SemaDeclCXX.cpp revision 4a0c26f57ffe685dfc795f04eaef9b805997b65e
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 if (!Class->hasObjectMember()) { 626 if (const RecordType *FDTTy = 627 NewBaseType.getTypePtr()->getAs<RecordType>()) 628 if (FDTTy->getDecl()->hasObjectMember()) 629 Class->setHasObjectMember(true); 630 } 631 632 if (KnownBaseTypes[NewBaseType]) { 633 // C++ [class.mi]p3: 634 // A class shall not be specified as a direct base class of a 635 // derived class more than once. 636 Diag(Bases[idx]->getSourceRange().getBegin(), 637 diag::err_duplicate_base_class) 638 << KnownBaseTypes[NewBaseType]->getType() 639 << Bases[idx]->getSourceRange(); 640 641 // Delete the duplicate base class specifier; we're going to 642 // overwrite its pointer later. 643 Context.Deallocate(Bases[idx]); 644 645 Invalid = true; 646 } else { 647 // Okay, add this new base class. 648 KnownBaseTypes[NewBaseType] = Bases[idx]; 649 Bases[NumGoodBases++] = Bases[idx]; 650 } 651 } 652 653 // Attach the remaining base class specifiers to the derived class. 654 Class->setBases(Bases, NumGoodBases); 655 656 // Delete the remaining (good) base class specifiers, since their 657 // data has been copied into the CXXRecordDecl. 658 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 659 Context.Deallocate(Bases[idx]); 660 661 return Invalid; 662} 663 664/// ActOnBaseSpecifiers - Attach the given base specifiers to the 665/// class, after checking whether there are any duplicate base 666/// classes. 667void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 668 unsigned NumBases) { 669 if (!ClassDecl || !Bases || !NumBases) 670 return; 671 672 AdjustDeclIfTemplate(ClassDecl); 673 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 674 (CXXBaseSpecifier**)(Bases), NumBases); 675} 676 677static CXXRecordDecl *GetClassForType(QualType T) { 678 if (const RecordType *RT = T->getAs<RecordType>()) 679 return cast<CXXRecordDecl>(RT->getDecl()); 680 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 681 return ICT->getDecl(); 682 else 683 return 0; 684} 685 686/// \brief Determine whether the type \p Derived is a C++ class that is 687/// derived from the type \p Base. 688bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 689 if (!getLangOptions().CPlusPlus) 690 return false; 691 692 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 693 if (!DerivedRD) 694 return false; 695 696 CXXRecordDecl *BaseRD = GetClassForType(Base); 697 if (!BaseRD) 698 return false; 699 700 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 701 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 702} 703 704/// \brief Determine whether the type \p Derived is a C++ class that is 705/// derived from the type \p Base. 706bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 707 if (!getLangOptions().CPlusPlus) 708 return false; 709 710 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 711 if (!DerivedRD) 712 return false; 713 714 CXXRecordDecl *BaseRD = GetClassForType(Base); 715 if (!BaseRD) 716 return false; 717 718 return DerivedRD->isDerivedFrom(BaseRD, Paths); 719} 720 721void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 722 CXXBaseSpecifierArray &BasePathArray) { 723 assert(BasePathArray.empty() && "Base path array must be empty!"); 724 assert(Paths.isRecordingPaths() && "Must record paths!"); 725 726 const CXXBasePath &Path = Paths.front(); 727 728 // We first go backward and check if we have a virtual base. 729 // FIXME: It would be better if CXXBasePath had the base specifier for 730 // the nearest virtual base. 731 unsigned Start = 0; 732 for (unsigned I = Path.size(); I != 0; --I) { 733 if (Path[I - 1].Base->isVirtual()) { 734 Start = I - 1; 735 break; 736 } 737 } 738 739 // Now add all bases. 740 for (unsigned I = Start, E = Path.size(); I != E; ++I) 741 BasePathArray.push_back(Path[I].Base); 742} 743 744/// \brief Determine whether the given base path includes a virtual 745/// base class. 746bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 747 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 748 BEnd = BasePath.end(); 749 B != BEnd; ++B) 750 if ((*B)->isVirtual()) 751 return true; 752 753 return false; 754} 755 756/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 757/// conversion (where Derived and Base are class types) is 758/// well-formed, meaning that the conversion is unambiguous (and 759/// that all of the base classes are accessible). Returns true 760/// and emits a diagnostic if the code is ill-formed, returns false 761/// otherwise. Loc is the location where this routine should point to 762/// if there is an error, and Range is the source range to highlight 763/// if there is an error. 764bool 765Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 766 unsigned InaccessibleBaseID, 767 unsigned AmbigiousBaseConvID, 768 SourceLocation Loc, SourceRange Range, 769 DeclarationName Name, 770 CXXBaseSpecifierArray *BasePath) { 771 // First, determine whether the path from Derived to Base is 772 // ambiguous. This is slightly more expensive than checking whether 773 // the Derived to Base conversion exists, because here we need to 774 // explore multiple paths to determine if there is an ambiguity. 775 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 776 /*DetectVirtual=*/false); 777 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 778 assert(DerivationOkay && 779 "Can only be used with a derived-to-base conversion"); 780 (void)DerivationOkay; 781 782 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 783 if (InaccessibleBaseID) { 784 // Check that the base class can be accessed. 785 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 786 InaccessibleBaseID)) { 787 case AR_inaccessible: 788 return true; 789 case AR_accessible: 790 case AR_dependent: 791 case AR_delayed: 792 break; 793 } 794 } 795 796 // Build a base path if necessary. 797 if (BasePath) 798 BuildBasePathArray(Paths, *BasePath); 799 return false; 800 } 801 802 // We know that the derived-to-base conversion is ambiguous, and 803 // we're going to produce a diagnostic. Perform the derived-to-base 804 // search just one more time to compute all of the possible paths so 805 // that we can print them out. This is more expensive than any of 806 // the previous derived-to-base checks we've done, but at this point 807 // performance isn't as much of an issue. 808 Paths.clear(); 809 Paths.setRecordingPaths(true); 810 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 811 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 812 (void)StillOkay; 813 814 // Build up a textual representation of the ambiguous paths, e.g., 815 // D -> B -> A, that will be used to illustrate the ambiguous 816 // conversions in the diagnostic. We only print one of the paths 817 // to each base class subobject. 818 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 819 820 Diag(Loc, AmbigiousBaseConvID) 821 << Derived << Base << PathDisplayStr << Range << Name; 822 return true; 823} 824 825bool 826Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 827 SourceLocation Loc, SourceRange Range, 828 CXXBaseSpecifierArray *BasePath, 829 bool IgnoreAccess) { 830 return CheckDerivedToBaseConversion(Derived, Base, 831 IgnoreAccess ? 0 832 : diag::err_upcast_to_inaccessible_base, 833 diag::err_ambiguous_derived_to_base_conv, 834 Loc, Range, DeclarationName(), 835 BasePath); 836} 837 838 839/// @brief Builds a string representing ambiguous paths from a 840/// specific derived class to different subobjects of the same base 841/// class. 842/// 843/// This function builds a string that can be used in error messages 844/// to show the different paths that one can take through the 845/// inheritance hierarchy to go from the derived class to different 846/// subobjects of a base class. The result looks something like this: 847/// @code 848/// struct D -> struct B -> struct A 849/// struct D -> struct C -> struct A 850/// @endcode 851std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 852 std::string PathDisplayStr; 853 std::set<unsigned> DisplayedPaths; 854 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 855 Path != Paths.end(); ++Path) { 856 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 857 // We haven't displayed a path to this particular base 858 // class subobject yet. 859 PathDisplayStr += "\n "; 860 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 861 for (CXXBasePath::const_iterator Element = Path->begin(); 862 Element != Path->end(); ++Element) 863 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 864 } 865 } 866 867 return PathDisplayStr; 868} 869 870//===----------------------------------------------------------------------===// 871// C++ class member Handling 872//===----------------------------------------------------------------------===// 873 874/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 875Sema::DeclPtrTy 876Sema::ActOnAccessSpecifier(AccessSpecifier Access, 877 SourceLocation ASLoc, SourceLocation ColonLoc) { 878 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 879 AccessSpecDecl* ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 880 ASLoc, ColonLoc); 881 CurContext->addHiddenDecl(ASDecl); 882 return DeclPtrTy::make(ASDecl); 883} 884 885/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 886/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 887/// bitfield width if there is one and 'InitExpr' specifies the initializer if 888/// any. 889Sema::DeclPtrTy 890Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 891 MultiTemplateParamsArg TemplateParameterLists, 892 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 893 bool Deleted) { 894 const DeclSpec &DS = D.getDeclSpec(); 895 DeclarationName Name = GetNameForDeclarator(D); 896 Expr *BitWidth = static_cast<Expr*>(BW); 897 Expr *Init = static_cast<Expr*>(InitExpr); 898 SourceLocation Loc = D.getIdentifierLoc(); 899 900 assert(isa<CXXRecordDecl>(CurContext)); 901 assert(!DS.isFriendSpecified()); 902 903 bool isFunc = false; 904 if (D.isFunctionDeclarator()) 905 isFunc = true; 906 else if (D.getNumTypeObjects() == 0 && 907 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 908 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 909 isFunc = TDType->isFunctionType(); 910 } 911 912 // C++ 9.2p6: A member shall not be declared to have automatic storage 913 // duration (auto, register) or with the extern storage-class-specifier. 914 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 915 // data members and cannot be applied to names declared const or static, 916 // and cannot be applied to reference members. 917 switch (DS.getStorageClassSpec()) { 918 case DeclSpec::SCS_unspecified: 919 case DeclSpec::SCS_typedef: 920 case DeclSpec::SCS_static: 921 // FALL THROUGH. 922 break; 923 case DeclSpec::SCS_mutable: 924 if (isFunc) { 925 if (DS.getStorageClassSpecLoc().isValid()) 926 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 927 else 928 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 929 930 // FIXME: It would be nicer if the keyword was ignored only for this 931 // declarator. Otherwise we could get follow-up errors. 932 D.getMutableDeclSpec().ClearStorageClassSpecs(); 933 } 934 break; 935 default: 936 if (DS.getStorageClassSpecLoc().isValid()) 937 Diag(DS.getStorageClassSpecLoc(), 938 diag::err_storageclass_invalid_for_member); 939 else 940 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 941 D.getMutableDeclSpec().ClearStorageClassSpecs(); 942 } 943 944 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 945 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 946 !isFunc); 947 948 Decl *Member; 949 if (isInstField) { 950 // FIXME: Check for template parameters! 951 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 952 AS); 953 assert(Member && "HandleField never returns null"); 954 } else { 955 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 956 .getAs<Decl>(); 957 if (!Member) { 958 if (BitWidth) DeleteExpr(BitWidth); 959 return DeclPtrTy(); 960 } 961 962 // Non-instance-fields can't have a bitfield. 963 if (BitWidth) { 964 if (Member->isInvalidDecl()) { 965 // don't emit another diagnostic. 966 } else if (isa<VarDecl>(Member)) { 967 // C++ 9.6p3: A bit-field shall not be a static member. 968 // "static member 'A' cannot be a bit-field" 969 Diag(Loc, diag::err_static_not_bitfield) 970 << Name << BitWidth->getSourceRange(); 971 } else if (isa<TypedefDecl>(Member)) { 972 // "typedef member 'x' cannot be a bit-field" 973 Diag(Loc, diag::err_typedef_not_bitfield) 974 << Name << BitWidth->getSourceRange(); 975 } else { 976 // A function typedef ("typedef int f(); f a;"). 977 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 978 Diag(Loc, diag::err_not_integral_type_bitfield) 979 << Name << cast<ValueDecl>(Member)->getType() 980 << BitWidth->getSourceRange(); 981 } 982 983 DeleteExpr(BitWidth); 984 BitWidth = 0; 985 Member->setInvalidDecl(); 986 } 987 988 Member->setAccess(AS); 989 990 // If we have declared a member function template, set the access of the 991 // templated declaration as well. 992 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 993 FunTmpl->getTemplatedDecl()->setAccess(AS); 994 } 995 996 assert((Name || isInstField) && "No identifier for non-field ?"); 997 998 if (Init) 999 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1000 if (Deleted) // FIXME: Source location is not very good. 1001 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1002 1003 if (isInstField) { 1004 FieldCollector->Add(cast<FieldDecl>(Member)); 1005 return DeclPtrTy(); 1006 } 1007 return DeclPtrTy::make(Member); 1008} 1009 1010/// \brief Find the direct and/or virtual base specifiers that 1011/// correspond to the given base type, for use in base initialization 1012/// within a constructor. 1013static bool FindBaseInitializer(Sema &SemaRef, 1014 CXXRecordDecl *ClassDecl, 1015 QualType BaseType, 1016 const CXXBaseSpecifier *&DirectBaseSpec, 1017 const CXXBaseSpecifier *&VirtualBaseSpec) { 1018 // First, check for a direct base class. 1019 DirectBaseSpec = 0; 1020 for (CXXRecordDecl::base_class_const_iterator Base 1021 = ClassDecl->bases_begin(); 1022 Base != ClassDecl->bases_end(); ++Base) { 1023 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1024 // We found a direct base of this type. That's what we're 1025 // initializing. 1026 DirectBaseSpec = &*Base; 1027 break; 1028 } 1029 } 1030 1031 // Check for a virtual base class. 1032 // FIXME: We might be able to short-circuit this if we know in advance that 1033 // there are no virtual bases. 1034 VirtualBaseSpec = 0; 1035 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1036 // We haven't found a base yet; search the class hierarchy for a 1037 // virtual base class. 1038 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1039 /*DetectVirtual=*/false); 1040 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1041 BaseType, Paths)) { 1042 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1043 Path != Paths.end(); ++Path) { 1044 if (Path->back().Base->isVirtual()) { 1045 VirtualBaseSpec = Path->back().Base; 1046 break; 1047 } 1048 } 1049 } 1050 } 1051 1052 return DirectBaseSpec || VirtualBaseSpec; 1053} 1054 1055/// ActOnMemInitializer - Handle a C++ member initializer. 1056Sema::MemInitResult 1057Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1058 Scope *S, 1059 CXXScopeSpec &SS, 1060 IdentifierInfo *MemberOrBase, 1061 TypeTy *TemplateTypeTy, 1062 SourceLocation IdLoc, 1063 SourceLocation LParenLoc, 1064 ExprTy **Args, unsigned NumArgs, 1065 SourceLocation *CommaLocs, 1066 SourceLocation RParenLoc) { 1067 if (!ConstructorD) 1068 return true; 1069 1070 AdjustDeclIfTemplate(ConstructorD); 1071 1072 CXXConstructorDecl *Constructor 1073 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1074 if (!Constructor) { 1075 // The user wrote a constructor initializer on a function that is 1076 // not a C++ constructor. Ignore the error for now, because we may 1077 // have more member initializers coming; we'll diagnose it just 1078 // once in ActOnMemInitializers. 1079 return true; 1080 } 1081 1082 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1083 1084 // C++ [class.base.init]p2: 1085 // Names in a mem-initializer-id are looked up in the scope of the 1086 // constructor’s class and, if not found in that scope, are looked 1087 // up in the scope containing the constructor’s 1088 // definition. [Note: if the constructor’s class contains a member 1089 // with the same name as a direct or virtual base class of the 1090 // class, a mem-initializer-id naming the member or base class and 1091 // composed of a single identifier refers to the class member. A 1092 // mem-initializer-id for the hidden base class may be specified 1093 // using a qualified name. ] 1094 if (!SS.getScopeRep() && !TemplateTypeTy) { 1095 // Look for a member, first. 1096 FieldDecl *Member = 0; 1097 DeclContext::lookup_result Result 1098 = ClassDecl->lookup(MemberOrBase); 1099 if (Result.first != Result.second) 1100 Member = dyn_cast<FieldDecl>(*Result.first); 1101 1102 // FIXME: Handle members of an anonymous union. 1103 1104 if (Member) 1105 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1106 LParenLoc, RParenLoc); 1107 } 1108 // It didn't name a member, so see if it names a class. 1109 QualType BaseType; 1110 TypeSourceInfo *TInfo = 0; 1111 1112 if (TemplateTypeTy) { 1113 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1114 } else { 1115 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1116 LookupParsedName(R, S, &SS); 1117 1118 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1119 if (!TyD) { 1120 if (R.isAmbiguous()) return true; 1121 1122 // We don't want access-control diagnostics here. 1123 R.suppressDiagnostics(); 1124 1125 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1126 bool NotUnknownSpecialization = false; 1127 DeclContext *DC = computeDeclContext(SS, false); 1128 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1129 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1130 1131 if (!NotUnknownSpecialization) { 1132 // When the scope specifier can refer to a member of an unknown 1133 // specialization, we take it as a type name. 1134 BaseType = CheckTypenameType(ETK_None, 1135 (NestedNameSpecifier *)SS.getScopeRep(), 1136 *MemberOrBase, SourceLocation(), 1137 SS.getRange(), IdLoc); 1138 if (BaseType.isNull()) 1139 return true; 1140 1141 R.clear(); 1142 R.setLookupName(MemberOrBase); 1143 } 1144 } 1145 1146 // If no results were found, try to correct typos. 1147 if (R.empty() && BaseType.isNull() && 1148 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1149 R.isSingleResult()) { 1150 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1151 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1152 // We have found a non-static data member with a similar 1153 // name to what was typed; complain and initialize that 1154 // member. 1155 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1156 << MemberOrBase << true << R.getLookupName() 1157 << FixItHint::CreateReplacement(R.getNameLoc(), 1158 R.getLookupName().getAsString()); 1159 Diag(Member->getLocation(), diag::note_previous_decl) 1160 << Member->getDeclName(); 1161 1162 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1163 LParenLoc, RParenLoc); 1164 } 1165 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1166 const CXXBaseSpecifier *DirectBaseSpec; 1167 const CXXBaseSpecifier *VirtualBaseSpec; 1168 if (FindBaseInitializer(*this, ClassDecl, 1169 Context.getTypeDeclType(Type), 1170 DirectBaseSpec, VirtualBaseSpec)) { 1171 // We have found a direct or virtual base class with a 1172 // similar name to what was typed; complain and initialize 1173 // that base class. 1174 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1175 << MemberOrBase << false << R.getLookupName() 1176 << FixItHint::CreateReplacement(R.getNameLoc(), 1177 R.getLookupName().getAsString()); 1178 1179 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1180 : VirtualBaseSpec; 1181 Diag(BaseSpec->getSourceRange().getBegin(), 1182 diag::note_base_class_specified_here) 1183 << BaseSpec->getType() 1184 << BaseSpec->getSourceRange(); 1185 1186 TyD = Type; 1187 } 1188 } 1189 } 1190 1191 if (!TyD && BaseType.isNull()) { 1192 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1193 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1194 return true; 1195 } 1196 } 1197 1198 if (BaseType.isNull()) { 1199 BaseType = Context.getTypeDeclType(TyD); 1200 if (SS.isSet()) { 1201 NestedNameSpecifier *Qualifier = 1202 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1203 1204 // FIXME: preserve source range information 1205 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1206 } 1207 } 1208 } 1209 1210 if (!TInfo) 1211 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1212 1213 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1214 LParenLoc, RParenLoc, ClassDecl); 1215} 1216 1217/// Checks an initializer expression for use of uninitialized fields, such as 1218/// containing the field that is being initialized. Returns true if there is an 1219/// uninitialized field was used an updates the SourceLocation parameter; false 1220/// otherwise. 1221static bool InitExprContainsUninitializedFields(const Stmt *S, 1222 const FieldDecl *LhsField, 1223 SourceLocation *L) { 1224 if (isa<CallExpr>(S)) { 1225 // Do not descend into function calls or constructors, as the use 1226 // of an uninitialized field may be valid. One would have to inspect 1227 // the contents of the function/ctor to determine if it is safe or not. 1228 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1229 // may be safe, depending on what the function/ctor does. 1230 return false; 1231 } 1232 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1233 const NamedDecl *RhsField = ME->getMemberDecl(); 1234 if (RhsField == LhsField) { 1235 // Initializing a field with itself. Throw a warning. 1236 // But wait; there are exceptions! 1237 // Exception #1: The field may not belong to this record. 1238 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1239 const Expr *base = ME->getBase(); 1240 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1241 // Even though the field matches, it does not belong to this record. 1242 return false; 1243 } 1244 // None of the exceptions triggered; return true to indicate an 1245 // uninitialized field was used. 1246 *L = ME->getMemberLoc(); 1247 return true; 1248 } 1249 } 1250 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1251 it != e; ++it) { 1252 if (!*it) { 1253 // An expression such as 'member(arg ?: "")' may trigger this. 1254 continue; 1255 } 1256 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1257 return true; 1258 } 1259 return false; 1260} 1261 1262Sema::MemInitResult 1263Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1264 unsigned NumArgs, SourceLocation IdLoc, 1265 SourceLocation LParenLoc, 1266 SourceLocation RParenLoc) { 1267 // Diagnose value-uses of fields to initialize themselves, e.g. 1268 // foo(foo) 1269 // where foo is not also a parameter to the constructor. 1270 // TODO: implement -Wuninitialized and fold this into that framework. 1271 for (unsigned i = 0; i < NumArgs; ++i) { 1272 SourceLocation L; 1273 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1274 // FIXME: Return true in the case when other fields are used before being 1275 // uninitialized. For example, let this field be the i'th field. When 1276 // initializing the i'th field, throw a warning if any of the >= i'th 1277 // fields are used, as they are not yet initialized. 1278 // Right now we are only handling the case where the i'th field uses 1279 // itself in its initializer. 1280 Diag(L, diag::warn_field_is_uninit); 1281 } 1282 } 1283 1284 bool HasDependentArg = false; 1285 for (unsigned i = 0; i < NumArgs; i++) 1286 HasDependentArg |= Args[i]->isTypeDependent(); 1287 1288 QualType FieldType = Member->getType(); 1289 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1290 FieldType = Array->getElementType(); 1291 if (FieldType->isDependentType() || HasDependentArg) { 1292 // Can't check initialization for a member of dependent type or when 1293 // any of the arguments are type-dependent expressions. 1294 OwningExprResult Init 1295 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1296 RParenLoc)); 1297 1298 // Erase any temporaries within this evaluation context; we're not 1299 // going to track them in the AST, since we'll be rebuilding the 1300 // ASTs during template instantiation. 1301 ExprTemporaries.erase( 1302 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1303 ExprTemporaries.end()); 1304 1305 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1306 LParenLoc, 1307 Init.takeAs<Expr>(), 1308 RParenLoc); 1309 1310 } 1311 1312 if (Member->isInvalidDecl()) 1313 return true; 1314 1315 // Initialize the member. 1316 InitializedEntity MemberEntity = 1317 InitializedEntity::InitializeMember(Member, 0); 1318 InitializationKind Kind = 1319 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1320 1321 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1322 1323 OwningExprResult MemberInit = 1324 InitSeq.Perform(*this, MemberEntity, Kind, 1325 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1326 if (MemberInit.isInvalid()) 1327 return true; 1328 1329 // C++0x [class.base.init]p7: 1330 // The initialization of each base and member constitutes a 1331 // full-expression. 1332 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1333 if (MemberInit.isInvalid()) 1334 return true; 1335 1336 // If we are in a dependent context, template instantiation will 1337 // perform this type-checking again. Just save the arguments that we 1338 // received in a ParenListExpr. 1339 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1340 // of the information that we have about the member 1341 // initializer. However, deconstructing the ASTs is a dicey process, 1342 // and this approach is far more likely to get the corner cases right. 1343 if (CurContext->isDependentContext()) { 1344 // Bump the reference count of all of the arguments. 1345 for (unsigned I = 0; I != NumArgs; ++I) 1346 Args[I]->Retain(); 1347 1348 OwningExprResult Init 1349 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1350 RParenLoc)); 1351 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1352 LParenLoc, 1353 Init.takeAs<Expr>(), 1354 RParenLoc); 1355 } 1356 1357 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1358 LParenLoc, 1359 MemberInit.takeAs<Expr>(), 1360 RParenLoc); 1361} 1362 1363Sema::MemInitResult 1364Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1365 Expr **Args, unsigned NumArgs, 1366 SourceLocation LParenLoc, SourceLocation RParenLoc, 1367 CXXRecordDecl *ClassDecl) { 1368 bool HasDependentArg = false; 1369 for (unsigned i = 0; i < NumArgs; i++) 1370 HasDependentArg |= Args[i]->isTypeDependent(); 1371 1372 SourceLocation BaseLoc 1373 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1374 1375 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1376 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1377 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1378 1379 // C++ [class.base.init]p2: 1380 // [...] Unless the mem-initializer-id names a nonstatic data 1381 // member of the constructor’s class or a direct or virtual base 1382 // of that class, the mem-initializer is ill-formed. A 1383 // mem-initializer-list can initialize a base class using any 1384 // name that denotes that base class type. 1385 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1386 1387 // Check for direct and virtual base classes. 1388 const CXXBaseSpecifier *DirectBaseSpec = 0; 1389 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1390 if (!Dependent) { 1391 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1392 VirtualBaseSpec); 1393 1394 // C++ [base.class.init]p2: 1395 // Unless the mem-initializer-id names a nonstatic data member of the 1396 // constructor's class or a direct or virtual base of that class, the 1397 // mem-initializer is ill-formed. 1398 if (!DirectBaseSpec && !VirtualBaseSpec) { 1399 // If the class has any dependent bases, then it's possible that 1400 // one of those types will resolve to the same type as 1401 // BaseType. Therefore, just treat this as a dependent base 1402 // class initialization. FIXME: Should we try to check the 1403 // initialization anyway? It seems odd. 1404 if (ClassDecl->hasAnyDependentBases()) 1405 Dependent = true; 1406 else 1407 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1408 << BaseType << Context.getTypeDeclType(ClassDecl) 1409 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1410 } 1411 } 1412 1413 if (Dependent) { 1414 // Can't check initialization for a base of dependent type or when 1415 // any of the arguments are type-dependent expressions. 1416 OwningExprResult BaseInit 1417 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1418 RParenLoc)); 1419 1420 // Erase any temporaries within this evaluation context; we're not 1421 // going to track them in the AST, since we'll be rebuilding the 1422 // ASTs during template instantiation. 1423 ExprTemporaries.erase( 1424 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1425 ExprTemporaries.end()); 1426 1427 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1428 /*IsVirtual=*/false, 1429 LParenLoc, 1430 BaseInit.takeAs<Expr>(), 1431 RParenLoc); 1432 } 1433 1434 // C++ [base.class.init]p2: 1435 // If a mem-initializer-id is ambiguous because it designates both 1436 // a direct non-virtual base class and an inherited virtual base 1437 // class, the mem-initializer is ill-formed. 1438 if (DirectBaseSpec && VirtualBaseSpec) 1439 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1440 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1441 1442 CXXBaseSpecifier *BaseSpec 1443 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1444 if (!BaseSpec) 1445 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1446 1447 // Initialize the base. 1448 InitializedEntity BaseEntity = 1449 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1450 InitializationKind Kind = 1451 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1452 1453 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1454 1455 OwningExprResult BaseInit = 1456 InitSeq.Perform(*this, BaseEntity, Kind, 1457 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1458 if (BaseInit.isInvalid()) 1459 return true; 1460 1461 // C++0x [class.base.init]p7: 1462 // The initialization of each base and member constitutes a 1463 // full-expression. 1464 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1465 if (BaseInit.isInvalid()) 1466 return true; 1467 1468 // If we are in a dependent context, template instantiation will 1469 // perform this type-checking again. Just save the arguments that we 1470 // received in a ParenListExpr. 1471 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1472 // of the information that we have about the base 1473 // initializer. However, deconstructing the ASTs is a dicey process, 1474 // and this approach is far more likely to get the corner cases right. 1475 if (CurContext->isDependentContext()) { 1476 // Bump the reference count of all of the arguments. 1477 for (unsigned I = 0; I != NumArgs; ++I) 1478 Args[I]->Retain(); 1479 1480 OwningExprResult Init 1481 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1482 RParenLoc)); 1483 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1484 BaseSpec->isVirtual(), 1485 LParenLoc, 1486 Init.takeAs<Expr>(), 1487 RParenLoc); 1488 } 1489 1490 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1491 BaseSpec->isVirtual(), 1492 LParenLoc, 1493 BaseInit.takeAs<Expr>(), 1494 RParenLoc); 1495} 1496 1497/// ImplicitInitializerKind - How an implicit base or member initializer should 1498/// initialize its base or member. 1499enum ImplicitInitializerKind { 1500 IIK_Default, 1501 IIK_Copy, 1502 IIK_Move 1503}; 1504 1505static bool 1506BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1507 ImplicitInitializerKind ImplicitInitKind, 1508 CXXBaseSpecifier *BaseSpec, 1509 bool IsInheritedVirtualBase, 1510 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1511 InitializedEntity InitEntity 1512 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1513 IsInheritedVirtualBase); 1514 1515 Sema::OwningExprResult BaseInit(SemaRef); 1516 1517 switch (ImplicitInitKind) { 1518 case IIK_Default: { 1519 InitializationKind InitKind 1520 = InitializationKind::CreateDefault(Constructor->getLocation()); 1521 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1522 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1523 Sema::MultiExprArg(SemaRef, 0, 0)); 1524 break; 1525 } 1526 1527 case IIK_Copy: { 1528 ParmVarDecl *Param = Constructor->getParamDecl(0); 1529 QualType ParamType = Param->getType().getNonReferenceType(); 1530 1531 Expr *CopyCtorArg = 1532 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1533 Constructor->getLocation(), ParamType, 0); 1534 1535 // Cast to the base class to avoid ambiguities. 1536 QualType ArgTy = 1537 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1538 ParamType.getQualifiers()); 1539 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1540 CastExpr::CK_UncheckedDerivedToBase, 1541 /*isLvalue=*/true, 1542 CXXBaseSpecifierArray(BaseSpec)); 1543 1544 InitializationKind InitKind 1545 = InitializationKind::CreateDirect(Constructor->getLocation(), 1546 SourceLocation(), SourceLocation()); 1547 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1548 &CopyCtorArg, 1); 1549 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1550 Sema::MultiExprArg(SemaRef, 1551 (void**)&CopyCtorArg, 1)); 1552 break; 1553 } 1554 1555 case IIK_Move: 1556 assert(false && "Unhandled initializer kind!"); 1557 } 1558 1559 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1560 if (BaseInit.isInvalid()) 1561 return true; 1562 1563 CXXBaseInit = 1564 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1565 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1566 SourceLocation()), 1567 BaseSpec->isVirtual(), 1568 SourceLocation(), 1569 BaseInit.takeAs<Expr>(), 1570 SourceLocation()); 1571 1572 return false; 1573} 1574 1575static bool 1576BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1577 ImplicitInitializerKind ImplicitInitKind, 1578 FieldDecl *Field, 1579 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1580 if (Field->isInvalidDecl()) 1581 return true; 1582 1583 SourceLocation Loc = Constructor->getLocation(); 1584 1585 if (ImplicitInitKind == IIK_Copy) { 1586 ParmVarDecl *Param = Constructor->getParamDecl(0); 1587 QualType ParamType = Param->getType().getNonReferenceType(); 1588 1589 Expr *MemberExprBase = 1590 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1591 Loc, ParamType, 0); 1592 1593 // Build a reference to this field within the parameter. 1594 CXXScopeSpec SS; 1595 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1596 Sema::LookupMemberName); 1597 MemberLookup.addDecl(Field, AS_public); 1598 MemberLookup.resolveKind(); 1599 Sema::OwningExprResult CopyCtorArg 1600 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1601 ParamType, Loc, 1602 /*IsArrow=*/false, 1603 SS, 1604 /*FirstQualifierInScope=*/0, 1605 MemberLookup, 1606 /*TemplateArgs=*/0); 1607 if (CopyCtorArg.isInvalid()) 1608 return true; 1609 1610 // When the field we are copying is an array, create index variables for 1611 // each dimension of the array. We use these index variables to subscript 1612 // the source array, and other clients (e.g., CodeGen) will perform the 1613 // necessary iteration with these index variables. 1614 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1615 QualType BaseType = Field->getType(); 1616 QualType SizeType = SemaRef.Context.getSizeType(); 1617 while (const ConstantArrayType *Array 1618 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1619 // Create the iteration variable for this array index. 1620 IdentifierInfo *IterationVarName = 0; 1621 { 1622 llvm::SmallString<8> Str; 1623 llvm::raw_svector_ostream OS(Str); 1624 OS << "__i" << IndexVariables.size(); 1625 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1626 } 1627 VarDecl *IterationVar 1628 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1629 IterationVarName, SizeType, 1630 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1631 VarDecl::None, VarDecl::None); 1632 IndexVariables.push_back(IterationVar); 1633 1634 // Create a reference to the iteration variable. 1635 Sema::OwningExprResult IterationVarRef 1636 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1637 assert(!IterationVarRef.isInvalid() && 1638 "Reference to invented variable cannot fail!"); 1639 1640 // Subscript the array with this iteration variable. 1641 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1642 Loc, 1643 move(IterationVarRef), 1644 Loc); 1645 if (CopyCtorArg.isInvalid()) 1646 return true; 1647 1648 BaseType = Array->getElementType(); 1649 } 1650 1651 // Construct the entity that we will be initializing. For an array, this 1652 // will be first element in the array, which may require several levels 1653 // of array-subscript entities. 1654 llvm::SmallVector<InitializedEntity, 4> Entities; 1655 Entities.reserve(1 + IndexVariables.size()); 1656 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1657 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1658 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1659 0, 1660 Entities.back())); 1661 1662 // Direct-initialize to use the copy constructor. 1663 InitializationKind InitKind = 1664 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1665 1666 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1667 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1668 &CopyCtorArgE, 1); 1669 1670 Sema::OwningExprResult MemberInit 1671 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1672 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1673 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1674 if (MemberInit.isInvalid()) 1675 return true; 1676 1677 CXXMemberInit 1678 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1679 MemberInit.takeAs<Expr>(), Loc, 1680 IndexVariables.data(), 1681 IndexVariables.size()); 1682 return false; 1683 } 1684 1685 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1686 1687 QualType FieldBaseElementType = 1688 SemaRef.Context.getBaseElementType(Field->getType()); 1689 1690 if (FieldBaseElementType->isRecordType()) { 1691 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1692 InitializationKind InitKind = 1693 InitializationKind::CreateDefault(Loc); 1694 1695 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1696 Sema::OwningExprResult MemberInit = 1697 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1698 Sema::MultiExprArg(SemaRef, 0, 0)); 1699 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1700 if (MemberInit.isInvalid()) 1701 return true; 1702 1703 CXXMemberInit = 1704 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1705 Field, Loc, Loc, 1706 MemberInit.takeAs<Expr>(), 1707 Loc); 1708 return false; 1709 } 1710 1711 if (FieldBaseElementType->isReferenceType()) { 1712 SemaRef.Diag(Constructor->getLocation(), 1713 diag::err_uninitialized_member_in_ctor) 1714 << (int)Constructor->isImplicit() 1715 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1716 << 0 << Field->getDeclName(); 1717 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1718 return true; 1719 } 1720 1721 if (FieldBaseElementType.isConstQualified()) { 1722 SemaRef.Diag(Constructor->getLocation(), 1723 diag::err_uninitialized_member_in_ctor) 1724 << (int)Constructor->isImplicit() 1725 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1726 << 1 << Field->getDeclName(); 1727 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1728 return true; 1729 } 1730 1731 // Nothing to initialize. 1732 CXXMemberInit = 0; 1733 return false; 1734} 1735 1736namespace { 1737struct BaseAndFieldInfo { 1738 Sema &S; 1739 CXXConstructorDecl *Ctor; 1740 bool AnyErrorsInInits; 1741 ImplicitInitializerKind IIK; 1742 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1743 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1744 1745 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1746 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1747 // FIXME: Handle implicit move constructors. 1748 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1749 IIK = IIK_Copy; 1750 else 1751 IIK = IIK_Default; 1752 } 1753}; 1754} 1755 1756static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1757 FieldDecl *Top, FieldDecl *Field, 1758 CXXBaseOrMemberInitializer *Init) { 1759 // If the member doesn't need to be initialized, Init will still be null. 1760 if (!Init) 1761 return; 1762 1763 Info.AllToInit.push_back(Init); 1764 if (Field != Top) { 1765 Init->setMember(Top); 1766 Init->setAnonUnionMember(Field); 1767 } 1768} 1769 1770static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1771 FieldDecl *Top, FieldDecl *Field) { 1772 1773 // Overwhelmingly common case: we have a direct initializer for this field. 1774 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1775 RecordFieldInitializer(Info, Top, Field, Init); 1776 return false; 1777 } 1778 1779 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1780 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1781 assert(FieldClassType && "anonymous struct/union without record type"); 1782 CXXRecordDecl *FieldClassDecl 1783 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1784 1785 // Even though union members never have non-trivial default 1786 // constructions in C++03, we still build member initializers for aggregate 1787 // record types which can be union members, and C++0x allows non-trivial 1788 // default constructors for union members, so we ensure that only one 1789 // member is initialized for these. 1790 if (FieldClassDecl->isUnion()) { 1791 // First check for an explicit initializer for one field. 1792 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1793 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1794 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1795 RecordFieldInitializer(Info, Top, *FA, Init); 1796 1797 // Once we've initialized a field of an anonymous union, the union 1798 // field in the class is also initialized, so exit immediately. 1799 return false; 1800 } 1801 } 1802 1803 // Fallthrough and construct a default initializer for the union as 1804 // a whole, which can call its default constructor if such a thing exists 1805 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1806 // behavior going forward with C++0x, when anonymous unions there are 1807 // finalized, we should revisit this. 1808 } else { 1809 // For structs, we simply descend through to initialize all members where 1810 // necessary. 1811 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1812 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1813 if (CollectFieldInitializer(Info, Top, *FA)) 1814 return true; 1815 } 1816 } 1817 } 1818 1819 // Don't try to build an implicit initializer if there were semantic 1820 // errors in any of the initializers (and therefore we might be 1821 // missing some that the user actually wrote). 1822 if (Info.AnyErrorsInInits) 1823 return false; 1824 1825 CXXBaseOrMemberInitializer *Init = 0; 1826 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1827 return true; 1828 1829 RecordFieldInitializer(Info, Top, Field, Init); 1830 return false; 1831} 1832 1833bool 1834Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1835 CXXBaseOrMemberInitializer **Initializers, 1836 unsigned NumInitializers, 1837 bool AnyErrors) { 1838 if (Constructor->getDeclContext()->isDependentContext()) { 1839 // Just store the initializers as written, they will be checked during 1840 // instantiation. 1841 if (NumInitializers > 0) { 1842 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1843 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1844 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1845 memcpy(baseOrMemberInitializers, Initializers, 1846 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1847 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1848 } 1849 1850 return false; 1851 } 1852 1853 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1854 1855 // We need to build the initializer AST according to order of construction 1856 // and not what user specified in the Initializers list. 1857 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1858 if (!ClassDecl) 1859 return true; 1860 1861 bool HadError = false; 1862 1863 for (unsigned i = 0; i < NumInitializers; i++) { 1864 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1865 1866 if (Member->isBaseInitializer()) 1867 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1868 else 1869 Info.AllBaseFields[Member->getMember()] = Member; 1870 } 1871 1872 // Keep track of the direct virtual bases. 1873 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1874 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1875 E = ClassDecl->bases_end(); I != E; ++I) { 1876 if (I->isVirtual()) 1877 DirectVBases.insert(I); 1878 } 1879 1880 // Push virtual bases before others. 1881 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1882 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1883 1884 if (CXXBaseOrMemberInitializer *Value 1885 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1886 Info.AllToInit.push_back(Value); 1887 } else if (!AnyErrors) { 1888 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1889 CXXBaseOrMemberInitializer *CXXBaseInit; 1890 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1891 VBase, IsInheritedVirtualBase, 1892 CXXBaseInit)) { 1893 HadError = true; 1894 continue; 1895 } 1896 1897 Info.AllToInit.push_back(CXXBaseInit); 1898 } 1899 } 1900 1901 // Non-virtual bases. 1902 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1903 E = ClassDecl->bases_end(); Base != E; ++Base) { 1904 // Virtuals are in the virtual base list and already constructed. 1905 if (Base->isVirtual()) 1906 continue; 1907 1908 if (CXXBaseOrMemberInitializer *Value 1909 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1910 Info.AllToInit.push_back(Value); 1911 } else if (!AnyErrors) { 1912 CXXBaseOrMemberInitializer *CXXBaseInit; 1913 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1914 Base, /*IsInheritedVirtualBase=*/false, 1915 CXXBaseInit)) { 1916 HadError = true; 1917 continue; 1918 } 1919 1920 Info.AllToInit.push_back(CXXBaseInit); 1921 } 1922 } 1923 1924 // Fields. 1925 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1926 E = ClassDecl->field_end(); Field != E; ++Field) { 1927 if ((*Field)->getType()->isIncompleteArrayType()) { 1928 assert(ClassDecl->hasFlexibleArrayMember() && 1929 "Incomplete array type is not valid"); 1930 continue; 1931 } 1932 if (CollectFieldInitializer(Info, *Field, *Field)) 1933 HadError = true; 1934 } 1935 1936 NumInitializers = Info.AllToInit.size(); 1937 if (NumInitializers > 0) { 1938 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1939 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1940 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1941 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1942 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1943 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1944 1945 // Constructors implicitly reference the base and member 1946 // destructors. 1947 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1948 Constructor->getParent()); 1949 } 1950 1951 return HadError; 1952} 1953 1954static void *GetKeyForTopLevelField(FieldDecl *Field) { 1955 // For anonymous unions, use the class declaration as the key. 1956 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1957 if (RT->getDecl()->isAnonymousStructOrUnion()) 1958 return static_cast<void *>(RT->getDecl()); 1959 } 1960 return static_cast<void *>(Field); 1961} 1962 1963static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1964 return Context.getCanonicalType(BaseType).getTypePtr(); 1965} 1966 1967static void *GetKeyForMember(ASTContext &Context, 1968 CXXBaseOrMemberInitializer *Member, 1969 bool MemberMaybeAnon = false) { 1970 if (!Member->isMemberInitializer()) 1971 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1972 1973 // For fields injected into the class via declaration of an anonymous union, 1974 // use its anonymous union class declaration as the unique key. 1975 FieldDecl *Field = Member->getMember(); 1976 1977 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1978 // data member of the class. Data member used in the initializer list is 1979 // in AnonUnionMember field. 1980 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1981 Field = Member->getAnonUnionMember(); 1982 1983 // If the field is a member of an anonymous struct or union, our key 1984 // is the anonymous record decl that's a direct child of the class. 1985 RecordDecl *RD = Field->getParent(); 1986 if (RD->isAnonymousStructOrUnion()) { 1987 while (true) { 1988 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1989 if (Parent->isAnonymousStructOrUnion()) 1990 RD = Parent; 1991 else 1992 break; 1993 } 1994 1995 return static_cast<void *>(RD); 1996 } 1997 1998 return static_cast<void *>(Field); 1999} 2000 2001static void 2002DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2003 const CXXConstructorDecl *Constructor, 2004 CXXBaseOrMemberInitializer **Inits, 2005 unsigned NumInits) { 2006 if (Constructor->getDeclContext()->isDependentContext()) 2007 return; 2008 2009 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2010 == Diagnostic::Ignored) 2011 return; 2012 2013 // Build the list of bases and members in the order that they'll 2014 // actually be initialized. The explicit initializers should be in 2015 // this same order but may be missing things. 2016 llvm::SmallVector<const void*, 32> IdealInitKeys; 2017 2018 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2019 2020 // 1. Virtual bases. 2021 for (CXXRecordDecl::base_class_const_iterator VBase = 2022 ClassDecl->vbases_begin(), 2023 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2024 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2025 2026 // 2. Non-virtual bases. 2027 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2028 E = ClassDecl->bases_end(); Base != E; ++Base) { 2029 if (Base->isVirtual()) 2030 continue; 2031 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2032 } 2033 2034 // 3. Direct fields. 2035 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2036 E = ClassDecl->field_end(); Field != E; ++Field) 2037 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2038 2039 unsigned NumIdealInits = IdealInitKeys.size(); 2040 unsigned IdealIndex = 0; 2041 2042 CXXBaseOrMemberInitializer *PrevInit = 0; 2043 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2044 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2045 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2046 2047 // Scan forward to try to find this initializer in the idealized 2048 // initializers list. 2049 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2050 if (InitKey == IdealInitKeys[IdealIndex]) 2051 break; 2052 2053 // If we didn't find this initializer, it must be because we 2054 // scanned past it on a previous iteration. That can only 2055 // happen if we're out of order; emit a warning. 2056 if (IdealIndex == NumIdealInits && PrevInit) { 2057 Sema::SemaDiagnosticBuilder D = 2058 SemaRef.Diag(PrevInit->getSourceLocation(), 2059 diag::warn_initializer_out_of_order); 2060 2061 if (PrevInit->isMemberInitializer()) 2062 D << 0 << PrevInit->getMember()->getDeclName(); 2063 else 2064 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2065 2066 if (Init->isMemberInitializer()) 2067 D << 0 << Init->getMember()->getDeclName(); 2068 else 2069 D << 1 << Init->getBaseClassInfo()->getType(); 2070 2071 // Move back to the initializer's location in the ideal list. 2072 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2073 if (InitKey == IdealInitKeys[IdealIndex]) 2074 break; 2075 2076 assert(IdealIndex != NumIdealInits && 2077 "initializer not found in initializer list"); 2078 } 2079 2080 PrevInit = Init; 2081 } 2082} 2083 2084namespace { 2085bool CheckRedundantInit(Sema &S, 2086 CXXBaseOrMemberInitializer *Init, 2087 CXXBaseOrMemberInitializer *&PrevInit) { 2088 if (!PrevInit) { 2089 PrevInit = Init; 2090 return false; 2091 } 2092 2093 if (FieldDecl *Field = Init->getMember()) 2094 S.Diag(Init->getSourceLocation(), 2095 diag::err_multiple_mem_initialization) 2096 << Field->getDeclName() 2097 << Init->getSourceRange(); 2098 else { 2099 Type *BaseClass = Init->getBaseClass(); 2100 assert(BaseClass && "neither field nor base"); 2101 S.Diag(Init->getSourceLocation(), 2102 diag::err_multiple_base_initialization) 2103 << QualType(BaseClass, 0) 2104 << Init->getSourceRange(); 2105 } 2106 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2107 << 0 << PrevInit->getSourceRange(); 2108 2109 return true; 2110} 2111 2112typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2113typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2114 2115bool CheckRedundantUnionInit(Sema &S, 2116 CXXBaseOrMemberInitializer *Init, 2117 RedundantUnionMap &Unions) { 2118 FieldDecl *Field = Init->getMember(); 2119 RecordDecl *Parent = Field->getParent(); 2120 if (!Parent->isAnonymousStructOrUnion()) 2121 return false; 2122 2123 NamedDecl *Child = Field; 2124 do { 2125 if (Parent->isUnion()) { 2126 UnionEntry &En = Unions[Parent]; 2127 if (En.first && En.first != Child) { 2128 S.Diag(Init->getSourceLocation(), 2129 diag::err_multiple_mem_union_initialization) 2130 << Field->getDeclName() 2131 << Init->getSourceRange(); 2132 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2133 << 0 << En.second->getSourceRange(); 2134 return true; 2135 } else if (!En.first) { 2136 En.first = Child; 2137 En.second = Init; 2138 } 2139 } 2140 2141 Child = Parent; 2142 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2143 } while (Parent->isAnonymousStructOrUnion()); 2144 2145 return false; 2146} 2147} 2148 2149/// ActOnMemInitializers - Handle the member initializers for a constructor. 2150void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2151 SourceLocation ColonLoc, 2152 MemInitTy **meminits, unsigned NumMemInits, 2153 bool AnyErrors) { 2154 if (!ConstructorDecl) 2155 return; 2156 2157 AdjustDeclIfTemplate(ConstructorDecl); 2158 2159 CXXConstructorDecl *Constructor 2160 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2161 2162 if (!Constructor) { 2163 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2164 return; 2165 } 2166 2167 CXXBaseOrMemberInitializer **MemInits = 2168 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2169 2170 // Mapping for the duplicate initializers check. 2171 // For member initializers, this is keyed with a FieldDecl*. 2172 // For base initializers, this is keyed with a Type*. 2173 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2174 2175 // Mapping for the inconsistent anonymous-union initializers check. 2176 RedundantUnionMap MemberUnions; 2177 2178 bool HadError = false; 2179 for (unsigned i = 0; i < NumMemInits; i++) { 2180 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2181 2182 // Set the source order index. 2183 Init->setSourceOrder(i); 2184 2185 if (Init->isMemberInitializer()) { 2186 FieldDecl *Field = Init->getMember(); 2187 if (CheckRedundantInit(*this, Init, Members[Field]) || 2188 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2189 HadError = true; 2190 } else { 2191 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2192 if (CheckRedundantInit(*this, Init, Members[Key])) 2193 HadError = true; 2194 } 2195 } 2196 2197 if (HadError) 2198 return; 2199 2200 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2201 2202 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2203} 2204 2205void 2206Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2207 CXXRecordDecl *ClassDecl) { 2208 // Ignore dependent contexts. 2209 if (ClassDecl->isDependentContext()) 2210 return; 2211 2212 // FIXME: all the access-control diagnostics are positioned on the 2213 // field/base declaration. That's probably good; that said, the 2214 // user might reasonably want to know why the destructor is being 2215 // emitted, and we currently don't say. 2216 2217 // Non-static data members. 2218 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2219 E = ClassDecl->field_end(); I != E; ++I) { 2220 FieldDecl *Field = *I; 2221 if (Field->isInvalidDecl()) 2222 continue; 2223 QualType FieldType = Context.getBaseElementType(Field->getType()); 2224 2225 const RecordType* RT = FieldType->getAs<RecordType>(); 2226 if (!RT) 2227 continue; 2228 2229 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2230 if (FieldClassDecl->hasTrivialDestructor()) 2231 continue; 2232 2233 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(); 2234 CheckDestructorAccess(Field->getLocation(), Dtor, 2235 PDiag(diag::err_access_dtor_field) 2236 << Field->getDeclName() 2237 << FieldType); 2238 2239 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2240 } 2241 2242 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2243 2244 // Bases. 2245 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2246 E = ClassDecl->bases_end(); Base != E; ++Base) { 2247 // Bases are always records in a well-formed non-dependent class. 2248 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2249 2250 // Remember direct virtual bases. 2251 if (Base->isVirtual()) 2252 DirectVirtualBases.insert(RT); 2253 2254 // Ignore trivial destructors. 2255 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2256 if (BaseClassDecl->hasTrivialDestructor()) 2257 continue; 2258 2259 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(); 2260 2261 // FIXME: caret should be on the start of the class name 2262 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2263 PDiag(diag::err_access_dtor_base) 2264 << Base->getType() 2265 << Base->getSourceRange()); 2266 2267 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2268 } 2269 2270 // Virtual bases. 2271 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2272 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2273 2274 // Bases are always records in a well-formed non-dependent class. 2275 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2276 2277 // Ignore direct virtual bases. 2278 if (DirectVirtualBases.count(RT)) 2279 continue; 2280 2281 // Ignore trivial destructors. 2282 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2283 if (BaseClassDecl->hasTrivialDestructor()) 2284 continue; 2285 2286 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(); 2287 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2288 PDiag(diag::err_access_dtor_vbase) 2289 << VBase->getType()); 2290 2291 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2292 } 2293} 2294 2295void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2296 if (!CDtorDecl) 2297 return; 2298 2299 if (CXXConstructorDecl *Constructor 2300 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2301 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2302} 2303 2304bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2305 unsigned DiagID, AbstractDiagSelID SelID, 2306 const CXXRecordDecl *CurrentRD) { 2307 if (SelID == -1) 2308 return RequireNonAbstractType(Loc, T, 2309 PDiag(DiagID), CurrentRD); 2310 else 2311 return RequireNonAbstractType(Loc, T, 2312 PDiag(DiagID) << SelID, CurrentRD); 2313} 2314 2315bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2316 const PartialDiagnostic &PD, 2317 const CXXRecordDecl *CurrentRD) { 2318 if (!getLangOptions().CPlusPlus) 2319 return false; 2320 2321 if (const ArrayType *AT = Context.getAsArrayType(T)) 2322 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2323 CurrentRD); 2324 2325 if (const PointerType *PT = T->getAs<PointerType>()) { 2326 // Find the innermost pointer type. 2327 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2328 PT = T; 2329 2330 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2331 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2332 } 2333 2334 const RecordType *RT = T->getAs<RecordType>(); 2335 if (!RT) 2336 return false; 2337 2338 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2339 2340 if (CurrentRD && CurrentRD != RD) 2341 return false; 2342 2343 // FIXME: is this reasonable? It matches current behavior, but.... 2344 if (!RD->getDefinition()) 2345 return false; 2346 2347 if (!RD->isAbstract()) 2348 return false; 2349 2350 Diag(Loc, PD) << RD->getDeclName(); 2351 2352 // Check if we've already emitted the list of pure virtual functions for this 2353 // class. 2354 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2355 return true; 2356 2357 CXXFinalOverriderMap FinalOverriders; 2358 RD->getFinalOverriders(FinalOverriders); 2359 2360 // Keep a set of seen pure methods so we won't diagnose the same method 2361 // more than once. 2362 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2363 2364 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2365 MEnd = FinalOverriders.end(); 2366 M != MEnd; 2367 ++M) { 2368 for (OverridingMethods::iterator SO = M->second.begin(), 2369 SOEnd = M->second.end(); 2370 SO != SOEnd; ++SO) { 2371 // C++ [class.abstract]p4: 2372 // A class is abstract if it contains or inherits at least one 2373 // pure virtual function for which the final overrider is pure 2374 // virtual. 2375 2376 // 2377 if (SO->second.size() != 1) 2378 continue; 2379 2380 if (!SO->second.front().Method->isPure()) 2381 continue; 2382 2383 if (!SeenPureMethods.insert(SO->second.front().Method)) 2384 continue; 2385 2386 Diag(SO->second.front().Method->getLocation(), 2387 diag::note_pure_virtual_function) 2388 << SO->second.front().Method->getDeclName(); 2389 } 2390 } 2391 2392 if (!PureVirtualClassDiagSet) 2393 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2394 PureVirtualClassDiagSet->insert(RD); 2395 2396 return true; 2397} 2398 2399namespace { 2400 class AbstractClassUsageDiagnoser 2401 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2402 Sema &SemaRef; 2403 CXXRecordDecl *AbstractClass; 2404 2405 bool VisitDeclContext(const DeclContext *DC) { 2406 bool Invalid = false; 2407 2408 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2409 E = DC->decls_end(); I != E; ++I) 2410 Invalid |= Visit(*I); 2411 2412 return Invalid; 2413 } 2414 2415 public: 2416 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2417 : SemaRef(SemaRef), AbstractClass(ac) { 2418 Visit(SemaRef.Context.getTranslationUnitDecl()); 2419 } 2420 2421 bool VisitFunctionDecl(const FunctionDecl *FD) { 2422 if (FD->isThisDeclarationADefinition()) { 2423 // No need to do the check if we're in a definition, because it requires 2424 // that the return/param types are complete. 2425 // because that requires 2426 return VisitDeclContext(FD); 2427 } 2428 2429 // Check the return type. 2430 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2431 bool Invalid = 2432 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2433 diag::err_abstract_type_in_decl, 2434 Sema::AbstractReturnType, 2435 AbstractClass); 2436 2437 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2438 E = FD->param_end(); I != E; ++I) { 2439 const ParmVarDecl *VD = *I; 2440 Invalid |= 2441 SemaRef.RequireNonAbstractType(VD->getLocation(), 2442 VD->getOriginalType(), 2443 diag::err_abstract_type_in_decl, 2444 Sema::AbstractParamType, 2445 AbstractClass); 2446 } 2447 2448 return Invalid; 2449 } 2450 2451 bool VisitDecl(const Decl* D) { 2452 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2453 return VisitDeclContext(DC); 2454 2455 return false; 2456 } 2457 }; 2458} 2459 2460/// \brief Perform semantic checks on a class definition that has been 2461/// completing, introducing implicitly-declared members, checking for 2462/// abstract types, etc. 2463void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2464 if (!Record || Record->isInvalidDecl()) 2465 return; 2466 2467 if (!Record->isDependentType()) 2468 AddImplicitlyDeclaredMembersToClass(S, Record); 2469 2470 if (Record->isInvalidDecl()) 2471 return; 2472 2473 // Set access bits correctly on the directly-declared conversions. 2474 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2475 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2476 Convs->setAccess(I, (*I)->getAccess()); 2477 2478 // Determine whether we need to check for final overriders. We do 2479 // this either when there are virtual base classes (in which case we 2480 // may end up finding multiple final overriders for a given virtual 2481 // function) or any of the base classes is abstract (in which case 2482 // we might detect that this class is abstract). 2483 bool CheckFinalOverriders = false; 2484 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2485 !Record->isDependentType()) { 2486 if (Record->getNumVBases()) 2487 CheckFinalOverriders = true; 2488 else if (!Record->isAbstract()) { 2489 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2490 BEnd = Record->bases_end(); 2491 B != BEnd; ++B) { 2492 CXXRecordDecl *BaseDecl 2493 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2494 if (BaseDecl->isAbstract()) { 2495 CheckFinalOverriders = true; 2496 break; 2497 } 2498 } 2499 } 2500 } 2501 2502 if (CheckFinalOverriders) { 2503 CXXFinalOverriderMap FinalOverriders; 2504 Record->getFinalOverriders(FinalOverriders); 2505 2506 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2507 MEnd = FinalOverriders.end(); 2508 M != MEnd; ++M) { 2509 for (OverridingMethods::iterator SO = M->second.begin(), 2510 SOEnd = M->second.end(); 2511 SO != SOEnd; ++SO) { 2512 assert(SO->second.size() > 0 && 2513 "All virtual functions have overridding virtual functions"); 2514 if (SO->second.size() == 1) { 2515 // C++ [class.abstract]p4: 2516 // A class is abstract if it contains or inherits at least one 2517 // pure virtual function for which the final overrider is pure 2518 // virtual. 2519 if (SO->second.front().Method->isPure()) 2520 Record->setAbstract(true); 2521 continue; 2522 } 2523 2524 // C++ [class.virtual]p2: 2525 // In a derived class, if a virtual member function of a base 2526 // class subobject has more than one final overrider the 2527 // program is ill-formed. 2528 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2529 << (NamedDecl *)M->first << Record; 2530 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2531 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2532 OMEnd = SO->second.end(); 2533 OM != OMEnd; ++OM) 2534 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2535 << (NamedDecl *)M->first << OM->Method->getParent(); 2536 2537 Record->setInvalidDecl(); 2538 } 2539 } 2540 } 2541 2542 if (Record->isAbstract() && !Record->isInvalidDecl()) 2543 (void)AbstractClassUsageDiagnoser(*this, Record); 2544 2545 // If this is not an aggregate type and has no user-declared constructor, 2546 // complain about any non-static data members of reference or const scalar 2547 // type, since they will never get initializers. 2548 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2549 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2550 bool Complained = false; 2551 for (RecordDecl::field_iterator F = Record->field_begin(), 2552 FEnd = Record->field_end(); 2553 F != FEnd; ++F) { 2554 if (F->getType()->isReferenceType() || 2555 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2556 if (!Complained) { 2557 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2558 << Record->getTagKind() << Record; 2559 Complained = true; 2560 } 2561 2562 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2563 << F->getType()->isReferenceType() 2564 << F->getDeclName(); 2565 } 2566 } 2567 } 2568 2569 if (Record->isDynamicClass()) 2570 DynamicClasses.push_back(Record); 2571} 2572 2573void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2574 DeclPtrTy TagDecl, 2575 SourceLocation LBrac, 2576 SourceLocation RBrac, 2577 AttributeList *AttrList) { 2578 if (!TagDecl) 2579 return; 2580 2581 AdjustDeclIfTemplate(TagDecl); 2582 2583 ActOnFields(S, RLoc, TagDecl, 2584 (DeclPtrTy*)FieldCollector->getCurFields(), 2585 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2586 2587 CheckCompletedCXXClass(S, 2588 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2589} 2590 2591namespace { 2592 /// \brief Helper class that collects exception specifications for 2593 /// implicitly-declared special member functions. 2594 class ImplicitExceptionSpecification { 2595 ASTContext &Context; 2596 bool AllowsAllExceptions; 2597 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2598 llvm::SmallVector<QualType, 4> Exceptions; 2599 2600 public: 2601 explicit ImplicitExceptionSpecification(ASTContext &Context) 2602 : Context(Context), AllowsAllExceptions(false) { } 2603 2604 /// \brief Whether the special member function should have any 2605 /// exception specification at all. 2606 bool hasExceptionSpecification() const { 2607 return !AllowsAllExceptions; 2608 } 2609 2610 /// \brief Whether the special member function should have a 2611 /// throw(...) exception specification (a Microsoft extension). 2612 bool hasAnyExceptionSpecification() const { 2613 return false; 2614 } 2615 2616 /// \brief The number of exceptions in the exception specification. 2617 unsigned size() const { return Exceptions.size(); } 2618 2619 /// \brief The set of exceptions in the exception specification. 2620 const QualType *data() const { return Exceptions.data(); } 2621 2622 /// \brief Note that 2623 void CalledDecl(CXXMethodDecl *Method) { 2624 // If we already know that we allow all exceptions, do nothing. 2625 if (AllowsAllExceptions || !Method) 2626 return; 2627 2628 const FunctionProtoType *Proto 2629 = Method->getType()->getAs<FunctionProtoType>(); 2630 2631 // If this function can throw any exceptions, make a note of that. 2632 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2633 AllowsAllExceptions = true; 2634 ExceptionsSeen.clear(); 2635 Exceptions.clear(); 2636 return; 2637 } 2638 2639 // Record the exceptions in this function's exception specification. 2640 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2641 EEnd = Proto->exception_end(); 2642 E != EEnd; ++E) 2643 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2644 Exceptions.push_back(*E); 2645 } 2646 }; 2647} 2648 2649 2650/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2651/// special functions, such as the default constructor, copy 2652/// constructor, or destructor, to the given C++ class (C++ 2653/// [special]p1). This routine can only be executed just before the 2654/// definition of the class is complete. 2655/// 2656/// The scope, if provided, is the class scope. 2657void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2658 CXXRecordDecl *ClassDecl) { 2659 CanQualType ClassType 2660 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2661 2662 // FIXME: Implicit declarations have exception specifications, which are 2663 // the union of the specifications of the implicitly called functions. 2664 2665 if (!ClassDecl->hasUserDeclaredConstructor()) { 2666 // C++ [class.ctor]p5: 2667 // A default constructor for a class X is a constructor of class X 2668 // that can be called without an argument. If there is no 2669 // user-declared constructor for class X, a default constructor is 2670 // implicitly declared. An implicitly-declared default constructor 2671 // is an inline public member of its class. 2672 DeclarationName Name 2673 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2674 CXXConstructorDecl *DefaultCon = 2675 CXXConstructorDecl::Create(Context, ClassDecl, 2676 ClassDecl->getLocation(), Name, 2677 Context.getFunctionType(Context.VoidTy, 2678 0, 0, false, 0, 2679 /*FIXME*/false, false, 2680 0, 0, 2681 FunctionType::ExtInfo()), 2682 /*TInfo=*/0, 2683 /*isExplicit=*/false, 2684 /*isInline=*/true, 2685 /*isImplicitlyDeclared=*/true); 2686 DefaultCon->setAccess(AS_public); 2687 DefaultCon->setImplicit(); 2688 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2689 if (S) 2690 PushOnScopeChains(DefaultCon, S, true); 2691 else 2692 ClassDecl->addDecl(DefaultCon); 2693 } 2694 2695 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2696 DeclareImplicitCopyConstructor(S, ClassDecl); 2697 2698 if (!ClassDecl->hasUserDeclaredCopyAssignment()) 2699 DeclareImplicitCopyAssignment(S, ClassDecl); 2700 2701 if (!ClassDecl->hasUserDeclaredDestructor()) { 2702 // C++ [class.dtor]p2: 2703 // If a class has no user-declared destructor, a destructor is 2704 // declared implicitly. An implicitly-declared destructor is an 2705 // inline public member of its class. 2706 2707 // C++ [except.spec]p14: 2708 // An implicitly declared special member function (Clause 12) shall have 2709 // an exception-specification. 2710 ImplicitExceptionSpecification ExceptSpec(Context); 2711 2712 // Direct base-class destructors. 2713 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 2714 BEnd = ClassDecl->bases_end(); 2715 B != BEnd; ++B) { 2716 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 2717 ExceptSpec.CalledDecl( 2718 cast<CXXRecordDecl>(BaseType->getDecl())->getDestructor()); 2719 } 2720 2721 // Virtual base-class destructors. 2722 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 2723 BEnd = ClassDecl->vbases_end(); 2724 B != BEnd; ++B) { 2725 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 2726 ExceptSpec.CalledDecl( 2727 cast<CXXRecordDecl>(BaseType->getDecl())->getDestructor()); 2728 } 2729 2730 // Field destructors. 2731 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 2732 FEnd = ClassDecl->field_end(); 2733 F != FEnd; ++F) { 2734 if (const RecordType *RecordTy 2735 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 2736 ExceptSpec.CalledDecl( 2737 cast<CXXRecordDecl>(RecordTy->getDecl())->getDestructor()); 2738 } 2739 2740 QualType Ty = Context.getFunctionType(Context.VoidTy, 2741 0, 0, false, 0, 2742 ExceptSpec.hasExceptionSpecification(), 2743 ExceptSpec.hasAnyExceptionSpecification(), 2744 ExceptSpec.size(), 2745 ExceptSpec.data(), 2746 FunctionType::ExtInfo()); 2747 2748 DeclarationName Name 2749 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2750 CXXDestructorDecl *Destructor 2751 = CXXDestructorDecl::Create(Context, ClassDecl, 2752 ClassDecl->getLocation(), Name, Ty, 2753 /*isInline=*/true, 2754 /*isImplicitlyDeclared=*/true); 2755 Destructor->setAccess(AS_public); 2756 Destructor->setImplicit(); 2757 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2758 if (S) 2759 PushOnScopeChains(Destructor, S, true); 2760 else 2761 ClassDecl->addDecl(Destructor); 2762 2763 // This could be uniqued if it ever proves significant. 2764 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2765 2766 AddOverriddenMethods(ClassDecl, Destructor); 2767 } 2768} 2769 2770void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2771 Decl *D = TemplateD.getAs<Decl>(); 2772 if (!D) 2773 return; 2774 2775 TemplateParameterList *Params = 0; 2776 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2777 Params = Template->getTemplateParameters(); 2778 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2779 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2780 Params = PartialSpec->getTemplateParameters(); 2781 else 2782 return; 2783 2784 for (TemplateParameterList::iterator Param = Params->begin(), 2785 ParamEnd = Params->end(); 2786 Param != ParamEnd; ++Param) { 2787 NamedDecl *Named = cast<NamedDecl>(*Param); 2788 if (Named->getDeclName()) { 2789 S->AddDecl(DeclPtrTy::make(Named)); 2790 IdResolver.AddDecl(Named); 2791 } 2792 } 2793} 2794 2795void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2796 if (!RecordD) return; 2797 AdjustDeclIfTemplate(RecordD); 2798 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2799 PushDeclContext(S, Record); 2800} 2801 2802void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2803 if (!RecordD) return; 2804 PopDeclContext(); 2805} 2806 2807/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2808/// parsing a top-level (non-nested) C++ class, and we are now 2809/// parsing those parts of the given Method declaration that could 2810/// not be parsed earlier (C++ [class.mem]p2), such as default 2811/// arguments. This action should enter the scope of the given 2812/// Method declaration as if we had just parsed the qualified method 2813/// name. However, it should not bring the parameters into scope; 2814/// that will be performed by ActOnDelayedCXXMethodParameter. 2815void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2816} 2817 2818/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2819/// C++ method declaration. We're (re-)introducing the given 2820/// function parameter into scope for use in parsing later parts of 2821/// the method declaration. For example, we could see an 2822/// ActOnParamDefaultArgument event for this parameter. 2823void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2824 if (!ParamD) 2825 return; 2826 2827 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2828 2829 // If this parameter has an unparsed default argument, clear it out 2830 // to make way for the parsed default argument. 2831 if (Param->hasUnparsedDefaultArg()) 2832 Param->setDefaultArg(0); 2833 2834 S->AddDecl(DeclPtrTy::make(Param)); 2835 if (Param->getDeclName()) 2836 IdResolver.AddDecl(Param); 2837} 2838 2839/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2840/// processing the delayed method declaration for Method. The method 2841/// declaration is now considered finished. There may be a separate 2842/// ActOnStartOfFunctionDef action later (not necessarily 2843/// immediately!) for this method, if it was also defined inside the 2844/// class body. 2845void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2846 if (!MethodD) 2847 return; 2848 2849 AdjustDeclIfTemplate(MethodD); 2850 2851 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2852 2853 // Now that we have our default arguments, check the constructor 2854 // again. It could produce additional diagnostics or affect whether 2855 // the class has implicitly-declared destructors, among other 2856 // things. 2857 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2858 CheckConstructor(Constructor); 2859 2860 // Check the default arguments, which we may have added. 2861 if (!Method->isInvalidDecl()) 2862 CheckCXXDefaultArguments(Method); 2863} 2864 2865/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2866/// the well-formedness of the constructor declarator @p D with type @p 2867/// R. If there are any errors in the declarator, this routine will 2868/// emit diagnostics and set the invalid bit to true. In any case, the type 2869/// will be updated to reflect a well-formed type for the constructor and 2870/// returned. 2871QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2872 FunctionDecl::StorageClass &SC) { 2873 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2874 2875 // C++ [class.ctor]p3: 2876 // A constructor shall not be virtual (10.3) or static (9.4). A 2877 // constructor can be invoked for a const, volatile or const 2878 // volatile object. A constructor shall not be declared const, 2879 // volatile, or const volatile (9.3.2). 2880 if (isVirtual) { 2881 if (!D.isInvalidType()) 2882 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2883 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2884 << SourceRange(D.getIdentifierLoc()); 2885 D.setInvalidType(); 2886 } 2887 if (SC == FunctionDecl::Static) { 2888 if (!D.isInvalidType()) 2889 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2890 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2891 << SourceRange(D.getIdentifierLoc()); 2892 D.setInvalidType(); 2893 SC = FunctionDecl::None; 2894 } 2895 2896 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2897 if (FTI.TypeQuals != 0) { 2898 if (FTI.TypeQuals & Qualifiers::Const) 2899 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2900 << "const" << SourceRange(D.getIdentifierLoc()); 2901 if (FTI.TypeQuals & Qualifiers::Volatile) 2902 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2903 << "volatile" << SourceRange(D.getIdentifierLoc()); 2904 if (FTI.TypeQuals & Qualifiers::Restrict) 2905 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2906 << "restrict" << SourceRange(D.getIdentifierLoc()); 2907 } 2908 2909 // Rebuild the function type "R" without any type qualifiers (in 2910 // case any of the errors above fired) and with "void" as the 2911 // return type, since constructors don't have return types. 2912 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2913 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2914 Proto->getNumArgs(), 2915 Proto->isVariadic(), 0, 2916 Proto->hasExceptionSpec(), 2917 Proto->hasAnyExceptionSpec(), 2918 Proto->getNumExceptions(), 2919 Proto->exception_begin(), 2920 Proto->getExtInfo()); 2921} 2922 2923/// CheckConstructor - Checks a fully-formed constructor for 2924/// well-formedness, issuing any diagnostics required. Returns true if 2925/// the constructor declarator is invalid. 2926void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2927 CXXRecordDecl *ClassDecl 2928 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2929 if (!ClassDecl) 2930 return Constructor->setInvalidDecl(); 2931 2932 // C++ [class.copy]p3: 2933 // A declaration of a constructor for a class X is ill-formed if 2934 // its first parameter is of type (optionally cv-qualified) X and 2935 // either there are no other parameters or else all other 2936 // parameters have default arguments. 2937 if (!Constructor->isInvalidDecl() && 2938 ((Constructor->getNumParams() == 1) || 2939 (Constructor->getNumParams() > 1 && 2940 Constructor->getParamDecl(1)->hasDefaultArg())) && 2941 Constructor->getTemplateSpecializationKind() 2942 != TSK_ImplicitInstantiation) { 2943 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2944 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2945 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2946 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2947 const char *ConstRef 2948 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2949 : " const &"; 2950 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2951 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2952 2953 // FIXME: Rather that making the constructor invalid, we should endeavor 2954 // to fix the type. 2955 Constructor->setInvalidDecl(); 2956 } 2957 } 2958 2959 // Notify the class that we've added a constructor. In principle we 2960 // don't need to do this for out-of-line declarations; in practice 2961 // we only instantiate the most recent declaration of a method, so 2962 // we have to call this for everything but friends. 2963 if (!Constructor->getFriendObjectKind()) 2964 ClassDecl->addedConstructor(Context, Constructor); 2965} 2966 2967/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2968/// issuing any diagnostics required. Returns true on error. 2969bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2970 CXXRecordDecl *RD = Destructor->getParent(); 2971 2972 if (Destructor->isVirtual()) { 2973 SourceLocation Loc; 2974 2975 if (!Destructor->isImplicit()) 2976 Loc = Destructor->getLocation(); 2977 else 2978 Loc = RD->getLocation(); 2979 2980 // If we have a virtual destructor, look up the deallocation function 2981 FunctionDecl *OperatorDelete = 0; 2982 DeclarationName Name = 2983 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2984 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2985 return true; 2986 2987 Destructor->setOperatorDelete(OperatorDelete); 2988 } 2989 2990 return false; 2991} 2992 2993static inline bool 2994FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2995 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2996 FTI.ArgInfo[0].Param && 2997 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2998} 2999 3000/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3001/// the well-formednes of the destructor declarator @p D with type @p 3002/// R. If there are any errors in the declarator, this routine will 3003/// emit diagnostics and set the declarator to invalid. Even if this happens, 3004/// will be updated to reflect a well-formed type for the destructor and 3005/// returned. 3006QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3007 FunctionDecl::StorageClass& SC) { 3008 // C++ [class.dtor]p1: 3009 // [...] A typedef-name that names a class is a class-name 3010 // (7.1.3); however, a typedef-name that names a class shall not 3011 // be used as the identifier in the declarator for a destructor 3012 // declaration. 3013 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3014 if (isa<TypedefType>(DeclaratorType)) 3015 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3016 << DeclaratorType; 3017 3018 // C++ [class.dtor]p2: 3019 // A destructor is used to destroy objects of its class type. A 3020 // destructor takes no parameters, and no return type can be 3021 // specified for it (not even void). The address of a destructor 3022 // shall not be taken. A destructor shall not be static. A 3023 // destructor can be invoked for a const, volatile or const 3024 // volatile object. A destructor shall not be declared const, 3025 // volatile or const volatile (9.3.2). 3026 if (SC == FunctionDecl::Static) { 3027 if (!D.isInvalidType()) 3028 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3029 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3030 << SourceRange(D.getIdentifierLoc()) 3031 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3032 3033 SC = FunctionDecl::None; 3034 } 3035 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3036 // Destructors don't have return types, but the parser will 3037 // happily parse something like: 3038 // 3039 // class X { 3040 // float ~X(); 3041 // }; 3042 // 3043 // The return type will be eliminated later. 3044 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3045 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3046 << SourceRange(D.getIdentifierLoc()); 3047 } 3048 3049 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3050 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3051 if (FTI.TypeQuals & Qualifiers::Const) 3052 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3053 << "const" << SourceRange(D.getIdentifierLoc()); 3054 if (FTI.TypeQuals & Qualifiers::Volatile) 3055 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3056 << "volatile" << SourceRange(D.getIdentifierLoc()); 3057 if (FTI.TypeQuals & Qualifiers::Restrict) 3058 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3059 << "restrict" << SourceRange(D.getIdentifierLoc()); 3060 D.setInvalidType(); 3061 } 3062 3063 // Make sure we don't have any parameters. 3064 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3065 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3066 3067 // Delete the parameters. 3068 FTI.freeArgs(); 3069 D.setInvalidType(); 3070 } 3071 3072 // Make sure the destructor isn't variadic. 3073 if (FTI.isVariadic) { 3074 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3075 D.setInvalidType(); 3076 } 3077 3078 // Rebuild the function type "R" without any type qualifiers or 3079 // parameters (in case any of the errors above fired) and with 3080 // "void" as the return type, since destructors don't have return 3081 // types. 3082 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3083 if (!Proto) 3084 return QualType(); 3085 3086 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3087 Proto->hasExceptionSpec(), 3088 Proto->hasAnyExceptionSpec(), 3089 Proto->getNumExceptions(), 3090 Proto->exception_begin(), 3091 Proto->getExtInfo()); 3092} 3093 3094/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3095/// well-formednes of the conversion function declarator @p D with 3096/// type @p R. If there are any errors in the declarator, this routine 3097/// will emit diagnostics and return true. Otherwise, it will return 3098/// false. Either way, the type @p R will be updated to reflect a 3099/// well-formed type for the conversion operator. 3100void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3101 FunctionDecl::StorageClass& SC) { 3102 // C++ [class.conv.fct]p1: 3103 // Neither parameter types nor return type can be specified. The 3104 // type of a conversion function (8.3.5) is "function taking no 3105 // parameter returning conversion-type-id." 3106 if (SC == FunctionDecl::Static) { 3107 if (!D.isInvalidType()) 3108 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3109 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3110 << SourceRange(D.getIdentifierLoc()); 3111 D.setInvalidType(); 3112 SC = FunctionDecl::None; 3113 } 3114 3115 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3116 3117 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3118 // Conversion functions don't have return types, but the parser will 3119 // happily parse something like: 3120 // 3121 // class X { 3122 // float operator bool(); 3123 // }; 3124 // 3125 // The return type will be changed later anyway. 3126 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3127 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3128 << SourceRange(D.getIdentifierLoc()); 3129 D.setInvalidType(); 3130 } 3131 3132 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3133 3134 // Make sure we don't have any parameters. 3135 if (Proto->getNumArgs() > 0) { 3136 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3137 3138 // Delete the parameters. 3139 D.getTypeObject(0).Fun.freeArgs(); 3140 D.setInvalidType(); 3141 } else if (Proto->isVariadic()) { 3142 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3143 D.setInvalidType(); 3144 } 3145 3146 // Diagnose "&operator bool()" and other such nonsense. This 3147 // is actually a gcc extension which we don't support. 3148 if (Proto->getResultType() != ConvType) { 3149 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3150 << Proto->getResultType(); 3151 D.setInvalidType(); 3152 ConvType = Proto->getResultType(); 3153 } 3154 3155 // C++ [class.conv.fct]p4: 3156 // The conversion-type-id shall not represent a function type nor 3157 // an array type. 3158 if (ConvType->isArrayType()) { 3159 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3160 ConvType = Context.getPointerType(ConvType); 3161 D.setInvalidType(); 3162 } else if (ConvType->isFunctionType()) { 3163 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3164 ConvType = Context.getPointerType(ConvType); 3165 D.setInvalidType(); 3166 } 3167 3168 // Rebuild the function type "R" without any parameters (in case any 3169 // of the errors above fired) and with the conversion type as the 3170 // return type. 3171 if (D.isInvalidType()) { 3172 R = Context.getFunctionType(ConvType, 0, 0, false, 3173 Proto->getTypeQuals(), 3174 Proto->hasExceptionSpec(), 3175 Proto->hasAnyExceptionSpec(), 3176 Proto->getNumExceptions(), 3177 Proto->exception_begin(), 3178 Proto->getExtInfo()); 3179 } 3180 3181 // C++0x explicit conversion operators. 3182 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3183 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3184 diag::warn_explicit_conversion_functions) 3185 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3186} 3187 3188/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3189/// the declaration of the given C++ conversion function. This routine 3190/// is responsible for recording the conversion function in the C++ 3191/// class, if possible. 3192Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3193 assert(Conversion && "Expected to receive a conversion function declaration"); 3194 3195 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3196 3197 // Make sure we aren't redeclaring the conversion function. 3198 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3199 3200 // C++ [class.conv.fct]p1: 3201 // [...] A conversion function is never used to convert a 3202 // (possibly cv-qualified) object to the (possibly cv-qualified) 3203 // same object type (or a reference to it), to a (possibly 3204 // cv-qualified) base class of that type (or a reference to it), 3205 // or to (possibly cv-qualified) void. 3206 // FIXME: Suppress this warning if the conversion function ends up being a 3207 // virtual function that overrides a virtual function in a base class. 3208 QualType ClassType 3209 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3210 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3211 ConvType = ConvTypeRef->getPointeeType(); 3212 if (ConvType->isRecordType()) { 3213 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3214 if (ConvType == ClassType) 3215 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3216 << ClassType; 3217 else if (IsDerivedFrom(ClassType, ConvType)) 3218 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3219 << ClassType << ConvType; 3220 } else if (ConvType->isVoidType()) { 3221 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3222 << ClassType << ConvType; 3223 } 3224 3225 if (Conversion->getPrimaryTemplate()) { 3226 // ignore specializations 3227 } else if (Conversion->getPreviousDeclaration()) { 3228 if (FunctionTemplateDecl *ConversionTemplate 3229 = Conversion->getDescribedFunctionTemplate()) { 3230 if (ClassDecl->replaceConversion( 3231 ConversionTemplate->getPreviousDeclaration(), 3232 ConversionTemplate)) 3233 return DeclPtrTy::make(ConversionTemplate); 3234 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3235 Conversion)) 3236 return DeclPtrTy::make(Conversion); 3237 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3238 } else if (FunctionTemplateDecl *ConversionTemplate 3239 = Conversion->getDescribedFunctionTemplate()) 3240 ClassDecl->addConversionFunction(ConversionTemplate); 3241 else 3242 ClassDecl->addConversionFunction(Conversion); 3243 3244 return DeclPtrTy::make(Conversion); 3245} 3246 3247//===----------------------------------------------------------------------===// 3248// Namespace Handling 3249//===----------------------------------------------------------------------===// 3250 3251/// ActOnStartNamespaceDef - This is called at the start of a namespace 3252/// definition. 3253Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3254 SourceLocation IdentLoc, 3255 IdentifierInfo *II, 3256 SourceLocation LBrace, 3257 AttributeList *AttrList) { 3258 NamespaceDecl *Namespc = 3259 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3260 Namespc->setLBracLoc(LBrace); 3261 3262 Scope *DeclRegionScope = NamespcScope->getParent(); 3263 3264 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3265 3266 if (II) { 3267 // C++ [namespace.def]p2: 3268 // The identifier in an original-namespace-definition shall not have been 3269 // previously defined in the declarative region in which the 3270 // original-namespace-definition appears. The identifier in an 3271 // original-namespace-definition is the name of the namespace. Subsequently 3272 // in that declarative region, it is treated as an original-namespace-name. 3273 3274 NamedDecl *PrevDecl 3275 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3276 ForRedeclaration); 3277 3278 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3279 // This is an extended namespace definition. 3280 // Attach this namespace decl to the chain of extended namespace 3281 // definitions. 3282 OrigNS->setNextNamespace(Namespc); 3283 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3284 3285 // Remove the previous declaration from the scope. 3286 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3287 IdResolver.RemoveDecl(OrigNS); 3288 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3289 } 3290 } else if (PrevDecl) { 3291 // This is an invalid name redefinition. 3292 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3293 << Namespc->getDeclName(); 3294 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3295 Namespc->setInvalidDecl(); 3296 // Continue on to push Namespc as current DeclContext and return it. 3297 } else if (II->isStr("std") && 3298 CurContext->getLookupContext()->isTranslationUnit()) { 3299 // This is the first "real" definition of the namespace "std", so update 3300 // our cache of the "std" namespace to point at this definition. 3301 if (StdNamespace) { 3302 // We had already defined a dummy namespace "std". Link this new 3303 // namespace definition to the dummy namespace "std". 3304 StdNamespace->setNextNamespace(Namespc); 3305 StdNamespace->setLocation(IdentLoc); 3306 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3307 } 3308 3309 // Make our StdNamespace cache point at the first real definition of the 3310 // "std" namespace. 3311 StdNamespace = Namespc; 3312 } 3313 3314 PushOnScopeChains(Namespc, DeclRegionScope); 3315 } else { 3316 // Anonymous namespaces. 3317 assert(Namespc->isAnonymousNamespace()); 3318 3319 // Link the anonymous namespace into its parent. 3320 NamespaceDecl *PrevDecl; 3321 DeclContext *Parent = CurContext->getLookupContext(); 3322 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3323 PrevDecl = TU->getAnonymousNamespace(); 3324 TU->setAnonymousNamespace(Namespc); 3325 } else { 3326 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3327 PrevDecl = ND->getAnonymousNamespace(); 3328 ND->setAnonymousNamespace(Namespc); 3329 } 3330 3331 // Link the anonymous namespace with its previous declaration. 3332 if (PrevDecl) { 3333 assert(PrevDecl->isAnonymousNamespace()); 3334 assert(!PrevDecl->getNextNamespace()); 3335 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3336 PrevDecl->setNextNamespace(Namespc); 3337 } 3338 3339 CurContext->addDecl(Namespc); 3340 3341 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3342 // behaves as if it were replaced by 3343 // namespace unique { /* empty body */ } 3344 // using namespace unique; 3345 // namespace unique { namespace-body } 3346 // where all occurrences of 'unique' in a translation unit are 3347 // replaced by the same identifier and this identifier differs 3348 // from all other identifiers in the entire program. 3349 3350 // We just create the namespace with an empty name and then add an 3351 // implicit using declaration, just like the standard suggests. 3352 // 3353 // CodeGen enforces the "universally unique" aspect by giving all 3354 // declarations semantically contained within an anonymous 3355 // namespace internal linkage. 3356 3357 if (!PrevDecl) { 3358 UsingDirectiveDecl* UD 3359 = UsingDirectiveDecl::Create(Context, CurContext, 3360 /* 'using' */ LBrace, 3361 /* 'namespace' */ SourceLocation(), 3362 /* qualifier */ SourceRange(), 3363 /* NNS */ NULL, 3364 /* identifier */ SourceLocation(), 3365 Namespc, 3366 /* Ancestor */ CurContext); 3367 UD->setImplicit(); 3368 CurContext->addDecl(UD); 3369 } 3370 } 3371 3372 // Although we could have an invalid decl (i.e. the namespace name is a 3373 // redefinition), push it as current DeclContext and try to continue parsing. 3374 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3375 // for the namespace has the declarations that showed up in that particular 3376 // namespace definition. 3377 PushDeclContext(NamespcScope, Namespc); 3378 return DeclPtrTy::make(Namespc); 3379} 3380 3381/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3382/// is a namespace alias, returns the namespace it points to. 3383static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3384 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3385 return AD->getNamespace(); 3386 return dyn_cast_or_null<NamespaceDecl>(D); 3387} 3388 3389/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3390/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3391void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3392 Decl *Dcl = D.getAs<Decl>(); 3393 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3394 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3395 Namespc->setRBracLoc(RBrace); 3396 PopDeclContext(); 3397} 3398 3399/// \brief Retrieve the special "std" namespace, which may require us to 3400/// implicitly define the namespace. 3401NamespaceDecl *Sema::getStdNamespace() { 3402 if (!StdNamespace) { 3403 // The "std" namespace has not yet been defined, so build one implicitly. 3404 StdNamespace = NamespaceDecl::Create(Context, 3405 Context.getTranslationUnitDecl(), 3406 SourceLocation(), 3407 &PP.getIdentifierTable().get("std")); 3408 StdNamespace->setImplicit(true); 3409 } 3410 3411 return StdNamespace; 3412} 3413 3414Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3415 SourceLocation UsingLoc, 3416 SourceLocation NamespcLoc, 3417 CXXScopeSpec &SS, 3418 SourceLocation IdentLoc, 3419 IdentifierInfo *NamespcName, 3420 AttributeList *AttrList) { 3421 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3422 assert(NamespcName && "Invalid NamespcName."); 3423 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3424 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3425 3426 UsingDirectiveDecl *UDir = 0; 3427 NestedNameSpecifier *Qualifier = 0; 3428 if (SS.isSet()) 3429 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3430 3431 // Lookup namespace name. 3432 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3433 LookupParsedName(R, S, &SS); 3434 if (R.isAmbiguous()) 3435 return DeclPtrTy(); 3436 3437 if (R.empty()) { 3438 // Allow "using namespace std;" or "using namespace ::std;" even if 3439 // "std" hasn't been defined yet, for GCC compatibility. 3440 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3441 NamespcName->isStr("std")) { 3442 Diag(IdentLoc, diag::ext_using_undefined_std); 3443 R.addDecl(getStdNamespace()); 3444 R.resolveKind(); 3445 } 3446 // Otherwise, attempt typo correction. 3447 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3448 CTC_NoKeywords, 0)) { 3449 if (R.getAsSingle<NamespaceDecl>() || 3450 R.getAsSingle<NamespaceAliasDecl>()) { 3451 if (DeclContext *DC = computeDeclContext(SS, false)) 3452 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3453 << NamespcName << DC << Corrected << SS.getRange() 3454 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3455 else 3456 Diag(IdentLoc, diag::err_using_directive_suggest) 3457 << NamespcName << Corrected 3458 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3459 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3460 << Corrected; 3461 3462 NamespcName = Corrected.getAsIdentifierInfo(); 3463 } else { 3464 R.clear(); 3465 R.setLookupName(NamespcName); 3466 } 3467 } 3468 } 3469 3470 if (!R.empty()) { 3471 NamedDecl *Named = R.getFoundDecl(); 3472 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3473 && "expected namespace decl"); 3474 // C++ [namespace.udir]p1: 3475 // A using-directive specifies that the names in the nominated 3476 // namespace can be used in the scope in which the 3477 // using-directive appears after the using-directive. During 3478 // unqualified name lookup (3.4.1), the names appear as if they 3479 // were declared in the nearest enclosing namespace which 3480 // contains both the using-directive and the nominated 3481 // namespace. [Note: in this context, "contains" means "contains 3482 // directly or indirectly". ] 3483 3484 // Find enclosing context containing both using-directive and 3485 // nominated namespace. 3486 NamespaceDecl *NS = getNamespaceDecl(Named); 3487 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3488 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3489 CommonAncestor = CommonAncestor->getParent(); 3490 3491 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3492 SS.getRange(), 3493 (NestedNameSpecifier *)SS.getScopeRep(), 3494 IdentLoc, Named, CommonAncestor); 3495 PushUsingDirective(S, UDir); 3496 } else { 3497 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3498 } 3499 3500 // FIXME: We ignore attributes for now. 3501 delete AttrList; 3502 return DeclPtrTy::make(UDir); 3503} 3504 3505void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3506 // If scope has associated entity, then using directive is at namespace 3507 // or translation unit scope. We add UsingDirectiveDecls, into 3508 // it's lookup structure. 3509 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3510 Ctx->addDecl(UDir); 3511 else 3512 // Otherwise it is block-sope. using-directives will affect lookup 3513 // only to the end of scope. 3514 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3515} 3516 3517 3518Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3519 AccessSpecifier AS, 3520 bool HasUsingKeyword, 3521 SourceLocation UsingLoc, 3522 CXXScopeSpec &SS, 3523 UnqualifiedId &Name, 3524 AttributeList *AttrList, 3525 bool IsTypeName, 3526 SourceLocation TypenameLoc) { 3527 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3528 3529 switch (Name.getKind()) { 3530 case UnqualifiedId::IK_Identifier: 3531 case UnqualifiedId::IK_OperatorFunctionId: 3532 case UnqualifiedId::IK_LiteralOperatorId: 3533 case UnqualifiedId::IK_ConversionFunctionId: 3534 break; 3535 3536 case UnqualifiedId::IK_ConstructorName: 3537 case UnqualifiedId::IK_ConstructorTemplateId: 3538 // C++0x inherited constructors. 3539 if (getLangOptions().CPlusPlus0x) break; 3540 3541 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3542 << SS.getRange(); 3543 return DeclPtrTy(); 3544 3545 case UnqualifiedId::IK_DestructorName: 3546 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3547 << SS.getRange(); 3548 return DeclPtrTy(); 3549 3550 case UnqualifiedId::IK_TemplateId: 3551 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3552 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3553 return DeclPtrTy(); 3554 } 3555 3556 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3557 if (!TargetName) 3558 return DeclPtrTy(); 3559 3560 // Warn about using declarations. 3561 // TODO: store that the declaration was written without 'using' and 3562 // talk about access decls instead of using decls in the 3563 // diagnostics. 3564 if (!HasUsingKeyword) { 3565 UsingLoc = Name.getSourceRange().getBegin(); 3566 3567 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3568 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3569 } 3570 3571 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3572 Name.getSourceRange().getBegin(), 3573 TargetName, AttrList, 3574 /* IsInstantiation */ false, 3575 IsTypeName, TypenameLoc); 3576 if (UD) 3577 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3578 3579 return DeclPtrTy::make(UD); 3580} 3581 3582/// Determines whether to create a using shadow decl for a particular 3583/// decl, given the set of decls existing prior to this using lookup. 3584bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3585 const LookupResult &Previous) { 3586 // Diagnose finding a decl which is not from a base class of the 3587 // current class. We do this now because there are cases where this 3588 // function will silently decide not to build a shadow decl, which 3589 // will pre-empt further diagnostics. 3590 // 3591 // We don't need to do this in C++0x because we do the check once on 3592 // the qualifier. 3593 // 3594 // FIXME: diagnose the following if we care enough: 3595 // struct A { int foo; }; 3596 // struct B : A { using A::foo; }; 3597 // template <class T> struct C : A {}; 3598 // template <class T> struct D : C<T> { using B::foo; } // <--- 3599 // This is invalid (during instantiation) in C++03 because B::foo 3600 // resolves to the using decl in B, which is not a base class of D<T>. 3601 // We can't diagnose it immediately because C<T> is an unknown 3602 // specialization. The UsingShadowDecl in D<T> then points directly 3603 // to A::foo, which will look well-formed when we instantiate. 3604 // The right solution is to not collapse the shadow-decl chain. 3605 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3606 DeclContext *OrigDC = Orig->getDeclContext(); 3607 3608 // Handle enums and anonymous structs. 3609 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3610 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3611 while (OrigRec->isAnonymousStructOrUnion()) 3612 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3613 3614 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3615 if (OrigDC == CurContext) { 3616 Diag(Using->getLocation(), 3617 diag::err_using_decl_nested_name_specifier_is_current_class) 3618 << Using->getNestedNameRange(); 3619 Diag(Orig->getLocation(), diag::note_using_decl_target); 3620 return true; 3621 } 3622 3623 Diag(Using->getNestedNameRange().getBegin(), 3624 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3625 << Using->getTargetNestedNameDecl() 3626 << cast<CXXRecordDecl>(CurContext) 3627 << Using->getNestedNameRange(); 3628 Diag(Orig->getLocation(), diag::note_using_decl_target); 3629 return true; 3630 } 3631 } 3632 3633 if (Previous.empty()) return false; 3634 3635 NamedDecl *Target = Orig; 3636 if (isa<UsingShadowDecl>(Target)) 3637 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3638 3639 // If the target happens to be one of the previous declarations, we 3640 // don't have a conflict. 3641 // 3642 // FIXME: but we might be increasing its access, in which case we 3643 // should redeclare it. 3644 NamedDecl *NonTag = 0, *Tag = 0; 3645 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3646 I != E; ++I) { 3647 NamedDecl *D = (*I)->getUnderlyingDecl(); 3648 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3649 return false; 3650 3651 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3652 } 3653 3654 if (Target->isFunctionOrFunctionTemplate()) { 3655 FunctionDecl *FD; 3656 if (isa<FunctionTemplateDecl>(Target)) 3657 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3658 else 3659 FD = cast<FunctionDecl>(Target); 3660 3661 NamedDecl *OldDecl = 0; 3662 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3663 case Ovl_Overload: 3664 return false; 3665 3666 case Ovl_NonFunction: 3667 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3668 break; 3669 3670 // We found a decl with the exact signature. 3671 case Ovl_Match: 3672 // If we're in a record, we want to hide the target, so we 3673 // return true (without a diagnostic) to tell the caller not to 3674 // build a shadow decl. 3675 if (CurContext->isRecord()) 3676 return true; 3677 3678 // If we're not in a record, this is an error. 3679 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3680 break; 3681 } 3682 3683 Diag(Target->getLocation(), diag::note_using_decl_target); 3684 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3685 return true; 3686 } 3687 3688 // Target is not a function. 3689 3690 if (isa<TagDecl>(Target)) { 3691 // No conflict between a tag and a non-tag. 3692 if (!Tag) return false; 3693 3694 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3695 Diag(Target->getLocation(), diag::note_using_decl_target); 3696 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3697 return true; 3698 } 3699 3700 // No conflict between a tag and a non-tag. 3701 if (!NonTag) return false; 3702 3703 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3704 Diag(Target->getLocation(), diag::note_using_decl_target); 3705 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3706 return true; 3707} 3708 3709/// Builds a shadow declaration corresponding to a 'using' declaration. 3710UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3711 UsingDecl *UD, 3712 NamedDecl *Orig) { 3713 3714 // If we resolved to another shadow declaration, just coalesce them. 3715 NamedDecl *Target = Orig; 3716 if (isa<UsingShadowDecl>(Target)) { 3717 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3718 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3719 } 3720 3721 UsingShadowDecl *Shadow 3722 = UsingShadowDecl::Create(Context, CurContext, 3723 UD->getLocation(), UD, Target); 3724 UD->addShadowDecl(Shadow); 3725 3726 if (S) 3727 PushOnScopeChains(Shadow, S); 3728 else 3729 CurContext->addDecl(Shadow); 3730 Shadow->setAccess(UD->getAccess()); 3731 3732 // Register it as a conversion if appropriate. 3733 if (Shadow->getDeclName().getNameKind() 3734 == DeclarationName::CXXConversionFunctionName) 3735 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3736 3737 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3738 Shadow->setInvalidDecl(); 3739 3740 return Shadow; 3741} 3742 3743/// Hides a using shadow declaration. This is required by the current 3744/// using-decl implementation when a resolvable using declaration in a 3745/// class is followed by a declaration which would hide or override 3746/// one or more of the using decl's targets; for example: 3747/// 3748/// struct Base { void foo(int); }; 3749/// struct Derived : Base { 3750/// using Base::foo; 3751/// void foo(int); 3752/// }; 3753/// 3754/// The governing language is C++03 [namespace.udecl]p12: 3755/// 3756/// When a using-declaration brings names from a base class into a 3757/// derived class scope, member functions in the derived class 3758/// override and/or hide member functions with the same name and 3759/// parameter types in a base class (rather than conflicting). 3760/// 3761/// There are two ways to implement this: 3762/// (1) optimistically create shadow decls when they're not hidden 3763/// by existing declarations, or 3764/// (2) don't create any shadow decls (or at least don't make them 3765/// visible) until we've fully parsed/instantiated the class. 3766/// The problem with (1) is that we might have to retroactively remove 3767/// a shadow decl, which requires several O(n) operations because the 3768/// decl structures are (very reasonably) not designed for removal. 3769/// (2) avoids this but is very fiddly and phase-dependent. 3770void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3771 if (Shadow->getDeclName().getNameKind() == 3772 DeclarationName::CXXConversionFunctionName) 3773 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3774 3775 // Remove it from the DeclContext... 3776 Shadow->getDeclContext()->removeDecl(Shadow); 3777 3778 // ...and the scope, if applicable... 3779 if (S) { 3780 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3781 IdResolver.RemoveDecl(Shadow); 3782 } 3783 3784 // ...and the using decl. 3785 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3786 3787 // TODO: complain somehow if Shadow was used. It shouldn't 3788 // be possible for this to happen, because...? 3789} 3790 3791/// Builds a using declaration. 3792/// 3793/// \param IsInstantiation - Whether this call arises from an 3794/// instantiation of an unresolved using declaration. We treat 3795/// the lookup differently for these declarations. 3796NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3797 SourceLocation UsingLoc, 3798 CXXScopeSpec &SS, 3799 SourceLocation IdentLoc, 3800 DeclarationName Name, 3801 AttributeList *AttrList, 3802 bool IsInstantiation, 3803 bool IsTypeName, 3804 SourceLocation TypenameLoc) { 3805 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3806 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3807 3808 // FIXME: We ignore attributes for now. 3809 delete AttrList; 3810 3811 if (SS.isEmpty()) { 3812 Diag(IdentLoc, diag::err_using_requires_qualname); 3813 return 0; 3814 } 3815 3816 // Do the redeclaration lookup in the current scope. 3817 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3818 ForRedeclaration); 3819 Previous.setHideTags(false); 3820 if (S) { 3821 LookupName(Previous, S); 3822 3823 // It is really dumb that we have to do this. 3824 LookupResult::Filter F = Previous.makeFilter(); 3825 while (F.hasNext()) { 3826 NamedDecl *D = F.next(); 3827 if (!isDeclInScope(D, CurContext, S)) 3828 F.erase(); 3829 } 3830 F.done(); 3831 } else { 3832 assert(IsInstantiation && "no scope in non-instantiation"); 3833 assert(CurContext->isRecord() && "scope not record in instantiation"); 3834 LookupQualifiedName(Previous, CurContext); 3835 } 3836 3837 NestedNameSpecifier *NNS = 3838 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3839 3840 // Check for invalid redeclarations. 3841 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3842 return 0; 3843 3844 // Check for bad qualifiers. 3845 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3846 return 0; 3847 3848 DeclContext *LookupContext = computeDeclContext(SS); 3849 NamedDecl *D; 3850 if (!LookupContext) { 3851 if (IsTypeName) { 3852 // FIXME: not all declaration name kinds are legal here 3853 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3854 UsingLoc, TypenameLoc, 3855 SS.getRange(), NNS, 3856 IdentLoc, Name); 3857 } else { 3858 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3859 UsingLoc, SS.getRange(), NNS, 3860 IdentLoc, Name); 3861 } 3862 } else { 3863 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3864 SS.getRange(), UsingLoc, NNS, Name, 3865 IsTypeName); 3866 } 3867 D->setAccess(AS); 3868 CurContext->addDecl(D); 3869 3870 if (!LookupContext) return D; 3871 UsingDecl *UD = cast<UsingDecl>(D); 3872 3873 if (RequireCompleteDeclContext(SS, LookupContext)) { 3874 UD->setInvalidDecl(); 3875 return UD; 3876 } 3877 3878 // Look up the target name. 3879 3880 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3881 3882 // Unlike most lookups, we don't always want to hide tag 3883 // declarations: tag names are visible through the using declaration 3884 // even if hidden by ordinary names, *except* in a dependent context 3885 // where it's important for the sanity of two-phase lookup. 3886 if (!IsInstantiation) 3887 R.setHideTags(false); 3888 3889 LookupQualifiedName(R, LookupContext); 3890 3891 if (R.empty()) { 3892 Diag(IdentLoc, diag::err_no_member) 3893 << Name << LookupContext << SS.getRange(); 3894 UD->setInvalidDecl(); 3895 return UD; 3896 } 3897 3898 if (R.isAmbiguous()) { 3899 UD->setInvalidDecl(); 3900 return UD; 3901 } 3902 3903 if (IsTypeName) { 3904 // If we asked for a typename and got a non-type decl, error out. 3905 if (!R.getAsSingle<TypeDecl>()) { 3906 Diag(IdentLoc, diag::err_using_typename_non_type); 3907 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3908 Diag((*I)->getUnderlyingDecl()->getLocation(), 3909 diag::note_using_decl_target); 3910 UD->setInvalidDecl(); 3911 return UD; 3912 } 3913 } else { 3914 // If we asked for a non-typename and we got a type, error out, 3915 // but only if this is an instantiation of an unresolved using 3916 // decl. Otherwise just silently find the type name. 3917 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3918 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3919 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3920 UD->setInvalidDecl(); 3921 return UD; 3922 } 3923 } 3924 3925 // C++0x N2914 [namespace.udecl]p6: 3926 // A using-declaration shall not name a namespace. 3927 if (R.getAsSingle<NamespaceDecl>()) { 3928 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3929 << SS.getRange(); 3930 UD->setInvalidDecl(); 3931 return UD; 3932 } 3933 3934 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3935 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3936 BuildUsingShadowDecl(S, UD, *I); 3937 } 3938 3939 return UD; 3940} 3941 3942/// Checks that the given using declaration is not an invalid 3943/// redeclaration. Note that this is checking only for the using decl 3944/// itself, not for any ill-formedness among the UsingShadowDecls. 3945bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3946 bool isTypeName, 3947 const CXXScopeSpec &SS, 3948 SourceLocation NameLoc, 3949 const LookupResult &Prev) { 3950 // C++03 [namespace.udecl]p8: 3951 // C++0x [namespace.udecl]p10: 3952 // A using-declaration is a declaration and can therefore be used 3953 // repeatedly where (and only where) multiple declarations are 3954 // allowed. 3955 // 3956 // That's in non-member contexts. 3957 if (!CurContext->getLookupContext()->isRecord()) 3958 return false; 3959 3960 NestedNameSpecifier *Qual 3961 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3962 3963 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3964 NamedDecl *D = *I; 3965 3966 bool DTypename; 3967 NestedNameSpecifier *DQual; 3968 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3969 DTypename = UD->isTypeName(); 3970 DQual = UD->getTargetNestedNameDecl(); 3971 } else if (UnresolvedUsingValueDecl *UD 3972 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3973 DTypename = false; 3974 DQual = UD->getTargetNestedNameSpecifier(); 3975 } else if (UnresolvedUsingTypenameDecl *UD 3976 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3977 DTypename = true; 3978 DQual = UD->getTargetNestedNameSpecifier(); 3979 } else continue; 3980 3981 // using decls differ if one says 'typename' and the other doesn't. 3982 // FIXME: non-dependent using decls? 3983 if (isTypeName != DTypename) continue; 3984 3985 // using decls differ if they name different scopes (but note that 3986 // template instantiation can cause this check to trigger when it 3987 // didn't before instantiation). 3988 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3989 Context.getCanonicalNestedNameSpecifier(DQual)) 3990 continue; 3991 3992 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3993 Diag(D->getLocation(), diag::note_using_decl) << 1; 3994 return true; 3995 } 3996 3997 return false; 3998} 3999 4000 4001/// Checks that the given nested-name qualifier used in a using decl 4002/// in the current context is appropriately related to the current 4003/// scope. If an error is found, diagnoses it and returns true. 4004bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4005 const CXXScopeSpec &SS, 4006 SourceLocation NameLoc) { 4007 DeclContext *NamedContext = computeDeclContext(SS); 4008 4009 if (!CurContext->isRecord()) { 4010 // C++03 [namespace.udecl]p3: 4011 // C++0x [namespace.udecl]p8: 4012 // A using-declaration for a class member shall be a member-declaration. 4013 4014 // If we weren't able to compute a valid scope, it must be a 4015 // dependent class scope. 4016 if (!NamedContext || NamedContext->isRecord()) { 4017 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4018 << SS.getRange(); 4019 return true; 4020 } 4021 4022 // Otherwise, everything is known to be fine. 4023 return false; 4024 } 4025 4026 // The current scope is a record. 4027 4028 // If the named context is dependent, we can't decide much. 4029 if (!NamedContext) { 4030 // FIXME: in C++0x, we can diagnose if we can prove that the 4031 // nested-name-specifier does not refer to a base class, which is 4032 // still possible in some cases. 4033 4034 // Otherwise we have to conservatively report that things might be 4035 // okay. 4036 return false; 4037 } 4038 4039 if (!NamedContext->isRecord()) { 4040 // Ideally this would point at the last name in the specifier, 4041 // but we don't have that level of source info. 4042 Diag(SS.getRange().getBegin(), 4043 diag::err_using_decl_nested_name_specifier_is_not_class) 4044 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4045 return true; 4046 } 4047 4048 if (getLangOptions().CPlusPlus0x) { 4049 // C++0x [namespace.udecl]p3: 4050 // In a using-declaration used as a member-declaration, the 4051 // nested-name-specifier shall name a base class of the class 4052 // being defined. 4053 4054 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4055 cast<CXXRecordDecl>(NamedContext))) { 4056 if (CurContext == NamedContext) { 4057 Diag(NameLoc, 4058 diag::err_using_decl_nested_name_specifier_is_current_class) 4059 << SS.getRange(); 4060 return true; 4061 } 4062 4063 Diag(SS.getRange().getBegin(), 4064 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4065 << (NestedNameSpecifier*) SS.getScopeRep() 4066 << cast<CXXRecordDecl>(CurContext) 4067 << SS.getRange(); 4068 return true; 4069 } 4070 4071 return false; 4072 } 4073 4074 // C++03 [namespace.udecl]p4: 4075 // A using-declaration used as a member-declaration shall refer 4076 // to a member of a base class of the class being defined [etc.]. 4077 4078 // Salient point: SS doesn't have to name a base class as long as 4079 // lookup only finds members from base classes. Therefore we can 4080 // diagnose here only if we can prove that that can't happen, 4081 // i.e. if the class hierarchies provably don't intersect. 4082 4083 // TODO: it would be nice if "definitely valid" results were cached 4084 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4085 // need to be repeated. 4086 4087 struct UserData { 4088 llvm::DenseSet<const CXXRecordDecl*> Bases; 4089 4090 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4091 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4092 Data->Bases.insert(Base); 4093 return true; 4094 } 4095 4096 bool hasDependentBases(const CXXRecordDecl *Class) { 4097 return !Class->forallBases(collect, this); 4098 } 4099 4100 /// Returns true if the base is dependent or is one of the 4101 /// accumulated base classes. 4102 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4103 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4104 return !Data->Bases.count(Base); 4105 } 4106 4107 bool mightShareBases(const CXXRecordDecl *Class) { 4108 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4109 } 4110 }; 4111 4112 UserData Data; 4113 4114 // Returns false if we find a dependent base. 4115 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4116 return false; 4117 4118 // Returns false if the class has a dependent base or if it or one 4119 // of its bases is present in the base set of the current context. 4120 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4121 return false; 4122 4123 Diag(SS.getRange().getBegin(), 4124 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4125 << (NestedNameSpecifier*) SS.getScopeRep() 4126 << cast<CXXRecordDecl>(CurContext) 4127 << SS.getRange(); 4128 4129 return true; 4130} 4131 4132Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4133 SourceLocation NamespaceLoc, 4134 SourceLocation AliasLoc, 4135 IdentifierInfo *Alias, 4136 CXXScopeSpec &SS, 4137 SourceLocation IdentLoc, 4138 IdentifierInfo *Ident) { 4139 4140 // Lookup the namespace name. 4141 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4142 LookupParsedName(R, S, &SS); 4143 4144 // Check if we have a previous declaration with the same name. 4145 NamedDecl *PrevDecl 4146 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4147 ForRedeclaration); 4148 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4149 PrevDecl = 0; 4150 4151 if (PrevDecl) { 4152 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4153 // We already have an alias with the same name that points to the same 4154 // namespace, so don't create a new one. 4155 // FIXME: At some point, we'll want to create the (redundant) 4156 // declaration to maintain better source information. 4157 if (!R.isAmbiguous() && !R.empty() && 4158 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4159 return DeclPtrTy(); 4160 } 4161 4162 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4163 diag::err_redefinition_different_kind; 4164 Diag(AliasLoc, DiagID) << Alias; 4165 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4166 return DeclPtrTy(); 4167 } 4168 4169 if (R.isAmbiguous()) 4170 return DeclPtrTy(); 4171 4172 if (R.empty()) { 4173 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4174 CTC_NoKeywords, 0)) { 4175 if (R.getAsSingle<NamespaceDecl>() || 4176 R.getAsSingle<NamespaceAliasDecl>()) { 4177 if (DeclContext *DC = computeDeclContext(SS, false)) 4178 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4179 << Ident << DC << Corrected << SS.getRange() 4180 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4181 else 4182 Diag(IdentLoc, diag::err_using_directive_suggest) 4183 << Ident << Corrected 4184 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4185 4186 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4187 << Corrected; 4188 4189 Ident = Corrected.getAsIdentifierInfo(); 4190 } else { 4191 R.clear(); 4192 R.setLookupName(Ident); 4193 } 4194 } 4195 4196 if (R.empty()) { 4197 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4198 return DeclPtrTy(); 4199 } 4200 } 4201 4202 NamespaceAliasDecl *AliasDecl = 4203 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4204 Alias, SS.getRange(), 4205 (NestedNameSpecifier *)SS.getScopeRep(), 4206 IdentLoc, R.getFoundDecl()); 4207 4208 PushOnScopeChains(AliasDecl, S); 4209 return DeclPtrTy::make(AliasDecl); 4210} 4211 4212namespace { 4213 /// \brief Scoped object used to handle the state changes required in Sema 4214 /// to implicitly define the body of a C++ member function; 4215 class ImplicitlyDefinedFunctionScope { 4216 Sema &S; 4217 DeclContext *PreviousContext; 4218 4219 public: 4220 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4221 : S(S), PreviousContext(S.CurContext) 4222 { 4223 S.CurContext = Method; 4224 S.PushFunctionScope(); 4225 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4226 } 4227 4228 ~ImplicitlyDefinedFunctionScope() { 4229 S.PopExpressionEvaluationContext(); 4230 S.PopFunctionOrBlockScope(); 4231 S.CurContext = PreviousContext; 4232 } 4233 }; 4234} 4235 4236void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4237 CXXConstructorDecl *Constructor) { 4238 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4239 !Constructor->isUsed(false)) && 4240 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4241 4242 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4243 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4244 4245 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4246 ErrorTrap Trap(*this); 4247 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4248 Trap.hasErrorOccurred()) { 4249 Diag(CurrentLocation, diag::note_member_synthesized_at) 4250 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4251 Constructor->setInvalidDecl(); 4252 } else { 4253 Constructor->setUsed(); 4254 MarkVTableUsed(CurrentLocation, ClassDecl); 4255 } 4256} 4257 4258void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4259 CXXDestructorDecl *Destructor) { 4260 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4261 "DefineImplicitDestructor - call it for implicit default dtor"); 4262 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4263 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4264 4265 if (Destructor->isInvalidDecl()) 4266 return; 4267 4268 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4269 4270 ErrorTrap Trap(*this); 4271 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4272 Destructor->getParent()); 4273 4274 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4275 Diag(CurrentLocation, diag::note_member_synthesized_at) 4276 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4277 4278 Destructor->setInvalidDecl(); 4279 return; 4280 } 4281 4282 Destructor->setUsed(); 4283 MarkVTableUsed(CurrentLocation, ClassDecl); 4284} 4285 4286/// \brief Builds a statement that copies the given entity from \p From to 4287/// \c To. 4288/// 4289/// This routine is used to copy the members of a class with an 4290/// implicitly-declared copy assignment operator. When the entities being 4291/// copied are arrays, this routine builds for loops to copy them. 4292/// 4293/// \param S The Sema object used for type-checking. 4294/// 4295/// \param Loc The location where the implicit copy is being generated. 4296/// 4297/// \param T The type of the expressions being copied. Both expressions must 4298/// have this type. 4299/// 4300/// \param To The expression we are copying to. 4301/// 4302/// \param From The expression we are copying from. 4303/// 4304/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4305/// Otherwise, it's a non-static member subobject. 4306/// 4307/// \param Depth Internal parameter recording the depth of the recursion. 4308/// 4309/// \returns A statement or a loop that copies the expressions. 4310static Sema::OwningStmtResult 4311BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4312 Sema::OwningExprResult To, Sema::OwningExprResult From, 4313 bool CopyingBaseSubobject, unsigned Depth = 0) { 4314 typedef Sema::OwningStmtResult OwningStmtResult; 4315 typedef Sema::OwningExprResult OwningExprResult; 4316 4317 // C++0x [class.copy]p30: 4318 // Each subobject is assigned in the manner appropriate to its type: 4319 // 4320 // - if the subobject is of class type, the copy assignment operator 4321 // for the class is used (as if by explicit qualification; that is, 4322 // ignoring any possible virtual overriding functions in more derived 4323 // classes); 4324 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4325 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4326 4327 // Look for operator=. 4328 DeclarationName Name 4329 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4330 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4331 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4332 4333 // Filter out any result that isn't a copy-assignment operator. 4334 LookupResult::Filter F = OpLookup.makeFilter(); 4335 while (F.hasNext()) { 4336 NamedDecl *D = F.next(); 4337 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4338 if (Method->isCopyAssignmentOperator()) 4339 continue; 4340 4341 F.erase(); 4342 } 4343 F.done(); 4344 4345 // Suppress the protected check (C++ [class.protected]) for each of the 4346 // assignment operators we found. This strange dance is required when 4347 // we're assigning via a base classes's copy-assignment operator. To 4348 // ensure that we're getting the right base class subobject (without 4349 // ambiguities), we need to cast "this" to that subobject type; to 4350 // ensure that we don't go through the virtual call mechanism, we need 4351 // to qualify the operator= name with the base class (see below). However, 4352 // this means that if the base class has a protected copy assignment 4353 // operator, the protected member access check will fail. So, we 4354 // rewrite "protected" access to "public" access in this case, since we 4355 // know by construction that we're calling from a derived class. 4356 if (CopyingBaseSubobject) { 4357 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4358 L != LEnd; ++L) { 4359 if (L.getAccess() == AS_protected) 4360 L.setAccess(AS_public); 4361 } 4362 } 4363 4364 // Create the nested-name-specifier that will be used to qualify the 4365 // reference to operator=; this is required to suppress the virtual 4366 // call mechanism. 4367 CXXScopeSpec SS; 4368 SS.setRange(Loc); 4369 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4370 T.getTypePtr())); 4371 4372 // Create the reference to operator=. 4373 OwningExprResult OpEqualRef 4374 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4375 /*FirstQualifierInScope=*/0, OpLookup, 4376 /*TemplateArgs=*/0, 4377 /*SuppressQualifierCheck=*/true); 4378 if (OpEqualRef.isInvalid()) 4379 return S.StmtError(); 4380 4381 // Build the call to the assignment operator. 4382 Expr *FromE = From.takeAs<Expr>(); 4383 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4384 OpEqualRef.takeAs<Expr>(), 4385 Loc, &FromE, 1, 0, Loc); 4386 if (Call.isInvalid()) 4387 return S.StmtError(); 4388 4389 return S.Owned(Call.takeAs<Stmt>()); 4390 } 4391 4392 // - if the subobject is of scalar type, the built-in assignment 4393 // operator is used. 4394 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4395 if (!ArrayTy) { 4396 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4397 BinaryOperator::Assign, 4398 To.takeAs<Expr>(), 4399 From.takeAs<Expr>()); 4400 if (Assignment.isInvalid()) 4401 return S.StmtError(); 4402 4403 return S.Owned(Assignment.takeAs<Stmt>()); 4404 } 4405 4406 // - if the subobject is an array, each element is assigned, in the 4407 // manner appropriate to the element type; 4408 4409 // Construct a loop over the array bounds, e.g., 4410 // 4411 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4412 // 4413 // that will copy each of the array elements. 4414 QualType SizeType = S.Context.getSizeType(); 4415 4416 // Create the iteration variable. 4417 IdentifierInfo *IterationVarName = 0; 4418 { 4419 llvm::SmallString<8> Str; 4420 llvm::raw_svector_ostream OS(Str); 4421 OS << "__i" << Depth; 4422 IterationVarName = &S.Context.Idents.get(OS.str()); 4423 } 4424 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4425 IterationVarName, SizeType, 4426 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4427 VarDecl::None, VarDecl::None); 4428 4429 // Initialize the iteration variable to zero. 4430 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4431 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4432 4433 // Create a reference to the iteration variable; we'll use this several 4434 // times throughout. 4435 Expr *IterationVarRef 4436 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4437 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4438 4439 // Create the DeclStmt that holds the iteration variable. 4440 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4441 4442 // Create the comparison against the array bound. 4443 llvm::APInt Upper = ArrayTy->getSize(); 4444 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4445 OwningExprResult Comparison 4446 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4447 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4448 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4449 4450 // Create the pre-increment of the iteration variable. 4451 OwningExprResult Increment 4452 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4453 UnaryOperator::PreInc, 4454 SizeType, Loc)); 4455 4456 // Subscript the "from" and "to" expressions with the iteration variable. 4457 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4458 S.Owned(IterationVarRef->Retain()), 4459 Loc); 4460 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4461 S.Owned(IterationVarRef->Retain()), 4462 Loc); 4463 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4464 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4465 4466 // Build the copy for an individual element of the array. 4467 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4468 ArrayTy->getElementType(), 4469 move(To), move(From), 4470 CopyingBaseSubobject, Depth+1); 4471 if (Copy.isInvalid()) { 4472 InitStmt->Destroy(S.Context); 4473 return S.StmtError(); 4474 } 4475 4476 // Construct the loop that copies all elements of this array. 4477 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4478 S.MakeFullExpr(Comparison), 4479 Sema::DeclPtrTy(), 4480 S.MakeFullExpr(Increment), 4481 Loc, move(Copy)); 4482} 4483 4484CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(Scope *S, 4485 CXXRecordDecl *ClassDecl) { 4486 // Note: The following rules are largely analoguous to the copy 4487 // constructor rules. Note that virtual bases are not taken into account 4488 // for determining the argument type of the operator. Note also that 4489 // operators taking an object instead of a reference are allowed. 4490 // 4491 // C++ [class.copy]p10: 4492 // If the class definition does not explicitly declare a copy 4493 // assignment operator, one is declared implicitly. 4494 // The implicitly-defined copy assignment operator for a class X 4495 // will have the form 4496 // 4497 // X& X::operator=(const X&) 4498 // 4499 // if 4500 bool HasConstCopyAssignment = true; 4501 4502 // -- each direct base class B of X has a copy assignment operator 4503 // whose parameter is of type const B&, const volatile B& or B, 4504 // and 4505 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4506 BaseEnd = ClassDecl->bases_end(); 4507 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4508 assert(!Base->getType()->isDependentType() && 4509 "Cannot generate implicit members for class with dependent bases."); 4510 const CXXRecordDecl *BaseClassDecl 4511 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4512 const CXXMethodDecl *MD = 0; 4513 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 4514 MD); 4515 } 4516 4517 // -- for all the nonstatic data members of X that are of a class 4518 // type M (or array thereof), each such class type has a copy 4519 // assignment operator whose parameter is of type const M&, 4520 // const volatile M& or M. 4521 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4522 FieldEnd = ClassDecl->field_end(); 4523 HasConstCopyAssignment && Field != FieldEnd; 4524 ++Field) { 4525 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4526 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4527 const CXXRecordDecl *FieldClassDecl 4528 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4529 const CXXMethodDecl *MD = 0; 4530 HasConstCopyAssignment 4531 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 4532 } 4533 } 4534 4535 // Otherwise, the implicitly declared copy assignment operator will 4536 // have the form 4537 // 4538 // X& X::operator=(X&) 4539 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4540 QualType RetType = Context.getLValueReferenceType(ArgType); 4541 if (HasConstCopyAssignment) 4542 ArgType = ArgType.withConst(); 4543 ArgType = Context.getLValueReferenceType(ArgType); 4544 4545 // C++ [except.spec]p14: 4546 // An implicitly declared special member function (Clause 12) shall have an 4547 // exception-specification. [...] 4548 ImplicitExceptionSpecification ExceptSpec(Context); 4549 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4550 BaseEnd = ClassDecl->bases_end(); 4551 Base != BaseEnd; ++Base) { 4552 const CXXRecordDecl *BaseClassDecl 4553 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4554 if (CXXMethodDecl *CopyAssign 4555 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4556 ExceptSpec.CalledDecl(CopyAssign); 4557 } 4558 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4559 FieldEnd = ClassDecl->field_end(); 4560 Field != FieldEnd; 4561 ++Field) { 4562 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4563 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4564 const CXXRecordDecl *FieldClassDecl 4565 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4566 if (CXXMethodDecl *CopyAssign 4567 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4568 ExceptSpec.CalledDecl(CopyAssign); 4569 } 4570 } 4571 4572 // An implicitly-declared copy assignment operator is an inline public 4573 // member of its class. 4574 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4575 CXXMethodDecl *CopyAssignment 4576 = CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 4577 Context.getFunctionType(RetType, &ArgType, 1, 4578 false, 0, 4579 ExceptSpec.hasExceptionSpecification(), 4580 ExceptSpec.hasAnyExceptionSpecification(), 4581 ExceptSpec.size(), 4582 ExceptSpec.data(), 4583 FunctionType::ExtInfo()), 4584 /*TInfo=*/0, /*isStatic=*/false, 4585 /*StorageClassAsWritten=*/FunctionDecl::None, 4586 /*isInline=*/true); 4587 CopyAssignment->setAccess(AS_public); 4588 CopyAssignment->setImplicit(); 4589 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4590 CopyAssignment->setCopyAssignment(true); 4591 4592 // Add the parameter to the operator. 4593 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4594 ClassDecl->getLocation(), 4595 /*Id=*/0, 4596 ArgType, /*TInfo=*/0, 4597 VarDecl::None, 4598 VarDecl::None, 0); 4599 CopyAssignment->setParams(&FromParam, 1); 4600 4601 // Don't call addedAssignmentOperator. The class does not need to know about 4602 // the implicitly-declared copy assignment operator. 4603 if (S) 4604 PushOnScopeChains(CopyAssignment, S, true); 4605 else 4606 ClassDecl->addDecl(CopyAssignment); 4607 4608 AddOverriddenMethods(ClassDecl, CopyAssignment); 4609 return CopyAssignment; 4610} 4611 4612void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4613 CXXMethodDecl *CopyAssignOperator) { 4614 assert((CopyAssignOperator->isImplicit() && 4615 CopyAssignOperator->isOverloadedOperator() && 4616 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4617 !CopyAssignOperator->isUsed(false)) && 4618 "DefineImplicitCopyAssignment called for wrong function"); 4619 4620 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4621 4622 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4623 CopyAssignOperator->setInvalidDecl(); 4624 return; 4625 } 4626 4627 CopyAssignOperator->setUsed(); 4628 4629 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4630 ErrorTrap Trap(*this); 4631 4632 // C++0x [class.copy]p30: 4633 // The implicitly-defined or explicitly-defaulted copy assignment operator 4634 // for a non-union class X performs memberwise copy assignment of its 4635 // subobjects. The direct base classes of X are assigned first, in the 4636 // order of their declaration in the base-specifier-list, and then the 4637 // immediate non-static data members of X are assigned, in the order in 4638 // which they were declared in the class definition. 4639 4640 // The statements that form the synthesized function body. 4641 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4642 4643 // The parameter for the "other" object, which we are copying from. 4644 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4645 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4646 QualType OtherRefType = Other->getType(); 4647 if (const LValueReferenceType *OtherRef 4648 = OtherRefType->getAs<LValueReferenceType>()) { 4649 OtherRefType = OtherRef->getPointeeType(); 4650 OtherQuals = OtherRefType.getQualifiers(); 4651 } 4652 4653 // Our location for everything implicitly-generated. 4654 SourceLocation Loc = CopyAssignOperator->getLocation(); 4655 4656 // Construct a reference to the "other" object. We'll be using this 4657 // throughout the generated ASTs. 4658 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4659 assert(OtherRef && "Reference to parameter cannot fail!"); 4660 4661 // Construct the "this" pointer. We'll be using this throughout the generated 4662 // ASTs. 4663 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4664 assert(This && "Reference to this cannot fail!"); 4665 4666 // Assign base classes. 4667 bool Invalid = false; 4668 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4669 E = ClassDecl->bases_end(); Base != E; ++Base) { 4670 // Form the assignment: 4671 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4672 QualType BaseType = Base->getType().getUnqualifiedType(); 4673 CXXRecordDecl *BaseClassDecl = 0; 4674 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4675 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4676 else { 4677 Invalid = true; 4678 continue; 4679 } 4680 4681 // Construct the "from" expression, which is an implicit cast to the 4682 // appropriately-qualified base type. 4683 Expr *From = OtherRef->Retain(); 4684 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4685 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4686 CXXBaseSpecifierArray(Base)); 4687 4688 // Dereference "this". 4689 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4690 Owned(This->Retain())); 4691 4692 // Implicitly cast "this" to the appropriately-qualified base type. 4693 Expr *ToE = To.takeAs<Expr>(); 4694 ImpCastExprToType(ToE, 4695 Context.getCVRQualifiedType(BaseType, 4696 CopyAssignOperator->getTypeQualifiers()), 4697 CastExpr::CK_UncheckedDerivedToBase, 4698 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4699 To = Owned(ToE); 4700 4701 // Build the copy. 4702 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4703 move(To), Owned(From), 4704 /*CopyingBaseSubobject=*/true); 4705 if (Copy.isInvalid()) { 4706 Diag(CurrentLocation, diag::note_member_synthesized_at) 4707 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4708 CopyAssignOperator->setInvalidDecl(); 4709 return; 4710 } 4711 4712 // Success! Record the copy. 4713 Statements.push_back(Copy.takeAs<Expr>()); 4714 } 4715 4716 // \brief Reference to the __builtin_memcpy function. 4717 Expr *BuiltinMemCpyRef = 0; 4718 // \brief Reference to the __builtin_objc_memmove_collectable function. 4719 Expr *CollectableMemCpyRef = 0; 4720 4721 // Assign non-static members. 4722 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4723 FieldEnd = ClassDecl->field_end(); 4724 Field != FieldEnd; ++Field) { 4725 // Check for members of reference type; we can't copy those. 4726 if (Field->getType()->isReferenceType()) { 4727 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4728 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4729 Diag(Field->getLocation(), diag::note_declared_at); 4730 Diag(CurrentLocation, diag::note_member_synthesized_at) 4731 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4732 Invalid = true; 4733 continue; 4734 } 4735 4736 // Check for members of const-qualified, non-class type. 4737 QualType BaseType = Context.getBaseElementType(Field->getType()); 4738 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4739 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4740 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4741 Diag(Field->getLocation(), diag::note_declared_at); 4742 Diag(CurrentLocation, diag::note_member_synthesized_at) 4743 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4744 Invalid = true; 4745 continue; 4746 } 4747 4748 QualType FieldType = Field->getType().getNonReferenceType(); 4749 if (FieldType->isIncompleteArrayType()) { 4750 assert(ClassDecl->hasFlexibleArrayMember() && 4751 "Incomplete array type is not valid"); 4752 continue; 4753 } 4754 4755 // Build references to the field in the object we're copying from and to. 4756 CXXScopeSpec SS; // Intentionally empty 4757 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4758 LookupMemberName); 4759 MemberLookup.addDecl(*Field); 4760 MemberLookup.resolveKind(); 4761 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4762 OtherRefType, 4763 Loc, /*IsArrow=*/false, 4764 SS, 0, MemberLookup, 0); 4765 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4766 This->getType(), 4767 Loc, /*IsArrow=*/true, 4768 SS, 0, MemberLookup, 0); 4769 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4770 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4771 4772 // If the field should be copied with __builtin_memcpy rather than via 4773 // explicit assignments, do so. This optimization only applies for arrays 4774 // of scalars and arrays of class type with trivial copy-assignment 4775 // operators. 4776 if (FieldType->isArrayType() && 4777 (!BaseType->isRecordType() || 4778 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4779 ->hasTrivialCopyAssignment())) { 4780 // Compute the size of the memory buffer to be copied. 4781 QualType SizeType = Context.getSizeType(); 4782 llvm::APInt Size(Context.getTypeSize(SizeType), 4783 Context.getTypeSizeInChars(BaseType).getQuantity()); 4784 for (const ConstantArrayType *Array 4785 = Context.getAsConstantArrayType(FieldType); 4786 Array; 4787 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4788 llvm::APInt ArraySize = Array->getSize(); 4789 ArraySize.zextOrTrunc(Size.getBitWidth()); 4790 Size *= ArraySize; 4791 } 4792 4793 // Take the address of the field references for "from" and "to". 4794 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4795 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4796 4797 bool NeedsCollectableMemCpy = 4798 (BaseType->isRecordType() && 4799 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4800 4801 if (NeedsCollectableMemCpy) { 4802 if (!CollectableMemCpyRef) { 4803 // Create a reference to the __builtin_objc_memmove_collectable function. 4804 LookupResult R(*this, 4805 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4806 Loc, LookupOrdinaryName); 4807 LookupName(R, TUScope, true); 4808 4809 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4810 if (!CollectableMemCpy) { 4811 // Something went horribly wrong earlier, and we will have 4812 // complained about it. 4813 Invalid = true; 4814 continue; 4815 } 4816 4817 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4818 CollectableMemCpy->getType(), 4819 Loc, 0).takeAs<Expr>(); 4820 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4821 } 4822 } 4823 // Create a reference to the __builtin_memcpy builtin function. 4824 else if (!BuiltinMemCpyRef) { 4825 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4826 LookupOrdinaryName); 4827 LookupName(R, TUScope, true); 4828 4829 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4830 if (!BuiltinMemCpy) { 4831 // Something went horribly wrong earlier, and we will have complained 4832 // about it. 4833 Invalid = true; 4834 continue; 4835 } 4836 4837 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4838 BuiltinMemCpy->getType(), 4839 Loc, 0).takeAs<Expr>(); 4840 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4841 } 4842 4843 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4844 CallArgs.push_back(To.takeAs<Expr>()); 4845 CallArgs.push_back(From.takeAs<Expr>()); 4846 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4847 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4848 Commas.push_back(Loc); 4849 Commas.push_back(Loc); 4850 OwningExprResult Call = ExprError(); 4851 if (NeedsCollectableMemCpy) 4852 Call = ActOnCallExpr(/*Scope=*/0, 4853 Owned(CollectableMemCpyRef->Retain()), 4854 Loc, move_arg(CallArgs), 4855 Commas.data(), Loc); 4856 else 4857 Call = ActOnCallExpr(/*Scope=*/0, 4858 Owned(BuiltinMemCpyRef->Retain()), 4859 Loc, move_arg(CallArgs), 4860 Commas.data(), Loc); 4861 4862 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4863 Statements.push_back(Call.takeAs<Expr>()); 4864 continue; 4865 } 4866 4867 // Build the copy of this field. 4868 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4869 move(To), move(From), 4870 /*CopyingBaseSubobject=*/false); 4871 if (Copy.isInvalid()) { 4872 Diag(CurrentLocation, diag::note_member_synthesized_at) 4873 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4874 CopyAssignOperator->setInvalidDecl(); 4875 return; 4876 } 4877 4878 // Success! Record the copy. 4879 Statements.push_back(Copy.takeAs<Stmt>()); 4880 } 4881 4882 if (!Invalid) { 4883 // Add a "return *this;" 4884 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4885 Owned(This->Retain())); 4886 4887 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4888 if (Return.isInvalid()) 4889 Invalid = true; 4890 else { 4891 Statements.push_back(Return.takeAs<Stmt>()); 4892 4893 if (Trap.hasErrorOccurred()) { 4894 Diag(CurrentLocation, diag::note_member_synthesized_at) 4895 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4896 Invalid = true; 4897 } 4898 } 4899 } 4900 4901 if (Invalid) { 4902 CopyAssignOperator->setInvalidDecl(); 4903 return; 4904 } 4905 4906 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4907 /*isStmtExpr=*/false); 4908 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4909 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4910} 4911 4912CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor(Scope *S, 4913 CXXRecordDecl *ClassDecl) { 4914 // C++ [class.copy]p4: 4915 // If the class definition does not explicitly declare a copy 4916 // constructor, one is declared implicitly. 4917 4918 // FIXME: virtual bases! 4919 4920 // C++ [class.copy]p5: 4921 // The implicitly-declared copy constructor for a class X will 4922 // have the form 4923 // 4924 // X::X(const X&) 4925 // 4926 // if 4927 bool HasConstCopyConstructor = true; 4928 4929 // -- each direct or virtual base class B of X has a copy 4930 // constructor whose first parameter is of type const B& or 4931 // const volatile B&, and 4932 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4933 BaseEnd = ClassDecl->bases_end(); 4934 HasConstCopyConstructor && Base != BaseEnd; 4935 ++Base) { 4936 const CXXRecordDecl *BaseClassDecl 4937 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4938 HasConstCopyConstructor 4939 = BaseClassDecl->hasConstCopyConstructor(Context); 4940 } 4941 4942 // -- for all the nonstatic data members of X that are of a 4943 // class type M (or array thereof), each such class type 4944 // has a copy constructor whose first parameter is of type 4945 // const M& or const volatile M&. 4946 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4947 FieldEnd = ClassDecl->field_end(); 4948 HasConstCopyConstructor && Field != FieldEnd; 4949 ++Field) { 4950 QualType FieldType = (*Field)->getType(); 4951 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4952 FieldType = Array->getElementType(); 4953 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4954 const CXXRecordDecl *FieldClassDecl 4955 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4956 HasConstCopyConstructor 4957 = FieldClassDecl->hasConstCopyConstructor(Context); 4958 } 4959 } 4960 4961 // Otherwise, the implicitly declared copy constructor will have 4962 // the form 4963 // 4964 // X::X(X&) 4965 QualType ClassType = Context.getTypeDeclType(ClassDecl); 4966 QualType ArgType = ClassType; 4967 if (HasConstCopyConstructor) 4968 ArgType = ArgType.withConst(); 4969 ArgType = Context.getLValueReferenceType(ArgType); 4970 4971 // An implicitly-declared copy constructor is an inline public 4972 // member of its class. 4973 DeclarationName Name 4974 = Context.DeclarationNames.getCXXConstructorName( 4975 Context.getCanonicalType(ClassType)); 4976 CXXConstructorDecl *CopyConstructor 4977 = CXXConstructorDecl::Create(Context, ClassDecl, 4978 ClassDecl->getLocation(), Name, 4979 Context.getFunctionType(Context.VoidTy, 4980 &ArgType, 1, 4981 false, 0, 4982 /*FIXME: hasExceptionSpec*/false, 4983 false, 0, 0, 4984 FunctionType::ExtInfo()), 4985 /*TInfo=*/0, 4986 /*isExplicit=*/false, 4987 /*isInline=*/true, 4988 /*isImplicitlyDeclared=*/true); 4989 CopyConstructor->setAccess(AS_public); 4990 CopyConstructor->setImplicit(); 4991 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 4992 4993 // Add the parameter to the constructor. 4994 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 4995 ClassDecl->getLocation(), 4996 /*IdentifierInfo=*/0, 4997 ArgType, /*TInfo=*/0, 4998 VarDecl::None, 4999 VarDecl::None, 0); 5000 CopyConstructor->setParams(&FromParam, 1); 5001 if (S) 5002 PushOnScopeChains(CopyConstructor, S, true); 5003 else 5004 ClassDecl->addDecl(CopyConstructor); 5005 5006 return CopyConstructor; 5007} 5008 5009void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5010 CXXConstructorDecl *CopyConstructor, 5011 unsigned TypeQuals) { 5012 assert((CopyConstructor->isImplicit() && 5013 CopyConstructor->isCopyConstructor(TypeQuals) && 5014 !CopyConstructor->isUsed(false)) && 5015 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5016 5017 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5018 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5019 5020 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5021 ErrorTrap Trap(*this); 5022 5023 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5024 Trap.hasErrorOccurred()) { 5025 Diag(CurrentLocation, diag::note_member_synthesized_at) 5026 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5027 CopyConstructor->setInvalidDecl(); 5028 } else { 5029 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5030 CopyConstructor->getLocation(), 5031 MultiStmtArg(*this, 0, 0), 5032 /*isStmtExpr=*/false) 5033 .takeAs<Stmt>()); 5034 } 5035 5036 CopyConstructor->setUsed(); 5037} 5038 5039Sema::OwningExprResult 5040Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5041 CXXConstructorDecl *Constructor, 5042 MultiExprArg ExprArgs, 5043 bool RequiresZeroInit, 5044 CXXConstructExpr::ConstructionKind ConstructKind) { 5045 bool Elidable = false; 5046 5047 // C++0x [class.copy]p34: 5048 // When certain criteria are met, an implementation is allowed to 5049 // omit the copy/move construction of a class object, even if the 5050 // copy/move constructor and/or destructor for the object have 5051 // side effects. [...] 5052 // - when a temporary class object that has not been bound to a 5053 // reference (12.2) would be copied/moved to a class object 5054 // with the same cv-unqualified type, the copy/move operation 5055 // can be omitted by constructing the temporary object 5056 // directly into the target of the omitted copy/move 5057 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5058 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5059 Elidable = SubExpr->isTemporaryObject() && 5060 Context.hasSameUnqualifiedType(SubExpr->getType(), 5061 Context.getTypeDeclType(Constructor->getParent())); 5062 } 5063 5064 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5065 Elidable, move(ExprArgs), RequiresZeroInit, 5066 ConstructKind); 5067} 5068 5069/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5070/// including handling of its default argument expressions. 5071Sema::OwningExprResult 5072Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5073 CXXConstructorDecl *Constructor, bool Elidable, 5074 MultiExprArg ExprArgs, 5075 bool RequiresZeroInit, 5076 CXXConstructExpr::ConstructionKind ConstructKind) { 5077 unsigned NumExprs = ExprArgs.size(); 5078 Expr **Exprs = (Expr **)ExprArgs.release(); 5079 5080 MarkDeclarationReferenced(ConstructLoc, Constructor); 5081 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5082 Constructor, Elidable, Exprs, NumExprs, 5083 RequiresZeroInit, ConstructKind)); 5084} 5085 5086bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5087 CXXConstructorDecl *Constructor, 5088 MultiExprArg Exprs) { 5089 OwningExprResult TempResult = 5090 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5091 move(Exprs)); 5092 if (TempResult.isInvalid()) 5093 return true; 5094 5095 Expr *Temp = TempResult.takeAs<Expr>(); 5096 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5097 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5098 VD->setInit(Temp); 5099 5100 return false; 5101} 5102 5103void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5104 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5105 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5106 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5107 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(); 5108 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5109 CheckDestructorAccess(VD->getLocation(), Destructor, 5110 PDiag(diag::err_access_dtor_var) 5111 << VD->getDeclName() 5112 << VD->getType()); 5113 } 5114} 5115 5116/// AddCXXDirectInitializerToDecl - This action is called immediately after 5117/// ActOnDeclarator, when a C++ direct initializer is present. 5118/// e.g: "int x(1);" 5119void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5120 SourceLocation LParenLoc, 5121 MultiExprArg Exprs, 5122 SourceLocation *CommaLocs, 5123 SourceLocation RParenLoc) { 5124 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5125 Decl *RealDecl = Dcl.getAs<Decl>(); 5126 5127 // If there is no declaration, there was an error parsing it. Just ignore 5128 // the initializer. 5129 if (RealDecl == 0) 5130 return; 5131 5132 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5133 if (!VDecl) { 5134 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5135 RealDecl->setInvalidDecl(); 5136 return; 5137 } 5138 5139 // We will represent direct-initialization similarly to copy-initialization: 5140 // int x(1); -as-> int x = 1; 5141 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5142 // 5143 // Clients that want to distinguish between the two forms, can check for 5144 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5145 // A major benefit is that clients that don't particularly care about which 5146 // exactly form was it (like the CodeGen) can handle both cases without 5147 // special case code. 5148 5149 // C++ 8.5p11: 5150 // The form of initialization (using parentheses or '=') is generally 5151 // insignificant, but does matter when the entity being initialized has a 5152 // class type. 5153 QualType DeclInitType = VDecl->getType(); 5154 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 5155 DeclInitType = Context.getBaseElementType(Array); 5156 5157 if (!VDecl->getType()->isDependentType() && 5158 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5159 diag::err_typecheck_decl_incomplete_type)) { 5160 VDecl->setInvalidDecl(); 5161 return; 5162 } 5163 5164 // The variable can not have an abstract class type. 5165 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5166 diag::err_abstract_type_in_decl, 5167 AbstractVariableType)) 5168 VDecl->setInvalidDecl(); 5169 5170 const VarDecl *Def; 5171 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5172 Diag(VDecl->getLocation(), diag::err_redefinition) 5173 << VDecl->getDeclName(); 5174 Diag(Def->getLocation(), diag::note_previous_definition); 5175 VDecl->setInvalidDecl(); 5176 return; 5177 } 5178 5179 // If either the declaration has a dependent type or if any of the 5180 // expressions is type-dependent, we represent the initialization 5181 // via a ParenListExpr for later use during template instantiation. 5182 if (VDecl->getType()->isDependentType() || 5183 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5184 // Let clients know that initialization was done with a direct initializer. 5185 VDecl->setCXXDirectInitializer(true); 5186 5187 // Store the initialization expressions as a ParenListExpr. 5188 unsigned NumExprs = Exprs.size(); 5189 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5190 (Expr **)Exprs.release(), 5191 NumExprs, RParenLoc)); 5192 return; 5193 } 5194 5195 // Capture the variable that is being initialized and the style of 5196 // initialization. 5197 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5198 5199 // FIXME: Poor source location information. 5200 InitializationKind Kind 5201 = InitializationKind::CreateDirect(VDecl->getLocation(), 5202 LParenLoc, RParenLoc); 5203 5204 InitializationSequence InitSeq(*this, Entity, Kind, 5205 (Expr**)Exprs.get(), Exprs.size()); 5206 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5207 if (Result.isInvalid()) { 5208 VDecl->setInvalidDecl(); 5209 return; 5210 } 5211 5212 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5213 VDecl->setInit(Result.takeAs<Expr>()); 5214 VDecl->setCXXDirectInitializer(true); 5215 5216 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5217 FinalizeVarWithDestructor(VDecl, Record); 5218} 5219 5220/// \brief Given a constructor and the set of arguments provided for the 5221/// constructor, convert the arguments and add any required default arguments 5222/// to form a proper call to this constructor. 5223/// 5224/// \returns true if an error occurred, false otherwise. 5225bool 5226Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5227 MultiExprArg ArgsPtr, 5228 SourceLocation Loc, 5229 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5230 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5231 unsigned NumArgs = ArgsPtr.size(); 5232 Expr **Args = (Expr **)ArgsPtr.get(); 5233 5234 const FunctionProtoType *Proto 5235 = Constructor->getType()->getAs<FunctionProtoType>(); 5236 assert(Proto && "Constructor without a prototype?"); 5237 unsigned NumArgsInProto = Proto->getNumArgs(); 5238 5239 // If too few arguments are available, we'll fill in the rest with defaults. 5240 if (NumArgs < NumArgsInProto) 5241 ConvertedArgs.reserve(NumArgsInProto); 5242 else 5243 ConvertedArgs.reserve(NumArgs); 5244 5245 VariadicCallType CallType = 5246 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5247 llvm::SmallVector<Expr *, 8> AllArgs; 5248 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5249 Proto, 0, Args, NumArgs, AllArgs, 5250 CallType); 5251 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5252 ConvertedArgs.push_back(AllArgs[i]); 5253 return Invalid; 5254} 5255 5256static inline bool 5257CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5258 const FunctionDecl *FnDecl) { 5259 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5260 if (isa<NamespaceDecl>(DC)) { 5261 return SemaRef.Diag(FnDecl->getLocation(), 5262 diag::err_operator_new_delete_declared_in_namespace) 5263 << FnDecl->getDeclName(); 5264 } 5265 5266 if (isa<TranslationUnitDecl>(DC) && 5267 FnDecl->getStorageClass() == FunctionDecl::Static) { 5268 return SemaRef.Diag(FnDecl->getLocation(), 5269 diag::err_operator_new_delete_declared_static) 5270 << FnDecl->getDeclName(); 5271 } 5272 5273 return false; 5274} 5275 5276static inline bool 5277CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5278 CanQualType ExpectedResultType, 5279 CanQualType ExpectedFirstParamType, 5280 unsigned DependentParamTypeDiag, 5281 unsigned InvalidParamTypeDiag) { 5282 QualType ResultType = 5283 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5284 5285 // Check that the result type is not dependent. 5286 if (ResultType->isDependentType()) 5287 return SemaRef.Diag(FnDecl->getLocation(), 5288 diag::err_operator_new_delete_dependent_result_type) 5289 << FnDecl->getDeclName() << ExpectedResultType; 5290 5291 // Check that the result type is what we expect. 5292 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5293 return SemaRef.Diag(FnDecl->getLocation(), 5294 diag::err_operator_new_delete_invalid_result_type) 5295 << FnDecl->getDeclName() << ExpectedResultType; 5296 5297 // A function template must have at least 2 parameters. 5298 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5299 return SemaRef.Diag(FnDecl->getLocation(), 5300 diag::err_operator_new_delete_template_too_few_parameters) 5301 << FnDecl->getDeclName(); 5302 5303 // The function decl must have at least 1 parameter. 5304 if (FnDecl->getNumParams() == 0) 5305 return SemaRef.Diag(FnDecl->getLocation(), 5306 diag::err_operator_new_delete_too_few_parameters) 5307 << FnDecl->getDeclName(); 5308 5309 // Check the the first parameter type is not dependent. 5310 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5311 if (FirstParamType->isDependentType()) 5312 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5313 << FnDecl->getDeclName() << ExpectedFirstParamType; 5314 5315 // Check that the first parameter type is what we expect. 5316 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5317 ExpectedFirstParamType) 5318 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5319 << FnDecl->getDeclName() << ExpectedFirstParamType; 5320 5321 return false; 5322} 5323 5324static bool 5325CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5326 // C++ [basic.stc.dynamic.allocation]p1: 5327 // A program is ill-formed if an allocation function is declared in a 5328 // namespace scope other than global scope or declared static in global 5329 // scope. 5330 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5331 return true; 5332 5333 CanQualType SizeTy = 5334 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5335 5336 // C++ [basic.stc.dynamic.allocation]p1: 5337 // The return type shall be void*. The first parameter shall have type 5338 // std::size_t. 5339 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5340 SizeTy, 5341 diag::err_operator_new_dependent_param_type, 5342 diag::err_operator_new_param_type)) 5343 return true; 5344 5345 // C++ [basic.stc.dynamic.allocation]p1: 5346 // The first parameter shall not have an associated default argument. 5347 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5348 return SemaRef.Diag(FnDecl->getLocation(), 5349 diag::err_operator_new_default_arg) 5350 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5351 5352 return false; 5353} 5354 5355static bool 5356CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5357 // C++ [basic.stc.dynamic.deallocation]p1: 5358 // A program is ill-formed if deallocation functions are declared in a 5359 // namespace scope other than global scope or declared static in global 5360 // scope. 5361 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5362 return true; 5363 5364 // C++ [basic.stc.dynamic.deallocation]p2: 5365 // Each deallocation function shall return void and its first parameter 5366 // shall be void*. 5367 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5368 SemaRef.Context.VoidPtrTy, 5369 diag::err_operator_delete_dependent_param_type, 5370 diag::err_operator_delete_param_type)) 5371 return true; 5372 5373 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5374 if (FirstParamType->isDependentType()) 5375 return SemaRef.Diag(FnDecl->getLocation(), 5376 diag::err_operator_delete_dependent_param_type) 5377 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5378 5379 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5380 SemaRef.Context.VoidPtrTy) 5381 return SemaRef.Diag(FnDecl->getLocation(), 5382 diag::err_operator_delete_param_type) 5383 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5384 5385 return false; 5386} 5387 5388/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5389/// of this overloaded operator is well-formed. If so, returns false; 5390/// otherwise, emits appropriate diagnostics and returns true. 5391bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5392 assert(FnDecl && FnDecl->isOverloadedOperator() && 5393 "Expected an overloaded operator declaration"); 5394 5395 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5396 5397 // C++ [over.oper]p5: 5398 // The allocation and deallocation functions, operator new, 5399 // operator new[], operator delete and operator delete[], are 5400 // described completely in 3.7.3. The attributes and restrictions 5401 // found in the rest of this subclause do not apply to them unless 5402 // explicitly stated in 3.7.3. 5403 if (Op == OO_Delete || Op == OO_Array_Delete) 5404 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5405 5406 if (Op == OO_New || Op == OO_Array_New) 5407 return CheckOperatorNewDeclaration(*this, FnDecl); 5408 5409 // C++ [over.oper]p6: 5410 // An operator function shall either be a non-static member 5411 // function or be a non-member function and have at least one 5412 // parameter whose type is a class, a reference to a class, an 5413 // enumeration, or a reference to an enumeration. 5414 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5415 if (MethodDecl->isStatic()) 5416 return Diag(FnDecl->getLocation(), 5417 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5418 } else { 5419 bool ClassOrEnumParam = false; 5420 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5421 ParamEnd = FnDecl->param_end(); 5422 Param != ParamEnd; ++Param) { 5423 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5424 if (ParamType->isDependentType() || ParamType->isRecordType() || 5425 ParamType->isEnumeralType()) { 5426 ClassOrEnumParam = true; 5427 break; 5428 } 5429 } 5430 5431 if (!ClassOrEnumParam) 5432 return Diag(FnDecl->getLocation(), 5433 diag::err_operator_overload_needs_class_or_enum) 5434 << FnDecl->getDeclName(); 5435 } 5436 5437 // C++ [over.oper]p8: 5438 // An operator function cannot have default arguments (8.3.6), 5439 // except where explicitly stated below. 5440 // 5441 // Only the function-call operator allows default arguments 5442 // (C++ [over.call]p1). 5443 if (Op != OO_Call) { 5444 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5445 Param != FnDecl->param_end(); ++Param) { 5446 if ((*Param)->hasDefaultArg()) 5447 return Diag((*Param)->getLocation(), 5448 diag::err_operator_overload_default_arg) 5449 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5450 } 5451 } 5452 5453 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5454 { false, false, false } 5455#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5456 , { Unary, Binary, MemberOnly } 5457#include "clang/Basic/OperatorKinds.def" 5458 }; 5459 5460 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5461 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5462 bool MustBeMemberOperator = OperatorUses[Op][2]; 5463 5464 // C++ [over.oper]p8: 5465 // [...] Operator functions cannot have more or fewer parameters 5466 // than the number required for the corresponding operator, as 5467 // described in the rest of this subclause. 5468 unsigned NumParams = FnDecl->getNumParams() 5469 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5470 if (Op != OO_Call && 5471 ((NumParams == 1 && !CanBeUnaryOperator) || 5472 (NumParams == 2 && !CanBeBinaryOperator) || 5473 (NumParams < 1) || (NumParams > 2))) { 5474 // We have the wrong number of parameters. 5475 unsigned ErrorKind; 5476 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5477 ErrorKind = 2; // 2 -> unary or binary. 5478 } else if (CanBeUnaryOperator) { 5479 ErrorKind = 0; // 0 -> unary 5480 } else { 5481 assert(CanBeBinaryOperator && 5482 "All non-call overloaded operators are unary or binary!"); 5483 ErrorKind = 1; // 1 -> binary 5484 } 5485 5486 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5487 << FnDecl->getDeclName() << NumParams << ErrorKind; 5488 } 5489 5490 // Overloaded operators other than operator() cannot be variadic. 5491 if (Op != OO_Call && 5492 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5493 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5494 << FnDecl->getDeclName(); 5495 } 5496 5497 // Some operators must be non-static member functions. 5498 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5499 return Diag(FnDecl->getLocation(), 5500 diag::err_operator_overload_must_be_member) 5501 << FnDecl->getDeclName(); 5502 } 5503 5504 // C++ [over.inc]p1: 5505 // The user-defined function called operator++ implements the 5506 // prefix and postfix ++ operator. If this function is a member 5507 // function with no parameters, or a non-member function with one 5508 // parameter of class or enumeration type, it defines the prefix 5509 // increment operator ++ for objects of that type. If the function 5510 // is a member function with one parameter (which shall be of type 5511 // int) or a non-member function with two parameters (the second 5512 // of which shall be of type int), it defines the postfix 5513 // increment operator ++ for objects of that type. 5514 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5515 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5516 bool ParamIsInt = false; 5517 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5518 ParamIsInt = BT->getKind() == BuiltinType::Int; 5519 5520 if (!ParamIsInt) 5521 return Diag(LastParam->getLocation(), 5522 diag::err_operator_overload_post_incdec_must_be_int) 5523 << LastParam->getType() << (Op == OO_MinusMinus); 5524 } 5525 5526 // Notify the class if it got an assignment operator. 5527 if (Op == OO_Equal) { 5528 // Would have returned earlier otherwise. 5529 assert(isa<CXXMethodDecl>(FnDecl) && 5530 "Overloaded = not member, but not filtered."); 5531 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5532 Method->getParent()->addedAssignmentOperator(Context, Method); 5533 } 5534 5535 return false; 5536} 5537 5538/// CheckLiteralOperatorDeclaration - Check whether the declaration 5539/// of this literal operator function is well-formed. If so, returns 5540/// false; otherwise, emits appropriate diagnostics and returns true. 5541bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5542 DeclContext *DC = FnDecl->getDeclContext(); 5543 Decl::Kind Kind = DC->getDeclKind(); 5544 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5545 Kind != Decl::LinkageSpec) { 5546 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5547 << FnDecl->getDeclName(); 5548 return true; 5549 } 5550 5551 bool Valid = false; 5552 5553 // template <char...> type operator "" name() is the only valid template 5554 // signature, and the only valid signature with no parameters. 5555 if (FnDecl->param_size() == 0) { 5556 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5557 // Must have only one template parameter 5558 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5559 if (Params->size() == 1) { 5560 NonTypeTemplateParmDecl *PmDecl = 5561 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5562 5563 // The template parameter must be a char parameter pack. 5564 // FIXME: This test will always fail because non-type parameter packs 5565 // have not been implemented. 5566 if (PmDecl && PmDecl->isTemplateParameterPack() && 5567 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5568 Valid = true; 5569 } 5570 } 5571 } else { 5572 // Check the first parameter 5573 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5574 5575 QualType T = (*Param)->getType(); 5576 5577 // unsigned long long int, long double, and any character type are allowed 5578 // as the only parameters. 5579 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5580 Context.hasSameType(T, Context.LongDoubleTy) || 5581 Context.hasSameType(T, Context.CharTy) || 5582 Context.hasSameType(T, Context.WCharTy) || 5583 Context.hasSameType(T, Context.Char16Ty) || 5584 Context.hasSameType(T, Context.Char32Ty)) { 5585 if (++Param == FnDecl->param_end()) 5586 Valid = true; 5587 goto FinishedParams; 5588 } 5589 5590 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5591 const PointerType *PT = T->getAs<PointerType>(); 5592 if (!PT) 5593 goto FinishedParams; 5594 T = PT->getPointeeType(); 5595 if (!T.isConstQualified()) 5596 goto FinishedParams; 5597 T = T.getUnqualifiedType(); 5598 5599 // Move on to the second parameter; 5600 ++Param; 5601 5602 // If there is no second parameter, the first must be a const char * 5603 if (Param == FnDecl->param_end()) { 5604 if (Context.hasSameType(T, Context.CharTy)) 5605 Valid = true; 5606 goto FinishedParams; 5607 } 5608 5609 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5610 // are allowed as the first parameter to a two-parameter function 5611 if (!(Context.hasSameType(T, Context.CharTy) || 5612 Context.hasSameType(T, Context.WCharTy) || 5613 Context.hasSameType(T, Context.Char16Ty) || 5614 Context.hasSameType(T, Context.Char32Ty))) 5615 goto FinishedParams; 5616 5617 // The second and final parameter must be an std::size_t 5618 T = (*Param)->getType().getUnqualifiedType(); 5619 if (Context.hasSameType(T, Context.getSizeType()) && 5620 ++Param == FnDecl->param_end()) 5621 Valid = true; 5622 } 5623 5624 // FIXME: This diagnostic is absolutely terrible. 5625FinishedParams: 5626 if (!Valid) { 5627 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5628 << FnDecl->getDeclName(); 5629 return true; 5630 } 5631 5632 return false; 5633} 5634 5635/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5636/// linkage specification, including the language and (if present) 5637/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5638/// the location of the language string literal, which is provided 5639/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5640/// the '{' brace. Otherwise, this linkage specification does not 5641/// have any braces. 5642Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5643 SourceLocation ExternLoc, 5644 SourceLocation LangLoc, 5645 llvm::StringRef Lang, 5646 SourceLocation LBraceLoc) { 5647 LinkageSpecDecl::LanguageIDs Language; 5648 if (Lang == "\"C\"") 5649 Language = LinkageSpecDecl::lang_c; 5650 else if (Lang == "\"C++\"") 5651 Language = LinkageSpecDecl::lang_cxx; 5652 else { 5653 Diag(LangLoc, diag::err_bad_language); 5654 return DeclPtrTy(); 5655 } 5656 5657 // FIXME: Add all the various semantics of linkage specifications 5658 5659 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5660 LangLoc, Language, 5661 LBraceLoc.isValid()); 5662 CurContext->addDecl(D); 5663 PushDeclContext(S, D); 5664 return DeclPtrTy::make(D); 5665} 5666 5667/// ActOnFinishLinkageSpecification - Completely the definition of 5668/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5669/// valid, it's the position of the closing '}' brace in a linkage 5670/// specification that uses braces. 5671Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5672 DeclPtrTy LinkageSpec, 5673 SourceLocation RBraceLoc) { 5674 if (LinkageSpec) 5675 PopDeclContext(); 5676 return LinkageSpec; 5677} 5678 5679/// \brief Perform semantic analysis for the variable declaration that 5680/// occurs within a C++ catch clause, returning the newly-created 5681/// variable. 5682VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5683 TypeSourceInfo *TInfo, 5684 IdentifierInfo *Name, 5685 SourceLocation Loc, 5686 SourceRange Range) { 5687 bool Invalid = false; 5688 5689 // Arrays and functions decay. 5690 if (ExDeclType->isArrayType()) 5691 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5692 else if (ExDeclType->isFunctionType()) 5693 ExDeclType = Context.getPointerType(ExDeclType); 5694 5695 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5696 // The exception-declaration shall not denote a pointer or reference to an 5697 // incomplete type, other than [cv] void*. 5698 // N2844 forbids rvalue references. 5699 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5700 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5701 Invalid = true; 5702 } 5703 5704 // GCC allows catching pointers and references to incomplete types 5705 // as an extension; so do we, but we warn by default. 5706 5707 QualType BaseType = ExDeclType; 5708 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5709 unsigned DK = diag::err_catch_incomplete; 5710 bool IncompleteCatchIsInvalid = true; 5711 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5712 BaseType = Ptr->getPointeeType(); 5713 Mode = 1; 5714 DK = diag::ext_catch_incomplete_ptr; 5715 IncompleteCatchIsInvalid = false; 5716 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5717 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5718 BaseType = Ref->getPointeeType(); 5719 Mode = 2; 5720 DK = diag::ext_catch_incomplete_ref; 5721 IncompleteCatchIsInvalid = false; 5722 } 5723 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5724 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5725 IncompleteCatchIsInvalid) 5726 Invalid = true; 5727 5728 if (!Invalid && !ExDeclType->isDependentType() && 5729 RequireNonAbstractType(Loc, ExDeclType, 5730 diag::err_abstract_type_in_decl, 5731 AbstractVariableType)) 5732 Invalid = true; 5733 5734 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5735 Name, ExDeclType, TInfo, VarDecl::None, 5736 VarDecl::None); 5737 ExDecl->setExceptionVariable(true); 5738 5739 if (!Invalid) { 5740 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5741 // C++ [except.handle]p16: 5742 // The object declared in an exception-declaration or, if the 5743 // exception-declaration does not specify a name, a temporary (12.2) is 5744 // copy-initialized (8.5) from the exception object. [...] 5745 // The object is destroyed when the handler exits, after the destruction 5746 // of any automatic objects initialized within the handler. 5747 // 5748 // We just pretend to initialize the object with itself, then make sure 5749 // it can be destroyed later. 5750 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5751 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5752 Loc, ExDeclType, 0); 5753 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5754 SourceLocation()); 5755 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5756 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5757 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5758 if (Result.isInvalid()) 5759 Invalid = true; 5760 else 5761 FinalizeVarWithDestructor(ExDecl, RecordTy); 5762 } 5763 } 5764 5765 if (Invalid) 5766 ExDecl->setInvalidDecl(); 5767 5768 return ExDecl; 5769} 5770 5771/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5772/// handler. 5773Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5774 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5775 QualType ExDeclType = TInfo->getType(); 5776 5777 bool Invalid = D.isInvalidType(); 5778 IdentifierInfo *II = D.getIdentifier(); 5779 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5780 LookupOrdinaryName, 5781 ForRedeclaration)) { 5782 // The scope should be freshly made just for us. There is just no way 5783 // it contains any previous declaration. 5784 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5785 if (PrevDecl->isTemplateParameter()) { 5786 // Maybe we will complain about the shadowed template parameter. 5787 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5788 } 5789 } 5790 5791 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5792 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5793 << D.getCXXScopeSpec().getRange(); 5794 Invalid = true; 5795 } 5796 5797 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5798 D.getIdentifier(), 5799 D.getIdentifierLoc(), 5800 D.getDeclSpec().getSourceRange()); 5801 5802 if (Invalid) 5803 ExDecl->setInvalidDecl(); 5804 5805 // Add the exception declaration into this scope. 5806 if (II) 5807 PushOnScopeChains(ExDecl, S); 5808 else 5809 CurContext->addDecl(ExDecl); 5810 5811 ProcessDeclAttributes(S, ExDecl, D); 5812 return DeclPtrTy::make(ExDecl); 5813} 5814 5815Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5816 ExprArg assertexpr, 5817 ExprArg assertmessageexpr) { 5818 Expr *AssertExpr = (Expr *)assertexpr.get(); 5819 StringLiteral *AssertMessage = 5820 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5821 5822 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5823 llvm::APSInt Value(32); 5824 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5825 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5826 AssertExpr->getSourceRange(); 5827 return DeclPtrTy(); 5828 } 5829 5830 if (Value == 0) { 5831 Diag(AssertLoc, diag::err_static_assert_failed) 5832 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5833 } 5834 } 5835 5836 assertexpr.release(); 5837 assertmessageexpr.release(); 5838 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5839 AssertExpr, AssertMessage); 5840 5841 CurContext->addDecl(Decl); 5842 return DeclPtrTy::make(Decl); 5843} 5844 5845/// \brief Perform semantic analysis of the given friend type declaration. 5846/// 5847/// \returns A friend declaration that. 5848FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5849 TypeSourceInfo *TSInfo) { 5850 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5851 5852 QualType T = TSInfo->getType(); 5853 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5854 5855 if (!getLangOptions().CPlusPlus0x) { 5856 // C++03 [class.friend]p2: 5857 // An elaborated-type-specifier shall be used in a friend declaration 5858 // for a class.* 5859 // 5860 // * The class-key of the elaborated-type-specifier is required. 5861 if (!ActiveTemplateInstantiations.empty()) { 5862 // Do not complain about the form of friend template types during 5863 // template instantiation; we will already have complained when the 5864 // template was declared. 5865 } else if (!T->isElaboratedTypeSpecifier()) { 5866 // If we evaluated the type to a record type, suggest putting 5867 // a tag in front. 5868 if (const RecordType *RT = T->getAs<RecordType>()) { 5869 RecordDecl *RD = RT->getDecl(); 5870 5871 std::string InsertionText = std::string(" ") + RD->getKindName(); 5872 5873 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5874 << (unsigned) RD->getTagKind() 5875 << T 5876 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5877 InsertionText); 5878 } else { 5879 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5880 << T 5881 << SourceRange(FriendLoc, TypeRange.getEnd()); 5882 } 5883 } else if (T->getAs<EnumType>()) { 5884 Diag(FriendLoc, diag::ext_enum_friend) 5885 << T 5886 << SourceRange(FriendLoc, TypeRange.getEnd()); 5887 } 5888 } 5889 5890 // C++0x [class.friend]p3: 5891 // If the type specifier in a friend declaration designates a (possibly 5892 // cv-qualified) class type, that class is declared as a friend; otherwise, 5893 // the friend declaration is ignored. 5894 5895 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5896 // in [class.friend]p3 that we do not implement. 5897 5898 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5899} 5900 5901/// Handle a friend type declaration. This works in tandem with 5902/// ActOnTag. 5903/// 5904/// Notes on friend class templates: 5905/// 5906/// We generally treat friend class declarations as if they were 5907/// declaring a class. So, for example, the elaborated type specifier 5908/// in a friend declaration is required to obey the restrictions of a 5909/// class-head (i.e. no typedefs in the scope chain), template 5910/// parameters are required to match up with simple template-ids, &c. 5911/// However, unlike when declaring a template specialization, it's 5912/// okay to refer to a template specialization without an empty 5913/// template parameter declaration, e.g. 5914/// friend class A<T>::B<unsigned>; 5915/// We permit this as a special case; if there are any template 5916/// parameters present at all, require proper matching, i.e. 5917/// template <> template <class T> friend class A<int>::B; 5918Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5919 MultiTemplateParamsArg TempParams) { 5920 SourceLocation Loc = DS.getSourceRange().getBegin(); 5921 5922 assert(DS.isFriendSpecified()); 5923 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5924 5925 // Try to convert the decl specifier to a type. This works for 5926 // friend templates because ActOnTag never produces a ClassTemplateDecl 5927 // for a TUK_Friend. 5928 Declarator TheDeclarator(DS, Declarator::MemberContext); 5929 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 5930 QualType T = TSI->getType(); 5931 if (TheDeclarator.isInvalidType()) 5932 return DeclPtrTy(); 5933 5934 // This is definitely an error in C++98. It's probably meant to 5935 // be forbidden in C++0x, too, but the specification is just 5936 // poorly written. 5937 // 5938 // The problem is with declarations like the following: 5939 // template <T> friend A<T>::foo; 5940 // where deciding whether a class C is a friend or not now hinges 5941 // on whether there exists an instantiation of A that causes 5942 // 'foo' to equal C. There are restrictions on class-heads 5943 // (which we declare (by fiat) elaborated friend declarations to 5944 // be) that makes this tractable. 5945 // 5946 // FIXME: handle "template <> friend class A<T>;", which 5947 // is possibly well-formed? Who even knows? 5948 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5949 Diag(Loc, diag::err_tagless_friend_type_template) 5950 << DS.getSourceRange(); 5951 return DeclPtrTy(); 5952 } 5953 5954 // C++98 [class.friend]p1: A friend of a class is a function 5955 // or class that is not a member of the class . . . 5956 // This is fixed in DR77, which just barely didn't make the C++03 5957 // deadline. It's also a very silly restriction that seriously 5958 // affects inner classes and which nobody else seems to implement; 5959 // thus we never diagnose it, not even in -pedantic. 5960 // 5961 // But note that we could warn about it: it's always useless to 5962 // friend one of your own members (it's not, however, worthless to 5963 // friend a member of an arbitrary specialization of your template). 5964 5965 Decl *D; 5966 if (unsigned NumTempParamLists = TempParams.size()) 5967 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5968 NumTempParamLists, 5969 (TemplateParameterList**) TempParams.release(), 5970 TSI, 5971 DS.getFriendSpecLoc()); 5972 else 5973 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5974 5975 if (!D) 5976 return DeclPtrTy(); 5977 5978 D->setAccess(AS_public); 5979 CurContext->addDecl(D); 5980 5981 return DeclPtrTy::make(D); 5982} 5983 5984Sema::DeclPtrTy 5985Sema::ActOnFriendFunctionDecl(Scope *S, 5986 Declarator &D, 5987 bool IsDefinition, 5988 MultiTemplateParamsArg TemplateParams) { 5989 const DeclSpec &DS = D.getDeclSpec(); 5990 5991 assert(DS.isFriendSpecified()); 5992 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5993 5994 SourceLocation Loc = D.getIdentifierLoc(); 5995 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5996 QualType T = TInfo->getType(); 5997 5998 // C++ [class.friend]p1 5999 // A friend of a class is a function or class.... 6000 // Note that this sees through typedefs, which is intended. 6001 // It *doesn't* see through dependent types, which is correct 6002 // according to [temp.arg.type]p3: 6003 // If a declaration acquires a function type through a 6004 // type dependent on a template-parameter and this causes 6005 // a declaration that does not use the syntactic form of a 6006 // function declarator to have a function type, the program 6007 // is ill-formed. 6008 if (!T->isFunctionType()) { 6009 Diag(Loc, diag::err_unexpected_friend); 6010 6011 // It might be worthwhile to try to recover by creating an 6012 // appropriate declaration. 6013 return DeclPtrTy(); 6014 } 6015 6016 // C++ [namespace.memdef]p3 6017 // - If a friend declaration in a non-local class first declares a 6018 // class or function, the friend class or function is a member 6019 // of the innermost enclosing namespace. 6020 // - The name of the friend is not found by simple name lookup 6021 // until a matching declaration is provided in that namespace 6022 // scope (either before or after the class declaration granting 6023 // friendship). 6024 // - If a friend function is called, its name may be found by the 6025 // name lookup that considers functions from namespaces and 6026 // classes associated with the types of the function arguments. 6027 // - When looking for a prior declaration of a class or a function 6028 // declared as a friend, scopes outside the innermost enclosing 6029 // namespace scope are not considered. 6030 6031 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6032 DeclarationName Name = GetNameForDeclarator(D); 6033 assert(Name); 6034 6035 // The context we found the declaration in, or in which we should 6036 // create the declaration. 6037 DeclContext *DC; 6038 6039 // FIXME: handle local classes 6040 6041 // Recover from invalid scope qualifiers as if they just weren't there. 6042 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 6043 ForRedeclaration); 6044 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6045 DC = computeDeclContext(ScopeQual); 6046 6047 // FIXME: handle dependent contexts 6048 if (!DC) return DeclPtrTy(); 6049 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6050 6051 LookupQualifiedName(Previous, DC); 6052 6053 // Ignore things found implicitly in the wrong scope. 6054 // TODO: better diagnostics for this case. Suggesting the right 6055 // qualified scope would be nice... 6056 LookupResult::Filter F = Previous.makeFilter(); 6057 while (F.hasNext()) { 6058 NamedDecl *D = F.next(); 6059 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6060 F.erase(); 6061 } 6062 F.done(); 6063 6064 if (Previous.empty()) { 6065 D.setInvalidType(); 6066 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6067 return DeclPtrTy(); 6068 } 6069 6070 // C++ [class.friend]p1: A friend of a class is a function or 6071 // class that is not a member of the class . . . 6072 if (DC->Equals(CurContext)) 6073 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6074 6075 // Otherwise walk out to the nearest namespace scope looking for matches. 6076 } else { 6077 // TODO: handle local class contexts. 6078 6079 DC = CurContext; 6080 while (true) { 6081 // Skip class contexts. If someone can cite chapter and verse 6082 // for this behavior, that would be nice --- it's what GCC and 6083 // EDG do, and it seems like a reasonable intent, but the spec 6084 // really only says that checks for unqualified existing 6085 // declarations should stop at the nearest enclosing namespace, 6086 // not that they should only consider the nearest enclosing 6087 // namespace. 6088 while (DC->isRecord()) 6089 DC = DC->getParent(); 6090 6091 LookupQualifiedName(Previous, DC); 6092 6093 // TODO: decide what we think about using declarations. 6094 if (!Previous.empty()) 6095 break; 6096 6097 if (DC->isFileContext()) break; 6098 DC = DC->getParent(); 6099 } 6100 6101 // C++ [class.friend]p1: A friend of a class is a function or 6102 // class that is not a member of the class . . . 6103 // C++0x changes this for both friend types and functions. 6104 // Most C++ 98 compilers do seem to give an error here, so 6105 // we do, too. 6106 if (!Previous.empty() && DC->Equals(CurContext) 6107 && !getLangOptions().CPlusPlus0x) 6108 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6109 } 6110 6111 if (DC->isFileContext()) { 6112 // This implies that it has to be an operator or function. 6113 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6114 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6115 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6116 Diag(Loc, diag::err_introducing_special_friend) << 6117 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6118 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6119 return DeclPtrTy(); 6120 } 6121 } 6122 6123 bool Redeclaration = false; 6124 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6125 move(TemplateParams), 6126 IsDefinition, 6127 Redeclaration); 6128 if (!ND) return DeclPtrTy(); 6129 6130 assert(ND->getDeclContext() == DC); 6131 assert(ND->getLexicalDeclContext() == CurContext); 6132 6133 // Add the function declaration to the appropriate lookup tables, 6134 // adjusting the redeclarations list as necessary. We don't 6135 // want to do this yet if the friending class is dependent. 6136 // 6137 // Also update the scope-based lookup if the target context's 6138 // lookup context is in lexical scope. 6139 if (!CurContext->isDependentContext()) { 6140 DC = DC->getLookupContext(); 6141 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6142 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6143 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6144 } 6145 6146 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6147 D.getIdentifierLoc(), ND, 6148 DS.getFriendSpecLoc()); 6149 FrD->setAccess(AS_public); 6150 CurContext->addDecl(FrD); 6151 6152 return DeclPtrTy::make(ND); 6153} 6154 6155void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6156 AdjustDeclIfTemplate(dcl); 6157 6158 Decl *Dcl = dcl.getAs<Decl>(); 6159 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6160 if (!Fn) { 6161 Diag(DelLoc, diag::err_deleted_non_function); 6162 return; 6163 } 6164 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6165 Diag(DelLoc, diag::err_deleted_decl_not_first); 6166 Diag(Prev->getLocation(), diag::note_previous_declaration); 6167 // If the declaration wasn't the first, we delete the function anyway for 6168 // recovery. 6169 } 6170 Fn->setDeleted(); 6171} 6172 6173static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6174 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6175 ++CI) { 6176 Stmt *SubStmt = *CI; 6177 if (!SubStmt) 6178 continue; 6179 if (isa<ReturnStmt>(SubStmt)) 6180 Self.Diag(SubStmt->getSourceRange().getBegin(), 6181 diag::err_return_in_constructor_handler); 6182 if (!isa<Expr>(SubStmt)) 6183 SearchForReturnInStmt(Self, SubStmt); 6184 } 6185} 6186 6187void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6188 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6189 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6190 SearchForReturnInStmt(*this, Handler); 6191 } 6192} 6193 6194bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6195 const CXXMethodDecl *Old) { 6196 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6197 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6198 6199 if (Context.hasSameType(NewTy, OldTy) || 6200 NewTy->isDependentType() || OldTy->isDependentType()) 6201 return false; 6202 6203 // Check if the return types are covariant 6204 QualType NewClassTy, OldClassTy; 6205 6206 /// Both types must be pointers or references to classes. 6207 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6208 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6209 NewClassTy = NewPT->getPointeeType(); 6210 OldClassTy = OldPT->getPointeeType(); 6211 } 6212 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6213 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6214 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6215 NewClassTy = NewRT->getPointeeType(); 6216 OldClassTy = OldRT->getPointeeType(); 6217 } 6218 } 6219 } 6220 6221 // The return types aren't either both pointers or references to a class type. 6222 if (NewClassTy.isNull()) { 6223 Diag(New->getLocation(), 6224 diag::err_different_return_type_for_overriding_virtual_function) 6225 << New->getDeclName() << NewTy << OldTy; 6226 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6227 6228 return true; 6229 } 6230 6231 // C++ [class.virtual]p6: 6232 // If the return type of D::f differs from the return type of B::f, the 6233 // class type in the return type of D::f shall be complete at the point of 6234 // declaration of D::f or shall be the class type D. 6235 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6236 if (!RT->isBeingDefined() && 6237 RequireCompleteType(New->getLocation(), NewClassTy, 6238 PDiag(diag::err_covariant_return_incomplete) 6239 << New->getDeclName())) 6240 return true; 6241 } 6242 6243 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6244 // Check if the new class derives from the old class. 6245 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6246 Diag(New->getLocation(), 6247 diag::err_covariant_return_not_derived) 6248 << New->getDeclName() << NewTy << OldTy; 6249 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6250 return true; 6251 } 6252 6253 // Check if we the conversion from derived to base is valid. 6254 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6255 diag::err_covariant_return_inaccessible_base, 6256 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6257 // FIXME: Should this point to the return type? 6258 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6259 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6260 return true; 6261 } 6262 } 6263 6264 // The qualifiers of the return types must be the same. 6265 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6266 Diag(New->getLocation(), 6267 diag::err_covariant_return_type_different_qualifications) 6268 << New->getDeclName() << NewTy << OldTy; 6269 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6270 return true; 6271 }; 6272 6273 6274 // The new class type must have the same or less qualifiers as the old type. 6275 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6276 Diag(New->getLocation(), 6277 diag::err_covariant_return_type_class_type_more_qualified) 6278 << New->getDeclName() << NewTy << OldTy; 6279 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6280 return true; 6281 }; 6282 6283 return false; 6284} 6285 6286bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6287 const CXXMethodDecl *Old) 6288{ 6289 if (Old->hasAttr<FinalAttr>()) { 6290 Diag(New->getLocation(), diag::err_final_function_overridden) 6291 << New->getDeclName(); 6292 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6293 return true; 6294 } 6295 6296 return false; 6297} 6298 6299/// \brief Mark the given method pure. 6300/// 6301/// \param Method the method to be marked pure. 6302/// 6303/// \param InitRange the source range that covers the "0" initializer. 6304bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6305 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6306 Method->setPure(); 6307 6308 // A class is abstract if at least one function is pure virtual. 6309 Method->getParent()->setAbstract(true); 6310 return false; 6311 } 6312 6313 if (!Method->isInvalidDecl()) 6314 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6315 << Method->getDeclName() << InitRange; 6316 return true; 6317} 6318 6319/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6320/// an initializer for the out-of-line declaration 'Dcl'. The scope 6321/// is a fresh scope pushed for just this purpose. 6322/// 6323/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6324/// static data member of class X, names should be looked up in the scope of 6325/// class X. 6326void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6327 // If there is no declaration, there was an error parsing it. 6328 Decl *D = Dcl.getAs<Decl>(); 6329 if (D == 0) return; 6330 6331 // We should only get called for declarations with scope specifiers, like: 6332 // int foo::bar; 6333 assert(D->isOutOfLine()); 6334 EnterDeclaratorContext(S, D->getDeclContext()); 6335} 6336 6337/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6338/// initializer for the out-of-line declaration 'Dcl'. 6339void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6340 // If there is no declaration, there was an error parsing it. 6341 Decl *D = Dcl.getAs<Decl>(); 6342 if (D == 0) return; 6343 6344 assert(D->isOutOfLine()); 6345 ExitDeclaratorContext(S); 6346} 6347 6348/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6349/// C++ if/switch/while/for statement. 6350/// e.g: "if (int x = f()) {...}" 6351Action::DeclResult 6352Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6353 // C++ 6.4p2: 6354 // The declarator shall not specify a function or an array. 6355 // The type-specifier-seq shall not contain typedef and shall not declare a 6356 // new class or enumeration. 6357 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6358 "Parser allowed 'typedef' as storage class of condition decl."); 6359 6360 TagDecl *OwnedTag = 0; 6361 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6362 QualType Ty = TInfo->getType(); 6363 6364 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6365 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6366 // would be created and CXXConditionDeclExpr wants a VarDecl. 6367 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6368 << D.getSourceRange(); 6369 return DeclResult(); 6370 } else if (OwnedTag && OwnedTag->isDefinition()) { 6371 // The type-specifier-seq shall not declare a new class or enumeration. 6372 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6373 } 6374 6375 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6376 if (!Dcl) 6377 return DeclResult(); 6378 6379 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6380 VD->setDeclaredInCondition(true); 6381 return Dcl; 6382} 6383 6384void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6385 bool DefinitionRequired) { 6386 // Ignore any vtable uses in unevaluated operands or for classes that do 6387 // not have a vtable. 6388 if (!Class->isDynamicClass() || Class->isDependentContext() || 6389 CurContext->isDependentContext() || 6390 ExprEvalContexts.back().Context == Unevaluated) 6391 return; 6392 6393 // Try to insert this class into the map. 6394 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6395 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6396 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6397 if (!Pos.second) { 6398 // If we already had an entry, check to see if we are promoting this vtable 6399 // to required a definition. If so, we need to reappend to the VTableUses 6400 // list, since we may have already processed the first entry. 6401 if (DefinitionRequired && !Pos.first->second) { 6402 Pos.first->second = true; 6403 } else { 6404 // Otherwise, we can early exit. 6405 return; 6406 } 6407 } 6408 6409 // Local classes need to have their virtual members marked 6410 // immediately. For all other classes, we mark their virtual members 6411 // at the end of the translation unit. 6412 if (Class->isLocalClass()) 6413 MarkVirtualMembersReferenced(Loc, Class); 6414 else 6415 VTableUses.push_back(std::make_pair(Class, Loc)); 6416} 6417 6418bool Sema::DefineUsedVTables() { 6419 // If any dynamic classes have their key function defined within 6420 // this translation unit, then those vtables are considered "used" and must 6421 // be emitted. 6422 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6423 if (const CXXMethodDecl *KeyFunction 6424 = Context.getKeyFunction(DynamicClasses[I])) { 6425 const FunctionDecl *Definition = 0; 6426 if (KeyFunction->getBody(Definition)) 6427 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6428 } 6429 } 6430 6431 if (VTableUses.empty()) 6432 return false; 6433 6434 // Note: The VTableUses vector could grow as a result of marking 6435 // the members of a class as "used", so we check the size each 6436 // time through the loop and prefer indices (with are stable) to 6437 // iterators (which are not). 6438 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6439 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6440 if (!Class) 6441 continue; 6442 6443 SourceLocation Loc = VTableUses[I].second; 6444 6445 // If this class has a key function, but that key function is 6446 // defined in another translation unit, we don't need to emit the 6447 // vtable even though we're using it. 6448 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6449 if (KeyFunction && !KeyFunction->getBody()) { 6450 switch (KeyFunction->getTemplateSpecializationKind()) { 6451 case TSK_Undeclared: 6452 case TSK_ExplicitSpecialization: 6453 case TSK_ExplicitInstantiationDeclaration: 6454 // The key function is in another translation unit. 6455 continue; 6456 6457 case TSK_ExplicitInstantiationDefinition: 6458 case TSK_ImplicitInstantiation: 6459 // We will be instantiating the key function. 6460 break; 6461 } 6462 } else if (!KeyFunction) { 6463 // If we have a class with no key function that is the subject 6464 // of an explicit instantiation declaration, suppress the 6465 // vtable; it will live with the explicit instantiation 6466 // definition. 6467 bool IsExplicitInstantiationDeclaration 6468 = Class->getTemplateSpecializationKind() 6469 == TSK_ExplicitInstantiationDeclaration; 6470 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6471 REnd = Class->redecls_end(); 6472 R != REnd; ++R) { 6473 TemplateSpecializationKind TSK 6474 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6475 if (TSK == TSK_ExplicitInstantiationDeclaration) 6476 IsExplicitInstantiationDeclaration = true; 6477 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6478 IsExplicitInstantiationDeclaration = false; 6479 break; 6480 } 6481 } 6482 6483 if (IsExplicitInstantiationDeclaration) 6484 continue; 6485 } 6486 6487 // Mark all of the virtual members of this class as referenced, so 6488 // that we can build a vtable. Then, tell the AST consumer that a 6489 // vtable for this class is required. 6490 MarkVirtualMembersReferenced(Loc, Class); 6491 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6492 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6493 6494 // Optionally warn if we're emitting a weak vtable. 6495 if (Class->getLinkage() == ExternalLinkage && 6496 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6497 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6498 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6499 } 6500 } 6501 VTableUses.clear(); 6502 6503 return true; 6504} 6505 6506void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6507 const CXXRecordDecl *RD) { 6508 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6509 e = RD->method_end(); i != e; ++i) { 6510 CXXMethodDecl *MD = *i; 6511 6512 // C++ [basic.def.odr]p2: 6513 // [...] A virtual member function is used if it is not pure. [...] 6514 if (MD->isVirtual() && !MD->isPure()) 6515 MarkDeclarationReferenced(Loc, MD); 6516 } 6517 6518 // Only classes that have virtual bases need a VTT. 6519 if (RD->getNumVBases() == 0) 6520 return; 6521 6522 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6523 e = RD->bases_end(); i != e; ++i) { 6524 const CXXRecordDecl *Base = 6525 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6526 if (i->isVirtual()) 6527 continue; 6528 if (Base->getNumVBases() == 0) 6529 continue; 6530 MarkVirtualMembersReferenced(Loc, Base); 6531 } 6532} 6533 6534/// SetIvarInitializers - This routine builds initialization ASTs for the 6535/// Objective-C implementation whose ivars need be initialized. 6536void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6537 if (!getLangOptions().CPlusPlus) 6538 return; 6539 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6540 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6541 CollectIvarsToConstructOrDestruct(OID, ivars); 6542 if (ivars.empty()) 6543 return; 6544 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6545 for (unsigned i = 0; i < ivars.size(); i++) { 6546 FieldDecl *Field = ivars[i]; 6547 if (Field->isInvalidDecl()) 6548 continue; 6549 6550 CXXBaseOrMemberInitializer *Member; 6551 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6552 InitializationKind InitKind = 6553 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6554 6555 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6556 Sema::OwningExprResult MemberInit = 6557 InitSeq.Perform(*this, InitEntity, InitKind, 6558 Sema::MultiExprArg(*this, 0, 0)); 6559 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6560 // Note, MemberInit could actually come back empty if no initialization 6561 // is required (e.g., because it would call a trivial default constructor) 6562 if (!MemberInit.get() || MemberInit.isInvalid()) 6563 continue; 6564 6565 Member = 6566 new (Context) CXXBaseOrMemberInitializer(Context, 6567 Field, SourceLocation(), 6568 SourceLocation(), 6569 MemberInit.takeAs<Expr>(), 6570 SourceLocation()); 6571 AllToInit.push_back(Member); 6572 6573 // Be sure that the destructor is accessible and is marked as referenced. 6574 if (const RecordType *RecordTy 6575 = Context.getBaseElementType(Field->getType()) 6576 ->getAs<RecordType>()) { 6577 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6578 if (CXXDestructorDecl *Destructor 6579 = const_cast<CXXDestructorDecl*>(RD->getDestructor())) { 6580 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6581 CheckDestructorAccess(Field->getLocation(), Destructor, 6582 PDiag(diag::err_access_dtor_ivar) 6583 << Context.getBaseElementType(Field->getType())); 6584 } 6585 } 6586 } 6587 ObjCImplementation->setIvarInitializers(Context, 6588 AllToInit.data(), AllToInit.size()); 6589 } 6590} 6591