SemaDeclCXX.cpp revision ea356fb65cc844abeab1176f6333a86b69644735
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 const CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1080 bool NotUnknownSpecialization = false; 1081 DeclContext *DC = computeDeclContext(SS, false); 1082 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1083 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1084 1085 if (!NotUnknownSpecialization) { 1086 // When the scope specifier can refer to a member of an unknown 1087 // specialization, we take it as a type name. 1088 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1089 *MemberOrBase, SS.getRange()); 1090 if (BaseType.isNull()) 1091 return true; 1092 1093 R.clear(); 1094 } 1095 } 1096 1097 // If no results were found, try to correct typos. 1098 if (R.empty() && BaseType.isNull() && 1099 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1100 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1101 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1102 // We have found a non-static data member with a similar 1103 // name to what was typed; complain and initialize that 1104 // member. 1105 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1106 << MemberOrBase << true << R.getLookupName() 1107 << FixItHint::CreateReplacement(R.getNameLoc(), 1108 R.getLookupName().getAsString()); 1109 Diag(Member->getLocation(), diag::note_previous_decl) 1110 << Member->getDeclName(); 1111 1112 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1113 LParenLoc, RParenLoc); 1114 } 1115 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1116 const CXXBaseSpecifier *DirectBaseSpec; 1117 const CXXBaseSpecifier *VirtualBaseSpec; 1118 if (FindBaseInitializer(*this, ClassDecl, 1119 Context.getTypeDeclType(Type), 1120 DirectBaseSpec, VirtualBaseSpec)) { 1121 // We have found a direct or virtual base class with a 1122 // similar name to what was typed; complain and initialize 1123 // that base class. 1124 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1125 << MemberOrBase << false << R.getLookupName() 1126 << FixItHint::CreateReplacement(R.getNameLoc(), 1127 R.getLookupName().getAsString()); 1128 1129 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1130 : VirtualBaseSpec; 1131 Diag(BaseSpec->getSourceRange().getBegin(), 1132 diag::note_base_class_specified_here) 1133 << BaseSpec->getType() 1134 << BaseSpec->getSourceRange(); 1135 1136 TyD = Type; 1137 } 1138 } 1139 } 1140 1141 if (!TyD && BaseType.isNull()) { 1142 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1143 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1144 return true; 1145 } 1146 } 1147 1148 if (BaseType.isNull()) { 1149 BaseType = Context.getTypeDeclType(TyD); 1150 if (SS.isSet()) { 1151 NestedNameSpecifier *Qualifier = 1152 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1153 1154 // FIXME: preserve source range information 1155 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1156 } 1157 } 1158 } 1159 1160 if (!TInfo) 1161 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1162 1163 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1164 LParenLoc, RParenLoc, ClassDecl); 1165} 1166 1167/// Checks an initializer expression for use of uninitialized fields, such as 1168/// containing the field that is being initialized. Returns true if there is an 1169/// uninitialized field was used an updates the SourceLocation parameter; false 1170/// otherwise. 1171static bool InitExprContainsUninitializedFields(const Stmt* S, 1172 const FieldDecl* LhsField, 1173 SourceLocation* L) { 1174 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1175 if (ME) { 1176 const NamedDecl* RhsField = ME->getMemberDecl(); 1177 if (RhsField == LhsField) { 1178 // Initializing a field with itself. Throw a warning. 1179 // But wait; there are exceptions! 1180 // Exception #1: The field may not belong to this record. 1181 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1182 const Expr* base = ME->getBase(); 1183 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1184 // Even though the field matches, it does not belong to this record. 1185 return false; 1186 } 1187 // None of the exceptions triggered; return true to indicate an 1188 // uninitialized field was used. 1189 *L = ME->getMemberLoc(); 1190 return true; 1191 } 1192 } 1193 bool found = false; 1194 for (Stmt::const_child_iterator it = S->child_begin(); 1195 it != S->child_end() && found == false; 1196 ++it) { 1197 if (isa<CallExpr>(S)) { 1198 // Do not descend into function calls or constructors, as the use 1199 // of an uninitialized field may be valid. One would have to inspect 1200 // the contents of the function/ctor to determine if it is safe or not. 1201 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1202 // may be safe, depending on what the function/ctor does. 1203 continue; 1204 } 1205 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1206 } 1207 return found; 1208} 1209 1210Sema::MemInitResult 1211Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1212 unsigned NumArgs, SourceLocation IdLoc, 1213 SourceLocation LParenLoc, 1214 SourceLocation RParenLoc) { 1215 // Diagnose value-uses of fields to initialize themselves, e.g. 1216 // foo(foo) 1217 // where foo is not also a parameter to the constructor. 1218 // TODO: implement -Wuninitialized and fold this into that framework. 1219 for (unsigned i = 0; i < NumArgs; ++i) { 1220 SourceLocation L; 1221 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1222 // FIXME: Return true in the case when other fields are used before being 1223 // uninitialized. For example, let this field be the i'th field. When 1224 // initializing the i'th field, throw a warning if any of the >= i'th 1225 // fields are used, as they are not yet initialized. 1226 // Right now we are only handling the case where the i'th field uses 1227 // itself in its initializer. 1228 Diag(L, diag::warn_field_is_uninit); 1229 } 1230 } 1231 1232 bool HasDependentArg = false; 1233 for (unsigned i = 0; i < NumArgs; i++) 1234 HasDependentArg |= Args[i]->isTypeDependent(); 1235 1236 QualType FieldType = Member->getType(); 1237 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1238 FieldType = Array->getElementType(); 1239 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1240 if (FieldType->isDependentType() || HasDependentArg) { 1241 // Can't check initialization for a member of dependent type or when 1242 // any of the arguments are type-dependent expressions. 1243 OwningExprResult Init 1244 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1245 RParenLoc)); 1246 1247 // Erase any temporaries within this evaluation context; we're not 1248 // going to track them in the AST, since we'll be rebuilding the 1249 // ASTs during template instantiation. 1250 ExprTemporaries.erase( 1251 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1252 ExprTemporaries.end()); 1253 1254 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1255 LParenLoc, 1256 Init.takeAs<Expr>(), 1257 RParenLoc); 1258 1259 } 1260 1261 if (Member->isInvalidDecl()) 1262 return true; 1263 1264 // Initialize the member. 1265 InitializedEntity MemberEntity = 1266 InitializedEntity::InitializeMember(Member, 0); 1267 InitializationKind Kind = 1268 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1269 1270 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1271 1272 OwningExprResult MemberInit = 1273 InitSeq.Perform(*this, MemberEntity, Kind, 1274 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1275 if (MemberInit.isInvalid()) 1276 return true; 1277 1278 // C++0x [class.base.init]p7: 1279 // The initialization of each base and member constitutes a 1280 // full-expression. 1281 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1282 if (MemberInit.isInvalid()) 1283 return true; 1284 1285 // If we are in a dependent context, template instantiation will 1286 // perform this type-checking again. Just save the arguments that we 1287 // received in a ParenListExpr. 1288 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1289 // of the information that we have about the member 1290 // initializer. However, deconstructing the ASTs is a dicey process, 1291 // and this approach is far more likely to get the corner cases right. 1292 if (CurContext->isDependentContext()) { 1293 // Bump the reference count of all of the arguments. 1294 for (unsigned I = 0; I != NumArgs; ++I) 1295 Args[I]->Retain(); 1296 1297 OwningExprResult Init 1298 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1299 RParenLoc)); 1300 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1301 LParenLoc, 1302 Init.takeAs<Expr>(), 1303 RParenLoc); 1304 } 1305 1306 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1307 LParenLoc, 1308 MemberInit.takeAs<Expr>(), 1309 RParenLoc); 1310} 1311 1312Sema::MemInitResult 1313Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1314 Expr **Args, unsigned NumArgs, 1315 SourceLocation LParenLoc, SourceLocation RParenLoc, 1316 CXXRecordDecl *ClassDecl) { 1317 bool HasDependentArg = false; 1318 for (unsigned i = 0; i < NumArgs; i++) 1319 HasDependentArg |= Args[i]->isTypeDependent(); 1320 1321 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1322 if (BaseType->isDependentType() || HasDependentArg) { 1323 // Can't check initialization for a base of dependent type or when 1324 // any of the arguments are type-dependent expressions. 1325 OwningExprResult BaseInit 1326 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1327 RParenLoc)); 1328 1329 // Erase any temporaries within this evaluation context; we're not 1330 // going to track them in the AST, since we'll be rebuilding the 1331 // ASTs during template instantiation. 1332 ExprTemporaries.erase( 1333 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1334 ExprTemporaries.end()); 1335 1336 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1337 LParenLoc, 1338 BaseInit.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 if (!BaseType->isRecordType()) 1343 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1344 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1345 1346 // C++ [class.base.init]p2: 1347 // [...] Unless the mem-initializer-id names a nonstatic data 1348 // member of the constructor’s class or a direct or virtual base 1349 // of that class, the mem-initializer is ill-formed. A 1350 // mem-initializer-list can initialize a base class using any 1351 // name that denotes that base class type. 1352 1353 // Check for direct and virtual base classes. 1354 const CXXBaseSpecifier *DirectBaseSpec = 0; 1355 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1356 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1357 VirtualBaseSpec); 1358 1359 // C++ [base.class.init]p2: 1360 // If a mem-initializer-id is ambiguous because it designates both 1361 // a direct non-virtual base class and an inherited virtual base 1362 // class, the mem-initializer is ill-formed. 1363 if (DirectBaseSpec && VirtualBaseSpec) 1364 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1365 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1366 // C++ [base.class.init]p2: 1367 // Unless the mem-initializer-id names a nonstatic data membeer of the 1368 // constructor's class ot a direst or virtual base of that class, the 1369 // mem-initializer is ill-formed. 1370 if (!DirectBaseSpec && !VirtualBaseSpec) 1371 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1372 << BaseType << ClassDecl->getNameAsCString() 1373 << BaseTInfo->getTypeLoc().getSourceRange(); 1374 1375 CXXBaseSpecifier *BaseSpec 1376 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1377 if (!BaseSpec) 1378 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1379 1380 // Initialize the base. 1381 InitializedEntity BaseEntity = 1382 InitializedEntity::InitializeBase(Context, BaseSpec); 1383 InitializationKind Kind = 1384 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1385 1386 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1387 1388 OwningExprResult BaseInit = 1389 InitSeq.Perform(*this, BaseEntity, Kind, 1390 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1391 if (BaseInit.isInvalid()) 1392 return true; 1393 1394 // C++0x [class.base.init]p7: 1395 // The initialization of each base and member constitutes a 1396 // full-expression. 1397 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1398 if (BaseInit.isInvalid()) 1399 return true; 1400 1401 // If we are in a dependent context, template instantiation will 1402 // perform this type-checking again. Just save the arguments that we 1403 // received in a ParenListExpr. 1404 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1405 // of the information that we have about the base 1406 // initializer. However, deconstructing the ASTs is a dicey process, 1407 // and this approach is far more likely to get the corner cases right. 1408 if (CurContext->isDependentContext()) { 1409 // Bump the reference count of all of the arguments. 1410 for (unsigned I = 0; I != NumArgs; ++I) 1411 Args[I]->Retain(); 1412 1413 OwningExprResult Init 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1417 LParenLoc, 1418 Init.takeAs<Expr>(), 1419 RParenLoc); 1420 } 1421 1422 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1423 LParenLoc, 1424 BaseInit.takeAs<Expr>(), 1425 RParenLoc); 1426} 1427 1428bool 1429Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1430 CXXBaseOrMemberInitializer **Initializers, 1431 unsigned NumInitializers, 1432 bool AnyErrors) { 1433 // We need to build the initializer AST according to order of construction 1434 // and not what user specified in the Initializers list. 1435 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1436 if (!ClassDecl) 1437 return true; 1438 1439 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1440 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1441 bool HasDependentBaseInit = false; 1442 bool HadError = false; 1443 1444 for (unsigned i = 0; i < NumInitializers; i++) { 1445 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1446 if (Member->isBaseInitializer()) { 1447 if (Member->getBaseClass()->isDependentType()) 1448 HasDependentBaseInit = true; 1449 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1450 } else { 1451 AllBaseFields[Member->getMember()] = Member; 1452 } 1453 } 1454 1455 if (HasDependentBaseInit) { 1456 // FIXME. This does not preserve the ordering of the initializers. 1457 // Try (with -Wreorder) 1458 // template<class X> struct A {}; 1459 // template<class X> struct B : A<X> { 1460 // B() : x1(10), A<X>() {} 1461 // int x1; 1462 // }; 1463 // B<int> x; 1464 // On seeing one dependent type, we should essentially exit this routine 1465 // while preserving user-declared initializer list. When this routine is 1466 // called during instantiatiation process, this routine will rebuild the 1467 // ordered initializer list correctly. 1468 1469 // If we have a dependent base initialization, we can't determine the 1470 // association between initializers and bases; just dump the known 1471 // initializers into the list, and don't try to deal with other bases. 1472 for (unsigned i = 0; i < NumInitializers; i++) { 1473 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1474 if (Member->isBaseInitializer()) 1475 AllToInit.push_back(Member); 1476 } 1477 } else { 1478 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1479 1480 // Push virtual bases before others. 1481 for (CXXRecordDecl::base_class_iterator VBase = 1482 ClassDecl->vbases_begin(), 1483 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1484 if (VBase->getType()->isDependentType()) 1485 continue; 1486 if (CXXBaseOrMemberInitializer *Value 1487 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1488 AllToInit.push_back(Value); 1489 } else if (!AnyErrors) { 1490 InitializedEntity InitEntity 1491 = InitializedEntity::InitializeBase(Context, VBase); 1492 InitializationKind InitKind 1493 = InitializationKind::CreateDefault(Constructor->getLocation()); 1494 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1495 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1496 MultiExprArg(*this, 0, 0)); 1497 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1498 if (BaseInit.isInvalid()) { 1499 HadError = true; 1500 continue; 1501 } 1502 1503 // Don't attach synthesized base initializers in a dependent 1504 // context; they'll be checked again at template instantiation 1505 // time. 1506 if (CurContext->isDependentContext()) 1507 continue; 1508 1509 CXXBaseOrMemberInitializer *CXXBaseInit = 1510 new (Context) CXXBaseOrMemberInitializer(Context, 1511 Context.getTrivialTypeSourceInfo(VBase->getType(), 1512 SourceLocation()), 1513 SourceLocation(), 1514 BaseInit.takeAs<Expr>(), 1515 SourceLocation()); 1516 AllToInit.push_back(CXXBaseInit); 1517 } 1518 } 1519 1520 for (CXXRecordDecl::base_class_iterator Base = 1521 ClassDecl->bases_begin(), 1522 E = ClassDecl->bases_end(); Base != E; ++Base) { 1523 // Virtuals are in the virtual base list and already constructed. 1524 if (Base->isVirtual()) 1525 continue; 1526 // Skip dependent types. 1527 if (Base->getType()->isDependentType()) 1528 continue; 1529 if (CXXBaseOrMemberInitializer *Value 1530 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1531 AllToInit.push_back(Value); 1532 } 1533 else if (!AnyErrors) { 1534 InitializedEntity InitEntity 1535 = InitializedEntity::InitializeBase(Context, Base); 1536 InitializationKind InitKind 1537 = InitializationKind::CreateDefault(Constructor->getLocation()); 1538 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1539 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1540 MultiExprArg(*this, 0, 0)); 1541 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1542 if (BaseInit.isInvalid()) { 1543 HadError = true; 1544 continue; 1545 } 1546 1547 // Don't attach synthesized base initializers in a dependent 1548 // context; they'll be regenerated at template instantiation 1549 // time. 1550 if (CurContext->isDependentContext()) 1551 continue; 1552 1553 CXXBaseOrMemberInitializer *CXXBaseInit = 1554 new (Context) CXXBaseOrMemberInitializer(Context, 1555 Context.getTrivialTypeSourceInfo(Base->getType(), 1556 SourceLocation()), 1557 SourceLocation(), 1558 BaseInit.takeAs<Expr>(), 1559 SourceLocation()); 1560 AllToInit.push_back(CXXBaseInit); 1561 } 1562 } 1563 } 1564 1565 // non-static data members. 1566 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1567 E = ClassDecl->field_end(); Field != E; ++Field) { 1568 if ((*Field)->isAnonymousStructOrUnion()) { 1569 if (const RecordType *FieldClassType = 1570 Field->getType()->getAs<RecordType>()) { 1571 CXXRecordDecl *FieldClassDecl 1572 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1573 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1574 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1575 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1576 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1577 // set to the anonymous union data member used in the initializer 1578 // list. 1579 Value->setMember(*Field); 1580 Value->setAnonUnionMember(*FA); 1581 AllToInit.push_back(Value); 1582 break; 1583 } 1584 } 1585 } 1586 continue; 1587 } 1588 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1589 AllToInit.push_back(Value); 1590 continue; 1591 } 1592 1593 if ((*Field)->getType()->isDependentType() || AnyErrors) 1594 continue; 1595 1596 QualType FT = Context.getBaseElementType((*Field)->getType()); 1597 if (FT->getAs<RecordType>()) { 1598 InitializedEntity InitEntity 1599 = InitializedEntity::InitializeMember(*Field); 1600 InitializationKind InitKind 1601 = InitializationKind::CreateDefault(Constructor->getLocation()); 1602 1603 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1604 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1605 MultiExprArg(*this, 0, 0)); 1606 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1607 if (MemberInit.isInvalid()) { 1608 HadError = true; 1609 continue; 1610 } 1611 1612 // Don't attach synthesized member initializers in a dependent 1613 // context; they'll be regenerated a template instantiation 1614 // time. 1615 if (CurContext->isDependentContext()) 1616 continue; 1617 1618 CXXBaseOrMemberInitializer *Member = 1619 new (Context) CXXBaseOrMemberInitializer(Context, 1620 *Field, SourceLocation(), 1621 SourceLocation(), 1622 MemberInit.takeAs<Expr>(), 1623 SourceLocation()); 1624 1625 AllToInit.push_back(Member); 1626 } 1627 else if (FT->isReferenceType()) { 1628 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1629 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1630 << 0 << (*Field)->getDeclName(); 1631 Diag((*Field)->getLocation(), diag::note_declared_at); 1632 HadError = true; 1633 } 1634 else if (FT.isConstQualified()) { 1635 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1636 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1637 << 1 << (*Field)->getDeclName(); 1638 Diag((*Field)->getLocation(), diag::note_declared_at); 1639 HadError = true; 1640 } 1641 } 1642 1643 NumInitializers = AllToInit.size(); 1644 if (NumInitializers > 0) { 1645 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1646 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1647 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1648 memcpy(baseOrMemberInitializers, AllToInit.data(), 1649 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1650 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1651 1652 // Constructors implicitly reference the base and member 1653 // destructors. 1654 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1655 Constructor->getParent()); 1656 } 1657 1658 return HadError; 1659} 1660 1661static void *GetKeyForTopLevelField(FieldDecl *Field) { 1662 // For anonymous unions, use the class declaration as the key. 1663 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1664 if (RT->getDecl()->isAnonymousStructOrUnion()) 1665 return static_cast<void *>(RT->getDecl()); 1666 } 1667 return static_cast<void *>(Field); 1668} 1669 1670static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1671 return Context.getCanonicalType(BaseType).getTypePtr(); 1672} 1673 1674static void *GetKeyForMember(ASTContext &Context, 1675 CXXBaseOrMemberInitializer *Member, 1676 bool MemberMaybeAnon = false) { 1677 if (!Member->isMemberInitializer()) 1678 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1679 1680 // For fields injected into the class via declaration of an anonymous union, 1681 // use its anonymous union class declaration as the unique key. 1682 FieldDecl *Field = Member->getMember(); 1683 1684 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1685 // data member of the class. Data member used in the initializer list is 1686 // in AnonUnionMember field. 1687 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1688 Field = Member->getAnonUnionMember(); 1689 1690 // If the field is a member of an anonymous union, we use record decl of the 1691 // union as the key. 1692 RecordDecl *RD = Field->getParent(); 1693 if (RD->isAnonymousStructOrUnion() && RD->isUnion()) 1694 return static_cast<void *>(RD); 1695 1696 return static_cast<void *>(Field); 1697} 1698 1699static void 1700DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1701 const CXXConstructorDecl *Constructor, 1702 CXXBaseOrMemberInitializer **MemInits, 1703 unsigned NumMemInits) { 1704 if (Constructor->isDependentContext()) 1705 return; 1706 1707 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1708 Diagnostic::Ignored && 1709 SemaRef.Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1710 Diagnostic::Ignored) 1711 return; 1712 1713 // Also issue warning if order of ctor-initializer list does not match order 1714 // of 1) base class declarations and 2) order of non-static data members. 1715 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1716 1717 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1718 1719 // Push virtual bases before others. 1720 for (CXXRecordDecl::base_class_const_iterator VBase = 1721 ClassDecl->vbases_begin(), 1722 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1723 AllBaseOrMembers.push_back(GetKeyForBase(SemaRef.Context, 1724 VBase->getType())); 1725 1726 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1727 E = ClassDecl->bases_end(); Base != E; ++Base) { 1728 // Virtuals are alread in the virtual base list and are constructed 1729 // first. 1730 if (Base->isVirtual()) 1731 continue; 1732 AllBaseOrMembers.push_back(GetKeyForBase(SemaRef.Context, 1733 Base->getType())); 1734 } 1735 1736 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1737 E = ClassDecl->field_end(); Field != E; ++Field) 1738 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1739 1740 int Last = AllBaseOrMembers.size(); 1741 int curIndex = 0; 1742 CXXBaseOrMemberInitializer *PrevMember = 0; 1743 for (unsigned i = 0; i < NumMemInits; i++) { 1744 CXXBaseOrMemberInitializer *Member = MemInits[i]; 1745 void *MemberInCtorList = GetKeyForMember(SemaRef.Context, Member, true); 1746 1747 for (; curIndex < Last; curIndex++) 1748 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1749 break; 1750 if (curIndex == Last) { 1751 assert(PrevMember && "Member not in member list?!"); 1752 // Initializer as specified in ctor-initializer list is out of order. 1753 // Issue a warning diagnostic. 1754 if (PrevMember->isBaseInitializer()) { 1755 // Diagnostics is for an initialized base class. 1756 Type *BaseClass = PrevMember->getBaseClass(); 1757 SemaRef.Diag(PrevMember->getSourceLocation(), 1758 diag::warn_base_initialized) 1759 << QualType(BaseClass, 0); 1760 } else { 1761 FieldDecl *Field = PrevMember->getMember(); 1762 SemaRef.Diag(PrevMember->getSourceLocation(), 1763 diag::warn_field_initialized) 1764 << Field->getNameAsString(); 1765 } 1766 // Also the note! 1767 if (FieldDecl *Field = Member->getMember()) 1768 SemaRef.Diag(Member->getSourceLocation(), 1769 diag::note_fieldorbase_initialized_here) << 0 1770 << Field->getNameAsString(); 1771 else { 1772 Type *BaseClass = Member->getBaseClass(); 1773 SemaRef.Diag(Member->getSourceLocation(), 1774 diag::note_fieldorbase_initialized_here) << 1 1775 << QualType(BaseClass, 0); 1776 } 1777 for (curIndex = 0; curIndex < Last; curIndex++) 1778 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1779 break; 1780 } 1781 PrevMember = Member; 1782 } 1783} 1784 1785/// ActOnMemInitializers - Handle the member initializers for a constructor. 1786void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1787 SourceLocation ColonLoc, 1788 MemInitTy **meminits, unsigned NumMemInits, 1789 bool AnyErrors) { 1790 if (!ConstructorDecl) 1791 return; 1792 1793 AdjustDeclIfTemplate(ConstructorDecl); 1794 1795 CXXConstructorDecl *Constructor 1796 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1797 1798 if (!Constructor) { 1799 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1800 return; 1801 } 1802 1803 CXXBaseOrMemberInitializer **MemInits = 1804 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1805 1806 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1807 bool HadError = false; 1808 for (unsigned i = 0; i < NumMemInits; i++) { 1809 CXXBaseOrMemberInitializer *Member = MemInits[i]; 1810 1811 void *KeyToMember = GetKeyForMember(Context, Member); 1812 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1813 if (!PrevMember) { 1814 PrevMember = Member; 1815 continue; 1816 } 1817 if (FieldDecl *Field = Member->getMember()) 1818 Diag(Member->getSourceLocation(), 1819 diag::error_multiple_mem_initialization) 1820 << Field->getNameAsString() 1821 << Member->getSourceRange(); 1822 else { 1823 Type *BaseClass = Member->getBaseClass(); 1824 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1825 Diag(Member->getSourceLocation(), 1826 diag::error_multiple_base_initialization) 1827 << QualType(BaseClass, 0) 1828 << Member->getSourceRange(); 1829 } 1830 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1831 << 0; 1832 HadError = true; 1833 } 1834 1835 if (HadError) 1836 return; 1837 1838 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1839 1840 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1841} 1842 1843void 1844Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1845 CXXRecordDecl *ClassDecl) { 1846 // Ignore dependent contexts. 1847 if (ClassDecl->isDependentContext()) 1848 return; 1849 1850 // FIXME: all the access-control diagnostics are positioned on the 1851 // field/base declaration. That's probably good; that said, the 1852 // user might reasonably want to know why the destructor is being 1853 // emitted, and we currently don't say. 1854 1855 // Non-static data members. 1856 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1857 E = ClassDecl->field_end(); I != E; ++I) { 1858 FieldDecl *Field = *I; 1859 1860 QualType FieldType = Context.getBaseElementType(Field->getType()); 1861 1862 const RecordType* RT = FieldType->getAs<RecordType>(); 1863 if (!RT) 1864 continue; 1865 1866 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1867 if (FieldClassDecl->hasTrivialDestructor()) 1868 continue; 1869 1870 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1871 CheckDestructorAccess(Field->getLocation(), Dtor, 1872 PDiag(diag::err_access_dtor_field) 1873 << Field->getDeclName() 1874 << FieldType); 1875 1876 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1877 } 1878 1879 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1880 1881 // Bases. 1882 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1883 E = ClassDecl->bases_end(); Base != E; ++Base) { 1884 // Bases are always records in a well-formed non-dependent class. 1885 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1886 1887 // Remember direct virtual bases. 1888 if (Base->isVirtual()) 1889 DirectVirtualBases.insert(RT); 1890 1891 // Ignore trivial destructors. 1892 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1893 if (BaseClassDecl->hasTrivialDestructor()) 1894 continue; 1895 1896 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1897 1898 // FIXME: caret should be on the start of the class name 1899 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1900 PDiag(diag::err_access_dtor_base) 1901 << Base->getType() 1902 << Base->getSourceRange()); 1903 1904 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1905 } 1906 1907 // Virtual bases. 1908 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1909 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1910 1911 // Bases are always records in a well-formed non-dependent class. 1912 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1913 1914 // Ignore direct virtual bases. 1915 if (DirectVirtualBases.count(RT)) 1916 continue; 1917 1918 // Ignore trivial destructors. 1919 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1920 if (BaseClassDecl->hasTrivialDestructor()) 1921 continue; 1922 1923 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1924 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1925 PDiag(diag::err_access_dtor_vbase) 1926 << VBase->getType()); 1927 1928 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1929 } 1930} 1931 1932void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1933 if (!CDtorDecl) 1934 return; 1935 1936 if (CXXConstructorDecl *Constructor 1937 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1938 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 1939} 1940 1941bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1942 unsigned DiagID, AbstractDiagSelID SelID, 1943 const CXXRecordDecl *CurrentRD) { 1944 if (SelID == -1) 1945 return RequireNonAbstractType(Loc, T, 1946 PDiag(DiagID), CurrentRD); 1947 else 1948 return RequireNonAbstractType(Loc, T, 1949 PDiag(DiagID) << SelID, CurrentRD); 1950} 1951 1952bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1953 const PartialDiagnostic &PD, 1954 const CXXRecordDecl *CurrentRD) { 1955 if (!getLangOptions().CPlusPlus) 1956 return false; 1957 1958 if (const ArrayType *AT = Context.getAsArrayType(T)) 1959 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1960 CurrentRD); 1961 1962 if (const PointerType *PT = T->getAs<PointerType>()) { 1963 // Find the innermost pointer type. 1964 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1965 PT = T; 1966 1967 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1968 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1969 } 1970 1971 const RecordType *RT = T->getAs<RecordType>(); 1972 if (!RT) 1973 return false; 1974 1975 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1976 1977 if (CurrentRD && CurrentRD != RD) 1978 return false; 1979 1980 // FIXME: is this reasonable? It matches current behavior, but.... 1981 if (!RD->getDefinition()) 1982 return false; 1983 1984 if (!RD->isAbstract()) 1985 return false; 1986 1987 Diag(Loc, PD) << RD->getDeclName(); 1988 1989 // Check if we've already emitted the list of pure virtual functions for this 1990 // class. 1991 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1992 return true; 1993 1994 CXXFinalOverriderMap FinalOverriders; 1995 RD->getFinalOverriders(FinalOverriders); 1996 1997 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 1998 MEnd = FinalOverriders.end(); 1999 M != MEnd; 2000 ++M) { 2001 for (OverridingMethods::iterator SO = M->second.begin(), 2002 SOEnd = M->second.end(); 2003 SO != SOEnd; ++SO) { 2004 // C++ [class.abstract]p4: 2005 // A class is abstract if it contains or inherits at least one 2006 // pure virtual function for which the final overrider is pure 2007 // virtual. 2008 2009 // 2010 if (SO->second.size() != 1) 2011 continue; 2012 2013 if (!SO->second.front().Method->isPure()) 2014 continue; 2015 2016 Diag(SO->second.front().Method->getLocation(), 2017 diag::note_pure_virtual_function) 2018 << SO->second.front().Method->getDeclName(); 2019 } 2020 } 2021 2022 if (!PureVirtualClassDiagSet) 2023 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2024 PureVirtualClassDiagSet->insert(RD); 2025 2026 return true; 2027} 2028 2029namespace { 2030 class AbstractClassUsageDiagnoser 2031 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2032 Sema &SemaRef; 2033 CXXRecordDecl *AbstractClass; 2034 2035 bool VisitDeclContext(const DeclContext *DC) { 2036 bool Invalid = false; 2037 2038 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2039 E = DC->decls_end(); I != E; ++I) 2040 Invalid |= Visit(*I); 2041 2042 return Invalid; 2043 } 2044 2045 public: 2046 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2047 : SemaRef(SemaRef), AbstractClass(ac) { 2048 Visit(SemaRef.Context.getTranslationUnitDecl()); 2049 } 2050 2051 bool VisitFunctionDecl(const FunctionDecl *FD) { 2052 if (FD->isThisDeclarationADefinition()) { 2053 // No need to do the check if we're in a definition, because it requires 2054 // that the return/param types are complete. 2055 // because that requires 2056 return VisitDeclContext(FD); 2057 } 2058 2059 // Check the return type. 2060 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2061 bool Invalid = 2062 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2063 diag::err_abstract_type_in_decl, 2064 Sema::AbstractReturnType, 2065 AbstractClass); 2066 2067 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2068 E = FD->param_end(); I != E; ++I) { 2069 const ParmVarDecl *VD = *I; 2070 Invalid |= 2071 SemaRef.RequireNonAbstractType(VD->getLocation(), 2072 VD->getOriginalType(), 2073 diag::err_abstract_type_in_decl, 2074 Sema::AbstractParamType, 2075 AbstractClass); 2076 } 2077 2078 return Invalid; 2079 } 2080 2081 bool VisitDecl(const Decl* D) { 2082 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2083 return VisitDeclContext(DC); 2084 2085 return false; 2086 } 2087 }; 2088} 2089 2090/// \brief Perform semantic checks on a class definition that has been 2091/// completing, introducing implicitly-declared members, checking for 2092/// abstract types, etc. 2093void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2094 if (!Record || Record->isInvalidDecl()) 2095 return; 2096 2097 if (!Record->isDependentType()) 2098 AddImplicitlyDeclaredMembersToClass(Record); 2099 2100 if (Record->isInvalidDecl()) 2101 return; 2102 2103 // Set access bits correctly on the directly-declared conversions. 2104 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2105 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2106 Convs->setAccess(I, (*I)->getAccess()); 2107 2108 // Determine whether we need to check for final overriders. We do 2109 // this either when there are virtual base classes (in which case we 2110 // may end up finding multiple final overriders for a given virtual 2111 // function) or any of the base classes is abstract (in which case 2112 // we might detect that this class is abstract). 2113 bool CheckFinalOverriders = false; 2114 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2115 !Record->isDependentType()) { 2116 if (Record->getNumVBases()) 2117 CheckFinalOverriders = true; 2118 else if (!Record->isAbstract()) { 2119 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2120 BEnd = Record->bases_end(); 2121 B != BEnd; ++B) { 2122 CXXRecordDecl *BaseDecl 2123 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2124 if (BaseDecl->isAbstract()) { 2125 CheckFinalOverriders = true; 2126 break; 2127 } 2128 } 2129 } 2130 } 2131 2132 if (CheckFinalOverriders) { 2133 CXXFinalOverriderMap FinalOverriders; 2134 Record->getFinalOverriders(FinalOverriders); 2135 2136 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2137 MEnd = FinalOverriders.end(); 2138 M != MEnd; ++M) { 2139 for (OverridingMethods::iterator SO = M->second.begin(), 2140 SOEnd = M->second.end(); 2141 SO != SOEnd; ++SO) { 2142 assert(SO->second.size() > 0 && 2143 "All virtual functions have overridding virtual functions"); 2144 if (SO->second.size() == 1) { 2145 // C++ [class.abstract]p4: 2146 // A class is abstract if it contains or inherits at least one 2147 // pure virtual function for which the final overrider is pure 2148 // virtual. 2149 if (SO->second.front().Method->isPure()) 2150 Record->setAbstract(true); 2151 continue; 2152 } 2153 2154 // C++ [class.virtual]p2: 2155 // In a derived class, if a virtual member function of a base 2156 // class subobject has more than one final overrider the 2157 // program is ill-formed. 2158 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2159 << (NamedDecl *)M->first << Record; 2160 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2161 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2162 OMEnd = SO->second.end(); 2163 OM != OMEnd; ++OM) 2164 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2165 << (NamedDecl *)M->first << OM->Method->getParent(); 2166 2167 Record->setInvalidDecl(); 2168 } 2169 } 2170 } 2171 2172 if (Record->isAbstract() && !Record->isInvalidDecl()) 2173 (void)AbstractClassUsageDiagnoser(*this, Record); 2174} 2175 2176void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2177 DeclPtrTy TagDecl, 2178 SourceLocation LBrac, 2179 SourceLocation RBrac, 2180 AttributeList *AttrList) { 2181 if (!TagDecl) 2182 return; 2183 2184 AdjustDeclIfTemplate(TagDecl); 2185 2186 ActOnFields(S, RLoc, TagDecl, 2187 (DeclPtrTy*)FieldCollector->getCurFields(), 2188 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2189 2190 CheckCompletedCXXClass( 2191 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2192} 2193 2194/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2195/// special functions, such as the default constructor, copy 2196/// constructor, or destructor, to the given C++ class (C++ 2197/// [special]p1). This routine can only be executed just before the 2198/// definition of the class is complete. 2199void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2200 CanQualType ClassType 2201 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2202 2203 // FIXME: Implicit declarations have exception specifications, which are 2204 // the union of the specifications of the implicitly called functions. 2205 2206 if (!ClassDecl->hasUserDeclaredConstructor()) { 2207 // C++ [class.ctor]p5: 2208 // A default constructor for a class X is a constructor of class X 2209 // that can be called without an argument. If there is no 2210 // user-declared constructor for class X, a default constructor is 2211 // implicitly declared. An implicitly-declared default constructor 2212 // is an inline public member of its class. 2213 DeclarationName Name 2214 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2215 CXXConstructorDecl *DefaultCon = 2216 CXXConstructorDecl::Create(Context, ClassDecl, 2217 ClassDecl->getLocation(), Name, 2218 Context.getFunctionType(Context.VoidTy, 2219 0, 0, false, 0, 2220 /*FIXME*/false, false, 2221 0, 0, 2222 FunctionType::ExtInfo()), 2223 /*TInfo=*/0, 2224 /*isExplicit=*/false, 2225 /*isInline=*/true, 2226 /*isImplicitlyDeclared=*/true); 2227 DefaultCon->setAccess(AS_public); 2228 DefaultCon->setImplicit(); 2229 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2230 ClassDecl->addDecl(DefaultCon); 2231 } 2232 2233 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2234 // C++ [class.copy]p4: 2235 // If the class definition does not explicitly declare a copy 2236 // constructor, one is declared implicitly. 2237 2238 // C++ [class.copy]p5: 2239 // The implicitly-declared copy constructor for a class X will 2240 // have the form 2241 // 2242 // X::X(const X&) 2243 // 2244 // if 2245 bool HasConstCopyConstructor = true; 2246 2247 // -- each direct or virtual base class B of X has a copy 2248 // constructor whose first parameter is of type const B& or 2249 // const volatile B&, and 2250 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2251 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2252 const CXXRecordDecl *BaseClassDecl 2253 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2254 HasConstCopyConstructor 2255 = BaseClassDecl->hasConstCopyConstructor(Context); 2256 } 2257 2258 // -- for all the nonstatic data members of X that are of a 2259 // class type M (or array thereof), each such class type 2260 // has a copy constructor whose first parameter is of type 2261 // const M& or const volatile M&. 2262 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2263 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2264 ++Field) { 2265 QualType FieldType = (*Field)->getType(); 2266 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2267 FieldType = Array->getElementType(); 2268 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2269 const CXXRecordDecl *FieldClassDecl 2270 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2271 HasConstCopyConstructor 2272 = FieldClassDecl->hasConstCopyConstructor(Context); 2273 } 2274 } 2275 2276 // Otherwise, the implicitly declared copy constructor will have 2277 // the form 2278 // 2279 // X::X(X&) 2280 QualType ArgType = ClassType; 2281 if (HasConstCopyConstructor) 2282 ArgType = ArgType.withConst(); 2283 ArgType = Context.getLValueReferenceType(ArgType); 2284 2285 // An implicitly-declared copy constructor is an inline public 2286 // member of its class. 2287 DeclarationName Name 2288 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2289 CXXConstructorDecl *CopyConstructor 2290 = CXXConstructorDecl::Create(Context, ClassDecl, 2291 ClassDecl->getLocation(), Name, 2292 Context.getFunctionType(Context.VoidTy, 2293 &ArgType, 1, 2294 false, 0, 2295 /*FIXME:*/false, 2296 false, 0, 0, 2297 FunctionType::ExtInfo()), 2298 /*TInfo=*/0, 2299 /*isExplicit=*/false, 2300 /*isInline=*/true, 2301 /*isImplicitlyDeclared=*/true); 2302 CopyConstructor->setAccess(AS_public); 2303 CopyConstructor->setImplicit(); 2304 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2305 2306 // Add the parameter to the constructor. 2307 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2308 ClassDecl->getLocation(), 2309 /*IdentifierInfo=*/0, 2310 ArgType, /*TInfo=*/0, 2311 VarDecl::None, 0); 2312 CopyConstructor->setParams(&FromParam, 1); 2313 ClassDecl->addDecl(CopyConstructor); 2314 } 2315 2316 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2317 // Note: The following rules are largely analoguous to the copy 2318 // constructor rules. Note that virtual bases are not taken into account 2319 // for determining the argument type of the operator. Note also that 2320 // operators taking an object instead of a reference are allowed. 2321 // 2322 // C++ [class.copy]p10: 2323 // If the class definition does not explicitly declare a copy 2324 // assignment operator, one is declared implicitly. 2325 // The implicitly-defined copy assignment operator for a class X 2326 // will have the form 2327 // 2328 // X& X::operator=(const X&) 2329 // 2330 // if 2331 bool HasConstCopyAssignment = true; 2332 2333 // -- each direct base class B of X has a copy assignment operator 2334 // whose parameter is of type const B&, const volatile B& or B, 2335 // and 2336 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2337 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2338 assert(!Base->getType()->isDependentType() && 2339 "Cannot generate implicit members for class with dependent bases."); 2340 const CXXRecordDecl *BaseClassDecl 2341 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2342 const CXXMethodDecl *MD = 0; 2343 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2344 MD); 2345 } 2346 2347 // -- for all the nonstatic data members of X that are of a class 2348 // type M (or array thereof), each such class type has a copy 2349 // assignment operator whose parameter is of type const M&, 2350 // const volatile M& or M. 2351 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2352 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2353 ++Field) { 2354 QualType FieldType = (*Field)->getType(); 2355 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2356 FieldType = Array->getElementType(); 2357 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2358 const CXXRecordDecl *FieldClassDecl 2359 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2360 const CXXMethodDecl *MD = 0; 2361 HasConstCopyAssignment 2362 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2363 } 2364 } 2365 2366 // Otherwise, the implicitly declared copy assignment operator will 2367 // have the form 2368 // 2369 // X& X::operator=(X&) 2370 QualType ArgType = ClassType; 2371 QualType RetType = Context.getLValueReferenceType(ArgType); 2372 if (HasConstCopyAssignment) 2373 ArgType = ArgType.withConst(); 2374 ArgType = Context.getLValueReferenceType(ArgType); 2375 2376 // An implicitly-declared copy assignment operator is an inline public 2377 // member of its class. 2378 DeclarationName Name = 2379 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2380 CXXMethodDecl *CopyAssignment = 2381 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2382 Context.getFunctionType(RetType, &ArgType, 1, 2383 false, 0, 2384 /*FIXME:*/false, 2385 false, 0, 0, 2386 FunctionType::ExtInfo()), 2387 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2388 CopyAssignment->setAccess(AS_public); 2389 CopyAssignment->setImplicit(); 2390 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2391 CopyAssignment->setCopyAssignment(true); 2392 2393 // Add the parameter to the operator. 2394 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2395 ClassDecl->getLocation(), 2396 /*IdentifierInfo=*/0, 2397 ArgType, /*TInfo=*/0, 2398 VarDecl::None, 0); 2399 CopyAssignment->setParams(&FromParam, 1); 2400 2401 // Don't call addedAssignmentOperator. There is no way to distinguish an 2402 // implicit from an explicit assignment operator. 2403 ClassDecl->addDecl(CopyAssignment); 2404 AddOverriddenMethods(ClassDecl, CopyAssignment); 2405 } 2406 2407 if (!ClassDecl->hasUserDeclaredDestructor()) { 2408 // C++ [class.dtor]p2: 2409 // If a class has no user-declared destructor, a destructor is 2410 // declared implicitly. An implicitly-declared destructor is an 2411 // inline public member of its class. 2412 QualType Ty = Context.getFunctionType(Context.VoidTy, 2413 0, 0, false, 0, 2414 /*FIXME:*/false, 2415 false, 0, 0, FunctionType::ExtInfo()); 2416 2417 DeclarationName Name 2418 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2419 CXXDestructorDecl *Destructor 2420 = CXXDestructorDecl::Create(Context, ClassDecl, 2421 ClassDecl->getLocation(), Name, Ty, 2422 /*isInline=*/true, 2423 /*isImplicitlyDeclared=*/true); 2424 Destructor->setAccess(AS_public); 2425 Destructor->setImplicit(); 2426 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2427 ClassDecl->addDecl(Destructor); 2428 2429 // This could be uniqued if it ever proves significant. 2430 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2431 2432 AddOverriddenMethods(ClassDecl, Destructor); 2433 } 2434} 2435 2436void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2437 Decl *D = TemplateD.getAs<Decl>(); 2438 if (!D) 2439 return; 2440 2441 TemplateParameterList *Params = 0; 2442 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2443 Params = Template->getTemplateParameters(); 2444 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2445 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2446 Params = PartialSpec->getTemplateParameters(); 2447 else 2448 return; 2449 2450 for (TemplateParameterList::iterator Param = Params->begin(), 2451 ParamEnd = Params->end(); 2452 Param != ParamEnd; ++Param) { 2453 NamedDecl *Named = cast<NamedDecl>(*Param); 2454 if (Named->getDeclName()) { 2455 S->AddDecl(DeclPtrTy::make(Named)); 2456 IdResolver.AddDecl(Named); 2457 } 2458 } 2459} 2460 2461void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2462 if (!RecordD) return; 2463 AdjustDeclIfTemplate(RecordD); 2464 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2465 PushDeclContext(S, Record); 2466} 2467 2468void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2469 if (!RecordD) return; 2470 PopDeclContext(); 2471} 2472 2473/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2474/// parsing a top-level (non-nested) C++ class, and we are now 2475/// parsing those parts of the given Method declaration that could 2476/// not be parsed earlier (C++ [class.mem]p2), such as default 2477/// arguments. This action should enter the scope of the given 2478/// Method declaration as if we had just parsed the qualified method 2479/// name. However, it should not bring the parameters into scope; 2480/// that will be performed by ActOnDelayedCXXMethodParameter. 2481void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2482} 2483 2484/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2485/// C++ method declaration. We're (re-)introducing the given 2486/// function parameter into scope for use in parsing later parts of 2487/// the method declaration. For example, we could see an 2488/// ActOnParamDefaultArgument event for this parameter. 2489void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2490 if (!ParamD) 2491 return; 2492 2493 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2494 2495 // If this parameter has an unparsed default argument, clear it out 2496 // to make way for the parsed default argument. 2497 if (Param->hasUnparsedDefaultArg()) 2498 Param->setDefaultArg(0); 2499 2500 S->AddDecl(DeclPtrTy::make(Param)); 2501 if (Param->getDeclName()) 2502 IdResolver.AddDecl(Param); 2503} 2504 2505/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2506/// processing the delayed method declaration for Method. The method 2507/// declaration is now considered finished. There may be a separate 2508/// ActOnStartOfFunctionDef action later (not necessarily 2509/// immediately!) for this method, if it was also defined inside the 2510/// class body. 2511void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2512 if (!MethodD) 2513 return; 2514 2515 AdjustDeclIfTemplate(MethodD); 2516 2517 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2518 2519 // Now that we have our default arguments, check the constructor 2520 // again. It could produce additional diagnostics or affect whether 2521 // the class has implicitly-declared destructors, among other 2522 // things. 2523 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2524 CheckConstructor(Constructor); 2525 2526 // Check the default arguments, which we may have added. 2527 if (!Method->isInvalidDecl()) 2528 CheckCXXDefaultArguments(Method); 2529} 2530 2531/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2532/// the well-formedness of the constructor declarator @p D with type @p 2533/// R. If there are any errors in the declarator, this routine will 2534/// emit diagnostics and set the invalid bit to true. In any case, the type 2535/// will be updated to reflect a well-formed type for the constructor and 2536/// returned. 2537QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2538 FunctionDecl::StorageClass &SC) { 2539 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2540 2541 // C++ [class.ctor]p3: 2542 // A constructor shall not be virtual (10.3) or static (9.4). A 2543 // constructor can be invoked for a const, volatile or const 2544 // volatile object. A constructor shall not be declared const, 2545 // volatile, or const volatile (9.3.2). 2546 if (isVirtual) { 2547 if (!D.isInvalidType()) 2548 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2549 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2550 << SourceRange(D.getIdentifierLoc()); 2551 D.setInvalidType(); 2552 } 2553 if (SC == FunctionDecl::Static) { 2554 if (!D.isInvalidType()) 2555 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2556 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2557 << SourceRange(D.getIdentifierLoc()); 2558 D.setInvalidType(); 2559 SC = FunctionDecl::None; 2560 } 2561 2562 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2563 if (FTI.TypeQuals != 0) { 2564 if (FTI.TypeQuals & Qualifiers::Const) 2565 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2566 << "const" << SourceRange(D.getIdentifierLoc()); 2567 if (FTI.TypeQuals & Qualifiers::Volatile) 2568 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2569 << "volatile" << SourceRange(D.getIdentifierLoc()); 2570 if (FTI.TypeQuals & Qualifiers::Restrict) 2571 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2572 << "restrict" << SourceRange(D.getIdentifierLoc()); 2573 } 2574 2575 // Rebuild the function type "R" without any type qualifiers (in 2576 // case any of the errors above fired) and with "void" as the 2577 // return type, since constructors don't have return types. We 2578 // *always* have to do this, because GetTypeForDeclarator will 2579 // put in a result type of "int" when none was specified. 2580 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2581 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2582 Proto->getNumArgs(), 2583 Proto->isVariadic(), 0, 2584 Proto->hasExceptionSpec(), 2585 Proto->hasAnyExceptionSpec(), 2586 Proto->getNumExceptions(), 2587 Proto->exception_begin(), 2588 Proto->getExtInfo()); 2589} 2590 2591/// CheckConstructor - Checks a fully-formed constructor for 2592/// well-formedness, issuing any diagnostics required. Returns true if 2593/// the constructor declarator is invalid. 2594void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2595 CXXRecordDecl *ClassDecl 2596 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2597 if (!ClassDecl) 2598 return Constructor->setInvalidDecl(); 2599 2600 // C++ [class.copy]p3: 2601 // A declaration of a constructor for a class X is ill-formed if 2602 // its first parameter is of type (optionally cv-qualified) X and 2603 // either there are no other parameters or else all other 2604 // parameters have default arguments. 2605 if (!Constructor->isInvalidDecl() && 2606 ((Constructor->getNumParams() == 1) || 2607 (Constructor->getNumParams() > 1 && 2608 Constructor->getParamDecl(1)->hasDefaultArg())) && 2609 Constructor->getTemplateSpecializationKind() 2610 != TSK_ImplicitInstantiation) { 2611 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2612 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2613 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2614 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2615 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2616 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2617 2618 // FIXME: Rather that making the constructor invalid, we should endeavor 2619 // to fix the type. 2620 Constructor->setInvalidDecl(); 2621 } 2622 } 2623 2624 // Notify the class that we've added a constructor. 2625 ClassDecl->addedConstructor(Context, Constructor); 2626} 2627 2628/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2629/// issuing any diagnostics required. Returns true on error. 2630bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2631 CXXRecordDecl *RD = Destructor->getParent(); 2632 2633 if (Destructor->isVirtual()) { 2634 SourceLocation Loc; 2635 2636 if (!Destructor->isImplicit()) 2637 Loc = Destructor->getLocation(); 2638 else 2639 Loc = RD->getLocation(); 2640 2641 // If we have a virtual destructor, look up the deallocation function 2642 FunctionDecl *OperatorDelete = 0; 2643 DeclarationName Name = 2644 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2645 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2646 return true; 2647 2648 Destructor->setOperatorDelete(OperatorDelete); 2649 } 2650 2651 return false; 2652} 2653 2654static inline bool 2655FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2656 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2657 FTI.ArgInfo[0].Param && 2658 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2659} 2660 2661/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2662/// the well-formednes of the destructor declarator @p D with type @p 2663/// R. If there are any errors in the declarator, this routine will 2664/// emit diagnostics and set the declarator to invalid. Even if this happens, 2665/// will be updated to reflect a well-formed type for the destructor and 2666/// returned. 2667QualType Sema::CheckDestructorDeclarator(Declarator &D, 2668 FunctionDecl::StorageClass& SC) { 2669 // C++ [class.dtor]p1: 2670 // [...] A typedef-name that names a class is a class-name 2671 // (7.1.3); however, a typedef-name that names a class shall not 2672 // be used as the identifier in the declarator for a destructor 2673 // declaration. 2674 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2675 if (isa<TypedefType>(DeclaratorType)) { 2676 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2677 << DeclaratorType; 2678 D.setInvalidType(); 2679 } 2680 2681 // C++ [class.dtor]p2: 2682 // A destructor is used to destroy objects of its class type. A 2683 // destructor takes no parameters, and no return type can be 2684 // specified for it (not even void). The address of a destructor 2685 // shall not be taken. A destructor shall not be static. A 2686 // destructor can be invoked for a const, volatile or const 2687 // volatile object. A destructor shall not be declared const, 2688 // volatile or const volatile (9.3.2). 2689 if (SC == FunctionDecl::Static) { 2690 if (!D.isInvalidType()) 2691 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2692 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2693 << SourceRange(D.getIdentifierLoc()); 2694 SC = FunctionDecl::None; 2695 D.setInvalidType(); 2696 } 2697 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2698 // Destructors don't have return types, but the parser will 2699 // happily parse something like: 2700 // 2701 // class X { 2702 // float ~X(); 2703 // }; 2704 // 2705 // The return type will be eliminated later. 2706 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2707 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2708 << SourceRange(D.getIdentifierLoc()); 2709 } 2710 2711 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2712 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2713 if (FTI.TypeQuals & Qualifiers::Const) 2714 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2715 << "const" << SourceRange(D.getIdentifierLoc()); 2716 if (FTI.TypeQuals & Qualifiers::Volatile) 2717 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2718 << "volatile" << SourceRange(D.getIdentifierLoc()); 2719 if (FTI.TypeQuals & Qualifiers::Restrict) 2720 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2721 << "restrict" << SourceRange(D.getIdentifierLoc()); 2722 D.setInvalidType(); 2723 } 2724 2725 // Make sure we don't have any parameters. 2726 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2727 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2728 2729 // Delete the parameters. 2730 FTI.freeArgs(); 2731 D.setInvalidType(); 2732 } 2733 2734 // Make sure the destructor isn't variadic. 2735 if (FTI.isVariadic) { 2736 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2737 D.setInvalidType(); 2738 } 2739 2740 // Rebuild the function type "R" without any type qualifiers or 2741 // parameters (in case any of the errors above fired) and with 2742 // "void" as the return type, since destructors don't have return 2743 // types. We *always* have to do this, because GetTypeForDeclarator 2744 // will put in a result type of "int" when none was specified. 2745 // FIXME: Exceptions! 2746 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2747 false, false, 0, 0, FunctionType::ExtInfo()); 2748} 2749 2750/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2751/// well-formednes of the conversion function declarator @p D with 2752/// type @p R. If there are any errors in the declarator, this routine 2753/// will emit diagnostics and return true. Otherwise, it will return 2754/// false. Either way, the type @p R will be updated to reflect a 2755/// well-formed type for the conversion operator. 2756void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2757 FunctionDecl::StorageClass& SC) { 2758 // C++ [class.conv.fct]p1: 2759 // Neither parameter types nor return type can be specified. The 2760 // type of a conversion function (8.3.5) is "function taking no 2761 // parameter returning conversion-type-id." 2762 if (SC == FunctionDecl::Static) { 2763 if (!D.isInvalidType()) 2764 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2765 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2766 << SourceRange(D.getIdentifierLoc()); 2767 D.setInvalidType(); 2768 SC = FunctionDecl::None; 2769 } 2770 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2771 // Conversion functions don't have return types, but the parser will 2772 // happily parse something like: 2773 // 2774 // class X { 2775 // float operator bool(); 2776 // }; 2777 // 2778 // The return type will be changed later anyway. 2779 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2780 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2781 << SourceRange(D.getIdentifierLoc()); 2782 } 2783 2784 // Make sure we don't have any parameters. 2785 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2786 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2787 2788 // Delete the parameters. 2789 D.getTypeObject(0).Fun.freeArgs(); 2790 D.setInvalidType(); 2791 } 2792 2793 // Make sure the conversion function isn't variadic. 2794 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2795 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2796 D.setInvalidType(); 2797 } 2798 2799 // C++ [class.conv.fct]p4: 2800 // The conversion-type-id shall not represent a function type nor 2801 // an array type. 2802 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2803 if (ConvType->isArrayType()) { 2804 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2805 ConvType = Context.getPointerType(ConvType); 2806 D.setInvalidType(); 2807 } else if (ConvType->isFunctionType()) { 2808 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2809 ConvType = Context.getPointerType(ConvType); 2810 D.setInvalidType(); 2811 } 2812 2813 // Rebuild the function type "R" without any parameters (in case any 2814 // of the errors above fired) and with the conversion type as the 2815 // return type. 2816 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2817 R = Context.getFunctionType(ConvType, 0, 0, false, 2818 Proto->getTypeQuals(), 2819 Proto->hasExceptionSpec(), 2820 Proto->hasAnyExceptionSpec(), 2821 Proto->getNumExceptions(), 2822 Proto->exception_begin(), 2823 Proto->getExtInfo()); 2824 2825 // C++0x explicit conversion operators. 2826 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2827 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2828 diag::warn_explicit_conversion_functions) 2829 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2830} 2831 2832/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2833/// the declaration of the given C++ conversion function. This routine 2834/// is responsible for recording the conversion function in the C++ 2835/// class, if possible. 2836Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2837 assert(Conversion && "Expected to receive a conversion function declaration"); 2838 2839 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2840 2841 // Make sure we aren't redeclaring the conversion function. 2842 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2843 2844 // C++ [class.conv.fct]p1: 2845 // [...] A conversion function is never used to convert a 2846 // (possibly cv-qualified) object to the (possibly cv-qualified) 2847 // same object type (or a reference to it), to a (possibly 2848 // cv-qualified) base class of that type (or a reference to it), 2849 // or to (possibly cv-qualified) void. 2850 // FIXME: Suppress this warning if the conversion function ends up being a 2851 // virtual function that overrides a virtual function in a base class. 2852 QualType ClassType 2853 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2854 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2855 ConvType = ConvTypeRef->getPointeeType(); 2856 if (ConvType->isRecordType()) { 2857 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2858 if (ConvType == ClassType) 2859 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2860 << ClassType; 2861 else if (IsDerivedFrom(ClassType, ConvType)) 2862 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2863 << ClassType << ConvType; 2864 } else if (ConvType->isVoidType()) { 2865 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2866 << ClassType << ConvType; 2867 } 2868 2869 if (Conversion->getPrimaryTemplate()) { 2870 // ignore specializations 2871 } else if (Conversion->getPreviousDeclaration()) { 2872 if (FunctionTemplateDecl *ConversionTemplate 2873 = Conversion->getDescribedFunctionTemplate()) { 2874 if (ClassDecl->replaceConversion( 2875 ConversionTemplate->getPreviousDeclaration(), 2876 ConversionTemplate)) 2877 return DeclPtrTy::make(ConversionTemplate); 2878 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2879 Conversion)) 2880 return DeclPtrTy::make(Conversion); 2881 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2882 } else if (FunctionTemplateDecl *ConversionTemplate 2883 = Conversion->getDescribedFunctionTemplate()) 2884 ClassDecl->addConversionFunction(ConversionTemplate); 2885 else 2886 ClassDecl->addConversionFunction(Conversion); 2887 2888 return DeclPtrTy::make(Conversion); 2889} 2890 2891//===----------------------------------------------------------------------===// 2892// Namespace Handling 2893//===----------------------------------------------------------------------===// 2894 2895/// ActOnStartNamespaceDef - This is called at the start of a namespace 2896/// definition. 2897Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2898 SourceLocation IdentLoc, 2899 IdentifierInfo *II, 2900 SourceLocation LBrace, 2901 AttributeList *AttrList) { 2902 NamespaceDecl *Namespc = 2903 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2904 Namespc->setLBracLoc(LBrace); 2905 2906 Scope *DeclRegionScope = NamespcScope->getParent(); 2907 2908 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2909 2910 if (II) { 2911 // C++ [namespace.def]p2: 2912 // The identifier in an original-namespace-definition shall not have been 2913 // previously defined in the declarative region in which the 2914 // original-namespace-definition appears. The identifier in an 2915 // original-namespace-definition is the name of the namespace. Subsequently 2916 // in that declarative region, it is treated as an original-namespace-name. 2917 2918 NamedDecl *PrevDecl 2919 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2920 ForRedeclaration); 2921 2922 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2923 // This is an extended namespace definition. 2924 // Attach this namespace decl to the chain of extended namespace 2925 // definitions. 2926 OrigNS->setNextNamespace(Namespc); 2927 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2928 2929 // Remove the previous declaration from the scope. 2930 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2931 IdResolver.RemoveDecl(OrigNS); 2932 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2933 } 2934 } else if (PrevDecl) { 2935 // This is an invalid name redefinition. 2936 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2937 << Namespc->getDeclName(); 2938 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2939 Namespc->setInvalidDecl(); 2940 // Continue on to push Namespc as current DeclContext and return it. 2941 } else if (II->isStr("std") && 2942 CurContext->getLookupContext()->isTranslationUnit()) { 2943 // This is the first "real" definition of the namespace "std", so update 2944 // our cache of the "std" namespace to point at this definition. 2945 if (StdNamespace) { 2946 // We had already defined a dummy namespace "std". Link this new 2947 // namespace definition to the dummy namespace "std". 2948 StdNamespace->setNextNamespace(Namespc); 2949 StdNamespace->setLocation(IdentLoc); 2950 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2951 } 2952 2953 // Make our StdNamespace cache point at the first real definition of the 2954 // "std" namespace. 2955 StdNamespace = Namespc; 2956 } 2957 2958 PushOnScopeChains(Namespc, DeclRegionScope); 2959 } else { 2960 // Anonymous namespaces. 2961 assert(Namespc->isAnonymousNamespace()); 2962 2963 // Link the anonymous namespace into its parent. 2964 NamespaceDecl *PrevDecl; 2965 DeclContext *Parent = CurContext->getLookupContext(); 2966 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2967 PrevDecl = TU->getAnonymousNamespace(); 2968 TU->setAnonymousNamespace(Namespc); 2969 } else { 2970 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2971 PrevDecl = ND->getAnonymousNamespace(); 2972 ND->setAnonymousNamespace(Namespc); 2973 } 2974 2975 // Link the anonymous namespace with its previous declaration. 2976 if (PrevDecl) { 2977 assert(PrevDecl->isAnonymousNamespace()); 2978 assert(!PrevDecl->getNextNamespace()); 2979 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2980 PrevDecl->setNextNamespace(Namespc); 2981 } 2982 2983 CurContext->addDecl(Namespc); 2984 2985 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2986 // behaves as if it were replaced by 2987 // namespace unique { /* empty body */ } 2988 // using namespace unique; 2989 // namespace unique { namespace-body } 2990 // where all occurrences of 'unique' in a translation unit are 2991 // replaced by the same identifier and this identifier differs 2992 // from all other identifiers in the entire program. 2993 2994 // We just create the namespace with an empty name and then add an 2995 // implicit using declaration, just like the standard suggests. 2996 // 2997 // CodeGen enforces the "universally unique" aspect by giving all 2998 // declarations semantically contained within an anonymous 2999 // namespace internal linkage. 3000 3001 if (!PrevDecl) { 3002 UsingDirectiveDecl* UD 3003 = UsingDirectiveDecl::Create(Context, CurContext, 3004 /* 'using' */ LBrace, 3005 /* 'namespace' */ SourceLocation(), 3006 /* qualifier */ SourceRange(), 3007 /* NNS */ NULL, 3008 /* identifier */ SourceLocation(), 3009 Namespc, 3010 /* Ancestor */ CurContext); 3011 UD->setImplicit(); 3012 CurContext->addDecl(UD); 3013 } 3014 } 3015 3016 // Although we could have an invalid decl (i.e. the namespace name is a 3017 // redefinition), push it as current DeclContext and try to continue parsing. 3018 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3019 // for the namespace has the declarations that showed up in that particular 3020 // namespace definition. 3021 PushDeclContext(NamespcScope, Namespc); 3022 return DeclPtrTy::make(Namespc); 3023} 3024 3025/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3026/// is a namespace alias, returns the namespace it points to. 3027static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3028 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3029 return AD->getNamespace(); 3030 return dyn_cast_or_null<NamespaceDecl>(D); 3031} 3032 3033/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3034/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3035void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3036 Decl *Dcl = D.getAs<Decl>(); 3037 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3038 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3039 Namespc->setRBracLoc(RBrace); 3040 PopDeclContext(); 3041} 3042 3043Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3044 SourceLocation UsingLoc, 3045 SourceLocation NamespcLoc, 3046 const CXXScopeSpec &SS, 3047 SourceLocation IdentLoc, 3048 IdentifierInfo *NamespcName, 3049 AttributeList *AttrList) { 3050 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3051 assert(NamespcName && "Invalid NamespcName."); 3052 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3053 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3054 3055 UsingDirectiveDecl *UDir = 0; 3056 3057 // Lookup namespace name. 3058 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3059 LookupParsedName(R, S, &SS); 3060 if (R.isAmbiguous()) 3061 return DeclPtrTy(); 3062 3063 if (!R.empty()) { 3064 NamedDecl *Named = R.getFoundDecl(); 3065 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3066 && "expected namespace decl"); 3067 // C++ [namespace.udir]p1: 3068 // A using-directive specifies that the names in the nominated 3069 // namespace can be used in the scope in which the 3070 // using-directive appears after the using-directive. During 3071 // unqualified name lookup (3.4.1), the names appear as if they 3072 // were declared in the nearest enclosing namespace which 3073 // contains both the using-directive and the nominated 3074 // namespace. [Note: in this context, "contains" means "contains 3075 // directly or indirectly". ] 3076 3077 // Find enclosing context containing both using-directive and 3078 // nominated namespace. 3079 NamespaceDecl *NS = getNamespaceDecl(Named); 3080 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3081 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3082 CommonAncestor = CommonAncestor->getParent(); 3083 3084 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3085 SS.getRange(), 3086 (NestedNameSpecifier *)SS.getScopeRep(), 3087 IdentLoc, Named, CommonAncestor); 3088 PushUsingDirective(S, UDir); 3089 } else { 3090 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3091 } 3092 3093 // FIXME: We ignore attributes for now. 3094 delete AttrList; 3095 return DeclPtrTy::make(UDir); 3096} 3097 3098void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3099 // If scope has associated entity, then using directive is at namespace 3100 // or translation unit scope. We add UsingDirectiveDecls, into 3101 // it's lookup structure. 3102 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3103 Ctx->addDecl(UDir); 3104 else 3105 // Otherwise it is block-sope. using-directives will affect lookup 3106 // only to the end of scope. 3107 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3108} 3109 3110 3111Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3112 AccessSpecifier AS, 3113 bool HasUsingKeyword, 3114 SourceLocation UsingLoc, 3115 const CXXScopeSpec &SS, 3116 UnqualifiedId &Name, 3117 AttributeList *AttrList, 3118 bool IsTypeName, 3119 SourceLocation TypenameLoc) { 3120 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3121 3122 switch (Name.getKind()) { 3123 case UnqualifiedId::IK_Identifier: 3124 case UnqualifiedId::IK_OperatorFunctionId: 3125 case UnqualifiedId::IK_LiteralOperatorId: 3126 case UnqualifiedId::IK_ConversionFunctionId: 3127 break; 3128 3129 case UnqualifiedId::IK_ConstructorName: 3130 case UnqualifiedId::IK_ConstructorTemplateId: 3131 // C++0x inherited constructors. 3132 if (getLangOptions().CPlusPlus0x) break; 3133 3134 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3135 << SS.getRange(); 3136 return DeclPtrTy(); 3137 3138 case UnqualifiedId::IK_DestructorName: 3139 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3140 << SS.getRange(); 3141 return DeclPtrTy(); 3142 3143 case UnqualifiedId::IK_TemplateId: 3144 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3145 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3146 return DeclPtrTy(); 3147 } 3148 3149 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3150 if (!TargetName) 3151 return DeclPtrTy(); 3152 3153 // Warn about using declarations. 3154 // TODO: store that the declaration was written without 'using' and 3155 // talk about access decls instead of using decls in the 3156 // diagnostics. 3157 if (!HasUsingKeyword) { 3158 UsingLoc = Name.getSourceRange().getBegin(); 3159 3160 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3161 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3162 } 3163 3164 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3165 Name.getSourceRange().getBegin(), 3166 TargetName, AttrList, 3167 /* IsInstantiation */ false, 3168 IsTypeName, TypenameLoc); 3169 if (UD) 3170 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3171 3172 return DeclPtrTy::make(UD); 3173} 3174 3175/// Determines whether to create a using shadow decl for a particular 3176/// decl, given the set of decls existing prior to this using lookup. 3177bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3178 const LookupResult &Previous) { 3179 // Diagnose finding a decl which is not from a base class of the 3180 // current class. We do this now because there are cases where this 3181 // function will silently decide not to build a shadow decl, which 3182 // will pre-empt further diagnostics. 3183 // 3184 // We don't need to do this in C++0x because we do the check once on 3185 // the qualifier. 3186 // 3187 // FIXME: diagnose the following if we care enough: 3188 // struct A { int foo; }; 3189 // struct B : A { using A::foo; }; 3190 // template <class T> struct C : A {}; 3191 // template <class T> struct D : C<T> { using B::foo; } // <--- 3192 // This is invalid (during instantiation) in C++03 because B::foo 3193 // resolves to the using decl in B, which is not a base class of D<T>. 3194 // We can't diagnose it immediately because C<T> is an unknown 3195 // specialization. The UsingShadowDecl in D<T> then points directly 3196 // to A::foo, which will look well-formed when we instantiate. 3197 // The right solution is to not collapse the shadow-decl chain. 3198 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3199 DeclContext *OrigDC = Orig->getDeclContext(); 3200 3201 // Handle enums and anonymous structs. 3202 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3203 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3204 while (OrigRec->isAnonymousStructOrUnion()) 3205 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3206 3207 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3208 if (OrigDC == CurContext) { 3209 Diag(Using->getLocation(), 3210 diag::err_using_decl_nested_name_specifier_is_current_class) 3211 << Using->getNestedNameRange(); 3212 Diag(Orig->getLocation(), diag::note_using_decl_target); 3213 return true; 3214 } 3215 3216 Diag(Using->getNestedNameRange().getBegin(), 3217 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3218 << Using->getTargetNestedNameDecl() 3219 << cast<CXXRecordDecl>(CurContext) 3220 << Using->getNestedNameRange(); 3221 Diag(Orig->getLocation(), diag::note_using_decl_target); 3222 return true; 3223 } 3224 } 3225 3226 if (Previous.empty()) return false; 3227 3228 NamedDecl *Target = Orig; 3229 if (isa<UsingShadowDecl>(Target)) 3230 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3231 3232 // If the target happens to be one of the previous declarations, we 3233 // don't have a conflict. 3234 // 3235 // FIXME: but we might be increasing its access, in which case we 3236 // should redeclare it. 3237 NamedDecl *NonTag = 0, *Tag = 0; 3238 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3239 I != E; ++I) { 3240 NamedDecl *D = (*I)->getUnderlyingDecl(); 3241 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3242 return false; 3243 3244 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3245 } 3246 3247 if (Target->isFunctionOrFunctionTemplate()) { 3248 FunctionDecl *FD; 3249 if (isa<FunctionTemplateDecl>(Target)) 3250 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3251 else 3252 FD = cast<FunctionDecl>(Target); 3253 3254 NamedDecl *OldDecl = 0; 3255 switch (CheckOverload(FD, Previous, OldDecl)) { 3256 case Ovl_Overload: 3257 return false; 3258 3259 case Ovl_NonFunction: 3260 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3261 break; 3262 3263 // We found a decl with the exact signature. 3264 case Ovl_Match: 3265 if (isa<UsingShadowDecl>(OldDecl)) { 3266 // Silently ignore the possible conflict. 3267 return false; 3268 } 3269 3270 // If we're in a record, we want to hide the target, so we 3271 // return true (without a diagnostic) to tell the caller not to 3272 // build a shadow decl. 3273 if (CurContext->isRecord()) 3274 return true; 3275 3276 // If we're not in a record, this is an error. 3277 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3278 break; 3279 } 3280 3281 Diag(Target->getLocation(), diag::note_using_decl_target); 3282 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3283 return true; 3284 } 3285 3286 // Target is not a function. 3287 3288 if (isa<TagDecl>(Target)) { 3289 // No conflict between a tag and a non-tag. 3290 if (!Tag) return false; 3291 3292 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3293 Diag(Target->getLocation(), diag::note_using_decl_target); 3294 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3295 return true; 3296 } 3297 3298 // No conflict between a tag and a non-tag. 3299 if (!NonTag) return false; 3300 3301 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3302 Diag(Target->getLocation(), diag::note_using_decl_target); 3303 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3304 return true; 3305} 3306 3307/// Builds a shadow declaration corresponding to a 'using' declaration. 3308UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3309 UsingDecl *UD, 3310 NamedDecl *Orig) { 3311 3312 // If we resolved to another shadow declaration, just coalesce them. 3313 NamedDecl *Target = Orig; 3314 if (isa<UsingShadowDecl>(Target)) { 3315 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3316 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3317 } 3318 3319 UsingShadowDecl *Shadow 3320 = UsingShadowDecl::Create(Context, CurContext, 3321 UD->getLocation(), UD, Target); 3322 UD->addShadowDecl(Shadow); 3323 3324 if (S) 3325 PushOnScopeChains(Shadow, S); 3326 else 3327 CurContext->addDecl(Shadow); 3328 Shadow->setAccess(UD->getAccess()); 3329 3330 // Register it as a conversion if appropriate. 3331 if (Shadow->getDeclName().getNameKind() 3332 == DeclarationName::CXXConversionFunctionName) 3333 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3334 3335 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3336 Shadow->setInvalidDecl(); 3337 3338 return Shadow; 3339} 3340 3341/// Hides a using shadow declaration. This is required by the current 3342/// using-decl implementation when a resolvable using declaration in a 3343/// class is followed by a declaration which would hide or override 3344/// one or more of the using decl's targets; for example: 3345/// 3346/// struct Base { void foo(int); }; 3347/// struct Derived : Base { 3348/// using Base::foo; 3349/// void foo(int); 3350/// }; 3351/// 3352/// The governing language is C++03 [namespace.udecl]p12: 3353/// 3354/// When a using-declaration brings names from a base class into a 3355/// derived class scope, member functions in the derived class 3356/// override and/or hide member functions with the same name and 3357/// parameter types in a base class (rather than conflicting). 3358/// 3359/// There are two ways to implement this: 3360/// (1) optimistically create shadow decls when they're not hidden 3361/// by existing declarations, or 3362/// (2) don't create any shadow decls (or at least don't make them 3363/// visible) until we've fully parsed/instantiated the class. 3364/// The problem with (1) is that we might have to retroactively remove 3365/// a shadow decl, which requires several O(n) operations because the 3366/// decl structures are (very reasonably) not designed for removal. 3367/// (2) avoids this but is very fiddly and phase-dependent. 3368void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3369 if (Shadow->getDeclName().getNameKind() == 3370 DeclarationName::CXXConversionFunctionName) 3371 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3372 3373 // Remove it from the DeclContext... 3374 Shadow->getDeclContext()->removeDecl(Shadow); 3375 3376 // ...and the scope, if applicable... 3377 if (S) { 3378 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3379 IdResolver.RemoveDecl(Shadow); 3380 } 3381 3382 // ...and the using decl. 3383 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3384 3385 // TODO: complain somehow if Shadow was used. It shouldn't 3386 // be possible for this to happen, because...? 3387} 3388 3389/// Builds a using declaration. 3390/// 3391/// \param IsInstantiation - Whether this call arises from an 3392/// instantiation of an unresolved using declaration. We treat 3393/// the lookup differently for these declarations. 3394NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3395 SourceLocation UsingLoc, 3396 const CXXScopeSpec &SS, 3397 SourceLocation IdentLoc, 3398 DeclarationName Name, 3399 AttributeList *AttrList, 3400 bool IsInstantiation, 3401 bool IsTypeName, 3402 SourceLocation TypenameLoc) { 3403 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3404 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3405 3406 // FIXME: We ignore attributes for now. 3407 delete AttrList; 3408 3409 if (SS.isEmpty()) { 3410 Diag(IdentLoc, diag::err_using_requires_qualname); 3411 return 0; 3412 } 3413 3414 // Do the redeclaration lookup in the current scope. 3415 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3416 ForRedeclaration); 3417 Previous.setHideTags(false); 3418 if (S) { 3419 LookupName(Previous, S); 3420 3421 // It is really dumb that we have to do this. 3422 LookupResult::Filter F = Previous.makeFilter(); 3423 while (F.hasNext()) { 3424 NamedDecl *D = F.next(); 3425 if (!isDeclInScope(D, CurContext, S)) 3426 F.erase(); 3427 } 3428 F.done(); 3429 } else { 3430 assert(IsInstantiation && "no scope in non-instantiation"); 3431 assert(CurContext->isRecord() && "scope not record in instantiation"); 3432 LookupQualifiedName(Previous, CurContext); 3433 } 3434 3435 NestedNameSpecifier *NNS = 3436 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3437 3438 // Check for invalid redeclarations. 3439 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3440 return 0; 3441 3442 // Check for bad qualifiers. 3443 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3444 return 0; 3445 3446 DeclContext *LookupContext = computeDeclContext(SS); 3447 NamedDecl *D; 3448 if (!LookupContext) { 3449 if (IsTypeName) { 3450 // FIXME: not all declaration name kinds are legal here 3451 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3452 UsingLoc, TypenameLoc, 3453 SS.getRange(), NNS, 3454 IdentLoc, Name); 3455 } else { 3456 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3457 UsingLoc, SS.getRange(), NNS, 3458 IdentLoc, Name); 3459 } 3460 } else { 3461 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3462 SS.getRange(), UsingLoc, NNS, Name, 3463 IsTypeName); 3464 } 3465 D->setAccess(AS); 3466 CurContext->addDecl(D); 3467 3468 if (!LookupContext) return D; 3469 UsingDecl *UD = cast<UsingDecl>(D); 3470 3471 if (RequireCompleteDeclContext(SS)) { 3472 UD->setInvalidDecl(); 3473 return UD; 3474 } 3475 3476 // Look up the target name. 3477 3478 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3479 3480 // Unlike most lookups, we don't always want to hide tag 3481 // declarations: tag names are visible through the using declaration 3482 // even if hidden by ordinary names, *except* in a dependent context 3483 // where it's important for the sanity of two-phase lookup. 3484 if (!IsInstantiation) 3485 R.setHideTags(false); 3486 3487 LookupQualifiedName(R, LookupContext); 3488 3489 if (R.empty()) { 3490 Diag(IdentLoc, diag::err_no_member) 3491 << Name << LookupContext << SS.getRange(); 3492 UD->setInvalidDecl(); 3493 return UD; 3494 } 3495 3496 if (R.isAmbiguous()) { 3497 UD->setInvalidDecl(); 3498 return UD; 3499 } 3500 3501 if (IsTypeName) { 3502 // If we asked for a typename and got a non-type decl, error out. 3503 if (!R.getAsSingle<TypeDecl>()) { 3504 Diag(IdentLoc, diag::err_using_typename_non_type); 3505 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3506 Diag((*I)->getUnderlyingDecl()->getLocation(), 3507 diag::note_using_decl_target); 3508 UD->setInvalidDecl(); 3509 return UD; 3510 } 3511 } else { 3512 // If we asked for a non-typename and we got a type, error out, 3513 // but only if this is an instantiation of an unresolved using 3514 // decl. Otherwise just silently find the type name. 3515 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3516 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3517 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3518 UD->setInvalidDecl(); 3519 return UD; 3520 } 3521 } 3522 3523 // C++0x N2914 [namespace.udecl]p6: 3524 // A using-declaration shall not name a namespace. 3525 if (R.getAsSingle<NamespaceDecl>()) { 3526 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3527 << SS.getRange(); 3528 UD->setInvalidDecl(); 3529 return UD; 3530 } 3531 3532 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3533 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3534 BuildUsingShadowDecl(S, UD, *I); 3535 } 3536 3537 return UD; 3538} 3539 3540/// Checks that the given using declaration is not an invalid 3541/// redeclaration. Note that this is checking only for the using decl 3542/// itself, not for any ill-formedness among the UsingShadowDecls. 3543bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3544 bool isTypeName, 3545 const CXXScopeSpec &SS, 3546 SourceLocation NameLoc, 3547 const LookupResult &Prev) { 3548 // C++03 [namespace.udecl]p8: 3549 // C++0x [namespace.udecl]p10: 3550 // A using-declaration is a declaration and can therefore be used 3551 // repeatedly where (and only where) multiple declarations are 3552 // allowed. 3553 // That's only in file contexts. 3554 if (CurContext->getLookupContext()->isFileContext()) 3555 return false; 3556 3557 NestedNameSpecifier *Qual 3558 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3559 3560 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3561 NamedDecl *D = *I; 3562 3563 bool DTypename; 3564 NestedNameSpecifier *DQual; 3565 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3566 DTypename = UD->isTypeName(); 3567 DQual = UD->getTargetNestedNameDecl(); 3568 } else if (UnresolvedUsingValueDecl *UD 3569 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3570 DTypename = false; 3571 DQual = UD->getTargetNestedNameSpecifier(); 3572 } else if (UnresolvedUsingTypenameDecl *UD 3573 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3574 DTypename = true; 3575 DQual = UD->getTargetNestedNameSpecifier(); 3576 } else continue; 3577 3578 // using decls differ if one says 'typename' and the other doesn't. 3579 // FIXME: non-dependent using decls? 3580 if (isTypeName != DTypename) continue; 3581 3582 // using decls differ if they name different scopes (but note that 3583 // template instantiation can cause this check to trigger when it 3584 // didn't before instantiation). 3585 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3586 Context.getCanonicalNestedNameSpecifier(DQual)) 3587 continue; 3588 3589 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3590 Diag(D->getLocation(), diag::note_using_decl) << 1; 3591 return true; 3592 } 3593 3594 return false; 3595} 3596 3597 3598/// Checks that the given nested-name qualifier used in a using decl 3599/// in the current context is appropriately related to the current 3600/// scope. If an error is found, diagnoses it and returns true. 3601bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3602 const CXXScopeSpec &SS, 3603 SourceLocation NameLoc) { 3604 DeclContext *NamedContext = computeDeclContext(SS); 3605 3606 if (!CurContext->isRecord()) { 3607 // C++03 [namespace.udecl]p3: 3608 // C++0x [namespace.udecl]p8: 3609 // A using-declaration for a class member shall be a member-declaration. 3610 3611 // If we weren't able to compute a valid scope, it must be a 3612 // dependent class scope. 3613 if (!NamedContext || NamedContext->isRecord()) { 3614 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3615 << SS.getRange(); 3616 return true; 3617 } 3618 3619 // Otherwise, everything is known to be fine. 3620 return false; 3621 } 3622 3623 // The current scope is a record. 3624 3625 // If the named context is dependent, we can't decide much. 3626 if (!NamedContext) { 3627 // FIXME: in C++0x, we can diagnose if we can prove that the 3628 // nested-name-specifier does not refer to a base class, which is 3629 // still possible in some cases. 3630 3631 // Otherwise we have to conservatively report that things might be 3632 // okay. 3633 return false; 3634 } 3635 3636 if (!NamedContext->isRecord()) { 3637 // Ideally this would point at the last name in the specifier, 3638 // but we don't have that level of source info. 3639 Diag(SS.getRange().getBegin(), 3640 diag::err_using_decl_nested_name_specifier_is_not_class) 3641 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3642 return true; 3643 } 3644 3645 if (getLangOptions().CPlusPlus0x) { 3646 // C++0x [namespace.udecl]p3: 3647 // In a using-declaration used as a member-declaration, the 3648 // nested-name-specifier shall name a base class of the class 3649 // being defined. 3650 3651 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3652 cast<CXXRecordDecl>(NamedContext))) { 3653 if (CurContext == NamedContext) { 3654 Diag(NameLoc, 3655 diag::err_using_decl_nested_name_specifier_is_current_class) 3656 << SS.getRange(); 3657 return true; 3658 } 3659 3660 Diag(SS.getRange().getBegin(), 3661 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3662 << (NestedNameSpecifier*) SS.getScopeRep() 3663 << cast<CXXRecordDecl>(CurContext) 3664 << SS.getRange(); 3665 return true; 3666 } 3667 3668 return false; 3669 } 3670 3671 // C++03 [namespace.udecl]p4: 3672 // A using-declaration used as a member-declaration shall refer 3673 // to a member of a base class of the class being defined [etc.]. 3674 3675 // Salient point: SS doesn't have to name a base class as long as 3676 // lookup only finds members from base classes. Therefore we can 3677 // diagnose here only if we can prove that that can't happen, 3678 // i.e. if the class hierarchies provably don't intersect. 3679 3680 // TODO: it would be nice if "definitely valid" results were cached 3681 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3682 // need to be repeated. 3683 3684 struct UserData { 3685 llvm::DenseSet<const CXXRecordDecl*> Bases; 3686 3687 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3688 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3689 Data->Bases.insert(Base); 3690 return true; 3691 } 3692 3693 bool hasDependentBases(const CXXRecordDecl *Class) { 3694 return !Class->forallBases(collect, this); 3695 } 3696 3697 /// Returns true if the base is dependent or is one of the 3698 /// accumulated base classes. 3699 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3700 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3701 return !Data->Bases.count(Base); 3702 } 3703 3704 bool mightShareBases(const CXXRecordDecl *Class) { 3705 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3706 } 3707 }; 3708 3709 UserData Data; 3710 3711 // Returns false if we find a dependent base. 3712 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3713 return false; 3714 3715 // Returns false if the class has a dependent base or if it or one 3716 // of its bases is present in the base set of the current context. 3717 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3718 return false; 3719 3720 Diag(SS.getRange().getBegin(), 3721 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3722 << (NestedNameSpecifier*) SS.getScopeRep() 3723 << cast<CXXRecordDecl>(CurContext) 3724 << SS.getRange(); 3725 3726 return true; 3727} 3728 3729Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3730 SourceLocation NamespaceLoc, 3731 SourceLocation AliasLoc, 3732 IdentifierInfo *Alias, 3733 const CXXScopeSpec &SS, 3734 SourceLocation IdentLoc, 3735 IdentifierInfo *Ident) { 3736 3737 // Lookup the namespace name. 3738 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3739 LookupParsedName(R, S, &SS); 3740 3741 // Check if we have a previous declaration with the same name. 3742 if (NamedDecl *PrevDecl 3743 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3744 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3745 // We already have an alias with the same name that points to the same 3746 // namespace, so don't create a new one. 3747 // FIXME: At some point, we'll want to create the (redundant) 3748 // declaration to maintain better source information. 3749 if (!R.isAmbiguous() && !R.empty() && 3750 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3751 return DeclPtrTy(); 3752 } 3753 3754 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3755 diag::err_redefinition_different_kind; 3756 Diag(AliasLoc, DiagID) << Alias; 3757 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3758 return DeclPtrTy(); 3759 } 3760 3761 if (R.isAmbiguous()) 3762 return DeclPtrTy(); 3763 3764 if (R.empty()) { 3765 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3766 return DeclPtrTy(); 3767 } 3768 3769 NamespaceAliasDecl *AliasDecl = 3770 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3771 Alias, SS.getRange(), 3772 (NestedNameSpecifier *)SS.getScopeRep(), 3773 IdentLoc, R.getFoundDecl()); 3774 3775 PushOnScopeChains(AliasDecl, S); 3776 return DeclPtrTy::make(AliasDecl); 3777} 3778 3779void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3780 CXXConstructorDecl *Constructor) { 3781 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3782 !Constructor->isUsed()) && 3783 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3784 3785 CXXRecordDecl *ClassDecl 3786 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3787 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3788 3789 DeclContext *PreviousContext = CurContext; 3790 CurContext = Constructor; 3791 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3792 Diag(CurrentLocation, diag::note_member_synthesized_at) 3793 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3794 Constructor->setInvalidDecl(); 3795 } else { 3796 Constructor->setUsed(); 3797 } 3798 CurContext = PreviousContext; 3799} 3800 3801void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3802 CXXDestructorDecl *Destructor) { 3803 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3804 "DefineImplicitDestructor - call it for implicit default dtor"); 3805 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3806 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3807 3808 DeclContext *PreviousContext = CurContext; 3809 CurContext = Destructor; 3810 3811 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3812 Destructor->getParent()); 3813 3814 // FIXME: If CheckDestructor fails, we should emit a note about where the 3815 // implicit destructor was needed. 3816 if (CheckDestructor(Destructor)) { 3817 Diag(CurrentLocation, diag::note_member_synthesized_at) 3818 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3819 3820 Destructor->setInvalidDecl(); 3821 CurContext = PreviousContext; 3822 3823 return; 3824 } 3825 CurContext = PreviousContext; 3826 3827 Destructor->setUsed(); 3828} 3829 3830void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3831 CXXMethodDecl *MethodDecl) { 3832 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3833 MethodDecl->getOverloadedOperator() == OO_Equal && 3834 !MethodDecl->isUsed()) && 3835 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3836 3837 CXXRecordDecl *ClassDecl 3838 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3839 3840 DeclContext *PreviousContext = CurContext; 3841 CurContext = MethodDecl; 3842 3843 // C++[class.copy] p12 3844 // Before the implicitly-declared copy assignment operator for a class is 3845 // implicitly defined, all implicitly-declared copy assignment operators 3846 // for its direct base classes and its nonstatic data members shall have 3847 // been implicitly defined. 3848 bool err = false; 3849 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3850 E = ClassDecl->bases_end(); Base != E; ++Base) { 3851 CXXRecordDecl *BaseClassDecl 3852 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3853 if (CXXMethodDecl *BaseAssignOpMethod = 3854 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3855 BaseClassDecl)) { 3856 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3857 BaseAssignOpMethod, 3858 PDiag(diag::err_access_assign_base) 3859 << Base->getType()); 3860 3861 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3862 } 3863 } 3864 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3865 E = ClassDecl->field_end(); Field != E; ++Field) { 3866 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3867 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3868 FieldType = Array->getElementType(); 3869 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3870 CXXRecordDecl *FieldClassDecl 3871 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3872 if (CXXMethodDecl *FieldAssignOpMethod = 3873 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3874 FieldClassDecl)) { 3875 CheckDirectMemberAccess(Field->getLocation(), 3876 FieldAssignOpMethod, 3877 PDiag(diag::err_access_assign_field) 3878 << Field->getDeclName() << Field->getType()); 3879 3880 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3881 } 3882 } else if (FieldType->isReferenceType()) { 3883 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3884 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3885 Diag(Field->getLocation(), diag::note_declared_at); 3886 Diag(CurrentLocation, diag::note_first_required_here); 3887 err = true; 3888 } else if (FieldType.isConstQualified()) { 3889 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3890 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3891 Diag(Field->getLocation(), diag::note_declared_at); 3892 Diag(CurrentLocation, diag::note_first_required_here); 3893 err = true; 3894 } 3895 } 3896 if (!err) 3897 MethodDecl->setUsed(); 3898 3899 CurContext = PreviousContext; 3900} 3901 3902CXXMethodDecl * 3903Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3904 ParmVarDecl *ParmDecl, 3905 CXXRecordDecl *ClassDecl) { 3906 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3907 QualType RHSType(LHSType); 3908 // If class's assignment operator argument is const/volatile qualified, 3909 // look for operator = (const/volatile B&). Otherwise, look for 3910 // operator = (B&). 3911 RHSType = Context.getCVRQualifiedType(RHSType, 3912 ParmDecl->getType().getCVRQualifiers()); 3913 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3914 LHSType, 3915 SourceLocation())); 3916 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3917 RHSType, 3918 CurrentLocation)); 3919 Expr *Args[2] = { &*LHS, &*RHS }; 3920 OverloadCandidateSet CandidateSet(CurrentLocation); 3921 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3922 CandidateSet); 3923 OverloadCandidateSet::iterator Best; 3924 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3925 return cast<CXXMethodDecl>(Best->Function); 3926 assert(false && 3927 "getAssignOperatorMethod - copy assignment operator method not found"); 3928 return 0; 3929} 3930 3931void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3932 CXXConstructorDecl *CopyConstructor, 3933 unsigned TypeQuals) { 3934 assert((CopyConstructor->isImplicit() && 3935 CopyConstructor->isCopyConstructor(TypeQuals) && 3936 !CopyConstructor->isUsed()) && 3937 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3938 3939 CXXRecordDecl *ClassDecl 3940 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3941 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3942 3943 DeclContext *PreviousContext = CurContext; 3944 CurContext = CopyConstructor; 3945 3946 // C++ [class.copy] p209 3947 // Before the implicitly-declared copy constructor for a class is 3948 // implicitly defined, all the implicitly-declared copy constructors 3949 // for its base class and its non-static data members shall have been 3950 // implicitly defined. 3951 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3952 Base != ClassDecl->bases_end(); ++Base) { 3953 CXXRecordDecl *BaseClassDecl 3954 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3955 if (CXXConstructorDecl *BaseCopyCtor = 3956 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3957 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3958 BaseCopyCtor, 3959 PDiag(diag::err_access_copy_base) 3960 << Base->getType()); 3961 3962 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3963 } 3964 } 3965 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3966 FieldEnd = ClassDecl->field_end(); 3967 Field != FieldEnd; ++Field) { 3968 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3969 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3970 FieldType = Array->getElementType(); 3971 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3972 CXXRecordDecl *FieldClassDecl 3973 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3974 if (CXXConstructorDecl *FieldCopyCtor = 3975 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 3976 CheckDirectMemberAccess(Field->getLocation(), 3977 FieldCopyCtor, 3978 PDiag(diag::err_access_copy_field) 3979 << Field->getDeclName() << Field->getType()); 3980 3981 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3982 } 3983 } 3984 } 3985 CopyConstructor->setUsed(); 3986 3987 CurContext = PreviousContext; 3988} 3989 3990Sema::OwningExprResult 3991Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3992 CXXConstructorDecl *Constructor, 3993 MultiExprArg ExprArgs, 3994 bool RequiresZeroInit, 3995 bool BaseInitialization) { 3996 bool Elidable = false; 3997 3998 // C++ [class.copy]p15: 3999 // Whenever a temporary class object is copied using a copy constructor, and 4000 // this object and the copy have the same cv-unqualified type, an 4001 // implementation is permitted to treat the original and the copy as two 4002 // different ways of referring to the same object and not perform a copy at 4003 // all, even if the class copy constructor or destructor have side effects. 4004 4005 // FIXME: Is this enough? 4006 if (Constructor->isCopyConstructor()) { 4007 Expr *E = ((Expr **)ExprArgs.get())[0]; 4008 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4009 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4010 E = ICE->getSubExpr(); 4011 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 4012 E = FCE->getSubExpr(); 4013 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 4014 E = BE->getSubExpr(); 4015 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4016 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4017 E = ICE->getSubExpr(); 4018 4019 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 4020 Elidable = !CE->getCallReturnType()->isReferenceType(); 4021 else if (isa<CXXTemporaryObjectExpr>(E)) 4022 Elidable = true; 4023 else if (isa<CXXConstructExpr>(E)) 4024 Elidable = true; 4025 } 4026 4027 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4028 Elidable, move(ExprArgs), RequiresZeroInit, 4029 BaseInitialization); 4030} 4031 4032/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4033/// including handling of its default argument expressions. 4034Sema::OwningExprResult 4035Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4036 CXXConstructorDecl *Constructor, bool Elidable, 4037 MultiExprArg ExprArgs, 4038 bool RequiresZeroInit, 4039 bool BaseInitialization) { 4040 unsigned NumExprs = ExprArgs.size(); 4041 Expr **Exprs = (Expr **)ExprArgs.release(); 4042 4043 MarkDeclarationReferenced(ConstructLoc, Constructor); 4044 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4045 Constructor, Elidable, Exprs, NumExprs, 4046 RequiresZeroInit, BaseInitialization)); 4047} 4048 4049bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4050 CXXConstructorDecl *Constructor, 4051 MultiExprArg Exprs) { 4052 OwningExprResult TempResult = 4053 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4054 move(Exprs)); 4055 if (TempResult.isInvalid()) 4056 return true; 4057 4058 Expr *Temp = TempResult.takeAs<Expr>(); 4059 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4060 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4061 VD->setInit(Temp); 4062 4063 return false; 4064} 4065 4066void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4067 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4068 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4069 !ClassDecl->hasTrivialDestructor()) { 4070 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4071 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4072 CheckDestructorAccess(VD->getLocation(), Destructor, 4073 PDiag(diag::err_access_dtor_var) 4074 << VD->getDeclName() 4075 << VD->getType()); 4076 } 4077} 4078 4079/// AddCXXDirectInitializerToDecl - This action is called immediately after 4080/// ActOnDeclarator, when a C++ direct initializer is present. 4081/// e.g: "int x(1);" 4082void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4083 SourceLocation LParenLoc, 4084 MultiExprArg Exprs, 4085 SourceLocation *CommaLocs, 4086 SourceLocation RParenLoc) { 4087 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4088 Decl *RealDecl = Dcl.getAs<Decl>(); 4089 4090 // If there is no declaration, there was an error parsing it. Just ignore 4091 // the initializer. 4092 if (RealDecl == 0) 4093 return; 4094 4095 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4096 if (!VDecl) { 4097 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4098 RealDecl->setInvalidDecl(); 4099 return; 4100 } 4101 4102 // We will represent direct-initialization similarly to copy-initialization: 4103 // int x(1); -as-> int x = 1; 4104 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4105 // 4106 // Clients that want to distinguish between the two forms, can check for 4107 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4108 // A major benefit is that clients that don't particularly care about which 4109 // exactly form was it (like the CodeGen) can handle both cases without 4110 // special case code. 4111 4112 // C++ 8.5p11: 4113 // The form of initialization (using parentheses or '=') is generally 4114 // insignificant, but does matter when the entity being initialized has a 4115 // class type. 4116 QualType DeclInitType = VDecl->getType(); 4117 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4118 DeclInitType = Context.getBaseElementType(Array); 4119 4120 if (!VDecl->getType()->isDependentType() && 4121 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4122 diag::err_typecheck_decl_incomplete_type)) { 4123 VDecl->setInvalidDecl(); 4124 return; 4125 } 4126 4127 // The variable can not have an abstract class type. 4128 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4129 diag::err_abstract_type_in_decl, 4130 AbstractVariableType)) 4131 VDecl->setInvalidDecl(); 4132 4133 const VarDecl *Def; 4134 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4135 Diag(VDecl->getLocation(), diag::err_redefinition) 4136 << VDecl->getDeclName(); 4137 Diag(Def->getLocation(), diag::note_previous_definition); 4138 VDecl->setInvalidDecl(); 4139 return; 4140 } 4141 4142 // If either the declaration has a dependent type or if any of the 4143 // expressions is type-dependent, we represent the initialization 4144 // via a ParenListExpr for later use during template instantiation. 4145 if (VDecl->getType()->isDependentType() || 4146 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4147 // Let clients know that initialization was done with a direct initializer. 4148 VDecl->setCXXDirectInitializer(true); 4149 4150 // Store the initialization expressions as a ParenListExpr. 4151 unsigned NumExprs = Exprs.size(); 4152 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4153 (Expr **)Exprs.release(), 4154 NumExprs, RParenLoc)); 4155 return; 4156 } 4157 4158 // Capture the variable that is being initialized and the style of 4159 // initialization. 4160 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4161 4162 // FIXME: Poor source location information. 4163 InitializationKind Kind 4164 = InitializationKind::CreateDirect(VDecl->getLocation(), 4165 LParenLoc, RParenLoc); 4166 4167 InitializationSequence InitSeq(*this, Entity, Kind, 4168 (Expr**)Exprs.get(), Exprs.size()); 4169 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4170 if (Result.isInvalid()) { 4171 VDecl->setInvalidDecl(); 4172 return; 4173 } 4174 4175 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4176 VDecl->setInit(Result.takeAs<Expr>()); 4177 VDecl->setCXXDirectInitializer(true); 4178 4179 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4180 FinalizeVarWithDestructor(VDecl, Record); 4181} 4182 4183/// \brief Add the applicable constructor candidates for an initialization 4184/// by constructor. 4185static void AddConstructorInitializationCandidates(Sema &SemaRef, 4186 QualType ClassType, 4187 Expr **Args, 4188 unsigned NumArgs, 4189 InitializationKind Kind, 4190 OverloadCandidateSet &CandidateSet) { 4191 // C++ [dcl.init]p14: 4192 // If the initialization is direct-initialization, or if it is 4193 // copy-initialization where the cv-unqualified version of the 4194 // source type is the same class as, or a derived class of, the 4195 // class of the destination, constructors are considered. The 4196 // applicable constructors are enumerated (13.3.1.3), and the 4197 // best one is chosen through overload resolution (13.3). The 4198 // constructor so selected is called to initialize the object, 4199 // with the initializer expression(s) as its argument(s). If no 4200 // constructor applies, or the overload resolution is ambiguous, 4201 // the initialization is ill-formed. 4202 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4203 assert(ClassRec && "Can only initialize a class type here"); 4204 4205 // FIXME: When we decide not to synthesize the implicitly-declared 4206 // constructors, we'll need to make them appear here. 4207 4208 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4209 DeclarationName ConstructorName 4210 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4211 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4212 DeclContext::lookup_const_iterator Con, ConEnd; 4213 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4214 Con != ConEnd; ++Con) { 4215 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4216 4217 // Find the constructor (which may be a template). 4218 CXXConstructorDecl *Constructor = 0; 4219 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4220 if (ConstructorTmpl) 4221 Constructor 4222 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4223 else 4224 Constructor = cast<CXXConstructorDecl>(*Con); 4225 4226 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4227 (Kind.getKind() == InitializationKind::IK_Value) || 4228 (Kind.getKind() == InitializationKind::IK_Copy && 4229 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4230 ((Kind.getKind() == InitializationKind::IK_Default) && 4231 Constructor->isDefaultConstructor())) { 4232 if (ConstructorTmpl) 4233 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4234 /*ExplicitArgs*/ 0, 4235 Args, NumArgs, CandidateSet); 4236 else 4237 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4238 Args, NumArgs, CandidateSet); 4239 } 4240 } 4241} 4242 4243/// \brief Attempt to perform initialization by constructor 4244/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4245/// copy-initialization. 4246/// 4247/// This routine determines whether initialization by constructor is possible, 4248/// but it does not emit any diagnostics in the case where the initialization 4249/// is ill-formed. 4250/// 4251/// \param ClassType the type of the object being initialized, which must have 4252/// class type. 4253/// 4254/// \param Args the arguments provided to initialize the object 4255/// 4256/// \param NumArgs the number of arguments provided to initialize the object 4257/// 4258/// \param Kind the type of initialization being performed 4259/// 4260/// \returns the constructor used to initialize the object, if successful. 4261/// Otherwise, emits a diagnostic and returns NULL. 4262CXXConstructorDecl * 4263Sema::TryInitializationByConstructor(QualType ClassType, 4264 Expr **Args, unsigned NumArgs, 4265 SourceLocation Loc, 4266 InitializationKind Kind) { 4267 // Build the overload candidate set 4268 OverloadCandidateSet CandidateSet(Loc); 4269 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4270 CandidateSet); 4271 4272 // Determine whether we found a constructor we can use. 4273 OverloadCandidateSet::iterator Best; 4274 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4275 case OR_Success: 4276 case OR_Deleted: 4277 // We found a constructor. Return it. 4278 return cast<CXXConstructorDecl>(Best->Function); 4279 4280 case OR_No_Viable_Function: 4281 case OR_Ambiguous: 4282 // Overload resolution failed. Return nothing. 4283 return 0; 4284 } 4285 4286 // Silence GCC warning 4287 return 0; 4288} 4289 4290/// \brief Given a constructor and the set of arguments provided for the 4291/// constructor, convert the arguments and add any required default arguments 4292/// to form a proper call to this constructor. 4293/// 4294/// \returns true if an error occurred, false otherwise. 4295bool 4296Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4297 MultiExprArg ArgsPtr, 4298 SourceLocation Loc, 4299 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4300 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4301 unsigned NumArgs = ArgsPtr.size(); 4302 Expr **Args = (Expr **)ArgsPtr.get(); 4303 4304 const FunctionProtoType *Proto 4305 = Constructor->getType()->getAs<FunctionProtoType>(); 4306 assert(Proto && "Constructor without a prototype?"); 4307 unsigned NumArgsInProto = Proto->getNumArgs(); 4308 4309 // If too few arguments are available, we'll fill in the rest with defaults. 4310 if (NumArgs < NumArgsInProto) 4311 ConvertedArgs.reserve(NumArgsInProto); 4312 else 4313 ConvertedArgs.reserve(NumArgs); 4314 4315 VariadicCallType CallType = 4316 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4317 llvm::SmallVector<Expr *, 8> AllArgs; 4318 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4319 Proto, 0, Args, NumArgs, AllArgs, 4320 CallType); 4321 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4322 ConvertedArgs.push_back(AllArgs[i]); 4323 return Invalid; 4324} 4325 4326/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4327/// determine whether they are reference-related, 4328/// reference-compatible, reference-compatible with added 4329/// qualification, or incompatible, for use in C++ initialization by 4330/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4331/// type, and the first type (T1) is the pointee type of the reference 4332/// type being initialized. 4333Sema::ReferenceCompareResult 4334Sema::CompareReferenceRelationship(SourceLocation Loc, 4335 QualType OrigT1, QualType OrigT2, 4336 bool& DerivedToBase) { 4337 assert(!OrigT1->isReferenceType() && 4338 "T1 must be the pointee type of the reference type"); 4339 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4340 4341 QualType T1 = Context.getCanonicalType(OrigT1); 4342 QualType T2 = Context.getCanonicalType(OrigT2); 4343 Qualifiers T1Quals, T2Quals; 4344 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4345 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4346 4347 // C++ [dcl.init.ref]p4: 4348 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4349 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4350 // T1 is a base class of T2. 4351 if (UnqualT1 == UnqualT2) 4352 DerivedToBase = false; 4353 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4354 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4355 IsDerivedFrom(UnqualT2, UnqualT1)) 4356 DerivedToBase = true; 4357 else 4358 return Ref_Incompatible; 4359 4360 // At this point, we know that T1 and T2 are reference-related (at 4361 // least). 4362 4363 // If the type is an array type, promote the element qualifiers to the type 4364 // for comparison. 4365 if (isa<ArrayType>(T1) && T1Quals) 4366 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4367 if (isa<ArrayType>(T2) && T2Quals) 4368 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4369 4370 // C++ [dcl.init.ref]p4: 4371 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4372 // reference-related to T2 and cv1 is the same cv-qualification 4373 // as, or greater cv-qualification than, cv2. For purposes of 4374 // overload resolution, cases for which cv1 is greater 4375 // cv-qualification than cv2 are identified as 4376 // reference-compatible with added qualification (see 13.3.3.2). 4377 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4378 return Ref_Compatible; 4379 else if (T1.isMoreQualifiedThan(T2)) 4380 return Ref_Compatible_With_Added_Qualification; 4381 else 4382 return Ref_Related; 4383} 4384 4385/// CheckReferenceInit - Check the initialization of a reference 4386/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4387/// the initializer (either a simple initializer or an initializer 4388/// list), and DeclType is the type of the declaration. When ICS is 4389/// non-null, this routine will compute the implicit conversion 4390/// sequence according to C++ [over.ics.ref] and will not produce any 4391/// diagnostics; when ICS is null, it will emit diagnostics when any 4392/// errors are found. Either way, a return value of true indicates 4393/// that there was a failure, a return value of false indicates that 4394/// the reference initialization succeeded. 4395/// 4396/// When @p SuppressUserConversions, user-defined conversions are 4397/// suppressed. 4398/// When @p AllowExplicit, we also permit explicit user-defined 4399/// conversion functions. 4400/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4401/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4402/// This is used when this is called from a C-style cast. 4403bool 4404Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4405 SourceLocation DeclLoc, 4406 bool SuppressUserConversions, 4407 bool AllowExplicit, bool ForceRValue, 4408 ImplicitConversionSequence *ICS, 4409 bool IgnoreBaseAccess) { 4410 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4411 4412 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4413 QualType T2 = Init->getType(); 4414 4415 // If the initializer is the address of an overloaded function, try 4416 // to resolve the overloaded function. If all goes well, T2 is the 4417 // type of the resulting function. 4418 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4419 DeclAccessPair Found; 4420 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4421 ICS != 0, Found); 4422 if (Fn) { 4423 // Since we're performing this reference-initialization for 4424 // real, update the initializer with the resulting function. 4425 if (!ICS) { 4426 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4427 return true; 4428 4429 CheckAddressOfMemberAccess(Init, Found); 4430 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4431 } 4432 4433 T2 = Fn->getType(); 4434 } 4435 } 4436 4437 // Compute some basic properties of the types and the initializer. 4438 bool isRValRef = DeclType->isRValueReferenceType(); 4439 bool DerivedToBase = false; 4440 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4441 Init->isLvalue(Context); 4442 ReferenceCompareResult RefRelationship 4443 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4444 4445 // Most paths end in a failed conversion. 4446 if (ICS) { 4447 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4448 } 4449 4450 // C++ [dcl.init.ref]p5: 4451 // A reference to type "cv1 T1" is initialized by an expression 4452 // of type "cv2 T2" as follows: 4453 4454 // -- If the initializer expression 4455 4456 // Rvalue references cannot bind to lvalues (N2812). 4457 // There is absolutely no situation where they can. In particular, note that 4458 // this is ill-formed, even if B has a user-defined conversion to A&&: 4459 // B b; 4460 // A&& r = b; 4461 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4462 if (!ICS) 4463 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4464 << Init->getSourceRange(); 4465 return true; 4466 } 4467 4468 bool BindsDirectly = false; 4469 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4470 // reference-compatible with "cv2 T2," or 4471 // 4472 // Note that the bit-field check is skipped if we are just computing 4473 // the implicit conversion sequence (C++ [over.best.ics]p2). 4474 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4475 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4476 BindsDirectly = true; 4477 4478 if (ICS) { 4479 // C++ [over.ics.ref]p1: 4480 // When a parameter of reference type binds directly (8.5.3) 4481 // to an argument expression, the implicit conversion sequence 4482 // is the identity conversion, unless the argument expression 4483 // has a type that is a derived class of the parameter type, 4484 // in which case the implicit conversion sequence is a 4485 // derived-to-base Conversion (13.3.3.1). 4486 ICS->setStandard(); 4487 ICS->Standard.First = ICK_Identity; 4488 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4489 ICS->Standard.Third = ICK_Identity; 4490 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4491 ICS->Standard.setToType(0, T2); 4492 ICS->Standard.setToType(1, T1); 4493 ICS->Standard.setToType(2, T1); 4494 ICS->Standard.ReferenceBinding = true; 4495 ICS->Standard.DirectBinding = true; 4496 ICS->Standard.RRefBinding = false; 4497 ICS->Standard.CopyConstructor = 0; 4498 4499 // Nothing more to do: the inaccessibility/ambiguity check for 4500 // derived-to-base conversions is suppressed when we're 4501 // computing the implicit conversion sequence (C++ 4502 // [over.best.ics]p2). 4503 return false; 4504 } else { 4505 // Perform the conversion. 4506 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4507 if (DerivedToBase) 4508 CK = CastExpr::CK_DerivedToBase; 4509 else if(CheckExceptionSpecCompatibility(Init, T1)) 4510 return true; 4511 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4512 } 4513 } 4514 4515 // -- has a class type (i.e., T2 is a class type) and can be 4516 // implicitly converted to an lvalue of type "cv3 T3," 4517 // where "cv1 T1" is reference-compatible with "cv3 T3" 4518 // 92) (this conversion is selected by enumerating the 4519 // applicable conversion functions (13.3.1.6) and choosing 4520 // the best one through overload resolution (13.3)), 4521 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4522 !RequireCompleteType(DeclLoc, T2, 0)) { 4523 CXXRecordDecl *T2RecordDecl 4524 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4525 4526 OverloadCandidateSet CandidateSet(DeclLoc); 4527 const UnresolvedSetImpl *Conversions 4528 = T2RecordDecl->getVisibleConversionFunctions(); 4529 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4530 E = Conversions->end(); I != E; ++I) { 4531 NamedDecl *D = *I; 4532 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4533 if (isa<UsingShadowDecl>(D)) 4534 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4535 4536 FunctionTemplateDecl *ConvTemplate 4537 = dyn_cast<FunctionTemplateDecl>(D); 4538 CXXConversionDecl *Conv; 4539 if (ConvTemplate) 4540 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4541 else 4542 Conv = cast<CXXConversionDecl>(D); 4543 4544 // If the conversion function doesn't return a reference type, 4545 // it can't be considered for this conversion. 4546 if (Conv->getConversionType()->isLValueReferenceType() && 4547 (AllowExplicit || !Conv->isExplicit())) { 4548 if (ConvTemplate) 4549 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4550 Init, DeclType, CandidateSet); 4551 else 4552 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4553 DeclType, CandidateSet); 4554 } 4555 } 4556 4557 OverloadCandidateSet::iterator Best; 4558 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4559 case OR_Success: 4560 // C++ [over.ics.ref]p1: 4561 // 4562 // [...] If the parameter binds directly to the result of 4563 // applying a conversion function to the argument 4564 // expression, the implicit conversion sequence is a 4565 // user-defined conversion sequence (13.3.3.1.2), with the 4566 // second standard conversion sequence either an identity 4567 // conversion or, if the conversion function returns an 4568 // entity of a type that is a derived class of the parameter 4569 // type, a derived-to-base Conversion. 4570 if (!Best->FinalConversion.DirectBinding) 4571 break; 4572 4573 // This is a direct binding. 4574 BindsDirectly = true; 4575 4576 if (ICS) { 4577 ICS->setUserDefined(); 4578 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4579 ICS->UserDefined.After = Best->FinalConversion; 4580 ICS->UserDefined.ConversionFunction = Best->Function; 4581 ICS->UserDefined.EllipsisConversion = false; 4582 assert(ICS->UserDefined.After.ReferenceBinding && 4583 ICS->UserDefined.After.DirectBinding && 4584 "Expected a direct reference binding!"); 4585 return false; 4586 } else { 4587 OwningExprResult InitConversion = 4588 BuildCXXCastArgument(DeclLoc, QualType(), 4589 CastExpr::CK_UserDefinedConversion, 4590 cast<CXXMethodDecl>(Best->Function), 4591 Owned(Init)); 4592 Init = InitConversion.takeAs<Expr>(); 4593 4594 if (CheckExceptionSpecCompatibility(Init, T1)) 4595 return true; 4596 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4597 /*isLvalue=*/true); 4598 } 4599 break; 4600 4601 case OR_Ambiguous: 4602 if (ICS) { 4603 ICS->setAmbiguous(); 4604 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4605 Cand != CandidateSet.end(); ++Cand) 4606 if (Cand->Viable) 4607 ICS->Ambiguous.addConversion(Cand->Function); 4608 break; 4609 } 4610 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4611 << Init->getSourceRange(); 4612 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4613 return true; 4614 4615 case OR_No_Viable_Function: 4616 case OR_Deleted: 4617 // There was no suitable conversion, or we found a deleted 4618 // conversion; continue with other checks. 4619 break; 4620 } 4621 } 4622 4623 if (BindsDirectly) { 4624 // C++ [dcl.init.ref]p4: 4625 // [...] In all cases where the reference-related or 4626 // reference-compatible relationship of two types is used to 4627 // establish the validity of a reference binding, and T1 is a 4628 // base class of T2, a program that necessitates such a binding 4629 // is ill-formed if T1 is an inaccessible (clause 11) or 4630 // ambiguous (10.2) base class of T2. 4631 // 4632 // Note that we only check this condition when we're allowed to 4633 // complain about errors, because we should not be checking for 4634 // ambiguity (or inaccessibility) unless the reference binding 4635 // actually happens. 4636 if (DerivedToBase) 4637 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4638 Init->getSourceRange(), 4639 IgnoreBaseAccess); 4640 else 4641 return false; 4642 } 4643 4644 // -- Otherwise, the reference shall be to a non-volatile const 4645 // type (i.e., cv1 shall be const), or the reference shall be an 4646 // rvalue reference and the initializer expression shall be an rvalue. 4647 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4648 if (!ICS) 4649 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4650 << T1.isVolatileQualified() 4651 << T1 << int(InitLvalue != Expr::LV_Valid) 4652 << T2 << Init->getSourceRange(); 4653 return true; 4654 } 4655 4656 // -- If the initializer expression is an rvalue, with T2 a 4657 // class type, and "cv1 T1" is reference-compatible with 4658 // "cv2 T2," the reference is bound in one of the 4659 // following ways (the choice is implementation-defined): 4660 // 4661 // -- The reference is bound to the object represented by 4662 // the rvalue (see 3.10) or to a sub-object within that 4663 // object. 4664 // 4665 // -- A temporary of type "cv1 T2" [sic] is created, and 4666 // a constructor is called to copy the entire rvalue 4667 // object into the temporary. The reference is bound to 4668 // the temporary or to a sub-object within the 4669 // temporary. 4670 // 4671 // The constructor that would be used to make the copy 4672 // shall be callable whether or not the copy is actually 4673 // done. 4674 // 4675 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4676 // freedom, so we will always take the first option and never build 4677 // a temporary in this case. FIXME: We will, however, have to check 4678 // for the presence of a copy constructor in C++98/03 mode. 4679 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4680 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4681 if (ICS) { 4682 ICS->setStandard(); 4683 ICS->Standard.First = ICK_Identity; 4684 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4685 ICS->Standard.Third = ICK_Identity; 4686 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4687 ICS->Standard.setToType(0, T2); 4688 ICS->Standard.setToType(1, T1); 4689 ICS->Standard.setToType(2, T1); 4690 ICS->Standard.ReferenceBinding = true; 4691 ICS->Standard.DirectBinding = false; 4692 ICS->Standard.RRefBinding = isRValRef; 4693 ICS->Standard.CopyConstructor = 0; 4694 } else { 4695 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4696 if (DerivedToBase) 4697 CK = CastExpr::CK_DerivedToBase; 4698 else if(CheckExceptionSpecCompatibility(Init, T1)) 4699 return true; 4700 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4701 } 4702 return false; 4703 } 4704 4705 // -- Otherwise, a temporary of type "cv1 T1" is created and 4706 // initialized from the initializer expression using the 4707 // rules for a non-reference copy initialization (8.5). The 4708 // reference is then bound to the temporary. If T1 is 4709 // reference-related to T2, cv1 must be the same 4710 // cv-qualification as, or greater cv-qualification than, 4711 // cv2; otherwise, the program is ill-formed. 4712 if (RefRelationship == Ref_Related) { 4713 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4714 // we would be reference-compatible or reference-compatible with 4715 // added qualification. But that wasn't the case, so the reference 4716 // initialization fails. 4717 if (!ICS) 4718 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4719 << T1 << int(InitLvalue != Expr::LV_Valid) 4720 << T2 << Init->getSourceRange(); 4721 return true; 4722 } 4723 4724 // If at least one of the types is a class type, the types are not 4725 // related, and we aren't allowed any user conversions, the 4726 // reference binding fails. This case is important for breaking 4727 // recursion, since TryImplicitConversion below will attempt to 4728 // create a temporary through the use of a copy constructor. 4729 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4730 (T1->isRecordType() || T2->isRecordType())) { 4731 if (!ICS) 4732 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4733 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4734 return true; 4735 } 4736 4737 // Actually try to convert the initializer to T1. 4738 if (ICS) { 4739 // C++ [over.ics.ref]p2: 4740 // 4741 // When a parameter of reference type is not bound directly to 4742 // an argument expression, the conversion sequence is the one 4743 // required to convert the argument expression to the 4744 // underlying type of the reference according to 4745 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4746 // to copy-initializing a temporary of the underlying type with 4747 // the argument expression. Any difference in top-level 4748 // cv-qualification is subsumed by the initialization itself 4749 // and does not constitute a conversion. 4750 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4751 /*AllowExplicit=*/false, 4752 /*ForceRValue=*/false, 4753 /*InOverloadResolution=*/false); 4754 4755 // Of course, that's still a reference binding. 4756 if (ICS->isStandard()) { 4757 ICS->Standard.ReferenceBinding = true; 4758 ICS->Standard.RRefBinding = isRValRef; 4759 } else if (ICS->isUserDefined()) { 4760 ICS->UserDefined.After.ReferenceBinding = true; 4761 ICS->UserDefined.After.RRefBinding = isRValRef; 4762 } 4763 return ICS->isBad(); 4764 } else { 4765 ImplicitConversionSequence Conversions; 4766 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4767 false, false, 4768 Conversions); 4769 if (badConversion) { 4770 if (Conversions.isAmbiguous()) { 4771 Diag(DeclLoc, 4772 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4773 for (int j = Conversions.Ambiguous.conversions().size()-1; 4774 j >= 0; j--) { 4775 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4776 NoteOverloadCandidate(Func); 4777 } 4778 } 4779 else { 4780 if (isRValRef) 4781 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4782 << Init->getSourceRange(); 4783 else 4784 Diag(DeclLoc, diag::err_invalid_initialization) 4785 << DeclType << Init->getType() << Init->getSourceRange(); 4786 } 4787 } 4788 return badConversion; 4789 } 4790} 4791 4792static inline bool 4793CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4794 const FunctionDecl *FnDecl) { 4795 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4796 if (isa<NamespaceDecl>(DC)) { 4797 return SemaRef.Diag(FnDecl->getLocation(), 4798 diag::err_operator_new_delete_declared_in_namespace) 4799 << FnDecl->getDeclName(); 4800 } 4801 4802 if (isa<TranslationUnitDecl>(DC) && 4803 FnDecl->getStorageClass() == FunctionDecl::Static) { 4804 return SemaRef.Diag(FnDecl->getLocation(), 4805 diag::err_operator_new_delete_declared_static) 4806 << FnDecl->getDeclName(); 4807 } 4808 4809 return false; 4810} 4811 4812static inline bool 4813CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4814 CanQualType ExpectedResultType, 4815 CanQualType ExpectedFirstParamType, 4816 unsigned DependentParamTypeDiag, 4817 unsigned InvalidParamTypeDiag) { 4818 QualType ResultType = 4819 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4820 4821 // Check that the result type is not dependent. 4822 if (ResultType->isDependentType()) 4823 return SemaRef.Diag(FnDecl->getLocation(), 4824 diag::err_operator_new_delete_dependent_result_type) 4825 << FnDecl->getDeclName() << ExpectedResultType; 4826 4827 // Check that the result type is what we expect. 4828 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4829 return SemaRef.Diag(FnDecl->getLocation(), 4830 diag::err_operator_new_delete_invalid_result_type) 4831 << FnDecl->getDeclName() << ExpectedResultType; 4832 4833 // A function template must have at least 2 parameters. 4834 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4835 return SemaRef.Diag(FnDecl->getLocation(), 4836 diag::err_operator_new_delete_template_too_few_parameters) 4837 << FnDecl->getDeclName(); 4838 4839 // The function decl must have at least 1 parameter. 4840 if (FnDecl->getNumParams() == 0) 4841 return SemaRef.Diag(FnDecl->getLocation(), 4842 diag::err_operator_new_delete_too_few_parameters) 4843 << FnDecl->getDeclName(); 4844 4845 // Check the the first parameter type is not dependent. 4846 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4847 if (FirstParamType->isDependentType()) 4848 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4849 << FnDecl->getDeclName() << ExpectedFirstParamType; 4850 4851 // Check that the first parameter type is what we expect. 4852 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4853 ExpectedFirstParamType) 4854 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4855 << FnDecl->getDeclName() << ExpectedFirstParamType; 4856 4857 return false; 4858} 4859 4860static bool 4861CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4862 // C++ [basic.stc.dynamic.allocation]p1: 4863 // A program is ill-formed if an allocation function is declared in a 4864 // namespace scope other than global scope or declared static in global 4865 // scope. 4866 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4867 return true; 4868 4869 CanQualType SizeTy = 4870 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4871 4872 // C++ [basic.stc.dynamic.allocation]p1: 4873 // The return type shall be void*. The first parameter shall have type 4874 // std::size_t. 4875 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4876 SizeTy, 4877 diag::err_operator_new_dependent_param_type, 4878 diag::err_operator_new_param_type)) 4879 return true; 4880 4881 // C++ [basic.stc.dynamic.allocation]p1: 4882 // The first parameter shall not have an associated default argument. 4883 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4884 return SemaRef.Diag(FnDecl->getLocation(), 4885 diag::err_operator_new_default_arg) 4886 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4887 4888 return false; 4889} 4890 4891static bool 4892CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4893 // C++ [basic.stc.dynamic.deallocation]p1: 4894 // A program is ill-formed if deallocation functions are declared in a 4895 // namespace scope other than global scope or declared static in global 4896 // scope. 4897 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4898 return true; 4899 4900 // C++ [basic.stc.dynamic.deallocation]p2: 4901 // Each deallocation function shall return void and its first parameter 4902 // shall be void*. 4903 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4904 SemaRef.Context.VoidPtrTy, 4905 diag::err_operator_delete_dependent_param_type, 4906 diag::err_operator_delete_param_type)) 4907 return true; 4908 4909 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4910 if (FirstParamType->isDependentType()) 4911 return SemaRef.Diag(FnDecl->getLocation(), 4912 diag::err_operator_delete_dependent_param_type) 4913 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4914 4915 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4916 SemaRef.Context.VoidPtrTy) 4917 return SemaRef.Diag(FnDecl->getLocation(), 4918 diag::err_operator_delete_param_type) 4919 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4920 4921 return false; 4922} 4923 4924/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4925/// of this overloaded operator is well-formed. If so, returns false; 4926/// otherwise, emits appropriate diagnostics and returns true. 4927bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4928 assert(FnDecl && FnDecl->isOverloadedOperator() && 4929 "Expected an overloaded operator declaration"); 4930 4931 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4932 4933 // C++ [over.oper]p5: 4934 // The allocation and deallocation functions, operator new, 4935 // operator new[], operator delete and operator delete[], are 4936 // described completely in 3.7.3. The attributes and restrictions 4937 // found in the rest of this subclause do not apply to them unless 4938 // explicitly stated in 3.7.3. 4939 if (Op == OO_Delete || Op == OO_Array_Delete) 4940 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4941 4942 if (Op == OO_New || Op == OO_Array_New) 4943 return CheckOperatorNewDeclaration(*this, FnDecl); 4944 4945 // C++ [over.oper]p6: 4946 // An operator function shall either be a non-static member 4947 // function or be a non-member function and have at least one 4948 // parameter whose type is a class, a reference to a class, an 4949 // enumeration, or a reference to an enumeration. 4950 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4951 if (MethodDecl->isStatic()) 4952 return Diag(FnDecl->getLocation(), 4953 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4954 } else { 4955 bool ClassOrEnumParam = false; 4956 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4957 ParamEnd = FnDecl->param_end(); 4958 Param != ParamEnd; ++Param) { 4959 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4960 if (ParamType->isDependentType() || ParamType->isRecordType() || 4961 ParamType->isEnumeralType()) { 4962 ClassOrEnumParam = true; 4963 break; 4964 } 4965 } 4966 4967 if (!ClassOrEnumParam) 4968 return Diag(FnDecl->getLocation(), 4969 diag::err_operator_overload_needs_class_or_enum) 4970 << FnDecl->getDeclName(); 4971 } 4972 4973 // C++ [over.oper]p8: 4974 // An operator function cannot have default arguments (8.3.6), 4975 // except where explicitly stated below. 4976 // 4977 // Only the function-call operator allows default arguments 4978 // (C++ [over.call]p1). 4979 if (Op != OO_Call) { 4980 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4981 Param != FnDecl->param_end(); ++Param) { 4982 if ((*Param)->hasDefaultArg()) 4983 return Diag((*Param)->getLocation(), 4984 diag::err_operator_overload_default_arg) 4985 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4986 } 4987 } 4988 4989 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4990 { false, false, false } 4991#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4992 , { Unary, Binary, MemberOnly } 4993#include "clang/Basic/OperatorKinds.def" 4994 }; 4995 4996 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4997 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4998 bool MustBeMemberOperator = OperatorUses[Op][2]; 4999 5000 // C++ [over.oper]p8: 5001 // [...] Operator functions cannot have more or fewer parameters 5002 // than the number required for the corresponding operator, as 5003 // described in the rest of this subclause. 5004 unsigned NumParams = FnDecl->getNumParams() 5005 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5006 if (Op != OO_Call && 5007 ((NumParams == 1 && !CanBeUnaryOperator) || 5008 (NumParams == 2 && !CanBeBinaryOperator) || 5009 (NumParams < 1) || (NumParams > 2))) { 5010 // We have the wrong number of parameters. 5011 unsigned ErrorKind; 5012 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5013 ErrorKind = 2; // 2 -> unary or binary. 5014 } else if (CanBeUnaryOperator) { 5015 ErrorKind = 0; // 0 -> unary 5016 } else { 5017 assert(CanBeBinaryOperator && 5018 "All non-call overloaded operators are unary or binary!"); 5019 ErrorKind = 1; // 1 -> binary 5020 } 5021 5022 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5023 << FnDecl->getDeclName() << NumParams << ErrorKind; 5024 } 5025 5026 // Overloaded operators other than operator() cannot be variadic. 5027 if (Op != OO_Call && 5028 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5029 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5030 << FnDecl->getDeclName(); 5031 } 5032 5033 // Some operators must be non-static member functions. 5034 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5035 return Diag(FnDecl->getLocation(), 5036 diag::err_operator_overload_must_be_member) 5037 << FnDecl->getDeclName(); 5038 } 5039 5040 // C++ [over.inc]p1: 5041 // The user-defined function called operator++ implements the 5042 // prefix and postfix ++ operator. If this function is a member 5043 // function with no parameters, or a non-member function with one 5044 // parameter of class or enumeration type, it defines the prefix 5045 // increment operator ++ for objects of that type. If the function 5046 // is a member function with one parameter (which shall be of type 5047 // int) or a non-member function with two parameters (the second 5048 // of which shall be of type int), it defines the postfix 5049 // increment operator ++ for objects of that type. 5050 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5051 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5052 bool ParamIsInt = false; 5053 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5054 ParamIsInt = BT->getKind() == BuiltinType::Int; 5055 5056 if (!ParamIsInt) 5057 return Diag(LastParam->getLocation(), 5058 diag::err_operator_overload_post_incdec_must_be_int) 5059 << LastParam->getType() << (Op == OO_MinusMinus); 5060 } 5061 5062 // Notify the class if it got an assignment operator. 5063 if (Op == OO_Equal) { 5064 // Would have returned earlier otherwise. 5065 assert(isa<CXXMethodDecl>(FnDecl) && 5066 "Overloaded = not member, but not filtered."); 5067 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5068 Method->getParent()->addedAssignmentOperator(Context, Method); 5069 } 5070 5071 return false; 5072} 5073 5074/// CheckLiteralOperatorDeclaration - Check whether the declaration 5075/// of this literal operator function is well-formed. If so, returns 5076/// false; otherwise, emits appropriate diagnostics and returns true. 5077bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5078 DeclContext *DC = FnDecl->getDeclContext(); 5079 Decl::Kind Kind = DC->getDeclKind(); 5080 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5081 Kind != Decl::LinkageSpec) { 5082 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5083 << FnDecl->getDeclName(); 5084 return true; 5085 } 5086 5087 bool Valid = false; 5088 5089 // FIXME: Check for the one valid template signature 5090 // template <char...> type operator "" name(); 5091 5092 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5093 // Check the first parameter 5094 QualType T = (*Param)->getType(); 5095 5096 // unsigned long long int and long double are allowed, but only 5097 // alone. 5098 // We also allow any character type; their omission seems to be a bug 5099 // in n3000 5100 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5101 Context.hasSameType(T, Context.LongDoubleTy) || 5102 Context.hasSameType(T, Context.CharTy) || 5103 Context.hasSameType(T, Context.WCharTy) || 5104 Context.hasSameType(T, Context.Char16Ty) || 5105 Context.hasSameType(T, Context.Char32Ty)) { 5106 if (++Param == FnDecl->param_end()) 5107 Valid = true; 5108 goto FinishedParams; 5109 } 5110 5111 // Otherwise it must be a pointer to const; let's strip those. 5112 const PointerType *PT = T->getAs<PointerType>(); 5113 if (!PT) 5114 goto FinishedParams; 5115 T = PT->getPointeeType(); 5116 if (!T.isConstQualified()) 5117 goto FinishedParams; 5118 T = T.getUnqualifiedType(); 5119 5120 // Move on to the second parameter; 5121 ++Param; 5122 5123 // If there is no second parameter, the first must be a const char * 5124 if (Param == FnDecl->param_end()) { 5125 if (Context.hasSameType(T, Context.CharTy)) 5126 Valid = true; 5127 goto FinishedParams; 5128 } 5129 5130 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5131 // are allowed as the first parameter to a two-parameter function 5132 if (!(Context.hasSameType(T, Context.CharTy) || 5133 Context.hasSameType(T, Context.WCharTy) || 5134 Context.hasSameType(T, Context.Char16Ty) || 5135 Context.hasSameType(T, Context.Char32Ty))) 5136 goto FinishedParams; 5137 5138 // The second and final parameter must be an std::size_t 5139 T = (*Param)->getType().getUnqualifiedType(); 5140 if (Context.hasSameType(T, Context.getSizeType()) && 5141 ++Param == FnDecl->param_end()) 5142 Valid = true; 5143 } 5144 5145 // FIXME: This diagnostic is absolutely terrible. 5146FinishedParams: 5147 if (!Valid) { 5148 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5149 << FnDecl->getDeclName(); 5150 return true; 5151 } 5152 5153 return false; 5154} 5155 5156/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5157/// linkage specification, including the language and (if present) 5158/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5159/// the location of the language string literal, which is provided 5160/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5161/// the '{' brace. Otherwise, this linkage specification does not 5162/// have any braces. 5163Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5164 SourceLocation ExternLoc, 5165 SourceLocation LangLoc, 5166 const char *Lang, 5167 unsigned StrSize, 5168 SourceLocation LBraceLoc) { 5169 LinkageSpecDecl::LanguageIDs Language; 5170 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5171 Language = LinkageSpecDecl::lang_c; 5172 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5173 Language = LinkageSpecDecl::lang_cxx; 5174 else { 5175 Diag(LangLoc, diag::err_bad_language); 5176 return DeclPtrTy(); 5177 } 5178 5179 // FIXME: Add all the various semantics of linkage specifications 5180 5181 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5182 LangLoc, Language, 5183 LBraceLoc.isValid()); 5184 CurContext->addDecl(D); 5185 PushDeclContext(S, D); 5186 return DeclPtrTy::make(D); 5187} 5188 5189/// ActOnFinishLinkageSpecification - Completely the definition of 5190/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5191/// valid, it's the position of the closing '}' brace in a linkage 5192/// specification that uses braces. 5193Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5194 DeclPtrTy LinkageSpec, 5195 SourceLocation RBraceLoc) { 5196 if (LinkageSpec) 5197 PopDeclContext(); 5198 return LinkageSpec; 5199} 5200 5201/// \brief Perform semantic analysis for the variable declaration that 5202/// occurs within a C++ catch clause, returning the newly-created 5203/// variable. 5204VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5205 TypeSourceInfo *TInfo, 5206 IdentifierInfo *Name, 5207 SourceLocation Loc, 5208 SourceRange Range) { 5209 bool Invalid = false; 5210 5211 // Arrays and functions decay. 5212 if (ExDeclType->isArrayType()) 5213 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5214 else if (ExDeclType->isFunctionType()) 5215 ExDeclType = Context.getPointerType(ExDeclType); 5216 5217 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5218 // The exception-declaration shall not denote a pointer or reference to an 5219 // incomplete type, other than [cv] void*. 5220 // N2844 forbids rvalue references. 5221 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5222 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5223 Invalid = true; 5224 } 5225 5226 // GCC allows catching pointers and references to incomplete types 5227 // as an extension; so do we, but we warn by default. 5228 5229 QualType BaseType = ExDeclType; 5230 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5231 unsigned DK = diag::err_catch_incomplete; 5232 bool IncompleteCatchIsInvalid = true; 5233 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5234 BaseType = Ptr->getPointeeType(); 5235 Mode = 1; 5236 DK = diag::ext_catch_incomplete_ptr; 5237 IncompleteCatchIsInvalid = false; 5238 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5239 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5240 BaseType = Ref->getPointeeType(); 5241 Mode = 2; 5242 DK = diag::ext_catch_incomplete_ref; 5243 IncompleteCatchIsInvalid = false; 5244 } 5245 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5246 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5247 IncompleteCatchIsInvalid) 5248 Invalid = true; 5249 5250 if (!Invalid && !ExDeclType->isDependentType() && 5251 RequireNonAbstractType(Loc, ExDeclType, 5252 diag::err_abstract_type_in_decl, 5253 AbstractVariableType)) 5254 Invalid = true; 5255 5256 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5257 Name, ExDeclType, TInfo, VarDecl::None); 5258 5259 if (!Invalid) { 5260 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5261 // C++ [except.handle]p16: 5262 // The object declared in an exception-declaration or, if the 5263 // exception-declaration does not specify a name, a temporary (12.2) is 5264 // copy-initialized (8.5) from the exception object. [...] 5265 // The object is destroyed when the handler exits, after the destruction 5266 // of any automatic objects initialized within the handler. 5267 // 5268 // We just pretend to initialize the object with itself, then make sure 5269 // it can be destroyed later. 5270 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5271 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5272 Loc, ExDeclType, 0); 5273 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5274 SourceLocation()); 5275 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5276 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5277 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5278 if (Result.isInvalid()) 5279 Invalid = true; 5280 else 5281 FinalizeVarWithDestructor(ExDecl, RecordTy); 5282 } 5283 } 5284 5285 if (Invalid) 5286 ExDecl->setInvalidDecl(); 5287 5288 return ExDecl; 5289} 5290 5291/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5292/// handler. 5293Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5294 TypeSourceInfo *TInfo = 0; 5295 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5296 5297 bool Invalid = D.isInvalidType(); 5298 IdentifierInfo *II = D.getIdentifier(); 5299 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5300 // The scope should be freshly made just for us. There is just no way 5301 // it contains any previous declaration. 5302 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5303 if (PrevDecl->isTemplateParameter()) { 5304 // Maybe we will complain about the shadowed template parameter. 5305 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5306 } 5307 } 5308 5309 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5310 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5311 << D.getCXXScopeSpec().getRange(); 5312 Invalid = true; 5313 } 5314 5315 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5316 D.getIdentifier(), 5317 D.getIdentifierLoc(), 5318 D.getDeclSpec().getSourceRange()); 5319 5320 if (Invalid) 5321 ExDecl->setInvalidDecl(); 5322 5323 // Add the exception declaration into this scope. 5324 if (II) 5325 PushOnScopeChains(ExDecl, S); 5326 else 5327 CurContext->addDecl(ExDecl); 5328 5329 ProcessDeclAttributes(S, ExDecl, D); 5330 return DeclPtrTy::make(ExDecl); 5331} 5332 5333Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5334 ExprArg assertexpr, 5335 ExprArg assertmessageexpr) { 5336 Expr *AssertExpr = (Expr *)assertexpr.get(); 5337 StringLiteral *AssertMessage = 5338 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5339 5340 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5341 llvm::APSInt Value(32); 5342 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5343 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5344 AssertExpr->getSourceRange(); 5345 return DeclPtrTy(); 5346 } 5347 5348 if (Value == 0) { 5349 Diag(AssertLoc, diag::err_static_assert_failed) 5350 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5351 } 5352 } 5353 5354 assertexpr.release(); 5355 assertmessageexpr.release(); 5356 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5357 AssertExpr, AssertMessage); 5358 5359 CurContext->addDecl(Decl); 5360 return DeclPtrTy::make(Decl); 5361} 5362 5363/// Handle a friend type declaration. This works in tandem with 5364/// ActOnTag. 5365/// 5366/// Notes on friend class templates: 5367/// 5368/// We generally treat friend class declarations as if they were 5369/// declaring a class. So, for example, the elaborated type specifier 5370/// in a friend declaration is required to obey the restrictions of a 5371/// class-head (i.e. no typedefs in the scope chain), template 5372/// parameters are required to match up with simple template-ids, &c. 5373/// However, unlike when declaring a template specialization, it's 5374/// okay to refer to a template specialization without an empty 5375/// template parameter declaration, e.g. 5376/// friend class A<T>::B<unsigned>; 5377/// We permit this as a special case; if there are any template 5378/// parameters present at all, require proper matching, i.e. 5379/// template <> template <class T> friend class A<int>::B; 5380Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5381 MultiTemplateParamsArg TempParams) { 5382 SourceLocation Loc = DS.getSourceRange().getBegin(); 5383 5384 assert(DS.isFriendSpecified()); 5385 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5386 5387 // Try to convert the decl specifier to a type. This works for 5388 // friend templates because ActOnTag never produces a ClassTemplateDecl 5389 // for a TUK_Friend. 5390 Declarator TheDeclarator(DS, Declarator::MemberContext); 5391 TypeSourceInfo *TSI; 5392 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5393 if (TheDeclarator.isInvalidType()) 5394 return DeclPtrTy(); 5395 5396 // This is definitely an error in C++98. It's probably meant to 5397 // be forbidden in C++0x, too, but the specification is just 5398 // poorly written. 5399 // 5400 // The problem is with declarations like the following: 5401 // template <T> friend A<T>::foo; 5402 // where deciding whether a class C is a friend or not now hinges 5403 // on whether there exists an instantiation of A that causes 5404 // 'foo' to equal C. There are restrictions on class-heads 5405 // (which we declare (by fiat) elaborated friend declarations to 5406 // be) that makes this tractable. 5407 // 5408 // FIXME: handle "template <> friend class A<T>;", which 5409 // is possibly well-formed? Who even knows? 5410 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5411 Diag(Loc, diag::err_tagless_friend_type_template) 5412 << DS.getSourceRange(); 5413 return DeclPtrTy(); 5414 } 5415 5416 // C++ [class.friend]p2: 5417 // An elaborated-type-specifier shall be used in a friend declaration 5418 // for a class.* 5419 // * The class-key of the elaborated-type-specifier is required. 5420 // This is one of the rare places in Clang where it's legitimate to 5421 // ask about the "spelling" of the type. 5422 if (!getLangOptions().CPlusPlus0x && !T->isElaboratedTypeSpecifier()) { 5423 // If we evaluated the type to a record type, suggest putting 5424 // a tag in front. 5425 if (const RecordType *RT = T->getAs<RecordType>()) { 5426 RecordDecl *RD = RT->getDecl(); 5427 5428 std::string InsertionText = std::string(" ") + RD->getKindName(); 5429 5430 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5431 << (unsigned) RD->getTagKind() 5432 << T 5433 << SourceRange(DS.getFriendSpecLoc()) 5434 << FixItHint::CreateInsertion(DS.getTypeSpecTypeLoc(), InsertionText); 5435 return DeclPtrTy(); 5436 }else { 5437 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5438 << DS.getSourceRange(); 5439 return DeclPtrTy(); 5440 } 5441 } 5442 5443 // Enum types cannot be friends. 5444 if (T->getAs<EnumType>()) { 5445 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5446 << SourceRange(DS.getFriendSpecLoc()); 5447 return DeclPtrTy(); 5448 } 5449 5450 // C++98 [class.friend]p1: A friend of a class is a function 5451 // or class that is not a member of the class . . . 5452 // This is fixed in DR77, which just barely didn't make the C++03 5453 // deadline. It's also a very silly restriction that seriously 5454 // affects inner classes and which nobody else seems to implement; 5455 // thus we never diagnose it, not even in -pedantic. 5456 // 5457 // But note that we could warn about it: it's always useless to 5458 // friend one of your own members (it's not, however, worthless to 5459 // friend a member of an arbitrary specialization of your template). 5460 5461 Decl *D; 5462 if (TempParams.size()) 5463 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5464 TempParams.size(), 5465 (TemplateParameterList**) TempParams.release(), 5466 TSI, 5467 DS.getFriendSpecLoc()); 5468 else 5469 D = FriendDecl::Create(Context, CurContext, Loc, TSI, 5470 DS.getFriendSpecLoc()); 5471 D->setAccess(AS_public); 5472 CurContext->addDecl(D); 5473 5474 return DeclPtrTy::make(D); 5475} 5476 5477Sema::DeclPtrTy 5478Sema::ActOnFriendFunctionDecl(Scope *S, 5479 Declarator &D, 5480 bool IsDefinition, 5481 MultiTemplateParamsArg TemplateParams) { 5482 const DeclSpec &DS = D.getDeclSpec(); 5483 5484 assert(DS.isFriendSpecified()); 5485 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5486 5487 SourceLocation Loc = D.getIdentifierLoc(); 5488 TypeSourceInfo *TInfo = 0; 5489 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5490 5491 // C++ [class.friend]p1 5492 // A friend of a class is a function or class.... 5493 // Note that this sees through typedefs, which is intended. 5494 // It *doesn't* see through dependent types, which is correct 5495 // according to [temp.arg.type]p3: 5496 // If a declaration acquires a function type through a 5497 // type dependent on a template-parameter and this causes 5498 // a declaration that does not use the syntactic form of a 5499 // function declarator to have a function type, the program 5500 // is ill-formed. 5501 if (!T->isFunctionType()) { 5502 Diag(Loc, diag::err_unexpected_friend); 5503 5504 // It might be worthwhile to try to recover by creating an 5505 // appropriate declaration. 5506 return DeclPtrTy(); 5507 } 5508 5509 // C++ [namespace.memdef]p3 5510 // - If a friend declaration in a non-local class first declares a 5511 // class or function, the friend class or function is a member 5512 // of the innermost enclosing namespace. 5513 // - The name of the friend is not found by simple name lookup 5514 // until a matching declaration is provided in that namespace 5515 // scope (either before or after the class declaration granting 5516 // friendship). 5517 // - If a friend function is called, its name may be found by the 5518 // name lookup that considers functions from namespaces and 5519 // classes associated with the types of the function arguments. 5520 // - When looking for a prior declaration of a class or a function 5521 // declared as a friend, scopes outside the innermost enclosing 5522 // namespace scope are not considered. 5523 5524 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5525 DeclarationName Name = GetNameForDeclarator(D); 5526 assert(Name); 5527 5528 // The context we found the declaration in, or in which we should 5529 // create the declaration. 5530 DeclContext *DC; 5531 5532 // FIXME: handle local classes 5533 5534 // Recover from invalid scope qualifiers as if they just weren't there. 5535 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5536 ForRedeclaration); 5537 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5538 // FIXME: RequireCompleteDeclContext 5539 DC = computeDeclContext(ScopeQual); 5540 5541 // FIXME: handle dependent contexts 5542 if (!DC) return DeclPtrTy(); 5543 5544 LookupQualifiedName(Previous, DC); 5545 5546 // If searching in that context implicitly found a declaration in 5547 // a different context, treat it like it wasn't found at all. 5548 // TODO: better diagnostics for this case. Suggesting the right 5549 // qualified scope would be nice... 5550 // FIXME: getRepresentativeDecl() is not right here at all 5551 if (Previous.empty() || 5552 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5553 D.setInvalidType(); 5554 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5555 return DeclPtrTy(); 5556 } 5557 5558 // C++ [class.friend]p1: A friend of a class is a function or 5559 // class that is not a member of the class . . . 5560 if (DC->Equals(CurContext)) 5561 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5562 5563 // Otherwise walk out to the nearest namespace scope looking for matches. 5564 } else { 5565 // TODO: handle local class contexts. 5566 5567 DC = CurContext; 5568 while (true) { 5569 // Skip class contexts. If someone can cite chapter and verse 5570 // for this behavior, that would be nice --- it's what GCC and 5571 // EDG do, and it seems like a reasonable intent, but the spec 5572 // really only says that checks for unqualified existing 5573 // declarations should stop at the nearest enclosing namespace, 5574 // not that they should only consider the nearest enclosing 5575 // namespace. 5576 while (DC->isRecord()) 5577 DC = DC->getParent(); 5578 5579 LookupQualifiedName(Previous, DC); 5580 5581 // TODO: decide what we think about using declarations. 5582 if (!Previous.empty()) 5583 break; 5584 5585 if (DC->isFileContext()) break; 5586 DC = DC->getParent(); 5587 } 5588 5589 // C++ [class.friend]p1: A friend of a class is a function or 5590 // class that is not a member of the class . . . 5591 // C++0x changes this for both friend types and functions. 5592 // Most C++ 98 compilers do seem to give an error here, so 5593 // we do, too. 5594 if (!Previous.empty() && DC->Equals(CurContext) 5595 && !getLangOptions().CPlusPlus0x) 5596 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5597 } 5598 5599 if (DC->isFileContext()) { 5600 // This implies that it has to be an operator or function. 5601 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5602 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5603 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5604 Diag(Loc, diag::err_introducing_special_friend) << 5605 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5606 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5607 return DeclPtrTy(); 5608 } 5609 } 5610 5611 bool Redeclaration = false; 5612 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5613 move(TemplateParams), 5614 IsDefinition, 5615 Redeclaration); 5616 if (!ND) return DeclPtrTy(); 5617 5618 assert(ND->getDeclContext() == DC); 5619 assert(ND->getLexicalDeclContext() == CurContext); 5620 5621 // Add the function declaration to the appropriate lookup tables, 5622 // adjusting the redeclarations list as necessary. We don't 5623 // want to do this yet if the friending class is dependent. 5624 // 5625 // Also update the scope-based lookup if the target context's 5626 // lookup context is in lexical scope. 5627 if (!CurContext->isDependentContext()) { 5628 DC = DC->getLookupContext(); 5629 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5630 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5631 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5632 } 5633 5634 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5635 D.getIdentifierLoc(), ND, 5636 DS.getFriendSpecLoc()); 5637 FrD->setAccess(AS_public); 5638 CurContext->addDecl(FrD); 5639 5640 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5641 FrD->setSpecialization(true); 5642 5643 return DeclPtrTy::make(ND); 5644} 5645 5646void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5647 AdjustDeclIfTemplate(dcl); 5648 5649 Decl *Dcl = dcl.getAs<Decl>(); 5650 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5651 if (!Fn) { 5652 Diag(DelLoc, diag::err_deleted_non_function); 5653 return; 5654 } 5655 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5656 Diag(DelLoc, diag::err_deleted_decl_not_first); 5657 Diag(Prev->getLocation(), diag::note_previous_declaration); 5658 // If the declaration wasn't the first, we delete the function anyway for 5659 // recovery. 5660 } 5661 Fn->setDeleted(); 5662} 5663 5664static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5665 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5666 ++CI) { 5667 Stmt *SubStmt = *CI; 5668 if (!SubStmt) 5669 continue; 5670 if (isa<ReturnStmt>(SubStmt)) 5671 Self.Diag(SubStmt->getSourceRange().getBegin(), 5672 diag::err_return_in_constructor_handler); 5673 if (!isa<Expr>(SubStmt)) 5674 SearchForReturnInStmt(Self, SubStmt); 5675 } 5676} 5677 5678void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5679 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5680 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5681 SearchForReturnInStmt(*this, Handler); 5682 } 5683} 5684 5685bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5686 const CXXMethodDecl *Old) { 5687 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5688 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5689 5690 if (Context.hasSameType(NewTy, OldTy) || 5691 NewTy->isDependentType() || OldTy->isDependentType()) 5692 return false; 5693 5694 // Check if the return types are covariant 5695 QualType NewClassTy, OldClassTy; 5696 5697 /// Both types must be pointers or references to classes. 5698 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5699 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5700 NewClassTy = NewPT->getPointeeType(); 5701 OldClassTy = OldPT->getPointeeType(); 5702 } 5703 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5704 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5705 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5706 NewClassTy = NewRT->getPointeeType(); 5707 OldClassTy = OldRT->getPointeeType(); 5708 } 5709 } 5710 } 5711 5712 // The return types aren't either both pointers or references to a class type. 5713 if (NewClassTy.isNull()) { 5714 Diag(New->getLocation(), 5715 diag::err_different_return_type_for_overriding_virtual_function) 5716 << New->getDeclName() << NewTy << OldTy; 5717 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5718 5719 return true; 5720 } 5721 5722 // C++ [class.virtual]p6: 5723 // If the return type of D::f differs from the return type of B::f, the 5724 // class type in the return type of D::f shall be complete at the point of 5725 // declaration of D::f or shall be the class type D. 5726 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5727 if (!RT->isBeingDefined() && 5728 RequireCompleteType(New->getLocation(), NewClassTy, 5729 PDiag(diag::err_covariant_return_incomplete) 5730 << New->getDeclName())) 5731 return true; 5732 } 5733 5734 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5735 // Check if the new class derives from the old class. 5736 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5737 Diag(New->getLocation(), 5738 diag::err_covariant_return_not_derived) 5739 << New->getDeclName() << NewTy << OldTy; 5740 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5741 return true; 5742 } 5743 5744 // Check if we the conversion from derived to base is valid. 5745 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5746 diag::err_covariant_return_inaccessible_base, 5747 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5748 // FIXME: Should this point to the return type? 5749 New->getLocation(), SourceRange(), New->getDeclName())) { 5750 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5751 return true; 5752 } 5753 } 5754 5755 // The qualifiers of the return types must be the same. 5756 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5757 Diag(New->getLocation(), 5758 diag::err_covariant_return_type_different_qualifications) 5759 << New->getDeclName() << NewTy << OldTy; 5760 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5761 return true; 5762 }; 5763 5764 5765 // The new class type must have the same or less qualifiers as the old type. 5766 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5767 Diag(New->getLocation(), 5768 diag::err_covariant_return_type_class_type_more_qualified) 5769 << New->getDeclName() << NewTy << OldTy; 5770 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5771 return true; 5772 }; 5773 5774 return false; 5775} 5776 5777bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5778 const CXXMethodDecl *Old) 5779{ 5780 if (Old->hasAttr<FinalAttr>()) { 5781 Diag(New->getLocation(), diag::err_final_function_overridden) 5782 << New->getDeclName(); 5783 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5784 return true; 5785 } 5786 5787 return false; 5788} 5789 5790/// \brief Mark the given method pure. 5791/// 5792/// \param Method the method to be marked pure. 5793/// 5794/// \param InitRange the source range that covers the "0" initializer. 5795bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5796 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5797 Method->setPure(); 5798 5799 // A class is abstract if at least one function is pure virtual. 5800 Method->getParent()->setAbstract(true); 5801 return false; 5802 } 5803 5804 if (!Method->isInvalidDecl()) 5805 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5806 << Method->getDeclName() << InitRange; 5807 return true; 5808} 5809 5810/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5811/// an initializer for the out-of-line declaration 'Dcl'. The scope 5812/// is a fresh scope pushed for just this purpose. 5813/// 5814/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5815/// static data member of class X, names should be looked up in the scope of 5816/// class X. 5817void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5818 // If there is no declaration, there was an error parsing it. 5819 Decl *D = Dcl.getAs<Decl>(); 5820 if (D == 0) return; 5821 5822 // We should only get called for declarations with scope specifiers, like: 5823 // int foo::bar; 5824 assert(D->isOutOfLine()); 5825 EnterDeclaratorContext(S, D->getDeclContext()); 5826} 5827 5828/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5829/// initializer for the out-of-line declaration 'Dcl'. 5830void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5831 // If there is no declaration, there was an error parsing it. 5832 Decl *D = Dcl.getAs<Decl>(); 5833 if (D == 0) return; 5834 5835 assert(D->isOutOfLine()); 5836 ExitDeclaratorContext(S); 5837} 5838 5839/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5840/// C++ if/switch/while/for statement. 5841/// e.g: "if (int x = f()) {...}" 5842Action::DeclResult 5843Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5844 // C++ 6.4p2: 5845 // The declarator shall not specify a function or an array. 5846 // The type-specifier-seq shall not contain typedef and shall not declare a 5847 // new class or enumeration. 5848 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5849 "Parser allowed 'typedef' as storage class of condition decl."); 5850 5851 TypeSourceInfo *TInfo = 0; 5852 TagDecl *OwnedTag = 0; 5853 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5854 5855 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5856 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5857 // would be created and CXXConditionDeclExpr wants a VarDecl. 5858 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5859 << D.getSourceRange(); 5860 return DeclResult(); 5861 } else if (OwnedTag && OwnedTag->isDefinition()) { 5862 // The type-specifier-seq shall not declare a new class or enumeration. 5863 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5864 } 5865 5866 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5867 if (!Dcl) 5868 return DeclResult(); 5869 5870 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5871 VD->setDeclaredInCondition(true); 5872 return Dcl; 5873} 5874 5875static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5876 // Ignore dependent types. 5877 if (MD->isDependentContext()) 5878 return false; 5879 5880 // Ignore declarations that are not definitions. 5881 if (!MD->isThisDeclarationADefinition()) 5882 return false; 5883 5884 CXXRecordDecl *RD = MD->getParent(); 5885 5886 // Ignore classes without a vtable. 5887 if (!RD->isDynamicClass()) 5888 return false; 5889 5890 switch (MD->getParent()->getTemplateSpecializationKind()) { 5891 case TSK_Undeclared: 5892 case TSK_ExplicitSpecialization: 5893 // Classes that aren't instantiations of templates don't need their 5894 // virtual methods marked until we see the definition of the key 5895 // function. 5896 break; 5897 5898 case TSK_ImplicitInstantiation: 5899 // This is a constructor of a class template; mark all of the virtual 5900 // members as referenced to ensure that they get instantiatied. 5901 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5902 return true; 5903 break; 5904 5905 case TSK_ExplicitInstantiationDeclaration: 5906 return false; 5907 5908 case TSK_ExplicitInstantiationDefinition: 5909 // This is method of a explicit instantiation; mark all of the virtual 5910 // members as referenced to ensure that they get instantiatied. 5911 return true; 5912 } 5913 5914 // Consider only out-of-line definitions of member functions. When we see 5915 // an inline definition, it's too early to compute the key function. 5916 if (!MD->isOutOfLine()) 5917 return false; 5918 5919 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5920 5921 // If there is no key function, we will need a copy of the vtable. 5922 if (!KeyFunction) 5923 return true; 5924 5925 // If this is the key function, we need to mark virtual members. 5926 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5927 return true; 5928 5929 return false; 5930} 5931 5932void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5933 CXXMethodDecl *MD) { 5934 CXXRecordDecl *RD = MD->getParent(); 5935 5936 // We will need to mark all of the virtual members as referenced to build the 5937 // vtable. 5938 if (!needsVtable(MD, Context)) 5939 return; 5940 5941 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5942 if (kind == TSK_ImplicitInstantiation) 5943 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5944 else 5945 MarkVirtualMembersReferenced(Loc, RD); 5946} 5947 5948bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5949 if (ClassesWithUnmarkedVirtualMembers.empty()) 5950 return false; 5951 5952 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5953 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5954 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5955 ClassesWithUnmarkedVirtualMembers.pop_back(); 5956 MarkVirtualMembersReferenced(Loc, RD); 5957 } 5958 5959 return true; 5960} 5961 5962void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5963 const CXXRecordDecl *RD) { 5964 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5965 e = RD->method_end(); i != e; ++i) { 5966 CXXMethodDecl *MD = *i; 5967 5968 // C++ [basic.def.odr]p2: 5969 // [...] A virtual member function is used if it is not pure. [...] 5970 if (MD->isVirtual() && !MD->isPure()) 5971 MarkDeclarationReferenced(Loc, MD); 5972 } 5973 5974 // Only classes that have virtual bases need a VTT. 5975 if (RD->getNumVBases() == 0) 5976 return; 5977 5978 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5979 e = RD->bases_end(); i != e; ++i) { 5980 const CXXRecordDecl *Base = 5981 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5982 if (i->isVirtual()) 5983 continue; 5984 if (Base->getNumVBases() == 0) 5985 continue; 5986 MarkVirtualMembersReferenced(Loc, Base); 5987 } 5988} 5989