SemaDeclCXX.cpp revision b9aefa775158b68c453e4ac0e4e2ada561900d26
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 if (!Class->hasObjectMember()) { 626 if (const RecordType *FDTTy = 627 NewBaseType.getTypePtr()->getAs<RecordType>()) 628 if (FDTTy->getDecl()->hasObjectMember()) 629 Class->setHasObjectMember(true); 630 } 631 632 if (KnownBaseTypes[NewBaseType]) { 633 // C++ [class.mi]p3: 634 // A class shall not be specified as a direct base class of a 635 // derived class more than once. 636 Diag(Bases[idx]->getSourceRange().getBegin(), 637 diag::err_duplicate_base_class) 638 << KnownBaseTypes[NewBaseType]->getType() 639 << Bases[idx]->getSourceRange(); 640 641 // Delete the duplicate base class specifier; we're going to 642 // overwrite its pointer later. 643 Context.Deallocate(Bases[idx]); 644 645 Invalid = true; 646 } else { 647 // Okay, add this new base class. 648 KnownBaseTypes[NewBaseType] = Bases[idx]; 649 Bases[NumGoodBases++] = Bases[idx]; 650 } 651 } 652 653 // Attach the remaining base class specifiers to the derived class. 654 Class->setBases(Bases, NumGoodBases); 655 656 // Delete the remaining (good) base class specifiers, since their 657 // data has been copied into the CXXRecordDecl. 658 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 659 Context.Deallocate(Bases[idx]); 660 661 return Invalid; 662} 663 664/// ActOnBaseSpecifiers - Attach the given base specifiers to the 665/// class, after checking whether there are any duplicate base 666/// classes. 667void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 668 unsigned NumBases) { 669 if (!ClassDecl || !Bases || !NumBases) 670 return; 671 672 AdjustDeclIfTemplate(ClassDecl); 673 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 674 (CXXBaseSpecifier**)(Bases), NumBases); 675} 676 677static CXXRecordDecl *GetClassForType(QualType T) { 678 if (const RecordType *RT = T->getAs<RecordType>()) 679 return cast<CXXRecordDecl>(RT->getDecl()); 680 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 681 return ICT->getDecl(); 682 else 683 return 0; 684} 685 686/// \brief Determine whether the type \p Derived is a C++ class that is 687/// derived from the type \p Base. 688bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 689 if (!getLangOptions().CPlusPlus) 690 return false; 691 692 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 693 if (!DerivedRD) 694 return false; 695 696 CXXRecordDecl *BaseRD = GetClassForType(Base); 697 if (!BaseRD) 698 return false; 699 700 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 701 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 702} 703 704/// \brief Determine whether the type \p Derived is a C++ class that is 705/// derived from the type \p Base. 706bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 707 if (!getLangOptions().CPlusPlus) 708 return false; 709 710 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 711 if (!DerivedRD) 712 return false; 713 714 CXXRecordDecl *BaseRD = GetClassForType(Base); 715 if (!BaseRD) 716 return false; 717 718 return DerivedRD->isDerivedFrom(BaseRD, Paths); 719} 720 721void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 722 CXXBaseSpecifierArray &BasePathArray) { 723 assert(BasePathArray.empty() && "Base path array must be empty!"); 724 assert(Paths.isRecordingPaths() && "Must record paths!"); 725 726 const CXXBasePath &Path = Paths.front(); 727 728 // We first go backward and check if we have a virtual base. 729 // FIXME: It would be better if CXXBasePath had the base specifier for 730 // the nearest virtual base. 731 unsigned Start = 0; 732 for (unsigned I = Path.size(); I != 0; --I) { 733 if (Path[I - 1].Base->isVirtual()) { 734 Start = I - 1; 735 break; 736 } 737 } 738 739 // Now add all bases. 740 for (unsigned I = Start, E = Path.size(); I != E; ++I) 741 BasePathArray.push_back(Path[I].Base); 742} 743 744/// \brief Determine whether the given base path includes a virtual 745/// base class. 746bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 747 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 748 BEnd = BasePath.end(); 749 B != BEnd; ++B) 750 if ((*B)->isVirtual()) 751 return true; 752 753 return false; 754} 755 756/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 757/// conversion (where Derived and Base are class types) is 758/// well-formed, meaning that the conversion is unambiguous (and 759/// that all of the base classes are accessible). Returns true 760/// and emits a diagnostic if the code is ill-formed, returns false 761/// otherwise. Loc is the location where this routine should point to 762/// if there is an error, and Range is the source range to highlight 763/// if there is an error. 764bool 765Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 766 unsigned InaccessibleBaseID, 767 unsigned AmbigiousBaseConvID, 768 SourceLocation Loc, SourceRange Range, 769 DeclarationName Name, 770 CXXBaseSpecifierArray *BasePath) { 771 // First, determine whether the path from Derived to Base is 772 // ambiguous. This is slightly more expensive than checking whether 773 // the Derived to Base conversion exists, because here we need to 774 // explore multiple paths to determine if there is an ambiguity. 775 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 776 /*DetectVirtual=*/false); 777 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 778 assert(DerivationOkay && 779 "Can only be used with a derived-to-base conversion"); 780 (void)DerivationOkay; 781 782 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 783 if (InaccessibleBaseID) { 784 // Check that the base class can be accessed. 785 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 786 InaccessibleBaseID)) { 787 case AR_inaccessible: 788 return true; 789 case AR_accessible: 790 case AR_dependent: 791 case AR_delayed: 792 break; 793 } 794 } 795 796 // Build a base path if necessary. 797 if (BasePath) 798 BuildBasePathArray(Paths, *BasePath); 799 return false; 800 } 801 802 // We know that the derived-to-base conversion is ambiguous, and 803 // we're going to produce a diagnostic. Perform the derived-to-base 804 // search just one more time to compute all of the possible paths so 805 // that we can print them out. This is more expensive than any of 806 // the previous derived-to-base checks we've done, but at this point 807 // performance isn't as much of an issue. 808 Paths.clear(); 809 Paths.setRecordingPaths(true); 810 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 811 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 812 (void)StillOkay; 813 814 // Build up a textual representation of the ambiguous paths, e.g., 815 // D -> B -> A, that will be used to illustrate the ambiguous 816 // conversions in the diagnostic. We only print one of the paths 817 // to each base class subobject. 818 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 819 820 Diag(Loc, AmbigiousBaseConvID) 821 << Derived << Base << PathDisplayStr << Range << Name; 822 return true; 823} 824 825bool 826Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 827 SourceLocation Loc, SourceRange Range, 828 CXXBaseSpecifierArray *BasePath, 829 bool IgnoreAccess) { 830 return CheckDerivedToBaseConversion(Derived, Base, 831 IgnoreAccess ? 0 832 : diag::err_upcast_to_inaccessible_base, 833 diag::err_ambiguous_derived_to_base_conv, 834 Loc, Range, DeclarationName(), 835 BasePath); 836} 837 838 839/// @brief Builds a string representing ambiguous paths from a 840/// specific derived class to different subobjects of the same base 841/// class. 842/// 843/// This function builds a string that can be used in error messages 844/// to show the different paths that one can take through the 845/// inheritance hierarchy to go from the derived class to different 846/// subobjects of a base class. The result looks something like this: 847/// @code 848/// struct D -> struct B -> struct A 849/// struct D -> struct C -> struct A 850/// @endcode 851std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 852 std::string PathDisplayStr; 853 std::set<unsigned> DisplayedPaths; 854 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 855 Path != Paths.end(); ++Path) { 856 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 857 // We haven't displayed a path to this particular base 858 // class subobject yet. 859 PathDisplayStr += "\n "; 860 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 861 for (CXXBasePath::const_iterator Element = Path->begin(); 862 Element != Path->end(); ++Element) 863 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 864 } 865 } 866 867 return PathDisplayStr; 868} 869 870//===----------------------------------------------------------------------===// 871// C++ class member Handling 872//===----------------------------------------------------------------------===// 873 874/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 875/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 876/// bitfield width if there is one and 'InitExpr' specifies the initializer if 877/// any. 878Sema::DeclPtrTy 879Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 880 MultiTemplateParamsArg TemplateParameterLists, 881 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 882 bool Deleted) { 883 const DeclSpec &DS = D.getDeclSpec(); 884 DeclarationName Name = GetNameForDeclarator(D); 885 Expr *BitWidth = static_cast<Expr*>(BW); 886 Expr *Init = static_cast<Expr*>(InitExpr); 887 SourceLocation Loc = D.getIdentifierLoc(); 888 889 bool isFunc = D.isFunctionDeclarator(); 890 891 assert(!DS.isFriendSpecified()); 892 893 // C++ 9.2p6: A member shall not be declared to have automatic storage 894 // duration (auto, register) or with the extern storage-class-specifier. 895 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 896 // data members and cannot be applied to names declared const or static, 897 // and cannot be applied to reference members. 898 switch (DS.getStorageClassSpec()) { 899 case DeclSpec::SCS_unspecified: 900 case DeclSpec::SCS_typedef: 901 case DeclSpec::SCS_static: 902 // FALL THROUGH. 903 break; 904 case DeclSpec::SCS_mutable: 905 if (isFunc) { 906 if (DS.getStorageClassSpecLoc().isValid()) 907 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 908 else 909 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 910 911 // FIXME: It would be nicer if the keyword was ignored only for this 912 // declarator. Otherwise we could get follow-up errors. 913 D.getMutableDeclSpec().ClearStorageClassSpecs(); 914 } else { 915 QualType T = GetTypeForDeclarator(D, S); 916 diag::kind err = static_cast<diag::kind>(0); 917 if (T->isReferenceType()) 918 err = diag::err_mutable_reference; 919 else if (T.isConstQualified()) 920 err = diag::err_mutable_const; 921 if (err != 0) { 922 if (DS.getStorageClassSpecLoc().isValid()) 923 Diag(DS.getStorageClassSpecLoc(), err); 924 else 925 Diag(DS.getThreadSpecLoc(), err); 926 // FIXME: It would be nicer if the keyword was ignored only for this 927 // declarator. Otherwise we could get follow-up errors. 928 D.getMutableDeclSpec().ClearStorageClassSpecs(); 929 } 930 } 931 break; 932 default: 933 if (DS.getStorageClassSpecLoc().isValid()) 934 Diag(DS.getStorageClassSpecLoc(), 935 diag::err_storageclass_invalid_for_member); 936 else 937 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 938 D.getMutableDeclSpec().ClearStorageClassSpecs(); 939 } 940 941 if (!isFunc && 942 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 943 D.getNumTypeObjects() == 0) { 944 // Check also for this case: 945 // 946 // typedef int f(); 947 // f a; 948 // 949 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 950 isFunc = TDType->isFunctionType(); 951 } 952 953 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 954 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 955 !isFunc); 956 957 Decl *Member; 958 if (isInstField) { 959 // FIXME: Check for template parameters! 960 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 961 AS); 962 assert(Member && "HandleField never returns null"); 963 } else { 964 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 965 .getAs<Decl>(); 966 if (!Member) { 967 if (BitWidth) DeleteExpr(BitWidth); 968 return DeclPtrTy(); 969 } 970 971 // Non-instance-fields can't have a bitfield. 972 if (BitWidth) { 973 if (Member->isInvalidDecl()) { 974 // don't emit another diagnostic. 975 } else if (isa<VarDecl>(Member)) { 976 // C++ 9.6p3: A bit-field shall not be a static member. 977 // "static member 'A' cannot be a bit-field" 978 Diag(Loc, diag::err_static_not_bitfield) 979 << Name << BitWidth->getSourceRange(); 980 } else if (isa<TypedefDecl>(Member)) { 981 // "typedef member 'x' cannot be a bit-field" 982 Diag(Loc, diag::err_typedef_not_bitfield) 983 << Name << BitWidth->getSourceRange(); 984 } else { 985 // A function typedef ("typedef int f(); f a;"). 986 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 987 Diag(Loc, diag::err_not_integral_type_bitfield) 988 << Name << cast<ValueDecl>(Member)->getType() 989 << BitWidth->getSourceRange(); 990 } 991 992 DeleteExpr(BitWidth); 993 BitWidth = 0; 994 Member->setInvalidDecl(); 995 } 996 997 Member->setAccess(AS); 998 999 // If we have declared a member function template, set the access of the 1000 // templated declaration as well. 1001 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1002 FunTmpl->getTemplatedDecl()->setAccess(AS); 1003 } 1004 1005 assert((Name || isInstField) && "No identifier for non-field ?"); 1006 1007 if (Init) 1008 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1009 if (Deleted) // FIXME: Source location is not very good. 1010 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1011 1012 if (isInstField) { 1013 FieldCollector->Add(cast<FieldDecl>(Member)); 1014 return DeclPtrTy(); 1015 } 1016 return DeclPtrTy::make(Member); 1017} 1018 1019/// \brief Find the direct and/or virtual base specifiers that 1020/// correspond to the given base type, for use in base initialization 1021/// within a constructor. 1022static bool FindBaseInitializer(Sema &SemaRef, 1023 CXXRecordDecl *ClassDecl, 1024 QualType BaseType, 1025 const CXXBaseSpecifier *&DirectBaseSpec, 1026 const CXXBaseSpecifier *&VirtualBaseSpec) { 1027 // First, check for a direct base class. 1028 DirectBaseSpec = 0; 1029 for (CXXRecordDecl::base_class_const_iterator Base 1030 = ClassDecl->bases_begin(); 1031 Base != ClassDecl->bases_end(); ++Base) { 1032 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1033 // We found a direct base of this type. That's what we're 1034 // initializing. 1035 DirectBaseSpec = &*Base; 1036 break; 1037 } 1038 } 1039 1040 // Check for a virtual base class. 1041 // FIXME: We might be able to short-circuit this if we know in advance that 1042 // there are no virtual bases. 1043 VirtualBaseSpec = 0; 1044 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1045 // We haven't found a base yet; search the class hierarchy for a 1046 // virtual base class. 1047 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1048 /*DetectVirtual=*/false); 1049 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1050 BaseType, Paths)) { 1051 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1052 Path != Paths.end(); ++Path) { 1053 if (Path->back().Base->isVirtual()) { 1054 VirtualBaseSpec = Path->back().Base; 1055 break; 1056 } 1057 } 1058 } 1059 } 1060 1061 return DirectBaseSpec || VirtualBaseSpec; 1062} 1063 1064/// ActOnMemInitializer - Handle a C++ member initializer. 1065Sema::MemInitResult 1066Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1067 Scope *S, 1068 CXXScopeSpec &SS, 1069 IdentifierInfo *MemberOrBase, 1070 TypeTy *TemplateTypeTy, 1071 SourceLocation IdLoc, 1072 SourceLocation LParenLoc, 1073 ExprTy **Args, unsigned NumArgs, 1074 SourceLocation *CommaLocs, 1075 SourceLocation RParenLoc) { 1076 if (!ConstructorD) 1077 return true; 1078 1079 AdjustDeclIfTemplate(ConstructorD); 1080 1081 CXXConstructorDecl *Constructor 1082 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1083 if (!Constructor) { 1084 // The user wrote a constructor initializer on a function that is 1085 // not a C++ constructor. Ignore the error for now, because we may 1086 // have more member initializers coming; we'll diagnose it just 1087 // once in ActOnMemInitializers. 1088 return true; 1089 } 1090 1091 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1092 1093 // C++ [class.base.init]p2: 1094 // Names in a mem-initializer-id are looked up in the scope of the 1095 // constructor’s class and, if not found in that scope, are looked 1096 // up in the scope containing the constructor’s 1097 // definition. [Note: if the constructor’s class contains a member 1098 // with the same name as a direct or virtual base class of the 1099 // class, a mem-initializer-id naming the member or base class and 1100 // composed of a single identifier refers to the class member. A 1101 // mem-initializer-id for the hidden base class may be specified 1102 // using a qualified name. ] 1103 if (!SS.getScopeRep() && !TemplateTypeTy) { 1104 // Look for a member, first. 1105 FieldDecl *Member = 0; 1106 DeclContext::lookup_result Result 1107 = ClassDecl->lookup(MemberOrBase); 1108 if (Result.first != Result.second) 1109 Member = dyn_cast<FieldDecl>(*Result.first); 1110 1111 // FIXME: Handle members of an anonymous union. 1112 1113 if (Member) 1114 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1115 LParenLoc, RParenLoc); 1116 } 1117 // It didn't name a member, so see if it names a class. 1118 QualType BaseType; 1119 TypeSourceInfo *TInfo = 0; 1120 1121 if (TemplateTypeTy) { 1122 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1123 } else { 1124 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1125 LookupParsedName(R, S, &SS); 1126 1127 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1128 if (!TyD) { 1129 if (R.isAmbiguous()) return true; 1130 1131 // We don't want access-control diagnostics here. 1132 R.suppressDiagnostics(); 1133 1134 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1135 bool NotUnknownSpecialization = false; 1136 DeclContext *DC = computeDeclContext(SS, false); 1137 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1138 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1139 1140 if (!NotUnknownSpecialization) { 1141 // When the scope specifier can refer to a member of an unknown 1142 // specialization, we take it as a type name. 1143 BaseType = CheckTypenameType(ETK_None, 1144 (NestedNameSpecifier *)SS.getScopeRep(), 1145 *MemberOrBase, SourceLocation(), 1146 SS.getRange(), IdLoc); 1147 if (BaseType.isNull()) 1148 return true; 1149 1150 R.clear(); 1151 } 1152 } 1153 1154 // If no results were found, try to correct typos. 1155 if (R.empty() && BaseType.isNull() && 1156 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1157 R.isSingleResult()) { 1158 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1159 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1160 // We have found a non-static data member with a similar 1161 // name to what was typed; complain and initialize that 1162 // member. 1163 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1164 << MemberOrBase << true << R.getLookupName() 1165 << FixItHint::CreateReplacement(R.getNameLoc(), 1166 R.getLookupName().getAsString()); 1167 Diag(Member->getLocation(), diag::note_previous_decl) 1168 << Member->getDeclName(); 1169 1170 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1171 LParenLoc, RParenLoc); 1172 } 1173 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1174 const CXXBaseSpecifier *DirectBaseSpec; 1175 const CXXBaseSpecifier *VirtualBaseSpec; 1176 if (FindBaseInitializer(*this, ClassDecl, 1177 Context.getTypeDeclType(Type), 1178 DirectBaseSpec, VirtualBaseSpec)) { 1179 // We have found a direct or virtual base class with a 1180 // similar name to what was typed; complain and initialize 1181 // that base class. 1182 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1183 << MemberOrBase << false << R.getLookupName() 1184 << FixItHint::CreateReplacement(R.getNameLoc(), 1185 R.getLookupName().getAsString()); 1186 1187 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1188 : VirtualBaseSpec; 1189 Diag(BaseSpec->getSourceRange().getBegin(), 1190 diag::note_base_class_specified_here) 1191 << BaseSpec->getType() 1192 << BaseSpec->getSourceRange(); 1193 1194 TyD = Type; 1195 } 1196 } 1197 } 1198 1199 if (!TyD && BaseType.isNull()) { 1200 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1201 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1202 return true; 1203 } 1204 } 1205 1206 if (BaseType.isNull()) { 1207 BaseType = Context.getTypeDeclType(TyD); 1208 if (SS.isSet()) { 1209 NestedNameSpecifier *Qualifier = 1210 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1211 1212 // FIXME: preserve source range information 1213 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1214 } 1215 } 1216 } 1217 1218 if (!TInfo) 1219 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1220 1221 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1222 LParenLoc, RParenLoc, ClassDecl); 1223} 1224 1225/// Checks an initializer expression for use of uninitialized fields, such as 1226/// containing the field that is being initialized. Returns true if there is an 1227/// uninitialized field was used an updates the SourceLocation parameter; false 1228/// otherwise. 1229static bool InitExprContainsUninitializedFields(const Stmt* S, 1230 const FieldDecl* LhsField, 1231 SourceLocation* L) { 1232 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1233 if (ME) { 1234 const NamedDecl* RhsField = ME->getMemberDecl(); 1235 if (RhsField == LhsField) { 1236 // Initializing a field with itself. Throw a warning. 1237 // But wait; there are exceptions! 1238 // Exception #1: The field may not belong to this record. 1239 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1240 const Expr* base = ME->getBase(); 1241 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1242 // Even though the field matches, it does not belong to this record. 1243 return false; 1244 } 1245 // None of the exceptions triggered; return true to indicate an 1246 // uninitialized field was used. 1247 *L = ME->getMemberLoc(); 1248 return true; 1249 } 1250 } 1251 bool found = false; 1252 for (Stmt::const_child_iterator it = S->child_begin(); 1253 it != S->child_end() && found == false; 1254 ++it) { 1255 if (isa<CallExpr>(S)) { 1256 // Do not descend into function calls or constructors, as the use 1257 // of an uninitialized field may be valid. One would have to inspect 1258 // the contents of the function/ctor to determine if it is safe or not. 1259 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1260 // may be safe, depending on what the function/ctor does. 1261 continue; 1262 } 1263 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1264 } 1265 return found; 1266} 1267 1268Sema::MemInitResult 1269Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1270 unsigned NumArgs, SourceLocation IdLoc, 1271 SourceLocation LParenLoc, 1272 SourceLocation RParenLoc) { 1273 // Diagnose value-uses of fields to initialize themselves, e.g. 1274 // foo(foo) 1275 // where foo is not also a parameter to the constructor. 1276 // TODO: implement -Wuninitialized and fold this into that framework. 1277 for (unsigned i = 0; i < NumArgs; ++i) { 1278 SourceLocation L; 1279 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1280 // FIXME: Return true in the case when other fields are used before being 1281 // uninitialized. For example, let this field be the i'th field. When 1282 // initializing the i'th field, throw a warning if any of the >= i'th 1283 // fields are used, as they are not yet initialized. 1284 // Right now we are only handling the case where the i'th field uses 1285 // itself in its initializer. 1286 Diag(L, diag::warn_field_is_uninit); 1287 } 1288 } 1289 1290 bool HasDependentArg = false; 1291 for (unsigned i = 0; i < NumArgs; i++) 1292 HasDependentArg |= Args[i]->isTypeDependent(); 1293 1294 QualType FieldType = Member->getType(); 1295 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1296 FieldType = Array->getElementType(); 1297 if (FieldType->isDependentType() || HasDependentArg) { 1298 // Can't check initialization for a member of dependent type or when 1299 // any of the arguments are type-dependent expressions. 1300 OwningExprResult Init 1301 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1302 RParenLoc)); 1303 1304 // Erase any temporaries within this evaluation context; we're not 1305 // going to track them in the AST, since we'll be rebuilding the 1306 // ASTs during template instantiation. 1307 ExprTemporaries.erase( 1308 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1309 ExprTemporaries.end()); 1310 1311 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1312 LParenLoc, 1313 Init.takeAs<Expr>(), 1314 RParenLoc); 1315 1316 } 1317 1318 if (Member->isInvalidDecl()) 1319 return true; 1320 1321 // Initialize the member. 1322 InitializedEntity MemberEntity = 1323 InitializedEntity::InitializeMember(Member, 0); 1324 InitializationKind Kind = 1325 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1326 1327 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1328 1329 OwningExprResult MemberInit = 1330 InitSeq.Perform(*this, MemberEntity, Kind, 1331 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1332 if (MemberInit.isInvalid()) 1333 return true; 1334 1335 // C++0x [class.base.init]p7: 1336 // The initialization of each base and member constitutes a 1337 // full-expression. 1338 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1339 if (MemberInit.isInvalid()) 1340 return true; 1341 1342 // If we are in a dependent context, template instantiation will 1343 // perform this type-checking again. Just save the arguments that we 1344 // received in a ParenListExpr. 1345 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1346 // of the information that we have about the member 1347 // initializer. However, deconstructing the ASTs is a dicey process, 1348 // and this approach is far more likely to get the corner cases right. 1349 if (CurContext->isDependentContext()) { 1350 // Bump the reference count of all of the arguments. 1351 for (unsigned I = 0; I != NumArgs; ++I) 1352 Args[I]->Retain(); 1353 1354 OwningExprResult Init 1355 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1356 RParenLoc)); 1357 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1358 LParenLoc, 1359 Init.takeAs<Expr>(), 1360 RParenLoc); 1361 } 1362 1363 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1364 LParenLoc, 1365 MemberInit.takeAs<Expr>(), 1366 RParenLoc); 1367} 1368 1369Sema::MemInitResult 1370Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1371 Expr **Args, unsigned NumArgs, 1372 SourceLocation LParenLoc, SourceLocation RParenLoc, 1373 CXXRecordDecl *ClassDecl) { 1374 bool HasDependentArg = false; 1375 for (unsigned i = 0; i < NumArgs; i++) 1376 HasDependentArg |= Args[i]->isTypeDependent(); 1377 1378 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1379 if (BaseType->isDependentType() || HasDependentArg) { 1380 // Can't check initialization for a base of dependent type or when 1381 // any of the arguments are type-dependent expressions. 1382 OwningExprResult BaseInit 1383 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1384 RParenLoc)); 1385 1386 // Erase any temporaries within this evaluation context; we're not 1387 // going to track them in the AST, since we'll be rebuilding the 1388 // ASTs during template instantiation. 1389 ExprTemporaries.erase( 1390 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1391 ExprTemporaries.end()); 1392 1393 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1394 /*IsVirtual=*/false, 1395 LParenLoc, 1396 BaseInit.takeAs<Expr>(), 1397 RParenLoc); 1398 } 1399 1400 if (!BaseType->isRecordType()) 1401 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1402 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1403 1404 // C++ [class.base.init]p2: 1405 // [...] Unless the mem-initializer-id names a nonstatic data 1406 // member of the constructor’s class or a direct or virtual base 1407 // of that class, the mem-initializer is ill-formed. A 1408 // mem-initializer-list can initialize a base class using any 1409 // name that denotes that base class type. 1410 1411 // Check for direct and virtual base classes. 1412 const CXXBaseSpecifier *DirectBaseSpec = 0; 1413 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1414 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1415 VirtualBaseSpec); 1416 1417 // C++ [base.class.init]p2: 1418 // If a mem-initializer-id is ambiguous because it designates both 1419 // a direct non-virtual base class and an inherited virtual base 1420 // class, the mem-initializer is ill-formed. 1421 if (DirectBaseSpec && VirtualBaseSpec) 1422 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1423 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1424 // C++ [base.class.init]p2: 1425 // Unless the mem-initializer-id names a nonstatic data membeer of the 1426 // constructor's class ot a direst or virtual base of that class, the 1427 // mem-initializer is ill-formed. 1428 if (!DirectBaseSpec && !VirtualBaseSpec) 1429 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1430 << BaseType << Context.getTypeDeclType(ClassDecl) 1431 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1432 1433 CXXBaseSpecifier *BaseSpec 1434 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1435 if (!BaseSpec) 1436 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1437 1438 // Initialize the base. 1439 InitializedEntity BaseEntity = 1440 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1441 InitializationKind Kind = 1442 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1443 1444 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1445 1446 OwningExprResult BaseInit = 1447 InitSeq.Perform(*this, BaseEntity, Kind, 1448 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1449 if (BaseInit.isInvalid()) 1450 return true; 1451 1452 // C++0x [class.base.init]p7: 1453 // The initialization of each base and member constitutes a 1454 // full-expression. 1455 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1456 if (BaseInit.isInvalid()) 1457 return true; 1458 1459 // If we are in a dependent context, template instantiation will 1460 // perform this type-checking again. Just save the arguments that we 1461 // received in a ParenListExpr. 1462 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1463 // of the information that we have about the base 1464 // initializer. However, deconstructing the ASTs is a dicey process, 1465 // and this approach is far more likely to get the corner cases right. 1466 if (CurContext->isDependentContext()) { 1467 // Bump the reference count of all of the arguments. 1468 for (unsigned I = 0; I != NumArgs; ++I) 1469 Args[I]->Retain(); 1470 1471 OwningExprResult Init 1472 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1473 RParenLoc)); 1474 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1475 BaseSpec->isVirtual(), 1476 LParenLoc, 1477 Init.takeAs<Expr>(), 1478 RParenLoc); 1479 } 1480 1481 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1482 BaseSpec->isVirtual(), 1483 LParenLoc, 1484 BaseInit.takeAs<Expr>(), 1485 RParenLoc); 1486} 1487 1488/// ImplicitInitializerKind - How an implicit base or member initializer should 1489/// initialize its base or member. 1490enum ImplicitInitializerKind { 1491 IIK_Default, 1492 IIK_Copy, 1493 IIK_Move 1494}; 1495 1496static bool 1497BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1498 ImplicitInitializerKind ImplicitInitKind, 1499 CXXBaseSpecifier *BaseSpec, 1500 bool IsInheritedVirtualBase, 1501 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1502 InitializedEntity InitEntity 1503 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1504 IsInheritedVirtualBase); 1505 1506 Sema::OwningExprResult BaseInit(SemaRef); 1507 1508 switch (ImplicitInitKind) { 1509 case IIK_Default: { 1510 InitializationKind InitKind 1511 = InitializationKind::CreateDefault(Constructor->getLocation()); 1512 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1513 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1514 Sema::MultiExprArg(SemaRef, 0, 0)); 1515 break; 1516 } 1517 1518 case IIK_Copy: { 1519 ParmVarDecl *Param = Constructor->getParamDecl(0); 1520 QualType ParamType = Param->getType().getNonReferenceType(); 1521 1522 Expr *CopyCtorArg = 1523 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1524 Constructor->getLocation(), ParamType, 0); 1525 1526 // Cast to the base class to avoid ambiguities. 1527 QualType ArgTy = 1528 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1529 ParamType.getQualifiers()); 1530 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1531 CastExpr::CK_UncheckedDerivedToBase, 1532 /*isLvalue=*/true, 1533 CXXBaseSpecifierArray(BaseSpec)); 1534 1535 InitializationKind InitKind 1536 = InitializationKind::CreateDirect(Constructor->getLocation(), 1537 SourceLocation(), SourceLocation()); 1538 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1539 &CopyCtorArg, 1); 1540 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1541 Sema::MultiExprArg(SemaRef, 1542 (void**)&CopyCtorArg, 1)); 1543 break; 1544 } 1545 1546 case IIK_Move: 1547 assert(false && "Unhandled initializer kind!"); 1548 } 1549 1550 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1551 if (BaseInit.isInvalid()) 1552 return true; 1553 1554 CXXBaseInit = 1555 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1556 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1557 SourceLocation()), 1558 BaseSpec->isVirtual(), 1559 SourceLocation(), 1560 BaseInit.takeAs<Expr>(), 1561 SourceLocation()); 1562 1563 return false; 1564} 1565 1566static bool 1567BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1568 ImplicitInitializerKind ImplicitInitKind, 1569 FieldDecl *Field, 1570 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1571 if (Field->isInvalidDecl()) 1572 return true; 1573 1574 if (ImplicitInitKind == IIK_Copy) { 1575 SourceLocation Loc = Constructor->getLocation(); 1576 ParmVarDecl *Param = Constructor->getParamDecl(0); 1577 QualType ParamType = Param->getType().getNonReferenceType(); 1578 1579 Expr *MemberExprBase = 1580 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1581 Loc, ParamType, 0); 1582 1583 // Build a reference to this field within the parameter. 1584 CXXScopeSpec SS; 1585 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1586 Sema::LookupMemberName); 1587 MemberLookup.addDecl(Field, AS_public); 1588 MemberLookup.resolveKind(); 1589 Sema::OwningExprResult CopyCtorArg 1590 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1591 ParamType, Loc, 1592 /*IsArrow=*/false, 1593 SS, 1594 /*FirstQualifierInScope=*/0, 1595 MemberLookup, 1596 /*TemplateArgs=*/0); 1597 if (CopyCtorArg.isInvalid()) 1598 return true; 1599 1600 // When the field we are copying is an array, create index variables for 1601 // each dimension of the array. We use these index variables to subscript 1602 // the source array, and other clients (e.g., CodeGen) will perform the 1603 // necessary iteration with these index variables. 1604 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1605 QualType BaseType = Field->getType(); 1606 QualType SizeType = SemaRef.Context.getSizeType(); 1607 while (const ConstantArrayType *Array 1608 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1609 // Create the iteration variable for this array index. 1610 IdentifierInfo *IterationVarName = 0; 1611 { 1612 llvm::SmallString<8> Str; 1613 llvm::raw_svector_ostream OS(Str); 1614 OS << "__i" << IndexVariables.size(); 1615 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1616 } 1617 VarDecl *IterationVar 1618 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1619 IterationVarName, SizeType, 1620 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1621 VarDecl::None, VarDecl::None); 1622 IndexVariables.push_back(IterationVar); 1623 1624 // Create a reference to the iteration variable. 1625 Sema::OwningExprResult IterationVarRef 1626 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1627 assert(!IterationVarRef.isInvalid() && 1628 "Reference to invented variable cannot fail!"); 1629 1630 // Subscript the array with this iteration variable. 1631 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1632 Loc, 1633 move(IterationVarRef), 1634 Loc); 1635 if (CopyCtorArg.isInvalid()) 1636 return true; 1637 1638 BaseType = Array->getElementType(); 1639 } 1640 1641 // Construct the entity that we will be initializing. For an array, this 1642 // will be first element in the array, which may require several levels 1643 // of array-subscript entities. 1644 llvm::SmallVector<InitializedEntity, 4> Entities; 1645 Entities.reserve(1 + IndexVariables.size()); 1646 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1647 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1648 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1649 0, 1650 Entities.back())); 1651 1652 // Direct-initialize to use the copy constructor. 1653 InitializationKind InitKind = 1654 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1655 1656 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1657 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1658 &CopyCtorArgE, 1); 1659 1660 Sema::OwningExprResult MemberInit 1661 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1662 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1663 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1664 if (MemberInit.isInvalid()) 1665 return true; 1666 1667 CXXMemberInit 1668 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1669 MemberInit.takeAs<Expr>(), Loc, 1670 IndexVariables.data(), 1671 IndexVariables.size()); 1672 return false; 1673 } 1674 1675 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1676 1677 QualType FieldBaseElementType = 1678 SemaRef.Context.getBaseElementType(Field->getType()); 1679 1680 if (FieldBaseElementType->isRecordType()) { 1681 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1682 InitializationKind InitKind = 1683 InitializationKind::CreateDefault(Constructor->getLocation()); 1684 1685 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1686 Sema::OwningExprResult MemberInit = 1687 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1688 Sema::MultiExprArg(SemaRef, 0, 0)); 1689 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1690 if (MemberInit.isInvalid()) 1691 return true; 1692 1693 CXXMemberInit = 1694 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1695 Field, SourceLocation(), 1696 SourceLocation(), 1697 MemberInit.takeAs<Expr>(), 1698 SourceLocation()); 1699 return false; 1700 } 1701 1702 if (FieldBaseElementType->isReferenceType()) { 1703 SemaRef.Diag(Constructor->getLocation(), 1704 diag::err_uninitialized_member_in_ctor) 1705 << (int)Constructor->isImplicit() 1706 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1707 << 0 << Field->getDeclName(); 1708 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1709 return true; 1710 } 1711 1712 if (FieldBaseElementType.isConstQualified()) { 1713 SemaRef.Diag(Constructor->getLocation(), 1714 diag::err_uninitialized_member_in_ctor) 1715 << (int)Constructor->isImplicit() 1716 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1717 << 1 << Field->getDeclName(); 1718 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1719 return true; 1720 } 1721 1722 // Nothing to initialize. 1723 CXXMemberInit = 0; 1724 return false; 1725} 1726 1727namespace { 1728struct BaseAndFieldInfo { 1729 Sema &S; 1730 CXXConstructorDecl *Ctor; 1731 bool AnyErrorsInInits; 1732 ImplicitInitializerKind IIK; 1733 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1734 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1735 1736 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1737 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1738 // FIXME: Handle implicit move constructors. 1739 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1740 IIK = IIK_Copy; 1741 else 1742 IIK = IIK_Default; 1743 } 1744}; 1745} 1746 1747static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1748 FieldDecl *Top, FieldDecl *Field) { 1749 1750 // Overwhelmingly common case: we have a direct initializer for this field. 1751 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1752 Info.AllToInit.push_back(Init); 1753 1754 if (Field != Top) { 1755 Init->setMember(Top); 1756 Init->setAnonUnionMember(Field); 1757 } 1758 return false; 1759 } 1760 1761 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1762 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1763 assert(FieldClassType && "anonymous struct/union without record type"); 1764 1765 // Walk through the members, tying in any initializers for fields 1766 // we find. The earlier semantic checks should prevent redundant 1767 // initialization of union members, given the requirement that 1768 // union members never have non-trivial default constructors. 1769 1770 // TODO: in C++0x, it might be legal to have union members with 1771 // non-trivial default constructors in unions. Revise this 1772 // implementation then with the appropriate semantics. 1773 CXXRecordDecl *FieldClassDecl 1774 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1775 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1776 EA = FieldClassDecl->field_end(); FA != EA; FA++) 1777 if (CollectFieldInitializer(Info, Top, *FA)) 1778 return true; 1779 } 1780 1781 // Don't try to build an implicit initializer if there were semantic 1782 // errors in any of the initializers (and therefore we might be 1783 // missing some that the user actually wrote). 1784 if (Info.AnyErrorsInInits) 1785 return false; 1786 1787 CXXBaseOrMemberInitializer *Init = 0; 1788 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1789 return true; 1790 1791 // If the member doesn't need to be initialized, Init will still be null. 1792 if (!Init) return false; 1793 1794 Info.AllToInit.push_back(Init); 1795 if (Top != Field) { 1796 Init->setMember(Top); 1797 Init->setAnonUnionMember(Field); 1798 } 1799 return false; 1800} 1801 1802bool 1803Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1804 CXXBaseOrMemberInitializer **Initializers, 1805 unsigned NumInitializers, 1806 bool AnyErrors) { 1807 if (Constructor->getDeclContext()->isDependentContext()) { 1808 // Just store the initializers as written, they will be checked during 1809 // instantiation. 1810 if (NumInitializers > 0) { 1811 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1812 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1813 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1814 memcpy(baseOrMemberInitializers, Initializers, 1815 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1816 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1817 } 1818 1819 return false; 1820 } 1821 1822 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1823 1824 // We need to build the initializer AST according to order of construction 1825 // and not what user specified in the Initializers list. 1826 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1827 if (!ClassDecl) 1828 return true; 1829 1830 bool HadError = false; 1831 1832 for (unsigned i = 0; i < NumInitializers; i++) { 1833 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1834 1835 if (Member->isBaseInitializer()) 1836 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1837 else 1838 Info.AllBaseFields[Member->getMember()] = Member; 1839 } 1840 1841 // Keep track of the direct virtual bases. 1842 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1843 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1844 E = ClassDecl->bases_end(); I != E; ++I) { 1845 if (I->isVirtual()) 1846 DirectVBases.insert(I); 1847 } 1848 1849 // Push virtual bases before others. 1850 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1851 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1852 1853 if (CXXBaseOrMemberInitializer *Value 1854 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1855 Info.AllToInit.push_back(Value); 1856 } else if (!AnyErrors) { 1857 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1858 CXXBaseOrMemberInitializer *CXXBaseInit; 1859 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1860 VBase, IsInheritedVirtualBase, 1861 CXXBaseInit)) { 1862 HadError = true; 1863 continue; 1864 } 1865 1866 Info.AllToInit.push_back(CXXBaseInit); 1867 } 1868 } 1869 1870 // Non-virtual bases. 1871 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1872 E = ClassDecl->bases_end(); Base != E; ++Base) { 1873 // Virtuals are in the virtual base list and already constructed. 1874 if (Base->isVirtual()) 1875 continue; 1876 1877 if (CXXBaseOrMemberInitializer *Value 1878 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1879 Info.AllToInit.push_back(Value); 1880 } else if (!AnyErrors) { 1881 CXXBaseOrMemberInitializer *CXXBaseInit; 1882 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1883 Base, /*IsInheritedVirtualBase=*/false, 1884 CXXBaseInit)) { 1885 HadError = true; 1886 continue; 1887 } 1888 1889 Info.AllToInit.push_back(CXXBaseInit); 1890 } 1891 } 1892 1893 // Fields. 1894 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1895 E = ClassDecl->field_end(); Field != E; ++Field) 1896 if (CollectFieldInitializer(Info, *Field, *Field)) 1897 HadError = true; 1898 1899 NumInitializers = Info.AllToInit.size(); 1900 if (NumInitializers > 0) { 1901 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1902 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1903 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1904 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1905 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1906 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1907 1908 // Constructors implicitly reference the base and member 1909 // destructors. 1910 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1911 Constructor->getParent()); 1912 } 1913 1914 return HadError; 1915} 1916 1917static void *GetKeyForTopLevelField(FieldDecl *Field) { 1918 // For anonymous unions, use the class declaration as the key. 1919 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1920 if (RT->getDecl()->isAnonymousStructOrUnion()) 1921 return static_cast<void *>(RT->getDecl()); 1922 } 1923 return static_cast<void *>(Field); 1924} 1925 1926static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1927 return Context.getCanonicalType(BaseType).getTypePtr(); 1928} 1929 1930static void *GetKeyForMember(ASTContext &Context, 1931 CXXBaseOrMemberInitializer *Member, 1932 bool MemberMaybeAnon = false) { 1933 if (!Member->isMemberInitializer()) 1934 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1935 1936 // For fields injected into the class via declaration of an anonymous union, 1937 // use its anonymous union class declaration as the unique key. 1938 FieldDecl *Field = Member->getMember(); 1939 1940 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1941 // data member of the class. Data member used in the initializer list is 1942 // in AnonUnionMember field. 1943 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1944 Field = Member->getAnonUnionMember(); 1945 1946 // If the field is a member of an anonymous struct or union, our key 1947 // is the anonymous record decl that's a direct child of the class. 1948 RecordDecl *RD = Field->getParent(); 1949 if (RD->isAnonymousStructOrUnion()) { 1950 while (true) { 1951 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1952 if (Parent->isAnonymousStructOrUnion()) 1953 RD = Parent; 1954 else 1955 break; 1956 } 1957 1958 return static_cast<void *>(RD); 1959 } 1960 1961 return static_cast<void *>(Field); 1962} 1963 1964static void 1965DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1966 const CXXConstructorDecl *Constructor, 1967 CXXBaseOrMemberInitializer **Inits, 1968 unsigned NumInits) { 1969 if (Constructor->getDeclContext()->isDependentContext()) 1970 return; 1971 1972 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1973 == Diagnostic::Ignored) 1974 return; 1975 1976 // Build the list of bases and members in the order that they'll 1977 // actually be initialized. The explicit initializers should be in 1978 // this same order but may be missing things. 1979 llvm::SmallVector<const void*, 32> IdealInitKeys; 1980 1981 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1982 1983 // 1. Virtual bases. 1984 for (CXXRecordDecl::base_class_const_iterator VBase = 1985 ClassDecl->vbases_begin(), 1986 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1987 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1988 1989 // 2. Non-virtual bases. 1990 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1991 E = ClassDecl->bases_end(); Base != E; ++Base) { 1992 if (Base->isVirtual()) 1993 continue; 1994 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1995 } 1996 1997 // 3. Direct fields. 1998 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1999 E = ClassDecl->field_end(); Field != E; ++Field) 2000 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2001 2002 unsigned NumIdealInits = IdealInitKeys.size(); 2003 unsigned IdealIndex = 0; 2004 2005 CXXBaseOrMemberInitializer *PrevInit = 0; 2006 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2007 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2008 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2009 2010 // Scan forward to try to find this initializer in the idealized 2011 // initializers list. 2012 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2013 if (InitKey == IdealInitKeys[IdealIndex]) 2014 break; 2015 2016 // If we didn't find this initializer, it must be because we 2017 // scanned past it on a previous iteration. That can only 2018 // happen if we're out of order; emit a warning. 2019 if (IdealIndex == NumIdealInits && PrevInit) { 2020 Sema::SemaDiagnosticBuilder D = 2021 SemaRef.Diag(PrevInit->getSourceLocation(), 2022 diag::warn_initializer_out_of_order); 2023 2024 if (PrevInit->isMemberInitializer()) 2025 D << 0 << PrevInit->getMember()->getDeclName(); 2026 else 2027 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2028 2029 if (Init->isMemberInitializer()) 2030 D << 0 << Init->getMember()->getDeclName(); 2031 else 2032 D << 1 << Init->getBaseClassInfo()->getType(); 2033 2034 // Move back to the initializer's location in the ideal list. 2035 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2036 if (InitKey == IdealInitKeys[IdealIndex]) 2037 break; 2038 2039 assert(IdealIndex != NumIdealInits && 2040 "initializer not found in initializer list"); 2041 } 2042 2043 PrevInit = Init; 2044 } 2045} 2046 2047namespace { 2048bool CheckRedundantInit(Sema &S, 2049 CXXBaseOrMemberInitializer *Init, 2050 CXXBaseOrMemberInitializer *&PrevInit) { 2051 if (!PrevInit) { 2052 PrevInit = Init; 2053 return false; 2054 } 2055 2056 if (FieldDecl *Field = Init->getMember()) 2057 S.Diag(Init->getSourceLocation(), 2058 diag::err_multiple_mem_initialization) 2059 << Field->getDeclName() 2060 << Init->getSourceRange(); 2061 else { 2062 Type *BaseClass = Init->getBaseClass(); 2063 assert(BaseClass && "neither field nor base"); 2064 S.Diag(Init->getSourceLocation(), 2065 diag::err_multiple_base_initialization) 2066 << QualType(BaseClass, 0) 2067 << Init->getSourceRange(); 2068 } 2069 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2070 << 0 << PrevInit->getSourceRange(); 2071 2072 return true; 2073} 2074 2075typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2076typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2077 2078bool CheckRedundantUnionInit(Sema &S, 2079 CXXBaseOrMemberInitializer *Init, 2080 RedundantUnionMap &Unions) { 2081 FieldDecl *Field = Init->getMember(); 2082 RecordDecl *Parent = Field->getParent(); 2083 if (!Parent->isAnonymousStructOrUnion()) 2084 return false; 2085 2086 NamedDecl *Child = Field; 2087 do { 2088 if (Parent->isUnion()) { 2089 UnionEntry &En = Unions[Parent]; 2090 if (En.first && En.first != Child) { 2091 S.Diag(Init->getSourceLocation(), 2092 diag::err_multiple_mem_union_initialization) 2093 << Field->getDeclName() 2094 << Init->getSourceRange(); 2095 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2096 << 0 << En.second->getSourceRange(); 2097 return true; 2098 } else if (!En.first) { 2099 En.first = Child; 2100 En.second = Init; 2101 } 2102 } 2103 2104 Child = Parent; 2105 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2106 } while (Parent->isAnonymousStructOrUnion()); 2107 2108 return false; 2109} 2110} 2111 2112/// ActOnMemInitializers - Handle the member initializers for a constructor. 2113void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2114 SourceLocation ColonLoc, 2115 MemInitTy **meminits, unsigned NumMemInits, 2116 bool AnyErrors) { 2117 if (!ConstructorDecl) 2118 return; 2119 2120 AdjustDeclIfTemplate(ConstructorDecl); 2121 2122 CXXConstructorDecl *Constructor 2123 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2124 2125 if (!Constructor) { 2126 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2127 return; 2128 } 2129 2130 CXXBaseOrMemberInitializer **MemInits = 2131 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2132 2133 // Mapping for the duplicate initializers check. 2134 // For member initializers, this is keyed with a FieldDecl*. 2135 // For base initializers, this is keyed with a Type*. 2136 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2137 2138 // Mapping for the inconsistent anonymous-union initializers check. 2139 RedundantUnionMap MemberUnions; 2140 2141 bool HadError = false; 2142 for (unsigned i = 0; i < NumMemInits; i++) { 2143 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2144 2145 if (Init->isMemberInitializer()) { 2146 FieldDecl *Field = Init->getMember(); 2147 if (CheckRedundantInit(*this, Init, Members[Field]) || 2148 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2149 HadError = true; 2150 } else { 2151 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2152 if (CheckRedundantInit(*this, Init, Members[Key])) 2153 HadError = true; 2154 } 2155 } 2156 2157 if (HadError) 2158 return; 2159 2160 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2161 2162 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2163} 2164 2165void 2166Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2167 CXXRecordDecl *ClassDecl) { 2168 // Ignore dependent contexts. 2169 if (ClassDecl->isDependentContext()) 2170 return; 2171 2172 // FIXME: all the access-control diagnostics are positioned on the 2173 // field/base declaration. That's probably good; that said, the 2174 // user might reasonably want to know why the destructor is being 2175 // emitted, and we currently don't say. 2176 2177 // Non-static data members. 2178 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2179 E = ClassDecl->field_end(); I != E; ++I) { 2180 FieldDecl *Field = *I; 2181 if (Field->isInvalidDecl()) 2182 continue; 2183 QualType FieldType = Context.getBaseElementType(Field->getType()); 2184 2185 const RecordType* RT = FieldType->getAs<RecordType>(); 2186 if (!RT) 2187 continue; 2188 2189 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2190 if (FieldClassDecl->hasTrivialDestructor()) 2191 continue; 2192 2193 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2194 CheckDestructorAccess(Field->getLocation(), Dtor, 2195 PDiag(diag::err_access_dtor_field) 2196 << Field->getDeclName() 2197 << FieldType); 2198 2199 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2200 } 2201 2202 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2203 2204 // Bases. 2205 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2206 E = ClassDecl->bases_end(); Base != E; ++Base) { 2207 // Bases are always records in a well-formed non-dependent class. 2208 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2209 2210 // Remember direct virtual bases. 2211 if (Base->isVirtual()) 2212 DirectVirtualBases.insert(RT); 2213 2214 // Ignore trivial destructors. 2215 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2216 if (BaseClassDecl->hasTrivialDestructor()) 2217 continue; 2218 2219 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2220 2221 // FIXME: caret should be on the start of the class name 2222 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2223 PDiag(diag::err_access_dtor_base) 2224 << Base->getType() 2225 << Base->getSourceRange()); 2226 2227 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2228 } 2229 2230 // Virtual bases. 2231 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2232 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2233 2234 // Bases are always records in a well-formed non-dependent class. 2235 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2236 2237 // Ignore direct virtual bases. 2238 if (DirectVirtualBases.count(RT)) 2239 continue; 2240 2241 // Ignore trivial destructors. 2242 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2243 if (BaseClassDecl->hasTrivialDestructor()) 2244 continue; 2245 2246 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2247 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2248 PDiag(diag::err_access_dtor_vbase) 2249 << VBase->getType()); 2250 2251 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2252 } 2253} 2254 2255void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2256 if (!CDtorDecl) 2257 return; 2258 2259 if (CXXConstructorDecl *Constructor 2260 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2261 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2262} 2263 2264bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2265 unsigned DiagID, AbstractDiagSelID SelID, 2266 const CXXRecordDecl *CurrentRD) { 2267 if (SelID == -1) 2268 return RequireNonAbstractType(Loc, T, 2269 PDiag(DiagID), CurrentRD); 2270 else 2271 return RequireNonAbstractType(Loc, T, 2272 PDiag(DiagID) << SelID, CurrentRD); 2273} 2274 2275bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2276 const PartialDiagnostic &PD, 2277 const CXXRecordDecl *CurrentRD) { 2278 if (!getLangOptions().CPlusPlus) 2279 return false; 2280 2281 if (const ArrayType *AT = Context.getAsArrayType(T)) 2282 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2283 CurrentRD); 2284 2285 if (const PointerType *PT = T->getAs<PointerType>()) { 2286 // Find the innermost pointer type. 2287 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2288 PT = T; 2289 2290 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2291 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2292 } 2293 2294 const RecordType *RT = T->getAs<RecordType>(); 2295 if (!RT) 2296 return false; 2297 2298 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2299 2300 if (CurrentRD && CurrentRD != RD) 2301 return false; 2302 2303 // FIXME: is this reasonable? It matches current behavior, but.... 2304 if (!RD->getDefinition()) 2305 return false; 2306 2307 if (!RD->isAbstract()) 2308 return false; 2309 2310 Diag(Loc, PD) << RD->getDeclName(); 2311 2312 // Check if we've already emitted the list of pure virtual functions for this 2313 // class. 2314 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2315 return true; 2316 2317 CXXFinalOverriderMap FinalOverriders; 2318 RD->getFinalOverriders(FinalOverriders); 2319 2320 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2321 MEnd = FinalOverriders.end(); 2322 M != MEnd; 2323 ++M) { 2324 for (OverridingMethods::iterator SO = M->second.begin(), 2325 SOEnd = M->second.end(); 2326 SO != SOEnd; ++SO) { 2327 // C++ [class.abstract]p4: 2328 // A class is abstract if it contains or inherits at least one 2329 // pure virtual function for which the final overrider is pure 2330 // virtual. 2331 2332 // 2333 if (SO->second.size() != 1) 2334 continue; 2335 2336 if (!SO->second.front().Method->isPure()) 2337 continue; 2338 2339 Diag(SO->second.front().Method->getLocation(), 2340 diag::note_pure_virtual_function) 2341 << SO->second.front().Method->getDeclName(); 2342 } 2343 } 2344 2345 if (!PureVirtualClassDiagSet) 2346 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2347 PureVirtualClassDiagSet->insert(RD); 2348 2349 return true; 2350} 2351 2352namespace { 2353 class AbstractClassUsageDiagnoser 2354 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2355 Sema &SemaRef; 2356 CXXRecordDecl *AbstractClass; 2357 2358 bool VisitDeclContext(const DeclContext *DC) { 2359 bool Invalid = false; 2360 2361 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2362 E = DC->decls_end(); I != E; ++I) 2363 Invalid |= Visit(*I); 2364 2365 return Invalid; 2366 } 2367 2368 public: 2369 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2370 : SemaRef(SemaRef), AbstractClass(ac) { 2371 Visit(SemaRef.Context.getTranslationUnitDecl()); 2372 } 2373 2374 bool VisitFunctionDecl(const FunctionDecl *FD) { 2375 if (FD->isThisDeclarationADefinition()) { 2376 // No need to do the check if we're in a definition, because it requires 2377 // that the return/param types are complete. 2378 // because that requires 2379 return VisitDeclContext(FD); 2380 } 2381 2382 // Check the return type. 2383 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2384 bool Invalid = 2385 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2386 diag::err_abstract_type_in_decl, 2387 Sema::AbstractReturnType, 2388 AbstractClass); 2389 2390 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2391 E = FD->param_end(); I != E; ++I) { 2392 const ParmVarDecl *VD = *I; 2393 Invalid |= 2394 SemaRef.RequireNonAbstractType(VD->getLocation(), 2395 VD->getOriginalType(), 2396 diag::err_abstract_type_in_decl, 2397 Sema::AbstractParamType, 2398 AbstractClass); 2399 } 2400 2401 return Invalid; 2402 } 2403 2404 bool VisitDecl(const Decl* D) { 2405 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2406 return VisitDeclContext(DC); 2407 2408 return false; 2409 } 2410 }; 2411} 2412 2413/// \brief Perform semantic checks on a class definition that has been 2414/// completing, introducing implicitly-declared members, checking for 2415/// abstract types, etc. 2416void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2417 if (!Record || Record->isInvalidDecl()) 2418 return; 2419 2420 if (!Record->isDependentType()) 2421 AddImplicitlyDeclaredMembersToClass(S, Record); 2422 2423 if (Record->isInvalidDecl()) 2424 return; 2425 2426 // Set access bits correctly on the directly-declared conversions. 2427 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2428 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2429 Convs->setAccess(I, (*I)->getAccess()); 2430 2431 // Determine whether we need to check for final overriders. We do 2432 // this either when there are virtual base classes (in which case we 2433 // may end up finding multiple final overriders for a given virtual 2434 // function) or any of the base classes is abstract (in which case 2435 // we might detect that this class is abstract). 2436 bool CheckFinalOverriders = false; 2437 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2438 !Record->isDependentType()) { 2439 if (Record->getNumVBases()) 2440 CheckFinalOverriders = true; 2441 else if (!Record->isAbstract()) { 2442 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2443 BEnd = Record->bases_end(); 2444 B != BEnd; ++B) { 2445 CXXRecordDecl *BaseDecl 2446 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2447 if (BaseDecl->isAbstract()) { 2448 CheckFinalOverriders = true; 2449 break; 2450 } 2451 } 2452 } 2453 } 2454 2455 if (CheckFinalOverriders) { 2456 CXXFinalOverriderMap FinalOverriders; 2457 Record->getFinalOverriders(FinalOverriders); 2458 2459 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2460 MEnd = FinalOverriders.end(); 2461 M != MEnd; ++M) { 2462 for (OverridingMethods::iterator SO = M->second.begin(), 2463 SOEnd = M->second.end(); 2464 SO != SOEnd; ++SO) { 2465 assert(SO->second.size() > 0 && 2466 "All virtual functions have overridding virtual functions"); 2467 if (SO->second.size() == 1) { 2468 // C++ [class.abstract]p4: 2469 // A class is abstract if it contains or inherits at least one 2470 // pure virtual function for which the final overrider is pure 2471 // virtual. 2472 if (SO->second.front().Method->isPure()) 2473 Record->setAbstract(true); 2474 continue; 2475 } 2476 2477 // C++ [class.virtual]p2: 2478 // In a derived class, if a virtual member function of a base 2479 // class subobject has more than one final overrider the 2480 // program is ill-formed. 2481 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2482 << (NamedDecl *)M->first << Record; 2483 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2484 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2485 OMEnd = SO->second.end(); 2486 OM != OMEnd; ++OM) 2487 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2488 << (NamedDecl *)M->first << OM->Method->getParent(); 2489 2490 Record->setInvalidDecl(); 2491 } 2492 } 2493 } 2494 2495 if (Record->isAbstract() && !Record->isInvalidDecl()) 2496 (void)AbstractClassUsageDiagnoser(*this, Record); 2497 2498 // If this is not an aggregate type and has no user-declared constructor, 2499 // complain about any non-static data members of reference or const scalar 2500 // type, since they will never get initializers. 2501 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2502 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2503 bool Complained = false; 2504 for (RecordDecl::field_iterator F = Record->field_begin(), 2505 FEnd = Record->field_end(); 2506 F != FEnd; ++F) { 2507 if (F->getType()->isReferenceType() || 2508 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2509 if (!Complained) { 2510 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2511 << Record->getTagKind() << Record; 2512 Complained = true; 2513 } 2514 2515 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2516 << F->getType()->isReferenceType() 2517 << F->getDeclName(); 2518 } 2519 } 2520 } 2521 2522 if (Record->isDynamicClass()) 2523 DynamicClasses.push_back(Record); 2524} 2525 2526void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2527 DeclPtrTy TagDecl, 2528 SourceLocation LBrac, 2529 SourceLocation RBrac, 2530 AttributeList *AttrList) { 2531 if (!TagDecl) 2532 return; 2533 2534 AdjustDeclIfTemplate(TagDecl); 2535 2536 ActOnFields(S, RLoc, TagDecl, 2537 (DeclPtrTy*)FieldCollector->getCurFields(), 2538 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2539 2540 CheckCompletedCXXClass(S, 2541 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2542} 2543 2544/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2545/// special functions, such as the default constructor, copy 2546/// constructor, or destructor, to the given C++ class (C++ 2547/// [special]p1). This routine can only be executed just before the 2548/// definition of the class is complete. 2549/// 2550/// The scope, if provided, is the class scope. 2551void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2552 CXXRecordDecl *ClassDecl) { 2553 CanQualType ClassType 2554 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2555 2556 // FIXME: Implicit declarations have exception specifications, which are 2557 // the union of the specifications of the implicitly called functions. 2558 2559 if (!ClassDecl->hasUserDeclaredConstructor()) { 2560 // C++ [class.ctor]p5: 2561 // A default constructor for a class X is a constructor of class X 2562 // that can be called without an argument. If there is no 2563 // user-declared constructor for class X, a default constructor is 2564 // implicitly declared. An implicitly-declared default constructor 2565 // is an inline public member of its class. 2566 DeclarationName Name 2567 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2568 CXXConstructorDecl *DefaultCon = 2569 CXXConstructorDecl::Create(Context, ClassDecl, 2570 ClassDecl->getLocation(), Name, 2571 Context.getFunctionType(Context.VoidTy, 2572 0, 0, false, 0, 2573 /*FIXME*/false, false, 2574 0, 0, 2575 FunctionType::ExtInfo()), 2576 /*TInfo=*/0, 2577 /*isExplicit=*/false, 2578 /*isInline=*/true, 2579 /*isImplicitlyDeclared=*/true); 2580 DefaultCon->setAccess(AS_public); 2581 DefaultCon->setImplicit(); 2582 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2583 if (S) 2584 PushOnScopeChains(DefaultCon, S, true); 2585 else 2586 ClassDecl->addDecl(DefaultCon); 2587 } 2588 2589 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2590 // C++ [class.copy]p4: 2591 // If the class definition does not explicitly declare a copy 2592 // constructor, one is declared implicitly. 2593 2594 // C++ [class.copy]p5: 2595 // The implicitly-declared copy constructor for a class X will 2596 // have the form 2597 // 2598 // X::X(const X&) 2599 // 2600 // if 2601 bool HasConstCopyConstructor = true; 2602 2603 // -- each direct or virtual base class B of X has a copy 2604 // constructor whose first parameter is of type const B& or 2605 // const volatile B&, and 2606 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2607 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2608 const CXXRecordDecl *BaseClassDecl 2609 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2610 HasConstCopyConstructor 2611 = BaseClassDecl->hasConstCopyConstructor(Context); 2612 } 2613 2614 // -- for all the nonstatic data members of X that are of a 2615 // class type M (or array thereof), each such class type 2616 // has a copy constructor whose first parameter is of type 2617 // const M& or const volatile M&. 2618 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2619 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2620 ++Field) { 2621 QualType FieldType = (*Field)->getType(); 2622 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2623 FieldType = Array->getElementType(); 2624 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2625 const CXXRecordDecl *FieldClassDecl 2626 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2627 HasConstCopyConstructor 2628 = FieldClassDecl->hasConstCopyConstructor(Context); 2629 } 2630 } 2631 2632 // Otherwise, the implicitly declared copy constructor will have 2633 // the form 2634 // 2635 // X::X(X&) 2636 QualType ArgType = ClassType; 2637 if (HasConstCopyConstructor) 2638 ArgType = ArgType.withConst(); 2639 ArgType = Context.getLValueReferenceType(ArgType); 2640 2641 // An implicitly-declared copy constructor is an inline public 2642 // member of its class. 2643 DeclarationName Name 2644 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2645 CXXConstructorDecl *CopyConstructor 2646 = CXXConstructorDecl::Create(Context, ClassDecl, 2647 ClassDecl->getLocation(), Name, 2648 Context.getFunctionType(Context.VoidTy, 2649 &ArgType, 1, 2650 false, 0, 2651 /*FIXME: hasExceptionSpec*/false, 2652 false, 0, 0, 2653 FunctionType::ExtInfo()), 2654 /*TInfo=*/0, 2655 /*isExplicit=*/false, 2656 /*isInline=*/true, 2657 /*isImplicitlyDeclared=*/true); 2658 CopyConstructor->setAccess(AS_public); 2659 CopyConstructor->setImplicit(); 2660 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2661 2662 // Add the parameter to the constructor. 2663 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2664 ClassDecl->getLocation(), 2665 /*IdentifierInfo=*/0, 2666 ArgType, /*TInfo=*/0, 2667 VarDecl::None, 2668 VarDecl::None, 0); 2669 CopyConstructor->setParams(&FromParam, 1); 2670 if (S) 2671 PushOnScopeChains(CopyConstructor, S, true); 2672 else 2673 ClassDecl->addDecl(CopyConstructor); 2674 } 2675 2676 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2677 // Note: The following rules are largely analoguous to the copy 2678 // constructor rules. Note that virtual bases are not taken into account 2679 // for determining the argument type of the operator. Note also that 2680 // operators taking an object instead of a reference are allowed. 2681 // 2682 // C++ [class.copy]p10: 2683 // If the class definition does not explicitly declare a copy 2684 // assignment operator, one is declared implicitly. 2685 // The implicitly-defined copy assignment operator for a class X 2686 // will have the form 2687 // 2688 // X& X::operator=(const X&) 2689 // 2690 // if 2691 bool HasConstCopyAssignment = true; 2692 2693 // -- each direct base class B of X has a copy assignment operator 2694 // whose parameter is of type const B&, const volatile B& or B, 2695 // and 2696 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2697 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2698 assert(!Base->getType()->isDependentType() && 2699 "Cannot generate implicit members for class with dependent bases."); 2700 const CXXRecordDecl *BaseClassDecl 2701 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2702 const CXXMethodDecl *MD = 0; 2703 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2704 MD); 2705 } 2706 2707 // -- for all the nonstatic data members of X that are of a class 2708 // type M (or array thereof), each such class type has a copy 2709 // assignment operator whose parameter is of type const M&, 2710 // const volatile M& or M. 2711 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2712 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2713 ++Field) { 2714 QualType FieldType = (*Field)->getType(); 2715 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2716 FieldType = Array->getElementType(); 2717 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2718 const CXXRecordDecl *FieldClassDecl 2719 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2720 const CXXMethodDecl *MD = 0; 2721 HasConstCopyAssignment 2722 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2723 } 2724 } 2725 2726 // Otherwise, the implicitly declared copy assignment operator will 2727 // have the form 2728 // 2729 // X& X::operator=(X&) 2730 QualType ArgType = ClassType; 2731 QualType RetType = Context.getLValueReferenceType(ArgType); 2732 if (HasConstCopyAssignment) 2733 ArgType = ArgType.withConst(); 2734 ArgType = Context.getLValueReferenceType(ArgType); 2735 2736 // An implicitly-declared copy assignment operator is an inline public 2737 // member of its class. 2738 DeclarationName Name = 2739 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2740 CXXMethodDecl *CopyAssignment = 2741 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2742 Context.getFunctionType(RetType, &ArgType, 1, 2743 false, 0, 2744 /*FIXME: hasExceptionSpec*/false, 2745 false, 0, 0, 2746 FunctionType::ExtInfo()), 2747 /*TInfo=*/0, /*isStatic=*/false, 2748 /*StorageClassAsWritten=*/FunctionDecl::None, 2749 /*isInline=*/true); 2750 CopyAssignment->setAccess(AS_public); 2751 CopyAssignment->setImplicit(); 2752 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2753 CopyAssignment->setCopyAssignment(true); 2754 2755 // Add the parameter to the operator. 2756 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2757 ClassDecl->getLocation(), 2758 /*Id=*/0, 2759 ArgType, /*TInfo=*/0, 2760 VarDecl::None, 2761 VarDecl::None, 0); 2762 CopyAssignment->setParams(&FromParam, 1); 2763 2764 // Don't call addedAssignmentOperator. There is no way to distinguish an 2765 // implicit from an explicit assignment operator. 2766 if (S) 2767 PushOnScopeChains(CopyAssignment, S, true); 2768 else 2769 ClassDecl->addDecl(CopyAssignment); 2770 AddOverriddenMethods(ClassDecl, CopyAssignment); 2771 } 2772 2773 if (!ClassDecl->hasUserDeclaredDestructor()) { 2774 // C++ [class.dtor]p2: 2775 // If a class has no user-declared destructor, a destructor is 2776 // declared implicitly. An implicitly-declared destructor is an 2777 // inline public member of its class. 2778 QualType Ty = Context.getFunctionType(Context.VoidTy, 2779 0, 0, false, 0, 2780 /*FIXME: hasExceptionSpec*/false, 2781 false, 0, 0, FunctionType::ExtInfo()); 2782 2783 DeclarationName Name 2784 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2785 CXXDestructorDecl *Destructor 2786 = CXXDestructorDecl::Create(Context, ClassDecl, 2787 ClassDecl->getLocation(), Name, Ty, 2788 /*isInline=*/true, 2789 /*isImplicitlyDeclared=*/true); 2790 Destructor->setAccess(AS_public); 2791 Destructor->setImplicit(); 2792 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2793 if (S) 2794 PushOnScopeChains(Destructor, S, true); 2795 else 2796 ClassDecl->addDecl(Destructor); 2797 2798 // This could be uniqued if it ever proves significant. 2799 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2800 2801 AddOverriddenMethods(ClassDecl, Destructor); 2802 } 2803} 2804 2805void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2806 Decl *D = TemplateD.getAs<Decl>(); 2807 if (!D) 2808 return; 2809 2810 TemplateParameterList *Params = 0; 2811 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2812 Params = Template->getTemplateParameters(); 2813 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2814 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2815 Params = PartialSpec->getTemplateParameters(); 2816 else 2817 return; 2818 2819 for (TemplateParameterList::iterator Param = Params->begin(), 2820 ParamEnd = Params->end(); 2821 Param != ParamEnd; ++Param) { 2822 NamedDecl *Named = cast<NamedDecl>(*Param); 2823 if (Named->getDeclName()) { 2824 S->AddDecl(DeclPtrTy::make(Named)); 2825 IdResolver.AddDecl(Named); 2826 } 2827 } 2828} 2829 2830void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2831 if (!RecordD) return; 2832 AdjustDeclIfTemplate(RecordD); 2833 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2834 PushDeclContext(S, Record); 2835} 2836 2837void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2838 if (!RecordD) return; 2839 PopDeclContext(); 2840} 2841 2842/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2843/// parsing a top-level (non-nested) C++ class, and we are now 2844/// parsing those parts of the given Method declaration that could 2845/// not be parsed earlier (C++ [class.mem]p2), such as default 2846/// arguments. This action should enter the scope of the given 2847/// Method declaration as if we had just parsed the qualified method 2848/// name. However, it should not bring the parameters into scope; 2849/// that will be performed by ActOnDelayedCXXMethodParameter. 2850void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2851} 2852 2853/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2854/// C++ method declaration. We're (re-)introducing the given 2855/// function parameter into scope for use in parsing later parts of 2856/// the method declaration. For example, we could see an 2857/// ActOnParamDefaultArgument event for this parameter. 2858void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2859 if (!ParamD) 2860 return; 2861 2862 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2863 2864 // If this parameter has an unparsed default argument, clear it out 2865 // to make way for the parsed default argument. 2866 if (Param->hasUnparsedDefaultArg()) 2867 Param->setDefaultArg(0); 2868 2869 S->AddDecl(DeclPtrTy::make(Param)); 2870 if (Param->getDeclName()) 2871 IdResolver.AddDecl(Param); 2872} 2873 2874/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2875/// processing the delayed method declaration for Method. The method 2876/// declaration is now considered finished. There may be a separate 2877/// ActOnStartOfFunctionDef action later (not necessarily 2878/// immediately!) for this method, if it was also defined inside the 2879/// class body. 2880void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2881 if (!MethodD) 2882 return; 2883 2884 AdjustDeclIfTemplate(MethodD); 2885 2886 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2887 2888 // Now that we have our default arguments, check the constructor 2889 // again. It could produce additional diagnostics or affect whether 2890 // the class has implicitly-declared destructors, among other 2891 // things. 2892 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2893 CheckConstructor(Constructor); 2894 2895 // Check the default arguments, which we may have added. 2896 if (!Method->isInvalidDecl()) 2897 CheckCXXDefaultArguments(Method); 2898} 2899 2900/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2901/// the well-formedness of the constructor declarator @p D with type @p 2902/// R. If there are any errors in the declarator, this routine will 2903/// emit diagnostics and set the invalid bit to true. In any case, the type 2904/// will be updated to reflect a well-formed type for the constructor and 2905/// returned. 2906QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2907 FunctionDecl::StorageClass &SC) { 2908 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2909 2910 // C++ [class.ctor]p3: 2911 // A constructor shall not be virtual (10.3) or static (9.4). A 2912 // constructor can be invoked for a const, volatile or const 2913 // volatile object. A constructor shall not be declared const, 2914 // volatile, or const volatile (9.3.2). 2915 if (isVirtual) { 2916 if (!D.isInvalidType()) 2917 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2918 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2919 << SourceRange(D.getIdentifierLoc()); 2920 D.setInvalidType(); 2921 } 2922 if (SC == FunctionDecl::Static) { 2923 if (!D.isInvalidType()) 2924 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2925 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2926 << SourceRange(D.getIdentifierLoc()); 2927 D.setInvalidType(); 2928 SC = FunctionDecl::None; 2929 } 2930 2931 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2932 if (FTI.TypeQuals != 0) { 2933 if (FTI.TypeQuals & Qualifiers::Const) 2934 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2935 << "const" << SourceRange(D.getIdentifierLoc()); 2936 if (FTI.TypeQuals & Qualifiers::Volatile) 2937 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2938 << "volatile" << SourceRange(D.getIdentifierLoc()); 2939 if (FTI.TypeQuals & Qualifiers::Restrict) 2940 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2941 << "restrict" << SourceRange(D.getIdentifierLoc()); 2942 } 2943 2944 // Rebuild the function type "R" without any type qualifiers (in 2945 // case any of the errors above fired) and with "void" as the 2946 // return type, since constructors don't have return types. We 2947 // *always* have to do this, because GetTypeForDeclarator will 2948 // put in a result type of "int" when none was specified. 2949 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2950 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2951 Proto->getNumArgs(), 2952 Proto->isVariadic(), 0, 2953 Proto->hasExceptionSpec(), 2954 Proto->hasAnyExceptionSpec(), 2955 Proto->getNumExceptions(), 2956 Proto->exception_begin(), 2957 Proto->getExtInfo()); 2958} 2959 2960/// CheckConstructor - Checks a fully-formed constructor for 2961/// well-formedness, issuing any diagnostics required. Returns true if 2962/// the constructor declarator is invalid. 2963void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2964 CXXRecordDecl *ClassDecl 2965 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2966 if (!ClassDecl) 2967 return Constructor->setInvalidDecl(); 2968 2969 // C++ [class.copy]p3: 2970 // A declaration of a constructor for a class X is ill-formed if 2971 // its first parameter is of type (optionally cv-qualified) X and 2972 // either there are no other parameters or else all other 2973 // parameters have default arguments. 2974 if (!Constructor->isInvalidDecl() && 2975 ((Constructor->getNumParams() == 1) || 2976 (Constructor->getNumParams() > 1 && 2977 Constructor->getParamDecl(1)->hasDefaultArg())) && 2978 Constructor->getTemplateSpecializationKind() 2979 != TSK_ImplicitInstantiation) { 2980 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2981 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2982 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2983 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2984 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2985 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2986 2987 // FIXME: Rather that making the constructor invalid, we should endeavor 2988 // to fix the type. 2989 Constructor->setInvalidDecl(); 2990 } 2991 } 2992 2993 // Notify the class that we've added a constructor. In principle we 2994 // don't need to do this for out-of-line declarations; in practice 2995 // we only instantiate the most recent declaration of a method, so 2996 // we have to call this for everything but friends. 2997 if (!Constructor->getFriendObjectKind()) 2998 ClassDecl->addedConstructor(Context, Constructor); 2999} 3000 3001/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 3002/// issuing any diagnostics required. Returns true on error. 3003bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3004 CXXRecordDecl *RD = Destructor->getParent(); 3005 3006 if (Destructor->isVirtual()) { 3007 SourceLocation Loc; 3008 3009 if (!Destructor->isImplicit()) 3010 Loc = Destructor->getLocation(); 3011 else 3012 Loc = RD->getLocation(); 3013 3014 // If we have a virtual destructor, look up the deallocation function 3015 FunctionDecl *OperatorDelete = 0; 3016 DeclarationName Name = 3017 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3018 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3019 return true; 3020 3021 Destructor->setOperatorDelete(OperatorDelete); 3022 } 3023 3024 return false; 3025} 3026 3027static inline bool 3028FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3029 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3030 FTI.ArgInfo[0].Param && 3031 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 3032} 3033 3034/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3035/// the well-formednes of the destructor declarator @p D with type @p 3036/// R. If there are any errors in the declarator, this routine will 3037/// emit diagnostics and set the declarator to invalid. Even if this happens, 3038/// will be updated to reflect a well-formed type for the destructor and 3039/// returned. 3040QualType Sema::CheckDestructorDeclarator(Declarator &D, 3041 FunctionDecl::StorageClass& SC) { 3042 // C++ [class.dtor]p1: 3043 // [...] A typedef-name that names a class is a class-name 3044 // (7.1.3); however, a typedef-name that names a class shall not 3045 // be used as the identifier in the declarator for a destructor 3046 // declaration. 3047 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3048 if (isa<TypedefType>(DeclaratorType)) { 3049 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3050 << DeclaratorType; 3051 D.setInvalidType(); 3052 } 3053 3054 // C++ [class.dtor]p2: 3055 // A destructor is used to destroy objects of its class type. A 3056 // destructor takes no parameters, and no return type can be 3057 // specified for it (not even void). The address of a destructor 3058 // shall not be taken. A destructor shall not be static. A 3059 // destructor can be invoked for a const, volatile or const 3060 // volatile object. A destructor shall not be declared const, 3061 // volatile or const volatile (9.3.2). 3062 if (SC == FunctionDecl::Static) { 3063 if (!D.isInvalidType()) 3064 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3065 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3066 << SourceRange(D.getIdentifierLoc()); 3067 SC = FunctionDecl::None; 3068 D.setInvalidType(); 3069 } 3070 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3071 // Destructors don't have return types, but the parser will 3072 // happily parse something like: 3073 // 3074 // class X { 3075 // float ~X(); 3076 // }; 3077 // 3078 // The return type will be eliminated later. 3079 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3080 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3081 << SourceRange(D.getIdentifierLoc()); 3082 } 3083 3084 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3085 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3086 if (FTI.TypeQuals & Qualifiers::Const) 3087 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3088 << "const" << SourceRange(D.getIdentifierLoc()); 3089 if (FTI.TypeQuals & Qualifiers::Volatile) 3090 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3091 << "volatile" << SourceRange(D.getIdentifierLoc()); 3092 if (FTI.TypeQuals & Qualifiers::Restrict) 3093 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3094 << "restrict" << SourceRange(D.getIdentifierLoc()); 3095 D.setInvalidType(); 3096 } 3097 3098 // Make sure we don't have any parameters. 3099 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3100 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3101 3102 // Delete the parameters. 3103 FTI.freeArgs(); 3104 D.setInvalidType(); 3105 } 3106 3107 // Make sure the destructor isn't variadic. 3108 if (FTI.isVariadic) { 3109 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3110 D.setInvalidType(); 3111 } 3112 3113 // Rebuild the function type "R" without any type qualifiers or 3114 // parameters (in case any of the errors above fired) and with 3115 // "void" as the return type, since destructors don't have return 3116 // types. We *always* have to do this, because GetTypeForDeclarator 3117 // will put in a result type of "int" when none was specified. 3118 // FIXME: Exceptions! 3119 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3120 false, false, 0, 0, FunctionType::ExtInfo()); 3121} 3122 3123/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3124/// well-formednes of the conversion function declarator @p D with 3125/// type @p R. If there are any errors in the declarator, this routine 3126/// will emit diagnostics and return true. Otherwise, it will return 3127/// false. Either way, the type @p R will be updated to reflect a 3128/// well-formed type for the conversion operator. 3129void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3130 FunctionDecl::StorageClass& SC) { 3131 // C++ [class.conv.fct]p1: 3132 // Neither parameter types nor return type can be specified. The 3133 // type of a conversion function (8.3.5) is "function taking no 3134 // parameter returning conversion-type-id." 3135 if (SC == FunctionDecl::Static) { 3136 if (!D.isInvalidType()) 3137 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3138 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3139 << SourceRange(D.getIdentifierLoc()); 3140 D.setInvalidType(); 3141 SC = FunctionDecl::None; 3142 } 3143 3144 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3145 3146 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3147 // Conversion functions don't have return types, but the parser will 3148 // happily parse something like: 3149 // 3150 // class X { 3151 // float operator bool(); 3152 // }; 3153 // 3154 // The return type will be changed later anyway. 3155 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3156 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3157 << SourceRange(D.getIdentifierLoc()); 3158 D.setInvalidType(); 3159 } 3160 3161 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3162 3163 // Make sure we don't have any parameters. 3164 if (Proto->getNumArgs() > 0) { 3165 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3166 3167 // Delete the parameters. 3168 D.getTypeObject(0).Fun.freeArgs(); 3169 D.setInvalidType(); 3170 } else if (Proto->isVariadic()) { 3171 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3172 D.setInvalidType(); 3173 } 3174 3175 // Diagnose "&operator bool()" and other such nonsense. This 3176 // is actually a gcc extension which we don't support. 3177 if (Proto->getResultType() != ConvType) { 3178 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3179 << Proto->getResultType(); 3180 D.setInvalidType(); 3181 ConvType = Proto->getResultType(); 3182 } 3183 3184 // C++ [class.conv.fct]p4: 3185 // The conversion-type-id shall not represent a function type nor 3186 // an array type. 3187 if (ConvType->isArrayType()) { 3188 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3189 ConvType = Context.getPointerType(ConvType); 3190 D.setInvalidType(); 3191 } else if (ConvType->isFunctionType()) { 3192 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3193 ConvType = Context.getPointerType(ConvType); 3194 D.setInvalidType(); 3195 } 3196 3197 // Rebuild the function type "R" without any parameters (in case any 3198 // of the errors above fired) and with the conversion type as the 3199 // return type. 3200 if (D.isInvalidType()) { 3201 R = Context.getFunctionType(ConvType, 0, 0, false, 3202 Proto->getTypeQuals(), 3203 Proto->hasExceptionSpec(), 3204 Proto->hasAnyExceptionSpec(), 3205 Proto->getNumExceptions(), 3206 Proto->exception_begin(), 3207 Proto->getExtInfo()); 3208 } 3209 3210 // C++0x explicit conversion operators. 3211 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3212 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3213 diag::warn_explicit_conversion_functions) 3214 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3215} 3216 3217/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3218/// the declaration of the given C++ conversion function. This routine 3219/// is responsible for recording the conversion function in the C++ 3220/// class, if possible. 3221Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3222 assert(Conversion && "Expected to receive a conversion function declaration"); 3223 3224 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3225 3226 // Make sure we aren't redeclaring the conversion function. 3227 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3228 3229 // C++ [class.conv.fct]p1: 3230 // [...] A conversion function is never used to convert a 3231 // (possibly cv-qualified) object to the (possibly cv-qualified) 3232 // same object type (or a reference to it), to a (possibly 3233 // cv-qualified) base class of that type (or a reference to it), 3234 // or to (possibly cv-qualified) void. 3235 // FIXME: Suppress this warning if the conversion function ends up being a 3236 // virtual function that overrides a virtual function in a base class. 3237 QualType ClassType 3238 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3239 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3240 ConvType = ConvTypeRef->getPointeeType(); 3241 if (ConvType->isRecordType()) { 3242 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3243 if (ConvType == ClassType) 3244 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3245 << ClassType; 3246 else if (IsDerivedFrom(ClassType, ConvType)) 3247 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3248 << ClassType << ConvType; 3249 } else if (ConvType->isVoidType()) { 3250 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3251 << ClassType << ConvType; 3252 } 3253 3254 if (Conversion->getPrimaryTemplate()) { 3255 // ignore specializations 3256 } else if (Conversion->getPreviousDeclaration()) { 3257 if (FunctionTemplateDecl *ConversionTemplate 3258 = Conversion->getDescribedFunctionTemplate()) { 3259 if (ClassDecl->replaceConversion( 3260 ConversionTemplate->getPreviousDeclaration(), 3261 ConversionTemplate)) 3262 return DeclPtrTy::make(ConversionTemplate); 3263 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3264 Conversion)) 3265 return DeclPtrTy::make(Conversion); 3266 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3267 } else if (FunctionTemplateDecl *ConversionTemplate 3268 = Conversion->getDescribedFunctionTemplate()) 3269 ClassDecl->addConversionFunction(ConversionTemplate); 3270 else 3271 ClassDecl->addConversionFunction(Conversion); 3272 3273 return DeclPtrTy::make(Conversion); 3274} 3275 3276//===----------------------------------------------------------------------===// 3277// Namespace Handling 3278//===----------------------------------------------------------------------===// 3279 3280/// ActOnStartNamespaceDef - This is called at the start of a namespace 3281/// definition. 3282Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3283 SourceLocation IdentLoc, 3284 IdentifierInfo *II, 3285 SourceLocation LBrace, 3286 AttributeList *AttrList) { 3287 NamespaceDecl *Namespc = 3288 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3289 Namespc->setLBracLoc(LBrace); 3290 3291 Scope *DeclRegionScope = NamespcScope->getParent(); 3292 3293 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3294 3295 if (II) { 3296 // C++ [namespace.def]p2: 3297 // The identifier in an original-namespace-definition shall not have been 3298 // previously defined in the declarative region in which the 3299 // original-namespace-definition appears. The identifier in an 3300 // original-namespace-definition is the name of the namespace. Subsequently 3301 // in that declarative region, it is treated as an original-namespace-name. 3302 3303 NamedDecl *PrevDecl 3304 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3305 ForRedeclaration); 3306 3307 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3308 // This is an extended namespace definition. 3309 // Attach this namespace decl to the chain of extended namespace 3310 // definitions. 3311 OrigNS->setNextNamespace(Namespc); 3312 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3313 3314 // Remove the previous declaration from the scope. 3315 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3316 IdResolver.RemoveDecl(OrigNS); 3317 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3318 } 3319 } else if (PrevDecl) { 3320 // This is an invalid name redefinition. 3321 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3322 << Namespc->getDeclName(); 3323 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3324 Namespc->setInvalidDecl(); 3325 // Continue on to push Namespc as current DeclContext and return it. 3326 } else if (II->isStr("std") && 3327 CurContext->getLookupContext()->isTranslationUnit()) { 3328 // This is the first "real" definition of the namespace "std", so update 3329 // our cache of the "std" namespace to point at this definition. 3330 if (StdNamespace) { 3331 // We had already defined a dummy namespace "std". Link this new 3332 // namespace definition to the dummy namespace "std". 3333 StdNamespace->setNextNamespace(Namespc); 3334 StdNamespace->setLocation(IdentLoc); 3335 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3336 } 3337 3338 // Make our StdNamespace cache point at the first real definition of the 3339 // "std" namespace. 3340 StdNamespace = Namespc; 3341 } 3342 3343 PushOnScopeChains(Namespc, DeclRegionScope); 3344 } else { 3345 // Anonymous namespaces. 3346 assert(Namespc->isAnonymousNamespace()); 3347 3348 // Link the anonymous namespace into its parent. 3349 NamespaceDecl *PrevDecl; 3350 DeclContext *Parent = CurContext->getLookupContext(); 3351 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3352 PrevDecl = TU->getAnonymousNamespace(); 3353 TU->setAnonymousNamespace(Namespc); 3354 } else { 3355 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3356 PrevDecl = ND->getAnonymousNamespace(); 3357 ND->setAnonymousNamespace(Namespc); 3358 } 3359 3360 // Link the anonymous namespace with its previous declaration. 3361 if (PrevDecl) { 3362 assert(PrevDecl->isAnonymousNamespace()); 3363 assert(!PrevDecl->getNextNamespace()); 3364 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3365 PrevDecl->setNextNamespace(Namespc); 3366 } 3367 3368 CurContext->addDecl(Namespc); 3369 3370 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3371 // behaves as if it were replaced by 3372 // namespace unique { /* empty body */ } 3373 // using namespace unique; 3374 // namespace unique { namespace-body } 3375 // where all occurrences of 'unique' in a translation unit are 3376 // replaced by the same identifier and this identifier differs 3377 // from all other identifiers in the entire program. 3378 3379 // We just create the namespace with an empty name and then add an 3380 // implicit using declaration, just like the standard suggests. 3381 // 3382 // CodeGen enforces the "universally unique" aspect by giving all 3383 // declarations semantically contained within an anonymous 3384 // namespace internal linkage. 3385 3386 if (!PrevDecl) { 3387 UsingDirectiveDecl* UD 3388 = UsingDirectiveDecl::Create(Context, CurContext, 3389 /* 'using' */ LBrace, 3390 /* 'namespace' */ SourceLocation(), 3391 /* qualifier */ SourceRange(), 3392 /* NNS */ NULL, 3393 /* identifier */ SourceLocation(), 3394 Namespc, 3395 /* Ancestor */ CurContext); 3396 UD->setImplicit(); 3397 CurContext->addDecl(UD); 3398 } 3399 } 3400 3401 // Although we could have an invalid decl (i.e. the namespace name is a 3402 // redefinition), push it as current DeclContext and try to continue parsing. 3403 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3404 // for the namespace has the declarations that showed up in that particular 3405 // namespace definition. 3406 PushDeclContext(NamespcScope, Namespc); 3407 return DeclPtrTy::make(Namespc); 3408} 3409 3410/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3411/// is a namespace alias, returns the namespace it points to. 3412static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3413 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3414 return AD->getNamespace(); 3415 return dyn_cast_or_null<NamespaceDecl>(D); 3416} 3417 3418/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3419/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3420void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3421 Decl *Dcl = D.getAs<Decl>(); 3422 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3423 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3424 Namespc->setRBracLoc(RBrace); 3425 PopDeclContext(); 3426} 3427 3428Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3429 SourceLocation UsingLoc, 3430 SourceLocation NamespcLoc, 3431 CXXScopeSpec &SS, 3432 SourceLocation IdentLoc, 3433 IdentifierInfo *NamespcName, 3434 AttributeList *AttrList) { 3435 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3436 assert(NamespcName && "Invalid NamespcName."); 3437 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3438 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3439 3440 UsingDirectiveDecl *UDir = 0; 3441 3442 // Lookup namespace name. 3443 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3444 LookupParsedName(R, S, &SS); 3445 if (R.isAmbiguous()) 3446 return DeclPtrTy(); 3447 3448 if (!R.empty()) { 3449 NamedDecl *Named = R.getFoundDecl(); 3450 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3451 && "expected namespace decl"); 3452 // C++ [namespace.udir]p1: 3453 // A using-directive specifies that the names in the nominated 3454 // namespace can be used in the scope in which the 3455 // using-directive appears after the using-directive. During 3456 // unqualified name lookup (3.4.1), the names appear as if they 3457 // were declared in the nearest enclosing namespace which 3458 // contains both the using-directive and the nominated 3459 // namespace. [Note: in this context, "contains" means "contains 3460 // directly or indirectly". ] 3461 3462 // Find enclosing context containing both using-directive and 3463 // nominated namespace. 3464 NamespaceDecl *NS = getNamespaceDecl(Named); 3465 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3466 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3467 CommonAncestor = CommonAncestor->getParent(); 3468 3469 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3470 SS.getRange(), 3471 (NestedNameSpecifier *)SS.getScopeRep(), 3472 IdentLoc, Named, CommonAncestor); 3473 PushUsingDirective(S, UDir); 3474 } else { 3475 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3476 } 3477 3478 // FIXME: We ignore attributes for now. 3479 delete AttrList; 3480 return DeclPtrTy::make(UDir); 3481} 3482 3483void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3484 // If scope has associated entity, then using directive is at namespace 3485 // or translation unit scope. We add UsingDirectiveDecls, into 3486 // it's lookup structure. 3487 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3488 Ctx->addDecl(UDir); 3489 else 3490 // Otherwise it is block-sope. using-directives will affect lookup 3491 // only to the end of scope. 3492 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3493} 3494 3495 3496Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3497 AccessSpecifier AS, 3498 bool HasUsingKeyword, 3499 SourceLocation UsingLoc, 3500 CXXScopeSpec &SS, 3501 UnqualifiedId &Name, 3502 AttributeList *AttrList, 3503 bool IsTypeName, 3504 SourceLocation TypenameLoc) { 3505 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3506 3507 switch (Name.getKind()) { 3508 case UnqualifiedId::IK_Identifier: 3509 case UnqualifiedId::IK_OperatorFunctionId: 3510 case UnqualifiedId::IK_LiteralOperatorId: 3511 case UnqualifiedId::IK_ConversionFunctionId: 3512 break; 3513 3514 case UnqualifiedId::IK_ConstructorName: 3515 case UnqualifiedId::IK_ConstructorTemplateId: 3516 // C++0x inherited constructors. 3517 if (getLangOptions().CPlusPlus0x) break; 3518 3519 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3520 << SS.getRange(); 3521 return DeclPtrTy(); 3522 3523 case UnqualifiedId::IK_DestructorName: 3524 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3525 << SS.getRange(); 3526 return DeclPtrTy(); 3527 3528 case UnqualifiedId::IK_TemplateId: 3529 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3530 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3531 return DeclPtrTy(); 3532 } 3533 3534 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3535 if (!TargetName) 3536 return DeclPtrTy(); 3537 3538 // Warn about using declarations. 3539 // TODO: store that the declaration was written without 'using' and 3540 // talk about access decls instead of using decls in the 3541 // diagnostics. 3542 if (!HasUsingKeyword) { 3543 UsingLoc = Name.getSourceRange().getBegin(); 3544 3545 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3546 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3547 } 3548 3549 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3550 Name.getSourceRange().getBegin(), 3551 TargetName, AttrList, 3552 /* IsInstantiation */ false, 3553 IsTypeName, TypenameLoc); 3554 if (UD) 3555 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3556 3557 return DeclPtrTy::make(UD); 3558} 3559 3560/// Determines whether to create a using shadow decl for a particular 3561/// decl, given the set of decls existing prior to this using lookup. 3562bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3563 const LookupResult &Previous) { 3564 // Diagnose finding a decl which is not from a base class of the 3565 // current class. We do this now because there are cases where this 3566 // function will silently decide not to build a shadow decl, which 3567 // will pre-empt further diagnostics. 3568 // 3569 // We don't need to do this in C++0x because we do the check once on 3570 // the qualifier. 3571 // 3572 // FIXME: diagnose the following if we care enough: 3573 // struct A { int foo; }; 3574 // struct B : A { using A::foo; }; 3575 // template <class T> struct C : A {}; 3576 // template <class T> struct D : C<T> { using B::foo; } // <--- 3577 // This is invalid (during instantiation) in C++03 because B::foo 3578 // resolves to the using decl in B, which is not a base class of D<T>. 3579 // We can't diagnose it immediately because C<T> is an unknown 3580 // specialization. The UsingShadowDecl in D<T> then points directly 3581 // to A::foo, which will look well-formed when we instantiate. 3582 // The right solution is to not collapse the shadow-decl chain. 3583 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3584 DeclContext *OrigDC = Orig->getDeclContext(); 3585 3586 // Handle enums and anonymous structs. 3587 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3588 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3589 while (OrigRec->isAnonymousStructOrUnion()) 3590 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3591 3592 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3593 if (OrigDC == CurContext) { 3594 Diag(Using->getLocation(), 3595 diag::err_using_decl_nested_name_specifier_is_current_class) 3596 << Using->getNestedNameRange(); 3597 Diag(Orig->getLocation(), diag::note_using_decl_target); 3598 return true; 3599 } 3600 3601 Diag(Using->getNestedNameRange().getBegin(), 3602 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3603 << Using->getTargetNestedNameDecl() 3604 << cast<CXXRecordDecl>(CurContext) 3605 << Using->getNestedNameRange(); 3606 Diag(Orig->getLocation(), diag::note_using_decl_target); 3607 return true; 3608 } 3609 } 3610 3611 if (Previous.empty()) return false; 3612 3613 NamedDecl *Target = Orig; 3614 if (isa<UsingShadowDecl>(Target)) 3615 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3616 3617 // If the target happens to be one of the previous declarations, we 3618 // don't have a conflict. 3619 // 3620 // FIXME: but we might be increasing its access, in which case we 3621 // should redeclare it. 3622 NamedDecl *NonTag = 0, *Tag = 0; 3623 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3624 I != E; ++I) { 3625 NamedDecl *D = (*I)->getUnderlyingDecl(); 3626 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3627 return false; 3628 3629 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3630 } 3631 3632 if (Target->isFunctionOrFunctionTemplate()) { 3633 FunctionDecl *FD; 3634 if (isa<FunctionTemplateDecl>(Target)) 3635 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3636 else 3637 FD = cast<FunctionDecl>(Target); 3638 3639 NamedDecl *OldDecl = 0; 3640 switch (CheckOverload(FD, Previous, OldDecl)) { 3641 case Ovl_Overload: 3642 return false; 3643 3644 case Ovl_NonFunction: 3645 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3646 break; 3647 3648 // We found a decl with the exact signature. 3649 case Ovl_Match: 3650 if (isa<UsingShadowDecl>(OldDecl)) { 3651 // Silently ignore the possible conflict. 3652 return false; 3653 } 3654 3655 // If we're in a record, we want to hide the target, so we 3656 // return true (without a diagnostic) to tell the caller not to 3657 // build a shadow decl. 3658 if (CurContext->isRecord()) 3659 return true; 3660 3661 // If we're not in a record, this is an error. 3662 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3663 break; 3664 } 3665 3666 Diag(Target->getLocation(), diag::note_using_decl_target); 3667 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3668 return true; 3669 } 3670 3671 // Target is not a function. 3672 3673 if (isa<TagDecl>(Target)) { 3674 // No conflict between a tag and a non-tag. 3675 if (!Tag) return false; 3676 3677 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3678 Diag(Target->getLocation(), diag::note_using_decl_target); 3679 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3680 return true; 3681 } 3682 3683 // No conflict between a tag and a non-tag. 3684 if (!NonTag) return false; 3685 3686 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3687 Diag(Target->getLocation(), diag::note_using_decl_target); 3688 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3689 return true; 3690} 3691 3692/// Builds a shadow declaration corresponding to a 'using' declaration. 3693UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3694 UsingDecl *UD, 3695 NamedDecl *Orig) { 3696 3697 // If we resolved to another shadow declaration, just coalesce them. 3698 NamedDecl *Target = Orig; 3699 if (isa<UsingShadowDecl>(Target)) { 3700 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3701 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3702 } 3703 3704 UsingShadowDecl *Shadow 3705 = UsingShadowDecl::Create(Context, CurContext, 3706 UD->getLocation(), UD, Target); 3707 UD->addShadowDecl(Shadow); 3708 3709 if (S) 3710 PushOnScopeChains(Shadow, S); 3711 else 3712 CurContext->addDecl(Shadow); 3713 Shadow->setAccess(UD->getAccess()); 3714 3715 // Register it as a conversion if appropriate. 3716 if (Shadow->getDeclName().getNameKind() 3717 == DeclarationName::CXXConversionFunctionName) 3718 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3719 3720 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3721 Shadow->setInvalidDecl(); 3722 3723 return Shadow; 3724} 3725 3726/// Hides a using shadow declaration. This is required by the current 3727/// using-decl implementation when a resolvable using declaration in a 3728/// class is followed by a declaration which would hide or override 3729/// one or more of the using decl's targets; for example: 3730/// 3731/// struct Base { void foo(int); }; 3732/// struct Derived : Base { 3733/// using Base::foo; 3734/// void foo(int); 3735/// }; 3736/// 3737/// The governing language is C++03 [namespace.udecl]p12: 3738/// 3739/// When a using-declaration brings names from a base class into a 3740/// derived class scope, member functions in the derived class 3741/// override and/or hide member functions with the same name and 3742/// parameter types in a base class (rather than conflicting). 3743/// 3744/// There are two ways to implement this: 3745/// (1) optimistically create shadow decls when they're not hidden 3746/// by existing declarations, or 3747/// (2) don't create any shadow decls (or at least don't make them 3748/// visible) until we've fully parsed/instantiated the class. 3749/// The problem with (1) is that we might have to retroactively remove 3750/// a shadow decl, which requires several O(n) operations because the 3751/// decl structures are (very reasonably) not designed for removal. 3752/// (2) avoids this but is very fiddly and phase-dependent. 3753void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3754 if (Shadow->getDeclName().getNameKind() == 3755 DeclarationName::CXXConversionFunctionName) 3756 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3757 3758 // Remove it from the DeclContext... 3759 Shadow->getDeclContext()->removeDecl(Shadow); 3760 3761 // ...and the scope, if applicable... 3762 if (S) { 3763 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3764 IdResolver.RemoveDecl(Shadow); 3765 } 3766 3767 // ...and the using decl. 3768 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3769 3770 // TODO: complain somehow if Shadow was used. It shouldn't 3771 // be possible for this to happen, because...? 3772} 3773 3774/// Builds a using declaration. 3775/// 3776/// \param IsInstantiation - Whether this call arises from an 3777/// instantiation of an unresolved using declaration. We treat 3778/// the lookup differently for these declarations. 3779NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3780 SourceLocation UsingLoc, 3781 CXXScopeSpec &SS, 3782 SourceLocation IdentLoc, 3783 DeclarationName Name, 3784 AttributeList *AttrList, 3785 bool IsInstantiation, 3786 bool IsTypeName, 3787 SourceLocation TypenameLoc) { 3788 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3789 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3790 3791 // FIXME: We ignore attributes for now. 3792 delete AttrList; 3793 3794 if (SS.isEmpty()) { 3795 Diag(IdentLoc, diag::err_using_requires_qualname); 3796 return 0; 3797 } 3798 3799 // Do the redeclaration lookup in the current scope. 3800 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3801 ForRedeclaration); 3802 Previous.setHideTags(false); 3803 if (S) { 3804 LookupName(Previous, S); 3805 3806 // It is really dumb that we have to do this. 3807 LookupResult::Filter F = Previous.makeFilter(); 3808 while (F.hasNext()) { 3809 NamedDecl *D = F.next(); 3810 if (!isDeclInScope(D, CurContext, S)) 3811 F.erase(); 3812 } 3813 F.done(); 3814 } else { 3815 assert(IsInstantiation && "no scope in non-instantiation"); 3816 assert(CurContext->isRecord() && "scope not record in instantiation"); 3817 LookupQualifiedName(Previous, CurContext); 3818 } 3819 3820 NestedNameSpecifier *NNS = 3821 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3822 3823 // Check for invalid redeclarations. 3824 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3825 return 0; 3826 3827 // Check for bad qualifiers. 3828 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3829 return 0; 3830 3831 DeclContext *LookupContext = computeDeclContext(SS); 3832 NamedDecl *D; 3833 if (!LookupContext) { 3834 if (IsTypeName) { 3835 // FIXME: not all declaration name kinds are legal here 3836 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3837 UsingLoc, TypenameLoc, 3838 SS.getRange(), NNS, 3839 IdentLoc, Name); 3840 } else { 3841 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3842 UsingLoc, SS.getRange(), NNS, 3843 IdentLoc, Name); 3844 } 3845 } else { 3846 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3847 SS.getRange(), UsingLoc, NNS, Name, 3848 IsTypeName); 3849 } 3850 D->setAccess(AS); 3851 CurContext->addDecl(D); 3852 3853 if (!LookupContext) return D; 3854 UsingDecl *UD = cast<UsingDecl>(D); 3855 3856 if (RequireCompleteDeclContext(SS, LookupContext)) { 3857 UD->setInvalidDecl(); 3858 return UD; 3859 } 3860 3861 // Look up the target name. 3862 3863 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3864 3865 // Unlike most lookups, we don't always want to hide tag 3866 // declarations: tag names are visible through the using declaration 3867 // even if hidden by ordinary names, *except* in a dependent context 3868 // where it's important for the sanity of two-phase lookup. 3869 if (!IsInstantiation) 3870 R.setHideTags(false); 3871 3872 LookupQualifiedName(R, LookupContext); 3873 3874 if (R.empty()) { 3875 Diag(IdentLoc, diag::err_no_member) 3876 << Name << LookupContext << SS.getRange(); 3877 UD->setInvalidDecl(); 3878 return UD; 3879 } 3880 3881 if (R.isAmbiguous()) { 3882 UD->setInvalidDecl(); 3883 return UD; 3884 } 3885 3886 if (IsTypeName) { 3887 // If we asked for a typename and got a non-type decl, error out. 3888 if (!R.getAsSingle<TypeDecl>()) { 3889 Diag(IdentLoc, diag::err_using_typename_non_type); 3890 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3891 Diag((*I)->getUnderlyingDecl()->getLocation(), 3892 diag::note_using_decl_target); 3893 UD->setInvalidDecl(); 3894 return UD; 3895 } 3896 } else { 3897 // If we asked for a non-typename and we got a type, error out, 3898 // but only if this is an instantiation of an unresolved using 3899 // decl. Otherwise just silently find the type name. 3900 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3901 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3902 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3903 UD->setInvalidDecl(); 3904 return UD; 3905 } 3906 } 3907 3908 // C++0x N2914 [namespace.udecl]p6: 3909 // A using-declaration shall not name a namespace. 3910 if (R.getAsSingle<NamespaceDecl>()) { 3911 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3912 << SS.getRange(); 3913 UD->setInvalidDecl(); 3914 return UD; 3915 } 3916 3917 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3918 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3919 BuildUsingShadowDecl(S, UD, *I); 3920 } 3921 3922 return UD; 3923} 3924 3925/// Checks that the given using declaration is not an invalid 3926/// redeclaration. Note that this is checking only for the using decl 3927/// itself, not for any ill-formedness among the UsingShadowDecls. 3928bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3929 bool isTypeName, 3930 const CXXScopeSpec &SS, 3931 SourceLocation NameLoc, 3932 const LookupResult &Prev) { 3933 // C++03 [namespace.udecl]p8: 3934 // C++0x [namespace.udecl]p10: 3935 // A using-declaration is a declaration and can therefore be used 3936 // repeatedly where (and only where) multiple declarations are 3937 // allowed. 3938 // 3939 // That's in non-member contexts. 3940 if (!CurContext->getLookupContext()->isRecord()) 3941 return false; 3942 3943 NestedNameSpecifier *Qual 3944 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3945 3946 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3947 NamedDecl *D = *I; 3948 3949 bool DTypename; 3950 NestedNameSpecifier *DQual; 3951 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3952 DTypename = UD->isTypeName(); 3953 DQual = UD->getTargetNestedNameDecl(); 3954 } else if (UnresolvedUsingValueDecl *UD 3955 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3956 DTypename = false; 3957 DQual = UD->getTargetNestedNameSpecifier(); 3958 } else if (UnresolvedUsingTypenameDecl *UD 3959 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3960 DTypename = true; 3961 DQual = UD->getTargetNestedNameSpecifier(); 3962 } else continue; 3963 3964 // using decls differ if one says 'typename' and the other doesn't. 3965 // FIXME: non-dependent using decls? 3966 if (isTypeName != DTypename) continue; 3967 3968 // using decls differ if they name different scopes (but note that 3969 // template instantiation can cause this check to trigger when it 3970 // didn't before instantiation). 3971 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3972 Context.getCanonicalNestedNameSpecifier(DQual)) 3973 continue; 3974 3975 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3976 Diag(D->getLocation(), diag::note_using_decl) << 1; 3977 return true; 3978 } 3979 3980 return false; 3981} 3982 3983 3984/// Checks that the given nested-name qualifier used in a using decl 3985/// in the current context is appropriately related to the current 3986/// scope. If an error is found, diagnoses it and returns true. 3987bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3988 const CXXScopeSpec &SS, 3989 SourceLocation NameLoc) { 3990 DeclContext *NamedContext = computeDeclContext(SS); 3991 3992 if (!CurContext->isRecord()) { 3993 // C++03 [namespace.udecl]p3: 3994 // C++0x [namespace.udecl]p8: 3995 // A using-declaration for a class member shall be a member-declaration. 3996 3997 // If we weren't able to compute a valid scope, it must be a 3998 // dependent class scope. 3999 if (!NamedContext || NamedContext->isRecord()) { 4000 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4001 << SS.getRange(); 4002 return true; 4003 } 4004 4005 // Otherwise, everything is known to be fine. 4006 return false; 4007 } 4008 4009 // The current scope is a record. 4010 4011 // If the named context is dependent, we can't decide much. 4012 if (!NamedContext) { 4013 // FIXME: in C++0x, we can diagnose if we can prove that the 4014 // nested-name-specifier does not refer to a base class, which is 4015 // still possible in some cases. 4016 4017 // Otherwise we have to conservatively report that things might be 4018 // okay. 4019 return false; 4020 } 4021 4022 if (!NamedContext->isRecord()) { 4023 // Ideally this would point at the last name in the specifier, 4024 // but we don't have that level of source info. 4025 Diag(SS.getRange().getBegin(), 4026 diag::err_using_decl_nested_name_specifier_is_not_class) 4027 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4028 return true; 4029 } 4030 4031 if (getLangOptions().CPlusPlus0x) { 4032 // C++0x [namespace.udecl]p3: 4033 // In a using-declaration used as a member-declaration, the 4034 // nested-name-specifier shall name a base class of the class 4035 // being defined. 4036 4037 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4038 cast<CXXRecordDecl>(NamedContext))) { 4039 if (CurContext == NamedContext) { 4040 Diag(NameLoc, 4041 diag::err_using_decl_nested_name_specifier_is_current_class) 4042 << SS.getRange(); 4043 return true; 4044 } 4045 4046 Diag(SS.getRange().getBegin(), 4047 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4048 << (NestedNameSpecifier*) SS.getScopeRep() 4049 << cast<CXXRecordDecl>(CurContext) 4050 << SS.getRange(); 4051 return true; 4052 } 4053 4054 return false; 4055 } 4056 4057 // C++03 [namespace.udecl]p4: 4058 // A using-declaration used as a member-declaration shall refer 4059 // to a member of a base class of the class being defined [etc.]. 4060 4061 // Salient point: SS doesn't have to name a base class as long as 4062 // lookup only finds members from base classes. Therefore we can 4063 // diagnose here only if we can prove that that can't happen, 4064 // i.e. if the class hierarchies provably don't intersect. 4065 4066 // TODO: it would be nice if "definitely valid" results were cached 4067 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4068 // need to be repeated. 4069 4070 struct UserData { 4071 llvm::DenseSet<const CXXRecordDecl*> Bases; 4072 4073 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4074 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4075 Data->Bases.insert(Base); 4076 return true; 4077 } 4078 4079 bool hasDependentBases(const CXXRecordDecl *Class) { 4080 return !Class->forallBases(collect, this); 4081 } 4082 4083 /// Returns true if the base is dependent or is one of the 4084 /// accumulated base classes. 4085 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4086 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4087 return !Data->Bases.count(Base); 4088 } 4089 4090 bool mightShareBases(const CXXRecordDecl *Class) { 4091 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4092 } 4093 }; 4094 4095 UserData Data; 4096 4097 // Returns false if we find a dependent base. 4098 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4099 return false; 4100 4101 // Returns false if the class has a dependent base or if it or one 4102 // of its bases is present in the base set of the current context. 4103 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4104 return false; 4105 4106 Diag(SS.getRange().getBegin(), 4107 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4108 << (NestedNameSpecifier*) SS.getScopeRep() 4109 << cast<CXXRecordDecl>(CurContext) 4110 << SS.getRange(); 4111 4112 return true; 4113} 4114 4115Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4116 SourceLocation NamespaceLoc, 4117 SourceLocation AliasLoc, 4118 IdentifierInfo *Alias, 4119 CXXScopeSpec &SS, 4120 SourceLocation IdentLoc, 4121 IdentifierInfo *Ident) { 4122 4123 // Lookup the namespace name. 4124 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4125 LookupParsedName(R, S, &SS); 4126 4127 // Check if we have a previous declaration with the same name. 4128 NamedDecl *PrevDecl 4129 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4130 ForRedeclaration); 4131 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4132 PrevDecl = 0; 4133 4134 if (PrevDecl) { 4135 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4136 // We already have an alias with the same name that points to the same 4137 // namespace, so don't create a new one. 4138 // FIXME: At some point, we'll want to create the (redundant) 4139 // declaration to maintain better source information. 4140 if (!R.isAmbiguous() && !R.empty() && 4141 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4142 return DeclPtrTy(); 4143 } 4144 4145 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4146 diag::err_redefinition_different_kind; 4147 Diag(AliasLoc, DiagID) << Alias; 4148 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4149 return DeclPtrTy(); 4150 } 4151 4152 if (R.isAmbiguous()) 4153 return DeclPtrTy(); 4154 4155 if (R.empty()) { 4156 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4157 return DeclPtrTy(); 4158 } 4159 4160 NamespaceAliasDecl *AliasDecl = 4161 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4162 Alias, SS.getRange(), 4163 (NestedNameSpecifier *)SS.getScopeRep(), 4164 IdentLoc, R.getFoundDecl()); 4165 4166 PushOnScopeChains(AliasDecl, S); 4167 return DeclPtrTy::make(AliasDecl); 4168} 4169 4170namespace { 4171 /// \brief Scoped object used to handle the state changes required in Sema 4172 /// to implicitly define the body of a C++ member function; 4173 class ImplicitlyDefinedFunctionScope { 4174 Sema &S; 4175 DeclContext *PreviousContext; 4176 4177 public: 4178 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4179 : S(S), PreviousContext(S.CurContext) 4180 { 4181 S.CurContext = Method; 4182 S.PushFunctionScope(); 4183 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4184 } 4185 4186 ~ImplicitlyDefinedFunctionScope() { 4187 S.PopExpressionEvaluationContext(); 4188 S.PopFunctionOrBlockScope(); 4189 S.CurContext = PreviousContext; 4190 } 4191 }; 4192} 4193 4194void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4195 CXXConstructorDecl *Constructor) { 4196 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4197 !Constructor->isUsed()) && 4198 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4199 4200 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4201 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4202 4203 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4204 ErrorTrap Trap(*this); 4205 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4206 Trap.hasErrorOccurred()) { 4207 Diag(CurrentLocation, diag::note_member_synthesized_at) 4208 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4209 Constructor->setInvalidDecl(); 4210 } else { 4211 Constructor->setUsed(); 4212 MarkVTableUsed(CurrentLocation, ClassDecl); 4213 } 4214} 4215 4216void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4217 CXXDestructorDecl *Destructor) { 4218 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4219 "DefineImplicitDestructor - call it for implicit default dtor"); 4220 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4221 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4222 4223 if (Destructor->isInvalidDecl()) 4224 return; 4225 4226 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4227 4228 ErrorTrap Trap(*this); 4229 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4230 Destructor->getParent()); 4231 4232 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4233 Diag(CurrentLocation, diag::note_member_synthesized_at) 4234 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4235 4236 Destructor->setInvalidDecl(); 4237 return; 4238 } 4239 4240 Destructor->setUsed(); 4241 MarkVTableUsed(CurrentLocation, ClassDecl); 4242} 4243 4244/// \brief Builds a statement that copies the given entity from \p From to 4245/// \c To. 4246/// 4247/// This routine is used to copy the members of a class with an 4248/// implicitly-declared copy assignment operator. When the entities being 4249/// copied are arrays, this routine builds for loops to copy them. 4250/// 4251/// \param S The Sema object used for type-checking. 4252/// 4253/// \param Loc The location where the implicit copy is being generated. 4254/// 4255/// \param T The type of the expressions being copied. Both expressions must 4256/// have this type. 4257/// 4258/// \param To The expression we are copying to. 4259/// 4260/// \param From The expression we are copying from. 4261/// 4262/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4263/// Otherwise, it's a non-static member subobject. 4264/// 4265/// \param Depth Internal parameter recording the depth of the recursion. 4266/// 4267/// \returns A statement or a loop that copies the expressions. 4268static Sema::OwningStmtResult 4269BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4270 Sema::OwningExprResult To, Sema::OwningExprResult From, 4271 bool CopyingBaseSubobject, unsigned Depth = 0) { 4272 typedef Sema::OwningStmtResult OwningStmtResult; 4273 typedef Sema::OwningExprResult OwningExprResult; 4274 4275 // C++0x [class.copy]p30: 4276 // Each subobject is assigned in the manner appropriate to its type: 4277 // 4278 // - if the subobject is of class type, the copy assignment operator 4279 // for the class is used (as if by explicit qualification; that is, 4280 // ignoring any possible virtual overriding functions in more derived 4281 // classes); 4282 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4283 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4284 4285 // Look for operator=. 4286 DeclarationName Name 4287 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4288 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4289 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4290 4291 // Filter out any result that isn't a copy-assignment operator. 4292 LookupResult::Filter F = OpLookup.makeFilter(); 4293 while (F.hasNext()) { 4294 NamedDecl *D = F.next(); 4295 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4296 if (Method->isCopyAssignmentOperator()) 4297 continue; 4298 4299 F.erase(); 4300 } 4301 F.done(); 4302 4303 // Suppress the protected check (C++ [class.protected]) for each of the 4304 // assignment operators we found. This strange dance is required when 4305 // we're assigning via a base classes's copy-assignment operator. To 4306 // ensure that we're getting the right base class subobject (without 4307 // ambiguities), we need to cast "this" to that subobject type; to 4308 // ensure that we don't go through the virtual call mechanism, we need 4309 // to qualify the operator= name with the base class (see below). However, 4310 // this means that if the base class has a protected copy assignment 4311 // operator, the protected member access check will fail. So, we 4312 // rewrite "protected" access to "public" access in this case, since we 4313 // know by construction that we're calling from a derived class. 4314 if (CopyingBaseSubobject) { 4315 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4316 L != LEnd; ++L) { 4317 if (L.getAccess() == AS_protected) 4318 L.setAccess(AS_public); 4319 } 4320 } 4321 4322 // Create the nested-name-specifier that will be used to qualify the 4323 // reference to operator=; this is required to suppress the virtual 4324 // call mechanism. 4325 CXXScopeSpec SS; 4326 SS.setRange(Loc); 4327 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4328 T.getTypePtr())); 4329 4330 // Create the reference to operator=. 4331 OwningExprResult OpEqualRef 4332 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4333 /*FirstQualifierInScope=*/0, OpLookup, 4334 /*TemplateArgs=*/0, 4335 /*SuppressQualifierCheck=*/true); 4336 if (OpEqualRef.isInvalid()) 4337 return S.StmtError(); 4338 4339 // Build the call to the assignment operator. 4340 Expr *FromE = From.takeAs<Expr>(); 4341 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4342 OpEqualRef.takeAs<Expr>(), 4343 Loc, &FromE, 1, 0, Loc); 4344 if (Call.isInvalid()) 4345 return S.StmtError(); 4346 4347 return S.Owned(Call.takeAs<Stmt>()); 4348 } 4349 4350 // - if the subobject is of scalar type, the built-in assignment 4351 // operator is used. 4352 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4353 if (!ArrayTy) { 4354 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4355 BinaryOperator::Assign, 4356 To.takeAs<Expr>(), 4357 From.takeAs<Expr>()); 4358 if (Assignment.isInvalid()) 4359 return S.StmtError(); 4360 4361 return S.Owned(Assignment.takeAs<Stmt>()); 4362 } 4363 4364 // - if the subobject is an array, each element is assigned, in the 4365 // manner appropriate to the element type; 4366 4367 // Construct a loop over the array bounds, e.g., 4368 // 4369 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4370 // 4371 // that will copy each of the array elements. 4372 QualType SizeType = S.Context.getSizeType(); 4373 4374 // Create the iteration variable. 4375 IdentifierInfo *IterationVarName = 0; 4376 { 4377 llvm::SmallString<8> Str; 4378 llvm::raw_svector_ostream OS(Str); 4379 OS << "__i" << Depth; 4380 IterationVarName = &S.Context.Idents.get(OS.str()); 4381 } 4382 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4383 IterationVarName, SizeType, 4384 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4385 VarDecl::None, VarDecl::None); 4386 4387 // Initialize the iteration variable to zero. 4388 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4389 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4390 4391 // Create a reference to the iteration variable; we'll use this several 4392 // times throughout. 4393 Expr *IterationVarRef 4394 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4395 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4396 4397 // Create the DeclStmt that holds the iteration variable. 4398 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4399 4400 // Create the comparison against the array bound. 4401 llvm::APInt Upper = ArrayTy->getSize(); 4402 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4403 OwningExprResult Comparison 4404 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4405 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4406 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4407 4408 // Create the pre-increment of the iteration variable. 4409 OwningExprResult Increment 4410 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4411 UnaryOperator::PreInc, 4412 SizeType, Loc)); 4413 4414 // Subscript the "from" and "to" expressions with the iteration variable. 4415 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4416 S.Owned(IterationVarRef->Retain()), 4417 Loc); 4418 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4419 S.Owned(IterationVarRef->Retain()), 4420 Loc); 4421 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4422 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4423 4424 // Build the copy for an individual element of the array. 4425 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4426 ArrayTy->getElementType(), 4427 move(To), move(From), 4428 CopyingBaseSubobject, Depth+1); 4429 if (Copy.isInvalid()) { 4430 InitStmt->Destroy(S.Context); 4431 return S.StmtError(); 4432 } 4433 4434 // Construct the loop that copies all elements of this array. 4435 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4436 S.MakeFullExpr(Comparison), 4437 Sema::DeclPtrTy(), 4438 S.MakeFullExpr(Increment), 4439 Loc, move(Copy)); 4440} 4441 4442void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4443 CXXMethodDecl *CopyAssignOperator) { 4444 assert((CopyAssignOperator->isImplicit() && 4445 CopyAssignOperator->isOverloadedOperator() && 4446 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4447 !CopyAssignOperator->isUsed()) && 4448 "DefineImplicitCopyAssignment called for wrong function"); 4449 4450 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4451 4452 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4453 CopyAssignOperator->setInvalidDecl(); 4454 return; 4455 } 4456 4457 CopyAssignOperator->setUsed(); 4458 4459 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4460 ErrorTrap Trap(*this); 4461 4462 // C++0x [class.copy]p30: 4463 // The implicitly-defined or explicitly-defaulted copy assignment operator 4464 // for a non-union class X performs memberwise copy assignment of its 4465 // subobjects. The direct base classes of X are assigned first, in the 4466 // order of their declaration in the base-specifier-list, and then the 4467 // immediate non-static data members of X are assigned, in the order in 4468 // which they were declared in the class definition. 4469 4470 // The statements that form the synthesized function body. 4471 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4472 4473 // The parameter for the "other" object, which we are copying from. 4474 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4475 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4476 QualType OtherRefType = Other->getType(); 4477 if (const LValueReferenceType *OtherRef 4478 = OtherRefType->getAs<LValueReferenceType>()) { 4479 OtherRefType = OtherRef->getPointeeType(); 4480 OtherQuals = OtherRefType.getQualifiers(); 4481 } 4482 4483 // Our location for everything implicitly-generated. 4484 SourceLocation Loc = CopyAssignOperator->getLocation(); 4485 4486 // Construct a reference to the "other" object. We'll be using this 4487 // throughout the generated ASTs. 4488 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4489 assert(OtherRef && "Reference to parameter cannot fail!"); 4490 4491 // Construct the "this" pointer. We'll be using this throughout the generated 4492 // ASTs. 4493 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4494 assert(This && "Reference to this cannot fail!"); 4495 4496 // Assign base classes. 4497 bool Invalid = false; 4498 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4499 E = ClassDecl->bases_end(); Base != E; ++Base) { 4500 // Form the assignment: 4501 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4502 QualType BaseType = Base->getType().getUnqualifiedType(); 4503 CXXRecordDecl *BaseClassDecl = 0; 4504 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4505 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4506 else { 4507 Invalid = true; 4508 continue; 4509 } 4510 4511 // Construct the "from" expression, which is an implicit cast to the 4512 // appropriately-qualified base type. 4513 Expr *From = OtherRef->Retain(); 4514 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4515 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4516 CXXBaseSpecifierArray(Base)); 4517 4518 // Dereference "this". 4519 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4520 Owned(This->Retain())); 4521 4522 // Implicitly cast "this" to the appropriately-qualified base type. 4523 Expr *ToE = To.takeAs<Expr>(); 4524 ImpCastExprToType(ToE, 4525 Context.getCVRQualifiedType(BaseType, 4526 CopyAssignOperator->getTypeQualifiers()), 4527 CastExpr::CK_UncheckedDerivedToBase, 4528 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4529 To = Owned(ToE); 4530 4531 // Build the copy. 4532 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4533 move(To), Owned(From), 4534 /*CopyingBaseSubobject=*/true); 4535 if (Copy.isInvalid()) { 4536 Diag(CurrentLocation, diag::note_member_synthesized_at) 4537 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4538 CopyAssignOperator->setInvalidDecl(); 4539 return; 4540 } 4541 4542 // Success! Record the copy. 4543 Statements.push_back(Copy.takeAs<Expr>()); 4544 } 4545 4546 // \brief Reference to the __builtin_memcpy function. 4547 Expr *BuiltinMemCpyRef = 0; 4548 4549 // Assign non-static members. 4550 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4551 FieldEnd = ClassDecl->field_end(); 4552 Field != FieldEnd; ++Field) { 4553 // Check for members of reference type; we can't copy those. 4554 if (Field->getType()->isReferenceType()) { 4555 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4556 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4557 Diag(Field->getLocation(), diag::note_declared_at); 4558 Diag(CurrentLocation, diag::note_member_synthesized_at) 4559 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4560 Invalid = true; 4561 continue; 4562 } 4563 4564 // Check for members of const-qualified, non-class type. 4565 QualType BaseType = Context.getBaseElementType(Field->getType()); 4566 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4567 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4568 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4569 Diag(Field->getLocation(), diag::note_declared_at); 4570 Diag(CurrentLocation, diag::note_member_synthesized_at) 4571 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4572 Invalid = true; 4573 continue; 4574 } 4575 4576 QualType FieldType = Field->getType().getNonReferenceType(); 4577 4578 // Build references to the field in the object we're copying from and to. 4579 CXXScopeSpec SS; // Intentionally empty 4580 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4581 LookupMemberName); 4582 MemberLookup.addDecl(*Field); 4583 MemberLookup.resolveKind(); 4584 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4585 OtherRefType, 4586 Loc, /*IsArrow=*/false, 4587 SS, 0, MemberLookup, 0); 4588 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4589 This->getType(), 4590 Loc, /*IsArrow=*/true, 4591 SS, 0, MemberLookup, 0); 4592 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4593 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4594 4595 // If the field should be copied with __builtin_memcpy rather than via 4596 // explicit assignments, do so. This optimization only applies for arrays 4597 // of scalars and arrays of class type with trivial copy-assignment 4598 // operators. 4599 if (FieldType->isArrayType() && 4600 (!BaseType->isRecordType() || 4601 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4602 ->hasTrivialCopyAssignment())) { 4603 // Compute the size of the memory buffer to be copied. 4604 QualType SizeType = Context.getSizeType(); 4605 llvm::APInt Size(Context.getTypeSize(SizeType), 4606 Context.getTypeSizeInChars(BaseType).getQuantity()); 4607 for (const ConstantArrayType *Array 4608 = Context.getAsConstantArrayType(FieldType); 4609 Array; 4610 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4611 llvm::APInt ArraySize = Array->getSize(); 4612 ArraySize.zextOrTrunc(Size.getBitWidth()); 4613 Size *= ArraySize; 4614 } 4615 4616 // Take the address of the field references for "from" and "to". 4617 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4618 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4619 4620 // Create a reference to the __builtin_memcpy builtin function. 4621 if (!BuiltinMemCpyRef) { 4622 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4623 LookupOrdinaryName); 4624 LookupName(R, TUScope, true); 4625 4626 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4627 if (!BuiltinMemCpy) { 4628 // Something went horribly wrong earlier, and we will have complained 4629 // about it. 4630 Invalid = true; 4631 continue; 4632 } 4633 4634 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4635 BuiltinMemCpy->getType(), 4636 Loc, 0).takeAs<Expr>(); 4637 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4638 } 4639 4640 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4641 CallArgs.push_back(To.takeAs<Expr>()); 4642 CallArgs.push_back(From.takeAs<Expr>()); 4643 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4644 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4645 Commas.push_back(Loc); 4646 Commas.push_back(Loc); 4647 OwningExprResult Call = ActOnCallExpr(/*Scope=*/0, 4648 Owned(BuiltinMemCpyRef->Retain()), 4649 Loc, move_arg(CallArgs), 4650 Commas.data(), Loc); 4651 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4652 Statements.push_back(Call.takeAs<Expr>()); 4653 continue; 4654 } 4655 4656 // Build the copy of this field. 4657 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4658 move(To), move(From), 4659 /*CopyingBaseSubobject=*/false); 4660 if (Copy.isInvalid()) { 4661 Diag(CurrentLocation, diag::note_member_synthesized_at) 4662 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4663 CopyAssignOperator->setInvalidDecl(); 4664 return; 4665 } 4666 4667 // Success! Record the copy. 4668 Statements.push_back(Copy.takeAs<Stmt>()); 4669 } 4670 4671 if (!Invalid) { 4672 // Add a "return *this;" 4673 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4674 Owned(This->Retain())); 4675 4676 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4677 if (Return.isInvalid()) 4678 Invalid = true; 4679 else { 4680 Statements.push_back(Return.takeAs<Stmt>()); 4681 4682 if (Trap.hasErrorOccurred()) { 4683 Diag(CurrentLocation, diag::note_member_synthesized_at) 4684 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4685 Invalid = true; 4686 } 4687 } 4688 } 4689 4690 if (Invalid) { 4691 CopyAssignOperator->setInvalidDecl(); 4692 return; 4693 } 4694 4695 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4696 /*isStmtExpr=*/false); 4697 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4698 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4699} 4700 4701void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4702 CXXConstructorDecl *CopyConstructor, 4703 unsigned TypeQuals) { 4704 assert((CopyConstructor->isImplicit() && 4705 CopyConstructor->isCopyConstructor(TypeQuals) && 4706 !CopyConstructor->isUsed()) && 4707 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4708 4709 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4710 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4711 4712 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4713 ErrorTrap Trap(*this); 4714 4715 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4716 Trap.hasErrorOccurred()) { 4717 Diag(CurrentLocation, diag::note_member_synthesized_at) 4718 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4719 CopyConstructor->setInvalidDecl(); 4720 } else { 4721 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4722 CopyConstructor->getLocation(), 4723 MultiStmtArg(*this, 0, 0), 4724 /*isStmtExpr=*/false) 4725 .takeAs<Stmt>()); 4726 } 4727 4728 CopyConstructor->setUsed(); 4729} 4730 4731Sema::OwningExprResult 4732Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4733 CXXConstructorDecl *Constructor, 4734 MultiExprArg ExprArgs, 4735 bool RequiresZeroInit, 4736 CXXConstructExpr::ConstructionKind ConstructKind) { 4737 bool Elidable = false; 4738 4739 // C++0x [class.copy]p34: 4740 // When certain criteria are met, an implementation is allowed to 4741 // omit the copy/move construction of a class object, even if the 4742 // copy/move constructor and/or destructor for the object have 4743 // side effects. [...] 4744 // - when a temporary class object that has not been bound to a 4745 // reference (12.2) would be copied/moved to a class object 4746 // with the same cv-unqualified type, the copy/move operation 4747 // can be omitted by constructing the temporary object 4748 // directly into the target of the omitted copy/move 4749 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4750 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4751 Elidable = SubExpr->isTemporaryObject() && 4752 Context.hasSameUnqualifiedType(SubExpr->getType(), 4753 Context.getTypeDeclType(Constructor->getParent())); 4754 } 4755 4756 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4757 Elidable, move(ExprArgs), RequiresZeroInit, 4758 ConstructKind); 4759} 4760 4761/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4762/// including handling of its default argument expressions. 4763Sema::OwningExprResult 4764Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4765 CXXConstructorDecl *Constructor, bool Elidable, 4766 MultiExprArg ExprArgs, 4767 bool RequiresZeroInit, 4768 CXXConstructExpr::ConstructionKind ConstructKind) { 4769 unsigned NumExprs = ExprArgs.size(); 4770 Expr **Exprs = (Expr **)ExprArgs.release(); 4771 4772 MarkDeclarationReferenced(ConstructLoc, Constructor); 4773 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4774 Constructor, Elidable, Exprs, NumExprs, 4775 RequiresZeroInit, ConstructKind)); 4776} 4777 4778bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4779 CXXConstructorDecl *Constructor, 4780 MultiExprArg Exprs) { 4781 OwningExprResult TempResult = 4782 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4783 move(Exprs)); 4784 if (TempResult.isInvalid()) 4785 return true; 4786 4787 Expr *Temp = TempResult.takeAs<Expr>(); 4788 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4789 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4790 VD->setInit(Temp); 4791 4792 return false; 4793} 4794 4795void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4796 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4797 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4798 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 4799 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4800 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4801 CheckDestructorAccess(VD->getLocation(), Destructor, 4802 PDiag(diag::err_access_dtor_var) 4803 << VD->getDeclName() 4804 << VD->getType()); 4805 } 4806} 4807 4808/// AddCXXDirectInitializerToDecl - This action is called immediately after 4809/// ActOnDeclarator, when a C++ direct initializer is present. 4810/// e.g: "int x(1);" 4811void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4812 SourceLocation LParenLoc, 4813 MultiExprArg Exprs, 4814 SourceLocation *CommaLocs, 4815 SourceLocation RParenLoc) { 4816 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4817 Decl *RealDecl = Dcl.getAs<Decl>(); 4818 4819 // If there is no declaration, there was an error parsing it. Just ignore 4820 // the initializer. 4821 if (RealDecl == 0) 4822 return; 4823 4824 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4825 if (!VDecl) { 4826 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4827 RealDecl->setInvalidDecl(); 4828 return; 4829 } 4830 4831 // We will represent direct-initialization similarly to copy-initialization: 4832 // int x(1); -as-> int x = 1; 4833 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4834 // 4835 // Clients that want to distinguish between the two forms, can check for 4836 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4837 // A major benefit is that clients that don't particularly care about which 4838 // exactly form was it (like the CodeGen) can handle both cases without 4839 // special case code. 4840 4841 // C++ 8.5p11: 4842 // The form of initialization (using parentheses or '=') is generally 4843 // insignificant, but does matter when the entity being initialized has a 4844 // class type. 4845 QualType DeclInitType = VDecl->getType(); 4846 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4847 DeclInitType = Context.getBaseElementType(Array); 4848 4849 if (!VDecl->getType()->isDependentType() && 4850 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4851 diag::err_typecheck_decl_incomplete_type)) { 4852 VDecl->setInvalidDecl(); 4853 return; 4854 } 4855 4856 // The variable can not have an abstract class type. 4857 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4858 diag::err_abstract_type_in_decl, 4859 AbstractVariableType)) 4860 VDecl->setInvalidDecl(); 4861 4862 const VarDecl *Def; 4863 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4864 Diag(VDecl->getLocation(), diag::err_redefinition) 4865 << VDecl->getDeclName(); 4866 Diag(Def->getLocation(), diag::note_previous_definition); 4867 VDecl->setInvalidDecl(); 4868 return; 4869 } 4870 4871 // If either the declaration has a dependent type or if any of the 4872 // expressions is type-dependent, we represent the initialization 4873 // via a ParenListExpr for later use during template instantiation. 4874 if (VDecl->getType()->isDependentType() || 4875 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4876 // Let clients know that initialization was done with a direct initializer. 4877 VDecl->setCXXDirectInitializer(true); 4878 4879 // Store the initialization expressions as a ParenListExpr. 4880 unsigned NumExprs = Exprs.size(); 4881 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4882 (Expr **)Exprs.release(), 4883 NumExprs, RParenLoc)); 4884 return; 4885 } 4886 4887 // Capture the variable that is being initialized and the style of 4888 // initialization. 4889 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4890 4891 // FIXME: Poor source location information. 4892 InitializationKind Kind 4893 = InitializationKind::CreateDirect(VDecl->getLocation(), 4894 LParenLoc, RParenLoc); 4895 4896 InitializationSequence InitSeq(*this, Entity, Kind, 4897 (Expr**)Exprs.get(), Exprs.size()); 4898 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4899 if (Result.isInvalid()) { 4900 VDecl->setInvalidDecl(); 4901 return; 4902 } 4903 4904 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4905 VDecl->setInit(Result.takeAs<Expr>()); 4906 VDecl->setCXXDirectInitializer(true); 4907 4908 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4909 FinalizeVarWithDestructor(VDecl, Record); 4910} 4911 4912/// \brief Given a constructor and the set of arguments provided for the 4913/// constructor, convert the arguments and add any required default arguments 4914/// to form a proper call to this constructor. 4915/// 4916/// \returns true if an error occurred, false otherwise. 4917bool 4918Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4919 MultiExprArg ArgsPtr, 4920 SourceLocation Loc, 4921 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4922 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4923 unsigned NumArgs = ArgsPtr.size(); 4924 Expr **Args = (Expr **)ArgsPtr.get(); 4925 4926 const FunctionProtoType *Proto 4927 = Constructor->getType()->getAs<FunctionProtoType>(); 4928 assert(Proto && "Constructor without a prototype?"); 4929 unsigned NumArgsInProto = Proto->getNumArgs(); 4930 4931 // If too few arguments are available, we'll fill in the rest with defaults. 4932 if (NumArgs < NumArgsInProto) 4933 ConvertedArgs.reserve(NumArgsInProto); 4934 else 4935 ConvertedArgs.reserve(NumArgs); 4936 4937 VariadicCallType CallType = 4938 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4939 llvm::SmallVector<Expr *, 8> AllArgs; 4940 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4941 Proto, 0, Args, NumArgs, AllArgs, 4942 CallType); 4943 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4944 ConvertedArgs.push_back(AllArgs[i]); 4945 return Invalid; 4946} 4947 4948static inline bool 4949CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4950 const FunctionDecl *FnDecl) { 4951 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4952 if (isa<NamespaceDecl>(DC)) { 4953 return SemaRef.Diag(FnDecl->getLocation(), 4954 diag::err_operator_new_delete_declared_in_namespace) 4955 << FnDecl->getDeclName(); 4956 } 4957 4958 if (isa<TranslationUnitDecl>(DC) && 4959 FnDecl->getStorageClass() == FunctionDecl::Static) { 4960 return SemaRef.Diag(FnDecl->getLocation(), 4961 diag::err_operator_new_delete_declared_static) 4962 << FnDecl->getDeclName(); 4963 } 4964 4965 return false; 4966} 4967 4968static inline bool 4969CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4970 CanQualType ExpectedResultType, 4971 CanQualType ExpectedFirstParamType, 4972 unsigned DependentParamTypeDiag, 4973 unsigned InvalidParamTypeDiag) { 4974 QualType ResultType = 4975 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4976 4977 // Check that the result type is not dependent. 4978 if (ResultType->isDependentType()) 4979 return SemaRef.Diag(FnDecl->getLocation(), 4980 diag::err_operator_new_delete_dependent_result_type) 4981 << FnDecl->getDeclName() << ExpectedResultType; 4982 4983 // Check that the result type is what we expect. 4984 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4985 return SemaRef.Diag(FnDecl->getLocation(), 4986 diag::err_operator_new_delete_invalid_result_type) 4987 << FnDecl->getDeclName() << ExpectedResultType; 4988 4989 // A function template must have at least 2 parameters. 4990 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4991 return SemaRef.Diag(FnDecl->getLocation(), 4992 diag::err_operator_new_delete_template_too_few_parameters) 4993 << FnDecl->getDeclName(); 4994 4995 // The function decl must have at least 1 parameter. 4996 if (FnDecl->getNumParams() == 0) 4997 return SemaRef.Diag(FnDecl->getLocation(), 4998 diag::err_operator_new_delete_too_few_parameters) 4999 << FnDecl->getDeclName(); 5000 5001 // Check the the first parameter type is not dependent. 5002 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5003 if (FirstParamType->isDependentType()) 5004 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5005 << FnDecl->getDeclName() << ExpectedFirstParamType; 5006 5007 // Check that the first parameter type is what we expect. 5008 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5009 ExpectedFirstParamType) 5010 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5011 << FnDecl->getDeclName() << ExpectedFirstParamType; 5012 5013 return false; 5014} 5015 5016static bool 5017CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5018 // C++ [basic.stc.dynamic.allocation]p1: 5019 // A program is ill-formed if an allocation function is declared in a 5020 // namespace scope other than global scope or declared static in global 5021 // scope. 5022 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5023 return true; 5024 5025 CanQualType SizeTy = 5026 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5027 5028 // C++ [basic.stc.dynamic.allocation]p1: 5029 // The return type shall be void*. The first parameter shall have type 5030 // std::size_t. 5031 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5032 SizeTy, 5033 diag::err_operator_new_dependent_param_type, 5034 diag::err_operator_new_param_type)) 5035 return true; 5036 5037 // C++ [basic.stc.dynamic.allocation]p1: 5038 // The first parameter shall not have an associated default argument. 5039 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5040 return SemaRef.Diag(FnDecl->getLocation(), 5041 diag::err_operator_new_default_arg) 5042 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5043 5044 return false; 5045} 5046 5047static bool 5048CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5049 // C++ [basic.stc.dynamic.deallocation]p1: 5050 // A program is ill-formed if deallocation functions are declared in a 5051 // namespace scope other than global scope or declared static in global 5052 // scope. 5053 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5054 return true; 5055 5056 // C++ [basic.stc.dynamic.deallocation]p2: 5057 // Each deallocation function shall return void and its first parameter 5058 // shall be void*. 5059 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5060 SemaRef.Context.VoidPtrTy, 5061 diag::err_operator_delete_dependent_param_type, 5062 diag::err_operator_delete_param_type)) 5063 return true; 5064 5065 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5066 if (FirstParamType->isDependentType()) 5067 return SemaRef.Diag(FnDecl->getLocation(), 5068 diag::err_operator_delete_dependent_param_type) 5069 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5070 5071 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5072 SemaRef.Context.VoidPtrTy) 5073 return SemaRef.Diag(FnDecl->getLocation(), 5074 diag::err_operator_delete_param_type) 5075 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5076 5077 return false; 5078} 5079 5080/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5081/// of this overloaded operator is well-formed. If so, returns false; 5082/// otherwise, emits appropriate diagnostics and returns true. 5083bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5084 assert(FnDecl && FnDecl->isOverloadedOperator() && 5085 "Expected an overloaded operator declaration"); 5086 5087 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5088 5089 // C++ [over.oper]p5: 5090 // The allocation and deallocation functions, operator new, 5091 // operator new[], operator delete and operator delete[], are 5092 // described completely in 3.7.3. The attributes and restrictions 5093 // found in the rest of this subclause do not apply to them unless 5094 // explicitly stated in 3.7.3. 5095 if (Op == OO_Delete || Op == OO_Array_Delete) 5096 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5097 5098 if (Op == OO_New || Op == OO_Array_New) 5099 return CheckOperatorNewDeclaration(*this, FnDecl); 5100 5101 // C++ [over.oper]p6: 5102 // An operator function shall either be a non-static member 5103 // function or be a non-member function and have at least one 5104 // parameter whose type is a class, a reference to a class, an 5105 // enumeration, or a reference to an enumeration. 5106 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5107 if (MethodDecl->isStatic()) 5108 return Diag(FnDecl->getLocation(), 5109 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5110 } else { 5111 bool ClassOrEnumParam = false; 5112 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5113 ParamEnd = FnDecl->param_end(); 5114 Param != ParamEnd; ++Param) { 5115 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5116 if (ParamType->isDependentType() || ParamType->isRecordType() || 5117 ParamType->isEnumeralType()) { 5118 ClassOrEnumParam = true; 5119 break; 5120 } 5121 } 5122 5123 if (!ClassOrEnumParam) 5124 return Diag(FnDecl->getLocation(), 5125 diag::err_operator_overload_needs_class_or_enum) 5126 << FnDecl->getDeclName(); 5127 } 5128 5129 // C++ [over.oper]p8: 5130 // An operator function cannot have default arguments (8.3.6), 5131 // except where explicitly stated below. 5132 // 5133 // Only the function-call operator allows default arguments 5134 // (C++ [over.call]p1). 5135 if (Op != OO_Call) { 5136 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5137 Param != FnDecl->param_end(); ++Param) { 5138 if ((*Param)->hasDefaultArg()) 5139 return Diag((*Param)->getLocation(), 5140 diag::err_operator_overload_default_arg) 5141 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5142 } 5143 } 5144 5145 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5146 { false, false, false } 5147#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5148 , { Unary, Binary, MemberOnly } 5149#include "clang/Basic/OperatorKinds.def" 5150 }; 5151 5152 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5153 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5154 bool MustBeMemberOperator = OperatorUses[Op][2]; 5155 5156 // C++ [over.oper]p8: 5157 // [...] Operator functions cannot have more or fewer parameters 5158 // than the number required for the corresponding operator, as 5159 // described in the rest of this subclause. 5160 unsigned NumParams = FnDecl->getNumParams() 5161 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5162 if (Op != OO_Call && 5163 ((NumParams == 1 && !CanBeUnaryOperator) || 5164 (NumParams == 2 && !CanBeBinaryOperator) || 5165 (NumParams < 1) || (NumParams > 2))) { 5166 // We have the wrong number of parameters. 5167 unsigned ErrorKind; 5168 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5169 ErrorKind = 2; // 2 -> unary or binary. 5170 } else if (CanBeUnaryOperator) { 5171 ErrorKind = 0; // 0 -> unary 5172 } else { 5173 assert(CanBeBinaryOperator && 5174 "All non-call overloaded operators are unary or binary!"); 5175 ErrorKind = 1; // 1 -> binary 5176 } 5177 5178 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5179 << FnDecl->getDeclName() << NumParams << ErrorKind; 5180 } 5181 5182 // Overloaded operators other than operator() cannot be variadic. 5183 if (Op != OO_Call && 5184 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5185 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5186 << FnDecl->getDeclName(); 5187 } 5188 5189 // Some operators must be non-static member functions. 5190 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5191 return Diag(FnDecl->getLocation(), 5192 diag::err_operator_overload_must_be_member) 5193 << FnDecl->getDeclName(); 5194 } 5195 5196 // C++ [over.inc]p1: 5197 // The user-defined function called operator++ implements the 5198 // prefix and postfix ++ operator. If this function is a member 5199 // function with no parameters, or a non-member function with one 5200 // parameter of class or enumeration type, it defines the prefix 5201 // increment operator ++ for objects of that type. If the function 5202 // is a member function with one parameter (which shall be of type 5203 // int) or a non-member function with two parameters (the second 5204 // of which shall be of type int), it defines the postfix 5205 // increment operator ++ for objects of that type. 5206 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5207 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5208 bool ParamIsInt = false; 5209 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5210 ParamIsInt = BT->getKind() == BuiltinType::Int; 5211 5212 if (!ParamIsInt) 5213 return Diag(LastParam->getLocation(), 5214 diag::err_operator_overload_post_incdec_must_be_int) 5215 << LastParam->getType() << (Op == OO_MinusMinus); 5216 } 5217 5218 // Notify the class if it got an assignment operator. 5219 if (Op == OO_Equal) { 5220 // Would have returned earlier otherwise. 5221 assert(isa<CXXMethodDecl>(FnDecl) && 5222 "Overloaded = not member, but not filtered."); 5223 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5224 Method->getParent()->addedAssignmentOperator(Context, Method); 5225 } 5226 5227 return false; 5228} 5229 5230/// CheckLiteralOperatorDeclaration - Check whether the declaration 5231/// of this literal operator function is well-formed. If so, returns 5232/// false; otherwise, emits appropriate diagnostics and returns true. 5233bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5234 DeclContext *DC = FnDecl->getDeclContext(); 5235 Decl::Kind Kind = DC->getDeclKind(); 5236 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5237 Kind != Decl::LinkageSpec) { 5238 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5239 << FnDecl->getDeclName(); 5240 return true; 5241 } 5242 5243 bool Valid = false; 5244 5245 // template <char...> type operator "" name() is the only valid template 5246 // signature, and the only valid signature with no parameters. 5247 if (FnDecl->param_size() == 0) { 5248 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5249 // Must have only one template parameter 5250 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5251 if (Params->size() == 1) { 5252 NonTypeTemplateParmDecl *PmDecl = 5253 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5254 5255 // The template parameter must be a char parameter pack. 5256 // FIXME: This test will always fail because non-type parameter packs 5257 // have not been implemented. 5258 if (PmDecl && PmDecl->isTemplateParameterPack() && 5259 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5260 Valid = true; 5261 } 5262 } 5263 } else { 5264 // Check the first parameter 5265 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5266 5267 QualType T = (*Param)->getType(); 5268 5269 // unsigned long long int, long double, and any character type are allowed 5270 // as the only parameters. 5271 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5272 Context.hasSameType(T, Context.LongDoubleTy) || 5273 Context.hasSameType(T, Context.CharTy) || 5274 Context.hasSameType(T, Context.WCharTy) || 5275 Context.hasSameType(T, Context.Char16Ty) || 5276 Context.hasSameType(T, Context.Char32Ty)) { 5277 if (++Param == FnDecl->param_end()) 5278 Valid = true; 5279 goto FinishedParams; 5280 } 5281 5282 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5283 const PointerType *PT = T->getAs<PointerType>(); 5284 if (!PT) 5285 goto FinishedParams; 5286 T = PT->getPointeeType(); 5287 if (!T.isConstQualified()) 5288 goto FinishedParams; 5289 T = T.getUnqualifiedType(); 5290 5291 // Move on to the second parameter; 5292 ++Param; 5293 5294 // If there is no second parameter, the first must be a const char * 5295 if (Param == FnDecl->param_end()) { 5296 if (Context.hasSameType(T, Context.CharTy)) 5297 Valid = true; 5298 goto FinishedParams; 5299 } 5300 5301 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5302 // are allowed as the first parameter to a two-parameter function 5303 if (!(Context.hasSameType(T, Context.CharTy) || 5304 Context.hasSameType(T, Context.WCharTy) || 5305 Context.hasSameType(T, Context.Char16Ty) || 5306 Context.hasSameType(T, Context.Char32Ty))) 5307 goto FinishedParams; 5308 5309 // The second and final parameter must be an std::size_t 5310 T = (*Param)->getType().getUnqualifiedType(); 5311 if (Context.hasSameType(T, Context.getSizeType()) && 5312 ++Param == FnDecl->param_end()) 5313 Valid = true; 5314 } 5315 5316 // FIXME: This diagnostic is absolutely terrible. 5317FinishedParams: 5318 if (!Valid) { 5319 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5320 << FnDecl->getDeclName(); 5321 return true; 5322 } 5323 5324 return false; 5325} 5326 5327/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5328/// linkage specification, including the language and (if present) 5329/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5330/// the location of the language string literal, which is provided 5331/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5332/// the '{' brace. Otherwise, this linkage specification does not 5333/// have any braces. 5334Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5335 SourceLocation ExternLoc, 5336 SourceLocation LangLoc, 5337 llvm::StringRef Lang, 5338 SourceLocation LBraceLoc) { 5339 LinkageSpecDecl::LanguageIDs Language; 5340 if (Lang == "\"C\"") 5341 Language = LinkageSpecDecl::lang_c; 5342 else if (Lang == "\"C++\"") 5343 Language = LinkageSpecDecl::lang_cxx; 5344 else { 5345 Diag(LangLoc, diag::err_bad_language); 5346 return DeclPtrTy(); 5347 } 5348 5349 // FIXME: Add all the various semantics of linkage specifications 5350 5351 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5352 LangLoc, Language, 5353 LBraceLoc.isValid()); 5354 CurContext->addDecl(D); 5355 PushDeclContext(S, D); 5356 return DeclPtrTy::make(D); 5357} 5358 5359/// ActOnFinishLinkageSpecification - Completely the definition of 5360/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5361/// valid, it's the position of the closing '}' brace in a linkage 5362/// specification that uses braces. 5363Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5364 DeclPtrTy LinkageSpec, 5365 SourceLocation RBraceLoc) { 5366 if (LinkageSpec) 5367 PopDeclContext(); 5368 return LinkageSpec; 5369} 5370 5371/// \brief Perform semantic analysis for the variable declaration that 5372/// occurs within a C++ catch clause, returning the newly-created 5373/// variable. 5374VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5375 TypeSourceInfo *TInfo, 5376 IdentifierInfo *Name, 5377 SourceLocation Loc, 5378 SourceRange Range) { 5379 bool Invalid = false; 5380 5381 // Arrays and functions decay. 5382 if (ExDeclType->isArrayType()) 5383 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5384 else if (ExDeclType->isFunctionType()) 5385 ExDeclType = Context.getPointerType(ExDeclType); 5386 5387 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5388 // The exception-declaration shall not denote a pointer or reference to an 5389 // incomplete type, other than [cv] void*. 5390 // N2844 forbids rvalue references. 5391 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5392 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5393 Invalid = true; 5394 } 5395 5396 // GCC allows catching pointers and references to incomplete types 5397 // as an extension; so do we, but we warn by default. 5398 5399 QualType BaseType = ExDeclType; 5400 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5401 unsigned DK = diag::err_catch_incomplete; 5402 bool IncompleteCatchIsInvalid = true; 5403 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5404 BaseType = Ptr->getPointeeType(); 5405 Mode = 1; 5406 DK = diag::ext_catch_incomplete_ptr; 5407 IncompleteCatchIsInvalid = false; 5408 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5409 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5410 BaseType = Ref->getPointeeType(); 5411 Mode = 2; 5412 DK = diag::ext_catch_incomplete_ref; 5413 IncompleteCatchIsInvalid = false; 5414 } 5415 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5416 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5417 IncompleteCatchIsInvalid) 5418 Invalid = true; 5419 5420 if (!Invalid && !ExDeclType->isDependentType() && 5421 RequireNonAbstractType(Loc, ExDeclType, 5422 diag::err_abstract_type_in_decl, 5423 AbstractVariableType)) 5424 Invalid = true; 5425 5426 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5427 Name, ExDeclType, TInfo, VarDecl::None, 5428 VarDecl::None); 5429 ExDecl->setExceptionVariable(true); 5430 5431 if (!Invalid) { 5432 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5433 // C++ [except.handle]p16: 5434 // The object declared in an exception-declaration or, if the 5435 // exception-declaration does not specify a name, a temporary (12.2) is 5436 // copy-initialized (8.5) from the exception object. [...] 5437 // The object is destroyed when the handler exits, after the destruction 5438 // of any automatic objects initialized within the handler. 5439 // 5440 // We just pretend to initialize the object with itself, then make sure 5441 // it can be destroyed later. 5442 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5443 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5444 Loc, ExDeclType, 0); 5445 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5446 SourceLocation()); 5447 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5448 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5449 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5450 if (Result.isInvalid()) 5451 Invalid = true; 5452 else 5453 FinalizeVarWithDestructor(ExDecl, RecordTy); 5454 } 5455 } 5456 5457 if (Invalid) 5458 ExDecl->setInvalidDecl(); 5459 5460 return ExDecl; 5461} 5462 5463/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5464/// handler. 5465Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5466 TypeSourceInfo *TInfo = 0; 5467 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5468 5469 bool Invalid = D.isInvalidType(); 5470 IdentifierInfo *II = D.getIdentifier(); 5471 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5472 LookupOrdinaryName, 5473 ForRedeclaration)) { 5474 // The scope should be freshly made just for us. There is just no way 5475 // it contains any previous declaration. 5476 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5477 if (PrevDecl->isTemplateParameter()) { 5478 // Maybe we will complain about the shadowed template parameter. 5479 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5480 } 5481 } 5482 5483 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5484 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5485 << D.getCXXScopeSpec().getRange(); 5486 Invalid = true; 5487 } 5488 5489 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5490 D.getIdentifier(), 5491 D.getIdentifierLoc(), 5492 D.getDeclSpec().getSourceRange()); 5493 5494 if (Invalid) 5495 ExDecl->setInvalidDecl(); 5496 5497 // Add the exception declaration into this scope. 5498 if (II) 5499 PushOnScopeChains(ExDecl, S); 5500 else 5501 CurContext->addDecl(ExDecl); 5502 5503 ProcessDeclAttributes(S, ExDecl, D); 5504 return DeclPtrTy::make(ExDecl); 5505} 5506 5507Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5508 ExprArg assertexpr, 5509 ExprArg assertmessageexpr) { 5510 Expr *AssertExpr = (Expr *)assertexpr.get(); 5511 StringLiteral *AssertMessage = 5512 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5513 5514 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5515 llvm::APSInt Value(32); 5516 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5517 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5518 AssertExpr->getSourceRange(); 5519 return DeclPtrTy(); 5520 } 5521 5522 if (Value == 0) { 5523 Diag(AssertLoc, diag::err_static_assert_failed) 5524 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5525 } 5526 } 5527 5528 assertexpr.release(); 5529 assertmessageexpr.release(); 5530 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5531 AssertExpr, AssertMessage); 5532 5533 CurContext->addDecl(Decl); 5534 return DeclPtrTy::make(Decl); 5535} 5536 5537/// \brief Perform semantic analysis of the given friend type declaration. 5538/// 5539/// \returns A friend declaration that. 5540FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5541 TypeSourceInfo *TSInfo) { 5542 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5543 5544 QualType T = TSInfo->getType(); 5545 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5546 5547 if (!getLangOptions().CPlusPlus0x) { 5548 // C++03 [class.friend]p2: 5549 // An elaborated-type-specifier shall be used in a friend declaration 5550 // for a class.* 5551 // 5552 // * The class-key of the elaborated-type-specifier is required. 5553 if (!ActiveTemplateInstantiations.empty()) { 5554 // Do not complain about the form of friend template types during 5555 // template instantiation; we will already have complained when the 5556 // template was declared. 5557 } else if (!T->isElaboratedTypeSpecifier()) { 5558 // If we evaluated the type to a record type, suggest putting 5559 // a tag in front. 5560 if (const RecordType *RT = T->getAs<RecordType>()) { 5561 RecordDecl *RD = RT->getDecl(); 5562 5563 std::string InsertionText = std::string(" ") + RD->getKindName(); 5564 5565 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5566 << (unsigned) RD->getTagKind() 5567 << T 5568 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5569 InsertionText); 5570 } else { 5571 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5572 << T 5573 << SourceRange(FriendLoc, TypeRange.getEnd()); 5574 } 5575 } else if (T->getAs<EnumType>()) { 5576 Diag(FriendLoc, diag::ext_enum_friend) 5577 << T 5578 << SourceRange(FriendLoc, TypeRange.getEnd()); 5579 } 5580 } 5581 5582 // C++0x [class.friend]p3: 5583 // If the type specifier in a friend declaration designates a (possibly 5584 // cv-qualified) class type, that class is declared as a friend; otherwise, 5585 // the friend declaration is ignored. 5586 5587 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5588 // in [class.friend]p3 that we do not implement. 5589 5590 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5591} 5592 5593/// Handle a friend type declaration. This works in tandem with 5594/// ActOnTag. 5595/// 5596/// Notes on friend class templates: 5597/// 5598/// We generally treat friend class declarations as if they were 5599/// declaring a class. So, for example, the elaborated type specifier 5600/// in a friend declaration is required to obey the restrictions of a 5601/// class-head (i.e. no typedefs in the scope chain), template 5602/// parameters are required to match up with simple template-ids, &c. 5603/// However, unlike when declaring a template specialization, it's 5604/// okay to refer to a template specialization without an empty 5605/// template parameter declaration, e.g. 5606/// friend class A<T>::B<unsigned>; 5607/// We permit this as a special case; if there are any template 5608/// parameters present at all, require proper matching, i.e. 5609/// template <> template <class T> friend class A<int>::B; 5610Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5611 MultiTemplateParamsArg TempParams) { 5612 SourceLocation Loc = DS.getSourceRange().getBegin(); 5613 5614 assert(DS.isFriendSpecified()); 5615 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5616 5617 // Try to convert the decl specifier to a type. This works for 5618 // friend templates because ActOnTag never produces a ClassTemplateDecl 5619 // for a TUK_Friend. 5620 Declarator TheDeclarator(DS, Declarator::MemberContext); 5621 TypeSourceInfo *TSI; 5622 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5623 if (TheDeclarator.isInvalidType()) 5624 return DeclPtrTy(); 5625 5626 if (!TSI) 5627 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5628 5629 // This is definitely an error in C++98. It's probably meant to 5630 // be forbidden in C++0x, too, but the specification is just 5631 // poorly written. 5632 // 5633 // The problem is with declarations like the following: 5634 // template <T> friend A<T>::foo; 5635 // where deciding whether a class C is a friend or not now hinges 5636 // on whether there exists an instantiation of A that causes 5637 // 'foo' to equal C. There are restrictions on class-heads 5638 // (which we declare (by fiat) elaborated friend declarations to 5639 // be) that makes this tractable. 5640 // 5641 // FIXME: handle "template <> friend class A<T>;", which 5642 // is possibly well-formed? Who even knows? 5643 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5644 Diag(Loc, diag::err_tagless_friend_type_template) 5645 << DS.getSourceRange(); 5646 return DeclPtrTy(); 5647 } 5648 5649 // C++98 [class.friend]p1: A friend of a class is a function 5650 // or class that is not a member of the class . . . 5651 // This is fixed in DR77, which just barely didn't make the C++03 5652 // deadline. It's also a very silly restriction that seriously 5653 // affects inner classes and which nobody else seems to implement; 5654 // thus we never diagnose it, not even in -pedantic. 5655 // 5656 // But note that we could warn about it: it's always useless to 5657 // friend one of your own members (it's not, however, worthless to 5658 // friend a member of an arbitrary specialization of your template). 5659 5660 Decl *D; 5661 if (unsigned NumTempParamLists = TempParams.size()) 5662 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5663 NumTempParamLists, 5664 (TemplateParameterList**) TempParams.release(), 5665 TSI, 5666 DS.getFriendSpecLoc()); 5667 else 5668 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5669 5670 if (!D) 5671 return DeclPtrTy(); 5672 5673 D->setAccess(AS_public); 5674 CurContext->addDecl(D); 5675 5676 return DeclPtrTy::make(D); 5677} 5678 5679Sema::DeclPtrTy 5680Sema::ActOnFriendFunctionDecl(Scope *S, 5681 Declarator &D, 5682 bool IsDefinition, 5683 MultiTemplateParamsArg TemplateParams) { 5684 const DeclSpec &DS = D.getDeclSpec(); 5685 5686 assert(DS.isFriendSpecified()); 5687 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5688 5689 SourceLocation Loc = D.getIdentifierLoc(); 5690 TypeSourceInfo *TInfo = 0; 5691 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5692 5693 // C++ [class.friend]p1 5694 // A friend of a class is a function or class.... 5695 // Note that this sees through typedefs, which is intended. 5696 // It *doesn't* see through dependent types, which is correct 5697 // according to [temp.arg.type]p3: 5698 // If a declaration acquires a function type through a 5699 // type dependent on a template-parameter and this causes 5700 // a declaration that does not use the syntactic form of a 5701 // function declarator to have a function type, the program 5702 // is ill-formed. 5703 if (!T->isFunctionType()) { 5704 Diag(Loc, diag::err_unexpected_friend); 5705 5706 // It might be worthwhile to try to recover by creating an 5707 // appropriate declaration. 5708 return DeclPtrTy(); 5709 } 5710 5711 // C++ [namespace.memdef]p3 5712 // - If a friend declaration in a non-local class first declares a 5713 // class or function, the friend class or function is a member 5714 // of the innermost enclosing namespace. 5715 // - The name of the friend is not found by simple name lookup 5716 // until a matching declaration is provided in that namespace 5717 // scope (either before or after the class declaration granting 5718 // friendship). 5719 // - If a friend function is called, its name may be found by the 5720 // name lookup that considers functions from namespaces and 5721 // classes associated with the types of the function arguments. 5722 // - When looking for a prior declaration of a class or a function 5723 // declared as a friend, scopes outside the innermost enclosing 5724 // namespace scope are not considered. 5725 5726 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5727 DeclarationName Name = GetNameForDeclarator(D); 5728 assert(Name); 5729 5730 // The context we found the declaration in, or in which we should 5731 // create the declaration. 5732 DeclContext *DC; 5733 5734 // FIXME: handle local classes 5735 5736 // Recover from invalid scope qualifiers as if they just weren't there. 5737 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5738 ForRedeclaration); 5739 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5740 DC = computeDeclContext(ScopeQual); 5741 5742 // FIXME: handle dependent contexts 5743 if (!DC) return DeclPtrTy(); 5744 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5745 5746 LookupQualifiedName(Previous, DC); 5747 5748 // If searching in that context implicitly found a declaration in 5749 // a different context, treat it like it wasn't found at all. 5750 // TODO: better diagnostics for this case. Suggesting the right 5751 // qualified scope would be nice... 5752 // FIXME: getRepresentativeDecl() is not right here at all 5753 if (Previous.empty() || 5754 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5755 D.setInvalidType(); 5756 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5757 return DeclPtrTy(); 5758 } 5759 5760 // C++ [class.friend]p1: A friend of a class is a function or 5761 // class that is not a member of the class . . . 5762 if (DC->Equals(CurContext)) 5763 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5764 5765 // Otherwise walk out to the nearest namespace scope looking for matches. 5766 } else { 5767 // TODO: handle local class contexts. 5768 5769 DC = CurContext; 5770 while (true) { 5771 // Skip class contexts. If someone can cite chapter and verse 5772 // for this behavior, that would be nice --- it's what GCC and 5773 // EDG do, and it seems like a reasonable intent, but the spec 5774 // really only says that checks for unqualified existing 5775 // declarations should stop at the nearest enclosing namespace, 5776 // not that they should only consider the nearest enclosing 5777 // namespace. 5778 while (DC->isRecord()) 5779 DC = DC->getParent(); 5780 5781 LookupQualifiedName(Previous, DC); 5782 5783 // TODO: decide what we think about using declarations. 5784 if (!Previous.empty()) 5785 break; 5786 5787 if (DC->isFileContext()) break; 5788 DC = DC->getParent(); 5789 } 5790 5791 // C++ [class.friend]p1: A friend of a class is a function or 5792 // class that is not a member of the class . . . 5793 // C++0x changes this for both friend types and functions. 5794 // Most C++ 98 compilers do seem to give an error here, so 5795 // we do, too. 5796 if (!Previous.empty() && DC->Equals(CurContext) 5797 && !getLangOptions().CPlusPlus0x) 5798 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5799 } 5800 5801 if (DC->isFileContext()) { 5802 // This implies that it has to be an operator or function. 5803 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5804 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5805 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5806 Diag(Loc, diag::err_introducing_special_friend) << 5807 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5808 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5809 return DeclPtrTy(); 5810 } 5811 } 5812 5813 bool Redeclaration = false; 5814 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5815 move(TemplateParams), 5816 IsDefinition, 5817 Redeclaration); 5818 if (!ND) return DeclPtrTy(); 5819 5820 assert(ND->getDeclContext() == DC); 5821 assert(ND->getLexicalDeclContext() == CurContext); 5822 5823 // Add the function declaration to the appropriate lookup tables, 5824 // adjusting the redeclarations list as necessary. We don't 5825 // want to do this yet if the friending class is dependent. 5826 // 5827 // Also update the scope-based lookup if the target context's 5828 // lookup context is in lexical scope. 5829 if (!CurContext->isDependentContext()) { 5830 DC = DC->getLookupContext(); 5831 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5832 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5833 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5834 } 5835 5836 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5837 D.getIdentifierLoc(), ND, 5838 DS.getFriendSpecLoc()); 5839 FrD->setAccess(AS_public); 5840 CurContext->addDecl(FrD); 5841 5842 return DeclPtrTy::make(ND); 5843} 5844 5845void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5846 AdjustDeclIfTemplate(dcl); 5847 5848 Decl *Dcl = dcl.getAs<Decl>(); 5849 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5850 if (!Fn) { 5851 Diag(DelLoc, diag::err_deleted_non_function); 5852 return; 5853 } 5854 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5855 Diag(DelLoc, diag::err_deleted_decl_not_first); 5856 Diag(Prev->getLocation(), diag::note_previous_declaration); 5857 // If the declaration wasn't the first, we delete the function anyway for 5858 // recovery. 5859 } 5860 Fn->setDeleted(); 5861} 5862 5863static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5864 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5865 ++CI) { 5866 Stmt *SubStmt = *CI; 5867 if (!SubStmt) 5868 continue; 5869 if (isa<ReturnStmt>(SubStmt)) 5870 Self.Diag(SubStmt->getSourceRange().getBegin(), 5871 diag::err_return_in_constructor_handler); 5872 if (!isa<Expr>(SubStmt)) 5873 SearchForReturnInStmt(Self, SubStmt); 5874 } 5875} 5876 5877void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5878 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5879 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5880 SearchForReturnInStmt(*this, Handler); 5881 } 5882} 5883 5884bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5885 const CXXMethodDecl *Old) { 5886 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5887 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5888 5889 if (Context.hasSameType(NewTy, OldTy) || 5890 NewTy->isDependentType() || OldTy->isDependentType()) 5891 return false; 5892 5893 // Check if the return types are covariant 5894 QualType NewClassTy, OldClassTy; 5895 5896 /// Both types must be pointers or references to classes. 5897 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5898 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5899 NewClassTy = NewPT->getPointeeType(); 5900 OldClassTy = OldPT->getPointeeType(); 5901 } 5902 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5903 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5904 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5905 NewClassTy = NewRT->getPointeeType(); 5906 OldClassTy = OldRT->getPointeeType(); 5907 } 5908 } 5909 } 5910 5911 // The return types aren't either both pointers or references to a class type. 5912 if (NewClassTy.isNull()) { 5913 Diag(New->getLocation(), 5914 diag::err_different_return_type_for_overriding_virtual_function) 5915 << New->getDeclName() << NewTy << OldTy; 5916 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5917 5918 return true; 5919 } 5920 5921 // C++ [class.virtual]p6: 5922 // If the return type of D::f differs from the return type of B::f, the 5923 // class type in the return type of D::f shall be complete at the point of 5924 // declaration of D::f or shall be the class type D. 5925 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5926 if (!RT->isBeingDefined() && 5927 RequireCompleteType(New->getLocation(), NewClassTy, 5928 PDiag(diag::err_covariant_return_incomplete) 5929 << New->getDeclName())) 5930 return true; 5931 } 5932 5933 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5934 // Check if the new class derives from the old class. 5935 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5936 Diag(New->getLocation(), 5937 diag::err_covariant_return_not_derived) 5938 << New->getDeclName() << NewTy << OldTy; 5939 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5940 return true; 5941 } 5942 5943 // Check if we the conversion from derived to base is valid. 5944 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5945 diag::err_covariant_return_inaccessible_base, 5946 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5947 // FIXME: Should this point to the return type? 5948 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5949 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5950 return true; 5951 } 5952 } 5953 5954 // The qualifiers of the return types must be the same. 5955 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5956 Diag(New->getLocation(), 5957 diag::err_covariant_return_type_different_qualifications) 5958 << New->getDeclName() << NewTy << OldTy; 5959 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5960 return true; 5961 }; 5962 5963 5964 // The new class type must have the same or less qualifiers as the old type. 5965 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5966 Diag(New->getLocation(), 5967 diag::err_covariant_return_type_class_type_more_qualified) 5968 << New->getDeclName() << NewTy << OldTy; 5969 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5970 return true; 5971 }; 5972 5973 return false; 5974} 5975 5976bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5977 const CXXMethodDecl *Old) 5978{ 5979 if (Old->hasAttr<FinalAttr>()) { 5980 Diag(New->getLocation(), diag::err_final_function_overridden) 5981 << New->getDeclName(); 5982 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5983 return true; 5984 } 5985 5986 return false; 5987} 5988 5989/// \brief Mark the given method pure. 5990/// 5991/// \param Method the method to be marked pure. 5992/// 5993/// \param InitRange the source range that covers the "0" initializer. 5994bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5995 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5996 Method->setPure(); 5997 5998 // A class is abstract if at least one function is pure virtual. 5999 Method->getParent()->setAbstract(true); 6000 return false; 6001 } 6002 6003 if (!Method->isInvalidDecl()) 6004 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6005 << Method->getDeclName() << InitRange; 6006 return true; 6007} 6008 6009/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6010/// an initializer for the out-of-line declaration 'Dcl'. The scope 6011/// is a fresh scope pushed for just this purpose. 6012/// 6013/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6014/// static data member of class X, names should be looked up in the scope of 6015/// class X. 6016void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6017 // If there is no declaration, there was an error parsing it. 6018 Decl *D = Dcl.getAs<Decl>(); 6019 if (D == 0) return; 6020 6021 // We should only get called for declarations with scope specifiers, like: 6022 // int foo::bar; 6023 assert(D->isOutOfLine()); 6024 EnterDeclaratorContext(S, D->getDeclContext()); 6025} 6026 6027/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6028/// initializer for the out-of-line declaration 'Dcl'. 6029void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6030 // If there is no declaration, there was an error parsing it. 6031 Decl *D = Dcl.getAs<Decl>(); 6032 if (D == 0) return; 6033 6034 assert(D->isOutOfLine()); 6035 ExitDeclaratorContext(S); 6036} 6037 6038/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6039/// C++ if/switch/while/for statement. 6040/// e.g: "if (int x = f()) {...}" 6041Action::DeclResult 6042Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6043 // C++ 6.4p2: 6044 // The declarator shall not specify a function or an array. 6045 // The type-specifier-seq shall not contain typedef and shall not declare a 6046 // new class or enumeration. 6047 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6048 "Parser allowed 'typedef' as storage class of condition decl."); 6049 6050 TypeSourceInfo *TInfo = 0; 6051 TagDecl *OwnedTag = 0; 6052 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 6053 6054 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6055 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6056 // would be created and CXXConditionDeclExpr wants a VarDecl. 6057 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6058 << D.getSourceRange(); 6059 return DeclResult(); 6060 } else if (OwnedTag && OwnedTag->isDefinition()) { 6061 // The type-specifier-seq shall not declare a new class or enumeration. 6062 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6063 } 6064 6065 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6066 if (!Dcl) 6067 return DeclResult(); 6068 6069 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6070 VD->setDeclaredInCondition(true); 6071 return Dcl; 6072} 6073 6074void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6075 bool DefinitionRequired) { 6076 // Ignore any vtable uses in unevaluated operands or for classes that do 6077 // not have a vtable. 6078 if (!Class->isDynamicClass() || Class->isDependentContext() || 6079 CurContext->isDependentContext() || 6080 ExprEvalContexts.back().Context == Unevaluated) 6081 return; 6082 6083 // Try to insert this class into the map. 6084 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6085 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6086 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6087 if (!Pos.second) { 6088 // If we already had an entry, check to see if we are promoting this vtable 6089 // to required a definition. If so, we need to reappend to the VTableUses 6090 // list, since we may have already processed the first entry. 6091 if (DefinitionRequired && !Pos.first->second) { 6092 Pos.first->second = true; 6093 } else { 6094 // Otherwise, we can early exit. 6095 return; 6096 } 6097 } 6098 6099 // Local classes need to have their virtual members marked 6100 // immediately. For all other classes, we mark their virtual members 6101 // at the end of the translation unit. 6102 if (Class->isLocalClass()) 6103 MarkVirtualMembersReferenced(Loc, Class); 6104 else 6105 VTableUses.push_back(std::make_pair(Class, Loc)); 6106} 6107 6108bool Sema::DefineUsedVTables() { 6109 // If any dynamic classes have their key function defined within 6110 // this translation unit, then those vtables are considered "used" and must 6111 // be emitted. 6112 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6113 if (const CXXMethodDecl *KeyFunction 6114 = Context.getKeyFunction(DynamicClasses[I])) { 6115 const FunctionDecl *Definition = 0; 6116 if (KeyFunction->getBody(Definition)) 6117 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6118 } 6119 } 6120 6121 if (VTableUses.empty()) 6122 return false; 6123 6124 // Note: The VTableUses vector could grow as a result of marking 6125 // the members of a class as "used", so we check the size each 6126 // time through the loop and prefer indices (with are stable) to 6127 // iterators (which are not). 6128 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6129 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6130 if (!Class) 6131 continue; 6132 6133 SourceLocation Loc = VTableUses[I].second; 6134 6135 // If this class has a key function, but that key function is 6136 // defined in another translation unit, we don't need to emit the 6137 // vtable even though we're using it. 6138 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6139 if (KeyFunction && !KeyFunction->getBody()) { 6140 switch (KeyFunction->getTemplateSpecializationKind()) { 6141 case TSK_Undeclared: 6142 case TSK_ExplicitSpecialization: 6143 case TSK_ExplicitInstantiationDeclaration: 6144 // The key function is in another translation unit. 6145 continue; 6146 6147 case TSK_ExplicitInstantiationDefinition: 6148 case TSK_ImplicitInstantiation: 6149 // We will be instantiating the key function. 6150 break; 6151 } 6152 } else if (!KeyFunction) { 6153 // If we have a class with no key function that is the subject 6154 // of an explicit instantiation declaration, suppress the 6155 // vtable; it will live with the explicit instantiation 6156 // definition. 6157 bool IsExplicitInstantiationDeclaration 6158 = Class->getTemplateSpecializationKind() 6159 == TSK_ExplicitInstantiationDeclaration; 6160 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6161 REnd = Class->redecls_end(); 6162 R != REnd; ++R) { 6163 TemplateSpecializationKind TSK 6164 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6165 if (TSK == TSK_ExplicitInstantiationDeclaration) 6166 IsExplicitInstantiationDeclaration = true; 6167 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6168 IsExplicitInstantiationDeclaration = false; 6169 break; 6170 } 6171 } 6172 6173 if (IsExplicitInstantiationDeclaration) 6174 continue; 6175 } 6176 6177 // Mark all of the virtual members of this class as referenced, so 6178 // that we can build a vtable. Then, tell the AST consumer that a 6179 // vtable for this class is required. 6180 MarkVirtualMembersReferenced(Loc, Class); 6181 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6182 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6183 6184 // Optionally warn if we're emitting a weak vtable. 6185 if (Class->getLinkage() == ExternalLinkage && 6186 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6187 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6188 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6189 } 6190 } 6191 VTableUses.clear(); 6192 6193 return true; 6194} 6195 6196void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6197 const CXXRecordDecl *RD) { 6198 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6199 e = RD->method_end(); i != e; ++i) { 6200 CXXMethodDecl *MD = *i; 6201 6202 // C++ [basic.def.odr]p2: 6203 // [...] A virtual member function is used if it is not pure. [...] 6204 if (MD->isVirtual() && !MD->isPure()) 6205 MarkDeclarationReferenced(Loc, MD); 6206 } 6207 6208 // Only classes that have virtual bases need a VTT. 6209 if (RD->getNumVBases() == 0) 6210 return; 6211 6212 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6213 e = RD->bases_end(); i != e; ++i) { 6214 const CXXRecordDecl *Base = 6215 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6216 if (i->isVirtual()) 6217 continue; 6218 if (Base->getNumVBases() == 0) 6219 continue; 6220 MarkVirtualMembersReferenced(Loc, Base); 6221 } 6222} 6223 6224/// SetIvarInitializers - This routine builds initialization ASTs for the 6225/// Objective-C implementation whose ivars need be initialized. 6226void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6227 if (!getLangOptions().CPlusPlus) 6228 return; 6229 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6230 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6231 CollectIvarsToConstructOrDestruct(OID, ivars); 6232 if (ivars.empty()) 6233 return; 6234 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6235 for (unsigned i = 0; i < ivars.size(); i++) { 6236 FieldDecl *Field = ivars[i]; 6237 if (Field->isInvalidDecl()) 6238 continue; 6239 6240 CXXBaseOrMemberInitializer *Member; 6241 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6242 InitializationKind InitKind = 6243 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6244 6245 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6246 Sema::OwningExprResult MemberInit = 6247 InitSeq.Perform(*this, InitEntity, InitKind, 6248 Sema::MultiExprArg(*this, 0, 0)); 6249 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6250 // Note, MemberInit could actually come back empty if no initialization 6251 // is required (e.g., because it would call a trivial default constructor) 6252 if (!MemberInit.get() || MemberInit.isInvalid()) 6253 continue; 6254 6255 Member = 6256 new (Context) CXXBaseOrMemberInitializer(Context, 6257 Field, SourceLocation(), 6258 SourceLocation(), 6259 MemberInit.takeAs<Expr>(), 6260 SourceLocation()); 6261 AllToInit.push_back(Member); 6262 6263 // Be sure that the destructor is accessible and is marked as referenced. 6264 if (const RecordType *RecordTy 6265 = Context.getBaseElementType(Field->getType()) 6266 ->getAs<RecordType>()) { 6267 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6268 if (CXXDestructorDecl *Destructor 6269 = const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) { 6270 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6271 CheckDestructorAccess(Field->getLocation(), Destructor, 6272 PDiag(diag::err_access_dtor_ivar) 6273 << Context.getBaseElementType(Field->getType())); 6274 } 6275 } 6276 } 6277 ObjCImplementation->setIvarInitializers(Context, 6278 AllToInit.data(), AllToInit.size()); 6279 } 6280} 6281