4564 // Nothing more to do: the inaccessibility/ambiguity check for 4565 // derived-to-base conversions is suppressed when we're 4566 // computing the implicit conversion sequence (C++ 4567 // [over.best.ics]p2). 4568 return false; 4569 } else { 4570 // Perform the conversion. 4571 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4572 if (DerivedToBase) 4573 CK = CastExpr::CK_DerivedToBase; 4574 else if(CheckExceptionSpecCompatibility(Init, T1)) 4575 return true; 4576 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4577 } 4578 } 4579 4580 // -- has a class type (i.e., T2 is a class type), where T1 is 4581 // not reference-related to T2, and can be implicitly 4582 // converted to an lvalue of type "cv3 T3," where "cv1 T1" 4583 // is reference-compatible with "cv3 T3" 92) (this 4584 // conversion is selected by enumerating the applicable 4585 // conversion functions (13.3.1.6) and choosing the best 4586 // one through overload resolution (13.3)), 4587 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4588 !RequireCompleteType(DeclLoc, T2, 0) && 4589 RefRelationship == Ref_Incompatible) { 4590 CXXRecordDecl *T2RecordDecl 4591 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4592 4593 OverloadCandidateSet CandidateSet(DeclLoc); 4594 const UnresolvedSetImpl *Conversions 4595 = T2RecordDecl->getVisibleConversionFunctions(); 4596 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4597 E = Conversions->end(); I != E; ++I) { 4598 NamedDecl *D = *I; 4599 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4600 if (isa<UsingShadowDecl>(D)) 4601 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4602 4603 FunctionTemplateDecl *ConvTemplate 4604 = dyn_cast<FunctionTemplateDecl>(D); 4605 CXXConversionDecl *Conv; 4606 if (ConvTemplate) 4607 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4608 else 4609 Conv = cast<CXXConversionDecl>(D); 4610 4611 // If the conversion function doesn't return a reference type, 4612 // it can't be considered for this conversion. 4613 if (Conv->getConversionType()->isLValueReferenceType() && 4614 (AllowExplicit || !Conv->isExplicit())) { 4615 if (ConvTemplate) 4616 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4617 Init, DeclType, CandidateSet); 4618 else 4619 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4620 DeclType, CandidateSet); 4621 } 4622 } 4623 4624 OverloadCandidateSet::iterator Best; 4625 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4626 case OR_Success: 4627 // C++ [over.ics.ref]p1: 4628 // 4629 // [...] If the parameter binds directly to the result of 4630 // applying a conversion function to the argument 4631 // expression, the implicit conversion sequence is a 4632 // user-defined conversion sequence (13.3.3.1.2), with the 4633 // second standard conversion sequence either an identity 4634 // conversion or, if the conversion function returns an 4635 // entity of a type that is a derived class of the parameter 4636 // type, a derived-to-base Conversion. 4637 if (!Best->FinalConversion.DirectBinding) 4638 break; 4639 4640 // This is a direct binding. 4641 BindsDirectly = true; 4642 4643 if (ICS) { 4644 ICS->setUserDefined(); 4645 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4646 ICS->UserDefined.After = Best->FinalConversion; 4647 ICS->UserDefined.ConversionFunction = Best->Function; 4648 ICS->UserDefined.EllipsisConversion = false; 4649 assert(ICS->UserDefined.After.ReferenceBinding && 4650 ICS->UserDefined.After.DirectBinding && 4651 "Expected a direct reference binding!"); 4652 return false; 4653 } else { 4654 OwningExprResult InitConversion = 4655 BuildCXXCastArgument(DeclLoc, QualType(), 4656 CastExpr::CK_UserDefinedConversion, 4657 cast<CXXMethodDecl>(Best->Function), 4658 Owned(Init)); 4659 Init = InitConversion.takeAs<Expr>(); 4660 4661 if (CheckExceptionSpecCompatibility(Init, T1)) 4662 return true; 4663 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4664 /*isLvalue=*/true); 4665 } 4666 break; 4667 4668 case OR_Ambiguous: 4669 if (ICS) { 4670 ICS->setAmbiguous(); 4671 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4672 Cand != CandidateSet.end(); ++Cand) 4673 if (Cand->Viable) 4674 ICS->Ambiguous.addConversion(Cand->Function); 4675 break; 4676 } 4677 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4678 << Init->getSourceRange(); 4679 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4680 return true; 4681 4682 case OR_No_Viable_Function: 4683 case OR_Deleted: 4684 // There was no suitable conversion, or we found a deleted 4685 // conversion; continue with other checks. 4686 break; 4687 } 4688 } 4689 4690 if (BindsDirectly) { 4691 // C++ [dcl.init.ref]p4: 4692 // [...] In all cases where the reference-related or 4693 // reference-compatible relationship of two types is used to 4694 // establish the validity of a reference binding, and T1 is a 4695 // base class of T2, a program that necessitates such a binding 4696 // is ill-formed if T1 is an inaccessible (clause 11) or 4697 // ambiguous (10.2) base class of T2. 4698 // 4699 // Note that we only check this condition when we're allowed to 4700 // complain about errors, because we should not be checking for 4701 // ambiguity (or inaccessibility) unless the reference binding 4702 // actually happens. 4703 if (DerivedToBase) 4704 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4705 Init->getSourceRange(), 4706 IgnoreBaseAccess); 4707 else 4708 return false; 4709 } 4710 4711 // -- Otherwise, the reference shall be to a non-volatile const 4712 // type (i.e., cv1 shall be const), or the reference shall be an 4713 // rvalue reference and the initializer expression shall be an rvalue. 4714 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4715 if (!ICS) 4716 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4717 << T1.isVolatileQualified() 4718 << T1 << int(InitLvalue != Expr::LV_Valid) 4719 << T2 << Init->getSourceRange(); 4720 return true; 4721 } 4722 4723 // -- If the initializer expression is an rvalue, with T2 a 4724 // class type, and "cv1 T1" is reference-compatible with 4725 // "cv2 T2," the reference is bound in one of the 4726 // following ways (the choice is implementation-defined): 4727 // 4728 // -- The reference is bound to the object represented by 4729 // the rvalue (see 3.10) or to a sub-object within that 4730 // object. 4731 // 4732 // -- A temporary of type "cv1 T2" [sic] is created, and 4733 // a constructor is called to copy the entire rvalue 4734 // object into the temporary. The reference is bound to 4735 // the temporary or to a sub-object within the 4736 // temporary. 4737 // 4738 // The constructor that would be used to make the copy 4739 // shall be callable whether or not the copy is actually 4740 // done. 4741 // 4742 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4743 // freedom, so we will always take the first option and never build 4744 // a temporary in this case. FIXME: We will, however, have to check 4745 // for the presence of a copy constructor in C++98/03 mode. 4746 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4747 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4748 if (ICS) { 4749 ICS->setStandard(); 4750 ICS->Standard.First = ICK_Identity; 4751 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4752 ICS->Standard.Third = ICK_Identity; 4753 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4754 ICS->Standard.setToType(0, T2); 4755 ICS->Standard.setToType(1, T1); 4756 ICS->Standard.setToType(2, T1); 4757 ICS->Standard.ReferenceBinding = true; 4758 ICS->Standard.DirectBinding = false; 4759 ICS->Standard.RRefBinding = isRValRef; 4760 ICS->Standard.CopyConstructor = 0; 4761 } else { 4762 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4763 if (DerivedToBase) 4764 CK = CastExpr::CK_DerivedToBase; 4765 else if(CheckExceptionSpecCompatibility(Init, T1)) 4766 return true; 4767 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4768 } 4769 return false; 4770 } 4771 4772 // -- Otherwise, a temporary of type "cv1 T1" is created and 4773 // initialized from the initializer expression using the 4774 // rules for a non-reference copy initialization (8.5). The 4775 // reference is then bound to the temporary. If T1 is 4776 // reference-related to T2, cv1 must be the same 4777 // cv-qualification as, or greater cv-qualification than, 4778 // cv2; otherwise, the program is ill-formed. 4779 if (RefRelationship == Ref_Related) { 4780 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4781 // we would be reference-compatible or reference-compatible with 4782 // added qualification. But that wasn't the case, so the reference 4783 // initialization fails. 4784 if (!ICS) 4785 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4786 << T1 << int(InitLvalue != Expr::LV_Valid) 4787 << T2 << Init->getSourceRange(); 4788 return true; 4789 } 4790 4791 // If at least one of the types is a class type, the types are not 4792 // related, and we aren't allowed any user conversions, the 4793 // reference binding fails. This case is important for breaking 4794 // recursion, since TryImplicitConversion below will attempt to 4795 // create a temporary through the use of a copy constructor. 4796 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4797 (T1->isRecordType() || T2->isRecordType())) { 4798 if (!ICS) 4799 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4800 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4801 return true; 4802 } 4803 4804 // Actually try to convert the initializer to T1. 4805 if (ICS) { 4806 // C++ [over.ics.ref]p2: 4807 // 4808 // When a parameter of reference type is not bound directly to 4809 // an argument expression, the conversion sequence is the one 4810 // required to convert the argument expression to the 4811 // underlying type of the reference according to 4812 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4813 // to copy-initializing a temporary of the underlying type with 4814 // the argument expression. Any difference in top-level 4815 // cv-qualification is subsumed by the initialization itself 4816 // and does not constitute a conversion. 4817 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4818 /*AllowExplicit=*/false, 4819 /*ForceRValue=*/false, 4820 /*InOverloadResolution=*/false); 4821 4822 // Of course, that's still a reference binding. 4823 if (ICS->isStandard()) { 4824 ICS->Standard.ReferenceBinding = true; 4825 ICS->Standard.RRefBinding = isRValRef; 4826 } else if (ICS->isUserDefined()) { 4827 ICS->UserDefined.After.ReferenceBinding = true; 4828 ICS->UserDefined.After.RRefBinding = isRValRef; 4829 } 4830 return ICS->isBad(); 4831 } else { 4832 ImplicitConversionSequence Conversions; 4833 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4834 false, false, 4835 Conversions); 4836 if (badConversion) { 4837 if (Conversions.isAmbiguous()) { 4838 Diag(DeclLoc, 4839 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4840 for (int j = Conversions.Ambiguous.conversions().size()-1; 4841 j >= 0; j--) { 4842 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4843 NoteOverloadCandidate(Func); 4844 } 4845 } 4846 else { 4847 if (isRValRef) 4848 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4849 << Init->getSourceRange(); 4850 else 4851 Diag(DeclLoc, diag::err_invalid_initialization) 4852 << DeclType << Init->getType() << Init->getSourceRange(); 4853 } 4854 } 4855 return badConversion; 4856 } 4857} 4858 4859static inline bool 4860CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4861 const FunctionDecl *FnDecl) { 4862 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4863 if (isa<NamespaceDecl>(DC)) { 4864 return SemaRef.Diag(FnDecl->getLocation(), 4865 diag::err_operator_new_delete_declared_in_namespace) 4866 << FnDecl->getDeclName(); 4867 } 4868 4869 if (isa<TranslationUnitDecl>(DC) && 4870 FnDecl->getStorageClass() == FunctionDecl::Static) { 4871 return SemaRef.Diag(FnDecl->getLocation(), 4872 diag::err_operator_new_delete_declared_static) 4873 << FnDecl->getDeclName(); 4874 } 4875 4876 return false; 4877} 4878 4879static inline bool 4880CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4881 CanQualType ExpectedResultType, 4882 CanQualType ExpectedFirstParamType, 4883 unsigned DependentParamTypeDiag, 4884 unsigned InvalidParamTypeDiag) { 4885 QualType ResultType = 4886 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4887 4888 // Check that the result type is not dependent. 4889 if (ResultType->isDependentType()) 4890 return SemaRef.Diag(FnDecl->getLocation(), 4891 diag::err_operator_new_delete_dependent_result_type) 4892 << FnDecl->getDeclName() << ExpectedResultType; 4893 4894 // Check that the result type is what we expect. 4895 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4896 return SemaRef.Diag(FnDecl->getLocation(), 4897 diag::err_operator_new_delete_invalid_result_type) 4898 << FnDecl->getDeclName() << ExpectedResultType; 4899 4900 // A function template must have at least 2 parameters. 4901 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4902 return SemaRef.Diag(FnDecl->getLocation(), 4903 diag::err_operator_new_delete_template_too_few_parameters) 4904 << FnDecl->getDeclName(); 4905 4906 // The function decl must have at least 1 parameter. 4907 if (FnDecl->getNumParams() == 0) 4908 return SemaRef.Diag(FnDecl->getLocation(), 4909 diag::err_operator_new_delete_too_few_parameters) 4910 << FnDecl->getDeclName(); 4911 4912 // Check the the first parameter type is not dependent. 4913 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4914 if (FirstParamType->isDependentType()) 4915 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4916 << FnDecl->getDeclName() << ExpectedFirstParamType; 4917 4918 // Check that the first parameter type is what we expect. 4919 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4920 ExpectedFirstParamType) 4921 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4922 << FnDecl->getDeclName() << ExpectedFirstParamType; 4923 4924 return false; 4925} 4926 4927static bool 4928CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4929 // C++ [basic.stc.dynamic.allocation]p1: 4930 // A program is ill-formed if an allocation function is declared in a 4931 // namespace scope other than global scope or declared static in global 4932 // scope. 4933 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4934 return true; 4935 4936 CanQualType SizeTy = 4937 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4938 4939 // C++ [basic.stc.dynamic.allocation]p1: 4940 // The return type shall be void*. The first parameter shall have type 4941 // std::size_t. 4942 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4943 SizeTy, 4944 diag::err_operator_new_dependent_param_type, 4945 diag::err_operator_new_param_type)) 4946 return true; 4947 4948 // C++ [basic.stc.dynamic.allocation]p1: 4949 // The first parameter shall not have an associated default argument. 4950 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4951 return SemaRef.Diag(FnDecl->getLocation(), 4952 diag::err_operator_new_default_arg) 4953 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4954 4955 return false; 4956} 4957 4958static bool 4959CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4960 // C++ [basic.stc.dynamic.deallocation]p1: 4961 // A program is ill-formed if deallocation functions are declared in a 4962 // namespace scope other than global scope or declared static in global 4963 // scope. 4964 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4965 return true; 4966 4967 // C++ [basic.stc.dynamic.deallocation]p2: 4968 // Each deallocation function shall return void and its first parameter 4969 // shall be void*. 4970 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4971 SemaRef.Context.VoidPtrTy, 4972 diag::err_operator_delete_dependent_param_type, 4973 diag::err_operator_delete_param_type)) 4974 return true; 4975 4976 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4977 if (FirstParamType->isDependentType()) 4978 return SemaRef.Diag(FnDecl->getLocation(), 4979 diag::err_operator_delete_dependent_param_type) 4980 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4981 4982 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4983 SemaRef.Context.VoidPtrTy) 4984 return SemaRef.Diag(FnDecl->getLocation(), 4985 diag::err_operator_delete_param_type) 4986 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4987 4988 return false; 4989} 4990 4991/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4992/// of this overloaded operator is well-formed. If so, returns false; 4993/// otherwise, emits appropriate diagnostics and returns true. 4994bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4995 assert(FnDecl && FnDecl->isOverloadedOperator() && 4996 "Expected an overloaded operator declaration"); 4997 4998 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4999 5000 // C++ [over.oper]p5: 5001 // The allocation and deallocation functions, operator new, 5002 // operator new[], operator delete and operator delete[], are 5003 // described completely in 3.7.3. The attributes and restrictions 5004 // found in the rest of this subclause do not apply to them unless 5005 // explicitly stated in 3.7.3. 5006 if (Op == OO_Delete || Op == OO_Array_Delete) 5007 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5008 5009 if (Op == OO_New || Op == OO_Array_New) 5010 return CheckOperatorNewDeclaration(*this, FnDecl); 5011 5012 // C++ [over.oper]p6: 5013 // An operator function shall either be a non-static member 5014 // function or be a non-member function and have at least one 5015 // parameter whose type is a class, a reference to a class, an 5016 // enumeration, or a reference to an enumeration. 5017 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5018 if (MethodDecl->isStatic()) 5019 return Diag(FnDecl->getLocation(), 5020 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5021 } else { 5022 bool ClassOrEnumParam = false; 5023 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5024 ParamEnd = FnDecl->param_end(); 5025 Param != ParamEnd; ++Param) { 5026 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5027 if (ParamType->isDependentType() || ParamType->isRecordType() || 5028 ParamType->isEnumeralType()) { 5029 ClassOrEnumParam = true; 5030 break; 5031 } 5032 } 5033 5034 if (!ClassOrEnumParam) 5035 return Diag(FnDecl->getLocation(), 5036 diag::err_operator_overload_needs_class_or_enum) 5037 << FnDecl->getDeclName(); 5038 } 5039 5040 // C++ [over.oper]p8: 5041 // An operator function cannot have default arguments (8.3.6), 5042 // except where explicitly stated below. 5043 // 5044 // Only the function-call operator allows default arguments 5045 // (C++ [over.call]p1). 5046 if (Op != OO_Call) { 5047 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5048 Param != FnDecl->param_end(); ++Param) { 5049 if ((*Param)->hasDefaultArg()) 5050 return Diag((*Param)->getLocation(), 5051 diag::err_operator_overload_default_arg) 5052 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5053 } 5054 } 5055 5056 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5057 { false, false, false } 5058#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5059 , { Unary, Binary, MemberOnly } 5060#include "clang/Basic/OperatorKinds.def" 5061 }; 5062 5063 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5064 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5065 bool MustBeMemberOperator = OperatorUses[Op][2]; 5066 5067 // C++ [over.oper]p8: 5068 // [...] Operator functions cannot have more or fewer parameters 5069 // than the number required for the corresponding operator, as 5070 // described in the rest of this subclause. 5071 unsigned NumParams = FnDecl->getNumParams() 5072 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5073 if (Op != OO_Call && 5074 ((NumParams == 1 && !CanBeUnaryOperator) || 5075 (NumParams == 2 && !CanBeBinaryOperator) || 5076 (NumParams < 1) || (NumParams > 2))) { 5077 // We have the wrong number of parameters. 5078 unsigned ErrorKind; 5079 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5080 ErrorKind = 2; // 2 -> unary or binary. 5081 } else if (CanBeUnaryOperator) { 5082 ErrorKind = 0; // 0 -> unary 5083 } else { 5084 assert(CanBeBinaryOperator && 5085 "All non-call overloaded operators are unary or binary!"); 5086 ErrorKind = 1; // 1 -> binary 5087 } 5088 5089 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5090 << FnDecl->getDeclName() << NumParams << ErrorKind; 5091 } 5092 5093 // Overloaded operators other than operator() cannot be variadic. 5094 if (Op != OO_Call && 5095 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5096 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5097 << FnDecl->getDeclName(); 5098 } 5099 5100 // Some operators must be non-static member functions. 5101 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5102 return Diag(FnDecl->getLocation(), 5103 diag::err_operator_overload_must_be_member) 5104 << FnDecl->getDeclName(); 5105 } 5106 5107 // C++ [over.inc]p1: 5108 // The user-defined function called operator++ implements the 5109 // prefix and postfix ++ operator. If this function is a member 5110 // function with no parameters, or a non-member function with one 5111 // parameter of class or enumeration type, it defines the prefix 5112 // increment operator ++ for objects of that type. If the function 5113 // is a member function with one parameter (which shall be of type 5114 // int) or a non-member function with two parameters (the second 5115 // of which shall be of type int), it defines the postfix 5116 // increment operator ++ for objects of that type. 5117 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5118 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5119 bool ParamIsInt = false; 5120 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5121 ParamIsInt = BT->getKind() == BuiltinType::Int; 5122 5123 if (!ParamIsInt) 5124 return Diag(LastParam->getLocation(), 5125 diag::err_operator_overload_post_incdec_must_be_int) 5126 << LastParam->getType() << (Op == OO_MinusMinus); 5127 } 5128 5129 // Notify the class if it got an assignment operator. 5130 if (Op == OO_Equal) { 5131 // Would have returned earlier otherwise. 5132 assert(isa<CXXMethodDecl>(FnDecl) && 5133 "Overloaded = not member, but not filtered."); 5134 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5135 Method->getParent()->addedAssignmentOperator(Context, Method); 5136 } 5137 5138 return false; 5139} 5140 5141/// CheckLiteralOperatorDeclaration - Check whether the declaration 5142/// of this literal operator function is well-formed. If so, returns 5143/// false; otherwise, emits appropriate diagnostics and returns true. 5144bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5145 DeclContext *DC = FnDecl->getDeclContext(); 5146 Decl::Kind Kind = DC->getDeclKind(); 5147 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5148 Kind != Decl::LinkageSpec) { 5149 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5150 << FnDecl->getDeclName(); 5151 return true; 5152 } 5153 5154 bool Valid = false; 5155 5156 // template <char...> type operator "" name() is the only valid template 5157 // signature, and the only valid signature with no parameters. 5158 if (FnDecl->param_size() == 0) { 5159 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5160 // Must have only one template parameter 5161 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5162 if (Params->size() == 1) { 5163 NonTypeTemplateParmDecl *PmDecl = 5164 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5165 5166 // The template parameter must be a char parameter pack. 5167 // FIXME: This test will always fail because non-type parameter packs 5168 // have not been implemented. 5169 if (PmDecl && PmDecl->isTemplateParameterPack() && 5170 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5171 Valid = true; 5172 } 5173 } 5174 } else { 5175 // Check the first parameter 5176 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5177 5178 QualType T = (*Param)->getType(); 5179 5180 // unsigned long long int, long double, and any character type are allowed 5181 // as the only parameters. 5182 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5183 Context.hasSameType(T, Context.LongDoubleTy) || 5184 Context.hasSameType(T, Context.CharTy) || 5185 Context.hasSameType(T, Context.WCharTy) || 5186 Context.hasSameType(T, Context.Char16Ty) || 5187 Context.hasSameType(T, Context.Char32Ty)) { 5188 if (++Param == FnDecl->param_end()) 5189 Valid = true; 5190 goto FinishedParams; 5191 } 5192 5193 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5194 const PointerType *PT = T->getAs<PointerType>(); 5195 if (!PT) 5196 goto FinishedParams; 5197 T = PT->getPointeeType(); 5198 if (!T.isConstQualified()) 5199 goto FinishedParams; 5200 T = T.getUnqualifiedType(); 5201 5202 // Move on to the second parameter; 5203 ++Param; 5204 5205 // If there is no second parameter, the first must be a const char * 5206 if (Param == FnDecl->param_end()) { 5207 if (Context.hasSameType(T, Context.CharTy)) 5208 Valid = true; 5209 goto FinishedParams; 5210 } 5211 5212 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5213 // are allowed as the first parameter to a two-parameter function 5214 if (!(Context.hasSameType(T, Context.CharTy) || 5215 Context.hasSameType(T, Context.WCharTy) || 5216 Context.hasSameType(T, Context.Char16Ty) || 5217 Context.hasSameType(T, Context.Char32Ty))) 5218 goto FinishedParams; 5219 5220 // The second and final parameter must be an std::size_t 5221 T = (*Param)->getType().getUnqualifiedType(); 5222 if (Context.hasSameType(T, Context.getSizeType()) && 5223 ++Param == FnDecl->param_end()) 5224 Valid = true; 5225 } 5226 5227 // FIXME: This diagnostic is absolutely terrible. 5228FinishedParams: 5229 if (!Valid) { 5230 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5231 << FnDecl->getDeclName(); 5232 return true; 5233 } 5234 5235 return false; 5236} 5237 5238/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5239/// linkage specification, including the language and (if present) 5240/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5241/// the location of the language string literal, which is provided 5242/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5243/// the '{' brace. Otherwise, this linkage specification does not 5244/// have any braces. 5245Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5246 SourceLocation ExternLoc, 5247 SourceLocation LangLoc, 5248 const char *Lang, 5249 unsigned StrSize, 5250 SourceLocation LBraceLoc) { 5251 LinkageSpecDecl::LanguageIDs Language; 5252 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5253 Language = LinkageSpecDecl::lang_c; 5254 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5255 Language = LinkageSpecDecl::lang_cxx; 5256 else { 5257 Diag(LangLoc, diag::err_bad_language); 5258 return DeclPtrTy(); 5259 } 5260 5261 // FIXME: Add all the various semantics of linkage specifications 5262 5263 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5264 LangLoc, Language, 5265 LBraceLoc.isValid()); 5266 CurContext->addDecl(D); 5267 PushDeclContext(S, D); 5268 return DeclPtrTy::make(D); 5269} 5270 5271/// ActOnFinishLinkageSpecification - Completely the definition of 5272/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5273/// valid, it's the position of the closing '}' brace in a linkage 5274/// specification that uses braces. 5275Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5276 DeclPtrTy LinkageSpec, 5277 SourceLocation RBraceLoc) { 5278 if (LinkageSpec) 5279 PopDeclContext(); 5280 return LinkageSpec; 5281} 5282 5283/// \brief Perform semantic analysis for the variable declaration that 5284/// occurs within a C++ catch clause, returning the newly-created 5285/// variable. 5286VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5287 TypeSourceInfo *TInfo, 5288 IdentifierInfo *Name, 5289 SourceLocation Loc, 5290 SourceRange Range) { 5291 bool Invalid = false; 5292 5293 // Arrays and functions decay. 5294 if (ExDeclType->isArrayType()) 5295 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5296 else if (ExDeclType->isFunctionType()) 5297 ExDeclType = Context.getPointerType(ExDeclType); 5298 5299 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5300 // The exception-declaration shall not denote a pointer or reference to an 5301 // incomplete type, other than [cv] void*. 5302 // N2844 forbids rvalue references. 5303 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5304 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5305 Invalid = true; 5306 } 5307 5308 // GCC allows catching pointers and references to incomplete types 5309 // as an extension; so do we, but we warn by default. 5310 5311 QualType BaseType = ExDeclType; 5312 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5313 unsigned DK = diag::err_catch_incomplete; 5314 bool IncompleteCatchIsInvalid = true; 5315 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5316 BaseType = Ptr->getPointeeType(); 5317 Mode = 1; 5318 DK = diag::ext_catch_incomplete_ptr; 5319 IncompleteCatchIsInvalid = false; 5320 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5321 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5322 BaseType = Ref->getPointeeType(); 5323 Mode = 2; 5324 DK = diag::ext_catch_incomplete_ref; 5325 IncompleteCatchIsInvalid = false; 5326 } 5327 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5328 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5329 IncompleteCatchIsInvalid) 5330 Invalid = true; 5331 5332 if (!Invalid && !ExDeclType->isDependentType() && 5333 RequireNonAbstractType(Loc, ExDeclType, 5334 diag::err_abstract_type_in_decl, 5335 AbstractVariableType)) 5336 Invalid = true; 5337 5338 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5339 Name, ExDeclType, TInfo, VarDecl::None); 5340 5341 if (!Invalid) { 5342 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5343 // C++ [except.handle]p16: 5344 // The object declared in an exception-declaration or, if the 5345 // exception-declaration does not specify a name, a temporary (12.2) is 5346 // copy-initialized (8.5) from the exception object. [...] 5347 // The object is destroyed when the handler exits, after the destruction 5348 // of any automatic objects initialized within the handler. 5349 // 5350 // We just pretend to initialize the object with itself, then make sure 5351 // it can be destroyed later. 5352 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5353 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5354 Loc, ExDeclType, 0); 5355 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5356 SourceLocation()); 5357 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5358 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5359 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5360 if (Result.isInvalid()) 5361 Invalid = true; 5362 else 5363 FinalizeVarWithDestructor(ExDecl, RecordTy); 5364 } 5365 } 5366 5367 if (Invalid) 5368 ExDecl->setInvalidDecl(); 5369 5370 return ExDecl; 5371} 5372 5373/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5374/// handler. 5375Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5376 TypeSourceInfo *TInfo = 0; 5377 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5378 5379 bool Invalid = D.isInvalidType(); 5380 IdentifierInfo *II = D.getIdentifier(); 5381 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5382 // The scope should be freshly made just for us. There is just no way 5383 // it contains any previous declaration. 5384 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5385 if (PrevDecl->isTemplateParameter()) { 5386 // Maybe we will complain about the shadowed template parameter. 5387 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5388 } 5389 } 5390 5391 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5392 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5393 << D.getCXXScopeSpec().getRange(); 5394 Invalid = true; 5395 } 5396 5397 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5398 D.getIdentifier(), 5399 D.getIdentifierLoc(), 5400 D.getDeclSpec().getSourceRange()); 5401 5402 if (Invalid) 5403 ExDecl->setInvalidDecl(); 5404 5405 // Add the exception declaration into this scope. 5406 if (II) 5407 PushOnScopeChains(ExDecl, S); 5408 else 5409 CurContext->addDecl(ExDecl); 5410 5411 ProcessDeclAttributes(S, ExDecl, D); 5412 return DeclPtrTy::make(ExDecl); 5413} 5414 5415Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5416 ExprArg assertexpr, 5417 ExprArg assertmessageexpr) { 5418 Expr *AssertExpr = (Expr *)assertexpr.get(); 5419 StringLiteral *AssertMessage = 5420 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5421 5422 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5423 llvm::APSInt Value(32); 5424 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5425 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5426 AssertExpr->getSourceRange(); 5427 return DeclPtrTy(); 5428 } 5429 5430 if (Value == 0) { 5431 Diag(AssertLoc, diag::err_static_assert_failed) 5432 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5433 } 5434 } 5435 5436 assertexpr.release(); 5437 assertmessageexpr.release(); 5438 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5439 AssertExpr, AssertMessage); 5440 5441 CurContext->addDecl(Decl); 5442 return DeclPtrTy::make(Decl); 5443} 5444 5445/// \brief Perform semantic analysis of the given friend type declaration. 5446/// 5447/// \returns A friend declaration that. 5448FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5449 TypeSourceInfo *TSInfo) { 5450 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5451 5452 QualType T = TSInfo->getType(); 5453 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5454 5455 if (!getLangOptions().CPlusPlus0x) { 5456 // C++03 [class.friend]p2: 5457 // An elaborated-type-specifier shall be used in a friend declaration 5458 // for a class.* 5459 // 5460 // * The class-key of the elaborated-type-specifier is required. 5461 if (!ActiveTemplateInstantiations.empty()) { 5462 // Do not complain about the form of friend template types during 5463 // template instantiation; we will already have complained when the 5464 // template was declared. 5465 } else if (!T->isElaboratedTypeSpecifier()) { 5466 // If we evaluated the type to a record type, suggest putting 5467 // a tag in front. 5468 if (const RecordType *RT = T->getAs<RecordType>()) { 5469 RecordDecl *RD = RT->getDecl(); 5470 5471 std::string InsertionText = std::string(" ") + RD->getKindName(); 5472 5473 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5474 << (unsigned) RD->getTagKind() 5475 << T 5476 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5477 InsertionText); 5478 } else { 5479 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5480 << T 5481 << SourceRange(FriendLoc, TypeRange.getEnd()); 5482 } 5483 } else if (T->getAs<EnumType>()) { 5484 Diag(FriendLoc, diag::ext_enum_friend) 5485 << T 5486 << SourceRange(FriendLoc, TypeRange.getEnd()); 5487 } 5488 } 5489 5490 // C++0x [class.friend]p3: 5491 // If the type specifier in a friend declaration designates a (possibly 5492 // cv-qualified) class type, that class is declared as a friend; otherwise, 5493 // the friend declaration is ignored. 5494 5495 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5496 // in [class.friend]p3 that we do not implement. 5497 5498 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5499} 5500 5501/// Handle a friend type declaration. This works in tandem with 5502/// ActOnTag. 5503/// 5504/// Notes on friend class templates: 5505/// 5506/// We generally treat friend class declarations as if they were 5507/// declaring a class. So, for example, the elaborated type specifier 5508/// in a friend declaration is required to obey the restrictions of a 5509/// class-head (i.e. no typedefs in the scope chain), template 5510/// parameters are required to match up with simple template-ids, &c. 5511/// However, unlike when declaring a template specialization, it's 5512/// okay to refer to a template specialization without an empty 5513/// template parameter declaration, e.g. 5514/// friend class A<T>::B<unsigned>; 5515/// We permit this as a special case; if there are any template 5516/// parameters present at all, require proper matching, i.e. 5517/// template <> template <class T> friend class A<int>::B; 5518Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5519 MultiTemplateParamsArg TempParams) { 5520 SourceLocation Loc = DS.getSourceRange().getBegin(); 5521 5522 assert(DS.isFriendSpecified()); 5523 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5524 5525 // Try to convert the decl specifier to a type. This works for 5526 // friend templates because ActOnTag never produces a ClassTemplateDecl 5527 // for a TUK_Friend. 5528 Declarator TheDeclarator(DS, Declarator::MemberContext); 5529 TypeSourceInfo *TSI; 5530 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5531 if (TheDeclarator.isInvalidType()) 5532 return DeclPtrTy(); 5533 5534 if (!TSI) 5535 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5536 5537 // This is definitely an error in C++98. It's probably meant to 5538 // be forbidden in C++0x, too, but the specification is just 5539 // poorly written. 5540 // 5541 // The problem is with declarations like the following: 5542 // template <T> friend A<T>::foo; 5543 // where deciding whether a class C is a friend or not now hinges 5544 // on whether there exists an instantiation of A that causes 5545 // 'foo' to equal C. There are restrictions on class-heads 5546 // (which we declare (by fiat) elaborated friend declarations to 5547 // be) that makes this tractable. 5548 // 5549 // FIXME: handle "template <> friend class A<T>;", which 5550 // is possibly well-formed? Who even knows? 5551 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5552 Diag(Loc, diag::err_tagless_friend_type_template) 5553 << DS.getSourceRange(); 5554 return DeclPtrTy(); 5555 } 5556 5557 // C++98 [class.friend]p1: A friend of a class is a function 5558 // or class that is not a member of the class . . . 5559 // This is fixed in DR77, which just barely didn't make the C++03 5560 // deadline. It's also a very silly restriction that seriously 5561 // affects inner classes and which nobody else seems to implement; 5562 // thus we never diagnose it, not even in -pedantic. 5563 // 5564 // But note that we could warn about it: it's always useless to 5565 // friend one of your own members (it's not, however, worthless to 5566 // friend a member of an arbitrary specialization of your template). 5567 5568 Decl *D; 5569 if (unsigned NumTempParamLists = TempParams.size()) 5570 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5571 NumTempParamLists, 5572 (TemplateParameterList**) TempParams.release(), 5573 TSI, 5574 DS.getFriendSpecLoc()); 5575 else 5576 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5577 5578 if (!D) 5579 return DeclPtrTy(); 5580 5581 D->setAccess(AS_public); 5582 CurContext->addDecl(D); 5583 5584 return DeclPtrTy::make(D); 5585} 5586 5587Sema::DeclPtrTy 5588Sema::ActOnFriendFunctionDecl(Scope *S, 5589 Declarator &D, 5590 bool IsDefinition, 5591 MultiTemplateParamsArg TemplateParams) { 5592 const DeclSpec &DS = D.getDeclSpec(); 5593 5594 assert(DS.isFriendSpecified()); 5595 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5596 5597 SourceLocation Loc = D.getIdentifierLoc(); 5598 TypeSourceInfo *TInfo = 0; 5599 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5600 5601 // C++ [class.friend]p1 5602 // A friend of a class is a function or class.... 5603 // Note that this sees through typedefs, which is intended. 5604 // It *doesn't* see through dependent types, which is correct 5605 // according to [temp.arg.type]p3: 5606 // If a declaration acquires a function type through a 5607 // type dependent on a template-parameter and this causes 5608 // a declaration that does not use the syntactic form of a 5609 // function declarator to have a function type, the program 5610 // is ill-formed. 5611 if (!T->isFunctionType()) { 5612 Diag(Loc, diag::err_unexpected_friend); 5613 5614 // It might be worthwhile to try to recover by creating an 5615 // appropriate declaration. 5616 return DeclPtrTy(); 5617 } 5618 5619 // C++ [namespace.memdef]p3 5620 // - If a friend declaration in a non-local class first declares a 5621 // class or function, the friend class or function is a member 5622 // of the innermost enclosing namespace. 5623 // - The name of the friend is not found by simple name lookup 5624 // until a matching declaration is provided in that namespace 5625 // scope (either before or after the class declaration granting 5626 // friendship). 5627 // - If a friend function is called, its name may be found by the 5628 // name lookup that considers functions from namespaces and 5629 // classes associated with the types of the function arguments. 5630 // - When looking for a prior declaration of a class or a function 5631 // declared as a friend, scopes outside the innermost enclosing 5632 // namespace scope are not considered. 5633 5634 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5635 DeclarationName Name = GetNameForDeclarator(D); 5636 assert(Name); 5637 5638 // The context we found the declaration in, or in which we should 5639 // create the declaration. 5640 DeclContext *DC; 5641 5642 // FIXME: handle local classes 5643 5644 // Recover from invalid scope qualifiers as if they just weren't there. 5645 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5646 ForRedeclaration); 5647 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5648 // FIXME: RequireCompleteDeclContext 5649 DC = computeDeclContext(ScopeQual); 5650 5651 // FIXME: handle dependent contexts 5652 if (!DC) return DeclPtrTy(); 5653 5654 LookupQualifiedName(Previous, DC); 5655 5656 // If searching in that context implicitly found a declaration in 5657 // a different context, treat it like it wasn't found at all. 5658 // TODO: better diagnostics for this case. Suggesting the right 5659 // qualified scope would be nice... 5660 // FIXME: getRepresentativeDecl() is not right here at all 5661 if (Previous.empty() || 5662 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5663 D.setInvalidType(); 5664 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5665 return DeclPtrTy(); 5666 } 5667 5668 // C++ [class.friend]p1: A friend of a class is a function or 5669 // class that is not a member of the class . . . 5670 if (DC->Equals(CurContext)) 5671 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5672 5673 // Otherwise walk out to the nearest namespace scope looking for matches. 5674 } else { 5675 // TODO: handle local class contexts. 5676 5677 DC = CurContext; 5678 while (true) { 5679 // Skip class contexts. If someone can cite chapter and verse 5680 // for this behavior, that would be nice --- it's what GCC and 5681 // EDG do, and it seems like a reasonable intent, but the spec 5682 // really only says that checks for unqualified existing 5683 // declarations should stop at the nearest enclosing namespace, 5684 // not that they should only consider the nearest enclosing 5685 // namespace. 5686 while (DC->isRecord()) 5687 DC = DC->getParent(); 5688 5689 LookupQualifiedName(Previous, DC); 5690 5691 // TODO: decide what we think about using declarations. 5692 if (!Previous.empty()) 5693 break; 5694 5695 if (DC->isFileContext()) break; 5696 DC = DC->getParent(); 5697 } 5698 5699 // C++ [class.friend]p1: A friend of a class is a function or 5700 // class that is not a member of the class . . . 5701 // C++0x changes this for both friend types and functions. 5702 // Most C++ 98 compilers do seem to give an error here, so 5703 // we do, too. 5704 if (!Previous.empty() && DC->Equals(CurContext) 5705 && !getLangOptions().CPlusPlus0x) 5706 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5707 } 5708 5709 if (DC->isFileContext()) { 5710 // This implies that it has to be an operator or function. 5711 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5712 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5713 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5714 Diag(Loc, diag::err_introducing_special_friend) << 5715 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5716 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5717 return DeclPtrTy(); 5718 } 5719 } 5720 5721 bool Redeclaration = false; 5722 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5723 move(TemplateParams), 5724 IsDefinition, 5725 Redeclaration); 5726 if (!ND) return DeclPtrTy(); 5727 5728 assert(ND->getDeclContext() == DC); 5729 assert(ND->getLexicalDeclContext() == CurContext); 5730 5731 // Add the function declaration to the appropriate lookup tables, 5732 // adjusting the redeclarations list as necessary. We don't 5733 // want to do this yet if the friending class is dependent. 5734 // 5735 // Also update the scope-based lookup if the target context's 5736 // lookup context is in lexical scope. 5737 if (!CurContext->isDependentContext()) { 5738 DC = DC->getLookupContext(); 5739 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5740 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5741 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5742 } 5743 5744 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5745 D.getIdentifierLoc(), ND, 5746 DS.getFriendSpecLoc()); 5747 FrD->setAccess(AS_public); 5748 CurContext->addDecl(FrD); 5749 5750 return DeclPtrTy::make(ND); 5751} 5752 5753void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5754 AdjustDeclIfTemplate(dcl); 5755 5756 Decl *Dcl = dcl.getAs<Decl>(); 5757 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5758 if (!Fn) { 5759 Diag(DelLoc, diag::err_deleted_non_function); 5760 return; 5761 } 5762 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5763 Diag(DelLoc, diag::err_deleted_decl_not_first); 5764 Diag(Prev->getLocation(), diag::note_previous_declaration); 5765 // If the declaration wasn't the first, we delete the function anyway for 5766 // recovery. 5767 } 5768 Fn->setDeleted(); 5769} 5770 5771static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5772 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5773 ++CI) { 5774 Stmt *SubStmt = *CI; 5775 if (!SubStmt) 5776 continue; 5777 if (isa<ReturnStmt>(SubStmt)) 5778 Self.Diag(SubStmt->getSourceRange().getBegin(), 5779 diag::err_return_in_constructor_handler); 5780 if (!isa<Expr>(SubStmt)) 5781 SearchForReturnInStmt(Self, SubStmt); 5782 } 5783} 5784 5785void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5786 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5787 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5788 SearchForReturnInStmt(*this, Handler); 5789 } 5790} 5791 5792bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5793 const CXXMethodDecl *Old) { 5794 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5795 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5796 5797 if (Context.hasSameType(NewTy, OldTy) || 5798 NewTy->isDependentType() || OldTy->isDependentType()) 5799 return false; 5800 5801 // Check if the return types are covariant 5802 QualType NewClassTy, OldClassTy; 5803 5804 /// Both types must be pointers or references to classes. 5805 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5806 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5807 NewClassTy = NewPT->getPointeeType(); 5808 OldClassTy = OldPT->getPointeeType(); 5809 } 5810 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5811 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5812 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5813 NewClassTy = NewRT->getPointeeType(); 5814 OldClassTy = OldRT->getPointeeType(); 5815 } 5816 } 5817 } 5818 5819 // The return types aren't either both pointers or references to a class type. 5820 if (NewClassTy.isNull()) { 5821 Diag(New->getLocation(), 5822 diag::err_different_return_type_for_overriding_virtual_function) 5823 << New->getDeclName() << NewTy << OldTy; 5824 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5825 5826 return true; 5827 } 5828 5829 // C++ [class.virtual]p6: 5830 // If the return type of D::f differs from the return type of B::f, the 5831 // class type in the return type of D::f shall be complete at the point of 5832 // declaration of D::f or shall be the class type D. 5833 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5834 if (!RT->isBeingDefined() && 5835 RequireCompleteType(New->getLocation(), NewClassTy, 5836 PDiag(diag::err_covariant_return_incomplete) 5837 << New->getDeclName())) 5838 return true; 5839 } 5840 5841 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5842 // Check if the new class derives from the old class. 5843 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5844 Diag(New->getLocation(), 5845 diag::err_covariant_return_not_derived) 5846 << New->getDeclName() << NewTy << OldTy; 5847 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5848 return true; 5849 } 5850 5851 // Check if we the conversion from derived to base is valid. 5852 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5853 diag::err_covariant_return_inaccessible_base, 5854 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5855 // FIXME: Should this point to the return type? 5856 New->getLocation(), SourceRange(), New->getDeclName())) { 5857 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5858 return true; 5859 } 5860 } 5861 5862 // The qualifiers of the return types must be the same. 5863 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5864 Diag(New->getLocation(), 5865 diag::err_covariant_return_type_different_qualifications) 5866 << New->getDeclName() << NewTy << OldTy; 5867 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5868 return true; 5869 }; 5870 5871 5872 // The new class type must have the same or less qualifiers as the old type. 5873 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5874 Diag(New->getLocation(), 5875 diag::err_covariant_return_type_class_type_more_qualified) 5876 << New->getDeclName() << NewTy << OldTy; 5877 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5878 return true; 5879 }; 5880 5881 return false; 5882} 5883 5884bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5885 const CXXMethodDecl *Old) 5886{ 5887 if (Old->hasAttr<FinalAttr>()) { 5888 Diag(New->getLocation(), diag::err_final_function_overridden) 5889 << New->getDeclName(); 5890 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5891 return true; 5892 } 5893 5894 return false; 5895} 5896 5897/// \brief Mark the given method pure. 5898/// 5899/// \param Method the method to be marked pure. 5900/// 5901/// \param InitRange the source range that covers the "0" initializer. 5902bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5903 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5904 Method->setPure(); 5905 5906 // A class is abstract if at least one function is pure virtual. 5907 Method->getParent()->setAbstract(true); 5908 return false; 5909 } 5910 5911 if (!Method->isInvalidDecl()) 5912 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5913 << Method->getDeclName() << InitRange; 5914 return true; 5915} 5916 5917/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5918/// an initializer for the out-of-line declaration 'Dcl'. The scope 5919/// is a fresh scope pushed for just this purpose. 5920/// 5921/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5922/// static data member of class X, names should be looked up in the scope of 5923/// class X. 5924void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5925 // If there is no declaration, there was an error parsing it. 5926 Decl *D = Dcl.getAs<Decl>(); 5927 if (D == 0) return; 5928 5929 // We should only get called for declarations with scope specifiers, like: 5930 // int foo::bar; 5931 assert(D->isOutOfLine()); 5932 EnterDeclaratorContext(S, D->getDeclContext()); 5933} 5934 5935/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5936/// initializer for the out-of-line declaration 'Dcl'. 5937void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5938 // If there is no declaration, there was an error parsing it. 5939 Decl *D = Dcl.getAs<Decl>(); 5940 if (D == 0) return; 5941 5942 assert(D->isOutOfLine()); 5943 ExitDeclaratorContext(S); 5944} 5945 5946/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5947/// C++ if/switch/while/for statement. 5948/// e.g: "if (int x = f()) {...}" 5949Action::DeclResult 5950Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5951 // C++ 6.4p2: 5952 // The declarator shall not specify a function or an array. 5953 // The type-specifier-seq shall not contain typedef and shall not declare a 5954 // new class or enumeration. 5955 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5956 "Parser allowed 'typedef' as storage class of condition decl."); 5957 5958 TypeSourceInfo *TInfo = 0; 5959 TagDecl *OwnedTag = 0; 5960 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5961 5962 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5963 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5964 // would be created and CXXConditionDeclExpr wants a VarDecl. 5965 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5966 << D.getSourceRange(); 5967 return DeclResult(); 5968 } else if (OwnedTag && OwnedTag->isDefinition()) { 5969 // The type-specifier-seq shall not declare a new class or enumeration. 5970 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5971 } 5972 5973 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5974 if (!Dcl) 5975 return DeclResult(); 5976 5977 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5978 VD->setDeclaredInCondition(true); 5979 return Dcl; 5980} 5981 5982static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5983 // Ignore dependent types. 5984 if (MD->isDependentContext()) 5985 return false; 5986 5987 // Ignore declarations that are not definitions. 5988 if (!MD->isThisDeclarationADefinition()) 5989 return false; 5990 5991 CXXRecordDecl *RD = MD->getParent(); 5992 5993 // Ignore classes without a vtable. 5994 if (!RD->isDynamicClass()) 5995 return false; 5996 5997 switch (MD->getParent()->getTemplateSpecializationKind()) { 5998 case TSK_Undeclared: 5999 case TSK_ExplicitSpecialization: 6000 // Classes that aren't instantiations of templates don't need their 6001 // virtual methods marked until we see the definition of the key 6002 // function. 6003 break; 6004 6005 case TSK_ImplicitInstantiation: 6006 // This is a constructor of a class template; mark all of the virtual 6007 // members as referenced to ensure that they get instantiatied. 6008 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 6009 return true; 6010 break; 6011 6012 case TSK_ExplicitInstantiationDeclaration: 6013 return false; 6014 6015 case TSK_ExplicitInstantiationDefinition: 6016 // This is method of a explicit instantiation; mark all of the virtual 6017 // members as referenced to ensure that they get instantiatied. 6018 return true; 6019 } 6020 6021 // Consider only out-of-line definitions of member functions. When we see 6022 // an inline definition, it's too early to compute the key function. 6023 if (!MD->isOutOfLine()) 6024 return false; 6025 6026 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 6027 6028 // If there is no key function, we will need a copy of the vtable. 6029 if (!KeyFunction) 6030 return true; 6031 6032 // If this is the key function, we need to mark virtual members. 6033 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 6034 return true; 6035 6036 return false; 6037} 6038 6039void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 6040 CXXMethodDecl *MD) { 6041 CXXRecordDecl *RD = MD->getParent(); 6042 6043 // We will need to mark all of the virtual members as referenced to build the 6044 // vtable. 6045 if (!needsVtable(MD, Context)) 6046 return; 6047 6048 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 6049 if (kind == TSK_ImplicitInstantiation) 6050 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 6051 else 6052 MarkVirtualMembersReferenced(Loc, RD); 6053} 6054 6055bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 6056 if (ClassesWithUnmarkedVirtualMembers.empty()) 6057 return false; 6058 6059 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 6060 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 6061 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 6062 ClassesWithUnmarkedVirtualMembers.pop_back(); 6063 MarkVirtualMembersReferenced(Loc, RD); 6064 } 6065 6066 return true; 6067} 6068 6069void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6070 const CXXRecordDecl *RD) { 6071 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6072 e = RD->method_end(); i != e; ++i) { 6073 CXXMethodDecl *MD = *i; 6074 6075 // C++ [basic.def.odr]p2: 6076 // [...] A virtual member function is used if it is not pure. [...] 6077 if (MD->isVirtual() && !MD->isPure()) 6078 MarkDeclarationReferenced(Loc, MD); 6079 } 6080 6081 // Only classes that have virtual bases need a VTT. 6082 if (RD->getNumVBases() == 0) 6083 return; 6084 6085 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6086 e = RD->bases_end(); i != e; ++i) { 6087 const CXXRecordDecl *Base = 6088 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6089 if (i->isVirtual()) 6090 continue; 6091 if (Base->getNumVBases() == 0) 6092 continue; 6093 MarkVirtualMembersReferenced(Loc, Base); 6094 } 6095} 6096