SemaDeclCXX.cpp revision 77e8e18b02560741e07052f35f29894f0a787091
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/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 626 if (KnownBaseTypes[NewBaseType]) { 627 // C++ [class.mi]p3: 628 // A class shall not be specified as a direct base class of a 629 // derived class more than once. 630 Diag(Bases[idx]->getSourceRange().getBegin(), 631 diag::err_duplicate_base_class) 632 << KnownBaseTypes[NewBaseType]->getType() 633 << Bases[idx]->getSourceRange(); 634 635 // Delete the duplicate base class specifier; we're going to 636 // overwrite its pointer later. 637 Context.Deallocate(Bases[idx]); 638 639 Invalid = true; 640 } else { 641 // Okay, add this new base class. 642 KnownBaseTypes[NewBaseType] = Bases[idx]; 643 Bases[NumGoodBases++] = Bases[idx]; 644 } 645 } 646 647 // Attach the remaining base class specifiers to the derived class. 648 Class->setBases(Bases, NumGoodBases); 649 650 // Delete the remaining (good) base class specifiers, since their 651 // data has been copied into the CXXRecordDecl. 652 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 653 Context.Deallocate(Bases[idx]); 654 655 return Invalid; 656} 657 658/// ActOnBaseSpecifiers - Attach the given base specifiers to the 659/// class, after checking whether there are any duplicate base 660/// classes. 661void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 662 unsigned NumBases) { 663 if (!ClassDecl || !Bases || !NumBases) 664 return; 665 666 AdjustDeclIfTemplate(ClassDecl); 667 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 668 (CXXBaseSpecifier**)(Bases), NumBases); 669} 670 671static CXXRecordDecl *GetClassForType(QualType T) { 672 if (const RecordType *RT = T->getAs<RecordType>()) 673 return cast<CXXRecordDecl>(RT->getDecl()); 674 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 675 return ICT->getDecl(); 676 else 677 return 0; 678} 679 680/// \brief Determine whether the type \p Derived is a C++ class that is 681/// derived from the type \p Base. 682bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 683 if (!getLangOptions().CPlusPlus) 684 return false; 685 686 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 687 if (!DerivedRD) 688 return false; 689 690 CXXRecordDecl *BaseRD = GetClassForType(Base); 691 if (!BaseRD) 692 return false; 693 694 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 695 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 696} 697 698/// \brief Determine whether the type \p Derived is a C++ class that is 699/// derived from the type \p Base. 700bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 701 if (!getLangOptions().CPlusPlus) 702 return false; 703 704 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 705 if (!DerivedRD) 706 return false; 707 708 CXXRecordDecl *BaseRD = GetClassForType(Base); 709 if (!BaseRD) 710 return false; 711 712 return DerivedRD->isDerivedFrom(BaseRD, Paths); 713} 714 715void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 716 CXXBaseSpecifierArray &BasePathArray) { 717 assert(BasePathArray.empty() && "Base path array must be empty!"); 718 assert(Paths.isRecordingPaths() && "Must record paths!"); 719 720 const CXXBasePath &Path = Paths.front(); 721 722 // We first go backward and check if we have a virtual base. 723 // FIXME: It would be better if CXXBasePath had the base specifier for 724 // the nearest virtual base. 725 unsigned Start = 0; 726 for (unsigned I = Path.size(); I != 0; --I) { 727 if (Path[I - 1].Base->isVirtual()) { 728 Start = I - 1; 729 break; 730 } 731 } 732 733 // Now add all bases. 734 for (unsigned I = Start, E = Path.size(); I != E; ++I) 735 BasePathArray.push_back(Path[I].Base); 736} 737 738/// \brief Determine whether the given base path includes a virtual 739/// base class. 740bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 741 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 742 BEnd = BasePath.end(); 743 B != BEnd; ++B) 744 if ((*B)->isVirtual()) 745 return true; 746 747 return false; 748} 749 750/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 751/// conversion (where Derived and Base are class types) is 752/// well-formed, meaning that the conversion is unambiguous (and 753/// that all of the base classes are accessible). Returns true 754/// and emits a diagnostic if the code is ill-formed, returns false 755/// otherwise. Loc is the location where this routine should point to 756/// if there is an error, and Range is the source range to highlight 757/// if there is an error. 758bool 759Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 760 unsigned InaccessibleBaseID, 761 unsigned AmbigiousBaseConvID, 762 SourceLocation Loc, SourceRange Range, 763 DeclarationName Name, 764 CXXBaseSpecifierArray *BasePath) { 765 // First, determine whether the path from Derived to Base is 766 // ambiguous. This is slightly more expensive than checking whether 767 // the Derived to Base conversion exists, because here we need to 768 // explore multiple paths to determine if there is an ambiguity. 769 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 770 /*DetectVirtual=*/false); 771 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 772 assert(DerivationOkay && 773 "Can only be used with a derived-to-base conversion"); 774 (void)DerivationOkay; 775 776 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 777 if (InaccessibleBaseID) { 778 // Check that the base class can be accessed. 779 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 780 InaccessibleBaseID)) { 781 case AR_inaccessible: 782 return true; 783 case AR_accessible: 784 case AR_dependent: 785 case AR_delayed: 786 break; 787 } 788 } 789 790 // Build a base path if necessary. 791 if (BasePath) 792 BuildBasePathArray(Paths, *BasePath); 793 return false; 794 } 795 796 // We know that the derived-to-base conversion is ambiguous, and 797 // we're going to produce a diagnostic. Perform the derived-to-base 798 // search just one more time to compute all of the possible paths so 799 // that we can print them out. This is more expensive than any of 800 // the previous derived-to-base checks we've done, but at this point 801 // performance isn't as much of an issue. 802 Paths.clear(); 803 Paths.setRecordingPaths(true); 804 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 805 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 806 (void)StillOkay; 807 808 // Build up a textual representation of the ambiguous paths, e.g., 809 // D -> B -> A, that will be used to illustrate the ambiguous 810 // conversions in the diagnostic. We only print one of the paths 811 // to each base class subobject. 812 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 813 814 Diag(Loc, AmbigiousBaseConvID) 815 << Derived << Base << PathDisplayStr << Range << Name; 816 return true; 817} 818 819bool 820Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 821 SourceLocation Loc, SourceRange Range, 822 CXXBaseSpecifierArray *BasePath, 823 bool IgnoreAccess) { 824 return CheckDerivedToBaseConversion(Derived, Base, 825 IgnoreAccess ? 0 826 : diag::err_upcast_to_inaccessible_base, 827 diag::err_ambiguous_derived_to_base_conv, 828 Loc, Range, DeclarationName(), 829 BasePath); 830} 831 832 833/// @brief Builds a string representing ambiguous paths from a 834/// specific derived class to different subobjects of the same base 835/// class. 836/// 837/// This function builds a string that can be used in error messages 838/// to show the different paths that one can take through the 839/// inheritance hierarchy to go from the derived class to different 840/// subobjects of a base class. The result looks something like this: 841/// @code 842/// struct D -> struct B -> struct A 843/// struct D -> struct C -> struct A 844/// @endcode 845std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 846 std::string PathDisplayStr; 847 std::set<unsigned> DisplayedPaths; 848 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 849 Path != Paths.end(); ++Path) { 850 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 851 // We haven't displayed a path to this particular base 852 // class subobject yet. 853 PathDisplayStr += "\n "; 854 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 855 for (CXXBasePath::const_iterator Element = Path->begin(); 856 Element != Path->end(); ++Element) 857 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 858 } 859 } 860 861 return PathDisplayStr; 862} 863 864//===----------------------------------------------------------------------===// 865// C++ class member Handling 866//===----------------------------------------------------------------------===// 867 868/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 869/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 870/// bitfield width if there is one and 'InitExpr' specifies the initializer if 871/// any. 872Sema::DeclPtrTy 873Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 874 MultiTemplateParamsArg TemplateParameterLists, 875 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 876 bool Deleted) { 877 const DeclSpec &DS = D.getDeclSpec(); 878 DeclarationName Name = GetNameForDeclarator(D); 879 Expr *BitWidth = static_cast<Expr*>(BW); 880 Expr *Init = static_cast<Expr*>(InitExpr); 881 SourceLocation Loc = D.getIdentifierLoc(); 882 883 bool isFunc = D.isFunctionDeclarator(); 884 885 assert(!DS.isFriendSpecified()); 886 887 // C++ 9.2p6: A member shall not be declared to have automatic storage 888 // duration (auto, register) or with the extern storage-class-specifier. 889 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 890 // data members and cannot be applied to names declared const or static, 891 // and cannot be applied to reference members. 892 switch (DS.getStorageClassSpec()) { 893 case DeclSpec::SCS_unspecified: 894 case DeclSpec::SCS_typedef: 895 case DeclSpec::SCS_static: 896 // FALL THROUGH. 897 break; 898 case DeclSpec::SCS_mutable: 899 if (isFunc) { 900 if (DS.getStorageClassSpecLoc().isValid()) 901 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 902 else 903 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 904 905 // FIXME: It would be nicer if the keyword was ignored only for this 906 // declarator. Otherwise we could get follow-up errors. 907 D.getMutableDeclSpec().ClearStorageClassSpecs(); 908 } else { 909 QualType T = GetTypeForDeclarator(D, S); 910 diag::kind err = static_cast<diag::kind>(0); 911 if (T->isReferenceType()) 912 err = diag::err_mutable_reference; 913 else if (T.isConstQualified()) 914 err = diag::err_mutable_const; 915 if (err != 0) { 916 if (DS.getStorageClassSpecLoc().isValid()) 917 Diag(DS.getStorageClassSpecLoc(), err); 918 else 919 Diag(DS.getThreadSpecLoc(), err); 920 // FIXME: It would be nicer if the keyword was ignored only for this 921 // declarator. Otherwise we could get follow-up errors. 922 D.getMutableDeclSpec().ClearStorageClassSpecs(); 923 } 924 } 925 break; 926 default: 927 if (DS.getStorageClassSpecLoc().isValid()) 928 Diag(DS.getStorageClassSpecLoc(), 929 diag::err_storageclass_invalid_for_member); 930 else 931 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 932 D.getMutableDeclSpec().ClearStorageClassSpecs(); 933 } 934 935 if (!isFunc && 936 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 937 D.getNumTypeObjects() == 0) { 938 // Check also for this case: 939 // 940 // typedef int f(); 941 // f a; 942 // 943 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 944 isFunc = TDType->isFunctionType(); 945 } 946 947 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 948 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 949 !isFunc); 950 951 Decl *Member; 952 if (isInstField) { 953 // FIXME: Check for template parameters! 954 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 955 AS); 956 assert(Member && "HandleField never returns null"); 957 } else { 958 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 959 .getAs<Decl>(); 960 if (!Member) { 961 if (BitWidth) DeleteExpr(BitWidth); 962 return DeclPtrTy(); 963 } 964 965 // Non-instance-fields can't have a bitfield. 966 if (BitWidth) { 967 if (Member->isInvalidDecl()) { 968 // don't emit another diagnostic. 969 } else if (isa<VarDecl>(Member)) { 970 // C++ 9.6p3: A bit-field shall not be a static member. 971 // "static member 'A' cannot be a bit-field" 972 Diag(Loc, diag::err_static_not_bitfield) 973 << Name << BitWidth->getSourceRange(); 974 } else if (isa<TypedefDecl>(Member)) { 975 // "typedef member 'x' cannot be a bit-field" 976 Diag(Loc, diag::err_typedef_not_bitfield) 977 << Name << BitWidth->getSourceRange(); 978 } else { 979 // A function typedef ("typedef int f(); f a;"). 980 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 981 Diag(Loc, diag::err_not_integral_type_bitfield) 982 << Name << cast<ValueDecl>(Member)->getType() 983 << BitWidth->getSourceRange(); 984 } 985 986 DeleteExpr(BitWidth); 987 BitWidth = 0; 988 Member->setInvalidDecl(); 989 } 990 991 Member->setAccess(AS); 992 993 // If we have declared a member function template, set the access of the 994 // templated declaration as well. 995 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 996 FunTmpl->getTemplatedDecl()->setAccess(AS); 997 } 998 999 assert((Name || isInstField) && "No identifier for non-field ?"); 1000 1001 if (Init) 1002 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1003 if (Deleted) // FIXME: Source location is not very good. 1004 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1005 1006 if (isInstField) { 1007 FieldCollector->Add(cast<FieldDecl>(Member)); 1008 return DeclPtrTy(); 1009 } 1010 return DeclPtrTy::make(Member); 1011} 1012 1013/// \brief Find the direct and/or virtual base specifiers that 1014/// correspond to the given base type, for use in base initialization 1015/// within a constructor. 1016static bool FindBaseInitializer(Sema &SemaRef, 1017 CXXRecordDecl *ClassDecl, 1018 QualType BaseType, 1019 const CXXBaseSpecifier *&DirectBaseSpec, 1020 const CXXBaseSpecifier *&VirtualBaseSpec) { 1021 // First, check for a direct base class. 1022 DirectBaseSpec = 0; 1023 for (CXXRecordDecl::base_class_const_iterator Base 1024 = ClassDecl->bases_begin(); 1025 Base != ClassDecl->bases_end(); ++Base) { 1026 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1027 // We found a direct base of this type. That's what we're 1028 // initializing. 1029 DirectBaseSpec = &*Base; 1030 break; 1031 } 1032 } 1033 1034 // Check for a virtual base class. 1035 // FIXME: We might be able to short-circuit this if we know in advance that 1036 // there are no virtual bases. 1037 VirtualBaseSpec = 0; 1038 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1039 // We haven't found a base yet; search the class hierarchy for a 1040 // virtual base class. 1041 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1042 /*DetectVirtual=*/false); 1043 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1044 BaseType, Paths)) { 1045 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1046 Path != Paths.end(); ++Path) { 1047 if (Path->back().Base->isVirtual()) { 1048 VirtualBaseSpec = Path->back().Base; 1049 break; 1050 } 1051 } 1052 } 1053 } 1054 1055 return DirectBaseSpec || VirtualBaseSpec; 1056} 1057 1058/// ActOnMemInitializer - Handle a C++ member initializer. 1059Sema::MemInitResult 1060Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1061 Scope *S, 1062 CXXScopeSpec &SS, 1063 IdentifierInfo *MemberOrBase, 1064 TypeTy *TemplateTypeTy, 1065 SourceLocation IdLoc, 1066 SourceLocation LParenLoc, 1067 ExprTy **Args, unsigned NumArgs, 1068 SourceLocation *CommaLocs, 1069 SourceLocation RParenLoc) { 1070 if (!ConstructorD) 1071 return true; 1072 1073 AdjustDeclIfTemplate(ConstructorD); 1074 1075 CXXConstructorDecl *Constructor 1076 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1077 if (!Constructor) { 1078 // The user wrote a constructor initializer on a function that is 1079 // not a C++ constructor. Ignore the error for now, because we may 1080 // have more member initializers coming; we'll diagnose it just 1081 // once in ActOnMemInitializers. 1082 return true; 1083 } 1084 1085 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1086 1087 // C++ [class.base.init]p2: 1088 // Names in a mem-initializer-id are looked up in the scope of the 1089 // constructor’s class and, if not found in that scope, are looked 1090 // up in the scope containing the constructor’s 1091 // definition. [Note: if the constructor’s class contains a member 1092 // with the same name as a direct or virtual base class of the 1093 // class, a mem-initializer-id naming the member or base class and 1094 // composed of a single identifier refers to the class member. A 1095 // mem-initializer-id for the hidden base class may be specified 1096 // using a qualified name. ] 1097 if (!SS.getScopeRep() && !TemplateTypeTy) { 1098 // Look for a member, first. 1099 FieldDecl *Member = 0; 1100 DeclContext::lookup_result Result 1101 = ClassDecl->lookup(MemberOrBase); 1102 if (Result.first != Result.second) 1103 Member = dyn_cast<FieldDecl>(*Result.first); 1104 1105 // FIXME: Handle members of an anonymous union. 1106 1107 if (Member) 1108 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1109 LParenLoc, RParenLoc); 1110 } 1111 // It didn't name a member, so see if it names a class. 1112 QualType BaseType; 1113 TypeSourceInfo *TInfo = 0; 1114 1115 if (TemplateTypeTy) { 1116 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1117 } else { 1118 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1119 LookupParsedName(R, S, &SS); 1120 1121 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1122 if (!TyD) { 1123 if (R.isAmbiguous()) return true; 1124 1125 // We don't want access-control diagnostics here. 1126 R.suppressDiagnostics(); 1127 1128 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1129 bool NotUnknownSpecialization = false; 1130 DeclContext *DC = computeDeclContext(SS, false); 1131 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1132 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1133 1134 if (!NotUnknownSpecialization) { 1135 // When the scope specifier can refer to a member of an unknown 1136 // specialization, we take it as a type name. 1137 BaseType = CheckTypenameType(ETK_None, 1138 (NestedNameSpecifier *)SS.getScopeRep(), 1139 *MemberOrBase, SourceLocation(), 1140 SS.getRange(), IdLoc); 1141 if (BaseType.isNull()) 1142 return true; 1143 1144 R.clear(); 1145 } 1146 } 1147 1148 // If no results were found, try to correct typos. 1149 if (R.empty() && BaseType.isNull() && 1150 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1151 R.isSingleResult()) { 1152 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1153 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1154 // We have found a non-static data member with a similar 1155 // name to what was typed; complain and initialize that 1156 // member. 1157 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1158 << MemberOrBase << true << R.getLookupName() 1159 << FixItHint::CreateReplacement(R.getNameLoc(), 1160 R.getLookupName().getAsString()); 1161 Diag(Member->getLocation(), diag::note_previous_decl) 1162 << Member->getDeclName(); 1163 1164 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1165 LParenLoc, RParenLoc); 1166 } 1167 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1168 const CXXBaseSpecifier *DirectBaseSpec; 1169 const CXXBaseSpecifier *VirtualBaseSpec; 1170 if (FindBaseInitializer(*this, ClassDecl, 1171 Context.getTypeDeclType(Type), 1172 DirectBaseSpec, VirtualBaseSpec)) { 1173 // We have found a direct or virtual base class with a 1174 // similar name to what was typed; complain and initialize 1175 // that base class. 1176 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1177 << MemberOrBase << false << R.getLookupName() 1178 << FixItHint::CreateReplacement(R.getNameLoc(), 1179 R.getLookupName().getAsString()); 1180 1181 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1182 : VirtualBaseSpec; 1183 Diag(BaseSpec->getSourceRange().getBegin(), 1184 diag::note_base_class_specified_here) 1185 << BaseSpec->getType() 1186 << BaseSpec->getSourceRange(); 1187 1188 TyD = Type; 1189 } 1190 } 1191 } 1192 1193 if (!TyD && BaseType.isNull()) { 1194 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1195 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1196 return true; 1197 } 1198 } 1199 1200 if (BaseType.isNull()) { 1201 BaseType = Context.getTypeDeclType(TyD); 1202 if (SS.isSet()) { 1203 NestedNameSpecifier *Qualifier = 1204 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1205 1206 // FIXME: preserve source range information 1207 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1208 } 1209 } 1210 } 1211 1212 if (!TInfo) 1213 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1214 1215 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1216 LParenLoc, RParenLoc, ClassDecl); 1217} 1218 1219/// Checks an initializer expression for use of uninitialized fields, such as 1220/// containing the field that is being initialized. Returns true if there is an 1221/// uninitialized field was used an updates the SourceLocation parameter; false 1222/// otherwise. 1223static bool InitExprContainsUninitializedFields(const Stmt* S, 1224 const FieldDecl* LhsField, 1225 SourceLocation* L) { 1226 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1227 if (ME) { 1228 const NamedDecl* RhsField = ME->getMemberDecl(); 1229 if (RhsField == LhsField) { 1230 // Initializing a field with itself. Throw a warning. 1231 // But wait; there are exceptions! 1232 // Exception #1: The field may not belong to this record. 1233 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1234 const Expr* base = ME->getBase(); 1235 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1236 // Even though the field matches, it does not belong to this record. 1237 return false; 1238 } 1239 // None of the exceptions triggered; return true to indicate an 1240 // uninitialized field was used. 1241 *L = ME->getMemberLoc(); 1242 return true; 1243 } 1244 } 1245 bool found = false; 1246 for (Stmt::const_child_iterator it = S->child_begin(); 1247 it != S->child_end() && found == false; 1248 ++it) { 1249 if (isa<CallExpr>(S)) { 1250 // Do not descend into function calls or constructors, as the use 1251 // of an uninitialized field may be valid. One would have to inspect 1252 // the contents of the function/ctor to determine if it is safe or not. 1253 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1254 // may be safe, depending on what the function/ctor does. 1255 continue; 1256 } 1257 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1258 } 1259 return found; 1260} 1261 1262Sema::MemInitResult 1263Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1264 unsigned NumArgs, SourceLocation IdLoc, 1265 SourceLocation LParenLoc, 1266 SourceLocation RParenLoc) { 1267 // Diagnose value-uses of fields to initialize themselves, e.g. 1268 // foo(foo) 1269 // where foo is not also a parameter to the constructor. 1270 // TODO: implement -Wuninitialized and fold this into that framework. 1271 for (unsigned i = 0; i < NumArgs; ++i) { 1272 SourceLocation L; 1273 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1274 // FIXME: Return true in the case when other fields are used before being 1275 // uninitialized. For example, let this field be the i'th field. When 1276 // initializing the i'th field, throw a warning if any of the >= i'th 1277 // fields are used, as they are not yet initialized. 1278 // Right now we are only handling the case where the i'th field uses 1279 // itself in its initializer. 1280 Diag(L, diag::warn_field_is_uninit); 1281 } 1282 } 1283 1284 bool HasDependentArg = false; 1285 for (unsigned i = 0; i < NumArgs; i++) 1286 HasDependentArg |= Args[i]->isTypeDependent(); 1287 1288 QualType FieldType = Member->getType(); 1289 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1290 FieldType = Array->getElementType(); 1291 if (FieldType->isDependentType() || HasDependentArg) { 1292 // Can't check initialization for a member of dependent type or when 1293 // any of the arguments are type-dependent expressions. 1294 OwningExprResult Init 1295 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1296 RParenLoc)); 1297 1298 // Erase any temporaries within this evaluation context; we're not 1299 // going to track them in the AST, since we'll be rebuilding the 1300 // ASTs during template instantiation. 1301 ExprTemporaries.erase( 1302 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1303 ExprTemporaries.end()); 1304 1305 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1306 LParenLoc, 1307 Init.takeAs<Expr>(), 1308 RParenLoc); 1309 1310 } 1311 1312 if (Member->isInvalidDecl()) 1313 return true; 1314 1315 // Initialize the member. 1316 InitializedEntity MemberEntity = 1317 InitializedEntity::InitializeMember(Member, 0); 1318 InitializationKind Kind = 1319 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1320 1321 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1322 1323 OwningExprResult MemberInit = 1324 InitSeq.Perform(*this, MemberEntity, Kind, 1325 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1326 if (MemberInit.isInvalid()) 1327 return true; 1328 1329 // C++0x [class.base.init]p7: 1330 // The initialization of each base and member constitutes a 1331 // full-expression. 1332 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1333 if (MemberInit.isInvalid()) 1334 return true; 1335 1336 // If we are in a dependent context, template instantiation will 1337 // perform this type-checking again. Just save the arguments that we 1338 // received in a ParenListExpr. 1339 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1340 // of the information that we have about the member 1341 // initializer. However, deconstructing the ASTs is a dicey process, 1342 // and this approach is far more likely to get the corner cases right. 1343 if (CurContext->isDependentContext()) { 1344 // Bump the reference count of all of the arguments. 1345 for (unsigned I = 0; I != NumArgs; ++I) 1346 Args[I]->Retain(); 1347 1348 OwningExprResult Init 1349 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1350 RParenLoc)); 1351 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1352 LParenLoc, 1353 Init.takeAs<Expr>(), 1354 RParenLoc); 1355 } 1356 1357 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1358 LParenLoc, 1359 MemberInit.takeAs<Expr>(), 1360 RParenLoc); 1361} 1362 1363Sema::MemInitResult 1364Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1365 Expr **Args, unsigned NumArgs, 1366 SourceLocation LParenLoc, SourceLocation RParenLoc, 1367 CXXRecordDecl *ClassDecl) { 1368 bool HasDependentArg = false; 1369 for (unsigned i = 0; i < NumArgs; i++) 1370 HasDependentArg |= Args[i]->isTypeDependent(); 1371 1372 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1373 if (BaseType->isDependentType() || HasDependentArg) { 1374 // Can't check initialization for a base of dependent type or when 1375 // any of the arguments are type-dependent expressions. 1376 OwningExprResult BaseInit 1377 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1378 RParenLoc)); 1379 1380 // Erase any temporaries within this evaluation context; we're not 1381 // going to track them in the AST, since we'll be rebuilding the 1382 // ASTs during template instantiation. 1383 ExprTemporaries.erase( 1384 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1385 ExprTemporaries.end()); 1386 1387 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1388 /*IsVirtual=*/false, 1389 LParenLoc, 1390 BaseInit.takeAs<Expr>(), 1391 RParenLoc); 1392 } 1393 1394 if (!BaseType->isRecordType()) 1395 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1396 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1397 1398 // C++ [class.base.init]p2: 1399 // [...] Unless the mem-initializer-id names a nonstatic data 1400 // member of the constructor’s class or a direct or virtual base 1401 // of that class, the mem-initializer is ill-formed. A 1402 // mem-initializer-list can initialize a base class using any 1403 // name that denotes that base class type. 1404 1405 // Check for direct and virtual base classes. 1406 const CXXBaseSpecifier *DirectBaseSpec = 0; 1407 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1408 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1409 VirtualBaseSpec); 1410 1411 // C++ [base.class.init]p2: 1412 // If a mem-initializer-id is ambiguous because it designates both 1413 // a direct non-virtual base class and an inherited virtual base 1414 // class, the mem-initializer is ill-formed. 1415 if (DirectBaseSpec && VirtualBaseSpec) 1416 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1417 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1418 // C++ [base.class.init]p2: 1419 // Unless the mem-initializer-id names a nonstatic data membeer of the 1420 // constructor's class ot a direst or virtual base of that class, the 1421 // mem-initializer is ill-formed. 1422 if (!DirectBaseSpec && !VirtualBaseSpec) 1423 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1424 << BaseType << Context.getTypeDeclType(ClassDecl) 1425 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1426 1427 CXXBaseSpecifier *BaseSpec 1428 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1429 if (!BaseSpec) 1430 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1431 1432 // Initialize the base. 1433 InitializedEntity BaseEntity = 1434 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1435 InitializationKind Kind = 1436 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1437 1438 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1439 1440 OwningExprResult BaseInit = 1441 InitSeq.Perform(*this, BaseEntity, Kind, 1442 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1443 if (BaseInit.isInvalid()) 1444 return true; 1445 1446 // C++0x [class.base.init]p7: 1447 // The initialization of each base and member constitutes a 1448 // full-expression. 1449 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1450 if (BaseInit.isInvalid()) 1451 return true; 1452 1453 // If we are in a dependent context, template instantiation will 1454 // perform this type-checking again. Just save the arguments that we 1455 // received in a ParenListExpr. 1456 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1457 // of the information that we have about the base 1458 // initializer. However, deconstructing the ASTs is a dicey process, 1459 // and this approach is far more likely to get the corner cases right. 1460 if (CurContext->isDependentContext()) { 1461 // Bump the reference count of all of the arguments. 1462 for (unsigned I = 0; I != NumArgs; ++I) 1463 Args[I]->Retain(); 1464 1465 OwningExprResult Init 1466 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1467 RParenLoc)); 1468 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1469 BaseSpec->isVirtual(), 1470 LParenLoc, 1471 Init.takeAs<Expr>(), 1472 RParenLoc); 1473 } 1474 1475 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1476 BaseSpec->isVirtual(), 1477 LParenLoc, 1478 BaseInit.takeAs<Expr>(), 1479 RParenLoc); 1480} 1481 1482/// ImplicitInitializerKind - How an implicit base or member initializer should 1483/// initialize its base or member. 1484enum ImplicitInitializerKind { 1485 IIK_Default, 1486 IIK_Copy, 1487 IIK_Move 1488}; 1489 1490static bool 1491BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1492 ImplicitInitializerKind ImplicitInitKind, 1493 CXXBaseSpecifier *BaseSpec, 1494 bool IsInheritedVirtualBase, 1495 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1496 InitializedEntity InitEntity 1497 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1498 IsInheritedVirtualBase); 1499 1500 Sema::OwningExprResult BaseInit(SemaRef); 1501 1502 switch (ImplicitInitKind) { 1503 case IIK_Default: { 1504 InitializationKind InitKind 1505 = InitializationKind::CreateDefault(Constructor->getLocation()); 1506 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1507 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1508 Sema::MultiExprArg(SemaRef, 0, 0)); 1509 break; 1510 } 1511 1512 case IIK_Copy: { 1513 ParmVarDecl *Param = Constructor->getParamDecl(0); 1514 QualType ParamType = Param->getType().getNonReferenceType(); 1515 1516 Expr *CopyCtorArg = 1517 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1518 Constructor->getLocation(), ParamType, 0); 1519 1520 // Cast to the base class to avoid ambiguities. 1521 QualType ArgTy = 1522 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1523 ParamType.getQualifiers()); 1524 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1525 CastExpr::CK_UncheckedDerivedToBase, 1526 /*isLvalue=*/true, 1527 CXXBaseSpecifierArray(BaseSpec)); 1528 1529 InitializationKind InitKind 1530 = InitializationKind::CreateDirect(Constructor->getLocation(), 1531 SourceLocation(), SourceLocation()); 1532 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1533 &CopyCtorArg, 1); 1534 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1535 Sema::MultiExprArg(SemaRef, 1536 (void**)&CopyCtorArg, 1)); 1537 break; 1538 } 1539 1540 case IIK_Move: 1541 assert(false && "Unhandled initializer kind!"); 1542 } 1543 1544 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1545 if (BaseInit.isInvalid()) 1546 return true; 1547 1548 CXXBaseInit = 1549 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1550 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1551 SourceLocation()), 1552 BaseSpec->isVirtual(), 1553 SourceLocation(), 1554 BaseInit.takeAs<Expr>(), 1555 SourceLocation()); 1556 1557 return false; 1558} 1559 1560static bool 1561BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1562 ImplicitInitializerKind ImplicitInitKind, 1563 FieldDecl *Field, 1564 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1565 if (ImplicitInitKind == IIK_Copy) { 1566 SourceLocation Loc = Constructor->getLocation(); 1567 ParmVarDecl *Param = Constructor->getParamDecl(0); 1568 QualType ParamType = Param->getType().getNonReferenceType(); 1569 1570 Expr *MemberExprBase = 1571 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1572 Loc, ParamType, 0); 1573 1574 // Build a reference to this field within the parameter. 1575 CXXScopeSpec SS; 1576 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1577 Sema::LookupMemberName); 1578 MemberLookup.addDecl(Field, AS_public); 1579 MemberLookup.resolveKind(); 1580 Sema::OwningExprResult CopyCtorArg 1581 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1582 ParamType, Loc, 1583 /*IsArrow=*/false, 1584 SS, 1585 /*FirstQualifierInScope=*/0, 1586 MemberLookup, 1587 /*TemplateArgs=*/0); 1588 if (CopyCtorArg.isInvalid()) 1589 return true; 1590 1591 // When the field we are copying is an array, create index variables for 1592 // each dimension of the array. We use these index variables to subscript 1593 // the source array, and other clients (e.g., CodeGen) will perform the 1594 // necessary iteration with these index variables. 1595 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1596 QualType BaseType = Field->getType(); 1597 QualType SizeType = SemaRef.Context.getSizeType(); 1598 while (const ConstantArrayType *Array 1599 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1600 // Create the iteration variable for this array index. 1601 IdentifierInfo *IterationVarName = 0; 1602 { 1603 llvm::SmallString<8> Str; 1604 llvm::raw_svector_ostream OS(Str); 1605 OS << "__i" << IndexVariables.size(); 1606 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1607 } 1608 VarDecl *IterationVar 1609 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1610 IterationVarName, SizeType, 1611 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1612 VarDecl::None, VarDecl::None); 1613 IndexVariables.push_back(IterationVar); 1614 1615 // Create a reference to the iteration variable. 1616 Sema::OwningExprResult IterationVarRef 1617 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1618 assert(!IterationVarRef.isInvalid() && 1619 "Reference to invented variable cannot fail!"); 1620 1621 // Subscript the array with this iteration variable. 1622 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1623 Loc, 1624 move(IterationVarRef), 1625 Loc); 1626 if (CopyCtorArg.isInvalid()) 1627 return true; 1628 1629 BaseType = Array->getElementType(); 1630 } 1631 1632 // Construct the entity that we will be initializing. For an array, this 1633 // will be first element in the array, which may require several levels 1634 // of array-subscript entities. 1635 llvm::SmallVector<InitializedEntity, 4> Entities; 1636 Entities.reserve(1 + IndexVariables.size()); 1637 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1638 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1639 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1640 0, 1641 Entities.back())); 1642 1643 // Direct-initialize to use the copy constructor. 1644 InitializationKind InitKind = 1645 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1646 1647 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1648 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1649 &CopyCtorArgE, 1); 1650 1651 Sema::OwningExprResult MemberInit 1652 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1653 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1654 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1655 if (MemberInit.isInvalid()) 1656 return true; 1657 1658 CXXMemberInit 1659 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1660 MemberInit.takeAs<Expr>(), Loc, 1661 IndexVariables.data(), 1662 IndexVariables.size()); 1663 return false; 1664 } 1665 1666 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1667 1668 QualType FieldBaseElementType = 1669 SemaRef.Context.getBaseElementType(Field->getType()); 1670 1671 if (FieldBaseElementType->isRecordType()) { 1672 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1673 InitializationKind InitKind = 1674 InitializationKind::CreateDefault(Constructor->getLocation()); 1675 1676 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1677 Sema::OwningExprResult MemberInit = 1678 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1679 Sema::MultiExprArg(SemaRef, 0, 0)); 1680 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1681 if (MemberInit.isInvalid()) 1682 return true; 1683 1684 CXXMemberInit = 1685 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1686 Field, SourceLocation(), 1687 SourceLocation(), 1688 MemberInit.takeAs<Expr>(), 1689 SourceLocation()); 1690 return false; 1691 } 1692 1693 if (FieldBaseElementType->isReferenceType()) { 1694 SemaRef.Diag(Constructor->getLocation(), 1695 diag::err_uninitialized_member_in_ctor) 1696 << (int)Constructor->isImplicit() 1697 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1698 << 0 << Field->getDeclName(); 1699 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1700 return true; 1701 } 1702 1703 if (FieldBaseElementType.isConstQualified()) { 1704 SemaRef.Diag(Constructor->getLocation(), 1705 diag::err_uninitialized_member_in_ctor) 1706 << (int)Constructor->isImplicit() 1707 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1708 << 1 << Field->getDeclName(); 1709 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1710 return true; 1711 } 1712 1713 // Nothing to initialize. 1714 CXXMemberInit = 0; 1715 return false; 1716} 1717 1718bool 1719Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1720 CXXBaseOrMemberInitializer **Initializers, 1721 unsigned NumInitializers, 1722 bool AnyErrors) { 1723 if (Constructor->getDeclContext()->isDependentContext()) { 1724 // Just store the initializers as written, they will be checked during 1725 // instantiation. 1726 if (NumInitializers > 0) { 1727 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1728 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1729 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1730 memcpy(baseOrMemberInitializers, Initializers, 1731 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1732 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1733 } 1734 1735 return false; 1736 } 1737 1738 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1739 1740 // FIXME: Handle implicit move constructors. 1741 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1742 ImplicitInitKind = IIK_Copy; 1743 1744 // We need to build the initializer AST according to order of construction 1745 // and not what user specified in the Initializers list. 1746 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1747 if (!ClassDecl) 1748 return true; 1749 1750 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1751 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1752 bool HadError = false; 1753 1754 for (unsigned i = 0; i < NumInitializers; i++) { 1755 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1756 1757 if (Member->isBaseInitializer()) 1758 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1759 else 1760 AllBaseFields[Member->getMember()] = Member; 1761 } 1762 1763 // Keep track of the direct virtual bases. 1764 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1765 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1766 E = ClassDecl->bases_end(); I != E; ++I) { 1767 if (I->isVirtual()) 1768 DirectVBases.insert(I); 1769 } 1770 1771 // Push virtual bases before others. 1772 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1773 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1774 1775 if (CXXBaseOrMemberInitializer *Value 1776 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1777 AllToInit.push_back(Value); 1778 } else if (!AnyErrors) { 1779 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1780 CXXBaseOrMemberInitializer *CXXBaseInit; 1781 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1782 VBase, IsInheritedVirtualBase, 1783 CXXBaseInit)) { 1784 HadError = true; 1785 continue; 1786 } 1787 1788 AllToInit.push_back(CXXBaseInit); 1789 } 1790 } 1791 1792 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1793 E = ClassDecl->bases_end(); Base != E; ++Base) { 1794 // Virtuals are in the virtual base list and already constructed. 1795 if (Base->isVirtual()) 1796 continue; 1797 1798 if (CXXBaseOrMemberInitializer *Value 1799 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1800 AllToInit.push_back(Value); 1801 } else if (!AnyErrors) { 1802 CXXBaseOrMemberInitializer *CXXBaseInit; 1803 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1804 Base, /*IsInheritedVirtualBase=*/false, 1805 CXXBaseInit)) { 1806 HadError = true; 1807 continue; 1808 } 1809 1810 AllToInit.push_back(CXXBaseInit); 1811 } 1812 } 1813 1814 // non-static data members. 1815 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1816 E = ClassDecl->field_end(); Field != E; ++Field) { 1817 if ((*Field)->isAnonymousStructOrUnion()) { 1818 if (const RecordType *FieldClassType = 1819 Field->getType()->getAs<RecordType>()) { 1820 CXXRecordDecl *FieldClassDecl 1821 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1822 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1823 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1824 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1825 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1826 // set to the anonymous union data member used in the initializer 1827 // list. 1828 Value->setMember(*Field); 1829 Value->setAnonUnionMember(*FA); 1830 AllToInit.push_back(Value); 1831 break; 1832 } 1833 } 1834 } 1835 1836 if (ImplicitInitKind == IIK_Default) 1837 continue; 1838 } 1839 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1840 AllToInit.push_back(Value); 1841 continue; 1842 } 1843 1844 if (AnyErrors) 1845 continue; 1846 1847 CXXBaseOrMemberInitializer *Member; 1848 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1849 *Field, Member)) { 1850 HadError = true; 1851 continue; 1852 } 1853 1854 // If the member doesn't need to be initialized, it will be null. 1855 if (Member) 1856 AllToInit.push_back(Member); 1857 } 1858 1859 NumInitializers = AllToInit.size(); 1860 if (NumInitializers > 0) { 1861 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1862 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1863 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1864 memcpy(baseOrMemberInitializers, AllToInit.data(), 1865 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1866 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1867 1868 // Constructors implicitly reference the base and member 1869 // destructors. 1870 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1871 Constructor->getParent()); 1872 } 1873 1874 return HadError; 1875} 1876 1877static void *GetKeyForTopLevelField(FieldDecl *Field) { 1878 // For anonymous unions, use the class declaration as the key. 1879 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1880 if (RT->getDecl()->isAnonymousStructOrUnion()) 1881 return static_cast<void *>(RT->getDecl()); 1882 } 1883 return static_cast<void *>(Field); 1884} 1885 1886static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1887 return Context.getCanonicalType(BaseType).getTypePtr(); 1888} 1889 1890static void *GetKeyForMember(ASTContext &Context, 1891 CXXBaseOrMemberInitializer *Member, 1892 bool MemberMaybeAnon = false) { 1893 if (!Member->isMemberInitializer()) 1894 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1895 1896 // For fields injected into the class via declaration of an anonymous union, 1897 // use its anonymous union class declaration as the unique key. 1898 FieldDecl *Field = Member->getMember(); 1899 1900 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1901 // data member of the class. Data member used in the initializer list is 1902 // in AnonUnionMember field. 1903 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1904 Field = Member->getAnonUnionMember(); 1905 1906 // If the field is a member of an anonymous struct or union, our key 1907 // is the anonymous record decl that's a direct child of the class. 1908 RecordDecl *RD = Field->getParent(); 1909 if (RD->isAnonymousStructOrUnion()) { 1910 while (true) { 1911 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1912 if (Parent->isAnonymousStructOrUnion()) 1913 RD = Parent; 1914 else 1915 break; 1916 } 1917 1918 return static_cast<void *>(RD); 1919 } 1920 1921 return static_cast<void *>(Field); 1922} 1923 1924static void 1925DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1926 const CXXConstructorDecl *Constructor, 1927 CXXBaseOrMemberInitializer **Inits, 1928 unsigned NumInits) { 1929 if (Constructor->getDeclContext()->isDependentContext()) 1930 return; 1931 1932 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1933 == Diagnostic::Ignored) 1934 return; 1935 1936 // Build the list of bases and members in the order that they'll 1937 // actually be initialized. The explicit initializers should be in 1938 // this same order but may be missing things. 1939 llvm::SmallVector<const void*, 32> IdealInitKeys; 1940 1941 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1942 1943 // 1. Virtual bases. 1944 for (CXXRecordDecl::base_class_const_iterator VBase = 1945 ClassDecl->vbases_begin(), 1946 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1947 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1948 1949 // 2. Non-virtual bases. 1950 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1951 E = ClassDecl->bases_end(); Base != E; ++Base) { 1952 if (Base->isVirtual()) 1953 continue; 1954 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1955 } 1956 1957 // 3. Direct fields. 1958 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1959 E = ClassDecl->field_end(); Field != E; ++Field) 1960 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1961 1962 unsigned NumIdealInits = IdealInitKeys.size(); 1963 unsigned IdealIndex = 0; 1964 1965 CXXBaseOrMemberInitializer *PrevInit = 0; 1966 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1967 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1968 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1969 1970 // Scan forward to try to find this initializer in the idealized 1971 // initializers list. 1972 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1973 if (InitKey == IdealInitKeys[IdealIndex]) 1974 break; 1975 1976 // If we didn't find this initializer, it must be because we 1977 // scanned past it on a previous iteration. That can only 1978 // happen if we're out of order; emit a warning. 1979 if (IdealIndex == NumIdealInits) { 1980 assert(PrevInit && "initializer not found in initializer list"); 1981 1982 Sema::SemaDiagnosticBuilder D = 1983 SemaRef.Diag(PrevInit->getSourceLocation(), 1984 diag::warn_initializer_out_of_order); 1985 1986 if (PrevInit->isMemberInitializer()) 1987 D << 0 << PrevInit->getMember()->getDeclName(); 1988 else 1989 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1990 1991 if (Init->isMemberInitializer()) 1992 D << 0 << Init->getMember()->getDeclName(); 1993 else 1994 D << 1 << Init->getBaseClassInfo()->getType(); 1995 1996 // Move back to the initializer's location in the ideal list. 1997 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1998 if (InitKey == IdealInitKeys[IdealIndex]) 1999 break; 2000 2001 assert(IdealIndex != NumIdealInits && 2002 "initializer not found in initializer list"); 2003 } 2004 2005 PrevInit = Init; 2006 } 2007} 2008 2009namespace { 2010bool CheckRedundantInit(Sema &S, 2011 CXXBaseOrMemberInitializer *Init, 2012 CXXBaseOrMemberInitializer *&PrevInit) { 2013 if (!PrevInit) { 2014 PrevInit = Init; 2015 return false; 2016 } 2017 2018 if (FieldDecl *Field = Init->getMember()) 2019 S.Diag(Init->getSourceLocation(), 2020 diag::err_multiple_mem_initialization) 2021 << Field->getDeclName() 2022 << Init->getSourceRange(); 2023 else { 2024 Type *BaseClass = Init->getBaseClass(); 2025 assert(BaseClass && "neither field nor base"); 2026 S.Diag(Init->getSourceLocation(), 2027 diag::err_multiple_base_initialization) 2028 << QualType(BaseClass, 0) 2029 << Init->getSourceRange(); 2030 } 2031 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2032 << 0 << PrevInit->getSourceRange(); 2033 2034 return true; 2035} 2036 2037typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2038typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2039 2040bool CheckRedundantUnionInit(Sema &S, 2041 CXXBaseOrMemberInitializer *Init, 2042 RedundantUnionMap &Unions) { 2043 FieldDecl *Field = Init->getMember(); 2044 RecordDecl *Parent = Field->getParent(); 2045 if (!Parent->isAnonymousStructOrUnion()) 2046 return false; 2047 2048 NamedDecl *Child = Field; 2049 do { 2050 if (Parent->isUnion()) { 2051 UnionEntry &En = Unions[Parent]; 2052 if (En.first && En.first != Child) { 2053 S.Diag(Init->getSourceLocation(), 2054 diag::err_multiple_mem_union_initialization) 2055 << Field->getDeclName() 2056 << Init->getSourceRange(); 2057 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2058 << 0 << En.second->getSourceRange(); 2059 return true; 2060 } else if (!En.first) { 2061 En.first = Child; 2062 En.second = Init; 2063 } 2064 } 2065 2066 Child = Parent; 2067 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2068 } while (Parent->isAnonymousStructOrUnion()); 2069 2070 return false; 2071} 2072} 2073 2074/// ActOnMemInitializers - Handle the member initializers for a constructor. 2075void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2076 SourceLocation ColonLoc, 2077 MemInitTy **meminits, unsigned NumMemInits, 2078 bool AnyErrors) { 2079 if (!ConstructorDecl) 2080 return; 2081 2082 AdjustDeclIfTemplate(ConstructorDecl); 2083 2084 CXXConstructorDecl *Constructor 2085 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2086 2087 if (!Constructor) { 2088 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2089 return; 2090 } 2091 2092 CXXBaseOrMemberInitializer **MemInits = 2093 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2094 2095 // Mapping for the duplicate initializers check. 2096 // For member initializers, this is keyed with a FieldDecl*. 2097 // For base initializers, this is keyed with a Type*. 2098 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2099 2100 // Mapping for the inconsistent anonymous-union initializers check. 2101 RedundantUnionMap MemberUnions; 2102 2103 bool HadError = false; 2104 for (unsigned i = 0; i < NumMemInits; i++) { 2105 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2106 2107 if (Init->isMemberInitializer()) { 2108 FieldDecl *Field = Init->getMember(); 2109 if (CheckRedundantInit(*this, Init, Members[Field]) || 2110 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2111 HadError = true; 2112 } else { 2113 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2114 if (CheckRedundantInit(*this, Init, Members[Key])) 2115 HadError = true; 2116 } 2117 } 2118 2119 if (HadError) 2120 return; 2121 2122 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2123 2124 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2125} 2126 2127void 2128Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2129 CXXRecordDecl *ClassDecl) { 2130 // Ignore dependent contexts. 2131 if (ClassDecl->isDependentContext()) 2132 return; 2133 2134 // FIXME: all the access-control diagnostics are positioned on the 2135 // field/base declaration. That's probably good; that said, the 2136 // user might reasonably want to know why the destructor is being 2137 // emitted, and we currently don't say. 2138 2139 // Non-static data members. 2140 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2141 E = ClassDecl->field_end(); I != E; ++I) { 2142 FieldDecl *Field = *I; 2143 if (Field->isInvalidDecl()) 2144 continue; 2145 QualType FieldType = Context.getBaseElementType(Field->getType()); 2146 2147 const RecordType* RT = FieldType->getAs<RecordType>(); 2148 if (!RT) 2149 continue; 2150 2151 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2152 if (FieldClassDecl->hasTrivialDestructor()) 2153 continue; 2154 2155 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2156 CheckDestructorAccess(Field->getLocation(), Dtor, 2157 PDiag(diag::err_access_dtor_field) 2158 << Field->getDeclName() 2159 << FieldType); 2160 2161 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2162 } 2163 2164 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2165 2166 // Bases. 2167 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2168 E = ClassDecl->bases_end(); Base != E; ++Base) { 2169 // Bases are always records in a well-formed non-dependent class. 2170 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2171 2172 // Remember direct virtual bases. 2173 if (Base->isVirtual()) 2174 DirectVirtualBases.insert(RT); 2175 2176 // Ignore trivial destructors. 2177 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2178 if (BaseClassDecl->hasTrivialDestructor()) 2179 continue; 2180 2181 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2182 2183 // FIXME: caret should be on the start of the class name 2184 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2185 PDiag(diag::err_access_dtor_base) 2186 << Base->getType() 2187 << Base->getSourceRange()); 2188 2189 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2190 } 2191 2192 // Virtual bases. 2193 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2194 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2195 2196 // Bases are always records in a well-formed non-dependent class. 2197 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2198 2199 // Ignore direct virtual bases. 2200 if (DirectVirtualBases.count(RT)) 2201 continue; 2202 2203 // Ignore trivial destructors. 2204 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2205 if (BaseClassDecl->hasTrivialDestructor()) 2206 continue; 2207 2208 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2209 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2210 PDiag(diag::err_access_dtor_vbase) 2211 << VBase->getType()); 2212 2213 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2214 } 2215} 2216 2217void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2218 if (!CDtorDecl) 2219 return; 2220 2221 if (CXXConstructorDecl *Constructor 2222 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2223 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2224} 2225 2226bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2227 unsigned DiagID, AbstractDiagSelID SelID, 2228 const CXXRecordDecl *CurrentRD) { 2229 if (SelID == -1) 2230 return RequireNonAbstractType(Loc, T, 2231 PDiag(DiagID), CurrentRD); 2232 else 2233 return RequireNonAbstractType(Loc, T, 2234 PDiag(DiagID) << SelID, CurrentRD); 2235} 2236 2237bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2238 const PartialDiagnostic &PD, 2239 const CXXRecordDecl *CurrentRD) { 2240 if (!getLangOptions().CPlusPlus) 2241 return false; 2242 2243 if (const ArrayType *AT = Context.getAsArrayType(T)) 2244 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2245 CurrentRD); 2246 2247 if (const PointerType *PT = T->getAs<PointerType>()) { 2248 // Find the innermost pointer type. 2249 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2250 PT = T; 2251 2252 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2253 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2254 } 2255 2256 const RecordType *RT = T->getAs<RecordType>(); 2257 if (!RT) 2258 return false; 2259 2260 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2261 2262 if (CurrentRD && CurrentRD != RD) 2263 return false; 2264 2265 // FIXME: is this reasonable? It matches current behavior, but.... 2266 if (!RD->getDefinition()) 2267 return false; 2268 2269 if (!RD->isAbstract()) 2270 return false; 2271 2272 Diag(Loc, PD) << RD->getDeclName(); 2273 2274 // Check if we've already emitted the list of pure virtual functions for this 2275 // class. 2276 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2277 return true; 2278 2279 CXXFinalOverriderMap FinalOverriders; 2280 RD->getFinalOverriders(FinalOverriders); 2281 2282 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2283 MEnd = FinalOverriders.end(); 2284 M != MEnd; 2285 ++M) { 2286 for (OverridingMethods::iterator SO = M->second.begin(), 2287 SOEnd = M->second.end(); 2288 SO != SOEnd; ++SO) { 2289 // C++ [class.abstract]p4: 2290 // A class is abstract if it contains or inherits at least one 2291 // pure virtual function for which the final overrider is pure 2292 // virtual. 2293 2294 // 2295 if (SO->second.size() != 1) 2296 continue; 2297 2298 if (!SO->second.front().Method->isPure()) 2299 continue; 2300 2301 Diag(SO->second.front().Method->getLocation(), 2302 diag::note_pure_virtual_function) 2303 << SO->second.front().Method->getDeclName(); 2304 } 2305 } 2306 2307 if (!PureVirtualClassDiagSet) 2308 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2309 PureVirtualClassDiagSet->insert(RD); 2310 2311 return true; 2312} 2313 2314namespace { 2315 class AbstractClassUsageDiagnoser 2316 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2317 Sema &SemaRef; 2318 CXXRecordDecl *AbstractClass; 2319 2320 bool VisitDeclContext(const DeclContext *DC) { 2321 bool Invalid = false; 2322 2323 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2324 E = DC->decls_end(); I != E; ++I) 2325 Invalid |= Visit(*I); 2326 2327 return Invalid; 2328 } 2329 2330 public: 2331 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2332 : SemaRef(SemaRef), AbstractClass(ac) { 2333 Visit(SemaRef.Context.getTranslationUnitDecl()); 2334 } 2335 2336 bool VisitFunctionDecl(const FunctionDecl *FD) { 2337 if (FD->isThisDeclarationADefinition()) { 2338 // No need to do the check if we're in a definition, because it requires 2339 // that the return/param types are complete. 2340 // because that requires 2341 return VisitDeclContext(FD); 2342 } 2343 2344 // Check the return type. 2345 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2346 bool Invalid = 2347 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2348 diag::err_abstract_type_in_decl, 2349 Sema::AbstractReturnType, 2350 AbstractClass); 2351 2352 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2353 E = FD->param_end(); I != E; ++I) { 2354 const ParmVarDecl *VD = *I; 2355 Invalid |= 2356 SemaRef.RequireNonAbstractType(VD->getLocation(), 2357 VD->getOriginalType(), 2358 diag::err_abstract_type_in_decl, 2359 Sema::AbstractParamType, 2360 AbstractClass); 2361 } 2362 2363 return Invalid; 2364 } 2365 2366 bool VisitDecl(const Decl* D) { 2367 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2368 return VisitDeclContext(DC); 2369 2370 return false; 2371 } 2372 }; 2373} 2374 2375/// \brief Perform semantic checks on a class definition that has been 2376/// completing, introducing implicitly-declared members, checking for 2377/// abstract types, etc. 2378void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2379 if (!Record || Record->isInvalidDecl()) 2380 return; 2381 2382 if (!Record->isDependentType()) 2383 AddImplicitlyDeclaredMembersToClass(S, Record); 2384 2385 if (Record->isInvalidDecl()) 2386 return; 2387 2388 // Set access bits correctly on the directly-declared conversions. 2389 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2390 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2391 Convs->setAccess(I, (*I)->getAccess()); 2392 2393 // Determine whether we need to check for final overriders. We do 2394 // this either when there are virtual base classes (in which case we 2395 // may end up finding multiple final overriders for a given virtual 2396 // function) or any of the base classes is abstract (in which case 2397 // we might detect that this class is abstract). 2398 bool CheckFinalOverriders = false; 2399 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2400 !Record->isDependentType()) { 2401 if (Record->getNumVBases()) 2402 CheckFinalOverriders = true; 2403 else if (!Record->isAbstract()) { 2404 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2405 BEnd = Record->bases_end(); 2406 B != BEnd; ++B) { 2407 CXXRecordDecl *BaseDecl 2408 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2409 if (BaseDecl->isAbstract()) { 2410 CheckFinalOverriders = true; 2411 break; 2412 } 2413 } 2414 } 2415 } 2416 2417 if (CheckFinalOverriders) { 2418 CXXFinalOverriderMap FinalOverriders; 2419 Record->getFinalOverriders(FinalOverriders); 2420 2421 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2422 MEnd = FinalOverriders.end(); 2423 M != MEnd; ++M) { 2424 for (OverridingMethods::iterator SO = M->second.begin(), 2425 SOEnd = M->second.end(); 2426 SO != SOEnd; ++SO) { 2427 assert(SO->second.size() > 0 && 2428 "All virtual functions have overridding virtual functions"); 2429 if (SO->second.size() == 1) { 2430 // C++ [class.abstract]p4: 2431 // A class is abstract if it contains or inherits at least one 2432 // pure virtual function for which the final overrider is pure 2433 // virtual. 2434 if (SO->second.front().Method->isPure()) 2435 Record->setAbstract(true); 2436 continue; 2437 } 2438 2439 // C++ [class.virtual]p2: 2440 // In a derived class, if a virtual member function of a base 2441 // class subobject has more than one final overrider the 2442 // program is ill-formed. 2443 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2444 << (NamedDecl *)M->first << Record; 2445 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2446 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2447 OMEnd = SO->second.end(); 2448 OM != OMEnd; ++OM) 2449 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2450 << (NamedDecl *)M->first << OM->Method->getParent(); 2451 2452 Record->setInvalidDecl(); 2453 } 2454 } 2455 } 2456 2457 if (Record->isAbstract() && !Record->isInvalidDecl()) 2458 (void)AbstractClassUsageDiagnoser(*this, Record); 2459 2460 // If this is not an aggregate type and has no user-declared constructor, 2461 // complain about any non-static data members of reference or const scalar 2462 // type, since they will never get initializers. 2463 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2464 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2465 bool Complained = false; 2466 for (RecordDecl::field_iterator F = Record->field_begin(), 2467 FEnd = Record->field_end(); 2468 F != FEnd; ++F) { 2469 if (F->getType()->isReferenceType() || 2470 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2471 if (!Complained) { 2472 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2473 << Record->getTagKind() << Record; 2474 Complained = true; 2475 } 2476 2477 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2478 << F->getType()->isReferenceType() 2479 << F->getDeclName(); 2480 } 2481 } 2482 } 2483 2484 if (Record->isDynamicClass()) 2485 DynamicClasses.push_back(Record); 2486} 2487 2488void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2489 DeclPtrTy TagDecl, 2490 SourceLocation LBrac, 2491 SourceLocation RBrac, 2492 AttributeList *AttrList) { 2493 if (!TagDecl) 2494 return; 2495 2496 AdjustDeclIfTemplate(TagDecl); 2497 2498 ActOnFields(S, RLoc, TagDecl, 2499 (DeclPtrTy*)FieldCollector->getCurFields(), 2500 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2501 2502 CheckCompletedCXXClass(S, 2503 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2504} 2505 2506/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2507/// special functions, such as the default constructor, copy 2508/// constructor, or destructor, to the given C++ class (C++ 2509/// [special]p1). This routine can only be executed just before the 2510/// definition of the class is complete. 2511/// 2512/// The scope, if provided, is the class scope. 2513void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2514 CXXRecordDecl *ClassDecl) { 2515 CanQualType ClassType 2516 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2517 2518 // FIXME: Implicit declarations have exception specifications, which are 2519 // the union of the specifications of the implicitly called functions. 2520 2521 if (!ClassDecl->hasUserDeclaredConstructor()) { 2522 // C++ [class.ctor]p5: 2523 // A default constructor for a class X is a constructor of class X 2524 // that can be called without an argument. If there is no 2525 // user-declared constructor for class X, a default constructor is 2526 // implicitly declared. An implicitly-declared default constructor 2527 // is an inline public member of its class. 2528 DeclarationName Name 2529 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2530 CXXConstructorDecl *DefaultCon = 2531 CXXConstructorDecl::Create(Context, ClassDecl, 2532 ClassDecl->getLocation(), Name, 2533 Context.getFunctionType(Context.VoidTy, 2534 0, 0, false, 0, 2535 /*FIXME*/false, false, 2536 0, 0, 2537 FunctionType::ExtInfo()), 2538 /*TInfo=*/0, 2539 /*isExplicit=*/false, 2540 /*isInline=*/true, 2541 /*isImplicitlyDeclared=*/true); 2542 DefaultCon->setAccess(AS_public); 2543 DefaultCon->setImplicit(); 2544 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2545 if (S) 2546 PushOnScopeChains(DefaultCon, S, true); 2547 else 2548 ClassDecl->addDecl(DefaultCon); 2549 } 2550 2551 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2552 // C++ [class.copy]p4: 2553 // If the class definition does not explicitly declare a copy 2554 // constructor, one is declared implicitly. 2555 2556 // C++ [class.copy]p5: 2557 // The implicitly-declared copy constructor for a class X will 2558 // have the form 2559 // 2560 // X::X(const X&) 2561 // 2562 // if 2563 bool HasConstCopyConstructor = true; 2564 2565 // -- each direct or virtual base class B of X has a copy 2566 // constructor whose first parameter is of type const B& or 2567 // const volatile B&, and 2568 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2569 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2570 const CXXRecordDecl *BaseClassDecl 2571 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2572 HasConstCopyConstructor 2573 = BaseClassDecl->hasConstCopyConstructor(Context); 2574 } 2575 2576 // -- for all the nonstatic data members of X that are of a 2577 // class type M (or array thereof), each such class type 2578 // has a copy constructor whose first parameter is of type 2579 // const M& or const volatile M&. 2580 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2581 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2582 ++Field) { 2583 QualType FieldType = (*Field)->getType(); 2584 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2585 FieldType = Array->getElementType(); 2586 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2587 const CXXRecordDecl *FieldClassDecl 2588 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2589 HasConstCopyConstructor 2590 = FieldClassDecl->hasConstCopyConstructor(Context); 2591 } 2592 } 2593 2594 // Otherwise, the implicitly declared copy constructor will have 2595 // the form 2596 // 2597 // X::X(X&) 2598 QualType ArgType = ClassType; 2599 if (HasConstCopyConstructor) 2600 ArgType = ArgType.withConst(); 2601 ArgType = Context.getLValueReferenceType(ArgType); 2602 2603 // An implicitly-declared copy constructor is an inline public 2604 // member of its class. 2605 DeclarationName Name 2606 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2607 CXXConstructorDecl *CopyConstructor 2608 = CXXConstructorDecl::Create(Context, ClassDecl, 2609 ClassDecl->getLocation(), Name, 2610 Context.getFunctionType(Context.VoidTy, 2611 &ArgType, 1, 2612 false, 0, 2613 /*FIXME: hasExceptionSpec*/false, 2614 false, 0, 0, 2615 FunctionType::ExtInfo()), 2616 /*TInfo=*/0, 2617 /*isExplicit=*/false, 2618 /*isInline=*/true, 2619 /*isImplicitlyDeclared=*/true); 2620 CopyConstructor->setAccess(AS_public); 2621 CopyConstructor->setImplicit(); 2622 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2623 2624 // Add the parameter to the constructor. 2625 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2626 ClassDecl->getLocation(), 2627 /*IdentifierInfo=*/0, 2628 ArgType, /*TInfo=*/0, 2629 VarDecl::None, 2630 VarDecl::None, 0); 2631 CopyConstructor->setParams(&FromParam, 1); 2632 if (S) 2633 PushOnScopeChains(CopyConstructor, S, true); 2634 else 2635 ClassDecl->addDecl(CopyConstructor); 2636 } 2637 2638 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2639 // Note: The following rules are largely analoguous to the copy 2640 // constructor rules. Note that virtual bases are not taken into account 2641 // for determining the argument type of the operator. Note also that 2642 // operators taking an object instead of a reference are allowed. 2643 // 2644 // C++ [class.copy]p10: 2645 // If the class definition does not explicitly declare a copy 2646 // assignment operator, one is declared implicitly. 2647 // The implicitly-defined copy assignment operator for a class X 2648 // will have the form 2649 // 2650 // X& X::operator=(const X&) 2651 // 2652 // if 2653 bool HasConstCopyAssignment = true; 2654 2655 // -- each direct base class B of X has a copy assignment operator 2656 // whose parameter is of type const B&, const volatile B& or B, 2657 // and 2658 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2659 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2660 assert(!Base->getType()->isDependentType() && 2661 "Cannot generate implicit members for class with dependent bases."); 2662 const CXXRecordDecl *BaseClassDecl 2663 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2664 const CXXMethodDecl *MD = 0; 2665 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2666 MD); 2667 } 2668 2669 // -- for all the nonstatic data members of X that are of a class 2670 // type M (or array thereof), each such class type has a copy 2671 // assignment operator whose parameter is of type const M&, 2672 // const volatile M& or M. 2673 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2674 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2675 ++Field) { 2676 QualType FieldType = (*Field)->getType(); 2677 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2678 FieldType = Array->getElementType(); 2679 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2680 const CXXRecordDecl *FieldClassDecl 2681 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2682 const CXXMethodDecl *MD = 0; 2683 HasConstCopyAssignment 2684 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2685 } 2686 } 2687 2688 // Otherwise, the implicitly declared copy assignment operator will 2689 // have the form 2690 // 2691 // X& X::operator=(X&) 2692 QualType ArgType = ClassType; 2693 QualType RetType = Context.getLValueReferenceType(ArgType); 2694 if (HasConstCopyAssignment) 2695 ArgType = ArgType.withConst(); 2696 ArgType = Context.getLValueReferenceType(ArgType); 2697 2698 // An implicitly-declared copy assignment operator is an inline public 2699 // member of its class. 2700 DeclarationName Name = 2701 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2702 CXXMethodDecl *CopyAssignment = 2703 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2704 Context.getFunctionType(RetType, &ArgType, 1, 2705 false, 0, 2706 /*FIXME: hasExceptionSpec*/false, 2707 false, 0, 0, 2708 FunctionType::ExtInfo()), 2709 /*TInfo=*/0, /*isStatic=*/false, 2710 /*StorageClassAsWritten=*/FunctionDecl::None, 2711 /*isInline=*/true); 2712 CopyAssignment->setAccess(AS_public); 2713 CopyAssignment->setImplicit(); 2714 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2715 CopyAssignment->setCopyAssignment(true); 2716 2717 // Add the parameter to the operator. 2718 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2719 ClassDecl->getLocation(), 2720 /*Id=*/0, 2721 ArgType, /*TInfo=*/0, 2722 VarDecl::None, 2723 VarDecl::None, 0); 2724 CopyAssignment->setParams(&FromParam, 1); 2725 2726 // Don't call addedAssignmentOperator. There is no way to distinguish an 2727 // implicit from an explicit assignment operator. 2728 if (S) 2729 PushOnScopeChains(CopyAssignment, S, true); 2730 else 2731 ClassDecl->addDecl(CopyAssignment); 2732 AddOverriddenMethods(ClassDecl, CopyAssignment); 2733 } 2734 2735 if (!ClassDecl->hasUserDeclaredDestructor()) { 2736 // C++ [class.dtor]p2: 2737 // If a class has no user-declared destructor, a destructor is 2738 // declared implicitly. An implicitly-declared destructor is an 2739 // inline public member of its class. 2740 QualType Ty = Context.getFunctionType(Context.VoidTy, 2741 0, 0, false, 0, 2742 /*FIXME: hasExceptionSpec*/false, 2743 false, 0, 0, FunctionType::ExtInfo()); 2744 2745 DeclarationName Name 2746 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2747 CXXDestructorDecl *Destructor 2748 = CXXDestructorDecl::Create(Context, ClassDecl, 2749 ClassDecl->getLocation(), Name, Ty, 2750 /*isInline=*/true, 2751 /*isImplicitlyDeclared=*/true); 2752 Destructor->setAccess(AS_public); 2753 Destructor->setImplicit(); 2754 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2755 if (S) 2756 PushOnScopeChains(Destructor, S, true); 2757 else 2758 ClassDecl->addDecl(Destructor); 2759 2760 // This could be uniqued if it ever proves significant. 2761 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2762 2763 AddOverriddenMethods(ClassDecl, Destructor); 2764 } 2765} 2766 2767void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2768 Decl *D = TemplateD.getAs<Decl>(); 2769 if (!D) 2770 return; 2771 2772 TemplateParameterList *Params = 0; 2773 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2774 Params = Template->getTemplateParameters(); 2775 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2776 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2777 Params = PartialSpec->getTemplateParameters(); 2778 else 2779 return; 2780 2781 for (TemplateParameterList::iterator Param = Params->begin(), 2782 ParamEnd = Params->end(); 2783 Param != ParamEnd; ++Param) { 2784 NamedDecl *Named = cast<NamedDecl>(*Param); 2785 if (Named->getDeclName()) { 2786 S->AddDecl(DeclPtrTy::make(Named)); 2787 IdResolver.AddDecl(Named); 2788 } 2789 } 2790} 2791 2792void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2793 if (!RecordD) return; 2794 AdjustDeclIfTemplate(RecordD); 2795 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2796 PushDeclContext(S, Record); 2797} 2798 2799void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2800 if (!RecordD) return; 2801 PopDeclContext(); 2802} 2803 2804/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2805/// parsing a top-level (non-nested) C++ class, and we are now 2806/// parsing those parts of the given Method declaration that could 2807/// not be parsed earlier (C++ [class.mem]p2), such as default 2808/// arguments. This action should enter the scope of the given 2809/// Method declaration as if we had just parsed the qualified method 2810/// name. However, it should not bring the parameters into scope; 2811/// that will be performed by ActOnDelayedCXXMethodParameter. 2812void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2813} 2814 2815/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2816/// C++ method declaration. We're (re-)introducing the given 2817/// function parameter into scope for use in parsing later parts of 2818/// the method declaration. For example, we could see an 2819/// ActOnParamDefaultArgument event for this parameter. 2820void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2821 if (!ParamD) 2822 return; 2823 2824 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2825 2826 // If this parameter has an unparsed default argument, clear it out 2827 // to make way for the parsed default argument. 2828 if (Param->hasUnparsedDefaultArg()) 2829 Param->setDefaultArg(0); 2830 2831 S->AddDecl(DeclPtrTy::make(Param)); 2832 if (Param->getDeclName()) 2833 IdResolver.AddDecl(Param); 2834} 2835 2836/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2837/// processing the delayed method declaration for Method. The method 2838/// declaration is now considered finished. There may be a separate 2839/// ActOnStartOfFunctionDef action later (not necessarily 2840/// immediately!) for this method, if it was also defined inside the 2841/// class body. 2842void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2843 if (!MethodD) 2844 return; 2845 2846 AdjustDeclIfTemplate(MethodD); 2847 2848 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2849 2850 // Now that we have our default arguments, check the constructor 2851 // again. It could produce additional diagnostics or affect whether 2852 // the class has implicitly-declared destructors, among other 2853 // things. 2854 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2855 CheckConstructor(Constructor); 2856 2857 // Check the default arguments, which we may have added. 2858 if (!Method->isInvalidDecl()) 2859 CheckCXXDefaultArguments(Method); 2860} 2861 2862/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2863/// the well-formedness of the constructor declarator @p D with type @p 2864/// R. If there are any errors in the declarator, this routine will 2865/// emit diagnostics and set the invalid bit to true. In any case, the type 2866/// will be updated to reflect a well-formed type for the constructor and 2867/// returned. 2868QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2869 FunctionDecl::StorageClass &SC) { 2870 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2871 2872 // C++ [class.ctor]p3: 2873 // A constructor shall not be virtual (10.3) or static (9.4). A 2874 // constructor can be invoked for a const, volatile or const 2875 // volatile object. A constructor shall not be declared const, 2876 // volatile, or const volatile (9.3.2). 2877 if (isVirtual) { 2878 if (!D.isInvalidType()) 2879 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2880 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2881 << SourceRange(D.getIdentifierLoc()); 2882 D.setInvalidType(); 2883 } 2884 if (SC == FunctionDecl::Static) { 2885 if (!D.isInvalidType()) 2886 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2887 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2888 << SourceRange(D.getIdentifierLoc()); 2889 D.setInvalidType(); 2890 SC = FunctionDecl::None; 2891 } 2892 2893 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2894 if (FTI.TypeQuals != 0) { 2895 if (FTI.TypeQuals & Qualifiers::Const) 2896 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2897 << "const" << SourceRange(D.getIdentifierLoc()); 2898 if (FTI.TypeQuals & Qualifiers::Volatile) 2899 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2900 << "volatile" << SourceRange(D.getIdentifierLoc()); 2901 if (FTI.TypeQuals & Qualifiers::Restrict) 2902 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2903 << "restrict" << SourceRange(D.getIdentifierLoc()); 2904 } 2905 2906 // Rebuild the function type "R" without any type qualifiers (in 2907 // case any of the errors above fired) and with "void" as the 2908 // return type, since constructors don't have return types. We 2909 // *always* have to do this, because GetTypeForDeclarator will 2910 // put in a result type of "int" when none was specified. 2911 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2912 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2913 Proto->getNumArgs(), 2914 Proto->isVariadic(), 0, 2915 Proto->hasExceptionSpec(), 2916 Proto->hasAnyExceptionSpec(), 2917 Proto->getNumExceptions(), 2918 Proto->exception_begin(), 2919 Proto->getExtInfo()); 2920} 2921 2922/// CheckConstructor - Checks a fully-formed constructor for 2923/// well-formedness, issuing any diagnostics required. Returns true if 2924/// the constructor declarator is invalid. 2925void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2926 CXXRecordDecl *ClassDecl 2927 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2928 if (!ClassDecl) 2929 return Constructor->setInvalidDecl(); 2930 2931 // C++ [class.copy]p3: 2932 // A declaration of a constructor for a class X is ill-formed if 2933 // its first parameter is of type (optionally cv-qualified) X and 2934 // either there are no other parameters or else all other 2935 // parameters have default arguments. 2936 if (!Constructor->isInvalidDecl() && 2937 ((Constructor->getNumParams() == 1) || 2938 (Constructor->getNumParams() > 1 && 2939 Constructor->getParamDecl(1)->hasDefaultArg())) && 2940 Constructor->getTemplateSpecializationKind() 2941 != TSK_ImplicitInstantiation) { 2942 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2943 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2944 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2945 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2946 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2947 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2948 2949 // FIXME: Rather that making the constructor invalid, we should endeavor 2950 // to fix the type. 2951 Constructor->setInvalidDecl(); 2952 } 2953 } 2954 2955 // Notify the class that we've added a constructor. In principle we 2956 // don't need to do this for out-of-line declarations; in practice 2957 // we only instantiate the most recent declaration of a method, so 2958 // we have to call this for everything but friends. 2959 if (!Constructor->getFriendObjectKind()) 2960 ClassDecl->addedConstructor(Context, Constructor); 2961} 2962 2963/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2964/// issuing any diagnostics required. Returns true on error. 2965bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2966 CXXRecordDecl *RD = Destructor->getParent(); 2967 2968 if (Destructor->isVirtual()) { 2969 SourceLocation Loc; 2970 2971 if (!Destructor->isImplicit()) 2972 Loc = Destructor->getLocation(); 2973 else 2974 Loc = RD->getLocation(); 2975 2976 // If we have a virtual destructor, look up the deallocation function 2977 FunctionDecl *OperatorDelete = 0; 2978 DeclarationName Name = 2979 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2980 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2981 return true; 2982 2983 Destructor->setOperatorDelete(OperatorDelete); 2984 } 2985 2986 return false; 2987} 2988 2989static inline bool 2990FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2991 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2992 FTI.ArgInfo[0].Param && 2993 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2994} 2995 2996/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2997/// the well-formednes of the destructor declarator @p D with type @p 2998/// R. If there are any errors in the declarator, this routine will 2999/// emit diagnostics and set the declarator to invalid. Even if this happens, 3000/// will be updated to reflect a well-formed type for the destructor and 3001/// returned. 3002QualType Sema::CheckDestructorDeclarator(Declarator &D, 3003 FunctionDecl::StorageClass& SC) { 3004 // C++ [class.dtor]p1: 3005 // [...] A typedef-name that names a class is a class-name 3006 // (7.1.3); however, a typedef-name that names a class shall not 3007 // be used as the identifier in the declarator for a destructor 3008 // declaration. 3009 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3010 if (isa<TypedefType>(DeclaratorType)) { 3011 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3012 << DeclaratorType; 3013 D.setInvalidType(); 3014 } 3015 3016 // C++ [class.dtor]p2: 3017 // A destructor is used to destroy objects of its class type. A 3018 // destructor takes no parameters, and no return type can be 3019 // specified for it (not even void). The address of a destructor 3020 // shall not be taken. A destructor shall not be static. A 3021 // destructor can be invoked for a const, volatile or const 3022 // volatile object. A destructor shall not be declared const, 3023 // volatile or const volatile (9.3.2). 3024 if (SC == FunctionDecl::Static) { 3025 if (!D.isInvalidType()) 3026 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3027 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3028 << SourceRange(D.getIdentifierLoc()); 3029 SC = FunctionDecl::None; 3030 D.setInvalidType(); 3031 } 3032 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3033 // Destructors don't have return types, but the parser will 3034 // happily parse something like: 3035 // 3036 // class X { 3037 // float ~X(); 3038 // }; 3039 // 3040 // The return type will be eliminated later. 3041 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3042 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3043 << SourceRange(D.getIdentifierLoc()); 3044 } 3045 3046 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3047 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3048 if (FTI.TypeQuals & Qualifiers::Const) 3049 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3050 << "const" << SourceRange(D.getIdentifierLoc()); 3051 if (FTI.TypeQuals & Qualifiers::Volatile) 3052 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3053 << "volatile" << SourceRange(D.getIdentifierLoc()); 3054 if (FTI.TypeQuals & Qualifiers::Restrict) 3055 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3056 << "restrict" << SourceRange(D.getIdentifierLoc()); 3057 D.setInvalidType(); 3058 } 3059 3060 // Make sure we don't have any parameters. 3061 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3062 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3063 3064 // Delete the parameters. 3065 FTI.freeArgs(); 3066 D.setInvalidType(); 3067 } 3068 3069 // Make sure the destructor isn't variadic. 3070 if (FTI.isVariadic) { 3071 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3072 D.setInvalidType(); 3073 } 3074 3075 // Rebuild the function type "R" without any type qualifiers or 3076 // parameters (in case any of the errors above fired) and with 3077 // "void" as the return type, since destructors don't have return 3078 // types. We *always* have to do this, because GetTypeForDeclarator 3079 // will put in a result type of "int" when none was specified. 3080 // FIXME: Exceptions! 3081 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3082 false, false, 0, 0, FunctionType::ExtInfo()); 3083} 3084 3085/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3086/// well-formednes of the conversion function declarator @p D with 3087/// type @p R. If there are any errors in the declarator, this routine 3088/// will emit diagnostics and return true. Otherwise, it will return 3089/// false. Either way, the type @p R will be updated to reflect a 3090/// well-formed type for the conversion operator. 3091void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3092 FunctionDecl::StorageClass& SC) { 3093 // C++ [class.conv.fct]p1: 3094 // Neither parameter types nor return type can be specified. The 3095 // type of a conversion function (8.3.5) is "function taking no 3096 // parameter returning conversion-type-id." 3097 if (SC == FunctionDecl::Static) { 3098 if (!D.isInvalidType()) 3099 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3100 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3101 << SourceRange(D.getIdentifierLoc()); 3102 D.setInvalidType(); 3103 SC = FunctionDecl::None; 3104 } 3105 3106 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3107 3108 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3109 // Conversion functions don't have return types, but the parser will 3110 // happily parse something like: 3111 // 3112 // class X { 3113 // float operator bool(); 3114 // }; 3115 // 3116 // The return type will be changed later anyway. 3117 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3118 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3119 << SourceRange(D.getIdentifierLoc()); 3120 D.setInvalidType(); 3121 } 3122 3123 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3124 3125 // Make sure we don't have any parameters. 3126 if (Proto->getNumArgs() > 0) { 3127 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3128 3129 // Delete the parameters. 3130 D.getTypeObject(0).Fun.freeArgs(); 3131 D.setInvalidType(); 3132 } else if (Proto->isVariadic()) { 3133 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3134 D.setInvalidType(); 3135 } 3136 3137 // Diagnose "&operator bool()" and other such nonsense. This 3138 // is actually a gcc extension which we don't support. 3139 if (Proto->getResultType() != ConvType) { 3140 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3141 << Proto->getResultType(); 3142 D.setInvalidType(); 3143 ConvType = Proto->getResultType(); 3144 } 3145 3146 // C++ [class.conv.fct]p4: 3147 // The conversion-type-id shall not represent a function type nor 3148 // an array type. 3149 if (ConvType->isArrayType()) { 3150 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3151 ConvType = Context.getPointerType(ConvType); 3152 D.setInvalidType(); 3153 } else if (ConvType->isFunctionType()) { 3154 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3155 ConvType = Context.getPointerType(ConvType); 3156 D.setInvalidType(); 3157 } 3158 3159 // Rebuild the function type "R" without any parameters (in case any 3160 // of the errors above fired) and with the conversion type as the 3161 // return type. 3162 if (D.isInvalidType()) { 3163 R = Context.getFunctionType(ConvType, 0, 0, false, 3164 Proto->getTypeQuals(), 3165 Proto->hasExceptionSpec(), 3166 Proto->hasAnyExceptionSpec(), 3167 Proto->getNumExceptions(), 3168 Proto->exception_begin(), 3169 Proto->getExtInfo()); 3170 } 3171 3172 // C++0x explicit conversion operators. 3173 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3174 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3175 diag::warn_explicit_conversion_functions) 3176 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3177} 3178 3179/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3180/// the declaration of the given C++ conversion function. This routine 3181/// is responsible for recording the conversion function in the C++ 3182/// class, if possible. 3183Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3184 assert(Conversion && "Expected to receive a conversion function declaration"); 3185 3186 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3187 3188 // Make sure we aren't redeclaring the conversion function. 3189 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3190 3191 // C++ [class.conv.fct]p1: 3192 // [...] A conversion function is never used to convert a 3193 // (possibly cv-qualified) object to the (possibly cv-qualified) 3194 // same object type (or a reference to it), to a (possibly 3195 // cv-qualified) base class of that type (or a reference to it), 3196 // or to (possibly cv-qualified) void. 3197 // FIXME: Suppress this warning if the conversion function ends up being a 3198 // virtual function that overrides a virtual function in a base class. 3199 QualType ClassType 3200 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3201 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3202 ConvType = ConvTypeRef->getPointeeType(); 3203 if (ConvType->isRecordType()) { 3204 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3205 if (ConvType == ClassType) 3206 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3207 << ClassType; 3208 else if (IsDerivedFrom(ClassType, ConvType)) 3209 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3210 << ClassType << ConvType; 3211 } else if (ConvType->isVoidType()) { 3212 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3213 << ClassType << ConvType; 3214 } 3215 3216 if (Conversion->getPrimaryTemplate()) { 3217 // ignore specializations 3218 } else if (Conversion->getPreviousDeclaration()) { 3219 if (FunctionTemplateDecl *ConversionTemplate 3220 = Conversion->getDescribedFunctionTemplate()) { 3221 if (ClassDecl->replaceConversion( 3222 ConversionTemplate->getPreviousDeclaration(), 3223 ConversionTemplate)) 3224 return DeclPtrTy::make(ConversionTemplate); 3225 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3226 Conversion)) 3227 return DeclPtrTy::make(Conversion); 3228 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3229 } else if (FunctionTemplateDecl *ConversionTemplate 3230 = Conversion->getDescribedFunctionTemplate()) 3231 ClassDecl->addConversionFunction(ConversionTemplate); 3232 else 3233 ClassDecl->addConversionFunction(Conversion); 3234 3235 return DeclPtrTy::make(Conversion); 3236} 3237 3238//===----------------------------------------------------------------------===// 3239// Namespace Handling 3240//===----------------------------------------------------------------------===// 3241 3242/// ActOnStartNamespaceDef - This is called at the start of a namespace 3243/// definition. 3244Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3245 SourceLocation IdentLoc, 3246 IdentifierInfo *II, 3247 SourceLocation LBrace, 3248 AttributeList *AttrList) { 3249 NamespaceDecl *Namespc = 3250 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3251 Namespc->setLBracLoc(LBrace); 3252 3253 Scope *DeclRegionScope = NamespcScope->getParent(); 3254 3255 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3256 3257 if (II) { 3258 // C++ [namespace.def]p2: 3259 // The identifier in an original-namespace-definition shall not have been 3260 // previously defined in the declarative region in which the 3261 // original-namespace-definition appears. The identifier in an 3262 // original-namespace-definition is the name of the namespace. Subsequently 3263 // in that declarative region, it is treated as an original-namespace-name. 3264 3265 NamedDecl *PrevDecl 3266 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3267 ForRedeclaration); 3268 3269 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3270 // This is an extended namespace definition. 3271 // Attach this namespace decl to the chain of extended namespace 3272 // definitions. 3273 OrigNS->setNextNamespace(Namespc); 3274 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3275 3276 // Remove the previous declaration from the scope. 3277 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3278 IdResolver.RemoveDecl(OrigNS); 3279 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3280 } 3281 } else if (PrevDecl) { 3282 // This is an invalid name redefinition. 3283 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3284 << Namespc->getDeclName(); 3285 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3286 Namespc->setInvalidDecl(); 3287 // Continue on to push Namespc as current DeclContext and return it. 3288 } else if (II->isStr("std") && 3289 CurContext->getLookupContext()->isTranslationUnit()) { 3290 // This is the first "real" definition of the namespace "std", so update 3291 // our cache of the "std" namespace to point at this definition. 3292 if (StdNamespace) { 3293 // We had already defined a dummy namespace "std". Link this new 3294 // namespace definition to the dummy namespace "std". 3295 StdNamespace->setNextNamespace(Namespc); 3296 StdNamespace->setLocation(IdentLoc); 3297 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3298 } 3299 3300 // Make our StdNamespace cache point at the first real definition of the 3301 // "std" namespace. 3302 StdNamespace = Namespc; 3303 } 3304 3305 PushOnScopeChains(Namespc, DeclRegionScope); 3306 } else { 3307 // Anonymous namespaces. 3308 assert(Namespc->isAnonymousNamespace()); 3309 3310 // Link the anonymous namespace into its parent. 3311 NamespaceDecl *PrevDecl; 3312 DeclContext *Parent = CurContext->getLookupContext(); 3313 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3314 PrevDecl = TU->getAnonymousNamespace(); 3315 TU->setAnonymousNamespace(Namespc); 3316 } else { 3317 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3318 PrevDecl = ND->getAnonymousNamespace(); 3319 ND->setAnonymousNamespace(Namespc); 3320 } 3321 3322 // Link the anonymous namespace with its previous declaration. 3323 if (PrevDecl) { 3324 assert(PrevDecl->isAnonymousNamespace()); 3325 assert(!PrevDecl->getNextNamespace()); 3326 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3327 PrevDecl->setNextNamespace(Namespc); 3328 } 3329 3330 CurContext->addDecl(Namespc); 3331 3332 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3333 // behaves as if it were replaced by 3334 // namespace unique { /* empty body */ } 3335 // using namespace unique; 3336 // namespace unique { namespace-body } 3337 // where all occurrences of 'unique' in a translation unit are 3338 // replaced by the same identifier and this identifier differs 3339 // from all other identifiers in the entire program. 3340 3341 // We just create the namespace with an empty name and then add an 3342 // implicit using declaration, just like the standard suggests. 3343 // 3344 // CodeGen enforces the "universally unique" aspect by giving all 3345 // declarations semantically contained within an anonymous 3346 // namespace internal linkage. 3347 3348 if (!PrevDecl) { 3349 UsingDirectiveDecl* UD 3350 = UsingDirectiveDecl::Create(Context, CurContext, 3351 /* 'using' */ LBrace, 3352 /* 'namespace' */ SourceLocation(), 3353 /* qualifier */ SourceRange(), 3354 /* NNS */ NULL, 3355 /* identifier */ SourceLocation(), 3356 Namespc, 3357 /* Ancestor */ CurContext); 3358 UD->setImplicit(); 3359 CurContext->addDecl(UD); 3360 } 3361 } 3362 3363 // Although we could have an invalid decl (i.e. the namespace name is a 3364 // redefinition), push it as current DeclContext and try to continue parsing. 3365 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3366 // for the namespace has the declarations that showed up in that particular 3367 // namespace definition. 3368 PushDeclContext(NamespcScope, Namespc); 3369 return DeclPtrTy::make(Namespc); 3370} 3371 3372/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3373/// is a namespace alias, returns the namespace it points to. 3374static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3375 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3376 return AD->getNamespace(); 3377 return dyn_cast_or_null<NamespaceDecl>(D); 3378} 3379 3380/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3381/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3382void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3383 Decl *Dcl = D.getAs<Decl>(); 3384 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3385 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3386 Namespc->setRBracLoc(RBrace); 3387 PopDeclContext(); 3388} 3389 3390Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3391 SourceLocation UsingLoc, 3392 SourceLocation NamespcLoc, 3393 CXXScopeSpec &SS, 3394 SourceLocation IdentLoc, 3395 IdentifierInfo *NamespcName, 3396 AttributeList *AttrList) { 3397 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3398 assert(NamespcName && "Invalid NamespcName."); 3399 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3400 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3401 3402 UsingDirectiveDecl *UDir = 0; 3403 3404 // Lookup namespace name. 3405 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3406 LookupParsedName(R, S, &SS); 3407 if (R.isAmbiguous()) 3408 return DeclPtrTy(); 3409 3410 if (!R.empty()) { 3411 NamedDecl *Named = R.getFoundDecl(); 3412 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3413 && "expected namespace decl"); 3414 // C++ [namespace.udir]p1: 3415 // A using-directive specifies that the names in the nominated 3416 // namespace can be used in the scope in which the 3417 // using-directive appears after the using-directive. During 3418 // unqualified name lookup (3.4.1), the names appear as if they 3419 // were declared in the nearest enclosing namespace which 3420 // contains both the using-directive and the nominated 3421 // namespace. [Note: in this context, "contains" means "contains 3422 // directly or indirectly". ] 3423 3424 // Find enclosing context containing both using-directive and 3425 // nominated namespace. 3426 NamespaceDecl *NS = getNamespaceDecl(Named); 3427 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3428 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3429 CommonAncestor = CommonAncestor->getParent(); 3430 3431 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3432 SS.getRange(), 3433 (NestedNameSpecifier *)SS.getScopeRep(), 3434 IdentLoc, Named, CommonAncestor); 3435 PushUsingDirective(S, UDir); 3436 } else { 3437 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3438 } 3439 3440 // FIXME: We ignore attributes for now. 3441 delete AttrList; 3442 return DeclPtrTy::make(UDir); 3443} 3444 3445void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3446 // If scope has associated entity, then using directive is at namespace 3447 // or translation unit scope. We add UsingDirectiveDecls, into 3448 // it's lookup structure. 3449 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3450 Ctx->addDecl(UDir); 3451 else 3452 // Otherwise it is block-sope. using-directives will affect lookup 3453 // only to the end of scope. 3454 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3455} 3456 3457 3458Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3459 AccessSpecifier AS, 3460 bool HasUsingKeyword, 3461 SourceLocation UsingLoc, 3462 CXXScopeSpec &SS, 3463 UnqualifiedId &Name, 3464 AttributeList *AttrList, 3465 bool IsTypeName, 3466 SourceLocation TypenameLoc) { 3467 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3468 3469 switch (Name.getKind()) { 3470 case UnqualifiedId::IK_Identifier: 3471 case UnqualifiedId::IK_OperatorFunctionId: 3472 case UnqualifiedId::IK_LiteralOperatorId: 3473 case UnqualifiedId::IK_ConversionFunctionId: 3474 break; 3475 3476 case UnqualifiedId::IK_ConstructorName: 3477 case UnqualifiedId::IK_ConstructorTemplateId: 3478 // C++0x inherited constructors. 3479 if (getLangOptions().CPlusPlus0x) break; 3480 3481 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3482 << SS.getRange(); 3483 return DeclPtrTy(); 3484 3485 case UnqualifiedId::IK_DestructorName: 3486 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3487 << SS.getRange(); 3488 return DeclPtrTy(); 3489 3490 case UnqualifiedId::IK_TemplateId: 3491 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3492 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3493 return DeclPtrTy(); 3494 } 3495 3496 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3497 if (!TargetName) 3498 return DeclPtrTy(); 3499 3500 // Warn about using declarations. 3501 // TODO: store that the declaration was written without 'using' and 3502 // talk about access decls instead of using decls in the 3503 // diagnostics. 3504 if (!HasUsingKeyword) { 3505 UsingLoc = Name.getSourceRange().getBegin(); 3506 3507 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3508 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3509 } 3510 3511 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3512 Name.getSourceRange().getBegin(), 3513 TargetName, AttrList, 3514 /* IsInstantiation */ false, 3515 IsTypeName, TypenameLoc); 3516 if (UD) 3517 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3518 3519 return DeclPtrTy::make(UD); 3520} 3521 3522/// Determines whether to create a using shadow decl for a particular 3523/// decl, given the set of decls existing prior to this using lookup. 3524bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3525 const LookupResult &Previous) { 3526 // Diagnose finding a decl which is not from a base class of the 3527 // current class. We do this now because there are cases where this 3528 // function will silently decide not to build a shadow decl, which 3529 // will pre-empt further diagnostics. 3530 // 3531 // We don't need to do this in C++0x because we do the check once on 3532 // the qualifier. 3533 // 3534 // FIXME: diagnose the following if we care enough: 3535 // struct A { int foo; }; 3536 // struct B : A { using A::foo; }; 3537 // template <class T> struct C : A {}; 3538 // template <class T> struct D : C<T> { using B::foo; } // <--- 3539 // This is invalid (during instantiation) in C++03 because B::foo 3540 // resolves to the using decl in B, which is not a base class of D<T>. 3541 // We can't diagnose it immediately because C<T> is an unknown 3542 // specialization. The UsingShadowDecl in D<T> then points directly 3543 // to A::foo, which will look well-formed when we instantiate. 3544 // The right solution is to not collapse the shadow-decl chain. 3545 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3546 DeclContext *OrigDC = Orig->getDeclContext(); 3547 3548 // Handle enums and anonymous structs. 3549 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3550 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3551 while (OrigRec->isAnonymousStructOrUnion()) 3552 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3553 3554 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3555 if (OrigDC == CurContext) { 3556 Diag(Using->getLocation(), 3557 diag::err_using_decl_nested_name_specifier_is_current_class) 3558 << Using->getNestedNameRange(); 3559 Diag(Orig->getLocation(), diag::note_using_decl_target); 3560 return true; 3561 } 3562 3563 Diag(Using->getNestedNameRange().getBegin(), 3564 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3565 << Using->getTargetNestedNameDecl() 3566 << cast<CXXRecordDecl>(CurContext) 3567 << Using->getNestedNameRange(); 3568 Diag(Orig->getLocation(), diag::note_using_decl_target); 3569 return true; 3570 } 3571 } 3572 3573 if (Previous.empty()) return false; 3574 3575 NamedDecl *Target = Orig; 3576 if (isa<UsingShadowDecl>(Target)) 3577 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3578 3579 // If the target happens to be one of the previous declarations, we 3580 // don't have a conflict. 3581 // 3582 // FIXME: but we might be increasing its access, in which case we 3583 // should redeclare it. 3584 NamedDecl *NonTag = 0, *Tag = 0; 3585 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3586 I != E; ++I) { 3587 NamedDecl *D = (*I)->getUnderlyingDecl(); 3588 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3589 return false; 3590 3591 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3592 } 3593 3594 if (Target->isFunctionOrFunctionTemplate()) { 3595 FunctionDecl *FD; 3596 if (isa<FunctionTemplateDecl>(Target)) 3597 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3598 else 3599 FD = cast<FunctionDecl>(Target); 3600 3601 NamedDecl *OldDecl = 0; 3602 switch (CheckOverload(FD, Previous, OldDecl)) { 3603 case Ovl_Overload: 3604 return false; 3605 3606 case Ovl_NonFunction: 3607 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3608 break; 3609 3610 // We found a decl with the exact signature. 3611 case Ovl_Match: 3612 if (isa<UsingShadowDecl>(OldDecl)) { 3613 // Silently ignore the possible conflict. 3614 return false; 3615 } 3616 3617 // If we're in a record, we want to hide the target, so we 3618 // return true (without a diagnostic) to tell the caller not to 3619 // build a shadow decl. 3620 if (CurContext->isRecord()) 3621 return true; 3622 3623 // If we're not in a record, this is an error. 3624 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3625 break; 3626 } 3627 3628 Diag(Target->getLocation(), diag::note_using_decl_target); 3629 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3630 return true; 3631 } 3632 3633 // Target is not a function. 3634 3635 if (isa<TagDecl>(Target)) { 3636 // No conflict between a tag and a non-tag. 3637 if (!Tag) return false; 3638 3639 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3640 Diag(Target->getLocation(), diag::note_using_decl_target); 3641 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3642 return true; 3643 } 3644 3645 // No conflict between a tag and a non-tag. 3646 if (!NonTag) return false; 3647 3648 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3649 Diag(Target->getLocation(), diag::note_using_decl_target); 3650 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3651 return true; 3652} 3653 3654/// Builds a shadow declaration corresponding to a 'using' declaration. 3655UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3656 UsingDecl *UD, 3657 NamedDecl *Orig) { 3658 3659 // If we resolved to another shadow declaration, just coalesce them. 3660 NamedDecl *Target = Orig; 3661 if (isa<UsingShadowDecl>(Target)) { 3662 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3663 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3664 } 3665 3666 UsingShadowDecl *Shadow 3667 = UsingShadowDecl::Create(Context, CurContext, 3668 UD->getLocation(), UD, Target); 3669 UD->addShadowDecl(Shadow); 3670 3671 if (S) 3672 PushOnScopeChains(Shadow, S); 3673 else 3674 CurContext->addDecl(Shadow); 3675 Shadow->setAccess(UD->getAccess()); 3676 3677 // Register it as a conversion if appropriate. 3678 if (Shadow->getDeclName().getNameKind() 3679 == DeclarationName::CXXConversionFunctionName) 3680 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3681 3682 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3683 Shadow->setInvalidDecl(); 3684 3685 return Shadow; 3686} 3687 3688/// Hides a using shadow declaration. This is required by the current 3689/// using-decl implementation when a resolvable using declaration in a 3690/// class is followed by a declaration which would hide or override 3691/// one or more of the using decl's targets; for example: 3692/// 3693/// struct Base { void foo(int); }; 3694/// struct Derived : Base { 3695/// using Base::foo; 3696/// void foo(int); 3697/// }; 3698/// 3699/// The governing language is C++03 [namespace.udecl]p12: 3700/// 3701/// When a using-declaration brings names from a base class into a 3702/// derived class scope, member functions in the derived class 3703/// override and/or hide member functions with the same name and 3704/// parameter types in a base class (rather than conflicting). 3705/// 3706/// There are two ways to implement this: 3707/// (1) optimistically create shadow decls when they're not hidden 3708/// by existing declarations, or 3709/// (2) don't create any shadow decls (or at least don't make them 3710/// visible) until we've fully parsed/instantiated the class. 3711/// The problem with (1) is that we might have to retroactively remove 3712/// a shadow decl, which requires several O(n) operations because the 3713/// decl structures are (very reasonably) not designed for removal. 3714/// (2) avoids this but is very fiddly and phase-dependent. 3715void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3716 if (Shadow->getDeclName().getNameKind() == 3717 DeclarationName::CXXConversionFunctionName) 3718 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3719 3720 // Remove it from the DeclContext... 3721 Shadow->getDeclContext()->removeDecl(Shadow); 3722 3723 // ...and the scope, if applicable... 3724 if (S) { 3725 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3726 IdResolver.RemoveDecl(Shadow); 3727 } 3728 3729 // ...and the using decl. 3730 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3731 3732 // TODO: complain somehow if Shadow was used. It shouldn't 3733 // be possible for this to happen, because...? 3734} 3735 3736/// Builds a using declaration. 3737/// 3738/// \param IsInstantiation - Whether this call arises from an 3739/// instantiation of an unresolved using declaration. We treat 3740/// the lookup differently for these declarations. 3741NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3742 SourceLocation UsingLoc, 3743 CXXScopeSpec &SS, 3744 SourceLocation IdentLoc, 3745 DeclarationName Name, 3746 AttributeList *AttrList, 3747 bool IsInstantiation, 3748 bool IsTypeName, 3749 SourceLocation TypenameLoc) { 3750 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3751 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3752 3753 // FIXME: We ignore attributes for now. 3754 delete AttrList; 3755 3756 if (SS.isEmpty()) { 3757 Diag(IdentLoc, diag::err_using_requires_qualname); 3758 return 0; 3759 } 3760 3761 // Do the redeclaration lookup in the current scope. 3762 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3763 ForRedeclaration); 3764 Previous.setHideTags(false); 3765 if (S) { 3766 LookupName(Previous, S); 3767 3768 // It is really dumb that we have to do this. 3769 LookupResult::Filter F = Previous.makeFilter(); 3770 while (F.hasNext()) { 3771 NamedDecl *D = F.next(); 3772 if (!isDeclInScope(D, CurContext, S)) 3773 F.erase(); 3774 } 3775 F.done(); 3776 } else { 3777 assert(IsInstantiation && "no scope in non-instantiation"); 3778 assert(CurContext->isRecord() && "scope not record in instantiation"); 3779 LookupQualifiedName(Previous, CurContext); 3780 } 3781 3782 NestedNameSpecifier *NNS = 3783 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3784 3785 // Check for invalid redeclarations. 3786 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3787 return 0; 3788 3789 // Check for bad qualifiers. 3790 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3791 return 0; 3792 3793 DeclContext *LookupContext = computeDeclContext(SS); 3794 NamedDecl *D; 3795 if (!LookupContext) { 3796 if (IsTypeName) { 3797 // FIXME: not all declaration name kinds are legal here 3798 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3799 UsingLoc, TypenameLoc, 3800 SS.getRange(), NNS, 3801 IdentLoc, Name); 3802 } else { 3803 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3804 UsingLoc, SS.getRange(), NNS, 3805 IdentLoc, Name); 3806 } 3807 } else { 3808 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3809 SS.getRange(), UsingLoc, NNS, Name, 3810 IsTypeName); 3811 } 3812 D->setAccess(AS); 3813 CurContext->addDecl(D); 3814 3815 if (!LookupContext) return D; 3816 UsingDecl *UD = cast<UsingDecl>(D); 3817 3818 if (RequireCompleteDeclContext(SS, LookupContext)) { 3819 UD->setInvalidDecl(); 3820 return UD; 3821 } 3822 3823 // Look up the target name. 3824 3825 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3826 3827 // Unlike most lookups, we don't always want to hide tag 3828 // declarations: tag names are visible through the using declaration 3829 // even if hidden by ordinary names, *except* in a dependent context 3830 // where it's important for the sanity of two-phase lookup. 3831 if (!IsInstantiation) 3832 R.setHideTags(false); 3833 3834 LookupQualifiedName(R, LookupContext); 3835 3836 if (R.empty()) { 3837 Diag(IdentLoc, diag::err_no_member) 3838 << Name << LookupContext << SS.getRange(); 3839 UD->setInvalidDecl(); 3840 return UD; 3841 } 3842 3843 if (R.isAmbiguous()) { 3844 UD->setInvalidDecl(); 3845 return UD; 3846 } 3847 3848 if (IsTypeName) { 3849 // If we asked for a typename and got a non-type decl, error out. 3850 if (!R.getAsSingle<TypeDecl>()) { 3851 Diag(IdentLoc, diag::err_using_typename_non_type); 3852 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3853 Diag((*I)->getUnderlyingDecl()->getLocation(), 3854 diag::note_using_decl_target); 3855 UD->setInvalidDecl(); 3856 return UD; 3857 } 3858 } else { 3859 // If we asked for a non-typename and we got a type, error out, 3860 // but only if this is an instantiation of an unresolved using 3861 // decl. Otherwise just silently find the type name. 3862 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3863 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3864 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3865 UD->setInvalidDecl(); 3866 return UD; 3867 } 3868 } 3869 3870 // C++0x N2914 [namespace.udecl]p6: 3871 // A using-declaration shall not name a namespace. 3872 if (R.getAsSingle<NamespaceDecl>()) { 3873 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3874 << SS.getRange(); 3875 UD->setInvalidDecl(); 3876 return UD; 3877 } 3878 3879 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3880 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3881 BuildUsingShadowDecl(S, UD, *I); 3882 } 3883 3884 return UD; 3885} 3886 3887/// Checks that the given using declaration is not an invalid 3888/// redeclaration. Note that this is checking only for the using decl 3889/// itself, not for any ill-formedness among the UsingShadowDecls. 3890bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3891 bool isTypeName, 3892 const CXXScopeSpec &SS, 3893 SourceLocation NameLoc, 3894 const LookupResult &Prev) { 3895 // C++03 [namespace.udecl]p8: 3896 // C++0x [namespace.udecl]p10: 3897 // A using-declaration is a declaration and can therefore be used 3898 // repeatedly where (and only where) multiple declarations are 3899 // allowed. 3900 // 3901 // That's in non-member contexts. 3902 if (!CurContext->getLookupContext()->isRecord()) 3903 return false; 3904 3905 NestedNameSpecifier *Qual 3906 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3907 3908 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3909 NamedDecl *D = *I; 3910 3911 bool DTypename; 3912 NestedNameSpecifier *DQual; 3913 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3914 DTypename = UD->isTypeName(); 3915 DQual = UD->getTargetNestedNameDecl(); 3916 } else if (UnresolvedUsingValueDecl *UD 3917 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3918 DTypename = false; 3919 DQual = UD->getTargetNestedNameSpecifier(); 3920 } else if (UnresolvedUsingTypenameDecl *UD 3921 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3922 DTypename = true; 3923 DQual = UD->getTargetNestedNameSpecifier(); 3924 } else continue; 3925 3926 // using decls differ if one says 'typename' and the other doesn't. 3927 // FIXME: non-dependent using decls? 3928 if (isTypeName != DTypename) continue; 3929 3930 // using decls differ if they name different scopes (but note that 3931 // template instantiation can cause this check to trigger when it 3932 // didn't before instantiation). 3933 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3934 Context.getCanonicalNestedNameSpecifier(DQual)) 3935 continue; 3936 3937 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3938 Diag(D->getLocation(), diag::note_using_decl) << 1; 3939 return true; 3940 } 3941 3942 return false; 3943} 3944 3945 3946/// Checks that the given nested-name qualifier used in a using decl 3947/// in the current context is appropriately related to the current 3948/// scope. If an error is found, diagnoses it and returns true. 3949bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3950 const CXXScopeSpec &SS, 3951 SourceLocation NameLoc) { 3952 DeclContext *NamedContext = computeDeclContext(SS); 3953 3954 if (!CurContext->isRecord()) { 3955 // C++03 [namespace.udecl]p3: 3956 // C++0x [namespace.udecl]p8: 3957 // A using-declaration for a class member shall be a member-declaration. 3958 3959 // If we weren't able to compute a valid scope, it must be a 3960 // dependent class scope. 3961 if (!NamedContext || NamedContext->isRecord()) { 3962 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3963 << SS.getRange(); 3964 return true; 3965 } 3966 3967 // Otherwise, everything is known to be fine. 3968 return false; 3969 } 3970 3971 // The current scope is a record. 3972 3973 // If the named context is dependent, we can't decide much. 3974 if (!NamedContext) { 3975 // FIXME: in C++0x, we can diagnose if we can prove that the 3976 // nested-name-specifier does not refer to a base class, which is 3977 // still possible in some cases. 3978 3979 // Otherwise we have to conservatively report that things might be 3980 // okay. 3981 return false; 3982 } 3983 3984 if (!NamedContext->isRecord()) { 3985 // Ideally this would point at the last name in the specifier, 3986 // but we don't have that level of source info. 3987 Diag(SS.getRange().getBegin(), 3988 diag::err_using_decl_nested_name_specifier_is_not_class) 3989 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3990 return true; 3991 } 3992 3993 if (getLangOptions().CPlusPlus0x) { 3994 // C++0x [namespace.udecl]p3: 3995 // In a using-declaration used as a member-declaration, the 3996 // nested-name-specifier shall name a base class of the class 3997 // being defined. 3998 3999 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4000 cast<CXXRecordDecl>(NamedContext))) { 4001 if (CurContext == NamedContext) { 4002 Diag(NameLoc, 4003 diag::err_using_decl_nested_name_specifier_is_current_class) 4004 << SS.getRange(); 4005 return true; 4006 } 4007 4008 Diag(SS.getRange().getBegin(), 4009 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4010 << (NestedNameSpecifier*) SS.getScopeRep() 4011 << cast<CXXRecordDecl>(CurContext) 4012 << SS.getRange(); 4013 return true; 4014 } 4015 4016 return false; 4017 } 4018 4019 // C++03 [namespace.udecl]p4: 4020 // A using-declaration used as a member-declaration shall refer 4021 // to a member of a base class of the class being defined [etc.]. 4022 4023 // Salient point: SS doesn't have to name a base class as long as 4024 // lookup only finds members from base classes. Therefore we can 4025 // diagnose here only if we can prove that that can't happen, 4026 // i.e. if the class hierarchies provably don't intersect. 4027 4028 // TODO: it would be nice if "definitely valid" results were cached 4029 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4030 // need to be repeated. 4031 4032 struct UserData { 4033 llvm::DenseSet<const CXXRecordDecl*> Bases; 4034 4035 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4036 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4037 Data->Bases.insert(Base); 4038 return true; 4039 } 4040 4041 bool hasDependentBases(const CXXRecordDecl *Class) { 4042 return !Class->forallBases(collect, this); 4043 } 4044 4045 /// Returns true if the base is dependent or is one of the 4046 /// accumulated base classes. 4047 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4048 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4049 return !Data->Bases.count(Base); 4050 } 4051 4052 bool mightShareBases(const CXXRecordDecl *Class) { 4053 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4054 } 4055 }; 4056 4057 UserData Data; 4058 4059 // Returns false if we find a dependent base. 4060 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4061 return false; 4062 4063 // Returns false if the class has a dependent base or if it or one 4064 // of its bases is present in the base set of the current context. 4065 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4066 return false; 4067 4068 Diag(SS.getRange().getBegin(), 4069 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4070 << (NestedNameSpecifier*) SS.getScopeRep() 4071 << cast<CXXRecordDecl>(CurContext) 4072 << SS.getRange(); 4073 4074 return true; 4075} 4076 4077Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4078 SourceLocation NamespaceLoc, 4079 SourceLocation AliasLoc, 4080 IdentifierInfo *Alias, 4081 CXXScopeSpec &SS, 4082 SourceLocation IdentLoc, 4083 IdentifierInfo *Ident) { 4084 4085 // Lookup the namespace name. 4086 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4087 LookupParsedName(R, S, &SS); 4088 4089 // Check if we have a previous declaration with the same name. 4090 NamedDecl *PrevDecl 4091 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4092 ForRedeclaration); 4093 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4094 PrevDecl = 0; 4095 4096 if (PrevDecl) { 4097 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4098 // We already have an alias with the same name that points to the same 4099 // namespace, so don't create a new one. 4100 // FIXME: At some point, we'll want to create the (redundant) 4101 // declaration to maintain better source information. 4102 if (!R.isAmbiguous() && !R.empty() && 4103 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4104 return DeclPtrTy(); 4105 } 4106 4107 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4108 diag::err_redefinition_different_kind; 4109 Diag(AliasLoc, DiagID) << Alias; 4110 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4111 return DeclPtrTy(); 4112 } 4113 4114 if (R.isAmbiguous()) 4115 return DeclPtrTy(); 4116 4117 if (R.empty()) { 4118 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4119 return DeclPtrTy(); 4120 } 4121 4122 NamespaceAliasDecl *AliasDecl = 4123 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4124 Alias, SS.getRange(), 4125 (NestedNameSpecifier *)SS.getScopeRep(), 4126 IdentLoc, R.getFoundDecl()); 4127 4128 PushOnScopeChains(AliasDecl, S); 4129 return DeclPtrTy::make(AliasDecl); 4130} 4131 4132namespace { 4133 /// \brief Scoped object used to handle the state changes required in Sema 4134 /// to implicitly define the body of a C++ member function; 4135 class ImplicitlyDefinedFunctionScope { 4136 Sema &S; 4137 DeclContext *PreviousContext; 4138 4139 public: 4140 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4141 : S(S), PreviousContext(S.CurContext) 4142 { 4143 S.CurContext = Method; 4144 S.PushFunctionScope(); 4145 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4146 } 4147 4148 ~ImplicitlyDefinedFunctionScope() { 4149 S.PopExpressionEvaluationContext(); 4150 S.PopFunctionOrBlockScope(); 4151 S.CurContext = PreviousContext; 4152 } 4153 }; 4154} 4155 4156void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4157 CXXConstructorDecl *Constructor) { 4158 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4159 !Constructor->isUsed()) && 4160 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4161 4162 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4163 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4164 4165 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4166 ErrorTrap Trap(*this); 4167 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4168 Trap.hasErrorOccurred()) { 4169 Diag(CurrentLocation, diag::note_member_synthesized_at) 4170 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4171 Constructor->setInvalidDecl(); 4172 } else { 4173 Constructor->setUsed(); 4174 MarkVTableUsed(CurrentLocation, ClassDecl); 4175 } 4176} 4177 4178void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4179 CXXDestructorDecl *Destructor) { 4180 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4181 "DefineImplicitDestructor - call it for implicit default dtor"); 4182 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4183 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4184 4185 if (Destructor->isInvalidDecl()) 4186 return; 4187 4188 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4189 4190 ErrorTrap Trap(*this); 4191 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4192 Destructor->getParent()); 4193 4194 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4195 Diag(CurrentLocation, diag::note_member_synthesized_at) 4196 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4197 4198 Destructor->setInvalidDecl(); 4199 return; 4200 } 4201 4202 Destructor->setUsed(); 4203 MarkVTableUsed(CurrentLocation, ClassDecl); 4204} 4205 4206/// \brief Builds a statement that copies the given entity from \p From to 4207/// \c To. 4208/// 4209/// This routine is used to copy the members of a class with an 4210/// implicitly-declared copy assignment operator. When the entities being 4211/// copied are arrays, this routine builds for loops to copy them. 4212/// 4213/// \param S The Sema object used for type-checking. 4214/// 4215/// \param Loc The location where the implicit copy is being generated. 4216/// 4217/// \param T The type of the expressions being copied. Both expressions must 4218/// have this type. 4219/// 4220/// \param To The expression we are copying to. 4221/// 4222/// \param From The expression we are copying from. 4223/// 4224/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4225/// Otherwise, it's a non-static member subobject. 4226/// 4227/// \param Depth Internal parameter recording the depth of the recursion. 4228/// 4229/// \returns A statement or a loop that copies the expressions. 4230static Sema::OwningStmtResult 4231BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4232 Sema::OwningExprResult To, Sema::OwningExprResult From, 4233 bool CopyingBaseSubobject, unsigned Depth = 0) { 4234 typedef Sema::OwningStmtResult OwningStmtResult; 4235 typedef Sema::OwningExprResult OwningExprResult; 4236 4237 // C++0x [class.copy]p30: 4238 // Each subobject is assigned in the manner appropriate to its type: 4239 // 4240 // - if the subobject is of class type, the copy assignment operator 4241 // for the class is used (as if by explicit qualification; that is, 4242 // ignoring any possible virtual overriding functions in more derived 4243 // classes); 4244 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4245 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4246 4247 // Look for operator=. 4248 DeclarationName Name 4249 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4250 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4251 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4252 4253 // Filter out any result that isn't a copy-assignment operator. 4254 LookupResult::Filter F = OpLookup.makeFilter(); 4255 while (F.hasNext()) { 4256 NamedDecl *D = F.next(); 4257 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4258 if (Method->isCopyAssignmentOperator()) 4259 continue; 4260 4261 F.erase(); 4262 } 4263 F.done(); 4264 4265 // Suppress the protected check (C++ [class.protected]) for each of the 4266 // assignment operators we found. This strange dance is required when 4267 // we're assigning via a base classes's copy-assignment operator. To 4268 // ensure that we're getting the right base class subobject (without 4269 // ambiguities), we need to cast "this" to that subobject type; to 4270 // ensure that we don't go through the virtual call mechanism, we need 4271 // to qualify the operator= name with the base class (see below). However, 4272 // this means that if the base class has a protected copy assignment 4273 // operator, the protected member access check will fail. So, we 4274 // rewrite "protected" access to "public" access in this case, since we 4275 // know by construction that we're calling from a derived class. 4276 if (CopyingBaseSubobject) { 4277 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4278 L != LEnd; ++L) { 4279 if (L.getAccess() == AS_protected) 4280 L.setAccess(AS_public); 4281 } 4282 } 4283 4284 // Create the nested-name-specifier that will be used to qualify the 4285 // reference to operator=; this is required to suppress the virtual 4286 // call mechanism. 4287 CXXScopeSpec SS; 4288 SS.setRange(Loc); 4289 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4290 T.getTypePtr())); 4291 4292 // Create the reference to operator=. 4293 OwningExprResult OpEqualRef 4294 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4295 /*FirstQualifierInScope=*/0, OpLookup, 4296 /*TemplateArgs=*/0, 4297 /*SuppressQualifierCheck=*/true); 4298 if (OpEqualRef.isInvalid()) 4299 return S.StmtError(); 4300 4301 // Build the call to the assignment operator. 4302 Expr *FromE = From.takeAs<Expr>(); 4303 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4304 OpEqualRef.takeAs<Expr>(), 4305 Loc, &FromE, 1, 0, Loc); 4306 if (Call.isInvalid()) 4307 return S.StmtError(); 4308 4309 return S.Owned(Call.takeAs<Stmt>()); 4310 } 4311 4312 // - if the subobject is of scalar type, the built-in assignment 4313 // operator is used. 4314 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4315 if (!ArrayTy) { 4316 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4317 BinaryOperator::Assign, 4318 To.takeAs<Expr>(), 4319 From.takeAs<Expr>()); 4320 if (Assignment.isInvalid()) 4321 return S.StmtError(); 4322 4323 return S.Owned(Assignment.takeAs<Stmt>()); 4324 } 4325 4326 // - if the subobject is an array, each element is assigned, in the 4327 // manner appropriate to the element type; 4328 4329 // Construct a loop over the array bounds, e.g., 4330 // 4331 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4332 // 4333 // that will copy each of the array elements. 4334 QualType SizeType = S.Context.getSizeType(); 4335 4336 // Create the iteration variable. 4337 IdentifierInfo *IterationVarName = 0; 4338 { 4339 llvm::SmallString<8> Str; 4340 llvm::raw_svector_ostream OS(Str); 4341 OS << "__i" << Depth; 4342 IterationVarName = &S.Context.Idents.get(OS.str()); 4343 } 4344 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4345 IterationVarName, SizeType, 4346 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4347 VarDecl::None, VarDecl::None); 4348 4349 // Initialize the iteration variable to zero. 4350 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4351 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4352 4353 // Create a reference to the iteration variable; we'll use this several 4354 // times throughout. 4355 Expr *IterationVarRef 4356 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4357 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4358 4359 // Create the DeclStmt that holds the iteration variable. 4360 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4361 4362 // Create the comparison against the array bound. 4363 llvm::APInt Upper = ArrayTy->getSize(); 4364 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4365 OwningExprResult Comparison 4366 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4367 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4368 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4369 4370 // Create the pre-increment of the iteration variable. 4371 OwningExprResult Increment 4372 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4373 UnaryOperator::PreInc, 4374 SizeType, Loc)); 4375 4376 // Subscript the "from" and "to" expressions with the iteration variable. 4377 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4378 S.Owned(IterationVarRef->Retain()), 4379 Loc); 4380 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4381 S.Owned(IterationVarRef->Retain()), 4382 Loc); 4383 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4384 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4385 4386 // Build the copy for an individual element of the array. 4387 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4388 ArrayTy->getElementType(), 4389 move(To), move(From), 4390 CopyingBaseSubobject, Depth+1); 4391 if (Copy.isInvalid()) { 4392 InitStmt->Destroy(S.Context); 4393 return S.StmtError(); 4394 } 4395 4396 // Construct the loop that copies all elements of this array. 4397 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4398 S.MakeFullExpr(Comparison), 4399 Sema::DeclPtrTy(), 4400 S.MakeFullExpr(Increment), 4401 Loc, move(Copy)); 4402} 4403 4404void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4405 CXXMethodDecl *CopyAssignOperator) { 4406 assert((CopyAssignOperator->isImplicit() && 4407 CopyAssignOperator->isOverloadedOperator() && 4408 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4409 !CopyAssignOperator->isUsed()) && 4410 "DefineImplicitCopyAssignment called for wrong function"); 4411 4412 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4413 4414 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4415 CopyAssignOperator->setInvalidDecl(); 4416 return; 4417 } 4418 4419 CopyAssignOperator->setUsed(); 4420 4421 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4422 ErrorTrap Trap(*this); 4423 4424 // C++0x [class.copy]p30: 4425 // The implicitly-defined or explicitly-defaulted copy assignment operator 4426 // for a non-union class X performs memberwise copy assignment of its 4427 // subobjects. The direct base classes of X are assigned first, in the 4428 // order of their declaration in the base-specifier-list, and then the 4429 // immediate non-static data members of X are assigned, in the order in 4430 // which they were declared in the class definition. 4431 4432 // The statements that form the synthesized function body. 4433 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4434 4435 // The parameter for the "other" object, which we are copying from. 4436 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4437 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4438 QualType OtherRefType = Other->getType(); 4439 if (const LValueReferenceType *OtherRef 4440 = OtherRefType->getAs<LValueReferenceType>()) { 4441 OtherRefType = OtherRef->getPointeeType(); 4442 OtherQuals = OtherRefType.getQualifiers(); 4443 } 4444 4445 // Our location for everything implicitly-generated. 4446 SourceLocation Loc = CopyAssignOperator->getLocation(); 4447 4448 // Construct a reference to the "other" object. We'll be using this 4449 // throughout the generated ASTs. 4450 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4451 assert(OtherRef && "Reference to parameter cannot fail!"); 4452 4453 // Construct the "this" pointer. We'll be using this throughout the generated 4454 // ASTs. 4455 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4456 assert(This && "Reference to this cannot fail!"); 4457 4458 // Assign base classes. 4459 bool Invalid = false; 4460 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4461 E = ClassDecl->bases_end(); Base != E; ++Base) { 4462 // Form the assignment: 4463 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4464 QualType BaseType = Base->getType().getUnqualifiedType(); 4465 CXXRecordDecl *BaseClassDecl = 0; 4466 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4467 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4468 else { 4469 Invalid = true; 4470 continue; 4471 } 4472 4473 // Construct the "from" expression, which is an implicit cast to the 4474 // appropriately-qualified base type. 4475 Expr *From = OtherRef->Retain(); 4476 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4477 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4478 CXXBaseSpecifierArray(Base)); 4479 4480 // Dereference "this". 4481 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4482 Owned(This->Retain())); 4483 4484 // Implicitly cast "this" to the appropriately-qualified base type. 4485 Expr *ToE = To.takeAs<Expr>(); 4486 ImpCastExprToType(ToE, 4487 Context.getCVRQualifiedType(BaseType, 4488 CopyAssignOperator->getTypeQualifiers()), 4489 CastExpr::CK_UncheckedDerivedToBase, 4490 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4491 To = Owned(ToE); 4492 4493 // Build the copy. 4494 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4495 move(To), Owned(From), 4496 /*CopyingBaseSubobject=*/true); 4497 if (Copy.isInvalid()) { 4498 Diag(CurrentLocation, diag::note_member_synthesized_at) 4499 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4500 CopyAssignOperator->setInvalidDecl(); 4501 return; 4502 } 4503 4504 // Success! Record the copy. 4505 Statements.push_back(Copy.takeAs<Expr>()); 4506 } 4507 4508 // \brief Reference to the __builtin_memcpy function. 4509 Expr *BuiltinMemCpyRef = 0; 4510 4511 // Assign non-static members. 4512 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4513 FieldEnd = ClassDecl->field_end(); 4514 Field != FieldEnd; ++Field) { 4515 // Check for members of reference type; we can't copy those. 4516 if (Field->getType()->isReferenceType()) { 4517 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4518 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4519 Diag(Field->getLocation(), diag::note_declared_at); 4520 Diag(CurrentLocation, diag::note_member_synthesized_at) 4521 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4522 Invalid = true; 4523 continue; 4524 } 4525 4526 // Check for members of const-qualified, non-class type. 4527 QualType BaseType = Context.getBaseElementType(Field->getType()); 4528 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4529 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4530 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4531 Diag(Field->getLocation(), diag::note_declared_at); 4532 Diag(CurrentLocation, diag::note_member_synthesized_at) 4533 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4534 Invalid = true; 4535 continue; 4536 } 4537 4538 QualType FieldType = Field->getType().getNonReferenceType(); 4539 4540 // Build references to the field in the object we're copying from and to. 4541 CXXScopeSpec SS; // Intentionally empty 4542 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4543 LookupMemberName); 4544 MemberLookup.addDecl(*Field); 4545 MemberLookup.resolveKind(); 4546 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4547 OtherRefType, 4548 Loc, /*IsArrow=*/false, 4549 SS, 0, MemberLookup, 0); 4550 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4551 This->getType(), 4552 Loc, /*IsArrow=*/true, 4553 SS, 0, MemberLookup, 0); 4554 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4555 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4556 4557 // If the field should be copied with __builtin_memcpy rather than via 4558 // explicit assignments, do so. This optimization only applies for arrays 4559 // of scalars and arrays of class type with trivial copy-assignment 4560 // operators. 4561 if (FieldType->isArrayType() && 4562 (!BaseType->isRecordType() || 4563 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4564 ->hasTrivialCopyAssignment())) { 4565 // Compute the size of the memory buffer to be copied. 4566 QualType SizeType = Context.getSizeType(); 4567 llvm::APInt Size(Context.getTypeSize(SizeType), 4568 Context.getTypeSizeInChars(BaseType).getQuantity()); 4569 for (const ConstantArrayType *Array 4570 = Context.getAsConstantArrayType(FieldType); 4571 Array; 4572 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4573 llvm::APInt ArraySize = Array->getSize(); 4574 ArraySize.zextOrTrunc(Size.getBitWidth()); 4575 Size *= ArraySize; 4576 } 4577 4578 // Take the address of the field references for "from" and "to". 4579 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4580 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4581 4582 // Create a reference to the __builtin_memcpy builtin function. 4583 if (!BuiltinMemCpyRef) { 4584 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4585 LookupOrdinaryName); 4586 LookupName(R, TUScope, true); 4587 4588 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4589 if (!BuiltinMemCpy) { 4590 // Something went horribly wrong earlier, and we will have complained 4591 // about it. 4592 Invalid = true; 4593 continue; 4594 } 4595 4596 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4597 BuiltinMemCpy->getType(), 4598 Loc, 0).takeAs<Expr>(); 4599 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4600 } 4601 4602 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4603 CallArgs.push_back(To.takeAs<Expr>()); 4604 CallArgs.push_back(From.takeAs<Expr>()); 4605 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4606 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4607 Commas.push_back(Loc); 4608 Commas.push_back(Loc); 4609 OwningExprResult Call = ActOnCallExpr(/*Scope=*/0, 4610 Owned(BuiltinMemCpyRef->Retain()), 4611 Loc, move_arg(CallArgs), 4612 Commas.data(), Loc); 4613 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4614 Statements.push_back(Call.takeAs<Expr>()); 4615 continue; 4616 } 4617 4618 // Build the copy of this field. 4619 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4620 move(To), move(From), 4621 /*CopyingBaseSubobject=*/false); 4622 if (Copy.isInvalid()) { 4623 Diag(CurrentLocation, diag::note_member_synthesized_at) 4624 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4625 CopyAssignOperator->setInvalidDecl(); 4626 return; 4627 } 4628 4629 // Success! Record the copy. 4630 Statements.push_back(Copy.takeAs<Stmt>()); 4631 } 4632 4633 if (!Invalid) { 4634 // Add a "return *this;" 4635 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4636 Owned(This->Retain())); 4637 4638 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4639 if (Return.isInvalid()) 4640 Invalid = true; 4641 else { 4642 Statements.push_back(Return.takeAs<Stmt>()); 4643 4644 if (Trap.hasErrorOccurred()) { 4645 Diag(CurrentLocation, diag::note_member_synthesized_at) 4646 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4647 Invalid = true; 4648 } 4649 } 4650 } 4651 4652 if (Invalid) { 4653 CopyAssignOperator->setInvalidDecl(); 4654 return; 4655 } 4656 4657 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4658 /*isStmtExpr=*/false); 4659 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4660 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4661} 4662 4663void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4664 CXXConstructorDecl *CopyConstructor, 4665 unsigned TypeQuals) { 4666 assert((CopyConstructor->isImplicit() && 4667 CopyConstructor->isCopyConstructor(TypeQuals) && 4668 !CopyConstructor->isUsed()) && 4669 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4670 4671 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4672 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4673 4674 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4675 ErrorTrap Trap(*this); 4676 4677 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4678 Trap.hasErrorOccurred()) { 4679 Diag(CurrentLocation, diag::note_member_synthesized_at) 4680 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4681 CopyConstructor->setInvalidDecl(); 4682 } else { 4683 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4684 CopyConstructor->getLocation(), 4685 MultiStmtArg(*this, 0, 0), 4686 /*isStmtExpr=*/false) 4687 .takeAs<Stmt>()); 4688 } 4689 4690 CopyConstructor->setUsed(); 4691} 4692 4693Sema::OwningExprResult 4694Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4695 CXXConstructorDecl *Constructor, 4696 MultiExprArg ExprArgs, 4697 bool RequiresZeroInit, 4698 CXXConstructExpr::ConstructionKind ConstructKind) { 4699 bool Elidable = false; 4700 4701 // C++0x [class.copy]p34: 4702 // When certain criteria are met, an implementation is allowed to 4703 // omit the copy/move construction of a class object, even if the 4704 // copy/move constructor and/or destructor for the object have 4705 // side effects. [...] 4706 // - when a temporary class object that has not been bound to a 4707 // reference (12.2) would be copied/moved to a class object 4708 // with the same cv-unqualified type, the copy/move operation 4709 // can be omitted by constructing the temporary object 4710 // directly into the target of the omitted copy/move 4711 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4712 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4713 Elidable = SubExpr->isTemporaryObject() && 4714 Context.hasSameUnqualifiedType(SubExpr->getType(), 4715 Context.getTypeDeclType(Constructor->getParent())); 4716 } 4717 4718 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4719 Elidable, move(ExprArgs), RequiresZeroInit, 4720 ConstructKind); 4721} 4722 4723/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4724/// including handling of its default argument expressions. 4725Sema::OwningExprResult 4726Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4727 CXXConstructorDecl *Constructor, bool Elidable, 4728 MultiExprArg ExprArgs, 4729 bool RequiresZeroInit, 4730 CXXConstructExpr::ConstructionKind ConstructKind) { 4731 unsigned NumExprs = ExprArgs.size(); 4732 Expr **Exprs = (Expr **)ExprArgs.release(); 4733 4734 MarkDeclarationReferenced(ConstructLoc, Constructor); 4735 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4736 Constructor, Elidable, Exprs, NumExprs, 4737 RequiresZeroInit, ConstructKind)); 4738} 4739 4740bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4741 CXXConstructorDecl *Constructor, 4742 MultiExprArg Exprs) { 4743 OwningExprResult TempResult = 4744 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4745 move(Exprs)); 4746 if (TempResult.isInvalid()) 4747 return true; 4748 4749 Expr *Temp = TempResult.takeAs<Expr>(); 4750 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4751 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4752 VD->setInit(Temp); 4753 4754 return false; 4755} 4756 4757void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4758 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4759 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4760 !ClassDecl->hasTrivialDestructor()) { 4761 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4762 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4763 CheckDestructorAccess(VD->getLocation(), Destructor, 4764 PDiag(diag::err_access_dtor_var) 4765 << VD->getDeclName() 4766 << VD->getType()); 4767 } 4768} 4769 4770/// AddCXXDirectInitializerToDecl - This action is called immediately after 4771/// ActOnDeclarator, when a C++ direct initializer is present. 4772/// e.g: "int x(1);" 4773void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4774 SourceLocation LParenLoc, 4775 MultiExprArg Exprs, 4776 SourceLocation *CommaLocs, 4777 SourceLocation RParenLoc) { 4778 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4779 Decl *RealDecl = Dcl.getAs<Decl>(); 4780 4781 // If there is no declaration, there was an error parsing it. Just ignore 4782 // the initializer. 4783 if (RealDecl == 0) 4784 return; 4785 4786 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4787 if (!VDecl) { 4788 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4789 RealDecl->setInvalidDecl(); 4790 return; 4791 } 4792 4793 // We will represent direct-initialization similarly to copy-initialization: 4794 // int x(1); -as-> int x = 1; 4795 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4796 // 4797 // Clients that want to distinguish between the two forms, can check for 4798 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4799 // A major benefit is that clients that don't particularly care about which 4800 // exactly form was it (like the CodeGen) can handle both cases without 4801 // special case code. 4802 4803 // C++ 8.5p11: 4804 // The form of initialization (using parentheses or '=') is generally 4805 // insignificant, but does matter when the entity being initialized has a 4806 // class type. 4807 QualType DeclInitType = VDecl->getType(); 4808 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4809 DeclInitType = Context.getBaseElementType(Array); 4810 4811 if (!VDecl->getType()->isDependentType() && 4812 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4813 diag::err_typecheck_decl_incomplete_type)) { 4814 VDecl->setInvalidDecl(); 4815 return; 4816 } 4817 4818 // The variable can not have an abstract class type. 4819 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4820 diag::err_abstract_type_in_decl, 4821 AbstractVariableType)) 4822 VDecl->setInvalidDecl(); 4823 4824 const VarDecl *Def; 4825 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4826 Diag(VDecl->getLocation(), diag::err_redefinition) 4827 << VDecl->getDeclName(); 4828 Diag(Def->getLocation(), diag::note_previous_definition); 4829 VDecl->setInvalidDecl(); 4830 return; 4831 } 4832 4833 // If either the declaration has a dependent type or if any of the 4834 // expressions is type-dependent, we represent the initialization 4835 // via a ParenListExpr for later use during template instantiation. 4836 if (VDecl->getType()->isDependentType() || 4837 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4838 // Let clients know that initialization was done with a direct initializer. 4839 VDecl->setCXXDirectInitializer(true); 4840 4841 // Store the initialization expressions as a ParenListExpr. 4842 unsigned NumExprs = Exprs.size(); 4843 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4844 (Expr **)Exprs.release(), 4845 NumExprs, RParenLoc)); 4846 return; 4847 } 4848 4849 // Capture the variable that is being initialized and the style of 4850 // initialization. 4851 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4852 4853 // FIXME: Poor source location information. 4854 InitializationKind Kind 4855 = InitializationKind::CreateDirect(VDecl->getLocation(), 4856 LParenLoc, RParenLoc); 4857 4858 InitializationSequence InitSeq(*this, Entity, Kind, 4859 (Expr**)Exprs.get(), Exprs.size()); 4860 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4861 if (Result.isInvalid()) { 4862 VDecl->setInvalidDecl(); 4863 return; 4864 } 4865 4866 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4867 VDecl->setInit(Result.takeAs<Expr>()); 4868 VDecl->setCXXDirectInitializer(true); 4869 4870 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4871 FinalizeVarWithDestructor(VDecl, Record); 4872} 4873 4874/// \brief Given a constructor and the set of arguments provided for the 4875/// constructor, convert the arguments and add any required default arguments 4876/// to form a proper call to this constructor. 4877/// 4878/// \returns true if an error occurred, false otherwise. 4879bool 4880Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4881 MultiExprArg ArgsPtr, 4882 SourceLocation Loc, 4883 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4884 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4885 unsigned NumArgs = ArgsPtr.size(); 4886 Expr **Args = (Expr **)ArgsPtr.get(); 4887 4888 const FunctionProtoType *Proto 4889 = Constructor->getType()->getAs<FunctionProtoType>(); 4890 assert(Proto && "Constructor without a prototype?"); 4891 unsigned NumArgsInProto = Proto->getNumArgs(); 4892 4893 // If too few arguments are available, we'll fill in the rest with defaults. 4894 if (NumArgs < NumArgsInProto) 4895 ConvertedArgs.reserve(NumArgsInProto); 4896 else 4897 ConvertedArgs.reserve(NumArgs); 4898 4899 VariadicCallType CallType = 4900 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4901 llvm::SmallVector<Expr *, 8> AllArgs; 4902 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4903 Proto, 0, Args, NumArgs, AllArgs, 4904 CallType); 4905 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4906 ConvertedArgs.push_back(AllArgs[i]); 4907 return Invalid; 4908} 4909 4910static inline bool 4911CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4912 const FunctionDecl *FnDecl) { 4913 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4914 if (isa<NamespaceDecl>(DC)) { 4915 return SemaRef.Diag(FnDecl->getLocation(), 4916 diag::err_operator_new_delete_declared_in_namespace) 4917 << FnDecl->getDeclName(); 4918 } 4919 4920 if (isa<TranslationUnitDecl>(DC) && 4921 FnDecl->getStorageClass() == FunctionDecl::Static) { 4922 return SemaRef.Diag(FnDecl->getLocation(), 4923 diag::err_operator_new_delete_declared_static) 4924 << FnDecl->getDeclName(); 4925 } 4926 4927 return false; 4928} 4929 4930static inline bool 4931CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4932 CanQualType ExpectedResultType, 4933 CanQualType ExpectedFirstParamType, 4934 unsigned DependentParamTypeDiag, 4935 unsigned InvalidParamTypeDiag) { 4936 QualType ResultType = 4937 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4938 4939 // Check that the result type is not dependent. 4940 if (ResultType->isDependentType()) 4941 return SemaRef.Diag(FnDecl->getLocation(), 4942 diag::err_operator_new_delete_dependent_result_type) 4943 << FnDecl->getDeclName() << ExpectedResultType; 4944 4945 // Check that the result type is what we expect. 4946 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4947 return SemaRef.Diag(FnDecl->getLocation(), 4948 diag::err_operator_new_delete_invalid_result_type) 4949 << FnDecl->getDeclName() << ExpectedResultType; 4950 4951 // A function template must have at least 2 parameters. 4952 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4953 return SemaRef.Diag(FnDecl->getLocation(), 4954 diag::err_operator_new_delete_template_too_few_parameters) 4955 << FnDecl->getDeclName(); 4956 4957 // The function decl must have at least 1 parameter. 4958 if (FnDecl->getNumParams() == 0) 4959 return SemaRef.Diag(FnDecl->getLocation(), 4960 diag::err_operator_new_delete_too_few_parameters) 4961 << FnDecl->getDeclName(); 4962 4963 // Check the the first parameter type is not dependent. 4964 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4965 if (FirstParamType->isDependentType()) 4966 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4967 << FnDecl->getDeclName() << ExpectedFirstParamType; 4968 4969 // Check that the first parameter type is what we expect. 4970 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4971 ExpectedFirstParamType) 4972 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4973 << FnDecl->getDeclName() << ExpectedFirstParamType; 4974 4975 return false; 4976} 4977 4978static bool 4979CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4980 // C++ [basic.stc.dynamic.allocation]p1: 4981 // A program is ill-formed if an allocation function is declared in a 4982 // namespace scope other than global scope or declared static in global 4983 // scope. 4984 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4985 return true; 4986 4987 CanQualType SizeTy = 4988 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4989 4990 // C++ [basic.stc.dynamic.allocation]p1: 4991 // The return type shall be void*. The first parameter shall have type 4992 // std::size_t. 4993 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4994 SizeTy, 4995 diag::err_operator_new_dependent_param_type, 4996 diag::err_operator_new_param_type)) 4997 return true; 4998 4999 // C++ [basic.stc.dynamic.allocation]p1: 5000 // The first parameter shall not have an associated default argument. 5001 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5002 return SemaRef.Diag(FnDecl->getLocation(), 5003 diag::err_operator_new_default_arg) 5004 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5005 5006 return false; 5007} 5008 5009static bool 5010CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5011 // C++ [basic.stc.dynamic.deallocation]p1: 5012 // A program is ill-formed if deallocation functions are declared in a 5013 // namespace scope other than global scope or declared static in global 5014 // scope. 5015 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5016 return true; 5017 5018 // C++ [basic.stc.dynamic.deallocation]p2: 5019 // Each deallocation function shall return void and its first parameter 5020 // shall be void*. 5021 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5022 SemaRef.Context.VoidPtrTy, 5023 diag::err_operator_delete_dependent_param_type, 5024 diag::err_operator_delete_param_type)) 5025 return true; 5026 5027 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5028 if (FirstParamType->isDependentType()) 5029 return SemaRef.Diag(FnDecl->getLocation(), 5030 diag::err_operator_delete_dependent_param_type) 5031 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5032 5033 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5034 SemaRef.Context.VoidPtrTy) 5035 return SemaRef.Diag(FnDecl->getLocation(), 5036 diag::err_operator_delete_param_type) 5037 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5038 5039 return false; 5040} 5041 5042/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5043/// of this overloaded operator is well-formed. If so, returns false; 5044/// otherwise, emits appropriate diagnostics and returns true. 5045bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5046 assert(FnDecl && FnDecl->isOverloadedOperator() && 5047 "Expected an overloaded operator declaration"); 5048 5049 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5050 5051 // C++ [over.oper]p5: 5052 // The allocation and deallocation functions, operator new, 5053 // operator new[], operator delete and operator delete[], are 5054 // described completely in 3.7.3. The attributes and restrictions 5055 // found in the rest of this subclause do not apply to them unless 5056 // explicitly stated in 3.7.3. 5057 if (Op == OO_Delete || Op == OO_Array_Delete) 5058 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5059 5060 if (Op == OO_New || Op == OO_Array_New) 5061 return CheckOperatorNewDeclaration(*this, FnDecl); 5062 5063 // C++ [over.oper]p6: 5064 // An operator function shall either be a non-static member 5065 // function or be a non-member function and have at least one 5066 // parameter whose type is a class, a reference to a class, an 5067 // enumeration, or a reference to an enumeration. 5068 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5069 if (MethodDecl->isStatic()) 5070 return Diag(FnDecl->getLocation(), 5071 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5072 } else { 5073 bool ClassOrEnumParam = false; 5074 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5075 ParamEnd = FnDecl->param_end(); 5076 Param != ParamEnd; ++Param) { 5077 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5078 if (ParamType->isDependentType() || ParamType->isRecordType() || 5079 ParamType->isEnumeralType()) { 5080 ClassOrEnumParam = true; 5081 break; 5082 } 5083 } 5084 5085 if (!ClassOrEnumParam) 5086 return Diag(FnDecl->getLocation(), 5087 diag::err_operator_overload_needs_class_or_enum) 5088 << FnDecl->getDeclName(); 5089 } 5090 5091 // C++ [over.oper]p8: 5092 // An operator function cannot have default arguments (8.3.6), 5093 // except where explicitly stated below. 5094 // 5095 // Only the function-call operator allows default arguments 5096 // (C++ [over.call]p1). 5097 if (Op != OO_Call) { 5098 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5099 Param != FnDecl->param_end(); ++Param) { 5100 if ((*Param)->hasDefaultArg()) 5101 return Diag((*Param)->getLocation(), 5102 diag::err_operator_overload_default_arg) 5103 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5104 } 5105 } 5106 5107 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5108 { false, false, false } 5109#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5110 , { Unary, Binary, MemberOnly } 5111#include "clang/Basic/OperatorKinds.def" 5112 }; 5113 5114 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5115 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5116 bool MustBeMemberOperator = OperatorUses[Op][2]; 5117 5118 // C++ [over.oper]p8: 5119 // [...] Operator functions cannot have more or fewer parameters 5120 // than the number required for the corresponding operator, as 5121 // described in the rest of this subclause. 5122 unsigned NumParams = FnDecl->getNumParams() 5123 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5124 if (Op != OO_Call && 5125 ((NumParams == 1 && !CanBeUnaryOperator) || 5126 (NumParams == 2 && !CanBeBinaryOperator) || 5127 (NumParams < 1) || (NumParams > 2))) { 5128 // We have the wrong number of parameters. 5129 unsigned ErrorKind; 5130 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5131 ErrorKind = 2; // 2 -> unary or binary. 5132 } else if (CanBeUnaryOperator) { 5133 ErrorKind = 0; // 0 -> unary 5134 } else { 5135 assert(CanBeBinaryOperator && 5136 "All non-call overloaded operators are unary or binary!"); 5137 ErrorKind = 1; // 1 -> binary 5138 } 5139 5140 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5141 << FnDecl->getDeclName() << NumParams << ErrorKind; 5142 } 5143 5144 // Overloaded operators other than operator() cannot be variadic. 5145 if (Op != OO_Call && 5146 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5147 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5148 << FnDecl->getDeclName(); 5149 } 5150 5151 // Some operators must be non-static member functions. 5152 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5153 return Diag(FnDecl->getLocation(), 5154 diag::err_operator_overload_must_be_member) 5155 << FnDecl->getDeclName(); 5156 } 5157 5158 // C++ [over.inc]p1: 5159 // The user-defined function called operator++ implements the 5160 // prefix and postfix ++ operator. If this function is a member 5161 // function with no parameters, or a non-member function with one 5162 // parameter of class or enumeration type, it defines the prefix 5163 // increment operator ++ for objects of that type. If the function 5164 // is a member function with one parameter (which shall be of type 5165 // int) or a non-member function with two parameters (the second 5166 // of which shall be of type int), it defines the postfix 5167 // increment operator ++ for objects of that type. 5168 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5169 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5170 bool ParamIsInt = false; 5171 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5172 ParamIsInt = BT->getKind() == BuiltinType::Int; 5173 5174 if (!ParamIsInt) 5175 return Diag(LastParam->getLocation(), 5176 diag::err_operator_overload_post_incdec_must_be_int) 5177 << LastParam->getType() << (Op == OO_MinusMinus); 5178 } 5179 5180 // Notify the class if it got an assignment operator. 5181 if (Op == OO_Equal) { 5182 // Would have returned earlier otherwise. 5183 assert(isa<CXXMethodDecl>(FnDecl) && 5184 "Overloaded = not member, but not filtered."); 5185 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5186 Method->getParent()->addedAssignmentOperator(Context, Method); 5187 } 5188 5189 return false; 5190} 5191 5192/// CheckLiteralOperatorDeclaration - Check whether the declaration 5193/// of this literal operator function is well-formed. If so, returns 5194/// false; otherwise, emits appropriate diagnostics and returns true. 5195bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5196 DeclContext *DC = FnDecl->getDeclContext(); 5197 Decl::Kind Kind = DC->getDeclKind(); 5198 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5199 Kind != Decl::LinkageSpec) { 5200 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5201 << FnDecl->getDeclName(); 5202 return true; 5203 } 5204 5205 bool Valid = false; 5206 5207 // template <char...> type operator "" name() is the only valid template 5208 // signature, and the only valid signature with no parameters. 5209 if (FnDecl->param_size() == 0) { 5210 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5211 // Must have only one template parameter 5212 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5213 if (Params->size() == 1) { 5214 NonTypeTemplateParmDecl *PmDecl = 5215 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5216 5217 // The template parameter must be a char parameter pack. 5218 // FIXME: This test will always fail because non-type parameter packs 5219 // have not been implemented. 5220 if (PmDecl && PmDecl->isTemplateParameterPack() && 5221 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5222 Valid = true; 5223 } 5224 } 5225 } else { 5226 // Check the first parameter 5227 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5228 5229 QualType T = (*Param)->getType(); 5230 5231 // unsigned long long int, long double, and any character type are allowed 5232 // as the only parameters. 5233 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5234 Context.hasSameType(T, Context.LongDoubleTy) || 5235 Context.hasSameType(T, Context.CharTy) || 5236 Context.hasSameType(T, Context.WCharTy) || 5237 Context.hasSameType(T, Context.Char16Ty) || 5238 Context.hasSameType(T, Context.Char32Ty)) { 5239 if (++Param == FnDecl->param_end()) 5240 Valid = true; 5241 goto FinishedParams; 5242 } 5243 5244 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5245 const PointerType *PT = T->getAs<PointerType>(); 5246 if (!PT) 5247 goto FinishedParams; 5248 T = PT->getPointeeType(); 5249 if (!T.isConstQualified()) 5250 goto FinishedParams; 5251 T = T.getUnqualifiedType(); 5252 5253 // Move on to the second parameter; 5254 ++Param; 5255 5256 // If there is no second parameter, the first must be a const char * 5257 if (Param == FnDecl->param_end()) { 5258 if (Context.hasSameType(T, Context.CharTy)) 5259 Valid = true; 5260 goto FinishedParams; 5261 } 5262 5263 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5264 // are allowed as the first parameter to a two-parameter function 5265 if (!(Context.hasSameType(T, Context.CharTy) || 5266 Context.hasSameType(T, Context.WCharTy) || 5267 Context.hasSameType(T, Context.Char16Ty) || 5268 Context.hasSameType(T, Context.Char32Ty))) 5269 goto FinishedParams; 5270 5271 // The second and final parameter must be an std::size_t 5272 T = (*Param)->getType().getUnqualifiedType(); 5273 if (Context.hasSameType(T, Context.getSizeType()) && 5274 ++Param == FnDecl->param_end()) 5275 Valid = true; 5276 } 5277 5278 // FIXME: This diagnostic is absolutely terrible. 5279FinishedParams: 5280 if (!Valid) { 5281 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5282 << FnDecl->getDeclName(); 5283 return true; 5284 } 5285 5286 return false; 5287} 5288 5289/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5290/// linkage specification, including the language and (if present) 5291/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5292/// the location of the language string literal, which is provided 5293/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5294/// the '{' brace. Otherwise, this linkage specification does not 5295/// have any braces. 5296Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5297 SourceLocation ExternLoc, 5298 SourceLocation LangLoc, 5299 llvm::StringRef Lang, 5300 SourceLocation LBraceLoc) { 5301 LinkageSpecDecl::LanguageIDs Language; 5302 if (Lang == "\"C\"") 5303 Language = LinkageSpecDecl::lang_c; 5304 else if (Lang == "\"C++\"") 5305 Language = LinkageSpecDecl::lang_cxx; 5306 else { 5307 Diag(LangLoc, diag::err_bad_language); 5308 return DeclPtrTy(); 5309 } 5310 5311 // FIXME: Add all the various semantics of linkage specifications 5312 5313 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5314 LangLoc, Language, 5315 LBraceLoc.isValid()); 5316 CurContext->addDecl(D); 5317 PushDeclContext(S, D); 5318 return DeclPtrTy::make(D); 5319} 5320 5321/// ActOnFinishLinkageSpecification - Completely the definition of 5322/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5323/// valid, it's the position of the closing '}' brace in a linkage 5324/// specification that uses braces. 5325Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5326 DeclPtrTy LinkageSpec, 5327 SourceLocation RBraceLoc) { 5328 if (LinkageSpec) 5329 PopDeclContext(); 5330 return LinkageSpec; 5331} 5332 5333/// \brief Perform semantic analysis for the variable declaration that 5334/// occurs within a C++ catch clause, returning the newly-created 5335/// variable. 5336VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5337 TypeSourceInfo *TInfo, 5338 IdentifierInfo *Name, 5339 SourceLocation Loc, 5340 SourceRange Range) { 5341 bool Invalid = false; 5342 5343 // Arrays and functions decay. 5344 if (ExDeclType->isArrayType()) 5345 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5346 else if (ExDeclType->isFunctionType()) 5347 ExDeclType = Context.getPointerType(ExDeclType); 5348 5349 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5350 // The exception-declaration shall not denote a pointer or reference to an 5351 // incomplete type, other than [cv] void*. 5352 // N2844 forbids rvalue references. 5353 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5354 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5355 Invalid = true; 5356 } 5357 5358 // GCC allows catching pointers and references to incomplete types 5359 // as an extension; so do we, but we warn by default. 5360 5361 QualType BaseType = ExDeclType; 5362 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5363 unsigned DK = diag::err_catch_incomplete; 5364 bool IncompleteCatchIsInvalid = true; 5365 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5366 BaseType = Ptr->getPointeeType(); 5367 Mode = 1; 5368 DK = diag::ext_catch_incomplete_ptr; 5369 IncompleteCatchIsInvalid = false; 5370 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5371 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5372 BaseType = Ref->getPointeeType(); 5373 Mode = 2; 5374 DK = diag::ext_catch_incomplete_ref; 5375 IncompleteCatchIsInvalid = false; 5376 } 5377 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5378 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5379 IncompleteCatchIsInvalid) 5380 Invalid = true; 5381 5382 if (!Invalid && !ExDeclType->isDependentType() && 5383 RequireNonAbstractType(Loc, ExDeclType, 5384 diag::err_abstract_type_in_decl, 5385 AbstractVariableType)) 5386 Invalid = true; 5387 5388 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5389 Name, ExDeclType, TInfo, VarDecl::None, 5390 VarDecl::None); 5391 ExDecl->setExceptionVariable(true); 5392 5393 if (!Invalid) { 5394 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5395 // C++ [except.handle]p16: 5396 // The object declared in an exception-declaration or, if the 5397 // exception-declaration does not specify a name, a temporary (12.2) is 5398 // copy-initialized (8.5) from the exception object. [...] 5399 // The object is destroyed when the handler exits, after the destruction 5400 // of any automatic objects initialized within the handler. 5401 // 5402 // We just pretend to initialize the object with itself, then make sure 5403 // it can be destroyed later. 5404 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5405 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5406 Loc, ExDeclType, 0); 5407 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5408 SourceLocation()); 5409 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5410 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5411 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5412 if (Result.isInvalid()) 5413 Invalid = true; 5414 else 5415 FinalizeVarWithDestructor(ExDecl, RecordTy); 5416 } 5417 } 5418 5419 if (Invalid) 5420 ExDecl->setInvalidDecl(); 5421 5422 return ExDecl; 5423} 5424 5425/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5426/// handler. 5427Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5428 TypeSourceInfo *TInfo = 0; 5429 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5430 5431 bool Invalid = D.isInvalidType(); 5432 IdentifierInfo *II = D.getIdentifier(); 5433 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5434 LookupOrdinaryName, 5435 ForRedeclaration)) { 5436 // The scope should be freshly made just for us. There is just no way 5437 // it contains any previous declaration. 5438 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5439 if (PrevDecl->isTemplateParameter()) { 5440 // Maybe we will complain about the shadowed template parameter. 5441 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5442 } 5443 } 5444 5445 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5446 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5447 << D.getCXXScopeSpec().getRange(); 5448 Invalid = true; 5449 } 5450 5451 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5452 D.getIdentifier(), 5453 D.getIdentifierLoc(), 5454 D.getDeclSpec().getSourceRange()); 5455 5456 if (Invalid) 5457 ExDecl->setInvalidDecl(); 5458 5459 // Add the exception declaration into this scope. 5460 if (II) 5461 PushOnScopeChains(ExDecl, S); 5462 else 5463 CurContext->addDecl(ExDecl); 5464 5465 ProcessDeclAttributes(S, ExDecl, D); 5466 return DeclPtrTy::make(ExDecl); 5467} 5468 5469Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5470 ExprArg assertexpr, 5471 ExprArg assertmessageexpr) { 5472 Expr *AssertExpr = (Expr *)assertexpr.get(); 5473 StringLiteral *AssertMessage = 5474 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5475 5476 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5477 llvm::APSInt Value(32); 5478 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5479 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5480 AssertExpr->getSourceRange(); 5481 return DeclPtrTy(); 5482 } 5483 5484 if (Value == 0) { 5485 Diag(AssertLoc, diag::err_static_assert_failed) 5486 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5487 } 5488 } 5489 5490 assertexpr.release(); 5491 assertmessageexpr.release(); 5492 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5493 AssertExpr, AssertMessage); 5494 5495 CurContext->addDecl(Decl); 5496 return DeclPtrTy::make(Decl); 5497} 5498 5499/// \brief Perform semantic analysis of the given friend type declaration. 5500/// 5501/// \returns A friend declaration that. 5502FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5503 TypeSourceInfo *TSInfo) { 5504 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5505 5506 QualType T = TSInfo->getType(); 5507 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5508 5509 if (!getLangOptions().CPlusPlus0x) { 5510 // C++03 [class.friend]p2: 5511 // An elaborated-type-specifier shall be used in a friend declaration 5512 // for a class.* 5513 // 5514 // * The class-key of the elaborated-type-specifier is required. 5515 if (!ActiveTemplateInstantiations.empty()) { 5516 // Do not complain about the form of friend template types during 5517 // template instantiation; we will already have complained when the 5518 // template was declared. 5519 } else if (!T->isElaboratedTypeSpecifier()) { 5520 // If we evaluated the type to a record type, suggest putting 5521 // a tag in front. 5522 if (const RecordType *RT = T->getAs<RecordType>()) { 5523 RecordDecl *RD = RT->getDecl(); 5524 5525 std::string InsertionText = std::string(" ") + RD->getKindName(); 5526 5527 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5528 << (unsigned) RD->getTagKind() 5529 << T 5530 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5531 InsertionText); 5532 } else { 5533 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5534 << T 5535 << SourceRange(FriendLoc, TypeRange.getEnd()); 5536 } 5537 } else if (T->getAs<EnumType>()) { 5538 Diag(FriendLoc, diag::ext_enum_friend) 5539 << T 5540 << SourceRange(FriendLoc, TypeRange.getEnd()); 5541 } 5542 } 5543 5544 // C++0x [class.friend]p3: 5545 // If the type specifier in a friend declaration designates a (possibly 5546 // cv-qualified) class type, that class is declared as a friend; otherwise, 5547 // the friend declaration is ignored. 5548 5549 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5550 // in [class.friend]p3 that we do not implement. 5551 5552 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5553} 5554 5555/// Handle a friend type declaration. This works in tandem with 5556/// ActOnTag. 5557/// 5558/// Notes on friend class templates: 5559/// 5560/// We generally treat friend class declarations as if they were 5561/// declaring a class. So, for example, the elaborated type specifier 5562/// in a friend declaration is required to obey the restrictions of a 5563/// class-head (i.e. no typedefs in the scope chain), template 5564/// parameters are required to match up with simple template-ids, &c. 5565/// However, unlike when declaring a template specialization, it's 5566/// okay to refer to a template specialization without an empty 5567/// template parameter declaration, e.g. 5568/// friend class A<T>::B<unsigned>; 5569/// We permit this as a special case; if there are any template 5570/// parameters present at all, require proper matching, i.e. 5571/// template <> template <class T> friend class A<int>::B; 5572Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5573 MultiTemplateParamsArg TempParams) { 5574 SourceLocation Loc = DS.getSourceRange().getBegin(); 5575 5576 assert(DS.isFriendSpecified()); 5577 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5578 5579 // Try to convert the decl specifier to a type. This works for 5580 // friend templates because ActOnTag never produces a ClassTemplateDecl 5581 // for a TUK_Friend. 5582 Declarator TheDeclarator(DS, Declarator::MemberContext); 5583 TypeSourceInfo *TSI; 5584 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5585 if (TheDeclarator.isInvalidType()) 5586 return DeclPtrTy(); 5587 5588 if (!TSI) 5589 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5590 5591 // This is definitely an error in C++98. It's probably meant to 5592 // be forbidden in C++0x, too, but the specification is just 5593 // poorly written. 5594 // 5595 // The problem is with declarations like the following: 5596 // template <T> friend A<T>::foo; 5597 // where deciding whether a class C is a friend or not now hinges 5598 // on whether there exists an instantiation of A that causes 5599 // 'foo' to equal C. There are restrictions on class-heads 5600 // (which we declare (by fiat) elaborated friend declarations to 5601 // be) that makes this tractable. 5602 // 5603 // FIXME: handle "template <> friend class A<T>;", which 5604 // is possibly well-formed? Who even knows? 5605 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5606 Diag(Loc, diag::err_tagless_friend_type_template) 5607 << DS.getSourceRange(); 5608 return DeclPtrTy(); 5609 } 5610 5611 // C++98 [class.friend]p1: A friend of a class is a function 5612 // or class that is not a member of the class . . . 5613 // This is fixed in DR77, which just barely didn't make the C++03 5614 // deadline. It's also a very silly restriction that seriously 5615 // affects inner classes and which nobody else seems to implement; 5616 // thus we never diagnose it, not even in -pedantic. 5617 // 5618 // But note that we could warn about it: it's always useless to 5619 // friend one of your own members (it's not, however, worthless to 5620 // friend a member of an arbitrary specialization of your template). 5621 5622 Decl *D; 5623 if (unsigned NumTempParamLists = TempParams.size()) 5624 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5625 NumTempParamLists, 5626 (TemplateParameterList**) TempParams.release(), 5627 TSI, 5628 DS.getFriendSpecLoc()); 5629 else 5630 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5631 5632 if (!D) 5633 return DeclPtrTy(); 5634 5635 D->setAccess(AS_public); 5636 CurContext->addDecl(D); 5637 5638 return DeclPtrTy::make(D); 5639} 5640 5641Sema::DeclPtrTy 5642Sema::ActOnFriendFunctionDecl(Scope *S, 5643 Declarator &D, 5644 bool IsDefinition, 5645 MultiTemplateParamsArg TemplateParams) { 5646 const DeclSpec &DS = D.getDeclSpec(); 5647 5648 assert(DS.isFriendSpecified()); 5649 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5650 5651 SourceLocation Loc = D.getIdentifierLoc(); 5652 TypeSourceInfo *TInfo = 0; 5653 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5654 5655 // C++ [class.friend]p1 5656 // A friend of a class is a function or class.... 5657 // Note that this sees through typedefs, which is intended. 5658 // It *doesn't* see through dependent types, which is correct 5659 // according to [temp.arg.type]p3: 5660 // If a declaration acquires a function type through a 5661 // type dependent on a template-parameter and this causes 5662 // a declaration that does not use the syntactic form of a 5663 // function declarator to have a function type, the program 5664 // is ill-formed. 5665 if (!T->isFunctionType()) { 5666 Diag(Loc, diag::err_unexpected_friend); 5667 5668 // It might be worthwhile to try to recover by creating an 5669 // appropriate declaration. 5670 return DeclPtrTy(); 5671 } 5672 5673 // C++ [namespace.memdef]p3 5674 // - If a friend declaration in a non-local class first declares a 5675 // class or function, the friend class or function is a member 5676 // of the innermost enclosing namespace. 5677 // - The name of the friend is not found by simple name lookup 5678 // until a matching declaration is provided in that namespace 5679 // scope (either before or after the class declaration granting 5680 // friendship). 5681 // - If a friend function is called, its name may be found by the 5682 // name lookup that considers functions from namespaces and 5683 // classes associated with the types of the function arguments. 5684 // - When looking for a prior declaration of a class or a function 5685 // declared as a friend, scopes outside the innermost enclosing 5686 // namespace scope are not considered. 5687 5688 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5689 DeclarationName Name = GetNameForDeclarator(D); 5690 assert(Name); 5691 5692 // The context we found the declaration in, or in which we should 5693 // create the declaration. 5694 DeclContext *DC; 5695 5696 // FIXME: handle local classes 5697 5698 // Recover from invalid scope qualifiers as if they just weren't there. 5699 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5700 ForRedeclaration); 5701 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5702 DC = computeDeclContext(ScopeQual); 5703 5704 // FIXME: handle dependent contexts 5705 if (!DC) return DeclPtrTy(); 5706 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5707 5708 LookupQualifiedName(Previous, DC); 5709 5710 // If searching in that context implicitly found a declaration in 5711 // a different context, treat it like it wasn't found at all. 5712 // TODO: better diagnostics for this case. Suggesting the right 5713 // qualified scope would be nice... 5714 // FIXME: getRepresentativeDecl() is not right here at all 5715 if (Previous.empty() || 5716 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5717 D.setInvalidType(); 5718 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5719 return DeclPtrTy(); 5720 } 5721 5722 // C++ [class.friend]p1: A friend of a class is a function or 5723 // class that is not a member of the class . . . 5724 if (DC->Equals(CurContext)) 5725 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5726 5727 // Otherwise walk out to the nearest namespace scope looking for matches. 5728 } else { 5729 // TODO: handle local class contexts. 5730 5731 DC = CurContext; 5732 while (true) { 5733 // Skip class contexts. If someone can cite chapter and verse 5734 // for this behavior, that would be nice --- it's what GCC and 5735 // EDG do, and it seems like a reasonable intent, but the spec 5736 // really only says that checks for unqualified existing 5737 // declarations should stop at the nearest enclosing namespace, 5738 // not that they should only consider the nearest enclosing 5739 // namespace. 5740 while (DC->isRecord()) 5741 DC = DC->getParent(); 5742 5743 LookupQualifiedName(Previous, DC); 5744 5745 // TODO: decide what we think about using declarations. 5746 if (!Previous.empty()) 5747 break; 5748 5749 if (DC->isFileContext()) break; 5750 DC = DC->getParent(); 5751 } 5752 5753 // C++ [class.friend]p1: A friend of a class is a function or 5754 // class that is not a member of the class . . . 5755 // C++0x changes this for both friend types and functions. 5756 // Most C++ 98 compilers do seem to give an error here, so 5757 // we do, too. 5758 if (!Previous.empty() && DC->Equals(CurContext) 5759 && !getLangOptions().CPlusPlus0x) 5760 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5761 } 5762 5763 if (DC->isFileContext()) { 5764 // This implies that it has to be an operator or function. 5765 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5766 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5767 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5768 Diag(Loc, diag::err_introducing_special_friend) << 5769 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5770 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5771 return DeclPtrTy(); 5772 } 5773 } 5774 5775 bool Redeclaration = false; 5776 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5777 move(TemplateParams), 5778 IsDefinition, 5779 Redeclaration); 5780 if (!ND) return DeclPtrTy(); 5781 5782 assert(ND->getDeclContext() == DC); 5783 assert(ND->getLexicalDeclContext() == CurContext); 5784 5785 // Add the function declaration to the appropriate lookup tables, 5786 // adjusting the redeclarations list as necessary. We don't 5787 // want to do this yet if the friending class is dependent. 5788 // 5789 // Also update the scope-based lookup if the target context's 5790 // lookup context is in lexical scope. 5791 if (!CurContext->isDependentContext()) { 5792 DC = DC->getLookupContext(); 5793 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5794 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5795 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5796 } 5797 5798 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5799 D.getIdentifierLoc(), ND, 5800 DS.getFriendSpecLoc()); 5801 FrD->setAccess(AS_public); 5802 CurContext->addDecl(FrD); 5803 5804 return DeclPtrTy::make(ND); 5805} 5806 5807void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5808 AdjustDeclIfTemplate(dcl); 5809 5810 Decl *Dcl = dcl.getAs<Decl>(); 5811 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5812 if (!Fn) { 5813 Diag(DelLoc, diag::err_deleted_non_function); 5814 return; 5815 } 5816 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5817 Diag(DelLoc, diag::err_deleted_decl_not_first); 5818 Diag(Prev->getLocation(), diag::note_previous_declaration); 5819 // If the declaration wasn't the first, we delete the function anyway for 5820 // recovery. 5821 } 5822 Fn->setDeleted(); 5823} 5824 5825static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5826 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5827 ++CI) { 5828 Stmt *SubStmt = *CI; 5829 if (!SubStmt) 5830 continue; 5831 if (isa<ReturnStmt>(SubStmt)) 5832 Self.Diag(SubStmt->getSourceRange().getBegin(), 5833 diag::err_return_in_constructor_handler); 5834 if (!isa<Expr>(SubStmt)) 5835 SearchForReturnInStmt(Self, SubStmt); 5836 } 5837} 5838 5839void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5840 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5841 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5842 SearchForReturnInStmt(*this, Handler); 5843 } 5844} 5845 5846bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5847 const CXXMethodDecl *Old) { 5848 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5849 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5850 5851 if (Context.hasSameType(NewTy, OldTy) || 5852 NewTy->isDependentType() || OldTy->isDependentType()) 5853 return false; 5854 5855 // Check if the return types are covariant 5856 QualType NewClassTy, OldClassTy; 5857 5858 /// Both types must be pointers or references to classes. 5859 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5860 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5861 NewClassTy = NewPT->getPointeeType(); 5862 OldClassTy = OldPT->getPointeeType(); 5863 } 5864 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5865 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5866 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5867 NewClassTy = NewRT->getPointeeType(); 5868 OldClassTy = OldRT->getPointeeType(); 5869 } 5870 } 5871 } 5872 5873 // The return types aren't either both pointers or references to a class type. 5874 if (NewClassTy.isNull()) { 5875 Diag(New->getLocation(), 5876 diag::err_different_return_type_for_overriding_virtual_function) 5877 << New->getDeclName() << NewTy << OldTy; 5878 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5879 5880 return true; 5881 } 5882 5883 // C++ [class.virtual]p6: 5884 // If the return type of D::f differs from the return type of B::f, the 5885 // class type in the return type of D::f shall be complete at the point of 5886 // declaration of D::f or shall be the class type D. 5887 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5888 if (!RT->isBeingDefined() && 5889 RequireCompleteType(New->getLocation(), NewClassTy, 5890 PDiag(diag::err_covariant_return_incomplete) 5891 << New->getDeclName())) 5892 return true; 5893 } 5894 5895 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5896 // Check if the new class derives from the old class. 5897 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5898 Diag(New->getLocation(), 5899 diag::err_covariant_return_not_derived) 5900 << New->getDeclName() << NewTy << OldTy; 5901 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5902 return true; 5903 } 5904 5905 // Check if we the conversion from derived to base is valid. 5906 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5907 diag::err_covariant_return_inaccessible_base, 5908 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5909 // FIXME: Should this point to the return type? 5910 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5911 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5912 return true; 5913 } 5914 } 5915 5916 // The qualifiers of the return types must be the same. 5917 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5918 Diag(New->getLocation(), 5919 diag::err_covariant_return_type_different_qualifications) 5920 << New->getDeclName() << NewTy << OldTy; 5921 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5922 return true; 5923 }; 5924 5925 5926 // The new class type must have the same or less qualifiers as the old type. 5927 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5928 Diag(New->getLocation(), 5929 diag::err_covariant_return_type_class_type_more_qualified) 5930 << New->getDeclName() << NewTy << OldTy; 5931 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5932 return true; 5933 }; 5934 5935 return false; 5936} 5937 5938bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5939 const CXXMethodDecl *Old) 5940{ 5941 if (Old->hasAttr<FinalAttr>()) { 5942 Diag(New->getLocation(), diag::err_final_function_overridden) 5943 << New->getDeclName(); 5944 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5945 return true; 5946 } 5947 5948 return false; 5949} 5950 5951/// \brief Mark the given method pure. 5952/// 5953/// \param Method the method to be marked pure. 5954/// 5955/// \param InitRange the source range that covers the "0" initializer. 5956bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5957 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5958 Method->setPure(); 5959 5960 // A class is abstract if at least one function is pure virtual. 5961 Method->getParent()->setAbstract(true); 5962 return false; 5963 } 5964 5965 if (!Method->isInvalidDecl()) 5966 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5967 << Method->getDeclName() << InitRange; 5968 return true; 5969} 5970 5971/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5972/// an initializer for the out-of-line declaration 'Dcl'. The scope 5973/// is a fresh scope pushed for just this purpose. 5974/// 5975/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5976/// static data member of class X, names should be looked up in the scope of 5977/// class X. 5978void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5979 // If there is no declaration, there was an error parsing it. 5980 Decl *D = Dcl.getAs<Decl>(); 5981 if (D == 0) return; 5982 5983 // We should only get called for declarations with scope specifiers, like: 5984 // int foo::bar; 5985 assert(D->isOutOfLine()); 5986 EnterDeclaratorContext(S, D->getDeclContext()); 5987} 5988 5989/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5990/// initializer for the out-of-line declaration 'Dcl'. 5991void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5992 // If there is no declaration, there was an error parsing it. 5993 Decl *D = Dcl.getAs<Decl>(); 5994 if (D == 0) return; 5995 5996 assert(D->isOutOfLine()); 5997 ExitDeclaratorContext(S); 5998} 5999 6000/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6001/// C++ if/switch/while/for statement. 6002/// e.g: "if (int x = f()) {...}" 6003Action::DeclResult 6004Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6005 // C++ 6.4p2: 6006 // The declarator shall not specify a function or an array. 6007 // The type-specifier-seq shall not contain typedef and shall not declare a 6008 // new class or enumeration. 6009 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6010 "Parser allowed 'typedef' as storage class of condition decl."); 6011 6012 TypeSourceInfo *TInfo = 0; 6013 TagDecl *OwnedTag = 0; 6014 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 6015 6016 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6017 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6018 // would be created and CXXConditionDeclExpr wants a VarDecl. 6019 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6020 << D.getSourceRange(); 6021 return DeclResult(); 6022 } else if (OwnedTag && OwnedTag->isDefinition()) { 6023 // The type-specifier-seq shall not declare a new class or enumeration. 6024 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6025 } 6026 6027 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6028 if (!Dcl) 6029 return DeclResult(); 6030 6031 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6032 VD->setDeclaredInCondition(true); 6033 return Dcl; 6034} 6035 6036void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6037 bool DefinitionRequired) { 6038 // Ignore any vtable uses in unevaluated operands or for classes that do 6039 // not have a vtable. 6040 if (!Class->isDynamicClass() || Class->isDependentContext() || 6041 CurContext->isDependentContext() || 6042 ExprEvalContexts.back().Context == Unevaluated) 6043 return; 6044 6045 // Try to insert this class into the map. 6046 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6047 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6048 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6049 if (!Pos.second) { 6050 Pos.first->second = Pos.first->second || DefinitionRequired; 6051 return; 6052 } 6053 6054 // Local classes need to have their virtual members marked 6055 // immediately. For all other classes, we mark their virtual members 6056 // at the end of the translation unit. 6057 if (Class->isLocalClass()) 6058 MarkVirtualMembersReferenced(Loc, Class); 6059 else 6060 VTableUses.push_back(std::make_pair(Class, Loc)); 6061} 6062 6063bool Sema::DefineUsedVTables() { 6064 // If any dynamic classes have their key function defined within 6065 // this translation unit, then those vtables are considered "used" and must 6066 // be emitted. 6067 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6068 if (const CXXMethodDecl *KeyFunction 6069 = Context.getKeyFunction(DynamicClasses[I])) { 6070 const FunctionDecl *Definition = 0; 6071 if (KeyFunction->getBody(Definition)) 6072 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6073 } 6074 } 6075 6076 if (VTableUses.empty()) 6077 return false; 6078 6079 // Note: The VTableUses vector could grow as a result of marking 6080 // the members of a class as "used", so we check the size each 6081 // time through the loop and prefer indices (with are stable) to 6082 // iterators (which are not). 6083 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6084 CXXRecordDecl *Class 6085 = cast_or_null<CXXRecordDecl>(VTableUses[I].first)->getDefinition(); 6086 if (!Class) 6087 continue; 6088 6089 SourceLocation Loc = VTableUses[I].second; 6090 6091 // If this class has a key function, but that key function is 6092 // defined in another translation unit, we don't need to emit the 6093 // vtable even though we're using it. 6094 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6095 if (KeyFunction && !KeyFunction->getBody()) { 6096 switch (KeyFunction->getTemplateSpecializationKind()) { 6097 case TSK_Undeclared: 6098 case TSK_ExplicitSpecialization: 6099 case TSK_ExplicitInstantiationDeclaration: 6100 // The key function is in another translation unit. 6101 continue; 6102 6103 case TSK_ExplicitInstantiationDefinition: 6104 case TSK_ImplicitInstantiation: 6105 // We will be instantiating the key function. 6106 break; 6107 } 6108 } else if (!KeyFunction) { 6109 // If we have a class with no key function that is the subject 6110 // of an explicit instantiation declaration, suppress the 6111 // vtable; it will live with the explicit instantiation 6112 // definition. 6113 bool IsExplicitInstantiationDeclaration 6114 = Class->getTemplateSpecializationKind() 6115 == TSK_ExplicitInstantiationDeclaration; 6116 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6117 REnd = Class->redecls_end(); 6118 R != REnd; ++R) { 6119 TemplateSpecializationKind TSK 6120 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6121 if (TSK == TSK_ExplicitInstantiationDeclaration) 6122 IsExplicitInstantiationDeclaration = true; 6123 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6124 IsExplicitInstantiationDeclaration = false; 6125 break; 6126 } 6127 } 6128 6129 if (IsExplicitInstantiationDeclaration) 6130 continue; 6131 } 6132 6133 // Mark all of the virtual members of this class as referenced, so 6134 // that we can build a vtable. Then, tell the AST consumer that a 6135 // vtable for this class is required. 6136 MarkVirtualMembersReferenced(Loc, Class); 6137 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6138 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6139 6140 // Optionally warn if we're emitting a weak vtable. 6141 if (Class->getLinkage() == ExternalLinkage && 6142 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6143 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6144 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6145 } 6146 } 6147 VTableUses.clear(); 6148 6149 return true; 6150} 6151 6152void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6153 const CXXRecordDecl *RD) { 6154 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6155 e = RD->method_end(); i != e; ++i) { 6156 CXXMethodDecl *MD = *i; 6157 6158 // C++ [basic.def.odr]p2: 6159 // [...] A virtual member function is used if it is not pure. [...] 6160 if (MD->isVirtual() && !MD->isPure()) 6161 MarkDeclarationReferenced(Loc, MD); 6162 } 6163 6164 // Only classes that have virtual bases need a VTT. 6165 if (RD->getNumVBases() == 0) 6166 return; 6167 6168 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6169 e = RD->bases_end(); i != e; ++i) { 6170 const CXXRecordDecl *Base = 6171 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6172 if (i->isVirtual()) 6173 continue; 6174 if (Base->getNumVBases() == 0) 6175 continue; 6176 MarkVirtualMembersReferenced(Loc, Base); 6177 } 6178} 6179 6180/// SetIvarInitializers - This routine builds initialization ASTs for the 6181/// Objective-C implementation whose ivars need be initialized. 6182void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6183 if (!getLangOptions().CPlusPlus) 6184 return; 6185 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6186 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6187 CollectIvarsToConstructOrDestruct(OID, ivars); 6188 if (ivars.empty()) 6189 return; 6190 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6191 for (unsigned i = 0; i < ivars.size(); i++) { 6192 FieldDecl *Field = ivars[i]; 6193 if (Field->isInvalidDecl()) 6194 continue; 6195 6196 CXXBaseOrMemberInitializer *Member; 6197 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6198 InitializationKind InitKind = 6199 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6200 6201 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6202 Sema::OwningExprResult MemberInit = 6203 InitSeq.Perform(*this, InitEntity, InitKind, 6204 Sema::MultiExprArg(*this, 0, 0)); 6205 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6206 // Note, MemberInit could actually come back empty if no initialization 6207 // is required (e.g., because it would call a trivial default constructor) 6208 if (!MemberInit.get() || MemberInit.isInvalid()) 6209 continue; 6210 6211 Member = 6212 new (Context) CXXBaseOrMemberInitializer(Context, 6213 Field, SourceLocation(), 6214 SourceLocation(), 6215 MemberInit.takeAs<Expr>(), 6216 SourceLocation()); 6217 AllToInit.push_back(Member); 6218 6219 // Be sure that the destructor is accessible and is marked as referenced. 6220 if (const RecordType *RecordTy 6221 = Context.getBaseElementType(Field->getType()) 6222 ->getAs<RecordType>()) { 6223 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6224 if (CXXDestructorDecl *Destructor 6225 = const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) { 6226 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6227 CheckDestructorAccess(Field->getLocation(), Destructor, 6228 PDiag(diag::err_access_dtor_ivar) 6229 << Context.getBaseElementType(Field->getType())); 6230 } 6231 } 6232 } 6233 ObjCImplementation->setIvarInitializers(Context, 6234 AllToInit.data(), AllToInit.size()); 6235 } 6236} 6237