SemaDeclCXX.cpp revision 32f2fb53d9d7c28c94d8569fd0fcf06cccee0c3d
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 const CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1080 bool NotUnknownSpecialization = false; 1081 DeclContext *DC = computeDeclContext(SS, false); 1082 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1083 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1084 1085 if (!NotUnknownSpecialization) { 1086 // When the scope specifier can refer to a member of an unknown 1087 // specialization, we take it as a type name. 1088 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1089 *MemberOrBase, SS.getRange()); 1090 if (BaseType.isNull()) 1091 return true; 1092 1093 R.clear(); 1094 } 1095 } 1096 1097 // If no results were found, try to correct typos. 1098 if (R.empty() && BaseType.isNull() && 1099 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1100 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1101 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1102 // We have found a non-static data member with a similar 1103 // name to what was typed; complain and initialize that 1104 // member. 1105 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1106 << MemberOrBase << true << R.getLookupName() 1107 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1108 R.getLookupName().getAsString()); 1109 Diag(Member->getLocation(), diag::note_previous_decl) 1110 << Member->getDeclName(); 1111 1112 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1113 LParenLoc, RParenLoc); 1114 } 1115 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1116 const CXXBaseSpecifier *DirectBaseSpec; 1117 const CXXBaseSpecifier *VirtualBaseSpec; 1118 if (FindBaseInitializer(*this, ClassDecl, 1119 Context.getTypeDeclType(Type), 1120 DirectBaseSpec, VirtualBaseSpec)) { 1121 // We have found a direct or virtual base class with a 1122 // similar name to what was typed; complain and initialize 1123 // that base class. 1124 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1125 << MemberOrBase << false << R.getLookupName() 1126 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1127 R.getLookupName().getAsString()); 1128 1129 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1130 : VirtualBaseSpec; 1131 Diag(BaseSpec->getSourceRange().getBegin(), 1132 diag::note_base_class_specified_here) 1133 << BaseSpec->getType() 1134 << BaseSpec->getSourceRange(); 1135 1136 TyD = Type; 1137 } 1138 } 1139 } 1140 1141 if (!TyD && BaseType.isNull()) { 1142 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1143 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1144 return true; 1145 } 1146 } 1147 1148 if (BaseType.isNull()) { 1149 BaseType = Context.getTypeDeclType(TyD); 1150 if (SS.isSet()) { 1151 NestedNameSpecifier *Qualifier = 1152 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1153 1154 // FIXME: preserve source range information 1155 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1156 } 1157 } 1158 } 1159 1160 if (!TInfo) 1161 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1162 1163 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1164 LParenLoc, RParenLoc, ClassDecl); 1165} 1166 1167/// Checks an initializer expression for use of uninitialized fields, such as 1168/// containing the field that is being initialized. Returns true if there is an 1169/// uninitialized field was used an updates the SourceLocation parameter; false 1170/// otherwise. 1171static bool InitExprContainsUninitializedFields(const Stmt* S, 1172 const FieldDecl* LhsField, 1173 SourceLocation* L) { 1174 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1175 if (ME) { 1176 const NamedDecl* RhsField = ME->getMemberDecl(); 1177 if (RhsField == LhsField) { 1178 // Initializing a field with itself. Throw a warning. 1179 // But wait; there are exceptions! 1180 // Exception #1: The field may not belong to this record. 1181 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1182 const Expr* base = ME->getBase(); 1183 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1184 // Even though the field matches, it does not belong to this record. 1185 return false; 1186 } 1187 // None of the exceptions triggered; return true to indicate an 1188 // uninitialized field was used. 1189 *L = ME->getMemberLoc(); 1190 return true; 1191 } 1192 } 1193 bool found = false; 1194 for (Stmt::const_child_iterator it = S->child_begin(); 1195 it != S->child_end() && found == false; 1196 ++it) { 1197 if (isa<CallExpr>(S)) { 1198 // Do not descend into function calls or constructors, as the use 1199 // of an uninitialized field may be valid. One would have to inspect 1200 // the contents of the function/ctor to determine if it is safe or not. 1201 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1202 // may be safe, depending on what the function/ctor does. 1203 continue; 1204 } 1205 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1206 } 1207 return found; 1208} 1209 1210Sema::MemInitResult 1211Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1212 unsigned NumArgs, SourceLocation IdLoc, 1213 SourceLocation LParenLoc, 1214 SourceLocation RParenLoc) { 1215 // Diagnose value-uses of fields to initialize themselves, e.g. 1216 // foo(foo) 1217 // where foo is not also a parameter to the constructor. 1218 // TODO: implement -Wuninitialized and fold this into that framework. 1219 for (unsigned i = 0; i < NumArgs; ++i) { 1220 SourceLocation L; 1221 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1222 // FIXME: Return true in the case when other fields are used before being 1223 // uninitialized. For example, let this field be the i'th field. When 1224 // initializing the i'th field, throw a warning if any of the >= i'th 1225 // fields are used, as they are not yet initialized. 1226 // Right now we are only handling the case where the i'th field uses 1227 // itself in its initializer. 1228 Diag(L, diag::warn_field_is_uninit); 1229 } 1230 } 1231 1232 bool HasDependentArg = false; 1233 for (unsigned i = 0; i < NumArgs; i++) 1234 HasDependentArg |= Args[i]->isTypeDependent(); 1235 1236 QualType FieldType = Member->getType(); 1237 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1238 FieldType = Array->getElementType(); 1239 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1240 if (FieldType->isDependentType() || HasDependentArg) { 1241 // Can't check initialization for a member of dependent type or when 1242 // any of the arguments are type-dependent expressions. 1243 OwningExprResult Init 1244 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1245 RParenLoc)); 1246 1247 // Erase any temporaries within this evaluation context; we're not 1248 // going to track them in the AST, since we'll be rebuilding the 1249 // ASTs during template instantiation. 1250 ExprTemporaries.erase( 1251 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1252 ExprTemporaries.end()); 1253 1254 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1255 LParenLoc, 1256 Init.takeAs<Expr>(), 1257 RParenLoc); 1258 1259 } 1260 1261 if (Member->isInvalidDecl()) 1262 return true; 1263 1264 // Initialize the member. 1265 InitializedEntity MemberEntity = 1266 InitializedEntity::InitializeMember(Member, 0); 1267 InitializationKind Kind = 1268 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1269 1270 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1271 1272 OwningExprResult MemberInit = 1273 InitSeq.Perform(*this, MemberEntity, Kind, 1274 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1275 if (MemberInit.isInvalid()) 1276 return true; 1277 1278 // C++0x [class.base.init]p7: 1279 // The initialization of each base and member constitutes a 1280 // full-expression. 1281 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1282 if (MemberInit.isInvalid()) 1283 return true; 1284 1285 // If we are in a dependent context, template instantiation will 1286 // perform this type-checking again. Just save the arguments that we 1287 // received in a ParenListExpr. 1288 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1289 // of the information that we have about the member 1290 // initializer. However, deconstructing the ASTs is a dicey process, 1291 // and this approach is far more likely to get the corner cases right. 1292 if (CurContext->isDependentContext()) { 1293 // Bump the reference count of all of the arguments. 1294 for (unsigned I = 0; I != NumArgs; ++I) 1295 Args[I]->Retain(); 1296 1297 OwningExprResult Init 1298 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1299 RParenLoc)); 1300 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1301 LParenLoc, 1302 Init.takeAs<Expr>(), 1303 RParenLoc); 1304 } 1305 1306 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1307 LParenLoc, 1308 MemberInit.takeAs<Expr>(), 1309 RParenLoc); 1310} 1311 1312Sema::MemInitResult 1313Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1314 Expr **Args, unsigned NumArgs, 1315 SourceLocation LParenLoc, SourceLocation RParenLoc, 1316 CXXRecordDecl *ClassDecl) { 1317 bool HasDependentArg = false; 1318 for (unsigned i = 0; i < NumArgs; i++) 1319 HasDependentArg |= Args[i]->isTypeDependent(); 1320 1321 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1322 if (BaseType->isDependentType() || HasDependentArg) { 1323 // Can't check initialization for a base of dependent type or when 1324 // any of the arguments are type-dependent expressions. 1325 OwningExprResult BaseInit 1326 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1327 RParenLoc)); 1328 1329 // Erase any temporaries within this evaluation context; we're not 1330 // going to track them in the AST, since we'll be rebuilding the 1331 // ASTs during template instantiation. 1332 ExprTemporaries.erase( 1333 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1334 ExprTemporaries.end()); 1335 1336 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1337 LParenLoc, 1338 BaseInit.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 if (!BaseType->isRecordType()) 1343 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1344 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1345 1346 // C++ [class.base.init]p2: 1347 // [...] Unless the mem-initializer-id names a nonstatic data 1348 // member of the constructor’s class or a direct or virtual base 1349 // of that class, the mem-initializer is ill-formed. A 1350 // mem-initializer-list can initialize a base class using any 1351 // name that denotes that base class type. 1352 1353 // Check for direct and virtual base classes. 1354 const CXXBaseSpecifier *DirectBaseSpec = 0; 1355 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1356 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1357 VirtualBaseSpec); 1358 1359 // C++ [base.class.init]p2: 1360 // If a mem-initializer-id is ambiguous because it designates both 1361 // a direct non-virtual base class and an inherited virtual base 1362 // class, the mem-initializer is ill-formed. 1363 if (DirectBaseSpec && VirtualBaseSpec) 1364 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1365 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1366 // C++ [base.class.init]p2: 1367 // Unless the mem-initializer-id names a nonstatic data membeer of the 1368 // constructor's class ot a direst or virtual base of that class, the 1369 // mem-initializer is ill-formed. 1370 if (!DirectBaseSpec && !VirtualBaseSpec) 1371 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1372 << BaseType << ClassDecl->getNameAsCString() 1373 << BaseTInfo->getTypeLoc().getSourceRange(); 1374 1375 CXXBaseSpecifier *BaseSpec 1376 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1377 if (!BaseSpec) 1378 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1379 1380 // Initialize the base. 1381 InitializedEntity BaseEntity = 1382 InitializedEntity::InitializeBase(Context, BaseSpec); 1383 InitializationKind Kind = 1384 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1385 1386 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1387 1388 OwningExprResult BaseInit = 1389 InitSeq.Perform(*this, BaseEntity, Kind, 1390 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1391 if (BaseInit.isInvalid()) 1392 return true; 1393 1394 // C++0x [class.base.init]p7: 1395 // The initialization of each base and member constitutes a 1396 // full-expression. 1397 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1398 if (BaseInit.isInvalid()) 1399 return true; 1400 1401 // If we are in a dependent context, template instantiation will 1402 // perform this type-checking again. Just save the arguments that we 1403 // received in a ParenListExpr. 1404 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1405 // of the information that we have about the base 1406 // initializer. However, deconstructing the ASTs is a dicey process, 1407 // and this approach is far more likely to get the corner cases right. 1408 if (CurContext->isDependentContext()) { 1409 // Bump the reference count of all of the arguments. 1410 for (unsigned I = 0; I != NumArgs; ++I) 1411 Args[I]->Retain(); 1412 1413 OwningExprResult Init 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1417 LParenLoc, 1418 Init.takeAs<Expr>(), 1419 RParenLoc); 1420 } 1421 1422 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1423 LParenLoc, 1424 BaseInit.takeAs<Expr>(), 1425 RParenLoc); 1426} 1427 1428bool 1429Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1430 CXXBaseOrMemberInitializer **Initializers, 1431 unsigned NumInitializers, 1432 bool IsImplicitConstructor, 1433 bool AnyErrors) { 1434 // We need to build the initializer AST according to order of construction 1435 // and not what user specified in the Initializers list. 1436 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1437 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1438 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1439 bool HasDependentBaseInit = false; 1440 bool HadError = false; 1441 1442 for (unsigned i = 0; i < NumInitializers; i++) { 1443 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1444 if (Member->isBaseInitializer()) { 1445 if (Member->getBaseClass()->isDependentType()) 1446 HasDependentBaseInit = true; 1447 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1448 } else { 1449 AllBaseFields[Member->getMember()] = Member; 1450 } 1451 } 1452 1453 if (HasDependentBaseInit) { 1454 // FIXME. This does not preserve the ordering of the initializers. 1455 // Try (with -Wreorder) 1456 // template<class X> struct A {}; 1457 // template<class X> struct B : A<X> { 1458 // B() : x1(10), A<X>() {} 1459 // int x1; 1460 // }; 1461 // B<int> x; 1462 // On seeing one dependent type, we should essentially exit this routine 1463 // while preserving user-declared initializer list. When this routine is 1464 // called during instantiatiation process, this routine will rebuild the 1465 // ordered initializer list correctly. 1466 1467 // If we have a dependent base initialization, we can't determine the 1468 // association between initializers and bases; just dump the known 1469 // initializers into the list, and don't try to deal with other bases. 1470 for (unsigned i = 0; i < NumInitializers; i++) { 1471 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1472 if (Member->isBaseInitializer()) 1473 AllToInit.push_back(Member); 1474 } 1475 } else { 1476 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1477 1478 // Push virtual bases before others. 1479 for (CXXRecordDecl::base_class_iterator VBase = 1480 ClassDecl->vbases_begin(), 1481 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1482 if (VBase->getType()->isDependentType()) 1483 continue; 1484 if (CXXBaseOrMemberInitializer *Value 1485 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1486 AllToInit.push_back(Value); 1487 } else if (!AnyErrors) { 1488 InitializedEntity InitEntity 1489 = InitializedEntity::InitializeBase(Context, VBase); 1490 InitializationKind InitKind 1491 = InitializationKind::CreateDefault(Constructor->getLocation()); 1492 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1493 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1494 MultiExprArg(*this, 0, 0)); 1495 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1496 if (BaseInit.isInvalid()) { 1497 HadError = true; 1498 continue; 1499 } 1500 1501 // Don't attach synthesized base initializers in a dependent 1502 // context; they'll be checked again at template instantiation 1503 // time. 1504 if (CurContext->isDependentContext()) 1505 continue; 1506 1507 CXXBaseOrMemberInitializer *CXXBaseInit = 1508 new (Context) CXXBaseOrMemberInitializer(Context, 1509 Context.getTrivialTypeSourceInfo(VBase->getType(), 1510 SourceLocation()), 1511 SourceLocation(), 1512 BaseInit.takeAs<Expr>(), 1513 SourceLocation()); 1514 AllToInit.push_back(CXXBaseInit); 1515 } 1516 } 1517 1518 for (CXXRecordDecl::base_class_iterator Base = 1519 ClassDecl->bases_begin(), 1520 E = ClassDecl->bases_end(); Base != E; ++Base) { 1521 // Virtuals are in the virtual base list and already constructed. 1522 if (Base->isVirtual()) 1523 continue; 1524 // Skip dependent types. 1525 if (Base->getType()->isDependentType()) 1526 continue; 1527 if (CXXBaseOrMemberInitializer *Value 1528 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1529 AllToInit.push_back(Value); 1530 } 1531 else if (!AnyErrors) { 1532 InitializedEntity InitEntity 1533 = InitializedEntity::InitializeBase(Context, Base); 1534 InitializationKind InitKind 1535 = InitializationKind::CreateDefault(Constructor->getLocation()); 1536 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1537 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1538 MultiExprArg(*this, 0, 0)); 1539 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1540 if (BaseInit.isInvalid()) { 1541 HadError = true; 1542 continue; 1543 } 1544 1545 // Don't attach synthesized base initializers in a dependent 1546 // context; they'll be regenerated at template instantiation 1547 // time. 1548 if (CurContext->isDependentContext()) 1549 continue; 1550 1551 CXXBaseOrMemberInitializer *CXXBaseInit = 1552 new (Context) CXXBaseOrMemberInitializer(Context, 1553 Context.getTrivialTypeSourceInfo(Base->getType(), 1554 SourceLocation()), 1555 SourceLocation(), 1556 BaseInit.takeAs<Expr>(), 1557 SourceLocation()); 1558 AllToInit.push_back(CXXBaseInit); 1559 } 1560 } 1561 } 1562 1563 // non-static data members. 1564 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1565 E = ClassDecl->field_end(); Field != E; ++Field) { 1566 if ((*Field)->isAnonymousStructOrUnion()) { 1567 if (const RecordType *FieldClassType = 1568 Field->getType()->getAs<RecordType>()) { 1569 CXXRecordDecl *FieldClassDecl 1570 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1571 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1572 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1573 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1574 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1575 // set to the anonymous union data member used in the initializer 1576 // list. 1577 Value->setMember(*Field); 1578 Value->setAnonUnionMember(*FA); 1579 AllToInit.push_back(Value); 1580 break; 1581 } 1582 } 1583 } 1584 continue; 1585 } 1586 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1587 AllToInit.push_back(Value); 1588 continue; 1589 } 1590 1591 if ((*Field)->getType()->isDependentType() || AnyErrors) 1592 continue; 1593 1594 QualType FT = Context.getBaseElementType((*Field)->getType()); 1595 if (FT->getAs<RecordType>()) { 1596 InitializedEntity InitEntity 1597 = InitializedEntity::InitializeMember(*Field); 1598 InitializationKind InitKind 1599 = InitializationKind::CreateDefault(Constructor->getLocation()); 1600 1601 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1602 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1603 MultiExprArg(*this, 0, 0)); 1604 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1605 if (MemberInit.isInvalid()) { 1606 HadError = true; 1607 continue; 1608 } 1609 1610 // Don't attach synthesized member initializers in a dependent 1611 // context; they'll be regenerated a template instantiation 1612 // time. 1613 if (CurContext->isDependentContext()) 1614 continue; 1615 1616 CXXBaseOrMemberInitializer *Member = 1617 new (Context) CXXBaseOrMemberInitializer(Context, 1618 *Field, SourceLocation(), 1619 SourceLocation(), 1620 MemberInit.takeAs<Expr>(), 1621 SourceLocation()); 1622 1623 AllToInit.push_back(Member); 1624 } 1625 else if (FT->isReferenceType()) { 1626 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1627 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1628 << 0 << (*Field)->getDeclName(); 1629 Diag((*Field)->getLocation(), diag::note_declared_at); 1630 HadError = true; 1631 } 1632 else if (FT.isConstQualified()) { 1633 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1634 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1635 << 1 << (*Field)->getDeclName(); 1636 Diag((*Field)->getLocation(), diag::note_declared_at); 1637 HadError = true; 1638 } 1639 } 1640 1641 NumInitializers = AllToInit.size(); 1642 if (NumInitializers > 0) { 1643 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1644 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1645 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1646 memcpy(baseOrMemberInitializers, AllToInit.data(), 1647 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1648 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1649 1650 // Constructors implicitly reference the base and member 1651 // destructors. 1652 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1653 Constructor->getParent()); 1654 } 1655 1656 return HadError; 1657} 1658 1659static void *GetKeyForTopLevelField(FieldDecl *Field) { 1660 // For anonymous unions, use the class declaration as the key. 1661 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1662 if (RT->getDecl()->isAnonymousStructOrUnion()) 1663 return static_cast<void *>(RT->getDecl()); 1664 } 1665 return static_cast<void *>(Field); 1666} 1667 1668static void *GetKeyForBase(QualType BaseType) { 1669 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1670 return (void *)RT; 1671 1672 assert(0 && "Unexpected base type!"); 1673 return 0; 1674} 1675 1676static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1677 bool MemberMaybeAnon = false) { 1678 // For fields injected into the class via declaration of an anonymous union, 1679 // use its anonymous union class declaration as the unique key. 1680 if (Member->isMemberInitializer()) { 1681 FieldDecl *Field = Member->getMember(); 1682 1683 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1684 // data member of the class. Data member used in the initializer list is 1685 // in AnonUnionMember field. 1686 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1687 Field = Member->getAnonUnionMember(); 1688 if (Field->getDeclContext()->isRecord()) { 1689 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1690 if (RD->isAnonymousStructOrUnion()) 1691 return static_cast<void *>(RD); 1692 } 1693 return static_cast<void *>(Field); 1694 } 1695 1696 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1697} 1698 1699/// ActOnMemInitializers - Handle the member initializers for a constructor. 1700void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1701 SourceLocation ColonLoc, 1702 MemInitTy **MemInits, unsigned NumMemInits, 1703 bool AnyErrors) { 1704 if (!ConstructorDecl) 1705 return; 1706 1707 AdjustDeclIfTemplate(ConstructorDecl); 1708 1709 CXXConstructorDecl *Constructor 1710 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1711 1712 if (!Constructor) { 1713 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1714 return; 1715 } 1716 1717 if (!Constructor->isDependentContext()) { 1718 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1719 bool err = false; 1720 for (unsigned i = 0; i < NumMemInits; i++) { 1721 CXXBaseOrMemberInitializer *Member = 1722 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1723 void *KeyToMember = GetKeyForMember(Member); 1724 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1725 if (!PrevMember) { 1726 PrevMember = Member; 1727 continue; 1728 } 1729 if (FieldDecl *Field = Member->getMember()) 1730 Diag(Member->getSourceLocation(), 1731 diag::error_multiple_mem_initialization) 1732 << Field->getNameAsString() 1733 << Member->getSourceRange(); 1734 else { 1735 Type *BaseClass = Member->getBaseClass(); 1736 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1737 Diag(Member->getSourceLocation(), 1738 diag::error_multiple_base_initialization) 1739 << QualType(BaseClass, 0) 1740 << Member->getSourceRange(); 1741 } 1742 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1743 << 0; 1744 err = true; 1745 } 1746 1747 if (err) 1748 return; 1749 } 1750 1751 SetBaseOrMemberInitializers(Constructor, 1752 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1753 NumMemInits, false, AnyErrors); 1754 1755 if (Constructor->isDependentContext()) 1756 return; 1757 1758 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1759 Diagnostic::Ignored && 1760 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1761 Diagnostic::Ignored) 1762 return; 1763 1764 // Also issue warning if order of ctor-initializer list does not match order 1765 // of 1) base class declarations and 2) order of non-static data members. 1766 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1767 1768 CXXRecordDecl *ClassDecl 1769 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1770 // Push virtual bases before others. 1771 for (CXXRecordDecl::base_class_iterator VBase = 1772 ClassDecl->vbases_begin(), 1773 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1774 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1775 1776 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1777 E = ClassDecl->bases_end(); Base != E; ++Base) { 1778 // Virtuals are alread in the virtual base list and are constructed 1779 // first. 1780 if (Base->isVirtual()) 1781 continue; 1782 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1783 } 1784 1785 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1786 E = ClassDecl->field_end(); Field != E; ++Field) 1787 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1788 1789 int Last = AllBaseOrMembers.size(); 1790 int curIndex = 0; 1791 CXXBaseOrMemberInitializer *PrevMember = 0; 1792 for (unsigned i = 0; i < NumMemInits; i++) { 1793 CXXBaseOrMemberInitializer *Member = 1794 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1795 void *MemberInCtorList = GetKeyForMember(Member, true); 1796 1797 for (; curIndex < Last; curIndex++) 1798 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1799 break; 1800 if (curIndex == Last) { 1801 assert(PrevMember && "Member not in member list?!"); 1802 // Initializer as specified in ctor-initializer list is out of order. 1803 // Issue a warning diagnostic. 1804 if (PrevMember->isBaseInitializer()) { 1805 // Diagnostics is for an initialized base class. 1806 Type *BaseClass = PrevMember->getBaseClass(); 1807 Diag(PrevMember->getSourceLocation(), 1808 diag::warn_base_initialized) 1809 << QualType(BaseClass, 0); 1810 } else { 1811 FieldDecl *Field = PrevMember->getMember(); 1812 Diag(PrevMember->getSourceLocation(), 1813 diag::warn_field_initialized) 1814 << Field->getNameAsString(); 1815 } 1816 // Also the note! 1817 if (FieldDecl *Field = Member->getMember()) 1818 Diag(Member->getSourceLocation(), 1819 diag::note_fieldorbase_initialized_here) << 0 1820 << Field->getNameAsString(); 1821 else { 1822 Type *BaseClass = Member->getBaseClass(); 1823 Diag(Member->getSourceLocation(), 1824 diag::note_fieldorbase_initialized_here) << 1 1825 << QualType(BaseClass, 0); 1826 } 1827 for (curIndex = 0; curIndex < Last; curIndex++) 1828 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1829 break; 1830 } 1831 PrevMember = Member; 1832 } 1833} 1834 1835void 1836Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1837 CXXRecordDecl *ClassDecl) { 1838 // Ignore dependent contexts. 1839 if (ClassDecl->isDependentContext()) 1840 return; 1841 1842 // FIXME: all the access-control diagnostics are positioned on the 1843 // field/base declaration. That's probably good; that said, the 1844 // user might reasonably want to know why the destructor is being 1845 // emitted, and we currently don't say. 1846 1847 // Non-static data members. 1848 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1849 E = ClassDecl->field_end(); I != E; ++I) { 1850 FieldDecl *Field = *I; 1851 1852 QualType FieldType = Context.getBaseElementType(Field->getType()); 1853 1854 const RecordType* RT = FieldType->getAs<RecordType>(); 1855 if (!RT) 1856 continue; 1857 1858 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1859 if (FieldClassDecl->hasTrivialDestructor()) 1860 continue; 1861 1862 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1863 CheckDestructorAccess(Field->getLocation(), Dtor, 1864 PartialDiagnostic(diag::err_access_dtor_field) 1865 << Field->getDeclName() 1866 << FieldType); 1867 1868 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1869 } 1870 1871 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1872 1873 // Bases. 1874 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1875 E = ClassDecl->bases_end(); Base != E; ++Base) { 1876 // Bases are always records in a well-formed non-dependent class. 1877 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1878 1879 // Remember direct virtual bases. 1880 if (Base->isVirtual()) 1881 DirectVirtualBases.insert(RT); 1882 1883 // Ignore trivial destructors. 1884 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1885 if (BaseClassDecl->hasTrivialDestructor()) 1886 continue; 1887 1888 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1889 1890 // FIXME: caret should be on the start of the class name 1891 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1892 PartialDiagnostic(diag::err_access_dtor_base) 1893 << Base->getType() 1894 << Base->getSourceRange()); 1895 1896 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1897 } 1898 1899 // Virtual bases. 1900 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1901 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1902 1903 // Bases are always records in a well-formed non-dependent class. 1904 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1905 1906 // Ignore direct virtual bases. 1907 if (DirectVirtualBases.count(RT)) 1908 continue; 1909 1910 // Ignore trivial destructors. 1911 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1912 if (BaseClassDecl->hasTrivialDestructor()) 1913 continue; 1914 1915 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1916 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1917 PartialDiagnostic(diag::err_access_dtor_vbase) 1918 << VBase->getType()); 1919 1920 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1921 } 1922} 1923 1924void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1925 if (!CDtorDecl) 1926 return; 1927 1928 AdjustDeclIfTemplate(CDtorDecl); 1929 1930 if (CXXConstructorDecl *Constructor 1931 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1932 SetBaseOrMemberInitializers(Constructor, 0, 0, false, false); 1933} 1934 1935bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1936 unsigned DiagID, AbstractDiagSelID SelID, 1937 const CXXRecordDecl *CurrentRD) { 1938 if (SelID == -1) 1939 return RequireNonAbstractType(Loc, T, 1940 PDiag(DiagID), CurrentRD); 1941 else 1942 return RequireNonAbstractType(Loc, T, 1943 PDiag(DiagID) << SelID, CurrentRD); 1944} 1945 1946bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1947 const PartialDiagnostic &PD, 1948 const CXXRecordDecl *CurrentRD) { 1949 if (!getLangOptions().CPlusPlus) 1950 return false; 1951 1952 if (const ArrayType *AT = Context.getAsArrayType(T)) 1953 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1954 CurrentRD); 1955 1956 if (const PointerType *PT = T->getAs<PointerType>()) { 1957 // Find the innermost pointer type. 1958 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1959 PT = T; 1960 1961 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1962 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1963 } 1964 1965 const RecordType *RT = T->getAs<RecordType>(); 1966 if (!RT) 1967 return false; 1968 1969 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1970 1971 if (CurrentRD && CurrentRD != RD) 1972 return false; 1973 1974 // FIXME: is this reasonable? It matches current behavior, but.... 1975 if (!RD->getDefinition()) 1976 return false; 1977 1978 if (!RD->isAbstract()) 1979 return false; 1980 1981 Diag(Loc, PD) << RD->getDeclName(); 1982 1983 // Check if we've already emitted the list of pure virtual functions for this 1984 // class. 1985 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1986 return true; 1987 1988 CXXFinalOverriderMap FinalOverriders; 1989 RD->getFinalOverriders(FinalOverriders); 1990 1991 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 1992 MEnd = FinalOverriders.end(); 1993 M != MEnd; 1994 ++M) { 1995 for (OverridingMethods::iterator SO = M->second.begin(), 1996 SOEnd = M->second.end(); 1997 SO != SOEnd; ++SO) { 1998 // C++ [class.abstract]p4: 1999 // A class is abstract if it contains or inherits at least one 2000 // pure virtual function for which the final overrider is pure 2001 // virtual. 2002 2003 // 2004 if (SO->second.size() != 1) 2005 continue; 2006 2007 if (!SO->second.front().Method->isPure()) 2008 continue; 2009 2010 Diag(SO->second.front().Method->getLocation(), 2011 diag::note_pure_virtual_function) 2012 << SO->second.front().Method->getDeclName(); 2013 } 2014 } 2015 2016 if (!PureVirtualClassDiagSet) 2017 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2018 PureVirtualClassDiagSet->insert(RD); 2019 2020 return true; 2021} 2022 2023namespace { 2024 class AbstractClassUsageDiagnoser 2025 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2026 Sema &SemaRef; 2027 CXXRecordDecl *AbstractClass; 2028 2029 bool VisitDeclContext(const DeclContext *DC) { 2030 bool Invalid = false; 2031 2032 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2033 E = DC->decls_end(); I != E; ++I) 2034 Invalid |= Visit(*I); 2035 2036 return Invalid; 2037 } 2038 2039 public: 2040 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2041 : SemaRef(SemaRef), AbstractClass(ac) { 2042 Visit(SemaRef.Context.getTranslationUnitDecl()); 2043 } 2044 2045 bool VisitFunctionDecl(const FunctionDecl *FD) { 2046 if (FD->isThisDeclarationADefinition()) { 2047 // No need to do the check if we're in a definition, because it requires 2048 // that the return/param types are complete. 2049 // because that requires 2050 return VisitDeclContext(FD); 2051 } 2052 2053 // Check the return type. 2054 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2055 bool Invalid = 2056 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2057 diag::err_abstract_type_in_decl, 2058 Sema::AbstractReturnType, 2059 AbstractClass); 2060 2061 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2062 E = FD->param_end(); I != E; ++I) { 2063 const ParmVarDecl *VD = *I; 2064 Invalid |= 2065 SemaRef.RequireNonAbstractType(VD->getLocation(), 2066 VD->getOriginalType(), 2067 diag::err_abstract_type_in_decl, 2068 Sema::AbstractParamType, 2069 AbstractClass); 2070 } 2071 2072 return Invalid; 2073 } 2074 2075 bool VisitDecl(const Decl* D) { 2076 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2077 return VisitDeclContext(DC); 2078 2079 return false; 2080 } 2081 }; 2082} 2083 2084/// \brief Perform semantic checks on a class definition that has been 2085/// completing, introducing implicitly-declared members, checking for 2086/// abstract types, etc. 2087void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2088 if (!Record || Record->isInvalidDecl()) 2089 return; 2090 2091 if (!Record->isDependentType()) 2092 AddImplicitlyDeclaredMembersToClass(Record); 2093 2094 if (Record->isInvalidDecl()) 2095 return; 2096 2097 // Set access bits correctly on the directly-declared conversions. 2098 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2099 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2100 Convs->setAccess(I, (*I)->getAccess()); 2101 2102 // Determine whether we need to check for final overriders. We do 2103 // this either when there are virtual base classes (in which case we 2104 // may end up finding multiple final overriders for a given virtual 2105 // function) or any of the base classes is abstract (in which case 2106 // we might detect that this class is abstract). 2107 bool CheckFinalOverriders = false; 2108 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2109 !Record->isDependentType()) { 2110 if (Record->getNumVBases()) 2111 CheckFinalOverriders = true; 2112 else if (!Record->isAbstract()) { 2113 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2114 BEnd = Record->bases_end(); 2115 B != BEnd; ++B) { 2116 CXXRecordDecl *BaseDecl 2117 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2118 if (BaseDecl->isAbstract()) { 2119 CheckFinalOverriders = true; 2120 break; 2121 } 2122 } 2123 } 2124 } 2125 2126 if (CheckFinalOverriders) { 2127 CXXFinalOverriderMap FinalOverriders; 2128 Record->getFinalOverriders(FinalOverriders); 2129 2130 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2131 MEnd = FinalOverriders.end(); 2132 M != MEnd; ++M) { 2133 for (OverridingMethods::iterator SO = M->second.begin(), 2134 SOEnd = M->second.end(); 2135 SO != SOEnd; ++SO) { 2136 assert(SO->second.size() > 0 && 2137 "All virtual functions have overridding virtual functions"); 2138 if (SO->second.size() == 1) { 2139 // C++ [class.abstract]p4: 2140 // A class is abstract if it contains or inherits at least one 2141 // pure virtual function for which the final overrider is pure 2142 // virtual. 2143 if (SO->second.front().Method->isPure()) 2144 Record->setAbstract(true); 2145 continue; 2146 } 2147 2148 // C++ [class.virtual]p2: 2149 // In a derived class, if a virtual member function of a base 2150 // class subobject has more than one final overrider the 2151 // program is ill-formed. 2152 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2153 << (NamedDecl *)M->first << Record; 2154 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2155 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2156 OMEnd = SO->second.end(); 2157 OM != OMEnd; ++OM) 2158 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2159 << (NamedDecl *)M->first << OM->Method->getParent(); 2160 2161 Record->setInvalidDecl(); 2162 } 2163 } 2164 } 2165 2166 if (Record->isAbstract() && !Record->isInvalidDecl()) 2167 (void)AbstractClassUsageDiagnoser(*this, Record); 2168} 2169 2170void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2171 DeclPtrTy TagDecl, 2172 SourceLocation LBrac, 2173 SourceLocation RBrac) { 2174 if (!TagDecl) 2175 return; 2176 2177 AdjustDeclIfTemplate(TagDecl); 2178 2179 ActOnFields(S, RLoc, TagDecl, 2180 (DeclPtrTy*)FieldCollector->getCurFields(), 2181 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2182 2183 CheckCompletedCXXClass( 2184 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2185} 2186 2187/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2188/// special functions, such as the default constructor, copy 2189/// constructor, or destructor, to the given C++ class (C++ 2190/// [special]p1). This routine can only be executed just before the 2191/// definition of the class is complete. 2192void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2193 CanQualType ClassType 2194 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2195 2196 // FIXME: Implicit declarations have exception specifications, which are 2197 // the union of the specifications of the implicitly called functions. 2198 2199 if (!ClassDecl->hasUserDeclaredConstructor()) { 2200 // C++ [class.ctor]p5: 2201 // A default constructor for a class X is a constructor of class X 2202 // that can be called without an argument. If there is no 2203 // user-declared constructor for class X, a default constructor is 2204 // implicitly declared. An implicitly-declared default constructor 2205 // is an inline public member of its class. 2206 DeclarationName Name 2207 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2208 CXXConstructorDecl *DefaultCon = 2209 CXXConstructorDecl::Create(Context, ClassDecl, 2210 ClassDecl->getLocation(), Name, 2211 Context.getFunctionType(Context.VoidTy, 2212 0, 0, false, 0, 2213 /*FIXME*/false, false, 2214 0, 0, false, 2215 CC_Default), 2216 /*TInfo=*/0, 2217 /*isExplicit=*/false, 2218 /*isInline=*/true, 2219 /*isImplicitlyDeclared=*/true); 2220 DefaultCon->setAccess(AS_public); 2221 DefaultCon->setImplicit(); 2222 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2223 ClassDecl->addDecl(DefaultCon); 2224 } 2225 2226 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2227 // C++ [class.copy]p4: 2228 // If the class definition does not explicitly declare a copy 2229 // constructor, one is declared implicitly. 2230 2231 // C++ [class.copy]p5: 2232 // The implicitly-declared copy constructor for a class X will 2233 // have the form 2234 // 2235 // X::X(const X&) 2236 // 2237 // if 2238 bool HasConstCopyConstructor = true; 2239 2240 // -- each direct or virtual base class B of X has a copy 2241 // constructor whose first parameter is of type const B& or 2242 // const volatile B&, and 2243 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2244 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2245 const CXXRecordDecl *BaseClassDecl 2246 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2247 HasConstCopyConstructor 2248 = BaseClassDecl->hasConstCopyConstructor(Context); 2249 } 2250 2251 // -- for all the nonstatic data members of X that are of a 2252 // class type M (or array thereof), each such class type 2253 // has a copy constructor whose first parameter is of type 2254 // const M& or const volatile M&. 2255 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2256 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2257 ++Field) { 2258 QualType FieldType = (*Field)->getType(); 2259 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2260 FieldType = Array->getElementType(); 2261 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2262 const CXXRecordDecl *FieldClassDecl 2263 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2264 HasConstCopyConstructor 2265 = FieldClassDecl->hasConstCopyConstructor(Context); 2266 } 2267 } 2268 2269 // Otherwise, the implicitly declared copy constructor will have 2270 // the form 2271 // 2272 // X::X(X&) 2273 QualType ArgType = ClassType; 2274 if (HasConstCopyConstructor) 2275 ArgType = ArgType.withConst(); 2276 ArgType = Context.getLValueReferenceType(ArgType); 2277 2278 // An implicitly-declared copy constructor is an inline public 2279 // member of its class. 2280 DeclarationName Name 2281 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2282 CXXConstructorDecl *CopyConstructor 2283 = CXXConstructorDecl::Create(Context, ClassDecl, 2284 ClassDecl->getLocation(), Name, 2285 Context.getFunctionType(Context.VoidTy, 2286 &ArgType, 1, 2287 false, 0, 2288 /*FIXME:*/false, 2289 false, 0, 0, false, 2290 CC_Default), 2291 /*TInfo=*/0, 2292 /*isExplicit=*/false, 2293 /*isInline=*/true, 2294 /*isImplicitlyDeclared=*/true); 2295 CopyConstructor->setAccess(AS_public); 2296 CopyConstructor->setImplicit(); 2297 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2298 2299 // Add the parameter to the constructor. 2300 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2301 ClassDecl->getLocation(), 2302 /*IdentifierInfo=*/0, 2303 ArgType, /*TInfo=*/0, 2304 VarDecl::None, 0); 2305 CopyConstructor->setParams(&FromParam, 1); 2306 ClassDecl->addDecl(CopyConstructor); 2307 } 2308 2309 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2310 // Note: The following rules are largely analoguous to the copy 2311 // constructor rules. Note that virtual bases are not taken into account 2312 // for determining the argument type of the operator. Note also that 2313 // operators taking an object instead of a reference are allowed. 2314 // 2315 // C++ [class.copy]p10: 2316 // If the class definition does not explicitly declare a copy 2317 // assignment operator, one is declared implicitly. 2318 // The implicitly-defined copy assignment operator for a class X 2319 // will have the form 2320 // 2321 // X& X::operator=(const X&) 2322 // 2323 // if 2324 bool HasConstCopyAssignment = true; 2325 2326 // -- each direct base class B of X has a copy assignment operator 2327 // whose parameter is of type const B&, const volatile B& or B, 2328 // and 2329 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2330 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2331 assert(!Base->getType()->isDependentType() && 2332 "Cannot generate implicit members for class with dependent bases."); 2333 const CXXRecordDecl *BaseClassDecl 2334 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2335 const CXXMethodDecl *MD = 0; 2336 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2337 MD); 2338 } 2339 2340 // -- for all the nonstatic data members of X that are of a class 2341 // type M (or array thereof), each such class type has a copy 2342 // assignment operator whose parameter is of type const M&, 2343 // const volatile M& or M. 2344 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2345 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2346 ++Field) { 2347 QualType FieldType = (*Field)->getType(); 2348 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2349 FieldType = Array->getElementType(); 2350 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2351 const CXXRecordDecl *FieldClassDecl 2352 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2353 const CXXMethodDecl *MD = 0; 2354 HasConstCopyAssignment 2355 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2356 } 2357 } 2358 2359 // Otherwise, the implicitly declared copy assignment operator will 2360 // have the form 2361 // 2362 // X& X::operator=(X&) 2363 QualType ArgType = ClassType; 2364 QualType RetType = Context.getLValueReferenceType(ArgType); 2365 if (HasConstCopyAssignment) 2366 ArgType = ArgType.withConst(); 2367 ArgType = Context.getLValueReferenceType(ArgType); 2368 2369 // An implicitly-declared copy assignment operator is an inline public 2370 // member of its class. 2371 DeclarationName Name = 2372 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2373 CXXMethodDecl *CopyAssignment = 2374 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2375 Context.getFunctionType(RetType, &ArgType, 1, 2376 false, 0, 2377 /*FIXME:*/false, 2378 false, 0, 0, false, 2379 CC_Default), 2380 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2381 CopyAssignment->setAccess(AS_public); 2382 CopyAssignment->setImplicit(); 2383 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2384 CopyAssignment->setCopyAssignment(true); 2385 2386 // Add the parameter to the operator. 2387 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2388 ClassDecl->getLocation(), 2389 /*IdentifierInfo=*/0, 2390 ArgType, /*TInfo=*/0, 2391 VarDecl::None, 0); 2392 CopyAssignment->setParams(&FromParam, 1); 2393 2394 // Don't call addedAssignmentOperator. There is no way to distinguish an 2395 // implicit from an explicit assignment operator. 2396 ClassDecl->addDecl(CopyAssignment); 2397 AddOverriddenMethods(ClassDecl, CopyAssignment); 2398 } 2399 2400 if (!ClassDecl->hasUserDeclaredDestructor()) { 2401 // C++ [class.dtor]p2: 2402 // If a class has no user-declared destructor, a destructor is 2403 // declared implicitly. An implicitly-declared destructor is an 2404 // inline public member of its class. 2405 QualType Ty = Context.getFunctionType(Context.VoidTy, 2406 0, 0, false, 0, 2407 /*FIXME:*/false, 2408 false, 0, 0, false, 2409 CC_Default); 2410 2411 DeclarationName Name 2412 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2413 CXXDestructorDecl *Destructor 2414 = CXXDestructorDecl::Create(Context, ClassDecl, 2415 ClassDecl->getLocation(), Name, Ty, 2416 /*isInline=*/true, 2417 /*isImplicitlyDeclared=*/true); 2418 Destructor->setAccess(AS_public); 2419 Destructor->setImplicit(); 2420 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2421 ClassDecl->addDecl(Destructor); 2422 2423 // This could be uniqued if it ever proves significant. 2424 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2425 2426 AddOverriddenMethods(ClassDecl, Destructor); 2427 } 2428} 2429 2430void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2431 Decl *D = TemplateD.getAs<Decl>(); 2432 if (!D) 2433 return; 2434 2435 TemplateParameterList *Params = 0; 2436 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2437 Params = Template->getTemplateParameters(); 2438 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2439 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2440 Params = PartialSpec->getTemplateParameters(); 2441 else 2442 return; 2443 2444 for (TemplateParameterList::iterator Param = Params->begin(), 2445 ParamEnd = Params->end(); 2446 Param != ParamEnd; ++Param) { 2447 NamedDecl *Named = cast<NamedDecl>(*Param); 2448 if (Named->getDeclName()) { 2449 S->AddDecl(DeclPtrTy::make(Named)); 2450 IdResolver.AddDecl(Named); 2451 } 2452 } 2453} 2454 2455void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2456 if (!RecordD) return; 2457 AdjustDeclIfTemplate(RecordD); 2458 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2459 PushDeclContext(S, Record); 2460} 2461 2462void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2463 if (!RecordD) return; 2464 PopDeclContext(); 2465} 2466 2467/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2468/// parsing a top-level (non-nested) C++ class, and we are now 2469/// parsing those parts of the given Method declaration that could 2470/// not be parsed earlier (C++ [class.mem]p2), such as default 2471/// arguments. This action should enter the scope of the given 2472/// Method declaration as if we had just parsed the qualified method 2473/// name. However, it should not bring the parameters into scope; 2474/// that will be performed by ActOnDelayedCXXMethodParameter. 2475void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2476} 2477 2478/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2479/// C++ method declaration. We're (re-)introducing the given 2480/// function parameter into scope for use in parsing later parts of 2481/// the method declaration. For example, we could see an 2482/// ActOnParamDefaultArgument event for this parameter. 2483void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2484 if (!ParamD) 2485 return; 2486 2487 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2488 2489 // If this parameter has an unparsed default argument, clear it out 2490 // to make way for the parsed default argument. 2491 if (Param->hasUnparsedDefaultArg()) 2492 Param->setDefaultArg(0); 2493 2494 S->AddDecl(DeclPtrTy::make(Param)); 2495 if (Param->getDeclName()) 2496 IdResolver.AddDecl(Param); 2497} 2498 2499/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2500/// processing the delayed method declaration for Method. The method 2501/// declaration is now considered finished. There may be a separate 2502/// ActOnStartOfFunctionDef action later (not necessarily 2503/// immediately!) for this method, if it was also defined inside the 2504/// class body. 2505void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2506 if (!MethodD) 2507 return; 2508 2509 AdjustDeclIfTemplate(MethodD); 2510 2511 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2512 2513 // Now that we have our default arguments, check the constructor 2514 // again. It could produce additional diagnostics or affect whether 2515 // the class has implicitly-declared destructors, among other 2516 // things. 2517 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2518 CheckConstructor(Constructor); 2519 2520 // Check the default arguments, which we may have added. 2521 if (!Method->isInvalidDecl()) 2522 CheckCXXDefaultArguments(Method); 2523} 2524 2525/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2526/// the well-formedness of the constructor declarator @p D with type @p 2527/// R. If there are any errors in the declarator, this routine will 2528/// emit diagnostics and set the invalid bit to true. In any case, the type 2529/// will be updated to reflect a well-formed type for the constructor and 2530/// returned. 2531QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2532 FunctionDecl::StorageClass &SC) { 2533 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2534 2535 // C++ [class.ctor]p3: 2536 // A constructor shall not be virtual (10.3) or static (9.4). A 2537 // constructor can be invoked for a const, volatile or const 2538 // volatile object. A constructor shall not be declared const, 2539 // volatile, or const volatile (9.3.2). 2540 if (isVirtual) { 2541 if (!D.isInvalidType()) 2542 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2543 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2544 << SourceRange(D.getIdentifierLoc()); 2545 D.setInvalidType(); 2546 } 2547 if (SC == FunctionDecl::Static) { 2548 if (!D.isInvalidType()) 2549 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2550 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2551 << SourceRange(D.getIdentifierLoc()); 2552 D.setInvalidType(); 2553 SC = FunctionDecl::None; 2554 } 2555 2556 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2557 if (FTI.TypeQuals != 0) { 2558 if (FTI.TypeQuals & Qualifiers::Const) 2559 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2560 << "const" << SourceRange(D.getIdentifierLoc()); 2561 if (FTI.TypeQuals & Qualifiers::Volatile) 2562 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2563 << "volatile" << SourceRange(D.getIdentifierLoc()); 2564 if (FTI.TypeQuals & Qualifiers::Restrict) 2565 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2566 << "restrict" << SourceRange(D.getIdentifierLoc()); 2567 } 2568 2569 // Rebuild the function type "R" without any type qualifiers (in 2570 // case any of the errors above fired) and with "void" as the 2571 // return type, since constructors don't have return types. We 2572 // *always* have to do this, because GetTypeForDeclarator will 2573 // put in a result type of "int" when none was specified. 2574 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2575 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2576 Proto->getNumArgs(), 2577 Proto->isVariadic(), 0, 2578 Proto->hasExceptionSpec(), 2579 Proto->hasAnyExceptionSpec(), 2580 Proto->getNumExceptions(), 2581 Proto->exception_begin(), 2582 Proto->getNoReturnAttr(), 2583 Proto->getCallConv()); 2584} 2585 2586/// CheckConstructor - Checks a fully-formed constructor for 2587/// well-formedness, issuing any diagnostics required. Returns true if 2588/// the constructor declarator is invalid. 2589void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2590 CXXRecordDecl *ClassDecl 2591 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2592 if (!ClassDecl) 2593 return Constructor->setInvalidDecl(); 2594 2595 // C++ [class.copy]p3: 2596 // A declaration of a constructor for a class X is ill-formed if 2597 // its first parameter is of type (optionally cv-qualified) X and 2598 // either there are no other parameters or else all other 2599 // parameters have default arguments. 2600 if (!Constructor->isInvalidDecl() && 2601 ((Constructor->getNumParams() == 1) || 2602 (Constructor->getNumParams() > 1 && 2603 Constructor->getParamDecl(1)->hasDefaultArg())) && 2604 Constructor->getTemplateSpecializationKind() 2605 != TSK_ImplicitInstantiation) { 2606 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2607 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2608 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2609 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2610 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2611 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2612 2613 // FIXME: Rather that making the constructor invalid, we should endeavor 2614 // to fix the type. 2615 Constructor->setInvalidDecl(); 2616 } 2617 } 2618 2619 // Notify the class that we've added a constructor. 2620 ClassDecl->addedConstructor(Context, Constructor); 2621} 2622 2623/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2624/// issuing any diagnostics required. Returns true on error. 2625bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2626 CXXRecordDecl *RD = Destructor->getParent(); 2627 2628 if (Destructor->isVirtual()) { 2629 SourceLocation Loc; 2630 2631 if (!Destructor->isImplicit()) 2632 Loc = Destructor->getLocation(); 2633 else 2634 Loc = RD->getLocation(); 2635 2636 // If we have a virtual destructor, look up the deallocation function 2637 FunctionDecl *OperatorDelete = 0; 2638 DeclarationName Name = 2639 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2640 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2641 return true; 2642 2643 Destructor->setOperatorDelete(OperatorDelete); 2644 } 2645 2646 return false; 2647} 2648 2649static inline bool 2650FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2651 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2652 FTI.ArgInfo[0].Param && 2653 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2654} 2655 2656/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2657/// the well-formednes of the destructor declarator @p D with type @p 2658/// R. If there are any errors in the declarator, this routine will 2659/// emit diagnostics and set the declarator to invalid. Even if this happens, 2660/// will be updated to reflect a well-formed type for the destructor and 2661/// returned. 2662QualType Sema::CheckDestructorDeclarator(Declarator &D, 2663 FunctionDecl::StorageClass& SC) { 2664 // C++ [class.dtor]p1: 2665 // [...] A typedef-name that names a class is a class-name 2666 // (7.1.3); however, a typedef-name that names a class shall not 2667 // be used as the identifier in the declarator for a destructor 2668 // declaration. 2669 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2670 if (isa<TypedefType>(DeclaratorType)) { 2671 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2672 << DeclaratorType; 2673 D.setInvalidType(); 2674 } 2675 2676 // C++ [class.dtor]p2: 2677 // A destructor is used to destroy objects of its class type. A 2678 // destructor takes no parameters, and no return type can be 2679 // specified for it (not even void). The address of a destructor 2680 // shall not be taken. A destructor shall not be static. A 2681 // destructor can be invoked for a const, volatile or const 2682 // volatile object. A destructor shall not be declared const, 2683 // volatile or const volatile (9.3.2). 2684 if (SC == FunctionDecl::Static) { 2685 if (!D.isInvalidType()) 2686 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2687 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2688 << SourceRange(D.getIdentifierLoc()); 2689 SC = FunctionDecl::None; 2690 D.setInvalidType(); 2691 } 2692 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2693 // Destructors don't have return types, but the parser will 2694 // happily parse something like: 2695 // 2696 // class X { 2697 // float ~X(); 2698 // }; 2699 // 2700 // The return type will be eliminated later. 2701 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2702 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2703 << SourceRange(D.getIdentifierLoc()); 2704 } 2705 2706 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2707 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2708 if (FTI.TypeQuals & Qualifiers::Const) 2709 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2710 << "const" << SourceRange(D.getIdentifierLoc()); 2711 if (FTI.TypeQuals & Qualifiers::Volatile) 2712 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2713 << "volatile" << SourceRange(D.getIdentifierLoc()); 2714 if (FTI.TypeQuals & Qualifiers::Restrict) 2715 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2716 << "restrict" << SourceRange(D.getIdentifierLoc()); 2717 D.setInvalidType(); 2718 } 2719 2720 // Make sure we don't have any parameters. 2721 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2722 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2723 2724 // Delete the parameters. 2725 FTI.freeArgs(); 2726 D.setInvalidType(); 2727 } 2728 2729 // Make sure the destructor isn't variadic. 2730 if (FTI.isVariadic) { 2731 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2732 D.setInvalidType(); 2733 } 2734 2735 // Rebuild the function type "R" without any type qualifiers or 2736 // parameters (in case any of the errors above fired) and with 2737 // "void" as the return type, since destructors don't have return 2738 // types. We *always* have to do this, because GetTypeForDeclarator 2739 // will put in a result type of "int" when none was specified. 2740 // FIXME: Exceptions! 2741 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2742 false, false, 0, 0, false, CC_Default); 2743} 2744 2745/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2746/// well-formednes of the conversion function declarator @p D with 2747/// type @p R. If there are any errors in the declarator, this routine 2748/// will emit diagnostics and return true. Otherwise, it will return 2749/// false. Either way, the type @p R will be updated to reflect a 2750/// well-formed type for the conversion operator. 2751void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2752 FunctionDecl::StorageClass& SC) { 2753 // C++ [class.conv.fct]p1: 2754 // Neither parameter types nor return type can be specified. The 2755 // type of a conversion function (8.3.5) is "function taking no 2756 // parameter returning conversion-type-id." 2757 if (SC == FunctionDecl::Static) { 2758 if (!D.isInvalidType()) 2759 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2760 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2761 << SourceRange(D.getIdentifierLoc()); 2762 D.setInvalidType(); 2763 SC = FunctionDecl::None; 2764 } 2765 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2766 // Conversion functions don't have return types, but the parser will 2767 // happily parse something like: 2768 // 2769 // class X { 2770 // float operator bool(); 2771 // }; 2772 // 2773 // The return type will be changed later anyway. 2774 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2775 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2776 << SourceRange(D.getIdentifierLoc()); 2777 } 2778 2779 // Make sure we don't have any parameters. 2780 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2781 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2782 2783 // Delete the parameters. 2784 D.getTypeObject(0).Fun.freeArgs(); 2785 D.setInvalidType(); 2786 } 2787 2788 // Make sure the conversion function isn't variadic. 2789 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2790 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2791 D.setInvalidType(); 2792 } 2793 2794 // C++ [class.conv.fct]p4: 2795 // The conversion-type-id shall not represent a function type nor 2796 // an array type. 2797 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2798 if (ConvType->isArrayType()) { 2799 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2800 ConvType = Context.getPointerType(ConvType); 2801 D.setInvalidType(); 2802 } else if (ConvType->isFunctionType()) { 2803 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2804 ConvType = Context.getPointerType(ConvType); 2805 D.setInvalidType(); 2806 } 2807 2808 // Rebuild the function type "R" without any parameters (in case any 2809 // of the errors above fired) and with the conversion type as the 2810 // return type. 2811 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2812 R = Context.getFunctionType(ConvType, 0, 0, false, 2813 Proto->getTypeQuals(), 2814 Proto->hasExceptionSpec(), 2815 Proto->hasAnyExceptionSpec(), 2816 Proto->getNumExceptions(), 2817 Proto->exception_begin(), 2818 Proto->getNoReturnAttr(), 2819 Proto->getCallConv()); 2820 2821 // C++0x explicit conversion operators. 2822 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2823 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2824 diag::warn_explicit_conversion_functions) 2825 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2826} 2827 2828/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2829/// the declaration of the given C++ conversion function. This routine 2830/// is responsible for recording the conversion function in the C++ 2831/// class, if possible. 2832Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2833 assert(Conversion && "Expected to receive a conversion function declaration"); 2834 2835 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2836 2837 // Make sure we aren't redeclaring the conversion function. 2838 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2839 2840 // C++ [class.conv.fct]p1: 2841 // [...] A conversion function is never used to convert a 2842 // (possibly cv-qualified) object to the (possibly cv-qualified) 2843 // same object type (or a reference to it), to a (possibly 2844 // cv-qualified) base class of that type (or a reference to it), 2845 // or to (possibly cv-qualified) void. 2846 // FIXME: Suppress this warning if the conversion function ends up being a 2847 // virtual function that overrides a virtual function in a base class. 2848 QualType ClassType 2849 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2850 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2851 ConvType = ConvTypeRef->getPointeeType(); 2852 if (ConvType->isRecordType()) { 2853 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2854 if (ConvType == ClassType) 2855 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2856 << ClassType; 2857 else if (IsDerivedFrom(ClassType, ConvType)) 2858 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2859 << ClassType << ConvType; 2860 } else if (ConvType->isVoidType()) { 2861 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2862 << ClassType << ConvType; 2863 } 2864 2865 if (Conversion->getPrimaryTemplate()) { 2866 // ignore specializations 2867 } else if (Conversion->getPreviousDeclaration()) { 2868 if (FunctionTemplateDecl *ConversionTemplate 2869 = Conversion->getDescribedFunctionTemplate()) { 2870 if (ClassDecl->replaceConversion( 2871 ConversionTemplate->getPreviousDeclaration(), 2872 ConversionTemplate)) 2873 return DeclPtrTy::make(ConversionTemplate); 2874 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2875 Conversion)) 2876 return DeclPtrTy::make(Conversion); 2877 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2878 } else if (FunctionTemplateDecl *ConversionTemplate 2879 = Conversion->getDescribedFunctionTemplate()) 2880 ClassDecl->addConversionFunction(ConversionTemplate); 2881 else 2882 ClassDecl->addConversionFunction(Conversion); 2883 2884 return DeclPtrTy::make(Conversion); 2885} 2886 2887//===----------------------------------------------------------------------===// 2888// Namespace Handling 2889//===----------------------------------------------------------------------===// 2890 2891/// ActOnStartNamespaceDef - This is called at the start of a namespace 2892/// definition. 2893Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2894 SourceLocation IdentLoc, 2895 IdentifierInfo *II, 2896 SourceLocation LBrace, 2897 AttributeList *AttrList) { 2898 NamespaceDecl *Namespc = 2899 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2900 Namespc->setLBracLoc(LBrace); 2901 2902 Scope *DeclRegionScope = NamespcScope->getParent(); 2903 2904 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2905 2906 if (II) { 2907 // C++ [namespace.def]p2: 2908 // The identifier in an original-namespace-definition shall not have been 2909 // previously defined in the declarative region in which the 2910 // original-namespace-definition appears. The identifier in an 2911 // original-namespace-definition is the name of the namespace. Subsequently 2912 // in that declarative region, it is treated as an original-namespace-name. 2913 2914 NamedDecl *PrevDecl 2915 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2916 ForRedeclaration); 2917 2918 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2919 // This is an extended namespace definition. 2920 // Attach this namespace decl to the chain of extended namespace 2921 // definitions. 2922 OrigNS->setNextNamespace(Namespc); 2923 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2924 2925 // Remove the previous declaration from the scope. 2926 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2927 IdResolver.RemoveDecl(OrigNS); 2928 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2929 } 2930 } else if (PrevDecl) { 2931 // This is an invalid name redefinition. 2932 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2933 << Namespc->getDeclName(); 2934 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2935 Namespc->setInvalidDecl(); 2936 // Continue on to push Namespc as current DeclContext and return it. 2937 } else if (II->isStr("std") && 2938 CurContext->getLookupContext()->isTranslationUnit()) { 2939 // This is the first "real" definition of the namespace "std", so update 2940 // our cache of the "std" namespace to point at this definition. 2941 if (StdNamespace) { 2942 // We had already defined a dummy namespace "std". Link this new 2943 // namespace definition to the dummy namespace "std". 2944 StdNamespace->setNextNamespace(Namespc); 2945 StdNamespace->setLocation(IdentLoc); 2946 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2947 } 2948 2949 // Make our StdNamespace cache point at the first real definition of the 2950 // "std" namespace. 2951 StdNamespace = Namespc; 2952 } 2953 2954 PushOnScopeChains(Namespc, DeclRegionScope); 2955 } else { 2956 // Anonymous namespaces. 2957 assert(Namespc->isAnonymousNamespace()); 2958 2959 // Link the anonymous namespace into its parent. 2960 NamespaceDecl *PrevDecl; 2961 DeclContext *Parent = CurContext->getLookupContext(); 2962 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2963 PrevDecl = TU->getAnonymousNamespace(); 2964 TU->setAnonymousNamespace(Namespc); 2965 } else { 2966 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2967 PrevDecl = ND->getAnonymousNamespace(); 2968 ND->setAnonymousNamespace(Namespc); 2969 } 2970 2971 // Link the anonymous namespace with its previous declaration. 2972 if (PrevDecl) { 2973 assert(PrevDecl->isAnonymousNamespace()); 2974 assert(!PrevDecl->getNextNamespace()); 2975 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2976 PrevDecl->setNextNamespace(Namespc); 2977 } 2978 2979 CurContext->addDecl(Namespc); 2980 2981 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2982 // behaves as if it were replaced by 2983 // namespace unique { /* empty body */ } 2984 // using namespace unique; 2985 // namespace unique { namespace-body } 2986 // where all occurrences of 'unique' in a translation unit are 2987 // replaced by the same identifier and this identifier differs 2988 // from all other identifiers in the entire program. 2989 2990 // We just create the namespace with an empty name and then add an 2991 // implicit using declaration, just like the standard suggests. 2992 // 2993 // CodeGen enforces the "universally unique" aspect by giving all 2994 // declarations semantically contained within an anonymous 2995 // namespace internal linkage. 2996 2997 if (!PrevDecl) { 2998 UsingDirectiveDecl* UD 2999 = UsingDirectiveDecl::Create(Context, CurContext, 3000 /* 'using' */ LBrace, 3001 /* 'namespace' */ SourceLocation(), 3002 /* qualifier */ SourceRange(), 3003 /* NNS */ NULL, 3004 /* identifier */ SourceLocation(), 3005 Namespc, 3006 /* Ancestor */ CurContext); 3007 UD->setImplicit(); 3008 CurContext->addDecl(UD); 3009 } 3010 } 3011 3012 // Although we could have an invalid decl (i.e. the namespace name is a 3013 // redefinition), push it as current DeclContext and try to continue parsing. 3014 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3015 // for the namespace has the declarations that showed up in that particular 3016 // namespace definition. 3017 PushDeclContext(NamespcScope, Namespc); 3018 return DeclPtrTy::make(Namespc); 3019} 3020 3021/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3022/// is a namespace alias, returns the namespace it points to. 3023static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3024 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3025 return AD->getNamespace(); 3026 return dyn_cast_or_null<NamespaceDecl>(D); 3027} 3028 3029/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3030/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3031void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3032 Decl *Dcl = D.getAs<Decl>(); 3033 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3034 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3035 Namespc->setRBracLoc(RBrace); 3036 PopDeclContext(); 3037} 3038 3039Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3040 SourceLocation UsingLoc, 3041 SourceLocation NamespcLoc, 3042 const CXXScopeSpec &SS, 3043 SourceLocation IdentLoc, 3044 IdentifierInfo *NamespcName, 3045 AttributeList *AttrList) { 3046 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3047 assert(NamespcName && "Invalid NamespcName."); 3048 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3049 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3050 3051 UsingDirectiveDecl *UDir = 0; 3052 3053 // Lookup namespace name. 3054 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3055 LookupParsedName(R, S, &SS); 3056 if (R.isAmbiguous()) 3057 return DeclPtrTy(); 3058 3059 if (!R.empty()) { 3060 NamedDecl *Named = R.getFoundDecl(); 3061 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3062 && "expected namespace decl"); 3063 // C++ [namespace.udir]p1: 3064 // A using-directive specifies that the names in the nominated 3065 // namespace can be used in the scope in which the 3066 // using-directive appears after the using-directive. During 3067 // unqualified name lookup (3.4.1), the names appear as if they 3068 // were declared in the nearest enclosing namespace which 3069 // contains both the using-directive and the nominated 3070 // namespace. [Note: in this context, "contains" means "contains 3071 // directly or indirectly". ] 3072 3073 // Find enclosing context containing both using-directive and 3074 // nominated namespace. 3075 NamespaceDecl *NS = getNamespaceDecl(Named); 3076 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3077 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3078 CommonAncestor = CommonAncestor->getParent(); 3079 3080 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3081 SS.getRange(), 3082 (NestedNameSpecifier *)SS.getScopeRep(), 3083 IdentLoc, Named, CommonAncestor); 3084 PushUsingDirective(S, UDir); 3085 } else { 3086 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3087 } 3088 3089 // FIXME: We ignore attributes for now. 3090 delete AttrList; 3091 return DeclPtrTy::make(UDir); 3092} 3093 3094void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3095 // If scope has associated entity, then using directive is at namespace 3096 // or translation unit scope. We add UsingDirectiveDecls, into 3097 // it's lookup structure. 3098 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3099 Ctx->addDecl(UDir); 3100 else 3101 // Otherwise it is block-sope. using-directives will affect lookup 3102 // only to the end of scope. 3103 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3104} 3105 3106 3107Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3108 AccessSpecifier AS, 3109 bool HasUsingKeyword, 3110 SourceLocation UsingLoc, 3111 const CXXScopeSpec &SS, 3112 UnqualifiedId &Name, 3113 AttributeList *AttrList, 3114 bool IsTypeName, 3115 SourceLocation TypenameLoc) { 3116 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3117 3118 switch (Name.getKind()) { 3119 case UnqualifiedId::IK_Identifier: 3120 case UnqualifiedId::IK_OperatorFunctionId: 3121 case UnqualifiedId::IK_LiteralOperatorId: 3122 case UnqualifiedId::IK_ConversionFunctionId: 3123 break; 3124 3125 case UnqualifiedId::IK_ConstructorName: 3126 case UnqualifiedId::IK_ConstructorTemplateId: 3127 // C++0x inherited constructors. 3128 if (getLangOptions().CPlusPlus0x) break; 3129 3130 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3131 << SS.getRange(); 3132 return DeclPtrTy(); 3133 3134 case UnqualifiedId::IK_DestructorName: 3135 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3136 << SS.getRange(); 3137 return DeclPtrTy(); 3138 3139 case UnqualifiedId::IK_TemplateId: 3140 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3141 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3142 return DeclPtrTy(); 3143 } 3144 3145 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3146 if (!TargetName) 3147 return DeclPtrTy(); 3148 3149 // Warn about using declarations. 3150 // TODO: store that the declaration was written without 'using' and 3151 // talk about access decls instead of using decls in the 3152 // diagnostics. 3153 if (!HasUsingKeyword) { 3154 UsingLoc = Name.getSourceRange().getBegin(); 3155 3156 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3157 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3158 "using "); 3159 } 3160 3161 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3162 Name.getSourceRange().getBegin(), 3163 TargetName, AttrList, 3164 /* IsInstantiation */ false, 3165 IsTypeName, TypenameLoc); 3166 if (UD) 3167 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3168 3169 return DeclPtrTy::make(UD); 3170} 3171 3172/// Determines whether to create a using shadow decl for a particular 3173/// decl, given the set of decls existing prior to this using lookup. 3174bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3175 const LookupResult &Previous) { 3176 // Diagnose finding a decl which is not from a base class of the 3177 // current class. We do this now because there are cases where this 3178 // function will silently decide not to build a shadow decl, which 3179 // will pre-empt further diagnostics. 3180 // 3181 // We don't need to do this in C++0x because we do the check once on 3182 // the qualifier. 3183 // 3184 // FIXME: diagnose the following if we care enough: 3185 // struct A { int foo; }; 3186 // struct B : A { using A::foo; }; 3187 // template <class T> struct C : A {}; 3188 // template <class T> struct D : C<T> { using B::foo; } // <--- 3189 // This is invalid (during instantiation) in C++03 because B::foo 3190 // resolves to the using decl in B, which is not a base class of D<T>. 3191 // We can't diagnose it immediately because C<T> is an unknown 3192 // specialization. The UsingShadowDecl in D<T> then points directly 3193 // to A::foo, which will look well-formed when we instantiate. 3194 // The right solution is to not collapse the shadow-decl chain. 3195 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3196 DeclContext *OrigDC = Orig->getDeclContext(); 3197 3198 // Handle enums and anonymous structs. 3199 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3200 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3201 while (OrigRec->isAnonymousStructOrUnion()) 3202 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3203 3204 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3205 if (OrigDC == CurContext) { 3206 Diag(Using->getLocation(), 3207 diag::err_using_decl_nested_name_specifier_is_current_class) 3208 << Using->getNestedNameRange(); 3209 Diag(Orig->getLocation(), diag::note_using_decl_target); 3210 return true; 3211 } 3212 3213 Diag(Using->getNestedNameRange().getBegin(), 3214 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3215 << Using->getTargetNestedNameDecl() 3216 << cast<CXXRecordDecl>(CurContext) 3217 << Using->getNestedNameRange(); 3218 Diag(Orig->getLocation(), diag::note_using_decl_target); 3219 return true; 3220 } 3221 } 3222 3223 if (Previous.empty()) return false; 3224 3225 NamedDecl *Target = Orig; 3226 if (isa<UsingShadowDecl>(Target)) 3227 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3228 3229 // If the target happens to be one of the previous declarations, we 3230 // don't have a conflict. 3231 // 3232 // FIXME: but we might be increasing its access, in which case we 3233 // should redeclare it. 3234 NamedDecl *NonTag = 0, *Tag = 0; 3235 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3236 I != E; ++I) { 3237 NamedDecl *D = (*I)->getUnderlyingDecl(); 3238 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3239 return false; 3240 3241 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3242 } 3243 3244 if (Target->isFunctionOrFunctionTemplate()) { 3245 FunctionDecl *FD; 3246 if (isa<FunctionTemplateDecl>(Target)) 3247 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3248 else 3249 FD = cast<FunctionDecl>(Target); 3250 3251 NamedDecl *OldDecl = 0; 3252 switch (CheckOverload(FD, Previous, OldDecl)) { 3253 case Ovl_Overload: 3254 return false; 3255 3256 case Ovl_NonFunction: 3257 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3258 break; 3259 3260 // We found a decl with the exact signature. 3261 case Ovl_Match: 3262 if (isa<UsingShadowDecl>(OldDecl)) { 3263 // Silently ignore the possible conflict. 3264 return false; 3265 } 3266 3267 // If we're in a record, we want to hide the target, so we 3268 // return true (without a diagnostic) to tell the caller not to 3269 // build a shadow decl. 3270 if (CurContext->isRecord()) 3271 return true; 3272 3273 // If we're not in a record, this is an error. 3274 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3275 break; 3276 } 3277 3278 Diag(Target->getLocation(), diag::note_using_decl_target); 3279 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3280 return true; 3281 } 3282 3283 // Target is not a function. 3284 3285 if (isa<TagDecl>(Target)) { 3286 // No conflict between a tag and a non-tag. 3287 if (!Tag) return false; 3288 3289 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3290 Diag(Target->getLocation(), diag::note_using_decl_target); 3291 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3292 return true; 3293 } 3294 3295 // No conflict between a tag and a non-tag. 3296 if (!NonTag) return false; 3297 3298 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3299 Diag(Target->getLocation(), diag::note_using_decl_target); 3300 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3301 return true; 3302} 3303 3304/// Builds a shadow declaration corresponding to a 'using' declaration. 3305UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3306 UsingDecl *UD, 3307 NamedDecl *Orig) { 3308 3309 // If we resolved to another shadow declaration, just coalesce them. 3310 NamedDecl *Target = Orig; 3311 if (isa<UsingShadowDecl>(Target)) { 3312 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3313 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3314 } 3315 3316 UsingShadowDecl *Shadow 3317 = UsingShadowDecl::Create(Context, CurContext, 3318 UD->getLocation(), UD, Target); 3319 UD->addShadowDecl(Shadow); 3320 3321 if (S) 3322 PushOnScopeChains(Shadow, S); 3323 else 3324 CurContext->addDecl(Shadow); 3325 Shadow->setAccess(UD->getAccess()); 3326 3327 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3328 Shadow->setInvalidDecl(); 3329 3330 return Shadow; 3331} 3332 3333/// Hides a using shadow declaration. This is required by the current 3334/// using-decl implementation when a resolvable using declaration in a 3335/// class is followed by a declaration which would hide or override 3336/// one or more of the using decl's targets; for example: 3337/// 3338/// struct Base { void foo(int); }; 3339/// struct Derived : Base { 3340/// using Base::foo; 3341/// void foo(int); 3342/// }; 3343/// 3344/// The governing language is C++03 [namespace.udecl]p12: 3345/// 3346/// When a using-declaration brings names from a base class into a 3347/// derived class scope, member functions in the derived class 3348/// override and/or hide member functions with the same name and 3349/// parameter types in a base class (rather than conflicting). 3350/// 3351/// There are two ways to implement this: 3352/// (1) optimistically create shadow decls when they're not hidden 3353/// by existing declarations, or 3354/// (2) don't create any shadow decls (or at least don't make them 3355/// visible) until we've fully parsed/instantiated the class. 3356/// The problem with (1) is that we might have to retroactively remove 3357/// a shadow decl, which requires several O(n) operations because the 3358/// decl structures are (very reasonably) not designed for removal. 3359/// (2) avoids this but is very fiddly and phase-dependent. 3360void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3361 // Remove it from the DeclContext... 3362 Shadow->getDeclContext()->removeDecl(Shadow); 3363 3364 // ...and the scope, if applicable... 3365 if (S) { 3366 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3367 IdResolver.RemoveDecl(Shadow); 3368 } 3369 3370 // ...and the using decl. 3371 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3372 3373 // TODO: complain somehow if Shadow was used. It shouldn't 3374 // be possible for this to happen, because 3375} 3376 3377/// Builds a using declaration. 3378/// 3379/// \param IsInstantiation - Whether this call arises from an 3380/// instantiation of an unresolved using declaration. We treat 3381/// the lookup differently for these declarations. 3382NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3383 SourceLocation UsingLoc, 3384 const CXXScopeSpec &SS, 3385 SourceLocation IdentLoc, 3386 DeclarationName Name, 3387 AttributeList *AttrList, 3388 bool IsInstantiation, 3389 bool IsTypeName, 3390 SourceLocation TypenameLoc) { 3391 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3392 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3393 3394 // FIXME: We ignore attributes for now. 3395 delete AttrList; 3396 3397 if (SS.isEmpty()) { 3398 Diag(IdentLoc, diag::err_using_requires_qualname); 3399 return 0; 3400 } 3401 3402 // Do the redeclaration lookup in the current scope. 3403 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3404 ForRedeclaration); 3405 Previous.setHideTags(false); 3406 if (S) { 3407 LookupName(Previous, S); 3408 3409 // It is really dumb that we have to do this. 3410 LookupResult::Filter F = Previous.makeFilter(); 3411 while (F.hasNext()) { 3412 NamedDecl *D = F.next(); 3413 if (!isDeclInScope(D, CurContext, S)) 3414 F.erase(); 3415 } 3416 F.done(); 3417 } else { 3418 assert(IsInstantiation && "no scope in non-instantiation"); 3419 assert(CurContext->isRecord() && "scope not record in instantiation"); 3420 LookupQualifiedName(Previous, CurContext); 3421 } 3422 3423 NestedNameSpecifier *NNS = 3424 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3425 3426 // Check for invalid redeclarations. 3427 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3428 return 0; 3429 3430 // Check for bad qualifiers. 3431 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3432 return 0; 3433 3434 DeclContext *LookupContext = computeDeclContext(SS); 3435 NamedDecl *D; 3436 if (!LookupContext) { 3437 if (IsTypeName) { 3438 // FIXME: not all declaration name kinds are legal here 3439 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3440 UsingLoc, TypenameLoc, 3441 SS.getRange(), NNS, 3442 IdentLoc, Name); 3443 } else { 3444 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3445 UsingLoc, SS.getRange(), NNS, 3446 IdentLoc, Name); 3447 } 3448 } else { 3449 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3450 SS.getRange(), UsingLoc, NNS, Name, 3451 IsTypeName); 3452 } 3453 D->setAccess(AS); 3454 CurContext->addDecl(D); 3455 3456 if (!LookupContext) return D; 3457 UsingDecl *UD = cast<UsingDecl>(D); 3458 3459 if (RequireCompleteDeclContext(SS)) { 3460 UD->setInvalidDecl(); 3461 return UD; 3462 } 3463 3464 // Look up the target name. 3465 3466 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3467 3468 // Unlike most lookups, we don't always want to hide tag 3469 // declarations: tag names are visible through the using declaration 3470 // even if hidden by ordinary names, *except* in a dependent context 3471 // where it's important for the sanity of two-phase lookup. 3472 if (!IsInstantiation) 3473 R.setHideTags(false); 3474 3475 LookupQualifiedName(R, LookupContext); 3476 3477 if (R.empty()) { 3478 Diag(IdentLoc, diag::err_no_member) 3479 << Name << LookupContext << SS.getRange(); 3480 UD->setInvalidDecl(); 3481 return UD; 3482 } 3483 3484 if (R.isAmbiguous()) { 3485 UD->setInvalidDecl(); 3486 return UD; 3487 } 3488 3489 if (IsTypeName) { 3490 // If we asked for a typename and got a non-type decl, error out. 3491 if (!R.getAsSingle<TypeDecl>()) { 3492 Diag(IdentLoc, diag::err_using_typename_non_type); 3493 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3494 Diag((*I)->getUnderlyingDecl()->getLocation(), 3495 diag::note_using_decl_target); 3496 UD->setInvalidDecl(); 3497 return UD; 3498 } 3499 } else { 3500 // If we asked for a non-typename and we got a type, error out, 3501 // but only if this is an instantiation of an unresolved using 3502 // decl. Otherwise just silently find the type name. 3503 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3504 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3505 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3506 UD->setInvalidDecl(); 3507 return UD; 3508 } 3509 } 3510 3511 // C++0x N2914 [namespace.udecl]p6: 3512 // A using-declaration shall not name a namespace. 3513 if (R.getAsSingle<NamespaceDecl>()) { 3514 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3515 << SS.getRange(); 3516 UD->setInvalidDecl(); 3517 return UD; 3518 } 3519 3520 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3521 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3522 BuildUsingShadowDecl(S, UD, *I); 3523 } 3524 3525 return UD; 3526} 3527 3528/// Checks that the given using declaration is not an invalid 3529/// redeclaration. Note that this is checking only for the using decl 3530/// itself, not for any ill-formedness among the UsingShadowDecls. 3531bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3532 bool isTypeName, 3533 const CXXScopeSpec &SS, 3534 SourceLocation NameLoc, 3535 const LookupResult &Prev) { 3536 // C++03 [namespace.udecl]p8: 3537 // C++0x [namespace.udecl]p10: 3538 // A using-declaration is a declaration and can therefore be used 3539 // repeatedly where (and only where) multiple declarations are 3540 // allowed. 3541 // That's only in file contexts. 3542 if (CurContext->getLookupContext()->isFileContext()) 3543 return false; 3544 3545 NestedNameSpecifier *Qual 3546 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3547 3548 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3549 NamedDecl *D = *I; 3550 3551 bool DTypename; 3552 NestedNameSpecifier *DQual; 3553 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3554 DTypename = UD->isTypeName(); 3555 DQual = UD->getTargetNestedNameDecl(); 3556 } else if (UnresolvedUsingValueDecl *UD 3557 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3558 DTypename = false; 3559 DQual = UD->getTargetNestedNameSpecifier(); 3560 } else if (UnresolvedUsingTypenameDecl *UD 3561 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3562 DTypename = true; 3563 DQual = UD->getTargetNestedNameSpecifier(); 3564 } else continue; 3565 3566 // using decls differ if one says 'typename' and the other doesn't. 3567 // FIXME: non-dependent using decls? 3568 if (isTypeName != DTypename) continue; 3569 3570 // using decls differ if they name different scopes (but note that 3571 // template instantiation can cause this check to trigger when it 3572 // didn't before instantiation). 3573 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3574 Context.getCanonicalNestedNameSpecifier(DQual)) 3575 continue; 3576 3577 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3578 Diag(D->getLocation(), diag::note_using_decl) << 1; 3579 return true; 3580 } 3581 3582 return false; 3583} 3584 3585 3586/// Checks that the given nested-name qualifier used in a using decl 3587/// in the current context is appropriately related to the current 3588/// scope. If an error is found, diagnoses it and returns true. 3589bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3590 const CXXScopeSpec &SS, 3591 SourceLocation NameLoc) { 3592 DeclContext *NamedContext = computeDeclContext(SS); 3593 3594 if (!CurContext->isRecord()) { 3595 // C++03 [namespace.udecl]p3: 3596 // C++0x [namespace.udecl]p8: 3597 // A using-declaration for a class member shall be a member-declaration. 3598 3599 // If we weren't able to compute a valid scope, it must be a 3600 // dependent class scope. 3601 if (!NamedContext || NamedContext->isRecord()) { 3602 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3603 << SS.getRange(); 3604 return true; 3605 } 3606 3607 // Otherwise, everything is known to be fine. 3608 return false; 3609 } 3610 3611 // The current scope is a record. 3612 3613 // If the named context is dependent, we can't decide much. 3614 if (!NamedContext) { 3615 // FIXME: in C++0x, we can diagnose if we can prove that the 3616 // nested-name-specifier does not refer to a base class, which is 3617 // still possible in some cases. 3618 3619 // Otherwise we have to conservatively report that things might be 3620 // okay. 3621 return false; 3622 } 3623 3624 if (!NamedContext->isRecord()) { 3625 // Ideally this would point at the last name in the specifier, 3626 // but we don't have that level of source info. 3627 Diag(SS.getRange().getBegin(), 3628 diag::err_using_decl_nested_name_specifier_is_not_class) 3629 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3630 return true; 3631 } 3632 3633 if (getLangOptions().CPlusPlus0x) { 3634 // C++0x [namespace.udecl]p3: 3635 // In a using-declaration used as a member-declaration, the 3636 // nested-name-specifier shall name a base class of the class 3637 // being defined. 3638 3639 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3640 cast<CXXRecordDecl>(NamedContext))) { 3641 if (CurContext == NamedContext) { 3642 Diag(NameLoc, 3643 diag::err_using_decl_nested_name_specifier_is_current_class) 3644 << SS.getRange(); 3645 return true; 3646 } 3647 3648 Diag(SS.getRange().getBegin(), 3649 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3650 << (NestedNameSpecifier*) SS.getScopeRep() 3651 << cast<CXXRecordDecl>(CurContext) 3652 << SS.getRange(); 3653 return true; 3654 } 3655 3656 return false; 3657 } 3658 3659 // C++03 [namespace.udecl]p4: 3660 // A using-declaration used as a member-declaration shall refer 3661 // to a member of a base class of the class being defined [etc.]. 3662 3663 // Salient point: SS doesn't have to name a base class as long as 3664 // lookup only finds members from base classes. Therefore we can 3665 // diagnose here only if we can prove that that can't happen, 3666 // i.e. if the class hierarchies provably don't intersect. 3667 3668 // TODO: it would be nice if "definitely valid" results were cached 3669 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3670 // need to be repeated. 3671 3672 struct UserData { 3673 llvm::DenseSet<const CXXRecordDecl*> Bases; 3674 3675 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3676 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3677 Data->Bases.insert(Base); 3678 return true; 3679 } 3680 3681 bool hasDependentBases(const CXXRecordDecl *Class) { 3682 return !Class->forallBases(collect, this); 3683 } 3684 3685 /// Returns true if the base is dependent or is one of the 3686 /// accumulated base classes. 3687 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3688 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3689 return !Data->Bases.count(Base); 3690 } 3691 3692 bool mightShareBases(const CXXRecordDecl *Class) { 3693 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3694 } 3695 }; 3696 3697 UserData Data; 3698 3699 // Returns false if we find a dependent base. 3700 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3701 return false; 3702 3703 // Returns false if the class has a dependent base or if it or one 3704 // of its bases is present in the base set of the current context. 3705 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3706 return false; 3707 3708 Diag(SS.getRange().getBegin(), 3709 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3710 << (NestedNameSpecifier*) SS.getScopeRep() 3711 << cast<CXXRecordDecl>(CurContext) 3712 << SS.getRange(); 3713 3714 return true; 3715} 3716 3717Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3718 SourceLocation NamespaceLoc, 3719 SourceLocation AliasLoc, 3720 IdentifierInfo *Alias, 3721 const CXXScopeSpec &SS, 3722 SourceLocation IdentLoc, 3723 IdentifierInfo *Ident) { 3724 3725 // Lookup the namespace name. 3726 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3727 LookupParsedName(R, S, &SS); 3728 3729 // Check if we have a previous declaration with the same name. 3730 if (NamedDecl *PrevDecl 3731 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3732 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3733 // We already have an alias with the same name that points to the same 3734 // namespace, so don't create a new one. 3735 if (!R.isAmbiguous() && !R.empty() && 3736 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3737 return DeclPtrTy(); 3738 } 3739 3740 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3741 diag::err_redefinition_different_kind; 3742 Diag(AliasLoc, DiagID) << Alias; 3743 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3744 return DeclPtrTy(); 3745 } 3746 3747 if (R.isAmbiguous()) 3748 return DeclPtrTy(); 3749 3750 if (R.empty()) { 3751 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3752 return DeclPtrTy(); 3753 } 3754 3755 NamespaceAliasDecl *AliasDecl = 3756 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3757 Alias, SS.getRange(), 3758 (NestedNameSpecifier *)SS.getScopeRep(), 3759 IdentLoc, R.getFoundDecl()); 3760 3761 PushOnScopeChains(AliasDecl, S); 3762 return DeclPtrTy::make(AliasDecl); 3763} 3764 3765void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3766 CXXConstructorDecl *Constructor) { 3767 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3768 !Constructor->isUsed()) && 3769 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3770 3771 CXXRecordDecl *ClassDecl 3772 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3773 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3774 3775 DeclContext *PreviousContext = CurContext; 3776 CurContext = Constructor; 3777 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true, false)) { 3778 Diag(CurrentLocation, diag::note_member_synthesized_at) 3779 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3780 Constructor->setInvalidDecl(); 3781 } else { 3782 Constructor->setUsed(); 3783 } 3784 CurContext = PreviousContext; 3785} 3786 3787void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3788 CXXDestructorDecl *Destructor) { 3789 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3790 "DefineImplicitDestructor - call it for implicit default dtor"); 3791 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3792 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3793 3794 DeclContext *PreviousContext = CurContext; 3795 CurContext = Destructor; 3796 3797 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3798 Destructor->getParent()); 3799 3800 // FIXME: If CheckDestructor fails, we should emit a note about where the 3801 // implicit destructor was needed. 3802 if (CheckDestructor(Destructor)) { 3803 Diag(CurrentLocation, diag::note_member_synthesized_at) 3804 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3805 3806 Destructor->setInvalidDecl(); 3807 CurContext = PreviousContext; 3808 3809 return; 3810 } 3811 CurContext = PreviousContext; 3812 3813 Destructor->setUsed(); 3814} 3815 3816void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3817 CXXMethodDecl *MethodDecl) { 3818 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3819 MethodDecl->getOverloadedOperator() == OO_Equal && 3820 !MethodDecl->isUsed()) && 3821 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3822 3823 CXXRecordDecl *ClassDecl 3824 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3825 3826 DeclContext *PreviousContext = CurContext; 3827 CurContext = MethodDecl; 3828 3829 // C++[class.copy] p12 3830 // Before the implicitly-declared copy assignment operator for a class is 3831 // implicitly defined, all implicitly-declared copy assignment operators 3832 // for its direct base classes and its nonstatic data members shall have 3833 // been implicitly defined. 3834 bool err = false; 3835 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3836 E = ClassDecl->bases_end(); Base != E; ++Base) { 3837 CXXRecordDecl *BaseClassDecl 3838 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3839 if (CXXMethodDecl *BaseAssignOpMethod = 3840 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3841 BaseClassDecl)) { 3842 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3843 BaseAssignOpMethod, 3844 PartialDiagnostic(diag::err_access_assign_base) 3845 << Base->getType()); 3846 3847 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3848 } 3849 } 3850 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3851 E = ClassDecl->field_end(); Field != E; ++Field) { 3852 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3853 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3854 FieldType = Array->getElementType(); 3855 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3856 CXXRecordDecl *FieldClassDecl 3857 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3858 if (CXXMethodDecl *FieldAssignOpMethod = 3859 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3860 FieldClassDecl)) { 3861 CheckDirectMemberAccess(Field->getLocation(), 3862 FieldAssignOpMethod, 3863 PartialDiagnostic(diag::err_access_assign_field) 3864 << Field->getDeclName() << Field->getType()); 3865 3866 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3867 } 3868 } else if (FieldType->isReferenceType()) { 3869 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3870 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3871 Diag(Field->getLocation(), diag::note_declared_at); 3872 Diag(CurrentLocation, diag::note_first_required_here); 3873 err = true; 3874 } else if (FieldType.isConstQualified()) { 3875 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3876 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3877 Diag(Field->getLocation(), diag::note_declared_at); 3878 Diag(CurrentLocation, diag::note_first_required_here); 3879 err = true; 3880 } 3881 } 3882 if (!err) 3883 MethodDecl->setUsed(); 3884 3885 CurContext = PreviousContext; 3886} 3887 3888CXXMethodDecl * 3889Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3890 ParmVarDecl *ParmDecl, 3891 CXXRecordDecl *ClassDecl) { 3892 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3893 QualType RHSType(LHSType); 3894 // If class's assignment operator argument is const/volatile qualified, 3895 // look for operator = (const/volatile B&). Otherwise, look for 3896 // operator = (B&). 3897 RHSType = Context.getCVRQualifiedType(RHSType, 3898 ParmDecl->getType().getCVRQualifiers()); 3899 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3900 LHSType, 3901 SourceLocation())); 3902 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3903 RHSType, 3904 CurrentLocation)); 3905 Expr *Args[2] = { &*LHS, &*RHS }; 3906 OverloadCandidateSet CandidateSet(CurrentLocation); 3907 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3908 CandidateSet); 3909 OverloadCandidateSet::iterator Best; 3910 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3911 return cast<CXXMethodDecl>(Best->Function); 3912 assert(false && 3913 "getAssignOperatorMethod - copy assignment operator method not found"); 3914 return 0; 3915} 3916 3917void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3918 CXXConstructorDecl *CopyConstructor, 3919 unsigned TypeQuals) { 3920 assert((CopyConstructor->isImplicit() && 3921 CopyConstructor->isCopyConstructor(TypeQuals) && 3922 !CopyConstructor->isUsed()) && 3923 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3924 3925 CXXRecordDecl *ClassDecl 3926 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3927 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3928 3929 DeclContext *PreviousContext = CurContext; 3930 CurContext = CopyConstructor; 3931 3932 // C++ [class.copy] p209 3933 // Before the implicitly-declared copy constructor for a class is 3934 // implicitly defined, all the implicitly-declared copy constructors 3935 // for its base class and its non-static data members shall have been 3936 // implicitly defined. 3937 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3938 Base != ClassDecl->bases_end(); ++Base) { 3939 CXXRecordDecl *BaseClassDecl 3940 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3941 if (CXXConstructorDecl *BaseCopyCtor = 3942 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3943 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3944 BaseCopyCtor, 3945 PartialDiagnostic(diag::err_access_copy_base) 3946 << Base->getType()); 3947 3948 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3949 } 3950 } 3951 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3952 FieldEnd = ClassDecl->field_end(); 3953 Field != FieldEnd; ++Field) { 3954 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3955 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3956 FieldType = Array->getElementType(); 3957 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3958 CXXRecordDecl *FieldClassDecl 3959 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3960 if (CXXConstructorDecl *FieldCopyCtor = 3961 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 3962 CheckDirectMemberAccess(Field->getLocation(), 3963 FieldCopyCtor, 3964 PartialDiagnostic(diag::err_access_copy_field) 3965 << Field->getDeclName() << Field->getType()); 3966 3967 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3968 } 3969 } 3970 } 3971 CopyConstructor->setUsed(); 3972 3973 CurContext = PreviousContext; 3974} 3975 3976Sema::OwningExprResult 3977Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3978 CXXConstructorDecl *Constructor, 3979 MultiExprArg ExprArgs, 3980 bool RequiresZeroInit, 3981 bool BaseInitialization) { 3982 bool Elidable = false; 3983 3984 // C++ [class.copy]p15: 3985 // Whenever a temporary class object is copied using a copy constructor, and 3986 // this object and the copy have the same cv-unqualified type, an 3987 // implementation is permitted to treat the original and the copy as two 3988 // different ways of referring to the same object and not perform a copy at 3989 // all, even if the class copy constructor or destructor have side effects. 3990 3991 // FIXME: Is this enough? 3992 if (Constructor->isCopyConstructor()) { 3993 Expr *E = ((Expr **)ExprArgs.get())[0]; 3994 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3995 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3996 E = ICE->getSubExpr(); 3997 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3998 E = FCE->getSubExpr(); 3999 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 4000 E = BE->getSubExpr(); 4001 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4002 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4003 E = ICE->getSubExpr(); 4004 4005 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 4006 Elidable = !CE->getCallReturnType()->isReferenceType(); 4007 else if (isa<CXXTemporaryObjectExpr>(E)) 4008 Elidable = true; 4009 else if (isa<CXXConstructExpr>(E)) 4010 Elidable = true; 4011 } 4012 4013 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4014 Elidable, move(ExprArgs), RequiresZeroInit, 4015 BaseInitialization); 4016} 4017 4018/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4019/// including handling of its default argument expressions. 4020Sema::OwningExprResult 4021Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4022 CXXConstructorDecl *Constructor, bool Elidable, 4023 MultiExprArg ExprArgs, 4024 bool RequiresZeroInit, 4025 bool BaseInitialization) { 4026 unsigned NumExprs = ExprArgs.size(); 4027 Expr **Exprs = (Expr **)ExprArgs.release(); 4028 4029 MarkDeclarationReferenced(ConstructLoc, Constructor); 4030 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4031 Constructor, Elidable, Exprs, NumExprs, 4032 RequiresZeroInit, BaseInitialization)); 4033} 4034 4035bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4036 CXXConstructorDecl *Constructor, 4037 MultiExprArg Exprs) { 4038 OwningExprResult TempResult = 4039 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4040 move(Exprs)); 4041 if (TempResult.isInvalid()) 4042 return true; 4043 4044 Expr *Temp = TempResult.takeAs<Expr>(); 4045 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4046 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4047 VD->setInit(Temp); 4048 4049 return false; 4050} 4051 4052void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4053 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4054 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4055 !ClassDecl->hasTrivialDestructor()) { 4056 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4057 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4058 CheckDestructorAccess(VD->getLocation(), Destructor, 4059 PartialDiagnostic(diag::err_access_dtor_var) 4060 << VD->getDeclName() 4061 << VD->getType()); 4062 } 4063} 4064 4065/// AddCXXDirectInitializerToDecl - This action is called immediately after 4066/// ActOnDeclarator, when a C++ direct initializer is present. 4067/// e.g: "int x(1);" 4068void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4069 SourceLocation LParenLoc, 4070 MultiExprArg Exprs, 4071 SourceLocation *CommaLocs, 4072 SourceLocation RParenLoc) { 4073 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4074 Decl *RealDecl = Dcl.getAs<Decl>(); 4075 4076 // If there is no declaration, there was an error parsing it. Just ignore 4077 // the initializer. 4078 if (RealDecl == 0) 4079 return; 4080 4081 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4082 if (!VDecl) { 4083 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4084 RealDecl->setInvalidDecl(); 4085 return; 4086 } 4087 4088 // We will represent direct-initialization similarly to copy-initialization: 4089 // int x(1); -as-> int x = 1; 4090 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4091 // 4092 // Clients that want to distinguish between the two forms, can check for 4093 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4094 // A major benefit is that clients that don't particularly care about which 4095 // exactly form was it (like the CodeGen) can handle both cases without 4096 // special case code. 4097 4098 // C++ 8.5p11: 4099 // The form of initialization (using parentheses or '=') is generally 4100 // insignificant, but does matter when the entity being initialized has a 4101 // class type. 4102 QualType DeclInitType = VDecl->getType(); 4103 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4104 DeclInitType = Context.getBaseElementType(Array); 4105 4106 if (!VDecl->getType()->isDependentType() && 4107 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4108 diag::err_typecheck_decl_incomplete_type)) { 4109 VDecl->setInvalidDecl(); 4110 return; 4111 } 4112 4113 // The variable can not have an abstract class type. 4114 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4115 diag::err_abstract_type_in_decl, 4116 AbstractVariableType)) 4117 VDecl->setInvalidDecl(); 4118 4119 const VarDecl *Def; 4120 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4121 Diag(VDecl->getLocation(), diag::err_redefinition) 4122 << VDecl->getDeclName(); 4123 Diag(Def->getLocation(), diag::note_previous_definition); 4124 VDecl->setInvalidDecl(); 4125 return; 4126 } 4127 4128 // If either the declaration has a dependent type or if any of the 4129 // expressions is type-dependent, we represent the initialization 4130 // via a ParenListExpr for later use during template instantiation. 4131 if (VDecl->getType()->isDependentType() || 4132 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4133 // Let clients know that initialization was done with a direct initializer. 4134 VDecl->setCXXDirectInitializer(true); 4135 4136 // Store the initialization expressions as a ParenListExpr. 4137 unsigned NumExprs = Exprs.size(); 4138 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4139 (Expr **)Exprs.release(), 4140 NumExprs, RParenLoc)); 4141 return; 4142 } 4143 4144 // Capture the variable that is being initialized and the style of 4145 // initialization. 4146 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4147 4148 // FIXME: Poor source location information. 4149 InitializationKind Kind 4150 = InitializationKind::CreateDirect(VDecl->getLocation(), 4151 LParenLoc, RParenLoc); 4152 4153 InitializationSequence InitSeq(*this, Entity, Kind, 4154 (Expr**)Exprs.get(), Exprs.size()); 4155 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4156 if (Result.isInvalid()) { 4157 VDecl->setInvalidDecl(); 4158 return; 4159 } 4160 4161 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4162 VDecl->setInit(Result.takeAs<Expr>()); 4163 VDecl->setCXXDirectInitializer(true); 4164 4165 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4166 FinalizeVarWithDestructor(VDecl, Record); 4167} 4168 4169/// \brief Add the applicable constructor candidates for an initialization 4170/// by constructor. 4171static void AddConstructorInitializationCandidates(Sema &SemaRef, 4172 QualType ClassType, 4173 Expr **Args, 4174 unsigned NumArgs, 4175 InitializationKind Kind, 4176 OverloadCandidateSet &CandidateSet) { 4177 // C++ [dcl.init]p14: 4178 // If the initialization is direct-initialization, or if it is 4179 // copy-initialization where the cv-unqualified version of the 4180 // source type is the same class as, or a derived class of, the 4181 // class of the destination, constructors are considered. The 4182 // applicable constructors are enumerated (13.3.1.3), and the 4183 // best one is chosen through overload resolution (13.3). The 4184 // constructor so selected is called to initialize the object, 4185 // with the initializer expression(s) as its argument(s). If no 4186 // constructor applies, or the overload resolution is ambiguous, 4187 // the initialization is ill-formed. 4188 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4189 assert(ClassRec && "Can only initialize a class type here"); 4190 4191 // FIXME: When we decide not to synthesize the implicitly-declared 4192 // constructors, we'll need to make them appear here. 4193 4194 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4195 DeclarationName ConstructorName 4196 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4197 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4198 DeclContext::lookup_const_iterator Con, ConEnd; 4199 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4200 Con != ConEnd; ++Con) { 4201 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4202 4203 // Find the constructor (which may be a template). 4204 CXXConstructorDecl *Constructor = 0; 4205 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4206 if (ConstructorTmpl) 4207 Constructor 4208 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4209 else 4210 Constructor = cast<CXXConstructorDecl>(*Con); 4211 4212 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4213 (Kind.getKind() == InitializationKind::IK_Value) || 4214 (Kind.getKind() == InitializationKind::IK_Copy && 4215 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4216 ((Kind.getKind() == InitializationKind::IK_Default) && 4217 Constructor->isDefaultConstructor())) { 4218 if (ConstructorTmpl) 4219 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4220 /*ExplicitArgs*/ 0, 4221 Args, NumArgs, CandidateSet); 4222 else 4223 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4224 Args, NumArgs, CandidateSet); 4225 } 4226 } 4227} 4228 4229/// \brief Attempt to perform initialization by constructor 4230/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4231/// copy-initialization. 4232/// 4233/// This routine determines whether initialization by constructor is possible, 4234/// but it does not emit any diagnostics in the case where the initialization 4235/// is ill-formed. 4236/// 4237/// \param ClassType the type of the object being initialized, which must have 4238/// class type. 4239/// 4240/// \param Args the arguments provided to initialize the object 4241/// 4242/// \param NumArgs the number of arguments provided to initialize the object 4243/// 4244/// \param Kind the type of initialization being performed 4245/// 4246/// \returns the constructor used to initialize the object, if successful. 4247/// Otherwise, emits a diagnostic and returns NULL. 4248CXXConstructorDecl * 4249Sema::TryInitializationByConstructor(QualType ClassType, 4250 Expr **Args, unsigned NumArgs, 4251 SourceLocation Loc, 4252 InitializationKind Kind) { 4253 // Build the overload candidate set 4254 OverloadCandidateSet CandidateSet(Loc); 4255 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4256 CandidateSet); 4257 4258 // Determine whether we found a constructor we can use. 4259 OverloadCandidateSet::iterator Best; 4260 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4261 case OR_Success: 4262 case OR_Deleted: 4263 // We found a constructor. Return it. 4264 return cast<CXXConstructorDecl>(Best->Function); 4265 4266 case OR_No_Viable_Function: 4267 case OR_Ambiguous: 4268 // Overload resolution failed. Return nothing. 4269 return 0; 4270 } 4271 4272 // Silence GCC warning 4273 return 0; 4274} 4275 4276/// \brief Given a constructor and the set of arguments provided for the 4277/// constructor, convert the arguments and add any required default arguments 4278/// to form a proper call to this constructor. 4279/// 4280/// \returns true if an error occurred, false otherwise. 4281bool 4282Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4283 MultiExprArg ArgsPtr, 4284 SourceLocation Loc, 4285 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4286 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4287 unsigned NumArgs = ArgsPtr.size(); 4288 Expr **Args = (Expr **)ArgsPtr.get(); 4289 4290 const FunctionProtoType *Proto 4291 = Constructor->getType()->getAs<FunctionProtoType>(); 4292 assert(Proto && "Constructor without a prototype?"); 4293 unsigned NumArgsInProto = Proto->getNumArgs(); 4294 4295 // If too few arguments are available, we'll fill in the rest with defaults. 4296 if (NumArgs < NumArgsInProto) 4297 ConvertedArgs.reserve(NumArgsInProto); 4298 else 4299 ConvertedArgs.reserve(NumArgs); 4300 4301 VariadicCallType CallType = 4302 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4303 llvm::SmallVector<Expr *, 8> AllArgs; 4304 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4305 Proto, 0, Args, NumArgs, AllArgs, 4306 CallType); 4307 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4308 ConvertedArgs.push_back(AllArgs[i]); 4309 return Invalid; 4310} 4311 4312/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4313/// determine whether they are reference-related, 4314/// reference-compatible, reference-compatible with added 4315/// qualification, or incompatible, for use in C++ initialization by 4316/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4317/// type, and the first type (T1) is the pointee type of the reference 4318/// type being initialized. 4319Sema::ReferenceCompareResult 4320Sema::CompareReferenceRelationship(SourceLocation Loc, 4321 QualType OrigT1, QualType OrigT2, 4322 bool& DerivedToBase) { 4323 assert(!OrigT1->isReferenceType() && 4324 "T1 must be the pointee type of the reference type"); 4325 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4326 4327 QualType T1 = Context.getCanonicalType(OrigT1); 4328 QualType T2 = Context.getCanonicalType(OrigT2); 4329 Qualifiers T1Quals, T2Quals; 4330 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4331 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4332 4333 // C++ [dcl.init.ref]p4: 4334 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4335 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4336 // T1 is a base class of T2. 4337 if (UnqualT1 == UnqualT2) 4338 DerivedToBase = false; 4339 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4340 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4341 IsDerivedFrom(UnqualT2, UnqualT1)) 4342 DerivedToBase = true; 4343 else 4344 return Ref_Incompatible; 4345 4346 // At this point, we know that T1 and T2 are reference-related (at 4347 // least). 4348 4349 // If the type is an array type, promote the element qualifiers to the type 4350 // for comparison. 4351 if (isa<ArrayType>(T1) && T1Quals) 4352 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4353 if (isa<ArrayType>(T2) && T2Quals) 4354 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4355 4356 // C++ [dcl.init.ref]p4: 4357 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4358 // reference-related to T2 and cv1 is the same cv-qualification 4359 // as, or greater cv-qualification than, cv2. For purposes of 4360 // overload resolution, cases for which cv1 is greater 4361 // cv-qualification than cv2 are identified as 4362 // reference-compatible with added qualification (see 13.3.3.2). 4363 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4364 return Ref_Compatible; 4365 else if (T1.isMoreQualifiedThan(T2)) 4366 return Ref_Compatible_With_Added_Qualification; 4367 else 4368 return Ref_Related; 4369} 4370 4371/// CheckReferenceInit - Check the initialization of a reference 4372/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4373/// the initializer (either a simple initializer or an initializer 4374/// list), and DeclType is the type of the declaration. When ICS is 4375/// non-null, this routine will compute the implicit conversion 4376/// sequence according to C++ [over.ics.ref] and will not produce any 4377/// diagnostics; when ICS is null, it will emit diagnostics when any 4378/// errors are found. Either way, a return value of true indicates 4379/// that there was a failure, a return value of false indicates that 4380/// the reference initialization succeeded. 4381/// 4382/// When @p SuppressUserConversions, user-defined conversions are 4383/// suppressed. 4384/// When @p AllowExplicit, we also permit explicit user-defined 4385/// conversion functions. 4386/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4387/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4388/// This is used when this is called from a C-style cast. 4389bool 4390Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4391 SourceLocation DeclLoc, 4392 bool SuppressUserConversions, 4393 bool AllowExplicit, bool ForceRValue, 4394 ImplicitConversionSequence *ICS, 4395 bool IgnoreBaseAccess) { 4396 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4397 4398 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4399 QualType T2 = Init->getType(); 4400 4401 // If the initializer is the address of an overloaded function, try 4402 // to resolve the overloaded function. If all goes well, T2 is the 4403 // type of the resulting function. 4404 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4405 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4406 ICS != 0); 4407 if (Fn) { 4408 // Since we're performing this reference-initialization for 4409 // real, update the initializer with the resulting function. 4410 if (!ICS) { 4411 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4412 return true; 4413 4414 Init = FixOverloadedFunctionReference(Init, Fn); 4415 } 4416 4417 T2 = Fn->getType(); 4418 } 4419 } 4420 4421 // Compute some basic properties of the types and the initializer. 4422 bool isRValRef = DeclType->isRValueReferenceType(); 4423 bool DerivedToBase = false; 4424 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4425 Init->isLvalue(Context); 4426 ReferenceCompareResult RefRelationship 4427 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4428 4429 // Most paths end in a failed conversion. 4430 if (ICS) { 4431 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4432 } 4433 4434 // C++ [dcl.init.ref]p5: 4435 // A reference to type "cv1 T1" is initialized by an expression 4436 // of type "cv2 T2" as follows: 4437 4438 // -- If the initializer expression 4439 4440 // Rvalue references cannot bind to lvalues (N2812). 4441 // There is absolutely no situation where they can. In particular, note that 4442 // this is ill-formed, even if B has a user-defined conversion to A&&: 4443 // B b; 4444 // A&& r = b; 4445 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4446 if (!ICS) 4447 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4448 << Init->getSourceRange(); 4449 return true; 4450 } 4451 4452 bool BindsDirectly = false; 4453 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4454 // reference-compatible with "cv2 T2," or 4455 // 4456 // Note that the bit-field check is skipped if we are just computing 4457 // the implicit conversion sequence (C++ [over.best.ics]p2). 4458 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4459 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4460 BindsDirectly = true; 4461 4462 if (ICS) { 4463 // C++ [over.ics.ref]p1: 4464 // When a parameter of reference type binds directly (8.5.3) 4465 // to an argument expression, the implicit conversion sequence 4466 // is the identity conversion, unless the argument expression 4467 // has a type that is a derived class of the parameter type, 4468 // in which case the implicit conversion sequence is a 4469 // derived-to-base Conversion (13.3.3.1). 4470 ICS->setStandard(); 4471 ICS->Standard.First = ICK_Identity; 4472 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4473 ICS->Standard.Third = ICK_Identity; 4474 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4475 ICS->Standard.setToType(0, T2); 4476 ICS->Standard.setToType(1, T1); 4477 ICS->Standard.setToType(2, T1); 4478 ICS->Standard.ReferenceBinding = true; 4479 ICS->Standard.DirectBinding = true; 4480 ICS->Standard.RRefBinding = false; 4481 ICS->Standard.CopyConstructor = 0; 4482 4483 // Nothing more to do: the inaccessibility/ambiguity check for 4484 // derived-to-base conversions is suppressed when we're 4485 // computing the implicit conversion sequence (C++ 4486 // [over.best.ics]p2). 4487 return false; 4488 } else { 4489 // Perform the conversion. 4490 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4491 if (DerivedToBase) 4492 CK = CastExpr::CK_DerivedToBase; 4493 else if(CheckExceptionSpecCompatibility(Init, T1)) 4494 return true; 4495 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4496 } 4497 } 4498 4499 // -- has a class type (i.e., T2 is a class type) and can be 4500 // implicitly converted to an lvalue of type "cv3 T3," 4501 // where "cv1 T1" is reference-compatible with "cv3 T3" 4502 // 92) (this conversion is selected by enumerating the 4503 // applicable conversion functions (13.3.1.6) and choosing 4504 // the best one through overload resolution (13.3)), 4505 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4506 !RequireCompleteType(DeclLoc, T2, 0)) { 4507 CXXRecordDecl *T2RecordDecl 4508 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4509 4510 OverloadCandidateSet CandidateSet(DeclLoc); 4511 const UnresolvedSetImpl *Conversions 4512 = T2RecordDecl->getVisibleConversionFunctions(); 4513 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4514 E = Conversions->end(); I != E; ++I) { 4515 NamedDecl *D = *I; 4516 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4517 if (isa<UsingShadowDecl>(D)) 4518 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4519 4520 FunctionTemplateDecl *ConvTemplate 4521 = dyn_cast<FunctionTemplateDecl>(D); 4522 CXXConversionDecl *Conv; 4523 if (ConvTemplate) 4524 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4525 else 4526 Conv = cast<CXXConversionDecl>(D); 4527 4528 // If the conversion function doesn't return a reference type, 4529 // it can't be considered for this conversion. 4530 if (Conv->getConversionType()->isLValueReferenceType() && 4531 (AllowExplicit || !Conv->isExplicit())) { 4532 if (ConvTemplate) 4533 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4534 Init, DeclType, CandidateSet); 4535 else 4536 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4537 DeclType, CandidateSet); 4538 } 4539 } 4540 4541 OverloadCandidateSet::iterator Best; 4542 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4543 case OR_Success: 4544 // C++ [over.ics.ref]p1: 4545 // 4546 // [...] If the parameter binds directly to the result of 4547 // applying a conversion function to the argument 4548 // expression, the implicit conversion sequence is a 4549 // user-defined conversion sequence (13.3.3.1.2), with the 4550 // second standard conversion sequence either an identity 4551 // conversion or, if the conversion function returns an 4552 // entity of a type that is a derived class of the parameter 4553 // type, a derived-to-base Conversion. 4554 if (!Best->FinalConversion.DirectBinding) 4555 break; 4556 4557 // This is a direct binding. 4558 BindsDirectly = true; 4559 4560 if (ICS) { 4561 ICS->setUserDefined(); 4562 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4563 ICS->UserDefined.After = Best->FinalConversion; 4564 ICS->UserDefined.ConversionFunction = Best->Function; 4565 ICS->UserDefined.EllipsisConversion = false; 4566 assert(ICS->UserDefined.After.ReferenceBinding && 4567 ICS->UserDefined.After.DirectBinding && 4568 "Expected a direct reference binding!"); 4569 return false; 4570 } else { 4571 OwningExprResult InitConversion = 4572 BuildCXXCastArgument(DeclLoc, QualType(), 4573 CastExpr::CK_UserDefinedConversion, 4574 cast<CXXMethodDecl>(Best->Function), 4575 Owned(Init)); 4576 Init = InitConversion.takeAs<Expr>(); 4577 4578 if (CheckExceptionSpecCompatibility(Init, T1)) 4579 return true; 4580 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4581 /*isLvalue=*/true); 4582 } 4583 break; 4584 4585 case OR_Ambiguous: 4586 if (ICS) { 4587 ICS->setAmbiguous(); 4588 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4589 Cand != CandidateSet.end(); ++Cand) 4590 if (Cand->Viable) 4591 ICS->Ambiguous.addConversion(Cand->Function); 4592 break; 4593 } 4594 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4595 << Init->getSourceRange(); 4596 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4597 return true; 4598 4599 case OR_No_Viable_Function: 4600 case OR_Deleted: 4601 // There was no suitable conversion, or we found a deleted 4602 // conversion; continue with other checks. 4603 break; 4604 } 4605 } 4606 4607 if (BindsDirectly) { 4608 // C++ [dcl.init.ref]p4: 4609 // [...] In all cases where the reference-related or 4610 // reference-compatible relationship of two types is used to 4611 // establish the validity of a reference binding, and T1 is a 4612 // base class of T2, a program that necessitates such a binding 4613 // is ill-formed if T1 is an inaccessible (clause 11) or 4614 // ambiguous (10.2) base class of T2. 4615 // 4616 // Note that we only check this condition when we're allowed to 4617 // complain about errors, because we should not be checking for 4618 // ambiguity (or inaccessibility) unless the reference binding 4619 // actually happens. 4620 if (DerivedToBase) 4621 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4622 Init->getSourceRange(), 4623 IgnoreBaseAccess); 4624 else 4625 return false; 4626 } 4627 4628 // -- Otherwise, the reference shall be to a non-volatile const 4629 // type (i.e., cv1 shall be const), or the reference shall be an 4630 // rvalue reference and the initializer expression shall be an rvalue. 4631 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4632 if (!ICS) 4633 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4634 << T1.isVolatileQualified() 4635 << T1 << int(InitLvalue != Expr::LV_Valid) 4636 << T2 << Init->getSourceRange(); 4637 return true; 4638 } 4639 4640 // -- If the initializer expression is an rvalue, with T2 a 4641 // class type, and "cv1 T1" is reference-compatible with 4642 // "cv2 T2," the reference is bound in one of the 4643 // following ways (the choice is implementation-defined): 4644 // 4645 // -- The reference is bound to the object represented by 4646 // the rvalue (see 3.10) or to a sub-object within that 4647 // object. 4648 // 4649 // -- A temporary of type "cv1 T2" [sic] is created, and 4650 // a constructor is called to copy the entire rvalue 4651 // object into the temporary. The reference is bound to 4652 // the temporary or to a sub-object within the 4653 // temporary. 4654 // 4655 // The constructor that would be used to make the copy 4656 // shall be callable whether or not the copy is actually 4657 // done. 4658 // 4659 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4660 // freedom, so we will always take the first option and never build 4661 // a temporary in this case. FIXME: We will, however, have to check 4662 // for the presence of a copy constructor in C++98/03 mode. 4663 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4664 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4665 if (ICS) { 4666 ICS->setStandard(); 4667 ICS->Standard.First = ICK_Identity; 4668 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4669 ICS->Standard.Third = ICK_Identity; 4670 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4671 ICS->Standard.setToType(0, T2); 4672 ICS->Standard.setToType(1, T1); 4673 ICS->Standard.setToType(2, T1); 4674 ICS->Standard.ReferenceBinding = true; 4675 ICS->Standard.DirectBinding = false; 4676 ICS->Standard.RRefBinding = isRValRef; 4677 ICS->Standard.CopyConstructor = 0; 4678 } else { 4679 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4680 if (DerivedToBase) 4681 CK = CastExpr::CK_DerivedToBase; 4682 else if(CheckExceptionSpecCompatibility(Init, T1)) 4683 return true; 4684 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4685 } 4686 return false; 4687 } 4688 4689 // -- Otherwise, a temporary of type "cv1 T1" is created and 4690 // initialized from the initializer expression using the 4691 // rules for a non-reference copy initialization (8.5). The 4692 // reference is then bound to the temporary. If T1 is 4693 // reference-related to T2, cv1 must be the same 4694 // cv-qualification as, or greater cv-qualification than, 4695 // cv2; otherwise, the program is ill-formed. 4696 if (RefRelationship == Ref_Related) { 4697 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4698 // we would be reference-compatible or reference-compatible with 4699 // added qualification. But that wasn't the case, so the reference 4700 // initialization fails. 4701 if (!ICS) 4702 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4703 << T1 << int(InitLvalue != Expr::LV_Valid) 4704 << T2 << Init->getSourceRange(); 4705 return true; 4706 } 4707 4708 // If at least one of the types is a class type, the types are not 4709 // related, and we aren't allowed any user conversions, the 4710 // reference binding fails. This case is important for breaking 4711 // recursion, since TryImplicitConversion below will attempt to 4712 // create a temporary through the use of a copy constructor. 4713 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4714 (T1->isRecordType() || T2->isRecordType())) { 4715 if (!ICS) 4716 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4717 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4718 return true; 4719 } 4720 4721 // Actually try to convert the initializer to T1. 4722 if (ICS) { 4723 // C++ [over.ics.ref]p2: 4724 // 4725 // When a parameter of reference type is not bound directly to 4726 // an argument expression, the conversion sequence is the one 4727 // required to convert the argument expression to the 4728 // underlying type of the reference according to 4729 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4730 // to copy-initializing a temporary of the underlying type with 4731 // the argument expression. Any difference in top-level 4732 // cv-qualification is subsumed by the initialization itself 4733 // and does not constitute a conversion. 4734 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4735 /*AllowExplicit=*/false, 4736 /*ForceRValue=*/false, 4737 /*InOverloadResolution=*/false); 4738 4739 // Of course, that's still a reference binding. 4740 if (ICS->isStandard()) { 4741 ICS->Standard.ReferenceBinding = true; 4742 ICS->Standard.RRefBinding = isRValRef; 4743 } else if (ICS->isUserDefined()) { 4744 ICS->UserDefined.After.ReferenceBinding = true; 4745 ICS->UserDefined.After.RRefBinding = isRValRef; 4746 } 4747 return ICS->isBad(); 4748 } else { 4749 ImplicitConversionSequence Conversions; 4750 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4751 false, false, 4752 Conversions); 4753 if (badConversion) { 4754 if (Conversions.isAmbiguous()) { 4755 Diag(DeclLoc, 4756 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4757 for (int j = Conversions.Ambiguous.conversions().size()-1; 4758 j >= 0; j--) { 4759 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4760 NoteOverloadCandidate(Func); 4761 } 4762 } 4763 else { 4764 if (isRValRef) 4765 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4766 << Init->getSourceRange(); 4767 else 4768 Diag(DeclLoc, diag::err_invalid_initialization) 4769 << DeclType << Init->getType() << Init->getSourceRange(); 4770 } 4771 } 4772 return badConversion; 4773 } 4774} 4775 4776static inline bool 4777CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4778 const FunctionDecl *FnDecl) { 4779 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4780 if (isa<NamespaceDecl>(DC)) { 4781 return SemaRef.Diag(FnDecl->getLocation(), 4782 diag::err_operator_new_delete_declared_in_namespace) 4783 << FnDecl->getDeclName(); 4784 } 4785 4786 if (isa<TranslationUnitDecl>(DC) && 4787 FnDecl->getStorageClass() == FunctionDecl::Static) { 4788 return SemaRef.Diag(FnDecl->getLocation(), 4789 diag::err_operator_new_delete_declared_static) 4790 << FnDecl->getDeclName(); 4791 } 4792 4793 return false; 4794} 4795 4796static inline bool 4797CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4798 CanQualType ExpectedResultType, 4799 CanQualType ExpectedFirstParamType, 4800 unsigned DependentParamTypeDiag, 4801 unsigned InvalidParamTypeDiag) { 4802 QualType ResultType = 4803 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4804 4805 // Check that the result type is not dependent. 4806 if (ResultType->isDependentType()) 4807 return SemaRef.Diag(FnDecl->getLocation(), 4808 diag::err_operator_new_delete_dependent_result_type) 4809 << FnDecl->getDeclName() << ExpectedResultType; 4810 4811 // Check that the result type is what we expect. 4812 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4813 return SemaRef.Diag(FnDecl->getLocation(), 4814 diag::err_operator_new_delete_invalid_result_type) 4815 << FnDecl->getDeclName() << ExpectedResultType; 4816 4817 // A function template must have at least 2 parameters. 4818 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4819 return SemaRef.Diag(FnDecl->getLocation(), 4820 diag::err_operator_new_delete_template_too_few_parameters) 4821 << FnDecl->getDeclName(); 4822 4823 // The function decl must have at least 1 parameter. 4824 if (FnDecl->getNumParams() == 0) 4825 return SemaRef.Diag(FnDecl->getLocation(), 4826 diag::err_operator_new_delete_too_few_parameters) 4827 << FnDecl->getDeclName(); 4828 4829 // Check the the first parameter type is not dependent. 4830 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4831 if (FirstParamType->isDependentType()) 4832 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4833 << FnDecl->getDeclName() << ExpectedFirstParamType; 4834 4835 // Check that the first parameter type is what we expect. 4836 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4837 ExpectedFirstParamType) 4838 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4839 << FnDecl->getDeclName() << ExpectedFirstParamType; 4840 4841 return false; 4842} 4843 4844static bool 4845CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4846 // C++ [basic.stc.dynamic.allocation]p1: 4847 // A program is ill-formed if an allocation function is declared in a 4848 // namespace scope other than global scope or declared static in global 4849 // scope. 4850 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4851 return true; 4852 4853 CanQualType SizeTy = 4854 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4855 4856 // C++ [basic.stc.dynamic.allocation]p1: 4857 // The return type shall be void*. The first parameter shall have type 4858 // std::size_t. 4859 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4860 SizeTy, 4861 diag::err_operator_new_dependent_param_type, 4862 diag::err_operator_new_param_type)) 4863 return true; 4864 4865 // C++ [basic.stc.dynamic.allocation]p1: 4866 // The first parameter shall not have an associated default argument. 4867 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4868 return SemaRef.Diag(FnDecl->getLocation(), 4869 diag::err_operator_new_default_arg) 4870 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4871 4872 return false; 4873} 4874 4875static bool 4876CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4877 // C++ [basic.stc.dynamic.deallocation]p1: 4878 // A program is ill-formed if deallocation functions are declared in a 4879 // namespace scope other than global scope or declared static in global 4880 // scope. 4881 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4882 return true; 4883 4884 // C++ [basic.stc.dynamic.deallocation]p2: 4885 // Each deallocation function shall return void and its first parameter 4886 // shall be void*. 4887 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4888 SemaRef.Context.VoidPtrTy, 4889 diag::err_operator_delete_dependent_param_type, 4890 diag::err_operator_delete_param_type)) 4891 return true; 4892 4893 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4894 if (FirstParamType->isDependentType()) 4895 return SemaRef.Diag(FnDecl->getLocation(), 4896 diag::err_operator_delete_dependent_param_type) 4897 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4898 4899 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4900 SemaRef.Context.VoidPtrTy) 4901 return SemaRef.Diag(FnDecl->getLocation(), 4902 diag::err_operator_delete_param_type) 4903 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4904 4905 return false; 4906} 4907 4908/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4909/// of this overloaded operator is well-formed. If so, returns false; 4910/// otherwise, emits appropriate diagnostics and returns true. 4911bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4912 assert(FnDecl && FnDecl->isOverloadedOperator() && 4913 "Expected an overloaded operator declaration"); 4914 4915 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4916 4917 // C++ [over.oper]p5: 4918 // The allocation and deallocation functions, operator new, 4919 // operator new[], operator delete and operator delete[], are 4920 // described completely in 3.7.3. The attributes and restrictions 4921 // found in the rest of this subclause do not apply to them unless 4922 // explicitly stated in 3.7.3. 4923 if (Op == OO_Delete || Op == OO_Array_Delete) 4924 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4925 4926 if (Op == OO_New || Op == OO_Array_New) 4927 return CheckOperatorNewDeclaration(*this, FnDecl); 4928 4929 // C++ [over.oper]p6: 4930 // An operator function shall either be a non-static member 4931 // function or be a non-member function and have at least one 4932 // parameter whose type is a class, a reference to a class, an 4933 // enumeration, or a reference to an enumeration. 4934 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4935 if (MethodDecl->isStatic()) 4936 return Diag(FnDecl->getLocation(), 4937 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4938 } else { 4939 bool ClassOrEnumParam = false; 4940 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4941 ParamEnd = FnDecl->param_end(); 4942 Param != ParamEnd; ++Param) { 4943 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4944 if (ParamType->isDependentType() || ParamType->isRecordType() || 4945 ParamType->isEnumeralType()) { 4946 ClassOrEnumParam = true; 4947 break; 4948 } 4949 } 4950 4951 if (!ClassOrEnumParam) 4952 return Diag(FnDecl->getLocation(), 4953 diag::err_operator_overload_needs_class_or_enum) 4954 << FnDecl->getDeclName(); 4955 } 4956 4957 // C++ [over.oper]p8: 4958 // An operator function cannot have default arguments (8.3.6), 4959 // except where explicitly stated below. 4960 // 4961 // Only the function-call operator allows default arguments 4962 // (C++ [over.call]p1). 4963 if (Op != OO_Call) { 4964 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4965 Param != FnDecl->param_end(); ++Param) { 4966 if ((*Param)->hasDefaultArg()) 4967 return Diag((*Param)->getLocation(), 4968 diag::err_operator_overload_default_arg) 4969 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4970 } 4971 } 4972 4973 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4974 { false, false, false } 4975#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4976 , { Unary, Binary, MemberOnly } 4977#include "clang/Basic/OperatorKinds.def" 4978 }; 4979 4980 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4981 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4982 bool MustBeMemberOperator = OperatorUses[Op][2]; 4983 4984 // C++ [over.oper]p8: 4985 // [...] Operator functions cannot have more or fewer parameters 4986 // than the number required for the corresponding operator, as 4987 // described in the rest of this subclause. 4988 unsigned NumParams = FnDecl->getNumParams() 4989 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4990 if (Op != OO_Call && 4991 ((NumParams == 1 && !CanBeUnaryOperator) || 4992 (NumParams == 2 && !CanBeBinaryOperator) || 4993 (NumParams < 1) || (NumParams > 2))) { 4994 // We have the wrong number of parameters. 4995 unsigned ErrorKind; 4996 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4997 ErrorKind = 2; // 2 -> unary or binary. 4998 } else if (CanBeUnaryOperator) { 4999 ErrorKind = 0; // 0 -> unary 5000 } else { 5001 assert(CanBeBinaryOperator && 5002 "All non-call overloaded operators are unary or binary!"); 5003 ErrorKind = 1; // 1 -> binary 5004 } 5005 5006 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5007 << FnDecl->getDeclName() << NumParams << ErrorKind; 5008 } 5009 5010 // Overloaded operators other than operator() cannot be variadic. 5011 if (Op != OO_Call && 5012 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5013 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5014 << FnDecl->getDeclName(); 5015 } 5016 5017 // Some operators must be non-static member functions. 5018 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5019 return Diag(FnDecl->getLocation(), 5020 diag::err_operator_overload_must_be_member) 5021 << FnDecl->getDeclName(); 5022 } 5023 5024 // C++ [over.inc]p1: 5025 // The user-defined function called operator++ implements the 5026 // prefix and postfix ++ operator. If this function is a member 5027 // function with no parameters, or a non-member function with one 5028 // parameter of class or enumeration type, it defines the prefix 5029 // increment operator ++ for objects of that type. If the function 5030 // is a member function with one parameter (which shall be of type 5031 // int) or a non-member function with two parameters (the second 5032 // of which shall be of type int), it defines the postfix 5033 // increment operator ++ for objects of that type. 5034 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5035 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5036 bool ParamIsInt = false; 5037 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5038 ParamIsInt = BT->getKind() == BuiltinType::Int; 5039 5040 if (!ParamIsInt) 5041 return Diag(LastParam->getLocation(), 5042 diag::err_operator_overload_post_incdec_must_be_int) 5043 << LastParam->getType() << (Op == OO_MinusMinus); 5044 } 5045 5046 // Notify the class if it got an assignment operator. 5047 if (Op == OO_Equal) { 5048 // Would have returned earlier otherwise. 5049 assert(isa<CXXMethodDecl>(FnDecl) && 5050 "Overloaded = not member, but not filtered."); 5051 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5052 Method->getParent()->addedAssignmentOperator(Context, Method); 5053 } 5054 5055 return false; 5056} 5057 5058/// CheckLiteralOperatorDeclaration - Check whether the declaration 5059/// of this literal operator function is well-formed. If so, returns 5060/// false; otherwise, emits appropriate diagnostics and returns true. 5061bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5062 DeclContext *DC = FnDecl->getDeclContext(); 5063 Decl::Kind Kind = DC->getDeclKind(); 5064 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5065 Kind != Decl::LinkageSpec) { 5066 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5067 << FnDecl->getDeclName(); 5068 return true; 5069 } 5070 5071 bool Valid = false; 5072 5073 // FIXME: Check for the one valid template signature 5074 // template <char...> type operator "" name(); 5075 5076 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5077 // Check the first parameter 5078 QualType T = (*Param)->getType(); 5079 5080 // unsigned long long int and long double are allowed, but only 5081 // alone. 5082 // We also allow any character type; their omission seems to be a bug 5083 // in n3000 5084 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5085 Context.hasSameType(T, Context.LongDoubleTy) || 5086 Context.hasSameType(T, Context.CharTy) || 5087 Context.hasSameType(T, Context.WCharTy) || 5088 Context.hasSameType(T, Context.Char16Ty) || 5089 Context.hasSameType(T, Context.Char32Ty)) { 5090 if (++Param == FnDecl->param_end()) 5091 Valid = true; 5092 goto FinishedParams; 5093 } 5094 5095 // Otherwise it must be a pointer to const; let's strip those. 5096 const PointerType *PT = T->getAs<PointerType>(); 5097 if (!PT) 5098 goto FinishedParams; 5099 T = PT->getPointeeType(); 5100 if (!T.isConstQualified()) 5101 goto FinishedParams; 5102 T = T.getUnqualifiedType(); 5103 5104 // Move on to the second parameter; 5105 ++Param; 5106 5107 // If there is no second parameter, the first must be a const char * 5108 if (Param == FnDecl->param_end()) { 5109 if (Context.hasSameType(T, Context.CharTy)) 5110 Valid = true; 5111 goto FinishedParams; 5112 } 5113 5114 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5115 // are allowed as the first parameter to a two-parameter function 5116 if (!(Context.hasSameType(T, Context.CharTy) || 5117 Context.hasSameType(T, Context.WCharTy) || 5118 Context.hasSameType(T, Context.Char16Ty) || 5119 Context.hasSameType(T, Context.Char32Ty))) 5120 goto FinishedParams; 5121 5122 // The second and final parameter must be an std::size_t 5123 T = (*Param)->getType().getUnqualifiedType(); 5124 if (Context.hasSameType(T, Context.getSizeType()) && 5125 ++Param == FnDecl->param_end()) 5126 Valid = true; 5127 } 5128 5129 // FIXME: This diagnostic is absolutely terrible. 5130FinishedParams: 5131 if (!Valid) { 5132 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5133 << FnDecl->getDeclName(); 5134 return true; 5135 } 5136 5137 return false; 5138} 5139 5140/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5141/// linkage specification, including the language and (if present) 5142/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5143/// the location of the language string literal, which is provided 5144/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5145/// the '{' brace. Otherwise, this linkage specification does not 5146/// have any braces. 5147Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5148 SourceLocation ExternLoc, 5149 SourceLocation LangLoc, 5150 const char *Lang, 5151 unsigned StrSize, 5152 SourceLocation LBraceLoc) { 5153 LinkageSpecDecl::LanguageIDs Language; 5154 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5155 Language = LinkageSpecDecl::lang_c; 5156 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5157 Language = LinkageSpecDecl::lang_cxx; 5158 else { 5159 Diag(LangLoc, diag::err_bad_language); 5160 return DeclPtrTy(); 5161 } 5162 5163 // FIXME: Add all the various semantics of linkage specifications 5164 5165 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5166 LangLoc, Language, 5167 LBraceLoc.isValid()); 5168 CurContext->addDecl(D); 5169 PushDeclContext(S, D); 5170 return DeclPtrTy::make(D); 5171} 5172 5173/// ActOnFinishLinkageSpecification - Completely the definition of 5174/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5175/// valid, it's the position of the closing '}' brace in a linkage 5176/// specification that uses braces. 5177Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5178 DeclPtrTy LinkageSpec, 5179 SourceLocation RBraceLoc) { 5180 if (LinkageSpec) 5181 PopDeclContext(); 5182 return LinkageSpec; 5183} 5184 5185/// \brief Perform semantic analysis for the variable declaration that 5186/// occurs within a C++ catch clause, returning the newly-created 5187/// variable. 5188VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5189 TypeSourceInfo *TInfo, 5190 IdentifierInfo *Name, 5191 SourceLocation Loc, 5192 SourceRange Range) { 5193 bool Invalid = false; 5194 5195 // Arrays and functions decay. 5196 if (ExDeclType->isArrayType()) 5197 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5198 else if (ExDeclType->isFunctionType()) 5199 ExDeclType = Context.getPointerType(ExDeclType); 5200 5201 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5202 // The exception-declaration shall not denote a pointer or reference to an 5203 // incomplete type, other than [cv] void*. 5204 // N2844 forbids rvalue references. 5205 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5206 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5207 Invalid = true; 5208 } 5209 5210 // GCC allows catching pointers and references to incomplete types 5211 // as an extension; so do we, but we warn by default. 5212 5213 QualType BaseType = ExDeclType; 5214 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5215 unsigned DK = diag::err_catch_incomplete; 5216 bool IncompleteCatchIsInvalid = true; 5217 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5218 BaseType = Ptr->getPointeeType(); 5219 Mode = 1; 5220 DK = diag::ext_catch_incomplete_ptr; 5221 IncompleteCatchIsInvalid = false; 5222 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5223 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5224 BaseType = Ref->getPointeeType(); 5225 Mode = 2; 5226 DK = diag::ext_catch_incomplete_ref; 5227 IncompleteCatchIsInvalid = false; 5228 } 5229 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5230 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5231 IncompleteCatchIsInvalid) 5232 Invalid = true; 5233 5234 if (!Invalid && !ExDeclType->isDependentType() && 5235 RequireNonAbstractType(Loc, ExDeclType, 5236 diag::err_abstract_type_in_decl, 5237 AbstractVariableType)) 5238 Invalid = true; 5239 5240 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5241 Name, ExDeclType, TInfo, VarDecl::None); 5242 5243 if (!Invalid) { 5244 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5245 // C++ [except.handle]p16: 5246 // The object declared in an exception-declaration or, if the 5247 // exception-declaration does not specify a name, a temporary (12.2) is 5248 // copy-initialized (8.5) from the exception object. [...] 5249 // The object is destroyed when the handler exits, after the destruction 5250 // of any automatic objects initialized within the handler. 5251 // 5252 // We just pretend to initialize the object with itself, then make sure 5253 // it can be destroyed later. 5254 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5255 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5256 Loc, ExDeclType, 0); 5257 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5258 SourceLocation()); 5259 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5260 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5261 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5262 if (Result.isInvalid()) 5263 Invalid = true; 5264 else 5265 FinalizeVarWithDestructor(ExDecl, RecordTy); 5266 } 5267 } 5268 5269 if (Invalid) 5270 ExDecl->setInvalidDecl(); 5271 5272 return ExDecl; 5273} 5274 5275/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5276/// handler. 5277Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5278 TypeSourceInfo *TInfo = 0; 5279 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5280 5281 bool Invalid = D.isInvalidType(); 5282 IdentifierInfo *II = D.getIdentifier(); 5283 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5284 // The scope should be freshly made just for us. There is just no way 5285 // it contains any previous declaration. 5286 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5287 if (PrevDecl->isTemplateParameter()) { 5288 // Maybe we will complain about the shadowed template parameter. 5289 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5290 } 5291 } 5292 5293 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5294 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5295 << D.getCXXScopeSpec().getRange(); 5296 Invalid = true; 5297 } 5298 5299 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5300 D.getIdentifier(), 5301 D.getIdentifierLoc(), 5302 D.getDeclSpec().getSourceRange()); 5303 5304 if (Invalid) 5305 ExDecl->setInvalidDecl(); 5306 5307 // Add the exception declaration into this scope. 5308 if (II) 5309 PushOnScopeChains(ExDecl, S); 5310 else 5311 CurContext->addDecl(ExDecl); 5312 5313 ProcessDeclAttributes(S, ExDecl, D); 5314 return DeclPtrTy::make(ExDecl); 5315} 5316 5317Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5318 ExprArg assertexpr, 5319 ExprArg assertmessageexpr) { 5320 Expr *AssertExpr = (Expr *)assertexpr.get(); 5321 StringLiteral *AssertMessage = 5322 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5323 5324 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5325 llvm::APSInt Value(32); 5326 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5327 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5328 AssertExpr->getSourceRange(); 5329 return DeclPtrTy(); 5330 } 5331 5332 if (Value == 0) { 5333 Diag(AssertLoc, diag::err_static_assert_failed) 5334 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5335 } 5336 } 5337 5338 assertexpr.release(); 5339 assertmessageexpr.release(); 5340 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5341 AssertExpr, AssertMessage); 5342 5343 CurContext->addDecl(Decl); 5344 return DeclPtrTy::make(Decl); 5345} 5346 5347/// Handle a friend type declaration. This works in tandem with 5348/// ActOnTag. 5349/// 5350/// Notes on friend class templates: 5351/// 5352/// We generally treat friend class declarations as if they were 5353/// declaring a class. So, for example, the elaborated type specifier 5354/// in a friend declaration is required to obey the restrictions of a 5355/// class-head (i.e. no typedefs in the scope chain), template 5356/// parameters are required to match up with simple template-ids, &c. 5357/// However, unlike when declaring a template specialization, it's 5358/// okay to refer to a template specialization without an empty 5359/// template parameter declaration, e.g. 5360/// friend class A<T>::B<unsigned>; 5361/// We permit this as a special case; if there are any template 5362/// parameters present at all, require proper matching, i.e. 5363/// template <> template <class T> friend class A<int>::B; 5364Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5365 MultiTemplateParamsArg TempParams) { 5366 SourceLocation Loc = DS.getSourceRange().getBegin(); 5367 5368 assert(DS.isFriendSpecified()); 5369 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5370 5371 // Try to convert the decl specifier to a type. This works for 5372 // friend templates because ActOnTag never produces a ClassTemplateDecl 5373 // for a TUK_Friend. 5374 Declarator TheDeclarator(DS, Declarator::MemberContext); 5375 TypeSourceInfo *TSI; 5376 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5377 if (TheDeclarator.isInvalidType()) 5378 return DeclPtrTy(); 5379 5380 // This is definitely an error in C++98. It's probably meant to 5381 // be forbidden in C++0x, too, but the specification is just 5382 // poorly written. 5383 // 5384 // The problem is with declarations like the following: 5385 // template <T> friend A<T>::foo; 5386 // where deciding whether a class C is a friend or not now hinges 5387 // on whether there exists an instantiation of A that causes 5388 // 'foo' to equal C. There are restrictions on class-heads 5389 // (which we declare (by fiat) elaborated friend declarations to 5390 // be) that makes this tractable. 5391 // 5392 // FIXME: handle "template <> friend class A<T>;", which 5393 // is possibly well-formed? Who even knows? 5394 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5395 Diag(Loc, diag::err_tagless_friend_type_template) 5396 << DS.getSourceRange(); 5397 return DeclPtrTy(); 5398 } 5399 5400 // C++ [class.friend]p2: 5401 // An elaborated-type-specifier shall be used in a friend declaration 5402 // for a class.* 5403 // * The class-key of the elaborated-type-specifier is required. 5404 // This is one of the rare places in Clang where it's legitimate to 5405 // ask about the "spelling" of the type. 5406 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5407 // If we evaluated the type to a record type, suggest putting 5408 // a tag in front. 5409 if (const RecordType *RT = T->getAs<RecordType>()) { 5410 RecordDecl *RD = RT->getDecl(); 5411 5412 std::string InsertionText = std::string(" ") + RD->getKindName(); 5413 5414 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5415 << (unsigned) RD->getTagKind() 5416 << T 5417 << SourceRange(DS.getFriendSpecLoc()) 5418 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5419 InsertionText); 5420 return DeclPtrTy(); 5421 }else { 5422 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5423 << DS.getSourceRange(); 5424 return DeclPtrTy(); 5425 } 5426 } 5427 5428 // Enum types cannot be friends. 5429 if (T->getAs<EnumType>()) { 5430 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5431 << SourceRange(DS.getFriendSpecLoc()); 5432 return DeclPtrTy(); 5433 } 5434 5435 // C++98 [class.friend]p1: A friend of a class is a function 5436 // or class that is not a member of the class . . . 5437 // This is fixed in DR77, which just barely didn't make the C++03 5438 // deadline. It's also a very silly restriction that seriously 5439 // affects inner classes and which nobody else seems to implement; 5440 // thus we never diagnose it, not even in -pedantic. 5441 // 5442 // But note that we could warn about it: it's always useless to 5443 // friend one of your own members (it's not, however, worthless to 5444 // friend a member of an arbitrary specialization of your template). 5445 5446 Decl *D; 5447 if (TempParams.size()) 5448 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5449 TempParams.size(), 5450 (TemplateParameterList**) TempParams.release(), 5451 TSI, 5452 DS.getFriendSpecLoc()); 5453 else 5454 D = FriendDecl::Create(Context, CurContext, Loc, TSI, 5455 DS.getFriendSpecLoc()); 5456 D->setAccess(AS_public); 5457 CurContext->addDecl(D); 5458 5459 return DeclPtrTy::make(D); 5460} 5461 5462Sema::DeclPtrTy 5463Sema::ActOnFriendFunctionDecl(Scope *S, 5464 Declarator &D, 5465 bool IsDefinition, 5466 MultiTemplateParamsArg TemplateParams) { 5467 const DeclSpec &DS = D.getDeclSpec(); 5468 5469 assert(DS.isFriendSpecified()); 5470 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5471 5472 SourceLocation Loc = D.getIdentifierLoc(); 5473 TypeSourceInfo *TInfo = 0; 5474 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5475 5476 // C++ [class.friend]p1 5477 // A friend of a class is a function or class.... 5478 // Note that this sees through typedefs, which is intended. 5479 // It *doesn't* see through dependent types, which is correct 5480 // according to [temp.arg.type]p3: 5481 // If a declaration acquires a function type through a 5482 // type dependent on a template-parameter and this causes 5483 // a declaration that does not use the syntactic form of a 5484 // function declarator to have a function type, the program 5485 // is ill-formed. 5486 if (!T->isFunctionType()) { 5487 Diag(Loc, diag::err_unexpected_friend); 5488 5489 // It might be worthwhile to try to recover by creating an 5490 // appropriate declaration. 5491 return DeclPtrTy(); 5492 } 5493 5494 // C++ [namespace.memdef]p3 5495 // - If a friend declaration in a non-local class first declares a 5496 // class or function, the friend class or function is a member 5497 // of the innermost enclosing namespace. 5498 // - The name of the friend is not found by simple name lookup 5499 // until a matching declaration is provided in that namespace 5500 // scope (either before or after the class declaration granting 5501 // friendship). 5502 // - If a friend function is called, its name may be found by the 5503 // name lookup that considers functions from namespaces and 5504 // classes associated with the types of the function arguments. 5505 // - When looking for a prior declaration of a class or a function 5506 // declared as a friend, scopes outside the innermost enclosing 5507 // namespace scope are not considered. 5508 5509 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5510 DeclarationName Name = GetNameForDeclarator(D); 5511 assert(Name); 5512 5513 // The context we found the declaration in, or in which we should 5514 // create the declaration. 5515 DeclContext *DC; 5516 5517 // FIXME: handle local classes 5518 5519 // Recover from invalid scope qualifiers as if they just weren't there. 5520 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5521 ForRedeclaration); 5522 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5523 // FIXME: RequireCompleteDeclContext 5524 DC = computeDeclContext(ScopeQual); 5525 5526 // FIXME: handle dependent contexts 5527 if (!DC) return DeclPtrTy(); 5528 5529 LookupQualifiedName(Previous, DC); 5530 5531 // If searching in that context implicitly found a declaration in 5532 // a different context, treat it like it wasn't found at all. 5533 // TODO: better diagnostics for this case. Suggesting the right 5534 // qualified scope would be nice... 5535 // FIXME: getRepresentativeDecl() is not right here at all 5536 if (Previous.empty() || 5537 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5538 D.setInvalidType(); 5539 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5540 return DeclPtrTy(); 5541 } 5542 5543 // C++ [class.friend]p1: A friend of a class is a function or 5544 // class that is not a member of the class . . . 5545 if (DC->Equals(CurContext)) 5546 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5547 5548 // Otherwise walk out to the nearest namespace scope looking for matches. 5549 } else { 5550 // TODO: handle local class contexts. 5551 5552 DC = CurContext; 5553 while (true) { 5554 // Skip class contexts. If someone can cite chapter and verse 5555 // for this behavior, that would be nice --- it's what GCC and 5556 // EDG do, and it seems like a reasonable intent, but the spec 5557 // really only says that checks for unqualified existing 5558 // declarations should stop at the nearest enclosing namespace, 5559 // not that they should only consider the nearest enclosing 5560 // namespace. 5561 while (DC->isRecord()) 5562 DC = DC->getParent(); 5563 5564 LookupQualifiedName(Previous, DC); 5565 5566 // TODO: decide what we think about using declarations. 5567 if (!Previous.empty()) 5568 break; 5569 5570 if (DC->isFileContext()) break; 5571 DC = DC->getParent(); 5572 } 5573 5574 // C++ [class.friend]p1: A friend of a class is a function or 5575 // class that is not a member of the class . . . 5576 // C++0x changes this for both friend types and functions. 5577 // Most C++ 98 compilers do seem to give an error here, so 5578 // we do, too. 5579 if (!Previous.empty() && DC->Equals(CurContext) 5580 && !getLangOptions().CPlusPlus0x) 5581 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5582 } 5583 5584 if (DC->isFileContext()) { 5585 // This implies that it has to be an operator or function. 5586 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5587 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5588 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5589 Diag(Loc, diag::err_introducing_special_friend) << 5590 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5591 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5592 return DeclPtrTy(); 5593 } 5594 } 5595 5596 bool Redeclaration = false; 5597 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5598 move(TemplateParams), 5599 IsDefinition, 5600 Redeclaration); 5601 if (!ND) return DeclPtrTy(); 5602 5603 assert(ND->getDeclContext() == DC); 5604 assert(ND->getLexicalDeclContext() == CurContext); 5605 5606 // Add the function declaration to the appropriate lookup tables, 5607 // adjusting the redeclarations list as necessary. We don't 5608 // want to do this yet if the friending class is dependent. 5609 // 5610 // Also update the scope-based lookup if the target context's 5611 // lookup context is in lexical scope. 5612 if (!CurContext->isDependentContext()) { 5613 DC = DC->getLookupContext(); 5614 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5615 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5616 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5617 } 5618 5619 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5620 D.getIdentifierLoc(), ND, 5621 DS.getFriendSpecLoc()); 5622 FrD->setAccess(AS_public); 5623 CurContext->addDecl(FrD); 5624 5625 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5626 FrD->setSpecialization(true); 5627 5628 return DeclPtrTy::make(ND); 5629} 5630 5631void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5632 AdjustDeclIfTemplate(dcl); 5633 5634 Decl *Dcl = dcl.getAs<Decl>(); 5635 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5636 if (!Fn) { 5637 Diag(DelLoc, diag::err_deleted_non_function); 5638 return; 5639 } 5640 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5641 Diag(DelLoc, diag::err_deleted_decl_not_first); 5642 Diag(Prev->getLocation(), diag::note_previous_declaration); 5643 // If the declaration wasn't the first, we delete the function anyway for 5644 // recovery. 5645 } 5646 Fn->setDeleted(); 5647} 5648 5649static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5650 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5651 ++CI) { 5652 Stmt *SubStmt = *CI; 5653 if (!SubStmt) 5654 continue; 5655 if (isa<ReturnStmt>(SubStmt)) 5656 Self.Diag(SubStmt->getSourceRange().getBegin(), 5657 diag::err_return_in_constructor_handler); 5658 if (!isa<Expr>(SubStmt)) 5659 SearchForReturnInStmt(Self, SubStmt); 5660 } 5661} 5662 5663void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5664 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5665 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5666 SearchForReturnInStmt(*this, Handler); 5667 } 5668} 5669 5670bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5671 const CXXMethodDecl *Old) { 5672 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5673 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5674 5675 if (Context.hasSameType(NewTy, OldTy) || 5676 NewTy->isDependentType() || OldTy->isDependentType()) 5677 return false; 5678 5679 // Check if the return types are covariant 5680 QualType NewClassTy, OldClassTy; 5681 5682 /// Both types must be pointers or references to classes. 5683 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5684 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5685 NewClassTy = NewPT->getPointeeType(); 5686 OldClassTy = OldPT->getPointeeType(); 5687 } 5688 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5689 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5690 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5691 NewClassTy = NewRT->getPointeeType(); 5692 OldClassTy = OldRT->getPointeeType(); 5693 } 5694 } 5695 } 5696 5697 // The return types aren't either both pointers or references to a class type. 5698 if (NewClassTy.isNull()) { 5699 Diag(New->getLocation(), 5700 diag::err_different_return_type_for_overriding_virtual_function) 5701 << New->getDeclName() << NewTy << OldTy; 5702 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5703 5704 return true; 5705 } 5706 5707 // C++ [class.virtual]p6: 5708 // If the return type of D::f differs from the return type of B::f, the 5709 // class type in the return type of D::f shall be complete at the point of 5710 // declaration of D::f or shall be the class type D. 5711 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5712 if (!RT->isBeingDefined() && 5713 RequireCompleteType(New->getLocation(), NewClassTy, 5714 PDiag(diag::err_covariant_return_incomplete) 5715 << New->getDeclName())) 5716 return true; 5717 } 5718 5719 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5720 // Check if the new class derives from the old class. 5721 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5722 Diag(New->getLocation(), 5723 diag::err_covariant_return_not_derived) 5724 << New->getDeclName() << NewTy << OldTy; 5725 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5726 return true; 5727 } 5728 5729 // Check if we the conversion from derived to base is valid. 5730 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5731 diag::err_covariant_return_inaccessible_base, 5732 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5733 // FIXME: Should this point to the return type? 5734 New->getLocation(), SourceRange(), New->getDeclName())) { 5735 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5736 return true; 5737 } 5738 } 5739 5740 // The qualifiers of the return types must be the same. 5741 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5742 Diag(New->getLocation(), 5743 diag::err_covariant_return_type_different_qualifications) 5744 << New->getDeclName() << NewTy << OldTy; 5745 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5746 return true; 5747 }; 5748 5749 5750 // The new class type must have the same or less qualifiers as the old type. 5751 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5752 Diag(New->getLocation(), 5753 diag::err_covariant_return_type_class_type_more_qualified) 5754 << New->getDeclName() << NewTy << OldTy; 5755 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5756 return true; 5757 }; 5758 5759 return false; 5760} 5761 5762bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5763 const CXXMethodDecl *Old) 5764{ 5765 if (Old->hasAttr<FinalAttr>()) { 5766 Diag(New->getLocation(), diag::err_final_function_overridden) 5767 << New->getDeclName(); 5768 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5769 return true; 5770 } 5771 5772 return false; 5773} 5774 5775/// \brief Mark the given method pure. 5776/// 5777/// \param Method the method to be marked pure. 5778/// 5779/// \param InitRange the source range that covers the "0" initializer. 5780bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5781 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5782 Method->setPure(); 5783 5784 // A class is abstract if at least one function is pure virtual. 5785 Method->getParent()->setAbstract(true); 5786 return false; 5787 } 5788 5789 if (!Method->isInvalidDecl()) 5790 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5791 << Method->getDeclName() << InitRange; 5792 return true; 5793} 5794 5795/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5796/// an initializer for the out-of-line declaration 'Dcl'. The scope 5797/// is a fresh scope pushed for just this purpose. 5798/// 5799/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5800/// static data member of class X, names should be looked up in the scope of 5801/// class X. 5802void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5803 // If there is no declaration, there was an error parsing it. 5804 Decl *D = Dcl.getAs<Decl>(); 5805 if (D == 0) return; 5806 5807 // We should only get called for declarations with scope specifiers, like: 5808 // int foo::bar; 5809 assert(D->isOutOfLine()); 5810 EnterDeclaratorContext(S, D->getDeclContext()); 5811} 5812 5813/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5814/// initializer for the out-of-line declaration 'Dcl'. 5815void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5816 // If there is no declaration, there was an error parsing it. 5817 Decl *D = Dcl.getAs<Decl>(); 5818 if (D == 0) return; 5819 5820 assert(D->isOutOfLine()); 5821 ExitDeclaratorContext(S); 5822} 5823 5824/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5825/// C++ if/switch/while/for statement. 5826/// e.g: "if (int x = f()) {...}" 5827Action::DeclResult 5828Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5829 // C++ 6.4p2: 5830 // The declarator shall not specify a function or an array. 5831 // The type-specifier-seq shall not contain typedef and shall not declare a 5832 // new class or enumeration. 5833 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5834 "Parser allowed 'typedef' as storage class of condition decl."); 5835 5836 TypeSourceInfo *TInfo = 0; 5837 TagDecl *OwnedTag = 0; 5838 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5839 5840 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5841 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5842 // would be created and CXXConditionDeclExpr wants a VarDecl. 5843 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5844 << D.getSourceRange(); 5845 return DeclResult(); 5846 } else if (OwnedTag && OwnedTag->isDefinition()) { 5847 // The type-specifier-seq shall not declare a new class or enumeration. 5848 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5849 } 5850 5851 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5852 if (!Dcl) 5853 return DeclResult(); 5854 5855 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5856 VD->setDeclaredInCondition(true); 5857 return Dcl; 5858} 5859 5860static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5861 // Ignore dependent types. 5862 if (MD->isDependentContext()) 5863 return false; 5864 5865 // Ignore declarations that are not definitions. 5866 if (!MD->isThisDeclarationADefinition()) 5867 return false; 5868 5869 CXXRecordDecl *RD = MD->getParent(); 5870 5871 // Ignore classes without a vtable. 5872 if (!RD->isDynamicClass()) 5873 return false; 5874 5875 switch (MD->getParent()->getTemplateSpecializationKind()) { 5876 case TSK_Undeclared: 5877 case TSK_ExplicitSpecialization: 5878 // Classes that aren't instantiations of templates don't need their 5879 // virtual methods marked until we see the definition of the key 5880 // function. 5881 break; 5882 5883 case TSK_ImplicitInstantiation: 5884 // This is a constructor of a class template; mark all of the virtual 5885 // members as referenced to ensure that they get instantiatied. 5886 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5887 return true; 5888 break; 5889 5890 case TSK_ExplicitInstantiationDeclaration: 5891 return false; 5892 5893 case TSK_ExplicitInstantiationDefinition: 5894 // This is method of a explicit instantiation; mark all of the virtual 5895 // members as referenced to ensure that they get instantiatied. 5896 return true; 5897 } 5898 5899 // Consider only out-of-line definitions of member functions. When we see 5900 // an inline definition, it's too early to compute the key function. 5901 if (!MD->isOutOfLine()) 5902 return false; 5903 5904 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5905 5906 // If there is no key function, we will need a copy of the vtable. 5907 if (!KeyFunction) 5908 return true; 5909 5910 // If this is the key function, we need to mark virtual members. 5911 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5912 return true; 5913 5914 return false; 5915} 5916 5917void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5918 CXXMethodDecl *MD) { 5919 CXXRecordDecl *RD = MD->getParent(); 5920 5921 // We will need to mark all of the virtual members as referenced to build the 5922 // vtable. 5923 if (!needsVtable(MD, Context)) 5924 return; 5925 5926 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5927 if (kind == TSK_ImplicitInstantiation) 5928 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5929 else 5930 MarkVirtualMembersReferenced(Loc, RD); 5931} 5932 5933bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5934 if (ClassesWithUnmarkedVirtualMembers.empty()) 5935 return false; 5936 5937 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5938 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5939 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5940 ClassesWithUnmarkedVirtualMembers.pop_back(); 5941 MarkVirtualMembersReferenced(Loc, RD); 5942 } 5943 5944 return true; 5945} 5946 5947void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5948 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5949 e = RD->method_end(); i != e; ++i) { 5950 CXXMethodDecl *MD = *i; 5951 5952 // C++ [basic.def.odr]p2: 5953 // [...] A virtual member function is used if it is not pure. [...] 5954 if (MD->isVirtual() && !MD->isPure()) 5955 MarkDeclarationReferenced(Loc, MD); 5956 } 5957} 5958