SemaDeclCXX.cpp revision b020748a9954c995f2e616f50bb9ed4fe2df1f72
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 const CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1080 bool NotUnknownSpecialization = false; 1081 DeclContext *DC = computeDeclContext(SS, false); 1082 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1083 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1084 1085 if (!NotUnknownSpecialization) { 1086 // When the scope specifier can refer to a member of an unknown 1087 // specialization, we take it as a type name. 1088 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1089 *MemberOrBase, SS.getRange()); 1090 if (BaseType.isNull()) 1091 return true; 1092 1093 R.clear(); 1094 } 1095 } 1096 1097 // If no results were found, try to correct typos. 1098 if (R.empty() && BaseType.isNull() && 1099 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1100 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1101 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1102 // We have found a non-static data member with a similar 1103 // name to what was typed; complain and initialize that 1104 // member. 1105 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1106 << MemberOrBase << true << R.getLookupName() 1107 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1108 R.getLookupName().getAsString()); 1109 Diag(Member->getLocation(), diag::note_previous_decl) 1110 << Member->getDeclName(); 1111 1112 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1113 LParenLoc, RParenLoc); 1114 } 1115 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1116 const CXXBaseSpecifier *DirectBaseSpec; 1117 const CXXBaseSpecifier *VirtualBaseSpec; 1118 if (FindBaseInitializer(*this, ClassDecl, 1119 Context.getTypeDeclType(Type), 1120 DirectBaseSpec, VirtualBaseSpec)) { 1121 // We have found a direct or virtual base class with a 1122 // similar name to what was typed; complain and initialize 1123 // that base class. 1124 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1125 << MemberOrBase << false << R.getLookupName() 1126 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1127 R.getLookupName().getAsString()); 1128 1129 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1130 : VirtualBaseSpec; 1131 Diag(BaseSpec->getSourceRange().getBegin(), 1132 diag::note_base_class_specified_here) 1133 << BaseSpec->getType() 1134 << BaseSpec->getSourceRange(); 1135 1136 TyD = Type; 1137 } 1138 } 1139 } 1140 1141 if (!TyD && BaseType.isNull()) { 1142 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1143 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1144 return true; 1145 } 1146 } 1147 1148 if (BaseType.isNull()) { 1149 BaseType = Context.getTypeDeclType(TyD); 1150 if (SS.isSet()) { 1151 NestedNameSpecifier *Qualifier = 1152 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1153 1154 // FIXME: preserve source range information 1155 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1156 } 1157 } 1158 } 1159 1160 if (!TInfo) 1161 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1162 1163 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1164 LParenLoc, RParenLoc, ClassDecl); 1165} 1166 1167/// Checks an initializer expression for use of uninitialized fields, such as 1168/// containing the field that is being initialized. Returns true if there is an 1169/// uninitialized field was used an updates the SourceLocation parameter; false 1170/// otherwise. 1171static bool InitExprContainsUninitializedFields(const Stmt* S, 1172 const FieldDecl* LhsField, 1173 SourceLocation* L) { 1174 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1175 if (ME) { 1176 const NamedDecl* RhsField = ME->getMemberDecl(); 1177 if (RhsField == LhsField) { 1178 // Initializing a field with itself. Throw a warning. 1179 // But wait; there are exceptions! 1180 // Exception #1: The field may not belong to this record. 1181 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1182 const Expr* base = ME->getBase(); 1183 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1184 // Even though the field matches, it does not belong to this record. 1185 return false; 1186 } 1187 // None of the exceptions triggered; return true to indicate an 1188 // uninitialized field was used. 1189 *L = ME->getMemberLoc(); 1190 return true; 1191 } 1192 } 1193 bool found = false; 1194 for (Stmt::const_child_iterator it = S->child_begin(); 1195 it != S->child_end() && found == false; 1196 ++it) { 1197 if (isa<CallExpr>(S)) { 1198 // Do not descend into function calls or constructors, as the use 1199 // of an uninitialized field may be valid. One would have to inspect 1200 // the contents of the function/ctor to determine if it is safe or not. 1201 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1202 // may be safe, depending on what the function/ctor does. 1203 continue; 1204 } 1205 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1206 } 1207 return found; 1208} 1209 1210Sema::MemInitResult 1211Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1212 unsigned NumArgs, SourceLocation IdLoc, 1213 SourceLocation LParenLoc, 1214 SourceLocation RParenLoc) { 1215 // Diagnose value-uses of fields to initialize themselves, e.g. 1216 // foo(foo) 1217 // where foo is not also a parameter to the constructor. 1218 // TODO: implement -Wuninitialized and fold this into that framework. 1219 for (unsigned i = 0; i < NumArgs; ++i) { 1220 SourceLocation L; 1221 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1222 // FIXME: Return true in the case when other fields are used before being 1223 // uninitialized. For example, let this field be the i'th field. When 1224 // initializing the i'th field, throw a warning if any of the >= i'th 1225 // fields are used, as they are not yet initialized. 1226 // Right now we are only handling the case where the i'th field uses 1227 // itself in its initializer. 1228 Diag(L, diag::warn_field_is_uninit); 1229 } 1230 } 1231 1232 bool HasDependentArg = false; 1233 for (unsigned i = 0; i < NumArgs; i++) 1234 HasDependentArg |= Args[i]->isTypeDependent(); 1235 1236 QualType FieldType = Member->getType(); 1237 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1238 FieldType = Array->getElementType(); 1239 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1240 if (FieldType->isDependentType() || HasDependentArg) { 1241 // Can't check initialization for a member of dependent type or when 1242 // any of the arguments are type-dependent expressions. 1243 OwningExprResult Init 1244 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1245 RParenLoc)); 1246 1247 // Erase any temporaries within this evaluation context; we're not 1248 // going to track them in the AST, since we'll be rebuilding the 1249 // ASTs during template instantiation. 1250 ExprTemporaries.erase( 1251 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1252 ExprTemporaries.end()); 1253 1254 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1255 LParenLoc, 1256 Init.takeAs<Expr>(), 1257 RParenLoc); 1258 1259 } 1260 1261 if (Member->isInvalidDecl()) 1262 return true; 1263 1264 // Initialize the member. 1265 InitializedEntity MemberEntity = 1266 InitializedEntity::InitializeMember(Member, 0); 1267 InitializationKind Kind = 1268 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1269 1270 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1271 1272 OwningExprResult MemberInit = 1273 InitSeq.Perform(*this, MemberEntity, Kind, 1274 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1275 if (MemberInit.isInvalid()) 1276 return true; 1277 1278 // C++0x [class.base.init]p7: 1279 // The initialization of each base and member constitutes a 1280 // full-expression. 1281 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1282 if (MemberInit.isInvalid()) 1283 return true; 1284 1285 // If we are in a dependent context, template instantiation will 1286 // perform this type-checking again. Just save the arguments that we 1287 // received in a ParenListExpr. 1288 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1289 // of the information that we have about the member 1290 // initializer. However, deconstructing the ASTs is a dicey process, 1291 // and this approach is far more likely to get the corner cases right. 1292 if (CurContext->isDependentContext()) { 1293 // Bump the reference count of all of the arguments. 1294 for (unsigned I = 0; I != NumArgs; ++I) 1295 Args[I]->Retain(); 1296 1297 OwningExprResult Init 1298 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1299 RParenLoc)); 1300 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1301 LParenLoc, 1302 Init.takeAs<Expr>(), 1303 RParenLoc); 1304 } 1305 1306 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1307 LParenLoc, 1308 MemberInit.takeAs<Expr>(), 1309 RParenLoc); 1310} 1311 1312Sema::MemInitResult 1313Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1314 Expr **Args, unsigned NumArgs, 1315 SourceLocation LParenLoc, SourceLocation RParenLoc, 1316 CXXRecordDecl *ClassDecl) { 1317 bool HasDependentArg = false; 1318 for (unsigned i = 0; i < NumArgs; i++) 1319 HasDependentArg |= Args[i]->isTypeDependent(); 1320 1321 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1322 if (BaseType->isDependentType() || HasDependentArg) { 1323 // Can't check initialization for a base of dependent type or when 1324 // any of the arguments are type-dependent expressions. 1325 OwningExprResult BaseInit 1326 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1327 RParenLoc)); 1328 1329 // Erase any temporaries within this evaluation context; we're not 1330 // going to track them in the AST, since we'll be rebuilding the 1331 // ASTs during template instantiation. 1332 ExprTemporaries.erase( 1333 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1334 ExprTemporaries.end()); 1335 1336 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1337 LParenLoc, 1338 BaseInit.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 if (!BaseType->isRecordType()) 1343 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1344 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1345 1346 // C++ [class.base.init]p2: 1347 // [...] Unless the mem-initializer-id names a nonstatic data 1348 // member of the constructor’s class or a direct or virtual base 1349 // of that class, the mem-initializer is ill-formed. A 1350 // mem-initializer-list can initialize a base class using any 1351 // name that denotes that base class type. 1352 1353 // Check for direct and virtual base classes. 1354 const CXXBaseSpecifier *DirectBaseSpec = 0; 1355 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1356 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1357 VirtualBaseSpec); 1358 1359 // C++ [base.class.init]p2: 1360 // If a mem-initializer-id is ambiguous because it designates both 1361 // a direct non-virtual base class and an inherited virtual base 1362 // class, the mem-initializer is ill-formed. 1363 if (DirectBaseSpec && VirtualBaseSpec) 1364 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1365 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1366 // C++ [base.class.init]p2: 1367 // Unless the mem-initializer-id names a nonstatic data membeer of the 1368 // constructor's class ot a direst or virtual base of that class, the 1369 // mem-initializer is ill-formed. 1370 if (!DirectBaseSpec && !VirtualBaseSpec) 1371 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1372 << BaseType << ClassDecl->getNameAsCString() 1373 << BaseTInfo->getTypeLoc().getSourceRange(); 1374 1375 CXXBaseSpecifier *BaseSpec 1376 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1377 if (!BaseSpec) 1378 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1379 1380 // Initialize the base. 1381 InitializedEntity BaseEntity = 1382 InitializedEntity::InitializeBase(Context, BaseSpec); 1383 InitializationKind Kind = 1384 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1385 1386 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1387 1388 OwningExprResult BaseInit = 1389 InitSeq.Perform(*this, BaseEntity, Kind, 1390 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1391 if (BaseInit.isInvalid()) 1392 return true; 1393 1394 // C++0x [class.base.init]p7: 1395 // The initialization of each base and member constitutes a 1396 // full-expression. 1397 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1398 if (BaseInit.isInvalid()) 1399 return true; 1400 1401 // If we are in a dependent context, template instantiation will 1402 // perform this type-checking again. Just save the arguments that we 1403 // received in a ParenListExpr. 1404 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1405 // of the information that we have about the base 1406 // initializer. However, deconstructing the ASTs is a dicey process, 1407 // and this approach is far more likely to get the corner cases right. 1408 if (CurContext->isDependentContext()) { 1409 // Bump the reference count of all of the arguments. 1410 for (unsigned I = 0; I != NumArgs; ++I) 1411 Args[I]->Retain(); 1412 1413 OwningExprResult Init 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1417 LParenLoc, 1418 Init.takeAs<Expr>(), 1419 RParenLoc); 1420 } 1421 1422 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1423 LParenLoc, 1424 BaseInit.takeAs<Expr>(), 1425 RParenLoc); 1426} 1427 1428bool 1429Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1430 CXXBaseOrMemberInitializer **Initializers, 1431 unsigned NumInitializers, 1432 bool IsImplicitConstructor, 1433 bool AnyErrors) { 1434 // We need to build the initializer AST according to order of construction 1435 // and not what user specified in the Initializers list. 1436 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1437 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1438 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1439 bool HasDependentBaseInit = false; 1440 bool HadError = false; 1441 1442 for (unsigned i = 0; i < NumInitializers; i++) { 1443 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1444 if (Member->isBaseInitializer()) { 1445 if (Member->getBaseClass()->isDependentType()) 1446 HasDependentBaseInit = true; 1447 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1448 } else { 1449 AllBaseFields[Member->getMember()] = Member; 1450 } 1451 } 1452 1453 if (HasDependentBaseInit) { 1454 // FIXME. This does not preserve the ordering of the initializers. 1455 // Try (with -Wreorder) 1456 // template<class X> struct A {}; 1457 // template<class X> struct B : A<X> { 1458 // B() : x1(10), A<X>() {} 1459 // int x1; 1460 // }; 1461 // B<int> x; 1462 // On seeing one dependent type, we should essentially exit this routine 1463 // while preserving user-declared initializer list. When this routine is 1464 // called during instantiatiation process, this routine will rebuild the 1465 // ordered initializer list correctly. 1466 1467 // If we have a dependent base initialization, we can't determine the 1468 // association between initializers and bases; just dump the known 1469 // initializers into the list, and don't try to deal with other bases. 1470 for (unsigned i = 0; i < NumInitializers; i++) { 1471 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1472 if (Member->isBaseInitializer()) 1473 AllToInit.push_back(Member); 1474 } 1475 } else { 1476 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1477 1478 // Push virtual bases before others. 1479 for (CXXRecordDecl::base_class_iterator VBase = 1480 ClassDecl->vbases_begin(), 1481 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1482 if (VBase->getType()->isDependentType()) 1483 continue; 1484 if (CXXBaseOrMemberInitializer *Value 1485 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1486 AllToInit.push_back(Value); 1487 } else if (!AnyErrors) { 1488 InitializedEntity InitEntity 1489 = InitializedEntity::InitializeBase(Context, VBase); 1490 InitializationKind InitKind 1491 = InitializationKind::CreateDefault(Constructor->getLocation()); 1492 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1493 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1494 MultiExprArg(*this, 0, 0)); 1495 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1496 if (BaseInit.isInvalid()) { 1497 HadError = true; 1498 continue; 1499 } 1500 1501 // Don't attach synthesized base initializers in a dependent 1502 // context; they'll be checked again at template instantiation 1503 // time. 1504 if (CurContext->isDependentContext()) 1505 continue; 1506 1507 CXXBaseOrMemberInitializer *CXXBaseInit = 1508 new (Context) CXXBaseOrMemberInitializer(Context, 1509 Context.getTrivialTypeSourceInfo(VBase->getType(), 1510 SourceLocation()), 1511 SourceLocation(), 1512 BaseInit.takeAs<Expr>(), 1513 SourceLocation()); 1514 AllToInit.push_back(CXXBaseInit); 1515 } 1516 } 1517 1518 for (CXXRecordDecl::base_class_iterator Base = 1519 ClassDecl->bases_begin(), 1520 E = ClassDecl->bases_end(); Base != E; ++Base) { 1521 // Virtuals are in the virtual base list and already constructed. 1522 if (Base->isVirtual()) 1523 continue; 1524 // Skip dependent types. 1525 if (Base->getType()->isDependentType()) 1526 continue; 1527 if (CXXBaseOrMemberInitializer *Value 1528 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1529 AllToInit.push_back(Value); 1530 } 1531 else if (!AnyErrors) { 1532 InitializedEntity InitEntity 1533 = InitializedEntity::InitializeBase(Context, Base); 1534 InitializationKind InitKind 1535 = InitializationKind::CreateDefault(Constructor->getLocation()); 1536 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1537 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1538 MultiExprArg(*this, 0, 0)); 1539 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1540 if (BaseInit.isInvalid()) { 1541 HadError = true; 1542 continue; 1543 } 1544 1545 // Don't attach synthesized base initializers in a dependent 1546 // context; they'll be regenerated at template instantiation 1547 // time. 1548 if (CurContext->isDependentContext()) 1549 continue; 1550 1551 CXXBaseOrMemberInitializer *CXXBaseInit = 1552 new (Context) CXXBaseOrMemberInitializer(Context, 1553 Context.getTrivialTypeSourceInfo(Base->getType(), 1554 SourceLocation()), 1555 SourceLocation(), 1556 BaseInit.takeAs<Expr>(), 1557 SourceLocation()); 1558 AllToInit.push_back(CXXBaseInit); 1559 } 1560 } 1561 } 1562 1563 // non-static data members. 1564 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1565 E = ClassDecl->field_end(); Field != E; ++Field) { 1566 if ((*Field)->isAnonymousStructOrUnion()) { 1567 if (const RecordType *FieldClassType = 1568 Field->getType()->getAs<RecordType>()) { 1569 CXXRecordDecl *FieldClassDecl 1570 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1571 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1572 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1573 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1574 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1575 // set to the anonymous union data member used in the initializer 1576 // list. 1577 Value->setMember(*Field); 1578 Value->setAnonUnionMember(*FA); 1579 AllToInit.push_back(Value); 1580 break; 1581 } 1582 } 1583 } 1584 continue; 1585 } 1586 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1587 AllToInit.push_back(Value); 1588 continue; 1589 } 1590 1591 if ((*Field)->getType()->isDependentType() || AnyErrors) 1592 continue; 1593 1594 QualType FT = Context.getBaseElementType((*Field)->getType()); 1595 if (FT->getAs<RecordType>()) { 1596 InitializedEntity InitEntity 1597 = InitializedEntity::InitializeMember(*Field); 1598 InitializationKind InitKind 1599 = InitializationKind::CreateDefault(Constructor->getLocation()); 1600 1601 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1602 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1603 MultiExprArg(*this, 0, 0)); 1604 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1605 if (MemberInit.isInvalid()) { 1606 HadError = true; 1607 continue; 1608 } 1609 1610 // Don't attach synthesized member initializers in a dependent 1611 // context; they'll be regenerated a template instantiation 1612 // time. 1613 if (CurContext->isDependentContext()) 1614 continue; 1615 1616 CXXBaseOrMemberInitializer *Member = 1617 new (Context) CXXBaseOrMemberInitializer(Context, 1618 *Field, SourceLocation(), 1619 SourceLocation(), 1620 MemberInit.takeAs<Expr>(), 1621 SourceLocation()); 1622 1623 AllToInit.push_back(Member); 1624 } 1625 else if (FT->isReferenceType()) { 1626 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1627 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1628 << 0 << (*Field)->getDeclName(); 1629 Diag((*Field)->getLocation(), diag::note_declared_at); 1630 HadError = true; 1631 } 1632 else if (FT.isConstQualified()) { 1633 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1634 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1635 << 1 << (*Field)->getDeclName(); 1636 Diag((*Field)->getLocation(), diag::note_declared_at); 1637 HadError = true; 1638 } 1639 } 1640 1641 NumInitializers = AllToInit.size(); 1642 if (NumInitializers > 0) { 1643 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1644 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1645 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1646 1647 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1648 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) { 1649 CXXBaseOrMemberInitializer *Member = AllToInit[Idx]; 1650 baseOrMemberInitializers[Idx] = Member; 1651 if (!Member->isBaseInitializer()) 1652 continue; 1653 const Type *BaseType = Member->getBaseClass(); 1654 const RecordType *RT = BaseType->getAs<RecordType>(); 1655 if (!RT) 1656 continue; 1657 CXXRecordDecl *BaseClassDecl = 1658 cast<CXXRecordDecl>(RT->getDecl()); 1659 1660 // We don't know if a dependent type will have an implicit destructor. 1661 if (BaseClassDecl->isDependentType()) 1662 continue; 1663 1664 if (BaseClassDecl->hasTrivialDestructor()) 1665 continue; 1666 CXXDestructorDecl *DD = BaseClassDecl->getDestructor(Context); 1667 MarkDeclarationReferenced(Constructor->getLocation(), DD); 1668 } 1669 } 1670 1671 return HadError; 1672} 1673 1674static void *GetKeyForTopLevelField(FieldDecl *Field) { 1675 // For anonymous unions, use the class declaration as the key. 1676 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1677 if (RT->getDecl()->isAnonymousStructOrUnion()) 1678 return static_cast<void *>(RT->getDecl()); 1679 } 1680 return static_cast<void *>(Field); 1681} 1682 1683static void *GetKeyForBase(QualType BaseType) { 1684 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1685 return (void *)RT; 1686 1687 assert(0 && "Unexpected base type!"); 1688 return 0; 1689} 1690 1691static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1692 bool MemberMaybeAnon = false) { 1693 // For fields injected into the class via declaration of an anonymous union, 1694 // use its anonymous union class declaration as the unique key. 1695 if (Member->isMemberInitializer()) { 1696 FieldDecl *Field = Member->getMember(); 1697 1698 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1699 // data member of the class. Data member used in the initializer list is 1700 // in AnonUnionMember field. 1701 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1702 Field = Member->getAnonUnionMember(); 1703 if (Field->getDeclContext()->isRecord()) { 1704 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1705 if (RD->isAnonymousStructOrUnion()) 1706 return static_cast<void *>(RD); 1707 } 1708 return static_cast<void *>(Field); 1709 } 1710 1711 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1712} 1713 1714/// ActOnMemInitializers - Handle the member initializers for a constructor. 1715void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1716 SourceLocation ColonLoc, 1717 MemInitTy **MemInits, unsigned NumMemInits, 1718 bool AnyErrors) { 1719 if (!ConstructorDecl) 1720 return; 1721 1722 AdjustDeclIfTemplate(ConstructorDecl); 1723 1724 CXXConstructorDecl *Constructor 1725 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1726 1727 if (!Constructor) { 1728 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1729 return; 1730 } 1731 1732 if (!Constructor->isDependentContext()) { 1733 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1734 bool err = false; 1735 for (unsigned i = 0; i < NumMemInits; i++) { 1736 CXXBaseOrMemberInitializer *Member = 1737 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1738 void *KeyToMember = GetKeyForMember(Member); 1739 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1740 if (!PrevMember) { 1741 PrevMember = Member; 1742 continue; 1743 } 1744 if (FieldDecl *Field = Member->getMember()) 1745 Diag(Member->getSourceLocation(), 1746 diag::error_multiple_mem_initialization) 1747 << Field->getNameAsString() 1748 << Member->getSourceRange(); 1749 else { 1750 Type *BaseClass = Member->getBaseClass(); 1751 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1752 Diag(Member->getSourceLocation(), 1753 diag::error_multiple_base_initialization) 1754 << QualType(BaseClass, 0) 1755 << Member->getSourceRange(); 1756 } 1757 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1758 << 0; 1759 err = true; 1760 } 1761 1762 if (err) 1763 return; 1764 } 1765 1766 SetBaseOrMemberInitializers(Constructor, 1767 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1768 NumMemInits, false, AnyErrors); 1769 1770 if (Constructor->isDependentContext()) 1771 return; 1772 1773 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1774 Diagnostic::Ignored && 1775 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1776 Diagnostic::Ignored) 1777 return; 1778 1779 // Also issue warning if order of ctor-initializer list does not match order 1780 // of 1) base class declarations and 2) order of non-static data members. 1781 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1782 1783 CXXRecordDecl *ClassDecl 1784 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1785 // Push virtual bases before others. 1786 for (CXXRecordDecl::base_class_iterator VBase = 1787 ClassDecl->vbases_begin(), 1788 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1789 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1790 1791 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1792 E = ClassDecl->bases_end(); Base != E; ++Base) { 1793 // Virtuals are alread in the virtual base list and are constructed 1794 // first. 1795 if (Base->isVirtual()) 1796 continue; 1797 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1798 } 1799 1800 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1801 E = ClassDecl->field_end(); Field != E; ++Field) 1802 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1803 1804 int Last = AllBaseOrMembers.size(); 1805 int curIndex = 0; 1806 CXXBaseOrMemberInitializer *PrevMember = 0; 1807 for (unsigned i = 0; i < NumMemInits; i++) { 1808 CXXBaseOrMemberInitializer *Member = 1809 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1810 void *MemberInCtorList = GetKeyForMember(Member, true); 1811 1812 for (; curIndex < Last; curIndex++) 1813 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1814 break; 1815 if (curIndex == Last) { 1816 assert(PrevMember && "Member not in member list?!"); 1817 // Initializer as specified in ctor-initializer list is out of order. 1818 // Issue a warning diagnostic. 1819 if (PrevMember->isBaseInitializer()) { 1820 // Diagnostics is for an initialized base class. 1821 Type *BaseClass = PrevMember->getBaseClass(); 1822 Diag(PrevMember->getSourceLocation(), 1823 diag::warn_base_initialized) 1824 << QualType(BaseClass, 0); 1825 } else { 1826 FieldDecl *Field = PrevMember->getMember(); 1827 Diag(PrevMember->getSourceLocation(), 1828 diag::warn_field_initialized) 1829 << Field->getNameAsString(); 1830 } 1831 // Also the note! 1832 if (FieldDecl *Field = Member->getMember()) 1833 Diag(Member->getSourceLocation(), 1834 diag::note_fieldorbase_initialized_here) << 0 1835 << Field->getNameAsString(); 1836 else { 1837 Type *BaseClass = Member->getBaseClass(); 1838 Diag(Member->getSourceLocation(), 1839 diag::note_fieldorbase_initialized_here) << 1 1840 << QualType(BaseClass, 0); 1841 } 1842 for (curIndex = 0; curIndex < Last; curIndex++) 1843 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1844 break; 1845 } 1846 PrevMember = Member; 1847 } 1848} 1849 1850void 1851Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1852 // Ignore dependent destructors. 1853 if (Destructor->isDependentContext()) 1854 return; 1855 1856 // FIXME: all the access-control diagnostics are positioned on the 1857 // field/base declaration. That's probably good; that said, the 1858 // user might reasonably want to know why the destructor is being 1859 // emitted, and we currently don't say. 1860 1861 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1862 1863 // Non-static data members. 1864 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1865 E = ClassDecl->field_end(); I != E; ++I) { 1866 FieldDecl *Field = *I; 1867 1868 QualType FieldType = Context.getBaseElementType(Field->getType()); 1869 1870 const RecordType* RT = FieldType->getAs<RecordType>(); 1871 if (!RT) 1872 continue; 1873 1874 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1875 if (FieldClassDecl->hasTrivialDestructor()) 1876 continue; 1877 1878 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1879 CheckDestructorAccess(Field->getLocation(), Dtor, 1880 PartialDiagnostic(diag::err_access_dtor_field) 1881 << Field->getDeclName() 1882 << FieldType); 1883 1884 MarkDeclarationReferenced(Destructor->getLocation(), 1885 const_cast<CXXDestructorDecl*>(Dtor)); 1886 } 1887 1888 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1889 1890 // Bases. 1891 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1892 E = ClassDecl->bases_end(); Base != E; ++Base) { 1893 // Bases are always records in a well-formed non-dependent class. 1894 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1895 1896 // Remember direct virtual bases. 1897 if (Base->isVirtual()) 1898 DirectVirtualBases.insert(RT); 1899 1900 // Ignore trivial destructors. 1901 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1902 if (BaseClassDecl->hasTrivialDestructor()) 1903 continue; 1904 1905 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1906 1907 // FIXME: caret should be on the start of the class name 1908 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1909 PartialDiagnostic(diag::err_access_dtor_base) 1910 << Base->getType() 1911 << Base->getSourceRange()); 1912 1913 MarkDeclarationReferenced(Destructor->getLocation(), 1914 const_cast<CXXDestructorDecl*>(Dtor)); 1915 } 1916 1917 // Virtual bases. 1918 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1919 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1920 1921 // Bases are always records in a well-formed non-dependent class. 1922 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1923 1924 // Ignore direct virtual bases. 1925 if (DirectVirtualBases.count(RT)) 1926 continue; 1927 1928 // Ignore trivial destructors. 1929 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1930 if (BaseClassDecl->hasTrivialDestructor()) 1931 continue; 1932 1933 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1934 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1935 PartialDiagnostic(diag::err_access_dtor_vbase) 1936 << VBase->getType()); 1937 1938 MarkDeclarationReferenced(Destructor->getLocation(), 1939 const_cast<CXXDestructorDecl*>(Dtor)); 1940 } 1941} 1942 1943void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1944 if (!CDtorDecl) 1945 return; 1946 1947 AdjustDeclIfTemplate(CDtorDecl); 1948 1949 if (CXXConstructorDecl *Constructor 1950 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1951 SetBaseOrMemberInitializers(Constructor, 0, 0, false, false); 1952} 1953 1954namespace { 1955 /// PureVirtualMethodCollector - traverses a class and its superclasses 1956 /// and determines if it has any pure virtual methods. 1957 class PureVirtualMethodCollector { 1958 ASTContext &Context; 1959 1960 public: 1961 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1962 1963 private: 1964 MethodList Methods; 1965 1966 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1967 1968 public: 1969 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1970 : Context(Ctx) { 1971 1972 MethodList List; 1973 Collect(RD, List); 1974 1975 // Copy the temporary list to methods, and make sure to ignore any 1976 // null entries. 1977 for (size_t i = 0, e = List.size(); i != e; ++i) { 1978 if (List[i]) 1979 Methods.push_back(List[i]); 1980 } 1981 } 1982 1983 bool empty() const { return Methods.empty(); } 1984 1985 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1986 MethodList::const_iterator methods_end() { return Methods.end(); } 1987 }; 1988 1989 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1990 MethodList& Methods) { 1991 // First, collect the pure virtual methods for the base classes. 1992 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1993 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1994 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1995 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1996 if (BaseDecl && BaseDecl->isAbstract()) 1997 Collect(BaseDecl, Methods); 1998 } 1999 } 2000 2001 // Next, zero out any pure virtual methods that this class overrides. 2002 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 2003 2004 MethodSetTy OverriddenMethods; 2005 size_t MethodsSize = Methods.size(); 2006 2007 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 2008 i != e; ++i) { 2009 // Traverse the record, looking for methods. 2010 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 2011 // If the method is pure virtual, add it to the methods vector. 2012 if (MD->isPure()) 2013 Methods.push_back(MD); 2014 2015 // Record all the overridden methods in our set. 2016 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2017 E = MD->end_overridden_methods(); I != E; ++I) { 2018 // Keep track of the overridden methods. 2019 OverriddenMethods.insert(*I); 2020 } 2021 } 2022 } 2023 2024 // Now go through the methods and zero out all the ones we know are 2025 // overridden. 2026 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 2027 if (OverriddenMethods.count(Methods[i])) 2028 Methods[i] = 0; 2029 } 2030 2031 } 2032} 2033 2034 2035bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2036 unsigned DiagID, AbstractDiagSelID SelID, 2037 const CXXRecordDecl *CurrentRD) { 2038 if (SelID == -1) 2039 return RequireNonAbstractType(Loc, T, 2040 PDiag(DiagID), CurrentRD); 2041 else 2042 return RequireNonAbstractType(Loc, T, 2043 PDiag(DiagID) << SelID, CurrentRD); 2044} 2045 2046bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2047 const PartialDiagnostic &PD, 2048 const CXXRecordDecl *CurrentRD) { 2049 if (!getLangOptions().CPlusPlus) 2050 return false; 2051 2052 if (const ArrayType *AT = Context.getAsArrayType(T)) 2053 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2054 CurrentRD); 2055 2056 if (const PointerType *PT = T->getAs<PointerType>()) { 2057 // Find the innermost pointer type. 2058 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2059 PT = T; 2060 2061 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2062 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2063 } 2064 2065 const RecordType *RT = T->getAs<RecordType>(); 2066 if (!RT) 2067 return false; 2068 2069 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2070 2071 if (CurrentRD && CurrentRD != RD) 2072 return false; 2073 2074 // FIXME: is this reasonable? It matches current behavior, but.... 2075 if (!RD->getDefinition()) 2076 return false; 2077 2078 if (!RD->isAbstract()) 2079 return false; 2080 2081 Diag(Loc, PD) << RD->getDeclName(); 2082 2083 // Check if we've already emitted the list of pure virtual functions for this 2084 // class. 2085 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2086 return true; 2087 2088 PureVirtualMethodCollector Collector(Context, RD); 2089 2090 for (PureVirtualMethodCollector::MethodList::const_iterator I = 2091 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 2092 const CXXMethodDecl *MD = *I; 2093 2094 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 2095 MD->getDeclName(); 2096 } 2097 2098 if (!PureVirtualClassDiagSet) 2099 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2100 PureVirtualClassDiagSet->insert(RD); 2101 2102 return true; 2103} 2104 2105namespace { 2106 class AbstractClassUsageDiagnoser 2107 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2108 Sema &SemaRef; 2109 CXXRecordDecl *AbstractClass; 2110 2111 bool VisitDeclContext(const DeclContext *DC) { 2112 bool Invalid = false; 2113 2114 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2115 E = DC->decls_end(); I != E; ++I) 2116 Invalid |= Visit(*I); 2117 2118 return Invalid; 2119 } 2120 2121 public: 2122 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2123 : SemaRef(SemaRef), AbstractClass(ac) { 2124 Visit(SemaRef.Context.getTranslationUnitDecl()); 2125 } 2126 2127 bool VisitFunctionDecl(const FunctionDecl *FD) { 2128 if (FD->isThisDeclarationADefinition()) { 2129 // No need to do the check if we're in a definition, because it requires 2130 // that the return/param types are complete. 2131 // because that requires 2132 return VisitDeclContext(FD); 2133 } 2134 2135 // Check the return type. 2136 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2137 bool Invalid = 2138 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2139 diag::err_abstract_type_in_decl, 2140 Sema::AbstractReturnType, 2141 AbstractClass); 2142 2143 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2144 E = FD->param_end(); I != E; ++I) { 2145 const ParmVarDecl *VD = *I; 2146 Invalid |= 2147 SemaRef.RequireNonAbstractType(VD->getLocation(), 2148 VD->getOriginalType(), 2149 diag::err_abstract_type_in_decl, 2150 Sema::AbstractParamType, 2151 AbstractClass); 2152 } 2153 2154 return Invalid; 2155 } 2156 2157 bool VisitDecl(const Decl* D) { 2158 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2159 return VisitDeclContext(DC); 2160 2161 return false; 2162 } 2163 }; 2164} 2165 2166/// \brief Perform semantic checks on a class definition that has been 2167/// completing, introducing implicitly-declared members, checking for 2168/// abstract types, etc. 2169void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2170 if (!Record || Record->isInvalidDecl()) 2171 return; 2172 2173 if (!Record->isDependentType()) 2174 AddImplicitlyDeclaredMembersToClass(Record); 2175 2176 if (Record->isInvalidDecl()) 2177 return; 2178 2179 // Set access bits correctly on the directly-declared conversions. 2180 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2181 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2182 Convs->setAccess(I, (*I)->getAccess()); 2183 2184 if (!Record->isAbstract()) { 2185 // Collect all the pure virtual methods and see if this is an abstract 2186 // class after all. 2187 PureVirtualMethodCollector Collector(Context, Record); 2188 if (!Collector.empty()) 2189 Record->setAbstract(true); 2190 } 2191 2192 if (Record->isAbstract()) 2193 (void)AbstractClassUsageDiagnoser(*this, Record); 2194} 2195 2196void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2197 DeclPtrTy TagDecl, 2198 SourceLocation LBrac, 2199 SourceLocation RBrac) { 2200 if (!TagDecl) 2201 return; 2202 2203 AdjustDeclIfTemplate(TagDecl); 2204 2205 ActOnFields(S, RLoc, TagDecl, 2206 (DeclPtrTy*)FieldCollector->getCurFields(), 2207 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2208 2209 CheckCompletedCXXClass( 2210 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2211} 2212 2213/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2214/// special functions, such as the default constructor, copy 2215/// constructor, or destructor, to the given C++ class (C++ 2216/// [special]p1). This routine can only be executed just before the 2217/// definition of the class is complete. 2218void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2219 CanQualType ClassType 2220 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2221 2222 // FIXME: Implicit declarations have exception specifications, which are 2223 // the union of the specifications of the implicitly called functions. 2224 2225 if (!ClassDecl->hasUserDeclaredConstructor()) { 2226 // C++ [class.ctor]p5: 2227 // A default constructor for a class X is a constructor of class X 2228 // that can be called without an argument. If there is no 2229 // user-declared constructor for class X, a default constructor is 2230 // implicitly declared. An implicitly-declared default constructor 2231 // is an inline public member of its class. 2232 DeclarationName Name 2233 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2234 CXXConstructorDecl *DefaultCon = 2235 CXXConstructorDecl::Create(Context, ClassDecl, 2236 ClassDecl->getLocation(), Name, 2237 Context.getFunctionType(Context.VoidTy, 2238 0, 0, false, 0, 2239 /*FIXME*/false, false, 2240 0, 0, false, 2241 CC_Default), 2242 /*TInfo=*/0, 2243 /*isExplicit=*/false, 2244 /*isInline=*/true, 2245 /*isImplicitlyDeclared=*/true); 2246 DefaultCon->setAccess(AS_public); 2247 DefaultCon->setImplicit(); 2248 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2249 ClassDecl->addDecl(DefaultCon); 2250 } 2251 2252 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2253 // C++ [class.copy]p4: 2254 // If the class definition does not explicitly declare a copy 2255 // constructor, one is declared implicitly. 2256 2257 // C++ [class.copy]p5: 2258 // The implicitly-declared copy constructor for a class X will 2259 // have the form 2260 // 2261 // X::X(const X&) 2262 // 2263 // if 2264 bool HasConstCopyConstructor = true; 2265 2266 // -- each direct or virtual base class B of X has a copy 2267 // constructor whose first parameter is of type const B& or 2268 // const volatile B&, and 2269 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2270 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2271 const CXXRecordDecl *BaseClassDecl 2272 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2273 HasConstCopyConstructor 2274 = BaseClassDecl->hasConstCopyConstructor(Context); 2275 } 2276 2277 // -- for all the nonstatic data members of X that are of a 2278 // class type M (or array thereof), each such class type 2279 // has a copy constructor whose first parameter is of type 2280 // const M& or const volatile M&. 2281 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2282 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2283 ++Field) { 2284 QualType FieldType = (*Field)->getType(); 2285 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2286 FieldType = Array->getElementType(); 2287 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2288 const CXXRecordDecl *FieldClassDecl 2289 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2290 HasConstCopyConstructor 2291 = FieldClassDecl->hasConstCopyConstructor(Context); 2292 } 2293 } 2294 2295 // Otherwise, the implicitly declared copy constructor will have 2296 // the form 2297 // 2298 // X::X(X&) 2299 QualType ArgType = ClassType; 2300 if (HasConstCopyConstructor) 2301 ArgType = ArgType.withConst(); 2302 ArgType = Context.getLValueReferenceType(ArgType); 2303 2304 // An implicitly-declared copy constructor is an inline public 2305 // member of its class. 2306 DeclarationName Name 2307 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2308 CXXConstructorDecl *CopyConstructor 2309 = CXXConstructorDecl::Create(Context, ClassDecl, 2310 ClassDecl->getLocation(), Name, 2311 Context.getFunctionType(Context.VoidTy, 2312 &ArgType, 1, 2313 false, 0, 2314 /*FIXME:*/false, 2315 false, 0, 0, false, 2316 CC_Default), 2317 /*TInfo=*/0, 2318 /*isExplicit=*/false, 2319 /*isInline=*/true, 2320 /*isImplicitlyDeclared=*/true); 2321 CopyConstructor->setAccess(AS_public); 2322 CopyConstructor->setImplicit(); 2323 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2324 2325 // Add the parameter to the constructor. 2326 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2327 ClassDecl->getLocation(), 2328 /*IdentifierInfo=*/0, 2329 ArgType, /*TInfo=*/0, 2330 VarDecl::None, 0); 2331 CopyConstructor->setParams(&FromParam, 1); 2332 ClassDecl->addDecl(CopyConstructor); 2333 } 2334 2335 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2336 // Note: The following rules are largely analoguous to the copy 2337 // constructor rules. Note that virtual bases are not taken into account 2338 // for determining the argument type of the operator. Note also that 2339 // operators taking an object instead of a reference are allowed. 2340 // 2341 // C++ [class.copy]p10: 2342 // If the class definition does not explicitly declare a copy 2343 // assignment operator, one is declared implicitly. 2344 // The implicitly-defined copy assignment operator for a class X 2345 // will have the form 2346 // 2347 // X& X::operator=(const X&) 2348 // 2349 // if 2350 bool HasConstCopyAssignment = true; 2351 2352 // -- each direct base class B of X has a copy assignment operator 2353 // whose parameter is of type const B&, const volatile B& or B, 2354 // and 2355 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2356 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2357 assert(!Base->getType()->isDependentType() && 2358 "Cannot generate implicit members for class with dependent bases."); 2359 const CXXRecordDecl *BaseClassDecl 2360 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2361 const CXXMethodDecl *MD = 0; 2362 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2363 MD); 2364 } 2365 2366 // -- for all the nonstatic data members of X that are of a class 2367 // type M (or array thereof), each such class type has a copy 2368 // assignment operator whose parameter is of type const M&, 2369 // const volatile M& or M. 2370 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2371 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2372 ++Field) { 2373 QualType FieldType = (*Field)->getType(); 2374 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2375 FieldType = Array->getElementType(); 2376 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2377 const CXXRecordDecl *FieldClassDecl 2378 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2379 const CXXMethodDecl *MD = 0; 2380 HasConstCopyAssignment 2381 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2382 } 2383 } 2384 2385 // Otherwise, the implicitly declared copy assignment operator will 2386 // have the form 2387 // 2388 // X& X::operator=(X&) 2389 QualType ArgType = ClassType; 2390 QualType RetType = Context.getLValueReferenceType(ArgType); 2391 if (HasConstCopyAssignment) 2392 ArgType = ArgType.withConst(); 2393 ArgType = Context.getLValueReferenceType(ArgType); 2394 2395 // An implicitly-declared copy assignment operator is an inline public 2396 // member of its class. 2397 DeclarationName Name = 2398 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2399 CXXMethodDecl *CopyAssignment = 2400 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2401 Context.getFunctionType(RetType, &ArgType, 1, 2402 false, 0, 2403 /*FIXME:*/false, 2404 false, 0, 0, false, 2405 CC_Default), 2406 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2407 CopyAssignment->setAccess(AS_public); 2408 CopyAssignment->setImplicit(); 2409 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2410 CopyAssignment->setCopyAssignment(true); 2411 2412 // Add the parameter to the operator. 2413 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2414 ClassDecl->getLocation(), 2415 /*IdentifierInfo=*/0, 2416 ArgType, /*TInfo=*/0, 2417 VarDecl::None, 0); 2418 CopyAssignment->setParams(&FromParam, 1); 2419 2420 // Don't call addedAssignmentOperator. There is no way to distinguish an 2421 // implicit from an explicit assignment operator. 2422 ClassDecl->addDecl(CopyAssignment); 2423 AddOverriddenMethods(ClassDecl, CopyAssignment); 2424 } 2425 2426 if (!ClassDecl->hasUserDeclaredDestructor()) { 2427 // C++ [class.dtor]p2: 2428 // If a class has no user-declared destructor, a destructor is 2429 // declared implicitly. An implicitly-declared destructor is an 2430 // inline public member of its class. 2431 QualType Ty = Context.getFunctionType(Context.VoidTy, 2432 0, 0, false, 0, 2433 /*FIXME:*/false, 2434 false, 0, 0, false, 2435 CC_Default); 2436 2437 DeclarationName Name 2438 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2439 CXXDestructorDecl *Destructor 2440 = CXXDestructorDecl::Create(Context, ClassDecl, 2441 ClassDecl->getLocation(), Name, Ty, 2442 /*isInline=*/true, 2443 /*isImplicitlyDeclared=*/true); 2444 Destructor->setAccess(AS_public); 2445 Destructor->setImplicit(); 2446 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2447 ClassDecl->addDecl(Destructor); 2448 2449 // This could be uniqued if it ever proves significant. 2450 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2451 2452 AddOverriddenMethods(ClassDecl, Destructor); 2453 } 2454} 2455 2456void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2457 Decl *D = TemplateD.getAs<Decl>(); 2458 if (!D) 2459 return; 2460 2461 TemplateParameterList *Params = 0; 2462 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2463 Params = Template->getTemplateParameters(); 2464 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2465 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2466 Params = PartialSpec->getTemplateParameters(); 2467 else 2468 return; 2469 2470 for (TemplateParameterList::iterator Param = Params->begin(), 2471 ParamEnd = Params->end(); 2472 Param != ParamEnd; ++Param) { 2473 NamedDecl *Named = cast<NamedDecl>(*Param); 2474 if (Named->getDeclName()) { 2475 S->AddDecl(DeclPtrTy::make(Named)); 2476 IdResolver.AddDecl(Named); 2477 } 2478 } 2479} 2480 2481void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2482 if (!RecordD) return; 2483 AdjustDeclIfTemplate(RecordD); 2484 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2485 PushDeclContext(S, Record); 2486} 2487 2488void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2489 if (!RecordD) return; 2490 PopDeclContext(); 2491} 2492 2493/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2494/// parsing a top-level (non-nested) C++ class, and we are now 2495/// parsing those parts of the given Method declaration that could 2496/// not be parsed earlier (C++ [class.mem]p2), such as default 2497/// arguments. This action should enter the scope of the given 2498/// Method declaration as if we had just parsed the qualified method 2499/// name. However, it should not bring the parameters into scope; 2500/// that will be performed by ActOnDelayedCXXMethodParameter. 2501void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2502} 2503 2504/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2505/// C++ method declaration. We're (re-)introducing the given 2506/// function parameter into scope for use in parsing later parts of 2507/// the method declaration. For example, we could see an 2508/// ActOnParamDefaultArgument event for this parameter. 2509void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2510 if (!ParamD) 2511 return; 2512 2513 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2514 2515 // If this parameter has an unparsed default argument, clear it out 2516 // to make way for the parsed default argument. 2517 if (Param->hasUnparsedDefaultArg()) 2518 Param->setDefaultArg(0); 2519 2520 S->AddDecl(DeclPtrTy::make(Param)); 2521 if (Param->getDeclName()) 2522 IdResolver.AddDecl(Param); 2523} 2524 2525/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2526/// processing the delayed method declaration for Method. The method 2527/// declaration is now considered finished. There may be a separate 2528/// ActOnStartOfFunctionDef action later (not necessarily 2529/// immediately!) for this method, if it was also defined inside the 2530/// class body. 2531void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2532 if (!MethodD) 2533 return; 2534 2535 AdjustDeclIfTemplate(MethodD); 2536 2537 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2538 2539 // Now that we have our default arguments, check the constructor 2540 // again. It could produce additional diagnostics or affect whether 2541 // the class has implicitly-declared destructors, among other 2542 // things. 2543 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2544 CheckConstructor(Constructor); 2545 2546 // Check the default arguments, which we may have added. 2547 if (!Method->isInvalidDecl()) 2548 CheckCXXDefaultArguments(Method); 2549} 2550 2551/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2552/// the well-formedness of the constructor declarator @p D with type @p 2553/// R. If there are any errors in the declarator, this routine will 2554/// emit diagnostics and set the invalid bit to true. In any case, the type 2555/// will be updated to reflect a well-formed type for the constructor and 2556/// returned. 2557QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2558 FunctionDecl::StorageClass &SC) { 2559 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2560 2561 // C++ [class.ctor]p3: 2562 // A constructor shall not be virtual (10.3) or static (9.4). A 2563 // constructor can be invoked for a const, volatile or const 2564 // volatile object. A constructor shall not be declared const, 2565 // volatile, or const volatile (9.3.2). 2566 if (isVirtual) { 2567 if (!D.isInvalidType()) 2568 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2569 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2570 << SourceRange(D.getIdentifierLoc()); 2571 D.setInvalidType(); 2572 } 2573 if (SC == FunctionDecl::Static) { 2574 if (!D.isInvalidType()) 2575 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2576 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2577 << SourceRange(D.getIdentifierLoc()); 2578 D.setInvalidType(); 2579 SC = FunctionDecl::None; 2580 } 2581 2582 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2583 if (FTI.TypeQuals != 0) { 2584 if (FTI.TypeQuals & Qualifiers::Const) 2585 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2586 << "const" << SourceRange(D.getIdentifierLoc()); 2587 if (FTI.TypeQuals & Qualifiers::Volatile) 2588 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2589 << "volatile" << SourceRange(D.getIdentifierLoc()); 2590 if (FTI.TypeQuals & Qualifiers::Restrict) 2591 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2592 << "restrict" << SourceRange(D.getIdentifierLoc()); 2593 } 2594 2595 // Rebuild the function type "R" without any type qualifiers (in 2596 // case any of the errors above fired) and with "void" as the 2597 // return type, since constructors don't have return types. We 2598 // *always* have to do this, because GetTypeForDeclarator will 2599 // put in a result type of "int" when none was specified. 2600 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2601 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2602 Proto->getNumArgs(), 2603 Proto->isVariadic(), 0, 2604 Proto->hasExceptionSpec(), 2605 Proto->hasAnyExceptionSpec(), 2606 Proto->getNumExceptions(), 2607 Proto->exception_begin(), 2608 Proto->getNoReturnAttr(), 2609 Proto->getCallConv()); 2610} 2611 2612/// CheckConstructor - Checks a fully-formed constructor for 2613/// well-formedness, issuing any diagnostics required. Returns true if 2614/// the constructor declarator is invalid. 2615void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2616 CXXRecordDecl *ClassDecl 2617 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2618 if (!ClassDecl) 2619 return Constructor->setInvalidDecl(); 2620 2621 // C++ [class.copy]p3: 2622 // A declaration of a constructor for a class X is ill-formed if 2623 // its first parameter is of type (optionally cv-qualified) X and 2624 // either there are no other parameters or else all other 2625 // parameters have default arguments. 2626 if (!Constructor->isInvalidDecl() && 2627 ((Constructor->getNumParams() == 1) || 2628 (Constructor->getNumParams() > 1 && 2629 Constructor->getParamDecl(1)->hasDefaultArg())) && 2630 Constructor->getTemplateSpecializationKind() 2631 != TSK_ImplicitInstantiation) { 2632 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2633 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2634 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2635 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2636 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2637 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2638 2639 // FIXME: Rather that making the constructor invalid, we should endeavor 2640 // to fix the type. 2641 Constructor->setInvalidDecl(); 2642 } 2643 } 2644 2645 // Notify the class that we've added a constructor. 2646 ClassDecl->addedConstructor(Context, Constructor); 2647} 2648 2649/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2650/// issuing any diagnostics required. Returns true on error. 2651bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2652 CXXRecordDecl *RD = Destructor->getParent(); 2653 2654 if (Destructor->isVirtual()) { 2655 SourceLocation Loc; 2656 2657 if (!Destructor->isImplicit()) 2658 Loc = Destructor->getLocation(); 2659 else 2660 Loc = RD->getLocation(); 2661 2662 // If we have a virtual destructor, look up the deallocation function 2663 FunctionDecl *OperatorDelete = 0; 2664 DeclarationName Name = 2665 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2666 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2667 return true; 2668 2669 Destructor->setOperatorDelete(OperatorDelete); 2670 } 2671 2672 return false; 2673} 2674 2675static inline bool 2676FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2677 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2678 FTI.ArgInfo[0].Param && 2679 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2680} 2681 2682/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2683/// the well-formednes of the destructor declarator @p D with type @p 2684/// R. If there are any errors in the declarator, this routine will 2685/// emit diagnostics and set the declarator to invalid. Even if this happens, 2686/// will be updated to reflect a well-formed type for the destructor and 2687/// returned. 2688QualType Sema::CheckDestructorDeclarator(Declarator &D, 2689 FunctionDecl::StorageClass& SC) { 2690 // C++ [class.dtor]p1: 2691 // [...] A typedef-name that names a class is a class-name 2692 // (7.1.3); however, a typedef-name that names a class shall not 2693 // be used as the identifier in the declarator for a destructor 2694 // declaration. 2695 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2696 if (isa<TypedefType>(DeclaratorType)) { 2697 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2698 << DeclaratorType; 2699 D.setInvalidType(); 2700 } 2701 2702 // C++ [class.dtor]p2: 2703 // A destructor is used to destroy objects of its class type. A 2704 // destructor takes no parameters, and no return type can be 2705 // specified for it (not even void). The address of a destructor 2706 // shall not be taken. A destructor shall not be static. A 2707 // destructor can be invoked for a const, volatile or const 2708 // volatile object. A destructor shall not be declared const, 2709 // volatile or const volatile (9.3.2). 2710 if (SC == FunctionDecl::Static) { 2711 if (!D.isInvalidType()) 2712 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2713 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2714 << SourceRange(D.getIdentifierLoc()); 2715 SC = FunctionDecl::None; 2716 D.setInvalidType(); 2717 } 2718 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2719 // Destructors don't have return types, but the parser will 2720 // happily parse something like: 2721 // 2722 // class X { 2723 // float ~X(); 2724 // }; 2725 // 2726 // The return type will be eliminated later. 2727 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2728 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2729 << SourceRange(D.getIdentifierLoc()); 2730 } 2731 2732 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2733 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2734 if (FTI.TypeQuals & Qualifiers::Const) 2735 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2736 << "const" << SourceRange(D.getIdentifierLoc()); 2737 if (FTI.TypeQuals & Qualifiers::Volatile) 2738 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2739 << "volatile" << SourceRange(D.getIdentifierLoc()); 2740 if (FTI.TypeQuals & Qualifiers::Restrict) 2741 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2742 << "restrict" << SourceRange(D.getIdentifierLoc()); 2743 D.setInvalidType(); 2744 } 2745 2746 // Make sure we don't have any parameters. 2747 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2748 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2749 2750 // Delete the parameters. 2751 FTI.freeArgs(); 2752 D.setInvalidType(); 2753 } 2754 2755 // Make sure the destructor isn't variadic. 2756 if (FTI.isVariadic) { 2757 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2758 D.setInvalidType(); 2759 } 2760 2761 // Rebuild the function type "R" without any type qualifiers or 2762 // parameters (in case any of the errors above fired) and with 2763 // "void" as the return type, since destructors don't have return 2764 // types. We *always* have to do this, because GetTypeForDeclarator 2765 // will put in a result type of "int" when none was specified. 2766 // FIXME: Exceptions! 2767 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2768 false, false, 0, 0, false, CC_Default); 2769} 2770 2771/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2772/// well-formednes of the conversion function declarator @p D with 2773/// type @p R. If there are any errors in the declarator, this routine 2774/// will emit diagnostics and return true. Otherwise, it will return 2775/// false. Either way, the type @p R will be updated to reflect a 2776/// well-formed type for the conversion operator. 2777void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2778 FunctionDecl::StorageClass& SC) { 2779 // C++ [class.conv.fct]p1: 2780 // Neither parameter types nor return type can be specified. The 2781 // type of a conversion function (8.3.5) is "function taking no 2782 // parameter returning conversion-type-id." 2783 if (SC == FunctionDecl::Static) { 2784 if (!D.isInvalidType()) 2785 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2786 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2787 << SourceRange(D.getIdentifierLoc()); 2788 D.setInvalidType(); 2789 SC = FunctionDecl::None; 2790 } 2791 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2792 // Conversion functions don't have return types, but the parser will 2793 // happily parse something like: 2794 // 2795 // class X { 2796 // float operator bool(); 2797 // }; 2798 // 2799 // The return type will be changed later anyway. 2800 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2801 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2802 << SourceRange(D.getIdentifierLoc()); 2803 } 2804 2805 // Make sure we don't have any parameters. 2806 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2807 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2808 2809 // Delete the parameters. 2810 D.getTypeObject(0).Fun.freeArgs(); 2811 D.setInvalidType(); 2812 } 2813 2814 // Make sure the conversion function isn't variadic. 2815 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2816 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2817 D.setInvalidType(); 2818 } 2819 2820 // C++ [class.conv.fct]p4: 2821 // The conversion-type-id shall not represent a function type nor 2822 // an array type. 2823 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2824 if (ConvType->isArrayType()) { 2825 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2826 ConvType = Context.getPointerType(ConvType); 2827 D.setInvalidType(); 2828 } else if (ConvType->isFunctionType()) { 2829 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2830 ConvType = Context.getPointerType(ConvType); 2831 D.setInvalidType(); 2832 } 2833 2834 // Rebuild the function type "R" without any parameters (in case any 2835 // of the errors above fired) and with the conversion type as the 2836 // return type. 2837 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2838 R = Context.getFunctionType(ConvType, 0, 0, false, 2839 Proto->getTypeQuals(), 2840 Proto->hasExceptionSpec(), 2841 Proto->hasAnyExceptionSpec(), 2842 Proto->getNumExceptions(), 2843 Proto->exception_begin(), 2844 Proto->getNoReturnAttr(), 2845 Proto->getCallConv()); 2846 2847 // C++0x explicit conversion operators. 2848 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2849 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2850 diag::warn_explicit_conversion_functions) 2851 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2852} 2853 2854/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2855/// the declaration of the given C++ conversion function. This routine 2856/// is responsible for recording the conversion function in the C++ 2857/// class, if possible. 2858Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2859 assert(Conversion && "Expected to receive a conversion function declaration"); 2860 2861 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2862 2863 // Make sure we aren't redeclaring the conversion function. 2864 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2865 2866 // C++ [class.conv.fct]p1: 2867 // [...] A conversion function is never used to convert a 2868 // (possibly cv-qualified) object to the (possibly cv-qualified) 2869 // same object type (or a reference to it), to a (possibly 2870 // cv-qualified) base class of that type (or a reference to it), 2871 // or to (possibly cv-qualified) void. 2872 // FIXME: Suppress this warning if the conversion function ends up being a 2873 // virtual function that overrides a virtual function in a base class. 2874 QualType ClassType 2875 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2876 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2877 ConvType = ConvTypeRef->getPointeeType(); 2878 if (ConvType->isRecordType()) { 2879 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2880 if (ConvType == ClassType) 2881 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2882 << ClassType; 2883 else if (IsDerivedFrom(ClassType, ConvType)) 2884 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2885 << ClassType << ConvType; 2886 } else if (ConvType->isVoidType()) { 2887 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2888 << ClassType << ConvType; 2889 } 2890 2891 if (Conversion->getPrimaryTemplate()) { 2892 // ignore specializations 2893 } else if (Conversion->getPreviousDeclaration()) { 2894 if (FunctionTemplateDecl *ConversionTemplate 2895 = Conversion->getDescribedFunctionTemplate()) { 2896 if (ClassDecl->replaceConversion( 2897 ConversionTemplate->getPreviousDeclaration(), 2898 ConversionTemplate)) 2899 return DeclPtrTy::make(ConversionTemplate); 2900 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2901 Conversion)) 2902 return DeclPtrTy::make(Conversion); 2903 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2904 } else if (FunctionTemplateDecl *ConversionTemplate 2905 = Conversion->getDescribedFunctionTemplate()) 2906 ClassDecl->addConversionFunction(ConversionTemplate); 2907 else 2908 ClassDecl->addConversionFunction(Conversion); 2909 2910 return DeclPtrTy::make(Conversion); 2911} 2912 2913//===----------------------------------------------------------------------===// 2914// Namespace Handling 2915//===----------------------------------------------------------------------===// 2916 2917/// ActOnStartNamespaceDef - This is called at the start of a namespace 2918/// definition. 2919Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2920 SourceLocation IdentLoc, 2921 IdentifierInfo *II, 2922 SourceLocation LBrace, 2923 AttributeList *AttrList) { 2924 NamespaceDecl *Namespc = 2925 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2926 Namespc->setLBracLoc(LBrace); 2927 2928 Scope *DeclRegionScope = NamespcScope->getParent(); 2929 2930 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2931 2932 if (II) { 2933 // C++ [namespace.def]p2: 2934 // The identifier in an original-namespace-definition shall not have been 2935 // previously defined in the declarative region in which the 2936 // original-namespace-definition appears. The identifier in an 2937 // original-namespace-definition is the name of the namespace. Subsequently 2938 // in that declarative region, it is treated as an original-namespace-name. 2939 2940 NamedDecl *PrevDecl 2941 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2942 ForRedeclaration); 2943 2944 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2945 // This is an extended namespace definition. 2946 // Attach this namespace decl to the chain of extended namespace 2947 // definitions. 2948 OrigNS->setNextNamespace(Namespc); 2949 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2950 2951 // Remove the previous declaration from the scope. 2952 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2953 IdResolver.RemoveDecl(OrigNS); 2954 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2955 } 2956 } else if (PrevDecl) { 2957 // This is an invalid name redefinition. 2958 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2959 << Namespc->getDeclName(); 2960 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2961 Namespc->setInvalidDecl(); 2962 // Continue on to push Namespc as current DeclContext and return it. 2963 } else if (II->isStr("std") && 2964 CurContext->getLookupContext()->isTranslationUnit()) { 2965 // This is the first "real" definition of the namespace "std", so update 2966 // our cache of the "std" namespace to point at this definition. 2967 if (StdNamespace) { 2968 // We had already defined a dummy namespace "std". Link this new 2969 // namespace definition to the dummy namespace "std". 2970 StdNamespace->setNextNamespace(Namespc); 2971 StdNamespace->setLocation(IdentLoc); 2972 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2973 } 2974 2975 // Make our StdNamespace cache point at the first real definition of the 2976 // "std" namespace. 2977 StdNamespace = Namespc; 2978 } 2979 2980 PushOnScopeChains(Namespc, DeclRegionScope); 2981 } else { 2982 // Anonymous namespaces. 2983 assert(Namespc->isAnonymousNamespace()); 2984 CurContext->addDecl(Namespc); 2985 2986 // Link the anonymous namespace into its parent. 2987 NamespaceDecl *PrevDecl; 2988 DeclContext *Parent = CurContext->getLookupContext(); 2989 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2990 PrevDecl = TU->getAnonymousNamespace(); 2991 TU->setAnonymousNamespace(Namespc); 2992 } else { 2993 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2994 PrevDecl = ND->getAnonymousNamespace(); 2995 ND->setAnonymousNamespace(Namespc); 2996 } 2997 2998 // Link the anonymous namespace with its previous declaration. 2999 if (PrevDecl) { 3000 assert(PrevDecl->isAnonymousNamespace()); 3001 assert(!PrevDecl->getNextNamespace()); 3002 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3003 PrevDecl->setNextNamespace(Namespc); 3004 } 3005 3006 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3007 // behaves as if it were replaced by 3008 // namespace unique { /* empty body */ } 3009 // using namespace unique; 3010 // namespace unique { namespace-body } 3011 // where all occurrences of 'unique' in a translation unit are 3012 // replaced by the same identifier and this identifier differs 3013 // from all other identifiers in the entire program. 3014 3015 // We just create the namespace with an empty name and then add an 3016 // implicit using declaration, just like the standard suggests. 3017 // 3018 // CodeGen enforces the "universally unique" aspect by giving all 3019 // declarations semantically contained within an anonymous 3020 // namespace internal linkage. 3021 3022 if (!PrevDecl) { 3023 UsingDirectiveDecl* UD 3024 = UsingDirectiveDecl::Create(Context, CurContext, 3025 /* 'using' */ LBrace, 3026 /* 'namespace' */ SourceLocation(), 3027 /* qualifier */ SourceRange(), 3028 /* NNS */ NULL, 3029 /* identifier */ SourceLocation(), 3030 Namespc, 3031 /* Ancestor */ CurContext); 3032 UD->setImplicit(); 3033 CurContext->addDecl(UD); 3034 } 3035 } 3036 3037 // Although we could have an invalid decl (i.e. the namespace name is a 3038 // redefinition), push it as current DeclContext and try to continue parsing. 3039 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3040 // for the namespace has the declarations that showed up in that particular 3041 // namespace definition. 3042 PushDeclContext(NamespcScope, Namespc); 3043 return DeclPtrTy::make(Namespc); 3044} 3045 3046/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3047/// is a namespace alias, returns the namespace it points to. 3048static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3049 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3050 return AD->getNamespace(); 3051 return dyn_cast_or_null<NamespaceDecl>(D); 3052} 3053 3054/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3055/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3056void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3057 Decl *Dcl = D.getAs<Decl>(); 3058 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3059 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3060 Namespc->setRBracLoc(RBrace); 3061 PopDeclContext(); 3062} 3063 3064Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3065 SourceLocation UsingLoc, 3066 SourceLocation NamespcLoc, 3067 const CXXScopeSpec &SS, 3068 SourceLocation IdentLoc, 3069 IdentifierInfo *NamespcName, 3070 AttributeList *AttrList) { 3071 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3072 assert(NamespcName && "Invalid NamespcName."); 3073 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3074 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3075 3076 UsingDirectiveDecl *UDir = 0; 3077 3078 // Lookup namespace name. 3079 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3080 LookupParsedName(R, S, &SS); 3081 if (R.isAmbiguous()) 3082 return DeclPtrTy(); 3083 3084 if (!R.empty()) { 3085 NamedDecl *Named = R.getFoundDecl(); 3086 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3087 && "expected namespace decl"); 3088 // C++ [namespace.udir]p1: 3089 // A using-directive specifies that the names in the nominated 3090 // namespace can be used in the scope in which the 3091 // using-directive appears after the using-directive. During 3092 // unqualified name lookup (3.4.1), the names appear as if they 3093 // were declared in the nearest enclosing namespace which 3094 // contains both the using-directive and the nominated 3095 // namespace. [Note: in this context, "contains" means "contains 3096 // directly or indirectly". ] 3097 3098 // Find enclosing context containing both using-directive and 3099 // nominated namespace. 3100 NamespaceDecl *NS = getNamespaceDecl(Named); 3101 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3102 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3103 CommonAncestor = CommonAncestor->getParent(); 3104 3105 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3106 SS.getRange(), 3107 (NestedNameSpecifier *)SS.getScopeRep(), 3108 IdentLoc, Named, CommonAncestor); 3109 PushUsingDirective(S, UDir); 3110 } else { 3111 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3112 } 3113 3114 // FIXME: We ignore attributes for now. 3115 delete AttrList; 3116 return DeclPtrTy::make(UDir); 3117} 3118 3119void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3120 // If scope has associated entity, then using directive is at namespace 3121 // or translation unit scope. We add UsingDirectiveDecls, into 3122 // it's lookup structure. 3123 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3124 Ctx->addDecl(UDir); 3125 else 3126 // Otherwise it is block-sope. using-directives will affect lookup 3127 // only to the end of scope. 3128 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3129} 3130 3131 3132Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3133 AccessSpecifier AS, 3134 bool HasUsingKeyword, 3135 SourceLocation UsingLoc, 3136 const CXXScopeSpec &SS, 3137 UnqualifiedId &Name, 3138 AttributeList *AttrList, 3139 bool IsTypeName, 3140 SourceLocation TypenameLoc) { 3141 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3142 3143 switch (Name.getKind()) { 3144 case UnqualifiedId::IK_Identifier: 3145 case UnqualifiedId::IK_OperatorFunctionId: 3146 case UnqualifiedId::IK_LiteralOperatorId: 3147 case UnqualifiedId::IK_ConversionFunctionId: 3148 break; 3149 3150 case UnqualifiedId::IK_ConstructorName: 3151 case UnqualifiedId::IK_ConstructorTemplateId: 3152 // C++0x inherited constructors. 3153 if (getLangOptions().CPlusPlus0x) break; 3154 3155 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3156 << SS.getRange(); 3157 return DeclPtrTy(); 3158 3159 case UnqualifiedId::IK_DestructorName: 3160 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3161 << SS.getRange(); 3162 return DeclPtrTy(); 3163 3164 case UnqualifiedId::IK_TemplateId: 3165 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3166 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3167 return DeclPtrTy(); 3168 } 3169 3170 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3171 if (!TargetName) 3172 return DeclPtrTy(); 3173 3174 // Warn about using declarations. 3175 // TODO: store that the declaration was written without 'using' and 3176 // talk about access decls instead of using decls in the 3177 // diagnostics. 3178 if (!HasUsingKeyword) { 3179 UsingLoc = Name.getSourceRange().getBegin(); 3180 3181 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3182 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3183 "using "); 3184 } 3185 3186 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3187 Name.getSourceRange().getBegin(), 3188 TargetName, AttrList, 3189 /* IsInstantiation */ false, 3190 IsTypeName, TypenameLoc); 3191 if (UD) 3192 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3193 3194 return DeclPtrTy::make(UD); 3195} 3196 3197/// Determines whether to create a using shadow decl for a particular 3198/// decl, given the set of decls existing prior to this using lookup. 3199bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3200 const LookupResult &Previous) { 3201 // Diagnose finding a decl which is not from a base class of the 3202 // current class. We do this now because there are cases where this 3203 // function will silently decide not to build a shadow decl, which 3204 // will pre-empt further diagnostics. 3205 // 3206 // We don't need to do this in C++0x because we do the check once on 3207 // the qualifier. 3208 // 3209 // FIXME: diagnose the following if we care enough: 3210 // struct A { int foo; }; 3211 // struct B : A { using A::foo; }; 3212 // template <class T> struct C : A {}; 3213 // template <class T> struct D : C<T> { using B::foo; } // <--- 3214 // This is invalid (during instantiation) in C++03 because B::foo 3215 // resolves to the using decl in B, which is not a base class of D<T>. 3216 // We can't diagnose it immediately because C<T> is an unknown 3217 // specialization. The UsingShadowDecl in D<T> then points directly 3218 // to A::foo, which will look well-formed when we instantiate. 3219 // The right solution is to not collapse the shadow-decl chain. 3220 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3221 DeclContext *OrigDC = Orig->getDeclContext(); 3222 3223 // Handle enums and anonymous structs. 3224 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3225 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3226 while (OrigRec->isAnonymousStructOrUnion()) 3227 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3228 3229 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3230 if (OrigDC == CurContext) { 3231 Diag(Using->getLocation(), 3232 diag::err_using_decl_nested_name_specifier_is_current_class) 3233 << Using->getNestedNameRange(); 3234 Diag(Orig->getLocation(), diag::note_using_decl_target); 3235 return true; 3236 } 3237 3238 Diag(Using->getNestedNameRange().getBegin(), 3239 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3240 << Using->getTargetNestedNameDecl() 3241 << cast<CXXRecordDecl>(CurContext) 3242 << Using->getNestedNameRange(); 3243 Diag(Orig->getLocation(), diag::note_using_decl_target); 3244 return true; 3245 } 3246 } 3247 3248 if (Previous.empty()) return false; 3249 3250 NamedDecl *Target = Orig; 3251 if (isa<UsingShadowDecl>(Target)) 3252 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3253 3254 // If the target happens to be one of the previous declarations, we 3255 // don't have a conflict. 3256 // 3257 // FIXME: but we might be increasing its access, in which case we 3258 // should redeclare it. 3259 NamedDecl *NonTag = 0, *Tag = 0; 3260 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3261 I != E; ++I) { 3262 NamedDecl *D = (*I)->getUnderlyingDecl(); 3263 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3264 return false; 3265 3266 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3267 } 3268 3269 if (Target->isFunctionOrFunctionTemplate()) { 3270 FunctionDecl *FD; 3271 if (isa<FunctionTemplateDecl>(Target)) 3272 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3273 else 3274 FD = cast<FunctionDecl>(Target); 3275 3276 NamedDecl *OldDecl = 0; 3277 switch (CheckOverload(FD, Previous, OldDecl)) { 3278 case Ovl_Overload: 3279 return false; 3280 3281 case Ovl_NonFunction: 3282 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3283 break; 3284 3285 // We found a decl with the exact signature. 3286 case Ovl_Match: 3287 if (isa<UsingShadowDecl>(OldDecl)) { 3288 // Silently ignore the possible conflict. 3289 return false; 3290 } 3291 3292 // If we're in a record, we want to hide the target, so we 3293 // return true (without a diagnostic) to tell the caller not to 3294 // build a shadow decl. 3295 if (CurContext->isRecord()) 3296 return true; 3297 3298 // If we're not in a record, this is an error. 3299 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3300 break; 3301 } 3302 3303 Diag(Target->getLocation(), diag::note_using_decl_target); 3304 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3305 return true; 3306 } 3307 3308 // Target is not a function. 3309 3310 if (isa<TagDecl>(Target)) { 3311 // No conflict between a tag and a non-tag. 3312 if (!Tag) return false; 3313 3314 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3315 Diag(Target->getLocation(), diag::note_using_decl_target); 3316 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3317 return true; 3318 } 3319 3320 // No conflict between a tag and a non-tag. 3321 if (!NonTag) return false; 3322 3323 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3324 Diag(Target->getLocation(), diag::note_using_decl_target); 3325 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3326 return true; 3327} 3328 3329/// Builds a shadow declaration corresponding to a 'using' declaration. 3330UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3331 UsingDecl *UD, 3332 NamedDecl *Orig) { 3333 3334 // If we resolved to another shadow declaration, just coalesce them. 3335 NamedDecl *Target = Orig; 3336 if (isa<UsingShadowDecl>(Target)) { 3337 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3338 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3339 } 3340 3341 UsingShadowDecl *Shadow 3342 = UsingShadowDecl::Create(Context, CurContext, 3343 UD->getLocation(), UD, Target); 3344 UD->addShadowDecl(Shadow); 3345 3346 if (S) 3347 PushOnScopeChains(Shadow, S); 3348 else 3349 CurContext->addDecl(Shadow); 3350 Shadow->setAccess(UD->getAccess()); 3351 3352 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3353 Shadow->setInvalidDecl(); 3354 3355 return Shadow; 3356} 3357 3358/// Hides a using shadow declaration. This is required by the current 3359/// using-decl implementation when a resolvable using declaration in a 3360/// class is followed by a declaration which would hide or override 3361/// one or more of the using decl's targets; for example: 3362/// 3363/// struct Base { void foo(int); }; 3364/// struct Derived : Base { 3365/// using Base::foo; 3366/// void foo(int); 3367/// }; 3368/// 3369/// The governing language is C++03 [namespace.udecl]p12: 3370/// 3371/// When a using-declaration brings names from a base class into a 3372/// derived class scope, member functions in the derived class 3373/// override and/or hide member functions with the same name and 3374/// parameter types in a base class (rather than conflicting). 3375/// 3376/// There are two ways to implement this: 3377/// (1) optimistically create shadow decls when they're not hidden 3378/// by existing declarations, or 3379/// (2) don't create any shadow decls (or at least don't make them 3380/// visible) until we've fully parsed/instantiated the class. 3381/// The problem with (1) is that we might have to retroactively remove 3382/// a shadow decl, which requires several O(n) operations because the 3383/// decl structures are (very reasonably) not designed for removal. 3384/// (2) avoids this but is very fiddly and phase-dependent. 3385void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3386 // Remove it from the DeclContext... 3387 Shadow->getDeclContext()->removeDecl(Shadow); 3388 3389 // ...and the scope, if applicable... 3390 if (S) { 3391 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3392 IdResolver.RemoveDecl(Shadow); 3393 } 3394 3395 // ...and the using decl. 3396 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3397 3398 // TODO: complain somehow if Shadow was used. It shouldn't 3399 // be possible for this to happen, because 3400} 3401 3402/// Builds a using declaration. 3403/// 3404/// \param IsInstantiation - Whether this call arises from an 3405/// instantiation of an unresolved using declaration. We treat 3406/// the lookup differently for these declarations. 3407NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3408 SourceLocation UsingLoc, 3409 const CXXScopeSpec &SS, 3410 SourceLocation IdentLoc, 3411 DeclarationName Name, 3412 AttributeList *AttrList, 3413 bool IsInstantiation, 3414 bool IsTypeName, 3415 SourceLocation TypenameLoc) { 3416 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3417 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3418 3419 // FIXME: We ignore attributes for now. 3420 delete AttrList; 3421 3422 if (SS.isEmpty()) { 3423 Diag(IdentLoc, diag::err_using_requires_qualname); 3424 return 0; 3425 } 3426 3427 // Do the redeclaration lookup in the current scope. 3428 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3429 ForRedeclaration); 3430 Previous.setHideTags(false); 3431 if (S) { 3432 LookupName(Previous, S); 3433 3434 // It is really dumb that we have to do this. 3435 LookupResult::Filter F = Previous.makeFilter(); 3436 while (F.hasNext()) { 3437 NamedDecl *D = F.next(); 3438 if (!isDeclInScope(D, CurContext, S)) 3439 F.erase(); 3440 } 3441 F.done(); 3442 } else { 3443 assert(IsInstantiation && "no scope in non-instantiation"); 3444 assert(CurContext->isRecord() && "scope not record in instantiation"); 3445 LookupQualifiedName(Previous, CurContext); 3446 } 3447 3448 NestedNameSpecifier *NNS = 3449 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3450 3451 // Check for invalid redeclarations. 3452 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3453 return 0; 3454 3455 // Check for bad qualifiers. 3456 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3457 return 0; 3458 3459 DeclContext *LookupContext = computeDeclContext(SS); 3460 NamedDecl *D; 3461 if (!LookupContext) { 3462 if (IsTypeName) { 3463 // FIXME: not all declaration name kinds are legal here 3464 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3465 UsingLoc, TypenameLoc, 3466 SS.getRange(), NNS, 3467 IdentLoc, Name); 3468 } else { 3469 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3470 UsingLoc, SS.getRange(), NNS, 3471 IdentLoc, Name); 3472 } 3473 } else { 3474 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3475 SS.getRange(), UsingLoc, NNS, Name, 3476 IsTypeName); 3477 } 3478 D->setAccess(AS); 3479 CurContext->addDecl(D); 3480 3481 if (!LookupContext) return D; 3482 UsingDecl *UD = cast<UsingDecl>(D); 3483 3484 if (RequireCompleteDeclContext(SS)) { 3485 UD->setInvalidDecl(); 3486 return UD; 3487 } 3488 3489 // Look up the target name. 3490 3491 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3492 3493 // Unlike most lookups, we don't always want to hide tag 3494 // declarations: tag names are visible through the using declaration 3495 // even if hidden by ordinary names, *except* in a dependent context 3496 // where it's important for the sanity of two-phase lookup. 3497 if (!IsInstantiation) 3498 R.setHideTags(false); 3499 3500 LookupQualifiedName(R, LookupContext); 3501 3502 if (R.empty()) { 3503 Diag(IdentLoc, diag::err_no_member) 3504 << Name << LookupContext << SS.getRange(); 3505 UD->setInvalidDecl(); 3506 return UD; 3507 } 3508 3509 if (R.isAmbiguous()) { 3510 UD->setInvalidDecl(); 3511 return UD; 3512 } 3513 3514 if (IsTypeName) { 3515 // If we asked for a typename and got a non-type decl, error out. 3516 if (!R.getAsSingle<TypeDecl>()) { 3517 Diag(IdentLoc, diag::err_using_typename_non_type); 3518 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3519 Diag((*I)->getUnderlyingDecl()->getLocation(), 3520 diag::note_using_decl_target); 3521 UD->setInvalidDecl(); 3522 return UD; 3523 } 3524 } else { 3525 // If we asked for a non-typename and we got a type, error out, 3526 // but only if this is an instantiation of an unresolved using 3527 // decl. Otherwise just silently find the type name. 3528 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3529 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3530 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3531 UD->setInvalidDecl(); 3532 return UD; 3533 } 3534 } 3535 3536 // C++0x N2914 [namespace.udecl]p6: 3537 // A using-declaration shall not name a namespace. 3538 if (R.getAsSingle<NamespaceDecl>()) { 3539 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3540 << SS.getRange(); 3541 UD->setInvalidDecl(); 3542 return UD; 3543 } 3544 3545 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3546 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3547 BuildUsingShadowDecl(S, UD, *I); 3548 } 3549 3550 return UD; 3551} 3552 3553/// Checks that the given using declaration is not an invalid 3554/// redeclaration. Note that this is checking only for the using decl 3555/// itself, not for any ill-formedness among the UsingShadowDecls. 3556bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3557 bool isTypeName, 3558 const CXXScopeSpec &SS, 3559 SourceLocation NameLoc, 3560 const LookupResult &Prev) { 3561 // C++03 [namespace.udecl]p8: 3562 // C++0x [namespace.udecl]p10: 3563 // A using-declaration is a declaration and can therefore be used 3564 // repeatedly where (and only where) multiple declarations are 3565 // allowed. 3566 // That's only in file contexts. 3567 if (CurContext->getLookupContext()->isFileContext()) 3568 return false; 3569 3570 NestedNameSpecifier *Qual 3571 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3572 3573 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3574 NamedDecl *D = *I; 3575 3576 bool DTypename; 3577 NestedNameSpecifier *DQual; 3578 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3579 DTypename = UD->isTypeName(); 3580 DQual = UD->getTargetNestedNameDecl(); 3581 } else if (UnresolvedUsingValueDecl *UD 3582 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3583 DTypename = false; 3584 DQual = UD->getTargetNestedNameSpecifier(); 3585 } else if (UnresolvedUsingTypenameDecl *UD 3586 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3587 DTypename = true; 3588 DQual = UD->getTargetNestedNameSpecifier(); 3589 } else continue; 3590 3591 // using decls differ if one says 'typename' and the other doesn't. 3592 // FIXME: non-dependent using decls? 3593 if (isTypeName != DTypename) continue; 3594 3595 // using decls differ if they name different scopes (but note that 3596 // template instantiation can cause this check to trigger when it 3597 // didn't before instantiation). 3598 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3599 Context.getCanonicalNestedNameSpecifier(DQual)) 3600 continue; 3601 3602 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3603 Diag(D->getLocation(), diag::note_using_decl) << 1; 3604 return true; 3605 } 3606 3607 return false; 3608} 3609 3610 3611/// Checks that the given nested-name qualifier used in a using decl 3612/// in the current context is appropriately related to the current 3613/// scope. If an error is found, diagnoses it and returns true. 3614bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3615 const CXXScopeSpec &SS, 3616 SourceLocation NameLoc) { 3617 DeclContext *NamedContext = computeDeclContext(SS); 3618 3619 if (!CurContext->isRecord()) { 3620 // C++03 [namespace.udecl]p3: 3621 // C++0x [namespace.udecl]p8: 3622 // A using-declaration for a class member shall be a member-declaration. 3623 3624 // If we weren't able to compute a valid scope, it must be a 3625 // dependent class scope. 3626 if (!NamedContext || NamedContext->isRecord()) { 3627 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3628 << SS.getRange(); 3629 return true; 3630 } 3631 3632 // Otherwise, everything is known to be fine. 3633 return false; 3634 } 3635 3636 // The current scope is a record. 3637 3638 // If the named context is dependent, we can't decide much. 3639 if (!NamedContext) { 3640 // FIXME: in C++0x, we can diagnose if we can prove that the 3641 // nested-name-specifier does not refer to a base class, which is 3642 // still possible in some cases. 3643 3644 // Otherwise we have to conservatively report that things might be 3645 // okay. 3646 return false; 3647 } 3648 3649 if (!NamedContext->isRecord()) { 3650 // Ideally this would point at the last name in the specifier, 3651 // but we don't have that level of source info. 3652 Diag(SS.getRange().getBegin(), 3653 diag::err_using_decl_nested_name_specifier_is_not_class) 3654 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3655 return true; 3656 } 3657 3658 if (getLangOptions().CPlusPlus0x) { 3659 // C++0x [namespace.udecl]p3: 3660 // In a using-declaration used as a member-declaration, the 3661 // nested-name-specifier shall name a base class of the class 3662 // being defined. 3663 3664 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3665 cast<CXXRecordDecl>(NamedContext))) { 3666 if (CurContext == NamedContext) { 3667 Diag(NameLoc, 3668 diag::err_using_decl_nested_name_specifier_is_current_class) 3669 << SS.getRange(); 3670 return true; 3671 } 3672 3673 Diag(SS.getRange().getBegin(), 3674 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3675 << (NestedNameSpecifier*) SS.getScopeRep() 3676 << cast<CXXRecordDecl>(CurContext) 3677 << SS.getRange(); 3678 return true; 3679 } 3680 3681 return false; 3682 } 3683 3684 // C++03 [namespace.udecl]p4: 3685 // A using-declaration used as a member-declaration shall refer 3686 // to a member of a base class of the class being defined [etc.]. 3687 3688 // Salient point: SS doesn't have to name a base class as long as 3689 // lookup only finds members from base classes. Therefore we can 3690 // diagnose here only if we can prove that that can't happen, 3691 // i.e. if the class hierarchies provably don't intersect. 3692 3693 // TODO: it would be nice if "definitely valid" results were cached 3694 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3695 // need to be repeated. 3696 3697 struct UserData { 3698 llvm::DenseSet<const CXXRecordDecl*> Bases; 3699 3700 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3701 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3702 Data->Bases.insert(Base); 3703 return true; 3704 } 3705 3706 bool hasDependentBases(const CXXRecordDecl *Class) { 3707 return !Class->forallBases(collect, this); 3708 } 3709 3710 /// Returns true if the base is dependent or is one of the 3711 /// accumulated base classes. 3712 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3713 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3714 return !Data->Bases.count(Base); 3715 } 3716 3717 bool mightShareBases(const CXXRecordDecl *Class) { 3718 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3719 } 3720 }; 3721 3722 UserData Data; 3723 3724 // Returns false if we find a dependent base. 3725 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3726 return false; 3727 3728 // Returns false if the class has a dependent base or if it or one 3729 // of its bases is present in the base set of the current context. 3730 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3731 return false; 3732 3733 Diag(SS.getRange().getBegin(), 3734 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3735 << (NestedNameSpecifier*) SS.getScopeRep() 3736 << cast<CXXRecordDecl>(CurContext) 3737 << SS.getRange(); 3738 3739 return true; 3740} 3741 3742Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3743 SourceLocation NamespaceLoc, 3744 SourceLocation AliasLoc, 3745 IdentifierInfo *Alias, 3746 const CXXScopeSpec &SS, 3747 SourceLocation IdentLoc, 3748 IdentifierInfo *Ident) { 3749 3750 // Lookup the namespace name. 3751 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3752 LookupParsedName(R, S, &SS); 3753 3754 // Check if we have a previous declaration with the same name. 3755 if (NamedDecl *PrevDecl 3756 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3757 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3758 // We already have an alias with the same name that points to the same 3759 // namespace, so don't create a new one. 3760 if (!R.isAmbiguous() && !R.empty() && 3761 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3762 return DeclPtrTy(); 3763 } 3764 3765 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3766 diag::err_redefinition_different_kind; 3767 Diag(AliasLoc, DiagID) << Alias; 3768 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3769 return DeclPtrTy(); 3770 } 3771 3772 if (R.isAmbiguous()) 3773 return DeclPtrTy(); 3774 3775 if (R.empty()) { 3776 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3777 return DeclPtrTy(); 3778 } 3779 3780 NamespaceAliasDecl *AliasDecl = 3781 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3782 Alias, SS.getRange(), 3783 (NestedNameSpecifier *)SS.getScopeRep(), 3784 IdentLoc, R.getFoundDecl()); 3785 3786 PushOnScopeChains(AliasDecl, S); 3787 return DeclPtrTy::make(AliasDecl); 3788} 3789 3790void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3791 CXXConstructorDecl *Constructor) { 3792 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3793 !Constructor->isUsed()) && 3794 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3795 3796 CXXRecordDecl *ClassDecl 3797 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3798 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3799 3800 DeclContext *PreviousContext = CurContext; 3801 CurContext = Constructor; 3802 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true, false)) { 3803 Diag(CurrentLocation, diag::note_member_synthesized_at) 3804 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3805 Constructor->setInvalidDecl(); 3806 } else { 3807 Constructor->setUsed(); 3808 } 3809 CurContext = PreviousContext; 3810} 3811 3812void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3813 CXXDestructorDecl *Destructor) { 3814 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3815 "DefineImplicitDestructor - call it for implicit default dtor"); 3816 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3817 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3818 3819 DeclContext *PreviousContext = CurContext; 3820 CurContext = Destructor; 3821 3822 MarkBaseAndMemberDestructorsReferenced(Destructor); 3823 3824 // FIXME: If CheckDestructor fails, we should emit a note about where the 3825 // implicit destructor was needed. 3826 if (CheckDestructor(Destructor)) { 3827 Diag(CurrentLocation, diag::note_member_synthesized_at) 3828 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3829 3830 Destructor->setInvalidDecl(); 3831 CurContext = PreviousContext; 3832 3833 return; 3834 } 3835 CurContext = PreviousContext; 3836 3837 Destructor->setUsed(); 3838} 3839 3840void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3841 CXXMethodDecl *MethodDecl) { 3842 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3843 MethodDecl->getOverloadedOperator() == OO_Equal && 3844 !MethodDecl->isUsed()) && 3845 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3846 3847 CXXRecordDecl *ClassDecl 3848 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3849 3850 DeclContext *PreviousContext = CurContext; 3851 CurContext = MethodDecl; 3852 3853 // C++[class.copy] p12 3854 // Before the implicitly-declared copy assignment operator for a class is 3855 // implicitly defined, all implicitly-declared copy assignment operators 3856 // for its direct base classes and its nonstatic data members shall have 3857 // been implicitly defined. 3858 bool err = false; 3859 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3860 E = ClassDecl->bases_end(); Base != E; ++Base) { 3861 CXXRecordDecl *BaseClassDecl 3862 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3863 if (CXXMethodDecl *BaseAssignOpMethod = 3864 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3865 BaseClassDecl)) { 3866 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3867 BaseAssignOpMethod, 3868 PartialDiagnostic(diag::err_access_assign_base) 3869 << Base->getType()); 3870 3871 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3872 } 3873 } 3874 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3875 E = ClassDecl->field_end(); Field != E; ++Field) { 3876 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3877 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3878 FieldType = Array->getElementType(); 3879 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3880 CXXRecordDecl *FieldClassDecl 3881 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3882 if (CXXMethodDecl *FieldAssignOpMethod = 3883 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3884 FieldClassDecl)) { 3885 CheckDirectMemberAccess(Field->getLocation(), 3886 FieldAssignOpMethod, 3887 PartialDiagnostic(diag::err_access_assign_field) 3888 << Field->getDeclName() << Field->getType()); 3889 3890 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3891 } 3892 } else if (FieldType->isReferenceType()) { 3893 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3894 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3895 Diag(Field->getLocation(), diag::note_declared_at); 3896 Diag(CurrentLocation, diag::note_first_required_here); 3897 err = true; 3898 } else if (FieldType.isConstQualified()) { 3899 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3900 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3901 Diag(Field->getLocation(), diag::note_declared_at); 3902 Diag(CurrentLocation, diag::note_first_required_here); 3903 err = true; 3904 } 3905 } 3906 if (!err) 3907 MethodDecl->setUsed(); 3908 3909 CurContext = PreviousContext; 3910} 3911 3912CXXMethodDecl * 3913Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3914 ParmVarDecl *ParmDecl, 3915 CXXRecordDecl *ClassDecl) { 3916 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3917 QualType RHSType(LHSType); 3918 // If class's assignment operator argument is const/volatile qualified, 3919 // look for operator = (const/volatile B&). Otherwise, look for 3920 // operator = (B&). 3921 RHSType = Context.getCVRQualifiedType(RHSType, 3922 ParmDecl->getType().getCVRQualifiers()); 3923 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3924 LHSType, 3925 SourceLocation())); 3926 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3927 RHSType, 3928 CurrentLocation)); 3929 Expr *Args[2] = { &*LHS, &*RHS }; 3930 OverloadCandidateSet CandidateSet(CurrentLocation); 3931 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3932 CandidateSet); 3933 OverloadCandidateSet::iterator Best; 3934 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3935 return cast<CXXMethodDecl>(Best->Function); 3936 assert(false && 3937 "getAssignOperatorMethod - copy assignment operator method not found"); 3938 return 0; 3939} 3940 3941void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3942 CXXConstructorDecl *CopyConstructor, 3943 unsigned TypeQuals) { 3944 assert((CopyConstructor->isImplicit() && 3945 CopyConstructor->isCopyConstructor(TypeQuals) && 3946 !CopyConstructor->isUsed()) && 3947 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3948 3949 CXXRecordDecl *ClassDecl 3950 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3951 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3952 3953 DeclContext *PreviousContext = CurContext; 3954 CurContext = CopyConstructor; 3955 3956 // C++ [class.copy] p209 3957 // Before the implicitly-declared copy constructor for a class is 3958 // implicitly defined, all the implicitly-declared copy constructors 3959 // for its base class and its non-static data members shall have been 3960 // implicitly defined. 3961 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3962 Base != ClassDecl->bases_end(); ++Base) { 3963 CXXRecordDecl *BaseClassDecl 3964 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3965 if (CXXConstructorDecl *BaseCopyCtor = 3966 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3967 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3968 BaseCopyCtor, 3969 PartialDiagnostic(diag::err_access_copy_base) 3970 << Base->getType()); 3971 3972 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3973 } 3974 } 3975 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3976 FieldEnd = ClassDecl->field_end(); 3977 Field != FieldEnd; ++Field) { 3978 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3979 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3980 FieldType = Array->getElementType(); 3981 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3982 CXXRecordDecl *FieldClassDecl 3983 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3984 if (CXXConstructorDecl *FieldCopyCtor = 3985 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 3986 CheckDirectMemberAccess(Field->getLocation(), 3987 FieldCopyCtor, 3988 PartialDiagnostic(diag::err_access_copy_field) 3989 << Field->getDeclName() << Field->getType()); 3990 3991 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3992 } 3993 } 3994 } 3995 CopyConstructor->setUsed(); 3996 3997 CurContext = PreviousContext; 3998} 3999 4000Sema::OwningExprResult 4001Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4002 CXXConstructorDecl *Constructor, 4003 MultiExprArg ExprArgs, 4004 bool RequiresZeroInit, 4005 bool BaseInitialization) { 4006 bool Elidable = false; 4007 4008 // C++ [class.copy]p15: 4009 // Whenever a temporary class object is copied using a copy constructor, and 4010 // this object and the copy have the same cv-unqualified type, an 4011 // implementation is permitted to treat the original and the copy as two 4012 // different ways of referring to the same object and not perform a copy at 4013 // all, even if the class copy constructor or destructor have side effects. 4014 4015 // FIXME: Is this enough? 4016 if (Constructor->isCopyConstructor()) { 4017 Expr *E = ((Expr **)ExprArgs.get())[0]; 4018 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4019 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4020 E = ICE->getSubExpr(); 4021 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 4022 E = FCE->getSubExpr(); 4023 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 4024 E = BE->getSubExpr(); 4025 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4026 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4027 E = ICE->getSubExpr(); 4028 4029 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 4030 Elidable = !CE->getCallReturnType()->isReferenceType(); 4031 else if (isa<CXXTemporaryObjectExpr>(E)) 4032 Elidable = true; 4033 else if (isa<CXXConstructExpr>(E)) 4034 Elidable = true; 4035 } 4036 4037 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4038 Elidable, move(ExprArgs), RequiresZeroInit, 4039 BaseInitialization); 4040} 4041 4042/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4043/// including handling of its default argument expressions. 4044Sema::OwningExprResult 4045Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4046 CXXConstructorDecl *Constructor, bool Elidable, 4047 MultiExprArg ExprArgs, 4048 bool RequiresZeroInit, 4049 bool BaseInitialization) { 4050 unsigned NumExprs = ExprArgs.size(); 4051 Expr **Exprs = (Expr **)ExprArgs.release(); 4052 4053 MarkDeclarationReferenced(ConstructLoc, Constructor); 4054 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4055 Constructor, Elidable, Exprs, NumExprs, 4056 RequiresZeroInit, BaseInitialization)); 4057} 4058 4059bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4060 CXXConstructorDecl *Constructor, 4061 MultiExprArg Exprs) { 4062 OwningExprResult TempResult = 4063 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4064 move(Exprs)); 4065 if (TempResult.isInvalid()) 4066 return true; 4067 4068 Expr *Temp = TempResult.takeAs<Expr>(); 4069 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4070 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4071 VD->setInit(Temp); 4072 4073 return false; 4074} 4075 4076void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4077 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4078 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4079 !ClassDecl->hasTrivialDestructor()) { 4080 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4081 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4082 CheckDestructorAccess(VD->getLocation(), Destructor, 4083 PartialDiagnostic(diag::err_access_dtor_var) 4084 << VD->getDeclName() 4085 << VD->getType()); 4086 } 4087} 4088 4089/// AddCXXDirectInitializerToDecl - This action is called immediately after 4090/// ActOnDeclarator, when a C++ direct initializer is present. 4091/// e.g: "int x(1);" 4092void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4093 SourceLocation LParenLoc, 4094 MultiExprArg Exprs, 4095 SourceLocation *CommaLocs, 4096 SourceLocation RParenLoc) { 4097 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4098 Decl *RealDecl = Dcl.getAs<Decl>(); 4099 4100 // If there is no declaration, there was an error parsing it. Just ignore 4101 // the initializer. 4102 if (RealDecl == 0) 4103 return; 4104 4105 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4106 if (!VDecl) { 4107 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4108 RealDecl->setInvalidDecl(); 4109 return; 4110 } 4111 4112 // We will represent direct-initialization similarly to copy-initialization: 4113 // int x(1); -as-> int x = 1; 4114 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4115 // 4116 // Clients that want to distinguish between the two forms, can check for 4117 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4118 // A major benefit is that clients that don't particularly care about which 4119 // exactly form was it (like the CodeGen) can handle both cases without 4120 // special case code. 4121 4122 // C++ 8.5p11: 4123 // The form of initialization (using parentheses or '=') is generally 4124 // insignificant, but does matter when the entity being initialized has a 4125 // class type. 4126 QualType DeclInitType = VDecl->getType(); 4127 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4128 DeclInitType = Context.getBaseElementType(Array); 4129 4130 if (!VDecl->getType()->isDependentType() && 4131 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4132 diag::err_typecheck_decl_incomplete_type)) { 4133 VDecl->setInvalidDecl(); 4134 return; 4135 } 4136 4137 // The variable can not have an abstract class type. 4138 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4139 diag::err_abstract_type_in_decl, 4140 AbstractVariableType)) 4141 VDecl->setInvalidDecl(); 4142 4143 const VarDecl *Def; 4144 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4145 Diag(VDecl->getLocation(), diag::err_redefinition) 4146 << VDecl->getDeclName(); 4147 Diag(Def->getLocation(), diag::note_previous_definition); 4148 VDecl->setInvalidDecl(); 4149 return; 4150 } 4151 4152 // If either the declaration has a dependent type or if any of the 4153 // expressions is type-dependent, we represent the initialization 4154 // via a ParenListExpr for later use during template instantiation. 4155 if (VDecl->getType()->isDependentType() || 4156 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4157 // Let clients know that initialization was done with a direct initializer. 4158 VDecl->setCXXDirectInitializer(true); 4159 4160 // Store the initialization expressions as a ParenListExpr. 4161 unsigned NumExprs = Exprs.size(); 4162 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4163 (Expr **)Exprs.release(), 4164 NumExprs, RParenLoc)); 4165 return; 4166 } 4167 4168 // Capture the variable that is being initialized and the style of 4169 // initialization. 4170 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4171 4172 // FIXME: Poor source location information. 4173 InitializationKind Kind 4174 = InitializationKind::CreateDirect(VDecl->getLocation(), 4175 LParenLoc, RParenLoc); 4176 4177 InitializationSequence InitSeq(*this, Entity, Kind, 4178 (Expr**)Exprs.get(), Exprs.size()); 4179 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4180 if (Result.isInvalid()) { 4181 VDecl->setInvalidDecl(); 4182 return; 4183 } 4184 4185 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4186 VDecl->setInit(Result.takeAs<Expr>()); 4187 VDecl->setCXXDirectInitializer(true); 4188 4189 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4190 FinalizeVarWithDestructor(VDecl, Record); 4191} 4192 4193/// \brief Add the applicable constructor candidates for an initialization 4194/// by constructor. 4195static void AddConstructorInitializationCandidates(Sema &SemaRef, 4196 QualType ClassType, 4197 Expr **Args, 4198 unsigned NumArgs, 4199 InitializationKind Kind, 4200 OverloadCandidateSet &CandidateSet) { 4201 // C++ [dcl.init]p14: 4202 // If the initialization is direct-initialization, or if it is 4203 // copy-initialization where the cv-unqualified version of the 4204 // source type is the same class as, or a derived class of, the 4205 // class of the destination, constructors are considered. The 4206 // applicable constructors are enumerated (13.3.1.3), and the 4207 // best one is chosen through overload resolution (13.3). The 4208 // constructor so selected is called to initialize the object, 4209 // with the initializer expression(s) as its argument(s). If no 4210 // constructor applies, or the overload resolution is ambiguous, 4211 // the initialization is ill-formed. 4212 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4213 assert(ClassRec && "Can only initialize a class type here"); 4214 4215 // FIXME: When we decide not to synthesize the implicitly-declared 4216 // constructors, we'll need to make them appear here. 4217 4218 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4219 DeclarationName ConstructorName 4220 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4221 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4222 DeclContext::lookup_const_iterator Con, ConEnd; 4223 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4224 Con != ConEnd; ++Con) { 4225 // Find the constructor (which may be a template). 4226 CXXConstructorDecl *Constructor = 0; 4227 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4228 if (ConstructorTmpl) 4229 Constructor 4230 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4231 else 4232 Constructor = cast<CXXConstructorDecl>(*Con); 4233 4234 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4235 (Kind.getKind() == InitializationKind::IK_Value) || 4236 (Kind.getKind() == InitializationKind::IK_Copy && 4237 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4238 ((Kind.getKind() == InitializationKind::IK_Default) && 4239 Constructor->isDefaultConstructor())) { 4240 if (ConstructorTmpl) 4241 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4242 ConstructorTmpl->getAccess(), 4243 /*ExplicitArgs*/ 0, 4244 Args, NumArgs, CandidateSet); 4245 else 4246 SemaRef.AddOverloadCandidate(Constructor, Constructor->getAccess(), 4247 Args, NumArgs, CandidateSet); 4248 } 4249 } 4250} 4251 4252/// \brief Attempt to perform initialization by constructor 4253/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4254/// copy-initialization. 4255/// 4256/// This routine determines whether initialization by constructor is possible, 4257/// but it does not emit any diagnostics in the case where the initialization 4258/// is ill-formed. 4259/// 4260/// \param ClassType the type of the object being initialized, which must have 4261/// class type. 4262/// 4263/// \param Args the arguments provided to initialize the object 4264/// 4265/// \param NumArgs the number of arguments provided to initialize the object 4266/// 4267/// \param Kind the type of initialization being performed 4268/// 4269/// \returns the constructor used to initialize the object, if successful. 4270/// Otherwise, emits a diagnostic and returns NULL. 4271CXXConstructorDecl * 4272Sema::TryInitializationByConstructor(QualType ClassType, 4273 Expr **Args, unsigned NumArgs, 4274 SourceLocation Loc, 4275 InitializationKind Kind) { 4276 // Build the overload candidate set 4277 OverloadCandidateSet CandidateSet(Loc); 4278 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4279 CandidateSet); 4280 4281 // Determine whether we found a constructor we can use. 4282 OverloadCandidateSet::iterator Best; 4283 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4284 case OR_Success: 4285 case OR_Deleted: 4286 // We found a constructor. Return it. 4287 return cast<CXXConstructorDecl>(Best->Function); 4288 4289 case OR_No_Viable_Function: 4290 case OR_Ambiguous: 4291 // Overload resolution failed. Return nothing. 4292 return 0; 4293 } 4294 4295 // Silence GCC warning 4296 return 0; 4297} 4298 4299/// \brief Given a constructor and the set of arguments provided for the 4300/// constructor, convert the arguments and add any required default arguments 4301/// to form a proper call to this constructor. 4302/// 4303/// \returns true if an error occurred, false otherwise. 4304bool 4305Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4306 MultiExprArg ArgsPtr, 4307 SourceLocation Loc, 4308 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4309 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4310 unsigned NumArgs = ArgsPtr.size(); 4311 Expr **Args = (Expr **)ArgsPtr.get(); 4312 4313 const FunctionProtoType *Proto 4314 = Constructor->getType()->getAs<FunctionProtoType>(); 4315 assert(Proto && "Constructor without a prototype?"); 4316 unsigned NumArgsInProto = Proto->getNumArgs(); 4317 4318 // If too few arguments are available, we'll fill in the rest with defaults. 4319 if (NumArgs < NumArgsInProto) 4320 ConvertedArgs.reserve(NumArgsInProto); 4321 else 4322 ConvertedArgs.reserve(NumArgs); 4323 4324 VariadicCallType CallType = 4325 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4326 llvm::SmallVector<Expr *, 8> AllArgs; 4327 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4328 Proto, 0, Args, NumArgs, AllArgs, 4329 CallType); 4330 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4331 ConvertedArgs.push_back(AllArgs[i]); 4332 return Invalid; 4333} 4334 4335/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4336/// determine whether they are reference-related, 4337/// reference-compatible, reference-compatible with added 4338/// qualification, or incompatible, for use in C++ initialization by 4339/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4340/// type, and the first type (T1) is the pointee type of the reference 4341/// type being initialized. 4342Sema::ReferenceCompareResult 4343Sema::CompareReferenceRelationship(SourceLocation Loc, 4344 QualType OrigT1, QualType OrigT2, 4345 bool& DerivedToBase) { 4346 assert(!OrigT1->isReferenceType() && 4347 "T1 must be the pointee type of the reference type"); 4348 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4349 4350 QualType T1 = Context.getCanonicalType(OrigT1); 4351 QualType T2 = Context.getCanonicalType(OrigT2); 4352 Qualifiers T1Quals, T2Quals; 4353 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4354 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4355 4356 // C++ [dcl.init.ref]p4: 4357 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4358 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4359 // T1 is a base class of T2. 4360 if (UnqualT1 == UnqualT2) 4361 DerivedToBase = false; 4362 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4363 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4364 IsDerivedFrom(UnqualT2, UnqualT1)) 4365 DerivedToBase = true; 4366 else 4367 return Ref_Incompatible; 4368 4369 // At this point, we know that T1 and T2 are reference-related (at 4370 // least). 4371 4372 // If the type is an array type, promote the element qualifiers to the type 4373 // for comparison. 4374 if (isa<ArrayType>(T1) && T1Quals) 4375 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4376 if (isa<ArrayType>(T2) && T2Quals) 4377 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4378 4379 // C++ [dcl.init.ref]p4: 4380 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4381 // reference-related to T2 and cv1 is the same cv-qualification 4382 // as, or greater cv-qualification than, cv2. For purposes of 4383 // overload resolution, cases for which cv1 is greater 4384 // cv-qualification than cv2 are identified as 4385 // reference-compatible with added qualification (see 13.3.3.2). 4386 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4387 return Ref_Compatible; 4388 else if (T1.isMoreQualifiedThan(T2)) 4389 return Ref_Compatible_With_Added_Qualification; 4390 else 4391 return Ref_Related; 4392} 4393 4394/// CheckReferenceInit - Check the initialization of a reference 4395/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4396/// the initializer (either a simple initializer or an initializer 4397/// list), and DeclType is the type of the declaration. When ICS is 4398/// non-null, this routine will compute the implicit conversion 4399/// sequence according to C++ [over.ics.ref] and will not produce any 4400/// diagnostics; when ICS is null, it will emit diagnostics when any 4401/// errors are found. Either way, a return value of true indicates 4402/// that there was a failure, a return value of false indicates that 4403/// the reference initialization succeeded. 4404/// 4405/// When @p SuppressUserConversions, user-defined conversions are 4406/// suppressed. 4407/// When @p AllowExplicit, we also permit explicit user-defined 4408/// conversion functions. 4409/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4410/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4411/// This is used when this is called from a C-style cast. 4412bool 4413Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4414 SourceLocation DeclLoc, 4415 bool SuppressUserConversions, 4416 bool AllowExplicit, bool ForceRValue, 4417 ImplicitConversionSequence *ICS, 4418 bool IgnoreBaseAccess) { 4419 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4420 4421 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4422 QualType T2 = Init->getType(); 4423 4424 // If the initializer is the address of an overloaded function, try 4425 // to resolve the overloaded function. If all goes well, T2 is the 4426 // type of the resulting function. 4427 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4428 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4429 ICS != 0); 4430 if (Fn) { 4431 // Since we're performing this reference-initialization for 4432 // real, update the initializer with the resulting function. 4433 if (!ICS) { 4434 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4435 return true; 4436 4437 Init = FixOverloadedFunctionReference(Init, Fn); 4438 } 4439 4440 T2 = Fn->getType(); 4441 } 4442 } 4443 4444 // Compute some basic properties of the types and the initializer. 4445 bool isRValRef = DeclType->isRValueReferenceType(); 4446 bool DerivedToBase = false; 4447 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4448 Init->isLvalue(Context); 4449 ReferenceCompareResult RefRelationship 4450 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4451 4452 // Most paths end in a failed conversion. 4453 if (ICS) { 4454 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4455 } 4456 4457 // C++ [dcl.init.ref]p5: 4458 // A reference to type "cv1 T1" is initialized by an expression 4459 // of type "cv2 T2" as follows: 4460 4461 // -- If the initializer expression 4462 4463 // Rvalue references cannot bind to lvalues (N2812). 4464 // There is absolutely no situation where they can. In particular, note that 4465 // this is ill-formed, even if B has a user-defined conversion to A&&: 4466 // B b; 4467 // A&& r = b; 4468 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4469 if (!ICS) 4470 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4471 << Init->getSourceRange(); 4472 return true; 4473 } 4474 4475 bool BindsDirectly = false; 4476 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4477 // reference-compatible with "cv2 T2," or 4478 // 4479 // Note that the bit-field check is skipped if we are just computing 4480 // the implicit conversion sequence (C++ [over.best.ics]p2). 4481 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4482 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4483 BindsDirectly = true; 4484 4485 if (ICS) { 4486 // C++ [over.ics.ref]p1: 4487 // When a parameter of reference type binds directly (8.5.3) 4488 // to an argument expression, the implicit conversion sequence 4489 // is the identity conversion, unless the argument expression 4490 // has a type that is a derived class of the parameter type, 4491 // in which case the implicit conversion sequence is a 4492 // derived-to-base Conversion (13.3.3.1). 4493 ICS->setStandard(); 4494 ICS->Standard.First = ICK_Identity; 4495 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4496 ICS->Standard.Third = ICK_Identity; 4497 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4498 ICS->Standard.setToType(0, T2); 4499 ICS->Standard.setToType(1, T1); 4500 ICS->Standard.setToType(2, T1); 4501 ICS->Standard.ReferenceBinding = true; 4502 ICS->Standard.DirectBinding = true; 4503 ICS->Standard.RRefBinding = false; 4504 ICS->Standard.CopyConstructor = 0; 4505 4506 // Nothing more to do: the inaccessibility/ambiguity check for 4507 // derived-to-base conversions is suppressed when we're 4508 // computing the implicit conversion sequence (C++ 4509 // [over.best.ics]p2). 4510 return false; 4511 } else { 4512 // Perform the conversion. 4513 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4514 if (DerivedToBase) 4515 CK = CastExpr::CK_DerivedToBase; 4516 else if(CheckExceptionSpecCompatibility(Init, T1)) 4517 return true; 4518 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4519 } 4520 } 4521 4522 // -- has a class type (i.e., T2 is a class type) and can be 4523 // implicitly converted to an lvalue of type "cv3 T3," 4524 // where "cv1 T1" is reference-compatible with "cv3 T3" 4525 // 92) (this conversion is selected by enumerating the 4526 // applicable conversion functions (13.3.1.6) and choosing 4527 // the best one through overload resolution (13.3)), 4528 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4529 !RequireCompleteType(DeclLoc, T2, 0)) { 4530 CXXRecordDecl *T2RecordDecl 4531 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4532 4533 OverloadCandidateSet CandidateSet(DeclLoc); 4534 const UnresolvedSetImpl *Conversions 4535 = T2RecordDecl->getVisibleConversionFunctions(); 4536 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4537 E = Conversions->end(); I != E; ++I) { 4538 NamedDecl *D = *I; 4539 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4540 if (isa<UsingShadowDecl>(D)) 4541 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4542 4543 FunctionTemplateDecl *ConvTemplate 4544 = dyn_cast<FunctionTemplateDecl>(D); 4545 CXXConversionDecl *Conv; 4546 if (ConvTemplate) 4547 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4548 else 4549 Conv = cast<CXXConversionDecl>(D); 4550 4551 // If the conversion function doesn't return a reference type, 4552 // it can't be considered for this conversion. 4553 if (Conv->getConversionType()->isLValueReferenceType() && 4554 (AllowExplicit || !Conv->isExplicit())) { 4555 if (ConvTemplate) 4556 AddTemplateConversionCandidate(ConvTemplate, I.getAccess(), ActingDC, 4557 Init, DeclType, CandidateSet); 4558 else 4559 AddConversionCandidate(Conv, I.getAccess(), ActingDC, Init, 4560 DeclType, CandidateSet); 4561 } 4562 } 4563 4564 OverloadCandidateSet::iterator Best; 4565 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4566 case OR_Success: 4567 // C++ [over.ics.ref]p1: 4568 // 4569 // [...] If the parameter binds directly to the result of 4570 // applying a conversion function to the argument 4571 // expression, the implicit conversion sequence is a 4572 // user-defined conversion sequence (13.3.3.1.2), with the 4573 // second standard conversion sequence either an identity 4574 // conversion or, if the conversion function returns an 4575 // entity of a type that is a derived class of the parameter 4576 // type, a derived-to-base Conversion. 4577 if (!Best->FinalConversion.DirectBinding) 4578 break; 4579 4580 // This is a direct binding. 4581 BindsDirectly = true; 4582 4583 if (ICS) { 4584 ICS->setUserDefined(); 4585 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4586 ICS->UserDefined.After = Best->FinalConversion; 4587 ICS->UserDefined.ConversionFunction = Best->Function; 4588 ICS->UserDefined.EllipsisConversion = false; 4589 assert(ICS->UserDefined.After.ReferenceBinding && 4590 ICS->UserDefined.After.DirectBinding && 4591 "Expected a direct reference binding!"); 4592 return false; 4593 } else { 4594 OwningExprResult InitConversion = 4595 BuildCXXCastArgument(DeclLoc, QualType(), 4596 CastExpr::CK_UserDefinedConversion, 4597 cast<CXXMethodDecl>(Best->Function), 4598 Owned(Init)); 4599 Init = InitConversion.takeAs<Expr>(); 4600 4601 if (CheckExceptionSpecCompatibility(Init, T1)) 4602 return true; 4603 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4604 /*isLvalue=*/true); 4605 } 4606 break; 4607 4608 case OR_Ambiguous: 4609 if (ICS) { 4610 ICS->setAmbiguous(); 4611 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4612 Cand != CandidateSet.end(); ++Cand) 4613 if (Cand->Viable) 4614 ICS->Ambiguous.addConversion(Cand->Function); 4615 break; 4616 } 4617 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4618 << Init->getSourceRange(); 4619 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4620 return true; 4621 4622 case OR_No_Viable_Function: 4623 case OR_Deleted: 4624 // There was no suitable conversion, or we found a deleted 4625 // conversion; continue with other checks. 4626 break; 4627 } 4628 } 4629 4630 if (BindsDirectly) { 4631 // C++ [dcl.init.ref]p4: 4632 // [...] In all cases where the reference-related or 4633 // reference-compatible relationship of two types is used to 4634 // establish the validity of a reference binding, and T1 is a 4635 // base class of T2, a program that necessitates such a binding 4636 // is ill-formed if T1 is an inaccessible (clause 11) or 4637 // ambiguous (10.2) base class of T2. 4638 // 4639 // Note that we only check this condition when we're allowed to 4640 // complain about errors, because we should not be checking for 4641 // ambiguity (or inaccessibility) unless the reference binding 4642 // actually happens. 4643 if (DerivedToBase) 4644 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4645 Init->getSourceRange(), 4646 IgnoreBaseAccess); 4647 else 4648 return false; 4649 } 4650 4651 // -- Otherwise, the reference shall be to a non-volatile const 4652 // type (i.e., cv1 shall be const), or the reference shall be an 4653 // rvalue reference and the initializer expression shall be an rvalue. 4654 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4655 if (!ICS) 4656 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4657 << T1.isVolatileQualified() 4658 << T1 << int(InitLvalue != Expr::LV_Valid) 4659 << T2 << Init->getSourceRange(); 4660 return true; 4661 } 4662 4663 // -- If the initializer expression is an rvalue, with T2 a 4664 // class type, and "cv1 T1" is reference-compatible with 4665 // "cv2 T2," the reference is bound in one of the 4666 // following ways (the choice is implementation-defined): 4667 // 4668 // -- The reference is bound to the object represented by 4669 // the rvalue (see 3.10) or to a sub-object within that 4670 // object. 4671 // 4672 // -- A temporary of type "cv1 T2" [sic] is created, and 4673 // a constructor is called to copy the entire rvalue 4674 // object into the temporary. The reference is bound to 4675 // the temporary or to a sub-object within the 4676 // temporary. 4677 // 4678 // The constructor that would be used to make the copy 4679 // shall be callable whether or not the copy is actually 4680 // done. 4681 // 4682 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4683 // freedom, so we will always take the first option and never build 4684 // a temporary in this case. FIXME: We will, however, have to check 4685 // for the presence of a copy constructor in C++98/03 mode. 4686 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4687 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4688 if (ICS) { 4689 ICS->setStandard(); 4690 ICS->Standard.First = ICK_Identity; 4691 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4692 ICS->Standard.Third = ICK_Identity; 4693 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4694 ICS->Standard.setToType(0, T2); 4695 ICS->Standard.setToType(1, T1); 4696 ICS->Standard.setToType(2, T1); 4697 ICS->Standard.ReferenceBinding = true; 4698 ICS->Standard.DirectBinding = false; 4699 ICS->Standard.RRefBinding = isRValRef; 4700 ICS->Standard.CopyConstructor = 0; 4701 } else { 4702 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4703 if (DerivedToBase) 4704 CK = CastExpr::CK_DerivedToBase; 4705 else if(CheckExceptionSpecCompatibility(Init, T1)) 4706 return true; 4707 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4708 } 4709 return false; 4710 } 4711 4712 // -- Otherwise, a temporary of type "cv1 T1" is created and 4713 // initialized from the initializer expression using the 4714 // rules for a non-reference copy initialization (8.5). The 4715 // reference is then bound to the temporary. If T1 is 4716 // reference-related to T2, cv1 must be the same 4717 // cv-qualification as, or greater cv-qualification than, 4718 // cv2; otherwise, the program is ill-formed. 4719 if (RefRelationship == Ref_Related) { 4720 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4721 // we would be reference-compatible or reference-compatible with 4722 // added qualification. But that wasn't the case, so the reference 4723 // initialization fails. 4724 if (!ICS) 4725 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4726 << T1 << int(InitLvalue != Expr::LV_Valid) 4727 << T2 << Init->getSourceRange(); 4728 return true; 4729 } 4730 4731 // If at least one of the types is a class type, the types are not 4732 // related, and we aren't allowed any user conversions, the 4733 // reference binding fails. This case is important for breaking 4734 // recursion, since TryImplicitConversion below will attempt to 4735 // create a temporary through the use of a copy constructor. 4736 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4737 (T1->isRecordType() || T2->isRecordType())) { 4738 if (!ICS) 4739 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4740 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4741 return true; 4742 } 4743 4744 // Actually try to convert the initializer to T1. 4745 if (ICS) { 4746 // C++ [over.ics.ref]p2: 4747 // 4748 // When a parameter of reference type is not bound directly to 4749 // an argument expression, the conversion sequence is the one 4750 // required to convert the argument expression to the 4751 // underlying type of the reference according to 4752 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4753 // to copy-initializing a temporary of the underlying type with 4754 // the argument expression. Any difference in top-level 4755 // cv-qualification is subsumed by the initialization itself 4756 // and does not constitute a conversion. 4757 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4758 /*AllowExplicit=*/false, 4759 /*ForceRValue=*/false, 4760 /*InOverloadResolution=*/false); 4761 4762 // Of course, that's still a reference binding. 4763 if (ICS->isStandard()) { 4764 ICS->Standard.ReferenceBinding = true; 4765 ICS->Standard.RRefBinding = isRValRef; 4766 } else if (ICS->isUserDefined()) { 4767 ICS->UserDefined.After.ReferenceBinding = true; 4768 ICS->UserDefined.After.RRefBinding = isRValRef; 4769 } 4770 return ICS->isBad(); 4771 } else { 4772 ImplicitConversionSequence Conversions; 4773 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4774 false, false, 4775 Conversions); 4776 if (badConversion) { 4777 if (Conversions.isAmbiguous()) { 4778 Diag(DeclLoc, 4779 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4780 for (int j = Conversions.Ambiguous.conversions().size()-1; 4781 j >= 0; j--) { 4782 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4783 NoteOverloadCandidate(Func); 4784 } 4785 } 4786 else { 4787 if (isRValRef) 4788 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4789 << Init->getSourceRange(); 4790 else 4791 Diag(DeclLoc, diag::err_invalid_initialization) 4792 << DeclType << Init->getType() << Init->getSourceRange(); 4793 } 4794 } 4795 return badConversion; 4796 } 4797} 4798 4799static inline bool 4800CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4801 const FunctionDecl *FnDecl) { 4802 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4803 if (isa<NamespaceDecl>(DC)) { 4804 return SemaRef.Diag(FnDecl->getLocation(), 4805 diag::err_operator_new_delete_declared_in_namespace) 4806 << FnDecl->getDeclName(); 4807 } 4808 4809 if (isa<TranslationUnitDecl>(DC) && 4810 FnDecl->getStorageClass() == FunctionDecl::Static) { 4811 return SemaRef.Diag(FnDecl->getLocation(), 4812 diag::err_operator_new_delete_declared_static) 4813 << FnDecl->getDeclName(); 4814 } 4815 4816 return false; 4817} 4818 4819static inline bool 4820CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4821 CanQualType ExpectedResultType, 4822 CanQualType ExpectedFirstParamType, 4823 unsigned DependentParamTypeDiag, 4824 unsigned InvalidParamTypeDiag) { 4825 QualType ResultType = 4826 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4827 4828 // Check that the result type is not dependent. 4829 if (ResultType->isDependentType()) 4830 return SemaRef.Diag(FnDecl->getLocation(), 4831 diag::err_operator_new_delete_dependent_result_type) 4832 << FnDecl->getDeclName() << ExpectedResultType; 4833 4834 // Check that the result type is what we expect. 4835 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4836 return SemaRef.Diag(FnDecl->getLocation(), 4837 diag::err_operator_new_delete_invalid_result_type) 4838 << FnDecl->getDeclName() << ExpectedResultType; 4839 4840 // A function template must have at least 2 parameters. 4841 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4842 return SemaRef.Diag(FnDecl->getLocation(), 4843 diag::err_operator_new_delete_template_too_few_parameters) 4844 << FnDecl->getDeclName(); 4845 4846 // The function decl must have at least 1 parameter. 4847 if (FnDecl->getNumParams() == 0) 4848 return SemaRef.Diag(FnDecl->getLocation(), 4849 diag::err_operator_new_delete_too_few_parameters) 4850 << FnDecl->getDeclName(); 4851 4852 // Check the the first parameter type is not dependent. 4853 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4854 if (FirstParamType->isDependentType()) 4855 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4856 << FnDecl->getDeclName() << ExpectedFirstParamType; 4857 4858 // Check that the first parameter type is what we expect. 4859 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4860 ExpectedFirstParamType) 4861 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4862 << FnDecl->getDeclName() << ExpectedFirstParamType; 4863 4864 return false; 4865} 4866 4867static bool 4868CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4869 // C++ [basic.stc.dynamic.allocation]p1: 4870 // A program is ill-formed if an allocation function is declared in a 4871 // namespace scope other than global scope or declared static in global 4872 // scope. 4873 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4874 return true; 4875 4876 CanQualType SizeTy = 4877 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4878 4879 // C++ [basic.stc.dynamic.allocation]p1: 4880 // The return type shall be void*. The first parameter shall have type 4881 // std::size_t. 4882 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4883 SizeTy, 4884 diag::err_operator_new_dependent_param_type, 4885 diag::err_operator_new_param_type)) 4886 return true; 4887 4888 // C++ [basic.stc.dynamic.allocation]p1: 4889 // The first parameter shall not have an associated default argument. 4890 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4891 return SemaRef.Diag(FnDecl->getLocation(), 4892 diag::err_operator_new_default_arg) 4893 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4894 4895 return false; 4896} 4897 4898static bool 4899CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4900 // C++ [basic.stc.dynamic.deallocation]p1: 4901 // A program is ill-formed if deallocation functions are declared in a 4902 // namespace scope other than global scope or declared static in global 4903 // scope. 4904 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4905 return true; 4906 4907 // C++ [basic.stc.dynamic.deallocation]p2: 4908 // Each deallocation function shall return void and its first parameter 4909 // shall be void*. 4910 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4911 SemaRef.Context.VoidPtrTy, 4912 diag::err_operator_delete_dependent_param_type, 4913 diag::err_operator_delete_param_type)) 4914 return true; 4915 4916 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4917 if (FirstParamType->isDependentType()) 4918 return SemaRef.Diag(FnDecl->getLocation(), 4919 diag::err_operator_delete_dependent_param_type) 4920 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4921 4922 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4923 SemaRef.Context.VoidPtrTy) 4924 return SemaRef.Diag(FnDecl->getLocation(), 4925 diag::err_operator_delete_param_type) 4926 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4927 4928 return false; 4929} 4930 4931/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4932/// of this overloaded operator is well-formed. If so, returns false; 4933/// otherwise, emits appropriate diagnostics and returns true. 4934bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4935 assert(FnDecl && FnDecl->isOverloadedOperator() && 4936 "Expected an overloaded operator declaration"); 4937 4938 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4939 4940 // C++ [over.oper]p5: 4941 // The allocation and deallocation functions, operator new, 4942 // operator new[], operator delete and operator delete[], are 4943 // described completely in 3.7.3. The attributes and restrictions 4944 // found in the rest of this subclause do not apply to them unless 4945 // explicitly stated in 3.7.3. 4946 if (Op == OO_Delete || Op == OO_Array_Delete) 4947 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4948 4949 if (Op == OO_New || Op == OO_Array_New) 4950 return CheckOperatorNewDeclaration(*this, FnDecl); 4951 4952 // C++ [over.oper]p6: 4953 // An operator function shall either be a non-static member 4954 // function or be a non-member function and have at least one 4955 // parameter whose type is a class, a reference to a class, an 4956 // enumeration, or a reference to an enumeration. 4957 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4958 if (MethodDecl->isStatic()) 4959 return Diag(FnDecl->getLocation(), 4960 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4961 } else { 4962 bool ClassOrEnumParam = false; 4963 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4964 ParamEnd = FnDecl->param_end(); 4965 Param != ParamEnd; ++Param) { 4966 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4967 if (ParamType->isDependentType() || ParamType->isRecordType() || 4968 ParamType->isEnumeralType()) { 4969 ClassOrEnumParam = true; 4970 break; 4971 } 4972 } 4973 4974 if (!ClassOrEnumParam) 4975 return Diag(FnDecl->getLocation(), 4976 diag::err_operator_overload_needs_class_or_enum) 4977 << FnDecl->getDeclName(); 4978 } 4979 4980 // C++ [over.oper]p8: 4981 // An operator function cannot have default arguments (8.3.6), 4982 // except where explicitly stated below. 4983 // 4984 // Only the function-call operator allows default arguments 4985 // (C++ [over.call]p1). 4986 if (Op != OO_Call) { 4987 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4988 Param != FnDecl->param_end(); ++Param) { 4989 if ((*Param)->hasDefaultArg()) 4990 return Diag((*Param)->getLocation(), 4991 diag::err_operator_overload_default_arg) 4992 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4993 } 4994 } 4995 4996 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4997 { false, false, false } 4998#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4999 , { Unary, Binary, MemberOnly } 5000#include "clang/Basic/OperatorKinds.def" 5001 }; 5002 5003 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5004 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5005 bool MustBeMemberOperator = OperatorUses[Op][2]; 5006 5007 // C++ [over.oper]p8: 5008 // [...] Operator functions cannot have more or fewer parameters 5009 // than the number required for the corresponding operator, as 5010 // described in the rest of this subclause. 5011 unsigned NumParams = FnDecl->getNumParams() 5012 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5013 if (Op != OO_Call && 5014 ((NumParams == 1 && !CanBeUnaryOperator) || 5015 (NumParams == 2 && !CanBeBinaryOperator) || 5016 (NumParams < 1) || (NumParams > 2))) { 5017 // We have the wrong number of parameters. 5018 unsigned ErrorKind; 5019 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5020 ErrorKind = 2; // 2 -> unary or binary. 5021 } else if (CanBeUnaryOperator) { 5022 ErrorKind = 0; // 0 -> unary 5023 } else { 5024 assert(CanBeBinaryOperator && 5025 "All non-call overloaded operators are unary or binary!"); 5026 ErrorKind = 1; // 1 -> binary 5027 } 5028 5029 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5030 << FnDecl->getDeclName() << NumParams << ErrorKind; 5031 } 5032 5033 // Overloaded operators other than operator() cannot be variadic. 5034 if (Op != OO_Call && 5035 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5036 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5037 << FnDecl->getDeclName(); 5038 } 5039 5040 // Some operators must be non-static member functions. 5041 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5042 return Diag(FnDecl->getLocation(), 5043 diag::err_operator_overload_must_be_member) 5044 << FnDecl->getDeclName(); 5045 } 5046 5047 // C++ [over.inc]p1: 5048 // The user-defined function called operator++ implements the 5049 // prefix and postfix ++ operator. If this function is a member 5050 // function with no parameters, or a non-member function with one 5051 // parameter of class or enumeration type, it defines the prefix 5052 // increment operator ++ for objects of that type. If the function 5053 // is a member function with one parameter (which shall be of type 5054 // int) or a non-member function with two parameters (the second 5055 // of which shall be of type int), it defines the postfix 5056 // increment operator ++ for objects of that type. 5057 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5058 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5059 bool ParamIsInt = false; 5060 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5061 ParamIsInt = BT->getKind() == BuiltinType::Int; 5062 5063 if (!ParamIsInt) 5064 return Diag(LastParam->getLocation(), 5065 diag::err_operator_overload_post_incdec_must_be_int) 5066 << LastParam->getType() << (Op == OO_MinusMinus); 5067 } 5068 5069 // Notify the class if it got an assignment operator. 5070 if (Op == OO_Equal) { 5071 // Would have returned earlier otherwise. 5072 assert(isa<CXXMethodDecl>(FnDecl) && 5073 "Overloaded = not member, but not filtered."); 5074 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5075 Method->getParent()->addedAssignmentOperator(Context, Method); 5076 } 5077 5078 return false; 5079} 5080 5081/// CheckLiteralOperatorDeclaration - Check whether the declaration 5082/// of this literal operator function is well-formed. If so, returns 5083/// false; otherwise, emits appropriate diagnostics and returns true. 5084bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5085 DeclContext *DC = FnDecl->getDeclContext(); 5086 Decl::Kind Kind = DC->getDeclKind(); 5087 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5088 Kind != Decl::LinkageSpec) { 5089 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5090 << FnDecl->getDeclName(); 5091 return true; 5092 } 5093 5094 bool Valid = false; 5095 5096 // FIXME: Check for the one valid template signature 5097 // template <char...> type operator "" name(); 5098 5099 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5100 // Check the first parameter 5101 QualType T = (*Param)->getType(); 5102 5103 // unsigned long long int and long double are allowed, but only 5104 // alone. 5105 // We also allow any character type; their omission seems to be a bug 5106 // in n3000 5107 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5108 Context.hasSameType(T, Context.LongDoubleTy) || 5109 Context.hasSameType(T, Context.CharTy) || 5110 Context.hasSameType(T, Context.WCharTy) || 5111 Context.hasSameType(T, Context.Char16Ty) || 5112 Context.hasSameType(T, Context.Char32Ty)) { 5113 if (++Param == FnDecl->param_end()) 5114 Valid = true; 5115 goto FinishedParams; 5116 } 5117 5118 // Otherwise it must be a pointer to const; let's strip those. 5119 const PointerType *PT = T->getAs<PointerType>(); 5120 if (!PT) 5121 goto FinishedParams; 5122 T = PT->getPointeeType(); 5123 if (!T.isConstQualified()) 5124 goto FinishedParams; 5125 T = T.getUnqualifiedType(); 5126 5127 // Move on to the second parameter; 5128 ++Param; 5129 5130 // If there is no second parameter, the first must be a const char * 5131 if (Param == FnDecl->param_end()) { 5132 if (Context.hasSameType(T, Context.CharTy)) 5133 Valid = true; 5134 goto FinishedParams; 5135 } 5136 5137 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5138 // are allowed as the first parameter to a two-parameter function 5139 if (!(Context.hasSameType(T, Context.CharTy) || 5140 Context.hasSameType(T, Context.WCharTy) || 5141 Context.hasSameType(T, Context.Char16Ty) || 5142 Context.hasSameType(T, Context.Char32Ty))) 5143 goto FinishedParams; 5144 5145 // The second and final parameter must be an std::size_t 5146 T = (*Param)->getType().getUnqualifiedType(); 5147 if (Context.hasSameType(T, Context.getSizeType()) && 5148 ++Param == FnDecl->param_end()) 5149 Valid = true; 5150 } 5151 5152 // FIXME: This diagnostic is absolutely terrible. 5153FinishedParams: 5154 if (!Valid) { 5155 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5156 << FnDecl->getDeclName(); 5157 return true; 5158 } 5159 5160 return false; 5161} 5162 5163/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5164/// linkage specification, including the language and (if present) 5165/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5166/// the location of the language string literal, which is provided 5167/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5168/// the '{' brace. Otherwise, this linkage specification does not 5169/// have any braces. 5170Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5171 SourceLocation ExternLoc, 5172 SourceLocation LangLoc, 5173 const char *Lang, 5174 unsigned StrSize, 5175 SourceLocation LBraceLoc) { 5176 LinkageSpecDecl::LanguageIDs Language; 5177 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5178 Language = LinkageSpecDecl::lang_c; 5179 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5180 Language = LinkageSpecDecl::lang_cxx; 5181 else { 5182 Diag(LangLoc, diag::err_bad_language); 5183 return DeclPtrTy(); 5184 } 5185 5186 // FIXME: Add all the various semantics of linkage specifications 5187 5188 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5189 LangLoc, Language, 5190 LBraceLoc.isValid()); 5191 CurContext->addDecl(D); 5192 PushDeclContext(S, D); 5193 return DeclPtrTy::make(D); 5194} 5195 5196/// ActOnFinishLinkageSpecification - Completely the definition of 5197/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5198/// valid, it's the position of the closing '}' brace in a linkage 5199/// specification that uses braces. 5200Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5201 DeclPtrTy LinkageSpec, 5202 SourceLocation RBraceLoc) { 5203 if (LinkageSpec) 5204 PopDeclContext(); 5205 return LinkageSpec; 5206} 5207 5208/// \brief Perform semantic analysis for the variable declaration that 5209/// occurs within a C++ catch clause, returning the newly-created 5210/// variable. 5211VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5212 TypeSourceInfo *TInfo, 5213 IdentifierInfo *Name, 5214 SourceLocation Loc, 5215 SourceRange Range) { 5216 bool Invalid = false; 5217 5218 // Arrays and functions decay. 5219 if (ExDeclType->isArrayType()) 5220 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5221 else if (ExDeclType->isFunctionType()) 5222 ExDeclType = Context.getPointerType(ExDeclType); 5223 5224 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5225 // The exception-declaration shall not denote a pointer or reference to an 5226 // incomplete type, other than [cv] void*. 5227 // N2844 forbids rvalue references. 5228 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5229 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5230 Invalid = true; 5231 } 5232 5233 // GCC allows catching pointers and references to incomplete types 5234 // as an extension; so do we, but we warn by default. 5235 5236 QualType BaseType = ExDeclType; 5237 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5238 unsigned DK = diag::err_catch_incomplete; 5239 bool IncompleteCatchIsInvalid = true; 5240 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5241 BaseType = Ptr->getPointeeType(); 5242 Mode = 1; 5243 DK = diag::ext_catch_incomplete_ptr; 5244 IncompleteCatchIsInvalid = false; 5245 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5246 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5247 BaseType = Ref->getPointeeType(); 5248 Mode = 2; 5249 DK = diag::ext_catch_incomplete_ref; 5250 IncompleteCatchIsInvalid = false; 5251 } 5252 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5253 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5254 IncompleteCatchIsInvalid) 5255 Invalid = true; 5256 5257 if (!Invalid && !ExDeclType->isDependentType() && 5258 RequireNonAbstractType(Loc, ExDeclType, 5259 diag::err_abstract_type_in_decl, 5260 AbstractVariableType)) 5261 Invalid = true; 5262 5263 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5264 Name, ExDeclType, TInfo, VarDecl::None); 5265 5266 if (!Invalid) { 5267 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5268 // C++ [except.handle]p16: 5269 // The object declared in an exception-declaration or, if the 5270 // exception-declaration does not specify a name, a temporary (12.2) is 5271 // copy-initialized (8.5) from the exception object. [...] 5272 // The object is destroyed when the handler exits, after the destruction 5273 // of any automatic objects initialized within the handler. 5274 // 5275 // We just pretend to initialize the object with itself, then make sure 5276 // it can be destroyed later. 5277 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5278 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5279 Loc, ExDeclType, 0); 5280 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5281 SourceLocation()); 5282 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5283 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5284 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5285 if (Result.isInvalid()) 5286 Invalid = true; 5287 else 5288 FinalizeVarWithDestructor(ExDecl, RecordTy); 5289 } 5290 } 5291 5292 if (Invalid) 5293 ExDecl->setInvalidDecl(); 5294 5295 return ExDecl; 5296} 5297 5298/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5299/// handler. 5300Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5301 TypeSourceInfo *TInfo = 0; 5302 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5303 5304 bool Invalid = D.isInvalidType(); 5305 IdentifierInfo *II = D.getIdentifier(); 5306 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5307 // The scope should be freshly made just for us. There is just no way 5308 // it contains any previous declaration. 5309 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5310 if (PrevDecl->isTemplateParameter()) { 5311 // Maybe we will complain about the shadowed template parameter. 5312 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5313 } 5314 } 5315 5316 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5317 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5318 << D.getCXXScopeSpec().getRange(); 5319 Invalid = true; 5320 } 5321 5322 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5323 D.getIdentifier(), 5324 D.getIdentifierLoc(), 5325 D.getDeclSpec().getSourceRange()); 5326 5327 if (Invalid) 5328 ExDecl->setInvalidDecl(); 5329 5330 // Add the exception declaration into this scope. 5331 if (II) 5332 PushOnScopeChains(ExDecl, S); 5333 else 5334 CurContext->addDecl(ExDecl); 5335 5336 ProcessDeclAttributes(S, ExDecl, D); 5337 return DeclPtrTy::make(ExDecl); 5338} 5339 5340Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5341 ExprArg assertexpr, 5342 ExprArg assertmessageexpr) { 5343 Expr *AssertExpr = (Expr *)assertexpr.get(); 5344 StringLiteral *AssertMessage = 5345 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5346 5347 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5348 llvm::APSInt Value(32); 5349 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5350 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5351 AssertExpr->getSourceRange(); 5352 return DeclPtrTy(); 5353 } 5354 5355 if (Value == 0) { 5356 Diag(AssertLoc, diag::err_static_assert_failed) 5357 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5358 } 5359 } 5360 5361 assertexpr.release(); 5362 assertmessageexpr.release(); 5363 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5364 AssertExpr, AssertMessage); 5365 5366 CurContext->addDecl(Decl); 5367 return DeclPtrTy::make(Decl); 5368} 5369 5370/// Handle a friend type declaration. This works in tandem with 5371/// ActOnTag. 5372/// 5373/// Notes on friend class templates: 5374/// 5375/// We generally treat friend class declarations as if they were 5376/// declaring a class. So, for example, the elaborated type specifier 5377/// in a friend declaration is required to obey the restrictions of a 5378/// class-head (i.e. no typedefs in the scope chain), template 5379/// parameters are required to match up with simple template-ids, &c. 5380/// However, unlike when declaring a template specialization, it's 5381/// okay to refer to a template specialization without an empty 5382/// template parameter declaration, e.g. 5383/// friend class A<T>::B<unsigned>; 5384/// We permit this as a special case; if there are any template 5385/// parameters present at all, require proper matching, i.e. 5386/// template <> template <class T> friend class A<int>::B; 5387Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5388 MultiTemplateParamsArg TempParams) { 5389 SourceLocation Loc = DS.getSourceRange().getBegin(); 5390 5391 assert(DS.isFriendSpecified()); 5392 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5393 5394 // Try to convert the decl specifier to a type. This works for 5395 // friend templates because ActOnTag never produces a ClassTemplateDecl 5396 // for a TUK_Friend. 5397 Declarator TheDeclarator(DS, Declarator::MemberContext); 5398 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5399 if (TheDeclarator.isInvalidType()) 5400 return DeclPtrTy(); 5401 5402 // This is definitely an error in C++98. It's probably meant to 5403 // be forbidden in C++0x, too, but the specification is just 5404 // poorly written. 5405 // 5406 // The problem is with declarations like the following: 5407 // template <T> friend A<T>::foo; 5408 // where deciding whether a class C is a friend or not now hinges 5409 // on whether there exists an instantiation of A that causes 5410 // 'foo' to equal C. There are restrictions on class-heads 5411 // (which we declare (by fiat) elaborated friend declarations to 5412 // be) that makes this tractable. 5413 // 5414 // FIXME: handle "template <> friend class A<T>;", which 5415 // is possibly well-formed? Who even knows? 5416 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5417 Diag(Loc, diag::err_tagless_friend_type_template) 5418 << DS.getSourceRange(); 5419 return DeclPtrTy(); 5420 } 5421 5422 // C++ [class.friend]p2: 5423 // An elaborated-type-specifier shall be used in a friend declaration 5424 // for a class.* 5425 // * The class-key of the elaborated-type-specifier is required. 5426 // This is one of the rare places in Clang where it's legitimate to 5427 // ask about the "spelling" of the type. 5428 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5429 // If we evaluated the type to a record type, suggest putting 5430 // a tag in front. 5431 if (const RecordType *RT = T->getAs<RecordType>()) { 5432 RecordDecl *RD = RT->getDecl(); 5433 5434 std::string InsertionText = std::string(" ") + RD->getKindName(); 5435 5436 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5437 << (unsigned) RD->getTagKind() 5438 << T 5439 << SourceRange(DS.getFriendSpecLoc()) 5440 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5441 InsertionText); 5442 return DeclPtrTy(); 5443 }else { 5444 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5445 << DS.getSourceRange(); 5446 return DeclPtrTy(); 5447 } 5448 } 5449 5450 // Enum types cannot be friends. 5451 if (T->getAs<EnumType>()) { 5452 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5453 << SourceRange(DS.getFriendSpecLoc()); 5454 return DeclPtrTy(); 5455 } 5456 5457 // C++98 [class.friend]p1: A friend of a class is a function 5458 // or class that is not a member of the class . . . 5459 // This is fixed in DR77, which just barely didn't make the C++03 5460 // deadline. It's also a very silly restriction that seriously 5461 // affects inner classes and which nobody else seems to implement; 5462 // thus we never diagnose it, not even in -pedantic. 5463 5464 Decl *D; 5465 if (TempParams.size()) 5466 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5467 TempParams.size(), 5468 (TemplateParameterList**) TempParams.release(), 5469 T.getTypePtr(), 5470 DS.getFriendSpecLoc()); 5471 else 5472 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5473 DS.getFriendSpecLoc()); 5474 D->setAccess(AS_public); 5475 CurContext->addDecl(D); 5476 5477 return DeclPtrTy::make(D); 5478} 5479 5480Sema::DeclPtrTy 5481Sema::ActOnFriendFunctionDecl(Scope *S, 5482 Declarator &D, 5483 bool IsDefinition, 5484 MultiTemplateParamsArg TemplateParams) { 5485 const DeclSpec &DS = D.getDeclSpec(); 5486 5487 assert(DS.isFriendSpecified()); 5488 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5489 5490 SourceLocation Loc = D.getIdentifierLoc(); 5491 TypeSourceInfo *TInfo = 0; 5492 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5493 5494 // C++ [class.friend]p1 5495 // A friend of a class is a function or class.... 5496 // Note that this sees through typedefs, which is intended. 5497 // It *doesn't* see through dependent types, which is correct 5498 // according to [temp.arg.type]p3: 5499 // If a declaration acquires a function type through a 5500 // type dependent on a template-parameter and this causes 5501 // a declaration that does not use the syntactic form of a 5502 // function declarator to have a function type, the program 5503 // is ill-formed. 5504 if (!T->isFunctionType()) { 5505 Diag(Loc, diag::err_unexpected_friend); 5506 5507 // It might be worthwhile to try to recover by creating an 5508 // appropriate declaration. 5509 return DeclPtrTy(); 5510 } 5511 5512 // C++ [namespace.memdef]p3 5513 // - If a friend declaration in a non-local class first declares a 5514 // class or function, the friend class or function is a member 5515 // of the innermost enclosing namespace. 5516 // - The name of the friend is not found by simple name lookup 5517 // until a matching declaration is provided in that namespace 5518 // scope (either before or after the class declaration granting 5519 // friendship). 5520 // - If a friend function is called, its name may be found by the 5521 // name lookup that considers functions from namespaces and 5522 // classes associated with the types of the function arguments. 5523 // - When looking for a prior declaration of a class or a function 5524 // declared as a friend, scopes outside the innermost enclosing 5525 // namespace scope are not considered. 5526 5527 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5528 DeclarationName Name = GetNameForDeclarator(D); 5529 assert(Name); 5530 5531 // The context we found the declaration in, or in which we should 5532 // create the declaration. 5533 DeclContext *DC; 5534 5535 // FIXME: handle local classes 5536 5537 // Recover from invalid scope qualifiers as if they just weren't there. 5538 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5539 ForRedeclaration); 5540 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5541 // FIXME: RequireCompleteDeclContext 5542 DC = computeDeclContext(ScopeQual); 5543 5544 // FIXME: handle dependent contexts 5545 if (!DC) return DeclPtrTy(); 5546 5547 LookupQualifiedName(Previous, DC); 5548 5549 // If searching in that context implicitly found a declaration in 5550 // a different context, treat it like it wasn't found at all. 5551 // TODO: better diagnostics for this case. Suggesting the right 5552 // qualified scope would be nice... 5553 // FIXME: getRepresentativeDecl() is not right here at all 5554 if (Previous.empty() || 5555 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5556 D.setInvalidType(); 5557 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5558 return DeclPtrTy(); 5559 } 5560 5561 // C++ [class.friend]p1: A friend of a class is a function or 5562 // class that is not a member of the class . . . 5563 if (DC->Equals(CurContext)) 5564 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5565 5566 // Otherwise walk out to the nearest namespace scope looking for matches. 5567 } else { 5568 // TODO: handle local class contexts. 5569 5570 DC = CurContext; 5571 while (true) { 5572 // Skip class contexts. If someone can cite chapter and verse 5573 // for this behavior, that would be nice --- it's what GCC and 5574 // EDG do, and it seems like a reasonable intent, but the spec 5575 // really only says that checks for unqualified existing 5576 // declarations should stop at the nearest enclosing namespace, 5577 // not that they should only consider the nearest enclosing 5578 // namespace. 5579 while (DC->isRecord()) 5580 DC = DC->getParent(); 5581 5582 LookupQualifiedName(Previous, DC); 5583 5584 // TODO: decide what we think about using declarations. 5585 if (!Previous.empty()) 5586 break; 5587 5588 if (DC->isFileContext()) break; 5589 DC = DC->getParent(); 5590 } 5591 5592 // C++ [class.friend]p1: A friend of a class is a function or 5593 // class that is not a member of the class . . . 5594 // C++0x changes this for both friend types and functions. 5595 // Most C++ 98 compilers do seem to give an error here, so 5596 // we do, too. 5597 if (!Previous.empty() && DC->Equals(CurContext) 5598 && !getLangOptions().CPlusPlus0x) 5599 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5600 } 5601 5602 if (DC->isFileContext()) { 5603 // This implies that it has to be an operator or function. 5604 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5605 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5606 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5607 Diag(Loc, diag::err_introducing_special_friend) << 5608 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5609 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5610 return DeclPtrTy(); 5611 } 5612 } 5613 5614 bool Redeclaration = false; 5615 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5616 move(TemplateParams), 5617 IsDefinition, 5618 Redeclaration); 5619 if (!ND) return DeclPtrTy(); 5620 5621 assert(ND->getDeclContext() == DC); 5622 assert(ND->getLexicalDeclContext() == CurContext); 5623 5624 // Add the function declaration to the appropriate lookup tables, 5625 // adjusting the redeclarations list as necessary. We don't 5626 // want to do this yet if the friending class is dependent. 5627 // 5628 // Also update the scope-based lookup if the target context's 5629 // lookup context is in lexical scope. 5630 if (!CurContext->isDependentContext()) { 5631 DC = DC->getLookupContext(); 5632 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5633 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5634 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5635 } 5636 5637 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5638 D.getIdentifierLoc(), ND, 5639 DS.getFriendSpecLoc()); 5640 FrD->setAccess(AS_public); 5641 CurContext->addDecl(FrD); 5642 5643 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5644 FrD->setSpecialization(true); 5645 5646 return DeclPtrTy::make(ND); 5647} 5648 5649void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5650 AdjustDeclIfTemplate(dcl); 5651 5652 Decl *Dcl = dcl.getAs<Decl>(); 5653 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5654 if (!Fn) { 5655 Diag(DelLoc, diag::err_deleted_non_function); 5656 return; 5657 } 5658 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5659 Diag(DelLoc, diag::err_deleted_decl_not_first); 5660 Diag(Prev->getLocation(), diag::note_previous_declaration); 5661 // If the declaration wasn't the first, we delete the function anyway for 5662 // recovery. 5663 } 5664 Fn->setDeleted(); 5665} 5666 5667static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5668 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5669 ++CI) { 5670 Stmt *SubStmt = *CI; 5671 if (!SubStmt) 5672 continue; 5673 if (isa<ReturnStmt>(SubStmt)) 5674 Self.Diag(SubStmt->getSourceRange().getBegin(), 5675 diag::err_return_in_constructor_handler); 5676 if (!isa<Expr>(SubStmt)) 5677 SearchForReturnInStmt(Self, SubStmt); 5678 } 5679} 5680 5681void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5682 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5683 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5684 SearchForReturnInStmt(*this, Handler); 5685 } 5686} 5687 5688bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5689 const CXXMethodDecl *Old) { 5690 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5691 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5692 5693 if (Context.hasSameType(NewTy, OldTy) || 5694 NewTy->isDependentType() || OldTy->isDependentType()) 5695 return false; 5696 5697 // Check if the return types are covariant 5698 QualType NewClassTy, OldClassTy; 5699 5700 /// Both types must be pointers or references to classes. 5701 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5702 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5703 NewClassTy = NewPT->getPointeeType(); 5704 OldClassTy = OldPT->getPointeeType(); 5705 } 5706 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5707 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5708 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5709 NewClassTy = NewRT->getPointeeType(); 5710 OldClassTy = OldRT->getPointeeType(); 5711 } 5712 } 5713 } 5714 5715 // The return types aren't either both pointers or references to a class type. 5716 if (NewClassTy.isNull()) { 5717 Diag(New->getLocation(), 5718 diag::err_different_return_type_for_overriding_virtual_function) 5719 << New->getDeclName() << NewTy << OldTy; 5720 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5721 5722 return true; 5723 } 5724 5725 // C++ [class.virtual]p6: 5726 // If the return type of D::f differs from the return type of B::f, the 5727 // class type in the return type of D::f shall be complete at the point of 5728 // declaration of D::f or shall be the class type D. 5729 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5730 if (!RT->isBeingDefined() && 5731 RequireCompleteType(New->getLocation(), NewClassTy, 5732 PDiag(diag::err_covariant_return_incomplete) 5733 << New->getDeclName())) 5734 return true; 5735 } 5736 5737 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5738 // Check if the new class derives from the old class. 5739 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5740 Diag(New->getLocation(), 5741 diag::err_covariant_return_not_derived) 5742 << New->getDeclName() << NewTy << OldTy; 5743 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5744 return true; 5745 } 5746 5747 // Check if we the conversion from derived to base is valid. 5748 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5749 diag::err_covariant_return_inaccessible_base, 5750 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5751 // FIXME: Should this point to the return type? 5752 New->getLocation(), SourceRange(), New->getDeclName())) { 5753 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5754 return true; 5755 } 5756 } 5757 5758 // The qualifiers of the return types must be the same. 5759 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5760 Diag(New->getLocation(), 5761 diag::err_covariant_return_type_different_qualifications) 5762 << New->getDeclName() << NewTy << OldTy; 5763 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5764 return true; 5765 }; 5766 5767 5768 // The new class type must have the same or less qualifiers as the old type. 5769 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5770 Diag(New->getLocation(), 5771 diag::err_covariant_return_type_class_type_more_qualified) 5772 << New->getDeclName() << NewTy << OldTy; 5773 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5774 return true; 5775 }; 5776 5777 return false; 5778} 5779 5780bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5781 const CXXMethodDecl *Old) 5782{ 5783 if (Old->hasAttr<FinalAttr>()) { 5784 Diag(New->getLocation(), diag::err_final_function_overridden) 5785 << New->getDeclName(); 5786 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5787 return true; 5788 } 5789 5790 return false; 5791} 5792 5793/// \brief Mark the given method pure. 5794/// 5795/// \param Method the method to be marked pure. 5796/// 5797/// \param InitRange the source range that covers the "0" initializer. 5798bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5799 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5800 Method->setPure(); 5801 5802 // A class is abstract if at least one function is pure virtual. 5803 Method->getParent()->setAbstract(true); 5804 return false; 5805 } 5806 5807 if (!Method->isInvalidDecl()) 5808 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5809 << Method->getDeclName() << InitRange; 5810 return true; 5811} 5812 5813/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5814/// an initializer for the out-of-line declaration 'Dcl'. The scope 5815/// is a fresh scope pushed for just this purpose. 5816/// 5817/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5818/// static data member of class X, names should be looked up in the scope of 5819/// class X. 5820void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5821 // If there is no declaration, there was an error parsing it. 5822 Decl *D = Dcl.getAs<Decl>(); 5823 if (D == 0) return; 5824 5825 // We should only get called for declarations with scope specifiers, like: 5826 // int foo::bar; 5827 assert(D->isOutOfLine()); 5828 EnterDeclaratorContext(S, D->getDeclContext()); 5829} 5830 5831/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5832/// initializer for the out-of-line declaration 'Dcl'. 5833void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5834 // If there is no declaration, there was an error parsing it. 5835 Decl *D = Dcl.getAs<Decl>(); 5836 if (D == 0) return; 5837 5838 assert(D->isOutOfLine()); 5839 ExitDeclaratorContext(S); 5840} 5841 5842/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5843/// C++ if/switch/while/for statement. 5844/// e.g: "if (int x = f()) {...}" 5845Action::DeclResult 5846Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5847 // C++ 6.4p2: 5848 // The declarator shall not specify a function or an array. 5849 // The type-specifier-seq shall not contain typedef and shall not declare a 5850 // new class or enumeration. 5851 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5852 "Parser allowed 'typedef' as storage class of condition decl."); 5853 5854 TypeSourceInfo *TInfo = 0; 5855 TagDecl *OwnedTag = 0; 5856 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5857 5858 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5859 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5860 // would be created and CXXConditionDeclExpr wants a VarDecl. 5861 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5862 << D.getSourceRange(); 5863 return DeclResult(); 5864 } else if (OwnedTag && OwnedTag->isDefinition()) { 5865 // The type-specifier-seq shall not declare a new class or enumeration. 5866 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5867 } 5868 5869 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5870 if (!Dcl) 5871 return DeclResult(); 5872 5873 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5874 VD->setDeclaredInCondition(true); 5875 return Dcl; 5876} 5877 5878static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5879 // Ignore dependent types. 5880 if (MD->isDependentContext()) 5881 return false; 5882 5883 // Ignore declarations that are not definitions. 5884 if (!MD->isThisDeclarationADefinition()) 5885 return false; 5886 5887 CXXRecordDecl *RD = MD->getParent(); 5888 5889 // Ignore classes without a vtable. 5890 if (!RD->isDynamicClass()) 5891 return false; 5892 5893 switch (MD->getParent()->getTemplateSpecializationKind()) { 5894 case TSK_Undeclared: 5895 case TSK_ExplicitSpecialization: 5896 // Classes that aren't instantiations of templates don't need their 5897 // virtual methods marked until we see the definition of the key 5898 // function. 5899 break; 5900 5901 case TSK_ImplicitInstantiation: 5902 // This is a constructor of a class template; mark all of the virtual 5903 // members as referenced to ensure that they get instantiatied. 5904 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5905 return true; 5906 break; 5907 5908 case TSK_ExplicitInstantiationDeclaration: 5909 return true; //FIXME: This looks wrong. 5910 5911 case TSK_ExplicitInstantiationDefinition: 5912 // This is method of a explicit instantiation; mark all of the virtual 5913 // members as referenced to ensure that they get instantiatied. 5914 return true; 5915 } 5916 5917 // Consider only out-of-line definitions of member functions. When we see 5918 // an inline definition, it's too early to compute the key function. 5919 if (!MD->isOutOfLine()) 5920 return false; 5921 5922 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5923 5924 // If there is no key function, we will need a copy of the vtable. 5925 if (!KeyFunction) 5926 return true; 5927 5928 // If this is the key function, we need to mark virtual members. 5929 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5930 return true; 5931 5932 return false; 5933} 5934 5935void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5936 CXXMethodDecl *MD) { 5937 CXXRecordDecl *RD = MD->getParent(); 5938 5939 // We will need to mark all of the virtual members as referenced to build the 5940 // vtable. 5941 if (!needsVtable(MD, Context)) 5942 return; 5943 5944 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5945 if (kind == TSK_ImplicitInstantiation) 5946 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5947 else 5948 MarkVirtualMembersReferenced(Loc, RD); 5949} 5950 5951bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5952 if (ClassesWithUnmarkedVirtualMembers.empty()) 5953 return false; 5954 5955 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5956 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5957 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5958 ClassesWithUnmarkedVirtualMembers.pop_back(); 5959 MarkVirtualMembersReferenced(Loc, RD); 5960 } 5961 5962 return true; 5963} 5964 5965void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5966 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5967 e = RD->method_end(); i != e; ++i) { 5968 CXXMethodDecl *MD = *i; 5969 5970 // C++ [basic.def.odr]p2: 5971 // [...] A virtual member function is used if it is not pure. [...] 5972 if (MD->isVirtual() && !MD->isPure()) 5973 MarkDeclarationReferenced(Loc, MD); 5974 } 5975} 5976