SemaDeclCXX.cpp revision a0af3b453160fc4c67363c204da13820b0586909
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 if (!Class->hasObjectMember()) { 626 if (const RecordType *FDTTy = 627 NewBaseType.getTypePtr()->getAs<RecordType>()) 628 if (FDTTy->getDecl()->hasObjectMember()) 629 Class->setHasObjectMember(true); 630 } 631 632 if (KnownBaseTypes[NewBaseType]) { 633 // C++ [class.mi]p3: 634 // A class shall not be specified as a direct base class of a 635 // derived class more than once. 636 Diag(Bases[idx]->getSourceRange().getBegin(), 637 diag::err_duplicate_base_class) 638 << KnownBaseTypes[NewBaseType]->getType() 639 << Bases[idx]->getSourceRange(); 640 641 // Delete the duplicate base class specifier; we're going to 642 // overwrite its pointer later. 643 Context.Deallocate(Bases[idx]); 644 645 Invalid = true; 646 } else { 647 // Okay, add this new base class. 648 KnownBaseTypes[NewBaseType] = Bases[idx]; 649 Bases[NumGoodBases++] = Bases[idx]; 650 } 651 } 652 653 // Attach the remaining base class specifiers to the derived class. 654 Class->setBases(Bases, NumGoodBases); 655 656 // Delete the remaining (good) base class specifiers, since their 657 // data has been copied into the CXXRecordDecl. 658 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 659 Context.Deallocate(Bases[idx]); 660 661 return Invalid; 662} 663 664/// ActOnBaseSpecifiers - Attach the given base specifiers to the 665/// class, after checking whether there are any duplicate base 666/// classes. 667void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 668 unsigned NumBases) { 669 if (!ClassDecl || !Bases || !NumBases) 670 return; 671 672 AdjustDeclIfTemplate(ClassDecl); 673 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 674 (CXXBaseSpecifier**)(Bases), NumBases); 675} 676 677static CXXRecordDecl *GetClassForType(QualType T) { 678 if (const RecordType *RT = T->getAs<RecordType>()) 679 return cast<CXXRecordDecl>(RT->getDecl()); 680 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 681 return ICT->getDecl(); 682 else 683 return 0; 684} 685 686/// \brief Determine whether the type \p Derived is a C++ class that is 687/// derived from the type \p Base. 688bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 689 if (!getLangOptions().CPlusPlus) 690 return false; 691 692 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 693 if (!DerivedRD) 694 return false; 695 696 CXXRecordDecl *BaseRD = GetClassForType(Base); 697 if (!BaseRD) 698 return false; 699 700 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 701 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 702} 703 704/// \brief Determine whether the type \p Derived is a C++ class that is 705/// derived from the type \p Base. 706bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 707 if (!getLangOptions().CPlusPlus) 708 return false; 709 710 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 711 if (!DerivedRD) 712 return false; 713 714 CXXRecordDecl *BaseRD = GetClassForType(Base); 715 if (!BaseRD) 716 return false; 717 718 return DerivedRD->isDerivedFrom(BaseRD, Paths); 719} 720 721void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 722 CXXBaseSpecifierArray &BasePathArray) { 723 assert(BasePathArray.empty() && "Base path array must be empty!"); 724 assert(Paths.isRecordingPaths() && "Must record paths!"); 725 726 const CXXBasePath &Path = Paths.front(); 727 728 // We first go backward and check if we have a virtual base. 729 // FIXME: It would be better if CXXBasePath had the base specifier for 730 // the nearest virtual base. 731 unsigned Start = 0; 732 for (unsigned I = Path.size(); I != 0; --I) { 733 if (Path[I - 1].Base->isVirtual()) { 734 Start = I - 1; 735 break; 736 } 737 } 738 739 // Now add all bases. 740 for (unsigned I = Start, E = Path.size(); I != E; ++I) 741 BasePathArray.push_back(Path[I].Base); 742} 743 744/// \brief Determine whether the given base path includes a virtual 745/// base class. 746bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 747 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 748 BEnd = BasePath.end(); 749 B != BEnd; ++B) 750 if ((*B)->isVirtual()) 751 return true; 752 753 return false; 754} 755 756/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 757/// conversion (where Derived and Base are class types) is 758/// well-formed, meaning that the conversion is unambiguous (and 759/// that all of the base classes are accessible). Returns true 760/// and emits a diagnostic if the code is ill-formed, returns false 761/// otherwise. Loc is the location where this routine should point to 762/// if there is an error, and Range is the source range to highlight 763/// if there is an error. 764bool 765Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 766 unsigned InaccessibleBaseID, 767 unsigned AmbigiousBaseConvID, 768 SourceLocation Loc, SourceRange Range, 769 DeclarationName Name, 770 CXXBaseSpecifierArray *BasePath) { 771 // First, determine whether the path from Derived to Base is 772 // ambiguous. This is slightly more expensive than checking whether 773 // the Derived to Base conversion exists, because here we need to 774 // explore multiple paths to determine if there is an ambiguity. 775 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 776 /*DetectVirtual=*/false); 777 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 778 assert(DerivationOkay && 779 "Can only be used with a derived-to-base conversion"); 780 (void)DerivationOkay; 781 782 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 783 if (InaccessibleBaseID) { 784 // Check that the base class can be accessed. 785 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 786 InaccessibleBaseID)) { 787 case AR_inaccessible: 788 return true; 789 case AR_accessible: 790 case AR_dependent: 791 case AR_delayed: 792 break; 793 } 794 } 795 796 // Build a base path if necessary. 797 if (BasePath) 798 BuildBasePathArray(Paths, *BasePath); 799 return false; 800 } 801 802 // We know that the derived-to-base conversion is ambiguous, and 803 // we're going to produce a diagnostic. Perform the derived-to-base 804 // search just one more time to compute all of the possible paths so 805 // that we can print them out. This is more expensive than any of 806 // the previous derived-to-base checks we've done, but at this point 807 // performance isn't as much of an issue. 808 Paths.clear(); 809 Paths.setRecordingPaths(true); 810 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 811 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 812 (void)StillOkay; 813 814 // Build up a textual representation of the ambiguous paths, e.g., 815 // D -> B -> A, that will be used to illustrate the ambiguous 816 // conversions in the diagnostic. We only print one of the paths 817 // to each base class subobject. 818 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 819 820 Diag(Loc, AmbigiousBaseConvID) 821 << Derived << Base << PathDisplayStr << Range << Name; 822 return true; 823} 824 825bool 826Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 827 SourceLocation Loc, SourceRange Range, 828 CXXBaseSpecifierArray *BasePath, 829 bool IgnoreAccess) { 830 return CheckDerivedToBaseConversion(Derived, Base, 831 IgnoreAccess ? 0 832 : diag::err_upcast_to_inaccessible_base, 833 diag::err_ambiguous_derived_to_base_conv, 834 Loc, Range, DeclarationName(), 835 BasePath); 836} 837 838 839/// @brief Builds a string representing ambiguous paths from a 840/// specific derived class to different subobjects of the same base 841/// class. 842/// 843/// This function builds a string that can be used in error messages 844/// to show the different paths that one can take through the 845/// inheritance hierarchy to go from the derived class to different 846/// subobjects of a base class. The result looks something like this: 847/// @code 848/// struct D -> struct B -> struct A 849/// struct D -> struct C -> struct A 850/// @endcode 851std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 852 std::string PathDisplayStr; 853 std::set<unsigned> DisplayedPaths; 854 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 855 Path != Paths.end(); ++Path) { 856 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 857 // We haven't displayed a path to this particular base 858 // class subobject yet. 859 PathDisplayStr += "\n "; 860 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 861 for (CXXBasePath::const_iterator Element = Path->begin(); 862 Element != Path->end(); ++Element) 863 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 864 } 865 } 866 867 return PathDisplayStr; 868} 869 870//===----------------------------------------------------------------------===// 871// C++ class member Handling 872//===----------------------------------------------------------------------===// 873 874/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 875/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 876/// bitfield width if there is one and 'InitExpr' specifies the initializer if 877/// any. 878Sema::DeclPtrTy 879Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 880 MultiTemplateParamsArg TemplateParameterLists, 881 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 882 bool Deleted) { 883 const DeclSpec &DS = D.getDeclSpec(); 884 DeclarationName Name = GetNameForDeclarator(D); 885 Expr *BitWidth = static_cast<Expr*>(BW); 886 Expr *Init = static_cast<Expr*>(InitExpr); 887 SourceLocation Loc = D.getIdentifierLoc(); 888 889 bool isFunc = D.isFunctionDeclarator(); 890 891 assert(!DS.isFriendSpecified()); 892 893 // C++ 9.2p6: A member shall not be declared to have automatic storage 894 // duration (auto, register) or with the extern storage-class-specifier. 895 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 896 // data members and cannot be applied to names declared const or static, 897 // and cannot be applied to reference members. 898 switch (DS.getStorageClassSpec()) { 899 case DeclSpec::SCS_unspecified: 900 case DeclSpec::SCS_typedef: 901 case DeclSpec::SCS_static: 902 // FALL THROUGH. 903 break; 904 case DeclSpec::SCS_mutable: 905 if (isFunc) { 906 if (DS.getStorageClassSpecLoc().isValid()) 907 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 908 else 909 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 910 911 // FIXME: It would be nicer if the keyword was ignored only for this 912 // declarator. Otherwise we could get follow-up errors. 913 D.getMutableDeclSpec().ClearStorageClassSpecs(); 914 } else { 915 QualType T = GetTypeForDeclarator(D, S); 916 diag::kind err = static_cast<diag::kind>(0); 917 if (T->isReferenceType()) 918 err = diag::err_mutable_reference; 919 else if (T.isConstQualified()) 920 err = diag::err_mutable_const; 921 if (err != 0) { 922 if (DS.getStorageClassSpecLoc().isValid()) 923 Diag(DS.getStorageClassSpecLoc(), err); 924 else 925 Diag(DS.getThreadSpecLoc(), err); 926 // FIXME: It would be nicer if the keyword was ignored only for this 927 // declarator. Otherwise we could get follow-up errors. 928 D.getMutableDeclSpec().ClearStorageClassSpecs(); 929 } 930 } 931 break; 932 default: 933 if (DS.getStorageClassSpecLoc().isValid()) 934 Diag(DS.getStorageClassSpecLoc(), 935 diag::err_storageclass_invalid_for_member); 936 else 937 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 938 D.getMutableDeclSpec().ClearStorageClassSpecs(); 939 } 940 941 if (!isFunc && 942 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 943 D.getNumTypeObjects() == 0) { 944 // Check also for this case: 945 // 946 // typedef int f(); 947 // f a; 948 // 949 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 950 isFunc = TDType->isFunctionType(); 951 } 952 953 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 954 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 955 !isFunc); 956 957 Decl *Member; 958 if (isInstField) { 959 // FIXME: Check for template parameters! 960 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 961 AS); 962 assert(Member && "HandleField never returns null"); 963 } else { 964 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 965 .getAs<Decl>(); 966 if (!Member) { 967 if (BitWidth) DeleteExpr(BitWidth); 968 return DeclPtrTy(); 969 } 970 971 // Non-instance-fields can't have a bitfield. 972 if (BitWidth) { 973 if (Member->isInvalidDecl()) { 974 // don't emit another diagnostic. 975 } else if (isa<VarDecl>(Member)) { 976 // C++ 9.6p3: A bit-field shall not be a static member. 977 // "static member 'A' cannot be a bit-field" 978 Diag(Loc, diag::err_static_not_bitfield) 979 << Name << BitWidth->getSourceRange(); 980 } else if (isa<TypedefDecl>(Member)) { 981 // "typedef member 'x' cannot be a bit-field" 982 Diag(Loc, diag::err_typedef_not_bitfield) 983 << Name << BitWidth->getSourceRange(); 984 } else { 985 // A function typedef ("typedef int f(); f a;"). 986 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 987 Diag(Loc, diag::err_not_integral_type_bitfield) 988 << Name << cast<ValueDecl>(Member)->getType() 989 << BitWidth->getSourceRange(); 990 } 991 992 DeleteExpr(BitWidth); 993 BitWidth = 0; 994 Member->setInvalidDecl(); 995 } 996 997 Member->setAccess(AS); 998 999 // If we have declared a member function template, set the access of the 1000 // templated declaration as well. 1001 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1002 FunTmpl->getTemplatedDecl()->setAccess(AS); 1003 } 1004 1005 assert((Name || isInstField) && "No identifier for non-field ?"); 1006 1007 if (Init) 1008 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1009 if (Deleted) // FIXME: Source location is not very good. 1010 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1011 1012 if (isInstField) { 1013 FieldCollector->Add(cast<FieldDecl>(Member)); 1014 return DeclPtrTy(); 1015 } 1016 return DeclPtrTy::make(Member); 1017} 1018 1019/// \brief Find the direct and/or virtual base specifiers that 1020/// correspond to the given base type, for use in base initialization 1021/// within a constructor. 1022static bool FindBaseInitializer(Sema &SemaRef, 1023 CXXRecordDecl *ClassDecl, 1024 QualType BaseType, 1025 const CXXBaseSpecifier *&DirectBaseSpec, 1026 const CXXBaseSpecifier *&VirtualBaseSpec) { 1027 // First, check for a direct base class. 1028 DirectBaseSpec = 0; 1029 for (CXXRecordDecl::base_class_const_iterator Base 1030 = ClassDecl->bases_begin(); 1031 Base != ClassDecl->bases_end(); ++Base) { 1032 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1033 // We found a direct base of this type. That's what we're 1034 // initializing. 1035 DirectBaseSpec = &*Base; 1036 break; 1037 } 1038 } 1039 1040 // Check for a virtual base class. 1041 // FIXME: We might be able to short-circuit this if we know in advance that 1042 // there are no virtual bases. 1043 VirtualBaseSpec = 0; 1044 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1045 // We haven't found a base yet; search the class hierarchy for a 1046 // virtual base class. 1047 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1048 /*DetectVirtual=*/false); 1049 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1050 BaseType, Paths)) { 1051 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1052 Path != Paths.end(); ++Path) { 1053 if (Path->back().Base->isVirtual()) { 1054 VirtualBaseSpec = Path->back().Base; 1055 break; 1056 } 1057 } 1058 } 1059 } 1060 1061 return DirectBaseSpec || VirtualBaseSpec; 1062} 1063 1064/// ActOnMemInitializer - Handle a C++ member initializer. 1065Sema::MemInitResult 1066Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1067 Scope *S, 1068 CXXScopeSpec &SS, 1069 IdentifierInfo *MemberOrBase, 1070 TypeTy *TemplateTypeTy, 1071 SourceLocation IdLoc, 1072 SourceLocation LParenLoc, 1073 ExprTy **Args, unsigned NumArgs, 1074 SourceLocation *CommaLocs, 1075 SourceLocation RParenLoc) { 1076 if (!ConstructorD) 1077 return true; 1078 1079 AdjustDeclIfTemplate(ConstructorD); 1080 1081 CXXConstructorDecl *Constructor 1082 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1083 if (!Constructor) { 1084 // The user wrote a constructor initializer on a function that is 1085 // not a C++ constructor. Ignore the error for now, because we may 1086 // have more member initializers coming; we'll diagnose it just 1087 // once in ActOnMemInitializers. 1088 return true; 1089 } 1090 1091 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1092 1093 // C++ [class.base.init]p2: 1094 // Names in a mem-initializer-id are looked up in the scope of the 1095 // constructor’s class and, if not found in that scope, are looked 1096 // up in the scope containing the constructor’s 1097 // definition. [Note: if the constructor’s class contains a member 1098 // with the same name as a direct or virtual base class of the 1099 // class, a mem-initializer-id naming the member or base class and 1100 // composed of a single identifier refers to the class member. A 1101 // mem-initializer-id for the hidden base class may be specified 1102 // using a qualified name. ] 1103 if (!SS.getScopeRep() && !TemplateTypeTy) { 1104 // Look for a member, first. 1105 FieldDecl *Member = 0; 1106 DeclContext::lookup_result Result 1107 = ClassDecl->lookup(MemberOrBase); 1108 if (Result.first != Result.second) 1109 Member = dyn_cast<FieldDecl>(*Result.first); 1110 1111 // FIXME: Handle members of an anonymous union. 1112 1113 if (Member) 1114 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1115 LParenLoc, RParenLoc); 1116 } 1117 // It didn't name a member, so see if it names a class. 1118 QualType BaseType; 1119 TypeSourceInfo *TInfo = 0; 1120 1121 if (TemplateTypeTy) { 1122 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1123 } else { 1124 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1125 LookupParsedName(R, S, &SS); 1126 1127 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1128 if (!TyD) { 1129 if (R.isAmbiguous()) return true; 1130 1131 // We don't want access-control diagnostics here. 1132 R.suppressDiagnostics(); 1133 1134 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1135 bool NotUnknownSpecialization = false; 1136 DeclContext *DC = computeDeclContext(SS, false); 1137 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1138 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1139 1140 if (!NotUnknownSpecialization) { 1141 // When the scope specifier can refer to a member of an unknown 1142 // specialization, we take it as a type name. 1143 BaseType = CheckTypenameType(ETK_None, 1144 (NestedNameSpecifier *)SS.getScopeRep(), 1145 *MemberOrBase, SourceLocation(), 1146 SS.getRange(), IdLoc); 1147 if (BaseType.isNull()) 1148 return true; 1149 1150 R.clear(); 1151 } 1152 } 1153 1154 // If no results were found, try to correct typos. 1155 if (R.empty() && BaseType.isNull() && 1156 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1157 R.isSingleResult()) { 1158 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1159 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1160 // We have found a non-static data member with a similar 1161 // name to what was typed; complain and initialize that 1162 // member. 1163 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1164 << MemberOrBase << true << R.getLookupName() 1165 << FixItHint::CreateReplacement(R.getNameLoc(), 1166 R.getLookupName().getAsString()); 1167 Diag(Member->getLocation(), diag::note_previous_decl) 1168 << Member->getDeclName(); 1169 1170 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1171 LParenLoc, RParenLoc); 1172 } 1173 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1174 const CXXBaseSpecifier *DirectBaseSpec; 1175 const CXXBaseSpecifier *VirtualBaseSpec; 1176 if (FindBaseInitializer(*this, ClassDecl, 1177 Context.getTypeDeclType(Type), 1178 DirectBaseSpec, VirtualBaseSpec)) { 1179 // We have found a direct or virtual base class with a 1180 // similar name to what was typed; complain and initialize 1181 // that base class. 1182 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1183 << MemberOrBase << false << R.getLookupName() 1184 << FixItHint::CreateReplacement(R.getNameLoc(), 1185 R.getLookupName().getAsString()); 1186 1187 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1188 : VirtualBaseSpec; 1189 Diag(BaseSpec->getSourceRange().getBegin(), 1190 diag::note_base_class_specified_here) 1191 << BaseSpec->getType() 1192 << BaseSpec->getSourceRange(); 1193 1194 TyD = Type; 1195 } 1196 } 1197 } 1198 1199 if (!TyD && BaseType.isNull()) { 1200 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1201 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1202 return true; 1203 } 1204 } 1205 1206 if (BaseType.isNull()) { 1207 BaseType = Context.getTypeDeclType(TyD); 1208 if (SS.isSet()) { 1209 NestedNameSpecifier *Qualifier = 1210 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1211 1212 // FIXME: preserve source range information 1213 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1214 } 1215 } 1216 } 1217 1218 if (!TInfo) 1219 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1220 1221 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1222 LParenLoc, RParenLoc, ClassDecl); 1223} 1224 1225/// Checks an initializer expression for use of uninitialized fields, such as 1226/// containing the field that is being initialized. Returns true if there is an 1227/// uninitialized field was used an updates the SourceLocation parameter; false 1228/// otherwise. 1229static bool InitExprContainsUninitializedFields(const Stmt* S, 1230 const FieldDecl* LhsField, 1231 SourceLocation* L) { 1232 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1233 if (ME) { 1234 const NamedDecl* RhsField = ME->getMemberDecl(); 1235 if (RhsField == LhsField) { 1236 // Initializing a field with itself. Throw a warning. 1237 // But wait; there are exceptions! 1238 // Exception #1: The field may not belong to this record. 1239 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1240 const Expr* base = ME->getBase(); 1241 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1242 // Even though the field matches, it does not belong to this record. 1243 return false; 1244 } 1245 // None of the exceptions triggered; return true to indicate an 1246 // uninitialized field was used. 1247 *L = ME->getMemberLoc(); 1248 return true; 1249 } 1250 } 1251 bool found = false; 1252 for (Stmt::const_child_iterator it = S->child_begin(); 1253 it != S->child_end() && found == false; 1254 ++it) { 1255 if (isa<CallExpr>(S)) { 1256 // Do not descend into function calls or constructors, as the use 1257 // of an uninitialized field may be valid. One would have to inspect 1258 // the contents of the function/ctor to determine if it is safe or not. 1259 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1260 // may be safe, depending on what the function/ctor does. 1261 continue; 1262 } 1263 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1264 } 1265 return found; 1266} 1267 1268Sema::MemInitResult 1269Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1270 unsigned NumArgs, SourceLocation IdLoc, 1271 SourceLocation LParenLoc, 1272 SourceLocation RParenLoc) { 1273 // Diagnose value-uses of fields to initialize themselves, e.g. 1274 // foo(foo) 1275 // where foo is not also a parameter to the constructor. 1276 // TODO: implement -Wuninitialized and fold this into that framework. 1277 for (unsigned i = 0; i < NumArgs; ++i) { 1278 SourceLocation L; 1279 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1280 // FIXME: Return true in the case when other fields are used before being 1281 // uninitialized. For example, let this field be the i'th field. When 1282 // initializing the i'th field, throw a warning if any of the >= i'th 1283 // fields are used, as they are not yet initialized. 1284 // Right now we are only handling the case where the i'th field uses 1285 // itself in its initializer. 1286 Diag(L, diag::warn_field_is_uninit); 1287 } 1288 } 1289 1290 bool HasDependentArg = false; 1291 for (unsigned i = 0; i < NumArgs; i++) 1292 HasDependentArg |= Args[i]->isTypeDependent(); 1293 1294 QualType FieldType = Member->getType(); 1295 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1296 FieldType = Array->getElementType(); 1297 if (FieldType->isDependentType() || HasDependentArg) { 1298 // Can't check initialization for a member of dependent type or when 1299 // any of the arguments are type-dependent expressions. 1300 OwningExprResult Init 1301 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1302 RParenLoc)); 1303 1304 // Erase any temporaries within this evaluation context; we're not 1305 // going to track them in the AST, since we'll be rebuilding the 1306 // ASTs during template instantiation. 1307 ExprTemporaries.erase( 1308 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1309 ExprTemporaries.end()); 1310 1311 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1312 LParenLoc, 1313 Init.takeAs<Expr>(), 1314 RParenLoc); 1315 1316 } 1317 1318 if (Member->isInvalidDecl()) 1319 return true; 1320 1321 // Initialize the member. 1322 InitializedEntity MemberEntity = 1323 InitializedEntity::InitializeMember(Member, 0); 1324 InitializationKind Kind = 1325 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1326 1327 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1328 1329 OwningExprResult MemberInit = 1330 InitSeq.Perform(*this, MemberEntity, Kind, 1331 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1332 if (MemberInit.isInvalid()) 1333 return true; 1334 1335 // C++0x [class.base.init]p7: 1336 // The initialization of each base and member constitutes a 1337 // full-expression. 1338 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1339 if (MemberInit.isInvalid()) 1340 return true; 1341 1342 // If we are in a dependent context, template instantiation will 1343 // perform this type-checking again. Just save the arguments that we 1344 // received in a ParenListExpr. 1345 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1346 // of the information that we have about the member 1347 // initializer. However, deconstructing the ASTs is a dicey process, 1348 // and this approach is far more likely to get the corner cases right. 1349 if (CurContext->isDependentContext()) { 1350 // Bump the reference count of all of the arguments. 1351 for (unsigned I = 0; I != NumArgs; ++I) 1352 Args[I]->Retain(); 1353 1354 OwningExprResult Init 1355 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1356 RParenLoc)); 1357 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1358 LParenLoc, 1359 Init.takeAs<Expr>(), 1360 RParenLoc); 1361 } 1362 1363 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1364 LParenLoc, 1365 MemberInit.takeAs<Expr>(), 1366 RParenLoc); 1367} 1368 1369Sema::MemInitResult 1370Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1371 Expr **Args, unsigned NumArgs, 1372 SourceLocation LParenLoc, SourceLocation RParenLoc, 1373 CXXRecordDecl *ClassDecl) { 1374 bool HasDependentArg = false; 1375 for (unsigned i = 0; i < NumArgs; i++) 1376 HasDependentArg |= Args[i]->isTypeDependent(); 1377 1378 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1379 if (BaseType->isDependentType() || HasDependentArg) { 1380 // Can't check initialization for a base of dependent type or when 1381 // any of the arguments are type-dependent expressions. 1382 OwningExprResult BaseInit 1383 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1384 RParenLoc)); 1385 1386 // Erase any temporaries within this evaluation context; we're not 1387 // going to track them in the AST, since we'll be rebuilding the 1388 // ASTs during template instantiation. 1389 ExprTemporaries.erase( 1390 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1391 ExprTemporaries.end()); 1392 1393 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1394 /*IsVirtual=*/false, 1395 LParenLoc, 1396 BaseInit.takeAs<Expr>(), 1397 RParenLoc); 1398 } 1399 1400 if (!BaseType->isRecordType()) 1401 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1402 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1403 1404 // C++ [class.base.init]p2: 1405 // [...] Unless the mem-initializer-id names a nonstatic data 1406 // member of the constructor’s class or a direct or virtual base 1407 // of that class, the mem-initializer is ill-formed. A 1408 // mem-initializer-list can initialize a base class using any 1409 // name that denotes that base class type. 1410 1411 // Check for direct and virtual base classes. 1412 const CXXBaseSpecifier *DirectBaseSpec = 0; 1413 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1414 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1415 VirtualBaseSpec); 1416 1417 // C++ [base.class.init]p2: 1418 // If a mem-initializer-id is ambiguous because it designates both 1419 // a direct non-virtual base class and an inherited virtual base 1420 // class, the mem-initializer is ill-formed. 1421 if (DirectBaseSpec && VirtualBaseSpec) 1422 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1423 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1424 // C++ [base.class.init]p2: 1425 // Unless the mem-initializer-id names a nonstatic data membeer of the 1426 // constructor's class ot a direst or virtual base of that class, the 1427 // mem-initializer is ill-formed. 1428 if (!DirectBaseSpec && !VirtualBaseSpec) 1429 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1430 << BaseType << Context.getTypeDeclType(ClassDecl) 1431 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1432 1433 CXXBaseSpecifier *BaseSpec 1434 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1435 if (!BaseSpec) 1436 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1437 1438 // Initialize the base. 1439 InitializedEntity BaseEntity = 1440 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1441 InitializationKind Kind = 1442 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1443 1444 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1445 1446 OwningExprResult BaseInit = 1447 InitSeq.Perform(*this, BaseEntity, Kind, 1448 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1449 if (BaseInit.isInvalid()) 1450 return true; 1451 1452 // C++0x [class.base.init]p7: 1453 // The initialization of each base and member constitutes a 1454 // full-expression. 1455 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1456 if (BaseInit.isInvalid()) 1457 return true; 1458 1459 // If we are in a dependent context, template instantiation will 1460 // perform this type-checking again. Just save the arguments that we 1461 // received in a ParenListExpr. 1462 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1463 // of the information that we have about the base 1464 // initializer. However, deconstructing the ASTs is a dicey process, 1465 // and this approach is far more likely to get the corner cases right. 1466 if (CurContext->isDependentContext()) { 1467 // Bump the reference count of all of the arguments. 1468 for (unsigned I = 0; I != NumArgs; ++I) 1469 Args[I]->Retain(); 1470 1471 OwningExprResult Init 1472 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1473 RParenLoc)); 1474 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1475 BaseSpec->isVirtual(), 1476 LParenLoc, 1477 Init.takeAs<Expr>(), 1478 RParenLoc); 1479 } 1480 1481 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1482 BaseSpec->isVirtual(), 1483 LParenLoc, 1484 BaseInit.takeAs<Expr>(), 1485 RParenLoc); 1486} 1487 1488/// ImplicitInitializerKind - How an implicit base or member initializer should 1489/// initialize its base or member. 1490enum ImplicitInitializerKind { 1491 IIK_Default, 1492 IIK_Copy, 1493 IIK_Move 1494}; 1495 1496static bool 1497BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1498 ImplicitInitializerKind ImplicitInitKind, 1499 CXXBaseSpecifier *BaseSpec, 1500 bool IsInheritedVirtualBase, 1501 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1502 InitializedEntity InitEntity 1503 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1504 IsInheritedVirtualBase); 1505 1506 Sema::OwningExprResult BaseInit(SemaRef); 1507 1508 switch (ImplicitInitKind) { 1509 case IIK_Default: { 1510 InitializationKind InitKind 1511 = InitializationKind::CreateDefault(Constructor->getLocation()); 1512 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1513 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1514 Sema::MultiExprArg(SemaRef, 0, 0)); 1515 break; 1516 } 1517 1518 case IIK_Copy: { 1519 ParmVarDecl *Param = Constructor->getParamDecl(0); 1520 QualType ParamType = Param->getType().getNonReferenceType(); 1521 1522 Expr *CopyCtorArg = 1523 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1524 Constructor->getLocation(), ParamType, 0); 1525 1526 // Cast to the base class to avoid ambiguities. 1527 QualType ArgTy = 1528 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1529 ParamType.getQualifiers()); 1530 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1531 CastExpr::CK_UncheckedDerivedToBase, 1532 /*isLvalue=*/true, 1533 CXXBaseSpecifierArray(BaseSpec)); 1534 1535 InitializationKind InitKind 1536 = InitializationKind::CreateDirect(Constructor->getLocation(), 1537 SourceLocation(), SourceLocation()); 1538 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1539 &CopyCtorArg, 1); 1540 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1541 Sema::MultiExprArg(SemaRef, 1542 (void**)&CopyCtorArg, 1)); 1543 break; 1544 } 1545 1546 case IIK_Move: 1547 assert(false && "Unhandled initializer kind!"); 1548 } 1549 1550 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1551 if (BaseInit.isInvalid()) 1552 return true; 1553 1554 CXXBaseInit = 1555 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1556 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1557 SourceLocation()), 1558 BaseSpec->isVirtual(), 1559 SourceLocation(), 1560 BaseInit.takeAs<Expr>(), 1561 SourceLocation()); 1562 1563 return false; 1564} 1565 1566static bool 1567BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1568 ImplicitInitializerKind ImplicitInitKind, 1569 FieldDecl *Field, 1570 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1571 if (Field->isInvalidDecl()) 1572 return true; 1573 1574 if (ImplicitInitKind == IIK_Copy) { 1575 SourceLocation Loc = Constructor->getLocation(); 1576 ParmVarDecl *Param = Constructor->getParamDecl(0); 1577 QualType ParamType = Param->getType().getNonReferenceType(); 1578 1579 Expr *MemberExprBase = 1580 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1581 Loc, ParamType, 0); 1582 1583 // Build a reference to this field within the parameter. 1584 CXXScopeSpec SS; 1585 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1586 Sema::LookupMemberName); 1587 MemberLookup.addDecl(Field, AS_public); 1588 MemberLookup.resolveKind(); 1589 Sema::OwningExprResult CopyCtorArg 1590 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1591 ParamType, Loc, 1592 /*IsArrow=*/false, 1593 SS, 1594 /*FirstQualifierInScope=*/0, 1595 MemberLookup, 1596 /*TemplateArgs=*/0); 1597 if (CopyCtorArg.isInvalid()) 1598 return true; 1599 1600 // When the field we are copying is an array, create index variables for 1601 // each dimension of the array. We use these index variables to subscript 1602 // the source array, and other clients (e.g., CodeGen) will perform the 1603 // necessary iteration with these index variables. 1604 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1605 QualType BaseType = Field->getType(); 1606 QualType SizeType = SemaRef.Context.getSizeType(); 1607 while (const ConstantArrayType *Array 1608 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1609 // Create the iteration variable for this array index. 1610 IdentifierInfo *IterationVarName = 0; 1611 { 1612 llvm::SmallString<8> Str; 1613 llvm::raw_svector_ostream OS(Str); 1614 OS << "__i" << IndexVariables.size(); 1615 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1616 } 1617 VarDecl *IterationVar 1618 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1619 IterationVarName, SizeType, 1620 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1621 VarDecl::None, VarDecl::None); 1622 IndexVariables.push_back(IterationVar); 1623 1624 // Create a reference to the iteration variable. 1625 Sema::OwningExprResult IterationVarRef 1626 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1627 assert(!IterationVarRef.isInvalid() && 1628 "Reference to invented variable cannot fail!"); 1629 1630 // Subscript the array with this iteration variable. 1631 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1632 Loc, 1633 move(IterationVarRef), 1634 Loc); 1635 if (CopyCtorArg.isInvalid()) 1636 return true; 1637 1638 BaseType = Array->getElementType(); 1639 } 1640 1641 // Construct the entity that we will be initializing. For an array, this 1642 // will be first element in the array, which may require several levels 1643 // of array-subscript entities. 1644 llvm::SmallVector<InitializedEntity, 4> Entities; 1645 Entities.reserve(1 + IndexVariables.size()); 1646 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1647 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1648 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1649 0, 1650 Entities.back())); 1651 1652 // Direct-initialize to use the copy constructor. 1653 InitializationKind InitKind = 1654 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1655 1656 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1657 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1658 &CopyCtorArgE, 1); 1659 1660 Sema::OwningExprResult MemberInit 1661 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1662 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1663 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1664 if (MemberInit.isInvalid()) 1665 return true; 1666 1667 CXXMemberInit 1668 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1669 MemberInit.takeAs<Expr>(), Loc, 1670 IndexVariables.data(), 1671 IndexVariables.size()); 1672 return false; 1673 } 1674 1675 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1676 1677 QualType FieldBaseElementType = 1678 SemaRef.Context.getBaseElementType(Field->getType()); 1679 1680 if (FieldBaseElementType->isRecordType()) { 1681 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1682 InitializationKind InitKind = 1683 InitializationKind::CreateDefault(Constructor->getLocation()); 1684 1685 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1686 Sema::OwningExprResult MemberInit = 1687 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1688 Sema::MultiExprArg(SemaRef, 0, 0)); 1689 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1690 if (MemberInit.isInvalid()) 1691 return true; 1692 1693 CXXMemberInit = 1694 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1695 Field, SourceLocation(), 1696 SourceLocation(), 1697 MemberInit.takeAs<Expr>(), 1698 SourceLocation()); 1699 return false; 1700 } 1701 1702 if (FieldBaseElementType->isReferenceType()) { 1703 SemaRef.Diag(Constructor->getLocation(), 1704 diag::err_uninitialized_member_in_ctor) 1705 << (int)Constructor->isImplicit() 1706 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1707 << 0 << Field->getDeclName(); 1708 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1709 return true; 1710 } 1711 1712 if (FieldBaseElementType.isConstQualified()) { 1713 SemaRef.Diag(Constructor->getLocation(), 1714 diag::err_uninitialized_member_in_ctor) 1715 << (int)Constructor->isImplicit() 1716 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1717 << 1 << Field->getDeclName(); 1718 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1719 return true; 1720 } 1721 1722 // Nothing to initialize. 1723 CXXMemberInit = 0; 1724 return false; 1725} 1726 1727namespace { 1728struct BaseAndFieldInfo { 1729 Sema &S; 1730 CXXConstructorDecl *Ctor; 1731 bool AnyErrorsInInits; 1732 ImplicitInitializerKind IIK; 1733 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1734 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1735 1736 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1737 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1738 // FIXME: Handle implicit move constructors. 1739 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1740 IIK = IIK_Copy; 1741 else 1742 IIK = IIK_Default; 1743 } 1744}; 1745} 1746 1747static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1748 FieldDecl *Top, FieldDecl *Field) { 1749 1750 // Overwhelmingly common case: we have a direct initializer for this field. 1751 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1752 Info.AllToInit.push_back(Init); 1753 1754 if (Field != Top) { 1755 Init->setMember(Top); 1756 Init->setAnonUnionMember(Field); 1757 } 1758 return false; 1759 } 1760 1761 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1762 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1763 assert(FieldClassType && "anonymous struct/union without record type"); 1764 1765 // Walk through the members, tying in any initializers for fields 1766 // we find. The earlier semantic checks should prevent redundant 1767 // initialization of union members, given the requirement that 1768 // union members never have non-trivial default constructors. 1769 1770 // TODO: in C++0x, it might be legal to have union members with 1771 // non-trivial default constructors in unions. Revise this 1772 // implementation then with the appropriate semantics. 1773 CXXRecordDecl *FieldClassDecl 1774 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1775 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1776 EA = FieldClassDecl->field_end(); FA != EA; FA++) 1777 if (CollectFieldInitializer(Info, Top, *FA)) 1778 return true; 1779 } 1780 1781 // Don't try to build an implicit initializer if there were semantic 1782 // errors in any of the initializers (and therefore we might be 1783 // missing some that the user actually wrote). 1784 if (Info.AnyErrorsInInits) 1785 return false; 1786 1787 CXXBaseOrMemberInitializer *Init = 0; 1788 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1789 return true; 1790 1791 // If the member doesn't need to be initialized, Init will still be null. 1792 if (!Init) return false; 1793 1794 Info.AllToInit.push_back(Init); 1795 if (Top != Field) { 1796 Init->setMember(Top); 1797 Init->setAnonUnionMember(Field); 1798 } 1799 return false; 1800} 1801 1802bool 1803Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1804 CXXBaseOrMemberInitializer **Initializers, 1805 unsigned NumInitializers, 1806 bool AnyErrors) { 1807 if (Constructor->getDeclContext()->isDependentContext()) { 1808 // Just store the initializers as written, they will be checked during 1809 // instantiation. 1810 if (NumInitializers > 0) { 1811 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1812 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1813 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1814 memcpy(baseOrMemberInitializers, Initializers, 1815 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1816 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1817 } 1818 1819 return false; 1820 } 1821 1822 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1823 1824 // We need to build the initializer AST according to order of construction 1825 // and not what user specified in the Initializers list. 1826 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1827 if (!ClassDecl) 1828 return true; 1829 1830 bool HadError = false; 1831 1832 for (unsigned i = 0; i < NumInitializers; i++) { 1833 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1834 1835 if (Member->isBaseInitializer()) 1836 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1837 else 1838 Info.AllBaseFields[Member->getMember()] = Member; 1839 } 1840 1841 // Keep track of the direct virtual bases. 1842 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1843 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1844 E = ClassDecl->bases_end(); I != E; ++I) { 1845 if (I->isVirtual()) 1846 DirectVBases.insert(I); 1847 } 1848 1849 // Push virtual bases before others. 1850 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1851 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1852 1853 if (CXXBaseOrMemberInitializer *Value 1854 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1855 Info.AllToInit.push_back(Value); 1856 } else if (!AnyErrors) { 1857 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1858 CXXBaseOrMemberInitializer *CXXBaseInit; 1859 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1860 VBase, IsInheritedVirtualBase, 1861 CXXBaseInit)) { 1862 HadError = true; 1863 continue; 1864 } 1865 1866 Info.AllToInit.push_back(CXXBaseInit); 1867 } 1868 } 1869 1870 // Non-virtual bases. 1871 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1872 E = ClassDecl->bases_end(); Base != E; ++Base) { 1873 // Virtuals are in the virtual base list and already constructed. 1874 if (Base->isVirtual()) 1875 continue; 1876 1877 if (CXXBaseOrMemberInitializer *Value 1878 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1879 Info.AllToInit.push_back(Value); 1880 } else if (!AnyErrors) { 1881 CXXBaseOrMemberInitializer *CXXBaseInit; 1882 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1883 Base, /*IsInheritedVirtualBase=*/false, 1884 CXXBaseInit)) { 1885 HadError = true; 1886 continue; 1887 } 1888 1889 Info.AllToInit.push_back(CXXBaseInit); 1890 } 1891 } 1892 1893 // Fields. 1894 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1895 E = ClassDecl->field_end(); Field != E; ++Field) 1896 if (CollectFieldInitializer(Info, *Field, *Field)) 1897 HadError = true; 1898 1899 NumInitializers = Info.AllToInit.size(); 1900 if (NumInitializers > 0) { 1901 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1902 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1903 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1904 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1905 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1906 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1907 1908 // Constructors implicitly reference the base and member 1909 // destructors. 1910 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1911 Constructor->getParent()); 1912 } 1913 1914 return HadError; 1915} 1916 1917static void *GetKeyForTopLevelField(FieldDecl *Field) { 1918 // For anonymous unions, use the class declaration as the key. 1919 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1920 if (RT->getDecl()->isAnonymousStructOrUnion()) 1921 return static_cast<void *>(RT->getDecl()); 1922 } 1923 return static_cast<void *>(Field); 1924} 1925 1926static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1927 return Context.getCanonicalType(BaseType).getTypePtr(); 1928} 1929 1930static void *GetKeyForMember(ASTContext &Context, 1931 CXXBaseOrMemberInitializer *Member, 1932 bool MemberMaybeAnon = false) { 1933 if (!Member->isMemberInitializer()) 1934 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1935 1936 // For fields injected into the class via declaration of an anonymous union, 1937 // use its anonymous union class declaration as the unique key. 1938 FieldDecl *Field = Member->getMember(); 1939 1940 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1941 // data member of the class. Data member used in the initializer list is 1942 // in AnonUnionMember field. 1943 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1944 Field = Member->getAnonUnionMember(); 1945 1946 // If the field is a member of an anonymous struct or union, our key 1947 // is the anonymous record decl that's a direct child of the class. 1948 RecordDecl *RD = Field->getParent(); 1949 if (RD->isAnonymousStructOrUnion()) { 1950 while (true) { 1951 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1952 if (Parent->isAnonymousStructOrUnion()) 1953 RD = Parent; 1954 else 1955 break; 1956 } 1957 1958 return static_cast<void *>(RD); 1959 } 1960 1961 return static_cast<void *>(Field); 1962} 1963 1964static void 1965DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1966 const CXXConstructorDecl *Constructor, 1967 CXXBaseOrMemberInitializer **Inits, 1968 unsigned NumInits) { 1969 if (Constructor->getDeclContext()->isDependentContext()) 1970 return; 1971 1972 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1973 == Diagnostic::Ignored) 1974 return; 1975 1976 // Build the list of bases and members in the order that they'll 1977 // actually be initialized. The explicit initializers should be in 1978 // this same order but may be missing things. 1979 llvm::SmallVector<const void*, 32> IdealInitKeys; 1980 1981 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1982 1983 // 1. Virtual bases. 1984 for (CXXRecordDecl::base_class_const_iterator VBase = 1985 ClassDecl->vbases_begin(), 1986 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1987 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1988 1989 // 2. Non-virtual bases. 1990 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1991 E = ClassDecl->bases_end(); Base != E; ++Base) { 1992 if (Base->isVirtual()) 1993 continue; 1994 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1995 } 1996 1997 // 3. Direct fields. 1998 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1999 E = ClassDecl->field_end(); Field != E; ++Field) 2000 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2001 2002 unsigned NumIdealInits = IdealInitKeys.size(); 2003 unsigned IdealIndex = 0; 2004 2005 CXXBaseOrMemberInitializer *PrevInit = 0; 2006 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2007 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2008 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2009 2010 // Scan forward to try to find this initializer in the idealized 2011 // initializers list. 2012 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2013 if (InitKey == IdealInitKeys[IdealIndex]) 2014 break; 2015 2016 // If we didn't find this initializer, it must be because we 2017 // scanned past it on a previous iteration. That can only 2018 // happen if we're out of order; emit a warning. 2019 if (IdealIndex == NumIdealInits && PrevInit) { 2020 Sema::SemaDiagnosticBuilder D = 2021 SemaRef.Diag(PrevInit->getSourceLocation(), 2022 diag::warn_initializer_out_of_order); 2023 2024 if (PrevInit->isMemberInitializer()) 2025 D << 0 << PrevInit->getMember()->getDeclName(); 2026 else 2027 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2028 2029 if (Init->isMemberInitializer()) 2030 D << 0 << Init->getMember()->getDeclName(); 2031 else 2032 D << 1 << Init->getBaseClassInfo()->getType(); 2033 2034 // Move back to the initializer's location in the ideal list. 2035 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2036 if (InitKey == IdealInitKeys[IdealIndex]) 2037 break; 2038 2039 assert(IdealIndex != NumIdealInits && 2040 "initializer not found in initializer list"); 2041 } 2042 2043 PrevInit = Init; 2044 } 2045} 2046 2047namespace { 2048bool CheckRedundantInit(Sema &S, 2049 CXXBaseOrMemberInitializer *Init, 2050 CXXBaseOrMemberInitializer *&PrevInit) { 2051 if (!PrevInit) { 2052 PrevInit = Init; 2053 return false; 2054 } 2055 2056 if (FieldDecl *Field = Init->getMember()) 2057 S.Diag(Init->getSourceLocation(), 2058 diag::err_multiple_mem_initialization) 2059 << Field->getDeclName() 2060 << Init->getSourceRange(); 2061 else { 2062 Type *BaseClass = Init->getBaseClass(); 2063 assert(BaseClass && "neither field nor base"); 2064 S.Diag(Init->getSourceLocation(), 2065 diag::err_multiple_base_initialization) 2066 << QualType(BaseClass, 0) 2067 << Init->getSourceRange(); 2068 } 2069 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2070 << 0 << PrevInit->getSourceRange(); 2071 2072 return true; 2073} 2074 2075typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2076typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2077 2078bool CheckRedundantUnionInit(Sema &S, 2079 CXXBaseOrMemberInitializer *Init, 2080 RedundantUnionMap &Unions) { 2081 FieldDecl *Field = Init->getMember(); 2082 RecordDecl *Parent = Field->getParent(); 2083 if (!Parent->isAnonymousStructOrUnion()) 2084 return false; 2085 2086 NamedDecl *Child = Field; 2087 do { 2088 if (Parent->isUnion()) { 2089 UnionEntry &En = Unions[Parent]; 2090 if (En.first && En.first != Child) { 2091 S.Diag(Init->getSourceLocation(), 2092 diag::err_multiple_mem_union_initialization) 2093 << Field->getDeclName() 2094 << Init->getSourceRange(); 2095 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2096 << 0 << En.second->getSourceRange(); 2097 return true; 2098 } else if (!En.first) { 2099 En.first = Child; 2100 En.second = Init; 2101 } 2102 } 2103 2104 Child = Parent; 2105 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2106 } while (Parent->isAnonymousStructOrUnion()); 2107 2108 return false; 2109} 2110} 2111 2112/// ActOnMemInitializers - Handle the member initializers for a constructor. 2113void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2114 SourceLocation ColonLoc, 2115 MemInitTy **meminits, unsigned NumMemInits, 2116 bool AnyErrors) { 2117 if (!ConstructorDecl) 2118 return; 2119 2120 AdjustDeclIfTemplate(ConstructorDecl); 2121 2122 CXXConstructorDecl *Constructor 2123 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2124 2125 if (!Constructor) { 2126 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2127 return; 2128 } 2129 2130 CXXBaseOrMemberInitializer **MemInits = 2131 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2132 2133 // Mapping for the duplicate initializers check. 2134 // For member initializers, this is keyed with a FieldDecl*. 2135 // For base initializers, this is keyed with a Type*. 2136 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2137 2138 // Mapping for the inconsistent anonymous-union initializers check. 2139 RedundantUnionMap MemberUnions; 2140 2141 bool HadError = false; 2142 for (unsigned i = 0; i < NumMemInits; i++) { 2143 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2144 2145 // Set the source order index. 2146 Init->setSourceOrder(i); 2147 2148 if (Init->isMemberInitializer()) { 2149 FieldDecl *Field = Init->getMember(); 2150 if (CheckRedundantInit(*this, Init, Members[Field]) || 2151 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2152 HadError = true; 2153 } else { 2154 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2155 if (CheckRedundantInit(*this, Init, Members[Key])) 2156 HadError = true; 2157 } 2158 } 2159 2160 if (HadError) 2161 return; 2162 2163 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2164 2165 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2166} 2167 2168void 2169Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2170 CXXRecordDecl *ClassDecl) { 2171 // Ignore dependent contexts. 2172 if (ClassDecl->isDependentContext()) 2173 return; 2174 2175 // FIXME: all the access-control diagnostics are positioned on the 2176 // field/base declaration. That's probably good; that said, the 2177 // user might reasonably want to know why the destructor is being 2178 // emitted, and we currently don't say. 2179 2180 // Non-static data members. 2181 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2182 E = ClassDecl->field_end(); I != E; ++I) { 2183 FieldDecl *Field = *I; 2184 if (Field->isInvalidDecl()) 2185 continue; 2186 QualType FieldType = Context.getBaseElementType(Field->getType()); 2187 2188 const RecordType* RT = FieldType->getAs<RecordType>(); 2189 if (!RT) 2190 continue; 2191 2192 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2193 if (FieldClassDecl->hasTrivialDestructor()) 2194 continue; 2195 2196 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2197 CheckDestructorAccess(Field->getLocation(), Dtor, 2198 PDiag(diag::err_access_dtor_field) 2199 << Field->getDeclName() 2200 << FieldType); 2201 2202 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2203 } 2204 2205 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2206 2207 // Bases. 2208 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2209 E = ClassDecl->bases_end(); Base != E; ++Base) { 2210 // Bases are always records in a well-formed non-dependent class. 2211 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2212 2213 // Remember direct virtual bases. 2214 if (Base->isVirtual()) 2215 DirectVirtualBases.insert(RT); 2216 2217 // Ignore trivial destructors. 2218 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2219 if (BaseClassDecl->hasTrivialDestructor()) 2220 continue; 2221 2222 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2223 2224 // FIXME: caret should be on the start of the class name 2225 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2226 PDiag(diag::err_access_dtor_base) 2227 << Base->getType() 2228 << Base->getSourceRange()); 2229 2230 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2231 } 2232 2233 // Virtual bases. 2234 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2235 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2236 2237 // Bases are always records in a well-formed non-dependent class. 2238 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2239 2240 // Ignore direct virtual bases. 2241 if (DirectVirtualBases.count(RT)) 2242 continue; 2243 2244 // Ignore trivial destructors. 2245 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2246 if (BaseClassDecl->hasTrivialDestructor()) 2247 continue; 2248 2249 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2250 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2251 PDiag(diag::err_access_dtor_vbase) 2252 << VBase->getType()); 2253 2254 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2255 } 2256} 2257 2258void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2259 if (!CDtorDecl) 2260 return; 2261 2262 if (CXXConstructorDecl *Constructor 2263 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2264 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2265} 2266 2267bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2268 unsigned DiagID, AbstractDiagSelID SelID, 2269 const CXXRecordDecl *CurrentRD) { 2270 if (SelID == -1) 2271 return RequireNonAbstractType(Loc, T, 2272 PDiag(DiagID), CurrentRD); 2273 else 2274 return RequireNonAbstractType(Loc, T, 2275 PDiag(DiagID) << SelID, CurrentRD); 2276} 2277 2278bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2279 const PartialDiagnostic &PD, 2280 const CXXRecordDecl *CurrentRD) { 2281 if (!getLangOptions().CPlusPlus) 2282 return false; 2283 2284 if (const ArrayType *AT = Context.getAsArrayType(T)) 2285 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2286 CurrentRD); 2287 2288 if (const PointerType *PT = T->getAs<PointerType>()) { 2289 // Find the innermost pointer type. 2290 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2291 PT = T; 2292 2293 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2294 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2295 } 2296 2297 const RecordType *RT = T->getAs<RecordType>(); 2298 if (!RT) 2299 return false; 2300 2301 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2302 2303 if (CurrentRD && CurrentRD != RD) 2304 return false; 2305 2306 // FIXME: is this reasonable? It matches current behavior, but.... 2307 if (!RD->getDefinition()) 2308 return false; 2309 2310 if (!RD->isAbstract()) 2311 return false; 2312 2313 Diag(Loc, PD) << RD->getDeclName(); 2314 2315 // Check if we've already emitted the list of pure virtual functions for this 2316 // class. 2317 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2318 return true; 2319 2320 CXXFinalOverriderMap FinalOverriders; 2321 RD->getFinalOverriders(FinalOverriders); 2322 2323 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2324 MEnd = FinalOverriders.end(); 2325 M != MEnd; 2326 ++M) { 2327 for (OverridingMethods::iterator SO = M->second.begin(), 2328 SOEnd = M->second.end(); 2329 SO != SOEnd; ++SO) { 2330 // C++ [class.abstract]p4: 2331 // A class is abstract if it contains or inherits at least one 2332 // pure virtual function for which the final overrider is pure 2333 // virtual. 2334 2335 // 2336 if (SO->second.size() != 1) 2337 continue; 2338 2339 if (!SO->second.front().Method->isPure()) 2340 continue; 2341 2342 Diag(SO->second.front().Method->getLocation(), 2343 diag::note_pure_virtual_function) 2344 << SO->second.front().Method->getDeclName(); 2345 } 2346 } 2347 2348 if (!PureVirtualClassDiagSet) 2349 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2350 PureVirtualClassDiagSet->insert(RD); 2351 2352 return true; 2353} 2354 2355namespace { 2356 class AbstractClassUsageDiagnoser 2357 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2358 Sema &SemaRef; 2359 CXXRecordDecl *AbstractClass; 2360 2361 bool VisitDeclContext(const DeclContext *DC) { 2362 bool Invalid = false; 2363 2364 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2365 E = DC->decls_end(); I != E; ++I) 2366 Invalid |= Visit(*I); 2367 2368 return Invalid; 2369 } 2370 2371 public: 2372 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2373 : SemaRef(SemaRef), AbstractClass(ac) { 2374 Visit(SemaRef.Context.getTranslationUnitDecl()); 2375 } 2376 2377 bool VisitFunctionDecl(const FunctionDecl *FD) { 2378 if (FD->isThisDeclarationADefinition()) { 2379 // No need to do the check if we're in a definition, because it requires 2380 // that the return/param types are complete. 2381 // because that requires 2382 return VisitDeclContext(FD); 2383 } 2384 2385 // Check the return type. 2386 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2387 bool Invalid = 2388 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2389 diag::err_abstract_type_in_decl, 2390 Sema::AbstractReturnType, 2391 AbstractClass); 2392 2393 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2394 E = FD->param_end(); I != E; ++I) { 2395 const ParmVarDecl *VD = *I; 2396 Invalid |= 2397 SemaRef.RequireNonAbstractType(VD->getLocation(), 2398 VD->getOriginalType(), 2399 diag::err_abstract_type_in_decl, 2400 Sema::AbstractParamType, 2401 AbstractClass); 2402 } 2403 2404 return Invalid; 2405 } 2406 2407 bool VisitDecl(const Decl* D) { 2408 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2409 return VisitDeclContext(DC); 2410 2411 return false; 2412 } 2413 }; 2414} 2415 2416/// \brief Perform semantic checks on a class definition that has been 2417/// completing, introducing implicitly-declared members, checking for 2418/// abstract types, etc. 2419void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2420 if (!Record || Record->isInvalidDecl()) 2421 return; 2422 2423 if (!Record->isDependentType()) 2424 AddImplicitlyDeclaredMembersToClass(S, Record); 2425 2426 if (Record->isInvalidDecl()) 2427 return; 2428 2429 // Set access bits correctly on the directly-declared conversions. 2430 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2431 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2432 Convs->setAccess(I, (*I)->getAccess()); 2433 2434 // Determine whether we need to check for final overriders. We do 2435 // this either when there are virtual base classes (in which case we 2436 // may end up finding multiple final overriders for a given virtual 2437 // function) or any of the base classes is abstract (in which case 2438 // we might detect that this class is abstract). 2439 bool CheckFinalOverriders = false; 2440 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2441 !Record->isDependentType()) { 2442 if (Record->getNumVBases()) 2443 CheckFinalOverriders = true; 2444 else if (!Record->isAbstract()) { 2445 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2446 BEnd = Record->bases_end(); 2447 B != BEnd; ++B) { 2448 CXXRecordDecl *BaseDecl 2449 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2450 if (BaseDecl->isAbstract()) { 2451 CheckFinalOverriders = true; 2452 break; 2453 } 2454 } 2455 } 2456 } 2457 2458 if (CheckFinalOverriders) { 2459 CXXFinalOverriderMap FinalOverriders; 2460 Record->getFinalOverriders(FinalOverriders); 2461 2462 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2463 MEnd = FinalOverriders.end(); 2464 M != MEnd; ++M) { 2465 for (OverridingMethods::iterator SO = M->second.begin(), 2466 SOEnd = M->second.end(); 2467 SO != SOEnd; ++SO) { 2468 assert(SO->second.size() > 0 && 2469 "All virtual functions have overridding virtual functions"); 2470 if (SO->second.size() == 1) { 2471 // C++ [class.abstract]p4: 2472 // A class is abstract if it contains or inherits at least one 2473 // pure virtual function for which the final overrider is pure 2474 // virtual. 2475 if (SO->second.front().Method->isPure()) 2476 Record->setAbstract(true); 2477 continue; 2478 } 2479 2480 // C++ [class.virtual]p2: 2481 // In a derived class, if a virtual member function of a base 2482 // class subobject has more than one final overrider the 2483 // program is ill-formed. 2484 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2485 << (NamedDecl *)M->first << Record; 2486 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2487 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2488 OMEnd = SO->second.end(); 2489 OM != OMEnd; ++OM) 2490 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2491 << (NamedDecl *)M->first << OM->Method->getParent(); 2492 2493 Record->setInvalidDecl(); 2494 } 2495 } 2496 } 2497 2498 if (Record->isAbstract() && !Record->isInvalidDecl()) 2499 (void)AbstractClassUsageDiagnoser(*this, Record); 2500 2501 // If this is not an aggregate type and has no user-declared constructor, 2502 // complain about any non-static data members of reference or const scalar 2503 // type, since they will never get initializers. 2504 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2505 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2506 bool Complained = false; 2507 for (RecordDecl::field_iterator F = Record->field_begin(), 2508 FEnd = Record->field_end(); 2509 F != FEnd; ++F) { 2510 if (F->getType()->isReferenceType() || 2511 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2512 if (!Complained) { 2513 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2514 << Record->getTagKind() << Record; 2515 Complained = true; 2516 } 2517 2518 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2519 << F->getType()->isReferenceType() 2520 << F->getDeclName(); 2521 } 2522 } 2523 } 2524 2525 if (Record->isDynamicClass()) 2526 DynamicClasses.push_back(Record); 2527} 2528 2529void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2530 DeclPtrTy TagDecl, 2531 SourceLocation LBrac, 2532 SourceLocation RBrac, 2533 AttributeList *AttrList) { 2534 if (!TagDecl) 2535 return; 2536 2537 AdjustDeclIfTemplate(TagDecl); 2538 2539 ActOnFields(S, RLoc, TagDecl, 2540 (DeclPtrTy*)FieldCollector->getCurFields(), 2541 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2542 2543 CheckCompletedCXXClass(S, 2544 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2545} 2546 2547/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2548/// special functions, such as the default constructor, copy 2549/// constructor, or destructor, to the given C++ class (C++ 2550/// [special]p1). This routine can only be executed just before the 2551/// definition of the class is complete. 2552/// 2553/// The scope, if provided, is the class scope. 2554void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2555 CXXRecordDecl *ClassDecl) { 2556 CanQualType ClassType 2557 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2558 2559 // FIXME: Implicit declarations have exception specifications, which are 2560 // the union of the specifications of the implicitly called functions. 2561 2562 if (!ClassDecl->hasUserDeclaredConstructor()) { 2563 // C++ [class.ctor]p5: 2564 // A default constructor for a class X is a constructor of class X 2565 // that can be called without an argument. If there is no 2566 // user-declared constructor for class X, a default constructor is 2567 // implicitly declared. An implicitly-declared default constructor 2568 // is an inline public member of its class. 2569 DeclarationName Name 2570 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2571 CXXConstructorDecl *DefaultCon = 2572 CXXConstructorDecl::Create(Context, ClassDecl, 2573 ClassDecl->getLocation(), Name, 2574 Context.getFunctionType(Context.VoidTy, 2575 0, 0, false, 0, 2576 /*FIXME*/false, false, 2577 0, 0, 2578 FunctionType::ExtInfo()), 2579 /*TInfo=*/0, 2580 /*isExplicit=*/false, 2581 /*isInline=*/true, 2582 /*isImplicitlyDeclared=*/true); 2583 DefaultCon->setAccess(AS_public); 2584 DefaultCon->setImplicit(); 2585 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2586 if (S) 2587 PushOnScopeChains(DefaultCon, S, true); 2588 else 2589 ClassDecl->addDecl(DefaultCon); 2590 } 2591 2592 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2593 // C++ [class.copy]p4: 2594 // If the class definition does not explicitly declare a copy 2595 // constructor, one is declared implicitly. 2596 2597 // C++ [class.copy]p5: 2598 // The implicitly-declared copy constructor for a class X will 2599 // have the form 2600 // 2601 // X::X(const X&) 2602 // 2603 // if 2604 bool HasConstCopyConstructor = true; 2605 2606 // -- each direct or virtual base class B of X has a copy 2607 // constructor whose first parameter is of type const B& or 2608 // const volatile B&, and 2609 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2610 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2611 const CXXRecordDecl *BaseClassDecl 2612 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2613 HasConstCopyConstructor 2614 = BaseClassDecl->hasConstCopyConstructor(Context); 2615 } 2616 2617 // -- for all the nonstatic data members of X that are of a 2618 // class type M (or array thereof), each such class type 2619 // has a copy constructor whose first parameter is of type 2620 // const M& or const volatile M&. 2621 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2622 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2623 ++Field) { 2624 QualType FieldType = (*Field)->getType(); 2625 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2626 FieldType = Array->getElementType(); 2627 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2628 const CXXRecordDecl *FieldClassDecl 2629 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2630 HasConstCopyConstructor 2631 = FieldClassDecl->hasConstCopyConstructor(Context); 2632 } 2633 } 2634 2635 // Otherwise, the implicitly declared copy constructor will have 2636 // the form 2637 // 2638 // X::X(X&) 2639 QualType ArgType = ClassType; 2640 if (HasConstCopyConstructor) 2641 ArgType = ArgType.withConst(); 2642 ArgType = Context.getLValueReferenceType(ArgType); 2643 2644 // An implicitly-declared copy constructor is an inline public 2645 // member of its class. 2646 DeclarationName Name 2647 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2648 CXXConstructorDecl *CopyConstructor 2649 = CXXConstructorDecl::Create(Context, ClassDecl, 2650 ClassDecl->getLocation(), Name, 2651 Context.getFunctionType(Context.VoidTy, 2652 &ArgType, 1, 2653 false, 0, 2654 /*FIXME: hasExceptionSpec*/false, 2655 false, 0, 0, 2656 FunctionType::ExtInfo()), 2657 /*TInfo=*/0, 2658 /*isExplicit=*/false, 2659 /*isInline=*/true, 2660 /*isImplicitlyDeclared=*/true); 2661 CopyConstructor->setAccess(AS_public); 2662 CopyConstructor->setImplicit(); 2663 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2664 2665 // Add the parameter to the constructor. 2666 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2667 ClassDecl->getLocation(), 2668 /*IdentifierInfo=*/0, 2669 ArgType, /*TInfo=*/0, 2670 VarDecl::None, 2671 VarDecl::None, 0); 2672 CopyConstructor->setParams(&FromParam, 1); 2673 if (S) 2674 PushOnScopeChains(CopyConstructor, S, true); 2675 else 2676 ClassDecl->addDecl(CopyConstructor); 2677 } 2678 2679 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2680 // Note: The following rules are largely analoguous to the copy 2681 // constructor rules. Note that virtual bases are not taken into account 2682 // for determining the argument type of the operator. Note also that 2683 // operators taking an object instead of a reference are allowed. 2684 // 2685 // C++ [class.copy]p10: 2686 // If the class definition does not explicitly declare a copy 2687 // assignment operator, one is declared implicitly. 2688 // The implicitly-defined copy assignment operator for a class X 2689 // will have the form 2690 // 2691 // X& X::operator=(const X&) 2692 // 2693 // if 2694 bool HasConstCopyAssignment = true; 2695 2696 // -- each direct base class B of X has a copy assignment operator 2697 // whose parameter is of type const B&, const volatile B& or B, 2698 // and 2699 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2700 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2701 assert(!Base->getType()->isDependentType() && 2702 "Cannot generate implicit members for class with dependent bases."); 2703 const CXXRecordDecl *BaseClassDecl 2704 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2705 const CXXMethodDecl *MD = 0; 2706 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2707 MD); 2708 } 2709 2710 // -- for all the nonstatic data members of X that are of a class 2711 // type M (or array thereof), each such class type has a copy 2712 // assignment operator whose parameter is of type const M&, 2713 // const volatile M& or M. 2714 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2715 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2716 ++Field) { 2717 QualType FieldType = (*Field)->getType(); 2718 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2719 FieldType = Array->getElementType(); 2720 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2721 const CXXRecordDecl *FieldClassDecl 2722 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2723 const CXXMethodDecl *MD = 0; 2724 HasConstCopyAssignment 2725 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2726 } 2727 } 2728 2729 // Otherwise, the implicitly declared copy assignment operator will 2730 // have the form 2731 // 2732 // X& X::operator=(X&) 2733 QualType ArgType = ClassType; 2734 QualType RetType = Context.getLValueReferenceType(ArgType); 2735 if (HasConstCopyAssignment) 2736 ArgType = ArgType.withConst(); 2737 ArgType = Context.getLValueReferenceType(ArgType); 2738 2739 // An implicitly-declared copy assignment operator is an inline public 2740 // member of its class. 2741 DeclarationName Name = 2742 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2743 CXXMethodDecl *CopyAssignment = 2744 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2745 Context.getFunctionType(RetType, &ArgType, 1, 2746 false, 0, 2747 /*FIXME: hasExceptionSpec*/false, 2748 false, 0, 0, 2749 FunctionType::ExtInfo()), 2750 /*TInfo=*/0, /*isStatic=*/false, 2751 /*StorageClassAsWritten=*/FunctionDecl::None, 2752 /*isInline=*/true); 2753 CopyAssignment->setAccess(AS_public); 2754 CopyAssignment->setImplicit(); 2755 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2756 CopyAssignment->setCopyAssignment(true); 2757 2758 // Add the parameter to the operator. 2759 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2760 ClassDecl->getLocation(), 2761 /*Id=*/0, 2762 ArgType, /*TInfo=*/0, 2763 VarDecl::None, 2764 VarDecl::None, 0); 2765 CopyAssignment->setParams(&FromParam, 1); 2766 2767 // Don't call addedAssignmentOperator. There is no way to distinguish an 2768 // implicit from an explicit assignment operator. 2769 if (S) 2770 PushOnScopeChains(CopyAssignment, S, true); 2771 else 2772 ClassDecl->addDecl(CopyAssignment); 2773 AddOverriddenMethods(ClassDecl, CopyAssignment); 2774 } 2775 2776 if (!ClassDecl->hasUserDeclaredDestructor()) { 2777 // C++ [class.dtor]p2: 2778 // If a class has no user-declared destructor, a destructor is 2779 // declared implicitly. An implicitly-declared destructor is an 2780 // inline public member of its class. 2781 QualType Ty = Context.getFunctionType(Context.VoidTy, 2782 0, 0, false, 0, 2783 /*FIXME: hasExceptionSpec*/false, 2784 false, 0, 0, FunctionType::ExtInfo()); 2785 2786 DeclarationName Name 2787 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2788 CXXDestructorDecl *Destructor 2789 = CXXDestructorDecl::Create(Context, ClassDecl, 2790 ClassDecl->getLocation(), Name, Ty, 2791 /*isInline=*/true, 2792 /*isImplicitlyDeclared=*/true); 2793 Destructor->setAccess(AS_public); 2794 Destructor->setImplicit(); 2795 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2796 if (S) 2797 PushOnScopeChains(Destructor, S, true); 2798 else 2799 ClassDecl->addDecl(Destructor); 2800 2801 // This could be uniqued if it ever proves significant. 2802 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2803 2804 AddOverriddenMethods(ClassDecl, Destructor); 2805 } 2806} 2807 2808void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2809 Decl *D = TemplateD.getAs<Decl>(); 2810 if (!D) 2811 return; 2812 2813 TemplateParameterList *Params = 0; 2814 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2815 Params = Template->getTemplateParameters(); 2816 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2817 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2818 Params = PartialSpec->getTemplateParameters(); 2819 else 2820 return; 2821 2822 for (TemplateParameterList::iterator Param = Params->begin(), 2823 ParamEnd = Params->end(); 2824 Param != ParamEnd; ++Param) { 2825 NamedDecl *Named = cast<NamedDecl>(*Param); 2826 if (Named->getDeclName()) { 2827 S->AddDecl(DeclPtrTy::make(Named)); 2828 IdResolver.AddDecl(Named); 2829 } 2830 } 2831} 2832 2833void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2834 if (!RecordD) return; 2835 AdjustDeclIfTemplate(RecordD); 2836 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2837 PushDeclContext(S, Record); 2838} 2839 2840void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2841 if (!RecordD) return; 2842 PopDeclContext(); 2843} 2844 2845/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2846/// parsing a top-level (non-nested) C++ class, and we are now 2847/// parsing those parts of the given Method declaration that could 2848/// not be parsed earlier (C++ [class.mem]p2), such as default 2849/// arguments. This action should enter the scope of the given 2850/// Method declaration as if we had just parsed the qualified method 2851/// name. However, it should not bring the parameters into scope; 2852/// that will be performed by ActOnDelayedCXXMethodParameter. 2853void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2854} 2855 2856/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2857/// C++ method declaration. We're (re-)introducing the given 2858/// function parameter into scope for use in parsing later parts of 2859/// the method declaration. For example, we could see an 2860/// ActOnParamDefaultArgument event for this parameter. 2861void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2862 if (!ParamD) 2863 return; 2864 2865 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2866 2867 // If this parameter has an unparsed default argument, clear it out 2868 // to make way for the parsed default argument. 2869 if (Param->hasUnparsedDefaultArg()) 2870 Param->setDefaultArg(0); 2871 2872 S->AddDecl(DeclPtrTy::make(Param)); 2873 if (Param->getDeclName()) 2874 IdResolver.AddDecl(Param); 2875} 2876 2877/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2878/// processing the delayed method declaration for Method. The method 2879/// declaration is now considered finished. There may be a separate 2880/// ActOnStartOfFunctionDef action later (not necessarily 2881/// immediately!) for this method, if it was also defined inside the 2882/// class body. 2883void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2884 if (!MethodD) 2885 return; 2886 2887 AdjustDeclIfTemplate(MethodD); 2888 2889 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2890 2891 // Now that we have our default arguments, check the constructor 2892 // again. It could produce additional diagnostics or affect whether 2893 // the class has implicitly-declared destructors, among other 2894 // things. 2895 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2896 CheckConstructor(Constructor); 2897 2898 // Check the default arguments, which we may have added. 2899 if (!Method->isInvalidDecl()) 2900 CheckCXXDefaultArguments(Method); 2901} 2902 2903/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2904/// the well-formedness of the constructor declarator @p D with type @p 2905/// R. If there are any errors in the declarator, this routine will 2906/// emit diagnostics and set the invalid bit to true. In any case, the type 2907/// will be updated to reflect a well-formed type for the constructor and 2908/// returned. 2909QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2910 FunctionDecl::StorageClass &SC) { 2911 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2912 2913 // C++ [class.ctor]p3: 2914 // A constructor shall not be virtual (10.3) or static (9.4). A 2915 // constructor can be invoked for a const, volatile or const 2916 // volatile object. A constructor shall not be declared const, 2917 // volatile, or const volatile (9.3.2). 2918 if (isVirtual) { 2919 if (!D.isInvalidType()) 2920 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2921 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2922 << SourceRange(D.getIdentifierLoc()); 2923 D.setInvalidType(); 2924 } 2925 if (SC == FunctionDecl::Static) { 2926 if (!D.isInvalidType()) 2927 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2928 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2929 << SourceRange(D.getIdentifierLoc()); 2930 D.setInvalidType(); 2931 SC = FunctionDecl::None; 2932 } 2933 2934 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2935 if (FTI.TypeQuals != 0) { 2936 if (FTI.TypeQuals & Qualifiers::Const) 2937 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2938 << "const" << SourceRange(D.getIdentifierLoc()); 2939 if (FTI.TypeQuals & Qualifiers::Volatile) 2940 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2941 << "volatile" << SourceRange(D.getIdentifierLoc()); 2942 if (FTI.TypeQuals & Qualifiers::Restrict) 2943 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2944 << "restrict" << SourceRange(D.getIdentifierLoc()); 2945 } 2946 2947 // Rebuild the function type "R" without any type qualifiers (in 2948 // case any of the errors above fired) and with "void" as the 2949 // return type, since constructors don't have return types. We 2950 // *always* have to do this, because GetTypeForDeclarator will 2951 // put in a result type of "int" when none was specified. 2952 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2953 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2954 Proto->getNumArgs(), 2955 Proto->isVariadic(), 0, 2956 Proto->hasExceptionSpec(), 2957 Proto->hasAnyExceptionSpec(), 2958 Proto->getNumExceptions(), 2959 Proto->exception_begin(), 2960 Proto->getExtInfo()); 2961} 2962 2963/// CheckConstructor - Checks a fully-formed constructor for 2964/// well-formedness, issuing any diagnostics required. Returns true if 2965/// the constructor declarator is invalid. 2966void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2967 CXXRecordDecl *ClassDecl 2968 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2969 if (!ClassDecl) 2970 return Constructor->setInvalidDecl(); 2971 2972 // C++ [class.copy]p3: 2973 // A declaration of a constructor for a class X is ill-formed if 2974 // its first parameter is of type (optionally cv-qualified) X and 2975 // either there are no other parameters or else all other 2976 // parameters have default arguments. 2977 if (!Constructor->isInvalidDecl() && 2978 ((Constructor->getNumParams() == 1) || 2979 (Constructor->getNumParams() > 1 && 2980 Constructor->getParamDecl(1)->hasDefaultArg())) && 2981 Constructor->getTemplateSpecializationKind() 2982 != TSK_ImplicitInstantiation) { 2983 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2984 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2985 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2986 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2987 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2988 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2989 2990 // FIXME: Rather that making the constructor invalid, we should endeavor 2991 // to fix the type. 2992 Constructor->setInvalidDecl(); 2993 } 2994 } 2995 2996 // Notify the class that we've added a constructor. In principle we 2997 // don't need to do this for out-of-line declarations; in practice 2998 // we only instantiate the most recent declaration of a method, so 2999 // we have to call this for everything but friends. 3000 if (!Constructor->getFriendObjectKind()) 3001 ClassDecl->addedConstructor(Context, Constructor); 3002} 3003 3004/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 3005/// issuing any diagnostics required. Returns true on error. 3006bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3007 CXXRecordDecl *RD = Destructor->getParent(); 3008 3009 if (Destructor->isVirtual()) { 3010 SourceLocation Loc; 3011 3012 if (!Destructor->isImplicit()) 3013 Loc = Destructor->getLocation(); 3014 else 3015 Loc = RD->getLocation(); 3016 3017 // If we have a virtual destructor, look up the deallocation function 3018 FunctionDecl *OperatorDelete = 0; 3019 DeclarationName Name = 3020 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3021 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3022 return true; 3023 3024 Destructor->setOperatorDelete(OperatorDelete); 3025 } 3026 3027 return false; 3028} 3029 3030static inline bool 3031FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3032 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3033 FTI.ArgInfo[0].Param && 3034 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 3035} 3036 3037/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3038/// the well-formednes of the destructor declarator @p D with type @p 3039/// R. If there are any errors in the declarator, this routine will 3040/// emit diagnostics and set the declarator to invalid. Even if this happens, 3041/// will be updated to reflect a well-formed type for the destructor and 3042/// returned. 3043QualType Sema::CheckDestructorDeclarator(Declarator &D, 3044 FunctionDecl::StorageClass& SC) { 3045 // C++ [class.dtor]p1: 3046 // [...] A typedef-name that names a class is a class-name 3047 // (7.1.3); however, a typedef-name that names a class shall not 3048 // be used as the identifier in the declarator for a destructor 3049 // declaration. 3050 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3051 if (isa<TypedefType>(DeclaratorType)) { 3052 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3053 << DeclaratorType; 3054 D.setInvalidType(); 3055 } 3056 3057 // C++ [class.dtor]p2: 3058 // A destructor is used to destroy objects of its class type. A 3059 // destructor takes no parameters, and no return type can be 3060 // specified for it (not even void). The address of a destructor 3061 // shall not be taken. A destructor shall not be static. A 3062 // destructor can be invoked for a const, volatile or const 3063 // volatile object. A destructor shall not be declared const, 3064 // volatile or const volatile (9.3.2). 3065 if (SC == FunctionDecl::Static) { 3066 if (!D.isInvalidType()) 3067 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3068 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3069 << SourceRange(D.getIdentifierLoc()); 3070 SC = FunctionDecl::None; 3071 D.setInvalidType(); 3072 } 3073 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3074 // Destructors don't have return types, but the parser will 3075 // happily parse something like: 3076 // 3077 // class X { 3078 // float ~X(); 3079 // }; 3080 // 3081 // The return type will be eliminated later. 3082 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3083 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3084 << SourceRange(D.getIdentifierLoc()); 3085 } 3086 3087 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3088 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3089 if (FTI.TypeQuals & Qualifiers::Const) 3090 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3091 << "const" << SourceRange(D.getIdentifierLoc()); 3092 if (FTI.TypeQuals & Qualifiers::Volatile) 3093 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3094 << "volatile" << SourceRange(D.getIdentifierLoc()); 3095 if (FTI.TypeQuals & Qualifiers::Restrict) 3096 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3097 << "restrict" << SourceRange(D.getIdentifierLoc()); 3098 D.setInvalidType(); 3099 } 3100 3101 // Make sure we don't have any parameters. 3102 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3103 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3104 3105 // Delete the parameters. 3106 FTI.freeArgs(); 3107 D.setInvalidType(); 3108 } 3109 3110 // Make sure the destructor isn't variadic. 3111 if (FTI.isVariadic) { 3112 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3113 D.setInvalidType(); 3114 } 3115 3116 // Rebuild the function type "R" without any type qualifiers or 3117 // parameters (in case any of the errors above fired) and with 3118 // "void" as the return type, since destructors don't have return 3119 // types. We *always* have to do this, because GetTypeForDeclarator 3120 // will put in a result type of "int" when none was specified. 3121 // FIXME: Exceptions! 3122 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3123 false, false, 0, 0, FunctionType::ExtInfo()); 3124} 3125 3126/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3127/// well-formednes of the conversion function declarator @p D with 3128/// type @p R. If there are any errors in the declarator, this routine 3129/// will emit diagnostics and return true. Otherwise, it will return 3130/// false. Either way, the type @p R will be updated to reflect a 3131/// well-formed type for the conversion operator. 3132void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3133 FunctionDecl::StorageClass& SC) { 3134 // C++ [class.conv.fct]p1: 3135 // Neither parameter types nor return type can be specified. The 3136 // type of a conversion function (8.3.5) is "function taking no 3137 // parameter returning conversion-type-id." 3138 if (SC == FunctionDecl::Static) { 3139 if (!D.isInvalidType()) 3140 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3141 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3142 << SourceRange(D.getIdentifierLoc()); 3143 D.setInvalidType(); 3144 SC = FunctionDecl::None; 3145 } 3146 3147 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3148 3149 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3150 // Conversion functions don't have return types, but the parser will 3151 // happily parse something like: 3152 // 3153 // class X { 3154 // float operator bool(); 3155 // }; 3156 // 3157 // The return type will be changed later anyway. 3158 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3159 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3160 << SourceRange(D.getIdentifierLoc()); 3161 D.setInvalidType(); 3162 } 3163 3164 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3165 3166 // Make sure we don't have any parameters. 3167 if (Proto->getNumArgs() > 0) { 3168 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3169 3170 // Delete the parameters. 3171 D.getTypeObject(0).Fun.freeArgs(); 3172 D.setInvalidType(); 3173 } else if (Proto->isVariadic()) { 3174 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3175 D.setInvalidType(); 3176 } 3177 3178 // Diagnose "&operator bool()" and other such nonsense. This 3179 // is actually a gcc extension which we don't support. 3180 if (Proto->getResultType() != ConvType) { 3181 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3182 << Proto->getResultType(); 3183 D.setInvalidType(); 3184 ConvType = Proto->getResultType(); 3185 } 3186 3187 // C++ [class.conv.fct]p4: 3188 // The conversion-type-id shall not represent a function type nor 3189 // an array type. 3190 if (ConvType->isArrayType()) { 3191 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3192 ConvType = Context.getPointerType(ConvType); 3193 D.setInvalidType(); 3194 } else if (ConvType->isFunctionType()) { 3195 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3196 ConvType = Context.getPointerType(ConvType); 3197 D.setInvalidType(); 3198 } 3199 3200 // Rebuild the function type "R" without any parameters (in case any 3201 // of the errors above fired) and with the conversion type as the 3202 // return type. 3203 if (D.isInvalidType()) { 3204 R = Context.getFunctionType(ConvType, 0, 0, false, 3205 Proto->getTypeQuals(), 3206 Proto->hasExceptionSpec(), 3207 Proto->hasAnyExceptionSpec(), 3208 Proto->getNumExceptions(), 3209 Proto->exception_begin(), 3210 Proto->getExtInfo()); 3211 } 3212 3213 // C++0x explicit conversion operators. 3214 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3215 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3216 diag::warn_explicit_conversion_functions) 3217 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3218} 3219 3220/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3221/// the declaration of the given C++ conversion function. This routine 3222/// is responsible for recording the conversion function in the C++ 3223/// class, if possible. 3224Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3225 assert(Conversion && "Expected to receive a conversion function declaration"); 3226 3227 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3228 3229 // Make sure we aren't redeclaring the conversion function. 3230 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3231 3232 // C++ [class.conv.fct]p1: 3233 // [...] A conversion function is never used to convert a 3234 // (possibly cv-qualified) object to the (possibly cv-qualified) 3235 // same object type (or a reference to it), to a (possibly 3236 // cv-qualified) base class of that type (or a reference to it), 3237 // or to (possibly cv-qualified) void. 3238 // FIXME: Suppress this warning if the conversion function ends up being a 3239 // virtual function that overrides a virtual function in a base class. 3240 QualType ClassType 3241 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3242 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3243 ConvType = ConvTypeRef->getPointeeType(); 3244 if (ConvType->isRecordType()) { 3245 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3246 if (ConvType == ClassType) 3247 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3248 << ClassType; 3249 else if (IsDerivedFrom(ClassType, ConvType)) 3250 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3251 << ClassType << ConvType; 3252 } else if (ConvType->isVoidType()) { 3253 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3254 << ClassType << ConvType; 3255 } 3256 3257 if (Conversion->getPrimaryTemplate()) { 3258 // ignore specializations 3259 } else if (Conversion->getPreviousDeclaration()) { 3260 if (FunctionTemplateDecl *ConversionTemplate 3261 = Conversion->getDescribedFunctionTemplate()) { 3262 if (ClassDecl->replaceConversion( 3263 ConversionTemplate->getPreviousDeclaration(), 3264 ConversionTemplate)) 3265 return DeclPtrTy::make(ConversionTemplate); 3266 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3267 Conversion)) 3268 return DeclPtrTy::make(Conversion); 3269 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3270 } else if (FunctionTemplateDecl *ConversionTemplate 3271 = Conversion->getDescribedFunctionTemplate()) 3272 ClassDecl->addConversionFunction(ConversionTemplate); 3273 else 3274 ClassDecl->addConversionFunction(Conversion); 3275 3276 return DeclPtrTy::make(Conversion); 3277} 3278 3279//===----------------------------------------------------------------------===// 3280// Namespace Handling 3281//===----------------------------------------------------------------------===// 3282 3283/// ActOnStartNamespaceDef - This is called at the start of a namespace 3284/// definition. 3285Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3286 SourceLocation IdentLoc, 3287 IdentifierInfo *II, 3288 SourceLocation LBrace, 3289 AttributeList *AttrList) { 3290 NamespaceDecl *Namespc = 3291 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3292 Namespc->setLBracLoc(LBrace); 3293 3294 Scope *DeclRegionScope = NamespcScope->getParent(); 3295 3296 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3297 3298 if (II) { 3299 // C++ [namespace.def]p2: 3300 // The identifier in an original-namespace-definition shall not have been 3301 // previously defined in the declarative region in which the 3302 // original-namespace-definition appears. The identifier in an 3303 // original-namespace-definition is the name of the namespace. Subsequently 3304 // in that declarative region, it is treated as an original-namespace-name. 3305 3306 NamedDecl *PrevDecl 3307 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3308 ForRedeclaration); 3309 3310 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3311 // This is an extended namespace definition. 3312 // Attach this namespace decl to the chain of extended namespace 3313 // definitions. 3314 OrigNS->setNextNamespace(Namespc); 3315 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3316 3317 // Remove the previous declaration from the scope. 3318 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3319 IdResolver.RemoveDecl(OrigNS); 3320 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3321 } 3322 } else if (PrevDecl) { 3323 // This is an invalid name redefinition. 3324 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3325 << Namespc->getDeclName(); 3326 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3327 Namespc->setInvalidDecl(); 3328 // Continue on to push Namespc as current DeclContext and return it. 3329 } else if (II->isStr("std") && 3330 CurContext->getLookupContext()->isTranslationUnit()) { 3331 // This is the first "real" definition of the namespace "std", so update 3332 // our cache of the "std" namespace to point at this definition. 3333 if (StdNamespace) { 3334 // We had already defined a dummy namespace "std". Link this new 3335 // namespace definition to the dummy namespace "std". 3336 StdNamespace->setNextNamespace(Namespc); 3337 StdNamespace->setLocation(IdentLoc); 3338 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3339 } 3340 3341 // Make our StdNamespace cache point at the first real definition of the 3342 // "std" namespace. 3343 StdNamespace = Namespc; 3344 } 3345 3346 PushOnScopeChains(Namespc, DeclRegionScope); 3347 } else { 3348 // Anonymous namespaces. 3349 assert(Namespc->isAnonymousNamespace()); 3350 3351 // Link the anonymous namespace into its parent. 3352 NamespaceDecl *PrevDecl; 3353 DeclContext *Parent = CurContext->getLookupContext(); 3354 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3355 PrevDecl = TU->getAnonymousNamespace(); 3356 TU->setAnonymousNamespace(Namespc); 3357 } else { 3358 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3359 PrevDecl = ND->getAnonymousNamespace(); 3360 ND->setAnonymousNamespace(Namespc); 3361 } 3362 3363 // Link the anonymous namespace with its previous declaration. 3364 if (PrevDecl) { 3365 assert(PrevDecl->isAnonymousNamespace()); 3366 assert(!PrevDecl->getNextNamespace()); 3367 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3368 PrevDecl->setNextNamespace(Namespc); 3369 } 3370 3371 CurContext->addDecl(Namespc); 3372 3373 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3374 // behaves as if it were replaced by 3375 // namespace unique { /* empty body */ } 3376 // using namespace unique; 3377 // namespace unique { namespace-body } 3378 // where all occurrences of 'unique' in a translation unit are 3379 // replaced by the same identifier and this identifier differs 3380 // from all other identifiers in the entire program. 3381 3382 // We just create the namespace with an empty name and then add an 3383 // implicit using declaration, just like the standard suggests. 3384 // 3385 // CodeGen enforces the "universally unique" aspect by giving all 3386 // declarations semantically contained within an anonymous 3387 // namespace internal linkage. 3388 3389 if (!PrevDecl) { 3390 UsingDirectiveDecl* UD 3391 = UsingDirectiveDecl::Create(Context, CurContext, 3392 /* 'using' */ LBrace, 3393 /* 'namespace' */ SourceLocation(), 3394 /* qualifier */ SourceRange(), 3395 /* NNS */ NULL, 3396 /* identifier */ SourceLocation(), 3397 Namespc, 3398 /* Ancestor */ CurContext); 3399 UD->setImplicit(); 3400 CurContext->addDecl(UD); 3401 } 3402 } 3403 3404 // Although we could have an invalid decl (i.e. the namespace name is a 3405 // redefinition), push it as current DeclContext and try to continue parsing. 3406 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3407 // for the namespace has the declarations that showed up in that particular 3408 // namespace definition. 3409 PushDeclContext(NamespcScope, Namespc); 3410 return DeclPtrTy::make(Namespc); 3411} 3412 3413/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3414/// is a namespace alias, returns the namespace it points to. 3415static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3416 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3417 return AD->getNamespace(); 3418 return dyn_cast_or_null<NamespaceDecl>(D); 3419} 3420 3421/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3422/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3423void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3424 Decl *Dcl = D.getAs<Decl>(); 3425 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3426 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3427 Namespc->setRBracLoc(RBrace); 3428 PopDeclContext(); 3429} 3430 3431Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3432 SourceLocation UsingLoc, 3433 SourceLocation NamespcLoc, 3434 CXXScopeSpec &SS, 3435 SourceLocation IdentLoc, 3436 IdentifierInfo *NamespcName, 3437 AttributeList *AttrList) { 3438 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3439 assert(NamespcName && "Invalid NamespcName."); 3440 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3441 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3442 3443 UsingDirectiveDecl *UDir = 0; 3444 3445 // Lookup namespace name. 3446 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3447 LookupParsedName(R, S, &SS); 3448 if (R.isAmbiguous()) 3449 return DeclPtrTy(); 3450 3451 if (!R.empty()) { 3452 NamedDecl *Named = R.getFoundDecl(); 3453 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3454 && "expected namespace decl"); 3455 // C++ [namespace.udir]p1: 3456 // A using-directive specifies that the names in the nominated 3457 // namespace can be used in the scope in which the 3458 // using-directive appears after the using-directive. During 3459 // unqualified name lookup (3.4.1), the names appear as if they 3460 // were declared in the nearest enclosing namespace which 3461 // contains both the using-directive and the nominated 3462 // namespace. [Note: in this context, "contains" means "contains 3463 // directly or indirectly". ] 3464 3465 // Find enclosing context containing both using-directive and 3466 // nominated namespace. 3467 NamespaceDecl *NS = getNamespaceDecl(Named); 3468 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3469 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3470 CommonAncestor = CommonAncestor->getParent(); 3471 3472 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3473 SS.getRange(), 3474 (NestedNameSpecifier *)SS.getScopeRep(), 3475 IdentLoc, Named, CommonAncestor); 3476 PushUsingDirective(S, UDir); 3477 } else { 3478 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3479 } 3480 3481 // FIXME: We ignore attributes for now. 3482 delete AttrList; 3483 return DeclPtrTy::make(UDir); 3484} 3485 3486void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3487 // If scope has associated entity, then using directive is at namespace 3488 // or translation unit scope. We add UsingDirectiveDecls, into 3489 // it's lookup structure. 3490 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3491 Ctx->addDecl(UDir); 3492 else 3493 // Otherwise it is block-sope. using-directives will affect lookup 3494 // only to the end of scope. 3495 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3496} 3497 3498 3499Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3500 AccessSpecifier AS, 3501 bool HasUsingKeyword, 3502 SourceLocation UsingLoc, 3503 CXXScopeSpec &SS, 3504 UnqualifiedId &Name, 3505 AttributeList *AttrList, 3506 bool IsTypeName, 3507 SourceLocation TypenameLoc) { 3508 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3509 3510 switch (Name.getKind()) { 3511 case UnqualifiedId::IK_Identifier: 3512 case UnqualifiedId::IK_OperatorFunctionId: 3513 case UnqualifiedId::IK_LiteralOperatorId: 3514 case UnqualifiedId::IK_ConversionFunctionId: 3515 break; 3516 3517 case UnqualifiedId::IK_ConstructorName: 3518 case UnqualifiedId::IK_ConstructorTemplateId: 3519 // C++0x inherited constructors. 3520 if (getLangOptions().CPlusPlus0x) break; 3521 3522 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3523 << SS.getRange(); 3524 return DeclPtrTy(); 3525 3526 case UnqualifiedId::IK_DestructorName: 3527 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3528 << SS.getRange(); 3529 return DeclPtrTy(); 3530 3531 case UnqualifiedId::IK_TemplateId: 3532 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3533 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3534 return DeclPtrTy(); 3535 } 3536 3537 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3538 if (!TargetName) 3539 return DeclPtrTy(); 3540 3541 // Warn about using declarations. 3542 // TODO: store that the declaration was written without 'using' and 3543 // talk about access decls instead of using decls in the 3544 // diagnostics. 3545 if (!HasUsingKeyword) { 3546 UsingLoc = Name.getSourceRange().getBegin(); 3547 3548 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3549 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3550 } 3551 3552 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3553 Name.getSourceRange().getBegin(), 3554 TargetName, AttrList, 3555 /* IsInstantiation */ false, 3556 IsTypeName, TypenameLoc); 3557 if (UD) 3558 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3559 3560 return DeclPtrTy::make(UD); 3561} 3562 3563/// Determines whether to create a using shadow decl for a particular 3564/// decl, given the set of decls existing prior to this using lookup. 3565bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3566 const LookupResult &Previous) { 3567 // Diagnose finding a decl which is not from a base class of the 3568 // current class. We do this now because there are cases where this 3569 // function will silently decide not to build a shadow decl, which 3570 // will pre-empt further diagnostics. 3571 // 3572 // We don't need to do this in C++0x because we do the check once on 3573 // the qualifier. 3574 // 3575 // FIXME: diagnose the following if we care enough: 3576 // struct A { int foo; }; 3577 // struct B : A { using A::foo; }; 3578 // template <class T> struct C : A {}; 3579 // template <class T> struct D : C<T> { using B::foo; } // <--- 3580 // This is invalid (during instantiation) in C++03 because B::foo 3581 // resolves to the using decl in B, which is not a base class of D<T>. 3582 // We can't diagnose it immediately because C<T> is an unknown 3583 // specialization. The UsingShadowDecl in D<T> then points directly 3584 // to A::foo, which will look well-formed when we instantiate. 3585 // The right solution is to not collapse the shadow-decl chain. 3586 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3587 DeclContext *OrigDC = Orig->getDeclContext(); 3588 3589 // Handle enums and anonymous structs. 3590 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3591 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3592 while (OrigRec->isAnonymousStructOrUnion()) 3593 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3594 3595 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3596 if (OrigDC == CurContext) { 3597 Diag(Using->getLocation(), 3598 diag::err_using_decl_nested_name_specifier_is_current_class) 3599 << Using->getNestedNameRange(); 3600 Diag(Orig->getLocation(), diag::note_using_decl_target); 3601 return true; 3602 } 3603 3604 Diag(Using->getNestedNameRange().getBegin(), 3605 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3606 << Using->getTargetNestedNameDecl() 3607 << cast<CXXRecordDecl>(CurContext) 3608 << Using->getNestedNameRange(); 3609 Diag(Orig->getLocation(), diag::note_using_decl_target); 3610 return true; 3611 } 3612 } 3613 3614 if (Previous.empty()) return false; 3615 3616 NamedDecl *Target = Orig; 3617 if (isa<UsingShadowDecl>(Target)) 3618 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3619 3620 // If the target happens to be one of the previous declarations, we 3621 // don't have a conflict. 3622 // 3623 // FIXME: but we might be increasing its access, in which case we 3624 // should redeclare it. 3625 NamedDecl *NonTag = 0, *Tag = 0; 3626 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3627 I != E; ++I) { 3628 NamedDecl *D = (*I)->getUnderlyingDecl(); 3629 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3630 return false; 3631 3632 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3633 } 3634 3635 if (Target->isFunctionOrFunctionTemplate()) { 3636 FunctionDecl *FD; 3637 if (isa<FunctionTemplateDecl>(Target)) 3638 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3639 else 3640 FD = cast<FunctionDecl>(Target); 3641 3642 NamedDecl *OldDecl = 0; 3643 switch (CheckOverload(FD, Previous, OldDecl)) { 3644 case Ovl_Overload: 3645 return false; 3646 3647 case Ovl_NonFunction: 3648 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3649 break; 3650 3651 // We found a decl with the exact signature. 3652 case Ovl_Match: 3653 if (isa<UsingShadowDecl>(OldDecl)) { 3654 // Silently ignore the possible conflict. 3655 return false; 3656 } 3657 3658 // If we're in a record, we want to hide the target, so we 3659 // return true (without a diagnostic) to tell the caller not to 3660 // build a shadow decl. 3661 if (CurContext->isRecord()) 3662 return true; 3663 3664 // If we're not in a record, this is an error. 3665 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3666 break; 3667 } 3668 3669 Diag(Target->getLocation(), diag::note_using_decl_target); 3670 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3671 return true; 3672 } 3673 3674 // Target is not a function. 3675 3676 if (isa<TagDecl>(Target)) { 3677 // No conflict between a tag and a non-tag. 3678 if (!Tag) return false; 3679 3680 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3681 Diag(Target->getLocation(), diag::note_using_decl_target); 3682 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3683 return true; 3684 } 3685 3686 // No conflict between a tag and a non-tag. 3687 if (!NonTag) return false; 3688 3689 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3690 Diag(Target->getLocation(), diag::note_using_decl_target); 3691 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3692 return true; 3693} 3694 3695/// Builds a shadow declaration corresponding to a 'using' declaration. 3696UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3697 UsingDecl *UD, 3698 NamedDecl *Orig) { 3699 3700 // If we resolved to another shadow declaration, just coalesce them. 3701 NamedDecl *Target = Orig; 3702 if (isa<UsingShadowDecl>(Target)) { 3703 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3704 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3705 } 3706 3707 UsingShadowDecl *Shadow 3708 = UsingShadowDecl::Create(Context, CurContext, 3709 UD->getLocation(), UD, Target); 3710 UD->addShadowDecl(Shadow); 3711 3712 if (S) 3713 PushOnScopeChains(Shadow, S); 3714 else 3715 CurContext->addDecl(Shadow); 3716 Shadow->setAccess(UD->getAccess()); 3717 3718 // Register it as a conversion if appropriate. 3719 if (Shadow->getDeclName().getNameKind() 3720 == DeclarationName::CXXConversionFunctionName) 3721 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3722 3723 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3724 Shadow->setInvalidDecl(); 3725 3726 return Shadow; 3727} 3728 3729/// Hides a using shadow declaration. This is required by the current 3730/// using-decl implementation when a resolvable using declaration in a 3731/// class is followed by a declaration which would hide or override 3732/// one or more of the using decl's targets; for example: 3733/// 3734/// struct Base { void foo(int); }; 3735/// struct Derived : Base { 3736/// using Base::foo; 3737/// void foo(int); 3738/// }; 3739/// 3740/// The governing language is C++03 [namespace.udecl]p12: 3741/// 3742/// When a using-declaration brings names from a base class into a 3743/// derived class scope, member functions in the derived class 3744/// override and/or hide member functions with the same name and 3745/// parameter types in a base class (rather than conflicting). 3746/// 3747/// There are two ways to implement this: 3748/// (1) optimistically create shadow decls when they're not hidden 3749/// by existing declarations, or 3750/// (2) don't create any shadow decls (or at least don't make them 3751/// visible) until we've fully parsed/instantiated the class. 3752/// The problem with (1) is that we might have to retroactively remove 3753/// a shadow decl, which requires several O(n) operations because the 3754/// decl structures are (very reasonably) not designed for removal. 3755/// (2) avoids this but is very fiddly and phase-dependent. 3756void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3757 if (Shadow->getDeclName().getNameKind() == 3758 DeclarationName::CXXConversionFunctionName) 3759 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3760 3761 // Remove it from the DeclContext... 3762 Shadow->getDeclContext()->removeDecl(Shadow); 3763 3764 // ...and the scope, if applicable... 3765 if (S) { 3766 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3767 IdResolver.RemoveDecl(Shadow); 3768 } 3769 3770 // ...and the using decl. 3771 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3772 3773 // TODO: complain somehow if Shadow was used. It shouldn't 3774 // be possible for this to happen, because...? 3775} 3776 3777/// Builds a using declaration. 3778/// 3779/// \param IsInstantiation - Whether this call arises from an 3780/// instantiation of an unresolved using declaration. We treat 3781/// the lookup differently for these declarations. 3782NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3783 SourceLocation UsingLoc, 3784 CXXScopeSpec &SS, 3785 SourceLocation IdentLoc, 3786 DeclarationName Name, 3787 AttributeList *AttrList, 3788 bool IsInstantiation, 3789 bool IsTypeName, 3790 SourceLocation TypenameLoc) { 3791 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3792 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3793 3794 // FIXME: We ignore attributes for now. 3795 delete AttrList; 3796 3797 if (SS.isEmpty()) { 3798 Diag(IdentLoc, diag::err_using_requires_qualname); 3799 return 0; 3800 } 3801 3802 // Do the redeclaration lookup in the current scope. 3803 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3804 ForRedeclaration); 3805 Previous.setHideTags(false); 3806 if (S) { 3807 LookupName(Previous, S); 3808 3809 // It is really dumb that we have to do this. 3810 LookupResult::Filter F = Previous.makeFilter(); 3811 while (F.hasNext()) { 3812 NamedDecl *D = F.next(); 3813 if (!isDeclInScope(D, CurContext, S)) 3814 F.erase(); 3815 } 3816 F.done(); 3817 } else { 3818 assert(IsInstantiation && "no scope in non-instantiation"); 3819 assert(CurContext->isRecord() && "scope not record in instantiation"); 3820 LookupQualifiedName(Previous, CurContext); 3821 } 3822 3823 NestedNameSpecifier *NNS = 3824 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3825 3826 // Check for invalid redeclarations. 3827 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3828 return 0; 3829 3830 // Check for bad qualifiers. 3831 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3832 return 0; 3833 3834 DeclContext *LookupContext = computeDeclContext(SS); 3835 NamedDecl *D; 3836 if (!LookupContext) { 3837 if (IsTypeName) { 3838 // FIXME: not all declaration name kinds are legal here 3839 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3840 UsingLoc, TypenameLoc, 3841 SS.getRange(), NNS, 3842 IdentLoc, Name); 3843 } else { 3844 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3845 UsingLoc, SS.getRange(), NNS, 3846 IdentLoc, Name); 3847 } 3848 } else { 3849 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3850 SS.getRange(), UsingLoc, NNS, Name, 3851 IsTypeName); 3852 } 3853 D->setAccess(AS); 3854 CurContext->addDecl(D); 3855 3856 if (!LookupContext) return D; 3857 UsingDecl *UD = cast<UsingDecl>(D); 3858 3859 if (RequireCompleteDeclContext(SS, LookupContext)) { 3860 UD->setInvalidDecl(); 3861 return UD; 3862 } 3863 3864 // Look up the target name. 3865 3866 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3867 3868 // Unlike most lookups, we don't always want to hide tag 3869 // declarations: tag names are visible through the using declaration 3870 // even if hidden by ordinary names, *except* in a dependent context 3871 // where it's important for the sanity of two-phase lookup. 3872 if (!IsInstantiation) 3873 R.setHideTags(false); 3874 3875 LookupQualifiedName(R, LookupContext); 3876 3877 if (R.empty()) { 3878 Diag(IdentLoc, diag::err_no_member) 3879 << Name << LookupContext << SS.getRange(); 3880 UD->setInvalidDecl(); 3881 return UD; 3882 } 3883 3884 if (R.isAmbiguous()) { 3885 UD->setInvalidDecl(); 3886 return UD; 3887 } 3888 3889 if (IsTypeName) { 3890 // If we asked for a typename and got a non-type decl, error out. 3891 if (!R.getAsSingle<TypeDecl>()) { 3892 Diag(IdentLoc, diag::err_using_typename_non_type); 3893 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3894 Diag((*I)->getUnderlyingDecl()->getLocation(), 3895 diag::note_using_decl_target); 3896 UD->setInvalidDecl(); 3897 return UD; 3898 } 3899 } else { 3900 // If we asked for a non-typename and we got a type, error out, 3901 // but only if this is an instantiation of an unresolved using 3902 // decl. Otherwise just silently find the type name. 3903 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3904 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3905 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3906 UD->setInvalidDecl(); 3907 return UD; 3908 } 3909 } 3910 3911 // C++0x N2914 [namespace.udecl]p6: 3912 // A using-declaration shall not name a namespace. 3913 if (R.getAsSingle<NamespaceDecl>()) { 3914 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3915 << SS.getRange(); 3916 UD->setInvalidDecl(); 3917 return UD; 3918 } 3919 3920 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3921 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3922 BuildUsingShadowDecl(S, UD, *I); 3923 } 3924 3925 return UD; 3926} 3927 3928/// Checks that the given using declaration is not an invalid 3929/// redeclaration. Note that this is checking only for the using decl 3930/// itself, not for any ill-formedness among the UsingShadowDecls. 3931bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3932 bool isTypeName, 3933 const CXXScopeSpec &SS, 3934 SourceLocation NameLoc, 3935 const LookupResult &Prev) { 3936 // C++03 [namespace.udecl]p8: 3937 // C++0x [namespace.udecl]p10: 3938 // A using-declaration is a declaration and can therefore be used 3939 // repeatedly where (and only where) multiple declarations are 3940 // allowed. 3941 // 3942 // That's in non-member contexts. 3943 if (!CurContext->getLookupContext()->isRecord()) 3944 return false; 3945 3946 NestedNameSpecifier *Qual 3947 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3948 3949 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3950 NamedDecl *D = *I; 3951 3952 bool DTypename; 3953 NestedNameSpecifier *DQual; 3954 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3955 DTypename = UD->isTypeName(); 3956 DQual = UD->getTargetNestedNameDecl(); 3957 } else if (UnresolvedUsingValueDecl *UD 3958 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3959 DTypename = false; 3960 DQual = UD->getTargetNestedNameSpecifier(); 3961 } else if (UnresolvedUsingTypenameDecl *UD 3962 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3963 DTypename = true; 3964 DQual = UD->getTargetNestedNameSpecifier(); 3965 } else continue; 3966 3967 // using decls differ if one says 'typename' and the other doesn't. 3968 // FIXME: non-dependent using decls? 3969 if (isTypeName != DTypename) continue; 3970 3971 // using decls differ if they name different scopes (but note that 3972 // template instantiation can cause this check to trigger when it 3973 // didn't before instantiation). 3974 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3975 Context.getCanonicalNestedNameSpecifier(DQual)) 3976 continue; 3977 3978 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3979 Diag(D->getLocation(), diag::note_using_decl) << 1; 3980 return true; 3981 } 3982 3983 return false; 3984} 3985 3986 3987/// Checks that the given nested-name qualifier used in a using decl 3988/// in the current context is appropriately related to the current 3989/// scope. If an error is found, diagnoses it and returns true. 3990bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3991 const CXXScopeSpec &SS, 3992 SourceLocation NameLoc) { 3993 DeclContext *NamedContext = computeDeclContext(SS); 3994 3995 if (!CurContext->isRecord()) { 3996 // C++03 [namespace.udecl]p3: 3997 // C++0x [namespace.udecl]p8: 3998 // A using-declaration for a class member shall be a member-declaration. 3999 4000 // If we weren't able to compute a valid scope, it must be a 4001 // dependent class scope. 4002 if (!NamedContext || NamedContext->isRecord()) { 4003 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4004 << SS.getRange(); 4005 return true; 4006 } 4007 4008 // Otherwise, everything is known to be fine. 4009 return false; 4010 } 4011 4012 // The current scope is a record. 4013 4014 // If the named context is dependent, we can't decide much. 4015 if (!NamedContext) { 4016 // FIXME: in C++0x, we can diagnose if we can prove that the 4017 // nested-name-specifier does not refer to a base class, which is 4018 // still possible in some cases. 4019 4020 // Otherwise we have to conservatively report that things might be 4021 // okay. 4022 return false; 4023 } 4024 4025 if (!NamedContext->isRecord()) { 4026 // Ideally this would point at the last name in the specifier, 4027 // but we don't have that level of source info. 4028 Diag(SS.getRange().getBegin(), 4029 diag::err_using_decl_nested_name_specifier_is_not_class) 4030 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4031 return true; 4032 } 4033 4034 if (getLangOptions().CPlusPlus0x) { 4035 // C++0x [namespace.udecl]p3: 4036 // In a using-declaration used as a member-declaration, the 4037 // nested-name-specifier shall name a base class of the class 4038 // being defined. 4039 4040 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4041 cast<CXXRecordDecl>(NamedContext))) { 4042 if (CurContext == NamedContext) { 4043 Diag(NameLoc, 4044 diag::err_using_decl_nested_name_specifier_is_current_class) 4045 << SS.getRange(); 4046 return true; 4047 } 4048 4049 Diag(SS.getRange().getBegin(), 4050 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4051 << (NestedNameSpecifier*) SS.getScopeRep() 4052 << cast<CXXRecordDecl>(CurContext) 4053 << SS.getRange(); 4054 return true; 4055 } 4056 4057 return false; 4058 } 4059 4060 // C++03 [namespace.udecl]p4: 4061 // A using-declaration used as a member-declaration shall refer 4062 // to a member of a base class of the class being defined [etc.]. 4063 4064 // Salient point: SS doesn't have to name a base class as long as 4065 // lookup only finds members from base classes. Therefore we can 4066 // diagnose here only if we can prove that that can't happen, 4067 // i.e. if the class hierarchies provably don't intersect. 4068 4069 // TODO: it would be nice if "definitely valid" results were cached 4070 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4071 // need to be repeated. 4072 4073 struct UserData { 4074 llvm::DenseSet<const CXXRecordDecl*> Bases; 4075 4076 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4077 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4078 Data->Bases.insert(Base); 4079 return true; 4080 } 4081 4082 bool hasDependentBases(const CXXRecordDecl *Class) { 4083 return !Class->forallBases(collect, this); 4084 } 4085 4086 /// Returns true if the base is dependent or is one of the 4087 /// accumulated base classes. 4088 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4089 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4090 return !Data->Bases.count(Base); 4091 } 4092 4093 bool mightShareBases(const CXXRecordDecl *Class) { 4094 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4095 } 4096 }; 4097 4098 UserData Data; 4099 4100 // Returns false if we find a dependent base. 4101 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4102 return false; 4103 4104 // Returns false if the class has a dependent base or if it or one 4105 // of its bases is present in the base set of the current context. 4106 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4107 return false; 4108 4109 Diag(SS.getRange().getBegin(), 4110 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4111 << (NestedNameSpecifier*) SS.getScopeRep() 4112 << cast<CXXRecordDecl>(CurContext) 4113 << SS.getRange(); 4114 4115 return true; 4116} 4117 4118Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4119 SourceLocation NamespaceLoc, 4120 SourceLocation AliasLoc, 4121 IdentifierInfo *Alias, 4122 CXXScopeSpec &SS, 4123 SourceLocation IdentLoc, 4124 IdentifierInfo *Ident) { 4125 4126 // Lookup the namespace name. 4127 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4128 LookupParsedName(R, S, &SS); 4129 4130 // Check if we have a previous declaration with the same name. 4131 NamedDecl *PrevDecl 4132 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4133 ForRedeclaration); 4134 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4135 PrevDecl = 0; 4136 4137 if (PrevDecl) { 4138 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4139 // We already have an alias with the same name that points to the same 4140 // namespace, so don't create a new one. 4141 // FIXME: At some point, we'll want to create the (redundant) 4142 // declaration to maintain better source information. 4143 if (!R.isAmbiguous() && !R.empty() && 4144 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4145 return DeclPtrTy(); 4146 } 4147 4148 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4149 diag::err_redefinition_different_kind; 4150 Diag(AliasLoc, DiagID) << Alias; 4151 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4152 return DeclPtrTy(); 4153 } 4154 4155 if (R.isAmbiguous()) 4156 return DeclPtrTy(); 4157 4158 if (R.empty()) { 4159 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4160 return DeclPtrTy(); 4161 } 4162 4163 NamespaceAliasDecl *AliasDecl = 4164 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4165 Alias, SS.getRange(), 4166 (NestedNameSpecifier *)SS.getScopeRep(), 4167 IdentLoc, R.getFoundDecl()); 4168 4169 PushOnScopeChains(AliasDecl, S); 4170 return DeclPtrTy::make(AliasDecl); 4171} 4172 4173namespace { 4174 /// \brief Scoped object used to handle the state changes required in Sema 4175 /// to implicitly define the body of a C++ member function; 4176 class ImplicitlyDefinedFunctionScope { 4177 Sema &S; 4178 DeclContext *PreviousContext; 4179 4180 public: 4181 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4182 : S(S), PreviousContext(S.CurContext) 4183 { 4184 S.CurContext = Method; 4185 S.PushFunctionScope(); 4186 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4187 } 4188 4189 ~ImplicitlyDefinedFunctionScope() { 4190 S.PopExpressionEvaluationContext(); 4191 S.PopFunctionOrBlockScope(); 4192 S.CurContext = PreviousContext; 4193 } 4194 }; 4195} 4196 4197void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4198 CXXConstructorDecl *Constructor) { 4199 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4200 !Constructor->isUsed()) && 4201 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4202 4203 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4204 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4205 4206 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4207 ErrorTrap Trap(*this); 4208 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4209 Trap.hasErrorOccurred()) { 4210 Diag(CurrentLocation, diag::note_member_synthesized_at) 4211 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4212 Constructor->setInvalidDecl(); 4213 } else { 4214 Constructor->setUsed(); 4215 MarkVTableUsed(CurrentLocation, ClassDecl); 4216 } 4217} 4218 4219void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4220 CXXDestructorDecl *Destructor) { 4221 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4222 "DefineImplicitDestructor - call it for implicit default dtor"); 4223 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4224 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4225 4226 if (Destructor->isInvalidDecl()) 4227 return; 4228 4229 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4230 4231 ErrorTrap Trap(*this); 4232 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4233 Destructor->getParent()); 4234 4235 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4236 Diag(CurrentLocation, diag::note_member_synthesized_at) 4237 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4238 4239 Destructor->setInvalidDecl(); 4240 return; 4241 } 4242 4243 Destructor->setUsed(); 4244 MarkVTableUsed(CurrentLocation, ClassDecl); 4245} 4246 4247/// \brief Builds a statement that copies the given entity from \p From to 4248/// \c To. 4249/// 4250/// This routine is used to copy the members of a class with an 4251/// implicitly-declared copy assignment operator. When the entities being 4252/// copied are arrays, this routine builds for loops to copy them. 4253/// 4254/// \param S The Sema object used for type-checking. 4255/// 4256/// \param Loc The location where the implicit copy is being generated. 4257/// 4258/// \param T The type of the expressions being copied. Both expressions must 4259/// have this type. 4260/// 4261/// \param To The expression we are copying to. 4262/// 4263/// \param From The expression we are copying from. 4264/// 4265/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4266/// Otherwise, it's a non-static member subobject. 4267/// 4268/// \param Depth Internal parameter recording the depth of the recursion. 4269/// 4270/// \returns A statement or a loop that copies the expressions. 4271static Sema::OwningStmtResult 4272BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4273 Sema::OwningExprResult To, Sema::OwningExprResult From, 4274 bool CopyingBaseSubobject, unsigned Depth = 0) { 4275 typedef Sema::OwningStmtResult OwningStmtResult; 4276 typedef Sema::OwningExprResult OwningExprResult; 4277 4278 // C++0x [class.copy]p30: 4279 // Each subobject is assigned in the manner appropriate to its type: 4280 // 4281 // - if the subobject is of class type, the copy assignment operator 4282 // for the class is used (as if by explicit qualification; that is, 4283 // ignoring any possible virtual overriding functions in more derived 4284 // classes); 4285 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4286 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4287 4288 // Look for operator=. 4289 DeclarationName Name 4290 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4291 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4292 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4293 4294 // Filter out any result that isn't a copy-assignment operator. 4295 LookupResult::Filter F = OpLookup.makeFilter(); 4296 while (F.hasNext()) { 4297 NamedDecl *D = F.next(); 4298 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4299 if (Method->isCopyAssignmentOperator()) 4300 continue; 4301 4302 F.erase(); 4303 } 4304 F.done(); 4305 4306 // Suppress the protected check (C++ [class.protected]) for each of the 4307 // assignment operators we found. This strange dance is required when 4308 // we're assigning via a base classes's copy-assignment operator. To 4309 // ensure that we're getting the right base class subobject (without 4310 // ambiguities), we need to cast "this" to that subobject type; to 4311 // ensure that we don't go through the virtual call mechanism, we need 4312 // to qualify the operator= name with the base class (see below). However, 4313 // this means that if the base class has a protected copy assignment 4314 // operator, the protected member access check will fail. So, we 4315 // rewrite "protected" access to "public" access in this case, since we 4316 // know by construction that we're calling from a derived class. 4317 if (CopyingBaseSubobject) { 4318 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4319 L != LEnd; ++L) { 4320 if (L.getAccess() == AS_protected) 4321 L.setAccess(AS_public); 4322 } 4323 } 4324 4325 // Create the nested-name-specifier that will be used to qualify the 4326 // reference to operator=; this is required to suppress the virtual 4327 // call mechanism. 4328 CXXScopeSpec SS; 4329 SS.setRange(Loc); 4330 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4331 T.getTypePtr())); 4332 4333 // Create the reference to operator=. 4334 OwningExprResult OpEqualRef 4335 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4336 /*FirstQualifierInScope=*/0, OpLookup, 4337 /*TemplateArgs=*/0, 4338 /*SuppressQualifierCheck=*/true); 4339 if (OpEqualRef.isInvalid()) 4340 return S.StmtError(); 4341 4342 // Build the call to the assignment operator. 4343 Expr *FromE = From.takeAs<Expr>(); 4344 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4345 OpEqualRef.takeAs<Expr>(), 4346 Loc, &FromE, 1, 0, Loc); 4347 if (Call.isInvalid()) 4348 return S.StmtError(); 4349 4350 return S.Owned(Call.takeAs<Stmt>()); 4351 } 4352 4353 // - if the subobject is of scalar type, the built-in assignment 4354 // operator is used. 4355 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4356 if (!ArrayTy) { 4357 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4358 BinaryOperator::Assign, 4359 To.takeAs<Expr>(), 4360 From.takeAs<Expr>()); 4361 if (Assignment.isInvalid()) 4362 return S.StmtError(); 4363 4364 return S.Owned(Assignment.takeAs<Stmt>()); 4365 } 4366 4367 // - if the subobject is an array, each element is assigned, in the 4368 // manner appropriate to the element type; 4369 4370 // Construct a loop over the array bounds, e.g., 4371 // 4372 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4373 // 4374 // that will copy each of the array elements. 4375 QualType SizeType = S.Context.getSizeType(); 4376 4377 // Create the iteration variable. 4378 IdentifierInfo *IterationVarName = 0; 4379 { 4380 llvm::SmallString<8> Str; 4381 llvm::raw_svector_ostream OS(Str); 4382 OS << "__i" << Depth; 4383 IterationVarName = &S.Context.Idents.get(OS.str()); 4384 } 4385 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4386 IterationVarName, SizeType, 4387 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4388 VarDecl::None, VarDecl::None); 4389 4390 // Initialize the iteration variable to zero. 4391 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4392 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4393 4394 // Create a reference to the iteration variable; we'll use this several 4395 // times throughout. 4396 Expr *IterationVarRef 4397 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4398 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4399 4400 // Create the DeclStmt that holds the iteration variable. 4401 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4402 4403 // Create the comparison against the array bound. 4404 llvm::APInt Upper = ArrayTy->getSize(); 4405 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4406 OwningExprResult Comparison 4407 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4408 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4409 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4410 4411 // Create the pre-increment of the iteration variable. 4412 OwningExprResult Increment 4413 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4414 UnaryOperator::PreInc, 4415 SizeType, Loc)); 4416 4417 // Subscript the "from" and "to" expressions with the iteration variable. 4418 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4419 S.Owned(IterationVarRef->Retain()), 4420 Loc); 4421 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4422 S.Owned(IterationVarRef->Retain()), 4423 Loc); 4424 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4425 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4426 4427 // Build the copy for an individual element of the array. 4428 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4429 ArrayTy->getElementType(), 4430 move(To), move(From), 4431 CopyingBaseSubobject, Depth+1); 4432 if (Copy.isInvalid()) { 4433 InitStmt->Destroy(S.Context); 4434 return S.StmtError(); 4435 } 4436 4437 // Construct the loop that copies all elements of this array. 4438 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4439 S.MakeFullExpr(Comparison), 4440 Sema::DeclPtrTy(), 4441 S.MakeFullExpr(Increment), 4442 Loc, move(Copy)); 4443} 4444 4445void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4446 CXXMethodDecl *CopyAssignOperator) { 4447 assert((CopyAssignOperator->isImplicit() && 4448 CopyAssignOperator->isOverloadedOperator() && 4449 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4450 !CopyAssignOperator->isUsed()) && 4451 "DefineImplicitCopyAssignment called for wrong function"); 4452 4453 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4454 4455 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4456 CopyAssignOperator->setInvalidDecl(); 4457 return; 4458 } 4459 4460 CopyAssignOperator->setUsed(); 4461 4462 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4463 ErrorTrap Trap(*this); 4464 4465 // C++0x [class.copy]p30: 4466 // The implicitly-defined or explicitly-defaulted copy assignment operator 4467 // for a non-union class X performs memberwise copy assignment of its 4468 // subobjects. The direct base classes of X are assigned first, in the 4469 // order of their declaration in the base-specifier-list, and then the 4470 // immediate non-static data members of X are assigned, in the order in 4471 // which they were declared in the class definition. 4472 4473 // The statements that form the synthesized function body. 4474 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4475 4476 // The parameter for the "other" object, which we are copying from. 4477 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4478 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4479 QualType OtherRefType = Other->getType(); 4480 if (const LValueReferenceType *OtherRef 4481 = OtherRefType->getAs<LValueReferenceType>()) { 4482 OtherRefType = OtherRef->getPointeeType(); 4483 OtherQuals = OtherRefType.getQualifiers(); 4484 } 4485 4486 // Our location for everything implicitly-generated. 4487 SourceLocation Loc = CopyAssignOperator->getLocation(); 4488 4489 // Construct a reference to the "other" object. We'll be using this 4490 // throughout the generated ASTs. 4491 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4492 assert(OtherRef && "Reference to parameter cannot fail!"); 4493 4494 // Construct the "this" pointer. We'll be using this throughout the generated 4495 // ASTs. 4496 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4497 assert(This && "Reference to this cannot fail!"); 4498 4499 // Assign base classes. 4500 bool Invalid = false; 4501 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4502 E = ClassDecl->bases_end(); Base != E; ++Base) { 4503 // Form the assignment: 4504 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4505 QualType BaseType = Base->getType().getUnqualifiedType(); 4506 CXXRecordDecl *BaseClassDecl = 0; 4507 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4508 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4509 else { 4510 Invalid = true; 4511 continue; 4512 } 4513 4514 // Construct the "from" expression, which is an implicit cast to the 4515 // appropriately-qualified base type. 4516 Expr *From = OtherRef->Retain(); 4517 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4518 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4519 CXXBaseSpecifierArray(Base)); 4520 4521 // Dereference "this". 4522 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4523 Owned(This->Retain())); 4524 4525 // Implicitly cast "this" to the appropriately-qualified base type. 4526 Expr *ToE = To.takeAs<Expr>(); 4527 ImpCastExprToType(ToE, 4528 Context.getCVRQualifiedType(BaseType, 4529 CopyAssignOperator->getTypeQualifiers()), 4530 CastExpr::CK_UncheckedDerivedToBase, 4531 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4532 To = Owned(ToE); 4533 4534 // Build the copy. 4535 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4536 move(To), Owned(From), 4537 /*CopyingBaseSubobject=*/true); 4538 if (Copy.isInvalid()) { 4539 Diag(CurrentLocation, diag::note_member_synthesized_at) 4540 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4541 CopyAssignOperator->setInvalidDecl(); 4542 return; 4543 } 4544 4545 // Success! Record the copy. 4546 Statements.push_back(Copy.takeAs<Expr>()); 4547 } 4548 4549 // \brief Reference to the __builtin_memcpy function. 4550 Expr *BuiltinMemCpyRef = 0; 4551 4552 // Assign non-static members. 4553 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4554 FieldEnd = ClassDecl->field_end(); 4555 Field != FieldEnd; ++Field) { 4556 // Check for members of reference type; we can't copy those. 4557 if (Field->getType()->isReferenceType()) { 4558 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4559 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4560 Diag(Field->getLocation(), diag::note_declared_at); 4561 Diag(CurrentLocation, diag::note_member_synthesized_at) 4562 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4563 Invalid = true; 4564 continue; 4565 } 4566 4567 // Check for members of const-qualified, non-class type. 4568 QualType BaseType = Context.getBaseElementType(Field->getType()); 4569 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4570 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4571 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4572 Diag(Field->getLocation(), diag::note_declared_at); 4573 Diag(CurrentLocation, diag::note_member_synthesized_at) 4574 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4575 Invalid = true; 4576 continue; 4577 } 4578 4579 QualType FieldType = Field->getType().getNonReferenceType(); 4580 4581 // Build references to the field in the object we're copying from and to. 4582 CXXScopeSpec SS; // Intentionally empty 4583 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4584 LookupMemberName); 4585 MemberLookup.addDecl(*Field); 4586 MemberLookup.resolveKind(); 4587 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4588 OtherRefType, 4589 Loc, /*IsArrow=*/false, 4590 SS, 0, MemberLookup, 0); 4591 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4592 This->getType(), 4593 Loc, /*IsArrow=*/true, 4594 SS, 0, MemberLookup, 0); 4595 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4596 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4597 4598 // If the field should be copied with __builtin_memcpy rather than via 4599 // explicit assignments, do so. This optimization only applies for arrays 4600 // of scalars and arrays of class type with trivial copy-assignment 4601 // operators. 4602 if (FieldType->isArrayType() && 4603 (!BaseType->isRecordType() || 4604 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4605 ->hasTrivialCopyAssignment())) { 4606 // Compute the size of the memory buffer to be copied. 4607 QualType SizeType = Context.getSizeType(); 4608 llvm::APInt Size(Context.getTypeSize(SizeType), 4609 Context.getTypeSizeInChars(BaseType).getQuantity()); 4610 for (const ConstantArrayType *Array 4611 = Context.getAsConstantArrayType(FieldType); 4612 Array; 4613 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4614 llvm::APInt ArraySize = Array->getSize(); 4615 ArraySize.zextOrTrunc(Size.getBitWidth()); 4616 Size *= ArraySize; 4617 } 4618 4619 // Take the address of the field references for "from" and "to". 4620 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4621 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4622 4623 // Create a reference to the __builtin_memcpy builtin function. 4624 if (!BuiltinMemCpyRef) { 4625 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4626 LookupOrdinaryName); 4627 LookupName(R, TUScope, true); 4628 4629 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4630 if (!BuiltinMemCpy) { 4631 // Something went horribly wrong earlier, and we will have complained 4632 // about it. 4633 Invalid = true; 4634 continue; 4635 } 4636 4637 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4638 BuiltinMemCpy->getType(), 4639 Loc, 0).takeAs<Expr>(); 4640 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4641 } 4642 4643 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4644 CallArgs.push_back(To.takeAs<Expr>()); 4645 CallArgs.push_back(From.takeAs<Expr>()); 4646 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4647 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4648 Commas.push_back(Loc); 4649 Commas.push_back(Loc); 4650 OwningExprResult Call = ActOnCallExpr(/*Scope=*/0, 4651 Owned(BuiltinMemCpyRef->Retain()), 4652 Loc, move_arg(CallArgs), 4653 Commas.data(), Loc); 4654 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4655 Statements.push_back(Call.takeAs<Expr>()); 4656 continue; 4657 } 4658 4659 // Build the copy of this field. 4660 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4661 move(To), move(From), 4662 /*CopyingBaseSubobject=*/false); 4663 if (Copy.isInvalid()) { 4664 Diag(CurrentLocation, diag::note_member_synthesized_at) 4665 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4666 CopyAssignOperator->setInvalidDecl(); 4667 return; 4668 } 4669 4670 // Success! Record the copy. 4671 Statements.push_back(Copy.takeAs<Stmt>()); 4672 } 4673 4674 if (!Invalid) { 4675 // Add a "return *this;" 4676 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4677 Owned(This->Retain())); 4678 4679 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4680 if (Return.isInvalid()) 4681 Invalid = true; 4682 else { 4683 Statements.push_back(Return.takeAs<Stmt>()); 4684 4685 if (Trap.hasErrorOccurred()) { 4686 Diag(CurrentLocation, diag::note_member_synthesized_at) 4687 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4688 Invalid = true; 4689 } 4690 } 4691 } 4692 4693 if (Invalid) { 4694 CopyAssignOperator->setInvalidDecl(); 4695 return; 4696 } 4697 4698 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4699 /*isStmtExpr=*/false); 4700 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4701 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4702} 4703 4704void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4705 CXXConstructorDecl *CopyConstructor, 4706 unsigned TypeQuals) { 4707 assert((CopyConstructor->isImplicit() && 4708 CopyConstructor->isCopyConstructor(TypeQuals) && 4709 !CopyConstructor->isUsed()) && 4710 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4711 4712 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4713 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4714 4715 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4716 ErrorTrap Trap(*this); 4717 4718 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4719 Trap.hasErrorOccurred()) { 4720 Diag(CurrentLocation, diag::note_member_synthesized_at) 4721 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4722 CopyConstructor->setInvalidDecl(); 4723 } else { 4724 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4725 CopyConstructor->getLocation(), 4726 MultiStmtArg(*this, 0, 0), 4727 /*isStmtExpr=*/false) 4728 .takeAs<Stmt>()); 4729 } 4730 4731 CopyConstructor->setUsed(); 4732} 4733 4734Sema::OwningExprResult 4735Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4736 CXXConstructorDecl *Constructor, 4737 MultiExprArg ExprArgs, 4738 bool RequiresZeroInit, 4739 CXXConstructExpr::ConstructionKind ConstructKind) { 4740 bool Elidable = false; 4741 4742 // C++0x [class.copy]p34: 4743 // When certain criteria are met, an implementation is allowed to 4744 // omit the copy/move construction of a class object, even if the 4745 // copy/move constructor and/or destructor for the object have 4746 // side effects. [...] 4747 // - when a temporary class object that has not been bound to a 4748 // reference (12.2) would be copied/moved to a class object 4749 // with the same cv-unqualified type, the copy/move operation 4750 // can be omitted by constructing the temporary object 4751 // directly into the target of the omitted copy/move 4752 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4753 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4754 Elidable = SubExpr->isTemporaryObject() && 4755 Context.hasSameUnqualifiedType(SubExpr->getType(), 4756 Context.getTypeDeclType(Constructor->getParent())); 4757 } 4758 4759 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4760 Elidable, move(ExprArgs), RequiresZeroInit, 4761 ConstructKind); 4762} 4763 4764/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4765/// including handling of its default argument expressions. 4766Sema::OwningExprResult 4767Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4768 CXXConstructorDecl *Constructor, bool Elidable, 4769 MultiExprArg ExprArgs, 4770 bool RequiresZeroInit, 4771 CXXConstructExpr::ConstructionKind ConstructKind) { 4772 unsigned NumExprs = ExprArgs.size(); 4773 Expr **Exprs = (Expr **)ExprArgs.release(); 4774 4775 MarkDeclarationReferenced(ConstructLoc, Constructor); 4776 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4777 Constructor, Elidable, Exprs, NumExprs, 4778 RequiresZeroInit, ConstructKind)); 4779} 4780 4781bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4782 CXXConstructorDecl *Constructor, 4783 MultiExprArg Exprs) { 4784 OwningExprResult TempResult = 4785 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4786 move(Exprs)); 4787 if (TempResult.isInvalid()) 4788 return true; 4789 4790 Expr *Temp = TempResult.takeAs<Expr>(); 4791 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4792 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4793 VD->setInit(Temp); 4794 4795 return false; 4796} 4797 4798void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4799 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4800 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4801 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 4802 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4803 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4804 CheckDestructorAccess(VD->getLocation(), Destructor, 4805 PDiag(diag::err_access_dtor_var) 4806 << VD->getDeclName() 4807 << VD->getType()); 4808 } 4809} 4810 4811/// AddCXXDirectInitializerToDecl - This action is called immediately after 4812/// ActOnDeclarator, when a C++ direct initializer is present. 4813/// e.g: "int x(1);" 4814void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4815 SourceLocation LParenLoc, 4816 MultiExprArg Exprs, 4817 SourceLocation *CommaLocs, 4818 SourceLocation RParenLoc) { 4819 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4820 Decl *RealDecl = Dcl.getAs<Decl>(); 4821 4822 // If there is no declaration, there was an error parsing it. Just ignore 4823 // the initializer. 4824 if (RealDecl == 0) 4825 return; 4826 4827 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4828 if (!VDecl) { 4829 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4830 RealDecl->setInvalidDecl(); 4831 return; 4832 } 4833 4834 // We will represent direct-initialization similarly to copy-initialization: 4835 // int x(1); -as-> int x = 1; 4836 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4837 // 4838 // Clients that want to distinguish between the two forms, can check for 4839 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4840 // A major benefit is that clients that don't particularly care about which 4841 // exactly form was it (like the CodeGen) can handle both cases without 4842 // special case code. 4843 4844 // C++ 8.5p11: 4845 // The form of initialization (using parentheses or '=') is generally 4846 // insignificant, but does matter when the entity being initialized has a 4847 // class type. 4848 QualType DeclInitType = VDecl->getType(); 4849 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4850 DeclInitType = Context.getBaseElementType(Array); 4851 4852 if (!VDecl->getType()->isDependentType() && 4853 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4854 diag::err_typecheck_decl_incomplete_type)) { 4855 VDecl->setInvalidDecl(); 4856 return; 4857 } 4858 4859 // The variable can not have an abstract class type. 4860 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4861 diag::err_abstract_type_in_decl, 4862 AbstractVariableType)) 4863 VDecl->setInvalidDecl(); 4864 4865 const VarDecl *Def; 4866 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4867 Diag(VDecl->getLocation(), diag::err_redefinition) 4868 << VDecl->getDeclName(); 4869 Diag(Def->getLocation(), diag::note_previous_definition); 4870 VDecl->setInvalidDecl(); 4871 return; 4872 } 4873 4874 // If either the declaration has a dependent type or if any of the 4875 // expressions is type-dependent, we represent the initialization 4876 // via a ParenListExpr for later use during template instantiation. 4877 if (VDecl->getType()->isDependentType() || 4878 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4879 // Let clients know that initialization was done with a direct initializer. 4880 VDecl->setCXXDirectInitializer(true); 4881 4882 // Store the initialization expressions as a ParenListExpr. 4883 unsigned NumExprs = Exprs.size(); 4884 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4885 (Expr **)Exprs.release(), 4886 NumExprs, RParenLoc)); 4887 return; 4888 } 4889 4890 // Capture the variable that is being initialized and the style of 4891 // initialization. 4892 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4893 4894 // FIXME: Poor source location information. 4895 InitializationKind Kind 4896 = InitializationKind::CreateDirect(VDecl->getLocation(), 4897 LParenLoc, RParenLoc); 4898 4899 InitializationSequence InitSeq(*this, Entity, Kind, 4900 (Expr**)Exprs.get(), Exprs.size()); 4901 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4902 if (Result.isInvalid()) { 4903 VDecl->setInvalidDecl(); 4904 return; 4905 } 4906 4907 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4908 VDecl->setInit(Result.takeAs<Expr>()); 4909 VDecl->setCXXDirectInitializer(true); 4910 4911 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4912 FinalizeVarWithDestructor(VDecl, Record); 4913} 4914 4915/// \brief Given a constructor and the set of arguments provided for the 4916/// constructor, convert the arguments and add any required default arguments 4917/// to form a proper call to this constructor. 4918/// 4919/// \returns true if an error occurred, false otherwise. 4920bool 4921Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4922 MultiExprArg ArgsPtr, 4923 SourceLocation Loc, 4924 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4925 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4926 unsigned NumArgs = ArgsPtr.size(); 4927 Expr **Args = (Expr **)ArgsPtr.get(); 4928 4929 const FunctionProtoType *Proto 4930 = Constructor->getType()->getAs<FunctionProtoType>(); 4931 assert(Proto && "Constructor without a prototype?"); 4932 unsigned NumArgsInProto = Proto->getNumArgs(); 4933 4934 // If too few arguments are available, we'll fill in the rest with defaults. 4935 if (NumArgs < NumArgsInProto) 4936 ConvertedArgs.reserve(NumArgsInProto); 4937 else 4938 ConvertedArgs.reserve(NumArgs); 4939 4940 VariadicCallType CallType = 4941 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4942 llvm::SmallVector<Expr *, 8> AllArgs; 4943 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4944 Proto, 0, Args, NumArgs, AllArgs, 4945 CallType); 4946 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4947 ConvertedArgs.push_back(AllArgs[i]); 4948 return Invalid; 4949} 4950 4951static inline bool 4952CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4953 const FunctionDecl *FnDecl) { 4954 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4955 if (isa<NamespaceDecl>(DC)) { 4956 return SemaRef.Diag(FnDecl->getLocation(), 4957 diag::err_operator_new_delete_declared_in_namespace) 4958 << FnDecl->getDeclName(); 4959 } 4960 4961 if (isa<TranslationUnitDecl>(DC) && 4962 FnDecl->getStorageClass() == FunctionDecl::Static) { 4963 return SemaRef.Diag(FnDecl->getLocation(), 4964 diag::err_operator_new_delete_declared_static) 4965 << FnDecl->getDeclName(); 4966 } 4967 4968 return false; 4969} 4970 4971static inline bool 4972CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4973 CanQualType ExpectedResultType, 4974 CanQualType ExpectedFirstParamType, 4975 unsigned DependentParamTypeDiag, 4976 unsigned InvalidParamTypeDiag) { 4977 QualType ResultType = 4978 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4979 4980 // Check that the result type is not dependent. 4981 if (ResultType->isDependentType()) 4982 return SemaRef.Diag(FnDecl->getLocation(), 4983 diag::err_operator_new_delete_dependent_result_type) 4984 << FnDecl->getDeclName() << ExpectedResultType; 4985 4986 // Check that the result type is what we expect. 4987 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4988 return SemaRef.Diag(FnDecl->getLocation(), 4989 diag::err_operator_new_delete_invalid_result_type) 4990 << FnDecl->getDeclName() << ExpectedResultType; 4991 4992 // A function template must have at least 2 parameters. 4993 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4994 return SemaRef.Diag(FnDecl->getLocation(), 4995 diag::err_operator_new_delete_template_too_few_parameters) 4996 << FnDecl->getDeclName(); 4997 4998 // The function decl must have at least 1 parameter. 4999 if (FnDecl->getNumParams() == 0) 5000 return SemaRef.Diag(FnDecl->getLocation(), 5001 diag::err_operator_new_delete_too_few_parameters) 5002 << FnDecl->getDeclName(); 5003 5004 // Check the the first parameter type is not dependent. 5005 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5006 if (FirstParamType->isDependentType()) 5007 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5008 << FnDecl->getDeclName() << ExpectedFirstParamType; 5009 5010 // Check that the first parameter type is what we expect. 5011 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5012 ExpectedFirstParamType) 5013 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5014 << FnDecl->getDeclName() << ExpectedFirstParamType; 5015 5016 return false; 5017} 5018 5019static bool 5020CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5021 // C++ [basic.stc.dynamic.allocation]p1: 5022 // A program is ill-formed if an allocation function is declared in a 5023 // namespace scope other than global scope or declared static in global 5024 // scope. 5025 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5026 return true; 5027 5028 CanQualType SizeTy = 5029 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5030 5031 // C++ [basic.stc.dynamic.allocation]p1: 5032 // The return type shall be void*. The first parameter shall have type 5033 // std::size_t. 5034 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5035 SizeTy, 5036 diag::err_operator_new_dependent_param_type, 5037 diag::err_operator_new_param_type)) 5038 return true; 5039 5040 // C++ [basic.stc.dynamic.allocation]p1: 5041 // The first parameter shall not have an associated default argument. 5042 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5043 return SemaRef.Diag(FnDecl->getLocation(), 5044 diag::err_operator_new_default_arg) 5045 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5046 5047 return false; 5048} 5049 5050static bool 5051CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5052 // C++ [basic.stc.dynamic.deallocation]p1: 5053 // A program is ill-formed if deallocation functions are declared in a 5054 // namespace scope other than global scope or declared static in global 5055 // scope. 5056 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5057 return true; 5058 5059 // C++ [basic.stc.dynamic.deallocation]p2: 5060 // Each deallocation function shall return void and its first parameter 5061 // shall be void*. 5062 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5063 SemaRef.Context.VoidPtrTy, 5064 diag::err_operator_delete_dependent_param_type, 5065 diag::err_operator_delete_param_type)) 5066 return true; 5067 5068 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5069 if (FirstParamType->isDependentType()) 5070 return SemaRef.Diag(FnDecl->getLocation(), 5071 diag::err_operator_delete_dependent_param_type) 5072 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5073 5074 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5075 SemaRef.Context.VoidPtrTy) 5076 return SemaRef.Diag(FnDecl->getLocation(), 5077 diag::err_operator_delete_param_type) 5078 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5079 5080 return false; 5081} 5082 5083/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5084/// of this overloaded operator is well-formed. If so, returns false; 5085/// otherwise, emits appropriate diagnostics and returns true. 5086bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5087 assert(FnDecl && FnDecl->isOverloadedOperator() && 5088 "Expected an overloaded operator declaration"); 5089 5090 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5091 5092 // C++ [over.oper]p5: 5093 // The allocation and deallocation functions, operator new, 5094 // operator new[], operator delete and operator delete[], are 5095 // described completely in 3.7.3. The attributes and restrictions 5096 // found in the rest of this subclause do not apply to them unless 5097 // explicitly stated in 3.7.3. 5098 if (Op == OO_Delete || Op == OO_Array_Delete) 5099 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5100 5101 if (Op == OO_New || Op == OO_Array_New) 5102 return CheckOperatorNewDeclaration(*this, FnDecl); 5103 5104 // C++ [over.oper]p6: 5105 // An operator function shall either be a non-static member 5106 // function or be a non-member function and have at least one 5107 // parameter whose type is a class, a reference to a class, an 5108 // enumeration, or a reference to an enumeration. 5109 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5110 if (MethodDecl->isStatic()) 5111 return Diag(FnDecl->getLocation(), 5112 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5113 } else { 5114 bool ClassOrEnumParam = false; 5115 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5116 ParamEnd = FnDecl->param_end(); 5117 Param != ParamEnd; ++Param) { 5118 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5119 if (ParamType->isDependentType() || ParamType->isRecordType() || 5120 ParamType->isEnumeralType()) { 5121 ClassOrEnumParam = true; 5122 break; 5123 } 5124 } 5125 5126 if (!ClassOrEnumParam) 5127 return Diag(FnDecl->getLocation(), 5128 diag::err_operator_overload_needs_class_or_enum) 5129 << FnDecl->getDeclName(); 5130 } 5131 5132 // C++ [over.oper]p8: 5133 // An operator function cannot have default arguments (8.3.6), 5134 // except where explicitly stated below. 5135 // 5136 // Only the function-call operator allows default arguments 5137 // (C++ [over.call]p1). 5138 if (Op != OO_Call) { 5139 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5140 Param != FnDecl->param_end(); ++Param) { 5141 if ((*Param)->hasDefaultArg()) 5142 return Diag((*Param)->getLocation(), 5143 diag::err_operator_overload_default_arg) 5144 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5145 } 5146 } 5147 5148 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5149 { false, false, false } 5150#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5151 , { Unary, Binary, MemberOnly } 5152#include "clang/Basic/OperatorKinds.def" 5153 }; 5154 5155 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5156 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5157 bool MustBeMemberOperator = OperatorUses[Op][2]; 5158 5159 // C++ [over.oper]p8: 5160 // [...] Operator functions cannot have more or fewer parameters 5161 // than the number required for the corresponding operator, as 5162 // described in the rest of this subclause. 5163 unsigned NumParams = FnDecl->getNumParams() 5164 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5165 if (Op != OO_Call && 5166 ((NumParams == 1 && !CanBeUnaryOperator) || 5167 (NumParams == 2 && !CanBeBinaryOperator) || 5168 (NumParams < 1) || (NumParams > 2))) { 5169 // We have the wrong number of parameters. 5170 unsigned ErrorKind; 5171 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5172 ErrorKind = 2; // 2 -> unary or binary. 5173 } else if (CanBeUnaryOperator) { 5174 ErrorKind = 0; // 0 -> unary 5175 } else { 5176 assert(CanBeBinaryOperator && 5177 "All non-call overloaded operators are unary or binary!"); 5178 ErrorKind = 1; // 1 -> binary 5179 } 5180 5181 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5182 << FnDecl->getDeclName() << NumParams << ErrorKind; 5183 } 5184 5185 // Overloaded operators other than operator() cannot be variadic. 5186 if (Op != OO_Call && 5187 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5188 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5189 << FnDecl->getDeclName(); 5190 } 5191 5192 // Some operators must be non-static member functions. 5193 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5194 return Diag(FnDecl->getLocation(), 5195 diag::err_operator_overload_must_be_member) 5196 << FnDecl->getDeclName(); 5197 } 5198 5199 // C++ [over.inc]p1: 5200 // The user-defined function called operator++ implements the 5201 // prefix and postfix ++ operator. If this function is a member 5202 // function with no parameters, or a non-member function with one 5203 // parameter of class or enumeration type, it defines the prefix 5204 // increment operator ++ for objects of that type. If the function 5205 // is a member function with one parameter (which shall be of type 5206 // int) or a non-member function with two parameters (the second 5207 // of which shall be of type int), it defines the postfix 5208 // increment operator ++ for objects of that type. 5209 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5210 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5211 bool ParamIsInt = false; 5212 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5213 ParamIsInt = BT->getKind() == BuiltinType::Int; 5214 5215 if (!ParamIsInt) 5216 return Diag(LastParam->getLocation(), 5217 diag::err_operator_overload_post_incdec_must_be_int) 5218 << LastParam->getType() << (Op == OO_MinusMinus); 5219 } 5220 5221 // Notify the class if it got an assignment operator. 5222 if (Op == OO_Equal) { 5223 // Would have returned earlier otherwise. 5224 assert(isa<CXXMethodDecl>(FnDecl) && 5225 "Overloaded = not member, but not filtered."); 5226 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5227 Method->getParent()->addedAssignmentOperator(Context, Method); 5228 } 5229 5230 return false; 5231} 5232 5233/// CheckLiteralOperatorDeclaration - Check whether the declaration 5234/// of this literal operator function is well-formed. If so, returns 5235/// false; otherwise, emits appropriate diagnostics and returns true. 5236bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5237 DeclContext *DC = FnDecl->getDeclContext(); 5238 Decl::Kind Kind = DC->getDeclKind(); 5239 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5240 Kind != Decl::LinkageSpec) { 5241 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5242 << FnDecl->getDeclName(); 5243 return true; 5244 } 5245 5246 bool Valid = false; 5247 5248 // template <char...> type operator "" name() is the only valid template 5249 // signature, and the only valid signature with no parameters. 5250 if (FnDecl->param_size() == 0) { 5251 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5252 // Must have only one template parameter 5253 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5254 if (Params->size() == 1) { 5255 NonTypeTemplateParmDecl *PmDecl = 5256 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5257 5258 // The template parameter must be a char parameter pack. 5259 // FIXME: This test will always fail because non-type parameter packs 5260 // have not been implemented. 5261 if (PmDecl && PmDecl->isTemplateParameterPack() && 5262 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5263 Valid = true; 5264 } 5265 } 5266 } else { 5267 // Check the first parameter 5268 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5269 5270 QualType T = (*Param)->getType(); 5271 5272 // unsigned long long int, long double, and any character type are allowed 5273 // as the only parameters. 5274 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5275 Context.hasSameType(T, Context.LongDoubleTy) || 5276 Context.hasSameType(T, Context.CharTy) || 5277 Context.hasSameType(T, Context.WCharTy) || 5278 Context.hasSameType(T, Context.Char16Ty) || 5279 Context.hasSameType(T, Context.Char32Ty)) { 5280 if (++Param == FnDecl->param_end()) 5281 Valid = true; 5282 goto FinishedParams; 5283 } 5284 5285 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5286 const PointerType *PT = T->getAs<PointerType>(); 5287 if (!PT) 5288 goto FinishedParams; 5289 T = PT->getPointeeType(); 5290 if (!T.isConstQualified()) 5291 goto FinishedParams; 5292 T = T.getUnqualifiedType(); 5293 5294 // Move on to the second parameter; 5295 ++Param; 5296 5297 // If there is no second parameter, the first must be a const char * 5298 if (Param == FnDecl->param_end()) { 5299 if (Context.hasSameType(T, Context.CharTy)) 5300 Valid = true; 5301 goto FinishedParams; 5302 } 5303 5304 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5305 // are allowed as the first parameter to a two-parameter function 5306 if (!(Context.hasSameType(T, Context.CharTy) || 5307 Context.hasSameType(T, Context.WCharTy) || 5308 Context.hasSameType(T, Context.Char16Ty) || 5309 Context.hasSameType(T, Context.Char32Ty))) 5310 goto FinishedParams; 5311 5312 // The second and final parameter must be an std::size_t 5313 T = (*Param)->getType().getUnqualifiedType(); 5314 if (Context.hasSameType(T, Context.getSizeType()) && 5315 ++Param == FnDecl->param_end()) 5316 Valid = true; 5317 } 5318 5319 // FIXME: This diagnostic is absolutely terrible. 5320FinishedParams: 5321 if (!Valid) { 5322 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5323 << FnDecl->getDeclName(); 5324 return true; 5325 } 5326 5327 return false; 5328} 5329 5330/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5331/// linkage specification, including the language and (if present) 5332/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5333/// the location of the language string literal, which is provided 5334/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5335/// the '{' brace. Otherwise, this linkage specification does not 5336/// have any braces. 5337Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5338 SourceLocation ExternLoc, 5339 SourceLocation LangLoc, 5340 llvm::StringRef Lang, 5341 SourceLocation LBraceLoc) { 5342 LinkageSpecDecl::LanguageIDs Language; 5343 if (Lang == "\"C\"") 5344 Language = LinkageSpecDecl::lang_c; 5345 else if (Lang == "\"C++\"") 5346 Language = LinkageSpecDecl::lang_cxx; 5347 else { 5348 Diag(LangLoc, diag::err_bad_language); 5349 return DeclPtrTy(); 5350 } 5351 5352 // FIXME: Add all the various semantics of linkage specifications 5353 5354 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5355 LangLoc, Language, 5356 LBraceLoc.isValid()); 5357 CurContext->addDecl(D); 5358 PushDeclContext(S, D); 5359 return DeclPtrTy::make(D); 5360} 5361 5362/// ActOnFinishLinkageSpecification - Completely the definition of 5363/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5364/// valid, it's the position of the closing '}' brace in a linkage 5365/// specification that uses braces. 5366Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5367 DeclPtrTy LinkageSpec, 5368 SourceLocation RBraceLoc) { 5369 if (LinkageSpec) 5370 PopDeclContext(); 5371 return LinkageSpec; 5372} 5373 5374/// \brief Perform semantic analysis for the variable declaration that 5375/// occurs within a C++ catch clause, returning the newly-created 5376/// variable. 5377VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5378 TypeSourceInfo *TInfo, 5379 IdentifierInfo *Name, 5380 SourceLocation Loc, 5381 SourceRange Range) { 5382 bool Invalid = false; 5383 5384 // Arrays and functions decay. 5385 if (ExDeclType->isArrayType()) 5386 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5387 else if (ExDeclType->isFunctionType()) 5388 ExDeclType = Context.getPointerType(ExDeclType); 5389 5390 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5391 // The exception-declaration shall not denote a pointer or reference to an 5392 // incomplete type, other than [cv] void*. 5393 // N2844 forbids rvalue references. 5394 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5395 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5396 Invalid = true; 5397 } 5398 5399 // GCC allows catching pointers and references to incomplete types 5400 // as an extension; so do we, but we warn by default. 5401 5402 QualType BaseType = ExDeclType; 5403 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5404 unsigned DK = diag::err_catch_incomplete; 5405 bool IncompleteCatchIsInvalid = true; 5406 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5407 BaseType = Ptr->getPointeeType(); 5408 Mode = 1; 5409 DK = diag::ext_catch_incomplete_ptr; 5410 IncompleteCatchIsInvalid = false; 5411 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5412 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5413 BaseType = Ref->getPointeeType(); 5414 Mode = 2; 5415 DK = diag::ext_catch_incomplete_ref; 5416 IncompleteCatchIsInvalid = false; 5417 } 5418 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5419 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5420 IncompleteCatchIsInvalid) 5421 Invalid = true; 5422 5423 if (!Invalid && !ExDeclType->isDependentType() && 5424 RequireNonAbstractType(Loc, ExDeclType, 5425 diag::err_abstract_type_in_decl, 5426 AbstractVariableType)) 5427 Invalid = true; 5428 5429 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5430 Name, ExDeclType, TInfo, VarDecl::None, 5431 VarDecl::None); 5432 ExDecl->setExceptionVariable(true); 5433 5434 if (!Invalid) { 5435 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5436 // C++ [except.handle]p16: 5437 // The object declared in an exception-declaration or, if the 5438 // exception-declaration does not specify a name, a temporary (12.2) is 5439 // copy-initialized (8.5) from the exception object. [...] 5440 // The object is destroyed when the handler exits, after the destruction 5441 // of any automatic objects initialized within the handler. 5442 // 5443 // We just pretend to initialize the object with itself, then make sure 5444 // it can be destroyed later. 5445 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5446 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5447 Loc, ExDeclType, 0); 5448 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5449 SourceLocation()); 5450 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5451 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5452 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5453 if (Result.isInvalid()) 5454 Invalid = true; 5455 else 5456 FinalizeVarWithDestructor(ExDecl, RecordTy); 5457 } 5458 } 5459 5460 if (Invalid) 5461 ExDecl->setInvalidDecl(); 5462 5463 return ExDecl; 5464} 5465 5466/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5467/// handler. 5468Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5469 TypeSourceInfo *TInfo = 0; 5470 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5471 5472 bool Invalid = D.isInvalidType(); 5473 IdentifierInfo *II = D.getIdentifier(); 5474 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5475 LookupOrdinaryName, 5476 ForRedeclaration)) { 5477 // The scope should be freshly made just for us. There is just no way 5478 // it contains any previous declaration. 5479 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5480 if (PrevDecl->isTemplateParameter()) { 5481 // Maybe we will complain about the shadowed template parameter. 5482 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5483 } 5484 } 5485 5486 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5487 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5488 << D.getCXXScopeSpec().getRange(); 5489 Invalid = true; 5490 } 5491 5492 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5493 D.getIdentifier(), 5494 D.getIdentifierLoc(), 5495 D.getDeclSpec().getSourceRange()); 5496 5497 if (Invalid) 5498 ExDecl->setInvalidDecl(); 5499 5500 // Add the exception declaration into this scope. 5501 if (II) 5502 PushOnScopeChains(ExDecl, S); 5503 else 5504 CurContext->addDecl(ExDecl); 5505 5506 ProcessDeclAttributes(S, ExDecl, D); 5507 return DeclPtrTy::make(ExDecl); 5508} 5509 5510Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5511 ExprArg assertexpr, 5512 ExprArg assertmessageexpr) { 5513 Expr *AssertExpr = (Expr *)assertexpr.get(); 5514 StringLiteral *AssertMessage = 5515 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5516 5517 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5518 llvm::APSInt Value(32); 5519 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5520 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5521 AssertExpr->getSourceRange(); 5522 return DeclPtrTy(); 5523 } 5524 5525 if (Value == 0) { 5526 Diag(AssertLoc, diag::err_static_assert_failed) 5527 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5528 } 5529 } 5530 5531 assertexpr.release(); 5532 assertmessageexpr.release(); 5533 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5534 AssertExpr, AssertMessage); 5535 5536 CurContext->addDecl(Decl); 5537 return DeclPtrTy::make(Decl); 5538} 5539 5540/// \brief Perform semantic analysis of the given friend type declaration. 5541/// 5542/// \returns A friend declaration that. 5543FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5544 TypeSourceInfo *TSInfo) { 5545 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5546 5547 QualType T = TSInfo->getType(); 5548 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5549 5550 if (!getLangOptions().CPlusPlus0x) { 5551 // C++03 [class.friend]p2: 5552 // An elaborated-type-specifier shall be used in a friend declaration 5553 // for a class.* 5554 // 5555 // * The class-key of the elaborated-type-specifier is required. 5556 if (!ActiveTemplateInstantiations.empty()) { 5557 // Do not complain about the form of friend template types during 5558 // template instantiation; we will already have complained when the 5559 // template was declared. 5560 } else if (!T->isElaboratedTypeSpecifier()) { 5561 // If we evaluated the type to a record type, suggest putting 5562 // a tag in front. 5563 if (const RecordType *RT = T->getAs<RecordType>()) { 5564 RecordDecl *RD = RT->getDecl(); 5565 5566 std::string InsertionText = std::string(" ") + RD->getKindName(); 5567 5568 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5569 << (unsigned) RD->getTagKind() 5570 << T 5571 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5572 InsertionText); 5573 } else { 5574 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5575 << T 5576 << SourceRange(FriendLoc, TypeRange.getEnd()); 5577 } 5578 } else if (T->getAs<EnumType>()) { 5579 Diag(FriendLoc, diag::ext_enum_friend) 5580 << T 5581 << SourceRange(FriendLoc, TypeRange.getEnd()); 5582 } 5583 } 5584 5585 // C++0x [class.friend]p3: 5586 // If the type specifier in a friend declaration designates a (possibly 5587 // cv-qualified) class type, that class is declared as a friend; otherwise, 5588 // the friend declaration is ignored. 5589 5590 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5591 // in [class.friend]p3 that we do not implement. 5592 5593 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5594} 5595 5596/// Handle a friend type declaration. This works in tandem with 5597/// ActOnTag. 5598/// 5599/// Notes on friend class templates: 5600/// 5601/// We generally treat friend class declarations as if they were 5602/// declaring a class. So, for example, the elaborated type specifier 5603/// in a friend declaration is required to obey the restrictions of a 5604/// class-head (i.e. no typedefs in the scope chain), template 5605/// parameters are required to match up with simple template-ids, &c. 5606/// However, unlike when declaring a template specialization, it's 5607/// okay to refer to a template specialization without an empty 5608/// template parameter declaration, e.g. 5609/// friend class A<T>::B<unsigned>; 5610/// We permit this as a special case; if there are any template 5611/// parameters present at all, require proper matching, i.e. 5612/// template <> template <class T> friend class A<int>::B; 5613Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5614 MultiTemplateParamsArg TempParams) { 5615 SourceLocation Loc = DS.getSourceRange().getBegin(); 5616 5617 assert(DS.isFriendSpecified()); 5618 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5619 5620 // Try to convert the decl specifier to a type. This works for 5621 // friend templates because ActOnTag never produces a ClassTemplateDecl 5622 // for a TUK_Friend. 5623 Declarator TheDeclarator(DS, Declarator::MemberContext); 5624 TypeSourceInfo *TSI; 5625 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5626 if (TheDeclarator.isInvalidType()) 5627 return DeclPtrTy(); 5628 5629 if (!TSI) 5630 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5631 5632 // This is definitely an error in C++98. It's probably meant to 5633 // be forbidden in C++0x, too, but the specification is just 5634 // poorly written. 5635 // 5636 // The problem is with declarations like the following: 5637 // template <T> friend A<T>::foo; 5638 // where deciding whether a class C is a friend or not now hinges 5639 // on whether there exists an instantiation of A that causes 5640 // 'foo' to equal C. There are restrictions on class-heads 5641 // (which we declare (by fiat) elaborated friend declarations to 5642 // be) that makes this tractable. 5643 // 5644 // FIXME: handle "template <> friend class A<T>;", which 5645 // is possibly well-formed? Who even knows? 5646 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5647 Diag(Loc, diag::err_tagless_friend_type_template) 5648 << DS.getSourceRange(); 5649 return DeclPtrTy(); 5650 } 5651 5652 // C++98 [class.friend]p1: A friend of a class is a function 5653 // or class that is not a member of the class . . . 5654 // This is fixed in DR77, which just barely didn't make the C++03 5655 // deadline. It's also a very silly restriction that seriously 5656 // affects inner classes and which nobody else seems to implement; 5657 // thus we never diagnose it, not even in -pedantic. 5658 // 5659 // But note that we could warn about it: it's always useless to 5660 // friend one of your own members (it's not, however, worthless to 5661 // friend a member of an arbitrary specialization of your template). 5662 5663 Decl *D; 5664 if (unsigned NumTempParamLists = TempParams.size()) 5665 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5666 NumTempParamLists, 5667 (TemplateParameterList**) TempParams.release(), 5668 TSI, 5669 DS.getFriendSpecLoc()); 5670 else 5671 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5672 5673 if (!D) 5674 return DeclPtrTy(); 5675 5676 D->setAccess(AS_public); 5677 CurContext->addDecl(D); 5678 5679 return DeclPtrTy::make(D); 5680} 5681 5682Sema::DeclPtrTy 5683Sema::ActOnFriendFunctionDecl(Scope *S, 5684 Declarator &D, 5685 bool IsDefinition, 5686 MultiTemplateParamsArg TemplateParams) { 5687 const DeclSpec &DS = D.getDeclSpec(); 5688 5689 assert(DS.isFriendSpecified()); 5690 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5691 5692 SourceLocation Loc = D.getIdentifierLoc(); 5693 TypeSourceInfo *TInfo = 0; 5694 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5695 5696 // C++ [class.friend]p1 5697 // A friend of a class is a function or class.... 5698 // Note that this sees through typedefs, which is intended. 5699 // It *doesn't* see through dependent types, which is correct 5700 // according to [temp.arg.type]p3: 5701 // If a declaration acquires a function type through a 5702 // type dependent on a template-parameter and this causes 5703 // a declaration that does not use the syntactic form of a 5704 // function declarator to have a function type, the program 5705 // is ill-formed. 5706 if (!T->isFunctionType()) { 5707 Diag(Loc, diag::err_unexpected_friend); 5708 5709 // It might be worthwhile to try to recover by creating an 5710 // appropriate declaration. 5711 return DeclPtrTy(); 5712 } 5713 5714 // C++ [namespace.memdef]p3 5715 // - If a friend declaration in a non-local class first declares a 5716 // class or function, the friend class or function is a member 5717 // of the innermost enclosing namespace. 5718 // - The name of the friend is not found by simple name lookup 5719 // until a matching declaration is provided in that namespace 5720 // scope (either before or after the class declaration granting 5721 // friendship). 5722 // - If a friend function is called, its name may be found by the 5723 // name lookup that considers functions from namespaces and 5724 // classes associated with the types of the function arguments. 5725 // - When looking for a prior declaration of a class or a function 5726 // declared as a friend, scopes outside the innermost enclosing 5727 // namespace scope are not considered. 5728 5729 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5730 DeclarationName Name = GetNameForDeclarator(D); 5731 assert(Name); 5732 5733 // The context we found the declaration in, or in which we should 5734 // create the declaration. 5735 DeclContext *DC; 5736 5737 // FIXME: handle local classes 5738 5739 // Recover from invalid scope qualifiers as if they just weren't there. 5740 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5741 ForRedeclaration); 5742 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5743 DC = computeDeclContext(ScopeQual); 5744 5745 // FIXME: handle dependent contexts 5746 if (!DC) return DeclPtrTy(); 5747 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5748 5749 LookupQualifiedName(Previous, DC); 5750 5751 // If searching in that context implicitly found a declaration in 5752 // a different context, treat it like it wasn't found at all. 5753 // TODO: better diagnostics for this case. Suggesting the right 5754 // qualified scope would be nice... 5755 // FIXME: getRepresentativeDecl() is not right here at all 5756 if (Previous.empty() || 5757 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5758 D.setInvalidType(); 5759 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5760 return DeclPtrTy(); 5761 } 5762 5763 // C++ [class.friend]p1: A friend of a class is a function or 5764 // class that is not a member of the class . . . 5765 if (DC->Equals(CurContext)) 5766 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5767 5768 // Otherwise walk out to the nearest namespace scope looking for matches. 5769 } else { 5770 // TODO: handle local class contexts. 5771 5772 DC = CurContext; 5773 while (true) { 5774 // Skip class contexts. If someone can cite chapter and verse 5775 // for this behavior, that would be nice --- it's what GCC and 5776 // EDG do, and it seems like a reasonable intent, but the spec 5777 // really only says that checks for unqualified existing 5778 // declarations should stop at the nearest enclosing namespace, 5779 // not that they should only consider the nearest enclosing 5780 // namespace. 5781 while (DC->isRecord()) 5782 DC = DC->getParent(); 5783 5784 LookupQualifiedName(Previous, DC); 5785 5786 // TODO: decide what we think about using declarations. 5787 if (!Previous.empty()) 5788 break; 5789 5790 if (DC->isFileContext()) break; 5791 DC = DC->getParent(); 5792 } 5793 5794 // C++ [class.friend]p1: A friend of a class is a function or 5795 // class that is not a member of the class . . . 5796 // C++0x changes this for both friend types and functions. 5797 // Most C++ 98 compilers do seem to give an error here, so 5798 // we do, too. 5799 if (!Previous.empty() && DC->Equals(CurContext) 5800 && !getLangOptions().CPlusPlus0x) 5801 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5802 } 5803 5804 if (DC->isFileContext()) { 5805 // This implies that it has to be an operator or function. 5806 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5807 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5808 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5809 Diag(Loc, diag::err_introducing_special_friend) << 5810 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5811 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5812 return DeclPtrTy(); 5813 } 5814 } 5815 5816 bool Redeclaration = false; 5817 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5818 move(TemplateParams), 5819 IsDefinition, 5820 Redeclaration); 5821 if (!ND) return DeclPtrTy(); 5822 5823 assert(ND->getDeclContext() == DC); 5824 assert(ND->getLexicalDeclContext() == CurContext); 5825 5826 // Add the function declaration to the appropriate lookup tables, 5827 // adjusting the redeclarations list as necessary. We don't 5828 // want to do this yet if the friending class is dependent. 5829 // 5830 // Also update the scope-based lookup if the target context's 5831 // lookup context is in lexical scope. 5832 if (!CurContext->isDependentContext()) { 5833 DC = DC->getLookupContext(); 5834 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5835 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5836 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5837 } 5838 5839 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5840 D.getIdentifierLoc(), ND, 5841 DS.getFriendSpecLoc()); 5842 FrD->setAccess(AS_public); 5843 CurContext->addDecl(FrD); 5844 5845 return DeclPtrTy::make(ND); 5846} 5847 5848void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5849 AdjustDeclIfTemplate(dcl); 5850 5851 Decl *Dcl = dcl.getAs<Decl>(); 5852 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5853 if (!Fn) { 5854 Diag(DelLoc, diag::err_deleted_non_function); 5855 return; 5856 } 5857 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5858 Diag(DelLoc, diag::err_deleted_decl_not_first); 5859 Diag(Prev->getLocation(), diag::note_previous_declaration); 5860 // If the declaration wasn't the first, we delete the function anyway for 5861 // recovery. 5862 } 5863 Fn->setDeleted(); 5864} 5865 5866static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5867 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5868 ++CI) { 5869 Stmt *SubStmt = *CI; 5870 if (!SubStmt) 5871 continue; 5872 if (isa<ReturnStmt>(SubStmt)) 5873 Self.Diag(SubStmt->getSourceRange().getBegin(), 5874 diag::err_return_in_constructor_handler); 5875 if (!isa<Expr>(SubStmt)) 5876 SearchForReturnInStmt(Self, SubStmt); 5877 } 5878} 5879 5880void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5881 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5882 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5883 SearchForReturnInStmt(*this, Handler); 5884 } 5885} 5886 5887bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5888 const CXXMethodDecl *Old) { 5889 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5890 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5891 5892 if (Context.hasSameType(NewTy, OldTy) || 5893 NewTy->isDependentType() || OldTy->isDependentType()) 5894 return false; 5895 5896 // Check if the return types are covariant 5897 QualType NewClassTy, OldClassTy; 5898 5899 /// Both types must be pointers or references to classes. 5900 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5901 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5902 NewClassTy = NewPT->getPointeeType(); 5903 OldClassTy = OldPT->getPointeeType(); 5904 } 5905 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5906 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5907 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5908 NewClassTy = NewRT->getPointeeType(); 5909 OldClassTy = OldRT->getPointeeType(); 5910 } 5911 } 5912 } 5913 5914 // The return types aren't either both pointers or references to a class type. 5915 if (NewClassTy.isNull()) { 5916 Diag(New->getLocation(), 5917 diag::err_different_return_type_for_overriding_virtual_function) 5918 << New->getDeclName() << NewTy << OldTy; 5919 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5920 5921 return true; 5922 } 5923 5924 // C++ [class.virtual]p6: 5925 // If the return type of D::f differs from the return type of B::f, the 5926 // class type in the return type of D::f shall be complete at the point of 5927 // declaration of D::f or shall be the class type D. 5928 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5929 if (!RT->isBeingDefined() && 5930 RequireCompleteType(New->getLocation(), NewClassTy, 5931 PDiag(diag::err_covariant_return_incomplete) 5932 << New->getDeclName())) 5933 return true; 5934 } 5935 5936 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5937 // Check if the new class derives from the old class. 5938 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5939 Diag(New->getLocation(), 5940 diag::err_covariant_return_not_derived) 5941 << New->getDeclName() << NewTy << OldTy; 5942 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5943 return true; 5944 } 5945 5946 // Check if we the conversion from derived to base is valid. 5947 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5948 diag::err_covariant_return_inaccessible_base, 5949 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5950 // FIXME: Should this point to the return type? 5951 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5952 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5953 return true; 5954 } 5955 } 5956 5957 // The qualifiers of the return types must be the same. 5958 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5959 Diag(New->getLocation(), 5960 diag::err_covariant_return_type_different_qualifications) 5961 << New->getDeclName() << NewTy << OldTy; 5962 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5963 return true; 5964 }; 5965 5966 5967 // The new class type must have the same or less qualifiers as the old type. 5968 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5969 Diag(New->getLocation(), 5970 diag::err_covariant_return_type_class_type_more_qualified) 5971 << New->getDeclName() << NewTy << OldTy; 5972 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5973 return true; 5974 }; 5975 5976 return false; 5977} 5978 5979bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5980 const CXXMethodDecl *Old) 5981{ 5982 if (Old->hasAttr<FinalAttr>()) { 5983 Diag(New->getLocation(), diag::err_final_function_overridden) 5984 << New->getDeclName(); 5985 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5986 return true; 5987 } 5988 5989 return false; 5990} 5991 5992/// \brief Mark the given method pure. 5993/// 5994/// \param Method the method to be marked pure. 5995/// 5996/// \param InitRange the source range that covers the "0" initializer. 5997bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5998 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5999 Method->setPure(); 6000 6001 // A class is abstract if at least one function is pure virtual. 6002 Method->getParent()->setAbstract(true); 6003 return false; 6004 } 6005 6006 if (!Method->isInvalidDecl()) 6007 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6008 << Method->getDeclName() << InitRange; 6009 return true; 6010} 6011 6012/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6013/// an initializer for the out-of-line declaration 'Dcl'. The scope 6014/// is a fresh scope pushed for just this purpose. 6015/// 6016/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6017/// static data member of class X, names should be looked up in the scope of 6018/// class X. 6019void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6020 // If there is no declaration, there was an error parsing it. 6021 Decl *D = Dcl.getAs<Decl>(); 6022 if (D == 0) return; 6023 6024 // We should only get called for declarations with scope specifiers, like: 6025 // int foo::bar; 6026 assert(D->isOutOfLine()); 6027 EnterDeclaratorContext(S, D->getDeclContext()); 6028} 6029 6030/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6031/// initializer for the out-of-line declaration 'Dcl'. 6032void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6033 // If there is no declaration, there was an error parsing it. 6034 Decl *D = Dcl.getAs<Decl>(); 6035 if (D == 0) return; 6036 6037 assert(D->isOutOfLine()); 6038 ExitDeclaratorContext(S); 6039} 6040 6041/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6042/// C++ if/switch/while/for statement. 6043/// e.g: "if (int x = f()) {...}" 6044Action::DeclResult 6045Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6046 // C++ 6.4p2: 6047 // The declarator shall not specify a function or an array. 6048 // The type-specifier-seq shall not contain typedef and shall not declare a 6049 // new class or enumeration. 6050 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6051 "Parser allowed 'typedef' as storage class of condition decl."); 6052 6053 TypeSourceInfo *TInfo = 0; 6054 TagDecl *OwnedTag = 0; 6055 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 6056 6057 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6058 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6059 // would be created and CXXConditionDeclExpr wants a VarDecl. 6060 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6061 << D.getSourceRange(); 6062 return DeclResult(); 6063 } else if (OwnedTag && OwnedTag->isDefinition()) { 6064 // The type-specifier-seq shall not declare a new class or enumeration. 6065 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6066 } 6067 6068 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6069 if (!Dcl) 6070 return DeclResult(); 6071 6072 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6073 VD->setDeclaredInCondition(true); 6074 return Dcl; 6075} 6076 6077void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6078 bool DefinitionRequired) { 6079 // Ignore any vtable uses in unevaluated operands or for classes that do 6080 // not have a vtable. 6081 if (!Class->isDynamicClass() || Class->isDependentContext() || 6082 CurContext->isDependentContext() || 6083 ExprEvalContexts.back().Context == Unevaluated) 6084 return; 6085 6086 // Try to insert this class into the map. 6087 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6088 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6089 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6090 if (!Pos.second) { 6091 // If we already had an entry, check to see if we are promoting this vtable 6092 // to required a definition. If so, we need to reappend to the VTableUses 6093 // list, since we may have already processed the first entry. 6094 if (DefinitionRequired && !Pos.first->second) { 6095 Pos.first->second = true; 6096 } else { 6097 // Otherwise, we can early exit. 6098 return; 6099 } 6100 } 6101 6102 // Local classes need to have their virtual members marked 6103 // immediately. For all other classes, we mark their virtual members 6104 // at the end of the translation unit. 6105 if (Class->isLocalClass()) 6106 MarkVirtualMembersReferenced(Loc, Class); 6107 else 6108 VTableUses.push_back(std::make_pair(Class, Loc)); 6109} 6110 6111bool Sema::DefineUsedVTables() { 6112 // If any dynamic classes have their key function defined within 6113 // this translation unit, then those vtables are considered "used" and must 6114 // be emitted. 6115 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6116 if (const CXXMethodDecl *KeyFunction 6117 = Context.getKeyFunction(DynamicClasses[I])) { 6118 const FunctionDecl *Definition = 0; 6119 if (KeyFunction->getBody(Definition)) 6120 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6121 } 6122 } 6123 6124 if (VTableUses.empty()) 6125 return false; 6126 6127 // Note: The VTableUses vector could grow as a result of marking 6128 // the members of a class as "used", so we check the size each 6129 // time through the loop and prefer indices (with are stable) to 6130 // iterators (which are not). 6131 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6132 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6133 if (!Class) 6134 continue; 6135 6136 SourceLocation Loc = VTableUses[I].second; 6137 6138 // If this class has a key function, but that key function is 6139 // defined in another translation unit, we don't need to emit the 6140 // vtable even though we're using it. 6141 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6142 if (KeyFunction && !KeyFunction->getBody()) { 6143 switch (KeyFunction->getTemplateSpecializationKind()) { 6144 case TSK_Undeclared: 6145 case TSK_ExplicitSpecialization: 6146 case TSK_ExplicitInstantiationDeclaration: 6147 // The key function is in another translation unit. 6148 continue; 6149 6150 case TSK_ExplicitInstantiationDefinition: 6151 case TSK_ImplicitInstantiation: 6152 // We will be instantiating the key function. 6153 break; 6154 } 6155 } else if (!KeyFunction) { 6156 // If we have a class with no key function that is the subject 6157 // of an explicit instantiation declaration, suppress the 6158 // vtable; it will live with the explicit instantiation 6159 // definition. 6160 bool IsExplicitInstantiationDeclaration 6161 = Class->getTemplateSpecializationKind() 6162 == TSK_ExplicitInstantiationDeclaration; 6163 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6164 REnd = Class->redecls_end(); 6165 R != REnd; ++R) { 6166 TemplateSpecializationKind TSK 6167 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6168 if (TSK == TSK_ExplicitInstantiationDeclaration) 6169 IsExplicitInstantiationDeclaration = true; 6170 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6171 IsExplicitInstantiationDeclaration = false; 6172 break; 6173 } 6174 } 6175 6176 if (IsExplicitInstantiationDeclaration) 6177 continue; 6178 } 6179 6180 // Mark all of the virtual members of this class as referenced, so 6181 // that we can build a vtable. Then, tell the AST consumer that a 6182 // vtable for this class is required. 6183 MarkVirtualMembersReferenced(Loc, Class); 6184 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6185 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6186 6187 // Optionally warn if we're emitting a weak vtable. 6188 if (Class->getLinkage() == ExternalLinkage && 6189 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6190 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6191 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6192 } 6193 } 6194 VTableUses.clear(); 6195 6196 return true; 6197} 6198 6199void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6200 const CXXRecordDecl *RD) { 6201 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6202 e = RD->method_end(); i != e; ++i) { 6203 CXXMethodDecl *MD = *i; 6204 6205 // C++ [basic.def.odr]p2: 6206 // [...] A virtual member function is used if it is not pure. [...] 6207 if (MD->isVirtual() && !MD->isPure()) 6208 MarkDeclarationReferenced(Loc, MD); 6209 } 6210 6211 // Only classes that have virtual bases need a VTT. 6212 if (RD->getNumVBases() == 0) 6213 return; 6214 6215 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6216 e = RD->bases_end(); i != e; ++i) { 6217 const CXXRecordDecl *Base = 6218 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6219 if (i->isVirtual()) 6220 continue; 6221 if (Base->getNumVBases() == 0) 6222 continue; 6223 MarkVirtualMembersReferenced(Loc, Base); 6224 } 6225} 6226 6227/// SetIvarInitializers - This routine builds initialization ASTs for the 6228/// Objective-C implementation whose ivars need be initialized. 6229void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6230 if (!getLangOptions().CPlusPlus) 6231 return; 6232 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6233 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6234 CollectIvarsToConstructOrDestruct(OID, ivars); 6235 if (ivars.empty()) 6236 return; 6237 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6238 for (unsigned i = 0; i < ivars.size(); i++) { 6239 FieldDecl *Field = ivars[i]; 6240 if (Field->isInvalidDecl()) 6241 continue; 6242 6243 CXXBaseOrMemberInitializer *Member; 6244 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6245 InitializationKind InitKind = 6246 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6247 6248 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6249 Sema::OwningExprResult MemberInit = 6250 InitSeq.Perform(*this, InitEntity, InitKind, 6251 Sema::MultiExprArg(*this, 0, 0)); 6252 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6253 // Note, MemberInit could actually come back empty if no initialization 6254 // is required (e.g., because it would call a trivial default constructor) 6255 if (!MemberInit.get() || MemberInit.isInvalid()) 6256 continue; 6257 6258 Member = 6259 new (Context) CXXBaseOrMemberInitializer(Context, 6260 Field, SourceLocation(), 6261 SourceLocation(), 6262 MemberInit.takeAs<Expr>(), 6263 SourceLocation()); 6264 AllToInit.push_back(Member); 6265 6266 // Be sure that the destructor is accessible and is marked as referenced. 6267 if (const RecordType *RecordTy 6268 = Context.getBaseElementType(Field->getType()) 6269 ->getAs<RecordType>()) { 6270 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6271 if (CXXDestructorDecl *Destructor 6272 = const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) { 6273 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6274 CheckDestructorAccess(Field->getLocation(), Destructor, 6275 PDiag(diag::err_access_dtor_ivar) 6276 << Context.getBaseElementType(Field->getType())); 6277 } 6278 } 6279 } 6280 ObjCImplementation->setIvarInitializers(Context, 6281 AllToInit.data(), AllToInit.size()); 6282 } 6283} 6284