SemaDeclCXX.cpp revision c3fc84de310ca8f412abda63234f04825fa0124c
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 << FixItHint::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 << FixItHint::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 assert((Constructor->isImplicit() == IsImplicitConstructor)); 1435 1436 // We need to build the initializer AST according to order of construction 1437 // and not what user specified in the Initializers list. 1438 CXXRecordDecl *ClassDecl 1439 = cast<CXXRecordDecl>(Constructor->getDeclContext())->getDefinition(); 1440 if (!ClassDecl) 1441 return true; 1442 1443 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1444 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1445 bool HasDependentBaseInit = false; 1446 bool HadError = false; 1447 1448 for (unsigned i = 0; i < NumInitializers; i++) { 1449 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1450 if (Member->isBaseInitializer()) { 1451 if (Member->getBaseClass()->isDependentType()) 1452 HasDependentBaseInit = true; 1453 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1454 } else { 1455 AllBaseFields[Member->getMember()] = Member; 1456 } 1457 } 1458 1459 if (HasDependentBaseInit) { 1460 // FIXME. This does not preserve the ordering of the initializers. 1461 // Try (with -Wreorder) 1462 // template<class X> struct A {}; 1463 // template<class X> struct B : A<X> { 1464 // B() : x1(10), A<X>() {} 1465 // int x1; 1466 // }; 1467 // B<int> x; 1468 // On seeing one dependent type, we should essentially exit this routine 1469 // while preserving user-declared initializer list. When this routine is 1470 // called during instantiatiation process, this routine will rebuild the 1471 // ordered initializer list correctly. 1472 1473 // If we have a dependent base initialization, we can't determine the 1474 // association between initializers and bases; just dump the known 1475 // initializers into the list, and don't try to deal with other bases. 1476 for (unsigned i = 0; i < NumInitializers; i++) { 1477 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1478 if (Member->isBaseInitializer()) 1479 AllToInit.push_back(Member); 1480 } 1481 } else { 1482 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1483 1484 // Push virtual bases before others. 1485 for (CXXRecordDecl::base_class_iterator VBase = 1486 ClassDecl->vbases_begin(), 1487 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1488 if (VBase->getType()->isDependentType()) 1489 continue; 1490 if (CXXBaseOrMemberInitializer *Value 1491 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1492 AllToInit.push_back(Value); 1493 } else if (!AnyErrors) { 1494 InitializedEntity InitEntity 1495 = InitializedEntity::InitializeBase(Context, VBase); 1496 InitializationKind InitKind 1497 = InitializationKind::CreateDefault(Constructor->getLocation()); 1498 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1499 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1500 MultiExprArg(*this, 0, 0)); 1501 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1502 if (BaseInit.isInvalid()) { 1503 HadError = true; 1504 continue; 1505 } 1506 1507 // Don't attach synthesized base initializers in a dependent 1508 // context; they'll be checked again at template instantiation 1509 // time. 1510 if (CurContext->isDependentContext()) 1511 continue; 1512 1513 CXXBaseOrMemberInitializer *CXXBaseInit = 1514 new (Context) CXXBaseOrMemberInitializer(Context, 1515 Context.getTrivialTypeSourceInfo(VBase->getType(), 1516 SourceLocation()), 1517 SourceLocation(), 1518 BaseInit.takeAs<Expr>(), 1519 SourceLocation()); 1520 AllToInit.push_back(CXXBaseInit); 1521 } 1522 } 1523 1524 for (CXXRecordDecl::base_class_iterator Base = 1525 ClassDecl->bases_begin(), 1526 E = ClassDecl->bases_end(); Base != E; ++Base) { 1527 // Virtuals are in the virtual base list and already constructed. 1528 if (Base->isVirtual()) 1529 continue; 1530 // Skip dependent types. 1531 if (Base->getType()->isDependentType()) 1532 continue; 1533 if (CXXBaseOrMemberInitializer *Value 1534 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1535 AllToInit.push_back(Value); 1536 } 1537 else if (!AnyErrors) { 1538 InitializedEntity InitEntity 1539 = InitializedEntity::InitializeBase(Context, Base); 1540 InitializationKind InitKind 1541 = InitializationKind::CreateDefault(Constructor->getLocation()); 1542 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1543 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1544 MultiExprArg(*this, 0, 0)); 1545 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1546 if (BaseInit.isInvalid()) { 1547 HadError = true; 1548 continue; 1549 } 1550 1551 // Don't attach synthesized base initializers in a dependent 1552 // context; they'll be regenerated at template instantiation 1553 // time. 1554 if (CurContext->isDependentContext()) 1555 continue; 1556 1557 CXXBaseOrMemberInitializer *CXXBaseInit = 1558 new (Context) CXXBaseOrMemberInitializer(Context, 1559 Context.getTrivialTypeSourceInfo(Base->getType(), 1560 SourceLocation()), 1561 SourceLocation(), 1562 BaseInit.takeAs<Expr>(), 1563 SourceLocation()); 1564 AllToInit.push_back(CXXBaseInit); 1565 } 1566 } 1567 } 1568 1569 // non-static data members. 1570 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1571 E = ClassDecl->field_end(); Field != E; ++Field) { 1572 if ((*Field)->isAnonymousStructOrUnion()) { 1573 if (const RecordType *FieldClassType = 1574 Field->getType()->getAs<RecordType>()) { 1575 CXXRecordDecl *FieldClassDecl 1576 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1577 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1578 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1579 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1580 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1581 // set to the anonymous union data member used in the initializer 1582 // list. 1583 Value->setMember(*Field); 1584 Value->setAnonUnionMember(*FA); 1585 AllToInit.push_back(Value); 1586 break; 1587 } 1588 } 1589 } 1590 continue; 1591 } 1592 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1593 AllToInit.push_back(Value); 1594 continue; 1595 } 1596 1597 if ((*Field)->getType()->isDependentType() || AnyErrors) 1598 continue; 1599 1600 QualType FT = Context.getBaseElementType((*Field)->getType()); 1601 if (FT->getAs<RecordType>()) { 1602 InitializedEntity InitEntity 1603 = InitializedEntity::InitializeMember(*Field); 1604 InitializationKind InitKind 1605 = InitializationKind::CreateDefault(Constructor->getLocation()); 1606 1607 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1608 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1609 MultiExprArg(*this, 0, 0)); 1610 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1611 if (MemberInit.isInvalid()) { 1612 HadError = true; 1613 continue; 1614 } 1615 1616 // Don't attach synthesized member initializers in a dependent 1617 // context; they'll be regenerated a template instantiation 1618 // time. 1619 if (CurContext->isDependentContext()) 1620 continue; 1621 1622 CXXBaseOrMemberInitializer *Member = 1623 new (Context) CXXBaseOrMemberInitializer(Context, 1624 *Field, SourceLocation(), 1625 SourceLocation(), 1626 MemberInit.takeAs<Expr>(), 1627 SourceLocation()); 1628 1629 AllToInit.push_back(Member); 1630 } 1631 else if (FT->isReferenceType()) { 1632 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1633 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1634 << 0 << (*Field)->getDeclName(); 1635 Diag((*Field)->getLocation(), diag::note_declared_at); 1636 HadError = true; 1637 } 1638 else if (FT.isConstQualified()) { 1639 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1640 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1641 << 1 << (*Field)->getDeclName(); 1642 Diag((*Field)->getLocation(), diag::note_declared_at); 1643 HadError = true; 1644 } 1645 } 1646 1647 NumInitializers = AllToInit.size(); 1648 if (NumInitializers > 0) { 1649 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1650 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1651 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1652 memcpy(baseOrMemberInitializers, AllToInit.data(), 1653 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1654 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1655 1656 // Constructors implicitly reference the base and member 1657 // destructors. 1658 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1659 Constructor->getParent()); 1660 } 1661 1662 return HadError; 1663} 1664 1665static void *GetKeyForTopLevelField(FieldDecl *Field) { 1666 // For anonymous unions, use the class declaration as the key. 1667 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1668 if (RT->getDecl()->isAnonymousStructOrUnion()) 1669 return static_cast<void *>(RT->getDecl()); 1670 } 1671 return static_cast<void *>(Field); 1672} 1673 1674static void *GetKeyForBase(QualType BaseType) { 1675 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1676 return (void *)RT; 1677 1678 assert(0 && "Unexpected base type!"); 1679 return 0; 1680} 1681 1682static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1683 bool MemberMaybeAnon = false) { 1684 if (!Member->isMemberInitializer()) 1685 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1686 1687 // For fields injected into the class via declaration of an anonymous union, 1688 // use its anonymous union class declaration as the unique key. 1689 FieldDecl *Field = Member->getMember(); 1690 1691 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1692 // data member of the class. Data member used in the initializer list is 1693 // in AnonUnionMember field. 1694 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1695 Field = Member->getAnonUnionMember(); 1696 1697 // If the field is a member of an anonymous union, we use record decl of the 1698 // union as the key. 1699 RecordDecl *RD = Field->getParent(); 1700 if (RD->isAnonymousStructOrUnion() && RD->isUnion()) 1701 return static_cast<void *>(RD); 1702 1703 return static_cast<void *>(Field); 1704} 1705 1706static void 1707DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1708 const CXXConstructorDecl *Constructor, 1709 CXXBaseOrMemberInitializer **MemInits, 1710 unsigned NumMemInits) { 1711 if (Constructor->isDependentContext()) 1712 return; 1713 1714 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1715 Diagnostic::Ignored && 1716 SemaRef.Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1717 Diagnostic::Ignored) 1718 return; 1719 1720 // Also issue warning if order of ctor-initializer list does not match order 1721 // of 1) base class declarations and 2) order of non-static data members. 1722 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1723 1724 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1725 1726 // Push virtual bases before others. 1727 for (CXXRecordDecl::base_class_const_iterator VBase = 1728 ClassDecl->vbases_begin(), 1729 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1730 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1731 1732 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1733 E = ClassDecl->bases_end(); Base != E; ++Base) { 1734 // Virtuals are alread in the virtual base list and are constructed 1735 // first. 1736 if (Base->isVirtual()) 1737 continue; 1738 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1739 } 1740 1741 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1742 E = ClassDecl->field_end(); Field != E; ++Field) 1743 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1744 1745 int Last = AllBaseOrMembers.size(); 1746 int curIndex = 0; 1747 CXXBaseOrMemberInitializer *PrevMember = 0; 1748 for (unsigned i = 0; i < NumMemInits; i++) { 1749 CXXBaseOrMemberInitializer *Member = MemInits[i]; 1750 void *MemberInCtorList = GetKeyForMember(Member, true); 1751 1752 for (; curIndex < Last; curIndex++) 1753 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1754 break; 1755 if (curIndex == Last) { 1756 assert(PrevMember && "Member not in member list?!"); 1757 // Initializer as specified in ctor-initializer list is out of order. 1758 // Issue a warning diagnostic. 1759 if (PrevMember->isBaseInitializer()) { 1760 // Diagnostics is for an initialized base class. 1761 Type *BaseClass = PrevMember->getBaseClass(); 1762 SemaRef.Diag(PrevMember->getSourceLocation(), 1763 diag::warn_base_initialized) 1764 << QualType(BaseClass, 0); 1765 } else { 1766 FieldDecl *Field = PrevMember->getMember(); 1767 SemaRef.Diag(PrevMember->getSourceLocation(), 1768 diag::warn_field_initialized) 1769 << Field->getNameAsString(); 1770 } 1771 // Also the note! 1772 if (FieldDecl *Field = Member->getMember()) 1773 SemaRef.Diag(Member->getSourceLocation(), 1774 diag::note_fieldorbase_initialized_here) << 0 1775 << Field->getNameAsString(); 1776 else { 1777 Type *BaseClass = Member->getBaseClass(); 1778 SemaRef.Diag(Member->getSourceLocation(), 1779 diag::note_fieldorbase_initialized_here) << 1 1780 << QualType(BaseClass, 0); 1781 } 1782 for (curIndex = 0; curIndex < Last; curIndex++) 1783 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1784 break; 1785 } 1786 PrevMember = Member; 1787 } 1788} 1789 1790/// ActOnMemInitializers - Handle the member initializers for a constructor. 1791void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1792 SourceLocation ColonLoc, 1793 MemInitTy **meminits, unsigned NumMemInits, 1794 bool AnyErrors) { 1795 if (!ConstructorDecl) 1796 return; 1797 1798 AdjustDeclIfTemplate(ConstructorDecl); 1799 1800 CXXConstructorDecl *Constructor 1801 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1802 1803 if (!Constructor) { 1804 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1805 return; 1806 } 1807 1808 CXXBaseOrMemberInitializer **MemInits = 1809 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1810 1811 if (!Constructor->isDependentContext()) { 1812 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1813 bool err = false; 1814 for (unsigned i = 0; i < NumMemInits; i++) { 1815 CXXBaseOrMemberInitializer *Member = MemInits[i]; 1816 1817 void *KeyToMember = GetKeyForMember(Member); 1818 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1819 if (!PrevMember) { 1820 PrevMember = Member; 1821 continue; 1822 } 1823 if (FieldDecl *Field = Member->getMember()) 1824 Diag(Member->getSourceLocation(), 1825 diag::error_multiple_mem_initialization) 1826 << Field->getNameAsString() 1827 << Member->getSourceRange(); 1828 else { 1829 Type *BaseClass = Member->getBaseClass(); 1830 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1831 Diag(Member->getSourceLocation(), 1832 diag::error_multiple_base_initialization) 1833 << QualType(BaseClass, 0) 1834 << Member->getSourceRange(); 1835 } 1836 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1837 << 0; 1838 err = true; 1839 } 1840 1841 if (err) 1842 return; 1843 } 1844 1845 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, 1846 /*IsImplicitConstructor=*/false, AnyErrors); 1847 1848 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1849} 1850 1851void 1852Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1853 CXXRecordDecl *ClassDecl) { 1854 // Ignore dependent contexts. 1855 if (ClassDecl->isDependentContext()) 1856 return; 1857 1858 // FIXME: all the access-control diagnostics are positioned on the 1859 // field/base declaration. That's probably good; that said, the 1860 // user might reasonably want to know why the destructor is being 1861 // emitted, and we currently don't say. 1862 1863 // Non-static data members. 1864 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1865 E = ClassDecl->field_end(); I != E; ++I) { 1866 FieldDecl *Field = *I; 1867 1868 QualType FieldType = Context.getBaseElementType(Field->getType()); 1869 1870 const RecordType* RT = FieldType->getAs<RecordType>(); 1871 if (!RT) 1872 continue; 1873 1874 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1875 if (FieldClassDecl->hasTrivialDestructor()) 1876 continue; 1877 1878 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1879 CheckDestructorAccess(Field->getLocation(), Dtor, 1880 PDiag(diag::err_access_dtor_field) 1881 << Field->getDeclName() 1882 << FieldType); 1883 1884 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1885 } 1886 1887 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1888 1889 // Bases. 1890 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1891 E = ClassDecl->bases_end(); Base != E; ++Base) { 1892 // Bases are always records in a well-formed non-dependent class. 1893 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1894 1895 // Remember direct virtual bases. 1896 if (Base->isVirtual()) 1897 DirectVirtualBases.insert(RT); 1898 1899 // Ignore trivial destructors. 1900 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1901 if (BaseClassDecl->hasTrivialDestructor()) 1902 continue; 1903 1904 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1905 1906 // FIXME: caret should be on the start of the class name 1907 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1908 PDiag(diag::err_access_dtor_base) 1909 << Base->getType() 1910 << Base->getSourceRange()); 1911 1912 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1913 } 1914 1915 // Virtual bases. 1916 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1917 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1918 1919 // Bases are always records in a well-formed non-dependent class. 1920 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1921 1922 // Ignore direct virtual bases. 1923 if (DirectVirtualBases.count(RT)) 1924 continue; 1925 1926 // Ignore trivial destructors. 1927 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1928 if (BaseClassDecl->hasTrivialDestructor()) 1929 continue; 1930 1931 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1932 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1933 PDiag(diag::err_access_dtor_vbase) 1934 << VBase->getType()); 1935 1936 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1937 } 1938} 1939 1940void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1941 if (!CDtorDecl) 1942 return; 1943 1944 if (CXXConstructorDecl *Constructor 1945 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1946 SetBaseOrMemberInitializers(Constructor, 0, 0, 1947 /*IsImplicitConstructor=*/false, 1948 /*AnyErrors=*/false); 1949} 1950 1951bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1952 unsigned DiagID, AbstractDiagSelID SelID, 1953 const CXXRecordDecl *CurrentRD) { 1954 if (SelID == -1) 1955 return RequireNonAbstractType(Loc, T, 1956 PDiag(DiagID), CurrentRD); 1957 else 1958 return RequireNonAbstractType(Loc, T, 1959 PDiag(DiagID) << SelID, CurrentRD); 1960} 1961 1962bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1963 const PartialDiagnostic &PD, 1964 const CXXRecordDecl *CurrentRD) { 1965 if (!getLangOptions().CPlusPlus) 1966 return false; 1967 1968 if (const ArrayType *AT = Context.getAsArrayType(T)) 1969 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1970 CurrentRD); 1971 1972 if (const PointerType *PT = T->getAs<PointerType>()) { 1973 // Find the innermost pointer type. 1974 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1975 PT = T; 1976 1977 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1978 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1979 } 1980 1981 const RecordType *RT = T->getAs<RecordType>(); 1982 if (!RT) 1983 return false; 1984 1985 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1986 1987 if (CurrentRD && CurrentRD != RD) 1988 return false; 1989 1990 // FIXME: is this reasonable? It matches current behavior, but.... 1991 if (!RD->getDefinition()) 1992 return false; 1993 1994 if (!RD->isAbstract()) 1995 return false; 1996 1997 Diag(Loc, PD) << RD->getDeclName(); 1998 1999 // Check if we've already emitted the list of pure virtual functions for this 2000 // class. 2001 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2002 return true; 2003 2004 CXXFinalOverriderMap FinalOverriders; 2005 RD->getFinalOverriders(FinalOverriders); 2006 2007 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2008 MEnd = FinalOverriders.end(); 2009 M != MEnd; 2010 ++M) { 2011 for (OverridingMethods::iterator SO = M->second.begin(), 2012 SOEnd = M->second.end(); 2013 SO != SOEnd; ++SO) { 2014 // C++ [class.abstract]p4: 2015 // A class is abstract if it contains or inherits at least one 2016 // pure virtual function for which the final overrider is pure 2017 // virtual. 2018 2019 // 2020 if (SO->second.size() != 1) 2021 continue; 2022 2023 if (!SO->second.front().Method->isPure()) 2024 continue; 2025 2026 Diag(SO->second.front().Method->getLocation(), 2027 diag::note_pure_virtual_function) 2028 << SO->second.front().Method->getDeclName(); 2029 } 2030 } 2031 2032 if (!PureVirtualClassDiagSet) 2033 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2034 PureVirtualClassDiagSet->insert(RD); 2035 2036 return true; 2037} 2038 2039namespace { 2040 class AbstractClassUsageDiagnoser 2041 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2042 Sema &SemaRef; 2043 CXXRecordDecl *AbstractClass; 2044 2045 bool VisitDeclContext(const DeclContext *DC) { 2046 bool Invalid = false; 2047 2048 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2049 E = DC->decls_end(); I != E; ++I) 2050 Invalid |= Visit(*I); 2051 2052 return Invalid; 2053 } 2054 2055 public: 2056 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2057 : SemaRef(SemaRef), AbstractClass(ac) { 2058 Visit(SemaRef.Context.getTranslationUnitDecl()); 2059 } 2060 2061 bool VisitFunctionDecl(const FunctionDecl *FD) { 2062 if (FD->isThisDeclarationADefinition()) { 2063 // No need to do the check if we're in a definition, because it requires 2064 // that the return/param types are complete. 2065 // because that requires 2066 return VisitDeclContext(FD); 2067 } 2068 2069 // Check the return type. 2070 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2071 bool Invalid = 2072 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2073 diag::err_abstract_type_in_decl, 2074 Sema::AbstractReturnType, 2075 AbstractClass); 2076 2077 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2078 E = FD->param_end(); I != E; ++I) { 2079 const ParmVarDecl *VD = *I; 2080 Invalid |= 2081 SemaRef.RequireNonAbstractType(VD->getLocation(), 2082 VD->getOriginalType(), 2083 diag::err_abstract_type_in_decl, 2084 Sema::AbstractParamType, 2085 AbstractClass); 2086 } 2087 2088 return Invalid; 2089 } 2090 2091 bool VisitDecl(const Decl* D) { 2092 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2093 return VisitDeclContext(DC); 2094 2095 return false; 2096 } 2097 }; 2098} 2099 2100/// \brief Perform semantic checks on a class definition that has been 2101/// completing, introducing implicitly-declared members, checking for 2102/// abstract types, etc. 2103void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2104 if (!Record || Record->isInvalidDecl()) 2105 return; 2106 2107 if (!Record->isDependentType()) 2108 AddImplicitlyDeclaredMembersToClass(Record); 2109 2110 if (Record->isInvalidDecl()) 2111 return; 2112 2113 // Set access bits correctly on the directly-declared conversions. 2114 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2115 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2116 Convs->setAccess(I, (*I)->getAccess()); 2117 2118 // Determine whether we need to check for final overriders. We do 2119 // this either when there are virtual base classes (in which case we 2120 // may end up finding multiple final overriders for a given virtual 2121 // function) or any of the base classes is abstract (in which case 2122 // we might detect that this class is abstract). 2123 bool CheckFinalOverriders = false; 2124 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2125 !Record->isDependentType()) { 2126 if (Record->getNumVBases()) 2127 CheckFinalOverriders = true; 2128 else if (!Record->isAbstract()) { 2129 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2130 BEnd = Record->bases_end(); 2131 B != BEnd; ++B) { 2132 CXXRecordDecl *BaseDecl 2133 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2134 if (BaseDecl->isAbstract()) { 2135 CheckFinalOverriders = true; 2136 break; 2137 } 2138 } 2139 } 2140 } 2141 2142 if (CheckFinalOverriders) { 2143 CXXFinalOverriderMap FinalOverriders; 2144 Record->getFinalOverriders(FinalOverriders); 2145 2146 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2147 MEnd = FinalOverriders.end(); 2148 M != MEnd; ++M) { 2149 for (OverridingMethods::iterator SO = M->second.begin(), 2150 SOEnd = M->second.end(); 2151 SO != SOEnd; ++SO) { 2152 assert(SO->second.size() > 0 && 2153 "All virtual functions have overridding virtual functions"); 2154 if (SO->second.size() == 1) { 2155 // C++ [class.abstract]p4: 2156 // A class is abstract if it contains or inherits at least one 2157 // pure virtual function for which the final overrider is pure 2158 // virtual. 2159 if (SO->second.front().Method->isPure()) 2160 Record->setAbstract(true); 2161 continue; 2162 } 2163 2164 // C++ [class.virtual]p2: 2165 // In a derived class, if a virtual member function of a base 2166 // class subobject has more than one final overrider the 2167 // program is ill-formed. 2168 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2169 << (NamedDecl *)M->first << Record; 2170 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2171 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2172 OMEnd = SO->second.end(); 2173 OM != OMEnd; ++OM) 2174 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2175 << (NamedDecl *)M->first << OM->Method->getParent(); 2176 2177 Record->setInvalidDecl(); 2178 } 2179 } 2180 } 2181 2182 if (Record->isAbstract() && !Record->isInvalidDecl()) 2183 (void)AbstractClassUsageDiagnoser(*this, Record); 2184} 2185 2186void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2187 DeclPtrTy TagDecl, 2188 SourceLocation LBrac, 2189 SourceLocation RBrac, 2190 AttributeList *AttrList) { 2191 if (!TagDecl) 2192 return; 2193 2194 AdjustDeclIfTemplate(TagDecl); 2195 2196 ActOnFields(S, RLoc, TagDecl, 2197 (DeclPtrTy*)FieldCollector->getCurFields(), 2198 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2199 2200 CheckCompletedCXXClass( 2201 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2202} 2203 2204/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2205/// special functions, such as the default constructor, copy 2206/// constructor, or destructor, to the given C++ class (C++ 2207/// [special]p1). This routine can only be executed just before the 2208/// definition of the class is complete. 2209void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2210 CanQualType ClassType 2211 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2212 2213 // FIXME: Implicit declarations have exception specifications, which are 2214 // the union of the specifications of the implicitly called functions. 2215 2216 if (!ClassDecl->hasUserDeclaredConstructor()) { 2217 // C++ [class.ctor]p5: 2218 // A default constructor for a class X is a constructor of class X 2219 // that can be called without an argument. If there is no 2220 // user-declared constructor for class X, a default constructor is 2221 // implicitly declared. An implicitly-declared default constructor 2222 // is an inline public member of its class. 2223 DeclarationName Name 2224 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2225 CXXConstructorDecl *DefaultCon = 2226 CXXConstructorDecl::Create(Context, ClassDecl, 2227 ClassDecl->getLocation(), Name, 2228 Context.getFunctionType(Context.VoidTy, 2229 0, 0, false, 0, 2230 /*FIXME*/false, false, 2231 0, 0, 2232 FunctionType::ExtInfo()), 2233 /*TInfo=*/0, 2234 /*isExplicit=*/false, 2235 /*isInline=*/true, 2236 /*isImplicitlyDeclared=*/true); 2237 DefaultCon->setAccess(AS_public); 2238 DefaultCon->setImplicit(); 2239 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2240 ClassDecl->addDecl(DefaultCon); 2241 } 2242 2243 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2244 // C++ [class.copy]p4: 2245 // If the class definition does not explicitly declare a copy 2246 // constructor, one is declared implicitly. 2247 2248 // C++ [class.copy]p5: 2249 // The implicitly-declared copy constructor for a class X will 2250 // have the form 2251 // 2252 // X::X(const X&) 2253 // 2254 // if 2255 bool HasConstCopyConstructor = true; 2256 2257 // -- each direct or virtual base class B of X has a copy 2258 // constructor whose first parameter is of type const B& or 2259 // const volatile B&, and 2260 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2261 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2262 const CXXRecordDecl *BaseClassDecl 2263 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2264 HasConstCopyConstructor 2265 = BaseClassDecl->hasConstCopyConstructor(Context); 2266 } 2267 2268 // -- for all the nonstatic data members of X that are of a 2269 // class type M (or array thereof), each such class type 2270 // has a copy constructor whose first parameter is of type 2271 // const M& or const volatile M&. 2272 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2273 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2274 ++Field) { 2275 QualType FieldType = (*Field)->getType(); 2276 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2277 FieldType = Array->getElementType(); 2278 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2279 const CXXRecordDecl *FieldClassDecl 2280 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2281 HasConstCopyConstructor 2282 = FieldClassDecl->hasConstCopyConstructor(Context); 2283 } 2284 } 2285 2286 // Otherwise, the implicitly declared copy constructor will have 2287 // the form 2288 // 2289 // X::X(X&) 2290 QualType ArgType = ClassType; 2291 if (HasConstCopyConstructor) 2292 ArgType = ArgType.withConst(); 2293 ArgType = Context.getLValueReferenceType(ArgType); 2294 2295 // An implicitly-declared copy constructor is an inline public 2296 // member of its class. 2297 DeclarationName Name 2298 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2299 CXXConstructorDecl *CopyConstructor 2300 = CXXConstructorDecl::Create(Context, ClassDecl, 2301 ClassDecl->getLocation(), Name, 2302 Context.getFunctionType(Context.VoidTy, 2303 &ArgType, 1, 2304 false, 0, 2305 /*FIXME:*/false, 2306 false, 0, 0, 2307 FunctionType::ExtInfo()), 2308 /*TInfo=*/0, 2309 /*isExplicit=*/false, 2310 /*isInline=*/true, 2311 /*isImplicitlyDeclared=*/true); 2312 CopyConstructor->setAccess(AS_public); 2313 CopyConstructor->setImplicit(); 2314 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2315 2316 // Add the parameter to the constructor. 2317 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2318 ClassDecl->getLocation(), 2319 /*IdentifierInfo=*/0, 2320 ArgType, /*TInfo=*/0, 2321 VarDecl::None, 0); 2322 CopyConstructor->setParams(&FromParam, 1); 2323 ClassDecl->addDecl(CopyConstructor); 2324 } 2325 2326 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2327 // Note: The following rules are largely analoguous to the copy 2328 // constructor rules. Note that virtual bases are not taken into account 2329 // for determining the argument type of the operator. Note also that 2330 // operators taking an object instead of a reference are allowed. 2331 // 2332 // C++ [class.copy]p10: 2333 // If the class definition does not explicitly declare a copy 2334 // assignment operator, one is declared implicitly. 2335 // The implicitly-defined copy assignment operator for a class X 2336 // will have the form 2337 // 2338 // X& X::operator=(const X&) 2339 // 2340 // if 2341 bool HasConstCopyAssignment = true; 2342 2343 // -- each direct base class B of X has a copy assignment operator 2344 // whose parameter is of type const B&, const volatile B& or B, 2345 // and 2346 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2347 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2348 assert(!Base->getType()->isDependentType() && 2349 "Cannot generate implicit members for class with dependent bases."); 2350 const CXXRecordDecl *BaseClassDecl 2351 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2352 const CXXMethodDecl *MD = 0; 2353 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2354 MD); 2355 } 2356 2357 // -- for all the nonstatic data members of X that are of a class 2358 // type M (or array thereof), each such class type has a copy 2359 // assignment operator whose parameter is of type const M&, 2360 // const volatile M& or M. 2361 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2362 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2363 ++Field) { 2364 QualType FieldType = (*Field)->getType(); 2365 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2366 FieldType = Array->getElementType(); 2367 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2368 const CXXRecordDecl *FieldClassDecl 2369 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2370 const CXXMethodDecl *MD = 0; 2371 HasConstCopyAssignment 2372 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2373 } 2374 } 2375 2376 // Otherwise, the implicitly declared copy assignment operator will 2377 // have the form 2378 // 2379 // X& X::operator=(X&) 2380 QualType ArgType = ClassType; 2381 QualType RetType = Context.getLValueReferenceType(ArgType); 2382 if (HasConstCopyAssignment) 2383 ArgType = ArgType.withConst(); 2384 ArgType = Context.getLValueReferenceType(ArgType); 2385 2386 // An implicitly-declared copy assignment operator is an inline public 2387 // member of its class. 2388 DeclarationName Name = 2389 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2390 CXXMethodDecl *CopyAssignment = 2391 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2392 Context.getFunctionType(RetType, &ArgType, 1, 2393 false, 0, 2394 /*FIXME:*/false, 2395 false, 0, 0, 2396 FunctionType::ExtInfo()), 2397 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2398 CopyAssignment->setAccess(AS_public); 2399 CopyAssignment->setImplicit(); 2400 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2401 CopyAssignment->setCopyAssignment(true); 2402 2403 // Add the parameter to the operator. 2404 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2405 ClassDecl->getLocation(), 2406 /*IdentifierInfo=*/0, 2407 ArgType, /*TInfo=*/0, 2408 VarDecl::None, 0); 2409 CopyAssignment->setParams(&FromParam, 1); 2410 2411 // Don't call addedAssignmentOperator. There is no way to distinguish an 2412 // implicit from an explicit assignment operator. 2413 ClassDecl->addDecl(CopyAssignment); 2414 AddOverriddenMethods(ClassDecl, CopyAssignment); 2415 } 2416 2417 if (!ClassDecl->hasUserDeclaredDestructor()) { 2418 // C++ [class.dtor]p2: 2419 // If a class has no user-declared destructor, a destructor is 2420 // declared implicitly. An implicitly-declared destructor is an 2421 // inline public member of its class. 2422 QualType Ty = Context.getFunctionType(Context.VoidTy, 2423 0, 0, false, 0, 2424 /*FIXME:*/false, 2425 false, 0, 0, FunctionType::ExtInfo()); 2426 2427 DeclarationName Name 2428 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2429 CXXDestructorDecl *Destructor 2430 = CXXDestructorDecl::Create(Context, ClassDecl, 2431 ClassDecl->getLocation(), Name, Ty, 2432 /*isInline=*/true, 2433 /*isImplicitlyDeclared=*/true); 2434 Destructor->setAccess(AS_public); 2435 Destructor->setImplicit(); 2436 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2437 ClassDecl->addDecl(Destructor); 2438 2439 // This could be uniqued if it ever proves significant. 2440 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2441 2442 AddOverriddenMethods(ClassDecl, Destructor); 2443 } 2444} 2445 2446void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2447 Decl *D = TemplateD.getAs<Decl>(); 2448 if (!D) 2449 return; 2450 2451 TemplateParameterList *Params = 0; 2452 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2453 Params = Template->getTemplateParameters(); 2454 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2455 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2456 Params = PartialSpec->getTemplateParameters(); 2457 else 2458 return; 2459 2460 for (TemplateParameterList::iterator Param = Params->begin(), 2461 ParamEnd = Params->end(); 2462 Param != ParamEnd; ++Param) { 2463 NamedDecl *Named = cast<NamedDecl>(*Param); 2464 if (Named->getDeclName()) { 2465 S->AddDecl(DeclPtrTy::make(Named)); 2466 IdResolver.AddDecl(Named); 2467 } 2468 } 2469} 2470 2471void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2472 if (!RecordD) return; 2473 AdjustDeclIfTemplate(RecordD); 2474 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2475 PushDeclContext(S, Record); 2476} 2477 2478void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2479 if (!RecordD) return; 2480 PopDeclContext(); 2481} 2482 2483/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2484/// parsing a top-level (non-nested) C++ class, and we are now 2485/// parsing those parts of the given Method declaration that could 2486/// not be parsed earlier (C++ [class.mem]p2), such as default 2487/// arguments. This action should enter the scope of the given 2488/// Method declaration as if we had just parsed the qualified method 2489/// name. However, it should not bring the parameters into scope; 2490/// that will be performed by ActOnDelayedCXXMethodParameter. 2491void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2492} 2493 2494/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2495/// C++ method declaration. We're (re-)introducing the given 2496/// function parameter into scope for use in parsing later parts of 2497/// the method declaration. For example, we could see an 2498/// ActOnParamDefaultArgument event for this parameter. 2499void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2500 if (!ParamD) 2501 return; 2502 2503 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2504 2505 // If this parameter has an unparsed default argument, clear it out 2506 // to make way for the parsed default argument. 2507 if (Param->hasUnparsedDefaultArg()) 2508 Param->setDefaultArg(0); 2509 2510 S->AddDecl(DeclPtrTy::make(Param)); 2511 if (Param->getDeclName()) 2512 IdResolver.AddDecl(Param); 2513} 2514 2515/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2516/// processing the delayed method declaration for Method. The method 2517/// declaration is now considered finished. There may be a separate 2518/// ActOnStartOfFunctionDef action later (not necessarily 2519/// immediately!) for this method, if it was also defined inside the 2520/// class body. 2521void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2522 if (!MethodD) 2523 return; 2524 2525 AdjustDeclIfTemplate(MethodD); 2526 2527 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2528 2529 // Now that we have our default arguments, check the constructor 2530 // again. It could produce additional diagnostics or affect whether 2531 // the class has implicitly-declared destructors, among other 2532 // things. 2533 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2534 CheckConstructor(Constructor); 2535 2536 // Check the default arguments, which we may have added. 2537 if (!Method->isInvalidDecl()) 2538 CheckCXXDefaultArguments(Method); 2539} 2540 2541/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2542/// the well-formedness of the constructor declarator @p D with type @p 2543/// R. If there are any errors in the declarator, this routine will 2544/// emit diagnostics and set the invalid bit to true. In any case, the type 2545/// will be updated to reflect a well-formed type for the constructor and 2546/// returned. 2547QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2548 FunctionDecl::StorageClass &SC) { 2549 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2550 2551 // C++ [class.ctor]p3: 2552 // A constructor shall not be virtual (10.3) or static (9.4). A 2553 // constructor can be invoked for a const, volatile or const 2554 // volatile object. A constructor shall not be declared const, 2555 // volatile, or const volatile (9.3.2). 2556 if (isVirtual) { 2557 if (!D.isInvalidType()) 2558 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2559 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2560 << SourceRange(D.getIdentifierLoc()); 2561 D.setInvalidType(); 2562 } 2563 if (SC == FunctionDecl::Static) { 2564 if (!D.isInvalidType()) 2565 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2566 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2567 << SourceRange(D.getIdentifierLoc()); 2568 D.setInvalidType(); 2569 SC = FunctionDecl::None; 2570 } 2571 2572 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2573 if (FTI.TypeQuals != 0) { 2574 if (FTI.TypeQuals & Qualifiers::Const) 2575 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2576 << "const" << SourceRange(D.getIdentifierLoc()); 2577 if (FTI.TypeQuals & Qualifiers::Volatile) 2578 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2579 << "volatile" << SourceRange(D.getIdentifierLoc()); 2580 if (FTI.TypeQuals & Qualifiers::Restrict) 2581 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2582 << "restrict" << SourceRange(D.getIdentifierLoc()); 2583 } 2584 2585 // Rebuild the function type "R" without any type qualifiers (in 2586 // case any of the errors above fired) and with "void" as the 2587 // return type, since constructors don't have return types. We 2588 // *always* have to do this, because GetTypeForDeclarator will 2589 // put in a result type of "int" when none was specified. 2590 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2591 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2592 Proto->getNumArgs(), 2593 Proto->isVariadic(), 0, 2594 Proto->hasExceptionSpec(), 2595 Proto->hasAnyExceptionSpec(), 2596 Proto->getNumExceptions(), 2597 Proto->exception_begin(), 2598 Proto->getExtInfo()); 2599} 2600 2601/// CheckConstructor - Checks a fully-formed constructor for 2602/// well-formedness, issuing any diagnostics required. Returns true if 2603/// the constructor declarator is invalid. 2604void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2605 CXXRecordDecl *ClassDecl 2606 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2607 if (!ClassDecl) 2608 return Constructor->setInvalidDecl(); 2609 2610 // C++ [class.copy]p3: 2611 // A declaration of a constructor for a class X is ill-formed if 2612 // its first parameter is of type (optionally cv-qualified) X and 2613 // either there are no other parameters or else all other 2614 // parameters have default arguments. 2615 if (!Constructor->isInvalidDecl() && 2616 ((Constructor->getNumParams() == 1) || 2617 (Constructor->getNumParams() > 1 && 2618 Constructor->getParamDecl(1)->hasDefaultArg())) && 2619 Constructor->getTemplateSpecializationKind() 2620 != TSK_ImplicitInstantiation) { 2621 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2622 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2623 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2624 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2625 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2626 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2627 2628 // FIXME: Rather that making the constructor invalid, we should endeavor 2629 // to fix the type. 2630 Constructor->setInvalidDecl(); 2631 } 2632 } 2633 2634 // Notify the class that we've added a constructor. 2635 ClassDecl->addedConstructor(Context, Constructor); 2636} 2637 2638/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2639/// issuing any diagnostics required. Returns true on error. 2640bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2641 CXXRecordDecl *RD = Destructor->getParent(); 2642 2643 if (Destructor->isVirtual()) { 2644 SourceLocation Loc; 2645 2646 if (!Destructor->isImplicit()) 2647 Loc = Destructor->getLocation(); 2648 else 2649 Loc = RD->getLocation(); 2650 2651 // If we have a virtual destructor, look up the deallocation function 2652 FunctionDecl *OperatorDelete = 0; 2653 DeclarationName Name = 2654 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2655 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2656 return true; 2657 2658 Destructor->setOperatorDelete(OperatorDelete); 2659 } 2660 2661 return false; 2662} 2663 2664static inline bool 2665FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2666 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2667 FTI.ArgInfo[0].Param && 2668 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2669} 2670 2671/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2672/// the well-formednes of the destructor declarator @p D with type @p 2673/// R. If there are any errors in the declarator, this routine will 2674/// emit diagnostics and set the declarator to invalid. Even if this happens, 2675/// will be updated to reflect a well-formed type for the destructor and 2676/// returned. 2677QualType Sema::CheckDestructorDeclarator(Declarator &D, 2678 FunctionDecl::StorageClass& SC) { 2679 // C++ [class.dtor]p1: 2680 // [...] A typedef-name that names a class is a class-name 2681 // (7.1.3); however, a typedef-name that names a class shall not 2682 // be used as the identifier in the declarator for a destructor 2683 // declaration. 2684 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2685 if (isa<TypedefType>(DeclaratorType)) { 2686 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2687 << DeclaratorType; 2688 D.setInvalidType(); 2689 } 2690 2691 // C++ [class.dtor]p2: 2692 // A destructor is used to destroy objects of its class type. A 2693 // destructor takes no parameters, and no return type can be 2694 // specified for it (not even void). The address of a destructor 2695 // shall not be taken. A destructor shall not be static. A 2696 // destructor can be invoked for a const, volatile or const 2697 // volatile object. A destructor shall not be declared const, 2698 // volatile or const volatile (9.3.2). 2699 if (SC == FunctionDecl::Static) { 2700 if (!D.isInvalidType()) 2701 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2702 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2703 << SourceRange(D.getIdentifierLoc()); 2704 SC = FunctionDecl::None; 2705 D.setInvalidType(); 2706 } 2707 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2708 // Destructors don't have return types, but the parser will 2709 // happily parse something like: 2710 // 2711 // class X { 2712 // float ~X(); 2713 // }; 2714 // 2715 // The return type will be eliminated later. 2716 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2717 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2718 << SourceRange(D.getIdentifierLoc()); 2719 } 2720 2721 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2722 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2723 if (FTI.TypeQuals & Qualifiers::Const) 2724 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2725 << "const" << SourceRange(D.getIdentifierLoc()); 2726 if (FTI.TypeQuals & Qualifiers::Volatile) 2727 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2728 << "volatile" << SourceRange(D.getIdentifierLoc()); 2729 if (FTI.TypeQuals & Qualifiers::Restrict) 2730 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2731 << "restrict" << SourceRange(D.getIdentifierLoc()); 2732 D.setInvalidType(); 2733 } 2734 2735 // Make sure we don't have any parameters. 2736 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2737 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2738 2739 // Delete the parameters. 2740 FTI.freeArgs(); 2741 D.setInvalidType(); 2742 } 2743 2744 // Make sure the destructor isn't variadic. 2745 if (FTI.isVariadic) { 2746 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2747 D.setInvalidType(); 2748 } 2749 2750 // Rebuild the function type "R" without any type qualifiers or 2751 // parameters (in case any of the errors above fired) and with 2752 // "void" as the return type, since destructors don't have return 2753 // types. We *always* have to do this, because GetTypeForDeclarator 2754 // will put in a result type of "int" when none was specified. 2755 // FIXME: Exceptions! 2756 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2757 false, false, 0, 0, FunctionType::ExtInfo()); 2758} 2759 2760/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2761/// well-formednes of the conversion function declarator @p D with 2762/// type @p R. If there are any errors in the declarator, this routine 2763/// will emit diagnostics and return true. Otherwise, it will return 2764/// false. Either way, the type @p R will be updated to reflect a 2765/// well-formed type for the conversion operator. 2766void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2767 FunctionDecl::StorageClass& SC) { 2768 // C++ [class.conv.fct]p1: 2769 // Neither parameter types nor return type can be specified. The 2770 // type of a conversion function (8.3.5) is "function taking no 2771 // parameter returning conversion-type-id." 2772 if (SC == FunctionDecl::Static) { 2773 if (!D.isInvalidType()) 2774 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2775 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2776 << SourceRange(D.getIdentifierLoc()); 2777 D.setInvalidType(); 2778 SC = FunctionDecl::None; 2779 } 2780 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2781 // Conversion functions don't have return types, but the parser will 2782 // happily parse something like: 2783 // 2784 // class X { 2785 // float operator bool(); 2786 // }; 2787 // 2788 // The return type will be changed later anyway. 2789 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2790 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2791 << SourceRange(D.getIdentifierLoc()); 2792 } 2793 2794 // Make sure we don't have any parameters. 2795 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2796 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2797 2798 // Delete the parameters. 2799 D.getTypeObject(0).Fun.freeArgs(); 2800 D.setInvalidType(); 2801 } 2802 2803 // Make sure the conversion function isn't variadic. 2804 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2805 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2806 D.setInvalidType(); 2807 } 2808 2809 // C++ [class.conv.fct]p4: 2810 // The conversion-type-id shall not represent a function type nor 2811 // an array type. 2812 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2813 if (ConvType->isArrayType()) { 2814 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2815 ConvType = Context.getPointerType(ConvType); 2816 D.setInvalidType(); 2817 } else if (ConvType->isFunctionType()) { 2818 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2819 ConvType = Context.getPointerType(ConvType); 2820 D.setInvalidType(); 2821 } 2822 2823 // Rebuild the function type "R" without any parameters (in case any 2824 // of the errors above fired) and with the conversion type as the 2825 // return type. 2826 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2827 R = Context.getFunctionType(ConvType, 0, 0, false, 2828 Proto->getTypeQuals(), 2829 Proto->hasExceptionSpec(), 2830 Proto->hasAnyExceptionSpec(), 2831 Proto->getNumExceptions(), 2832 Proto->exception_begin(), 2833 Proto->getExtInfo()); 2834 2835 // C++0x explicit conversion operators. 2836 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2837 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2838 diag::warn_explicit_conversion_functions) 2839 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2840} 2841 2842/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2843/// the declaration of the given C++ conversion function. This routine 2844/// is responsible for recording the conversion function in the C++ 2845/// class, if possible. 2846Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2847 assert(Conversion && "Expected to receive a conversion function declaration"); 2848 2849 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2850 2851 // Make sure we aren't redeclaring the conversion function. 2852 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2853 2854 // C++ [class.conv.fct]p1: 2855 // [...] A conversion function is never used to convert a 2856 // (possibly cv-qualified) object to the (possibly cv-qualified) 2857 // same object type (or a reference to it), to a (possibly 2858 // cv-qualified) base class of that type (or a reference to it), 2859 // or to (possibly cv-qualified) void. 2860 // FIXME: Suppress this warning if the conversion function ends up being a 2861 // virtual function that overrides a virtual function in a base class. 2862 QualType ClassType 2863 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2864 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2865 ConvType = ConvTypeRef->getPointeeType(); 2866 if (ConvType->isRecordType()) { 2867 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2868 if (ConvType == ClassType) 2869 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2870 << ClassType; 2871 else if (IsDerivedFrom(ClassType, ConvType)) 2872 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2873 << ClassType << ConvType; 2874 } else if (ConvType->isVoidType()) { 2875 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2876 << ClassType << ConvType; 2877 } 2878 2879 if (Conversion->getPrimaryTemplate()) { 2880 // ignore specializations 2881 } else if (Conversion->getPreviousDeclaration()) { 2882 if (FunctionTemplateDecl *ConversionTemplate 2883 = Conversion->getDescribedFunctionTemplate()) { 2884 if (ClassDecl->replaceConversion( 2885 ConversionTemplate->getPreviousDeclaration(), 2886 ConversionTemplate)) 2887 return DeclPtrTy::make(ConversionTemplate); 2888 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2889 Conversion)) 2890 return DeclPtrTy::make(Conversion); 2891 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2892 } else if (FunctionTemplateDecl *ConversionTemplate 2893 = Conversion->getDescribedFunctionTemplate()) 2894 ClassDecl->addConversionFunction(ConversionTemplate); 2895 else 2896 ClassDecl->addConversionFunction(Conversion); 2897 2898 return DeclPtrTy::make(Conversion); 2899} 2900 2901//===----------------------------------------------------------------------===// 2902// Namespace Handling 2903//===----------------------------------------------------------------------===// 2904 2905/// ActOnStartNamespaceDef - This is called at the start of a namespace 2906/// definition. 2907Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2908 SourceLocation IdentLoc, 2909 IdentifierInfo *II, 2910 SourceLocation LBrace, 2911 AttributeList *AttrList) { 2912 NamespaceDecl *Namespc = 2913 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2914 Namespc->setLBracLoc(LBrace); 2915 2916 Scope *DeclRegionScope = NamespcScope->getParent(); 2917 2918 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2919 2920 if (II) { 2921 // C++ [namespace.def]p2: 2922 // The identifier in an original-namespace-definition shall not have been 2923 // previously defined in the declarative region in which the 2924 // original-namespace-definition appears. The identifier in an 2925 // original-namespace-definition is the name of the namespace. Subsequently 2926 // in that declarative region, it is treated as an original-namespace-name. 2927 2928 NamedDecl *PrevDecl 2929 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2930 ForRedeclaration); 2931 2932 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2933 // This is an extended namespace definition. 2934 // Attach this namespace decl to the chain of extended namespace 2935 // definitions. 2936 OrigNS->setNextNamespace(Namespc); 2937 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2938 2939 // Remove the previous declaration from the scope. 2940 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2941 IdResolver.RemoveDecl(OrigNS); 2942 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2943 } 2944 } else if (PrevDecl) { 2945 // This is an invalid name redefinition. 2946 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2947 << Namespc->getDeclName(); 2948 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2949 Namespc->setInvalidDecl(); 2950 // Continue on to push Namespc as current DeclContext and return it. 2951 } else if (II->isStr("std") && 2952 CurContext->getLookupContext()->isTranslationUnit()) { 2953 // This is the first "real" definition of the namespace "std", so update 2954 // our cache of the "std" namespace to point at this definition. 2955 if (StdNamespace) { 2956 // We had already defined a dummy namespace "std". Link this new 2957 // namespace definition to the dummy namespace "std". 2958 StdNamespace->setNextNamespace(Namespc); 2959 StdNamespace->setLocation(IdentLoc); 2960 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2961 } 2962 2963 // Make our StdNamespace cache point at the first real definition of the 2964 // "std" namespace. 2965 StdNamespace = Namespc; 2966 } 2967 2968 PushOnScopeChains(Namespc, DeclRegionScope); 2969 } else { 2970 // Anonymous namespaces. 2971 assert(Namespc->isAnonymousNamespace()); 2972 2973 // Link the anonymous namespace into its parent. 2974 NamespaceDecl *PrevDecl; 2975 DeclContext *Parent = CurContext->getLookupContext(); 2976 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2977 PrevDecl = TU->getAnonymousNamespace(); 2978 TU->setAnonymousNamespace(Namespc); 2979 } else { 2980 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2981 PrevDecl = ND->getAnonymousNamespace(); 2982 ND->setAnonymousNamespace(Namespc); 2983 } 2984 2985 // Link the anonymous namespace with its previous declaration. 2986 if (PrevDecl) { 2987 assert(PrevDecl->isAnonymousNamespace()); 2988 assert(!PrevDecl->getNextNamespace()); 2989 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2990 PrevDecl->setNextNamespace(Namespc); 2991 } 2992 2993 CurContext->addDecl(Namespc); 2994 2995 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2996 // behaves as if it were replaced by 2997 // namespace unique { /* empty body */ } 2998 // using namespace unique; 2999 // namespace unique { namespace-body } 3000 // where all occurrences of 'unique' in a translation unit are 3001 // replaced by the same identifier and this identifier differs 3002 // from all other identifiers in the entire program. 3003 3004 // We just create the namespace with an empty name and then add an 3005 // implicit using declaration, just like the standard suggests. 3006 // 3007 // CodeGen enforces the "universally unique" aspect by giving all 3008 // declarations semantically contained within an anonymous 3009 // namespace internal linkage. 3010 3011 if (!PrevDecl) { 3012 UsingDirectiveDecl* UD 3013 = UsingDirectiveDecl::Create(Context, CurContext, 3014 /* 'using' */ LBrace, 3015 /* 'namespace' */ SourceLocation(), 3016 /* qualifier */ SourceRange(), 3017 /* NNS */ NULL, 3018 /* identifier */ SourceLocation(), 3019 Namespc, 3020 /* Ancestor */ CurContext); 3021 UD->setImplicit(); 3022 CurContext->addDecl(UD); 3023 } 3024 } 3025 3026 // Although we could have an invalid decl (i.e. the namespace name is a 3027 // redefinition), push it as current DeclContext and try to continue parsing. 3028 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3029 // for the namespace has the declarations that showed up in that particular 3030 // namespace definition. 3031 PushDeclContext(NamespcScope, Namespc); 3032 return DeclPtrTy::make(Namespc); 3033} 3034 3035/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3036/// is a namespace alias, returns the namespace it points to. 3037static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3038 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3039 return AD->getNamespace(); 3040 return dyn_cast_or_null<NamespaceDecl>(D); 3041} 3042 3043/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3044/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3045void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3046 Decl *Dcl = D.getAs<Decl>(); 3047 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3048 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3049 Namespc->setRBracLoc(RBrace); 3050 PopDeclContext(); 3051} 3052 3053Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3054 SourceLocation UsingLoc, 3055 SourceLocation NamespcLoc, 3056 const CXXScopeSpec &SS, 3057 SourceLocation IdentLoc, 3058 IdentifierInfo *NamespcName, 3059 AttributeList *AttrList) { 3060 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3061 assert(NamespcName && "Invalid NamespcName."); 3062 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3063 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3064 3065 UsingDirectiveDecl *UDir = 0; 3066 3067 // Lookup namespace name. 3068 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3069 LookupParsedName(R, S, &SS); 3070 if (R.isAmbiguous()) 3071 return DeclPtrTy(); 3072 3073 if (!R.empty()) { 3074 NamedDecl *Named = R.getFoundDecl(); 3075 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3076 && "expected namespace decl"); 3077 // C++ [namespace.udir]p1: 3078 // A using-directive specifies that the names in the nominated 3079 // namespace can be used in the scope in which the 3080 // using-directive appears after the using-directive. During 3081 // unqualified name lookup (3.4.1), the names appear as if they 3082 // were declared in the nearest enclosing namespace which 3083 // contains both the using-directive and the nominated 3084 // namespace. [Note: in this context, "contains" means "contains 3085 // directly or indirectly". ] 3086 3087 // Find enclosing context containing both using-directive and 3088 // nominated namespace. 3089 NamespaceDecl *NS = getNamespaceDecl(Named); 3090 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3091 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3092 CommonAncestor = CommonAncestor->getParent(); 3093 3094 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3095 SS.getRange(), 3096 (NestedNameSpecifier *)SS.getScopeRep(), 3097 IdentLoc, Named, CommonAncestor); 3098 PushUsingDirective(S, UDir); 3099 } else { 3100 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3101 } 3102 3103 // FIXME: We ignore attributes for now. 3104 delete AttrList; 3105 return DeclPtrTy::make(UDir); 3106} 3107 3108void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3109 // If scope has associated entity, then using directive is at namespace 3110 // or translation unit scope. We add UsingDirectiveDecls, into 3111 // it's lookup structure. 3112 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3113 Ctx->addDecl(UDir); 3114 else 3115 // Otherwise it is block-sope. using-directives will affect lookup 3116 // only to the end of scope. 3117 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3118} 3119 3120 3121Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3122 AccessSpecifier AS, 3123 bool HasUsingKeyword, 3124 SourceLocation UsingLoc, 3125 const CXXScopeSpec &SS, 3126 UnqualifiedId &Name, 3127 AttributeList *AttrList, 3128 bool IsTypeName, 3129 SourceLocation TypenameLoc) { 3130 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3131 3132 switch (Name.getKind()) { 3133 case UnqualifiedId::IK_Identifier: 3134 case UnqualifiedId::IK_OperatorFunctionId: 3135 case UnqualifiedId::IK_LiteralOperatorId: 3136 case UnqualifiedId::IK_ConversionFunctionId: 3137 break; 3138 3139 case UnqualifiedId::IK_ConstructorName: 3140 case UnqualifiedId::IK_ConstructorTemplateId: 3141 // C++0x inherited constructors. 3142 if (getLangOptions().CPlusPlus0x) break; 3143 3144 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3145 << SS.getRange(); 3146 return DeclPtrTy(); 3147 3148 case UnqualifiedId::IK_DestructorName: 3149 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3150 << SS.getRange(); 3151 return DeclPtrTy(); 3152 3153 case UnqualifiedId::IK_TemplateId: 3154 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3155 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3156 return DeclPtrTy(); 3157 } 3158 3159 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3160 if (!TargetName) 3161 return DeclPtrTy(); 3162 3163 // Warn about using declarations. 3164 // TODO: store that the declaration was written without 'using' and 3165 // talk about access decls instead of using decls in the 3166 // diagnostics. 3167 if (!HasUsingKeyword) { 3168 UsingLoc = Name.getSourceRange().getBegin(); 3169 3170 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3171 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3172 } 3173 3174 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3175 Name.getSourceRange().getBegin(), 3176 TargetName, AttrList, 3177 /* IsInstantiation */ false, 3178 IsTypeName, TypenameLoc); 3179 if (UD) 3180 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3181 3182 return DeclPtrTy::make(UD); 3183} 3184 3185/// Determines whether to create a using shadow decl for a particular 3186/// decl, given the set of decls existing prior to this using lookup. 3187bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3188 const LookupResult &Previous) { 3189 // Diagnose finding a decl which is not from a base class of the 3190 // current class. We do this now because there are cases where this 3191 // function will silently decide not to build a shadow decl, which 3192 // will pre-empt further diagnostics. 3193 // 3194 // We don't need to do this in C++0x because we do the check once on 3195 // the qualifier. 3196 // 3197 // FIXME: diagnose the following if we care enough: 3198 // struct A { int foo; }; 3199 // struct B : A { using A::foo; }; 3200 // template <class T> struct C : A {}; 3201 // template <class T> struct D : C<T> { using B::foo; } // <--- 3202 // This is invalid (during instantiation) in C++03 because B::foo 3203 // resolves to the using decl in B, which is not a base class of D<T>. 3204 // We can't diagnose it immediately because C<T> is an unknown 3205 // specialization. The UsingShadowDecl in D<T> then points directly 3206 // to A::foo, which will look well-formed when we instantiate. 3207 // The right solution is to not collapse the shadow-decl chain. 3208 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3209 DeclContext *OrigDC = Orig->getDeclContext(); 3210 3211 // Handle enums and anonymous structs. 3212 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3213 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3214 while (OrigRec->isAnonymousStructOrUnion()) 3215 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3216 3217 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3218 if (OrigDC == CurContext) { 3219 Diag(Using->getLocation(), 3220 diag::err_using_decl_nested_name_specifier_is_current_class) 3221 << Using->getNestedNameRange(); 3222 Diag(Orig->getLocation(), diag::note_using_decl_target); 3223 return true; 3224 } 3225 3226 Diag(Using->getNestedNameRange().getBegin(), 3227 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3228 << Using->getTargetNestedNameDecl() 3229 << cast<CXXRecordDecl>(CurContext) 3230 << Using->getNestedNameRange(); 3231 Diag(Orig->getLocation(), diag::note_using_decl_target); 3232 return true; 3233 } 3234 } 3235 3236 if (Previous.empty()) return false; 3237 3238 NamedDecl *Target = Orig; 3239 if (isa<UsingShadowDecl>(Target)) 3240 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3241 3242 // If the target happens to be one of the previous declarations, we 3243 // don't have a conflict. 3244 // 3245 // FIXME: but we might be increasing its access, in which case we 3246 // should redeclare it. 3247 NamedDecl *NonTag = 0, *Tag = 0; 3248 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3249 I != E; ++I) { 3250 NamedDecl *D = (*I)->getUnderlyingDecl(); 3251 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3252 return false; 3253 3254 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3255 } 3256 3257 if (Target->isFunctionOrFunctionTemplate()) { 3258 FunctionDecl *FD; 3259 if (isa<FunctionTemplateDecl>(Target)) 3260 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3261 else 3262 FD = cast<FunctionDecl>(Target); 3263 3264 NamedDecl *OldDecl = 0; 3265 switch (CheckOverload(FD, Previous, OldDecl)) { 3266 case Ovl_Overload: 3267 return false; 3268 3269 case Ovl_NonFunction: 3270 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3271 break; 3272 3273 // We found a decl with the exact signature. 3274 case Ovl_Match: 3275 if (isa<UsingShadowDecl>(OldDecl)) { 3276 // Silently ignore the possible conflict. 3277 return false; 3278 } 3279 3280 // If we're in a record, we want to hide the target, so we 3281 // return true (without a diagnostic) to tell the caller not to 3282 // build a shadow decl. 3283 if (CurContext->isRecord()) 3284 return true; 3285 3286 // If we're not in a record, this is an error. 3287 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3288 break; 3289 } 3290 3291 Diag(Target->getLocation(), diag::note_using_decl_target); 3292 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3293 return true; 3294 } 3295 3296 // Target is not a function. 3297 3298 if (isa<TagDecl>(Target)) { 3299 // No conflict between a tag and a non-tag. 3300 if (!Tag) return false; 3301 3302 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3303 Diag(Target->getLocation(), diag::note_using_decl_target); 3304 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3305 return true; 3306 } 3307 3308 // No conflict between a tag and a non-tag. 3309 if (!NonTag) return false; 3310 3311 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3312 Diag(Target->getLocation(), diag::note_using_decl_target); 3313 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3314 return true; 3315} 3316 3317/// Builds a shadow declaration corresponding to a 'using' declaration. 3318UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3319 UsingDecl *UD, 3320 NamedDecl *Orig) { 3321 3322 // If we resolved to another shadow declaration, just coalesce them. 3323 NamedDecl *Target = Orig; 3324 if (isa<UsingShadowDecl>(Target)) { 3325 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3326 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3327 } 3328 3329 UsingShadowDecl *Shadow 3330 = UsingShadowDecl::Create(Context, CurContext, 3331 UD->getLocation(), UD, Target); 3332 UD->addShadowDecl(Shadow); 3333 3334 if (S) 3335 PushOnScopeChains(Shadow, S); 3336 else 3337 CurContext->addDecl(Shadow); 3338 Shadow->setAccess(UD->getAccess()); 3339 3340 // Register it as a conversion if appropriate. 3341 if (Shadow->getDeclName().getNameKind() 3342 == DeclarationName::CXXConversionFunctionName) 3343 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3344 3345 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3346 Shadow->setInvalidDecl(); 3347 3348 return Shadow; 3349} 3350 3351/// Hides a using shadow declaration. This is required by the current 3352/// using-decl implementation when a resolvable using declaration in a 3353/// class is followed by a declaration which would hide or override 3354/// one or more of the using decl's targets; for example: 3355/// 3356/// struct Base { void foo(int); }; 3357/// struct Derived : Base { 3358/// using Base::foo; 3359/// void foo(int); 3360/// }; 3361/// 3362/// The governing language is C++03 [namespace.udecl]p12: 3363/// 3364/// When a using-declaration brings names from a base class into a 3365/// derived class scope, member functions in the derived class 3366/// override and/or hide member functions with the same name and 3367/// parameter types in a base class (rather than conflicting). 3368/// 3369/// There are two ways to implement this: 3370/// (1) optimistically create shadow decls when they're not hidden 3371/// by existing declarations, or 3372/// (2) don't create any shadow decls (or at least don't make them 3373/// visible) until we've fully parsed/instantiated the class. 3374/// The problem with (1) is that we might have to retroactively remove 3375/// a shadow decl, which requires several O(n) operations because the 3376/// decl structures are (very reasonably) not designed for removal. 3377/// (2) avoids this but is very fiddly and phase-dependent. 3378void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3379 if (Shadow->getDeclName().getNameKind() == 3380 DeclarationName::CXXConversionFunctionName) 3381 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3382 3383 // Remove it from the DeclContext... 3384 Shadow->getDeclContext()->removeDecl(Shadow); 3385 3386 // ...and the scope, if applicable... 3387 if (S) { 3388 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3389 IdResolver.RemoveDecl(Shadow); 3390 } 3391 3392 // ...and the using decl. 3393 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3394 3395 // TODO: complain somehow if Shadow was used. It shouldn't 3396 // be possible for this to happen, because...? 3397} 3398 3399/// Builds a using declaration. 3400/// 3401/// \param IsInstantiation - Whether this call arises from an 3402/// instantiation of an unresolved using declaration. We treat 3403/// the lookup differently for these declarations. 3404NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3405 SourceLocation UsingLoc, 3406 const CXXScopeSpec &SS, 3407 SourceLocation IdentLoc, 3408 DeclarationName Name, 3409 AttributeList *AttrList, 3410 bool IsInstantiation, 3411 bool IsTypeName, 3412 SourceLocation TypenameLoc) { 3413 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3414 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3415 3416 // FIXME: We ignore attributes for now. 3417 delete AttrList; 3418 3419 if (SS.isEmpty()) { 3420 Diag(IdentLoc, diag::err_using_requires_qualname); 3421 return 0; 3422 } 3423 3424 // Do the redeclaration lookup in the current scope. 3425 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3426 ForRedeclaration); 3427 Previous.setHideTags(false); 3428 if (S) { 3429 LookupName(Previous, S); 3430 3431 // It is really dumb that we have to do this. 3432 LookupResult::Filter F = Previous.makeFilter(); 3433 while (F.hasNext()) { 3434 NamedDecl *D = F.next(); 3435 if (!isDeclInScope(D, CurContext, S)) 3436 F.erase(); 3437 } 3438 F.done(); 3439 } else { 3440 assert(IsInstantiation && "no scope in non-instantiation"); 3441 assert(CurContext->isRecord() && "scope not record in instantiation"); 3442 LookupQualifiedName(Previous, CurContext); 3443 } 3444 3445 NestedNameSpecifier *NNS = 3446 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3447 3448 // Check for invalid redeclarations. 3449 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3450 return 0; 3451 3452 // Check for bad qualifiers. 3453 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3454 return 0; 3455 3456 DeclContext *LookupContext = computeDeclContext(SS); 3457 NamedDecl *D; 3458 if (!LookupContext) { 3459 if (IsTypeName) { 3460 // FIXME: not all declaration name kinds are legal here 3461 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3462 UsingLoc, TypenameLoc, 3463 SS.getRange(), NNS, 3464 IdentLoc, Name); 3465 } else { 3466 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3467 UsingLoc, SS.getRange(), NNS, 3468 IdentLoc, Name); 3469 } 3470 } else { 3471 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3472 SS.getRange(), UsingLoc, NNS, Name, 3473 IsTypeName); 3474 } 3475 D->setAccess(AS); 3476 CurContext->addDecl(D); 3477 3478 if (!LookupContext) return D; 3479 UsingDecl *UD = cast<UsingDecl>(D); 3480 3481 if (RequireCompleteDeclContext(SS)) { 3482 UD->setInvalidDecl(); 3483 return UD; 3484 } 3485 3486 // Look up the target name. 3487 3488 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3489 3490 // Unlike most lookups, we don't always want to hide tag 3491 // declarations: tag names are visible through the using declaration 3492 // even if hidden by ordinary names, *except* in a dependent context 3493 // where it's important for the sanity of two-phase lookup. 3494 if (!IsInstantiation) 3495 R.setHideTags(false); 3496 3497 LookupQualifiedName(R, LookupContext); 3498 3499 if (R.empty()) { 3500 Diag(IdentLoc, diag::err_no_member) 3501 << Name << LookupContext << SS.getRange(); 3502 UD->setInvalidDecl(); 3503 return UD; 3504 } 3505 3506 if (R.isAmbiguous()) { 3507 UD->setInvalidDecl(); 3508 return UD; 3509 } 3510 3511 if (IsTypeName) { 3512 // If we asked for a typename and got a non-type decl, error out. 3513 if (!R.getAsSingle<TypeDecl>()) { 3514 Diag(IdentLoc, diag::err_using_typename_non_type); 3515 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3516 Diag((*I)->getUnderlyingDecl()->getLocation(), 3517 diag::note_using_decl_target); 3518 UD->setInvalidDecl(); 3519 return UD; 3520 } 3521 } else { 3522 // If we asked for a non-typename and we got a type, error out, 3523 // but only if this is an instantiation of an unresolved using 3524 // decl. Otherwise just silently find the type name. 3525 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3526 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3527 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3528 UD->setInvalidDecl(); 3529 return UD; 3530 } 3531 } 3532 3533 // C++0x N2914 [namespace.udecl]p6: 3534 // A using-declaration shall not name a namespace. 3535 if (R.getAsSingle<NamespaceDecl>()) { 3536 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3537 << SS.getRange(); 3538 UD->setInvalidDecl(); 3539 return UD; 3540 } 3541 3542 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3543 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3544 BuildUsingShadowDecl(S, UD, *I); 3545 } 3546 3547 return UD; 3548} 3549 3550/// Checks that the given using declaration is not an invalid 3551/// redeclaration. Note that this is checking only for the using decl 3552/// itself, not for any ill-formedness among the UsingShadowDecls. 3553bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3554 bool isTypeName, 3555 const CXXScopeSpec &SS, 3556 SourceLocation NameLoc, 3557 const LookupResult &Prev) { 3558 // C++03 [namespace.udecl]p8: 3559 // C++0x [namespace.udecl]p10: 3560 // A using-declaration is a declaration and can therefore be used 3561 // repeatedly where (and only where) multiple declarations are 3562 // allowed. 3563 // That's only in file contexts. 3564 if (CurContext->getLookupContext()->isFileContext()) 3565 return false; 3566 3567 NestedNameSpecifier *Qual 3568 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3569 3570 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3571 NamedDecl *D = *I; 3572 3573 bool DTypename; 3574 NestedNameSpecifier *DQual; 3575 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3576 DTypename = UD->isTypeName(); 3577 DQual = UD->getTargetNestedNameDecl(); 3578 } else if (UnresolvedUsingValueDecl *UD 3579 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3580 DTypename = false; 3581 DQual = UD->getTargetNestedNameSpecifier(); 3582 } else if (UnresolvedUsingTypenameDecl *UD 3583 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3584 DTypename = true; 3585 DQual = UD->getTargetNestedNameSpecifier(); 3586 } else continue; 3587 3588 // using decls differ if one says 'typename' and the other doesn't. 3589 // FIXME: non-dependent using decls? 3590 if (isTypeName != DTypename) continue; 3591 3592 // using decls differ if they name different scopes (but note that 3593 // template instantiation can cause this check to trigger when it 3594 // didn't before instantiation). 3595 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3596 Context.getCanonicalNestedNameSpecifier(DQual)) 3597 continue; 3598 3599 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3600 Diag(D->getLocation(), diag::note_using_decl) << 1; 3601 return true; 3602 } 3603 3604 return false; 3605} 3606 3607 3608/// Checks that the given nested-name qualifier used in a using decl 3609/// in the current context is appropriately related to the current 3610/// scope. If an error is found, diagnoses it and returns true. 3611bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3612 const CXXScopeSpec &SS, 3613 SourceLocation NameLoc) { 3614 DeclContext *NamedContext = computeDeclContext(SS); 3615 3616 if (!CurContext->isRecord()) { 3617 // C++03 [namespace.udecl]p3: 3618 // C++0x [namespace.udecl]p8: 3619 // A using-declaration for a class member shall be a member-declaration. 3620 3621 // If we weren't able to compute a valid scope, it must be a 3622 // dependent class scope. 3623 if (!NamedContext || NamedContext->isRecord()) { 3624 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3625 << SS.getRange(); 3626 return true; 3627 } 3628 3629 // Otherwise, everything is known to be fine. 3630 return false; 3631 } 3632 3633 // The current scope is a record. 3634 3635 // If the named context is dependent, we can't decide much. 3636 if (!NamedContext) { 3637 // FIXME: in C++0x, we can diagnose if we can prove that the 3638 // nested-name-specifier does not refer to a base class, which is 3639 // still possible in some cases. 3640 3641 // Otherwise we have to conservatively report that things might be 3642 // okay. 3643 return false; 3644 } 3645 3646 if (!NamedContext->isRecord()) { 3647 // Ideally this would point at the last name in the specifier, 3648 // but we don't have that level of source info. 3649 Diag(SS.getRange().getBegin(), 3650 diag::err_using_decl_nested_name_specifier_is_not_class) 3651 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3652 return true; 3653 } 3654 3655 if (getLangOptions().CPlusPlus0x) { 3656 // C++0x [namespace.udecl]p3: 3657 // In a using-declaration used as a member-declaration, the 3658 // nested-name-specifier shall name a base class of the class 3659 // being defined. 3660 3661 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3662 cast<CXXRecordDecl>(NamedContext))) { 3663 if (CurContext == NamedContext) { 3664 Diag(NameLoc, 3665 diag::err_using_decl_nested_name_specifier_is_current_class) 3666 << SS.getRange(); 3667 return true; 3668 } 3669 3670 Diag(SS.getRange().getBegin(), 3671 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3672 << (NestedNameSpecifier*) SS.getScopeRep() 3673 << cast<CXXRecordDecl>(CurContext) 3674 << SS.getRange(); 3675 return true; 3676 } 3677 3678 return false; 3679 } 3680 3681 // C++03 [namespace.udecl]p4: 3682 // A using-declaration used as a member-declaration shall refer 3683 // to a member of a base class of the class being defined [etc.]. 3684 3685 // Salient point: SS doesn't have to name a base class as long as 3686 // lookup only finds members from base classes. Therefore we can 3687 // diagnose here only if we can prove that that can't happen, 3688 // i.e. if the class hierarchies provably don't intersect. 3689 3690 // TODO: it would be nice if "definitely valid" results were cached 3691 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3692 // need to be repeated. 3693 3694 struct UserData { 3695 llvm::DenseSet<const CXXRecordDecl*> Bases; 3696 3697 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3698 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3699 Data->Bases.insert(Base); 3700 return true; 3701 } 3702 3703 bool hasDependentBases(const CXXRecordDecl *Class) { 3704 return !Class->forallBases(collect, this); 3705 } 3706 3707 /// Returns true if the base is dependent or is one of the 3708 /// accumulated base classes. 3709 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3710 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3711 return !Data->Bases.count(Base); 3712 } 3713 3714 bool mightShareBases(const CXXRecordDecl *Class) { 3715 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3716 } 3717 }; 3718 3719 UserData Data; 3720 3721 // Returns false if we find a dependent base. 3722 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3723 return false; 3724 3725 // Returns false if the class has a dependent base or if it or one 3726 // of its bases is present in the base set of the current context. 3727 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3728 return false; 3729 3730 Diag(SS.getRange().getBegin(), 3731 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3732 << (NestedNameSpecifier*) SS.getScopeRep() 3733 << cast<CXXRecordDecl>(CurContext) 3734 << SS.getRange(); 3735 3736 return true; 3737} 3738 3739Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3740 SourceLocation NamespaceLoc, 3741 SourceLocation AliasLoc, 3742 IdentifierInfo *Alias, 3743 const CXXScopeSpec &SS, 3744 SourceLocation IdentLoc, 3745 IdentifierInfo *Ident) { 3746 3747 // Lookup the namespace name. 3748 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3749 LookupParsedName(R, S, &SS); 3750 3751 // Check if we have a previous declaration with the same name. 3752 if (NamedDecl *PrevDecl 3753 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3754 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3755 // We already have an alias with the same name that points to the same 3756 // namespace, so don't create a new one. 3757 // FIXME: At some point, we'll want to create the (redundant) 3758 // declaration to maintain better source information. 3759 if (!R.isAmbiguous() && !R.empty() && 3760 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3761 return DeclPtrTy(); 3762 } 3763 3764 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3765 diag::err_redefinition_different_kind; 3766 Diag(AliasLoc, DiagID) << Alias; 3767 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3768 return DeclPtrTy(); 3769 } 3770 3771 if (R.isAmbiguous()) 3772 return DeclPtrTy(); 3773 3774 if (R.empty()) { 3775 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3776 return DeclPtrTy(); 3777 } 3778 3779 NamespaceAliasDecl *AliasDecl = 3780 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3781 Alias, SS.getRange(), 3782 (NestedNameSpecifier *)SS.getScopeRep(), 3783 IdentLoc, R.getFoundDecl()); 3784 3785 PushOnScopeChains(AliasDecl, S); 3786 return DeclPtrTy::make(AliasDecl); 3787} 3788 3789void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3790 CXXConstructorDecl *Constructor) { 3791 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3792 !Constructor->isUsed()) && 3793 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3794 3795 CXXRecordDecl *ClassDecl 3796 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3797 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3798 3799 DeclContext *PreviousContext = CurContext; 3800 CurContext = Constructor; 3801 if (SetBaseOrMemberInitializers(Constructor, 0, 0, 3802 /*IsImplicitConstructor=*/true, 3803 /*AnyErrors=*/false)) { 3804 Diag(CurrentLocation, diag::note_member_synthesized_at) 3805 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3806 Constructor->setInvalidDecl(); 3807 } else { 3808 Constructor->setUsed(); 3809 } 3810 CurContext = PreviousContext; 3811} 3812 3813void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3814 CXXDestructorDecl *Destructor) { 3815 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3816 "DefineImplicitDestructor - call it for implicit default dtor"); 3817 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3818 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3819 3820 DeclContext *PreviousContext = CurContext; 3821 CurContext = Destructor; 3822 3823 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3824 Destructor->getParent()); 3825 3826 // FIXME: If CheckDestructor fails, we should emit a note about where the 3827 // implicit destructor was needed. 3828 if (CheckDestructor(Destructor)) { 3829 Diag(CurrentLocation, diag::note_member_synthesized_at) 3830 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3831 3832 Destructor->setInvalidDecl(); 3833 CurContext = PreviousContext; 3834 3835 return; 3836 } 3837 CurContext = PreviousContext; 3838 3839 Destructor->setUsed(); 3840} 3841 3842void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3843 CXXMethodDecl *MethodDecl) { 3844 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3845 MethodDecl->getOverloadedOperator() == OO_Equal && 3846 !MethodDecl->isUsed()) && 3847 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3848 3849 CXXRecordDecl *ClassDecl 3850 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3851 3852 DeclContext *PreviousContext = CurContext; 3853 CurContext = MethodDecl; 3854 3855 // C++[class.copy] p12 3856 // Before the implicitly-declared copy assignment operator for a class is 3857 // implicitly defined, all implicitly-declared copy assignment operators 3858 // for its direct base classes and its nonstatic data members shall have 3859 // been implicitly defined. 3860 bool err = false; 3861 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3862 E = ClassDecl->bases_end(); Base != E; ++Base) { 3863 CXXRecordDecl *BaseClassDecl 3864 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3865 if (CXXMethodDecl *BaseAssignOpMethod = 3866 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3867 BaseClassDecl)) { 3868 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3869 BaseAssignOpMethod, 3870 PDiag(diag::err_access_assign_base) 3871 << Base->getType()); 3872 3873 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3874 } 3875 } 3876 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3877 E = ClassDecl->field_end(); Field != E; ++Field) { 3878 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3879 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3880 FieldType = Array->getElementType(); 3881 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3882 CXXRecordDecl *FieldClassDecl 3883 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3884 if (CXXMethodDecl *FieldAssignOpMethod = 3885 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3886 FieldClassDecl)) { 3887 CheckDirectMemberAccess(Field->getLocation(), 3888 FieldAssignOpMethod, 3889 PDiag(diag::err_access_assign_field) 3890 << Field->getDeclName() << Field->getType()); 3891 3892 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3893 } 3894 } else if (FieldType->isReferenceType()) { 3895 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3896 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3897 Diag(Field->getLocation(), diag::note_declared_at); 3898 Diag(CurrentLocation, diag::note_first_required_here); 3899 err = true; 3900 } else if (FieldType.isConstQualified()) { 3901 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3902 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3903 Diag(Field->getLocation(), diag::note_declared_at); 3904 Diag(CurrentLocation, diag::note_first_required_here); 3905 err = true; 3906 } 3907 } 3908 if (!err) 3909 MethodDecl->setUsed(); 3910 3911 CurContext = PreviousContext; 3912} 3913 3914CXXMethodDecl * 3915Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3916 ParmVarDecl *ParmDecl, 3917 CXXRecordDecl *ClassDecl) { 3918 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3919 QualType RHSType(LHSType); 3920 // If class's assignment operator argument is const/volatile qualified, 3921 // look for operator = (const/volatile B&). Otherwise, look for 3922 // operator = (B&). 3923 RHSType = Context.getCVRQualifiedType(RHSType, 3924 ParmDecl->getType().getCVRQualifiers()); 3925 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3926 LHSType, 3927 SourceLocation())); 3928 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3929 RHSType, 3930 CurrentLocation)); 3931 Expr *Args[2] = { &*LHS, &*RHS }; 3932 OverloadCandidateSet CandidateSet(CurrentLocation); 3933 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3934 CandidateSet); 3935 OverloadCandidateSet::iterator Best; 3936 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3937 return cast<CXXMethodDecl>(Best->Function); 3938 assert(false && 3939 "getAssignOperatorMethod - copy assignment operator method not found"); 3940 return 0; 3941} 3942 3943void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3944 CXXConstructorDecl *CopyConstructor, 3945 unsigned TypeQuals) { 3946 assert((CopyConstructor->isImplicit() && 3947 CopyConstructor->isCopyConstructor(TypeQuals) && 3948 !CopyConstructor->isUsed()) && 3949 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3950 3951 CXXRecordDecl *ClassDecl 3952 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3953 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3954 3955 DeclContext *PreviousContext = CurContext; 3956 CurContext = CopyConstructor; 3957 3958 // C++ [class.copy] p209 3959 // Before the implicitly-declared copy constructor for a class is 3960 // implicitly defined, all the implicitly-declared copy constructors 3961 // for its base class and its non-static data members shall have been 3962 // implicitly defined. 3963 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3964 Base != ClassDecl->bases_end(); ++Base) { 3965 CXXRecordDecl *BaseClassDecl 3966 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3967 if (CXXConstructorDecl *BaseCopyCtor = 3968 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3969 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3970 BaseCopyCtor, 3971 PDiag(diag::err_access_copy_base) 3972 << Base->getType()); 3973 3974 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3975 } 3976 } 3977 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3978 FieldEnd = ClassDecl->field_end(); 3979 Field != FieldEnd; ++Field) { 3980 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3981 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3982 FieldType = Array->getElementType(); 3983 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3984 CXXRecordDecl *FieldClassDecl 3985 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3986 if (CXXConstructorDecl *FieldCopyCtor = 3987 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 3988 CheckDirectMemberAccess(Field->getLocation(), 3989 FieldCopyCtor, 3990 PDiag(diag::err_access_copy_field) 3991 << Field->getDeclName() << Field->getType()); 3992 3993 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3994 } 3995 } 3996 } 3997 CopyConstructor->setUsed(); 3998 3999 CurContext = PreviousContext; 4000} 4001 4002Sema::OwningExprResult 4003Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4004 CXXConstructorDecl *Constructor, 4005 MultiExprArg ExprArgs, 4006 bool RequiresZeroInit, 4007 bool BaseInitialization) { 4008 bool Elidable = false; 4009 4010 // C++ [class.copy]p15: 4011 // Whenever a temporary class object is copied using a copy constructor, and 4012 // this object and the copy have the same cv-unqualified type, an 4013 // implementation is permitted to treat the original and the copy as two 4014 // different ways of referring to the same object and not perform a copy at 4015 // all, even if the class copy constructor or destructor have side effects. 4016 4017 // FIXME: Is this enough? 4018 if (Constructor->isCopyConstructor()) { 4019 Expr *E = ((Expr **)ExprArgs.get())[0]; 4020 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4021 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4022 E = ICE->getSubExpr(); 4023 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 4024 E = FCE->getSubExpr(); 4025 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 4026 E = BE->getSubExpr(); 4027 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4028 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4029 E = ICE->getSubExpr(); 4030 4031 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 4032 Elidable = !CE->getCallReturnType()->isReferenceType(); 4033 else if (isa<CXXTemporaryObjectExpr>(E)) 4034 Elidable = true; 4035 else if (isa<CXXConstructExpr>(E)) 4036 Elidable = true; 4037 } 4038 4039 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4040 Elidable, move(ExprArgs), RequiresZeroInit, 4041 BaseInitialization); 4042} 4043 4044/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4045/// including handling of its default argument expressions. 4046Sema::OwningExprResult 4047Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4048 CXXConstructorDecl *Constructor, bool Elidable, 4049 MultiExprArg ExprArgs, 4050 bool RequiresZeroInit, 4051 bool BaseInitialization) { 4052 unsigned NumExprs = ExprArgs.size(); 4053 Expr **Exprs = (Expr **)ExprArgs.release(); 4054 4055 MarkDeclarationReferenced(ConstructLoc, Constructor); 4056 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4057 Constructor, Elidable, Exprs, NumExprs, 4058 RequiresZeroInit, BaseInitialization)); 4059} 4060 4061bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4062 CXXConstructorDecl *Constructor, 4063 MultiExprArg Exprs) { 4064 OwningExprResult TempResult = 4065 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4066 move(Exprs)); 4067 if (TempResult.isInvalid()) 4068 return true; 4069 4070 Expr *Temp = TempResult.takeAs<Expr>(); 4071 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4072 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4073 VD->setInit(Temp); 4074 4075 return false; 4076} 4077 4078void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4079 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4080 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4081 !ClassDecl->hasTrivialDestructor()) { 4082 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4083 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4084 CheckDestructorAccess(VD->getLocation(), Destructor, 4085 PDiag(diag::err_access_dtor_var) 4086 << VD->getDeclName() 4087 << VD->getType()); 4088 } 4089} 4090 4091/// AddCXXDirectInitializerToDecl - This action is called immediately after 4092/// ActOnDeclarator, when a C++ direct initializer is present. 4093/// e.g: "int x(1);" 4094void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4095 SourceLocation LParenLoc, 4096 MultiExprArg Exprs, 4097 SourceLocation *CommaLocs, 4098 SourceLocation RParenLoc) { 4099 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4100 Decl *RealDecl = Dcl.getAs<Decl>(); 4101 4102 // If there is no declaration, there was an error parsing it. Just ignore 4103 // the initializer. 4104 if (RealDecl == 0) 4105 return; 4106 4107 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4108 if (!VDecl) { 4109 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4110 RealDecl->setInvalidDecl(); 4111 return; 4112 } 4113 4114 // We will represent direct-initialization similarly to copy-initialization: 4115 // int x(1); -as-> int x = 1; 4116 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4117 // 4118 // Clients that want to distinguish between the two forms, can check for 4119 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4120 // A major benefit is that clients that don't particularly care about which 4121 // exactly form was it (like the CodeGen) can handle both cases without 4122 // special case code. 4123 4124 // C++ 8.5p11: 4125 // The form of initialization (using parentheses or '=') is generally 4126 // insignificant, but does matter when the entity being initialized has a 4127 // class type. 4128 QualType DeclInitType = VDecl->getType(); 4129 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4130 DeclInitType = Context.getBaseElementType(Array); 4131 4132 if (!VDecl->getType()->isDependentType() && 4133 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4134 diag::err_typecheck_decl_incomplete_type)) { 4135 VDecl->setInvalidDecl(); 4136 return; 4137 } 4138 4139 // The variable can not have an abstract class type. 4140 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4141 diag::err_abstract_type_in_decl, 4142 AbstractVariableType)) 4143 VDecl->setInvalidDecl(); 4144 4145 const VarDecl *Def; 4146 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4147 Diag(VDecl->getLocation(), diag::err_redefinition) 4148 << VDecl->getDeclName(); 4149 Diag(Def->getLocation(), diag::note_previous_definition); 4150 VDecl->setInvalidDecl(); 4151 return; 4152 } 4153 4154 // If either the declaration has a dependent type or if any of the 4155 // expressions is type-dependent, we represent the initialization 4156 // via a ParenListExpr for later use during template instantiation. 4157 if (VDecl->getType()->isDependentType() || 4158 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4159 // Let clients know that initialization was done with a direct initializer. 4160 VDecl->setCXXDirectInitializer(true); 4161 4162 // Store the initialization expressions as a ParenListExpr. 4163 unsigned NumExprs = Exprs.size(); 4164 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4165 (Expr **)Exprs.release(), 4166 NumExprs, RParenLoc)); 4167 return; 4168 } 4169 4170 // Capture the variable that is being initialized and the style of 4171 // initialization. 4172 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4173 4174 // FIXME: Poor source location information. 4175 InitializationKind Kind 4176 = InitializationKind::CreateDirect(VDecl->getLocation(), 4177 LParenLoc, RParenLoc); 4178 4179 InitializationSequence InitSeq(*this, Entity, Kind, 4180 (Expr**)Exprs.get(), Exprs.size()); 4181 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4182 if (Result.isInvalid()) { 4183 VDecl->setInvalidDecl(); 4184 return; 4185 } 4186 4187 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4188 VDecl->setInit(Result.takeAs<Expr>()); 4189 VDecl->setCXXDirectInitializer(true); 4190 4191 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4192 FinalizeVarWithDestructor(VDecl, Record); 4193} 4194 4195/// \brief Add the applicable constructor candidates for an initialization 4196/// by constructor. 4197static void AddConstructorInitializationCandidates(Sema &SemaRef, 4198 QualType ClassType, 4199 Expr **Args, 4200 unsigned NumArgs, 4201 InitializationKind Kind, 4202 OverloadCandidateSet &CandidateSet) { 4203 // C++ [dcl.init]p14: 4204 // If the initialization is direct-initialization, or if it is 4205 // copy-initialization where the cv-unqualified version of the 4206 // source type is the same class as, or a derived class of, the 4207 // class of the destination, constructors are considered. The 4208 // applicable constructors are enumerated (13.3.1.3), and the 4209 // best one is chosen through overload resolution (13.3). The 4210 // constructor so selected is called to initialize the object, 4211 // with the initializer expression(s) as its argument(s). If no 4212 // constructor applies, or the overload resolution is ambiguous, 4213 // the initialization is ill-formed. 4214 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4215 assert(ClassRec && "Can only initialize a class type here"); 4216 4217 // FIXME: When we decide not to synthesize the implicitly-declared 4218 // constructors, we'll need to make them appear here. 4219 4220 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4221 DeclarationName ConstructorName 4222 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4223 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4224 DeclContext::lookup_const_iterator Con, ConEnd; 4225 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4226 Con != ConEnd; ++Con) { 4227 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4228 4229 // Find the constructor (which may be a template). 4230 CXXConstructorDecl *Constructor = 0; 4231 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4232 if (ConstructorTmpl) 4233 Constructor 4234 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4235 else 4236 Constructor = cast<CXXConstructorDecl>(*Con); 4237 4238 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4239 (Kind.getKind() == InitializationKind::IK_Value) || 4240 (Kind.getKind() == InitializationKind::IK_Copy && 4241 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4242 ((Kind.getKind() == InitializationKind::IK_Default) && 4243 Constructor->isDefaultConstructor())) { 4244 if (ConstructorTmpl) 4245 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4246 /*ExplicitArgs*/ 0, 4247 Args, NumArgs, CandidateSet); 4248 else 4249 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4250 Args, NumArgs, CandidateSet); 4251 } 4252 } 4253} 4254 4255/// \brief Attempt to perform initialization by constructor 4256/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4257/// copy-initialization. 4258/// 4259/// This routine determines whether initialization by constructor is possible, 4260/// but it does not emit any diagnostics in the case where the initialization 4261/// is ill-formed. 4262/// 4263/// \param ClassType the type of the object being initialized, which must have 4264/// class type. 4265/// 4266/// \param Args the arguments provided to initialize the object 4267/// 4268/// \param NumArgs the number of arguments provided to initialize the object 4269/// 4270/// \param Kind the type of initialization being performed 4271/// 4272/// \returns the constructor used to initialize the object, if successful. 4273/// Otherwise, emits a diagnostic and returns NULL. 4274CXXConstructorDecl * 4275Sema::TryInitializationByConstructor(QualType ClassType, 4276 Expr **Args, unsigned NumArgs, 4277 SourceLocation Loc, 4278 InitializationKind Kind) { 4279 // Build the overload candidate set 4280 OverloadCandidateSet CandidateSet(Loc); 4281 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4282 CandidateSet); 4283 4284 // Determine whether we found a constructor we can use. 4285 OverloadCandidateSet::iterator Best; 4286 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4287 case OR_Success: 4288 case OR_Deleted: 4289 // We found a constructor. Return it. 4290 return cast<CXXConstructorDecl>(Best->Function); 4291 4292 case OR_No_Viable_Function: 4293 case OR_Ambiguous: 4294 // Overload resolution failed. Return nothing. 4295 return 0; 4296 } 4297 4298 // Silence GCC warning 4299 return 0; 4300} 4301 4302/// \brief Given a constructor and the set of arguments provided for the 4303/// constructor, convert the arguments and add any required default arguments 4304/// to form a proper call to this constructor. 4305/// 4306/// \returns true if an error occurred, false otherwise. 4307bool 4308Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4309 MultiExprArg ArgsPtr, 4310 SourceLocation Loc, 4311 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4312 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4313 unsigned NumArgs = ArgsPtr.size(); 4314 Expr **Args = (Expr **)ArgsPtr.get(); 4315 4316 const FunctionProtoType *Proto 4317 = Constructor->getType()->getAs<FunctionProtoType>(); 4318 assert(Proto && "Constructor without a prototype?"); 4319 unsigned NumArgsInProto = Proto->getNumArgs(); 4320 4321 // If too few arguments are available, we'll fill in the rest with defaults. 4322 if (NumArgs < NumArgsInProto) 4323 ConvertedArgs.reserve(NumArgsInProto); 4324 else 4325 ConvertedArgs.reserve(NumArgs); 4326 4327 VariadicCallType CallType = 4328 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4329 llvm::SmallVector<Expr *, 8> AllArgs; 4330 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4331 Proto, 0, Args, NumArgs, AllArgs, 4332 CallType); 4333 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4334 ConvertedArgs.push_back(AllArgs[i]); 4335 return Invalid; 4336} 4337 4338/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4339/// determine whether they are reference-related, 4340/// reference-compatible, reference-compatible with added 4341/// qualification, or incompatible, for use in C++ initialization by 4342/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4343/// type, and the first type (T1) is the pointee type of the reference 4344/// type being initialized. 4345Sema::ReferenceCompareResult 4346Sema::CompareReferenceRelationship(SourceLocation Loc, 4347 QualType OrigT1, QualType OrigT2, 4348 bool& DerivedToBase) { 4349 assert(!OrigT1->isReferenceType() && 4350 "T1 must be the pointee type of the reference type"); 4351 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4352 4353 QualType T1 = Context.getCanonicalType(OrigT1); 4354 QualType T2 = Context.getCanonicalType(OrigT2); 4355 Qualifiers T1Quals, T2Quals; 4356 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4357 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4358 4359 // C++ [dcl.init.ref]p4: 4360 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4361 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4362 // T1 is a base class of T2. 4363 if (UnqualT1 == UnqualT2) 4364 DerivedToBase = false; 4365 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4366 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4367 IsDerivedFrom(UnqualT2, UnqualT1)) 4368 DerivedToBase = true; 4369 else 4370 return Ref_Incompatible; 4371 4372 // At this point, we know that T1 and T2 are reference-related (at 4373 // least). 4374 4375 // If the type is an array type, promote the element qualifiers to the type 4376 // for comparison. 4377 if (isa<ArrayType>(T1) && T1Quals) 4378 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4379 if (isa<ArrayType>(T2) && T2Quals) 4380 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4381 4382 // C++ [dcl.init.ref]p4: 4383 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4384 // reference-related to T2 and cv1 is the same cv-qualification 4385 // as, or greater cv-qualification than, cv2. For purposes of 4386 // overload resolution, cases for which cv1 is greater 4387 // cv-qualification than cv2 are identified as 4388 // reference-compatible with added qualification (see 13.3.3.2). 4389 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4390 return Ref_Compatible; 4391 else if (T1.isMoreQualifiedThan(T2)) 4392 return Ref_Compatible_With_Added_Qualification; 4393 else 4394 return Ref_Related; 4395} 4396 4397/// CheckReferenceInit - Check the initialization of a reference 4398/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4399/// the initializer (either a simple initializer or an initializer 4400/// list), and DeclType is the type of the declaration. When ICS is 4401/// non-null, this routine will compute the implicit conversion 4402/// sequence according to C++ [over.ics.ref] and will not produce any 4403/// diagnostics; when ICS is null, it will emit diagnostics when any 4404/// errors are found. Either way, a return value of true indicates 4405/// that there was a failure, a return value of false indicates that 4406/// the reference initialization succeeded. 4407/// 4408/// When @p SuppressUserConversions, user-defined conversions are 4409/// suppressed. 4410/// When @p AllowExplicit, we also permit explicit user-defined 4411/// conversion functions. 4412/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4413/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4414/// This is used when this is called from a C-style cast. 4415bool 4416Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4417 SourceLocation DeclLoc, 4418 bool SuppressUserConversions, 4419 bool AllowExplicit, bool ForceRValue, 4420 ImplicitConversionSequence *ICS, 4421 bool IgnoreBaseAccess) { 4422 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4423 4424 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4425 QualType T2 = Init->getType(); 4426 4427 // If the initializer is the address of an overloaded function, try 4428 // to resolve the overloaded function. If all goes well, T2 is the 4429 // type of the resulting function. 4430 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4431 DeclAccessPair Found; 4432 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4433 ICS != 0, Found); 4434 if (Fn) { 4435 // Since we're performing this reference-initialization for 4436 // real, update the initializer with the resulting function. 4437 if (!ICS) { 4438 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4439 return true; 4440 4441 CheckAddressOfMemberAccess(Init, Found); 4442 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4443 } 4444 4445 T2 = Fn->getType(); 4446 } 4447 } 4448 4449 // Compute some basic properties of the types and the initializer. 4450 bool isRValRef = DeclType->isRValueReferenceType(); 4451 bool DerivedToBase = false; 4452 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4453 Init->isLvalue(Context); 4454 ReferenceCompareResult RefRelationship 4455 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4456 4457 // Most paths end in a failed conversion. 4458 if (ICS) { 4459 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4460 } 4461 4462 // C++ [dcl.init.ref]p5: 4463 // A reference to type "cv1 T1" is initialized by an expression 4464 // of type "cv2 T2" as follows: 4465 4466 // -- If the initializer expression 4467 4468 // Rvalue references cannot bind to lvalues (N2812). 4469 // There is absolutely no situation where they can. In particular, note that 4470 // this is ill-formed, even if B has a user-defined conversion to A&&: 4471 // B b; 4472 // A&& r = b; 4473 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4474 if (!ICS) 4475 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4476 << Init->getSourceRange(); 4477 return true; 4478 } 4479 4480 bool BindsDirectly = false; 4481 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4482 // reference-compatible with "cv2 T2," or 4483 // 4484 // Note that the bit-field check is skipped if we are just computing 4485 // the implicit conversion sequence (C++ [over.best.ics]p2). 4486 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4487 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4488 BindsDirectly = true; 4489 4490 if (ICS) { 4491 // C++ [over.ics.ref]p1: 4492 // When a parameter of reference type binds directly (8.5.3) 4493 // to an argument expression, the implicit conversion sequence 4494 // is the identity conversion, unless the argument expression 4495 // has a type that is a derived class of the parameter type, 4496 // in which case the implicit conversion sequence is a 4497 // derived-to-base Conversion (13.3.3.1). 4498 ICS->setStandard(); 4499 ICS->Standard.First = ICK_Identity; 4500 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4501 ICS->Standard.Third = ICK_Identity; 4502 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4503 ICS->Standard.setToType(0, T2); 4504 ICS->Standard.setToType(1, T1); 4505 ICS->Standard.setToType(2, T1); 4506 ICS->Standard.ReferenceBinding = true; 4507 ICS->Standard.DirectBinding = true; 4508 ICS->Standard.RRefBinding = false; 4509 ICS->Standard.CopyConstructor = 0; 4510 4511 // Nothing more to do: the inaccessibility/ambiguity check for 4512 // derived-to-base conversions is suppressed when we're 4513 // computing the implicit conversion sequence (C++ 4514 // [over.best.ics]p2). 4515 return false; 4516 } else { 4517 // Perform the conversion. 4518 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4519 if (DerivedToBase) 4520 CK = CastExpr::CK_DerivedToBase; 4521 else if(CheckExceptionSpecCompatibility(Init, T1)) 4522 return true; 4523 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4524 } 4525 } 4526 4527 // -- has a class type (i.e., T2 is a class type) and can be 4528 // implicitly converted to an lvalue of type "cv3 T3," 4529 // where "cv1 T1" is reference-compatible with "cv3 T3" 4530 // 92) (this conversion is selected by enumerating the 4531 // applicable conversion functions (13.3.1.6) and choosing 4532 // the best one through overload resolution (13.3)), 4533 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4534 !RequireCompleteType(DeclLoc, T2, 0)) { 4535 CXXRecordDecl *T2RecordDecl 4536 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4537 4538 OverloadCandidateSet CandidateSet(DeclLoc); 4539 const UnresolvedSetImpl *Conversions 4540 = T2RecordDecl->getVisibleConversionFunctions(); 4541 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4542 E = Conversions->end(); I != E; ++I) { 4543 NamedDecl *D = *I; 4544 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4545 if (isa<UsingShadowDecl>(D)) 4546 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4547 4548 FunctionTemplateDecl *ConvTemplate 4549 = dyn_cast<FunctionTemplateDecl>(D); 4550 CXXConversionDecl *Conv; 4551 if (ConvTemplate) 4552 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4553 else 4554 Conv = cast<CXXConversionDecl>(D); 4555 4556 // If the conversion function doesn't return a reference type, 4557 // it can't be considered for this conversion. 4558 if (Conv->getConversionType()->isLValueReferenceType() && 4559 (AllowExplicit || !Conv->isExplicit())) { 4560 if (ConvTemplate) 4561 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4562 Init, DeclType, CandidateSet); 4563 else 4564 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4565 DeclType, CandidateSet); 4566 } 4567 } 4568 4569 OverloadCandidateSet::iterator Best; 4570 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4571 case OR_Success: 4572 // C++ [over.ics.ref]p1: 4573 // 4574 // [...] If the parameter binds directly to the result of 4575 // applying a conversion function to the argument 4576 // expression, the implicit conversion sequence is a 4577 // user-defined conversion sequence (13.3.3.1.2), with the 4578 // second standard conversion sequence either an identity 4579 // conversion or, if the conversion function returns an 4580 // entity of a type that is a derived class of the parameter 4581 // type, a derived-to-base Conversion. 4582 if (!Best->FinalConversion.DirectBinding) 4583 break; 4584 4585 // This is a direct binding. 4586 BindsDirectly = true; 4587 4588 if (ICS) { 4589 ICS->setUserDefined(); 4590 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4591 ICS->UserDefined.After = Best->FinalConversion; 4592 ICS->UserDefined.ConversionFunction = Best->Function; 4593 ICS->UserDefined.EllipsisConversion = false; 4594 assert(ICS->UserDefined.After.ReferenceBinding && 4595 ICS->UserDefined.After.DirectBinding && 4596 "Expected a direct reference binding!"); 4597 return false; 4598 } else { 4599 OwningExprResult InitConversion = 4600 BuildCXXCastArgument(DeclLoc, QualType(), 4601 CastExpr::CK_UserDefinedConversion, 4602 cast<CXXMethodDecl>(Best->Function), 4603 Owned(Init)); 4604 Init = InitConversion.takeAs<Expr>(); 4605 4606 if (CheckExceptionSpecCompatibility(Init, T1)) 4607 return true; 4608 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4609 /*isLvalue=*/true); 4610 } 4611 break; 4612 4613 case OR_Ambiguous: 4614 if (ICS) { 4615 ICS->setAmbiguous(); 4616 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4617 Cand != CandidateSet.end(); ++Cand) 4618 if (Cand->Viable) 4619 ICS->Ambiguous.addConversion(Cand->Function); 4620 break; 4621 } 4622 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4623 << Init->getSourceRange(); 4624 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4625 return true; 4626 4627 case OR_No_Viable_Function: 4628 case OR_Deleted: 4629 // There was no suitable conversion, or we found a deleted 4630 // conversion; continue with other checks. 4631 break; 4632 } 4633 } 4634 4635 if (BindsDirectly) { 4636 // C++ [dcl.init.ref]p4: 4637 // [...] In all cases where the reference-related or 4638 // reference-compatible relationship of two types is used to 4639 // establish the validity of a reference binding, and T1 is a 4640 // base class of T2, a program that necessitates such a binding 4641 // is ill-formed if T1 is an inaccessible (clause 11) or 4642 // ambiguous (10.2) base class of T2. 4643 // 4644 // Note that we only check this condition when we're allowed to 4645 // complain about errors, because we should not be checking for 4646 // ambiguity (or inaccessibility) unless the reference binding 4647 // actually happens. 4648 if (DerivedToBase) 4649 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4650 Init->getSourceRange(), 4651 IgnoreBaseAccess); 4652 else 4653 return false; 4654 } 4655 4656 // -- Otherwise, the reference shall be to a non-volatile const 4657 // type (i.e., cv1 shall be const), or the reference shall be an 4658 // rvalue reference and the initializer expression shall be an rvalue. 4659 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4660 if (!ICS) 4661 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4662 << T1.isVolatileQualified() 4663 << T1 << int(InitLvalue != Expr::LV_Valid) 4664 << T2 << Init->getSourceRange(); 4665 return true; 4666 } 4667 4668 // -- If the initializer expression is an rvalue, with T2 a 4669 // class type, and "cv1 T1" is reference-compatible with 4670 // "cv2 T2," the reference is bound in one of the 4671 // following ways (the choice is implementation-defined): 4672 // 4673 // -- The reference is bound to the object represented by 4674 // the rvalue (see 3.10) or to a sub-object within that 4675 // object. 4676 // 4677 // -- A temporary of type "cv1 T2" [sic] is created, and 4678 // a constructor is called to copy the entire rvalue 4679 // object into the temporary. The reference is bound to 4680 // the temporary or to a sub-object within the 4681 // temporary. 4682 // 4683 // The constructor that would be used to make the copy 4684 // shall be callable whether or not the copy is actually 4685 // done. 4686 // 4687 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4688 // freedom, so we will always take the first option and never build 4689 // a temporary in this case. FIXME: We will, however, have to check 4690 // for the presence of a copy constructor in C++98/03 mode. 4691 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4692 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4693 if (ICS) { 4694 ICS->setStandard(); 4695 ICS->Standard.First = ICK_Identity; 4696 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4697 ICS->Standard.Third = ICK_Identity; 4698 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4699 ICS->Standard.setToType(0, T2); 4700 ICS->Standard.setToType(1, T1); 4701 ICS->Standard.setToType(2, T1); 4702 ICS->Standard.ReferenceBinding = true; 4703 ICS->Standard.DirectBinding = false; 4704 ICS->Standard.RRefBinding = isRValRef; 4705 ICS->Standard.CopyConstructor = 0; 4706 } else { 4707 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4708 if (DerivedToBase) 4709 CK = CastExpr::CK_DerivedToBase; 4710 else if(CheckExceptionSpecCompatibility(Init, T1)) 4711 return true; 4712 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4713 } 4714 return false; 4715 } 4716 4717 // -- Otherwise, a temporary of type "cv1 T1" is created and 4718 // initialized from the initializer expression using the 4719 // rules for a non-reference copy initialization (8.5). The 4720 // reference is then bound to the temporary. If T1 is 4721 // reference-related to T2, cv1 must be the same 4722 // cv-qualification as, or greater cv-qualification than, 4723 // cv2; otherwise, the program is ill-formed. 4724 if (RefRelationship == Ref_Related) { 4725 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4726 // we would be reference-compatible or reference-compatible with 4727 // added qualification. But that wasn't the case, so the reference 4728 // initialization fails. 4729 if (!ICS) 4730 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4731 << T1 << int(InitLvalue != Expr::LV_Valid) 4732 << T2 << Init->getSourceRange(); 4733 return true; 4734 } 4735 4736 // If at least one of the types is a class type, the types are not 4737 // related, and we aren't allowed any user conversions, the 4738 // reference binding fails. This case is important for breaking 4739 // recursion, since TryImplicitConversion below will attempt to 4740 // create a temporary through the use of a copy constructor. 4741 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4742 (T1->isRecordType() || T2->isRecordType())) { 4743 if (!ICS) 4744 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4745 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4746 return true; 4747 } 4748 4749 // Actually try to convert the initializer to T1. 4750 if (ICS) { 4751 // C++ [over.ics.ref]p2: 4752 // 4753 // When a parameter of reference type is not bound directly to 4754 // an argument expression, the conversion sequence is the one 4755 // required to convert the argument expression to the 4756 // underlying type of the reference according to 4757 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4758 // to copy-initializing a temporary of the underlying type with 4759 // the argument expression. Any difference in top-level 4760 // cv-qualification is subsumed by the initialization itself 4761 // and does not constitute a conversion. 4762 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4763 /*AllowExplicit=*/false, 4764 /*ForceRValue=*/false, 4765 /*InOverloadResolution=*/false); 4766 4767 // Of course, that's still a reference binding. 4768 if (ICS->isStandard()) { 4769 ICS->Standard.ReferenceBinding = true; 4770 ICS->Standard.RRefBinding = isRValRef; 4771 } else if (ICS->isUserDefined()) { 4772 ICS->UserDefined.After.ReferenceBinding = true; 4773 ICS->UserDefined.After.RRefBinding = isRValRef; 4774 } 4775 return ICS->isBad(); 4776 } else { 4777 ImplicitConversionSequence Conversions; 4778 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4779 false, false, 4780 Conversions); 4781 if (badConversion) { 4782 if (Conversions.isAmbiguous()) { 4783 Diag(DeclLoc, 4784 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4785 for (int j = Conversions.Ambiguous.conversions().size()-1; 4786 j >= 0; j--) { 4787 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4788 NoteOverloadCandidate(Func); 4789 } 4790 } 4791 else { 4792 if (isRValRef) 4793 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4794 << Init->getSourceRange(); 4795 else 4796 Diag(DeclLoc, diag::err_invalid_initialization) 4797 << DeclType << Init->getType() << Init->getSourceRange(); 4798 } 4799 } 4800 return badConversion; 4801 } 4802} 4803 4804static inline bool 4805CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4806 const FunctionDecl *FnDecl) { 4807 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4808 if (isa<NamespaceDecl>(DC)) { 4809 return SemaRef.Diag(FnDecl->getLocation(), 4810 diag::err_operator_new_delete_declared_in_namespace) 4811 << FnDecl->getDeclName(); 4812 } 4813 4814 if (isa<TranslationUnitDecl>(DC) && 4815 FnDecl->getStorageClass() == FunctionDecl::Static) { 4816 return SemaRef.Diag(FnDecl->getLocation(), 4817 diag::err_operator_new_delete_declared_static) 4818 << FnDecl->getDeclName(); 4819 } 4820 4821 return false; 4822} 4823 4824static inline bool 4825CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4826 CanQualType ExpectedResultType, 4827 CanQualType ExpectedFirstParamType, 4828 unsigned DependentParamTypeDiag, 4829 unsigned InvalidParamTypeDiag) { 4830 QualType ResultType = 4831 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4832 4833 // Check that the result type is not dependent. 4834 if (ResultType->isDependentType()) 4835 return SemaRef.Diag(FnDecl->getLocation(), 4836 diag::err_operator_new_delete_dependent_result_type) 4837 << FnDecl->getDeclName() << ExpectedResultType; 4838 4839 // Check that the result type is what we expect. 4840 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4841 return SemaRef.Diag(FnDecl->getLocation(), 4842 diag::err_operator_new_delete_invalid_result_type) 4843 << FnDecl->getDeclName() << ExpectedResultType; 4844 4845 // A function template must have at least 2 parameters. 4846 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4847 return SemaRef.Diag(FnDecl->getLocation(), 4848 diag::err_operator_new_delete_template_too_few_parameters) 4849 << FnDecl->getDeclName(); 4850 4851 // The function decl must have at least 1 parameter. 4852 if (FnDecl->getNumParams() == 0) 4853 return SemaRef.Diag(FnDecl->getLocation(), 4854 diag::err_operator_new_delete_too_few_parameters) 4855 << FnDecl->getDeclName(); 4856 4857 // Check the the first parameter type is not dependent. 4858 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4859 if (FirstParamType->isDependentType()) 4860 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4861 << FnDecl->getDeclName() << ExpectedFirstParamType; 4862 4863 // Check that the first parameter type is what we expect. 4864 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4865 ExpectedFirstParamType) 4866 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4867 << FnDecl->getDeclName() << ExpectedFirstParamType; 4868 4869 return false; 4870} 4871 4872static bool 4873CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4874 // C++ [basic.stc.dynamic.allocation]p1: 4875 // A program is ill-formed if an allocation function is declared in a 4876 // namespace scope other than global scope or declared static in global 4877 // scope. 4878 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4879 return true; 4880 4881 CanQualType SizeTy = 4882 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4883 4884 // C++ [basic.stc.dynamic.allocation]p1: 4885 // The return type shall be void*. The first parameter shall have type 4886 // std::size_t. 4887 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4888 SizeTy, 4889 diag::err_operator_new_dependent_param_type, 4890 diag::err_operator_new_param_type)) 4891 return true; 4892 4893 // C++ [basic.stc.dynamic.allocation]p1: 4894 // The first parameter shall not have an associated default argument. 4895 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4896 return SemaRef.Diag(FnDecl->getLocation(), 4897 diag::err_operator_new_default_arg) 4898 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4899 4900 return false; 4901} 4902 4903static bool 4904CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4905 // C++ [basic.stc.dynamic.deallocation]p1: 4906 // A program is ill-formed if deallocation functions are declared in a 4907 // namespace scope other than global scope or declared static in global 4908 // scope. 4909 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4910 return true; 4911 4912 // C++ [basic.stc.dynamic.deallocation]p2: 4913 // Each deallocation function shall return void and its first parameter 4914 // shall be void*. 4915 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4916 SemaRef.Context.VoidPtrTy, 4917 diag::err_operator_delete_dependent_param_type, 4918 diag::err_operator_delete_param_type)) 4919 return true; 4920 4921 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4922 if (FirstParamType->isDependentType()) 4923 return SemaRef.Diag(FnDecl->getLocation(), 4924 diag::err_operator_delete_dependent_param_type) 4925 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4926 4927 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4928 SemaRef.Context.VoidPtrTy) 4929 return SemaRef.Diag(FnDecl->getLocation(), 4930 diag::err_operator_delete_param_type) 4931 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4932 4933 return false; 4934} 4935 4936/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4937/// of this overloaded operator is well-formed. If so, returns false; 4938/// otherwise, emits appropriate diagnostics and returns true. 4939bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4940 assert(FnDecl && FnDecl->isOverloadedOperator() && 4941 "Expected an overloaded operator declaration"); 4942 4943 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4944 4945 // C++ [over.oper]p5: 4946 // The allocation and deallocation functions, operator new, 4947 // operator new[], operator delete and operator delete[], are 4948 // described completely in 3.7.3. The attributes and restrictions 4949 // found in the rest of this subclause do not apply to them unless 4950 // explicitly stated in 3.7.3. 4951 if (Op == OO_Delete || Op == OO_Array_Delete) 4952 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4953 4954 if (Op == OO_New || Op == OO_Array_New) 4955 return CheckOperatorNewDeclaration(*this, FnDecl); 4956 4957 // C++ [over.oper]p6: 4958 // An operator function shall either be a non-static member 4959 // function or be a non-member function and have at least one 4960 // parameter whose type is a class, a reference to a class, an 4961 // enumeration, or a reference to an enumeration. 4962 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4963 if (MethodDecl->isStatic()) 4964 return Diag(FnDecl->getLocation(), 4965 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4966 } else { 4967 bool ClassOrEnumParam = false; 4968 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4969 ParamEnd = FnDecl->param_end(); 4970 Param != ParamEnd; ++Param) { 4971 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4972 if (ParamType->isDependentType() || ParamType->isRecordType() || 4973 ParamType->isEnumeralType()) { 4974 ClassOrEnumParam = true; 4975 break; 4976 } 4977 } 4978 4979 if (!ClassOrEnumParam) 4980 return Diag(FnDecl->getLocation(), 4981 diag::err_operator_overload_needs_class_or_enum) 4982 << FnDecl->getDeclName(); 4983 } 4984 4985 // C++ [over.oper]p8: 4986 // An operator function cannot have default arguments (8.3.6), 4987 // except where explicitly stated below. 4988 // 4989 // Only the function-call operator allows default arguments 4990 // (C++ [over.call]p1). 4991 if (Op != OO_Call) { 4992 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4993 Param != FnDecl->param_end(); ++Param) { 4994 if ((*Param)->hasDefaultArg()) 4995 return Diag((*Param)->getLocation(), 4996 diag::err_operator_overload_default_arg) 4997 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4998 } 4999 } 5000 5001 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5002 { false, false, false } 5003#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5004 , { Unary, Binary, MemberOnly } 5005#include "clang/Basic/OperatorKinds.def" 5006 }; 5007 5008 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5009 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5010 bool MustBeMemberOperator = OperatorUses[Op][2]; 5011 5012 // C++ [over.oper]p8: 5013 // [...] Operator functions cannot have more or fewer parameters 5014 // than the number required for the corresponding operator, as 5015 // described in the rest of this subclause. 5016 unsigned NumParams = FnDecl->getNumParams() 5017 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5018 if (Op != OO_Call && 5019 ((NumParams == 1 && !CanBeUnaryOperator) || 5020 (NumParams == 2 && !CanBeBinaryOperator) || 5021 (NumParams < 1) || (NumParams > 2))) { 5022 // We have the wrong number of parameters. 5023 unsigned ErrorKind; 5024 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5025 ErrorKind = 2; // 2 -> unary or binary. 5026 } else if (CanBeUnaryOperator) { 5027 ErrorKind = 0; // 0 -> unary 5028 } else { 5029 assert(CanBeBinaryOperator && 5030 "All non-call overloaded operators are unary or binary!"); 5031 ErrorKind = 1; // 1 -> binary 5032 } 5033 5034 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5035 << FnDecl->getDeclName() << NumParams << ErrorKind; 5036 } 5037 5038 // Overloaded operators other than operator() cannot be variadic. 5039 if (Op != OO_Call && 5040 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5041 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5042 << FnDecl->getDeclName(); 5043 } 5044 5045 // Some operators must be non-static member functions. 5046 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5047 return Diag(FnDecl->getLocation(), 5048 diag::err_operator_overload_must_be_member) 5049 << FnDecl->getDeclName(); 5050 } 5051 5052 // C++ [over.inc]p1: 5053 // The user-defined function called operator++ implements the 5054 // prefix and postfix ++ operator. If this function is a member 5055 // function with no parameters, or a non-member function with one 5056 // parameter of class or enumeration type, it defines the prefix 5057 // increment operator ++ for objects of that type. If the function 5058 // is a member function with one parameter (which shall be of type 5059 // int) or a non-member function with two parameters (the second 5060 // of which shall be of type int), it defines the postfix 5061 // increment operator ++ for objects of that type. 5062 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5063 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5064 bool ParamIsInt = false; 5065 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5066 ParamIsInt = BT->getKind() == BuiltinType::Int; 5067 5068 if (!ParamIsInt) 5069 return Diag(LastParam->getLocation(), 5070 diag::err_operator_overload_post_incdec_must_be_int) 5071 << LastParam->getType() << (Op == OO_MinusMinus); 5072 } 5073 5074 // Notify the class if it got an assignment operator. 5075 if (Op == OO_Equal) { 5076 // Would have returned earlier otherwise. 5077 assert(isa<CXXMethodDecl>(FnDecl) && 5078 "Overloaded = not member, but not filtered."); 5079 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5080 Method->getParent()->addedAssignmentOperator(Context, Method); 5081 } 5082 5083 return false; 5084} 5085 5086/// CheckLiteralOperatorDeclaration - Check whether the declaration 5087/// of this literal operator function is well-formed. If so, returns 5088/// false; otherwise, emits appropriate diagnostics and returns true. 5089bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5090 DeclContext *DC = FnDecl->getDeclContext(); 5091 Decl::Kind Kind = DC->getDeclKind(); 5092 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5093 Kind != Decl::LinkageSpec) { 5094 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5095 << FnDecl->getDeclName(); 5096 return true; 5097 } 5098 5099 bool Valid = false; 5100 5101 // FIXME: Check for the one valid template signature 5102 // template <char...> type operator "" name(); 5103 5104 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5105 // Check the first parameter 5106 QualType T = (*Param)->getType(); 5107 5108 // unsigned long long int and long double are allowed, but only 5109 // alone. 5110 // We also allow any character type; their omission seems to be a bug 5111 // in n3000 5112 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5113 Context.hasSameType(T, Context.LongDoubleTy) || 5114 Context.hasSameType(T, Context.CharTy) || 5115 Context.hasSameType(T, Context.WCharTy) || 5116 Context.hasSameType(T, Context.Char16Ty) || 5117 Context.hasSameType(T, Context.Char32Ty)) { 5118 if (++Param == FnDecl->param_end()) 5119 Valid = true; 5120 goto FinishedParams; 5121 } 5122 5123 // Otherwise it must be a pointer to const; let's strip those. 5124 const PointerType *PT = T->getAs<PointerType>(); 5125 if (!PT) 5126 goto FinishedParams; 5127 T = PT->getPointeeType(); 5128 if (!T.isConstQualified()) 5129 goto FinishedParams; 5130 T = T.getUnqualifiedType(); 5131 5132 // Move on to the second parameter; 5133 ++Param; 5134 5135 // If there is no second parameter, the first must be a const char * 5136 if (Param == FnDecl->param_end()) { 5137 if (Context.hasSameType(T, Context.CharTy)) 5138 Valid = true; 5139 goto FinishedParams; 5140 } 5141 5142 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5143 // are allowed as the first parameter to a two-parameter function 5144 if (!(Context.hasSameType(T, Context.CharTy) || 5145 Context.hasSameType(T, Context.WCharTy) || 5146 Context.hasSameType(T, Context.Char16Ty) || 5147 Context.hasSameType(T, Context.Char32Ty))) 5148 goto FinishedParams; 5149 5150 // The second and final parameter must be an std::size_t 5151 T = (*Param)->getType().getUnqualifiedType(); 5152 if (Context.hasSameType(T, Context.getSizeType()) && 5153 ++Param == FnDecl->param_end()) 5154 Valid = true; 5155 } 5156 5157 // FIXME: This diagnostic is absolutely terrible. 5158FinishedParams: 5159 if (!Valid) { 5160 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5161 << FnDecl->getDeclName(); 5162 return true; 5163 } 5164 5165 return false; 5166} 5167 5168/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5169/// linkage specification, including the language and (if present) 5170/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5171/// the location of the language string literal, which is provided 5172/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5173/// the '{' brace. Otherwise, this linkage specification does not 5174/// have any braces. 5175Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5176 SourceLocation ExternLoc, 5177 SourceLocation LangLoc, 5178 const char *Lang, 5179 unsigned StrSize, 5180 SourceLocation LBraceLoc) { 5181 LinkageSpecDecl::LanguageIDs Language; 5182 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5183 Language = LinkageSpecDecl::lang_c; 5184 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5185 Language = LinkageSpecDecl::lang_cxx; 5186 else { 5187 Diag(LangLoc, diag::err_bad_language); 5188 return DeclPtrTy(); 5189 } 5190 5191 // FIXME: Add all the various semantics of linkage specifications 5192 5193 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5194 LangLoc, Language, 5195 LBraceLoc.isValid()); 5196 CurContext->addDecl(D); 5197 PushDeclContext(S, D); 5198 return DeclPtrTy::make(D); 5199} 5200 5201/// ActOnFinishLinkageSpecification - Completely the definition of 5202/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5203/// valid, it's the position of the closing '}' brace in a linkage 5204/// specification that uses braces. 5205Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5206 DeclPtrTy LinkageSpec, 5207 SourceLocation RBraceLoc) { 5208 if (LinkageSpec) 5209 PopDeclContext(); 5210 return LinkageSpec; 5211} 5212 5213/// \brief Perform semantic analysis for the variable declaration that 5214/// occurs within a C++ catch clause, returning the newly-created 5215/// variable. 5216VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5217 TypeSourceInfo *TInfo, 5218 IdentifierInfo *Name, 5219 SourceLocation Loc, 5220 SourceRange Range) { 5221 bool Invalid = false; 5222 5223 // Arrays and functions decay. 5224 if (ExDeclType->isArrayType()) 5225 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5226 else if (ExDeclType->isFunctionType()) 5227 ExDeclType = Context.getPointerType(ExDeclType); 5228 5229 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5230 // The exception-declaration shall not denote a pointer or reference to an 5231 // incomplete type, other than [cv] void*. 5232 // N2844 forbids rvalue references. 5233 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5234 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5235 Invalid = true; 5236 } 5237 5238 // GCC allows catching pointers and references to incomplete types 5239 // as an extension; so do we, but we warn by default. 5240 5241 QualType BaseType = ExDeclType; 5242 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5243 unsigned DK = diag::err_catch_incomplete; 5244 bool IncompleteCatchIsInvalid = true; 5245 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5246 BaseType = Ptr->getPointeeType(); 5247 Mode = 1; 5248 DK = diag::ext_catch_incomplete_ptr; 5249 IncompleteCatchIsInvalid = false; 5250 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5251 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5252 BaseType = Ref->getPointeeType(); 5253 Mode = 2; 5254 DK = diag::ext_catch_incomplete_ref; 5255 IncompleteCatchIsInvalid = false; 5256 } 5257 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5258 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5259 IncompleteCatchIsInvalid) 5260 Invalid = true; 5261 5262 if (!Invalid && !ExDeclType->isDependentType() && 5263 RequireNonAbstractType(Loc, ExDeclType, 5264 diag::err_abstract_type_in_decl, 5265 AbstractVariableType)) 5266 Invalid = true; 5267 5268 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5269 Name, ExDeclType, TInfo, VarDecl::None); 5270 5271 if (!Invalid) { 5272 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5273 // C++ [except.handle]p16: 5274 // The object declared in an exception-declaration or, if the 5275 // exception-declaration does not specify a name, a temporary (12.2) is 5276 // copy-initialized (8.5) from the exception object. [...] 5277 // The object is destroyed when the handler exits, after the destruction 5278 // of any automatic objects initialized within the handler. 5279 // 5280 // We just pretend to initialize the object with itself, then make sure 5281 // it can be destroyed later. 5282 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5283 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5284 Loc, ExDeclType, 0); 5285 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5286 SourceLocation()); 5287 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5288 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5289 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5290 if (Result.isInvalid()) 5291 Invalid = true; 5292 else 5293 FinalizeVarWithDestructor(ExDecl, RecordTy); 5294 } 5295 } 5296 5297 if (Invalid) 5298 ExDecl->setInvalidDecl(); 5299 5300 return ExDecl; 5301} 5302 5303/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5304/// handler. 5305Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5306 TypeSourceInfo *TInfo = 0; 5307 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5308 5309 bool Invalid = D.isInvalidType(); 5310 IdentifierInfo *II = D.getIdentifier(); 5311 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5312 // The scope should be freshly made just for us. There is just no way 5313 // it contains any previous declaration. 5314 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5315 if (PrevDecl->isTemplateParameter()) { 5316 // Maybe we will complain about the shadowed template parameter. 5317 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5318 } 5319 } 5320 5321 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5322 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5323 << D.getCXXScopeSpec().getRange(); 5324 Invalid = true; 5325 } 5326 5327 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5328 D.getIdentifier(), 5329 D.getIdentifierLoc(), 5330 D.getDeclSpec().getSourceRange()); 5331 5332 if (Invalid) 5333 ExDecl->setInvalidDecl(); 5334 5335 // Add the exception declaration into this scope. 5336 if (II) 5337 PushOnScopeChains(ExDecl, S); 5338 else 5339 CurContext->addDecl(ExDecl); 5340 5341 ProcessDeclAttributes(S, ExDecl, D); 5342 return DeclPtrTy::make(ExDecl); 5343} 5344 5345Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5346 ExprArg assertexpr, 5347 ExprArg assertmessageexpr) { 5348 Expr *AssertExpr = (Expr *)assertexpr.get(); 5349 StringLiteral *AssertMessage = 5350 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5351 5352 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5353 llvm::APSInt Value(32); 5354 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5355 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5356 AssertExpr->getSourceRange(); 5357 return DeclPtrTy(); 5358 } 5359 5360 if (Value == 0) { 5361 Diag(AssertLoc, diag::err_static_assert_failed) 5362 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5363 } 5364 } 5365 5366 assertexpr.release(); 5367 assertmessageexpr.release(); 5368 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5369 AssertExpr, AssertMessage); 5370 5371 CurContext->addDecl(Decl); 5372 return DeclPtrTy::make(Decl); 5373} 5374 5375/// Handle a friend type declaration. This works in tandem with 5376/// ActOnTag. 5377/// 5378/// Notes on friend class templates: 5379/// 5380/// We generally treat friend class declarations as if they were 5381/// declaring a class. So, for example, the elaborated type specifier 5382/// in a friend declaration is required to obey the restrictions of a 5383/// class-head (i.e. no typedefs in the scope chain), template 5384/// parameters are required to match up with simple template-ids, &c. 5385/// However, unlike when declaring a template specialization, it's 5386/// okay to refer to a template specialization without an empty 5387/// template parameter declaration, e.g. 5388/// friend class A<T>::B<unsigned>; 5389/// We permit this as a special case; if there are any template 5390/// parameters present at all, require proper matching, i.e. 5391/// template <> template <class T> friend class A<int>::B; 5392Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5393 MultiTemplateParamsArg TempParams) { 5394 SourceLocation Loc = DS.getSourceRange().getBegin(); 5395 5396 assert(DS.isFriendSpecified()); 5397 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5398 5399 // Try to convert the decl specifier to a type. This works for 5400 // friend templates because ActOnTag never produces a ClassTemplateDecl 5401 // for a TUK_Friend. 5402 Declarator TheDeclarator(DS, Declarator::MemberContext); 5403 TypeSourceInfo *TSI; 5404 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5405 if (TheDeclarator.isInvalidType()) 5406 return DeclPtrTy(); 5407 5408 // This is definitely an error in C++98. It's probably meant to 5409 // be forbidden in C++0x, too, but the specification is just 5410 // poorly written. 5411 // 5412 // The problem is with declarations like the following: 5413 // template <T> friend A<T>::foo; 5414 // where deciding whether a class C is a friend or not now hinges 5415 // on whether there exists an instantiation of A that causes 5416 // 'foo' to equal C. There are restrictions on class-heads 5417 // (which we declare (by fiat) elaborated friend declarations to 5418 // be) that makes this tractable. 5419 // 5420 // FIXME: handle "template <> friend class A<T>;", which 5421 // is possibly well-formed? Who even knows? 5422 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5423 Diag(Loc, diag::err_tagless_friend_type_template) 5424 << DS.getSourceRange(); 5425 return DeclPtrTy(); 5426 } 5427 5428 // C++ [class.friend]p2: 5429 // An elaborated-type-specifier shall be used in a friend declaration 5430 // for a class.* 5431 // * The class-key of the elaborated-type-specifier is required. 5432 // This is one of the rare places in Clang where it's legitimate to 5433 // ask about the "spelling" of the type. 5434 if (!getLangOptions().CPlusPlus0x && !T->isElaboratedTypeSpecifier()) { 5435 // If we evaluated the type to a record type, suggest putting 5436 // a tag in front. 5437 if (const RecordType *RT = T->getAs<RecordType>()) { 5438 RecordDecl *RD = RT->getDecl(); 5439 5440 std::string InsertionText = std::string(" ") + RD->getKindName(); 5441 5442 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5443 << (unsigned) RD->getTagKind() 5444 << T 5445 << SourceRange(DS.getFriendSpecLoc()) 5446 << FixItHint::CreateInsertion(DS.getTypeSpecTypeLoc(), InsertionText); 5447 return DeclPtrTy(); 5448 }else { 5449 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5450 << DS.getSourceRange(); 5451 return DeclPtrTy(); 5452 } 5453 } 5454 5455 // Enum types cannot be friends. 5456 if (T->getAs<EnumType>()) { 5457 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5458 << SourceRange(DS.getFriendSpecLoc()); 5459 return DeclPtrTy(); 5460 } 5461 5462 // C++98 [class.friend]p1: A friend of a class is a function 5463 // or class that is not a member of the class . . . 5464 // This is fixed in DR77, which just barely didn't make the C++03 5465 // deadline. It's also a very silly restriction that seriously 5466 // affects inner classes and which nobody else seems to implement; 5467 // thus we never diagnose it, not even in -pedantic. 5468 // 5469 // But note that we could warn about it: it's always useless to 5470 // friend one of your own members (it's not, however, worthless to 5471 // friend a member of an arbitrary specialization of your template). 5472 5473 Decl *D; 5474 if (TempParams.size()) 5475 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5476 TempParams.size(), 5477 (TemplateParameterList**) TempParams.release(), 5478 TSI, 5479 DS.getFriendSpecLoc()); 5480 else 5481 D = FriendDecl::Create(Context, CurContext, Loc, TSI, 5482 DS.getFriendSpecLoc()); 5483 D->setAccess(AS_public); 5484 CurContext->addDecl(D); 5485 5486 return DeclPtrTy::make(D); 5487} 5488 5489Sema::DeclPtrTy 5490Sema::ActOnFriendFunctionDecl(Scope *S, 5491 Declarator &D, 5492 bool IsDefinition, 5493 MultiTemplateParamsArg TemplateParams) { 5494 const DeclSpec &DS = D.getDeclSpec(); 5495 5496 assert(DS.isFriendSpecified()); 5497 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5498 5499 SourceLocation Loc = D.getIdentifierLoc(); 5500 TypeSourceInfo *TInfo = 0; 5501 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5502 5503 // C++ [class.friend]p1 5504 // A friend of a class is a function or class.... 5505 // Note that this sees through typedefs, which is intended. 5506 // It *doesn't* see through dependent types, which is correct 5507 // according to [temp.arg.type]p3: 5508 // If a declaration acquires a function type through a 5509 // type dependent on a template-parameter and this causes 5510 // a declaration that does not use the syntactic form of a 5511 // function declarator to have a function type, the program 5512 // is ill-formed. 5513 if (!T->isFunctionType()) { 5514 Diag(Loc, diag::err_unexpected_friend); 5515 5516 // It might be worthwhile to try to recover by creating an 5517 // appropriate declaration. 5518 return DeclPtrTy(); 5519 } 5520 5521 // C++ [namespace.memdef]p3 5522 // - If a friend declaration in a non-local class first declares a 5523 // class or function, the friend class or function is a member 5524 // of the innermost enclosing namespace. 5525 // - The name of the friend is not found by simple name lookup 5526 // until a matching declaration is provided in that namespace 5527 // scope (either before or after the class declaration granting 5528 // friendship). 5529 // - If a friend function is called, its name may be found by the 5530 // name lookup that considers functions from namespaces and 5531 // classes associated with the types of the function arguments. 5532 // - When looking for a prior declaration of a class or a function 5533 // declared as a friend, scopes outside the innermost enclosing 5534 // namespace scope are not considered. 5535 5536 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5537 DeclarationName Name = GetNameForDeclarator(D); 5538 assert(Name); 5539 5540 // The context we found the declaration in, or in which we should 5541 // create the declaration. 5542 DeclContext *DC; 5543 5544 // FIXME: handle local classes 5545 5546 // Recover from invalid scope qualifiers as if they just weren't there. 5547 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5548 ForRedeclaration); 5549 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5550 // FIXME: RequireCompleteDeclContext 5551 DC = computeDeclContext(ScopeQual); 5552 5553 // FIXME: handle dependent contexts 5554 if (!DC) return DeclPtrTy(); 5555 5556 LookupQualifiedName(Previous, DC); 5557 5558 // If searching in that context implicitly found a declaration in 5559 // a different context, treat it like it wasn't found at all. 5560 // TODO: better diagnostics for this case. Suggesting the right 5561 // qualified scope would be nice... 5562 // FIXME: getRepresentativeDecl() is not right here at all 5563 if (Previous.empty() || 5564 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5565 D.setInvalidType(); 5566 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5567 return DeclPtrTy(); 5568 } 5569 5570 // C++ [class.friend]p1: A friend of a class is a function or 5571 // class that is not a member of the class . . . 5572 if (DC->Equals(CurContext)) 5573 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5574 5575 // Otherwise walk out to the nearest namespace scope looking for matches. 5576 } else { 5577 // TODO: handle local class contexts. 5578 5579 DC = CurContext; 5580 while (true) { 5581 // Skip class contexts. If someone can cite chapter and verse 5582 // for this behavior, that would be nice --- it's what GCC and 5583 // EDG do, and it seems like a reasonable intent, but the spec 5584 // really only says that checks for unqualified existing 5585 // declarations should stop at the nearest enclosing namespace, 5586 // not that they should only consider the nearest enclosing 5587 // namespace. 5588 while (DC->isRecord()) 5589 DC = DC->getParent(); 5590 5591 LookupQualifiedName(Previous, DC); 5592 5593 // TODO: decide what we think about using declarations. 5594 if (!Previous.empty()) 5595 break; 5596 5597 if (DC->isFileContext()) break; 5598 DC = DC->getParent(); 5599 } 5600 5601 // C++ [class.friend]p1: A friend of a class is a function or 5602 // class that is not a member of the class . . . 5603 // C++0x changes this for both friend types and functions. 5604 // Most C++ 98 compilers do seem to give an error here, so 5605 // we do, too. 5606 if (!Previous.empty() && DC->Equals(CurContext) 5607 && !getLangOptions().CPlusPlus0x) 5608 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5609 } 5610 5611 if (DC->isFileContext()) { 5612 // This implies that it has to be an operator or function. 5613 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5614 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5615 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5616 Diag(Loc, diag::err_introducing_special_friend) << 5617 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5618 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5619 return DeclPtrTy(); 5620 } 5621 } 5622 5623 bool Redeclaration = false; 5624 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5625 move(TemplateParams), 5626 IsDefinition, 5627 Redeclaration); 5628 if (!ND) return DeclPtrTy(); 5629 5630 assert(ND->getDeclContext() == DC); 5631 assert(ND->getLexicalDeclContext() == CurContext); 5632 5633 // Add the function declaration to the appropriate lookup tables, 5634 // adjusting the redeclarations list as necessary. We don't 5635 // want to do this yet if the friending class is dependent. 5636 // 5637 // Also update the scope-based lookup if the target context's 5638 // lookup context is in lexical scope. 5639 if (!CurContext->isDependentContext()) { 5640 DC = DC->getLookupContext(); 5641 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5642 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5643 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5644 } 5645 5646 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5647 D.getIdentifierLoc(), ND, 5648 DS.getFriendSpecLoc()); 5649 FrD->setAccess(AS_public); 5650 CurContext->addDecl(FrD); 5651 5652 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5653 FrD->setSpecialization(true); 5654 5655 return DeclPtrTy::make(ND); 5656} 5657 5658void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5659 AdjustDeclIfTemplate(dcl); 5660 5661 Decl *Dcl = dcl.getAs<Decl>(); 5662 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5663 if (!Fn) { 5664 Diag(DelLoc, diag::err_deleted_non_function); 5665 return; 5666 } 5667 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5668 Diag(DelLoc, diag::err_deleted_decl_not_first); 5669 Diag(Prev->getLocation(), diag::note_previous_declaration); 5670 // If the declaration wasn't the first, we delete the function anyway for 5671 // recovery. 5672 } 5673 Fn->setDeleted(); 5674} 5675 5676static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5677 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5678 ++CI) { 5679 Stmt *SubStmt = *CI; 5680 if (!SubStmt) 5681 continue; 5682 if (isa<ReturnStmt>(SubStmt)) 5683 Self.Diag(SubStmt->getSourceRange().getBegin(), 5684 diag::err_return_in_constructor_handler); 5685 if (!isa<Expr>(SubStmt)) 5686 SearchForReturnInStmt(Self, SubStmt); 5687 } 5688} 5689 5690void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5691 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5692 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5693 SearchForReturnInStmt(*this, Handler); 5694 } 5695} 5696 5697bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5698 const CXXMethodDecl *Old) { 5699 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5700 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5701 5702 if (Context.hasSameType(NewTy, OldTy) || 5703 NewTy->isDependentType() || OldTy->isDependentType()) 5704 return false; 5705 5706 // Check if the return types are covariant 5707 QualType NewClassTy, OldClassTy; 5708 5709 /// Both types must be pointers or references to classes. 5710 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5711 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5712 NewClassTy = NewPT->getPointeeType(); 5713 OldClassTy = OldPT->getPointeeType(); 5714 } 5715 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5716 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5717 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5718 NewClassTy = NewRT->getPointeeType(); 5719 OldClassTy = OldRT->getPointeeType(); 5720 } 5721 } 5722 } 5723 5724 // The return types aren't either both pointers or references to a class type. 5725 if (NewClassTy.isNull()) { 5726 Diag(New->getLocation(), 5727 diag::err_different_return_type_for_overriding_virtual_function) 5728 << New->getDeclName() << NewTy << OldTy; 5729 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5730 5731 return true; 5732 } 5733 5734 // C++ [class.virtual]p6: 5735 // If the return type of D::f differs from the return type of B::f, the 5736 // class type in the return type of D::f shall be complete at the point of 5737 // declaration of D::f or shall be the class type D. 5738 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5739 if (!RT->isBeingDefined() && 5740 RequireCompleteType(New->getLocation(), NewClassTy, 5741 PDiag(diag::err_covariant_return_incomplete) 5742 << New->getDeclName())) 5743 return true; 5744 } 5745 5746 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5747 // Check if the new class derives from the old class. 5748 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5749 Diag(New->getLocation(), 5750 diag::err_covariant_return_not_derived) 5751 << New->getDeclName() << NewTy << OldTy; 5752 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5753 return true; 5754 } 5755 5756 // Check if we the conversion from derived to base is valid. 5757 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5758 diag::err_covariant_return_inaccessible_base, 5759 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5760 // FIXME: Should this point to the return type? 5761 New->getLocation(), SourceRange(), New->getDeclName())) { 5762 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5763 return true; 5764 } 5765 } 5766 5767 // The qualifiers of the return types must be the same. 5768 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5769 Diag(New->getLocation(), 5770 diag::err_covariant_return_type_different_qualifications) 5771 << New->getDeclName() << NewTy << OldTy; 5772 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5773 return true; 5774 }; 5775 5776 5777 // The new class type must have the same or less qualifiers as the old type. 5778 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5779 Diag(New->getLocation(), 5780 diag::err_covariant_return_type_class_type_more_qualified) 5781 << New->getDeclName() << NewTy << OldTy; 5782 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5783 return true; 5784 }; 5785 5786 return false; 5787} 5788 5789bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5790 const CXXMethodDecl *Old) 5791{ 5792 if (Old->hasAttr<FinalAttr>()) { 5793 Diag(New->getLocation(), diag::err_final_function_overridden) 5794 << New->getDeclName(); 5795 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5796 return true; 5797 } 5798 5799 return false; 5800} 5801 5802/// \brief Mark the given method pure. 5803/// 5804/// \param Method the method to be marked pure. 5805/// 5806/// \param InitRange the source range that covers the "0" initializer. 5807bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5808 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5809 Method->setPure(); 5810 5811 // A class is abstract if at least one function is pure virtual. 5812 Method->getParent()->setAbstract(true); 5813 return false; 5814 } 5815 5816 if (!Method->isInvalidDecl()) 5817 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5818 << Method->getDeclName() << InitRange; 5819 return true; 5820} 5821 5822/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5823/// an initializer for the out-of-line declaration 'Dcl'. The scope 5824/// is a fresh scope pushed for just this purpose. 5825/// 5826/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5827/// static data member of class X, names should be looked up in the scope of 5828/// class X. 5829void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5830 // If there is no declaration, there was an error parsing it. 5831 Decl *D = Dcl.getAs<Decl>(); 5832 if (D == 0) return; 5833 5834 // We should only get called for declarations with scope specifiers, like: 5835 // int foo::bar; 5836 assert(D->isOutOfLine()); 5837 EnterDeclaratorContext(S, D->getDeclContext()); 5838} 5839 5840/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5841/// initializer for the out-of-line declaration 'Dcl'. 5842void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5843 // If there is no declaration, there was an error parsing it. 5844 Decl *D = Dcl.getAs<Decl>(); 5845 if (D == 0) return; 5846 5847 assert(D->isOutOfLine()); 5848 ExitDeclaratorContext(S); 5849} 5850 5851/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5852/// C++ if/switch/while/for statement. 5853/// e.g: "if (int x = f()) {...}" 5854Action::DeclResult 5855Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5856 // C++ 6.4p2: 5857 // The declarator shall not specify a function or an array. 5858 // The type-specifier-seq shall not contain typedef and shall not declare a 5859 // new class or enumeration. 5860 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5861 "Parser allowed 'typedef' as storage class of condition decl."); 5862 5863 TypeSourceInfo *TInfo = 0; 5864 TagDecl *OwnedTag = 0; 5865 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5866 5867 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5868 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5869 // would be created and CXXConditionDeclExpr wants a VarDecl. 5870 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5871 << D.getSourceRange(); 5872 return DeclResult(); 5873 } else if (OwnedTag && OwnedTag->isDefinition()) { 5874 // The type-specifier-seq shall not declare a new class or enumeration. 5875 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5876 } 5877 5878 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5879 if (!Dcl) 5880 return DeclResult(); 5881 5882 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5883 VD->setDeclaredInCondition(true); 5884 return Dcl; 5885} 5886 5887static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5888 // Ignore dependent types. 5889 if (MD->isDependentContext()) 5890 return false; 5891 5892 // Ignore declarations that are not definitions. 5893 if (!MD->isThisDeclarationADefinition()) 5894 return false; 5895 5896 CXXRecordDecl *RD = MD->getParent(); 5897 5898 // Ignore classes without a vtable. 5899 if (!RD->isDynamicClass()) 5900 return false; 5901 5902 switch (MD->getParent()->getTemplateSpecializationKind()) { 5903 case TSK_Undeclared: 5904 case TSK_ExplicitSpecialization: 5905 // Classes that aren't instantiations of templates don't need their 5906 // virtual methods marked until we see the definition of the key 5907 // function. 5908 break; 5909 5910 case TSK_ImplicitInstantiation: 5911 // This is a constructor of a class template; mark all of the virtual 5912 // members as referenced to ensure that they get instantiatied. 5913 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5914 return true; 5915 break; 5916 5917 case TSK_ExplicitInstantiationDeclaration: 5918 return false; 5919 5920 case TSK_ExplicitInstantiationDefinition: 5921 // This is method of a explicit instantiation; mark all of the virtual 5922 // members as referenced to ensure that they get instantiatied. 5923 return true; 5924 } 5925 5926 // Consider only out-of-line definitions of member functions. When we see 5927 // an inline definition, it's too early to compute the key function. 5928 if (!MD->isOutOfLine()) 5929 return false; 5930 5931 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5932 5933 // If there is no key function, we will need a copy of the vtable. 5934 if (!KeyFunction) 5935 return true; 5936 5937 // If this is the key function, we need to mark virtual members. 5938 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5939 return true; 5940 5941 return false; 5942} 5943 5944void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5945 CXXMethodDecl *MD) { 5946 CXXRecordDecl *RD = MD->getParent(); 5947 5948 // We will need to mark all of the virtual members as referenced to build the 5949 // vtable. 5950 if (!needsVtable(MD, Context)) 5951 return; 5952 5953 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5954 if (kind == TSK_ImplicitInstantiation) 5955 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5956 else 5957 MarkVirtualMembersReferenced(Loc, RD); 5958} 5959 5960bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5961 if (ClassesWithUnmarkedVirtualMembers.empty()) 5962 return false; 5963 5964 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5965 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5966 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5967 ClassesWithUnmarkedVirtualMembers.pop_back(); 5968 MarkVirtualMembersReferenced(Loc, RD); 5969 } 5970 5971 return true; 5972} 5973 5974void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5975 const CXXRecordDecl *RD) { 5976 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5977 e = RD->method_end(); i != e; ++i) { 5978 CXXMethodDecl *MD = *i; 5979 5980 // C++ [basic.def.odr]p2: 5981 // [...] A virtual member function is used if it is not pure. [...] 5982 if (MD->isVirtual() && !MD->isPure()) 5983 MarkDeclarationReferenced(Loc, MD); 5984 } 5985 5986 // Only classes that have virtual bases need a VTT. 5987 if (RD->getNumVBases() == 0) 5988 return; 5989 5990 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5991 e = RD->bases_end(); i != e; ++i) { 5992 const CXXRecordDecl *Base = 5993 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5994 if (i->isVirtual()) 5995 continue; 5996 if (Base->getNumVBases() == 0) 5997 continue; 5998 MarkVirtualMembersReferenced(Loc, Base); 5999 } 6000} 6001