SemaDeclCXX.cpp revision 9b7d6701dabc24387cc152e4d13bf9aec6aa461a
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/Sema.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 Param->setDefaultArg(0); 416 } 417 } 418 } 419} 420 421/// isCurrentClassName - Determine whether the identifier II is the 422/// name of the class type currently being defined. In the case of 423/// nested classes, this will only return true if II is the name of 424/// the innermost class. 425bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 426 const CXXScopeSpec *SS) { 427 assert(getLangOptions().CPlusPlus && "No class names in C!"); 428 429 CXXRecordDecl *CurDecl; 430 if (SS && SS->isSet() && !SS->isInvalid()) { 431 DeclContext *DC = computeDeclContext(*SS, true); 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 433 } else 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 435 436 if (CurDecl && CurDecl->getIdentifier()) 437 return &II == CurDecl->getIdentifier(); 438 else 439 return false; 440} 441 442/// \brief Check the validity of a C++ base class specifier. 443/// 444/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 445/// and returns NULL otherwise. 446CXXBaseSpecifier * 447Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 448 SourceRange SpecifierRange, 449 bool Virtual, AccessSpecifier Access, 450 TypeSourceInfo *TInfo) { 451 QualType BaseType = TInfo->getType(); 452 453 // C++ [class.union]p1: 454 // A union shall not have base classes. 455 if (Class->isUnion()) { 456 Diag(Class->getLocation(), diag::err_base_clause_on_union) 457 << SpecifierRange; 458 return 0; 459 } 460 461 if (BaseType->isDependentType()) 462 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 463 Class->getTagKind() == TTK_Class, 464 Access, TInfo); 465 466 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 467 468 // Base specifiers must be record types. 469 if (!BaseType->isRecordType()) { 470 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 471 return 0; 472 } 473 474 // C++ [class.union]p1: 475 // A union shall not be used as a base class. 476 if (BaseType->isUnionType()) { 477 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 478 return 0; 479 } 480 481 // C++ [class.derived]p2: 482 // The class-name in a base-specifier shall not be an incompletely 483 // defined class. 484 if (RequireCompleteType(BaseLoc, BaseType, 485 PDiag(diag::err_incomplete_base_class) 486 << SpecifierRange)) { 487 Class->setInvalidDecl(); 488 return 0; 489 } 490 491 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 492 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 493 assert(BaseDecl && "Record type has no declaration"); 494 BaseDecl = BaseDecl->getDefinition(); 495 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 496 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 497 assert(CXXBaseDecl && "Base type is not a C++ type"); 498 499 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 500 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 501 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 502 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 503 << BaseType; 504 return 0; 505 } 506 507 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 508 509 if (BaseDecl->isInvalidDecl()) 510 Class->setInvalidDecl(); 511 512 // Create the base specifier. 513 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 514 Class->getTagKind() == TTK_Class, 515 Access, TInfo); 516} 517 518void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 519 const CXXRecordDecl *BaseClass, 520 bool BaseIsVirtual) { 521 // A class with a non-empty base class is not empty. 522 // FIXME: Standard ref? 523 if (!BaseClass->isEmpty()) 524 Class->setEmpty(false); 525 526 // C++ [class.virtual]p1: 527 // A class that [...] inherits a virtual function is called a polymorphic 528 // class. 529 if (BaseClass->isPolymorphic()) 530 Class->setPolymorphic(true); 531 532 // C++ [dcl.init.aggr]p1: 533 // An aggregate is [...] a class with [...] no base classes [...]. 534 Class->setAggregate(false); 535 536 // C++ [class]p4: 537 // A POD-struct is an aggregate class... 538 Class->setPOD(false); 539 540 if (BaseIsVirtual) { 541 // C++ [class.ctor]p5: 542 // A constructor is trivial if its class has no virtual base classes. 543 Class->setHasTrivialConstructor(false); 544 545 // C++ [class.copy]p6: 546 // A copy constructor is trivial if its class has no virtual base classes. 547 Class->setHasTrivialCopyConstructor(false); 548 549 // C++ [class.copy]p11: 550 // A copy assignment operator is trivial if its class has no virtual 551 // base classes. 552 Class->setHasTrivialCopyAssignment(false); 553 554 // C++0x [meta.unary.prop] is_empty: 555 // T is a class type, but not a union type, with ... no virtual base 556 // classes 557 Class->setEmpty(false); 558 } else { 559 // C++ [class.ctor]p5: 560 // A constructor is trivial if all the direct base classes of its 561 // class have trivial constructors. 562 if (!BaseClass->hasTrivialConstructor()) 563 Class->setHasTrivialConstructor(false); 564 565 // C++ [class.copy]p6: 566 // A copy constructor is trivial if all the direct base classes of its 567 // class have trivial copy constructors. 568 if (!BaseClass->hasTrivialCopyConstructor()) 569 Class->setHasTrivialCopyConstructor(false); 570 571 // C++ [class.copy]p11: 572 // A copy assignment operator is trivial if all the direct base classes 573 // of its class have trivial copy assignment operators. 574 if (!BaseClass->hasTrivialCopyAssignment()) 575 Class->setHasTrivialCopyAssignment(false); 576 } 577 578 // C++ [class.ctor]p3: 579 // A destructor is trivial if all the direct base classes of its class 580 // have trivial destructors. 581 if (!BaseClass->hasTrivialDestructor()) 582 Class->setHasTrivialDestructor(false); 583} 584 585/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 586/// one entry in the base class list of a class specifier, for 587/// example: 588/// class foo : public bar, virtual private baz { 589/// 'public bar' and 'virtual private baz' are each base-specifiers. 590Sema::BaseResult 591Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 592 bool Virtual, AccessSpecifier Access, 593 TypeTy *basetype, SourceLocation BaseLoc) { 594 if (!classdecl) 595 return true; 596 597 AdjustDeclIfTemplate(classdecl); 598 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 599 if (!Class) 600 return true; 601 602 TypeSourceInfo *TInfo = 0; 603 GetTypeFromParser(basetype, &TInfo); 604 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 605 Virtual, Access, TInfo)) 606 return BaseSpec; 607 608 return true; 609} 610 611/// \brief Performs the actual work of attaching the given base class 612/// specifiers to a C++ class. 613bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 614 unsigned NumBases) { 615 if (NumBases == 0) 616 return false; 617 618 // Used to keep track of which base types we have already seen, so 619 // that we can properly diagnose redundant direct base types. Note 620 // that the key is always the unqualified canonical type of the base 621 // class. 622 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 623 624 // Copy non-redundant base specifiers into permanent storage. 625 unsigned NumGoodBases = 0; 626 bool Invalid = false; 627 for (unsigned idx = 0; idx < NumBases; ++idx) { 628 QualType NewBaseType 629 = Context.getCanonicalType(Bases[idx]->getType()); 630 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 631 if (!Class->hasObjectMember()) { 632 if (const RecordType *FDTTy = 633 NewBaseType.getTypePtr()->getAs<RecordType>()) 634 if (FDTTy->getDecl()->hasObjectMember()) 635 Class->setHasObjectMember(true); 636 } 637 638 if (KnownBaseTypes[NewBaseType]) { 639 // C++ [class.mi]p3: 640 // A class shall not be specified as a direct base class of a 641 // derived class more than once. 642 Diag(Bases[idx]->getSourceRange().getBegin(), 643 diag::err_duplicate_base_class) 644 << KnownBaseTypes[NewBaseType]->getType() 645 << Bases[idx]->getSourceRange(); 646 647 // Delete the duplicate base class specifier; we're going to 648 // overwrite its pointer later. 649 Context.Deallocate(Bases[idx]); 650 651 Invalid = true; 652 } else { 653 // Okay, add this new base class. 654 KnownBaseTypes[NewBaseType] = Bases[idx]; 655 Bases[NumGoodBases++] = Bases[idx]; 656 } 657 } 658 659 // Attach the remaining base class specifiers to the derived class. 660 Class->setBases(Bases, NumGoodBases); 661 662 // Delete the remaining (good) base class specifiers, since their 663 // data has been copied into the CXXRecordDecl. 664 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 665 Context.Deallocate(Bases[idx]); 666 667 return Invalid; 668} 669 670/// ActOnBaseSpecifiers - Attach the given base specifiers to the 671/// class, after checking whether there are any duplicate base 672/// classes. 673void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 674 unsigned NumBases) { 675 if (!ClassDecl || !Bases || !NumBases) 676 return; 677 678 AdjustDeclIfTemplate(ClassDecl); 679 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 680 (CXXBaseSpecifier**)(Bases), NumBases); 681} 682 683static CXXRecordDecl *GetClassForType(QualType T) { 684 if (const RecordType *RT = T->getAs<RecordType>()) 685 return cast<CXXRecordDecl>(RT->getDecl()); 686 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 687 return ICT->getDecl(); 688 else 689 return 0; 690} 691 692/// \brief Determine whether the type \p Derived is a C++ class that is 693/// derived from the type \p Base. 694bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 695 if (!getLangOptions().CPlusPlus) 696 return false; 697 698 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 699 if (!DerivedRD) 700 return false; 701 702 CXXRecordDecl *BaseRD = GetClassForType(Base); 703 if (!BaseRD) 704 return false; 705 706 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 707 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 708} 709 710/// \brief Determine whether the type \p Derived is a C++ class that is 711/// derived from the type \p Base. 712bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 713 if (!getLangOptions().CPlusPlus) 714 return false; 715 716 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 717 if (!DerivedRD) 718 return false; 719 720 CXXRecordDecl *BaseRD = GetClassForType(Base); 721 if (!BaseRD) 722 return false; 723 724 return DerivedRD->isDerivedFrom(BaseRD, Paths); 725} 726 727void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 728 CXXCastPath &BasePathArray) { 729 assert(BasePathArray.empty() && "Base path array must be empty!"); 730 assert(Paths.isRecordingPaths() && "Must record paths!"); 731 732 const CXXBasePath &Path = Paths.front(); 733 734 // We first go backward and check if we have a virtual base. 735 // FIXME: It would be better if CXXBasePath had the base specifier for 736 // the nearest virtual base. 737 unsigned Start = 0; 738 for (unsigned I = Path.size(); I != 0; --I) { 739 if (Path[I - 1].Base->isVirtual()) { 740 Start = I - 1; 741 break; 742 } 743 } 744 745 // Now add all bases. 746 for (unsigned I = Start, E = Path.size(); I != E; ++I) 747 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 748} 749 750/// \brief Determine whether the given base path includes a virtual 751/// base class. 752bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 753 for (CXXCastPath::const_iterator B = BasePath.begin(), 754 BEnd = BasePath.end(); 755 B != BEnd; ++B) 756 if ((*B)->isVirtual()) 757 return true; 758 759 return false; 760} 761 762/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 763/// conversion (where Derived and Base are class types) is 764/// well-formed, meaning that the conversion is unambiguous (and 765/// that all of the base classes are accessible). Returns true 766/// and emits a diagnostic if the code is ill-formed, returns false 767/// otherwise. Loc is the location where this routine should point to 768/// if there is an error, and Range is the source range to highlight 769/// if there is an error. 770bool 771Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 772 unsigned InaccessibleBaseID, 773 unsigned AmbigiousBaseConvID, 774 SourceLocation Loc, SourceRange Range, 775 DeclarationName Name, 776 CXXCastPath *BasePath) { 777 // First, determine whether the path from Derived to Base is 778 // ambiguous. This is slightly more expensive than checking whether 779 // the Derived to Base conversion exists, because here we need to 780 // explore multiple paths to determine if there is an ambiguity. 781 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 782 /*DetectVirtual=*/false); 783 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 784 assert(DerivationOkay && 785 "Can only be used with a derived-to-base conversion"); 786 (void)DerivationOkay; 787 788 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 789 if (InaccessibleBaseID) { 790 // Check that the base class can be accessed. 791 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 792 InaccessibleBaseID)) { 793 case AR_inaccessible: 794 return true; 795 case AR_accessible: 796 case AR_dependent: 797 case AR_delayed: 798 break; 799 } 800 } 801 802 // Build a base path if necessary. 803 if (BasePath) 804 BuildBasePathArray(Paths, *BasePath); 805 return false; 806 } 807 808 // We know that the derived-to-base conversion is ambiguous, and 809 // we're going to produce a diagnostic. Perform the derived-to-base 810 // search just one more time to compute all of the possible paths so 811 // that we can print them out. This is more expensive than any of 812 // the previous derived-to-base checks we've done, but at this point 813 // performance isn't as much of an issue. 814 Paths.clear(); 815 Paths.setRecordingPaths(true); 816 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 817 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 818 (void)StillOkay; 819 820 // Build up a textual representation of the ambiguous paths, e.g., 821 // D -> B -> A, that will be used to illustrate the ambiguous 822 // conversions in the diagnostic. We only print one of the paths 823 // to each base class subobject. 824 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 825 826 Diag(Loc, AmbigiousBaseConvID) 827 << Derived << Base << PathDisplayStr << Range << Name; 828 return true; 829} 830 831bool 832Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 833 SourceLocation Loc, SourceRange Range, 834 CXXCastPath *BasePath, 835 bool IgnoreAccess) { 836 return CheckDerivedToBaseConversion(Derived, Base, 837 IgnoreAccess ? 0 838 : diag::err_upcast_to_inaccessible_base, 839 diag::err_ambiguous_derived_to_base_conv, 840 Loc, Range, DeclarationName(), 841 BasePath); 842} 843 844 845/// @brief Builds a string representing ambiguous paths from a 846/// specific derived class to different subobjects of the same base 847/// class. 848/// 849/// This function builds a string that can be used in error messages 850/// to show the different paths that one can take through the 851/// inheritance hierarchy to go from the derived class to different 852/// subobjects of a base class. The result looks something like this: 853/// @code 854/// struct D -> struct B -> struct A 855/// struct D -> struct C -> struct A 856/// @endcode 857std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 858 std::string PathDisplayStr; 859 std::set<unsigned> DisplayedPaths; 860 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 861 Path != Paths.end(); ++Path) { 862 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 863 // We haven't displayed a path to this particular base 864 // class subobject yet. 865 PathDisplayStr += "\n "; 866 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 867 for (CXXBasePath::const_iterator Element = Path->begin(); 868 Element != Path->end(); ++Element) 869 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 870 } 871 } 872 873 return PathDisplayStr; 874} 875 876//===----------------------------------------------------------------------===// 877// C++ class member Handling 878//===----------------------------------------------------------------------===// 879 880/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 881Sema::DeclPtrTy 882Sema::ActOnAccessSpecifier(AccessSpecifier Access, 883 SourceLocation ASLoc, SourceLocation ColonLoc) { 884 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 885 AccessSpecDecl* ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 886 ASLoc, ColonLoc); 887 CurContext->addHiddenDecl(ASDecl); 888 return DeclPtrTy::make(ASDecl); 889} 890 891/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 892/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 893/// bitfield width if there is one and 'InitExpr' specifies the initializer if 894/// any. 895Sema::DeclPtrTy 896Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 897 MultiTemplateParamsArg TemplateParameterLists, 898 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 899 bool Deleted) { 900 const DeclSpec &DS = D.getDeclSpec(); 901 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 902 DeclarationName Name = NameInfo.getName(); 903 SourceLocation Loc = NameInfo.getLoc(); 904 Expr *BitWidth = static_cast<Expr*>(BW); 905 Expr *Init = static_cast<Expr*>(InitExpr); 906 907 assert(isa<CXXRecordDecl>(CurContext)); 908 assert(!DS.isFriendSpecified()); 909 910 bool isFunc = false; 911 if (D.isFunctionDeclarator()) 912 isFunc = true; 913 else if (D.getNumTypeObjects() == 0 && 914 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 915 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 916 isFunc = TDType->isFunctionType(); 917 } 918 919 // C++ 9.2p6: A member shall not be declared to have automatic storage 920 // duration (auto, register) or with the extern storage-class-specifier. 921 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 922 // data members and cannot be applied to names declared const or static, 923 // and cannot be applied to reference members. 924 switch (DS.getStorageClassSpec()) { 925 case DeclSpec::SCS_unspecified: 926 case DeclSpec::SCS_typedef: 927 case DeclSpec::SCS_static: 928 // FALL THROUGH. 929 break; 930 case DeclSpec::SCS_mutable: 931 if (isFunc) { 932 if (DS.getStorageClassSpecLoc().isValid()) 933 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 934 else 935 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 936 937 // FIXME: It would be nicer if the keyword was ignored only for this 938 // declarator. Otherwise we could get follow-up errors. 939 D.getMutableDeclSpec().ClearStorageClassSpecs(); 940 } 941 break; 942 default: 943 if (DS.getStorageClassSpecLoc().isValid()) 944 Diag(DS.getStorageClassSpecLoc(), 945 diag::err_storageclass_invalid_for_member); 946 else 947 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 948 D.getMutableDeclSpec().ClearStorageClassSpecs(); 949 } 950 951 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 952 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 953 !isFunc); 954 955 Decl *Member; 956 if (isInstField) { 957 // FIXME: Check for template parameters! 958 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 959 AS); 960 assert(Member && "HandleField never returns null"); 961 } else { 962 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 963 .getAs<Decl>(); 964 if (!Member) { 965 if (BitWidth) DeleteExpr(BitWidth); 966 return DeclPtrTy(); 967 } 968 969 // Non-instance-fields can't have a bitfield. 970 if (BitWidth) { 971 if (Member->isInvalidDecl()) { 972 // don't emit another diagnostic. 973 } else if (isa<VarDecl>(Member)) { 974 // C++ 9.6p3: A bit-field shall not be a static member. 975 // "static member 'A' cannot be a bit-field" 976 Diag(Loc, diag::err_static_not_bitfield) 977 << Name << BitWidth->getSourceRange(); 978 } else if (isa<TypedefDecl>(Member)) { 979 // "typedef member 'x' cannot be a bit-field" 980 Diag(Loc, diag::err_typedef_not_bitfield) 981 << Name << BitWidth->getSourceRange(); 982 } else { 983 // A function typedef ("typedef int f(); f a;"). 984 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 985 Diag(Loc, diag::err_not_integral_type_bitfield) 986 << Name << cast<ValueDecl>(Member)->getType() 987 << BitWidth->getSourceRange(); 988 } 989 990 DeleteExpr(BitWidth); 991 BitWidth = 0; 992 Member->setInvalidDecl(); 993 } 994 995 Member->setAccess(AS); 996 997 // If we have declared a member function template, set the access of the 998 // templated declaration as well. 999 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1000 FunTmpl->getTemplatedDecl()->setAccess(AS); 1001 } 1002 1003 assert((Name || isInstField) && "No identifier for non-field ?"); 1004 1005 if (Init) 1006 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1007 if (Deleted) // FIXME: Source location is not very good. 1008 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1009 1010 if (isInstField) { 1011 FieldCollector->Add(cast<FieldDecl>(Member)); 1012 return DeclPtrTy(); 1013 } 1014 return DeclPtrTy::make(Member); 1015} 1016 1017/// \brief Find the direct and/or virtual base specifiers that 1018/// correspond to the given base type, for use in base initialization 1019/// within a constructor. 1020static bool FindBaseInitializer(Sema &SemaRef, 1021 CXXRecordDecl *ClassDecl, 1022 QualType BaseType, 1023 const CXXBaseSpecifier *&DirectBaseSpec, 1024 const CXXBaseSpecifier *&VirtualBaseSpec) { 1025 // First, check for a direct base class. 1026 DirectBaseSpec = 0; 1027 for (CXXRecordDecl::base_class_const_iterator Base 1028 = ClassDecl->bases_begin(); 1029 Base != ClassDecl->bases_end(); ++Base) { 1030 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1031 // We found a direct base of this type. That's what we're 1032 // initializing. 1033 DirectBaseSpec = &*Base; 1034 break; 1035 } 1036 } 1037 1038 // Check for a virtual base class. 1039 // FIXME: We might be able to short-circuit this if we know in advance that 1040 // there are no virtual bases. 1041 VirtualBaseSpec = 0; 1042 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1043 // We haven't found a base yet; search the class hierarchy for a 1044 // virtual base class. 1045 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1046 /*DetectVirtual=*/false); 1047 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1048 BaseType, Paths)) { 1049 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1050 Path != Paths.end(); ++Path) { 1051 if (Path->back().Base->isVirtual()) { 1052 VirtualBaseSpec = Path->back().Base; 1053 break; 1054 } 1055 } 1056 } 1057 } 1058 1059 return DirectBaseSpec || VirtualBaseSpec; 1060} 1061 1062/// ActOnMemInitializer - Handle a C++ member initializer. 1063Sema::MemInitResult 1064Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1065 Scope *S, 1066 CXXScopeSpec &SS, 1067 IdentifierInfo *MemberOrBase, 1068 TypeTy *TemplateTypeTy, 1069 SourceLocation IdLoc, 1070 SourceLocation LParenLoc, 1071 ExprTy **Args, unsigned NumArgs, 1072 SourceLocation *CommaLocs, 1073 SourceLocation RParenLoc) { 1074 if (!ConstructorD) 1075 return true; 1076 1077 AdjustDeclIfTemplate(ConstructorD); 1078 1079 CXXConstructorDecl *Constructor 1080 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1081 if (!Constructor) { 1082 // The user wrote a constructor initializer on a function that is 1083 // not a C++ constructor. Ignore the error for now, because we may 1084 // have more member initializers coming; we'll diagnose it just 1085 // once in ActOnMemInitializers. 1086 return true; 1087 } 1088 1089 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1090 1091 // C++ [class.base.init]p2: 1092 // Names in a mem-initializer-id are looked up in the scope of the 1093 // constructor’s class and, if not found in that scope, are looked 1094 // up in the scope containing the constructor’s 1095 // definition. [Note: if the constructor’s class contains a member 1096 // with the same name as a direct or virtual base class of the 1097 // class, a mem-initializer-id naming the member or base class and 1098 // composed of a single identifier refers to the class member. A 1099 // mem-initializer-id for the hidden base class may be specified 1100 // using a qualified name. ] 1101 if (!SS.getScopeRep() && !TemplateTypeTy) { 1102 // Look for a member, first. 1103 FieldDecl *Member = 0; 1104 DeclContext::lookup_result Result 1105 = ClassDecl->lookup(MemberOrBase); 1106 if (Result.first != Result.second) 1107 Member = dyn_cast<FieldDecl>(*Result.first); 1108 1109 // FIXME: Handle members of an anonymous union. 1110 1111 if (Member) 1112 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1113 LParenLoc, RParenLoc); 1114 } 1115 // It didn't name a member, so see if it names a class. 1116 QualType BaseType; 1117 TypeSourceInfo *TInfo = 0; 1118 1119 if (TemplateTypeTy) { 1120 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1121 } else { 1122 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1123 LookupParsedName(R, S, &SS); 1124 1125 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1126 if (!TyD) { 1127 if (R.isAmbiguous()) return true; 1128 1129 // We don't want access-control diagnostics here. 1130 R.suppressDiagnostics(); 1131 1132 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1133 bool NotUnknownSpecialization = false; 1134 DeclContext *DC = computeDeclContext(SS, false); 1135 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1136 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1137 1138 if (!NotUnknownSpecialization) { 1139 // When the scope specifier can refer to a member of an unknown 1140 // specialization, we take it as a type name. 1141 BaseType = CheckTypenameType(ETK_None, 1142 (NestedNameSpecifier *)SS.getScopeRep(), 1143 *MemberOrBase, SourceLocation(), 1144 SS.getRange(), IdLoc); 1145 if (BaseType.isNull()) 1146 return true; 1147 1148 R.clear(); 1149 R.setLookupName(MemberOrBase); 1150 } 1151 } 1152 1153 // If no results were found, try to correct typos. 1154 if (R.empty() && BaseType.isNull() && 1155 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1156 R.isSingleResult()) { 1157 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1158 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1159 // We have found a non-static data member with a similar 1160 // name to what was typed; complain and initialize that 1161 // member. 1162 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1163 << MemberOrBase << true << R.getLookupName() 1164 << FixItHint::CreateReplacement(R.getNameLoc(), 1165 R.getLookupName().getAsString()); 1166 Diag(Member->getLocation(), diag::note_previous_decl) 1167 << Member->getDeclName(); 1168 1169 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1170 LParenLoc, RParenLoc); 1171 } 1172 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1173 const CXXBaseSpecifier *DirectBaseSpec; 1174 const CXXBaseSpecifier *VirtualBaseSpec; 1175 if (FindBaseInitializer(*this, ClassDecl, 1176 Context.getTypeDeclType(Type), 1177 DirectBaseSpec, VirtualBaseSpec)) { 1178 // We have found a direct or virtual base class with a 1179 // similar name to what was typed; complain and initialize 1180 // that base class. 1181 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1182 << MemberOrBase << false << R.getLookupName() 1183 << FixItHint::CreateReplacement(R.getNameLoc(), 1184 R.getLookupName().getAsString()); 1185 1186 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1187 : VirtualBaseSpec; 1188 Diag(BaseSpec->getSourceRange().getBegin(), 1189 diag::note_base_class_specified_here) 1190 << BaseSpec->getType() 1191 << BaseSpec->getSourceRange(); 1192 1193 TyD = Type; 1194 } 1195 } 1196 } 1197 1198 if (!TyD && BaseType.isNull()) { 1199 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1200 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1201 return true; 1202 } 1203 } 1204 1205 if (BaseType.isNull()) { 1206 BaseType = Context.getTypeDeclType(TyD); 1207 if (SS.isSet()) { 1208 NestedNameSpecifier *Qualifier = 1209 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1210 1211 // FIXME: preserve source range information 1212 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1213 } 1214 } 1215 } 1216 1217 if (!TInfo) 1218 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1219 1220 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1221 LParenLoc, RParenLoc, ClassDecl); 1222} 1223 1224/// Checks an initializer expression for use of uninitialized fields, such as 1225/// containing the field that is being initialized. Returns true if there is an 1226/// uninitialized field was used an updates the SourceLocation parameter; false 1227/// otherwise. 1228static bool InitExprContainsUninitializedFields(const Stmt *S, 1229 const FieldDecl *LhsField, 1230 SourceLocation *L) { 1231 if (isa<CallExpr>(S)) { 1232 // Do not descend into function calls or constructors, as the use 1233 // of an uninitialized field may be valid. One would have to inspect 1234 // the contents of the function/ctor to determine if it is safe or not. 1235 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1236 // may be safe, depending on what the function/ctor does. 1237 return false; 1238 } 1239 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1240 const NamedDecl *RhsField = ME->getMemberDecl(); 1241 if (RhsField == LhsField) { 1242 // Initializing a field with itself. Throw a warning. 1243 // But wait; there are exceptions! 1244 // Exception #1: The field may not belong to this record. 1245 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1246 const Expr *base = ME->getBase(); 1247 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1248 // Even though the field matches, it does not belong to this record. 1249 return false; 1250 } 1251 // None of the exceptions triggered; return true to indicate an 1252 // uninitialized field was used. 1253 *L = ME->getMemberLoc(); 1254 return true; 1255 } 1256 } 1257 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1258 it != e; ++it) { 1259 if (!*it) { 1260 // An expression such as 'member(arg ?: "")' may trigger this. 1261 continue; 1262 } 1263 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1264 return true; 1265 } 1266 return false; 1267} 1268 1269Sema::MemInitResult 1270Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1271 unsigned NumArgs, SourceLocation IdLoc, 1272 SourceLocation LParenLoc, 1273 SourceLocation RParenLoc) { 1274 // Diagnose value-uses of fields to initialize themselves, e.g. 1275 // foo(foo) 1276 // where foo is not also a parameter to the constructor. 1277 // TODO: implement -Wuninitialized and fold this into that framework. 1278 for (unsigned i = 0; i < NumArgs; ++i) { 1279 SourceLocation L; 1280 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1281 // FIXME: Return true in the case when other fields are used before being 1282 // uninitialized. For example, let this field be the i'th field. When 1283 // initializing the i'th field, throw a warning if any of the >= i'th 1284 // fields are used, as they are not yet initialized. 1285 // Right now we are only handling the case where the i'th field uses 1286 // itself in its initializer. 1287 Diag(L, diag::warn_field_is_uninit); 1288 } 1289 } 1290 1291 bool HasDependentArg = false; 1292 for (unsigned i = 0; i < NumArgs; i++) 1293 HasDependentArg |= Args[i]->isTypeDependent(); 1294 1295 if (Member->getType()->isDependentType() || HasDependentArg) { 1296 // Can't check initialization for a member of dependent type or when 1297 // any of the arguments are type-dependent expressions. 1298 OwningExprResult Init 1299 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1300 RParenLoc)); 1301 1302 // Erase any temporaries within this evaluation context; we're not 1303 // going to track them in the AST, since we'll be rebuilding the 1304 // ASTs during template instantiation. 1305 ExprTemporaries.erase( 1306 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1307 ExprTemporaries.end()); 1308 1309 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1310 LParenLoc, 1311 Init.takeAs<Expr>(), 1312 RParenLoc); 1313 1314 } 1315 1316 if (Member->isInvalidDecl()) 1317 return true; 1318 1319 // Initialize the member. 1320 InitializedEntity MemberEntity = 1321 InitializedEntity::InitializeMember(Member, 0); 1322 InitializationKind Kind = 1323 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1324 1325 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1326 1327 OwningExprResult MemberInit = 1328 InitSeq.Perform(*this, MemberEntity, Kind, 1329 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1330 if (MemberInit.isInvalid()) 1331 return true; 1332 1333 // C++0x [class.base.init]p7: 1334 // The initialization of each base and member constitutes a 1335 // full-expression. 1336 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1337 if (MemberInit.isInvalid()) 1338 return true; 1339 1340 // If we are in a dependent context, template instantiation will 1341 // perform this type-checking again. Just save the arguments that we 1342 // received in a ParenListExpr. 1343 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1344 // of the information that we have about the member 1345 // initializer. However, deconstructing the ASTs is a dicey process, 1346 // and this approach is far more likely to get the corner cases right. 1347 if (CurContext->isDependentContext()) { 1348 // Bump the reference count of all of the arguments. 1349 for (unsigned I = 0; I != NumArgs; ++I) 1350 Args[I]->Retain(); 1351 1352 OwningExprResult Init 1353 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1354 RParenLoc)); 1355 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1356 LParenLoc, 1357 Init.takeAs<Expr>(), 1358 RParenLoc); 1359 } 1360 1361 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1362 LParenLoc, 1363 MemberInit.takeAs<Expr>(), 1364 RParenLoc); 1365} 1366 1367Sema::MemInitResult 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 OwningExprResult 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 OwningExprResult BaseInit = 1460 InitSeq.Perform(*this, BaseEntity, Kind, 1461 MultiExprArg(*this, (void**)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(move(BaseInit)); 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 OwningExprResult 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 Sema::OwningExprResult BaseInit(SemaRef); 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 Sema::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 CastExpr::CK_UncheckedDerivedToBase, 1548 ImplicitCastExpr::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 Sema::MultiExprArg(SemaRef, 1557 (void**)&CopyCtorArg, 1)); 1558 break; 1559 } 1560 1561 case IIK_Move: 1562 assert(false && "Unhandled initializer kind!"); 1563 } 1564 1565 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1566 if (BaseInit.isInvalid()) 1567 return true; 1568 1569 CXXBaseInit = 1570 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1571 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1572 SourceLocation()), 1573 BaseSpec->isVirtual(), 1574 SourceLocation(), 1575 BaseInit.takeAs<Expr>(), 1576 SourceLocation()); 1577 1578 return false; 1579} 1580 1581static bool 1582BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1583 ImplicitInitializerKind ImplicitInitKind, 1584 FieldDecl *Field, 1585 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1586 if (Field->isInvalidDecl()) 1587 return true; 1588 1589 SourceLocation Loc = Constructor->getLocation(); 1590 1591 if (ImplicitInitKind == IIK_Copy) { 1592 ParmVarDecl *Param = Constructor->getParamDecl(0); 1593 QualType ParamType = Param->getType().getNonReferenceType(); 1594 1595 Expr *MemberExprBase = 1596 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1597 Loc, ParamType, 0); 1598 1599 // Build a reference to this field within the parameter. 1600 CXXScopeSpec SS; 1601 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1602 Sema::LookupMemberName); 1603 MemberLookup.addDecl(Field, AS_public); 1604 MemberLookup.resolveKind(); 1605 Sema::OwningExprResult CopyCtorArg 1606 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1607 ParamType, Loc, 1608 /*IsArrow=*/false, 1609 SS, 1610 /*FirstQualifierInScope=*/0, 1611 MemberLookup, 1612 /*TemplateArgs=*/0); 1613 if (CopyCtorArg.isInvalid()) 1614 return true; 1615 1616 // When the field we are copying is an array, create index variables for 1617 // each dimension of the array. We use these index variables to subscript 1618 // the source array, and other clients (e.g., CodeGen) will perform the 1619 // necessary iteration with these index variables. 1620 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1621 QualType BaseType = Field->getType(); 1622 QualType SizeType = SemaRef.Context.getSizeType(); 1623 while (const ConstantArrayType *Array 1624 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1625 // Create the iteration variable for this array index. 1626 IdentifierInfo *IterationVarName = 0; 1627 { 1628 llvm::SmallString<8> Str; 1629 llvm::raw_svector_ostream OS(Str); 1630 OS << "__i" << IndexVariables.size(); 1631 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1632 } 1633 VarDecl *IterationVar 1634 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1635 IterationVarName, SizeType, 1636 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1637 VarDecl::None, VarDecl::None); 1638 IndexVariables.push_back(IterationVar); 1639 1640 // Create a reference to the iteration variable. 1641 Sema::OwningExprResult IterationVarRef 1642 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1643 assert(!IterationVarRef.isInvalid() && 1644 "Reference to invented variable cannot fail!"); 1645 1646 // Subscript the array with this iteration variable. 1647 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1648 Loc, 1649 move(IterationVarRef), 1650 Loc); 1651 if (CopyCtorArg.isInvalid()) 1652 return true; 1653 1654 BaseType = Array->getElementType(); 1655 } 1656 1657 // Construct the entity that we will be initializing. For an array, this 1658 // will be first element in the array, which may require several levels 1659 // of array-subscript entities. 1660 llvm::SmallVector<InitializedEntity, 4> Entities; 1661 Entities.reserve(1 + IndexVariables.size()); 1662 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1663 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1664 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1665 0, 1666 Entities.back())); 1667 1668 // Direct-initialize to use the copy constructor. 1669 InitializationKind InitKind = 1670 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1671 1672 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1673 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1674 &CopyCtorArgE, 1); 1675 1676 Sema::OwningExprResult MemberInit 1677 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1678 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1679 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1680 if (MemberInit.isInvalid()) 1681 return true; 1682 1683 CXXMemberInit 1684 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1685 MemberInit.takeAs<Expr>(), Loc, 1686 IndexVariables.data(), 1687 IndexVariables.size()); 1688 return false; 1689 } 1690 1691 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1692 1693 QualType FieldBaseElementType = 1694 SemaRef.Context.getBaseElementType(Field->getType()); 1695 1696 if (FieldBaseElementType->isRecordType()) { 1697 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1698 InitializationKind InitKind = 1699 InitializationKind::CreateDefault(Loc); 1700 1701 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1702 Sema::OwningExprResult MemberInit = 1703 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1704 Sema::MultiExprArg(SemaRef, 0, 0)); 1705 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1706 if (MemberInit.isInvalid()) 1707 return true; 1708 1709 CXXMemberInit = 1710 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1711 Field, Loc, Loc, 1712 MemberInit.takeAs<Expr>(), 1713 Loc); 1714 return false; 1715 } 1716 1717 if (FieldBaseElementType->isReferenceType()) { 1718 SemaRef.Diag(Constructor->getLocation(), 1719 diag::err_uninitialized_member_in_ctor) 1720 << (int)Constructor->isImplicit() 1721 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1722 << 0 << Field->getDeclName(); 1723 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1724 return true; 1725 } 1726 1727 if (FieldBaseElementType.isConstQualified()) { 1728 SemaRef.Diag(Constructor->getLocation(), 1729 diag::err_uninitialized_member_in_ctor) 1730 << (int)Constructor->isImplicit() 1731 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1732 << 1 << Field->getDeclName(); 1733 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1734 return true; 1735 } 1736 1737 // Nothing to initialize. 1738 CXXMemberInit = 0; 1739 return false; 1740} 1741 1742namespace { 1743struct BaseAndFieldInfo { 1744 Sema &S; 1745 CXXConstructorDecl *Ctor; 1746 bool AnyErrorsInInits; 1747 ImplicitInitializerKind IIK; 1748 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1749 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1750 1751 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1752 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1753 // FIXME: Handle implicit move constructors. 1754 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1755 IIK = IIK_Copy; 1756 else 1757 IIK = IIK_Default; 1758 } 1759}; 1760} 1761 1762static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1763 FieldDecl *Top, FieldDecl *Field, 1764 CXXBaseOrMemberInitializer *Init) { 1765 // If the member doesn't need to be initialized, Init will still be null. 1766 if (!Init) 1767 return; 1768 1769 Info.AllToInit.push_back(Init); 1770 if (Field != Top) { 1771 Init->setMember(Top); 1772 Init->setAnonUnionMember(Field); 1773 } 1774} 1775 1776static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1777 FieldDecl *Top, FieldDecl *Field) { 1778 1779 // Overwhelmingly common case: we have a direct initializer for this field. 1780 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1781 RecordFieldInitializer(Info, Top, Field, Init); 1782 return false; 1783 } 1784 1785 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1786 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1787 assert(FieldClassType && "anonymous struct/union without record type"); 1788 CXXRecordDecl *FieldClassDecl 1789 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1790 1791 // Even though union members never have non-trivial default 1792 // constructions in C++03, we still build member initializers for aggregate 1793 // record types which can be union members, and C++0x allows non-trivial 1794 // default constructors for union members, so we ensure that only one 1795 // member is initialized for these. 1796 if (FieldClassDecl->isUnion()) { 1797 // First check for an explicit initializer for one field. 1798 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1799 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1800 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1801 RecordFieldInitializer(Info, Top, *FA, Init); 1802 1803 // Once we've initialized a field of an anonymous union, the union 1804 // field in the class is also initialized, so exit immediately. 1805 return false; 1806 } else if ((*FA)->isAnonymousStructOrUnion()) { 1807 if (CollectFieldInitializer(Info, Top, *FA)) 1808 return true; 1809 } 1810 } 1811 1812 // Fallthrough and construct a default initializer for the union as 1813 // a whole, which can call its default constructor if such a thing exists 1814 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1815 // behavior going forward with C++0x, when anonymous unions there are 1816 // finalized, we should revisit this. 1817 } else { 1818 // For structs, we simply descend through to initialize all members where 1819 // necessary. 1820 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1821 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1822 if (CollectFieldInitializer(Info, Top, *FA)) 1823 return true; 1824 } 1825 } 1826 } 1827 1828 // Don't try to build an implicit initializer if there were semantic 1829 // errors in any of the initializers (and therefore we might be 1830 // missing some that the user actually wrote). 1831 if (Info.AnyErrorsInInits) 1832 return false; 1833 1834 CXXBaseOrMemberInitializer *Init = 0; 1835 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1836 return true; 1837 1838 RecordFieldInitializer(Info, Top, Field, Init); 1839 return false; 1840} 1841 1842bool 1843Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1844 CXXBaseOrMemberInitializer **Initializers, 1845 unsigned NumInitializers, 1846 bool AnyErrors) { 1847 if (Constructor->getDeclContext()->isDependentContext()) { 1848 // Just store the initializers as written, they will be checked during 1849 // instantiation. 1850 if (NumInitializers > 0) { 1851 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1852 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1853 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1854 memcpy(baseOrMemberInitializers, Initializers, 1855 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1856 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1857 } 1858 1859 return false; 1860 } 1861 1862 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1863 1864 // We need to build the initializer AST according to order of construction 1865 // and not what user specified in the Initializers list. 1866 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1867 if (!ClassDecl) 1868 return true; 1869 1870 bool HadError = false; 1871 1872 for (unsigned i = 0; i < NumInitializers; i++) { 1873 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1874 1875 if (Member->isBaseInitializer()) 1876 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1877 else 1878 Info.AllBaseFields[Member->getMember()] = Member; 1879 } 1880 1881 // Keep track of the direct virtual bases. 1882 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1883 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1884 E = ClassDecl->bases_end(); I != E; ++I) { 1885 if (I->isVirtual()) 1886 DirectVBases.insert(I); 1887 } 1888 1889 // Push virtual bases before others. 1890 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1891 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1892 1893 if (CXXBaseOrMemberInitializer *Value 1894 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1895 Info.AllToInit.push_back(Value); 1896 } else if (!AnyErrors) { 1897 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1898 CXXBaseOrMemberInitializer *CXXBaseInit; 1899 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1900 VBase, IsInheritedVirtualBase, 1901 CXXBaseInit)) { 1902 HadError = true; 1903 continue; 1904 } 1905 1906 Info.AllToInit.push_back(CXXBaseInit); 1907 } 1908 } 1909 1910 // Non-virtual bases. 1911 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1912 E = ClassDecl->bases_end(); Base != E; ++Base) { 1913 // Virtuals are in the virtual base list and already constructed. 1914 if (Base->isVirtual()) 1915 continue; 1916 1917 if (CXXBaseOrMemberInitializer *Value 1918 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1919 Info.AllToInit.push_back(Value); 1920 } else if (!AnyErrors) { 1921 CXXBaseOrMemberInitializer *CXXBaseInit; 1922 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1923 Base, /*IsInheritedVirtualBase=*/false, 1924 CXXBaseInit)) { 1925 HadError = true; 1926 continue; 1927 } 1928 1929 Info.AllToInit.push_back(CXXBaseInit); 1930 } 1931 } 1932 1933 // Fields. 1934 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1935 E = ClassDecl->field_end(); Field != E; ++Field) { 1936 if ((*Field)->getType()->isIncompleteArrayType()) { 1937 assert(ClassDecl->hasFlexibleArrayMember() && 1938 "Incomplete array type is not valid"); 1939 continue; 1940 } 1941 if (CollectFieldInitializer(Info, *Field, *Field)) 1942 HadError = true; 1943 } 1944 1945 NumInitializers = Info.AllToInit.size(); 1946 if (NumInitializers > 0) { 1947 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1948 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1949 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1950 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1951 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1952 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1953 1954 // Constructors implicitly reference the base and member 1955 // destructors. 1956 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1957 Constructor->getParent()); 1958 } 1959 1960 return HadError; 1961} 1962 1963static void *GetKeyForTopLevelField(FieldDecl *Field) { 1964 // For anonymous unions, use the class declaration as the key. 1965 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1966 if (RT->getDecl()->isAnonymousStructOrUnion()) 1967 return static_cast<void *>(RT->getDecl()); 1968 } 1969 return static_cast<void *>(Field); 1970} 1971 1972static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1973 return Context.getCanonicalType(BaseType).getTypePtr(); 1974} 1975 1976static void *GetKeyForMember(ASTContext &Context, 1977 CXXBaseOrMemberInitializer *Member, 1978 bool MemberMaybeAnon = false) { 1979 if (!Member->isMemberInitializer()) 1980 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1981 1982 // For fields injected into the class via declaration of an anonymous union, 1983 // use its anonymous union class declaration as the unique key. 1984 FieldDecl *Field = Member->getMember(); 1985 1986 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1987 // data member of the class. Data member used in the initializer list is 1988 // in AnonUnionMember field. 1989 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1990 Field = Member->getAnonUnionMember(); 1991 1992 // If the field is a member of an anonymous struct or union, our key 1993 // is the anonymous record decl that's a direct child of the class. 1994 RecordDecl *RD = Field->getParent(); 1995 if (RD->isAnonymousStructOrUnion()) { 1996 while (true) { 1997 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1998 if (Parent->isAnonymousStructOrUnion()) 1999 RD = Parent; 2000 else 2001 break; 2002 } 2003 2004 return static_cast<void *>(RD); 2005 } 2006 2007 return static_cast<void *>(Field); 2008} 2009 2010static void 2011DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2012 const CXXConstructorDecl *Constructor, 2013 CXXBaseOrMemberInitializer **Inits, 2014 unsigned NumInits) { 2015 if (Constructor->getDeclContext()->isDependentContext()) 2016 return; 2017 2018 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2019 == Diagnostic::Ignored) 2020 return; 2021 2022 // Build the list of bases and members in the order that they'll 2023 // actually be initialized. The explicit initializers should be in 2024 // this same order but may be missing things. 2025 llvm::SmallVector<const void*, 32> IdealInitKeys; 2026 2027 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2028 2029 // 1. Virtual bases. 2030 for (CXXRecordDecl::base_class_const_iterator VBase = 2031 ClassDecl->vbases_begin(), 2032 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2033 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2034 2035 // 2. Non-virtual bases. 2036 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2037 E = ClassDecl->bases_end(); Base != E; ++Base) { 2038 if (Base->isVirtual()) 2039 continue; 2040 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2041 } 2042 2043 // 3. Direct fields. 2044 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2045 E = ClassDecl->field_end(); Field != E; ++Field) 2046 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2047 2048 unsigned NumIdealInits = IdealInitKeys.size(); 2049 unsigned IdealIndex = 0; 2050 2051 CXXBaseOrMemberInitializer *PrevInit = 0; 2052 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2053 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2054 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2055 2056 // Scan forward to try to find this initializer in the idealized 2057 // initializers list. 2058 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2059 if (InitKey == IdealInitKeys[IdealIndex]) 2060 break; 2061 2062 // If we didn't find this initializer, it must be because we 2063 // scanned past it on a previous iteration. That can only 2064 // happen if we're out of order; emit a warning. 2065 if (IdealIndex == NumIdealInits && PrevInit) { 2066 Sema::SemaDiagnosticBuilder D = 2067 SemaRef.Diag(PrevInit->getSourceLocation(), 2068 diag::warn_initializer_out_of_order); 2069 2070 if (PrevInit->isMemberInitializer()) 2071 D << 0 << PrevInit->getMember()->getDeclName(); 2072 else 2073 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2074 2075 if (Init->isMemberInitializer()) 2076 D << 0 << Init->getMember()->getDeclName(); 2077 else 2078 D << 1 << Init->getBaseClassInfo()->getType(); 2079 2080 // Move back to the initializer's location in the ideal list. 2081 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2082 if (InitKey == IdealInitKeys[IdealIndex]) 2083 break; 2084 2085 assert(IdealIndex != NumIdealInits && 2086 "initializer not found in initializer list"); 2087 } 2088 2089 PrevInit = Init; 2090 } 2091} 2092 2093namespace { 2094bool CheckRedundantInit(Sema &S, 2095 CXXBaseOrMemberInitializer *Init, 2096 CXXBaseOrMemberInitializer *&PrevInit) { 2097 if (!PrevInit) { 2098 PrevInit = Init; 2099 return false; 2100 } 2101 2102 if (FieldDecl *Field = Init->getMember()) 2103 S.Diag(Init->getSourceLocation(), 2104 diag::err_multiple_mem_initialization) 2105 << Field->getDeclName() 2106 << Init->getSourceRange(); 2107 else { 2108 Type *BaseClass = Init->getBaseClass(); 2109 assert(BaseClass && "neither field nor base"); 2110 S.Diag(Init->getSourceLocation(), 2111 diag::err_multiple_base_initialization) 2112 << QualType(BaseClass, 0) 2113 << Init->getSourceRange(); 2114 } 2115 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2116 << 0 << PrevInit->getSourceRange(); 2117 2118 return true; 2119} 2120 2121typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2122typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2123 2124bool CheckRedundantUnionInit(Sema &S, 2125 CXXBaseOrMemberInitializer *Init, 2126 RedundantUnionMap &Unions) { 2127 FieldDecl *Field = Init->getMember(); 2128 RecordDecl *Parent = Field->getParent(); 2129 if (!Parent->isAnonymousStructOrUnion()) 2130 return false; 2131 2132 NamedDecl *Child = Field; 2133 do { 2134 if (Parent->isUnion()) { 2135 UnionEntry &En = Unions[Parent]; 2136 if (En.first && En.first != Child) { 2137 S.Diag(Init->getSourceLocation(), 2138 diag::err_multiple_mem_union_initialization) 2139 << Field->getDeclName() 2140 << Init->getSourceRange(); 2141 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2142 << 0 << En.second->getSourceRange(); 2143 return true; 2144 } else if (!En.first) { 2145 En.first = Child; 2146 En.second = Init; 2147 } 2148 } 2149 2150 Child = Parent; 2151 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2152 } while (Parent->isAnonymousStructOrUnion()); 2153 2154 return false; 2155} 2156} 2157 2158/// ActOnMemInitializers - Handle the member initializers for a constructor. 2159void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2160 SourceLocation ColonLoc, 2161 MemInitTy **meminits, unsigned NumMemInits, 2162 bool AnyErrors) { 2163 if (!ConstructorDecl) 2164 return; 2165 2166 AdjustDeclIfTemplate(ConstructorDecl); 2167 2168 CXXConstructorDecl *Constructor 2169 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2170 2171 if (!Constructor) { 2172 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2173 return; 2174 } 2175 2176 CXXBaseOrMemberInitializer **MemInits = 2177 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2178 2179 // Mapping for the duplicate initializers check. 2180 // For member initializers, this is keyed with a FieldDecl*. 2181 // For base initializers, this is keyed with a Type*. 2182 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2183 2184 // Mapping for the inconsistent anonymous-union initializers check. 2185 RedundantUnionMap MemberUnions; 2186 2187 bool HadError = false; 2188 for (unsigned i = 0; i < NumMemInits; i++) { 2189 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2190 2191 // Set the source order index. 2192 Init->setSourceOrder(i); 2193 2194 if (Init->isMemberInitializer()) { 2195 FieldDecl *Field = Init->getMember(); 2196 if (CheckRedundantInit(*this, Init, Members[Field]) || 2197 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2198 HadError = true; 2199 } else { 2200 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2201 if (CheckRedundantInit(*this, Init, Members[Key])) 2202 HadError = true; 2203 } 2204 } 2205 2206 if (HadError) 2207 return; 2208 2209 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2210 2211 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2212} 2213 2214void 2215Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2216 CXXRecordDecl *ClassDecl) { 2217 // Ignore dependent contexts. 2218 if (ClassDecl->isDependentContext()) 2219 return; 2220 2221 // FIXME: all the access-control diagnostics are positioned on the 2222 // field/base declaration. That's probably good; that said, the 2223 // user might reasonably want to know why the destructor is being 2224 // emitted, and we currently don't say. 2225 2226 // Non-static data members. 2227 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2228 E = ClassDecl->field_end(); I != E; ++I) { 2229 FieldDecl *Field = *I; 2230 if (Field->isInvalidDecl()) 2231 continue; 2232 QualType FieldType = Context.getBaseElementType(Field->getType()); 2233 2234 const RecordType* RT = FieldType->getAs<RecordType>(); 2235 if (!RT) 2236 continue; 2237 2238 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2239 if (FieldClassDecl->hasTrivialDestructor()) 2240 continue; 2241 2242 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2243 CheckDestructorAccess(Field->getLocation(), Dtor, 2244 PDiag(diag::err_access_dtor_field) 2245 << Field->getDeclName() 2246 << FieldType); 2247 2248 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2249 } 2250 2251 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2252 2253 // Bases. 2254 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2255 E = ClassDecl->bases_end(); Base != E; ++Base) { 2256 // Bases are always records in a well-formed non-dependent class. 2257 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2258 2259 // Remember direct virtual bases. 2260 if (Base->isVirtual()) 2261 DirectVirtualBases.insert(RT); 2262 2263 // Ignore trivial destructors. 2264 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2265 if (BaseClassDecl->hasTrivialDestructor()) 2266 continue; 2267 2268 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2269 2270 // FIXME: caret should be on the start of the class name 2271 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2272 PDiag(diag::err_access_dtor_base) 2273 << Base->getType() 2274 << Base->getSourceRange()); 2275 2276 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2277 } 2278 2279 // Virtual bases. 2280 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2281 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2282 2283 // Bases are always records in a well-formed non-dependent class. 2284 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2285 2286 // Ignore direct virtual bases. 2287 if (DirectVirtualBases.count(RT)) 2288 continue; 2289 2290 // Ignore trivial destructors. 2291 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2292 if (BaseClassDecl->hasTrivialDestructor()) 2293 continue; 2294 2295 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2296 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2297 PDiag(diag::err_access_dtor_vbase) 2298 << VBase->getType()); 2299 2300 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2301 } 2302} 2303 2304void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2305 if (!CDtorDecl) 2306 return; 2307 2308 if (CXXConstructorDecl *Constructor 2309 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2310 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2311} 2312 2313bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2314 unsigned DiagID, AbstractDiagSelID SelID) { 2315 if (SelID == -1) 2316 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2317 else 2318 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2319} 2320 2321bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2322 const PartialDiagnostic &PD) { 2323 if (!getLangOptions().CPlusPlus) 2324 return false; 2325 2326 if (const ArrayType *AT = Context.getAsArrayType(T)) 2327 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2328 2329 if (const PointerType *PT = T->getAs<PointerType>()) { 2330 // Find the innermost pointer type. 2331 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2332 PT = T; 2333 2334 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2335 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2336 } 2337 2338 const RecordType *RT = T->getAs<RecordType>(); 2339 if (!RT) 2340 return false; 2341 2342 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2343 2344 // We can't answer whether something is abstract until it has a 2345 // definition. If it's currently being defined, we'll walk back 2346 // over all the declarations when we have a full definition. 2347 const CXXRecordDecl *Def = RD->getDefinition(); 2348 if (!Def || Def->isBeingDefined()) 2349 return false; 2350 2351 if (!RD->isAbstract()) 2352 return false; 2353 2354 Diag(Loc, PD) << RD->getDeclName(); 2355 DiagnoseAbstractType(RD); 2356 2357 return true; 2358} 2359 2360void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2361 // Check if we've already emitted the list of pure virtual functions 2362 // for this class. 2363 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2364 return; 2365 2366 CXXFinalOverriderMap FinalOverriders; 2367 RD->getFinalOverriders(FinalOverriders); 2368 2369 // Keep a set of seen pure methods so we won't diagnose the same method 2370 // more than once. 2371 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2372 2373 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2374 MEnd = FinalOverriders.end(); 2375 M != MEnd; 2376 ++M) { 2377 for (OverridingMethods::iterator SO = M->second.begin(), 2378 SOEnd = M->second.end(); 2379 SO != SOEnd; ++SO) { 2380 // C++ [class.abstract]p4: 2381 // A class is abstract if it contains or inherits at least one 2382 // pure virtual function for which the final overrider is pure 2383 // virtual. 2384 2385 // 2386 if (SO->second.size() != 1) 2387 continue; 2388 2389 if (!SO->second.front().Method->isPure()) 2390 continue; 2391 2392 if (!SeenPureMethods.insert(SO->second.front().Method)) 2393 continue; 2394 2395 Diag(SO->second.front().Method->getLocation(), 2396 diag::note_pure_virtual_function) 2397 << SO->second.front().Method->getDeclName(); 2398 } 2399 } 2400 2401 if (!PureVirtualClassDiagSet) 2402 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2403 PureVirtualClassDiagSet->insert(RD); 2404} 2405 2406namespace { 2407struct AbstractUsageInfo { 2408 Sema &S; 2409 CXXRecordDecl *Record; 2410 CanQualType AbstractType; 2411 bool Invalid; 2412 2413 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2414 : S(S), Record(Record), 2415 AbstractType(S.Context.getCanonicalType( 2416 S.Context.getTypeDeclType(Record))), 2417 Invalid(false) {} 2418 2419 void DiagnoseAbstractType() { 2420 if (Invalid) return; 2421 S.DiagnoseAbstractType(Record); 2422 Invalid = true; 2423 } 2424 2425 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2426}; 2427 2428struct CheckAbstractUsage { 2429 AbstractUsageInfo &Info; 2430 const NamedDecl *Ctx; 2431 2432 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2433 : Info(Info), Ctx(Ctx) {} 2434 2435 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2436 switch (TL.getTypeLocClass()) { 2437#define ABSTRACT_TYPELOC(CLASS, PARENT) 2438#define TYPELOC(CLASS, PARENT) \ 2439 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2440#include "clang/AST/TypeLocNodes.def" 2441 } 2442 } 2443 2444 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2445 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2446 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2447 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2448 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2449 } 2450 } 2451 2452 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2453 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2454 } 2455 2456 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2457 // Visit the type parameters from a permissive context. 2458 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2459 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2460 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2461 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2462 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2463 // TODO: other template argument types? 2464 } 2465 } 2466 2467 // Visit pointee types from a permissive context. 2468#define CheckPolymorphic(Type) \ 2469 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2470 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2471 } 2472 CheckPolymorphic(PointerTypeLoc) 2473 CheckPolymorphic(ReferenceTypeLoc) 2474 CheckPolymorphic(MemberPointerTypeLoc) 2475 CheckPolymorphic(BlockPointerTypeLoc) 2476 2477 /// Handle all the types we haven't given a more specific 2478 /// implementation for above. 2479 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2480 // Every other kind of type that we haven't called out already 2481 // that has an inner type is either (1) sugar or (2) contains that 2482 // inner type in some way as a subobject. 2483 if (TypeLoc Next = TL.getNextTypeLoc()) 2484 return Visit(Next, Sel); 2485 2486 // If there's no inner type and we're in a permissive context, 2487 // don't diagnose. 2488 if (Sel == Sema::AbstractNone) return; 2489 2490 // Check whether the type matches the abstract type. 2491 QualType T = TL.getType(); 2492 if (T->isArrayType()) { 2493 Sel = Sema::AbstractArrayType; 2494 T = Info.S.Context.getBaseElementType(T); 2495 } 2496 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2497 if (CT != Info.AbstractType) return; 2498 2499 // It matched; do some magic. 2500 if (Sel == Sema::AbstractArrayType) { 2501 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2502 << T << TL.getSourceRange(); 2503 } else { 2504 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2505 << Sel << T << TL.getSourceRange(); 2506 } 2507 Info.DiagnoseAbstractType(); 2508 } 2509}; 2510 2511void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2512 Sema::AbstractDiagSelID Sel) { 2513 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2514} 2515 2516} 2517 2518/// Check for invalid uses of an abstract type in a method declaration. 2519static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2520 CXXMethodDecl *MD) { 2521 // No need to do the check on definitions, which require that 2522 // the return/param types be complete. 2523 if (MD->isThisDeclarationADefinition()) 2524 return; 2525 2526 // For safety's sake, just ignore it if we don't have type source 2527 // information. This should never happen for non-implicit methods, 2528 // but... 2529 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2530 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2531} 2532 2533/// Check for invalid uses of an abstract type within a class definition. 2534static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2535 CXXRecordDecl *RD) { 2536 for (CXXRecordDecl::decl_iterator 2537 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2538 Decl *D = *I; 2539 if (D->isImplicit()) continue; 2540 2541 // Methods and method templates. 2542 if (isa<CXXMethodDecl>(D)) { 2543 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2544 } else if (isa<FunctionTemplateDecl>(D)) { 2545 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2546 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2547 2548 // Fields and static variables. 2549 } else if (isa<FieldDecl>(D)) { 2550 FieldDecl *FD = cast<FieldDecl>(D); 2551 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2552 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2553 } else if (isa<VarDecl>(D)) { 2554 VarDecl *VD = cast<VarDecl>(D); 2555 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2556 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2557 2558 // Nested classes and class templates. 2559 } else if (isa<CXXRecordDecl>(D)) { 2560 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2561 } else if (isa<ClassTemplateDecl>(D)) { 2562 CheckAbstractClassUsage(Info, 2563 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2564 } 2565 } 2566} 2567 2568/// \brief Perform semantic checks on a class definition that has been 2569/// completing, introducing implicitly-declared members, checking for 2570/// abstract types, etc. 2571void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2572 if (!Record || Record->isInvalidDecl()) 2573 return; 2574 2575 if (!Record->isDependentType()) 2576 AddImplicitlyDeclaredMembersToClass(Record); 2577 2578 if (Record->isInvalidDecl()) 2579 return; 2580 2581 // Set access bits correctly on the directly-declared conversions. 2582 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2583 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2584 Convs->setAccess(I, (*I)->getAccess()); 2585 2586 // Determine whether we need to check for final overriders. We do 2587 // this either when there are virtual base classes (in which case we 2588 // may end up finding multiple final overriders for a given virtual 2589 // function) or any of the base classes is abstract (in which case 2590 // we might detect that this class is abstract). 2591 bool CheckFinalOverriders = false; 2592 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2593 !Record->isDependentType()) { 2594 if (Record->getNumVBases()) 2595 CheckFinalOverriders = true; 2596 else if (!Record->isAbstract()) { 2597 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2598 BEnd = Record->bases_end(); 2599 B != BEnd; ++B) { 2600 CXXRecordDecl *BaseDecl 2601 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2602 if (BaseDecl->isAbstract()) { 2603 CheckFinalOverriders = true; 2604 break; 2605 } 2606 } 2607 } 2608 } 2609 2610 if (CheckFinalOverriders) { 2611 CXXFinalOverriderMap FinalOverriders; 2612 Record->getFinalOverriders(FinalOverriders); 2613 2614 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2615 MEnd = FinalOverriders.end(); 2616 M != MEnd; ++M) { 2617 for (OverridingMethods::iterator SO = M->second.begin(), 2618 SOEnd = M->second.end(); 2619 SO != SOEnd; ++SO) { 2620 assert(SO->second.size() > 0 && 2621 "All virtual functions have overridding virtual functions"); 2622 if (SO->second.size() == 1) { 2623 // C++ [class.abstract]p4: 2624 // A class is abstract if it contains or inherits at least one 2625 // pure virtual function for which the final overrider is pure 2626 // virtual. 2627 if (SO->second.front().Method->isPure()) 2628 Record->setAbstract(true); 2629 continue; 2630 } 2631 2632 // C++ [class.virtual]p2: 2633 // In a derived class, if a virtual member function of a base 2634 // class subobject has more than one final overrider the 2635 // program is ill-formed. 2636 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2637 << (NamedDecl *)M->first << Record; 2638 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2639 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2640 OMEnd = SO->second.end(); 2641 OM != OMEnd; ++OM) 2642 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2643 << (NamedDecl *)M->first << OM->Method->getParent(); 2644 2645 Record->setInvalidDecl(); 2646 } 2647 } 2648 } 2649 2650 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2651 AbstractUsageInfo Info(*this, Record); 2652 CheckAbstractClassUsage(Info, Record); 2653 } 2654 2655 // If this is not an aggregate type and has no user-declared constructor, 2656 // complain about any non-static data members of reference or const scalar 2657 // type, since they will never get initializers. 2658 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2659 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2660 bool Complained = false; 2661 for (RecordDecl::field_iterator F = Record->field_begin(), 2662 FEnd = Record->field_end(); 2663 F != FEnd; ++F) { 2664 if (F->getType()->isReferenceType() || 2665 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2666 if (!Complained) { 2667 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2668 << Record->getTagKind() << Record; 2669 Complained = true; 2670 } 2671 2672 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2673 << F->getType()->isReferenceType() 2674 << F->getDeclName(); 2675 } 2676 } 2677 } 2678 2679 if (Record->isDynamicClass()) 2680 DynamicClasses.push_back(Record); 2681} 2682 2683void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2684 DeclPtrTy TagDecl, 2685 SourceLocation LBrac, 2686 SourceLocation RBrac, 2687 AttributeList *AttrList) { 2688 if (!TagDecl) 2689 return; 2690 2691 AdjustDeclIfTemplate(TagDecl); 2692 2693 ActOnFields(S, RLoc, TagDecl, 2694 (DeclPtrTy*)FieldCollector->getCurFields(), 2695 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2696 2697 CheckCompletedCXXClass( 2698 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2699} 2700 2701namespace { 2702 /// \brief Helper class that collects exception specifications for 2703 /// implicitly-declared special member functions. 2704 class ImplicitExceptionSpecification { 2705 ASTContext &Context; 2706 bool AllowsAllExceptions; 2707 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2708 llvm::SmallVector<QualType, 4> Exceptions; 2709 2710 public: 2711 explicit ImplicitExceptionSpecification(ASTContext &Context) 2712 : Context(Context), AllowsAllExceptions(false) { } 2713 2714 /// \brief Whether the special member function should have any 2715 /// exception specification at all. 2716 bool hasExceptionSpecification() const { 2717 return !AllowsAllExceptions; 2718 } 2719 2720 /// \brief Whether the special member function should have a 2721 /// throw(...) exception specification (a Microsoft extension). 2722 bool hasAnyExceptionSpecification() const { 2723 return false; 2724 } 2725 2726 /// \brief The number of exceptions in the exception specification. 2727 unsigned size() const { return Exceptions.size(); } 2728 2729 /// \brief The set of exceptions in the exception specification. 2730 const QualType *data() const { return Exceptions.data(); } 2731 2732 /// \brief Note that 2733 void CalledDecl(CXXMethodDecl *Method) { 2734 // If we already know that we allow all exceptions, do nothing. 2735 if (AllowsAllExceptions || !Method) 2736 return; 2737 2738 const FunctionProtoType *Proto 2739 = Method->getType()->getAs<FunctionProtoType>(); 2740 2741 // If this function can throw any exceptions, make a note of that. 2742 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2743 AllowsAllExceptions = true; 2744 ExceptionsSeen.clear(); 2745 Exceptions.clear(); 2746 return; 2747 } 2748 2749 // Record the exceptions in this function's exception specification. 2750 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2751 EEnd = Proto->exception_end(); 2752 E != EEnd; ++E) 2753 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2754 Exceptions.push_back(*E); 2755 } 2756 }; 2757} 2758 2759 2760/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2761/// special functions, such as the default constructor, copy 2762/// constructor, or destructor, to the given C++ class (C++ 2763/// [special]p1). This routine can only be executed just before the 2764/// definition of the class is complete. 2765void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2766 if (!ClassDecl->hasUserDeclaredConstructor()) 2767 ++ASTContext::NumImplicitDefaultConstructors; 2768 2769 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2770 ++ASTContext::NumImplicitCopyConstructors; 2771 2772 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2773 ++ASTContext::NumImplicitCopyAssignmentOperators; 2774 2775 // If we have a dynamic class, then the copy assignment operator may be 2776 // virtual, so we have to declare it immediately. This ensures that, e.g., 2777 // it shows up in the right place in the vtable and that we diagnose 2778 // problems with the implicit exception specification. 2779 if (ClassDecl->isDynamicClass()) 2780 DeclareImplicitCopyAssignment(ClassDecl); 2781 } 2782 2783 if (!ClassDecl->hasUserDeclaredDestructor()) { 2784 ++ASTContext::NumImplicitDestructors; 2785 2786 // If we have a dynamic class, then the destructor may be virtual, so we 2787 // have to declare the destructor immediately. This ensures that, e.g., it 2788 // shows up in the right place in the vtable and that we diagnose problems 2789 // with the implicit exception specification. 2790 if (ClassDecl->isDynamicClass()) 2791 DeclareImplicitDestructor(ClassDecl); 2792 } 2793} 2794 2795void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2796 Decl *D = TemplateD.getAs<Decl>(); 2797 if (!D) 2798 return; 2799 2800 TemplateParameterList *Params = 0; 2801 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2802 Params = Template->getTemplateParameters(); 2803 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2804 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2805 Params = PartialSpec->getTemplateParameters(); 2806 else 2807 return; 2808 2809 for (TemplateParameterList::iterator Param = Params->begin(), 2810 ParamEnd = Params->end(); 2811 Param != ParamEnd; ++Param) { 2812 NamedDecl *Named = cast<NamedDecl>(*Param); 2813 if (Named->getDeclName()) { 2814 S->AddDecl(DeclPtrTy::make(Named)); 2815 IdResolver.AddDecl(Named); 2816 } 2817 } 2818} 2819 2820void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2821 if (!RecordD) return; 2822 AdjustDeclIfTemplate(RecordD); 2823 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2824 PushDeclContext(S, Record); 2825} 2826 2827void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2828 if (!RecordD) return; 2829 PopDeclContext(); 2830} 2831 2832/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2833/// parsing a top-level (non-nested) C++ class, and we are now 2834/// parsing those parts of the given Method declaration that could 2835/// not be parsed earlier (C++ [class.mem]p2), such as default 2836/// arguments. This action should enter the scope of the given 2837/// Method declaration as if we had just parsed the qualified method 2838/// name. However, it should not bring the parameters into scope; 2839/// that will be performed by ActOnDelayedCXXMethodParameter. 2840void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2841} 2842 2843/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2844/// C++ method declaration. We're (re-)introducing the given 2845/// function parameter into scope for use in parsing later parts of 2846/// the method declaration. For example, we could see an 2847/// ActOnParamDefaultArgument event for this parameter. 2848void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2849 if (!ParamD) 2850 return; 2851 2852 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2853 2854 // If this parameter has an unparsed default argument, clear it out 2855 // to make way for the parsed default argument. 2856 if (Param->hasUnparsedDefaultArg()) 2857 Param->setDefaultArg(0); 2858 2859 S->AddDecl(DeclPtrTy::make(Param)); 2860 if (Param->getDeclName()) 2861 IdResolver.AddDecl(Param); 2862} 2863 2864/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2865/// processing the delayed method declaration for Method. The method 2866/// declaration is now considered finished. There may be a separate 2867/// ActOnStartOfFunctionDef action later (not necessarily 2868/// immediately!) for this method, if it was also defined inside the 2869/// class body. 2870void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2871 if (!MethodD) 2872 return; 2873 2874 AdjustDeclIfTemplate(MethodD); 2875 2876 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2877 2878 // Now that we have our default arguments, check the constructor 2879 // again. It could produce additional diagnostics or affect whether 2880 // the class has implicitly-declared destructors, among other 2881 // things. 2882 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2883 CheckConstructor(Constructor); 2884 2885 // Check the default arguments, which we may have added. 2886 if (!Method->isInvalidDecl()) 2887 CheckCXXDefaultArguments(Method); 2888} 2889 2890/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2891/// the well-formedness of the constructor declarator @p D with type @p 2892/// R. If there are any errors in the declarator, this routine will 2893/// emit diagnostics and set the invalid bit to true. In any case, the type 2894/// will be updated to reflect a well-formed type for the constructor and 2895/// returned. 2896QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2897 FunctionDecl::StorageClass &SC) { 2898 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2899 2900 // C++ [class.ctor]p3: 2901 // A constructor shall not be virtual (10.3) or static (9.4). A 2902 // constructor can be invoked for a const, volatile or const 2903 // volatile object. A constructor shall not be declared const, 2904 // volatile, or const volatile (9.3.2). 2905 if (isVirtual) { 2906 if (!D.isInvalidType()) 2907 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2908 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2909 << SourceRange(D.getIdentifierLoc()); 2910 D.setInvalidType(); 2911 } 2912 if (SC == FunctionDecl::Static) { 2913 if (!D.isInvalidType()) 2914 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2915 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2916 << SourceRange(D.getIdentifierLoc()); 2917 D.setInvalidType(); 2918 SC = FunctionDecl::None; 2919 } 2920 2921 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2922 if (FTI.TypeQuals != 0) { 2923 if (FTI.TypeQuals & Qualifiers::Const) 2924 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2925 << "const" << SourceRange(D.getIdentifierLoc()); 2926 if (FTI.TypeQuals & Qualifiers::Volatile) 2927 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2928 << "volatile" << SourceRange(D.getIdentifierLoc()); 2929 if (FTI.TypeQuals & Qualifiers::Restrict) 2930 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2931 << "restrict" << SourceRange(D.getIdentifierLoc()); 2932 } 2933 2934 // Rebuild the function type "R" without any type qualifiers (in 2935 // case any of the errors above fired) and with "void" as the 2936 // return type, since constructors don't have return types. 2937 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2938 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2939 Proto->getNumArgs(), 2940 Proto->isVariadic(), 0, 2941 Proto->hasExceptionSpec(), 2942 Proto->hasAnyExceptionSpec(), 2943 Proto->getNumExceptions(), 2944 Proto->exception_begin(), 2945 Proto->getExtInfo()); 2946} 2947 2948/// CheckConstructor - Checks a fully-formed constructor for 2949/// well-formedness, issuing any diagnostics required. Returns true if 2950/// the constructor declarator is invalid. 2951void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2952 CXXRecordDecl *ClassDecl 2953 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2954 if (!ClassDecl) 2955 return Constructor->setInvalidDecl(); 2956 2957 // C++ [class.copy]p3: 2958 // A declaration of a constructor for a class X is ill-formed if 2959 // its first parameter is of type (optionally cv-qualified) X and 2960 // either there are no other parameters or else all other 2961 // parameters have default arguments. 2962 if (!Constructor->isInvalidDecl() && 2963 ((Constructor->getNumParams() == 1) || 2964 (Constructor->getNumParams() > 1 && 2965 Constructor->getParamDecl(1)->hasDefaultArg())) && 2966 Constructor->getTemplateSpecializationKind() 2967 != TSK_ImplicitInstantiation) { 2968 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2969 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2970 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2971 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2972 const char *ConstRef 2973 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2974 : " const &"; 2975 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2976 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2977 2978 // FIXME: Rather that making the constructor invalid, we should endeavor 2979 // to fix the type. 2980 Constructor->setInvalidDecl(); 2981 } 2982 } 2983 2984 // Notify the class that we've added a constructor. In principle we 2985 // don't need to do this for out-of-line declarations; in practice 2986 // we only instantiate the most recent declaration of a method, so 2987 // we have to call this for everything but friends. 2988 if (!Constructor->getFriendObjectKind()) 2989 ClassDecl->addedConstructor(Context, Constructor); 2990} 2991 2992/// CheckDestructor - Checks a fully-formed destructor definition for 2993/// well-formedness, issuing any diagnostics required. Returns true 2994/// on error. 2995bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2996 CXXRecordDecl *RD = Destructor->getParent(); 2997 2998 if (Destructor->isVirtual()) { 2999 SourceLocation Loc; 3000 3001 if (!Destructor->isImplicit()) 3002 Loc = Destructor->getLocation(); 3003 else 3004 Loc = RD->getLocation(); 3005 3006 // If we have a virtual destructor, look up the deallocation function 3007 FunctionDecl *OperatorDelete = 0; 3008 DeclarationName Name = 3009 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3010 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3011 return true; 3012 3013 MarkDeclarationReferenced(Loc, OperatorDelete); 3014 3015 Destructor->setOperatorDelete(OperatorDelete); 3016 } 3017 3018 return false; 3019} 3020 3021static inline bool 3022FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3023 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3024 FTI.ArgInfo[0].Param && 3025 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 3026} 3027 3028/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3029/// the well-formednes of the destructor declarator @p D with type @p 3030/// R. If there are any errors in the declarator, this routine will 3031/// emit diagnostics and set the declarator to invalid. Even if this happens, 3032/// will be updated to reflect a well-formed type for the destructor and 3033/// returned. 3034QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3035 FunctionDecl::StorageClass& SC) { 3036 // C++ [class.dtor]p1: 3037 // [...] A typedef-name that names a class is a class-name 3038 // (7.1.3); however, a typedef-name that names a class shall not 3039 // be used as the identifier in the declarator for a destructor 3040 // declaration. 3041 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3042 if (isa<TypedefType>(DeclaratorType)) 3043 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3044 << DeclaratorType; 3045 3046 // C++ [class.dtor]p2: 3047 // A destructor is used to destroy objects of its class type. A 3048 // destructor takes no parameters, and no return type can be 3049 // specified for it (not even void). The address of a destructor 3050 // shall not be taken. A destructor shall not be static. A 3051 // destructor can be invoked for a const, volatile or const 3052 // volatile object. A destructor shall not be declared const, 3053 // volatile or const volatile (9.3.2). 3054 if (SC == FunctionDecl::Static) { 3055 if (!D.isInvalidType()) 3056 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3057 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3058 << SourceRange(D.getIdentifierLoc()) 3059 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3060 3061 SC = FunctionDecl::None; 3062 } 3063 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3064 // Destructors don't have return types, but the parser will 3065 // happily parse something like: 3066 // 3067 // class X { 3068 // float ~X(); 3069 // }; 3070 // 3071 // The return type will be eliminated later. 3072 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3073 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3074 << SourceRange(D.getIdentifierLoc()); 3075 } 3076 3077 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3078 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3079 if (FTI.TypeQuals & Qualifiers::Const) 3080 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3081 << "const" << SourceRange(D.getIdentifierLoc()); 3082 if (FTI.TypeQuals & Qualifiers::Volatile) 3083 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3084 << "volatile" << SourceRange(D.getIdentifierLoc()); 3085 if (FTI.TypeQuals & Qualifiers::Restrict) 3086 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3087 << "restrict" << SourceRange(D.getIdentifierLoc()); 3088 D.setInvalidType(); 3089 } 3090 3091 // Make sure we don't have any parameters. 3092 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3093 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3094 3095 // Delete the parameters. 3096 FTI.freeArgs(); 3097 D.setInvalidType(); 3098 } 3099 3100 // Make sure the destructor isn't variadic. 3101 if (FTI.isVariadic) { 3102 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3103 D.setInvalidType(); 3104 } 3105 3106 // Rebuild the function type "R" without any type qualifiers or 3107 // parameters (in case any of the errors above fired) and with 3108 // "void" as the return type, since destructors don't have return 3109 // types. 3110 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3111 if (!Proto) 3112 return QualType(); 3113 3114 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3115 Proto->hasExceptionSpec(), 3116 Proto->hasAnyExceptionSpec(), 3117 Proto->getNumExceptions(), 3118 Proto->exception_begin(), 3119 Proto->getExtInfo()); 3120} 3121 3122/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3123/// well-formednes of the conversion function declarator @p D with 3124/// type @p R. If there are any errors in the declarator, this routine 3125/// will emit diagnostics and return true. Otherwise, it will return 3126/// false. Either way, the type @p R will be updated to reflect a 3127/// well-formed type for the conversion operator. 3128void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3129 FunctionDecl::StorageClass& SC) { 3130 // C++ [class.conv.fct]p1: 3131 // Neither parameter types nor return type can be specified. The 3132 // type of a conversion function (8.3.5) is "function taking no 3133 // parameter returning conversion-type-id." 3134 if (SC == FunctionDecl::Static) { 3135 if (!D.isInvalidType()) 3136 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3137 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3138 << SourceRange(D.getIdentifierLoc()); 3139 D.setInvalidType(); 3140 SC = FunctionDecl::None; 3141 } 3142 3143 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3144 3145 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3146 // Conversion functions don't have return types, but the parser will 3147 // happily parse something like: 3148 // 3149 // class X { 3150 // float operator bool(); 3151 // }; 3152 // 3153 // The return type will be changed later anyway. 3154 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3155 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3156 << SourceRange(D.getIdentifierLoc()); 3157 D.setInvalidType(); 3158 } 3159 3160 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3161 3162 // Make sure we don't have any parameters. 3163 if (Proto->getNumArgs() > 0) { 3164 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3165 3166 // Delete the parameters. 3167 D.getTypeObject(0).Fun.freeArgs(); 3168 D.setInvalidType(); 3169 } else if (Proto->isVariadic()) { 3170 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3171 D.setInvalidType(); 3172 } 3173 3174 // Diagnose "&operator bool()" and other such nonsense. This 3175 // is actually a gcc extension which we don't support. 3176 if (Proto->getResultType() != ConvType) { 3177 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3178 << Proto->getResultType(); 3179 D.setInvalidType(); 3180 ConvType = Proto->getResultType(); 3181 } 3182 3183 // C++ [class.conv.fct]p4: 3184 // The conversion-type-id shall not represent a function type nor 3185 // an array type. 3186 if (ConvType->isArrayType()) { 3187 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3188 ConvType = Context.getPointerType(ConvType); 3189 D.setInvalidType(); 3190 } else if (ConvType->isFunctionType()) { 3191 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3192 ConvType = Context.getPointerType(ConvType); 3193 D.setInvalidType(); 3194 } 3195 3196 // Rebuild the function type "R" without any parameters (in case any 3197 // of the errors above fired) and with the conversion type as the 3198 // return type. 3199 if (D.isInvalidType()) { 3200 R = Context.getFunctionType(ConvType, 0, 0, false, 3201 Proto->getTypeQuals(), 3202 Proto->hasExceptionSpec(), 3203 Proto->hasAnyExceptionSpec(), 3204 Proto->getNumExceptions(), 3205 Proto->exception_begin(), 3206 Proto->getExtInfo()); 3207 } 3208 3209 // C++0x explicit conversion operators. 3210 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3211 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3212 diag::warn_explicit_conversion_functions) 3213 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3214} 3215 3216/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3217/// the declaration of the given C++ conversion function. This routine 3218/// is responsible for recording the conversion function in the C++ 3219/// class, if possible. 3220Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3221 assert(Conversion && "Expected to receive a conversion function declaration"); 3222 3223 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3224 3225 // Make sure we aren't redeclaring the conversion function. 3226 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3227 3228 // C++ [class.conv.fct]p1: 3229 // [...] A conversion function is never used to convert a 3230 // (possibly cv-qualified) object to the (possibly cv-qualified) 3231 // same object type (or a reference to it), to a (possibly 3232 // cv-qualified) base class of that type (or a reference to it), 3233 // or to (possibly cv-qualified) void. 3234 // FIXME: Suppress this warning if the conversion function ends up being a 3235 // virtual function that overrides a virtual function in a base class. 3236 QualType ClassType 3237 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3238 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3239 ConvType = ConvTypeRef->getPointeeType(); 3240 if (ConvType->isRecordType()) { 3241 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3242 if (ConvType == ClassType) 3243 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3244 << ClassType; 3245 else if (IsDerivedFrom(ClassType, ConvType)) 3246 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3247 << ClassType << ConvType; 3248 } else if (ConvType->isVoidType()) { 3249 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3250 << ClassType << ConvType; 3251 } 3252 3253 if (Conversion->getPrimaryTemplate()) { 3254 // ignore specializations 3255 } else if (Conversion->getPreviousDeclaration()) { 3256 if (FunctionTemplateDecl *ConversionTemplate 3257 = Conversion->getDescribedFunctionTemplate()) { 3258 if (ClassDecl->replaceConversion( 3259 ConversionTemplate->getPreviousDeclaration(), 3260 ConversionTemplate)) 3261 return DeclPtrTy::make(ConversionTemplate); 3262 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3263 Conversion)) 3264 return DeclPtrTy::make(Conversion); 3265 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3266 } else if (FunctionTemplateDecl *ConversionTemplate 3267 = Conversion->getDescribedFunctionTemplate()) 3268 ClassDecl->addConversionFunction(ConversionTemplate); 3269 else 3270 ClassDecl->addConversionFunction(Conversion); 3271 3272 return DeclPtrTy::make(Conversion); 3273} 3274 3275//===----------------------------------------------------------------------===// 3276// Namespace Handling 3277//===----------------------------------------------------------------------===// 3278 3279/// ActOnStartNamespaceDef - This is called at the start of a namespace 3280/// definition. 3281Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3282 SourceLocation IdentLoc, 3283 IdentifierInfo *II, 3284 SourceLocation LBrace, 3285 AttributeList *AttrList) { 3286 NamespaceDecl *Namespc = 3287 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3288 Namespc->setLBracLoc(LBrace); 3289 3290 Scope *DeclRegionScope = NamespcScope->getParent(); 3291 3292 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3293 3294 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3295 PushPragmaVisibility(attr->getVisibility()); 3296 3297 if (II) { 3298 // C++ [namespace.def]p2: 3299 // The identifier in an original-namespace-definition shall not have been 3300 // previously defined in the declarative region in which the 3301 // original-namespace-definition appears. The identifier in an 3302 // original-namespace-definition is the name of the namespace. Subsequently 3303 // in that declarative region, it is treated as an original-namespace-name. 3304 3305 NamedDecl *PrevDecl 3306 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3307 ForRedeclaration); 3308 3309 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3310 // This is an extended namespace definition. 3311 // Attach this namespace decl to the chain of extended namespace 3312 // definitions. 3313 OrigNS->setNextNamespace(Namespc); 3314 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3315 3316 // Remove the previous declaration from the scope. 3317 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3318 IdResolver.RemoveDecl(OrigNS); 3319 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3320 } 3321 } else if (PrevDecl) { 3322 // This is an invalid name redefinition. 3323 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3324 << Namespc->getDeclName(); 3325 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3326 Namespc->setInvalidDecl(); 3327 // Continue on to push Namespc as current DeclContext and return it. 3328 } else if (II->isStr("std") && 3329 CurContext->getLookupContext()->isTranslationUnit()) { 3330 // This is the first "real" definition of the namespace "std", so update 3331 // our cache of the "std" namespace to point at this definition. 3332 if (NamespaceDecl *StdNS = getStdNamespace()) { 3333 // We had already defined a dummy namespace "std". Link this new 3334 // namespace definition to the dummy namespace "std". 3335 StdNS->setNextNamespace(Namespc); 3336 StdNS->setLocation(IdentLoc); 3337 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3338 } 3339 3340 // Make our StdNamespace cache point at the first real definition of the 3341 // "std" namespace. 3342 StdNamespace = Namespc; 3343 } 3344 3345 PushOnScopeChains(Namespc, DeclRegionScope); 3346 } else { 3347 // Anonymous namespaces. 3348 assert(Namespc->isAnonymousNamespace()); 3349 3350 // Link the anonymous namespace into its parent. 3351 NamespaceDecl *PrevDecl; 3352 DeclContext *Parent = CurContext->getLookupContext(); 3353 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3354 PrevDecl = TU->getAnonymousNamespace(); 3355 TU->setAnonymousNamespace(Namespc); 3356 } else { 3357 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3358 PrevDecl = ND->getAnonymousNamespace(); 3359 ND->setAnonymousNamespace(Namespc); 3360 } 3361 3362 // Link the anonymous namespace with its previous declaration. 3363 if (PrevDecl) { 3364 assert(PrevDecl->isAnonymousNamespace()); 3365 assert(!PrevDecl->getNextNamespace()); 3366 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3367 PrevDecl->setNextNamespace(Namespc); 3368 } 3369 3370 CurContext->addDecl(Namespc); 3371 3372 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3373 // behaves as if it were replaced by 3374 // namespace unique { /* empty body */ } 3375 // using namespace unique; 3376 // namespace unique { namespace-body } 3377 // where all occurrences of 'unique' in a translation unit are 3378 // replaced by the same identifier and this identifier differs 3379 // from all other identifiers in the entire program. 3380 3381 // We just create the namespace with an empty name and then add an 3382 // implicit using declaration, just like the standard suggests. 3383 // 3384 // CodeGen enforces the "universally unique" aspect by giving all 3385 // declarations semantically contained within an anonymous 3386 // namespace internal linkage. 3387 3388 if (!PrevDecl) { 3389 UsingDirectiveDecl* UD 3390 = UsingDirectiveDecl::Create(Context, CurContext, 3391 /* 'using' */ LBrace, 3392 /* 'namespace' */ SourceLocation(), 3393 /* qualifier */ SourceRange(), 3394 /* NNS */ NULL, 3395 /* identifier */ SourceLocation(), 3396 Namespc, 3397 /* Ancestor */ CurContext); 3398 UD->setImplicit(); 3399 CurContext->addDecl(UD); 3400 } 3401 } 3402 3403 // Although we could have an invalid decl (i.e. the namespace name is a 3404 // redefinition), push it as current DeclContext and try to continue parsing. 3405 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3406 // for the namespace has the declarations that showed up in that particular 3407 // namespace definition. 3408 PushDeclContext(NamespcScope, Namespc); 3409 return DeclPtrTy::make(Namespc); 3410} 3411 3412/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3413/// is a namespace alias, returns the namespace it points to. 3414static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3415 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3416 return AD->getNamespace(); 3417 return dyn_cast_or_null<NamespaceDecl>(D); 3418} 3419 3420/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3421/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3422void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3423 Decl *Dcl = D.getAs<Decl>(); 3424 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3425 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3426 Namespc->setRBracLoc(RBrace); 3427 PopDeclContext(); 3428 if (Namespc->hasAttr<VisibilityAttr>()) 3429 PopPragmaVisibility(); 3430} 3431 3432/// \brief Retrieve the special "std" namespace, which may require us to 3433/// implicitly define the namespace. 3434NamespaceDecl *Sema::getOrCreateStdNamespace() { 3435 if (!StdNamespace) { 3436 // The "std" namespace has not yet been defined, so build one implicitly. 3437 StdNamespace = NamespaceDecl::Create(Context, 3438 Context.getTranslationUnitDecl(), 3439 SourceLocation(), 3440 &PP.getIdentifierTable().get("std")); 3441 getStdNamespace()->setImplicit(true); 3442 } 3443 3444 return getStdNamespace(); 3445} 3446 3447Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3448 SourceLocation UsingLoc, 3449 SourceLocation NamespcLoc, 3450 CXXScopeSpec &SS, 3451 SourceLocation IdentLoc, 3452 IdentifierInfo *NamespcName, 3453 AttributeList *AttrList) { 3454 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3455 assert(NamespcName && "Invalid NamespcName."); 3456 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3457 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3458 3459 UsingDirectiveDecl *UDir = 0; 3460 NestedNameSpecifier *Qualifier = 0; 3461 if (SS.isSet()) 3462 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3463 3464 // Lookup namespace name. 3465 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3466 LookupParsedName(R, S, &SS); 3467 if (R.isAmbiguous()) 3468 return DeclPtrTy(); 3469 3470 if (R.empty()) { 3471 // Allow "using namespace std;" or "using namespace ::std;" even if 3472 // "std" hasn't been defined yet, for GCC compatibility. 3473 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3474 NamespcName->isStr("std")) { 3475 Diag(IdentLoc, diag::ext_using_undefined_std); 3476 R.addDecl(getOrCreateStdNamespace()); 3477 R.resolveKind(); 3478 } 3479 // Otherwise, attempt typo correction. 3480 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3481 CTC_NoKeywords, 0)) { 3482 if (R.getAsSingle<NamespaceDecl>() || 3483 R.getAsSingle<NamespaceAliasDecl>()) { 3484 if (DeclContext *DC = computeDeclContext(SS, false)) 3485 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3486 << NamespcName << DC << Corrected << SS.getRange() 3487 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3488 else 3489 Diag(IdentLoc, diag::err_using_directive_suggest) 3490 << NamespcName << Corrected 3491 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3492 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3493 << Corrected; 3494 3495 NamespcName = Corrected.getAsIdentifierInfo(); 3496 } else { 3497 R.clear(); 3498 R.setLookupName(NamespcName); 3499 } 3500 } 3501 } 3502 3503 if (!R.empty()) { 3504 NamedDecl *Named = R.getFoundDecl(); 3505 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3506 && "expected namespace decl"); 3507 // C++ [namespace.udir]p1: 3508 // A using-directive specifies that the names in the nominated 3509 // namespace can be used in the scope in which the 3510 // using-directive appears after the using-directive. During 3511 // unqualified name lookup (3.4.1), the names appear as if they 3512 // were declared in the nearest enclosing namespace which 3513 // contains both the using-directive and the nominated 3514 // namespace. [Note: in this context, "contains" means "contains 3515 // directly or indirectly". ] 3516 3517 // Find enclosing context containing both using-directive and 3518 // nominated namespace. 3519 NamespaceDecl *NS = getNamespaceDecl(Named); 3520 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3521 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3522 CommonAncestor = CommonAncestor->getParent(); 3523 3524 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3525 SS.getRange(), 3526 (NestedNameSpecifier *)SS.getScopeRep(), 3527 IdentLoc, Named, CommonAncestor); 3528 PushUsingDirective(S, UDir); 3529 } else { 3530 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3531 } 3532 3533 // FIXME: We ignore attributes for now. 3534 delete AttrList; 3535 return DeclPtrTy::make(UDir); 3536} 3537 3538void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3539 // If scope has associated entity, then using directive is at namespace 3540 // or translation unit scope. We add UsingDirectiveDecls, into 3541 // it's lookup structure. 3542 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3543 Ctx->addDecl(UDir); 3544 else 3545 // Otherwise it is block-sope. using-directives will affect lookup 3546 // only to the end of scope. 3547 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3548} 3549 3550 3551Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3552 AccessSpecifier AS, 3553 bool HasUsingKeyword, 3554 SourceLocation UsingLoc, 3555 CXXScopeSpec &SS, 3556 UnqualifiedId &Name, 3557 AttributeList *AttrList, 3558 bool IsTypeName, 3559 SourceLocation TypenameLoc) { 3560 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3561 3562 switch (Name.getKind()) { 3563 case UnqualifiedId::IK_Identifier: 3564 case UnqualifiedId::IK_OperatorFunctionId: 3565 case UnqualifiedId::IK_LiteralOperatorId: 3566 case UnqualifiedId::IK_ConversionFunctionId: 3567 break; 3568 3569 case UnqualifiedId::IK_ConstructorName: 3570 case UnqualifiedId::IK_ConstructorTemplateId: 3571 // C++0x inherited constructors. 3572 if (getLangOptions().CPlusPlus0x) break; 3573 3574 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3575 << SS.getRange(); 3576 return DeclPtrTy(); 3577 3578 case UnqualifiedId::IK_DestructorName: 3579 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3580 << SS.getRange(); 3581 return DeclPtrTy(); 3582 3583 case UnqualifiedId::IK_TemplateId: 3584 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3585 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3586 return DeclPtrTy(); 3587 } 3588 3589 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3590 DeclarationName TargetName = TargetNameInfo.getName(); 3591 if (!TargetName) 3592 return DeclPtrTy(); 3593 3594 // Warn about using declarations. 3595 // TODO: store that the declaration was written without 'using' and 3596 // talk about access decls instead of using decls in the 3597 // diagnostics. 3598 if (!HasUsingKeyword) { 3599 UsingLoc = Name.getSourceRange().getBegin(); 3600 3601 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3602 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3603 } 3604 3605 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3606 TargetNameInfo, AttrList, 3607 /* IsInstantiation */ false, 3608 IsTypeName, TypenameLoc); 3609 if (UD) 3610 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3611 3612 return DeclPtrTy::make(UD); 3613} 3614 3615/// \brief Determine whether a using declaration considers the given 3616/// declarations as "equivalent", e.g., if they are redeclarations of 3617/// the same entity or are both typedefs of the same type. 3618static bool 3619IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3620 bool &SuppressRedeclaration) { 3621 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3622 SuppressRedeclaration = false; 3623 return true; 3624 } 3625 3626 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3627 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3628 SuppressRedeclaration = true; 3629 return Context.hasSameType(TD1->getUnderlyingType(), 3630 TD2->getUnderlyingType()); 3631 } 3632 3633 return false; 3634} 3635 3636 3637/// Determines whether to create a using shadow decl for a particular 3638/// decl, given the set of decls existing prior to this using lookup. 3639bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3640 const LookupResult &Previous) { 3641 // Diagnose finding a decl which is not from a base class of the 3642 // current class. We do this now because there are cases where this 3643 // function will silently decide not to build a shadow decl, which 3644 // will pre-empt further diagnostics. 3645 // 3646 // We don't need to do this in C++0x because we do the check once on 3647 // the qualifier. 3648 // 3649 // FIXME: diagnose the following if we care enough: 3650 // struct A { int foo; }; 3651 // struct B : A { using A::foo; }; 3652 // template <class T> struct C : A {}; 3653 // template <class T> struct D : C<T> { using B::foo; } // <--- 3654 // This is invalid (during instantiation) in C++03 because B::foo 3655 // resolves to the using decl in B, which is not a base class of D<T>. 3656 // We can't diagnose it immediately because C<T> is an unknown 3657 // specialization. The UsingShadowDecl in D<T> then points directly 3658 // to A::foo, which will look well-formed when we instantiate. 3659 // The right solution is to not collapse the shadow-decl chain. 3660 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3661 DeclContext *OrigDC = Orig->getDeclContext(); 3662 3663 // Handle enums and anonymous structs. 3664 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3665 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3666 while (OrigRec->isAnonymousStructOrUnion()) 3667 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3668 3669 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3670 if (OrigDC == CurContext) { 3671 Diag(Using->getLocation(), 3672 diag::err_using_decl_nested_name_specifier_is_current_class) 3673 << Using->getNestedNameRange(); 3674 Diag(Orig->getLocation(), diag::note_using_decl_target); 3675 return true; 3676 } 3677 3678 Diag(Using->getNestedNameRange().getBegin(), 3679 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3680 << Using->getTargetNestedNameDecl() 3681 << cast<CXXRecordDecl>(CurContext) 3682 << Using->getNestedNameRange(); 3683 Diag(Orig->getLocation(), diag::note_using_decl_target); 3684 return true; 3685 } 3686 } 3687 3688 if (Previous.empty()) return false; 3689 3690 NamedDecl *Target = Orig; 3691 if (isa<UsingShadowDecl>(Target)) 3692 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3693 3694 // If the target happens to be one of the previous declarations, we 3695 // don't have a conflict. 3696 // 3697 // FIXME: but we might be increasing its access, in which case we 3698 // should redeclare it. 3699 NamedDecl *NonTag = 0, *Tag = 0; 3700 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3701 I != E; ++I) { 3702 NamedDecl *D = (*I)->getUnderlyingDecl(); 3703 bool Result; 3704 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3705 return Result; 3706 3707 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3708 } 3709 3710 if (Target->isFunctionOrFunctionTemplate()) { 3711 FunctionDecl *FD; 3712 if (isa<FunctionTemplateDecl>(Target)) 3713 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3714 else 3715 FD = cast<FunctionDecl>(Target); 3716 3717 NamedDecl *OldDecl = 0; 3718 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3719 case Ovl_Overload: 3720 return false; 3721 3722 case Ovl_NonFunction: 3723 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3724 break; 3725 3726 // We found a decl with the exact signature. 3727 case Ovl_Match: 3728 // If we're in a record, we want to hide the target, so we 3729 // return true (without a diagnostic) to tell the caller not to 3730 // build a shadow decl. 3731 if (CurContext->isRecord()) 3732 return true; 3733 3734 // If we're not in a record, this is an error. 3735 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3736 break; 3737 } 3738 3739 Diag(Target->getLocation(), diag::note_using_decl_target); 3740 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3741 return true; 3742 } 3743 3744 // Target is not a function. 3745 3746 if (isa<TagDecl>(Target)) { 3747 // No conflict between a tag and a non-tag. 3748 if (!Tag) return false; 3749 3750 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3751 Diag(Target->getLocation(), diag::note_using_decl_target); 3752 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3753 return true; 3754 } 3755 3756 // No conflict between a tag and a non-tag. 3757 if (!NonTag) return false; 3758 3759 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3760 Diag(Target->getLocation(), diag::note_using_decl_target); 3761 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3762 return true; 3763} 3764 3765/// Builds a shadow declaration corresponding to a 'using' declaration. 3766UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3767 UsingDecl *UD, 3768 NamedDecl *Orig) { 3769 3770 // If we resolved to another shadow declaration, just coalesce them. 3771 NamedDecl *Target = Orig; 3772 if (isa<UsingShadowDecl>(Target)) { 3773 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3774 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3775 } 3776 3777 UsingShadowDecl *Shadow 3778 = UsingShadowDecl::Create(Context, CurContext, 3779 UD->getLocation(), UD, Target); 3780 UD->addShadowDecl(Shadow); 3781 3782 if (S) 3783 PushOnScopeChains(Shadow, S); 3784 else 3785 CurContext->addDecl(Shadow); 3786 Shadow->setAccess(UD->getAccess()); 3787 3788 // Register it as a conversion if appropriate. 3789 if (Shadow->getDeclName().getNameKind() 3790 == DeclarationName::CXXConversionFunctionName) 3791 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3792 3793 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3794 Shadow->setInvalidDecl(); 3795 3796 return Shadow; 3797} 3798 3799/// Hides a using shadow declaration. This is required by the current 3800/// using-decl implementation when a resolvable using declaration in a 3801/// class is followed by a declaration which would hide or override 3802/// one or more of the using decl's targets; for example: 3803/// 3804/// struct Base { void foo(int); }; 3805/// struct Derived : Base { 3806/// using Base::foo; 3807/// void foo(int); 3808/// }; 3809/// 3810/// The governing language is C++03 [namespace.udecl]p12: 3811/// 3812/// When a using-declaration brings names from a base class into a 3813/// derived class scope, member functions in the derived class 3814/// override and/or hide member functions with the same name and 3815/// parameter types in a base class (rather than conflicting). 3816/// 3817/// There are two ways to implement this: 3818/// (1) optimistically create shadow decls when they're not hidden 3819/// by existing declarations, or 3820/// (2) don't create any shadow decls (or at least don't make them 3821/// visible) until we've fully parsed/instantiated the class. 3822/// The problem with (1) is that we might have to retroactively remove 3823/// a shadow decl, which requires several O(n) operations because the 3824/// decl structures are (very reasonably) not designed for removal. 3825/// (2) avoids this but is very fiddly and phase-dependent. 3826void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3827 if (Shadow->getDeclName().getNameKind() == 3828 DeclarationName::CXXConversionFunctionName) 3829 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3830 3831 // Remove it from the DeclContext... 3832 Shadow->getDeclContext()->removeDecl(Shadow); 3833 3834 // ...and the scope, if applicable... 3835 if (S) { 3836 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3837 IdResolver.RemoveDecl(Shadow); 3838 } 3839 3840 // ...and the using decl. 3841 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3842 3843 // TODO: complain somehow if Shadow was used. It shouldn't 3844 // be possible for this to happen, because...? 3845} 3846 3847/// Builds a using declaration. 3848/// 3849/// \param IsInstantiation - Whether this call arises from an 3850/// instantiation of an unresolved using declaration. We treat 3851/// the lookup differently for these declarations. 3852NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3853 SourceLocation UsingLoc, 3854 CXXScopeSpec &SS, 3855 const DeclarationNameInfo &NameInfo, 3856 AttributeList *AttrList, 3857 bool IsInstantiation, 3858 bool IsTypeName, 3859 SourceLocation TypenameLoc) { 3860 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3861 SourceLocation IdentLoc = NameInfo.getLoc(); 3862 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3863 3864 // FIXME: We ignore attributes for now. 3865 delete AttrList; 3866 3867 if (SS.isEmpty()) { 3868 Diag(IdentLoc, diag::err_using_requires_qualname); 3869 return 0; 3870 } 3871 3872 // Do the redeclaration lookup in the current scope. 3873 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3874 ForRedeclaration); 3875 Previous.setHideTags(false); 3876 if (S) { 3877 LookupName(Previous, S); 3878 3879 // It is really dumb that we have to do this. 3880 LookupResult::Filter F = Previous.makeFilter(); 3881 while (F.hasNext()) { 3882 NamedDecl *D = F.next(); 3883 if (!isDeclInScope(D, CurContext, S)) 3884 F.erase(); 3885 } 3886 F.done(); 3887 } else { 3888 assert(IsInstantiation && "no scope in non-instantiation"); 3889 assert(CurContext->isRecord() && "scope not record in instantiation"); 3890 LookupQualifiedName(Previous, CurContext); 3891 } 3892 3893 NestedNameSpecifier *NNS = 3894 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3895 3896 // Check for invalid redeclarations. 3897 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3898 return 0; 3899 3900 // Check for bad qualifiers. 3901 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3902 return 0; 3903 3904 DeclContext *LookupContext = computeDeclContext(SS); 3905 NamedDecl *D; 3906 if (!LookupContext) { 3907 if (IsTypeName) { 3908 // FIXME: not all declaration name kinds are legal here 3909 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3910 UsingLoc, TypenameLoc, 3911 SS.getRange(), NNS, 3912 IdentLoc, NameInfo.getName()); 3913 } else { 3914 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3915 UsingLoc, SS.getRange(), 3916 NNS, NameInfo); 3917 } 3918 } else { 3919 D = UsingDecl::Create(Context, CurContext, 3920 SS.getRange(), UsingLoc, NNS, NameInfo, 3921 IsTypeName); 3922 } 3923 D->setAccess(AS); 3924 CurContext->addDecl(D); 3925 3926 if (!LookupContext) return D; 3927 UsingDecl *UD = cast<UsingDecl>(D); 3928 3929 if (RequireCompleteDeclContext(SS, LookupContext)) { 3930 UD->setInvalidDecl(); 3931 return UD; 3932 } 3933 3934 // Look up the target name. 3935 3936 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3937 3938 // Unlike most lookups, we don't always want to hide tag 3939 // declarations: tag names are visible through the using declaration 3940 // even if hidden by ordinary names, *except* in a dependent context 3941 // where it's important for the sanity of two-phase lookup. 3942 if (!IsInstantiation) 3943 R.setHideTags(false); 3944 3945 LookupQualifiedName(R, LookupContext); 3946 3947 if (R.empty()) { 3948 Diag(IdentLoc, diag::err_no_member) 3949 << NameInfo.getName() << LookupContext << SS.getRange(); 3950 UD->setInvalidDecl(); 3951 return UD; 3952 } 3953 3954 if (R.isAmbiguous()) { 3955 UD->setInvalidDecl(); 3956 return UD; 3957 } 3958 3959 if (IsTypeName) { 3960 // If we asked for a typename and got a non-type decl, error out. 3961 if (!R.getAsSingle<TypeDecl>()) { 3962 Diag(IdentLoc, diag::err_using_typename_non_type); 3963 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3964 Diag((*I)->getUnderlyingDecl()->getLocation(), 3965 diag::note_using_decl_target); 3966 UD->setInvalidDecl(); 3967 return UD; 3968 } 3969 } else { 3970 // If we asked for a non-typename and we got a type, error out, 3971 // but only if this is an instantiation of an unresolved using 3972 // decl. Otherwise just silently find the type name. 3973 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3974 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3975 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3976 UD->setInvalidDecl(); 3977 return UD; 3978 } 3979 } 3980 3981 // C++0x N2914 [namespace.udecl]p6: 3982 // A using-declaration shall not name a namespace. 3983 if (R.getAsSingle<NamespaceDecl>()) { 3984 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3985 << SS.getRange(); 3986 UD->setInvalidDecl(); 3987 return UD; 3988 } 3989 3990 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3991 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3992 BuildUsingShadowDecl(S, UD, *I); 3993 } 3994 3995 return UD; 3996} 3997 3998/// Checks that the given using declaration is not an invalid 3999/// redeclaration. Note that this is checking only for the using decl 4000/// itself, not for any ill-formedness among the UsingShadowDecls. 4001bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4002 bool isTypeName, 4003 const CXXScopeSpec &SS, 4004 SourceLocation NameLoc, 4005 const LookupResult &Prev) { 4006 // C++03 [namespace.udecl]p8: 4007 // C++0x [namespace.udecl]p10: 4008 // A using-declaration is a declaration and can therefore be used 4009 // repeatedly where (and only where) multiple declarations are 4010 // allowed. 4011 // 4012 // That's in non-member contexts. 4013 if (!CurContext->getLookupContext()->isRecord()) 4014 return false; 4015 4016 NestedNameSpecifier *Qual 4017 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4018 4019 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4020 NamedDecl *D = *I; 4021 4022 bool DTypename; 4023 NestedNameSpecifier *DQual; 4024 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4025 DTypename = UD->isTypeName(); 4026 DQual = UD->getTargetNestedNameDecl(); 4027 } else if (UnresolvedUsingValueDecl *UD 4028 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4029 DTypename = false; 4030 DQual = UD->getTargetNestedNameSpecifier(); 4031 } else if (UnresolvedUsingTypenameDecl *UD 4032 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4033 DTypename = true; 4034 DQual = UD->getTargetNestedNameSpecifier(); 4035 } else continue; 4036 4037 // using decls differ if one says 'typename' and the other doesn't. 4038 // FIXME: non-dependent using decls? 4039 if (isTypeName != DTypename) continue; 4040 4041 // using decls differ if they name different scopes (but note that 4042 // template instantiation can cause this check to trigger when it 4043 // didn't before instantiation). 4044 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4045 Context.getCanonicalNestedNameSpecifier(DQual)) 4046 continue; 4047 4048 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4049 Diag(D->getLocation(), diag::note_using_decl) << 1; 4050 return true; 4051 } 4052 4053 return false; 4054} 4055 4056 4057/// Checks that the given nested-name qualifier used in a using decl 4058/// in the current context is appropriately related to the current 4059/// scope. If an error is found, diagnoses it and returns true. 4060bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4061 const CXXScopeSpec &SS, 4062 SourceLocation NameLoc) { 4063 DeclContext *NamedContext = computeDeclContext(SS); 4064 4065 if (!CurContext->isRecord()) { 4066 // C++03 [namespace.udecl]p3: 4067 // C++0x [namespace.udecl]p8: 4068 // A using-declaration for a class member shall be a member-declaration. 4069 4070 // If we weren't able to compute a valid scope, it must be a 4071 // dependent class scope. 4072 if (!NamedContext || NamedContext->isRecord()) { 4073 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4074 << SS.getRange(); 4075 return true; 4076 } 4077 4078 // Otherwise, everything is known to be fine. 4079 return false; 4080 } 4081 4082 // The current scope is a record. 4083 4084 // If the named context is dependent, we can't decide much. 4085 if (!NamedContext) { 4086 // FIXME: in C++0x, we can diagnose if we can prove that the 4087 // nested-name-specifier does not refer to a base class, which is 4088 // still possible in some cases. 4089 4090 // Otherwise we have to conservatively report that things might be 4091 // okay. 4092 return false; 4093 } 4094 4095 if (!NamedContext->isRecord()) { 4096 // Ideally this would point at the last name in the specifier, 4097 // but we don't have that level of source info. 4098 Diag(SS.getRange().getBegin(), 4099 diag::err_using_decl_nested_name_specifier_is_not_class) 4100 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4101 return true; 4102 } 4103 4104 if (getLangOptions().CPlusPlus0x) { 4105 // C++0x [namespace.udecl]p3: 4106 // In a using-declaration used as a member-declaration, the 4107 // nested-name-specifier shall name a base class of the class 4108 // being defined. 4109 4110 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4111 cast<CXXRecordDecl>(NamedContext))) { 4112 if (CurContext == NamedContext) { 4113 Diag(NameLoc, 4114 diag::err_using_decl_nested_name_specifier_is_current_class) 4115 << SS.getRange(); 4116 return true; 4117 } 4118 4119 Diag(SS.getRange().getBegin(), 4120 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4121 << (NestedNameSpecifier*) SS.getScopeRep() 4122 << cast<CXXRecordDecl>(CurContext) 4123 << SS.getRange(); 4124 return true; 4125 } 4126 4127 return false; 4128 } 4129 4130 // C++03 [namespace.udecl]p4: 4131 // A using-declaration used as a member-declaration shall refer 4132 // to a member of a base class of the class being defined [etc.]. 4133 4134 // Salient point: SS doesn't have to name a base class as long as 4135 // lookup only finds members from base classes. Therefore we can 4136 // diagnose here only if we can prove that that can't happen, 4137 // i.e. if the class hierarchies provably don't intersect. 4138 4139 // TODO: it would be nice if "definitely valid" results were cached 4140 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4141 // need to be repeated. 4142 4143 struct UserData { 4144 llvm::DenseSet<const CXXRecordDecl*> Bases; 4145 4146 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4147 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4148 Data->Bases.insert(Base); 4149 return true; 4150 } 4151 4152 bool hasDependentBases(const CXXRecordDecl *Class) { 4153 return !Class->forallBases(collect, this); 4154 } 4155 4156 /// Returns true if the base is dependent or is one of the 4157 /// accumulated base classes. 4158 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4159 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4160 return !Data->Bases.count(Base); 4161 } 4162 4163 bool mightShareBases(const CXXRecordDecl *Class) { 4164 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4165 } 4166 }; 4167 4168 UserData Data; 4169 4170 // Returns false if we find a dependent base. 4171 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4172 return false; 4173 4174 // Returns false if the class has a dependent base or if it or one 4175 // of its bases is present in the base set of the current context. 4176 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4177 return false; 4178 4179 Diag(SS.getRange().getBegin(), 4180 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4181 << (NestedNameSpecifier*) SS.getScopeRep() 4182 << cast<CXXRecordDecl>(CurContext) 4183 << SS.getRange(); 4184 4185 return true; 4186} 4187 4188Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4189 SourceLocation NamespaceLoc, 4190 SourceLocation AliasLoc, 4191 IdentifierInfo *Alias, 4192 CXXScopeSpec &SS, 4193 SourceLocation IdentLoc, 4194 IdentifierInfo *Ident) { 4195 4196 // Lookup the namespace name. 4197 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4198 LookupParsedName(R, S, &SS); 4199 4200 // Check if we have a previous declaration with the same name. 4201 NamedDecl *PrevDecl 4202 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4203 ForRedeclaration); 4204 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4205 PrevDecl = 0; 4206 4207 if (PrevDecl) { 4208 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4209 // We already have an alias with the same name that points to the same 4210 // namespace, so don't create a new one. 4211 // FIXME: At some point, we'll want to create the (redundant) 4212 // declaration to maintain better source information. 4213 if (!R.isAmbiguous() && !R.empty() && 4214 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4215 return DeclPtrTy(); 4216 } 4217 4218 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4219 diag::err_redefinition_different_kind; 4220 Diag(AliasLoc, DiagID) << Alias; 4221 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4222 return DeclPtrTy(); 4223 } 4224 4225 if (R.isAmbiguous()) 4226 return DeclPtrTy(); 4227 4228 if (R.empty()) { 4229 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4230 CTC_NoKeywords, 0)) { 4231 if (R.getAsSingle<NamespaceDecl>() || 4232 R.getAsSingle<NamespaceAliasDecl>()) { 4233 if (DeclContext *DC = computeDeclContext(SS, false)) 4234 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4235 << Ident << DC << Corrected << SS.getRange() 4236 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4237 else 4238 Diag(IdentLoc, diag::err_using_directive_suggest) 4239 << Ident << Corrected 4240 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4241 4242 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4243 << Corrected; 4244 4245 Ident = Corrected.getAsIdentifierInfo(); 4246 } else { 4247 R.clear(); 4248 R.setLookupName(Ident); 4249 } 4250 } 4251 4252 if (R.empty()) { 4253 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4254 return DeclPtrTy(); 4255 } 4256 } 4257 4258 NamespaceAliasDecl *AliasDecl = 4259 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4260 Alias, SS.getRange(), 4261 (NestedNameSpecifier *)SS.getScopeRep(), 4262 IdentLoc, R.getFoundDecl()); 4263 4264 PushOnScopeChains(AliasDecl, S); 4265 return DeclPtrTy::make(AliasDecl); 4266} 4267 4268namespace { 4269 /// \brief Scoped object used to handle the state changes required in Sema 4270 /// to implicitly define the body of a C++ member function; 4271 class ImplicitlyDefinedFunctionScope { 4272 Sema &S; 4273 DeclContext *PreviousContext; 4274 4275 public: 4276 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4277 : S(S), PreviousContext(S.CurContext) 4278 { 4279 S.CurContext = Method; 4280 S.PushFunctionScope(); 4281 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4282 } 4283 4284 ~ImplicitlyDefinedFunctionScope() { 4285 S.PopExpressionEvaluationContext(); 4286 S.PopFunctionOrBlockScope(); 4287 S.CurContext = PreviousContext; 4288 } 4289 }; 4290} 4291 4292CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4293 CXXRecordDecl *ClassDecl) { 4294 // C++ [class.ctor]p5: 4295 // A default constructor for a class X is a constructor of class X 4296 // that can be called without an argument. If there is no 4297 // user-declared constructor for class X, a default constructor is 4298 // implicitly declared. An implicitly-declared default constructor 4299 // is an inline public member of its class. 4300 assert(!ClassDecl->hasUserDeclaredConstructor() && 4301 "Should not build implicit default constructor!"); 4302 4303 // C++ [except.spec]p14: 4304 // An implicitly declared special member function (Clause 12) shall have an 4305 // exception-specification. [...] 4306 ImplicitExceptionSpecification ExceptSpec(Context); 4307 4308 // Direct base-class destructors. 4309 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4310 BEnd = ClassDecl->bases_end(); 4311 B != BEnd; ++B) { 4312 if (B->isVirtual()) // Handled below. 4313 continue; 4314 4315 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4316 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4317 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4318 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4319 else if (CXXConstructorDecl *Constructor 4320 = BaseClassDecl->getDefaultConstructor()) 4321 ExceptSpec.CalledDecl(Constructor); 4322 } 4323 } 4324 4325 // Virtual base-class destructors. 4326 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4327 BEnd = ClassDecl->vbases_end(); 4328 B != BEnd; ++B) { 4329 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4330 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4331 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4332 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4333 else if (CXXConstructorDecl *Constructor 4334 = BaseClassDecl->getDefaultConstructor()) 4335 ExceptSpec.CalledDecl(Constructor); 4336 } 4337 } 4338 4339 // Field destructors. 4340 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4341 FEnd = ClassDecl->field_end(); 4342 F != FEnd; ++F) { 4343 if (const RecordType *RecordTy 4344 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4345 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4346 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4347 ExceptSpec.CalledDecl( 4348 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4349 else if (CXXConstructorDecl *Constructor 4350 = FieldClassDecl->getDefaultConstructor()) 4351 ExceptSpec.CalledDecl(Constructor); 4352 } 4353 } 4354 4355 4356 // Create the actual constructor declaration. 4357 CanQualType ClassType 4358 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4359 DeclarationName Name 4360 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4361 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4362 CXXConstructorDecl *DefaultCon 4363 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4364 Context.getFunctionType(Context.VoidTy, 4365 0, 0, false, 0, 4366 ExceptSpec.hasExceptionSpecification(), 4367 ExceptSpec.hasAnyExceptionSpecification(), 4368 ExceptSpec.size(), 4369 ExceptSpec.data(), 4370 FunctionType::ExtInfo()), 4371 /*TInfo=*/0, 4372 /*isExplicit=*/false, 4373 /*isInline=*/true, 4374 /*isImplicitlyDeclared=*/true); 4375 DefaultCon->setAccess(AS_public); 4376 DefaultCon->setImplicit(); 4377 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4378 4379 // Note that we have declared this constructor. 4380 ClassDecl->setDeclaredDefaultConstructor(true); 4381 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4382 4383 if (Scope *S = getScopeForContext(ClassDecl)) 4384 PushOnScopeChains(DefaultCon, S, false); 4385 ClassDecl->addDecl(DefaultCon); 4386 4387 return DefaultCon; 4388} 4389 4390void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4391 CXXConstructorDecl *Constructor) { 4392 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4393 !Constructor->isUsed(false)) && 4394 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4395 4396 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4397 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4398 4399 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4400 ErrorTrap Trap(*this); 4401 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4402 Trap.hasErrorOccurred()) { 4403 Diag(CurrentLocation, diag::note_member_synthesized_at) 4404 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4405 Constructor->setInvalidDecl(); 4406 } else { 4407 Constructor->setUsed(); 4408 MarkVTableUsed(CurrentLocation, ClassDecl); 4409 } 4410} 4411 4412CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4413 // C++ [class.dtor]p2: 4414 // If a class has no user-declared destructor, a destructor is 4415 // declared implicitly. An implicitly-declared destructor is an 4416 // inline public member of its class. 4417 4418 // C++ [except.spec]p14: 4419 // An implicitly declared special member function (Clause 12) shall have 4420 // an exception-specification. 4421 ImplicitExceptionSpecification ExceptSpec(Context); 4422 4423 // Direct base-class destructors. 4424 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4425 BEnd = ClassDecl->bases_end(); 4426 B != BEnd; ++B) { 4427 if (B->isVirtual()) // Handled below. 4428 continue; 4429 4430 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4431 ExceptSpec.CalledDecl( 4432 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4433 } 4434 4435 // Virtual base-class destructors. 4436 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4437 BEnd = ClassDecl->vbases_end(); 4438 B != BEnd; ++B) { 4439 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4440 ExceptSpec.CalledDecl( 4441 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4442 } 4443 4444 // Field destructors. 4445 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4446 FEnd = ClassDecl->field_end(); 4447 F != FEnd; ++F) { 4448 if (const RecordType *RecordTy 4449 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4450 ExceptSpec.CalledDecl( 4451 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4452 } 4453 4454 // Create the actual destructor declaration. 4455 QualType Ty = Context.getFunctionType(Context.VoidTy, 4456 0, 0, false, 0, 4457 ExceptSpec.hasExceptionSpecification(), 4458 ExceptSpec.hasAnyExceptionSpecification(), 4459 ExceptSpec.size(), 4460 ExceptSpec.data(), 4461 FunctionType::ExtInfo()); 4462 4463 CanQualType ClassType 4464 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4465 DeclarationName Name 4466 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4467 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4468 CXXDestructorDecl *Destructor 4469 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4470 /*isInline=*/true, 4471 /*isImplicitlyDeclared=*/true); 4472 Destructor->setAccess(AS_public); 4473 Destructor->setImplicit(); 4474 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4475 4476 // Note that we have declared this destructor. 4477 ClassDecl->setDeclaredDestructor(true); 4478 ++ASTContext::NumImplicitDestructorsDeclared; 4479 4480 // Introduce this destructor into its scope. 4481 if (Scope *S = getScopeForContext(ClassDecl)) 4482 PushOnScopeChains(Destructor, S, false); 4483 ClassDecl->addDecl(Destructor); 4484 4485 // This could be uniqued if it ever proves significant. 4486 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4487 4488 AddOverriddenMethods(ClassDecl, Destructor); 4489 4490 return Destructor; 4491} 4492 4493void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4494 CXXDestructorDecl *Destructor) { 4495 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4496 "DefineImplicitDestructor - call it for implicit default dtor"); 4497 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4498 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4499 4500 if (Destructor->isInvalidDecl()) 4501 return; 4502 4503 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4504 4505 ErrorTrap Trap(*this); 4506 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4507 Destructor->getParent()); 4508 4509 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4510 Diag(CurrentLocation, diag::note_member_synthesized_at) 4511 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4512 4513 Destructor->setInvalidDecl(); 4514 return; 4515 } 4516 4517 Destructor->setUsed(); 4518 MarkVTableUsed(CurrentLocation, ClassDecl); 4519} 4520 4521/// \brief Builds a statement that copies the given entity from \p From to 4522/// \c To. 4523/// 4524/// This routine is used to copy the members of a class with an 4525/// implicitly-declared copy assignment operator. When the entities being 4526/// copied are arrays, this routine builds for loops to copy them. 4527/// 4528/// \param S The Sema object used for type-checking. 4529/// 4530/// \param Loc The location where the implicit copy is being generated. 4531/// 4532/// \param T The type of the expressions being copied. Both expressions must 4533/// have this type. 4534/// 4535/// \param To The expression we are copying to. 4536/// 4537/// \param From The expression we are copying from. 4538/// 4539/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4540/// Otherwise, it's a non-static member subobject. 4541/// 4542/// \param Depth Internal parameter recording the depth of the recursion. 4543/// 4544/// \returns A statement or a loop that copies the expressions. 4545static Sema::OwningStmtResult 4546BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4547 Sema::OwningExprResult To, Sema::OwningExprResult From, 4548 bool CopyingBaseSubobject, unsigned Depth = 0) { 4549 typedef Sema::OwningStmtResult OwningStmtResult; 4550 typedef Sema::OwningExprResult OwningExprResult; 4551 4552 // C++0x [class.copy]p30: 4553 // Each subobject is assigned in the manner appropriate to its type: 4554 // 4555 // - if the subobject is of class type, the copy assignment operator 4556 // for the class is used (as if by explicit qualification; that is, 4557 // ignoring any possible virtual overriding functions in more derived 4558 // classes); 4559 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4560 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4561 4562 // Look for operator=. 4563 DeclarationName Name 4564 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4565 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4566 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4567 4568 // Filter out any result that isn't a copy-assignment operator. 4569 LookupResult::Filter F = OpLookup.makeFilter(); 4570 while (F.hasNext()) { 4571 NamedDecl *D = F.next(); 4572 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4573 if (Method->isCopyAssignmentOperator()) 4574 continue; 4575 4576 F.erase(); 4577 } 4578 F.done(); 4579 4580 // Suppress the protected check (C++ [class.protected]) for each of the 4581 // assignment operators we found. This strange dance is required when 4582 // we're assigning via a base classes's copy-assignment operator. To 4583 // ensure that we're getting the right base class subobject (without 4584 // ambiguities), we need to cast "this" to that subobject type; to 4585 // ensure that we don't go through the virtual call mechanism, we need 4586 // to qualify the operator= name with the base class (see below). However, 4587 // this means that if the base class has a protected copy assignment 4588 // operator, the protected member access check will fail. So, we 4589 // rewrite "protected" access to "public" access in this case, since we 4590 // know by construction that we're calling from a derived class. 4591 if (CopyingBaseSubobject) { 4592 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4593 L != LEnd; ++L) { 4594 if (L.getAccess() == AS_protected) 4595 L.setAccess(AS_public); 4596 } 4597 } 4598 4599 // Create the nested-name-specifier that will be used to qualify the 4600 // reference to operator=; this is required to suppress the virtual 4601 // call mechanism. 4602 CXXScopeSpec SS; 4603 SS.setRange(Loc); 4604 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4605 T.getTypePtr())); 4606 4607 // Create the reference to operator=. 4608 OwningExprResult OpEqualRef 4609 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4610 /*FirstQualifierInScope=*/0, OpLookup, 4611 /*TemplateArgs=*/0, 4612 /*SuppressQualifierCheck=*/true); 4613 if (OpEqualRef.isInvalid()) 4614 return S.StmtError(); 4615 4616 // Build the call to the assignment operator. 4617 Expr *FromE = From.takeAs<Expr>(); 4618 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4619 OpEqualRef.takeAs<Expr>(), 4620 Loc, &FromE, 1, 0, Loc); 4621 if (Call.isInvalid()) 4622 return S.StmtError(); 4623 4624 return S.Owned(Call.takeAs<Stmt>()); 4625 } 4626 4627 // - if the subobject is of scalar type, the built-in assignment 4628 // operator is used. 4629 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4630 if (!ArrayTy) { 4631 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4632 BinaryOperator::Assign, 4633 To.takeAs<Expr>(), 4634 From.takeAs<Expr>()); 4635 if (Assignment.isInvalid()) 4636 return S.StmtError(); 4637 4638 return S.Owned(Assignment.takeAs<Stmt>()); 4639 } 4640 4641 // - if the subobject is an array, each element is assigned, in the 4642 // manner appropriate to the element type; 4643 4644 // Construct a loop over the array bounds, e.g., 4645 // 4646 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4647 // 4648 // that will copy each of the array elements. 4649 QualType SizeType = S.Context.getSizeType(); 4650 4651 // Create the iteration variable. 4652 IdentifierInfo *IterationVarName = 0; 4653 { 4654 llvm::SmallString<8> Str; 4655 llvm::raw_svector_ostream OS(Str); 4656 OS << "__i" << Depth; 4657 IterationVarName = &S.Context.Idents.get(OS.str()); 4658 } 4659 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4660 IterationVarName, SizeType, 4661 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4662 VarDecl::None, VarDecl::None); 4663 4664 // Initialize the iteration variable to zero. 4665 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4666 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4667 4668 // Create a reference to the iteration variable; we'll use this several 4669 // times throughout. 4670 Expr *IterationVarRef 4671 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4672 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4673 4674 // Create the DeclStmt that holds the iteration variable. 4675 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4676 4677 // Create the comparison against the array bound. 4678 llvm::APInt Upper = ArrayTy->getSize(); 4679 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4680 OwningExprResult Comparison 4681 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4682 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4683 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4684 4685 // Create the pre-increment of the iteration variable. 4686 OwningExprResult Increment 4687 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4688 UnaryOperator::PreInc, 4689 SizeType, Loc)); 4690 4691 // Subscript the "from" and "to" expressions with the iteration variable. 4692 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4693 S.Owned(IterationVarRef->Retain()), 4694 Loc); 4695 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4696 S.Owned(IterationVarRef->Retain()), 4697 Loc); 4698 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4699 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4700 4701 // Build the copy for an individual element of the array. 4702 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4703 ArrayTy->getElementType(), 4704 move(To), move(From), 4705 CopyingBaseSubobject, Depth+1); 4706 if (Copy.isInvalid()) 4707 return S.StmtError(); 4708 4709 // Construct the loop that copies all elements of this array. 4710 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4711 S.MakeFullExpr(Comparison), 4712 Sema::DeclPtrTy(), 4713 S.MakeFullExpr(Increment), 4714 Loc, move(Copy)); 4715} 4716 4717/// \brief Determine whether the given class has a copy assignment operator 4718/// that accepts a const-qualified argument. 4719static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4720 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4721 4722 if (!Class->hasDeclaredCopyAssignment()) 4723 S.DeclareImplicitCopyAssignment(Class); 4724 4725 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4726 DeclarationName OpName 4727 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4728 4729 DeclContext::lookup_const_iterator Op, OpEnd; 4730 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4731 // C++ [class.copy]p9: 4732 // A user-declared copy assignment operator is a non-static non-template 4733 // member function of class X with exactly one parameter of type X, X&, 4734 // const X&, volatile X& or const volatile X&. 4735 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4736 if (!Method) 4737 continue; 4738 4739 if (Method->isStatic()) 4740 continue; 4741 if (Method->getPrimaryTemplate()) 4742 continue; 4743 const FunctionProtoType *FnType = 4744 Method->getType()->getAs<FunctionProtoType>(); 4745 assert(FnType && "Overloaded operator has no prototype."); 4746 // Don't assert on this; an invalid decl might have been left in the AST. 4747 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4748 continue; 4749 bool AcceptsConst = true; 4750 QualType ArgType = FnType->getArgType(0); 4751 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4752 ArgType = Ref->getPointeeType(); 4753 // Is it a non-const lvalue reference? 4754 if (!ArgType.isConstQualified()) 4755 AcceptsConst = false; 4756 } 4757 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4758 continue; 4759 4760 // We have a single argument of type cv X or cv X&, i.e. we've found the 4761 // copy assignment operator. Return whether it accepts const arguments. 4762 return AcceptsConst; 4763 } 4764 assert(Class->isInvalidDecl() && 4765 "No copy assignment operator declared in valid code."); 4766 return false; 4767} 4768 4769CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4770 // Note: The following rules are largely analoguous to the copy 4771 // constructor rules. Note that virtual bases are not taken into account 4772 // for determining the argument type of the operator. Note also that 4773 // operators taking an object instead of a reference are allowed. 4774 4775 4776 // C++ [class.copy]p10: 4777 // If the class definition does not explicitly declare a copy 4778 // assignment operator, one is declared implicitly. 4779 // The implicitly-defined copy assignment operator for a class X 4780 // will have the form 4781 // 4782 // X& X::operator=(const X&) 4783 // 4784 // if 4785 bool HasConstCopyAssignment = true; 4786 4787 // -- each direct base class B of X has a copy assignment operator 4788 // whose parameter is of type const B&, const volatile B& or B, 4789 // and 4790 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4791 BaseEnd = ClassDecl->bases_end(); 4792 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4793 assert(!Base->getType()->isDependentType() && 4794 "Cannot generate implicit members for class with dependent bases."); 4795 const CXXRecordDecl *BaseClassDecl 4796 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4797 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4798 } 4799 4800 // -- for all the nonstatic data members of X that are of a class 4801 // type M (or array thereof), each such class type has a copy 4802 // assignment operator whose parameter is of type const M&, 4803 // const volatile M& or M. 4804 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4805 FieldEnd = ClassDecl->field_end(); 4806 HasConstCopyAssignment && Field != FieldEnd; 4807 ++Field) { 4808 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4809 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4810 const CXXRecordDecl *FieldClassDecl 4811 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4812 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4813 } 4814 } 4815 4816 // Otherwise, the implicitly declared copy assignment operator will 4817 // have the form 4818 // 4819 // X& X::operator=(X&) 4820 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4821 QualType RetType = Context.getLValueReferenceType(ArgType); 4822 if (HasConstCopyAssignment) 4823 ArgType = ArgType.withConst(); 4824 ArgType = Context.getLValueReferenceType(ArgType); 4825 4826 // C++ [except.spec]p14: 4827 // An implicitly declared special member function (Clause 12) shall have an 4828 // exception-specification. [...] 4829 ImplicitExceptionSpecification ExceptSpec(Context); 4830 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4831 BaseEnd = ClassDecl->bases_end(); 4832 Base != BaseEnd; ++Base) { 4833 CXXRecordDecl *BaseClassDecl 4834 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4835 4836 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4837 DeclareImplicitCopyAssignment(BaseClassDecl); 4838 4839 if (CXXMethodDecl *CopyAssign 4840 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4841 ExceptSpec.CalledDecl(CopyAssign); 4842 } 4843 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4844 FieldEnd = ClassDecl->field_end(); 4845 Field != FieldEnd; 4846 ++Field) { 4847 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4848 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4849 CXXRecordDecl *FieldClassDecl 4850 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4851 4852 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4853 DeclareImplicitCopyAssignment(FieldClassDecl); 4854 4855 if (CXXMethodDecl *CopyAssign 4856 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4857 ExceptSpec.CalledDecl(CopyAssign); 4858 } 4859 } 4860 4861 // An implicitly-declared copy assignment operator is an inline public 4862 // member of its class. 4863 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4864 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4865 CXXMethodDecl *CopyAssignment 4866 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4867 Context.getFunctionType(RetType, &ArgType, 1, 4868 false, 0, 4869 ExceptSpec.hasExceptionSpecification(), 4870 ExceptSpec.hasAnyExceptionSpecification(), 4871 ExceptSpec.size(), 4872 ExceptSpec.data(), 4873 FunctionType::ExtInfo()), 4874 /*TInfo=*/0, /*isStatic=*/false, 4875 /*StorageClassAsWritten=*/FunctionDecl::None, 4876 /*isInline=*/true); 4877 CopyAssignment->setAccess(AS_public); 4878 CopyAssignment->setImplicit(); 4879 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4880 CopyAssignment->setCopyAssignment(true); 4881 4882 // Add the parameter to the operator. 4883 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4884 ClassDecl->getLocation(), 4885 /*Id=*/0, 4886 ArgType, /*TInfo=*/0, 4887 VarDecl::None, 4888 VarDecl::None, 0); 4889 CopyAssignment->setParams(&FromParam, 1); 4890 4891 // Note that we have added this copy-assignment operator. 4892 ClassDecl->setDeclaredCopyAssignment(true); 4893 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4894 4895 if (Scope *S = getScopeForContext(ClassDecl)) 4896 PushOnScopeChains(CopyAssignment, S, false); 4897 ClassDecl->addDecl(CopyAssignment); 4898 4899 AddOverriddenMethods(ClassDecl, CopyAssignment); 4900 return CopyAssignment; 4901} 4902 4903void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4904 CXXMethodDecl *CopyAssignOperator) { 4905 assert((CopyAssignOperator->isImplicit() && 4906 CopyAssignOperator->isOverloadedOperator() && 4907 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4908 !CopyAssignOperator->isUsed(false)) && 4909 "DefineImplicitCopyAssignment called for wrong function"); 4910 4911 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4912 4913 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4914 CopyAssignOperator->setInvalidDecl(); 4915 return; 4916 } 4917 4918 CopyAssignOperator->setUsed(); 4919 4920 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4921 ErrorTrap Trap(*this); 4922 4923 // C++0x [class.copy]p30: 4924 // The implicitly-defined or explicitly-defaulted copy assignment operator 4925 // for a non-union class X performs memberwise copy assignment of its 4926 // subobjects. The direct base classes of X are assigned first, in the 4927 // order of their declaration in the base-specifier-list, and then the 4928 // immediate non-static data members of X are assigned, in the order in 4929 // which they were declared in the class definition. 4930 4931 // The statements that form the synthesized function body. 4932 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4933 4934 // The parameter for the "other" object, which we are copying from. 4935 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4936 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4937 QualType OtherRefType = Other->getType(); 4938 if (const LValueReferenceType *OtherRef 4939 = OtherRefType->getAs<LValueReferenceType>()) { 4940 OtherRefType = OtherRef->getPointeeType(); 4941 OtherQuals = OtherRefType.getQualifiers(); 4942 } 4943 4944 // Our location for everything implicitly-generated. 4945 SourceLocation Loc = CopyAssignOperator->getLocation(); 4946 4947 // Construct a reference to the "other" object. We'll be using this 4948 // throughout the generated ASTs. 4949 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4950 assert(OtherRef && "Reference to parameter cannot fail!"); 4951 4952 // Construct the "this" pointer. We'll be using this throughout the generated 4953 // ASTs. 4954 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4955 assert(This && "Reference to this cannot fail!"); 4956 4957 // Assign base classes. 4958 bool Invalid = false; 4959 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4960 E = ClassDecl->bases_end(); Base != E; ++Base) { 4961 // Form the assignment: 4962 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4963 QualType BaseType = Base->getType().getUnqualifiedType(); 4964 CXXRecordDecl *BaseClassDecl = 0; 4965 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4966 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4967 else { 4968 Invalid = true; 4969 continue; 4970 } 4971 4972 CXXCastPath BasePath; 4973 BasePath.push_back(Base); 4974 4975 // Construct the "from" expression, which is an implicit cast to the 4976 // appropriately-qualified base type. 4977 Expr *From = OtherRef->Retain(); 4978 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4979 CastExpr::CK_UncheckedDerivedToBase, 4980 ImplicitCastExpr::LValue, &BasePath); 4981 4982 // Dereference "this". 4983 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4984 Owned(This->Retain())); 4985 4986 // Implicitly cast "this" to the appropriately-qualified base type. 4987 Expr *ToE = To.takeAs<Expr>(); 4988 ImpCastExprToType(ToE, 4989 Context.getCVRQualifiedType(BaseType, 4990 CopyAssignOperator->getTypeQualifiers()), 4991 CastExpr::CK_UncheckedDerivedToBase, 4992 ImplicitCastExpr::LValue, &BasePath); 4993 To = Owned(ToE); 4994 4995 // Build the copy. 4996 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4997 move(To), Owned(From), 4998 /*CopyingBaseSubobject=*/true); 4999 if (Copy.isInvalid()) { 5000 Diag(CurrentLocation, diag::note_member_synthesized_at) 5001 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5002 CopyAssignOperator->setInvalidDecl(); 5003 return; 5004 } 5005 5006 // Success! Record the copy. 5007 Statements.push_back(Copy.takeAs<Expr>()); 5008 } 5009 5010 // \brief Reference to the __builtin_memcpy function. 5011 Expr *BuiltinMemCpyRef = 0; 5012 // \brief Reference to the __builtin_objc_memmove_collectable function. 5013 Expr *CollectableMemCpyRef = 0; 5014 5015 // Assign non-static members. 5016 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5017 FieldEnd = ClassDecl->field_end(); 5018 Field != FieldEnd; ++Field) { 5019 // Check for members of reference type; we can't copy those. 5020 if (Field->getType()->isReferenceType()) { 5021 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5022 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5023 Diag(Field->getLocation(), diag::note_declared_at); 5024 Diag(CurrentLocation, diag::note_member_synthesized_at) 5025 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5026 Invalid = true; 5027 continue; 5028 } 5029 5030 // Check for members of const-qualified, non-class type. 5031 QualType BaseType = Context.getBaseElementType(Field->getType()); 5032 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5033 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5034 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5035 Diag(Field->getLocation(), diag::note_declared_at); 5036 Diag(CurrentLocation, diag::note_member_synthesized_at) 5037 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5038 Invalid = true; 5039 continue; 5040 } 5041 5042 QualType FieldType = Field->getType().getNonReferenceType(); 5043 if (FieldType->isIncompleteArrayType()) { 5044 assert(ClassDecl->hasFlexibleArrayMember() && 5045 "Incomplete array type is not valid"); 5046 continue; 5047 } 5048 5049 // Build references to the field in the object we're copying from and to. 5050 CXXScopeSpec SS; // Intentionally empty 5051 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5052 LookupMemberName); 5053 MemberLookup.addDecl(*Field); 5054 MemberLookup.resolveKind(); 5055 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 5056 OtherRefType, 5057 Loc, /*IsArrow=*/false, 5058 SS, 0, MemberLookup, 0); 5059 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 5060 This->getType(), 5061 Loc, /*IsArrow=*/true, 5062 SS, 0, MemberLookup, 0); 5063 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5064 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5065 5066 // If the field should be copied with __builtin_memcpy rather than via 5067 // explicit assignments, do so. This optimization only applies for arrays 5068 // of scalars and arrays of class type with trivial copy-assignment 5069 // operators. 5070 if (FieldType->isArrayType() && 5071 (!BaseType->isRecordType() || 5072 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5073 ->hasTrivialCopyAssignment())) { 5074 // Compute the size of the memory buffer to be copied. 5075 QualType SizeType = Context.getSizeType(); 5076 llvm::APInt Size(Context.getTypeSize(SizeType), 5077 Context.getTypeSizeInChars(BaseType).getQuantity()); 5078 for (const ConstantArrayType *Array 5079 = Context.getAsConstantArrayType(FieldType); 5080 Array; 5081 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5082 llvm::APInt ArraySize = Array->getSize(); 5083 ArraySize.zextOrTrunc(Size.getBitWidth()); 5084 Size *= ArraySize; 5085 } 5086 5087 // Take the address of the field references for "from" and "to". 5088 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 5089 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 5090 5091 bool NeedsCollectableMemCpy = 5092 (BaseType->isRecordType() && 5093 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5094 5095 if (NeedsCollectableMemCpy) { 5096 if (!CollectableMemCpyRef) { 5097 // Create a reference to the __builtin_objc_memmove_collectable function. 5098 LookupResult R(*this, 5099 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5100 Loc, LookupOrdinaryName); 5101 LookupName(R, TUScope, true); 5102 5103 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5104 if (!CollectableMemCpy) { 5105 // Something went horribly wrong earlier, and we will have 5106 // complained about it. 5107 Invalid = true; 5108 continue; 5109 } 5110 5111 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5112 CollectableMemCpy->getType(), 5113 Loc, 0).takeAs<Expr>(); 5114 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5115 } 5116 } 5117 // Create a reference to the __builtin_memcpy builtin function. 5118 else if (!BuiltinMemCpyRef) { 5119 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5120 LookupOrdinaryName); 5121 LookupName(R, TUScope, true); 5122 5123 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5124 if (!BuiltinMemCpy) { 5125 // Something went horribly wrong earlier, and we will have complained 5126 // about it. 5127 Invalid = true; 5128 continue; 5129 } 5130 5131 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5132 BuiltinMemCpy->getType(), 5133 Loc, 0).takeAs<Expr>(); 5134 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5135 } 5136 5137 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5138 CallArgs.push_back(To.takeAs<Expr>()); 5139 CallArgs.push_back(From.takeAs<Expr>()); 5140 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5141 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5142 Commas.push_back(Loc); 5143 Commas.push_back(Loc); 5144 OwningExprResult Call = ExprError(); 5145 if (NeedsCollectableMemCpy) 5146 Call = ActOnCallExpr(/*Scope=*/0, 5147 Owned(CollectableMemCpyRef->Retain()), 5148 Loc, move_arg(CallArgs), 5149 Commas.data(), Loc); 5150 else 5151 Call = ActOnCallExpr(/*Scope=*/0, 5152 Owned(BuiltinMemCpyRef->Retain()), 5153 Loc, move_arg(CallArgs), 5154 Commas.data(), Loc); 5155 5156 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5157 Statements.push_back(Call.takeAs<Expr>()); 5158 continue; 5159 } 5160 5161 // Build the copy of this field. 5162 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5163 move(To), move(From), 5164 /*CopyingBaseSubobject=*/false); 5165 if (Copy.isInvalid()) { 5166 Diag(CurrentLocation, diag::note_member_synthesized_at) 5167 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5168 CopyAssignOperator->setInvalidDecl(); 5169 return; 5170 } 5171 5172 // Success! Record the copy. 5173 Statements.push_back(Copy.takeAs<Stmt>()); 5174 } 5175 5176 if (!Invalid) { 5177 // Add a "return *this;" 5178 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5179 Owned(This->Retain())); 5180 5181 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5182 if (Return.isInvalid()) 5183 Invalid = true; 5184 else { 5185 Statements.push_back(Return.takeAs<Stmt>()); 5186 5187 if (Trap.hasErrorOccurred()) { 5188 Diag(CurrentLocation, diag::note_member_synthesized_at) 5189 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5190 Invalid = true; 5191 } 5192 } 5193 } 5194 5195 if (Invalid) { 5196 CopyAssignOperator->setInvalidDecl(); 5197 return; 5198 } 5199 5200 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5201 /*isStmtExpr=*/false); 5202 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5203 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5204} 5205 5206CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5207 CXXRecordDecl *ClassDecl) { 5208 // C++ [class.copy]p4: 5209 // If the class definition does not explicitly declare a copy 5210 // constructor, one is declared implicitly. 5211 5212 // C++ [class.copy]p5: 5213 // The implicitly-declared copy constructor for a class X will 5214 // have the form 5215 // 5216 // X::X(const X&) 5217 // 5218 // if 5219 bool HasConstCopyConstructor = true; 5220 5221 // -- each direct or virtual base class B of X has a copy 5222 // constructor whose first parameter is of type const B& or 5223 // const volatile B&, and 5224 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5225 BaseEnd = ClassDecl->bases_end(); 5226 HasConstCopyConstructor && Base != BaseEnd; 5227 ++Base) { 5228 // Virtual bases are handled below. 5229 if (Base->isVirtual()) 5230 continue; 5231 5232 CXXRecordDecl *BaseClassDecl 5233 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5234 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5235 DeclareImplicitCopyConstructor(BaseClassDecl); 5236 5237 HasConstCopyConstructor 5238 = BaseClassDecl->hasConstCopyConstructor(Context); 5239 } 5240 5241 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5242 BaseEnd = ClassDecl->vbases_end(); 5243 HasConstCopyConstructor && Base != BaseEnd; 5244 ++Base) { 5245 CXXRecordDecl *BaseClassDecl 5246 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5247 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5248 DeclareImplicitCopyConstructor(BaseClassDecl); 5249 5250 HasConstCopyConstructor 5251 = BaseClassDecl->hasConstCopyConstructor(Context); 5252 } 5253 5254 // -- for all the nonstatic data members of X that are of a 5255 // class type M (or array thereof), each such class type 5256 // has a copy constructor whose first parameter is of type 5257 // const M& or const volatile M&. 5258 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5259 FieldEnd = ClassDecl->field_end(); 5260 HasConstCopyConstructor && Field != FieldEnd; 5261 ++Field) { 5262 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5263 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5264 CXXRecordDecl *FieldClassDecl 5265 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5266 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5267 DeclareImplicitCopyConstructor(FieldClassDecl); 5268 5269 HasConstCopyConstructor 5270 = FieldClassDecl->hasConstCopyConstructor(Context); 5271 } 5272 } 5273 5274 // Otherwise, the implicitly declared copy constructor will have 5275 // the form 5276 // 5277 // X::X(X&) 5278 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5279 QualType ArgType = ClassType; 5280 if (HasConstCopyConstructor) 5281 ArgType = ArgType.withConst(); 5282 ArgType = Context.getLValueReferenceType(ArgType); 5283 5284 // C++ [except.spec]p14: 5285 // An implicitly declared special member function (Clause 12) shall have an 5286 // exception-specification. [...] 5287 ImplicitExceptionSpecification ExceptSpec(Context); 5288 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5289 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5290 BaseEnd = ClassDecl->bases_end(); 5291 Base != BaseEnd; 5292 ++Base) { 5293 // Virtual bases are handled below. 5294 if (Base->isVirtual()) 5295 continue; 5296 5297 CXXRecordDecl *BaseClassDecl 5298 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5299 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5300 DeclareImplicitCopyConstructor(BaseClassDecl); 5301 5302 if (CXXConstructorDecl *CopyConstructor 5303 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5304 ExceptSpec.CalledDecl(CopyConstructor); 5305 } 5306 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5307 BaseEnd = ClassDecl->vbases_end(); 5308 Base != BaseEnd; 5309 ++Base) { 5310 CXXRecordDecl *BaseClassDecl 5311 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5312 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5313 DeclareImplicitCopyConstructor(BaseClassDecl); 5314 5315 if (CXXConstructorDecl *CopyConstructor 5316 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5317 ExceptSpec.CalledDecl(CopyConstructor); 5318 } 5319 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5320 FieldEnd = ClassDecl->field_end(); 5321 Field != FieldEnd; 5322 ++Field) { 5323 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5324 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5325 CXXRecordDecl *FieldClassDecl 5326 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5327 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5328 DeclareImplicitCopyConstructor(FieldClassDecl); 5329 5330 if (CXXConstructorDecl *CopyConstructor 5331 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5332 ExceptSpec.CalledDecl(CopyConstructor); 5333 } 5334 } 5335 5336 // An implicitly-declared copy constructor is an inline public 5337 // member of its class. 5338 DeclarationName Name 5339 = Context.DeclarationNames.getCXXConstructorName( 5340 Context.getCanonicalType(ClassType)); 5341 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5342 CXXConstructorDecl *CopyConstructor 5343 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5344 Context.getFunctionType(Context.VoidTy, 5345 &ArgType, 1, 5346 false, 0, 5347 ExceptSpec.hasExceptionSpecification(), 5348 ExceptSpec.hasAnyExceptionSpecification(), 5349 ExceptSpec.size(), 5350 ExceptSpec.data(), 5351 FunctionType::ExtInfo()), 5352 /*TInfo=*/0, 5353 /*isExplicit=*/false, 5354 /*isInline=*/true, 5355 /*isImplicitlyDeclared=*/true); 5356 CopyConstructor->setAccess(AS_public); 5357 CopyConstructor->setImplicit(); 5358 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5359 5360 // Note that we have declared this constructor. 5361 ClassDecl->setDeclaredCopyConstructor(true); 5362 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5363 5364 // Add the parameter to the constructor. 5365 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5366 ClassDecl->getLocation(), 5367 /*IdentifierInfo=*/0, 5368 ArgType, /*TInfo=*/0, 5369 VarDecl::None, 5370 VarDecl::None, 0); 5371 CopyConstructor->setParams(&FromParam, 1); 5372 if (Scope *S = getScopeForContext(ClassDecl)) 5373 PushOnScopeChains(CopyConstructor, S, false); 5374 ClassDecl->addDecl(CopyConstructor); 5375 5376 return CopyConstructor; 5377} 5378 5379void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5380 CXXConstructorDecl *CopyConstructor, 5381 unsigned TypeQuals) { 5382 assert((CopyConstructor->isImplicit() && 5383 CopyConstructor->isCopyConstructor(TypeQuals) && 5384 !CopyConstructor->isUsed(false)) && 5385 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5386 5387 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5388 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5389 5390 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5391 ErrorTrap Trap(*this); 5392 5393 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5394 Trap.hasErrorOccurred()) { 5395 Diag(CurrentLocation, diag::note_member_synthesized_at) 5396 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5397 CopyConstructor->setInvalidDecl(); 5398 } else { 5399 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5400 CopyConstructor->getLocation(), 5401 MultiStmtArg(*this, 0, 0), 5402 /*isStmtExpr=*/false) 5403 .takeAs<Stmt>()); 5404 } 5405 5406 CopyConstructor->setUsed(); 5407} 5408 5409Sema::OwningExprResult 5410Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5411 CXXConstructorDecl *Constructor, 5412 MultiExprArg ExprArgs, 5413 bool RequiresZeroInit, 5414 CXXConstructExpr::ConstructionKind ConstructKind) { 5415 bool Elidable = false; 5416 5417 // C++0x [class.copy]p34: 5418 // When certain criteria are met, an implementation is allowed to 5419 // omit the copy/move construction of a class object, even if the 5420 // copy/move constructor and/or destructor for the object have 5421 // side effects. [...] 5422 // - when a temporary class object that has not been bound to a 5423 // reference (12.2) would be copied/moved to a class object 5424 // with the same cv-unqualified type, the copy/move operation 5425 // can be omitted by constructing the temporary object 5426 // directly into the target of the omitted copy/move 5427 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5428 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5429 Elidable = SubExpr->isTemporaryObject() && 5430 Context.hasSameUnqualifiedType(SubExpr->getType(), 5431 Context.getTypeDeclType(Constructor->getParent())); 5432 } 5433 5434 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5435 Elidable, move(ExprArgs), RequiresZeroInit, 5436 ConstructKind); 5437} 5438 5439/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5440/// including handling of its default argument expressions. 5441Sema::OwningExprResult 5442Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5443 CXXConstructorDecl *Constructor, bool Elidable, 5444 MultiExprArg ExprArgs, 5445 bool RequiresZeroInit, 5446 CXXConstructExpr::ConstructionKind ConstructKind) { 5447 unsigned NumExprs = ExprArgs.size(); 5448 Expr **Exprs = (Expr **)ExprArgs.release(); 5449 5450 MarkDeclarationReferenced(ConstructLoc, Constructor); 5451 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5452 Constructor, Elidable, Exprs, NumExprs, 5453 RequiresZeroInit, ConstructKind)); 5454} 5455 5456bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5457 CXXConstructorDecl *Constructor, 5458 MultiExprArg Exprs) { 5459 OwningExprResult TempResult = 5460 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5461 move(Exprs)); 5462 if (TempResult.isInvalid()) 5463 return true; 5464 5465 Expr *Temp = TempResult.takeAs<Expr>(); 5466 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5467 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5468 VD->setInit(Temp); 5469 5470 return false; 5471} 5472 5473void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5474 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5475 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5476 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5477 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5478 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5479 CheckDestructorAccess(VD->getLocation(), Destructor, 5480 PDiag(diag::err_access_dtor_var) 5481 << VD->getDeclName() 5482 << VD->getType()); 5483 5484 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5485 Diag(VD->getLocation(), diag::warn_global_destructor); 5486 } 5487} 5488 5489/// AddCXXDirectInitializerToDecl - This action is called immediately after 5490/// ActOnDeclarator, when a C++ direct initializer is present. 5491/// e.g: "int x(1);" 5492void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5493 SourceLocation LParenLoc, 5494 MultiExprArg Exprs, 5495 SourceLocation *CommaLocs, 5496 SourceLocation RParenLoc) { 5497 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5498 Decl *RealDecl = Dcl.getAs<Decl>(); 5499 5500 // If there is no declaration, there was an error parsing it. Just ignore 5501 // the initializer. 5502 if (RealDecl == 0) 5503 return; 5504 5505 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5506 if (!VDecl) { 5507 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5508 RealDecl->setInvalidDecl(); 5509 return; 5510 } 5511 5512 // We will represent direct-initialization similarly to copy-initialization: 5513 // int x(1); -as-> int x = 1; 5514 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5515 // 5516 // Clients that want to distinguish between the two forms, can check for 5517 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5518 // A major benefit is that clients that don't particularly care about which 5519 // exactly form was it (like the CodeGen) can handle both cases without 5520 // special case code. 5521 5522 // C++ 8.5p11: 5523 // The form of initialization (using parentheses or '=') is generally 5524 // insignificant, but does matter when the entity being initialized has a 5525 // class type. 5526 5527 if (!VDecl->getType()->isDependentType() && 5528 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5529 diag::err_typecheck_decl_incomplete_type)) { 5530 VDecl->setInvalidDecl(); 5531 return; 5532 } 5533 5534 // The variable can not have an abstract class type. 5535 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5536 diag::err_abstract_type_in_decl, 5537 AbstractVariableType)) 5538 VDecl->setInvalidDecl(); 5539 5540 const VarDecl *Def; 5541 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5542 Diag(VDecl->getLocation(), diag::err_redefinition) 5543 << VDecl->getDeclName(); 5544 Diag(Def->getLocation(), diag::note_previous_definition); 5545 VDecl->setInvalidDecl(); 5546 return; 5547 } 5548 5549 // If either the declaration has a dependent type or if any of the 5550 // expressions is type-dependent, we represent the initialization 5551 // via a ParenListExpr for later use during template instantiation. 5552 if (VDecl->getType()->isDependentType() || 5553 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5554 // Let clients know that initialization was done with a direct initializer. 5555 VDecl->setCXXDirectInitializer(true); 5556 5557 // Store the initialization expressions as a ParenListExpr. 5558 unsigned NumExprs = Exprs.size(); 5559 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5560 (Expr **)Exprs.release(), 5561 NumExprs, RParenLoc)); 5562 return; 5563 } 5564 5565 // Capture the variable that is being initialized and the style of 5566 // initialization. 5567 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5568 5569 // FIXME: Poor source location information. 5570 InitializationKind Kind 5571 = InitializationKind::CreateDirect(VDecl->getLocation(), 5572 LParenLoc, RParenLoc); 5573 5574 InitializationSequence InitSeq(*this, Entity, Kind, 5575 (Expr**)Exprs.get(), Exprs.size()); 5576 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5577 if (Result.isInvalid()) { 5578 VDecl->setInvalidDecl(); 5579 return; 5580 } 5581 5582 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5583 VDecl->setInit(Result.takeAs<Expr>()); 5584 VDecl->setCXXDirectInitializer(true); 5585 5586 if (!VDecl->isInvalidDecl() && 5587 !VDecl->getDeclContext()->isDependentContext() && 5588 VDecl->hasGlobalStorage() && 5589 !VDecl->getInit()->isConstantInitializer(Context, 5590 VDecl->getType()->isReferenceType())) 5591 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5592 << VDecl->getInit()->getSourceRange(); 5593 5594 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5595 FinalizeVarWithDestructor(VDecl, Record); 5596} 5597 5598/// \brief Given a constructor and the set of arguments provided for the 5599/// constructor, convert the arguments and add any required default arguments 5600/// to form a proper call to this constructor. 5601/// 5602/// \returns true if an error occurred, false otherwise. 5603bool 5604Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5605 MultiExprArg ArgsPtr, 5606 SourceLocation Loc, 5607 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5608 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5609 unsigned NumArgs = ArgsPtr.size(); 5610 Expr **Args = (Expr **)ArgsPtr.get(); 5611 5612 const FunctionProtoType *Proto 5613 = Constructor->getType()->getAs<FunctionProtoType>(); 5614 assert(Proto && "Constructor without a prototype?"); 5615 unsigned NumArgsInProto = Proto->getNumArgs(); 5616 5617 // If too few arguments are available, we'll fill in the rest with defaults. 5618 if (NumArgs < NumArgsInProto) 5619 ConvertedArgs.reserve(NumArgsInProto); 5620 else 5621 ConvertedArgs.reserve(NumArgs); 5622 5623 VariadicCallType CallType = 5624 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5625 llvm::SmallVector<Expr *, 8> AllArgs; 5626 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5627 Proto, 0, Args, NumArgs, AllArgs, 5628 CallType); 5629 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5630 ConvertedArgs.push_back(AllArgs[i]); 5631 return Invalid; 5632} 5633 5634static inline bool 5635CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5636 const FunctionDecl *FnDecl) { 5637 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5638 if (isa<NamespaceDecl>(DC)) { 5639 return SemaRef.Diag(FnDecl->getLocation(), 5640 diag::err_operator_new_delete_declared_in_namespace) 5641 << FnDecl->getDeclName(); 5642 } 5643 5644 if (isa<TranslationUnitDecl>(DC) && 5645 FnDecl->getStorageClass() == FunctionDecl::Static) { 5646 return SemaRef.Diag(FnDecl->getLocation(), 5647 diag::err_operator_new_delete_declared_static) 5648 << FnDecl->getDeclName(); 5649 } 5650 5651 return false; 5652} 5653 5654static inline bool 5655CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5656 CanQualType ExpectedResultType, 5657 CanQualType ExpectedFirstParamType, 5658 unsigned DependentParamTypeDiag, 5659 unsigned InvalidParamTypeDiag) { 5660 QualType ResultType = 5661 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5662 5663 // Check that the result type is not dependent. 5664 if (ResultType->isDependentType()) 5665 return SemaRef.Diag(FnDecl->getLocation(), 5666 diag::err_operator_new_delete_dependent_result_type) 5667 << FnDecl->getDeclName() << ExpectedResultType; 5668 5669 // Check that the result type is what we expect. 5670 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5671 return SemaRef.Diag(FnDecl->getLocation(), 5672 diag::err_operator_new_delete_invalid_result_type) 5673 << FnDecl->getDeclName() << ExpectedResultType; 5674 5675 // A function template must have at least 2 parameters. 5676 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5677 return SemaRef.Diag(FnDecl->getLocation(), 5678 diag::err_operator_new_delete_template_too_few_parameters) 5679 << FnDecl->getDeclName(); 5680 5681 // The function decl must have at least 1 parameter. 5682 if (FnDecl->getNumParams() == 0) 5683 return SemaRef.Diag(FnDecl->getLocation(), 5684 diag::err_operator_new_delete_too_few_parameters) 5685 << FnDecl->getDeclName(); 5686 5687 // Check the the first parameter type is not dependent. 5688 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5689 if (FirstParamType->isDependentType()) 5690 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5691 << FnDecl->getDeclName() << ExpectedFirstParamType; 5692 5693 // Check that the first parameter type is what we expect. 5694 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5695 ExpectedFirstParamType) 5696 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5697 << FnDecl->getDeclName() << ExpectedFirstParamType; 5698 5699 return false; 5700} 5701 5702static bool 5703CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5704 // C++ [basic.stc.dynamic.allocation]p1: 5705 // A program is ill-formed if an allocation function is declared in a 5706 // namespace scope other than global scope or declared static in global 5707 // scope. 5708 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5709 return true; 5710 5711 CanQualType SizeTy = 5712 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5713 5714 // C++ [basic.stc.dynamic.allocation]p1: 5715 // The return type shall be void*. The first parameter shall have type 5716 // std::size_t. 5717 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5718 SizeTy, 5719 diag::err_operator_new_dependent_param_type, 5720 diag::err_operator_new_param_type)) 5721 return true; 5722 5723 // C++ [basic.stc.dynamic.allocation]p1: 5724 // The first parameter shall not have an associated default argument. 5725 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5726 return SemaRef.Diag(FnDecl->getLocation(), 5727 diag::err_operator_new_default_arg) 5728 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5729 5730 return false; 5731} 5732 5733static bool 5734CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5735 // C++ [basic.stc.dynamic.deallocation]p1: 5736 // A program is ill-formed if deallocation functions are declared in a 5737 // namespace scope other than global scope or declared static in global 5738 // scope. 5739 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5740 return true; 5741 5742 // C++ [basic.stc.dynamic.deallocation]p2: 5743 // Each deallocation function shall return void and its first parameter 5744 // shall be void*. 5745 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5746 SemaRef.Context.VoidPtrTy, 5747 diag::err_operator_delete_dependent_param_type, 5748 diag::err_operator_delete_param_type)) 5749 return true; 5750 5751 return false; 5752} 5753 5754/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5755/// of this overloaded operator is well-formed. If so, returns false; 5756/// otherwise, emits appropriate diagnostics and returns true. 5757bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5758 assert(FnDecl && FnDecl->isOverloadedOperator() && 5759 "Expected an overloaded operator declaration"); 5760 5761 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5762 5763 // C++ [over.oper]p5: 5764 // The allocation and deallocation functions, operator new, 5765 // operator new[], operator delete and operator delete[], are 5766 // described completely in 3.7.3. The attributes and restrictions 5767 // found in the rest of this subclause do not apply to them unless 5768 // explicitly stated in 3.7.3. 5769 if (Op == OO_Delete || Op == OO_Array_Delete) 5770 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5771 5772 if (Op == OO_New || Op == OO_Array_New) 5773 return CheckOperatorNewDeclaration(*this, FnDecl); 5774 5775 // C++ [over.oper]p6: 5776 // An operator function shall either be a non-static member 5777 // function or be a non-member function and have at least one 5778 // parameter whose type is a class, a reference to a class, an 5779 // enumeration, or a reference to an enumeration. 5780 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5781 if (MethodDecl->isStatic()) 5782 return Diag(FnDecl->getLocation(), 5783 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5784 } else { 5785 bool ClassOrEnumParam = false; 5786 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5787 ParamEnd = FnDecl->param_end(); 5788 Param != ParamEnd; ++Param) { 5789 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5790 if (ParamType->isDependentType() || ParamType->isRecordType() || 5791 ParamType->isEnumeralType()) { 5792 ClassOrEnumParam = true; 5793 break; 5794 } 5795 } 5796 5797 if (!ClassOrEnumParam) 5798 return Diag(FnDecl->getLocation(), 5799 diag::err_operator_overload_needs_class_or_enum) 5800 << FnDecl->getDeclName(); 5801 } 5802 5803 // C++ [over.oper]p8: 5804 // An operator function cannot have default arguments (8.3.6), 5805 // except where explicitly stated below. 5806 // 5807 // Only the function-call operator allows default arguments 5808 // (C++ [over.call]p1). 5809 if (Op != OO_Call) { 5810 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5811 Param != FnDecl->param_end(); ++Param) { 5812 if ((*Param)->hasDefaultArg()) 5813 return Diag((*Param)->getLocation(), 5814 diag::err_operator_overload_default_arg) 5815 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5816 } 5817 } 5818 5819 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5820 { false, false, false } 5821#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5822 , { Unary, Binary, MemberOnly } 5823#include "clang/Basic/OperatorKinds.def" 5824 }; 5825 5826 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5827 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5828 bool MustBeMemberOperator = OperatorUses[Op][2]; 5829 5830 // C++ [over.oper]p8: 5831 // [...] Operator functions cannot have more or fewer parameters 5832 // than the number required for the corresponding operator, as 5833 // described in the rest of this subclause. 5834 unsigned NumParams = FnDecl->getNumParams() 5835 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5836 if (Op != OO_Call && 5837 ((NumParams == 1 && !CanBeUnaryOperator) || 5838 (NumParams == 2 && !CanBeBinaryOperator) || 5839 (NumParams < 1) || (NumParams > 2))) { 5840 // We have the wrong number of parameters. 5841 unsigned ErrorKind; 5842 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5843 ErrorKind = 2; // 2 -> unary or binary. 5844 } else if (CanBeUnaryOperator) { 5845 ErrorKind = 0; // 0 -> unary 5846 } else { 5847 assert(CanBeBinaryOperator && 5848 "All non-call overloaded operators are unary or binary!"); 5849 ErrorKind = 1; // 1 -> binary 5850 } 5851 5852 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5853 << FnDecl->getDeclName() << NumParams << ErrorKind; 5854 } 5855 5856 // Overloaded operators other than operator() cannot be variadic. 5857 if (Op != OO_Call && 5858 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5859 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5860 << FnDecl->getDeclName(); 5861 } 5862 5863 // Some operators must be non-static member functions. 5864 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5865 return Diag(FnDecl->getLocation(), 5866 diag::err_operator_overload_must_be_member) 5867 << FnDecl->getDeclName(); 5868 } 5869 5870 // C++ [over.inc]p1: 5871 // The user-defined function called operator++ implements the 5872 // prefix and postfix ++ operator. If this function is a member 5873 // function with no parameters, or a non-member function with one 5874 // parameter of class or enumeration type, it defines the prefix 5875 // increment operator ++ for objects of that type. If the function 5876 // is a member function with one parameter (which shall be of type 5877 // int) or a non-member function with two parameters (the second 5878 // of which shall be of type int), it defines the postfix 5879 // increment operator ++ for objects of that type. 5880 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5881 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5882 bool ParamIsInt = false; 5883 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5884 ParamIsInt = BT->getKind() == BuiltinType::Int; 5885 5886 if (!ParamIsInt) 5887 return Diag(LastParam->getLocation(), 5888 diag::err_operator_overload_post_incdec_must_be_int) 5889 << LastParam->getType() << (Op == OO_MinusMinus); 5890 } 5891 5892 // Notify the class if it got an assignment operator. 5893 if (Op == OO_Equal) { 5894 // Would have returned earlier otherwise. 5895 assert(isa<CXXMethodDecl>(FnDecl) && 5896 "Overloaded = not member, but not filtered."); 5897 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5898 Method->getParent()->addedAssignmentOperator(Context, Method); 5899 } 5900 5901 return false; 5902} 5903 5904/// CheckLiteralOperatorDeclaration - Check whether the declaration 5905/// of this literal operator function is well-formed. If so, returns 5906/// false; otherwise, emits appropriate diagnostics and returns true. 5907bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5908 DeclContext *DC = FnDecl->getDeclContext(); 5909 Decl::Kind Kind = DC->getDeclKind(); 5910 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5911 Kind != Decl::LinkageSpec) { 5912 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5913 << FnDecl->getDeclName(); 5914 return true; 5915 } 5916 5917 bool Valid = false; 5918 5919 // template <char...> type operator "" name() is the only valid template 5920 // signature, and the only valid signature with no parameters. 5921 if (FnDecl->param_size() == 0) { 5922 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5923 // Must have only one template parameter 5924 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5925 if (Params->size() == 1) { 5926 NonTypeTemplateParmDecl *PmDecl = 5927 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5928 5929 // The template parameter must be a char parameter pack. 5930 // FIXME: This test will always fail because non-type parameter packs 5931 // have not been implemented. 5932 if (PmDecl && PmDecl->isTemplateParameterPack() && 5933 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5934 Valid = true; 5935 } 5936 } 5937 } else { 5938 // Check the first parameter 5939 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5940 5941 QualType T = (*Param)->getType(); 5942 5943 // unsigned long long int, long double, and any character type are allowed 5944 // as the only parameters. 5945 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5946 Context.hasSameType(T, Context.LongDoubleTy) || 5947 Context.hasSameType(T, Context.CharTy) || 5948 Context.hasSameType(T, Context.WCharTy) || 5949 Context.hasSameType(T, Context.Char16Ty) || 5950 Context.hasSameType(T, Context.Char32Ty)) { 5951 if (++Param == FnDecl->param_end()) 5952 Valid = true; 5953 goto FinishedParams; 5954 } 5955 5956 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5957 const PointerType *PT = T->getAs<PointerType>(); 5958 if (!PT) 5959 goto FinishedParams; 5960 T = PT->getPointeeType(); 5961 if (!T.isConstQualified()) 5962 goto FinishedParams; 5963 T = T.getUnqualifiedType(); 5964 5965 // Move on to the second parameter; 5966 ++Param; 5967 5968 // If there is no second parameter, the first must be a const char * 5969 if (Param == FnDecl->param_end()) { 5970 if (Context.hasSameType(T, Context.CharTy)) 5971 Valid = true; 5972 goto FinishedParams; 5973 } 5974 5975 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5976 // are allowed as the first parameter to a two-parameter function 5977 if (!(Context.hasSameType(T, Context.CharTy) || 5978 Context.hasSameType(T, Context.WCharTy) || 5979 Context.hasSameType(T, Context.Char16Ty) || 5980 Context.hasSameType(T, Context.Char32Ty))) 5981 goto FinishedParams; 5982 5983 // The second and final parameter must be an std::size_t 5984 T = (*Param)->getType().getUnqualifiedType(); 5985 if (Context.hasSameType(T, Context.getSizeType()) && 5986 ++Param == FnDecl->param_end()) 5987 Valid = true; 5988 } 5989 5990 // FIXME: This diagnostic is absolutely terrible. 5991FinishedParams: 5992 if (!Valid) { 5993 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5994 << FnDecl->getDeclName(); 5995 return true; 5996 } 5997 5998 return false; 5999} 6000 6001/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6002/// linkage specification, including the language and (if present) 6003/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6004/// the location of the language string literal, which is provided 6005/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6006/// the '{' brace. Otherwise, this linkage specification does not 6007/// have any braces. 6008Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 6009 SourceLocation ExternLoc, 6010 SourceLocation LangLoc, 6011 llvm::StringRef Lang, 6012 SourceLocation LBraceLoc) { 6013 LinkageSpecDecl::LanguageIDs Language; 6014 if (Lang == "\"C\"") 6015 Language = LinkageSpecDecl::lang_c; 6016 else if (Lang == "\"C++\"") 6017 Language = LinkageSpecDecl::lang_cxx; 6018 else { 6019 Diag(LangLoc, diag::err_bad_language); 6020 return DeclPtrTy(); 6021 } 6022 6023 // FIXME: Add all the various semantics of linkage specifications 6024 6025 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6026 LangLoc, Language, 6027 LBraceLoc.isValid()); 6028 CurContext->addDecl(D); 6029 PushDeclContext(S, D); 6030 return DeclPtrTy::make(D); 6031} 6032 6033/// ActOnFinishLinkageSpecification - Complete the definition of 6034/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6035/// valid, it's the position of the closing '}' brace in a linkage 6036/// specification that uses braces. 6037Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 6038 DeclPtrTy LinkageSpec, 6039 SourceLocation RBraceLoc) { 6040 if (LinkageSpec) 6041 PopDeclContext(); 6042 return LinkageSpec; 6043} 6044 6045/// \brief Perform semantic analysis for the variable declaration that 6046/// occurs within a C++ catch clause, returning the newly-created 6047/// variable. 6048VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 6049 TypeSourceInfo *TInfo, 6050 IdentifierInfo *Name, 6051 SourceLocation Loc, 6052 SourceRange Range) { 6053 bool Invalid = false; 6054 6055 // Arrays and functions decay. 6056 if (ExDeclType->isArrayType()) 6057 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6058 else if (ExDeclType->isFunctionType()) 6059 ExDeclType = Context.getPointerType(ExDeclType); 6060 6061 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6062 // The exception-declaration shall not denote a pointer or reference to an 6063 // incomplete type, other than [cv] void*. 6064 // N2844 forbids rvalue references. 6065 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6066 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 6067 Invalid = true; 6068 } 6069 6070 // GCC allows catching pointers and references to incomplete types 6071 // as an extension; so do we, but we warn by default. 6072 6073 QualType BaseType = ExDeclType; 6074 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6075 unsigned DK = diag::err_catch_incomplete; 6076 bool IncompleteCatchIsInvalid = true; 6077 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6078 BaseType = Ptr->getPointeeType(); 6079 Mode = 1; 6080 DK = diag::ext_catch_incomplete_ptr; 6081 IncompleteCatchIsInvalid = false; 6082 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6083 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6084 BaseType = Ref->getPointeeType(); 6085 Mode = 2; 6086 DK = diag::ext_catch_incomplete_ref; 6087 IncompleteCatchIsInvalid = false; 6088 } 6089 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6090 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6091 IncompleteCatchIsInvalid) 6092 Invalid = true; 6093 6094 if (!Invalid && !ExDeclType->isDependentType() && 6095 RequireNonAbstractType(Loc, ExDeclType, 6096 diag::err_abstract_type_in_decl, 6097 AbstractVariableType)) 6098 Invalid = true; 6099 6100 // Only the non-fragile NeXT runtime currently supports C++ catches 6101 // of ObjC types, and no runtime supports catching ObjC types by value. 6102 if (!Invalid && getLangOptions().ObjC1) { 6103 QualType T = ExDeclType; 6104 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6105 T = RT->getPointeeType(); 6106 6107 if (T->isObjCObjectType()) { 6108 Diag(Loc, diag::err_objc_object_catch); 6109 Invalid = true; 6110 } else if (T->isObjCObjectPointerType()) { 6111 if (!getLangOptions().NeXTRuntime) { 6112 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6113 Invalid = true; 6114 } else if (!getLangOptions().ObjCNonFragileABI) { 6115 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6116 Invalid = true; 6117 } 6118 } 6119 } 6120 6121 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6122 Name, ExDeclType, TInfo, VarDecl::None, 6123 VarDecl::None); 6124 ExDecl->setExceptionVariable(true); 6125 6126 if (!Invalid) { 6127 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6128 // C++ [except.handle]p16: 6129 // The object declared in an exception-declaration or, if the 6130 // exception-declaration does not specify a name, a temporary (12.2) is 6131 // copy-initialized (8.5) from the exception object. [...] 6132 // The object is destroyed when the handler exits, after the destruction 6133 // of any automatic objects initialized within the handler. 6134 // 6135 // We just pretend to initialize the object with itself, then make sure 6136 // it can be destroyed later. 6137 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6138 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6139 Loc, ExDeclType, 0); 6140 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6141 SourceLocation()); 6142 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6143 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6144 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6145 if (Result.isInvalid()) 6146 Invalid = true; 6147 else 6148 FinalizeVarWithDestructor(ExDecl, RecordTy); 6149 } 6150 } 6151 6152 if (Invalid) 6153 ExDecl->setInvalidDecl(); 6154 6155 return ExDecl; 6156} 6157 6158/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6159/// handler. 6160Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6161 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6162 QualType ExDeclType = TInfo->getType(); 6163 6164 bool Invalid = D.isInvalidType(); 6165 IdentifierInfo *II = D.getIdentifier(); 6166 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6167 LookupOrdinaryName, 6168 ForRedeclaration)) { 6169 // The scope should be freshly made just for us. There is just no way 6170 // it contains any previous declaration. 6171 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6172 if (PrevDecl->isTemplateParameter()) { 6173 // Maybe we will complain about the shadowed template parameter. 6174 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6175 } 6176 } 6177 6178 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6179 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6180 << D.getCXXScopeSpec().getRange(); 6181 Invalid = true; 6182 } 6183 6184 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6185 D.getIdentifier(), 6186 D.getIdentifierLoc(), 6187 D.getDeclSpec().getSourceRange()); 6188 6189 if (Invalid) 6190 ExDecl->setInvalidDecl(); 6191 6192 // Add the exception declaration into this scope. 6193 if (II) 6194 PushOnScopeChains(ExDecl, S); 6195 else 6196 CurContext->addDecl(ExDecl); 6197 6198 ProcessDeclAttributes(S, ExDecl, D); 6199 return DeclPtrTy::make(ExDecl); 6200} 6201 6202Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6203 ExprArg assertexpr, 6204 ExprArg assertmessageexpr) { 6205 Expr *AssertExpr = (Expr *)assertexpr.get(); 6206 StringLiteral *AssertMessage = 6207 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6208 6209 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6210 llvm::APSInt Value(32); 6211 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6212 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6213 AssertExpr->getSourceRange(); 6214 return DeclPtrTy(); 6215 } 6216 6217 if (Value == 0) { 6218 Diag(AssertLoc, diag::err_static_assert_failed) 6219 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6220 } 6221 } 6222 6223 assertexpr.release(); 6224 assertmessageexpr.release(); 6225 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6226 AssertExpr, AssertMessage); 6227 6228 CurContext->addDecl(Decl); 6229 return DeclPtrTy::make(Decl); 6230} 6231 6232/// \brief Perform semantic analysis of the given friend type declaration. 6233/// 6234/// \returns A friend declaration that. 6235FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6236 TypeSourceInfo *TSInfo) { 6237 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6238 6239 QualType T = TSInfo->getType(); 6240 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6241 6242 if (!getLangOptions().CPlusPlus0x) { 6243 // C++03 [class.friend]p2: 6244 // An elaborated-type-specifier shall be used in a friend declaration 6245 // for a class.* 6246 // 6247 // * The class-key of the elaborated-type-specifier is required. 6248 if (!ActiveTemplateInstantiations.empty()) { 6249 // Do not complain about the form of friend template types during 6250 // template instantiation; we will already have complained when the 6251 // template was declared. 6252 } else if (!T->isElaboratedTypeSpecifier()) { 6253 // If we evaluated the type to a record type, suggest putting 6254 // a tag in front. 6255 if (const RecordType *RT = T->getAs<RecordType>()) { 6256 RecordDecl *RD = RT->getDecl(); 6257 6258 std::string InsertionText = std::string(" ") + RD->getKindName(); 6259 6260 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6261 << (unsigned) RD->getTagKind() 6262 << T 6263 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6264 InsertionText); 6265 } else { 6266 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6267 << T 6268 << SourceRange(FriendLoc, TypeRange.getEnd()); 6269 } 6270 } else if (T->getAs<EnumType>()) { 6271 Diag(FriendLoc, diag::ext_enum_friend) 6272 << T 6273 << SourceRange(FriendLoc, TypeRange.getEnd()); 6274 } 6275 } 6276 6277 // C++0x [class.friend]p3: 6278 // If the type specifier in a friend declaration designates a (possibly 6279 // cv-qualified) class type, that class is declared as a friend; otherwise, 6280 // the friend declaration is ignored. 6281 6282 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6283 // in [class.friend]p3 that we do not implement. 6284 6285 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6286} 6287 6288/// Handle a friend type declaration. This works in tandem with 6289/// ActOnTag. 6290/// 6291/// Notes on friend class templates: 6292/// 6293/// We generally treat friend class declarations as if they were 6294/// declaring a class. So, for example, the elaborated type specifier 6295/// in a friend declaration is required to obey the restrictions of a 6296/// class-head (i.e. no typedefs in the scope chain), template 6297/// parameters are required to match up with simple template-ids, &c. 6298/// However, unlike when declaring a template specialization, it's 6299/// okay to refer to a template specialization without an empty 6300/// template parameter declaration, e.g. 6301/// friend class A<T>::B<unsigned>; 6302/// We permit this as a special case; if there are any template 6303/// parameters present at all, require proper matching, i.e. 6304/// template <> template <class T> friend class A<int>::B; 6305Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6306 MultiTemplateParamsArg TempParams) { 6307 SourceLocation Loc = DS.getSourceRange().getBegin(); 6308 6309 assert(DS.isFriendSpecified()); 6310 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6311 6312 // Try to convert the decl specifier to a type. This works for 6313 // friend templates because ActOnTag never produces a ClassTemplateDecl 6314 // for a TUK_Friend. 6315 Declarator TheDeclarator(DS, Declarator::MemberContext); 6316 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6317 QualType T = TSI->getType(); 6318 if (TheDeclarator.isInvalidType()) 6319 return DeclPtrTy(); 6320 6321 // This is definitely an error in C++98. It's probably meant to 6322 // be forbidden in C++0x, too, but the specification is just 6323 // poorly written. 6324 // 6325 // The problem is with declarations like the following: 6326 // template <T> friend A<T>::foo; 6327 // where deciding whether a class C is a friend or not now hinges 6328 // on whether there exists an instantiation of A that causes 6329 // 'foo' to equal C. There are restrictions on class-heads 6330 // (which we declare (by fiat) elaborated friend declarations to 6331 // be) that makes this tractable. 6332 // 6333 // FIXME: handle "template <> friend class A<T>;", which 6334 // is possibly well-formed? Who even knows? 6335 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6336 Diag(Loc, diag::err_tagless_friend_type_template) 6337 << DS.getSourceRange(); 6338 return DeclPtrTy(); 6339 } 6340 6341 // C++98 [class.friend]p1: A friend of a class is a function 6342 // or class that is not a member of the class . . . 6343 // This is fixed in DR77, which just barely didn't make the C++03 6344 // deadline. It's also a very silly restriction that seriously 6345 // affects inner classes and which nobody else seems to implement; 6346 // thus we never diagnose it, not even in -pedantic. 6347 // 6348 // But note that we could warn about it: it's always useless to 6349 // friend one of your own members (it's not, however, worthless to 6350 // friend a member of an arbitrary specialization of your template). 6351 6352 Decl *D; 6353 if (unsigned NumTempParamLists = TempParams.size()) 6354 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6355 NumTempParamLists, 6356 (TemplateParameterList**) TempParams.release(), 6357 TSI, 6358 DS.getFriendSpecLoc()); 6359 else 6360 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6361 6362 if (!D) 6363 return DeclPtrTy(); 6364 6365 D->setAccess(AS_public); 6366 CurContext->addDecl(D); 6367 6368 return DeclPtrTy::make(D); 6369} 6370 6371Sema::DeclPtrTy 6372Sema::ActOnFriendFunctionDecl(Scope *S, 6373 Declarator &D, 6374 bool IsDefinition, 6375 MultiTemplateParamsArg TemplateParams) { 6376 const DeclSpec &DS = D.getDeclSpec(); 6377 6378 assert(DS.isFriendSpecified()); 6379 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6380 6381 SourceLocation Loc = D.getIdentifierLoc(); 6382 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6383 QualType T = TInfo->getType(); 6384 6385 // C++ [class.friend]p1 6386 // A friend of a class is a function or class.... 6387 // Note that this sees through typedefs, which is intended. 6388 // It *doesn't* see through dependent types, which is correct 6389 // according to [temp.arg.type]p3: 6390 // If a declaration acquires a function type through a 6391 // type dependent on a template-parameter and this causes 6392 // a declaration that does not use the syntactic form of a 6393 // function declarator to have a function type, the program 6394 // is ill-formed. 6395 if (!T->isFunctionType()) { 6396 Diag(Loc, diag::err_unexpected_friend); 6397 6398 // It might be worthwhile to try to recover by creating an 6399 // appropriate declaration. 6400 return DeclPtrTy(); 6401 } 6402 6403 // C++ [namespace.memdef]p3 6404 // - If a friend declaration in a non-local class first declares a 6405 // class or function, the friend class or function is a member 6406 // of the innermost enclosing namespace. 6407 // - The name of the friend is not found by simple name lookup 6408 // until a matching declaration is provided in that namespace 6409 // scope (either before or after the class declaration granting 6410 // friendship). 6411 // - If a friend function is called, its name may be found by the 6412 // name lookup that considers functions from namespaces and 6413 // classes associated with the types of the function arguments. 6414 // - When looking for a prior declaration of a class or a function 6415 // declared as a friend, scopes outside the innermost enclosing 6416 // namespace scope are not considered. 6417 6418 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6419 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6420 DeclarationName Name = NameInfo.getName(); 6421 assert(Name); 6422 6423 // The context we found the declaration in, or in which we should 6424 // create the declaration. 6425 DeclContext *DC; 6426 6427 // FIXME: handle local classes 6428 6429 // Recover from invalid scope qualifiers as if they just weren't there. 6430 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6431 ForRedeclaration); 6432 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6433 DC = computeDeclContext(ScopeQual); 6434 6435 // FIXME: handle dependent contexts 6436 if (!DC) return DeclPtrTy(); 6437 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6438 6439 LookupQualifiedName(Previous, DC); 6440 6441 // Ignore things found implicitly in the wrong scope. 6442 // TODO: better diagnostics for this case. Suggesting the right 6443 // qualified scope would be nice... 6444 LookupResult::Filter F = Previous.makeFilter(); 6445 while (F.hasNext()) { 6446 NamedDecl *D = F.next(); 6447 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6448 F.erase(); 6449 } 6450 F.done(); 6451 6452 if (Previous.empty()) { 6453 D.setInvalidType(); 6454 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6455 return DeclPtrTy(); 6456 } 6457 6458 // C++ [class.friend]p1: A friend of a class is a function or 6459 // class that is not a member of the class . . . 6460 if (DC->Equals(CurContext)) 6461 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6462 6463 // Otherwise walk out to the nearest namespace scope looking for matches. 6464 } else { 6465 // TODO: handle local class contexts. 6466 6467 DC = CurContext; 6468 while (true) { 6469 // Skip class contexts. If someone can cite chapter and verse 6470 // for this behavior, that would be nice --- it's what GCC and 6471 // EDG do, and it seems like a reasonable intent, but the spec 6472 // really only says that checks for unqualified existing 6473 // declarations should stop at the nearest enclosing namespace, 6474 // not that they should only consider the nearest enclosing 6475 // namespace. 6476 while (DC->isRecord()) 6477 DC = DC->getParent(); 6478 6479 LookupQualifiedName(Previous, DC); 6480 6481 // TODO: decide what we think about using declarations. 6482 if (!Previous.empty()) 6483 break; 6484 6485 if (DC->isFileContext()) break; 6486 DC = DC->getParent(); 6487 } 6488 6489 // C++ [class.friend]p1: A friend of a class is a function or 6490 // class that is not a member of the class . . . 6491 // C++0x changes this for both friend types and functions. 6492 // Most C++ 98 compilers do seem to give an error here, so 6493 // we do, too. 6494 if (!Previous.empty() && DC->Equals(CurContext) 6495 && !getLangOptions().CPlusPlus0x) 6496 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6497 } 6498 6499 if (DC->isFileContext()) { 6500 // This implies that it has to be an operator or function. 6501 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6502 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6503 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6504 Diag(Loc, diag::err_introducing_special_friend) << 6505 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6506 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6507 return DeclPtrTy(); 6508 } 6509 } 6510 6511 bool Redeclaration = false; 6512 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6513 move(TemplateParams), 6514 IsDefinition, 6515 Redeclaration); 6516 if (!ND) return DeclPtrTy(); 6517 6518 assert(ND->getDeclContext() == DC); 6519 assert(ND->getLexicalDeclContext() == CurContext); 6520 6521 // Add the function declaration to the appropriate lookup tables, 6522 // adjusting the redeclarations list as necessary. We don't 6523 // want to do this yet if the friending class is dependent. 6524 // 6525 // Also update the scope-based lookup if the target context's 6526 // lookup context is in lexical scope. 6527 if (!CurContext->isDependentContext()) { 6528 DC = DC->getLookupContext(); 6529 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6530 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6531 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6532 } 6533 6534 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6535 D.getIdentifierLoc(), ND, 6536 DS.getFriendSpecLoc()); 6537 FrD->setAccess(AS_public); 6538 CurContext->addDecl(FrD); 6539 6540 return DeclPtrTy::make(ND); 6541} 6542 6543void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6544 AdjustDeclIfTemplate(dcl); 6545 6546 Decl *Dcl = dcl.getAs<Decl>(); 6547 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6548 if (!Fn) { 6549 Diag(DelLoc, diag::err_deleted_non_function); 6550 return; 6551 } 6552 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6553 Diag(DelLoc, diag::err_deleted_decl_not_first); 6554 Diag(Prev->getLocation(), diag::note_previous_declaration); 6555 // If the declaration wasn't the first, we delete the function anyway for 6556 // recovery. 6557 } 6558 Fn->setDeleted(); 6559} 6560 6561static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6562 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6563 ++CI) { 6564 Stmt *SubStmt = *CI; 6565 if (!SubStmt) 6566 continue; 6567 if (isa<ReturnStmt>(SubStmt)) 6568 Self.Diag(SubStmt->getSourceRange().getBegin(), 6569 diag::err_return_in_constructor_handler); 6570 if (!isa<Expr>(SubStmt)) 6571 SearchForReturnInStmt(Self, SubStmt); 6572 } 6573} 6574 6575void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6576 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6577 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6578 SearchForReturnInStmt(*this, Handler); 6579 } 6580} 6581 6582bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6583 const CXXMethodDecl *Old) { 6584 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6585 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6586 6587 if (Context.hasSameType(NewTy, OldTy) || 6588 NewTy->isDependentType() || OldTy->isDependentType()) 6589 return false; 6590 6591 // Check if the return types are covariant 6592 QualType NewClassTy, OldClassTy; 6593 6594 /// Both types must be pointers or references to classes. 6595 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6596 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6597 NewClassTy = NewPT->getPointeeType(); 6598 OldClassTy = OldPT->getPointeeType(); 6599 } 6600 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6601 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6602 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6603 NewClassTy = NewRT->getPointeeType(); 6604 OldClassTy = OldRT->getPointeeType(); 6605 } 6606 } 6607 } 6608 6609 // The return types aren't either both pointers or references to a class type. 6610 if (NewClassTy.isNull()) { 6611 Diag(New->getLocation(), 6612 diag::err_different_return_type_for_overriding_virtual_function) 6613 << New->getDeclName() << NewTy << OldTy; 6614 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6615 6616 return true; 6617 } 6618 6619 // C++ [class.virtual]p6: 6620 // If the return type of D::f differs from the return type of B::f, the 6621 // class type in the return type of D::f shall be complete at the point of 6622 // declaration of D::f or shall be the class type D. 6623 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6624 if (!RT->isBeingDefined() && 6625 RequireCompleteType(New->getLocation(), NewClassTy, 6626 PDiag(diag::err_covariant_return_incomplete) 6627 << New->getDeclName())) 6628 return true; 6629 } 6630 6631 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6632 // Check if the new class derives from the old class. 6633 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6634 Diag(New->getLocation(), 6635 diag::err_covariant_return_not_derived) 6636 << New->getDeclName() << NewTy << OldTy; 6637 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6638 return true; 6639 } 6640 6641 // Check if we the conversion from derived to base is valid. 6642 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6643 diag::err_covariant_return_inaccessible_base, 6644 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6645 // FIXME: Should this point to the return type? 6646 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6647 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6648 return true; 6649 } 6650 } 6651 6652 // The qualifiers of the return types must be the same. 6653 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6654 Diag(New->getLocation(), 6655 diag::err_covariant_return_type_different_qualifications) 6656 << New->getDeclName() << NewTy << OldTy; 6657 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6658 return true; 6659 }; 6660 6661 6662 // The new class type must have the same or less qualifiers as the old type. 6663 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6664 Diag(New->getLocation(), 6665 diag::err_covariant_return_type_class_type_more_qualified) 6666 << New->getDeclName() << NewTy << OldTy; 6667 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6668 return true; 6669 }; 6670 6671 return false; 6672} 6673 6674bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6675 const CXXMethodDecl *Old) 6676{ 6677 if (Old->hasAttr<FinalAttr>()) { 6678 Diag(New->getLocation(), diag::err_final_function_overridden) 6679 << New->getDeclName(); 6680 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6681 return true; 6682 } 6683 6684 return false; 6685} 6686 6687/// \brief Mark the given method pure. 6688/// 6689/// \param Method the method to be marked pure. 6690/// 6691/// \param InitRange the source range that covers the "0" initializer. 6692bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6693 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6694 Method->setPure(); 6695 6696 // A class is abstract if at least one function is pure virtual. 6697 Method->getParent()->setAbstract(true); 6698 return false; 6699 } 6700 6701 if (!Method->isInvalidDecl()) 6702 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6703 << Method->getDeclName() << InitRange; 6704 return true; 6705} 6706 6707/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6708/// an initializer for the out-of-line declaration 'Dcl'. The scope 6709/// is a fresh scope pushed for just this purpose. 6710/// 6711/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6712/// static data member of class X, names should be looked up in the scope of 6713/// class X. 6714void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6715 // If there is no declaration, there was an error parsing it. 6716 Decl *D = Dcl.getAs<Decl>(); 6717 if (D == 0) return; 6718 6719 // We should only get called for declarations with scope specifiers, like: 6720 // int foo::bar; 6721 assert(D->isOutOfLine()); 6722 EnterDeclaratorContext(S, D->getDeclContext()); 6723} 6724 6725/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6726/// initializer for the out-of-line declaration 'Dcl'. 6727void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6728 // If there is no declaration, there was an error parsing it. 6729 Decl *D = Dcl.getAs<Decl>(); 6730 if (D == 0) return; 6731 6732 assert(D->isOutOfLine()); 6733 ExitDeclaratorContext(S); 6734} 6735 6736/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6737/// C++ if/switch/while/for statement. 6738/// e.g: "if (int x = f()) {...}" 6739Action::DeclResult 6740Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6741 // C++ 6.4p2: 6742 // The declarator shall not specify a function or an array. 6743 // The type-specifier-seq shall not contain typedef and shall not declare a 6744 // new class or enumeration. 6745 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6746 "Parser allowed 'typedef' as storage class of condition decl."); 6747 6748 TagDecl *OwnedTag = 0; 6749 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6750 QualType Ty = TInfo->getType(); 6751 6752 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6753 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6754 // would be created and CXXConditionDeclExpr wants a VarDecl. 6755 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6756 << D.getSourceRange(); 6757 return DeclResult(); 6758 } else if (OwnedTag && OwnedTag->isDefinition()) { 6759 // The type-specifier-seq shall not declare a new class or enumeration. 6760 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6761 } 6762 6763 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6764 if (!Dcl) 6765 return DeclResult(); 6766 6767 return Dcl; 6768} 6769 6770void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6771 bool DefinitionRequired) { 6772 // Ignore any vtable uses in unevaluated operands or for classes that do 6773 // not have a vtable. 6774 if (!Class->isDynamicClass() || Class->isDependentContext() || 6775 CurContext->isDependentContext() || 6776 ExprEvalContexts.back().Context == Unevaluated) 6777 return; 6778 6779 // Try to insert this class into the map. 6780 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6781 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6782 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6783 if (!Pos.second) { 6784 // If we already had an entry, check to see if we are promoting this vtable 6785 // to required a definition. If so, we need to reappend to the VTableUses 6786 // list, since we may have already processed the first entry. 6787 if (DefinitionRequired && !Pos.first->second) { 6788 Pos.first->second = true; 6789 } else { 6790 // Otherwise, we can early exit. 6791 return; 6792 } 6793 } 6794 6795 // Local classes need to have their virtual members marked 6796 // immediately. For all other classes, we mark their virtual members 6797 // at the end of the translation unit. 6798 if (Class->isLocalClass()) 6799 MarkVirtualMembersReferenced(Loc, Class); 6800 else 6801 VTableUses.push_back(std::make_pair(Class, Loc)); 6802} 6803 6804bool Sema::DefineUsedVTables() { 6805 // If any dynamic classes have their key function defined within 6806 // this translation unit, then those vtables are considered "used" and must 6807 // be emitted. 6808 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6809 if (const CXXMethodDecl *KeyFunction 6810 = Context.getKeyFunction(DynamicClasses[I])) { 6811 const FunctionDecl *Definition = 0; 6812 if (KeyFunction->hasBody(Definition)) 6813 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6814 } 6815 } 6816 6817 if (VTableUses.empty()) 6818 return false; 6819 6820 // Note: The VTableUses vector could grow as a result of marking 6821 // the members of a class as "used", so we check the size each 6822 // time through the loop and prefer indices (with are stable) to 6823 // iterators (which are not). 6824 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6825 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6826 if (!Class) 6827 continue; 6828 6829 SourceLocation Loc = VTableUses[I].second; 6830 6831 // If this class has a key function, but that key function is 6832 // defined in another translation unit, we don't need to emit the 6833 // vtable even though we're using it. 6834 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6835 if (KeyFunction && !KeyFunction->hasBody()) { 6836 switch (KeyFunction->getTemplateSpecializationKind()) { 6837 case TSK_Undeclared: 6838 case TSK_ExplicitSpecialization: 6839 case TSK_ExplicitInstantiationDeclaration: 6840 // The key function is in another translation unit. 6841 continue; 6842 6843 case TSK_ExplicitInstantiationDefinition: 6844 case TSK_ImplicitInstantiation: 6845 // We will be instantiating the key function. 6846 break; 6847 } 6848 } else if (!KeyFunction) { 6849 // If we have a class with no key function that is the subject 6850 // of an explicit instantiation declaration, suppress the 6851 // vtable; it will live with the explicit instantiation 6852 // definition. 6853 bool IsExplicitInstantiationDeclaration 6854 = Class->getTemplateSpecializationKind() 6855 == TSK_ExplicitInstantiationDeclaration; 6856 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6857 REnd = Class->redecls_end(); 6858 R != REnd; ++R) { 6859 TemplateSpecializationKind TSK 6860 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6861 if (TSK == TSK_ExplicitInstantiationDeclaration) 6862 IsExplicitInstantiationDeclaration = true; 6863 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6864 IsExplicitInstantiationDeclaration = false; 6865 break; 6866 } 6867 } 6868 6869 if (IsExplicitInstantiationDeclaration) 6870 continue; 6871 } 6872 6873 // Mark all of the virtual members of this class as referenced, so 6874 // that we can build a vtable. Then, tell the AST consumer that a 6875 // vtable for this class is required. 6876 MarkVirtualMembersReferenced(Loc, Class); 6877 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6878 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6879 6880 // Optionally warn if we're emitting a weak vtable. 6881 if (Class->getLinkage() == ExternalLinkage && 6882 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6883 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6884 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6885 } 6886 } 6887 VTableUses.clear(); 6888 6889 return true; 6890} 6891 6892void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6893 const CXXRecordDecl *RD) { 6894 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6895 e = RD->method_end(); i != e; ++i) { 6896 CXXMethodDecl *MD = *i; 6897 6898 // C++ [basic.def.odr]p2: 6899 // [...] A virtual member function is used if it is not pure. [...] 6900 if (MD->isVirtual() && !MD->isPure()) 6901 MarkDeclarationReferenced(Loc, MD); 6902 } 6903 6904 // Only classes that have virtual bases need a VTT. 6905 if (RD->getNumVBases() == 0) 6906 return; 6907 6908 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6909 e = RD->bases_end(); i != e; ++i) { 6910 const CXXRecordDecl *Base = 6911 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6912 if (Base->getNumVBases() == 0) 6913 continue; 6914 MarkVirtualMembersReferenced(Loc, Base); 6915 } 6916} 6917 6918/// SetIvarInitializers - This routine builds initialization ASTs for the 6919/// Objective-C implementation whose ivars need be initialized. 6920void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6921 if (!getLangOptions().CPlusPlus) 6922 return; 6923 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6924 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6925 CollectIvarsToConstructOrDestruct(OID, ivars); 6926 if (ivars.empty()) 6927 return; 6928 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6929 for (unsigned i = 0; i < ivars.size(); i++) { 6930 FieldDecl *Field = ivars[i]; 6931 if (Field->isInvalidDecl()) 6932 continue; 6933 6934 CXXBaseOrMemberInitializer *Member; 6935 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6936 InitializationKind InitKind = 6937 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6938 6939 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6940 Sema::OwningExprResult MemberInit = 6941 InitSeq.Perform(*this, InitEntity, InitKind, 6942 Sema::MultiExprArg(*this, 0, 0)); 6943 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6944 // Note, MemberInit could actually come back empty if no initialization 6945 // is required (e.g., because it would call a trivial default constructor) 6946 if (!MemberInit.get() || MemberInit.isInvalid()) 6947 continue; 6948 6949 Member = 6950 new (Context) CXXBaseOrMemberInitializer(Context, 6951 Field, SourceLocation(), 6952 SourceLocation(), 6953 MemberInit.takeAs<Expr>(), 6954 SourceLocation()); 6955 AllToInit.push_back(Member); 6956 6957 // Be sure that the destructor is accessible and is marked as referenced. 6958 if (const RecordType *RecordTy 6959 = Context.getBaseElementType(Field->getType()) 6960 ->getAs<RecordType>()) { 6961 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6962 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6963 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6964 CheckDestructorAccess(Field->getLocation(), Destructor, 6965 PDiag(diag::err_access_dtor_ivar) 6966 << Context.getBaseElementType(Field->getType())); 6967 } 6968 } 6969 } 6970 ObjCImplementation->setIvarInitializers(Context, 6971 AllToInit.data(), AllToInit.size()); 6972 } 6973} 6974