SemaDeclCXX.cpp revision ec3332bcae6466dc69227742d2c4145fbe88e975
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 AnyErrors) { 1433// assert((Constructor->isImplicit() == IsImplicitConstructor)); 1434 1435 // We need to build the initializer AST according to order of construction 1436 // and not what user specified in the Initializers list. 1437 CXXRecordDecl *ClassDecl 1438 = cast<CXXRecordDecl>(Constructor->getDeclContext())->getDefinition(); 1439 if (!ClassDecl) 1440 return true; 1441 1442 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1443 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1444 bool HasDependentBaseInit = false; 1445 bool HadError = false; 1446 1447 for (unsigned i = 0; i < NumInitializers; i++) { 1448 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1449 if (Member->isBaseInitializer()) { 1450 if (Member->getBaseClass()->isDependentType()) 1451 HasDependentBaseInit = true; 1452 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1453 } else { 1454 AllBaseFields[Member->getMember()] = Member; 1455 } 1456 } 1457 1458 if (HasDependentBaseInit) { 1459 // FIXME. This does not preserve the ordering of the initializers. 1460 // Try (with -Wreorder) 1461 // template<class X> struct A {}; 1462 // template<class X> struct B : A<X> { 1463 // B() : x1(10), A<X>() {} 1464 // int x1; 1465 // }; 1466 // B<int> x; 1467 // On seeing one dependent type, we should essentially exit this routine 1468 // while preserving user-declared initializer list. When this routine is 1469 // called during instantiatiation process, this routine will rebuild the 1470 // ordered initializer list correctly. 1471 1472 // If we have a dependent base initialization, we can't determine the 1473 // association between initializers and bases; just dump the known 1474 // initializers into the list, and don't try to deal with other bases. 1475 for (unsigned i = 0; i < NumInitializers; i++) { 1476 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1477 if (Member->isBaseInitializer()) 1478 AllToInit.push_back(Member); 1479 } 1480 } else { 1481 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1482 1483 // Push virtual bases before others. 1484 for (CXXRecordDecl::base_class_iterator VBase = 1485 ClassDecl->vbases_begin(), 1486 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1487 if (VBase->getType()->isDependentType()) 1488 continue; 1489 if (CXXBaseOrMemberInitializer *Value 1490 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1491 AllToInit.push_back(Value); 1492 } else if (!AnyErrors) { 1493 InitializedEntity InitEntity 1494 = InitializedEntity::InitializeBase(Context, VBase); 1495 InitializationKind InitKind 1496 = InitializationKind::CreateDefault(Constructor->getLocation()); 1497 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1498 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1499 MultiExprArg(*this, 0, 0)); 1500 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1501 if (BaseInit.isInvalid()) { 1502 HadError = true; 1503 continue; 1504 } 1505 1506 // Don't attach synthesized base initializers in a dependent 1507 // context; they'll be checked again at template instantiation 1508 // time. 1509 if (CurContext->isDependentContext()) 1510 continue; 1511 1512 CXXBaseOrMemberInitializer *CXXBaseInit = 1513 new (Context) CXXBaseOrMemberInitializer(Context, 1514 Context.getTrivialTypeSourceInfo(VBase->getType(), 1515 SourceLocation()), 1516 SourceLocation(), 1517 BaseInit.takeAs<Expr>(), 1518 SourceLocation()); 1519 AllToInit.push_back(CXXBaseInit); 1520 } 1521 } 1522 1523 for (CXXRecordDecl::base_class_iterator Base = 1524 ClassDecl->bases_begin(), 1525 E = ClassDecl->bases_end(); Base != E; ++Base) { 1526 // Virtuals are in the virtual base list and already constructed. 1527 if (Base->isVirtual()) 1528 continue; 1529 // Skip dependent types. 1530 if (Base->getType()->isDependentType()) 1531 continue; 1532 if (CXXBaseOrMemberInitializer *Value 1533 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1534 AllToInit.push_back(Value); 1535 } 1536 else if (!AnyErrors) { 1537 InitializedEntity InitEntity 1538 = InitializedEntity::InitializeBase(Context, Base); 1539 InitializationKind InitKind 1540 = InitializationKind::CreateDefault(Constructor->getLocation()); 1541 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1542 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1543 MultiExprArg(*this, 0, 0)); 1544 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1545 if (BaseInit.isInvalid()) { 1546 HadError = true; 1547 continue; 1548 } 1549 1550 // Don't attach synthesized base initializers in a dependent 1551 // context; they'll be regenerated at template instantiation 1552 // time. 1553 if (CurContext->isDependentContext()) 1554 continue; 1555 1556 CXXBaseOrMemberInitializer *CXXBaseInit = 1557 new (Context) CXXBaseOrMemberInitializer(Context, 1558 Context.getTrivialTypeSourceInfo(Base->getType(), 1559 SourceLocation()), 1560 SourceLocation(), 1561 BaseInit.takeAs<Expr>(), 1562 SourceLocation()); 1563 AllToInit.push_back(CXXBaseInit); 1564 } 1565 } 1566 } 1567 1568 // non-static data members. 1569 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1570 E = ClassDecl->field_end(); Field != E; ++Field) { 1571 if ((*Field)->isAnonymousStructOrUnion()) { 1572 if (const RecordType *FieldClassType = 1573 Field->getType()->getAs<RecordType>()) { 1574 CXXRecordDecl *FieldClassDecl 1575 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1576 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1577 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1578 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1579 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1580 // set to the anonymous union data member used in the initializer 1581 // list. 1582 Value->setMember(*Field); 1583 Value->setAnonUnionMember(*FA); 1584 AllToInit.push_back(Value); 1585 break; 1586 } 1587 } 1588 } 1589 continue; 1590 } 1591 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1592 AllToInit.push_back(Value); 1593 continue; 1594 } 1595 1596 if ((*Field)->getType()->isDependentType() || AnyErrors) 1597 continue; 1598 1599 QualType FT = Context.getBaseElementType((*Field)->getType()); 1600 if (FT->getAs<RecordType>()) { 1601 InitializedEntity InitEntity 1602 = InitializedEntity::InitializeMember(*Field); 1603 InitializationKind InitKind 1604 = InitializationKind::CreateDefault(Constructor->getLocation()); 1605 1606 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1607 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1608 MultiExprArg(*this, 0, 0)); 1609 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1610 if (MemberInit.isInvalid()) { 1611 HadError = true; 1612 continue; 1613 } 1614 1615 // Don't attach synthesized member initializers in a dependent 1616 // context; they'll be regenerated a template instantiation 1617 // time. 1618 if (CurContext->isDependentContext()) 1619 continue; 1620 1621 CXXBaseOrMemberInitializer *Member = 1622 new (Context) CXXBaseOrMemberInitializer(Context, 1623 *Field, SourceLocation(), 1624 SourceLocation(), 1625 MemberInit.takeAs<Expr>(), 1626 SourceLocation()); 1627 1628 AllToInit.push_back(Member); 1629 } 1630 else if (FT->isReferenceType()) { 1631 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1632 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1633 << 0 << (*Field)->getDeclName(); 1634 Diag((*Field)->getLocation(), diag::note_declared_at); 1635 HadError = true; 1636 } 1637 else if (FT.isConstQualified()) { 1638 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1639 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1640 << 1 << (*Field)->getDeclName(); 1641 Diag((*Field)->getLocation(), diag::note_declared_at); 1642 HadError = true; 1643 } 1644 } 1645 1646 NumInitializers = AllToInit.size(); 1647 if (NumInitializers > 0) { 1648 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1649 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1650 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1651 memcpy(baseOrMemberInitializers, AllToInit.data(), 1652 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1653 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1654 1655 // Constructors implicitly reference the base and member 1656 // destructors. 1657 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1658 Constructor->getParent()); 1659 } 1660 1661 return HadError; 1662} 1663 1664static void *GetKeyForTopLevelField(FieldDecl *Field) { 1665 // For anonymous unions, use the class declaration as the key. 1666 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1667 if (RT->getDecl()->isAnonymousStructOrUnion()) 1668 return static_cast<void *>(RT->getDecl()); 1669 } 1670 return static_cast<void *>(Field); 1671} 1672 1673static void *GetKeyForBase(QualType BaseType) { 1674 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1675 return (void *)RT; 1676 1677 assert(0 && "Unexpected base type!"); 1678 return 0; 1679} 1680 1681static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1682 bool MemberMaybeAnon = false) { 1683 if (!Member->isMemberInitializer()) 1684 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1685 1686 // For fields injected into the class via declaration of an anonymous union, 1687 // use its anonymous union class declaration as the unique key. 1688 FieldDecl *Field = Member->getMember(); 1689 1690 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1691 // data member of the class. Data member used in the initializer list is 1692 // in AnonUnionMember field. 1693 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1694 Field = Member->getAnonUnionMember(); 1695 1696 // If the field is a member of an anonymous union, we use record decl of the 1697 // union as the key. 1698 RecordDecl *RD = Field->getParent(); 1699 if (RD->isAnonymousStructOrUnion() && RD->isUnion()) 1700 return static_cast<void *>(RD); 1701 1702 return static_cast<void *>(Field); 1703} 1704 1705static void 1706DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1707 const CXXConstructorDecl *Constructor, 1708 CXXBaseOrMemberInitializer **MemInits, 1709 unsigned NumMemInits) { 1710 if (Constructor->isDependentContext()) 1711 return; 1712 1713 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1714 Diagnostic::Ignored && 1715 SemaRef.Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1716 Diagnostic::Ignored) 1717 return; 1718 1719 // Also issue warning if order of ctor-initializer list does not match order 1720 // of 1) base class declarations and 2) order of non-static data members. 1721 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1722 1723 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1724 1725 // Push virtual bases before others. 1726 for (CXXRecordDecl::base_class_const_iterator VBase = 1727 ClassDecl->vbases_begin(), 1728 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1729 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1730 1731 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1732 E = ClassDecl->bases_end(); Base != E; ++Base) { 1733 // Virtuals are alread in the virtual base list and are constructed 1734 // first. 1735 if (Base->isVirtual()) 1736 continue; 1737 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1738 } 1739 1740 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1741 E = ClassDecl->field_end(); Field != E; ++Field) 1742 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1743 1744 int Last = AllBaseOrMembers.size(); 1745 int curIndex = 0; 1746 CXXBaseOrMemberInitializer *PrevMember = 0; 1747 for (unsigned i = 0; i < NumMemInits; i++) { 1748 CXXBaseOrMemberInitializer *Member = MemInits[i]; 1749 void *MemberInCtorList = GetKeyForMember(Member, true); 1750 1751 for (; curIndex < Last; curIndex++) 1752 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1753 break; 1754 if (curIndex == Last) { 1755 assert(PrevMember && "Member not in member list?!"); 1756 // Initializer as specified in ctor-initializer list is out of order. 1757 // Issue a warning diagnostic. 1758 if (PrevMember->isBaseInitializer()) { 1759 // Diagnostics is for an initialized base class. 1760 Type *BaseClass = PrevMember->getBaseClass(); 1761 SemaRef.Diag(PrevMember->getSourceLocation(), 1762 diag::warn_base_initialized) 1763 << QualType(BaseClass, 0); 1764 } else { 1765 FieldDecl *Field = PrevMember->getMember(); 1766 SemaRef.Diag(PrevMember->getSourceLocation(), 1767 diag::warn_field_initialized) 1768 << Field->getNameAsString(); 1769 } 1770 // Also the note! 1771 if (FieldDecl *Field = Member->getMember()) 1772 SemaRef.Diag(Member->getSourceLocation(), 1773 diag::note_fieldorbase_initialized_here) << 0 1774 << Field->getNameAsString(); 1775 else { 1776 Type *BaseClass = Member->getBaseClass(); 1777 SemaRef.Diag(Member->getSourceLocation(), 1778 diag::note_fieldorbase_initialized_here) << 1 1779 << QualType(BaseClass, 0); 1780 } 1781 for (curIndex = 0; curIndex < Last; curIndex++) 1782 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1783 break; 1784 } 1785 PrevMember = Member; 1786 } 1787} 1788 1789/// ActOnMemInitializers - Handle the member initializers for a constructor. 1790void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1791 SourceLocation ColonLoc, 1792 MemInitTy **meminits, unsigned NumMemInits, 1793 bool AnyErrors) { 1794 if (!ConstructorDecl) 1795 return; 1796 1797 AdjustDeclIfTemplate(ConstructorDecl); 1798 1799 CXXConstructorDecl *Constructor 1800 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1801 1802 if (!Constructor) { 1803 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1804 return; 1805 } 1806 1807 CXXBaseOrMemberInitializer **MemInits = 1808 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1809 1810 if (!Constructor->isDependentContext()) { 1811 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1812 bool err = false; 1813 for (unsigned i = 0; i < NumMemInits; i++) { 1814 CXXBaseOrMemberInitializer *Member = MemInits[i]; 1815 1816 void *KeyToMember = GetKeyForMember(Member); 1817 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1818 if (!PrevMember) { 1819 PrevMember = Member; 1820 continue; 1821 } 1822 if (FieldDecl *Field = Member->getMember()) 1823 Diag(Member->getSourceLocation(), 1824 diag::error_multiple_mem_initialization) 1825 << Field->getNameAsString() 1826 << Member->getSourceRange(); 1827 else { 1828 Type *BaseClass = Member->getBaseClass(); 1829 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1830 Diag(Member->getSourceLocation(), 1831 diag::error_multiple_base_initialization) 1832 << QualType(BaseClass, 0) 1833 << Member->getSourceRange(); 1834 } 1835 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1836 << 0; 1837 err = true; 1838 } 1839 1840 if (err) 1841 return; 1842 } 1843 1844 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1845 1846 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1847} 1848 1849void 1850Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1851 CXXRecordDecl *ClassDecl) { 1852 // Ignore dependent contexts. 1853 if (ClassDecl->isDependentContext()) 1854 return; 1855 1856 // FIXME: all the access-control diagnostics are positioned on the 1857 // field/base declaration. That's probably good; that said, the 1858 // user might reasonably want to know why the destructor is being 1859 // emitted, and we currently don't say. 1860 1861 // Non-static data members. 1862 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1863 E = ClassDecl->field_end(); I != E; ++I) { 1864 FieldDecl *Field = *I; 1865 1866 QualType FieldType = Context.getBaseElementType(Field->getType()); 1867 1868 const RecordType* RT = FieldType->getAs<RecordType>(); 1869 if (!RT) 1870 continue; 1871 1872 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1873 if (FieldClassDecl->hasTrivialDestructor()) 1874 continue; 1875 1876 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1877 CheckDestructorAccess(Field->getLocation(), Dtor, 1878 PDiag(diag::err_access_dtor_field) 1879 << Field->getDeclName() 1880 << FieldType); 1881 1882 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1883 } 1884 1885 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1886 1887 // Bases. 1888 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1889 E = ClassDecl->bases_end(); Base != E; ++Base) { 1890 // Bases are always records in a well-formed non-dependent class. 1891 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1892 1893 // Remember direct virtual bases. 1894 if (Base->isVirtual()) 1895 DirectVirtualBases.insert(RT); 1896 1897 // Ignore trivial destructors. 1898 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1899 if (BaseClassDecl->hasTrivialDestructor()) 1900 continue; 1901 1902 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1903 1904 // FIXME: caret should be on the start of the class name 1905 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1906 PDiag(diag::err_access_dtor_base) 1907 << Base->getType() 1908 << Base->getSourceRange()); 1909 1910 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1911 } 1912 1913 // Virtual bases. 1914 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1915 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1916 1917 // Bases are always records in a well-formed non-dependent class. 1918 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1919 1920 // Ignore direct virtual bases. 1921 if (DirectVirtualBases.count(RT)) 1922 continue; 1923 1924 // Ignore trivial destructors. 1925 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1926 if (BaseClassDecl->hasTrivialDestructor()) 1927 continue; 1928 1929 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1930 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1931 PDiag(diag::err_access_dtor_vbase) 1932 << VBase->getType()); 1933 1934 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1935 } 1936} 1937 1938void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1939 if (!CDtorDecl) 1940 return; 1941 1942 if (CXXConstructorDecl *Constructor 1943 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1944 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 1945} 1946 1947bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1948 unsigned DiagID, AbstractDiagSelID SelID, 1949 const CXXRecordDecl *CurrentRD) { 1950 if (SelID == -1) 1951 return RequireNonAbstractType(Loc, T, 1952 PDiag(DiagID), CurrentRD); 1953 else 1954 return RequireNonAbstractType(Loc, T, 1955 PDiag(DiagID) << SelID, CurrentRD); 1956} 1957 1958bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1959 const PartialDiagnostic &PD, 1960 const CXXRecordDecl *CurrentRD) { 1961 if (!getLangOptions().CPlusPlus) 1962 return false; 1963 1964 if (const ArrayType *AT = Context.getAsArrayType(T)) 1965 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1966 CurrentRD); 1967 1968 if (const PointerType *PT = T->getAs<PointerType>()) { 1969 // Find the innermost pointer type. 1970 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1971 PT = T; 1972 1973 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1974 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1975 } 1976 1977 const RecordType *RT = T->getAs<RecordType>(); 1978 if (!RT) 1979 return false; 1980 1981 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 1982 1983 if (CurrentRD && CurrentRD != RD) 1984 return false; 1985 1986 // FIXME: is this reasonable? It matches current behavior, but.... 1987 if (!RD->getDefinition()) 1988 return false; 1989 1990 if (!RD->isAbstract()) 1991 return false; 1992 1993 Diag(Loc, PD) << RD->getDeclName(); 1994 1995 // Check if we've already emitted the list of pure virtual functions for this 1996 // class. 1997 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1998 return true; 1999 2000 CXXFinalOverriderMap FinalOverriders; 2001 RD->getFinalOverriders(FinalOverriders); 2002 2003 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2004 MEnd = FinalOverriders.end(); 2005 M != MEnd; 2006 ++M) { 2007 for (OverridingMethods::iterator SO = M->second.begin(), 2008 SOEnd = M->second.end(); 2009 SO != SOEnd; ++SO) { 2010 // C++ [class.abstract]p4: 2011 // A class is abstract if it contains or inherits at least one 2012 // pure virtual function for which the final overrider is pure 2013 // virtual. 2014 2015 // 2016 if (SO->second.size() != 1) 2017 continue; 2018 2019 if (!SO->second.front().Method->isPure()) 2020 continue; 2021 2022 Diag(SO->second.front().Method->getLocation(), 2023 diag::note_pure_virtual_function) 2024 << SO->second.front().Method->getDeclName(); 2025 } 2026 } 2027 2028 if (!PureVirtualClassDiagSet) 2029 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2030 PureVirtualClassDiagSet->insert(RD); 2031 2032 return true; 2033} 2034 2035namespace { 2036 class AbstractClassUsageDiagnoser 2037 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2038 Sema &SemaRef; 2039 CXXRecordDecl *AbstractClass; 2040 2041 bool VisitDeclContext(const DeclContext *DC) { 2042 bool Invalid = false; 2043 2044 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2045 E = DC->decls_end(); I != E; ++I) 2046 Invalid |= Visit(*I); 2047 2048 return Invalid; 2049 } 2050 2051 public: 2052 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2053 : SemaRef(SemaRef), AbstractClass(ac) { 2054 Visit(SemaRef.Context.getTranslationUnitDecl()); 2055 } 2056 2057 bool VisitFunctionDecl(const FunctionDecl *FD) { 2058 if (FD->isThisDeclarationADefinition()) { 2059 // No need to do the check if we're in a definition, because it requires 2060 // that the return/param types are complete. 2061 // because that requires 2062 return VisitDeclContext(FD); 2063 } 2064 2065 // Check the return type. 2066 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2067 bool Invalid = 2068 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2069 diag::err_abstract_type_in_decl, 2070 Sema::AbstractReturnType, 2071 AbstractClass); 2072 2073 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2074 E = FD->param_end(); I != E; ++I) { 2075 const ParmVarDecl *VD = *I; 2076 Invalid |= 2077 SemaRef.RequireNonAbstractType(VD->getLocation(), 2078 VD->getOriginalType(), 2079 diag::err_abstract_type_in_decl, 2080 Sema::AbstractParamType, 2081 AbstractClass); 2082 } 2083 2084 return Invalid; 2085 } 2086 2087 bool VisitDecl(const Decl* D) { 2088 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2089 return VisitDeclContext(DC); 2090 2091 return false; 2092 } 2093 }; 2094} 2095 2096/// \brief Perform semantic checks on a class definition that has been 2097/// completing, introducing implicitly-declared members, checking for 2098/// abstract types, etc. 2099void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2100 if (!Record || Record->isInvalidDecl()) 2101 return; 2102 2103 if (!Record->isDependentType()) 2104 AddImplicitlyDeclaredMembersToClass(Record); 2105 2106 if (Record->isInvalidDecl()) 2107 return; 2108 2109 // Set access bits correctly on the directly-declared conversions. 2110 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2111 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2112 Convs->setAccess(I, (*I)->getAccess()); 2113 2114 // Determine whether we need to check for final overriders. We do 2115 // this either when there are virtual base classes (in which case we 2116 // may end up finding multiple final overriders for a given virtual 2117 // function) or any of the base classes is abstract (in which case 2118 // we might detect that this class is abstract). 2119 bool CheckFinalOverriders = false; 2120 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2121 !Record->isDependentType()) { 2122 if (Record->getNumVBases()) 2123 CheckFinalOverriders = true; 2124 else if (!Record->isAbstract()) { 2125 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2126 BEnd = Record->bases_end(); 2127 B != BEnd; ++B) { 2128 CXXRecordDecl *BaseDecl 2129 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2130 if (BaseDecl->isAbstract()) { 2131 CheckFinalOverriders = true; 2132 break; 2133 } 2134 } 2135 } 2136 } 2137 2138 if (CheckFinalOverriders) { 2139 CXXFinalOverriderMap FinalOverriders; 2140 Record->getFinalOverriders(FinalOverriders); 2141 2142 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2143 MEnd = FinalOverriders.end(); 2144 M != MEnd; ++M) { 2145 for (OverridingMethods::iterator SO = M->second.begin(), 2146 SOEnd = M->second.end(); 2147 SO != SOEnd; ++SO) { 2148 assert(SO->second.size() > 0 && 2149 "All virtual functions have overridding virtual functions"); 2150 if (SO->second.size() == 1) { 2151 // C++ [class.abstract]p4: 2152 // A class is abstract if it contains or inherits at least one 2153 // pure virtual function for which the final overrider is pure 2154 // virtual. 2155 if (SO->second.front().Method->isPure()) 2156 Record->setAbstract(true); 2157 continue; 2158 } 2159 2160 // C++ [class.virtual]p2: 2161 // In a derived class, if a virtual member function of a base 2162 // class subobject has more than one final overrider the 2163 // program is ill-formed. 2164 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2165 << (NamedDecl *)M->first << Record; 2166 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2167 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2168 OMEnd = SO->second.end(); 2169 OM != OMEnd; ++OM) 2170 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2171 << (NamedDecl *)M->first << OM->Method->getParent(); 2172 2173 Record->setInvalidDecl(); 2174 } 2175 } 2176 } 2177 2178 if (Record->isAbstract() && !Record->isInvalidDecl()) 2179 (void)AbstractClassUsageDiagnoser(*this, Record); 2180} 2181 2182void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2183 DeclPtrTy TagDecl, 2184 SourceLocation LBrac, 2185 SourceLocation RBrac, 2186 AttributeList *AttrList) { 2187 if (!TagDecl) 2188 return; 2189 2190 AdjustDeclIfTemplate(TagDecl); 2191 2192 ActOnFields(S, RLoc, TagDecl, 2193 (DeclPtrTy*)FieldCollector->getCurFields(), 2194 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2195 2196 CheckCompletedCXXClass( 2197 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2198} 2199 2200/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2201/// special functions, such as the default constructor, copy 2202/// constructor, or destructor, to the given C++ class (C++ 2203/// [special]p1). This routine can only be executed just before the 2204/// definition of the class is complete. 2205void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2206 CanQualType ClassType 2207 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2208 2209 // FIXME: Implicit declarations have exception specifications, which are 2210 // the union of the specifications of the implicitly called functions. 2211 2212 if (!ClassDecl->hasUserDeclaredConstructor()) { 2213 // C++ [class.ctor]p5: 2214 // A default constructor for a class X is a constructor of class X 2215 // that can be called without an argument. If there is no 2216 // user-declared constructor for class X, a default constructor is 2217 // implicitly declared. An implicitly-declared default constructor 2218 // is an inline public member of its class. 2219 DeclarationName Name 2220 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2221 CXXConstructorDecl *DefaultCon = 2222 CXXConstructorDecl::Create(Context, ClassDecl, 2223 ClassDecl->getLocation(), Name, 2224 Context.getFunctionType(Context.VoidTy, 2225 0, 0, false, 0, 2226 /*FIXME*/false, false, 2227 0, 0, 2228 FunctionType::ExtInfo()), 2229 /*TInfo=*/0, 2230 /*isExplicit=*/false, 2231 /*isInline=*/true, 2232 /*isImplicitlyDeclared=*/true); 2233 DefaultCon->setAccess(AS_public); 2234 DefaultCon->setImplicit(); 2235 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2236 ClassDecl->addDecl(DefaultCon); 2237 } 2238 2239 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2240 // C++ [class.copy]p4: 2241 // If the class definition does not explicitly declare a copy 2242 // constructor, one is declared implicitly. 2243 2244 // C++ [class.copy]p5: 2245 // The implicitly-declared copy constructor for a class X will 2246 // have the form 2247 // 2248 // X::X(const X&) 2249 // 2250 // if 2251 bool HasConstCopyConstructor = true; 2252 2253 // -- each direct or virtual base class B of X has a copy 2254 // constructor whose first parameter is of type const B& or 2255 // const volatile B&, and 2256 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2257 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2258 const CXXRecordDecl *BaseClassDecl 2259 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2260 HasConstCopyConstructor 2261 = BaseClassDecl->hasConstCopyConstructor(Context); 2262 } 2263 2264 // -- for all the nonstatic data members of X that are of a 2265 // class type M (or array thereof), each such class type 2266 // has a copy constructor whose first parameter is of type 2267 // const M& or const volatile M&. 2268 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2269 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2270 ++Field) { 2271 QualType FieldType = (*Field)->getType(); 2272 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2273 FieldType = Array->getElementType(); 2274 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2275 const CXXRecordDecl *FieldClassDecl 2276 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2277 HasConstCopyConstructor 2278 = FieldClassDecl->hasConstCopyConstructor(Context); 2279 } 2280 } 2281 2282 // Otherwise, the implicitly declared copy constructor will have 2283 // the form 2284 // 2285 // X::X(X&) 2286 QualType ArgType = ClassType; 2287 if (HasConstCopyConstructor) 2288 ArgType = ArgType.withConst(); 2289 ArgType = Context.getLValueReferenceType(ArgType); 2290 2291 // An implicitly-declared copy constructor is an inline public 2292 // member of its class. 2293 DeclarationName Name 2294 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2295 CXXConstructorDecl *CopyConstructor 2296 = CXXConstructorDecl::Create(Context, ClassDecl, 2297 ClassDecl->getLocation(), Name, 2298 Context.getFunctionType(Context.VoidTy, 2299 &ArgType, 1, 2300 false, 0, 2301 /*FIXME:*/false, 2302 false, 0, 0, 2303 FunctionType::ExtInfo()), 2304 /*TInfo=*/0, 2305 /*isExplicit=*/false, 2306 /*isInline=*/true, 2307 /*isImplicitlyDeclared=*/true); 2308 CopyConstructor->setAccess(AS_public); 2309 CopyConstructor->setImplicit(); 2310 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2311 2312 // Add the parameter to the constructor. 2313 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2314 ClassDecl->getLocation(), 2315 /*IdentifierInfo=*/0, 2316 ArgType, /*TInfo=*/0, 2317 VarDecl::None, 0); 2318 CopyConstructor->setParams(&FromParam, 1); 2319 ClassDecl->addDecl(CopyConstructor); 2320 } 2321 2322 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2323 // Note: The following rules are largely analoguous to the copy 2324 // constructor rules. Note that virtual bases are not taken into account 2325 // for determining the argument type of the operator. Note also that 2326 // operators taking an object instead of a reference are allowed. 2327 // 2328 // C++ [class.copy]p10: 2329 // If the class definition does not explicitly declare a copy 2330 // assignment operator, one is declared implicitly. 2331 // The implicitly-defined copy assignment operator for a class X 2332 // will have the form 2333 // 2334 // X& X::operator=(const X&) 2335 // 2336 // if 2337 bool HasConstCopyAssignment = true; 2338 2339 // -- each direct base class B of X has a copy assignment operator 2340 // whose parameter is of type const B&, const volatile B& or B, 2341 // and 2342 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2343 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2344 assert(!Base->getType()->isDependentType() && 2345 "Cannot generate implicit members for class with dependent bases."); 2346 const CXXRecordDecl *BaseClassDecl 2347 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2348 const CXXMethodDecl *MD = 0; 2349 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2350 MD); 2351 } 2352 2353 // -- for all the nonstatic data members of X that are of a class 2354 // type M (or array thereof), each such class type has a copy 2355 // assignment operator whose parameter is of type const M&, 2356 // const volatile M& or M. 2357 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2358 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2359 ++Field) { 2360 QualType FieldType = (*Field)->getType(); 2361 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2362 FieldType = Array->getElementType(); 2363 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2364 const CXXRecordDecl *FieldClassDecl 2365 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2366 const CXXMethodDecl *MD = 0; 2367 HasConstCopyAssignment 2368 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2369 } 2370 } 2371 2372 // Otherwise, the implicitly declared copy assignment operator will 2373 // have the form 2374 // 2375 // X& X::operator=(X&) 2376 QualType ArgType = ClassType; 2377 QualType RetType = Context.getLValueReferenceType(ArgType); 2378 if (HasConstCopyAssignment) 2379 ArgType = ArgType.withConst(); 2380 ArgType = Context.getLValueReferenceType(ArgType); 2381 2382 // An implicitly-declared copy assignment operator is an inline public 2383 // member of its class. 2384 DeclarationName Name = 2385 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2386 CXXMethodDecl *CopyAssignment = 2387 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2388 Context.getFunctionType(RetType, &ArgType, 1, 2389 false, 0, 2390 /*FIXME:*/false, 2391 false, 0, 0, 2392 FunctionType::ExtInfo()), 2393 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2394 CopyAssignment->setAccess(AS_public); 2395 CopyAssignment->setImplicit(); 2396 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2397 CopyAssignment->setCopyAssignment(true); 2398 2399 // Add the parameter to the operator. 2400 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2401 ClassDecl->getLocation(), 2402 /*IdentifierInfo=*/0, 2403 ArgType, /*TInfo=*/0, 2404 VarDecl::None, 0); 2405 CopyAssignment->setParams(&FromParam, 1); 2406 2407 // Don't call addedAssignmentOperator. There is no way to distinguish an 2408 // implicit from an explicit assignment operator. 2409 ClassDecl->addDecl(CopyAssignment); 2410 AddOverriddenMethods(ClassDecl, CopyAssignment); 2411 } 2412 2413 if (!ClassDecl->hasUserDeclaredDestructor()) { 2414 // C++ [class.dtor]p2: 2415 // If a class has no user-declared destructor, a destructor is 2416 // declared implicitly. An implicitly-declared destructor is an 2417 // inline public member of its class. 2418 QualType Ty = Context.getFunctionType(Context.VoidTy, 2419 0, 0, false, 0, 2420 /*FIXME:*/false, 2421 false, 0, 0, FunctionType::ExtInfo()); 2422 2423 DeclarationName Name 2424 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2425 CXXDestructorDecl *Destructor 2426 = CXXDestructorDecl::Create(Context, ClassDecl, 2427 ClassDecl->getLocation(), Name, Ty, 2428 /*isInline=*/true, 2429 /*isImplicitlyDeclared=*/true); 2430 Destructor->setAccess(AS_public); 2431 Destructor->setImplicit(); 2432 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2433 ClassDecl->addDecl(Destructor); 2434 2435 // This could be uniqued if it ever proves significant. 2436 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2437 2438 AddOverriddenMethods(ClassDecl, Destructor); 2439 } 2440} 2441 2442void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2443 Decl *D = TemplateD.getAs<Decl>(); 2444 if (!D) 2445 return; 2446 2447 TemplateParameterList *Params = 0; 2448 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2449 Params = Template->getTemplateParameters(); 2450 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2451 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2452 Params = PartialSpec->getTemplateParameters(); 2453 else 2454 return; 2455 2456 for (TemplateParameterList::iterator Param = Params->begin(), 2457 ParamEnd = Params->end(); 2458 Param != ParamEnd; ++Param) { 2459 NamedDecl *Named = cast<NamedDecl>(*Param); 2460 if (Named->getDeclName()) { 2461 S->AddDecl(DeclPtrTy::make(Named)); 2462 IdResolver.AddDecl(Named); 2463 } 2464 } 2465} 2466 2467void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2468 if (!RecordD) return; 2469 AdjustDeclIfTemplate(RecordD); 2470 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2471 PushDeclContext(S, Record); 2472} 2473 2474void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2475 if (!RecordD) return; 2476 PopDeclContext(); 2477} 2478 2479/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2480/// parsing a top-level (non-nested) C++ class, and we are now 2481/// parsing those parts of the given Method declaration that could 2482/// not be parsed earlier (C++ [class.mem]p2), such as default 2483/// arguments. This action should enter the scope of the given 2484/// Method declaration as if we had just parsed the qualified method 2485/// name. However, it should not bring the parameters into scope; 2486/// that will be performed by ActOnDelayedCXXMethodParameter. 2487void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2488} 2489 2490/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2491/// C++ method declaration. We're (re-)introducing the given 2492/// function parameter into scope for use in parsing later parts of 2493/// the method declaration. For example, we could see an 2494/// ActOnParamDefaultArgument event for this parameter. 2495void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2496 if (!ParamD) 2497 return; 2498 2499 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2500 2501 // If this parameter has an unparsed default argument, clear it out 2502 // to make way for the parsed default argument. 2503 if (Param->hasUnparsedDefaultArg()) 2504 Param->setDefaultArg(0); 2505 2506 S->AddDecl(DeclPtrTy::make(Param)); 2507 if (Param->getDeclName()) 2508 IdResolver.AddDecl(Param); 2509} 2510 2511/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2512/// processing the delayed method declaration for Method. The method 2513/// declaration is now considered finished. There may be a separate 2514/// ActOnStartOfFunctionDef action later (not necessarily 2515/// immediately!) for this method, if it was also defined inside the 2516/// class body. 2517void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2518 if (!MethodD) 2519 return; 2520 2521 AdjustDeclIfTemplate(MethodD); 2522 2523 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2524 2525 // Now that we have our default arguments, check the constructor 2526 // again. It could produce additional diagnostics or affect whether 2527 // the class has implicitly-declared destructors, among other 2528 // things. 2529 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2530 CheckConstructor(Constructor); 2531 2532 // Check the default arguments, which we may have added. 2533 if (!Method->isInvalidDecl()) 2534 CheckCXXDefaultArguments(Method); 2535} 2536 2537/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2538/// the well-formedness of the constructor declarator @p D with type @p 2539/// R. If there are any errors in the declarator, this routine will 2540/// emit diagnostics and set the invalid bit to true. In any case, the type 2541/// will be updated to reflect a well-formed type for the constructor and 2542/// returned. 2543QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2544 FunctionDecl::StorageClass &SC) { 2545 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2546 2547 // C++ [class.ctor]p3: 2548 // A constructor shall not be virtual (10.3) or static (9.4). A 2549 // constructor can be invoked for a const, volatile or const 2550 // volatile object. A constructor shall not be declared const, 2551 // volatile, or const volatile (9.3.2). 2552 if (isVirtual) { 2553 if (!D.isInvalidType()) 2554 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2555 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2556 << SourceRange(D.getIdentifierLoc()); 2557 D.setInvalidType(); 2558 } 2559 if (SC == FunctionDecl::Static) { 2560 if (!D.isInvalidType()) 2561 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2562 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2563 << SourceRange(D.getIdentifierLoc()); 2564 D.setInvalidType(); 2565 SC = FunctionDecl::None; 2566 } 2567 2568 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2569 if (FTI.TypeQuals != 0) { 2570 if (FTI.TypeQuals & Qualifiers::Const) 2571 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2572 << "const" << SourceRange(D.getIdentifierLoc()); 2573 if (FTI.TypeQuals & Qualifiers::Volatile) 2574 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2575 << "volatile" << SourceRange(D.getIdentifierLoc()); 2576 if (FTI.TypeQuals & Qualifiers::Restrict) 2577 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2578 << "restrict" << SourceRange(D.getIdentifierLoc()); 2579 } 2580 2581 // Rebuild the function type "R" without any type qualifiers (in 2582 // case any of the errors above fired) and with "void" as the 2583 // return type, since constructors don't have return types. We 2584 // *always* have to do this, because GetTypeForDeclarator will 2585 // put in a result type of "int" when none was specified. 2586 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2587 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2588 Proto->getNumArgs(), 2589 Proto->isVariadic(), 0, 2590 Proto->hasExceptionSpec(), 2591 Proto->hasAnyExceptionSpec(), 2592 Proto->getNumExceptions(), 2593 Proto->exception_begin(), 2594 Proto->getExtInfo()); 2595} 2596 2597/// CheckConstructor - Checks a fully-formed constructor for 2598/// well-formedness, issuing any diagnostics required. Returns true if 2599/// the constructor declarator is invalid. 2600void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2601 CXXRecordDecl *ClassDecl 2602 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2603 if (!ClassDecl) 2604 return Constructor->setInvalidDecl(); 2605 2606 // C++ [class.copy]p3: 2607 // A declaration of a constructor for a class X is ill-formed if 2608 // its first parameter is of type (optionally cv-qualified) X and 2609 // either there are no other parameters or else all other 2610 // parameters have default arguments. 2611 if (!Constructor->isInvalidDecl() && 2612 ((Constructor->getNumParams() == 1) || 2613 (Constructor->getNumParams() > 1 && 2614 Constructor->getParamDecl(1)->hasDefaultArg())) && 2615 Constructor->getTemplateSpecializationKind() 2616 != TSK_ImplicitInstantiation) { 2617 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2618 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2619 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2620 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2621 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2622 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2623 2624 // FIXME: Rather that making the constructor invalid, we should endeavor 2625 // to fix the type. 2626 Constructor->setInvalidDecl(); 2627 } 2628 } 2629 2630 // Notify the class that we've added a constructor. 2631 ClassDecl->addedConstructor(Context, Constructor); 2632} 2633 2634/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2635/// issuing any diagnostics required. Returns true on error. 2636bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2637 CXXRecordDecl *RD = Destructor->getParent(); 2638 2639 if (Destructor->isVirtual()) { 2640 SourceLocation Loc; 2641 2642 if (!Destructor->isImplicit()) 2643 Loc = Destructor->getLocation(); 2644 else 2645 Loc = RD->getLocation(); 2646 2647 // If we have a virtual destructor, look up the deallocation function 2648 FunctionDecl *OperatorDelete = 0; 2649 DeclarationName Name = 2650 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2651 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2652 return true; 2653 2654 Destructor->setOperatorDelete(OperatorDelete); 2655 } 2656 2657 return false; 2658} 2659 2660static inline bool 2661FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2662 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2663 FTI.ArgInfo[0].Param && 2664 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2665} 2666 2667/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2668/// the well-formednes of the destructor declarator @p D with type @p 2669/// R. If there are any errors in the declarator, this routine will 2670/// emit diagnostics and set the declarator to invalid. Even if this happens, 2671/// will be updated to reflect a well-formed type for the destructor and 2672/// returned. 2673QualType Sema::CheckDestructorDeclarator(Declarator &D, 2674 FunctionDecl::StorageClass& SC) { 2675 // C++ [class.dtor]p1: 2676 // [...] A typedef-name that names a class is a class-name 2677 // (7.1.3); however, a typedef-name that names a class shall not 2678 // be used as the identifier in the declarator for a destructor 2679 // declaration. 2680 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2681 if (isa<TypedefType>(DeclaratorType)) { 2682 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2683 << DeclaratorType; 2684 D.setInvalidType(); 2685 } 2686 2687 // C++ [class.dtor]p2: 2688 // A destructor is used to destroy objects of its class type. A 2689 // destructor takes no parameters, and no return type can be 2690 // specified for it (not even void). The address of a destructor 2691 // shall not be taken. A destructor shall not be static. A 2692 // destructor can be invoked for a const, volatile or const 2693 // volatile object. A destructor shall not be declared const, 2694 // volatile or const volatile (9.3.2). 2695 if (SC == FunctionDecl::Static) { 2696 if (!D.isInvalidType()) 2697 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2698 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2699 << SourceRange(D.getIdentifierLoc()); 2700 SC = FunctionDecl::None; 2701 D.setInvalidType(); 2702 } 2703 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2704 // Destructors don't have return types, but the parser will 2705 // happily parse something like: 2706 // 2707 // class X { 2708 // float ~X(); 2709 // }; 2710 // 2711 // The return type will be eliminated later. 2712 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2713 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2714 << SourceRange(D.getIdentifierLoc()); 2715 } 2716 2717 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2718 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2719 if (FTI.TypeQuals & Qualifiers::Const) 2720 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2721 << "const" << SourceRange(D.getIdentifierLoc()); 2722 if (FTI.TypeQuals & Qualifiers::Volatile) 2723 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2724 << "volatile" << SourceRange(D.getIdentifierLoc()); 2725 if (FTI.TypeQuals & Qualifiers::Restrict) 2726 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2727 << "restrict" << SourceRange(D.getIdentifierLoc()); 2728 D.setInvalidType(); 2729 } 2730 2731 // Make sure we don't have any parameters. 2732 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2733 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2734 2735 // Delete the parameters. 2736 FTI.freeArgs(); 2737 D.setInvalidType(); 2738 } 2739 2740 // Make sure the destructor isn't variadic. 2741 if (FTI.isVariadic) { 2742 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2743 D.setInvalidType(); 2744 } 2745 2746 // Rebuild the function type "R" without any type qualifiers or 2747 // parameters (in case any of the errors above fired) and with 2748 // "void" as the return type, since destructors don't have return 2749 // types. We *always* have to do this, because GetTypeForDeclarator 2750 // will put in a result type of "int" when none was specified. 2751 // FIXME: Exceptions! 2752 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2753 false, false, 0, 0, FunctionType::ExtInfo()); 2754} 2755 2756/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2757/// well-formednes of the conversion function declarator @p D with 2758/// type @p R. If there are any errors in the declarator, this routine 2759/// will emit diagnostics and return true. Otherwise, it will return 2760/// false. Either way, the type @p R will be updated to reflect a 2761/// well-formed type for the conversion operator. 2762void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2763 FunctionDecl::StorageClass& SC) { 2764 // C++ [class.conv.fct]p1: 2765 // Neither parameter types nor return type can be specified. The 2766 // type of a conversion function (8.3.5) is "function taking no 2767 // parameter returning conversion-type-id." 2768 if (SC == FunctionDecl::Static) { 2769 if (!D.isInvalidType()) 2770 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2771 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2772 << SourceRange(D.getIdentifierLoc()); 2773 D.setInvalidType(); 2774 SC = FunctionDecl::None; 2775 } 2776 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2777 // Conversion functions don't have return types, but the parser will 2778 // happily parse something like: 2779 // 2780 // class X { 2781 // float operator bool(); 2782 // }; 2783 // 2784 // The return type will be changed later anyway. 2785 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2786 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2787 << SourceRange(D.getIdentifierLoc()); 2788 } 2789 2790 // Make sure we don't have any parameters. 2791 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2792 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2793 2794 // Delete the parameters. 2795 D.getTypeObject(0).Fun.freeArgs(); 2796 D.setInvalidType(); 2797 } 2798 2799 // Make sure the conversion function isn't variadic. 2800 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2801 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2802 D.setInvalidType(); 2803 } 2804 2805 // C++ [class.conv.fct]p4: 2806 // The conversion-type-id shall not represent a function type nor 2807 // an array type. 2808 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2809 if (ConvType->isArrayType()) { 2810 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2811 ConvType = Context.getPointerType(ConvType); 2812 D.setInvalidType(); 2813 } else if (ConvType->isFunctionType()) { 2814 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2815 ConvType = Context.getPointerType(ConvType); 2816 D.setInvalidType(); 2817 } 2818 2819 // Rebuild the function type "R" without any parameters (in case any 2820 // of the errors above fired) and with the conversion type as the 2821 // return type. 2822 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2823 R = Context.getFunctionType(ConvType, 0, 0, false, 2824 Proto->getTypeQuals(), 2825 Proto->hasExceptionSpec(), 2826 Proto->hasAnyExceptionSpec(), 2827 Proto->getNumExceptions(), 2828 Proto->exception_begin(), 2829 Proto->getExtInfo()); 2830 2831 // C++0x explicit conversion operators. 2832 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2833 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2834 diag::warn_explicit_conversion_functions) 2835 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2836} 2837 2838/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2839/// the declaration of the given C++ conversion function. This routine 2840/// is responsible for recording the conversion function in the C++ 2841/// class, if possible. 2842Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2843 assert(Conversion && "Expected to receive a conversion function declaration"); 2844 2845 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2846 2847 // Make sure we aren't redeclaring the conversion function. 2848 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2849 2850 // C++ [class.conv.fct]p1: 2851 // [...] A conversion function is never used to convert a 2852 // (possibly cv-qualified) object to the (possibly cv-qualified) 2853 // same object type (or a reference to it), to a (possibly 2854 // cv-qualified) base class of that type (or a reference to it), 2855 // or to (possibly cv-qualified) void. 2856 // FIXME: Suppress this warning if the conversion function ends up being a 2857 // virtual function that overrides a virtual function in a base class. 2858 QualType ClassType 2859 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2860 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2861 ConvType = ConvTypeRef->getPointeeType(); 2862 if (ConvType->isRecordType()) { 2863 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2864 if (ConvType == ClassType) 2865 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2866 << ClassType; 2867 else if (IsDerivedFrom(ClassType, ConvType)) 2868 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2869 << ClassType << ConvType; 2870 } else if (ConvType->isVoidType()) { 2871 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2872 << ClassType << ConvType; 2873 } 2874 2875 if (Conversion->getPrimaryTemplate()) { 2876 // ignore specializations 2877 } else if (Conversion->getPreviousDeclaration()) { 2878 if (FunctionTemplateDecl *ConversionTemplate 2879 = Conversion->getDescribedFunctionTemplate()) { 2880 if (ClassDecl->replaceConversion( 2881 ConversionTemplate->getPreviousDeclaration(), 2882 ConversionTemplate)) 2883 return DeclPtrTy::make(ConversionTemplate); 2884 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2885 Conversion)) 2886 return DeclPtrTy::make(Conversion); 2887 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2888 } else if (FunctionTemplateDecl *ConversionTemplate 2889 = Conversion->getDescribedFunctionTemplate()) 2890 ClassDecl->addConversionFunction(ConversionTemplate); 2891 else 2892 ClassDecl->addConversionFunction(Conversion); 2893 2894 return DeclPtrTy::make(Conversion); 2895} 2896 2897//===----------------------------------------------------------------------===// 2898// Namespace Handling 2899//===----------------------------------------------------------------------===// 2900 2901/// ActOnStartNamespaceDef - This is called at the start of a namespace 2902/// definition. 2903Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2904 SourceLocation IdentLoc, 2905 IdentifierInfo *II, 2906 SourceLocation LBrace, 2907 AttributeList *AttrList) { 2908 NamespaceDecl *Namespc = 2909 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2910 Namespc->setLBracLoc(LBrace); 2911 2912 Scope *DeclRegionScope = NamespcScope->getParent(); 2913 2914 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2915 2916 if (II) { 2917 // C++ [namespace.def]p2: 2918 // The identifier in an original-namespace-definition shall not have been 2919 // previously defined in the declarative region in which the 2920 // original-namespace-definition appears. The identifier in an 2921 // original-namespace-definition is the name of the namespace. Subsequently 2922 // in that declarative region, it is treated as an original-namespace-name. 2923 2924 NamedDecl *PrevDecl 2925 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2926 ForRedeclaration); 2927 2928 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2929 // This is an extended namespace definition. 2930 // Attach this namespace decl to the chain of extended namespace 2931 // definitions. 2932 OrigNS->setNextNamespace(Namespc); 2933 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2934 2935 // Remove the previous declaration from the scope. 2936 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2937 IdResolver.RemoveDecl(OrigNS); 2938 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2939 } 2940 } else if (PrevDecl) { 2941 // This is an invalid name redefinition. 2942 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2943 << Namespc->getDeclName(); 2944 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2945 Namespc->setInvalidDecl(); 2946 // Continue on to push Namespc as current DeclContext and return it. 2947 } else if (II->isStr("std") && 2948 CurContext->getLookupContext()->isTranslationUnit()) { 2949 // This is the first "real" definition of the namespace "std", so update 2950 // our cache of the "std" namespace to point at this definition. 2951 if (StdNamespace) { 2952 // We had already defined a dummy namespace "std". Link this new 2953 // namespace definition to the dummy namespace "std". 2954 StdNamespace->setNextNamespace(Namespc); 2955 StdNamespace->setLocation(IdentLoc); 2956 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2957 } 2958 2959 // Make our StdNamespace cache point at the first real definition of the 2960 // "std" namespace. 2961 StdNamespace = Namespc; 2962 } 2963 2964 PushOnScopeChains(Namespc, DeclRegionScope); 2965 } else { 2966 // Anonymous namespaces. 2967 assert(Namespc->isAnonymousNamespace()); 2968 2969 // Link the anonymous namespace into its parent. 2970 NamespaceDecl *PrevDecl; 2971 DeclContext *Parent = CurContext->getLookupContext(); 2972 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2973 PrevDecl = TU->getAnonymousNamespace(); 2974 TU->setAnonymousNamespace(Namespc); 2975 } else { 2976 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2977 PrevDecl = ND->getAnonymousNamespace(); 2978 ND->setAnonymousNamespace(Namespc); 2979 } 2980 2981 // Link the anonymous namespace with its previous declaration. 2982 if (PrevDecl) { 2983 assert(PrevDecl->isAnonymousNamespace()); 2984 assert(!PrevDecl->getNextNamespace()); 2985 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2986 PrevDecl->setNextNamespace(Namespc); 2987 } 2988 2989 CurContext->addDecl(Namespc); 2990 2991 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2992 // behaves as if it were replaced by 2993 // namespace unique { /* empty body */ } 2994 // using namespace unique; 2995 // namespace unique { namespace-body } 2996 // where all occurrences of 'unique' in a translation unit are 2997 // replaced by the same identifier and this identifier differs 2998 // from all other identifiers in the entire program. 2999 3000 // We just create the namespace with an empty name and then add an 3001 // implicit using declaration, just like the standard suggests. 3002 // 3003 // CodeGen enforces the "universally unique" aspect by giving all 3004 // declarations semantically contained within an anonymous 3005 // namespace internal linkage. 3006 3007 if (!PrevDecl) { 3008 UsingDirectiveDecl* UD 3009 = UsingDirectiveDecl::Create(Context, CurContext, 3010 /* 'using' */ LBrace, 3011 /* 'namespace' */ SourceLocation(), 3012 /* qualifier */ SourceRange(), 3013 /* NNS */ NULL, 3014 /* identifier */ SourceLocation(), 3015 Namespc, 3016 /* Ancestor */ CurContext); 3017 UD->setImplicit(); 3018 CurContext->addDecl(UD); 3019 } 3020 } 3021 3022 // Although we could have an invalid decl (i.e. the namespace name is a 3023 // redefinition), push it as current DeclContext and try to continue parsing. 3024 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3025 // for the namespace has the declarations that showed up in that particular 3026 // namespace definition. 3027 PushDeclContext(NamespcScope, Namespc); 3028 return DeclPtrTy::make(Namespc); 3029} 3030 3031/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3032/// is a namespace alias, returns the namespace it points to. 3033static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3034 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3035 return AD->getNamespace(); 3036 return dyn_cast_or_null<NamespaceDecl>(D); 3037} 3038 3039/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3040/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3041void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3042 Decl *Dcl = D.getAs<Decl>(); 3043 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3044 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3045 Namespc->setRBracLoc(RBrace); 3046 PopDeclContext(); 3047} 3048 3049Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3050 SourceLocation UsingLoc, 3051 SourceLocation NamespcLoc, 3052 const CXXScopeSpec &SS, 3053 SourceLocation IdentLoc, 3054 IdentifierInfo *NamespcName, 3055 AttributeList *AttrList) { 3056 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3057 assert(NamespcName && "Invalid NamespcName."); 3058 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3059 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3060 3061 UsingDirectiveDecl *UDir = 0; 3062 3063 // Lookup namespace name. 3064 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3065 LookupParsedName(R, S, &SS); 3066 if (R.isAmbiguous()) 3067 return DeclPtrTy(); 3068 3069 if (!R.empty()) { 3070 NamedDecl *Named = R.getFoundDecl(); 3071 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3072 && "expected namespace decl"); 3073 // C++ [namespace.udir]p1: 3074 // A using-directive specifies that the names in the nominated 3075 // namespace can be used in the scope in which the 3076 // using-directive appears after the using-directive. During 3077 // unqualified name lookup (3.4.1), the names appear as if they 3078 // were declared in the nearest enclosing namespace which 3079 // contains both the using-directive and the nominated 3080 // namespace. [Note: in this context, "contains" means "contains 3081 // directly or indirectly". ] 3082 3083 // Find enclosing context containing both using-directive and 3084 // nominated namespace. 3085 NamespaceDecl *NS = getNamespaceDecl(Named); 3086 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3087 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3088 CommonAncestor = CommonAncestor->getParent(); 3089 3090 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3091 SS.getRange(), 3092 (NestedNameSpecifier *)SS.getScopeRep(), 3093 IdentLoc, Named, CommonAncestor); 3094 PushUsingDirective(S, UDir); 3095 } else { 3096 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3097 } 3098 3099 // FIXME: We ignore attributes for now. 3100 delete AttrList; 3101 return DeclPtrTy::make(UDir); 3102} 3103 3104void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3105 // If scope has associated entity, then using directive is at namespace 3106 // or translation unit scope. We add UsingDirectiveDecls, into 3107 // it's lookup structure. 3108 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3109 Ctx->addDecl(UDir); 3110 else 3111 // Otherwise it is block-sope. using-directives will affect lookup 3112 // only to the end of scope. 3113 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3114} 3115 3116 3117Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3118 AccessSpecifier AS, 3119 bool HasUsingKeyword, 3120 SourceLocation UsingLoc, 3121 const CXXScopeSpec &SS, 3122 UnqualifiedId &Name, 3123 AttributeList *AttrList, 3124 bool IsTypeName, 3125 SourceLocation TypenameLoc) { 3126 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3127 3128 switch (Name.getKind()) { 3129 case UnqualifiedId::IK_Identifier: 3130 case UnqualifiedId::IK_OperatorFunctionId: 3131 case UnqualifiedId::IK_LiteralOperatorId: 3132 case UnqualifiedId::IK_ConversionFunctionId: 3133 break; 3134 3135 case UnqualifiedId::IK_ConstructorName: 3136 case UnqualifiedId::IK_ConstructorTemplateId: 3137 // C++0x inherited constructors. 3138 if (getLangOptions().CPlusPlus0x) break; 3139 3140 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3141 << SS.getRange(); 3142 return DeclPtrTy(); 3143 3144 case UnqualifiedId::IK_DestructorName: 3145 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3146 << SS.getRange(); 3147 return DeclPtrTy(); 3148 3149 case UnqualifiedId::IK_TemplateId: 3150 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3151 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3152 return DeclPtrTy(); 3153 } 3154 3155 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3156 if (!TargetName) 3157 return DeclPtrTy(); 3158 3159 // Warn about using declarations. 3160 // TODO: store that the declaration was written without 'using' and 3161 // talk about access decls instead of using decls in the 3162 // diagnostics. 3163 if (!HasUsingKeyword) { 3164 UsingLoc = Name.getSourceRange().getBegin(); 3165 3166 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3167 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3168 } 3169 3170 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3171 Name.getSourceRange().getBegin(), 3172 TargetName, AttrList, 3173 /* IsInstantiation */ false, 3174 IsTypeName, TypenameLoc); 3175 if (UD) 3176 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3177 3178 return DeclPtrTy::make(UD); 3179} 3180 3181/// Determines whether to create a using shadow decl for a particular 3182/// decl, given the set of decls existing prior to this using lookup. 3183bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3184 const LookupResult &Previous) { 3185 // Diagnose finding a decl which is not from a base class of the 3186 // current class. We do this now because there are cases where this 3187 // function will silently decide not to build a shadow decl, which 3188 // will pre-empt further diagnostics. 3189 // 3190 // We don't need to do this in C++0x because we do the check once on 3191 // the qualifier. 3192 // 3193 // FIXME: diagnose the following if we care enough: 3194 // struct A { int foo; }; 3195 // struct B : A { using A::foo; }; 3196 // template <class T> struct C : A {}; 3197 // template <class T> struct D : C<T> { using B::foo; } // <--- 3198 // This is invalid (during instantiation) in C++03 because B::foo 3199 // resolves to the using decl in B, which is not a base class of D<T>. 3200 // We can't diagnose it immediately because C<T> is an unknown 3201 // specialization. The UsingShadowDecl in D<T> then points directly 3202 // to A::foo, which will look well-formed when we instantiate. 3203 // The right solution is to not collapse the shadow-decl chain. 3204 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3205 DeclContext *OrigDC = Orig->getDeclContext(); 3206 3207 // Handle enums and anonymous structs. 3208 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3209 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3210 while (OrigRec->isAnonymousStructOrUnion()) 3211 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3212 3213 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3214 if (OrigDC == CurContext) { 3215 Diag(Using->getLocation(), 3216 diag::err_using_decl_nested_name_specifier_is_current_class) 3217 << Using->getNestedNameRange(); 3218 Diag(Orig->getLocation(), diag::note_using_decl_target); 3219 return true; 3220 } 3221 3222 Diag(Using->getNestedNameRange().getBegin(), 3223 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3224 << Using->getTargetNestedNameDecl() 3225 << cast<CXXRecordDecl>(CurContext) 3226 << Using->getNestedNameRange(); 3227 Diag(Orig->getLocation(), diag::note_using_decl_target); 3228 return true; 3229 } 3230 } 3231 3232 if (Previous.empty()) return false; 3233 3234 NamedDecl *Target = Orig; 3235 if (isa<UsingShadowDecl>(Target)) 3236 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3237 3238 // If the target happens to be one of the previous declarations, we 3239 // don't have a conflict. 3240 // 3241 // FIXME: but we might be increasing its access, in which case we 3242 // should redeclare it. 3243 NamedDecl *NonTag = 0, *Tag = 0; 3244 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3245 I != E; ++I) { 3246 NamedDecl *D = (*I)->getUnderlyingDecl(); 3247 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3248 return false; 3249 3250 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3251 } 3252 3253 if (Target->isFunctionOrFunctionTemplate()) { 3254 FunctionDecl *FD; 3255 if (isa<FunctionTemplateDecl>(Target)) 3256 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3257 else 3258 FD = cast<FunctionDecl>(Target); 3259 3260 NamedDecl *OldDecl = 0; 3261 switch (CheckOverload(FD, Previous, OldDecl)) { 3262 case Ovl_Overload: 3263 return false; 3264 3265 case Ovl_NonFunction: 3266 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3267 break; 3268 3269 // We found a decl with the exact signature. 3270 case Ovl_Match: 3271 if (isa<UsingShadowDecl>(OldDecl)) { 3272 // Silently ignore the possible conflict. 3273 return false; 3274 } 3275 3276 // If we're in a record, we want to hide the target, so we 3277 // return true (without a diagnostic) to tell the caller not to 3278 // build a shadow decl. 3279 if (CurContext->isRecord()) 3280 return true; 3281 3282 // If we're not in a record, this is an error. 3283 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3284 break; 3285 } 3286 3287 Diag(Target->getLocation(), diag::note_using_decl_target); 3288 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3289 return true; 3290 } 3291 3292 // Target is not a function. 3293 3294 if (isa<TagDecl>(Target)) { 3295 // No conflict between a tag and a non-tag. 3296 if (!Tag) return false; 3297 3298 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3299 Diag(Target->getLocation(), diag::note_using_decl_target); 3300 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3301 return true; 3302 } 3303 3304 // No conflict between a tag and a non-tag. 3305 if (!NonTag) return false; 3306 3307 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3308 Diag(Target->getLocation(), diag::note_using_decl_target); 3309 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3310 return true; 3311} 3312 3313/// Builds a shadow declaration corresponding to a 'using' declaration. 3314UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3315 UsingDecl *UD, 3316 NamedDecl *Orig) { 3317 3318 // If we resolved to another shadow declaration, just coalesce them. 3319 NamedDecl *Target = Orig; 3320 if (isa<UsingShadowDecl>(Target)) { 3321 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3322 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3323 } 3324 3325 UsingShadowDecl *Shadow 3326 = UsingShadowDecl::Create(Context, CurContext, 3327 UD->getLocation(), UD, Target); 3328 UD->addShadowDecl(Shadow); 3329 3330 if (S) 3331 PushOnScopeChains(Shadow, S); 3332 else 3333 CurContext->addDecl(Shadow); 3334 Shadow->setAccess(UD->getAccess()); 3335 3336 // Register it as a conversion if appropriate. 3337 if (Shadow->getDeclName().getNameKind() 3338 == DeclarationName::CXXConversionFunctionName) 3339 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3340 3341 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3342 Shadow->setInvalidDecl(); 3343 3344 return Shadow; 3345} 3346 3347/// Hides a using shadow declaration. This is required by the current 3348/// using-decl implementation when a resolvable using declaration in a 3349/// class is followed by a declaration which would hide or override 3350/// one or more of the using decl's targets; for example: 3351/// 3352/// struct Base { void foo(int); }; 3353/// struct Derived : Base { 3354/// using Base::foo; 3355/// void foo(int); 3356/// }; 3357/// 3358/// The governing language is C++03 [namespace.udecl]p12: 3359/// 3360/// When a using-declaration brings names from a base class into a 3361/// derived class scope, member functions in the derived class 3362/// override and/or hide member functions with the same name and 3363/// parameter types in a base class (rather than conflicting). 3364/// 3365/// There are two ways to implement this: 3366/// (1) optimistically create shadow decls when they're not hidden 3367/// by existing declarations, or 3368/// (2) don't create any shadow decls (or at least don't make them 3369/// visible) until we've fully parsed/instantiated the class. 3370/// The problem with (1) is that we might have to retroactively remove 3371/// a shadow decl, which requires several O(n) operations because the 3372/// decl structures are (very reasonably) not designed for removal. 3373/// (2) avoids this but is very fiddly and phase-dependent. 3374void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3375 if (Shadow->getDeclName().getNameKind() == 3376 DeclarationName::CXXConversionFunctionName) 3377 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3378 3379 // Remove it from the DeclContext... 3380 Shadow->getDeclContext()->removeDecl(Shadow); 3381 3382 // ...and the scope, if applicable... 3383 if (S) { 3384 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3385 IdResolver.RemoveDecl(Shadow); 3386 } 3387 3388 // ...and the using decl. 3389 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3390 3391 // TODO: complain somehow if Shadow was used. It shouldn't 3392 // be possible for this to happen, because...? 3393} 3394 3395/// Builds a using declaration. 3396/// 3397/// \param IsInstantiation - Whether this call arises from an 3398/// instantiation of an unresolved using declaration. We treat 3399/// the lookup differently for these declarations. 3400NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3401 SourceLocation UsingLoc, 3402 const CXXScopeSpec &SS, 3403 SourceLocation IdentLoc, 3404 DeclarationName Name, 3405 AttributeList *AttrList, 3406 bool IsInstantiation, 3407 bool IsTypeName, 3408 SourceLocation TypenameLoc) { 3409 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3410 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3411 3412 // FIXME: We ignore attributes for now. 3413 delete AttrList; 3414 3415 if (SS.isEmpty()) { 3416 Diag(IdentLoc, diag::err_using_requires_qualname); 3417 return 0; 3418 } 3419 3420 // Do the redeclaration lookup in the current scope. 3421 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3422 ForRedeclaration); 3423 Previous.setHideTags(false); 3424 if (S) { 3425 LookupName(Previous, S); 3426 3427 // It is really dumb that we have to do this. 3428 LookupResult::Filter F = Previous.makeFilter(); 3429 while (F.hasNext()) { 3430 NamedDecl *D = F.next(); 3431 if (!isDeclInScope(D, CurContext, S)) 3432 F.erase(); 3433 } 3434 F.done(); 3435 } else { 3436 assert(IsInstantiation && "no scope in non-instantiation"); 3437 assert(CurContext->isRecord() && "scope not record in instantiation"); 3438 LookupQualifiedName(Previous, CurContext); 3439 } 3440 3441 NestedNameSpecifier *NNS = 3442 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3443 3444 // Check for invalid redeclarations. 3445 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3446 return 0; 3447 3448 // Check for bad qualifiers. 3449 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3450 return 0; 3451 3452 DeclContext *LookupContext = computeDeclContext(SS); 3453 NamedDecl *D; 3454 if (!LookupContext) { 3455 if (IsTypeName) { 3456 // FIXME: not all declaration name kinds are legal here 3457 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3458 UsingLoc, TypenameLoc, 3459 SS.getRange(), NNS, 3460 IdentLoc, Name); 3461 } else { 3462 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3463 UsingLoc, SS.getRange(), NNS, 3464 IdentLoc, Name); 3465 } 3466 } else { 3467 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3468 SS.getRange(), UsingLoc, NNS, Name, 3469 IsTypeName); 3470 } 3471 D->setAccess(AS); 3472 CurContext->addDecl(D); 3473 3474 if (!LookupContext) return D; 3475 UsingDecl *UD = cast<UsingDecl>(D); 3476 3477 if (RequireCompleteDeclContext(SS)) { 3478 UD->setInvalidDecl(); 3479 return UD; 3480 } 3481 3482 // Look up the target name. 3483 3484 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3485 3486 // Unlike most lookups, we don't always want to hide tag 3487 // declarations: tag names are visible through the using declaration 3488 // even if hidden by ordinary names, *except* in a dependent context 3489 // where it's important for the sanity of two-phase lookup. 3490 if (!IsInstantiation) 3491 R.setHideTags(false); 3492 3493 LookupQualifiedName(R, LookupContext); 3494 3495 if (R.empty()) { 3496 Diag(IdentLoc, diag::err_no_member) 3497 << Name << LookupContext << SS.getRange(); 3498 UD->setInvalidDecl(); 3499 return UD; 3500 } 3501 3502 if (R.isAmbiguous()) { 3503 UD->setInvalidDecl(); 3504 return UD; 3505 } 3506 3507 if (IsTypeName) { 3508 // If we asked for a typename and got a non-type decl, error out. 3509 if (!R.getAsSingle<TypeDecl>()) { 3510 Diag(IdentLoc, diag::err_using_typename_non_type); 3511 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3512 Diag((*I)->getUnderlyingDecl()->getLocation(), 3513 diag::note_using_decl_target); 3514 UD->setInvalidDecl(); 3515 return UD; 3516 } 3517 } else { 3518 // If we asked for a non-typename and we got a type, error out, 3519 // but only if this is an instantiation of an unresolved using 3520 // decl. Otherwise just silently find the type name. 3521 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3522 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3523 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3524 UD->setInvalidDecl(); 3525 return UD; 3526 } 3527 } 3528 3529 // C++0x N2914 [namespace.udecl]p6: 3530 // A using-declaration shall not name a namespace. 3531 if (R.getAsSingle<NamespaceDecl>()) { 3532 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3533 << SS.getRange(); 3534 UD->setInvalidDecl(); 3535 return UD; 3536 } 3537 3538 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3539 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3540 BuildUsingShadowDecl(S, UD, *I); 3541 } 3542 3543 return UD; 3544} 3545 3546/// Checks that the given using declaration is not an invalid 3547/// redeclaration. Note that this is checking only for the using decl 3548/// itself, not for any ill-formedness among the UsingShadowDecls. 3549bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3550 bool isTypeName, 3551 const CXXScopeSpec &SS, 3552 SourceLocation NameLoc, 3553 const LookupResult &Prev) { 3554 // C++03 [namespace.udecl]p8: 3555 // C++0x [namespace.udecl]p10: 3556 // A using-declaration is a declaration and can therefore be used 3557 // repeatedly where (and only where) multiple declarations are 3558 // allowed. 3559 // That's only in file contexts. 3560 if (CurContext->getLookupContext()->isFileContext()) 3561 return false; 3562 3563 NestedNameSpecifier *Qual 3564 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3565 3566 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3567 NamedDecl *D = *I; 3568 3569 bool DTypename; 3570 NestedNameSpecifier *DQual; 3571 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3572 DTypename = UD->isTypeName(); 3573 DQual = UD->getTargetNestedNameDecl(); 3574 } else if (UnresolvedUsingValueDecl *UD 3575 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3576 DTypename = false; 3577 DQual = UD->getTargetNestedNameSpecifier(); 3578 } else if (UnresolvedUsingTypenameDecl *UD 3579 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3580 DTypename = true; 3581 DQual = UD->getTargetNestedNameSpecifier(); 3582 } else continue; 3583 3584 // using decls differ if one says 'typename' and the other doesn't. 3585 // FIXME: non-dependent using decls? 3586 if (isTypeName != DTypename) continue; 3587 3588 // using decls differ if they name different scopes (but note that 3589 // template instantiation can cause this check to trigger when it 3590 // didn't before instantiation). 3591 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3592 Context.getCanonicalNestedNameSpecifier(DQual)) 3593 continue; 3594 3595 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3596 Diag(D->getLocation(), diag::note_using_decl) << 1; 3597 return true; 3598 } 3599 3600 return false; 3601} 3602 3603 3604/// Checks that the given nested-name qualifier used in a using decl 3605/// in the current context is appropriately related to the current 3606/// scope. If an error is found, diagnoses it and returns true. 3607bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3608 const CXXScopeSpec &SS, 3609 SourceLocation NameLoc) { 3610 DeclContext *NamedContext = computeDeclContext(SS); 3611 3612 if (!CurContext->isRecord()) { 3613 // C++03 [namespace.udecl]p3: 3614 // C++0x [namespace.udecl]p8: 3615 // A using-declaration for a class member shall be a member-declaration. 3616 3617 // If we weren't able to compute a valid scope, it must be a 3618 // dependent class scope. 3619 if (!NamedContext || NamedContext->isRecord()) { 3620 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3621 << SS.getRange(); 3622 return true; 3623 } 3624 3625 // Otherwise, everything is known to be fine. 3626 return false; 3627 } 3628 3629 // The current scope is a record. 3630 3631 // If the named context is dependent, we can't decide much. 3632 if (!NamedContext) { 3633 // FIXME: in C++0x, we can diagnose if we can prove that the 3634 // nested-name-specifier does not refer to a base class, which is 3635 // still possible in some cases. 3636 3637 // Otherwise we have to conservatively report that things might be 3638 // okay. 3639 return false; 3640 } 3641 3642 if (!NamedContext->isRecord()) { 3643 // Ideally this would point at the last name in the specifier, 3644 // but we don't have that level of source info. 3645 Diag(SS.getRange().getBegin(), 3646 diag::err_using_decl_nested_name_specifier_is_not_class) 3647 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3648 return true; 3649 } 3650 3651 if (getLangOptions().CPlusPlus0x) { 3652 // C++0x [namespace.udecl]p3: 3653 // In a using-declaration used as a member-declaration, the 3654 // nested-name-specifier shall name a base class of the class 3655 // being defined. 3656 3657 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3658 cast<CXXRecordDecl>(NamedContext))) { 3659 if (CurContext == NamedContext) { 3660 Diag(NameLoc, 3661 diag::err_using_decl_nested_name_specifier_is_current_class) 3662 << SS.getRange(); 3663 return true; 3664 } 3665 3666 Diag(SS.getRange().getBegin(), 3667 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3668 << (NestedNameSpecifier*) SS.getScopeRep() 3669 << cast<CXXRecordDecl>(CurContext) 3670 << SS.getRange(); 3671 return true; 3672 } 3673 3674 return false; 3675 } 3676 3677 // C++03 [namespace.udecl]p4: 3678 // A using-declaration used as a member-declaration shall refer 3679 // to a member of a base class of the class being defined [etc.]. 3680 3681 // Salient point: SS doesn't have to name a base class as long as 3682 // lookup only finds members from base classes. Therefore we can 3683 // diagnose here only if we can prove that that can't happen, 3684 // i.e. if the class hierarchies provably don't intersect. 3685 3686 // TODO: it would be nice if "definitely valid" results were cached 3687 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3688 // need to be repeated. 3689 3690 struct UserData { 3691 llvm::DenseSet<const CXXRecordDecl*> Bases; 3692 3693 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3694 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3695 Data->Bases.insert(Base); 3696 return true; 3697 } 3698 3699 bool hasDependentBases(const CXXRecordDecl *Class) { 3700 return !Class->forallBases(collect, this); 3701 } 3702 3703 /// Returns true if the base is dependent or is one of the 3704 /// accumulated base classes. 3705 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3706 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3707 return !Data->Bases.count(Base); 3708 } 3709 3710 bool mightShareBases(const CXXRecordDecl *Class) { 3711 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3712 } 3713 }; 3714 3715 UserData Data; 3716 3717 // Returns false if we find a dependent base. 3718 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3719 return false; 3720 3721 // Returns false if the class has a dependent base or if it or one 3722 // of its bases is present in the base set of the current context. 3723 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3724 return false; 3725 3726 Diag(SS.getRange().getBegin(), 3727 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3728 << (NestedNameSpecifier*) SS.getScopeRep() 3729 << cast<CXXRecordDecl>(CurContext) 3730 << SS.getRange(); 3731 3732 return true; 3733} 3734 3735Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3736 SourceLocation NamespaceLoc, 3737 SourceLocation AliasLoc, 3738 IdentifierInfo *Alias, 3739 const CXXScopeSpec &SS, 3740 SourceLocation IdentLoc, 3741 IdentifierInfo *Ident) { 3742 3743 // Lookup the namespace name. 3744 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3745 LookupParsedName(R, S, &SS); 3746 3747 // Check if we have a previous declaration with the same name. 3748 if (NamedDecl *PrevDecl 3749 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3750 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3751 // We already have an alias with the same name that points to the same 3752 // namespace, so don't create a new one. 3753 // FIXME: At some point, we'll want to create the (redundant) 3754 // declaration to maintain better source information. 3755 if (!R.isAmbiguous() && !R.empty() && 3756 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3757 return DeclPtrTy(); 3758 } 3759 3760 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3761 diag::err_redefinition_different_kind; 3762 Diag(AliasLoc, DiagID) << Alias; 3763 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3764 return DeclPtrTy(); 3765 } 3766 3767 if (R.isAmbiguous()) 3768 return DeclPtrTy(); 3769 3770 if (R.empty()) { 3771 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3772 return DeclPtrTy(); 3773 } 3774 3775 NamespaceAliasDecl *AliasDecl = 3776 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3777 Alias, SS.getRange(), 3778 (NestedNameSpecifier *)SS.getScopeRep(), 3779 IdentLoc, R.getFoundDecl()); 3780 3781 PushOnScopeChains(AliasDecl, S); 3782 return DeclPtrTy::make(AliasDecl); 3783} 3784 3785void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3786 CXXConstructorDecl *Constructor) { 3787 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3788 !Constructor->isUsed()) && 3789 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3790 3791 CXXRecordDecl *ClassDecl 3792 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3793 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3794 3795 DeclContext *PreviousContext = CurContext; 3796 CurContext = Constructor; 3797 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3798 Diag(CurrentLocation, diag::note_member_synthesized_at) 3799 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3800 Constructor->setInvalidDecl(); 3801 } else { 3802 Constructor->setUsed(); 3803 } 3804 CurContext = PreviousContext; 3805} 3806 3807void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3808 CXXDestructorDecl *Destructor) { 3809 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3810 "DefineImplicitDestructor - call it for implicit default dtor"); 3811 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3812 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3813 3814 DeclContext *PreviousContext = CurContext; 3815 CurContext = Destructor; 3816 3817 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3818 Destructor->getParent()); 3819 3820 // FIXME: If CheckDestructor fails, we should emit a note about where the 3821 // implicit destructor was needed. 3822 if (CheckDestructor(Destructor)) { 3823 Diag(CurrentLocation, diag::note_member_synthesized_at) 3824 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3825 3826 Destructor->setInvalidDecl(); 3827 CurContext = PreviousContext; 3828 3829 return; 3830 } 3831 CurContext = PreviousContext; 3832 3833 Destructor->setUsed(); 3834} 3835 3836void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3837 CXXMethodDecl *MethodDecl) { 3838 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3839 MethodDecl->getOverloadedOperator() == OO_Equal && 3840 !MethodDecl->isUsed()) && 3841 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3842 3843 CXXRecordDecl *ClassDecl 3844 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3845 3846 DeclContext *PreviousContext = CurContext; 3847 CurContext = MethodDecl; 3848 3849 // C++[class.copy] p12 3850 // Before the implicitly-declared copy assignment operator for a class is 3851 // implicitly defined, all implicitly-declared copy assignment operators 3852 // for its direct base classes and its nonstatic data members shall have 3853 // been implicitly defined. 3854 bool err = false; 3855 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3856 E = ClassDecl->bases_end(); Base != E; ++Base) { 3857 CXXRecordDecl *BaseClassDecl 3858 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3859 if (CXXMethodDecl *BaseAssignOpMethod = 3860 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3861 BaseClassDecl)) { 3862 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3863 BaseAssignOpMethod, 3864 PDiag(diag::err_access_assign_base) 3865 << Base->getType()); 3866 3867 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3868 } 3869 } 3870 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3871 E = ClassDecl->field_end(); Field != E; ++Field) { 3872 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3873 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3874 FieldType = Array->getElementType(); 3875 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3876 CXXRecordDecl *FieldClassDecl 3877 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3878 if (CXXMethodDecl *FieldAssignOpMethod = 3879 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3880 FieldClassDecl)) { 3881 CheckDirectMemberAccess(Field->getLocation(), 3882 FieldAssignOpMethod, 3883 PDiag(diag::err_access_assign_field) 3884 << Field->getDeclName() << Field->getType()); 3885 3886 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3887 } 3888 } else if (FieldType->isReferenceType()) { 3889 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3890 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3891 Diag(Field->getLocation(), diag::note_declared_at); 3892 Diag(CurrentLocation, diag::note_first_required_here); 3893 err = true; 3894 } else if (FieldType.isConstQualified()) { 3895 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3896 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3897 Diag(Field->getLocation(), diag::note_declared_at); 3898 Diag(CurrentLocation, diag::note_first_required_here); 3899 err = true; 3900 } 3901 } 3902 if (!err) 3903 MethodDecl->setUsed(); 3904 3905 CurContext = PreviousContext; 3906} 3907 3908CXXMethodDecl * 3909Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3910 ParmVarDecl *ParmDecl, 3911 CXXRecordDecl *ClassDecl) { 3912 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3913 QualType RHSType(LHSType); 3914 // If class's assignment operator argument is const/volatile qualified, 3915 // look for operator = (const/volatile B&). Otherwise, look for 3916 // operator = (B&). 3917 RHSType = Context.getCVRQualifiedType(RHSType, 3918 ParmDecl->getType().getCVRQualifiers()); 3919 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3920 LHSType, 3921 SourceLocation())); 3922 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3923 RHSType, 3924 CurrentLocation)); 3925 Expr *Args[2] = { &*LHS, &*RHS }; 3926 OverloadCandidateSet CandidateSet(CurrentLocation); 3927 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3928 CandidateSet); 3929 OverloadCandidateSet::iterator Best; 3930 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3931 return cast<CXXMethodDecl>(Best->Function); 3932 assert(false && 3933 "getAssignOperatorMethod - copy assignment operator method not found"); 3934 return 0; 3935} 3936 3937void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3938 CXXConstructorDecl *CopyConstructor, 3939 unsigned TypeQuals) { 3940 assert((CopyConstructor->isImplicit() && 3941 CopyConstructor->isCopyConstructor(TypeQuals) && 3942 !CopyConstructor->isUsed()) && 3943 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3944 3945 CXXRecordDecl *ClassDecl 3946 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3947 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3948 3949 DeclContext *PreviousContext = CurContext; 3950 CurContext = CopyConstructor; 3951 3952 // C++ [class.copy] p209 3953 // Before the implicitly-declared copy constructor for a class is 3954 // implicitly defined, all the implicitly-declared copy constructors 3955 // for its base class and its non-static data members shall have been 3956 // implicitly defined. 3957 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3958 Base != ClassDecl->bases_end(); ++Base) { 3959 CXXRecordDecl *BaseClassDecl 3960 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3961 if (CXXConstructorDecl *BaseCopyCtor = 3962 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3963 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3964 BaseCopyCtor, 3965 PDiag(diag::err_access_copy_base) 3966 << Base->getType()); 3967 3968 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3969 } 3970 } 3971 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3972 FieldEnd = ClassDecl->field_end(); 3973 Field != FieldEnd; ++Field) { 3974 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3975 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3976 FieldType = Array->getElementType(); 3977 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3978 CXXRecordDecl *FieldClassDecl 3979 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3980 if (CXXConstructorDecl *FieldCopyCtor = 3981 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 3982 CheckDirectMemberAccess(Field->getLocation(), 3983 FieldCopyCtor, 3984 PDiag(diag::err_access_copy_field) 3985 << Field->getDeclName() << Field->getType()); 3986 3987 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3988 } 3989 } 3990 } 3991 CopyConstructor->setUsed(); 3992 3993 CurContext = PreviousContext; 3994} 3995 3996Sema::OwningExprResult 3997Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3998 CXXConstructorDecl *Constructor, 3999 MultiExprArg ExprArgs, 4000 bool RequiresZeroInit, 4001 bool BaseInitialization) { 4002 bool Elidable = false; 4003 4004 // C++ [class.copy]p15: 4005 // Whenever a temporary class object is copied using a copy constructor, and 4006 // this object and the copy have the same cv-unqualified type, an 4007 // implementation is permitted to treat the original and the copy as two 4008 // different ways of referring to the same object and not perform a copy at 4009 // all, even if the class copy constructor or destructor have side effects. 4010 4011 // FIXME: Is this enough? 4012 if (Constructor->isCopyConstructor()) { 4013 Expr *E = ((Expr **)ExprArgs.get())[0]; 4014 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4015 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4016 E = ICE->getSubExpr(); 4017 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 4018 E = FCE->getSubExpr(); 4019 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 4020 E = BE->getSubExpr(); 4021 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4022 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4023 E = ICE->getSubExpr(); 4024 4025 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 4026 Elidable = !CE->getCallReturnType()->isReferenceType(); 4027 else if (isa<CXXTemporaryObjectExpr>(E)) 4028 Elidable = true; 4029 else if (isa<CXXConstructExpr>(E)) 4030 Elidable = true; 4031 } 4032 4033 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4034 Elidable, move(ExprArgs), RequiresZeroInit, 4035 BaseInitialization); 4036} 4037 4038/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4039/// including handling of its default argument expressions. 4040Sema::OwningExprResult 4041Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4042 CXXConstructorDecl *Constructor, bool Elidable, 4043 MultiExprArg ExprArgs, 4044 bool RequiresZeroInit, 4045 bool BaseInitialization) { 4046 unsigned NumExprs = ExprArgs.size(); 4047 Expr **Exprs = (Expr **)ExprArgs.release(); 4048 4049 MarkDeclarationReferenced(ConstructLoc, Constructor); 4050 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4051 Constructor, Elidable, Exprs, NumExprs, 4052 RequiresZeroInit, BaseInitialization)); 4053} 4054 4055bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4056 CXXConstructorDecl *Constructor, 4057 MultiExprArg Exprs) { 4058 OwningExprResult TempResult = 4059 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4060 move(Exprs)); 4061 if (TempResult.isInvalid()) 4062 return true; 4063 4064 Expr *Temp = TempResult.takeAs<Expr>(); 4065 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4066 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4067 VD->setInit(Temp); 4068 4069 return false; 4070} 4071 4072void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4073 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4074 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4075 !ClassDecl->hasTrivialDestructor()) { 4076 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4077 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4078 CheckDestructorAccess(VD->getLocation(), Destructor, 4079 PDiag(diag::err_access_dtor_var) 4080 << VD->getDeclName() 4081 << VD->getType()); 4082 } 4083} 4084 4085/// AddCXXDirectInitializerToDecl - This action is called immediately after 4086/// ActOnDeclarator, when a C++ direct initializer is present. 4087/// e.g: "int x(1);" 4088void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4089 SourceLocation LParenLoc, 4090 MultiExprArg Exprs, 4091 SourceLocation *CommaLocs, 4092 SourceLocation RParenLoc) { 4093 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4094 Decl *RealDecl = Dcl.getAs<Decl>(); 4095 4096 // If there is no declaration, there was an error parsing it. Just ignore 4097 // the initializer. 4098 if (RealDecl == 0) 4099 return; 4100 4101 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4102 if (!VDecl) { 4103 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4104 RealDecl->setInvalidDecl(); 4105 return; 4106 } 4107 4108 // We will represent direct-initialization similarly to copy-initialization: 4109 // int x(1); -as-> int x = 1; 4110 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4111 // 4112 // Clients that want to distinguish between the two forms, can check for 4113 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4114 // A major benefit is that clients that don't particularly care about which 4115 // exactly form was it (like the CodeGen) can handle both cases without 4116 // special case code. 4117 4118 // C++ 8.5p11: 4119 // The form of initialization (using parentheses or '=') is generally 4120 // insignificant, but does matter when the entity being initialized has a 4121 // class type. 4122 QualType DeclInitType = VDecl->getType(); 4123 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4124 DeclInitType = Context.getBaseElementType(Array); 4125 4126 if (!VDecl->getType()->isDependentType() && 4127 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4128 diag::err_typecheck_decl_incomplete_type)) { 4129 VDecl->setInvalidDecl(); 4130 return; 4131 } 4132 4133 // The variable can not have an abstract class type. 4134 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4135 diag::err_abstract_type_in_decl, 4136 AbstractVariableType)) 4137 VDecl->setInvalidDecl(); 4138 4139 const VarDecl *Def; 4140 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4141 Diag(VDecl->getLocation(), diag::err_redefinition) 4142 << VDecl->getDeclName(); 4143 Diag(Def->getLocation(), diag::note_previous_definition); 4144 VDecl->setInvalidDecl(); 4145 return; 4146 } 4147 4148 // If either the declaration has a dependent type or if any of the 4149 // expressions is type-dependent, we represent the initialization 4150 // via a ParenListExpr for later use during template instantiation. 4151 if (VDecl->getType()->isDependentType() || 4152 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4153 // Let clients know that initialization was done with a direct initializer. 4154 VDecl->setCXXDirectInitializer(true); 4155 4156 // Store the initialization expressions as a ParenListExpr. 4157 unsigned NumExprs = Exprs.size(); 4158 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4159 (Expr **)Exprs.release(), 4160 NumExprs, RParenLoc)); 4161 return; 4162 } 4163 4164 // Capture the variable that is being initialized and the style of 4165 // initialization. 4166 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4167 4168 // FIXME: Poor source location information. 4169 InitializationKind Kind 4170 = InitializationKind::CreateDirect(VDecl->getLocation(), 4171 LParenLoc, RParenLoc); 4172 4173 InitializationSequence InitSeq(*this, Entity, Kind, 4174 (Expr**)Exprs.get(), Exprs.size()); 4175 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4176 if (Result.isInvalid()) { 4177 VDecl->setInvalidDecl(); 4178 return; 4179 } 4180 4181 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4182 VDecl->setInit(Result.takeAs<Expr>()); 4183 VDecl->setCXXDirectInitializer(true); 4184 4185 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4186 FinalizeVarWithDestructor(VDecl, Record); 4187} 4188 4189/// \brief Add the applicable constructor candidates for an initialization 4190/// by constructor. 4191static void AddConstructorInitializationCandidates(Sema &SemaRef, 4192 QualType ClassType, 4193 Expr **Args, 4194 unsigned NumArgs, 4195 InitializationKind Kind, 4196 OverloadCandidateSet &CandidateSet) { 4197 // C++ [dcl.init]p14: 4198 // If the initialization is direct-initialization, or if it is 4199 // copy-initialization where the cv-unqualified version of the 4200 // source type is the same class as, or a derived class of, the 4201 // class of the destination, constructors are considered. The 4202 // applicable constructors are enumerated (13.3.1.3), and the 4203 // best one is chosen through overload resolution (13.3). The 4204 // constructor so selected is called to initialize the object, 4205 // with the initializer expression(s) as its argument(s). If no 4206 // constructor applies, or the overload resolution is ambiguous, 4207 // the initialization is ill-formed. 4208 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4209 assert(ClassRec && "Can only initialize a class type here"); 4210 4211 // FIXME: When we decide not to synthesize the implicitly-declared 4212 // constructors, we'll need to make them appear here. 4213 4214 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4215 DeclarationName ConstructorName 4216 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4217 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4218 DeclContext::lookup_const_iterator Con, ConEnd; 4219 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4220 Con != ConEnd; ++Con) { 4221 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4222 4223 // Find the constructor (which may be a template). 4224 CXXConstructorDecl *Constructor = 0; 4225 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4226 if (ConstructorTmpl) 4227 Constructor 4228 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4229 else 4230 Constructor = cast<CXXConstructorDecl>(*Con); 4231 4232 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4233 (Kind.getKind() == InitializationKind::IK_Value) || 4234 (Kind.getKind() == InitializationKind::IK_Copy && 4235 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4236 ((Kind.getKind() == InitializationKind::IK_Default) && 4237 Constructor->isDefaultConstructor())) { 4238 if (ConstructorTmpl) 4239 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4240 /*ExplicitArgs*/ 0, 4241 Args, NumArgs, CandidateSet); 4242 else 4243 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4244 Args, NumArgs, CandidateSet); 4245 } 4246 } 4247} 4248 4249/// \brief Attempt to perform initialization by constructor 4250/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4251/// copy-initialization. 4252/// 4253/// This routine determines whether initialization by constructor is possible, 4254/// but it does not emit any diagnostics in the case where the initialization 4255/// is ill-formed. 4256/// 4257/// \param ClassType the type of the object being initialized, which must have 4258/// class type. 4259/// 4260/// \param Args the arguments provided to initialize the object 4261/// 4262/// \param NumArgs the number of arguments provided to initialize the object 4263/// 4264/// \param Kind the type of initialization being performed 4265/// 4266/// \returns the constructor used to initialize the object, if successful. 4267/// Otherwise, emits a diagnostic and returns NULL. 4268CXXConstructorDecl * 4269Sema::TryInitializationByConstructor(QualType ClassType, 4270 Expr **Args, unsigned NumArgs, 4271 SourceLocation Loc, 4272 InitializationKind Kind) { 4273 // Build the overload candidate set 4274 OverloadCandidateSet CandidateSet(Loc); 4275 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4276 CandidateSet); 4277 4278 // Determine whether we found a constructor we can use. 4279 OverloadCandidateSet::iterator Best; 4280 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4281 case OR_Success: 4282 case OR_Deleted: 4283 // We found a constructor. Return it. 4284 return cast<CXXConstructorDecl>(Best->Function); 4285 4286 case OR_No_Viable_Function: 4287 case OR_Ambiguous: 4288 // Overload resolution failed. Return nothing. 4289 return 0; 4290 } 4291 4292 // Silence GCC warning 4293 return 0; 4294} 4295 4296/// \brief Given a constructor and the set of arguments provided for the 4297/// constructor, convert the arguments and add any required default arguments 4298/// to form a proper call to this constructor. 4299/// 4300/// \returns true if an error occurred, false otherwise. 4301bool 4302Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4303 MultiExprArg ArgsPtr, 4304 SourceLocation Loc, 4305 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4306 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4307 unsigned NumArgs = ArgsPtr.size(); 4308 Expr **Args = (Expr **)ArgsPtr.get(); 4309 4310 const FunctionProtoType *Proto 4311 = Constructor->getType()->getAs<FunctionProtoType>(); 4312 assert(Proto && "Constructor without a prototype?"); 4313 unsigned NumArgsInProto = Proto->getNumArgs(); 4314 4315 // If too few arguments are available, we'll fill in the rest with defaults. 4316 if (NumArgs < NumArgsInProto) 4317 ConvertedArgs.reserve(NumArgsInProto); 4318 else 4319 ConvertedArgs.reserve(NumArgs); 4320 4321 VariadicCallType CallType = 4322 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4323 llvm::SmallVector<Expr *, 8> AllArgs; 4324 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4325 Proto, 0, Args, NumArgs, AllArgs, 4326 CallType); 4327 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4328 ConvertedArgs.push_back(AllArgs[i]); 4329 return Invalid; 4330} 4331 4332/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4333/// determine whether they are reference-related, 4334/// reference-compatible, reference-compatible with added 4335/// qualification, or incompatible, for use in C++ initialization by 4336/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4337/// type, and the first type (T1) is the pointee type of the reference 4338/// type being initialized. 4339Sema::ReferenceCompareResult 4340Sema::CompareReferenceRelationship(SourceLocation Loc, 4341 QualType OrigT1, QualType OrigT2, 4342 bool& DerivedToBase) { 4343 assert(!OrigT1->isReferenceType() && 4344 "T1 must be the pointee type of the reference type"); 4345 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4346 4347 QualType T1 = Context.getCanonicalType(OrigT1); 4348 QualType T2 = Context.getCanonicalType(OrigT2); 4349 Qualifiers T1Quals, T2Quals; 4350 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4351 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4352 4353 // C++ [dcl.init.ref]p4: 4354 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4355 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4356 // T1 is a base class of T2. 4357 if (UnqualT1 == UnqualT2) 4358 DerivedToBase = false; 4359 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4360 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4361 IsDerivedFrom(UnqualT2, UnqualT1)) 4362 DerivedToBase = true; 4363 else 4364 return Ref_Incompatible; 4365 4366 // At this point, we know that T1 and T2 are reference-related (at 4367 // least). 4368 4369 // If the type is an array type, promote the element qualifiers to the type 4370 // for comparison. 4371 if (isa<ArrayType>(T1) && T1Quals) 4372 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4373 if (isa<ArrayType>(T2) && T2Quals) 4374 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4375 4376 // C++ [dcl.init.ref]p4: 4377 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4378 // reference-related to T2 and cv1 is the same cv-qualification 4379 // as, or greater cv-qualification than, cv2. For purposes of 4380 // overload resolution, cases for which cv1 is greater 4381 // cv-qualification than cv2 are identified as 4382 // reference-compatible with added qualification (see 13.3.3.2). 4383 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4384 return Ref_Compatible; 4385 else if (T1.isMoreQualifiedThan(T2)) 4386 return Ref_Compatible_With_Added_Qualification; 4387 else 4388 return Ref_Related; 4389} 4390 4391/// CheckReferenceInit - Check the initialization of a reference 4392/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4393/// the initializer (either a simple initializer or an initializer 4394/// list), and DeclType is the type of the declaration. When ICS is 4395/// non-null, this routine will compute the implicit conversion 4396/// sequence according to C++ [over.ics.ref] and will not produce any 4397/// diagnostics; when ICS is null, it will emit diagnostics when any 4398/// errors are found. Either way, a return value of true indicates 4399/// that there was a failure, a return value of false indicates that 4400/// the reference initialization succeeded. 4401/// 4402/// When @p SuppressUserConversions, user-defined conversions are 4403/// suppressed. 4404/// When @p AllowExplicit, we also permit explicit user-defined 4405/// conversion functions. 4406/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4407/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4408/// This is used when this is called from a C-style cast. 4409bool 4410Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4411 SourceLocation DeclLoc, 4412 bool SuppressUserConversions, 4413 bool AllowExplicit, bool ForceRValue, 4414 ImplicitConversionSequence *ICS, 4415 bool IgnoreBaseAccess) { 4416 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4417 4418 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4419 QualType T2 = Init->getType(); 4420 4421 // If the initializer is the address of an overloaded function, try 4422 // to resolve the overloaded function. If all goes well, T2 is the 4423 // type of the resulting function. 4424 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4425 DeclAccessPair Found; 4426 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4427 ICS != 0, Found); 4428 if (Fn) { 4429 // Since we're performing this reference-initialization for 4430 // real, update the initializer with the resulting function. 4431 if (!ICS) { 4432 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4433 return true; 4434 4435 CheckAddressOfMemberAccess(Init, Found); 4436 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4437 } 4438 4439 T2 = Fn->getType(); 4440 } 4441 } 4442 4443 // Compute some basic properties of the types and the initializer. 4444 bool isRValRef = DeclType->isRValueReferenceType(); 4445 bool DerivedToBase = false; 4446 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4447 Init->isLvalue(Context); 4448 ReferenceCompareResult RefRelationship 4449 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4450 4451 // Most paths end in a failed conversion. 4452 if (ICS) { 4453 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4454 } 4455 4456 // C++ [dcl.init.ref]p5: 4457 // A reference to type "cv1 T1" is initialized by an expression 4458 // of type "cv2 T2" as follows: 4459 4460 // -- If the initializer expression 4461 4462 // Rvalue references cannot bind to lvalues (N2812). 4463 // There is absolutely no situation where they can. In particular, note that 4464 // this is ill-formed, even if B has a user-defined conversion to A&&: 4465 // B b; 4466 // A&& r = b; 4467 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4468 if (!ICS) 4469 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4470 << Init->getSourceRange(); 4471 return true; 4472 } 4473 4474 bool BindsDirectly = false; 4475 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4476 // reference-compatible with "cv2 T2," or 4477 // 4478 // Note that the bit-field check is skipped if we are just computing 4479 // the implicit conversion sequence (C++ [over.best.ics]p2). 4480 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4481 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4482 BindsDirectly = true; 4483 4484 if (ICS) { 4485 // C++ [over.ics.ref]p1: 4486 // When a parameter of reference type binds directly (8.5.3) 4487 // to an argument expression, the implicit conversion sequence 4488 // is the identity conversion, unless the argument expression 4489 // has a type that is a derived class of the parameter type, 4490 // in which case the implicit conversion sequence is a 4491 // derived-to-base Conversion (13.3.3.1). 4492 ICS->setStandard(); 4493 ICS->Standard.First = ICK_Identity; 4494 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4495 ICS->Standard.Third = ICK_Identity; 4496 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4497 ICS->Standard.setToType(0, T2); 4498 ICS->Standard.setToType(1, T1); 4499 ICS->Standard.setToType(2, T1); 4500 ICS->Standard.ReferenceBinding = true; 4501 ICS->Standard.DirectBinding = true; 4502 ICS->Standard.RRefBinding = false; 4503 ICS->Standard.CopyConstructor = 0; 4504 4505 // Nothing more to do: the inaccessibility/ambiguity check for 4506 // derived-to-base conversions is suppressed when we're 4507 // computing the implicit conversion sequence (C++ 4508 // [over.best.ics]p2). 4509 return false; 4510 } else { 4511 // Perform the conversion. 4512 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4513 if (DerivedToBase) 4514 CK = CastExpr::CK_DerivedToBase; 4515 else if(CheckExceptionSpecCompatibility(Init, T1)) 4516 return true; 4517 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4518 } 4519 } 4520 4521 // -- has a class type (i.e., T2 is a class type) and can be 4522 // implicitly converted to an lvalue of type "cv3 T3," 4523 // where "cv1 T1" is reference-compatible with "cv3 T3" 4524 // 92) (this conversion is selected by enumerating the 4525 // applicable conversion functions (13.3.1.6) and choosing 4526 // the best one through overload resolution (13.3)), 4527 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4528 !RequireCompleteType(DeclLoc, T2, 0)) { 4529 CXXRecordDecl *T2RecordDecl 4530 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4531 4532 OverloadCandidateSet CandidateSet(DeclLoc); 4533 const UnresolvedSetImpl *Conversions 4534 = T2RecordDecl->getVisibleConversionFunctions(); 4535 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4536 E = Conversions->end(); I != E; ++I) { 4537 NamedDecl *D = *I; 4538 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4539 if (isa<UsingShadowDecl>(D)) 4540 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4541 4542 FunctionTemplateDecl *ConvTemplate 4543 = dyn_cast<FunctionTemplateDecl>(D); 4544 CXXConversionDecl *Conv; 4545 if (ConvTemplate) 4546 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4547 else 4548 Conv = cast<CXXConversionDecl>(D); 4549 4550 // If the conversion function doesn't return a reference type, 4551 // it can't be considered for this conversion. 4552 if (Conv->getConversionType()->isLValueReferenceType() && 4553 (AllowExplicit || !Conv->isExplicit())) { 4554 if (ConvTemplate) 4555 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4556 Init, DeclType, CandidateSet); 4557 else 4558 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4559 DeclType, CandidateSet); 4560 } 4561 } 4562 4563 OverloadCandidateSet::iterator Best; 4564 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4565 case OR_Success: 4566 // C++ [over.ics.ref]p1: 4567 // 4568 // [...] If the parameter binds directly to the result of 4569 // applying a conversion function to the argument 4570 // expression, the implicit conversion sequence is a 4571 // user-defined conversion sequence (13.3.3.1.2), with the 4572 // second standard conversion sequence either an identity 4573 // conversion or, if the conversion function returns an 4574 // entity of a type that is a derived class of the parameter 4575 // type, a derived-to-base Conversion. 4576 if (!Best->FinalConversion.DirectBinding) 4577 break; 4578 4579 // This is a direct binding. 4580 BindsDirectly = true; 4581 4582 if (ICS) { 4583 ICS->setUserDefined(); 4584 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4585 ICS->UserDefined.After = Best->FinalConversion; 4586 ICS->UserDefined.ConversionFunction = Best->Function; 4587 ICS->UserDefined.EllipsisConversion = false; 4588 assert(ICS->UserDefined.After.ReferenceBinding && 4589 ICS->UserDefined.After.DirectBinding && 4590 "Expected a direct reference binding!"); 4591 return false; 4592 } else { 4593 OwningExprResult InitConversion = 4594 BuildCXXCastArgument(DeclLoc, QualType(), 4595 CastExpr::CK_UserDefinedConversion, 4596 cast<CXXMethodDecl>(Best->Function), 4597 Owned(Init)); 4598 Init = InitConversion.takeAs<Expr>(); 4599 4600 if (CheckExceptionSpecCompatibility(Init, T1)) 4601 return true; 4602 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4603 /*isLvalue=*/true); 4604 } 4605 break; 4606 4607 case OR_Ambiguous: 4608 if (ICS) { 4609 ICS->setAmbiguous(); 4610 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4611 Cand != CandidateSet.end(); ++Cand) 4612 if (Cand->Viable) 4613 ICS->Ambiguous.addConversion(Cand->Function); 4614 break; 4615 } 4616 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4617 << Init->getSourceRange(); 4618 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4619 return true; 4620 4621 case OR_No_Viable_Function: 4622 case OR_Deleted: 4623 // There was no suitable conversion, or we found a deleted 4624 // conversion; continue with other checks. 4625 break; 4626 } 4627 } 4628 4629 if (BindsDirectly) { 4630 // C++ [dcl.init.ref]p4: 4631 // [...] In all cases where the reference-related or 4632 // reference-compatible relationship of two types is used to 4633 // establish the validity of a reference binding, and T1 is a 4634 // base class of T2, a program that necessitates such a binding 4635 // is ill-formed if T1 is an inaccessible (clause 11) or 4636 // ambiguous (10.2) base class of T2. 4637 // 4638 // Note that we only check this condition when we're allowed to 4639 // complain about errors, because we should not be checking for 4640 // ambiguity (or inaccessibility) unless the reference binding 4641 // actually happens. 4642 if (DerivedToBase) 4643 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4644 Init->getSourceRange(), 4645 IgnoreBaseAccess); 4646 else 4647 return false; 4648 } 4649 4650 // -- Otherwise, the reference shall be to a non-volatile const 4651 // type (i.e., cv1 shall be const), or the reference shall be an 4652 // rvalue reference and the initializer expression shall be an rvalue. 4653 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4654 if (!ICS) 4655 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4656 << T1.isVolatileQualified() 4657 << T1 << int(InitLvalue != Expr::LV_Valid) 4658 << T2 << Init->getSourceRange(); 4659 return true; 4660 } 4661 4662 // -- If the initializer expression is an rvalue, with T2 a 4663 // class type, and "cv1 T1" is reference-compatible with 4664 // "cv2 T2," the reference is bound in one of the 4665 // following ways (the choice is implementation-defined): 4666 // 4667 // -- The reference is bound to the object represented by 4668 // the rvalue (see 3.10) or to a sub-object within that 4669 // object. 4670 // 4671 // -- A temporary of type "cv1 T2" [sic] is created, and 4672 // a constructor is called to copy the entire rvalue 4673 // object into the temporary. The reference is bound to 4674 // the temporary or to a sub-object within the 4675 // temporary. 4676 // 4677 // The constructor that would be used to make the copy 4678 // shall be callable whether or not the copy is actually 4679 // done. 4680 // 4681 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4682 // freedom, so we will always take the first option and never build 4683 // a temporary in this case. FIXME: We will, however, have to check 4684 // for the presence of a copy constructor in C++98/03 mode. 4685 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4686 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4687 if (ICS) { 4688 ICS->setStandard(); 4689 ICS->Standard.First = ICK_Identity; 4690 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4691 ICS->Standard.Third = ICK_Identity; 4692 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4693 ICS->Standard.setToType(0, T2); 4694 ICS->Standard.setToType(1, T1); 4695 ICS->Standard.setToType(2, T1); 4696 ICS->Standard.ReferenceBinding = true; 4697 ICS->Standard.DirectBinding = false; 4698 ICS->Standard.RRefBinding = isRValRef; 4699 ICS->Standard.CopyConstructor = 0; 4700 } else { 4701 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4702 if (DerivedToBase) 4703 CK = CastExpr::CK_DerivedToBase; 4704 else if(CheckExceptionSpecCompatibility(Init, T1)) 4705 return true; 4706 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4707 } 4708 return false; 4709 } 4710 4711 // -- Otherwise, a temporary of type "cv1 T1" is created and 4712 // initialized from the initializer expression using the 4713 // rules for a non-reference copy initialization (8.5). The 4714 // reference is then bound to the temporary. If T1 is 4715 // reference-related to T2, cv1 must be the same 4716 // cv-qualification as, or greater cv-qualification than, 4717 // cv2; otherwise, the program is ill-formed. 4718 if (RefRelationship == Ref_Related) { 4719 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4720 // we would be reference-compatible or reference-compatible with 4721 // added qualification. But that wasn't the case, so the reference 4722 // initialization fails. 4723 if (!ICS) 4724 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4725 << T1 << int(InitLvalue != Expr::LV_Valid) 4726 << T2 << Init->getSourceRange(); 4727 return true; 4728 } 4729 4730 // If at least one of the types is a class type, the types are not 4731 // related, and we aren't allowed any user conversions, the 4732 // reference binding fails. This case is important for breaking 4733 // recursion, since TryImplicitConversion below will attempt to 4734 // create a temporary through the use of a copy constructor. 4735 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4736 (T1->isRecordType() || T2->isRecordType())) { 4737 if (!ICS) 4738 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4739 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4740 return true; 4741 } 4742 4743 // Actually try to convert the initializer to T1. 4744 if (ICS) { 4745 // C++ [over.ics.ref]p2: 4746 // 4747 // When a parameter of reference type is not bound directly to 4748 // an argument expression, the conversion sequence is the one 4749 // required to convert the argument expression to the 4750 // underlying type of the reference according to 4751 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4752 // to copy-initializing a temporary of the underlying type with 4753 // the argument expression. Any difference in top-level 4754 // cv-qualification is subsumed by the initialization itself 4755 // and does not constitute a conversion. 4756 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4757 /*AllowExplicit=*/false, 4758 /*ForceRValue=*/false, 4759 /*InOverloadResolution=*/false); 4760 4761 // Of course, that's still a reference binding. 4762 if (ICS->isStandard()) { 4763 ICS->Standard.ReferenceBinding = true; 4764 ICS->Standard.RRefBinding = isRValRef; 4765 } else if (ICS->isUserDefined()) { 4766 ICS->UserDefined.After.ReferenceBinding = true; 4767 ICS->UserDefined.After.RRefBinding = isRValRef; 4768 } 4769 return ICS->isBad(); 4770 } else { 4771 ImplicitConversionSequence Conversions; 4772 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4773 false, false, 4774 Conversions); 4775 if (badConversion) { 4776 if (Conversions.isAmbiguous()) { 4777 Diag(DeclLoc, 4778 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4779 for (int j = Conversions.Ambiguous.conversions().size()-1; 4780 j >= 0; j--) { 4781 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4782 NoteOverloadCandidate(Func); 4783 } 4784 } 4785 else { 4786 if (isRValRef) 4787 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4788 << Init->getSourceRange(); 4789 else 4790 Diag(DeclLoc, diag::err_invalid_initialization) 4791 << DeclType << Init->getType() << Init->getSourceRange(); 4792 } 4793 } 4794 return badConversion; 4795 } 4796} 4797 4798static inline bool 4799CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4800 const FunctionDecl *FnDecl) { 4801 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4802 if (isa<NamespaceDecl>(DC)) { 4803 return SemaRef.Diag(FnDecl->getLocation(), 4804 diag::err_operator_new_delete_declared_in_namespace) 4805 << FnDecl->getDeclName(); 4806 } 4807 4808 if (isa<TranslationUnitDecl>(DC) && 4809 FnDecl->getStorageClass() == FunctionDecl::Static) { 4810 return SemaRef.Diag(FnDecl->getLocation(), 4811 diag::err_operator_new_delete_declared_static) 4812 << FnDecl->getDeclName(); 4813 } 4814 4815 return false; 4816} 4817 4818static inline bool 4819CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4820 CanQualType ExpectedResultType, 4821 CanQualType ExpectedFirstParamType, 4822 unsigned DependentParamTypeDiag, 4823 unsigned InvalidParamTypeDiag) { 4824 QualType ResultType = 4825 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4826 4827 // Check that the result type is not dependent. 4828 if (ResultType->isDependentType()) 4829 return SemaRef.Diag(FnDecl->getLocation(), 4830 diag::err_operator_new_delete_dependent_result_type) 4831 << FnDecl->getDeclName() << ExpectedResultType; 4832 4833 // Check that the result type is what we expect. 4834 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4835 return SemaRef.Diag(FnDecl->getLocation(), 4836 diag::err_operator_new_delete_invalid_result_type) 4837 << FnDecl->getDeclName() << ExpectedResultType; 4838 4839 // A function template must have at least 2 parameters. 4840 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4841 return SemaRef.Diag(FnDecl->getLocation(), 4842 diag::err_operator_new_delete_template_too_few_parameters) 4843 << FnDecl->getDeclName(); 4844 4845 // The function decl must have at least 1 parameter. 4846 if (FnDecl->getNumParams() == 0) 4847 return SemaRef.Diag(FnDecl->getLocation(), 4848 diag::err_operator_new_delete_too_few_parameters) 4849 << FnDecl->getDeclName(); 4850 4851 // Check the the first parameter type is not dependent. 4852 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4853 if (FirstParamType->isDependentType()) 4854 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4855 << FnDecl->getDeclName() << ExpectedFirstParamType; 4856 4857 // Check that the first parameter type is what we expect. 4858 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4859 ExpectedFirstParamType) 4860 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4861 << FnDecl->getDeclName() << ExpectedFirstParamType; 4862 4863 return false; 4864} 4865 4866static bool 4867CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4868 // C++ [basic.stc.dynamic.allocation]p1: 4869 // A program is ill-formed if an allocation function is declared in a 4870 // namespace scope other than global scope or declared static in global 4871 // scope. 4872 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4873 return true; 4874 4875 CanQualType SizeTy = 4876 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4877 4878 // C++ [basic.stc.dynamic.allocation]p1: 4879 // The return type shall be void*. The first parameter shall have type 4880 // std::size_t. 4881 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4882 SizeTy, 4883 diag::err_operator_new_dependent_param_type, 4884 diag::err_operator_new_param_type)) 4885 return true; 4886 4887 // C++ [basic.stc.dynamic.allocation]p1: 4888 // The first parameter shall not have an associated default argument. 4889 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4890 return SemaRef.Diag(FnDecl->getLocation(), 4891 diag::err_operator_new_default_arg) 4892 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4893 4894 return false; 4895} 4896 4897static bool 4898CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4899 // C++ [basic.stc.dynamic.deallocation]p1: 4900 // A program is ill-formed if deallocation functions are declared in a 4901 // namespace scope other than global scope or declared static in global 4902 // scope. 4903 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4904 return true; 4905 4906 // C++ [basic.stc.dynamic.deallocation]p2: 4907 // Each deallocation function shall return void and its first parameter 4908 // shall be void*. 4909 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4910 SemaRef.Context.VoidPtrTy, 4911 diag::err_operator_delete_dependent_param_type, 4912 diag::err_operator_delete_param_type)) 4913 return true; 4914 4915 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4916 if (FirstParamType->isDependentType()) 4917 return SemaRef.Diag(FnDecl->getLocation(), 4918 diag::err_operator_delete_dependent_param_type) 4919 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4920 4921 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4922 SemaRef.Context.VoidPtrTy) 4923 return SemaRef.Diag(FnDecl->getLocation(), 4924 diag::err_operator_delete_param_type) 4925 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4926 4927 return false; 4928} 4929 4930/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4931/// of this overloaded operator is well-formed. If so, returns false; 4932/// otherwise, emits appropriate diagnostics and returns true. 4933bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4934 assert(FnDecl && FnDecl->isOverloadedOperator() && 4935 "Expected an overloaded operator declaration"); 4936 4937 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4938 4939 // C++ [over.oper]p5: 4940 // The allocation and deallocation functions, operator new, 4941 // operator new[], operator delete and operator delete[], are 4942 // described completely in 3.7.3. The attributes and restrictions 4943 // found in the rest of this subclause do not apply to them unless 4944 // explicitly stated in 3.7.3. 4945 if (Op == OO_Delete || Op == OO_Array_Delete) 4946 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4947 4948 if (Op == OO_New || Op == OO_Array_New) 4949 return CheckOperatorNewDeclaration(*this, FnDecl); 4950 4951 // C++ [over.oper]p6: 4952 // An operator function shall either be a non-static member 4953 // function or be a non-member function and have at least one 4954 // parameter whose type is a class, a reference to a class, an 4955 // enumeration, or a reference to an enumeration. 4956 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4957 if (MethodDecl->isStatic()) 4958 return Diag(FnDecl->getLocation(), 4959 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4960 } else { 4961 bool ClassOrEnumParam = false; 4962 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4963 ParamEnd = FnDecl->param_end(); 4964 Param != ParamEnd; ++Param) { 4965 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4966 if (ParamType->isDependentType() || ParamType->isRecordType() || 4967 ParamType->isEnumeralType()) { 4968 ClassOrEnumParam = true; 4969 break; 4970 } 4971 } 4972 4973 if (!ClassOrEnumParam) 4974 return Diag(FnDecl->getLocation(), 4975 diag::err_operator_overload_needs_class_or_enum) 4976 << FnDecl->getDeclName(); 4977 } 4978 4979 // C++ [over.oper]p8: 4980 // An operator function cannot have default arguments (8.3.6), 4981 // except where explicitly stated below. 4982 // 4983 // Only the function-call operator allows default arguments 4984 // (C++ [over.call]p1). 4985 if (Op != OO_Call) { 4986 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4987 Param != FnDecl->param_end(); ++Param) { 4988 if ((*Param)->hasDefaultArg()) 4989 return Diag((*Param)->getLocation(), 4990 diag::err_operator_overload_default_arg) 4991 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4992 } 4993 } 4994 4995 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4996 { false, false, false } 4997#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4998 , { Unary, Binary, MemberOnly } 4999#include "clang/Basic/OperatorKinds.def" 5000 }; 5001 5002 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5003 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5004 bool MustBeMemberOperator = OperatorUses[Op][2]; 5005 5006 // C++ [over.oper]p8: 5007 // [...] Operator functions cannot have more or fewer parameters 5008 // than the number required for the corresponding operator, as 5009 // described in the rest of this subclause. 5010 unsigned NumParams = FnDecl->getNumParams() 5011 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5012 if (Op != OO_Call && 5013 ((NumParams == 1 && !CanBeUnaryOperator) || 5014 (NumParams == 2 && !CanBeBinaryOperator) || 5015 (NumParams < 1) || (NumParams > 2))) { 5016 // We have the wrong number of parameters. 5017 unsigned ErrorKind; 5018 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5019 ErrorKind = 2; // 2 -> unary or binary. 5020 } else if (CanBeUnaryOperator) { 5021 ErrorKind = 0; // 0 -> unary 5022 } else { 5023 assert(CanBeBinaryOperator && 5024 "All non-call overloaded operators are unary or binary!"); 5025 ErrorKind = 1; // 1 -> binary 5026 } 5027 5028 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5029 << FnDecl->getDeclName() << NumParams << ErrorKind; 5030 } 5031 5032 // Overloaded operators other than operator() cannot be variadic. 5033 if (Op != OO_Call && 5034 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5035 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5036 << FnDecl->getDeclName(); 5037 } 5038 5039 // Some operators must be non-static member functions. 5040 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5041 return Diag(FnDecl->getLocation(), 5042 diag::err_operator_overload_must_be_member) 5043 << FnDecl->getDeclName(); 5044 } 5045 5046 // C++ [over.inc]p1: 5047 // The user-defined function called operator++ implements the 5048 // prefix and postfix ++ operator. If this function is a member 5049 // function with no parameters, or a non-member function with one 5050 // parameter of class or enumeration type, it defines the prefix 5051 // increment operator ++ for objects of that type. If the function 5052 // is a member function with one parameter (which shall be of type 5053 // int) or a non-member function with two parameters (the second 5054 // of which shall be of type int), it defines the postfix 5055 // increment operator ++ for objects of that type. 5056 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5057 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5058 bool ParamIsInt = false; 5059 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5060 ParamIsInt = BT->getKind() == BuiltinType::Int; 5061 5062 if (!ParamIsInt) 5063 return Diag(LastParam->getLocation(), 5064 diag::err_operator_overload_post_incdec_must_be_int) 5065 << LastParam->getType() << (Op == OO_MinusMinus); 5066 } 5067 5068 // Notify the class if it got an assignment operator. 5069 if (Op == OO_Equal) { 5070 // Would have returned earlier otherwise. 5071 assert(isa<CXXMethodDecl>(FnDecl) && 5072 "Overloaded = not member, but not filtered."); 5073 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5074 Method->getParent()->addedAssignmentOperator(Context, Method); 5075 } 5076 5077 return false; 5078} 5079 5080/// CheckLiteralOperatorDeclaration - Check whether the declaration 5081/// of this literal operator function is well-formed. If so, returns 5082/// false; otherwise, emits appropriate diagnostics and returns true. 5083bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5084 DeclContext *DC = FnDecl->getDeclContext(); 5085 Decl::Kind Kind = DC->getDeclKind(); 5086 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5087 Kind != Decl::LinkageSpec) { 5088 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5089 << FnDecl->getDeclName(); 5090 return true; 5091 } 5092 5093 bool Valid = false; 5094 5095 // FIXME: Check for the one valid template signature 5096 // template <char...> type operator "" name(); 5097 5098 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5099 // Check the first parameter 5100 QualType T = (*Param)->getType(); 5101 5102 // unsigned long long int and long double are allowed, but only 5103 // alone. 5104 // We also allow any character type; their omission seems to be a bug 5105 // in n3000 5106 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5107 Context.hasSameType(T, Context.LongDoubleTy) || 5108 Context.hasSameType(T, Context.CharTy) || 5109 Context.hasSameType(T, Context.WCharTy) || 5110 Context.hasSameType(T, Context.Char16Ty) || 5111 Context.hasSameType(T, Context.Char32Ty)) { 5112 if (++Param == FnDecl->param_end()) 5113 Valid = true; 5114 goto FinishedParams; 5115 } 5116 5117 // Otherwise it must be a pointer to const; let's strip those. 5118 const PointerType *PT = T->getAs<PointerType>(); 5119 if (!PT) 5120 goto FinishedParams; 5121 T = PT->getPointeeType(); 5122 if (!T.isConstQualified()) 5123 goto FinishedParams; 5124 T = T.getUnqualifiedType(); 5125 5126 // Move on to the second parameter; 5127 ++Param; 5128 5129 // If there is no second parameter, the first must be a const char * 5130 if (Param == FnDecl->param_end()) { 5131 if (Context.hasSameType(T, Context.CharTy)) 5132 Valid = true; 5133 goto FinishedParams; 5134 } 5135 5136 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5137 // are allowed as the first parameter to a two-parameter function 5138 if (!(Context.hasSameType(T, Context.CharTy) || 5139 Context.hasSameType(T, Context.WCharTy) || 5140 Context.hasSameType(T, Context.Char16Ty) || 5141 Context.hasSameType(T, Context.Char32Ty))) 5142 goto FinishedParams; 5143 5144 // The second and final parameter must be an std::size_t 5145 T = (*Param)->getType().getUnqualifiedType(); 5146 if (Context.hasSameType(T, Context.getSizeType()) && 5147 ++Param == FnDecl->param_end()) 5148 Valid = true; 5149 } 5150 5151 // FIXME: This diagnostic is absolutely terrible. 5152FinishedParams: 5153 if (!Valid) { 5154 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5155 << FnDecl->getDeclName(); 5156 return true; 5157 } 5158 5159 return false; 5160} 5161 5162/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5163/// linkage specification, including the language and (if present) 5164/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5165/// the location of the language string literal, which is provided 5166/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5167/// the '{' brace. Otherwise, this linkage specification does not 5168/// have any braces. 5169Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5170 SourceLocation ExternLoc, 5171 SourceLocation LangLoc, 5172 const char *Lang, 5173 unsigned StrSize, 5174 SourceLocation LBraceLoc) { 5175 LinkageSpecDecl::LanguageIDs Language; 5176 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5177 Language = LinkageSpecDecl::lang_c; 5178 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5179 Language = LinkageSpecDecl::lang_cxx; 5180 else { 5181 Diag(LangLoc, diag::err_bad_language); 5182 return DeclPtrTy(); 5183 } 5184 5185 // FIXME: Add all the various semantics of linkage specifications 5186 5187 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5188 LangLoc, Language, 5189 LBraceLoc.isValid()); 5190 CurContext->addDecl(D); 5191 PushDeclContext(S, D); 5192 return DeclPtrTy::make(D); 5193} 5194 5195/// ActOnFinishLinkageSpecification - Completely the definition of 5196/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5197/// valid, it's the position of the closing '}' brace in a linkage 5198/// specification that uses braces. 5199Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5200 DeclPtrTy LinkageSpec, 5201 SourceLocation RBraceLoc) { 5202 if (LinkageSpec) 5203 PopDeclContext(); 5204 return LinkageSpec; 5205} 5206 5207/// \brief Perform semantic analysis for the variable declaration that 5208/// occurs within a C++ catch clause, returning the newly-created 5209/// variable. 5210VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5211 TypeSourceInfo *TInfo, 5212 IdentifierInfo *Name, 5213 SourceLocation Loc, 5214 SourceRange Range) { 5215 bool Invalid = false; 5216 5217 // Arrays and functions decay. 5218 if (ExDeclType->isArrayType()) 5219 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5220 else if (ExDeclType->isFunctionType()) 5221 ExDeclType = Context.getPointerType(ExDeclType); 5222 5223 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5224 // The exception-declaration shall not denote a pointer or reference to an 5225 // incomplete type, other than [cv] void*. 5226 // N2844 forbids rvalue references. 5227 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5228 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5229 Invalid = true; 5230 } 5231 5232 // GCC allows catching pointers and references to incomplete types 5233 // as an extension; so do we, but we warn by default. 5234 5235 QualType BaseType = ExDeclType; 5236 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5237 unsigned DK = diag::err_catch_incomplete; 5238 bool IncompleteCatchIsInvalid = true; 5239 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5240 BaseType = Ptr->getPointeeType(); 5241 Mode = 1; 5242 DK = diag::ext_catch_incomplete_ptr; 5243 IncompleteCatchIsInvalid = false; 5244 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5245 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5246 BaseType = Ref->getPointeeType(); 5247 Mode = 2; 5248 DK = diag::ext_catch_incomplete_ref; 5249 IncompleteCatchIsInvalid = false; 5250 } 5251 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5252 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5253 IncompleteCatchIsInvalid) 5254 Invalid = true; 5255 5256 if (!Invalid && !ExDeclType->isDependentType() && 5257 RequireNonAbstractType(Loc, ExDeclType, 5258 diag::err_abstract_type_in_decl, 5259 AbstractVariableType)) 5260 Invalid = true; 5261 5262 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5263 Name, ExDeclType, TInfo, VarDecl::None); 5264 5265 if (!Invalid) { 5266 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5267 // C++ [except.handle]p16: 5268 // The object declared in an exception-declaration or, if the 5269 // exception-declaration does not specify a name, a temporary (12.2) is 5270 // copy-initialized (8.5) from the exception object. [...] 5271 // The object is destroyed when the handler exits, after the destruction 5272 // of any automatic objects initialized within the handler. 5273 // 5274 // We just pretend to initialize the object with itself, then make sure 5275 // it can be destroyed later. 5276 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5277 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5278 Loc, ExDeclType, 0); 5279 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5280 SourceLocation()); 5281 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5282 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5283 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5284 if (Result.isInvalid()) 5285 Invalid = true; 5286 else 5287 FinalizeVarWithDestructor(ExDecl, RecordTy); 5288 } 5289 } 5290 5291 if (Invalid) 5292 ExDecl->setInvalidDecl(); 5293 5294 return ExDecl; 5295} 5296 5297/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5298/// handler. 5299Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5300 TypeSourceInfo *TInfo = 0; 5301 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5302 5303 bool Invalid = D.isInvalidType(); 5304 IdentifierInfo *II = D.getIdentifier(); 5305 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5306 // The scope should be freshly made just for us. There is just no way 5307 // it contains any previous declaration. 5308 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5309 if (PrevDecl->isTemplateParameter()) { 5310 // Maybe we will complain about the shadowed template parameter. 5311 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5312 } 5313 } 5314 5315 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5316 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5317 << D.getCXXScopeSpec().getRange(); 5318 Invalid = true; 5319 } 5320 5321 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5322 D.getIdentifier(), 5323 D.getIdentifierLoc(), 5324 D.getDeclSpec().getSourceRange()); 5325 5326 if (Invalid) 5327 ExDecl->setInvalidDecl(); 5328 5329 // Add the exception declaration into this scope. 5330 if (II) 5331 PushOnScopeChains(ExDecl, S); 5332 else 5333 CurContext->addDecl(ExDecl); 5334 5335 ProcessDeclAttributes(S, ExDecl, D); 5336 return DeclPtrTy::make(ExDecl); 5337} 5338 5339Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5340 ExprArg assertexpr, 5341 ExprArg assertmessageexpr) { 5342 Expr *AssertExpr = (Expr *)assertexpr.get(); 5343 StringLiteral *AssertMessage = 5344 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5345 5346 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5347 llvm::APSInt Value(32); 5348 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5349 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5350 AssertExpr->getSourceRange(); 5351 return DeclPtrTy(); 5352 } 5353 5354 if (Value == 0) { 5355 Diag(AssertLoc, diag::err_static_assert_failed) 5356 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5357 } 5358 } 5359 5360 assertexpr.release(); 5361 assertmessageexpr.release(); 5362 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5363 AssertExpr, AssertMessage); 5364 5365 CurContext->addDecl(Decl); 5366 return DeclPtrTy::make(Decl); 5367} 5368 5369/// Handle a friend type declaration. This works in tandem with 5370/// ActOnTag. 5371/// 5372/// Notes on friend class templates: 5373/// 5374/// We generally treat friend class declarations as if they were 5375/// declaring a class. So, for example, the elaborated type specifier 5376/// in a friend declaration is required to obey the restrictions of a 5377/// class-head (i.e. no typedefs in the scope chain), template 5378/// parameters are required to match up with simple template-ids, &c. 5379/// However, unlike when declaring a template specialization, it's 5380/// okay to refer to a template specialization without an empty 5381/// template parameter declaration, e.g. 5382/// friend class A<T>::B<unsigned>; 5383/// We permit this as a special case; if there are any template 5384/// parameters present at all, require proper matching, i.e. 5385/// template <> template <class T> friend class A<int>::B; 5386Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5387 MultiTemplateParamsArg TempParams) { 5388 SourceLocation Loc = DS.getSourceRange().getBegin(); 5389 5390 assert(DS.isFriendSpecified()); 5391 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5392 5393 // Try to convert the decl specifier to a type. This works for 5394 // friend templates because ActOnTag never produces a ClassTemplateDecl 5395 // for a TUK_Friend. 5396 Declarator TheDeclarator(DS, Declarator::MemberContext); 5397 TypeSourceInfo *TSI; 5398 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5399 if (TheDeclarator.isInvalidType()) 5400 return DeclPtrTy(); 5401 5402 // This is definitely an error in C++98. It's probably meant to 5403 // be forbidden in C++0x, too, but the specification is just 5404 // poorly written. 5405 // 5406 // The problem is with declarations like the following: 5407 // template <T> friend A<T>::foo; 5408 // where deciding whether a class C is a friend or not now hinges 5409 // on whether there exists an instantiation of A that causes 5410 // 'foo' to equal C. There are restrictions on class-heads 5411 // (which we declare (by fiat) elaborated friend declarations to 5412 // be) that makes this tractable. 5413 // 5414 // FIXME: handle "template <> friend class A<T>;", which 5415 // is possibly well-formed? Who even knows? 5416 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5417 Diag(Loc, diag::err_tagless_friend_type_template) 5418 << DS.getSourceRange(); 5419 return DeclPtrTy(); 5420 } 5421 5422 // C++ [class.friend]p2: 5423 // An elaborated-type-specifier shall be used in a friend declaration 5424 // for a class.* 5425 // * The class-key of the elaborated-type-specifier is required. 5426 // This is one of the rare places in Clang where it's legitimate to 5427 // ask about the "spelling" of the type. 5428 if (!getLangOptions().CPlusPlus0x && !T->isElaboratedTypeSpecifier()) { 5429 // If we evaluated the type to a record type, suggest putting 5430 // a tag in front. 5431 if (const RecordType *RT = T->getAs<RecordType>()) { 5432 RecordDecl *RD = RT->getDecl(); 5433 5434 std::string InsertionText = std::string(" ") + RD->getKindName(); 5435 5436 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5437 << (unsigned) RD->getTagKind() 5438 << T 5439 << SourceRange(DS.getFriendSpecLoc()) 5440 << FixItHint::CreateInsertion(DS.getTypeSpecTypeLoc(), InsertionText); 5441 return DeclPtrTy(); 5442 }else { 5443 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5444 << DS.getSourceRange(); 5445 return DeclPtrTy(); 5446 } 5447 } 5448 5449 // Enum types cannot be friends. 5450 if (T->getAs<EnumType>()) { 5451 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5452 << SourceRange(DS.getFriendSpecLoc()); 5453 return DeclPtrTy(); 5454 } 5455 5456 // C++98 [class.friend]p1: A friend of a class is a function 5457 // or class that is not a member of the class . . . 5458 // This is fixed in DR77, which just barely didn't make the C++03 5459 // deadline. It's also a very silly restriction that seriously 5460 // affects inner classes and which nobody else seems to implement; 5461 // thus we never diagnose it, not even in -pedantic. 5462 // 5463 // But note that we could warn about it: it's always useless to 5464 // friend one of your own members (it's not, however, worthless to 5465 // friend a member of an arbitrary specialization of your template). 5466 5467 Decl *D; 5468 if (TempParams.size()) 5469 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5470 TempParams.size(), 5471 (TemplateParameterList**) TempParams.release(), 5472 TSI, 5473 DS.getFriendSpecLoc()); 5474 else 5475 D = FriendDecl::Create(Context, CurContext, Loc, TSI, 5476 DS.getFriendSpecLoc()); 5477 D->setAccess(AS_public); 5478 CurContext->addDecl(D); 5479 5480 return DeclPtrTy::make(D); 5481} 5482 5483Sema::DeclPtrTy 5484Sema::ActOnFriendFunctionDecl(Scope *S, 5485 Declarator &D, 5486 bool IsDefinition, 5487 MultiTemplateParamsArg TemplateParams) { 5488 const DeclSpec &DS = D.getDeclSpec(); 5489 5490 assert(DS.isFriendSpecified()); 5491 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5492 5493 SourceLocation Loc = D.getIdentifierLoc(); 5494 TypeSourceInfo *TInfo = 0; 5495 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5496 5497 // C++ [class.friend]p1 5498 // A friend of a class is a function or class.... 5499 // Note that this sees through typedefs, which is intended. 5500 // It *doesn't* see through dependent types, which is correct 5501 // according to [temp.arg.type]p3: 5502 // If a declaration acquires a function type through a 5503 // type dependent on a template-parameter and this causes 5504 // a declaration that does not use the syntactic form of a 5505 // function declarator to have a function type, the program 5506 // is ill-formed. 5507 if (!T->isFunctionType()) { 5508 Diag(Loc, diag::err_unexpected_friend); 5509 5510 // It might be worthwhile to try to recover by creating an 5511 // appropriate declaration. 5512 return DeclPtrTy(); 5513 } 5514 5515 // C++ [namespace.memdef]p3 5516 // - If a friend declaration in a non-local class first declares a 5517 // class or function, the friend class or function is a member 5518 // of the innermost enclosing namespace. 5519 // - The name of the friend is not found by simple name lookup 5520 // until a matching declaration is provided in that namespace 5521 // scope (either before or after the class declaration granting 5522 // friendship). 5523 // - If a friend function is called, its name may be found by the 5524 // name lookup that considers functions from namespaces and 5525 // classes associated with the types of the function arguments. 5526 // - When looking for a prior declaration of a class or a function 5527 // declared as a friend, scopes outside the innermost enclosing 5528 // namespace scope are not considered. 5529 5530 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5531 DeclarationName Name = GetNameForDeclarator(D); 5532 assert(Name); 5533 5534 // The context we found the declaration in, or in which we should 5535 // create the declaration. 5536 DeclContext *DC; 5537 5538 // FIXME: handle local classes 5539 5540 // Recover from invalid scope qualifiers as if they just weren't there. 5541 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5542 ForRedeclaration); 5543 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5544 // FIXME: RequireCompleteDeclContext 5545 DC = computeDeclContext(ScopeQual); 5546 5547 // FIXME: handle dependent contexts 5548 if (!DC) return DeclPtrTy(); 5549 5550 LookupQualifiedName(Previous, DC); 5551 5552 // If searching in that context implicitly found a declaration in 5553 // a different context, treat it like it wasn't found at all. 5554 // TODO: better diagnostics for this case. Suggesting the right 5555 // qualified scope would be nice... 5556 // FIXME: getRepresentativeDecl() is not right here at all 5557 if (Previous.empty() || 5558 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5559 D.setInvalidType(); 5560 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5561 return DeclPtrTy(); 5562 } 5563 5564 // C++ [class.friend]p1: A friend of a class is a function or 5565 // class that is not a member of the class . . . 5566 if (DC->Equals(CurContext)) 5567 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5568 5569 // Otherwise walk out to the nearest namespace scope looking for matches. 5570 } else { 5571 // TODO: handle local class contexts. 5572 5573 DC = CurContext; 5574 while (true) { 5575 // Skip class contexts. If someone can cite chapter and verse 5576 // for this behavior, that would be nice --- it's what GCC and 5577 // EDG do, and it seems like a reasonable intent, but the spec 5578 // really only says that checks for unqualified existing 5579 // declarations should stop at the nearest enclosing namespace, 5580 // not that they should only consider the nearest enclosing 5581 // namespace. 5582 while (DC->isRecord()) 5583 DC = DC->getParent(); 5584 5585 LookupQualifiedName(Previous, DC); 5586 5587 // TODO: decide what we think about using declarations. 5588 if (!Previous.empty()) 5589 break; 5590 5591 if (DC->isFileContext()) break; 5592 DC = DC->getParent(); 5593 } 5594 5595 // C++ [class.friend]p1: A friend of a class is a function or 5596 // class that is not a member of the class . . . 5597 // C++0x changes this for both friend types and functions. 5598 // Most C++ 98 compilers do seem to give an error here, so 5599 // we do, too. 5600 if (!Previous.empty() && DC->Equals(CurContext) 5601 && !getLangOptions().CPlusPlus0x) 5602 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5603 } 5604 5605 if (DC->isFileContext()) { 5606 // This implies that it has to be an operator or function. 5607 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5608 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5609 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5610 Diag(Loc, diag::err_introducing_special_friend) << 5611 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5612 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5613 return DeclPtrTy(); 5614 } 5615 } 5616 5617 bool Redeclaration = false; 5618 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5619 move(TemplateParams), 5620 IsDefinition, 5621 Redeclaration); 5622 if (!ND) return DeclPtrTy(); 5623 5624 assert(ND->getDeclContext() == DC); 5625 assert(ND->getLexicalDeclContext() == CurContext); 5626 5627 // Add the function declaration to the appropriate lookup tables, 5628 // adjusting the redeclarations list as necessary. We don't 5629 // want to do this yet if the friending class is dependent. 5630 // 5631 // Also update the scope-based lookup if the target context's 5632 // lookup context is in lexical scope. 5633 if (!CurContext->isDependentContext()) { 5634 DC = DC->getLookupContext(); 5635 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5636 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5637 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5638 } 5639 5640 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5641 D.getIdentifierLoc(), ND, 5642 DS.getFriendSpecLoc()); 5643 FrD->setAccess(AS_public); 5644 CurContext->addDecl(FrD); 5645 5646 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5647 FrD->setSpecialization(true); 5648 5649 return DeclPtrTy::make(ND); 5650} 5651 5652void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5653 AdjustDeclIfTemplate(dcl); 5654 5655 Decl *Dcl = dcl.getAs<Decl>(); 5656 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5657 if (!Fn) { 5658 Diag(DelLoc, diag::err_deleted_non_function); 5659 return; 5660 } 5661 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5662 Diag(DelLoc, diag::err_deleted_decl_not_first); 5663 Diag(Prev->getLocation(), diag::note_previous_declaration); 5664 // If the declaration wasn't the first, we delete the function anyway for 5665 // recovery. 5666 } 5667 Fn->setDeleted(); 5668} 5669 5670static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5671 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5672 ++CI) { 5673 Stmt *SubStmt = *CI; 5674 if (!SubStmt) 5675 continue; 5676 if (isa<ReturnStmt>(SubStmt)) 5677 Self.Diag(SubStmt->getSourceRange().getBegin(), 5678 diag::err_return_in_constructor_handler); 5679 if (!isa<Expr>(SubStmt)) 5680 SearchForReturnInStmt(Self, SubStmt); 5681 } 5682} 5683 5684void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5685 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5686 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5687 SearchForReturnInStmt(*this, Handler); 5688 } 5689} 5690 5691bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5692 const CXXMethodDecl *Old) { 5693 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5694 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5695 5696 if (Context.hasSameType(NewTy, OldTy) || 5697 NewTy->isDependentType() || OldTy->isDependentType()) 5698 return false; 5699 5700 // Check if the return types are covariant 5701 QualType NewClassTy, OldClassTy; 5702 5703 /// Both types must be pointers or references to classes. 5704 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5705 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5706 NewClassTy = NewPT->getPointeeType(); 5707 OldClassTy = OldPT->getPointeeType(); 5708 } 5709 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5710 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5711 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5712 NewClassTy = NewRT->getPointeeType(); 5713 OldClassTy = OldRT->getPointeeType(); 5714 } 5715 } 5716 } 5717 5718 // The return types aren't either both pointers or references to a class type. 5719 if (NewClassTy.isNull()) { 5720 Diag(New->getLocation(), 5721 diag::err_different_return_type_for_overriding_virtual_function) 5722 << New->getDeclName() << NewTy << OldTy; 5723 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5724 5725 return true; 5726 } 5727 5728 // C++ [class.virtual]p6: 5729 // If the return type of D::f differs from the return type of B::f, the 5730 // class type in the return type of D::f shall be complete at the point of 5731 // declaration of D::f or shall be the class type D. 5732 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5733 if (!RT->isBeingDefined() && 5734 RequireCompleteType(New->getLocation(), NewClassTy, 5735 PDiag(diag::err_covariant_return_incomplete) 5736 << New->getDeclName())) 5737 return true; 5738 } 5739 5740 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5741 // Check if the new class derives from the old class. 5742 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5743 Diag(New->getLocation(), 5744 diag::err_covariant_return_not_derived) 5745 << New->getDeclName() << NewTy << OldTy; 5746 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5747 return true; 5748 } 5749 5750 // Check if we the conversion from derived to base is valid. 5751 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5752 diag::err_covariant_return_inaccessible_base, 5753 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5754 // FIXME: Should this point to the return type? 5755 New->getLocation(), SourceRange(), New->getDeclName())) { 5756 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5757 return true; 5758 } 5759 } 5760 5761 // The qualifiers of the return types must be the same. 5762 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5763 Diag(New->getLocation(), 5764 diag::err_covariant_return_type_different_qualifications) 5765 << New->getDeclName() << NewTy << OldTy; 5766 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5767 return true; 5768 }; 5769 5770 5771 // The new class type must have the same or less qualifiers as the old type. 5772 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5773 Diag(New->getLocation(), 5774 diag::err_covariant_return_type_class_type_more_qualified) 5775 << New->getDeclName() << NewTy << OldTy; 5776 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5777 return true; 5778 }; 5779 5780 return false; 5781} 5782 5783bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5784 const CXXMethodDecl *Old) 5785{ 5786 if (Old->hasAttr<FinalAttr>()) { 5787 Diag(New->getLocation(), diag::err_final_function_overridden) 5788 << New->getDeclName(); 5789 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5790 return true; 5791 } 5792 5793 return false; 5794} 5795 5796/// \brief Mark the given method pure. 5797/// 5798/// \param Method the method to be marked pure. 5799/// 5800/// \param InitRange the source range that covers the "0" initializer. 5801bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5802 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5803 Method->setPure(); 5804 5805 // A class is abstract if at least one function is pure virtual. 5806 Method->getParent()->setAbstract(true); 5807 return false; 5808 } 5809 5810 if (!Method->isInvalidDecl()) 5811 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5812 << Method->getDeclName() << InitRange; 5813 return true; 5814} 5815 5816/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5817/// an initializer for the out-of-line declaration 'Dcl'. The scope 5818/// is a fresh scope pushed for just this purpose. 5819/// 5820/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5821/// static data member of class X, names should be looked up in the scope of 5822/// class X. 5823void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5824 // If there is no declaration, there was an error parsing it. 5825 Decl *D = Dcl.getAs<Decl>(); 5826 if (D == 0) return; 5827 5828 // We should only get called for declarations with scope specifiers, like: 5829 // int foo::bar; 5830 assert(D->isOutOfLine()); 5831 EnterDeclaratorContext(S, D->getDeclContext()); 5832} 5833 5834/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5835/// initializer for the out-of-line declaration 'Dcl'. 5836void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5837 // If there is no declaration, there was an error parsing it. 5838 Decl *D = Dcl.getAs<Decl>(); 5839 if (D == 0) return; 5840 5841 assert(D->isOutOfLine()); 5842 ExitDeclaratorContext(S); 5843} 5844 5845/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5846/// C++ if/switch/while/for statement. 5847/// e.g: "if (int x = f()) {...}" 5848Action::DeclResult 5849Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5850 // C++ 6.4p2: 5851 // The declarator shall not specify a function or an array. 5852 // The type-specifier-seq shall not contain typedef and shall not declare a 5853 // new class or enumeration. 5854 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5855 "Parser allowed 'typedef' as storage class of condition decl."); 5856 5857 TypeSourceInfo *TInfo = 0; 5858 TagDecl *OwnedTag = 0; 5859 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5860 5861 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5862 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5863 // would be created and CXXConditionDeclExpr wants a VarDecl. 5864 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5865 << D.getSourceRange(); 5866 return DeclResult(); 5867 } else if (OwnedTag && OwnedTag->isDefinition()) { 5868 // The type-specifier-seq shall not declare a new class or enumeration. 5869 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5870 } 5871 5872 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5873 if (!Dcl) 5874 return DeclResult(); 5875 5876 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5877 VD->setDeclaredInCondition(true); 5878 return Dcl; 5879} 5880 5881static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5882 // Ignore dependent types. 5883 if (MD->isDependentContext()) 5884 return false; 5885 5886 // Ignore declarations that are not definitions. 5887 if (!MD->isThisDeclarationADefinition()) 5888 return false; 5889 5890 CXXRecordDecl *RD = MD->getParent(); 5891 5892 // Ignore classes without a vtable. 5893 if (!RD->isDynamicClass()) 5894 return false; 5895 5896 switch (MD->getParent()->getTemplateSpecializationKind()) { 5897 case TSK_Undeclared: 5898 case TSK_ExplicitSpecialization: 5899 // Classes that aren't instantiations of templates don't need their 5900 // virtual methods marked until we see the definition of the key 5901 // function. 5902 break; 5903 5904 case TSK_ImplicitInstantiation: 5905 // This is a constructor of a class template; mark all of the virtual 5906 // members as referenced to ensure that they get instantiatied. 5907 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5908 return true; 5909 break; 5910 5911 case TSK_ExplicitInstantiationDeclaration: 5912 return false; 5913 5914 case TSK_ExplicitInstantiationDefinition: 5915 // This is method of a explicit instantiation; mark all of the virtual 5916 // members as referenced to ensure that they get instantiatied. 5917 return true; 5918 } 5919 5920 // Consider only out-of-line definitions of member functions. When we see 5921 // an inline definition, it's too early to compute the key function. 5922 if (!MD->isOutOfLine()) 5923 return false; 5924 5925 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5926 5927 // If there is no key function, we will need a copy of the vtable. 5928 if (!KeyFunction) 5929 return true; 5930 5931 // If this is the key function, we need to mark virtual members. 5932 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5933 return true; 5934 5935 return false; 5936} 5937 5938void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5939 CXXMethodDecl *MD) { 5940 CXXRecordDecl *RD = MD->getParent(); 5941 5942 // We will need to mark all of the virtual members as referenced to build the 5943 // vtable. 5944 if (!needsVtable(MD, Context)) 5945 return; 5946 5947 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5948 if (kind == TSK_ImplicitInstantiation) 5949 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5950 else 5951 MarkVirtualMembersReferenced(Loc, RD); 5952} 5953 5954bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5955 if (ClassesWithUnmarkedVirtualMembers.empty()) 5956 return false; 5957 5958 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5959 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5960 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5961 ClassesWithUnmarkedVirtualMembers.pop_back(); 5962 MarkVirtualMembersReferenced(Loc, RD); 5963 } 5964 5965 return true; 5966} 5967 5968void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 5969 const CXXRecordDecl *RD) { 5970 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5971 e = RD->method_end(); i != e; ++i) { 5972 CXXMethodDecl *MD = *i; 5973 5974 // C++ [basic.def.odr]p2: 5975 // [...] A virtual member function is used if it is not pure. [...] 5976 if (MD->isVirtual() && !MD->isPure()) 5977 MarkDeclarationReferenced(Loc, MD); 5978 } 5979 5980 // Only classes that have virtual bases need a VTT. 5981 if (RD->getNumVBases() == 0) 5982 return; 5983 5984 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 5985 e = RD->bases_end(); i != e; ++i) { 5986 const CXXRecordDecl *Base = 5987 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 5988 if (i->isVirtual()) 5989 continue; 5990 if (Base->getNumVBases() == 0) 5991 continue; 5992 MarkVirtualMembersReferenced(Loc, Base); 5993 } 5994} 5995