SemaDeclCXX.cpp revision f1860e5c381a2710fcebe6d55d799c6b25c21041
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 626 if (KnownBaseTypes[NewBaseType]) { 627 // C++ [class.mi]p3: 628 // A class shall not be specified as a direct base class of a 629 // derived class more than once. 630 Diag(Bases[idx]->getSourceRange().getBegin(), 631 diag::err_duplicate_base_class) 632 << KnownBaseTypes[NewBaseType]->getType() 633 << Bases[idx]->getSourceRange(); 634 635 // Delete the duplicate base class specifier; we're going to 636 // overwrite its pointer later. 637 Context.Deallocate(Bases[idx]); 638 639 Invalid = true; 640 } else { 641 // Okay, add this new base class. 642 KnownBaseTypes[NewBaseType] = Bases[idx]; 643 Bases[NumGoodBases++] = Bases[idx]; 644 } 645 } 646 647 // Attach the remaining base class specifiers to the derived class. 648 Class->setBases(Bases, NumGoodBases); 649 650 // Delete the remaining (good) base class specifiers, since their 651 // data has been copied into the CXXRecordDecl. 652 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 653 Context.Deallocate(Bases[idx]); 654 655 return Invalid; 656} 657 658/// ActOnBaseSpecifiers - Attach the given base specifiers to the 659/// class, after checking whether there are any duplicate base 660/// classes. 661void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 662 unsigned NumBases) { 663 if (!ClassDecl || !Bases || !NumBases) 664 return; 665 666 AdjustDeclIfTemplate(ClassDecl); 667 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 668 (CXXBaseSpecifier**)(Bases), NumBases); 669} 670 671static CXXRecordDecl *GetClassForType(QualType T) { 672 if (const RecordType *RT = T->getAs<RecordType>()) 673 return cast<CXXRecordDecl>(RT->getDecl()); 674 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 675 return ICT->getDecl(); 676 else 677 return 0; 678} 679 680/// \brief Determine whether the type \p Derived is a C++ class that is 681/// derived from the type \p Base. 682bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 683 if (!getLangOptions().CPlusPlus) 684 return false; 685 686 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 687 if (!DerivedRD) 688 return false; 689 690 CXXRecordDecl *BaseRD = GetClassForType(Base); 691 if (!BaseRD) 692 return false; 693 694 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 695 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 696} 697 698/// \brief Determine whether the type \p Derived is a C++ class that is 699/// derived from the type \p Base. 700bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 701 if (!getLangOptions().CPlusPlus) 702 return false; 703 704 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 705 if (!DerivedRD) 706 return false; 707 708 CXXRecordDecl *BaseRD = GetClassForType(Base); 709 if (!BaseRD) 710 return false; 711 712 return DerivedRD->isDerivedFrom(BaseRD, Paths); 713} 714 715void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 716 CXXBaseSpecifierArray &BasePathArray) { 717 assert(BasePathArray.empty() && "Base path array must be empty!"); 718 assert(Paths.isRecordingPaths() && "Must record paths!"); 719 720 const CXXBasePath &Path = Paths.front(); 721 722 // We first go backward and check if we have a virtual base. 723 // FIXME: It would be better if CXXBasePath had the base specifier for 724 // the nearest virtual base. 725 unsigned Start = 0; 726 for (unsigned I = Path.size(); I != 0; --I) { 727 if (Path[I - 1].Base->isVirtual()) { 728 Start = I - 1; 729 break; 730 } 731 } 732 733 // Now add all bases. 734 for (unsigned I = Start, E = Path.size(); I != E; ++I) 735 BasePathArray.push_back(Path[I].Base); 736} 737 738/// \brief Determine whether the given base path includes a virtual 739/// base class. 740bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 741 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 742 BEnd = BasePath.end(); 743 B != BEnd; ++B) 744 if ((*B)->isVirtual()) 745 return true; 746 747 return false; 748} 749 750/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 751/// conversion (where Derived and Base are class types) is 752/// well-formed, meaning that the conversion is unambiguous (and 753/// that all of the base classes are accessible). Returns true 754/// and emits a diagnostic if the code is ill-formed, returns false 755/// otherwise. Loc is the location where this routine should point to 756/// if there is an error, and Range is the source range to highlight 757/// if there is an error. 758bool 759Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 760 unsigned InaccessibleBaseID, 761 unsigned AmbigiousBaseConvID, 762 SourceLocation Loc, SourceRange Range, 763 DeclarationName Name, 764 CXXBaseSpecifierArray *BasePath) { 765 // First, determine whether the path from Derived to Base is 766 // ambiguous. This is slightly more expensive than checking whether 767 // the Derived to Base conversion exists, because here we need to 768 // explore multiple paths to determine if there is an ambiguity. 769 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 770 /*DetectVirtual=*/false); 771 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 772 assert(DerivationOkay && 773 "Can only be used with a derived-to-base conversion"); 774 (void)DerivationOkay; 775 776 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 777 if (InaccessibleBaseID) { 778 // Check that the base class can be accessed. 779 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 780 InaccessibleBaseID)) { 781 case AR_inaccessible: 782 return true; 783 case AR_accessible: 784 case AR_dependent: 785 case AR_delayed: 786 break; 787 } 788 } 789 790 // Build a base path if necessary. 791 if (BasePath) 792 BuildBasePathArray(Paths, *BasePath); 793 return false; 794 } 795 796 // We know that the derived-to-base conversion is ambiguous, and 797 // we're going to produce a diagnostic. Perform the derived-to-base 798 // search just one more time to compute all of the possible paths so 799 // that we can print them out. This is more expensive than any of 800 // the previous derived-to-base checks we've done, but at this point 801 // performance isn't as much of an issue. 802 Paths.clear(); 803 Paths.setRecordingPaths(true); 804 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 805 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 806 (void)StillOkay; 807 808 // Build up a textual representation of the ambiguous paths, e.g., 809 // D -> B -> A, that will be used to illustrate the ambiguous 810 // conversions in the diagnostic. We only print one of the paths 811 // to each base class subobject. 812 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 813 814 Diag(Loc, AmbigiousBaseConvID) 815 << Derived << Base << PathDisplayStr << Range << Name; 816 return true; 817} 818 819bool 820Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 821 SourceLocation Loc, SourceRange Range, 822 CXXBaseSpecifierArray *BasePath, 823 bool IgnoreAccess) { 824 return CheckDerivedToBaseConversion(Derived, Base, 825 IgnoreAccess ? 0 826 : diag::err_upcast_to_inaccessible_base, 827 diag::err_ambiguous_derived_to_base_conv, 828 Loc, Range, DeclarationName(), 829 BasePath); 830} 831 832 833/// @brief Builds a string representing ambiguous paths from a 834/// specific derived class to different subobjects of the same base 835/// class. 836/// 837/// This function builds a string that can be used in error messages 838/// to show the different paths that one can take through the 839/// inheritance hierarchy to go from the derived class to different 840/// subobjects of a base class. The result looks something like this: 841/// @code 842/// struct D -> struct B -> struct A 843/// struct D -> struct C -> struct A 844/// @endcode 845std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 846 std::string PathDisplayStr; 847 std::set<unsigned> DisplayedPaths; 848 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 849 Path != Paths.end(); ++Path) { 850 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 851 // We haven't displayed a path to this particular base 852 // class subobject yet. 853 PathDisplayStr += "\n "; 854 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 855 for (CXXBasePath::const_iterator Element = Path->begin(); 856 Element != Path->end(); ++Element) 857 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 858 } 859 } 860 861 return PathDisplayStr; 862} 863 864//===----------------------------------------------------------------------===// 865// C++ class member Handling 866//===----------------------------------------------------------------------===// 867 868/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 869/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 870/// bitfield width if there is one and 'InitExpr' specifies the initializer if 871/// any. 872Sema::DeclPtrTy 873Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 874 MultiTemplateParamsArg TemplateParameterLists, 875 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 876 bool Deleted) { 877 const DeclSpec &DS = D.getDeclSpec(); 878 DeclarationName Name = GetNameForDeclarator(D); 879 Expr *BitWidth = static_cast<Expr*>(BW); 880 Expr *Init = static_cast<Expr*>(InitExpr); 881 SourceLocation Loc = D.getIdentifierLoc(); 882 883 bool isFunc = D.isFunctionDeclarator(); 884 885 assert(!DS.isFriendSpecified()); 886 887 // C++ 9.2p6: A member shall not be declared to have automatic storage 888 // duration (auto, register) or with the extern storage-class-specifier. 889 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 890 // data members and cannot be applied to names declared const or static, 891 // and cannot be applied to reference members. 892 switch (DS.getStorageClassSpec()) { 893 case DeclSpec::SCS_unspecified: 894 case DeclSpec::SCS_typedef: 895 case DeclSpec::SCS_static: 896 // FALL THROUGH. 897 break; 898 case DeclSpec::SCS_mutable: 899 if (isFunc) { 900 if (DS.getStorageClassSpecLoc().isValid()) 901 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 902 else 903 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 904 905 // FIXME: It would be nicer if the keyword was ignored only for this 906 // declarator. Otherwise we could get follow-up errors. 907 D.getMutableDeclSpec().ClearStorageClassSpecs(); 908 } else { 909 QualType T = GetTypeForDeclarator(D, S); 910 diag::kind err = static_cast<diag::kind>(0); 911 if (T->isReferenceType()) 912 err = diag::err_mutable_reference; 913 else if (T.isConstQualified()) 914 err = diag::err_mutable_const; 915 if (err != 0) { 916 if (DS.getStorageClassSpecLoc().isValid()) 917 Diag(DS.getStorageClassSpecLoc(), err); 918 else 919 Diag(DS.getThreadSpecLoc(), err); 920 // FIXME: It would be nicer if the keyword was ignored only for this 921 // declarator. Otherwise we could get follow-up errors. 922 D.getMutableDeclSpec().ClearStorageClassSpecs(); 923 } 924 } 925 break; 926 default: 927 if (DS.getStorageClassSpecLoc().isValid()) 928 Diag(DS.getStorageClassSpecLoc(), 929 diag::err_storageclass_invalid_for_member); 930 else 931 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 932 D.getMutableDeclSpec().ClearStorageClassSpecs(); 933 } 934 935 if (!isFunc && 936 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 937 D.getNumTypeObjects() == 0) { 938 // Check also for this case: 939 // 940 // typedef int f(); 941 // f a; 942 // 943 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 944 isFunc = TDType->isFunctionType(); 945 } 946 947 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 948 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 949 !isFunc); 950 951 Decl *Member; 952 if (isInstField) { 953 // FIXME: Check for template parameters! 954 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 955 AS); 956 assert(Member && "HandleField never returns null"); 957 } else { 958 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 959 .getAs<Decl>(); 960 if (!Member) { 961 if (BitWidth) DeleteExpr(BitWidth); 962 return DeclPtrTy(); 963 } 964 965 // Non-instance-fields can't have a bitfield. 966 if (BitWidth) { 967 if (Member->isInvalidDecl()) { 968 // don't emit another diagnostic. 969 } else if (isa<VarDecl>(Member)) { 970 // C++ 9.6p3: A bit-field shall not be a static member. 971 // "static member 'A' cannot be a bit-field" 972 Diag(Loc, diag::err_static_not_bitfield) 973 << Name << BitWidth->getSourceRange(); 974 } else if (isa<TypedefDecl>(Member)) { 975 // "typedef member 'x' cannot be a bit-field" 976 Diag(Loc, diag::err_typedef_not_bitfield) 977 << Name << BitWidth->getSourceRange(); 978 } else { 979 // A function typedef ("typedef int f(); f a;"). 980 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 981 Diag(Loc, diag::err_not_integral_type_bitfield) 982 << Name << cast<ValueDecl>(Member)->getType() 983 << BitWidth->getSourceRange(); 984 } 985 986 DeleteExpr(BitWidth); 987 BitWidth = 0; 988 Member->setInvalidDecl(); 989 } 990 991 Member->setAccess(AS); 992 993 // If we have declared a member function template, set the access of the 994 // templated declaration as well. 995 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 996 FunTmpl->getTemplatedDecl()->setAccess(AS); 997 } 998 999 assert((Name || isInstField) && "No identifier for non-field ?"); 1000 1001 if (Init) 1002 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1003 if (Deleted) // FIXME: Source location is not very good. 1004 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1005 1006 if (isInstField) { 1007 FieldCollector->Add(cast<FieldDecl>(Member)); 1008 return DeclPtrTy(); 1009 } 1010 return DeclPtrTy::make(Member); 1011} 1012 1013/// \brief Find the direct and/or virtual base specifiers that 1014/// correspond to the given base type, for use in base initialization 1015/// within a constructor. 1016static bool FindBaseInitializer(Sema &SemaRef, 1017 CXXRecordDecl *ClassDecl, 1018 QualType BaseType, 1019 const CXXBaseSpecifier *&DirectBaseSpec, 1020 const CXXBaseSpecifier *&VirtualBaseSpec) { 1021 // First, check for a direct base class. 1022 DirectBaseSpec = 0; 1023 for (CXXRecordDecl::base_class_const_iterator Base 1024 = ClassDecl->bases_begin(); 1025 Base != ClassDecl->bases_end(); ++Base) { 1026 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1027 // We found a direct base of this type. That's what we're 1028 // initializing. 1029 DirectBaseSpec = &*Base; 1030 break; 1031 } 1032 } 1033 1034 // Check for a virtual base class. 1035 // FIXME: We might be able to short-circuit this if we know in advance that 1036 // there are no virtual bases. 1037 VirtualBaseSpec = 0; 1038 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1039 // We haven't found a base yet; search the class hierarchy for a 1040 // virtual base class. 1041 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1042 /*DetectVirtual=*/false); 1043 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1044 BaseType, Paths)) { 1045 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1046 Path != Paths.end(); ++Path) { 1047 if (Path->back().Base->isVirtual()) { 1048 VirtualBaseSpec = Path->back().Base; 1049 break; 1050 } 1051 } 1052 } 1053 } 1054 1055 return DirectBaseSpec || VirtualBaseSpec; 1056} 1057 1058/// ActOnMemInitializer - Handle a C++ member initializer. 1059Sema::MemInitResult 1060Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1061 Scope *S, 1062 CXXScopeSpec &SS, 1063 IdentifierInfo *MemberOrBase, 1064 TypeTy *TemplateTypeTy, 1065 SourceLocation IdLoc, 1066 SourceLocation LParenLoc, 1067 ExprTy **Args, unsigned NumArgs, 1068 SourceLocation *CommaLocs, 1069 SourceLocation RParenLoc) { 1070 if (!ConstructorD) 1071 return true; 1072 1073 AdjustDeclIfTemplate(ConstructorD); 1074 1075 CXXConstructorDecl *Constructor 1076 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1077 if (!Constructor) { 1078 // The user wrote a constructor initializer on a function that is 1079 // not a C++ constructor. Ignore the error for now, because we may 1080 // have more member initializers coming; we'll diagnose it just 1081 // once in ActOnMemInitializers. 1082 return true; 1083 } 1084 1085 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1086 1087 // C++ [class.base.init]p2: 1088 // Names in a mem-initializer-id are looked up in the scope of the 1089 // constructor’s class and, if not found in that scope, are looked 1090 // up in the scope containing the constructor’s 1091 // definition. [Note: if the constructor’s class contains a member 1092 // with the same name as a direct or virtual base class of the 1093 // class, a mem-initializer-id naming the member or base class and 1094 // composed of a single identifier refers to the class member. A 1095 // mem-initializer-id for the hidden base class may be specified 1096 // using a qualified name. ] 1097 if (!SS.getScopeRep() && !TemplateTypeTy) { 1098 // Look for a member, first. 1099 FieldDecl *Member = 0; 1100 DeclContext::lookup_result Result 1101 = ClassDecl->lookup(MemberOrBase); 1102 if (Result.first != Result.second) 1103 Member = dyn_cast<FieldDecl>(*Result.first); 1104 1105 // FIXME: Handle members of an anonymous union. 1106 1107 if (Member) 1108 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1109 LParenLoc, RParenLoc); 1110 } 1111 // It didn't name a member, so see if it names a class. 1112 QualType BaseType; 1113 TypeSourceInfo *TInfo = 0; 1114 1115 if (TemplateTypeTy) { 1116 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1117 } else { 1118 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1119 LookupParsedName(R, S, &SS); 1120 1121 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1122 if (!TyD) { 1123 if (R.isAmbiguous()) return true; 1124 1125 // We don't want access-control diagnostics here. 1126 R.suppressDiagnostics(); 1127 1128 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1129 bool NotUnknownSpecialization = false; 1130 DeclContext *DC = computeDeclContext(SS, false); 1131 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1132 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1133 1134 if (!NotUnknownSpecialization) { 1135 // When the scope specifier can refer to a member of an unknown 1136 // specialization, we take it as a type name. 1137 BaseType = CheckTypenameType(ETK_None, 1138 (NestedNameSpecifier *)SS.getScopeRep(), 1139 *MemberOrBase, SourceLocation(), 1140 SS.getRange(), IdLoc); 1141 if (BaseType.isNull()) 1142 return true; 1143 1144 R.clear(); 1145 } 1146 } 1147 1148 // If no results were found, try to correct typos. 1149 if (R.empty() && BaseType.isNull() && 1150 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1151 R.isSingleResult()) { 1152 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1153 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1154 // We have found a non-static data member with a similar 1155 // name to what was typed; complain and initialize that 1156 // member. 1157 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1158 << MemberOrBase << true << R.getLookupName() 1159 << FixItHint::CreateReplacement(R.getNameLoc(), 1160 R.getLookupName().getAsString()); 1161 Diag(Member->getLocation(), diag::note_previous_decl) 1162 << Member->getDeclName(); 1163 1164 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1165 LParenLoc, RParenLoc); 1166 } 1167 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1168 const CXXBaseSpecifier *DirectBaseSpec; 1169 const CXXBaseSpecifier *VirtualBaseSpec; 1170 if (FindBaseInitializer(*this, ClassDecl, 1171 Context.getTypeDeclType(Type), 1172 DirectBaseSpec, VirtualBaseSpec)) { 1173 // We have found a direct or virtual base class with a 1174 // similar name to what was typed; complain and initialize 1175 // that base class. 1176 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1177 << MemberOrBase << false << R.getLookupName() 1178 << FixItHint::CreateReplacement(R.getNameLoc(), 1179 R.getLookupName().getAsString()); 1180 1181 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1182 : VirtualBaseSpec; 1183 Diag(BaseSpec->getSourceRange().getBegin(), 1184 diag::note_base_class_specified_here) 1185 << BaseSpec->getType() 1186 << BaseSpec->getSourceRange(); 1187 1188 TyD = Type; 1189 } 1190 } 1191 } 1192 1193 if (!TyD && BaseType.isNull()) { 1194 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1195 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1196 return true; 1197 } 1198 } 1199 1200 if (BaseType.isNull()) { 1201 BaseType = Context.getTypeDeclType(TyD); 1202 if (SS.isSet()) { 1203 NestedNameSpecifier *Qualifier = 1204 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1205 1206 // FIXME: preserve source range information 1207 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1208 } 1209 } 1210 } 1211 1212 if (!TInfo) 1213 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1214 1215 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1216 LParenLoc, RParenLoc, ClassDecl); 1217} 1218 1219/// Checks an initializer expression for use of uninitialized fields, such as 1220/// containing the field that is being initialized. Returns true if there is an 1221/// uninitialized field was used an updates the SourceLocation parameter; false 1222/// otherwise. 1223static bool InitExprContainsUninitializedFields(const Stmt* S, 1224 const FieldDecl* LhsField, 1225 SourceLocation* L) { 1226 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1227 if (ME) { 1228 const NamedDecl* RhsField = ME->getMemberDecl(); 1229 if (RhsField == LhsField) { 1230 // Initializing a field with itself. Throw a warning. 1231 // But wait; there are exceptions! 1232 // Exception #1: The field may not belong to this record. 1233 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1234 const Expr* base = ME->getBase(); 1235 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1236 // Even though the field matches, it does not belong to this record. 1237 return false; 1238 } 1239 // None of the exceptions triggered; return true to indicate an 1240 // uninitialized field was used. 1241 *L = ME->getMemberLoc(); 1242 return true; 1243 } 1244 } 1245 bool found = false; 1246 for (Stmt::const_child_iterator it = S->child_begin(); 1247 it != S->child_end() && found == false; 1248 ++it) { 1249 if (isa<CallExpr>(S)) { 1250 // Do not descend into function calls or constructors, as the use 1251 // of an uninitialized field may be valid. One would have to inspect 1252 // the contents of the function/ctor to determine if it is safe or not. 1253 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1254 // may be safe, depending on what the function/ctor does. 1255 continue; 1256 } 1257 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1258 } 1259 return found; 1260} 1261 1262Sema::MemInitResult 1263Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1264 unsigned NumArgs, SourceLocation IdLoc, 1265 SourceLocation LParenLoc, 1266 SourceLocation RParenLoc) { 1267 // Diagnose value-uses of fields to initialize themselves, e.g. 1268 // foo(foo) 1269 // where foo is not also a parameter to the constructor. 1270 // TODO: implement -Wuninitialized and fold this into that framework. 1271 for (unsigned i = 0; i < NumArgs; ++i) { 1272 SourceLocation L; 1273 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1274 // FIXME: Return true in the case when other fields are used before being 1275 // uninitialized. For example, let this field be the i'th field. When 1276 // initializing the i'th field, throw a warning if any of the >= i'th 1277 // fields are used, as they are not yet initialized. 1278 // Right now we are only handling the case where the i'th field uses 1279 // itself in its initializer. 1280 Diag(L, diag::warn_field_is_uninit); 1281 } 1282 } 1283 1284 bool HasDependentArg = false; 1285 for (unsigned i = 0; i < NumArgs; i++) 1286 HasDependentArg |= Args[i]->isTypeDependent(); 1287 1288 QualType FieldType = Member->getType(); 1289 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1290 FieldType = Array->getElementType(); 1291 if (FieldType->isDependentType() || HasDependentArg) { 1292 // Can't check initialization for a member of dependent type or when 1293 // any of the arguments are type-dependent expressions. 1294 OwningExprResult Init 1295 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1296 RParenLoc)); 1297 1298 // Erase any temporaries within this evaluation context; we're not 1299 // going to track them in the AST, since we'll be rebuilding the 1300 // ASTs during template instantiation. 1301 ExprTemporaries.erase( 1302 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1303 ExprTemporaries.end()); 1304 1305 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1306 LParenLoc, 1307 Init.takeAs<Expr>(), 1308 RParenLoc); 1309 1310 } 1311 1312 if (Member->isInvalidDecl()) 1313 return true; 1314 1315 // Initialize the member. 1316 InitializedEntity MemberEntity = 1317 InitializedEntity::InitializeMember(Member, 0); 1318 InitializationKind Kind = 1319 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1320 1321 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1322 1323 OwningExprResult MemberInit = 1324 InitSeq.Perform(*this, MemberEntity, Kind, 1325 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1326 if (MemberInit.isInvalid()) 1327 return true; 1328 1329 // C++0x [class.base.init]p7: 1330 // The initialization of each base and member constitutes a 1331 // full-expression. 1332 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1333 if (MemberInit.isInvalid()) 1334 return true; 1335 1336 // If we are in a dependent context, template instantiation will 1337 // perform this type-checking again. Just save the arguments that we 1338 // received in a ParenListExpr. 1339 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1340 // of the information that we have about the member 1341 // initializer. However, deconstructing the ASTs is a dicey process, 1342 // and this approach is far more likely to get the corner cases right. 1343 if (CurContext->isDependentContext()) { 1344 // Bump the reference count of all of the arguments. 1345 for (unsigned I = 0; I != NumArgs; ++I) 1346 Args[I]->Retain(); 1347 1348 OwningExprResult Init 1349 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1350 RParenLoc)); 1351 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1352 LParenLoc, 1353 Init.takeAs<Expr>(), 1354 RParenLoc); 1355 } 1356 1357 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1358 LParenLoc, 1359 MemberInit.takeAs<Expr>(), 1360 RParenLoc); 1361} 1362 1363Sema::MemInitResult 1364Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1365 Expr **Args, unsigned NumArgs, 1366 SourceLocation LParenLoc, SourceLocation RParenLoc, 1367 CXXRecordDecl *ClassDecl) { 1368 bool HasDependentArg = false; 1369 for (unsigned i = 0; i < NumArgs; i++) 1370 HasDependentArg |= Args[i]->isTypeDependent(); 1371 1372 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1373 if (BaseType->isDependentType() || HasDependentArg) { 1374 // Can't check initialization for a base of dependent type or when 1375 // any of the arguments are type-dependent expressions. 1376 OwningExprResult BaseInit 1377 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1378 RParenLoc)); 1379 1380 // Erase any temporaries within this evaluation context; we're not 1381 // going to track them in the AST, since we'll be rebuilding the 1382 // ASTs during template instantiation. 1383 ExprTemporaries.erase( 1384 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1385 ExprTemporaries.end()); 1386 1387 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1388 /*IsVirtual=*/false, 1389 LParenLoc, 1390 BaseInit.takeAs<Expr>(), 1391 RParenLoc); 1392 } 1393 1394 if (!BaseType->isRecordType()) 1395 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1396 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1397 1398 // C++ [class.base.init]p2: 1399 // [...] Unless the mem-initializer-id names a nonstatic data 1400 // member of the constructor’s class or a direct or virtual base 1401 // of that class, the mem-initializer is ill-formed. A 1402 // mem-initializer-list can initialize a base class using any 1403 // name that denotes that base class type. 1404 1405 // Check for direct and virtual base classes. 1406 const CXXBaseSpecifier *DirectBaseSpec = 0; 1407 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1408 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1409 VirtualBaseSpec); 1410 1411 // C++ [base.class.init]p2: 1412 // If a mem-initializer-id is ambiguous because it designates both 1413 // a direct non-virtual base class and an inherited virtual base 1414 // class, the mem-initializer is ill-formed. 1415 if (DirectBaseSpec && VirtualBaseSpec) 1416 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1417 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1418 // C++ [base.class.init]p2: 1419 // Unless the mem-initializer-id names a nonstatic data membeer of the 1420 // constructor's class ot a direst or virtual base of that class, the 1421 // mem-initializer is ill-formed. 1422 if (!DirectBaseSpec && !VirtualBaseSpec) 1423 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1424 << BaseType << Context.getTypeDeclType(ClassDecl) 1425 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1426 1427 CXXBaseSpecifier *BaseSpec 1428 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1429 if (!BaseSpec) 1430 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1431 1432 // Initialize the base. 1433 InitializedEntity BaseEntity = 1434 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1435 InitializationKind Kind = 1436 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1437 1438 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1439 1440 OwningExprResult BaseInit = 1441 InitSeq.Perform(*this, BaseEntity, Kind, 1442 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1443 if (BaseInit.isInvalid()) 1444 return true; 1445 1446 // C++0x [class.base.init]p7: 1447 // The initialization of each base and member constitutes a 1448 // full-expression. 1449 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1450 if (BaseInit.isInvalid()) 1451 return true; 1452 1453 // If we are in a dependent context, template instantiation will 1454 // perform this type-checking again. Just save the arguments that we 1455 // received in a ParenListExpr. 1456 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1457 // of the information that we have about the base 1458 // initializer. However, deconstructing the ASTs is a dicey process, 1459 // and this approach is far more likely to get the corner cases right. 1460 if (CurContext->isDependentContext()) { 1461 // Bump the reference count of all of the arguments. 1462 for (unsigned I = 0; I != NumArgs; ++I) 1463 Args[I]->Retain(); 1464 1465 OwningExprResult Init 1466 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1467 RParenLoc)); 1468 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1469 BaseSpec->isVirtual(), 1470 LParenLoc, 1471 Init.takeAs<Expr>(), 1472 RParenLoc); 1473 } 1474 1475 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1476 BaseSpec->isVirtual(), 1477 LParenLoc, 1478 BaseInit.takeAs<Expr>(), 1479 RParenLoc); 1480} 1481 1482/// ImplicitInitializerKind - How an implicit base or member initializer should 1483/// initialize its base or member. 1484enum ImplicitInitializerKind { 1485 IIK_Default, 1486 IIK_Copy, 1487 IIK_Move 1488}; 1489 1490static bool 1491BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1492 ImplicitInitializerKind ImplicitInitKind, 1493 CXXBaseSpecifier *BaseSpec, 1494 bool IsInheritedVirtualBase, 1495 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1496 InitializedEntity InitEntity 1497 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1498 IsInheritedVirtualBase); 1499 1500 Sema::OwningExprResult BaseInit(SemaRef); 1501 1502 switch (ImplicitInitKind) { 1503 case IIK_Default: { 1504 InitializationKind InitKind 1505 = InitializationKind::CreateDefault(Constructor->getLocation()); 1506 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1507 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1508 Sema::MultiExprArg(SemaRef, 0, 0)); 1509 break; 1510 } 1511 1512 case IIK_Copy: { 1513 ParmVarDecl *Param = Constructor->getParamDecl(0); 1514 QualType ParamType = Param->getType().getNonReferenceType(); 1515 1516 Expr *CopyCtorArg = 1517 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1518 Constructor->getLocation(), ParamType, 0); 1519 1520 // Cast to the base class to avoid ambiguities. 1521 QualType ArgTy = 1522 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1523 ParamType.getQualifiers()); 1524 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1525 CastExpr::CK_UncheckedDerivedToBase, 1526 /*isLvalue=*/true, 1527 CXXBaseSpecifierArray(BaseSpec)); 1528 1529 InitializationKind InitKind 1530 = InitializationKind::CreateDirect(Constructor->getLocation(), 1531 SourceLocation(), SourceLocation()); 1532 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1533 &CopyCtorArg, 1); 1534 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1535 Sema::MultiExprArg(SemaRef, 1536 (void**)&CopyCtorArg, 1)); 1537 break; 1538 } 1539 1540 case IIK_Move: 1541 assert(false && "Unhandled initializer kind!"); 1542 } 1543 1544 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1545 if (BaseInit.isInvalid()) 1546 return true; 1547 1548 CXXBaseInit = 1549 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1550 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1551 SourceLocation()), 1552 BaseSpec->isVirtual(), 1553 SourceLocation(), 1554 BaseInit.takeAs<Expr>(), 1555 SourceLocation()); 1556 1557 return false; 1558} 1559 1560static bool 1561BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1562 ImplicitInitializerKind ImplicitInitKind, 1563 FieldDecl *Field, 1564 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1565 if (Field->isInvalidDecl()) 1566 return true; 1567 1568 if (ImplicitInitKind == IIK_Copy) { 1569 SourceLocation Loc = Constructor->getLocation(); 1570 ParmVarDecl *Param = Constructor->getParamDecl(0); 1571 QualType ParamType = Param->getType().getNonReferenceType(); 1572 1573 Expr *MemberExprBase = 1574 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1575 Loc, ParamType, 0); 1576 1577 // Build a reference to this field within the parameter. 1578 CXXScopeSpec SS; 1579 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1580 Sema::LookupMemberName); 1581 MemberLookup.addDecl(Field, AS_public); 1582 MemberLookup.resolveKind(); 1583 Sema::OwningExprResult CopyCtorArg 1584 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1585 ParamType, Loc, 1586 /*IsArrow=*/false, 1587 SS, 1588 /*FirstQualifierInScope=*/0, 1589 MemberLookup, 1590 /*TemplateArgs=*/0); 1591 if (CopyCtorArg.isInvalid()) 1592 return true; 1593 1594 // When the field we are copying is an array, create index variables for 1595 // each dimension of the array. We use these index variables to subscript 1596 // the source array, and other clients (e.g., CodeGen) will perform the 1597 // necessary iteration with these index variables. 1598 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1599 QualType BaseType = Field->getType(); 1600 QualType SizeType = SemaRef.Context.getSizeType(); 1601 while (const ConstantArrayType *Array 1602 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1603 // Create the iteration variable for this array index. 1604 IdentifierInfo *IterationVarName = 0; 1605 { 1606 llvm::SmallString<8> Str; 1607 llvm::raw_svector_ostream OS(Str); 1608 OS << "__i" << IndexVariables.size(); 1609 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1610 } 1611 VarDecl *IterationVar 1612 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1613 IterationVarName, SizeType, 1614 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1615 VarDecl::None, VarDecl::None); 1616 IndexVariables.push_back(IterationVar); 1617 1618 // Create a reference to the iteration variable. 1619 Sema::OwningExprResult IterationVarRef 1620 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1621 assert(!IterationVarRef.isInvalid() && 1622 "Reference to invented variable cannot fail!"); 1623 1624 // Subscript the array with this iteration variable. 1625 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1626 Loc, 1627 move(IterationVarRef), 1628 Loc); 1629 if (CopyCtorArg.isInvalid()) 1630 return true; 1631 1632 BaseType = Array->getElementType(); 1633 } 1634 1635 // Construct the entity that we will be initializing. For an array, this 1636 // will be first element in the array, which may require several levels 1637 // of array-subscript entities. 1638 llvm::SmallVector<InitializedEntity, 4> Entities; 1639 Entities.reserve(1 + IndexVariables.size()); 1640 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1641 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1642 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1643 0, 1644 Entities.back())); 1645 1646 // Direct-initialize to use the copy constructor. 1647 InitializationKind InitKind = 1648 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1649 1650 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1651 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1652 &CopyCtorArgE, 1); 1653 1654 Sema::OwningExprResult MemberInit 1655 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1656 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1657 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1658 if (MemberInit.isInvalid()) 1659 return true; 1660 1661 CXXMemberInit 1662 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1663 MemberInit.takeAs<Expr>(), Loc, 1664 IndexVariables.data(), 1665 IndexVariables.size()); 1666 return false; 1667 } 1668 1669 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1670 1671 QualType FieldBaseElementType = 1672 SemaRef.Context.getBaseElementType(Field->getType()); 1673 1674 if (FieldBaseElementType->isRecordType()) { 1675 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1676 InitializationKind InitKind = 1677 InitializationKind::CreateDefault(Constructor->getLocation()); 1678 1679 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1680 Sema::OwningExprResult MemberInit = 1681 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1682 Sema::MultiExprArg(SemaRef, 0, 0)); 1683 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1684 if (MemberInit.isInvalid()) 1685 return true; 1686 1687 CXXMemberInit = 1688 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1689 Field, SourceLocation(), 1690 SourceLocation(), 1691 MemberInit.takeAs<Expr>(), 1692 SourceLocation()); 1693 return false; 1694 } 1695 1696 if (FieldBaseElementType->isReferenceType()) { 1697 SemaRef.Diag(Constructor->getLocation(), 1698 diag::err_uninitialized_member_in_ctor) 1699 << (int)Constructor->isImplicit() 1700 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1701 << 0 << Field->getDeclName(); 1702 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1703 return true; 1704 } 1705 1706 if (FieldBaseElementType.isConstQualified()) { 1707 SemaRef.Diag(Constructor->getLocation(), 1708 diag::err_uninitialized_member_in_ctor) 1709 << (int)Constructor->isImplicit() 1710 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1711 << 1 << Field->getDeclName(); 1712 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1713 return true; 1714 } 1715 1716 // Nothing to initialize. 1717 CXXMemberInit = 0; 1718 return false; 1719} 1720 1721namespace { 1722struct BaseAndFieldInfo { 1723 Sema &S; 1724 CXXConstructorDecl *Ctor; 1725 bool AnyErrorsInInits; 1726 ImplicitInitializerKind IIK; 1727 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1728 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1729 1730 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1731 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1732 // FIXME: Handle implicit move constructors. 1733 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1734 IIK = IIK_Copy; 1735 else 1736 IIK = IIK_Default; 1737 } 1738}; 1739} 1740 1741static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1742 FieldDecl *Top, FieldDecl *Field) { 1743 1744 // Overwhelmingly common case: we have a direct initializer for this field. 1745 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1746 Info.AllToInit.push_back(Init); 1747 1748 if (Field != Top) { 1749 Init->setMember(Top); 1750 Init->setAnonUnionMember(Field); 1751 } 1752 return false; 1753 } 1754 1755 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1756 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1757 assert(FieldClassType && "anonymous struct/union without record type"); 1758 1759 // Walk through the members, tying in any initializers for fields 1760 // we find. The earlier semantic checks should prevent redundant 1761 // initialization of union members, given the requirement that 1762 // union members never have non-trivial default constructors. 1763 1764 // TODO: in C++0x, it might be legal to have union members with 1765 // non-trivial default constructors in unions. Revise this 1766 // implementation then with the appropriate semantics. 1767 CXXRecordDecl *FieldClassDecl 1768 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1769 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1770 EA = FieldClassDecl->field_end(); FA != EA; FA++) 1771 if (CollectFieldInitializer(Info, Top, *FA)) 1772 return true; 1773 } 1774 1775 // Don't try to build an implicit initializer if there were semantic 1776 // errors in any of the initializers (and therefore we might be 1777 // missing some that the user actually wrote). 1778 if (Info.AnyErrorsInInits) 1779 return false; 1780 1781 CXXBaseOrMemberInitializer *Init = 0; 1782 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1783 return true; 1784 1785 // If the member doesn't need to be initialized, Init will still be null. 1786 if (!Init) return false; 1787 1788 Info.AllToInit.push_back(Init); 1789 if (Top != Field) { 1790 Init->setMember(Top); 1791 Init->setAnonUnionMember(Field); 1792 } 1793 return false; 1794} 1795 1796bool 1797Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1798 CXXBaseOrMemberInitializer **Initializers, 1799 unsigned NumInitializers, 1800 bool AnyErrors) { 1801 if (Constructor->getDeclContext()->isDependentContext()) { 1802 // Just store the initializers as written, they will be checked during 1803 // instantiation. 1804 if (NumInitializers > 0) { 1805 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1806 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1807 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1808 memcpy(baseOrMemberInitializers, Initializers, 1809 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1810 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1811 } 1812 1813 return false; 1814 } 1815 1816 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1817 1818 // We need to build the initializer AST according to order of construction 1819 // and not what user specified in the Initializers list. 1820 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1821 if (!ClassDecl) 1822 return true; 1823 1824 bool HadError = false; 1825 1826 for (unsigned i = 0; i < NumInitializers; i++) { 1827 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1828 1829 if (Member->isBaseInitializer()) 1830 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1831 else 1832 Info.AllBaseFields[Member->getMember()] = Member; 1833 } 1834 1835 // Keep track of the direct virtual bases. 1836 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1837 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1838 E = ClassDecl->bases_end(); I != E; ++I) { 1839 if (I->isVirtual()) 1840 DirectVBases.insert(I); 1841 } 1842 1843 // Push virtual bases before others. 1844 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1845 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1846 1847 if (CXXBaseOrMemberInitializer *Value 1848 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1849 Info.AllToInit.push_back(Value); 1850 } else if (!AnyErrors) { 1851 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1852 CXXBaseOrMemberInitializer *CXXBaseInit; 1853 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1854 VBase, IsInheritedVirtualBase, 1855 CXXBaseInit)) { 1856 HadError = true; 1857 continue; 1858 } 1859 1860 Info.AllToInit.push_back(CXXBaseInit); 1861 } 1862 } 1863 1864 // Non-virtual bases. 1865 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1866 E = ClassDecl->bases_end(); Base != E; ++Base) { 1867 // Virtuals are in the virtual base list and already constructed. 1868 if (Base->isVirtual()) 1869 continue; 1870 1871 if (CXXBaseOrMemberInitializer *Value 1872 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1873 Info.AllToInit.push_back(Value); 1874 } else if (!AnyErrors) { 1875 CXXBaseOrMemberInitializer *CXXBaseInit; 1876 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1877 Base, /*IsInheritedVirtualBase=*/false, 1878 CXXBaseInit)) { 1879 HadError = true; 1880 continue; 1881 } 1882 1883 Info.AllToInit.push_back(CXXBaseInit); 1884 } 1885 } 1886 1887 // Fields. 1888 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1889 E = ClassDecl->field_end(); Field != E; ++Field) 1890 if (CollectFieldInitializer(Info, *Field, *Field)) 1891 HadError = true; 1892 1893 NumInitializers = Info.AllToInit.size(); 1894 if (NumInitializers > 0) { 1895 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1896 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1897 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1898 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1899 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1900 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1901 1902 // Constructors implicitly reference the base and member 1903 // destructors. 1904 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1905 Constructor->getParent()); 1906 } 1907 1908 return HadError; 1909} 1910 1911static void *GetKeyForTopLevelField(FieldDecl *Field) { 1912 // For anonymous unions, use the class declaration as the key. 1913 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1914 if (RT->getDecl()->isAnonymousStructOrUnion()) 1915 return static_cast<void *>(RT->getDecl()); 1916 } 1917 return static_cast<void *>(Field); 1918} 1919 1920static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1921 return Context.getCanonicalType(BaseType).getTypePtr(); 1922} 1923 1924static void *GetKeyForMember(ASTContext &Context, 1925 CXXBaseOrMemberInitializer *Member, 1926 bool MemberMaybeAnon = false) { 1927 if (!Member->isMemberInitializer()) 1928 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1929 1930 // For fields injected into the class via declaration of an anonymous union, 1931 // use its anonymous union class declaration as the unique key. 1932 FieldDecl *Field = Member->getMember(); 1933 1934 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1935 // data member of the class. Data member used in the initializer list is 1936 // in AnonUnionMember field. 1937 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1938 Field = Member->getAnonUnionMember(); 1939 1940 // If the field is a member of an anonymous struct or union, our key 1941 // is the anonymous record decl that's a direct child of the class. 1942 RecordDecl *RD = Field->getParent(); 1943 if (RD->isAnonymousStructOrUnion()) { 1944 while (true) { 1945 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1946 if (Parent->isAnonymousStructOrUnion()) 1947 RD = Parent; 1948 else 1949 break; 1950 } 1951 1952 return static_cast<void *>(RD); 1953 } 1954 1955 return static_cast<void *>(Field); 1956} 1957 1958static void 1959DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1960 const CXXConstructorDecl *Constructor, 1961 CXXBaseOrMemberInitializer **Inits, 1962 unsigned NumInits) { 1963 if (Constructor->getDeclContext()->isDependentContext()) 1964 return; 1965 1966 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1967 == Diagnostic::Ignored) 1968 return; 1969 1970 // Build the list of bases and members in the order that they'll 1971 // actually be initialized. The explicit initializers should be in 1972 // this same order but may be missing things. 1973 llvm::SmallVector<const void*, 32> IdealInitKeys; 1974 1975 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1976 1977 // 1. Virtual bases. 1978 for (CXXRecordDecl::base_class_const_iterator VBase = 1979 ClassDecl->vbases_begin(), 1980 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1981 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1982 1983 // 2. Non-virtual bases. 1984 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1985 E = ClassDecl->bases_end(); Base != E; ++Base) { 1986 if (Base->isVirtual()) 1987 continue; 1988 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1989 } 1990 1991 // 3. Direct fields. 1992 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1993 E = ClassDecl->field_end(); Field != E; ++Field) 1994 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1995 1996 unsigned NumIdealInits = IdealInitKeys.size(); 1997 unsigned IdealIndex = 0; 1998 1999 CXXBaseOrMemberInitializer *PrevInit = 0; 2000 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2001 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2002 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2003 2004 // Scan forward to try to find this initializer in the idealized 2005 // initializers list. 2006 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2007 if (InitKey == IdealInitKeys[IdealIndex]) 2008 break; 2009 2010 // If we didn't find this initializer, it must be because we 2011 // scanned past it on a previous iteration. That can only 2012 // happen if we're out of order; emit a warning. 2013 if (IdealIndex == NumIdealInits) { 2014 assert(PrevInit && "initializer not found in initializer list"); 2015 2016 Sema::SemaDiagnosticBuilder D = 2017 SemaRef.Diag(PrevInit->getSourceLocation(), 2018 diag::warn_initializer_out_of_order); 2019 2020 if (PrevInit->isMemberInitializer()) 2021 D << 0 << PrevInit->getMember()->getDeclName(); 2022 else 2023 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2024 2025 if (Init->isMemberInitializer()) 2026 D << 0 << Init->getMember()->getDeclName(); 2027 else 2028 D << 1 << Init->getBaseClassInfo()->getType(); 2029 2030 // Move back to the initializer's location in the ideal list. 2031 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2032 if (InitKey == IdealInitKeys[IdealIndex]) 2033 break; 2034 2035 assert(IdealIndex != NumIdealInits && 2036 "initializer not found in initializer list"); 2037 } 2038 2039 PrevInit = Init; 2040 } 2041} 2042 2043namespace { 2044bool CheckRedundantInit(Sema &S, 2045 CXXBaseOrMemberInitializer *Init, 2046 CXXBaseOrMemberInitializer *&PrevInit) { 2047 if (!PrevInit) { 2048 PrevInit = Init; 2049 return false; 2050 } 2051 2052 if (FieldDecl *Field = Init->getMember()) 2053 S.Diag(Init->getSourceLocation(), 2054 diag::err_multiple_mem_initialization) 2055 << Field->getDeclName() 2056 << Init->getSourceRange(); 2057 else { 2058 Type *BaseClass = Init->getBaseClass(); 2059 assert(BaseClass && "neither field nor base"); 2060 S.Diag(Init->getSourceLocation(), 2061 diag::err_multiple_base_initialization) 2062 << QualType(BaseClass, 0) 2063 << Init->getSourceRange(); 2064 } 2065 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2066 << 0 << PrevInit->getSourceRange(); 2067 2068 return true; 2069} 2070 2071typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2072typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2073 2074bool CheckRedundantUnionInit(Sema &S, 2075 CXXBaseOrMemberInitializer *Init, 2076 RedundantUnionMap &Unions) { 2077 FieldDecl *Field = Init->getMember(); 2078 RecordDecl *Parent = Field->getParent(); 2079 if (!Parent->isAnonymousStructOrUnion()) 2080 return false; 2081 2082 NamedDecl *Child = Field; 2083 do { 2084 if (Parent->isUnion()) { 2085 UnionEntry &En = Unions[Parent]; 2086 if (En.first && En.first != Child) { 2087 S.Diag(Init->getSourceLocation(), 2088 diag::err_multiple_mem_union_initialization) 2089 << Field->getDeclName() 2090 << Init->getSourceRange(); 2091 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2092 << 0 << En.second->getSourceRange(); 2093 return true; 2094 } else if (!En.first) { 2095 En.first = Child; 2096 En.second = Init; 2097 } 2098 } 2099 2100 Child = Parent; 2101 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2102 } while (Parent->isAnonymousStructOrUnion()); 2103 2104 return false; 2105} 2106} 2107 2108/// ActOnMemInitializers - Handle the member initializers for a constructor. 2109void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2110 SourceLocation ColonLoc, 2111 MemInitTy **meminits, unsigned NumMemInits, 2112 bool AnyErrors) { 2113 if (!ConstructorDecl) 2114 return; 2115 2116 AdjustDeclIfTemplate(ConstructorDecl); 2117 2118 CXXConstructorDecl *Constructor 2119 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2120 2121 if (!Constructor) { 2122 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2123 return; 2124 } 2125 2126 CXXBaseOrMemberInitializer **MemInits = 2127 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2128 2129 // Mapping for the duplicate initializers check. 2130 // For member initializers, this is keyed with a FieldDecl*. 2131 // For base initializers, this is keyed with a Type*. 2132 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2133 2134 // Mapping for the inconsistent anonymous-union initializers check. 2135 RedundantUnionMap MemberUnions; 2136 2137 bool HadError = false; 2138 for (unsigned i = 0; i < NumMemInits; i++) { 2139 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2140 2141 if (Init->isMemberInitializer()) { 2142 FieldDecl *Field = Init->getMember(); 2143 if (CheckRedundantInit(*this, Init, Members[Field]) || 2144 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2145 HadError = true; 2146 } else { 2147 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2148 if (CheckRedundantInit(*this, Init, Members[Key])) 2149 HadError = true; 2150 } 2151 } 2152 2153 if (HadError) 2154 return; 2155 2156 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2157 2158 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2159} 2160 2161void 2162Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2163 CXXRecordDecl *ClassDecl) { 2164 // Ignore dependent contexts. 2165 if (ClassDecl->isDependentContext()) 2166 return; 2167 2168 // FIXME: all the access-control diagnostics are positioned on the 2169 // field/base declaration. That's probably good; that said, the 2170 // user might reasonably want to know why the destructor is being 2171 // emitted, and we currently don't say. 2172 2173 // Non-static data members. 2174 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2175 E = ClassDecl->field_end(); I != E; ++I) { 2176 FieldDecl *Field = *I; 2177 if (Field->isInvalidDecl()) 2178 continue; 2179 QualType FieldType = Context.getBaseElementType(Field->getType()); 2180 2181 const RecordType* RT = FieldType->getAs<RecordType>(); 2182 if (!RT) 2183 continue; 2184 2185 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2186 if (FieldClassDecl->hasTrivialDestructor()) 2187 continue; 2188 2189 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2190 CheckDestructorAccess(Field->getLocation(), Dtor, 2191 PDiag(diag::err_access_dtor_field) 2192 << Field->getDeclName() 2193 << FieldType); 2194 2195 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2196 } 2197 2198 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2199 2200 // Bases. 2201 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2202 E = ClassDecl->bases_end(); Base != E; ++Base) { 2203 // Bases are always records in a well-formed non-dependent class. 2204 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2205 2206 // Remember direct virtual bases. 2207 if (Base->isVirtual()) 2208 DirectVirtualBases.insert(RT); 2209 2210 // Ignore trivial destructors. 2211 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2212 if (BaseClassDecl->hasTrivialDestructor()) 2213 continue; 2214 2215 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2216 2217 // FIXME: caret should be on the start of the class name 2218 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2219 PDiag(diag::err_access_dtor_base) 2220 << Base->getType() 2221 << Base->getSourceRange()); 2222 2223 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2224 } 2225 2226 // Virtual bases. 2227 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2228 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2229 2230 // Bases are always records in a well-formed non-dependent class. 2231 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2232 2233 // Ignore direct virtual bases. 2234 if (DirectVirtualBases.count(RT)) 2235 continue; 2236 2237 // Ignore trivial destructors. 2238 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2239 if (BaseClassDecl->hasTrivialDestructor()) 2240 continue; 2241 2242 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2243 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2244 PDiag(diag::err_access_dtor_vbase) 2245 << VBase->getType()); 2246 2247 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2248 } 2249} 2250 2251void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2252 if (!CDtorDecl) 2253 return; 2254 2255 if (CXXConstructorDecl *Constructor 2256 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2257 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2258} 2259 2260bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2261 unsigned DiagID, AbstractDiagSelID SelID, 2262 const CXXRecordDecl *CurrentRD) { 2263 if (SelID == -1) 2264 return RequireNonAbstractType(Loc, T, 2265 PDiag(DiagID), CurrentRD); 2266 else 2267 return RequireNonAbstractType(Loc, T, 2268 PDiag(DiagID) << SelID, CurrentRD); 2269} 2270 2271bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2272 const PartialDiagnostic &PD, 2273 const CXXRecordDecl *CurrentRD) { 2274 if (!getLangOptions().CPlusPlus) 2275 return false; 2276 2277 if (const ArrayType *AT = Context.getAsArrayType(T)) 2278 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2279 CurrentRD); 2280 2281 if (const PointerType *PT = T->getAs<PointerType>()) { 2282 // Find the innermost pointer type. 2283 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2284 PT = T; 2285 2286 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2287 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2288 } 2289 2290 const RecordType *RT = T->getAs<RecordType>(); 2291 if (!RT) 2292 return false; 2293 2294 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2295 2296 if (CurrentRD && CurrentRD != RD) 2297 return false; 2298 2299 // FIXME: is this reasonable? It matches current behavior, but.... 2300 if (!RD->getDefinition()) 2301 return false; 2302 2303 if (!RD->isAbstract()) 2304 return false; 2305 2306 Diag(Loc, PD) << RD->getDeclName(); 2307 2308 // Check if we've already emitted the list of pure virtual functions for this 2309 // class. 2310 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2311 return true; 2312 2313 CXXFinalOverriderMap FinalOverriders; 2314 RD->getFinalOverriders(FinalOverriders); 2315 2316 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2317 MEnd = FinalOverriders.end(); 2318 M != MEnd; 2319 ++M) { 2320 for (OverridingMethods::iterator SO = M->second.begin(), 2321 SOEnd = M->second.end(); 2322 SO != SOEnd; ++SO) { 2323 // C++ [class.abstract]p4: 2324 // A class is abstract if it contains or inherits at least one 2325 // pure virtual function for which the final overrider is pure 2326 // virtual. 2327 2328 // 2329 if (SO->second.size() != 1) 2330 continue; 2331 2332 if (!SO->second.front().Method->isPure()) 2333 continue; 2334 2335 Diag(SO->second.front().Method->getLocation(), 2336 diag::note_pure_virtual_function) 2337 << SO->second.front().Method->getDeclName(); 2338 } 2339 } 2340 2341 if (!PureVirtualClassDiagSet) 2342 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2343 PureVirtualClassDiagSet->insert(RD); 2344 2345 return true; 2346} 2347 2348namespace { 2349 class AbstractClassUsageDiagnoser 2350 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2351 Sema &SemaRef; 2352 CXXRecordDecl *AbstractClass; 2353 2354 bool VisitDeclContext(const DeclContext *DC) { 2355 bool Invalid = false; 2356 2357 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2358 E = DC->decls_end(); I != E; ++I) 2359 Invalid |= Visit(*I); 2360 2361 return Invalid; 2362 } 2363 2364 public: 2365 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2366 : SemaRef(SemaRef), AbstractClass(ac) { 2367 Visit(SemaRef.Context.getTranslationUnitDecl()); 2368 } 2369 2370 bool VisitFunctionDecl(const FunctionDecl *FD) { 2371 if (FD->isThisDeclarationADefinition()) { 2372 // No need to do the check if we're in a definition, because it requires 2373 // that the return/param types are complete. 2374 // because that requires 2375 return VisitDeclContext(FD); 2376 } 2377 2378 // Check the return type. 2379 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2380 bool Invalid = 2381 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2382 diag::err_abstract_type_in_decl, 2383 Sema::AbstractReturnType, 2384 AbstractClass); 2385 2386 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2387 E = FD->param_end(); I != E; ++I) { 2388 const ParmVarDecl *VD = *I; 2389 Invalid |= 2390 SemaRef.RequireNonAbstractType(VD->getLocation(), 2391 VD->getOriginalType(), 2392 diag::err_abstract_type_in_decl, 2393 Sema::AbstractParamType, 2394 AbstractClass); 2395 } 2396 2397 return Invalid; 2398 } 2399 2400 bool VisitDecl(const Decl* D) { 2401 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2402 return VisitDeclContext(DC); 2403 2404 return false; 2405 } 2406 }; 2407} 2408 2409/// \brief Perform semantic checks on a class definition that has been 2410/// completing, introducing implicitly-declared members, checking for 2411/// abstract types, etc. 2412void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2413 if (!Record || Record->isInvalidDecl()) 2414 return; 2415 2416 if (!Record->isDependentType()) 2417 AddImplicitlyDeclaredMembersToClass(S, Record); 2418 2419 if (Record->isInvalidDecl()) 2420 return; 2421 2422 // Set access bits correctly on the directly-declared conversions. 2423 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2424 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2425 Convs->setAccess(I, (*I)->getAccess()); 2426 2427 // Determine whether we need to check for final overriders. We do 2428 // this either when there are virtual base classes (in which case we 2429 // may end up finding multiple final overriders for a given virtual 2430 // function) or any of the base classes is abstract (in which case 2431 // we might detect that this class is abstract). 2432 bool CheckFinalOverriders = false; 2433 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2434 !Record->isDependentType()) { 2435 if (Record->getNumVBases()) 2436 CheckFinalOverriders = true; 2437 else if (!Record->isAbstract()) { 2438 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2439 BEnd = Record->bases_end(); 2440 B != BEnd; ++B) { 2441 CXXRecordDecl *BaseDecl 2442 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2443 if (BaseDecl->isAbstract()) { 2444 CheckFinalOverriders = true; 2445 break; 2446 } 2447 } 2448 } 2449 } 2450 2451 if (CheckFinalOverriders) { 2452 CXXFinalOverriderMap FinalOverriders; 2453 Record->getFinalOverriders(FinalOverriders); 2454 2455 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2456 MEnd = FinalOverriders.end(); 2457 M != MEnd; ++M) { 2458 for (OverridingMethods::iterator SO = M->second.begin(), 2459 SOEnd = M->second.end(); 2460 SO != SOEnd; ++SO) { 2461 assert(SO->second.size() > 0 && 2462 "All virtual functions have overridding virtual functions"); 2463 if (SO->second.size() == 1) { 2464 // C++ [class.abstract]p4: 2465 // A class is abstract if it contains or inherits at least one 2466 // pure virtual function for which the final overrider is pure 2467 // virtual. 2468 if (SO->second.front().Method->isPure()) 2469 Record->setAbstract(true); 2470 continue; 2471 } 2472 2473 // C++ [class.virtual]p2: 2474 // In a derived class, if a virtual member function of a base 2475 // class subobject has more than one final overrider the 2476 // program is ill-formed. 2477 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2478 << (NamedDecl *)M->first << Record; 2479 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2480 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2481 OMEnd = SO->second.end(); 2482 OM != OMEnd; ++OM) 2483 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2484 << (NamedDecl *)M->first << OM->Method->getParent(); 2485 2486 Record->setInvalidDecl(); 2487 } 2488 } 2489 } 2490 2491 if (Record->isAbstract() && !Record->isInvalidDecl()) 2492 (void)AbstractClassUsageDiagnoser(*this, Record); 2493 2494 // If this is not an aggregate type and has no user-declared constructor, 2495 // complain about any non-static data members of reference or const scalar 2496 // type, since they will never get initializers. 2497 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2498 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2499 bool Complained = false; 2500 for (RecordDecl::field_iterator F = Record->field_begin(), 2501 FEnd = Record->field_end(); 2502 F != FEnd; ++F) { 2503 if (F->getType()->isReferenceType() || 2504 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2505 if (!Complained) { 2506 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2507 << Record->getTagKind() << Record; 2508 Complained = true; 2509 } 2510 2511 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2512 << F->getType()->isReferenceType() 2513 << F->getDeclName(); 2514 } 2515 } 2516 } 2517 2518 if (Record->isDynamicClass()) 2519 DynamicClasses.push_back(Record); 2520} 2521 2522void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2523 DeclPtrTy TagDecl, 2524 SourceLocation LBrac, 2525 SourceLocation RBrac, 2526 AttributeList *AttrList) { 2527 if (!TagDecl) 2528 return; 2529 2530 AdjustDeclIfTemplate(TagDecl); 2531 2532 ActOnFields(S, RLoc, TagDecl, 2533 (DeclPtrTy*)FieldCollector->getCurFields(), 2534 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2535 2536 CheckCompletedCXXClass(S, 2537 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2538} 2539 2540/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2541/// special functions, such as the default constructor, copy 2542/// constructor, or destructor, to the given C++ class (C++ 2543/// [special]p1). This routine can only be executed just before the 2544/// definition of the class is complete. 2545/// 2546/// The scope, if provided, is the class scope. 2547void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2548 CXXRecordDecl *ClassDecl) { 2549 CanQualType ClassType 2550 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2551 2552 // FIXME: Implicit declarations have exception specifications, which are 2553 // the union of the specifications of the implicitly called functions. 2554 2555 if (!ClassDecl->hasUserDeclaredConstructor()) { 2556 // C++ [class.ctor]p5: 2557 // A default constructor for a class X is a constructor of class X 2558 // that can be called without an argument. If there is no 2559 // user-declared constructor for class X, a default constructor is 2560 // implicitly declared. An implicitly-declared default constructor 2561 // is an inline public member of its class. 2562 DeclarationName Name 2563 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2564 CXXConstructorDecl *DefaultCon = 2565 CXXConstructorDecl::Create(Context, ClassDecl, 2566 ClassDecl->getLocation(), Name, 2567 Context.getFunctionType(Context.VoidTy, 2568 0, 0, false, 0, 2569 /*FIXME*/false, false, 2570 0, 0, 2571 FunctionType::ExtInfo()), 2572 /*TInfo=*/0, 2573 /*isExplicit=*/false, 2574 /*isInline=*/true, 2575 /*isImplicitlyDeclared=*/true); 2576 DefaultCon->setAccess(AS_public); 2577 DefaultCon->setImplicit(); 2578 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2579 if (S) 2580 PushOnScopeChains(DefaultCon, S, true); 2581 else 2582 ClassDecl->addDecl(DefaultCon); 2583 } 2584 2585 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2586 // C++ [class.copy]p4: 2587 // If the class definition does not explicitly declare a copy 2588 // constructor, one is declared implicitly. 2589 2590 // C++ [class.copy]p5: 2591 // The implicitly-declared copy constructor for a class X will 2592 // have the form 2593 // 2594 // X::X(const X&) 2595 // 2596 // if 2597 bool HasConstCopyConstructor = true; 2598 2599 // -- each direct or virtual base class B of X has a copy 2600 // constructor whose first parameter is of type const B& or 2601 // const volatile B&, and 2602 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2603 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2604 const CXXRecordDecl *BaseClassDecl 2605 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2606 HasConstCopyConstructor 2607 = BaseClassDecl->hasConstCopyConstructor(Context); 2608 } 2609 2610 // -- for all the nonstatic data members of X that are of a 2611 // class type M (or array thereof), each such class type 2612 // has a copy constructor whose first parameter is of type 2613 // const M& or const volatile M&. 2614 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2615 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2616 ++Field) { 2617 QualType FieldType = (*Field)->getType(); 2618 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2619 FieldType = Array->getElementType(); 2620 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2621 const CXXRecordDecl *FieldClassDecl 2622 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2623 HasConstCopyConstructor 2624 = FieldClassDecl->hasConstCopyConstructor(Context); 2625 } 2626 } 2627 2628 // Otherwise, the implicitly declared copy constructor will have 2629 // the form 2630 // 2631 // X::X(X&) 2632 QualType ArgType = ClassType; 2633 if (HasConstCopyConstructor) 2634 ArgType = ArgType.withConst(); 2635 ArgType = Context.getLValueReferenceType(ArgType); 2636 2637 // An implicitly-declared copy constructor is an inline public 2638 // member of its class. 2639 DeclarationName Name 2640 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2641 CXXConstructorDecl *CopyConstructor 2642 = CXXConstructorDecl::Create(Context, ClassDecl, 2643 ClassDecl->getLocation(), Name, 2644 Context.getFunctionType(Context.VoidTy, 2645 &ArgType, 1, 2646 false, 0, 2647 /*FIXME: hasExceptionSpec*/false, 2648 false, 0, 0, 2649 FunctionType::ExtInfo()), 2650 /*TInfo=*/0, 2651 /*isExplicit=*/false, 2652 /*isInline=*/true, 2653 /*isImplicitlyDeclared=*/true); 2654 CopyConstructor->setAccess(AS_public); 2655 CopyConstructor->setImplicit(); 2656 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2657 2658 // Add the parameter to the constructor. 2659 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2660 ClassDecl->getLocation(), 2661 /*IdentifierInfo=*/0, 2662 ArgType, /*TInfo=*/0, 2663 VarDecl::None, 2664 VarDecl::None, 0); 2665 CopyConstructor->setParams(&FromParam, 1); 2666 if (S) 2667 PushOnScopeChains(CopyConstructor, S, true); 2668 else 2669 ClassDecl->addDecl(CopyConstructor); 2670 } 2671 2672 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2673 // Note: The following rules are largely analoguous to the copy 2674 // constructor rules. Note that virtual bases are not taken into account 2675 // for determining the argument type of the operator. Note also that 2676 // operators taking an object instead of a reference are allowed. 2677 // 2678 // C++ [class.copy]p10: 2679 // If the class definition does not explicitly declare a copy 2680 // assignment operator, one is declared implicitly. 2681 // The implicitly-defined copy assignment operator for a class X 2682 // will have the form 2683 // 2684 // X& X::operator=(const X&) 2685 // 2686 // if 2687 bool HasConstCopyAssignment = true; 2688 2689 // -- each direct base class B of X has a copy assignment operator 2690 // whose parameter is of type const B&, const volatile B& or B, 2691 // and 2692 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2693 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2694 assert(!Base->getType()->isDependentType() && 2695 "Cannot generate implicit members for class with dependent bases."); 2696 const CXXRecordDecl *BaseClassDecl 2697 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2698 const CXXMethodDecl *MD = 0; 2699 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2700 MD); 2701 } 2702 2703 // -- for all the nonstatic data members of X that are of a class 2704 // type M (or array thereof), each such class type has a copy 2705 // assignment operator whose parameter is of type const M&, 2706 // const volatile M& or M. 2707 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2708 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2709 ++Field) { 2710 QualType FieldType = (*Field)->getType(); 2711 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2712 FieldType = Array->getElementType(); 2713 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2714 const CXXRecordDecl *FieldClassDecl 2715 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2716 const CXXMethodDecl *MD = 0; 2717 HasConstCopyAssignment 2718 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2719 } 2720 } 2721 2722 // Otherwise, the implicitly declared copy assignment operator will 2723 // have the form 2724 // 2725 // X& X::operator=(X&) 2726 QualType ArgType = ClassType; 2727 QualType RetType = Context.getLValueReferenceType(ArgType); 2728 if (HasConstCopyAssignment) 2729 ArgType = ArgType.withConst(); 2730 ArgType = Context.getLValueReferenceType(ArgType); 2731 2732 // An implicitly-declared copy assignment operator is an inline public 2733 // member of its class. 2734 DeclarationName Name = 2735 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2736 CXXMethodDecl *CopyAssignment = 2737 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2738 Context.getFunctionType(RetType, &ArgType, 1, 2739 false, 0, 2740 /*FIXME: hasExceptionSpec*/false, 2741 false, 0, 0, 2742 FunctionType::ExtInfo()), 2743 /*TInfo=*/0, /*isStatic=*/false, 2744 /*StorageClassAsWritten=*/FunctionDecl::None, 2745 /*isInline=*/true); 2746 CopyAssignment->setAccess(AS_public); 2747 CopyAssignment->setImplicit(); 2748 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2749 CopyAssignment->setCopyAssignment(true); 2750 2751 // Add the parameter to the operator. 2752 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2753 ClassDecl->getLocation(), 2754 /*Id=*/0, 2755 ArgType, /*TInfo=*/0, 2756 VarDecl::None, 2757 VarDecl::None, 0); 2758 CopyAssignment->setParams(&FromParam, 1); 2759 2760 // Don't call addedAssignmentOperator. There is no way to distinguish an 2761 // implicit from an explicit assignment operator. 2762 if (S) 2763 PushOnScopeChains(CopyAssignment, S, true); 2764 else 2765 ClassDecl->addDecl(CopyAssignment); 2766 AddOverriddenMethods(ClassDecl, CopyAssignment); 2767 } 2768 2769 if (!ClassDecl->hasUserDeclaredDestructor()) { 2770 // C++ [class.dtor]p2: 2771 // If a class has no user-declared destructor, a destructor is 2772 // declared implicitly. An implicitly-declared destructor is an 2773 // inline public member of its class. 2774 QualType Ty = Context.getFunctionType(Context.VoidTy, 2775 0, 0, false, 0, 2776 /*FIXME: hasExceptionSpec*/false, 2777 false, 0, 0, FunctionType::ExtInfo()); 2778 2779 DeclarationName Name 2780 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2781 CXXDestructorDecl *Destructor 2782 = CXXDestructorDecl::Create(Context, ClassDecl, 2783 ClassDecl->getLocation(), Name, Ty, 2784 /*isInline=*/true, 2785 /*isImplicitlyDeclared=*/true); 2786 Destructor->setAccess(AS_public); 2787 Destructor->setImplicit(); 2788 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2789 if (S) 2790 PushOnScopeChains(Destructor, S, true); 2791 else 2792 ClassDecl->addDecl(Destructor); 2793 2794 // This could be uniqued if it ever proves significant. 2795 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2796 2797 AddOverriddenMethods(ClassDecl, Destructor); 2798 } 2799} 2800 2801void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2802 Decl *D = TemplateD.getAs<Decl>(); 2803 if (!D) 2804 return; 2805 2806 TemplateParameterList *Params = 0; 2807 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2808 Params = Template->getTemplateParameters(); 2809 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2810 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2811 Params = PartialSpec->getTemplateParameters(); 2812 else 2813 return; 2814 2815 for (TemplateParameterList::iterator Param = Params->begin(), 2816 ParamEnd = Params->end(); 2817 Param != ParamEnd; ++Param) { 2818 NamedDecl *Named = cast<NamedDecl>(*Param); 2819 if (Named->getDeclName()) { 2820 S->AddDecl(DeclPtrTy::make(Named)); 2821 IdResolver.AddDecl(Named); 2822 } 2823 } 2824} 2825 2826void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2827 if (!RecordD) return; 2828 AdjustDeclIfTemplate(RecordD); 2829 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2830 PushDeclContext(S, Record); 2831} 2832 2833void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2834 if (!RecordD) return; 2835 PopDeclContext(); 2836} 2837 2838/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2839/// parsing a top-level (non-nested) C++ class, and we are now 2840/// parsing those parts of the given Method declaration that could 2841/// not be parsed earlier (C++ [class.mem]p2), such as default 2842/// arguments. This action should enter the scope of the given 2843/// Method declaration as if we had just parsed the qualified method 2844/// name. However, it should not bring the parameters into scope; 2845/// that will be performed by ActOnDelayedCXXMethodParameter. 2846void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2847} 2848 2849/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2850/// C++ method declaration. We're (re-)introducing the given 2851/// function parameter into scope for use in parsing later parts of 2852/// the method declaration. For example, we could see an 2853/// ActOnParamDefaultArgument event for this parameter. 2854void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2855 if (!ParamD) 2856 return; 2857 2858 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2859 2860 // If this parameter has an unparsed default argument, clear it out 2861 // to make way for the parsed default argument. 2862 if (Param->hasUnparsedDefaultArg()) 2863 Param->setDefaultArg(0); 2864 2865 S->AddDecl(DeclPtrTy::make(Param)); 2866 if (Param->getDeclName()) 2867 IdResolver.AddDecl(Param); 2868} 2869 2870/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2871/// processing the delayed method declaration for Method. The method 2872/// declaration is now considered finished. There may be a separate 2873/// ActOnStartOfFunctionDef action later (not necessarily 2874/// immediately!) for this method, if it was also defined inside the 2875/// class body. 2876void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2877 if (!MethodD) 2878 return; 2879 2880 AdjustDeclIfTemplate(MethodD); 2881 2882 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2883 2884 // Now that we have our default arguments, check the constructor 2885 // again. It could produce additional diagnostics or affect whether 2886 // the class has implicitly-declared destructors, among other 2887 // things. 2888 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2889 CheckConstructor(Constructor); 2890 2891 // Check the default arguments, which we may have added. 2892 if (!Method->isInvalidDecl()) 2893 CheckCXXDefaultArguments(Method); 2894} 2895 2896/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2897/// the well-formedness of the constructor declarator @p D with type @p 2898/// R. If there are any errors in the declarator, this routine will 2899/// emit diagnostics and set the invalid bit to true. In any case, the type 2900/// will be updated to reflect a well-formed type for the constructor and 2901/// returned. 2902QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2903 FunctionDecl::StorageClass &SC) { 2904 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2905 2906 // C++ [class.ctor]p3: 2907 // A constructor shall not be virtual (10.3) or static (9.4). A 2908 // constructor can be invoked for a const, volatile or const 2909 // volatile object. A constructor shall not be declared const, 2910 // volatile, or const volatile (9.3.2). 2911 if (isVirtual) { 2912 if (!D.isInvalidType()) 2913 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2914 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2915 << SourceRange(D.getIdentifierLoc()); 2916 D.setInvalidType(); 2917 } 2918 if (SC == FunctionDecl::Static) { 2919 if (!D.isInvalidType()) 2920 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2921 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2922 << SourceRange(D.getIdentifierLoc()); 2923 D.setInvalidType(); 2924 SC = FunctionDecl::None; 2925 } 2926 2927 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2928 if (FTI.TypeQuals != 0) { 2929 if (FTI.TypeQuals & Qualifiers::Const) 2930 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2931 << "const" << SourceRange(D.getIdentifierLoc()); 2932 if (FTI.TypeQuals & Qualifiers::Volatile) 2933 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2934 << "volatile" << SourceRange(D.getIdentifierLoc()); 2935 if (FTI.TypeQuals & Qualifiers::Restrict) 2936 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2937 << "restrict" << SourceRange(D.getIdentifierLoc()); 2938 } 2939 2940 // Rebuild the function type "R" without any type qualifiers (in 2941 // case any of the errors above fired) and with "void" as the 2942 // return type, since constructors don't have return types. We 2943 // *always* have to do this, because GetTypeForDeclarator will 2944 // put in a result type of "int" when none was specified. 2945 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2946 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2947 Proto->getNumArgs(), 2948 Proto->isVariadic(), 0, 2949 Proto->hasExceptionSpec(), 2950 Proto->hasAnyExceptionSpec(), 2951 Proto->getNumExceptions(), 2952 Proto->exception_begin(), 2953 Proto->getExtInfo()); 2954} 2955 2956/// CheckConstructor - Checks a fully-formed constructor for 2957/// well-formedness, issuing any diagnostics required. Returns true if 2958/// the constructor declarator is invalid. 2959void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2960 CXXRecordDecl *ClassDecl 2961 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2962 if (!ClassDecl) 2963 return Constructor->setInvalidDecl(); 2964 2965 // C++ [class.copy]p3: 2966 // A declaration of a constructor for a class X is ill-formed if 2967 // its first parameter is of type (optionally cv-qualified) X and 2968 // either there are no other parameters or else all other 2969 // parameters have default arguments. 2970 if (!Constructor->isInvalidDecl() && 2971 ((Constructor->getNumParams() == 1) || 2972 (Constructor->getNumParams() > 1 && 2973 Constructor->getParamDecl(1)->hasDefaultArg())) && 2974 Constructor->getTemplateSpecializationKind() 2975 != TSK_ImplicitInstantiation) { 2976 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2977 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2978 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2979 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2980 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2981 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2982 2983 // FIXME: Rather that making the constructor invalid, we should endeavor 2984 // to fix the type. 2985 Constructor->setInvalidDecl(); 2986 } 2987 } 2988 2989 // Notify the class that we've added a constructor. In principle we 2990 // don't need to do this for out-of-line declarations; in practice 2991 // we only instantiate the most recent declaration of a method, so 2992 // we have to call this for everything but friends. 2993 if (!Constructor->getFriendObjectKind()) 2994 ClassDecl->addedConstructor(Context, Constructor); 2995} 2996 2997/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2998/// issuing any diagnostics required. Returns true on error. 2999bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3000 CXXRecordDecl *RD = Destructor->getParent(); 3001 3002 if (Destructor->isVirtual()) { 3003 SourceLocation Loc; 3004 3005 if (!Destructor->isImplicit()) 3006 Loc = Destructor->getLocation(); 3007 else 3008 Loc = RD->getLocation(); 3009 3010 // If we have a virtual destructor, look up the deallocation function 3011 FunctionDecl *OperatorDelete = 0; 3012 DeclarationName Name = 3013 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3014 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3015 return true; 3016 3017 Destructor->setOperatorDelete(OperatorDelete); 3018 } 3019 3020 return false; 3021} 3022 3023static inline bool 3024FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3025 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3026 FTI.ArgInfo[0].Param && 3027 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 3028} 3029 3030/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3031/// the well-formednes of the destructor declarator @p D with type @p 3032/// R. If there are any errors in the declarator, this routine will 3033/// emit diagnostics and set the declarator to invalid. Even if this happens, 3034/// will be updated to reflect a well-formed type for the destructor and 3035/// returned. 3036QualType Sema::CheckDestructorDeclarator(Declarator &D, 3037 FunctionDecl::StorageClass& SC) { 3038 // C++ [class.dtor]p1: 3039 // [...] A typedef-name that names a class is a class-name 3040 // (7.1.3); however, a typedef-name that names a class shall not 3041 // be used as the identifier in the declarator for a destructor 3042 // declaration. 3043 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3044 if (isa<TypedefType>(DeclaratorType)) { 3045 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3046 << DeclaratorType; 3047 D.setInvalidType(); 3048 } 3049 3050 // C++ [class.dtor]p2: 3051 // A destructor is used to destroy objects of its class type. A 3052 // destructor takes no parameters, and no return type can be 3053 // specified for it (not even void). The address of a destructor 3054 // shall not be taken. A destructor shall not be static. A 3055 // destructor can be invoked for a const, volatile or const 3056 // volatile object. A destructor shall not be declared const, 3057 // volatile or const volatile (9.3.2). 3058 if (SC == FunctionDecl::Static) { 3059 if (!D.isInvalidType()) 3060 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3061 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3062 << SourceRange(D.getIdentifierLoc()); 3063 SC = FunctionDecl::None; 3064 D.setInvalidType(); 3065 } 3066 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3067 // Destructors don't have return types, but the parser will 3068 // happily parse something like: 3069 // 3070 // class X { 3071 // float ~X(); 3072 // }; 3073 // 3074 // The return type will be eliminated later. 3075 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3076 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3077 << SourceRange(D.getIdentifierLoc()); 3078 } 3079 3080 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3081 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3082 if (FTI.TypeQuals & Qualifiers::Const) 3083 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3084 << "const" << SourceRange(D.getIdentifierLoc()); 3085 if (FTI.TypeQuals & Qualifiers::Volatile) 3086 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3087 << "volatile" << SourceRange(D.getIdentifierLoc()); 3088 if (FTI.TypeQuals & Qualifiers::Restrict) 3089 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3090 << "restrict" << SourceRange(D.getIdentifierLoc()); 3091 D.setInvalidType(); 3092 } 3093 3094 // Make sure we don't have any parameters. 3095 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3096 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3097 3098 // Delete the parameters. 3099 FTI.freeArgs(); 3100 D.setInvalidType(); 3101 } 3102 3103 // Make sure the destructor isn't variadic. 3104 if (FTI.isVariadic) { 3105 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3106 D.setInvalidType(); 3107 } 3108 3109 // Rebuild the function type "R" without any type qualifiers or 3110 // parameters (in case any of the errors above fired) and with 3111 // "void" as the return type, since destructors don't have return 3112 // types. We *always* have to do this, because GetTypeForDeclarator 3113 // will put in a result type of "int" when none was specified. 3114 // FIXME: Exceptions! 3115 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3116 false, false, 0, 0, FunctionType::ExtInfo()); 3117} 3118 3119/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3120/// well-formednes of the conversion function declarator @p D with 3121/// type @p R. If there are any errors in the declarator, this routine 3122/// will emit diagnostics and return true. Otherwise, it will return 3123/// false. Either way, the type @p R will be updated to reflect a 3124/// well-formed type for the conversion operator. 3125void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3126 FunctionDecl::StorageClass& SC) { 3127 // C++ [class.conv.fct]p1: 3128 // Neither parameter types nor return type can be specified. The 3129 // type of a conversion function (8.3.5) is "function taking no 3130 // parameter returning conversion-type-id." 3131 if (SC == FunctionDecl::Static) { 3132 if (!D.isInvalidType()) 3133 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3134 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3135 << SourceRange(D.getIdentifierLoc()); 3136 D.setInvalidType(); 3137 SC = FunctionDecl::None; 3138 } 3139 3140 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3141 3142 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3143 // Conversion functions don't have return types, but the parser will 3144 // happily parse something like: 3145 // 3146 // class X { 3147 // float operator bool(); 3148 // }; 3149 // 3150 // The return type will be changed later anyway. 3151 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3152 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3153 << SourceRange(D.getIdentifierLoc()); 3154 D.setInvalidType(); 3155 } 3156 3157 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3158 3159 // Make sure we don't have any parameters. 3160 if (Proto->getNumArgs() > 0) { 3161 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3162 3163 // Delete the parameters. 3164 D.getTypeObject(0).Fun.freeArgs(); 3165 D.setInvalidType(); 3166 } else if (Proto->isVariadic()) { 3167 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3168 D.setInvalidType(); 3169 } 3170 3171 // Diagnose "&operator bool()" and other such nonsense. This 3172 // is actually a gcc extension which we don't support. 3173 if (Proto->getResultType() != ConvType) { 3174 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3175 << Proto->getResultType(); 3176 D.setInvalidType(); 3177 ConvType = Proto->getResultType(); 3178 } 3179 3180 // C++ [class.conv.fct]p4: 3181 // The conversion-type-id shall not represent a function type nor 3182 // an array type. 3183 if (ConvType->isArrayType()) { 3184 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3185 ConvType = Context.getPointerType(ConvType); 3186 D.setInvalidType(); 3187 } else if (ConvType->isFunctionType()) { 3188 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3189 ConvType = Context.getPointerType(ConvType); 3190 D.setInvalidType(); 3191 } 3192 3193 // Rebuild the function type "R" without any parameters (in case any 3194 // of the errors above fired) and with the conversion type as the 3195 // return type. 3196 if (D.isInvalidType()) { 3197 R = Context.getFunctionType(ConvType, 0, 0, false, 3198 Proto->getTypeQuals(), 3199 Proto->hasExceptionSpec(), 3200 Proto->hasAnyExceptionSpec(), 3201 Proto->getNumExceptions(), 3202 Proto->exception_begin(), 3203 Proto->getExtInfo()); 3204 } 3205 3206 // C++0x explicit conversion operators. 3207 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3208 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3209 diag::warn_explicit_conversion_functions) 3210 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3211} 3212 3213/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3214/// the declaration of the given C++ conversion function. This routine 3215/// is responsible for recording the conversion function in the C++ 3216/// class, if possible. 3217Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3218 assert(Conversion && "Expected to receive a conversion function declaration"); 3219 3220 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3221 3222 // Make sure we aren't redeclaring the conversion function. 3223 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3224 3225 // C++ [class.conv.fct]p1: 3226 // [...] A conversion function is never used to convert a 3227 // (possibly cv-qualified) object to the (possibly cv-qualified) 3228 // same object type (or a reference to it), to a (possibly 3229 // cv-qualified) base class of that type (or a reference to it), 3230 // or to (possibly cv-qualified) void. 3231 // FIXME: Suppress this warning if the conversion function ends up being a 3232 // virtual function that overrides a virtual function in a base class. 3233 QualType ClassType 3234 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3235 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3236 ConvType = ConvTypeRef->getPointeeType(); 3237 if (ConvType->isRecordType()) { 3238 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3239 if (ConvType == ClassType) 3240 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3241 << ClassType; 3242 else if (IsDerivedFrom(ClassType, ConvType)) 3243 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3244 << ClassType << ConvType; 3245 } else if (ConvType->isVoidType()) { 3246 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3247 << ClassType << ConvType; 3248 } 3249 3250 if (Conversion->getPrimaryTemplate()) { 3251 // ignore specializations 3252 } else if (Conversion->getPreviousDeclaration()) { 3253 if (FunctionTemplateDecl *ConversionTemplate 3254 = Conversion->getDescribedFunctionTemplate()) { 3255 if (ClassDecl->replaceConversion( 3256 ConversionTemplate->getPreviousDeclaration(), 3257 ConversionTemplate)) 3258 return DeclPtrTy::make(ConversionTemplate); 3259 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3260 Conversion)) 3261 return DeclPtrTy::make(Conversion); 3262 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3263 } else if (FunctionTemplateDecl *ConversionTemplate 3264 = Conversion->getDescribedFunctionTemplate()) 3265 ClassDecl->addConversionFunction(ConversionTemplate); 3266 else 3267 ClassDecl->addConversionFunction(Conversion); 3268 3269 return DeclPtrTy::make(Conversion); 3270} 3271 3272//===----------------------------------------------------------------------===// 3273// Namespace Handling 3274//===----------------------------------------------------------------------===// 3275 3276/// ActOnStartNamespaceDef - This is called at the start of a namespace 3277/// definition. 3278Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3279 SourceLocation IdentLoc, 3280 IdentifierInfo *II, 3281 SourceLocation LBrace, 3282 AttributeList *AttrList) { 3283 NamespaceDecl *Namespc = 3284 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3285 Namespc->setLBracLoc(LBrace); 3286 3287 Scope *DeclRegionScope = NamespcScope->getParent(); 3288 3289 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3290 3291 if (II) { 3292 // C++ [namespace.def]p2: 3293 // The identifier in an original-namespace-definition shall not have been 3294 // previously defined in the declarative region in which the 3295 // original-namespace-definition appears. The identifier in an 3296 // original-namespace-definition is the name of the namespace. Subsequently 3297 // in that declarative region, it is treated as an original-namespace-name. 3298 3299 NamedDecl *PrevDecl 3300 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3301 ForRedeclaration); 3302 3303 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3304 // This is an extended namespace definition. 3305 // Attach this namespace decl to the chain of extended namespace 3306 // definitions. 3307 OrigNS->setNextNamespace(Namespc); 3308 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3309 3310 // Remove the previous declaration from the scope. 3311 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3312 IdResolver.RemoveDecl(OrigNS); 3313 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3314 } 3315 } else if (PrevDecl) { 3316 // This is an invalid name redefinition. 3317 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3318 << Namespc->getDeclName(); 3319 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3320 Namespc->setInvalidDecl(); 3321 // Continue on to push Namespc as current DeclContext and return it. 3322 } else if (II->isStr("std") && 3323 CurContext->getLookupContext()->isTranslationUnit()) { 3324 // This is the first "real" definition of the namespace "std", so update 3325 // our cache of the "std" namespace to point at this definition. 3326 if (StdNamespace) { 3327 // We had already defined a dummy namespace "std". Link this new 3328 // namespace definition to the dummy namespace "std". 3329 StdNamespace->setNextNamespace(Namespc); 3330 StdNamespace->setLocation(IdentLoc); 3331 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3332 } 3333 3334 // Make our StdNamespace cache point at the first real definition of the 3335 // "std" namespace. 3336 StdNamespace = Namespc; 3337 } 3338 3339 PushOnScopeChains(Namespc, DeclRegionScope); 3340 } else { 3341 // Anonymous namespaces. 3342 assert(Namespc->isAnonymousNamespace()); 3343 3344 // Link the anonymous namespace into its parent. 3345 NamespaceDecl *PrevDecl; 3346 DeclContext *Parent = CurContext->getLookupContext(); 3347 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3348 PrevDecl = TU->getAnonymousNamespace(); 3349 TU->setAnonymousNamespace(Namespc); 3350 } else { 3351 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3352 PrevDecl = ND->getAnonymousNamespace(); 3353 ND->setAnonymousNamespace(Namespc); 3354 } 3355 3356 // Link the anonymous namespace with its previous declaration. 3357 if (PrevDecl) { 3358 assert(PrevDecl->isAnonymousNamespace()); 3359 assert(!PrevDecl->getNextNamespace()); 3360 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3361 PrevDecl->setNextNamespace(Namespc); 3362 } 3363 3364 CurContext->addDecl(Namespc); 3365 3366 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3367 // behaves as if it were replaced by 3368 // namespace unique { /* empty body */ } 3369 // using namespace unique; 3370 // namespace unique { namespace-body } 3371 // where all occurrences of 'unique' in a translation unit are 3372 // replaced by the same identifier and this identifier differs 3373 // from all other identifiers in the entire program. 3374 3375 // We just create the namespace with an empty name and then add an 3376 // implicit using declaration, just like the standard suggests. 3377 // 3378 // CodeGen enforces the "universally unique" aspect by giving all 3379 // declarations semantically contained within an anonymous 3380 // namespace internal linkage. 3381 3382 if (!PrevDecl) { 3383 UsingDirectiveDecl* UD 3384 = UsingDirectiveDecl::Create(Context, CurContext, 3385 /* 'using' */ LBrace, 3386 /* 'namespace' */ SourceLocation(), 3387 /* qualifier */ SourceRange(), 3388 /* NNS */ NULL, 3389 /* identifier */ SourceLocation(), 3390 Namespc, 3391 /* Ancestor */ CurContext); 3392 UD->setImplicit(); 3393 CurContext->addDecl(UD); 3394 } 3395 } 3396 3397 // Although we could have an invalid decl (i.e. the namespace name is a 3398 // redefinition), push it as current DeclContext and try to continue parsing. 3399 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3400 // for the namespace has the declarations that showed up in that particular 3401 // namespace definition. 3402 PushDeclContext(NamespcScope, Namespc); 3403 return DeclPtrTy::make(Namespc); 3404} 3405 3406/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3407/// is a namespace alias, returns the namespace it points to. 3408static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3409 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3410 return AD->getNamespace(); 3411 return dyn_cast_or_null<NamespaceDecl>(D); 3412} 3413 3414/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3415/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3416void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3417 Decl *Dcl = D.getAs<Decl>(); 3418 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3419 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3420 Namespc->setRBracLoc(RBrace); 3421 PopDeclContext(); 3422} 3423 3424Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3425 SourceLocation UsingLoc, 3426 SourceLocation NamespcLoc, 3427 CXXScopeSpec &SS, 3428 SourceLocation IdentLoc, 3429 IdentifierInfo *NamespcName, 3430 AttributeList *AttrList) { 3431 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3432 assert(NamespcName && "Invalid NamespcName."); 3433 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3434 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3435 3436 UsingDirectiveDecl *UDir = 0; 3437 3438 // Lookup namespace name. 3439 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3440 LookupParsedName(R, S, &SS); 3441 if (R.isAmbiguous()) 3442 return DeclPtrTy(); 3443 3444 if (!R.empty()) { 3445 NamedDecl *Named = R.getFoundDecl(); 3446 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3447 && "expected namespace decl"); 3448 // C++ [namespace.udir]p1: 3449 // A using-directive specifies that the names in the nominated 3450 // namespace can be used in the scope in which the 3451 // using-directive appears after the using-directive. During 3452 // unqualified name lookup (3.4.1), the names appear as if they 3453 // were declared in the nearest enclosing namespace which 3454 // contains both the using-directive and the nominated 3455 // namespace. [Note: in this context, "contains" means "contains 3456 // directly or indirectly". ] 3457 3458 // Find enclosing context containing both using-directive and 3459 // nominated namespace. 3460 NamespaceDecl *NS = getNamespaceDecl(Named); 3461 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3462 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3463 CommonAncestor = CommonAncestor->getParent(); 3464 3465 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3466 SS.getRange(), 3467 (NestedNameSpecifier *)SS.getScopeRep(), 3468 IdentLoc, Named, CommonAncestor); 3469 PushUsingDirective(S, UDir); 3470 } else { 3471 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3472 } 3473 3474 // FIXME: We ignore attributes for now. 3475 delete AttrList; 3476 return DeclPtrTy::make(UDir); 3477} 3478 3479void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3480 // If scope has associated entity, then using directive is at namespace 3481 // or translation unit scope. We add UsingDirectiveDecls, into 3482 // it's lookup structure. 3483 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3484 Ctx->addDecl(UDir); 3485 else 3486 // Otherwise it is block-sope. using-directives will affect lookup 3487 // only to the end of scope. 3488 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3489} 3490 3491 3492Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3493 AccessSpecifier AS, 3494 bool HasUsingKeyword, 3495 SourceLocation UsingLoc, 3496 CXXScopeSpec &SS, 3497 UnqualifiedId &Name, 3498 AttributeList *AttrList, 3499 bool IsTypeName, 3500 SourceLocation TypenameLoc) { 3501 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3502 3503 switch (Name.getKind()) { 3504 case UnqualifiedId::IK_Identifier: 3505 case UnqualifiedId::IK_OperatorFunctionId: 3506 case UnqualifiedId::IK_LiteralOperatorId: 3507 case UnqualifiedId::IK_ConversionFunctionId: 3508 break; 3509 3510 case UnqualifiedId::IK_ConstructorName: 3511 case UnqualifiedId::IK_ConstructorTemplateId: 3512 // C++0x inherited constructors. 3513 if (getLangOptions().CPlusPlus0x) break; 3514 3515 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3516 << SS.getRange(); 3517 return DeclPtrTy(); 3518 3519 case UnqualifiedId::IK_DestructorName: 3520 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3521 << SS.getRange(); 3522 return DeclPtrTy(); 3523 3524 case UnqualifiedId::IK_TemplateId: 3525 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3526 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3527 return DeclPtrTy(); 3528 } 3529 3530 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3531 if (!TargetName) 3532 return DeclPtrTy(); 3533 3534 // Warn about using declarations. 3535 // TODO: store that the declaration was written without 'using' and 3536 // talk about access decls instead of using decls in the 3537 // diagnostics. 3538 if (!HasUsingKeyword) { 3539 UsingLoc = Name.getSourceRange().getBegin(); 3540 3541 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3542 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3543 } 3544 3545 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3546 Name.getSourceRange().getBegin(), 3547 TargetName, AttrList, 3548 /* IsInstantiation */ false, 3549 IsTypeName, TypenameLoc); 3550 if (UD) 3551 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3552 3553 return DeclPtrTy::make(UD); 3554} 3555 3556/// Determines whether to create a using shadow decl for a particular 3557/// decl, given the set of decls existing prior to this using lookup. 3558bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3559 const LookupResult &Previous) { 3560 // Diagnose finding a decl which is not from a base class of the 3561 // current class. We do this now because there are cases where this 3562 // function will silently decide not to build a shadow decl, which 3563 // will pre-empt further diagnostics. 3564 // 3565 // We don't need to do this in C++0x because we do the check once on 3566 // the qualifier. 3567 // 3568 // FIXME: diagnose the following if we care enough: 3569 // struct A { int foo; }; 3570 // struct B : A { using A::foo; }; 3571 // template <class T> struct C : A {}; 3572 // template <class T> struct D : C<T> { using B::foo; } // <--- 3573 // This is invalid (during instantiation) in C++03 because B::foo 3574 // resolves to the using decl in B, which is not a base class of D<T>. 3575 // We can't diagnose it immediately because C<T> is an unknown 3576 // specialization. The UsingShadowDecl in D<T> then points directly 3577 // to A::foo, which will look well-formed when we instantiate. 3578 // The right solution is to not collapse the shadow-decl chain. 3579 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3580 DeclContext *OrigDC = Orig->getDeclContext(); 3581 3582 // Handle enums and anonymous structs. 3583 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3584 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3585 while (OrigRec->isAnonymousStructOrUnion()) 3586 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3587 3588 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3589 if (OrigDC == CurContext) { 3590 Diag(Using->getLocation(), 3591 diag::err_using_decl_nested_name_specifier_is_current_class) 3592 << Using->getNestedNameRange(); 3593 Diag(Orig->getLocation(), diag::note_using_decl_target); 3594 return true; 3595 } 3596 3597 Diag(Using->getNestedNameRange().getBegin(), 3598 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3599 << Using->getTargetNestedNameDecl() 3600 << cast<CXXRecordDecl>(CurContext) 3601 << Using->getNestedNameRange(); 3602 Diag(Orig->getLocation(), diag::note_using_decl_target); 3603 return true; 3604 } 3605 } 3606 3607 if (Previous.empty()) return false; 3608 3609 NamedDecl *Target = Orig; 3610 if (isa<UsingShadowDecl>(Target)) 3611 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3612 3613 // If the target happens to be one of the previous declarations, we 3614 // don't have a conflict. 3615 // 3616 // FIXME: but we might be increasing its access, in which case we 3617 // should redeclare it. 3618 NamedDecl *NonTag = 0, *Tag = 0; 3619 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3620 I != E; ++I) { 3621 NamedDecl *D = (*I)->getUnderlyingDecl(); 3622 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3623 return false; 3624 3625 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3626 } 3627 3628 if (Target->isFunctionOrFunctionTemplate()) { 3629 FunctionDecl *FD; 3630 if (isa<FunctionTemplateDecl>(Target)) 3631 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3632 else 3633 FD = cast<FunctionDecl>(Target); 3634 3635 NamedDecl *OldDecl = 0; 3636 switch (CheckOverload(FD, Previous, OldDecl)) { 3637 case Ovl_Overload: 3638 return false; 3639 3640 case Ovl_NonFunction: 3641 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3642 break; 3643 3644 // We found a decl with the exact signature. 3645 case Ovl_Match: 3646 if (isa<UsingShadowDecl>(OldDecl)) { 3647 // Silently ignore the possible conflict. 3648 return false; 3649 } 3650 3651 // If we're in a record, we want to hide the target, so we 3652 // return true (without a diagnostic) to tell the caller not to 3653 // build a shadow decl. 3654 if (CurContext->isRecord()) 3655 return true; 3656 3657 // If we're not in a record, this is an error. 3658 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3659 break; 3660 } 3661 3662 Diag(Target->getLocation(), diag::note_using_decl_target); 3663 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3664 return true; 3665 } 3666 3667 // Target is not a function. 3668 3669 if (isa<TagDecl>(Target)) { 3670 // No conflict between a tag and a non-tag. 3671 if (!Tag) return false; 3672 3673 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3674 Diag(Target->getLocation(), diag::note_using_decl_target); 3675 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3676 return true; 3677 } 3678 3679 // No conflict between a tag and a non-tag. 3680 if (!NonTag) return false; 3681 3682 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3683 Diag(Target->getLocation(), diag::note_using_decl_target); 3684 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3685 return true; 3686} 3687 3688/// Builds a shadow declaration corresponding to a 'using' declaration. 3689UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3690 UsingDecl *UD, 3691 NamedDecl *Orig) { 3692 3693 // If we resolved to another shadow declaration, just coalesce them. 3694 NamedDecl *Target = Orig; 3695 if (isa<UsingShadowDecl>(Target)) { 3696 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3697 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3698 } 3699 3700 UsingShadowDecl *Shadow 3701 = UsingShadowDecl::Create(Context, CurContext, 3702 UD->getLocation(), UD, Target); 3703 UD->addShadowDecl(Shadow); 3704 3705 if (S) 3706 PushOnScopeChains(Shadow, S); 3707 else 3708 CurContext->addDecl(Shadow); 3709 Shadow->setAccess(UD->getAccess()); 3710 3711 // Register it as a conversion if appropriate. 3712 if (Shadow->getDeclName().getNameKind() 3713 == DeclarationName::CXXConversionFunctionName) 3714 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3715 3716 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3717 Shadow->setInvalidDecl(); 3718 3719 return Shadow; 3720} 3721 3722/// Hides a using shadow declaration. This is required by the current 3723/// using-decl implementation when a resolvable using declaration in a 3724/// class is followed by a declaration which would hide or override 3725/// one or more of the using decl's targets; for example: 3726/// 3727/// struct Base { void foo(int); }; 3728/// struct Derived : Base { 3729/// using Base::foo; 3730/// void foo(int); 3731/// }; 3732/// 3733/// The governing language is C++03 [namespace.udecl]p12: 3734/// 3735/// When a using-declaration brings names from a base class into a 3736/// derived class scope, member functions in the derived class 3737/// override and/or hide member functions with the same name and 3738/// parameter types in a base class (rather than conflicting). 3739/// 3740/// There are two ways to implement this: 3741/// (1) optimistically create shadow decls when they're not hidden 3742/// by existing declarations, or 3743/// (2) don't create any shadow decls (or at least don't make them 3744/// visible) until we've fully parsed/instantiated the class. 3745/// The problem with (1) is that we might have to retroactively remove 3746/// a shadow decl, which requires several O(n) operations because the 3747/// decl structures are (very reasonably) not designed for removal. 3748/// (2) avoids this but is very fiddly and phase-dependent. 3749void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3750 if (Shadow->getDeclName().getNameKind() == 3751 DeclarationName::CXXConversionFunctionName) 3752 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3753 3754 // Remove it from the DeclContext... 3755 Shadow->getDeclContext()->removeDecl(Shadow); 3756 3757 // ...and the scope, if applicable... 3758 if (S) { 3759 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3760 IdResolver.RemoveDecl(Shadow); 3761 } 3762 3763 // ...and the using decl. 3764 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3765 3766 // TODO: complain somehow if Shadow was used. It shouldn't 3767 // be possible for this to happen, because...? 3768} 3769 3770/// Builds a using declaration. 3771/// 3772/// \param IsInstantiation - Whether this call arises from an 3773/// instantiation of an unresolved using declaration. We treat 3774/// the lookup differently for these declarations. 3775NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3776 SourceLocation UsingLoc, 3777 CXXScopeSpec &SS, 3778 SourceLocation IdentLoc, 3779 DeclarationName Name, 3780 AttributeList *AttrList, 3781 bool IsInstantiation, 3782 bool IsTypeName, 3783 SourceLocation TypenameLoc) { 3784 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3785 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3786 3787 // FIXME: We ignore attributes for now. 3788 delete AttrList; 3789 3790 if (SS.isEmpty()) { 3791 Diag(IdentLoc, diag::err_using_requires_qualname); 3792 return 0; 3793 } 3794 3795 // Do the redeclaration lookup in the current scope. 3796 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3797 ForRedeclaration); 3798 Previous.setHideTags(false); 3799 if (S) { 3800 LookupName(Previous, S); 3801 3802 // It is really dumb that we have to do this. 3803 LookupResult::Filter F = Previous.makeFilter(); 3804 while (F.hasNext()) { 3805 NamedDecl *D = F.next(); 3806 if (!isDeclInScope(D, CurContext, S)) 3807 F.erase(); 3808 } 3809 F.done(); 3810 } else { 3811 assert(IsInstantiation && "no scope in non-instantiation"); 3812 assert(CurContext->isRecord() && "scope not record in instantiation"); 3813 LookupQualifiedName(Previous, CurContext); 3814 } 3815 3816 NestedNameSpecifier *NNS = 3817 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3818 3819 // Check for invalid redeclarations. 3820 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3821 return 0; 3822 3823 // Check for bad qualifiers. 3824 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3825 return 0; 3826 3827 DeclContext *LookupContext = computeDeclContext(SS); 3828 NamedDecl *D; 3829 if (!LookupContext) { 3830 if (IsTypeName) { 3831 // FIXME: not all declaration name kinds are legal here 3832 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3833 UsingLoc, TypenameLoc, 3834 SS.getRange(), NNS, 3835 IdentLoc, Name); 3836 } else { 3837 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3838 UsingLoc, SS.getRange(), NNS, 3839 IdentLoc, Name); 3840 } 3841 } else { 3842 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3843 SS.getRange(), UsingLoc, NNS, Name, 3844 IsTypeName); 3845 } 3846 D->setAccess(AS); 3847 CurContext->addDecl(D); 3848 3849 if (!LookupContext) return D; 3850 UsingDecl *UD = cast<UsingDecl>(D); 3851 3852 if (RequireCompleteDeclContext(SS, LookupContext)) { 3853 UD->setInvalidDecl(); 3854 return UD; 3855 } 3856 3857 // Look up the target name. 3858 3859 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3860 3861 // Unlike most lookups, we don't always want to hide tag 3862 // declarations: tag names are visible through the using declaration 3863 // even if hidden by ordinary names, *except* in a dependent context 3864 // where it's important for the sanity of two-phase lookup. 3865 if (!IsInstantiation) 3866 R.setHideTags(false); 3867 3868 LookupQualifiedName(R, LookupContext); 3869 3870 if (R.empty()) { 3871 Diag(IdentLoc, diag::err_no_member) 3872 << Name << LookupContext << SS.getRange(); 3873 UD->setInvalidDecl(); 3874 return UD; 3875 } 3876 3877 if (R.isAmbiguous()) { 3878 UD->setInvalidDecl(); 3879 return UD; 3880 } 3881 3882 if (IsTypeName) { 3883 // If we asked for a typename and got a non-type decl, error out. 3884 if (!R.getAsSingle<TypeDecl>()) { 3885 Diag(IdentLoc, diag::err_using_typename_non_type); 3886 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3887 Diag((*I)->getUnderlyingDecl()->getLocation(), 3888 diag::note_using_decl_target); 3889 UD->setInvalidDecl(); 3890 return UD; 3891 } 3892 } else { 3893 // If we asked for a non-typename and we got a type, error out, 3894 // but only if this is an instantiation of an unresolved using 3895 // decl. Otherwise just silently find the type name. 3896 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3897 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3898 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3899 UD->setInvalidDecl(); 3900 return UD; 3901 } 3902 } 3903 3904 // C++0x N2914 [namespace.udecl]p6: 3905 // A using-declaration shall not name a namespace. 3906 if (R.getAsSingle<NamespaceDecl>()) { 3907 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3908 << SS.getRange(); 3909 UD->setInvalidDecl(); 3910 return UD; 3911 } 3912 3913 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3914 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3915 BuildUsingShadowDecl(S, UD, *I); 3916 } 3917 3918 return UD; 3919} 3920 3921/// Checks that the given using declaration is not an invalid 3922/// redeclaration. Note that this is checking only for the using decl 3923/// itself, not for any ill-formedness among the UsingShadowDecls. 3924bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3925 bool isTypeName, 3926 const CXXScopeSpec &SS, 3927 SourceLocation NameLoc, 3928 const LookupResult &Prev) { 3929 // C++03 [namespace.udecl]p8: 3930 // C++0x [namespace.udecl]p10: 3931 // A using-declaration is a declaration and can therefore be used 3932 // repeatedly where (and only where) multiple declarations are 3933 // allowed. 3934 // 3935 // That's in non-member contexts. 3936 if (!CurContext->getLookupContext()->isRecord()) 3937 return false; 3938 3939 NestedNameSpecifier *Qual 3940 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3941 3942 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3943 NamedDecl *D = *I; 3944 3945 bool DTypename; 3946 NestedNameSpecifier *DQual; 3947 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3948 DTypename = UD->isTypeName(); 3949 DQual = UD->getTargetNestedNameDecl(); 3950 } else if (UnresolvedUsingValueDecl *UD 3951 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3952 DTypename = false; 3953 DQual = UD->getTargetNestedNameSpecifier(); 3954 } else if (UnresolvedUsingTypenameDecl *UD 3955 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3956 DTypename = true; 3957 DQual = UD->getTargetNestedNameSpecifier(); 3958 } else continue; 3959 3960 // using decls differ if one says 'typename' and the other doesn't. 3961 // FIXME: non-dependent using decls? 3962 if (isTypeName != DTypename) continue; 3963 3964 // using decls differ if they name different scopes (but note that 3965 // template instantiation can cause this check to trigger when it 3966 // didn't before instantiation). 3967 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3968 Context.getCanonicalNestedNameSpecifier(DQual)) 3969 continue; 3970 3971 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3972 Diag(D->getLocation(), diag::note_using_decl) << 1; 3973 return true; 3974 } 3975 3976 return false; 3977} 3978 3979 3980/// Checks that the given nested-name qualifier used in a using decl 3981/// in the current context is appropriately related to the current 3982/// scope. If an error is found, diagnoses it and returns true. 3983bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3984 const CXXScopeSpec &SS, 3985 SourceLocation NameLoc) { 3986 DeclContext *NamedContext = computeDeclContext(SS); 3987 3988 if (!CurContext->isRecord()) { 3989 // C++03 [namespace.udecl]p3: 3990 // C++0x [namespace.udecl]p8: 3991 // A using-declaration for a class member shall be a member-declaration. 3992 3993 // If we weren't able to compute a valid scope, it must be a 3994 // dependent class scope. 3995 if (!NamedContext || NamedContext->isRecord()) { 3996 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3997 << SS.getRange(); 3998 return true; 3999 } 4000 4001 // Otherwise, everything is known to be fine. 4002 return false; 4003 } 4004 4005 // The current scope is a record. 4006 4007 // If the named context is dependent, we can't decide much. 4008 if (!NamedContext) { 4009 // FIXME: in C++0x, we can diagnose if we can prove that the 4010 // nested-name-specifier does not refer to a base class, which is 4011 // still possible in some cases. 4012 4013 // Otherwise we have to conservatively report that things might be 4014 // okay. 4015 return false; 4016 } 4017 4018 if (!NamedContext->isRecord()) { 4019 // Ideally this would point at the last name in the specifier, 4020 // but we don't have that level of source info. 4021 Diag(SS.getRange().getBegin(), 4022 diag::err_using_decl_nested_name_specifier_is_not_class) 4023 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4024 return true; 4025 } 4026 4027 if (getLangOptions().CPlusPlus0x) { 4028 // C++0x [namespace.udecl]p3: 4029 // In a using-declaration used as a member-declaration, the 4030 // nested-name-specifier shall name a base class of the class 4031 // being defined. 4032 4033 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4034 cast<CXXRecordDecl>(NamedContext))) { 4035 if (CurContext == NamedContext) { 4036 Diag(NameLoc, 4037 diag::err_using_decl_nested_name_specifier_is_current_class) 4038 << SS.getRange(); 4039 return true; 4040 } 4041 4042 Diag(SS.getRange().getBegin(), 4043 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4044 << (NestedNameSpecifier*) SS.getScopeRep() 4045 << cast<CXXRecordDecl>(CurContext) 4046 << SS.getRange(); 4047 return true; 4048 } 4049 4050 return false; 4051 } 4052 4053 // C++03 [namespace.udecl]p4: 4054 // A using-declaration used as a member-declaration shall refer 4055 // to a member of a base class of the class being defined [etc.]. 4056 4057 // Salient point: SS doesn't have to name a base class as long as 4058 // lookup only finds members from base classes. Therefore we can 4059 // diagnose here only if we can prove that that can't happen, 4060 // i.e. if the class hierarchies provably don't intersect. 4061 4062 // TODO: it would be nice if "definitely valid" results were cached 4063 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4064 // need to be repeated. 4065 4066 struct UserData { 4067 llvm::DenseSet<const CXXRecordDecl*> Bases; 4068 4069 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4070 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4071 Data->Bases.insert(Base); 4072 return true; 4073 } 4074 4075 bool hasDependentBases(const CXXRecordDecl *Class) { 4076 return !Class->forallBases(collect, this); 4077 } 4078 4079 /// Returns true if the base is dependent or is one of the 4080 /// accumulated base classes. 4081 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4082 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4083 return !Data->Bases.count(Base); 4084 } 4085 4086 bool mightShareBases(const CXXRecordDecl *Class) { 4087 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4088 } 4089 }; 4090 4091 UserData Data; 4092 4093 // Returns false if we find a dependent base. 4094 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4095 return false; 4096 4097 // Returns false if the class has a dependent base or if it or one 4098 // of its bases is present in the base set of the current context. 4099 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4100 return false; 4101 4102 Diag(SS.getRange().getBegin(), 4103 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4104 << (NestedNameSpecifier*) SS.getScopeRep() 4105 << cast<CXXRecordDecl>(CurContext) 4106 << SS.getRange(); 4107 4108 return true; 4109} 4110 4111Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4112 SourceLocation NamespaceLoc, 4113 SourceLocation AliasLoc, 4114 IdentifierInfo *Alias, 4115 CXXScopeSpec &SS, 4116 SourceLocation IdentLoc, 4117 IdentifierInfo *Ident) { 4118 4119 // Lookup the namespace name. 4120 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4121 LookupParsedName(R, S, &SS); 4122 4123 // Check if we have a previous declaration with the same name. 4124 NamedDecl *PrevDecl 4125 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4126 ForRedeclaration); 4127 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4128 PrevDecl = 0; 4129 4130 if (PrevDecl) { 4131 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4132 // We already have an alias with the same name that points to the same 4133 // namespace, so don't create a new one. 4134 // FIXME: At some point, we'll want to create the (redundant) 4135 // declaration to maintain better source information. 4136 if (!R.isAmbiguous() && !R.empty() && 4137 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4138 return DeclPtrTy(); 4139 } 4140 4141 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4142 diag::err_redefinition_different_kind; 4143 Diag(AliasLoc, DiagID) << Alias; 4144 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4145 return DeclPtrTy(); 4146 } 4147 4148 if (R.isAmbiguous()) 4149 return DeclPtrTy(); 4150 4151 if (R.empty()) { 4152 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4153 return DeclPtrTy(); 4154 } 4155 4156 NamespaceAliasDecl *AliasDecl = 4157 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4158 Alias, SS.getRange(), 4159 (NestedNameSpecifier *)SS.getScopeRep(), 4160 IdentLoc, R.getFoundDecl()); 4161 4162 PushOnScopeChains(AliasDecl, S); 4163 return DeclPtrTy::make(AliasDecl); 4164} 4165 4166namespace { 4167 /// \brief Scoped object used to handle the state changes required in Sema 4168 /// to implicitly define the body of a C++ member function; 4169 class ImplicitlyDefinedFunctionScope { 4170 Sema &S; 4171 DeclContext *PreviousContext; 4172 4173 public: 4174 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4175 : S(S), PreviousContext(S.CurContext) 4176 { 4177 S.CurContext = Method; 4178 S.PushFunctionScope(); 4179 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4180 } 4181 4182 ~ImplicitlyDefinedFunctionScope() { 4183 S.PopExpressionEvaluationContext(); 4184 S.PopFunctionOrBlockScope(); 4185 S.CurContext = PreviousContext; 4186 } 4187 }; 4188} 4189 4190void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4191 CXXConstructorDecl *Constructor) { 4192 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4193 !Constructor->isUsed()) && 4194 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4195 4196 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4197 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4198 4199 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4200 ErrorTrap Trap(*this); 4201 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4202 Trap.hasErrorOccurred()) { 4203 Diag(CurrentLocation, diag::note_member_synthesized_at) 4204 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4205 Constructor->setInvalidDecl(); 4206 } else { 4207 Constructor->setUsed(); 4208 MarkVTableUsed(CurrentLocation, ClassDecl); 4209 } 4210} 4211 4212void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4213 CXXDestructorDecl *Destructor) { 4214 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4215 "DefineImplicitDestructor - call it for implicit default dtor"); 4216 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4217 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4218 4219 if (Destructor->isInvalidDecl()) 4220 return; 4221 4222 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4223 4224 ErrorTrap Trap(*this); 4225 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4226 Destructor->getParent()); 4227 4228 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4229 Diag(CurrentLocation, diag::note_member_synthesized_at) 4230 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4231 4232 Destructor->setInvalidDecl(); 4233 return; 4234 } 4235 4236 Destructor->setUsed(); 4237 MarkVTableUsed(CurrentLocation, ClassDecl); 4238} 4239 4240/// \brief Builds a statement that copies the given entity from \p From to 4241/// \c To. 4242/// 4243/// This routine is used to copy the members of a class with an 4244/// implicitly-declared copy assignment operator. When the entities being 4245/// copied are arrays, this routine builds for loops to copy them. 4246/// 4247/// \param S The Sema object used for type-checking. 4248/// 4249/// \param Loc The location where the implicit copy is being generated. 4250/// 4251/// \param T The type of the expressions being copied. Both expressions must 4252/// have this type. 4253/// 4254/// \param To The expression we are copying to. 4255/// 4256/// \param From The expression we are copying from. 4257/// 4258/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4259/// Otherwise, it's a non-static member subobject. 4260/// 4261/// \param Depth Internal parameter recording the depth of the recursion. 4262/// 4263/// \returns A statement or a loop that copies the expressions. 4264static Sema::OwningStmtResult 4265BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4266 Sema::OwningExprResult To, Sema::OwningExprResult From, 4267 bool CopyingBaseSubobject, unsigned Depth = 0) { 4268 typedef Sema::OwningStmtResult OwningStmtResult; 4269 typedef Sema::OwningExprResult OwningExprResult; 4270 4271 // C++0x [class.copy]p30: 4272 // Each subobject is assigned in the manner appropriate to its type: 4273 // 4274 // - if the subobject is of class type, the copy assignment operator 4275 // for the class is used (as if by explicit qualification; that is, 4276 // ignoring any possible virtual overriding functions in more derived 4277 // classes); 4278 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4279 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4280 4281 // Look for operator=. 4282 DeclarationName Name 4283 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4284 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4285 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4286 4287 // Filter out any result that isn't a copy-assignment operator. 4288 LookupResult::Filter F = OpLookup.makeFilter(); 4289 while (F.hasNext()) { 4290 NamedDecl *D = F.next(); 4291 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4292 if (Method->isCopyAssignmentOperator()) 4293 continue; 4294 4295 F.erase(); 4296 } 4297 F.done(); 4298 4299 // Suppress the protected check (C++ [class.protected]) for each of the 4300 // assignment operators we found. This strange dance is required when 4301 // we're assigning via a base classes's copy-assignment operator. To 4302 // ensure that we're getting the right base class subobject (without 4303 // ambiguities), we need to cast "this" to that subobject type; to 4304 // ensure that we don't go through the virtual call mechanism, we need 4305 // to qualify the operator= name with the base class (see below). However, 4306 // this means that if the base class has a protected copy assignment 4307 // operator, the protected member access check will fail. So, we 4308 // rewrite "protected" access to "public" access in this case, since we 4309 // know by construction that we're calling from a derived class. 4310 if (CopyingBaseSubobject) { 4311 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4312 L != LEnd; ++L) { 4313 if (L.getAccess() == AS_protected) 4314 L.setAccess(AS_public); 4315 } 4316 } 4317 4318 // Create the nested-name-specifier that will be used to qualify the 4319 // reference to operator=; this is required to suppress the virtual 4320 // call mechanism. 4321 CXXScopeSpec SS; 4322 SS.setRange(Loc); 4323 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4324 T.getTypePtr())); 4325 4326 // Create the reference to operator=. 4327 OwningExprResult OpEqualRef 4328 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4329 /*FirstQualifierInScope=*/0, OpLookup, 4330 /*TemplateArgs=*/0, 4331 /*SuppressQualifierCheck=*/true); 4332 if (OpEqualRef.isInvalid()) 4333 return S.StmtError(); 4334 4335 // Build the call to the assignment operator. 4336 Expr *FromE = From.takeAs<Expr>(); 4337 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4338 OpEqualRef.takeAs<Expr>(), 4339 Loc, &FromE, 1, 0, Loc); 4340 if (Call.isInvalid()) 4341 return S.StmtError(); 4342 4343 return S.Owned(Call.takeAs<Stmt>()); 4344 } 4345 4346 // - if the subobject is of scalar type, the built-in assignment 4347 // operator is used. 4348 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4349 if (!ArrayTy) { 4350 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4351 BinaryOperator::Assign, 4352 To.takeAs<Expr>(), 4353 From.takeAs<Expr>()); 4354 if (Assignment.isInvalid()) 4355 return S.StmtError(); 4356 4357 return S.Owned(Assignment.takeAs<Stmt>()); 4358 } 4359 4360 // - if the subobject is an array, each element is assigned, in the 4361 // manner appropriate to the element type; 4362 4363 // Construct a loop over the array bounds, e.g., 4364 // 4365 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4366 // 4367 // that will copy each of the array elements. 4368 QualType SizeType = S.Context.getSizeType(); 4369 4370 // Create the iteration variable. 4371 IdentifierInfo *IterationVarName = 0; 4372 { 4373 llvm::SmallString<8> Str; 4374 llvm::raw_svector_ostream OS(Str); 4375 OS << "__i" << Depth; 4376 IterationVarName = &S.Context.Idents.get(OS.str()); 4377 } 4378 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4379 IterationVarName, SizeType, 4380 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4381 VarDecl::None, VarDecl::None); 4382 4383 // Initialize the iteration variable to zero. 4384 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4385 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4386 4387 // Create a reference to the iteration variable; we'll use this several 4388 // times throughout. 4389 Expr *IterationVarRef 4390 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4391 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4392 4393 // Create the DeclStmt that holds the iteration variable. 4394 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4395 4396 // Create the comparison against the array bound. 4397 llvm::APInt Upper = ArrayTy->getSize(); 4398 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4399 OwningExprResult Comparison 4400 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4401 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4402 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4403 4404 // Create the pre-increment of the iteration variable. 4405 OwningExprResult Increment 4406 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4407 UnaryOperator::PreInc, 4408 SizeType, Loc)); 4409 4410 // Subscript the "from" and "to" expressions with the iteration variable. 4411 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4412 S.Owned(IterationVarRef->Retain()), 4413 Loc); 4414 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4415 S.Owned(IterationVarRef->Retain()), 4416 Loc); 4417 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4418 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4419 4420 // Build the copy for an individual element of the array. 4421 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4422 ArrayTy->getElementType(), 4423 move(To), move(From), 4424 CopyingBaseSubobject, Depth+1); 4425 if (Copy.isInvalid()) { 4426 InitStmt->Destroy(S.Context); 4427 return S.StmtError(); 4428 } 4429 4430 // Construct the loop that copies all elements of this array. 4431 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4432 S.MakeFullExpr(Comparison), 4433 Sema::DeclPtrTy(), 4434 S.MakeFullExpr(Increment), 4435 Loc, move(Copy)); 4436} 4437 4438void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4439 CXXMethodDecl *CopyAssignOperator) { 4440 assert((CopyAssignOperator->isImplicit() && 4441 CopyAssignOperator->isOverloadedOperator() && 4442 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4443 !CopyAssignOperator->isUsed()) && 4444 "DefineImplicitCopyAssignment called for wrong function"); 4445 4446 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4447 4448 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4449 CopyAssignOperator->setInvalidDecl(); 4450 return; 4451 } 4452 4453 CopyAssignOperator->setUsed(); 4454 4455 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4456 ErrorTrap Trap(*this); 4457 4458 // C++0x [class.copy]p30: 4459 // The implicitly-defined or explicitly-defaulted copy assignment operator 4460 // for a non-union class X performs memberwise copy assignment of its 4461 // subobjects. The direct base classes of X are assigned first, in the 4462 // order of their declaration in the base-specifier-list, and then the 4463 // immediate non-static data members of X are assigned, in the order in 4464 // which they were declared in the class definition. 4465 4466 // The statements that form the synthesized function body. 4467 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4468 4469 // The parameter for the "other" object, which we are copying from. 4470 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4471 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4472 QualType OtherRefType = Other->getType(); 4473 if (const LValueReferenceType *OtherRef 4474 = OtherRefType->getAs<LValueReferenceType>()) { 4475 OtherRefType = OtherRef->getPointeeType(); 4476 OtherQuals = OtherRefType.getQualifiers(); 4477 } 4478 4479 // Our location for everything implicitly-generated. 4480 SourceLocation Loc = CopyAssignOperator->getLocation(); 4481 4482 // Construct a reference to the "other" object. We'll be using this 4483 // throughout the generated ASTs. 4484 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4485 assert(OtherRef && "Reference to parameter cannot fail!"); 4486 4487 // Construct the "this" pointer. We'll be using this throughout the generated 4488 // ASTs. 4489 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4490 assert(This && "Reference to this cannot fail!"); 4491 4492 // Assign base classes. 4493 bool Invalid = false; 4494 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4495 E = ClassDecl->bases_end(); Base != E; ++Base) { 4496 // Form the assignment: 4497 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4498 QualType BaseType = Base->getType().getUnqualifiedType(); 4499 CXXRecordDecl *BaseClassDecl = 0; 4500 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4501 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4502 else { 4503 Invalid = true; 4504 continue; 4505 } 4506 4507 // Construct the "from" expression, which is an implicit cast to the 4508 // appropriately-qualified base type. 4509 Expr *From = OtherRef->Retain(); 4510 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4511 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4512 CXXBaseSpecifierArray(Base)); 4513 4514 // Dereference "this". 4515 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4516 Owned(This->Retain())); 4517 4518 // Implicitly cast "this" to the appropriately-qualified base type. 4519 Expr *ToE = To.takeAs<Expr>(); 4520 ImpCastExprToType(ToE, 4521 Context.getCVRQualifiedType(BaseType, 4522 CopyAssignOperator->getTypeQualifiers()), 4523 CastExpr::CK_UncheckedDerivedToBase, 4524 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4525 To = Owned(ToE); 4526 4527 // Build the copy. 4528 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4529 move(To), Owned(From), 4530 /*CopyingBaseSubobject=*/true); 4531 if (Copy.isInvalid()) { 4532 Diag(CurrentLocation, diag::note_member_synthesized_at) 4533 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4534 CopyAssignOperator->setInvalidDecl(); 4535 return; 4536 } 4537 4538 // Success! Record the copy. 4539 Statements.push_back(Copy.takeAs<Expr>()); 4540 } 4541 4542 // \brief Reference to the __builtin_memcpy function. 4543 Expr *BuiltinMemCpyRef = 0; 4544 4545 // Assign non-static members. 4546 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4547 FieldEnd = ClassDecl->field_end(); 4548 Field != FieldEnd; ++Field) { 4549 // Check for members of reference type; we can't copy those. 4550 if (Field->getType()->isReferenceType()) { 4551 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4552 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4553 Diag(Field->getLocation(), diag::note_declared_at); 4554 Diag(CurrentLocation, diag::note_member_synthesized_at) 4555 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4556 Invalid = true; 4557 continue; 4558 } 4559 4560 // Check for members of const-qualified, non-class type. 4561 QualType BaseType = Context.getBaseElementType(Field->getType()); 4562 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4563 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4564 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4565 Diag(Field->getLocation(), diag::note_declared_at); 4566 Diag(CurrentLocation, diag::note_member_synthesized_at) 4567 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4568 Invalid = true; 4569 continue; 4570 } 4571 4572 QualType FieldType = Field->getType().getNonReferenceType(); 4573 4574 // Build references to the field in the object we're copying from and to. 4575 CXXScopeSpec SS; // Intentionally empty 4576 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4577 LookupMemberName); 4578 MemberLookup.addDecl(*Field); 4579 MemberLookup.resolveKind(); 4580 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4581 OtherRefType, 4582 Loc, /*IsArrow=*/false, 4583 SS, 0, MemberLookup, 0); 4584 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4585 This->getType(), 4586 Loc, /*IsArrow=*/true, 4587 SS, 0, MemberLookup, 0); 4588 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4589 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4590 4591 // If the field should be copied with __builtin_memcpy rather than via 4592 // explicit assignments, do so. This optimization only applies for arrays 4593 // of scalars and arrays of class type with trivial copy-assignment 4594 // operators. 4595 if (FieldType->isArrayType() && 4596 (!BaseType->isRecordType() || 4597 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4598 ->hasTrivialCopyAssignment())) { 4599 // Compute the size of the memory buffer to be copied. 4600 QualType SizeType = Context.getSizeType(); 4601 llvm::APInt Size(Context.getTypeSize(SizeType), 4602 Context.getTypeSizeInChars(BaseType).getQuantity()); 4603 for (const ConstantArrayType *Array 4604 = Context.getAsConstantArrayType(FieldType); 4605 Array; 4606 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4607 llvm::APInt ArraySize = Array->getSize(); 4608 ArraySize.zextOrTrunc(Size.getBitWidth()); 4609 Size *= ArraySize; 4610 } 4611 4612 // Take the address of the field references for "from" and "to". 4613 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4614 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4615 4616 // Create a reference to the __builtin_memcpy builtin function. 4617 if (!BuiltinMemCpyRef) { 4618 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4619 LookupOrdinaryName); 4620 LookupName(R, TUScope, true); 4621 4622 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4623 if (!BuiltinMemCpy) { 4624 // Something went horribly wrong earlier, and we will have complained 4625 // about it. 4626 Invalid = true; 4627 continue; 4628 } 4629 4630 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4631 BuiltinMemCpy->getType(), 4632 Loc, 0).takeAs<Expr>(); 4633 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4634 } 4635 4636 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4637 CallArgs.push_back(To.takeAs<Expr>()); 4638 CallArgs.push_back(From.takeAs<Expr>()); 4639 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4640 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4641 Commas.push_back(Loc); 4642 Commas.push_back(Loc); 4643 OwningExprResult Call = ActOnCallExpr(/*Scope=*/0, 4644 Owned(BuiltinMemCpyRef->Retain()), 4645 Loc, move_arg(CallArgs), 4646 Commas.data(), Loc); 4647 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4648 Statements.push_back(Call.takeAs<Expr>()); 4649 continue; 4650 } 4651 4652 // Build the copy of this field. 4653 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4654 move(To), move(From), 4655 /*CopyingBaseSubobject=*/false); 4656 if (Copy.isInvalid()) { 4657 Diag(CurrentLocation, diag::note_member_synthesized_at) 4658 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4659 CopyAssignOperator->setInvalidDecl(); 4660 return; 4661 } 4662 4663 // Success! Record the copy. 4664 Statements.push_back(Copy.takeAs<Stmt>()); 4665 } 4666 4667 if (!Invalid) { 4668 // Add a "return *this;" 4669 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4670 Owned(This->Retain())); 4671 4672 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4673 if (Return.isInvalid()) 4674 Invalid = true; 4675 else { 4676 Statements.push_back(Return.takeAs<Stmt>()); 4677 4678 if (Trap.hasErrorOccurred()) { 4679 Diag(CurrentLocation, diag::note_member_synthesized_at) 4680 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4681 Invalid = true; 4682 } 4683 } 4684 } 4685 4686 if (Invalid) { 4687 CopyAssignOperator->setInvalidDecl(); 4688 return; 4689 } 4690 4691 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4692 /*isStmtExpr=*/false); 4693 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4694 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4695} 4696 4697void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4698 CXXConstructorDecl *CopyConstructor, 4699 unsigned TypeQuals) { 4700 assert((CopyConstructor->isImplicit() && 4701 CopyConstructor->isCopyConstructor(TypeQuals) && 4702 !CopyConstructor->isUsed()) && 4703 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4704 4705 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4706 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4707 4708 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4709 ErrorTrap Trap(*this); 4710 4711 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4712 Trap.hasErrorOccurred()) { 4713 Diag(CurrentLocation, diag::note_member_synthesized_at) 4714 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4715 CopyConstructor->setInvalidDecl(); 4716 } else { 4717 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4718 CopyConstructor->getLocation(), 4719 MultiStmtArg(*this, 0, 0), 4720 /*isStmtExpr=*/false) 4721 .takeAs<Stmt>()); 4722 } 4723 4724 CopyConstructor->setUsed(); 4725} 4726 4727Sema::OwningExprResult 4728Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4729 CXXConstructorDecl *Constructor, 4730 MultiExprArg ExprArgs, 4731 bool RequiresZeroInit, 4732 CXXConstructExpr::ConstructionKind ConstructKind) { 4733 bool Elidable = false; 4734 4735 // C++0x [class.copy]p34: 4736 // When certain criteria are met, an implementation is allowed to 4737 // omit the copy/move construction of a class object, even if the 4738 // copy/move constructor and/or destructor for the object have 4739 // side effects. [...] 4740 // - when a temporary class object that has not been bound to a 4741 // reference (12.2) would be copied/moved to a class object 4742 // with the same cv-unqualified type, the copy/move operation 4743 // can be omitted by constructing the temporary object 4744 // directly into the target of the omitted copy/move 4745 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4746 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4747 Elidable = SubExpr->isTemporaryObject() && 4748 Context.hasSameUnqualifiedType(SubExpr->getType(), 4749 Context.getTypeDeclType(Constructor->getParent())); 4750 } 4751 4752 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4753 Elidable, move(ExprArgs), RequiresZeroInit, 4754 ConstructKind); 4755} 4756 4757/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4758/// including handling of its default argument expressions. 4759Sema::OwningExprResult 4760Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4761 CXXConstructorDecl *Constructor, bool Elidable, 4762 MultiExprArg ExprArgs, 4763 bool RequiresZeroInit, 4764 CXXConstructExpr::ConstructionKind ConstructKind) { 4765 unsigned NumExprs = ExprArgs.size(); 4766 Expr **Exprs = (Expr **)ExprArgs.release(); 4767 4768 MarkDeclarationReferenced(ConstructLoc, Constructor); 4769 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4770 Constructor, Elidable, Exprs, NumExprs, 4771 RequiresZeroInit, ConstructKind)); 4772} 4773 4774bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4775 CXXConstructorDecl *Constructor, 4776 MultiExprArg Exprs) { 4777 OwningExprResult TempResult = 4778 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4779 move(Exprs)); 4780 if (TempResult.isInvalid()) 4781 return true; 4782 4783 Expr *Temp = TempResult.takeAs<Expr>(); 4784 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4785 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4786 VD->setInit(Temp); 4787 4788 return false; 4789} 4790 4791void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4792 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4793 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4794 !ClassDecl->hasTrivialDestructor()) { 4795 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4796 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4797 CheckDestructorAccess(VD->getLocation(), Destructor, 4798 PDiag(diag::err_access_dtor_var) 4799 << VD->getDeclName() 4800 << VD->getType()); 4801 } 4802} 4803 4804/// AddCXXDirectInitializerToDecl - This action is called immediately after 4805/// ActOnDeclarator, when a C++ direct initializer is present. 4806/// e.g: "int x(1);" 4807void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4808 SourceLocation LParenLoc, 4809 MultiExprArg Exprs, 4810 SourceLocation *CommaLocs, 4811 SourceLocation RParenLoc) { 4812 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4813 Decl *RealDecl = Dcl.getAs<Decl>(); 4814 4815 // If there is no declaration, there was an error parsing it. Just ignore 4816 // the initializer. 4817 if (RealDecl == 0) 4818 return; 4819 4820 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4821 if (!VDecl) { 4822 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4823 RealDecl->setInvalidDecl(); 4824 return; 4825 } 4826 4827 // We will represent direct-initialization similarly to copy-initialization: 4828 // int x(1); -as-> int x = 1; 4829 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4830 // 4831 // Clients that want to distinguish between the two forms, can check for 4832 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4833 // A major benefit is that clients that don't particularly care about which 4834 // exactly form was it (like the CodeGen) can handle both cases without 4835 // special case code. 4836 4837 // C++ 8.5p11: 4838 // The form of initialization (using parentheses or '=') is generally 4839 // insignificant, but does matter when the entity being initialized has a 4840 // class type. 4841 QualType DeclInitType = VDecl->getType(); 4842 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4843 DeclInitType = Context.getBaseElementType(Array); 4844 4845 if (!VDecl->getType()->isDependentType() && 4846 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4847 diag::err_typecheck_decl_incomplete_type)) { 4848 VDecl->setInvalidDecl(); 4849 return; 4850 } 4851 4852 // The variable can not have an abstract class type. 4853 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4854 diag::err_abstract_type_in_decl, 4855 AbstractVariableType)) 4856 VDecl->setInvalidDecl(); 4857 4858 const VarDecl *Def; 4859 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4860 Diag(VDecl->getLocation(), diag::err_redefinition) 4861 << VDecl->getDeclName(); 4862 Diag(Def->getLocation(), diag::note_previous_definition); 4863 VDecl->setInvalidDecl(); 4864 return; 4865 } 4866 4867 // If either the declaration has a dependent type or if any of the 4868 // expressions is type-dependent, we represent the initialization 4869 // via a ParenListExpr for later use during template instantiation. 4870 if (VDecl->getType()->isDependentType() || 4871 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4872 // Let clients know that initialization was done with a direct initializer. 4873 VDecl->setCXXDirectInitializer(true); 4874 4875 // Store the initialization expressions as a ParenListExpr. 4876 unsigned NumExprs = Exprs.size(); 4877 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4878 (Expr **)Exprs.release(), 4879 NumExprs, RParenLoc)); 4880 return; 4881 } 4882 4883 // Capture the variable that is being initialized and the style of 4884 // initialization. 4885 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4886 4887 // FIXME: Poor source location information. 4888 InitializationKind Kind 4889 = InitializationKind::CreateDirect(VDecl->getLocation(), 4890 LParenLoc, RParenLoc); 4891 4892 InitializationSequence InitSeq(*this, Entity, Kind, 4893 (Expr**)Exprs.get(), Exprs.size()); 4894 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4895 if (Result.isInvalid()) { 4896 VDecl->setInvalidDecl(); 4897 return; 4898 } 4899 4900 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4901 VDecl->setInit(Result.takeAs<Expr>()); 4902 VDecl->setCXXDirectInitializer(true); 4903 4904 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4905 FinalizeVarWithDestructor(VDecl, Record); 4906} 4907 4908/// \brief Given a constructor and the set of arguments provided for the 4909/// constructor, convert the arguments and add any required default arguments 4910/// to form a proper call to this constructor. 4911/// 4912/// \returns true if an error occurred, false otherwise. 4913bool 4914Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4915 MultiExprArg ArgsPtr, 4916 SourceLocation Loc, 4917 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4918 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4919 unsigned NumArgs = ArgsPtr.size(); 4920 Expr **Args = (Expr **)ArgsPtr.get(); 4921 4922 const FunctionProtoType *Proto 4923 = Constructor->getType()->getAs<FunctionProtoType>(); 4924 assert(Proto && "Constructor without a prototype?"); 4925 unsigned NumArgsInProto = Proto->getNumArgs(); 4926 4927 // If too few arguments are available, we'll fill in the rest with defaults. 4928 if (NumArgs < NumArgsInProto) 4929 ConvertedArgs.reserve(NumArgsInProto); 4930 else 4931 ConvertedArgs.reserve(NumArgs); 4932 4933 VariadicCallType CallType = 4934 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4935 llvm::SmallVector<Expr *, 8> AllArgs; 4936 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4937 Proto, 0, Args, NumArgs, AllArgs, 4938 CallType); 4939 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4940 ConvertedArgs.push_back(AllArgs[i]); 4941 return Invalid; 4942} 4943 4944static inline bool 4945CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4946 const FunctionDecl *FnDecl) { 4947 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4948 if (isa<NamespaceDecl>(DC)) { 4949 return SemaRef.Diag(FnDecl->getLocation(), 4950 diag::err_operator_new_delete_declared_in_namespace) 4951 << FnDecl->getDeclName(); 4952 } 4953 4954 if (isa<TranslationUnitDecl>(DC) && 4955 FnDecl->getStorageClass() == FunctionDecl::Static) { 4956 return SemaRef.Diag(FnDecl->getLocation(), 4957 diag::err_operator_new_delete_declared_static) 4958 << FnDecl->getDeclName(); 4959 } 4960 4961 return false; 4962} 4963 4964static inline bool 4965CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4966 CanQualType ExpectedResultType, 4967 CanQualType ExpectedFirstParamType, 4968 unsigned DependentParamTypeDiag, 4969 unsigned InvalidParamTypeDiag) { 4970 QualType ResultType = 4971 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4972 4973 // Check that the result type is not dependent. 4974 if (ResultType->isDependentType()) 4975 return SemaRef.Diag(FnDecl->getLocation(), 4976 diag::err_operator_new_delete_dependent_result_type) 4977 << FnDecl->getDeclName() << ExpectedResultType; 4978 4979 // Check that the result type is what we expect. 4980 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4981 return SemaRef.Diag(FnDecl->getLocation(), 4982 diag::err_operator_new_delete_invalid_result_type) 4983 << FnDecl->getDeclName() << ExpectedResultType; 4984 4985 // A function template must have at least 2 parameters. 4986 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4987 return SemaRef.Diag(FnDecl->getLocation(), 4988 diag::err_operator_new_delete_template_too_few_parameters) 4989 << FnDecl->getDeclName(); 4990 4991 // The function decl must have at least 1 parameter. 4992 if (FnDecl->getNumParams() == 0) 4993 return SemaRef.Diag(FnDecl->getLocation(), 4994 diag::err_operator_new_delete_too_few_parameters) 4995 << FnDecl->getDeclName(); 4996 4997 // Check the the first parameter type is not dependent. 4998 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4999 if (FirstParamType->isDependentType()) 5000 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5001 << FnDecl->getDeclName() << ExpectedFirstParamType; 5002 5003 // Check that the first parameter type is what we expect. 5004 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5005 ExpectedFirstParamType) 5006 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5007 << FnDecl->getDeclName() << ExpectedFirstParamType; 5008 5009 return false; 5010} 5011 5012static bool 5013CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5014 // C++ [basic.stc.dynamic.allocation]p1: 5015 // A program is ill-formed if an allocation function is declared in a 5016 // namespace scope other than global scope or declared static in global 5017 // scope. 5018 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5019 return true; 5020 5021 CanQualType SizeTy = 5022 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5023 5024 // C++ [basic.stc.dynamic.allocation]p1: 5025 // The return type shall be void*. The first parameter shall have type 5026 // std::size_t. 5027 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5028 SizeTy, 5029 diag::err_operator_new_dependent_param_type, 5030 diag::err_operator_new_param_type)) 5031 return true; 5032 5033 // C++ [basic.stc.dynamic.allocation]p1: 5034 // The first parameter shall not have an associated default argument. 5035 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5036 return SemaRef.Diag(FnDecl->getLocation(), 5037 diag::err_operator_new_default_arg) 5038 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5039 5040 return false; 5041} 5042 5043static bool 5044CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5045 // C++ [basic.stc.dynamic.deallocation]p1: 5046 // A program is ill-formed if deallocation functions are declared in a 5047 // namespace scope other than global scope or declared static in global 5048 // scope. 5049 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5050 return true; 5051 5052 // C++ [basic.stc.dynamic.deallocation]p2: 5053 // Each deallocation function shall return void and its first parameter 5054 // shall be void*. 5055 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5056 SemaRef.Context.VoidPtrTy, 5057 diag::err_operator_delete_dependent_param_type, 5058 diag::err_operator_delete_param_type)) 5059 return true; 5060 5061 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5062 if (FirstParamType->isDependentType()) 5063 return SemaRef.Diag(FnDecl->getLocation(), 5064 diag::err_operator_delete_dependent_param_type) 5065 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5066 5067 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5068 SemaRef.Context.VoidPtrTy) 5069 return SemaRef.Diag(FnDecl->getLocation(), 5070 diag::err_operator_delete_param_type) 5071 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5072 5073 return false; 5074} 5075 5076/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5077/// of this overloaded operator is well-formed. If so, returns false; 5078/// otherwise, emits appropriate diagnostics and returns true. 5079bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5080 assert(FnDecl && FnDecl->isOverloadedOperator() && 5081 "Expected an overloaded operator declaration"); 5082 5083 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5084 5085 // C++ [over.oper]p5: 5086 // The allocation and deallocation functions, operator new, 5087 // operator new[], operator delete and operator delete[], are 5088 // described completely in 3.7.3. The attributes and restrictions 5089 // found in the rest of this subclause do not apply to them unless 5090 // explicitly stated in 3.7.3. 5091 if (Op == OO_Delete || Op == OO_Array_Delete) 5092 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5093 5094 if (Op == OO_New || Op == OO_Array_New) 5095 return CheckOperatorNewDeclaration(*this, FnDecl); 5096 5097 // C++ [over.oper]p6: 5098 // An operator function shall either be a non-static member 5099 // function or be a non-member function and have at least one 5100 // parameter whose type is a class, a reference to a class, an 5101 // enumeration, or a reference to an enumeration. 5102 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5103 if (MethodDecl->isStatic()) 5104 return Diag(FnDecl->getLocation(), 5105 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5106 } else { 5107 bool ClassOrEnumParam = false; 5108 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5109 ParamEnd = FnDecl->param_end(); 5110 Param != ParamEnd; ++Param) { 5111 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5112 if (ParamType->isDependentType() || ParamType->isRecordType() || 5113 ParamType->isEnumeralType()) { 5114 ClassOrEnumParam = true; 5115 break; 5116 } 5117 } 5118 5119 if (!ClassOrEnumParam) 5120 return Diag(FnDecl->getLocation(), 5121 diag::err_operator_overload_needs_class_or_enum) 5122 << FnDecl->getDeclName(); 5123 } 5124 5125 // C++ [over.oper]p8: 5126 // An operator function cannot have default arguments (8.3.6), 5127 // except where explicitly stated below. 5128 // 5129 // Only the function-call operator allows default arguments 5130 // (C++ [over.call]p1). 5131 if (Op != OO_Call) { 5132 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5133 Param != FnDecl->param_end(); ++Param) { 5134 if ((*Param)->hasDefaultArg()) 5135 return Diag((*Param)->getLocation(), 5136 diag::err_operator_overload_default_arg) 5137 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5138 } 5139 } 5140 5141 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5142 { false, false, false } 5143#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5144 , { Unary, Binary, MemberOnly } 5145#include "clang/Basic/OperatorKinds.def" 5146 }; 5147 5148 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5149 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5150 bool MustBeMemberOperator = OperatorUses[Op][2]; 5151 5152 // C++ [over.oper]p8: 5153 // [...] Operator functions cannot have more or fewer parameters 5154 // than the number required for the corresponding operator, as 5155 // described in the rest of this subclause. 5156 unsigned NumParams = FnDecl->getNumParams() 5157 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5158 if (Op != OO_Call && 5159 ((NumParams == 1 && !CanBeUnaryOperator) || 5160 (NumParams == 2 && !CanBeBinaryOperator) || 5161 (NumParams < 1) || (NumParams > 2))) { 5162 // We have the wrong number of parameters. 5163 unsigned ErrorKind; 5164 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5165 ErrorKind = 2; // 2 -> unary or binary. 5166 } else if (CanBeUnaryOperator) { 5167 ErrorKind = 0; // 0 -> unary 5168 } else { 5169 assert(CanBeBinaryOperator && 5170 "All non-call overloaded operators are unary or binary!"); 5171 ErrorKind = 1; // 1 -> binary 5172 } 5173 5174 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5175 << FnDecl->getDeclName() << NumParams << ErrorKind; 5176 } 5177 5178 // Overloaded operators other than operator() cannot be variadic. 5179 if (Op != OO_Call && 5180 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5181 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5182 << FnDecl->getDeclName(); 5183 } 5184 5185 // Some operators must be non-static member functions. 5186 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5187 return Diag(FnDecl->getLocation(), 5188 diag::err_operator_overload_must_be_member) 5189 << FnDecl->getDeclName(); 5190 } 5191 5192 // C++ [over.inc]p1: 5193 // The user-defined function called operator++ implements the 5194 // prefix and postfix ++ operator. If this function is a member 5195 // function with no parameters, or a non-member function with one 5196 // parameter of class or enumeration type, it defines the prefix 5197 // increment operator ++ for objects of that type. If the function 5198 // is a member function with one parameter (which shall be of type 5199 // int) or a non-member function with two parameters (the second 5200 // of which shall be of type int), it defines the postfix 5201 // increment operator ++ for objects of that type. 5202 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5203 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5204 bool ParamIsInt = false; 5205 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5206 ParamIsInt = BT->getKind() == BuiltinType::Int; 5207 5208 if (!ParamIsInt) 5209 return Diag(LastParam->getLocation(), 5210 diag::err_operator_overload_post_incdec_must_be_int) 5211 << LastParam->getType() << (Op == OO_MinusMinus); 5212 } 5213 5214 // Notify the class if it got an assignment operator. 5215 if (Op == OO_Equal) { 5216 // Would have returned earlier otherwise. 5217 assert(isa<CXXMethodDecl>(FnDecl) && 5218 "Overloaded = not member, but not filtered."); 5219 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5220 Method->getParent()->addedAssignmentOperator(Context, Method); 5221 } 5222 5223 return false; 5224} 5225 5226/// CheckLiteralOperatorDeclaration - Check whether the declaration 5227/// of this literal operator function is well-formed. If so, returns 5228/// false; otherwise, emits appropriate diagnostics and returns true. 5229bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5230 DeclContext *DC = FnDecl->getDeclContext(); 5231 Decl::Kind Kind = DC->getDeclKind(); 5232 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5233 Kind != Decl::LinkageSpec) { 5234 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5235 << FnDecl->getDeclName(); 5236 return true; 5237 } 5238 5239 bool Valid = false; 5240 5241 // template <char...> type operator "" name() is the only valid template 5242 // signature, and the only valid signature with no parameters. 5243 if (FnDecl->param_size() == 0) { 5244 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5245 // Must have only one template parameter 5246 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5247 if (Params->size() == 1) { 5248 NonTypeTemplateParmDecl *PmDecl = 5249 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5250 5251 // The template parameter must be a char parameter pack. 5252 // FIXME: This test will always fail because non-type parameter packs 5253 // have not been implemented. 5254 if (PmDecl && PmDecl->isTemplateParameterPack() && 5255 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5256 Valid = true; 5257 } 5258 } 5259 } else { 5260 // Check the first parameter 5261 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5262 5263 QualType T = (*Param)->getType(); 5264 5265 // unsigned long long int, long double, and any character type are allowed 5266 // as the only parameters. 5267 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5268 Context.hasSameType(T, Context.LongDoubleTy) || 5269 Context.hasSameType(T, Context.CharTy) || 5270 Context.hasSameType(T, Context.WCharTy) || 5271 Context.hasSameType(T, Context.Char16Ty) || 5272 Context.hasSameType(T, Context.Char32Ty)) { 5273 if (++Param == FnDecl->param_end()) 5274 Valid = true; 5275 goto FinishedParams; 5276 } 5277 5278 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5279 const PointerType *PT = T->getAs<PointerType>(); 5280 if (!PT) 5281 goto FinishedParams; 5282 T = PT->getPointeeType(); 5283 if (!T.isConstQualified()) 5284 goto FinishedParams; 5285 T = T.getUnqualifiedType(); 5286 5287 // Move on to the second parameter; 5288 ++Param; 5289 5290 // If there is no second parameter, the first must be a const char * 5291 if (Param == FnDecl->param_end()) { 5292 if (Context.hasSameType(T, Context.CharTy)) 5293 Valid = true; 5294 goto FinishedParams; 5295 } 5296 5297 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5298 // are allowed as the first parameter to a two-parameter function 5299 if (!(Context.hasSameType(T, Context.CharTy) || 5300 Context.hasSameType(T, Context.WCharTy) || 5301 Context.hasSameType(T, Context.Char16Ty) || 5302 Context.hasSameType(T, Context.Char32Ty))) 5303 goto FinishedParams; 5304 5305 // The second and final parameter must be an std::size_t 5306 T = (*Param)->getType().getUnqualifiedType(); 5307 if (Context.hasSameType(T, Context.getSizeType()) && 5308 ++Param == FnDecl->param_end()) 5309 Valid = true; 5310 } 5311 5312 // FIXME: This diagnostic is absolutely terrible. 5313FinishedParams: 5314 if (!Valid) { 5315 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5316 << FnDecl->getDeclName(); 5317 return true; 5318 } 5319 5320 return false; 5321} 5322 5323/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5324/// linkage specification, including the language and (if present) 5325/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5326/// the location of the language string literal, which is provided 5327/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5328/// the '{' brace. Otherwise, this linkage specification does not 5329/// have any braces. 5330Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5331 SourceLocation ExternLoc, 5332 SourceLocation LangLoc, 5333 llvm::StringRef Lang, 5334 SourceLocation LBraceLoc) { 5335 LinkageSpecDecl::LanguageIDs Language; 5336 if (Lang == "\"C\"") 5337 Language = LinkageSpecDecl::lang_c; 5338 else if (Lang == "\"C++\"") 5339 Language = LinkageSpecDecl::lang_cxx; 5340 else { 5341 Diag(LangLoc, diag::err_bad_language); 5342 return DeclPtrTy(); 5343 } 5344 5345 // FIXME: Add all the various semantics of linkage specifications 5346 5347 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5348 LangLoc, Language, 5349 LBraceLoc.isValid()); 5350 CurContext->addDecl(D); 5351 PushDeclContext(S, D); 5352 return DeclPtrTy::make(D); 5353} 5354 5355/// ActOnFinishLinkageSpecification - Completely the definition of 5356/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5357/// valid, it's the position of the closing '}' brace in a linkage 5358/// specification that uses braces. 5359Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5360 DeclPtrTy LinkageSpec, 5361 SourceLocation RBraceLoc) { 5362 if (LinkageSpec) 5363 PopDeclContext(); 5364 return LinkageSpec; 5365} 5366 5367/// \brief Perform semantic analysis for the variable declaration that 5368/// occurs within a C++ catch clause, returning the newly-created 5369/// variable. 5370VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5371 TypeSourceInfo *TInfo, 5372 IdentifierInfo *Name, 5373 SourceLocation Loc, 5374 SourceRange Range) { 5375 bool Invalid = false; 5376 5377 // Arrays and functions decay. 5378 if (ExDeclType->isArrayType()) 5379 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5380 else if (ExDeclType->isFunctionType()) 5381 ExDeclType = Context.getPointerType(ExDeclType); 5382 5383 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5384 // The exception-declaration shall not denote a pointer or reference to an 5385 // incomplete type, other than [cv] void*. 5386 // N2844 forbids rvalue references. 5387 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5388 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5389 Invalid = true; 5390 } 5391 5392 // GCC allows catching pointers and references to incomplete types 5393 // as an extension; so do we, but we warn by default. 5394 5395 QualType BaseType = ExDeclType; 5396 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5397 unsigned DK = diag::err_catch_incomplete; 5398 bool IncompleteCatchIsInvalid = true; 5399 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5400 BaseType = Ptr->getPointeeType(); 5401 Mode = 1; 5402 DK = diag::ext_catch_incomplete_ptr; 5403 IncompleteCatchIsInvalid = false; 5404 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5405 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5406 BaseType = Ref->getPointeeType(); 5407 Mode = 2; 5408 DK = diag::ext_catch_incomplete_ref; 5409 IncompleteCatchIsInvalid = false; 5410 } 5411 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5412 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5413 IncompleteCatchIsInvalid) 5414 Invalid = true; 5415 5416 if (!Invalid && !ExDeclType->isDependentType() && 5417 RequireNonAbstractType(Loc, ExDeclType, 5418 diag::err_abstract_type_in_decl, 5419 AbstractVariableType)) 5420 Invalid = true; 5421 5422 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5423 Name, ExDeclType, TInfo, VarDecl::None, 5424 VarDecl::None); 5425 ExDecl->setExceptionVariable(true); 5426 5427 if (!Invalid) { 5428 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5429 // C++ [except.handle]p16: 5430 // The object declared in an exception-declaration or, if the 5431 // exception-declaration does not specify a name, a temporary (12.2) is 5432 // copy-initialized (8.5) from the exception object. [...] 5433 // The object is destroyed when the handler exits, after the destruction 5434 // of any automatic objects initialized within the handler. 5435 // 5436 // We just pretend to initialize the object with itself, then make sure 5437 // it can be destroyed later. 5438 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5439 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5440 Loc, ExDeclType, 0); 5441 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5442 SourceLocation()); 5443 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5444 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5445 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5446 if (Result.isInvalid()) 5447 Invalid = true; 5448 else 5449 FinalizeVarWithDestructor(ExDecl, RecordTy); 5450 } 5451 } 5452 5453 if (Invalid) 5454 ExDecl->setInvalidDecl(); 5455 5456 return ExDecl; 5457} 5458 5459/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5460/// handler. 5461Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5462 TypeSourceInfo *TInfo = 0; 5463 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5464 5465 bool Invalid = D.isInvalidType(); 5466 IdentifierInfo *II = D.getIdentifier(); 5467 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5468 LookupOrdinaryName, 5469 ForRedeclaration)) { 5470 // The scope should be freshly made just for us. There is just no way 5471 // it contains any previous declaration. 5472 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5473 if (PrevDecl->isTemplateParameter()) { 5474 // Maybe we will complain about the shadowed template parameter. 5475 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5476 } 5477 } 5478 5479 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5480 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5481 << D.getCXXScopeSpec().getRange(); 5482 Invalid = true; 5483 } 5484 5485 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5486 D.getIdentifier(), 5487 D.getIdentifierLoc(), 5488 D.getDeclSpec().getSourceRange()); 5489 5490 if (Invalid) 5491 ExDecl->setInvalidDecl(); 5492 5493 // Add the exception declaration into this scope. 5494 if (II) 5495 PushOnScopeChains(ExDecl, S); 5496 else 5497 CurContext->addDecl(ExDecl); 5498 5499 ProcessDeclAttributes(S, ExDecl, D); 5500 return DeclPtrTy::make(ExDecl); 5501} 5502 5503Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5504 ExprArg assertexpr, 5505 ExprArg assertmessageexpr) { 5506 Expr *AssertExpr = (Expr *)assertexpr.get(); 5507 StringLiteral *AssertMessage = 5508 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5509 5510 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5511 llvm::APSInt Value(32); 5512 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5513 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5514 AssertExpr->getSourceRange(); 5515 return DeclPtrTy(); 5516 } 5517 5518 if (Value == 0) { 5519 Diag(AssertLoc, diag::err_static_assert_failed) 5520 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5521 } 5522 } 5523 5524 assertexpr.release(); 5525 assertmessageexpr.release(); 5526 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5527 AssertExpr, AssertMessage); 5528 5529 CurContext->addDecl(Decl); 5530 return DeclPtrTy::make(Decl); 5531} 5532 5533/// \brief Perform semantic analysis of the given friend type declaration. 5534/// 5535/// \returns A friend declaration that. 5536FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5537 TypeSourceInfo *TSInfo) { 5538 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5539 5540 QualType T = TSInfo->getType(); 5541 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5542 5543 if (!getLangOptions().CPlusPlus0x) { 5544 // C++03 [class.friend]p2: 5545 // An elaborated-type-specifier shall be used in a friend declaration 5546 // for a class.* 5547 // 5548 // * The class-key of the elaborated-type-specifier is required. 5549 if (!ActiveTemplateInstantiations.empty()) { 5550 // Do not complain about the form of friend template types during 5551 // template instantiation; we will already have complained when the 5552 // template was declared. 5553 } else if (!T->isElaboratedTypeSpecifier()) { 5554 // If we evaluated the type to a record type, suggest putting 5555 // a tag in front. 5556 if (const RecordType *RT = T->getAs<RecordType>()) { 5557 RecordDecl *RD = RT->getDecl(); 5558 5559 std::string InsertionText = std::string(" ") + RD->getKindName(); 5560 5561 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5562 << (unsigned) RD->getTagKind() 5563 << T 5564 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5565 InsertionText); 5566 } else { 5567 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5568 << T 5569 << SourceRange(FriendLoc, TypeRange.getEnd()); 5570 } 5571 } else if (T->getAs<EnumType>()) { 5572 Diag(FriendLoc, diag::ext_enum_friend) 5573 << T 5574 << SourceRange(FriendLoc, TypeRange.getEnd()); 5575 } 5576 } 5577 5578 // C++0x [class.friend]p3: 5579 // If the type specifier in a friend declaration designates a (possibly 5580 // cv-qualified) class type, that class is declared as a friend; otherwise, 5581 // the friend declaration is ignored. 5582 5583 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5584 // in [class.friend]p3 that we do not implement. 5585 5586 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5587} 5588 5589/// Handle a friend type declaration. This works in tandem with 5590/// ActOnTag. 5591/// 5592/// Notes on friend class templates: 5593/// 5594/// We generally treat friend class declarations as if they were 5595/// declaring a class. So, for example, the elaborated type specifier 5596/// in a friend declaration is required to obey the restrictions of a 5597/// class-head (i.e. no typedefs in the scope chain), template 5598/// parameters are required to match up with simple template-ids, &c. 5599/// However, unlike when declaring a template specialization, it's 5600/// okay to refer to a template specialization without an empty 5601/// template parameter declaration, e.g. 5602/// friend class A<T>::B<unsigned>; 5603/// We permit this as a special case; if there are any template 5604/// parameters present at all, require proper matching, i.e. 5605/// template <> template <class T> friend class A<int>::B; 5606Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5607 MultiTemplateParamsArg TempParams) { 5608 SourceLocation Loc = DS.getSourceRange().getBegin(); 5609 5610 assert(DS.isFriendSpecified()); 5611 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5612 5613 // Try to convert the decl specifier to a type. This works for 5614 // friend templates because ActOnTag never produces a ClassTemplateDecl 5615 // for a TUK_Friend. 5616 Declarator TheDeclarator(DS, Declarator::MemberContext); 5617 TypeSourceInfo *TSI; 5618 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5619 if (TheDeclarator.isInvalidType()) 5620 return DeclPtrTy(); 5621 5622 if (!TSI) 5623 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5624 5625 // This is definitely an error in C++98. It's probably meant to 5626 // be forbidden in C++0x, too, but the specification is just 5627 // poorly written. 5628 // 5629 // The problem is with declarations like the following: 5630 // template <T> friend A<T>::foo; 5631 // where deciding whether a class C is a friend or not now hinges 5632 // on whether there exists an instantiation of A that causes 5633 // 'foo' to equal C. There are restrictions on class-heads 5634 // (which we declare (by fiat) elaborated friend declarations to 5635 // be) that makes this tractable. 5636 // 5637 // FIXME: handle "template <> friend class A<T>;", which 5638 // is possibly well-formed? Who even knows? 5639 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5640 Diag(Loc, diag::err_tagless_friend_type_template) 5641 << DS.getSourceRange(); 5642 return DeclPtrTy(); 5643 } 5644 5645 // C++98 [class.friend]p1: A friend of a class is a function 5646 // or class that is not a member of the class . . . 5647 // This is fixed in DR77, which just barely didn't make the C++03 5648 // deadline. It's also a very silly restriction that seriously 5649 // affects inner classes and which nobody else seems to implement; 5650 // thus we never diagnose it, not even in -pedantic. 5651 // 5652 // But note that we could warn about it: it's always useless to 5653 // friend one of your own members (it's not, however, worthless to 5654 // friend a member of an arbitrary specialization of your template). 5655 5656 Decl *D; 5657 if (unsigned NumTempParamLists = TempParams.size()) 5658 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5659 NumTempParamLists, 5660 (TemplateParameterList**) TempParams.release(), 5661 TSI, 5662 DS.getFriendSpecLoc()); 5663 else 5664 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5665 5666 if (!D) 5667 return DeclPtrTy(); 5668 5669 D->setAccess(AS_public); 5670 CurContext->addDecl(D); 5671 5672 return DeclPtrTy::make(D); 5673} 5674 5675Sema::DeclPtrTy 5676Sema::ActOnFriendFunctionDecl(Scope *S, 5677 Declarator &D, 5678 bool IsDefinition, 5679 MultiTemplateParamsArg TemplateParams) { 5680 const DeclSpec &DS = D.getDeclSpec(); 5681 5682 assert(DS.isFriendSpecified()); 5683 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5684 5685 SourceLocation Loc = D.getIdentifierLoc(); 5686 TypeSourceInfo *TInfo = 0; 5687 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5688 5689 // C++ [class.friend]p1 5690 // A friend of a class is a function or class.... 5691 // Note that this sees through typedefs, which is intended. 5692 // It *doesn't* see through dependent types, which is correct 5693 // according to [temp.arg.type]p3: 5694 // If a declaration acquires a function type through a 5695 // type dependent on a template-parameter and this causes 5696 // a declaration that does not use the syntactic form of a 5697 // function declarator to have a function type, the program 5698 // is ill-formed. 5699 if (!T->isFunctionType()) { 5700 Diag(Loc, diag::err_unexpected_friend); 5701 5702 // It might be worthwhile to try to recover by creating an 5703 // appropriate declaration. 5704 return DeclPtrTy(); 5705 } 5706 5707 // C++ [namespace.memdef]p3 5708 // - If a friend declaration in a non-local class first declares a 5709 // class or function, the friend class or function is a member 5710 // of the innermost enclosing namespace. 5711 // - The name of the friend is not found by simple name lookup 5712 // until a matching declaration is provided in that namespace 5713 // scope (either before or after the class declaration granting 5714 // friendship). 5715 // - If a friend function is called, its name may be found by the 5716 // name lookup that considers functions from namespaces and 5717 // classes associated with the types of the function arguments. 5718 // - When looking for a prior declaration of a class or a function 5719 // declared as a friend, scopes outside the innermost enclosing 5720 // namespace scope are not considered. 5721 5722 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5723 DeclarationName Name = GetNameForDeclarator(D); 5724 assert(Name); 5725 5726 // The context we found the declaration in, or in which we should 5727 // create the declaration. 5728 DeclContext *DC; 5729 5730 // FIXME: handle local classes 5731 5732 // Recover from invalid scope qualifiers as if they just weren't there. 5733 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5734 ForRedeclaration); 5735 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5736 DC = computeDeclContext(ScopeQual); 5737 5738 // FIXME: handle dependent contexts 5739 if (!DC) return DeclPtrTy(); 5740 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5741 5742 LookupQualifiedName(Previous, DC); 5743 5744 // If searching in that context implicitly found a declaration in 5745 // a different context, treat it like it wasn't found at all. 5746 // TODO: better diagnostics for this case. Suggesting the right 5747 // qualified scope would be nice... 5748 // FIXME: getRepresentativeDecl() is not right here at all 5749 if (Previous.empty() || 5750 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5751 D.setInvalidType(); 5752 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5753 return DeclPtrTy(); 5754 } 5755 5756 // C++ [class.friend]p1: A friend of a class is a function or 5757 // class that is not a member of the class . . . 5758 if (DC->Equals(CurContext)) 5759 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5760 5761 // Otherwise walk out to the nearest namespace scope looking for matches. 5762 } else { 5763 // TODO: handle local class contexts. 5764 5765 DC = CurContext; 5766 while (true) { 5767 // Skip class contexts. If someone can cite chapter and verse 5768 // for this behavior, that would be nice --- it's what GCC and 5769 // EDG do, and it seems like a reasonable intent, but the spec 5770 // really only says that checks for unqualified existing 5771 // declarations should stop at the nearest enclosing namespace, 5772 // not that they should only consider the nearest enclosing 5773 // namespace. 5774 while (DC->isRecord()) 5775 DC = DC->getParent(); 5776 5777 LookupQualifiedName(Previous, DC); 5778 5779 // TODO: decide what we think about using declarations. 5780 if (!Previous.empty()) 5781 break; 5782 5783 if (DC->isFileContext()) break; 5784 DC = DC->getParent(); 5785 } 5786 5787 // C++ [class.friend]p1: A friend of a class is a function or 5788 // class that is not a member of the class . . . 5789 // C++0x changes this for both friend types and functions. 5790 // Most C++ 98 compilers do seem to give an error here, so 5791 // we do, too. 5792 if (!Previous.empty() && DC->Equals(CurContext) 5793 && !getLangOptions().CPlusPlus0x) 5794 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5795 } 5796 5797 if (DC->isFileContext()) { 5798 // This implies that it has to be an operator or function. 5799 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5800 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5801 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5802 Diag(Loc, diag::err_introducing_special_friend) << 5803 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5804 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5805 return DeclPtrTy(); 5806 } 5807 } 5808 5809 bool Redeclaration = false; 5810 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5811 move(TemplateParams), 5812 IsDefinition, 5813 Redeclaration); 5814 if (!ND) return DeclPtrTy(); 5815 5816 assert(ND->getDeclContext() == DC); 5817 assert(ND->getLexicalDeclContext() == CurContext); 5818 5819 // Add the function declaration to the appropriate lookup tables, 5820 // adjusting the redeclarations list as necessary. We don't 5821 // want to do this yet if the friending class is dependent. 5822 // 5823 // Also update the scope-based lookup if the target context's 5824 // lookup context is in lexical scope. 5825 if (!CurContext->isDependentContext()) { 5826 DC = DC->getLookupContext(); 5827 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5828 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5829 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5830 } 5831 5832 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5833 D.getIdentifierLoc(), ND, 5834 DS.getFriendSpecLoc()); 5835 FrD->setAccess(AS_public); 5836 CurContext->addDecl(FrD); 5837 5838 return DeclPtrTy::make(ND); 5839} 5840 5841void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5842 AdjustDeclIfTemplate(dcl); 5843 5844 Decl *Dcl = dcl.getAs<Decl>(); 5845 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5846 if (!Fn) { 5847 Diag(DelLoc, diag::err_deleted_non_function); 5848 return; 5849 } 5850 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5851 Diag(DelLoc, diag::err_deleted_decl_not_first); 5852 Diag(Prev->getLocation(), diag::note_previous_declaration); 5853 // If the declaration wasn't the first, we delete the function anyway for 5854 // recovery. 5855 } 5856 Fn->setDeleted(); 5857} 5858 5859static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5860 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5861 ++CI) { 5862 Stmt *SubStmt = *CI; 5863 if (!SubStmt) 5864 continue; 5865 if (isa<ReturnStmt>(SubStmt)) 5866 Self.Diag(SubStmt->getSourceRange().getBegin(), 5867 diag::err_return_in_constructor_handler); 5868 if (!isa<Expr>(SubStmt)) 5869 SearchForReturnInStmt(Self, SubStmt); 5870 } 5871} 5872 5873void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5874 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5875 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5876 SearchForReturnInStmt(*this, Handler); 5877 } 5878} 5879 5880bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5881 const CXXMethodDecl *Old) { 5882 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5883 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5884 5885 if (Context.hasSameType(NewTy, OldTy) || 5886 NewTy->isDependentType() || OldTy->isDependentType()) 5887 return false; 5888 5889 // Check if the return types are covariant 5890 QualType NewClassTy, OldClassTy; 5891 5892 /// Both types must be pointers or references to classes. 5893 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5894 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5895 NewClassTy = NewPT->getPointeeType(); 5896 OldClassTy = OldPT->getPointeeType(); 5897 } 5898 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5899 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5900 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5901 NewClassTy = NewRT->getPointeeType(); 5902 OldClassTy = OldRT->getPointeeType(); 5903 } 5904 } 5905 } 5906 5907 // The return types aren't either both pointers or references to a class type. 5908 if (NewClassTy.isNull()) { 5909 Diag(New->getLocation(), 5910 diag::err_different_return_type_for_overriding_virtual_function) 5911 << New->getDeclName() << NewTy << OldTy; 5912 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5913 5914 return true; 5915 } 5916 5917 // C++ [class.virtual]p6: 5918 // If the return type of D::f differs from the return type of B::f, the 5919 // class type in the return type of D::f shall be complete at the point of 5920 // declaration of D::f or shall be the class type D. 5921 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5922 if (!RT->isBeingDefined() && 5923 RequireCompleteType(New->getLocation(), NewClassTy, 5924 PDiag(diag::err_covariant_return_incomplete) 5925 << New->getDeclName())) 5926 return true; 5927 } 5928 5929 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5930 // Check if the new class derives from the old class. 5931 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5932 Diag(New->getLocation(), 5933 diag::err_covariant_return_not_derived) 5934 << New->getDeclName() << NewTy << OldTy; 5935 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5936 return true; 5937 } 5938 5939 // Check if we the conversion from derived to base is valid. 5940 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5941 diag::err_covariant_return_inaccessible_base, 5942 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5943 // FIXME: Should this point to the return type? 5944 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5945 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5946 return true; 5947 } 5948 } 5949 5950 // The qualifiers of the return types must be the same. 5951 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5952 Diag(New->getLocation(), 5953 diag::err_covariant_return_type_different_qualifications) 5954 << New->getDeclName() << NewTy << OldTy; 5955 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5956 return true; 5957 }; 5958 5959 5960 // The new class type must have the same or less qualifiers as the old type. 5961 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5962 Diag(New->getLocation(), 5963 diag::err_covariant_return_type_class_type_more_qualified) 5964 << New->getDeclName() << NewTy << OldTy; 5965 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5966 return true; 5967 }; 5968 5969 return false; 5970} 5971 5972bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5973 const CXXMethodDecl *Old) 5974{ 5975 if (Old->hasAttr<FinalAttr>()) { 5976 Diag(New->getLocation(), diag::err_final_function_overridden) 5977 << New->getDeclName(); 5978 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5979 return true; 5980 } 5981 5982 return false; 5983} 5984 5985/// \brief Mark the given method pure. 5986/// 5987/// \param Method the method to be marked pure. 5988/// 5989/// \param InitRange the source range that covers the "0" initializer. 5990bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5991 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5992 Method->setPure(); 5993 5994 // A class is abstract if at least one function is pure virtual. 5995 Method->getParent()->setAbstract(true); 5996 return false; 5997 } 5998 5999 if (!Method->isInvalidDecl()) 6000 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6001 << Method->getDeclName() << InitRange; 6002 return true; 6003} 6004 6005/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6006/// an initializer for the out-of-line declaration 'Dcl'. The scope 6007/// is a fresh scope pushed for just this purpose. 6008/// 6009/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6010/// static data member of class X, names should be looked up in the scope of 6011/// class X. 6012void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6013 // If there is no declaration, there was an error parsing it. 6014 Decl *D = Dcl.getAs<Decl>(); 6015 if (D == 0) return; 6016 6017 // We should only get called for declarations with scope specifiers, like: 6018 // int foo::bar; 6019 assert(D->isOutOfLine()); 6020 EnterDeclaratorContext(S, D->getDeclContext()); 6021} 6022 6023/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6024/// initializer for the out-of-line declaration 'Dcl'. 6025void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6026 // If there is no declaration, there was an error parsing it. 6027 Decl *D = Dcl.getAs<Decl>(); 6028 if (D == 0) return; 6029 6030 assert(D->isOutOfLine()); 6031 ExitDeclaratorContext(S); 6032} 6033 6034/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6035/// C++ if/switch/while/for statement. 6036/// e.g: "if (int x = f()) {...}" 6037Action::DeclResult 6038Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6039 // C++ 6.4p2: 6040 // The declarator shall not specify a function or an array. 6041 // The type-specifier-seq shall not contain typedef and shall not declare a 6042 // new class or enumeration. 6043 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6044 "Parser allowed 'typedef' as storage class of condition decl."); 6045 6046 TypeSourceInfo *TInfo = 0; 6047 TagDecl *OwnedTag = 0; 6048 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 6049 6050 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6051 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6052 // would be created and CXXConditionDeclExpr wants a VarDecl. 6053 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6054 << D.getSourceRange(); 6055 return DeclResult(); 6056 } else if (OwnedTag && OwnedTag->isDefinition()) { 6057 // The type-specifier-seq shall not declare a new class or enumeration. 6058 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6059 } 6060 6061 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6062 if (!Dcl) 6063 return DeclResult(); 6064 6065 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6066 VD->setDeclaredInCondition(true); 6067 return Dcl; 6068} 6069 6070void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6071 bool DefinitionRequired) { 6072 // Ignore any vtable uses in unevaluated operands or for classes that do 6073 // not have a vtable. 6074 if (!Class->isDynamicClass() || Class->isDependentContext() || 6075 CurContext->isDependentContext() || 6076 ExprEvalContexts.back().Context == Unevaluated) 6077 return; 6078 6079 // Try to insert this class into the map. 6080 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6081 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6082 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6083 if (!Pos.second) { 6084 Pos.first->second = Pos.first->second || DefinitionRequired; 6085 return; 6086 } 6087 6088 // Local classes need to have their virtual members marked 6089 // immediately. For all other classes, we mark their virtual members 6090 // at the end of the translation unit. 6091 if (Class->isLocalClass()) 6092 MarkVirtualMembersReferenced(Loc, Class); 6093 else 6094 VTableUses.push_back(std::make_pair(Class, Loc)); 6095} 6096 6097bool Sema::DefineUsedVTables() { 6098 // If any dynamic classes have their key function defined within 6099 // this translation unit, then those vtables are considered "used" and must 6100 // be emitted. 6101 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6102 if (const CXXMethodDecl *KeyFunction 6103 = Context.getKeyFunction(DynamicClasses[I])) { 6104 const FunctionDecl *Definition = 0; 6105 if (KeyFunction->getBody(Definition)) 6106 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6107 } 6108 } 6109 6110 if (VTableUses.empty()) 6111 return false; 6112 6113 // Note: The VTableUses vector could grow as a result of marking 6114 // the members of a class as "used", so we check the size each 6115 // time through the loop and prefer indices (with are stable) to 6116 // iterators (which are not). 6117 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6118 CXXRecordDecl *Class 6119 = cast_or_null<CXXRecordDecl>(VTableUses[I].first)->getDefinition(); 6120 if (!Class) 6121 continue; 6122 6123 SourceLocation Loc = VTableUses[I].second; 6124 6125 // If this class has a key function, but that key function is 6126 // defined in another translation unit, we don't need to emit the 6127 // vtable even though we're using it. 6128 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6129 if (KeyFunction && !KeyFunction->getBody()) { 6130 switch (KeyFunction->getTemplateSpecializationKind()) { 6131 case TSK_Undeclared: 6132 case TSK_ExplicitSpecialization: 6133 case TSK_ExplicitInstantiationDeclaration: 6134 // The key function is in another translation unit. 6135 continue; 6136 6137 case TSK_ExplicitInstantiationDefinition: 6138 case TSK_ImplicitInstantiation: 6139 // We will be instantiating the key function. 6140 break; 6141 } 6142 } else if (!KeyFunction) { 6143 // If we have a class with no key function that is the subject 6144 // of an explicit instantiation declaration, suppress the 6145 // vtable; it will live with the explicit instantiation 6146 // definition. 6147 bool IsExplicitInstantiationDeclaration 6148 = Class->getTemplateSpecializationKind() 6149 == TSK_ExplicitInstantiationDeclaration; 6150 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6151 REnd = Class->redecls_end(); 6152 R != REnd; ++R) { 6153 TemplateSpecializationKind TSK 6154 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6155 if (TSK == TSK_ExplicitInstantiationDeclaration) 6156 IsExplicitInstantiationDeclaration = true; 6157 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6158 IsExplicitInstantiationDeclaration = false; 6159 break; 6160 } 6161 } 6162 6163 if (IsExplicitInstantiationDeclaration) 6164 continue; 6165 } 6166 6167 // Mark all of the virtual members of this class as referenced, so 6168 // that we can build a vtable. Then, tell the AST consumer that a 6169 // vtable for this class is required. 6170 MarkVirtualMembersReferenced(Loc, Class); 6171 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6172 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6173 6174 // Optionally warn if we're emitting a weak vtable. 6175 if (Class->getLinkage() == ExternalLinkage && 6176 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6177 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6178 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6179 } 6180 } 6181 VTableUses.clear(); 6182 6183 return true; 6184} 6185 6186void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6187 const CXXRecordDecl *RD) { 6188 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6189 e = RD->method_end(); i != e; ++i) { 6190 CXXMethodDecl *MD = *i; 6191 6192 // C++ [basic.def.odr]p2: 6193 // [...] A virtual member function is used if it is not pure. [...] 6194 if (MD->isVirtual() && !MD->isPure()) 6195 MarkDeclarationReferenced(Loc, MD); 6196 } 6197 6198 // Only classes that have virtual bases need a VTT. 6199 if (RD->getNumVBases() == 0) 6200 return; 6201 6202 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6203 e = RD->bases_end(); i != e; ++i) { 6204 const CXXRecordDecl *Base = 6205 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6206 if (i->isVirtual()) 6207 continue; 6208 if (Base->getNumVBases() == 0) 6209 continue; 6210 MarkVirtualMembersReferenced(Loc, Base); 6211 } 6212} 6213 6214/// SetIvarInitializers - This routine builds initialization ASTs for the 6215/// Objective-C implementation whose ivars need be initialized. 6216void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6217 if (!getLangOptions().CPlusPlus) 6218 return; 6219 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6220 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6221 CollectIvarsToConstructOrDestruct(OID, ivars); 6222 if (ivars.empty()) 6223 return; 6224 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6225 for (unsigned i = 0; i < ivars.size(); i++) { 6226 FieldDecl *Field = ivars[i]; 6227 if (Field->isInvalidDecl()) 6228 continue; 6229 6230 CXXBaseOrMemberInitializer *Member; 6231 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6232 InitializationKind InitKind = 6233 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6234 6235 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6236 Sema::OwningExprResult MemberInit = 6237 InitSeq.Perform(*this, InitEntity, InitKind, 6238 Sema::MultiExprArg(*this, 0, 0)); 6239 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6240 // Note, MemberInit could actually come back empty if no initialization 6241 // is required (e.g., because it would call a trivial default constructor) 6242 if (!MemberInit.get() || MemberInit.isInvalid()) 6243 continue; 6244 6245 Member = 6246 new (Context) CXXBaseOrMemberInitializer(Context, 6247 Field, SourceLocation(), 6248 SourceLocation(), 6249 MemberInit.takeAs<Expr>(), 6250 SourceLocation()); 6251 AllToInit.push_back(Member); 6252 6253 // Be sure that the destructor is accessible and is marked as referenced. 6254 if (const RecordType *RecordTy 6255 = Context.getBaseElementType(Field->getType()) 6256 ->getAs<RecordType>()) { 6257 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6258 if (CXXDestructorDecl *Destructor 6259 = const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) { 6260 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6261 CheckDestructorAccess(Field->getLocation(), Destructor, 6262 PDiag(diag::err_access_dtor_ivar) 6263 << Context.getBaseElementType(Field->getType())); 6264 } 6265 } 6266 } 6267 ObjCImplementation->setIvarInitializers(Context, 6268 AllToInit.data(), AllToInit.size()); 6269 } 6270} 6271