SemaDeclCXX.cpp revision ff8819be64c53d71dcc0200ece9b2738041c80e2
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 "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isBlockVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 129 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 130 EqualLoc); 131 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 132 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 133 MultiExprArg(*this, &Arg, 1)); 134 if (Result.isInvalid()) 135 return true; 136 Arg = Result.takeAs<Expr>(); 137 138 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 139 140 // Okay: add the default argument to the parameter 141 Param->setDefaultArg(Arg); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 151 Expr *DefaultArg) { 152 if (!param || !DefaultArg) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 // Default arguments are only permitted in C++ 159 if (!getLangOptions().CPlusPlus) { 160 Diag(EqualLoc, diag::err_param_default_argument) 161 << DefaultArg->getSourceRange(); 162 Param->setInvalidDecl(); 163 return; 164 } 165 166 // Check that the default argument is well-formed 167 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 168 if (DefaultArgChecker.Visit(DefaultArg)) { 169 Param->setInvalidDecl(); 170 return; 171 } 172 173 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 174} 175 176/// ActOnParamUnparsedDefaultArgument - We've seen a default 177/// argument for a function parameter, but we can't parse it yet 178/// because we're inside a class definition. Note that this default 179/// argument will be parsed later. 180void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 181 SourceLocation EqualLoc, 182 SourceLocation ArgLoc) { 183 if (!param) 184 return; 185 186 ParmVarDecl *Param = cast<ParmVarDecl>(param); 187 if (Param) 188 Param->setUnparsedDefaultArg(); 189 190 UnparsedDefaultArgLocs[Param] = ArgLoc; 191} 192 193/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 194/// the default argument for the parameter param failed. 195void Sema::ActOnParamDefaultArgumentError(Decl *param) { 196 if (!param) 197 return; 198 199 ParmVarDecl *Param = cast<ParmVarDecl>(param); 200 201 Param->setInvalidDecl(); 202 203 UnparsedDefaultArgLocs.erase(Param); 204} 205 206/// CheckExtraCXXDefaultArguments - Check for any extra default 207/// arguments in the declarator, which is not a function declaration 208/// or definition and therefore is not permitted to have default 209/// arguments. This routine should be invoked for every declarator 210/// that is not a function declaration or definition. 211void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 212 // C++ [dcl.fct.default]p3 213 // A default argument expression shall be specified only in the 214 // parameter-declaration-clause of a function declaration or in a 215 // template-parameter (14.1). It shall not be specified for a 216 // parameter pack. If it is specified in a 217 // parameter-declaration-clause, it shall not occur within a 218 // declarator or abstract-declarator of a parameter-declaration. 219 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 220 DeclaratorChunk &chunk = D.getTypeObject(i); 221 if (chunk.Kind == DeclaratorChunk::Function) { 222 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 223 ParmVarDecl *Param = 224 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 225 if (Param->hasUnparsedDefaultArg()) { 226 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 227 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 228 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 229 delete Toks; 230 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 231 } else if (Param->getDefaultArg()) { 232 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 233 << Param->getDefaultArg()->getSourceRange(); 234 Param->setDefaultArg(0); 235 } 236 } 237 } 238 } 239} 240 241// MergeCXXFunctionDecl - Merge two declarations of the same C++ 242// function, once we already know that they have the same 243// type. Subroutine of MergeFunctionDecl. Returns true if there was an 244// error, false otherwise. 245bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 246 bool Invalid = false; 247 248 // C++ [dcl.fct.default]p4: 249 // For non-template functions, default arguments can be added in 250 // later declarations of a function in the same 251 // scope. Declarations in different scopes have completely 252 // distinct sets of default arguments. That is, declarations in 253 // inner scopes do not acquire default arguments from 254 // declarations in outer scopes, and vice versa. In a given 255 // function declaration, all parameters subsequent to a 256 // parameter with a default argument shall have default 257 // arguments supplied in this or previous declarations. A 258 // default argument shall not be redefined by a later 259 // declaration (not even to the same value). 260 // 261 // C++ [dcl.fct.default]p6: 262 // Except for member functions of class templates, the default arguments 263 // in a member function definition that appears outside of the class 264 // definition are added to the set of default arguments provided by the 265 // member function declaration in the class definition. 266 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 267 ParmVarDecl *OldParam = Old->getParamDecl(p); 268 ParmVarDecl *NewParam = New->getParamDecl(p); 269 270 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 271 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 272 // hint here. Alternatively, we could walk the type-source information 273 // for NewParam to find the last source location in the type... but it 274 // isn't worth the effort right now. This is the kind of test case that 275 // is hard to get right: 276 277 // int f(int); 278 // void g(int (*fp)(int) = f); 279 // void g(int (*fp)(int) = &f); 280 Diag(NewParam->getLocation(), 281 diag::err_param_default_argument_redefinition) 282 << NewParam->getDefaultArgRange(); 283 284 // Look for the function declaration where the default argument was 285 // actually written, which may be a declaration prior to Old. 286 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 287 Older; Older = Older->getPreviousDeclaration()) { 288 if (!Older->getParamDecl(p)->hasDefaultArg()) 289 break; 290 291 OldParam = Older->getParamDecl(p); 292 } 293 294 Diag(OldParam->getLocation(), diag::note_previous_definition) 295 << OldParam->getDefaultArgRange(); 296 Invalid = true; 297 } else if (OldParam->hasDefaultArg()) { 298 // Merge the old default argument into the new parameter. 299 // It's important to use getInit() here; getDefaultArg() 300 // strips off any top-level CXXExprWithTemporaries. 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getInit()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 Param->setDefaultArg(0); 413 } 414 } 415 } 416} 417 418/// isCurrentClassName - Determine whether the identifier II is the 419/// name of the class type currently being defined. In the case of 420/// nested classes, this will only return true if II is the name of 421/// the innermost class. 422bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 423 const CXXScopeSpec *SS) { 424 assert(getLangOptions().CPlusPlus && "No class names in C!"); 425 426 CXXRecordDecl *CurDecl; 427 if (SS && SS->isSet() && !SS->isInvalid()) { 428 DeclContext *DC = computeDeclContext(*SS, true); 429 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 430 } else 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 432 433 if (CurDecl && CurDecl->getIdentifier()) 434 return &II == CurDecl->getIdentifier(); 435 else 436 return false; 437} 438 439/// \brief Check the validity of a C++ base class specifier. 440/// 441/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 442/// and returns NULL otherwise. 443CXXBaseSpecifier * 444Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 445 SourceRange SpecifierRange, 446 bool Virtual, AccessSpecifier Access, 447 TypeSourceInfo *TInfo) { 448 QualType BaseType = TInfo->getType(); 449 450 // C++ [class.union]p1: 451 // A union shall not have base classes. 452 if (Class->isUnion()) { 453 Diag(Class->getLocation(), diag::err_base_clause_on_union) 454 << SpecifierRange; 455 return 0; 456 } 457 458 if (BaseType->isDependentType()) 459 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 460 Class->getTagKind() == TTK_Class, 461 Access, TInfo); 462 463 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 464 465 // Base specifiers must be record types. 466 if (!BaseType->isRecordType()) { 467 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 468 return 0; 469 } 470 471 // C++ [class.union]p1: 472 // A union shall not be used as a base class. 473 if (BaseType->isUnionType()) { 474 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 475 return 0; 476 } 477 478 // C++ [class.derived]p2: 479 // The class-name in a base-specifier shall not be an incompletely 480 // defined class. 481 if (RequireCompleteType(BaseLoc, BaseType, 482 PDiag(diag::err_incomplete_base_class) 483 << SpecifierRange)) { 484 Class->setInvalidDecl(); 485 return 0; 486 } 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 if (BaseDecl->isInvalidDecl()) 507 Class->setInvalidDecl(); 508 509 // Create the base specifier. 510 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 511 Class->getTagKind() == TTK_Class, 512 Access, TInfo); 513} 514 515void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 516 const CXXRecordDecl *BaseClass, 517 bool BaseIsVirtual) { 518 // A class with a non-empty base class is not empty. 519 // FIXME: Standard ref? 520 if (!BaseClass->isEmpty()) 521 Class->setEmpty(false); 522 523 // C++ [class.virtual]p1: 524 // A class that [...] inherits a virtual function is called a polymorphic 525 // class. 526 if (BaseClass->isPolymorphic()) 527 Class->setPolymorphic(true); 528 529 // C++ [dcl.init.aggr]p1: 530 // An aggregate is [...] a class with [...] no base classes [...]. 531 Class->setAggregate(false); 532 533 // C++ [class]p4: 534 // A POD-struct is an aggregate class... 535 Class->setPOD(false); 536 537 if (BaseIsVirtual) { 538 // C++ [class.ctor]p5: 539 // A constructor is trivial if its class has no virtual base classes. 540 Class->setHasTrivialConstructor(false); 541 542 // C++ [class.copy]p6: 543 // A copy constructor is trivial if its class has no virtual base classes. 544 Class->setHasTrivialCopyConstructor(false); 545 546 // C++ [class.copy]p11: 547 // A copy assignment operator is trivial if its class has no virtual 548 // base classes. 549 Class->setHasTrivialCopyAssignment(false); 550 551 // C++0x [meta.unary.prop] is_empty: 552 // T is a class type, but not a union type, with ... no virtual base 553 // classes 554 Class->setEmpty(false); 555 } else { 556 // C++ [class.ctor]p5: 557 // A constructor is trivial if all the direct base classes of its 558 // class have trivial constructors. 559 if (!BaseClass->hasTrivialConstructor()) 560 Class->setHasTrivialConstructor(false); 561 562 // C++ [class.copy]p6: 563 // A copy constructor is trivial if all the direct base classes of its 564 // class have trivial copy constructors. 565 if (!BaseClass->hasTrivialCopyConstructor()) 566 Class->setHasTrivialCopyConstructor(false); 567 568 // C++ [class.copy]p11: 569 // A copy assignment operator is trivial if all the direct base classes 570 // of its class have trivial copy assignment operators. 571 if (!BaseClass->hasTrivialCopyAssignment()) 572 Class->setHasTrivialCopyAssignment(false); 573 } 574 575 // C++ [class.ctor]p3: 576 // A destructor is trivial if all the direct base classes of its class 577 // have trivial destructors. 578 if (!BaseClass->hasTrivialDestructor()) 579 Class->setHasTrivialDestructor(false); 580} 581 582/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 583/// one entry in the base class list of a class specifier, for 584/// example: 585/// class foo : public bar, virtual private baz { 586/// 'public bar' and 'virtual private baz' are each base-specifiers. 587BaseResult 588Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 589 bool Virtual, AccessSpecifier Access, 590 ParsedType basetype, SourceLocation BaseLoc) { 591 if (!classdecl) 592 return true; 593 594 AdjustDeclIfTemplate(classdecl); 595 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 596 if (!Class) 597 return true; 598 599 TypeSourceInfo *TInfo = 0; 600 GetTypeFromParser(basetype, &TInfo); 601 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 602 Virtual, Access, TInfo)) 603 return BaseSpec; 604 605 return true; 606} 607 608/// \brief Performs the actual work of attaching the given base class 609/// specifiers to a C++ class. 610bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 611 unsigned NumBases) { 612 if (NumBases == 0) 613 return false; 614 615 // Used to keep track of which base types we have already seen, so 616 // that we can properly diagnose redundant direct base types. Note 617 // that the key is always the unqualified canonical type of the base 618 // class. 619 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 620 621 // Copy non-redundant base specifiers into permanent storage. 622 unsigned NumGoodBases = 0; 623 bool Invalid = false; 624 for (unsigned idx = 0; idx < NumBases; ++idx) { 625 QualType NewBaseType 626 = Context.getCanonicalType(Bases[idx]->getType()); 627 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 628 if (!Class->hasObjectMember()) { 629 if (const RecordType *FDTTy = 630 NewBaseType.getTypePtr()->getAs<RecordType>()) 631 if (FDTTy->getDecl()->hasObjectMember()) 632 Class->setHasObjectMember(true); 633 } 634 635 if (KnownBaseTypes[NewBaseType]) { 636 // C++ [class.mi]p3: 637 // A class shall not be specified as a direct base class of a 638 // derived class more than once. 639 Diag(Bases[idx]->getSourceRange().getBegin(), 640 diag::err_duplicate_base_class) 641 << KnownBaseTypes[NewBaseType]->getType() 642 << Bases[idx]->getSourceRange(); 643 644 // Delete the duplicate base class specifier; we're going to 645 // overwrite its pointer later. 646 Context.Deallocate(Bases[idx]); 647 648 Invalid = true; 649 } else { 650 // Okay, add this new base class. 651 KnownBaseTypes[NewBaseType] = Bases[idx]; 652 Bases[NumGoodBases++] = Bases[idx]; 653 } 654 } 655 656 // Attach the remaining base class specifiers to the derived class. 657 Class->setBases(Bases, NumGoodBases); 658 659 // Delete the remaining (good) base class specifiers, since their 660 // data has been copied into the CXXRecordDecl. 661 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 662 Context.Deallocate(Bases[idx]); 663 664 return Invalid; 665} 666 667/// ActOnBaseSpecifiers - Attach the given base specifiers to the 668/// class, after checking whether there are any duplicate base 669/// classes. 670void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 671 unsigned NumBases) { 672 if (!ClassDecl || !Bases || !NumBases) 673 return; 674 675 AdjustDeclIfTemplate(ClassDecl); 676 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 677 (CXXBaseSpecifier**)(Bases), NumBases); 678} 679 680static CXXRecordDecl *GetClassForType(QualType T) { 681 if (const RecordType *RT = T->getAs<RecordType>()) 682 return cast<CXXRecordDecl>(RT->getDecl()); 683 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 684 return ICT->getDecl(); 685 else 686 return 0; 687} 688 689/// \brief Determine whether the type \p Derived is a C++ class that is 690/// derived from the type \p Base. 691bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 692 if (!getLangOptions().CPlusPlus) 693 return false; 694 695 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 696 if (!DerivedRD) 697 return false; 698 699 CXXRecordDecl *BaseRD = GetClassForType(Base); 700 if (!BaseRD) 701 return false; 702 703 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 704 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 705} 706 707/// \brief Determine whether the type \p Derived is a C++ class that is 708/// derived from the type \p Base. 709bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 710 if (!getLangOptions().CPlusPlus) 711 return false; 712 713 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 714 if (!DerivedRD) 715 return false; 716 717 CXXRecordDecl *BaseRD = GetClassForType(Base); 718 if (!BaseRD) 719 return false; 720 721 return DerivedRD->isDerivedFrom(BaseRD, Paths); 722} 723 724void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 725 CXXCastPath &BasePathArray) { 726 assert(BasePathArray.empty() && "Base path array must be empty!"); 727 assert(Paths.isRecordingPaths() && "Must record paths!"); 728 729 const CXXBasePath &Path = Paths.front(); 730 731 // We first go backward and check if we have a virtual base. 732 // FIXME: It would be better if CXXBasePath had the base specifier for 733 // the nearest virtual base. 734 unsigned Start = 0; 735 for (unsigned I = Path.size(); I != 0; --I) { 736 if (Path[I - 1].Base->isVirtual()) { 737 Start = I - 1; 738 break; 739 } 740 } 741 742 // Now add all bases. 743 for (unsigned I = Start, E = Path.size(); I != E; ++I) 744 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 745} 746 747/// \brief Determine whether the given base path includes a virtual 748/// base class. 749bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 750 for (CXXCastPath::const_iterator B = BasePath.begin(), 751 BEnd = BasePath.end(); 752 B != BEnd; ++B) 753 if ((*B)->isVirtual()) 754 return true; 755 756 return false; 757} 758 759/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 760/// conversion (where Derived and Base are class types) is 761/// well-formed, meaning that the conversion is unambiguous (and 762/// that all of the base classes are accessible). Returns true 763/// and emits a diagnostic if the code is ill-formed, returns false 764/// otherwise. Loc is the location where this routine should point to 765/// if there is an error, and Range is the source range to highlight 766/// if there is an error. 767bool 768Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 769 unsigned InaccessibleBaseID, 770 unsigned AmbigiousBaseConvID, 771 SourceLocation Loc, SourceRange Range, 772 DeclarationName Name, 773 CXXCastPath *BasePath) { 774 // First, determine whether the path from Derived to Base is 775 // ambiguous. This is slightly more expensive than checking whether 776 // the Derived to Base conversion exists, because here we need to 777 // explore multiple paths to determine if there is an ambiguity. 778 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 779 /*DetectVirtual=*/false); 780 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 781 assert(DerivationOkay && 782 "Can only be used with a derived-to-base conversion"); 783 (void)DerivationOkay; 784 785 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 786 if (InaccessibleBaseID) { 787 // Check that the base class can be accessed. 788 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 789 InaccessibleBaseID)) { 790 case AR_inaccessible: 791 return true; 792 case AR_accessible: 793 case AR_dependent: 794 case AR_delayed: 795 break; 796 } 797 } 798 799 // Build a base path if necessary. 800 if (BasePath) 801 BuildBasePathArray(Paths, *BasePath); 802 return false; 803 } 804 805 // We know that the derived-to-base conversion is ambiguous, and 806 // we're going to produce a diagnostic. Perform the derived-to-base 807 // search just one more time to compute all of the possible paths so 808 // that we can print them out. This is more expensive than any of 809 // the previous derived-to-base checks we've done, but at this point 810 // performance isn't as much of an issue. 811 Paths.clear(); 812 Paths.setRecordingPaths(true); 813 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 814 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 815 (void)StillOkay; 816 817 // Build up a textual representation of the ambiguous paths, e.g., 818 // D -> B -> A, that will be used to illustrate the ambiguous 819 // conversions in the diagnostic. We only print one of the paths 820 // to each base class subobject. 821 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 822 823 Diag(Loc, AmbigiousBaseConvID) 824 << Derived << Base << PathDisplayStr << Range << Name; 825 return true; 826} 827 828bool 829Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 830 SourceLocation Loc, SourceRange Range, 831 CXXCastPath *BasePath, 832 bool IgnoreAccess) { 833 return CheckDerivedToBaseConversion(Derived, Base, 834 IgnoreAccess ? 0 835 : diag::err_upcast_to_inaccessible_base, 836 diag::err_ambiguous_derived_to_base_conv, 837 Loc, Range, DeclarationName(), 838 BasePath); 839} 840 841 842/// @brief Builds a string representing ambiguous paths from a 843/// specific derived class to different subobjects of the same base 844/// class. 845/// 846/// This function builds a string that can be used in error messages 847/// to show the different paths that one can take through the 848/// inheritance hierarchy to go from the derived class to different 849/// subobjects of a base class. The result looks something like this: 850/// @code 851/// struct D -> struct B -> struct A 852/// struct D -> struct C -> struct A 853/// @endcode 854std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 855 std::string PathDisplayStr; 856 std::set<unsigned> DisplayedPaths; 857 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 858 Path != Paths.end(); ++Path) { 859 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 860 // We haven't displayed a path to this particular base 861 // class subobject yet. 862 PathDisplayStr += "\n "; 863 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 864 for (CXXBasePath::const_iterator Element = Path->begin(); 865 Element != Path->end(); ++Element) 866 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 867 } 868 } 869 870 return PathDisplayStr; 871} 872 873//===----------------------------------------------------------------------===// 874// C++ class member Handling 875//===----------------------------------------------------------------------===// 876 877/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 878Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 879 SourceLocation ASLoc, 880 SourceLocation ColonLoc) { 881 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 882 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 883 ASLoc, ColonLoc); 884 CurContext->addHiddenDecl(ASDecl); 885 return ASDecl; 886} 887 888/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 889/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 890/// bitfield width if there is one and 'InitExpr' specifies the initializer if 891/// any. 892Decl * 893Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 894 MultiTemplateParamsArg TemplateParameterLists, 895 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 896 bool Deleted) { 897 const DeclSpec &DS = D.getDeclSpec(); 898 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 899 DeclarationName Name = NameInfo.getName(); 900 SourceLocation Loc = NameInfo.getLoc(); 901 Expr *BitWidth = static_cast<Expr*>(BW); 902 Expr *Init = static_cast<Expr*>(InitExpr); 903 904 assert(isa<CXXRecordDecl>(CurContext)); 905 assert(!DS.isFriendSpecified()); 906 907 bool isFunc = false; 908 if (D.isFunctionDeclarator()) 909 isFunc = true; 910 else if (D.getNumTypeObjects() == 0 && 911 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 912 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 913 isFunc = TDType->isFunctionType(); 914 } 915 916 // C++ 9.2p6: A member shall not be declared to have automatic storage 917 // duration (auto, register) or with the extern storage-class-specifier. 918 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 919 // data members and cannot be applied to names declared const or static, 920 // and cannot be applied to reference members. 921 switch (DS.getStorageClassSpec()) { 922 case DeclSpec::SCS_unspecified: 923 case DeclSpec::SCS_typedef: 924 case DeclSpec::SCS_static: 925 // FALL THROUGH. 926 break; 927 case DeclSpec::SCS_mutable: 928 if (isFunc) { 929 if (DS.getStorageClassSpecLoc().isValid()) 930 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 931 else 932 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 933 934 // FIXME: It would be nicer if the keyword was ignored only for this 935 // declarator. Otherwise we could get follow-up errors. 936 D.getMutableDeclSpec().ClearStorageClassSpecs(); 937 } 938 break; 939 default: 940 if (DS.getStorageClassSpecLoc().isValid()) 941 Diag(DS.getStorageClassSpecLoc(), 942 diag::err_storageclass_invalid_for_member); 943 else 944 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 945 D.getMutableDeclSpec().ClearStorageClassSpecs(); 946 } 947 948 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 949 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 950 !isFunc); 951 952 Decl *Member; 953 if (isInstField) { 954 // FIXME: Check for template parameters! 955 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 956 AS); 957 assert(Member && "HandleField never returns null"); 958 } else { 959 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 960 if (!Member) { 961 return 0; 962 } 963 964 // Non-instance-fields can't have a bitfield. 965 if (BitWidth) { 966 if (Member->isInvalidDecl()) { 967 // don't emit another diagnostic. 968 } else if (isa<VarDecl>(Member)) { 969 // C++ 9.6p3: A bit-field shall not be a static member. 970 // "static member 'A' cannot be a bit-field" 971 Diag(Loc, diag::err_static_not_bitfield) 972 << Name << BitWidth->getSourceRange(); 973 } else if (isa<TypedefDecl>(Member)) { 974 // "typedef member 'x' cannot be a bit-field" 975 Diag(Loc, diag::err_typedef_not_bitfield) 976 << Name << BitWidth->getSourceRange(); 977 } else { 978 // A function typedef ("typedef int f(); f a;"). 979 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 980 Diag(Loc, diag::err_not_integral_type_bitfield) 981 << Name << cast<ValueDecl>(Member)->getType() 982 << BitWidth->getSourceRange(); 983 } 984 985 BitWidth = 0; 986 Member->setInvalidDecl(); 987 } 988 989 Member->setAccess(AS); 990 991 // If we have declared a member function template, set the access of the 992 // templated declaration as well. 993 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 994 FunTmpl->getTemplatedDecl()->setAccess(AS); 995 } 996 997 assert((Name || isInstField) && "No identifier for non-field ?"); 998 999 if (Init) 1000 AddInitializerToDecl(Member, Init, false); 1001 if (Deleted) // FIXME: Source location is not very good. 1002 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1003 1004 if (isInstField) { 1005 FieldCollector->Add(cast<FieldDecl>(Member)); 1006 return 0; 1007 } 1008 return Member; 1009} 1010 1011/// \brief Find the direct and/or virtual base specifiers that 1012/// correspond to the given base type, for use in base initialization 1013/// within a constructor. 1014static bool FindBaseInitializer(Sema &SemaRef, 1015 CXXRecordDecl *ClassDecl, 1016 QualType BaseType, 1017 const CXXBaseSpecifier *&DirectBaseSpec, 1018 const CXXBaseSpecifier *&VirtualBaseSpec) { 1019 // First, check for a direct base class. 1020 DirectBaseSpec = 0; 1021 for (CXXRecordDecl::base_class_const_iterator Base 1022 = ClassDecl->bases_begin(); 1023 Base != ClassDecl->bases_end(); ++Base) { 1024 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1025 // We found a direct base of this type. That's what we're 1026 // initializing. 1027 DirectBaseSpec = &*Base; 1028 break; 1029 } 1030 } 1031 1032 // Check for a virtual base class. 1033 // FIXME: We might be able to short-circuit this if we know in advance that 1034 // there are no virtual bases. 1035 VirtualBaseSpec = 0; 1036 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1037 // We haven't found a base yet; search the class hierarchy for a 1038 // virtual base class. 1039 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1040 /*DetectVirtual=*/false); 1041 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1042 BaseType, Paths)) { 1043 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1044 Path != Paths.end(); ++Path) { 1045 if (Path->back().Base->isVirtual()) { 1046 VirtualBaseSpec = Path->back().Base; 1047 break; 1048 } 1049 } 1050 } 1051 } 1052 1053 return DirectBaseSpec || VirtualBaseSpec; 1054} 1055 1056/// ActOnMemInitializer - Handle a C++ member initializer. 1057MemInitResult 1058Sema::ActOnMemInitializer(Decl *ConstructorD, 1059 Scope *S, 1060 CXXScopeSpec &SS, 1061 IdentifierInfo *MemberOrBase, 1062 ParsedType TemplateTypeTy, 1063 SourceLocation IdLoc, 1064 SourceLocation LParenLoc, 1065 ExprTy **Args, unsigned NumArgs, 1066 SourceLocation RParenLoc) { 1067 if (!ConstructorD) 1068 return true; 1069 1070 AdjustDeclIfTemplate(ConstructorD); 1071 1072 CXXConstructorDecl *Constructor 1073 = dyn_cast<CXXConstructorDecl>(ConstructorD); 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()->getRedeclContext()->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 } else if (isa<SizeOfAlignOfExpr>(S)) { 1250 // sizeof/alignof doesn't reference contents, do not warn. 1251 return false; 1252 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1253 // address-of doesn't reference contents (the pointer may be dereferenced 1254 // in the same expression but it would be rare; and weird). 1255 if (UOE->getOpcode() == UO_AddrOf) 1256 return false; 1257 } 1258 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1259 it != e; ++it) { 1260 if (!*it) { 1261 // An expression such as 'member(arg ?: "")' may trigger this. 1262 continue; 1263 } 1264 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1265 return true; 1266 } 1267 return false; 1268} 1269 1270MemInitResult 1271Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1272 unsigned NumArgs, SourceLocation IdLoc, 1273 SourceLocation LParenLoc, 1274 SourceLocation RParenLoc) { 1275 // Diagnose value-uses of fields to initialize themselves, e.g. 1276 // foo(foo) 1277 // where foo is not also a parameter to the constructor. 1278 // TODO: implement -Wuninitialized and fold this into that framework. 1279 for (unsigned i = 0; i < NumArgs; ++i) { 1280 SourceLocation L; 1281 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1282 // FIXME: Return true in the case when other fields are used before being 1283 // uninitialized. For example, let this field be the i'th field. When 1284 // initializing the i'th field, throw a warning if any of the >= i'th 1285 // fields are used, as they are not yet initialized. 1286 // Right now we are only handling the case where the i'th field uses 1287 // itself in its initializer. 1288 Diag(L, diag::warn_field_is_uninit); 1289 } 1290 } 1291 1292 bool HasDependentArg = false; 1293 for (unsigned i = 0; i < NumArgs; i++) 1294 HasDependentArg |= Args[i]->isTypeDependent(); 1295 1296 if (Member->getType()->isDependentType() || HasDependentArg) { 1297 // Can't check initialization for a member of dependent type or when 1298 // any of the arguments are type-dependent expressions. 1299 Expr *Init 1300 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1301 RParenLoc); 1302 1303 // Erase any temporaries within this evaluation context; we're not 1304 // going to track them in the AST, since we'll be rebuilding the 1305 // ASTs during template instantiation. 1306 ExprTemporaries.erase( 1307 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1308 ExprTemporaries.end()); 1309 1310 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1311 LParenLoc, 1312 Init, 1313 RParenLoc); 1314 1315 } 1316 1317 if (Member->isInvalidDecl()) 1318 return true; 1319 1320 // Initialize the member. 1321 InitializedEntity MemberEntity = 1322 InitializedEntity::InitializeMember(Member, 0); 1323 InitializationKind Kind = 1324 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1325 1326 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1327 1328 ExprResult MemberInit = 1329 InitSeq.Perform(*this, MemberEntity, Kind, 1330 MultiExprArg(*this, Args, NumArgs), 0); 1331 if (MemberInit.isInvalid()) 1332 return true; 1333 1334 // C++0x [class.base.init]p7: 1335 // The initialization of each base and member constitutes a 1336 // full-expression. 1337 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1338 if (MemberInit.isInvalid()) 1339 return true; 1340 1341 // If we are in a dependent context, template instantiation will 1342 // perform this type-checking again. Just save the arguments that we 1343 // received in a ParenListExpr. 1344 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1345 // of the information that we have about the member 1346 // initializer. However, deconstructing the ASTs is a dicey process, 1347 // and this approach is far more likely to get the corner cases right. 1348 if (CurContext->isDependentContext()) { 1349 // Bump the reference count of all of the arguments. 1350 for (unsigned I = 0; I != NumArgs; ++I) 1351 Args[I]->Retain(); 1352 1353 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1354 RParenLoc); 1355 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1356 LParenLoc, 1357 Init, 1358 RParenLoc); 1359 } 1360 1361 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1362 LParenLoc, 1363 MemberInit.get(), 1364 RParenLoc); 1365} 1366 1367MemInitResult 1368Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1369 Expr **Args, unsigned NumArgs, 1370 SourceLocation LParenLoc, SourceLocation RParenLoc, 1371 CXXRecordDecl *ClassDecl) { 1372 bool HasDependentArg = false; 1373 for (unsigned i = 0; i < NumArgs; i++) 1374 HasDependentArg |= Args[i]->isTypeDependent(); 1375 1376 SourceLocation BaseLoc 1377 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1378 1379 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1380 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1381 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1382 1383 // C++ [class.base.init]p2: 1384 // [...] Unless the mem-initializer-id names a nonstatic data 1385 // member of the constructor’s class or a direct or virtual base 1386 // of that class, the mem-initializer is ill-formed. A 1387 // mem-initializer-list can initialize a base class using any 1388 // name that denotes that base class type. 1389 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1390 1391 // Check for direct and virtual base classes. 1392 const CXXBaseSpecifier *DirectBaseSpec = 0; 1393 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1394 if (!Dependent) { 1395 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1396 VirtualBaseSpec); 1397 1398 // C++ [base.class.init]p2: 1399 // Unless the mem-initializer-id names a nonstatic data member of the 1400 // constructor's class or a direct or virtual base of that class, the 1401 // mem-initializer is ill-formed. 1402 if (!DirectBaseSpec && !VirtualBaseSpec) { 1403 // If the class has any dependent bases, then it's possible that 1404 // one of those types will resolve to the same type as 1405 // BaseType. Therefore, just treat this as a dependent base 1406 // class initialization. FIXME: Should we try to check the 1407 // initialization anyway? It seems odd. 1408 if (ClassDecl->hasAnyDependentBases()) 1409 Dependent = true; 1410 else 1411 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1412 << BaseType << Context.getTypeDeclType(ClassDecl) 1413 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1414 } 1415 } 1416 1417 if (Dependent) { 1418 // Can't check initialization for a base of dependent type or when 1419 // any of the arguments are type-dependent expressions. 1420 ExprResult BaseInit 1421 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1422 RParenLoc)); 1423 1424 // Erase any temporaries within this evaluation context; we're not 1425 // going to track them in the AST, since we'll be rebuilding the 1426 // ASTs during template instantiation. 1427 ExprTemporaries.erase( 1428 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1429 ExprTemporaries.end()); 1430 1431 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1432 /*IsVirtual=*/false, 1433 LParenLoc, 1434 BaseInit.takeAs<Expr>(), 1435 RParenLoc); 1436 } 1437 1438 // C++ [base.class.init]p2: 1439 // If a mem-initializer-id is ambiguous because it designates both 1440 // a direct non-virtual base class and an inherited virtual base 1441 // class, the mem-initializer is ill-formed. 1442 if (DirectBaseSpec && VirtualBaseSpec) 1443 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1444 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1445 1446 CXXBaseSpecifier *BaseSpec 1447 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1448 if (!BaseSpec) 1449 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1450 1451 // Initialize the base. 1452 InitializedEntity BaseEntity = 1453 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1454 InitializationKind Kind = 1455 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1456 1457 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1458 1459 ExprResult BaseInit = 1460 InitSeq.Perform(*this, BaseEntity, Kind, 1461 MultiExprArg(*this, Args, NumArgs), 0); 1462 if (BaseInit.isInvalid()) 1463 return true; 1464 1465 // C++0x [class.base.init]p7: 1466 // The initialization of each base and member constitutes a 1467 // full-expression. 1468 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1469 if (BaseInit.isInvalid()) 1470 return true; 1471 1472 // If we are in a dependent context, template instantiation will 1473 // perform this type-checking again. Just save the arguments that we 1474 // received in a ParenListExpr. 1475 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1476 // of the information that we have about the base 1477 // initializer. However, deconstructing the ASTs is a dicey process, 1478 // and this approach is far more likely to get the corner cases right. 1479 if (CurContext->isDependentContext()) { 1480 // Bump the reference count of all of the arguments. 1481 for (unsigned I = 0; I != NumArgs; ++I) 1482 Args[I]->Retain(); 1483 1484 ExprResult Init 1485 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1486 RParenLoc)); 1487 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1488 BaseSpec->isVirtual(), 1489 LParenLoc, 1490 Init.takeAs<Expr>(), 1491 RParenLoc); 1492 } 1493 1494 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1495 BaseSpec->isVirtual(), 1496 LParenLoc, 1497 BaseInit.takeAs<Expr>(), 1498 RParenLoc); 1499} 1500 1501/// ImplicitInitializerKind - How an implicit base or member initializer should 1502/// initialize its base or member. 1503enum ImplicitInitializerKind { 1504 IIK_Default, 1505 IIK_Copy, 1506 IIK_Move 1507}; 1508 1509static bool 1510BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1511 ImplicitInitializerKind ImplicitInitKind, 1512 CXXBaseSpecifier *BaseSpec, 1513 bool IsInheritedVirtualBase, 1514 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1515 InitializedEntity InitEntity 1516 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1517 IsInheritedVirtualBase); 1518 1519 ExprResult BaseInit; 1520 1521 switch (ImplicitInitKind) { 1522 case IIK_Default: { 1523 InitializationKind InitKind 1524 = InitializationKind::CreateDefault(Constructor->getLocation()); 1525 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1526 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1527 MultiExprArg(SemaRef, 0, 0)); 1528 break; 1529 } 1530 1531 case IIK_Copy: { 1532 ParmVarDecl *Param = Constructor->getParamDecl(0); 1533 QualType ParamType = Param->getType().getNonReferenceType(); 1534 1535 Expr *CopyCtorArg = 1536 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1537 Constructor->getLocation(), ParamType, 0); 1538 1539 // Cast to the base class to avoid ambiguities. 1540 QualType ArgTy = 1541 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1542 ParamType.getQualifiers()); 1543 1544 CXXCastPath BasePath; 1545 BasePath.push_back(BaseSpec); 1546 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1547 CK_UncheckedDerivedToBase, 1548 VK_LValue, &BasePath); 1549 1550 InitializationKind InitKind 1551 = InitializationKind::CreateDirect(Constructor->getLocation(), 1552 SourceLocation(), SourceLocation()); 1553 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1554 &CopyCtorArg, 1); 1555 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1556 MultiExprArg(&CopyCtorArg, 1)); 1557 break; 1558 } 1559 1560 case IIK_Move: 1561 assert(false && "Unhandled initializer kind!"); 1562 } 1563 1564 if (BaseInit.isInvalid()) 1565 return true; 1566 1567 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1568 if (BaseInit.isInvalid()) 1569 return true; 1570 1571 CXXBaseInit = 1572 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1573 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1574 SourceLocation()), 1575 BaseSpec->isVirtual(), 1576 SourceLocation(), 1577 BaseInit.takeAs<Expr>(), 1578 SourceLocation()); 1579 1580 return false; 1581} 1582 1583static bool 1584BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1585 ImplicitInitializerKind ImplicitInitKind, 1586 FieldDecl *Field, 1587 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1588 if (Field->isInvalidDecl()) 1589 return true; 1590 1591 SourceLocation Loc = Constructor->getLocation(); 1592 1593 if (ImplicitInitKind == IIK_Copy) { 1594 ParmVarDecl *Param = Constructor->getParamDecl(0); 1595 QualType ParamType = Param->getType().getNonReferenceType(); 1596 1597 Expr *MemberExprBase = 1598 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1599 Loc, ParamType, 0); 1600 1601 // Build a reference to this field within the parameter. 1602 CXXScopeSpec SS; 1603 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1604 Sema::LookupMemberName); 1605 MemberLookup.addDecl(Field, AS_public); 1606 MemberLookup.resolveKind(); 1607 ExprResult CopyCtorArg 1608 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1609 ParamType, Loc, 1610 /*IsArrow=*/false, 1611 SS, 1612 /*FirstQualifierInScope=*/0, 1613 MemberLookup, 1614 /*TemplateArgs=*/0); 1615 if (CopyCtorArg.isInvalid()) 1616 return true; 1617 1618 // When the field we are copying is an array, create index variables for 1619 // each dimension of the array. We use these index variables to subscript 1620 // the source array, and other clients (e.g., CodeGen) will perform the 1621 // necessary iteration with these index variables. 1622 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1623 QualType BaseType = Field->getType(); 1624 QualType SizeType = SemaRef.Context.getSizeType(); 1625 while (const ConstantArrayType *Array 1626 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1627 // Create the iteration variable for this array index. 1628 IdentifierInfo *IterationVarName = 0; 1629 { 1630 llvm::SmallString<8> Str; 1631 llvm::raw_svector_ostream OS(Str); 1632 OS << "__i" << IndexVariables.size(); 1633 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1634 } 1635 VarDecl *IterationVar 1636 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1637 IterationVarName, SizeType, 1638 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1639 SC_None, SC_None); 1640 IndexVariables.push_back(IterationVar); 1641 1642 // Create a reference to the iteration variable. 1643 ExprResult IterationVarRef 1644 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1645 assert(!IterationVarRef.isInvalid() && 1646 "Reference to invented variable cannot fail!"); 1647 1648 // Subscript the array with this iteration variable. 1649 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1650 Loc, 1651 IterationVarRef.take(), 1652 Loc); 1653 if (CopyCtorArg.isInvalid()) 1654 return true; 1655 1656 BaseType = Array->getElementType(); 1657 } 1658 1659 // Construct the entity that we will be initializing. For an array, this 1660 // will be first element in the array, which may require several levels 1661 // of array-subscript entities. 1662 llvm::SmallVector<InitializedEntity, 4> Entities; 1663 Entities.reserve(1 + IndexVariables.size()); 1664 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1665 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1666 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1667 0, 1668 Entities.back())); 1669 1670 // Direct-initialize to use the copy constructor. 1671 InitializationKind InitKind = 1672 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1673 1674 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1675 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1676 &CopyCtorArgE, 1); 1677 1678 ExprResult MemberInit 1679 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1680 MultiExprArg(&CopyCtorArgE, 1)); 1681 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1682 if (MemberInit.isInvalid()) 1683 return true; 1684 1685 CXXMemberInit 1686 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1687 MemberInit.takeAs<Expr>(), Loc, 1688 IndexVariables.data(), 1689 IndexVariables.size()); 1690 return false; 1691 } 1692 1693 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1694 1695 QualType FieldBaseElementType = 1696 SemaRef.Context.getBaseElementType(Field->getType()); 1697 1698 if (FieldBaseElementType->isRecordType()) { 1699 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1700 InitializationKind InitKind = 1701 InitializationKind::CreateDefault(Loc); 1702 1703 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1704 ExprResult MemberInit = 1705 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1706 if (MemberInit.isInvalid()) 1707 return true; 1708 1709 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1710 if (MemberInit.isInvalid()) 1711 return true; 1712 1713 CXXMemberInit = 1714 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1715 Field, Loc, Loc, 1716 MemberInit.get(), 1717 Loc); 1718 return false; 1719 } 1720 1721 if (FieldBaseElementType->isReferenceType()) { 1722 SemaRef.Diag(Constructor->getLocation(), 1723 diag::err_uninitialized_member_in_ctor) 1724 << (int)Constructor->isImplicit() 1725 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1726 << 0 << Field->getDeclName(); 1727 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1728 return true; 1729 } 1730 1731 if (FieldBaseElementType.isConstQualified()) { 1732 SemaRef.Diag(Constructor->getLocation(), 1733 diag::err_uninitialized_member_in_ctor) 1734 << (int)Constructor->isImplicit() 1735 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1736 << 1 << Field->getDeclName(); 1737 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1738 return true; 1739 } 1740 1741 // Nothing to initialize. 1742 CXXMemberInit = 0; 1743 return false; 1744} 1745 1746namespace { 1747struct BaseAndFieldInfo { 1748 Sema &S; 1749 CXXConstructorDecl *Ctor; 1750 bool AnyErrorsInInits; 1751 ImplicitInitializerKind IIK; 1752 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1753 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1754 1755 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1756 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1757 // FIXME: Handle implicit move constructors. 1758 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1759 IIK = IIK_Copy; 1760 else 1761 IIK = IIK_Default; 1762 } 1763}; 1764} 1765 1766static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1767 FieldDecl *Top, FieldDecl *Field, 1768 CXXBaseOrMemberInitializer *Init) { 1769 // If the member doesn't need to be initialized, Init will still be null. 1770 if (!Init) 1771 return; 1772 1773 Info.AllToInit.push_back(Init); 1774 if (Field != Top) { 1775 Init->setMember(Top); 1776 Init->setAnonUnionMember(Field); 1777 } 1778} 1779 1780static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1781 FieldDecl *Top, FieldDecl *Field) { 1782 1783 // Overwhelmingly common case: we have a direct initializer for this field. 1784 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1785 RecordFieldInitializer(Info, Top, Field, Init); 1786 return false; 1787 } 1788 1789 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1790 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1791 assert(FieldClassType && "anonymous struct/union without record type"); 1792 CXXRecordDecl *FieldClassDecl 1793 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1794 1795 // Even though union members never have non-trivial default 1796 // constructions in C++03, we still build member initializers for aggregate 1797 // record types which can be union members, and C++0x allows non-trivial 1798 // default constructors for union members, so we ensure that only one 1799 // member is initialized for these. 1800 if (FieldClassDecl->isUnion()) { 1801 // First check for an explicit initializer for one field. 1802 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1803 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1804 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1805 RecordFieldInitializer(Info, Top, *FA, Init); 1806 1807 // Once we've initialized a field of an anonymous union, the union 1808 // field in the class is also initialized, so exit immediately. 1809 return false; 1810 } else if ((*FA)->isAnonymousStructOrUnion()) { 1811 if (CollectFieldInitializer(Info, Top, *FA)) 1812 return true; 1813 } 1814 } 1815 1816 // Fallthrough and construct a default initializer for the union as 1817 // a whole, which can call its default constructor if such a thing exists 1818 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1819 // behavior going forward with C++0x, when anonymous unions there are 1820 // finalized, we should revisit this. 1821 } else { 1822 // For structs, we simply descend through to initialize all members where 1823 // necessary. 1824 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1825 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1826 if (CollectFieldInitializer(Info, Top, *FA)) 1827 return true; 1828 } 1829 } 1830 } 1831 1832 // Don't try to build an implicit initializer if there were semantic 1833 // errors in any of the initializers (and therefore we might be 1834 // missing some that the user actually wrote). 1835 if (Info.AnyErrorsInInits) 1836 return false; 1837 1838 CXXBaseOrMemberInitializer *Init = 0; 1839 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1840 return true; 1841 1842 RecordFieldInitializer(Info, Top, Field, Init); 1843 return false; 1844} 1845 1846bool 1847Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1848 CXXBaseOrMemberInitializer **Initializers, 1849 unsigned NumInitializers, 1850 bool AnyErrors) { 1851 if (Constructor->getDeclContext()->isDependentContext()) { 1852 // Just store the initializers as written, they will be checked during 1853 // instantiation. 1854 if (NumInitializers > 0) { 1855 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1856 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1857 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1858 memcpy(baseOrMemberInitializers, Initializers, 1859 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1860 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1861 } 1862 1863 return false; 1864 } 1865 1866 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1867 1868 // We need to build the initializer AST according to order of construction 1869 // and not what user specified in the Initializers list. 1870 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1871 if (!ClassDecl) 1872 return true; 1873 1874 bool HadError = false; 1875 1876 for (unsigned i = 0; i < NumInitializers; i++) { 1877 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1878 1879 if (Member->isBaseInitializer()) 1880 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1881 else 1882 Info.AllBaseFields[Member->getMember()] = Member; 1883 } 1884 1885 // Keep track of the direct virtual bases. 1886 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1887 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1888 E = ClassDecl->bases_end(); I != E; ++I) { 1889 if (I->isVirtual()) 1890 DirectVBases.insert(I); 1891 } 1892 1893 // Push virtual bases before others. 1894 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1895 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1896 1897 if (CXXBaseOrMemberInitializer *Value 1898 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1899 Info.AllToInit.push_back(Value); 1900 } else if (!AnyErrors) { 1901 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1902 CXXBaseOrMemberInitializer *CXXBaseInit; 1903 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1904 VBase, IsInheritedVirtualBase, 1905 CXXBaseInit)) { 1906 HadError = true; 1907 continue; 1908 } 1909 1910 Info.AllToInit.push_back(CXXBaseInit); 1911 } 1912 } 1913 1914 // Non-virtual bases. 1915 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1916 E = ClassDecl->bases_end(); Base != E; ++Base) { 1917 // Virtuals are in the virtual base list and already constructed. 1918 if (Base->isVirtual()) 1919 continue; 1920 1921 if (CXXBaseOrMemberInitializer *Value 1922 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1923 Info.AllToInit.push_back(Value); 1924 } else if (!AnyErrors) { 1925 CXXBaseOrMemberInitializer *CXXBaseInit; 1926 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1927 Base, /*IsInheritedVirtualBase=*/false, 1928 CXXBaseInit)) { 1929 HadError = true; 1930 continue; 1931 } 1932 1933 Info.AllToInit.push_back(CXXBaseInit); 1934 } 1935 } 1936 1937 // Fields. 1938 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1939 E = ClassDecl->field_end(); Field != E; ++Field) { 1940 if ((*Field)->getType()->isIncompleteArrayType()) { 1941 assert(ClassDecl->hasFlexibleArrayMember() && 1942 "Incomplete array type is not valid"); 1943 continue; 1944 } 1945 if (CollectFieldInitializer(Info, *Field, *Field)) 1946 HadError = true; 1947 } 1948 1949 NumInitializers = Info.AllToInit.size(); 1950 if (NumInitializers > 0) { 1951 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1952 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1953 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1954 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1955 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1956 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1957 1958 // Constructors implicitly reference the base and member 1959 // destructors. 1960 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1961 Constructor->getParent()); 1962 } 1963 1964 return HadError; 1965} 1966 1967static void *GetKeyForTopLevelField(FieldDecl *Field) { 1968 // For anonymous unions, use the class declaration as the key. 1969 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1970 if (RT->getDecl()->isAnonymousStructOrUnion()) 1971 return static_cast<void *>(RT->getDecl()); 1972 } 1973 return static_cast<void *>(Field); 1974} 1975 1976static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1977 return Context.getCanonicalType(BaseType).getTypePtr(); 1978} 1979 1980static void *GetKeyForMember(ASTContext &Context, 1981 CXXBaseOrMemberInitializer *Member, 1982 bool MemberMaybeAnon = false) { 1983 if (!Member->isMemberInitializer()) 1984 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1985 1986 // For fields injected into the class via declaration of an anonymous union, 1987 // use its anonymous union class declaration as the unique key. 1988 FieldDecl *Field = Member->getMember(); 1989 1990 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1991 // data member of the class. Data member used in the initializer list is 1992 // in AnonUnionMember field. 1993 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1994 Field = Member->getAnonUnionMember(); 1995 1996 // If the field is a member of an anonymous struct or union, our key 1997 // is the anonymous record decl that's a direct child of the class. 1998 RecordDecl *RD = Field->getParent(); 1999 if (RD->isAnonymousStructOrUnion()) { 2000 while (true) { 2001 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2002 if (Parent->isAnonymousStructOrUnion()) 2003 RD = Parent; 2004 else 2005 break; 2006 } 2007 2008 return static_cast<void *>(RD); 2009 } 2010 2011 return static_cast<void *>(Field); 2012} 2013 2014static void 2015DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2016 const CXXConstructorDecl *Constructor, 2017 CXXBaseOrMemberInitializer **Inits, 2018 unsigned NumInits) { 2019 if (Constructor->getDeclContext()->isDependentContext()) 2020 return; 2021 2022 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2023 == Diagnostic::Ignored) 2024 return; 2025 2026 // Build the list of bases and members in the order that they'll 2027 // actually be initialized. The explicit initializers should be in 2028 // this same order but may be missing things. 2029 llvm::SmallVector<const void*, 32> IdealInitKeys; 2030 2031 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2032 2033 // 1. Virtual bases. 2034 for (CXXRecordDecl::base_class_const_iterator VBase = 2035 ClassDecl->vbases_begin(), 2036 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2037 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2038 2039 // 2. Non-virtual bases. 2040 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2041 E = ClassDecl->bases_end(); Base != E; ++Base) { 2042 if (Base->isVirtual()) 2043 continue; 2044 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2045 } 2046 2047 // 3. Direct fields. 2048 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2049 E = ClassDecl->field_end(); Field != E; ++Field) 2050 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2051 2052 unsigned NumIdealInits = IdealInitKeys.size(); 2053 unsigned IdealIndex = 0; 2054 2055 CXXBaseOrMemberInitializer *PrevInit = 0; 2056 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2057 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2058 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2059 2060 // Scan forward to try to find this initializer in the idealized 2061 // initializers list. 2062 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2063 if (InitKey == IdealInitKeys[IdealIndex]) 2064 break; 2065 2066 // If we didn't find this initializer, it must be because we 2067 // scanned past it on a previous iteration. That can only 2068 // happen if we're out of order; emit a warning. 2069 if (IdealIndex == NumIdealInits && PrevInit) { 2070 Sema::SemaDiagnosticBuilder D = 2071 SemaRef.Diag(PrevInit->getSourceLocation(), 2072 diag::warn_initializer_out_of_order); 2073 2074 if (PrevInit->isMemberInitializer()) 2075 D << 0 << PrevInit->getMember()->getDeclName(); 2076 else 2077 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2078 2079 if (Init->isMemberInitializer()) 2080 D << 0 << Init->getMember()->getDeclName(); 2081 else 2082 D << 1 << Init->getBaseClassInfo()->getType(); 2083 2084 // Move back to the initializer's location in the ideal list. 2085 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2086 if (InitKey == IdealInitKeys[IdealIndex]) 2087 break; 2088 2089 assert(IdealIndex != NumIdealInits && 2090 "initializer not found in initializer list"); 2091 } 2092 2093 PrevInit = Init; 2094 } 2095} 2096 2097namespace { 2098bool CheckRedundantInit(Sema &S, 2099 CXXBaseOrMemberInitializer *Init, 2100 CXXBaseOrMemberInitializer *&PrevInit) { 2101 if (!PrevInit) { 2102 PrevInit = Init; 2103 return false; 2104 } 2105 2106 if (FieldDecl *Field = Init->getMember()) 2107 S.Diag(Init->getSourceLocation(), 2108 diag::err_multiple_mem_initialization) 2109 << Field->getDeclName() 2110 << Init->getSourceRange(); 2111 else { 2112 Type *BaseClass = Init->getBaseClass(); 2113 assert(BaseClass && "neither field nor base"); 2114 S.Diag(Init->getSourceLocation(), 2115 diag::err_multiple_base_initialization) 2116 << QualType(BaseClass, 0) 2117 << Init->getSourceRange(); 2118 } 2119 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2120 << 0 << PrevInit->getSourceRange(); 2121 2122 return true; 2123} 2124 2125typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2126typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2127 2128bool CheckRedundantUnionInit(Sema &S, 2129 CXXBaseOrMemberInitializer *Init, 2130 RedundantUnionMap &Unions) { 2131 FieldDecl *Field = Init->getMember(); 2132 RecordDecl *Parent = Field->getParent(); 2133 if (!Parent->isAnonymousStructOrUnion()) 2134 return false; 2135 2136 NamedDecl *Child = Field; 2137 do { 2138 if (Parent->isUnion()) { 2139 UnionEntry &En = Unions[Parent]; 2140 if (En.first && En.first != Child) { 2141 S.Diag(Init->getSourceLocation(), 2142 diag::err_multiple_mem_union_initialization) 2143 << Field->getDeclName() 2144 << Init->getSourceRange(); 2145 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2146 << 0 << En.second->getSourceRange(); 2147 return true; 2148 } else if (!En.first) { 2149 En.first = Child; 2150 En.second = Init; 2151 } 2152 } 2153 2154 Child = Parent; 2155 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2156 } while (Parent->isAnonymousStructOrUnion()); 2157 2158 return false; 2159} 2160} 2161 2162/// ActOnMemInitializers - Handle the member initializers for a constructor. 2163void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2164 SourceLocation ColonLoc, 2165 MemInitTy **meminits, unsigned NumMemInits, 2166 bool AnyErrors) { 2167 if (!ConstructorDecl) 2168 return; 2169 2170 AdjustDeclIfTemplate(ConstructorDecl); 2171 2172 CXXConstructorDecl *Constructor 2173 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2174 2175 if (!Constructor) { 2176 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2177 return; 2178 } 2179 2180 CXXBaseOrMemberInitializer **MemInits = 2181 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2182 2183 // Mapping for the duplicate initializers check. 2184 // For member initializers, this is keyed with a FieldDecl*. 2185 // For base initializers, this is keyed with a Type*. 2186 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2187 2188 // Mapping for the inconsistent anonymous-union initializers check. 2189 RedundantUnionMap MemberUnions; 2190 2191 bool HadError = false; 2192 for (unsigned i = 0; i < NumMemInits; i++) { 2193 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2194 2195 // Set the source order index. 2196 Init->setSourceOrder(i); 2197 2198 if (Init->isMemberInitializer()) { 2199 FieldDecl *Field = Init->getMember(); 2200 if (CheckRedundantInit(*this, Init, Members[Field]) || 2201 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2202 HadError = true; 2203 } else { 2204 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2205 if (CheckRedundantInit(*this, Init, Members[Key])) 2206 HadError = true; 2207 } 2208 } 2209 2210 if (HadError) 2211 return; 2212 2213 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2214 2215 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2216} 2217 2218void 2219Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2220 CXXRecordDecl *ClassDecl) { 2221 // Ignore dependent contexts. 2222 if (ClassDecl->isDependentContext()) 2223 return; 2224 2225 // FIXME: all the access-control diagnostics are positioned on the 2226 // field/base declaration. That's probably good; that said, the 2227 // user might reasonably want to know why the destructor is being 2228 // emitted, and we currently don't say. 2229 2230 // Non-static data members. 2231 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2232 E = ClassDecl->field_end(); I != E; ++I) { 2233 FieldDecl *Field = *I; 2234 if (Field->isInvalidDecl()) 2235 continue; 2236 QualType FieldType = Context.getBaseElementType(Field->getType()); 2237 2238 const RecordType* RT = FieldType->getAs<RecordType>(); 2239 if (!RT) 2240 continue; 2241 2242 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2243 if (FieldClassDecl->hasTrivialDestructor()) 2244 continue; 2245 2246 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2247 CheckDestructorAccess(Field->getLocation(), Dtor, 2248 PDiag(diag::err_access_dtor_field) 2249 << Field->getDeclName() 2250 << FieldType); 2251 2252 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2253 } 2254 2255 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2256 2257 // Bases. 2258 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2259 E = ClassDecl->bases_end(); Base != E; ++Base) { 2260 // Bases are always records in a well-formed non-dependent class. 2261 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2262 2263 // Remember direct virtual bases. 2264 if (Base->isVirtual()) 2265 DirectVirtualBases.insert(RT); 2266 2267 // Ignore trivial destructors. 2268 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2269 if (BaseClassDecl->hasTrivialDestructor()) 2270 continue; 2271 2272 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2273 2274 // FIXME: caret should be on the start of the class name 2275 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2276 PDiag(diag::err_access_dtor_base) 2277 << Base->getType() 2278 << Base->getSourceRange()); 2279 2280 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2281 } 2282 2283 // Virtual bases. 2284 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2285 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2286 2287 // Bases are always records in a well-formed non-dependent class. 2288 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2289 2290 // Ignore direct virtual bases. 2291 if (DirectVirtualBases.count(RT)) 2292 continue; 2293 2294 // Ignore trivial destructors. 2295 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2296 if (BaseClassDecl->hasTrivialDestructor()) 2297 continue; 2298 2299 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2300 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2301 PDiag(diag::err_access_dtor_vbase) 2302 << VBase->getType()); 2303 2304 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2305 } 2306} 2307 2308void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2309 if (!CDtorDecl) 2310 return; 2311 2312 if (CXXConstructorDecl *Constructor 2313 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2314 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2315} 2316 2317bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2318 unsigned DiagID, AbstractDiagSelID SelID) { 2319 if (SelID == -1) 2320 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2321 else 2322 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2323} 2324 2325bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2326 const PartialDiagnostic &PD) { 2327 if (!getLangOptions().CPlusPlus) 2328 return false; 2329 2330 if (const ArrayType *AT = Context.getAsArrayType(T)) 2331 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2332 2333 if (const PointerType *PT = T->getAs<PointerType>()) { 2334 // Find the innermost pointer type. 2335 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2336 PT = T; 2337 2338 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2339 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2340 } 2341 2342 const RecordType *RT = T->getAs<RecordType>(); 2343 if (!RT) 2344 return false; 2345 2346 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2347 2348 // We can't answer whether something is abstract until it has a 2349 // definition. If it's currently being defined, we'll walk back 2350 // over all the declarations when we have a full definition. 2351 const CXXRecordDecl *Def = RD->getDefinition(); 2352 if (!Def || Def->isBeingDefined()) 2353 return false; 2354 2355 if (!RD->isAbstract()) 2356 return false; 2357 2358 Diag(Loc, PD) << RD->getDeclName(); 2359 DiagnoseAbstractType(RD); 2360 2361 return true; 2362} 2363 2364void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2365 // Check if we've already emitted the list of pure virtual functions 2366 // for this class. 2367 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2368 return; 2369 2370 CXXFinalOverriderMap FinalOverriders; 2371 RD->getFinalOverriders(FinalOverriders); 2372 2373 // Keep a set of seen pure methods so we won't diagnose the same method 2374 // more than once. 2375 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2376 2377 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2378 MEnd = FinalOverriders.end(); 2379 M != MEnd; 2380 ++M) { 2381 for (OverridingMethods::iterator SO = M->second.begin(), 2382 SOEnd = M->second.end(); 2383 SO != SOEnd; ++SO) { 2384 // C++ [class.abstract]p4: 2385 // A class is abstract if it contains or inherits at least one 2386 // pure virtual function for which the final overrider is pure 2387 // virtual. 2388 2389 // 2390 if (SO->second.size() != 1) 2391 continue; 2392 2393 if (!SO->second.front().Method->isPure()) 2394 continue; 2395 2396 if (!SeenPureMethods.insert(SO->second.front().Method)) 2397 continue; 2398 2399 Diag(SO->second.front().Method->getLocation(), 2400 diag::note_pure_virtual_function) 2401 << SO->second.front().Method->getDeclName(); 2402 } 2403 } 2404 2405 if (!PureVirtualClassDiagSet) 2406 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2407 PureVirtualClassDiagSet->insert(RD); 2408} 2409 2410namespace { 2411struct AbstractUsageInfo { 2412 Sema &S; 2413 CXXRecordDecl *Record; 2414 CanQualType AbstractType; 2415 bool Invalid; 2416 2417 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2418 : S(S), Record(Record), 2419 AbstractType(S.Context.getCanonicalType( 2420 S.Context.getTypeDeclType(Record))), 2421 Invalid(false) {} 2422 2423 void DiagnoseAbstractType() { 2424 if (Invalid) return; 2425 S.DiagnoseAbstractType(Record); 2426 Invalid = true; 2427 } 2428 2429 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2430}; 2431 2432struct CheckAbstractUsage { 2433 AbstractUsageInfo &Info; 2434 const NamedDecl *Ctx; 2435 2436 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2437 : Info(Info), Ctx(Ctx) {} 2438 2439 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2440 switch (TL.getTypeLocClass()) { 2441#define ABSTRACT_TYPELOC(CLASS, PARENT) 2442#define TYPELOC(CLASS, PARENT) \ 2443 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2444#include "clang/AST/TypeLocNodes.def" 2445 } 2446 } 2447 2448 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2449 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2450 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2451 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2452 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2453 } 2454 } 2455 2456 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2457 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2458 } 2459 2460 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2461 // Visit the type parameters from a permissive context. 2462 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2463 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2464 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2465 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2466 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2467 // TODO: other template argument types? 2468 } 2469 } 2470 2471 // Visit pointee types from a permissive context. 2472#define CheckPolymorphic(Type) \ 2473 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2474 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2475 } 2476 CheckPolymorphic(PointerTypeLoc) 2477 CheckPolymorphic(ReferenceTypeLoc) 2478 CheckPolymorphic(MemberPointerTypeLoc) 2479 CheckPolymorphic(BlockPointerTypeLoc) 2480 2481 /// Handle all the types we haven't given a more specific 2482 /// implementation for above. 2483 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2484 // Every other kind of type that we haven't called out already 2485 // that has an inner type is either (1) sugar or (2) contains that 2486 // inner type in some way as a subobject. 2487 if (TypeLoc Next = TL.getNextTypeLoc()) 2488 return Visit(Next, Sel); 2489 2490 // If there's no inner type and we're in a permissive context, 2491 // don't diagnose. 2492 if (Sel == Sema::AbstractNone) return; 2493 2494 // Check whether the type matches the abstract type. 2495 QualType T = TL.getType(); 2496 if (T->isArrayType()) { 2497 Sel = Sema::AbstractArrayType; 2498 T = Info.S.Context.getBaseElementType(T); 2499 } 2500 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2501 if (CT != Info.AbstractType) return; 2502 2503 // It matched; do some magic. 2504 if (Sel == Sema::AbstractArrayType) { 2505 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2506 << T << TL.getSourceRange(); 2507 } else { 2508 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2509 << Sel << T << TL.getSourceRange(); 2510 } 2511 Info.DiagnoseAbstractType(); 2512 } 2513}; 2514 2515void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2516 Sema::AbstractDiagSelID Sel) { 2517 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2518} 2519 2520} 2521 2522/// Check for invalid uses of an abstract type in a method declaration. 2523static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2524 CXXMethodDecl *MD) { 2525 // No need to do the check on definitions, which require that 2526 // the return/param types be complete. 2527 if (MD->isThisDeclarationADefinition()) 2528 return; 2529 2530 // For safety's sake, just ignore it if we don't have type source 2531 // information. This should never happen for non-implicit methods, 2532 // but... 2533 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2534 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2535} 2536 2537/// Check for invalid uses of an abstract type within a class definition. 2538static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2539 CXXRecordDecl *RD) { 2540 for (CXXRecordDecl::decl_iterator 2541 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2542 Decl *D = *I; 2543 if (D->isImplicit()) continue; 2544 2545 // Methods and method templates. 2546 if (isa<CXXMethodDecl>(D)) { 2547 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2548 } else if (isa<FunctionTemplateDecl>(D)) { 2549 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2550 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2551 2552 // Fields and static variables. 2553 } else if (isa<FieldDecl>(D)) { 2554 FieldDecl *FD = cast<FieldDecl>(D); 2555 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2556 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2557 } else if (isa<VarDecl>(D)) { 2558 VarDecl *VD = cast<VarDecl>(D); 2559 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2560 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2561 2562 // Nested classes and class templates. 2563 } else if (isa<CXXRecordDecl>(D)) { 2564 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2565 } else if (isa<ClassTemplateDecl>(D)) { 2566 CheckAbstractClassUsage(Info, 2567 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2568 } 2569 } 2570} 2571 2572/// \brief Perform semantic checks on a class definition that has been 2573/// completing, introducing implicitly-declared members, checking for 2574/// abstract types, etc. 2575void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2576 if (!Record || Record->isInvalidDecl()) 2577 return; 2578 2579 if (!Record->isDependentType()) 2580 AddImplicitlyDeclaredMembersToClass(Record); 2581 2582 if (Record->isInvalidDecl()) 2583 return; 2584 2585 // Set access bits correctly on the directly-declared conversions. 2586 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2587 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2588 Convs->setAccess(I, (*I)->getAccess()); 2589 2590 // Determine whether we need to check for final overriders. We do 2591 // this either when there are virtual base classes (in which case we 2592 // may end up finding multiple final overriders for a given virtual 2593 // function) or any of the base classes is abstract (in which case 2594 // we might detect that this class is abstract). 2595 bool CheckFinalOverriders = false; 2596 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2597 !Record->isDependentType()) { 2598 if (Record->getNumVBases()) 2599 CheckFinalOverriders = true; 2600 else if (!Record->isAbstract()) { 2601 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2602 BEnd = Record->bases_end(); 2603 B != BEnd; ++B) { 2604 CXXRecordDecl *BaseDecl 2605 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2606 if (BaseDecl->isAbstract()) { 2607 CheckFinalOverriders = true; 2608 break; 2609 } 2610 } 2611 } 2612 } 2613 2614 if (CheckFinalOverriders) { 2615 CXXFinalOverriderMap FinalOverriders; 2616 Record->getFinalOverriders(FinalOverriders); 2617 2618 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2619 MEnd = FinalOverriders.end(); 2620 M != MEnd; ++M) { 2621 for (OverridingMethods::iterator SO = M->second.begin(), 2622 SOEnd = M->second.end(); 2623 SO != SOEnd; ++SO) { 2624 assert(SO->second.size() > 0 && 2625 "All virtual functions have overridding virtual functions"); 2626 if (SO->second.size() == 1) { 2627 // C++ [class.abstract]p4: 2628 // A class is abstract if it contains or inherits at least one 2629 // pure virtual function for which the final overrider is pure 2630 // virtual. 2631 if (SO->second.front().Method->isPure()) 2632 Record->setAbstract(true); 2633 continue; 2634 } 2635 2636 // C++ [class.virtual]p2: 2637 // In a derived class, if a virtual member function of a base 2638 // class subobject has more than one final overrider the 2639 // program is ill-formed. 2640 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2641 << (NamedDecl *)M->first << Record; 2642 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2643 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2644 OMEnd = SO->second.end(); 2645 OM != OMEnd; ++OM) 2646 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2647 << (NamedDecl *)M->first << OM->Method->getParent(); 2648 2649 Record->setInvalidDecl(); 2650 } 2651 } 2652 } 2653 2654 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2655 AbstractUsageInfo Info(*this, Record); 2656 CheckAbstractClassUsage(Info, Record); 2657 } 2658 2659 // If this is not an aggregate type and has no user-declared constructor, 2660 // complain about any non-static data members of reference or const scalar 2661 // type, since they will never get initializers. 2662 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2663 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2664 bool Complained = false; 2665 for (RecordDecl::field_iterator F = Record->field_begin(), 2666 FEnd = Record->field_end(); 2667 F != FEnd; ++F) { 2668 if (F->getType()->isReferenceType() || 2669 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2670 if (!Complained) { 2671 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2672 << Record->getTagKind() << Record; 2673 Complained = true; 2674 } 2675 2676 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2677 << F->getType()->isReferenceType() 2678 << F->getDeclName(); 2679 } 2680 } 2681 } 2682 2683 if (Record->isDynamicClass()) 2684 DynamicClasses.push_back(Record); 2685} 2686 2687void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2688 Decl *TagDecl, 2689 SourceLocation LBrac, 2690 SourceLocation RBrac, 2691 AttributeList *AttrList) { 2692 if (!TagDecl) 2693 return; 2694 2695 AdjustDeclIfTemplate(TagDecl); 2696 2697 ActOnFields(S, RLoc, TagDecl, 2698 // strict aliasing violation! 2699 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2700 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2701 2702 CheckCompletedCXXClass( 2703 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2704} 2705 2706namespace { 2707 /// \brief Helper class that collects exception specifications for 2708 /// implicitly-declared special member functions. 2709 class ImplicitExceptionSpecification { 2710 ASTContext &Context; 2711 bool AllowsAllExceptions; 2712 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2713 llvm::SmallVector<QualType, 4> Exceptions; 2714 2715 public: 2716 explicit ImplicitExceptionSpecification(ASTContext &Context) 2717 : Context(Context), AllowsAllExceptions(false) { } 2718 2719 /// \brief Whether the special member function should have any 2720 /// exception specification at all. 2721 bool hasExceptionSpecification() const { 2722 return !AllowsAllExceptions; 2723 } 2724 2725 /// \brief Whether the special member function should have a 2726 /// throw(...) exception specification (a Microsoft extension). 2727 bool hasAnyExceptionSpecification() const { 2728 return false; 2729 } 2730 2731 /// \brief The number of exceptions in the exception specification. 2732 unsigned size() const { return Exceptions.size(); } 2733 2734 /// \brief The set of exceptions in the exception specification. 2735 const QualType *data() const { return Exceptions.data(); } 2736 2737 /// \brief Note that 2738 void CalledDecl(CXXMethodDecl *Method) { 2739 // If we already know that we allow all exceptions, do nothing. 2740 if (AllowsAllExceptions || !Method) 2741 return; 2742 2743 const FunctionProtoType *Proto 2744 = Method->getType()->getAs<FunctionProtoType>(); 2745 2746 // If this function can throw any exceptions, make a note of that. 2747 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2748 AllowsAllExceptions = true; 2749 ExceptionsSeen.clear(); 2750 Exceptions.clear(); 2751 return; 2752 } 2753 2754 // Record the exceptions in this function's exception specification. 2755 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2756 EEnd = Proto->exception_end(); 2757 E != EEnd; ++E) 2758 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2759 Exceptions.push_back(*E); 2760 } 2761 }; 2762} 2763 2764 2765/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2766/// special functions, such as the default constructor, copy 2767/// constructor, or destructor, to the given C++ class (C++ 2768/// [special]p1). This routine can only be executed just before the 2769/// definition of the class is complete. 2770void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2771 if (!ClassDecl->hasUserDeclaredConstructor()) 2772 ++ASTContext::NumImplicitDefaultConstructors; 2773 2774 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2775 ++ASTContext::NumImplicitCopyConstructors; 2776 2777 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2778 ++ASTContext::NumImplicitCopyAssignmentOperators; 2779 2780 // If we have a dynamic class, then the copy assignment operator may be 2781 // virtual, so we have to declare it immediately. This ensures that, e.g., 2782 // it shows up in the right place in the vtable and that we diagnose 2783 // problems with the implicit exception specification. 2784 if (ClassDecl->isDynamicClass()) 2785 DeclareImplicitCopyAssignment(ClassDecl); 2786 } 2787 2788 if (!ClassDecl->hasUserDeclaredDestructor()) { 2789 ++ASTContext::NumImplicitDestructors; 2790 2791 // If we have a dynamic class, then the destructor may be virtual, so we 2792 // have to declare the destructor immediately. This ensures that, e.g., it 2793 // shows up in the right place in the vtable and that we diagnose problems 2794 // with the implicit exception specification. 2795 if (ClassDecl->isDynamicClass()) 2796 DeclareImplicitDestructor(ClassDecl); 2797 } 2798} 2799 2800void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2801 if (!D) 2802 return; 2803 2804 TemplateParameterList *Params = 0; 2805 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2806 Params = Template->getTemplateParameters(); 2807 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2808 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2809 Params = PartialSpec->getTemplateParameters(); 2810 else 2811 return; 2812 2813 for (TemplateParameterList::iterator Param = Params->begin(), 2814 ParamEnd = Params->end(); 2815 Param != ParamEnd; ++Param) { 2816 NamedDecl *Named = cast<NamedDecl>(*Param); 2817 if (Named->getDeclName()) { 2818 S->AddDecl(Named); 2819 IdResolver.AddDecl(Named); 2820 } 2821 } 2822} 2823 2824void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2825 if (!RecordD) return; 2826 AdjustDeclIfTemplate(RecordD); 2827 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2828 PushDeclContext(S, Record); 2829} 2830 2831void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2832 if (!RecordD) return; 2833 PopDeclContext(); 2834} 2835 2836/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2837/// parsing a top-level (non-nested) C++ class, and we are now 2838/// parsing those parts of the given Method declaration that could 2839/// not be parsed earlier (C++ [class.mem]p2), such as default 2840/// arguments. This action should enter the scope of the given 2841/// Method declaration as if we had just parsed the qualified method 2842/// name. However, it should not bring the parameters into scope; 2843/// that will be performed by ActOnDelayedCXXMethodParameter. 2844void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2845} 2846 2847/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2848/// C++ method declaration. We're (re-)introducing the given 2849/// function parameter into scope for use in parsing later parts of 2850/// the method declaration. For example, we could see an 2851/// ActOnParamDefaultArgument event for this parameter. 2852void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2853 if (!ParamD) 2854 return; 2855 2856 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2857 2858 // If this parameter has an unparsed default argument, clear it out 2859 // to make way for the parsed default argument. 2860 if (Param->hasUnparsedDefaultArg()) 2861 Param->setDefaultArg(0); 2862 2863 S->AddDecl(Param); 2864 if (Param->getDeclName()) 2865 IdResolver.AddDecl(Param); 2866} 2867 2868/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2869/// processing the delayed method declaration for Method. The method 2870/// declaration is now considered finished. There may be a separate 2871/// ActOnStartOfFunctionDef action later (not necessarily 2872/// immediately!) for this method, if it was also defined inside the 2873/// class body. 2874void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2875 if (!MethodD) 2876 return; 2877 2878 AdjustDeclIfTemplate(MethodD); 2879 2880 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2881 2882 // Now that we have our default arguments, check the constructor 2883 // again. It could produce additional diagnostics or affect whether 2884 // the class has implicitly-declared destructors, among other 2885 // things. 2886 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2887 CheckConstructor(Constructor); 2888 2889 // Check the default arguments, which we may have added. 2890 if (!Method->isInvalidDecl()) 2891 CheckCXXDefaultArguments(Method); 2892} 2893 2894/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2895/// the well-formedness of the constructor declarator @p D with type @p 2896/// R. If there are any errors in the declarator, this routine will 2897/// emit diagnostics and set the invalid bit to true. In any case, the type 2898/// will be updated to reflect a well-formed type for the constructor and 2899/// returned. 2900QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2901 StorageClass &SC) { 2902 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2903 2904 // C++ [class.ctor]p3: 2905 // A constructor shall not be virtual (10.3) or static (9.4). A 2906 // constructor can be invoked for a const, volatile or const 2907 // volatile object. A constructor shall not be declared const, 2908 // volatile, or const volatile (9.3.2). 2909 if (isVirtual) { 2910 if (!D.isInvalidType()) 2911 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2912 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2913 << SourceRange(D.getIdentifierLoc()); 2914 D.setInvalidType(); 2915 } 2916 if (SC == SC_Static) { 2917 if (!D.isInvalidType()) 2918 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2919 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2920 << SourceRange(D.getIdentifierLoc()); 2921 D.setInvalidType(); 2922 SC = SC_None; 2923 } 2924 2925 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2926 if (FTI.TypeQuals != 0) { 2927 if (FTI.TypeQuals & Qualifiers::Const) 2928 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2929 << "const" << SourceRange(D.getIdentifierLoc()); 2930 if (FTI.TypeQuals & Qualifiers::Volatile) 2931 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2932 << "volatile" << SourceRange(D.getIdentifierLoc()); 2933 if (FTI.TypeQuals & Qualifiers::Restrict) 2934 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2935 << "restrict" << SourceRange(D.getIdentifierLoc()); 2936 } 2937 2938 // Rebuild the function type "R" without any type qualifiers (in 2939 // case any of the errors above fired) and with "void" as the 2940 // return type, since constructors don't have return types. 2941 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2942 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2943 Proto->getNumArgs(), 2944 Proto->isVariadic(), 0, 2945 Proto->hasExceptionSpec(), 2946 Proto->hasAnyExceptionSpec(), 2947 Proto->getNumExceptions(), 2948 Proto->exception_begin(), 2949 Proto->getExtInfo()); 2950} 2951 2952/// CheckConstructor - Checks a fully-formed constructor for 2953/// well-formedness, issuing any diagnostics required. Returns true if 2954/// the constructor declarator is invalid. 2955void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2956 CXXRecordDecl *ClassDecl 2957 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2958 if (!ClassDecl) 2959 return Constructor->setInvalidDecl(); 2960 2961 // C++ [class.copy]p3: 2962 // A declaration of a constructor for a class X is ill-formed if 2963 // its first parameter is of type (optionally cv-qualified) X and 2964 // either there are no other parameters or else all other 2965 // parameters have default arguments. 2966 if (!Constructor->isInvalidDecl() && 2967 ((Constructor->getNumParams() == 1) || 2968 (Constructor->getNumParams() > 1 && 2969 Constructor->getParamDecl(1)->hasDefaultArg())) && 2970 Constructor->getTemplateSpecializationKind() 2971 != TSK_ImplicitInstantiation) { 2972 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2973 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2974 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2975 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2976 const char *ConstRef 2977 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2978 : " const &"; 2979 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2980 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2981 2982 // FIXME: Rather that making the constructor invalid, we should endeavor 2983 // to fix the type. 2984 Constructor->setInvalidDecl(); 2985 } 2986 } 2987 2988 // Notify the class that we've added a constructor. In principle we 2989 // don't need to do this for out-of-line declarations; in practice 2990 // we only instantiate the most recent declaration of a method, so 2991 // we have to call this for everything but friends. 2992 if (!Constructor->getFriendObjectKind()) 2993 ClassDecl->addedConstructor(Context, Constructor); 2994} 2995 2996/// CheckDestructor - Checks a fully-formed destructor definition for 2997/// well-formedness, issuing any diagnostics required. Returns true 2998/// on error. 2999bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3000 CXXRecordDecl *RD = Destructor->getParent(); 3001 3002 if (Destructor->isVirtual()) { 3003 SourceLocation Loc; 3004 3005 if (!Destructor->isImplicit()) 3006 Loc = Destructor->getLocation(); 3007 else 3008 Loc = RD->getLocation(); 3009 3010 // If we have a virtual destructor, look up the deallocation function 3011 FunctionDecl *OperatorDelete = 0; 3012 DeclarationName Name = 3013 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3014 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3015 return true; 3016 3017 MarkDeclarationReferenced(Loc, OperatorDelete); 3018 3019 Destructor->setOperatorDelete(OperatorDelete); 3020 } 3021 3022 return false; 3023} 3024 3025static inline bool 3026FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3027 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3028 FTI.ArgInfo[0].Param && 3029 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3030} 3031 3032/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3033/// the well-formednes of the destructor declarator @p D with type @p 3034/// R. If there are any errors in the declarator, this routine will 3035/// emit diagnostics and set the declarator to invalid. Even if this happens, 3036/// will be updated to reflect a well-formed type for the destructor and 3037/// returned. 3038QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3039 StorageClass& SC) { 3040 // C++ [class.dtor]p1: 3041 // [...] A typedef-name that names a class is a class-name 3042 // (7.1.3); however, a typedef-name that names a class shall not 3043 // be used as the identifier in the declarator for a destructor 3044 // declaration. 3045 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3046 if (isa<TypedefType>(DeclaratorType)) 3047 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3048 << DeclaratorType; 3049 3050 // C++ [class.dtor]p2: 3051 // A destructor is used to destroy objects of its class type. A 3052 // destructor takes no parameters, and no return type can be 3053 // specified for it (not even void). The address of a destructor 3054 // shall not be taken. A destructor shall not be static. A 3055 // destructor can be invoked for a const, volatile or const 3056 // volatile object. A destructor shall not be declared const, 3057 // volatile or const volatile (9.3.2). 3058 if (SC == SC_Static) { 3059 if (!D.isInvalidType()) 3060 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3061 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3062 << SourceRange(D.getIdentifierLoc()) 3063 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3064 3065 SC = SC_None; 3066 } 3067 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3068 // Destructors don't have return types, but the parser will 3069 // happily parse something like: 3070 // 3071 // class X { 3072 // float ~X(); 3073 // }; 3074 // 3075 // The return type will be eliminated later. 3076 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3077 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3078 << SourceRange(D.getIdentifierLoc()); 3079 } 3080 3081 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3082 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3083 if (FTI.TypeQuals & Qualifiers::Const) 3084 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3085 << "const" << SourceRange(D.getIdentifierLoc()); 3086 if (FTI.TypeQuals & Qualifiers::Volatile) 3087 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3088 << "volatile" << SourceRange(D.getIdentifierLoc()); 3089 if (FTI.TypeQuals & Qualifiers::Restrict) 3090 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3091 << "restrict" << SourceRange(D.getIdentifierLoc()); 3092 D.setInvalidType(); 3093 } 3094 3095 // Make sure we don't have any parameters. 3096 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3097 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3098 3099 // Delete the parameters. 3100 FTI.freeArgs(); 3101 D.setInvalidType(); 3102 } 3103 3104 // Make sure the destructor isn't variadic. 3105 if (FTI.isVariadic) { 3106 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3107 D.setInvalidType(); 3108 } 3109 3110 // Rebuild the function type "R" without any type qualifiers or 3111 // parameters (in case any of the errors above fired) and with 3112 // "void" as the return type, since destructors don't have return 3113 // types. 3114 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3115 if (!Proto) 3116 return QualType(); 3117 3118 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3119 Proto->hasExceptionSpec(), 3120 Proto->hasAnyExceptionSpec(), 3121 Proto->getNumExceptions(), 3122 Proto->exception_begin(), 3123 Proto->getExtInfo()); 3124} 3125 3126/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3127/// well-formednes of the conversion function declarator @p D with 3128/// type @p R. If there are any errors in the declarator, this routine 3129/// will emit diagnostics and return true. Otherwise, it will return 3130/// false. Either way, the type @p R will be updated to reflect a 3131/// well-formed type for the conversion operator. 3132void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3133 StorageClass& SC) { 3134 // C++ [class.conv.fct]p1: 3135 // Neither parameter types nor return type can be specified. The 3136 // type of a conversion function (8.3.5) is "function taking no 3137 // parameter returning conversion-type-id." 3138 if (SC == SC_Static) { 3139 if (!D.isInvalidType()) 3140 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3141 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3142 << SourceRange(D.getIdentifierLoc()); 3143 D.setInvalidType(); 3144 SC = SC_None; 3145 } 3146 3147 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3148 3149 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3150 // Conversion functions don't have return types, but the parser will 3151 // happily parse something like: 3152 // 3153 // class X { 3154 // float operator bool(); 3155 // }; 3156 // 3157 // The return type will be changed later anyway. 3158 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3159 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3160 << SourceRange(D.getIdentifierLoc()); 3161 D.setInvalidType(); 3162 } 3163 3164 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3165 3166 // Make sure we don't have any parameters. 3167 if (Proto->getNumArgs() > 0) { 3168 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3169 3170 // Delete the parameters. 3171 D.getTypeObject(0).Fun.freeArgs(); 3172 D.setInvalidType(); 3173 } else if (Proto->isVariadic()) { 3174 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3175 D.setInvalidType(); 3176 } 3177 3178 // Diagnose "&operator bool()" and other such nonsense. This 3179 // is actually a gcc extension which we don't support. 3180 if (Proto->getResultType() != ConvType) { 3181 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3182 << Proto->getResultType(); 3183 D.setInvalidType(); 3184 ConvType = Proto->getResultType(); 3185 } 3186 3187 // C++ [class.conv.fct]p4: 3188 // The conversion-type-id shall not represent a function type nor 3189 // an array type. 3190 if (ConvType->isArrayType()) { 3191 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3192 ConvType = Context.getPointerType(ConvType); 3193 D.setInvalidType(); 3194 } else if (ConvType->isFunctionType()) { 3195 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3196 ConvType = Context.getPointerType(ConvType); 3197 D.setInvalidType(); 3198 } 3199 3200 // Rebuild the function type "R" without any parameters (in case any 3201 // of the errors above fired) and with the conversion type as the 3202 // return type. 3203 if (D.isInvalidType()) { 3204 R = Context.getFunctionType(ConvType, 0, 0, false, 3205 Proto->getTypeQuals(), 3206 Proto->hasExceptionSpec(), 3207 Proto->hasAnyExceptionSpec(), 3208 Proto->getNumExceptions(), 3209 Proto->exception_begin(), 3210 Proto->getExtInfo()); 3211 } 3212 3213 // C++0x explicit conversion operators. 3214 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3215 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3216 diag::warn_explicit_conversion_functions) 3217 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3218} 3219 3220/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3221/// the declaration of the given C++ conversion function. This routine 3222/// is responsible for recording the conversion function in the C++ 3223/// class, if possible. 3224Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3225 assert(Conversion && "Expected to receive a conversion function declaration"); 3226 3227 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3228 3229 // Make sure we aren't redeclaring the conversion function. 3230 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3231 3232 // C++ [class.conv.fct]p1: 3233 // [...] A conversion function is never used to convert a 3234 // (possibly cv-qualified) object to the (possibly cv-qualified) 3235 // same object type (or a reference to it), to a (possibly 3236 // cv-qualified) base class of that type (or a reference to it), 3237 // or to (possibly cv-qualified) void. 3238 // FIXME: Suppress this warning if the conversion function ends up being a 3239 // virtual function that overrides a virtual function in a base class. 3240 QualType ClassType 3241 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3242 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3243 ConvType = ConvTypeRef->getPointeeType(); 3244 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3245 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3246 /* Suppress diagnostics for instantiations. */; 3247 else if (ConvType->isRecordType()) { 3248 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3249 if (ConvType == ClassType) 3250 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3251 << ClassType; 3252 else if (IsDerivedFrom(ClassType, ConvType)) 3253 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3254 << ClassType << ConvType; 3255 } else if (ConvType->isVoidType()) { 3256 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3257 << ClassType << ConvType; 3258 } 3259 3260 if (Conversion->getPrimaryTemplate()) { 3261 // ignore specializations 3262 } else if (Conversion->getPreviousDeclaration()) { 3263 if (FunctionTemplateDecl *ConversionTemplate 3264 = Conversion->getDescribedFunctionTemplate()) { 3265 if (ClassDecl->replaceConversion( 3266 ConversionTemplate->getPreviousDeclaration(), 3267 ConversionTemplate)) 3268 return ConversionTemplate; 3269 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3270 Conversion)) 3271 return Conversion; 3272 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3273 } else if (FunctionTemplateDecl *ConversionTemplate 3274 = Conversion->getDescribedFunctionTemplate()) 3275 ClassDecl->addConversionFunction(ConversionTemplate); 3276 else 3277 ClassDecl->addConversionFunction(Conversion); 3278 3279 return Conversion; 3280} 3281 3282//===----------------------------------------------------------------------===// 3283// Namespace Handling 3284//===----------------------------------------------------------------------===// 3285 3286 3287 3288/// ActOnStartNamespaceDef - This is called at the start of a namespace 3289/// definition. 3290Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3291 SourceLocation InlineLoc, 3292 SourceLocation IdentLoc, 3293 IdentifierInfo *II, 3294 SourceLocation LBrace, 3295 AttributeList *AttrList) { 3296 // anonymous namespace starts at its left brace 3297 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3298 (II ? IdentLoc : LBrace) , II); 3299 Namespc->setLBracLoc(LBrace); 3300 Namespc->setInline(InlineLoc.isValid()); 3301 3302 Scope *DeclRegionScope = NamespcScope->getParent(); 3303 3304 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3305 3306 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3307 PushVisibilityAttr(attr); 3308 3309 if (II) { 3310 // C++ [namespace.def]p2: 3311 // The identifier in an original-namespace-definition shall not have been 3312 // previously defined in the declarative region in which the 3313 // original-namespace-definition appears. The identifier in an 3314 // original-namespace-definition is the name of the namespace. Subsequently 3315 // in that declarative region, it is treated as an original-namespace-name. 3316 3317 NamedDecl *PrevDecl 3318 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3319 ForRedeclaration); 3320 3321 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3322 // This is an extended namespace definition. 3323 if (Namespc->isInline() != OrigNS->isInline()) { 3324 // inline-ness must match 3325 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3326 << Namespc->isInline(); 3327 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3328 Namespc->setInvalidDecl(); 3329 // Recover by ignoring the new namespace's inline status. 3330 Namespc->setInline(OrigNS->isInline()); 3331 } 3332 3333 // Attach this namespace decl to the chain of extended namespace 3334 // definitions. 3335 OrigNS->setNextNamespace(Namespc); 3336 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3337 3338 // Remove the previous declaration from the scope. 3339 if (DeclRegionScope->isDeclScope(OrigNS)) { 3340 IdResolver.RemoveDecl(OrigNS); 3341 DeclRegionScope->RemoveDecl(OrigNS); 3342 } 3343 } else if (PrevDecl) { 3344 // This is an invalid name redefinition. 3345 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3346 << Namespc->getDeclName(); 3347 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3348 Namespc->setInvalidDecl(); 3349 // Continue on to push Namespc as current DeclContext and return it. 3350 } else if (II->isStr("std") && 3351 CurContext->getRedeclContext()->isTranslationUnit()) { 3352 // This is the first "real" definition of the namespace "std", so update 3353 // our cache of the "std" namespace to point at this definition. 3354 if (NamespaceDecl *StdNS = getStdNamespace()) { 3355 // We had already defined a dummy namespace "std". Link this new 3356 // namespace definition to the dummy namespace "std". 3357 StdNS->setNextNamespace(Namespc); 3358 StdNS->setLocation(IdentLoc); 3359 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3360 } 3361 3362 // Make our StdNamespace cache point at the first real definition of the 3363 // "std" namespace. 3364 StdNamespace = Namespc; 3365 } 3366 3367 PushOnScopeChains(Namespc, DeclRegionScope); 3368 } else { 3369 // Anonymous namespaces. 3370 assert(Namespc->isAnonymousNamespace()); 3371 3372 // Link the anonymous namespace into its parent. 3373 NamespaceDecl *PrevDecl; 3374 DeclContext *Parent = CurContext->getRedeclContext(); 3375 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3376 PrevDecl = TU->getAnonymousNamespace(); 3377 TU->setAnonymousNamespace(Namespc); 3378 } else { 3379 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3380 PrevDecl = ND->getAnonymousNamespace(); 3381 ND->setAnonymousNamespace(Namespc); 3382 } 3383 3384 // Link the anonymous namespace with its previous declaration. 3385 if (PrevDecl) { 3386 assert(PrevDecl->isAnonymousNamespace()); 3387 assert(!PrevDecl->getNextNamespace()); 3388 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3389 PrevDecl->setNextNamespace(Namespc); 3390 3391 if (Namespc->isInline() != PrevDecl->isInline()) { 3392 // inline-ness must match 3393 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3394 << Namespc->isInline(); 3395 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3396 Namespc->setInvalidDecl(); 3397 // Recover by ignoring the new namespace's inline status. 3398 Namespc->setInline(PrevDecl->isInline()); 3399 } 3400 } 3401 3402 CurContext->addDecl(Namespc); 3403 3404 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3405 // behaves as if it were replaced by 3406 // namespace unique { /* empty body */ } 3407 // using namespace unique; 3408 // namespace unique { namespace-body } 3409 // where all occurrences of 'unique' in a translation unit are 3410 // replaced by the same identifier and this identifier differs 3411 // from all other identifiers in the entire program. 3412 3413 // We just create the namespace with an empty name and then add an 3414 // implicit using declaration, just like the standard suggests. 3415 // 3416 // CodeGen enforces the "universally unique" aspect by giving all 3417 // declarations semantically contained within an anonymous 3418 // namespace internal linkage. 3419 3420 if (!PrevDecl) { 3421 UsingDirectiveDecl* UD 3422 = UsingDirectiveDecl::Create(Context, CurContext, 3423 /* 'using' */ LBrace, 3424 /* 'namespace' */ SourceLocation(), 3425 /* qualifier */ SourceRange(), 3426 /* NNS */ NULL, 3427 /* identifier */ SourceLocation(), 3428 Namespc, 3429 /* Ancestor */ CurContext); 3430 UD->setImplicit(); 3431 CurContext->addDecl(UD); 3432 } 3433 } 3434 3435 // Although we could have an invalid decl (i.e. the namespace name is a 3436 // redefinition), push it as current DeclContext and try to continue parsing. 3437 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3438 // for the namespace has the declarations that showed up in that particular 3439 // namespace definition. 3440 PushDeclContext(NamespcScope, Namespc); 3441 return Namespc; 3442} 3443 3444/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3445/// is a namespace alias, returns the namespace it points to. 3446static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3447 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3448 return AD->getNamespace(); 3449 return dyn_cast_or_null<NamespaceDecl>(D); 3450} 3451 3452/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3453/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3454void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3455 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3456 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3457 Namespc->setRBracLoc(RBrace); 3458 PopDeclContext(); 3459 if (Namespc->hasAttr<VisibilityAttr>()) 3460 PopPragmaVisibility(); 3461} 3462 3463CXXRecordDecl *Sema::getStdBadAlloc() const { 3464 return cast_or_null<CXXRecordDecl>( 3465 StdBadAlloc.get(Context.getExternalSource())); 3466} 3467 3468NamespaceDecl *Sema::getStdNamespace() const { 3469 return cast_or_null<NamespaceDecl>( 3470 StdNamespace.get(Context.getExternalSource())); 3471} 3472 3473/// \brief Retrieve the special "std" namespace, which may require us to 3474/// implicitly define the namespace. 3475NamespaceDecl *Sema::getOrCreateStdNamespace() { 3476 if (!StdNamespace) { 3477 // The "std" namespace has not yet been defined, so build one implicitly. 3478 StdNamespace = NamespaceDecl::Create(Context, 3479 Context.getTranslationUnitDecl(), 3480 SourceLocation(), 3481 &PP.getIdentifierTable().get("std")); 3482 getStdNamespace()->setImplicit(true); 3483 } 3484 3485 return getStdNamespace(); 3486} 3487 3488Decl *Sema::ActOnUsingDirective(Scope *S, 3489 SourceLocation UsingLoc, 3490 SourceLocation NamespcLoc, 3491 CXXScopeSpec &SS, 3492 SourceLocation IdentLoc, 3493 IdentifierInfo *NamespcName, 3494 AttributeList *AttrList) { 3495 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3496 assert(NamespcName && "Invalid NamespcName."); 3497 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3498 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3499 3500 UsingDirectiveDecl *UDir = 0; 3501 NestedNameSpecifier *Qualifier = 0; 3502 if (SS.isSet()) 3503 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3504 3505 // Lookup namespace name. 3506 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3507 LookupParsedName(R, S, &SS); 3508 if (R.isAmbiguous()) 3509 return 0; 3510 3511 if (R.empty()) { 3512 // Allow "using namespace std;" or "using namespace ::std;" even if 3513 // "std" hasn't been defined yet, for GCC compatibility. 3514 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3515 NamespcName->isStr("std")) { 3516 Diag(IdentLoc, diag::ext_using_undefined_std); 3517 R.addDecl(getOrCreateStdNamespace()); 3518 R.resolveKind(); 3519 } 3520 // Otherwise, attempt typo correction. 3521 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3522 CTC_NoKeywords, 0)) { 3523 if (R.getAsSingle<NamespaceDecl>() || 3524 R.getAsSingle<NamespaceAliasDecl>()) { 3525 if (DeclContext *DC = computeDeclContext(SS, false)) 3526 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3527 << NamespcName << DC << Corrected << SS.getRange() 3528 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3529 else 3530 Diag(IdentLoc, diag::err_using_directive_suggest) 3531 << NamespcName << Corrected 3532 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3533 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3534 << Corrected; 3535 3536 NamespcName = Corrected.getAsIdentifierInfo(); 3537 } else { 3538 R.clear(); 3539 R.setLookupName(NamespcName); 3540 } 3541 } 3542 } 3543 3544 if (!R.empty()) { 3545 NamedDecl *Named = R.getFoundDecl(); 3546 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3547 && "expected namespace decl"); 3548 // C++ [namespace.udir]p1: 3549 // A using-directive specifies that the names in the nominated 3550 // namespace can be used in the scope in which the 3551 // using-directive appears after the using-directive. During 3552 // unqualified name lookup (3.4.1), the names appear as if they 3553 // were declared in the nearest enclosing namespace which 3554 // contains both the using-directive and the nominated 3555 // namespace. [Note: in this context, "contains" means "contains 3556 // directly or indirectly". ] 3557 3558 // Find enclosing context containing both using-directive and 3559 // nominated namespace. 3560 NamespaceDecl *NS = getNamespaceDecl(Named); 3561 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3562 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3563 CommonAncestor = CommonAncestor->getParent(); 3564 3565 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3566 SS.getRange(), 3567 (NestedNameSpecifier *)SS.getScopeRep(), 3568 IdentLoc, Named, CommonAncestor); 3569 PushUsingDirective(S, UDir); 3570 } else { 3571 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3572 } 3573 3574 // FIXME: We ignore attributes for now. 3575 delete AttrList; 3576 return UDir; 3577} 3578 3579void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3580 // If scope has associated entity, then using directive is at namespace 3581 // or translation unit scope. We add UsingDirectiveDecls, into 3582 // it's lookup structure. 3583 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3584 Ctx->addDecl(UDir); 3585 else 3586 // Otherwise it is block-sope. using-directives will affect lookup 3587 // only to the end of scope. 3588 S->PushUsingDirective(UDir); 3589} 3590 3591 3592Decl *Sema::ActOnUsingDeclaration(Scope *S, 3593 AccessSpecifier AS, 3594 bool HasUsingKeyword, 3595 SourceLocation UsingLoc, 3596 CXXScopeSpec &SS, 3597 UnqualifiedId &Name, 3598 AttributeList *AttrList, 3599 bool IsTypeName, 3600 SourceLocation TypenameLoc) { 3601 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3602 3603 switch (Name.getKind()) { 3604 case UnqualifiedId::IK_Identifier: 3605 case UnqualifiedId::IK_OperatorFunctionId: 3606 case UnqualifiedId::IK_LiteralOperatorId: 3607 case UnqualifiedId::IK_ConversionFunctionId: 3608 break; 3609 3610 case UnqualifiedId::IK_ConstructorName: 3611 case UnqualifiedId::IK_ConstructorTemplateId: 3612 // C++0x inherited constructors. 3613 if (getLangOptions().CPlusPlus0x) break; 3614 3615 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3616 << SS.getRange(); 3617 return 0; 3618 3619 case UnqualifiedId::IK_DestructorName: 3620 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3621 << SS.getRange(); 3622 return 0; 3623 3624 case UnqualifiedId::IK_TemplateId: 3625 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3626 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3627 return 0; 3628 } 3629 3630 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3631 DeclarationName TargetName = TargetNameInfo.getName(); 3632 if (!TargetName) 3633 return 0; 3634 3635 // Warn about using declarations. 3636 // TODO: store that the declaration was written without 'using' and 3637 // talk about access decls instead of using decls in the 3638 // diagnostics. 3639 if (!HasUsingKeyword) { 3640 UsingLoc = Name.getSourceRange().getBegin(); 3641 3642 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3643 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3644 } 3645 3646 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3647 TargetNameInfo, AttrList, 3648 /* IsInstantiation */ false, 3649 IsTypeName, TypenameLoc); 3650 if (UD) 3651 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3652 3653 return UD; 3654} 3655 3656/// \brief Determine whether a using declaration considers the given 3657/// declarations as "equivalent", e.g., if they are redeclarations of 3658/// the same entity or are both typedefs of the same type. 3659static bool 3660IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3661 bool &SuppressRedeclaration) { 3662 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3663 SuppressRedeclaration = false; 3664 return true; 3665 } 3666 3667 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3668 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3669 SuppressRedeclaration = true; 3670 return Context.hasSameType(TD1->getUnderlyingType(), 3671 TD2->getUnderlyingType()); 3672 } 3673 3674 return false; 3675} 3676 3677 3678/// Determines whether to create a using shadow decl for a particular 3679/// decl, given the set of decls existing prior to this using lookup. 3680bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3681 const LookupResult &Previous) { 3682 // Diagnose finding a decl which is not from a base class of the 3683 // current class. We do this now because there are cases where this 3684 // function will silently decide not to build a shadow decl, which 3685 // will pre-empt further diagnostics. 3686 // 3687 // We don't need to do this in C++0x because we do the check once on 3688 // the qualifier. 3689 // 3690 // FIXME: diagnose the following if we care enough: 3691 // struct A { int foo; }; 3692 // struct B : A { using A::foo; }; 3693 // template <class T> struct C : A {}; 3694 // template <class T> struct D : C<T> { using B::foo; } // <--- 3695 // This is invalid (during instantiation) in C++03 because B::foo 3696 // resolves to the using decl in B, which is not a base class of D<T>. 3697 // We can't diagnose it immediately because C<T> is an unknown 3698 // specialization. The UsingShadowDecl in D<T> then points directly 3699 // to A::foo, which will look well-formed when we instantiate. 3700 // The right solution is to not collapse the shadow-decl chain. 3701 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3702 DeclContext *OrigDC = Orig->getDeclContext(); 3703 3704 // Handle enums and anonymous structs. 3705 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3706 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3707 while (OrigRec->isAnonymousStructOrUnion()) 3708 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3709 3710 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3711 if (OrigDC == CurContext) { 3712 Diag(Using->getLocation(), 3713 diag::err_using_decl_nested_name_specifier_is_current_class) 3714 << Using->getNestedNameRange(); 3715 Diag(Orig->getLocation(), diag::note_using_decl_target); 3716 return true; 3717 } 3718 3719 Diag(Using->getNestedNameRange().getBegin(), 3720 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3721 << Using->getTargetNestedNameDecl() 3722 << cast<CXXRecordDecl>(CurContext) 3723 << Using->getNestedNameRange(); 3724 Diag(Orig->getLocation(), diag::note_using_decl_target); 3725 return true; 3726 } 3727 } 3728 3729 if (Previous.empty()) return false; 3730 3731 NamedDecl *Target = Orig; 3732 if (isa<UsingShadowDecl>(Target)) 3733 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3734 3735 // If the target happens to be one of the previous declarations, we 3736 // don't have a conflict. 3737 // 3738 // FIXME: but we might be increasing its access, in which case we 3739 // should redeclare it. 3740 NamedDecl *NonTag = 0, *Tag = 0; 3741 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3742 I != E; ++I) { 3743 NamedDecl *D = (*I)->getUnderlyingDecl(); 3744 bool Result; 3745 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3746 return Result; 3747 3748 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3749 } 3750 3751 if (Target->isFunctionOrFunctionTemplate()) { 3752 FunctionDecl *FD; 3753 if (isa<FunctionTemplateDecl>(Target)) 3754 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3755 else 3756 FD = cast<FunctionDecl>(Target); 3757 3758 NamedDecl *OldDecl = 0; 3759 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3760 case Ovl_Overload: 3761 return false; 3762 3763 case Ovl_NonFunction: 3764 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3765 break; 3766 3767 // We found a decl with the exact signature. 3768 case Ovl_Match: 3769 // If we're in a record, we want to hide the target, so we 3770 // return true (without a diagnostic) to tell the caller not to 3771 // build a shadow decl. 3772 if (CurContext->isRecord()) 3773 return true; 3774 3775 // If we're not in a record, this is an error. 3776 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3777 break; 3778 } 3779 3780 Diag(Target->getLocation(), diag::note_using_decl_target); 3781 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3782 return true; 3783 } 3784 3785 // Target is not a function. 3786 3787 if (isa<TagDecl>(Target)) { 3788 // No conflict between a tag and a non-tag. 3789 if (!Tag) return false; 3790 3791 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3792 Diag(Target->getLocation(), diag::note_using_decl_target); 3793 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3794 return true; 3795 } 3796 3797 // No conflict between a tag and a non-tag. 3798 if (!NonTag) return false; 3799 3800 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3801 Diag(Target->getLocation(), diag::note_using_decl_target); 3802 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3803 return true; 3804} 3805 3806/// Builds a shadow declaration corresponding to a 'using' declaration. 3807UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3808 UsingDecl *UD, 3809 NamedDecl *Orig) { 3810 3811 // If we resolved to another shadow declaration, just coalesce them. 3812 NamedDecl *Target = Orig; 3813 if (isa<UsingShadowDecl>(Target)) { 3814 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3815 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3816 } 3817 3818 UsingShadowDecl *Shadow 3819 = UsingShadowDecl::Create(Context, CurContext, 3820 UD->getLocation(), UD, Target); 3821 UD->addShadowDecl(Shadow); 3822 3823 if (S) 3824 PushOnScopeChains(Shadow, S); 3825 else 3826 CurContext->addDecl(Shadow); 3827 Shadow->setAccess(UD->getAccess()); 3828 3829 // Register it as a conversion if appropriate. 3830 if (Shadow->getDeclName().getNameKind() 3831 == DeclarationName::CXXConversionFunctionName) 3832 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3833 3834 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3835 Shadow->setInvalidDecl(); 3836 3837 return Shadow; 3838} 3839 3840/// Hides a using shadow declaration. This is required by the current 3841/// using-decl implementation when a resolvable using declaration in a 3842/// class is followed by a declaration which would hide or override 3843/// one or more of the using decl's targets; for example: 3844/// 3845/// struct Base { void foo(int); }; 3846/// struct Derived : Base { 3847/// using Base::foo; 3848/// void foo(int); 3849/// }; 3850/// 3851/// The governing language is C++03 [namespace.udecl]p12: 3852/// 3853/// When a using-declaration brings names from a base class into a 3854/// derived class scope, member functions in the derived class 3855/// override and/or hide member functions with the same name and 3856/// parameter types in a base class (rather than conflicting). 3857/// 3858/// There are two ways to implement this: 3859/// (1) optimistically create shadow decls when they're not hidden 3860/// by existing declarations, or 3861/// (2) don't create any shadow decls (or at least don't make them 3862/// visible) until we've fully parsed/instantiated the class. 3863/// The problem with (1) is that we might have to retroactively remove 3864/// a shadow decl, which requires several O(n) operations because the 3865/// decl structures are (very reasonably) not designed for removal. 3866/// (2) avoids this but is very fiddly and phase-dependent. 3867void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3868 if (Shadow->getDeclName().getNameKind() == 3869 DeclarationName::CXXConversionFunctionName) 3870 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3871 3872 // Remove it from the DeclContext... 3873 Shadow->getDeclContext()->removeDecl(Shadow); 3874 3875 // ...and the scope, if applicable... 3876 if (S) { 3877 S->RemoveDecl(Shadow); 3878 IdResolver.RemoveDecl(Shadow); 3879 } 3880 3881 // ...and the using decl. 3882 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3883 3884 // TODO: complain somehow if Shadow was used. It shouldn't 3885 // be possible for this to happen, because...? 3886} 3887 3888/// Builds a using declaration. 3889/// 3890/// \param IsInstantiation - Whether this call arises from an 3891/// instantiation of an unresolved using declaration. We treat 3892/// the lookup differently for these declarations. 3893NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3894 SourceLocation UsingLoc, 3895 CXXScopeSpec &SS, 3896 const DeclarationNameInfo &NameInfo, 3897 AttributeList *AttrList, 3898 bool IsInstantiation, 3899 bool IsTypeName, 3900 SourceLocation TypenameLoc) { 3901 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3902 SourceLocation IdentLoc = NameInfo.getLoc(); 3903 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3904 3905 // FIXME: We ignore attributes for now. 3906 delete AttrList; 3907 3908 if (SS.isEmpty()) { 3909 Diag(IdentLoc, diag::err_using_requires_qualname); 3910 return 0; 3911 } 3912 3913 // Do the redeclaration lookup in the current scope. 3914 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3915 ForRedeclaration); 3916 Previous.setHideTags(false); 3917 if (S) { 3918 LookupName(Previous, S); 3919 3920 // It is really dumb that we have to do this. 3921 LookupResult::Filter F = Previous.makeFilter(); 3922 while (F.hasNext()) { 3923 NamedDecl *D = F.next(); 3924 if (!isDeclInScope(D, CurContext, S)) 3925 F.erase(); 3926 } 3927 F.done(); 3928 } else { 3929 assert(IsInstantiation && "no scope in non-instantiation"); 3930 assert(CurContext->isRecord() && "scope not record in instantiation"); 3931 LookupQualifiedName(Previous, CurContext); 3932 } 3933 3934 NestedNameSpecifier *NNS = 3935 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3936 3937 // Check for invalid redeclarations. 3938 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3939 return 0; 3940 3941 // Check for bad qualifiers. 3942 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3943 return 0; 3944 3945 DeclContext *LookupContext = computeDeclContext(SS); 3946 NamedDecl *D; 3947 if (!LookupContext) { 3948 if (IsTypeName) { 3949 // FIXME: not all declaration name kinds are legal here 3950 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3951 UsingLoc, TypenameLoc, 3952 SS.getRange(), NNS, 3953 IdentLoc, NameInfo.getName()); 3954 } else { 3955 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3956 UsingLoc, SS.getRange(), 3957 NNS, NameInfo); 3958 } 3959 } else { 3960 D = UsingDecl::Create(Context, CurContext, 3961 SS.getRange(), UsingLoc, NNS, NameInfo, 3962 IsTypeName); 3963 } 3964 D->setAccess(AS); 3965 CurContext->addDecl(D); 3966 3967 if (!LookupContext) return D; 3968 UsingDecl *UD = cast<UsingDecl>(D); 3969 3970 if (RequireCompleteDeclContext(SS, LookupContext)) { 3971 UD->setInvalidDecl(); 3972 return UD; 3973 } 3974 3975 // Look up the target name. 3976 3977 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3978 3979 // Unlike most lookups, we don't always want to hide tag 3980 // declarations: tag names are visible through the using declaration 3981 // even if hidden by ordinary names, *except* in a dependent context 3982 // where it's important for the sanity of two-phase lookup. 3983 if (!IsInstantiation) 3984 R.setHideTags(false); 3985 3986 LookupQualifiedName(R, LookupContext); 3987 3988 if (R.empty()) { 3989 Diag(IdentLoc, diag::err_no_member) 3990 << NameInfo.getName() << LookupContext << SS.getRange(); 3991 UD->setInvalidDecl(); 3992 return UD; 3993 } 3994 3995 if (R.isAmbiguous()) { 3996 UD->setInvalidDecl(); 3997 return UD; 3998 } 3999 4000 if (IsTypeName) { 4001 // If we asked for a typename and got a non-type decl, error out. 4002 if (!R.getAsSingle<TypeDecl>()) { 4003 Diag(IdentLoc, diag::err_using_typename_non_type); 4004 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4005 Diag((*I)->getUnderlyingDecl()->getLocation(), 4006 diag::note_using_decl_target); 4007 UD->setInvalidDecl(); 4008 return UD; 4009 } 4010 } else { 4011 // If we asked for a non-typename and we got a type, error out, 4012 // but only if this is an instantiation of an unresolved using 4013 // decl. Otherwise just silently find the type name. 4014 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4015 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4016 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4017 UD->setInvalidDecl(); 4018 return UD; 4019 } 4020 } 4021 4022 // C++0x N2914 [namespace.udecl]p6: 4023 // A using-declaration shall not name a namespace. 4024 if (R.getAsSingle<NamespaceDecl>()) { 4025 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4026 << SS.getRange(); 4027 UD->setInvalidDecl(); 4028 return UD; 4029 } 4030 4031 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4032 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4033 BuildUsingShadowDecl(S, UD, *I); 4034 } 4035 4036 return UD; 4037} 4038 4039/// Checks that the given using declaration is not an invalid 4040/// redeclaration. Note that this is checking only for the using decl 4041/// itself, not for any ill-formedness among the UsingShadowDecls. 4042bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4043 bool isTypeName, 4044 const CXXScopeSpec &SS, 4045 SourceLocation NameLoc, 4046 const LookupResult &Prev) { 4047 // C++03 [namespace.udecl]p8: 4048 // C++0x [namespace.udecl]p10: 4049 // A using-declaration is a declaration and can therefore be used 4050 // repeatedly where (and only where) multiple declarations are 4051 // allowed. 4052 // 4053 // That's in non-member contexts. 4054 if (!CurContext->getRedeclContext()->isRecord()) 4055 return false; 4056 4057 NestedNameSpecifier *Qual 4058 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4059 4060 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4061 NamedDecl *D = *I; 4062 4063 bool DTypename; 4064 NestedNameSpecifier *DQual; 4065 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4066 DTypename = UD->isTypeName(); 4067 DQual = UD->getTargetNestedNameDecl(); 4068 } else if (UnresolvedUsingValueDecl *UD 4069 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4070 DTypename = false; 4071 DQual = UD->getTargetNestedNameSpecifier(); 4072 } else if (UnresolvedUsingTypenameDecl *UD 4073 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4074 DTypename = true; 4075 DQual = UD->getTargetNestedNameSpecifier(); 4076 } else continue; 4077 4078 // using decls differ if one says 'typename' and the other doesn't. 4079 // FIXME: non-dependent using decls? 4080 if (isTypeName != DTypename) continue; 4081 4082 // using decls differ if they name different scopes (but note that 4083 // template instantiation can cause this check to trigger when it 4084 // didn't before instantiation). 4085 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4086 Context.getCanonicalNestedNameSpecifier(DQual)) 4087 continue; 4088 4089 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4090 Diag(D->getLocation(), diag::note_using_decl) << 1; 4091 return true; 4092 } 4093 4094 return false; 4095} 4096 4097 4098/// Checks that the given nested-name qualifier used in a using decl 4099/// in the current context is appropriately related to the current 4100/// scope. If an error is found, diagnoses it and returns true. 4101bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4102 const CXXScopeSpec &SS, 4103 SourceLocation NameLoc) { 4104 DeclContext *NamedContext = computeDeclContext(SS); 4105 4106 if (!CurContext->isRecord()) { 4107 // C++03 [namespace.udecl]p3: 4108 // C++0x [namespace.udecl]p8: 4109 // A using-declaration for a class member shall be a member-declaration. 4110 4111 // If we weren't able to compute a valid scope, it must be a 4112 // dependent class scope. 4113 if (!NamedContext || NamedContext->isRecord()) { 4114 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4115 << SS.getRange(); 4116 return true; 4117 } 4118 4119 // Otherwise, everything is known to be fine. 4120 return false; 4121 } 4122 4123 // The current scope is a record. 4124 4125 // If the named context is dependent, we can't decide much. 4126 if (!NamedContext) { 4127 // FIXME: in C++0x, we can diagnose if we can prove that the 4128 // nested-name-specifier does not refer to a base class, which is 4129 // still possible in some cases. 4130 4131 // Otherwise we have to conservatively report that things might be 4132 // okay. 4133 return false; 4134 } 4135 4136 if (!NamedContext->isRecord()) { 4137 // Ideally this would point at the last name in the specifier, 4138 // but we don't have that level of source info. 4139 Diag(SS.getRange().getBegin(), 4140 diag::err_using_decl_nested_name_specifier_is_not_class) 4141 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4142 return true; 4143 } 4144 4145 if (getLangOptions().CPlusPlus0x) { 4146 // C++0x [namespace.udecl]p3: 4147 // In a using-declaration used as a member-declaration, the 4148 // nested-name-specifier shall name a base class of the class 4149 // being defined. 4150 4151 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4152 cast<CXXRecordDecl>(NamedContext))) { 4153 if (CurContext == NamedContext) { 4154 Diag(NameLoc, 4155 diag::err_using_decl_nested_name_specifier_is_current_class) 4156 << SS.getRange(); 4157 return true; 4158 } 4159 4160 Diag(SS.getRange().getBegin(), 4161 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4162 << (NestedNameSpecifier*) SS.getScopeRep() 4163 << cast<CXXRecordDecl>(CurContext) 4164 << SS.getRange(); 4165 return true; 4166 } 4167 4168 return false; 4169 } 4170 4171 // C++03 [namespace.udecl]p4: 4172 // A using-declaration used as a member-declaration shall refer 4173 // to a member of a base class of the class being defined [etc.]. 4174 4175 // Salient point: SS doesn't have to name a base class as long as 4176 // lookup only finds members from base classes. Therefore we can 4177 // diagnose here only if we can prove that that can't happen, 4178 // i.e. if the class hierarchies provably don't intersect. 4179 4180 // TODO: it would be nice if "definitely valid" results were cached 4181 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4182 // need to be repeated. 4183 4184 struct UserData { 4185 llvm::DenseSet<const CXXRecordDecl*> Bases; 4186 4187 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4188 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4189 Data->Bases.insert(Base); 4190 return true; 4191 } 4192 4193 bool hasDependentBases(const CXXRecordDecl *Class) { 4194 return !Class->forallBases(collect, this); 4195 } 4196 4197 /// Returns true if the base is dependent or is one of the 4198 /// accumulated base classes. 4199 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4200 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4201 return !Data->Bases.count(Base); 4202 } 4203 4204 bool mightShareBases(const CXXRecordDecl *Class) { 4205 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4206 } 4207 }; 4208 4209 UserData Data; 4210 4211 // Returns false if we find a dependent base. 4212 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4213 return false; 4214 4215 // Returns false if the class has a dependent base or if it or one 4216 // of its bases is present in the base set of the current context. 4217 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4218 return false; 4219 4220 Diag(SS.getRange().getBegin(), 4221 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4222 << (NestedNameSpecifier*) SS.getScopeRep() 4223 << cast<CXXRecordDecl>(CurContext) 4224 << SS.getRange(); 4225 4226 return true; 4227} 4228 4229Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4230 SourceLocation NamespaceLoc, 4231 SourceLocation AliasLoc, 4232 IdentifierInfo *Alias, 4233 CXXScopeSpec &SS, 4234 SourceLocation IdentLoc, 4235 IdentifierInfo *Ident) { 4236 4237 // Lookup the namespace name. 4238 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4239 LookupParsedName(R, S, &SS); 4240 4241 // Check if we have a previous declaration with the same name. 4242 NamedDecl *PrevDecl 4243 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4244 ForRedeclaration); 4245 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4246 PrevDecl = 0; 4247 4248 if (PrevDecl) { 4249 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4250 // We already have an alias with the same name that points to the same 4251 // namespace, so don't create a new one. 4252 // FIXME: At some point, we'll want to create the (redundant) 4253 // declaration to maintain better source information. 4254 if (!R.isAmbiguous() && !R.empty() && 4255 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4256 return 0; 4257 } 4258 4259 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4260 diag::err_redefinition_different_kind; 4261 Diag(AliasLoc, DiagID) << Alias; 4262 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4263 return 0; 4264 } 4265 4266 if (R.isAmbiguous()) 4267 return 0; 4268 4269 if (R.empty()) { 4270 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4271 CTC_NoKeywords, 0)) { 4272 if (R.getAsSingle<NamespaceDecl>() || 4273 R.getAsSingle<NamespaceAliasDecl>()) { 4274 if (DeclContext *DC = computeDeclContext(SS, false)) 4275 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4276 << Ident << DC << Corrected << SS.getRange() 4277 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4278 else 4279 Diag(IdentLoc, diag::err_using_directive_suggest) 4280 << Ident << Corrected 4281 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4282 4283 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4284 << Corrected; 4285 4286 Ident = Corrected.getAsIdentifierInfo(); 4287 } else { 4288 R.clear(); 4289 R.setLookupName(Ident); 4290 } 4291 } 4292 4293 if (R.empty()) { 4294 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4295 return 0; 4296 } 4297 } 4298 4299 NamespaceAliasDecl *AliasDecl = 4300 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4301 Alias, SS.getRange(), 4302 (NestedNameSpecifier *)SS.getScopeRep(), 4303 IdentLoc, R.getFoundDecl()); 4304 4305 PushOnScopeChains(AliasDecl, S); 4306 return AliasDecl; 4307} 4308 4309namespace { 4310 /// \brief Scoped object used to handle the state changes required in Sema 4311 /// to implicitly define the body of a C++ member function; 4312 class ImplicitlyDefinedFunctionScope { 4313 Sema &S; 4314 DeclContext *PreviousContext; 4315 4316 public: 4317 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4318 : S(S), PreviousContext(S.CurContext) 4319 { 4320 S.CurContext = Method; 4321 S.PushFunctionScope(); 4322 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4323 } 4324 4325 ~ImplicitlyDefinedFunctionScope() { 4326 S.PopExpressionEvaluationContext(); 4327 S.PopFunctionOrBlockScope(); 4328 S.CurContext = PreviousContext; 4329 } 4330 }; 4331} 4332 4333static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4334 CXXRecordDecl *D) { 4335 ASTContext &Context = Self.Context; 4336 QualType ClassType = Context.getTypeDeclType(D); 4337 DeclarationName ConstructorName 4338 = Context.DeclarationNames.getCXXConstructorName( 4339 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4340 4341 DeclContext::lookup_const_iterator Con, ConEnd; 4342 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4343 Con != ConEnd; ++Con) { 4344 // FIXME: In C++0x, a constructor template can be a default constructor. 4345 if (isa<FunctionTemplateDecl>(*Con)) 4346 continue; 4347 4348 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4349 if (Constructor->isDefaultConstructor()) 4350 return Constructor; 4351 } 4352 return 0; 4353} 4354 4355CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4356 CXXRecordDecl *ClassDecl) { 4357 // C++ [class.ctor]p5: 4358 // A default constructor for a class X is a constructor of class X 4359 // that can be called without an argument. If there is no 4360 // user-declared constructor for class X, a default constructor is 4361 // implicitly declared. An implicitly-declared default constructor 4362 // is an inline public member of its class. 4363 assert(!ClassDecl->hasUserDeclaredConstructor() && 4364 "Should not build implicit default constructor!"); 4365 4366 // C++ [except.spec]p14: 4367 // An implicitly declared special member function (Clause 12) shall have an 4368 // exception-specification. [...] 4369 ImplicitExceptionSpecification ExceptSpec(Context); 4370 4371 // Direct base-class destructors. 4372 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4373 BEnd = ClassDecl->bases_end(); 4374 B != BEnd; ++B) { 4375 if (B->isVirtual()) // Handled below. 4376 continue; 4377 4378 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4379 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4380 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4381 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4382 else if (CXXConstructorDecl *Constructor 4383 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4384 ExceptSpec.CalledDecl(Constructor); 4385 } 4386 } 4387 4388 // Virtual base-class destructors. 4389 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4390 BEnd = ClassDecl->vbases_end(); 4391 B != BEnd; ++B) { 4392 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4393 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4394 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4395 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4396 else if (CXXConstructorDecl *Constructor 4397 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4398 ExceptSpec.CalledDecl(Constructor); 4399 } 4400 } 4401 4402 // Field destructors. 4403 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4404 FEnd = ClassDecl->field_end(); 4405 F != FEnd; ++F) { 4406 if (const RecordType *RecordTy 4407 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4408 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4409 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4410 ExceptSpec.CalledDecl( 4411 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4412 else if (CXXConstructorDecl *Constructor 4413 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4414 ExceptSpec.CalledDecl(Constructor); 4415 } 4416 } 4417 4418 4419 // Create the actual constructor declaration. 4420 CanQualType ClassType 4421 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4422 DeclarationName Name 4423 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4424 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4425 CXXConstructorDecl *DefaultCon 4426 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4427 Context.getFunctionType(Context.VoidTy, 4428 0, 0, false, 0, 4429 ExceptSpec.hasExceptionSpecification(), 4430 ExceptSpec.hasAnyExceptionSpecification(), 4431 ExceptSpec.size(), 4432 ExceptSpec.data(), 4433 FunctionType::ExtInfo()), 4434 /*TInfo=*/0, 4435 /*isExplicit=*/false, 4436 /*isInline=*/true, 4437 /*isImplicitlyDeclared=*/true); 4438 DefaultCon->setAccess(AS_public); 4439 DefaultCon->setImplicit(); 4440 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4441 4442 // Note that we have declared this constructor. 4443 ClassDecl->setDeclaredDefaultConstructor(true); 4444 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4445 4446 if (Scope *S = getScopeForContext(ClassDecl)) 4447 PushOnScopeChains(DefaultCon, S, false); 4448 ClassDecl->addDecl(DefaultCon); 4449 4450 return DefaultCon; 4451} 4452 4453void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4454 CXXConstructorDecl *Constructor) { 4455 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4456 !Constructor->isUsed(false)) && 4457 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4458 4459 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4460 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4461 4462 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4463 ErrorTrap Trap(*this); 4464 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4465 Trap.hasErrorOccurred()) { 4466 Diag(CurrentLocation, diag::note_member_synthesized_at) 4467 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4468 Constructor->setInvalidDecl(); 4469 return; 4470 } 4471 4472 SourceLocation Loc = Constructor->getLocation(); 4473 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4474 4475 Constructor->setUsed(); 4476 MarkVTableUsed(CurrentLocation, ClassDecl); 4477} 4478 4479CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4480 // C++ [class.dtor]p2: 4481 // If a class has no user-declared destructor, a destructor is 4482 // declared implicitly. An implicitly-declared destructor is an 4483 // inline public member of its class. 4484 4485 // C++ [except.spec]p14: 4486 // An implicitly declared special member function (Clause 12) shall have 4487 // an exception-specification. 4488 ImplicitExceptionSpecification ExceptSpec(Context); 4489 4490 // Direct base-class destructors. 4491 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4492 BEnd = ClassDecl->bases_end(); 4493 B != BEnd; ++B) { 4494 if (B->isVirtual()) // Handled below. 4495 continue; 4496 4497 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4498 ExceptSpec.CalledDecl( 4499 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4500 } 4501 4502 // Virtual base-class destructors. 4503 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4504 BEnd = ClassDecl->vbases_end(); 4505 B != BEnd; ++B) { 4506 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4507 ExceptSpec.CalledDecl( 4508 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4509 } 4510 4511 // Field destructors. 4512 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4513 FEnd = ClassDecl->field_end(); 4514 F != FEnd; ++F) { 4515 if (const RecordType *RecordTy 4516 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4517 ExceptSpec.CalledDecl( 4518 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4519 } 4520 4521 // Create the actual destructor declaration. 4522 QualType Ty = Context.getFunctionType(Context.VoidTy, 4523 0, 0, false, 0, 4524 ExceptSpec.hasExceptionSpecification(), 4525 ExceptSpec.hasAnyExceptionSpecification(), 4526 ExceptSpec.size(), 4527 ExceptSpec.data(), 4528 FunctionType::ExtInfo()); 4529 4530 CanQualType ClassType 4531 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4532 DeclarationName Name 4533 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4534 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4535 CXXDestructorDecl *Destructor 4536 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4537 /*isInline=*/true, 4538 /*isImplicitlyDeclared=*/true); 4539 Destructor->setAccess(AS_public); 4540 Destructor->setImplicit(); 4541 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4542 4543 // Note that we have declared this destructor. 4544 ClassDecl->setDeclaredDestructor(true); 4545 ++ASTContext::NumImplicitDestructorsDeclared; 4546 4547 // Introduce this destructor into its scope. 4548 if (Scope *S = getScopeForContext(ClassDecl)) 4549 PushOnScopeChains(Destructor, S, false); 4550 ClassDecl->addDecl(Destructor); 4551 4552 // This could be uniqued if it ever proves significant. 4553 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4554 4555 AddOverriddenMethods(ClassDecl, Destructor); 4556 4557 return Destructor; 4558} 4559 4560void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4561 CXXDestructorDecl *Destructor) { 4562 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4563 "DefineImplicitDestructor - call it for implicit default dtor"); 4564 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4565 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4566 4567 if (Destructor->isInvalidDecl()) 4568 return; 4569 4570 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4571 4572 ErrorTrap Trap(*this); 4573 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4574 Destructor->getParent()); 4575 4576 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4577 Diag(CurrentLocation, diag::note_member_synthesized_at) 4578 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4579 4580 Destructor->setInvalidDecl(); 4581 return; 4582 } 4583 4584 SourceLocation Loc = Destructor->getLocation(); 4585 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4586 4587 Destructor->setUsed(); 4588 MarkVTableUsed(CurrentLocation, ClassDecl); 4589} 4590 4591/// \brief Builds a statement that copies the given entity from \p From to 4592/// \c To. 4593/// 4594/// This routine is used to copy the members of a class with an 4595/// implicitly-declared copy assignment operator. When the entities being 4596/// copied are arrays, this routine builds for loops to copy them. 4597/// 4598/// \param S The Sema object used for type-checking. 4599/// 4600/// \param Loc The location where the implicit copy is being generated. 4601/// 4602/// \param T The type of the expressions being copied. Both expressions must 4603/// have this type. 4604/// 4605/// \param To The expression we are copying to. 4606/// 4607/// \param From The expression we are copying from. 4608/// 4609/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4610/// Otherwise, it's a non-static member subobject. 4611/// 4612/// \param Depth Internal parameter recording the depth of the recursion. 4613/// 4614/// \returns A statement or a loop that copies the expressions. 4615static StmtResult 4616BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4617 Expr *To, Expr *From, 4618 bool CopyingBaseSubobject, unsigned Depth = 0) { 4619 // C++0x [class.copy]p30: 4620 // Each subobject is assigned in the manner appropriate to its type: 4621 // 4622 // - if the subobject is of class type, the copy assignment operator 4623 // for the class is used (as if by explicit qualification; that is, 4624 // ignoring any possible virtual overriding functions in more derived 4625 // classes); 4626 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4627 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4628 4629 // Look for operator=. 4630 DeclarationName Name 4631 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4632 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4633 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4634 4635 // Filter out any result that isn't a copy-assignment operator. 4636 LookupResult::Filter F = OpLookup.makeFilter(); 4637 while (F.hasNext()) { 4638 NamedDecl *D = F.next(); 4639 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4640 if (Method->isCopyAssignmentOperator()) 4641 continue; 4642 4643 F.erase(); 4644 } 4645 F.done(); 4646 4647 // Suppress the protected check (C++ [class.protected]) for each of the 4648 // assignment operators we found. This strange dance is required when 4649 // we're assigning via a base classes's copy-assignment operator. To 4650 // ensure that we're getting the right base class subobject (without 4651 // ambiguities), we need to cast "this" to that subobject type; to 4652 // ensure that we don't go through the virtual call mechanism, we need 4653 // to qualify the operator= name with the base class (see below). However, 4654 // this means that if the base class has a protected copy assignment 4655 // operator, the protected member access check will fail. So, we 4656 // rewrite "protected" access to "public" access in this case, since we 4657 // know by construction that we're calling from a derived class. 4658 if (CopyingBaseSubobject) { 4659 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4660 L != LEnd; ++L) { 4661 if (L.getAccess() == AS_protected) 4662 L.setAccess(AS_public); 4663 } 4664 } 4665 4666 // Create the nested-name-specifier that will be used to qualify the 4667 // reference to operator=; this is required to suppress the virtual 4668 // call mechanism. 4669 CXXScopeSpec SS; 4670 SS.setRange(Loc); 4671 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4672 T.getTypePtr())); 4673 4674 // Create the reference to operator=. 4675 ExprResult OpEqualRef 4676 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4677 /*FirstQualifierInScope=*/0, OpLookup, 4678 /*TemplateArgs=*/0, 4679 /*SuppressQualifierCheck=*/true); 4680 if (OpEqualRef.isInvalid()) 4681 return StmtError(); 4682 4683 // Build the call to the assignment operator. 4684 4685 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4686 OpEqualRef.takeAs<Expr>(), 4687 Loc, &From, 1, Loc); 4688 if (Call.isInvalid()) 4689 return StmtError(); 4690 4691 return S.Owned(Call.takeAs<Stmt>()); 4692 } 4693 4694 // - if the subobject is of scalar type, the built-in assignment 4695 // operator is used. 4696 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4697 if (!ArrayTy) { 4698 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4699 if (Assignment.isInvalid()) 4700 return StmtError(); 4701 4702 return S.Owned(Assignment.takeAs<Stmt>()); 4703 } 4704 4705 // - if the subobject is an array, each element is assigned, in the 4706 // manner appropriate to the element type; 4707 4708 // Construct a loop over the array bounds, e.g., 4709 // 4710 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4711 // 4712 // that will copy each of the array elements. 4713 QualType SizeType = S.Context.getSizeType(); 4714 4715 // Create the iteration variable. 4716 IdentifierInfo *IterationVarName = 0; 4717 { 4718 llvm::SmallString<8> Str; 4719 llvm::raw_svector_ostream OS(Str); 4720 OS << "__i" << Depth; 4721 IterationVarName = &S.Context.Idents.get(OS.str()); 4722 } 4723 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4724 IterationVarName, SizeType, 4725 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4726 SC_None, SC_None); 4727 4728 // Initialize the iteration variable to zero. 4729 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4730 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4731 4732 // Create a reference to the iteration variable; we'll use this several 4733 // times throughout. 4734 Expr *IterationVarRef 4735 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4736 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4737 4738 // Create the DeclStmt that holds the iteration variable. 4739 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4740 4741 // Create the comparison against the array bound. 4742 llvm::APInt Upper = ArrayTy->getSize(); 4743 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4744 Expr *Comparison 4745 = new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4746 IntegerLiteral::Create(S.Context, 4747 Upper, SizeType, Loc), 4748 BO_NE, S.Context.BoolTy, Loc); 4749 4750 // Create the pre-increment of the iteration variable. 4751 Expr *Increment 4752 = new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4753 UO_PreInc, 4754 SizeType, Loc); 4755 4756 // Subscript the "from" and "to" expressions with the iteration variable. 4757 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4758 IterationVarRef, Loc)); 4759 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4760 IterationVarRef, Loc)); 4761 4762 // Build the copy for an individual element of the array. 4763 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4764 ArrayTy->getElementType(), 4765 To, From, 4766 CopyingBaseSubobject, Depth+1); 4767 if (Copy.isInvalid()) 4768 return StmtError(); 4769 4770 // Construct the loop that copies all elements of this array. 4771 return S.ActOnForStmt(Loc, Loc, InitStmt, 4772 S.MakeFullExpr(Comparison), 4773 0, S.MakeFullExpr(Increment), 4774 Loc, Copy.take()); 4775} 4776 4777/// \brief Determine whether the given class has a copy assignment operator 4778/// that accepts a const-qualified argument. 4779static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4780 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4781 4782 if (!Class->hasDeclaredCopyAssignment()) 4783 S.DeclareImplicitCopyAssignment(Class); 4784 4785 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4786 DeclarationName OpName 4787 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4788 4789 DeclContext::lookup_const_iterator Op, OpEnd; 4790 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4791 // C++ [class.copy]p9: 4792 // A user-declared copy assignment operator is a non-static non-template 4793 // member function of class X with exactly one parameter of type X, X&, 4794 // const X&, volatile X& or const volatile X&. 4795 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4796 if (!Method) 4797 continue; 4798 4799 if (Method->isStatic()) 4800 continue; 4801 if (Method->getPrimaryTemplate()) 4802 continue; 4803 const FunctionProtoType *FnType = 4804 Method->getType()->getAs<FunctionProtoType>(); 4805 assert(FnType && "Overloaded operator has no prototype."); 4806 // Don't assert on this; an invalid decl might have been left in the AST. 4807 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4808 continue; 4809 bool AcceptsConst = true; 4810 QualType ArgType = FnType->getArgType(0); 4811 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4812 ArgType = Ref->getPointeeType(); 4813 // Is it a non-const lvalue reference? 4814 if (!ArgType.isConstQualified()) 4815 AcceptsConst = false; 4816 } 4817 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4818 continue; 4819 4820 // We have a single argument of type cv X or cv X&, i.e. we've found the 4821 // copy assignment operator. Return whether it accepts const arguments. 4822 return AcceptsConst; 4823 } 4824 assert(Class->isInvalidDecl() && 4825 "No copy assignment operator declared in valid code."); 4826 return false; 4827} 4828 4829CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4830 // Note: The following rules are largely analoguous to the copy 4831 // constructor rules. Note that virtual bases are not taken into account 4832 // for determining the argument type of the operator. Note also that 4833 // operators taking an object instead of a reference are allowed. 4834 4835 4836 // C++ [class.copy]p10: 4837 // If the class definition does not explicitly declare a copy 4838 // assignment operator, one is declared implicitly. 4839 // The implicitly-defined copy assignment operator for a class X 4840 // will have the form 4841 // 4842 // X& X::operator=(const X&) 4843 // 4844 // if 4845 bool HasConstCopyAssignment = true; 4846 4847 // -- each direct base class B of X has a copy assignment operator 4848 // whose parameter is of type const B&, const volatile B& or B, 4849 // and 4850 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4851 BaseEnd = ClassDecl->bases_end(); 4852 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4853 assert(!Base->getType()->isDependentType() && 4854 "Cannot generate implicit members for class with dependent bases."); 4855 const CXXRecordDecl *BaseClassDecl 4856 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4857 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4858 } 4859 4860 // -- for all the nonstatic data members of X that are of a class 4861 // type M (or array thereof), each such class type has a copy 4862 // assignment operator whose parameter is of type const M&, 4863 // const volatile M& or M. 4864 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4865 FieldEnd = ClassDecl->field_end(); 4866 HasConstCopyAssignment && Field != FieldEnd; 4867 ++Field) { 4868 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4869 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4870 const CXXRecordDecl *FieldClassDecl 4871 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4872 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4873 } 4874 } 4875 4876 // Otherwise, the implicitly declared copy assignment operator will 4877 // have the form 4878 // 4879 // X& X::operator=(X&) 4880 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4881 QualType RetType = Context.getLValueReferenceType(ArgType); 4882 if (HasConstCopyAssignment) 4883 ArgType = ArgType.withConst(); 4884 ArgType = Context.getLValueReferenceType(ArgType); 4885 4886 // C++ [except.spec]p14: 4887 // An implicitly declared special member function (Clause 12) shall have an 4888 // exception-specification. [...] 4889 ImplicitExceptionSpecification ExceptSpec(Context); 4890 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4891 BaseEnd = ClassDecl->bases_end(); 4892 Base != BaseEnd; ++Base) { 4893 CXXRecordDecl *BaseClassDecl 4894 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4895 4896 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4897 DeclareImplicitCopyAssignment(BaseClassDecl); 4898 4899 if (CXXMethodDecl *CopyAssign 4900 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4901 ExceptSpec.CalledDecl(CopyAssign); 4902 } 4903 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4904 FieldEnd = ClassDecl->field_end(); 4905 Field != FieldEnd; 4906 ++Field) { 4907 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4908 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4909 CXXRecordDecl *FieldClassDecl 4910 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4911 4912 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4913 DeclareImplicitCopyAssignment(FieldClassDecl); 4914 4915 if (CXXMethodDecl *CopyAssign 4916 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4917 ExceptSpec.CalledDecl(CopyAssign); 4918 } 4919 } 4920 4921 // An implicitly-declared copy assignment operator is an inline public 4922 // member of its class. 4923 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4924 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4925 CXXMethodDecl *CopyAssignment 4926 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4927 Context.getFunctionType(RetType, &ArgType, 1, 4928 false, 0, 4929 ExceptSpec.hasExceptionSpecification(), 4930 ExceptSpec.hasAnyExceptionSpecification(), 4931 ExceptSpec.size(), 4932 ExceptSpec.data(), 4933 FunctionType::ExtInfo()), 4934 /*TInfo=*/0, /*isStatic=*/false, 4935 /*StorageClassAsWritten=*/SC_None, 4936 /*isInline=*/true); 4937 CopyAssignment->setAccess(AS_public); 4938 CopyAssignment->setImplicit(); 4939 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4940 CopyAssignment->setCopyAssignment(true); 4941 4942 // Add the parameter to the operator. 4943 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4944 ClassDecl->getLocation(), 4945 /*Id=*/0, 4946 ArgType, /*TInfo=*/0, 4947 SC_None, 4948 SC_None, 0); 4949 CopyAssignment->setParams(&FromParam, 1); 4950 4951 // Note that we have added this copy-assignment operator. 4952 ClassDecl->setDeclaredCopyAssignment(true); 4953 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4954 4955 if (Scope *S = getScopeForContext(ClassDecl)) 4956 PushOnScopeChains(CopyAssignment, S, false); 4957 ClassDecl->addDecl(CopyAssignment); 4958 4959 AddOverriddenMethods(ClassDecl, CopyAssignment); 4960 return CopyAssignment; 4961} 4962 4963void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4964 CXXMethodDecl *CopyAssignOperator) { 4965 assert((CopyAssignOperator->isImplicit() && 4966 CopyAssignOperator->isOverloadedOperator() && 4967 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4968 !CopyAssignOperator->isUsed(false)) && 4969 "DefineImplicitCopyAssignment called for wrong function"); 4970 4971 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4972 4973 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4974 CopyAssignOperator->setInvalidDecl(); 4975 return; 4976 } 4977 4978 CopyAssignOperator->setUsed(); 4979 4980 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4981 ErrorTrap Trap(*this); 4982 4983 // C++0x [class.copy]p30: 4984 // The implicitly-defined or explicitly-defaulted copy assignment operator 4985 // for a non-union class X performs memberwise copy assignment of its 4986 // subobjects. The direct base classes of X are assigned first, in the 4987 // order of their declaration in the base-specifier-list, and then the 4988 // immediate non-static data members of X are assigned, in the order in 4989 // which they were declared in the class definition. 4990 4991 // The statements that form the synthesized function body. 4992 ASTOwningVector<Stmt*> Statements(*this); 4993 4994 // The parameter for the "other" object, which we are copying from. 4995 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4996 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4997 QualType OtherRefType = Other->getType(); 4998 if (const LValueReferenceType *OtherRef 4999 = OtherRefType->getAs<LValueReferenceType>()) { 5000 OtherRefType = OtherRef->getPointeeType(); 5001 OtherQuals = OtherRefType.getQualifiers(); 5002 } 5003 5004 // Our location for everything implicitly-generated. 5005 SourceLocation Loc = CopyAssignOperator->getLocation(); 5006 5007 // Construct a reference to the "other" object. We'll be using this 5008 // throughout the generated ASTs. 5009 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 5010 assert(OtherRef && "Reference to parameter cannot fail!"); 5011 5012 // Construct the "this" pointer. We'll be using this throughout the generated 5013 // ASTs. 5014 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5015 assert(This && "Reference to this cannot fail!"); 5016 5017 // Assign base classes. 5018 bool Invalid = false; 5019 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5020 E = ClassDecl->bases_end(); Base != E; ++Base) { 5021 // Form the assignment: 5022 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5023 QualType BaseType = Base->getType().getUnqualifiedType(); 5024 CXXRecordDecl *BaseClassDecl = 0; 5025 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 5026 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 5027 else { 5028 Invalid = true; 5029 continue; 5030 } 5031 5032 CXXCastPath BasePath; 5033 BasePath.push_back(Base); 5034 5035 // Construct the "from" expression, which is an implicit cast to the 5036 // appropriately-qualified base type. 5037 Expr *From = OtherRef->Retain(); 5038 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5039 CK_UncheckedDerivedToBase, 5040 VK_LValue, &BasePath); 5041 5042 // Dereference "this". 5043 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5044 5045 // Implicitly cast "this" to the appropriately-qualified base type. 5046 Expr *ToE = To.takeAs<Expr>(); 5047 ImpCastExprToType(ToE, 5048 Context.getCVRQualifiedType(BaseType, 5049 CopyAssignOperator->getTypeQualifiers()), 5050 CK_UncheckedDerivedToBase, 5051 VK_LValue, &BasePath); 5052 To = Owned(ToE); 5053 5054 // Build the copy. 5055 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5056 To.get(), From, 5057 /*CopyingBaseSubobject=*/true); 5058 if (Copy.isInvalid()) { 5059 Diag(CurrentLocation, diag::note_member_synthesized_at) 5060 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5061 CopyAssignOperator->setInvalidDecl(); 5062 return; 5063 } 5064 5065 // Success! Record the copy. 5066 Statements.push_back(Copy.takeAs<Expr>()); 5067 } 5068 5069 // \brief Reference to the __builtin_memcpy function. 5070 Expr *BuiltinMemCpyRef = 0; 5071 // \brief Reference to the __builtin_objc_memmove_collectable function. 5072 Expr *CollectableMemCpyRef = 0; 5073 5074 // Assign non-static members. 5075 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5076 FieldEnd = ClassDecl->field_end(); 5077 Field != FieldEnd; ++Field) { 5078 // Check for members of reference type; we can't copy those. 5079 if (Field->getType()->isReferenceType()) { 5080 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5081 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5082 Diag(Field->getLocation(), diag::note_declared_at); 5083 Diag(CurrentLocation, diag::note_member_synthesized_at) 5084 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5085 Invalid = true; 5086 continue; 5087 } 5088 5089 // Check for members of const-qualified, non-class type. 5090 QualType BaseType = Context.getBaseElementType(Field->getType()); 5091 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5092 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5093 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5094 Diag(Field->getLocation(), diag::note_declared_at); 5095 Diag(CurrentLocation, diag::note_member_synthesized_at) 5096 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5097 Invalid = true; 5098 continue; 5099 } 5100 5101 QualType FieldType = Field->getType().getNonReferenceType(); 5102 if (FieldType->isIncompleteArrayType()) { 5103 assert(ClassDecl->hasFlexibleArrayMember() && 5104 "Incomplete array type is not valid"); 5105 continue; 5106 } 5107 5108 // Build references to the field in the object we're copying from and to. 5109 CXXScopeSpec SS; // Intentionally empty 5110 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5111 LookupMemberName); 5112 MemberLookup.addDecl(*Field); 5113 MemberLookup.resolveKind(); 5114 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5115 Loc, /*IsArrow=*/false, 5116 SS, 0, MemberLookup, 0); 5117 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5118 Loc, /*IsArrow=*/true, 5119 SS, 0, MemberLookup, 0); 5120 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5121 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5122 5123 // If the field should be copied with __builtin_memcpy rather than via 5124 // explicit assignments, do so. This optimization only applies for arrays 5125 // of scalars and arrays of class type with trivial copy-assignment 5126 // operators. 5127 if (FieldType->isArrayType() && 5128 (!BaseType->isRecordType() || 5129 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5130 ->hasTrivialCopyAssignment())) { 5131 // Compute the size of the memory buffer to be copied. 5132 QualType SizeType = Context.getSizeType(); 5133 llvm::APInt Size(Context.getTypeSize(SizeType), 5134 Context.getTypeSizeInChars(BaseType).getQuantity()); 5135 for (const ConstantArrayType *Array 5136 = Context.getAsConstantArrayType(FieldType); 5137 Array; 5138 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5139 llvm::APInt ArraySize = Array->getSize(); 5140 ArraySize.zextOrTrunc(Size.getBitWidth()); 5141 Size *= ArraySize; 5142 } 5143 5144 // Take the address of the field references for "from" and "to". 5145 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5146 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5147 5148 bool NeedsCollectableMemCpy = 5149 (BaseType->isRecordType() && 5150 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5151 5152 if (NeedsCollectableMemCpy) { 5153 if (!CollectableMemCpyRef) { 5154 // Create a reference to the __builtin_objc_memmove_collectable function. 5155 LookupResult R(*this, 5156 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5157 Loc, LookupOrdinaryName); 5158 LookupName(R, TUScope, true); 5159 5160 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5161 if (!CollectableMemCpy) { 5162 // Something went horribly wrong earlier, and we will have 5163 // complained about it. 5164 Invalid = true; 5165 continue; 5166 } 5167 5168 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5169 CollectableMemCpy->getType(), 5170 Loc, 0).takeAs<Expr>(); 5171 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5172 } 5173 } 5174 // Create a reference to the __builtin_memcpy builtin function. 5175 else if (!BuiltinMemCpyRef) { 5176 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5177 LookupOrdinaryName); 5178 LookupName(R, TUScope, true); 5179 5180 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5181 if (!BuiltinMemCpy) { 5182 // Something went horribly wrong earlier, and we will have complained 5183 // about it. 5184 Invalid = true; 5185 continue; 5186 } 5187 5188 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5189 BuiltinMemCpy->getType(), 5190 Loc, 0).takeAs<Expr>(); 5191 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5192 } 5193 5194 ASTOwningVector<Expr*> CallArgs(*this); 5195 CallArgs.push_back(To.takeAs<Expr>()); 5196 CallArgs.push_back(From.takeAs<Expr>()); 5197 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5198 ExprResult Call = ExprError(); 5199 if (NeedsCollectableMemCpy) 5200 Call = ActOnCallExpr(/*Scope=*/0, 5201 CollectableMemCpyRef, 5202 Loc, move_arg(CallArgs), 5203 Loc); 5204 else 5205 Call = ActOnCallExpr(/*Scope=*/0, 5206 BuiltinMemCpyRef, 5207 Loc, move_arg(CallArgs), 5208 Loc); 5209 5210 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5211 Statements.push_back(Call.takeAs<Expr>()); 5212 continue; 5213 } 5214 5215 // Build the copy of this field. 5216 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5217 To.get(), From.get(), 5218 /*CopyingBaseSubobject=*/false); 5219 if (Copy.isInvalid()) { 5220 Diag(CurrentLocation, diag::note_member_synthesized_at) 5221 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5222 CopyAssignOperator->setInvalidDecl(); 5223 return; 5224 } 5225 5226 // Success! Record the copy. 5227 Statements.push_back(Copy.takeAs<Stmt>()); 5228 } 5229 5230 if (!Invalid) { 5231 // Add a "return *this;" 5232 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5233 5234 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5235 if (Return.isInvalid()) 5236 Invalid = true; 5237 else { 5238 Statements.push_back(Return.takeAs<Stmt>()); 5239 5240 if (Trap.hasErrorOccurred()) { 5241 Diag(CurrentLocation, diag::note_member_synthesized_at) 5242 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5243 Invalid = true; 5244 } 5245 } 5246 } 5247 5248 if (Invalid) { 5249 CopyAssignOperator->setInvalidDecl(); 5250 return; 5251 } 5252 5253 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5254 /*isStmtExpr=*/false); 5255 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5256 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5257} 5258 5259CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5260 CXXRecordDecl *ClassDecl) { 5261 // C++ [class.copy]p4: 5262 // If the class definition does not explicitly declare a copy 5263 // constructor, one is declared implicitly. 5264 5265 // C++ [class.copy]p5: 5266 // The implicitly-declared copy constructor for a class X will 5267 // have the form 5268 // 5269 // X::X(const X&) 5270 // 5271 // if 5272 bool HasConstCopyConstructor = true; 5273 5274 // -- each direct or virtual base class B of X has a copy 5275 // constructor whose first parameter is of type const B& or 5276 // const volatile B&, and 5277 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5278 BaseEnd = ClassDecl->bases_end(); 5279 HasConstCopyConstructor && Base != BaseEnd; 5280 ++Base) { 5281 // Virtual bases are handled below. 5282 if (Base->isVirtual()) 5283 continue; 5284 5285 CXXRecordDecl *BaseClassDecl 5286 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5287 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5288 DeclareImplicitCopyConstructor(BaseClassDecl); 5289 5290 HasConstCopyConstructor 5291 = BaseClassDecl->hasConstCopyConstructor(Context); 5292 } 5293 5294 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5295 BaseEnd = ClassDecl->vbases_end(); 5296 HasConstCopyConstructor && Base != BaseEnd; 5297 ++Base) { 5298 CXXRecordDecl *BaseClassDecl 5299 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5300 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5301 DeclareImplicitCopyConstructor(BaseClassDecl); 5302 5303 HasConstCopyConstructor 5304 = BaseClassDecl->hasConstCopyConstructor(Context); 5305 } 5306 5307 // -- for all the nonstatic data members of X that are of a 5308 // class type M (or array thereof), each such class type 5309 // has a copy constructor whose first parameter is of type 5310 // const M& or const volatile M&. 5311 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5312 FieldEnd = ClassDecl->field_end(); 5313 HasConstCopyConstructor && Field != FieldEnd; 5314 ++Field) { 5315 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5316 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5317 CXXRecordDecl *FieldClassDecl 5318 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5319 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5320 DeclareImplicitCopyConstructor(FieldClassDecl); 5321 5322 HasConstCopyConstructor 5323 = FieldClassDecl->hasConstCopyConstructor(Context); 5324 } 5325 } 5326 5327 // Otherwise, the implicitly declared copy constructor will have 5328 // the form 5329 // 5330 // X::X(X&) 5331 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5332 QualType ArgType = ClassType; 5333 if (HasConstCopyConstructor) 5334 ArgType = ArgType.withConst(); 5335 ArgType = Context.getLValueReferenceType(ArgType); 5336 5337 // C++ [except.spec]p14: 5338 // An implicitly declared special member function (Clause 12) shall have an 5339 // exception-specification. [...] 5340 ImplicitExceptionSpecification ExceptSpec(Context); 5341 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5342 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5343 BaseEnd = ClassDecl->bases_end(); 5344 Base != BaseEnd; 5345 ++Base) { 5346 // Virtual bases are handled below. 5347 if (Base->isVirtual()) 5348 continue; 5349 5350 CXXRecordDecl *BaseClassDecl 5351 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5352 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5353 DeclareImplicitCopyConstructor(BaseClassDecl); 5354 5355 if (CXXConstructorDecl *CopyConstructor 5356 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5357 ExceptSpec.CalledDecl(CopyConstructor); 5358 } 5359 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5360 BaseEnd = ClassDecl->vbases_end(); 5361 Base != BaseEnd; 5362 ++Base) { 5363 CXXRecordDecl *BaseClassDecl 5364 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5365 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5366 DeclareImplicitCopyConstructor(BaseClassDecl); 5367 5368 if (CXXConstructorDecl *CopyConstructor 5369 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5370 ExceptSpec.CalledDecl(CopyConstructor); 5371 } 5372 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5373 FieldEnd = ClassDecl->field_end(); 5374 Field != FieldEnd; 5375 ++Field) { 5376 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5377 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5378 CXXRecordDecl *FieldClassDecl 5379 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5380 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5381 DeclareImplicitCopyConstructor(FieldClassDecl); 5382 5383 if (CXXConstructorDecl *CopyConstructor 5384 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5385 ExceptSpec.CalledDecl(CopyConstructor); 5386 } 5387 } 5388 5389 // An implicitly-declared copy constructor is an inline public 5390 // member of its class. 5391 DeclarationName Name 5392 = Context.DeclarationNames.getCXXConstructorName( 5393 Context.getCanonicalType(ClassType)); 5394 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5395 CXXConstructorDecl *CopyConstructor 5396 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5397 Context.getFunctionType(Context.VoidTy, 5398 &ArgType, 1, 5399 false, 0, 5400 ExceptSpec.hasExceptionSpecification(), 5401 ExceptSpec.hasAnyExceptionSpecification(), 5402 ExceptSpec.size(), 5403 ExceptSpec.data(), 5404 FunctionType::ExtInfo()), 5405 /*TInfo=*/0, 5406 /*isExplicit=*/false, 5407 /*isInline=*/true, 5408 /*isImplicitlyDeclared=*/true); 5409 CopyConstructor->setAccess(AS_public); 5410 CopyConstructor->setImplicit(); 5411 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5412 5413 // Note that we have declared this constructor. 5414 ClassDecl->setDeclaredCopyConstructor(true); 5415 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5416 5417 // Add the parameter to the constructor. 5418 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5419 ClassDecl->getLocation(), 5420 /*IdentifierInfo=*/0, 5421 ArgType, /*TInfo=*/0, 5422 SC_None, 5423 SC_None, 0); 5424 CopyConstructor->setParams(&FromParam, 1); 5425 if (Scope *S = getScopeForContext(ClassDecl)) 5426 PushOnScopeChains(CopyConstructor, S, false); 5427 ClassDecl->addDecl(CopyConstructor); 5428 5429 return CopyConstructor; 5430} 5431 5432void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5433 CXXConstructorDecl *CopyConstructor, 5434 unsigned TypeQuals) { 5435 assert((CopyConstructor->isImplicit() && 5436 CopyConstructor->isCopyConstructor(TypeQuals) && 5437 !CopyConstructor->isUsed(false)) && 5438 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5439 5440 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5441 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5442 5443 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5444 ErrorTrap Trap(*this); 5445 5446 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5447 Trap.hasErrorOccurred()) { 5448 Diag(CurrentLocation, diag::note_member_synthesized_at) 5449 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5450 CopyConstructor->setInvalidDecl(); 5451 } else { 5452 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5453 CopyConstructor->getLocation(), 5454 MultiStmtArg(*this, 0, 0), 5455 /*isStmtExpr=*/false) 5456 .takeAs<Stmt>()); 5457 } 5458 5459 CopyConstructor->setUsed(); 5460} 5461 5462ExprResult 5463Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5464 CXXConstructorDecl *Constructor, 5465 MultiExprArg ExprArgs, 5466 bool RequiresZeroInit, 5467 unsigned ConstructKind) { 5468 bool Elidable = false; 5469 5470 // C++0x [class.copy]p34: 5471 // When certain criteria are met, an implementation is allowed to 5472 // omit the copy/move construction of a class object, even if the 5473 // copy/move constructor and/or destructor for the object have 5474 // side effects. [...] 5475 // - when a temporary class object that has not been bound to a 5476 // reference (12.2) would be copied/moved to a class object 5477 // with the same cv-unqualified type, the copy/move operation 5478 // can be omitted by constructing the temporary object 5479 // directly into the target of the omitted copy/move 5480 if (ConstructKind == CXXConstructExpr::CK_Complete && 5481 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5482 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5483 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5484 } 5485 5486 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5487 Elidable, move(ExprArgs), RequiresZeroInit, 5488 ConstructKind); 5489} 5490 5491/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5492/// including handling of its default argument expressions. 5493ExprResult 5494Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5495 CXXConstructorDecl *Constructor, bool Elidable, 5496 MultiExprArg ExprArgs, 5497 bool RequiresZeroInit, 5498 unsigned ConstructKind) { 5499 unsigned NumExprs = ExprArgs.size(); 5500 Expr **Exprs = (Expr **)ExprArgs.release(); 5501 5502 MarkDeclarationReferenced(ConstructLoc, Constructor); 5503 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5504 Constructor, Elidable, Exprs, NumExprs, 5505 RequiresZeroInit, 5506 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind))); 5507} 5508 5509bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5510 CXXConstructorDecl *Constructor, 5511 MultiExprArg Exprs) { 5512 ExprResult TempResult = 5513 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5514 move(Exprs), false, CXXConstructExpr::CK_Complete); 5515 if (TempResult.isInvalid()) 5516 return true; 5517 5518 Expr *Temp = TempResult.takeAs<Expr>(); 5519 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5520 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5521 VD->setInit(Temp); 5522 5523 return false; 5524} 5525 5526void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5527 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5528 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5529 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5530 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5531 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5532 CheckDestructorAccess(VD->getLocation(), Destructor, 5533 PDiag(diag::err_access_dtor_var) 5534 << VD->getDeclName() 5535 << VD->getType()); 5536 5537 // TODO: this should be re-enabled for static locals by !CXAAtExit 5538 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5539 Diag(VD->getLocation(), diag::warn_global_destructor); 5540 } 5541} 5542 5543/// AddCXXDirectInitializerToDecl - This action is called immediately after 5544/// ActOnDeclarator, when a C++ direct initializer is present. 5545/// e.g: "int x(1);" 5546void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5547 SourceLocation LParenLoc, 5548 MultiExprArg Exprs, 5549 SourceLocation RParenLoc) { 5550 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5551 5552 // If there is no declaration, there was an error parsing it. Just ignore 5553 // the initializer. 5554 if (RealDecl == 0) 5555 return; 5556 5557 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5558 if (!VDecl) { 5559 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5560 RealDecl->setInvalidDecl(); 5561 return; 5562 } 5563 5564 // We will represent direct-initialization similarly to copy-initialization: 5565 // int x(1); -as-> int x = 1; 5566 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5567 // 5568 // Clients that want to distinguish between the two forms, can check for 5569 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5570 // A major benefit is that clients that don't particularly care about which 5571 // exactly form was it (like the CodeGen) can handle both cases without 5572 // special case code. 5573 5574 // C++ 8.5p11: 5575 // The form of initialization (using parentheses or '=') is generally 5576 // insignificant, but does matter when the entity being initialized has a 5577 // class type. 5578 5579 if (!VDecl->getType()->isDependentType() && 5580 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5581 diag::err_typecheck_decl_incomplete_type)) { 5582 VDecl->setInvalidDecl(); 5583 return; 5584 } 5585 5586 // The variable can not have an abstract class type. 5587 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5588 diag::err_abstract_type_in_decl, 5589 AbstractVariableType)) 5590 VDecl->setInvalidDecl(); 5591 5592 const VarDecl *Def; 5593 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5594 Diag(VDecl->getLocation(), diag::err_redefinition) 5595 << VDecl->getDeclName(); 5596 Diag(Def->getLocation(), diag::note_previous_definition); 5597 VDecl->setInvalidDecl(); 5598 return; 5599 } 5600 5601 // C++ [class.static.data]p4 5602 // If a static data member is of const integral or const 5603 // enumeration type, its declaration in the class definition can 5604 // specify a constant-initializer which shall be an integral 5605 // constant expression (5.19). In that case, the member can appear 5606 // in integral constant expressions. The member shall still be 5607 // defined in a namespace scope if it is used in the program and the 5608 // namespace scope definition shall not contain an initializer. 5609 // 5610 // We already performed a redefinition check above, but for static 5611 // data members we also need to check whether there was an in-class 5612 // declaration with an initializer. 5613 const VarDecl* PrevInit = 0; 5614 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5615 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5616 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5617 return; 5618 } 5619 5620 // If either the declaration has a dependent type or if any of the 5621 // expressions is type-dependent, we represent the initialization 5622 // via a ParenListExpr for later use during template instantiation. 5623 if (VDecl->getType()->isDependentType() || 5624 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5625 // Let clients know that initialization was done with a direct initializer. 5626 VDecl->setCXXDirectInitializer(true); 5627 5628 // Store the initialization expressions as a ParenListExpr. 5629 unsigned NumExprs = Exprs.size(); 5630 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5631 (Expr **)Exprs.release(), 5632 NumExprs, RParenLoc)); 5633 return; 5634 } 5635 5636 // Capture the variable that is being initialized and the style of 5637 // initialization. 5638 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5639 5640 // FIXME: Poor source location information. 5641 InitializationKind Kind 5642 = InitializationKind::CreateDirect(VDecl->getLocation(), 5643 LParenLoc, RParenLoc); 5644 5645 InitializationSequence InitSeq(*this, Entity, Kind, 5646 Exprs.get(), Exprs.size()); 5647 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5648 if (Result.isInvalid()) { 5649 VDecl->setInvalidDecl(); 5650 return; 5651 } 5652 5653 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5654 VDecl->setInit(Result.takeAs<Expr>()); 5655 VDecl->setCXXDirectInitializer(true); 5656 5657 if (!VDecl->isInvalidDecl() && 5658 !VDecl->getDeclContext()->isDependentContext() && 5659 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5660 !VDecl->getInit()->isConstantInitializer(Context, 5661 VDecl->getType()->isReferenceType())) 5662 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5663 << VDecl->getInit()->getSourceRange(); 5664 5665 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5666 FinalizeVarWithDestructor(VDecl, Record); 5667} 5668 5669/// \brief Given a constructor and the set of arguments provided for the 5670/// constructor, convert the arguments and add any required default arguments 5671/// to form a proper call to this constructor. 5672/// 5673/// \returns true if an error occurred, false otherwise. 5674bool 5675Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5676 MultiExprArg ArgsPtr, 5677 SourceLocation Loc, 5678 ASTOwningVector<Expr*> &ConvertedArgs) { 5679 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5680 unsigned NumArgs = ArgsPtr.size(); 5681 Expr **Args = (Expr **)ArgsPtr.get(); 5682 5683 const FunctionProtoType *Proto 5684 = Constructor->getType()->getAs<FunctionProtoType>(); 5685 assert(Proto && "Constructor without a prototype?"); 5686 unsigned NumArgsInProto = Proto->getNumArgs(); 5687 5688 // If too few arguments are available, we'll fill in the rest with defaults. 5689 if (NumArgs < NumArgsInProto) 5690 ConvertedArgs.reserve(NumArgsInProto); 5691 else 5692 ConvertedArgs.reserve(NumArgs); 5693 5694 VariadicCallType CallType = 5695 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5696 llvm::SmallVector<Expr *, 8> AllArgs; 5697 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5698 Proto, 0, Args, NumArgs, AllArgs, 5699 CallType); 5700 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5701 ConvertedArgs.push_back(AllArgs[i]); 5702 return Invalid; 5703} 5704 5705static inline bool 5706CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5707 const FunctionDecl *FnDecl) { 5708 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5709 if (isa<NamespaceDecl>(DC)) { 5710 return SemaRef.Diag(FnDecl->getLocation(), 5711 diag::err_operator_new_delete_declared_in_namespace) 5712 << FnDecl->getDeclName(); 5713 } 5714 5715 if (isa<TranslationUnitDecl>(DC) && 5716 FnDecl->getStorageClass() == SC_Static) { 5717 return SemaRef.Diag(FnDecl->getLocation(), 5718 diag::err_operator_new_delete_declared_static) 5719 << FnDecl->getDeclName(); 5720 } 5721 5722 return false; 5723} 5724 5725static inline bool 5726CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5727 CanQualType ExpectedResultType, 5728 CanQualType ExpectedFirstParamType, 5729 unsigned DependentParamTypeDiag, 5730 unsigned InvalidParamTypeDiag) { 5731 QualType ResultType = 5732 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5733 5734 // Check that the result type is not dependent. 5735 if (ResultType->isDependentType()) 5736 return SemaRef.Diag(FnDecl->getLocation(), 5737 diag::err_operator_new_delete_dependent_result_type) 5738 << FnDecl->getDeclName() << ExpectedResultType; 5739 5740 // Check that the result type is what we expect. 5741 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5742 return SemaRef.Diag(FnDecl->getLocation(), 5743 diag::err_operator_new_delete_invalid_result_type) 5744 << FnDecl->getDeclName() << ExpectedResultType; 5745 5746 // A function template must have at least 2 parameters. 5747 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5748 return SemaRef.Diag(FnDecl->getLocation(), 5749 diag::err_operator_new_delete_template_too_few_parameters) 5750 << FnDecl->getDeclName(); 5751 5752 // The function decl must have at least 1 parameter. 5753 if (FnDecl->getNumParams() == 0) 5754 return SemaRef.Diag(FnDecl->getLocation(), 5755 diag::err_operator_new_delete_too_few_parameters) 5756 << FnDecl->getDeclName(); 5757 5758 // Check the the first parameter type is not dependent. 5759 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5760 if (FirstParamType->isDependentType()) 5761 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5762 << FnDecl->getDeclName() << ExpectedFirstParamType; 5763 5764 // Check that the first parameter type is what we expect. 5765 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5766 ExpectedFirstParamType) 5767 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5768 << FnDecl->getDeclName() << ExpectedFirstParamType; 5769 5770 return false; 5771} 5772 5773static bool 5774CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5775 // C++ [basic.stc.dynamic.allocation]p1: 5776 // A program is ill-formed if an allocation function is declared in a 5777 // namespace scope other than global scope or declared static in global 5778 // scope. 5779 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5780 return true; 5781 5782 CanQualType SizeTy = 5783 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5784 5785 // C++ [basic.stc.dynamic.allocation]p1: 5786 // The return type shall be void*. The first parameter shall have type 5787 // std::size_t. 5788 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5789 SizeTy, 5790 diag::err_operator_new_dependent_param_type, 5791 diag::err_operator_new_param_type)) 5792 return true; 5793 5794 // C++ [basic.stc.dynamic.allocation]p1: 5795 // The first parameter shall not have an associated default argument. 5796 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5797 return SemaRef.Diag(FnDecl->getLocation(), 5798 diag::err_operator_new_default_arg) 5799 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5800 5801 return false; 5802} 5803 5804static bool 5805CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5806 // C++ [basic.stc.dynamic.deallocation]p1: 5807 // A program is ill-formed if deallocation functions are declared in a 5808 // namespace scope other than global scope or declared static in global 5809 // scope. 5810 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5811 return true; 5812 5813 // C++ [basic.stc.dynamic.deallocation]p2: 5814 // Each deallocation function shall return void and its first parameter 5815 // shall be void*. 5816 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5817 SemaRef.Context.VoidPtrTy, 5818 diag::err_operator_delete_dependent_param_type, 5819 diag::err_operator_delete_param_type)) 5820 return true; 5821 5822 return false; 5823} 5824 5825/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5826/// of this overloaded operator is well-formed. If so, returns false; 5827/// otherwise, emits appropriate diagnostics and returns true. 5828bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5829 assert(FnDecl && FnDecl->isOverloadedOperator() && 5830 "Expected an overloaded operator declaration"); 5831 5832 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5833 5834 // C++ [over.oper]p5: 5835 // The allocation and deallocation functions, operator new, 5836 // operator new[], operator delete and operator delete[], are 5837 // described completely in 3.7.3. The attributes and restrictions 5838 // found in the rest of this subclause do not apply to them unless 5839 // explicitly stated in 3.7.3. 5840 if (Op == OO_Delete || Op == OO_Array_Delete) 5841 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5842 5843 if (Op == OO_New || Op == OO_Array_New) 5844 return CheckOperatorNewDeclaration(*this, FnDecl); 5845 5846 // C++ [over.oper]p6: 5847 // An operator function shall either be a non-static member 5848 // function or be a non-member function and have at least one 5849 // parameter whose type is a class, a reference to a class, an 5850 // enumeration, or a reference to an enumeration. 5851 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5852 if (MethodDecl->isStatic()) 5853 return Diag(FnDecl->getLocation(), 5854 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5855 } else { 5856 bool ClassOrEnumParam = false; 5857 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5858 ParamEnd = FnDecl->param_end(); 5859 Param != ParamEnd; ++Param) { 5860 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5861 if (ParamType->isDependentType() || ParamType->isRecordType() || 5862 ParamType->isEnumeralType()) { 5863 ClassOrEnumParam = true; 5864 break; 5865 } 5866 } 5867 5868 if (!ClassOrEnumParam) 5869 return Diag(FnDecl->getLocation(), 5870 diag::err_operator_overload_needs_class_or_enum) 5871 << FnDecl->getDeclName(); 5872 } 5873 5874 // C++ [over.oper]p8: 5875 // An operator function cannot have default arguments (8.3.6), 5876 // except where explicitly stated below. 5877 // 5878 // Only the function-call operator allows default arguments 5879 // (C++ [over.call]p1). 5880 if (Op != OO_Call) { 5881 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5882 Param != FnDecl->param_end(); ++Param) { 5883 if ((*Param)->hasDefaultArg()) 5884 return Diag((*Param)->getLocation(), 5885 diag::err_operator_overload_default_arg) 5886 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5887 } 5888 } 5889 5890 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5891 { false, false, false } 5892#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5893 , { Unary, Binary, MemberOnly } 5894#include "clang/Basic/OperatorKinds.def" 5895 }; 5896 5897 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5898 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5899 bool MustBeMemberOperator = OperatorUses[Op][2]; 5900 5901 // C++ [over.oper]p8: 5902 // [...] Operator functions cannot have more or fewer parameters 5903 // than the number required for the corresponding operator, as 5904 // described in the rest of this subclause. 5905 unsigned NumParams = FnDecl->getNumParams() 5906 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5907 if (Op != OO_Call && 5908 ((NumParams == 1 && !CanBeUnaryOperator) || 5909 (NumParams == 2 && !CanBeBinaryOperator) || 5910 (NumParams < 1) || (NumParams > 2))) { 5911 // We have the wrong number of parameters. 5912 unsigned ErrorKind; 5913 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5914 ErrorKind = 2; // 2 -> unary or binary. 5915 } else if (CanBeUnaryOperator) { 5916 ErrorKind = 0; // 0 -> unary 5917 } else { 5918 assert(CanBeBinaryOperator && 5919 "All non-call overloaded operators are unary or binary!"); 5920 ErrorKind = 1; // 1 -> binary 5921 } 5922 5923 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5924 << FnDecl->getDeclName() << NumParams << ErrorKind; 5925 } 5926 5927 // Overloaded operators other than operator() cannot be variadic. 5928 if (Op != OO_Call && 5929 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5930 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5931 << FnDecl->getDeclName(); 5932 } 5933 5934 // Some operators must be non-static member functions. 5935 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5936 return Diag(FnDecl->getLocation(), 5937 diag::err_operator_overload_must_be_member) 5938 << FnDecl->getDeclName(); 5939 } 5940 5941 // C++ [over.inc]p1: 5942 // The user-defined function called operator++ implements the 5943 // prefix and postfix ++ operator. If this function is a member 5944 // function with no parameters, or a non-member function with one 5945 // parameter of class or enumeration type, it defines the prefix 5946 // increment operator ++ for objects of that type. If the function 5947 // is a member function with one parameter (which shall be of type 5948 // int) or a non-member function with two parameters (the second 5949 // of which shall be of type int), it defines the postfix 5950 // increment operator ++ for objects of that type. 5951 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5952 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5953 bool ParamIsInt = false; 5954 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5955 ParamIsInt = BT->getKind() == BuiltinType::Int; 5956 5957 if (!ParamIsInt) 5958 return Diag(LastParam->getLocation(), 5959 diag::err_operator_overload_post_incdec_must_be_int) 5960 << LastParam->getType() << (Op == OO_MinusMinus); 5961 } 5962 5963 // Notify the class if it got an assignment operator. 5964 if (Op == OO_Equal) { 5965 // Would have returned earlier otherwise. 5966 assert(isa<CXXMethodDecl>(FnDecl) && 5967 "Overloaded = not member, but not filtered."); 5968 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5969 Method->getParent()->addedAssignmentOperator(Context, Method); 5970 } 5971 5972 return false; 5973} 5974 5975/// CheckLiteralOperatorDeclaration - Check whether the declaration 5976/// of this literal operator function is well-formed. If so, returns 5977/// false; otherwise, emits appropriate diagnostics and returns true. 5978bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5979 DeclContext *DC = FnDecl->getDeclContext(); 5980 Decl::Kind Kind = DC->getDeclKind(); 5981 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5982 Kind != Decl::LinkageSpec) { 5983 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5984 << FnDecl->getDeclName(); 5985 return true; 5986 } 5987 5988 bool Valid = false; 5989 5990 // template <char...> type operator "" name() is the only valid template 5991 // signature, and the only valid signature with no parameters. 5992 if (FnDecl->param_size() == 0) { 5993 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5994 // Must have only one template parameter 5995 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5996 if (Params->size() == 1) { 5997 NonTypeTemplateParmDecl *PmDecl = 5998 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5999 6000 // The template parameter must be a char parameter pack. 6001 // FIXME: This test will always fail because non-type parameter packs 6002 // have not been implemented. 6003 if (PmDecl && PmDecl->isTemplateParameterPack() && 6004 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6005 Valid = true; 6006 } 6007 } 6008 } else { 6009 // Check the first parameter 6010 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6011 6012 QualType T = (*Param)->getType(); 6013 6014 // unsigned long long int, long double, and any character type are allowed 6015 // as the only parameters. 6016 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6017 Context.hasSameType(T, Context.LongDoubleTy) || 6018 Context.hasSameType(T, Context.CharTy) || 6019 Context.hasSameType(T, Context.WCharTy) || 6020 Context.hasSameType(T, Context.Char16Ty) || 6021 Context.hasSameType(T, Context.Char32Ty)) { 6022 if (++Param == FnDecl->param_end()) 6023 Valid = true; 6024 goto FinishedParams; 6025 } 6026 6027 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6028 const PointerType *PT = T->getAs<PointerType>(); 6029 if (!PT) 6030 goto FinishedParams; 6031 T = PT->getPointeeType(); 6032 if (!T.isConstQualified()) 6033 goto FinishedParams; 6034 T = T.getUnqualifiedType(); 6035 6036 // Move on to the second parameter; 6037 ++Param; 6038 6039 // If there is no second parameter, the first must be a const char * 6040 if (Param == FnDecl->param_end()) { 6041 if (Context.hasSameType(T, Context.CharTy)) 6042 Valid = true; 6043 goto FinishedParams; 6044 } 6045 6046 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6047 // are allowed as the first parameter to a two-parameter function 6048 if (!(Context.hasSameType(T, Context.CharTy) || 6049 Context.hasSameType(T, Context.WCharTy) || 6050 Context.hasSameType(T, Context.Char16Ty) || 6051 Context.hasSameType(T, Context.Char32Ty))) 6052 goto FinishedParams; 6053 6054 // The second and final parameter must be an std::size_t 6055 T = (*Param)->getType().getUnqualifiedType(); 6056 if (Context.hasSameType(T, Context.getSizeType()) && 6057 ++Param == FnDecl->param_end()) 6058 Valid = true; 6059 } 6060 6061 // FIXME: This diagnostic is absolutely terrible. 6062FinishedParams: 6063 if (!Valid) { 6064 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6065 << FnDecl->getDeclName(); 6066 return true; 6067 } 6068 6069 return false; 6070} 6071 6072/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6073/// linkage specification, including the language and (if present) 6074/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6075/// the location of the language string literal, which is provided 6076/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6077/// the '{' brace. Otherwise, this linkage specification does not 6078/// have any braces. 6079Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 6080 SourceLocation ExternLoc, 6081 SourceLocation LangLoc, 6082 llvm::StringRef Lang, 6083 SourceLocation LBraceLoc) { 6084 LinkageSpecDecl::LanguageIDs Language; 6085 if (Lang == "\"C\"") 6086 Language = LinkageSpecDecl::lang_c; 6087 else if (Lang == "\"C++\"") 6088 Language = LinkageSpecDecl::lang_cxx; 6089 else { 6090 Diag(LangLoc, diag::err_bad_language); 6091 return 0; 6092 } 6093 6094 // FIXME: Add all the various semantics of linkage specifications 6095 6096 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6097 LangLoc, Language, 6098 LBraceLoc.isValid()); 6099 CurContext->addDecl(D); 6100 PushDeclContext(S, D); 6101 return D; 6102} 6103 6104/// ActOnFinishLinkageSpecification - Complete the definition of 6105/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6106/// valid, it's the position of the closing '}' brace in a linkage 6107/// specification that uses braces. 6108Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6109 Decl *LinkageSpec, 6110 SourceLocation RBraceLoc) { 6111 if (LinkageSpec) 6112 PopDeclContext(); 6113 return LinkageSpec; 6114} 6115 6116/// \brief Perform semantic analysis for the variable declaration that 6117/// occurs within a C++ catch clause, returning the newly-created 6118/// variable. 6119VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6120 TypeSourceInfo *TInfo, 6121 IdentifierInfo *Name, 6122 SourceLocation Loc) { 6123 bool Invalid = false; 6124 QualType ExDeclType = TInfo->getType(); 6125 6126 // Arrays and functions decay. 6127 if (ExDeclType->isArrayType()) 6128 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6129 else if (ExDeclType->isFunctionType()) 6130 ExDeclType = Context.getPointerType(ExDeclType); 6131 6132 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6133 // The exception-declaration shall not denote a pointer or reference to an 6134 // incomplete type, other than [cv] void*. 6135 // N2844 forbids rvalue references. 6136 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6137 Diag(Loc, diag::err_catch_rvalue_ref); 6138 Invalid = true; 6139 } 6140 6141 // GCC allows catching pointers and references to incomplete types 6142 // as an extension; so do we, but we warn by default. 6143 6144 QualType BaseType = ExDeclType; 6145 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6146 unsigned DK = diag::err_catch_incomplete; 6147 bool IncompleteCatchIsInvalid = true; 6148 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6149 BaseType = Ptr->getPointeeType(); 6150 Mode = 1; 6151 DK = diag::ext_catch_incomplete_ptr; 6152 IncompleteCatchIsInvalid = false; 6153 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6154 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6155 BaseType = Ref->getPointeeType(); 6156 Mode = 2; 6157 DK = diag::ext_catch_incomplete_ref; 6158 IncompleteCatchIsInvalid = false; 6159 } 6160 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6161 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6162 IncompleteCatchIsInvalid) 6163 Invalid = true; 6164 6165 if (!Invalid && !ExDeclType->isDependentType() && 6166 RequireNonAbstractType(Loc, ExDeclType, 6167 diag::err_abstract_type_in_decl, 6168 AbstractVariableType)) 6169 Invalid = true; 6170 6171 // Only the non-fragile NeXT runtime currently supports C++ catches 6172 // of ObjC types, and no runtime supports catching ObjC types by value. 6173 if (!Invalid && getLangOptions().ObjC1) { 6174 QualType T = ExDeclType; 6175 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6176 T = RT->getPointeeType(); 6177 6178 if (T->isObjCObjectType()) { 6179 Diag(Loc, diag::err_objc_object_catch); 6180 Invalid = true; 6181 } else if (T->isObjCObjectPointerType()) { 6182 if (!getLangOptions().NeXTRuntime) { 6183 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6184 Invalid = true; 6185 } else if (!getLangOptions().ObjCNonFragileABI) { 6186 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6187 Invalid = true; 6188 } 6189 } 6190 } 6191 6192 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6193 Name, ExDeclType, TInfo, SC_None, 6194 SC_None); 6195 ExDecl->setExceptionVariable(true); 6196 6197 if (!Invalid) { 6198 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6199 // C++ [except.handle]p16: 6200 // The object declared in an exception-declaration or, if the 6201 // exception-declaration does not specify a name, a temporary (12.2) is 6202 // copy-initialized (8.5) from the exception object. [...] 6203 // The object is destroyed when the handler exits, after the destruction 6204 // of any automatic objects initialized within the handler. 6205 // 6206 // We just pretend to initialize the object with itself, then make sure 6207 // it can be destroyed later. 6208 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6209 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6210 Loc, ExDeclType, 0); 6211 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6212 SourceLocation()); 6213 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6214 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6215 MultiExprArg(*this, &ExDeclRef, 1)); 6216 if (Result.isInvalid()) 6217 Invalid = true; 6218 else 6219 FinalizeVarWithDestructor(ExDecl, RecordTy); 6220 } 6221 } 6222 6223 if (Invalid) 6224 ExDecl->setInvalidDecl(); 6225 6226 return ExDecl; 6227} 6228 6229/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6230/// handler. 6231Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6232 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6233 QualType ExDeclType = TInfo->getType(); 6234 6235 bool Invalid = D.isInvalidType(); 6236 IdentifierInfo *II = D.getIdentifier(); 6237 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6238 LookupOrdinaryName, 6239 ForRedeclaration)) { 6240 // The scope should be freshly made just for us. There is just no way 6241 // it contains any previous declaration. 6242 assert(!S->isDeclScope(PrevDecl)); 6243 if (PrevDecl->isTemplateParameter()) { 6244 // Maybe we will complain about the shadowed template parameter. 6245 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6246 } 6247 } 6248 6249 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6250 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6251 << D.getCXXScopeSpec().getRange(); 6252 Invalid = true; 6253 } 6254 6255 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6256 D.getIdentifier(), 6257 D.getIdentifierLoc()); 6258 6259 if (Invalid) 6260 ExDecl->setInvalidDecl(); 6261 6262 // Add the exception declaration into this scope. 6263 if (II) 6264 PushOnScopeChains(ExDecl, S); 6265 else 6266 CurContext->addDecl(ExDecl); 6267 6268 ProcessDeclAttributes(S, ExDecl, D); 6269 return ExDecl; 6270} 6271 6272Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6273 Expr *AssertExpr, 6274 Expr *AssertMessageExpr_) { 6275 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6276 6277 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6278 llvm::APSInt Value(32); 6279 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6280 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6281 AssertExpr->getSourceRange(); 6282 return 0; 6283 } 6284 6285 if (Value == 0) { 6286 Diag(AssertLoc, diag::err_static_assert_failed) 6287 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6288 } 6289 } 6290 6291 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6292 AssertExpr, AssertMessage); 6293 6294 CurContext->addDecl(Decl); 6295 return Decl; 6296} 6297 6298/// \brief Perform semantic analysis of the given friend type declaration. 6299/// 6300/// \returns A friend declaration that. 6301FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6302 TypeSourceInfo *TSInfo) { 6303 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6304 6305 QualType T = TSInfo->getType(); 6306 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6307 6308 if (!getLangOptions().CPlusPlus0x) { 6309 // C++03 [class.friend]p2: 6310 // An elaborated-type-specifier shall be used in a friend declaration 6311 // for a class.* 6312 // 6313 // * The class-key of the elaborated-type-specifier is required. 6314 if (!ActiveTemplateInstantiations.empty()) { 6315 // Do not complain about the form of friend template types during 6316 // template instantiation; we will already have complained when the 6317 // template was declared. 6318 } else if (!T->isElaboratedTypeSpecifier()) { 6319 // If we evaluated the type to a record type, suggest putting 6320 // a tag in front. 6321 if (const RecordType *RT = T->getAs<RecordType>()) { 6322 RecordDecl *RD = RT->getDecl(); 6323 6324 std::string InsertionText = std::string(" ") + RD->getKindName(); 6325 6326 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6327 << (unsigned) RD->getTagKind() 6328 << T 6329 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6330 InsertionText); 6331 } else { 6332 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6333 << T 6334 << SourceRange(FriendLoc, TypeRange.getEnd()); 6335 } 6336 } else if (T->getAs<EnumType>()) { 6337 Diag(FriendLoc, diag::ext_enum_friend) 6338 << T 6339 << SourceRange(FriendLoc, TypeRange.getEnd()); 6340 } 6341 } 6342 6343 // C++0x [class.friend]p3: 6344 // If the type specifier in a friend declaration designates a (possibly 6345 // cv-qualified) class type, that class is declared as a friend; otherwise, 6346 // the friend declaration is ignored. 6347 6348 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6349 // in [class.friend]p3 that we do not implement. 6350 6351 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6352} 6353 6354/// Handle a friend type declaration. This works in tandem with 6355/// ActOnTag. 6356/// 6357/// Notes on friend class templates: 6358/// 6359/// We generally treat friend class declarations as if they were 6360/// declaring a class. So, for example, the elaborated type specifier 6361/// in a friend declaration is required to obey the restrictions of a 6362/// class-head (i.e. no typedefs in the scope chain), template 6363/// parameters are required to match up with simple template-ids, &c. 6364/// However, unlike when declaring a template specialization, it's 6365/// okay to refer to a template specialization without an empty 6366/// template parameter declaration, e.g. 6367/// friend class A<T>::B<unsigned>; 6368/// We permit this as a special case; if there are any template 6369/// parameters present at all, require proper matching, i.e. 6370/// template <> template <class T> friend class A<int>::B; 6371Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6372 MultiTemplateParamsArg TempParams) { 6373 SourceLocation Loc = DS.getSourceRange().getBegin(); 6374 6375 assert(DS.isFriendSpecified()); 6376 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6377 6378 // Try to convert the decl specifier to a type. This works for 6379 // friend templates because ActOnTag never produces a ClassTemplateDecl 6380 // for a TUK_Friend. 6381 Declarator TheDeclarator(DS, Declarator::MemberContext); 6382 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6383 QualType T = TSI->getType(); 6384 if (TheDeclarator.isInvalidType()) 6385 return 0; 6386 6387 // This is definitely an error in C++98. It's probably meant to 6388 // be forbidden in C++0x, too, but the specification is just 6389 // poorly written. 6390 // 6391 // The problem is with declarations like the following: 6392 // template <T> friend A<T>::foo; 6393 // where deciding whether a class C is a friend or not now hinges 6394 // on whether there exists an instantiation of A that causes 6395 // 'foo' to equal C. There are restrictions on class-heads 6396 // (which we declare (by fiat) elaborated friend declarations to 6397 // be) that makes this tractable. 6398 // 6399 // FIXME: handle "template <> friend class A<T>;", which 6400 // is possibly well-formed? Who even knows? 6401 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6402 Diag(Loc, diag::err_tagless_friend_type_template) 6403 << DS.getSourceRange(); 6404 return 0; 6405 } 6406 6407 // C++98 [class.friend]p1: A friend of a class is a function 6408 // or class that is not a member of the class . . . 6409 // This is fixed in DR77, which just barely didn't make the C++03 6410 // deadline. It's also a very silly restriction that seriously 6411 // affects inner classes and which nobody else seems to implement; 6412 // thus we never diagnose it, not even in -pedantic. 6413 // 6414 // But note that we could warn about it: it's always useless to 6415 // friend one of your own members (it's not, however, worthless to 6416 // friend a member of an arbitrary specialization of your template). 6417 6418 Decl *D; 6419 if (unsigned NumTempParamLists = TempParams.size()) 6420 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6421 NumTempParamLists, 6422 (TemplateParameterList**) TempParams.release(), 6423 TSI, 6424 DS.getFriendSpecLoc()); 6425 else 6426 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6427 6428 if (!D) 6429 return 0; 6430 6431 D->setAccess(AS_public); 6432 CurContext->addDecl(D); 6433 6434 return D; 6435} 6436 6437Decl *Sema::ActOnFriendFunctionDecl(Scope *S, 6438 Declarator &D, 6439 bool IsDefinition, 6440 MultiTemplateParamsArg TemplateParams) { 6441 const DeclSpec &DS = D.getDeclSpec(); 6442 6443 assert(DS.isFriendSpecified()); 6444 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6445 6446 SourceLocation Loc = D.getIdentifierLoc(); 6447 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6448 QualType T = TInfo->getType(); 6449 6450 // C++ [class.friend]p1 6451 // A friend of a class is a function or class.... 6452 // Note that this sees through typedefs, which is intended. 6453 // It *doesn't* see through dependent types, which is correct 6454 // according to [temp.arg.type]p3: 6455 // If a declaration acquires a function type through a 6456 // type dependent on a template-parameter and this causes 6457 // a declaration that does not use the syntactic form of a 6458 // function declarator to have a function type, the program 6459 // is ill-formed. 6460 if (!T->isFunctionType()) { 6461 Diag(Loc, diag::err_unexpected_friend); 6462 6463 // It might be worthwhile to try to recover by creating an 6464 // appropriate declaration. 6465 return 0; 6466 } 6467 6468 // C++ [namespace.memdef]p3 6469 // - If a friend declaration in a non-local class first declares a 6470 // class or function, the friend class or function is a member 6471 // of the innermost enclosing namespace. 6472 // - The name of the friend is not found by simple name lookup 6473 // until a matching declaration is provided in that namespace 6474 // scope (either before or after the class declaration granting 6475 // friendship). 6476 // - If a friend function is called, its name may be found by the 6477 // name lookup that considers functions from namespaces and 6478 // classes associated with the types of the function arguments. 6479 // - When looking for a prior declaration of a class or a function 6480 // declared as a friend, scopes outside the innermost enclosing 6481 // namespace scope are not considered. 6482 6483 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6484 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6485 DeclarationName Name = NameInfo.getName(); 6486 assert(Name); 6487 6488 // The context we found the declaration in, or in which we should 6489 // create the declaration. 6490 DeclContext *DC; 6491 6492 // FIXME: handle local classes 6493 6494 // Recover from invalid scope qualifiers as if they just weren't there. 6495 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6496 ForRedeclaration); 6497 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6498 DC = computeDeclContext(ScopeQual); 6499 6500 // FIXME: handle dependent contexts 6501 if (!DC) return 0; 6502 if (RequireCompleteDeclContext(ScopeQual, DC)) return 0; 6503 6504 LookupQualifiedName(Previous, DC); 6505 6506 // Ignore things found implicitly in the wrong scope. 6507 // TODO: better diagnostics for this case. Suggesting the right 6508 // qualified scope would be nice... 6509 LookupResult::Filter F = Previous.makeFilter(); 6510 while (F.hasNext()) { 6511 NamedDecl *D = F.next(); 6512 if (!DC->InEnclosingNamespaceSetOf( 6513 D->getDeclContext()->getRedeclContext())) 6514 F.erase(); 6515 } 6516 F.done(); 6517 6518 if (Previous.empty()) { 6519 D.setInvalidType(); 6520 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6521 return 0; 6522 } 6523 6524 // C++ [class.friend]p1: A friend of a class is a function or 6525 // class that is not a member of the class . . . 6526 if (DC->Equals(CurContext)) 6527 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6528 6529 // Otherwise walk out to the nearest namespace scope looking for matches. 6530 } else { 6531 // TODO: handle local class contexts. 6532 6533 DC = CurContext; 6534 while (true) { 6535 // Skip class contexts. If someone can cite chapter and verse 6536 // for this behavior, that would be nice --- it's what GCC and 6537 // EDG do, and it seems like a reasonable intent, but the spec 6538 // really only says that checks for unqualified existing 6539 // declarations should stop at the nearest enclosing namespace, 6540 // not that they should only consider the nearest enclosing 6541 // namespace. 6542 while (DC->isRecord()) 6543 DC = DC->getParent(); 6544 6545 LookupQualifiedName(Previous, DC); 6546 6547 // TODO: decide what we think about using declarations. 6548 if (!Previous.empty()) 6549 break; 6550 6551 if (DC->isFileContext()) break; 6552 DC = DC->getParent(); 6553 } 6554 6555 // C++ [class.friend]p1: A friend of a class is a function or 6556 // class that is not a member of the class . . . 6557 // C++0x changes this for both friend types and functions. 6558 // Most C++ 98 compilers do seem to give an error here, so 6559 // we do, too. 6560 if (!Previous.empty() && DC->Equals(CurContext) 6561 && !getLangOptions().CPlusPlus0x) 6562 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6563 } 6564 6565 if (DC->isFileContext()) { 6566 // This implies that it has to be an operator or function. 6567 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6568 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6569 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6570 Diag(Loc, diag::err_introducing_special_friend) << 6571 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6572 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6573 return 0; 6574 } 6575 } 6576 6577 bool Redeclaration = false; 6578 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6579 move(TemplateParams), 6580 IsDefinition, 6581 Redeclaration); 6582 if (!ND) return 0; 6583 6584 assert(ND->getDeclContext() == DC); 6585 assert(ND->getLexicalDeclContext() == CurContext); 6586 6587 // Add the function declaration to the appropriate lookup tables, 6588 // adjusting the redeclarations list as necessary. We don't 6589 // want to do this yet if the friending class is dependent. 6590 // 6591 // Also update the scope-based lookup if the target context's 6592 // lookup context is in lexical scope. 6593 if (!CurContext->isDependentContext()) { 6594 DC = DC->getRedeclContext(); 6595 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6596 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6597 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6598 } 6599 6600 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6601 D.getIdentifierLoc(), ND, 6602 DS.getFriendSpecLoc()); 6603 FrD->setAccess(AS_public); 6604 CurContext->addDecl(FrD); 6605 6606 return ND; 6607} 6608 6609void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6610 AdjustDeclIfTemplate(Dcl); 6611 6612 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6613 if (!Fn) { 6614 Diag(DelLoc, diag::err_deleted_non_function); 6615 return; 6616 } 6617 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6618 Diag(DelLoc, diag::err_deleted_decl_not_first); 6619 Diag(Prev->getLocation(), diag::note_previous_declaration); 6620 // If the declaration wasn't the first, we delete the function anyway for 6621 // recovery. 6622 } 6623 Fn->setDeleted(); 6624} 6625 6626static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6627 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6628 ++CI) { 6629 Stmt *SubStmt = *CI; 6630 if (!SubStmt) 6631 continue; 6632 if (isa<ReturnStmt>(SubStmt)) 6633 Self.Diag(SubStmt->getSourceRange().getBegin(), 6634 diag::err_return_in_constructor_handler); 6635 if (!isa<Expr>(SubStmt)) 6636 SearchForReturnInStmt(Self, SubStmt); 6637 } 6638} 6639 6640void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6641 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6642 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6643 SearchForReturnInStmt(*this, Handler); 6644 } 6645} 6646 6647bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6648 const CXXMethodDecl *Old) { 6649 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6650 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6651 6652 if (Context.hasSameType(NewTy, OldTy) || 6653 NewTy->isDependentType() || OldTy->isDependentType()) 6654 return false; 6655 6656 // Check if the return types are covariant 6657 QualType NewClassTy, OldClassTy; 6658 6659 /// Both types must be pointers or references to classes. 6660 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6661 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6662 NewClassTy = NewPT->getPointeeType(); 6663 OldClassTy = OldPT->getPointeeType(); 6664 } 6665 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6666 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6667 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6668 NewClassTy = NewRT->getPointeeType(); 6669 OldClassTy = OldRT->getPointeeType(); 6670 } 6671 } 6672 } 6673 6674 // The return types aren't either both pointers or references to a class type. 6675 if (NewClassTy.isNull()) { 6676 Diag(New->getLocation(), 6677 diag::err_different_return_type_for_overriding_virtual_function) 6678 << New->getDeclName() << NewTy << OldTy; 6679 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6680 6681 return true; 6682 } 6683 6684 // C++ [class.virtual]p6: 6685 // If the return type of D::f differs from the return type of B::f, the 6686 // class type in the return type of D::f shall be complete at the point of 6687 // declaration of D::f or shall be the class type D. 6688 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6689 if (!RT->isBeingDefined() && 6690 RequireCompleteType(New->getLocation(), NewClassTy, 6691 PDiag(diag::err_covariant_return_incomplete) 6692 << New->getDeclName())) 6693 return true; 6694 } 6695 6696 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6697 // Check if the new class derives from the old class. 6698 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6699 Diag(New->getLocation(), 6700 diag::err_covariant_return_not_derived) 6701 << New->getDeclName() << NewTy << OldTy; 6702 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6703 return true; 6704 } 6705 6706 // Check if we the conversion from derived to base is valid. 6707 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6708 diag::err_covariant_return_inaccessible_base, 6709 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6710 // FIXME: Should this point to the return type? 6711 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6712 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6713 return true; 6714 } 6715 } 6716 6717 // The qualifiers of the return types must be the same. 6718 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6719 Diag(New->getLocation(), 6720 diag::err_covariant_return_type_different_qualifications) 6721 << New->getDeclName() << NewTy << OldTy; 6722 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6723 return true; 6724 }; 6725 6726 6727 // The new class type must have the same or less qualifiers as the old type. 6728 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6729 Diag(New->getLocation(), 6730 diag::err_covariant_return_type_class_type_more_qualified) 6731 << New->getDeclName() << NewTy << OldTy; 6732 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6733 return true; 6734 }; 6735 6736 return false; 6737} 6738 6739bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6740 const CXXMethodDecl *Old) 6741{ 6742 if (Old->hasAttr<FinalAttr>()) { 6743 Diag(New->getLocation(), diag::err_final_function_overridden) 6744 << New->getDeclName(); 6745 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6746 return true; 6747 } 6748 6749 return false; 6750} 6751 6752/// \brief Mark the given method pure. 6753/// 6754/// \param Method the method to be marked pure. 6755/// 6756/// \param InitRange the source range that covers the "0" initializer. 6757bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6758 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6759 Method->setPure(); 6760 6761 // A class is abstract if at least one function is pure virtual. 6762 Method->getParent()->setAbstract(true); 6763 return false; 6764 } 6765 6766 if (!Method->isInvalidDecl()) 6767 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6768 << Method->getDeclName() << InitRange; 6769 return true; 6770} 6771 6772/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6773/// an initializer for the out-of-line declaration 'Dcl'. The scope 6774/// is a fresh scope pushed for just this purpose. 6775/// 6776/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6777/// static data member of class X, names should be looked up in the scope of 6778/// class X. 6779void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6780 // If there is no declaration, there was an error parsing it. 6781 if (D == 0) return; 6782 6783 // We should only get called for declarations with scope specifiers, like: 6784 // int foo::bar; 6785 assert(D->isOutOfLine()); 6786 EnterDeclaratorContext(S, D->getDeclContext()); 6787} 6788 6789/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6790/// initializer for the out-of-line declaration 'D'. 6791void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6792 // If there is no declaration, there was an error parsing it. 6793 if (D == 0) return; 6794 6795 assert(D->isOutOfLine()); 6796 ExitDeclaratorContext(S); 6797} 6798 6799/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6800/// C++ if/switch/while/for statement. 6801/// e.g: "if (int x = f()) {...}" 6802DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6803 // C++ 6.4p2: 6804 // The declarator shall not specify a function or an array. 6805 // The type-specifier-seq shall not contain typedef and shall not declare a 6806 // new class or enumeration. 6807 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6808 "Parser allowed 'typedef' as storage class of condition decl."); 6809 6810 TagDecl *OwnedTag = 0; 6811 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6812 QualType Ty = TInfo->getType(); 6813 6814 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6815 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6816 // would be created and CXXConditionDeclExpr wants a VarDecl. 6817 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6818 << D.getSourceRange(); 6819 return DeclResult(); 6820 } else if (OwnedTag && OwnedTag->isDefinition()) { 6821 // The type-specifier-seq shall not declare a new class or enumeration. 6822 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6823 } 6824 6825 Decl *Dcl = ActOnDeclarator(S, D); 6826 if (!Dcl) 6827 return DeclResult(); 6828 6829 return Dcl; 6830} 6831 6832void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6833 bool DefinitionRequired) { 6834 // Ignore any vtable uses in unevaluated operands or for classes that do 6835 // not have a vtable. 6836 if (!Class->isDynamicClass() || Class->isDependentContext() || 6837 CurContext->isDependentContext() || 6838 ExprEvalContexts.back().Context == Unevaluated) 6839 return; 6840 6841 // Try to insert this class into the map. 6842 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6843 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6844 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6845 if (!Pos.second) { 6846 // If we already had an entry, check to see if we are promoting this vtable 6847 // to required a definition. If so, we need to reappend to the VTableUses 6848 // list, since we may have already processed the first entry. 6849 if (DefinitionRequired && !Pos.first->second) { 6850 Pos.first->second = true; 6851 } else { 6852 // Otherwise, we can early exit. 6853 return; 6854 } 6855 } 6856 6857 // Local classes need to have their virtual members marked 6858 // immediately. For all other classes, we mark their virtual members 6859 // at the end of the translation unit. 6860 if (Class->isLocalClass()) 6861 MarkVirtualMembersReferenced(Loc, Class); 6862 else 6863 VTableUses.push_back(std::make_pair(Class, Loc)); 6864} 6865 6866bool Sema::DefineUsedVTables() { 6867 // If any dynamic classes have their key function defined within 6868 // this translation unit, then those vtables are considered "used" and must 6869 // be emitted. 6870 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6871 if (const CXXMethodDecl *KeyFunction 6872 = Context.getKeyFunction(DynamicClasses[I])) { 6873 const FunctionDecl *Definition = 0; 6874 if (KeyFunction->hasBody(Definition)) 6875 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6876 } 6877 } 6878 6879 if (VTableUses.empty()) 6880 return false; 6881 6882 // Note: The VTableUses vector could grow as a result of marking 6883 // the members of a class as "used", so we check the size each 6884 // time through the loop and prefer indices (with are stable) to 6885 // iterators (which are not). 6886 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6887 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6888 if (!Class) 6889 continue; 6890 6891 SourceLocation Loc = VTableUses[I].second; 6892 6893 // If this class has a key function, but that key function is 6894 // defined in another translation unit, we don't need to emit the 6895 // vtable even though we're using it. 6896 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6897 if (KeyFunction && !KeyFunction->hasBody()) { 6898 switch (KeyFunction->getTemplateSpecializationKind()) { 6899 case TSK_Undeclared: 6900 case TSK_ExplicitSpecialization: 6901 case TSK_ExplicitInstantiationDeclaration: 6902 // The key function is in another translation unit. 6903 continue; 6904 6905 case TSK_ExplicitInstantiationDefinition: 6906 case TSK_ImplicitInstantiation: 6907 // We will be instantiating the key function. 6908 break; 6909 } 6910 } else if (!KeyFunction) { 6911 // If we have a class with no key function that is the subject 6912 // of an explicit instantiation declaration, suppress the 6913 // vtable; it will live with the explicit instantiation 6914 // definition. 6915 bool IsExplicitInstantiationDeclaration 6916 = Class->getTemplateSpecializationKind() 6917 == TSK_ExplicitInstantiationDeclaration; 6918 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6919 REnd = Class->redecls_end(); 6920 R != REnd; ++R) { 6921 TemplateSpecializationKind TSK 6922 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6923 if (TSK == TSK_ExplicitInstantiationDeclaration) 6924 IsExplicitInstantiationDeclaration = true; 6925 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6926 IsExplicitInstantiationDeclaration = false; 6927 break; 6928 } 6929 } 6930 6931 if (IsExplicitInstantiationDeclaration) 6932 continue; 6933 } 6934 6935 // Mark all of the virtual members of this class as referenced, so 6936 // that we can build a vtable. Then, tell the AST consumer that a 6937 // vtable for this class is required. 6938 MarkVirtualMembersReferenced(Loc, Class); 6939 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6940 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6941 6942 // Optionally warn if we're emitting a weak vtable. 6943 if (Class->getLinkage() == ExternalLinkage && 6944 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6945 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6946 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6947 } 6948 } 6949 VTableUses.clear(); 6950 6951 return true; 6952} 6953 6954void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6955 const CXXRecordDecl *RD) { 6956 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6957 e = RD->method_end(); i != e; ++i) { 6958 CXXMethodDecl *MD = *i; 6959 6960 // C++ [basic.def.odr]p2: 6961 // [...] A virtual member function is used if it is not pure. [...] 6962 if (MD->isVirtual() && !MD->isPure()) 6963 MarkDeclarationReferenced(Loc, MD); 6964 } 6965 6966 // Only classes that have virtual bases need a VTT. 6967 if (RD->getNumVBases() == 0) 6968 return; 6969 6970 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6971 e = RD->bases_end(); i != e; ++i) { 6972 const CXXRecordDecl *Base = 6973 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6974 if (Base->getNumVBases() == 0) 6975 continue; 6976 MarkVirtualMembersReferenced(Loc, Base); 6977 } 6978} 6979 6980/// SetIvarInitializers - This routine builds initialization ASTs for the 6981/// Objective-C implementation whose ivars need be initialized. 6982void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6983 if (!getLangOptions().CPlusPlus) 6984 return; 6985 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6986 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6987 CollectIvarsToConstructOrDestruct(OID, ivars); 6988 if (ivars.empty()) 6989 return; 6990 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6991 for (unsigned i = 0; i < ivars.size(); i++) { 6992 FieldDecl *Field = ivars[i]; 6993 if (Field->isInvalidDecl()) 6994 continue; 6995 6996 CXXBaseOrMemberInitializer *Member; 6997 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6998 InitializationKind InitKind = 6999 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7000 7001 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7002 ExprResult MemberInit = 7003 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7004 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 7005 // Note, MemberInit could actually come back empty if no initialization 7006 // is required (e.g., because it would call a trivial default constructor) 7007 if (!MemberInit.get() || MemberInit.isInvalid()) 7008 continue; 7009 7010 Member = 7011 new (Context) CXXBaseOrMemberInitializer(Context, 7012 Field, SourceLocation(), 7013 SourceLocation(), 7014 MemberInit.takeAs<Expr>(), 7015 SourceLocation()); 7016 AllToInit.push_back(Member); 7017 7018 // Be sure that the destructor is accessible and is marked as referenced. 7019 if (const RecordType *RecordTy 7020 = Context.getBaseElementType(Field->getType()) 7021 ->getAs<RecordType>()) { 7022 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7023 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7024 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7025 CheckDestructorAccess(Field->getLocation(), Destructor, 7026 PDiag(diag::err_access_dtor_ivar) 7027 << Context.getBaseElementType(Field->getType())); 7028 } 7029 } 7030 } 7031 ObjCImplementation->setIvarInitializers(Context, 7032 AllToInit.data(), AllToInit.size()); 7033 } 7034} 7035