SemaDeclCXX.cpp revision 3c3ccdbe73cb43bdf39a9102f5f7eb842fb71952
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 // We don't want access-control diagnostics here. 1080 R.suppressDiagnostics(); 1081 1082 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1083 bool NotUnknownSpecialization = false; 1084 DeclContext *DC = computeDeclContext(SS, false); 1085 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1086 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1087 1088 if (!NotUnknownSpecialization) { 1089 // When the scope specifier can refer to a member of an unknown 1090 // specialization, we take it as a type name. 1091 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1092 *MemberOrBase, SS.getRange()); 1093 if (BaseType.isNull()) 1094 return true; 1095 1096 R.clear(); 1097 } 1098 } 1099 1100 // If no results were found, try to correct typos. 1101 if (R.empty() && BaseType.isNull() && 1102 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1103 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1104 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1105 // We have found a non-static data member with a similar 1106 // name to what was typed; complain and initialize that 1107 // member. 1108 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1109 << MemberOrBase << true << R.getLookupName() 1110 << FixItHint::CreateReplacement(R.getNameLoc(), 1111 R.getLookupName().getAsString()); 1112 Diag(Member->getLocation(), diag::note_previous_decl) 1113 << Member->getDeclName(); 1114 1115 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1116 LParenLoc, RParenLoc); 1117 } 1118 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1119 const CXXBaseSpecifier *DirectBaseSpec; 1120 const CXXBaseSpecifier *VirtualBaseSpec; 1121 if (FindBaseInitializer(*this, ClassDecl, 1122 Context.getTypeDeclType(Type), 1123 DirectBaseSpec, VirtualBaseSpec)) { 1124 // We have found a direct or virtual base class with a 1125 // similar name to what was typed; complain and initialize 1126 // that base class. 1127 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1128 << MemberOrBase << false << R.getLookupName() 1129 << FixItHint::CreateReplacement(R.getNameLoc(), 1130 R.getLookupName().getAsString()); 1131 1132 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1133 : VirtualBaseSpec; 1134 Diag(BaseSpec->getSourceRange().getBegin(), 1135 diag::note_base_class_specified_here) 1136 << BaseSpec->getType() 1137 << BaseSpec->getSourceRange(); 1138 1139 TyD = Type; 1140 } 1141 } 1142 } 1143 1144 if (!TyD && BaseType.isNull()) { 1145 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1146 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1147 return true; 1148 } 1149 } 1150 1151 if (BaseType.isNull()) { 1152 BaseType = Context.getTypeDeclType(TyD); 1153 if (SS.isSet()) { 1154 NestedNameSpecifier *Qualifier = 1155 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1156 1157 // FIXME: preserve source range information 1158 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1159 } 1160 } 1161 } 1162 1163 if (!TInfo) 1164 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1165 1166 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1167 LParenLoc, RParenLoc, ClassDecl); 1168} 1169 1170/// Checks an initializer expression for use of uninitialized fields, such as 1171/// containing the field that is being initialized. Returns true if there is an 1172/// uninitialized field was used an updates the SourceLocation parameter; false 1173/// otherwise. 1174static bool InitExprContainsUninitializedFields(const Stmt* S, 1175 const FieldDecl* LhsField, 1176 SourceLocation* L) { 1177 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1178 if (ME) { 1179 const NamedDecl* RhsField = ME->getMemberDecl(); 1180 if (RhsField == LhsField) { 1181 // Initializing a field with itself. Throw a warning. 1182 // But wait; there are exceptions! 1183 // Exception #1: The field may not belong to this record. 1184 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1185 const Expr* base = ME->getBase(); 1186 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1187 // Even though the field matches, it does not belong to this record. 1188 return false; 1189 } 1190 // None of the exceptions triggered; return true to indicate an 1191 // uninitialized field was used. 1192 *L = ME->getMemberLoc(); 1193 return true; 1194 } 1195 } 1196 bool found = false; 1197 for (Stmt::const_child_iterator it = S->child_begin(); 1198 it != S->child_end() && found == false; 1199 ++it) { 1200 if (isa<CallExpr>(S)) { 1201 // Do not descend into function calls or constructors, as the use 1202 // of an uninitialized field may be valid. One would have to inspect 1203 // the contents of the function/ctor to determine if it is safe or not. 1204 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1205 // may be safe, depending on what the function/ctor does. 1206 continue; 1207 } 1208 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1209 } 1210 return found; 1211} 1212 1213Sema::MemInitResult 1214Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1215 unsigned NumArgs, SourceLocation IdLoc, 1216 SourceLocation LParenLoc, 1217 SourceLocation RParenLoc) { 1218 // Diagnose value-uses of fields to initialize themselves, e.g. 1219 // foo(foo) 1220 // where foo is not also a parameter to the constructor. 1221 // TODO: implement -Wuninitialized and fold this into that framework. 1222 for (unsigned i = 0; i < NumArgs; ++i) { 1223 SourceLocation L; 1224 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1225 // FIXME: Return true in the case when other fields are used before being 1226 // uninitialized. For example, let this field be the i'th field. When 1227 // initializing the i'th field, throw a warning if any of the >= i'th 1228 // fields are used, as they are not yet initialized. 1229 // Right now we are only handling the case where the i'th field uses 1230 // itself in its initializer. 1231 Diag(L, diag::warn_field_is_uninit); 1232 } 1233 } 1234 1235 bool HasDependentArg = false; 1236 for (unsigned i = 0; i < NumArgs; i++) 1237 HasDependentArg |= Args[i]->isTypeDependent(); 1238 1239 QualType FieldType = Member->getType(); 1240 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1241 FieldType = Array->getElementType(); 1242 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1243 if (FieldType->isDependentType() || HasDependentArg) { 1244 // Can't check initialization for a member of dependent type or when 1245 // any of the arguments are type-dependent expressions. 1246 OwningExprResult Init 1247 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1248 RParenLoc)); 1249 1250 // Erase any temporaries within this evaluation context; we're not 1251 // going to track them in the AST, since we'll be rebuilding the 1252 // ASTs during template instantiation. 1253 ExprTemporaries.erase( 1254 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1255 ExprTemporaries.end()); 1256 1257 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1258 LParenLoc, 1259 Init.takeAs<Expr>(), 1260 RParenLoc); 1261 1262 } 1263 1264 if (Member->isInvalidDecl()) 1265 return true; 1266 1267 // Initialize the member. 1268 InitializedEntity MemberEntity = 1269 InitializedEntity::InitializeMember(Member, 0); 1270 InitializationKind Kind = 1271 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1272 1273 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1274 1275 OwningExprResult MemberInit = 1276 InitSeq.Perform(*this, MemberEntity, Kind, 1277 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1278 if (MemberInit.isInvalid()) 1279 return true; 1280 1281 // C++0x [class.base.init]p7: 1282 // The initialization of each base and member constitutes a 1283 // full-expression. 1284 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1285 if (MemberInit.isInvalid()) 1286 return true; 1287 1288 // If we are in a dependent context, template instantiation will 1289 // perform this type-checking again. Just save the arguments that we 1290 // received in a ParenListExpr. 1291 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1292 // of the information that we have about the member 1293 // initializer. However, deconstructing the ASTs is a dicey process, 1294 // and this approach is far more likely to get the corner cases right. 1295 if (CurContext->isDependentContext()) { 1296 // Bump the reference count of all of the arguments. 1297 for (unsigned I = 0; I != NumArgs; ++I) 1298 Args[I]->Retain(); 1299 1300 OwningExprResult Init 1301 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1302 RParenLoc)); 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init.takeAs<Expr>(), 1306 RParenLoc); 1307 } 1308 1309 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1310 LParenLoc, 1311 MemberInit.takeAs<Expr>(), 1312 RParenLoc); 1313} 1314 1315Sema::MemInitResult 1316Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1317 Expr **Args, unsigned NumArgs, 1318 SourceLocation LParenLoc, SourceLocation RParenLoc, 1319 CXXRecordDecl *ClassDecl) { 1320 bool HasDependentArg = false; 1321 for (unsigned i = 0; i < NumArgs; i++) 1322 HasDependentArg |= Args[i]->isTypeDependent(); 1323 1324 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1325 if (BaseType->isDependentType() || HasDependentArg) { 1326 // Can't check initialization for a base of dependent type or when 1327 // any of the arguments are type-dependent expressions. 1328 OwningExprResult BaseInit 1329 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1330 RParenLoc)); 1331 1332 // Erase any temporaries within this evaluation context; we're not 1333 // going to track them in the AST, since we'll be rebuilding the 1334 // ASTs during template instantiation. 1335 ExprTemporaries.erase( 1336 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1337 ExprTemporaries.end()); 1338 1339 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1340 LParenLoc, 1341 BaseInit.takeAs<Expr>(), 1342 RParenLoc); 1343 } 1344 1345 if (!BaseType->isRecordType()) 1346 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1347 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1348 1349 // C++ [class.base.init]p2: 1350 // [...] Unless the mem-initializer-id names a nonstatic data 1351 // member of the constructor’s class or a direct or virtual base 1352 // of that class, the mem-initializer is ill-formed. A 1353 // mem-initializer-list can initialize a base class using any 1354 // name that denotes that base class type. 1355 1356 // Check for direct and virtual base classes. 1357 const CXXBaseSpecifier *DirectBaseSpec = 0; 1358 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1359 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1360 VirtualBaseSpec); 1361 1362 // C++ [base.class.init]p2: 1363 // If a mem-initializer-id is ambiguous because it designates both 1364 // a direct non-virtual base class and an inherited virtual base 1365 // class, the mem-initializer is ill-formed. 1366 if (DirectBaseSpec && VirtualBaseSpec) 1367 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1368 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1369 // C++ [base.class.init]p2: 1370 // Unless the mem-initializer-id names a nonstatic data membeer of the 1371 // constructor's class ot a direst or virtual base of that class, the 1372 // mem-initializer is ill-formed. 1373 if (!DirectBaseSpec && !VirtualBaseSpec) 1374 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1375 << BaseType << ClassDecl->getNameAsCString() 1376 << BaseTInfo->getTypeLoc().getSourceRange(); 1377 1378 CXXBaseSpecifier *BaseSpec 1379 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1380 if (!BaseSpec) 1381 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1382 1383 // Initialize the base. 1384 InitializedEntity BaseEntity = 1385 InitializedEntity::InitializeBase(Context, BaseSpec); 1386 InitializationKind Kind = 1387 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1388 1389 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1390 1391 OwningExprResult BaseInit = 1392 InitSeq.Perform(*this, BaseEntity, Kind, 1393 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1394 if (BaseInit.isInvalid()) 1395 return true; 1396 1397 // C++0x [class.base.init]p7: 1398 // The initialization of each base and member constitutes a 1399 // full-expression. 1400 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1401 if (BaseInit.isInvalid()) 1402 return true; 1403 1404 // If we are in a dependent context, template instantiation will 1405 // perform this type-checking again. Just save the arguments that we 1406 // received in a ParenListExpr. 1407 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1408 // of the information that we have about the base 1409 // initializer. However, deconstructing the ASTs is a dicey process, 1410 // and this approach is far more likely to get the corner cases right. 1411 if (CurContext->isDependentContext()) { 1412 // Bump the reference count of all of the arguments. 1413 for (unsigned I = 0; I != NumArgs; ++I) 1414 Args[I]->Retain(); 1415 1416 OwningExprResult Init 1417 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1418 RParenLoc)); 1419 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1420 LParenLoc, 1421 Init.takeAs<Expr>(), 1422 RParenLoc); 1423 } 1424 1425 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1426 LParenLoc, 1427 BaseInit.takeAs<Expr>(), 1428 RParenLoc); 1429} 1430 1431bool 1432Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1433 CXXBaseOrMemberInitializer **Initializers, 1434 unsigned NumInitializers, 1435 bool AnyErrors) { 1436 if (Constructor->getDeclContext()->isDependentContext()) { 1437 // Just store the initializers as written, they will be checked during 1438 // instantiation. 1439 if (NumInitializers > 0) { 1440 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1441 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1442 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1443 memcpy(baseOrMemberInitializers, Initializers, 1444 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1445 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1446 } 1447 1448 return false; 1449 } 1450 1451 // We need to build the initializer AST according to order of construction 1452 // and not what user specified in the Initializers list. 1453 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1454 if (!ClassDecl) 1455 return true; 1456 1457 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1458 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1459 bool HadError = false; 1460 1461 for (unsigned i = 0; i < NumInitializers; i++) { 1462 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1463 1464 if (Member->isBaseInitializer()) 1465 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1466 else 1467 AllBaseFields[Member->getMember()] = Member; 1468 } 1469 1470 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1471 1472 // Push virtual bases before others. 1473 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1474 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1475 1476 if (CXXBaseOrMemberInitializer *Value 1477 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1478 AllToInit.push_back(Value); 1479 } else if (!AnyErrors) { 1480 InitializedEntity InitEntity 1481 = InitializedEntity::InitializeBase(Context, VBase); 1482 InitializationKind InitKind 1483 = InitializationKind::CreateDefault(Constructor->getLocation()); 1484 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1485 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1486 MultiExprArg(*this, 0, 0)); 1487 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1488 if (BaseInit.isInvalid()) { 1489 HadError = true; 1490 continue; 1491 } 1492 1493 CXXBaseOrMemberInitializer *CXXBaseInit = 1494 new (Context) CXXBaseOrMemberInitializer(Context, 1495 Context.getTrivialTypeSourceInfo(VBase->getType(), 1496 SourceLocation()), 1497 SourceLocation(), 1498 BaseInit.takeAs<Expr>(), 1499 SourceLocation()); 1500 AllToInit.push_back(CXXBaseInit); 1501 } 1502 } 1503 1504 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1505 E = ClassDecl->bases_end(); Base != E; ++Base) { 1506 // Virtuals are in the virtual base list and already constructed. 1507 if (Base->isVirtual()) 1508 continue; 1509 1510 if (CXXBaseOrMemberInitializer *Value 1511 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1512 AllToInit.push_back(Value); 1513 } else if (!AnyErrors) { 1514 InitializedEntity InitEntity 1515 = InitializedEntity::InitializeBase(Context, Base); 1516 InitializationKind InitKind 1517 = InitializationKind::CreateDefault(Constructor->getLocation()); 1518 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1519 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1520 MultiExprArg(*this, 0, 0)); 1521 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1522 if (BaseInit.isInvalid()) { 1523 HadError = true; 1524 continue; 1525 } 1526 1527 CXXBaseOrMemberInitializer *CXXBaseInit = 1528 new (Context) CXXBaseOrMemberInitializer(Context, 1529 Context.getTrivialTypeSourceInfo(Base->getType(), 1530 SourceLocation()), 1531 SourceLocation(), 1532 BaseInit.takeAs<Expr>(), 1533 SourceLocation()); 1534 AllToInit.push_back(CXXBaseInit); 1535 } 1536 } 1537 1538 // non-static data members. 1539 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1540 E = ClassDecl->field_end(); Field != E; ++Field) { 1541 if ((*Field)->isAnonymousStructOrUnion()) { 1542 if (const RecordType *FieldClassType = 1543 Field->getType()->getAs<RecordType>()) { 1544 CXXRecordDecl *FieldClassDecl 1545 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1546 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1547 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1548 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1549 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1550 // set to the anonymous union data member used in the initializer 1551 // list. 1552 Value->setMember(*Field); 1553 Value->setAnonUnionMember(*FA); 1554 AllToInit.push_back(Value); 1555 break; 1556 } 1557 } 1558 } 1559 continue; 1560 } 1561 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1562 AllToInit.push_back(Value); 1563 continue; 1564 } 1565 1566 if ((*Field)->getType()->isDependentType() || AnyErrors) 1567 continue; 1568 1569 QualType FT = Context.getBaseElementType((*Field)->getType()); 1570 if (FT->getAs<RecordType>()) { 1571 InitializedEntity InitEntity 1572 = InitializedEntity::InitializeMember(*Field); 1573 InitializationKind InitKind 1574 = InitializationKind::CreateDefault(Constructor->getLocation()); 1575 1576 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1577 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1578 MultiExprArg(*this, 0, 0)); 1579 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1580 if (MemberInit.isInvalid()) { 1581 HadError = true; 1582 continue; 1583 } 1584 1585 // Don't attach synthesized member initializers in a dependent 1586 // context; they'll be regenerated a template instantiation 1587 // time. 1588 if (CurContext->isDependentContext()) 1589 continue; 1590 1591 CXXBaseOrMemberInitializer *Member = 1592 new (Context) CXXBaseOrMemberInitializer(Context, 1593 *Field, SourceLocation(), 1594 SourceLocation(), 1595 MemberInit.takeAs<Expr>(), 1596 SourceLocation()); 1597 1598 AllToInit.push_back(Member); 1599 } 1600 else if (FT->isReferenceType()) { 1601 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1602 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1603 << 0 << (*Field)->getDeclName(); 1604 Diag((*Field)->getLocation(), diag::note_declared_at); 1605 HadError = true; 1606 } 1607 else if (FT.isConstQualified()) { 1608 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1609 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1610 << 1 << (*Field)->getDeclName(); 1611 Diag((*Field)->getLocation(), diag::note_declared_at); 1612 HadError = true; 1613 } 1614 } 1615 1616 NumInitializers = AllToInit.size(); 1617 if (NumInitializers > 0) { 1618 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1619 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1620 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1621 memcpy(baseOrMemberInitializers, AllToInit.data(), 1622 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1623 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1624 1625 // Constructors implicitly reference the base and member 1626 // destructors. 1627 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1628 Constructor->getParent()); 1629 } 1630 1631 return HadError; 1632} 1633 1634static void *GetKeyForTopLevelField(FieldDecl *Field) { 1635 // For anonymous unions, use the class declaration as the key. 1636 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1637 if (RT->getDecl()->isAnonymousStructOrUnion()) 1638 return static_cast<void *>(RT->getDecl()); 1639 } 1640 return static_cast<void *>(Field); 1641} 1642 1643static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1644 return Context.getCanonicalType(BaseType).getTypePtr(); 1645} 1646 1647static void *GetKeyForMember(ASTContext &Context, 1648 CXXBaseOrMemberInitializer *Member, 1649 bool MemberMaybeAnon = false) { 1650 if (!Member->isMemberInitializer()) 1651 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1652 1653 // For fields injected into the class via declaration of an anonymous union, 1654 // use its anonymous union class declaration as the unique key. 1655 FieldDecl *Field = Member->getMember(); 1656 1657 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1658 // data member of the class. Data member used in the initializer list is 1659 // in AnonUnionMember field. 1660 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1661 Field = Member->getAnonUnionMember(); 1662 1663 // If the field is a member of an anonymous struct or union, our key 1664 // is the anonymous record decl that's a direct child of the class. 1665 RecordDecl *RD = Field->getParent(); 1666 if (RD->isAnonymousStructOrUnion()) { 1667 while (true) { 1668 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1669 if (Parent->isAnonymousStructOrUnion()) 1670 RD = Parent; 1671 else 1672 break; 1673 } 1674 1675 return static_cast<void *>(RD); 1676 } 1677 1678 return static_cast<void *>(Field); 1679} 1680 1681static void 1682DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1683 const CXXConstructorDecl *Constructor, 1684 CXXBaseOrMemberInitializer **Inits, 1685 unsigned NumInits) { 1686 if (Constructor->getDeclContext()->isDependentContext()) 1687 return; 1688 1689 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1690 == Diagnostic::Ignored) 1691 return; 1692 1693 // Build the list of bases and members in the order that they'll 1694 // actually be initialized. The explicit initializers should be in 1695 // this same order but may be missing things. 1696 llvm::SmallVector<const void*, 32> IdealInitKeys; 1697 1698 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1699 1700 // 1. Virtual bases. 1701 for (CXXRecordDecl::base_class_const_iterator VBase = 1702 ClassDecl->vbases_begin(), 1703 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1704 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1705 1706 // 2. Non-virtual bases. 1707 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1708 E = ClassDecl->bases_end(); Base != E; ++Base) { 1709 if (Base->isVirtual()) 1710 continue; 1711 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1712 } 1713 1714 // 3. Direct fields. 1715 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1716 E = ClassDecl->field_end(); Field != E; ++Field) 1717 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1718 1719 unsigned NumIdealInits = IdealInitKeys.size(); 1720 unsigned IdealIndex = 0; 1721 1722 CXXBaseOrMemberInitializer *PrevInit = 0; 1723 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1724 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1725 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1726 1727 // Scan forward to try to find this initializer in the idealized 1728 // initializers list. 1729 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1730 if (InitKey == IdealInitKeys[IdealIndex]) 1731 break; 1732 1733 // If we didn't find this initializer, it must be because we 1734 // scanned past it on a previous iteration. That can only 1735 // happen if we're out of order; emit a warning. 1736 if (IdealIndex == NumIdealInits) { 1737 assert(PrevInit && "initializer not found in initializer list"); 1738 1739 Sema::SemaDiagnosticBuilder D = 1740 SemaRef.Diag(PrevInit->getSourceLocation(), 1741 diag::warn_initializer_out_of_order); 1742 1743 if (PrevInit->isMemberInitializer()) 1744 D << 0 << PrevInit->getMember()->getDeclName(); 1745 else 1746 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1747 1748 if (Init->isMemberInitializer()) 1749 D << 0 << Init->getMember()->getDeclName(); 1750 else 1751 D << 1 << Init->getBaseClassInfo()->getType(); 1752 1753 // Move back to the initializer's location in the ideal list. 1754 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1755 if (InitKey == IdealInitKeys[IdealIndex]) 1756 break; 1757 1758 assert(IdealIndex != NumIdealInits && 1759 "initializer not found in initializer list"); 1760 } 1761 1762 PrevInit = Init; 1763 } 1764} 1765 1766namespace { 1767bool CheckRedundantInit(Sema &S, 1768 CXXBaseOrMemberInitializer *Init, 1769 CXXBaseOrMemberInitializer *&PrevInit) { 1770 if (!PrevInit) { 1771 PrevInit = Init; 1772 return false; 1773 } 1774 1775 if (FieldDecl *Field = Init->getMember()) 1776 S.Diag(Init->getSourceLocation(), 1777 diag::err_multiple_mem_initialization) 1778 << Field->getDeclName() 1779 << Init->getSourceRange(); 1780 else { 1781 Type *BaseClass = Init->getBaseClass(); 1782 assert(BaseClass && "neither field nor base"); 1783 S.Diag(Init->getSourceLocation(), 1784 diag::err_multiple_base_initialization) 1785 << QualType(BaseClass, 0) 1786 << Init->getSourceRange(); 1787 } 1788 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1789 << 0 << PrevInit->getSourceRange(); 1790 1791 return true; 1792} 1793 1794typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1795typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1796 1797bool CheckRedundantUnionInit(Sema &S, 1798 CXXBaseOrMemberInitializer *Init, 1799 RedundantUnionMap &Unions) { 1800 FieldDecl *Field = Init->getMember(); 1801 RecordDecl *Parent = Field->getParent(); 1802 if (!Parent->isAnonymousStructOrUnion()) 1803 return false; 1804 1805 NamedDecl *Child = Field; 1806 do { 1807 if (Parent->isUnion()) { 1808 UnionEntry &En = Unions[Parent]; 1809 if (En.first && En.first != Child) { 1810 S.Diag(Init->getSourceLocation(), 1811 diag::err_multiple_mem_union_initialization) 1812 << Field->getDeclName() 1813 << Init->getSourceRange(); 1814 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1815 << 0 << En.second->getSourceRange(); 1816 return true; 1817 } else if (!En.first) { 1818 En.first = Child; 1819 En.second = Init; 1820 } 1821 } 1822 1823 Child = Parent; 1824 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1825 } while (Parent->isAnonymousStructOrUnion()); 1826 1827 return false; 1828} 1829} 1830 1831/// ActOnMemInitializers - Handle the member initializers for a constructor. 1832void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1833 SourceLocation ColonLoc, 1834 MemInitTy **meminits, unsigned NumMemInits, 1835 bool AnyErrors) { 1836 if (!ConstructorDecl) 1837 return; 1838 1839 AdjustDeclIfTemplate(ConstructorDecl); 1840 1841 CXXConstructorDecl *Constructor 1842 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1843 1844 if (!Constructor) { 1845 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1846 return; 1847 } 1848 1849 CXXBaseOrMemberInitializer **MemInits = 1850 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1851 1852 // Mapping for the duplicate initializers check. 1853 // For member initializers, this is keyed with a FieldDecl*. 1854 // For base initializers, this is keyed with a Type*. 1855 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1856 1857 // Mapping for the inconsistent anonymous-union initializers check. 1858 RedundantUnionMap MemberUnions; 1859 1860 bool HadError = false; 1861 for (unsigned i = 0; i < NumMemInits; i++) { 1862 CXXBaseOrMemberInitializer *Init = MemInits[i]; 1863 1864 if (Init->isMemberInitializer()) { 1865 FieldDecl *Field = Init->getMember(); 1866 if (CheckRedundantInit(*this, Init, Members[Field]) || 1867 CheckRedundantUnionInit(*this, Init, MemberUnions)) 1868 HadError = true; 1869 } else { 1870 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 1871 if (CheckRedundantInit(*this, Init, Members[Key])) 1872 HadError = true; 1873 } 1874 } 1875 1876 if (HadError) 1877 return; 1878 1879 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1880 1881 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1882} 1883 1884void 1885Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1886 CXXRecordDecl *ClassDecl) { 1887 // Ignore dependent contexts. 1888 if (ClassDecl->isDependentContext()) 1889 return; 1890 1891 // FIXME: all the access-control diagnostics are positioned on the 1892 // field/base declaration. That's probably good; that said, the 1893 // user might reasonably want to know why the destructor is being 1894 // emitted, and we currently don't say. 1895 1896 // Non-static data members. 1897 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1898 E = ClassDecl->field_end(); I != E; ++I) { 1899 FieldDecl *Field = *I; 1900 1901 QualType FieldType = Context.getBaseElementType(Field->getType()); 1902 1903 const RecordType* RT = FieldType->getAs<RecordType>(); 1904 if (!RT) 1905 continue; 1906 1907 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1908 if (FieldClassDecl->hasTrivialDestructor()) 1909 continue; 1910 1911 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1912 CheckDestructorAccess(Field->getLocation(), Dtor, 1913 PDiag(diag::err_access_dtor_field) 1914 << Field->getDeclName() 1915 << FieldType); 1916 1917 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1918 } 1919 1920 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1921 1922 // Bases. 1923 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1924 E = ClassDecl->bases_end(); Base != E; ++Base) { 1925 // Bases are always records in a well-formed non-dependent class. 1926 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1927 1928 // Remember direct virtual bases. 1929 if (Base->isVirtual()) 1930 DirectVirtualBases.insert(RT); 1931 1932 // Ignore trivial destructors. 1933 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1934 if (BaseClassDecl->hasTrivialDestructor()) 1935 continue; 1936 1937 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1938 1939 // FIXME: caret should be on the start of the class name 1940 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1941 PDiag(diag::err_access_dtor_base) 1942 << Base->getType() 1943 << Base->getSourceRange()); 1944 1945 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1946 } 1947 1948 // Virtual bases. 1949 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1950 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1951 1952 // Bases are always records in a well-formed non-dependent class. 1953 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1954 1955 // Ignore direct virtual bases. 1956 if (DirectVirtualBases.count(RT)) 1957 continue; 1958 1959 // Ignore trivial destructors. 1960 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1961 if (BaseClassDecl->hasTrivialDestructor()) 1962 continue; 1963 1964 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1965 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1966 PDiag(diag::err_access_dtor_vbase) 1967 << VBase->getType()); 1968 1969 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1970 } 1971} 1972 1973void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1974 if (!CDtorDecl) 1975 return; 1976 1977 if (CXXConstructorDecl *Constructor 1978 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1979 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 1980} 1981 1982bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1983 unsigned DiagID, AbstractDiagSelID SelID, 1984 const CXXRecordDecl *CurrentRD) { 1985 if (SelID == -1) 1986 return RequireNonAbstractType(Loc, T, 1987 PDiag(DiagID), CurrentRD); 1988 else 1989 return RequireNonAbstractType(Loc, T, 1990 PDiag(DiagID) << SelID, CurrentRD); 1991} 1992 1993bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1994 const PartialDiagnostic &PD, 1995 const CXXRecordDecl *CurrentRD) { 1996 if (!getLangOptions().CPlusPlus) 1997 return false; 1998 1999 if (const ArrayType *AT = Context.getAsArrayType(T)) 2000 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2001 CurrentRD); 2002 2003 if (const PointerType *PT = T->getAs<PointerType>()) { 2004 // Find the innermost pointer type. 2005 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2006 PT = T; 2007 2008 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2009 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2010 } 2011 2012 const RecordType *RT = T->getAs<RecordType>(); 2013 if (!RT) 2014 return false; 2015 2016 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2017 2018 if (CurrentRD && CurrentRD != RD) 2019 return false; 2020 2021 // FIXME: is this reasonable? It matches current behavior, but.... 2022 if (!RD->getDefinition()) 2023 return false; 2024 2025 if (!RD->isAbstract()) 2026 return false; 2027 2028 Diag(Loc, PD) << RD->getDeclName(); 2029 2030 // Check if we've already emitted the list of pure virtual functions for this 2031 // class. 2032 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2033 return true; 2034 2035 CXXFinalOverriderMap FinalOverriders; 2036 RD->getFinalOverriders(FinalOverriders); 2037 2038 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2039 MEnd = FinalOverriders.end(); 2040 M != MEnd; 2041 ++M) { 2042 for (OverridingMethods::iterator SO = M->second.begin(), 2043 SOEnd = M->second.end(); 2044 SO != SOEnd; ++SO) { 2045 // C++ [class.abstract]p4: 2046 // A class is abstract if it contains or inherits at least one 2047 // pure virtual function for which the final overrider is pure 2048 // virtual. 2049 2050 // 2051 if (SO->second.size() != 1) 2052 continue; 2053 2054 if (!SO->second.front().Method->isPure()) 2055 continue; 2056 2057 Diag(SO->second.front().Method->getLocation(), 2058 diag::note_pure_virtual_function) 2059 << SO->second.front().Method->getDeclName(); 2060 } 2061 } 2062 2063 if (!PureVirtualClassDiagSet) 2064 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2065 PureVirtualClassDiagSet->insert(RD); 2066 2067 return true; 2068} 2069 2070namespace { 2071 class AbstractClassUsageDiagnoser 2072 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2073 Sema &SemaRef; 2074 CXXRecordDecl *AbstractClass; 2075 2076 bool VisitDeclContext(const DeclContext *DC) { 2077 bool Invalid = false; 2078 2079 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2080 E = DC->decls_end(); I != E; ++I) 2081 Invalid |= Visit(*I); 2082 2083 return Invalid; 2084 } 2085 2086 public: 2087 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2088 : SemaRef(SemaRef), AbstractClass(ac) { 2089 Visit(SemaRef.Context.getTranslationUnitDecl()); 2090 } 2091 2092 bool VisitFunctionDecl(const FunctionDecl *FD) { 2093 if (FD->isThisDeclarationADefinition()) { 2094 // No need to do the check if we're in a definition, because it requires 2095 // that the return/param types are complete. 2096 // because that requires 2097 return VisitDeclContext(FD); 2098 } 2099 2100 // Check the return type. 2101 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2102 bool Invalid = 2103 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2104 diag::err_abstract_type_in_decl, 2105 Sema::AbstractReturnType, 2106 AbstractClass); 2107 2108 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2109 E = FD->param_end(); I != E; ++I) { 2110 const ParmVarDecl *VD = *I; 2111 Invalid |= 2112 SemaRef.RequireNonAbstractType(VD->getLocation(), 2113 VD->getOriginalType(), 2114 diag::err_abstract_type_in_decl, 2115 Sema::AbstractParamType, 2116 AbstractClass); 2117 } 2118 2119 return Invalid; 2120 } 2121 2122 bool VisitDecl(const Decl* D) { 2123 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2124 return VisitDeclContext(DC); 2125 2126 return false; 2127 } 2128 }; 2129} 2130 2131/// \brief Perform semantic checks on a class definition that has been 2132/// completing, introducing implicitly-declared members, checking for 2133/// abstract types, etc. 2134void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2135 if (!Record || Record->isInvalidDecl()) 2136 return; 2137 2138 if (!Record->isDependentType()) 2139 AddImplicitlyDeclaredMembersToClass(Record); 2140 2141 if (Record->isInvalidDecl()) 2142 return; 2143 2144 // Set access bits correctly on the directly-declared conversions. 2145 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2146 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2147 Convs->setAccess(I, (*I)->getAccess()); 2148 2149 // Determine whether we need to check for final overriders. We do 2150 // this either when there are virtual base classes (in which case we 2151 // may end up finding multiple final overriders for a given virtual 2152 // function) or any of the base classes is abstract (in which case 2153 // we might detect that this class is abstract). 2154 bool CheckFinalOverriders = false; 2155 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2156 !Record->isDependentType()) { 2157 if (Record->getNumVBases()) 2158 CheckFinalOverriders = true; 2159 else if (!Record->isAbstract()) { 2160 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2161 BEnd = Record->bases_end(); 2162 B != BEnd; ++B) { 2163 CXXRecordDecl *BaseDecl 2164 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2165 if (BaseDecl->isAbstract()) { 2166 CheckFinalOverriders = true; 2167 break; 2168 } 2169 } 2170 } 2171 } 2172 2173 if (CheckFinalOverriders) { 2174 CXXFinalOverriderMap FinalOverriders; 2175 Record->getFinalOverriders(FinalOverriders); 2176 2177 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2178 MEnd = FinalOverriders.end(); 2179 M != MEnd; ++M) { 2180 for (OverridingMethods::iterator SO = M->second.begin(), 2181 SOEnd = M->second.end(); 2182 SO != SOEnd; ++SO) { 2183 assert(SO->second.size() > 0 && 2184 "All virtual functions have overridding virtual functions"); 2185 if (SO->second.size() == 1) { 2186 // C++ [class.abstract]p4: 2187 // A class is abstract if it contains or inherits at least one 2188 // pure virtual function for which the final overrider is pure 2189 // virtual. 2190 if (SO->second.front().Method->isPure()) 2191 Record->setAbstract(true); 2192 continue; 2193 } 2194 2195 // C++ [class.virtual]p2: 2196 // In a derived class, if a virtual member function of a base 2197 // class subobject has more than one final overrider the 2198 // program is ill-formed. 2199 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2200 << (NamedDecl *)M->first << Record; 2201 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2202 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2203 OMEnd = SO->second.end(); 2204 OM != OMEnd; ++OM) 2205 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2206 << (NamedDecl *)M->first << OM->Method->getParent(); 2207 2208 Record->setInvalidDecl(); 2209 } 2210 } 2211 } 2212 2213 if (Record->isAbstract() && !Record->isInvalidDecl()) 2214 (void)AbstractClassUsageDiagnoser(*this, Record); 2215} 2216 2217void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2218 DeclPtrTy TagDecl, 2219 SourceLocation LBrac, 2220 SourceLocation RBrac, 2221 AttributeList *AttrList) { 2222 if (!TagDecl) 2223 return; 2224 2225 AdjustDeclIfTemplate(TagDecl); 2226 2227 ActOnFields(S, RLoc, TagDecl, 2228 (DeclPtrTy*)FieldCollector->getCurFields(), 2229 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2230 2231 CheckCompletedCXXClass( 2232 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2233} 2234 2235/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2236/// special functions, such as the default constructor, copy 2237/// constructor, or destructor, to the given C++ class (C++ 2238/// [special]p1). This routine can only be executed just before the 2239/// definition of the class is complete. 2240void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2241 CanQualType ClassType 2242 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2243 2244 // FIXME: Implicit declarations have exception specifications, which are 2245 // the union of the specifications of the implicitly called functions. 2246 2247 if (!ClassDecl->hasUserDeclaredConstructor()) { 2248 // C++ [class.ctor]p5: 2249 // A default constructor for a class X is a constructor of class X 2250 // that can be called without an argument. If there is no 2251 // user-declared constructor for class X, a default constructor is 2252 // implicitly declared. An implicitly-declared default constructor 2253 // is an inline public member of its class. 2254 DeclarationName Name 2255 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2256 CXXConstructorDecl *DefaultCon = 2257 CXXConstructorDecl::Create(Context, ClassDecl, 2258 ClassDecl->getLocation(), Name, 2259 Context.getFunctionType(Context.VoidTy, 2260 0, 0, false, 0, 2261 /*FIXME*/false, false, 2262 0, 0, 2263 FunctionType::ExtInfo()), 2264 /*TInfo=*/0, 2265 /*isExplicit=*/false, 2266 /*isInline=*/true, 2267 /*isImplicitlyDeclared=*/true); 2268 DefaultCon->setAccess(AS_public); 2269 DefaultCon->setImplicit(); 2270 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2271 ClassDecl->addDecl(DefaultCon); 2272 } 2273 2274 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2275 // C++ [class.copy]p4: 2276 // If the class definition does not explicitly declare a copy 2277 // constructor, one is declared implicitly. 2278 2279 // C++ [class.copy]p5: 2280 // The implicitly-declared copy constructor for a class X will 2281 // have the form 2282 // 2283 // X::X(const X&) 2284 // 2285 // if 2286 bool HasConstCopyConstructor = true; 2287 2288 // -- each direct or virtual base class B of X has a copy 2289 // constructor whose first parameter is of type const B& or 2290 // const volatile B&, and 2291 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2292 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2293 const CXXRecordDecl *BaseClassDecl 2294 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2295 HasConstCopyConstructor 2296 = BaseClassDecl->hasConstCopyConstructor(Context); 2297 } 2298 2299 // -- for all the nonstatic data members of X that are of a 2300 // class type M (or array thereof), each such class type 2301 // has a copy constructor whose first parameter is of type 2302 // const M& or const volatile M&. 2303 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2304 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2305 ++Field) { 2306 QualType FieldType = (*Field)->getType(); 2307 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2308 FieldType = Array->getElementType(); 2309 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2310 const CXXRecordDecl *FieldClassDecl 2311 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2312 HasConstCopyConstructor 2313 = FieldClassDecl->hasConstCopyConstructor(Context); 2314 } 2315 } 2316 2317 // Otherwise, the implicitly declared copy constructor will have 2318 // the form 2319 // 2320 // X::X(X&) 2321 QualType ArgType = ClassType; 2322 if (HasConstCopyConstructor) 2323 ArgType = ArgType.withConst(); 2324 ArgType = Context.getLValueReferenceType(ArgType); 2325 2326 // An implicitly-declared copy constructor is an inline public 2327 // member of its class. 2328 DeclarationName Name 2329 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2330 CXXConstructorDecl *CopyConstructor 2331 = CXXConstructorDecl::Create(Context, ClassDecl, 2332 ClassDecl->getLocation(), Name, 2333 Context.getFunctionType(Context.VoidTy, 2334 &ArgType, 1, 2335 false, 0, 2336 /*FIXME:*/false, 2337 false, 0, 0, 2338 FunctionType::ExtInfo()), 2339 /*TInfo=*/0, 2340 /*isExplicit=*/false, 2341 /*isInline=*/true, 2342 /*isImplicitlyDeclared=*/true); 2343 CopyConstructor->setAccess(AS_public); 2344 CopyConstructor->setImplicit(); 2345 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2346 2347 // Add the parameter to the constructor. 2348 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2349 ClassDecl->getLocation(), 2350 /*IdentifierInfo=*/0, 2351 ArgType, /*TInfo=*/0, 2352 VarDecl::None, 0); 2353 CopyConstructor->setParams(&FromParam, 1); 2354 ClassDecl->addDecl(CopyConstructor); 2355 } 2356 2357 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2358 // Note: The following rules are largely analoguous to the copy 2359 // constructor rules. Note that virtual bases are not taken into account 2360 // for determining the argument type of the operator. Note also that 2361 // operators taking an object instead of a reference are allowed. 2362 // 2363 // C++ [class.copy]p10: 2364 // If the class definition does not explicitly declare a copy 2365 // assignment operator, one is declared implicitly. 2366 // The implicitly-defined copy assignment operator for a class X 2367 // will have the form 2368 // 2369 // X& X::operator=(const X&) 2370 // 2371 // if 2372 bool HasConstCopyAssignment = true; 2373 2374 // -- each direct base class B of X has a copy assignment operator 2375 // whose parameter is of type const B&, const volatile B& or B, 2376 // and 2377 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2378 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2379 assert(!Base->getType()->isDependentType() && 2380 "Cannot generate implicit members for class with dependent bases."); 2381 const CXXRecordDecl *BaseClassDecl 2382 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2383 const CXXMethodDecl *MD = 0; 2384 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2385 MD); 2386 } 2387 2388 // -- for all the nonstatic data members of X that are of a class 2389 // type M (or array thereof), each such class type has a copy 2390 // assignment operator whose parameter is of type const M&, 2391 // const volatile M& or M. 2392 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2393 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2394 ++Field) { 2395 QualType FieldType = (*Field)->getType(); 2396 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2397 FieldType = Array->getElementType(); 2398 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2399 const CXXRecordDecl *FieldClassDecl 2400 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2401 const CXXMethodDecl *MD = 0; 2402 HasConstCopyAssignment 2403 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2404 } 2405 } 2406 2407 // Otherwise, the implicitly declared copy assignment operator will 2408 // have the form 2409 // 2410 // X& X::operator=(X&) 2411 QualType ArgType = ClassType; 2412 QualType RetType = Context.getLValueReferenceType(ArgType); 2413 if (HasConstCopyAssignment) 2414 ArgType = ArgType.withConst(); 2415 ArgType = Context.getLValueReferenceType(ArgType); 2416 2417 // An implicitly-declared copy assignment operator is an inline public 2418 // member of its class. 2419 DeclarationName Name = 2420 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2421 CXXMethodDecl *CopyAssignment = 2422 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2423 Context.getFunctionType(RetType, &ArgType, 1, 2424 false, 0, 2425 /*FIXME:*/false, 2426 false, 0, 0, 2427 FunctionType::ExtInfo()), 2428 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2429 CopyAssignment->setAccess(AS_public); 2430 CopyAssignment->setImplicit(); 2431 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2432 CopyAssignment->setCopyAssignment(true); 2433 2434 // Add the parameter to the operator. 2435 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2436 ClassDecl->getLocation(), 2437 /*IdentifierInfo=*/0, 2438 ArgType, /*TInfo=*/0, 2439 VarDecl::None, 0); 2440 CopyAssignment->setParams(&FromParam, 1); 2441 2442 // Don't call addedAssignmentOperator. There is no way to distinguish an 2443 // implicit from an explicit assignment operator. 2444 ClassDecl->addDecl(CopyAssignment); 2445 AddOverriddenMethods(ClassDecl, CopyAssignment); 2446 } 2447 2448 if (!ClassDecl->hasUserDeclaredDestructor()) { 2449 // C++ [class.dtor]p2: 2450 // If a class has no user-declared destructor, a destructor is 2451 // declared implicitly. An implicitly-declared destructor is an 2452 // inline public member of its class. 2453 QualType Ty = Context.getFunctionType(Context.VoidTy, 2454 0, 0, false, 0, 2455 /*FIXME:*/false, 2456 false, 0, 0, FunctionType::ExtInfo()); 2457 2458 DeclarationName Name 2459 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2460 CXXDestructorDecl *Destructor 2461 = CXXDestructorDecl::Create(Context, ClassDecl, 2462 ClassDecl->getLocation(), Name, Ty, 2463 /*isInline=*/true, 2464 /*isImplicitlyDeclared=*/true); 2465 Destructor->setAccess(AS_public); 2466 Destructor->setImplicit(); 2467 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2468 ClassDecl->addDecl(Destructor); 2469 2470 // This could be uniqued if it ever proves significant. 2471 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2472 2473 AddOverriddenMethods(ClassDecl, Destructor); 2474 } 2475} 2476 2477void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2478 Decl *D = TemplateD.getAs<Decl>(); 2479 if (!D) 2480 return; 2481 2482 TemplateParameterList *Params = 0; 2483 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2484 Params = Template->getTemplateParameters(); 2485 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2486 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2487 Params = PartialSpec->getTemplateParameters(); 2488 else 2489 return; 2490 2491 for (TemplateParameterList::iterator Param = Params->begin(), 2492 ParamEnd = Params->end(); 2493 Param != ParamEnd; ++Param) { 2494 NamedDecl *Named = cast<NamedDecl>(*Param); 2495 if (Named->getDeclName()) { 2496 S->AddDecl(DeclPtrTy::make(Named)); 2497 IdResolver.AddDecl(Named); 2498 } 2499 } 2500} 2501 2502void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2503 if (!RecordD) return; 2504 AdjustDeclIfTemplate(RecordD); 2505 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2506 PushDeclContext(S, Record); 2507} 2508 2509void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2510 if (!RecordD) return; 2511 PopDeclContext(); 2512} 2513 2514/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2515/// parsing a top-level (non-nested) C++ class, and we are now 2516/// parsing those parts of the given Method declaration that could 2517/// not be parsed earlier (C++ [class.mem]p2), such as default 2518/// arguments. This action should enter the scope of the given 2519/// Method declaration as if we had just parsed the qualified method 2520/// name. However, it should not bring the parameters into scope; 2521/// that will be performed by ActOnDelayedCXXMethodParameter. 2522void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2523} 2524 2525/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2526/// C++ method declaration. We're (re-)introducing the given 2527/// function parameter into scope for use in parsing later parts of 2528/// the method declaration. For example, we could see an 2529/// ActOnParamDefaultArgument event for this parameter. 2530void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2531 if (!ParamD) 2532 return; 2533 2534 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2535 2536 // If this parameter has an unparsed default argument, clear it out 2537 // to make way for the parsed default argument. 2538 if (Param->hasUnparsedDefaultArg()) 2539 Param->setDefaultArg(0); 2540 2541 S->AddDecl(DeclPtrTy::make(Param)); 2542 if (Param->getDeclName()) 2543 IdResolver.AddDecl(Param); 2544} 2545 2546/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2547/// processing the delayed method declaration for Method. The method 2548/// declaration is now considered finished. There may be a separate 2549/// ActOnStartOfFunctionDef action later (not necessarily 2550/// immediately!) for this method, if it was also defined inside the 2551/// class body. 2552void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2553 if (!MethodD) 2554 return; 2555 2556 AdjustDeclIfTemplate(MethodD); 2557 2558 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2559 2560 // Now that we have our default arguments, check the constructor 2561 // again. It could produce additional diagnostics or affect whether 2562 // the class has implicitly-declared destructors, among other 2563 // things. 2564 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2565 CheckConstructor(Constructor); 2566 2567 // Check the default arguments, which we may have added. 2568 if (!Method->isInvalidDecl()) 2569 CheckCXXDefaultArguments(Method); 2570} 2571 2572/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2573/// the well-formedness of the constructor declarator @p D with type @p 2574/// R. If there are any errors in the declarator, this routine will 2575/// emit diagnostics and set the invalid bit to true. In any case, the type 2576/// will be updated to reflect a well-formed type for the constructor and 2577/// returned. 2578QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2579 FunctionDecl::StorageClass &SC) { 2580 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2581 2582 // C++ [class.ctor]p3: 2583 // A constructor shall not be virtual (10.3) or static (9.4). A 2584 // constructor can be invoked for a const, volatile or const 2585 // volatile object. A constructor shall not be declared const, 2586 // volatile, or const volatile (9.3.2). 2587 if (isVirtual) { 2588 if (!D.isInvalidType()) 2589 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2590 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2591 << SourceRange(D.getIdentifierLoc()); 2592 D.setInvalidType(); 2593 } 2594 if (SC == FunctionDecl::Static) { 2595 if (!D.isInvalidType()) 2596 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2597 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2598 << SourceRange(D.getIdentifierLoc()); 2599 D.setInvalidType(); 2600 SC = FunctionDecl::None; 2601 } 2602 2603 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2604 if (FTI.TypeQuals != 0) { 2605 if (FTI.TypeQuals & Qualifiers::Const) 2606 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2607 << "const" << SourceRange(D.getIdentifierLoc()); 2608 if (FTI.TypeQuals & Qualifiers::Volatile) 2609 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2610 << "volatile" << SourceRange(D.getIdentifierLoc()); 2611 if (FTI.TypeQuals & Qualifiers::Restrict) 2612 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2613 << "restrict" << SourceRange(D.getIdentifierLoc()); 2614 } 2615 2616 // Rebuild the function type "R" without any type qualifiers (in 2617 // case any of the errors above fired) and with "void" as the 2618 // return type, since constructors don't have return types. We 2619 // *always* have to do this, because GetTypeForDeclarator will 2620 // put in a result type of "int" when none was specified. 2621 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2622 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2623 Proto->getNumArgs(), 2624 Proto->isVariadic(), 0, 2625 Proto->hasExceptionSpec(), 2626 Proto->hasAnyExceptionSpec(), 2627 Proto->getNumExceptions(), 2628 Proto->exception_begin(), 2629 Proto->getExtInfo()); 2630} 2631 2632/// CheckConstructor - Checks a fully-formed constructor for 2633/// well-formedness, issuing any diagnostics required. Returns true if 2634/// the constructor declarator is invalid. 2635void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2636 CXXRecordDecl *ClassDecl 2637 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2638 if (!ClassDecl) 2639 return Constructor->setInvalidDecl(); 2640 2641 // C++ [class.copy]p3: 2642 // A declaration of a constructor for a class X is ill-formed if 2643 // its first parameter is of type (optionally cv-qualified) X and 2644 // either there are no other parameters or else all other 2645 // parameters have default arguments. 2646 if (!Constructor->isInvalidDecl() && 2647 ((Constructor->getNumParams() == 1) || 2648 (Constructor->getNumParams() > 1 && 2649 Constructor->getParamDecl(1)->hasDefaultArg())) && 2650 Constructor->getTemplateSpecializationKind() 2651 != TSK_ImplicitInstantiation) { 2652 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2653 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2654 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2655 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2656 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2657 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2658 2659 // FIXME: Rather that making the constructor invalid, we should endeavor 2660 // to fix the type. 2661 Constructor->setInvalidDecl(); 2662 } 2663 } 2664 2665 // Notify the class that we've added a constructor. 2666 ClassDecl->addedConstructor(Context, Constructor); 2667} 2668 2669/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2670/// issuing any diagnostics required. Returns true on error. 2671bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2672 CXXRecordDecl *RD = Destructor->getParent(); 2673 2674 if (Destructor->isVirtual()) { 2675 SourceLocation Loc; 2676 2677 if (!Destructor->isImplicit()) 2678 Loc = Destructor->getLocation(); 2679 else 2680 Loc = RD->getLocation(); 2681 2682 // If we have a virtual destructor, look up the deallocation function 2683 FunctionDecl *OperatorDelete = 0; 2684 DeclarationName Name = 2685 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2686 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2687 return true; 2688 2689 Destructor->setOperatorDelete(OperatorDelete); 2690 } 2691 2692 return false; 2693} 2694 2695static inline bool 2696FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2697 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2698 FTI.ArgInfo[0].Param && 2699 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2700} 2701 2702/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2703/// the well-formednes of the destructor declarator @p D with type @p 2704/// R. If there are any errors in the declarator, this routine will 2705/// emit diagnostics and set the declarator to invalid. Even if this happens, 2706/// will be updated to reflect a well-formed type for the destructor and 2707/// returned. 2708QualType Sema::CheckDestructorDeclarator(Declarator &D, 2709 FunctionDecl::StorageClass& SC) { 2710 // C++ [class.dtor]p1: 2711 // [...] A typedef-name that names a class is a class-name 2712 // (7.1.3); however, a typedef-name that names a class shall not 2713 // be used as the identifier in the declarator for a destructor 2714 // declaration. 2715 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2716 if (isa<TypedefType>(DeclaratorType)) { 2717 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2718 << DeclaratorType; 2719 D.setInvalidType(); 2720 } 2721 2722 // C++ [class.dtor]p2: 2723 // A destructor is used to destroy objects of its class type. A 2724 // destructor takes no parameters, and no return type can be 2725 // specified for it (not even void). The address of a destructor 2726 // shall not be taken. A destructor shall not be static. A 2727 // destructor can be invoked for a const, volatile or const 2728 // volatile object. A destructor shall not be declared const, 2729 // volatile or const volatile (9.3.2). 2730 if (SC == FunctionDecl::Static) { 2731 if (!D.isInvalidType()) 2732 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2733 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2734 << SourceRange(D.getIdentifierLoc()); 2735 SC = FunctionDecl::None; 2736 D.setInvalidType(); 2737 } 2738 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2739 // Destructors don't have return types, but the parser will 2740 // happily parse something like: 2741 // 2742 // class X { 2743 // float ~X(); 2744 // }; 2745 // 2746 // The return type will be eliminated later. 2747 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2748 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2749 << SourceRange(D.getIdentifierLoc()); 2750 } 2751 2752 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2753 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2754 if (FTI.TypeQuals & Qualifiers::Const) 2755 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2756 << "const" << SourceRange(D.getIdentifierLoc()); 2757 if (FTI.TypeQuals & Qualifiers::Volatile) 2758 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2759 << "volatile" << SourceRange(D.getIdentifierLoc()); 2760 if (FTI.TypeQuals & Qualifiers::Restrict) 2761 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2762 << "restrict" << SourceRange(D.getIdentifierLoc()); 2763 D.setInvalidType(); 2764 } 2765 2766 // Make sure we don't have any parameters. 2767 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2768 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2769 2770 // Delete the parameters. 2771 FTI.freeArgs(); 2772 D.setInvalidType(); 2773 } 2774 2775 // Make sure the destructor isn't variadic. 2776 if (FTI.isVariadic) { 2777 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2778 D.setInvalidType(); 2779 } 2780 2781 // Rebuild the function type "R" without any type qualifiers or 2782 // parameters (in case any of the errors above fired) and with 2783 // "void" as the return type, since destructors don't have return 2784 // types. We *always* have to do this, because GetTypeForDeclarator 2785 // will put in a result type of "int" when none was specified. 2786 // FIXME: Exceptions! 2787 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2788 false, false, 0, 0, FunctionType::ExtInfo()); 2789} 2790 2791/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2792/// well-formednes of the conversion function declarator @p D with 2793/// type @p R. If there are any errors in the declarator, this routine 2794/// will emit diagnostics and return true. Otherwise, it will return 2795/// false. Either way, the type @p R will be updated to reflect a 2796/// well-formed type for the conversion operator. 2797void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2798 FunctionDecl::StorageClass& SC) { 2799 // C++ [class.conv.fct]p1: 2800 // Neither parameter types nor return type can be specified. The 2801 // type of a conversion function (8.3.5) is "function taking no 2802 // parameter returning conversion-type-id." 2803 if (SC == FunctionDecl::Static) { 2804 if (!D.isInvalidType()) 2805 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2806 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2807 << SourceRange(D.getIdentifierLoc()); 2808 D.setInvalidType(); 2809 SC = FunctionDecl::None; 2810 } 2811 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2812 // Conversion functions don't have return types, but the parser will 2813 // happily parse something like: 2814 // 2815 // class X { 2816 // float operator bool(); 2817 // }; 2818 // 2819 // The return type will be changed later anyway. 2820 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2821 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2822 << SourceRange(D.getIdentifierLoc()); 2823 } 2824 2825 // Make sure we don't have any parameters. 2826 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2827 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2828 2829 // Delete the parameters. 2830 D.getTypeObject(0).Fun.freeArgs(); 2831 D.setInvalidType(); 2832 } 2833 2834 // Make sure the conversion function isn't variadic. 2835 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2836 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2837 D.setInvalidType(); 2838 } 2839 2840 // C++ [class.conv.fct]p4: 2841 // The conversion-type-id shall not represent a function type nor 2842 // an array type. 2843 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2844 if (ConvType->isArrayType()) { 2845 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2846 ConvType = Context.getPointerType(ConvType); 2847 D.setInvalidType(); 2848 } else if (ConvType->isFunctionType()) { 2849 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2850 ConvType = Context.getPointerType(ConvType); 2851 D.setInvalidType(); 2852 } 2853 2854 // Rebuild the function type "R" without any parameters (in case any 2855 // of the errors above fired) and with the conversion type as the 2856 // return type. 2857 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2858 R = Context.getFunctionType(ConvType, 0, 0, false, 2859 Proto->getTypeQuals(), 2860 Proto->hasExceptionSpec(), 2861 Proto->hasAnyExceptionSpec(), 2862 Proto->getNumExceptions(), 2863 Proto->exception_begin(), 2864 Proto->getExtInfo()); 2865 2866 // C++0x explicit conversion operators. 2867 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2868 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2869 diag::warn_explicit_conversion_functions) 2870 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2871} 2872 2873/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2874/// the declaration of the given C++ conversion function. This routine 2875/// is responsible for recording the conversion function in the C++ 2876/// class, if possible. 2877Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2878 assert(Conversion && "Expected to receive a conversion function declaration"); 2879 2880 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2881 2882 // Make sure we aren't redeclaring the conversion function. 2883 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2884 2885 // C++ [class.conv.fct]p1: 2886 // [...] A conversion function is never used to convert a 2887 // (possibly cv-qualified) object to the (possibly cv-qualified) 2888 // same object type (or a reference to it), to a (possibly 2889 // cv-qualified) base class of that type (or a reference to it), 2890 // or to (possibly cv-qualified) void. 2891 // FIXME: Suppress this warning if the conversion function ends up being a 2892 // virtual function that overrides a virtual function in a base class. 2893 QualType ClassType 2894 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2895 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2896 ConvType = ConvTypeRef->getPointeeType(); 2897 if (ConvType->isRecordType()) { 2898 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2899 if (ConvType == ClassType) 2900 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2901 << ClassType; 2902 else if (IsDerivedFrom(ClassType, ConvType)) 2903 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2904 << ClassType << ConvType; 2905 } else if (ConvType->isVoidType()) { 2906 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2907 << ClassType << ConvType; 2908 } 2909 2910 if (Conversion->getPrimaryTemplate()) { 2911 // ignore specializations 2912 } else if (Conversion->getPreviousDeclaration()) { 2913 if (FunctionTemplateDecl *ConversionTemplate 2914 = Conversion->getDescribedFunctionTemplate()) { 2915 if (ClassDecl->replaceConversion( 2916 ConversionTemplate->getPreviousDeclaration(), 2917 ConversionTemplate)) 2918 return DeclPtrTy::make(ConversionTemplate); 2919 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2920 Conversion)) 2921 return DeclPtrTy::make(Conversion); 2922 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2923 } else if (FunctionTemplateDecl *ConversionTemplate 2924 = Conversion->getDescribedFunctionTemplate()) 2925 ClassDecl->addConversionFunction(ConversionTemplate); 2926 else 2927 ClassDecl->addConversionFunction(Conversion); 2928 2929 return DeclPtrTy::make(Conversion); 2930} 2931 2932//===----------------------------------------------------------------------===// 2933// Namespace Handling 2934//===----------------------------------------------------------------------===// 2935 2936/// ActOnStartNamespaceDef - This is called at the start of a namespace 2937/// definition. 2938Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2939 SourceLocation IdentLoc, 2940 IdentifierInfo *II, 2941 SourceLocation LBrace, 2942 AttributeList *AttrList) { 2943 NamespaceDecl *Namespc = 2944 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2945 Namespc->setLBracLoc(LBrace); 2946 2947 Scope *DeclRegionScope = NamespcScope->getParent(); 2948 2949 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2950 2951 if (II) { 2952 // C++ [namespace.def]p2: 2953 // The identifier in an original-namespace-definition shall not have been 2954 // previously defined in the declarative region in which the 2955 // original-namespace-definition appears. The identifier in an 2956 // original-namespace-definition is the name of the namespace. Subsequently 2957 // in that declarative region, it is treated as an original-namespace-name. 2958 2959 NamedDecl *PrevDecl 2960 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2961 ForRedeclaration); 2962 2963 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2964 // This is an extended namespace definition. 2965 // Attach this namespace decl to the chain of extended namespace 2966 // definitions. 2967 OrigNS->setNextNamespace(Namespc); 2968 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2969 2970 // Remove the previous declaration from the scope. 2971 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2972 IdResolver.RemoveDecl(OrigNS); 2973 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2974 } 2975 } else if (PrevDecl) { 2976 // This is an invalid name redefinition. 2977 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2978 << Namespc->getDeclName(); 2979 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2980 Namespc->setInvalidDecl(); 2981 // Continue on to push Namespc as current DeclContext and return it. 2982 } else if (II->isStr("std") && 2983 CurContext->getLookupContext()->isTranslationUnit()) { 2984 // This is the first "real" definition of the namespace "std", so update 2985 // our cache of the "std" namespace to point at this definition. 2986 if (StdNamespace) { 2987 // We had already defined a dummy namespace "std". Link this new 2988 // namespace definition to the dummy namespace "std". 2989 StdNamespace->setNextNamespace(Namespc); 2990 StdNamespace->setLocation(IdentLoc); 2991 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2992 } 2993 2994 // Make our StdNamespace cache point at the first real definition of the 2995 // "std" namespace. 2996 StdNamespace = Namespc; 2997 } 2998 2999 PushOnScopeChains(Namespc, DeclRegionScope); 3000 } else { 3001 // Anonymous namespaces. 3002 assert(Namespc->isAnonymousNamespace()); 3003 3004 // Link the anonymous namespace into its parent. 3005 NamespaceDecl *PrevDecl; 3006 DeclContext *Parent = CurContext->getLookupContext(); 3007 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3008 PrevDecl = TU->getAnonymousNamespace(); 3009 TU->setAnonymousNamespace(Namespc); 3010 } else { 3011 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3012 PrevDecl = ND->getAnonymousNamespace(); 3013 ND->setAnonymousNamespace(Namespc); 3014 } 3015 3016 // Link the anonymous namespace with its previous declaration. 3017 if (PrevDecl) { 3018 assert(PrevDecl->isAnonymousNamespace()); 3019 assert(!PrevDecl->getNextNamespace()); 3020 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3021 PrevDecl->setNextNamespace(Namespc); 3022 } 3023 3024 CurContext->addDecl(Namespc); 3025 3026 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3027 // behaves as if it were replaced by 3028 // namespace unique { /* empty body */ } 3029 // using namespace unique; 3030 // namespace unique { namespace-body } 3031 // where all occurrences of 'unique' in a translation unit are 3032 // replaced by the same identifier and this identifier differs 3033 // from all other identifiers in the entire program. 3034 3035 // We just create the namespace with an empty name and then add an 3036 // implicit using declaration, just like the standard suggests. 3037 // 3038 // CodeGen enforces the "universally unique" aspect by giving all 3039 // declarations semantically contained within an anonymous 3040 // namespace internal linkage. 3041 3042 if (!PrevDecl) { 3043 UsingDirectiveDecl* UD 3044 = UsingDirectiveDecl::Create(Context, CurContext, 3045 /* 'using' */ LBrace, 3046 /* 'namespace' */ SourceLocation(), 3047 /* qualifier */ SourceRange(), 3048 /* NNS */ NULL, 3049 /* identifier */ SourceLocation(), 3050 Namespc, 3051 /* Ancestor */ CurContext); 3052 UD->setImplicit(); 3053 CurContext->addDecl(UD); 3054 } 3055 } 3056 3057 // Although we could have an invalid decl (i.e. the namespace name is a 3058 // redefinition), push it as current DeclContext and try to continue parsing. 3059 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3060 // for the namespace has the declarations that showed up in that particular 3061 // namespace definition. 3062 PushDeclContext(NamespcScope, Namespc); 3063 return DeclPtrTy::make(Namespc); 3064} 3065 3066/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3067/// is a namespace alias, returns the namespace it points to. 3068static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3069 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3070 return AD->getNamespace(); 3071 return dyn_cast_or_null<NamespaceDecl>(D); 3072} 3073 3074/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3075/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3076void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3077 Decl *Dcl = D.getAs<Decl>(); 3078 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3079 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3080 Namespc->setRBracLoc(RBrace); 3081 PopDeclContext(); 3082} 3083 3084Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3085 SourceLocation UsingLoc, 3086 SourceLocation NamespcLoc, 3087 CXXScopeSpec &SS, 3088 SourceLocation IdentLoc, 3089 IdentifierInfo *NamespcName, 3090 AttributeList *AttrList) { 3091 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3092 assert(NamespcName && "Invalid NamespcName."); 3093 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3094 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3095 3096 UsingDirectiveDecl *UDir = 0; 3097 3098 // Lookup namespace name. 3099 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3100 LookupParsedName(R, S, &SS); 3101 if (R.isAmbiguous()) 3102 return DeclPtrTy(); 3103 3104 if (!R.empty()) { 3105 NamedDecl *Named = R.getFoundDecl(); 3106 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3107 && "expected namespace decl"); 3108 // C++ [namespace.udir]p1: 3109 // A using-directive specifies that the names in the nominated 3110 // namespace can be used in the scope in which the 3111 // using-directive appears after the using-directive. During 3112 // unqualified name lookup (3.4.1), the names appear as if they 3113 // were declared in the nearest enclosing namespace which 3114 // contains both the using-directive and the nominated 3115 // namespace. [Note: in this context, "contains" means "contains 3116 // directly or indirectly". ] 3117 3118 // Find enclosing context containing both using-directive and 3119 // nominated namespace. 3120 NamespaceDecl *NS = getNamespaceDecl(Named); 3121 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3122 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3123 CommonAncestor = CommonAncestor->getParent(); 3124 3125 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3126 SS.getRange(), 3127 (NestedNameSpecifier *)SS.getScopeRep(), 3128 IdentLoc, Named, CommonAncestor); 3129 PushUsingDirective(S, UDir); 3130 } else { 3131 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3132 } 3133 3134 // FIXME: We ignore attributes for now. 3135 delete AttrList; 3136 return DeclPtrTy::make(UDir); 3137} 3138 3139void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3140 // If scope has associated entity, then using directive is at namespace 3141 // or translation unit scope. We add UsingDirectiveDecls, into 3142 // it's lookup structure. 3143 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3144 Ctx->addDecl(UDir); 3145 else 3146 // Otherwise it is block-sope. using-directives will affect lookup 3147 // only to the end of scope. 3148 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3149} 3150 3151 3152Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3153 AccessSpecifier AS, 3154 bool HasUsingKeyword, 3155 SourceLocation UsingLoc, 3156 CXXScopeSpec &SS, 3157 UnqualifiedId &Name, 3158 AttributeList *AttrList, 3159 bool IsTypeName, 3160 SourceLocation TypenameLoc) { 3161 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3162 3163 switch (Name.getKind()) { 3164 case UnqualifiedId::IK_Identifier: 3165 case UnqualifiedId::IK_OperatorFunctionId: 3166 case UnqualifiedId::IK_LiteralOperatorId: 3167 case UnqualifiedId::IK_ConversionFunctionId: 3168 break; 3169 3170 case UnqualifiedId::IK_ConstructorName: 3171 case UnqualifiedId::IK_ConstructorTemplateId: 3172 // C++0x inherited constructors. 3173 if (getLangOptions().CPlusPlus0x) break; 3174 3175 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3176 << SS.getRange(); 3177 return DeclPtrTy(); 3178 3179 case UnqualifiedId::IK_DestructorName: 3180 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3181 << SS.getRange(); 3182 return DeclPtrTy(); 3183 3184 case UnqualifiedId::IK_TemplateId: 3185 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3186 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3187 return DeclPtrTy(); 3188 } 3189 3190 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3191 if (!TargetName) 3192 return DeclPtrTy(); 3193 3194 // Warn about using declarations. 3195 // TODO: store that the declaration was written without 'using' and 3196 // talk about access decls instead of using decls in the 3197 // diagnostics. 3198 if (!HasUsingKeyword) { 3199 UsingLoc = Name.getSourceRange().getBegin(); 3200 3201 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3202 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3203 } 3204 3205 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3206 Name.getSourceRange().getBegin(), 3207 TargetName, AttrList, 3208 /* IsInstantiation */ false, 3209 IsTypeName, TypenameLoc); 3210 if (UD) 3211 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3212 3213 return DeclPtrTy::make(UD); 3214} 3215 3216/// Determines whether to create a using shadow decl for a particular 3217/// decl, given the set of decls existing prior to this using lookup. 3218bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3219 const LookupResult &Previous) { 3220 // Diagnose finding a decl which is not from a base class of the 3221 // current class. We do this now because there are cases where this 3222 // function will silently decide not to build a shadow decl, which 3223 // will pre-empt further diagnostics. 3224 // 3225 // We don't need to do this in C++0x because we do the check once on 3226 // the qualifier. 3227 // 3228 // FIXME: diagnose the following if we care enough: 3229 // struct A { int foo; }; 3230 // struct B : A { using A::foo; }; 3231 // template <class T> struct C : A {}; 3232 // template <class T> struct D : C<T> { using B::foo; } // <--- 3233 // This is invalid (during instantiation) in C++03 because B::foo 3234 // resolves to the using decl in B, which is not a base class of D<T>. 3235 // We can't diagnose it immediately because C<T> is an unknown 3236 // specialization. The UsingShadowDecl in D<T> then points directly 3237 // to A::foo, which will look well-formed when we instantiate. 3238 // The right solution is to not collapse the shadow-decl chain. 3239 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3240 DeclContext *OrigDC = Orig->getDeclContext(); 3241 3242 // Handle enums and anonymous structs. 3243 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3244 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3245 while (OrigRec->isAnonymousStructOrUnion()) 3246 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3247 3248 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3249 if (OrigDC == CurContext) { 3250 Diag(Using->getLocation(), 3251 diag::err_using_decl_nested_name_specifier_is_current_class) 3252 << Using->getNestedNameRange(); 3253 Diag(Orig->getLocation(), diag::note_using_decl_target); 3254 return true; 3255 } 3256 3257 Diag(Using->getNestedNameRange().getBegin(), 3258 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3259 << Using->getTargetNestedNameDecl() 3260 << cast<CXXRecordDecl>(CurContext) 3261 << Using->getNestedNameRange(); 3262 Diag(Orig->getLocation(), diag::note_using_decl_target); 3263 return true; 3264 } 3265 } 3266 3267 if (Previous.empty()) return false; 3268 3269 NamedDecl *Target = Orig; 3270 if (isa<UsingShadowDecl>(Target)) 3271 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3272 3273 // If the target happens to be one of the previous declarations, we 3274 // don't have a conflict. 3275 // 3276 // FIXME: but we might be increasing its access, in which case we 3277 // should redeclare it. 3278 NamedDecl *NonTag = 0, *Tag = 0; 3279 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3280 I != E; ++I) { 3281 NamedDecl *D = (*I)->getUnderlyingDecl(); 3282 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3283 return false; 3284 3285 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3286 } 3287 3288 if (Target->isFunctionOrFunctionTemplate()) { 3289 FunctionDecl *FD; 3290 if (isa<FunctionTemplateDecl>(Target)) 3291 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3292 else 3293 FD = cast<FunctionDecl>(Target); 3294 3295 NamedDecl *OldDecl = 0; 3296 switch (CheckOverload(FD, Previous, OldDecl)) { 3297 case Ovl_Overload: 3298 return false; 3299 3300 case Ovl_NonFunction: 3301 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3302 break; 3303 3304 // We found a decl with the exact signature. 3305 case Ovl_Match: 3306 if (isa<UsingShadowDecl>(OldDecl)) { 3307 // Silently ignore the possible conflict. 3308 return false; 3309 } 3310 3311 // If we're in a record, we want to hide the target, so we 3312 // return true (without a diagnostic) to tell the caller not to 3313 // build a shadow decl. 3314 if (CurContext->isRecord()) 3315 return true; 3316 3317 // If we're not in a record, this is an error. 3318 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3319 break; 3320 } 3321 3322 Diag(Target->getLocation(), diag::note_using_decl_target); 3323 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3324 return true; 3325 } 3326 3327 // Target is not a function. 3328 3329 if (isa<TagDecl>(Target)) { 3330 // No conflict between a tag and a non-tag. 3331 if (!Tag) return false; 3332 3333 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3334 Diag(Target->getLocation(), diag::note_using_decl_target); 3335 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3336 return true; 3337 } 3338 3339 // No conflict between a tag and a non-tag. 3340 if (!NonTag) return false; 3341 3342 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3343 Diag(Target->getLocation(), diag::note_using_decl_target); 3344 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3345 return true; 3346} 3347 3348/// Builds a shadow declaration corresponding to a 'using' declaration. 3349UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3350 UsingDecl *UD, 3351 NamedDecl *Orig) { 3352 3353 // If we resolved to another shadow declaration, just coalesce them. 3354 NamedDecl *Target = Orig; 3355 if (isa<UsingShadowDecl>(Target)) { 3356 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3357 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3358 } 3359 3360 UsingShadowDecl *Shadow 3361 = UsingShadowDecl::Create(Context, CurContext, 3362 UD->getLocation(), UD, Target); 3363 UD->addShadowDecl(Shadow); 3364 3365 if (S) 3366 PushOnScopeChains(Shadow, S); 3367 else 3368 CurContext->addDecl(Shadow); 3369 Shadow->setAccess(UD->getAccess()); 3370 3371 // Register it as a conversion if appropriate. 3372 if (Shadow->getDeclName().getNameKind() 3373 == DeclarationName::CXXConversionFunctionName) 3374 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3375 3376 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3377 Shadow->setInvalidDecl(); 3378 3379 return Shadow; 3380} 3381 3382/// Hides a using shadow declaration. This is required by the current 3383/// using-decl implementation when a resolvable using declaration in a 3384/// class is followed by a declaration which would hide or override 3385/// one or more of the using decl's targets; for example: 3386/// 3387/// struct Base { void foo(int); }; 3388/// struct Derived : Base { 3389/// using Base::foo; 3390/// void foo(int); 3391/// }; 3392/// 3393/// The governing language is C++03 [namespace.udecl]p12: 3394/// 3395/// When a using-declaration brings names from a base class into a 3396/// derived class scope, member functions in the derived class 3397/// override and/or hide member functions with the same name and 3398/// parameter types in a base class (rather than conflicting). 3399/// 3400/// There are two ways to implement this: 3401/// (1) optimistically create shadow decls when they're not hidden 3402/// by existing declarations, or 3403/// (2) don't create any shadow decls (or at least don't make them 3404/// visible) until we've fully parsed/instantiated the class. 3405/// The problem with (1) is that we might have to retroactively remove 3406/// a shadow decl, which requires several O(n) operations because the 3407/// decl structures are (very reasonably) not designed for removal. 3408/// (2) avoids this but is very fiddly and phase-dependent. 3409void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3410 if (Shadow->getDeclName().getNameKind() == 3411 DeclarationName::CXXConversionFunctionName) 3412 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3413 3414 // Remove it from the DeclContext... 3415 Shadow->getDeclContext()->removeDecl(Shadow); 3416 3417 // ...and the scope, if applicable... 3418 if (S) { 3419 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3420 IdResolver.RemoveDecl(Shadow); 3421 } 3422 3423 // ...and the using decl. 3424 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3425 3426 // TODO: complain somehow if Shadow was used. It shouldn't 3427 // be possible for this to happen, because...? 3428} 3429 3430/// Builds a using declaration. 3431/// 3432/// \param IsInstantiation - Whether this call arises from an 3433/// instantiation of an unresolved using declaration. We treat 3434/// the lookup differently for these declarations. 3435NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3436 SourceLocation UsingLoc, 3437 CXXScopeSpec &SS, 3438 SourceLocation IdentLoc, 3439 DeclarationName Name, 3440 AttributeList *AttrList, 3441 bool IsInstantiation, 3442 bool IsTypeName, 3443 SourceLocation TypenameLoc) { 3444 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3445 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3446 3447 // FIXME: We ignore attributes for now. 3448 delete AttrList; 3449 3450 if (SS.isEmpty()) { 3451 Diag(IdentLoc, diag::err_using_requires_qualname); 3452 return 0; 3453 } 3454 3455 // Do the redeclaration lookup in the current scope. 3456 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3457 ForRedeclaration); 3458 Previous.setHideTags(false); 3459 if (S) { 3460 LookupName(Previous, S); 3461 3462 // It is really dumb that we have to do this. 3463 LookupResult::Filter F = Previous.makeFilter(); 3464 while (F.hasNext()) { 3465 NamedDecl *D = F.next(); 3466 if (!isDeclInScope(D, CurContext, S)) 3467 F.erase(); 3468 } 3469 F.done(); 3470 } else { 3471 assert(IsInstantiation && "no scope in non-instantiation"); 3472 assert(CurContext->isRecord() && "scope not record in instantiation"); 3473 LookupQualifiedName(Previous, CurContext); 3474 } 3475 3476 NestedNameSpecifier *NNS = 3477 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3478 3479 // Check for invalid redeclarations. 3480 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3481 return 0; 3482 3483 // Check for bad qualifiers. 3484 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3485 return 0; 3486 3487 DeclContext *LookupContext = computeDeclContext(SS); 3488 NamedDecl *D; 3489 if (!LookupContext) { 3490 if (IsTypeName) { 3491 // FIXME: not all declaration name kinds are legal here 3492 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3493 UsingLoc, TypenameLoc, 3494 SS.getRange(), NNS, 3495 IdentLoc, Name); 3496 } else { 3497 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3498 UsingLoc, SS.getRange(), NNS, 3499 IdentLoc, Name); 3500 } 3501 } else { 3502 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3503 SS.getRange(), UsingLoc, NNS, Name, 3504 IsTypeName); 3505 } 3506 D->setAccess(AS); 3507 CurContext->addDecl(D); 3508 3509 if (!LookupContext) return D; 3510 UsingDecl *UD = cast<UsingDecl>(D); 3511 3512 if (RequireCompleteDeclContext(SS)) { 3513 UD->setInvalidDecl(); 3514 return UD; 3515 } 3516 3517 // Look up the target name. 3518 3519 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3520 3521 // Unlike most lookups, we don't always want to hide tag 3522 // declarations: tag names are visible through the using declaration 3523 // even if hidden by ordinary names, *except* in a dependent context 3524 // where it's important for the sanity of two-phase lookup. 3525 if (!IsInstantiation) 3526 R.setHideTags(false); 3527 3528 LookupQualifiedName(R, LookupContext); 3529 3530 if (R.empty()) { 3531 Diag(IdentLoc, diag::err_no_member) 3532 << Name << LookupContext << SS.getRange(); 3533 UD->setInvalidDecl(); 3534 return UD; 3535 } 3536 3537 if (R.isAmbiguous()) { 3538 UD->setInvalidDecl(); 3539 return UD; 3540 } 3541 3542 if (IsTypeName) { 3543 // If we asked for a typename and got a non-type decl, error out. 3544 if (!R.getAsSingle<TypeDecl>()) { 3545 Diag(IdentLoc, diag::err_using_typename_non_type); 3546 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3547 Diag((*I)->getUnderlyingDecl()->getLocation(), 3548 diag::note_using_decl_target); 3549 UD->setInvalidDecl(); 3550 return UD; 3551 } 3552 } else { 3553 // If we asked for a non-typename and we got a type, error out, 3554 // but only if this is an instantiation of an unresolved using 3555 // decl. Otherwise just silently find the type name. 3556 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3557 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3558 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3559 UD->setInvalidDecl(); 3560 return UD; 3561 } 3562 } 3563 3564 // C++0x N2914 [namespace.udecl]p6: 3565 // A using-declaration shall not name a namespace. 3566 if (R.getAsSingle<NamespaceDecl>()) { 3567 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3568 << SS.getRange(); 3569 UD->setInvalidDecl(); 3570 return UD; 3571 } 3572 3573 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3574 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3575 BuildUsingShadowDecl(S, UD, *I); 3576 } 3577 3578 return UD; 3579} 3580 3581/// Checks that the given using declaration is not an invalid 3582/// redeclaration. Note that this is checking only for the using decl 3583/// itself, not for any ill-formedness among the UsingShadowDecls. 3584bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3585 bool isTypeName, 3586 const CXXScopeSpec &SS, 3587 SourceLocation NameLoc, 3588 const LookupResult &Prev) { 3589 // C++03 [namespace.udecl]p8: 3590 // C++0x [namespace.udecl]p10: 3591 // A using-declaration is a declaration and can therefore be used 3592 // repeatedly where (and only where) multiple declarations are 3593 // allowed. 3594 // That's only in file contexts. 3595 if (CurContext->getLookupContext()->isFileContext()) 3596 return false; 3597 3598 NestedNameSpecifier *Qual 3599 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3600 3601 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3602 NamedDecl *D = *I; 3603 3604 bool DTypename; 3605 NestedNameSpecifier *DQual; 3606 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3607 DTypename = UD->isTypeName(); 3608 DQual = UD->getTargetNestedNameDecl(); 3609 } else if (UnresolvedUsingValueDecl *UD 3610 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3611 DTypename = false; 3612 DQual = UD->getTargetNestedNameSpecifier(); 3613 } else if (UnresolvedUsingTypenameDecl *UD 3614 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3615 DTypename = true; 3616 DQual = UD->getTargetNestedNameSpecifier(); 3617 } else continue; 3618 3619 // using decls differ if one says 'typename' and the other doesn't. 3620 // FIXME: non-dependent using decls? 3621 if (isTypeName != DTypename) continue; 3622 3623 // using decls differ if they name different scopes (but note that 3624 // template instantiation can cause this check to trigger when it 3625 // didn't before instantiation). 3626 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3627 Context.getCanonicalNestedNameSpecifier(DQual)) 3628 continue; 3629 3630 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3631 Diag(D->getLocation(), diag::note_using_decl) << 1; 3632 return true; 3633 } 3634 3635 return false; 3636} 3637 3638 3639/// Checks that the given nested-name qualifier used in a using decl 3640/// in the current context is appropriately related to the current 3641/// scope. If an error is found, diagnoses it and returns true. 3642bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3643 const CXXScopeSpec &SS, 3644 SourceLocation NameLoc) { 3645 DeclContext *NamedContext = computeDeclContext(SS); 3646 3647 if (!CurContext->isRecord()) { 3648 // C++03 [namespace.udecl]p3: 3649 // C++0x [namespace.udecl]p8: 3650 // A using-declaration for a class member shall be a member-declaration. 3651 3652 // If we weren't able to compute a valid scope, it must be a 3653 // dependent class scope. 3654 if (!NamedContext || NamedContext->isRecord()) { 3655 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3656 << SS.getRange(); 3657 return true; 3658 } 3659 3660 // Otherwise, everything is known to be fine. 3661 return false; 3662 } 3663 3664 // The current scope is a record. 3665 3666 // If the named context is dependent, we can't decide much. 3667 if (!NamedContext) { 3668 // FIXME: in C++0x, we can diagnose if we can prove that the 3669 // nested-name-specifier does not refer to a base class, which is 3670 // still possible in some cases. 3671 3672 // Otherwise we have to conservatively report that things might be 3673 // okay. 3674 return false; 3675 } 3676 3677 if (!NamedContext->isRecord()) { 3678 // Ideally this would point at the last name in the specifier, 3679 // but we don't have that level of source info. 3680 Diag(SS.getRange().getBegin(), 3681 diag::err_using_decl_nested_name_specifier_is_not_class) 3682 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3683 return true; 3684 } 3685 3686 if (getLangOptions().CPlusPlus0x) { 3687 // C++0x [namespace.udecl]p3: 3688 // In a using-declaration used as a member-declaration, the 3689 // nested-name-specifier shall name a base class of the class 3690 // being defined. 3691 3692 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3693 cast<CXXRecordDecl>(NamedContext))) { 3694 if (CurContext == NamedContext) { 3695 Diag(NameLoc, 3696 diag::err_using_decl_nested_name_specifier_is_current_class) 3697 << SS.getRange(); 3698 return true; 3699 } 3700 3701 Diag(SS.getRange().getBegin(), 3702 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3703 << (NestedNameSpecifier*) SS.getScopeRep() 3704 << cast<CXXRecordDecl>(CurContext) 3705 << SS.getRange(); 3706 return true; 3707 } 3708 3709 return false; 3710 } 3711 3712 // C++03 [namespace.udecl]p4: 3713 // A using-declaration used as a member-declaration shall refer 3714 // to a member of a base class of the class being defined [etc.]. 3715 3716 // Salient point: SS doesn't have to name a base class as long as 3717 // lookup only finds members from base classes. Therefore we can 3718 // diagnose here only if we can prove that that can't happen, 3719 // i.e. if the class hierarchies provably don't intersect. 3720 3721 // TODO: it would be nice if "definitely valid" results were cached 3722 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3723 // need to be repeated. 3724 3725 struct UserData { 3726 llvm::DenseSet<const CXXRecordDecl*> Bases; 3727 3728 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3729 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3730 Data->Bases.insert(Base); 3731 return true; 3732 } 3733 3734 bool hasDependentBases(const CXXRecordDecl *Class) { 3735 return !Class->forallBases(collect, this); 3736 } 3737 3738 /// Returns true if the base is dependent or is one of the 3739 /// accumulated base classes. 3740 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3741 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3742 return !Data->Bases.count(Base); 3743 } 3744 3745 bool mightShareBases(const CXXRecordDecl *Class) { 3746 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3747 } 3748 }; 3749 3750 UserData Data; 3751 3752 // Returns false if we find a dependent base. 3753 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3754 return false; 3755 3756 // Returns false if the class has a dependent base or if it or one 3757 // of its bases is present in the base set of the current context. 3758 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3759 return false; 3760 3761 Diag(SS.getRange().getBegin(), 3762 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3763 << (NestedNameSpecifier*) SS.getScopeRep() 3764 << cast<CXXRecordDecl>(CurContext) 3765 << SS.getRange(); 3766 3767 return true; 3768} 3769 3770Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3771 SourceLocation NamespaceLoc, 3772 SourceLocation AliasLoc, 3773 IdentifierInfo *Alias, 3774 CXXScopeSpec &SS, 3775 SourceLocation IdentLoc, 3776 IdentifierInfo *Ident) { 3777 3778 // Lookup the namespace name. 3779 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3780 LookupParsedName(R, S, &SS); 3781 3782 // Check if we have a previous declaration with the same name. 3783 if (NamedDecl *PrevDecl 3784 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3785 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3786 // We already have an alias with the same name that points to the same 3787 // namespace, so don't create a new one. 3788 // FIXME: At some point, we'll want to create the (redundant) 3789 // declaration to maintain better source information. 3790 if (!R.isAmbiguous() && !R.empty() && 3791 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3792 return DeclPtrTy(); 3793 } 3794 3795 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3796 diag::err_redefinition_different_kind; 3797 Diag(AliasLoc, DiagID) << Alias; 3798 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3799 return DeclPtrTy(); 3800 } 3801 3802 if (R.isAmbiguous()) 3803 return DeclPtrTy(); 3804 3805 if (R.empty()) { 3806 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3807 return DeclPtrTy(); 3808 } 3809 3810 NamespaceAliasDecl *AliasDecl = 3811 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3812 Alias, SS.getRange(), 3813 (NestedNameSpecifier *)SS.getScopeRep(), 3814 IdentLoc, R.getFoundDecl()); 3815 3816 PushOnScopeChains(AliasDecl, S); 3817 return DeclPtrTy::make(AliasDecl); 3818} 3819 3820void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3821 CXXConstructorDecl *Constructor) { 3822 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3823 !Constructor->isUsed()) && 3824 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3825 3826 CXXRecordDecl *ClassDecl 3827 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3828 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3829 3830 DeclContext *PreviousContext = CurContext; 3831 CurContext = Constructor; 3832 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3833 Diag(CurrentLocation, diag::note_member_synthesized_at) 3834 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3835 Constructor->setInvalidDecl(); 3836 } else { 3837 Constructor->setUsed(); 3838 } 3839 CurContext = PreviousContext; 3840} 3841 3842void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3843 CXXDestructorDecl *Destructor) { 3844 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3845 "DefineImplicitDestructor - call it for implicit default dtor"); 3846 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3847 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3848 3849 DeclContext *PreviousContext = CurContext; 3850 CurContext = Destructor; 3851 3852 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3853 Destructor->getParent()); 3854 3855 // FIXME: If CheckDestructor fails, we should emit a note about where the 3856 // implicit destructor was needed. 3857 if (CheckDestructor(Destructor)) { 3858 Diag(CurrentLocation, diag::note_member_synthesized_at) 3859 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3860 3861 Destructor->setInvalidDecl(); 3862 CurContext = PreviousContext; 3863 3864 return; 3865 } 3866 CurContext = PreviousContext; 3867 3868 Destructor->setUsed(); 3869} 3870 3871void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3872 CXXMethodDecl *MethodDecl) { 3873 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3874 MethodDecl->getOverloadedOperator() == OO_Equal && 3875 !MethodDecl->isUsed()) && 3876 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3877 3878 CXXRecordDecl *ClassDecl 3879 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3880 3881 DeclContext *PreviousContext = CurContext; 3882 CurContext = MethodDecl; 3883 3884 // C++[class.copy] p12 3885 // Before the implicitly-declared copy assignment operator for a class is 3886 // implicitly defined, all implicitly-declared copy assignment operators 3887 // for its direct base classes and its nonstatic data members shall have 3888 // been implicitly defined. 3889 bool err = false; 3890 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3891 E = ClassDecl->bases_end(); Base != E; ++Base) { 3892 CXXRecordDecl *BaseClassDecl 3893 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3894 if (CXXMethodDecl *BaseAssignOpMethod = 3895 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3896 BaseClassDecl)) { 3897 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3898 BaseAssignOpMethod, 3899 PDiag(diag::err_access_assign_base) 3900 << Base->getType()); 3901 3902 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3903 } 3904 } 3905 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3906 E = ClassDecl->field_end(); Field != E; ++Field) { 3907 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3908 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3909 FieldType = Array->getElementType(); 3910 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3911 CXXRecordDecl *FieldClassDecl 3912 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3913 if (CXXMethodDecl *FieldAssignOpMethod = 3914 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3915 FieldClassDecl)) { 3916 CheckDirectMemberAccess(Field->getLocation(), 3917 FieldAssignOpMethod, 3918 PDiag(diag::err_access_assign_field) 3919 << Field->getDeclName() << Field->getType()); 3920 3921 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3922 } 3923 } else if (FieldType->isReferenceType()) { 3924 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3925 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3926 Diag(Field->getLocation(), diag::note_declared_at); 3927 Diag(CurrentLocation, diag::note_first_required_here); 3928 err = true; 3929 } else if (FieldType.isConstQualified()) { 3930 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3931 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3932 Diag(Field->getLocation(), diag::note_declared_at); 3933 Diag(CurrentLocation, diag::note_first_required_here); 3934 err = true; 3935 } 3936 } 3937 if (!err) 3938 MethodDecl->setUsed(); 3939 3940 CurContext = PreviousContext; 3941} 3942 3943CXXMethodDecl * 3944Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3945 ParmVarDecl *ParmDecl, 3946 CXXRecordDecl *ClassDecl) { 3947 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3948 QualType RHSType(LHSType); 3949 // If class's assignment operator argument is const/volatile qualified, 3950 // look for operator = (const/volatile B&). Otherwise, look for 3951 // operator = (B&). 3952 RHSType = Context.getCVRQualifiedType(RHSType, 3953 ParmDecl->getType().getCVRQualifiers()); 3954 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3955 LHSType, 3956 SourceLocation())); 3957 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3958 RHSType, 3959 CurrentLocation)); 3960 Expr *Args[2] = { &*LHS, &*RHS }; 3961 OverloadCandidateSet CandidateSet(CurrentLocation); 3962 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3963 CandidateSet); 3964 OverloadCandidateSet::iterator Best; 3965 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3966 return cast<CXXMethodDecl>(Best->Function); 3967 assert(false && 3968 "getAssignOperatorMethod - copy assignment operator method not found"); 3969 return 0; 3970} 3971 3972void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3973 CXXConstructorDecl *CopyConstructor, 3974 unsigned TypeQuals) { 3975 assert((CopyConstructor->isImplicit() && 3976 CopyConstructor->isCopyConstructor(TypeQuals) && 3977 !CopyConstructor->isUsed()) && 3978 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3979 3980 CXXRecordDecl *ClassDecl 3981 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3982 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3983 3984 DeclContext *PreviousContext = CurContext; 3985 CurContext = CopyConstructor; 3986 3987 // C++ [class.copy] p209 3988 // Before the implicitly-declared copy constructor for a class is 3989 // implicitly defined, all the implicitly-declared copy constructors 3990 // for its base class and its non-static data members shall have been 3991 // implicitly defined. 3992 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3993 Base != ClassDecl->bases_end(); ++Base) { 3994 CXXRecordDecl *BaseClassDecl 3995 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3996 if (CXXConstructorDecl *BaseCopyCtor = 3997 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3998 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3999 BaseCopyCtor, 4000 PDiag(diag::err_access_copy_base) 4001 << Base->getType()); 4002 4003 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4004 } 4005 } 4006 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4007 FieldEnd = ClassDecl->field_end(); 4008 Field != FieldEnd; ++Field) { 4009 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4010 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4011 FieldType = Array->getElementType(); 4012 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4013 CXXRecordDecl *FieldClassDecl 4014 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4015 if (CXXConstructorDecl *FieldCopyCtor = 4016 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4017 CheckDirectMemberAccess(Field->getLocation(), 4018 FieldCopyCtor, 4019 PDiag(diag::err_access_copy_field) 4020 << Field->getDeclName() << Field->getType()); 4021 4022 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4023 } 4024 } 4025 } 4026 CopyConstructor->setUsed(); 4027 4028 CurContext = PreviousContext; 4029} 4030 4031Sema::OwningExprResult 4032Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4033 CXXConstructorDecl *Constructor, 4034 MultiExprArg ExprArgs, 4035 bool RequiresZeroInit, 4036 bool BaseInitialization) { 4037 bool Elidable = false; 4038 4039 // C++0x [class.copy]p34: 4040 // When certain criteria are met, an implementation is allowed to 4041 // omit the copy/move construction of a class object, even if the 4042 // copy/move constructor and/or destructor for the object have 4043 // side effects. [...] 4044 // - when a temporary class object that has not been bound to a 4045 // reference (12.2) would be copied/moved to a class object 4046 // with the same cv-unqualified type, the copy/move operation 4047 // can be omitted by constructing the temporary object 4048 // directly into the target of the omitted copy/move 4049 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4050 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4051 Elidable = SubExpr->isTemporaryObject() && 4052 Context.hasSameUnqualifiedType(SubExpr->getType(), 4053 Context.getTypeDeclType(Constructor->getParent())); 4054 } 4055 4056 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4057 Elidable, move(ExprArgs), RequiresZeroInit, 4058 BaseInitialization); 4059} 4060 4061/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4062/// including handling of its default argument expressions. 4063Sema::OwningExprResult 4064Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4065 CXXConstructorDecl *Constructor, bool Elidable, 4066 MultiExprArg ExprArgs, 4067 bool RequiresZeroInit, 4068 bool BaseInitialization) { 4069 unsigned NumExprs = ExprArgs.size(); 4070 Expr **Exprs = (Expr **)ExprArgs.release(); 4071 4072 MarkDeclarationReferenced(ConstructLoc, Constructor); 4073 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4074 Constructor, Elidable, Exprs, NumExprs, 4075 RequiresZeroInit, BaseInitialization)); 4076} 4077 4078bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4079 CXXConstructorDecl *Constructor, 4080 MultiExprArg Exprs) { 4081 OwningExprResult TempResult = 4082 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4083 move(Exprs)); 4084 if (TempResult.isInvalid()) 4085 return true; 4086 4087 Expr *Temp = TempResult.takeAs<Expr>(); 4088 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4089 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4090 VD->setInit(Temp); 4091 4092 return false; 4093} 4094 4095void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4096 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4097 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4098 !ClassDecl->hasTrivialDestructor()) { 4099 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4100 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4101 CheckDestructorAccess(VD->getLocation(), Destructor, 4102 PDiag(diag::err_access_dtor_var) 4103 << VD->getDeclName() 4104 << VD->getType()); 4105 } 4106} 4107 4108/// AddCXXDirectInitializerToDecl - This action is called immediately after 4109/// ActOnDeclarator, when a C++ direct initializer is present. 4110/// e.g: "int x(1);" 4111void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4112 SourceLocation LParenLoc, 4113 MultiExprArg Exprs, 4114 SourceLocation *CommaLocs, 4115 SourceLocation RParenLoc) { 4116 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4117 Decl *RealDecl = Dcl.getAs<Decl>(); 4118 4119 // If there is no declaration, there was an error parsing it. Just ignore 4120 // the initializer. 4121 if (RealDecl == 0) 4122 return; 4123 4124 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4125 if (!VDecl) { 4126 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4127 RealDecl->setInvalidDecl(); 4128 return; 4129 } 4130 4131 // We will represent direct-initialization similarly to copy-initialization: 4132 // int x(1); -as-> int x = 1; 4133 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4134 // 4135 // Clients that want to distinguish between the two forms, can check for 4136 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4137 // A major benefit is that clients that don't particularly care about which 4138 // exactly form was it (like the CodeGen) can handle both cases without 4139 // special case code. 4140 4141 // C++ 8.5p11: 4142 // The form of initialization (using parentheses or '=') is generally 4143 // insignificant, but does matter when the entity being initialized has a 4144 // class type. 4145 QualType DeclInitType = VDecl->getType(); 4146 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4147 DeclInitType = Context.getBaseElementType(Array); 4148 4149 if (!VDecl->getType()->isDependentType() && 4150 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4151 diag::err_typecheck_decl_incomplete_type)) { 4152 VDecl->setInvalidDecl(); 4153 return; 4154 } 4155 4156 // The variable can not have an abstract class type. 4157 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4158 diag::err_abstract_type_in_decl, 4159 AbstractVariableType)) 4160 VDecl->setInvalidDecl(); 4161 4162 const VarDecl *Def; 4163 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4164 Diag(VDecl->getLocation(), diag::err_redefinition) 4165 << VDecl->getDeclName(); 4166 Diag(Def->getLocation(), diag::note_previous_definition); 4167 VDecl->setInvalidDecl(); 4168 return; 4169 } 4170 4171 // If either the declaration has a dependent type or if any of the 4172 // expressions is type-dependent, we represent the initialization 4173 // via a ParenListExpr for later use during template instantiation. 4174 if (VDecl->getType()->isDependentType() || 4175 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4176 // Let clients know that initialization was done with a direct initializer. 4177 VDecl->setCXXDirectInitializer(true); 4178 4179 // Store the initialization expressions as a ParenListExpr. 4180 unsigned NumExprs = Exprs.size(); 4181 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4182 (Expr **)Exprs.release(), 4183 NumExprs, RParenLoc)); 4184 return; 4185 } 4186 4187 // Capture the variable that is being initialized and the style of 4188 // initialization. 4189 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4190 4191 // FIXME: Poor source location information. 4192 InitializationKind Kind 4193 = InitializationKind::CreateDirect(VDecl->getLocation(), 4194 LParenLoc, RParenLoc); 4195 4196 InitializationSequence InitSeq(*this, Entity, Kind, 4197 (Expr**)Exprs.get(), Exprs.size()); 4198 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4199 if (Result.isInvalid()) { 4200 VDecl->setInvalidDecl(); 4201 return; 4202 } 4203 4204 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4205 VDecl->setInit(Result.takeAs<Expr>()); 4206 VDecl->setCXXDirectInitializer(true); 4207 4208 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4209 FinalizeVarWithDestructor(VDecl, Record); 4210} 4211 4212/// \brief Add the applicable constructor candidates for an initialization 4213/// by constructor. 4214static void AddConstructorInitializationCandidates(Sema &SemaRef, 4215 QualType ClassType, 4216 Expr **Args, 4217 unsigned NumArgs, 4218 InitializationKind Kind, 4219 OverloadCandidateSet &CandidateSet) { 4220 // C++ [dcl.init]p14: 4221 // If the initialization is direct-initialization, or if it is 4222 // copy-initialization where the cv-unqualified version of the 4223 // source type is the same class as, or a derived class of, the 4224 // class of the destination, constructors are considered. The 4225 // applicable constructors are enumerated (13.3.1.3), and the 4226 // best one is chosen through overload resolution (13.3). The 4227 // constructor so selected is called to initialize the object, 4228 // with the initializer expression(s) as its argument(s). If no 4229 // constructor applies, or the overload resolution is ambiguous, 4230 // the initialization is ill-formed. 4231 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4232 assert(ClassRec && "Can only initialize a class type here"); 4233 4234 // FIXME: When we decide not to synthesize the implicitly-declared 4235 // constructors, we'll need to make them appear here. 4236 4237 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4238 DeclarationName ConstructorName 4239 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4240 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4241 DeclContext::lookup_const_iterator Con, ConEnd; 4242 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4243 Con != ConEnd; ++Con) { 4244 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4245 4246 // Find the constructor (which may be a template). 4247 CXXConstructorDecl *Constructor = 0; 4248 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4249 if (ConstructorTmpl) 4250 Constructor 4251 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4252 else 4253 Constructor = cast<CXXConstructorDecl>(*Con); 4254 4255 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4256 (Kind.getKind() == InitializationKind::IK_Value) || 4257 (Kind.getKind() == InitializationKind::IK_Copy && 4258 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4259 ((Kind.getKind() == InitializationKind::IK_Default) && 4260 Constructor->isDefaultConstructor())) { 4261 if (ConstructorTmpl) 4262 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4263 /*ExplicitArgs*/ 0, 4264 Args, NumArgs, CandidateSet); 4265 else 4266 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4267 Args, NumArgs, CandidateSet); 4268 } 4269 } 4270} 4271 4272/// \brief Attempt to perform initialization by constructor 4273/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4274/// copy-initialization. 4275/// 4276/// This routine determines whether initialization by constructor is possible, 4277/// but it does not emit any diagnostics in the case where the initialization 4278/// is ill-formed. 4279/// 4280/// \param ClassType the type of the object being initialized, which must have 4281/// class type. 4282/// 4283/// \param Args the arguments provided to initialize the object 4284/// 4285/// \param NumArgs the number of arguments provided to initialize the object 4286/// 4287/// \param Kind the type of initialization being performed 4288/// 4289/// \returns the constructor used to initialize the object, if successful. 4290/// Otherwise, emits a diagnostic and returns NULL. 4291CXXConstructorDecl * 4292Sema::TryInitializationByConstructor(QualType ClassType, 4293 Expr **Args, unsigned NumArgs, 4294 SourceLocation Loc, 4295 InitializationKind Kind) { 4296 // Build the overload candidate set 4297 OverloadCandidateSet CandidateSet(Loc); 4298 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4299 CandidateSet); 4300 4301 // Determine whether we found a constructor we can use. 4302 OverloadCandidateSet::iterator Best; 4303 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4304 case OR_Success: 4305 case OR_Deleted: 4306 // We found a constructor. Return it. 4307 return cast<CXXConstructorDecl>(Best->Function); 4308 4309 case OR_No_Viable_Function: 4310 case OR_Ambiguous: 4311 // Overload resolution failed. Return nothing. 4312 return 0; 4313 } 4314 4315 // Silence GCC warning 4316 return 0; 4317} 4318 4319/// \brief Given a constructor and the set of arguments provided for the 4320/// constructor, convert the arguments and add any required default arguments 4321/// to form a proper call to this constructor. 4322/// 4323/// \returns true if an error occurred, false otherwise. 4324bool 4325Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4326 MultiExprArg ArgsPtr, 4327 SourceLocation Loc, 4328 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4329 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4330 unsigned NumArgs = ArgsPtr.size(); 4331 Expr **Args = (Expr **)ArgsPtr.get(); 4332 4333 const FunctionProtoType *Proto 4334 = Constructor->getType()->getAs<FunctionProtoType>(); 4335 assert(Proto && "Constructor without a prototype?"); 4336 unsigned NumArgsInProto = Proto->getNumArgs(); 4337 4338 // If too few arguments are available, we'll fill in the rest with defaults. 4339 if (NumArgs < NumArgsInProto) 4340 ConvertedArgs.reserve(NumArgsInProto); 4341 else 4342 ConvertedArgs.reserve(NumArgs); 4343 4344 VariadicCallType CallType = 4345 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4346 llvm::SmallVector<Expr *, 8> AllArgs; 4347 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4348 Proto, 0, Args, NumArgs, AllArgs, 4349 CallType); 4350 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4351 ConvertedArgs.push_back(AllArgs[i]); 4352 return Invalid; 4353} 4354 4355/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4356/// determine whether they are reference-related, 4357/// reference-compatible, reference-compatible with added 4358/// qualification, or incompatible, for use in C++ initialization by 4359/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4360/// type, and the first type (T1) is the pointee type of the reference 4361/// type being initialized. 4362Sema::ReferenceCompareResult 4363Sema::CompareReferenceRelationship(SourceLocation Loc, 4364 QualType OrigT1, QualType OrigT2, 4365 bool& DerivedToBase) { 4366 assert(!OrigT1->isReferenceType() && 4367 "T1 must be the pointee type of the reference type"); 4368 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4369 4370 QualType T1 = Context.getCanonicalType(OrigT1); 4371 QualType T2 = Context.getCanonicalType(OrigT2); 4372 Qualifiers T1Quals, T2Quals; 4373 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4374 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4375 4376 // C++ [dcl.init.ref]p4: 4377 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4378 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4379 // T1 is a base class of T2. 4380 if (UnqualT1 == UnqualT2) 4381 DerivedToBase = false; 4382 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4383 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4384 IsDerivedFrom(UnqualT2, UnqualT1)) 4385 DerivedToBase = true; 4386 else 4387 return Ref_Incompatible; 4388 4389 // At this point, we know that T1 and T2 are reference-related (at 4390 // least). 4391 4392 // If the type is an array type, promote the element qualifiers to the type 4393 // for comparison. 4394 if (isa<ArrayType>(T1) && T1Quals) 4395 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4396 if (isa<ArrayType>(T2) && T2Quals) 4397 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4398 4399 // C++ [dcl.init.ref]p4: 4400 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4401 // reference-related to T2 and cv1 is the same cv-qualification 4402 // as, or greater cv-qualification than, cv2. For purposes of 4403 // overload resolution, cases for which cv1 is greater 4404 // cv-qualification than cv2 are identified as 4405 // reference-compatible with added qualification (see 13.3.3.2). 4406 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4407 return Ref_Compatible; 4408 else if (T1.isMoreQualifiedThan(T2)) 4409 return Ref_Compatible_With_Added_Qualification; 4410 else 4411 return Ref_Related; 4412} 4413 4414/// CheckReferenceInit - Check the initialization of a reference 4415/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4416/// the initializer (either a simple initializer or an initializer 4417/// list), and DeclType is the type of the declaration. When ICS is 4418/// non-null, this routine will compute the implicit conversion 4419/// sequence according to C++ [over.ics.ref] and will not produce any 4420/// diagnostics; when ICS is null, it will emit diagnostics when any 4421/// errors are found. Either way, a return value of true indicates 4422/// that there was a failure, a return value of false indicates that 4423/// the reference initialization succeeded. 4424/// 4425/// When @p SuppressUserConversions, user-defined conversions are 4426/// suppressed. 4427/// When @p AllowExplicit, we also permit explicit user-defined 4428/// conversion functions. 4429/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4430/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4431/// This is used when this is called from a C-style cast. 4432bool 4433Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4434 SourceLocation DeclLoc, 4435 bool SuppressUserConversions, 4436 bool AllowExplicit, bool ForceRValue, 4437 ImplicitConversionSequence *ICS, 4438 bool IgnoreBaseAccess) { 4439 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4440 4441 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4442 QualType T2 = Init->getType(); 4443 4444 // If the initializer is the address of an overloaded function, try 4445 // to resolve the overloaded function. If all goes well, T2 is the 4446 // type of the resulting function. 4447 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4448 DeclAccessPair Found; 4449 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4450 ICS != 0, Found); 4451 if (Fn) { 4452 // Since we're performing this reference-initialization for 4453 // real, update the initializer with the resulting function. 4454 if (!ICS) { 4455 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4456 return true; 4457 4458 CheckAddressOfMemberAccess(Init, Found); 4459 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4460 } 4461 4462 T2 = Fn->getType(); 4463 } 4464 } 4465 4466 // Compute some basic properties of the types and the initializer. 4467 bool isRValRef = DeclType->isRValueReferenceType(); 4468 bool DerivedToBase = false; 4469 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4470 Init->isLvalue(Context); 4471 ReferenceCompareResult RefRelationship 4472 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4473 4474 // Most paths end in a failed conversion. 4475 if (ICS) { 4476 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4477 } 4478 4479 // C++ [dcl.init.ref]p5: 4480 // A reference to type "cv1 T1" is initialized by an expression 4481 // of type "cv2 T2" as follows: 4482 4483 // -- If the initializer expression 4484 4485 // Rvalue references cannot bind to lvalues (N2812). 4486 // There is absolutely no situation where they can. In particular, note that 4487 // this is ill-formed, even if B has a user-defined conversion to A&&: 4488 // B b; 4489 // A&& r = b; 4490 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4491 if (!ICS) 4492 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4493 << Init->getSourceRange(); 4494 return true; 4495 } 4496 4497 bool BindsDirectly = false; 4498 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4499 // reference-compatible with "cv2 T2," or 4500 // 4501 // Note that the bit-field check is skipped if we are just computing 4502 // the implicit conversion sequence (C++ [over.best.ics]p2). 4503 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4504 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4505 BindsDirectly = true; 4506 4507 if (ICS) { 4508 // C++ [over.ics.ref]p1: 4509 // When a parameter of reference type binds directly (8.5.3) 4510 // to an argument expression, the implicit conversion sequence 4511 // is the identity conversion, unless the argument expression 4512 // has a type that is a derived class of the parameter type, 4513 // in which case the implicit conversion sequence is a 4514 // derived-to-base Conversion (13.3.3.1). 4515 ICS->setStandard(); 4516 ICS->Standard.First = ICK_Identity; 4517 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4518 ICS->Standard.Third = ICK_Identity; 4519 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4520 ICS->Standard.setToType(0, T2); 4521 ICS->Standard.setToType(1, T1); 4522 ICS->Standard.setToType(2, T1); 4523 ICS->Standard.ReferenceBinding = true; 4524 ICS->Standard.DirectBinding = true; 4525 ICS->Standard.RRefBinding = false; 4526 ICS->Standard.CopyConstructor = 0; 4527 4528 // Nothing more to do: the inaccessibility/ambiguity check for 4529 // derived-to-base conversions is suppressed when we're 4530 // computing the implicit conversion sequence (C++ 4531 // [over.best.ics]p2). 4532 return false; 4533 } else { 4534 // Perform the conversion. 4535 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4536 if (DerivedToBase) 4537 CK = CastExpr::CK_DerivedToBase; 4538 else if(CheckExceptionSpecCompatibility(Init, T1)) 4539 return true; 4540 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4541 } 4542 } 4543 4544 // -- has a class type (i.e., T2 is a class type) and can be 4545 // implicitly converted to an lvalue of type "cv3 T3," 4546 // where "cv1 T1" is reference-compatible with "cv3 T3" 4547 // 92) (this conversion is selected by enumerating the 4548 // applicable conversion functions (13.3.1.6) and choosing 4549 // the best one through overload resolution (13.3)), 4550 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4551 !RequireCompleteType(DeclLoc, T2, 0)) { 4552 CXXRecordDecl *T2RecordDecl 4553 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4554 4555 OverloadCandidateSet CandidateSet(DeclLoc); 4556 const UnresolvedSetImpl *Conversions 4557 = T2RecordDecl->getVisibleConversionFunctions(); 4558 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4559 E = Conversions->end(); I != E; ++I) { 4560 NamedDecl *D = *I; 4561 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4562 if (isa<UsingShadowDecl>(D)) 4563 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4564 4565 FunctionTemplateDecl *ConvTemplate 4566 = dyn_cast<FunctionTemplateDecl>(D); 4567 CXXConversionDecl *Conv; 4568 if (ConvTemplate) 4569 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4570 else 4571 Conv = cast<CXXConversionDecl>(D); 4572 4573 // If the conversion function doesn't return a reference type, 4574 // it can't be considered for this conversion. 4575 if (Conv->getConversionType()->isLValueReferenceType() && 4576 (AllowExplicit || !Conv->isExplicit())) { 4577 if (ConvTemplate) 4578 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4579 Init, DeclType, CandidateSet); 4580 else 4581 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4582 DeclType, CandidateSet); 4583 } 4584 } 4585 4586 OverloadCandidateSet::iterator Best; 4587 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4588 case OR_Success: 4589 // C++ [over.ics.ref]p1: 4590 // 4591 // [...] If the parameter binds directly to the result of 4592 // applying a conversion function to the argument 4593 // expression, the implicit conversion sequence is a 4594 // user-defined conversion sequence (13.3.3.1.2), with the 4595 // second standard conversion sequence either an identity 4596 // conversion or, if the conversion function returns an 4597 // entity of a type that is a derived class of the parameter 4598 // type, a derived-to-base Conversion. 4599 if (!Best->FinalConversion.DirectBinding) 4600 break; 4601 4602 // This is a direct binding. 4603 BindsDirectly = true; 4604 4605 if (ICS) { 4606 ICS->setUserDefined(); 4607 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4608 ICS->UserDefined.After = Best->FinalConversion; 4609 ICS->UserDefined.ConversionFunction = Best->Function; 4610 ICS->UserDefined.EllipsisConversion = false; 4611 assert(ICS->UserDefined.After.ReferenceBinding && 4612 ICS->UserDefined.After.DirectBinding && 4613 "Expected a direct reference binding!"); 4614 return false; 4615 } else { 4616 OwningExprResult InitConversion = 4617 BuildCXXCastArgument(DeclLoc, QualType(), 4618 CastExpr::CK_UserDefinedConversion, 4619 cast<CXXMethodDecl>(Best->Function), 4620 Owned(Init)); 4621 Init = InitConversion.takeAs<Expr>(); 4622 4623 if (CheckExceptionSpecCompatibility(Init, T1)) 4624 return true; 4625 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4626 /*isLvalue=*/true); 4627 } 4628 break; 4629 4630 case OR_Ambiguous: 4631 if (ICS) { 4632 ICS->setAmbiguous(); 4633 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4634 Cand != CandidateSet.end(); ++Cand) 4635 if (Cand->Viable) 4636 ICS->Ambiguous.addConversion(Cand->Function); 4637 break; 4638 } 4639 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4640 << Init->getSourceRange(); 4641 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4642 return true; 4643 4644 case OR_No_Viable_Function: 4645 case OR_Deleted: 4646 // There was no suitable conversion, or we found a deleted 4647 // conversion; continue with other checks. 4648 break; 4649 } 4650 } 4651 4652 if (BindsDirectly) { 4653 // C++ [dcl.init.ref]p4: 4654 // [...] In all cases where the reference-related or 4655 // reference-compatible relationship of two types is used to 4656 // establish the validity of a reference binding, and T1 is a 4657 // base class of T2, a program that necessitates such a binding 4658 // is ill-formed if T1 is an inaccessible (clause 11) or 4659 // ambiguous (10.2) base class of T2. 4660 // 4661 // Note that we only check this condition when we're allowed to 4662 // complain about errors, because we should not be checking for 4663 // ambiguity (or inaccessibility) unless the reference binding 4664 // actually happens. 4665 if (DerivedToBase) 4666 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4667 Init->getSourceRange(), 4668 IgnoreBaseAccess); 4669 else 4670 return false; 4671 } 4672 4673 // -- Otherwise, the reference shall be to a non-volatile const 4674 // type (i.e., cv1 shall be const), or the reference shall be an 4675 // rvalue reference and the initializer expression shall be an rvalue. 4676 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4677 if (!ICS) 4678 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4679 << T1.isVolatileQualified() 4680 << T1 << int(InitLvalue != Expr::LV_Valid) 4681 << T2 << Init->getSourceRange(); 4682 return true; 4683 } 4684 4685 // -- If the initializer expression is an rvalue, with T2 a 4686 // class type, and "cv1 T1" is reference-compatible with 4687 // "cv2 T2," the reference is bound in one of the 4688 // following ways (the choice is implementation-defined): 4689 // 4690 // -- The reference is bound to the object represented by 4691 // the rvalue (see 3.10) or to a sub-object within that 4692 // object. 4693 // 4694 // -- A temporary of type "cv1 T2" [sic] is created, and 4695 // a constructor is called to copy the entire rvalue 4696 // object into the temporary. The reference is bound to 4697 // the temporary or to a sub-object within the 4698 // temporary. 4699 // 4700 // The constructor that would be used to make the copy 4701 // shall be callable whether or not the copy is actually 4702 // done. 4703 // 4704 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4705 // freedom, so we will always take the first option and never build 4706 // a temporary in this case. FIXME: We will, however, have to check 4707 // for the presence of a copy constructor in C++98/03 mode. 4708 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4709 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4710 if (ICS) { 4711 ICS->setStandard(); 4712 ICS->Standard.First = ICK_Identity; 4713 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4714 ICS->Standard.Third = ICK_Identity; 4715 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4716 ICS->Standard.setToType(0, T2); 4717 ICS->Standard.setToType(1, T1); 4718 ICS->Standard.setToType(2, T1); 4719 ICS->Standard.ReferenceBinding = true; 4720 ICS->Standard.DirectBinding = false; 4721 ICS->Standard.RRefBinding = isRValRef; 4722 ICS->Standard.CopyConstructor = 0; 4723 } else { 4724 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4725 if (DerivedToBase) 4726 CK = CastExpr::CK_DerivedToBase; 4727 else if(CheckExceptionSpecCompatibility(Init, T1)) 4728 return true; 4729 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4730 } 4731 return false; 4732 } 4733 4734 // -- Otherwise, a temporary of type "cv1 T1" is created and 4735 // initialized from the initializer expression using the 4736 // rules for a non-reference copy initialization (8.5). The 4737 // reference is then bound to the temporary. If T1 is 4738 // reference-related to T2, cv1 must be the same 4739 // cv-qualification as, or greater cv-qualification than, 4740 // cv2; otherwise, the program is ill-formed. 4741 if (RefRelationship == Ref_Related) { 4742 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4743 // we would be reference-compatible or reference-compatible with 4744 // added qualification. But that wasn't the case, so the reference 4745 // initialization fails. 4746 if (!ICS) 4747 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4748 << T1 << int(InitLvalue != Expr::LV_Valid) 4749 << T2 << Init->getSourceRange(); 4750 return true; 4751 } 4752 4753 // If at least one of the types is a class type, the types are not 4754 // related, and we aren't allowed any user conversions, the 4755 // reference binding fails. This case is important for breaking 4756 // recursion, since TryImplicitConversion below will attempt to 4757 // create a temporary through the use of a copy constructor. 4758 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4759 (T1->isRecordType() || T2->isRecordType())) { 4760 if (!ICS) 4761 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4762 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4763 return true; 4764 } 4765 4766 // Actually try to convert the initializer to T1. 4767 if (ICS) { 4768 // C++ [over.ics.ref]p2: 4769 // 4770 // When a parameter of reference type is not bound directly to 4771 // an argument expression, the conversion sequence is the one 4772 // required to convert the argument expression to the 4773 // underlying type of the reference according to 4774 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4775 // to copy-initializing a temporary of the underlying type with 4776 // the argument expression. Any difference in top-level 4777 // cv-qualification is subsumed by the initialization itself 4778 // and does not constitute a conversion. 4779 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4780 /*AllowExplicit=*/false, 4781 /*ForceRValue=*/false, 4782 /*InOverloadResolution=*/false); 4783 4784 // Of course, that's still a reference binding. 4785 if (ICS->isStandard()) { 4786 ICS->Standard.ReferenceBinding = true; 4787 ICS->Standard.RRefBinding = isRValRef; 4788 } else if (ICS->isUserDefined()) { 4789 ICS->UserDefined.After.ReferenceBinding = true; 4790 ICS->UserDefined.After.RRefBinding = isRValRef; 4791 } 4792 return ICS->isBad(); 4793 } else { 4794 ImplicitConversionSequence Conversions; 4795 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4796 false, false, 4797 Conversions); 4798 if (badConversion) { 4799 if (Conversions.isAmbiguous()) { 4800 Diag(DeclLoc, 4801 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4802 for (int j = Conversions.Ambiguous.conversions().size()-1; 4803 j >= 0; j--) { 4804 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4805 NoteOverloadCandidate(Func); 4806 } 4807 } 4808 else { 4809 if (isRValRef) 4810 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4811 << Init->getSourceRange(); 4812 else 4813 Diag(DeclLoc, diag::err_invalid_initialization) 4814 << DeclType << Init->getType() << Init->getSourceRange(); 4815 } 4816 } 4817 return badConversion; 4818 } 4819} 4820 4821static inline bool 4822CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4823 const FunctionDecl *FnDecl) { 4824 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4825 if (isa<NamespaceDecl>(DC)) { 4826 return SemaRef.Diag(FnDecl->getLocation(), 4827 diag::err_operator_new_delete_declared_in_namespace) 4828 << FnDecl->getDeclName(); 4829 } 4830 4831 if (isa<TranslationUnitDecl>(DC) && 4832 FnDecl->getStorageClass() == FunctionDecl::Static) { 4833 return SemaRef.Diag(FnDecl->getLocation(), 4834 diag::err_operator_new_delete_declared_static) 4835 << FnDecl->getDeclName(); 4836 } 4837 4838 return false; 4839} 4840 4841static inline bool 4842CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4843 CanQualType ExpectedResultType, 4844 CanQualType ExpectedFirstParamType, 4845 unsigned DependentParamTypeDiag, 4846 unsigned InvalidParamTypeDiag) { 4847 QualType ResultType = 4848 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4849 4850 // Check that the result type is not dependent. 4851 if (ResultType->isDependentType()) 4852 return SemaRef.Diag(FnDecl->getLocation(), 4853 diag::err_operator_new_delete_dependent_result_type) 4854 << FnDecl->getDeclName() << ExpectedResultType; 4855 4856 // Check that the result type is what we expect. 4857 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4858 return SemaRef.Diag(FnDecl->getLocation(), 4859 diag::err_operator_new_delete_invalid_result_type) 4860 << FnDecl->getDeclName() << ExpectedResultType; 4861 4862 // A function template must have at least 2 parameters. 4863 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4864 return SemaRef.Diag(FnDecl->getLocation(), 4865 diag::err_operator_new_delete_template_too_few_parameters) 4866 << FnDecl->getDeclName(); 4867 4868 // The function decl must have at least 1 parameter. 4869 if (FnDecl->getNumParams() == 0) 4870 return SemaRef.Diag(FnDecl->getLocation(), 4871 diag::err_operator_new_delete_too_few_parameters) 4872 << FnDecl->getDeclName(); 4873 4874 // Check the the first parameter type is not dependent. 4875 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4876 if (FirstParamType->isDependentType()) 4877 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4878 << FnDecl->getDeclName() << ExpectedFirstParamType; 4879 4880 // Check that the first parameter type is what we expect. 4881 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4882 ExpectedFirstParamType) 4883 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4884 << FnDecl->getDeclName() << ExpectedFirstParamType; 4885 4886 return false; 4887} 4888 4889static bool 4890CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4891 // C++ [basic.stc.dynamic.allocation]p1: 4892 // A program is ill-formed if an allocation function is declared in a 4893 // namespace scope other than global scope or declared static in global 4894 // scope. 4895 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4896 return true; 4897 4898 CanQualType SizeTy = 4899 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4900 4901 // C++ [basic.stc.dynamic.allocation]p1: 4902 // The return type shall be void*. The first parameter shall have type 4903 // std::size_t. 4904 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4905 SizeTy, 4906 diag::err_operator_new_dependent_param_type, 4907 diag::err_operator_new_param_type)) 4908 return true; 4909 4910 // C++ [basic.stc.dynamic.allocation]p1: 4911 // The first parameter shall not have an associated default argument. 4912 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4913 return SemaRef.Diag(FnDecl->getLocation(), 4914 diag::err_operator_new_default_arg) 4915 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4916 4917 return false; 4918} 4919 4920static bool 4921CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4922 // C++ [basic.stc.dynamic.deallocation]p1: 4923 // A program is ill-formed if deallocation functions are declared in a 4924 // namespace scope other than global scope or declared static in global 4925 // scope. 4926 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4927 return true; 4928 4929 // C++ [basic.stc.dynamic.deallocation]p2: 4930 // Each deallocation function shall return void and its first parameter 4931 // shall be void*. 4932 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4933 SemaRef.Context.VoidPtrTy, 4934 diag::err_operator_delete_dependent_param_type, 4935 diag::err_operator_delete_param_type)) 4936 return true; 4937 4938 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4939 if (FirstParamType->isDependentType()) 4940 return SemaRef.Diag(FnDecl->getLocation(), 4941 diag::err_operator_delete_dependent_param_type) 4942 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4943 4944 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4945 SemaRef.Context.VoidPtrTy) 4946 return SemaRef.Diag(FnDecl->getLocation(), 4947 diag::err_operator_delete_param_type) 4948 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4949 4950 return false; 4951} 4952 4953/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4954/// of this overloaded operator is well-formed. If so, returns false; 4955/// otherwise, emits appropriate diagnostics and returns true. 4956bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4957 assert(FnDecl && FnDecl->isOverloadedOperator() && 4958 "Expected an overloaded operator declaration"); 4959 4960 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4961 4962 // C++ [over.oper]p5: 4963 // The allocation and deallocation functions, operator new, 4964 // operator new[], operator delete and operator delete[], are 4965 // described completely in 3.7.3. The attributes and restrictions 4966 // found in the rest of this subclause do not apply to them unless 4967 // explicitly stated in 3.7.3. 4968 if (Op == OO_Delete || Op == OO_Array_Delete) 4969 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4970 4971 if (Op == OO_New || Op == OO_Array_New) 4972 return CheckOperatorNewDeclaration(*this, FnDecl); 4973 4974 // C++ [over.oper]p6: 4975 // An operator function shall either be a non-static member 4976 // function or be a non-member function and have at least one 4977 // parameter whose type is a class, a reference to a class, an 4978 // enumeration, or a reference to an enumeration. 4979 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4980 if (MethodDecl->isStatic()) 4981 return Diag(FnDecl->getLocation(), 4982 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4983 } else { 4984 bool ClassOrEnumParam = false; 4985 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4986 ParamEnd = FnDecl->param_end(); 4987 Param != ParamEnd; ++Param) { 4988 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4989 if (ParamType->isDependentType() || ParamType->isRecordType() || 4990 ParamType->isEnumeralType()) { 4991 ClassOrEnumParam = true; 4992 break; 4993 } 4994 } 4995 4996 if (!ClassOrEnumParam) 4997 return Diag(FnDecl->getLocation(), 4998 diag::err_operator_overload_needs_class_or_enum) 4999 << FnDecl->getDeclName(); 5000 } 5001 5002 // C++ [over.oper]p8: 5003 // An operator function cannot have default arguments (8.3.6), 5004 // except where explicitly stated below. 5005 // 5006 // Only the function-call operator allows default arguments 5007 // (C++ [over.call]p1). 5008 if (Op != OO_Call) { 5009 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5010 Param != FnDecl->param_end(); ++Param) { 5011 if ((*Param)->hasDefaultArg()) 5012 return Diag((*Param)->getLocation(), 5013 diag::err_operator_overload_default_arg) 5014 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5015 } 5016 } 5017 5018 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5019 { false, false, false } 5020#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5021 , { Unary, Binary, MemberOnly } 5022#include "clang/Basic/OperatorKinds.def" 5023 }; 5024 5025 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5026 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5027 bool MustBeMemberOperator = OperatorUses[Op][2]; 5028 5029 // C++ [over.oper]p8: 5030 // [...] Operator functions cannot have more or fewer parameters 5031 // than the number required for the corresponding operator, as 5032 // described in the rest of this subclause. 5033 unsigned NumParams = FnDecl->getNumParams() 5034 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5035 if (Op != OO_Call && 5036 ((NumParams == 1 && !CanBeUnaryOperator) || 5037 (NumParams == 2 && !CanBeBinaryOperator) || 5038 (NumParams < 1) || (NumParams > 2))) { 5039 // We have the wrong number of parameters. 5040 unsigned ErrorKind; 5041 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5042 ErrorKind = 2; // 2 -> unary or binary. 5043 } else if (CanBeUnaryOperator) { 5044 ErrorKind = 0; // 0 -> unary 5045 } else { 5046 assert(CanBeBinaryOperator && 5047 "All non-call overloaded operators are unary or binary!"); 5048 ErrorKind = 1; // 1 -> binary 5049 } 5050 5051 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5052 << FnDecl->getDeclName() << NumParams << ErrorKind; 5053 } 5054 5055 // Overloaded operators other than operator() cannot be variadic. 5056 if (Op != OO_Call && 5057 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5058 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5059 << FnDecl->getDeclName(); 5060 } 5061 5062 // Some operators must be non-static member functions. 5063 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5064 return Diag(FnDecl->getLocation(), 5065 diag::err_operator_overload_must_be_member) 5066 << FnDecl->getDeclName(); 5067 } 5068 5069 // C++ [over.inc]p1: 5070 // The user-defined function called operator++ implements the 5071 // prefix and postfix ++ operator. If this function is a member 5072 // function with no parameters, or a non-member function with one 5073 // parameter of class or enumeration type, it defines the prefix 5074 // increment operator ++ for objects of that type. If the function 5075 // is a member function with one parameter (which shall be of type 5076 // int) or a non-member function with two parameters (the second 5077 // of which shall be of type int), it defines the postfix 5078 // increment operator ++ for objects of that type. 5079 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5080 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5081 bool ParamIsInt = false; 5082 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5083 ParamIsInt = BT->getKind() == BuiltinType::Int; 5084 5085 if (!ParamIsInt) 5086 return Diag(LastParam->getLocation(), 5087 diag::err_operator_overload_post_incdec_must_be_int) 5088 << LastParam->getType() << (Op == OO_MinusMinus); 5089 } 5090 5091 // Notify the class if it got an assignment operator. 5092 if (Op == OO_Equal) { 5093 // Would have returned earlier otherwise. 5094 assert(isa<CXXMethodDecl>(FnDecl) && 5095 "Overloaded = not member, but not filtered."); 5096 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5097 Method->getParent()->addedAssignmentOperator(Context, Method); 5098 } 5099 5100 return false; 5101} 5102 5103/// CheckLiteralOperatorDeclaration - Check whether the declaration 5104/// of this literal operator function is well-formed. If so, returns 5105/// false; otherwise, emits appropriate diagnostics and returns true. 5106bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5107 DeclContext *DC = FnDecl->getDeclContext(); 5108 Decl::Kind Kind = DC->getDeclKind(); 5109 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5110 Kind != Decl::LinkageSpec) { 5111 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5112 << FnDecl->getDeclName(); 5113 return true; 5114 } 5115 5116 bool Valid = false; 5117 5118 // template <char...> type operator "" name() is the only valid template 5119 // signature, and the only valid signature with no parameters. 5120 if (FnDecl->param_size() == 0) { 5121 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5122 // Must have only one template parameter 5123 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5124 if (Params->size() == 1) { 5125 NonTypeTemplateParmDecl *PmDecl = 5126 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5127 5128 // The template parameter must be a char parameter pack. 5129 // FIXME: This test will always fail because non-type parameter packs 5130 // have not been implemented. 5131 if (PmDecl && PmDecl->isTemplateParameterPack() && 5132 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5133 Valid = true; 5134 } 5135 } 5136 } else { 5137 // Check the first parameter 5138 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5139 5140 QualType T = (*Param)->getType(); 5141 5142 // unsigned long long int, long double, and any character type are allowed 5143 // as the only parameters. 5144 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5145 Context.hasSameType(T, Context.LongDoubleTy) || 5146 Context.hasSameType(T, Context.CharTy) || 5147 Context.hasSameType(T, Context.WCharTy) || 5148 Context.hasSameType(T, Context.Char16Ty) || 5149 Context.hasSameType(T, Context.Char32Ty)) { 5150 if (++Param == FnDecl->param_end()) 5151 Valid = true; 5152 goto FinishedParams; 5153 } 5154 5155 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5156 const PointerType *PT = T->getAs<PointerType>(); 5157 if (!PT) 5158 goto FinishedParams; 5159 T = PT->getPointeeType(); 5160 if (!T.isConstQualified()) 5161 goto FinishedParams; 5162 T = T.getUnqualifiedType(); 5163 5164 // Move on to the second parameter; 5165 ++Param; 5166 5167 // If there is no second parameter, the first must be a const char * 5168 if (Param == FnDecl->param_end()) { 5169 if (Context.hasSameType(T, Context.CharTy)) 5170 Valid = true; 5171 goto FinishedParams; 5172 } 5173 5174 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5175 // are allowed as the first parameter to a two-parameter function 5176 if (!(Context.hasSameType(T, Context.CharTy) || 5177 Context.hasSameType(T, Context.WCharTy) || 5178 Context.hasSameType(T, Context.Char16Ty) || 5179 Context.hasSameType(T, Context.Char32Ty))) 5180 goto FinishedParams; 5181 5182 // The second and final parameter must be an std::size_t 5183 T = (*Param)->getType().getUnqualifiedType(); 5184 if (Context.hasSameType(T, Context.getSizeType()) && 5185 ++Param == FnDecl->param_end()) 5186 Valid = true; 5187 } 5188 5189 // FIXME: This diagnostic is absolutely terrible. 5190FinishedParams: 5191 if (!Valid) { 5192 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5193 << FnDecl->getDeclName(); 5194 return true; 5195 } 5196 5197 return false; 5198} 5199 5200/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5201/// linkage specification, including the language and (if present) 5202/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5203/// the location of the language string literal, which is provided 5204/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5205/// the '{' brace. Otherwise, this linkage specification does not 5206/// have any braces. 5207Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5208 SourceLocation ExternLoc, 5209 SourceLocation LangLoc, 5210 const char *Lang, 5211 unsigned StrSize, 5212 SourceLocation LBraceLoc) { 5213 LinkageSpecDecl::LanguageIDs Language; 5214 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5215 Language = LinkageSpecDecl::lang_c; 5216 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5217 Language = LinkageSpecDecl::lang_cxx; 5218 else { 5219 Diag(LangLoc, diag::err_bad_language); 5220 return DeclPtrTy(); 5221 } 5222 5223 // FIXME: Add all the various semantics of linkage specifications 5224 5225 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5226 LangLoc, Language, 5227 LBraceLoc.isValid()); 5228 CurContext->addDecl(D); 5229 PushDeclContext(S, D); 5230 return DeclPtrTy::make(D); 5231} 5232 5233/// ActOnFinishLinkageSpecification - Completely the definition of 5234/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5235/// valid, it's the position of the closing '}' brace in a linkage 5236/// specification that uses braces. 5237Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5238 DeclPtrTy LinkageSpec, 5239 SourceLocation RBraceLoc) { 5240 if (LinkageSpec) 5241 PopDeclContext(); 5242 return LinkageSpec; 5243} 5244 5245/// \brief Perform semantic analysis for the variable declaration that 5246/// occurs within a C++ catch clause, returning the newly-created 5247/// variable. 5248VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5249 TypeSourceInfo *TInfo, 5250 IdentifierInfo *Name, 5251 SourceLocation Loc, 5252 SourceRange Range) { 5253 bool Invalid = false; 5254 5255 // Arrays and functions decay. 5256 if (ExDeclType->isArrayType()) 5257 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5258 else if (ExDeclType->isFunctionType()) 5259 ExDeclType = Context.getPointerType(ExDeclType); 5260 5261 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5262 // The exception-declaration shall not denote a pointer or reference to an 5263 // incomplete type, other than [cv] void*. 5264 // N2844 forbids rvalue references. 5265 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5266 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5267 Invalid = true; 5268 } 5269 5270 // GCC allows catching pointers and references to incomplete types 5271 // as an extension; so do we, but we warn by default. 5272 5273 QualType BaseType = ExDeclType; 5274 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5275 unsigned DK = diag::err_catch_incomplete; 5276 bool IncompleteCatchIsInvalid = true; 5277 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5278 BaseType = Ptr->getPointeeType(); 5279 Mode = 1; 5280 DK = diag::ext_catch_incomplete_ptr; 5281 IncompleteCatchIsInvalid = false; 5282 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5283 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5284 BaseType = Ref->getPointeeType(); 5285 Mode = 2; 5286 DK = diag::ext_catch_incomplete_ref; 5287 IncompleteCatchIsInvalid = false; 5288 } 5289 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5290 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5291 IncompleteCatchIsInvalid) 5292 Invalid = true; 5293 5294 if (!Invalid && !ExDeclType->isDependentType() && 5295 RequireNonAbstractType(Loc, ExDeclType, 5296 diag::err_abstract_type_in_decl, 5297 AbstractVariableType)) 5298 Invalid = true; 5299 5300 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5301 Name, ExDeclType, TInfo, VarDecl::None); 5302 5303 if (!Invalid) { 5304 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5305 // C++ [except.handle]p16: 5306 // The object declared in an exception-declaration or, if the 5307 // exception-declaration does not specify a name, a temporary (12.2) is 5308 // copy-initialized (8.5) from the exception object. [...] 5309 // The object is destroyed when the handler exits, after the destruction 5310 // of any automatic objects initialized within the handler. 5311 // 5312 // We just pretend to initialize the object with itself, then make sure 5313 // it can be destroyed later. 5314 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5315 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5316 Loc, ExDeclType, 0); 5317 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5318 SourceLocation()); 5319 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5320 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5321 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5322 if (Result.isInvalid()) 5323 Invalid = true; 5324 else 5325 FinalizeVarWithDestructor(ExDecl, RecordTy); 5326 } 5327 } 5328 5329 if (Invalid) 5330 ExDecl->setInvalidDecl(); 5331 5332 return ExDecl; 5333} 5334 5335/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5336/// handler. 5337Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5338 TypeSourceInfo *TInfo = 0; 5339 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5340 5341 bool Invalid = D.isInvalidType(); 5342 IdentifierInfo *II = D.getIdentifier(); 5343 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5344 // The scope should be freshly made just for us. There is just no way 5345 // it contains any previous declaration. 5346 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5347 if (PrevDecl->isTemplateParameter()) { 5348 // Maybe we will complain about the shadowed template parameter. 5349 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5350 } 5351 } 5352 5353 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5354 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5355 << D.getCXXScopeSpec().getRange(); 5356 Invalid = true; 5357 } 5358 5359 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5360 D.getIdentifier(), 5361 D.getIdentifierLoc(), 5362 D.getDeclSpec().getSourceRange()); 5363 5364 if (Invalid) 5365 ExDecl->setInvalidDecl(); 5366 5367 // Add the exception declaration into this scope. 5368 if (II) 5369 PushOnScopeChains(ExDecl, S); 5370 else 5371 CurContext->addDecl(ExDecl); 5372 5373 ProcessDeclAttributes(S, ExDecl, D); 5374 return DeclPtrTy::make(ExDecl); 5375} 5376 5377Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5378 ExprArg assertexpr, 5379 ExprArg assertmessageexpr) { 5380 Expr *AssertExpr = (Expr *)assertexpr.get(); 5381 StringLiteral *AssertMessage = 5382 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5383 5384 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5385 llvm::APSInt Value(32); 5386 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5387 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5388 AssertExpr->getSourceRange(); 5389 return DeclPtrTy(); 5390 } 5391 5392 if (Value == 0) { 5393 Diag(AssertLoc, diag::err_static_assert_failed) 5394 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5395 } 5396 } 5397 5398 assertexpr.release(); 5399 assertmessageexpr.release(); 5400 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5401 AssertExpr, AssertMessage); 5402 5403 CurContext->addDecl(Decl); 5404 return DeclPtrTy::make(Decl); 5405} 5406 5407/// \brief Perform semantic analysis of the given friend type declaration. 5408/// 5409/// \returns A friend declaration that. 5410FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5411 TypeSourceInfo *TSInfo) { 5412 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5413 5414 QualType T = TSInfo->getType(); 5415 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5416 5417 if (!getLangOptions().CPlusPlus0x) { 5418 // C++03 [class.friend]p2: 5419 // An elaborated-type-specifier shall be used in a friend declaration 5420 // for a class.* 5421 // 5422 // * The class-key of the elaborated-type-specifier is required. 5423 if (!ActiveTemplateInstantiations.empty()) { 5424 // Do not complain about the form of friend template types during 5425 // template instantiation; we will already have complained when the 5426 // template was declared. 5427 } else if (!T->isElaboratedTypeSpecifier()) { 5428 // If we evaluated the type to a record type, suggest putting 5429 // a tag in front. 5430 if (const RecordType *RT = T->getAs<RecordType>()) { 5431 RecordDecl *RD = RT->getDecl(); 5432 5433 std::string InsertionText = std::string(" ") + RD->getKindName(); 5434 5435 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5436 << (unsigned) RD->getTagKind() 5437 << T 5438 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5439 InsertionText); 5440 } else { 5441 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5442 << T 5443 << SourceRange(FriendLoc, TypeRange.getEnd()); 5444 } 5445 } else if (T->getAs<EnumType>()) { 5446 Diag(FriendLoc, diag::ext_enum_friend) 5447 << T 5448 << SourceRange(FriendLoc, TypeRange.getEnd()); 5449 } 5450 } 5451 5452 // C++0x [class.friend]p3: 5453 // If the type specifier in a friend declaration designates a (possibly 5454 // cv-qualified) class type, that class is declared as a friend; otherwise, 5455 // the friend declaration is ignored. 5456 5457 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5458 // in [class.friend]p3 that we do not implement. 5459 5460 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5461} 5462 5463/// Handle a friend type declaration. This works in tandem with 5464/// ActOnTag. 5465/// 5466/// Notes on friend class templates: 5467/// 5468/// We generally treat friend class declarations as if they were 5469/// declaring a class. So, for example, the elaborated type specifier 5470/// in a friend declaration is required to obey the restrictions of a 5471/// class-head (i.e. no typedefs in the scope chain), template 5472/// parameters are required to match up with simple template-ids, &c. 5473/// However, unlike when declaring a template specialization, it's 5474/// okay to refer to a template specialization without an empty 5475/// template parameter declaration, e.g. 5476/// friend class A<T>::B<unsigned>; 5477/// We permit this as a special case; if there are any template 5478/// parameters present at all, require proper matching, i.e. 5479/// template <> template <class T> friend class A<int>::B; 5480Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5481 MultiTemplateParamsArg TempParams) { 5482 SourceLocation Loc = DS.getSourceRange().getBegin(); 5483 5484 assert(DS.isFriendSpecified()); 5485 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5486 5487 // Try to convert the decl specifier to a type. This works for 5488 // friend templates because ActOnTag never produces a ClassTemplateDecl 5489 // for a TUK_Friend. 5490 Declarator TheDeclarator(DS, Declarator::MemberContext); 5491 TypeSourceInfo *TSI; 5492 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5493 if (TheDeclarator.isInvalidType()) 5494 return DeclPtrTy(); 5495 5496 if (!TSI) 5497 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5498 5499 // This is definitely an error in C++98. It's probably meant to 5500 // be forbidden in C++0x, too, but the specification is just 5501 // poorly written. 5502 // 5503 // The problem is with declarations like the following: 5504 // template <T> friend A<T>::foo; 5505 // where deciding whether a class C is a friend or not now hinges 5506 // on whether there exists an instantiation of A that causes 5507 // 'foo' to equal C. There are restrictions on class-heads 5508 // (which we declare (by fiat) elaborated friend declarations to 5509 // be) that makes this tractable. 5510 // 5511 // FIXME: handle "template <> friend class A<T>;", which 5512 // is possibly well-formed? Who even knows? 5513 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5514 Diag(Loc, diag::err_tagless_friend_type_template) 5515 << DS.getSourceRange(); 5516 return DeclPtrTy(); 5517 } 5518 5519 // C++98 [class.friend]p1: A friend of a class is a function 5520 // or class that is not a member of the class . . . 5521 // This is fixed in DR77, which just barely didn't make the C++03 5522 // deadline. It's also a very silly restriction that seriously 5523 // affects inner classes and which nobody else seems to implement; 5524 // thus we never diagnose it, not even in -pedantic. 5525 // 5526 // But note that we could warn about it: it's always useless to 5527 // friend one of your own members (it's not, however, worthless to 5528 // friend a member of an arbitrary specialization of your template). 5529 5530 Decl *D; 5531 if (unsigned NumTempParamLists = TempParams.size()) 5532 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5533 NumTempParamLists, 5534 (TemplateParameterList**) TempParams.release(), 5535 TSI, 5536 DS.getFriendSpecLoc()); 5537 else 5538 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5539 5540 if (!D) 5541 return DeclPtrTy(); 5542 5543 D->setAccess(AS_public); 5544 CurContext->addDecl(D); 5545 5546 return DeclPtrTy::make(D); 5547} 5548 5549Sema::DeclPtrTy 5550Sema::ActOnFriendFunctionDecl(Scope *S, 5551 Declarator &D, 5552 bool IsDefinition, 5553 MultiTemplateParamsArg TemplateParams) { 5554 const DeclSpec &DS = D.getDeclSpec(); 5555 5556 assert(DS.isFriendSpecified()); 5557 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5558 5559 SourceLocation Loc = D.getIdentifierLoc(); 5560 TypeSourceInfo *TInfo = 0; 5561 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5562 5563 // C++ [class.friend]p1 5564 // A friend of a class is a function or class.... 5565 // Note that this sees through typedefs, which is intended. 5566 // It *doesn't* see through dependent types, which is correct 5567 // according to [temp.arg.type]p3: 5568 // If a declaration acquires a function type through a 5569 // type dependent on a template-parameter and this causes 5570 // a declaration that does not use the syntactic form of a 5571 // function declarator to have a function type, the program 5572 // is ill-formed. 5573 if (!T->isFunctionType()) { 5574 Diag(Loc, diag::err_unexpected_friend); 5575 5576 // It might be worthwhile to try to recover by creating an 5577 // appropriate declaration. 5578 return DeclPtrTy(); 5579 } 5580 5581 // C++ [namespace.memdef]p3 5582 // - If a friend declaration in a non-local class first declares a 5583 // class or function, the friend class or function is a member 5584 // of the innermost enclosing namespace. 5585 // - The name of the friend is not found by simple name lookup 5586 // until a matching declaration is provided in that namespace 5587 // scope (either before or after the class declaration granting 5588 // friendship). 5589 // - If a friend function is called, its name may be found by the 5590 // name lookup that considers functions from namespaces and 5591 // classes associated with the types of the function arguments. 5592 // - When looking for a prior declaration of a class or a function 5593 // declared as a friend, scopes outside the innermost enclosing 5594 // namespace scope are not considered. 5595 5596 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5597 DeclarationName Name = GetNameForDeclarator(D); 5598 assert(Name); 5599 5600 // The context we found the declaration in, or in which we should 5601 // create the declaration. 5602 DeclContext *DC; 5603 5604 // FIXME: handle local classes 5605 5606 // Recover from invalid scope qualifiers as if they just weren't there. 5607 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5608 ForRedeclaration); 5609 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5610 // FIXME: RequireCompleteDeclContext 5611 DC = computeDeclContext(ScopeQual); 5612 5613 // FIXME: handle dependent contexts 5614 if (!DC) return DeclPtrTy(); 5615 5616 LookupQualifiedName(Previous, DC); 5617 5618 // If searching in that context implicitly found a declaration in 5619 // a different context, treat it like it wasn't found at all. 5620 // TODO: better diagnostics for this case. Suggesting the right 5621 // qualified scope would be nice... 5622 // FIXME: getRepresentativeDecl() is not right here at all 5623 if (Previous.empty() || 5624 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5625 D.setInvalidType(); 5626 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5627 return DeclPtrTy(); 5628 } 5629 5630 // C++ [class.friend]p1: A friend of a class is a function or 5631 // class that is not a member of the class . . . 5632 if (DC->Equals(CurContext)) 5633 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5634 5635 // Otherwise walk out to the nearest namespace scope looking for matches. 5636 } else { 5637 // TODO: handle local class contexts. 5638 5639 DC = CurContext; 5640 while (true) { 5641 // Skip class contexts. If someone can cite chapter and verse 5642 // for this behavior, that would be nice --- it's what GCC and 5643 // EDG do, and it seems like a reasonable intent, but the spec 5644 // really only says that checks for unqualified existing 5645 // declarations should stop at the nearest enclosing namespace, 5646 // not that they should only consider the nearest enclosing 5647 // namespace. 5648 while (DC->isRecord()) 5649 DC = DC->getParent(); 5650 5651 LookupQualifiedName(Previous, DC); 5652 5653 // TODO: decide what we think about using declarations. 5654 if (!Previous.empty()) 5655 break; 5656 5657 if (DC->isFileContext()) break; 5658 DC = DC->getParent(); 5659 } 5660 5661 // C++ [class.friend]p1: A friend of a class is a function or 5662 // class that is not a member of the class . . . 5663 // C++0x changes this for both friend types and functions. 5664 // Most C++ 98 compilers do seem to give an error here, so 5665 // we do, too. 5666 if (!Previous.empty() && DC->Equals(CurContext) 5667 && !getLangOptions().CPlusPlus0x) 5668 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5669 } 5670 5671 if (DC->isFileContext()) { 5672 // This implies that it has to be an operator or function. 5673 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5674 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5675 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5676 Diag(Loc, diag::err_introducing_special_friend) << 5677 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5678 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5679 return DeclPtrTy(); 5680 } 5681 } 5682 5683 bool Redeclaration = false; 5684 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5685 move(TemplateParams), 5686 IsDefinition, 5687 Redeclaration); 5688 if (!ND) return DeclPtrTy(); 5689 5690 assert(ND->getDeclContext() == DC); 5691 assert(ND->getLexicalDeclContext() == CurContext); 5692 5693 // Add the function declaration to the appropriate lookup tables, 5694 // adjusting the redeclarations list as necessary. We don't 5695 // want to do this yet if the friending class is dependent. 5696 // 5697 // Also update the scope-based lookup if the target context's 5698 // lookup context is in lexical scope. 5699 if (!CurContext->isDependentContext()) { 5700 DC = DC->getLookupContext(); 5701 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5702 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5703 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5704 } 5705 5706 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5707 D.getIdentifierLoc(), ND, 5708 DS.getFriendSpecLoc()); 5709 FrD->setAccess(AS_public); 5710 CurContext->addDecl(FrD); 5711 5712 return DeclPtrTy::make(ND); 5713} 5714 5715void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5716 AdjustDeclIfTemplate(dcl); 5717 5718 Decl *Dcl = dcl.getAs<Decl>(); 5719 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5720 if (!Fn) { 5721 Diag(DelLoc, diag::err_deleted_non_function); 5722 return; 5723 } 5724 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5725 Diag(DelLoc, diag::err_deleted_decl_not_first); 5726 Diag(Prev->getLocation(), diag::note_previous_declaration); 5727 // If the declaration wasn't the first, we delete the function anyway for 5728 // recovery. 5729 } 5730 Fn->setDeleted(); 5731} 5732 5733static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5734 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5735 ++CI) { 5736 Stmt *SubStmt = *CI; 5737 if (!SubStmt) 5738 continue; 5739 if (isa<ReturnStmt>(SubStmt)) 5740 Self.Diag(SubStmt->getSourceRange().getBegin(), 5741 diag::err_return_in_constructor_handler); 5742 if (!isa<Expr>(SubStmt)) 5743 SearchForReturnInStmt(Self, SubStmt); 5744 } 5745} 5746 5747void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5748 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5749 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5750 SearchForReturnInStmt(*this, Handler); 5751 } 5752} 5753 5754bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5755 const CXXMethodDecl *Old) { 5756 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5757 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5758 5759 if (Context.hasSameType(NewTy, OldTy) || 5760 NewTy->isDependentType() || OldTy->isDependentType()) 5761 return false; 5762 5763 // Check if the return types are covariant 5764 QualType NewClassTy, OldClassTy; 5765 5766 /// Both types must be pointers or references to classes. 5767 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5768 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5769 NewClassTy = NewPT->getPointeeType(); 5770 OldClassTy = OldPT->getPointeeType(); 5771 } 5772 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5773 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5774 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5775 NewClassTy = NewRT->getPointeeType(); 5776 OldClassTy = OldRT->getPointeeType(); 5777 } 5778 } 5779 } 5780 5781 // The return types aren't either both pointers or references to a class type. 5782 if (NewClassTy.isNull()) { 5783 Diag(New->getLocation(), 5784 diag::err_different_return_type_for_overriding_virtual_function) 5785 << New->getDeclName() << NewTy << OldTy; 5786 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5787 5788 return true; 5789 } 5790 5791 // C++ [class.virtual]p6: 5792 // If the return type of D::f differs from the return type of B::f, the 5793 // class type in the return type of D::f shall be complete at the point of 5794 // declaration of D::f or shall be the class type D. 5795 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5796 if (!RT->isBeingDefined() && 5797 RequireCompleteType(New->getLocation(), NewClassTy, 5798 PDiag(diag::err_covariant_return_incomplete) 5799 << New->getDeclName())) 5800 return true; 5801 } 5802 5803 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5804 // Check if the new class derives from the old class. 5805 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5806 Diag(New->getLocation(), 5807 diag::err_covariant_return_not_derived) 5808 << New->getDeclName() << NewTy << OldTy; 5809 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5810 return true; 5811 } 5812 5813 // Check if we the conversion from derived to base is valid. 5814 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5815 diag::err_covariant_return_inaccessible_base, 5816 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5817 // FIXME: Should this point to the return type? 5818 New->getLocation(), SourceRange(), New->getDeclName())) { 5819 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5820 return true; 5821 } 5822 } 5823 5824 // The qualifiers of the return types must be the same. 5825 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5826 Diag(New->getLocation(), 5827 diag::err_covariant_return_type_different_qualifications) 5828 << New->getDeclName() << NewTy << OldTy; 5829 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5830 return true; 5831 }; 5832 5833 5834 // The new class type must have the same or less qualifiers as the old type. 5835 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5836 Diag(New->getLocation(), 5837 diag::err_covariant_return_type_class_type_more_qualified) 5838 << New->getDeclName() << NewTy << OldTy; 5839 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5840 return true; 5841 }; 5842 5843 return false; 5844} 5845 5846bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5847 const CXXMethodDecl *Old) 5848{ 5849 if (Old->hasAttr<FinalAttr>()) { 5850 Diag(New->getLocation(), diag::err_final_function_overridden) 5851 << New->getDeclName(); 5852 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5853 return true; 5854 } 5855 5856 return false; 5857} 5858 5859/// \brief Mark the given method pure. 5860/// 5861/// \param Method the method to be marked pure. 5862/// 5863/// \param InitRange the source range that covers the "0" initializer. 5864bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5865 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5866 Method->setPure(); 5867 5868 // A class is abstract if at least one function is pure virtual. 5869 Method->getParent()->setAbstract(true); 5870 return false; 5871 } 5872 5873 if (!Method->isInvalidDecl()) 5874 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5875 << Method->getDeclName() << InitRange; 5876 return true; 5877} 5878 5879/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5880/// an initializer for the out-of-line declaration 'Dcl'. The scope 5881/// is a fresh scope pushed for just this purpose. 5882/// 5883/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5884/// static data member of class X, names should be looked up in the scope of 5885/// class X. 5886void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5887 // If there is no declaration, there was an error parsing it. 5888 Decl *D = Dcl.getAs<Decl>(); 5889 if (D == 0) return; 5890 5891 // We should only get called for declarations with scope specifiers, like: 5892 // int foo::bar; 5893 assert(D->isOutOfLine()); 5894 EnterDeclaratorContext(S, D->getDeclContext()); 5895} 5896 5897/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5898/// initializer for the out-of-line declaration 'Dcl'. 5899void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5900 // If there is no declaration, there was an error parsing it. 5901 Decl *D = Dcl.getAs<Decl>(); 5902 if (D == 0) return; 5903 5904 assert(D->isOutOfLine()); 5905 ExitDeclaratorContext(S); 5906} 5907 5908/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5909/// C++ if/switch/while/for statement. 5910/// e.g: "if (int x = f()) {...}" 5911Action::DeclResult 5912Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5913 // C++ 6.4p2: 5914 // The declarator shall not specify a function or an array. 5915 // The type-specifier-seq shall not contain typedef and shall not declare a 5916 // new class or enumeration. 5917 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5918 "Parser allowed 'typedef' as storage class of condition decl."); 5919 5920 TypeSourceInfo *TInfo = 0; 5921 TagDecl *OwnedTag = 0; 5922 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5923 5924 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5925 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5926 // would be created and CXXConditionDeclExpr wants a VarDecl. 5927 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5928 << D.getSourceRange(); 5929 return DeclResult(); 5930 } else if (OwnedTag && OwnedTag->isDefinition()) { 5931 // The type-specifier-seq shall not declare a new class or enumeration. 5932 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5933 } 5934 5935 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5936 if (!Dcl) 5937 return DeclResult(); 5938 5939 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5940 VD->setDeclaredInCondition(true); 5941 return Dcl; 5942} 5943 5944static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5945 // Ignore dependent types. 5946 if (MD->isDependentContext()) 5947 return false; 5948 5949 // Ignore declarations that are not definitions. 5950 if (!MD->isThisDeclarationADefinition()) 5951 return false; 5952 5953 CXXRecordDecl *RD = MD->getParent(); 5954 5955 // Ignore classes without a vtable. 5956 if (!RD->isDynamicClass()) 5957 return false; 5958 5959 switch (MD->getParent()->getTemplateSpecializationKind()) { 5960 case TSK_Undeclared: 5961 case TSK_ExplicitSpecialization: 5962 // Classes that aren't instantiations of templates don't need their 5963 // virtual methods marked until we see the definition of the key 5964 // function. 5965 break; 5966 5967 case TSK_ImplicitInstantiation: 5968 // This is a constructor of a class template; mark all of the virtual 5969 // members as referenced to ensure that they get instantiatied. 5970 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5971 return true; 5972 break; 5973 5974 case TSK_ExplicitInstantiationDeclaration: 5975 return false; 5976 5977 case TSK_ExplicitInstantiationDefinition: 5978 // This is method of a explicit instantiation; mark all of the virtual 5979 // members as referenced to ensure that they get instantiatied. 5980 return true; 5981 } 5982 5983 // Consider only out-of-line definitions of member functions. When we see 5984 // an inline definition, it's too early to compute the key function. 5985 if (!MD->isOutOfLine()) 5986 return false; 5987 5988 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5989 5990 // If there is no key function, we will need a copy of the vtable. 5991 if (!KeyFunction) 5992 return true; 5993 5994 // If this is the key function, we need to mark virtual members. 5995 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5996 return true; 5997 5998 return false; 5999} 6000 6001void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 6002 CXXMethodDecl *MD) { 6003 CXXRecordDecl *RD = MD->getParent(); 6004 6005 // We will need to mark all of the virtual members as referenced to build the 6006 // vtable. 6007 if (!needsVtable(MD, Context)) 6008 return; 6009 6010 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 6011 if (kind == TSK_ImplicitInstantiation) 6012 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 6013 else 6014 MarkVirtualMembersReferenced(Loc, RD); 6015} 6016 6017bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 6018 if (ClassesWithUnmarkedVirtualMembers.empty()) 6019 return false; 6020 6021 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 6022 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 6023 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 6024 ClassesWithUnmarkedVirtualMembers.pop_back(); 6025 MarkVirtualMembersReferenced(Loc, RD); 6026 } 6027 6028 return true; 6029} 6030 6031void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6032 const CXXRecordDecl *RD) { 6033 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6034 e = RD->method_end(); i != e; ++i) { 6035 CXXMethodDecl *MD = *i; 6036 6037 // C++ [basic.def.odr]p2: 6038 // [...] A virtual member function is used if it is not pure. [...] 6039 if (MD->isVirtual() && !MD->isPure()) 6040 MarkDeclarationReferenced(Loc, MD); 6041 } 6042 6043 // Only classes that have virtual bases need a VTT. 6044 if (RD->getNumVBases() == 0) 6045 return; 6046 6047 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6048 e = RD->bases_end(); i != e; ++i) { 6049 const CXXRecordDecl *Base = 6050 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6051 if (i->isVirtual()) 6052 continue; 6053 if (Base->getNumVBases() == 0) 6054 continue; 6055 MarkVirtualMembersReferenced(Loc, Base); 6056 } 6057} 6058