SemaDeclCXX.cpp revision 046c294a43024874ff35656c6e785b64e72f1f36
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 // We don't want access-control diagnostics here. 1080 R.suppressDiagnostics(); 1081 1082 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1083 bool NotUnknownSpecialization = false; 1084 DeclContext *DC = computeDeclContext(SS, false); 1085 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1086 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1087 1088 if (!NotUnknownSpecialization) { 1089 // When the scope specifier can refer to a member of an unknown 1090 // specialization, we take it as a type name. 1091 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1092 *MemberOrBase, SS.getRange()); 1093 if (BaseType.isNull()) 1094 return true; 1095 1096 R.clear(); 1097 } 1098 } 1099 1100 // If no results were found, try to correct typos. 1101 if (R.empty() && BaseType.isNull() && 1102 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1103 R.isSingleResult()) { 1104 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1105 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1106 // We have found a non-static data member with a similar 1107 // name to what was typed; complain and initialize that 1108 // member. 1109 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1110 << MemberOrBase << true << R.getLookupName() 1111 << FixItHint::CreateReplacement(R.getNameLoc(), 1112 R.getLookupName().getAsString()); 1113 Diag(Member->getLocation(), diag::note_previous_decl) 1114 << Member->getDeclName(); 1115 1116 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1117 LParenLoc, RParenLoc); 1118 } 1119 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1120 const CXXBaseSpecifier *DirectBaseSpec; 1121 const CXXBaseSpecifier *VirtualBaseSpec; 1122 if (FindBaseInitializer(*this, ClassDecl, 1123 Context.getTypeDeclType(Type), 1124 DirectBaseSpec, VirtualBaseSpec)) { 1125 // We have found a direct or virtual base class with a 1126 // similar name to what was typed; complain and initialize 1127 // that base class. 1128 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1129 << MemberOrBase << false << R.getLookupName() 1130 << FixItHint::CreateReplacement(R.getNameLoc(), 1131 R.getLookupName().getAsString()); 1132 1133 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1134 : VirtualBaseSpec; 1135 Diag(BaseSpec->getSourceRange().getBegin(), 1136 diag::note_base_class_specified_here) 1137 << BaseSpec->getType() 1138 << BaseSpec->getSourceRange(); 1139 1140 TyD = Type; 1141 } 1142 } 1143 } 1144 1145 if (!TyD && BaseType.isNull()) { 1146 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1147 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1148 return true; 1149 } 1150 } 1151 1152 if (BaseType.isNull()) { 1153 BaseType = Context.getTypeDeclType(TyD); 1154 if (SS.isSet()) { 1155 NestedNameSpecifier *Qualifier = 1156 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1157 1158 // FIXME: preserve source range information 1159 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1160 } 1161 } 1162 } 1163 1164 if (!TInfo) 1165 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1166 1167 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1168 LParenLoc, RParenLoc, ClassDecl); 1169} 1170 1171/// Checks an initializer expression for use of uninitialized fields, such as 1172/// containing the field that is being initialized. Returns true if there is an 1173/// uninitialized field was used an updates the SourceLocation parameter; false 1174/// otherwise. 1175static bool InitExprContainsUninitializedFields(const Stmt* S, 1176 const FieldDecl* LhsField, 1177 SourceLocation* L) { 1178 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1179 if (ME) { 1180 const NamedDecl* RhsField = ME->getMemberDecl(); 1181 if (RhsField == LhsField) { 1182 // Initializing a field with itself. Throw a warning. 1183 // But wait; there are exceptions! 1184 // Exception #1: The field may not belong to this record. 1185 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1186 const Expr* base = ME->getBase(); 1187 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1188 // Even though the field matches, it does not belong to this record. 1189 return false; 1190 } 1191 // None of the exceptions triggered; return true to indicate an 1192 // uninitialized field was used. 1193 *L = ME->getMemberLoc(); 1194 return true; 1195 } 1196 } 1197 bool found = false; 1198 for (Stmt::const_child_iterator it = S->child_begin(); 1199 it != S->child_end() && found == false; 1200 ++it) { 1201 if (isa<CallExpr>(S)) { 1202 // Do not descend into function calls or constructors, as the use 1203 // of an uninitialized field may be valid. One would have to inspect 1204 // the contents of the function/ctor to determine if it is safe or not. 1205 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1206 // may be safe, depending on what the function/ctor does. 1207 continue; 1208 } 1209 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1210 } 1211 return found; 1212} 1213 1214Sema::MemInitResult 1215Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1216 unsigned NumArgs, SourceLocation IdLoc, 1217 SourceLocation LParenLoc, 1218 SourceLocation RParenLoc) { 1219 // Diagnose value-uses of fields to initialize themselves, e.g. 1220 // foo(foo) 1221 // where foo is not also a parameter to the constructor. 1222 // TODO: implement -Wuninitialized and fold this into that framework. 1223 for (unsigned i = 0; i < NumArgs; ++i) { 1224 SourceLocation L; 1225 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1226 // FIXME: Return true in the case when other fields are used before being 1227 // uninitialized. For example, let this field be the i'th field. When 1228 // initializing the i'th field, throw a warning if any of the >= i'th 1229 // fields are used, as they are not yet initialized. 1230 // Right now we are only handling the case where the i'th field uses 1231 // itself in its initializer. 1232 Diag(L, diag::warn_field_is_uninit); 1233 } 1234 } 1235 1236 bool HasDependentArg = false; 1237 for (unsigned i = 0; i < NumArgs; i++) 1238 HasDependentArg |= Args[i]->isTypeDependent(); 1239 1240 QualType FieldType = Member->getType(); 1241 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1242 FieldType = Array->getElementType(); 1243 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1244 if (FieldType->isDependentType() || HasDependentArg) { 1245 // Can't check initialization for a member of dependent type or when 1246 // any of the arguments are type-dependent expressions. 1247 OwningExprResult Init 1248 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1249 RParenLoc)); 1250 1251 // Erase any temporaries within this evaluation context; we're not 1252 // going to track them in the AST, since we'll be rebuilding the 1253 // ASTs during template instantiation. 1254 ExprTemporaries.erase( 1255 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1256 ExprTemporaries.end()); 1257 1258 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1259 LParenLoc, 1260 Init.takeAs<Expr>(), 1261 RParenLoc); 1262 1263 } 1264 1265 if (Member->isInvalidDecl()) 1266 return true; 1267 1268 // Initialize the member. 1269 InitializedEntity MemberEntity = 1270 InitializedEntity::InitializeMember(Member, 0); 1271 InitializationKind Kind = 1272 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1273 1274 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1275 1276 OwningExprResult MemberInit = 1277 InitSeq.Perform(*this, MemberEntity, Kind, 1278 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1279 if (MemberInit.isInvalid()) 1280 return true; 1281 1282 // C++0x [class.base.init]p7: 1283 // The initialization of each base and member constitutes a 1284 // full-expression. 1285 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1286 if (MemberInit.isInvalid()) 1287 return true; 1288 1289 // If we are in a dependent context, template instantiation will 1290 // perform this type-checking again. Just save the arguments that we 1291 // received in a ParenListExpr. 1292 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1293 // of the information that we have about the member 1294 // initializer. However, deconstructing the ASTs is a dicey process, 1295 // and this approach is far more likely to get the corner cases right. 1296 if (CurContext->isDependentContext()) { 1297 // Bump the reference count of all of the arguments. 1298 for (unsigned I = 0; I != NumArgs; ++I) 1299 Args[I]->Retain(); 1300 1301 OwningExprResult Init 1302 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1303 RParenLoc)); 1304 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1305 LParenLoc, 1306 Init.takeAs<Expr>(), 1307 RParenLoc); 1308 } 1309 1310 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1311 LParenLoc, 1312 MemberInit.takeAs<Expr>(), 1313 RParenLoc); 1314} 1315 1316Sema::MemInitResult 1317Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1318 Expr **Args, unsigned NumArgs, 1319 SourceLocation LParenLoc, SourceLocation RParenLoc, 1320 CXXRecordDecl *ClassDecl) { 1321 bool HasDependentArg = false; 1322 for (unsigned i = 0; i < NumArgs; i++) 1323 HasDependentArg |= Args[i]->isTypeDependent(); 1324 1325 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1326 if (BaseType->isDependentType() || HasDependentArg) { 1327 // Can't check initialization for a base of dependent type or when 1328 // any of the arguments are type-dependent expressions. 1329 OwningExprResult BaseInit 1330 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1331 RParenLoc)); 1332 1333 // Erase any temporaries within this evaluation context; we're not 1334 // going to track them in the AST, since we'll be rebuilding the 1335 // ASTs during template instantiation. 1336 ExprTemporaries.erase( 1337 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1338 ExprTemporaries.end()); 1339 1340 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1341 /*IsVirtual=*/false, 1342 LParenLoc, 1343 BaseInit.takeAs<Expr>(), 1344 RParenLoc); 1345 } 1346 1347 if (!BaseType->isRecordType()) 1348 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1349 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1350 1351 // C++ [class.base.init]p2: 1352 // [...] Unless the mem-initializer-id names a nonstatic data 1353 // member of the constructor’s class or a direct or virtual base 1354 // of that class, the mem-initializer is ill-formed. A 1355 // mem-initializer-list can initialize a base class using any 1356 // name that denotes that base class type. 1357 1358 // Check for direct and virtual base classes. 1359 const CXXBaseSpecifier *DirectBaseSpec = 0; 1360 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1361 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1362 VirtualBaseSpec); 1363 1364 // C++ [base.class.init]p2: 1365 // If a mem-initializer-id is ambiguous because it designates both 1366 // a direct non-virtual base class and an inherited virtual base 1367 // class, the mem-initializer is ill-formed. 1368 if (DirectBaseSpec && VirtualBaseSpec) 1369 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1370 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1371 // C++ [base.class.init]p2: 1372 // Unless the mem-initializer-id names a nonstatic data membeer of the 1373 // constructor's class ot a direst or virtual base of that class, the 1374 // mem-initializer is ill-formed. 1375 if (!DirectBaseSpec && !VirtualBaseSpec) 1376 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1377 << BaseType << ClassDecl->getNameAsCString() 1378 << BaseTInfo->getTypeLoc().getSourceRange(); 1379 1380 CXXBaseSpecifier *BaseSpec 1381 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1382 if (!BaseSpec) 1383 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1384 1385 // Initialize the base. 1386 InitializedEntity BaseEntity = 1387 InitializedEntity::InitializeBase(Context, BaseSpec); 1388 InitializationKind Kind = 1389 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1390 1391 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1392 1393 OwningExprResult BaseInit = 1394 InitSeq.Perform(*this, BaseEntity, Kind, 1395 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1396 if (BaseInit.isInvalid()) 1397 return true; 1398 1399 // C++0x [class.base.init]p7: 1400 // The initialization of each base and member constitutes a 1401 // full-expression. 1402 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1403 if (BaseInit.isInvalid()) 1404 return true; 1405 1406 // If we are in a dependent context, template instantiation will 1407 // perform this type-checking again. Just save the arguments that we 1408 // received in a ParenListExpr. 1409 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1410 // of the information that we have about the base 1411 // initializer. However, deconstructing the ASTs is a dicey process, 1412 // and this approach is far more likely to get the corner cases right. 1413 if (CurContext->isDependentContext()) { 1414 // Bump the reference count of all of the arguments. 1415 for (unsigned I = 0; I != NumArgs; ++I) 1416 Args[I]->Retain(); 1417 1418 OwningExprResult Init 1419 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1420 RParenLoc)); 1421 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1422 BaseSpec->isVirtual(), 1423 LParenLoc, 1424 Init.takeAs<Expr>(), 1425 RParenLoc); 1426 } 1427 1428 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1429 BaseSpec->isVirtual(), 1430 LParenLoc, 1431 BaseInit.takeAs<Expr>(), 1432 RParenLoc); 1433} 1434 1435bool 1436Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1437 CXXBaseOrMemberInitializer **Initializers, 1438 unsigned NumInitializers, 1439 bool AnyErrors) { 1440 if (Constructor->getDeclContext()->isDependentContext()) { 1441 // Just store the initializers as written, they will be checked during 1442 // instantiation. 1443 if (NumInitializers > 0) { 1444 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1445 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1446 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1447 memcpy(baseOrMemberInitializers, Initializers, 1448 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1449 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1450 } 1451 1452 return false; 1453 } 1454 1455 // We need to build the initializer AST according to order of construction 1456 // and not what user specified in the Initializers list. 1457 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1458 if (!ClassDecl) 1459 return true; 1460 1461 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1462 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1463 bool HadError = false; 1464 1465 for (unsigned i = 0; i < NumInitializers; i++) { 1466 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1467 1468 if (Member->isBaseInitializer()) 1469 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1470 else 1471 AllBaseFields[Member->getMember()] = Member; 1472 } 1473 1474 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1475 1476 // Push virtual bases before others. 1477 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1478 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1479 1480 if (CXXBaseOrMemberInitializer *Value 1481 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1482 AllToInit.push_back(Value); 1483 } else if (!AnyErrors) { 1484 InitializedEntity InitEntity 1485 = InitializedEntity::InitializeBase(Context, VBase); 1486 InitializationKind InitKind 1487 = InitializationKind::CreateDefault(Constructor->getLocation()); 1488 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1489 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1490 MultiExprArg(*this, 0, 0)); 1491 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1492 if (BaseInit.isInvalid()) { 1493 HadError = true; 1494 continue; 1495 } 1496 1497 CXXBaseOrMemberInitializer *CXXBaseInit = 1498 new (Context) CXXBaseOrMemberInitializer(Context, 1499 Context.getTrivialTypeSourceInfo(VBase->getType(), 1500 SourceLocation()), 1501 /*IsVirtual=*/true, 1502 SourceLocation(), 1503 BaseInit.takeAs<Expr>(), 1504 SourceLocation()); 1505 AllToInit.push_back(CXXBaseInit); 1506 } 1507 } 1508 1509 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1510 E = ClassDecl->bases_end(); Base != E; ++Base) { 1511 // Virtuals are in the virtual base list and already constructed. 1512 if (Base->isVirtual()) 1513 continue; 1514 1515 if (CXXBaseOrMemberInitializer *Value 1516 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1517 AllToInit.push_back(Value); 1518 } else if (!AnyErrors) { 1519 InitializedEntity InitEntity 1520 = InitializedEntity::InitializeBase(Context, Base); 1521 InitializationKind InitKind 1522 = InitializationKind::CreateDefault(Constructor->getLocation()); 1523 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1524 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1525 MultiExprArg(*this, 0, 0)); 1526 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1527 if (BaseInit.isInvalid()) { 1528 HadError = true; 1529 continue; 1530 } 1531 1532 CXXBaseOrMemberInitializer *CXXBaseInit = 1533 new (Context) CXXBaseOrMemberInitializer(Context, 1534 Context.getTrivialTypeSourceInfo(Base->getType(), 1535 SourceLocation()), 1536 /*IsVirtual=*/false, 1537 SourceLocation(), 1538 BaseInit.takeAs<Expr>(), 1539 SourceLocation()); 1540 AllToInit.push_back(CXXBaseInit); 1541 } 1542 } 1543 1544 // non-static data members. 1545 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1546 E = ClassDecl->field_end(); Field != E; ++Field) { 1547 if ((*Field)->isAnonymousStructOrUnion()) { 1548 if (const RecordType *FieldClassType = 1549 Field->getType()->getAs<RecordType>()) { 1550 CXXRecordDecl *FieldClassDecl 1551 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1552 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1553 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1554 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1555 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1556 // set to the anonymous union data member used in the initializer 1557 // list. 1558 Value->setMember(*Field); 1559 Value->setAnonUnionMember(*FA); 1560 AllToInit.push_back(Value); 1561 break; 1562 } 1563 } 1564 } 1565 continue; 1566 } 1567 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1568 AllToInit.push_back(Value); 1569 continue; 1570 } 1571 1572 if ((*Field)->getType()->isDependentType() || AnyErrors) 1573 continue; 1574 1575 QualType FT = Context.getBaseElementType((*Field)->getType()); 1576 if (FT->getAs<RecordType>()) { 1577 InitializedEntity InitEntity 1578 = InitializedEntity::InitializeMember(*Field); 1579 InitializationKind InitKind 1580 = InitializationKind::CreateDefault(Constructor->getLocation()); 1581 1582 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1583 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1584 MultiExprArg(*this, 0, 0)); 1585 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1586 if (MemberInit.isInvalid()) { 1587 HadError = true; 1588 continue; 1589 } 1590 1591 // Don't attach synthesized member initializers in a dependent 1592 // context; they'll be regenerated a template instantiation 1593 // time. 1594 if (CurContext->isDependentContext()) 1595 continue; 1596 1597 CXXBaseOrMemberInitializer *Member = 1598 new (Context) CXXBaseOrMemberInitializer(Context, 1599 *Field, SourceLocation(), 1600 SourceLocation(), 1601 MemberInit.takeAs<Expr>(), 1602 SourceLocation()); 1603 1604 AllToInit.push_back(Member); 1605 } 1606 else if (FT->isReferenceType()) { 1607 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1608 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1609 << 0 << (*Field)->getDeclName(); 1610 Diag((*Field)->getLocation(), diag::note_declared_at); 1611 HadError = true; 1612 } 1613 else if (FT.isConstQualified()) { 1614 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1615 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1616 << 1 << (*Field)->getDeclName(); 1617 Diag((*Field)->getLocation(), diag::note_declared_at); 1618 HadError = true; 1619 } 1620 } 1621 1622 NumInitializers = AllToInit.size(); 1623 if (NumInitializers > 0) { 1624 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1625 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1626 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1627 memcpy(baseOrMemberInitializers, AllToInit.data(), 1628 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1629 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1630 1631 // Constructors implicitly reference the base and member 1632 // destructors. 1633 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1634 Constructor->getParent()); 1635 } 1636 1637 return HadError; 1638} 1639 1640static void *GetKeyForTopLevelField(FieldDecl *Field) { 1641 // For anonymous unions, use the class declaration as the key. 1642 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1643 if (RT->getDecl()->isAnonymousStructOrUnion()) 1644 return static_cast<void *>(RT->getDecl()); 1645 } 1646 return static_cast<void *>(Field); 1647} 1648 1649static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1650 return Context.getCanonicalType(BaseType).getTypePtr(); 1651} 1652 1653static void *GetKeyForMember(ASTContext &Context, 1654 CXXBaseOrMemberInitializer *Member, 1655 bool MemberMaybeAnon = false) { 1656 if (!Member->isMemberInitializer()) 1657 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1658 1659 // For fields injected into the class via declaration of an anonymous union, 1660 // use its anonymous union class declaration as the unique key. 1661 FieldDecl *Field = Member->getMember(); 1662 1663 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1664 // data member of the class. Data member used in the initializer list is 1665 // in AnonUnionMember field. 1666 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1667 Field = Member->getAnonUnionMember(); 1668 1669 // If the field is a member of an anonymous struct or union, our key 1670 // is the anonymous record decl that's a direct child of the class. 1671 RecordDecl *RD = Field->getParent(); 1672 if (RD->isAnonymousStructOrUnion()) { 1673 while (true) { 1674 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1675 if (Parent->isAnonymousStructOrUnion()) 1676 RD = Parent; 1677 else 1678 break; 1679 } 1680 1681 return static_cast<void *>(RD); 1682 } 1683 1684 return static_cast<void *>(Field); 1685} 1686 1687static void 1688DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1689 const CXXConstructorDecl *Constructor, 1690 CXXBaseOrMemberInitializer **Inits, 1691 unsigned NumInits) { 1692 if (Constructor->getDeclContext()->isDependentContext()) 1693 return; 1694 1695 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1696 == Diagnostic::Ignored) 1697 return; 1698 1699 // Build the list of bases and members in the order that they'll 1700 // actually be initialized. The explicit initializers should be in 1701 // this same order but may be missing things. 1702 llvm::SmallVector<const void*, 32> IdealInitKeys; 1703 1704 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1705 1706 // 1. Virtual bases. 1707 for (CXXRecordDecl::base_class_const_iterator VBase = 1708 ClassDecl->vbases_begin(), 1709 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1710 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1711 1712 // 2. Non-virtual bases. 1713 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1714 E = ClassDecl->bases_end(); Base != E; ++Base) { 1715 if (Base->isVirtual()) 1716 continue; 1717 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1718 } 1719 1720 // 3. Direct fields. 1721 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1722 E = ClassDecl->field_end(); Field != E; ++Field) 1723 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1724 1725 unsigned NumIdealInits = IdealInitKeys.size(); 1726 unsigned IdealIndex = 0; 1727 1728 CXXBaseOrMemberInitializer *PrevInit = 0; 1729 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1730 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1731 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1732 1733 // Scan forward to try to find this initializer in the idealized 1734 // initializers list. 1735 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1736 if (InitKey == IdealInitKeys[IdealIndex]) 1737 break; 1738 1739 // If we didn't find this initializer, it must be because we 1740 // scanned past it on a previous iteration. That can only 1741 // happen if we're out of order; emit a warning. 1742 if (IdealIndex == NumIdealInits) { 1743 assert(PrevInit && "initializer not found in initializer list"); 1744 1745 Sema::SemaDiagnosticBuilder D = 1746 SemaRef.Diag(PrevInit->getSourceLocation(), 1747 diag::warn_initializer_out_of_order); 1748 1749 if (PrevInit->isMemberInitializer()) 1750 D << 0 << PrevInit->getMember()->getDeclName(); 1751 else 1752 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1753 1754 if (Init->isMemberInitializer()) 1755 D << 0 << Init->getMember()->getDeclName(); 1756 else 1757 D << 1 << Init->getBaseClassInfo()->getType(); 1758 1759 // Move back to the initializer's location in the ideal list. 1760 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1761 if (InitKey == IdealInitKeys[IdealIndex]) 1762 break; 1763 1764 assert(IdealIndex != NumIdealInits && 1765 "initializer not found in initializer list"); 1766 } 1767 1768 PrevInit = Init; 1769 } 1770} 1771 1772namespace { 1773bool CheckRedundantInit(Sema &S, 1774 CXXBaseOrMemberInitializer *Init, 1775 CXXBaseOrMemberInitializer *&PrevInit) { 1776 if (!PrevInit) { 1777 PrevInit = Init; 1778 return false; 1779 } 1780 1781 if (FieldDecl *Field = Init->getMember()) 1782 S.Diag(Init->getSourceLocation(), 1783 diag::err_multiple_mem_initialization) 1784 << Field->getDeclName() 1785 << Init->getSourceRange(); 1786 else { 1787 Type *BaseClass = Init->getBaseClass(); 1788 assert(BaseClass && "neither field nor base"); 1789 S.Diag(Init->getSourceLocation(), 1790 diag::err_multiple_base_initialization) 1791 << QualType(BaseClass, 0) 1792 << Init->getSourceRange(); 1793 } 1794 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1795 << 0 << PrevInit->getSourceRange(); 1796 1797 return true; 1798} 1799 1800typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1801typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1802 1803bool CheckRedundantUnionInit(Sema &S, 1804 CXXBaseOrMemberInitializer *Init, 1805 RedundantUnionMap &Unions) { 1806 FieldDecl *Field = Init->getMember(); 1807 RecordDecl *Parent = Field->getParent(); 1808 if (!Parent->isAnonymousStructOrUnion()) 1809 return false; 1810 1811 NamedDecl *Child = Field; 1812 do { 1813 if (Parent->isUnion()) { 1814 UnionEntry &En = Unions[Parent]; 1815 if (En.first && En.first != Child) { 1816 S.Diag(Init->getSourceLocation(), 1817 diag::err_multiple_mem_union_initialization) 1818 << Field->getDeclName() 1819 << Init->getSourceRange(); 1820 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1821 << 0 << En.second->getSourceRange(); 1822 return true; 1823 } else if (!En.first) { 1824 En.first = Child; 1825 En.second = Init; 1826 } 1827 } 1828 1829 Child = Parent; 1830 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1831 } while (Parent->isAnonymousStructOrUnion()); 1832 1833 return false; 1834} 1835} 1836 1837/// ActOnMemInitializers - Handle the member initializers for a constructor. 1838void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1839 SourceLocation ColonLoc, 1840 MemInitTy **meminits, unsigned NumMemInits, 1841 bool AnyErrors) { 1842 if (!ConstructorDecl) 1843 return; 1844 1845 AdjustDeclIfTemplate(ConstructorDecl); 1846 1847 CXXConstructorDecl *Constructor 1848 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1849 1850 if (!Constructor) { 1851 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1852 return; 1853 } 1854 1855 CXXBaseOrMemberInitializer **MemInits = 1856 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1857 1858 // Mapping for the duplicate initializers check. 1859 // For member initializers, this is keyed with a FieldDecl*. 1860 // For base initializers, this is keyed with a Type*. 1861 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1862 1863 // Mapping for the inconsistent anonymous-union initializers check. 1864 RedundantUnionMap MemberUnions; 1865 1866 bool HadError = false; 1867 for (unsigned i = 0; i < NumMemInits; i++) { 1868 CXXBaseOrMemberInitializer *Init = MemInits[i]; 1869 1870 if (Init->isMemberInitializer()) { 1871 FieldDecl *Field = Init->getMember(); 1872 if (CheckRedundantInit(*this, Init, Members[Field]) || 1873 CheckRedundantUnionInit(*this, Init, MemberUnions)) 1874 HadError = true; 1875 } else { 1876 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 1877 if (CheckRedundantInit(*this, Init, Members[Key])) 1878 HadError = true; 1879 } 1880 } 1881 1882 if (HadError) 1883 return; 1884 1885 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1886 1887 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1888} 1889 1890void 1891Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1892 CXXRecordDecl *ClassDecl) { 1893 // Ignore dependent contexts. 1894 if (ClassDecl->isDependentContext()) 1895 return; 1896 1897 // FIXME: all the access-control diagnostics are positioned on the 1898 // field/base declaration. That's probably good; that said, the 1899 // user might reasonably want to know why the destructor is being 1900 // emitted, and we currently don't say. 1901 1902 // Non-static data members. 1903 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1904 E = ClassDecl->field_end(); I != E; ++I) { 1905 FieldDecl *Field = *I; 1906 1907 QualType FieldType = Context.getBaseElementType(Field->getType()); 1908 1909 const RecordType* RT = FieldType->getAs<RecordType>(); 1910 if (!RT) 1911 continue; 1912 1913 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1914 if (FieldClassDecl->hasTrivialDestructor()) 1915 continue; 1916 1917 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1918 CheckDestructorAccess(Field->getLocation(), Dtor, 1919 PDiag(diag::err_access_dtor_field) 1920 << Field->getDeclName() 1921 << FieldType); 1922 1923 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1924 } 1925 1926 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1927 1928 // Bases. 1929 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1930 E = ClassDecl->bases_end(); Base != E; ++Base) { 1931 // Bases are always records in a well-formed non-dependent class. 1932 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1933 1934 // Remember direct virtual bases. 1935 if (Base->isVirtual()) 1936 DirectVirtualBases.insert(RT); 1937 1938 // Ignore trivial destructors. 1939 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1940 if (BaseClassDecl->hasTrivialDestructor()) 1941 continue; 1942 1943 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1944 1945 // FIXME: caret should be on the start of the class name 1946 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1947 PDiag(diag::err_access_dtor_base) 1948 << Base->getType() 1949 << Base->getSourceRange()); 1950 1951 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1952 } 1953 1954 // Virtual bases. 1955 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1956 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1957 1958 // Bases are always records in a well-formed non-dependent class. 1959 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1960 1961 // Ignore direct virtual bases. 1962 if (DirectVirtualBases.count(RT)) 1963 continue; 1964 1965 // Ignore trivial destructors. 1966 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1967 if (BaseClassDecl->hasTrivialDestructor()) 1968 continue; 1969 1970 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1971 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1972 PDiag(diag::err_access_dtor_vbase) 1973 << VBase->getType()); 1974 1975 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1976 } 1977} 1978 1979void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1980 if (!CDtorDecl) 1981 return; 1982 1983 if (CXXConstructorDecl *Constructor 1984 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1985 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 1986} 1987 1988bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1989 unsigned DiagID, AbstractDiagSelID SelID, 1990 const CXXRecordDecl *CurrentRD) { 1991 if (SelID == -1) 1992 return RequireNonAbstractType(Loc, T, 1993 PDiag(DiagID), CurrentRD); 1994 else 1995 return RequireNonAbstractType(Loc, T, 1996 PDiag(DiagID) << SelID, CurrentRD); 1997} 1998 1999bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2000 const PartialDiagnostic &PD, 2001 const CXXRecordDecl *CurrentRD) { 2002 if (!getLangOptions().CPlusPlus) 2003 return false; 2004 2005 if (const ArrayType *AT = Context.getAsArrayType(T)) 2006 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2007 CurrentRD); 2008 2009 if (const PointerType *PT = T->getAs<PointerType>()) { 2010 // Find the innermost pointer type. 2011 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2012 PT = T; 2013 2014 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2015 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2016 } 2017 2018 const RecordType *RT = T->getAs<RecordType>(); 2019 if (!RT) 2020 return false; 2021 2022 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2023 2024 if (CurrentRD && CurrentRD != RD) 2025 return false; 2026 2027 // FIXME: is this reasonable? It matches current behavior, but.... 2028 if (!RD->getDefinition()) 2029 return false; 2030 2031 if (!RD->isAbstract()) 2032 return false; 2033 2034 Diag(Loc, PD) << RD->getDeclName(); 2035 2036 // Check if we've already emitted the list of pure virtual functions for this 2037 // class. 2038 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2039 return true; 2040 2041 CXXFinalOverriderMap FinalOverriders; 2042 RD->getFinalOverriders(FinalOverriders); 2043 2044 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2045 MEnd = FinalOverriders.end(); 2046 M != MEnd; 2047 ++M) { 2048 for (OverridingMethods::iterator SO = M->second.begin(), 2049 SOEnd = M->second.end(); 2050 SO != SOEnd; ++SO) { 2051 // C++ [class.abstract]p4: 2052 // A class is abstract if it contains or inherits at least one 2053 // pure virtual function for which the final overrider is pure 2054 // virtual. 2055 2056 // 2057 if (SO->second.size() != 1) 2058 continue; 2059 2060 if (!SO->second.front().Method->isPure()) 2061 continue; 2062 2063 Diag(SO->second.front().Method->getLocation(), 2064 diag::note_pure_virtual_function) 2065 << SO->second.front().Method->getDeclName(); 2066 } 2067 } 2068 2069 if (!PureVirtualClassDiagSet) 2070 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2071 PureVirtualClassDiagSet->insert(RD); 2072 2073 return true; 2074} 2075 2076namespace { 2077 class AbstractClassUsageDiagnoser 2078 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2079 Sema &SemaRef; 2080 CXXRecordDecl *AbstractClass; 2081 2082 bool VisitDeclContext(const DeclContext *DC) { 2083 bool Invalid = false; 2084 2085 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2086 E = DC->decls_end(); I != E; ++I) 2087 Invalid |= Visit(*I); 2088 2089 return Invalid; 2090 } 2091 2092 public: 2093 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2094 : SemaRef(SemaRef), AbstractClass(ac) { 2095 Visit(SemaRef.Context.getTranslationUnitDecl()); 2096 } 2097 2098 bool VisitFunctionDecl(const FunctionDecl *FD) { 2099 if (FD->isThisDeclarationADefinition()) { 2100 // No need to do the check if we're in a definition, because it requires 2101 // that the return/param types are complete. 2102 // because that requires 2103 return VisitDeclContext(FD); 2104 } 2105 2106 // Check the return type. 2107 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2108 bool Invalid = 2109 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2110 diag::err_abstract_type_in_decl, 2111 Sema::AbstractReturnType, 2112 AbstractClass); 2113 2114 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2115 E = FD->param_end(); I != E; ++I) { 2116 const ParmVarDecl *VD = *I; 2117 Invalid |= 2118 SemaRef.RequireNonAbstractType(VD->getLocation(), 2119 VD->getOriginalType(), 2120 diag::err_abstract_type_in_decl, 2121 Sema::AbstractParamType, 2122 AbstractClass); 2123 } 2124 2125 return Invalid; 2126 } 2127 2128 bool VisitDecl(const Decl* D) { 2129 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2130 return VisitDeclContext(DC); 2131 2132 return false; 2133 } 2134 }; 2135} 2136 2137/// \brief Perform semantic checks on a class definition that has been 2138/// completing, introducing implicitly-declared members, checking for 2139/// abstract types, etc. 2140void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2141 if (!Record || Record->isInvalidDecl()) 2142 return; 2143 2144 if (!Record->isDependentType()) 2145 AddImplicitlyDeclaredMembersToClass(S, Record); 2146 2147 if (Record->isInvalidDecl()) 2148 return; 2149 2150 // Set access bits correctly on the directly-declared conversions. 2151 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2152 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2153 Convs->setAccess(I, (*I)->getAccess()); 2154 2155 // Determine whether we need to check for final overriders. We do 2156 // this either when there are virtual base classes (in which case we 2157 // may end up finding multiple final overriders for a given virtual 2158 // function) or any of the base classes is abstract (in which case 2159 // we might detect that this class is abstract). 2160 bool CheckFinalOverriders = false; 2161 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2162 !Record->isDependentType()) { 2163 if (Record->getNumVBases()) 2164 CheckFinalOverriders = true; 2165 else if (!Record->isAbstract()) { 2166 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2167 BEnd = Record->bases_end(); 2168 B != BEnd; ++B) { 2169 CXXRecordDecl *BaseDecl 2170 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2171 if (BaseDecl->isAbstract()) { 2172 CheckFinalOverriders = true; 2173 break; 2174 } 2175 } 2176 } 2177 } 2178 2179 if (CheckFinalOverriders) { 2180 CXXFinalOverriderMap FinalOverriders; 2181 Record->getFinalOverriders(FinalOverriders); 2182 2183 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2184 MEnd = FinalOverriders.end(); 2185 M != MEnd; ++M) { 2186 for (OverridingMethods::iterator SO = M->second.begin(), 2187 SOEnd = M->second.end(); 2188 SO != SOEnd; ++SO) { 2189 assert(SO->second.size() > 0 && 2190 "All virtual functions have overridding virtual functions"); 2191 if (SO->second.size() == 1) { 2192 // C++ [class.abstract]p4: 2193 // A class is abstract if it contains or inherits at least one 2194 // pure virtual function for which the final overrider is pure 2195 // virtual. 2196 if (SO->second.front().Method->isPure()) 2197 Record->setAbstract(true); 2198 continue; 2199 } 2200 2201 // C++ [class.virtual]p2: 2202 // In a derived class, if a virtual member function of a base 2203 // class subobject has more than one final overrider the 2204 // program is ill-formed. 2205 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2206 << (NamedDecl *)M->first << Record; 2207 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2208 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2209 OMEnd = SO->second.end(); 2210 OM != OMEnd; ++OM) 2211 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2212 << (NamedDecl *)M->first << OM->Method->getParent(); 2213 2214 Record->setInvalidDecl(); 2215 } 2216 } 2217 } 2218 2219 if (Record->isAbstract() && !Record->isInvalidDecl()) 2220 (void)AbstractClassUsageDiagnoser(*this, Record); 2221 2222 // If this is not an aggregate type and has no user-declared constructor, 2223 // complain about any non-static data members of reference or const scalar 2224 // type, since they will never get initializers. 2225 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2226 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2227 bool Complained = false; 2228 for (RecordDecl::field_iterator F = Record->field_begin(), 2229 FEnd = Record->field_end(); 2230 F != FEnd; ++F) { 2231 if (F->getType()->isReferenceType() || 2232 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2233 if (!Complained) { 2234 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2235 << Record->getTagKind() << Record; 2236 Complained = true; 2237 } 2238 2239 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2240 << F->getType()->isReferenceType() 2241 << F->getDeclName(); 2242 } 2243 } 2244 } 2245} 2246 2247void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2248 DeclPtrTy TagDecl, 2249 SourceLocation LBrac, 2250 SourceLocation RBrac, 2251 AttributeList *AttrList) { 2252 if (!TagDecl) 2253 return; 2254 2255 AdjustDeclIfTemplate(TagDecl); 2256 2257 ActOnFields(S, RLoc, TagDecl, 2258 (DeclPtrTy*)FieldCollector->getCurFields(), 2259 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2260 2261 CheckCompletedCXXClass(S, 2262 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2263} 2264 2265/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2266/// special functions, such as the default constructor, copy 2267/// constructor, or destructor, to the given C++ class (C++ 2268/// [special]p1). This routine can only be executed just before the 2269/// definition of the class is complete. 2270/// 2271/// The scope, if provided, is the class scope. 2272void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2273 CXXRecordDecl *ClassDecl) { 2274 CanQualType ClassType 2275 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2276 2277 // FIXME: Implicit declarations have exception specifications, which are 2278 // the union of the specifications of the implicitly called functions. 2279 2280 if (!ClassDecl->hasUserDeclaredConstructor()) { 2281 // C++ [class.ctor]p5: 2282 // A default constructor for a class X is a constructor of class X 2283 // that can be called without an argument. If there is no 2284 // user-declared constructor for class X, a default constructor is 2285 // implicitly declared. An implicitly-declared default constructor 2286 // is an inline public member of its class. 2287 DeclarationName Name 2288 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2289 CXXConstructorDecl *DefaultCon = 2290 CXXConstructorDecl::Create(Context, ClassDecl, 2291 ClassDecl->getLocation(), Name, 2292 Context.getFunctionType(Context.VoidTy, 2293 0, 0, false, 0, 2294 /*FIXME*/false, false, 2295 0, 0, 2296 FunctionType::ExtInfo()), 2297 /*TInfo=*/0, 2298 /*isExplicit=*/false, 2299 /*isInline=*/true, 2300 /*isImplicitlyDeclared=*/true); 2301 DefaultCon->setAccess(AS_public); 2302 DefaultCon->setImplicit(); 2303 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2304 if (S) 2305 PushOnScopeChains(DefaultCon, S, true); 2306 else 2307 ClassDecl->addDecl(DefaultCon); 2308 } 2309 2310 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2311 // C++ [class.copy]p4: 2312 // If the class definition does not explicitly declare a copy 2313 // constructor, one is declared implicitly. 2314 2315 // C++ [class.copy]p5: 2316 // The implicitly-declared copy constructor for a class X will 2317 // have the form 2318 // 2319 // X::X(const X&) 2320 // 2321 // if 2322 bool HasConstCopyConstructor = true; 2323 2324 // -- each direct or virtual base class B of X has a copy 2325 // constructor whose first parameter is of type const B& or 2326 // const volatile B&, and 2327 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2328 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2329 const CXXRecordDecl *BaseClassDecl 2330 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2331 HasConstCopyConstructor 2332 = BaseClassDecl->hasConstCopyConstructor(Context); 2333 } 2334 2335 // -- for all the nonstatic data members of X that are of a 2336 // class type M (or array thereof), each such class type 2337 // has a copy constructor whose first parameter is of type 2338 // const M& or const volatile M&. 2339 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2340 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2341 ++Field) { 2342 QualType FieldType = (*Field)->getType(); 2343 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2344 FieldType = Array->getElementType(); 2345 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2346 const CXXRecordDecl *FieldClassDecl 2347 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2348 HasConstCopyConstructor 2349 = FieldClassDecl->hasConstCopyConstructor(Context); 2350 } 2351 } 2352 2353 // Otherwise, the implicitly declared copy constructor will have 2354 // the form 2355 // 2356 // X::X(X&) 2357 QualType ArgType = ClassType; 2358 if (HasConstCopyConstructor) 2359 ArgType = ArgType.withConst(); 2360 ArgType = Context.getLValueReferenceType(ArgType); 2361 2362 // An implicitly-declared copy constructor is an inline public 2363 // member of its class. 2364 DeclarationName Name 2365 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2366 CXXConstructorDecl *CopyConstructor 2367 = CXXConstructorDecl::Create(Context, ClassDecl, 2368 ClassDecl->getLocation(), Name, 2369 Context.getFunctionType(Context.VoidTy, 2370 &ArgType, 1, 2371 false, 0, 2372 /*FIXME:*/false, 2373 false, 0, 0, 2374 FunctionType::ExtInfo()), 2375 /*TInfo=*/0, 2376 /*isExplicit=*/false, 2377 /*isInline=*/true, 2378 /*isImplicitlyDeclared=*/true); 2379 CopyConstructor->setAccess(AS_public); 2380 CopyConstructor->setImplicit(); 2381 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2382 2383 // Add the parameter to the constructor. 2384 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2385 ClassDecl->getLocation(), 2386 /*IdentifierInfo=*/0, 2387 ArgType, /*TInfo=*/0, 2388 VarDecl::None, 0); 2389 CopyConstructor->setParams(&FromParam, 1); 2390 if (S) 2391 PushOnScopeChains(CopyConstructor, S, true); 2392 else 2393 ClassDecl->addDecl(CopyConstructor); 2394 } 2395 2396 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2397 // Note: The following rules are largely analoguous to the copy 2398 // constructor rules. Note that virtual bases are not taken into account 2399 // for determining the argument type of the operator. Note also that 2400 // operators taking an object instead of a reference are allowed. 2401 // 2402 // C++ [class.copy]p10: 2403 // If the class definition does not explicitly declare a copy 2404 // assignment operator, one is declared implicitly. 2405 // The implicitly-defined copy assignment operator for a class X 2406 // will have the form 2407 // 2408 // X& X::operator=(const X&) 2409 // 2410 // if 2411 bool HasConstCopyAssignment = true; 2412 2413 // -- each direct base class B of X has a copy assignment operator 2414 // whose parameter is of type const B&, const volatile B& or B, 2415 // and 2416 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2417 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2418 assert(!Base->getType()->isDependentType() && 2419 "Cannot generate implicit members for class with dependent bases."); 2420 const CXXRecordDecl *BaseClassDecl 2421 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2422 const CXXMethodDecl *MD = 0; 2423 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2424 MD); 2425 } 2426 2427 // -- for all the nonstatic data members of X that are of a class 2428 // type M (or array thereof), each such class type has a copy 2429 // assignment operator whose parameter is of type const M&, 2430 // const volatile M& or M. 2431 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2432 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2433 ++Field) { 2434 QualType FieldType = (*Field)->getType(); 2435 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2436 FieldType = Array->getElementType(); 2437 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2438 const CXXRecordDecl *FieldClassDecl 2439 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2440 const CXXMethodDecl *MD = 0; 2441 HasConstCopyAssignment 2442 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2443 } 2444 } 2445 2446 // Otherwise, the implicitly declared copy assignment operator will 2447 // have the form 2448 // 2449 // X& X::operator=(X&) 2450 QualType ArgType = ClassType; 2451 QualType RetType = Context.getLValueReferenceType(ArgType); 2452 if (HasConstCopyAssignment) 2453 ArgType = ArgType.withConst(); 2454 ArgType = Context.getLValueReferenceType(ArgType); 2455 2456 // An implicitly-declared copy assignment operator is an inline public 2457 // member of its class. 2458 DeclarationName Name = 2459 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2460 CXXMethodDecl *CopyAssignment = 2461 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2462 Context.getFunctionType(RetType, &ArgType, 1, 2463 false, 0, 2464 /*FIXME:*/false, 2465 false, 0, 0, 2466 FunctionType::ExtInfo()), 2467 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2468 CopyAssignment->setAccess(AS_public); 2469 CopyAssignment->setImplicit(); 2470 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2471 CopyAssignment->setCopyAssignment(true); 2472 2473 // Add the parameter to the operator. 2474 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2475 ClassDecl->getLocation(), 2476 /*IdentifierInfo=*/0, 2477 ArgType, /*TInfo=*/0, 2478 VarDecl::None, 0); 2479 CopyAssignment->setParams(&FromParam, 1); 2480 2481 // Don't call addedAssignmentOperator. There is no way to distinguish an 2482 // implicit from an explicit assignment operator. 2483 if (S) 2484 PushOnScopeChains(CopyAssignment, S, true); 2485 else 2486 ClassDecl->addDecl(CopyAssignment); 2487 AddOverriddenMethods(ClassDecl, CopyAssignment); 2488 } 2489 2490 if (!ClassDecl->hasUserDeclaredDestructor()) { 2491 // C++ [class.dtor]p2: 2492 // If a class has no user-declared destructor, a destructor is 2493 // declared implicitly. An implicitly-declared destructor is an 2494 // inline public member of its class. 2495 QualType Ty = Context.getFunctionType(Context.VoidTy, 2496 0, 0, false, 0, 2497 /*FIXME:*/false, 2498 false, 0, 0, FunctionType::ExtInfo()); 2499 2500 DeclarationName Name 2501 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2502 CXXDestructorDecl *Destructor 2503 = CXXDestructorDecl::Create(Context, ClassDecl, 2504 ClassDecl->getLocation(), Name, Ty, 2505 /*isInline=*/true, 2506 /*isImplicitlyDeclared=*/true); 2507 Destructor->setAccess(AS_public); 2508 Destructor->setImplicit(); 2509 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2510 if (S) 2511 PushOnScopeChains(Destructor, S, true); 2512 else 2513 ClassDecl->addDecl(Destructor); 2514 2515 // This could be uniqued if it ever proves significant. 2516 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2517 2518 AddOverriddenMethods(ClassDecl, Destructor); 2519 } 2520} 2521 2522void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2523 Decl *D = TemplateD.getAs<Decl>(); 2524 if (!D) 2525 return; 2526 2527 TemplateParameterList *Params = 0; 2528 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2529 Params = Template->getTemplateParameters(); 2530 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2531 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2532 Params = PartialSpec->getTemplateParameters(); 2533 else 2534 return; 2535 2536 for (TemplateParameterList::iterator Param = Params->begin(), 2537 ParamEnd = Params->end(); 2538 Param != ParamEnd; ++Param) { 2539 NamedDecl *Named = cast<NamedDecl>(*Param); 2540 if (Named->getDeclName()) { 2541 S->AddDecl(DeclPtrTy::make(Named)); 2542 IdResolver.AddDecl(Named); 2543 } 2544 } 2545} 2546 2547void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2548 if (!RecordD) return; 2549 AdjustDeclIfTemplate(RecordD); 2550 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2551 PushDeclContext(S, Record); 2552} 2553 2554void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2555 if (!RecordD) return; 2556 PopDeclContext(); 2557} 2558 2559/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2560/// parsing a top-level (non-nested) C++ class, and we are now 2561/// parsing those parts of the given Method declaration that could 2562/// not be parsed earlier (C++ [class.mem]p2), such as default 2563/// arguments. This action should enter the scope of the given 2564/// Method declaration as if we had just parsed the qualified method 2565/// name. However, it should not bring the parameters into scope; 2566/// that will be performed by ActOnDelayedCXXMethodParameter. 2567void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2568} 2569 2570/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2571/// C++ method declaration. We're (re-)introducing the given 2572/// function parameter into scope for use in parsing later parts of 2573/// the method declaration. For example, we could see an 2574/// ActOnParamDefaultArgument event for this parameter. 2575void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2576 if (!ParamD) 2577 return; 2578 2579 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2580 2581 // If this parameter has an unparsed default argument, clear it out 2582 // to make way for the parsed default argument. 2583 if (Param->hasUnparsedDefaultArg()) 2584 Param->setDefaultArg(0); 2585 2586 S->AddDecl(DeclPtrTy::make(Param)); 2587 if (Param->getDeclName()) 2588 IdResolver.AddDecl(Param); 2589} 2590 2591/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2592/// processing the delayed method declaration for Method. The method 2593/// declaration is now considered finished. There may be a separate 2594/// ActOnStartOfFunctionDef action later (not necessarily 2595/// immediately!) for this method, if it was also defined inside the 2596/// class body. 2597void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2598 if (!MethodD) 2599 return; 2600 2601 AdjustDeclIfTemplate(MethodD); 2602 2603 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2604 2605 // Now that we have our default arguments, check the constructor 2606 // again. It could produce additional diagnostics or affect whether 2607 // the class has implicitly-declared destructors, among other 2608 // things. 2609 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2610 CheckConstructor(Constructor); 2611 2612 // Check the default arguments, which we may have added. 2613 if (!Method->isInvalidDecl()) 2614 CheckCXXDefaultArguments(Method); 2615} 2616 2617/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2618/// the well-formedness of the constructor declarator @p D with type @p 2619/// R. If there are any errors in the declarator, this routine will 2620/// emit diagnostics and set the invalid bit to true. In any case, the type 2621/// will be updated to reflect a well-formed type for the constructor and 2622/// returned. 2623QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2624 FunctionDecl::StorageClass &SC) { 2625 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2626 2627 // C++ [class.ctor]p3: 2628 // A constructor shall not be virtual (10.3) or static (9.4). A 2629 // constructor can be invoked for a const, volatile or const 2630 // volatile object. A constructor shall not be declared const, 2631 // volatile, or const volatile (9.3.2). 2632 if (isVirtual) { 2633 if (!D.isInvalidType()) 2634 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2635 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2636 << SourceRange(D.getIdentifierLoc()); 2637 D.setInvalidType(); 2638 } 2639 if (SC == FunctionDecl::Static) { 2640 if (!D.isInvalidType()) 2641 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2642 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2643 << SourceRange(D.getIdentifierLoc()); 2644 D.setInvalidType(); 2645 SC = FunctionDecl::None; 2646 } 2647 2648 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2649 if (FTI.TypeQuals != 0) { 2650 if (FTI.TypeQuals & Qualifiers::Const) 2651 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2652 << "const" << SourceRange(D.getIdentifierLoc()); 2653 if (FTI.TypeQuals & Qualifiers::Volatile) 2654 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2655 << "volatile" << SourceRange(D.getIdentifierLoc()); 2656 if (FTI.TypeQuals & Qualifiers::Restrict) 2657 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2658 << "restrict" << SourceRange(D.getIdentifierLoc()); 2659 } 2660 2661 // Rebuild the function type "R" without any type qualifiers (in 2662 // case any of the errors above fired) and with "void" as the 2663 // return type, since constructors don't have return types. We 2664 // *always* have to do this, because GetTypeForDeclarator will 2665 // put in a result type of "int" when none was specified. 2666 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2667 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2668 Proto->getNumArgs(), 2669 Proto->isVariadic(), 0, 2670 Proto->hasExceptionSpec(), 2671 Proto->hasAnyExceptionSpec(), 2672 Proto->getNumExceptions(), 2673 Proto->exception_begin(), 2674 Proto->getExtInfo()); 2675} 2676 2677/// CheckConstructor - Checks a fully-formed constructor for 2678/// well-formedness, issuing any diagnostics required. Returns true if 2679/// the constructor declarator is invalid. 2680void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2681 CXXRecordDecl *ClassDecl 2682 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2683 if (!ClassDecl) 2684 return Constructor->setInvalidDecl(); 2685 2686 // C++ [class.copy]p3: 2687 // A declaration of a constructor for a class X is ill-formed if 2688 // its first parameter is of type (optionally cv-qualified) X and 2689 // either there are no other parameters or else all other 2690 // parameters have default arguments. 2691 if (!Constructor->isInvalidDecl() && 2692 ((Constructor->getNumParams() == 1) || 2693 (Constructor->getNumParams() > 1 && 2694 Constructor->getParamDecl(1)->hasDefaultArg())) && 2695 Constructor->getTemplateSpecializationKind() 2696 != TSK_ImplicitInstantiation) { 2697 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2698 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2699 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2700 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2701 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2702 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2703 2704 // FIXME: Rather that making the constructor invalid, we should endeavor 2705 // to fix the type. 2706 Constructor->setInvalidDecl(); 2707 } 2708 } 2709 2710 // Notify the class that we've added a constructor. In principle we 2711 // don't need to do this for out-of-line declarations; in practice 2712 // we only instantiate the most recent declaration of a method, so 2713 // we have to call this for everything but friends. 2714 if (!Constructor->getFriendObjectKind()) 2715 ClassDecl->addedConstructor(Context, Constructor); 2716} 2717 2718/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2719/// issuing any diagnostics required. Returns true on error. 2720bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2721 CXXRecordDecl *RD = Destructor->getParent(); 2722 2723 if (Destructor->isVirtual()) { 2724 SourceLocation Loc; 2725 2726 if (!Destructor->isImplicit()) 2727 Loc = Destructor->getLocation(); 2728 else 2729 Loc = RD->getLocation(); 2730 2731 // If we have a virtual destructor, look up the deallocation function 2732 FunctionDecl *OperatorDelete = 0; 2733 DeclarationName Name = 2734 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2735 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2736 return true; 2737 2738 Destructor->setOperatorDelete(OperatorDelete); 2739 } 2740 2741 return false; 2742} 2743 2744static inline bool 2745FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2746 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2747 FTI.ArgInfo[0].Param && 2748 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2749} 2750 2751/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2752/// the well-formednes of the destructor declarator @p D with type @p 2753/// R. If there are any errors in the declarator, this routine will 2754/// emit diagnostics and set the declarator to invalid. Even if this happens, 2755/// will be updated to reflect a well-formed type for the destructor and 2756/// returned. 2757QualType Sema::CheckDestructorDeclarator(Declarator &D, 2758 FunctionDecl::StorageClass& SC) { 2759 // C++ [class.dtor]p1: 2760 // [...] A typedef-name that names a class is a class-name 2761 // (7.1.3); however, a typedef-name that names a class shall not 2762 // be used as the identifier in the declarator for a destructor 2763 // declaration. 2764 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2765 if (isa<TypedefType>(DeclaratorType)) { 2766 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2767 << DeclaratorType; 2768 D.setInvalidType(); 2769 } 2770 2771 // C++ [class.dtor]p2: 2772 // A destructor is used to destroy objects of its class type. A 2773 // destructor takes no parameters, and no return type can be 2774 // specified for it (not even void). The address of a destructor 2775 // shall not be taken. A destructor shall not be static. A 2776 // destructor can be invoked for a const, volatile or const 2777 // volatile object. A destructor shall not be declared const, 2778 // volatile or const volatile (9.3.2). 2779 if (SC == FunctionDecl::Static) { 2780 if (!D.isInvalidType()) 2781 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2782 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2783 << SourceRange(D.getIdentifierLoc()); 2784 SC = FunctionDecl::None; 2785 D.setInvalidType(); 2786 } 2787 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2788 // Destructors don't have return types, but the parser will 2789 // happily parse something like: 2790 // 2791 // class X { 2792 // float ~X(); 2793 // }; 2794 // 2795 // The return type will be eliminated later. 2796 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2797 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2798 << SourceRange(D.getIdentifierLoc()); 2799 } 2800 2801 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2802 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2803 if (FTI.TypeQuals & Qualifiers::Const) 2804 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2805 << "const" << SourceRange(D.getIdentifierLoc()); 2806 if (FTI.TypeQuals & Qualifiers::Volatile) 2807 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2808 << "volatile" << SourceRange(D.getIdentifierLoc()); 2809 if (FTI.TypeQuals & Qualifiers::Restrict) 2810 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2811 << "restrict" << SourceRange(D.getIdentifierLoc()); 2812 D.setInvalidType(); 2813 } 2814 2815 // Make sure we don't have any parameters. 2816 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2817 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2818 2819 // Delete the parameters. 2820 FTI.freeArgs(); 2821 D.setInvalidType(); 2822 } 2823 2824 // Make sure the destructor isn't variadic. 2825 if (FTI.isVariadic) { 2826 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2827 D.setInvalidType(); 2828 } 2829 2830 // Rebuild the function type "R" without any type qualifiers or 2831 // parameters (in case any of the errors above fired) and with 2832 // "void" as the return type, since destructors don't have return 2833 // types. We *always* have to do this, because GetTypeForDeclarator 2834 // will put in a result type of "int" when none was specified. 2835 // FIXME: Exceptions! 2836 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2837 false, false, 0, 0, FunctionType::ExtInfo()); 2838} 2839 2840/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2841/// well-formednes of the conversion function declarator @p D with 2842/// type @p R. If there are any errors in the declarator, this routine 2843/// will emit diagnostics and return true. Otherwise, it will return 2844/// false. Either way, the type @p R will be updated to reflect a 2845/// well-formed type for the conversion operator. 2846void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2847 FunctionDecl::StorageClass& SC) { 2848 // C++ [class.conv.fct]p1: 2849 // Neither parameter types nor return type can be specified. The 2850 // type of a conversion function (8.3.5) is "function taking no 2851 // parameter returning conversion-type-id." 2852 if (SC == FunctionDecl::Static) { 2853 if (!D.isInvalidType()) 2854 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2855 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2856 << SourceRange(D.getIdentifierLoc()); 2857 D.setInvalidType(); 2858 SC = FunctionDecl::None; 2859 } 2860 2861 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2862 2863 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2864 // Conversion functions don't have return types, but the parser will 2865 // happily parse something like: 2866 // 2867 // class X { 2868 // float operator bool(); 2869 // }; 2870 // 2871 // The return type will be changed later anyway. 2872 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2873 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2874 << SourceRange(D.getIdentifierLoc()); 2875 D.setInvalidType(); 2876 } 2877 2878 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2879 2880 // Make sure we don't have any parameters. 2881 if (Proto->getNumArgs() > 0) { 2882 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2883 2884 // Delete the parameters. 2885 D.getTypeObject(0).Fun.freeArgs(); 2886 D.setInvalidType(); 2887 } else if (Proto->isVariadic()) { 2888 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2889 D.setInvalidType(); 2890 } 2891 2892 // Diagnose "&operator bool()" and other such nonsense. This 2893 // is actually a gcc extension which we don't support. 2894 if (Proto->getResultType() != ConvType) { 2895 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 2896 << Proto->getResultType(); 2897 D.setInvalidType(); 2898 ConvType = Proto->getResultType(); 2899 } 2900 2901 // C++ [class.conv.fct]p4: 2902 // The conversion-type-id shall not represent a function type nor 2903 // an array type. 2904 if (ConvType->isArrayType()) { 2905 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2906 ConvType = Context.getPointerType(ConvType); 2907 D.setInvalidType(); 2908 } else if (ConvType->isFunctionType()) { 2909 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2910 ConvType = Context.getPointerType(ConvType); 2911 D.setInvalidType(); 2912 } 2913 2914 // Rebuild the function type "R" without any parameters (in case any 2915 // of the errors above fired) and with the conversion type as the 2916 // return type. 2917 if (D.isInvalidType()) { 2918 R = Context.getFunctionType(ConvType, 0, 0, false, 2919 Proto->getTypeQuals(), 2920 Proto->hasExceptionSpec(), 2921 Proto->hasAnyExceptionSpec(), 2922 Proto->getNumExceptions(), 2923 Proto->exception_begin(), 2924 Proto->getExtInfo()); 2925 } 2926 2927 // C++0x explicit conversion operators. 2928 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2929 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2930 diag::warn_explicit_conversion_functions) 2931 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2932} 2933 2934/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2935/// the declaration of the given C++ conversion function. This routine 2936/// is responsible for recording the conversion function in the C++ 2937/// class, if possible. 2938Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2939 assert(Conversion && "Expected to receive a conversion function declaration"); 2940 2941 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2942 2943 // Make sure we aren't redeclaring the conversion function. 2944 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2945 2946 // C++ [class.conv.fct]p1: 2947 // [...] A conversion function is never used to convert a 2948 // (possibly cv-qualified) object to the (possibly cv-qualified) 2949 // same object type (or a reference to it), to a (possibly 2950 // cv-qualified) base class of that type (or a reference to it), 2951 // or to (possibly cv-qualified) void. 2952 // FIXME: Suppress this warning if the conversion function ends up being a 2953 // virtual function that overrides a virtual function in a base class. 2954 QualType ClassType 2955 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2956 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2957 ConvType = ConvTypeRef->getPointeeType(); 2958 if (ConvType->isRecordType()) { 2959 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2960 if (ConvType == ClassType) 2961 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2962 << ClassType; 2963 else if (IsDerivedFrom(ClassType, ConvType)) 2964 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2965 << ClassType << ConvType; 2966 } else if (ConvType->isVoidType()) { 2967 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2968 << ClassType << ConvType; 2969 } 2970 2971 if (Conversion->getPrimaryTemplate()) { 2972 // ignore specializations 2973 } else if (Conversion->getPreviousDeclaration()) { 2974 if (FunctionTemplateDecl *ConversionTemplate 2975 = Conversion->getDescribedFunctionTemplate()) { 2976 if (ClassDecl->replaceConversion( 2977 ConversionTemplate->getPreviousDeclaration(), 2978 ConversionTemplate)) 2979 return DeclPtrTy::make(ConversionTemplate); 2980 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2981 Conversion)) 2982 return DeclPtrTy::make(Conversion); 2983 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2984 } else if (FunctionTemplateDecl *ConversionTemplate 2985 = Conversion->getDescribedFunctionTemplate()) 2986 ClassDecl->addConversionFunction(ConversionTemplate); 2987 else 2988 ClassDecl->addConversionFunction(Conversion); 2989 2990 return DeclPtrTy::make(Conversion); 2991} 2992 2993//===----------------------------------------------------------------------===// 2994// Namespace Handling 2995//===----------------------------------------------------------------------===// 2996 2997/// ActOnStartNamespaceDef - This is called at the start of a namespace 2998/// definition. 2999Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3000 SourceLocation IdentLoc, 3001 IdentifierInfo *II, 3002 SourceLocation LBrace, 3003 AttributeList *AttrList) { 3004 NamespaceDecl *Namespc = 3005 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3006 Namespc->setLBracLoc(LBrace); 3007 3008 Scope *DeclRegionScope = NamespcScope->getParent(); 3009 3010 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3011 3012 if (II) { 3013 // C++ [namespace.def]p2: 3014 // The identifier in an original-namespace-definition shall not have been 3015 // previously defined in the declarative region in which the 3016 // original-namespace-definition appears. The identifier in an 3017 // original-namespace-definition is the name of the namespace. Subsequently 3018 // in that declarative region, it is treated as an original-namespace-name. 3019 3020 NamedDecl *PrevDecl 3021 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3022 ForRedeclaration); 3023 3024 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3025 // This is an extended namespace definition. 3026 // Attach this namespace decl to the chain of extended namespace 3027 // definitions. 3028 OrigNS->setNextNamespace(Namespc); 3029 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3030 3031 // Remove the previous declaration from the scope. 3032 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3033 IdResolver.RemoveDecl(OrigNS); 3034 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3035 } 3036 } else if (PrevDecl) { 3037 // This is an invalid name redefinition. 3038 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3039 << Namespc->getDeclName(); 3040 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3041 Namespc->setInvalidDecl(); 3042 // Continue on to push Namespc as current DeclContext and return it. 3043 } else if (II->isStr("std") && 3044 CurContext->getLookupContext()->isTranslationUnit()) { 3045 // This is the first "real" definition of the namespace "std", so update 3046 // our cache of the "std" namespace to point at this definition. 3047 if (StdNamespace) { 3048 // We had already defined a dummy namespace "std". Link this new 3049 // namespace definition to the dummy namespace "std". 3050 StdNamespace->setNextNamespace(Namespc); 3051 StdNamespace->setLocation(IdentLoc); 3052 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3053 } 3054 3055 // Make our StdNamespace cache point at the first real definition of the 3056 // "std" namespace. 3057 StdNamespace = Namespc; 3058 } 3059 3060 PushOnScopeChains(Namespc, DeclRegionScope); 3061 } else { 3062 // Anonymous namespaces. 3063 assert(Namespc->isAnonymousNamespace()); 3064 3065 // Link the anonymous namespace into its parent. 3066 NamespaceDecl *PrevDecl; 3067 DeclContext *Parent = CurContext->getLookupContext(); 3068 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3069 PrevDecl = TU->getAnonymousNamespace(); 3070 TU->setAnonymousNamespace(Namespc); 3071 } else { 3072 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3073 PrevDecl = ND->getAnonymousNamespace(); 3074 ND->setAnonymousNamespace(Namespc); 3075 } 3076 3077 // Link the anonymous namespace with its previous declaration. 3078 if (PrevDecl) { 3079 assert(PrevDecl->isAnonymousNamespace()); 3080 assert(!PrevDecl->getNextNamespace()); 3081 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3082 PrevDecl->setNextNamespace(Namespc); 3083 } 3084 3085 CurContext->addDecl(Namespc); 3086 3087 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3088 // behaves as if it were replaced by 3089 // namespace unique { /* empty body */ } 3090 // using namespace unique; 3091 // namespace unique { namespace-body } 3092 // where all occurrences of 'unique' in a translation unit are 3093 // replaced by the same identifier and this identifier differs 3094 // from all other identifiers in the entire program. 3095 3096 // We just create the namespace with an empty name and then add an 3097 // implicit using declaration, just like the standard suggests. 3098 // 3099 // CodeGen enforces the "universally unique" aspect by giving all 3100 // declarations semantically contained within an anonymous 3101 // namespace internal linkage. 3102 3103 if (!PrevDecl) { 3104 UsingDirectiveDecl* UD 3105 = UsingDirectiveDecl::Create(Context, CurContext, 3106 /* 'using' */ LBrace, 3107 /* 'namespace' */ SourceLocation(), 3108 /* qualifier */ SourceRange(), 3109 /* NNS */ NULL, 3110 /* identifier */ SourceLocation(), 3111 Namespc, 3112 /* Ancestor */ CurContext); 3113 UD->setImplicit(); 3114 CurContext->addDecl(UD); 3115 } 3116 } 3117 3118 // Although we could have an invalid decl (i.e. the namespace name is a 3119 // redefinition), push it as current DeclContext and try to continue parsing. 3120 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3121 // for the namespace has the declarations that showed up in that particular 3122 // namespace definition. 3123 PushDeclContext(NamespcScope, Namespc); 3124 return DeclPtrTy::make(Namespc); 3125} 3126 3127/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3128/// is a namespace alias, returns the namespace it points to. 3129static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3130 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3131 return AD->getNamespace(); 3132 return dyn_cast_or_null<NamespaceDecl>(D); 3133} 3134 3135/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3136/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3137void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3138 Decl *Dcl = D.getAs<Decl>(); 3139 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3140 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3141 Namespc->setRBracLoc(RBrace); 3142 PopDeclContext(); 3143} 3144 3145Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3146 SourceLocation UsingLoc, 3147 SourceLocation NamespcLoc, 3148 CXXScopeSpec &SS, 3149 SourceLocation IdentLoc, 3150 IdentifierInfo *NamespcName, 3151 AttributeList *AttrList) { 3152 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3153 assert(NamespcName && "Invalid NamespcName."); 3154 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3155 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3156 3157 UsingDirectiveDecl *UDir = 0; 3158 3159 // Lookup namespace name. 3160 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3161 LookupParsedName(R, S, &SS); 3162 if (R.isAmbiguous()) 3163 return DeclPtrTy(); 3164 3165 if (!R.empty()) { 3166 NamedDecl *Named = R.getFoundDecl(); 3167 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3168 && "expected namespace decl"); 3169 // C++ [namespace.udir]p1: 3170 // A using-directive specifies that the names in the nominated 3171 // namespace can be used in the scope in which the 3172 // using-directive appears after the using-directive. During 3173 // unqualified name lookup (3.4.1), the names appear as if they 3174 // were declared in the nearest enclosing namespace which 3175 // contains both the using-directive and the nominated 3176 // namespace. [Note: in this context, "contains" means "contains 3177 // directly or indirectly". ] 3178 3179 // Find enclosing context containing both using-directive and 3180 // nominated namespace. 3181 NamespaceDecl *NS = getNamespaceDecl(Named); 3182 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3183 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3184 CommonAncestor = CommonAncestor->getParent(); 3185 3186 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3187 SS.getRange(), 3188 (NestedNameSpecifier *)SS.getScopeRep(), 3189 IdentLoc, Named, CommonAncestor); 3190 PushUsingDirective(S, UDir); 3191 } else { 3192 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3193 } 3194 3195 // FIXME: We ignore attributes for now. 3196 delete AttrList; 3197 return DeclPtrTy::make(UDir); 3198} 3199 3200void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3201 // If scope has associated entity, then using directive is at namespace 3202 // or translation unit scope. We add UsingDirectiveDecls, into 3203 // it's lookup structure. 3204 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3205 Ctx->addDecl(UDir); 3206 else 3207 // Otherwise it is block-sope. using-directives will affect lookup 3208 // only to the end of scope. 3209 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3210} 3211 3212 3213Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3214 AccessSpecifier AS, 3215 bool HasUsingKeyword, 3216 SourceLocation UsingLoc, 3217 CXXScopeSpec &SS, 3218 UnqualifiedId &Name, 3219 AttributeList *AttrList, 3220 bool IsTypeName, 3221 SourceLocation TypenameLoc) { 3222 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3223 3224 switch (Name.getKind()) { 3225 case UnqualifiedId::IK_Identifier: 3226 case UnqualifiedId::IK_OperatorFunctionId: 3227 case UnqualifiedId::IK_LiteralOperatorId: 3228 case UnqualifiedId::IK_ConversionFunctionId: 3229 break; 3230 3231 case UnqualifiedId::IK_ConstructorName: 3232 case UnqualifiedId::IK_ConstructorTemplateId: 3233 // C++0x inherited constructors. 3234 if (getLangOptions().CPlusPlus0x) break; 3235 3236 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3237 << SS.getRange(); 3238 return DeclPtrTy(); 3239 3240 case UnqualifiedId::IK_DestructorName: 3241 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3242 << SS.getRange(); 3243 return DeclPtrTy(); 3244 3245 case UnqualifiedId::IK_TemplateId: 3246 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3247 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3248 return DeclPtrTy(); 3249 } 3250 3251 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3252 if (!TargetName) 3253 return DeclPtrTy(); 3254 3255 // Warn about using declarations. 3256 // TODO: store that the declaration was written without 'using' and 3257 // talk about access decls instead of using decls in the 3258 // diagnostics. 3259 if (!HasUsingKeyword) { 3260 UsingLoc = Name.getSourceRange().getBegin(); 3261 3262 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3263 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3264 } 3265 3266 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3267 Name.getSourceRange().getBegin(), 3268 TargetName, AttrList, 3269 /* IsInstantiation */ false, 3270 IsTypeName, TypenameLoc); 3271 if (UD) 3272 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3273 3274 return DeclPtrTy::make(UD); 3275} 3276 3277/// Determines whether to create a using shadow decl for a particular 3278/// decl, given the set of decls existing prior to this using lookup. 3279bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3280 const LookupResult &Previous) { 3281 // Diagnose finding a decl which is not from a base class of the 3282 // current class. We do this now because there are cases where this 3283 // function will silently decide not to build a shadow decl, which 3284 // will pre-empt further diagnostics. 3285 // 3286 // We don't need to do this in C++0x because we do the check once on 3287 // the qualifier. 3288 // 3289 // FIXME: diagnose the following if we care enough: 3290 // struct A { int foo; }; 3291 // struct B : A { using A::foo; }; 3292 // template <class T> struct C : A {}; 3293 // template <class T> struct D : C<T> { using B::foo; } // <--- 3294 // This is invalid (during instantiation) in C++03 because B::foo 3295 // resolves to the using decl in B, which is not a base class of D<T>. 3296 // We can't diagnose it immediately because C<T> is an unknown 3297 // specialization. The UsingShadowDecl in D<T> then points directly 3298 // to A::foo, which will look well-formed when we instantiate. 3299 // The right solution is to not collapse the shadow-decl chain. 3300 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3301 DeclContext *OrigDC = Orig->getDeclContext(); 3302 3303 // Handle enums and anonymous structs. 3304 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3305 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3306 while (OrigRec->isAnonymousStructOrUnion()) 3307 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3308 3309 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3310 if (OrigDC == CurContext) { 3311 Diag(Using->getLocation(), 3312 diag::err_using_decl_nested_name_specifier_is_current_class) 3313 << Using->getNestedNameRange(); 3314 Diag(Orig->getLocation(), diag::note_using_decl_target); 3315 return true; 3316 } 3317 3318 Diag(Using->getNestedNameRange().getBegin(), 3319 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3320 << Using->getTargetNestedNameDecl() 3321 << cast<CXXRecordDecl>(CurContext) 3322 << Using->getNestedNameRange(); 3323 Diag(Orig->getLocation(), diag::note_using_decl_target); 3324 return true; 3325 } 3326 } 3327 3328 if (Previous.empty()) return false; 3329 3330 NamedDecl *Target = Orig; 3331 if (isa<UsingShadowDecl>(Target)) 3332 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3333 3334 // If the target happens to be one of the previous declarations, we 3335 // don't have a conflict. 3336 // 3337 // FIXME: but we might be increasing its access, in which case we 3338 // should redeclare it. 3339 NamedDecl *NonTag = 0, *Tag = 0; 3340 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3341 I != E; ++I) { 3342 NamedDecl *D = (*I)->getUnderlyingDecl(); 3343 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3344 return false; 3345 3346 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3347 } 3348 3349 if (Target->isFunctionOrFunctionTemplate()) { 3350 FunctionDecl *FD; 3351 if (isa<FunctionTemplateDecl>(Target)) 3352 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3353 else 3354 FD = cast<FunctionDecl>(Target); 3355 3356 NamedDecl *OldDecl = 0; 3357 switch (CheckOverload(FD, Previous, OldDecl)) { 3358 case Ovl_Overload: 3359 return false; 3360 3361 case Ovl_NonFunction: 3362 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3363 break; 3364 3365 // We found a decl with the exact signature. 3366 case Ovl_Match: 3367 if (isa<UsingShadowDecl>(OldDecl)) { 3368 // Silently ignore the possible conflict. 3369 return false; 3370 } 3371 3372 // If we're in a record, we want to hide the target, so we 3373 // return true (without a diagnostic) to tell the caller not to 3374 // build a shadow decl. 3375 if (CurContext->isRecord()) 3376 return true; 3377 3378 // If we're not in a record, this is an error. 3379 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3380 break; 3381 } 3382 3383 Diag(Target->getLocation(), diag::note_using_decl_target); 3384 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3385 return true; 3386 } 3387 3388 // Target is not a function. 3389 3390 if (isa<TagDecl>(Target)) { 3391 // No conflict between a tag and a non-tag. 3392 if (!Tag) return false; 3393 3394 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3395 Diag(Target->getLocation(), diag::note_using_decl_target); 3396 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3397 return true; 3398 } 3399 3400 // No conflict between a tag and a non-tag. 3401 if (!NonTag) return false; 3402 3403 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3404 Diag(Target->getLocation(), diag::note_using_decl_target); 3405 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3406 return true; 3407} 3408 3409/// Builds a shadow declaration corresponding to a 'using' declaration. 3410UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3411 UsingDecl *UD, 3412 NamedDecl *Orig) { 3413 3414 // If we resolved to another shadow declaration, just coalesce them. 3415 NamedDecl *Target = Orig; 3416 if (isa<UsingShadowDecl>(Target)) { 3417 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3418 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3419 } 3420 3421 UsingShadowDecl *Shadow 3422 = UsingShadowDecl::Create(Context, CurContext, 3423 UD->getLocation(), UD, Target); 3424 UD->addShadowDecl(Shadow); 3425 3426 if (S) 3427 PushOnScopeChains(Shadow, S); 3428 else 3429 CurContext->addDecl(Shadow); 3430 Shadow->setAccess(UD->getAccess()); 3431 3432 // Register it as a conversion if appropriate. 3433 if (Shadow->getDeclName().getNameKind() 3434 == DeclarationName::CXXConversionFunctionName) 3435 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3436 3437 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3438 Shadow->setInvalidDecl(); 3439 3440 return Shadow; 3441} 3442 3443/// Hides a using shadow declaration. This is required by the current 3444/// using-decl implementation when a resolvable using declaration in a 3445/// class is followed by a declaration which would hide or override 3446/// one or more of the using decl's targets; for example: 3447/// 3448/// struct Base { void foo(int); }; 3449/// struct Derived : Base { 3450/// using Base::foo; 3451/// void foo(int); 3452/// }; 3453/// 3454/// The governing language is C++03 [namespace.udecl]p12: 3455/// 3456/// When a using-declaration brings names from a base class into a 3457/// derived class scope, member functions in the derived class 3458/// override and/or hide member functions with the same name and 3459/// parameter types in a base class (rather than conflicting). 3460/// 3461/// There are two ways to implement this: 3462/// (1) optimistically create shadow decls when they're not hidden 3463/// by existing declarations, or 3464/// (2) don't create any shadow decls (or at least don't make them 3465/// visible) until we've fully parsed/instantiated the class. 3466/// The problem with (1) is that we might have to retroactively remove 3467/// a shadow decl, which requires several O(n) operations because the 3468/// decl structures are (very reasonably) not designed for removal. 3469/// (2) avoids this but is very fiddly and phase-dependent. 3470void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3471 if (Shadow->getDeclName().getNameKind() == 3472 DeclarationName::CXXConversionFunctionName) 3473 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3474 3475 // Remove it from the DeclContext... 3476 Shadow->getDeclContext()->removeDecl(Shadow); 3477 3478 // ...and the scope, if applicable... 3479 if (S) { 3480 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3481 IdResolver.RemoveDecl(Shadow); 3482 } 3483 3484 // ...and the using decl. 3485 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3486 3487 // TODO: complain somehow if Shadow was used. It shouldn't 3488 // be possible for this to happen, because...? 3489} 3490 3491/// Builds a using declaration. 3492/// 3493/// \param IsInstantiation - Whether this call arises from an 3494/// instantiation of an unresolved using declaration. We treat 3495/// the lookup differently for these declarations. 3496NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3497 SourceLocation UsingLoc, 3498 CXXScopeSpec &SS, 3499 SourceLocation IdentLoc, 3500 DeclarationName Name, 3501 AttributeList *AttrList, 3502 bool IsInstantiation, 3503 bool IsTypeName, 3504 SourceLocation TypenameLoc) { 3505 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3506 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3507 3508 // FIXME: We ignore attributes for now. 3509 delete AttrList; 3510 3511 if (SS.isEmpty()) { 3512 Diag(IdentLoc, diag::err_using_requires_qualname); 3513 return 0; 3514 } 3515 3516 // Do the redeclaration lookup in the current scope. 3517 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3518 ForRedeclaration); 3519 Previous.setHideTags(false); 3520 if (S) { 3521 LookupName(Previous, S); 3522 3523 // It is really dumb that we have to do this. 3524 LookupResult::Filter F = Previous.makeFilter(); 3525 while (F.hasNext()) { 3526 NamedDecl *D = F.next(); 3527 if (!isDeclInScope(D, CurContext, S)) 3528 F.erase(); 3529 } 3530 F.done(); 3531 } else { 3532 assert(IsInstantiation && "no scope in non-instantiation"); 3533 assert(CurContext->isRecord() && "scope not record in instantiation"); 3534 LookupQualifiedName(Previous, CurContext); 3535 } 3536 3537 NestedNameSpecifier *NNS = 3538 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3539 3540 // Check for invalid redeclarations. 3541 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3542 return 0; 3543 3544 // Check for bad qualifiers. 3545 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3546 return 0; 3547 3548 DeclContext *LookupContext = computeDeclContext(SS); 3549 NamedDecl *D; 3550 if (!LookupContext) { 3551 if (IsTypeName) { 3552 // FIXME: not all declaration name kinds are legal here 3553 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3554 UsingLoc, TypenameLoc, 3555 SS.getRange(), NNS, 3556 IdentLoc, Name); 3557 } else { 3558 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3559 UsingLoc, SS.getRange(), NNS, 3560 IdentLoc, Name); 3561 } 3562 } else { 3563 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3564 SS.getRange(), UsingLoc, NNS, Name, 3565 IsTypeName); 3566 } 3567 D->setAccess(AS); 3568 CurContext->addDecl(D); 3569 3570 if (!LookupContext) return D; 3571 UsingDecl *UD = cast<UsingDecl>(D); 3572 3573 if (RequireCompleteDeclContext(SS)) { 3574 UD->setInvalidDecl(); 3575 return UD; 3576 } 3577 3578 // Look up the target name. 3579 3580 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3581 3582 // Unlike most lookups, we don't always want to hide tag 3583 // declarations: tag names are visible through the using declaration 3584 // even if hidden by ordinary names, *except* in a dependent context 3585 // where it's important for the sanity of two-phase lookup. 3586 if (!IsInstantiation) 3587 R.setHideTags(false); 3588 3589 LookupQualifiedName(R, LookupContext); 3590 3591 if (R.empty()) { 3592 Diag(IdentLoc, diag::err_no_member) 3593 << Name << LookupContext << SS.getRange(); 3594 UD->setInvalidDecl(); 3595 return UD; 3596 } 3597 3598 if (R.isAmbiguous()) { 3599 UD->setInvalidDecl(); 3600 return UD; 3601 } 3602 3603 if (IsTypeName) { 3604 // If we asked for a typename and got a non-type decl, error out. 3605 if (!R.getAsSingle<TypeDecl>()) { 3606 Diag(IdentLoc, diag::err_using_typename_non_type); 3607 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3608 Diag((*I)->getUnderlyingDecl()->getLocation(), 3609 diag::note_using_decl_target); 3610 UD->setInvalidDecl(); 3611 return UD; 3612 } 3613 } else { 3614 // If we asked for a non-typename and we got a type, error out, 3615 // but only if this is an instantiation of an unresolved using 3616 // decl. Otherwise just silently find the type name. 3617 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3618 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3619 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3620 UD->setInvalidDecl(); 3621 return UD; 3622 } 3623 } 3624 3625 // C++0x N2914 [namespace.udecl]p6: 3626 // A using-declaration shall not name a namespace. 3627 if (R.getAsSingle<NamespaceDecl>()) { 3628 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3629 << SS.getRange(); 3630 UD->setInvalidDecl(); 3631 return UD; 3632 } 3633 3634 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3635 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3636 BuildUsingShadowDecl(S, UD, *I); 3637 } 3638 3639 return UD; 3640} 3641 3642/// Checks that the given using declaration is not an invalid 3643/// redeclaration. Note that this is checking only for the using decl 3644/// itself, not for any ill-formedness among the UsingShadowDecls. 3645bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3646 bool isTypeName, 3647 const CXXScopeSpec &SS, 3648 SourceLocation NameLoc, 3649 const LookupResult &Prev) { 3650 // C++03 [namespace.udecl]p8: 3651 // C++0x [namespace.udecl]p10: 3652 // A using-declaration is a declaration and can therefore be used 3653 // repeatedly where (and only where) multiple declarations are 3654 // allowed. 3655 // That's only in file contexts. 3656 if (CurContext->getLookupContext()->isFileContext()) 3657 return false; 3658 3659 NestedNameSpecifier *Qual 3660 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3661 3662 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3663 NamedDecl *D = *I; 3664 3665 bool DTypename; 3666 NestedNameSpecifier *DQual; 3667 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3668 DTypename = UD->isTypeName(); 3669 DQual = UD->getTargetNestedNameDecl(); 3670 } else if (UnresolvedUsingValueDecl *UD 3671 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3672 DTypename = false; 3673 DQual = UD->getTargetNestedNameSpecifier(); 3674 } else if (UnresolvedUsingTypenameDecl *UD 3675 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3676 DTypename = true; 3677 DQual = UD->getTargetNestedNameSpecifier(); 3678 } else continue; 3679 3680 // using decls differ if one says 'typename' and the other doesn't. 3681 // FIXME: non-dependent using decls? 3682 if (isTypeName != DTypename) continue; 3683 3684 // using decls differ if they name different scopes (but note that 3685 // template instantiation can cause this check to trigger when it 3686 // didn't before instantiation). 3687 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3688 Context.getCanonicalNestedNameSpecifier(DQual)) 3689 continue; 3690 3691 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3692 Diag(D->getLocation(), diag::note_using_decl) << 1; 3693 return true; 3694 } 3695 3696 return false; 3697} 3698 3699 3700/// Checks that the given nested-name qualifier used in a using decl 3701/// in the current context is appropriately related to the current 3702/// scope. If an error is found, diagnoses it and returns true. 3703bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3704 const CXXScopeSpec &SS, 3705 SourceLocation NameLoc) { 3706 DeclContext *NamedContext = computeDeclContext(SS); 3707 3708 if (!CurContext->isRecord()) { 3709 // C++03 [namespace.udecl]p3: 3710 // C++0x [namespace.udecl]p8: 3711 // A using-declaration for a class member shall be a member-declaration. 3712 3713 // If we weren't able to compute a valid scope, it must be a 3714 // dependent class scope. 3715 if (!NamedContext || NamedContext->isRecord()) { 3716 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3717 << SS.getRange(); 3718 return true; 3719 } 3720 3721 // Otherwise, everything is known to be fine. 3722 return false; 3723 } 3724 3725 // The current scope is a record. 3726 3727 // If the named context is dependent, we can't decide much. 3728 if (!NamedContext) { 3729 // FIXME: in C++0x, we can diagnose if we can prove that the 3730 // nested-name-specifier does not refer to a base class, which is 3731 // still possible in some cases. 3732 3733 // Otherwise we have to conservatively report that things might be 3734 // okay. 3735 return false; 3736 } 3737 3738 if (!NamedContext->isRecord()) { 3739 // Ideally this would point at the last name in the specifier, 3740 // but we don't have that level of source info. 3741 Diag(SS.getRange().getBegin(), 3742 diag::err_using_decl_nested_name_specifier_is_not_class) 3743 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3744 return true; 3745 } 3746 3747 if (getLangOptions().CPlusPlus0x) { 3748 // C++0x [namespace.udecl]p3: 3749 // In a using-declaration used as a member-declaration, the 3750 // nested-name-specifier shall name a base class of the class 3751 // being defined. 3752 3753 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3754 cast<CXXRecordDecl>(NamedContext))) { 3755 if (CurContext == NamedContext) { 3756 Diag(NameLoc, 3757 diag::err_using_decl_nested_name_specifier_is_current_class) 3758 << SS.getRange(); 3759 return true; 3760 } 3761 3762 Diag(SS.getRange().getBegin(), 3763 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3764 << (NestedNameSpecifier*) SS.getScopeRep() 3765 << cast<CXXRecordDecl>(CurContext) 3766 << SS.getRange(); 3767 return true; 3768 } 3769 3770 return false; 3771 } 3772 3773 // C++03 [namespace.udecl]p4: 3774 // A using-declaration used as a member-declaration shall refer 3775 // to a member of a base class of the class being defined [etc.]. 3776 3777 // Salient point: SS doesn't have to name a base class as long as 3778 // lookup only finds members from base classes. Therefore we can 3779 // diagnose here only if we can prove that that can't happen, 3780 // i.e. if the class hierarchies provably don't intersect. 3781 3782 // TODO: it would be nice if "definitely valid" results were cached 3783 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3784 // need to be repeated. 3785 3786 struct UserData { 3787 llvm::DenseSet<const CXXRecordDecl*> Bases; 3788 3789 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3790 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3791 Data->Bases.insert(Base); 3792 return true; 3793 } 3794 3795 bool hasDependentBases(const CXXRecordDecl *Class) { 3796 return !Class->forallBases(collect, this); 3797 } 3798 3799 /// Returns true if the base is dependent or is one of the 3800 /// accumulated base classes. 3801 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3802 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3803 return !Data->Bases.count(Base); 3804 } 3805 3806 bool mightShareBases(const CXXRecordDecl *Class) { 3807 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3808 } 3809 }; 3810 3811 UserData Data; 3812 3813 // Returns false if we find a dependent base. 3814 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3815 return false; 3816 3817 // Returns false if the class has a dependent base or if it or one 3818 // of its bases is present in the base set of the current context. 3819 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3820 return false; 3821 3822 Diag(SS.getRange().getBegin(), 3823 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3824 << (NestedNameSpecifier*) SS.getScopeRep() 3825 << cast<CXXRecordDecl>(CurContext) 3826 << SS.getRange(); 3827 3828 return true; 3829} 3830 3831Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3832 SourceLocation NamespaceLoc, 3833 SourceLocation AliasLoc, 3834 IdentifierInfo *Alias, 3835 CXXScopeSpec &SS, 3836 SourceLocation IdentLoc, 3837 IdentifierInfo *Ident) { 3838 3839 // Lookup the namespace name. 3840 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3841 LookupParsedName(R, S, &SS); 3842 3843 // Check if we have a previous declaration with the same name. 3844 if (NamedDecl *PrevDecl 3845 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 3846 ForRedeclaration)) { 3847 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3848 // We already have an alias with the same name that points to the same 3849 // namespace, so don't create a new one. 3850 // FIXME: At some point, we'll want to create the (redundant) 3851 // declaration to maintain better source information. 3852 if (!R.isAmbiguous() && !R.empty() && 3853 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3854 return DeclPtrTy(); 3855 } 3856 3857 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3858 diag::err_redefinition_different_kind; 3859 Diag(AliasLoc, DiagID) << Alias; 3860 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3861 return DeclPtrTy(); 3862 } 3863 3864 if (R.isAmbiguous()) 3865 return DeclPtrTy(); 3866 3867 if (R.empty()) { 3868 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3869 return DeclPtrTy(); 3870 } 3871 3872 NamespaceAliasDecl *AliasDecl = 3873 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3874 Alias, SS.getRange(), 3875 (NestedNameSpecifier *)SS.getScopeRep(), 3876 IdentLoc, R.getFoundDecl()); 3877 3878 PushOnScopeChains(AliasDecl, S); 3879 return DeclPtrTy::make(AliasDecl); 3880} 3881 3882void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3883 CXXConstructorDecl *Constructor) { 3884 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3885 !Constructor->isUsed()) && 3886 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3887 3888 CXXRecordDecl *ClassDecl 3889 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3890 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3891 3892 DeclContext *PreviousContext = CurContext; 3893 CurContext = Constructor; 3894 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3895 Diag(CurrentLocation, diag::note_member_synthesized_at) 3896 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3897 Constructor->setInvalidDecl(); 3898 } else { 3899 Constructor->setUsed(); 3900 } 3901 CurContext = PreviousContext; 3902} 3903 3904void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3905 CXXDestructorDecl *Destructor) { 3906 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3907 "DefineImplicitDestructor - call it for implicit default dtor"); 3908 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3909 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3910 3911 DeclContext *PreviousContext = CurContext; 3912 CurContext = Destructor; 3913 3914 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3915 Destructor->getParent()); 3916 3917 // FIXME: If CheckDestructor fails, we should emit a note about where the 3918 // implicit destructor was needed. 3919 if (CheckDestructor(Destructor)) { 3920 Diag(CurrentLocation, diag::note_member_synthesized_at) 3921 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3922 3923 Destructor->setInvalidDecl(); 3924 CurContext = PreviousContext; 3925 3926 return; 3927 } 3928 CurContext = PreviousContext; 3929 3930 Destructor->setUsed(); 3931} 3932 3933void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3934 CXXMethodDecl *MethodDecl) { 3935 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3936 MethodDecl->getOverloadedOperator() == OO_Equal && 3937 !MethodDecl->isUsed()) && 3938 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3939 3940 CXXRecordDecl *ClassDecl 3941 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3942 3943 DeclContext *PreviousContext = CurContext; 3944 CurContext = MethodDecl; 3945 3946 // C++[class.copy] p12 3947 // Before the implicitly-declared copy assignment operator for a class is 3948 // implicitly defined, all implicitly-declared copy assignment operators 3949 // for its direct base classes and its nonstatic data members shall have 3950 // been implicitly defined. 3951 bool err = false; 3952 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3953 E = ClassDecl->bases_end(); Base != E; ++Base) { 3954 CXXRecordDecl *BaseClassDecl 3955 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3956 if (CXXMethodDecl *BaseAssignOpMethod = 3957 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3958 BaseClassDecl)) { 3959 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3960 BaseAssignOpMethod, 3961 PDiag(diag::err_access_assign_base) 3962 << Base->getType()); 3963 3964 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3965 } 3966 } 3967 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3968 E = ClassDecl->field_end(); Field != E; ++Field) { 3969 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3970 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3971 FieldType = Array->getElementType(); 3972 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3973 CXXRecordDecl *FieldClassDecl 3974 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3975 if (CXXMethodDecl *FieldAssignOpMethod = 3976 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3977 FieldClassDecl)) { 3978 CheckDirectMemberAccess(Field->getLocation(), 3979 FieldAssignOpMethod, 3980 PDiag(diag::err_access_assign_field) 3981 << Field->getDeclName() << Field->getType()); 3982 3983 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3984 } 3985 } else if (FieldType->isReferenceType()) { 3986 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3987 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3988 Diag(Field->getLocation(), diag::note_declared_at); 3989 Diag(CurrentLocation, diag::note_first_required_here); 3990 err = true; 3991 } else if (FieldType.isConstQualified()) { 3992 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3993 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3994 Diag(Field->getLocation(), diag::note_declared_at); 3995 Diag(CurrentLocation, diag::note_first_required_here); 3996 err = true; 3997 } 3998 } 3999 if (!err) 4000 MethodDecl->setUsed(); 4001 4002 CurContext = PreviousContext; 4003} 4004 4005CXXMethodDecl * 4006Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 4007 ParmVarDecl *ParmDecl, 4008 CXXRecordDecl *ClassDecl) { 4009 QualType LHSType = Context.getTypeDeclType(ClassDecl); 4010 QualType RHSType(LHSType); 4011 // If class's assignment operator argument is const/volatile qualified, 4012 // look for operator = (const/volatile B&). Otherwise, look for 4013 // operator = (B&). 4014 RHSType = Context.getCVRQualifiedType(RHSType, 4015 ParmDecl->getType().getCVRQualifiers()); 4016 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 4017 LHSType, 4018 SourceLocation())); 4019 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 4020 RHSType, 4021 CurrentLocation)); 4022 Expr *Args[2] = { &*LHS, &*RHS }; 4023 OverloadCandidateSet CandidateSet(CurrentLocation); 4024 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 4025 CandidateSet); 4026 OverloadCandidateSet::iterator Best; 4027 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 4028 return cast<CXXMethodDecl>(Best->Function); 4029 assert(false && 4030 "getAssignOperatorMethod - copy assignment operator method not found"); 4031 return 0; 4032} 4033 4034void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4035 CXXConstructorDecl *CopyConstructor, 4036 unsigned TypeQuals) { 4037 assert((CopyConstructor->isImplicit() && 4038 CopyConstructor->isCopyConstructor(TypeQuals) && 4039 !CopyConstructor->isUsed()) && 4040 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4041 4042 CXXRecordDecl *ClassDecl 4043 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 4044 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4045 4046 DeclContext *PreviousContext = CurContext; 4047 CurContext = CopyConstructor; 4048 4049 // C++ [class.copy] p209 4050 // Before the implicitly-declared copy constructor for a class is 4051 // implicitly defined, all the implicitly-declared copy constructors 4052 // for its base class and its non-static data members shall have been 4053 // implicitly defined. 4054 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 4055 Base != ClassDecl->bases_end(); ++Base) { 4056 CXXRecordDecl *BaseClassDecl 4057 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4058 if (CXXConstructorDecl *BaseCopyCtor = 4059 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4060 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4061 BaseCopyCtor, 4062 PDiag(diag::err_access_copy_base) 4063 << Base->getType()); 4064 4065 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4066 } 4067 } 4068 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4069 FieldEnd = ClassDecl->field_end(); 4070 Field != FieldEnd; ++Field) { 4071 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4072 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4073 FieldType = Array->getElementType(); 4074 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4075 CXXRecordDecl *FieldClassDecl 4076 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4077 if (CXXConstructorDecl *FieldCopyCtor = 4078 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4079 CheckDirectMemberAccess(Field->getLocation(), 4080 FieldCopyCtor, 4081 PDiag(diag::err_access_copy_field) 4082 << Field->getDeclName() << Field->getType()); 4083 4084 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4085 } 4086 } 4087 } 4088 CopyConstructor->setUsed(); 4089 4090 CurContext = PreviousContext; 4091} 4092 4093Sema::OwningExprResult 4094Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4095 CXXConstructorDecl *Constructor, 4096 MultiExprArg ExprArgs, 4097 bool RequiresZeroInit, 4098 bool BaseInitialization) { 4099 bool Elidable = false; 4100 4101 // C++0x [class.copy]p34: 4102 // When certain criteria are met, an implementation is allowed to 4103 // omit the copy/move construction of a class object, even if the 4104 // copy/move constructor and/or destructor for the object have 4105 // side effects. [...] 4106 // - when a temporary class object that has not been bound to a 4107 // reference (12.2) would be copied/moved to a class object 4108 // with the same cv-unqualified type, the copy/move operation 4109 // can be omitted by constructing the temporary object 4110 // directly into the target of the omitted copy/move 4111 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4112 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4113 Elidable = SubExpr->isTemporaryObject() && 4114 Context.hasSameUnqualifiedType(SubExpr->getType(), 4115 Context.getTypeDeclType(Constructor->getParent())); 4116 } 4117 4118 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4119 Elidable, move(ExprArgs), RequiresZeroInit, 4120 BaseInitialization); 4121} 4122 4123/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4124/// including handling of its default argument expressions. 4125Sema::OwningExprResult 4126Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4127 CXXConstructorDecl *Constructor, bool Elidable, 4128 MultiExprArg ExprArgs, 4129 bool RequiresZeroInit, 4130 bool BaseInitialization) { 4131 unsigned NumExprs = ExprArgs.size(); 4132 Expr **Exprs = (Expr **)ExprArgs.release(); 4133 4134 MarkDeclarationReferenced(ConstructLoc, Constructor); 4135 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4136 Constructor, Elidable, Exprs, NumExprs, 4137 RequiresZeroInit, BaseInitialization)); 4138} 4139 4140bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4141 CXXConstructorDecl *Constructor, 4142 MultiExprArg Exprs) { 4143 OwningExprResult TempResult = 4144 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4145 move(Exprs)); 4146 if (TempResult.isInvalid()) 4147 return true; 4148 4149 Expr *Temp = TempResult.takeAs<Expr>(); 4150 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4151 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4152 VD->setInit(Temp); 4153 4154 return false; 4155} 4156 4157void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4158 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4159 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4160 !ClassDecl->hasTrivialDestructor()) { 4161 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4162 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4163 CheckDestructorAccess(VD->getLocation(), Destructor, 4164 PDiag(diag::err_access_dtor_var) 4165 << VD->getDeclName() 4166 << VD->getType()); 4167 } 4168} 4169 4170/// AddCXXDirectInitializerToDecl - This action is called immediately after 4171/// ActOnDeclarator, when a C++ direct initializer is present. 4172/// e.g: "int x(1);" 4173void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4174 SourceLocation LParenLoc, 4175 MultiExprArg Exprs, 4176 SourceLocation *CommaLocs, 4177 SourceLocation RParenLoc) { 4178 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4179 Decl *RealDecl = Dcl.getAs<Decl>(); 4180 4181 // If there is no declaration, there was an error parsing it. Just ignore 4182 // the initializer. 4183 if (RealDecl == 0) 4184 return; 4185 4186 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4187 if (!VDecl) { 4188 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4189 RealDecl->setInvalidDecl(); 4190 return; 4191 } 4192 4193 // We will represent direct-initialization similarly to copy-initialization: 4194 // int x(1); -as-> int x = 1; 4195 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4196 // 4197 // Clients that want to distinguish between the two forms, can check for 4198 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4199 // A major benefit is that clients that don't particularly care about which 4200 // exactly form was it (like the CodeGen) can handle both cases without 4201 // special case code. 4202 4203 // C++ 8.5p11: 4204 // The form of initialization (using parentheses or '=') is generally 4205 // insignificant, but does matter when the entity being initialized has a 4206 // class type. 4207 QualType DeclInitType = VDecl->getType(); 4208 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4209 DeclInitType = Context.getBaseElementType(Array); 4210 4211 if (!VDecl->getType()->isDependentType() && 4212 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4213 diag::err_typecheck_decl_incomplete_type)) { 4214 VDecl->setInvalidDecl(); 4215 return; 4216 } 4217 4218 // The variable can not have an abstract class type. 4219 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4220 diag::err_abstract_type_in_decl, 4221 AbstractVariableType)) 4222 VDecl->setInvalidDecl(); 4223 4224 const VarDecl *Def; 4225 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4226 Diag(VDecl->getLocation(), diag::err_redefinition) 4227 << VDecl->getDeclName(); 4228 Diag(Def->getLocation(), diag::note_previous_definition); 4229 VDecl->setInvalidDecl(); 4230 return; 4231 } 4232 4233 // If either the declaration has a dependent type or if any of the 4234 // expressions is type-dependent, we represent the initialization 4235 // via a ParenListExpr for later use during template instantiation. 4236 if (VDecl->getType()->isDependentType() || 4237 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4238 // Let clients know that initialization was done with a direct initializer. 4239 VDecl->setCXXDirectInitializer(true); 4240 4241 // Store the initialization expressions as a ParenListExpr. 4242 unsigned NumExprs = Exprs.size(); 4243 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4244 (Expr **)Exprs.release(), 4245 NumExprs, RParenLoc)); 4246 return; 4247 } 4248 4249 // Capture the variable that is being initialized and the style of 4250 // initialization. 4251 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4252 4253 // FIXME: Poor source location information. 4254 InitializationKind Kind 4255 = InitializationKind::CreateDirect(VDecl->getLocation(), 4256 LParenLoc, RParenLoc); 4257 4258 InitializationSequence InitSeq(*this, Entity, Kind, 4259 (Expr**)Exprs.get(), Exprs.size()); 4260 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4261 if (Result.isInvalid()) { 4262 VDecl->setInvalidDecl(); 4263 return; 4264 } 4265 4266 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4267 VDecl->setInit(Result.takeAs<Expr>()); 4268 VDecl->setCXXDirectInitializer(true); 4269 4270 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4271 FinalizeVarWithDestructor(VDecl, Record); 4272} 4273 4274/// \brief Given a constructor and the set of arguments provided for the 4275/// constructor, convert the arguments and add any required default arguments 4276/// to form a proper call to this constructor. 4277/// 4278/// \returns true if an error occurred, false otherwise. 4279bool 4280Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4281 MultiExprArg ArgsPtr, 4282 SourceLocation Loc, 4283 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4284 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4285 unsigned NumArgs = ArgsPtr.size(); 4286 Expr **Args = (Expr **)ArgsPtr.get(); 4287 4288 const FunctionProtoType *Proto 4289 = Constructor->getType()->getAs<FunctionProtoType>(); 4290 assert(Proto && "Constructor without a prototype?"); 4291 unsigned NumArgsInProto = Proto->getNumArgs(); 4292 4293 // If too few arguments are available, we'll fill in the rest with defaults. 4294 if (NumArgs < NumArgsInProto) 4295 ConvertedArgs.reserve(NumArgsInProto); 4296 else 4297 ConvertedArgs.reserve(NumArgs); 4298 4299 VariadicCallType CallType = 4300 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4301 llvm::SmallVector<Expr *, 8> AllArgs; 4302 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4303 Proto, 0, Args, NumArgs, AllArgs, 4304 CallType); 4305 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4306 ConvertedArgs.push_back(AllArgs[i]); 4307 return Invalid; 4308} 4309 4310static inline bool 4311CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4312 const FunctionDecl *FnDecl) { 4313 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4314 if (isa<NamespaceDecl>(DC)) { 4315 return SemaRef.Diag(FnDecl->getLocation(), 4316 diag::err_operator_new_delete_declared_in_namespace) 4317 << FnDecl->getDeclName(); 4318 } 4319 4320 if (isa<TranslationUnitDecl>(DC) && 4321 FnDecl->getStorageClass() == FunctionDecl::Static) { 4322 return SemaRef.Diag(FnDecl->getLocation(), 4323 diag::err_operator_new_delete_declared_static) 4324 << FnDecl->getDeclName(); 4325 } 4326 4327 return false; 4328} 4329 4330static inline bool 4331CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4332 CanQualType ExpectedResultType, 4333 CanQualType ExpectedFirstParamType, 4334 unsigned DependentParamTypeDiag, 4335 unsigned InvalidParamTypeDiag) { 4336 QualType ResultType = 4337 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4338 4339 // Check that the result type is not dependent. 4340 if (ResultType->isDependentType()) 4341 return SemaRef.Diag(FnDecl->getLocation(), 4342 diag::err_operator_new_delete_dependent_result_type) 4343 << FnDecl->getDeclName() << ExpectedResultType; 4344 4345 // Check that the result type is what we expect. 4346 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4347 return SemaRef.Diag(FnDecl->getLocation(), 4348 diag::err_operator_new_delete_invalid_result_type) 4349 << FnDecl->getDeclName() << ExpectedResultType; 4350 4351 // A function template must have at least 2 parameters. 4352 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4353 return SemaRef.Diag(FnDecl->getLocation(), 4354 diag::err_operator_new_delete_template_too_few_parameters) 4355 << FnDecl->getDeclName(); 4356 4357 // The function decl must have at least 1 parameter. 4358 if (FnDecl->getNumParams() == 0) 4359 return SemaRef.Diag(FnDecl->getLocation(), 4360 diag::err_operator_new_delete_too_few_parameters) 4361 << FnDecl->getDeclName(); 4362 4363 // Check the the first parameter type is not dependent. 4364 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4365 if (FirstParamType->isDependentType()) 4366 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4367 << FnDecl->getDeclName() << ExpectedFirstParamType; 4368 4369 // Check that the first parameter type is what we expect. 4370 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4371 ExpectedFirstParamType) 4372 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4373 << FnDecl->getDeclName() << ExpectedFirstParamType; 4374 4375 return false; 4376} 4377 4378static bool 4379CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4380 // C++ [basic.stc.dynamic.allocation]p1: 4381 // A program is ill-formed if an allocation function is declared in a 4382 // namespace scope other than global scope or declared static in global 4383 // scope. 4384 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4385 return true; 4386 4387 CanQualType SizeTy = 4388 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4389 4390 // C++ [basic.stc.dynamic.allocation]p1: 4391 // The return type shall be void*. The first parameter shall have type 4392 // std::size_t. 4393 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4394 SizeTy, 4395 diag::err_operator_new_dependent_param_type, 4396 diag::err_operator_new_param_type)) 4397 return true; 4398 4399 // C++ [basic.stc.dynamic.allocation]p1: 4400 // The first parameter shall not have an associated default argument. 4401 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4402 return SemaRef.Diag(FnDecl->getLocation(), 4403 diag::err_operator_new_default_arg) 4404 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4405 4406 return false; 4407} 4408 4409static bool 4410CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4411 // C++ [basic.stc.dynamic.deallocation]p1: 4412 // A program is ill-formed if deallocation functions are declared in a 4413 // namespace scope other than global scope or declared static in global 4414 // scope. 4415 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4416 return true; 4417 4418 // C++ [basic.stc.dynamic.deallocation]p2: 4419 // Each deallocation function shall return void and its first parameter 4420 // shall be void*. 4421 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4422 SemaRef.Context.VoidPtrTy, 4423 diag::err_operator_delete_dependent_param_type, 4424 diag::err_operator_delete_param_type)) 4425 return true; 4426 4427 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4428 if (FirstParamType->isDependentType()) 4429 return SemaRef.Diag(FnDecl->getLocation(), 4430 diag::err_operator_delete_dependent_param_type) 4431 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4432 4433 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4434 SemaRef.Context.VoidPtrTy) 4435 return SemaRef.Diag(FnDecl->getLocation(), 4436 diag::err_operator_delete_param_type) 4437 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4438 4439 return false; 4440} 4441 4442/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4443/// of this overloaded operator is well-formed. If so, returns false; 4444/// otherwise, emits appropriate diagnostics and returns true. 4445bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4446 assert(FnDecl && FnDecl->isOverloadedOperator() && 4447 "Expected an overloaded operator declaration"); 4448 4449 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4450 4451 // C++ [over.oper]p5: 4452 // The allocation and deallocation functions, operator new, 4453 // operator new[], operator delete and operator delete[], are 4454 // described completely in 3.7.3. The attributes and restrictions 4455 // found in the rest of this subclause do not apply to them unless 4456 // explicitly stated in 3.7.3. 4457 if (Op == OO_Delete || Op == OO_Array_Delete) 4458 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4459 4460 if (Op == OO_New || Op == OO_Array_New) 4461 return CheckOperatorNewDeclaration(*this, FnDecl); 4462 4463 // C++ [over.oper]p6: 4464 // An operator function shall either be a non-static member 4465 // function or be a non-member function and have at least one 4466 // parameter whose type is a class, a reference to a class, an 4467 // enumeration, or a reference to an enumeration. 4468 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4469 if (MethodDecl->isStatic()) 4470 return Diag(FnDecl->getLocation(), 4471 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4472 } else { 4473 bool ClassOrEnumParam = false; 4474 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4475 ParamEnd = FnDecl->param_end(); 4476 Param != ParamEnd; ++Param) { 4477 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4478 if (ParamType->isDependentType() || ParamType->isRecordType() || 4479 ParamType->isEnumeralType()) { 4480 ClassOrEnumParam = true; 4481 break; 4482 } 4483 } 4484 4485 if (!ClassOrEnumParam) 4486 return Diag(FnDecl->getLocation(), 4487 diag::err_operator_overload_needs_class_or_enum) 4488 << FnDecl->getDeclName(); 4489 } 4490 4491 // C++ [over.oper]p8: 4492 // An operator function cannot have default arguments (8.3.6), 4493 // except where explicitly stated below. 4494 // 4495 // Only the function-call operator allows default arguments 4496 // (C++ [over.call]p1). 4497 if (Op != OO_Call) { 4498 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4499 Param != FnDecl->param_end(); ++Param) { 4500 if ((*Param)->hasDefaultArg()) 4501 return Diag((*Param)->getLocation(), 4502 diag::err_operator_overload_default_arg) 4503 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4504 } 4505 } 4506 4507 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4508 { false, false, false } 4509#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4510 , { Unary, Binary, MemberOnly } 4511#include "clang/Basic/OperatorKinds.def" 4512 }; 4513 4514 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4515 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4516 bool MustBeMemberOperator = OperatorUses[Op][2]; 4517 4518 // C++ [over.oper]p8: 4519 // [...] Operator functions cannot have more or fewer parameters 4520 // than the number required for the corresponding operator, as 4521 // described in the rest of this subclause. 4522 unsigned NumParams = FnDecl->getNumParams() 4523 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4524 if (Op != OO_Call && 4525 ((NumParams == 1 && !CanBeUnaryOperator) || 4526 (NumParams == 2 && !CanBeBinaryOperator) || 4527 (NumParams < 1) || (NumParams > 2))) { 4528 // We have the wrong number of parameters. 4529 unsigned ErrorKind; 4530 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4531 ErrorKind = 2; // 2 -> unary or binary. 4532 } else if (CanBeUnaryOperator) { 4533 ErrorKind = 0; // 0 -> unary 4534 } else { 4535 assert(CanBeBinaryOperator && 4536 "All non-call overloaded operators are unary or binary!"); 4537 ErrorKind = 1; // 1 -> binary 4538 } 4539 4540 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4541 << FnDecl->getDeclName() << NumParams << ErrorKind; 4542 } 4543 4544 // Overloaded operators other than operator() cannot be variadic. 4545 if (Op != OO_Call && 4546 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4547 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4548 << FnDecl->getDeclName(); 4549 } 4550 4551 // Some operators must be non-static member functions. 4552 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4553 return Diag(FnDecl->getLocation(), 4554 diag::err_operator_overload_must_be_member) 4555 << FnDecl->getDeclName(); 4556 } 4557 4558 // C++ [over.inc]p1: 4559 // The user-defined function called operator++ implements the 4560 // prefix and postfix ++ operator. If this function is a member 4561 // function with no parameters, or a non-member function with one 4562 // parameter of class or enumeration type, it defines the prefix 4563 // increment operator ++ for objects of that type. If the function 4564 // is a member function with one parameter (which shall be of type 4565 // int) or a non-member function with two parameters (the second 4566 // of which shall be of type int), it defines the postfix 4567 // increment operator ++ for objects of that type. 4568 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4569 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4570 bool ParamIsInt = false; 4571 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4572 ParamIsInt = BT->getKind() == BuiltinType::Int; 4573 4574 if (!ParamIsInt) 4575 return Diag(LastParam->getLocation(), 4576 diag::err_operator_overload_post_incdec_must_be_int) 4577 << LastParam->getType() << (Op == OO_MinusMinus); 4578 } 4579 4580 // Notify the class if it got an assignment operator. 4581 if (Op == OO_Equal) { 4582 // Would have returned earlier otherwise. 4583 assert(isa<CXXMethodDecl>(FnDecl) && 4584 "Overloaded = not member, but not filtered."); 4585 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4586 Method->getParent()->addedAssignmentOperator(Context, Method); 4587 } 4588 4589 return false; 4590} 4591 4592/// CheckLiteralOperatorDeclaration - Check whether the declaration 4593/// of this literal operator function is well-formed. If so, returns 4594/// false; otherwise, emits appropriate diagnostics and returns true. 4595bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 4596 DeclContext *DC = FnDecl->getDeclContext(); 4597 Decl::Kind Kind = DC->getDeclKind(); 4598 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 4599 Kind != Decl::LinkageSpec) { 4600 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 4601 << FnDecl->getDeclName(); 4602 return true; 4603 } 4604 4605 bool Valid = false; 4606 4607 // template <char...> type operator "" name() is the only valid template 4608 // signature, and the only valid signature with no parameters. 4609 if (FnDecl->param_size() == 0) { 4610 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 4611 // Must have only one template parameter 4612 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 4613 if (Params->size() == 1) { 4614 NonTypeTemplateParmDecl *PmDecl = 4615 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 4616 4617 // The template parameter must be a char parameter pack. 4618 // FIXME: This test will always fail because non-type parameter packs 4619 // have not been implemented. 4620 if (PmDecl && PmDecl->isTemplateParameterPack() && 4621 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 4622 Valid = true; 4623 } 4624 } 4625 } else { 4626 // Check the first parameter 4627 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4628 4629 QualType T = (*Param)->getType(); 4630 4631 // unsigned long long int, long double, and any character type are allowed 4632 // as the only parameters. 4633 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 4634 Context.hasSameType(T, Context.LongDoubleTy) || 4635 Context.hasSameType(T, Context.CharTy) || 4636 Context.hasSameType(T, Context.WCharTy) || 4637 Context.hasSameType(T, Context.Char16Ty) || 4638 Context.hasSameType(T, Context.Char32Ty)) { 4639 if (++Param == FnDecl->param_end()) 4640 Valid = true; 4641 goto FinishedParams; 4642 } 4643 4644 // Otherwise it must be a pointer to const; let's strip those qualifiers. 4645 const PointerType *PT = T->getAs<PointerType>(); 4646 if (!PT) 4647 goto FinishedParams; 4648 T = PT->getPointeeType(); 4649 if (!T.isConstQualified()) 4650 goto FinishedParams; 4651 T = T.getUnqualifiedType(); 4652 4653 // Move on to the second parameter; 4654 ++Param; 4655 4656 // If there is no second parameter, the first must be a const char * 4657 if (Param == FnDecl->param_end()) { 4658 if (Context.hasSameType(T, Context.CharTy)) 4659 Valid = true; 4660 goto FinishedParams; 4661 } 4662 4663 // const char *, const wchar_t*, const char16_t*, and const char32_t* 4664 // are allowed as the first parameter to a two-parameter function 4665 if (!(Context.hasSameType(T, Context.CharTy) || 4666 Context.hasSameType(T, Context.WCharTy) || 4667 Context.hasSameType(T, Context.Char16Ty) || 4668 Context.hasSameType(T, Context.Char32Ty))) 4669 goto FinishedParams; 4670 4671 // The second and final parameter must be an std::size_t 4672 T = (*Param)->getType().getUnqualifiedType(); 4673 if (Context.hasSameType(T, Context.getSizeType()) && 4674 ++Param == FnDecl->param_end()) 4675 Valid = true; 4676 } 4677 4678 // FIXME: This diagnostic is absolutely terrible. 4679FinishedParams: 4680 if (!Valid) { 4681 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 4682 << FnDecl->getDeclName(); 4683 return true; 4684 } 4685 4686 return false; 4687} 4688 4689/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4690/// linkage specification, including the language and (if present) 4691/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4692/// the location of the language string literal, which is provided 4693/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4694/// the '{' brace. Otherwise, this linkage specification does not 4695/// have any braces. 4696Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4697 SourceLocation ExternLoc, 4698 SourceLocation LangLoc, 4699 const char *Lang, 4700 unsigned StrSize, 4701 SourceLocation LBraceLoc) { 4702 LinkageSpecDecl::LanguageIDs Language; 4703 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4704 Language = LinkageSpecDecl::lang_c; 4705 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4706 Language = LinkageSpecDecl::lang_cxx; 4707 else { 4708 Diag(LangLoc, diag::err_bad_language); 4709 return DeclPtrTy(); 4710 } 4711 4712 // FIXME: Add all the various semantics of linkage specifications 4713 4714 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4715 LangLoc, Language, 4716 LBraceLoc.isValid()); 4717 CurContext->addDecl(D); 4718 PushDeclContext(S, D); 4719 return DeclPtrTy::make(D); 4720} 4721 4722/// ActOnFinishLinkageSpecification - Completely the definition of 4723/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4724/// valid, it's the position of the closing '}' brace in a linkage 4725/// specification that uses braces. 4726Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4727 DeclPtrTy LinkageSpec, 4728 SourceLocation RBraceLoc) { 4729 if (LinkageSpec) 4730 PopDeclContext(); 4731 return LinkageSpec; 4732} 4733 4734/// \brief Perform semantic analysis for the variable declaration that 4735/// occurs within a C++ catch clause, returning the newly-created 4736/// variable. 4737VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4738 TypeSourceInfo *TInfo, 4739 IdentifierInfo *Name, 4740 SourceLocation Loc, 4741 SourceRange Range) { 4742 bool Invalid = false; 4743 4744 // Arrays and functions decay. 4745 if (ExDeclType->isArrayType()) 4746 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4747 else if (ExDeclType->isFunctionType()) 4748 ExDeclType = Context.getPointerType(ExDeclType); 4749 4750 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4751 // The exception-declaration shall not denote a pointer or reference to an 4752 // incomplete type, other than [cv] void*. 4753 // N2844 forbids rvalue references. 4754 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4755 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4756 Invalid = true; 4757 } 4758 4759 // GCC allows catching pointers and references to incomplete types 4760 // as an extension; so do we, but we warn by default. 4761 4762 QualType BaseType = ExDeclType; 4763 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4764 unsigned DK = diag::err_catch_incomplete; 4765 bool IncompleteCatchIsInvalid = true; 4766 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4767 BaseType = Ptr->getPointeeType(); 4768 Mode = 1; 4769 DK = diag::ext_catch_incomplete_ptr; 4770 IncompleteCatchIsInvalid = false; 4771 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4772 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4773 BaseType = Ref->getPointeeType(); 4774 Mode = 2; 4775 DK = diag::ext_catch_incomplete_ref; 4776 IncompleteCatchIsInvalid = false; 4777 } 4778 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4779 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 4780 IncompleteCatchIsInvalid) 4781 Invalid = true; 4782 4783 if (!Invalid && !ExDeclType->isDependentType() && 4784 RequireNonAbstractType(Loc, ExDeclType, 4785 diag::err_abstract_type_in_decl, 4786 AbstractVariableType)) 4787 Invalid = true; 4788 4789 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4790 Name, ExDeclType, TInfo, VarDecl::None); 4791 4792 if (!Invalid) { 4793 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 4794 // C++ [except.handle]p16: 4795 // The object declared in an exception-declaration or, if the 4796 // exception-declaration does not specify a name, a temporary (12.2) is 4797 // copy-initialized (8.5) from the exception object. [...] 4798 // The object is destroyed when the handler exits, after the destruction 4799 // of any automatic objects initialized within the handler. 4800 // 4801 // We just pretend to initialize the object with itself, then make sure 4802 // it can be destroyed later. 4803 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 4804 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 4805 Loc, ExDeclType, 0); 4806 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 4807 SourceLocation()); 4808 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 4809 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4810 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 4811 if (Result.isInvalid()) 4812 Invalid = true; 4813 else 4814 FinalizeVarWithDestructor(ExDecl, RecordTy); 4815 } 4816 } 4817 4818 if (Invalid) 4819 ExDecl->setInvalidDecl(); 4820 4821 return ExDecl; 4822} 4823 4824/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4825/// handler. 4826Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4827 TypeSourceInfo *TInfo = 0; 4828 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4829 4830 bool Invalid = D.isInvalidType(); 4831 IdentifierInfo *II = D.getIdentifier(); 4832 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 4833 LookupOrdinaryName, 4834 ForRedeclaration)) { 4835 // The scope should be freshly made just for us. There is just no way 4836 // it contains any previous declaration. 4837 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4838 if (PrevDecl->isTemplateParameter()) { 4839 // Maybe we will complain about the shadowed template parameter. 4840 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4841 } 4842 } 4843 4844 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4845 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4846 << D.getCXXScopeSpec().getRange(); 4847 Invalid = true; 4848 } 4849 4850 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 4851 D.getIdentifier(), 4852 D.getIdentifierLoc(), 4853 D.getDeclSpec().getSourceRange()); 4854 4855 if (Invalid) 4856 ExDecl->setInvalidDecl(); 4857 4858 // Add the exception declaration into this scope. 4859 if (II) 4860 PushOnScopeChains(ExDecl, S); 4861 else 4862 CurContext->addDecl(ExDecl); 4863 4864 ProcessDeclAttributes(S, ExDecl, D); 4865 return DeclPtrTy::make(ExDecl); 4866} 4867 4868Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4869 ExprArg assertexpr, 4870 ExprArg assertmessageexpr) { 4871 Expr *AssertExpr = (Expr *)assertexpr.get(); 4872 StringLiteral *AssertMessage = 4873 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4874 4875 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4876 llvm::APSInt Value(32); 4877 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4878 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4879 AssertExpr->getSourceRange(); 4880 return DeclPtrTy(); 4881 } 4882 4883 if (Value == 0) { 4884 Diag(AssertLoc, diag::err_static_assert_failed) 4885 << AssertMessage->getString() << AssertExpr->getSourceRange(); 4886 } 4887 } 4888 4889 assertexpr.release(); 4890 assertmessageexpr.release(); 4891 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4892 AssertExpr, AssertMessage); 4893 4894 CurContext->addDecl(Decl); 4895 return DeclPtrTy::make(Decl); 4896} 4897 4898/// \brief Perform semantic analysis of the given friend type declaration. 4899/// 4900/// \returns A friend declaration that. 4901FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 4902 TypeSourceInfo *TSInfo) { 4903 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 4904 4905 QualType T = TSInfo->getType(); 4906 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 4907 4908 if (!getLangOptions().CPlusPlus0x) { 4909 // C++03 [class.friend]p2: 4910 // An elaborated-type-specifier shall be used in a friend declaration 4911 // for a class.* 4912 // 4913 // * The class-key of the elaborated-type-specifier is required. 4914 if (!ActiveTemplateInstantiations.empty()) { 4915 // Do not complain about the form of friend template types during 4916 // template instantiation; we will already have complained when the 4917 // template was declared. 4918 } else if (!T->isElaboratedTypeSpecifier()) { 4919 // If we evaluated the type to a record type, suggest putting 4920 // a tag in front. 4921 if (const RecordType *RT = T->getAs<RecordType>()) { 4922 RecordDecl *RD = RT->getDecl(); 4923 4924 std::string InsertionText = std::string(" ") + RD->getKindName(); 4925 4926 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 4927 << (unsigned) RD->getTagKind() 4928 << T 4929 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 4930 InsertionText); 4931 } else { 4932 Diag(FriendLoc, diag::ext_nonclass_type_friend) 4933 << T 4934 << SourceRange(FriendLoc, TypeRange.getEnd()); 4935 } 4936 } else if (T->getAs<EnumType>()) { 4937 Diag(FriendLoc, diag::ext_enum_friend) 4938 << T 4939 << SourceRange(FriendLoc, TypeRange.getEnd()); 4940 } 4941 } 4942 4943 // C++0x [class.friend]p3: 4944 // If the type specifier in a friend declaration designates a (possibly 4945 // cv-qualified) class type, that class is declared as a friend; otherwise, 4946 // the friend declaration is ignored. 4947 4948 // FIXME: C++0x has some syntactic restrictions on friend type declarations 4949 // in [class.friend]p3 that we do not implement. 4950 4951 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 4952} 4953 4954/// Handle a friend type declaration. This works in tandem with 4955/// ActOnTag. 4956/// 4957/// Notes on friend class templates: 4958/// 4959/// We generally treat friend class declarations as if they were 4960/// declaring a class. So, for example, the elaborated type specifier 4961/// in a friend declaration is required to obey the restrictions of a 4962/// class-head (i.e. no typedefs in the scope chain), template 4963/// parameters are required to match up with simple template-ids, &c. 4964/// However, unlike when declaring a template specialization, it's 4965/// okay to refer to a template specialization without an empty 4966/// template parameter declaration, e.g. 4967/// friend class A<T>::B<unsigned>; 4968/// We permit this as a special case; if there are any template 4969/// parameters present at all, require proper matching, i.e. 4970/// template <> template <class T> friend class A<int>::B; 4971Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4972 MultiTemplateParamsArg TempParams) { 4973 SourceLocation Loc = DS.getSourceRange().getBegin(); 4974 4975 assert(DS.isFriendSpecified()); 4976 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4977 4978 // Try to convert the decl specifier to a type. This works for 4979 // friend templates because ActOnTag never produces a ClassTemplateDecl 4980 // for a TUK_Friend. 4981 Declarator TheDeclarator(DS, Declarator::MemberContext); 4982 TypeSourceInfo *TSI; 4983 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 4984 if (TheDeclarator.isInvalidType()) 4985 return DeclPtrTy(); 4986 4987 if (!TSI) 4988 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 4989 4990 // This is definitely an error in C++98. It's probably meant to 4991 // be forbidden in C++0x, too, but the specification is just 4992 // poorly written. 4993 // 4994 // The problem is with declarations like the following: 4995 // template <T> friend A<T>::foo; 4996 // where deciding whether a class C is a friend or not now hinges 4997 // on whether there exists an instantiation of A that causes 4998 // 'foo' to equal C. There are restrictions on class-heads 4999 // (which we declare (by fiat) elaborated friend declarations to 5000 // be) that makes this tractable. 5001 // 5002 // FIXME: handle "template <> friend class A<T>;", which 5003 // is possibly well-formed? Who even knows? 5004 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5005 Diag(Loc, diag::err_tagless_friend_type_template) 5006 << DS.getSourceRange(); 5007 return DeclPtrTy(); 5008 } 5009 5010 // C++98 [class.friend]p1: A friend of a class is a function 5011 // or class that is not a member of the class . . . 5012 // This is fixed in DR77, which just barely didn't make the C++03 5013 // deadline. It's also a very silly restriction that seriously 5014 // affects inner classes and which nobody else seems to implement; 5015 // thus we never diagnose it, not even in -pedantic. 5016 // 5017 // But note that we could warn about it: it's always useless to 5018 // friend one of your own members (it's not, however, worthless to 5019 // friend a member of an arbitrary specialization of your template). 5020 5021 Decl *D; 5022 if (unsigned NumTempParamLists = TempParams.size()) 5023 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5024 NumTempParamLists, 5025 (TemplateParameterList**) TempParams.release(), 5026 TSI, 5027 DS.getFriendSpecLoc()); 5028 else 5029 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5030 5031 if (!D) 5032 return DeclPtrTy(); 5033 5034 D->setAccess(AS_public); 5035 CurContext->addDecl(D); 5036 5037 return DeclPtrTy::make(D); 5038} 5039 5040Sema::DeclPtrTy 5041Sema::ActOnFriendFunctionDecl(Scope *S, 5042 Declarator &D, 5043 bool IsDefinition, 5044 MultiTemplateParamsArg TemplateParams) { 5045 const DeclSpec &DS = D.getDeclSpec(); 5046 5047 assert(DS.isFriendSpecified()); 5048 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5049 5050 SourceLocation Loc = D.getIdentifierLoc(); 5051 TypeSourceInfo *TInfo = 0; 5052 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5053 5054 // C++ [class.friend]p1 5055 // A friend of a class is a function or class.... 5056 // Note that this sees through typedefs, which is intended. 5057 // It *doesn't* see through dependent types, which is correct 5058 // according to [temp.arg.type]p3: 5059 // If a declaration acquires a function type through a 5060 // type dependent on a template-parameter and this causes 5061 // a declaration that does not use the syntactic form of a 5062 // function declarator to have a function type, the program 5063 // is ill-formed. 5064 if (!T->isFunctionType()) { 5065 Diag(Loc, diag::err_unexpected_friend); 5066 5067 // It might be worthwhile to try to recover by creating an 5068 // appropriate declaration. 5069 return DeclPtrTy(); 5070 } 5071 5072 // C++ [namespace.memdef]p3 5073 // - If a friend declaration in a non-local class first declares a 5074 // class or function, the friend class or function is a member 5075 // of the innermost enclosing namespace. 5076 // - The name of the friend is not found by simple name lookup 5077 // until a matching declaration is provided in that namespace 5078 // scope (either before or after the class declaration granting 5079 // friendship). 5080 // - If a friend function is called, its name may be found by the 5081 // name lookup that considers functions from namespaces and 5082 // classes associated with the types of the function arguments. 5083 // - When looking for a prior declaration of a class or a function 5084 // declared as a friend, scopes outside the innermost enclosing 5085 // namespace scope are not considered. 5086 5087 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5088 DeclarationName Name = GetNameForDeclarator(D); 5089 assert(Name); 5090 5091 // The context we found the declaration in, or in which we should 5092 // create the declaration. 5093 DeclContext *DC; 5094 5095 // FIXME: handle local classes 5096 5097 // Recover from invalid scope qualifiers as if they just weren't there. 5098 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5099 ForRedeclaration); 5100 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5101 // FIXME: RequireCompleteDeclContext 5102 DC = computeDeclContext(ScopeQual); 5103 5104 // FIXME: handle dependent contexts 5105 if (!DC) return DeclPtrTy(); 5106 5107 LookupQualifiedName(Previous, DC); 5108 5109 // If searching in that context implicitly found a declaration in 5110 // a different context, treat it like it wasn't found at all. 5111 // TODO: better diagnostics for this case. Suggesting the right 5112 // qualified scope would be nice... 5113 // FIXME: getRepresentativeDecl() is not right here at all 5114 if (Previous.empty() || 5115 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5116 D.setInvalidType(); 5117 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5118 return DeclPtrTy(); 5119 } 5120 5121 // C++ [class.friend]p1: A friend of a class is a function or 5122 // class that is not a member of the class . . . 5123 if (DC->Equals(CurContext)) 5124 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5125 5126 // Otherwise walk out to the nearest namespace scope looking for matches. 5127 } else { 5128 // TODO: handle local class contexts. 5129 5130 DC = CurContext; 5131 while (true) { 5132 // Skip class contexts. If someone can cite chapter and verse 5133 // for this behavior, that would be nice --- it's what GCC and 5134 // EDG do, and it seems like a reasonable intent, but the spec 5135 // really only says that checks for unqualified existing 5136 // declarations should stop at the nearest enclosing namespace, 5137 // not that they should only consider the nearest enclosing 5138 // namespace. 5139 while (DC->isRecord()) 5140 DC = DC->getParent(); 5141 5142 LookupQualifiedName(Previous, DC); 5143 5144 // TODO: decide what we think about using declarations. 5145 if (!Previous.empty()) 5146 break; 5147 5148 if (DC->isFileContext()) break; 5149 DC = DC->getParent(); 5150 } 5151 5152 // C++ [class.friend]p1: A friend of a class is a function or 5153 // class that is not a member of the class . . . 5154 // C++0x changes this for both friend types and functions. 5155 // Most C++ 98 compilers do seem to give an error here, so 5156 // we do, too. 5157 if (!Previous.empty() && DC->Equals(CurContext) 5158 && !getLangOptions().CPlusPlus0x) 5159 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5160 } 5161 5162 if (DC->isFileContext()) { 5163 // This implies that it has to be an operator or function. 5164 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5165 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5166 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5167 Diag(Loc, diag::err_introducing_special_friend) << 5168 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5169 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5170 return DeclPtrTy(); 5171 } 5172 } 5173 5174 bool Redeclaration = false; 5175 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5176 move(TemplateParams), 5177 IsDefinition, 5178 Redeclaration); 5179 if (!ND) return DeclPtrTy(); 5180 5181 assert(ND->getDeclContext() == DC); 5182 assert(ND->getLexicalDeclContext() == CurContext); 5183 5184 // Add the function declaration to the appropriate lookup tables, 5185 // adjusting the redeclarations list as necessary. We don't 5186 // want to do this yet if the friending class is dependent. 5187 // 5188 // Also update the scope-based lookup if the target context's 5189 // lookup context is in lexical scope. 5190 if (!CurContext->isDependentContext()) { 5191 DC = DC->getLookupContext(); 5192 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5193 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5194 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5195 } 5196 5197 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5198 D.getIdentifierLoc(), ND, 5199 DS.getFriendSpecLoc()); 5200 FrD->setAccess(AS_public); 5201 CurContext->addDecl(FrD); 5202 5203 return DeclPtrTy::make(ND); 5204} 5205 5206void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5207 AdjustDeclIfTemplate(dcl); 5208 5209 Decl *Dcl = dcl.getAs<Decl>(); 5210 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5211 if (!Fn) { 5212 Diag(DelLoc, diag::err_deleted_non_function); 5213 return; 5214 } 5215 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5216 Diag(DelLoc, diag::err_deleted_decl_not_first); 5217 Diag(Prev->getLocation(), diag::note_previous_declaration); 5218 // If the declaration wasn't the first, we delete the function anyway for 5219 // recovery. 5220 } 5221 Fn->setDeleted(); 5222} 5223 5224static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5225 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5226 ++CI) { 5227 Stmt *SubStmt = *CI; 5228 if (!SubStmt) 5229 continue; 5230 if (isa<ReturnStmt>(SubStmt)) 5231 Self.Diag(SubStmt->getSourceRange().getBegin(), 5232 diag::err_return_in_constructor_handler); 5233 if (!isa<Expr>(SubStmt)) 5234 SearchForReturnInStmt(Self, SubStmt); 5235 } 5236} 5237 5238void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5239 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5240 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5241 SearchForReturnInStmt(*this, Handler); 5242 } 5243} 5244 5245bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5246 const CXXMethodDecl *Old) { 5247 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5248 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5249 5250 if (Context.hasSameType(NewTy, OldTy) || 5251 NewTy->isDependentType() || OldTy->isDependentType()) 5252 return false; 5253 5254 // Check if the return types are covariant 5255 QualType NewClassTy, OldClassTy; 5256 5257 /// Both types must be pointers or references to classes. 5258 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5259 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5260 NewClassTy = NewPT->getPointeeType(); 5261 OldClassTy = OldPT->getPointeeType(); 5262 } 5263 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5264 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5265 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5266 NewClassTy = NewRT->getPointeeType(); 5267 OldClassTy = OldRT->getPointeeType(); 5268 } 5269 } 5270 } 5271 5272 // The return types aren't either both pointers or references to a class type. 5273 if (NewClassTy.isNull()) { 5274 Diag(New->getLocation(), 5275 diag::err_different_return_type_for_overriding_virtual_function) 5276 << New->getDeclName() << NewTy << OldTy; 5277 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5278 5279 return true; 5280 } 5281 5282 // C++ [class.virtual]p6: 5283 // If the return type of D::f differs from the return type of B::f, the 5284 // class type in the return type of D::f shall be complete at the point of 5285 // declaration of D::f or shall be the class type D. 5286 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5287 if (!RT->isBeingDefined() && 5288 RequireCompleteType(New->getLocation(), NewClassTy, 5289 PDiag(diag::err_covariant_return_incomplete) 5290 << New->getDeclName())) 5291 return true; 5292 } 5293 5294 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5295 // Check if the new class derives from the old class. 5296 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5297 Diag(New->getLocation(), 5298 diag::err_covariant_return_not_derived) 5299 << New->getDeclName() << NewTy << OldTy; 5300 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5301 return true; 5302 } 5303 5304 // Check if we the conversion from derived to base is valid. 5305 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5306 diag::err_covariant_return_inaccessible_base, 5307 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5308 // FIXME: Should this point to the return type? 5309 New->getLocation(), SourceRange(), New->getDeclName())) { 5310 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5311 return true; 5312 } 5313 } 5314 5315 // The qualifiers of the return types must be the same. 5316 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5317 Diag(New->getLocation(), 5318 diag::err_covariant_return_type_different_qualifications) 5319 << New->getDeclName() << NewTy << OldTy; 5320 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5321 return true; 5322 }; 5323 5324 5325 // The new class type must have the same or less qualifiers as the old type. 5326 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5327 Diag(New->getLocation(), 5328 diag::err_covariant_return_type_class_type_more_qualified) 5329 << New->getDeclName() << NewTy << OldTy; 5330 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5331 return true; 5332 }; 5333 5334 return false; 5335} 5336 5337bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5338 const CXXMethodDecl *Old) 5339{ 5340 if (Old->hasAttr<FinalAttr>()) { 5341 Diag(New->getLocation(), diag::err_final_function_overridden) 5342 << New->getDeclName(); 5343 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5344 return true; 5345 } 5346 5347 return false; 5348} 5349 5350/// \brief Mark the given method pure. 5351/// 5352/// \param Method the method to be marked pure. 5353/// 5354/// \param InitRange the source range that covers the "0" initializer. 5355bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5356 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5357 Method->setPure(); 5358 5359 // A class is abstract if at least one function is pure virtual. 5360 Method->getParent()->setAbstract(true); 5361 return false; 5362 } 5363 5364 if (!Method->isInvalidDecl()) 5365 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5366 << Method->getDeclName() << InitRange; 5367 return true; 5368} 5369 5370/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5371/// an initializer for the out-of-line declaration 'Dcl'. The scope 5372/// is a fresh scope pushed for just this purpose. 5373/// 5374/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5375/// static data member of class X, names should be looked up in the scope of 5376/// class X. 5377void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5378 // If there is no declaration, there was an error parsing it. 5379 Decl *D = Dcl.getAs<Decl>(); 5380 if (D == 0) return; 5381 5382 // We should only get called for declarations with scope specifiers, like: 5383 // int foo::bar; 5384 assert(D->isOutOfLine()); 5385 EnterDeclaratorContext(S, D->getDeclContext()); 5386} 5387 5388/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5389/// initializer for the out-of-line declaration 'Dcl'. 5390void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5391 // If there is no declaration, there was an error parsing it. 5392 Decl *D = Dcl.getAs<Decl>(); 5393 if (D == 0) return; 5394 5395 assert(D->isOutOfLine()); 5396 ExitDeclaratorContext(S); 5397} 5398 5399/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5400/// C++ if/switch/while/for statement. 5401/// e.g: "if (int x = f()) {...}" 5402Action::DeclResult 5403Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5404 // C++ 6.4p2: 5405 // The declarator shall not specify a function or an array. 5406 // The type-specifier-seq shall not contain typedef and shall not declare a 5407 // new class or enumeration. 5408 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5409 "Parser allowed 'typedef' as storage class of condition decl."); 5410 5411 TypeSourceInfo *TInfo = 0; 5412 TagDecl *OwnedTag = 0; 5413 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5414 5415 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5416 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5417 // would be created and CXXConditionDeclExpr wants a VarDecl. 5418 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5419 << D.getSourceRange(); 5420 return DeclResult(); 5421 } else if (OwnedTag && OwnedTag->isDefinition()) { 5422 // The type-specifier-seq shall not declare a new class or enumeration. 5423 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5424 } 5425 5426 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5427 if (!Dcl) 5428 return DeclResult(); 5429 5430 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5431 VD->setDeclaredInCondition(true); 5432 return Dcl; 5433} 5434 5435static bool needsVTable(CXXMethodDecl *MD, ASTContext &Context) { 5436 // Ignore dependent types. 5437 if (MD->isDependentContext()) 5438 return false; 5439 5440 // Ignore declarations that are not definitions. 5441 if (!MD->isThisDeclarationADefinition()) 5442 return false; 5443 5444 CXXRecordDecl *RD = MD->getParent(); 5445 5446 // Ignore classes without a vtable. 5447 if (!RD->isDynamicClass()) 5448 return false; 5449 5450 switch (MD->getParent()->getTemplateSpecializationKind()) { 5451 case TSK_Undeclared: 5452 case TSK_ExplicitSpecialization: 5453 // Classes that aren't instantiations of templates don't need their 5454 // virtual methods marked until we see the definition of the key 5455 // function. 5456 break; 5457 5458 case TSK_ImplicitInstantiation: 5459 // This is a constructor of a class template; mark all of the virtual 5460 // members as referenced to ensure that they get instantiatied. 5461 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5462 return true; 5463 break; 5464 5465 case TSK_ExplicitInstantiationDeclaration: 5466 return false; 5467 5468 case TSK_ExplicitInstantiationDefinition: 5469 // This is method of a explicit instantiation; mark all of the virtual 5470 // members as referenced to ensure that they get instantiatied. 5471 return true; 5472 } 5473 5474 // Consider only out-of-line definitions of member functions. When we see 5475 // an inline definition, it's too early to compute the key function. 5476 if (!MD->isOutOfLine()) 5477 return false; 5478 5479 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5480 5481 // If there is no key function, we will need a copy of the vtable. 5482 if (!KeyFunction) 5483 return true; 5484 5485 // If this is the key function, we need to mark virtual members. 5486 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5487 return true; 5488 5489 return false; 5490} 5491 5492void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5493 CXXMethodDecl *MD) { 5494 CXXRecordDecl *RD = MD->getParent(); 5495 5496 // We will need to mark all of the virtual members as referenced to build the 5497 // vtable. 5498 if (!needsVTable(MD, Context)) 5499 return; 5500 5501 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5502 if (kind == TSK_ImplicitInstantiation) 5503 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5504 else 5505 MarkVirtualMembersReferenced(Loc, RD); 5506} 5507 5508bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5509 if (ClassesWithUnmarkedVirtualMembers.empty()) 5510 return false; 5511 5512 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5513 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5514 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5515 ClassesWithUnmarkedVirtualMembers.pop_back(); 5516 MarkVirtualMembersReferenced(Loc, RD); 5517 } 5518 5519 return true; 5520} 5521 5522void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5523 const CXXRecordDecl *RD) { 5524 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5525 e = RD->method_end(); i != e; ++i) { 5526 CXXMethodDecl *MD = *i; 5527 5528 // C++ [basic.def.odr]p2: 5529 // [...] A virtual member function is used if it is not pure. [...] 5530 if (MD->isVirtual() && !MD->isPure()) 5531 MarkDeclarationReferenced(Loc, MD); 5532 } 5533 5534 // Only classes that have virtual bases need a VTT. 5535 if (RD->getNumVBases() == 0) 5536 return; 5537 5538 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5539 e = RD->bases_end(); i != e; ++i) { 5540 const CXXRecordDecl *Base = 5541 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5542 if (i->isVirtual()) 5543 continue; 5544 if (Base->getNumVBases() == 0) 5545 continue; 5546 MarkVirtualMembersReferenced(Loc, Base); 5547 } 5548} 5549