SemaDeclCXX.cpp revision 114a297ef02a722b3afcd719210c060811d431e0
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, 0, CTC_NoKeywords) && 1103 R.isSingleResult()) { 1104 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1105 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1106 // We have found a non-static data member with a similar 1107 // name to what was typed; complain and initialize that 1108 // member. 1109 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1110 << MemberOrBase << true << R.getLookupName() 1111 << FixItHint::CreateReplacement(R.getNameLoc(), 1112 R.getLookupName().getAsString()); 1113 Diag(Member->getLocation(), diag::note_previous_decl) 1114 << Member->getDeclName(); 1115 1116 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1117 LParenLoc, RParenLoc); 1118 } 1119 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1120 const CXXBaseSpecifier *DirectBaseSpec; 1121 const CXXBaseSpecifier *VirtualBaseSpec; 1122 if (FindBaseInitializer(*this, ClassDecl, 1123 Context.getTypeDeclType(Type), 1124 DirectBaseSpec, VirtualBaseSpec)) { 1125 // We have found a direct or virtual base class with a 1126 // similar name to what was typed; complain and initialize 1127 // that base class. 1128 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1129 << MemberOrBase << false << R.getLookupName() 1130 << FixItHint::CreateReplacement(R.getNameLoc(), 1131 R.getLookupName().getAsString()); 1132 1133 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1134 : VirtualBaseSpec; 1135 Diag(BaseSpec->getSourceRange().getBegin(), 1136 diag::note_base_class_specified_here) 1137 << BaseSpec->getType() 1138 << BaseSpec->getSourceRange(); 1139 1140 TyD = Type; 1141 } 1142 } 1143 } 1144 1145 if (!TyD && BaseType.isNull()) { 1146 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1147 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1148 return true; 1149 } 1150 } 1151 1152 if (BaseType.isNull()) { 1153 BaseType = Context.getTypeDeclType(TyD); 1154 if (SS.isSet()) { 1155 NestedNameSpecifier *Qualifier = 1156 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1157 1158 // FIXME: preserve source range information 1159 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1160 } 1161 } 1162 } 1163 1164 if (!TInfo) 1165 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1166 1167 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1168 LParenLoc, RParenLoc, ClassDecl); 1169} 1170 1171/// Checks an initializer expression for use of uninitialized fields, such as 1172/// containing the field that is being initialized. Returns true if there is an 1173/// uninitialized field was used an updates the SourceLocation parameter; false 1174/// otherwise. 1175static bool InitExprContainsUninitializedFields(const Stmt* S, 1176 const FieldDecl* LhsField, 1177 SourceLocation* L) { 1178 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1179 if (ME) { 1180 const NamedDecl* RhsField = ME->getMemberDecl(); 1181 if (RhsField == LhsField) { 1182 // Initializing a field with itself. Throw a warning. 1183 // But wait; there are exceptions! 1184 // Exception #1: The field may not belong to this record. 1185 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1186 const Expr* base = ME->getBase(); 1187 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1188 // Even though the field matches, it does not belong to this record. 1189 return false; 1190 } 1191 // None of the exceptions triggered; return true to indicate an 1192 // uninitialized field was used. 1193 *L = ME->getMemberLoc(); 1194 return true; 1195 } 1196 } 1197 bool found = false; 1198 for (Stmt::const_child_iterator it = S->child_begin(); 1199 it != S->child_end() && found == false; 1200 ++it) { 1201 if (isa<CallExpr>(S)) { 1202 // Do not descend into function calls or constructors, as the use 1203 // of an uninitialized field may be valid. One would have to inspect 1204 // the contents of the function/ctor to determine if it is safe or not. 1205 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1206 // may be safe, depending on what the function/ctor does. 1207 continue; 1208 } 1209 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1210 } 1211 return found; 1212} 1213 1214Sema::MemInitResult 1215Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1216 unsigned NumArgs, SourceLocation IdLoc, 1217 SourceLocation LParenLoc, 1218 SourceLocation RParenLoc) { 1219 // Diagnose value-uses of fields to initialize themselves, e.g. 1220 // foo(foo) 1221 // where foo is not also a parameter to the constructor. 1222 // TODO: implement -Wuninitialized and fold this into that framework. 1223 for (unsigned i = 0; i < NumArgs; ++i) { 1224 SourceLocation L; 1225 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1226 // FIXME: Return true in the case when other fields are used before being 1227 // uninitialized. For example, let this field be the i'th field. When 1228 // initializing the i'th field, throw a warning if any of the >= i'th 1229 // fields are used, as they are not yet initialized. 1230 // Right now we are only handling the case where the i'th field uses 1231 // itself in its initializer. 1232 Diag(L, diag::warn_field_is_uninit); 1233 } 1234 } 1235 1236 bool HasDependentArg = false; 1237 for (unsigned i = 0; i < NumArgs; i++) 1238 HasDependentArg |= Args[i]->isTypeDependent(); 1239 1240 QualType FieldType = Member->getType(); 1241 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1242 FieldType = Array->getElementType(); 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, VirtualBaseSpec); 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 1434static bool 1435BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1436 CXXBaseSpecifier *BaseSpec, 1437 bool IsInheritedVirtualBase, 1438 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1439 InitializedEntity InitEntity 1440 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1441 IsInheritedVirtualBase); 1442 1443 InitializationKind InitKind 1444 = InitializationKind::CreateDefault(Constructor->getLocation()); 1445 1446 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1447 Sema::OwningExprResult BaseInit = 1448 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1449 Sema::MultiExprArg(SemaRef, 0, 0)); 1450 1451 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1452 if (BaseInit.isInvalid()) 1453 return true; 1454 1455 CXXBaseInit = 1456 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1457 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1458 SourceLocation()), 1459 BaseSpec->isVirtual(), 1460 SourceLocation(), 1461 BaseInit.takeAs<Expr>(), 1462 SourceLocation()); 1463 1464 return false; 1465} 1466 1467static bool 1468BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1469 FieldDecl *Field, 1470 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1471 QualType FieldBaseElementType = 1472 SemaRef.Context.getBaseElementType(Field->getType()); 1473 1474 if (FieldBaseElementType->isRecordType()) { 1475 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1476 InitializationKind InitKind 1477 = InitializationKind::CreateDefault(Constructor->getLocation()); 1478 1479 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1480 Sema::OwningExprResult MemberInit = 1481 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1482 Sema::MultiExprArg(SemaRef, 0, 0)); 1483 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1484 if (MemberInit.isInvalid()) 1485 return true; 1486 1487 CXXMemberInit = 1488 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1489 Field, SourceLocation(), 1490 SourceLocation(), 1491 MemberInit.takeAs<Expr>(), 1492 SourceLocation()); 1493 return false; 1494 } 1495 1496 if (FieldBaseElementType->isReferenceType()) { 1497 SemaRef.Diag(Constructor->getLocation(), 1498 diag::err_uninitialized_member_in_ctor) 1499 << (int)Constructor->isImplicit() 1500 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1501 << 0 << Field->getDeclName(); 1502 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1503 return true; 1504 } 1505 1506 if (FieldBaseElementType.isConstQualified()) { 1507 SemaRef.Diag(Constructor->getLocation(), 1508 diag::err_uninitialized_member_in_ctor) 1509 << (int)Constructor->isImplicit() 1510 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1511 << 1 << Field->getDeclName(); 1512 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1513 return true; 1514 } 1515 1516 // Nothing to initialize. 1517 CXXMemberInit = 0; 1518 return false; 1519} 1520 1521bool 1522Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1523 CXXBaseOrMemberInitializer **Initializers, 1524 unsigned NumInitializers, 1525 bool AnyErrors) { 1526 if (Constructor->getDeclContext()->isDependentContext()) { 1527 // Just store the initializers as written, they will be checked during 1528 // instantiation. 1529 if (NumInitializers > 0) { 1530 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1531 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1532 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1533 memcpy(baseOrMemberInitializers, Initializers, 1534 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1535 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1536 } 1537 1538 return false; 1539 } 1540 1541 // We need to build the initializer AST according to order of construction 1542 // and not what user specified in the Initializers list. 1543 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1544 if (!ClassDecl) 1545 return true; 1546 1547 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1548 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1549 bool HadError = false; 1550 1551 for (unsigned i = 0; i < NumInitializers; i++) { 1552 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1553 1554 if (Member->isBaseInitializer()) 1555 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1556 else 1557 AllBaseFields[Member->getMember()] = Member; 1558 } 1559 1560 // Keep track of the direct virtual bases. 1561 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1562 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1563 E = ClassDecl->bases_end(); I != E; ++I) { 1564 if (I->isVirtual()) 1565 DirectVBases.insert(I); 1566 } 1567 1568 // Push virtual bases before others. 1569 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1570 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1571 1572 if (CXXBaseOrMemberInitializer *Value 1573 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1574 AllToInit.push_back(Value); 1575 } else if (!AnyErrors) { 1576 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1577 CXXBaseOrMemberInitializer *CXXBaseInit; 1578 if (BuildImplicitBaseInitializer(*this, Constructor, VBase, 1579 IsInheritedVirtualBase, CXXBaseInit)) { 1580 HadError = true; 1581 continue; 1582 } 1583 1584 AllToInit.push_back(CXXBaseInit); 1585 } 1586 } 1587 1588 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1589 E = ClassDecl->bases_end(); Base != E; ++Base) { 1590 // Virtuals are in the virtual base list and already constructed. 1591 if (Base->isVirtual()) 1592 continue; 1593 1594 if (CXXBaseOrMemberInitializer *Value 1595 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1596 AllToInit.push_back(Value); 1597 } else if (!AnyErrors) { 1598 CXXBaseOrMemberInitializer *CXXBaseInit; 1599 if (BuildImplicitBaseInitializer(*this, Constructor, Base, 1600 /*IsInheritedVirtualBase=*/false, 1601 CXXBaseInit)) { 1602 HadError = true; 1603 continue; 1604 } 1605 1606 AllToInit.push_back(CXXBaseInit); 1607 } 1608 } 1609 1610 // non-static data members. 1611 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1612 E = ClassDecl->field_end(); Field != E; ++Field) { 1613 if ((*Field)->isAnonymousStructOrUnion()) { 1614 if (const RecordType *FieldClassType = 1615 Field->getType()->getAs<RecordType>()) { 1616 CXXRecordDecl *FieldClassDecl 1617 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1618 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1619 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1620 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1621 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1622 // set to the anonymous union data member used in the initializer 1623 // list. 1624 Value->setMember(*Field); 1625 Value->setAnonUnionMember(*FA); 1626 AllToInit.push_back(Value); 1627 break; 1628 } 1629 } 1630 } 1631 continue; 1632 } 1633 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1634 AllToInit.push_back(Value); 1635 continue; 1636 } 1637 1638 if (AnyErrors) 1639 continue; 1640 1641 CXXBaseOrMemberInitializer *Member; 1642 if (BuildImplicitMemberInitializer(*this, Constructor, *Field, Member)) { 1643 HadError = true; 1644 continue; 1645 } 1646 1647 // If the member doesn't need to be initialized, it will be null. 1648 if (Member) 1649 AllToInit.push_back(Member); 1650 } 1651 1652 NumInitializers = AllToInit.size(); 1653 if (NumInitializers > 0) { 1654 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1655 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1656 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1657 memcpy(baseOrMemberInitializers, AllToInit.data(), 1658 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1659 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1660 1661 // Constructors implicitly reference the base and member 1662 // destructors. 1663 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1664 Constructor->getParent()); 1665 } 1666 1667 return HadError; 1668} 1669 1670static void *GetKeyForTopLevelField(FieldDecl *Field) { 1671 // For anonymous unions, use the class declaration as the key. 1672 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1673 if (RT->getDecl()->isAnonymousStructOrUnion()) 1674 return static_cast<void *>(RT->getDecl()); 1675 } 1676 return static_cast<void *>(Field); 1677} 1678 1679static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1680 return Context.getCanonicalType(BaseType).getTypePtr(); 1681} 1682 1683static void *GetKeyForMember(ASTContext &Context, 1684 CXXBaseOrMemberInitializer *Member, 1685 bool MemberMaybeAnon = false) { 1686 if (!Member->isMemberInitializer()) 1687 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1688 1689 // For fields injected into the class via declaration of an anonymous union, 1690 // use its anonymous union class declaration as the unique key. 1691 FieldDecl *Field = Member->getMember(); 1692 1693 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1694 // data member of the class. Data member used in the initializer list is 1695 // in AnonUnionMember field. 1696 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1697 Field = Member->getAnonUnionMember(); 1698 1699 // If the field is a member of an anonymous struct or union, our key 1700 // is the anonymous record decl that's a direct child of the class. 1701 RecordDecl *RD = Field->getParent(); 1702 if (RD->isAnonymousStructOrUnion()) { 1703 while (true) { 1704 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1705 if (Parent->isAnonymousStructOrUnion()) 1706 RD = Parent; 1707 else 1708 break; 1709 } 1710 1711 return static_cast<void *>(RD); 1712 } 1713 1714 return static_cast<void *>(Field); 1715} 1716 1717static void 1718DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1719 const CXXConstructorDecl *Constructor, 1720 CXXBaseOrMemberInitializer **Inits, 1721 unsigned NumInits) { 1722 if (Constructor->getDeclContext()->isDependentContext()) 1723 return; 1724 1725 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1726 == Diagnostic::Ignored) 1727 return; 1728 1729 // Build the list of bases and members in the order that they'll 1730 // actually be initialized. The explicit initializers should be in 1731 // this same order but may be missing things. 1732 llvm::SmallVector<const void*, 32> IdealInitKeys; 1733 1734 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1735 1736 // 1. Virtual bases. 1737 for (CXXRecordDecl::base_class_const_iterator VBase = 1738 ClassDecl->vbases_begin(), 1739 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1740 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1741 1742 // 2. Non-virtual bases. 1743 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1744 E = ClassDecl->bases_end(); Base != E; ++Base) { 1745 if (Base->isVirtual()) 1746 continue; 1747 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1748 } 1749 1750 // 3. Direct fields. 1751 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1752 E = ClassDecl->field_end(); Field != E; ++Field) 1753 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1754 1755 unsigned NumIdealInits = IdealInitKeys.size(); 1756 unsigned IdealIndex = 0; 1757 1758 CXXBaseOrMemberInitializer *PrevInit = 0; 1759 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1760 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1761 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1762 1763 // Scan forward to try to find this initializer in the idealized 1764 // initializers list. 1765 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1766 if (InitKey == IdealInitKeys[IdealIndex]) 1767 break; 1768 1769 // If we didn't find this initializer, it must be because we 1770 // scanned past it on a previous iteration. That can only 1771 // happen if we're out of order; emit a warning. 1772 if (IdealIndex == NumIdealInits) { 1773 assert(PrevInit && "initializer not found in initializer list"); 1774 1775 Sema::SemaDiagnosticBuilder D = 1776 SemaRef.Diag(PrevInit->getSourceLocation(), 1777 diag::warn_initializer_out_of_order); 1778 1779 if (PrevInit->isMemberInitializer()) 1780 D << 0 << PrevInit->getMember()->getDeclName(); 1781 else 1782 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1783 1784 if (Init->isMemberInitializer()) 1785 D << 0 << Init->getMember()->getDeclName(); 1786 else 1787 D << 1 << Init->getBaseClassInfo()->getType(); 1788 1789 // Move back to the initializer's location in the ideal list. 1790 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1791 if (InitKey == IdealInitKeys[IdealIndex]) 1792 break; 1793 1794 assert(IdealIndex != NumIdealInits && 1795 "initializer not found in initializer list"); 1796 } 1797 1798 PrevInit = Init; 1799 } 1800} 1801 1802namespace { 1803bool CheckRedundantInit(Sema &S, 1804 CXXBaseOrMemberInitializer *Init, 1805 CXXBaseOrMemberInitializer *&PrevInit) { 1806 if (!PrevInit) { 1807 PrevInit = Init; 1808 return false; 1809 } 1810 1811 if (FieldDecl *Field = Init->getMember()) 1812 S.Diag(Init->getSourceLocation(), 1813 diag::err_multiple_mem_initialization) 1814 << Field->getDeclName() 1815 << Init->getSourceRange(); 1816 else { 1817 Type *BaseClass = Init->getBaseClass(); 1818 assert(BaseClass && "neither field nor base"); 1819 S.Diag(Init->getSourceLocation(), 1820 diag::err_multiple_base_initialization) 1821 << QualType(BaseClass, 0) 1822 << Init->getSourceRange(); 1823 } 1824 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1825 << 0 << PrevInit->getSourceRange(); 1826 1827 return true; 1828} 1829 1830typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1831typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1832 1833bool CheckRedundantUnionInit(Sema &S, 1834 CXXBaseOrMemberInitializer *Init, 1835 RedundantUnionMap &Unions) { 1836 FieldDecl *Field = Init->getMember(); 1837 RecordDecl *Parent = Field->getParent(); 1838 if (!Parent->isAnonymousStructOrUnion()) 1839 return false; 1840 1841 NamedDecl *Child = Field; 1842 do { 1843 if (Parent->isUnion()) { 1844 UnionEntry &En = Unions[Parent]; 1845 if (En.first && En.first != Child) { 1846 S.Diag(Init->getSourceLocation(), 1847 diag::err_multiple_mem_union_initialization) 1848 << Field->getDeclName() 1849 << Init->getSourceRange(); 1850 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1851 << 0 << En.second->getSourceRange(); 1852 return true; 1853 } else if (!En.first) { 1854 En.first = Child; 1855 En.second = Init; 1856 } 1857 } 1858 1859 Child = Parent; 1860 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1861 } while (Parent->isAnonymousStructOrUnion()); 1862 1863 return false; 1864} 1865} 1866 1867/// ActOnMemInitializers - Handle the member initializers for a constructor. 1868void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1869 SourceLocation ColonLoc, 1870 MemInitTy **meminits, unsigned NumMemInits, 1871 bool AnyErrors) { 1872 if (!ConstructorDecl) 1873 return; 1874 1875 AdjustDeclIfTemplate(ConstructorDecl); 1876 1877 CXXConstructorDecl *Constructor 1878 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1879 1880 if (!Constructor) { 1881 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1882 return; 1883 } 1884 1885 CXXBaseOrMemberInitializer **MemInits = 1886 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1887 1888 // Mapping for the duplicate initializers check. 1889 // For member initializers, this is keyed with a FieldDecl*. 1890 // For base initializers, this is keyed with a Type*. 1891 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1892 1893 // Mapping for the inconsistent anonymous-union initializers check. 1894 RedundantUnionMap MemberUnions; 1895 1896 bool HadError = false; 1897 for (unsigned i = 0; i < NumMemInits; i++) { 1898 CXXBaseOrMemberInitializer *Init = MemInits[i]; 1899 1900 if (Init->isMemberInitializer()) { 1901 FieldDecl *Field = Init->getMember(); 1902 if (CheckRedundantInit(*this, Init, Members[Field]) || 1903 CheckRedundantUnionInit(*this, Init, MemberUnions)) 1904 HadError = true; 1905 } else { 1906 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 1907 if (CheckRedundantInit(*this, Init, Members[Key])) 1908 HadError = true; 1909 } 1910 } 1911 1912 if (HadError) 1913 return; 1914 1915 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1916 1917 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1918} 1919 1920void 1921Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1922 CXXRecordDecl *ClassDecl) { 1923 // Ignore dependent contexts. 1924 if (ClassDecl->isDependentContext()) 1925 return; 1926 1927 // FIXME: all the access-control diagnostics are positioned on the 1928 // field/base declaration. That's probably good; that said, the 1929 // user might reasonably want to know why the destructor is being 1930 // emitted, and we currently don't say. 1931 1932 // Non-static data members. 1933 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1934 E = ClassDecl->field_end(); I != E; ++I) { 1935 FieldDecl *Field = *I; 1936 1937 QualType FieldType = Context.getBaseElementType(Field->getType()); 1938 1939 const RecordType* RT = FieldType->getAs<RecordType>(); 1940 if (!RT) 1941 continue; 1942 1943 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1944 if (FieldClassDecl->hasTrivialDestructor()) 1945 continue; 1946 1947 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1948 CheckDestructorAccess(Field->getLocation(), Dtor, 1949 PDiag(diag::err_access_dtor_field) 1950 << Field->getDeclName() 1951 << FieldType); 1952 1953 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1954 } 1955 1956 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1957 1958 // Bases. 1959 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1960 E = ClassDecl->bases_end(); Base != E; ++Base) { 1961 // Bases are always records in a well-formed non-dependent class. 1962 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1963 1964 // Remember direct virtual bases. 1965 if (Base->isVirtual()) 1966 DirectVirtualBases.insert(RT); 1967 1968 // Ignore trivial destructors. 1969 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1970 if (BaseClassDecl->hasTrivialDestructor()) 1971 continue; 1972 1973 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1974 1975 // FIXME: caret should be on the start of the class name 1976 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1977 PDiag(diag::err_access_dtor_base) 1978 << Base->getType() 1979 << Base->getSourceRange()); 1980 1981 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1982 } 1983 1984 // Virtual bases. 1985 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1986 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1987 1988 // Bases are always records in a well-formed non-dependent class. 1989 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1990 1991 // Ignore direct virtual bases. 1992 if (DirectVirtualBases.count(RT)) 1993 continue; 1994 1995 // Ignore trivial destructors. 1996 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1997 if (BaseClassDecl->hasTrivialDestructor()) 1998 continue; 1999 2000 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2001 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2002 PDiag(diag::err_access_dtor_vbase) 2003 << VBase->getType()); 2004 2005 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2006 } 2007} 2008 2009void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2010 if (!CDtorDecl) 2011 return; 2012 2013 if (CXXConstructorDecl *Constructor 2014 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2015 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2016} 2017 2018bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2019 unsigned DiagID, AbstractDiagSelID SelID, 2020 const CXXRecordDecl *CurrentRD) { 2021 if (SelID == -1) 2022 return RequireNonAbstractType(Loc, T, 2023 PDiag(DiagID), CurrentRD); 2024 else 2025 return RequireNonAbstractType(Loc, T, 2026 PDiag(DiagID) << SelID, CurrentRD); 2027} 2028 2029bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2030 const PartialDiagnostic &PD, 2031 const CXXRecordDecl *CurrentRD) { 2032 if (!getLangOptions().CPlusPlus) 2033 return false; 2034 2035 if (const ArrayType *AT = Context.getAsArrayType(T)) 2036 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2037 CurrentRD); 2038 2039 if (const PointerType *PT = T->getAs<PointerType>()) { 2040 // Find the innermost pointer type. 2041 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2042 PT = T; 2043 2044 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2045 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2046 } 2047 2048 const RecordType *RT = T->getAs<RecordType>(); 2049 if (!RT) 2050 return false; 2051 2052 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2053 2054 if (CurrentRD && CurrentRD != RD) 2055 return false; 2056 2057 // FIXME: is this reasonable? It matches current behavior, but.... 2058 if (!RD->getDefinition()) 2059 return false; 2060 2061 if (!RD->isAbstract()) 2062 return false; 2063 2064 Diag(Loc, PD) << RD->getDeclName(); 2065 2066 // Check if we've already emitted the list of pure virtual functions for this 2067 // class. 2068 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2069 return true; 2070 2071 CXXFinalOverriderMap FinalOverriders; 2072 RD->getFinalOverriders(FinalOverriders); 2073 2074 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2075 MEnd = FinalOverriders.end(); 2076 M != MEnd; 2077 ++M) { 2078 for (OverridingMethods::iterator SO = M->second.begin(), 2079 SOEnd = M->second.end(); 2080 SO != SOEnd; ++SO) { 2081 // C++ [class.abstract]p4: 2082 // A class is abstract if it contains or inherits at least one 2083 // pure virtual function for which the final overrider is pure 2084 // virtual. 2085 2086 // 2087 if (SO->second.size() != 1) 2088 continue; 2089 2090 if (!SO->second.front().Method->isPure()) 2091 continue; 2092 2093 Diag(SO->second.front().Method->getLocation(), 2094 diag::note_pure_virtual_function) 2095 << SO->second.front().Method->getDeclName(); 2096 } 2097 } 2098 2099 if (!PureVirtualClassDiagSet) 2100 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2101 PureVirtualClassDiagSet->insert(RD); 2102 2103 return true; 2104} 2105 2106namespace { 2107 class AbstractClassUsageDiagnoser 2108 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2109 Sema &SemaRef; 2110 CXXRecordDecl *AbstractClass; 2111 2112 bool VisitDeclContext(const DeclContext *DC) { 2113 bool Invalid = false; 2114 2115 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2116 E = DC->decls_end(); I != E; ++I) 2117 Invalid |= Visit(*I); 2118 2119 return Invalid; 2120 } 2121 2122 public: 2123 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2124 : SemaRef(SemaRef), AbstractClass(ac) { 2125 Visit(SemaRef.Context.getTranslationUnitDecl()); 2126 } 2127 2128 bool VisitFunctionDecl(const FunctionDecl *FD) { 2129 if (FD->isThisDeclarationADefinition()) { 2130 // No need to do the check if we're in a definition, because it requires 2131 // that the return/param types are complete. 2132 // because that requires 2133 return VisitDeclContext(FD); 2134 } 2135 2136 // Check the return type. 2137 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2138 bool Invalid = 2139 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2140 diag::err_abstract_type_in_decl, 2141 Sema::AbstractReturnType, 2142 AbstractClass); 2143 2144 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2145 E = FD->param_end(); I != E; ++I) { 2146 const ParmVarDecl *VD = *I; 2147 Invalid |= 2148 SemaRef.RequireNonAbstractType(VD->getLocation(), 2149 VD->getOriginalType(), 2150 diag::err_abstract_type_in_decl, 2151 Sema::AbstractParamType, 2152 AbstractClass); 2153 } 2154 2155 return Invalid; 2156 } 2157 2158 bool VisitDecl(const Decl* D) { 2159 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2160 return VisitDeclContext(DC); 2161 2162 return false; 2163 } 2164 }; 2165} 2166 2167/// \brief Perform semantic checks on a class definition that has been 2168/// completing, introducing implicitly-declared members, checking for 2169/// abstract types, etc. 2170void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2171 if (!Record || Record->isInvalidDecl()) 2172 return; 2173 2174 if (!Record->isDependentType()) 2175 AddImplicitlyDeclaredMembersToClass(S, Record); 2176 2177 if (Record->isInvalidDecl()) 2178 return; 2179 2180 // Set access bits correctly on the directly-declared conversions. 2181 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2182 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2183 Convs->setAccess(I, (*I)->getAccess()); 2184 2185 // Determine whether we need to check for final overriders. We do 2186 // this either when there are virtual base classes (in which case we 2187 // may end up finding multiple final overriders for a given virtual 2188 // function) or any of the base classes is abstract (in which case 2189 // we might detect that this class is abstract). 2190 bool CheckFinalOverriders = false; 2191 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2192 !Record->isDependentType()) { 2193 if (Record->getNumVBases()) 2194 CheckFinalOverriders = true; 2195 else if (!Record->isAbstract()) { 2196 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2197 BEnd = Record->bases_end(); 2198 B != BEnd; ++B) { 2199 CXXRecordDecl *BaseDecl 2200 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2201 if (BaseDecl->isAbstract()) { 2202 CheckFinalOverriders = true; 2203 break; 2204 } 2205 } 2206 } 2207 } 2208 2209 if (CheckFinalOverriders) { 2210 CXXFinalOverriderMap FinalOverriders; 2211 Record->getFinalOverriders(FinalOverriders); 2212 2213 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2214 MEnd = FinalOverriders.end(); 2215 M != MEnd; ++M) { 2216 for (OverridingMethods::iterator SO = M->second.begin(), 2217 SOEnd = M->second.end(); 2218 SO != SOEnd; ++SO) { 2219 assert(SO->second.size() > 0 && 2220 "All virtual functions have overridding virtual functions"); 2221 if (SO->second.size() == 1) { 2222 // C++ [class.abstract]p4: 2223 // A class is abstract if it contains or inherits at least one 2224 // pure virtual function for which the final overrider is pure 2225 // virtual. 2226 if (SO->second.front().Method->isPure()) 2227 Record->setAbstract(true); 2228 continue; 2229 } 2230 2231 // C++ [class.virtual]p2: 2232 // In a derived class, if a virtual member function of a base 2233 // class subobject has more than one final overrider the 2234 // program is ill-formed. 2235 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2236 << (NamedDecl *)M->first << Record; 2237 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2238 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2239 OMEnd = SO->second.end(); 2240 OM != OMEnd; ++OM) 2241 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2242 << (NamedDecl *)M->first << OM->Method->getParent(); 2243 2244 Record->setInvalidDecl(); 2245 } 2246 } 2247 } 2248 2249 if (Record->isAbstract() && !Record->isInvalidDecl()) 2250 (void)AbstractClassUsageDiagnoser(*this, Record); 2251 2252 // If this is not an aggregate type and has no user-declared constructor, 2253 // complain about any non-static data members of reference or const scalar 2254 // type, since they will never get initializers. 2255 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2256 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2257 bool Complained = false; 2258 for (RecordDecl::field_iterator F = Record->field_begin(), 2259 FEnd = Record->field_end(); 2260 F != FEnd; ++F) { 2261 if (F->getType()->isReferenceType() || 2262 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2263 if (!Complained) { 2264 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2265 << Record->getTagKind() << Record; 2266 Complained = true; 2267 } 2268 2269 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2270 << F->getType()->isReferenceType() 2271 << F->getDeclName(); 2272 } 2273 } 2274 } 2275} 2276 2277void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2278 DeclPtrTy TagDecl, 2279 SourceLocation LBrac, 2280 SourceLocation RBrac, 2281 AttributeList *AttrList) { 2282 if (!TagDecl) 2283 return; 2284 2285 AdjustDeclIfTemplate(TagDecl); 2286 2287 ActOnFields(S, RLoc, TagDecl, 2288 (DeclPtrTy*)FieldCollector->getCurFields(), 2289 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2290 2291 CheckCompletedCXXClass(S, 2292 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2293} 2294 2295/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2296/// special functions, such as the default constructor, copy 2297/// constructor, or destructor, to the given C++ class (C++ 2298/// [special]p1). This routine can only be executed just before the 2299/// definition of the class is complete. 2300/// 2301/// The scope, if provided, is the class scope. 2302void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2303 CXXRecordDecl *ClassDecl) { 2304 CanQualType ClassType 2305 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2306 2307 // FIXME: Implicit declarations have exception specifications, which are 2308 // the union of the specifications of the implicitly called functions. 2309 2310 if (!ClassDecl->hasUserDeclaredConstructor()) { 2311 // C++ [class.ctor]p5: 2312 // A default constructor for a class X is a constructor of class X 2313 // that can be called without an argument. If there is no 2314 // user-declared constructor for class X, a default constructor is 2315 // implicitly declared. An implicitly-declared default constructor 2316 // is an inline public member of its class. 2317 DeclarationName Name 2318 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2319 CXXConstructorDecl *DefaultCon = 2320 CXXConstructorDecl::Create(Context, ClassDecl, 2321 ClassDecl->getLocation(), Name, 2322 Context.getFunctionType(Context.VoidTy, 2323 0, 0, false, 0, 2324 /*FIXME*/false, false, 2325 0, 0, 2326 FunctionType::ExtInfo()), 2327 /*TInfo=*/0, 2328 /*isExplicit=*/false, 2329 /*isInline=*/true, 2330 /*isImplicitlyDeclared=*/true); 2331 DefaultCon->setAccess(AS_public); 2332 DefaultCon->setImplicit(); 2333 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2334 if (S) 2335 PushOnScopeChains(DefaultCon, S, true); 2336 else 2337 ClassDecl->addDecl(DefaultCon); 2338 } 2339 2340 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2341 // C++ [class.copy]p4: 2342 // If the class definition does not explicitly declare a copy 2343 // constructor, one is declared implicitly. 2344 2345 // C++ [class.copy]p5: 2346 // The implicitly-declared copy constructor for a class X will 2347 // have the form 2348 // 2349 // X::X(const X&) 2350 // 2351 // if 2352 bool HasConstCopyConstructor = true; 2353 2354 // -- each direct or virtual base class B of X has a copy 2355 // constructor whose first parameter is of type const B& or 2356 // const volatile B&, and 2357 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2358 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2359 const CXXRecordDecl *BaseClassDecl 2360 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2361 HasConstCopyConstructor 2362 = BaseClassDecl->hasConstCopyConstructor(Context); 2363 } 2364 2365 // -- for all the nonstatic data members of X that are of a 2366 // class type M (or array thereof), each such class type 2367 // has a copy constructor whose first parameter is of type 2368 // const M& or const volatile M&. 2369 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2370 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2371 ++Field) { 2372 QualType FieldType = (*Field)->getType(); 2373 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2374 FieldType = Array->getElementType(); 2375 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2376 const CXXRecordDecl *FieldClassDecl 2377 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2378 HasConstCopyConstructor 2379 = FieldClassDecl->hasConstCopyConstructor(Context); 2380 } 2381 } 2382 2383 // Otherwise, the implicitly declared copy constructor will have 2384 // the form 2385 // 2386 // X::X(X&) 2387 QualType ArgType = ClassType; 2388 if (HasConstCopyConstructor) 2389 ArgType = ArgType.withConst(); 2390 ArgType = Context.getLValueReferenceType(ArgType); 2391 2392 // An implicitly-declared copy constructor is an inline public 2393 // member of its class. 2394 DeclarationName Name 2395 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2396 CXXConstructorDecl *CopyConstructor 2397 = CXXConstructorDecl::Create(Context, ClassDecl, 2398 ClassDecl->getLocation(), Name, 2399 Context.getFunctionType(Context.VoidTy, 2400 &ArgType, 1, 2401 false, 0, 2402 /*FIXME:*/false, 2403 false, 0, 0, 2404 FunctionType::ExtInfo()), 2405 /*TInfo=*/0, 2406 /*isExplicit=*/false, 2407 /*isInline=*/true, 2408 /*isImplicitlyDeclared=*/true); 2409 CopyConstructor->setAccess(AS_public); 2410 CopyConstructor->setImplicit(); 2411 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2412 2413 // Add the parameter to the constructor. 2414 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2415 ClassDecl->getLocation(), 2416 /*IdentifierInfo=*/0, 2417 ArgType, /*TInfo=*/0, 2418 VarDecl::None, 2419 VarDecl::None, 0); 2420 CopyConstructor->setParams(&FromParam, 1); 2421 if (S) 2422 PushOnScopeChains(CopyConstructor, S, true); 2423 else 2424 ClassDecl->addDecl(CopyConstructor); 2425 } 2426 2427 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2428 // Note: The following rules are largely analoguous to the copy 2429 // constructor rules. Note that virtual bases are not taken into account 2430 // for determining the argument type of the operator. Note also that 2431 // operators taking an object instead of a reference are allowed. 2432 // 2433 // C++ [class.copy]p10: 2434 // If the class definition does not explicitly declare a copy 2435 // assignment operator, one is declared implicitly. 2436 // The implicitly-defined copy assignment operator for a class X 2437 // will have the form 2438 // 2439 // X& X::operator=(const X&) 2440 // 2441 // if 2442 bool HasConstCopyAssignment = true; 2443 2444 // -- each direct base class B of X has a copy assignment operator 2445 // whose parameter is of type const B&, const volatile B& or B, 2446 // and 2447 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2448 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2449 assert(!Base->getType()->isDependentType() && 2450 "Cannot generate implicit members for class with dependent bases."); 2451 const CXXRecordDecl *BaseClassDecl 2452 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2453 const CXXMethodDecl *MD = 0; 2454 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2455 MD); 2456 } 2457 2458 // -- for all the nonstatic data members of X that are of a class 2459 // type M (or array thereof), each such class type has a copy 2460 // assignment operator whose parameter is of type const M&, 2461 // const volatile M& or M. 2462 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2463 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2464 ++Field) { 2465 QualType FieldType = (*Field)->getType(); 2466 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2467 FieldType = Array->getElementType(); 2468 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2469 const CXXRecordDecl *FieldClassDecl 2470 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2471 const CXXMethodDecl *MD = 0; 2472 HasConstCopyAssignment 2473 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2474 } 2475 } 2476 2477 // Otherwise, the implicitly declared copy assignment operator will 2478 // have the form 2479 // 2480 // X& X::operator=(X&) 2481 QualType ArgType = ClassType; 2482 QualType RetType = Context.getLValueReferenceType(ArgType); 2483 if (HasConstCopyAssignment) 2484 ArgType = ArgType.withConst(); 2485 ArgType = Context.getLValueReferenceType(ArgType); 2486 2487 // An implicitly-declared copy assignment operator is an inline public 2488 // member of its class. 2489 DeclarationName Name = 2490 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2491 CXXMethodDecl *CopyAssignment = 2492 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2493 Context.getFunctionType(RetType, &ArgType, 1, 2494 false, 0, 2495 /*FIXME:*/false, 2496 false, 0, 0, 2497 FunctionType::ExtInfo()), 2498 /*TInfo=*/0, /*isStatic=*/false, 2499 /*StorageClassAsWritten=*/FunctionDecl::None, 2500 /*isInline=*/true); 2501 CopyAssignment->setAccess(AS_public); 2502 CopyAssignment->setImplicit(); 2503 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2504 CopyAssignment->setCopyAssignment(true); 2505 2506 // Add the parameter to the operator. 2507 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2508 ClassDecl->getLocation(), 2509 /*IdentifierInfo=*/0, 2510 ArgType, /*TInfo=*/0, 2511 VarDecl::None, 2512 VarDecl::None, 0); 2513 CopyAssignment->setParams(&FromParam, 1); 2514 2515 // Don't call addedAssignmentOperator. There is no way to distinguish an 2516 // implicit from an explicit assignment operator. 2517 if (S) 2518 PushOnScopeChains(CopyAssignment, S, true); 2519 else 2520 ClassDecl->addDecl(CopyAssignment); 2521 AddOverriddenMethods(ClassDecl, CopyAssignment); 2522 } 2523 2524 if (!ClassDecl->hasUserDeclaredDestructor()) { 2525 // C++ [class.dtor]p2: 2526 // If a class has no user-declared destructor, a destructor is 2527 // declared implicitly. An implicitly-declared destructor is an 2528 // inline public member of its class. 2529 QualType Ty = Context.getFunctionType(Context.VoidTy, 2530 0, 0, false, 0, 2531 /*FIXME:*/false, 2532 false, 0, 0, FunctionType::ExtInfo()); 2533 2534 DeclarationName Name 2535 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2536 CXXDestructorDecl *Destructor 2537 = CXXDestructorDecl::Create(Context, ClassDecl, 2538 ClassDecl->getLocation(), Name, Ty, 2539 /*isInline=*/true, 2540 /*isImplicitlyDeclared=*/true); 2541 Destructor->setAccess(AS_public); 2542 Destructor->setImplicit(); 2543 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2544 if (S) 2545 PushOnScopeChains(Destructor, S, true); 2546 else 2547 ClassDecl->addDecl(Destructor); 2548 2549 // This could be uniqued if it ever proves significant. 2550 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2551 2552 AddOverriddenMethods(ClassDecl, Destructor); 2553 } 2554} 2555 2556void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2557 Decl *D = TemplateD.getAs<Decl>(); 2558 if (!D) 2559 return; 2560 2561 TemplateParameterList *Params = 0; 2562 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2563 Params = Template->getTemplateParameters(); 2564 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2565 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2566 Params = PartialSpec->getTemplateParameters(); 2567 else 2568 return; 2569 2570 for (TemplateParameterList::iterator Param = Params->begin(), 2571 ParamEnd = Params->end(); 2572 Param != ParamEnd; ++Param) { 2573 NamedDecl *Named = cast<NamedDecl>(*Param); 2574 if (Named->getDeclName()) { 2575 S->AddDecl(DeclPtrTy::make(Named)); 2576 IdResolver.AddDecl(Named); 2577 } 2578 } 2579} 2580 2581void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2582 if (!RecordD) return; 2583 AdjustDeclIfTemplate(RecordD); 2584 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2585 PushDeclContext(S, Record); 2586} 2587 2588void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2589 if (!RecordD) return; 2590 PopDeclContext(); 2591} 2592 2593/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2594/// parsing a top-level (non-nested) C++ class, and we are now 2595/// parsing those parts of the given Method declaration that could 2596/// not be parsed earlier (C++ [class.mem]p2), such as default 2597/// arguments. This action should enter the scope of the given 2598/// Method declaration as if we had just parsed the qualified method 2599/// name. However, it should not bring the parameters into scope; 2600/// that will be performed by ActOnDelayedCXXMethodParameter. 2601void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2602} 2603 2604/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2605/// C++ method declaration. We're (re-)introducing the given 2606/// function parameter into scope for use in parsing later parts of 2607/// the method declaration. For example, we could see an 2608/// ActOnParamDefaultArgument event for this parameter. 2609void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2610 if (!ParamD) 2611 return; 2612 2613 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2614 2615 // If this parameter has an unparsed default argument, clear it out 2616 // to make way for the parsed default argument. 2617 if (Param->hasUnparsedDefaultArg()) 2618 Param->setDefaultArg(0); 2619 2620 S->AddDecl(DeclPtrTy::make(Param)); 2621 if (Param->getDeclName()) 2622 IdResolver.AddDecl(Param); 2623} 2624 2625/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2626/// processing the delayed method declaration for Method. The method 2627/// declaration is now considered finished. There may be a separate 2628/// ActOnStartOfFunctionDef action later (not necessarily 2629/// immediately!) for this method, if it was also defined inside the 2630/// class body. 2631void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2632 if (!MethodD) 2633 return; 2634 2635 AdjustDeclIfTemplate(MethodD); 2636 2637 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2638 2639 // Now that we have our default arguments, check the constructor 2640 // again. It could produce additional diagnostics or affect whether 2641 // the class has implicitly-declared destructors, among other 2642 // things. 2643 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2644 CheckConstructor(Constructor); 2645 2646 // Check the default arguments, which we may have added. 2647 if (!Method->isInvalidDecl()) 2648 CheckCXXDefaultArguments(Method); 2649} 2650 2651/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2652/// the well-formedness of the constructor declarator @p D with type @p 2653/// R. If there are any errors in the declarator, this routine will 2654/// emit diagnostics and set the invalid bit to true. In any case, the type 2655/// will be updated to reflect a well-formed type for the constructor and 2656/// returned. 2657QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2658 FunctionDecl::StorageClass &SC) { 2659 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2660 2661 // C++ [class.ctor]p3: 2662 // A constructor shall not be virtual (10.3) or static (9.4). A 2663 // constructor can be invoked for a const, volatile or const 2664 // volatile object. A constructor shall not be declared const, 2665 // volatile, or const volatile (9.3.2). 2666 if (isVirtual) { 2667 if (!D.isInvalidType()) 2668 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2669 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2670 << SourceRange(D.getIdentifierLoc()); 2671 D.setInvalidType(); 2672 } 2673 if (SC == FunctionDecl::Static) { 2674 if (!D.isInvalidType()) 2675 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2676 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2677 << SourceRange(D.getIdentifierLoc()); 2678 D.setInvalidType(); 2679 SC = FunctionDecl::None; 2680 } 2681 2682 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2683 if (FTI.TypeQuals != 0) { 2684 if (FTI.TypeQuals & Qualifiers::Const) 2685 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2686 << "const" << SourceRange(D.getIdentifierLoc()); 2687 if (FTI.TypeQuals & Qualifiers::Volatile) 2688 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2689 << "volatile" << SourceRange(D.getIdentifierLoc()); 2690 if (FTI.TypeQuals & Qualifiers::Restrict) 2691 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2692 << "restrict" << SourceRange(D.getIdentifierLoc()); 2693 } 2694 2695 // Rebuild the function type "R" without any type qualifiers (in 2696 // case any of the errors above fired) and with "void" as the 2697 // return type, since constructors don't have return types. We 2698 // *always* have to do this, because GetTypeForDeclarator will 2699 // put in a result type of "int" when none was specified. 2700 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2701 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2702 Proto->getNumArgs(), 2703 Proto->isVariadic(), 0, 2704 Proto->hasExceptionSpec(), 2705 Proto->hasAnyExceptionSpec(), 2706 Proto->getNumExceptions(), 2707 Proto->exception_begin(), 2708 Proto->getExtInfo()); 2709} 2710 2711/// CheckConstructor - Checks a fully-formed constructor for 2712/// well-formedness, issuing any diagnostics required. Returns true if 2713/// the constructor declarator is invalid. 2714void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2715 CXXRecordDecl *ClassDecl 2716 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2717 if (!ClassDecl) 2718 return Constructor->setInvalidDecl(); 2719 2720 // C++ [class.copy]p3: 2721 // A declaration of a constructor for a class X is ill-formed if 2722 // its first parameter is of type (optionally cv-qualified) X and 2723 // either there are no other parameters or else all other 2724 // parameters have default arguments. 2725 if (!Constructor->isInvalidDecl() && 2726 ((Constructor->getNumParams() == 1) || 2727 (Constructor->getNumParams() > 1 && 2728 Constructor->getParamDecl(1)->hasDefaultArg())) && 2729 Constructor->getTemplateSpecializationKind() 2730 != TSK_ImplicitInstantiation) { 2731 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2732 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2733 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2734 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2735 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2736 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2737 2738 // FIXME: Rather that making the constructor invalid, we should endeavor 2739 // to fix the type. 2740 Constructor->setInvalidDecl(); 2741 } 2742 } 2743 2744 // Notify the class that we've added a constructor. In principle we 2745 // don't need to do this for out-of-line declarations; in practice 2746 // we only instantiate the most recent declaration of a method, so 2747 // we have to call this for everything but friends. 2748 if (!Constructor->getFriendObjectKind()) 2749 ClassDecl->addedConstructor(Context, Constructor); 2750} 2751 2752/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2753/// issuing any diagnostics required. Returns true on error. 2754bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2755 CXXRecordDecl *RD = Destructor->getParent(); 2756 2757 if (Destructor->isVirtual()) { 2758 SourceLocation Loc; 2759 2760 if (!Destructor->isImplicit()) 2761 Loc = Destructor->getLocation(); 2762 else 2763 Loc = RD->getLocation(); 2764 2765 // If we have a virtual destructor, look up the deallocation function 2766 FunctionDecl *OperatorDelete = 0; 2767 DeclarationName Name = 2768 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2769 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2770 return true; 2771 2772 Destructor->setOperatorDelete(OperatorDelete); 2773 } 2774 2775 return false; 2776} 2777 2778static inline bool 2779FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2780 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2781 FTI.ArgInfo[0].Param && 2782 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2783} 2784 2785/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2786/// the well-formednes of the destructor declarator @p D with type @p 2787/// R. If there are any errors in the declarator, this routine will 2788/// emit diagnostics and set the declarator to invalid. Even if this happens, 2789/// will be updated to reflect a well-formed type for the destructor and 2790/// returned. 2791QualType Sema::CheckDestructorDeclarator(Declarator &D, 2792 FunctionDecl::StorageClass& SC) { 2793 // C++ [class.dtor]p1: 2794 // [...] A typedef-name that names a class is a class-name 2795 // (7.1.3); however, a typedef-name that names a class shall not 2796 // be used as the identifier in the declarator for a destructor 2797 // declaration. 2798 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2799 if (isa<TypedefType>(DeclaratorType)) { 2800 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2801 << DeclaratorType; 2802 D.setInvalidType(); 2803 } 2804 2805 // C++ [class.dtor]p2: 2806 // A destructor is used to destroy objects of its class type. A 2807 // destructor takes no parameters, and no return type can be 2808 // specified for it (not even void). The address of a destructor 2809 // shall not be taken. A destructor shall not be static. A 2810 // destructor can be invoked for a const, volatile or const 2811 // volatile object. A destructor shall not be declared const, 2812 // volatile or const volatile (9.3.2). 2813 if (SC == FunctionDecl::Static) { 2814 if (!D.isInvalidType()) 2815 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2816 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2817 << SourceRange(D.getIdentifierLoc()); 2818 SC = FunctionDecl::None; 2819 D.setInvalidType(); 2820 } 2821 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2822 // Destructors don't have return types, but the parser will 2823 // happily parse something like: 2824 // 2825 // class X { 2826 // float ~X(); 2827 // }; 2828 // 2829 // The return type will be eliminated later. 2830 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2831 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2832 << SourceRange(D.getIdentifierLoc()); 2833 } 2834 2835 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2836 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2837 if (FTI.TypeQuals & Qualifiers::Const) 2838 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2839 << "const" << SourceRange(D.getIdentifierLoc()); 2840 if (FTI.TypeQuals & Qualifiers::Volatile) 2841 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2842 << "volatile" << SourceRange(D.getIdentifierLoc()); 2843 if (FTI.TypeQuals & Qualifiers::Restrict) 2844 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2845 << "restrict" << SourceRange(D.getIdentifierLoc()); 2846 D.setInvalidType(); 2847 } 2848 2849 // Make sure we don't have any parameters. 2850 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2851 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2852 2853 // Delete the parameters. 2854 FTI.freeArgs(); 2855 D.setInvalidType(); 2856 } 2857 2858 // Make sure the destructor isn't variadic. 2859 if (FTI.isVariadic) { 2860 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2861 D.setInvalidType(); 2862 } 2863 2864 // Rebuild the function type "R" without any type qualifiers or 2865 // parameters (in case any of the errors above fired) and with 2866 // "void" as the return type, since destructors don't have return 2867 // types. We *always* have to do this, because GetTypeForDeclarator 2868 // will put in a result type of "int" when none was specified. 2869 // FIXME: Exceptions! 2870 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2871 false, false, 0, 0, FunctionType::ExtInfo()); 2872} 2873 2874/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2875/// well-formednes of the conversion function declarator @p D with 2876/// type @p R. If there are any errors in the declarator, this routine 2877/// will emit diagnostics and return true. Otherwise, it will return 2878/// false. Either way, the type @p R will be updated to reflect a 2879/// well-formed type for the conversion operator. 2880void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2881 FunctionDecl::StorageClass& SC) { 2882 // C++ [class.conv.fct]p1: 2883 // Neither parameter types nor return type can be specified. The 2884 // type of a conversion function (8.3.5) is "function taking no 2885 // parameter returning conversion-type-id." 2886 if (SC == FunctionDecl::Static) { 2887 if (!D.isInvalidType()) 2888 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2889 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2890 << SourceRange(D.getIdentifierLoc()); 2891 D.setInvalidType(); 2892 SC = FunctionDecl::None; 2893 } 2894 2895 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2896 2897 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2898 // Conversion functions don't have return types, but the parser will 2899 // happily parse something like: 2900 // 2901 // class X { 2902 // float operator bool(); 2903 // }; 2904 // 2905 // The return type will be changed later anyway. 2906 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2907 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2908 << SourceRange(D.getIdentifierLoc()); 2909 D.setInvalidType(); 2910 } 2911 2912 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2913 2914 // Make sure we don't have any parameters. 2915 if (Proto->getNumArgs() > 0) { 2916 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2917 2918 // Delete the parameters. 2919 D.getTypeObject(0).Fun.freeArgs(); 2920 D.setInvalidType(); 2921 } else if (Proto->isVariadic()) { 2922 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2923 D.setInvalidType(); 2924 } 2925 2926 // Diagnose "&operator bool()" and other such nonsense. This 2927 // is actually a gcc extension which we don't support. 2928 if (Proto->getResultType() != ConvType) { 2929 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 2930 << Proto->getResultType(); 2931 D.setInvalidType(); 2932 ConvType = Proto->getResultType(); 2933 } 2934 2935 // C++ [class.conv.fct]p4: 2936 // The conversion-type-id shall not represent a function type nor 2937 // an array type. 2938 if (ConvType->isArrayType()) { 2939 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2940 ConvType = Context.getPointerType(ConvType); 2941 D.setInvalidType(); 2942 } else if (ConvType->isFunctionType()) { 2943 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2944 ConvType = Context.getPointerType(ConvType); 2945 D.setInvalidType(); 2946 } 2947 2948 // Rebuild the function type "R" without any parameters (in case any 2949 // of the errors above fired) and with the conversion type as the 2950 // return type. 2951 if (D.isInvalidType()) { 2952 R = Context.getFunctionType(ConvType, 0, 0, false, 2953 Proto->getTypeQuals(), 2954 Proto->hasExceptionSpec(), 2955 Proto->hasAnyExceptionSpec(), 2956 Proto->getNumExceptions(), 2957 Proto->exception_begin(), 2958 Proto->getExtInfo()); 2959 } 2960 2961 // C++0x explicit conversion operators. 2962 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2963 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2964 diag::warn_explicit_conversion_functions) 2965 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2966} 2967 2968/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2969/// the declaration of the given C++ conversion function. This routine 2970/// is responsible for recording the conversion function in the C++ 2971/// class, if possible. 2972Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2973 assert(Conversion && "Expected to receive a conversion function declaration"); 2974 2975 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2976 2977 // Make sure we aren't redeclaring the conversion function. 2978 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2979 2980 // C++ [class.conv.fct]p1: 2981 // [...] A conversion function is never used to convert a 2982 // (possibly cv-qualified) object to the (possibly cv-qualified) 2983 // same object type (or a reference to it), to a (possibly 2984 // cv-qualified) base class of that type (or a reference to it), 2985 // or to (possibly cv-qualified) void. 2986 // FIXME: Suppress this warning if the conversion function ends up being a 2987 // virtual function that overrides a virtual function in a base class. 2988 QualType ClassType 2989 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2990 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2991 ConvType = ConvTypeRef->getPointeeType(); 2992 if (ConvType->isRecordType()) { 2993 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2994 if (ConvType == ClassType) 2995 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2996 << ClassType; 2997 else if (IsDerivedFrom(ClassType, ConvType)) 2998 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2999 << ClassType << ConvType; 3000 } else if (ConvType->isVoidType()) { 3001 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3002 << ClassType << ConvType; 3003 } 3004 3005 if (Conversion->getPrimaryTemplate()) { 3006 // ignore specializations 3007 } else if (Conversion->getPreviousDeclaration()) { 3008 if (FunctionTemplateDecl *ConversionTemplate 3009 = Conversion->getDescribedFunctionTemplate()) { 3010 if (ClassDecl->replaceConversion( 3011 ConversionTemplate->getPreviousDeclaration(), 3012 ConversionTemplate)) 3013 return DeclPtrTy::make(ConversionTemplate); 3014 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3015 Conversion)) 3016 return DeclPtrTy::make(Conversion); 3017 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3018 } else if (FunctionTemplateDecl *ConversionTemplate 3019 = Conversion->getDescribedFunctionTemplate()) 3020 ClassDecl->addConversionFunction(ConversionTemplate); 3021 else 3022 ClassDecl->addConversionFunction(Conversion); 3023 3024 return DeclPtrTy::make(Conversion); 3025} 3026 3027//===----------------------------------------------------------------------===// 3028// Namespace Handling 3029//===----------------------------------------------------------------------===// 3030 3031/// ActOnStartNamespaceDef - This is called at the start of a namespace 3032/// definition. 3033Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3034 SourceLocation IdentLoc, 3035 IdentifierInfo *II, 3036 SourceLocation LBrace, 3037 AttributeList *AttrList) { 3038 NamespaceDecl *Namespc = 3039 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3040 Namespc->setLBracLoc(LBrace); 3041 3042 Scope *DeclRegionScope = NamespcScope->getParent(); 3043 3044 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3045 3046 if (II) { 3047 // C++ [namespace.def]p2: 3048 // The identifier in an original-namespace-definition shall not have been 3049 // previously defined in the declarative region in which the 3050 // original-namespace-definition appears. The identifier in an 3051 // original-namespace-definition is the name of the namespace. Subsequently 3052 // in that declarative region, it is treated as an original-namespace-name. 3053 3054 NamedDecl *PrevDecl 3055 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3056 ForRedeclaration); 3057 3058 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3059 // This is an extended namespace definition. 3060 // Attach this namespace decl to the chain of extended namespace 3061 // definitions. 3062 OrigNS->setNextNamespace(Namespc); 3063 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3064 3065 // Remove the previous declaration from the scope. 3066 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3067 IdResolver.RemoveDecl(OrigNS); 3068 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3069 } 3070 } else if (PrevDecl) { 3071 // This is an invalid name redefinition. 3072 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3073 << Namespc->getDeclName(); 3074 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3075 Namespc->setInvalidDecl(); 3076 // Continue on to push Namespc as current DeclContext and return it. 3077 } else if (II->isStr("std") && 3078 CurContext->getLookupContext()->isTranslationUnit()) { 3079 // This is the first "real" definition of the namespace "std", so update 3080 // our cache of the "std" namespace to point at this definition. 3081 if (StdNamespace) { 3082 // We had already defined a dummy namespace "std". Link this new 3083 // namespace definition to the dummy namespace "std". 3084 StdNamespace->setNextNamespace(Namespc); 3085 StdNamespace->setLocation(IdentLoc); 3086 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3087 } 3088 3089 // Make our StdNamespace cache point at the first real definition of the 3090 // "std" namespace. 3091 StdNamespace = Namespc; 3092 } 3093 3094 PushOnScopeChains(Namespc, DeclRegionScope); 3095 } else { 3096 // Anonymous namespaces. 3097 assert(Namespc->isAnonymousNamespace()); 3098 3099 // Link the anonymous namespace into its parent. 3100 NamespaceDecl *PrevDecl; 3101 DeclContext *Parent = CurContext->getLookupContext(); 3102 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3103 PrevDecl = TU->getAnonymousNamespace(); 3104 TU->setAnonymousNamespace(Namespc); 3105 } else { 3106 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3107 PrevDecl = ND->getAnonymousNamespace(); 3108 ND->setAnonymousNamespace(Namespc); 3109 } 3110 3111 // Link the anonymous namespace with its previous declaration. 3112 if (PrevDecl) { 3113 assert(PrevDecl->isAnonymousNamespace()); 3114 assert(!PrevDecl->getNextNamespace()); 3115 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3116 PrevDecl->setNextNamespace(Namespc); 3117 } 3118 3119 CurContext->addDecl(Namespc); 3120 3121 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3122 // behaves as if it were replaced by 3123 // namespace unique { /* empty body */ } 3124 // using namespace unique; 3125 // namespace unique { namespace-body } 3126 // where all occurrences of 'unique' in a translation unit are 3127 // replaced by the same identifier and this identifier differs 3128 // from all other identifiers in the entire program. 3129 3130 // We just create the namespace with an empty name and then add an 3131 // implicit using declaration, just like the standard suggests. 3132 // 3133 // CodeGen enforces the "universally unique" aspect by giving all 3134 // declarations semantically contained within an anonymous 3135 // namespace internal linkage. 3136 3137 if (!PrevDecl) { 3138 UsingDirectiveDecl* UD 3139 = UsingDirectiveDecl::Create(Context, CurContext, 3140 /* 'using' */ LBrace, 3141 /* 'namespace' */ SourceLocation(), 3142 /* qualifier */ SourceRange(), 3143 /* NNS */ NULL, 3144 /* identifier */ SourceLocation(), 3145 Namespc, 3146 /* Ancestor */ CurContext); 3147 UD->setImplicit(); 3148 CurContext->addDecl(UD); 3149 } 3150 } 3151 3152 // Although we could have an invalid decl (i.e. the namespace name is a 3153 // redefinition), push it as current DeclContext and try to continue parsing. 3154 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3155 // for the namespace has the declarations that showed up in that particular 3156 // namespace definition. 3157 PushDeclContext(NamespcScope, Namespc); 3158 return DeclPtrTy::make(Namespc); 3159} 3160 3161/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3162/// is a namespace alias, returns the namespace it points to. 3163static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3164 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3165 return AD->getNamespace(); 3166 return dyn_cast_or_null<NamespaceDecl>(D); 3167} 3168 3169/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3170/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3171void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3172 Decl *Dcl = D.getAs<Decl>(); 3173 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3174 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3175 Namespc->setRBracLoc(RBrace); 3176 PopDeclContext(); 3177} 3178 3179Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3180 SourceLocation UsingLoc, 3181 SourceLocation NamespcLoc, 3182 CXXScopeSpec &SS, 3183 SourceLocation IdentLoc, 3184 IdentifierInfo *NamespcName, 3185 AttributeList *AttrList) { 3186 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3187 assert(NamespcName && "Invalid NamespcName."); 3188 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3189 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3190 3191 UsingDirectiveDecl *UDir = 0; 3192 3193 // Lookup namespace name. 3194 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3195 LookupParsedName(R, S, &SS); 3196 if (R.isAmbiguous()) 3197 return DeclPtrTy(); 3198 3199 if (!R.empty()) { 3200 NamedDecl *Named = R.getFoundDecl(); 3201 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3202 && "expected namespace decl"); 3203 // C++ [namespace.udir]p1: 3204 // A using-directive specifies that the names in the nominated 3205 // namespace can be used in the scope in which the 3206 // using-directive appears after the using-directive. During 3207 // unqualified name lookup (3.4.1), the names appear as if they 3208 // were declared in the nearest enclosing namespace which 3209 // contains both the using-directive and the nominated 3210 // namespace. [Note: in this context, "contains" means "contains 3211 // directly or indirectly". ] 3212 3213 // Find enclosing context containing both using-directive and 3214 // nominated namespace. 3215 NamespaceDecl *NS = getNamespaceDecl(Named); 3216 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3217 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3218 CommonAncestor = CommonAncestor->getParent(); 3219 3220 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3221 SS.getRange(), 3222 (NestedNameSpecifier *)SS.getScopeRep(), 3223 IdentLoc, Named, CommonAncestor); 3224 PushUsingDirective(S, UDir); 3225 } else { 3226 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3227 } 3228 3229 // FIXME: We ignore attributes for now. 3230 delete AttrList; 3231 return DeclPtrTy::make(UDir); 3232} 3233 3234void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3235 // If scope has associated entity, then using directive is at namespace 3236 // or translation unit scope. We add UsingDirectiveDecls, into 3237 // it's lookup structure. 3238 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3239 Ctx->addDecl(UDir); 3240 else 3241 // Otherwise it is block-sope. using-directives will affect lookup 3242 // only to the end of scope. 3243 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3244} 3245 3246 3247Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3248 AccessSpecifier AS, 3249 bool HasUsingKeyword, 3250 SourceLocation UsingLoc, 3251 CXXScopeSpec &SS, 3252 UnqualifiedId &Name, 3253 AttributeList *AttrList, 3254 bool IsTypeName, 3255 SourceLocation TypenameLoc) { 3256 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3257 3258 switch (Name.getKind()) { 3259 case UnqualifiedId::IK_Identifier: 3260 case UnqualifiedId::IK_OperatorFunctionId: 3261 case UnqualifiedId::IK_LiteralOperatorId: 3262 case UnqualifiedId::IK_ConversionFunctionId: 3263 break; 3264 3265 case UnqualifiedId::IK_ConstructorName: 3266 case UnqualifiedId::IK_ConstructorTemplateId: 3267 // C++0x inherited constructors. 3268 if (getLangOptions().CPlusPlus0x) break; 3269 3270 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3271 << SS.getRange(); 3272 return DeclPtrTy(); 3273 3274 case UnqualifiedId::IK_DestructorName: 3275 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3276 << SS.getRange(); 3277 return DeclPtrTy(); 3278 3279 case UnqualifiedId::IK_TemplateId: 3280 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3281 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3282 return DeclPtrTy(); 3283 } 3284 3285 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3286 if (!TargetName) 3287 return DeclPtrTy(); 3288 3289 // Warn about using declarations. 3290 // TODO: store that the declaration was written without 'using' and 3291 // talk about access decls instead of using decls in the 3292 // diagnostics. 3293 if (!HasUsingKeyword) { 3294 UsingLoc = Name.getSourceRange().getBegin(); 3295 3296 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3297 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3298 } 3299 3300 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3301 Name.getSourceRange().getBegin(), 3302 TargetName, AttrList, 3303 /* IsInstantiation */ false, 3304 IsTypeName, TypenameLoc); 3305 if (UD) 3306 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3307 3308 return DeclPtrTy::make(UD); 3309} 3310 3311/// Determines whether to create a using shadow decl for a particular 3312/// decl, given the set of decls existing prior to this using lookup. 3313bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3314 const LookupResult &Previous) { 3315 // Diagnose finding a decl which is not from a base class of the 3316 // current class. We do this now because there are cases where this 3317 // function will silently decide not to build a shadow decl, which 3318 // will pre-empt further diagnostics. 3319 // 3320 // We don't need to do this in C++0x because we do the check once on 3321 // the qualifier. 3322 // 3323 // FIXME: diagnose the following if we care enough: 3324 // struct A { int foo; }; 3325 // struct B : A { using A::foo; }; 3326 // template <class T> struct C : A {}; 3327 // template <class T> struct D : C<T> { using B::foo; } // <--- 3328 // This is invalid (during instantiation) in C++03 because B::foo 3329 // resolves to the using decl in B, which is not a base class of D<T>. 3330 // We can't diagnose it immediately because C<T> is an unknown 3331 // specialization. The UsingShadowDecl in D<T> then points directly 3332 // to A::foo, which will look well-formed when we instantiate. 3333 // The right solution is to not collapse the shadow-decl chain. 3334 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3335 DeclContext *OrigDC = Orig->getDeclContext(); 3336 3337 // Handle enums and anonymous structs. 3338 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3339 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3340 while (OrigRec->isAnonymousStructOrUnion()) 3341 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3342 3343 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3344 if (OrigDC == CurContext) { 3345 Diag(Using->getLocation(), 3346 diag::err_using_decl_nested_name_specifier_is_current_class) 3347 << Using->getNestedNameRange(); 3348 Diag(Orig->getLocation(), diag::note_using_decl_target); 3349 return true; 3350 } 3351 3352 Diag(Using->getNestedNameRange().getBegin(), 3353 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3354 << Using->getTargetNestedNameDecl() 3355 << cast<CXXRecordDecl>(CurContext) 3356 << Using->getNestedNameRange(); 3357 Diag(Orig->getLocation(), diag::note_using_decl_target); 3358 return true; 3359 } 3360 } 3361 3362 if (Previous.empty()) return false; 3363 3364 NamedDecl *Target = Orig; 3365 if (isa<UsingShadowDecl>(Target)) 3366 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3367 3368 // If the target happens to be one of the previous declarations, we 3369 // don't have a conflict. 3370 // 3371 // FIXME: but we might be increasing its access, in which case we 3372 // should redeclare it. 3373 NamedDecl *NonTag = 0, *Tag = 0; 3374 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3375 I != E; ++I) { 3376 NamedDecl *D = (*I)->getUnderlyingDecl(); 3377 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3378 return false; 3379 3380 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3381 } 3382 3383 if (Target->isFunctionOrFunctionTemplate()) { 3384 FunctionDecl *FD; 3385 if (isa<FunctionTemplateDecl>(Target)) 3386 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3387 else 3388 FD = cast<FunctionDecl>(Target); 3389 3390 NamedDecl *OldDecl = 0; 3391 switch (CheckOverload(FD, Previous, OldDecl)) { 3392 case Ovl_Overload: 3393 return false; 3394 3395 case Ovl_NonFunction: 3396 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3397 break; 3398 3399 // We found a decl with the exact signature. 3400 case Ovl_Match: 3401 if (isa<UsingShadowDecl>(OldDecl)) { 3402 // Silently ignore the possible conflict. 3403 return false; 3404 } 3405 3406 // If we're in a record, we want to hide the target, so we 3407 // return true (without a diagnostic) to tell the caller not to 3408 // build a shadow decl. 3409 if (CurContext->isRecord()) 3410 return true; 3411 3412 // If we're not in a record, this is an error. 3413 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3414 break; 3415 } 3416 3417 Diag(Target->getLocation(), diag::note_using_decl_target); 3418 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3419 return true; 3420 } 3421 3422 // Target is not a function. 3423 3424 if (isa<TagDecl>(Target)) { 3425 // No conflict between a tag and a non-tag. 3426 if (!Tag) return false; 3427 3428 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3429 Diag(Target->getLocation(), diag::note_using_decl_target); 3430 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3431 return true; 3432 } 3433 3434 // No conflict between a tag and a non-tag. 3435 if (!NonTag) return false; 3436 3437 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3438 Diag(Target->getLocation(), diag::note_using_decl_target); 3439 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3440 return true; 3441} 3442 3443/// Builds a shadow declaration corresponding to a 'using' declaration. 3444UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3445 UsingDecl *UD, 3446 NamedDecl *Orig) { 3447 3448 // If we resolved to another shadow declaration, just coalesce them. 3449 NamedDecl *Target = Orig; 3450 if (isa<UsingShadowDecl>(Target)) { 3451 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3452 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3453 } 3454 3455 UsingShadowDecl *Shadow 3456 = UsingShadowDecl::Create(Context, CurContext, 3457 UD->getLocation(), UD, Target); 3458 UD->addShadowDecl(Shadow); 3459 3460 if (S) 3461 PushOnScopeChains(Shadow, S); 3462 else 3463 CurContext->addDecl(Shadow); 3464 Shadow->setAccess(UD->getAccess()); 3465 3466 // Register it as a conversion if appropriate. 3467 if (Shadow->getDeclName().getNameKind() 3468 == DeclarationName::CXXConversionFunctionName) 3469 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3470 3471 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3472 Shadow->setInvalidDecl(); 3473 3474 return Shadow; 3475} 3476 3477/// Hides a using shadow declaration. This is required by the current 3478/// using-decl implementation when a resolvable using declaration in a 3479/// class is followed by a declaration which would hide or override 3480/// one or more of the using decl's targets; for example: 3481/// 3482/// struct Base { void foo(int); }; 3483/// struct Derived : Base { 3484/// using Base::foo; 3485/// void foo(int); 3486/// }; 3487/// 3488/// The governing language is C++03 [namespace.udecl]p12: 3489/// 3490/// When a using-declaration brings names from a base class into a 3491/// derived class scope, member functions in the derived class 3492/// override and/or hide member functions with the same name and 3493/// parameter types in a base class (rather than conflicting). 3494/// 3495/// There are two ways to implement this: 3496/// (1) optimistically create shadow decls when they're not hidden 3497/// by existing declarations, or 3498/// (2) don't create any shadow decls (or at least don't make them 3499/// visible) until we've fully parsed/instantiated the class. 3500/// The problem with (1) is that we might have to retroactively remove 3501/// a shadow decl, which requires several O(n) operations because the 3502/// decl structures are (very reasonably) not designed for removal. 3503/// (2) avoids this but is very fiddly and phase-dependent. 3504void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3505 if (Shadow->getDeclName().getNameKind() == 3506 DeclarationName::CXXConversionFunctionName) 3507 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3508 3509 // Remove it from the DeclContext... 3510 Shadow->getDeclContext()->removeDecl(Shadow); 3511 3512 // ...and the scope, if applicable... 3513 if (S) { 3514 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3515 IdResolver.RemoveDecl(Shadow); 3516 } 3517 3518 // ...and the using decl. 3519 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3520 3521 // TODO: complain somehow if Shadow was used. It shouldn't 3522 // be possible for this to happen, because...? 3523} 3524 3525/// Builds a using declaration. 3526/// 3527/// \param IsInstantiation - Whether this call arises from an 3528/// instantiation of an unresolved using declaration. We treat 3529/// the lookup differently for these declarations. 3530NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3531 SourceLocation UsingLoc, 3532 CXXScopeSpec &SS, 3533 SourceLocation IdentLoc, 3534 DeclarationName Name, 3535 AttributeList *AttrList, 3536 bool IsInstantiation, 3537 bool IsTypeName, 3538 SourceLocation TypenameLoc) { 3539 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3540 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3541 3542 // FIXME: We ignore attributes for now. 3543 delete AttrList; 3544 3545 if (SS.isEmpty()) { 3546 Diag(IdentLoc, diag::err_using_requires_qualname); 3547 return 0; 3548 } 3549 3550 // Do the redeclaration lookup in the current scope. 3551 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3552 ForRedeclaration); 3553 Previous.setHideTags(false); 3554 if (S) { 3555 LookupName(Previous, S); 3556 3557 // It is really dumb that we have to do this. 3558 LookupResult::Filter F = Previous.makeFilter(); 3559 while (F.hasNext()) { 3560 NamedDecl *D = F.next(); 3561 if (!isDeclInScope(D, CurContext, S)) 3562 F.erase(); 3563 } 3564 F.done(); 3565 } else { 3566 assert(IsInstantiation && "no scope in non-instantiation"); 3567 assert(CurContext->isRecord() && "scope not record in instantiation"); 3568 LookupQualifiedName(Previous, CurContext); 3569 } 3570 3571 NestedNameSpecifier *NNS = 3572 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3573 3574 // Check for invalid redeclarations. 3575 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3576 return 0; 3577 3578 // Check for bad qualifiers. 3579 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3580 return 0; 3581 3582 DeclContext *LookupContext = computeDeclContext(SS); 3583 NamedDecl *D; 3584 if (!LookupContext) { 3585 if (IsTypeName) { 3586 // FIXME: not all declaration name kinds are legal here 3587 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3588 UsingLoc, TypenameLoc, 3589 SS.getRange(), NNS, 3590 IdentLoc, Name); 3591 } else { 3592 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3593 UsingLoc, SS.getRange(), NNS, 3594 IdentLoc, Name); 3595 } 3596 } else { 3597 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3598 SS.getRange(), UsingLoc, NNS, Name, 3599 IsTypeName); 3600 } 3601 D->setAccess(AS); 3602 CurContext->addDecl(D); 3603 3604 if (!LookupContext) return D; 3605 UsingDecl *UD = cast<UsingDecl>(D); 3606 3607 if (RequireCompleteDeclContext(SS)) { 3608 UD->setInvalidDecl(); 3609 return UD; 3610 } 3611 3612 // Look up the target name. 3613 3614 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3615 3616 // Unlike most lookups, we don't always want to hide tag 3617 // declarations: tag names are visible through the using declaration 3618 // even if hidden by ordinary names, *except* in a dependent context 3619 // where it's important for the sanity of two-phase lookup. 3620 if (!IsInstantiation) 3621 R.setHideTags(false); 3622 3623 LookupQualifiedName(R, LookupContext); 3624 3625 if (R.empty()) { 3626 Diag(IdentLoc, diag::err_no_member) 3627 << Name << LookupContext << SS.getRange(); 3628 UD->setInvalidDecl(); 3629 return UD; 3630 } 3631 3632 if (R.isAmbiguous()) { 3633 UD->setInvalidDecl(); 3634 return UD; 3635 } 3636 3637 if (IsTypeName) { 3638 // If we asked for a typename and got a non-type decl, error out. 3639 if (!R.getAsSingle<TypeDecl>()) { 3640 Diag(IdentLoc, diag::err_using_typename_non_type); 3641 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3642 Diag((*I)->getUnderlyingDecl()->getLocation(), 3643 diag::note_using_decl_target); 3644 UD->setInvalidDecl(); 3645 return UD; 3646 } 3647 } else { 3648 // If we asked for a non-typename and we got a type, error out, 3649 // but only if this is an instantiation of an unresolved using 3650 // decl. Otherwise just silently find the type name. 3651 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3652 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3653 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3654 UD->setInvalidDecl(); 3655 return UD; 3656 } 3657 } 3658 3659 // C++0x N2914 [namespace.udecl]p6: 3660 // A using-declaration shall not name a namespace. 3661 if (R.getAsSingle<NamespaceDecl>()) { 3662 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3663 << SS.getRange(); 3664 UD->setInvalidDecl(); 3665 return UD; 3666 } 3667 3668 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3669 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3670 BuildUsingShadowDecl(S, UD, *I); 3671 } 3672 3673 return UD; 3674} 3675 3676/// Checks that the given using declaration is not an invalid 3677/// redeclaration. Note that this is checking only for the using decl 3678/// itself, not for any ill-formedness among the UsingShadowDecls. 3679bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3680 bool isTypeName, 3681 const CXXScopeSpec &SS, 3682 SourceLocation NameLoc, 3683 const LookupResult &Prev) { 3684 // C++03 [namespace.udecl]p8: 3685 // C++0x [namespace.udecl]p10: 3686 // A using-declaration is a declaration and can therefore be used 3687 // repeatedly where (and only where) multiple declarations are 3688 // allowed. 3689 // That's only in file contexts. 3690 if (CurContext->getLookupContext()->isFileContext()) 3691 return false; 3692 3693 NestedNameSpecifier *Qual 3694 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3695 3696 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3697 NamedDecl *D = *I; 3698 3699 bool DTypename; 3700 NestedNameSpecifier *DQual; 3701 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3702 DTypename = UD->isTypeName(); 3703 DQual = UD->getTargetNestedNameDecl(); 3704 } else if (UnresolvedUsingValueDecl *UD 3705 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3706 DTypename = false; 3707 DQual = UD->getTargetNestedNameSpecifier(); 3708 } else if (UnresolvedUsingTypenameDecl *UD 3709 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3710 DTypename = true; 3711 DQual = UD->getTargetNestedNameSpecifier(); 3712 } else continue; 3713 3714 // using decls differ if one says 'typename' and the other doesn't. 3715 // FIXME: non-dependent using decls? 3716 if (isTypeName != DTypename) continue; 3717 3718 // using decls differ if they name different scopes (but note that 3719 // template instantiation can cause this check to trigger when it 3720 // didn't before instantiation). 3721 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3722 Context.getCanonicalNestedNameSpecifier(DQual)) 3723 continue; 3724 3725 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3726 Diag(D->getLocation(), diag::note_using_decl) << 1; 3727 return true; 3728 } 3729 3730 return false; 3731} 3732 3733 3734/// Checks that the given nested-name qualifier used in a using decl 3735/// in the current context is appropriately related to the current 3736/// scope. If an error is found, diagnoses it and returns true. 3737bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3738 const CXXScopeSpec &SS, 3739 SourceLocation NameLoc) { 3740 DeclContext *NamedContext = computeDeclContext(SS); 3741 3742 if (!CurContext->isRecord()) { 3743 // C++03 [namespace.udecl]p3: 3744 // C++0x [namespace.udecl]p8: 3745 // A using-declaration for a class member shall be a member-declaration. 3746 3747 // If we weren't able to compute a valid scope, it must be a 3748 // dependent class scope. 3749 if (!NamedContext || NamedContext->isRecord()) { 3750 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3751 << SS.getRange(); 3752 return true; 3753 } 3754 3755 // Otherwise, everything is known to be fine. 3756 return false; 3757 } 3758 3759 // The current scope is a record. 3760 3761 // If the named context is dependent, we can't decide much. 3762 if (!NamedContext) { 3763 // FIXME: in C++0x, we can diagnose if we can prove that the 3764 // nested-name-specifier does not refer to a base class, which is 3765 // still possible in some cases. 3766 3767 // Otherwise we have to conservatively report that things might be 3768 // okay. 3769 return false; 3770 } 3771 3772 if (!NamedContext->isRecord()) { 3773 // Ideally this would point at the last name in the specifier, 3774 // but we don't have that level of source info. 3775 Diag(SS.getRange().getBegin(), 3776 diag::err_using_decl_nested_name_specifier_is_not_class) 3777 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3778 return true; 3779 } 3780 3781 if (getLangOptions().CPlusPlus0x) { 3782 // C++0x [namespace.udecl]p3: 3783 // In a using-declaration used as a member-declaration, the 3784 // nested-name-specifier shall name a base class of the class 3785 // being defined. 3786 3787 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3788 cast<CXXRecordDecl>(NamedContext))) { 3789 if (CurContext == NamedContext) { 3790 Diag(NameLoc, 3791 diag::err_using_decl_nested_name_specifier_is_current_class) 3792 << SS.getRange(); 3793 return true; 3794 } 3795 3796 Diag(SS.getRange().getBegin(), 3797 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3798 << (NestedNameSpecifier*) SS.getScopeRep() 3799 << cast<CXXRecordDecl>(CurContext) 3800 << SS.getRange(); 3801 return true; 3802 } 3803 3804 return false; 3805 } 3806 3807 // C++03 [namespace.udecl]p4: 3808 // A using-declaration used as a member-declaration shall refer 3809 // to a member of a base class of the class being defined [etc.]. 3810 3811 // Salient point: SS doesn't have to name a base class as long as 3812 // lookup only finds members from base classes. Therefore we can 3813 // diagnose here only if we can prove that that can't happen, 3814 // i.e. if the class hierarchies provably don't intersect. 3815 3816 // TODO: it would be nice if "definitely valid" results were cached 3817 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3818 // need to be repeated. 3819 3820 struct UserData { 3821 llvm::DenseSet<const CXXRecordDecl*> Bases; 3822 3823 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3824 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3825 Data->Bases.insert(Base); 3826 return true; 3827 } 3828 3829 bool hasDependentBases(const CXXRecordDecl *Class) { 3830 return !Class->forallBases(collect, this); 3831 } 3832 3833 /// Returns true if the base is dependent or is one of the 3834 /// accumulated base classes. 3835 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3836 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3837 return !Data->Bases.count(Base); 3838 } 3839 3840 bool mightShareBases(const CXXRecordDecl *Class) { 3841 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3842 } 3843 }; 3844 3845 UserData Data; 3846 3847 // Returns false if we find a dependent base. 3848 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3849 return false; 3850 3851 // Returns false if the class has a dependent base or if it or one 3852 // of its bases is present in the base set of the current context. 3853 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3854 return false; 3855 3856 Diag(SS.getRange().getBegin(), 3857 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3858 << (NestedNameSpecifier*) SS.getScopeRep() 3859 << cast<CXXRecordDecl>(CurContext) 3860 << SS.getRange(); 3861 3862 return true; 3863} 3864 3865Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3866 SourceLocation NamespaceLoc, 3867 SourceLocation AliasLoc, 3868 IdentifierInfo *Alias, 3869 CXXScopeSpec &SS, 3870 SourceLocation IdentLoc, 3871 IdentifierInfo *Ident) { 3872 3873 // Lookup the namespace name. 3874 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3875 LookupParsedName(R, S, &SS); 3876 3877 // Check if we have a previous declaration with the same name. 3878 if (NamedDecl *PrevDecl 3879 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 3880 ForRedeclaration)) { 3881 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3882 // We already have an alias with the same name that points to the same 3883 // namespace, so don't create a new one. 3884 // FIXME: At some point, we'll want to create the (redundant) 3885 // declaration to maintain better source information. 3886 if (!R.isAmbiguous() && !R.empty() && 3887 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3888 return DeclPtrTy(); 3889 } 3890 3891 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3892 diag::err_redefinition_different_kind; 3893 Diag(AliasLoc, DiagID) << Alias; 3894 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3895 return DeclPtrTy(); 3896 } 3897 3898 if (R.isAmbiguous()) 3899 return DeclPtrTy(); 3900 3901 if (R.empty()) { 3902 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3903 return DeclPtrTy(); 3904 } 3905 3906 NamespaceAliasDecl *AliasDecl = 3907 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3908 Alias, SS.getRange(), 3909 (NestedNameSpecifier *)SS.getScopeRep(), 3910 IdentLoc, R.getFoundDecl()); 3911 3912 PushOnScopeChains(AliasDecl, S); 3913 return DeclPtrTy::make(AliasDecl); 3914} 3915 3916void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3917 CXXConstructorDecl *Constructor) { 3918 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3919 !Constructor->isUsed()) && 3920 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3921 3922 CXXRecordDecl *ClassDecl 3923 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3924 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3925 3926 DeclContext *PreviousContext = CurContext; 3927 CurContext = Constructor; 3928 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3929 Diag(CurrentLocation, diag::note_member_synthesized_at) 3930 << CXXConstructor << Context.getTagDeclType(ClassDecl); 3931 Constructor->setInvalidDecl(); 3932 } else { 3933 Constructor->setUsed(); 3934 } 3935 CurContext = PreviousContext; 3936} 3937 3938void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3939 CXXDestructorDecl *Destructor) { 3940 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3941 "DefineImplicitDestructor - call it for implicit default dtor"); 3942 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3943 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3944 3945 DeclContext *PreviousContext = CurContext; 3946 CurContext = Destructor; 3947 3948 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3949 Destructor->getParent()); 3950 3951 // FIXME: If CheckDestructor fails, we should emit a note about where the 3952 // implicit destructor was needed. 3953 if (CheckDestructor(Destructor)) { 3954 Diag(CurrentLocation, diag::note_member_synthesized_at) 3955 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3956 3957 Destructor->setInvalidDecl(); 3958 CurContext = PreviousContext; 3959 3960 return; 3961 } 3962 CurContext = PreviousContext; 3963 3964 Destructor->setUsed(); 3965} 3966 3967void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3968 CXXMethodDecl *MethodDecl) { 3969 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3970 MethodDecl->getOverloadedOperator() == OO_Equal && 3971 !MethodDecl->isUsed()) && 3972 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3973 3974 CXXRecordDecl *ClassDecl 3975 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3976 3977 DeclContext *PreviousContext = CurContext; 3978 CurContext = MethodDecl; 3979 3980 // C++[class.copy] p12 3981 // Before the implicitly-declared copy assignment operator for a class is 3982 // implicitly defined, all implicitly-declared copy assignment operators 3983 // for its direct base classes and its nonstatic data members shall have 3984 // been implicitly defined. 3985 bool err = false; 3986 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3987 E = ClassDecl->bases_end(); Base != E; ++Base) { 3988 CXXRecordDecl *BaseClassDecl 3989 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3990 if (CXXMethodDecl *BaseAssignOpMethod = 3991 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3992 BaseClassDecl)) { 3993 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3994 BaseAssignOpMethod, 3995 PDiag(diag::err_access_assign_base) 3996 << Base->getType()); 3997 3998 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3999 } 4000 } 4001 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4002 E = ClassDecl->field_end(); Field != E; ++Field) { 4003 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4004 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4005 FieldType = Array->getElementType(); 4006 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4007 CXXRecordDecl *FieldClassDecl 4008 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4009 if (CXXMethodDecl *FieldAssignOpMethod = 4010 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 4011 FieldClassDecl)) { 4012 CheckDirectMemberAccess(Field->getLocation(), 4013 FieldAssignOpMethod, 4014 PDiag(diag::err_access_assign_field) 4015 << Field->getDeclName() << Field->getType()); 4016 4017 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 4018 } 4019 } else if (FieldType->isReferenceType()) { 4020 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4021 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4022 Diag(Field->getLocation(), diag::note_declared_at); 4023 Diag(CurrentLocation, diag::note_first_required_here); 4024 err = true; 4025 } else if (FieldType.isConstQualified()) { 4026 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4027 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4028 Diag(Field->getLocation(), diag::note_declared_at); 4029 Diag(CurrentLocation, diag::note_first_required_here); 4030 err = true; 4031 } 4032 } 4033 if (!err) 4034 MethodDecl->setUsed(); 4035 4036 CurContext = PreviousContext; 4037} 4038 4039CXXMethodDecl * 4040Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4041 ParmVarDecl *ParmDecl, 4042 CXXRecordDecl *ClassDecl) { 4043 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4044 QualType RHSType(LHSType); 4045 // If class's assignment operator argument is const/volatile qualified, 4046 // look for operator = (const/volatile B&). Otherwise, look for 4047 // operator = (B&). 4048 RHSType = Context.getCVRQualifiedType(RHSType, 4049 ParmDecl->getType().getCVRQualifiers()); 4050 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4051 LHSType, 4052 SourceLocation())); 4053 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4054 RHSType, 4055 CurrentLocation)); 4056 Expr *Args[2] = { &*LHS, &*RHS }; 4057 OverloadCandidateSet CandidateSet(CurrentLocation); 4058 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4059 CandidateSet); 4060 OverloadCandidateSet::iterator Best; 4061 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4062 return cast<CXXMethodDecl>(Best->Function); 4063 assert(false && 4064 "getAssignOperatorMethod - copy assignment operator method not found"); 4065 return 0; 4066} 4067 4068void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4069 CXXConstructorDecl *CopyConstructor, 4070 unsigned TypeQuals) { 4071 assert((CopyConstructor->isImplicit() && 4072 CopyConstructor->isCopyConstructor(TypeQuals) && 4073 !CopyConstructor->isUsed()) && 4074 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4075 4076 CXXRecordDecl *ClassDecl 4077 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 4078 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4079 4080 DeclContext *PreviousContext = CurContext; 4081 CurContext = CopyConstructor; 4082 4083 // C++ [class.copy] p209 4084 // Before the implicitly-declared copy constructor for a class is 4085 // implicitly defined, all the implicitly-declared copy constructors 4086 // for its base class and its non-static data members shall have been 4087 // implicitly defined. 4088 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 4089 Base != ClassDecl->bases_end(); ++Base) { 4090 CXXRecordDecl *BaseClassDecl 4091 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4092 if (CXXConstructorDecl *BaseCopyCtor = 4093 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4094 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4095 BaseCopyCtor, 4096 PDiag(diag::err_access_copy_base) 4097 << Base->getType()); 4098 4099 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4100 } 4101 } 4102 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4103 FieldEnd = ClassDecl->field_end(); 4104 Field != FieldEnd; ++Field) { 4105 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4106 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4107 FieldType = Array->getElementType(); 4108 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4109 CXXRecordDecl *FieldClassDecl 4110 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4111 if (CXXConstructorDecl *FieldCopyCtor = 4112 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4113 CheckDirectMemberAccess(Field->getLocation(), 4114 FieldCopyCtor, 4115 PDiag(diag::err_access_copy_field) 4116 << Field->getDeclName() << Field->getType()); 4117 4118 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4119 } 4120 } 4121 } 4122 CopyConstructor->setUsed(); 4123 4124 CurContext = PreviousContext; 4125} 4126 4127Sema::OwningExprResult 4128Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4129 CXXConstructorDecl *Constructor, 4130 MultiExprArg ExprArgs, 4131 bool RequiresZeroInit, 4132 bool BaseInitialization) { 4133 bool Elidable = false; 4134 4135 // C++0x [class.copy]p34: 4136 // When certain criteria are met, an implementation is allowed to 4137 // omit the copy/move construction of a class object, even if the 4138 // copy/move constructor and/or destructor for the object have 4139 // side effects. [...] 4140 // - when a temporary class object that has not been bound to a 4141 // reference (12.2) would be copied/moved to a class object 4142 // with the same cv-unqualified type, the copy/move operation 4143 // can be omitted by constructing the temporary object 4144 // directly into the target of the omitted copy/move 4145 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4146 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4147 Elidable = SubExpr->isTemporaryObject() && 4148 Context.hasSameUnqualifiedType(SubExpr->getType(), 4149 Context.getTypeDeclType(Constructor->getParent())); 4150 } 4151 4152 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4153 Elidable, move(ExprArgs), RequiresZeroInit, 4154 BaseInitialization); 4155} 4156 4157/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4158/// including handling of its default argument expressions. 4159Sema::OwningExprResult 4160Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4161 CXXConstructorDecl *Constructor, bool Elidable, 4162 MultiExprArg ExprArgs, 4163 bool RequiresZeroInit, 4164 bool BaseInitialization) { 4165 unsigned NumExprs = ExprArgs.size(); 4166 Expr **Exprs = (Expr **)ExprArgs.release(); 4167 4168 MarkDeclarationReferenced(ConstructLoc, Constructor); 4169 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4170 Constructor, Elidable, Exprs, NumExprs, 4171 RequiresZeroInit, BaseInitialization)); 4172} 4173 4174bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4175 CXXConstructorDecl *Constructor, 4176 MultiExprArg Exprs) { 4177 OwningExprResult TempResult = 4178 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4179 move(Exprs)); 4180 if (TempResult.isInvalid()) 4181 return true; 4182 4183 Expr *Temp = TempResult.takeAs<Expr>(); 4184 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4185 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4186 VD->setInit(Temp); 4187 4188 return false; 4189} 4190 4191void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4192 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4193 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4194 !ClassDecl->hasTrivialDestructor()) { 4195 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4196 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4197 CheckDestructorAccess(VD->getLocation(), Destructor, 4198 PDiag(diag::err_access_dtor_var) 4199 << VD->getDeclName() 4200 << VD->getType()); 4201 } 4202} 4203 4204/// AddCXXDirectInitializerToDecl - This action is called immediately after 4205/// ActOnDeclarator, when a C++ direct initializer is present. 4206/// e.g: "int x(1);" 4207void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4208 SourceLocation LParenLoc, 4209 MultiExprArg Exprs, 4210 SourceLocation *CommaLocs, 4211 SourceLocation RParenLoc) { 4212 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4213 Decl *RealDecl = Dcl.getAs<Decl>(); 4214 4215 // If there is no declaration, there was an error parsing it. Just ignore 4216 // the initializer. 4217 if (RealDecl == 0) 4218 return; 4219 4220 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4221 if (!VDecl) { 4222 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4223 RealDecl->setInvalidDecl(); 4224 return; 4225 } 4226 4227 // We will represent direct-initialization similarly to copy-initialization: 4228 // int x(1); -as-> int x = 1; 4229 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4230 // 4231 // Clients that want to distinguish between the two forms, can check for 4232 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4233 // A major benefit is that clients that don't particularly care about which 4234 // exactly form was it (like the CodeGen) can handle both cases without 4235 // special case code. 4236 4237 // C++ 8.5p11: 4238 // The form of initialization (using parentheses or '=') is generally 4239 // insignificant, but does matter when the entity being initialized has a 4240 // class type. 4241 QualType DeclInitType = VDecl->getType(); 4242 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4243 DeclInitType = Context.getBaseElementType(Array); 4244 4245 if (!VDecl->getType()->isDependentType() && 4246 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4247 diag::err_typecheck_decl_incomplete_type)) { 4248 VDecl->setInvalidDecl(); 4249 return; 4250 } 4251 4252 // The variable can not have an abstract class type. 4253 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4254 diag::err_abstract_type_in_decl, 4255 AbstractVariableType)) 4256 VDecl->setInvalidDecl(); 4257 4258 const VarDecl *Def; 4259 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4260 Diag(VDecl->getLocation(), diag::err_redefinition) 4261 << VDecl->getDeclName(); 4262 Diag(Def->getLocation(), diag::note_previous_definition); 4263 VDecl->setInvalidDecl(); 4264 return; 4265 } 4266 4267 // If either the declaration has a dependent type or if any of the 4268 // expressions is type-dependent, we represent the initialization 4269 // via a ParenListExpr for later use during template instantiation. 4270 if (VDecl->getType()->isDependentType() || 4271 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4272 // Let clients know that initialization was done with a direct initializer. 4273 VDecl->setCXXDirectInitializer(true); 4274 4275 // Store the initialization expressions as a ParenListExpr. 4276 unsigned NumExprs = Exprs.size(); 4277 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4278 (Expr **)Exprs.release(), 4279 NumExprs, RParenLoc)); 4280 return; 4281 } 4282 4283 // Capture the variable that is being initialized and the style of 4284 // initialization. 4285 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4286 4287 // FIXME: Poor source location information. 4288 InitializationKind Kind 4289 = InitializationKind::CreateDirect(VDecl->getLocation(), 4290 LParenLoc, RParenLoc); 4291 4292 InitializationSequence InitSeq(*this, Entity, Kind, 4293 (Expr**)Exprs.get(), Exprs.size()); 4294 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4295 if (Result.isInvalid()) { 4296 VDecl->setInvalidDecl(); 4297 return; 4298 } 4299 4300 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4301 VDecl->setInit(Result.takeAs<Expr>()); 4302 VDecl->setCXXDirectInitializer(true); 4303 4304 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4305 FinalizeVarWithDestructor(VDecl, Record); 4306} 4307 4308/// \brief Given a constructor and the set of arguments provided for the 4309/// constructor, convert the arguments and add any required default arguments 4310/// to form a proper call to this constructor. 4311/// 4312/// \returns true if an error occurred, false otherwise. 4313bool 4314Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4315 MultiExprArg ArgsPtr, 4316 SourceLocation Loc, 4317 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4318 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4319 unsigned NumArgs = ArgsPtr.size(); 4320 Expr **Args = (Expr **)ArgsPtr.get(); 4321 4322 const FunctionProtoType *Proto 4323 = Constructor->getType()->getAs<FunctionProtoType>(); 4324 assert(Proto && "Constructor without a prototype?"); 4325 unsigned NumArgsInProto = Proto->getNumArgs(); 4326 4327 // If too few arguments are available, we'll fill in the rest with defaults. 4328 if (NumArgs < NumArgsInProto) 4329 ConvertedArgs.reserve(NumArgsInProto); 4330 else 4331 ConvertedArgs.reserve(NumArgs); 4332 4333 VariadicCallType CallType = 4334 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4335 llvm::SmallVector<Expr *, 8> AllArgs; 4336 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4337 Proto, 0, Args, NumArgs, AllArgs, 4338 CallType); 4339 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4340 ConvertedArgs.push_back(AllArgs[i]); 4341 return Invalid; 4342} 4343 4344static inline bool 4345CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4346 const FunctionDecl *FnDecl) { 4347 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4348 if (isa<NamespaceDecl>(DC)) { 4349 return SemaRef.Diag(FnDecl->getLocation(), 4350 diag::err_operator_new_delete_declared_in_namespace) 4351 << FnDecl->getDeclName(); 4352 } 4353 4354 if (isa<TranslationUnitDecl>(DC) && 4355 FnDecl->getStorageClass() == FunctionDecl::Static) { 4356 return SemaRef.Diag(FnDecl->getLocation(), 4357 diag::err_operator_new_delete_declared_static) 4358 << FnDecl->getDeclName(); 4359 } 4360 4361 return false; 4362} 4363 4364static inline bool 4365CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4366 CanQualType ExpectedResultType, 4367 CanQualType ExpectedFirstParamType, 4368 unsigned DependentParamTypeDiag, 4369 unsigned InvalidParamTypeDiag) { 4370 QualType ResultType = 4371 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4372 4373 // Check that the result type is not dependent. 4374 if (ResultType->isDependentType()) 4375 return SemaRef.Diag(FnDecl->getLocation(), 4376 diag::err_operator_new_delete_dependent_result_type) 4377 << FnDecl->getDeclName() << ExpectedResultType; 4378 4379 // Check that the result type is what we expect. 4380 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4381 return SemaRef.Diag(FnDecl->getLocation(), 4382 diag::err_operator_new_delete_invalid_result_type) 4383 << FnDecl->getDeclName() << ExpectedResultType; 4384 4385 // A function template must have at least 2 parameters. 4386 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4387 return SemaRef.Diag(FnDecl->getLocation(), 4388 diag::err_operator_new_delete_template_too_few_parameters) 4389 << FnDecl->getDeclName(); 4390 4391 // The function decl must have at least 1 parameter. 4392 if (FnDecl->getNumParams() == 0) 4393 return SemaRef.Diag(FnDecl->getLocation(), 4394 diag::err_operator_new_delete_too_few_parameters) 4395 << FnDecl->getDeclName(); 4396 4397 // Check the the first parameter type is not dependent. 4398 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4399 if (FirstParamType->isDependentType()) 4400 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4401 << FnDecl->getDeclName() << ExpectedFirstParamType; 4402 4403 // Check that the first parameter type is what we expect. 4404 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4405 ExpectedFirstParamType) 4406 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4407 << FnDecl->getDeclName() << ExpectedFirstParamType; 4408 4409 return false; 4410} 4411 4412static bool 4413CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4414 // C++ [basic.stc.dynamic.allocation]p1: 4415 // A program is ill-formed if an allocation function is declared in a 4416 // namespace scope other than global scope or declared static in global 4417 // scope. 4418 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4419 return true; 4420 4421 CanQualType SizeTy = 4422 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4423 4424 // C++ [basic.stc.dynamic.allocation]p1: 4425 // The return type shall be void*. The first parameter shall have type 4426 // std::size_t. 4427 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4428 SizeTy, 4429 diag::err_operator_new_dependent_param_type, 4430 diag::err_operator_new_param_type)) 4431 return true; 4432 4433 // C++ [basic.stc.dynamic.allocation]p1: 4434 // The first parameter shall not have an associated default argument. 4435 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4436 return SemaRef.Diag(FnDecl->getLocation(), 4437 diag::err_operator_new_default_arg) 4438 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4439 4440 return false; 4441} 4442 4443static bool 4444CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4445 // C++ [basic.stc.dynamic.deallocation]p1: 4446 // A program is ill-formed if deallocation functions are declared in a 4447 // namespace scope other than global scope or declared static in global 4448 // scope. 4449 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4450 return true; 4451 4452 // C++ [basic.stc.dynamic.deallocation]p2: 4453 // Each deallocation function shall return void and its first parameter 4454 // shall be void*. 4455 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4456 SemaRef.Context.VoidPtrTy, 4457 diag::err_operator_delete_dependent_param_type, 4458 diag::err_operator_delete_param_type)) 4459 return true; 4460 4461 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4462 if (FirstParamType->isDependentType()) 4463 return SemaRef.Diag(FnDecl->getLocation(), 4464 diag::err_operator_delete_dependent_param_type) 4465 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4466 4467 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4468 SemaRef.Context.VoidPtrTy) 4469 return SemaRef.Diag(FnDecl->getLocation(), 4470 diag::err_operator_delete_param_type) 4471 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4472 4473 return false; 4474} 4475 4476/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4477/// of this overloaded operator is well-formed. If so, returns false; 4478/// otherwise, emits appropriate diagnostics and returns true. 4479bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4480 assert(FnDecl && FnDecl->isOverloadedOperator() && 4481 "Expected an overloaded operator declaration"); 4482 4483 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4484 4485 // C++ [over.oper]p5: 4486 // The allocation and deallocation functions, operator new, 4487 // operator new[], operator delete and operator delete[], are 4488 // described completely in 3.7.3. The attributes and restrictions 4489 // found in the rest of this subclause do not apply to them unless 4490 // explicitly stated in 3.7.3. 4491 if (Op == OO_Delete || Op == OO_Array_Delete) 4492 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4493 4494 if (Op == OO_New || Op == OO_Array_New) 4495 return CheckOperatorNewDeclaration(*this, FnDecl); 4496 4497 // C++ [over.oper]p6: 4498 // An operator function shall either be a non-static member 4499 // function or be a non-member function and have at least one 4500 // parameter whose type is a class, a reference to a class, an 4501 // enumeration, or a reference to an enumeration. 4502 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4503 if (MethodDecl->isStatic()) 4504 return Diag(FnDecl->getLocation(), 4505 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4506 } else { 4507 bool ClassOrEnumParam = false; 4508 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4509 ParamEnd = FnDecl->param_end(); 4510 Param != ParamEnd; ++Param) { 4511 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4512 if (ParamType->isDependentType() || ParamType->isRecordType() || 4513 ParamType->isEnumeralType()) { 4514 ClassOrEnumParam = true; 4515 break; 4516 } 4517 } 4518 4519 if (!ClassOrEnumParam) 4520 return Diag(FnDecl->getLocation(), 4521 diag::err_operator_overload_needs_class_or_enum) 4522 << FnDecl->getDeclName(); 4523 } 4524 4525 // C++ [over.oper]p8: 4526 // An operator function cannot have default arguments (8.3.6), 4527 // except where explicitly stated below. 4528 // 4529 // Only the function-call operator allows default arguments 4530 // (C++ [over.call]p1). 4531 if (Op != OO_Call) { 4532 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4533 Param != FnDecl->param_end(); ++Param) { 4534 if ((*Param)->hasDefaultArg()) 4535 return Diag((*Param)->getLocation(), 4536 diag::err_operator_overload_default_arg) 4537 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4538 } 4539 } 4540 4541 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4542 { false, false, false } 4543#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4544 , { Unary, Binary, MemberOnly } 4545#include "clang/Basic/OperatorKinds.def" 4546 }; 4547 4548 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4549 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4550 bool MustBeMemberOperator = OperatorUses[Op][2]; 4551 4552 // C++ [over.oper]p8: 4553 // [...] Operator functions cannot have more or fewer parameters 4554 // than the number required for the corresponding operator, as 4555 // described in the rest of this subclause. 4556 unsigned NumParams = FnDecl->getNumParams() 4557 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4558 if (Op != OO_Call && 4559 ((NumParams == 1 && !CanBeUnaryOperator) || 4560 (NumParams == 2 && !CanBeBinaryOperator) || 4561 (NumParams < 1) || (NumParams > 2))) { 4562 // We have the wrong number of parameters. 4563 unsigned ErrorKind; 4564 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4565 ErrorKind = 2; // 2 -> unary or binary. 4566 } else if (CanBeUnaryOperator) { 4567 ErrorKind = 0; // 0 -> unary 4568 } else { 4569 assert(CanBeBinaryOperator && 4570 "All non-call overloaded operators are unary or binary!"); 4571 ErrorKind = 1; // 1 -> binary 4572 } 4573 4574 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4575 << FnDecl->getDeclName() << NumParams << ErrorKind; 4576 } 4577 4578 // Overloaded operators other than operator() cannot be variadic. 4579 if (Op != OO_Call && 4580 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4581 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4582 << FnDecl->getDeclName(); 4583 } 4584 4585 // Some operators must be non-static member functions. 4586 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4587 return Diag(FnDecl->getLocation(), 4588 diag::err_operator_overload_must_be_member) 4589 << FnDecl->getDeclName(); 4590 } 4591 4592 // C++ [over.inc]p1: 4593 // The user-defined function called operator++ implements the 4594 // prefix and postfix ++ operator. If this function is a member 4595 // function with no parameters, or a non-member function with one 4596 // parameter of class or enumeration type, it defines the prefix 4597 // increment operator ++ for objects of that type. If the function 4598 // is a member function with one parameter (which shall be of type 4599 // int) or a non-member function with two parameters (the second 4600 // of which shall be of type int), it defines the postfix 4601 // increment operator ++ for objects of that type. 4602 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4603 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4604 bool ParamIsInt = false; 4605 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4606 ParamIsInt = BT->getKind() == BuiltinType::Int; 4607 4608 if (!ParamIsInt) 4609 return Diag(LastParam->getLocation(), 4610 diag::err_operator_overload_post_incdec_must_be_int) 4611 << LastParam->getType() << (Op == OO_MinusMinus); 4612 } 4613 4614 // Notify the class if it got an assignment operator. 4615 if (Op == OO_Equal) { 4616 // Would have returned earlier otherwise. 4617 assert(isa<CXXMethodDecl>(FnDecl) && 4618 "Overloaded = not member, but not filtered."); 4619 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4620 Method->getParent()->addedAssignmentOperator(Context, Method); 4621 } 4622 4623 return false; 4624} 4625 4626/// CheckLiteralOperatorDeclaration - Check whether the declaration 4627/// of this literal operator function is well-formed. If so, returns 4628/// false; otherwise, emits appropriate diagnostics and returns true. 4629bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4630 DeclContext *DC = FnDecl->getDeclContext(); 4631 Decl::Kind Kind = DC->getDeclKind(); 4632 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4633 Kind != Decl::LinkageSpec) { 4634 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4635 << FnDecl->getDeclName(); 4636 return true; 4637 } 4638 4639 bool Valid = false; 4640 4641 // template <char...> type operator "" name() is the only valid template 4642 // signature, and the only valid signature with no parameters. 4643 if (FnDecl->param_size() == 0) { 4644 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4645 // Must have only one template parameter 4646 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4647 if (Params->size() == 1) { 4648 NonTypeTemplateParmDecl *PmDecl = 4649 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4650 4651 // The template parameter must be a char parameter pack. 4652 // FIXME: This test will always fail because non-type parameter packs 4653 // have not been implemented. 4654 if (PmDecl && PmDecl->isTemplateParameterPack() && 4655 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4656 Valid = true; 4657 } 4658 } 4659 } else { 4660 // Check the first parameter 4661 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4662 4663 QualType T = (*Param)->getType(); 4664 4665 // unsigned long long int, long double, and any character type are allowed 4666 // as the only parameters. 4667 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4668 Context.hasSameType(T, Context.LongDoubleTy) || 4669 Context.hasSameType(T, Context.CharTy) || 4670 Context.hasSameType(T, Context.WCharTy) || 4671 Context.hasSameType(T, Context.Char16Ty) || 4672 Context.hasSameType(T, Context.Char32Ty)) { 4673 if (++Param == FnDecl->param_end()) 4674 Valid = true; 4675 goto FinishedParams; 4676 } 4677 4678 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4679 const PointerType *PT = T->getAs<PointerType>(); 4680 if (!PT) 4681 goto FinishedParams; 4682 T = PT->getPointeeType(); 4683 if (!T.isConstQualified()) 4684 goto FinishedParams; 4685 T = T.getUnqualifiedType(); 4686 4687 // Move on to the second parameter; 4688 ++Param; 4689 4690 // If there is no second parameter, the first must be a const char * 4691 if (Param == FnDecl->param_end()) { 4692 if (Context.hasSameType(T, Context.CharTy)) 4693 Valid = true; 4694 goto FinishedParams; 4695 } 4696 4697 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4698 // are allowed as the first parameter to a two-parameter function 4699 if (!(Context.hasSameType(T, Context.CharTy) || 4700 Context.hasSameType(T, Context.WCharTy) || 4701 Context.hasSameType(T, Context.Char16Ty) || 4702 Context.hasSameType(T, Context.Char32Ty))) 4703 goto FinishedParams; 4704 4705 // The second and final parameter must be an std::size_t 4706 T = (*Param)->getType().getUnqualifiedType(); 4707 if (Context.hasSameType(T, Context.getSizeType()) && 4708 ++Param == FnDecl->param_end()) 4709 Valid = true; 4710 } 4711 4712 // FIXME: This diagnostic is absolutely terrible. 4713FinishedParams: 4714 if (!Valid) { 4715 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4716 << FnDecl->getDeclName(); 4717 return true; 4718 } 4719 4720 return false; 4721} 4722 4723/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4724/// linkage specification, including the language and (if present) 4725/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4726/// the location of the language string literal, which is provided 4727/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4728/// the '{' brace. Otherwise, this linkage specification does not 4729/// have any braces. 4730Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4731 SourceLocation ExternLoc, 4732 SourceLocation LangLoc, 4733 const char *Lang, 4734 unsigned StrSize, 4735 SourceLocation LBraceLoc) { 4736 LinkageSpecDecl::LanguageIDs Language; 4737 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4738 Language = LinkageSpecDecl::lang_c; 4739 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4740 Language = LinkageSpecDecl::lang_cxx; 4741 else { 4742 Diag(LangLoc, diag::err_bad_language); 4743 return DeclPtrTy(); 4744 } 4745 4746 // FIXME: Add all the various semantics of linkage specifications 4747 4748 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4749 LangLoc, Language, 4750 LBraceLoc.isValid()); 4751 CurContext->addDecl(D); 4752 PushDeclContext(S, D); 4753 return DeclPtrTy::make(D); 4754} 4755 4756/// ActOnFinishLinkageSpecification - Completely the definition of 4757/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4758/// valid, it's the position of the closing '}' brace in a linkage 4759/// specification that uses braces. 4760Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4761 DeclPtrTy LinkageSpec, 4762 SourceLocation RBraceLoc) { 4763 if (LinkageSpec) 4764 PopDeclContext(); 4765 return LinkageSpec; 4766} 4767 4768/// \brief Perform semantic analysis for the variable declaration that 4769/// occurs within a C++ catch clause, returning the newly-created 4770/// variable. 4771VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4772 TypeSourceInfo *TInfo, 4773 IdentifierInfo *Name, 4774 SourceLocation Loc, 4775 SourceRange Range) { 4776 bool Invalid = false; 4777 4778 // Arrays and functions decay. 4779 if (ExDeclType->isArrayType()) 4780 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4781 else if (ExDeclType->isFunctionType()) 4782 ExDeclType = Context.getPointerType(ExDeclType); 4783 4784 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4785 // The exception-declaration shall not denote a pointer or reference to an 4786 // incomplete type, other than [cv] void*. 4787 // N2844 forbids rvalue references. 4788 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4789 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4790 Invalid = true; 4791 } 4792 4793 // GCC allows catching pointers and references to incomplete types 4794 // as an extension; so do we, but we warn by default. 4795 4796 QualType BaseType = ExDeclType; 4797 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4798 unsigned DK = diag::err_catch_incomplete; 4799 bool IncompleteCatchIsInvalid = true; 4800 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4801 BaseType = Ptr->getPointeeType(); 4802 Mode = 1; 4803 DK = diag::ext_catch_incomplete_ptr; 4804 IncompleteCatchIsInvalid = false; 4805 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4806 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4807 BaseType = Ref->getPointeeType(); 4808 Mode = 2; 4809 DK = diag::ext_catch_incomplete_ref; 4810 IncompleteCatchIsInvalid = false; 4811 } 4812 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4813 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4814 IncompleteCatchIsInvalid) 4815 Invalid = true; 4816 4817 if (!Invalid && !ExDeclType->isDependentType() && 4818 RequireNonAbstractType(Loc, ExDeclType, 4819 diag::err_abstract_type_in_decl, 4820 AbstractVariableType)) 4821 Invalid = true; 4822 4823 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4824 Name, ExDeclType, TInfo, VarDecl::None, 4825 VarDecl::None); 4826 4827 if (!Invalid) { 4828 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4829 // C++ [except.handle]p16: 4830 // The object declared in an exception-declaration or, if the 4831 // exception-declaration does not specify a name, a temporary (12.2) is 4832 // copy-initialized (8.5) from the exception object. [...] 4833 // The object is destroyed when the handler exits, after the destruction 4834 // of any automatic objects initialized within the handler. 4835 // 4836 // We just pretend to initialize the object with itself, then make sure 4837 // it can be destroyed later. 4838 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4839 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4840 Loc, ExDeclType, 0); 4841 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4842 SourceLocation()); 4843 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4844 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4845 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4846 if (Result.isInvalid()) 4847 Invalid = true; 4848 else 4849 FinalizeVarWithDestructor(ExDecl, RecordTy); 4850 } 4851 } 4852 4853 if (Invalid) 4854 ExDecl->setInvalidDecl(); 4855 4856 return ExDecl; 4857} 4858 4859/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4860/// handler. 4861Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4862 TypeSourceInfo *TInfo = 0; 4863 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4864 4865 bool Invalid = D.isInvalidType(); 4866 IdentifierInfo *II = D.getIdentifier(); 4867 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4868 LookupOrdinaryName, 4869 ForRedeclaration)) { 4870 // The scope should be freshly made just for us. There is just no way 4871 // it contains any previous declaration. 4872 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4873 if (PrevDecl->isTemplateParameter()) { 4874 // Maybe we will complain about the shadowed template parameter. 4875 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4876 } 4877 } 4878 4879 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4880 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4881 << D.getCXXScopeSpec().getRange(); 4882 Invalid = true; 4883 } 4884 4885 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 4886 D.getIdentifier(), 4887 D.getIdentifierLoc(), 4888 D.getDeclSpec().getSourceRange()); 4889 4890 if (Invalid) 4891 ExDecl->setInvalidDecl(); 4892 4893 // Add the exception declaration into this scope. 4894 if (II) 4895 PushOnScopeChains(ExDecl, S); 4896 else 4897 CurContext->addDecl(ExDecl); 4898 4899 ProcessDeclAttributes(S, ExDecl, D); 4900 return DeclPtrTy::make(ExDecl); 4901} 4902 4903Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4904 ExprArg assertexpr, 4905 ExprArg assertmessageexpr) { 4906 Expr *AssertExpr = (Expr *)assertexpr.get(); 4907 StringLiteral *AssertMessage = 4908 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4909 4910 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4911 llvm::APSInt Value(32); 4912 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4913 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4914 AssertExpr->getSourceRange(); 4915 return DeclPtrTy(); 4916 } 4917 4918 if (Value == 0) { 4919 Diag(AssertLoc, diag::err_static_assert_failed) 4920 << AssertMessage->getString() << AssertExpr->getSourceRange(); 4921 } 4922 } 4923 4924 assertexpr.release(); 4925 assertmessageexpr.release(); 4926 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4927 AssertExpr, AssertMessage); 4928 4929 CurContext->addDecl(Decl); 4930 return DeclPtrTy::make(Decl); 4931} 4932 4933/// \brief Perform semantic analysis of the given friend type declaration. 4934/// 4935/// \returns A friend declaration that. 4936FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 4937 TypeSourceInfo *TSInfo) { 4938 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 4939 4940 QualType T = TSInfo->getType(); 4941 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 4942 4943 if (!getLangOptions().CPlusPlus0x) { 4944 // C++03 [class.friend]p2: 4945 // An elaborated-type-specifier shall be used in a friend declaration 4946 // for a class.* 4947 // 4948 // * The class-key of the elaborated-type-specifier is required. 4949 if (!ActiveTemplateInstantiations.empty()) { 4950 // Do not complain about the form of friend template types during 4951 // template instantiation; we will already have complained when the 4952 // template was declared. 4953 } else if (!T->isElaboratedTypeSpecifier()) { 4954 // If we evaluated the type to a record type, suggest putting 4955 // a tag in front. 4956 if (const RecordType *RT = T->getAs<RecordType>()) { 4957 RecordDecl *RD = RT->getDecl(); 4958 4959 std::string InsertionText = std::string(" ") + RD->getKindName(); 4960 4961 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 4962 << (unsigned) RD->getTagKind() 4963 << T 4964 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 4965 InsertionText); 4966 } else { 4967 Diag(FriendLoc, diag::ext_nonclass_type_friend) 4968 << T 4969 << SourceRange(FriendLoc, TypeRange.getEnd()); 4970 } 4971 } else if (T->getAs<EnumType>()) { 4972 Diag(FriendLoc, diag::ext_enum_friend) 4973 << T 4974 << SourceRange(FriendLoc, TypeRange.getEnd()); 4975 } 4976 } 4977 4978 // C++0x [class.friend]p3: 4979 // If the type specifier in a friend declaration designates a (possibly 4980 // cv-qualified) class type, that class is declared as a friend; otherwise, 4981 // the friend declaration is ignored. 4982 4983 // FIXME: C++0x has some syntactic restrictions on friend type declarations 4984 // in [class.friend]p3 that we do not implement. 4985 4986 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 4987} 4988 4989/// Handle a friend type declaration. This works in tandem with 4990/// ActOnTag. 4991/// 4992/// Notes on friend class templates: 4993/// 4994/// We generally treat friend class declarations as if they were 4995/// declaring a class. So, for example, the elaborated type specifier 4996/// in a friend declaration is required to obey the restrictions of a 4997/// class-head (i.e. no typedefs in the scope chain), template 4998/// parameters are required to match up with simple template-ids, &c. 4999/// However, unlike when declaring a template specialization, it's 5000/// okay to refer to a template specialization without an empty 5001/// template parameter declaration, e.g. 5002/// friend class A<T>::B<unsigned>; 5003/// We permit this as a special case; if there are any template 5004/// parameters present at all, require proper matching, i.e. 5005/// template <> template <class T> friend class A<int>::B; 5006Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5007 MultiTemplateParamsArg TempParams) { 5008 SourceLocation Loc = DS.getSourceRange().getBegin(); 5009 5010 assert(DS.isFriendSpecified()); 5011 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5012 5013 // Try to convert the decl specifier to a type. This works for 5014 // friend templates because ActOnTag never produces a ClassTemplateDecl 5015 // for a TUK_Friend. 5016 Declarator TheDeclarator(DS, Declarator::MemberContext); 5017 TypeSourceInfo *TSI; 5018 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5019 if (TheDeclarator.isInvalidType()) 5020 return DeclPtrTy(); 5021 5022 if (!TSI) 5023 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5024 5025 // This is definitely an error in C++98. It's probably meant to 5026 // be forbidden in C++0x, too, but the specification is just 5027 // poorly written. 5028 // 5029 // The problem is with declarations like the following: 5030 // template <T> friend A<T>::foo; 5031 // where deciding whether a class C is a friend or not now hinges 5032 // on whether there exists an instantiation of A that causes 5033 // 'foo' to equal C. There are restrictions on class-heads 5034 // (which we declare (by fiat) elaborated friend declarations to 5035 // be) that makes this tractable. 5036 // 5037 // FIXME: handle "template <> friend class A<T>;", which 5038 // is possibly well-formed? Who even knows? 5039 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5040 Diag(Loc, diag::err_tagless_friend_type_template) 5041 << DS.getSourceRange(); 5042 return DeclPtrTy(); 5043 } 5044 5045 // C++98 [class.friend]p1: A friend of a class is a function 5046 // or class that is not a member of the class . . . 5047 // This is fixed in DR77, which just barely didn't make the C++03 5048 // deadline. It's also a very silly restriction that seriously 5049 // affects inner classes and which nobody else seems to implement; 5050 // thus we never diagnose it, not even in -pedantic. 5051 // 5052 // But note that we could warn about it: it's always useless to 5053 // friend one of your own members (it's not, however, worthless to 5054 // friend a member of an arbitrary specialization of your template). 5055 5056 Decl *D; 5057 if (unsigned NumTempParamLists = TempParams.size()) 5058 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5059 NumTempParamLists, 5060 (TemplateParameterList**) TempParams.release(), 5061 TSI, 5062 DS.getFriendSpecLoc()); 5063 else 5064 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5065 5066 if (!D) 5067 return DeclPtrTy(); 5068 5069 D->setAccess(AS_public); 5070 CurContext->addDecl(D); 5071 5072 return DeclPtrTy::make(D); 5073} 5074 5075Sema::DeclPtrTy 5076Sema::ActOnFriendFunctionDecl(Scope *S, 5077 Declarator &D, 5078 bool IsDefinition, 5079 MultiTemplateParamsArg TemplateParams) { 5080 const DeclSpec &DS = D.getDeclSpec(); 5081 5082 assert(DS.isFriendSpecified()); 5083 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5084 5085 SourceLocation Loc = D.getIdentifierLoc(); 5086 TypeSourceInfo *TInfo = 0; 5087 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5088 5089 // C++ [class.friend]p1 5090 // A friend of a class is a function or class.... 5091 // Note that this sees through typedefs, which is intended. 5092 // It *doesn't* see through dependent types, which is correct 5093 // according to [temp.arg.type]p3: 5094 // If a declaration acquires a function type through a 5095 // type dependent on a template-parameter and this causes 5096 // a declaration that does not use the syntactic form of a 5097 // function declarator to have a function type, the program 5098 // is ill-formed. 5099 if (!T->isFunctionType()) { 5100 Diag(Loc, diag::err_unexpected_friend); 5101 5102 // It might be worthwhile to try to recover by creating an 5103 // appropriate declaration. 5104 return DeclPtrTy(); 5105 } 5106 5107 // C++ [namespace.memdef]p3 5108 // - If a friend declaration in a non-local class first declares a 5109 // class or function, the friend class or function is a member 5110 // of the innermost enclosing namespace. 5111 // - The name of the friend is not found by simple name lookup 5112 // until a matching declaration is provided in that namespace 5113 // scope (either before or after the class declaration granting 5114 // friendship). 5115 // - If a friend function is called, its name may be found by the 5116 // name lookup that considers functions from namespaces and 5117 // classes associated with the types of the function arguments. 5118 // - When looking for a prior declaration of a class or a function 5119 // declared as a friend, scopes outside the innermost enclosing 5120 // namespace scope are not considered. 5121 5122 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5123 DeclarationName Name = GetNameForDeclarator(D); 5124 assert(Name); 5125 5126 // The context we found the declaration in, or in which we should 5127 // create the declaration. 5128 DeclContext *DC; 5129 5130 // FIXME: handle local classes 5131 5132 // Recover from invalid scope qualifiers as if they just weren't there. 5133 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5134 ForRedeclaration); 5135 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5136 // FIXME: RequireCompleteDeclContext 5137 DC = computeDeclContext(ScopeQual); 5138 5139 // FIXME: handle dependent contexts 5140 if (!DC) return DeclPtrTy(); 5141 5142 LookupQualifiedName(Previous, DC); 5143 5144 // If searching in that context implicitly found a declaration in 5145 // a different context, treat it like it wasn't found at all. 5146 // TODO: better diagnostics for this case. Suggesting the right 5147 // qualified scope would be nice... 5148 // FIXME: getRepresentativeDecl() is not right here at all 5149 if (Previous.empty() || 5150 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5151 D.setInvalidType(); 5152 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5153 return DeclPtrTy(); 5154 } 5155 5156 // C++ [class.friend]p1: A friend of a class is a function or 5157 // class that is not a member of the class . . . 5158 if (DC->Equals(CurContext)) 5159 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5160 5161 // Otherwise walk out to the nearest namespace scope looking for matches. 5162 } else { 5163 // TODO: handle local class contexts. 5164 5165 DC = CurContext; 5166 while (true) { 5167 // Skip class contexts. If someone can cite chapter and verse 5168 // for this behavior, that would be nice --- it's what GCC and 5169 // EDG do, and it seems like a reasonable intent, but the spec 5170 // really only says that checks for unqualified existing 5171 // declarations should stop at the nearest enclosing namespace, 5172 // not that they should only consider the nearest enclosing 5173 // namespace. 5174 while (DC->isRecord()) 5175 DC = DC->getParent(); 5176 5177 LookupQualifiedName(Previous, DC); 5178 5179 // TODO: decide what we think about using declarations. 5180 if (!Previous.empty()) 5181 break; 5182 5183 if (DC->isFileContext()) break; 5184 DC = DC->getParent(); 5185 } 5186 5187 // C++ [class.friend]p1: A friend of a class is a function or 5188 // class that is not a member of the class . . . 5189 // C++0x changes this for both friend types and functions. 5190 // Most C++ 98 compilers do seem to give an error here, so 5191 // we do, too. 5192 if (!Previous.empty() && DC->Equals(CurContext) 5193 && !getLangOptions().CPlusPlus0x) 5194 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5195 } 5196 5197 if (DC->isFileContext()) { 5198 // This implies that it has to be an operator or function. 5199 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5200 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5201 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5202 Diag(Loc, diag::err_introducing_special_friend) << 5203 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5204 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5205 return DeclPtrTy(); 5206 } 5207 } 5208 5209 bool Redeclaration = false; 5210 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5211 move(TemplateParams), 5212 IsDefinition, 5213 Redeclaration); 5214 if (!ND) return DeclPtrTy(); 5215 5216 assert(ND->getDeclContext() == DC); 5217 assert(ND->getLexicalDeclContext() == CurContext); 5218 5219 // Add the function declaration to the appropriate lookup tables, 5220 // adjusting the redeclarations list as necessary. We don't 5221 // want to do this yet if the friending class is dependent. 5222 // 5223 // Also update the scope-based lookup if the target context's 5224 // lookup context is in lexical scope. 5225 if (!CurContext->isDependentContext()) { 5226 DC = DC->getLookupContext(); 5227 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5228 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5229 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5230 } 5231 5232 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5233 D.getIdentifierLoc(), ND, 5234 DS.getFriendSpecLoc()); 5235 FrD->setAccess(AS_public); 5236 CurContext->addDecl(FrD); 5237 5238 return DeclPtrTy::make(ND); 5239} 5240 5241void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5242 AdjustDeclIfTemplate(dcl); 5243 5244 Decl *Dcl = dcl.getAs<Decl>(); 5245 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5246 if (!Fn) { 5247 Diag(DelLoc, diag::err_deleted_non_function); 5248 return; 5249 } 5250 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5251 Diag(DelLoc, diag::err_deleted_decl_not_first); 5252 Diag(Prev->getLocation(), diag::note_previous_declaration); 5253 // If the declaration wasn't the first, we delete the function anyway for 5254 // recovery. 5255 } 5256 Fn->setDeleted(); 5257} 5258 5259static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5260 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5261 ++CI) { 5262 Stmt *SubStmt = *CI; 5263 if (!SubStmt) 5264 continue; 5265 if (isa<ReturnStmt>(SubStmt)) 5266 Self.Diag(SubStmt->getSourceRange().getBegin(), 5267 diag::err_return_in_constructor_handler); 5268 if (!isa<Expr>(SubStmt)) 5269 SearchForReturnInStmt(Self, SubStmt); 5270 } 5271} 5272 5273void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5274 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5275 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5276 SearchForReturnInStmt(*this, Handler); 5277 } 5278} 5279 5280bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5281 const CXXMethodDecl *Old) { 5282 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5283 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5284 5285 if (Context.hasSameType(NewTy, OldTy) || 5286 NewTy->isDependentType() || OldTy->isDependentType()) 5287 return false; 5288 5289 // Check if the return types are covariant 5290 QualType NewClassTy, OldClassTy; 5291 5292 /// Both types must be pointers or references to classes. 5293 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5294 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5295 NewClassTy = NewPT->getPointeeType(); 5296 OldClassTy = OldPT->getPointeeType(); 5297 } 5298 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5299 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5300 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5301 NewClassTy = NewRT->getPointeeType(); 5302 OldClassTy = OldRT->getPointeeType(); 5303 } 5304 } 5305 } 5306 5307 // The return types aren't either both pointers or references to a class type. 5308 if (NewClassTy.isNull()) { 5309 Diag(New->getLocation(), 5310 diag::err_different_return_type_for_overriding_virtual_function) 5311 << New->getDeclName() << NewTy << OldTy; 5312 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5313 5314 return true; 5315 } 5316 5317 // C++ [class.virtual]p6: 5318 // If the return type of D::f differs from the return type of B::f, the 5319 // class type in the return type of D::f shall be complete at the point of 5320 // declaration of D::f or shall be the class type D. 5321 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5322 if (!RT->isBeingDefined() && 5323 RequireCompleteType(New->getLocation(), NewClassTy, 5324 PDiag(diag::err_covariant_return_incomplete) 5325 << New->getDeclName())) 5326 return true; 5327 } 5328 5329 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5330 // Check if the new class derives from the old class. 5331 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5332 Diag(New->getLocation(), 5333 diag::err_covariant_return_not_derived) 5334 << New->getDeclName() << NewTy << OldTy; 5335 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5336 return true; 5337 } 5338 5339 // Check if we the conversion from derived to base is valid. 5340 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5341 diag::err_covariant_return_inaccessible_base, 5342 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5343 // FIXME: Should this point to the return type? 5344 New->getLocation(), SourceRange(), New->getDeclName())) { 5345 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5346 return true; 5347 } 5348 } 5349 5350 // The qualifiers of the return types must be the same. 5351 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5352 Diag(New->getLocation(), 5353 diag::err_covariant_return_type_different_qualifications) 5354 << New->getDeclName() << NewTy << OldTy; 5355 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5356 return true; 5357 }; 5358 5359 5360 // The new class type must have the same or less qualifiers as the old type. 5361 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5362 Diag(New->getLocation(), 5363 diag::err_covariant_return_type_class_type_more_qualified) 5364 << New->getDeclName() << NewTy << OldTy; 5365 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5366 return true; 5367 }; 5368 5369 return false; 5370} 5371 5372bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5373 const CXXMethodDecl *Old) 5374{ 5375 if (Old->hasAttr<FinalAttr>()) { 5376 Diag(New->getLocation(), diag::err_final_function_overridden) 5377 << New->getDeclName(); 5378 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5379 return true; 5380 } 5381 5382 return false; 5383} 5384 5385/// \brief Mark the given method pure. 5386/// 5387/// \param Method the method to be marked pure. 5388/// 5389/// \param InitRange the source range that covers the "0" initializer. 5390bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5391 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5392 Method->setPure(); 5393 5394 // A class is abstract if at least one function is pure virtual. 5395 Method->getParent()->setAbstract(true); 5396 return false; 5397 } 5398 5399 if (!Method->isInvalidDecl()) 5400 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5401 << Method->getDeclName() << InitRange; 5402 return true; 5403} 5404 5405/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5406/// an initializer for the out-of-line declaration 'Dcl'. The scope 5407/// is a fresh scope pushed for just this purpose. 5408/// 5409/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5410/// static data member of class X, names should be looked up in the scope of 5411/// class X. 5412void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5413 // If there is no declaration, there was an error parsing it. 5414 Decl *D = Dcl.getAs<Decl>(); 5415 if (D == 0) return; 5416 5417 // We should only get called for declarations with scope specifiers, like: 5418 // int foo::bar; 5419 assert(D->isOutOfLine()); 5420 EnterDeclaratorContext(S, D->getDeclContext()); 5421} 5422 5423/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5424/// initializer for the out-of-line declaration 'Dcl'. 5425void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5426 // If there is no declaration, there was an error parsing it. 5427 Decl *D = Dcl.getAs<Decl>(); 5428 if (D == 0) return; 5429 5430 assert(D->isOutOfLine()); 5431 ExitDeclaratorContext(S); 5432} 5433 5434/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5435/// C++ if/switch/while/for statement. 5436/// e.g: "if (int x = f()) {...}" 5437Action::DeclResult 5438Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5439 // C++ 6.4p2: 5440 // The declarator shall not specify a function or an array. 5441 // The type-specifier-seq shall not contain typedef and shall not declare a 5442 // new class or enumeration. 5443 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5444 "Parser allowed 'typedef' as storage class of condition decl."); 5445 5446 TypeSourceInfo *TInfo = 0; 5447 TagDecl *OwnedTag = 0; 5448 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5449 5450 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5451 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5452 // would be created and CXXConditionDeclExpr wants a VarDecl. 5453 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5454 << D.getSourceRange(); 5455 return DeclResult(); 5456 } else if (OwnedTag && OwnedTag->isDefinition()) { 5457 // The type-specifier-seq shall not declare a new class or enumeration. 5458 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5459 } 5460 5461 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5462 if (!Dcl) 5463 return DeclResult(); 5464 5465 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5466 VD->setDeclaredInCondition(true); 5467 return Dcl; 5468} 5469 5470static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5471 // Ignore dependent types. 5472 if (MD->isDependentContext()) 5473 return false; 5474 5475 // Ignore declarations that are not definitions. 5476 if (!MD->isThisDeclarationADefinition()) 5477 return false; 5478 5479 CXXRecordDecl *RD = MD->getParent(); 5480 5481 // Ignore classes without a vtable. 5482 if (!RD->isDynamicClass()) 5483 return false; 5484 5485 switch (MD->getParent()->getTemplateSpecializationKind()) { 5486 case TSK_Undeclared: 5487 case TSK_ExplicitSpecialization: 5488 // Classes that aren't instantiations of templates don't need their 5489 // virtual methods marked until we see the definition of the key 5490 // function. 5491 break; 5492 5493 case TSK_ImplicitInstantiation: 5494 // This is a constructor of a class template; mark all of the virtual 5495 // members as referenced to ensure that they get instantiatied. 5496 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5497 return true; 5498 break; 5499 5500 case TSK_ExplicitInstantiationDeclaration: 5501 return false; 5502 5503 case TSK_ExplicitInstantiationDefinition: 5504 // This is method of a explicit instantiation; mark all of the virtual 5505 // members as referenced to ensure that they get instantiatied. 5506 return true; 5507 } 5508 5509 // Consider only out-of-line definitions of member functions. When we see 5510 // an inline definition, it's too early to compute the key function. 5511 if (!MD->isOutOfLine()) 5512 return false; 5513 5514 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5515 5516 // If there is no key function, we will need a copy of the vtable. 5517 if (!KeyFunction) 5518 return true; 5519 5520 // If this is the key function, we need to mark virtual members. 5521 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5522 return true; 5523 5524 return false; 5525} 5526 5527void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5528 CXXMethodDecl *MD) { 5529 CXXRecordDecl *RD = MD->getParent(); 5530 5531 // We will need to mark all of the virtual members as referenced to build the 5532 // vtable. 5533 if (!needsVTable(MD, Context)) 5534 return; 5535 5536 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5537 if (kind == TSK_ImplicitInstantiation) 5538 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5539 else 5540 MarkVirtualMembersReferenced(Loc, RD); 5541} 5542 5543bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5544 if (ClassesWithUnmarkedVirtualMembers.empty()) 5545 return false; 5546 5547 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5548 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5549 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5550 ClassesWithUnmarkedVirtualMembers.pop_back(); 5551 MarkVirtualMembersReferenced(Loc, RD); 5552 } 5553 5554 return true; 5555} 5556 5557void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5558 const CXXRecordDecl *RD) { 5559 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5560 e = RD->method_end(); i != e; ++i) { 5561 CXXMethodDecl *MD = *i; 5562 5563 // C++ [basic.def.odr]p2: 5564 // [...] A virtual member function is used if it is not pure. [...] 5565 if (MD->isVirtual() && !MD->isPure()) 5566 MarkDeclarationReferenced(Loc, MD); 5567 } 5568 5569 // Only classes that have virtual bases need a VTT. 5570 if (RD->getNumVBases() == 0) 5571 return; 5572 5573 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5574 e = RD->bases_end(); i != e; ++i) { 5575 const CXXRecordDecl *Base = 5576 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5577 if (i->isVirtual()) 5578 continue; 5579 if (Base->getNumVBases() == 0) 5580 continue; 5581 MarkVirtualMembersReferenced(Loc, Base); 5582 } 5583} 5584