SemaDeclCXX.cpp revision a3f8137d9f7cd1af7a6cbe736b9419f7eb99e86c
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 // We don't want access-control diagnostics here. 1080 R.suppressDiagnostics(); 1081 1082 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1083 bool NotUnknownSpecialization = false; 1084 DeclContext *DC = computeDeclContext(SS, false); 1085 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1086 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1087 1088 if (!NotUnknownSpecialization) { 1089 // When the scope specifier can refer to a member of an unknown 1090 // specialization, we take it as a type name. 1091 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1092 *MemberOrBase, SS.getRange()); 1093 if (BaseType.isNull()) 1094 return true; 1095 1096 R.clear(); 1097 } 1098 } 1099 1100 // If no results were found, try to correct typos. 1101 if (R.empty() && BaseType.isNull() && 1102 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1103 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1104 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1105 // We have found a non-static data member with a similar 1106 // name to what was typed; complain and initialize that 1107 // member. 1108 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1109 << MemberOrBase << true << R.getLookupName() 1110 << FixItHint::CreateReplacement(R.getNameLoc(), 1111 R.getLookupName().getAsString()); 1112 Diag(Member->getLocation(), diag::note_previous_decl) 1113 << Member->getDeclName(); 1114 1115 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1116 LParenLoc, RParenLoc); 1117 } 1118 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1119 const CXXBaseSpecifier *DirectBaseSpec; 1120 const CXXBaseSpecifier *VirtualBaseSpec; 1121 if (FindBaseInitializer(*this, ClassDecl, 1122 Context.getTypeDeclType(Type), 1123 DirectBaseSpec, VirtualBaseSpec)) { 1124 // We have found a direct or virtual base class with a 1125 // similar name to what was typed; complain and initialize 1126 // that base class. 1127 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1128 << MemberOrBase << false << R.getLookupName() 1129 << FixItHint::CreateReplacement(R.getNameLoc(), 1130 R.getLookupName().getAsString()); 1131 1132 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1133 : VirtualBaseSpec; 1134 Diag(BaseSpec->getSourceRange().getBegin(), 1135 diag::note_base_class_specified_here) 1136 << BaseSpec->getType() 1137 << BaseSpec->getSourceRange(); 1138 1139 TyD = Type; 1140 } 1141 } 1142 } 1143 1144 if (!TyD && BaseType.isNull()) { 1145 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1146 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1147 return true; 1148 } 1149 } 1150 1151 if (BaseType.isNull()) { 1152 BaseType = Context.getTypeDeclType(TyD); 1153 if (SS.isSet()) { 1154 NestedNameSpecifier *Qualifier = 1155 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1156 1157 // FIXME: preserve source range information 1158 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1159 } 1160 } 1161 } 1162 1163 if (!TInfo) 1164 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1165 1166 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1167 LParenLoc, RParenLoc, ClassDecl); 1168} 1169 1170/// Checks an initializer expression for use of uninitialized fields, such as 1171/// containing the field that is being initialized. Returns true if there is an 1172/// uninitialized field was used an updates the SourceLocation parameter; false 1173/// otherwise. 1174static bool InitExprContainsUninitializedFields(const Stmt* S, 1175 const FieldDecl* LhsField, 1176 SourceLocation* L) { 1177 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1178 if (ME) { 1179 const NamedDecl* RhsField = ME->getMemberDecl(); 1180 if (RhsField == LhsField) { 1181 // Initializing a field with itself. Throw a warning. 1182 // But wait; there are exceptions! 1183 // Exception #1: The field may not belong to this record. 1184 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1185 const Expr* base = ME->getBase(); 1186 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1187 // Even though the field matches, it does not belong to this record. 1188 return false; 1189 } 1190 // None of the exceptions triggered; return true to indicate an 1191 // uninitialized field was used. 1192 *L = ME->getMemberLoc(); 1193 return true; 1194 } 1195 } 1196 bool found = false; 1197 for (Stmt::const_child_iterator it = S->child_begin(); 1198 it != S->child_end() && found == false; 1199 ++it) { 1200 if (isa<CallExpr>(S)) { 1201 // Do not descend into function calls or constructors, as the use 1202 // of an uninitialized field may be valid. One would have to inspect 1203 // the contents of the function/ctor to determine if it is safe or not. 1204 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1205 // may be safe, depending on what the function/ctor does. 1206 continue; 1207 } 1208 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1209 } 1210 return found; 1211} 1212 1213Sema::MemInitResult 1214Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1215 unsigned NumArgs, SourceLocation IdLoc, 1216 SourceLocation LParenLoc, 1217 SourceLocation RParenLoc) { 1218 // Diagnose value-uses of fields to initialize themselves, e.g. 1219 // foo(foo) 1220 // where foo is not also a parameter to the constructor. 1221 // TODO: implement -Wuninitialized and fold this into that framework. 1222 for (unsigned i = 0; i < NumArgs; ++i) { 1223 SourceLocation L; 1224 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1225 // FIXME: Return true in the case when other fields are used before being 1226 // uninitialized. For example, let this field be the i'th field. When 1227 // initializing the i'th field, throw a warning if any of the >= i'th 1228 // fields are used, as they are not yet initialized. 1229 // Right now we are only handling the case where the i'th field uses 1230 // itself in its initializer. 1231 Diag(L, diag::warn_field_is_uninit); 1232 } 1233 } 1234 1235 bool HasDependentArg = false; 1236 for (unsigned i = 0; i < NumArgs; i++) 1237 HasDependentArg |= Args[i]->isTypeDependent(); 1238 1239 QualType FieldType = Member->getType(); 1240 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1241 FieldType = Array->getElementType(); 1242 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1243 if (FieldType->isDependentType() || HasDependentArg) { 1244 // Can't check initialization for a member of dependent type or when 1245 // any of the arguments are type-dependent expressions. 1246 OwningExprResult Init 1247 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1248 RParenLoc)); 1249 1250 // Erase any temporaries within this evaluation context; we're not 1251 // going to track them in the AST, since we'll be rebuilding the 1252 // ASTs during template instantiation. 1253 ExprTemporaries.erase( 1254 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1255 ExprTemporaries.end()); 1256 1257 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1258 LParenLoc, 1259 Init.takeAs<Expr>(), 1260 RParenLoc); 1261 1262 } 1263 1264 if (Member->isInvalidDecl()) 1265 return true; 1266 1267 // Initialize the member. 1268 InitializedEntity MemberEntity = 1269 InitializedEntity::InitializeMember(Member, 0); 1270 InitializationKind Kind = 1271 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1272 1273 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1274 1275 OwningExprResult MemberInit = 1276 InitSeq.Perform(*this, MemberEntity, Kind, 1277 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1278 if (MemberInit.isInvalid()) 1279 return true; 1280 1281 // C++0x [class.base.init]p7: 1282 // The initialization of each base and member constitutes a 1283 // full-expression. 1284 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1285 if (MemberInit.isInvalid()) 1286 return true; 1287 1288 // If we are in a dependent context, template instantiation will 1289 // perform this type-checking again. Just save the arguments that we 1290 // received in a ParenListExpr. 1291 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1292 // of the information that we have about the member 1293 // initializer. However, deconstructing the ASTs is a dicey process, 1294 // and this approach is far more likely to get the corner cases right. 1295 if (CurContext->isDependentContext()) { 1296 // Bump the reference count of all of the arguments. 1297 for (unsigned I = 0; I != NumArgs; ++I) 1298 Args[I]->Retain(); 1299 1300 OwningExprResult Init 1301 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1302 RParenLoc)); 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init.takeAs<Expr>(), 1306 RParenLoc); 1307 } 1308 1309 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1310 LParenLoc, 1311 MemberInit.takeAs<Expr>(), 1312 RParenLoc); 1313} 1314 1315Sema::MemInitResult 1316Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1317 Expr **Args, unsigned NumArgs, 1318 SourceLocation LParenLoc, SourceLocation RParenLoc, 1319 CXXRecordDecl *ClassDecl) { 1320 bool HasDependentArg = false; 1321 for (unsigned i = 0; i < NumArgs; i++) 1322 HasDependentArg |= Args[i]->isTypeDependent(); 1323 1324 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1325 if (BaseType->isDependentType() || HasDependentArg) { 1326 // Can't check initialization for a base of dependent type or when 1327 // any of the arguments are type-dependent expressions. 1328 OwningExprResult BaseInit 1329 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1330 RParenLoc)); 1331 1332 // Erase any temporaries within this evaluation context; we're not 1333 // going to track them in the AST, since we'll be rebuilding the 1334 // ASTs during template instantiation. 1335 ExprTemporaries.erase( 1336 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1337 ExprTemporaries.end()); 1338 1339 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1340 /*IsVirtual=*/false, 1341 LParenLoc, 1342 BaseInit.takeAs<Expr>(), 1343 RParenLoc); 1344 } 1345 1346 if (!BaseType->isRecordType()) 1347 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1348 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1349 1350 // C++ [class.base.init]p2: 1351 // [...] Unless the mem-initializer-id names a nonstatic data 1352 // member of the constructor’s class or a direct or virtual base 1353 // of that class, the mem-initializer is ill-formed. A 1354 // mem-initializer-list can initialize a base class using any 1355 // name that denotes that base class type. 1356 1357 // Check for direct and virtual base classes. 1358 const CXXBaseSpecifier *DirectBaseSpec = 0; 1359 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1360 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1361 VirtualBaseSpec); 1362 1363 // C++ [base.class.init]p2: 1364 // If a mem-initializer-id is ambiguous because it designates both 1365 // a direct non-virtual base class and an inherited virtual base 1366 // class, the mem-initializer is ill-formed. 1367 if (DirectBaseSpec && VirtualBaseSpec) 1368 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1369 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1370 // C++ [base.class.init]p2: 1371 // Unless the mem-initializer-id names a nonstatic data membeer of the 1372 // constructor's class ot a direst or virtual base of that class, the 1373 // mem-initializer is ill-formed. 1374 if (!DirectBaseSpec && !VirtualBaseSpec) 1375 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1376 << BaseType << ClassDecl->getNameAsCString() 1377 << BaseTInfo->getTypeLoc().getSourceRange(); 1378 1379 CXXBaseSpecifier *BaseSpec 1380 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1381 if (!BaseSpec) 1382 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1383 1384 // Initialize the base. 1385 InitializedEntity BaseEntity = 1386 InitializedEntity::InitializeBase(Context, BaseSpec); 1387 InitializationKind Kind = 1388 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1389 1390 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1391 1392 OwningExprResult BaseInit = 1393 InitSeq.Perform(*this, BaseEntity, Kind, 1394 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1395 if (BaseInit.isInvalid()) 1396 return true; 1397 1398 // C++0x [class.base.init]p7: 1399 // The initialization of each base and member constitutes a 1400 // full-expression. 1401 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1402 if (BaseInit.isInvalid()) 1403 return true; 1404 1405 // If we are in a dependent context, template instantiation will 1406 // perform this type-checking again. Just save the arguments that we 1407 // received in a ParenListExpr. 1408 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1409 // of the information that we have about the base 1410 // initializer. However, deconstructing the ASTs is a dicey process, 1411 // and this approach is far more likely to get the corner cases right. 1412 if (CurContext->isDependentContext()) { 1413 // Bump the reference count of all of the arguments. 1414 for (unsigned I = 0; I != NumArgs; ++I) 1415 Args[I]->Retain(); 1416 1417 OwningExprResult Init 1418 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1419 RParenLoc)); 1420 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1421 BaseSpec->isVirtual(), 1422 LParenLoc, 1423 Init.takeAs<Expr>(), 1424 RParenLoc); 1425 } 1426 1427 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1428 BaseSpec->isVirtual(), 1429 LParenLoc, 1430 BaseInit.takeAs<Expr>(), 1431 RParenLoc); 1432} 1433 1434bool 1435Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1436 CXXBaseOrMemberInitializer **Initializers, 1437 unsigned NumInitializers, 1438 bool AnyErrors) { 1439 if (Constructor->getDeclContext()->isDependentContext()) { 1440 // Just store the initializers as written, they will be checked during 1441 // instantiation. 1442 if (NumInitializers > 0) { 1443 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1444 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1445 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1446 memcpy(baseOrMemberInitializers, Initializers, 1447 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1448 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1449 } 1450 1451 return false; 1452 } 1453 1454 // We need to build the initializer AST according to order of construction 1455 // and not what user specified in the Initializers list. 1456 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1457 if (!ClassDecl) 1458 return true; 1459 1460 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1461 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1462 bool HadError = false; 1463 1464 for (unsigned i = 0; i < NumInitializers; i++) { 1465 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1466 1467 if (Member->isBaseInitializer()) 1468 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1469 else 1470 AllBaseFields[Member->getMember()] = Member; 1471 } 1472 1473 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1474 1475 // Push virtual bases before others. 1476 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1477 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1478 1479 if (CXXBaseOrMemberInitializer *Value 1480 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1481 AllToInit.push_back(Value); 1482 } else if (!AnyErrors) { 1483 InitializedEntity InitEntity 1484 = InitializedEntity::InitializeBase(Context, VBase); 1485 InitializationKind InitKind 1486 = InitializationKind::CreateDefault(Constructor->getLocation()); 1487 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1488 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1489 MultiExprArg(*this, 0, 0)); 1490 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1491 if (BaseInit.isInvalid()) { 1492 HadError = true; 1493 continue; 1494 } 1495 1496 CXXBaseOrMemberInitializer *CXXBaseInit = 1497 new (Context) CXXBaseOrMemberInitializer(Context, 1498 Context.getTrivialTypeSourceInfo(VBase->getType(), 1499 SourceLocation()), 1500 /*IsVirtual=*/true, 1501 SourceLocation(), 1502 BaseInit.takeAs<Expr>(), 1503 SourceLocation()); 1504 AllToInit.push_back(CXXBaseInit); 1505 } 1506 } 1507 1508 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1509 E = ClassDecl->bases_end(); Base != E; ++Base) { 1510 // Virtuals are in the virtual base list and already constructed. 1511 if (Base->isVirtual()) 1512 continue; 1513 1514 if (CXXBaseOrMemberInitializer *Value 1515 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1516 AllToInit.push_back(Value); 1517 } else if (!AnyErrors) { 1518 InitializedEntity InitEntity 1519 = InitializedEntity::InitializeBase(Context, Base); 1520 InitializationKind InitKind 1521 = InitializationKind::CreateDefault(Constructor->getLocation()); 1522 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1523 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1524 MultiExprArg(*this, 0, 0)); 1525 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1526 if (BaseInit.isInvalid()) { 1527 HadError = true; 1528 continue; 1529 } 1530 1531 CXXBaseOrMemberInitializer *CXXBaseInit = 1532 new (Context) CXXBaseOrMemberInitializer(Context, 1533 Context.getTrivialTypeSourceInfo(Base->getType(), 1534 SourceLocation()), 1535 /*IsVirtual=*/false, 1536 SourceLocation(), 1537 BaseInit.takeAs<Expr>(), 1538 SourceLocation()); 1539 AllToInit.push_back(CXXBaseInit); 1540 } 1541 } 1542 1543 // non-static data members. 1544 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1545 E = ClassDecl->field_end(); Field != E; ++Field) { 1546 if ((*Field)->isAnonymousStructOrUnion()) { 1547 if (const RecordType *FieldClassType = 1548 Field->getType()->getAs<RecordType>()) { 1549 CXXRecordDecl *FieldClassDecl 1550 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1551 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1552 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1553 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1554 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1555 // set to the anonymous union data member used in the initializer 1556 // list. 1557 Value->setMember(*Field); 1558 Value->setAnonUnionMember(*FA); 1559 AllToInit.push_back(Value); 1560 break; 1561 } 1562 } 1563 } 1564 continue; 1565 } 1566 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1567 AllToInit.push_back(Value); 1568 continue; 1569 } 1570 1571 if ((*Field)->getType()->isDependentType() || AnyErrors) 1572 continue; 1573 1574 QualType FT = Context.getBaseElementType((*Field)->getType()); 1575 if (FT->getAs<RecordType>()) { 1576 InitializedEntity InitEntity 1577 = InitializedEntity::InitializeMember(*Field); 1578 InitializationKind InitKind 1579 = InitializationKind::CreateDefault(Constructor->getLocation()); 1580 1581 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1582 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1583 MultiExprArg(*this, 0, 0)); 1584 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1585 if (MemberInit.isInvalid()) { 1586 HadError = true; 1587 continue; 1588 } 1589 1590 // Don't attach synthesized member initializers in a dependent 1591 // context; they'll be regenerated a template instantiation 1592 // time. 1593 if (CurContext->isDependentContext()) 1594 continue; 1595 1596 CXXBaseOrMemberInitializer *Member = 1597 new (Context) CXXBaseOrMemberInitializer(Context, 1598 *Field, SourceLocation(), 1599 SourceLocation(), 1600 MemberInit.takeAs<Expr>(), 1601 SourceLocation()); 1602 1603 AllToInit.push_back(Member); 1604 } 1605 else if (FT->isReferenceType()) { 1606 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1607 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1608 << 0 << (*Field)->getDeclName(); 1609 Diag((*Field)->getLocation(), diag::note_declared_at); 1610 HadError = true; 1611 } 1612 else if (FT.isConstQualified()) { 1613 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1614 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1615 << 1 << (*Field)->getDeclName(); 1616 Diag((*Field)->getLocation(), diag::note_declared_at); 1617 HadError = true; 1618 } 1619 } 1620 1621 NumInitializers = AllToInit.size(); 1622 if (NumInitializers > 0) { 1623 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1624 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1625 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1626 memcpy(baseOrMemberInitializers, AllToInit.data(), 1627 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1628 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1629 1630 // Constructors implicitly reference the base and member 1631 // destructors. 1632 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1633 Constructor->getParent()); 1634 } 1635 1636 return HadError; 1637} 1638 1639static void *GetKeyForTopLevelField(FieldDecl *Field) { 1640 // For anonymous unions, use the class declaration as the key. 1641 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1642 if (RT->getDecl()->isAnonymousStructOrUnion()) 1643 return static_cast<void *>(RT->getDecl()); 1644 } 1645 return static_cast<void *>(Field); 1646} 1647 1648static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1649 return Context.getCanonicalType(BaseType).getTypePtr(); 1650} 1651 1652static void *GetKeyForMember(ASTContext &Context, 1653 CXXBaseOrMemberInitializer *Member, 1654 bool MemberMaybeAnon = false) { 1655 if (!Member->isMemberInitializer()) 1656 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1657 1658 // For fields injected into the class via declaration of an anonymous union, 1659 // use its anonymous union class declaration as the unique key. 1660 FieldDecl *Field = Member->getMember(); 1661 1662 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1663 // data member of the class. Data member used in the initializer list is 1664 // in AnonUnionMember field. 1665 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1666 Field = Member->getAnonUnionMember(); 1667 1668 // If the field is a member of an anonymous struct or union, our key 1669 // is the anonymous record decl that's a direct child of the class. 1670 RecordDecl *RD = Field->getParent(); 1671 if (RD->isAnonymousStructOrUnion()) { 1672 while (true) { 1673 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1674 if (Parent->isAnonymousStructOrUnion()) 1675 RD = Parent; 1676 else 1677 break; 1678 } 1679 1680 return static_cast<void *>(RD); 1681 } 1682 1683 return static_cast<void *>(Field); 1684} 1685 1686static void 1687DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1688 const CXXConstructorDecl *Constructor, 1689 CXXBaseOrMemberInitializer **Inits, 1690 unsigned NumInits) { 1691 if (Constructor->getDeclContext()->isDependentContext()) 1692 return; 1693 1694 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1695 == Diagnostic::Ignored) 1696 return; 1697 1698 // Build the list of bases and members in the order that they'll 1699 // actually be initialized. The explicit initializers should be in 1700 // this same order but may be missing things. 1701 llvm::SmallVector<const void*, 32> IdealInitKeys; 1702 1703 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1704 1705 // 1. Virtual bases. 1706 for (CXXRecordDecl::base_class_const_iterator VBase = 1707 ClassDecl->vbases_begin(), 1708 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1709 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1710 1711 // 2. Non-virtual bases. 1712 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1713 E = ClassDecl->bases_end(); Base != E; ++Base) { 1714 if (Base->isVirtual()) 1715 continue; 1716 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1717 } 1718 1719 // 3. Direct fields. 1720 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1721 E = ClassDecl->field_end(); Field != E; ++Field) 1722 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1723 1724 unsigned NumIdealInits = IdealInitKeys.size(); 1725 unsigned IdealIndex = 0; 1726 1727 CXXBaseOrMemberInitializer *PrevInit = 0; 1728 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1729 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1730 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1731 1732 // Scan forward to try to find this initializer in the idealized 1733 // initializers list. 1734 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1735 if (InitKey == IdealInitKeys[IdealIndex]) 1736 break; 1737 1738 // If we didn't find this initializer, it must be because we 1739 // scanned past it on a previous iteration. That can only 1740 // happen if we're out of order; emit a warning. 1741 if (IdealIndex == NumIdealInits) { 1742 assert(PrevInit && "initializer not found in initializer list"); 1743 1744 Sema::SemaDiagnosticBuilder D = 1745 SemaRef.Diag(PrevInit->getSourceLocation(), 1746 diag::warn_initializer_out_of_order); 1747 1748 if (PrevInit->isMemberInitializer()) 1749 D << 0 << PrevInit->getMember()->getDeclName(); 1750 else 1751 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1752 1753 if (Init->isMemberInitializer()) 1754 D << 0 << Init->getMember()->getDeclName(); 1755 else 1756 D << 1 << Init->getBaseClassInfo()->getType(); 1757 1758 // Move back to the initializer's location in the ideal list. 1759 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1760 if (InitKey == IdealInitKeys[IdealIndex]) 1761 break; 1762 1763 assert(IdealIndex != NumIdealInits && 1764 "initializer not found in initializer list"); 1765 } 1766 1767 PrevInit = Init; 1768 } 1769} 1770 1771namespace { 1772bool CheckRedundantInit(Sema &S, 1773 CXXBaseOrMemberInitializer *Init, 1774 CXXBaseOrMemberInitializer *&PrevInit) { 1775 if (!PrevInit) { 1776 PrevInit = Init; 1777 return false; 1778 } 1779 1780 if (FieldDecl *Field = Init->getMember()) 1781 S.Diag(Init->getSourceLocation(), 1782 diag::err_multiple_mem_initialization) 1783 << Field->getDeclName() 1784 << Init->getSourceRange(); 1785 else { 1786 Type *BaseClass = Init->getBaseClass(); 1787 assert(BaseClass && "neither field nor base"); 1788 S.Diag(Init->getSourceLocation(), 1789 diag::err_multiple_base_initialization) 1790 << QualType(BaseClass, 0) 1791 << Init->getSourceRange(); 1792 } 1793 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1794 << 0 << PrevInit->getSourceRange(); 1795 1796 return true; 1797} 1798 1799typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1800typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1801 1802bool CheckRedundantUnionInit(Sema &S, 1803 CXXBaseOrMemberInitializer *Init, 1804 RedundantUnionMap &Unions) { 1805 FieldDecl *Field = Init->getMember(); 1806 RecordDecl *Parent = Field->getParent(); 1807 if (!Parent->isAnonymousStructOrUnion()) 1808 return false; 1809 1810 NamedDecl *Child = Field; 1811 do { 1812 if (Parent->isUnion()) { 1813 UnionEntry &En = Unions[Parent]; 1814 if (En.first && En.first != Child) { 1815 S.Diag(Init->getSourceLocation(), 1816 diag::err_multiple_mem_union_initialization) 1817 << Field->getDeclName() 1818 << Init->getSourceRange(); 1819 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1820 << 0 << En.second->getSourceRange(); 1821 return true; 1822 } else if (!En.first) { 1823 En.first = Child; 1824 En.second = Init; 1825 } 1826 } 1827 1828 Child = Parent; 1829 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1830 } while (Parent->isAnonymousStructOrUnion()); 1831 1832 return false; 1833} 1834} 1835 1836/// ActOnMemInitializers - Handle the member initializers for a constructor. 1837void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1838 SourceLocation ColonLoc, 1839 MemInitTy **meminits, unsigned NumMemInits, 1840 bool AnyErrors) { 1841 if (!ConstructorDecl) 1842 return; 1843 1844 AdjustDeclIfTemplate(ConstructorDecl); 1845 1846 CXXConstructorDecl *Constructor 1847 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1848 1849 if (!Constructor) { 1850 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1851 return; 1852 } 1853 1854 CXXBaseOrMemberInitializer **MemInits = 1855 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1856 1857 // Mapping for the duplicate initializers check. 1858 // For member initializers, this is keyed with a FieldDecl*. 1859 // For base initializers, this is keyed with a Type*. 1860 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1861 1862 // Mapping for the inconsistent anonymous-union initializers check. 1863 RedundantUnionMap MemberUnions; 1864 1865 bool HadError = false; 1866 for (unsigned i = 0; i < NumMemInits; i++) { 1867 CXXBaseOrMemberInitializer *Init = MemInits[i]; 1868 1869 if (Init->isMemberInitializer()) { 1870 FieldDecl *Field = Init->getMember(); 1871 if (CheckRedundantInit(*this, Init, Members[Field]) || 1872 CheckRedundantUnionInit(*this, Init, MemberUnions)) 1873 HadError = true; 1874 } else { 1875 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 1876 if (CheckRedundantInit(*this, Init, Members[Key])) 1877 HadError = true; 1878 } 1879 } 1880 1881 if (HadError) 1882 return; 1883 1884 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1885 1886 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1887} 1888 1889void 1890Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1891 CXXRecordDecl *ClassDecl) { 1892 // Ignore dependent contexts. 1893 if (ClassDecl->isDependentContext()) 1894 return; 1895 1896 // FIXME: all the access-control diagnostics are positioned on the 1897 // field/base declaration. That's probably good; that said, the 1898 // user might reasonably want to know why the destructor is being 1899 // emitted, and we currently don't say. 1900 1901 // Non-static data members. 1902 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1903 E = ClassDecl->field_end(); I != E; ++I) { 1904 FieldDecl *Field = *I; 1905 1906 QualType FieldType = Context.getBaseElementType(Field->getType()); 1907 1908 const RecordType* RT = FieldType->getAs<RecordType>(); 1909 if (!RT) 1910 continue; 1911 1912 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1913 if (FieldClassDecl->hasTrivialDestructor()) 1914 continue; 1915 1916 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1917 CheckDestructorAccess(Field->getLocation(), Dtor, 1918 PDiag(diag::err_access_dtor_field) 1919 << Field->getDeclName() 1920 << FieldType); 1921 1922 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1923 } 1924 1925 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1926 1927 // Bases. 1928 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1929 E = ClassDecl->bases_end(); Base != E; ++Base) { 1930 // Bases are always records in a well-formed non-dependent class. 1931 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1932 1933 // Remember direct virtual bases. 1934 if (Base->isVirtual()) 1935 DirectVirtualBases.insert(RT); 1936 1937 // Ignore trivial destructors. 1938 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1939 if (BaseClassDecl->hasTrivialDestructor()) 1940 continue; 1941 1942 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1943 1944 // FIXME: caret should be on the start of the class name 1945 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1946 PDiag(diag::err_access_dtor_base) 1947 << Base->getType() 1948 << Base->getSourceRange()); 1949 1950 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1951 } 1952 1953 // Virtual bases. 1954 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1955 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1956 1957 // Bases are always records in a well-formed non-dependent class. 1958 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1959 1960 // Ignore direct virtual bases. 1961 if (DirectVirtualBases.count(RT)) 1962 continue; 1963 1964 // Ignore trivial destructors. 1965 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1966 if (BaseClassDecl->hasTrivialDestructor()) 1967 continue; 1968 1969 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1970 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1971 PDiag(diag::err_access_dtor_vbase) 1972 << VBase->getType()); 1973 1974 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1975 } 1976} 1977 1978void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1979 if (!CDtorDecl) 1980 return; 1981 1982 if (CXXConstructorDecl *Constructor 1983 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1984 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 1985} 1986 1987bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1988 unsigned DiagID, AbstractDiagSelID SelID, 1989 const CXXRecordDecl *CurrentRD) { 1990 if (SelID == -1) 1991 return RequireNonAbstractType(Loc, T, 1992 PDiag(DiagID), CurrentRD); 1993 else 1994 return RequireNonAbstractType(Loc, T, 1995 PDiag(DiagID) << SelID, CurrentRD); 1996} 1997 1998bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1999 const PartialDiagnostic &PD, 2000 const CXXRecordDecl *CurrentRD) { 2001 if (!getLangOptions().CPlusPlus) 2002 return false; 2003 2004 if (const ArrayType *AT = Context.getAsArrayType(T)) 2005 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2006 CurrentRD); 2007 2008 if (const PointerType *PT = T->getAs<PointerType>()) { 2009 // Find the innermost pointer type. 2010 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2011 PT = T; 2012 2013 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2014 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2015 } 2016 2017 const RecordType *RT = T->getAs<RecordType>(); 2018 if (!RT) 2019 return false; 2020 2021 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2022 2023 if (CurrentRD && CurrentRD != RD) 2024 return false; 2025 2026 // FIXME: is this reasonable? It matches current behavior, but.... 2027 if (!RD->getDefinition()) 2028 return false; 2029 2030 if (!RD->isAbstract()) 2031 return false; 2032 2033 Diag(Loc, PD) << RD->getDeclName(); 2034 2035 // Check if we've already emitted the list of pure virtual functions for this 2036 // class. 2037 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2038 return true; 2039 2040 CXXFinalOverriderMap FinalOverriders; 2041 RD->getFinalOverriders(FinalOverriders); 2042 2043 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2044 MEnd = FinalOverriders.end(); 2045 M != MEnd; 2046 ++M) { 2047 for (OverridingMethods::iterator SO = M->second.begin(), 2048 SOEnd = M->second.end(); 2049 SO != SOEnd; ++SO) { 2050 // C++ [class.abstract]p4: 2051 // A class is abstract if it contains or inherits at least one 2052 // pure virtual function for which the final overrider is pure 2053 // virtual. 2054 2055 // 2056 if (SO->second.size() != 1) 2057 continue; 2058 2059 if (!SO->second.front().Method->isPure()) 2060 continue; 2061 2062 Diag(SO->second.front().Method->getLocation(), 2063 diag::note_pure_virtual_function) 2064 << SO->second.front().Method->getDeclName(); 2065 } 2066 } 2067 2068 if (!PureVirtualClassDiagSet) 2069 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2070 PureVirtualClassDiagSet->insert(RD); 2071 2072 return true; 2073} 2074 2075namespace { 2076 class AbstractClassUsageDiagnoser 2077 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2078 Sema &SemaRef; 2079 CXXRecordDecl *AbstractClass; 2080 2081 bool VisitDeclContext(const DeclContext *DC) { 2082 bool Invalid = false; 2083 2084 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2085 E = DC->decls_end(); I != E; ++I) 2086 Invalid |= Visit(*I); 2087 2088 return Invalid; 2089 } 2090 2091 public: 2092 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2093 : SemaRef(SemaRef), AbstractClass(ac) { 2094 Visit(SemaRef.Context.getTranslationUnitDecl()); 2095 } 2096 2097 bool VisitFunctionDecl(const FunctionDecl *FD) { 2098 if (FD->isThisDeclarationADefinition()) { 2099 // No need to do the check if we're in a definition, because it requires 2100 // that the return/param types are complete. 2101 // because that requires 2102 return VisitDeclContext(FD); 2103 } 2104 2105 // Check the return type. 2106 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2107 bool Invalid = 2108 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2109 diag::err_abstract_type_in_decl, 2110 Sema::AbstractReturnType, 2111 AbstractClass); 2112 2113 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2114 E = FD->param_end(); I != E; ++I) { 2115 const ParmVarDecl *VD = *I; 2116 Invalid |= 2117 SemaRef.RequireNonAbstractType(VD->getLocation(), 2118 VD->getOriginalType(), 2119 diag::err_abstract_type_in_decl, 2120 Sema::AbstractParamType, 2121 AbstractClass); 2122 } 2123 2124 return Invalid; 2125 } 2126 2127 bool VisitDecl(const Decl* D) { 2128 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2129 return VisitDeclContext(DC); 2130 2131 return false; 2132 } 2133 }; 2134} 2135 2136/// \brief Perform semantic checks on a class definition that has been 2137/// completing, introducing implicitly-declared members, checking for 2138/// abstract types, etc. 2139void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2140 if (!Record || Record->isInvalidDecl()) 2141 return; 2142 2143 if (!Record->isDependentType()) 2144 AddImplicitlyDeclaredMembersToClass(S, Record); 2145 2146 if (Record->isInvalidDecl()) 2147 return; 2148 2149 // Set access bits correctly on the directly-declared conversions. 2150 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2151 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2152 Convs->setAccess(I, (*I)->getAccess()); 2153 2154 // Determine whether we need to check for final overriders. We do 2155 // this either when there are virtual base classes (in which case we 2156 // may end up finding multiple final overriders for a given virtual 2157 // function) or any of the base classes is abstract (in which case 2158 // we might detect that this class is abstract). 2159 bool CheckFinalOverriders = false; 2160 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2161 !Record->isDependentType()) { 2162 if (Record->getNumVBases()) 2163 CheckFinalOverriders = true; 2164 else if (!Record->isAbstract()) { 2165 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2166 BEnd = Record->bases_end(); 2167 B != BEnd; ++B) { 2168 CXXRecordDecl *BaseDecl 2169 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2170 if (BaseDecl->isAbstract()) { 2171 CheckFinalOverriders = true; 2172 break; 2173 } 2174 } 2175 } 2176 } 2177 2178 if (CheckFinalOverriders) { 2179 CXXFinalOverriderMap FinalOverriders; 2180 Record->getFinalOverriders(FinalOverriders); 2181 2182 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2183 MEnd = FinalOverriders.end(); 2184 M != MEnd; ++M) { 2185 for (OverridingMethods::iterator SO = M->second.begin(), 2186 SOEnd = M->second.end(); 2187 SO != SOEnd; ++SO) { 2188 assert(SO->second.size() > 0 && 2189 "All virtual functions have overridding virtual functions"); 2190 if (SO->second.size() == 1) { 2191 // C++ [class.abstract]p4: 2192 // A class is abstract if it contains or inherits at least one 2193 // pure virtual function for which the final overrider is pure 2194 // virtual. 2195 if (SO->second.front().Method->isPure()) 2196 Record->setAbstract(true); 2197 continue; 2198 } 2199 2200 // C++ [class.virtual]p2: 2201 // In a derived class, if a virtual member function of a base 2202 // class subobject has more than one final overrider the 2203 // program is ill-formed. 2204 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2205 << (NamedDecl *)M->first << Record; 2206 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2207 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2208 OMEnd = SO->second.end(); 2209 OM != OMEnd; ++OM) 2210 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2211 << (NamedDecl *)M->first << OM->Method->getParent(); 2212 2213 Record->setInvalidDecl(); 2214 } 2215 } 2216 } 2217 2218 if (Record->isAbstract() && !Record->isInvalidDecl()) 2219 (void)AbstractClassUsageDiagnoser(*this, Record); 2220} 2221 2222void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2223 DeclPtrTy TagDecl, 2224 SourceLocation LBrac, 2225 SourceLocation RBrac, 2226 AttributeList *AttrList) { 2227 if (!TagDecl) 2228 return; 2229 2230 AdjustDeclIfTemplate(TagDecl); 2231 2232 ActOnFields(S, RLoc, TagDecl, 2233 (DeclPtrTy*)FieldCollector->getCurFields(), 2234 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2235 2236 CheckCompletedCXXClass(S, 2237 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2238} 2239 2240/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2241/// special functions, such as the default constructor, copy 2242/// constructor, or destructor, to the given C++ class (C++ 2243/// [special]p1). This routine can only be executed just before the 2244/// definition of the class is complete. 2245/// 2246/// The scope, if provided, is the class scope. 2247void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2248 CXXRecordDecl *ClassDecl) { 2249 CanQualType ClassType 2250 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2251 2252 // FIXME: Implicit declarations have exception specifications, which are 2253 // the union of the specifications of the implicitly called functions. 2254 2255 if (!ClassDecl->hasUserDeclaredConstructor()) { 2256 // C++ [class.ctor]p5: 2257 // A default constructor for a class X is a constructor of class X 2258 // that can be called without an argument. If there is no 2259 // user-declared constructor for class X, a default constructor is 2260 // implicitly declared. An implicitly-declared default constructor 2261 // is an inline public member of its class. 2262 DeclarationName Name 2263 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2264 CXXConstructorDecl *DefaultCon = 2265 CXXConstructorDecl::Create(Context, ClassDecl, 2266 ClassDecl->getLocation(), Name, 2267 Context.getFunctionType(Context.VoidTy, 2268 0, 0, false, 0, 2269 /*FIXME*/false, false, 2270 0, 0, 2271 FunctionType::ExtInfo()), 2272 /*TInfo=*/0, 2273 /*isExplicit=*/false, 2274 /*isInline=*/true, 2275 /*isImplicitlyDeclared=*/true); 2276 DefaultCon->setAccess(AS_public); 2277 DefaultCon->setImplicit(); 2278 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2279 if (S) 2280 PushOnScopeChains(DefaultCon, S, true); 2281 else 2282 ClassDecl->addDecl(DefaultCon); 2283 } 2284 2285 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2286 // C++ [class.copy]p4: 2287 // If the class definition does not explicitly declare a copy 2288 // constructor, one is declared implicitly. 2289 2290 // C++ [class.copy]p5: 2291 // The implicitly-declared copy constructor for a class X will 2292 // have the form 2293 // 2294 // X::X(const X&) 2295 // 2296 // if 2297 bool HasConstCopyConstructor = true; 2298 2299 // -- each direct or virtual base class B of X has a copy 2300 // constructor whose first parameter is of type const B& or 2301 // const volatile B&, and 2302 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2303 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2304 const CXXRecordDecl *BaseClassDecl 2305 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2306 HasConstCopyConstructor 2307 = BaseClassDecl->hasConstCopyConstructor(Context); 2308 } 2309 2310 // -- for all the nonstatic data members of X that are of a 2311 // class type M (or array thereof), each such class type 2312 // has a copy constructor whose first parameter is of type 2313 // const M& or const volatile M&. 2314 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2315 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2316 ++Field) { 2317 QualType FieldType = (*Field)->getType(); 2318 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2319 FieldType = Array->getElementType(); 2320 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2321 const CXXRecordDecl *FieldClassDecl 2322 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2323 HasConstCopyConstructor 2324 = FieldClassDecl->hasConstCopyConstructor(Context); 2325 } 2326 } 2327 2328 // Otherwise, the implicitly declared copy constructor will have 2329 // the form 2330 // 2331 // X::X(X&) 2332 QualType ArgType = ClassType; 2333 if (HasConstCopyConstructor) 2334 ArgType = ArgType.withConst(); 2335 ArgType = Context.getLValueReferenceType(ArgType); 2336 2337 // An implicitly-declared copy constructor is an inline public 2338 // member of its class. 2339 DeclarationName Name 2340 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2341 CXXConstructorDecl *CopyConstructor 2342 = CXXConstructorDecl::Create(Context, ClassDecl, 2343 ClassDecl->getLocation(), Name, 2344 Context.getFunctionType(Context.VoidTy, 2345 &ArgType, 1, 2346 false, 0, 2347 /*FIXME:*/false, 2348 false, 0, 0, 2349 FunctionType::ExtInfo()), 2350 /*TInfo=*/0, 2351 /*isExplicit=*/false, 2352 /*isInline=*/true, 2353 /*isImplicitlyDeclared=*/true); 2354 CopyConstructor->setAccess(AS_public); 2355 CopyConstructor->setImplicit(); 2356 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2357 2358 // Add the parameter to the constructor. 2359 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2360 ClassDecl->getLocation(), 2361 /*IdentifierInfo=*/0, 2362 ArgType, /*TInfo=*/0, 2363 VarDecl::None, 0); 2364 CopyConstructor->setParams(&FromParam, 1); 2365 if (S) 2366 PushOnScopeChains(CopyConstructor, S, true); 2367 else 2368 ClassDecl->addDecl(CopyConstructor); 2369 } 2370 2371 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2372 // Note: The following rules are largely analoguous to the copy 2373 // constructor rules. Note that virtual bases are not taken into account 2374 // for determining the argument type of the operator. Note also that 2375 // operators taking an object instead of a reference are allowed. 2376 // 2377 // C++ [class.copy]p10: 2378 // If the class definition does not explicitly declare a copy 2379 // assignment operator, one is declared implicitly. 2380 // The implicitly-defined copy assignment operator for a class X 2381 // will have the form 2382 // 2383 // X& X::operator=(const X&) 2384 // 2385 // if 2386 bool HasConstCopyAssignment = true; 2387 2388 // -- each direct base class B of X has a copy assignment operator 2389 // whose parameter is of type const B&, const volatile B& or B, 2390 // and 2391 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2392 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2393 assert(!Base->getType()->isDependentType() && 2394 "Cannot generate implicit members for class with dependent bases."); 2395 const CXXRecordDecl *BaseClassDecl 2396 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2397 const CXXMethodDecl *MD = 0; 2398 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2399 MD); 2400 } 2401 2402 // -- for all the nonstatic data members of X that are of a class 2403 // type M (or array thereof), each such class type has a copy 2404 // assignment operator whose parameter is of type const M&, 2405 // const volatile M& or M. 2406 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2407 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2408 ++Field) { 2409 QualType FieldType = (*Field)->getType(); 2410 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2411 FieldType = Array->getElementType(); 2412 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2413 const CXXRecordDecl *FieldClassDecl 2414 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2415 const CXXMethodDecl *MD = 0; 2416 HasConstCopyAssignment 2417 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2418 } 2419 } 2420 2421 // Otherwise, the implicitly declared copy assignment operator will 2422 // have the form 2423 // 2424 // X& X::operator=(X&) 2425 QualType ArgType = ClassType; 2426 QualType RetType = Context.getLValueReferenceType(ArgType); 2427 if (HasConstCopyAssignment) 2428 ArgType = ArgType.withConst(); 2429 ArgType = Context.getLValueReferenceType(ArgType); 2430 2431 // An implicitly-declared copy assignment operator is an inline public 2432 // member of its class. 2433 DeclarationName Name = 2434 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2435 CXXMethodDecl *CopyAssignment = 2436 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2437 Context.getFunctionType(RetType, &ArgType, 1, 2438 false, 0, 2439 /*FIXME:*/false, 2440 false, 0, 0, 2441 FunctionType::ExtInfo()), 2442 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2443 CopyAssignment->setAccess(AS_public); 2444 CopyAssignment->setImplicit(); 2445 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2446 CopyAssignment->setCopyAssignment(true); 2447 2448 // Add the parameter to the operator. 2449 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2450 ClassDecl->getLocation(), 2451 /*IdentifierInfo=*/0, 2452 ArgType, /*TInfo=*/0, 2453 VarDecl::None, 0); 2454 CopyAssignment->setParams(&FromParam, 1); 2455 2456 // Don't call addedAssignmentOperator. There is no way to distinguish an 2457 // implicit from an explicit assignment operator. 2458 if (S) 2459 PushOnScopeChains(CopyAssignment, S, true); 2460 else 2461 ClassDecl->addDecl(CopyAssignment); 2462 AddOverriddenMethods(ClassDecl, CopyAssignment); 2463 } 2464 2465 if (!ClassDecl->hasUserDeclaredDestructor()) { 2466 // C++ [class.dtor]p2: 2467 // If a class has no user-declared destructor, a destructor is 2468 // declared implicitly. An implicitly-declared destructor is an 2469 // inline public member of its class. 2470 QualType Ty = Context.getFunctionType(Context.VoidTy, 2471 0, 0, false, 0, 2472 /*FIXME:*/false, 2473 false, 0, 0, FunctionType::ExtInfo()); 2474 2475 DeclarationName Name 2476 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2477 CXXDestructorDecl *Destructor 2478 = CXXDestructorDecl::Create(Context, ClassDecl, 2479 ClassDecl->getLocation(), Name, Ty, 2480 /*isInline=*/true, 2481 /*isImplicitlyDeclared=*/true); 2482 Destructor->setAccess(AS_public); 2483 Destructor->setImplicit(); 2484 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2485 if (S) 2486 PushOnScopeChains(Destructor, S, true); 2487 else 2488 ClassDecl->addDecl(Destructor); 2489 2490 // This could be uniqued if it ever proves significant. 2491 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2492 2493 AddOverriddenMethods(ClassDecl, Destructor); 2494 } 2495} 2496 2497void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2498 Decl *D = TemplateD.getAs<Decl>(); 2499 if (!D) 2500 return; 2501 2502 TemplateParameterList *Params = 0; 2503 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2504 Params = Template->getTemplateParameters(); 2505 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2506 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2507 Params = PartialSpec->getTemplateParameters(); 2508 else 2509 return; 2510 2511 for (TemplateParameterList::iterator Param = Params->begin(), 2512 ParamEnd = Params->end(); 2513 Param != ParamEnd; ++Param) { 2514 NamedDecl *Named = cast<NamedDecl>(*Param); 2515 if (Named->getDeclName()) { 2516 S->AddDecl(DeclPtrTy::make(Named)); 2517 IdResolver.AddDecl(Named); 2518 } 2519 } 2520} 2521 2522void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2523 if (!RecordD) return; 2524 AdjustDeclIfTemplate(RecordD); 2525 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2526 PushDeclContext(S, Record); 2527} 2528 2529void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2530 if (!RecordD) return; 2531 PopDeclContext(); 2532} 2533 2534/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2535/// parsing a top-level (non-nested) C++ class, and we are now 2536/// parsing those parts of the given Method declaration that could 2537/// not be parsed earlier (C++ [class.mem]p2), such as default 2538/// arguments. This action should enter the scope of the given 2539/// Method declaration as if we had just parsed the qualified method 2540/// name. However, it should not bring the parameters into scope; 2541/// that will be performed by ActOnDelayedCXXMethodParameter. 2542void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2543} 2544 2545/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2546/// C++ method declaration. We're (re-)introducing the given 2547/// function parameter into scope for use in parsing later parts of 2548/// the method declaration. For example, we could see an 2549/// ActOnParamDefaultArgument event for this parameter. 2550void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2551 if (!ParamD) 2552 return; 2553 2554 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2555 2556 // If this parameter has an unparsed default argument, clear it out 2557 // to make way for the parsed default argument. 2558 if (Param->hasUnparsedDefaultArg()) 2559 Param->setDefaultArg(0); 2560 2561 S->AddDecl(DeclPtrTy::make(Param)); 2562 if (Param->getDeclName()) 2563 IdResolver.AddDecl(Param); 2564} 2565 2566/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2567/// processing the delayed method declaration for Method. The method 2568/// declaration is now considered finished. There may be a separate 2569/// ActOnStartOfFunctionDef action later (not necessarily 2570/// immediately!) for this method, if it was also defined inside the 2571/// class body. 2572void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2573 if (!MethodD) 2574 return; 2575 2576 AdjustDeclIfTemplate(MethodD); 2577 2578 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2579 2580 // Now that we have our default arguments, check the constructor 2581 // again. It could produce additional diagnostics or affect whether 2582 // the class has implicitly-declared destructors, among other 2583 // things. 2584 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2585 CheckConstructor(Constructor); 2586 2587 // Check the default arguments, which we may have added. 2588 if (!Method->isInvalidDecl()) 2589 CheckCXXDefaultArguments(Method); 2590} 2591 2592/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2593/// the well-formedness of the constructor declarator @p D with type @p 2594/// R. If there are any errors in the declarator, this routine will 2595/// emit diagnostics and set the invalid bit to true. In any case, the type 2596/// will be updated to reflect a well-formed type for the constructor and 2597/// returned. 2598QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2599 FunctionDecl::StorageClass &SC) { 2600 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2601 2602 // C++ [class.ctor]p3: 2603 // A constructor shall not be virtual (10.3) or static (9.4). A 2604 // constructor can be invoked for a const, volatile or const 2605 // volatile object. A constructor shall not be declared const, 2606 // volatile, or const volatile (9.3.2). 2607 if (isVirtual) { 2608 if (!D.isInvalidType()) 2609 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2610 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2611 << SourceRange(D.getIdentifierLoc()); 2612 D.setInvalidType(); 2613 } 2614 if (SC == FunctionDecl::Static) { 2615 if (!D.isInvalidType()) 2616 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2617 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2618 << SourceRange(D.getIdentifierLoc()); 2619 D.setInvalidType(); 2620 SC = FunctionDecl::None; 2621 } 2622 2623 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2624 if (FTI.TypeQuals != 0) { 2625 if (FTI.TypeQuals & Qualifiers::Const) 2626 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2627 << "const" << SourceRange(D.getIdentifierLoc()); 2628 if (FTI.TypeQuals & Qualifiers::Volatile) 2629 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2630 << "volatile" << SourceRange(D.getIdentifierLoc()); 2631 if (FTI.TypeQuals & Qualifiers::Restrict) 2632 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2633 << "restrict" << SourceRange(D.getIdentifierLoc()); 2634 } 2635 2636 // Rebuild the function type "R" without any type qualifiers (in 2637 // case any of the errors above fired) and with "void" as the 2638 // return type, since constructors don't have return types. We 2639 // *always* have to do this, because GetTypeForDeclarator will 2640 // put in a result type of "int" when none was specified. 2641 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2642 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2643 Proto->getNumArgs(), 2644 Proto->isVariadic(), 0, 2645 Proto->hasExceptionSpec(), 2646 Proto->hasAnyExceptionSpec(), 2647 Proto->getNumExceptions(), 2648 Proto->exception_begin(), 2649 Proto->getExtInfo()); 2650} 2651 2652/// CheckConstructor - Checks a fully-formed constructor for 2653/// well-formedness, issuing any diagnostics required. Returns true if 2654/// the constructor declarator is invalid. 2655void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2656 CXXRecordDecl *ClassDecl 2657 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2658 if (!ClassDecl) 2659 return Constructor->setInvalidDecl(); 2660 2661 // C++ [class.copy]p3: 2662 // A declaration of a constructor for a class X is ill-formed if 2663 // its first parameter is of type (optionally cv-qualified) X and 2664 // either there are no other parameters or else all other 2665 // parameters have default arguments. 2666 if (!Constructor->isInvalidDecl() && 2667 ((Constructor->getNumParams() == 1) || 2668 (Constructor->getNumParams() > 1 && 2669 Constructor->getParamDecl(1)->hasDefaultArg())) && 2670 Constructor->getTemplateSpecializationKind() 2671 != TSK_ImplicitInstantiation) { 2672 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2673 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2674 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2675 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2676 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2677 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2678 2679 // FIXME: Rather that making the constructor invalid, we should endeavor 2680 // to fix the type. 2681 Constructor->setInvalidDecl(); 2682 } 2683 } 2684 2685 // Notify the class that we've added a constructor. 2686 ClassDecl->addedConstructor(Context, Constructor); 2687} 2688 2689/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2690/// issuing any diagnostics required. Returns true on error. 2691bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2692 CXXRecordDecl *RD = Destructor->getParent(); 2693 2694 if (Destructor->isVirtual()) { 2695 SourceLocation Loc; 2696 2697 if (!Destructor->isImplicit()) 2698 Loc = Destructor->getLocation(); 2699 else 2700 Loc = RD->getLocation(); 2701 2702 // If we have a virtual destructor, look up the deallocation function 2703 FunctionDecl *OperatorDelete = 0; 2704 DeclarationName Name = 2705 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2706 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2707 return true; 2708 2709 Destructor->setOperatorDelete(OperatorDelete); 2710 } 2711 2712 return false; 2713} 2714 2715static inline bool 2716FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2717 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2718 FTI.ArgInfo[0].Param && 2719 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2720} 2721 2722/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2723/// the well-formednes of the destructor declarator @p D with type @p 2724/// R. If there are any errors in the declarator, this routine will 2725/// emit diagnostics and set the declarator to invalid. Even if this happens, 2726/// will be updated to reflect a well-formed type for the destructor and 2727/// returned. 2728QualType Sema::CheckDestructorDeclarator(Declarator &D, 2729 FunctionDecl::StorageClass& SC) { 2730 // C++ [class.dtor]p1: 2731 // [...] A typedef-name that names a class is a class-name 2732 // (7.1.3); however, a typedef-name that names a class shall not 2733 // be used as the identifier in the declarator for a destructor 2734 // declaration. 2735 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2736 if (isa<TypedefType>(DeclaratorType)) { 2737 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2738 << DeclaratorType; 2739 D.setInvalidType(); 2740 } 2741 2742 // C++ [class.dtor]p2: 2743 // A destructor is used to destroy objects of its class type. A 2744 // destructor takes no parameters, and no return type can be 2745 // specified for it (not even void). The address of a destructor 2746 // shall not be taken. A destructor shall not be static. A 2747 // destructor can be invoked for a const, volatile or const 2748 // volatile object. A destructor shall not be declared const, 2749 // volatile or const volatile (9.3.2). 2750 if (SC == FunctionDecl::Static) { 2751 if (!D.isInvalidType()) 2752 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2753 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2754 << SourceRange(D.getIdentifierLoc()); 2755 SC = FunctionDecl::None; 2756 D.setInvalidType(); 2757 } 2758 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2759 // Destructors don't have return types, but the parser will 2760 // happily parse something like: 2761 // 2762 // class X { 2763 // float ~X(); 2764 // }; 2765 // 2766 // The return type will be eliminated later. 2767 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2768 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2769 << SourceRange(D.getIdentifierLoc()); 2770 } 2771 2772 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2773 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2774 if (FTI.TypeQuals & Qualifiers::Const) 2775 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2776 << "const" << SourceRange(D.getIdentifierLoc()); 2777 if (FTI.TypeQuals & Qualifiers::Volatile) 2778 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2779 << "volatile" << SourceRange(D.getIdentifierLoc()); 2780 if (FTI.TypeQuals & Qualifiers::Restrict) 2781 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2782 << "restrict" << SourceRange(D.getIdentifierLoc()); 2783 D.setInvalidType(); 2784 } 2785 2786 // Make sure we don't have any parameters. 2787 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2788 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2789 2790 // Delete the parameters. 2791 FTI.freeArgs(); 2792 D.setInvalidType(); 2793 } 2794 2795 // Make sure the destructor isn't variadic. 2796 if (FTI.isVariadic) { 2797 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2798 D.setInvalidType(); 2799 } 2800 2801 // Rebuild the function type "R" without any type qualifiers or 2802 // parameters (in case any of the errors above fired) and with 2803 // "void" as the return type, since destructors don't have return 2804 // types. We *always* have to do this, because GetTypeForDeclarator 2805 // will put in a result type of "int" when none was specified. 2806 // FIXME: Exceptions! 2807 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2808 false, false, 0, 0, FunctionType::ExtInfo()); 2809} 2810 2811/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2812/// well-formednes of the conversion function declarator @p D with 2813/// type @p R. If there are any errors in the declarator, this routine 2814/// will emit diagnostics and return true. Otherwise, it will return 2815/// false. Either way, the type @p R will be updated to reflect a 2816/// well-formed type for the conversion operator. 2817void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2818 FunctionDecl::StorageClass& SC) { 2819 // C++ [class.conv.fct]p1: 2820 // Neither parameter types nor return type can be specified. The 2821 // type of a conversion function (8.3.5) is "function taking no 2822 // parameter returning conversion-type-id." 2823 if (SC == FunctionDecl::Static) { 2824 if (!D.isInvalidType()) 2825 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2826 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2827 << SourceRange(D.getIdentifierLoc()); 2828 D.setInvalidType(); 2829 SC = FunctionDecl::None; 2830 } 2831 2832 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2833 2834 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2835 // Conversion functions don't have return types, but the parser will 2836 // happily parse something like: 2837 // 2838 // class X { 2839 // float operator bool(); 2840 // }; 2841 // 2842 // The return type will be changed later anyway. 2843 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2844 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2845 << SourceRange(D.getIdentifierLoc()); 2846 D.setInvalidType(); 2847 } 2848 2849 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2850 2851 // Make sure we don't have any parameters. 2852 if (Proto->getNumArgs() > 0) { 2853 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2854 2855 // Delete the parameters. 2856 D.getTypeObject(0).Fun.freeArgs(); 2857 D.setInvalidType(); 2858 } else if (Proto->isVariadic()) { 2859 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2860 D.setInvalidType(); 2861 } 2862 2863 // Diagnose "&operator bool()" and other such nonsense. This 2864 // is actually a gcc extension which we don't support. 2865 if (Proto->getResultType() != ConvType) { 2866 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 2867 << Proto->getResultType(); 2868 D.setInvalidType(); 2869 ConvType = Proto->getResultType(); 2870 } 2871 2872 // C++ [class.conv.fct]p4: 2873 // The conversion-type-id shall not represent a function type nor 2874 // an array type. 2875 if (ConvType->isArrayType()) { 2876 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2877 ConvType = Context.getPointerType(ConvType); 2878 D.setInvalidType(); 2879 } else if (ConvType->isFunctionType()) { 2880 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2881 ConvType = Context.getPointerType(ConvType); 2882 D.setInvalidType(); 2883 } 2884 2885 // Rebuild the function type "R" without any parameters (in case any 2886 // of the errors above fired) and with the conversion type as the 2887 // return type. 2888 if (D.isInvalidType()) { 2889 R = Context.getFunctionType(ConvType, 0, 0, false, 2890 Proto->getTypeQuals(), 2891 Proto->hasExceptionSpec(), 2892 Proto->hasAnyExceptionSpec(), 2893 Proto->getNumExceptions(), 2894 Proto->exception_begin(), 2895 Proto->getExtInfo()); 2896 } 2897 2898 // C++0x explicit conversion operators. 2899 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2900 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2901 diag::warn_explicit_conversion_functions) 2902 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2903} 2904 2905/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2906/// the declaration of the given C++ conversion function. This routine 2907/// is responsible for recording the conversion function in the C++ 2908/// class, if possible. 2909Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2910 assert(Conversion && "Expected to receive a conversion function declaration"); 2911 2912 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2913 2914 // Make sure we aren't redeclaring the conversion function. 2915 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2916 2917 // C++ [class.conv.fct]p1: 2918 // [...] A conversion function is never used to convert a 2919 // (possibly cv-qualified) object to the (possibly cv-qualified) 2920 // same object type (or a reference to it), to a (possibly 2921 // cv-qualified) base class of that type (or a reference to it), 2922 // or to (possibly cv-qualified) void. 2923 // FIXME: Suppress this warning if the conversion function ends up being a 2924 // virtual function that overrides a virtual function in a base class. 2925 QualType ClassType 2926 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2927 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2928 ConvType = ConvTypeRef->getPointeeType(); 2929 if (ConvType->isRecordType()) { 2930 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2931 if (ConvType == ClassType) 2932 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2933 << ClassType; 2934 else if (IsDerivedFrom(ClassType, ConvType)) 2935 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2936 << ClassType << ConvType; 2937 } else if (ConvType->isVoidType()) { 2938 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2939 << ClassType << ConvType; 2940 } 2941 2942 if (Conversion->getPrimaryTemplate()) { 2943 // ignore specializations 2944 } else if (Conversion->getPreviousDeclaration()) { 2945 if (FunctionTemplateDecl *ConversionTemplate 2946 = Conversion->getDescribedFunctionTemplate()) { 2947 if (ClassDecl->replaceConversion( 2948 ConversionTemplate->getPreviousDeclaration(), 2949 ConversionTemplate)) 2950 return DeclPtrTy::make(ConversionTemplate); 2951 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2952 Conversion)) 2953 return DeclPtrTy::make(Conversion); 2954 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2955 } else if (FunctionTemplateDecl *ConversionTemplate 2956 = Conversion->getDescribedFunctionTemplate()) 2957 ClassDecl->addConversionFunction(ConversionTemplate); 2958 else 2959 ClassDecl->addConversionFunction(Conversion); 2960 2961 return DeclPtrTy::make(Conversion); 2962} 2963 2964//===----------------------------------------------------------------------===// 2965// Namespace Handling 2966//===----------------------------------------------------------------------===// 2967 2968/// ActOnStartNamespaceDef - This is called at the start of a namespace 2969/// definition. 2970Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2971 SourceLocation IdentLoc, 2972 IdentifierInfo *II, 2973 SourceLocation LBrace, 2974 AttributeList *AttrList) { 2975 NamespaceDecl *Namespc = 2976 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2977 Namespc->setLBracLoc(LBrace); 2978 2979 Scope *DeclRegionScope = NamespcScope->getParent(); 2980 2981 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2982 2983 if (II) { 2984 // C++ [namespace.def]p2: 2985 // The identifier in an original-namespace-definition shall not have been 2986 // previously defined in the declarative region in which the 2987 // original-namespace-definition appears. The identifier in an 2988 // original-namespace-definition is the name of the namespace. Subsequently 2989 // in that declarative region, it is treated as an original-namespace-name. 2990 2991 NamedDecl *PrevDecl 2992 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2993 ForRedeclaration); 2994 2995 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2996 // This is an extended namespace definition. 2997 // Attach this namespace decl to the chain of extended namespace 2998 // definitions. 2999 OrigNS->setNextNamespace(Namespc); 3000 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3001 3002 // Remove the previous declaration from the scope. 3003 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3004 IdResolver.RemoveDecl(OrigNS); 3005 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3006 } 3007 } else if (PrevDecl) { 3008 // This is an invalid name redefinition. 3009 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3010 << Namespc->getDeclName(); 3011 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3012 Namespc->setInvalidDecl(); 3013 // Continue on to push Namespc as current DeclContext and return it. 3014 } else if (II->isStr("std") && 3015 CurContext->getLookupContext()->isTranslationUnit()) { 3016 // This is the first "real" definition of the namespace "std", so update 3017 // our cache of the "std" namespace to point at this definition. 3018 if (StdNamespace) { 3019 // We had already defined a dummy namespace "std". Link this new 3020 // namespace definition to the dummy namespace "std". 3021 StdNamespace->setNextNamespace(Namespc); 3022 StdNamespace->setLocation(IdentLoc); 3023 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3024 } 3025 3026 // Make our StdNamespace cache point at the first real definition of the 3027 // "std" namespace. 3028 StdNamespace = Namespc; 3029 } 3030 3031 PushOnScopeChains(Namespc, DeclRegionScope); 3032 } else { 3033 // Anonymous namespaces. 3034 assert(Namespc->isAnonymousNamespace()); 3035 3036 // Link the anonymous namespace into its parent. 3037 NamespaceDecl *PrevDecl; 3038 DeclContext *Parent = CurContext->getLookupContext(); 3039 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3040 PrevDecl = TU->getAnonymousNamespace(); 3041 TU->setAnonymousNamespace(Namespc); 3042 } else { 3043 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3044 PrevDecl = ND->getAnonymousNamespace(); 3045 ND->setAnonymousNamespace(Namespc); 3046 } 3047 3048 // Link the anonymous namespace with its previous declaration. 3049 if (PrevDecl) { 3050 assert(PrevDecl->isAnonymousNamespace()); 3051 assert(!PrevDecl->getNextNamespace()); 3052 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3053 PrevDecl->setNextNamespace(Namespc); 3054 } 3055 3056 CurContext->addDecl(Namespc); 3057 3058 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3059 // behaves as if it were replaced by 3060 // namespace unique { /* empty body */ } 3061 // using namespace unique; 3062 // namespace unique { namespace-body } 3063 // where all occurrences of 'unique' in a translation unit are 3064 // replaced by the same identifier and this identifier differs 3065 // from all other identifiers in the entire program. 3066 3067 // We just create the namespace with an empty name and then add an 3068 // implicit using declaration, just like the standard suggests. 3069 // 3070 // CodeGen enforces the "universally unique" aspect by giving all 3071 // declarations semantically contained within an anonymous 3072 // namespace internal linkage. 3073 3074 if (!PrevDecl) { 3075 UsingDirectiveDecl* UD 3076 = UsingDirectiveDecl::Create(Context, CurContext, 3077 /* 'using' */ LBrace, 3078 /* 'namespace' */ SourceLocation(), 3079 /* qualifier */ SourceRange(), 3080 /* NNS */ NULL, 3081 /* identifier */ SourceLocation(), 3082 Namespc, 3083 /* Ancestor */ CurContext); 3084 UD->setImplicit(); 3085 CurContext->addDecl(UD); 3086 } 3087 } 3088 3089 // Although we could have an invalid decl (i.e. the namespace name is a 3090 // redefinition), push it as current DeclContext and try to continue parsing. 3091 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3092 // for the namespace has the declarations that showed up in that particular 3093 // namespace definition. 3094 PushDeclContext(NamespcScope, Namespc); 3095 return DeclPtrTy::make(Namespc); 3096} 3097 3098/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3099/// is a namespace alias, returns the namespace it points to. 3100static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3101 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3102 return AD->getNamespace(); 3103 return dyn_cast_or_null<NamespaceDecl>(D); 3104} 3105 3106/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3107/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3108void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3109 Decl *Dcl = D.getAs<Decl>(); 3110 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3111 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3112 Namespc->setRBracLoc(RBrace); 3113 PopDeclContext(); 3114} 3115 3116Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3117 SourceLocation UsingLoc, 3118 SourceLocation NamespcLoc, 3119 CXXScopeSpec &SS, 3120 SourceLocation IdentLoc, 3121 IdentifierInfo *NamespcName, 3122 AttributeList *AttrList) { 3123 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3124 assert(NamespcName && "Invalid NamespcName."); 3125 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3126 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3127 3128 UsingDirectiveDecl *UDir = 0; 3129 3130 // Lookup namespace name. 3131 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3132 LookupParsedName(R, S, &SS); 3133 if (R.isAmbiguous()) 3134 return DeclPtrTy(); 3135 3136 if (!R.empty()) { 3137 NamedDecl *Named = R.getFoundDecl(); 3138 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3139 && "expected namespace decl"); 3140 // C++ [namespace.udir]p1: 3141 // A using-directive specifies that the names in the nominated 3142 // namespace can be used in the scope in which the 3143 // using-directive appears after the using-directive. During 3144 // unqualified name lookup (3.4.1), the names appear as if they 3145 // were declared in the nearest enclosing namespace which 3146 // contains both the using-directive and the nominated 3147 // namespace. [Note: in this context, "contains" means "contains 3148 // directly or indirectly". ] 3149 3150 // Find enclosing context containing both using-directive and 3151 // nominated namespace. 3152 NamespaceDecl *NS = getNamespaceDecl(Named); 3153 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3154 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3155 CommonAncestor = CommonAncestor->getParent(); 3156 3157 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3158 SS.getRange(), 3159 (NestedNameSpecifier *)SS.getScopeRep(), 3160 IdentLoc, Named, CommonAncestor); 3161 PushUsingDirective(S, UDir); 3162 } else { 3163 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3164 } 3165 3166 // FIXME: We ignore attributes for now. 3167 delete AttrList; 3168 return DeclPtrTy::make(UDir); 3169} 3170 3171void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3172 // If scope has associated entity, then using directive is at namespace 3173 // or translation unit scope. We add UsingDirectiveDecls, into 3174 // it's lookup structure. 3175 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3176 Ctx->addDecl(UDir); 3177 else 3178 // Otherwise it is block-sope. using-directives will affect lookup 3179 // only to the end of scope. 3180 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3181} 3182 3183 3184Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3185 AccessSpecifier AS, 3186 bool HasUsingKeyword, 3187 SourceLocation UsingLoc, 3188 CXXScopeSpec &SS, 3189 UnqualifiedId &Name, 3190 AttributeList *AttrList, 3191 bool IsTypeName, 3192 SourceLocation TypenameLoc) { 3193 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3194 3195 switch (Name.getKind()) { 3196 case UnqualifiedId::IK_Identifier: 3197 case UnqualifiedId::IK_OperatorFunctionId: 3198 case UnqualifiedId::IK_LiteralOperatorId: 3199 case UnqualifiedId::IK_ConversionFunctionId: 3200 break; 3201 3202 case UnqualifiedId::IK_ConstructorName: 3203 case UnqualifiedId::IK_ConstructorTemplateId: 3204 // C++0x inherited constructors. 3205 if (getLangOptions().CPlusPlus0x) break; 3206 3207 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3208 << SS.getRange(); 3209 return DeclPtrTy(); 3210 3211 case UnqualifiedId::IK_DestructorName: 3212 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3213 << SS.getRange(); 3214 return DeclPtrTy(); 3215 3216 case UnqualifiedId::IK_TemplateId: 3217 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3218 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3219 return DeclPtrTy(); 3220 } 3221 3222 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3223 if (!TargetName) 3224 return DeclPtrTy(); 3225 3226 // Warn about using declarations. 3227 // TODO: store that the declaration was written without 'using' and 3228 // talk about access decls instead of using decls in the 3229 // diagnostics. 3230 if (!HasUsingKeyword) { 3231 UsingLoc = Name.getSourceRange().getBegin(); 3232 3233 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3234 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3235 } 3236 3237 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3238 Name.getSourceRange().getBegin(), 3239 TargetName, AttrList, 3240 /* IsInstantiation */ false, 3241 IsTypeName, TypenameLoc); 3242 if (UD) 3243 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3244 3245 return DeclPtrTy::make(UD); 3246} 3247 3248/// Determines whether to create a using shadow decl for a particular 3249/// decl, given the set of decls existing prior to this using lookup. 3250bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3251 const LookupResult &Previous) { 3252 // Diagnose finding a decl which is not from a base class of the 3253 // current class. We do this now because there are cases where this 3254 // function will silently decide not to build a shadow decl, which 3255 // will pre-empt further diagnostics. 3256 // 3257 // We don't need to do this in C++0x because we do the check once on 3258 // the qualifier. 3259 // 3260 // FIXME: diagnose the following if we care enough: 3261 // struct A { int foo; }; 3262 // struct B : A { using A::foo; }; 3263 // template <class T> struct C : A {}; 3264 // template <class T> struct D : C<T> { using B::foo; } // <--- 3265 // This is invalid (during instantiation) in C++03 because B::foo 3266 // resolves to the using decl in B, which is not a base class of D<T>. 3267 // We can't diagnose it immediately because C<T> is an unknown 3268 // specialization. The UsingShadowDecl in D<T> then points directly 3269 // to A::foo, which will look well-formed when we instantiate. 3270 // The right solution is to not collapse the shadow-decl chain. 3271 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3272 DeclContext *OrigDC = Orig->getDeclContext(); 3273 3274 // Handle enums and anonymous structs. 3275 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3276 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3277 while (OrigRec->isAnonymousStructOrUnion()) 3278 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3279 3280 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3281 if (OrigDC == CurContext) { 3282 Diag(Using->getLocation(), 3283 diag::err_using_decl_nested_name_specifier_is_current_class) 3284 << Using->getNestedNameRange(); 3285 Diag(Orig->getLocation(), diag::note_using_decl_target); 3286 return true; 3287 } 3288 3289 Diag(Using->getNestedNameRange().getBegin(), 3290 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3291 << Using->getTargetNestedNameDecl() 3292 << cast<CXXRecordDecl>(CurContext) 3293 << Using->getNestedNameRange(); 3294 Diag(Orig->getLocation(), diag::note_using_decl_target); 3295 return true; 3296 } 3297 } 3298 3299 if (Previous.empty()) return false; 3300 3301 NamedDecl *Target = Orig; 3302 if (isa<UsingShadowDecl>(Target)) 3303 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3304 3305 // If the target happens to be one of the previous declarations, we 3306 // don't have a conflict. 3307 // 3308 // FIXME: but we might be increasing its access, in which case we 3309 // should redeclare it. 3310 NamedDecl *NonTag = 0, *Tag = 0; 3311 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3312 I != E; ++I) { 3313 NamedDecl *D = (*I)->getUnderlyingDecl(); 3314 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3315 return false; 3316 3317 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3318 } 3319 3320 if (Target->isFunctionOrFunctionTemplate()) { 3321 FunctionDecl *FD; 3322 if (isa<FunctionTemplateDecl>(Target)) 3323 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3324 else 3325 FD = cast<FunctionDecl>(Target); 3326 3327 NamedDecl *OldDecl = 0; 3328 switch (CheckOverload(FD, Previous, OldDecl)) { 3329 case Ovl_Overload: 3330 return false; 3331 3332 case Ovl_NonFunction: 3333 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3334 break; 3335 3336 // We found a decl with the exact signature. 3337 case Ovl_Match: 3338 if (isa<UsingShadowDecl>(OldDecl)) { 3339 // Silently ignore the possible conflict. 3340 return false; 3341 } 3342 3343 // If we're in a record, we want to hide the target, so we 3344 // return true (without a diagnostic) to tell the caller not to 3345 // build a shadow decl. 3346 if (CurContext->isRecord()) 3347 return true; 3348 3349 // If we're not in a record, this is an error. 3350 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3351 break; 3352 } 3353 3354 Diag(Target->getLocation(), diag::note_using_decl_target); 3355 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3356 return true; 3357 } 3358 3359 // Target is not a function. 3360 3361 if (isa<TagDecl>(Target)) { 3362 // No conflict between a tag and a non-tag. 3363 if (!Tag) return false; 3364 3365 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3366 Diag(Target->getLocation(), diag::note_using_decl_target); 3367 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3368 return true; 3369 } 3370 3371 // No conflict between a tag and a non-tag. 3372 if (!NonTag) return false; 3373 3374 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3375 Diag(Target->getLocation(), diag::note_using_decl_target); 3376 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3377 return true; 3378} 3379 3380/// Builds a shadow declaration corresponding to a 'using' declaration. 3381UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3382 UsingDecl *UD, 3383 NamedDecl *Orig) { 3384 3385 // If we resolved to another shadow declaration, just coalesce them. 3386 NamedDecl *Target = Orig; 3387 if (isa<UsingShadowDecl>(Target)) { 3388 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3389 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3390 } 3391 3392 UsingShadowDecl *Shadow 3393 = UsingShadowDecl::Create(Context, CurContext, 3394 UD->getLocation(), UD, Target); 3395 UD->addShadowDecl(Shadow); 3396 3397 if (S) 3398 PushOnScopeChains(Shadow, S); 3399 else 3400 CurContext->addDecl(Shadow); 3401 Shadow->setAccess(UD->getAccess()); 3402 3403 // Register it as a conversion if appropriate. 3404 if (Shadow->getDeclName().getNameKind() 3405 == DeclarationName::CXXConversionFunctionName) 3406 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3407 3408 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3409 Shadow->setInvalidDecl(); 3410 3411 return Shadow; 3412} 3413 3414/// Hides a using shadow declaration. This is required by the current 3415/// using-decl implementation when a resolvable using declaration in a 3416/// class is followed by a declaration which would hide or override 3417/// one or more of the using decl's targets; for example: 3418/// 3419/// struct Base { void foo(int); }; 3420/// struct Derived : Base { 3421/// using Base::foo; 3422/// void foo(int); 3423/// }; 3424/// 3425/// The governing language is C++03 [namespace.udecl]p12: 3426/// 3427/// When a using-declaration brings names from a base class into a 3428/// derived class scope, member functions in the derived class 3429/// override and/or hide member functions with the same name and 3430/// parameter types in a base class (rather than conflicting). 3431/// 3432/// There are two ways to implement this: 3433/// (1) optimistically create shadow decls when they're not hidden 3434/// by existing declarations, or 3435/// (2) don't create any shadow decls (or at least don't make them 3436/// visible) until we've fully parsed/instantiated the class. 3437/// The problem with (1) is that we might have to retroactively remove 3438/// a shadow decl, which requires several O(n) operations because the 3439/// decl structures are (very reasonably) not designed for removal. 3440/// (2) avoids this but is very fiddly and phase-dependent. 3441void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3442 if (Shadow->getDeclName().getNameKind() == 3443 DeclarationName::CXXConversionFunctionName) 3444 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3445 3446 // Remove it from the DeclContext... 3447 Shadow->getDeclContext()->removeDecl(Shadow); 3448 3449 // ...and the scope, if applicable... 3450 if (S) { 3451 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3452 IdResolver.RemoveDecl(Shadow); 3453 } 3454 3455 // ...and the using decl. 3456 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3457 3458 // TODO: complain somehow if Shadow was used. It shouldn't 3459 // be possible for this to happen, because...? 3460} 3461 3462/// Builds a using declaration. 3463/// 3464/// \param IsInstantiation - Whether this call arises from an 3465/// instantiation of an unresolved using declaration. We treat 3466/// the lookup differently for these declarations. 3467NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3468 SourceLocation UsingLoc, 3469 CXXScopeSpec &SS, 3470 SourceLocation IdentLoc, 3471 DeclarationName Name, 3472 AttributeList *AttrList, 3473 bool IsInstantiation, 3474 bool IsTypeName, 3475 SourceLocation TypenameLoc) { 3476 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3477 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3478 3479 // FIXME: We ignore attributes for now. 3480 delete AttrList; 3481 3482 if (SS.isEmpty()) { 3483 Diag(IdentLoc, diag::err_using_requires_qualname); 3484 return 0; 3485 } 3486 3487 // Do the redeclaration lookup in the current scope. 3488 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3489 ForRedeclaration); 3490 Previous.setHideTags(false); 3491 if (S) { 3492 LookupName(Previous, S); 3493 3494 // It is really dumb that we have to do this. 3495 LookupResult::Filter F = Previous.makeFilter(); 3496 while (F.hasNext()) { 3497 NamedDecl *D = F.next(); 3498 if (!isDeclInScope(D, CurContext, S)) 3499 F.erase(); 3500 } 3501 F.done(); 3502 } else { 3503 assert(IsInstantiation && "no scope in non-instantiation"); 3504 assert(CurContext->isRecord() && "scope not record in instantiation"); 3505 LookupQualifiedName(Previous, CurContext); 3506 } 3507 3508 NestedNameSpecifier *NNS = 3509 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3510 3511 // Check for invalid redeclarations. 3512 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3513 return 0; 3514 3515 // Check for bad qualifiers. 3516 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3517 return 0; 3518 3519 DeclContext *LookupContext = computeDeclContext(SS); 3520 NamedDecl *D; 3521 if (!LookupContext) { 3522 if (IsTypeName) { 3523 // FIXME: not all declaration name kinds are legal here 3524 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3525 UsingLoc, TypenameLoc, 3526 SS.getRange(), NNS, 3527 IdentLoc, Name); 3528 } else { 3529 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3530 UsingLoc, SS.getRange(), NNS, 3531 IdentLoc, Name); 3532 } 3533 } else { 3534 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3535 SS.getRange(), UsingLoc, NNS, Name, 3536 IsTypeName); 3537 } 3538 D->setAccess(AS); 3539 CurContext->addDecl(D); 3540 3541 if (!LookupContext) return D; 3542 UsingDecl *UD = cast<UsingDecl>(D); 3543 3544 if (RequireCompleteDeclContext(SS)) { 3545 UD->setInvalidDecl(); 3546 return UD; 3547 } 3548 3549 // Look up the target name. 3550 3551 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3552 3553 // Unlike most lookups, we don't always want to hide tag 3554 // declarations: tag names are visible through the using declaration 3555 // even if hidden by ordinary names, *except* in a dependent context 3556 // where it's important for the sanity of two-phase lookup. 3557 if (!IsInstantiation) 3558 R.setHideTags(false); 3559 3560 LookupQualifiedName(R, LookupContext); 3561 3562 if (R.empty()) { 3563 Diag(IdentLoc, diag::err_no_member) 3564 << Name << LookupContext << SS.getRange(); 3565 UD->setInvalidDecl(); 3566 return UD; 3567 } 3568 3569 if (R.isAmbiguous()) { 3570 UD->setInvalidDecl(); 3571 return UD; 3572 } 3573 3574 if (IsTypeName) { 3575 // If we asked for a typename and got a non-type decl, error out. 3576 if (!R.getAsSingle<TypeDecl>()) { 3577 Diag(IdentLoc, diag::err_using_typename_non_type); 3578 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3579 Diag((*I)->getUnderlyingDecl()->getLocation(), 3580 diag::note_using_decl_target); 3581 UD->setInvalidDecl(); 3582 return UD; 3583 } 3584 } else { 3585 // If we asked for a non-typename and we got a type, error out, 3586 // but only if this is an instantiation of an unresolved using 3587 // decl. Otherwise just silently find the type name. 3588 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3589 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3590 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3591 UD->setInvalidDecl(); 3592 return UD; 3593 } 3594 } 3595 3596 // C++0x N2914 [namespace.udecl]p6: 3597 // A using-declaration shall not name a namespace. 3598 if (R.getAsSingle<NamespaceDecl>()) { 3599 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3600 << SS.getRange(); 3601 UD->setInvalidDecl(); 3602 return UD; 3603 } 3604 3605 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3606 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3607 BuildUsingShadowDecl(S, UD, *I); 3608 } 3609 3610 return UD; 3611} 3612 3613/// Checks that the given using declaration is not an invalid 3614/// redeclaration. Note that this is checking only for the using decl 3615/// itself, not for any ill-formedness among the UsingShadowDecls. 3616bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3617 bool isTypeName, 3618 const CXXScopeSpec &SS, 3619 SourceLocation NameLoc, 3620 const LookupResult &Prev) { 3621 // C++03 [namespace.udecl]p8: 3622 // C++0x [namespace.udecl]p10: 3623 // A using-declaration is a declaration and can therefore be used 3624 // repeatedly where (and only where) multiple declarations are 3625 // allowed. 3626 // That's only in file contexts. 3627 if (CurContext->getLookupContext()->isFileContext()) 3628 return false; 3629 3630 NestedNameSpecifier *Qual 3631 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3632 3633 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3634 NamedDecl *D = *I; 3635 3636 bool DTypename; 3637 NestedNameSpecifier *DQual; 3638 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3639 DTypename = UD->isTypeName(); 3640 DQual = UD->getTargetNestedNameDecl(); 3641 } else if (UnresolvedUsingValueDecl *UD 3642 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3643 DTypename = false; 3644 DQual = UD->getTargetNestedNameSpecifier(); 3645 } else if (UnresolvedUsingTypenameDecl *UD 3646 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3647 DTypename = true; 3648 DQual = UD->getTargetNestedNameSpecifier(); 3649 } else continue; 3650 3651 // using decls differ if one says 'typename' and the other doesn't. 3652 // FIXME: non-dependent using decls? 3653 if (isTypeName != DTypename) continue; 3654 3655 // using decls differ if they name different scopes (but note that 3656 // template instantiation can cause this check to trigger when it 3657 // didn't before instantiation). 3658 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3659 Context.getCanonicalNestedNameSpecifier(DQual)) 3660 continue; 3661 3662 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3663 Diag(D->getLocation(), diag::note_using_decl) << 1; 3664 return true; 3665 } 3666 3667 return false; 3668} 3669 3670 3671/// Checks that the given nested-name qualifier used in a using decl 3672/// in the current context is appropriately related to the current 3673/// scope. If an error is found, diagnoses it and returns true. 3674bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3675 const CXXScopeSpec &SS, 3676 SourceLocation NameLoc) { 3677 DeclContext *NamedContext = computeDeclContext(SS); 3678 3679 if (!CurContext->isRecord()) { 3680 // C++03 [namespace.udecl]p3: 3681 // C++0x [namespace.udecl]p8: 3682 // A using-declaration for a class member shall be a member-declaration. 3683 3684 // If we weren't able to compute a valid scope, it must be a 3685 // dependent class scope. 3686 if (!NamedContext || NamedContext->isRecord()) { 3687 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3688 << SS.getRange(); 3689 return true; 3690 } 3691 3692 // Otherwise, everything is known to be fine. 3693 return false; 3694 } 3695 3696 // The current scope is a record. 3697 3698 // If the named context is dependent, we can't decide much. 3699 if (!NamedContext) { 3700 // FIXME: in C++0x, we can diagnose if we can prove that the 3701 // nested-name-specifier does not refer to a base class, which is 3702 // still possible in some cases. 3703 3704 // Otherwise we have to conservatively report that things might be 3705 // okay. 3706 return false; 3707 } 3708 3709 if (!NamedContext->isRecord()) { 3710 // Ideally this would point at the last name in the specifier, 3711 // but we don't have that level of source info. 3712 Diag(SS.getRange().getBegin(), 3713 diag::err_using_decl_nested_name_specifier_is_not_class) 3714 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3715 return true; 3716 } 3717 3718 if (getLangOptions().CPlusPlus0x) { 3719 // C++0x [namespace.udecl]p3: 3720 // In a using-declaration used as a member-declaration, the 3721 // nested-name-specifier shall name a base class of the class 3722 // being defined. 3723 3724 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3725 cast<CXXRecordDecl>(NamedContext))) { 3726 if (CurContext == NamedContext) { 3727 Diag(NameLoc, 3728 diag::err_using_decl_nested_name_specifier_is_current_class) 3729 << SS.getRange(); 3730 return true; 3731 } 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 return true; 3739 } 3740 3741 return false; 3742 } 3743 3744 // C++03 [namespace.udecl]p4: 3745 // A using-declaration used as a member-declaration shall refer 3746 // to a member of a base class of the class being defined [etc.]. 3747 3748 // Salient point: SS doesn't have to name a base class as long as 3749 // lookup only finds members from base classes. Therefore we can 3750 // diagnose here only if we can prove that that can't happen, 3751 // i.e. if the class hierarchies provably don't intersect. 3752 3753 // TODO: it would be nice if "definitely valid" results were cached 3754 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3755 // need to be repeated. 3756 3757 struct UserData { 3758 llvm::DenseSet<const CXXRecordDecl*> Bases; 3759 3760 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3761 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3762 Data->Bases.insert(Base); 3763 return true; 3764 } 3765 3766 bool hasDependentBases(const CXXRecordDecl *Class) { 3767 return !Class->forallBases(collect, this); 3768 } 3769 3770 /// Returns true if the base is dependent or is one of the 3771 /// accumulated base classes. 3772 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3773 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3774 return !Data->Bases.count(Base); 3775 } 3776 3777 bool mightShareBases(const CXXRecordDecl *Class) { 3778 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3779 } 3780 }; 3781 3782 UserData Data; 3783 3784 // Returns false if we find a dependent base. 3785 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3786 return false; 3787 3788 // Returns false if the class has a dependent base or if it or one 3789 // of its bases is present in the base set of the current context. 3790 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3791 return false; 3792 3793 Diag(SS.getRange().getBegin(), 3794 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3795 << (NestedNameSpecifier*) SS.getScopeRep() 3796 << cast<CXXRecordDecl>(CurContext) 3797 << SS.getRange(); 3798 3799 return true; 3800} 3801 3802Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3803 SourceLocation NamespaceLoc, 3804 SourceLocation AliasLoc, 3805 IdentifierInfo *Alias, 3806 CXXScopeSpec &SS, 3807 SourceLocation IdentLoc, 3808 IdentifierInfo *Ident) { 3809 3810 // Lookup the namespace name. 3811 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3812 LookupParsedName(R, S, &SS); 3813 3814 // Check if we have a previous declaration with the same name. 3815 if (NamedDecl *PrevDecl 3816 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3817 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3818 // We already have an alias with the same name that points to the same 3819 // namespace, so don't create a new one. 3820 // FIXME: At some point, we'll want to create the (redundant) 3821 // declaration to maintain better source information. 3822 if (!R.isAmbiguous() && !R.empty() && 3823 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3824 return DeclPtrTy(); 3825 } 3826 3827 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3828 diag::err_redefinition_different_kind; 3829 Diag(AliasLoc, DiagID) << Alias; 3830 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3831 return DeclPtrTy(); 3832 } 3833 3834 if (R.isAmbiguous()) 3835 return DeclPtrTy(); 3836 3837 if (R.empty()) { 3838 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3839 return DeclPtrTy(); 3840 } 3841 3842 NamespaceAliasDecl *AliasDecl = 3843 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3844 Alias, SS.getRange(), 3845 (NestedNameSpecifier *)SS.getScopeRep(), 3846 IdentLoc, R.getFoundDecl()); 3847 3848 PushOnScopeChains(AliasDecl, S); 3849 return DeclPtrTy::make(AliasDecl); 3850} 3851 3852void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3853 CXXConstructorDecl *Constructor) { 3854 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3855 !Constructor->isUsed()) && 3856 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3857 3858 CXXRecordDecl *ClassDecl 3859 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3860 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3861 3862 DeclContext *PreviousContext = CurContext; 3863 CurContext = Constructor; 3864 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3865 Diag(CurrentLocation, diag::note_member_synthesized_at) 3866 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3867 Constructor->setInvalidDecl(); 3868 } else { 3869 Constructor->setUsed(); 3870 } 3871 CurContext = PreviousContext; 3872} 3873 3874void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3875 CXXDestructorDecl *Destructor) { 3876 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3877 "DefineImplicitDestructor - call it for implicit default dtor"); 3878 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3879 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3880 3881 DeclContext *PreviousContext = CurContext; 3882 CurContext = Destructor; 3883 3884 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3885 Destructor->getParent()); 3886 3887 // FIXME: If CheckDestructor fails, we should emit a note about where the 3888 // implicit destructor was needed. 3889 if (CheckDestructor(Destructor)) { 3890 Diag(CurrentLocation, diag::note_member_synthesized_at) 3891 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3892 3893 Destructor->setInvalidDecl(); 3894 CurContext = PreviousContext; 3895 3896 return; 3897 } 3898 CurContext = PreviousContext; 3899 3900 Destructor->setUsed(); 3901} 3902 3903void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3904 CXXMethodDecl *MethodDecl) { 3905 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3906 MethodDecl->getOverloadedOperator() == OO_Equal && 3907 !MethodDecl->isUsed()) && 3908 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3909 3910 CXXRecordDecl *ClassDecl 3911 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3912 3913 DeclContext *PreviousContext = CurContext; 3914 CurContext = MethodDecl; 3915 3916 // C++[class.copy] p12 3917 // Before the implicitly-declared copy assignment operator for a class is 3918 // implicitly defined, all implicitly-declared copy assignment operators 3919 // for its direct base classes and its nonstatic data members shall have 3920 // been implicitly defined. 3921 bool err = false; 3922 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3923 E = ClassDecl->bases_end(); Base != E; ++Base) { 3924 CXXRecordDecl *BaseClassDecl 3925 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3926 if (CXXMethodDecl *BaseAssignOpMethod = 3927 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3928 BaseClassDecl)) { 3929 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3930 BaseAssignOpMethod, 3931 PDiag(diag::err_access_assign_base) 3932 << Base->getType()); 3933 3934 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3935 } 3936 } 3937 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3938 E = ClassDecl->field_end(); Field != E; ++Field) { 3939 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3940 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3941 FieldType = Array->getElementType(); 3942 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3943 CXXRecordDecl *FieldClassDecl 3944 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3945 if (CXXMethodDecl *FieldAssignOpMethod = 3946 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3947 FieldClassDecl)) { 3948 CheckDirectMemberAccess(Field->getLocation(), 3949 FieldAssignOpMethod, 3950 PDiag(diag::err_access_assign_field) 3951 << Field->getDeclName() << Field->getType()); 3952 3953 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3954 } 3955 } else if (FieldType->isReferenceType()) { 3956 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3957 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3958 Diag(Field->getLocation(), diag::note_declared_at); 3959 Diag(CurrentLocation, diag::note_first_required_here); 3960 err = true; 3961 } else if (FieldType.isConstQualified()) { 3962 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3963 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3964 Diag(Field->getLocation(), diag::note_declared_at); 3965 Diag(CurrentLocation, diag::note_first_required_here); 3966 err = true; 3967 } 3968 } 3969 if (!err) 3970 MethodDecl->setUsed(); 3971 3972 CurContext = PreviousContext; 3973} 3974 3975CXXMethodDecl * 3976Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3977 ParmVarDecl *ParmDecl, 3978 CXXRecordDecl *ClassDecl) { 3979 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3980 QualType RHSType(LHSType); 3981 // If class's assignment operator argument is const/volatile qualified, 3982 // look for operator = (const/volatile B&). Otherwise, look for 3983 // operator = (B&). 3984 RHSType = Context.getCVRQualifiedType(RHSType, 3985 ParmDecl->getType().getCVRQualifiers()); 3986 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3987 LHSType, 3988 SourceLocation())); 3989 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3990 RHSType, 3991 CurrentLocation)); 3992 Expr *Args[2] = { &*LHS, &*RHS }; 3993 OverloadCandidateSet CandidateSet(CurrentLocation); 3994 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3995 CandidateSet); 3996 OverloadCandidateSet::iterator Best; 3997 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3998 return cast<CXXMethodDecl>(Best->Function); 3999 assert(false && 4000 "getAssignOperatorMethod - copy assignment operator method not found"); 4001 return 0; 4002} 4003 4004void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4005 CXXConstructorDecl *CopyConstructor, 4006 unsigned TypeQuals) { 4007 assert((CopyConstructor->isImplicit() && 4008 CopyConstructor->isCopyConstructor(TypeQuals) && 4009 !CopyConstructor->isUsed()) && 4010 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4011 4012 CXXRecordDecl *ClassDecl 4013 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 4014 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4015 4016 DeclContext *PreviousContext = CurContext; 4017 CurContext = CopyConstructor; 4018 4019 // C++ [class.copy] p209 4020 // Before the implicitly-declared copy constructor for a class is 4021 // implicitly defined, all the implicitly-declared copy constructors 4022 // for its base class and its non-static data members shall have been 4023 // implicitly defined. 4024 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 4025 Base != ClassDecl->bases_end(); ++Base) { 4026 CXXRecordDecl *BaseClassDecl 4027 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4028 if (CXXConstructorDecl *BaseCopyCtor = 4029 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4030 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4031 BaseCopyCtor, 4032 PDiag(diag::err_access_copy_base) 4033 << Base->getType()); 4034 4035 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4036 } 4037 } 4038 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4039 FieldEnd = ClassDecl->field_end(); 4040 Field != FieldEnd; ++Field) { 4041 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4042 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4043 FieldType = Array->getElementType(); 4044 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4045 CXXRecordDecl *FieldClassDecl 4046 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4047 if (CXXConstructorDecl *FieldCopyCtor = 4048 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4049 CheckDirectMemberAccess(Field->getLocation(), 4050 FieldCopyCtor, 4051 PDiag(diag::err_access_copy_field) 4052 << Field->getDeclName() << Field->getType()); 4053 4054 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4055 } 4056 } 4057 } 4058 CopyConstructor->setUsed(); 4059 4060 CurContext = PreviousContext; 4061} 4062 4063Sema::OwningExprResult 4064Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4065 CXXConstructorDecl *Constructor, 4066 MultiExprArg ExprArgs, 4067 bool RequiresZeroInit, 4068 bool BaseInitialization) { 4069 bool Elidable = false; 4070 4071 // C++0x [class.copy]p34: 4072 // When certain criteria are met, an implementation is allowed to 4073 // omit the copy/move construction of a class object, even if the 4074 // copy/move constructor and/or destructor for the object have 4075 // side effects. [...] 4076 // - when a temporary class object that has not been bound to a 4077 // reference (12.2) would be copied/moved to a class object 4078 // with the same cv-unqualified type, the copy/move operation 4079 // can be omitted by constructing the temporary object 4080 // directly into the target of the omitted copy/move 4081 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4082 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4083 Elidable = SubExpr->isTemporaryObject() && 4084 Context.hasSameUnqualifiedType(SubExpr->getType(), 4085 Context.getTypeDeclType(Constructor->getParent())); 4086 } 4087 4088 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4089 Elidable, move(ExprArgs), RequiresZeroInit, 4090 BaseInitialization); 4091} 4092 4093/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4094/// including handling of its default argument expressions. 4095Sema::OwningExprResult 4096Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4097 CXXConstructorDecl *Constructor, bool Elidable, 4098 MultiExprArg ExprArgs, 4099 bool RequiresZeroInit, 4100 bool BaseInitialization) { 4101 unsigned NumExprs = ExprArgs.size(); 4102 Expr **Exprs = (Expr **)ExprArgs.release(); 4103 4104 MarkDeclarationReferenced(ConstructLoc, Constructor); 4105 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4106 Constructor, Elidable, Exprs, NumExprs, 4107 RequiresZeroInit, BaseInitialization)); 4108} 4109 4110bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4111 CXXConstructorDecl *Constructor, 4112 MultiExprArg Exprs) { 4113 OwningExprResult TempResult = 4114 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4115 move(Exprs)); 4116 if (TempResult.isInvalid()) 4117 return true; 4118 4119 Expr *Temp = TempResult.takeAs<Expr>(); 4120 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4121 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4122 VD->setInit(Temp); 4123 4124 return false; 4125} 4126 4127void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4128 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4129 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4130 !ClassDecl->hasTrivialDestructor()) { 4131 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4132 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4133 CheckDestructorAccess(VD->getLocation(), Destructor, 4134 PDiag(diag::err_access_dtor_var) 4135 << VD->getDeclName() 4136 << VD->getType()); 4137 } 4138} 4139 4140/// AddCXXDirectInitializerToDecl - This action is called immediately after 4141/// ActOnDeclarator, when a C++ direct initializer is present. 4142/// e.g: "int x(1);" 4143void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4144 SourceLocation LParenLoc, 4145 MultiExprArg Exprs, 4146 SourceLocation *CommaLocs, 4147 SourceLocation RParenLoc) { 4148 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4149 Decl *RealDecl = Dcl.getAs<Decl>(); 4150 4151 // If there is no declaration, there was an error parsing it. Just ignore 4152 // the initializer. 4153 if (RealDecl == 0) 4154 return; 4155 4156 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4157 if (!VDecl) { 4158 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4159 RealDecl->setInvalidDecl(); 4160 return; 4161 } 4162 4163 // We will represent direct-initialization similarly to copy-initialization: 4164 // int x(1); -as-> int x = 1; 4165 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4166 // 4167 // Clients that want to distinguish between the two forms, can check for 4168 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4169 // A major benefit is that clients that don't particularly care about which 4170 // exactly form was it (like the CodeGen) can handle both cases without 4171 // special case code. 4172 4173 // C++ 8.5p11: 4174 // The form of initialization (using parentheses or '=') is generally 4175 // insignificant, but does matter when the entity being initialized has a 4176 // class type. 4177 QualType DeclInitType = VDecl->getType(); 4178 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4179 DeclInitType = Context.getBaseElementType(Array); 4180 4181 if (!VDecl->getType()->isDependentType() && 4182 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4183 diag::err_typecheck_decl_incomplete_type)) { 4184 VDecl->setInvalidDecl(); 4185 return; 4186 } 4187 4188 // The variable can not have an abstract class type. 4189 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4190 diag::err_abstract_type_in_decl, 4191 AbstractVariableType)) 4192 VDecl->setInvalidDecl(); 4193 4194 const VarDecl *Def; 4195 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4196 Diag(VDecl->getLocation(), diag::err_redefinition) 4197 << VDecl->getDeclName(); 4198 Diag(Def->getLocation(), diag::note_previous_definition); 4199 VDecl->setInvalidDecl(); 4200 return; 4201 } 4202 4203 // If either the declaration has a dependent type or if any of the 4204 // expressions is type-dependent, we represent the initialization 4205 // via a ParenListExpr for later use during template instantiation. 4206 if (VDecl->getType()->isDependentType() || 4207 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4208 // Let clients know that initialization was done with a direct initializer. 4209 VDecl->setCXXDirectInitializer(true); 4210 4211 // Store the initialization expressions as a ParenListExpr. 4212 unsigned NumExprs = Exprs.size(); 4213 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4214 (Expr **)Exprs.release(), 4215 NumExprs, RParenLoc)); 4216 return; 4217 } 4218 4219 // Capture the variable that is being initialized and the style of 4220 // initialization. 4221 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4222 4223 // FIXME: Poor source location information. 4224 InitializationKind Kind 4225 = InitializationKind::CreateDirect(VDecl->getLocation(), 4226 LParenLoc, RParenLoc); 4227 4228 InitializationSequence InitSeq(*this, Entity, Kind, 4229 (Expr**)Exprs.get(), Exprs.size()); 4230 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4231 if (Result.isInvalid()) { 4232 VDecl->setInvalidDecl(); 4233 return; 4234 } 4235 4236 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4237 VDecl->setInit(Result.takeAs<Expr>()); 4238 VDecl->setCXXDirectInitializer(true); 4239 4240 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4241 FinalizeVarWithDestructor(VDecl, Record); 4242} 4243 4244/// \brief Add the applicable constructor candidates for an initialization 4245/// by constructor. 4246static void AddConstructorInitializationCandidates(Sema &SemaRef, 4247 QualType ClassType, 4248 Expr **Args, 4249 unsigned NumArgs, 4250 InitializationKind Kind, 4251 OverloadCandidateSet &CandidateSet) { 4252 // C++ [dcl.init]p14: 4253 // If the initialization is direct-initialization, or if it is 4254 // copy-initialization where the cv-unqualified version of the 4255 // source type is the same class as, or a derived class of, the 4256 // class of the destination, constructors are considered. The 4257 // applicable constructors are enumerated (13.3.1.3), and the 4258 // best one is chosen through overload resolution (13.3). The 4259 // constructor so selected is called to initialize the object, 4260 // with the initializer expression(s) as its argument(s). If no 4261 // constructor applies, or the overload resolution is ambiguous, 4262 // the initialization is ill-formed. 4263 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4264 assert(ClassRec && "Can only initialize a class type here"); 4265 4266 // FIXME: When we decide not to synthesize the implicitly-declared 4267 // constructors, we'll need to make them appear here. 4268 4269 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4270 DeclarationName ConstructorName 4271 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4272 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4273 DeclContext::lookup_const_iterator Con, ConEnd; 4274 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4275 Con != ConEnd; ++Con) { 4276 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4277 4278 // Find the constructor (which may be a template). 4279 CXXConstructorDecl *Constructor = 0; 4280 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4281 if (ConstructorTmpl) 4282 Constructor 4283 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4284 else 4285 Constructor = cast<CXXConstructorDecl>(*Con); 4286 4287 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4288 (Kind.getKind() == InitializationKind::IK_Value) || 4289 (Kind.getKind() == InitializationKind::IK_Copy && 4290 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4291 ((Kind.getKind() == InitializationKind::IK_Default) && 4292 Constructor->isDefaultConstructor())) { 4293 if (ConstructorTmpl) 4294 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4295 /*ExplicitArgs*/ 0, 4296 Args, NumArgs, CandidateSet); 4297 else 4298 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4299 Args, NumArgs, CandidateSet); 4300 } 4301 } 4302} 4303 4304/// \brief Attempt to perform initialization by constructor 4305/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4306/// copy-initialization. 4307/// 4308/// This routine determines whether initialization by constructor is possible, 4309/// but it does not emit any diagnostics in the case where the initialization 4310/// is ill-formed. 4311/// 4312/// \param ClassType the type of the object being initialized, which must have 4313/// class type. 4314/// 4315/// \param Args the arguments provided to initialize the object 4316/// 4317/// \param NumArgs the number of arguments provided to initialize the object 4318/// 4319/// \param Kind the type of initialization being performed 4320/// 4321/// \returns the constructor used to initialize the object, if successful. 4322/// Otherwise, emits a diagnostic and returns NULL. 4323CXXConstructorDecl * 4324Sema::TryInitializationByConstructor(QualType ClassType, 4325 Expr **Args, unsigned NumArgs, 4326 SourceLocation Loc, 4327 InitializationKind Kind) { 4328 // Build the overload candidate set 4329 OverloadCandidateSet CandidateSet(Loc); 4330 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4331 CandidateSet); 4332 4333 // Determine whether we found a constructor we can use. 4334 OverloadCandidateSet::iterator Best; 4335 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4336 case OR_Success: 4337 case OR_Deleted: 4338 // We found a constructor. Return it. 4339 return cast<CXXConstructorDecl>(Best->Function); 4340 4341 case OR_No_Viable_Function: 4342 case OR_Ambiguous: 4343 // Overload resolution failed. Return nothing. 4344 return 0; 4345 } 4346 4347 // Silence GCC warning 4348 return 0; 4349} 4350 4351/// \brief Given a constructor and the set of arguments provided for the 4352/// constructor, convert the arguments and add any required default arguments 4353/// to form a proper call to this constructor. 4354/// 4355/// \returns true if an error occurred, false otherwise. 4356bool 4357Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4358 MultiExprArg ArgsPtr, 4359 SourceLocation Loc, 4360 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4361 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4362 unsigned NumArgs = ArgsPtr.size(); 4363 Expr **Args = (Expr **)ArgsPtr.get(); 4364 4365 const FunctionProtoType *Proto 4366 = Constructor->getType()->getAs<FunctionProtoType>(); 4367 assert(Proto && "Constructor without a prototype?"); 4368 unsigned NumArgsInProto = Proto->getNumArgs(); 4369 4370 // If too few arguments are available, we'll fill in the rest with defaults. 4371 if (NumArgs < NumArgsInProto) 4372 ConvertedArgs.reserve(NumArgsInProto); 4373 else 4374 ConvertedArgs.reserve(NumArgs); 4375 4376 VariadicCallType CallType = 4377 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4378 llvm::SmallVector<Expr *, 8> AllArgs; 4379 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4380 Proto, 0, Args, NumArgs, AllArgs, 4381 CallType); 4382 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4383 ConvertedArgs.push_back(AllArgs[i]); 4384 return Invalid; 4385} 4386 4387/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4388/// determine whether they are reference-related, 4389/// reference-compatible, reference-compatible with added 4390/// qualification, or incompatible, for use in C++ initialization by 4391/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4392/// type, and the first type (T1) is the pointee type of the reference 4393/// type being initialized. 4394Sema::ReferenceCompareResult 4395Sema::CompareReferenceRelationship(SourceLocation Loc, 4396 QualType OrigT1, QualType OrigT2, 4397 bool& DerivedToBase) { 4398 assert(!OrigT1->isReferenceType() && 4399 "T1 must be the pointee type of the reference type"); 4400 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4401 4402 QualType T1 = Context.getCanonicalType(OrigT1); 4403 QualType T2 = Context.getCanonicalType(OrigT2); 4404 Qualifiers T1Quals, T2Quals; 4405 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4406 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4407 4408 // C++ [dcl.init.ref]p4: 4409 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4410 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4411 // T1 is a base class of T2. 4412 if (UnqualT1 == UnqualT2) 4413 DerivedToBase = false; 4414 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4415 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4416 IsDerivedFrom(UnqualT2, UnqualT1)) 4417 DerivedToBase = true; 4418 else 4419 return Ref_Incompatible; 4420 4421 // At this point, we know that T1 and T2 are reference-related (at 4422 // least). 4423 4424 // If the type is an array type, promote the element qualifiers to the type 4425 // for comparison. 4426 if (isa<ArrayType>(T1) && T1Quals) 4427 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4428 if (isa<ArrayType>(T2) && T2Quals) 4429 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4430 4431 // C++ [dcl.init.ref]p4: 4432 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4433 // reference-related to T2 and cv1 is the same cv-qualification 4434 // as, or greater cv-qualification than, cv2. For purposes of 4435 // overload resolution, cases for which cv1 is greater 4436 // cv-qualification than cv2 are identified as 4437 // reference-compatible with added qualification (see 13.3.3.2). 4438 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4439 return Ref_Compatible; 4440 else if (T1.isMoreQualifiedThan(T2)) 4441 return Ref_Compatible_With_Added_Qualification; 4442 else 4443 return Ref_Related; 4444} 4445 4446/// CheckReferenceInit - Check the initialization of a reference 4447/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4448/// the initializer (either a simple initializer or an initializer 4449/// list), and DeclType is the type of the declaration. When ICS is 4450/// non-null, this routine will compute the implicit conversion 4451/// sequence according to C++ [over.ics.ref] and will not produce any 4452/// diagnostics; when ICS is null, it will emit diagnostics when any 4453/// errors are found. Either way, a return value of true indicates 4454/// that there was a failure, a return value of false indicates that 4455/// the reference initialization succeeded. 4456/// 4457/// When @p SuppressUserConversions, user-defined conversions are 4458/// suppressed. 4459/// When @p AllowExplicit, we also permit explicit user-defined 4460/// conversion functions. 4461/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4462/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4463/// This is used when this is called from a C-style cast. 4464bool 4465Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4466 SourceLocation DeclLoc, 4467 bool SuppressUserConversions, 4468 bool AllowExplicit, bool ForceRValue, 4469 ImplicitConversionSequence *ICS, 4470 bool IgnoreBaseAccess) { 4471 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4472 4473 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4474 QualType T2 = Init->getType(); 4475 4476 // If the initializer is the address of an overloaded function, try 4477 // to resolve the overloaded function. If all goes well, T2 is the 4478 // type of the resulting function. 4479 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4480 DeclAccessPair Found; 4481 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4482 ICS != 0, Found); 4483 if (Fn) { 4484 // Since we're performing this reference-initialization for 4485 // real, update the initializer with the resulting function. 4486 if (!ICS) { 4487 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4488 return true; 4489 4490 CheckAddressOfMemberAccess(Init, Found); 4491 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4492 } 4493 4494 T2 = Fn->getType(); 4495 } 4496 } 4497 4498 // Compute some basic properties of the types and the initializer. 4499 bool isRValRef = DeclType->isRValueReferenceType(); 4500 bool DerivedToBase = false; 4501 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4502 Init->isLvalue(Context); 4503 ReferenceCompareResult RefRelationship 4504 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4505 4506 // Most paths end in a failed conversion. 4507 if (ICS) { 4508 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4509 } 4510 4511 // C++ [dcl.init.ref]p5: 4512 // A reference to type "cv1 T1" is initialized by an expression 4513 // of type "cv2 T2" as follows: 4514 4515 // -- If the initializer expression 4516 4517 // Rvalue references cannot bind to lvalues (N2812). 4518 // There is absolutely no situation where they can. In particular, note that 4519 // this is ill-formed, even if B has a user-defined conversion to A&&: 4520 // B b; 4521 // A&& r = b; 4522 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4523 if (!ICS) 4524 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4525 << Init->getSourceRange(); 4526 return true; 4527 } 4528 4529 bool BindsDirectly = false; 4530 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4531 // reference-compatible with "cv2 T2," or 4532 // 4533 // Note that the bit-field check is skipped if we are just computing 4534 // the implicit conversion sequence (C++ [over.best.ics]p2). 4535 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4536 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4537 BindsDirectly = true; 4538 4539 if (ICS) { 4540 // C++ [over.ics.ref]p1: 4541 // When a parameter of reference type binds directly (8.5.3) 4542 // to an argument expression, the implicit conversion sequence 4543 // is the identity conversion, unless the argument expression 4544 // has a type that is a derived class of the parameter type, 4545 // in which case the implicit conversion sequence is a 4546 // derived-to-base Conversion (13.3.3.1). 4547 ICS->setStandard(); 4548 ICS->Standard.First = ICK_Identity; 4549 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4550 ICS->Standard.Third = ICK_Identity; 4551 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4552 ICS->Standard.setToType(0, T2); 4553 ICS->Standard.setToType(1, T1); 4554 ICS->Standard.setToType(2, T1); 4555 ICS->Standard.ReferenceBinding = true; 4556 ICS->Standard.DirectBinding = true; 4557 ICS->Standard.RRefBinding = false; 4558 ICS->Standard.CopyConstructor = 0; 4559 4560 // Nothing more to do: the inaccessibility/ambiguity check for 4561 // derived-to-base conversions is suppressed when we're 4562 // computing the implicit conversion sequence (C++ 4563 // [over.best.ics]p2). 4564 return false; 4565 } else { 4566 // Perform the conversion. 4567 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4568 if (DerivedToBase) 4569 CK = CastExpr::CK_DerivedToBase; 4570 else if(CheckExceptionSpecCompatibility(Init, T1)) 4571 return true; 4572 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4573 } 4574 } 4575 4576 // -- has a class type (i.e., T2 is a class type) and can be 4577 // implicitly converted to an lvalue of type "cv3 T3," 4578 // where "cv1 T1" is reference-compatible with "cv3 T3" 4579 // 92) (this conversion is selected by enumerating the 4580 // applicable conversion functions (13.3.1.6) and choosing 4581 // the best one through overload resolution (13.3)), 4582 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4583 !RequireCompleteType(DeclLoc, T2, 0)) { 4584 CXXRecordDecl *T2RecordDecl 4585 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4586 4587 OverloadCandidateSet CandidateSet(DeclLoc); 4588 const UnresolvedSetImpl *Conversions 4589 = T2RecordDecl->getVisibleConversionFunctions(); 4590 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4591 E = Conversions->end(); I != E; ++I) { 4592 NamedDecl *D = *I; 4593 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4594 if (isa<UsingShadowDecl>(D)) 4595 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4596 4597 FunctionTemplateDecl *ConvTemplate 4598 = dyn_cast<FunctionTemplateDecl>(D); 4599 CXXConversionDecl *Conv; 4600 if (ConvTemplate) 4601 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4602 else 4603 Conv = cast<CXXConversionDecl>(D); 4604 4605 // If the conversion function doesn't return a reference type, 4606 // it can't be considered for this conversion. 4607 if (Conv->getConversionType()->isLValueReferenceType() && 4608 (AllowExplicit || !Conv->isExplicit())) { 4609 if (ConvTemplate) 4610 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4611 Init, DeclType, CandidateSet); 4612 else 4613 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4614 DeclType, CandidateSet); 4615 } 4616 } 4617 4618 OverloadCandidateSet::iterator Best; 4619 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4620 case OR_Success: 4621 // C++ [over.ics.ref]p1: 4622 // 4623 // [...] If the parameter binds directly to the result of 4624 // applying a conversion function to the argument 4625 // expression, the implicit conversion sequence is a 4626 // user-defined conversion sequence (13.3.3.1.2), with the 4627 // second standard conversion sequence either an identity 4628 // conversion or, if the conversion function returns an 4629 // entity of a type that is a derived class of the parameter 4630 // type, a derived-to-base Conversion. 4631 if (!Best->FinalConversion.DirectBinding) 4632 break; 4633 4634 // This is a direct binding. 4635 BindsDirectly = true; 4636 4637 if (ICS) { 4638 ICS->setUserDefined(); 4639 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4640 ICS->UserDefined.After = Best->FinalConversion; 4641 ICS->UserDefined.ConversionFunction = Best->Function; 4642 ICS->UserDefined.EllipsisConversion = false; 4643 assert(ICS->UserDefined.After.ReferenceBinding && 4644 ICS->UserDefined.After.DirectBinding && 4645 "Expected a direct reference binding!"); 4646 return false; 4647 } else { 4648 OwningExprResult InitConversion = 4649 BuildCXXCastArgument(DeclLoc, QualType(), 4650 CastExpr::CK_UserDefinedConversion, 4651 cast<CXXMethodDecl>(Best->Function), 4652 Owned(Init)); 4653 Init = InitConversion.takeAs<Expr>(); 4654 4655 if (CheckExceptionSpecCompatibility(Init, T1)) 4656 return true; 4657 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4658 /*isLvalue=*/true); 4659 } 4660 break; 4661 4662 case OR_Ambiguous: 4663 if (ICS) { 4664 ICS->setAmbiguous(); 4665 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4666 Cand != CandidateSet.end(); ++Cand) 4667 if (Cand->Viable) 4668 ICS->Ambiguous.addConversion(Cand->Function); 4669 break; 4670 } 4671 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4672 << Init->getSourceRange(); 4673 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4674 return true; 4675 4676 case OR_No_Viable_Function: 4677 case OR_Deleted: 4678 // There was no suitable conversion, or we found a deleted 4679 // conversion; continue with other checks. 4680 break; 4681 } 4682 } 4683 4684 if (BindsDirectly) { 4685 // C++ [dcl.init.ref]p4: 4686 // [...] In all cases where the reference-related or 4687 // reference-compatible relationship of two types is used to 4688 // establish the validity of a reference binding, and T1 is a 4689 // base class of T2, a program that necessitates such a binding 4690 // is ill-formed if T1 is an inaccessible (clause 11) or 4691 // ambiguous (10.2) base class of T2. 4692 // 4693 // Note that we only check this condition when we're allowed to 4694 // complain about errors, because we should not be checking for 4695 // ambiguity (or inaccessibility) unless the reference binding 4696 // actually happens. 4697 if (DerivedToBase) 4698 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4699 Init->getSourceRange(), 4700 IgnoreBaseAccess); 4701 else 4702 return false; 4703 } 4704 4705 // -- Otherwise, the reference shall be to a non-volatile const 4706 // type (i.e., cv1 shall be const), or the reference shall be an 4707 // rvalue reference and the initializer expression shall be an rvalue. 4708 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4709 if (!ICS) 4710 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4711 << T1.isVolatileQualified() 4712 << T1 << int(InitLvalue != Expr::LV_Valid) 4713 << T2 << Init->getSourceRange(); 4714 return true; 4715 } 4716 4717 // -- If the initializer expression is an rvalue, with T2 a 4718 // class type, and "cv1 T1" is reference-compatible with 4719 // "cv2 T2," the reference is bound in one of the 4720 // following ways (the choice is implementation-defined): 4721 // 4722 // -- The reference is bound to the object represented by 4723 // the rvalue (see 3.10) or to a sub-object within that 4724 // object. 4725 // 4726 // -- A temporary of type "cv1 T2" [sic] is created, and 4727 // a constructor is called to copy the entire rvalue 4728 // object into the temporary. The reference is bound to 4729 // the temporary or to a sub-object within the 4730 // temporary. 4731 // 4732 // The constructor that would be used to make the copy 4733 // shall be callable whether or not the copy is actually 4734 // done. 4735 // 4736 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4737 // freedom, so we will always take the first option and never build 4738 // a temporary in this case. FIXME: We will, however, have to check 4739 // for the presence of a copy constructor in C++98/03 mode. 4740 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4741 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4742 if (ICS) { 4743 ICS->setStandard(); 4744 ICS->Standard.First = ICK_Identity; 4745 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4746 ICS->Standard.Third = ICK_Identity; 4747 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4748 ICS->Standard.setToType(0, T2); 4749 ICS->Standard.setToType(1, T1); 4750 ICS->Standard.setToType(2, T1); 4751 ICS->Standard.ReferenceBinding = true; 4752 ICS->Standard.DirectBinding = false; 4753 ICS->Standard.RRefBinding = isRValRef; 4754 ICS->Standard.CopyConstructor = 0; 4755 } else { 4756 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4757 if (DerivedToBase) 4758 CK = CastExpr::CK_DerivedToBase; 4759 else if(CheckExceptionSpecCompatibility(Init, T1)) 4760 return true; 4761 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4762 } 4763 return false; 4764 } 4765 4766 // -- Otherwise, a temporary of type "cv1 T1" is created and 4767 // initialized from the initializer expression using the 4768 // rules for a non-reference copy initialization (8.5). The 4769 // reference is then bound to the temporary. If T1 is 4770 // reference-related to T2, cv1 must be the same 4771 // cv-qualification as, or greater cv-qualification than, 4772 // cv2; otherwise, the program is ill-formed. 4773 if (RefRelationship == Ref_Related) { 4774 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4775 // we would be reference-compatible or reference-compatible with 4776 // added qualification. But that wasn't the case, so the reference 4777 // initialization fails. 4778 if (!ICS) 4779 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4780 << T1 << int(InitLvalue != Expr::LV_Valid) 4781 << T2 << Init->getSourceRange(); 4782 return true; 4783 } 4784 4785 // If at least one of the types is a class type, the types are not 4786 // related, and we aren't allowed any user conversions, the 4787 // reference binding fails. This case is important for breaking 4788 // recursion, since TryImplicitConversion below will attempt to 4789 // create a temporary through the use of a copy constructor. 4790 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4791 (T1->isRecordType() || T2->isRecordType())) { 4792 if (!ICS) 4793 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4794 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4795 return true; 4796 } 4797 4798 // Actually try to convert the initializer to T1. 4799 if (ICS) { 4800 // C++ [over.ics.ref]p2: 4801 // 4802 // When a parameter of reference type is not bound directly to 4803 // an argument expression, the conversion sequence is the one 4804 // required to convert the argument expression to the 4805 // underlying type of the reference according to 4806 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4807 // to copy-initializing a temporary of the underlying type with 4808 // the argument expression. Any difference in top-level 4809 // cv-qualification is subsumed by the initialization itself 4810 // and does not constitute a conversion. 4811 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4812 /*AllowExplicit=*/false, 4813 /*ForceRValue=*/false, 4814 /*InOverloadResolution=*/false); 4815 4816 // Of course, that's still a reference binding. 4817 if (ICS->isStandard()) { 4818 ICS->Standard.ReferenceBinding = true; 4819 ICS->Standard.RRefBinding = isRValRef; 4820 } else if (ICS->isUserDefined()) { 4821 ICS->UserDefined.After.ReferenceBinding = true; 4822 ICS->UserDefined.After.RRefBinding = isRValRef; 4823 } 4824 return ICS->isBad(); 4825 } else { 4826 ImplicitConversionSequence Conversions; 4827 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4828 false, false, 4829 Conversions); 4830 if (badConversion) { 4831 if (Conversions.isAmbiguous()) { 4832 Diag(DeclLoc, 4833 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4834 for (int j = Conversions.Ambiguous.conversions().size()-1; 4835 j >= 0; j--) { 4836 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4837 NoteOverloadCandidate(Func); 4838 } 4839 } 4840 else { 4841 if (isRValRef) 4842 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4843 << Init->getSourceRange(); 4844 else 4845 Diag(DeclLoc, diag::err_invalid_initialization) 4846 << DeclType << Init->getType() << Init->getSourceRange(); 4847 } 4848 } 4849 return badConversion; 4850 } 4851} 4852 4853static inline bool 4854CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4855 const FunctionDecl *FnDecl) { 4856 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4857 if (isa<NamespaceDecl>(DC)) { 4858 return SemaRef.Diag(FnDecl->getLocation(), 4859 diag::err_operator_new_delete_declared_in_namespace) 4860 << FnDecl->getDeclName(); 4861 } 4862 4863 if (isa<TranslationUnitDecl>(DC) && 4864 FnDecl->getStorageClass() == FunctionDecl::Static) { 4865 return SemaRef.Diag(FnDecl->getLocation(), 4866 diag::err_operator_new_delete_declared_static) 4867 << FnDecl->getDeclName(); 4868 } 4869 4870 return false; 4871} 4872 4873static inline bool 4874CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4875 CanQualType ExpectedResultType, 4876 CanQualType ExpectedFirstParamType, 4877 unsigned DependentParamTypeDiag, 4878 unsigned InvalidParamTypeDiag) { 4879 QualType ResultType = 4880 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4881 4882 // Check that the result type is not dependent. 4883 if (ResultType->isDependentType()) 4884 return SemaRef.Diag(FnDecl->getLocation(), 4885 diag::err_operator_new_delete_dependent_result_type) 4886 << FnDecl->getDeclName() << ExpectedResultType; 4887 4888 // Check that the result type is what we expect. 4889 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4890 return SemaRef.Diag(FnDecl->getLocation(), 4891 diag::err_operator_new_delete_invalid_result_type) 4892 << FnDecl->getDeclName() << ExpectedResultType; 4893 4894 // A function template must have at least 2 parameters. 4895 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4896 return SemaRef.Diag(FnDecl->getLocation(), 4897 diag::err_operator_new_delete_template_too_few_parameters) 4898 << FnDecl->getDeclName(); 4899 4900 // The function decl must have at least 1 parameter. 4901 if (FnDecl->getNumParams() == 0) 4902 return SemaRef.Diag(FnDecl->getLocation(), 4903 diag::err_operator_new_delete_too_few_parameters) 4904 << FnDecl->getDeclName(); 4905 4906 // Check the the first parameter type is not dependent. 4907 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4908 if (FirstParamType->isDependentType()) 4909 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4910 << FnDecl->getDeclName() << ExpectedFirstParamType; 4911 4912 // Check that the first parameter type is what we expect. 4913 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4914 ExpectedFirstParamType) 4915 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4916 << FnDecl->getDeclName() << ExpectedFirstParamType; 4917 4918 return false; 4919} 4920 4921static bool 4922CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4923 // C++ [basic.stc.dynamic.allocation]p1: 4924 // A program is ill-formed if an allocation function is declared in a 4925 // namespace scope other than global scope or declared static in global 4926 // scope. 4927 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4928 return true; 4929 4930 CanQualType SizeTy = 4931 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4932 4933 // C++ [basic.stc.dynamic.allocation]p1: 4934 // The return type shall be void*. The first parameter shall have type 4935 // std::size_t. 4936 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4937 SizeTy, 4938 diag::err_operator_new_dependent_param_type, 4939 diag::err_operator_new_param_type)) 4940 return true; 4941 4942 // C++ [basic.stc.dynamic.allocation]p1: 4943 // The first parameter shall not have an associated default argument. 4944 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4945 return SemaRef.Diag(FnDecl->getLocation(), 4946 diag::err_operator_new_default_arg) 4947 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4948 4949 return false; 4950} 4951 4952static bool 4953CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4954 // C++ [basic.stc.dynamic.deallocation]p1: 4955 // A program is ill-formed if deallocation functions are declared in a 4956 // namespace scope other than global scope or declared static in global 4957 // scope. 4958 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4959 return true; 4960 4961 // C++ [basic.stc.dynamic.deallocation]p2: 4962 // Each deallocation function shall return void and its first parameter 4963 // shall be void*. 4964 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4965 SemaRef.Context.VoidPtrTy, 4966 diag::err_operator_delete_dependent_param_type, 4967 diag::err_operator_delete_param_type)) 4968 return true; 4969 4970 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4971 if (FirstParamType->isDependentType()) 4972 return SemaRef.Diag(FnDecl->getLocation(), 4973 diag::err_operator_delete_dependent_param_type) 4974 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4975 4976 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4977 SemaRef.Context.VoidPtrTy) 4978 return SemaRef.Diag(FnDecl->getLocation(), 4979 diag::err_operator_delete_param_type) 4980 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4981 4982 return false; 4983} 4984 4985/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4986/// of this overloaded operator is well-formed. If so, returns false; 4987/// otherwise, emits appropriate diagnostics and returns true. 4988bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4989 assert(FnDecl && FnDecl->isOverloadedOperator() && 4990 "Expected an overloaded operator declaration"); 4991 4992 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4993 4994 // C++ [over.oper]p5: 4995 // The allocation and deallocation functions, operator new, 4996 // operator new[], operator delete and operator delete[], are 4997 // described completely in 3.7.3. The attributes and restrictions 4998 // found in the rest of this subclause do not apply to them unless 4999 // explicitly stated in 3.7.3. 5000 if (Op == OO_Delete || Op == OO_Array_Delete) 5001 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5002 5003 if (Op == OO_New || Op == OO_Array_New) 5004 return CheckOperatorNewDeclaration(*this, FnDecl); 5005 5006 // C++ [over.oper]p6: 5007 // An operator function shall either be a non-static member 5008 // function or be a non-member function and have at least one 5009 // parameter whose type is a class, a reference to a class, an 5010 // enumeration, or a reference to an enumeration. 5011 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5012 if (MethodDecl->isStatic()) 5013 return Diag(FnDecl->getLocation(), 5014 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5015 } else { 5016 bool ClassOrEnumParam = false; 5017 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5018 ParamEnd = FnDecl->param_end(); 5019 Param != ParamEnd; ++Param) { 5020 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5021 if (ParamType->isDependentType() || ParamType->isRecordType() || 5022 ParamType->isEnumeralType()) { 5023 ClassOrEnumParam = true; 5024 break; 5025 } 5026 } 5027 5028 if (!ClassOrEnumParam) 5029 return Diag(FnDecl->getLocation(), 5030 diag::err_operator_overload_needs_class_or_enum) 5031 << FnDecl->getDeclName(); 5032 } 5033 5034 // C++ [over.oper]p8: 5035 // An operator function cannot have default arguments (8.3.6), 5036 // except where explicitly stated below. 5037 // 5038 // Only the function-call operator allows default arguments 5039 // (C++ [over.call]p1). 5040 if (Op != OO_Call) { 5041 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5042 Param != FnDecl->param_end(); ++Param) { 5043 if ((*Param)->hasDefaultArg()) 5044 return Diag((*Param)->getLocation(), 5045 diag::err_operator_overload_default_arg) 5046 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5047 } 5048 } 5049 5050 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5051 { false, false, false } 5052#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5053 , { Unary, Binary, MemberOnly } 5054#include "clang/Basic/OperatorKinds.def" 5055 }; 5056 5057 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5058 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5059 bool MustBeMemberOperator = OperatorUses[Op][2]; 5060 5061 // C++ [over.oper]p8: 5062 // [...] Operator functions cannot have more or fewer parameters 5063 // than the number required for the corresponding operator, as 5064 // described in the rest of this subclause. 5065 unsigned NumParams = FnDecl->getNumParams() 5066 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5067 if (Op != OO_Call && 5068 ((NumParams == 1 && !CanBeUnaryOperator) || 5069 (NumParams == 2 && !CanBeBinaryOperator) || 5070 (NumParams < 1) || (NumParams > 2))) { 5071 // We have the wrong number of parameters. 5072 unsigned ErrorKind; 5073 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5074 ErrorKind = 2; // 2 -> unary or binary. 5075 } else if (CanBeUnaryOperator) { 5076 ErrorKind = 0; // 0 -> unary 5077 } else { 5078 assert(CanBeBinaryOperator && 5079 "All non-call overloaded operators are unary or binary!"); 5080 ErrorKind = 1; // 1 -> binary 5081 } 5082 5083 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5084 << FnDecl->getDeclName() << NumParams << ErrorKind; 5085 } 5086 5087 // Overloaded operators other than operator() cannot be variadic. 5088 if (Op != OO_Call && 5089 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5090 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5091 << FnDecl->getDeclName(); 5092 } 5093 5094 // Some operators must be non-static member functions. 5095 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5096 return Diag(FnDecl->getLocation(), 5097 diag::err_operator_overload_must_be_member) 5098 << FnDecl->getDeclName(); 5099 } 5100 5101 // C++ [over.inc]p1: 5102 // The user-defined function called operator++ implements the 5103 // prefix and postfix ++ operator. If this function is a member 5104 // function with no parameters, or a non-member function with one 5105 // parameter of class or enumeration type, it defines the prefix 5106 // increment operator ++ for objects of that type. If the function 5107 // is a member function with one parameter (which shall be of type 5108 // int) or a non-member function with two parameters (the second 5109 // of which shall be of type int), it defines the postfix 5110 // increment operator ++ for objects of that type. 5111 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5112 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5113 bool ParamIsInt = false; 5114 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5115 ParamIsInt = BT->getKind() == BuiltinType::Int; 5116 5117 if (!ParamIsInt) 5118 return Diag(LastParam->getLocation(), 5119 diag::err_operator_overload_post_incdec_must_be_int) 5120 << LastParam->getType() << (Op == OO_MinusMinus); 5121 } 5122 5123 // Notify the class if it got an assignment operator. 5124 if (Op == OO_Equal) { 5125 // Would have returned earlier otherwise. 5126 assert(isa<CXXMethodDecl>(FnDecl) && 5127 "Overloaded = not member, but not filtered."); 5128 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5129 Method->getParent()->addedAssignmentOperator(Context, Method); 5130 } 5131 5132 return false; 5133} 5134 5135/// CheckLiteralOperatorDeclaration - Check whether the declaration 5136/// of this literal operator function is well-formed. If so, returns 5137/// false; otherwise, emits appropriate diagnostics and returns true. 5138bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5139 DeclContext *DC = FnDecl->getDeclContext(); 5140 Decl::Kind Kind = DC->getDeclKind(); 5141 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5142 Kind != Decl::LinkageSpec) { 5143 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5144 << FnDecl->getDeclName(); 5145 return true; 5146 } 5147 5148 bool Valid = false; 5149 5150 // template <char...> type operator "" name() is the only valid template 5151 // signature, and the only valid signature with no parameters. 5152 if (FnDecl->param_size() == 0) { 5153 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5154 // Must have only one template parameter 5155 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5156 if (Params->size() == 1) { 5157 NonTypeTemplateParmDecl *PmDecl = 5158 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5159 5160 // The template parameter must be a char parameter pack. 5161 // FIXME: This test will always fail because non-type parameter packs 5162 // have not been implemented. 5163 if (PmDecl && PmDecl->isTemplateParameterPack() && 5164 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5165 Valid = true; 5166 } 5167 } 5168 } else { 5169 // Check the first parameter 5170 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5171 5172 QualType T = (*Param)->getType(); 5173 5174 // unsigned long long int, long double, and any character type are allowed 5175 // as the only parameters. 5176 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5177 Context.hasSameType(T, Context.LongDoubleTy) || 5178 Context.hasSameType(T, Context.CharTy) || 5179 Context.hasSameType(T, Context.WCharTy) || 5180 Context.hasSameType(T, Context.Char16Ty) || 5181 Context.hasSameType(T, Context.Char32Ty)) { 5182 if (++Param == FnDecl->param_end()) 5183 Valid = true; 5184 goto FinishedParams; 5185 } 5186 5187 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5188 const PointerType *PT = T->getAs<PointerType>(); 5189 if (!PT) 5190 goto FinishedParams; 5191 T = PT->getPointeeType(); 5192 if (!T.isConstQualified()) 5193 goto FinishedParams; 5194 T = T.getUnqualifiedType(); 5195 5196 // Move on to the second parameter; 5197 ++Param; 5198 5199 // If there is no second parameter, the first must be a const char * 5200 if (Param == FnDecl->param_end()) { 5201 if (Context.hasSameType(T, Context.CharTy)) 5202 Valid = true; 5203 goto FinishedParams; 5204 } 5205 5206 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5207 // are allowed as the first parameter to a two-parameter function 5208 if (!(Context.hasSameType(T, Context.CharTy) || 5209 Context.hasSameType(T, Context.WCharTy) || 5210 Context.hasSameType(T, Context.Char16Ty) || 5211 Context.hasSameType(T, Context.Char32Ty))) 5212 goto FinishedParams; 5213 5214 // The second and final parameter must be an std::size_t 5215 T = (*Param)->getType().getUnqualifiedType(); 5216 if (Context.hasSameType(T, Context.getSizeType()) && 5217 ++Param == FnDecl->param_end()) 5218 Valid = true; 5219 } 5220 5221 // FIXME: This diagnostic is absolutely terrible. 5222FinishedParams: 5223 if (!Valid) { 5224 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5225 << FnDecl->getDeclName(); 5226 return true; 5227 } 5228 5229 return false; 5230} 5231 5232/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5233/// linkage specification, including the language and (if present) 5234/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5235/// the location of the language string literal, which is provided 5236/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5237/// the '{' brace. Otherwise, this linkage specification does not 5238/// have any braces. 5239Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5240 SourceLocation ExternLoc, 5241 SourceLocation LangLoc, 5242 const char *Lang, 5243 unsigned StrSize, 5244 SourceLocation LBraceLoc) { 5245 LinkageSpecDecl::LanguageIDs Language; 5246 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5247 Language = LinkageSpecDecl::lang_c; 5248 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5249 Language = LinkageSpecDecl::lang_cxx; 5250 else { 5251 Diag(LangLoc, diag::err_bad_language); 5252 return DeclPtrTy(); 5253 } 5254 5255 // FIXME: Add all the various semantics of linkage specifications 5256 5257 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5258 LangLoc, Language, 5259 LBraceLoc.isValid()); 5260 CurContext->addDecl(D); 5261 PushDeclContext(S, D); 5262 return DeclPtrTy::make(D); 5263} 5264 5265/// ActOnFinishLinkageSpecification - Completely the definition of 5266/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5267/// valid, it's the position of the closing '}' brace in a linkage 5268/// specification that uses braces. 5269Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5270 DeclPtrTy LinkageSpec, 5271 SourceLocation RBraceLoc) { 5272 if (LinkageSpec) 5273 PopDeclContext(); 5274 return LinkageSpec; 5275} 5276 5277/// \brief Perform semantic analysis for the variable declaration that 5278/// occurs within a C++ catch clause, returning the newly-created 5279/// variable. 5280VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5281 TypeSourceInfo *TInfo, 5282 IdentifierInfo *Name, 5283 SourceLocation Loc, 5284 SourceRange Range) { 5285 bool Invalid = false; 5286 5287 // Arrays and functions decay. 5288 if (ExDeclType->isArrayType()) 5289 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5290 else if (ExDeclType->isFunctionType()) 5291 ExDeclType = Context.getPointerType(ExDeclType); 5292 5293 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5294 // The exception-declaration shall not denote a pointer or reference to an 5295 // incomplete type, other than [cv] void*. 5296 // N2844 forbids rvalue references. 5297 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5298 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5299 Invalid = true; 5300 } 5301 5302 // GCC allows catching pointers and references to incomplete types 5303 // as an extension; so do we, but we warn by default. 5304 5305 QualType BaseType = ExDeclType; 5306 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5307 unsigned DK = diag::err_catch_incomplete; 5308 bool IncompleteCatchIsInvalid = true; 5309 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5310 BaseType = Ptr->getPointeeType(); 5311 Mode = 1; 5312 DK = diag::ext_catch_incomplete_ptr; 5313 IncompleteCatchIsInvalid = false; 5314 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5315 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5316 BaseType = Ref->getPointeeType(); 5317 Mode = 2; 5318 DK = diag::ext_catch_incomplete_ref; 5319 IncompleteCatchIsInvalid = false; 5320 } 5321 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5322 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5323 IncompleteCatchIsInvalid) 5324 Invalid = true; 5325 5326 if (!Invalid && !ExDeclType->isDependentType() && 5327 RequireNonAbstractType(Loc, ExDeclType, 5328 diag::err_abstract_type_in_decl, 5329 AbstractVariableType)) 5330 Invalid = true; 5331 5332 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5333 Name, ExDeclType, TInfo, VarDecl::None); 5334 5335 if (!Invalid) { 5336 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5337 // C++ [except.handle]p16: 5338 // The object declared in an exception-declaration or, if the 5339 // exception-declaration does not specify a name, a temporary (12.2) is 5340 // copy-initialized (8.5) from the exception object. [...] 5341 // The object is destroyed when the handler exits, after the destruction 5342 // of any automatic objects initialized within the handler. 5343 // 5344 // We just pretend to initialize the object with itself, then make sure 5345 // it can be destroyed later. 5346 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5347 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5348 Loc, ExDeclType, 0); 5349 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5350 SourceLocation()); 5351 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5352 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5353 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5354 if (Result.isInvalid()) 5355 Invalid = true; 5356 else 5357 FinalizeVarWithDestructor(ExDecl, RecordTy); 5358 } 5359 } 5360 5361 if (Invalid) 5362 ExDecl->setInvalidDecl(); 5363 5364 return ExDecl; 5365} 5366 5367/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5368/// handler. 5369Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5370 TypeSourceInfo *TInfo = 0; 5371 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5372 5373 bool Invalid = D.isInvalidType(); 5374 IdentifierInfo *II = D.getIdentifier(); 5375 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5376 // The scope should be freshly made just for us. There is just no way 5377 // it contains any previous declaration. 5378 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5379 if (PrevDecl->isTemplateParameter()) { 5380 // Maybe we will complain about the shadowed template parameter. 5381 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5382 } 5383 } 5384 5385 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5386 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5387 << D.getCXXScopeSpec().getRange(); 5388 Invalid = true; 5389 } 5390 5391 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5392 D.getIdentifier(), 5393 D.getIdentifierLoc(), 5394 D.getDeclSpec().getSourceRange()); 5395 5396 if (Invalid) 5397 ExDecl->setInvalidDecl(); 5398 5399 // Add the exception declaration into this scope. 5400 if (II) 5401 PushOnScopeChains(ExDecl, S); 5402 else 5403 CurContext->addDecl(ExDecl); 5404 5405 ProcessDeclAttributes(S, ExDecl, D); 5406 return DeclPtrTy::make(ExDecl); 5407} 5408 5409Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5410 ExprArg assertexpr, 5411 ExprArg assertmessageexpr) { 5412 Expr *AssertExpr = (Expr *)assertexpr.get(); 5413 StringLiteral *AssertMessage = 5414 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5415 5416 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5417 llvm::APSInt Value(32); 5418 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5419 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5420 AssertExpr->getSourceRange(); 5421 return DeclPtrTy(); 5422 } 5423 5424 if (Value == 0) { 5425 Diag(AssertLoc, diag::err_static_assert_failed) 5426 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5427 } 5428 } 5429 5430 assertexpr.release(); 5431 assertmessageexpr.release(); 5432 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5433 AssertExpr, AssertMessage); 5434 5435 CurContext->addDecl(Decl); 5436 return DeclPtrTy::make(Decl); 5437} 5438 5439/// \brief Perform semantic analysis of the given friend type declaration. 5440/// 5441/// \returns A friend declaration that. 5442FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5443 TypeSourceInfo *TSInfo) { 5444 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5445 5446 QualType T = TSInfo->getType(); 5447 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5448 5449 if (!getLangOptions().CPlusPlus0x) { 5450 // C++03 [class.friend]p2: 5451 // An elaborated-type-specifier shall be used in a friend declaration 5452 // for a class.* 5453 // 5454 // * The class-key of the elaborated-type-specifier is required. 5455 if (!ActiveTemplateInstantiations.empty()) { 5456 // Do not complain about the form of friend template types during 5457 // template instantiation; we will already have complained when the 5458 // template was declared. 5459 } else if (!T->isElaboratedTypeSpecifier()) { 5460 // If we evaluated the type to a record type, suggest putting 5461 // a tag in front. 5462 if (const RecordType *RT = T->getAs<RecordType>()) { 5463 RecordDecl *RD = RT->getDecl(); 5464 5465 std::string InsertionText = std::string(" ") + RD->getKindName(); 5466 5467 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5468 << (unsigned) RD->getTagKind() 5469 << T 5470 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5471 InsertionText); 5472 } else { 5473 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5474 << T 5475 << SourceRange(FriendLoc, TypeRange.getEnd()); 5476 } 5477 } else if (T->getAs<EnumType>()) { 5478 Diag(FriendLoc, diag::ext_enum_friend) 5479 << T 5480 << SourceRange(FriendLoc, TypeRange.getEnd()); 5481 } 5482 } 5483 5484 // C++0x [class.friend]p3: 5485 // If the type specifier in a friend declaration designates a (possibly 5486 // cv-qualified) class type, that class is declared as a friend; otherwise, 5487 // the friend declaration is ignored. 5488 5489 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5490 // in [class.friend]p3 that we do not implement. 5491 5492 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5493} 5494 5495/// Handle a friend type declaration. This works in tandem with 5496/// ActOnTag. 5497/// 5498/// Notes on friend class templates: 5499/// 5500/// We generally treat friend class declarations as if they were 5501/// declaring a class. So, for example, the elaborated type specifier 5502/// in a friend declaration is required to obey the restrictions of a 5503/// class-head (i.e. no typedefs in the scope chain), template 5504/// parameters are required to match up with simple template-ids, &c. 5505/// However, unlike when declaring a template specialization, it's 5506/// okay to refer to a template specialization without an empty 5507/// template parameter declaration, e.g. 5508/// friend class A<T>::B<unsigned>; 5509/// We permit this as a special case; if there are any template 5510/// parameters present at all, require proper matching, i.e. 5511/// template <> template <class T> friend class A<int>::B; 5512Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5513 MultiTemplateParamsArg TempParams) { 5514 SourceLocation Loc = DS.getSourceRange().getBegin(); 5515 5516 assert(DS.isFriendSpecified()); 5517 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5518 5519 // Try to convert the decl specifier to a type. This works for 5520 // friend templates because ActOnTag never produces a ClassTemplateDecl 5521 // for a TUK_Friend. 5522 Declarator TheDeclarator(DS, Declarator::MemberContext); 5523 TypeSourceInfo *TSI; 5524 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5525 if (TheDeclarator.isInvalidType()) 5526 return DeclPtrTy(); 5527 5528 if (!TSI) 5529 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5530 5531 // This is definitely an error in C++98. It's probably meant to 5532 // be forbidden in C++0x, too, but the specification is just 5533 // poorly written. 5534 // 5535 // The problem is with declarations like the following: 5536 // template <T> friend A<T>::foo; 5537 // where deciding whether a class C is a friend or not now hinges 5538 // on whether there exists an instantiation of A that causes 5539 // 'foo' to equal C. There are restrictions on class-heads 5540 // (which we declare (by fiat) elaborated friend declarations to 5541 // be) that makes this tractable. 5542 // 5543 // FIXME: handle "template <> friend class A<T>;", which 5544 // is possibly well-formed? Who even knows? 5545 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5546 Diag(Loc, diag::err_tagless_friend_type_template) 5547 << DS.getSourceRange(); 5548 return DeclPtrTy(); 5549 } 5550 5551 // C++98 [class.friend]p1: A friend of a class is a function 5552 // or class that is not a member of the class . . . 5553 // This is fixed in DR77, which just barely didn't make the C++03 5554 // deadline. It's also a very silly restriction that seriously 5555 // affects inner classes and which nobody else seems to implement; 5556 // thus we never diagnose it, not even in -pedantic. 5557 // 5558 // But note that we could warn about it: it's always useless to 5559 // friend one of your own members (it's not, however, worthless to 5560 // friend a member of an arbitrary specialization of your template). 5561 5562 Decl *D; 5563 if (unsigned NumTempParamLists = TempParams.size()) 5564 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5565 NumTempParamLists, 5566 (TemplateParameterList**) TempParams.release(), 5567 TSI, 5568 DS.getFriendSpecLoc()); 5569 else 5570 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5571 5572 if (!D) 5573 return DeclPtrTy(); 5574 5575 D->setAccess(AS_public); 5576 CurContext->addDecl(D); 5577 5578 return DeclPtrTy::make(D); 5579} 5580 5581Sema::DeclPtrTy 5582Sema::ActOnFriendFunctionDecl(Scope *S, 5583 Declarator &D, 5584 bool IsDefinition, 5585 MultiTemplateParamsArg TemplateParams) { 5586 const DeclSpec &DS = D.getDeclSpec(); 5587 5588 assert(DS.isFriendSpecified()); 5589 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5590 5591 SourceLocation Loc = D.getIdentifierLoc(); 5592 TypeSourceInfo *TInfo = 0; 5593 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5594 5595 // C++ [class.friend]p1 5596 // A friend of a class is a function or class.... 5597 // Note that this sees through typedefs, which is intended. 5598 // It *doesn't* see through dependent types, which is correct 5599 // according to [temp.arg.type]p3: 5600 // If a declaration acquires a function type through a 5601 // type dependent on a template-parameter and this causes 5602 // a declaration that does not use the syntactic form of a 5603 // function declarator to have a function type, the program 5604 // is ill-formed. 5605 if (!T->isFunctionType()) { 5606 Diag(Loc, diag::err_unexpected_friend); 5607 5608 // It might be worthwhile to try to recover by creating an 5609 // appropriate declaration. 5610 return DeclPtrTy(); 5611 } 5612 5613 // C++ [namespace.memdef]p3 5614 // - If a friend declaration in a non-local class first declares a 5615 // class or function, the friend class or function is a member 5616 // of the innermost enclosing namespace. 5617 // - The name of the friend is not found by simple name lookup 5618 // until a matching declaration is provided in that namespace 5619 // scope (either before or after the class declaration granting 5620 // friendship). 5621 // - If a friend function is called, its name may be found by the 5622 // name lookup that considers functions from namespaces and 5623 // classes associated with the types of the function arguments. 5624 // - When looking for a prior declaration of a class or a function 5625 // declared as a friend, scopes outside the innermost enclosing 5626 // namespace scope are not considered. 5627 5628 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5629 DeclarationName Name = GetNameForDeclarator(D); 5630 assert(Name); 5631 5632 // The context we found the declaration in, or in which we should 5633 // create the declaration. 5634 DeclContext *DC; 5635 5636 // FIXME: handle local classes 5637 5638 // Recover from invalid scope qualifiers as if they just weren't there. 5639 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5640 ForRedeclaration); 5641 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5642 // FIXME: RequireCompleteDeclContext 5643 DC = computeDeclContext(ScopeQual); 5644 5645 // FIXME: handle dependent contexts 5646 if (!DC) return DeclPtrTy(); 5647 5648 LookupQualifiedName(Previous, DC); 5649 5650 // If searching in that context implicitly found a declaration in 5651 // a different context, treat it like it wasn't found at all. 5652 // TODO: better diagnostics for this case. Suggesting the right 5653 // qualified scope would be nice... 5654 // FIXME: getRepresentativeDecl() is not right here at all 5655 if (Previous.empty() || 5656 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5657 D.setInvalidType(); 5658 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5659 return DeclPtrTy(); 5660 } 5661 5662 // C++ [class.friend]p1: A friend of a class is a function or 5663 // class that is not a member of the class . . . 5664 if (DC->Equals(CurContext)) 5665 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5666 5667 // Otherwise walk out to the nearest namespace scope looking for matches. 5668 } else { 5669 // TODO: handle local class contexts. 5670 5671 DC = CurContext; 5672 while (true) { 5673 // Skip class contexts. If someone can cite chapter and verse 5674 // for this behavior, that would be nice --- it's what GCC and 5675 // EDG do, and it seems like a reasonable intent, but the spec 5676 // really only says that checks for unqualified existing 5677 // declarations should stop at the nearest enclosing namespace, 5678 // not that they should only consider the nearest enclosing 5679 // namespace. 5680 while (DC->isRecord()) 5681 DC = DC->getParent(); 5682 5683 LookupQualifiedName(Previous, DC); 5684 5685 // TODO: decide what we think about using declarations. 5686 if (!Previous.empty()) 5687 break; 5688 5689 if (DC->isFileContext()) break; 5690 DC = DC->getParent(); 5691 } 5692 5693 // C++ [class.friend]p1: A friend of a class is a function or 5694 // class that is not a member of the class . . . 5695 // C++0x changes this for both friend types and functions. 5696 // Most C++ 98 compilers do seem to give an error here, so 5697 // we do, too. 5698 if (!Previous.empty() && DC->Equals(CurContext) 5699 && !getLangOptions().CPlusPlus0x) 5700 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5701 } 5702 5703 if (DC->isFileContext()) { 5704 // This implies that it has to be an operator or function. 5705 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5706 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5707 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5708 Diag(Loc, diag::err_introducing_special_friend) << 5709 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5710 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5711 return DeclPtrTy(); 5712 } 5713 } 5714 5715 bool Redeclaration = false; 5716 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5717 move(TemplateParams), 5718 IsDefinition, 5719 Redeclaration); 5720 if (!ND) return DeclPtrTy(); 5721 5722 assert(ND->getDeclContext() == DC); 5723 assert(ND->getLexicalDeclContext() == CurContext); 5724 5725 // Add the function declaration to the appropriate lookup tables, 5726 // adjusting the redeclarations list as necessary. We don't 5727 // want to do this yet if the friending class is dependent. 5728 // 5729 // Also update the scope-based lookup if the target context's 5730 // lookup context is in lexical scope. 5731 if (!CurContext->isDependentContext()) { 5732 DC = DC->getLookupContext(); 5733 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5734 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5735 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5736 } 5737 5738 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5739 D.getIdentifierLoc(), ND, 5740 DS.getFriendSpecLoc()); 5741 FrD->setAccess(AS_public); 5742 CurContext->addDecl(FrD); 5743 5744 return DeclPtrTy::make(ND); 5745} 5746 5747void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5748 AdjustDeclIfTemplate(dcl); 5749 5750 Decl *Dcl = dcl.getAs<Decl>(); 5751 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5752 if (!Fn) { 5753 Diag(DelLoc, diag::err_deleted_non_function); 5754 return; 5755 } 5756 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5757 Diag(DelLoc, diag::err_deleted_decl_not_first); 5758 Diag(Prev->getLocation(), diag::note_previous_declaration); 5759 // If the declaration wasn't the first, we delete the function anyway for 5760 // recovery. 5761 } 5762 Fn->setDeleted(); 5763} 5764 5765static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5766 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5767 ++CI) { 5768 Stmt *SubStmt = *CI; 5769 if (!SubStmt) 5770 continue; 5771 if (isa<ReturnStmt>(SubStmt)) 5772 Self.Diag(SubStmt->getSourceRange().getBegin(), 5773 diag::err_return_in_constructor_handler); 5774 if (!isa<Expr>(SubStmt)) 5775 SearchForReturnInStmt(Self, SubStmt); 5776 } 5777} 5778 5779void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5780 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5781 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5782 SearchForReturnInStmt(*this, Handler); 5783 } 5784} 5785 5786bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5787 const CXXMethodDecl *Old) { 5788 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5789 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5790 5791 if (Context.hasSameType(NewTy, OldTy) || 5792 NewTy->isDependentType() || OldTy->isDependentType()) 5793 return false; 5794 5795 // Check if the return types are covariant 5796 QualType NewClassTy, OldClassTy; 5797 5798 /// Both types must be pointers or references to classes. 5799 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5800 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5801 NewClassTy = NewPT->getPointeeType(); 5802 OldClassTy = OldPT->getPointeeType(); 5803 } 5804 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5805 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5806 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5807 NewClassTy = NewRT->getPointeeType(); 5808 OldClassTy = OldRT->getPointeeType(); 5809 } 5810 } 5811 } 5812 5813 // The return types aren't either both pointers or references to a class type. 5814 if (NewClassTy.isNull()) { 5815 Diag(New->getLocation(), 5816 diag::err_different_return_type_for_overriding_virtual_function) 5817 << New->getDeclName() << NewTy << OldTy; 5818 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5819 5820 return true; 5821 } 5822 5823 // C++ [class.virtual]p6: 5824 // If the return type of D::f differs from the return type of B::f, the 5825 // class type in the return type of D::f shall be complete at the point of 5826 // declaration of D::f or shall be the class type D. 5827 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5828 if (!RT->isBeingDefined() && 5829 RequireCompleteType(New->getLocation(), NewClassTy, 5830 PDiag(diag::err_covariant_return_incomplete) 5831 << New->getDeclName())) 5832 return true; 5833 } 5834 5835 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5836 // Check if the new class derives from the old class. 5837 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5838 Diag(New->getLocation(), 5839 diag::err_covariant_return_not_derived) 5840 << New->getDeclName() << NewTy << OldTy; 5841 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5842 return true; 5843 } 5844 5845 // Check if we the conversion from derived to base is valid. 5846 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5847 diag::err_covariant_return_inaccessible_base, 5848 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5849 // FIXME: Should this point to the return type? 5850 New->getLocation(), SourceRange(), New->getDeclName())) { 5851 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5852 return true; 5853 } 5854 } 5855 5856 // The qualifiers of the return types must be the same. 5857 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5858 Diag(New->getLocation(), 5859 diag::err_covariant_return_type_different_qualifications) 5860 << New->getDeclName() << NewTy << OldTy; 5861 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5862 return true; 5863 }; 5864 5865 5866 // The new class type must have the same or less qualifiers as the old type. 5867 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5868 Diag(New->getLocation(), 5869 diag::err_covariant_return_type_class_type_more_qualified) 5870 << New->getDeclName() << NewTy << OldTy; 5871 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5872 return true; 5873 }; 5874 5875 return false; 5876} 5877 5878bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5879 const CXXMethodDecl *Old) 5880{ 5881 if (Old->hasAttr<FinalAttr>()) { 5882 Diag(New->getLocation(), diag::err_final_function_overridden) 5883 << New->getDeclName(); 5884 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5885 return true; 5886 } 5887 5888 return false; 5889} 5890 5891/// \brief Mark the given method pure. 5892/// 5893/// \param Method the method to be marked pure. 5894/// 5895/// \param InitRange the source range that covers the "0" initializer. 5896bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5897 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5898 Method->setPure(); 5899 5900 // A class is abstract if at least one function is pure virtual. 5901 Method->getParent()->setAbstract(true); 5902 return false; 5903 } 5904 5905 if (!Method->isInvalidDecl()) 5906 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5907 << Method->getDeclName() << InitRange; 5908 return true; 5909} 5910 5911/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5912/// an initializer for the out-of-line declaration 'Dcl'. The scope 5913/// is a fresh scope pushed for just this purpose. 5914/// 5915/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5916/// static data member of class X, names should be looked up in the scope of 5917/// class X. 5918void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5919 // If there is no declaration, there was an error parsing it. 5920 Decl *D = Dcl.getAs<Decl>(); 5921 if (D == 0) return; 5922 5923 // We should only get called for declarations with scope specifiers, like: 5924 // int foo::bar; 5925 assert(D->isOutOfLine()); 5926 EnterDeclaratorContext(S, D->getDeclContext()); 5927} 5928 5929/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5930/// initializer for the out-of-line declaration 'Dcl'. 5931void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5932 // If there is no declaration, there was an error parsing it. 5933 Decl *D = Dcl.getAs<Decl>(); 5934 if (D == 0) return; 5935 5936 assert(D->isOutOfLine()); 5937 ExitDeclaratorContext(S); 5938} 5939 5940/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5941/// C++ if/switch/while/for statement. 5942/// e.g: "if (int x = f()) {...}" 5943Action::DeclResult 5944Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5945 // C++ 6.4p2: 5946 // The declarator shall not specify a function or an array. 5947 // The type-specifier-seq shall not contain typedef and shall not declare a 5948 // new class or enumeration. 5949 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5950 "Parser allowed 'typedef' as storage class of condition decl."); 5951 5952 TypeSourceInfo *TInfo = 0; 5953 TagDecl *OwnedTag = 0; 5954 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5955 5956 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5957 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5958 // would be created and CXXConditionDeclExpr wants a VarDecl. 5959 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5960 << D.getSourceRange(); 5961 return DeclResult(); 5962 } else if (OwnedTag && OwnedTag->isDefinition()) { 5963 // The type-specifier-seq shall not declare a new class or enumeration. 5964 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5965 } 5966 5967 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5968 if (!Dcl) 5969 return DeclResult(); 5970 5971 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5972 VD->setDeclaredInCondition(true); 5973 return Dcl; 5974} 5975 5976static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5977 // Ignore dependent types. 5978 if (MD->isDependentContext()) 5979 return false; 5980 5981 // Ignore declarations that are not definitions. 5982 if (!MD->isThisDeclarationADefinition()) 5983 return false; 5984 5985 CXXRecordDecl *RD = MD->getParent(); 5986 5987 // Ignore classes without a vtable. 5988 if (!RD->isDynamicClass()) 5989 return false; 5990 5991 switch (MD->getParent()->getTemplateSpecializationKind()) { 5992 case TSK_Undeclared: 5993 case TSK_ExplicitSpecialization: 5994 // Classes that aren't instantiations of templates don't need their 5995 // virtual methods marked until we see the definition of the key 5996 // function. 5997 break; 5998 5999 case TSK_ImplicitInstantiation: 6000 // This is a constructor of a class template; mark all of the virtual 6001 // members as referenced to ensure that they get instantiatied. 6002 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 6003 return true; 6004 break; 6005 6006 case TSK_ExplicitInstantiationDeclaration: 6007 return false; 6008 6009 case TSK_ExplicitInstantiationDefinition: 6010 // This is method of a explicit instantiation; mark all of the virtual 6011 // members as referenced to ensure that they get instantiatied. 6012 return true; 6013 } 6014 6015 // Consider only out-of-line definitions of member functions. When we see 6016 // an inline definition, it's too early to compute the key function. 6017 if (!MD->isOutOfLine()) 6018 return false; 6019 6020 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 6021 6022 // If there is no key function, we will need a copy of the vtable. 6023 if (!KeyFunction) 6024 return true; 6025 6026 // If this is the key function, we need to mark virtual members. 6027 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 6028 return true; 6029 6030 return false; 6031} 6032 6033void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 6034 CXXMethodDecl *MD) { 6035 CXXRecordDecl *RD = MD->getParent(); 6036 6037 // We will need to mark all of the virtual members as referenced to build the 6038 // vtable. 6039 if (!needsVtable(MD, Context)) 6040 return; 6041 6042 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 6043 if (kind == TSK_ImplicitInstantiation) 6044 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 6045 else 6046 MarkVirtualMembersReferenced(Loc, RD); 6047} 6048 6049bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 6050 if (ClassesWithUnmarkedVirtualMembers.empty()) 6051 return false; 6052 6053 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 6054 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 6055 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 6056 ClassesWithUnmarkedVirtualMembers.pop_back(); 6057 MarkVirtualMembersReferenced(Loc, RD); 6058 } 6059 6060 return true; 6061} 6062 6063void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6064 const CXXRecordDecl *RD) { 6065 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6066 e = RD->method_end(); i != e; ++i) { 6067 CXXMethodDecl *MD = *i; 6068 6069 // C++ [basic.def.odr]p2: 6070 // [...] A virtual member function is used if it is not pure. [...] 6071 if (MD->isVirtual() && !MD->isPure()) 6072 MarkDeclarationReferenced(Loc, MD); 6073 } 6074 6075 // Only classes that have virtual bases need a VTT. 6076 if (RD->getNumVBases() == 0) 6077 return; 6078 6079 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6080 e = RD->bases_end(); i != e; ++i) { 6081 const CXXRecordDecl *Base = 6082 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6083 if (i->isVirtual()) 6084 continue; 6085 if (Base->getNumVBases() == 0) 6086 continue; 6087 MarkVirtualMembersReferenced(Loc, Base); 6088 } 6089} 6090