SemaDeclCXX.cpp revision 32daa4223ccb2c0afe5fbe151c6eb1ab64816957
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 const CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1080 bool NotUnknownSpecialization = false; 1081 DeclContext *DC = computeDeclContext(SS, false); 1082 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1083 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1084 1085 if (!NotUnknownSpecialization) { 1086 // When the scope specifier can refer to a member of an unknown 1087 // specialization, we take it as a type name. 1088 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1089 *MemberOrBase, SS.getRange()); 1090 if (BaseType.isNull()) 1091 return true; 1092 1093 R.clear(); 1094 } 1095 } 1096 1097 // If no results were found, try to correct typos. 1098 if (R.empty() && BaseType.isNull() && 1099 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1100 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1101 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1102 // We have found a non-static data member with a similar 1103 // name to what was typed; complain and initialize that 1104 // member. 1105 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1106 << MemberOrBase << true << R.getLookupName() 1107 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1108 R.getLookupName().getAsString()); 1109 Diag(Member->getLocation(), diag::note_previous_decl) 1110 << Member->getDeclName(); 1111 1112 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1113 LParenLoc, RParenLoc); 1114 } 1115 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1116 const CXXBaseSpecifier *DirectBaseSpec; 1117 const CXXBaseSpecifier *VirtualBaseSpec; 1118 if (FindBaseInitializer(*this, ClassDecl, 1119 Context.getTypeDeclType(Type), 1120 DirectBaseSpec, VirtualBaseSpec)) { 1121 // We have found a direct or virtual base class with a 1122 // similar name to what was typed; complain and initialize 1123 // that base class. 1124 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1125 << MemberOrBase << false << R.getLookupName() 1126 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1127 R.getLookupName().getAsString()); 1128 1129 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1130 : VirtualBaseSpec; 1131 Diag(BaseSpec->getSourceRange().getBegin(), 1132 diag::note_base_class_specified_here) 1133 << BaseSpec->getType() 1134 << BaseSpec->getSourceRange(); 1135 1136 TyD = Type; 1137 } 1138 } 1139 } 1140 1141 if (!TyD && BaseType.isNull()) { 1142 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1143 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1144 return true; 1145 } 1146 } 1147 1148 if (BaseType.isNull()) { 1149 BaseType = Context.getTypeDeclType(TyD); 1150 if (SS.isSet()) { 1151 NestedNameSpecifier *Qualifier = 1152 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1153 1154 // FIXME: preserve source range information 1155 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1156 } 1157 } 1158 } 1159 1160 if (!TInfo) 1161 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1162 1163 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1164 LParenLoc, RParenLoc, ClassDecl); 1165} 1166 1167/// Checks an initializer expression for use of uninitialized fields, such as 1168/// containing the field that is being initialized. Returns true if there is an 1169/// uninitialized field was used an updates the SourceLocation parameter; false 1170/// otherwise. 1171static bool InitExprContainsUninitializedFields(const Stmt* S, 1172 const FieldDecl* LhsField, 1173 SourceLocation* L) { 1174 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1175 if (ME) { 1176 const NamedDecl* RhsField = ME->getMemberDecl(); 1177 if (RhsField == LhsField) { 1178 // Initializing a field with itself. Throw a warning. 1179 // But wait; there are exceptions! 1180 // Exception #1: The field may not belong to this record. 1181 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1182 const Expr* base = ME->getBase(); 1183 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1184 // Even though the field matches, it does not belong to this record. 1185 return false; 1186 } 1187 // None of the exceptions triggered; return true to indicate an 1188 // uninitialized field was used. 1189 *L = ME->getMemberLoc(); 1190 return true; 1191 } 1192 } 1193 bool found = false; 1194 for (Stmt::const_child_iterator it = S->child_begin(); 1195 it != S->child_end() && found == false; 1196 ++it) { 1197 if (isa<CallExpr>(S)) { 1198 // Do not descend into function calls or constructors, as the use 1199 // of an uninitialized field may be valid. One would have to inspect 1200 // the contents of the function/ctor to determine if it is safe or not. 1201 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1202 // may be safe, depending on what the function/ctor does. 1203 continue; 1204 } 1205 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1206 } 1207 return found; 1208} 1209 1210Sema::MemInitResult 1211Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1212 unsigned NumArgs, SourceLocation IdLoc, 1213 SourceLocation LParenLoc, 1214 SourceLocation RParenLoc) { 1215 // Diagnose value-uses of fields to initialize themselves, e.g. 1216 // foo(foo) 1217 // where foo is not also a parameter to the constructor. 1218 // TODO: implement -Wuninitialized and fold this into that framework. 1219 for (unsigned i = 0; i < NumArgs; ++i) { 1220 SourceLocation L; 1221 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1222 // FIXME: Return true in the case when other fields are used before being 1223 // uninitialized. For example, let this field be the i'th field. When 1224 // initializing the i'th field, throw a warning if any of the >= i'th 1225 // fields are used, as they are not yet initialized. 1226 // Right now we are only handling the case where the i'th field uses 1227 // itself in its initializer. 1228 Diag(L, diag::warn_field_is_uninit); 1229 } 1230 } 1231 1232 bool HasDependentArg = false; 1233 for (unsigned i = 0; i < NumArgs; i++) 1234 HasDependentArg |= Args[i]->isTypeDependent(); 1235 1236 QualType FieldType = Member->getType(); 1237 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1238 FieldType = Array->getElementType(); 1239 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1240 if (FieldType->isDependentType() || HasDependentArg) { 1241 // Can't check initialization for a member of dependent type or when 1242 // any of the arguments are type-dependent expressions. 1243 OwningExprResult Init 1244 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1245 RParenLoc)); 1246 1247 // Erase any temporaries within this evaluation context; we're not 1248 // going to track them in the AST, since we'll be rebuilding the 1249 // ASTs during template instantiation. 1250 ExprTemporaries.erase( 1251 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1252 ExprTemporaries.end()); 1253 1254 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1255 LParenLoc, 1256 Init.takeAs<Expr>(), 1257 RParenLoc); 1258 1259 } 1260 1261 if (Member->isInvalidDecl()) 1262 return true; 1263 1264 // Initialize the member. 1265 InitializedEntity MemberEntity = 1266 InitializedEntity::InitializeMember(Member, 0); 1267 InitializationKind Kind = 1268 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1269 1270 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1271 1272 OwningExprResult MemberInit = 1273 InitSeq.Perform(*this, MemberEntity, Kind, 1274 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1275 if (MemberInit.isInvalid()) 1276 return true; 1277 1278 // C++0x [class.base.init]p7: 1279 // The initialization of each base and member constitutes a 1280 // full-expression. 1281 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1282 if (MemberInit.isInvalid()) 1283 return true; 1284 1285 // If we are in a dependent context, template instantiation will 1286 // perform this type-checking again. Just save the arguments that we 1287 // received in a ParenListExpr. 1288 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1289 // of the information that we have about the member 1290 // initializer. However, deconstructing the ASTs is a dicey process, 1291 // and this approach is far more likely to get the corner cases right. 1292 if (CurContext->isDependentContext()) { 1293 // Bump the reference count of all of the arguments. 1294 for (unsigned I = 0; I != NumArgs; ++I) 1295 Args[I]->Retain(); 1296 1297 OwningExprResult Init 1298 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1299 RParenLoc)); 1300 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1301 LParenLoc, 1302 Init.takeAs<Expr>(), 1303 RParenLoc); 1304 } 1305 1306 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1307 LParenLoc, 1308 MemberInit.takeAs<Expr>(), 1309 RParenLoc); 1310} 1311 1312Sema::MemInitResult 1313Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1314 Expr **Args, unsigned NumArgs, 1315 SourceLocation LParenLoc, SourceLocation RParenLoc, 1316 CXXRecordDecl *ClassDecl) { 1317 bool HasDependentArg = false; 1318 for (unsigned i = 0; i < NumArgs; i++) 1319 HasDependentArg |= Args[i]->isTypeDependent(); 1320 1321 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1322 if (BaseType->isDependentType() || HasDependentArg) { 1323 // Can't check initialization for a base of dependent type or when 1324 // any of the arguments are type-dependent expressions. 1325 OwningExprResult BaseInit 1326 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1327 RParenLoc)); 1328 1329 // Erase any temporaries within this evaluation context; we're not 1330 // going to track them in the AST, since we'll be rebuilding the 1331 // ASTs during template instantiation. 1332 ExprTemporaries.erase( 1333 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1334 ExprTemporaries.end()); 1335 1336 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1337 LParenLoc, 1338 BaseInit.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 if (!BaseType->isRecordType()) 1343 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1344 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1345 1346 // C++ [class.base.init]p2: 1347 // [...] Unless the mem-initializer-id names a nonstatic data 1348 // member of the constructor’s class or a direct or virtual base 1349 // of that class, the mem-initializer is ill-formed. A 1350 // mem-initializer-list can initialize a base class using any 1351 // name that denotes that base class type. 1352 1353 // Check for direct and virtual base classes. 1354 const CXXBaseSpecifier *DirectBaseSpec = 0; 1355 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1356 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1357 VirtualBaseSpec); 1358 1359 // C++ [base.class.init]p2: 1360 // If a mem-initializer-id is ambiguous because it designates both 1361 // a direct non-virtual base class and an inherited virtual base 1362 // class, the mem-initializer is ill-formed. 1363 if (DirectBaseSpec && VirtualBaseSpec) 1364 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1365 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1366 // C++ [base.class.init]p2: 1367 // Unless the mem-initializer-id names a nonstatic data membeer of the 1368 // constructor's class ot a direst or virtual base of that class, the 1369 // mem-initializer is ill-formed. 1370 if (!DirectBaseSpec && !VirtualBaseSpec) 1371 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1372 << BaseType << ClassDecl->getNameAsCString() 1373 << BaseTInfo->getTypeLoc().getSourceRange(); 1374 1375 CXXBaseSpecifier *BaseSpec 1376 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1377 if (!BaseSpec) 1378 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1379 1380 // Initialize the base. 1381 InitializedEntity BaseEntity = 1382 InitializedEntity::InitializeBase(Context, BaseSpec); 1383 InitializationKind Kind = 1384 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1385 1386 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1387 1388 OwningExprResult BaseInit = 1389 InitSeq.Perform(*this, BaseEntity, Kind, 1390 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1391 if (BaseInit.isInvalid()) 1392 return true; 1393 1394 // C++0x [class.base.init]p7: 1395 // The initialization of each base and member constitutes a 1396 // full-expression. 1397 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1398 if (BaseInit.isInvalid()) 1399 return true; 1400 1401 // If we are in a dependent context, template instantiation will 1402 // perform this type-checking again. Just save the arguments that we 1403 // received in a ParenListExpr. 1404 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1405 // of the information that we have about the base 1406 // initializer. However, deconstructing the ASTs is a dicey process, 1407 // and this approach is far more likely to get the corner cases right. 1408 if (CurContext->isDependentContext()) { 1409 // Bump the reference count of all of the arguments. 1410 for (unsigned I = 0; I != NumArgs; ++I) 1411 Args[I]->Retain(); 1412 1413 OwningExprResult Init 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1417 LParenLoc, 1418 Init.takeAs<Expr>(), 1419 RParenLoc); 1420 } 1421 1422 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1423 LParenLoc, 1424 BaseInit.takeAs<Expr>(), 1425 RParenLoc); 1426} 1427 1428bool 1429Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1430 CXXBaseOrMemberInitializer **Initializers, 1431 unsigned NumInitializers, 1432 bool IsImplicitConstructor, 1433 bool AnyErrors) { 1434 // We need to build the initializer AST according to order of construction 1435 // and not what user specified in the Initializers list. 1436 CXXRecordDecl *ClassDecl 1437 = cast<CXXRecordDecl>(Constructor->getDeclContext())->getDefinition(); 1438 if (!ClassDecl) 1439 return true; 1440 1441 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1442 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1443 bool HasDependentBaseInit = false; 1444 bool HadError = false; 1445 1446 for (unsigned i = 0; i < NumInitializers; i++) { 1447 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1448 if (Member->isBaseInitializer()) { 1449 if (Member->getBaseClass()->isDependentType()) 1450 HasDependentBaseInit = true; 1451 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1452 } else { 1453 AllBaseFields[Member->getMember()] = Member; 1454 } 1455 } 1456 1457 if (HasDependentBaseInit) { 1458 // FIXME. This does not preserve the ordering of the initializers. 1459 // Try (with -Wreorder) 1460 // template<class X> struct A {}; 1461 // template<class X> struct B : A<X> { 1462 // B() : x1(10), A<X>() {} 1463 // int x1; 1464 // }; 1465 // B<int> x; 1466 // On seeing one dependent type, we should essentially exit this routine 1467 // while preserving user-declared initializer list. When this routine is 1468 // called during instantiatiation process, this routine will rebuild the 1469 // ordered initializer list correctly. 1470 1471 // If we have a dependent base initialization, we can't determine the 1472 // association between initializers and bases; just dump the known 1473 // initializers into the list, and don't try to deal with other bases. 1474 for (unsigned i = 0; i < NumInitializers; i++) { 1475 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1476 if (Member->isBaseInitializer()) 1477 AllToInit.push_back(Member); 1478 } 1479 } else { 1480 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1481 1482 // Push virtual bases before others. 1483 for (CXXRecordDecl::base_class_iterator VBase = 1484 ClassDecl->vbases_begin(), 1485 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1486 if (VBase->getType()->isDependentType()) 1487 continue; 1488 if (CXXBaseOrMemberInitializer *Value 1489 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1490 AllToInit.push_back(Value); 1491 } else if (!AnyErrors) { 1492 InitializedEntity InitEntity 1493 = InitializedEntity::InitializeBase(Context, VBase); 1494 InitializationKind InitKind 1495 = InitializationKind::CreateDefault(Constructor->getLocation()); 1496 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1497 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1498 MultiExprArg(*this, 0, 0)); 1499 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1500 if (BaseInit.isInvalid()) { 1501 HadError = true; 1502 continue; 1503 } 1504 1505 // Don't attach synthesized base initializers in a dependent 1506 // context; they'll be checked again at template instantiation 1507 // time. 1508 if (CurContext->isDependentContext()) 1509 continue; 1510 1511 CXXBaseOrMemberInitializer *CXXBaseInit = 1512 new (Context) CXXBaseOrMemberInitializer(Context, 1513 Context.getTrivialTypeSourceInfo(VBase->getType(), 1514 SourceLocation()), 1515 SourceLocation(), 1516 BaseInit.takeAs<Expr>(), 1517 SourceLocation()); 1518 AllToInit.push_back(CXXBaseInit); 1519 } 1520 } 1521 1522 for (CXXRecordDecl::base_class_iterator Base = 1523 ClassDecl->bases_begin(), 1524 E = ClassDecl->bases_end(); Base != E; ++Base) { 1525 // Virtuals are in the virtual base list and already constructed. 1526 if (Base->isVirtual()) 1527 continue; 1528 // Skip dependent types. 1529 if (Base->getType()->isDependentType()) 1530 continue; 1531 if (CXXBaseOrMemberInitializer *Value 1532 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1533 AllToInit.push_back(Value); 1534 } 1535 else if (!AnyErrors) { 1536 InitializedEntity InitEntity 1537 = InitializedEntity::InitializeBase(Context, Base); 1538 InitializationKind InitKind 1539 = InitializationKind::CreateDefault(Constructor->getLocation()); 1540 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1541 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1542 MultiExprArg(*this, 0, 0)); 1543 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1544 if (BaseInit.isInvalid()) { 1545 HadError = true; 1546 continue; 1547 } 1548 1549 // Don't attach synthesized base initializers in a dependent 1550 // context; they'll be regenerated at template instantiation 1551 // time. 1552 if (CurContext->isDependentContext()) 1553 continue; 1554 1555 CXXBaseOrMemberInitializer *CXXBaseInit = 1556 new (Context) CXXBaseOrMemberInitializer(Context, 1557 Context.getTrivialTypeSourceInfo(Base->getType(), 1558 SourceLocation()), 1559 SourceLocation(), 1560 BaseInit.takeAs<Expr>(), 1561 SourceLocation()); 1562 AllToInit.push_back(CXXBaseInit); 1563 } 1564 } 1565 } 1566 1567 // non-static data members. 1568 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1569 E = ClassDecl->field_end(); Field != E; ++Field) { 1570 if ((*Field)->isAnonymousStructOrUnion()) { 1571 if (const RecordType *FieldClassType = 1572 Field->getType()->getAs<RecordType>()) { 1573 CXXRecordDecl *FieldClassDecl 1574 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1575 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1576 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1577 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1578 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1579 // set to the anonymous union data member used in the initializer 1580 // list. 1581 Value->setMember(*Field); 1582 Value->setAnonUnionMember(*FA); 1583 AllToInit.push_back(Value); 1584 break; 1585 } 1586 } 1587 } 1588 continue; 1589 } 1590 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1591 AllToInit.push_back(Value); 1592 continue; 1593 } 1594 1595 if ((*Field)->getType()->isDependentType() || AnyErrors) 1596 continue; 1597 1598 QualType FT = Context.getBaseElementType((*Field)->getType()); 1599 if (FT->getAs<RecordType>()) { 1600 InitializedEntity InitEntity 1601 = InitializedEntity::InitializeMember(*Field); 1602 InitializationKind InitKind 1603 = InitializationKind::CreateDefault(Constructor->getLocation()); 1604 1605 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1606 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1607 MultiExprArg(*this, 0, 0)); 1608 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1609 if (MemberInit.isInvalid()) { 1610 HadError = true; 1611 continue; 1612 } 1613 1614 // Don't attach synthesized member initializers in a dependent 1615 // context; they'll be regenerated a template instantiation 1616 // time. 1617 if (CurContext->isDependentContext()) 1618 continue; 1619 1620 CXXBaseOrMemberInitializer *Member = 1621 new (Context) CXXBaseOrMemberInitializer(Context, 1622 *Field, SourceLocation(), 1623 SourceLocation(), 1624 MemberInit.takeAs<Expr>(), 1625 SourceLocation()); 1626 1627 AllToInit.push_back(Member); 1628 } 1629 else if (FT->isReferenceType()) { 1630 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1631 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1632 << 0 << (*Field)->getDeclName(); 1633 Diag((*Field)->getLocation(), diag::note_declared_at); 1634 HadError = true; 1635 } 1636 else if (FT.isConstQualified()) { 1637 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1638 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1639 << 1 << (*Field)->getDeclName(); 1640 Diag((*Field)->getLocation(), diag::note_declared_at); 1641 HadError = true; 1642 } 1643 } 1644 1645 NumInitializers = AllToInit.size(); 1646 if (NumInitializers > 0) { 1647 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1648 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1649 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1650 memcpy(baseOrMemberInitializers, AllToInit.data(), 1651 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1652 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1653 1654 // Constructors implicitly reference the base and member 1655 // destructors. 1656 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1657 Constructor->getParent()); 1658 } 1659 1660 return HadError; 1661} 1662 1663static void *GetKeyForTopLevelField(FieldDecl *Field) { 1664 // For anonymous unions, use the class declaration as the key. 1665 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1666 if (RT->getDecl()->isAnonymousStructOrUnion()) 1667 return static_cast<void *>(RT->getDecl()); 1668 } 1669 return static_cast<void *>(Field); 1670} 1671 1672static void *GetKeyForBase(QualType BaseType) { 1673 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1674 return (void *)RT; 1675 1676 assert(0 && "Unexpected base type!"); 1677 return 0; 1678} 1679 1680static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1681 bool MemberMaybeAnon = false) { 1682 if (!Member->isMemberInitializer()) 1683 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1684 1685 // For fields injected into the class via declaration of an anonymous union, 1686 // use its anonymous union class declaration as the unique key. 1687 FieldDecl *Field = Member->getMember(); 1688 1689 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1690 // data member of the class. Data member used in the initializer list is 1691 // in AnonUnionMember field. 1692 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1693 Field = Member->getAnonUnionMember(); 1694 1695 // If the field is a member of an anonymous union, we use record decl of the 1696 // union as the key. 1697 RecordDecl *RD = Field->getParent(); 1698 if (RD->isAnonymousStructOrUnion() && RD->isUnion()) 1699 return static_cast<void *>(RD); 1700 1701 return static_cast<void *>(Field); 1702} 1703 1704/// ActOnMemInitializers - Handle the member initializers for a constructor. 1705void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1706 SourceLocation ColonLoc, 1707 MemInitTy **MemInits, unsigned NumMemInits, 1708 bool AnyErrors) { 1709 if (!ConstructorDecl) 1710 return; 1711 1712 AdjustDeclIfTemplate(ConstructorDecl); 1713 1714 CXXConstructorDecl *Constructor 1715 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1716 1717 if (!Constructor) { 1718 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1719 return; 1720 } 1721 1722 if (!Constructor->isDependentContext()) { 1723 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1724 bool err = false; 1725 for (unsigned i = 0; i < NumMemInits; i++) { 1726 CXXBaseOrMemberInitializer *Member = 1727 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1728 void *KeyToMember = GetKeyForMember(Member); 1729 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1730 if (!PrevMember) { 1731 PrevMember = Member; 1732 continue; 1733 } 1734 if (FieldDecl *Field = Member->getMember()) 1735 Diag(Member->getSourceLocation(), 1736 diag::error_multiple_mem_initialization) 1737 << Field->getNameAsString() 1738 << Member->getSourceRange(); 1739 else { 1740 Type *BaseClass = Member->getBaseClass(); 1741 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1742 Diag(Member->getSourceLocation(), 1743 diag::error_multiple_base_initialization) 1744 << QualType(BaseClass, 0) 1745 << Member->getSourceRange(); 1746 } 1747 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1748 << 0; 1749 err = true; 1750 } 1751 1752 if (err) 1753 return; 1754 } 1755 1756 SetBaseOrMemberInitializers(Constructor, 1757 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1758 NumMemInits, /*IsImplicitConstructor=*/false, AnyErrors); 1759 1760 if (Constructor->isDependentContext()) 1761 return; 1762 1763 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1764 Diagnostic::Ignored && 1765 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1766 Diagnostic::Ignored) 1767 return; 1768 1769 // Also issue warning if order of ctor-initializer list does not match order 1770 // of 1) base class declarations and 2) order of non-static data members. 1771 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1772 1773 CXXRecordDecl *ClassDecl 1774 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1775 // Push virtual bases before others. 1776 for (CXXRecordDecl::base_class_iterator VBase = 1777 ClassDecl->vbases_begin(), 1778 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1779 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1780 1781 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1782 E = ClassDecl->bases_end(); Base != E; ++Base) { 1783 // Virtuals are alread in the virtual base list and are constructed 1784 // first. 1785 if (Base->isVirtual()) 1786 continue; 1787 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1788 } 1789 1790 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1791 E = ClassDecl->field_end(); Field != E; ++Field) 1792 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1793 1794 int Last = AllBaseOrMembers.size(); 1795 int curIndex = 0; 1796 CXXBaseOrMemberInitializer *PrevMember = 0; 1797 for (unsigned i = 0; i < NumMemInits; i++) { 1798 CXXBaseOrMemberInitializer *Member = 1799 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1800 void *MemberInCtorList = GetKeyForMember(Member, true); 1801 1802 for (; curIndex < Last; curIndex++) 1803 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1804 break; 1805 if (curIndex == Last) { 1806 assert(PrevMember && "Member not in member list?!"); 1807 // Initializer as specified in ctor-initializer list is out of order. 1808 // Issue a warning diagnostic. 1809 if (PrevMember->isBaseInitializer()) { 1810 // Diagnostics is for an initialized base class. 1811 Type *BaseClass = PrevMember->getBaseClass(); 1812 Diag(PrevMember->getSourceLocation(), 1813 diag::warn_base_initialized) 1814 << QualType(BaseClass, 0); 1815 } else { 1816 FieldDecl *Field = PrevMember->getMember(); 1817 Diag(PrevMember->getSourceLocation(), 1818 diag::warn_field_initialized) 1819 << Field->getNameAsString(); 1820 } 1821 // Also the note! 1822 if (FieldDecl *Field = Member->getMember()) 1823 Diag(Member->getSourceLocation(), 1824 diag::note_fieldorbase_initialized_here) << 0 1825 << Field->getNameAsString(); 1826 else { 1827 Type *BaseClass = Member->getBaseClass(); 1828 Diag(Member->getSourceLocation(), 1829 diag::note_fieldorbase_initialized_here) << 1 1830 << QualType(BaseClass, 0); 1831 } 1832 for (curIndex = 0; curIndex < Last; curIndex++) 1833 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1834 break; 1835 } 1836 PrevMember = Member; 1837 } 1838} 1839 1840void 1841Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1842 CXXRecordDecl *ClassDecl) { 1843 // Ignore dependent contexts. 1844 if (ClassDecl->isDependentContext()) 1845 return; 1846 1847 // FIXME: all the access-control diagnostics are positioned on the 1848 // field/base declaration. That's probably good; that said, the 1849 // user might reasonably want to know why the destructor is being 1850 // emitted, and we currently don't say. 1851 1852 // Non-static data members. 1853 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1854 E = ClassDecl->field_end(); I != E; ++I) { 1855 FieldDecl *Field = *I; 1856 1857 QualType FieldType = Context.getBaseElementType(Field->getType()); 1858 1859 const RecordType* RT = FieldType->getAs<RecordType>(); 1860 if (!RT) 1861 continue; 1862 1863 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1864 if (FieldClassDecl->hasTrivialDestructor()) 1865 continue; 1866 1867 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1868 CheckDestructorAccess(Field->getLocation(), Dtor, 1869 PDiag(diag::err_access_dtor_field) 1870 << Field->getDeclName() 1871 << FieldType); 1872 1873 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1874 } 1875 1876 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1877 1878 // Bases. 1879 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1880 E = ClassDecl->bases_end(); Base != E; ++Base) { 1881 // Bases are always records in a well-formed non-dependent class. 1882 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1883 1884 // Remember direct virtual bases. 1885 if (Base->isVirtual()) 1886 DirectVirtualBases.insert(RT); 1887 1888 // Ignore trivial destructors. 1889 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1890 if (BaseClassDecl->hasTrivialDestructor()) 1891 continue; 1892 1893 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1894 1895 // FIXME: caret should be on the start of the class name 1896 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1897 PDiag(diag::err_access_dtor_base) 1898 << Base->getType() 1899 << Base->getSourceRange()); 1900 1901 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1902 } 1903 1904 // Virtual bases. 1905 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1906 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1907 1908 // Bases are always records in a well-formed non-dependent class. 1909 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1910 1911 // Ignore direct virtual bases. 1912 if (DirectVirtualBases.count(RT)) 1913 continue; 1914 1915 // Ignore trivial destructors. 1916 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1917 if (BaseClassDecl->hasTrivialDestructor()) 1918 continue; 1919 1920 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1921 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1922 PDiag(diag::err_access_dtor_vbase) 1923 << VBase->getType()); 1924 1925 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1926 } 1927} 1928 1929void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1930 if (!CDtorDecl) 1931 return; 1932 1933 if (CXXConstructorDecl *Constructor 1934 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1935 SetBaseOrMemberInitializers(Constructor, 0, 0, 1936 /*IsImplicitConstructor=*/false, 1937 /*AnyErrors=*/false); 1938} 1939 1940bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1941 unsigned DiagID, AbstractDiagSelID SelID, 1942 const CXXRecordDecl *CurrentRD) { 1943 if (SelID == -1) 1944 return RequireNonAbstractType(Loc, T, 1945 PDiag(DiagID), CurrentRD); 1946 else 1947 return RequireNonAbstractType(Loc, T, 1948 PDiag(DiagID) << SelID, CurrentRD); 1949} 1950 1951bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1952 const PartialDiagnostic &PD, 1953 const CXXRecordDecl *CurrentRD) { 1954 if (!getLangOptions().CPlusPlus) 1955 return false; 1956 1957 if (const ArrayType *AT = Context.getAsArrayType(T)) 1958 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1959 CurrentRD); 1960 1961 if (const PointerType *PT = T->getAs<PointerType>()) { 1962 // Find the innermost pointer type. 1963 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1964 PT = T; 1965 1966 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1967 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1968 } 1969 1970 const RecordType *RT = T->getAs<RecordType>(); 1971 if (!RT) 1972 return false; 1973 1974 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1975 1976 if (CurrentRD && CurrentRD != RD) 1977 return false; 1978 1979 // FIXME: is this reasonable? It matches current behavior, but.... 1980 if (!RD->getDefinition()) 1981 return false; 1982 1983 if (!RD->isAbstract()) 1984 return false; 1985 1986 Diag(Loc, PD) << RD->getDeclName(); 1987 1988 // Check if we've already emitted the list of pure virtual functions for this 1989 // class. 1990 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1991 return true; 1992 1993 CXXFinalOverriderMap FinalOverriders; 1994 RD->getFinalOverriders(FinalOverriders); 1995 1996 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 1997 MEnd = FinalOverriders.end(); 1998 M != MEnd; 1999 ++M) { 2000 for (OverridingMethods::iterator SO = M->second.begin(), 2001 SOEnd = M->second.end(); 2002 SO != SOEnd; ++SO) { 2003 // C++ [class.abstract]p4: 2004 // A class is abstract if it contains or inherits at least one 2005 // pure virtual function for which the final overrider is pure 2006 // virtual. 2007 2008 // 2009 if (SO->second.size() != 1) 2010 continue; 2011 2012 if (!SO->second.front().Method->isPure()) 2013 continue; 2014 2015 Diag(SO->second.front().Method->getLocation(), 2016 diag::note_pure_virtual_function) 2017 << SO->second.front().Method->getDeclName(); 2018 } 2019 } 2020 2021 if (!PureVirtualClassDiagSet) 2022 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2023 PureVirtualClassDiagSet->insert(RD); 2024 2025 return true; 2026} 2027 2028namespace { 2029 class AbstractClassUsageDiagnoser 2030 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2031 Sema &SemaRef; 2032 CXXRecordDecl *AbstractClass; 2033 2034 bool VisitDeclContext(const DeclContext *DC) { 2035 bool Invalid = false; 2036 2037 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2038 E = DC->decls_end(); I != E; ++I) 2039 Invalid |= Visit(*I); 2040 2041 return Invalid; 2042 } 2043 2044 public: 2045 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2046 : SemaRef(SemaRef), AbstractClass(ac) { 2047 Visit(SemaRef.Context.getTranslationUnitDecl()); 2048 } 2049 2050 bool VisitFunctionDecl(const FunctionDecl *FD) { 2051 if (FD->isThisDeclarationADefinition()) { 2052 // No need to do the check if we're in a definition, because it requires 2053 // that the return/param types are complete. 2054 // because that requires 2055 return VisitDeclContext(FD); 2056 } 2057 2058 // Check the return type. 2059 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2060 bool Invalid = 2061 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2062 diag::err_abstract_type_in_decl, 2063 Sema::AbstractReturnType, 2064 AbstractClass); 2065 2066 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2067 E = FD->param_end(); I != E; ++I) { 2068 const ParmVarDecl *VD = *I; 2069 Invalid |= 2070 SemaRef.RequireNonAbstractType(VD->getLocation(), 2071 VD->getOriginalType(), 2072 diag::err_abstract_type_in_decl, 2073 Sema::AbstractParamType, 2074 AbstractClass); 2075 } 2076 2077 return Invalid; 2078 } 2079 2080 bool VisitDecl(const Decl* D) { 2081 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2082 return VisitDeclContext(DC); 2083 2084 return false; 2085 } 2086 }; 2087} 2088 2089/// \brief Perform semantic checks on a class definition that has been 2090/// completing, introducing implicitly-declared members, checking for 2091/// abstract types, etc. 2092void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2093 if (!Record || Record->isInvalidDecl()) 2094 return; 2095 2096 if (!Record->isDependentType()) 2097 AddImplicitlyDeclaredMembersToClass(Record); 2098 2099 if (Record->isInvalidDecl()) 2100 return; 2101 2102 // Set access bits correctly on the directly-declared conversions. 2103 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2104 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2105 Convs->setAccess(I, (*I)->getAccess()); 2106 2107 // Determine whether we need to check for final overriders. We do 2108 // this either when there are virtual base classes (in which case we 2109 // may end up finding multiple final overriders for a given virtual 2110 // function) or any of the base classes is abstract (in which case 2111 // we might detect that this class is abstract). 2112 bool CheckFinalOverriders = false; 2113 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2114 !Record->isDependentType()) { 2115 if (Record->getNumVBases()) 2116 CheckFinalOverriders = true; 2117 else if (!Record->isAbstract()) { 2118 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2119 BEnd = Record->bases_end(); 2120 B != BEnd; ++B) { 2121 CXXRecordDecl *BaseDecl 2122 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2123 if (BaseDecl->isAbstract()) { 2124 CheckFinalOverriders = true; 2125 break; 2126 } 2127 } 2128 } 2129 } 2130 2131 if (CheckFinalOverriders) { 2132 CXXFinalOverriderMap FinalOverriders; 2133 Record->getFinalOverriders(FinalOverriders); 2134 2135 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2136 MEnd = FinalOverriders.end(); 2137 M != MEnd; ++M) { 2138 for (OverridingMethods::iterator SO = M->second.begin(), 2139 SOEnd = M->second.end(); 2140 SO != SOEnd; ++SO) { 2141 assert(SO->second.size() > 0 && 2142 "All virtual functions have overridding virtual functions"); 2143 if (SO->second.size() == 1) { 2144 // C++ [class.abstract]p4: 2145 // A class is abstract if it contains or inherits at least one 2146 // pure virtual function for which the final overrider is pure 2147 // virtual. 2148 if (SO->second.front().Method->isPure()) 2149 Record->setAbstract(true); 2150 continue; 2151 } 2152 2153 // C++ [class.virtual]p2: 2154 // In a derived class, if a virtual member function of a base 2155 // class subobject has more than one final overrider the 2156 // program is ill-formed. 2157 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2158 << (NamedDecl *)M->first << Record; 2159 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2160 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2161 OMEnd = SO->second.end(); 2162 OM != OMEnd; ++OM) 2163 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2164 << (NamedDecl *)M->first << OM->Method->getParent(); 2165 2166 Record->setInvalidDecl(); 2167 } 2168 } 2169 } 2170 2171 if (Record->isAbstract() && !Record->isInvalidDecl()) 2172 (void)AbstractClassUsageDiagnoser(*this, Record); 2173} 2174 2175void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2176 DeclPtrTy TagDecl, 2177 SourceLocation LBrac, 2178 SourceLocation RBrac, 2179 AttributeList *AttrList) { 2180 if (!TagDecl) 2181 return; 2182 2183 AdjustDeclIfTemplate(TagDecl); 2184 2185 ActOnFields(S, RLoc, TagDecl, 2186 (DeclPtrTy*)FieldCollector->getCurFields(), 2187 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2188 2189 CheckCompletedCXXClass( 2190 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2191} 2192 2193/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2194/// special functions, such as the default constructor, copy 2195/// constructor, or destructor, to the given C++ class (C++ 2196/// [special]p1). This routine can only be executed just before the 2197/// definition of the class is complete. 2198void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2199 CanQualType ClassType 2200 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2201 2202 // FIXME: Implicit declarations have exception specifications, which are 2203 // the union of the specifications of the implicitly called functions. 2204 2205 if (!ClassDecl->hasUserDeclaredConstructor()) { 2206 // C++ [class.ctor]p5: 2207 // A default constructor for a class X is a constructor of class X 2208 // that can be called without an argument. If there is no 2209 // user-declared constructor for class X, a default constructor is 2210 // implicitly declared. An implicitly-declared default constructor 2211 // is an inline public member of its class. 2212 DeclarationName Name 2213 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2214 CXXConstructorDecl *DefaultCon = 2215 CXXConstructorDecl::Create(Context, ClassDecl, 2216 ClassDecl->getLocation(), Name, 2217 Context.getFunctionType(Context.VoidTy, 2218 0, 0, false, 0, 2219 /*FIXME*/false, false, 2220 0, 0, 2221 FunctionType::ExtInfo()), 2222 /*TInfo=*/0, 2223 /*isExplicit=*/false, 2224 /*isInline=*/true, 2225 /*isImplicitlyDeclared=*/true); 2226 DefaultCon->setAccess(AS_public); 2227 DefaultCon->setImplicit(); 2228 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2229 ClassDecl->addDecl(DefaultCon); 2230 } 2231 2232 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2233 // C++ [class.copy]p4: 2234 // If the class definition does not explicitly declare a copy 2235 // constructor, one is declared implicitly. 2236 2237 // C++ [class.copy]p5: 2238 // The implicitly-declared copy constructor for a class X will 2239 // have the form 2240 // 2241 // X::X(const X&) 2242 // 2243 // if 2244 bool HasConstCopyConstructor = true; 2245 2246 // -- each direct or virtual base class B of X has a copy 2247 // constructor whose first parameter is of type const B& or 2248 // const volatile B&, and 2249 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2250 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2251 const CXXRecordDecl *BaseClassDecl 2252 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2253 HasConstCopyConstructor 2254 = BaseClassDecl->hasConstCopyConstructor(Context); 2255 } 2256 2257 // -- for all the nonstatic data members of X that are of a 2258 // class type M (or array thereof), each such class type 2259 // has a copy constructor whose first parameter is of type 2260 // const M& or const volatile M&. 2261 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2262 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2263 ++Field) { 2264 QualType FieldType = (*Field)->getType(); 2265 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2266 FieldType = Array->getElementType(); 2267 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2268 const CXXRecordDecl *FieldClassDecl 2269 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2270 HasConstCopyConstructor 2271 = FieldClassDecl->hasConstCopyConstructor(Context); 2272 } 2273 } 2274 2275 // Otherwise, the implicitly declared copy constructor will have 2276 // the form 2277 // 2278 // X::X(X&) 2279 QualType ArgType = ClassType; 2280 if (HasConstCopyConstructor) 2281 ArgType = ArgType.withConst(); 2282 ArgType = Context.getLValueReferenceType(ArgType); 2283 2284 // An implicitly-declared copy constructor is an inline public 2285 // member of its class. 2286 DeclarationName Name 2287 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2288 CXXConstructorDecl *CopyConstructor 2289 = CXXConstructorDecl::Create(Context, ClassDecl, 2290 ClassDecl->getLocation(), Name, 2291 Context.getFunctionType(Context.VoidTy, 2292 &ArgType, 1, 2293 false, 0, 2294 /*FIXME:*/false, 2295 false, 0, 0, 2296 FunctionType::ExtInfo()), 2297 /*TInfo=*/0, 2298 /*isExplicit=*/false, 2299 /*isInline=*/true, 2300 /*isImplicitlyDeclared=*/true); 2301 CopyConstructor->setAccess(AS_public); 2302 CopyConstructor->setImplicit(); 2303 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2304 2305 // Add the parameter to the constructor. 2306 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2307 ClassDecl->getLocation(), 2308 /*IdentifierInfo=*/0, 2309 ArgType, /*TInfo=*/0, 2310 VarDecl::None, 0); 2311 CopyConstructor->setParams(&FromParam, 1); 2312 ClassDecl->addDecl(CopyConstructor); 2313 } 2314 2315 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2316 // Note: The following rules are largely analoguous to the copy 2317 // constructor rules. Note that virtual bases are not taken into account 2318 // for determining the argument type of the operator. Note also that 2319 // operators taking an object instead of a reference are allowed. 2320 // 2321 // C++ [class.copy]p10: 2322 // If the class definition does not explicitly declare a copy 2323 // assignment operator, one is declared implicitly. 2324 // The implicitly-defined copy assignment operator for a class X 2325 // will have the form 2326 // 2327 // X& X::operator=(const X&) 2328 // 2329 // if 2330 bool HasConstCopyAssignment = true; 2331 2332 // -- each direct base class B of X has a copy assignment operator 2333 // whose parameter is of type const B&, const volatile B& or B, 2334 // and 2335 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2336 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2337 assert(!Base->getType()->isDependentType() && 2338 "Cannot generate implicit members for class with dependent bases."); 2339 const CXXRecordDecl *BaseClassDecl 2340 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2341 const CXXMethodDecl *MD = 0; 2342 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2343 MD); 2344 } 2345 2346 // -- for all the nonstatic data members of X that are of a class 2347 // type M (or array thereof), each such class type has a copy 2348 // assignment operator whose parameter is of type const M&, 2349 // const volatile M& or M. 2350 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2351 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2352 ++Field) { 2353 QualType FieldType = (*Field)->getType(); 2354 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2355 FieldType = Array->getElementType(); 2356 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2357 const CXXRecordDecl *FieldClassDecl 2358 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2359 const CXXMethodDecl *MD = 0; 2360 HasConstCopyAssignment 2361 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2362 } 2363 } 2364 2365 // Otherwise, the implicitly declared copy assignment operator will 2366 // have the form 2367 // 2368 // X& X::operator=(X&) 2369 QualType ArgType = ClassType; 2370 QualType RetType = Context.getLValueReferenceType(ArgType); 2371 if (HasConstCopyAssignment) 2372 ArgType = ArgType.withConst(); 2373 ArgType = Context.getLValueReferenceType(ArgType); 2374 2375 // An implicitly-declared copy assignment operator is an inline public 2376 // member of its class. 2377 DeclarationName Name = 2378 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2379 CXXMethodDecl *CopyAssignment = 2380 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2381 Context.getFunctionType(RetType, &ArgType, 1, 2382 false, 0, 2383 /*FIXME:*/false, 2384 false, 0, 0, 2385 FunctionType::ExtInfo()), 2386 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2387 CopyAssignment->setAccess(AS_public); 2388 CopyAssignment->setImplicit(); 2389 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2390 CopyAssignment->setCopyAssignment(true); 2391 2392 // Add the parameter to the operator. 2393 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2394 ClassDecl->getLocation(), 2395 /*IdentifierInfo=*/0, 2396 ArgType, /*TInfo=*/0, 2397 VarDecl::None, 0); 2398 CopyAssignment->setParams(&FromParam, 1); 2399 2400 // Don't call addedAssignmentOperator. There is no way to distinguish an 2401 // implicit from an explicit assignment operator. 2402 ClassDecl->addDecl(CopyAssignment); 2403 AddOverriddenMethods(ClassDecl, CopyAssignment); 2404 } 2405 2406 if (!ClassDecl->hasUserDeclaredDestructor()) { 2407 // C++ [class.dtor]p2: 2408 // If a class has no user-declared destructor, a destructor is 2409 // declared implicitly. An implicitly-declared destructor is an 2410 // inline public member of its class. 2411 QualType Ty = Context.getFunctionType(Context.VoidTy, 2412 0, 0, false, 0, 2413 /*FIXME:*/false, 2414 false, 0, 0, FunctionType::ExtInfo()); 2415 2416 DeclarationName Name 2417 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2418 CXXDestructorDecl *Destructor 2419 = CXXDestructorDecl::Create(Context, ClassDecl, 2420 ClassDecl->getLocation(), Name, Ty, 2421 /*isInline=*/true, 2422 /*isImplicitlyDeclared=*/true); 2423 Destructor->setAccess(AS_public); 2424 Destructor->setImplicit(); 2425 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2426 ClassDecl->addDecl(Destructor); 2427 2428 // This could be uniqued if it ever proves significant. 2429 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2430 2431 AddOverriddenMethods(ClassDecl, Destructor); 2432 } 2433} 2434 2435void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2436 Decl *D = TemplateD.getAs<Decl>(); 2437 if (!D) 2438 return; 2439 2440 TemplateParameterList *Params = 0; 2441 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2442 Params = Template->getTemplateParameters(); 2443 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2444 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2445 Params = PartialSpec->getTemplateParameters(); 2446 else 2447 return; 2448 2449 for (TemplateParameterList::iterator Param = Params->begin(), 2450 ParamEnd = Params->end(); 2451 Param != ParamEnd; ++Param) { 2452 NamedDecl *Named = cast<NamedDecl>(*Param); 2453 if (Named->getDeclName()) { 2454 S->AddDecl(DeclPtrTy::make(Named)); 2455 IdResolver.AddDecl(Named); 2456 } 2457 } 2458} 2459 2460void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2461 if (!RecordD) return; 2462 AdjustDeclIfTemplate(RecordD); 2463 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2464 PushDeclContext(S, Record); 2465} 2466 2467void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2468 if (!RecordD) return; 2469 PopDeclContext(); 2470} 2471 2472/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2473/// parsing a top-level (non-nested) C++ class, and we are now 2474/// parsing those parts of the given Method declaration that could 2475/// not be parsed earlier (C++ [class.mem]p2), such as default 2476/// arguments. This action should enter the scope of the given 2477/// Method declaration as if we had just parsed the qualified method 2478/// name. However, it should not bring the parameters into scope; 2479/// that will be performed by ActOnDelayedCXXMethodParameter. 2480void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2481} 2482 2483/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2484/// C++ method declaration. We're (re-)introducing the given 2485/// function parameter into scope for use in parsing later parts of 2486/// the method declaration. For example, we could see an 2487/// ActOnParamDefaultArgument event for this parameter. 2488void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2489 if (!ParamD) 2490 return; 2491 2492 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2493 2494 // If this parameter has an unparsed default argument, clear it out 2495 // to make way for the parsed default argument. 2496 if (Param->hasUnparsedDefaultArg()) 2497 Param->setDefaultArg(0); 2498 2499 S->AddDecl(DeclPtrTy::make(Param)); 2500 if (Param->getDeclName()) 2501 IdResolver.AddDecl(Param); 2502} 2503 2504/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2505/// processing the delayed method declaration for Method. The method 2506/// declaration is now considered finished. There may be a separate 2507/// ActOnStartOfFunctionDef action later (not necessarily 2508/// immediately!) for this method, if it was also defined inside the 2509/// class body. 2510void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2511 if (!MethodD) 2512 return; 2513 2514 AdjustDeclIfTemplate(MethodD); 2515 2516 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2517 2518 // Now that we have our default arguments, check the constructor 2519 // again. It could produce additional diagnostics or affect whether 2520 // the class has implicitly-declared destructors, among other 2521 // things. 2522 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2523 CheckConstructor(Constructor); 2524 2525 // Check the default arguments, which we may have added. 2526 if (!Method->isInvalidDecl()) 2527 CheckCXXDefaultArguments(Method); 2528} 2529 2530/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2531/// the well-formedness of the constructor declarator @p D with type @p 2532/// R. If there are any errors in the declarator, this routine will 2533/// emit diagnostics and set the invalid bit to true. In any case, the type 2534/// will be updated to reflect a well-formed type for the constructor and 2535/// returned. 2536QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2537 FunctionDecl::StorageClass &SC) { 2538 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2539 2540 // C++ [class.ctor]p3: 2541 // A constructor shall not be virtual (10.3) or static (9.4). A 2542 // constructor can be invoked for a const, volatile or const 2543 // volatile object. A constructor shall not be declared const, 2544 // volatile, or const volatile (9.3.2). 2545 if (isVirtual) { 2546 if (!D.isInvalidType()) 2547 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2548 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2549 << SourceRange(D.getIdentifierLoc()); 2550 D.setInvalidType(); 2551 } 2552 if (SC == FunctionDecl::Static) { 2553 if (!D.isInvalidType()) 2554 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2555 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2556 << SourceRange(D.getIdentifierLoc()); 2557 D.setInvalidType(); 2558 SC = FunctionDecl::None; 2559 } 2560 2561 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2562 if (FTI.TypeQuals != 0) { 2563 if (FTI.TypeQuals & Qualifiers::Const) 2564 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2565 << "const" << SourceRange(D.getIdentifierLoc()); 2566 if (FTI.TypeQuals & Qualifiers::Volatile) 2567 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2568 << "volatile" << SourceRange(D.getIdentifierLoc()); 2569 if (FTI.TypeQuals & Qualifiers::Restrict) 2570 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2571 << "restrict" << SourceRange(D.getIdentifierLoc()); 2572 } 2573 2574 // Rebuild the function type "R" without any type qualifiers (in 2575 // case any of the errors above fired) and with "void" as the 2576 // return type, since constructors don't have return types. We 2577 // *always* have to do this, because GetTypeForDeclarator will 2578 // put in a result type of "int" when none was specified. 2579 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2580 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2581 Proto->getNumArgs(), 2582 Proto->isVariadic(), 0, 2583 Proto->hasExceptionSpec(), 2584 Proto->hasAnyExceptionSpec(), 2585 Proto->getNumExceptions(), 2586 Proto->exception_begin(), 2587 Proto->getExtInfo()); 2588} 2589 2590/// CheckConstructor - Checks a fully-formed constructor for 2591/// well-formedness, issuing any diagnostics required. Returns true if 2592/// the constructor declarator is invalid. 2593void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2594 CXXRecordDecl *ClassDecl 2595 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2596 if (!ClassDecl) 2597 return Constructor->setInvalidDecl(); 2598 2599 // C++ [class.copy]p3: 2600 // A declaration of a constructor for a class X is ill-formed if 2601 // its first parameter is of type (optionally cv-qualified) X and 2602 // either there are no other parameters or else all other 2603 // parameters have default arguments. 2604 if (!Constructor->isInvalidDecl() && 2605 ((Constructor->getNumParams() == 1) || 2606 (Constructor->getNumParams() > 1 && 2607 Constructor->getParamDecl(1)->hasDefaultArg())) && 2608 Constructor->getTemplateSpecializationKind() 2609 != TSK_ImplicitInstantiation) { 2610 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2611 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2612 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2613 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2614 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2615 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2616 2617 // FIXME: Rather that making the constructor invalid, we should endeavor 2618 // to fix the type. 2619 Constructor->setInvalidDecl(); 2620 } 2621 } 2622 2623 // Notify the class that we've added a constructor. 2624 ClassDecl->addedConstructor(Context, Constructor); 2625} 2626 2627/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2628/// issuing any diagnostics required. Returns true on error. 2629bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2630 CXXRecordDecl *RD = Destructor->getParent(); 2631 2632 if (Destructor->isVirtual()) { 2633 SourceLocation Loc; 2634 2635 if (!Destructor->isImplicit()) 2636 Loc = Destructor->getLocation(); 2637 else 2638 Loc = RD->getLocation(); 2639 2640 // If we have a virtual destructor, look up the deallocation function 2641 FunctionDecl *OperatorDelete = 0; 2642 DeclarationName Name = 2643 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2644 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2645 return true; 2646 2647 Destructor->setOperatorDelete(OperatorDelete); 2648 } 2649 2650 return false; 2651} 2652 2653static inline bool 2654FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2655 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2656 FTI.ArgInfo[0].Param && 2657 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2658} 2659 2660/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2661/// the well-formednes of the destructor declarator @p D with type @p 2662/// R. If there are any errors in the declarator, this routine will 2663/// emit diagnostics and set the declarator to invalid. Even if this happens, 2664/// will be updated to reflect a well-formed type for the destructor and 2665/// returned. 2666QualType Sema::CheckDestructorDeclarator(Declarator &D, 2667 FunctionDecl::StorageClass& SC) { 2668 // C++ [class.dtor]p1: 2669 // [...] A typedef-name that names a class is a class-name 2670 // (7.1.3); however, a typedef-name that names a class shall not 2671 // be used as the identifier in the declarator for a destructor 2672 // declaration. 2673 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2674 if (isa<TypedefType>(DeclaratorType)) { 2675 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2676 << DeclaratorType; 2677 D.setInvalidType(); 2678 } 2679 2680 // C++ [class.dtor]p2: 2681 // A destructor is used to destroy objects of its class type. A 2682 // destructor takes no parameters, and no return type can be 2683 // specified for it (not even void). The address of a destructor 2684 // shall not be taken. A destructor shall not be static. A 2685 // destructor can be invoked for a const, volatile or const 2686 // volatile object. A destructor shall not be declared const, 2687 // volatile or const volatile (9.3.2). 2688 if (SC == FunctionDecl::Static) { 2689 if (!D.isInvalidType()) 2690 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2691 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2692 << SourceRange(D.getIdentifierLoc()); 2693 SC = FunctionDecl::None; 2694 D.setInvalidType(); 2695 } 2696 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2697 // Destructors don't have return types, but the parser will 2698 // happily parse something like: 2699 // 2700 // class X { 2701 // float ~X(); 2702 // }; 2703 // 2704 // The return type will be eliminated later. 2705 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2706 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2707 << SourceRange(D.getIdentifierLoc()); 2708 } 2709 2710 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2711 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2712 if (FTI.TypeQuals & Qualifiers::Const) 2713 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2714 << "const" << SourceRange(D.getIdentifierLoc()); 2715 if (FTI.TypeQuals & Qualifiers::Volatile) 2716 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2717 << "volatile" << SourceRange(D.getIdentifierLoc()); 2718 if (FTI.TypeQuals & Qualifiers::Restrict) 2719 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2720 << "restrict" << SourceRange(D.getIdentifierLoc()); 2721 D.setInvalidType(); 2722 } 2723 2724 // Make sure we don't have any parameters. 2725 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2726 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2727 2728 // Delete the parameters. 2729 FTI.freeArgs(); 2730 D.setInvalidType(); 2731 } 2732 2733 // Make sure the destructor isn't variadic. 2734 if (FTI.isVariadic) { 2735 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2736 D.setInvalidType(); 2737 } 2738 2739 // Rebuild the function type "R" without any type qualifiers or 2740 // parameters (in case any of the errors above fired) and with 2741 // "void" as the return type, since destructors don't have return 2742 // types. We *always* have to do this, because GetTypeForDeclarator 2743 // will put in a result type of "int" when none was specified. 2744 // FIXME: Exceptions! 2745 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2746 false, false, 0, 0, FunctionType::ExtInfo()); 2747} 2748 2749/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2750/// well-formednes of the conversion function declarator @p D with 2751/// type @p R. If there are any errors in the declarator, this routine 2752/// will emit diagnostics and return true. Otherwise, it will return 2753/// false. Either way, the type @p R will be updated to reflect a 2754/// well-formed type for the conversion operator. 2755void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2756 FunctionDecl::StorageClass& SC) { 2757 // C++ [class.conv.fct]p1: 2758 // Neither parameter types nor return type can be specified. The 2759 // type of a conversion function (8.3.5) is "function taking no 2760 // parameter returning conversion-type-id." 2761 if (SC == FunctionDecl::Static) { 2762 if (!D.isInvalidType()) 2763 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2764 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2765 << SourceRange(D.getIdentifierLoc()); 2766 D.setInvalidType(); 2767 SC = FunctionDecl::None; 2768 } 2769 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2770 // Conversion functions don't have return types, but the parser will 2771 // happily parse something like: 2772 // 2773 // class X { 2774 // float operator bool(); 2775 // }; 2776 // 2777 // The return type will be changed later anyway. 2778 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2779 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2780 << SourceRange(D.getIdentifierLoc()); 2781 } 2782 2783 // Make sure we don't have any parameters. 2784 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2785 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2786 2787 // Delete the parameters. 2788 D.getTypeObject(0).Fun.freeArgs(); 2789 D.setInvalidType(); 2790 } 2791 2792 // Make sure the conversion function isn't variadic. 2793 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2794 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2795 D.setInvalidType(); 2796 } 2797 2798 // C++ [class.conv.fct]p4: 2799 // The conversion-type-id shall not represent a function type nor 2800 // an array type. 2801 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2802 if (ConvType->isArrayType()) { 2803 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2804 ConvType = Context.getPointerType(ConvType); 2805 D.setInvalidType(); 2806 } else if (ConvType->isFunctionType()) { 2807 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2808 ConvType = Context.getPointerType(ConvType); 2809 D.setInvalidType(); 2810 } 2811 2812 // Rebuild the function type "R" without any parameters (in case any 2813 // of the errors above fired) and with the conversion type as the 2814 // return type. 2815 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2816 R = Context.getFunctionType(ConvType, 0, 0, false, 2817 Proto->getTypeQuals(), 2818 Proto->hasExceptionSpec(), 2819 Proto->hasAnyExceptionSpec(), 2820 Proto->getNumExceptions(), 2821 Proto->exception_begin(), 2822 Proto->getExtInfo()); 2823 2824 // C++0x explicit conversion operators. 2825 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2826 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2827 diag::warn_explicit_conversion_functions) 2828 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2829} 2830 2831/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2832/// the declaration of the given C++ conversion function. This routine 2833/// is responsible for recording the conversion function in the C++ 2834/// class, if possible. 2835Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2836 assert(Conversion && "Expected to receive a conversion function declaration"); 2837 2838 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2839 2840 // Make sure we aren't redeclaring the conversion function. 2841 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2842 2843 // C++ [class.conv.fct]p1: 2844 // [...] A conversion function is never used to convert a 2845 // (possibly cv-qualified) object to the (possibly cv-qualified) 2846 // same object type (or a reference to it), to a (possibly 2847 // cv-qualified) base class of that type (or a reference to it), 2848 // or to (possibly cv-qualified) void. 2849 // FIXME: Suppress this warning if the conversion function ends up being a 2850 // virtual function that overrides a virtual function in a base class. 2851 QualType ClassType 2852 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2853 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2854 ConvType = ConvTypeRef->getPointeeType(); 2855 if (ConvType->isRecordType()) { 2856 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2857 if (ConvType == ClassType) 2858 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2859 << ClassType; 2860 else if (IsDerivedFrom(ClassType, ConvType)) 2861 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2862 << ClassType << ConvType; 2863 } else if (ConvType->isVoidType()) { 2864 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2865 << ClassType << ConvType; 2866 } 2867 2868 if (Conversion->getPrimaryTemplate()) { 2869 // ignore specializations 2870 } else if (Conversion->getPreviousDeclaration()) { 2871 if (FunctionTemplateDecl *ConversionTemplate 2872 = Conversion->getDescribedFunctionTemplate()) { 2873 if (ClassDecl->replaceConversion( 2874 ConversionTemplate->getPreviousDeclaration(), 2875 ConversionTemplate)) 2876 return DeclPtrTy::make(ConversionTemplate); 2877 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2878 Conversion)) 2879 return DeclPtrTy::make(Conversion); 2880 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2881 } else if (FunctionTemplateDecl *ConversionTemplate 2882 = Conversion->getDescribedFunctionTemplate()) 2883 ClassDecl->addConversionFunction(ConversionTemplate); 2884 else 2885 ClassDecl->addConversionFunction(Conversion); 2886 2887 return DeclPtrTy::make(Conversion); 2888} 2889 2890//===----------------------------------------------------------------------===// 2891// Namespace Handling 2892//===----------------------------------------------------------------------===// 2893 2894/// ActOnStartNamespaceDef - This is called at the start of a namespace 2895/// definition. 2896Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2897 SourceLocation IdentLoc, 2898 IdentifierInfo *II, 2899 SourceLocation LBrace, 2900 AttributeList *AttrList) { 2901 NamespaceDecl *Namespc = 2902 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2903 Namespc->setLBracLoc(LBrace); 2904 2905 Scope *DeclRegionScope = NamespcScope->getParent(); 2906 2907 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2908 2909 if (II) { 2910 // C++ [namespace.def]p2: 2911 // The identifier in an original-namespace-definition shall not have been 2912 // previously defined in the declarative region in which the 2913 // original-namespace-definition appears. The identifier in an 2914 // original-namespace-definition is the name of the namespace. Subsequently 2915 // in that declarative region, it is treated as an original-namespace-name. 2916 2917 NamedDecl *PrevDecl 2918 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2919 ForRedeclaration); 2920 2921 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2922 // This is an extended namespace definition. 2923 // Attach this namespace decl to the chain of extended namespace 2924 // definitions. 2925 OrigNS->setNextNamespace(Namespc); 2926 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2927 2928 // Remove the previous declaration from the scope. 2929 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2930 IdResolver.RemoveDecl(OrigNS); 2931 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2932 } 2933 } else if (PrevDecl) { 2934 // This is an invalid name redefinition. 2935 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2936 << Namespc->getDeclName(); 2937 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2938 Namespc->setInvalidDecl(); 2939 // Continue on to push Namespc as current DeclContext and return it. 2940 } else if (II->isStr("std") && 2941 CurContext->getLookupContext()->isTranslationUnit()) { 2942 // This is the first "real" definition of the namespace "std", so update 2943 // our cache of the "std" namespace to point at this definition. 2944 if (StdNamespace) { 2945 // We had already defined a dummy namespace "std". Link this new 2946 // namespace definition to the dummy namespace "std". 2947 StdNamespace->setNextNamespace(Namespc); 2948 StdNamespace->setLocation(IdentLoc); 2949 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2950 } 2951 2952 // Make our StdNamespace cache point at the first real definition of the 2953 // "std" namespace. 2954 StdNamespace = Namespc; 2955 } 2956 2957 PushOnScopeChains(Namespc, DeclRegionScope); 2958 } else { 2959 // Anonymous namespaces. 2960 assert(Namespc->isAnonymousNamespace()); 2961 2962 // Link the anonymous namespace into its parent. 2963 NamespaceDecl *PrevDecl; 2964 DeclContext *Parent = CurContext->getLookupContext(); 2965 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2966 PrevDecl = TU->getAnonymousNamespace(); 2967 TU->setAnonymousNamespace(Namespc); 2968 } else { 2969 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2970 PrevDecl = ND->getAnonymousNamespace(); 2971 ND->setAnonymousNamespace(Namespc); 2972 } 2973 2974 // Link the anonymous namespace with its previous declaration. 2975 if (PrevDecl) { 2976 assert(PrevDecl->isAnonymousNamespace()); 2977 assert(!PrevDecl->getNextNamespace()); 2978 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2979 PrevDecl->setNextNamespace(Namespc); 2980 } 2981 2982 CurContext->addDecl(Namespc); 2983 2984 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2985 // behaves as if it were replaced by 2986 // namespace unique { /* empty body */ } 2987 // using namespace unique; 2988 // namespace unique { namespace-body } 2989 // where all occurrences of 'unique' in a translation unit are 2990 // replaced by the same identifier and this identifier differs 2991 // from all other identifiers in the entire program. 2992 2993 // We just create the namespace with an empty name and then add an 2994 // implicit using declaration, just like the standard suggests. 2995 // 2996 // CodeGen enforces the "universally unique" aspect by giving all 2997 // declarations semantically contained within an anonymous 2998 // namespace internal linkage. 2999 3000 if (!PrevDecl) { 3001 UsingDirectiveDecl* UD 3002 = UsingDirectiveDecl::Create(Context, CurContext, 3003 /* 'using' */ LBrace, 3004 /* 'namespace' */ SourceLocation(), 3005 /* qualifier */ SourceRange(), 3006 /* NNS */ NULL, 3007 /* identifier */ SourceLocation(), 3008 Namespc, 3009 /* Ancestor */ CurContext); 3010 UD->setImplicit(); 3011 CurContext->addDecl(UD); 3012 } 3013 } 3014 3015 // Although we could have an invalid decl (i.e. the namespace name is a 3016 // redefinition), push it as current DeclContext and try to continue parsing. 3017 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3018 // for the namespace has the declarations that showed up in that particular 3019 // namespace definition. 3020 PushDeclContext(NamespcScope, Namespc); 3021 return DeclPtrTy::make(Namespc); 3022} 3023 3024/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3025/// is a namespace alias, returns the namespace it points to. 3026static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3027 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3028 return AD->getNamespace(); 3029 return dyn_cast_or_null<NamespaceDecl>(D); 3030} 3031 3032/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3033/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3034void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3035 Decl *Dcl = D.getAs<Decl>(); 3036 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3037 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3038 Namespc->setRBracLoc(RBrace); 3039 PopDeclContext(); 3040} 3041 3042Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3043 SourceLocation UsingLoc, 3044 SourceLocation NamespcLoc, 3045 const CXXScopeSpec &SS, 3046 SourceLocation IdentLoc, 3047 IdentifierInfo *NamespcName, 3048 AttributeList *AttrList) { 3049 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3050 assert(NamespcName && "Invalid NamespcName."); 3051 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3052 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3053 3054 UsingDirectiveDecl *UDir = 0; 3055 3056 // Lookup namespace name. 3057 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3058 LookupParsedName(R, S, &SS); 3059 if (R.isAmbiguous()) 3060 return DeclPtrTy(); 3061 3062 if (!R.empty()) { 3063 NamedDecl *Named = R.getFoundDecl(); 3064 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3065 && "expected namespace decl"); 3066 // C++ [namespace.udir]p1: 3067 // A using-directive specifies that the names in the nominated 3068 // namespace can be used in the scope in which the 3069 // using-directive appears after the using-directive. During 3070 // unqualified name lookup (3.4.1), the names appear as if they 3071 // were declared in the nearest enclosing namespace which 3072 // contains both the using-directive and the nominated 3073 // namespace. [Note: in this context, "contains" means "contains 3074 // directly or indirectly". ] 3075 3076 // Find enclosing context containing both using-directive and 3077 // nominated namespace. 3078 NamespaceDecl *NS = getNamespaceDecl(Named); 3079 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3080 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3081 CommonAncestor = CommonAncestor->getParent(); 3082 3083 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3084 SS.getRange(), 3085 (NestedNameSpecifier *)SS.getScopeRep(), 3086 IdentLoc, Named, CommonAncestor); 3087 PushUsingDirective(S, UDir); 3088 } else { 3089 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3090 } 3091 3092 // FIXME: We ignore attributes for now. 3093 delete AttrList; 3094 return DeclPtrTy::make(UDir); 3095} 3096 3097void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3098 // If scope has associated entity, then using directive is at namespace 3099 // or translation unit scope. We add UsingDirectiveDecls, into 3100 // it's lookup structure. 3101 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3102 Ctx->addDecl(UDir); 3103 else 3104 // Otherwise it is block-sope. using-directives will affect lookup 3105 // only to the end of scope. 3106 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3107} 3108 3109 3110Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3111 AccessSpecifier AS, 3112 bool HasUsingKeyword, 3113 SourceLocation UsingLoc, 3114 const CXXScopeSpec &SS, 3115 UnqualifiedId &Name, 3116 AttributeList *AttrList, 3117 bool IsTypeName, 3118 SourceLocation TypenameLoc) { 3119 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3120 3121 switch (Name.getKind()) { 3122 case UnqualifiedId::IK_Identifier: 3123 case UnqualifiedId::IK_OperatorFunctionId: 3124 case UnqualifiedId::IK_LiteralOperatorId: 3125 case UnqualifiedId::IK_ConversionFunctionId: 3126 break; 3127 3128 case UnqualifiedId::IK_ConstructorName: 3129 case UnqualifiedId::IK_ConstructorTemplateId: 3130 // C++0x inherited constructors. 3131 if (getLangOptions().CPlusPlus0x) break; 3132 3133 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3134 << SS.getRange(); 3135 return DeclPtrTy(); 3136 3137 case UnqualifiedId::IK_DestructorName: 3138 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3139 << SS.getRange(); 3140 return DeclPtrTy(); 3141 3142 case UnqualifiedId::IK_TemplateId: 3143 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3144 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3145 return DeclPtrTy(); 3146 } 3147 3148 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3149 if (!TargetName) 3150 return DeclPtrTy(); 3151 3152 // Warn about using declarations. 3153 // TODO: store that the declaration was written without 'using' and 3154 // talk about access decls instead of using decls in the 3155 // diagnostics. 3156 if (!HasUsingKeyword) { 3157 UsingLoc = Name.getSourceRange().getBegin(); 3158 3159 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3160 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3161 "using "); 3162 } 3163 3164 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3165 Name.getSourceRange().getBegin(), 3166 TargetName, AttrList, 3167 /* IsInstantiation */ false, 3168 IsTypeName, TypenameLoc); 3169 if (UD) 3170 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3171 3172 return DeclPtrTy::make(UD); 3173} 3174 3175/// Determines whether to create a using shadow decl for a particular 3176/// decl, given the set of decls existing prior to this using lookup. 3177bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3178 const LookupResult &Previous) { 3179 // Diagnose finding a decl which is not from a base class of the 3180 // current class. We do this now because there are cases where this 3181 // function will silently decide not to build a shadow decl, which 3182 // will pre-empt further diagnostics. 3183 // 3184 // We don't need to do this in C++0x because we do the check once on 3185 // the qualifier. 3186 // 3187 // FIXME: diagnose the following if we care enough: 3188 // struct A { int foo; }; 3189 // struct B : A { using A::foo; }; 3190 // template <class T> struct C : A {}; 3191 // template <class T> struct D : C<T> { using B::foo; } // <--- 3192 // This is invalid (during instantiation) in C++03 because B::foo 3193 // resolves to the using decl in B, which is not a base class of D<T>. 3194 // We can't diagnose it immediately because C<T> is an unknown 3195 // specialization. The UsingShadowDecl in D<T> then points directly 3196 // to A::foo, which will look well-formed when we instantiate. 3197 // The right solution is to not collapse the shadow-decl chain. 3198 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3199 DeclContext *OrigDC = Orig->getDeclContext(); 3200 3201 // Handle enums and anonymous structs. 3202 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3203 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3204 while (OrigRec->isAnonymousStructOrUnion()) 3205 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3206 3207 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3208 if (OrigDC == CurContext) { 3209 Diag(Using->getLocation(), 3210 diag::err_using_decl_nested_name_specifier_is_current_class) 3211 << Using->getNestedNameRange(); 3212 Diag(Orig->getLocation(), diag::note_using_decl_target); 3213 return true; 3214 } 3215 3216 Diag(Using->getNestedNameRange().getBegin(), 3217 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3218 << Using->getTargetNestedNameDecl() 3219 << cast<CXXRecordDecl>(CurContext) 3220 << Using->getNestedNameRange(); 3221 Diag(Orig->getLocation(), diag::note_using_decl_target); 3222 return true; 3223 } 3224 } 3225 3226 if (Previous.empty()) return false; 3227 3228 NamedDecl *Target = Orig; 3229 if (isa<UsingShadowDecl>(Target)) 3230 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3231 3232 // If the target happens to be one of the previous declarations, we 3233 // don't have a conflict. 3234 // 3235 // FIXME: but we might be increasing its access, in which case we 3236 // should redeclare it. 3237 NamedDecl *NonTag = 0, *Tag = 0; 3238 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3239 I != E; ++I) { 3240 NamedDecl *D = (*I)->getUnderlyingDecl(); 3241 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3242 return false; 3243 3244 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3245 } 3246 3247 if (Target->isFunctionOrFunctionTemplate()) { 3248 FunctionDecl *FD; 3249 if (isa<FunctionTemplateDecl>(Target)) 3250 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3251 else 3252 FD = cast<FunctionDecl>(Target); 3253 3254 NamedDecl *OldDecl = 0; 3255 switch (CheckOverload(FD, Previous, OldDecl)) { 3256 case Ovl_Overload: 3257 return false; 3258 3259 case Ovl_NonFunction: 3260 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3261 break; 3262 3263 // We found a decl with the exact signature. 3264 case Ovl_Match: 3265 if (isa<UsingShadowDecl>(OldDecl)) { 3266 // Silently ignore the possible conflict. 3267 return false; 3268 } 3269 3270 // If we're in a record, we want to hide the target, so we 3271 // return true (without a diagnostic) to tell the caller not to 3272 // build a shadow decl. 3273 if (CurContext->isRecord()) 3274 return true; 3275 3276 // If we're not in a record, this is an error. 3277 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3278 break; 3279 } 3280 3281 Diag(Target->getLocation(), diag::note_using_decl_target); 3282 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3283 return true; 3284 } 3285 3286 // Target is not a function. 3287 3288 if (isa<TagDecl>(Target)) { 3289 // No conflict between a tag and a non-tag. 3290 if (!Tag) return false; 3291 3292 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3293 Diag(Target->getLocation(), diag::note_using_decl_target); 3294 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3295 return true; 3296 } 3297 3298 // No conflict between a tag and a non-tag. 3299 if (!NonTag) return false; 3300 3301 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3302 Diag(Target->getLocation(), diag::note_using_decl_target); 3303 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3304 return true; 3305} 3306 3307/// Builds a shadow declaration corresponding to a 'using' declaration. 3308UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3309 UsingDecl *UD, 3310 NamedDecl *Orig) { 3311 3312 // If we resolved to another shadow declaration, just coalesce them. 3313 NamedDecl *Target = Orig; 3314 if (isa<UsingShadowDecl>(Target)) { 3315 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3316 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3317 } 3318 3319 UsingShadowDecl *Shadow 3320 = UsingShadowDecl::Create(Context, CurContext, 3321 UD->getLocation(), UD, Target); 3322 UD->addShadowDecl(Shadow); 3323 3324 if (S) 3325 PushOnScopeChains(Shadow, S); 3326 else 3327 CurContext->addDecl(Shadow); 3328 Shadow->setAccess(UD->getAccess()); 3329 3330 // Register it as a conversion if appropriate. 3331 if (Shadow->getDeclName().getNameKind() 3332 == DeclarationName::CXXConversionFunctionName) 3333 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3334 3335 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3336 Shadow->setInvalidDecl(); 3337 3338 return Shadow; 3339} 3340 3341/// Hides a using shadow declaration. This is required by the current 3342/// using-decl implementation when a resolvable using declaration in a 3343/// class is followed by a declaration which would hide or override 3344/// one or more of the using decl's targets; for example: 3345/// 3346/// struct Base { void foo(int); }; 3347/// struct Derived : Base { 3348/// using Base::foo; 3349/// void foo(int); 3350/// }; 3351/// 3352/// The governing language is C++03 [namespace.udecl]p12: 3353/// 3354/// When a using-declaration brings names from a base class into a 3355/// derived class scope, member functions in the derived class 3356/// override and/or hide member functions with the same name and 3357/// parameter types in a base class (rather than conflicting). 3358/// 3359/// There are two ways to implement this: 3360/// (1) optimistically create shadow decls when they're not hidden 3361/// by existing declarations, or 3362/// (2) don't create any shadow decls (or at least don't make them 3363/// visible) until we've fully parsed/instantiated the class. 3364/// The problem with (1) is that we might have to retroactively remove 3365/// a shadow decl, which requires several O(n) operations because the 3366/// decl structures are (very reasonably) not designed for removal. 3367/// (2) avoids this but is very fiddly and phase-dependent. 3368void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3369 if (Shadow->getDeclName().getNameKind() == 3370 DeclarationName::CXXConversionFunctionName) 3371 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3372 3373 // Remove it from the DeclContext... 3374 Shadow->getDeclContext()->removeDecl(Shadow); 3375 3376 // ...and the scope, if applicable... 3377 if (S) { 3378 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3379 IdResolver.RemoveDecl(Shadow); 3380 } 3381 3382 // ...and the using decl. 3383 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3384 3385 // TODO: complain somehow if Shadow was used. It shouldn't 3386 // be possible for this to happen, because...? 3387} 3388 3389/// Builds a using declaration. 3390/// 3391/// \param IsInstantiation - Whether this call arises from an 3392/// instantiation of an unresolved using declaration. We treat 3393/// the lookup differently for these declarations. 3394NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3395 SourceLocation UsingLoc, 3396 const CXXScopeSpec &SS, 3397 SourceLocation IdentLoc, 3398 DeclarationName Name, 3399 AttributeList *AttrList, 3400 bool IsInstantiation, 3401 bool IsTypeName, 3402 SourceLocation TypenameLoc) { 3403 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3404 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3405 3406 // FIXME: We ignore attributes for now. 3407 delete AttrList; 3408 3409 if (SS.isEmpty()) { 3410 Diag(IdentLoc, diag::err_using_requires_qualname); 3411 return 0; 3412 } 3413 3414 // Do the redeclaration lookup in the current scope. 3415 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3416 ForRedeclaration); 3417 Previous.setHideTags(false); 3418 if (S) { 3419 LookupName(Previous, S); 3420 3421 // It is really dumb that we have to do this. 3422 LookupResult::Filter F = Previous.makeFilter(); 3423 while (F.hasNext()) { 3424 NamedDecl *D = F.next(); 3425 if (!isDeclInScope(D, CurContext, S)) 3426 F.erase(); 3427 } 3428 F.done(); 3429 } else { 3430 assert(IsInstantiation && "no scope in non-instantiation"); 3431 assert(CurContext->isRecord() && "scope not record in instantiation"); 3432 LookupQualifiedName(Previous, CurContext); 3433 } 3434 3435 NestedNameSpecifier *NNS = 3436 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3437 3438 // Check for invalid redeclarations. 3439 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3440 return 0; 3441 3442 // Check for bad qualifiers. 3443 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3444 return 0; 3445 3446 DeclContext *LookupContext = computeDeclContext(SS); 3447 NamedDecl *D; 3448 if (!LookupContext) { 3449 if (IsTypeName) { 3450 // FIXME: not all declaration name kinds are legal here 3451 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3452 UsingLoc, TypenameLoc, 3453 SS.getRange(), NNS, 3454 IdentLoc, Name); 3455 } else { 3456 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3457 UsingLoc, SS.getRange(), NNS, 3458 IdentLoc, Name); 3459 } 3460 } else { 3461 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3462 SS.getRange(), UsingLoc, NNS, Name, 3463 IsTypeName); 3464 } 3465 D->setAccess(AS); 3466 CurContext->addDecl(D); 3467 3468 if (!LookupContext) return D; 3469 UsingDecl *UD = cast<UsingDecl>(D); 3470 3471 if (RequireCompleteDeclContext(SS)) { 3472 UD->setInvalidDecl(); 3473 return UD; 3474 } 3475 3476 // Look up the target name. 3477 3478 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3479 3480 // Unlike most lookups, we don't always want to hide tag 3481 // declarations: tag names are visible through the using declaration 3482 // even if hidden by ordinary names, *except* in a dependent context 3483 // where it's important for the sanity of two-phase lookup. 3484 if (!IsInstantiation) 3485 R.setHideTags(false); 3486 3487 LookupQualifiedName(R, LookupContext); 3488 3489 if (R.empty()) { 3490 Diag(IdentLoc, diag::err_no_member) 3491 << Name << LookupContext << SS.getRange(); 3492 UD->setInvalidDecl(); 3493 return UD; 3494 } 3495 3496 if (R.isAmbiguous()) { 3497 UD->setInvalidDecl(); 3498 return UD; 3499 } 3500 3501 if (IsTypeName) { 3502 // If we asked for a typename and got a non-type decl, error out. 3503 if (!R.getAsSingle<TypeDecl>()) { 3504 Diag(IdentLoc, diag::err_using_typename_non_type); 3505 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3506 Diag((*I)->getUnderlyingDecl()->getLocation(), 3507 diag::note_using_decl_target); 3508 UD->setInvalidDecl(); 3509 return UD; 3510 } 3511 } else { 3512 // If we asked for a non-typename and we got a type, error out, 3513 // but only if this is an instantiation of an unresolved using 3514 // decl. Otherwise just silently find the type name. 3515 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3516 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3517 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3518 UD->setInvalidDecl(); 3519 return UD; 3520 } 3521 } 3522 3523 // C++0x N2914 [namespace.udecl]p6: 3524 // A using-declaration shall not name a namespace. 3525 if (R.getAsSingle<NamespaceDecl>()) { 3526 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3527 << SS.getRange(); 3528 UD->setInvalidDecl(); 3529 return UD; 3530 } 3531 3532 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3533 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3534 BuildUsingShadowDecl(S, UD, *I); 3535 } 3536 3537 return UD; 3538} 3539 3540/// Checks that the given using declaration is not an invalid 3541/// redeclaration. Note that this is checking only for the using decl 3542/// itself, not for any ill-formedness among the UsingShadowDecls. 3543bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3544 bool isTypeName, 3545 const CXXScopeSpec &SS, 3546 SourceLocation NameLoc, 3547 const LookupResult &Prev) { 3548 // C++03 [namespace.udecl]p8: 3549 // C++0x [namespace.udecl]p10: 3550 // A using-declaration is a declaration and can therefore be used 3551 // repeatedly where (and only where) multiple declarations are 3552 // allowed. 3553 // That's only in file contexts. 3554 if (CurContext->getLookupContext()->isFileContext()) 3555 return false; 3556 3557 NestedNameSpecifier *Qual 3558 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3559 3560 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3561 NamedDecl *D = *I; 3562 3563 bool DTypename; 3564 NestedNameSpecifier *DQual; 3565 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3566 DTypename = UD->isTypeName(); 3567 DQual = UD->getTargetNestedNameDecl(); 3568 } else if (UnresolvedUsingValueDecl *UD 3569 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3570 DTypename = false; 3571 DQual = UD->getTargetNestedNameSpecifier(); 3572 } else if (UnresolvedUsingTypenameDecl *UD 3573 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3574 DTypename = true; 3575 DQual = UD->getTargetNestedNameSpecifier(); 3576 } else continue; 3577 3578 // using decls differ if one says 'typename' and the other doesn't. 3579 // FIXME: non-dependent using decls? 3580 if (isTypeName != DTypename) continue; 3581 3582 // using decls differ if they name different scopes (but note that 3583 // template instantiation can cause this check to trigger when it 3584 // didn't before instantiation). 3585 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3586 Context.getCanonicalNestedNameSpecifier(DQual)) 3587 continue; 3588 3589 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3590 Diag(D->getLocation(), diag::note_using_decl) << 1; 3591 return true; 3592 } 3593 3594 return false; 3595} 3596 3597 3598/// Checks that the given nested-name qualifier used in a using decl 3599/// in the current context is appropriately related to the current 3600/// scope. If an error is found, diagnoses it and returns true. 3601bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3602 const CXXScopeSpec &SS, 3603 SourceLocation NameLoc) { 3604 DeclContext *NamedContext = computeDeclContext(SS); 3605 3606 if (!CurContext->isRecord()) { 3607 // C++03 [namespace.udecl]p3: 3608 // C++0x [namespace.udecl]p8: 3609 // A using-declaration for a class member shall be a member-declaration. 3610 3611 // If we weren't able to compute a valid scope, it must be a 3612 // dependent class scope. 3613 if (!NamedContext || NamedContext->isRecord()) { 3614 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3615 << SS.getRange(); 3616 return true; 3617 } 3618 3619 // Otherwise, everything is known to be fine. 3620 return false; 3621 } 3622 3623 // The current scope is a record. 3624 3625 // If the named context is dependent, we can't decide much. 3626 if (!NamedContext) { 3627 // FIXME: in C++0x, we can diagnose if we can prove that the 3628 // nested-name-specifier does not refer to a base class, which is 3629 // still possible in some cases. 3630 3631 // Otherwise we have to conservatively report that things might be 3632 // okay. 3633 return false; 3634 } 3635 3636 if (!NamedContext->isRecord()) { 3637 // Ideally this would point at the last name in the specifier, 3638 // but we don't have that level of source info. 3639 Diag(SS.getRange().getBegin(), 3640 diag::err_using_decl_nested_name_specifier_is_not_class) 3641 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3642 return true; 3643 } 3644 3645 if (getLangOptions().CPlusPlus0x) { 3646 // C++0x [namespace.udecl]p3: 3647 // In a using-declaration used as a member-declaration, the 3648 // nested-name-specifier shall name a base class of the class 3649 // being defined. 3650 3651 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3652 cast<CXXRecordDecl>(NamedContext))) { 3653 if (CurContext == NamedContext) { 3654 Diag(NameLoc, 3655 diag::err_using_decl_nested_name_specifier_is_current_class) 3656 << SS.getRange(); 3657 return true; 3658 } 3659 3660 Diag(SS.getRange().getBegin(), 3661 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3662 << (NestedNameSpecifier*) SS.getScopeRep() 3663 << cast<CXXRecordDecl>(CurContext) 3664 << SS.getRange(); 3665 return true; 3666 } 3667 3668 return false; 3669 } 3670 3671 // C++03 [namespace.udecl]p4: 3672 // A using-declaration used as a member-declaration shall refer 3673 // to a member of a base class of the class being defined [etc.]. 3674 3675 // Salient point: SS doesn't have to name a base class as long as 3676 // lookup only finds members from base classes. Therefore we can 3677 // diagnose here only if we can prove that that can't happen, 3678 // i.e. if the class hierarchies provably don't intersect. 3679 3680 // TODO: it would be nice if "definitely valid" results were cached 3681 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3682 // need to be repeated. 3683 3684 struct UserData { 3685 llvm::DenseSet<const CXXRecordDecl*> Bases; 3686 3687 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3688 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3689 Data->Bases.insert(Base); 3690 return true; 3691 } 3692 3693 bool hasDependentBases(const CXXRecordDecl *Class) { 3694 return !Class->forallBases(collect, this); 3695 } 3696 3697 /// Returns true if the base is dependent or is one of the 3698 /// accumulated base classes. 3699 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3700 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3701 return !Data->Bases.count(Base); 3702 } 3703 3704 bool mightShareBases(const CXXRecordDecl *Class) { 3705 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3706 } 3707 }; 3708 3709 UserData Data; 3710 3711 // Returns false if we find a dependent base. 3712 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3713 return false; 3714 3715 // Returns false if the class has a dependent base or if it or one 3716 // of its bases is present in the base set of the current context. 3717 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3718 return false; 3719 3720 Diag(SS.getRange().getBegin(), 3721 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3722 << (NestedNameSpecifier*) SS.getScopeRep() 3723 << cast<CXXRecordDecl>(CurContext) 3724 << SS.getRange(); 3725 3726 return true; 3727} 3728 3729Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3730 SourceLocation NamespaceLoc, 3731 SourceLocation AliasLoc, 3732 IdentifierInfo *Alias, 3733 const CXXScopeSpec &SS, 3734 SourceLocation IdentLoc, 3735 IdentifierInfo *Ident) { 3736 3737 // Lookup the namespace name. 3738 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3739 LookupParsedName(R, S, &SS); 3740 3741 // Check if we have a previous declaration with the same name. 3742 if (NamedDecl *PrevDecl 3743 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3744 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3745 // We already have an alias with the same name that points to the same 3746 // namespace, so don't create a new one. 3747 // FIXME: At some point, we'll want to create the (redundant) 3748 // declaration to maintain better source information. 3749 if (!R.isAmbiguous() && !R.empty() && 3750 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3751 return DeclPtrTy(); 3752 } 3753 3754 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3755 diag::err_redefinition_different_kind; 3756 Diag(AliasLoc, DiagID) << Alias; 3757 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3758 return DeclPtrTy(); 3759 } 3760 3761 if (R.isAmbiguous()) 3762 return DeclPtrTy(); 3763 3764 if (R.empty()) { 3765 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3766 return DeclPtrTy(); 3767 } 3768 3769 NamespaceAliasDecl *AliasDecl = 3770 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3771 Alias, SS.getRange(), 3772 (NestedNameSpecifier *)SS.getScopeRep(), 3773 IdentLoc, R.getFoundDecl()); 3774 3775 PushOnScopeChains(AliasDecl, S); 3776 return DeclPtrTy::make(AliasDecl); 3777} 3778 3779void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3780 CXXConstructorDecl *Constructor) { 3781 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3782 !Constructor->isUsed()) && 3783 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3784 3785 CXXRecordDecl *ClassDecl 3786 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3787 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3788 3789 DeclContext *PreviousContext = CurContext; 3790 CurContext = Constructor; 3791 if (SetBaseOrMemberInitializers(Constructor, 0, 0, 3792 /*IsImplicitConstructor=*/true, 3793 /*AnyErrors=*/false)) { 3794 Diag(CurrentLocation, diag::note_member_synthesized_at) 3795 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3796 Constructor->setInvalidDecl(); 3797 } else { 3798 Constructor->setUsed(); 3799 } 3800 CurContext = PreviousContext; 3801} 3802 3803void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3804 CXXDestructorDecl *Destructor) { 3805 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3806 "DefineImplicitDestructor - call it for implicit default dtor"); 3807 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3808 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3809 3810 DeclContext *PreviousContext = CurContext; 3811 CurContext = Destructor; 3812 3813 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3814 Destructor->getParent()); 3815 3816 // FIXME: If CheckDestructor fails, we should emit a note about where the 3817 // implicit destructor was needed. 3818 if (CheckDestructor(Destructor)) { 3819 Diag(CurrentLocation, diag::note_member_synthesized_at) 3820 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3821 3822 Destructor->setInvalidDecl(); 3823 CurContext = PreviousContext; 3824 3825 return; 3826 } 3827 CurContext = PreviousContext; 3828 3829 Destructor->setUsed(); 3830} 3831 3832void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3833 CXXMethodDecl *MethodDecl) { 3834 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3835 MethodDecl->getOverloadedOperator() == OO_Equal && 3836 !MethodDecl->isUsed()) && 3837 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3838 3839 CXXRecordDecl *ClassDecl 3840 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3841 3842 DeclContext *PreviousContext = CurContext; 3843 CurContext = MethodDecl; 3844 3845 // C++[class.copy] p12 3846 // Before the implicitly-declared copy assignment operator for a class is 3847 // implicitly defined, all implicitly-declared copy assignment operators 3848 // for its direct base classes and its nonstatic data members shall have 3849 // been implicitly defined. 3850 bool err = false; 3851 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3852 E = ClassDecl->bases_end(); Base != E; ++Base) { 3853 CXXRecordDecl *BaseClassDecl 3854 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3855 if (CXXMethodDecl *BaseAssignOpMethod = 3856 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3857 BaseClassDecl)) { 3858 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3859 BaseAssignOpMethod, 3860 PDiag(diag::err_access_assign_base) 3861 << Base->getType()); 3862 3863 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3864 } 3865 } 3866 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3867 E = ClassDecl->field_end(); Field != E; ++Field) { 3868 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3869 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3870 FieldType = Array->getElementType(); 3871 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3872 CXXRecordDecl *FieldClassDecl 3873 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3874 if (CXXMethodDecl *FieldAssignOpMethod = 3875 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3876 FieldClassDecl)) { 3877 CheckDirectMemberAccess(Field->getLocation(), 3878 FieldAssignOpMethod, 3879 PDiag(diag::err_access_assign_field) 3880 << Field->getDeclName() << Field->getType()); 3881 3882 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3883 } 3884 } else if (FieldType->isReferenceType()) { 3885 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3886 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3887 Diag(Field->getLocation(), diag::note_declared_at); 3888 Diag(CurrentLocation, diag::note_first_required_here); 3889 err = true; 3890 } else if (FieldType.isConstQualified()) { 3891 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3892 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3893 Diag(Field->getLocation(), diag::note_declared_at); 3894 Diag(CurrentLocation, diag::note_first_required_here); 3895 err = true; 3896 } 3897 } 3898 if (!err) 3899 MethodDecl->setUsed(); 3900 3901 CurContext = PreviousContext; 3902} 3903 3904CXXMethodDecl * 3905Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3906 ParmVarDecl *ParmDecl, 3907 CXXRecordDecl *ClassDecl) { 3908 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3909 QualType RHSType(LHSType); 3910 // If class's assignment operator argument is const/volatile qualified, 3911 // look for operator = (const/volatile B&). Otherwise, look for 3912 // operator = (B&). 3913 RHSType = Context.getCVRQualifiedType(RHSType, 3914 ParmDecl->getType().getCVRQualifiers()); 3915 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3916 LHSType, 3917 SourceLocation())); 3918 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3919 RHSType, 3920 CurrentLocation)); 3921 Expr *Args[2] = { &*LHS, &*RHS }; 3922 OverloadCandidateSet CandidateSet(CurrentLocation); 3923 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3924 CandidateSet); 3925 OverloadCandidateSet::iterator Best; 3926 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3927 return cast<CXXMethodDecl>(Best->Function); 3928 assert(false && 3929 "getAssignOperatorMethod - copy assignment operator method not found"); 3930 return 0; 3931} 3932 3933void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3934 CXXConstructorDecl *CopyConstructor, 3935 unsigned TypeQuals) { 3936 assert((CopyConstructor->isImplicit() && 3937 CopyConstructor->isCopyConstructor(TypeQuals) && 3938 !CopyConstructor->isUsed()) && 3939 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3940 3941 CXXRecordDecl *ClassDecl 3942 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3943 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3944 3945 DeclContext *PreviousContext = CurContext; 3946 CurContext = CopyConstructor; 3947 3948 // C++ [class.copy] p209 3949 // Before the implicitly-declared copy constructor for a class is 3950 // implicitly defined, all the implicitly-declared copy constructors 3951 // for its base class and its non-static data members shall have been 3952 // implicitly defined. 3953 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3954 Base != ClassDecl->bases_end(); ++Base) { 3955 CXXRecordDecl *BaseClassDecl 3956 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3957 if (CXXConstructorDecl *BaseCopyCtor = 3958 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3959 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3960 BaseCopyCtor, 3961 PDiag(diag::err_access_copy_base) 3962 << Base->getType()); 3963 3964 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3965 } 3966 } 3967 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3968 FieldEnd = ClassDecl->field_end(); 3969 Field != FieldEnd; ++Field) { 3970 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3971 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3972 FieldType = Array->getElementType(); 3973 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3974 CXXRecordDecl *FieldClassDecl 3975 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3976 if (CXXConstructorDecl *FieldCopyCtor = 3977 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 3978 CheckDirectMemberAccess(Field->getLocation(), 3979 FieldCopyCtor, 3980 PDiag(diag::err_access_copy_field) 3981 << Field->getDeclName() << Field->getType()); 3982 3983 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3984 } 3985 } 3986 } 3987 CopyConstructor->setUsed(); 3988 3989 CurContext = PreviousContext; 3990} 3991 3992Sema::OwningExprResult 3993Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3994 CXXConstructorDecl *Constructor, 3995 MultiExprArg ExprArgs, 3996 bool RequiresZeroInit, 3997 bool BaseInitialization) { 3998 bool Elidable = false; 3999 4000 // C++ [class.copy]p15: 4001 // Whenever a temporary class object is copied using a copy constructor, and 4002 // this object and the copy have the same cv-unqualified type, an 4003 // implementation is permitted to treat the original and the copy as two 4004 // different ways of referring to the same object and not perform a copy at 4005 // all, even if the class copy constructor or destructor have side effects. 4006 4007 // FIXME: Is this enough? 4008 if (Constructor->isCopyConstructor()) { 4009 Expr *E = ((Expr **)ExprArgs.get())[0]; 4010 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4011 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4012 E = ICE->getSubExpr(); 4013 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 4014 E = FCE->getSubExpr(); 4015 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 4016 E = BE->getSubExpr(); 4017 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4018 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4019 E = ICE->getSubExpr(); 4020 4021 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 4022 Elidable = !CE->getCallReturnType()->isReferenceType(); 4023 else if (isa<CXXTemporaryObjectExpr>(E)) 4024 Elidable = true; 4025 else if (isa<CXXConstructExpr>(E)) 4026 Elidable = true; 4027 } 4028 4029 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4030 Elidable, move(ExprArgs), RequiresZeroInit, 4031 BaseInitialization); 4032} 4033 4034/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4035/// including handling of its default argument expressions. 4036Sema::OwningExprResult 4037Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4038 CXXConstructorDecl *Constructor, bool Elidable, 4039 MultiExprArg ExprArgs, 4040 bool RequiresZeroInit, 4041 bool BaseInitialization) { 4042 unsigned NumExprs = ExprArgs.size(); 4043 Expr **Exprs = (Expr **)ExprArgs.release(); 4044 4045 MarkDeclarationReferenced(ConstructLoc, Constructor); 4046 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4047 Constructor, Elidable, Exprs, NumExprs, 4048 RequiresZeroInit, BaseInitialization)); 4049} 4050 4051bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4052 CXXConstructorDecl *Constructor, 4053 MultiExprArg Exprs) { 4054 OwningExprResult TempResult = 4055 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4056 move(Exprs)); 4057 if (TempResult.isInvalid()) 4058 return true; 4059 4060 Expr *Temp = TempResult.takeAs<Expr>(); 4061 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4062 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4063 VD->setInit(Temp); 4064 4065 return false; 4066} 4067 4068void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4069 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4070 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4071 !ClassDecl->hasTrivialDestructor()) { 4072 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4073 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4074 CheckDestructorAccess(VD->getLocation(), Destructor, 4075 PDiag(diag::err_access_dtor_var) 4076 << VD->getDeclName() 4077 << VD->getType()); 4078 } 4079} 4080 4081/// AddCXXDirectInitializerToDecl - This action is called immediately after 4082/// ActOnDeclarator, when a C++ direct initializer is present. 4083/// e.g: "int x(1);" 4084void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4085 SourceLocation LParenLoc, 4086 MultiExprArg Exprs, 4087 SourceLocation *CommaLocs, 4088 SourceLocation RParenLoc) { 4089 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4090 Decl *RealDecl = Dcl.getAs<Decl>(); 4091 4092 // If there is no declaration, there was an error parsing it. Just ignore 4093 // the initializer. 4094 if (RealDecl == 0) 4095 return; 4096 4097 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4098 if (!VDecl) { 4099 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4100 RealDecl->setInvalidDecl(); 4101 return; 4102 } 4103 4104 // We will represent direct-initialization similarly to copy-initialization: 4105 // int x(1); -as-> int x = 1; 4106 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4107 // 4108 // Clients that want to distinguish between the two forms, can check for 4109 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4110 // A major benefit is that clients that don't particularly care about which 4111 // exactly form was it (like the CodeGen) can handle both cases without 4112 // special case code. 4113 4114 // C++ 8.5p11: 4115 // The form of initialization (using parentheses or '=') is generally 4116 // insignificant, but does matter when the entity being initialized has a 4117 // class type. 4118 QualType DeclInitType = VDecl->getType(); 4119 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4120 DeclInitType = Context.getBaseElementType(Array); 4121 4122 if (!VDecl->getType()->isDependentType() && 4123 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4124 diag::err_typecheck_decl_incomplete_type)) { 4125 VDecl->setInvalidDecl(); 4126 return; 4127 } 4128 4129 // The variable can not have an abstract class type. 4130 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4131 diag::err_abstract_type_in_decl, 4132 AbstractVariableType)) 4133 VDecl->setInvalidDecl(); 4134 4135 const VarDecl *Def; 4136 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4137 Diag(VDecl->getLocation(), diag::err_redefinition) 4138 << VDecl->getDeclName(); 4139 Diag(Def->getLocation(), diag::note_previous_definition); 4140 VDecl->setInvalidDecl(); 4141 return; 4142 } 4143 4144 // If either the declaration has a dependent type or if any of the 4145 // expressions is type-dependent, we represent the initialization 4146 // via a ParenListExpr for later use during template instantiation. 4147 if (VDecl->getType()->isDependentType() || 4148 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4149 // Let clients know that initialization was done with a direct initializer. 4150 VDecl->setCXXDirectInitializer(true); 4151 4152 // Store the initialization expressions as a ParenListExpr. 4153 unsigned NumExprs = Exprs.size(); 4154 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4155 (Expr **)Exprs.release(), 4156 NumExprs, RParenLoc)); 4157 return; 4158 } 4159 4160 // Capture the variable that is being initialized and the style of 4161 // initialization. 4162 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4163 4164 // FIXME: Poor source location information. 4165 InitializationKind Kind 4166 = InitializationKind::CreateDirect(VDecl->getLocation(), 4167 LParenLoc, RParenLoc); 4168 4169 InitializationSequence InitSeq(*this, Entity, Kind, 4170 (Expr**)Exprs.get(), Exprs.size()); 4171 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4172 if (Result.isInvalid()) { 4173 VDecl->setInvalidDecl(); 4174 return; 4175 } 4176 4177 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4178 VDecl->setInit(Result.takeAs<Expr>()); 4179 VDecl->setCXXDirectInitializer(true); 4180 4181 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4182 FinalizeVarWithDestructor(VDecl, Record); 4183} 4184 4185/// \brief Add the applicable constructor candidates for an initialization 4186/// by constructor. 4187static void AddConstructorInitializationCandidates(Sema &SemaRef, 4188 QualType ClassType, 4189 Expr **Args, 4190 unsigned NumArgs, 4191 InitializationKind Kind, 4192 OverloadCandidateSet &CandidateSet) { 4193 // C++ [dcl.init]p14: 4194 // If the initialization is direct-initialization, or if it is 4195 // copy-initialization where the cv-unqualified version of the 4196 // source type is the same class as, or a derived class of, the 4197 // class of the destination, constructors are considered. The 4198 // applicable constructors are enumerated (13.3.1.3), and the 4199 // best one is chosen through overload resolution (13.3). The 4200 // constructor so selected is called to initialize the object, 4201 // with the initializer expression(s) as its argument(s). If no 4202 // constructor applies, or the overload resolution is ambiguous, 4203 // the initialization is ill-formed. 4204 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4205 assert(ClassRec && "Can only initialize a class type here"); 4206 4207 // FIXME: When we decide not to synthesize the implicitly-declared 4208 // constructors, we'll need to make them appear here. 4209 4210 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4211 DeclarationName ConstructorName 4212 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4213 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4214 DeclContext::lookup_const_iterator Con, ConEnd; 4215 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4216 Con != ConEnd; ++Con) { 4217 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4218 4219 // Find the constructor (which may be a template). 4220 CXXConstructorDecl *Constructor = 0; 4221 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4222 if (ConstructorTmpl) 4223 Constructor 4224 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4225 else 4226 Constructor = cast<CXXConstructorDecl>(*Con); 4227 4228 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4229 (Kind.getKind() == InitializationKind::IK_Value) || 4230 (Kind.getKind() == InitializationKind::IK_Copy && 4231 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4232 ((Kind.getKind() == InitializationKind::IK_Default) && 4233 Constructor->isDefaultConstructor())) { 4234 if (ConstructorTmpl) 4235 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4236 /*ExplicitArgs*/ 0, 4237 Args, NumArgs, CandidateSet); 4238 else 4239 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4240 Args, NumArgs, CandidateSet); 4241 } 4242 } 4243} 4244 4245/// \brief Attempt to perform initialization by constructor 4246/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4247/// copy-initialization. 4248/// 4249/// This routine determines whether initialization by constructor is possible, 4250/// but it does not emit any diagnostics in the case where the initialization 4251/// is ill-formed. 4252/// 4253/// \param ClassType the type of the object being initialized, which must have 4254/// class type. 4255/// 4256/// \param Args the arguments provided to initialize the object 4257/// 4258/// \param NumArgs the number of arguments provided to initialize the object 4259/// 4260/// \param Kind the type of initialization being performed 4261/// 4262/// \returns the constructor used to initialize the object, if successful. 4263/// Otherwise, emits a diagnostic and returns NULL. 4264CXXConstructorDecl * 4265Sema::TryInitializationByConstructor(QualType ClassType, 4266 Expr **Args, unsigned NumArgs, 4267 SourceLocation Loc, 4268 InitializationKind Kind) { 4269 // Build the overload candidate set 4270 OverloadCandidateSet CandidateSet(Loc); 4271 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4272 CandidateSet); 4273 4274 // Determine whether we found a constructor we can use. 4275 OverloadCandidateSet::iterator Best; 4276 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4277 case OR_Success: 4278 case OR_Deleted: 4279 // We found a constructor. Return it. 4280 return cast<CXXConstructorDecl>(Best->Function); 4281 4282 case OR_No_Viable_Function: 4283 case OR_Ambiguous: 4284 // Overload resolution failed. Return nothing. 4285 return 0; 4286 } 4287 4288 // Silence GCC warning 4289 return 0; 4290} 4291 4292/// \brief Given a constructor and the set of arguments provided for the 4293/// constructor, convert the arguments and add any required default arguments 4294/// to form a proper call to this constructor. 4295/// 4296/// \returns true if an error occurred, false otherwise. 4297bool 4298Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4299 MultiExprArg ArgsPtr, 4300 SourceLocation Loc, 4301 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4302 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4303 unsigned NumArgs = ArgsPtr.size(); 4304 Expr **Args = (Expr **)ArgsPtr.get(); 4305 4306 const FunctionProtoType *Proto 4307 = Constructor->getType()->getAs<FunctionProtoType>(); 4308 assert(Proto && "Constructor without a prototype?"); 4309 unsigned NumArgsInProto = Proto->getNumArgs(); 4310 4311 // If too few arguments are available, we'll fill in the rest with defaults. 4312 if (NumArgs < NumArgsInProto) 4313 ConvertedArgs.reserve(NumArgsInProto); 4314 else 4315 ConvertedArgs.reserve(NumArgs); 4316 4317 VariadicCallType CallType = 4318 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4319 llvm::SmallVector<Expr *, 8> AllArgs; 4320 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4321 Proto, 0, Args, NumArgs, AllArgs, 4322 CallType); 4323 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4324 ConvertedArgs.push_back(AllArgs[i]); 4325 return Invalid; 4326} 4327 4328/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4329/// determine whether they are reference-related, 4330/// reference-compatible, reference-compatible with added 4331/// qualification, or incompatible, for use in C++ initialization by 4332/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4333/// type, and the first type (T1) is the pointee type of the reference 4334/// type being initialized. 4335Sema::ReferenceCompareResult 4336Sema::CompareReferenceRelationship(SourceLocation Loc, 4337 QualType OrigT1, QualType OrigT2, 4338 bool& DerivedToBase) { 4339 assert(!OrigT1->isReferenceType() && 4340 "T1 must be the pointee type of the reference type"); 4341 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4342 4343 QualType T1 = Context.getCanonicalType(OrigT1); 4344 QualType T2 = Context.getCanonicalType(OrigT2); 4345 Qualifiers T1Quals, T2Quals; 4346 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4347 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4348 4349 // C++ [dcl.init.ref]p4: 4350 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4351 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4352 // T1 is a base class of T2. 4353 if (UnqualT1 == UnqualT2) 4354 DerivedToBase = false; 4355 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4356 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4357 IsDerivedFrom(UnqualT2, UnqualT1)) 4358 DerivedToBase = true; 4359 else 4360 return Ref_Incompatible; 4361 4362 // At this point, we know that T1 and T2 are reference-related (at 4363 // least). 4364 4365 // If the type is an array type, promote the element qualifiers to the type 4366 // for comparison. 4367 if (isa<ArrayType>(T1) && T1Quals) 4368 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4369 if (isa<ArrayType>(T2) && T2Quals) 4370 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4371 4372 // C++ [dcl.init.ref]p4: 4373 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4374 // reference-related to T2 and cv1 is the same cv-qualification 4375 // as, or greater cv-qualification than, cv2. For purposes of 4376 // overload resolution, cases for which cv1 is greater 4377 // cv-qualification than cv2 are identified as 4378 // reference-compatible with added qualification (see 13.3.3.2). 4379 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4380 return Ref_Compatible; 4381 else if (T1.isMoreQualifiedThan(T2)) 4382 return Ref_Compatible_With_Added_Qualification; 4383 else 4384 return Ref_Related; 4385} 4386 4387/// CheckReferenceInit - Check the initialization of a reference 4388/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4389/// the initializer (either a simple initializer or an initializer 4390/// list), and DeclType is the type of the declaration. When ICS is 4391/// non-null, this routine will compute the implicit conversion 4392/// sequence according to C++ [over.ics.ref] and will not produce any 4393/// diagnostics; when ICS is null, it will emit diagnostics when any 4394/// errors are found. Either way, a return value of true indicates 4395/// that there was a failure, a return value of false indicates that 4396/// the reference initialization succeeded. 4397/// 4398/// When @p SuppressUserConversions, user-defined conversions are 4399/// suppressed. 4400/// When @p AllowExplicit, we also permit explicit user-defined 4401/// conversion functions. 4402/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4403/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4404/// This is used when this is called from a C-style cast. 4405bool 4406Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4407 SourceLocation DeclLoc, 4408 bool SuppressUserConversions, 4409 bool AllowExplicit, bool ForceRValue, 4410 ImplicitConversionSequence *ICS, 4411 bool IgnoreBaseAccess) { 4412 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4413 4414 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4415 QualType T2 = Init->getType(); 4416 4417 // If the initializer is the address of an overloaded function, try 4418 // to resolve the overloaded function. If all goes well, T2 is the 4419 // type of the resulting function. 4420 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4421 DeclAccessPair Found; 4422 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4423 ICS != 0, Found); 4424 if (Fn) { 4425 // Since we're performing this reference-initialization for 4426 // real, update the initializer with the resulting function. 4427 if (!ICS) { 4428 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4429 return true; 4430 4431 CheckAddressOfMemberAccess(Init, Found); 4432 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4433 } 4434 4435 T2 = Fn->getType(); 4436 } 4437 } 4438 4439 // Compute some basic properties of the types and the initializer. 4440 bool isRValRef = DeclType->isRValueReferenceType(); 4441 bool DerivedToBase = false; 4442 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4443 Init->isLvalue(Context); 4444 ReferenceCompareResult RefRelationship 4445 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4446 4447 // Most paths end in a failed conversion. 4448 if (ICS) { 4449 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4450 } 4451 4452 // C++ [dcl.init.ref]p5: 4453 // A reference to type "cv1 T1" is initialized by an expression 4454 // of type "cv2 T2" as follows: 4455 4456 // -- If the initializer expression 4457 4458 // Rvalue references cannot bind to lvalues (N2812). 4459 // There is absolutely no situation where they can. In particular, note that 4460 // this is ill-formed, even if B has a user-defined conversion to A&&: 4461 // B b; 4462 // A&& r = b; 4463 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4464 if (!ICS) 4465 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4466 << Init->getSourceRange(); 4467 return true; 4468 } 4469 4470 bool BindsDirectly = false; 4471 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4472 // reference-compatible with "cv2 T2," or 4473 // 4474 // Note that the bit-field check is skipped if we are just computing 4475 // the implicit conversion sequence (C++ [over.best.ics]p2). 4476 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4477 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4478 BindsDirectly = true; 4479 4480 if (ICS) { 4481 // C++ [over.ics.ref]p1: 4482 // When a parameter of reference type binds directly (8.5.3) 4483 // to an argument expression, the implicit conversion sequence 4484 // is the identity conversion, unless the argument expression 4485 // has a type that is a derived class of the parameter type, 4486 // in which case the implicit conversion sequence is a 4487 // derived-to-base Conversion (13.3.3.1). 4488 ICS->setStandard(); 4489 ICS->Standard.First = ICK_Identity; 4490 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4491 ICS->Standard.Third = ICK_Identity; 4492 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4493 ICS->Standard.setToType(0, T2); 4494 ICS->Standard.setToType(1, T1); 4495 ICS->Standard.setToType(2, T1); 4496 ICS->Standard.ReferenceBinding = true; 4497 ICS->Standard.DirectBinding = true; 4498 ICS->Standard.RRefBinding = false; 4499 ICS->Standard.CopyConstructor = 0; 4500 4501 // Nothing more to do: the inaccessibility/ambiguity check for 4502 // derived-to-base conversions is suppressed when we're 4503 // computing the implicit conversion sequence (C++ 4504 // [over.best.ics]p2). 4505 return false; 4506 } else { 4507 // Perform the conversion. 4508 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4509 if (DerivedToBase) 4510 CK = CastExpr::CK_DerivedToBase; 4511 else if(CheckExceptionSpecCompatibility(Init, T1)) 4512 return true; 4513 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4514 } 4515 } 4516 4517 // -- has a class type (i.e., T2 is a class type) and can be 4518 // implicitly converted to an lvalue of type "cv3 T3," 4519 // where "cv1 T1" is reference-compatible with "cv3 T3" 4520 // 92) (this conversion is selected by enumerating the 4521 // applicable conversion functions (13.3.1.6) and choosing 4522 // the best one through overload resolution (13.3)), 4523 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4524 !RequireCompleteType(DeclLoc, T2, 0)) { 4525 CXXRecordDecl *T2RecordDecl 4526 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4527 4528 OverloadCandidateSet CandidateSet(DeclLoc); 4529 const UnresolvedSetImpl *Conversions 4530 = T2RecordDecl->getVisibleConversionFunctions(); 4531 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4532 E = Conversions->end(); I != E; ++I) { 4533 NamedDecl *D = *I; 4534 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4535 if (isa<UsingShadowDecl>(D)) 4536 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4537 4538 FunctionTemplateDecl *ConvTemplate 4539 = dyn_cast<FunctionTemplateDecl>(D); 4540 CXXConversionDecl *Conv; 4541 if (ConvTemplate) 4542 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4543 else 4544 Conv = cast<CXXConversionDecl>(D); 4545 4546 // If the conversion function doesn't return a reference type, 4547 // it can't be considered for this conversion. 4548 if (Conv->getConversionType()->isLValueReferenceType() && 4549 (AllowExplicit || !Conv->isExplicit())) { 4550 if (ConvTemplate) 4551 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4552 Init, DeclType, CandidateSet); 4553 else 4554 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4555 DeclType, CandidateSet); 4556 } 4557 } 4558 4559 OverloadCandidateSet::iterator Best; 4560 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4561 case OR_Success: 4562 // C++ [over.ics.ref]p1: 4563 // 4564 // [...] If the parameter binds directly to the result of 4565 // applying a conversion function to the argument 4566 // expression, the implicit conversion sequence is a 4567 // user-defined conversion sequence (13.3.3.1.2), with the 4568 // second standard conversion sequence either an identity 4569 // conversion or, if the conversion function returns an 4570 // entity of a type that is a derived class of the parameter 4571 // type, a derived-to-base Conversion. 4572 if (!Best->FinalConversion.DirectBinding) 4573 break; 4574 4575 // This is a direct binding. 4576 BindsDirectly = true; 4577 4578 if (ICS) { 4579 ICS->setUserDefined(); 4580 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4581 ICS->UserDefined.After = Best->FinalConversion; 4582 ICS->UserDefined.ConversionFunction = Best->Function; 4583 ICS->UserDefined.EllipsisConversion = false; 4584 assert(ICS->UserDefined.After.ReferenceBinding && 4585 ICS->UserDefined.After.DirectBinding && 4586 "Expected a direct reference binding!"); 4587 return false; 4588 } else { 4589 OwningExprResult InitConversion = 4590 BuildCXXCastArgument(DeclLoc, QualType(), 4591 CastExpr::CK_UserDefinedConversion, 4592 cast<CXXMethodDecl>(Best->Function), 4593 Owned(Init)); 4594 Init = InitConversion.takeAs<Expr>(); 4595 4596 if (CheckExceptionSpecCompatibility(Init, T1)) 4597 return true; 4598 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4599 /*isLvalue=*/true); 4600 } 4601 break; 4602 4603 case OR_Ambiguous: 4604 if (ICS) { 4605 ICS->setAmbiguous(); 4606 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4607 Cand != CandidateSet.end(); ++Cand) 4608 if (Cand->Viable) 4609 ICS->Ambiguous.addConversion(Cand->Function); 4610 break; 4611 } 4612 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4613 << Init->getSourceRange(); 4614 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4615 return true; 4616 4617 case OR_No_Viable_Function: 4618 case OR_Deleted: 4619 // There was no suitable conversion, or we found a deleted 4620 // conversion; continue with other checks. 4621 break; 4622 } 4623 } 4624 4625 if (BindsDirectly) { 4626 // C++ [dcl.init.ref]p4: 4627 // [...] In all cases where the reference-related or 4628 // reference-compatible relationship of two types is used to 4629 // establish the validity of a reference binding, and T1 is a 4630 // base class of T2, a program that necessitates such a binding 4631 // is ill-formed if T1 is an inaccessible (clause 11) or 4632 // ambiguous (10.2) base class of T2. 4633 // 4634 // Note that we only check this condition when we're allowed to 4635 // complain about errors, because we should not be checking for 4636 // ambiguity (or inaccessibility) unless the reference binding 4637 // actually happens. 4638 if (DerivedToBase) 4639 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4640 Init->getSourceRange(), 4641 IgnoreBaseAccess); 4642 else 4643 return false; 4644 } 4645 4646 // -- Otherwise, the reference shall be to a non-volatile const 4647 // type (i.e., cv1 shall be const), or the reference shall be an 4648 // rvalue reference and the initializer expression shall be an rvalue. 4649 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4650 if (!ICS) 4651 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4652 << T1.isVolatileQualified() 4653 << T1 << int(InitLvalue != Expr::LV_Valid) 4654 << T2 << Init->getSourceRange(); 4655 return true; 4656 } 4657 4658 // -- If the initializer expression is an rvalue, with T2 a 4659 // class type, and "cv1 T1" is reference-compatible with 4660 // "cv2 T2," the reference is bound in one of the 4661 // following ways (the choice is implementation-defined): 4662 // 4663 // -- The reference is bound to the object represented by 4664 // the rvalue (see 3.10) or to a sub-object within that 4665 // object. 4666 // 4667 // -- A temporary of type "cv1 T2" [sic] is created, and 4668 // a constructor is called to copy the entire rvalue 4669 // object into the temporary. The reference is bound to 4670 // the temporary or to a sub-object within the 4671 // temporary. 4672 // 4673 // The constructor that would be used to make the copy 4674 // shall be callable whether or not the copy is actually 4675 // done. 4676 // 4677 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4678 // freedom, so we will always take the first option and never build 4679 // a temporary in this case. FIXME: We will, however, have to check 4680 // for the presence of a copy constructor in C++98/03 mode. 4681 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4682 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4683 if (ICS) { 4684 ICS->setStandard(); 4685 ICS->Standard.First = ICK_Identity; 4686 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4687 ICS->Standard.Third = ICK_Identity; 4688 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4689 ICS->Standard.setToType(0, T2); 4690 ICS->Standard.setToType(1, T1); 4691 ICS->Standard.setToType(2, T1); 4692 ICS->Standard.ReferenceBinding = true; 4693 ICS->Standard.DirectBinding = false; 4694 ICS->Standard.RRefBinding = isRValRef; 4695 ICS->Standard.CopyConstructor = 0; 4696 } else { 4697 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4698 if (DerivedToBase) 4699 CK = CastExpr::CK_DerivedToBase; 4700 else if(CheckExceptionSpecCompatibility(Init, T1)) 4701 return true; 4702 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4703 } 4704 return false; 4705 } 4706 4707 // -- Otherwise, a temporary of type "cv1 T1" is created and 4708 // initialized from the initializer expression using the 4709 // rules for a non-reference copy initialization (8.5). The 4710 // reference is then bound to the temporary. If T1 is 4711 // reference-related to T2, cv1 must be the same 4712 // cv-qualification as, or greater cv-qualification than, 4713 // cv2; otherwise, the program is ill-formed. 4714 if (RefRelationship == Ref_Related) { 4715 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4716 // we would be reference-compatible or reference-compatible with 4717 // added qualification. But that wasn't the case, so the reference 4718 // initialization fails. 4719 if (!ICS) 4720 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4721 << T1 << int(InitLvalue != Expr::LV_Valid) 4722 << T2 << Init->getSourceRange(); 4723 return true; 4724 } 4725 4726 // If at least one of the types is a class type, the types are not 4727 // related, and we aren't allowed any user conversions, the 4728 // reference binding fails. This case is important for breaking 4729 // recursion, since TryImplicitConversion below will attempt to 4730 // create a temporary through the use of a copy constructor. 4731 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4732 (T1->isRecordType() || T2->isRecordType())) { 4733 if (!ICS) 4734 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4735 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4736 return true; 4737 } 4738 4739 // Actually try to convert the initializer to T1. 4740 if (ICS) { 4741 // C++ [over.ics.ref]p2: 4742 // 4743 // When a parameter of reference type is not bound directly to 4744 // an argument expression, the conversion sequence is the one 4745 // required to convert the argument expression to the 4746 // underlying type of the reference according to 4747 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4748 // to copy-initializing a temporary of the underlying type with 4749 // the argument expression. Any difference in top-level 4750 // cv-qualification is subsumed by the initialization itself 4751 // and does not constitute a conversion. 4752 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4753 /*AllowExplicit=*/false, 4754 /*ForceRValue=*/false, 4755 /*InOverloadResolution=*/false); 4756 4757 // Of course, that's still a reference binding. 4758 if (ICS->isStandard()) { 4759 ICS->Standard.ReferenceBinding = true; 4760 ICS->Standard.RRefBinding = isRValRef; 4761 } else if (ICS->isUserDefined()) { 4762 ICS->UserDefined.After.ReferenceBinding = true; 4763 ICS->UserDefined.After.RRefBinding = isRValRef; 4764 } 4765 return ICS->isBad(); 4766 } else { 4767 ImplicitConversionSequence Conversions; 4768 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4769 false, false, 4770 Conversions); 4771 if (badConversion) { 4772 if (Conversions.isAmbiguous()) { 4773 Diag(DeclLoc, 4774 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4775 for (int j = Conversions.Ambiguous.conversions().size()-1; 4776 j >= 0; j--) { 4777 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4778 NoteOverloadCandidate(Func); 4779 } 4780 } 4781 else { 4782 if (isRValRef) 4783 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4784 << Init->getSourceRange(); 4785 else 4786 Diag(DeclLoc, diag::err_invalid_initialization) 4787 << DeclType << Init->getType() << Init->getSourceRange(); 4788 } 4789 } 4790 return badConversion; 4791 } 4792} 4793 4794static inline bool 4795CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4796 const FunctionDecl *FnDecl) { 4797 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4798 if (isa<NamespaceDecl>(DC)) { 4799 return SemaRef.Diag(FnDecl->getLocation(), 4800 diag::err_operator_new_delete_declared_in_namespace) 4801 << FnDecl->getDeclName(); 4802 } 4803 4804 if (isa<TranslationUnitDecl>(DC) && 4805 FnDecl->getStorageClass() == FunctionDecl::Static) { 4806 return SemaRef.Diag(FnDecl->getLocation(), 4807 diag::err_operator_new_delete_declared_static) 4808 << FnDecl->getDeclName(); 4809 } 4810 4811 return false; 4812} 4813 4814static inline bool 4815CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4816 CanQualType ExpectedResultType, 4817 CanQualType ExpectedFirstParamType, 4818 unsigned DependentParamTypeDiag, 4819 unsigned InvalidParamTypeDiag) { 4820 QualType ResultType = 4821 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4822 4823 // Check that the result type is not dependent. 4824 if (ResultType->isDependentType()) 4825 return SemaRef.Diag(FnDecl->getLocation(), 4826 diag::err_operator_new_delete_dependent_result_type) 4827 << FnDecl->getDeclName() << ExpectedResultType; 4828 4829 // Check that the result type is what we expect. 4830 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4831 return SemaRef.Diag(FnDecl->getLocation(), 4832 diag::err_operator_new_delete_invalid_result_type) 4833 << FnDecl->getDeclName() << ExpectedResultType; 4834 4835 // A function template must have at least 2 parameters. 4836 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4837 return SemaRef.Diag(FnDecl->getLocation(), 4838 diag::err_operator_new_delete_template_too_few_parameters) 4839 << FnDecl->getDeclName(); 4840 4841 // The function decl must have at least 1 parameter. 4842 if (FnDecl->getNumParams() == 0) 4843 return SemaRef.Diag(FnDecl->getLocation(), 4844 diag::err_operator_new_delete_too_few_parameters) 4845 << FnDecl->getDeclName(); 4846 4847 // Check the the first parameter type is not dependent. 4848 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4849 if (FirstParamType->isDependentType()) 4850 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4851 << FnDecl->getDeclName() << ExpectedFirstParamType; 4852 4853 // Check that the first parameter type is what we expect. 4854 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4855 ExpectedFirstParamType) 4856 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4857 << FnDecl->getDeclName() << ExpectedFirstParamType; 4858 4859 return false; 4860} 4861 4862static bool 4863CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4864 // C++ [basic.stc.dynamic.allocation]p1: 4865 // A program is ill-formed if an allocation function is declared in a 4866 // namespace scope other than global scope or declared static in global 4867 // scope. 4868 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4869 return true; 4870 4871 CanQualType SizeTy = 4872 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4873 4874 // C++ [basic.stc.dynamic.allocation]p1: 4875 // The return type shall be void*. The first parameter shall have type 4876 // std::size_t. 4877 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4878 SizeTy, 4879 diag::err_operator_new_dependent_param_type, 4880 diag::err_operator_new_param_type)) 4881 return true; 4882 4883 // C++ [basic.stc.dynamic.allocation]p1: 4884 // The first parameter shall not have an associated default argument. 4885 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4886 return SemaRef.Diag(FnDecl->getLocation(), 4887 diag::err_operator_new_default_arg) 4888 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4889 4890 return false; 4891} 4892 4893static bool 4894CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4895 // C++ [basic.stc.dynamic.deallocation]p1: 4896 // A program is ill-formed if deallocation functions are declared in a 4897 // namespace scope other than global scope or declared static in global 4898 // scope. 4899 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4900 return true; 4901 4902 // C++ [basic.stc.dynamic.deallocation]p2: 4903 // Each deallocation function shall return void and its first parameter 4904 // shall be void*. 4905 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4906 SemaRef.Context.VoidPtrTy, 4907 diag::err_operator_delete_dependent_param_type, 4908 diag::err_operator_delete_param_type)) 4909 return true; 4910 4911 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4912 if (FirstParamType->isDependentType()) 4913 return SemaRef.Diag(FnDecl->getLocation(), 4914 diag::err_operator_delete_dependent_param_type) 4915 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4916 4917 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4918 SemaRef.Context.VoidPtrTy) 4919 return SemaRef.Diag(FnDecl->getLocation(), 4920 diag::err_operator_delete_param_type) 4921 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4922 4923 return false; 4924} 4925 4926/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4927/// of this overloaded operator is well-formed. If so, returns false; 4928/// otherwise, emits appropriate diagnostics and returns true. 4929bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4930 assert(FnDecl && FnDecl->isOverloadedOperator() && 4931 "Expected an overloaded operator declaration"); 4932 4933 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4934 4935 // C++ [over.oper]p5: 4936 // The allocation and deallocation functions, operator new, 4937 // operator new[], operator delete and operator delete[], are 4938 // described completely in 3.7.3. The attributes and restrictions 4939 // found in the rest of this subclause do not apply to them unless 4940 // explicitly stated in 3.7.3. 4941 if (Op == OO_Delete || Op == OO_Array_Delete) 4942 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4943 4944 if (Op == OO_New || Op == OO_Array_New) 4945 return CheckOperatorNewDeclaration(*this, FnDecl); 4946 4947 // C++ [over.oper]p6: 4948 // An operator function shall either be a non-static member 4949 // function or be a non-member function and have at least one 4950 // parameter whose type is a class, a reference to a class, an 4951 // enumeration, or a reference to an enumeration. 4952 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4953 if (MethodDecl->isStatic()) 4954 return Diag(FnDecl->getLocation(), 4955 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4956 } else { 4957 bool ClassOrEnumParam = false; 4958 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4959 ParamEnd = FnDecl->param_end(); 4960 Param != ParamEnd; ++Param) { 4961 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4962 if (ParamType->isDependentType() || ParamType->isRecordType() || 4963 ParamType->isEnumeralType()) { 4964 ClassOrEnumParam = true; 4965 break; 4966 } 4967 } 4968 4969 if (!ClassOrEnumParam) 4970 return Diag(FnDecl->getLocation(), 4971 diag::err_operator_overload_needs_class_or_enum) 4972 << FnDecl->getDeclName(); 4973 } 4974 4975 // C++ [over.oper]p8: 4976 // An operator function cannot have default arguments (8.3.6), 4977 // except where explicitly stated below. 4978 // 4979 // Only the function-call operator allows default arguments 4980 // (C++ [over.call]p1). 4981 if (Op != OO_Call) { 4982 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4983 Param != FnDecl->param_end(); ++Param) { 4984 if ((*Param)->hasDefaultArg()) 4985 return Diag((*Param)->getLocation(), 4986 diag::err_operator_overload_default_arg) 4987 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4988 } 4989 } 4990 4991 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4992 { false, false, false } 4993#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4994 , { Unary, Binary, MemberOnly } 4995#include "clang/Basic/OperatorKinds.def" 4996 }; 4997 4998 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4999 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5000 bool MustBeMemberOperator = OperatorUses[Op][2]; 5001 5002 // C++ [over.oper]p8: 5003 // [...] Operator functions cannot have more or fewer parameters 5004 // than the number required for the corresponding operator, as 5005 // described in the rest of this subclause. 5006 unsigned NumParams = FnDecl->getNumParams() 5007 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5008 if (Op != OO_Call && 5009 ((NumParams == 1 && !CanBeUnaryOperator) || 5010 (NumParams == 2 && !CanBeBinaryOperator) || 5011 (NumParams < 1) || (NumParams > 2))) { 5012 // We have the wrong number of parameters. 5013 unsigned ErrorKind; 5014 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5015 ErrorKind = 2; // 2 -> unary or binary. 5016 } else if (CanBeUnaryOperator) { 5017 ErrorKind = 0; // 0 -> unary 5018 } else { 5019 assert(CanBeBinaryOperator && 5020 "All non-call overloaded operators are unary or binary!"); 5021 ErrorKind = 1; // 1 -> binary 5022 } 5023 5024 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5025 << FnDecl->getDeclName() << NumParams << ErrorKind; 5026 } 5027 5028 // Overloaded operators other than operator() cannot be variadic. 5029 if (Op != OO_Call && 5030 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5031 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5032 << FnDecl->getDeclName(); 5033 } 5034 5035 // Some operators must be non-static member functions. 5036 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5037 return Diag(FnDecl->getLocation(), 5038 diag::err_operator_overload_must_be_member) 5039 << FnDecl->getDeclName(); 5040 } 5041 5042 // C++ [over.inc]p1: 5043 // The user-defined function called operator++ implements the 5044 // prefix and postfix ++ operator. If this function is a member 5045 // function with no parameters, or a non-member function with one 5046 // parameter of class or enumeration type, it defines the prefix 5047 // increment operator ++ for objects of that type. If the function 5048 // is a member function with one parameter (which shall be of type 5049 // int) or a non-member function with two parameters (the second 5050 // of which shall be of type int), it defines the postfix 5051 // increment operator ++ for objects of that type. 5052 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5053 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5054 bool ParamIsInt = false; 5055 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5056 ParamIsInt = BT->getKind() == BuiltinType::Int; 5057 5058 if (!ParamIsInt) 5059 return Diag(LastParam->getLocation(), 5060 diag::err_operator_overload_post_incdec_must_be_int) 5061 << LastParam->getType() << (Op == OO_MinusMinus); 5062 } 5063 5064 // Notify the class if it got an assignment operator. 5065 if (Op == OO_Equal) { 5066 // Would have returned earlier otherwise. 5067 assert(isa<CXXMethodDecl>(FnDecl) && 5068 "Overloaded = not member, but not filtered."); 5069 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5070 Method->getParent()->addedAssignmentOperator(Context, Method); 5071 } 5072 5073 return false; 5074} 5075 5076/// CheckLiteralOperatorDeclaration - Check whether the declaration 5077/// of this literal operator function is well-formed. If so, returns 5078/// false; otherwise, emits appropriate diagnostics and returns true. 5079bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5080 DeclContext *DC = FnDecl->getDeclContext(); 5081 Decl::Kind Kind = DC->getDeclKind(); 5082 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5083 Kind != Decl::LinkageSpec) { 5084 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5085 << FnDecl->getDeclName(); 5086 return true; 5087 } 5088 5089 bool Valid = false; 5090 5091 // FIXME: Check for the one valid template signature 5092 // template <char...> type operator "" name(); 5093 5094 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5095 // Check the first parameter 5096 QualType T = (*Param)->getType(); 5097 5098 // unsigned long long int and long double are allowed, but only 5099 // alone. 5100 // We also allow any character type; their omission seems to be a bug 5101 // in n3000 5102 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5103 Context.hasSameType(T, Context.LongDoubleTy) || 5104 Context.hasSameType(T, Context.CharTy) || 5105 Context.hasSameType(T, Context.WCharTy) || 5106 Context.hasSameType(T, Context.Char16Ty) || 5107 Context.hasSameType(T, Context.Char32Ty)) { 5108 if (++Param == FnDecl->param_end()) 5109 Valid = true; 5110 goto FinishedParams; 5111 } 5112 5113 // Otherwise it must be a pointer to const; let's strip those. 5114 const PointerType *PT = T->getAs<PointerType>(); 5115 if (!PT) 5116 goto FinishedParams; 5117 T = PT->getPointeeType(); 5118 if (!T.isConstQualified()) 5119 goto FinishedParams; 5120 T = T.getUnqualifiedType(); 5121 5122 // Move on to the second parameter; 5123 ++Param; 5124 5125 // If there is no second parameter, the first must be a const char * 5126 if (Param == FnDecl->param_end()) { 5127 if (Context.hasSameType(T, Context.CharTy)) 5128 Valid = true; 5129 goto FinishedParams; 5130 } 5131 5132 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5133 // are allowed as the first parameter to a two-parameter function 5134 if (!(Context.hasSameType(T, Context.CharTy) || 5135 Context.hasSameType(T, Context.WCharTy) || 5136 Context.hasSameType(T, Context.Char16Ty) || 5137 Context.hasSameType(T, Context.Char32Ty))) 5138 goto FinishedParams; 5139 5140 // The second and final parameter must be an std::size_t 5141 T = (*Param)->getType().getUnqualifiedType(); 5142 if (Context.hasSameType(T, Context.getSizeType()) && 5143 ++Param == FnDecl->param_end()) 5144 Valid = true; 5145 } 5146 5147 // FIXME: This diagnostic is absolutely terrible. 5148FinishedParams: 5149 if (!Valid) { 5150 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5151 << FnDecl->getDeclName(); 5152 return true; 5153 } 5154 5155 return false; 5156} 5157 5158/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5159/// linkage specification, including the language and (if present) 5160/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5161/// the location of the language string literal, which is provided 5162/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5163/// the '{' brace. Otherwise, this linkage specification does not 5164/// have any braces. 5165Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5166 SourceLocation ExternLoc, 5167 SourceLocation LangLoc, 5168 const char *Lang, 5169 unsigned StrSize, 5170 SourceLocation LBraceLoc) { 5171 LinkageSpecDecl::LanguageIDs Language; 5172 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5173 Language = LinkageSpecDecl::lang_c; 5174 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5175 Language = LinkageSpecDecl::lang_cxx; 5176 else { 5177 Diag(LangLoc, diag::err_bad_language); 5178 return DeclPtrTy(); 5179 } 5180 5181 // FIXME: Add all the various semantics of linkage specifications 5182 5183 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5184 LangLoc, Language, 5185 LBraceLoc.isValid()); 5186 CurContext->addDecl(D); 5187 PushDeclContext(S, D); 5188 return DeclPtrTy::make(D); 5189} 5190 5191/// ActOnFinishLinkageSpecification - Completely the definition of 5192/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5193/// valid, it's the position of the closing '}' brace in a linkage 5194/// specification that uses braces. 5195Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5196 DeclPtrTy LinkageSpec, 5197 SourceLocation RBraceLoc) { 5198 if (LinkageSpec) 5199 PopDeclContext(); 5200 return LinkageSpec; 5201} 5202 5203/// \brief Perform semantic analysis for the variable declaration that 5204/// occurs within a C++ catch clause, returning the newly-created 5205/// variable. 5206VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5207 TypeSourceInfo *TInfo, 5208 IdentifierInfo *Name, 5209 SourceLocation Loc, 5210 SourceRange Range) { 5211 bool Invalid = false; 5212 5213 // Arrays and functions decay. 5214 if (ExDeclType->isArrayType()) 5215 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5216 else if (ExDeclType->isFunctionType()) 5217 ExDeclType = Context.getPointerType(ExDeclType); 5218 5219 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5220 // The exception-declaration shall not denote a pointer or reference to an 5221 // incomplete type, other than [cv] void*. 5222 // N2844 forbids rvalue references. 5223 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5224 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5225 Invalid = true; 5226 } 5227 5228 // GCC allows catching pointers and references to incomplete types 5229 // as an extension; so do we, but we warn by default. 5230 5231 QualType BaseType = ExDeclType; 5232 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5233 unsigned DK = diag::err_catch_incomplete; 5234 bool IncompleteCatchIsInvalid = true; 5235 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5236 BaseType = Ptr->getPointeeType(); 5237 Mode = 1; 5238 DK = diag::ext_catch_incomplete_ptr; 5239 IncompleteCatchIsInvalid = false; 5240 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5241 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5242 BaseType = Ref->getPointeeType(); 5243 Mode = 2; 5244 DK = diag::ext_catch_incomplete_ref; 5245 IncompleteCatchIsInvalid = false; 5246 } 5247 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5248 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5249 IncompleteCatchIsInvalid) 5250 Invalid = true; 5251 5252 if (!Invalid && !ExDeclType->isDependentType() && 5253 RequireNonAbstractType(Loc, ExDeclType, 5254 diag::err_abstract_type_in_decl, 5255 AbstractVariableType)) 5256 Invalid = true; 5257 5258 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5259 Name, ExDeclType, TInfo, VarDecl::None); 5260 5261 if (!Invalid) { 5262 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5263 // C++ [except.handle]p16: 5264 // The object declared in an exception-declaration or, if the 5265 // exception-declaration does not specify a name, a temporary (12.2) is 5266 // copy-initialized (8.5) from the exception object. [...] 5267 // The object is destroyed when the handler exits, after the destruction 5268 // of any automatic objects initialized within the handler. 5269 // 5270 // We just pretend to initialize the object with itself, then make sure 5271 // it can be destroyed later. 5272 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5273 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5274 Loc, ExDeclType, 0); 5275 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5276 SourceLocation()); 5277 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5278 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5279 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5280 if (Result.isInvalid()) 5281 Invalid = true; 5282 else 5283 FinalizeVarWithDestructor(ExDecl, RecordTy); 5284 } 5285 } 5286 5287 if (Invalid) 5288 ExDecl->setInvalidDecl(); 5289 5290 return ExDecl; 5291} 5292 5293/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5294/// handler. 5295Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5296 TypeSourceInfo *TInfo = 0; 5297 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5298 5299 bool Invalid = D.isInvalidType(); 5300 IdentifierInfo *II = D.getIdentifier(); 5301 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5302 // The scope should be freshly made just for us. There is just no way 5303 // it contains any previous declaration. 5304 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5305 if (PrevDecl->isTemplateParameter()) { 5306 // Maybe we will complain about the shadowed template parameter. 5307 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5308 } 5309 } 5310 5311 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5312 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5313 << D.getCXXScopeSpec().getRange(); 5314 Invalid = true; 5315 } 5316 5317 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5318 D.getIdentifier(), 5319 D.getIdentifierLoc(), 5320 D.getDeclSpec().getSourceRange()); 5321 5322 if (Invalid) 5323 ExDecl->setInvalidDecl(); 5324 5325 // Add the exception declaration into this scope. 5326 if (II) 5327 PushOnScopeChains(ExDecl, S); 5328 else 5329 CurContext->addDecl(ExDecl); 5330 5331 ProcessDeclAttributes(S, ExDecl, D); 5332 return DeclPtrTy::make(ExDecl); 5333} 5334 5335Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5336 ExprArg assertexpr, 5337 ExprArg assertmessageexpr) { 5338 Expr *AssertExpr = (Expr *)assertexpr.get(); 5339 StringLiteral *AssertMessage = 5340 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5341 5342 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5343 llvm::APSInt Value(32); 5344 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5345 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5346 AssertExpr->getSourceRange(); 5347 return DeclPtrTy(); 5348 } 5349 5350 if (Value == 0) { 5351 Diag(AssertLoc, diag::err_static_assert_failed) 5352 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5353 } 5354 } 5355 5356 assertexpr.release(); 5357 assertmessageexpr.release(); 5358 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5359 AssertExpr, AssertMessage); 5360 5361 CurContext->addDecl(Decl); 5362 return DeclPtrTy::make(Decl); 5363} 5364 5365/// Handle a friend type declaration. This works in tandem with 5366/// ActOnTag. 5367/// 5368/// Notes on friend class templates: 5369/// 5370/// We generally treat friend class declarations as if they were 5371/// declaring a class. So, for example, the elaborated type specifier 5372/// in a friend declaration is required to obey the restrictions of a 5373/// class-head (i.e. no typedefs in the scope chain), template 5374/// parameters are required to match up with simple template-ids, &c. 5375/// However, unlike when declaring a template specialization, it's 5376/// okay to refer to a template specialization without an empty 5377/// template parameter declaration, e.g. 5378/// friend class A<T>::B<unsigned>; 5379/// We permit this as a special case; if there are any template 5380/// parameters present at all, require proper matching, i.e. 5381/// template <> template <class T> friend class A<int>::B; 5382Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5383 MultiTemplateParamsArg TempParams) { 5384 SourceLocation Loc = DS.getSourceRange().getBegin(); 5385 5386 assert(DS.isFriendSpecified()); 5387 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5388 5389 // Try to convert the decl specifier to a type. This works for 5390 // friend templates because ActOnTag never produces a ClassTemplateDecl 5391 // for a TUK_Friend. 5392 Declarator TheDeclarator(DS, Declarator::MemberContext); 5393 TypeSourceInfo *TSI; 5394 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5395 if (TheDeclarator.isInvalidType()) 5396 return DeclPtrTy(); 5397 5398 // This is definitely an error in C++98. It's probably meant to 5399 // be forbidden in C++0x, too, but the specification is just 5400 // poorly written. 5401 // 5402 // The problem is with declarations like the following: 5403 // template <T> friend A<T>::foo; 5404 // where deciding whether a class C is a friend or not now hinges 5405 // on whether there exists an instantiation of A that causes 5406 // 'foo' to equal C. There are restrictions on class-heads 5407 // (which we declare (by fiat) elaborated friend declarations to 5408 // be) that makes this tractable. 5409 // 5410 // FIXME: handle "template <> friend class A<T>;", which 5411 // is possibly well-formed? Who even knows? 5412 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5413 Diag(Loc, diag::err_tagless_friend_type_template) 5414 << DS.getSourceRange(); 5415 return DeclPtrTy(); 5416 } 5417 5418 // C++ [class.friend]p2: 5419 // An elaborated-type-specifier shall be used in a friend declaration 5420 // for a class.* 5421 // * The class-key of the elaborated-type-specifier is required. 5422 // This is one of the rare places in Clang where it's legitimate to 5423 // ask about the "spelling" of the type. 5424 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5425 // If we evaluated the type to a record type, suggest putting 5426 // a tag in front. 5427 if (const RecordType *RT = T->getAs<RecordType>()) { 5428 RecordDecl *RD = RT->getDecl(); 5429 5430 std::string InsertionText = std::string(" ") + RD->getKindName(); 5431 5432 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5433 << (unsigned) RD->getTagKind() 5434 << T 5435 << SourceRange(DS.getFriendSpecLoc()) 5436 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5437 InsertionText); 5438 return DeclPtrTy(); 5439 }else { 5440 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5441 << DS.getSourceRange(); 5442 return DeclPtrTy(); 5443 } 5444 } 5445 5446 // Enum types cannot be friends. 5447 if (T->getAs<EnumType>()) { 5448 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5449 << SourceRange(DS.getFriendSpecLoc()); 5450 return DeclPtrTy(); 5451 } 5452 5453 // C++98 [class.friend]p1: A friend of a class is a function 5454 // or class that is not a member of the class . . . 5455 // This is fixed in DR77, which just barely didn't make the C++03 5456 // deadline. It's also a very silly restriction that seriously 5457 // affects inner classes and which nobody else seems to implement; 5458 // thus we never diagnose it, not even in -pedantic. 5459 // 5460 // But note that we could warn about it: it's always useless to 5461 // friend one of your own members (it's not, however, worthless to 5462 // friend a member of an arbitrary specialization of your template). 5463 5464 Decl *D; 5465 if (TempParams.size()) 5466 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5467 TempParams.size(), 5468 (TemplateParameterList**) TempParams.release(), 5469 TSI, 5470 DS.getFriendSpecLoc()); 5471 else 5472 D = FriendDecl::Create(Context, CurContext, Loc, TSI, 5473 DS.getFriendSpecLoc()); 5474 D->setAccess(AS_public); 5475 CurContext->addDecl(D); 5476 5477 return DeclPtrTy::make(D); 5478} 5479 5480Sema::DeclPtrTy 5481Sema::ActOnFriendFunctionDecl(Scope *S, 5482 Declarator &D, 5483 bool IsDefinition, 5484 MultiTemplateParamsArg TemplateParams) { 5485 const DeclSpec &DS = D.getDeclSpec(); 5486 5487 assert(DS.isFriendSpecified()); 5488 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5489 5490 SourceLocation Loc = D.getIdentifierLoc(); 5491 TypeSourceInfo *TInfo = 0; 5492 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5493 5494 // C++ [class.friend]p1 5495 // A friend of a class is a function or class.... 5496 // Note that this sees through typedefs, which is intended. 5497 // It *doesn't* see through dependent types, which is correct 5498 // according to [temp.arg.type]p3: 5499 // If a declaration acquires a function type through a 5500 // type dependent on a template-parameter and this causes 5501 // a declaration that does not use the syntactic form of a 5502 // function declarator to have a function type, the program 5503 // is ill-formed. 5504 if (!T->isFunctionType()) { 5505 Diag(Loc, diag::err_unexpected_friend); 5506 5507 // It might be worthwhile to try to recover by creating an 5508 // appropriate declaration. 5509 return DeclPtrTy(); 5510 } 5511 5512 // C++ [namespace.memdef]p3 5513 // - If a friend declaration in a non-local class first declares a 5514 // class or function, the friend class or function is a member 5515 // of the innermost enclosing namespace. 5516 // - The name of the friend is not found by simple name lookup 5517 // until a matching declaration is provided in that namespace 5518 // scope (either before or after the class declaration granting 5519 // friendship). 5520 // - If a friend function is called, its name may be found by the 5521 // name lookup that considers functions from namespaces and 5522 // classes associated with the types of the function arguments. 5523 // - When looking for a prior declaration of a class or a function 5524 // declared as a friend, scopes outside the innermost enclosing 5525 // namespace scope are not considered. 5526 5527 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5528 DeclarationName Name = GetNameForDeclarator(D); 5529 assert(Name); 5530 5531 // The context we found the declaration in, or in which we should 5532 // create the declaration. 5533 DeclContext *DC; 5534 5535 // FIXME: handle local classes 5536 5537 // Recover from invalid scope qualifiers as if they just weren't there. 5538 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5539 ForRedeclaration); 5540 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5541 // FIXME: RequireCompleteDeclContext 5542 DC = computeDeclContext(ScopeQual); 5543 5544 // FIXME: handle dependent contexts 5545 if (!DC) return DeclPtrTy(); 5546 5547 LookupQualifiedName(Previous, DC); 5548 5549 // If searching in that context implicitly found a declaration in 5550 // a different context, treat it like it wasn't found at all. 5551 // TODO: better diagnostics for this case. Suggesting the right 5552 // qualified scope would be nice... 5553 // FIXME: getRepresentativeDecl() is not right here at all 5554 if (Previous.empty() || 5555 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5556 D.setInvalidType(); 5557 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5558 return DeclPtrTy(); 5559 } 5560 5561 // C++ [class.friend]p1: A friend of a class is a function or 5562 // class that is not a member of the class . . . 5563 if (DC->Equals(CurContext)) 5564 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5565 5566 // Otherwise walk out to the nearest namespace scope looking for matches. 5567 } else { 5568 // TODO: handle local class contexts. 5569 5570 DC = CurContext; 5571 while (true) { 5572 // Skip class contexts. If someone can cite chapter and verse 5573 // for this behavior, that would be nice --- it's what GCC and 5574 // EDG do, and it seems like a reasonable intent, but the spec 5575 // really only says that checks for unqualified existing 5576 // declarations should stop at the nearest enclosing namespace, 5577 // not that they should only consider the nearest enclosing 5578 // namespace. 5579 while (DC->isRecord()) 5580 DC = DC->getParent(); 5581 5582 LookupQualifiedName(Previous, DC); 5583 5584 // TODO: decide what we think about using declarations. 5585 if (!Previous.empty()) 5586 break; 5587 5588 if (DC->isFileContext()) break; 5589 DC = DC->getParent(); 5590 } 5591 5592 // C++ [class.friend]p1: A friend of a class is a function or 5593 // class that is not a member of the class . . . 5594 // C++0x changes this for both friend types and functions. 5595 // Most C++ 98 compilers do seem to give an error here, so 5596 // we do, too. 5597 if (!Previous.empty() && DC->Equals(CurContext) 5598 && !getLangOptions().CPlusPlus0x) 5599 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5600 } 5601 5602 if (DC->isFileContext()) { 5603 // This implies that it has to be an operator or function. 5604 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5605 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5606 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5607 Diag(Loc, diag::err_introducing_special_friend) << 5608 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5609 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5610 return DeclPtrTy(); 5611 } 5612 } 5613 5614 bool Redeclaration = false; 5615 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5616 move(TemplateParams), 5617 IsDefinition, 5618 Redeclaration); 5619 if (!ND) return DeclPtrTy(); 5620 5621 assert(ND->getDeclContext() == DC); 5622 assert(ND->getLexicalDeclContext() == CurContext); 5623 5624 // Add the function declaration to the appropriate lookup tables, 5625 // adjusting the redeclarations list as necessary. We don't 5626 // want to do this yet if the friending class is dependent. 5627 // 5628 // Also update the scope-based lookup if the target context's 5629 // lookup context is in lexical scope. 5630 if (!CurContext->isDependentContext()) { 5631 DC = DC->getLookupContext(); 5632 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5633 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5634 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5635 } 5636 5637 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5638 D.getIdentifierLoc(), ND, 5639 DS.getFriendSpecLoc()); 5640 FrD->setAccess(AS_public); 5641 CurContext->addDecl(FrD); 5642 5643 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5644 FrD->setSpecialization(true); 5645 5646 return DeclPtrTy::make(ND); 5647} 5648 5649void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5650 AdjustDeclIfTemplate(dcl); 5651 5652 Decl *Dcl = dcl.getAs<Decl>(); 5653 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5654 if (!Fn) { 5655 Diag(DelLoc, diag::err_deleted_non_function); 5656 return; 5657 } 5658 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5659 Diag(DelLoc, diag::err_deleted_decl_not_first); 5660 Diag(Prev->getLocation(), diag::note_previous_declaration); 5661 // If the declaration wasn't the first, we delete the function anyway for 5662 // recovery. 5663 } 5664 Fn->setDeleted(); 5665} 5666 5667static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5668 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5669 ++CI) { 5670 Stmt *SubStmt = *CI; 5671 if (!SubStmt) 5672 continue; 5673 if (isa<ReturnStmt>(SubStmt)) 5674 Self.Diag(SubStmt->getSourceRange().getBegin(), 5675 diag::err_return_in_constructor_handler); 5676 if (!isa<Expr>(SubStmt)) 5677 SearchForReturnInStmt(Self, SubStmt); 5678 } 5679} 5680 5681void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5682 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5683 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5684 SearchForReturnInStmt(*this, Handler); 5685 } 5686} 5687 5688bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5689 const CXXMethodDecl *Old) { 5690 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5691 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5692 5693 if (Context.hasSameType(NewTy, OldTy) || 5694 NewTy->isDependentType() || OldTy->isDependentType()) 5695 return false; 5696 5697 // Check if the return types are covariant 5698 QualType NewClassTy, OldClassTy; 5699 5700 /// Both types must be pointers or references to classes. 5701 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5702 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5703 NewClassTy = NewPT->getPointeeType(); 5704 OldClassTy = OldPT->getPointeeType(); 5705 } 5706 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5707 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5708 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5709 NewClassTy = NewRT->getPointeeType(); 5710 OldClassTy = OldRT->getPointeeType(); 5711 } 5712 } 5713 } 5714 5715 // The return types aren't either both pointers or references to a class type. 5716 if (NewClassTy.isNull()) { 5717 Diag(New->getLocation(), 5718 diag::err_different_return_type_for_overriding_virtual_function) 5719 << New->getDeclName() << NewTy << OldTy; 5720 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5721 5722 return true; 5723 } 5724 5725 // C++ [class.virtual]p6: 5726 // If the return type of D::f differs from the return type of B::f, the 5727 // class type in the return type of D::f shall be complete at the point of 5728 // declaration of D::f or shall be the class type D. 5729 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5730 if (!RT->isBeingDefined() && 5731 RequireCompleteType(New->getLocation(), NewClassTy, 5732 PDiag(diag::err_covariant_return_incomplete) 5733 << New->getDeclName())) 5734 return true; 5735 } 5736 5737 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5738 // Check if the new class derives from the old class. 5739 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5740 Diag(New->getLocation(), 5741 diag::err_covariant_return_not_derived) 5742 << New->getDeclName() << NewTy << OldTy; 5743 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5744 return true; 5745 } 5746 5747 // Check if we the conversion from derived to base is valid. 5748 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5749 diag::err_covariant_return_inaccessible_base, 5750 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5751 // FIXME: Should this point to the return type? 5752 New->getLocation(), SourceRange(), New->getDeclName())) { 5753 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5754 return true; 5755 } 5756 } 5757 5758 // The qualifiers of the return types must be the same. 5759 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5760 Diag(New->getLocation(), 5761 diag::err_covariant_return_type_different_qualifications) 5762 << New->getDeclName() << NewTy << OldTy; 5763 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5764 return true; 5765 }; 5766 5767 5768 // The new class type must have the same or less qualifiers as the old type. 5769 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5770 Diag(New->getLocation(), 5771 diag::err_covariant_return_type_class_type_more_qualified) 5772 << New->getDeclName() << NewTy << OldTy; 5773 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5774 return true; 5775 }; 5776 5777 return false; 5778} 5779 5780bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5781 const CXXMethodDecl *Old) 5782{ 5783 if (Old->hasAttr<FinalAttr>()) { 5784 Diag(New->getLocation(), diag::err_final_function_overridden) 5785 << New->getDeclName(); 5786 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5787 return true; 5788 } 5789 5790 return false; 5791} 5792 5793/// \brief Mark the given method pure. 5794/// 5795/// \param Method the method to be marked pure. 5796/// 5797/// \param InitRange the source range that covers the "0" initializer. 5798bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5799 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5800 Method->setPure(); 5801 5802 // A class is abstract if at least one function is pure virtual. 5803 Method->getParent()->setAbstract(true); 5804 return false; 5805 } 5806 5807 if (!Method->isInvalidDecl()) 5808 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5809 << Method->getDeclName() << InitRange; 5810 return true; 5811} 5812 5813/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5814/// an initializer for the out-of-line declaration 'Dcl'. The scope 5815/// is a fresh scope pushed for just this purpose. 5816/// 5817/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5818/// static data member of class X, names should be looked up in the scope of 5819/// class X. 5820void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5821 // If there is no declaration, there was an error parsing it. 5822 Decl *D = Dcl.getAs<Decl>(); 5823 if (D == 0) return; 5824 5825 // We should only get called for declarations with scope specifiers, like: 5826 // int foo::bar; 5827 assert(D->isOutOfLine()); 5828 EnterDeclaratorContext(S, D->getDeclContext()); 5829} 5830 5831/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5832/// initializer for the out-of-line declaration 'Dcl'. 5833void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5834 // If there is no declaration, there was an error parsing it. 5835 Decl *D = Dcl.getAs<Decl>(); 5836 if (D == 0) return; 5837 5838 assert(D->isOutOfLine()); 5839 ExitDeclaratorContext(S); 5840} 5841 5842/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5843/// C++ if/switch/while/for statement. 5844/// e.g: "if (int x = f()) {...}" 5845Action::DeclResult 5846Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5847 // C++ 6.4p2: 5848 // The declarator shall not specify a function or an array. 5849 // The type-specifier-seq shall not contain typedef and shall not declare a 5850 // new class or enumeration. 5851 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5852 "Parser allowed 'typedef' as storage class of condition decl."); 5853 5854 TypeSourceInfo *TInfo = 0; 5855 TagDecl *OwnedTag = 0; 5856 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5857 5858 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5859 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5860 // would be created and CXXConditionDeclExpr wants a VarDecl. 5861 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5862 << D.getSourceRange(); 5863 return DeclResult(); 5864 } else if (OwnedTag && OwnedTag->isDefinition()) { 5865 // The type-specifier-seq shall not declare a new class or enumeration. 5866 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5867 } 5868 5869 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5870 if (!Dcl) 5871 return DeclResult(); 5872 5873 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5874 VD->setDeclaredInCondition(true); 5875 return Dcl; 5876} 5877 5878static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5879 // Ignore dependent types. 5880 if (MD->isDependentContext()) 5881 return false; 5882 5883 // Ignore declarations that are not definitions. 5884 if (!MD->isThisDeclarationADefinition()) 5885 return false; 5886 5887 CXXRecordDecl *RD = MD->getParent(); 5888 5889 // Ignore classes without a vtable. 5890 if (!RD->isDynamicClass()) 5891 return false; 5892 5893 switch (MD->getParent()->getTemplateSpecializationKind()) { 5894 case TSK_Undeclared: 5895 case TSK_ExplicitSpecialization: 5896 // Classes that aren't instantiations of templates don't need their 5897 // virtual methods marked until we see the definition of the key 5898 // function. 5899 break; 5900 5901 case TSK_ImplicitInstantiation: 5902 // This is a constructor of a class template; mark all of the virtual 5903 // members as referenced to ensure that they get instantiatied. 5904 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5905 return true; 5906 break; 5907 5908 case TSK_ExplicitInstantiationDeclaration: 5909 return false; 5910 5911 case TSK_ExplicitInstantiationDefinition: 5912 // This is method of a explicit instantiation; mark all of the virtual 5913 // members as referenced to ensure that they get instantiatied. 5914 return true; 5915 } 5916 5917 // Consider only out-of-line definitions of member functions. When we see 5918 // an inline definition, it's too early to compute the key function. 5919 if (!MD->isOutOfLine()) 5920 return false; 5921 5922 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5923 5924 // If there is no key function, we will need a copy of the vtable. 5925 if (!KeyFunction) 5926 return true; 5927 5928 // If this is the key function, we need to mark virtual members. 5929 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5930 return true; 5931 5932 return false; 5933} 5934 5935void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5936 CXXMethodDecl *MD) { 5937 CXXRecordDecl *RD = MD->getParent(); 5938 5939 // We will need to mark all of the virtual members as referenced to build the 5940 // vtable. 5941 if (!needsVtable(MD, Context)) 5942 return; 5943 5944 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5945 if (kind == TSK_ImplicitInstantiation) 5946 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5947 else 5948 MarkVirtualMembersReferenced(Loc, RD); 5949} 5950 5951bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5952 if (ClassesWithUnmarkedVirtualMembers.empty()) 5953 return false; 5954 5955 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5956 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5957 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5958 ClassesWithUnmarkedVirtualMembers.pop_back(); 5959 MarkVirtualMembersReferenced(Loc, RD); 5960 } 5961 5962 return true; 5963} 5964 5965void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5966 const CXXRecordDecl *RD) { 5967 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5968 e = RD->method_end(); i != e; ++i) { 5969 CXXMethodDecl *MD = *i; 5970 5971 // C++ [basic.def.odr]p2: 5972 // [...] A virtual member function is used if it is not pure. [...] 5973 if (MD->isVirtual() && !MD->isPure()) 5974 MarkDeclarationReferenced(Loc, MD); 5975 } 5976 5977 // Only classes that have virtual bases need a VTT. 5978 if (RD->getNumVBases() == 0) 5979 return; 5980 5981 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5982 e = RD->bases_end(); i != e; ++i) { 5983 const CXXRecordDecl *Base = 5984 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5985 if (i->isVirtual()) 5986 continue; 5987 if (Base->getNumVBases() == 0) 5988 continue; 5989 MarkVirtualMembersReferenced(Loc, Base); 5990 } 5991} 5992