SemaDeclCXX.cpp revision 9614dc0f76af9707a07d656056d2ec08cdd04b3a
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 626 if (KnownBaseTypes[NewBaseType]) { 627 // C++ [class.mi]p3: 628 // A class shall not be specified as a direct base class of a 629 // derived class more than once. 630 Diag(Bases[idx]->getSourceRange().getBegin(), 631 diag::err_duplicate_base_class) 632 << KnownBaseTypes[NewBaseType]->getType() 633 << Bases[idx]->getSourceRange(); 634 635 // Delete the duplicate base class specifier; we're going to 636 // overwrite its pointer later. 637 Context.Deallocate(Bases[idx]); 638 639 Invalid = true; 640 } else { 641 // Okay, add this new base class. 642 KnownBaseTypes[NewBaseType] = Bases[idx]; 643 Bases[NumGoodBases++] = Bases[idx]; 644 } 645 } 646 647 // Attach the remaining base class specifiers to the derived class. 648 Class->setBases(Bases, NumGoodBases); 649 650 // Delete the remaining (good) base class specifiers, since their 651 // data has been copied into the CXXRecordDecl. 652 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 653 Context.Deallocate(Bases[idx]); 654 655 return Invalid; 656} 657 658/// ActOnBaseSpecifiers - Attach the given base specifiers to the 659/// class, after checking whether there are any duplicate base 660/// classes. 661void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 662 unsigned NumBases) { 663 if (!ClassDecl || !Bases || !NumBases) 664 return; 665 666 AdjustDeclIfTemplate(ClassDecl); 667 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 668 (CXXBaseSpecifier**)(Bases), NumBases); 669} 670 671static CXXRecordDecl *GetClassForType(QualType T) { 672 if (const RecordType *RT = T->getAs<RecordType>()) 673 return cast<CXXRecordDecl>(RT->getDecl()); 674 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 675 return ICT->getDecl(); 676 else 677 return 0; 678} 679 680/// \brief Determine whether the type \p Derived is a C++ class that is 681/// derived from the type \p Base. 682bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 683 if (!getLangOptions().CPlusPlus) 684 return false; 685 686 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 687 if (!DerivedRD) 688 return false; 689 690 CXXRecordDecl *BaseRD = GetClassForType(Base); 691 if (!BaseRD) 692 return false; 693 694 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 695 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 696} 697 698/// \brief Determine whether the type \p Derived is a C++ class that is 699/// derived from the type \p Base. 700bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 701 if (!getLangOptions().CPlusPlus) 702 return false; 703 704 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 705 if (!DerivedRD) 706 return false; 707 708 CXXRecordDecl *BaseRD = GetClassForType(Base); 709 if (!BaseRD) 710 return false; 711 712 return DerivedRD->isDerivedFrom(BaseRD, Paths); 713} 714 715void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 716 CXXBaseSpecifierArray &BasePathArray) { 717 assert(BasePathArray.empty() && "Base path array must be empty!"); 718 assert(Paths.isRecordingPaths() && "Must record paths!"); 719 720 const CXXBasePath &Path = Paths.front(); 721 722 // We first go backward and check if we have a virtual base. 723 // FIXME: It would be better if CXXBasePath had the base specifier for 724 // the nearest virtual base. 725 unsigned Start = 0; 726 for (unsigned I = Path.size(); I != 0; --I) { 727 if (Path[I - 1].Base->isVirtual()) { 728 Start = I - 1; 729 break; 730 } 731 } 732 733 // Now add all bases. 734 for (unsigned I = Start, E = Path.size(); I != E; ++I) 735 BasePathArray.push_back(Path[I].Base); 736} 737 738/// \brief Determine whether the given base path includes a virtual 739/// base class. 740bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 741 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 742 BEnd = BasePath.end(); 743 B != BEnd; ++B) 744 if ((*B)->isVirtual()) 745 return true; 746 747 return false; 748} 749 750/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 751/// conversion (where Derived and Base are class types) is 752/// well-formed, meaning that the conversion is unambiguous (and 753/// that all of the base classes are accessible). Returns true 754/// and emits a diagnostic if the code is ill-formed, returns false 755/// otherwise. Loc is the location where this routine should point to 756/// if there is an error, and Range is the source range to highlight 757/// if there is an error. 758bool 759Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 760 unsigned InaccessibleBaseID, 761 unsigned AmbigiousBaseConvID, 762 SourceLocation Loc, SourceRange Range, 763 DeclarationName Name, 764 CXXBaseSpecifierArray *BasePath) { 765 // First, determine whether the path from Derived to Base is 766 // ambiguous. This is slightly more expensive than checking whether 767 // the Derived to Base conversion exists, because here we need to 768 // explore multiple paths to determine if there is an ambiguity. 769 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 770 /*DetectVirtual=*/false); 771 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 772 assert(DerivationOkay && 773 "Can only be used with a derived-to-base conversion"); 774 (void)DerivationOkay; 775 776 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 777 if (InaccessibleBaseID) { 778 // Check that the base class can be accessed. 779 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 780 InaccessibleBaseID)) { 781 case AR_inaccessible: 782 return true; 783 case AR_accessible: 784 case AR_dependent: 785 case AR_delayed: 786 break; 787 } 788 } 789 790 // Build a base path if necessary. 791 if (BasePath) 792 BuildBasePathArray(Paths, *BasePath); 793 return false; 794 } 795 796 // We know that the derived-to-base conversion is ambiguous, and 797 // we're going to produce a diagnostic. Perform the derived-to-base 798 // search just one more time to compute all of the possible paths so 799 // that we can print them out. This is more expensive than any of 800 // the previous derived-to-base checks we've done, but at this point 801 // performance isn't as much of an issue. 802 Paths.clear(); 803 Paths.setRecordingPaths(true); 804 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 805 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 806 (void)StillOkay; 807 808 // Build up a textual representation of the ambiguous paths, e.g., 809 // D -> B -> A, that will be used to illustrate the ambiguous 810 // conversions in the diagnostic. We only print one of the paths 811 // to each base class subobject. 812 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 813 814 Diag(Loc, AmbigiousBaseConvID) 815 << Derived << Base << PathDisplayStr << Range << Name; 816 return true; 817} 818 819bool 820Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 821 SourceLocation Loc, SourceRange Range, 822 CXXBaseSpecifierArray *BasePath, 823 bool IgnoreAccess) { 824 return CheckDerivedToBaseConversion(Derived, Base, 825 IgnoreAccess ? 0 826 : diag::err_upcast_to_inaccessible_base, 827 diag::err_ambiguous_derived_to_base_conv, 828 Loc, Range, DeclarationName(), 829 BasePath); 830} 831 832 833/// @brief Builds a string representing ambiguous paths from a 834/// specific derived class to different subobjects of the same base 835/// class. 836/// 837/// This function builds a string that can be used in error messages 838/// to show the different paths that one can take through the 839/// inheritance hierarchy to go from the derived class to different 840/// subobjects of a base class. The result looks something like this: 841/// @code 842/// struct D -> struct B -> struct A 843/// struct D -> struct C -> struct A 844/// @endcode 845std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 846 std::string PathDisplayStr; 847 std::set<unsigned> DisplayedPaths; 848 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 849 Path != Paths.end(); ++Path) { 850 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 851 // We haven't displayed a path to this particular base 852 // class subobject yet. 853 PathDisplayStr += "\n "; 854 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 855 for (CXXBasePath::const_iterator Element = Path->begin(); 856 Element != Path->end(); ++Element) 857 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 858 } 859 } 860 861 return PathDisplayStr; 862} 863 864//===----------------------------------------------------------------------===// 865// C++ class member Handling 866//===----------------------------------------------------------------------===// 867 868/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 869/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 870/// bitfield width if there is one and 'InitExpr' specifies the initializer if 871/// any. 872Sema::DeclPtrTy 873Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 874 MultiTemplateParamsArg TemplateParameterLists, 875 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 876 bool Deleted) { 877 const DeclSpec &DS = D.getDeclSpec(); 878 DeclarationName Name = GetNameForDeclarator(D); 879 Expr *BitWidth = static_cast<Expr*>(BW); 880 Expr *Init = static_cast<Expr*>(InitExpr); 881 SourceLocation Loc = D.getIdentifierLoc(); 882 883 bool isFunc = D.isFunctionDeclarator(); 884 885 assert(!DS.isFriendSpecified()); 886 887 // C++ 9.2p6: A member shall not be declared to have automatic storage 888 // duration (auto, register) or with the extern storage-class-specifier. 889 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 890 // data members and cannot be applied to names declared const or static, 891 // and cannot be applied to reference members. 892 switch (DS.getStorageClassSpec()) { 893 case DeclSpec::SCS_unspecified: 894 case DeclSpec::SCS_typedef: 895 case DeclSpec::SCS_static: 896 // FALL THROUGH. 897 break; 898 case DeclSpec::SCS_mutable: 899 if (isFunc) { 900 if (DS.getStorageClassSpecLoc().isValid()) 901 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 902 else 903 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 904 905 // FIXME: It would be nicer if the keyword was ignored only for this 906 // declarator. Otherwise we could get follow-up errors. 907 D.getMutableDeclSpec().ClearStorageClassSpecs(); 908 } else { 909 QualType T = GetTypeForDeclarator(D, S); 910 diag::kind err = static_cast<diag::kind>(0); 911 if (T->isReferenceType()) 912 err = diag::err_mutable_reference; 913 else if (T.isConstQualified()) 914 err = diag::err_mutable_const; 915 if (err != 0) { 916 if (DS.getStorageClassSpecLoc().isValid()) 917 Diag(DS.getStorageClassSpecLoc(), err); 918 else 919 Diag(DS.getThreadSpecLoc(), err); 920 // FIXME: It would be nicer if the keyword was ignored only for this 921 // declarator. Otherwise we could get follow-up errors. 922 D.getMutableDeclSpec().ClearStorageClassSpecs(); 923 } 924 } 925 break; 926 default: 927 if (DS.getStorageClassSpecLoc().isValid()) 928 Diag(DS.getStorageClassSpecLoc(), 929 diag::err_storageclass_invalid_for_member); 930 else 931 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 932 D.getMutableDeclSpec().ClearStorageClassSpecs(); 933 } 934 935 if (!isFunc && 936 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 937 D.getNumTypeObjects() == 0) { 938 // Check also for this case: 939 // 940 // typedef int f(); 941 // f a; 942 // 943 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 944 isFunc = TDType->isFunctionType(); 945 } 946 947 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 948 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 949 !isFunc); 950 951 Decl *Member; 952 if (isInstField) { 953 // FIXME: Check for template parameters! 954 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 955 AS); 956 assert(Member && "HandleField never returns null"); 957 } else { 958 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 959 .getAs<Decl>(); 960 if (!Member) { 961 if (BitWidth) DeleteExpr(BitWidth); 962 return DeclPtrTy(); 963 } 964 965 // Non-instance-fields can't have a bitfield. 966 if (BitWidth) { 967 if (Member->isInvalidDecl()) { 968 // don't emit another diagnostic. 969 } else if (isa<VarDecl>(Member)) { 970 // C++ 9.6p3: A bit-field shall not be a static member. 971 // "static member 'A' cannot be a bit-field" 972 Diag(Loc, diag::err_static_not_bitfield) 973 << Name << BitWidth->getSourceRange(); 974 } else if (isa<TypedefDecl>(Member)) { 975 // "typedef member 'x' cannot be a bit-field" 976 Diag(Loc, diag::err_typedef_not_bitfield) 977 << Name << BitWidth->getSourceRange(); 978 } else { 979 // A function typedef ("typedef int f(); f a;"). 980 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 981 Diag(Loc, diag::err_not_integral_type_bitfield) 982 << Name << cast<ValueDecl>(Member)->getType() 983 << BitWidth->getSourceRange(); 984 } 985 986 DeleteExpr(BitWidth); 987 BitWidth = 0; 988 Member->setInvalidDecl(); 989 } 990 991 Member->setAccess(AS); 992 993 // If we have declared a member function template, set the access of the 994 // templated declaration as well. 995 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 996 FunTmpl->getTemplatedDecl()->setAccess(AS); 997 } 998 999 assert((Name || isInstField) && "No identifier for non-field ?"); 1000 1001 if (Init) 1002 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1003 if (Deleted) // FIXME: Source location is not very good. 1004 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1005 1006 if (isInstField) { 1007 FieldCollector->Add(cast<FieldDecl>(Member)); 1008 return DeclPtrTy(); 1009 } 1010 return DeclPtrTy::make(Member); 1011} 1012 1013/// \brief Find the direct and/or virtual base specifiers that 1014/// correspond to the given base type, for use in base initialization 1015/// within a constructor. 1016static bool FindBaseInitializer(Sema &SemaRef, 1017 CXXRecordDecl *ClassDecl, 1018 QualType BaseType, 1019 const CXXBaseSpecifier *&DirectBaseSpec, 1020 const CXXBaseSpecifier *&VirtualBaseSpec) { 1021 // First, check for a direct base class. 1022 DirectBaseSpec = 0; 1023 for (CXXRecordDecl::base_class_const_iterator Base 1024 = ClassDecl->bases_begin(); 1025 Base != ClassDecl->bases_end(); ++Base) { 1026 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1027 // We found a direct base of this type. That's what we're 1028 // initializing. 1029 DirectBaseSpec = &*Base; 1030 break; 1031 } 1032 } 1033 1034 // Check for a virtual base class. 1035 // FIXME: We might be able to short-circuit this if we know in advance that 1036 // there are no virtual bases. 1037 VirtualBaseSpec = 0; 1038 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1039 // We haven't found a base yet; search the class hierarchy for a 1040 // virtual base class. 1041 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1042 /*DetectVirtual=*/false); 1043 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1044 BaseType, Paths)) { 1045 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1046 Path != Paths.end(); ++Path) { 1047 if (Path->back().Base->isVirtual()) { 1048 VirtualBaseSpec = Path->back().Base; 1049 break; 1050 } 1051 } 1052 } 1053 } 1054 1055 return DirectBaseSpec || VirtualBaseSpec; 1056} 1057 1058/// ActOnMemInitializer - Handle a C++ member initializer. 1059Sema::MemInitResult 1060Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1061 Scope *S, 1062 CXXScopeSpec &SS, 1063 IdentifierInfo *MemberOrBase, 1064 TypeTy *TemplateTypeTy, 1065 SourceLocation IdLoc, 1066 SourceLocation LParenLoc, 1067 ExprTy **Args, unsigned NumArgs, 1068 SourceLocation *CommaLocs, 1069 SourceLocation RParenLoc) { 1070 if (!ConstructorD) 1071 return true; 1072 1073 AdjustDeclIfTemplate(ConstructorD); 1074 1075 CXXConstructorDecl *Constructor 1076 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1077 if (!Constructor) { 1078 // The user wrote a constructor initializer on a function that is 1079 // not a C++ constructor. Ignore the error for now, because we may 1080 // have more member initializers coming; we'll diagnose it just 1081 // once in ActOnMemInitializers. 1082 return true; 1083 } 1084 1085 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1086 1087 // C++ [class.base.init]p2: 1088 // Names in a mem-initializer-id are looked up in the scope of the 1089 // constructor’s class and, if not found in that scope, are looked 1090 // up in the scope containing the constructor’s 1091 // definition. [Note: if the constructor’s class contains a member 1092 // with the same name as a direct or virtual base class of the 1093 // class, a mem-initializer-id naming the member or base class and 1094 // composed of a single identifier refers to the class member. A 1095 // mem-initializer-id for the hidden base class may be specified 1096 // using a qualified name. ] 1097 if (!SS.getScopeRep() && !TemplateTypeTy) { 1098 // Look for a member, first. 1099 FieldDecl *Member = 0; 1100 DeclContext::lookup_result Result 1101 = ClassDecl->lookup(MemberOrBase); 1102 if (Result.first != Result.second) 1103 Member = dyn_cast<FieldDecl>(*Result.first); 1104 1105 // FIXME: Handle members of an anonymous union. 1106 1107 if (Member) 1108 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1109 LParenLoc, RParenLoc); 1110 } 1111 // It didn't name a member, so see if it names a class. 1112 QualType BaseType; 1113 TypeSourceInfo *TInfo = 0; 1114 1115 if (TemplateTypeTy) { 1116 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1117 } else { 1118 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1119 LookupParsedName(R, S, &SS); 1120 1121 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1122 if (!TyD) { 1123 if (R.isAmbiguous()) return true; 1124 1125 // We don't want access-control diagnostics here. 1126 R.suppressDiagnostics(); 1127 1128 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1129 bool NotUnknownSpecialization = false; 1130 DeclContext *DC = computeDeclContext(SS, false); 1131 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1132 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1133 1134 if (!NotUnknownSpecialization) { 1135 // When the scope specifier can refer to a member of an unknown 1136 // specialization, we take it as a type name. 1137 BaseType = CheckTypenameType(ETK_None, 1138 (NestedNameSpecifier *)SS.getScopeRep(), 1139 *MemberOrBase, SS.getRange()); 1140 if (BaseType.isNull()) 1141 return true; 1142 1143 R.clear(); 1144 } 1145 } 1146 1147 // If no results were found, try to correct typos. 1148 if (R.empty() && BaseType.isNull() && 1149 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1150 R.isSingleResult()) { 1151 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1152 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1153 // We have found a non-static data member with a similar 1154 // name to what was typed; complain and initialize that 1155 // member. 1156 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1157 << MemberOrBase << true << R.getLookupName() 1158 << FixItHint::CreateReplacement(R.getNameLoc(), 1159 R.getLookupName().getAsString()); 1160 Diag(Member->getLocation(), diag::note_previous_decl) 1161 << Member->getDeclName(); 1162 1163 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1164 LParenLoc, RParenLoc); 1165 } 1166 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1167 const CXXBaseSpecifier *DirectBaseSpec; 1168 const CXXBaseSpecifier *VirtualBaseSpec; 1169 if (FindBaseInitializer(*this, ClassDecl, 1170 Context.getTypeDeclType(Type), 1171 DirectBaseSpec, VirtualBaseSpec)) { 1172 // We have found a direct or virtual base class with a 1173 // similar name to what was typed; complain and initialize 1174 // that base class. 1175 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1176 << MemberOrBase << false << R.getLookupName() 1177 << FixItHint::CreateReplacement(R.getNameLoc(), 1178 R.getLookupName().getAsString()); 1179 1180 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1181 : VirtualBaseSpec; 1182 Diag(BaseSpec->getSourceRange().getBegin(), 1183 diag::note_base_class_specified_here) 1184 << BaseSpec->getType() 1185 << BaseSpec->getSourceRange(); 1186 1187 TyD = Type; 1188 } 1189 } 1190 } 1191 1192 if (!TyD && BaseType.isNull()) { 1193 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1194 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1195 return true; 1196 } 1197 } 1198 1199 if (BaseType.isNull()) { 1200 BaseType = Context.getTypeDeclType(TyD); 1201 if (SS.isSet()) { 1202 NestedNameSpecifier *Qualifier = 1203 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1204 1205 // FIXME: preserve source range information 1206 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1207 } 1208 } 1209 } 1210 1211 if (!TInfo) 1212 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1213 1214 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1215 LParenLoc, RParenLoc, ClassDecl); 1216} 1217 1218/// Checks an initializer expression for use of uninitialized fields, such as 1219/// containing the field that is being initialized. Returns true if there is an 1220/// uninitialized field was used an updates the SourceLocation parameter; false 1221/// otherwise. 1222static bool InitExprContainsUninitializedFields(const Stmt* S, 1223 const FieldDecl* LhsField, 1224 SourceLocation* L) { 1225 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1226 if (ME) { 1227 const NamedDecl* RhsField = ME->getMemberDecl(); 1228 if (RhsField == LhsField) { 1229 // Initializing a field with itself. Throw a warning. 1230 // But wait; there are exceptions! 1231 // Exception #1: The field may not belong to this record. 1232 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1233 const Expr* base = ME->getBase(); 1234 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1235 // Even though the field matches, it does not belong to this record. 1236 return false; 1237 } 1238 // None of the exceptions triggered; return true to indicate an 1239 // uninitialized field was used. 1240 *L = ME->getMemberLoc(); 1241 return true; 1242 } 1243 } 1244 bool found = false; 1245 for (Stmt::const_child_iterator it = S->child_begin(); 1246 it != S->child_end() && found == false; 1247 ++it) { 1248 if (isa<CallExpr>(S)) { 1249 // Do not descend into function calls or constructors, as the use 1250 // of an uninitialized field may be valid. One would have to inspect 1251 // the contents of the function/ctor to determine if it is safe or not. 1252 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1253 // may be safe, depending on what the function/ctor does. 1254 continue; 1255 } 1256 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1257 } 1258 return found; 1259} 1260 1261Sema::MemInitResult 1262Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1263 unsigned NumArgs, SourceLocation IdLoc, 1264 SourceLocation LParenLoc, 1265 SourceLocation RParenLoc) { 1266 // Diagnose value-uses of fields to initialize themselves, e.g. 1267 // foo(foo) 1268 // where foo is not also a parameter to the constructor. 1269 // TODO: implement -Wuninitialized and fold this into that framework. 1270 for (unsigned i = 0; i < NumArgs; ++i) { 1271 SourceLocation L; 1272 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1273 // FIXME: Return true in the case when other fields are used before being 1274 // uninitialized. For example, let this field be the i'th field. When 1275 // initializing the i'th field, throw a warning if any of the >= i'th 1276 // fields are used, as they are not yet initialized. 1277 // Right now we are only handling the case where the i'th field uses 1278 // itself in its initializer. 1279 Diag(L, diag::warn_field_is_uninit); 1280 } 1281 } 1282 1283 bool HasDependentArg = false; 1284 for (unsigned i = 0; i < NumArgs; i++) 1285 HasDependentArg |= Args[i]->isTypeDependent(); 1286 1287 QualType FieldType = Member->getType(); 1288 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1289 FieldType = Array->getElementType(); 1290 if (FieldType->isDependentType() || HasDependentArg) { 1291 // Can't check initialization for a member of dependent type or when 1292 // any of the arguments are type-dependent expressions. 1293 OwningExprResult Init 1294 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1295 RParenLoc)); 1296 1297 // Erase any temporaries within this evaluation context; we're not 1298 // going to track them in the AST, since we'll be rebuilding the 1299 // ASTs during template instantiation. 1300 ExprTemporaries.erase( 1301 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1302 ExprTemporaries.end()); 1303 1304 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1305 LParenLoc, 1306 Init.takeAs<Expr>(), 1307 RParenLoc); 1308 1309 } 1310 1311 if (Member->isInvalidDecl()) 1312 return true; 1313 1314 // Initialize the member. 1315 InitializedEntity MemberEntity = 1316 InitializedEntity::InitializeMember(Member, 0); 1317 InitializationKind Kind = 1318 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1319 1320 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1321 1322 OwningExprResult MemberInit = 1323 InitSeq.Perform(*this, MemberEntity, Kind, 1324 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1325 if (MemberInit.isInvalid()) 1326 return true; 1327 1328 // C++0x [class.base.init]p7: 1329 // The initialization of each base and member constitutes a 1330 // full-expression. 1331 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1332 if (MemberInit.isInvalid()) 1333 return true; 1334 1335 // If we are in a dependent context, template instantiation will 1336 // perform this type-checking again. Just save the arguments that we 1337 // received in a ParenListExpr. 1338 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1339 // of the information that we have about the member 1340 // initializer. However, deconstructing the ASTs is a dicey process, 1341 // and this approach is far more likely to get the corner cases right. 1342 if (CurContext->isDependentContext()) { 1343 // Bump the reference count of all of the arguments. 1344 for (unsigned I = 0; I != NumArgs; ++I) 1345 Args[I]->Retain(); 1346 1347 OwningExprResult Init 1348 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1349 RParenLoc)); 1350 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1351 LParenLoc, 1352 Init.takeAs<Expr>(), 1353 RParenLoc); 1354 } 1355 1356 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1357 LParenLoc, 1358 MemberInit.takeAs<Expr>(), 1359 RParenLoc); 1360} 1361 1362Sema::MemInitResult 1363Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1364 Expr **Args, unsigned NumArgs, 1365 SourceLocation LParenLoc, SourceLocation RParenLoc, 1366 CXXRecordDecl *ClassDecl) { 1367 bool HasDependentArg = false; 1368 for (unsigned i = 0; i < NumArgs; i++) 1369 HasDependentArg |= Args[i]->isTypeDependent(); 1370 1371 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1372 if (BaseType->isDependentType() || HasDependentArg) { 1373 // Can't check initialization for a base of dependent type or when 1374 // any of the arguments are type-dependent expressions. 1375 OwningExprResult BaseInit 1376 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1377 RParenLoc)); 1378 1379 // Erase any temporaries within this evaluation context; we're not 1380 // going to track them in the AST, since we'll be rebuilding the 1381 // ASTs during template instantiation. 1382 ExprTemporaries.erase( 1383 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1384 ExprTemporaries.end()); 1385 1386 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1387 /*IsVirtual=*/false, 1388 LParenLoc, 1389 BaseInit.takeAs<Expr>(), 1390 RParenLoc); 1391 } 1392 1393 if (!BaseType->isRecordType()) 1394 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1395 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1396 1397 // C++ [class.base.init]p2: 1398 // [...] Unless the mem-initializer-id names a nonstatic data 1399 // member of the constructor’s class or a direct or virtual base 1400 // of that class, the mem-initializer is ill-formed. A 1401 // mem-initializer-list can initialize a base class using any 1402 // name that denotes that base class type. 1403 1404 // Check for direct and virtual base classes. 1405 const CXXBaseSpecifier *DirectBaseSpec = 0; 1406 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1407 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1408 VirtualBaseSpec); 1409 1410 // C++ [base.class.init]p2: 1411 // If a mem-initializer-id is ambiguous because it designates both 1412 // a direct non-virtual base class and an inherited virtual base 1413 // class, the mem-initializer is ill-formed. 1414 if (DirectBaseSpec && VirtualBaseSpec) 1415 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1416 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1417 // C++ [base.class.init]p2: 1418 // Unless the mem-initializer-id names a nonstatic data membeer of the 1419 // constructor's class ot a direst or virtual base of that class, the 1420 // mem-initializer is ill-formed. 1421 if (!DirectBaseSpec && !VirtualBaseSpec) 1422 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1423 << BaseType << Context.getTypeDeclType(ClassDecl) 1424 << BaseTInfo->getTypeLoc().getSourceRange(); 1425 1426 CXXBaseSpecifier *BaseSpec 1427 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1428 if (!BaseSpec) 1429 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1430 1431 // Initialize the base. 1432 InitializedEntity BaseEntity = 1433 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1434 InitializationKind Kind = 1435 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1436 1437 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1438 1439 OwningExprResult BaseInit = 1440 InitSeq.Perform(*this, BaseEntity, Kind, 1441 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1442 if (BaseInit.isInvalid()) 1443 return true; 1444 1445 // C++0x [class.base.init]p7: 1446 // The initialization of each base and member constitutes a 1447 // full-expression. 1448 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1449 if (BaseInit.isInvalid()) 1450 return true; 1451 1452 // If we are in a dependent context, template instantiation will 1453 // perform this type-checking again. Just save the arguments that we 1454 // received in a ParenListExpr. 1455 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1456 // of the information that we have about the base 1457 // initializer. However, deconstructing the ASTs is a dicey process, 1458 // and this approach is far more likely to get the corner cases right. 1459 if (CurContext->isDependentContext()) { 1460 // Bump the reference count of all of the arguments. 1461 for (unsigned I = 0; I != NumArgs; ++I) 1462 Args[I]->Retain(); 1463 1464 OwningExprResult Init 1465 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1466 RParenLoc)); 1467 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1468 BaseSpec->isVirtual(), 1469 LParenLoc, 1470 Init.takeAs<Expr>(), 1471 RParenLoc); 1472 } 1473 1474 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1475 BaseSpec->isVirtual(), 1476 LParenLoc, 1477 BaseInit.takeAs<Expr>(), 1478 RParenLoc); 1479} 1480 1481/// ImplicitInitializerKind - How an implicit base or member initializer should 1482/// initialize its base or member. 1483enum ImplicitInitializerKind { 1484 IIK_Default, 1485 IIK_Copy, 1486 IIK_Move 1487}; 1488 1489static bool 1490BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1491 ImplicitInitializerKind ImplicitInitKind, 1492 CXXBaseSpecifier *BaseSpec, 1493 bool IsInheritedVirtualBase, 1494 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1495 InitializedEntity InitEntity 1496 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1497 IsInheritedVirtualBase); 1498 1499 Sema::OwningExprResult BaseInit(SemaRef); 1500 1501 switch (ImplicitInitKind) { 1502 case IIK_Default: { 1503 InitializationKind InitKind 1504 = InitializationKind::CreateDefault(Constructor->getLocation()); 1505 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1506 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1507 Sema::MultiExprArg(SemaRef, 0, 0)); 1508 break; 1509 } 1510 1511 case IIK_Copy: { 1512 ParmVarDecl *Param = Constructor->getParamDecl(0); 1513 QualType ParamType = Param->getType().getNonReferenceType(); 1514 1515 Expr *CopyCtorArg = 1516 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1517 Constructor->getLocation(), ParamType, 0); 1518 1519 // Cast to the base class to avoid ambiguities. 1520 QualType ArgTy = 1521 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1522 ParamType.getQualifiers()); 1523 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1524 CastExpr::CK_UncheckedDerivedToBase, 1525 /*isLvalue=*/true, 1526 CXXBaseSpecifierArray(BaseSpec)); 1527 1528 InitializationKind InitKind 1529 = InitializationKind::CreateDirect(Constructor->getLocation(), 1530 SourceLocation(), SourceLocation()); 1531 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1532 &CopyCtorArg, 1); 1533 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1534 Sema::MultiExprArg(SemaRef, 1535 (void**)&CopyCtorArg, 1)); 1536 break; 1537 } 1538 1539 case IIK_Move: 1540 assert(false && "Unhandled initializer kind!"); 1541 } 1542 1543 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1544 if (BaseInit.isInvalid()) 1545 return true; 1546 1547 CXXBaseInit = 1548 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1549 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1550 SourceLocation()), 1551 BaseSpec->isVirtual(), 1552 SourceLocation(), 1553 BaseInit.takeAs<Expr>(), 1554 SourceLocation()); 1555 1556 return false; 1557} 1558 1559static bool 1560BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1561 ImplicitInitializerKind ImplicitInitKind, 1562 FieldDecl *Field, 1563 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1564 if (ImplicitInitKind == IIK_Copy) { 1565 SourceLocation Loc = Constructor->getLocation(); 1566 ParmVarDecl *Param = Constructor->getParamDecl(0); 1567 QualType ParamType = Param->getType().getNonReferenceType(); 1568 1569 Expr *MemberExprBase = 1570 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1571 Loc, ParamType, 0); 1572 1573 // Build a reference to this field within the parameter. 1574 CXXScopeSpec SS; 1575 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1576 Sema::LookupMemberName); 1577 MemberLookup.addDecl(Field, AS_public); 1578 MemberLookup.resolveKind(); 1579 Sema::OwningExprResult CopyCtorArg 1580 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1581 ParamType, Loc, 1582 /*IsArrow=*/false, 1583 SS, 1584 /*FirstQualifierInScope=*/0, 1585 MemberLookup, 1586 /*TemplateArgs=*/0); 1587 if (CopyCtorArg.isInvalid()) 1588 return true; 1589 1590 // When the field we are copying is an array, create index variables for 1591 // each dimension of the array. We use these index variables to subscript 1592 // the source array, and other clients (e.g., CodeGen) will perform the 1593 // necessary iteration with these index variables. 1594 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1595 QualType BaseType = Field->getType(); 1596 QualType SizeType = SemaRef.Context.getSizeType(); 1597 while (const ConstantArrayType *Array 1598 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1599 // Create the iteration variable for this array index. 1600 IdentifierInfo *IterationVarName = 0; 1601 { 1602 llvm::SmallString<8> Str; 1603 llvm::raw_svector_ostream OS(Str); 1604 OS << "__i" << IndexVariables.size(); 1605 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1606 } 1607 VarDecl *IterationVar 1608 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1609 IterationVarName, SizeType, 1610 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1611 VarDecl::None, VarDecl::None); 1612 IndexVariables.push_back(IterationVar); 1613 1614 // Create a reference to the iteration variable. 1615 Sema::OwningExprResult IterationVarRef 1616 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1617 assert(!IterationVarRef.isInvalid() && 1618 "Reference to invented variable cannot fail!"); 1619 1620 // Subscript the array with this iteration variable. 1621 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1622 Loc, 1623 move(IterationVarRef), 1624 Loc); 1625 if (CopyCtorArg.isInvalid()) 1626 return true; 1627 1628 BaseType = Array->getElementType(); 1629 } 1630 1631 // Construct the entity that we will be initializing. For an array, this 1632 // will be first element in the array, which may require several levels 1633 // of array-subscript entities. 1634 llvm::SmallVector<InitializedEntity, 4> Entities; 1635 Entities.reserve(1 + IndexVariables.size()); 1636 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1637 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1638 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1639 0, 1640 Entities.back())); 1641 1642 // Direct-initialize to use the copy constructor. 1643 InitializationKind InitKind = 1644 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1645 1646 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1647 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1648 &CopyCtorArgE, 1); 1649 1650 Sema::OwningExprResult MemberInit 1651 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1652 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1653 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1654 if (MemberInit.isInvalid()) 1655 return true; 1656 1657 CXXMemberInit 1658 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1659 MemberInit.takeAs<Expr>(), Loc, 1660 IndexVariables.data(), 1661 IndexVariables.size()); 1662 return false; 1663 } 1664 1665 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1666 1667 QualType FieldBaseElementType = 1668 SemaRef.Context.getBaseElementType(Field->getType()); 1669 1670 if (FieldBaseElementType->isRecordType()) { 1671 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1672 InitializationKind InitKind = 1673 InitializationKind::CreateDefault(Constructor->getLocation()); 1674 1675 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1676 Sema::OwningExprResult MemberInit = 1677 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1678 Sema::MultiExprArg(SemaRef, 0, 0)); 1679 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1680 if (MemberInit.isInvalid()) 1681 return true; 1682 1683 CXXMemberInit = 1684 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1685 Field, SourceLocation(), 1686 SourceLocation(), 1687 MemberInit.takeAs<Expr>(), 1688 SourceLocation()); 1689 return false; 1690 } 1691 1692 if (FieldBaseElementType->isReferenceType()) { 1693 SemaRef.Diag(Constructor->getLocation(), 1694 diag::err_uninitialized_member_in_ctor) 1695 << (int)Constructor->isImplicit() 1696 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1697 << 0 << Field->getDeclName(); 1698 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1699 return true; 1700 } 1701 1702 if (FieldBaseElementType.isConstQualified()) { 1703 SemaRef.Diag(Constructor->getLocation(), 1704 diag::err_uninitialized_member_in_ctor) 1705 << (int)Constructor->isImplicit() 1706 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1707 << 1 << Field->getDeclName(); 1708 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1709 return true; 1710 } 1711 1712 // Nothing to initialize. 1713 CXXMemberInit = 0; 1714 return false; 1715} 1716 1717bool 1718Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1719 CXXBaseOrMemberInitializer **Initializers, 1720 unsigned NumInitializers, 1721 bool AnyErrors) { 1722 if (Constructor->getDeclContext()->isDependentContext()) { 1723 // Just store the initializers as written, they will be checked during 1724 // instantiation. 1725 if (NumInitializers > 0) { 1726 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1727 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1728 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1729 memcpy(baseOrMemberInitializers, Initializers, 1730 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1731 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1732 } 1733 1734 return false; 1735 } 1736 1737 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1738 1739 // FIXME: Handle implicit move constructors. 1740 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1741 ImplicitInitKind = IIK_Copy; 1742 1743 // We need to build the initializer AST according to order of construction 1744 // and not what user specified in the Initializers list. 1745 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1746 if (!ClassDecl) 1747 return true; 1748 1749 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1750 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1751 bool HadError = false; 1752 1753 for (unsigned i = 0; i < NumInitializers; i++) { 1754 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1755 1756 if (Member->isBaseInitializer()) 1757 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1758 else 1759 AllBaseFields[Member->getMember()] = Member; 1760 } 1761 1762 // Keep track of the direct virtual bases. 1763 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1764 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1765 E = ClassDecl->bases_end(); I != E; ++I) { 1766 if (I->isVirtual()) 1767 DirectVBases.insert(I); 1768 } 1769 1770 // Push virtual bases before others. 1771 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1772 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1773 1774 if (CXXBaseOrMemberInitializer *Value 1775 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1776 AllToInit.push_back(Value); 1777 } else if (!AnyErrors) { 1778 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1779 CXXBaseOrMemberInitializer *CXXBaseInit; 1780 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1781 VBase, IsInheritedVirtualBase, 1782 CXXBaseInit)) { 1783 HadError = true; 1784 continue; 1785 } 1786 1787 AllToInit.push_back(CXXBaseInit); 1788 } 1789 } 1790 1791 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1792 E = ClassDecl->bases_end(); Base != E; ++Base) { 1793 // Virtuals are in the virtual base list and already constructed. 1794 if (Base->isVirtual()) 1795 continue; 1796 1797 if (CXXBaseOrMemberInitializer *Value 1798 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1799 AllToInit.push_back(Value); 1800 } else if (!AnyErrors) { 1801 CXXBaseOrMemberInitializer *CXXBaseInit; 1802 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1803 Base, /*IsInheritedVirtualBase=*/false, 1804 CXXBaseInit)) { 1805 HadError = true; 1806 continue; 1807 } 1808 1809 AllToInit.push_back(CXXBaseInit); 1810 } 1811 } 1812 1813 // non-static data members. 1814 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1815 E = ClassDecl->field_end(); Field != E; ++Field) { 1816 if ((*Field)->isAnonymousStructOrUnion()) { 1817 if (const RecordType *FieldClassType = 1818 Field->getType()->getAs<RecordType>()) { 1819 CXXRecordDecl *FieldClassDecl 1820 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1821 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1822 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1823 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1824 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1825 // set to the anonymous union data member used in the initializer 1826 // list. 1827 Value->setMember(*Field); 1828 Value->setAnonUnionMember(*FA); 1829 AllToInit.push_back(Value); 1830 break; 1831 } 1832 } 1833 } 1834 1835 if (ImplicitInitKind == IIK_Default) 1836 continue; 1837 } 1838 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1839 AllToInit.push_back(Value); 1840 continue; 1841 } 1842 1843 if (AnyErrors) 1844 continue; 1845 1846 CXXBaseOrMemberInitializer *Member; 1847 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1848 *Field, Member)) { 1849 HadError = true; 1850 continue; 1851 } 1852 1853 // If the member doesn't need to be initialized, it will be null. 1854 if (Member) 1855 AllToInit.push_back(Member); 1856 } 1857 1858 NumInitializers = AllToInit.size(); 1859 if (NumInitializers > 0) { 1860 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1861 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1862 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1863 memcpy(baseOrMemberInitializers, AllToInit.data(), 1864 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1865 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1866 1867 // Constructors implicitly reference the base and member 1868 // destructors. 1869 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1870 Constructor->getParent()); 1871 } 1872 1873 return HadError; 1874} 1875 1876static void *GetKeyForTopLevelField(FieldDecl *Field) { 1877 // For anonymous unions, use the class declaration as the key. 1878 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1879 if (RT->getDecl()->isAnonymousStructOrUnion()) 1880 return static_cast<void *>(RT->getDecl()); 1881 } 1882 return static_cast<void *>(Field); 1883} 1884 1885static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1886 return Context.getCanonicalType(BaseType).getTypePtr(); 1887} 1888 1889static void *GetKeyForMember(ASTContext &Context, 1890 CXXBaseOrMemberInitializer *Member, 1891 bool MemberMaybeAnon = false) { 1892 if (!Member->isMemberInitializer()) 1893 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1894 1895 // For fields injected into the class via declaration of an anonymous union, 1896 // use its anonymous union class declaration as the unique key. 1897 FieldDecl *Field = Member->getMember(); 1898 1899 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1900 // data member of the class. Data member used in the initializer list is 1901 // in AnonUnionMember field. 1902 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1903 Field = Member->getAnonUnionMember(); 1904 1905 // If the field is a member of an anonymous struct or union, our key 1906 // is the anonymous record decl that's a direct child of the class. 1907 RecordDecl *RD = Field->getParent(); 1908 if (RD->isAnonymousStructOrUnion()) { 1909 while (true) { 1910 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1911 if (Parent->isAnonymousStructOrUnion()) 1912 RD = Parent; 1913 else 1914 break; 1915 } 1916 1917 return static_cast<void *>(RD); 1918 } 1919 1920 return static_cast<void *>(Field); 1921} 1922 1923static void 1924DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1925 const CXXConstructorDecl *Constructor, 1926 CXXBaseOrMemberInitializer **Inits, 1927 unsigned NumInits) { 1928 if (Constructor->getDeclContext()->isDependentContext()) 1929 return; 1930 1931 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1932 == Diagnostic::Ignored) 1933 return; 1934 1935 // Build the list of bases and members in the order that they'll 1936 // actually be initialized. The explicit initializers should be in 1937 // this same order but may be missing things. 1938 llvm::SmallVector<const void*, 32> IdealInitKeys; 1939 1940 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1941 1942 // 1. Virtual bases. 1943 for (CXXRecordDecl::base_class_const_iterator VBase = 1944 ClassDecl->vbases_begin(), 1945 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1946 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1947 1948 // 2. Non-virtual bases. 1949 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1950 E = ClassDecl->bases_end(); Base != E; ++Base) { 1951 if (Base->isVirtual()) 1952 continue; 1953 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1954 } 1955 1956 // 3. Direct fields. 1957 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1958 E = ClassDecl->field_end(); Field != E; ++Field) 1959 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1960 1961 unsigned NumIdealInits = IdealInitKeys.size(); 1962 unsigned IdealIndex = 0; 1963 1964 CXXBaseOrMemberInitializer *PrevInit = 0; 1965 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1966 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1967 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1968 1969 // Scan forward to try to find this initializer in the idealized 1970 // initializers list. 1971 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1972 if (InitKey == IdealInitKeys[IdealIndex]) 1973 break; 1974 1975 // If we didn't find this initializer, it must be because we 1976 // scanned past it on a previous iteration. That can only 1977 // happen if we're out of order; emit a warning. 1978 if (IdealIndex == NumIdealInits) { 1979 assert(PrevInit && "initializer not found in initializer list"); 1980 1981 Sema::SemaDiagnosticBuilder D = 1982 SemaRef.Diag(PrevInit->getSourceLocation(), 1983 diag::warn_initializer_out_of_order); 1984 1985 if (PrevInit->isMemberInitializer()) 1986 D << 0 << PrevInit->getMember()->getDeclName(); 1987 else 1988 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1989 1990 if (Init->isMemberInitializer()) 1991 D << 0 << Init->getMember()->getDeclName(); 1992 else 1993 D << 1 << Init->getBaseClassInfo()->getType(); 1994 1995 // Move back to the initializer's location in the ideal list. 1996 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1997 if (InitKey == IdealInitKeys[IdealIndex]) 1998 break; 1999 2000 assert(IdealIndex != NumIdealInits && 2001 "initializer not found in initializer list"); 2002 } 2003 2004 PrevInit = Init; 2005 } 2006} 2007 2008namespace { 2009bool CheckRedundantInit(Sema &S, 2010 CXXBaseOrMemberInitializer *Init, 2011 CXXBaseOrMemberInitializer *&PrevInit) { 2012 if (!PrevInit) { 2013 PrevInit = Init; 2014 return false; 2015 } 2016 2017 if (FieldDecl *Field = Init->getMember()) 2018 S.Diag(Init->getSourceLocation(), 2019 diag::err_multiple_mem_initialization) 2020 << Field->getDeclName() 2021 << Init->getSourceRange(); 2022 else { 2023 Type *BaseClass = Init->getBaseClass(); 2024 assert(BaseClass && "neither field nor base"); 2025 S.Diag(Init->getSourceLocation(), 2026 diag::err_multiple_base_initialization) 2027 << QualType(BaseClass, 0) 2028 << Init->getSourceRange(); 2029 } 2030 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2031 << 0 << PrevInit->getSourceRange(); 2032 2033 return true; 2034} 2035 2036typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2037typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2038 2039bool CheckRedundantUnionInit(Sema &S, 2040 CXXBaseOrMemberInitializer *Init, 2041 RedundantUnionMap &Unions) { 2042 FieldDecl *Field = Init->getMember(); 2043 RecordDecl *Parent = Field->getParent(); 2044 if (!Parent->isAnonymousStructOrUnion()) 2045 return false; 2046 2047 NamedDecl *Child = Field; 2048 do { 2049 if (Parent->isUnion()) { 2050 UnionEntry &En = Unions[Parent]; 2051 if (En.first && En.first != Child) { 2052 S.Diag(Init->getSourceLocation(), 2053 diag::err_multiple_mem_union_initialization) 2054 << Field->getDeclName() 2055 << Init->getSourceRange(); 2056 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2057 << 0 << En.second->getSourceRange(); 2058 return true; 2059 } else if (!En.first) { 2060 En.first = Child; 2061 En.second = Init; 2062 } 2063 } 2064 2065 Child = Parent; 2066 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2067 } while (Parent->isAnonymousStructOrUnion()); 2068 2069 return false; 2070} 2071} 2072 2073/// ActOnMemInitializers - Handle the member initializers for a constructor. 2074void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2075 SourceLocation ColonLoc, 2076 MemInitTy **meminits, unsigned NumMemInits, 2077 bool AnyErrors) { 2078 if (!ConstructorDecl) 2079 return; 2080 2081 AdjustDeclIfTemplate(ConstructorDecl); 2082 2083 CXXConstructorDecl *Constructor 2084 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2085 2086 if (!Constructor) { 2087 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2088 return; 2089 } 2090 2091 CXXBaseOrMemberInitializer **MemInits = 2092 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2093 2094 // Mapping for the duplicate initializers check. 2095 // For member initializers, this is keyed with a FieldDecl*. 2096 // For base initializers, this is keyed with a Type*. 2097 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2098 2099 // Mapping for the inconsistent anonymous-union initializers check. 2100 RedundantUnionMap MemberUnions; 2101 2102 bool HadError = false; 2103 for (unsigned i = 0; i < NumMemInits; i++) { 2104 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2105 2106 if (Init->isMemberInitializer()) { 2107 FieldDecl *Field = Init->getMember(); 2108 if (CheckRedundantInit(*this, Init, Members[Field]) || 2109 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2110 HadError = true; 2111 } else { 2112 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2113 if (CheckRedundantInit(*this, Init, Members[Key])) 2114 HadError = true; 2115 } 2116 } 2117 2118 if (HadError) 2119 return; 2120 2121 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2122 2123 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2124} 2125 2126void 2127Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2128 CXXRecordDecl *ClassDecl) { 2129 // Ignore dependent contexts. 2130 if (ClassDecl->isDependentContext()) 2131 return; 2132 2133 // FIXME: all the access-control diagnostics are positioned on the 2134 // field/base declaration. That's probably good; that said, the 2135 // user might reasonably want to know why the destructor is being 2136 // emitted, and we currently don't say. 2137 2138 // Non-static data members. 2139 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2140 E = ClassDecl->field_end(); I != E; ++I) { 2141 FieldDecl *Field = *I; 2142 if (Field->isInvalidDecl()) 2143 continue; 2144 QualType FieldType = Context.getBaseElementType(Field->getType()); 2145 2146 const RecordType* RT = FieldType->getAs<RecordType>(); 2147 if (!RT) 2148 continue; 2149 2150 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2151 if (FieldClassDecl->hasTrivialDestructor()) 2152 continue; 2153 2154 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2155 CheckDestructorAccess(Field->getLocation(), Dtor, 2156 PDiag(diag::err_access_dtor_field) 2157 << Field->getDeclName() 2158 << FieldType); 2159 2160 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2161 } 2162 2163 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2164 2165 // Bases. 2166 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2167 E = ClassDecl->bases_end(); Base != E; ++Base) { 2168 // Bases are always records in a well-formed non-dependent class. 2169 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2170 2171 // Remember direct virtual bases. 2172 if (Base->isVirtual()) 2173 DirectVirtualBases.insert(RT); 2174 2175 // Ignore trivial destructors. 2176 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2177 if (BaseClassDecl->hasTrivialDestructor()) 2178 continue; 2179 2180 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2181 2182 // FIXME: caret should be on the start of the class name 2183 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2184 PDiag(diag::err_access_dtor_base) 2185 << Base->getType() 2186 << Base->getSourceRange()); 2187 2188 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2189 } 2190 2191 // Virtual bases. 2192 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2193 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2194 2195 // Bases are always records in a well-formed non-dependent class. 2196 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2197 2198 // Ignore direct virtual bases. 2199 if (DirectVirtualBases.count(RT)) 2200 continue; 2201 2202 // Ignore trivial destructors. 2203 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2204 if (BaseClassDecl->hasTrivialDestructor()) 2205 continue; 2206 2207 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2208 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2209 PDiag(diag::err_access_dtor_vbase) 2210 << VBase->getType()); 2211 2212 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2213 } 2214} 2215 2216void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2217 if (!CDtorDecl) 2218 return; 2219 2220 if (CXXConstructorDecl *Constructor 2221 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2222 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2223} 2224 2225bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2226 unsigned DiagID, AbstractDiagSelID SelID, 2227 const CXXRecordDecl *CurrentRD) { 2228 if (SelID == -1) 2229 return RequireNonAbstractType(Loc, T, 2230 PDiag(DiagID), CurrentRD); 2231 else 2232 return RequireNonAbstractType(Loc, T, 2233 PDiag(DiagID) << SelID, CurrentRD); 2234} 2235 2236bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2237 const PartialDiagnostic &PD, 2238 const CXXRecordDecl *CurrentRD) { 2239 if (!getLangOptions().CPlusPlus) 2240 return false; 2241 2242 if (const ArrayType *AT = Context.getAsArrayType(T)) 2243 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2244 CurrentRD); 2245 2246 if (const PointerType *PT = T->getAs<PointerType>()) { 2247 // Find the innermost pointer type. 2248 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2249 PT = T; 2250 2251 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2252 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2253 } 2254 2255 const RecordType *RT = T->getAs<RecordType>(); 2256 if (!RT) 2257 return false; 2258 2259 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2260 2261 if (CurrentRD && CurrentRD != RD) 2262 return false; 2263 2264 // FIXME: is this reasonable? It matches current behavior, but.... 2265 if (!RD->getDefinition()) 2266 return false; 2267 2268 if (!RD->isAbstract()) 2269 return false; 2270 2271 Diag(Loc, PD) << RD->getDeclName(); 2272 2273 // Check if we've already emitted the list of pure virtual functions for this 2274 // class. 2275 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2276 return true; 2277 2278 CXXFinalOverriderMap FinalOverriders; 2279 RD->getFinalOverriders(FinalOverriders); 2280 2281 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2282 MEnd = FinalOverriders.end(); 2283 M != MEnd; 2284 ++M) { 2285 for (OverridingMethods::iterator SO = M->second.begin(), 2286 SOEnd = M->second.end(); 2287 SO != SOEnd; ++SO) { 2288 // C++ [class.abstract]p4: 2289 // A class is abstract if it contains or inherits at least one 2290 // pure virtual function for which the final overrider is pure 2291 // virtual. 2292 2293 // 2294 if (SO->second.size() != 1) 2295 continue; 2296 2297 if (!SO->second.front().Method->isPure()) 2298 continue; 2299 2300 Diag(SO->second.front().Method->getLocation(), 2301 diag::note_pure_virtual_function) 2302 << SO->second.front().Method->getDeclName(); 2303 } 2304 } 2305 2306 if (!PureVirtualClassDiagSet) 2307 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2308 PureVirtualClassDiagSet->insert(RD); 2309 2310 return true; 2311} 2312 2313namespace { 2314 class AbstractClassUsageDiagnoser 2315 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2316 Sema &SemaRef; 2317 CXXRecordDecl *AbstractClass; 2318 2319 bool VisitDeclContext(const DeclContext *DC) { 2320 bool Invalid = false; 2321 2322 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2323 E = DC->decls_end(); I != E; ++I) 2324 Invalid |= Visit(*I); 2325 2326 return Invalid; 2327 } 2328 2329 public: 2330 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2331 : SemaRef(SemaRef), AbstractClass(ac) { 2332 Visit(SemaRef.Context.getTranslationUnitDecl()); 2333 } 2334 2335 bool VisitFunctionDecl(const FunctionDecl *FD) { 2336 if (FD->isThisDeclarationADefinition()) { 2337 // No need to do the check if we're in a definition, because it requires 2338 // that the return/param types are complete. 2339 // because that requires 2340 return VisitDeclContext(FD); 2341 } 2342 2343 // Check the return type. 2344 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2345 bool Invalid = 2346 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2347 diag::err_abstract_type_in_decl, 2348 Sema::AbstractReturnType, 2349 AbstractClass); 2350 2351 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2352 E = FD->param_end(); I != E; ++I) { 2353 const ParmVarDecl *VD = *I; 2354 Invalid |= 2355 SemaRef.RequireNonAbstractType(VD->getLocation(), 2356 VD->getOriginalType(), 2357 diag::err_abstract_type_in_decl, 2358 Sema::AbstractParamType, 2359 AbstractClass); 2360 } 2361 2362 return Invalid; 2363 } 2364 2365 bool VisitDecl(const Decl* D) { 2366 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2367 return VisitDeclContext(DC); 2368 2369 return false; 2370 } 2371 }; 2372} 2373 2374/// \brief Perform semantic checks on a class definition that has been 2375/// completing, introducing implicitly-declared members, checking for 2376/// abstract types, etc. 2377void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2378 if (!Record || Record->isInvalidDecl()) 2379 return; 2380 2381 if (!Record->isDependentType()) 2382 AddImplicitlyDeclaredMembersToClass(S, Record); 2383 2384 if (Record->isInvalidDecl()) 2385 return; 2386 2387 // Set access bits correctly on the directly-declared conversions. 2388 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2389 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2390 Convs->setAccess(I, (*I)->getAccess()); 2391 2392 // Determine whether we need to check for final overriders. We do 2393 // this either when there are virtual base classes (in which case we 2394 // may end up finding multiple final overriders for a given virtual 2395 // function) or any of the base classes is abstract (in which case 2396 // we might detect that this class is abstract). 2397 bool CheckFinalOverriders = false; 2398 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2399 !Record->isDependentType()) { 2400 if (Record->getNumVBases()) 2401 CheckFinalOverriders = true; 2402 else if (!Record->isAbstract()) { 2403 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2404 BEnd = Record->bases_end(); 2405 B != BEnd; ++B) { 2406 CXXRecordDecl *BaseDecl 2407 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2408 if (BaseDecl->isAbstract()) { 2409 CheckFinalOverriders = true; 2410 break; 2411 } 2412 } 2413 } 2414 } 2415 2416 if (CheckFinalOverriders) { 2417 CXXFinalOverriderMap FinalOverriders; 2418 Record->getFinalOverriders(FinalOverriders); 2419 2420 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2421 MEnd = FinalOverriders.end(); 2422 M != MEnd; ++M) { 2423 for (OverridingMethods::iterator SO = M->second.begin(), 2424 SOEnd = M->second.end(); 2425 SO != SOEnd; ++SO) { 2426 assert(SO->second.size() > 0 && 2427 "All virtual functions have overridding virtual functions"); 2428 if (SO->second.size() == 1) { 2429 // C++ [class.abstract]p4: 2430 // A class is abstract if it contains or inherits at least one 2431 // pure virtual function for which the final overrider is pure 2432 // virtual. 2433 if (SO->second.front().Method->isPure()) 2434 Record->setAbstract(true); 2435 continue; 2436 } 2437 2438 // C++ [class.virtual]p2: 2439 // In a derived class, if a virtual member function of a base 2440 // class subobject has more than one final overrider the 2441 // program is ill-formed. 2442 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2443 << (NamedDecl *)M->first << Record; 2444 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2445 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2446 OMEnd = SO->second.end(); 2447 OM != OMEnd; ++OM) 2448 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2449 << (NamedDecl *)M->first << OM->Method->getParent(); 2450 2451 Record->setInvalidDecl(); 2452 } 2453 } 2454 } 2455 2456 if (Record->isAbstract() && !Record->isInvalidDecl()) 2457 (void)AbstractClassUsageDiagnoser(*this, Record); 2458 2459 // If this is not an aggregate type and has no user-declared constructor, 2460 // complain about any non-static data members of reference or const scalar 2461 // type, since they will never get initializers. 2462 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2463 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2464 bool Complained = false; 2465 for (RecordDecl::field_iterator F = Record->field_begin(), 2466 FEnd = Record->field_end(); 2467 F != FEnd; ++F) { 2468 if (F->getType()->isReferenceType() || 2469 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2470 if (!Complained) { 2471 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2472 << Record->getTagKind() << Record; 2473 Complained = true; 2474 } 2475 2476 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2477 << F->getType()->isReferenceType() 2478 << F->getDeclName(); 2479 } 2480 } 2481 } 2482 2483 if (Record->isDynamicClass()) 2484 DynamicClasses.push_back(Record); 2485} 2486 2487void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2488 DeclPtrTy TagDecl, 2489 SourceLocation LBrac, 2490 SourceLocation RBrac, 2491 AttributeList *AttrList) { 2492 if (!TagDecl) 2493 return; 2494 2495 AdjustDeclIfTemplate(TagDecl); 2496 2497 ActOnFields(S, RLoc, TagDecl, 2498 (DeclPtrTy*)FieldCollector->getCurFields(), 2499 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2500 2501 CheckCompletedCXXClass(S, 2502 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2503} 2504 2505/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2506/// special functions, such as the default constructor, copy 2507/// constructor, or destructor, to the given C++ class (C++ 2508/// [special]p1). This routine can only be executed just before the 2509/// definition of the class is complete. 2510/// 2511/// The scope, if provided, is the class scope. 2512void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2513 CXXRecordDecl *ClassDecl) { 2514 CanQualType ClassType 2515 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2516 2517 // FIXME: Implicit declarations have exception specifications, which are 2518 // the union of the specifications of the implicitly called functions. 2519 2520 if (!ClassDecl->hasUserDeclaredConstructor()) { 2521 // C++ [class.ctor]p5: 2522 // A default constructor for a class X is a constructor of class X 2523 // that can be called without an argument. If there is no 2524 // user-declared constructor for class X, a default constructor is 2525 // implicitly declared. An implicitly-declared default constructor 2526 // is an inline public member of its class. 2527 DeclarationName Name 2528 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2529 CXXConstructorDecl *DefaultCon = 2530 CXXConstructorDecl::Create(Context, ClassDecl, 2531 ClassDecl->getLocation(), Name, 2532 Context.getFunctionType(Context.VoidTy, 2533 0, 0, false, 0, 2534 /*FIXME*/false, false, 2535 0, 0, 2536 FunctionType::ExtInfo()), 2537 /*TInfo=*/0, 2538 /*isExplicit=*/false, 2539 /*isInline=*/true, 2540 /*isImplicitlyDeclared=*/true); 2541 DefaultCon->setAccess(AS_public); 2542 DefaultCon->setImplicit(); 2543 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2544 if (S) 2545 PushOnScopeChains(DefaultCon, S, true); 2546 else 2547 ClassDecl->addDecl(DefaultCon); 2548 } 2549 2550 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2551 // C++ [class.copy]p4: 2552 // If the class definition does not explicitly declare a copy 2553 // constructor, one is declared implicitly. 2554 2555 // C++ [class.copy]p5: 2556 // The implicitly-declared copy constructor for a class X will 2557 // have the form 2558 // 2559 // X::X(const X&) 2560 // 2561 // if 2562 bool HasConstCopyConstructor = true; 2563 2564 // -- each direct or virtual base class B of X has a copy 2565 // constructor whose first parameter is of type const B& or 2566 // const volatile B&, and 2567 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2568 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2569 const CXXRecordDecl *BaseClassDecl 2570 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2571 HasConstCopyConstructor 2572 = BaseClassDecl->hasConstCopyConstructor(Context); 2573 } 2574 2575 // -- for all the nonstatic data members of X that are of a 2576 // class type M (or array thereof), each such class type 2577 // has a copy constructor whose first parameter is of type 2578 // const M& or const volatile M&. 2579 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2580 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2581 ++Field) { 2582 QualType FieldType = (*Field)->getType(); 2583 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2584 FieldType = Array->getElementType(); 2585 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2586 const CXXRecordDecl *FieldClassDecl 2587 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2588 HasConstCopyConstructor 2589 = FieldClassDecl->hasConstCopyConstructor(Context); 2590 } 2591 } 2592 2593 // Otherwise, the implicitly declared copy constructor will have 2594 // the form 2595 // 2596 // X::X(X&) 2597 QualType ArgType = ClassType; 2598 if (HasConstCopyConstructor) 2599 ArgType = ArgType.withConst(); 2600 ArgType = Context.getLValueReferenceType(ArgType); 2601 2602 // An implicitly-declared copy constructor is an inline public 2603 // member of its class. 2604 DeclarationName Name 2605 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2606 CXXConstructorDecl *CopyConstructor 2607 = CXXConstructorDecl::Create(Context, ClassDecl, 2608 ClassDecl->getLocation(), Name, 2609 Context.getFunctionType(Context.VoidTy, 2610 &ArgType, 1, 2611 false, 0, 2612 /*FIXME: hasExceptionSpec*/false, 2613 false, 0, 0, 2614 FunctionType::ExtInfo()), 2615 /*TInfo=*/0, 2616 /*isExplicit=*/false, 2617 /*isInline=*/true, 2618 /*isImplicitlyDeclared=*/true); 2619 CopyConstructor->setAccess(AS_public); 2620 CopyConstructor->setImplicit(); 2621 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2622 2623 // Add the parameter to the constructor. 2624 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2625 ClassDecl->getLocation(), 2626 /*IdentifierInfo=*/0, 2627 ArgType, /*TInfo=*/0, 2628 VarDecl::None, 2629 VarDecl::None, 0); 2630 CopyConstructor->setParams(&FromParam, 1); 2631 if (S) 2632 PushOnScopeChains(CopyConstructor, S, true); 2633 else 2634 ClassDecl->addDecl(CopyConstructor); 2635 } 2636 2637 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2638 // Note: The following rules are largely analoguous to the copy 2639 // constructor rules. Note that virtual bases are not taken into account 2640 // for determining the argument type of the operator. Note also that 2641 // operators taking an object instead of a reference are allowed. 2642 // 2643 // C++ [class.copy]p10: 2644 // If the class definition does not explicitly declare a copy 2645 // assignment operator, one is declared implicitly. 2646 // The implicitly-defined copy assignment operator for a class X 2647 // will have the form 2648 // 2649 // X& X::operator=(const X&) 2650 // 2651 // if 2652 bool HasConstCopyAssignment = true; 2653 2654 // -- each direct base class B of X has a copy assignment operator 2655 // whose parameter is of type const B&, const volatile B& or B, 2656 // and 2657 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2658 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2659 assert(!Base->getType()->isDependentType() && 2660 "Cannot generate implicit members for class with dependent bases."); 2661 const CXXRecordDecl *BaseClassDecl 2662 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2663 const CXXMethodDecl *MD = 0; 2664 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2665 MD); 2666 } 2667 2668 // -- for all the nonstatic data members of X that are of a class 2669 // type M (or array thereof), each such class type has a copy 2670 // assignment operator whose parameter is of type const M&, 2671 // const volatile M& or M. 2672 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2673 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2674 ++Field) { 2675 QualType FieldType = (*Field)->getType(); 2676 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2677 FieldType = Array->getElementType(); 2678 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2679 const CXXRecordDecl *FieldClassDecl 2680 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2681 const CXXMethodDecl *MD = 0; 2682 HasConstCopyAssignment 2683 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2684 } 2685 } 2686 2687 // Otherwise, the implicitly declared copy assignment operator will 2688 // have the form 2689 // 2690 // X& X::operator=(X&) 2691 QualType ArgType = ClassType; 2692 QualType RetType = Context.getLValueReferenceType(ArgType); 2693 if (HasConstCopyAssignment) 2694 ArgType = ArgType.withConst(); 2695 ArgType = Context.getLValueReferenceType(ArgType); 2696 2697 // An implicitly-declared copy assignment operator is an inline public 2698 // member of its class. 2699 DeclarationName Name = 2700 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2701 CXXMethodDecl *CopyAssignment = 2702 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2703 Context.getFunctionType(RetType, &ArgType, 1, 2704 false, 0, 2705 /*FIXME: hasExceptionSpec*/false, 2706 false, 0, 0, 2707 FunctionType::ExtInfo()), 2708 /*TInfo=*/0, /*isStatic=*/false, 2709 /*StorageClassAsWritten=*/FunctionDecl::None, 2710 /*isInline=*/true); 2711 CopyAssignment->setAccess(AS_public); 2712 CopyAssignment->setImplicit(); 2713 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2714 CopyAssignment->setCopyAssignment(true); 2715 2716 // Add the parameter to the operator. 2717 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2718 ClassDecl->getLocation(), 2719 /*Id=*/0, 2720 ArgType, /*TInfo=*/0, 2721 VarDecl::None, 2722 VarDecl::None, 0); 2723 CopyAssignment->setParams(&FromParam, 1); 2724 2725 // Don't call addedAssignmentOperator. There is no way to distinguish an 2726 // implicit from an explicit assignment operator. 2727 if (S) 2728 PushOnScopeChains(CopyAssignment, S, true); 2729 else 2730 ClassDecl->addDecl(CopyAssignment); 2731 AddOverriddenMethods(ClassDecl, CopyAssignment); 2732 } 2733 2734 if (!ClassDecl->hasUserDeclaredDestructor()) { 2735 // C++ [class.dtor]p2: 2736 // If a class has no user-declared destructor, a destructor is 2737 // declared implicitly. An implicitly-declared destructor is an 2738 // inline public member of its class. 2739 QualType Ty = Context.getFunctionType(Context.VoidTy, 2740 0, 0, false, 0, 2741 /*FIXME: hasExceptionSpec*/false, 2742 false, 0, 0, FunctionType::ExtInfo()); 2743 2744 DeclarationName Name 2745 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2746 CXXDestructorDecl *Destructor 2747 = CXXDestructorDecl::Create(Context, ClassDecl, 2748 ClassDecl->getLocation(), Name, Ty, 2749 /*isInline=*/true, 2750 /*isImplicitlyDeclared=*/true); 2751 Destructor->setAccess(AS_public); 2752 Destructor->setImplicit(); 2753 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2754 if (S) 2755 PushOnScopeChains(Destructor, S, true); 2756 else 2757 ClassDecl->addDecl(Destructor); 2758 2759 // This could be uniqued if it ever proves significant. 2760 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2761 2762 AddOverriddenMethods(ClassDecl, Destructor); 2763 } 2764} 2765 2766void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2767 Decl *D = TemplateD.getAs<Decl>(); 2768 if (!D) 2769 return; 2770 2771 TemplateParameterList *Params = 0; 2772 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2773 Params = Template->getTemplateParameters(); 2774 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2775 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2776 Params = PartialSpec->getTemplateParameters(); 2777 else 2778 return; 2779 2780 for (TemplateParameterList::iterator Param = Params->begin(), 2781 ParamEnd = Params->end(); 2782 Param != ParamEnd; ++Param) { 2783 NamedDecl *Named = cast<NamedDecl>(*Param); 2784 if (Named->getDeclName()) { 2785 S->AddDecl(DeclPtrTy::make(Named)); 2786 IdResolver.AddDecl(Named); 2787 } 2788 } 2789} 2790 2791void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2792 if (!RecordD) return; 2793 AdjustDeclIfTemplate(RecordD); 2794 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2795 PushDeclContext(S, Record); 2796} 2797 2798void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2799 if (!RecordD) return; 2800 PopDeclContext(); 2801} 2802 2803/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2804/// parsing a top-level (non-nested) C++ class, and we are now 2805/// parsing those parts of the given Method declaration that could 2806/// not be parsed earlier (C++ [class.mem]p2), such as default 2807/// arguments. This action should enter the scope of the given 2808/// Method declaration as if we had just parsed the qualified method 2809/// name. However, it should not bring the parameters into scope; 2810/// that will be performed by ActOnDelayedCXXMethodParameter. 2811void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2812} 2813 2814/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2815/// C++ method declaration. We're (re-)introducing the given 2816/// function parameter into scope for use in parsing later parts of 2817/// the method declaration. For example, we could see an 2818/// ActOnParamDefaultArgument event for this parameter. 2819void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2820 if (!ParamD) 2821 return; 2822 2823 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2824 2825 // If this parameter has an unparsed default argument, clear it out 2826 // to make way for the parsed default argument. 2827 if (Param->hasUnparsedDefaultArg()) 2828 Param->setDefaultArg(0); 2829 2830 S->AddDecl(DeclPtrTy::make(Param)); 2831 if (Param->getDeclName()) 2832 IdResolver.AddDecl(Param); 2833} 2834 2835/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2836/// processing the delayed method declaration for Method. The method 2837/// declaration is now considered finished. There may be a separate 2838/// ActOnStartOfFunctionDef action later (not necessarily 2839/// immediately!) for this method, if it was also defined inside the 2840/// class body. 2841void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2842 if (!MethodD) 2843 return; 2844 2845 AdjustDeclIfTemplate(MethodD); 2846 2847 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2848 2849 // Now that we have our default arguments, check the constructor 2850 // again. It could produce additional diagnostics or affect whether 2851 // the class has implicitly-declared destructors, among other 2852 // things. 2853 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2854 CheckConstructor(Constructor); 2855 2856 // Check the default arguments, which we may have added. 2857 if (!Method->isInvalidDecl()) 2858 CheckCXXDefaultArguments(Method); 2859} 2860 2861/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2862/// the well-formedness of the constructor declarator @p D with type @p 2863/// R. If there are any errors in the declarator, this routine will 2864/// emit diagnostics and set the invalid bit to true. In any case, the type 2865/// will be updated to reflect a well-formed type for the constructor and 2866/// returned. 2867QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2868 FunctionDecl::StorageClass &SC) { 2869 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2870 2871 // C++ [class.ctor]p3: 2872 // A constructor shall not be virtual (10.3) or static (9.4). A 2873 // constructor can be invoked for a const, volatile or const 2874 // volatile object. A constructor shall not be declared const, 2875 // volatile, or const volatile (9.3.2). 2876 if (isVirtual) { 2877 if (!D.isInvalidType()) 2878 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2879 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2880 << SourceRange(D.getIdentifierLoc()); 2881 D.setInvalidType(); 2882 } 2883 if (SC == FunctionDecl::Static) { 2884 if (!D.isInvalidType()) 2885 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2886 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2887 << SourceRange(D.getIdentifierLoc()); 2888 D.setInvalidType(); 2889 SC = FunctionDecl::None; 2890 } 2891 2892 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2893 if (FTI.TypeQuals != 0) { 2894 if (FTI.TypeQuals & Qualifiers::Const) 2895 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2896 << "const" << SourceRange(D.getIdentifierLoc()); 2897 if (FTI.TypeQuals & Qualifiers::Volatile) 2898 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2899 << "volatile" << SourceRange(D.getIdentifierLoc()); 2900 if (FTI.TypeQuals & Qualifiers::Restrict) 2901 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2902 << "restrict" << SourceRange(D.getIdentifierLoc()); 2903 } 2904 2905 // Rebuild the function type "R" without any type qualifiers (in 2906 // case any of the errors above fired) and with "void" as the 2907 // return type, since constructors don't have return types. We 2908 // *always* have to do this, because GetTypeForDeclarator will 2909 // put in a result type of "int" when none was specified. 2910 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2911 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2912 Proto->getNumArgs(), 2913 Proto->isVariadic(), 0, 2914 Proto->hasExceptionSpec(), 2915 Proto->hasAnyExceptionSpec(), 2916 Proto->getNumExceptions(), 2917 Proto->exception_begin(), 2918 Proto->getExtInfo()); 2919} 2920 2921/// CheckConstructor - Checks a fully-formed constructor for 2922/// well-formedness, issuing any diagnostics required. Returns true if 2923/// the constructor declarator is invalid. 2924void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2925 CXXRecordDecl *ClassDecl 2926 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2927 if (!ClassDecl) 2928 return Constructor->setInvalidDecl(); 2929 2930 // C++ [class.copy]p3: 2931 // A declaration of a constructor for a class X is ill-formed if 2932 // its first parameter is of type (optionally cv-qualified) X and 2933 // either there are no other parameters or else all other 2934 // parameters have default arguments. 2935 if (!Constructor->isInvalidDecl() && 2936 ((Constructor->getNumParams() == 1) || 2937 (Constructor->getNumParams() > 1 && 2938 Constructor->getParamDecl(1)->hasDefaultArg())) && 2939 Constructor->getTemplateSpecializationKind() 2940 != TSK_ImplicitInstantiation) { 2941 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2942 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2943 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2944 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2945 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2946 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2947 2948 // FIXME: Rather that making the constructor invalid, we should endeavor 2949 // to fix the type. 2950 Constructor->setInvalidDecl(); 2951 } 2952 } 2953 2954 // Notify the class that we've added a constructor. In principle we 2955 // don't need to do this for out-of-line declarations; in practice 2956 // we only instantiate the most recent declaration of a method, so 2957 // we have to call this for everything but friends. 2958 if (!Constructor->getFriendObjectKind()) 2959 ClassDecl->addedConstructor(Context, Constructor); 2960} 2961 2962/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2963/// issuing any diagnostics required. Returns true on error. 2964bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2965 CXXRecordDecl *RD = Destructor->getParent(); 2966 2967 if (Destructor->isVirtual()) { 2968 SourceLocation Loc; 2969 2970 if (!Destructor->isImplicit()) 2971 Loc = Destructor->getLocation(); 2972 else 2973 Loc = RD->getLocation(); 2974 2975 // If we have a virtual destructor, look up the deallocation function 2976 FunctionDecl *OperatorDelete = 0; 2977 DeclarationName Name = 2978 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2979 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2980 return true; 2981 2982 Destructor->setOperatorDelete(OperatorDelete); 2983 } 2984 2985 return false; 2986} 2987 2988static inline bool 2989FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2990 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2991 FTI.ArgInfo[0].Param && 2992 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2993} 2994 2995/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2996/// the well-formednes of the destructor declarator @p D with type @p 2997/// R. If there are any errors in the declarator, this routine will 2998/// emit diagnostics and set the declarator to invalid. Even if this happens, 2999/// will be updated to reflect a well-formed type for the destructor and 3000/// returned. 3001QualType Sema::CheckDestructorDeclarator(Declarator &D, 3002 FunctionDecl::StorageClass& SC) { 3003 // C++ [class.dtor]p1: 3004 // [...] A typedef-name that names a class is a class-name 3005 // (7.1.3); however, a typedef-name that names a class shall not 3006 // be used as the identifier in the declarator for a destructor 3007 // declaration. 3008 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3009 if (isa<TypedefType>(DeclaratorType)) { 3010 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3011 << DeclaratorType; 3012 D.setInvalidType(); 3013 } 3014 3015 // C++ [class.dtor]p2: 3016 // A destructor is used to destroy objects of its class type. A 3017 // destructor takes no parameters, and no return type can be 3018 // specified for it (not even void). The address of a destructor 3019 // shall not be taken. A destructor shall not be static. A 3020 // destructor can be invoked for a const, volatile or const 3021 // volatile object. A destructor shall not be declared const, 3022 // volatile or const volatile (9.3.2). 3023 if (SC == FunctionDecl::Static) { 3024 if (!D.isInvalidType()) 3025 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3026 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3027 << SourceRange(D.getIdentifierLoc()); 3028 SC = FunctionDecl::None; 3029 D.setInvalidType(); 3030 } 3031 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3032 // Destructors don't have return types, but the parser will 3033 // happily parse something like: 3034 // 3035 // class X { 3036 // float ~X(); 3037 // }; 3038 // 3039 // The return type will be eliminated later. 3040 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3041 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3042 << SourceRange(D.getIdentifierLoc()); 3043 } 3044 3045 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3046 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3047 if (FTI.TypeQuals & Qualifiers::Const) 3048 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3049 << "const" << SourceRange(D.getIdentifierLoc()); 3050 if (FTI.TypeQuals & Qualifiers::Volatile) 3051 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3052 << "volatile" << SourceRange(D.getIdentifierLoc()); 3053 if (FTI.TypeQuals & Qualifiers::Restrict) 3054 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3055 << "restrict" << SourceRange(D.getIdentifierLoc()); 3056 D.setInvalidType(); 3057 } 3058 3059 // Make sure we don't have any parameters. 3060 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3061 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3062 3063 // Delete the parameters. 3064 FTI.freeArgs(); 3065 D.setInvalidType(); 3066 } 3067 3068 // Make sure the destructor isn't variadic. 3069 if (FTI.isVariadic) { 3070 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3071 D.setInvalidType(); 3072 } 3073 3074 // Rebuild the function type "R" without any type qualifiers or 3075 // parameters (in case any of the errors above fired) and with 3076 // "void" as the return type, since destructors don't have return 3077 // types. We *always* have to do this, because GetTypeForDeclarator 3078 // will put in a result type of "int" when none was specified. 3079 // FIXME: Exceptions! 3080 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3081 false, false, 0, 0, FunctionType::ExtInfo()); 3082} 3083 3084/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3085/// well-formednes of the conversion function declarator @p D with 3086/// type @p R. If there are any errors in the declarator, this routine 3087/// will emit diagnostics and return true. Otherwise, it will return 3088/// false. Either way, the type @p R will be updated to reflect a 3089/// well-formed type for the conversion operator. 3090void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3091 FunctionDecl::StorageClass& SC) { 3092 // C++ [class.conv.fct]p1: 3093 // Neither parameter types nor return type can be specified. The 3094 // type of a conversion function (8.3.5) is "function taking no 3095 // parameter returning conversion-type-id." 3096 if (SC == FunctionDecl::Static) { 3097 if (!D.isInvalidType()) 3098 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3099 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3100 << SourceRange(D.getIdentifierLoc()); 3101 D.setInvalidType(); 3102 SC = FunctionDecl::None; 3103 } 3104 3105 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3106 3107 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3108 // Conversion functions don't have return types, but the parser will 3109 // happily parse something like: 3110 // 3111 // class X { 3112 // float operator bool(); 3113 // }; 3114 // 3115 // The return type will be changed later anyway. 3116 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3117 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3118 << SourceRange(D.getIdentifierLoc()); 3119 D.setInvalidType(); 3120 } 3121 3122 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3123 3124 // Make sure we don't have any parameters. 3125 if (Proto->getNumArgs() > 0) { 3126 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3127 3128 // Delete the parameters. 3129 D.getTypeObject(0).Fun.freeArgs(); 3130 D.setInvalidType(); 3131 } else if (Proto->isVariadic()) { 3132 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3133 D.setInvalidType(); 3134 } 3135 3136 // Diagnose "&operator bool()" and other such nonsense. This 3137 // is actually a gcc extension which we don't support. 3138 if (Proto->getResultType() != ConvType) { 3139 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3140 << Proto->getResultType(); 3141 D.setInvalidType(); 3142 ConvType = Proto->getResultType(); 3143 } 3144 3145 // C++ [class.conv.fct]p4: 3146 // The conversion-type-id shall not represent a function type nor 3147 // an array type. 3148 if (ConvType->isArrayType()) { 3149 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3150 ConvType = Context.getPointerType(ConvType); 3151 D.setInvalidType(); 3152 } else if (ConvType->isFunctionType()) { 3153 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3154 ConvType = Context.getPointerType(ConvType); 3155 D.setInvalidType(); 3156 } 3157 3158 // Rebuild the function type "R" without any parameters (in case any 3159 // of the errors above fired) and with the conversion type as the 3160 // return type. 3161 if (D.isInvalidType()) { 3162 R = Context.getFunctionType(ConvType, 0, 0, false, 3163 Proto->getTypeQuals(), 3164 Proto->hasExceptionSpec(), 3165 Proto->hasAnyExceptionSpec(), 3166 Proto->getNumExceptions(), 3167 Proto->exception_begin(), 3168 Proto->getExtInfo()); 3169 } 3170 3171 // C++0x explicit conversion operators. 3172 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3173 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3174 diag::warn_explicit_conversion_functions) 3175 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3176} 3177 3178/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3179/// the declaration of the given C++ conversion function. This routine 3180/// is responsible for recording the conversion function in the C++ 3181/// class, if possible. 3182Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3183 assert(Conversion && "Expected to receive a conversion function declaration"); 3184 3185 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3186 3187 // Make sure we aren't redeclaring the conversion function. 3188 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3189 3190 // C++ [class.conv.fct]p1: 3191 // [...] A conversion function is never used to convert a 3192 // (possibly cv-qualified) object to the (possibly cv-qualified) 3193 // same object type (or a reference to it), to a (possibly 3194 // cv-qualified) base class of that type (or a reference to it), 3195 // or to (possibly cv-qualified) void. 3196 // FIXME: Suppress this warning if the conversion function ends up being a 3197 // virtual function that overrides a virtual function in a base class. 3198 QualType ClassType 3199 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3200 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3201 ConvType = ConvTypeRef->getPointeeType(); 3202 if (ConvType->isRecordType()) { 3203 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3204 if (ConvType == ClassType) 3205 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3206 << ClassType; 3207 else if (IsDerivedFrom(ClassType, ConvType)) 3208 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3209 << ClassType << ConvType; 3210 } else if (ConvType->isVoidType()) { 3211 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3212 << ClassType << ConvType; 3213 } 3214 3215 if (Conversion->getPrimaryTemplate()) { 3216 // ignore specializations 3217 } else if (Conversion->getPreviousDeclaration()) { 3218 if (FunctionTemplateDecl *ConversionTemplate 3219 = Conversion->getDescribedFunctionTemplate()) { 3220 if (ClassDecl->replaceConversion( 3221 ConversionTemplate->getPreviousDeclaration(), 3222 ConversionTemplate)) 3223 return DeclPtrTy::make(ConversionTemplate); 3224 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3225 Conversion)) 3226 return DeclPtrTy::make(Conversion); 3227 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3228 } else if (FunctionTemplateDecl *ConversionTemplate 3229 = Conversion->getDescribedFunctionTemplate()) 3230 ClassDecl->addConversionFunction(ConversionTemplate); 3231 else 3232 ClassDecl->addConversionFunction(Conversion); 3233 3234 return DeclPtrTy::make(Conversion); 3235} 3236 3237//===----------------------------------------------------------------------===// 3238// Namespace Handling 3239//===----------------------------------------------------------------------===// 3240 3241/// ActOnStartNamespaceDef - This is called at the start of a namespace 3242/// definition. 3243Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3244 SourceLocation IdentLoc, 3245 IdentifierInfo *II, 3246 SourceLocation LBrace, 3247 AttributeList *AttrList) { 3248 NamespaceDecl *Namespc = 3249 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3250 Namespc->setLBracLoc(LBrace); 3251 3252 Scope *DeclRegionScope = NamespcScope->getParent(); 3253 3254 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3255 3256 if (II) { 3257 // C++ [namespace.def]p2: 3258 // The identifier in an original-namespace-definition shall not have been 3259 // previously defined in the declarative region in which the 3260 // original-namespace-definition appears. The identifier in an 3261 // original-namespace-definition is the name of the namespace. Subsequently 3262 // in that declarative region, it is treated as an original-namespace-name. 3263 3264 NamedDecl *PrevDecl 3265 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3266 ForRedeclaration); 3267 3268 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3269 // This is an extended namespace definition. 3270 // Attach this namespace decl to the chain of extended namespace 3271 // definitions. 3272 OrigNS->setNextNamespace(Namespc); 3273 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3274 3275 // Remove the previous declaration from the scope. 3276 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3277 IdResolver.RemoveDecl(OrigNS); 3278 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3279 } 3280 } else if (PrevDecl) { 3281 // This is an invalid name redefinition. 3282 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3283 << Namespc->getDeclName(); 3284 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3285 Namespc->setInvalidDecl(); 3286 // Continue on to push Namespc as current DeclContext and return it. 3287 } else if (II->isStr("std") && 3288 CurContext->getLookupContext()->isTranslationUnit()) { 3289 // This is the first "real" definition of the namespace "std", so update 3290 // our cache of the "std" namespace to point at this definition. 3291 if (StdNamespace) { 3292 // We had already defined a dummy namespace "std". Link this new 3293 // namespace definition to the dummy namespace "std". 3294 StdNamespace->setNextNamespace(Namespc); 3295 StdNamespace->setLocation(IdentLoc); 3296 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3297 } 3298 3299 // Make our StdNamespace cache point at the first real definition of the 3300 // "std" namespace. 3301 StdNamespace = Namespc; 3302 } 3303 3304 PushOnScopeChains(Namespc, DeclRegionScope); 3305 } else { 3306 // Anonymous namespaces. 3307 assert(Namespc->isAnonymousNamespace()); 3308 3309 // Link the anonymous namespace into its parent. 3310 NamespaceDecl *PrevDecl; 3311 DeclContext *Parent = CurContext->getLookupContext(); 3312 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3313 PrevDecl = TU->getAnonymousNamespace(); 3314 TU->setAnonymousNamespace(Namespc); 3315 } else { 3316 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3317 PrevDecl = ND->getAnonymousNamespace(); 3318 ND->setAnonymousNamespace(Namespc); 3319 } 3320 3321 // Link the anonymous namespace with its previous declaration. 3322 if (PrevDecl) { 3323 assert(PrevDecl->isAnonymousNamespace()); 3324 assert(!PrevDecl->getNextNamespace()); 3325 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3326 PrevDecl->setNextNamespace(Namespc); 3327 } 3328 3329 CurContext->addDecl(Namespc); 3330 3331 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3332 // behaves as if it were replaced by 3333 // namespace unique { /* empty body */ } 3334 // using namespace unique; 3335 // namespace unique { namespace-body } 3336 // where all occurrences of 'unique' in a translation unit are 3337 // replaced by the same identifier and this identifier differs 3338 // from all other identifiers in the entire program. 3339 3340 // We just create the namespace with an empty name and then add an 3341 // implicit using declaration, just like the standard suggests. 3342 // 3343 // CodeGen enforces the "universally unique" aspect by giving all 3344 // declarations semantically contained within an anonymous 3345 // namespace internal linkage. 3346 3347 if (!PrevDecl) { 3348 UsingDirectiveDecl* UD 3349 = UsingDirectiveDecl::Create(Context, CurContext, 3350 /* 'using' */ LBrace, 3351 /* 'namespace' */ SourceLocation(), 3352 /* qualifier */ SourceRange(), 3353 /* NNS */ NULL, 3354 /* identifier */ SourceLocation(), 3355 Namespc, 3356 /* Ancestor */ CurContext); 3357 UD->setImplicit(); 3358 CurContext->addDecl(UD); 3359 } 3360 } 3361 3362 // Although we could have an invalid decl (i.e. the namespace name is a 3363 // redefinition), push it as current DeclContext and try to continue parsing. 3364 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3365 // for the namespace has the declarations that showed up in that particular 3366 // namespace definition. 3367 PushDeclContext(NamespcScope, Namespc); 3368 return DeclPtrTy::make(Namespc); 3369} 3370 3371/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3372/// is a namespace alias, returns the namespace it points to. 3373static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3374 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3375 return AD->getNamespace(); 3376 return dyn_cast_or_null<NamespaceDecl>(D); 3377} 3378 3379/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3380/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3381void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3382 Decl *Dcl = D.getAs<Decl>(); 3383 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3384 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3385 Namespc->setRBracLoc(RBrace); 3386 PopDeclContext(); 3387} 3388 3389Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3390 SourceLocation UsingLoc, 3391 SourceLocation NamespcLoc, 3392 CXXScopeSpec &SS, 3393 SourceLocation IdentLoc, 3394 IdentifierInfo *NamespcName, 3395 AttributeList *AttrList) { 3396 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3397 assert(NamespcName && "Invalid NamespcName."); 3398 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3399 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3400 3401 UsingDirectiveDecl *UDir = 0; 3402 3403 // Lookup namespace name. 3404 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3405 LookupParsedName(R, S, &SS); 3406 if (R.isAmbiguous()) 3407 return DeclPtrTy(); 3408 3409 if (!R.empty()) { 3410 NamedDecl *Named = R.getFoundDecl(); 3411 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3412 && "expected namespace decl"); 3413 // C++ [namespace.udir]p1: 3414 // A using-directive specifies that the names in the nominated 3415 // namespace can be used in the scope in which the 3416 // using-directive appears after the using-directive. During 3417 // unqualified name lookup (3.4.1), the names appear as if they 3418 // were declared in the nearest enclosing namespace which 3419 // contains both the using-directive and the nominated 3420 // namespace. [Note: in this context, "contains" means "contains 3421 // directly or indirectly". ] 3422 3423 // Find enclosing context containing both using-directive and 3424 // nominated namespace. 3425 NamespaceDecl *NS = getNamespaceDecl(Named); 3426 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3427 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3428 CommonAncestor = CommonAncestor->getParent(); 3429 3430 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3431 SS.getRange(), 3432 (NestedNameSpecifier *)SS.getScopeRep(), 3433 IdentLoc, Named, CommonAncestor); 3434 PushUsingDirective(S, UDir); 3435 } else { 3436 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3437 } 3438 3439 // FIXME: We ignore attributes for now. 3440 delete AttrList; 3441 return DeclPtrTy::make(UDir); 3442} 3443 3444void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3445 // If scope has associated entity, then using directive is at namespace 3446 // or translation unit scope. We add UsingDirectiveDecls, into 3447 // it's lookup structure. 3448 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3449 Ctx->addDecl(UDir); 3450 else 3451 // Otherwise it is block-sope. using-directives will affect lookup 3452 // only to the end of scope. 3453 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3454} 3455 3456 3457Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3458 AccessSpecifier AS, 3459 bool HasUsingKeyword, 3460 SourceLocation UsingLoc, 3461 CXXScopeSpec &SS, 3462 UnqualifiedId &Name, 3463 AttributeList *AttrList, 3464 bool IsTypeName, 3465 SourceLocation TypenameLoc) { 3466 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3467 3468 switch (Name.getKind()) { 3469 case UnqualifiedId::IK_Identifier: 3470 case UnqualifiedId::IK_OperatorFunctionId: 3471 case UnqualifiedId::IK_LiteralOperatorId: 3472 case UnqualifiedId::IK_ConversionFunctionId: 3473 break; 3474 3475 case UnqualifiedId::IK_ConstructorName: 3476 case UnqualifiedId::IK_ConstructorTemplateId: 3477 // C++0x inherited constructors. 3478 if (getLangOptions().CPlusPlus0x) break; 3479 3480 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3481 << SS.getRange(); 3482 return DeclPtrTy(); 3483 3484 case UnqualifiedId::IK_DestructorName: 3485 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3486 << SS.getRange(); 3487 return DeclPtrTy(); 3488 3489 case UnqualifiedId::IK_TemplateId: 3490 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3491 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3492 return DeclPtrTy(); 3493 } 3494 3495 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3496 if (!TargetName) 3497 return DeclPtrTy(); 3498 3499 // Warn about using declarations. 3500 // TODO: store that the declaration was written without 'using' and 3501 // talk about access decls instead of using decls in the 3502 // diagnostics. 3503 if (!HasUsingKeyword) { 3504 UsingLoc = Name.getSourceRange().getBegin(); 3505 3506 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3507 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3508 } 3509 3510 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3511 Name.getSourceRange().getBegin(), 3512 TargetName, AttrList, 3513 /* IsInstantiation */ false, 3514 IsTypeName, TypenameLoc); 3515 if (UD) 3516 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3517 3518 return DeclPtrTy::make(UD); 3519} 3520 3521/// Determines whether to create a using shadow decl for a particular 3522/// decl, given the set of decls existing prior to this using lookup. 3523bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3524 const LookupResult &Previous) { 3525 // Diagnose finding a decl which is not from a base class of the 3526 // current class. We do this now because there are cases where this 3527 // function will silently decide not to build a shadow decl, which 3528 // will pre-empt further diagnostics. 3529 // 3530 // We don't need to do this in C++0x because we do the check once on 3531 // the qualifier. 3532 // 3533 // FIXME: diagnose the following if we care enough: 3534 // struct A { int foo; }; 3535 // struct B : A { using A::foo; }; 3536 // template <class T> struct C : A {}; 3537 // template <class T> struct D : C<T> { using B::foo; } // <--- 3538 // This is invalid (during instantiation) in C++03 because B::foo 3539 // resolves to the using decl in B, which is not a base class of D<T>. 3540 // We can't diagnose it immediately because C<T> is an unknown 3541 // specialization. The UsingShadowDecl in D<T> then points directly 3542 // to A::foo, which will look well-formed when we instantiate. 3543 // The right solution is to not collapse the shadow-decl chain. 3544 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3545 DeclContext *OrigDC = Orig->getDeclContext(); 3546 3547 // Handle enums and anonymous structs. 3548 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3549 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3550 while (OrigRec->isAnonymousStructOrUnion()) 3551 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3552 3553 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3554 if (OrigDC == CurContext) { 3555 Diag(Using->getLocation(), 3556 diag::err_using_decl_nested_name_specifier_is_current_class) 3557 << Using->getNestedNameRange(); 3558 Diag(Orig->getLocation(), diag::note_using_decl_target); 3559 return true; 3560 } 3561 3562 Diag(Using->getNestedNameRange().getBegin(), 3563 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3564 << Using->getTargetNestedNameDecl() 3565 << cast<CXXRecordDecl>(CurContext) 3566 << Using->getNestedNameRange(); 3567 Diag(Orig->getLocation(), diag::note_using_decl_target); 3568 return true; 3569 } 3570 } 3571 3572 if (Previous.empty()) return false; 3573 3574 NamedDecl *Target = Orig; 3575 if (isa<UsingShadowDecl>(Target)) 3576 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3577 3578 // If the target happens to be one of the previous declarations, we 3579 // don't have a conflict. 3580 // 3581 // FIXME: but we might be increasing its access, in which case we 3582 // should redeclare it. 3583 NamedDecl *NonTag = 0, *Tag = 0; 3584 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3585 I != E; ++I) { 3586 NamedDecl *D = (*I)->getUnderlyingDecl(); 3587 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3588 return false; 3589 3590 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3591 } 3592 3593 if (Target->isFunctionOrFunctionTemplate()) { 3594 FunctionDecl *FD; 3595 if (isa<FunctionTemplateDecl>(Target)) 3596 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3597 else 3598 FD = cast<FunctionDecl>(Target); 3599 3600 NamedDecl *OldDecl = 0; 3601 switch (CheckOverload(FD, Previous, OldDecl)) { 3602 case Ovl_Overload: 3603 return false; 3604 3605 case Ovl_NonFunction: 3606 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3607 break; 3608 3609 // We found a decl with the exact signature. 3610 case Ovl_Match: 3611 if (isa<UsingShadowDecl>(OldDecl)) { 3612 // Silently ignore the possible conflict. 3613 return false; 3614 } 3615 3616 // If we're in a record, we want to hide the target, so we 3617 // return true (without a diagnostic) to tell the caller not to 3618 // build a shadow decl. 3619 if (CurContext->isRecord()) 3620 return true; 3621 3622 // If we're not in a record, this is an error. 3623 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3624 break; 3625 } 3626 3627 Diag(Target->getLocation(), diag::note_using_decl_target); 3628 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3629 return true; 3630 } 3631 3632 // Target is not a function. 3633 3634 if (isa<TagDecl>(Target)) { 3635 // No conflict between a tag and a non-tag. 3636 if (!Tag) return false; 3637 3638 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3639 Diag(Target->getLocation(), diag::note_using_decl_target); 3640 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3641 return true; 3642 } 3643 3644 // No conflict between a tag and a non-tag. 3645 if (!NonTag) return false; 3646 3647 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3648 Diag(Target->getLocation(), diag::note_using_decl_target); 3649 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3650 return true; 3651} 3652 3653/// Builds a shadow declaration corresponding to a 'using' declaration. 3654UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3655 UsingDecl *UD, 3656 NamedDecl *Orig) { 3657 3658 // If we resolved to another shadow declaration, just coalesce them. 3659 NamedDecl *Target = Orig; 3660 if (isa<UsingShadowDecl>(Target)) { 3661 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3662 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3663 } 3664 3665 UsingShadowDecl *Shadow 3666 = UsingShadowDecl::Create(Context, CurContext, 3667 UD->getLocation(), UD, Target); 3668 UD->addShadowDecl(Shadow); 3669 3670 if (S) 3671 PushOnScopeChains(Shadow, S); 3672 else 3673 CurContext->addDecl(Shadow); 3674 Shadow->setAccess(UD->getAccess()); 3675 3676 // Register it as a conversion if appropriate. 3677 if (Shadow->getDeclName().getNameKind() 3678 == DeclarationName::CXXConversionFunctionName) 3679 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3680 3681 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3682 Shadow->setInvalidDecl(); 3683 3684 return Shadow; 3685} 3686 3687/// Hides a using shadow declaration. This is required by the current 3688/// using-decl implementation when a resolvable using declaration in a 3689/// class is followed by a declaration which would hide or override 3690/// one or more of the using decl's targets; for example: 3691/// 3692/// struct Base { void foo(int); }; 3693/// struct Derived : Base { 3694/// using Base::foo; 3695/// void foo(int); 3696/// }; 3697/// 3698/// The governing language is C++03 [namespace.udecl]p12: 3699/// 3700/// When a using-declaration brings names from a base class into a 3701/// derived class scope, member functions in the derived class 3702/// override and/or hide member functions with the same name and 3703/// parameter types in a base class (rather than conflicting). 3704/// 3705/// There are two ways to implement this: 3706/// (1) optimistically create shadow decls when they're not hidden 3707/// by existing declarations, or 3708/// (2) don't create any shadow decls (or at least don't make them 3709/// visible) until we've fully parsed/instantiated the class. 3710/// The problem with (1) is that we might have to retroactively remove 3711/// a shadow decl, which requires several O(n) operations because the 3712/// decl structures are (very reasonably) not designed for removal. 3713/// (2) avoids this but is very fiddly and phase-dependent. 3714void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3715 if (Shadow->getDeclName().getNameKind() == 3716 DeclarationName::CXXConversionFunctionName) 3717 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3718 3719 // Remove it from the DeclContext... 3720 Shadow->getDeclContext()->removeDecl(Shadow); 3721 3722 // ...and the scope, if applicable... 3723 if (S) { 3724 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3725 IdResolver.RemoveDecl(Shadow); 3726 } 3727 3728 // ...and the using decl. 3729 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3730 3731 // TODO: complain somehow if Shadow was used. It shouldn't 3732 // be possible for this to happen, because...? 3733} 3734 3735/// Builds a using declaration. 3736/// 3737/// \param IsInstantiation - Whether this call arises from an 3738/// instantiation of an unresolved using declaration. We treat 3739/// the lookup differently for these declarations. 3740NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3741 SourceLocation UsingLoc, 3742 CXXScopeSpec &SS, 3743 SourceLocation IdentLoc, 3744 DeclarationName Name, 3745 AttributeList *AttrList, 3746 bool IsInstantiation, 3747 bool IsTypeName, 3748 SourceLocation TypenameLoc) { 3749 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3750 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3751 3752 // FIXME: We ignore attributes for now. 3753 delete AttrList; 3754 3755 if (SS.isEmpty()) { 3756 Diag(IdentLoc, diag::err_using_requires_qualname); 3757 return 0; 3758 } 3759 3760 // Do the redeclaration lookup in the current scope. 3761 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3762 ForRedeclaration); 3763 Previous.setHideTags(false); 3764 if (S) { 3765 LookupName(Previous, S); 3766 3767 // It is really dumb that we have to do this. 3768 LookupResult::Filter F = Previous.makeFilter(); 3769 while (F.hasNext()) { 3770 NamedDecl *D = F.next(); 3771 if (!isDeclInScope(D, CurContext, S)) 3772 F.erase(); 3773 } 3774 F.done(); 3775 } else { 3776 assert(IsInstantiation && "no scope in non-instantiation"); 3777 assert(CurContext->isRecord() && "scope not record in instantiation"); 3778 LookupQualifiedName(Previous, CurContext); 3779 } 3780 3781 NestedNameSpecifier *NNS = 3782 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3783 3784 // Check for invalid redeclarations. 3785 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3786 return 0; 3787 3788 // Check for bad qualifiers. 3789 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3790 return 0; 3791 3792 DeclContext *LookupContext = computeDeclContext(SS); 3793 NamedDecl *D; 3794 if (!LookupContext) { 3795 if (IsTypeName) { 3796 // FIXME: not all declaration name kinds are legal here 3797 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3798 UsingLoc, TypenameLoc, 3799 SS.getRange(), NNS, 3800 IdentLoc, Name); 3801 } else { 3802 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3803 UsingLoc, SS.getRange(), NNS, 3804 IdentLoc, Name); 3805 } 3806 } else { 3807 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3808 SS.getRange(), UsingLoc, NNS, Name, 3809 IsTypeName); 3810 } 3811 D->setAccess(AS); 3812 CurContext->addDecl(D); 3813 3814 if (!LookupContext) return D; 3815 UsingDecl *UD = cast<UsingDecl>(D); 3816 3817 if (RequireCompleteDeclContext(SS, LookupContext)) { 3818 UD->setInvalidDecl(); 3819 return UD; 3820 } 3821 3822 // Look up the target name. 3823 3824 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3825 3826 // Unlike most lookups, we don't always want to hide tag 3827 // declarations: tag names are visible through the using declaration 3828 // even if hidden by ordinary names, *except* in a dependent context 3829 // where it's important for the sanity of two-phase lookup. 3830 if (!IsInstantiation) 3831 R.setHideTags(false); 3832 3833 LookupQualifiedName(R, LookupContext); 3834 3835 if (R.empty()) { 3836 Diag(IdentLoc, diag::err_no_member) 3837 << Name << LookupContext << SS.getRange(); 3838 UD->setInvalidDecl(); 3839 return UD; 3840 } 3841 3842 if (R.isAmbiguous()) { 3843 UD->setInvalidDecl(); 3844 return UD; 3845 } 3846 3847 if (IsTypeName) { 3848 // If we asked for a typename and got a non-type decl, error out. 3849 if (!R.getAsSingle<TypeDecl>()) { 3850 Diag(IdentLoc, diag::err_using_typename_non_type); 3851 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3852 Diag((*I)->getUnderlyingDecl()->getLocation(), 3853 diag::note_using_decl_target); 3854 UD->setInvalidDecl(); 3855 return UD; 3856 } 3857 } else { 3858 // If we asked for a non-typename and we got a type, error out, 3859 // but only if this is an instantiation of an unresolved using 3860 // decl. Otherwise just silently find the type name. 3861 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3862 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3863 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3864 UD->setInvalidDecl(); 3865 return UD; 3866 } 3867 } 3868 3869 // C++0x N2914 [namespace.udecl]p6: 3870 // A using-declaration shall not name a namespace. 3871 if (R.getAsSingle<NamespaceDecl>()) { 3872 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3873 << SS.getRange(); 3874 UD->setInvalidDecl(); 3875 return UD; 3876 } 3877 3878 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3879 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3880 BuildUsingShadowDecl(S, UD, *I); 3881 } 3882 3883 return UD; 3884} 3885 3886/// Checks that the given using declaration is not an invalid 3887/// redeclaration. Note that this is checking only for the using decl 3888/// itself, not for any ill-formedness among the UsingShadowDecls. 3889bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3890 bool isTypeName, 3891 const CXXScopeSpec &SS, 3892 SourceLocation NameLoc, 3893 const LookupResult &Prev) { 3894 // C++03 [namespace.udecl]p8: 3895 // C++0x [namespace.udecl]p10: 3896 // A using-declaration is a declaration and can therefore be used 3897 // repeatedly where (and only where) multiple declarations are 3898 // allowed. 3899 // 3900 // That's in non-member contexts. 3901 if (!CurContext->getLookupContext()->isRecord()) 3902 return false; 3903 3904 NestedNameSpecifier *Qual 3905 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3906 3907 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3908 NamedDecl *D = *I; 3909 3910 bool DTypename; 3911 NestedNameSpecifier *DQual; 3912 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3913 DTypename = UD->isTypeName(); 3914 DQual = UD->getTargetNestedNameDecl(); 3915 } else if (UnresolvedUsingValueDecl *UD 3916 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3917 DTypename = false; 3918 DQual = UD->getTargetNestedNameSpecifier(); 3919 } else if (UnresolvedUsingTypenameDecl *UD 3920 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3921 DTypename = true; 3922 DQual = UD->getTargetNestedNameSpecifier(); 3923 } else continue; 3924 3925 // using decls differ if one says 'typename' and the other doesn't. 3926 // FIXME: non-dependent using decls? 3927 if (isTypeName != DTypename) continue; 3928 3929 // using decls differ if they name different scopes (but note that 3930 // template instantiation can cause this check to trigger when it 3931 // didn't before instantiation). 3932 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3933 Context.getCanonicalNestedNameSpecifier(DQual)) 3934 continue; 3935 3936 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3937 Diag(D->getLocation(), diag::note_using_decl) << 1; 3938 return true; 3939 } 3940 3941 return false; 3942} 3943 3944 3945/// Checks that the given nested-name qualifier used in a using decl 3946/// in the current context is appropriately related to the current 3947/// scope. If an error is found, diagnoses it and returns true. 3948bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3949 const CXXScopeSpec &SS, 3950 SourceLocation NameLoc) { 3951 DeclContext *NamedContext = computeDeclContext(SS); 3952 3953 if (!CurContext->isRecord()) { 3954 // C++03 [namespace.udecl]p3: 3955 // C++0x [namespace.udecl]p8: 3956 // A using-declaration for a class member shall be a member-declaration. 3957 3958 // If we weren't able to compute a valid scope, it must be a 3959 // dependent class scope. 3960 if (!NamedContext || NamedContext->isRecord()) { 3961 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3962 << SS.getRange(); 3963 return true; 3964 } 3965 3966 // Otherwise, everything is known to be fine. 3967 return false; 3968 } 3969 3970 // The current scope is a record. 3971 3972 // If the named context is dependent, we can't decide much. 3973 if (!NamedContext) { 3974 // FIXME: in C++0x, we can diagnose if we can prove that the 3975 // nested-name-specifier does not refer to a base class, which is 3976 // still possible in some cases. 3977 3978 // Otherwise we have to conservatively report that things might be 3979 // okay. 3980 return false; 3981 } 3982 3983 if (!NamedContext->isRecord()) { 3984 // Ideally this would point at the last name in the specifier, 3985 // but we don't have that level of source info. 3986 Diag(SS.getRange().getBegin(), 3987 diag::err_using_decl_nested_name_specifier_is_not_class) 3988 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3989 return true; 3990 } 3991 3992 if (getLangOptions().CPlusPlus0x) { 3993 // C++0x [namespace.udecl]p3: 3994 // In a using-declaration used as a member-declaration, the 3995 // nested-name-specifier shall name a base class of the class 3996 // being defined. 3997 3998 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3999 cast<CXXRecordDecl>(NamedContext))) { 4000 if (CurContext == NamedContext) { 4001 Diag(NameLoc, 4002 diag::err_using_decl_nested_name_specifier_is_current_class) 4003 << SS.getRange(); 4004 return true; 4005 } 4006 4007 Diag(SS.getRange().getBegin(), 4008 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4009 << (NestedNameSpecifier*) SS.getScopeRep() 4010 << cast<CXXRecordDecl>(CurContext) 4011 << SS.getRange(); 4012 return true; 4013 } 4014 4015 return false; 4016 } 4017 4018 // C++03 [namespace.udecl]p4: 4019 // A using-declaration used as a member-declaration shall refer 4020 // to a member of a base class of the class being defined [etc.]. 4021 4022 // Salient point: SS doesn't have to name a base class as long as 4023 // lookup only finds members from base classes. Therefore we can 4024 // diagnose here only if we can prove that that can't happen, 4025 // i.e. if the class hierarchies provably don't intersect. 4026 4027 // TODO: it would be nice if "definitely valid" results were cached 4028 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4029 // need to be repeated. 4030 4031 struct UserData { 4032 llvm::DenseSet<const CXXRecordDecl*> Bases; 4033 4034 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4035 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4036 Data->Bases.insert(Base); 4037 return true; 4038 } 4039 4040 bool hasDependentBases(const CXXRecordDecl *Class) { 4041 return !Class->forallBases(collect, this); 4042 } 4043 4044 /// Returns true if the base is dependent or is one of the 4045 /// accumulated base classes. 4046 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4047 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4048 return !Data->Bases.count(Base); 4049 } 4050 4051 bool mightShareBases(const CXXRecordDecl *Class) { 4052 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4053 } 4054 }; 4055 4056 UserData Data; 4057 4058 // Returns false if we find a dependent base. 4059 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4060 return false; 4061 4062 // Returns false if the class has a dependent base or if it or one 4063 // of its bases is present in the base set of the current context. 4064 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4065 return false; 4066 4067 Diag(SS.getRange().getBegin(), 4068 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4069 << (NestedNameSpecifier*) SS.getScopeRep() 4070 << cast<CXXRecordDecl>(CurContext) 4071 << SS.getRange(); 4072 4073 return true; 4074} 4075 4076Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4077 SourceLocation NamespaceLoc, 4078 SourceLocation AliasLoc, 4079 IdentifierInfo *Alias, 4080 CXXScopeSpec &SS, 4081 SourceLocation IdentLoc, 4082 IdentifierInfo *Ident) { 4083 4084 // Lookup the namespace name. 4085 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4086 LookupParsedName(R, S, &SS); 4087 4088 // Check if we have a previous declaration with the same name. 4089 NamedDecl *PrevDecl 4090 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4091 ForRedeclaration); 4092 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4093 PrevDecl = 0; 4094 4095 if (PrevDecl) { 4096 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4097 // We already have an alias with the same name that points to the same 4098 // namespace, so don't create a new one. 4099 // FIXME: At some point, we'll want to create the (redundant) 4100 // declaration to maintain better source information. 4101 if (!R.isAmbiguous() && !R.empty() && 4102 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4103 return DeclPtrTy(); 4104 } 4105 4106 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4107 diag::err_redefinition_different_kind; 4108 Diag(AliasLoc, DiagID) << Alias; 4109 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4110 return DeclPtrTy(); 4111 } 4112 4113 if (R.isAmbiguous()) 4114 return DeclPtrTy(); 4115 4116 if (R.empty()) { 4117 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4118 return DeclPtrTy(); 4119 } 4120 4121 NamespaceAliasDecl *AliasDecl = 4122 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4123 Alias, SS.getRange(), 4124 (NestedNameSpecifier *)SS.getScopeRep(), 4125 IdentLoc, R.getFoundDecl()); 4126 4127 PushOnScopeChains(AliasDecl, S); 4128 return DeclPtrTy::make(AliasDecl); 4129} 4130 4131namespace { 4132 /// \brief Scoped object used to handle the state changes required in Sema 4133 /// to implicitly define the body of a C++ member function; 4134 class ImplicitlyDefinedFunctionScope { 4135 Sema &S; 4136 DeclContext *PreviousContext; 4137 4138 public: 4139 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4140 : S(S), PreviousContext(S.CurContext) 4141 { 4142 S.CurContext = Method; 4143 S.PushFunctionScope(); 4144 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4145 } 4146 4147 ~ImplicitlyDefinedFunctionScope() { 4148 S.PopExpressionEvaluationContext(); 4149 S.PopFunctionOrBlockScope(); 4150 S.CurContext = PreviousContext; 4151 } 4152 }; 4153} 4154 4155void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4156 CXXConstructorDecl *Constructor) { 4157 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4158 !Constructor->isUsed()) && 4159 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4160 4161 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4162 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4163 4164 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4165 ErrorTrap Trap(*this); 4166 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4167 Trap.hasErrorOccurred()) { 4168 Diag(CurrentLocation, diag::note_member_synthesized_at) 4169 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4170 Constructor->setInvalidDecl(); 4171 } else { 4172 Constructor->setUsed(); 4173 MarkVTableUsed(CurrentLocation, ClassDecl); 4174 } 4175} 4176 4177void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4178 CXXDestructorDecl *Destructor) { 4179 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4180 "DefineImplicitDestructor - call it for implicit default dtor"); 4181 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4182 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4183 4184 if (Destructor->isInvalidDecl()) 4185 return; 4186 4187 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4188 4189 ErrorTrap Trap(*this); 4190 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4191 Destructor->getParent()); 4192 4193 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4194 Diag(CurrentLocation, diag::note_member_synthesized_at) 4195 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4196 4197 Destructor->setInvalidDecl(); 4198 return; 4199 } 4200 4201 Destructor->setUsed(); 4202 MarkVTableUsed(CurrentLocation, ClassDecl); 4203} 4204 4205/// \brief Builds a statement that copies the given entity from \p From to 4206/// \c To. 4207/// 4208/// This routine is used to copy the members of a class with an 4209/// implicitly-declared copy assignment operator. When the entities being 4210/// copied are arrays, this routine builds for loops to copy them. 4211/// 4212/// \param S The Sema object used for type-checking. 4213/// 4214/// \param Loc The location where the implicit copy is being generated. 4215/// 4216/// \param T The type of the expressions being copied. Both expressions must 4217/// have this type. 4218/// 4219/// \param To The expression we are copying to. 4220/// 4221/// \param From The expression we are copying from. 4222/// 4223/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4224/// Otherwise, it's a non-static member subobject. 4225/// 4226/// \param Depth Internal parameter recording the depth of the recursion. 4227/// 4228/// \returns A statement or a loop that copies the expressions. 4229static Sema::OwningStmtResult 4230BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4231 Sema::OwningExprResult To, Sema::OwningExprResult From, 4232 bool CopyingBaseSubobject, unsigned Depth = 0) { 4233 typedef Sema::OwningStmtResult OwningStmtResult; 4234 typedef Sema::OwningExprResult OwningExprResult; 4235 4236 // C++0x [class.copy]p30: 4237 // Each subobject is assigned in the manner appropriate to its type: 4238 // 4239 // - if the subobject is of class type, the copy assignment operator 4240 // for the class is used (as if by explicit qualification; that is, 4241 // ignoring any possible virtual overriding functions in more derived 4242 // classes); 4243 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4244 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4245 4246 // Look for operator=. 4247 DeclarationName Name 4248 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4249 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4250 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4251 4252 // Filter out any result that isn't a copy-assignment operator. 4253 LookupResult::Filter F = OpLookup.makeFilter(); 4254 while (F.hasNext()) { 4255 NamedDecl *D = F.next(); 4256 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4257 if (Method->isCopyAssignmentOperator()) 4258 continue; 4259 4260 F.erase(); 4261 } 4262 F.done(); 4263 4264 // Suppress the protected check (C++ [class.protected]) for each of the 4265 // assignment operators we found. This strange dance is required when 4266 // we're assigning via a base classes's copy-assignment operator. To 4267 // ensure that we're getting the right base class subobject (without 4268 // ambiguities), we need to cast "this" to that subobject type; to 4269 // ensure that we don't go through the virtual call mechanism, we need 4270 // to qualify the operator= name with the base class (see below). However, 4271 // this means that if the base class has a protected copy assignment 4272 // operator, the protected member access check will fail. So, we 4273 // rewrite "protected" access to "public" access in this case, since we 4274 // know by construction that we're calling from a derived class. 4275 if (CopyingBaseSubobject) { 4276 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4277 L != LEnd; ++L) { 4278 if (L.getAccess() == AS_protected) 4279 L.setAccess(AS_public); 4280 } 4281 } 4282 4283 // Create the nested-name-specifier that will be used to qualify the 4284 // reference to operator=; this is required to suppress the virtual 4285 // call mechanism. 4286 CXXScopeSpec SS; 4287 SS.setRange(Loc); 4288 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4289 T.getTypePtr())); 4290 4291 // Create the reference to operator=. 4292 OwningExprResult OpEqualRef 4293 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4294 /*FirstQualifierInScope=*/0, OpLookup, 4295 /*TemplateArgs=*/0, 4296 /*SuppressQualifierCheck=*/true); 4297 if (OpEqualRef.isInvalid()) 4298 return S.StmtError(); 4299 4300 // Build the call to the assignment operator. 4301 Expr *FromE = From.takeAs<Expr>(); 4302 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4303 OpEqualRef.takeAs<Expr>(), 4304 Loc, &FromE, 1, 0, Loc); 4305 if (Call.isInvalid()) 4306 return S.StmtError(); 4307 4308 return S.Owned(Call.takeAs<Stmt>()); 4309 } 4310 4311 // - if the subobject is of scalar type, the built-in assignment 4312 // operator is used. 4313 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4314 if (!ArrayTy) { 4315 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4316 BinaryOperator::Assign, 4317 To.takeAs<Expr>(), 4318 From.takeAs<Expr>()); 4319 if (Assignment.isInvalid()) 4320 return S.StmtError(); 4321 4322 return S.Owned(Assignment.takeAs<Stmt>()); 4323 } 4324 4325 // - if the subobject is an array, each element is assigned, in the 4326 // manner appropriate to the element type; 4327 4328 // Construct a loop over the array bounds, e.g., 4329 // 4330 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4331 // 4332 // that will copy each of the array elements. 4333 QualType SizeType = S.Context.getSizeType(); 4334 4335 // Create the iteration variable. 4336 IdentifierInfo *IterationVarName = 0; 4337 { 4338 llvm::SmallString<8> Str; 4339 llvm::raw_svector_ostream OS(Str); 4340 OS << "__i" << Depth; 4341 IterationVarName = &S.Context.Idents.get(OS.str()); 4342 } 4343 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4344 IterationVarName, SizeType, 4345 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4346 VarDecl::None, VarDecl::None); 4347 4348 // Initialize the iteration variable to zero. 4349 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4350 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4351 4352 // Create a reference to the iteration variable; we'll use this several 4353 // times throughout. 4354 Expr *IterationVarRef 4355 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4356 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4357 4358 // Create the DeclStmt that holds the iteration variable. 4359 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4360 4361 // Create the comparison against the array bound. 4362 llvm::APInt Upper = ArrayTy->getSize(); 4363 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4364 OwningExprResult Comparison 4365 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4366 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4367 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4368 4369 // Create the pre-increment of the iteration variable. 4370 OwningExprResult Increment 4371 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4372 UnaryOperator::PreInc, 4373 SizeType, Loc)); 4374 4375 // Subscript the "from" and "to" expressions with the iteration variable. 4376 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4377 S.Owned(IterationVarRef->Retain()), 4378 Loc); 4379 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4380 S.Owned(IterationVarRef->Retain()), 4381 Loc); 4382 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4383 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4384 4385 // Build the copy for an individual element of the array. 4386 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4387 ArrayTy->getElementType(), 4388 move(To), move(From), 4389 CopyingBaseSubobject, Depth+1); 4390 if (Copy.isInvalid()) { 4391 InitStmt->Destroy(S.Context); 4392 return S.StmtError(); 4393 } 4394 4395 // Construct the loop that copies all elements of this array. 4396 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4397 S.MakeFullExpr(Comparison), 4398 Sema::DeclPtrTy(), 4399 S.MakeFullExpr(Increment), 4400 Loc, move(Copy)); 4401} 4402 4403void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4404 CXXMethodDecl *CopyAssignOperator) { 4405 assert((CopyAssignOperator->isImplicit() && 4406 CopyAssignOperator->isOverloadedOperator() && 4407 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4408 !CopyAssignOperator->isUsed()) && 4409 "DefineImplicitCopyAssignment called for wrong function"); 4410 4411 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4412 4413 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4414 CopyAssignOperator->setInvalidDecl(); 4415 return; 4416 } 4417 4418 CopyAssignOperator->setUsed(); 4419 4420 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4421 ErrorTrap Trap(*this); 4422 4423 // C++0x [class.copy]p30: 4424 // The implicitly-defined or explicitly-defaulted copy assignment operator 4425 // for a non-union class X performs memberwise copy assignment of its 4426 // subobjects. The direct base classes of X are assigned first, in the 4427 // order of their declaration in the base-specifier-list, and then the 4428 // immediate non-static data members of X are assigned, in the order in 4429 // which they were declared in the class definition. 4430 4431 // The statements that form the synthesized function body. 4432 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4433 4434 // The parameter for the "other" object, which we are copying from. 4435 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4436 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4437 QualType OtherRefType = Other->getType(); 4438 if (const LValueReferenceType *OtherRef 4439 = OtherRefType->getAs<LValueReferenceType>()) { 4440 OtherRefType = OtherRef->getPointeeType(); 4441 OtherQuals = OtherRefType.getQualifiers(); 4442 } 4443 4444 // Our location for everything implicitly-generated. 4445 SourceLocation Loc = CopyAssignOperator->getLocation(); 4446 4447 // Construct a reference to the "other" object. We'll be using this 4448 // throughout the generated ASTs. 4449 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4450 assert(OtherRef && "Reference to parameter cannot fail!"); 4451 4452 // Construct the "this" pointer. We'll be using this throughout the generated 4453 // ASTs. 4454 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4455 assert(This && "Reference to this cannot fail!"); 4456 4457 // Assign base classes. 4458 bool Invalid = false; 4459 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4460 E = ClassDecl->bases_end(); Base != E; ++Base) { 4461 // Form the assignment: 4462 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4463 QualType BaseType = Base->getType().getUnqualifiedType(); 4464 CXXRecordDecl *BaseClassDecl = 0; 4465 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4466 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4467 else { 4468 Invalid = true; 4469 continue; 4470 } 4471 4472 // Construct the "from" expression, which is an implicit cast to the 4473 // appropriately-qualified base type. 4474 Expr *From = OtherRef->Retain(); 4475 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4476 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4477 CXXBaseSpecifierArray(Base)); 4478 4479 // Dereference "this". 4480 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4481 Owned(This->Retain())); 4482 4483 // Implicitly cast "this" to the appropriately-qualified base type. 4484 Expr *ToE = To.takeAs<Expr>(); 4485 ImpCastExprToType(ToE, 4486 Context.getCVRQualifiedType(BaseType, 4487 CopyAssignOperator->getTypeQualifiers()), 4488 CastExpr::CK_UncheckedDerivedToBase, 4489 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4490 To = Owned(ToE); 4491 4492 // Build the copy. 4493 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4494 move(To), Owned(From), 4495 /*CopyingBaseSubobject=*/true); 4496 if (Copy.isInvalid()) { 4497 Diag(CurrentLocation, diag::note_member_synthesized_at) 4498 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4499 CopyAssignOperator->setInvalidDecl(); 4500 return; 4501 } 4502 4503 // Success! Record the copy. 4504 Statements.push_back(Copy.takeAs<Expr>()); 4505 } 4506 4507 // \brief Reference to the __builtin_memcpy function. 4508 Expr *BuiltinMemCpyRef = 0; 4509 4510 // Assign non-static members. 4511 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4512 FieldEnd = ClassDecl->field_end(); 4513 Field != FieldEnd; ++Field) { 4514 // Check for members of reference type; we can't copy those. 4515 if (Field->getType()->isReferenceType()) { 4516 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4517 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4518 Diag(Field->getLocation(), diag::note_declared_at); 4519 Diag(CurrentLocation, diag::note_member_synthesized_at) 4520 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4521 Invalid = true; 4522 continue; 4523 } 4524 4525 // Check for members of const-qualified, non-class type. 4526 QualType BaseType = Context.getBaseElementType(Field->getType()); 4527 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4528 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4529 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4530 Diag(Field->getLocation(), diag::note_declared_at); 4531 Diag(CurrentLocation, diag::note_member_synthesized_at) 4532 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4533 Invalid = true; 4534 continue; 4535 } 4536 4537 QualType FieldType = Field->getType().getNonReferenceType(); 4538 4539 // Build references to the field in the object we're copying from and to. 4540 CXXScopeSpec SS; // Intentionally empty 4541 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4542 LookupMemberName); 4543 MemberLookup.addDecl(*Field); 4544 MemberLookup.resolveKind(); 4545 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4546 OtherRefType, 4547 Loc, /*IsArrow=*/false, 4548 SS, 0, MemberLookup, 0); 4549 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4550 This->getType(), 4551 Loc, /*IsArrow=*/true, 4552 SS, 0, MemberLookup, 0); 4553 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4554 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4555 4556 // If the field should be copied with __builtin_memcpy rather than via 4557 // explicit assignments, do so. This optimization only applies for arrays 4558 // of scalars and arrays of class type with trivial copy-assignment 4559 // operators. 4560 if (FieldType->isArrayType() && 4561 (!BaseType->isRecordType() || 4562 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4563 ->hasTrivialCopyAssignment())) { 4564 // Compute the size of the memory buffer to be copied. 4565 QualType SizeType = Context.getSizeType(); 4566 llvm::APInt Size(Context.getTypeSize(SizeType), 4567 Context.getTypeSizeInChars(BaseType).getQuantity()); 4568 for (const ConstantArrayType *Array 4569 = Context.getAsConstantArrayType(FieldType); 4570 Array; 4571 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4572 llvm::APInt ArraySize = Array->getSize(); 4573 ArraySize.zextOrTrunc(Size.getBitWidth()); 4574 Size *= ArraySize; 4575 } 4576 4577 // Take the address of the field references for "from" and "to". 4578 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4579 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4580 4581 // Create a reference to the __builtin_memcpy builtin function. 4582 if (!BuiltinMemCpyRef) { 4583 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4584 LookupOrdinaryName); 4585 LookupName(R, TUScope, true); 4586 4587 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4588 if (!BuiltinMemCpy) { 4589 // Something went horribly wrong earlier, and we will have complained 4590 // about it. 4591 Invalid = true; 4592 continue; 4593 } 4594 4595 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4596 BuiltinMemCpy->getType(), 4597 Loc, 0).takeAs<Expr>(); 4598 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4599 } 4600 4601 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4602 CallArgs.push_back(To.takeAs<Expr>()); 4603 CallArgs.push_back(From.takeAs<Expr>()); 4604 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4605 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4606 Commas.push_back(Loc); 4607 Commas.push_back(Loc); 4608 OwningExprResult Call = ActOnCallExpr(/*Scope=*/0, 4609 Owned(BuiltinMemCpyRef->Retain()), 4610 Loc, move_arg(CallArgs), 4611 Commas.data(), Loc); 4612 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4613 Statements.push_back(Call.takeAs<Expr>()); 4614 continue; 4615 } 4616 4617 // Build the copy of this field. 4618 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4619 move(To), move(From), 4620 /*CopyingBaseSubobject=*/false); 4621 if (Copy.isInvalid()) { 4622 Diag(CurrentLocation, diag::note_member_synthesized_at) 4623 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4624 CopyAssignOperator->setInvalidDecl(); 4625 return; 4626 } 4627 4628 // Success! Record the copy. 4629 Statements.push_back(Copy.takeAs<Stmt>()); 4630 } 4631 4632 if (!Invalid) { 4633 // Add a "return *this;" 4634 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4635 Owned(This->Retain())); 4636 4637 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4638 if (Return.isInvalid()) 4639 Invalid = true; 4640 else { 4641 Statements.push_back(Return.takeAs<Stmt>()); 4642 4643 if (Trap.hasErrorOccurred()) { 4644 Diag(CurrentLocation, diag::note_member_synthesized_at) 4645 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4646 Invalid = true; 4647 } 4648 } 4649 } 4650 4651 if (Invalid) { 4652 CopyAssignOperator->setInvalidDecl(); 4653 return; 4654 } 4655 4656 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4657 /*isStmtExpr=*/false); 4658 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4659 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4660} 4661 4662void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4663 CXXConstructorDecl *CopyConstructor, 4664 unsigned TypeQuals) { 4665 assert((CopyConstructor->isImplicit() && 4666 CopyConstructor->isCopyConstructor(TypeQuals) && 4667 !CopyConstructor->isUsed()) && 4668 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4669 4670 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4671 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4672 4673 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4674 ErrorTrap Trap(*this); 4675 4676 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4677 Trap.hasErrorOccurred()) { 4678 Diag(CurrentLocation, diag::note_member_synthesized_at) 4679 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4680 CopyConstructor->setInvalidDecl(); 4681 } else { 4682 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4683 CopyConstructor->getLocation(), 4684 MultiStmtArg(*this, 0, 0), 4685 /*isStmtExpr=*/false) 4686 .takeAs<Stmt>()); 4687 } 4688 4689 CopyConstructor->setUsed(); 4690} 4691 4692Sema::OwningExprResult 4693Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4694 CXXConstructorDecl *Constructor, 4695 MultiExprArg ExprArgs, 4696 bool RequiresZeroInit, 4697 CXXConstructExpr::ConstructionKind ConstructKind) { 4698 bool Elidable = false; 4699 4700 // C++0x [class.copy]p34: 4701 // When certain criteria are met, an implementation is allowed to 4702 // omit the copy/move construction of a class object, even if the 4703 // copy/move constructor and/or destructor for the object have 4704 // side effects. [...] 4705 // - when a temporary class object that has not been bound to a 4706 // reference (12.2) would be copied/moved to a class object 4707 // with the same cv-unqualified type, the copy/move operation 4708 // can be omitted by constructing the temporary object 4709 // directly into the target of the omitted copy/move 4710 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4711 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4712 Elidable = SubExpr->isTemporaryObject() && 4713 Context.hasSameUnqualifiedType(SubExpr->getType(), 4714 Context.getTypeDeclType(Constructor->getParent())); 4715 } 4716 4717 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4718 Elidable, move(ExprArgs), RequiresZeroInit, 4719 ConstructKind); 4720} 4721 4722/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4723/// including handling of its default argument expressions. 4724Sema::OwningExprResult 4725Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4726 CXXConstructorDecl *Constructor, bool Elidable, 4727 MultiExprArg ExprArgs, 4728 bool RequiresZeroInit, 4729 CXXConstructExpr::ConstructionKind ConstructKind) { 4730 unsigned NumExprs = ExprArgs.size(); 4731 Expr **Exprs = (Expr **)ExprArgs.release(); 4732 4733 MarkDeclarationReferenced(ConstructLoc, Constructor); 4734 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4735 Constructor, Elidable, Exprs, NumExprs, 4736 RequiresZeroInit, ConstructKind)); 4737} 4738 4739bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4740 CXXConstructorDecl *Constructor, 4741 MultiExprArg Exprs) { 4742 OwningExprResult TempResult = 4743 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4744 move(Exprs)); 4745 if (TempResult.isInvalid()) 4746 return true; 4747 4748 Expr *Temp = TempResult.takeAs<Expr>(); 4749 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4750 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4751 VD->setInit(Temp); 4752 4753 return false; 4754} 4755 4756void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4757 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4758 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4759 !ClassDecl->hasTrivialDestructor()) { 4760 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4761 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4762 CheckDestructorAccess(VD->getLocation(), Destructor, 4763 PDiag(diag::err_access_dtor_var) 4764 << VD->getDeclName() 4765 << VD->getType()); 4766 } 4767} 4768 4769/// AddCXXDirectInitializerToDecl - This action is called immediately after 4770/// ActOnDeclarator, when a C++ direct initializer is present. 4771/// e.g: "int x(1);" 4772void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4773 SourceLocation LParenLoc, 4774 MultiExprArg Exprs, 4775 SourceLocation *CommaLocs, 4776 SourceLocation RParenLoc) { 4777 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4778 Decl *RealDecl = Dcl.getAs<Decl>(); 4779 4780 // If there is no declaration, there was an error parsing it. Just ignore 4781 // the initializer. 4782 if (RealDecl == 0) 4783 return; 4784 4785 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4786 if (!VDecl) { 4787 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4788 RealDecl->setInvalidDecl(); 4789 return; 4790 } 4791 4792 // We will represent direct-initialization similarly to copy-initialization: 4793 // int x(1); -as-> int x = 1; 4794 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4795 // 4796 // Clients that want to distinguish between the two forms, can check for 4797 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4798 // A major benefit is that clients that don't particularly care about which 4799 // exactly form was it (like the CodeGen) can handle both cases without 4800 // special case code. 4801 4802 // C++ 8.5p11: 4803 // The form of initialization (using parentheses or '=') is generally 4804 // insignificant, but does matter when the entity being initialized has a 4805 // class type. 4806 QualType DeclInitType = VDecl->getType(); 4807 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4808 DeclInitType = Context.getBaseElementType(Array); 4809 4810 if (!VDecl->getType()->isDependentType() && 4811 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4812 diag::err_typecheck_decl_incomplete_type)) { 4813 VDecl->setInvalidDecl(); 4814 return; 4815 } 4816 4817 // The variable can not have an abstract class type. 4818 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4819 diag::err_abstract_type_in_decl, 4820 AbstractVariableType)) 4821 VDecl->setInvalidDecl(); 4822 4823 const VarDecl *Def; 4824 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4825 Diag(VDecl->getLocation(), diag::err_redefinition) 4826 << VDecl->getDeclName(); 4827 Diag(Def->getLocation(), diag::note_previous_definition); 4828 VDecl->setInvalidDecl(); 4829 return; 4830 } 4831 4832 // If either the declaration has a dependent type or if any of the 4833 // expressions is type-dependent, we represent the initialization 4834 // via a ParenListExpr for later use during template instantiation. 4835 if (VDecl->getType()->isDependentType() || 4836 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4837 // Let clients know that initialization was done with a direct initializer. 4838 VDecl->setCXXDirectInitializer(true); 4839 4840 // Store the initialization expressions as a ParenListExpr. 4841 unsigned NumExprs = Exprs.size(); 4842 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4843 (Expr **)Exprs.release(), 4844 NumExprs, RParenLoc)); 4845 return; 4846 } 4847 4848 // Capture the variable that is being initialized and the style of 4849 // initialization. 4850 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4851 4852 // FIXME: Poor source location information. 4853 InitializationKind Kind 4854 = InitializationKind::CreateDirect(VDecl->getLocation(), 4855 LParenLoc, RParenLoc); 4856 4857 InitializationSequence InitSeq(*this, Entity, Kind, 4858 (Expr**)Exprs.get(), Exprs.size()); 4859 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4860 if (Result.isInvalid()) { 4861 VDecl->setInvalidDecl(); 4862 return; 4863 } 4864 4865 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4866 VDecl->setInit(Result.takeAs<Expr>()); 4867 VDecl->setCXXDirectInitializer(true); 4868 4869 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4870 FinalizeVarWithDestructor(VDecl, Record); 4871} 4872 4873/// \brief Given a constructor and the set of arguments provided for the 4874/// constructor, convert the arguments and add any required default arguments 4875/// to form a proper call to this constructor. 4876/// 4877/// \returns true if an error occurred, false otherwise. 4878bool 4879Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4880 MultiExprArg ArgsPtr, 4881 SourceLocation Loc, 4882 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4883 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4884 unsigned NumArgs = ArgsPtr.size(); 4885 Expr **Args = (Expr **)ArgsPtr.get(); 4886 4887 const FunctionProtoType *Proto 4888 = Constructor->getType()->getAs<FunctionProtoType>(); 4889 assert(Proto && "Constructor without a prototype?"); 4890 unsigned NumArgsInProto = Proto->getNumArgs(); 4891 4892 // If too few arguments are available, we'll fill in the rest with defaults. 4893 if (NumArgs < NumArgsInProto) 4894 ConvertedArgs.reserve(NumArgsInProto); 4895 else 4896 ConvertedArgs.reserve(NumArgs); 4897 4898 VariadicCallType CallType = 4899 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4900 llvm::SmallVector<Expr *, 8> AllArgs; 4901 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4902 Proto, 0, Args, NumArgs, AllArgs, 4903 CallType); 4904 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4905 ConvertedArgs.push_back(AllArgs[i]); 4906 return Invalid; 4907} 4908 4909static inline bool 4910CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4911 const FunctionDecl *FnDecl) { 4912 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4913 if (isa<NamespaceDecl>(DC)) { 4914 return SemaRef.Diag(FnDecl->getLocation(), 4915 diag::err_operator_new_delete_declared_in_namespace) 4916 << FnDecl->getDeclName(); 4917 } 4918 4919 if (isa<TranslationUnitDecl>(DC) && 4920 FnDecl->getStorageClass() == FunctionDecl::Static) { 4921 return SemaRef.Diag(FnDecl->getLocation(), 4922 diag::err_operator_new_delete_declared_static) 4923 << FnDecl->getDeclName(); 4924 } 4925 4926 return false; 4927} 4928 4929static inline bool 4930CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4931 CanQualType ExpectedResultType, 4932 CanQualType ExpectedFirstParamType, 4933 unsigned DependentParamTypeDiag, 4934 unsigned InvalidParamTypeDiag) { 4935 QualType ResultType = 4936 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4937 4938 // Check that the result type is not dependent. 4939 if (ResultType->isDependentType()) 4940 return SemaRef.Diag(FnDecl->getLocation(), 4941 diag::err_operator_new_delete_dependent_result_type) 4942 << FnDecl->getDeclName() << ExpectedResultType; 4943 4944 // Check that the result type is what we expect. 4945 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4946 return SemaRef.Diag(FnDecl->getLocation(), 4947 diag::err_operator_new_delete_invalid_result_type) 4948 << FnDecl->getDeclName() << ExpectedResultType; 4949 4950 // A function template must have at least 2 parameters. 4951 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4952 return SemaRef.Diag(FnDecl->getLocation(), 4953 diag::err_operator_new_delete_template_too_few_parameters) 4954 << FnDecl->getDeclName(); 4955 4956 // The function decl must have at least 1 parameter. 4957 if (FnDecl->getNumParams() == 0) 4958 return SemaRef.Diag(FnDecl->getLocation(), 4959 diag::err_operator_new_delete_too_few_parameters) 4960 << FnDecl->getDeclName(); 4961 4962 // Check the the first parameter type is not dependent. 4963 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4964 if (FirstParamType->isDependentType()) 4965 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4966 << FnDecl->getDeclName() << ExpectedFirstParamType; 4967 4968 // Check that the first parameter type is what we expect. 4969 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4970 ExpectedFirstParamType) 4971 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4972 << FnDecl->getDeclName() << ExpectedFirstParamType; 4973 4974 return false; 4975} 4976 4977static bool 4978CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4979 // C++ [basic.stc.dynamic.allocation]p1: 4980 // A program is ill-formed if an allocation function is declared in a 4981 // namespace scope other than global scope or declared static in global 4982 // scope. 4983 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4984 return true; 4985 4986 CanQualType SizeTy = 4987 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4988 4989 // C++ [basic.stc.dynamic.allocation]p1: 4990 // The return type shall be void*. The first parameter shall have type 4991 // std::size_t. 4992 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4993 SizeTy, 4994 diag::err_operator_new_dependent_param_type, 4995 diag::err_operator_new_param_type)) 4996 return true; 4997 4998 // C++ [basic.stc.dynamic.allocation]p1: 4999 // The first parameter shall not have an associated default argument. 5000 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5001 return SemaRef.Diag(FnDecl->getLocation(), 5002 diag::err_operator_new_default_arg) 5003 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5004 5005 return false; 5006} 5007 5008static bool 5009CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5010 // C++ [basic.stc.dynamic.deallocation]p1: 5011 // A program is ill-formed if deallocation functions are declared in a 5012 // namespace scope other than global scope or declared static in global 5013 // scope. 5014 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5015 return true; 5016 5017 // C++ [basic.stc.dynamic.deallocation]p2: 5018 // Each deallocation function shall return void and its first parameter 5019 // shall be void*. 5020 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5021 SemaRef.Context.VoidPtrTy, 5022 diag::err_operator_delete_dependent_param_type, 5023 diag::err_operator_delete_param_type)) 5024 return true; 5025 5026 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5027 if (FirstParamType->isDependentType()) 5028 return SemaRef.Diag(FnDecl->getLocation(), 5029 diag::err_operator_delete_dependent_param_type) 5030 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5031 5032 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5033 SemaRef.Context.VoidPtrTy) 5034 return SemaRef.Diag(FnDecl->getLocation(), 5035 diag::err_operator_delete_param_type) 5036 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5037 5038 return false; 5039} 5040 5041/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5042/// of this overloaded operator is well-formed. If so, returns false; 5043/// otherwise, emits appropriate diagnostics and returns true. 5044bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5045 assert(FnDecl && FnDecl->isOverloadedOperator() && 5046 "Expected an overloaded operator declaration"); 5047 5048 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5049 5050 // C++ [over.oper]p5: 5051 // The allocation and deallocation functions, operator new, 5052 // operator new[], operator delete and operator delete[], are 5053 // described completely in 3.7.3. The attributes and restrictions 5054 // found in the rest of this subclause do not apply to them unless 5055 // explicitly stated in 3.7.3. 5056 if (Op == OO_Delete || Op == OO_Array_Delete) 5057 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5058 5059 if (Op == OO_New || Op == OO_Array_New) 5060 return CheckOperatorNewDeclaration(*this, FnDecl); 5061 5062 // C++ [over.oper]p6: 5063 // An operator function shall either be a non-static member 5064 // function or be a non-member function and have at least one 5065 // parameter whose type is a class, a reference to a class, an 5066 // enumeration, or a reference to an enumeration. 5067 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5068 if (MethodDecl->isStatic()) 5069 return Diag(FnDecl->getLocation(), 5070 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5071 } else { 5072 bool ClassOrEnumParam = false; 5073 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5074 ParamEnd = FnDecl->param_end(); 5075 Param != ParamEnd; ++Param) { 5076 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5077 if (ParamType->isDependentType() || ParamType->isRecordType() || 5078 ParamType->isEnumeralType()) { 5079 ClassOrEnumParam = true; 5080 break; 5081 } 5082 } 5083 5084 if (!ClassOrEnumParam) 5085 return Diag(FnDecl->getLocation(), 5086 diag::err_operator_overload_needs_class_or_enum) 5087 << FnDecl->getDeclName(); 5088 } 5089 5090 // C++ [over.oper]p8: 5091 // An operator function cannot have default arguments (8.3.6), 5092 // except where explicitly stated below. 5093 // 5094 // Only the function-call operator allows default arguments 5095 // (C++ [over.call]p1). 5096 if (Op != OO_Call) { 5097 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5098 Param != FnDecl->param_end(); ++Param) { 5099 if ((*Param)->hasDefaultArg()) 5100 return Diag((*Param)->getLocation(), 5101 diag::err_operator_overload_default_arg) 5102 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5103 } 5104 } 5105 5106 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5107 { false, false, false } 5108#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5109 , { Unary, Binary, MemberOnly } 5110#include "clang/Basic/OperatorKinds.def" 5111 }; 5112 5113 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5114 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5115 bool MustBeMemberOperator = OperatorUses[Op][2]; 5116 5117 // C++ [over.oper]p8: 5118 // [...] Operator functions cannot have more or fewer parameters 5119 // than the number required for the corresponding operator, as 5120 // described in the rest of this subclause. 5121 unsigned NumParams = FnDecl->getNumParams() 5122 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5123 if (Op != OO_Call && 5124 ((NumParams == 1 && !CanBeUnaryOperator) || 5125 (NumParams == 2 && !CanBeBinaryOperator) || 5126 (NumParams < 1) || (NumParams > 2))) { 5127 // We have the wrong number of parameters. 5128 unsigned ErrorKind; 5129 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5130 ErrorKind = 2; // 2 -> unary or binary. 5131 } else if (CanBeUnaryOperator) { 5132 ErrorKind = 0; // 0 -> unary 5133 } else { 5134 assert(CanBeBinaryOperator && 5135 "All non-call overloaded operators are unary or binary!"); 5136 ErrorKind = 1; // 1 -> binary 5137 } 5138 5139 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5140 << FnDecl->getDeclName() << NumParams << ErrorKind; 5141 } 5142 5143 // Overloaded operators other than operator() cannot be variadic. 5144 if (Op != OO_Call && 5145 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5146 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5147 << FnDecl->getDeclName(); 5148 } 5149 5150 // Some operators must be non-static member functions. 5151 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5152 return Diag(FnDecl->getLocation(), 5153 diag::err_operator_overload_must_be_member) 5154 << FnDecl->getDeclName(); 5155 } 5156 5157 // C++ [over.inc]p1: 5158 // The user-defined function called operator++ implements the 5159 // prefix and postfix ++ operator. If this function is a member 5160 // function with no parameters, or a non-member function with one 5161 // parameter of class or enumeration type, it defines the prefix 5162 // increment operator ++ for objects of that type. If the function 5163 // is a member function with one parameter (which shall be of type 5164 // int) or a non-member function with two parameters (the second 5165 // of which shall be of type int), it defines the postfix 5166 // increment operator ++ for objects of that type. 5167 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5168 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5169 bool ParamIsInt = false; 5170 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5171 ParamIsInt = BT->getKind() == BuiltinType::Int; 5172 5173 if (!ParamIsInt) 5174 return Diag(LastParam->getLocation(), 5175 diag::err_operator_overload_post_incdec_must_be_int) 5176 << LastParam->getType() << (Op == OO_MinusMinus); 5177 } 5178 5179 // Notify the class if it got an assignment operator. 5180 if (Op == OO_Equal) { 5181 // Would have returned earlier otherwise. 5182 assert(isa<CXXMethodDecl>(FnDecl) && 5183 "Overloaded = not member, but not filtered."); 5184 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5185 Method->getParent()->addedAssignmentOperator(Context, Method); 5186 } 5187 5188 return false; 5189} 5190 5191/// CheckLiteralOperatorDeclaration - Check whether the declaration 5192/// of this literal operator function is well-formed. If so, returns 5193/// false; otherwise, emits appropriate diagnostics and returns true. 5194bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5195 DeclContext *DC = FnDecl->getDeclContext(); 5196 Decl::Kind Kind = DC->getDeclKind(); 5197 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5198 Kind != Decl::LinkageSpec) { 5199 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5200 << FnDecl->getDeclName(); 5201 return true; 5202 } 5203 5204 bool Valid = false; 5205 5206 // template <char...> type operator "" name() is the only valid template 5207 // signature, and the only valid signature with no parameters. 5208 if (FnDecl->param_size() == 0) { 5209 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5210 // Must have only one template parameter 5211 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5212 if (Params->size() == 1) { 5213 NonTypeTemplateParmDecl *PmDecl = 5214 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5215 5216 // The template parameter must be a char parameter pack. 5217 // FIXME: This test will always fail because non-type parameter packs 5218 // have not been implemented. 5219 if (PmDecl && PmDecl->isTemplateParameterPack() && 5220 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5221 Valid = true; 5222 } 5223 } 5224 } else { 5225 // Check the first parameter 5226 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5227 5228 QualType T = (*Param)->getType(); 5229 5230 // unsigned long long int, long double, and any character type are allowed 5231 // as the only parameters. 5232 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5233 Context.hasSameType(T, Context.LongDoubleTy) || 5234 Context.hasSameType(T, Context.CharTy) || 5235 Context.hasSameType(T, Context.WCharTy) || 5236 Context.hasSameType(T, Context.Char16Ty) || 5237 Context.hasSameType(T, Context.Char32Ty)) { 5238 if (++Param == FnDecl->param_end()) 5239 Valid = true; 5240 goto FinishedParams; 5241 } 5242 5243 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5244 const PointerType *PT = T->getAs<PointerType>(); 5245 if (!PT) 5246 goto FinishedParams; 5247 T = PT->getPointeeType(); 5248 if (!T.isConstQualified()) 5249 goto FinishedParams; 5250 T = T.getUnqualifiedType(); 5251 5252 // Move on to the second parameter; 5253 ++Param; 5254 5255 // If there is no second parameter, the first must be a const char * 5256 if (Param == FnDecl->param_end()) { 5257 if (Context.hasSameType(T, Context.CharTy)) 5258 Valid = true; 5259 goto FinishedParams; 5260 } 5261 5262 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5263 // are allowed as the first parameter to a two-parameter function 5264 if (!(Context.hasSameType(T, Context.CharTy) || 5265 Context.hasSameType(T, Context.WCharTy) || 5266 Context.hasSameType(T, Context.Char16Ty) || 5267 Context.hasSameType(T, Context.Char32Ty))) 5268 goto FinishedParams; 5269 5270 // The second and final parameter must be an std::size_t 5271 T = (*Param)->getType().getUnqualifiedType(); 5272 if (Context.hasSameType(T, Context.getSizeType()) && 5273 ++Param == FnDecl->param_end()) 5274 Valid = true; 5275 } 5276 5277 // FIXME: This diagnostic is absolutely terrible. 5278FinishedParams: 5279 if (!Valid) { 5280 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5281 << FnDecl->getDeclName(); 5282 return true; 5283 } 5284 5285 return false; 5286} 5287 5288/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5289/// linkage specification, including the language and (if present) 5290/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5291/// the location of the language string literal, which is provided 5292/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5293/// the '{' brace. Otherwise, this linkage specification does not 5294/// have any braces. 5295Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5296 SourceLocation ExternLoc, 5297 SourceLocation LangLoc, 5298 llvm::StringRef Lang, 5299 SourceLocation LBraceLoc) { 5300 LinkageSpecDecl::LanguageIDs Language; 5301 if (Lang == "\"C\"") 5302 Language = LinkageSpecDecl::lang_c; 5303 else if (Lang == "\"C++\"") 5304 Language = LinkageSpecDecl::lang_cxx; 5305 else { 5306 Diag(LangLoc, diag::err_bad_language); 5307 return DeclPtrTy(); 5308 } 5309 5310 // FIXME: Add all the various semantics of linkage specifications 5311 5312 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5313 LangLoc, Language, 5314 LBraceLoc.isValid()); 5315 CurContext->addDecl(D); 5316 PushDeclContext(S, D); 5317 return DeclPtrTy::make(D); 5318} 5319 5320/// ActOnFinishLinkageSpecification - Completely the definition of 5321/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5322/// valid, it's the position of the closing '}' brace in a linkage 5323/// specification that uses braces. 5324Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5325 DeclPtrTy LinkageSpec, 5326 SourceLocation RBraceLoc) { 5327 if (LinkageSpec) 5328 PopDeclContext(); 5329 return LinkageSpec; 5330} 5331 5332/// \brief Perform semantic analysis for the variable declaration that 5333/// occurs within a C++ catch clause, returning the newly-created 5334/// variable. 5335VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5336 TypeSourceInfo *TInfo, 5337 IdentifierInfo *Name, 5338 SourceLocation Loc, 5339 SourceRange Range) { 5340 bool Invalid = false; 5341 5342 // Arrays and functions decay. 5343 if (ExDeclType->isArrayType()) 5344 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5345 else if (ExDeclType->isFunctionType()) 5346 ExDeclType = Context.getPointerType(ExDeclType); 5347 5348 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5349 // The exception-declaration shall not denote a pointer or reference to an 5350 // incomplete type, other than [cv] void*. 5351 // N2844 forbids rvalue references. 5352 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5353 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5354 Invalid = true; 5355 } 5356 5357 // GCC allows catching pointers and references to incomplete types 5358 // as an extension; so do we, but we warn by default. 5359 5360 QualType BaseType = ExDeclType; 5361 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5362 unsigned DK = diag::err_catch_incomplete; 5363 bool IncompleteCatchIsInvalid = true; 5364 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5365 BaseType = Ptr->getPointeeType(); 5366 Mode = 1; 5367 DK = diag::ext_catch_incomplete_ptr; 5368 IncompleteCatchIsInvalid = false; 5369 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5370 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5371 BaseType = Ref->getPointeeType(); 5372 Mode = 2; 5373 DK = diag::ext_catch_incomplete_ref; 5374 IncompleteCatchIsInvalid = false; 5375 } 5376 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5377 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5378 IncompleteCatchIsInvalid) 5379 Invalid = true; 5380 5381 if (!Invalid && !ExDeclType->isDependentType() && 5382 RequireNonAbstractType(Loc, ExDeclType, 5383 diag::err_abstract_type_in_decl, 5384 AbstractVariableType)) 5385 Invalid = true; 5386 5387 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5388 Name, ExDeclType, TInfo, VarDecl::None, 5389 VarDecl::None); 5390 ExDecl->setExceptionVariable(true); 5391 5392 if (!Invalid) { 5393 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5394 // C++ [except.handle]p16: 5395 // The object declared in an exception-declaration or, if the 5396 // exception-declaration does not specify a name, a temporary (12.2) is 5397 // copy-initialized (8.5) from the exception object. [...] 5398 // The object is destroyed when the handler exits, after the destruction 5399 // of any automatic objects initialized within the handler. 5400 // 5401 // We just pretend to initialize the object with itself, then make sure 5402 // it can be destroyed later. 5403 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5404 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5405 Loc, ExDeclType, 0); 5406 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5407 SourceLocation()); 5408 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5409 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5410 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5411 if (Result.isInvalid()) 5412 Invalid = true; 5413 else 5414 FinalizeVarWithDestructor(ExDecl, RecordTy); 5415 } 5416 } 5417 5418 if (Invalid) 5419 ExDecl->setInvalidDecl(); 5420 5421 return ExDecl; 5422} 5423 5424/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5425/// handler. 5426Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5427 TypeSourceInfo *TInfo = 0; 5428 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5429 5430 bool Invalid = D.isInvalidType(); 5431 IdentifierInfo *II = D.getIdentifier(); 5432 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5433 LookupOrdinaryName, 5434 ForRedeclaration)) { 5435 // The scope should be freshly made just for us. There is just no way 5436 // it contains any previous declaration. 5437 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5438 if (PrevDecl->isTemplateParameter()) { 5439 // Maybe we will complain about the shadowed template parameter. 5440 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5441 } 5442 } 5443 5444 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5445 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5446 << D.getCXXScopeSpec().getRange(); 5447 Invalid = true; 5448 } 5449 5450 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5451 D.getIdentifier(), 5452 D.getIdentifierLoc(), 5453 D.getDeclSpec().getSourceRange()); 5454 5455 if (Invalid) 5456 ExDecl->setInvalidDecl(); 5457 5458 // Add the exception declaration into this scope. 5459 if (II) 5460 PushOnScopeChains(ExDecl, S); 5461 else 5462 CurContext->addDecl(ExDecl); 5463 5464 ProcessDeclAttributes(S, ExDecl, D); 5465 return DeclPtrTy::make(ExDecl); 5466} 5467 5468Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5469 ExprArg assertexpr, 5470 ExprArg assertmessageexpr) { 5471 Expr *AssertExpr = (Expr *)assertexpr.get(); 5472 StringLiteral *AssertMessage = 5473 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5474 5475 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5476 llvm::APSInt Value(32); 5477 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5478 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5479 AssertExpr->getSourceRange(); 5480 return DeclPtrTy(); 5481 } 5482 5483 if (Value == 0) { 5484 Diag(AssertLoc, diag::err_static_assert_failed) 5485 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5486 } 5487 } 5488 5489 assertexpr.release(); 5490 assertmessageexpr.release(); 5491 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5492 AssertExpr, AssertMessage); 5493 5494 CurContext->addDecl(Decl); 5495 return DeclPtrTy::make(Decl); 5496} 5497 5498/// \brief Perform semantic analysis of the given friend type declaration. 5499/// 5500/// \returns A friend declaration that. 5501FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5502 TypeSourceInfo *TSInfo) { 5503 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5504 5505 QualType T = TSInfo->getType(); 5506 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5507 5508 if (!getLangOptions().CPlusPlus0x) { 5509 // C++03 [class.friend]p2: 5510 // An elaborated-type-specifier shall be used in a friend declaration 5511 // for a class.* 5512 // 5513 // * The class-key of the elaborated-type-specifier is required. 5514 if (!ActiveTemplateInstantiations.empty()) { 5515 // Do not complain about the form of friend template types during 5516 // template instantiation; we will already have complained when the 5517 // template was declared. 5518 } else if (!T->isElaboratedTypeSpecifier()) { 5519 // If we evaluated the type to a record type, suggest putting 5520 // a tag in front. 5521 if (const RecordType *RT = T->getAs<RecordType>()) { 5522 RecordDecl *RD = RT->getDecl(); 5523 5524 std::string InsertionText = std::string(" ") + RD->getKindName(); 5525 5526 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5527 << (unsigned) RD->getTagKind() 5528 << T 5529 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5530 InsertionText); 5531 } else { 5532 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5533 << T 5534 << SourceRange(FriendLoc, TypeRange.getEnd()); 5535 } 5536 } else if (T->getAs<EnumType>()) { 5537 Diag(FriendLoc, diag::ext_enum_friend) 5538 << T 5539 << SourceRange(FriendLoc, TypeRange.getEnd()); 5540 } 5541 } 5542 5543 // C++0x [class.friend]p3: 5544 // If the type specifier in a friend declaration designates a (possibly 5545 // cv-qualified) class type, that class is declared as a friend; otherwise, 5546 // the friend declaration is ignored. 5547 5548 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5549 // in [class.friend]p3 that we do not implement. 5550 5551 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5552} 5553 5554/// Handle a friend type declaration. This works in tandem with 5555/// ActOnTag. 5556/// 5557/// Notes on friend class templates: 5558/// 5559/// We generally treat friend class declarations as if they were 5560/// declaring a class. So, for example, the elaborated type specifier 5561/// in a friend declaration is required to obey the restrictions of a 5562/// class-head (i.e. no typedefs in the scope chain), template 5563/// parameters are required to match up with simple template-ids, &c. 5564/// However, unlike when declaring a template specialization, it's 5565/// okay to refer to a template specialization without an empty 5566/// template parameter declaration, e.g. 5567/// friend class A<T>::B<unsigned>; 5568/// We permit this as a special case; if there are any template 5569/// parameters present at all, require proper matching, i.e. 5570/// template <> template <class T> friend class A<int>::B; 5571Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5572 MultiTemplateParamsArg TempParams) { 5573 SourceLocation Loc = DS.getSourceRange().getBegin(); 5574 5575 assert(DS.isFriendSpecified()); 5576 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5577 5578 // Try to convert the decl specifier to a type. This works for 5579 // friend templates because ActOnTag never produces a ClassTemplateDecl 5580 // for a TUK_Friend. 5581 Declarator TheDeclarator(DS, Declarator::MemberContext); 5582 TypeSourceInfo *TSI; 5583 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5584 if (TheDeclarator.isInvalidType()) 5585 return DeclPtrTy(); 5586 5587 if (!TSI) 5588 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5589 5590 // This is definitely an error in C++98. It's probably meant to 5591 // be forbidden in C++0x, too, but the specification is just 5592 // poorly written. 5593 // 5594 // The problem is with declarations like the following: 5595 // template <T> friend A<T>::foo; 5596 // where deciding whether a class C is a friend or not now hinges 5597 // on whether there exists an instantiation of A that causes 5598 // 'foo' to equal C. There are restrictions on class-heads 5599 // (which we declare (by fiat) elaborated friend declarations to 5600 // be) that makes this tractable. 5601 // 5602 // FIXME: handle "template <> friend class A<T>;", which 5603 // is possibly well-formed? Who even knows? 5604 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5605 Diag(Loc, diag::err_tagless_friend_type_template) 5606 << DS.getSourceRange(); 5607 return DeclPtrTy(); 5608 } 5609 5610 // C++98 [class.friend]p1: A friend of a class is a function 5611 // or class that is not a member of the class . . . 5612 // This is fixed in DR77, which just barely didn't make the C++03 5613 // deadline. It's also a very silly restriction that seriously 5614 // affects inner classes and which nobody else seems to implement; 5615 // thus we never diagnose it, not even in -pedantic. 5616 // 5617 // But note that we could warn about it: it's always useless to 5618 // friend one of your own members (it's not, however, worthless to 5619 // friend a member of an arbitrary specialization of your template). 5620 5621 Decl *D; 5622 if (unsigned NumTempParamLists = TempParams.size()) 5623 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5624 NumTempParamLists, 5625 (TemplateParameterList**) TempParams.release(), 5626 TSI, 5627 DS.getFriendSpecLoc()); 5628 else 5629 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5630 5631 if (!D) 5632 return DeclPtrTy(); 5633 5634 D->setAccess(AS_public); 5635 CurContext->addDecl(D); 5636 5637 return DeclPtrTy::make(D); 5638} 5639 5640Sema::DeclPtrTy 5641Sema::ActOnFriendFunctionDecl(Scope *S, 5642 Declarator &D, 5643 bool IsDefinition, 5644 MultiTemplateParamsArg TemplateParams) { 5645 const DeclSpec &DS = D.getDeclSpec(); 5646 5647 assert(DS.isFriendSpecified()); 5648 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5649 5650 SourceLocation Loc = D.getIdentifierLoc(); 5651 TypeSourceInfo *TInfo = 0; 5652 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5653 5654 // C++ [class.friend]p1 5655 // A friend of a class is a function or class.... 5656 // Note that this sees through typedefs, which is intended. 5657 // It *doesn't* see through dependent types, which is correct 5658 // according to [temp.arg.type]p3: 5659 // If a declaration acquires a function type through a 5660 // type dependent on a template-parameter and this causes 5661 // a declaration that does not use the syntactic form of a 5662 // function declarator to have a function type, the program 5663 // is ill-formed. 5664 if (!T->isFunctionType()) { 5665 Diag(Loc, diag::err_unexpected_friend); 5666 5667 // It might be worthwhile to try to recover by creating an 5668 // appropriate declaration. 5669 return DeclPtrTy(); 5670 } 5671 5672 // C++ [namespace.memdef]p3 5673 // - If a friend declaration in a non-local class first declares a 5674 // class or function, the friend class or function is a member 5675 // of the innermost enclosing namespace. 5676 // - The name of the friend is not found by simple name lookup 5677 // until a matching declaration is provided in that namespace 5678 // scope (either before or after the class declaration granting 5679 // friendship). 5680 // - If a friend function is called, its name may be found by the 5681 // name lookup that considers functions from namespaces and 5682 // classes associated with the types of the function arguments. 5683 // - When looking for a prior declaration of a class or a function 5684 // declared as a friend, scopes outside the innermost enclosing 5685 // namespace scope are not considered. 5686 5687 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5688 DeclarationName Name = GetNameForDeclarator(D); 5689 assert(Name); 5690 5691 // The context we found the declaration in, or in which we should 5692 // create the declaration. 5693 DeclContext *DC; 5694 5695 // FIXME: handle local classes 5696 5697 // Recover from invalid scope qualifiers as if they just weren't there. 5698 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5699 ForRedeclaration); 5700 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5701 DC = computeDeclContext(ScopeQual); 5702 5703 // FIXME: handle dependent contexts 5704 if (!DC) return DeclPtrTy(); 5705 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5706 5707 LookupQualifiedName(Previous, DC); 5708 5709 // If searching in that context implicitly found a declaration in 5710 // a different context, treat it like it wasn't found at all. 5711 // TODO: better diagnostics for this case. Suggesting the right 5712 // qualified scope would be nice... 5713 // FIXME: getRepresentativeDecl() is not right here at all 5714 if (Previous.empty() || 5715 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5716 D.setInvalidType(); 5717 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5718 return DeclPtrTy(); 5719 } 5720 5721 // C++ [class.friend]p1: A friend of a class is a function or 5722 // class that is not a member of the class . . . 5723 if (DC->Equals(CurContext)) 5724 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5725 5726 // Otherwise walk out to the nearest namespace scope looking for matches. 5727 } else { 5728 // TODO: handle local class contexts. 5729 5730 DC = CurContext; 5731 while (true) { 5732 // Skip class contexts. If someone can cite chapter and verse 5733 // for this behavior, that would be nice --- it's what GCC and 5734 // EDG do, and it seems like a reasonable intent, but the spec 5735 // really only says that checks for unqualified existing 5736 // declarations should stop at the nearest enclosing namespace, 5737 // not that they should only consider the nearest enclosing 5738 // namespace. 5739 while (DC->isRecord()) 5740 DC = DC->getParent(); 5741 5742 LookupQualifiedName(Previous, DC); 5743 5744 // TODO: decide what we think about using declarations. 5745 if (!Previous.empty()) 5746 break; 5747 5748 if (DC->isFileContext()) break; 5749 DC = DC->getParent(); 5750 } 5751 5752 // C++ [class.friend]p1: A friend of a class is a function or 5753 // class that is not a member of the class . . . 5754 // C++0x changes this for both friend types and functions. 5755 // Most C++ 98 compilers do seem to give an error here, so 5756 // we do, too. 5757 if (!Previous.empty() && DC->Equals(CurContext) 5758 && !getLangOptions().CPlusPlus0x) 5759 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5760 } 5761 5762 if (DC->isFileContext()) { 5763 // This implies that it has to be an operator or function. 5764 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5765 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5766 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5767 Diag(Loc, diag::err_introducing_special_friend) << 5768 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5769 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5770 return DeclPtrTy(); 5771 } 5772 } 5773 5774 bool Redeclaration = false; 5775 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5776 move(TemplateParams), 5777 IsDefinition, 5778 Redeclaration); 5779 if (!ND) return DeclPtrTy(); 5780 5781 assert(ND->getDeclContext() == DC); 5782 assert(ND->getLexicalDeclContext() == CurContext); 5783 5784 // Add the function declaration to the appropriate lookup tables, 5785 // adjusting the redeclarations list as necessary. We don't 5786 // want to do this yet if the friending class is dependent. 5787 // 5788 // Also update the scope-based lookup if the target context's 5789 // lookup context is in lexical scope. 5790 if (!CurContext->isDependentContext()) { 5791 DC = DC->getLookupContext(); 5792 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5793 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5794 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5795 } 5796 5797 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5798 D.getIdentifierLoc(), ND, 5799 DS.getFriendSpecLoc()); 5800 FrD->setAccess(AS_public); 5801 CurContext->addDecl(FrD); 5802 5803 return DeclPtrTy::make(ND); 5804} 5805 5806void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5807 AdjustDeclIfTemplate(dcl); 5808 5809 Decl *Dcl = dcl.getAs<Decl>(); 5810 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5811 if (!Fn) { 5812 Diag(DelLoc, diag::err_deleted_non_function); 5813 return; 5814 } 5815 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5816 Diag(DelLoc, diag::err_deleted_decl_not_first); 5817 Diag(Prev->getLocation(), diag::note_previous_declaration); 5818 // If the declaration wasn't the first, we delete the function anyway for 5819 // recovery. 5820 } 5821 Fn->setDeleted(); 5822} 5823 5824static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5825 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5826 ++CI) { 5827 Stmt *SubStmt = *CI; 5828 if (!SubStmt) 5829 continue; 5830 if (isa<ReturnStmt>(SubStmt)) 5831 Self.Diag(SubStmt->getSourceRange().getBegin(), 5832 diag::err_return_in_constructor_handler); 5833 if (!isa<Expr>(SubStmt)) 5834 SearchForReturnInStmt(Self, SubStmt); 5835 } 5836} 5837 5838void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5839 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5840 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5841 SearchForReturnInStmt(*this, Handler); 5842 } 5843} 5844 5845bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5846 const CXXMethodDecl *Old) { 5847 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5848 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5849 5850 if (Context.hasSameType(NewTy, OldTy) || 5851 NewTy->isDependentType() || OldTy->isDependentType()) 5852 return false; 5853 5854 // Check if the return types are covariant 5855 QualType NewClassTy, OldClassTy; 5856 5857 /// Both types must be pointers or references to classes. 5858 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5859 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5860 NewClassTy = NewPT->getPointeeType(); 5861 OldClassTy = OldPT->getPointeeType(); 5862 } 5863 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5864 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5865 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5866 NewClassTy = NewRT->getPointeeType(); 5867 OldClassTy = OldRT->getPointeeType(); 5868 } 5869 } 5870 } 5871 5872 // The return types aren't either both pointers or references to a class type. 5873 if (NewClassTy.isNull()) { 5874 Diag(New->getLocation(), 5875 diag::err_different_return_type_for_overriding_virtual_function) 5876 << New->getDeclName() << NewTy << OldTy; 5877 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5878 5879 return true; 5880 } 5881 5882 // C++ [class.virtual]p6: 5883 // If the return type of D::f differs from the return type of B::f, the 5884 // class type in the return type of D::f shall be complete at the point of 5885 // declaration of D::f or shall be the class type D. 5886 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5887 if (!RT->isBeingDefined() && 5888 RequireCompleteType(New->getLocation(), NewClassTy, 5889 PDiag(diag::err_covariant_return_incomplete) 5890 << New->getDeclName())) 5891 return true; 5892 } 5893 5894 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5895 // Check if the new class derives from the old class. 5896 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5897 Diag(New->getLocation(), 5898 diag::err_covariant_return_not_derived) 5899 << New->getDeclName() << NewTy << OldTy; 5900 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5901 return true; 5902 } 5903 5904 // Check if we the conversion from derived to base is valid. 5905 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5906 diag::err_covariant_return_inaccessible_base, 5907 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5908 // FIXME: Should this point to the return type? 5909 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5910 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5911 return true; 5912 } 5913 } 5914 5915 // The qualifiers of the return types must be the same. 5916 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5917 Diag(New->getLocation(), 5918 diag::err_covariant_return_type_different_qualifications) 5919 << New->getDeclName() << NewTy << OldTy; 5920 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5921 return true; 5922 }; 5923 5924 5925 // The new class type must have the same or less qualifiers as the old type. 5926 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5927 Diag(New->getLocation(), 5928 diag::err_covariant_return_type_class_type_more_qualified) 5929 << New->getDeclName() << NewTy << OldTy; 5930 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5931 return true; 5932 }; 5933 5934 return false; 5935} 5936 5937bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5938 const CXXMethodDecl *Old) 5939{ 5940 if (Old->hasAttr<FinalAttr>()) { 5941 Diag(New->getLocation(), diag::err_final_function_overridden) 5942 << New->getDeclName(); 5943 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5944 return true; 5945 } 5946 5947 return false; 5948} 5949 5950/// \brief Mark the given method pure. 5951/// 5952/// \param Method the method to be marked pure. 5953/// 5954/// \param InitRange the source range that covers the "0" initializer. 5955bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5956 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5957 Method->setPure(); 5958 5959 // A class is abstract if at least one function is pure virtual. 5960 Method->getParent()->setAbstract(true); 5961 return false; 5962 } 5963 5964 if (!Method->isInvalidDecl()) 5965 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5966 << Method->getDeclName() << InitRange; 5967 return true; 5968} 5969 5970/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5971/// an initializer for the out-of-line declaration 'Dcl'. The scope 5972/// is a fresh scope pushed for just this purpose. 5973/// 5974/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5975/// static data member of class X, names should be looked up in the scope of 5976/// class X. 5977void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5978 // If there is no declaration, there was an error parsing it. 5979 Decl *D = Dcl.getAs<Decl>(); 5980 if (D == 0) return; 5981 5982 // We should only get called for declarations with scope specifiers, like: 5983 // int foo::bar; 5984 assert(D->isOutOfLine()); 5985 EnterDeclaratorContext(S, D->getDeclContext()); 5986} 5987 5988/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5989/// initializer for the out-of-line declaration 'Dcl'. 5990void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5991 // If there is no declaration, there was an error parsing it. 5992 Decl *D = Dcl.getAs<Decl>(); 5993 if (D == 0) return; 5994 5995 assert(D->isOutOfLine()); 5996 ExitDeclaratorContext(S); 5997} 5998 5999/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6000/// C++ if/switch/while/for statement. 6001/// e.g: "if (int x = f()) {...}" 6002Action::DeclResult 6003Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6004 // C++ 6.4p2: 6005 // The declarator shall not specify a function or an array. 6006 // The type-specifier-seq shall not contain typedef and shall not declare a 6007 // new class or enumeration. 6008 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6009 "Parser allowed 'typedef' as storage class of condition decl."); 6010 6011 TypeSourceInfo *TInfo = 0; 6012 TagDecl *OwnedTag = 0; 6013 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 6014 6015 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6016 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6017 // would be created and CXXConditionDeclExpr wants a VarDecl. 6018 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6019 << D.getSourceRange(); 6020 return DeclResult(); 6021 } else if (OwnedTag && OwnedTag->isDefinition()) { 6022 // The type-specifier-seq shall not declare a new class or enumeration. 6023 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6024 } 6025 6026 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6027 if (!Dcl) 6028 return DeclResult(); 6029 6030 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6031 VD->setDeclaredInCondition(true); 6032 return Dcl; 6033} 6034 6035void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6036 bool DefinitionRequired) { 6037 // Ignore any vtable uses in unevaluated operands or for classes that do 6038 // not have a vtable. 6039 if (!Class->isDynamicClass() || Class->isDependentContext() || 6040 CurContext->isDependentContext() || 6041 ExprEvalContexts.back().Context == Unevaluated) 6042 return; 6043 6044 // Try to insert this class into the map. 6045 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6046 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6047 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6048 if (!Pos.second) { 6049 Pos.first->second = Pos.first->second || DefinitionRequired; 6050 return; 6051 } 6052 6053 // Local classes need to have their virtual members marked 6054 // immediately. For all other classes, we mark their virtual members 6055 // at the end of the translation unit. 6056 if (Class->isLocalClass()) 6057 MarkVirtualMembersReferenced(Loc, Class); 6058 else 6059 VTableUses.push_back(std::make_pair(Class, Loc)); 6060} 6061 6062bool Sema::DefineUsedVTables() { 6063 // If any dynamic classes have their key function defined within 6064 // this translation unit, then those vtables are considered "used" and must 6065 // be emitted. 6066 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6067 if (const CXXMethodDecl *KeyFunction 6068 = Context.getKeyFunction(DynamicClasses[I])) { 6069 const FunctionDecl *Definition = 0; 6070 if (KeyFunction->getBody(Definition)) 6071 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6072 } 6073 } 6074 6075 if (VTableUses.empty()) 6076 return false; 6077 6078 // Note: The VTableUses vector could grow as a result of marking 6079 // the members of a class as "used", so we check the size each 6080 // time through the loop and prefer indices (with are stable) to 6081 // iterators (which are not). 6082 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6083 CXXRecordDecl *Class 6084 = cast_or_null<CXXRecordDecl>(VTableUses[I].first)->getDefinition(); 6085 if (!Class) 6086 continue; 6087 6088 SourceLocation Loc = VTableUses[I].second; 6089 6090 // If this class has a key function, but that key function is 6091 // defined in another translation unit, we don't need to emit the 6092 // vtable even though we're using it. 6093 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6094 if (KeyFunction && !KeyFunction->getBody()) { 6095 switch (KeyFunction->getTemplateSpecializationKind()) { 6096 case TSK_Undeclared: 6097 case TSK_ExplicitSpecialization: 6098 case TSK_ExplicitInstantiationDeclaration: 6099 // The key function is in another translation unit. 6100 continue; 6101 6102 case TSK_ExplicitInstantiationDefinition: 6103 case TSK_ImplicitInstantiation: 6104 // We will be instantiating the key function. 6105 break; 6106 } 6107 } else if (!KeyFunction) { 6108 // If we have a class with no key function that is the subject 6109 // of an explicit instantiation declaration, suppress the 6110 // vtable; it will live with the explicit instantiation 6111 // definition. 6112 bool IsExplicitInstantiationDeclaration 6113 = Class->getTemplateSpecializationKind() 6114 == TSK_ExplicitInstantiationDeclaration; 6115 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6116 REnd = Class->redecls_end(); 6117 R != REnd; ++R) { 6118 TemplateSpecializationKind TSK 6119 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6120 if (TSK == TSK_ExplicitInstantiationDeclaration) 6121 IsExplicitInstantiationDeclaration = true; 6122 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6123 IsExplicitInstantiationDeclaration = false; 6124 break; 6125 } 6126 } 6127 6128 if (IsExplicitInstantiationDeclaration) 6129 continue; 6130 } 6131 6132 // Mark all of the virtual members of this class as referenced, so 6133 // that we can build a vtable. Then, tell the AST consumer that a 6134 // vtable for this class is required. 6135 MarkVirtualMembersReferenced(Loc, Class); 6136 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6137 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6138 6139 // Optionally warn if we're emitting a weak vtable. 6140 if (Class->getLinkage() == ExternalLinkage && 6141 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6142 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6143 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6144 } 6145 } 6146 VTableUses.clear(); 6147 6148 return true; 6149} 6150 6151void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6152 const CXXRecordDecl *RD) { 6153 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6154 e = RD->method_end(); i != e; ++i) { 6155 CXXMethodDecl *MD = *i; 6156 6157 // C++ [basic.def.odr]p2: 6158 // [...] A virtual member function is used if it is not pure. [...] 6159 if (MD->isVirtual() && !MD->isPure()) 6160 MarkDeclarationReferenced(Loc, MD); 6161 } 6162 6163 // Only classes that have virtual bases need a VTT. 6164 if (RD->getNumVBases() == 0) 6165 return; 6166 6167 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6168 e = RD->bases_end(); i != e; ++i) { 6169 const CXXRecordDecl *Base = 6170 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6171 if (i->isVirtual()) 6172 continue; 6173 if (Base->getNumVBases() == 0) 6174 continue; 6175 MarkVirtualMembersReferenced(Loc, Base); 6176 } 6177} 6178 6179/// SetIvarInitializers - This routine builds initialization ASTs for the 6180/// Objective-C implementation whose ivars need be initialized. 6181void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6182 if (!getLangOptions().CPlusPlus) 6183 return; 6184 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6185 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6186 CollectIvarsToConstructOrDestruct(OID, ivars); 6187 if (ivars.empty()) 6188 return; 6189 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6190 for (unsigned i = 0; i < ivars.size(); i++) { 6191 FieldDecl *Field = ivars[i]; 6192 CXXBaseOrMemberInitializer *Member; 6193 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6194 InitializationKind InitKind = 6195 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6196 6197 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6198 Sema::OwningExprResult MemberInit = 6199 InitSeq.Perform(*this, InitEntity, InitKind, 6200 Sema::MultiExprArg(*this, 0, 0)); 6201 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6202 // Note, MemberInit could actually come back empty if no initialization 6203 // is required (e.g., because it would call a trivial default constructor) 6204 if (!MemberInit.get() || MemberInit.isInvalid()) 6205 continue; 6206 6207 Member = 6208 new (Context) CXXBaseOrMemberInitializer(Context, 6209 Field, SourceLocation(), 6210 SourceLocation(), 6211 MemberInit.takeAs<Expr>(), 6212 SourceLocation()); 6213 AllToInit.push_back(Member); 6214 } 6215 ObjCImplementation->setIvarInitializers(Context, 6216 AllToInit.data(), AllToInit.size()); 6217 } 6218} 6219