SemaDeclCXX.cpp revision e9c9d15ef9429257136564c5bab76dbe286e37c7
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 if (!Class->hasObjectMember()) { 626 if (const RecordType *FDTTy = 627 NewBaseType.getTypePtr()->getAs<RecordType>()) 628 if (FDTTy->getDecl()->hasObjectMember()) 629 Class->setHasObjectMember(true); 630 } 631 632 if (KnownBaseTypes[NewBaseType]) { 633 // C++ [class.mi]p3: 634 // A class shall not be specified as a direct base class of a 635 // derived class more than once. 636 Diag(Bases[idx]->getSourceRange().getBegin(), 637 diag::err_duplicate_base_class) 638 << KnownBaseTypes[NewBaseType]->getType() 639 << Bases[idx]->getSourceRange(); 640 641 // Delete the duplicate base class specifier; we're going to 642 // overwrite its pointer later. 643 Context.Deallocate(Bases[idx]); 644 645 Invalid = true; 646 } else { 647 // Okay, add this new base class. 648 KnownBaseTypes[NewBaseType] = Bases[idx]; 649 Bases[NumGoodBases++] = Bases[idx]; 650 } 651 } 652 653 // Attach the remaining base class specifiers to the derived class. 654 Class->setBases(Bases, NumGoodBases); 655 656 // Delete the remaining (good) base class specifiers, since their 657 // data has been copied into the CXXRecordDecl. 658 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 659 Context.Deallocate(Bases[idx]); 660 661 return Invalid; 662} 663 664/// ActOnBaseSpecifiers - Attach the given base specifiers to the 665/// class, after checking whether there are any duplicate base 666/// classes. 667void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 668 unsigned NumBases) { 669 if (!ClassDecl || !Bases || !NumBases) 670 return; 671 672 AdjustDeclIfTemplate(ClassDecl); 673 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 674 (CXXBaseSpecifier**)(Bases), NumBases); 675} 676 677static CXXRecordDecl *GetClassForType(QualType T) { 678 if (const RecordType *RT = T->getAs<RecordType>()) 679 return cast<CXXRecordDecl>(RT->getDecl()); 680 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 681 return ICT->getDecl(); 682 else 683 return 0; 684} 685 686/// \brief Determine whether the type \p Derived is a C++ class that is 687/// derived from the type \p Base. 688bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 689 if (!getLangOptions().CPlusPlus) 690 return false; 691 692 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 693 if (!DerivedRD) 694 return false; 695 696 CXXRecordDecl *BaseRD = GetClassForType(Base); 697 if (!BaseRD) 698 return false; 699 700 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 701 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 702} 703 704/// \brief Determine whether the type \p Derived is a C++ class that is 705/// derived from the type \p Base. 706bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 707 if (!getLangOptions().CPlusPlus) 708 return false; 709 710 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 711 if (!DerivedRD) 712 return false; 713 714 CXXRecordDecl *BaseRD = GetClassForType(Base); 715 if (!BaseRD) 716 return false; 717 718 return DerivedRD->isDerivedFrom(BaseRD, Paths); 719} 720 721void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 722 CXXBaseSpecifierArray &BasePathArray) { 723 assert(BasePathArray.empty() && "Base path array must be empty!"); 724 assert(Paths.isRecordingPaths() && "Must record paths!"); 725 726 const CXXBasePath &Path = Paths.front(); 727 728 // We first go backward and check if we have a virtual base. 729 // FIXME: It would be better if CXXBasePath had the base specifier for 730 // the nearest virtual base. 731 unsigned Start = 0; 732 for (unsigned I = Path.size(); I != 0; --I) { 733 if (Path[I - 1].Base->isVirtual()) { 734 Start = I - 1; 735 break; 736 } 737 } 738 739 // Now add all bases. 740 for (unsigned I = Start, E = Path.size(); I != E; ++I) 741 BasePathArray.push_back(Path[I].Base); 742} 743 744/// \brief Determine whether the given base path includes a virtual 745/// base class. 746bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 747 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 748 BEnd = BasePath.end(); 749 B != BEnd; ++B) 750 if ((*B)->isVirtual()) 751 return true; 752 753 return false; 754} 755 756/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 757/// conversion (where Derived and Base are class types) is 758/// well-formed, meaning that the conversion is unambiguous (and 759/// that all of the base classes are accessible). Returns true 760/// and emits a diagnostic if the code is ill-formed, returns false 761/// otherwise. Loc is the location where this routine should point to 762/// if there is an error, and Range is the source range to highlight 763/// if there is an error. 764bool 765Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 766 unsigned InaccessibleBaseID, 767 unsigned AmbigiousBaseConvID, 768 SourceLocation Loc, SourceRange Range, 769 DeclarationName Name, 770 CXXBaseSpecifierArray *BasePath) { 771 // First, determine whether the path from Derived to Base is 772 // ambiguous. This is slightly more expensive than checking whether 773 // the Derived to Base conversion exists, because here we need to 774 // explore multiple paths to determine if there is an ambiguity. 775 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 776 /*DetectVirtual=*/false); 777 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 778 assert(DerivationOkay && 779 "Can only be used with a derived-to-base conversion"); 780 (void)DerivationOkay; 781 782 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 783 if (InaccessibleBaseID) { 784 // Check that the base class can be accessed. 785 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 786 InaccessibleBaseID)) { 787 case AR_inaccessible: 788 return true; 789 case AR_accessible: 790 case AR_dependent: 791 case AR_delayed: 792 break; 793 } 794 } 795 796 // Build a base path if necessary. 797 if (BasePath) 798 BuildBasePathArray(Paths, *BasePath); 799 return false; 800 } 801 802 // We know that the derived-to-base conversion is ambiguous, and 803 // we're going to produce a diagnostic. Perform the derived-to-base 804 // search just one more time to compute all of the possible paths so 805 // that we can print them out. This is more expensive than any of 806 // the previous derived-to-base checks we've done, but at this point 807 // performance isn't as much of an issue. 808 Paths.clear(); 809 Paths.setRecordingPaths(true); 810 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 811 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 812 (void)StillOkay; 813 814 // Build up a textual representation of the ambiguous paths, e.g., 815 // D -> B -> A, that will be used to illustrate the ambiguous 816 // conversions in the diagnostic. We only print one of the paths 817 // to each base class subobject. 818 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 819 820 Diag(Loc, AmbigiousBaseConvID) 821 << Derived << Base << PathDisplayStr << Range << Name; 822 return true; 823} 824 825bool 826Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 827 SourceLocation Loc, SourceRange Range, 828 CXXBaseSpecifierArray *BasePath, 829 bool IgnoreAccess) { 830 return CheckDerivedToBaseConversion(Derived, Base, 831 IgnoreAccess ? 0 832 : diag::err_upcast_to_inaccessible_base, 833 diag::err_ambiguous_derived_to_base_conv, 834 Loc, Range, DeclarationName(), 835 BasePath); 836} 837 838 839/// @brief Builds a string representing ambiguous paths from a 840/// specific derived class to different subobjects of the same base 841/// class. 842/// 843/// This function builds a string that can be used in error messages 844/// to show the different paths that one can take through the 845/// inheritance hierarchy to go from the derived class to different 846/// subobjects of a base class. The result looks something like this: 847/// @code 848/// struct D -> struct B -> struct A 849/// struct D -> struct C -> struct A 850/// @endcode 851std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 852 std::string PathDisplayStr; 853 std::set<unsigned> DisplayedPaths; 854 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 855 Path != Paths.end(); ++Path) { 856 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 857 // We haven't displayed a path to this particular base 858 // class subobject yet. 859 PathDisplayStr += "\n "; 860 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 861 for (CXXBasePath::const_iterator Element = Path->begin(); 862 Element != Path->end(); ++Element) 863 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 864 } 865 } 866 867 return PathDisplayStr; 868} 869 870//===----------------------------------------------------------------------===// 871// C++ class member Handling 872//===----------------------------------------------------------------------===// 873 874/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 875Sema::DeclPtrTy 876Sema::ActOnAccessSpecifier(AccessSpecifier Access, 877 SourceLocation ASLoc, SourceLocation ColonLoc) { 878 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 879 AccessSpecDecl* ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 880 ASLoc, ColonLoc); 881 CurContext->addHiddenDecl(ASDecl); 882 return DeclPtrTy::make(ASDecl); 883} 884 885/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 886/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 887/// bitfield width if there is one and 'InitExpr' specifies the initializer if 888/// any. 889Sema::DeclPtrTy 890Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 891 MultiTemplateParamsArg TemplateParameterLists, 892 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 893 bool Deleted) { 894 const DeclSpec &DS = D.getDeclSpec(); 895 DeclarationName Name = GetNameForDeclarator(D); 896 Expr *BitWidth = static_cast<Expr*>(BW); 897 Expr *Init = static_cast<Expr*>(InitExpr); 898 SourceLocation Loc = D.getIdentifierLoc(); 899 900 assert(isa<CXXRecordDecl>(CurContext)); 901 assert(!DS.isFriendSpecified()); 902 903 bool isFunc = false; 904 if (D.isFunctionDeclarator()) 905 isFunc = true; 906 else if (D.getNumTypeObjects() == 0 && 907 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 908 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 909 isFunc = TDType->isFunctionType(); 910 } 911 912 // C++ 9.2p6: A member shall not be declared to have automatic storage 913 // duration (auto, register) or with the extern storage-class-specifier. 914 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 915 // data members and cannot be applied to names declared const or static, 916 // and cannot be applied to reference members. 917 switch (DS.getStorageClassSpec()) { 918 case DeclSpec::SCS_unspecified: 919 case DeclSpec::SCS_typedef: 920 case DeclSpec::SCS_static: 921 // FALL THROUGH. 922 break; 923 case DeclSpec::SCS_mutable: 924 if (isFunc) { 925 if (DS.getStorageClassSpecLoc().isValid()) 926 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 927 else 928 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 929 930 // FIXME: It would be nicer if the keyword was ignored only for this 931 // declarator. Otherwise we could get follow-up errors. 932 D.getMutableDeclSpec().ClearStorageClassSpecs(); 933 } 934 break; 935 default: 936 if (DS.getStorageClassSpecLoc().isValid()) 937 Diag(DS.getStorageClassSpecLoc(), 938 diag::err_storageclass_invalid_for_member); 939 else 940 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 941 D.getMutableDeclSpec().ClearStorageClassSpecs(); 942 } 943 944 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 945 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 946 !isFunc); 947 948 Decl *Member; 949 if (isInstField) { 950 // FIXME: Check for template parameters! 951 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 952 AS); 953 assert(Member && "HandleField never returns null"); 954 } else { 955 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 956 .getAs<Decl>(); 957 if (!Member) { 958 if (BitWidth) DeleteExpr(BitWidth); 959 return DeclPtrTy(); 960 } 961 962 // Non-instance-fields can't have a bitfield. 963 if (BitWidth) { 964 if (Member->isInvalidDecl()) { 965 // don't emit another diagnostic. 966 } else if (isa<VarDecl>(Member)) { 967 // C++ 9.6p3: A bit-field shall not be a static member. 968 // "static member 'A' cannot be a bit-field" 969 Diag(Loc, diag::err_static_not_bitfield) 970 << Name << BitWidth->getSourceRange(); 971 } else if (isa<TypedefDecl>(Member)) { 972 // "typedef member 'x' cannot be a bit-field" 973 Diag(Loc, diag::err_typedef_not_bitfield) 974 << Name << BitWidth->getSourceRange(); 975 } else { 976 // A function typedef ("typedef int f(); f a;"). 977 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 978 Diag(Loc, diag::err_not_integral_type_bitfield) 979 << Name << cast<ValueDecl>(Member)->getType() 980 << BitWidth->getSourceRange(); 981 } 982 983 DeleteExpr(BitWidth); 984 BitWidth = 0; 985 Member->setInvalidDecl(); 986 } 987 988 Member->setAccess(AS); 989 990 // If we have declared a member function template, set the access of the 991 // templated declaration as well. 992 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 993 FunTmpl->getTemplatedDecl()->setAccess(AS); 994 } 995 996 assert((Name || isInstField) && "No identifier for non-field ?"); 997 998 if (Init) 999 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1000 if (Deleted) // FIXME: Source location is not very good. 1001 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1002 1003 if (isInstField) { 1004 FieldCollector->Add(cast<FieldDecl>(Member)); 1005 return DeclPtrTy(); 1006 } 1007 return DeclPtrTy::make(Member); 1008} 1009 1010/// \brief Find the direct and/or virtual base specifiers that 1011/// correspond to the given base type, for use in base initialization 1012/// within a constructor. 1013static bool FindBaseInitializer(Sema &SemaRef, 1014 CXXRecordDecl *ClassDecl, 1015 QualType BaseType, 1016 const CXXBaseSpecifier *&DirectBaseSpec, 1017 const CXXBaseSpecifier *&VirtualBaseSpec) { 1018 // First, check for a direct base class. 1019 DirectBaseSpec = 0; 1020 for (CXXRecordDecl::base_class_const_iterator Base 1021 = ClassDecl->bases_begin(); 1022 Base != ClassDecl->bases_end(); ++Base) { 1023 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1024 // We found a direct base of this type. That's what we're 1025 // initializing. 1026 DirectBaseSpec = &*Base; 1027 break; 1028 } 1029 } 1030 1031 // Check for a virtual base class. 1032 // FIXME: We might be able to short-circuit this if we know in advance that 1033 // there are no virtual bases. 1034 VirtualBaseSpec = 0; 1035 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1036 // We haven't found a base yet; search the class hierarchy for a 1037 // virtual base class. 1038 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1039 /*DetectVirtual=*/false); 1040 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1041 BaseType, Paths)) { 1042 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1043 Path != Paths.end(); ++Path) { 1044 if (Path->back().Base->isVirtual()) { 1045 VirtualBaseSpec = Path->back().Base; 1046 break; 1047 } 1048 } 1049 } 1050 } 1051 1052 return DirectBaseSpec || VirtualBaseSpec; 1053} 1054 1055/// ActOnMemInitializer - Handle a C++ member initializer. 1056Sema::MemInitResult 1057Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1058 Scope *S, 1059 CXXScopeSpec &SS, 1060 IdentifierInfo *MemberOrBase, 1061 TypeTy *TemplateTypeTy, 1062 SourceLocation IdLoc, 1063 SourceLocation LParenLoc, 1064 ExprTy **Args, unsigned NumArgs, 1065 SourceLocation *CommaLocs, 1066 SourceLocation RParenLoc) { 1067 if (!ConstructorD) 1068 return true; 1069 1070 AdjustDeclIfTemplate(ConstructorD); 1071 1072 CXXConstructorDecl *Constructor 1073 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1074 if (!Constructor) { 1075 // The user wrote a constructor initializer on a function that is 1076 // not a C++ constructor. Ignore the error for now, because we may 1077 // have more member initializers coming; we'll diagnose it just 1078 // once in ActOnMemInitializers. 1079 return true; 1080 } 1081 1082 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1083 1084 // C++ [class.base.init]p2: 1085 // Names in a mem-initializer-id are looked up in the scope of the 1086 // constructor’s class and, if not found in that scope, are looked 1087 // up in the scope containing the constructor’s 1088 // definition. [Note: if the constructor’s class contains a member 1089 // with the same name as a direct or virtual base class of the 1090 // class, a mem-initializer-id naming the member or base class and 1091 // composed of a single identifier refers to the class member. A 1092 // mem-initializer-id for the hidden base class may be specified 1093 // using a qualified name. ] 1094 if (!SS.getScopeRep() && !TemplateTypeTy) { 1095 // Look for a member, first. 1096 FieldDecl *Member = 0; 1097 DeclContext::lookup_result Result 1098 = ClassDecl->lookup(MemberOrBase); 1099 if (Result.first != Result.second) 1100 Member = dyn_cast<FieldDecl>(*Result.first); 1101 1102 // FIXME: Handle members of an anonymous union. 1103 1104 if (Member) 1105 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1106 LParenLoc, RParenLoc); 1107 } 1108 // It didn't name a member, so see if it names a class. 1109 QualType BaseType; 1110 TypeSourceInfo *TInfo = 0; 1111 1112 if (TemplateTypeTy) { 1113 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1114 } else { 1115 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1116 LookupParsedName(R, S, &SS); 1117 1118 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1119 if (!TyD) { 1120 if (R.isAmbiguous()) return true; 1121 1122 // We don't want access-control diagnostics here. 1123 R.suppressDiagnostics(); 1124 1125 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1126 bool NotUnknownSpecialization = false; 1127 DeclContext *DC = computeDeclContext(SS, false); 1128 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1129 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1130 1131 if (!NotUnknownSpecialization) { 1132 // When the scope specifier can refer to a member of an unknown 1133 // specialization, we take it as a type name. 1134 BaseType = CheckTypenameType(ETK_None, 1135 (NestedNameSpecifier *)SS.getScopeRep(), 1136 *MemberOrBase, SourceLocation(), 1137 SS.getRange(), IdLoc); 1138 if (BaseType.isNull()) 1139 return true; 1140 1141 R.clear(); 1142 R.setLookupName(MemberOrBase); 1143 } 1144 } 1145 1146 // If no results were found, try to correct typos. 1147 if (R.empty() && BaseType.isNull() && 1148 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1149 R.isSingleResult()) { 1150 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1151 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1152 // We have found a non-static data member with a similar 1153 // name to what was typed; complain and initialize that 1154 // member. 1155 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1156 << MemberOrBase << true << R.getLookupName() 1157 << FixItHint::CreateReplacement(R.getNameLoc(), 1158 R.getLookupName().getAsString()); 1159 Diag(Member->getLocation(), diag::note_previous_decl) 1160 << Member->getDeclName(); 1161 1162 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1163 LParenLoc, RParenLoc); 1164 } 1165 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1166 const CXXBaseSpecifier *DirectBaseSpec; 1167 const CXXBaseSpecifier *VirtualBaseSpec; 1168 if (FindBaseInitializer(*this, ClassDecl, 1169 Context.getTypeDeclType(Type), 1170 DirectBaseSpec, VirtualBaseSpec)) { 1171 // We have found a direct or virtual base class with a 1172 // similar name to what was typed; complain and initialize 1173 // that base class. 1174 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1175 << MemberOrBase << false << R.getLookupName() 1176 << FixItHint::CreateReplacement(R.getNameLoc(), 1177 R.getLookupName().getAsString()); 1178 1179 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1180 : VirtualBaseSpec; 1181 Diag(BaseSpec->getSourceRange().getBegin(), 1182 diag::note_base_class_specified_here) 1183 << BaseSpec->getType() 1184 << BaseSpec->getSourceRange(); 1185 1186 TyD = Type; 1187 } 1188 } 1189 } 1190 1191 if (!TyD && BaseType.isNull()) { 1192 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1193 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1194 return true; 1195 } 1196 } 1197 1198 if (BaseType.isNull()) { 1199 BaseType = Context.getTypeDeclType(TyD); 1200 if (SS.isSet()) { 1201 NestedNameSpecifier *Qualifier = 1202 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1203 1204 // FIXME: preserve source range information 1205 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1206 } 1207 } 1208 } 1209 1210 if (!TInfo) 1211 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1212 1213 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1214 LParenLoc, RParenLoc, ClassDecl); 1215} 1216 1217/// Checks an initializer expression for use of uninitialized fields, such as 1218/// containing the field that is being initialized. Returns true if there is an 1219/// uninitialized field was used an updates the SourceLocation parameter; false 1220/// otherwise. 1221static bool InitExprContainsUninitializedFields(const Stmt *S, 1222 const FieldDecl *LhsField, 1223 SourceLocation *L) { 1224 if (isa<CallExpr>(S)) { 1225 // Do not descend into function calls or constructors, as the use 1226 // of an uninitialized field may be valid. One would have to inspect 1227 // the contents of the function/ctor to determine if it is safe or not. 1228 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1229 // may be safe, depending on what the function/ctor does. 1230 return false; 1231 } 1232 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1233 const NamedDecl *RhsField = ME->getMemberDecl(); 1234 if (RhsField == LhsField) { 1235 // Initializing a field with itself. Throw a warning. 1236 // But wait; there are exceptions! 1237 // Exception #1: The field may not belong to this record. 1238 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1239 const Expr *base = ME->getBase(); 1240 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1241 // Even though the field matches, it does not belong to this record. 1242 return false; 1243 } 1244 // None of the exceptions triggered; return true to indicate an 1245 // uninitialized field was used. 1246 *L = ME->getMemberLoc(); 1247 return true; 1248 } 1249 } 1250 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1251 it != e; ++it) { 1252 if (!*it) { 1253 // An expression such as 'member(arg ?: "")' may trigger this. 1254 continue; 1255 } 1256 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1257 return true; 1258 } 1259 return false; 1260} 1261 1262Sema::MemInitResult 1263Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1264 unsigned NumArgs, SourceLocation IdLoc, 1265 SourceLocation LParenLoc, 1266 SourceLocation RParenLoc) { 1267 // Diagnose value-uses of fields to initialize themselves, e.g. 1268 // foo(foo) 1269 // where foo is not also a parameter to the constructor. 1270 // TODO: implement -Wuninitialized and fold this into that framework. 1271 for (unsigned i = 0; i < NumArgs; ++i) { 1272 SourceLocation L; 1273 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1274 // FIXME: Return true in the case when other fields are used before being 1275 // uninitialized. For example, let this field be the i'th field. When 1276 // initializing the i'th field, throw a warning if any of the >= i'th 1277 // fields are used, as they are not yet initialized. 1278 // Right now we are only handling the case where the i'th field uses 1279 // itself in its initializer. 1280 Diag(L, diag::warn_field_is_uninit); 1281 } 1282 } 1283 1284 bool HasDependentArg = false; 1285 for (unsigned i = 0; i < NumArgs; i++) 1286 HasDependentArg |= Args[i]->isTypeDependent(); 1287 1288 QualType FieldType = Member->getType(); 1289 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1290 FieldType = Array->getElementType(); 1291 if (FieldType->isDependentType() || HasDependentArg) { 1292 // Can't check initialization for a member of dependent type or when 1293 // any of the arguments are type-dependent expressions. 1294 OwningExprResult Init 1295 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1296 RParenLoc)); 1297 1298 // Erase any temporaries within this evaluation context; we're not 1299 // going to track them in the AST, since we'll be rebuilding the 1300 // ASTs during template instantiation. 1301 ExprTemporaries.erase( 1302 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1303 ExprTemporaries.end()); 1304 1305 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1306 LParenLoc, 1307 Init.takeAs<Expr>(), 1308 RParenLoc); 1309 1310 } 1311 1312 if (Member->isInvalidDecl()) 1313 return true; 1314 1315 // Initialize the member. 1316 InitializedEntity MemberEntity = 1317 InitializedEntity::InitializeMember(Member, 0); 1318 InitializationKind Kind = 1319 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1320 1321 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1322 1323 OwningExprResult MemberInit = 1324 InitSeq.Perform(*this, MemberEntity, Kind, 1325 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1326 if (MemberInit.isInvalid()) 1327 return true; 1328 1329 // C++0x [class.base.init]p7: 1330 // The initialization of each base and member constitutes a 1331 // full-expression. 1332 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1333 if (MemberInit.isInvalid()) 1334 return true; 1335 1336 // If we are in a dependent context, template instantiation will 1337 // perform this type-checking again. Just save the arguments that we 1338 // received in a ParenListExpr. 1339 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1340 // of the information that we have about the member 1341 // initializer. However, deconstructing the ASTs is a dicey process, 1342 // and this approach is far more likely to get the corner cases right. 1343 if (CurContext->isDependentContext()) { 1344 // Bump the reference count of all of the arguments. 1345 for (unsigned I = 0; I != NumArgs; ++I) 1346 Args[I]->Retain(); 1347 1348 OwningExprResult Init 1349 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1350 RParenLoc)); 1351 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1352 LParenLoc, 1353 Init.takeAs<Expr>(), 1354 RParenLoc); 1355 } 1356 1357 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1358 LParenLoc, 1359 MemberInit.takeAs<Expr>(), 1360 RParenLoc); 1361} 1362 1363Sema::MemInitResult 1364Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1365 Expr **Args, unsigned NumArgs, 1366 SourceLocation LParenLoc, SourceLocation RParenLoc, 1367 CXXRecordDecl *ClassDecl) { 1368 bool HasDependentArg = false; 1369 for (unsigned i = 0; i < NumArgs; i++) 1370 HasDependentArg |= Args[i]->isTypeDependent(); 1371 1372 SourceLocation BaseLoc 1373 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1374 1375 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1376 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1377 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1378 1379 // C++ [class.base.init]p2: 1380 // [...] Unless the mem-initializer-id names a nonstatic data 1381 // member of the constructor’s class or a direct or virtual base 1382 // of that class, the mem-initializer is ill-formed. A 1383 // mem-initializer-list can initialize a base class using any 1384 // name that denotes that base class type. 1385 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1386 1387 // Check for direct and virtual base classes. 1388 const CXXBaseSpecifier *DirectBaseSpec = 0; 1389 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1390 if (!Dependent) { 1391 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1392 VirtualBaseSpec); 1393 1394 // C++ [base.class.init]p2: 1395 // Unless the mem-initializer-id names a nonstatic data member of the 1396 // constructor's class or a direct or virtual base of that class, the 1397 // mem-initializer is ill-formed. 1398 if (!DirectBaseSpec && !VirtualBaseSpec) { 1399 // If the class has any dependent bases, then it's possible that 1400 // one of those types will resolve to the same type as 1401 // BaseType. Therefore, just treat this as a dependent base 1402 // class initialization. FIXME: Should we try to check the 1403 // initialization anyway? It seems odd. 1404 if (ClassDecl->hasAnyDependentBases()) 1405 Dependent = true; 1406 else 1407 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1408 << BaseType << Context.getTypeDeclType(ClassDecl) 1409 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1410 } 1411 } 1412 1413 if (Dependent) { 1414 // Can't check initialization for a base of dependent type or when 1415 // any of the arguments are type-dependent expressions. 1416 OwningExprResult BaseInit 1417 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1418 RParenLoc)); 1419 1420 // Erase any temporaries within this evaluation context; we're not 1421 // going to track them in the AST, since we'll be rebuilding the 1422 // ASTs during template instantiation. 1423 ExprTemporaries.erase( 1424 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1425 ExprTemporaries.end()); 1426 1427 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1428 /*IsVirtual=*/false, 1429 LParenLoc, 1430 BaseInit.takeAs<Expr>(), 1431 RParenLoc); 1432 } 1433 1434 // C++ [base.class.init]p2: 1435 // If a mem-initializer-id is ambiguous because it designates both 1436 // a direct non-virtual base class and an inherited virtual base 1437 // class, the mem-initializer is ill-formed. 1438 if (DirectBaseSpec && VirtualBaseSpec) 1439 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1440 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1441 1442 CXXBaseSpecifier *BaseSpec 1443 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1444 if (!BaseSpec) 1445 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1446 1447 // Initialize the base. 1448 InitializedEntity BaseEntity = 1449 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1450 InitializationKind Kind = 1451 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1452 1453 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1454 1455 OwningExprResult BaseInit = 1456 InitSeq.Perform(*this, BaseEntity, Kind, 1457 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1458 if (BaseInit.isInvalid()) 1459 return true; 1460 1461 // C++0x [class.base.init]p7: 1462 // The initialization of each base and member constitutes a 1463 // full-expression. 1464 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1465 if (BaseInit.isInvalid()) 1466 return true; 1467 1468 // If we are in a dependent context, template instantiation will 1469 // perform this type-checking again. Just save the arguments that we 1470 // received in a ParenListExpr. 1471 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1472 // of the information that we have about the base 1473 // initializer. However, deconstructing the ASTs is a dicey process, 1474 // and this approach is far more likely to get the corner cases right. 1475 if (CurContext->isDependentContext()) { 1476 // Bump the reference count of all of the arguments. 1477 for (unsigned I = 0; I != NumArgs; ++I) 1478 Args[I]->Retain(); 1479 1480 OwningExprResult Init 1481 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1482 RParenLoc)); 1483 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1484 BaseSpec->isVirtual(), 1485 LParenLoc, 1486 Init.takeAs<Expr>(), 1487 RParenLoc); 1488 } 1489 1490 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1491 BaseSpec->isVirtual(), 1492 LParenLoc, 1493 BaseInit.takeAs<Expr>(), 1494 RParenLoc); 1495} 1496 1497/// ImplicitInitializerKind - How an implicit base or member initializer should 1498/// initialize its base or member. 1499enum ImplicitInitializerKind { 1500 IIK_Default, 1501 IIK_Copy, 1502 IIK_Move 1503}; 1504 1505static bool 1506BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1507 ImplicitInitializerKind ImplicitInitKind, 1508 CXXBaseSpecifier *BaseSpec, 1509 bool IsInheritedVirtualBase, 1510 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1511 InitializedEntity InitEntity 1512 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1513 IsInheritedVirtualBase); 1514 1515 Sema::OwningExprResult BaseInit(SemaRef); 1516 1517 switch (ImplicitInitKind) { 1518 case IIK_Default: { 1519 InitializationKind InitKind 1520 = InitializationKind::CreateDefault(Constructor->getLocation()); 1521 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1522 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1523 Sema::MultiExprArg(SemaRef, 0, 0)); 1524 break; 1525 } 1526 1527 case IIK_Copy: { 1528 ParmVarDecl *Param = Constructor->getParamDecl(0); 1529 QualType ParamType = Param->getType().getNonReferenceType(); 1530 1531 Expr *CopyCtorArg = 1532 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1533 Constructor->getLocation(), ParamType, 0); 1534 1535 // Cast to the base class to avoid ambiguities. 1536 QualType ArgTy = 1537 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1538 ParamType.getQualifiers()); 1539 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1540 CastExpr::CK_UncheckedDerivedToBase, 1541 /*isLvalue=*/true, 1542 CXXBaseSpecifierArray(BaseSpec)); 1543 1544 InitializationKind InitKind 1545 = InitializationKind::CreateDirect(Constructor->getLocation(), 1546 SourceLocation(), SourceLocation()); 1547 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1548 &CopyCtorArg, 1); 1549 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1550 Sema::MultiExprArg(SemaRef, 1551 (void**)&CopyCtorArg, 1)); 1552 break; 1553 } 1554 1555 case IIK_Move: 1556 assert(false && "Unhandled initializer kind!"); 1557 } 1558 1559 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1560 if (BaseInit.isInvalid()) 1561 return true; 1562 1563 CXXBaseInit = 1564 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1565 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1566 SourceLocation()), 1567 BaseSpec->isVirtual(), 1568 SourceLocation(), 1569 BaseInit.takeAs<Expr>(), 1570 SourceLocation()); 1571 1572 return false; 1573} 1574 1575static bool 1576BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1577 ImplicitInitializerKind ImplicitInitKind, 1578 FieldDecl *Field, 1579 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1580 if (Field->isInvalidDecl()) 1581 return true; 1582 1583 SourceLocation Loc = Constructor->getLocation(); 1584 1585 if (ImplicitInitKind == IIK_Copy) { 1586 ParmVarDecl *Param = Constructor->getParamDecl(0); 1587 QualType ParamType = Param->getType().getNonReferenceType(); 1588 1589 Expr *MemberExprBase = 1590 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1591 Loc, ParamType, 0); 1592 1593 // Build a reference to this field within the parameter. 1594 CXXScopeSpec SS; 1595 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1596 Sema::LookupMemberName); 1597 MemberLookup.addDecl(Field, AS_public); 1598 MemberLookup.resolveKind(); 1599 Sema::OwningExprResult CopyCtorArg 1600 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1601 ParamType, Loc, 1602 /*IsArrow=*/false, 1603 SS, 1604 /*FirstQualifierInScope=*/0, 1605 MemberLookup, 1606 /*TemplateArgs=*/0); 1607 if (CopyCtorArg.isInvalid()) 1608 return true; 1609 1610 // When the field we are copying is an array, create index variables for 1611 // each dimension of the array. We use these index variables to subscript 1612 // the source array, and other clients (e.g., CodeGen) will perform the 1613 // necessary iteration with these index variables. 1614 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1615 QualType BaseType = Field->getType(); 1616 QualType SizeType = SemaRef.Context.getSizeType(); 1617 while (const ConstantArrayType *Array 1618 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1619 // Create the iteration variable for this array index. 1620 IdentifierInfo *IterationVarName = 0; 1621 { 1622 llvm::SmallString<8> Str; 1623 llvm::raw_svector_ostream OS(Str); 1624 OS << "__i" << IndexVariables.size(); 1625 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1626 } 1627 VarDecl *IterationVar 1628 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1629 IterationVarName, SizeType, 1630 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1631 VarDecl::None, VarDecl::None); 1632 IndexVariables.push_back(IterationVar); 1633 1634 // Create a reference to the iteration variable. 1635 Sema::OwningExprResult IterationVarRef 1636 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1637 assert(!IterationVarRef.isInvalid() && 1638 "Reference to invented variable cannot fail!"); 1639 1640 // Subscript the array with this iteration variable. 1641 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1642 Loc, 1643 move(IterationVarRef), 1644 Loc); 1645 if (CopyCtorArg.isInvalid()) 1646 return true; 1647 1648 BaseType = Array->getElementType(); 1649 } 1650 1651 // Construct the entity that we will be initializing. For an array, this 1652 // will be first element in the array, which may require several levels 1653 // of array-subscript entities. 1654 llvm::SmallVector<InitializedEntity, 4> Entities; 1655 Entities.reserve(1 + IndexVariables.size()); 1656 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1657 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1658 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1659 0, 1660 Entities.back())); 1661 1662 // Direct-initialize to use the copy constructor. 1663 InitializationKind InitKind = 1664 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1665 1666 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1667 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1668 &CopyCtorArgE, 1); 1669 1670 Sema::OwningExprResult MemberInit 1671 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1672 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1673 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1674 if (MemberInit.isInvalid()) 1675 return true; 1676 1677 CXXMemberInit 1678 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1679 MemberInit.takeAs<Expr>(), Loc, 1680 IndexVariables.data(), 1681 IndexVariables.size()); 1682 return false; 1683 } 1684 1685 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1686 1687 QualType FieldBaseElementType = 1688 SemaRef.Context.getBaseElementType(Field->getType()); 1689 1690 if (FieldBaseElementType->isRecordType()) { 1691 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1692 InitializationKind InitKind = 1693 InitializationKind::CreateDefault(Loc); 1694 1695 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1696 Sema::OwningExprResult MemberInit = 1697 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1698 Sema::MultiExprArg(SemaRef, 0, 0)); 1699 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1700 if (MemberInit.isInvalid()) 1701 return true; 1702 1703 CXXMemberInit = 1704 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1705 Field, Loc, Loc, 1706 MemberInit.takeAs<Expr>(), 1707 Loc); 1708 return false; 1709 } 1710 1711 if (FieldBaseElementType->isReferenceType()) { 1712 SemaRef.Diag(Constructor->getLocation(), 1713 diag::err_uninitialized_member_in_ctor) 1714 << (int)Constructor->isImplicit() 1715 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1716 << 0 << Field->getDeclName(); 1717 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1718 return true; 1719 } 1720 1721 if (FieldBaseElementType.isConstQualified()) { 1722 SemaRef.Diag(Constructor->getLocation(), 1723 diag::err_uninitialized_member_in_ctor) 1724 << (int)Constructor->isImplicit() 1725 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1726 << 1 << Field->getDeclName(); 1727 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1728 return true; 1729 } 1730 1731 // Nothing to initialize. 1732 CXXMemberInit = 0; 1733 return false; 1734} 1735 1736namespace { 1737struct BaseAndFieldInfo { 1738 Sema &S; 1739 CXXConstructorDecl *Ctor; 1740 bool AnyErrorsInInits; 1741 ImplicitInitializerKind IIK; 1742 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1743 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1744 1745 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1746 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1747 // FIXME: Handle implicit move constructors. 1748 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1749 IIK = IIK_Copy; 1750 else 1751 IIK = IIK_Default; 1752 } 1753}; 1754} 1755 1756static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1757 FieldDecl *Top, FieldDecl *Field, 1758 CXXBaseOrMemberInitializer *Init) { 1759 // If the member doesn't need to be initialized, Init will still be null. 1760 if (!Init) 1761 return; 1762 1763 Info.AllToInit.push_back(Init); 1764 if (Field != Top) { 1765 Init->setMember(Top); 1766 Init->setAnonUnionMember(Field); 1767 } 1768} 1769 1770static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1771 FieldDecl *Top, FieldDecl *Field) { 1772 1773 // Overwhelmingly common case: we have a direct initializer for this field. 1774 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1775 RecordFieldInitializer(Info, Top, Field, Init); 1776 return false; 1777 } 1778 1779 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1780 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1781 assert(FieldClassType && "anonymous struct/union without record type"); 1782 CXXRecordDecl *FieldClassDecl 1783 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1784 1785 // Even though union members never have non-trivial default 1786 // constructions in C++03, we still build member initializers for aggregate 1787 // record types which can be union members, and C++0x allows non-trivial 1788 // default constructors for union members, so we ensure that only one 1789 // member is initialized for these. 1790 if (FieldClassDecl->isUnion()) { 1791 // First check for an explicit initializer for one field. 1792 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1793 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1794 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1795 RecordFieldInitializer(Info, Top, *FA, Init); 1796 break; 1797 } 1798 } 1799 1800 // Fallthrough and construct a default initializer for the union as 1801 // a whole, which can call its default constructor if such a thing exists 1802 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1803 // behavior going forward with C++0x, when anonymous unions there are 1804 // finalized, we should revisit this. 1805 } else { 1806 // For structs, we simply descend through to initialize all members where 1807 // necessary. 1808 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1809 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1810 if (CollectFieldInitializer(Info, Top, *FA)) 1811 return true; 1812 } 1813 } 1814 } 1815 1816 // Don't try to build an implicit initializer if there were semantic 1817 // errors in any of the initializers (and therefore we might be 1818 // missing some that the user actually wrote). 1819 if (Info.AnyErrorsInInits) 1820 return false; 1821 1822 CXXBaseOrMemberInitializer *Init = 0; 1823 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1824 return true; 1825 1826 RecordFieldInitializer(Info, Top, Field, Init); 1827 return false; 1828} 1829 1830bool 1831Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1832 CXXBaseOrMemberInitializer **Initializers, 1833 unsigned NumInitializers, 1834 bool AnyErrors) { 1835 if (Constructor->getDeclContext()->isDependentContext()) { 1836 // Just store the initializers as written, they will be checked during 1837 // instantiation. 1838 if (NumInitializers > 0) { 1839 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1840 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1841 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1842 memcpy(baseOrMemberInitializers, Initializers, 1843 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1844 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1845 } 1846 1847 return false; 1848 } 1849 1850 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1851 1852 // We need to build the initializer AST according to order of construction 1853 // and not what user specified in the Initializers list. 1854 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1855 if (!ClassDecl) 1856 return true; 1857 1858 bool HadError = false; 1859 1860 for (unsigned i = 0; i < NumInitializers; i++) { 1861 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1862 1863 if (Member->isBaseInitializer()) 1864 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1865 else 1866 Info.AllBaseFields[Member->getMember()] = Member; 1867 } 1868 1869 // Keep track of the direct virtual bases. 1870 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1871 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1872 E = ClassDecl->bases_end(); I != E; ++I) { 1873 if (I->isVirtual()) 1874 DirectVBases.insert(I); 1875 } 1876 1877 // Push virtual bases before others. 1878 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1879 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1880 1881 if (CXXBaseOrMemberInitializer *Value 1882 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1883 Info.AllToInit.push_back(Value); 1884 } else if (!AnyErrors) { 1885 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1886 CXXBaseOrMemberInitializer *CXXBaseInit; 1887 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1888 VBase, IsInheritedVirtualBase, 1889 CXXBaseInit)) { 1890 HadError = true; 1891 continue; 1892 } 1893 1894 Info.AllToInit.push_back(CXXBaseInit); 1895 } 1896 } 1897 1898 // Non-virtual bases. 1899 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1900 E = ClassDecl->bases_end(); Base != E; ++Base) { 1901 // Virtuals are in the virtual base list and already constructed. 1902 if (Base->isVirtual()) 1903 continue; 1904 1905 if (CXXBaseOrMemberInitializer *Value 1906 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1907 Info.AllToInit.push_back(Value); 1908 } else if (!AnyErrors) { 1909 CXXBaseOrMemberInitializer *CXXBaseInit; 1910 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1911 Base, /*IsInheritedVirtualBase=*/false, 1912 CXXBaseInit)) { 1913 HadError = true; 1914 continue; 1915 } 1916 1917 Info.AllToInit.push_back(CXXBaseInit); 1918 } 1919 } 1920 1921 // Fields. 1922 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1923 E = ClassDecl->field_end(); Field != E; ++Field) { 1924 if ((*Field)->getType()->isIncompleteArrayType()) { 1925 assert(ClassDecl->hasFlexibleArrayMember() && 1926 "Incomplete array type is not valid"); 1927 continue; 1928 } 1929 if (CollectFieldInitializer(Info, *Field, *Field)) 1930 HadError = true; 1931 } 1932 1933 NumInitializers = Info.AllToInit.size(); 1934 if (NumInitializers > 0) { 1935 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1936 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1937 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1938 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1939 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1940 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1941 1942 // Constructors implicitly reference the base and member 1943 // destructors. 1944 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1945 Constructor->getParent()); 1946 } 1947 1948 return HadError; 1949} 1950 1951static void *GetKeyForTopLevelField(FieldDecl *Field) { 1952 // For anonymous unions, use the class declaration as the key. 1953 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1954 if (RT->getDecl()->isAnonymousStructOrUnion()) 1955 return static_cast<void *>(RT->getDecl()); 1956 } 1957 return static_cast<void *>(Field); 1958} 1959 1960static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1961 return Context.getCanonicalType(BaseType).getTypePtr(); 1962} 1963 1964static void *GetKeyForMember(ASTContext &Context, 1965 CXXBaseOrMemberInitializer *Member, 1966 bool MemberMaybeAnon = false) { 1967 if (!Member->isMemberInitializer()) 1968 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1969 1970 // For fields injected into the class via declaration of an anonymous union, 1971 // use its anonymous union class declaration as the unique key. 1972 FieldDecl *Field = Member->getMember(); 1973 1974 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1975 // data member of the class. Data member used in the initializer list is 1976 // in AnonUnionMember field. 1977 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1978 Field = Member->getAnonUnionMember(); 1979 1980 // If the field is a member of an anonymous struct or union, our key 1981 // is the anonymous record decl that's a direct child of the class. 1982 RecordDecl *RD = Field->getParent(); 1983 if (RD->isAnonymousStructOrUnion()) { 1984 while (true) { 1985 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1986 if (Parent->isAnonymousStructOrUnion()) 1987 RD = Parent; 1988 else 1989 break; 1990 } 1991 1992 return static_cast<void *>(RD); 1993 } 1994 1995 return static_cast<void *>(Field); 1996} 1997 1998static void 1999DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2000 const CXXConstructorDecl *Constructor, 2001 CXXBaseOrMemberInitializer **Inits, 2002 unsigned NumInits) { 2003 if (Constructor->getDeclContext()->isDependentContext()) 2004 return; 2005 2006 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2007 == Diagnostic::Ignored) 2008 return; 2009 2010 // Build the list of bases and members in the order that they'll 2011 // actually be initialized. The explicit initializers should be in 2012 // this same order but may be missing things. 2013 llvm::SmallVector<const void*, 32> IdealInitKeys; 2014 2015 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2016 2017 // 1. Virtual bases. 2018 for (CXXRecordDecl::base_class_const_iterator VBase = 2019 ClassDecl->vbases_begin(), 2020 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2021 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2022 2023 // 2. Non-virtual bases. 2024 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2025 E = ClassDecl->bases_end(); Base != E; ++Base) { 2026 if (Base->isVirtual()) 2027 continue; 2028 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2029 } 2030 2031 // 3. Direct fields. 2032 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2033 E = ClassDecl->field_end(); Field != E; ++Field) 2034 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2035 2036 unsigned NumIdealInits = IdealInitKeys.size(); 2037 unsigned IdealIndex = 0; 2038 2039 CXXBaseOrMemberInitializer *PrevInit = 0; 2040 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2041 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2042 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2043 2044 // Scan forward to try to find this initializer in the idealized 2045 // initializers list. 2046 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2047 if (InitKey == IdealInitKeys[IdealIndex]) 2048 break; 2049 2050 // If we didn't find this initializer, it must be because we 2051 // scanned past it on a previous iteration. That can only 2052 // happen if we're out of order; emit a warning. 2053 if (IdealIndex == NumIdealInits && PrevInit) { 2054 Sema::SemaDiagnosticBuilder D = 2055 SemaRef.Diag(PrevInit->getSourceLocation(), 2056 diag::warn_initializer_out_of_order); 2057 2058 if (PrevInit->isMemberInitializer()) 2059 D << 0 << PrevInit->getMember()->getDeclName(); 2060 else 2061 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2062 2063 if (Init->isMemberInitializer()) 2064 D << 0 << Init->getMember()->getDeclName(); 2065 else 2066 D << 1 << Init->getBaseClassInfo()->getType(); 2067 2068 // Move back to the initializer's location in the ideal list. 2069 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2070 if (InitKey == IdealInitKeys[IdealIndex]) 2071 break; 2072 2073 assert(IdealIndex != NumIdealInits && 2074 "initializer not found in initializer list"); 2075 } 2076 2077 PrevInit = Init; 2078 } 2079} 2080 2081namespace { 2082bool CheckRedundantInit(Sema &S, 2083 CXXBaseOrMemberInitializer *Init, 2084 CXXBaseOrMemberInitializer *&PrevInit) { 2085 if (!PrevInit) { 2086 PrevInit = Init; 2087 return false; 2088 } 2089 2090 if (FieldDecl *Field = Init->getMember()) 2091 S.Diag(Init->getSourceLocation(), 2092 diag::err_multiple_mem_initialization) 2093 << Field->getDeclName() 2094 << Init->getSourceRange(); 2095 else { 2096 Type *BaseClass = Init->getBaseClass(); 2097 assert(BaseClass && "neither field nor base"); 2098 S.Diag(Init->getSourceLocation(), 2099 diag::err_multiple_base_initialization) 2100 << QualType(BaseClass, 0) 2101 << Init->getSourceRange(); 2102 } 2103 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2104 << 0 << PrevInit->getSourceRange(); 2105 2106 return true; 2107} 2108 2109typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2110typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2111 2112bool CheckRedundantUnionInit(Sema &S, 2113 CXXBaseOrMemberInitializer *Init, 2114 RedundantUnionMap &Unions) { 2115 FieldDecl *Field = Init->getMember(); 2116 RecordDecl *Parent = Field->getParent(); 2117 if (!Parent->isAnonymousStructOrUnion()) 2118 return false; 2119 2120 NamedDecl *Child = Field; 2121 do { 2122 if (Parent->isUnion()) { 2123 UnionEntry &En = Unions[Parent]; 2124 if (En.first && En.first != Child) { 2125 S.Diag(Init->getSourceLocation(), 2126 diag::err_multiple_mem_union_initialization) 2127 << Field->getDeclName() 2128 << Init->getSourceRange(); 2129 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2130 << 0 << En.second->getSourceRange(); 2131 return true; 2132 } else if (!En.first) { 2133 En.first = Child; 2134 En.second = Init; 2135 } 2136 } 2137 2138 Child = Parent; 2139 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2140 } while (Parent->isAnonymousStructOrUnion()); 2141 2142 return false; 2143} 2144} 2145 2146/// ActOnMemInitializers - Handle the member initializers for a constructor. 2147void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2148 SourceLocation ColonLoc, 2149 MemInitTy **meminits, unsigned NumMemInits, 2150 bool AnyErrors) { 2151 if (!ConstructorDecl) 2152 return; 2153 2154 AdjustDeclIfTemplate(ConstructorDecl); 2155 2156 CXXConstructorDecl *Constructor 2157 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2158 2159 if (!Constructor) { 2160 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2161 return; 2162 } 2163 2164 CXXBaseOrMemberInitializer **MemInits = 2165 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2166 2167 // Mapping for the duplicate initializers check. 2168 // For member initializers, this is keyed with a FieldDecl*. 2169 // For base initializers, this is keyed with a Type*. 2170 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2171 2172 // Mapping for the inconsistent anonymous-union initializers check. 2173 RedundantUnionMap MemberUnions; 2174 2175 bool HadError = false; 2176 for (unsigned i = 0; i < NumMemInits; i++) { 2177 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2178 2179 // Set the source order index. 2180 Init->setSourceOrder(i); 2181 2182 if (Init->isMemberInitializer()) { 2183 FieldDecl *Field = Init->getMember(); 2184 if (CheckRedundantInit(*this, Init, Members[Field]) || 2185 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2186 HadError = true; 2187 } else { 2188 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2189 if (CheckRedundantInit(*this, Init, Members[Key])) 2190 HadError = true; 2191 } 2192 } 2193 2194 if (HadError) 2195 return; 2196 2197 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2198 2199 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2200} 2201 2202void 2203Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2204 CXXRecordDecl *ClassDecl) { 2205 // Ignore dependent contexts. 2206 if (ClassDecl->isDependentContext()) 2207 return; 2208 2209 // FIXME: all the access-control diagnostics are positioned on the 2210 // field/base declaration. That's probably good; that said, the 2211 // user might reasonably want to know why the destructor is being 2212 // emitted, and we currently don't say. 2213 2214 // Non-static data members. 2215 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2216 E = ClassDecl->field_end(); I != E; ++I) { 2217 FieldDecl *Field = *I; 2218 if (Field->isInvalidDecl()) 2219 continue; 2220 QualType FieldType = Context.getBaseElementType(Field->getType()); 2221 2222 const RecordType* RT = FieldType->getAs<RecordType>(); 2223 if (!RT) 2224 continue; 2225 2226 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2227 if (FieldClassDecl->hasTrivialDestructor()) 2228 continue; 2229 2230 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2231 CheckDestructorAccess(Field->getLocation(), Dtor, 2232 PDiag(diag::err_access_dtor_field) 2233 << Field->getDeclName() 2234 << FieldType); 2235 2236 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2237 } 2238 2239 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2240 2241 // Bases. 2242 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2243 E = ClassDecl->bases_end(); Base != E; ++Base) { 2244 // Bases are always records in a well-formed non-dependent class. 2245 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2246 2247 // Remember direct virtual bases. 2248 if (Base->isVirtual()) 2249 DirectVirtualBases.insert(RT); 2250 2251 // Ignore trivial destructors. 2252 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2253 if (BaseClassDecl->hasTrivialDestructor()) 2254 continue; 2255 2256 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2257 2258 // FIXME: caret should be on the start of the class name 2259 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2260 PDiag(diag::err_access_dtor_base) 2261 << Base->getType() 2262 << Base->getSourceRange()); 2263 2264 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2265 } 2266 2267 // Virtual bases. 2268 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2269 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2270 2271 // Bases are always records in a well-formed non-dependent class. 2272 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2273 2274 // Ignore direct virtual bases. 2275 if (DirectVirtualBases.count(RT)) 2276 continue; 2277 2278 // Ignore trivial destructors. 2279 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2280 if (BaseClassDecl->hasTrivialDestructor()) 2281 continue; 2282 2283 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2284 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2285 PDiag(diag::err_access_dtor_vbase) 2286 << VBase->getType()); 2287 2288 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2289 } 2290} 2291 2292void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2293 if (!CDtorDecl) 2294 return; 2295 2296 if (CXXConstructorDecl *Constructor 2297 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2298 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2299} 2300 2301bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2302 unsigned DiagID, AbstractDiagSelID SelID, 2303 const CXXRecordDecl *CurrentRD) { 2304 if (SelID == -1) 2305 return RequireNonAbstractType(Loc, T, 2306 PDiag(DiagID), CurrentRD); 2307 else 2308 return RequireNonAbstractType(Loc, T, 2309 PDiag(DiagID) << SelID, CurrentRD); 2310} 2311 2312bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2313 const PartialDiagnostic &PD, 2314 const CXXRecordDecl *CurrentRD) { 2315 if (!getLangOptions().CPlusPlus) 2316 return false; 2317 2318 if (const ArrayType *AT = Context.getAsArrayType(T)) 2319 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2320 CurrentRD); 2321 2322 if (const PointerType *PT = T->getAs<PointerType>()) { 2323 // Find the innermost pointer type. 2324 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2325 PT = T; 2326 2327 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2328 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2329 } 2330 2331 const RecordType *RT = T->getAs<RecordType>(); 2332 if (!RT) 2333 return false; 2334 2335 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2336 2337 if (CurrentRD && CurrentRD != RD) 2338 return false; 2339 2340 // FIXME: is this reasonable? It matches current behavior, but.... 2341 if (!RD->getDefinition()) 2342 return false; 2343 2344 if (!RD->isAbstract()) 2345 return false; 2346 2347 Diag(Loc, PD) << RD->getDeclName(); 2348 2349 // Check if we've already emitted the list of pure virtual functions for this 2350 // class. 2351 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2352 return true; 2353 2354 CXXFinalOverriderMap FinalOverriders; 2355 RD->getFinalOverriders(FinalOverriders); 2356 2357 // Keep a set of seen pure methods so we won't diagnose the same method 2358 // more than once. 2359 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2360 2361 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2362 MEnd = FinalOverriders.end(); 2363 M != MEnd; 2364 ++M) { 2365 for (OverridingMethods::iterator SO = M->second.begin(), 2366 SOEnd = M->second.end(); 2367 SO != SOEnd; ++SO) { 2368 // C++ [class.abstract]p4: 2369 // A class is abstract if it contains or inherits at least one 2370 // pure virtual function for which the final overrider is pure 2371 // virtual. 2372 2373 // 2374 if (SO->second.size() != 1) 2375 continue; 2376 2377 if (!SO->second.front().Method->isPure()) 2378 continue; 2379 2380 if (!SeenPureMethods.insert(SO->second.front().Method)) 2381 continue; 2382 2383 Diag(SO->second.front().Method->getLocation(), 2384 diag::note_pure_virtual_function) 2385 << SO->second.front().Method->getDeclName(); 2386 } 2387 } 2388 2389 if (!PureVirtualClassDiagSet) 2390 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2391 PureVirtualClassDiagSet->insert(RD); 2392 2393 return true; 2394} 2395 2396namespace { 2397 class AbstractClassUsageDiagnoser 2398 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2399 Sema &SemaRef; 2400 CXXRecordDecl *AbstractClass; 2401 2402 bool VisitDeclContext(const DeclContext *DC) { 2403 bool Invalid = false; 2404 2405 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2406 E = DC->decls_end(); I != E; ++I) 2407 Invalid |= Visit(*I); 2408 2409 return Invalid; 2410 } 2411 2412 public: 2413 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2414 : SemaRef(SemaRef), AbstractClass(ac) { 2415 Visit(SemaRef.Context.getTranslationUnitDecl()); 2416 } 2417 2418 bool VisitFunctionDecl(const FunctionDecl *FD) { 2419 if (FD->isThisDeclarationADefinition()) { 2420 // No need to do the check if we're in a definition, because it requires 2421 // that the return/param types are complete. 2422 // because that requires 2423 return VisitDeclContext(FD); 2424 } 2425 2426 // Check the return type. 2427 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2428 bool Invalid = 2429 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2430 diag::err_abstract_type_in_decl, 2431 Sema::AbstractReturnType, 2432 AbstractClass); 2433 2434 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2435 E = FD->param_end(); I != E; ++I) { 2436 const ParmVarDecl *VD = *I; 2437 Invalid |= 2438 SemaRef.RequireNonAbstractType(VD->getLocation(), 2439 VD->getOriginalType(), 2440 diag::err_abstract_type_in_decl, 2441 Sema::AbstractParamType, 2442 AbstractClass); 2443 } 2444 2445 return Invalid; 2446 } 2447 2448 bool VisitDecl(const Decl* D) { 2449 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2450 return VisitDeclContext(DC); 2451 2452 return false; 2453 } 2454 }; 2455} 2456 2457/// \brief Perform semantic checks on a class definition that has been 2458/// completing, introducing implicitly-declared members, checking for 2459/// abstract types, etc. 2460void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2461 if (!Record || Record->isInvalidDecl()) 2462 return; 2463 2464 if (!Record->isDependentType()) 2465 AddImplicitlyDeclaredMembersToClass(S, Record); 2466 2467 if (Record->isInvalidDecl()) 2468 return; 2469 2470 // Set access bits correctly on the directly-declared conversions. 2471 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2472 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2473 Convs->setAccess(I, (*I)->getAccess()); 2474 2475 // Determine whether we need to check for final overriders. We do 2476 // this either when there are virtual base classes (in which case we 2477 // may end up finding multiple final overriders for a given virtual 2478 // function) or any of the base classes is abstract (in which case 2479 // we might detect that this class is abstract). 2480 bool CheckFinalOverriders = false; 2481 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2482 !Record->isDependentType()) { 2483 if (Record->getNumVBases()) 2484 CheckFinalOverriders = true; 2485 else if (!Record->isAbstract()) { 2486 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2487 BEnd = Record->bases_end(); 2488 B != BEnd; ++B) { 2489 CXXRecordDecl *BaseDecl 2490 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2491 if (BaseDecl->isAbstract()) { 2492 CheckFinalOverriders = true; 2493 break; 2494 } 2495 } 2496 } 2497 } 2498 2499 if (CheckFinalOverriders) { 2500 CXXFinalOverriderMap FinalOverriders; 2501 Record->getFinalOverriders(FinalOverriders); 2502 2503 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2504 MEnd = FinalOverriders.end(); 2505 M != MEnd; ++M) { 2506 for (OverridingMethods::iterator SO = M->second.begin(), 2507 SOEnd = M->second.end(); 2508 SO != SOEnd; ++SO) { 2509 assert(SO->second.size() > 0 && 2510 "All virtual functions have overridding virtual functions"); 2511 if (SO->second.size() == 1) { 2512 // C++ [class.abstract]p4: 2513 // A class is abstract if it contains or inherits at least one 2514 // pure virtual function for which the final overrider is pure 2515 // virtual. 2516 if (SO->second.front().Method->isPure()) 2517 Record->setAbstract(true); 2518 continue; 2519 } 2520 2521 // C++ [class.virtual]p2: 2522 // In a derived class, if a virtual member function of a base 2523 // class subobject has more than one final overrider the 2524 // program is ill-formed. 2525 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2526 << (NamedDecl *)M->first << Record; 2527 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2528 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2529 OMEnd = SO->second.end(); 2530 OM != OMEnd; ++OM) 2531 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2532 << (NamedDecl *)M->first << OM->Method->getParent(); 2533 2534 Record->setInvalidDecl(); 2535 } 2536 } 2537 } 2538 2539 if (Record->isAbstract() && !Record->isInvalidDecl()) 2540 (void)AbstractClassUsageDiagnoser(*this, Record); 2541 2542 // If this is not an aggregate type and has no user-declared constructor, 2543 // complain about any non-static data members of reference or const scalar 2544 // type, since they will never get initializers. 2545 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2546 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2547 bool Complained = false; 2548 for (RecordDecl::field_iterator F = Record->field_begin(), 2549 FEnd = Record->field_end(); 2550 F != FEnd; ++F) { 2551 if (F->getType()->isReferenceType() || 2552 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2553 if (!Complained) { 2554 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2555 << Record->getTagKind() << Record; 2556 Complained = true; 2557 } 2558 2559 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2560 << F->getType()->isReferenceType() 2561 << F->getDeclName(); 2562 } 2563 } 2564 } 2565 2566 if (Record->isDynamicClass()) 2567 DynamicClasses.push_back(Record); 2568} 2569 2570void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2571 DeclPtrTy TagDecl, 2572 SourceLocation LBrac, 2573 SourceLocation RBrac, 2574 AttributeList *AttrList) { 2575 if (!TagDecl) 2576 return; 2577 2578 AdjustDeclIfTemplate(TagDecl); 2579 2580 ActOnFields(S, RLoc, TagDecl, 2581 (DeclPtrTy*)FieldCollector->getCurFields(), 2582 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2583 2584 CheckCompletedCXXClass(S, 2585 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2586} 2587 2588/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2589/// special functions, such as the default constructor, copy 2590/// constructor, or destructor, to the given C++ class (C++ 2591/// [special]p1). This routine can only be executed just before the 2592/// definition of the class is complete. 2593/// 2594/// The scope, if provided, is the class scope. 2595void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2596 CXXRecordDecl *ClassDecl) { 2597 CanQualType ClassType 2598 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2599 2600 // FIXME: Implicit declarations have exception specifications, which are 2601 // the union of the specifications of the implicitly called functions. 2602 2603 if (!ClassDecl->hasUserDeclaredConstructor()) { 2604 // C++ [class.ctor]p5: 2605 // A default constructor for a class X is a constructor of class X 2606 // that can be called without an argument. If there is no 2607 // user-declared constructor for class X, a default constructor is 2608 // implicitly declared. An implicitly-declared default constructor 2609 // is an inline public member of its class. 2610 DeclarationName Name 2611 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2612 CXXConstructorDecl *DefaultCon = 2613 CXXConstructorDecl::Create(Context, ClassDecl, 2614 ClassDecl->getLocation(), Name, 2615 Context.getFunctionType(Context.VoidTy, 2616 0, 0, false, 0, 2617 /*FIXME*/false, false, 2618 0, 0, 2619 FunctionType::ExtInfo()), 2620 /*TInfo=*/0, 2621 /*isExplicit=*/false, 2622 /*isInline=*/true, 2623 /*isImplicitlyDeclared=*/true); 2624 DefaultCon->setAccess(AS_public); 2625 DefaultCon->setImplicit(); 2626 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2627 if (S) 2628 PushOnScopeChains(DefaultCon, S, true); 2629 else 2630 ClassDecl->addDecl(DefaultCon); 2631 } 2632 2633 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2634 // C++ [class.copy]p4: 2635 // If the class definition does not explicitly declare a copy 2636 // constructor, one is declared implicitly. 2637 2638 // C++ [class.copy]p5: 2639 // The implicitly-declared copy constructor for a class X will 2640 // have the form 2641 // 2642 // X::X(const X&) 2643 // 2644 // if 2645 bool HasConstCopyConstructor = true; 2646 2647 // -- each direct or virtual base class B of X has a copy 2648 // constructor whose first parameter is of type const B& or 2649 // const volatile B&, and 2650 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2651 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2652 const CXXRecordDecl *BaseClassDecl 2653 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2654 HasConstCopyConstructor 2655 = BaseClassDecl->hasConstCopyConstructor(Context); 2656 } 2657 2658 // -- for all the nonstatic data members of X that are of a 2659 // class type M (or array thereof), each such class type 2660 // has a copy constructor whose first parameter is of type 2661 // const M& or const volatile M&. 2662 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2663 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2664 ++Field) { 2665 QualType FieldType = (*Field)->getType(); 2666 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2667 FieldType = Array->getElementType(); 2668 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2669 const CXXRecordDecl *FieldClassDecl 2670 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2671 HasConstCopyConstructor 2672 = FieldClassDecl->hasConstCopyConstructor(Context); 2673 } 2674 } 2675 2676 // Otherwise, the implicitly declared copy constructor will have 2677 // the form 2678 // 2679 // X::X(X&) 2680 QualType ArgType = ClassType; 2681 if (HasConstCopyConstructor) 2682 ArgType = ArgType.withConst(); 2683 ArgType = Context.getLValueReferenceType(ArgType); 2684 2685 // An implicitly-declared copy constructor is an inline public 2686 // member of its class. 2687 DeclarationName Name 2688 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2689 CXXConstructorDecl *CopyConstructor 2690 = CXXConstructorDecl::Create(Context, ClassDecl, 2691 ClassDecl->getLocation(), Name, 2692 Context.getFunctionType(Context.VoidTy, 2693 &ArgType, 1, 2694 false, 0, 2695 /*FIXME: hasExceptionSpec*/false, 2696 false, 0, 0, 2697 FunctionType::ExtInfo()), 2698 /*TInfo=*/0, 2699 /*isExplicit=*/false, 2700 /*isInline=*/true, 2701 /*isImplicitlyDeclared=*/true); 2702 CopyConstructor->setAccess(AS_public); 2703 CopyConstructor->setImplicit(); 2704 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2705 2706 // Add the parameter to the constructor. 2707 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2708 ClassDecl->getLocation(), 2709 /*IdentifierInfo=*/0, 2710 ArgType, /*TInfo=*/0, 2711 VarDecl::None, 2712 VarDecl::None, 0); 2713 CopyConstructor->setParams(&FromParam, 1); 2714 if (S) 2715 PushOnScopeChains(CopyConstructor, S, true); 2716 else 2717 ClassDecl->addDecl(CopyConstructor); 2718 } 2719 2720 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2721 // Note: The following rules are largely analoguous to the copy 2722 // constructor rules. Note that virtual bases are not taken into account 2723 // for determining the argument type of the operator. Note also that 2724 // operators taking an object instead of a reference are allowed. 2725 // 2726 // C++ [class.copy]p10: 2727 // If the class definition does not explicitly declare a copy 2728 // assignment operator, one is declared implicitly. 2729 // The implicitly-defined copy assignment operator for a class X 2730 // will have the form 2731 // 2732 // X& X::operator=(const X&) 2733 // 2734 // if 2735 bool HasConstCopyAssignment = true; 2736 2737 // -- each direct base class B of X has a copy assignment operator 2738 // whose parameter is of type const B&, const volatile B& or B, 2739 // and 2740 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2741 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2742 assert(!Base->getType()->isDependentType() && 2743 "Cannot generate implicit members for class with dependent bases."); 2744 const CXXRecordDecl *BaseClassDecl 2745 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2746 const CXXMethodDecl *MD = 0; 2747 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2748 MD); 2749 } 2750 2751 // -- for all the nonstatic data members of X that are of a class 2752 // type M (or array thereof), each such class type has a copy 2753 // assignment operator whose parameter is of type const M&, 2754 // const volatile M& or M. 2755 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2756 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2757 ++Field) { 2758 QualType FieldType = (*Field)->getType(); 2759 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2760 FieldType = Array->getElementType(); 2761 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2762 const CXXRecordDecl *FieldClassDecl 2763 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2764 const CXXMethodDecl *MD = 0; 2765 HasConstCopyAssignment 2766 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2767 } 2768 } 2769 2770 // Otherwise, the implicitly declared copy assignment operator will 2771 // have the form 2772 // 2773 // X& X::operator=(X&) 2774 QualType ArgType = ClassType; 2775 QualType RetType = Context.getLValueReferenceType(ArgType); 2776 if (HasConstCopyAssignment) 2777 ArgType = ArgType.withConst(); 2778 ArgType = Context.getLValueReferenceType(ArgType); 2779 2780 // An implicitly-declared copy assignment operator is an inline public 2781 // member of its class. 2782 DeclarationName Name = 2783 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2784 CXXMethodDecl *CopyAssignment = 2785 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2786 Context.getFunctionType(RetType, &ArgType, 1, 2787 false, 0, 2788 /*FIXME: hasExceptionSpec*/false, 2789 false, 0, 0, 2790 FunctionType::ExtInfo()), 2791 /*TInfo=*/0, /*isStatic=*/false, 2792 /*StorageClassAsWritten=*/FunctionDecl::None, 2793 /*isInline=*/true); 2794 CopyAssignment->setAccess(AS_public); 2795 CopyAssignment->setImplicit(); 2796 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2797 CopyAssignment->setCopyAssignment(true); 2798 2799 // Add the parameter to the operator. 2800 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2801 ClassDecl->getLocation(), 2802 /*Id=*/0, 2803 ArgType, /*TInfo=*/0, 2804 VarDecl::None, 2805 VarDecl::None, 0); 2806 CopyAssignment->setParams(&FromParam, 1); 2807 2808 // Don't call addedAssignmentOperator. There is no way to distinguish an 2809 // implicit from an explicit assignment operator. 2810 if (S) 2811 PushOnScopeChains(CopyAssignment, S, true); 2812 else 2813 ClassDecl->addDecl(CopyAssignment); 2814 AddOverriddenMethods(ClassDecl, CopyAssignment); 2815 } 2816 2817 if (!ClassDecl->hasUserDeclaredDestructor()) { 2818 // C++ [class.dtor]p2: 2819 // If a class has no user-declared destructor, a destructor is 2820 // declared implicitly. An implicitly-declared destructor is an 2821 // inline public member of its class. 2822 QualType Ty = Context.getFunctionType(Context.VoidTy, 2823 0, 0, false, 0, 2824 /*FIXME: hasExceptionSpec*/false, 2825 false, 0, 0, FunctionType::ExtInfo()); 2826 2827 DeclarationName Name 2828 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2829 CXXDestructorDecl *Destructor 2830 = CXXDestructorDecl::Create(Context, ClassDecl, 2831 ClassDecl->getLocation(), Name, Ty, 2832 /*isInline=*/true, 2833 /*isImplicitlyDeclared=*/true); 2834 Destructor->setAccess(AS_public); 2835 Destructor->setImplicit(); 2836 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2837 if (S) 2838 PushOnScopeChains(Destructor, S, true); 2839 else 2840 ClassDecl->addDecl(Destructor); 2841 2842 // This could be uniqued if it ever proves significant. 2843 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2844 2845 AddOverriddenMethods(ClassDecl, Destructor); 2846 } 2847} 2848 2849void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2850 Decl *D = TemplateD.getAs<Decl>(); 2851 if (!D) 2852 return; 2853 2854 TemplateParameterList *Params = 0; 2855 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2856 Params = Template->getTemplateParameters(); 2857 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2858 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2859 Params = PartialSpec->getTemplateParameters(); 2860 else 2861 return; 2862 2863 for (TemplateParameterList::iterator Param = Params->begin(), 2864 ParamEnd = Params->end(); 2865 Param != ParamEnd; ++Param) { 2866 NamedDecl *Named = cast<NamedDecl>(*Param); 2867 if (Named->getDeclName()) { 2868 S->AddDecl(DeclPtrTy::make(Named)); 2869 IdResolver.AddDecl(Named); 2870 } 2871 } 2872} 2873 2874void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2875 if (!RecordD) return; 2876 AdjustDeclIfTemplate(RecordD); 2877 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2878 PushDeclContext(S, Record); 2879} 2880 2881void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2882 if (!RecordD) return; 2883 PopDeclContext(); 2884} 2885 2886/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2887/// parsing a top-level (non-nested) C++ class, and we are now 2888/// parsing those parts of the given Method declaration that could 2889/// not be parsed earlier (C++ [class.mem]p2), such as default 2890/// arguments. This action should enter the scope of the given 2891/// Method declaration as if we had just parsed the qualified method 2892/// name. However, it should not bring the parameters into scope; 2893/// that will be performed by ActOnDelayedCXXMethodParameter. 2894void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2895} 2896 2897/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2898/// C++ method declaration. We're (re-)introducing the given 2899/// function parameter into scope for use in parsing later parts of 2900/// the method declaration. For example, we could see an 2901/// ActOnParamDefaultArgument event for this parameter. 2902void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2903 if (!ParamD) 2904 return; 2905 2906 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2907 2908 // If this parameter has an unparsed default argument, clear it out 2909 // to make way for the parsed default argument. 2910 if (Param->hasUnparsedDefaultArg()) 2911 Param->setDefaultArg(0); 2912 2913 S->AddDecl(DeclPtrTy::make(Param)); 2914 if (Param->getDeclName()) 2915 IdResolver.AddDecl(Param); 2916} 2917 2918/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2919/// processing the delayed method declaration for Method. The method 2920/// declaration is now considered finished. There may be a separate 2921/// ActOnStartOfFunctionDef action later (not necessarily 2922/// immediately!) for this method, if it was also defined inside the 2923/// class body. 2924void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2925 if (!MethodD) 2926 return; 2927 2928 AdjustDeclIfTemplate(MethodD); 2929 2930 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2931 2932 // Now that we have our default arguments, check the constructor 2933 // again. It could produce additional diagnostics or affect whether 2934 // the class has implicitly-declared destructors, among other 2935 // things. 2936 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2937 CheckConstructor(Constructor); 2938 2939 // Check the default arguments, which we may have added. 2940 if (!Method->isInvalidDecl()) 2941 CheckCXXDefaultArguments(Method); 2942} 2943 2944/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2945/// the well-formedness of the constructor declarator @p D with type @p 2946/// R. If there are any errors in the declarator, this routine will 2947/// emit diagnostics and set the invalid bit to true. In any case, the type 2948/// will be updated to reflect a well-formed type for the constructor and 2949/// returned. 2950QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2951 FunctionDecl::StorageClass &SC) { 2952 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2953 2954 // C++ [class.ctor]p3: 2955 // A constructor shall not be virtual (10.3) or static (9.4). A 2956 // constructor can be invoked for a const, volatile or const 2957 // volatile object. A constructor shall not be declared const, 2958 // volatile, or const volatile (9.3.2). 2959 if (isVirtual) { 2960 if (!D.isInvalidType()) 2961 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2962 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2963 << SourceRange(D.getIdentifierLoc()); 2964 D.setInvalidType(); 2965 } 2966 if (SC == FunctionDecl::Static) { 2967 if (!D.isInvalidType()) 2968 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2969 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2970 << SourceRange(D.getIdentifierLoc()); 2971 D.setInvalidType(); 2972 SC = FunctionDecl::None; 2973 } 2974 2975 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2976 if (FTI.TypeQuals != 0) { 2977 if (FTI.TypeQuals & Qualifiers::Const) 2978 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2979 << "const" << SourceRange(D.getIdentifierLoc()); 2980 if (FTI.TypeQuals & Qualifiers::Volatile) 2981 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2982 << "volatile" << SourceRange(D.getIdentifierLoc()); 2983 if (FTI.TypeQuals & Qualifiers::Restrict) 2984 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2985 << "restrict" << SourceRange(D.getIdentifierLoc()); 2986 } 2987 2988 // Rebuild the function type "R" without any type qualifiers (in 2989 // case any of the errors above fired) and with "void" as the 2990 // return type, since constructors don't have return types. We 2991 // *always* have to do this, because GetTypeForDeclarator will 2992 // put in a result type of "int" when none was specified. 2993 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2994 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2995 Proto->getNumArgs(), 2996 Proto->isVariadic(), 0, 2997 Proto->hasExceptionSpec(), 2998 Proto->hasAnyExceptionSpec(), 2999 Proto->getNumExceptions(), 3000 Proto->exception_begin(), 3001 Proto->getExtInfo()); 3002} 3003 3004/// CheckConstructor - Checks a fully-formed constructor for 3005/// well-formedness, issuing any diagnostics required. Returns true if 3006/// the constructor declarator is invalid. 3007void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3008 CXXRecordDecl *ClassDecl 3009 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3010 if (!ClassDecl) 3011 return Constructor->setInvalidDecl(); 3012 3013 // C++ [class.copy]p3: 3014 // A declaration of a constructor for a class X is ill-formed if 3015 // its first parameter is of type (optionally cv-qualified) X and 3016 // either there are no other parameters or else all other 3017 // parameters have default arguments. 3018 if (!Constructor->isInvalidDecl() && 3019 ((Constructor->getNumParams() == 1) || 3020 (Constructor->getNumParams() > 1 && 3021 Constructor->getParamDecl(1)->hasDefaultArg())) && 3022 Constructor->getTemplateSpecializationKind() 3023 != TSK_ImplicitInstantiation) { 3024 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3025 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3026 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3027 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3028 const char *ConstRef 3029 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3030 : " const &"; 3031 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3032 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3033 3034 // FIXME: Rather that making the constructor invalid, we should endeavor 3035 // to fix the type. 3036 Constructor->setInvalidDecl(); 3037 } 3038 } 3039 3040 // Notify the class that we've added a constructor. In principle we 3041 // don't need to do this for out-of-line declarations; in practice 3042 // we only instantiate the most recent declaration of a method, so 3043 // we have to call this for everything but friends. 3044 if (!Constructor->getFriendObjectKind()) 3045 ClassDecl->addedConstructor(Context, Constructor); 3046} 3047 3048/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 3049/// issuing any diagnostics required. Returns true on error. 3050bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3051 CXXRecordDecl *RD = Destructor->getParent(); 3052 3053 if (Destructor->isVirtual()) { 3054 SourceLocation Loc; 3055 3056 if (!Destructor->isImplicit()) 3057 Loc = Destructor->getLocation(); 3058 else 3059 Loc = RD->getLocation(); 3060 3061 // If we have a virtual destructor, look up the deallocation function 3062 FunctionDecl *OperatorDelete = 0; 3063 DeclarationName Name = 3064 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3065 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3066 return true; 3067 3068 Destructor->setOperatorDelete(OperatorDelete); 3069 } 3070 3071 return false; 3072} 3073 3074static inline bool 3075FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3076 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3077 FTI.ArgInfo[0].Param && 3078 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 3079} 3080 3081/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3082/// the well-formednes of the destructor declarator @p D with type @p 3083/// R. If there are any errors in the declarator, this routine will 3084/// emit diagnostics and set the declarator to invalid. Even if this happens, 3085/// will be updated to reflect a well-formed type for the destructor and 3086/// returned. 3087QualType Sema::CheckDestructorDeclarator(Declarator &D, 3088 FunctionDecl::StorageClass& SC) { 3089 // C++ [class.dtor]p1: 3090 // [...] A typedef-name that names a class is a class-name 3091 // (7.1.3); however, a typedef-name that names a class shall not 3092 // be used as the identifier in the declarator for a destructor 3093 // declaration. 3094 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3095 if (isa<TypedefType>(DeclaratorType)) { 3096 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3097 << DeclaratorType; 3098 D.setInvalidType(); 3099 } 3100 3101 // C++ [class.dtor]p2: 3102 // A destructor is used to destroy objects of its class type. A 3103 // destructor takes no parameters, and no return type can be 3104 // specified for it (not even void). The address of a destructor 3105 // shall not be taken. A destructor shall not be static. A 3106 // destructor can be invoked for a const, volatile or const 3107 // volatile object. A destructor shall not be declared const, 3108 // volatile or const volatile (9.3.2). 3109 if (SC == FunctionDecl::Static) { 3110 if (!D.isInvalidType()) 3111 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3112 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3113 << SourceRange(D.getIdentifierLoc()); 3114 SC = FunctionDecl::None; 3115 D.setInvalidType(); 3116 } 3117 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3118 // Destructors don't have return types, but the parser will 3119 // happily parse something like: 3120 // 3121 // class X { 3122 // float ~X(); 3123 // }; 3124 // 3125 // The return type will be eliminated later. 3126 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3127 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3128 << SourceRange(D.getIdentifierLoc()); 3129 } 3130 3131 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3132 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3133 if (FTI.TypeQuals & Qualifiers::Const) 3134 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3135 << "const" << SourceRange(D.getIdentifierLoc()); 3136 if (FTI.TypeQuals & Qualifiers::Volatile) 3137 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3138 << "volatile" << SourceRange(D.getIdentifierLoc()); 3139 if (FTI.TypeQuals & Qualifiers::Restrict) 3140 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3141 << "restrict" << SourceRange(D.getIdentifierLoc()); 3142 D.setInvalidType(); 3143 } 3144 3145 // Make sure we don't have any parameters. 3146 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3147 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3148 3149 // Delete the parameters. 3150 FTI.freeArgs(); 3151 D.setInvalidType(); 3152 } 3153 3154 // Make sure the destructor isn't variadic. 3155 if (FTI.isVariadic) { 3156 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3157 D.setInvalidType(); 3158 } 3159 3160 // Rebuild the function type "R" without any type qualifiers or 3161 // parameters (in case any of the errors above fired) and with 3162 // "void" as the return type, since destructors don't have return 3163 // types. We *always* have to do this, because GetTypeForDeclarator 3164 // will put in a result type of "int" when none was specified. 3165 // FIXME: Exceptions! 3166 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3167 false, false, 0, 0, FunctionType::ExtInfo()); 3168} 3169 3170/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3171/// well-formednes of the conversion function declarator @p D with 3172/// type @p R. If there are any errors in the declarator, this routine 3173/// will emit diagnostics and return true. Otherwise, it will return 3174/// false. Either way, the type @p R will be updated to reflect a 3175/// well-formed type for the conversion operator. 3176void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3177 FunctionDecl::StorageClass& SC) { 3178 // C++ [class.conv.fct]p1: 3179 // Neither parameter types nor return type can be specified. The 3180 // type of a conversion function (8.3.5) is "function taking no 3181 // parameter returning conversion-type-id." 3182 if (SC == FunctionDecl::Static) { 3183 if (!D.isInvalidType()) 3184 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3185 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3186 << SourceRange(D.getIdentifierLoc()); 3187 D.setInvalidType(); 3188 SC = FunctionDecl::None; 3189 } 3190 3191 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3192 3193 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3194 // Conversion functions don't have return types, but the parser will 3195 // happily parse something like: 3196 // 3197 // class X { 3198 // float operator bool(); 3199 // }; 3200 // 3201 // The return type will be changed later anyway. 3202 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3203 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3204 << SourceRange(D.getIdentifierLoc()); 3205 D.setInvalidType(); 3206 } 3207 3208 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3209 3210 // Make sure we don't have any parameters. 3211 if (Proto->getNumArgs() > 0) { 3212 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3213 3214 // Delete the parameters. 3215 D.getTypeObject(0).Fun.freeArgs(); 3216 D.setInvalidType(); 3217 } else if (Proto->isVariadic()) { 3218 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3219 D.setInvalidType(); 3220 } 3221 3222 // Diagnose "&operator bool()" and other such nonsense. This 3223 // is actually a gcc extension which we don't support. 3224 if (Proto->getResultType() != ConvType) { 3225 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3226 << Proto->getResultType(); 3227 D.setInvalidType(); 3228 ConvType = Proto->getResultType(); 3229 } 3230 3231 // C++ [class.conv.fct]p4: 3232 // The conversion-type-id shall not represent a function type nor 3233 // an array type. 3234 if (ConvType->isArrayType()) { 3235 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3236 ConvType = Context.getPointerType(ConvType); 3237 D.setInvalidType(); 3238 } else if (ConvType->isFunctionType()) { 3239 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3240 ConvType = Context.getPointerType(ConvType); 3241 D.setInvalidType(); 3242 } 3243 3244 // Rebuild the function type "R" without any parameters (in case any 3245 // of the errors above fired) and with the conversion type as the 3246 // return type. 3247 if (D.isInvalidType()) { 3248 R = Context.getFunctionType(ConvType, 0, 0, false, 3249 Proto->getTypeQuals(), 3250 Proto->hasExceptionSpec(), 3251 Proto->hasAnyExceptionSpec(), 3252 Proto->getNumExceptions(), 3253 Proto->exception_begin(), 3254 Proto->getExtInfo()); 3255 } 3256 3257 // C++0x explicit conversion operators. 3258 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3259 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3260 diag::warn_explicit_conversion_functions) 3261 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3262} 3263 3264/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3265/// the declaration of the given C++ conversion function. This routine 3266/// is responsible for recording the conversion function in the C++ 3267/// class, if possible. 3268Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3269 assert(Conversion && "Expected to receive a conversion function declaration"); 3270 3271 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3272 3273 // Make sure we aren't redeclaring the conversion function. 3274 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3275 3276 // C++ [class.conv.fct]p1: 3277 // [...] A conversion function is never used to convert a 3278 // (possibly cv-qualified) object to the (possibly cv-qualified) 3279 // same object type (or a reference to it), to a (possibly 3280 // cv-qualified) base class of that type (or a reference to it), 3281 // or to (possibly cv-qualified) void. 3282 // FIXME: Suppress this warning if the conversion function ends up being a 3283 // virtual function that overrides a virtual function in a base class. 3284 QualType ClassType 3285 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3286 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3287 ConvType = ConvTypeRef->getPointeeType(); 3288 if (ConvType->isRecordType()) { 3289 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3290 if (ConvType == ClassType) 3291 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3292 << ClassType; 3293 else if (IsDerivedFrom(ClassType, ConvType)) 3294 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3295 << ClassType << ConvType; 3296 } else if (ConvType->isVoidType()) { 3297 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3298 << ClassType << ConvType; 3299 } 3300 3301 if (Conversion->getPrimaryTemplate()) { 3302 // ignore specializations 3303 } else if (Conversion->getPreviousDeclaration()) { 3304 if (FunctionTemplateDecl *ConversionTemplate 3305 = Conversion->getDescribedFunctionTemplate()) { 3306 if (ClassDecl->replaceConversion( 3307 ConversionTemplate->getPreviousDeclaration(), 3308 ConversionTemplate)) 3309 return DeclPtrTy::make(ConversionTemplate); 3310 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3311 Conversion)) 3312 return DeclPtrTy::make(Conversion); 3313 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3314 } else if (FunctionTemplateDecl *ConversionTemplate 3315 = Conversion->getDescribedFunctionTemplate()) 3316 ClassDecl->addConversionFunction(ConversionTemplate); 3317 else 3318 ClassDecl->addConversionFunction(Conversion); 3319 3320 return DeclPtrTy::make(Conversion); 3321} 3322 3323//===----------------------------------------------------------------------===// 3324// Namespace Handling 3325//===----------------------------------------------------------------------===// 3326 3327/// ActOnStartNamespaceDef - This is called at the start of a namespace 3328/// definition. 3329Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3330 SourceLocation IdentLoc, 3331 IdentifierInfo *II, 3332 SourceLocation LBrace, 3333 AttributeList *AttrList) { 3334 NamespaceDecl *Namespc = 3335 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3336 Namespc->setLBracLoc(LBrace); 3337 3338 Scope *DeclRegionScope = NamespcScope->getParent(); 3339 3340 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3341 3342 if (II) { 3343 // C++ [namespace.def]p2: 3344 // The identifier in an original-namespace-definition shall not have been 3345 // previously defined in the declarative region in which the 3346 // original-namespace-definition appears. The identifier in an 3347 // original-namespace-definition is the name of the namespace. Subsequently 3348 // in that declarative region, it is treated as an original-namespace-name. 3349 3350 NamedDecl *PrevDecl 3351 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3352 ForRedeclaration); 3353 3354 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3355 // This is an extended namespace definition. 3356 // Attach this namespace decl to the chain of extended namespace 3357 // definitions. 3358 OrigNS->setNextNamespace(Namespc); 3359 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3360 3361 // Remove the previous declaration from the scope. 3362 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3363 IdResolver.RemoveDecl(OrigNS); 3364 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3365 } 3366 } else if (PrevDecl) { 3367 // This is an invalid name redefinition. 3368 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3369 << Namespc->getDeclName(); 3370 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3371 Namespc->setInvalidDecl(); 3372 // Continue on to push Namespc as current DeclContext and return it. 3373 } else if (II->isStr("std") && 3374 CurContext->getLookupContext()->isTranslationUnit()) { 3375 // This is the first "real" definition of the namespace "std", so update 3376 // our cache of the "std" namespace to point at this definition. 3377 if (StdNamespace) { 3378 // We had already defined a dummy namespace "std". Link this new 3379 // namespace definition to the dummy namespace "std". 3380 StdNamespace->setNextNamespace(Namespc); 3381 StdNamespace->setLocation(IdentLoc); 3382 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3383 } 3384 3385 // Make our StdNamespace cache point at the first real definition of the 3386 // "std" namespace. 3387 StdNamespace = Namespc; 3388 } 3389 3390 PushOnScopeChains(Namespc, DeclRegionScope); 3391 } else { 3392 // Anonymous namespaces. 3393 assert(Namespc->isAnonymousNamespace()); 3394 3395 // Link the anonymous namespace into its parent. 3396 NamespaceDecl *PrevDecl; 3397 DeclContext *Parent = CurContext->getLookupContext(); 3398 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3399 PrevDecl = TU->getAnonymousNamespace(); 3400 TU->setAnonymousNamespace(Namespc); 3401 } else { 3402 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3403 PrevDecl = ND->getAnonymousNamespace(); 3404 ND->setAnonymousNamespace(Namespc); 3405 } 3406 3407 // Link the anonymous namespace with its previous declaration. 3408 if (PrevDecl) { 3409 assert(PrevDecl->isAnonymousNamespace()); 3410 assert(!PrevDecl->getNextNamespace()); 3411 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3412 PrevDecl->setNextNamespace(Namespc); 3413 } 3414 3415 CurContext->addDecl(Namespc); 3416 3417 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3418 // behaves as if it were replaced by 3419 // namespace unique { /* empty body */ } 3420 // using namespace unique; 3421 // namespace unique { namespace-body } 3422 // where all occurrences of 'unique' in a translation unit are 3423 // replaced by the same identifier and this identifier differs 3424 // from all other identifiers in the entire program. 3425 3426 // We just create the namespace with an empty name and then add an 3427 // implicit using declaration, just like the standard suggests. 3428 // 3429 // CodeGen enforces the "universally unique" aspect by giving all 3430 // declarations semantically contained within an anonymous 3431 // namespace internal linkage. 3432 3433 if (!PrevDecl) { 3434 UsingDirectiveDecl* UD 3435 = UsingDirectiveDecl::Create(Context, CurContext, 3436 /* 'using' */ LBrace, 3437 /* 'namespace' */ SourceLocation(), 3438 /* qualifier */ SourceRange(), 3439 /* NNS */ NULL, 3440 /* identifier */ SourceLocation(), 3441 Namespc, 3442 /* Ancestor */ CurContext); 3443 UD->setImplicit(); 3444 CurContext->addDecl(UD); 3445 } 3446 } 3447 3448 // Although we could have an invalid decl (i.e. the namespace name is a 3449 // redefinition), push it as current DeclContext and try to continue parsing. 3450 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3451 // for the namespace has the declarations that showed up in that particular 3452 // namespace definition. 3453 PushDeclContext(NamespcScope, Namespc); 3454 return DeclPtrTy::make(Namespc); 3455} 3456 3457/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3458/// is a namespace alias, returns the namespace it points to. 3459static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3460 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3461 return AD->getNamespace(); 3462 return dyn_cast_or_null<NamespaceDecl>(D); 3463} 3464 3465/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3466/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3467void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3468 Decl *Dcl = D.getAs<Decl>(); 3469 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3470 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3471 Namespc->setRBracLoc(RBrace); 3472 PopDeclContext(); 3473} 3474 3475/// \brief Retrieve the special "std" namespace, which may require us to 3476/// implicitly define the namespace. 3477NamespaceDecl *Sema::getStdNamespace() { 3478 if (!StdNamespace) { 3479 // The "std" namespace has not yet been defined, so build one implicitly. 3480 StdNamespace = NamespaceDecl::Create(Context, 3481 Context.getTranslationUnitDecl(), 3482 SourceLocation(), 3483 &PP.getIdentifierTable().get("std")); 3484 StdNamespace->setImplicit(true); 3485 } 3486 3487 return StdNamespace; 3488} 3489 3490Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3491 SourceLocation UsingLoc, 3492 SourceLocation NamespcLoc, 3493 CXXScopeSpec &SS, 3494 SourceLocation IdentLoc, 3495 IdentifierInfo *NamespcName, 3496 AttributeList *AttrList) { 3497 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3498 assert(NamespcName && "Invalid NamespcName."); 3499 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3500 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3501 3502 UsingDirectiveDecl *UDir = 0; 3503 NestedNameSpecifier *Qualifier = 0; 3504 if (SS.isSet()) 3505 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3506 3507 // Lookup namespace name. 3508 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3509 LookupParsedName(R, S, &SS); 3510 if (R.isAmbiguous()) 3511 return DeclPtrTy(); 3512 3513 if (R.empty()) { 3514 // Allow "using namespace std;" or "using namespace ::std;" even if 3515 // "std" hasn't been defined yet, for GCC compatibility. 3516 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3517 NamespcName->isStr("std")) { 3518 Diag(IdentLoc, diag::ext_using_undefined_std); 3519 R.addDecl(getStdNamespace()); 3520 R.resolveKind(); 3521 } 3522 // Otherwise, attempt typo correction. 3523 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3524 CTC_NoKeywords, 0)) { 3525 if (R.getAsSingle<NamespaceDecl>() || 3526 R.getAsSingle<NamespaceAliasDecl>()) { 3527 if (DeclContext *DC = computeDeclContext(SS, false)) 3528 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3529 << NamespcName << DC << Corrected << SS.getRange() 3530 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3531 else 3532 Diag(IdentLoc, diag::err_using_directive_suggest) 3533 << NamespcName << Corrected 3534 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3535 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3536 << Corrected; 3537 3538 NamespcName = Corrected.getAsIdentifierInfo(); 3539 } else { 3540 R.clear(); 3541 R.setLookupName(NamespcName); 3542 } 3543 } 3544 } 3545 3546 if (!R.empty()) { 3547 NamedDecl *Named = R.getFoundDecl(); 3548 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3549 && "expected namespace decl"); 3550 // C++ [namespace.udir]p1: 3551 // A using-directive specifies that the names in the nominated 3552 // namespace can be used in the scope in which the 3553 // using-directive appears after the using-directive. During 3554 // unqualified name lookup (3.4.1), the names appear as if they 3555 // were declared in the nearest enclosing namespace which 3556 // contains both the using-directive and the nominated 3557 // namespace. [Note: in this context, "contains" means "contains 3558 // directly or indirectly". ] 3559 3560 // Find enclosing context containing both using-directive and 3561 // nominated namespace. 3562 NamespaceDecl *NS = getNamespaceDecl(Named); 3563 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3564 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3565 CommonAncestor = CommonAncestor->getParent(); 3566 3567 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3568 SS.getRange(), 3569 (NestedNameSpecifier *)SS.getScopeRep(), 3570 IdentLoc, Named, CommonAncestor); 3571 PushUsingDirective(S, UDir); 3572 } else { 3573 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3574 } 3575 3576 // FIXME: We ignore attributes for now. 3577 delete AttrList; 3578 return DeclPtrTy::make(UDir); 3579} 3580 3581void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3582 // If scope has associated entity, then using directive is at namespace 3583 // or translation unit scope. We add UsingDirectiveDecls, into 3584 // it's lookup structure. 3585 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3586 Ctx->addDecl(UDir); 3587 else 3588 // Otherwise it is block-sope. using-directives will affect lookup 3589 // only to the end of scope. 3590 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3591} 3592 3593 3594Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3595 AccessSpecifier AS, 3596 bool HasUsingKeyword, 3597 SourceLocation UsingLoc, 3598 CXXScopeSpec &SS, 3599 UnqualifiedId &Name, 3600 AttributeList *AttrList, 3601 bool IsTypeName, 3602 SourceLocation TypenameLoc) { 3603 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3604 3605 switch (Name.getKind()) { 3606 case UnqualifiedId::IK_Identifier: 3607 case UnqualifiedId::IK_OperatorFunctionId: 3608 case UnqualifiedId::IK_LiteralOperatorId: 3609 case UnqualifiedId::IK_ConversionFunctionId: 3610 break; 3611 3612 case UnqualifiedId::IK_ConstructorName: 3613 case UnqualifiedId::IK_ConstructorTemplateId: 3614 // C++0x inherited constructors. 3615 if (getLangOptions().CPlusPlus0x) break; 3616 3617 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3618 << SS.getRange(); 3619 return DeclPtrTy(); 3620 3621 case UnqualifiedId::IK_DestructorName: 3622 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3623 << SS.getRange(); 3624 return DeclPtrTy(); 3625 3626 case UnqualifiedId::IK_TemplateId: 3627 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3628 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3629 return DeclPtrTy(); 3630 } 3631 3632 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3633 if (!TargetName) 3634 return DeclPtrTy(); 3635 3636 // Warn about using declarations. 3637 // TODO: store that the declaration was written without 'using' and 3638 // talk about access decls instead of using decls in the 3639 // diagnostics. 3640 if (!HasUsingKeyword) { 3641 UsingLoc = Name.getSourceRange().getBegin(); 3642 3643 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3644 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3645 } 3646 3647 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3648 Name.getSourceRange().getBegin(), 3649 TargetName, AttrList, 3650 /* IsInstantiation */ false, 3651 IsTypeName, TypenameLoc); 3652 if (UD) 3653 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3654 3655 return DeclPtrTy::make(UD); 3656} 3657 3658/// Determines whether to create a using shadow decl for a particular 3659/// decl, given the set of decls existing prior to this using lookup. 3660bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3661 const LookupResult &Previous) { 3662 // Diagnose finding a decl which is not from a base class of the 3663 // current class. We do this now because there are cases where this 3664 // function will silently decide not to build a shadow decl, which 3665 // will pre-empt further diagnostics. 3666 // 3667 // We don't need to do this in C++0x because we do the check once on 3668 // the qualifier. 3669 // 3670 // FIXME: diagnose the following if we care enough: 3671 // struct A { int foo; }; 3672 // struct B : A { using A::foo; }; 3673 // template <class T> struct C : A {}; 3674 // template <class T> struct D : C<T> { using B::foo; } // <--- 3675 // This is invalid (during instantiation) in C++03 because B::foo 3676 // resolves to the using decl in B, which is not a base class of D<T>. 3677 // We can't diagnose it immediately because C<T> is an unknown 3678 // specialization. The UsingShadowDecl in D<T> then points directly 3679 // to A::foo, which will look well-formed when we instantiate. 3680 // The right solution is to not collapse the shadow-decl chain. 3681 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3682 DeclContext *OrigDC = Orig->getDeclContext(); 3683 3684 // Handle enums and anonymous structs. 3685 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3686 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3687 while (OrigRec->isAnonymousStructOrUnion()) 3688 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3689 3690 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3691 if (OrigDC == CurContext) { 3692 Diag(Using->getLocation(), 3693 diag::err_using_decl_nested_name_specifier_is_current_class) 3694 << Using->getNestedNameRange(); 3695 Diag(Orig->getLocation(), diag::note_using_decl_target); 3696 return true; 3697 } 3698 3699 Diag(Using->getNestedNameRange().getBegin(), 3700 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3701 << Using->getTargetNestedNameDecl() 3702 << cast<CXXRecordDecl>(CurContext) 3703 << Using->getNestedNameRange(); 3704 Diag(Orig->getLocation(), diag::note_using_decl_target); 3705 return true; 3706 } 3707 } 3708 3709 if (Previous.empty()) return false; 3710 3711 NamedDecl *Target = Orig; 3712 if (isa<UsingShadowDecl>(Target)) 3713 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3714 3715 // If the target happens to be one of the previous declarations, we 3716 // don't have a conflict. 3717 // 3718 // FIXME: but we might be increasing its access, in which case we 3719 // should redeclare it. 3720 NamedDecl *NonTag = 0, *Tag = 0; 3721 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3722 I != E; ++I) { 3723 NamedDecl *D = (*I)->getUnderlyingDecl(); 3724 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3725 return false; 3726 3727 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3728 } 3729 3730 if (Target->isFunctionOrFunctionTemplate()) { 3731 FunctionDecl *FD; 3732 if (isa<FunctionTemplateDecl>(Target)) 3733 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3734 else 3735 FD = cast<FunctionDecl>(Target); 3736 3737 NamedDecl *OldDecl = 0; 3738 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3739 case Ovl_Overload: 3740 return false; 3741 3742 case Ovl_NonFunction: 3743 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3744 break; 3745 3746 // We found a decl with the exact signature. 3747 case Ovl_Match: 3748 // If we're in a record, we want to hide the target, so we 3749 // return true (without a diagnostic) to tell the caller not to 3750 // build a shadow decl. 3751 if (CurContext->isRecord()) 3752 return true; 3753 3754 // If we're not in a record, this is an error. 3755 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3756 break; 3757 } 3758 3759 Diag(Target->getLocation(), diag::note_using_decl_target); 3760 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3761 return true; 3762 } 3763 3764 // Target is not a function. 3765 3766 if (isa<TagDecl>(Target)) { 3767 // No conflict between a tag and a non-tag. 3768 if (!Tag) return false; 3769 3770 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3771 Diag(Target->getLocation(), diag::note_using_decl_target); 3772 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3773 return true; 3774 } 3775 3776 // No conflict between a tag and a non-tag. 3777 if (!NonTag) return false; 3778 3779 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3780 Diag(Target->getLocation(), diag::note_using_decl_target); 3781 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3782 return true; 3783} 3784 3785/// Builds a shadow declaration corresponding to a 'using' declaration. 3786UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3787 UsingDecl *UD, 3788 NamedDecl *Orig) { 3789 3790 // If we resolved to another shadow declaration, just coalesce them. 3791 NamedDecl *Target = Orig; 3792 if (isa<UsingShadowDecl>(Target)) { 3793 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3794 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3795 } 3796 3797 UsingShadowDecl *Shadow 3798 = UsingShadowDecl::Create(Context, CurContext, 3799 UD->getLocation(), UD, Target); 3800 UD->addShadowDecl(Shadow); 3801 3802 if (S) 3803 PushOnScopeChains(Shadow, S); 3804 else 3805 CurContext->addDecl(Shadow); 3806 Shadow->setAccess(UD->getAccess()); 3807 3808 // Register it as a conversion if appropriate. 3809 if (Shadow->getDeclName().getNameKind() 3810 == DeclarationName::CXXConversionFunctionName) 3811 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3812 3813 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3814 Shadow->setInvalidDecl(); 3815 3816 return Shadow; 3817} 3818 3819/// Hides a using shadow declaration. This is required by the current 3820/// using-decl implementation when a resolvable using declaration in a 3821/// class is followed by a declaration which would hide or override 3822/// one or more of the using decl's targets; for example: 3823/// 3824/// struct Base { void foo(int); }; 3825/// struct Derived : Base { 3826/// using Base::foo; 3827/// void foo(int); 3828/// }; 3829/// 3830/// The governing language is C++03 [namespace.udecl]p12: 3831/// 3832/// When a using-declaration brings names from a base class into a 3833/// derived class scope, member functions in the derived class 3834/// override and/or hide member functions with the same name and 3835/// parameter types in a base class (rather than conflicting). 3836/// 3837/// There are two ways to implement this: 3838/// (1) optimistically create shadow decls when they're not hidden 3839/// by existing declarations, or 3840/// (2) don't create any shadow decls (or at least don't make them 3841/// visible) until we've fully parsed/instantiated the class. 3842/// The problem with (1) is that we might have to retroactively remove 3843/// a shadow decl, which requires several O(n) operations because the 3844/// decl structures are (very reasonably) not designed for removal. 3845/// (2) avoids this but is very fiddly and phase-dependent. 3846void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3847 if (Shadow->getDeclName().getNameKind() == 3848 DeclarationName::CXXConversionFunctionName) 3849 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3850 3851 // Remove it from the DeclContext... 3852 Shadow->getDeclContext()->removeDecl(Shadow); 3853 3854 // ...and the scope, if applicable... 3855 if (S) { 3856 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3857 IdResolver.RemoveDecl(Shadow); 3858 } 3859 3860 // ...and the using decl. 3861 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3862 3863 // TODO: complain somehow if Shadow was used. It shouldn't 3864 // be possible for this to happen, because...? 3865} 3866 3867/// Builds a using declaration. 3868/// 3869/// \param IsInstantiation - Whether this call arises from an 3870/// instantiation of an unresolved using declaration. We treat 3871/// the lookup differently for these declarations. 3872NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3873 SourceLocation UsingLoc, 3874 CXXScopeSpec &SS, 3875 SourceLocation IdentLoc, 3876 DeclarationName Name, 3877 AttributeList *AttrList, 3878 bool IsInstantiation, 3879 bool IsTypeName, 3880 SourceLocation TypenameLoc) { 3881 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3882 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3883 3884 // FIXME: We ignore attributes for now. 3885 delete AttrList; 3886 3887 if (SS.isEmpty()) { 3888 Diag(IdentLoc, diag::err_using_requires_qualname); 3889 return 0; 3890 } 3891 3892 // Do the redeclaration lookup in the current scope. 3893 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3894 ForRedeclaration); 3895 Previous.setHideTags(false); 3896 if (S) { 3897 LookupName(Previous, S); 3898 3899 // It is really dumb that we have to do this. 3900 LookupResult::Filter F = Previous.makeFilter(); 3901 while (F.hasNext()) { 3902 NamedDecl *D = F.next(); 3903 if (!isDeclInScope(D, CurContext, S)) 3904 F.erase(); 3905 } 3906 F.done(); 3907 } else { 3908 assert(IsInstantiation && "no scope in non-instantiation"); 3909 assert(CurContext->isRecord() && "scope not record in instantiation"); 3910 LookupQualifiedName(Previous, CurContext); 3911 } 3912 3913 NestedNameSpecifier *NNS = 3914 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3915 3916 // Check for invalid redeclarations. 3917 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3918 return 0; 3919 3920 // Check for bad qualifiers. 3921 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3922 return 0; 3923 3924 DeclContext *LookupContext = computeDeclContext(SS); 3925 NamedDecl *D; 3926 if (!LookupContext) { 3927 if (IsTypeName) { 3928 // FIXME: not all declaration name kinds are legal here 3929 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3930 UsingLoc, TypenameLoc, 3931 SS.getRange(), NNS, 3932 IdentLoc, Name); 3933 } else { 3934 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3935 UsingLoc, SS.getRange(), NNS, 3936 IdentLoc, Name); 3937 } 3938 } else { 3939 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3940 SS.getRange(), UsingLoc, NNS, Name, 3941 IsTypeName); 3942 } 3943 D->setAccess(AS); 3944 CurContext->addDecl(D); 3945 3946 if (!LookupContext) return D; 3947 UsingDecl *UD = cast<UsingDecl>(D); 3948 3949 if (RequireCompleteDeclContext(SS, LookupContext)) { 3950 UD->setInvalidDecl(); 3951 return UD; 3952 } 3953 3954 // Look up the target name. 3955 3956 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3957 3958 // Unlike most lookups, we don't always want to hide tag 3959 // declarations: tag names are visible through the using declaration 3960 // even if hidden by ordinary names, *except* in a dependent context 3961 // where it's important for the sanity of two-phase lookup. 3962 if (!IsInstantiation) 3963 R.setHideTags(false); 3964 3965 LookupQualifiedName(R, LookupContext); 3966 3967 if (R.empty()) { 3968 Diag(IdentLoc, diag::err_no_member) 3969 << Name << LookupContext << SS.getRange(); 3970 UD->setInvalidDecl(); 3971 return UD; 3972 } 3973 3974 if (R.isAmbiguous()) { 3975 UD->setInvalidDecl(); 3976 return UD; 3977 } 3978 3979 if (IsTypeName) { 3980 // If we asked for a typename and got a non-type decl, error out. 3981 if (!R.getAsSingle<TypeDecl>()) { 3982 Diag(IdentLoc, diag::err_using_typename_non_type); 3983 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3984 Diag((*I)->getUnderlyingDecl()->getLocation(), 3985 diag::note_using_decl_target); 3986 UD->setInvalidDecl(); 3987 return UD; 3988 } 3989 } else { 3990 // If we asked for a non-typename and we got a type, error out, 3991 // but only if this is an instantiation of an unresolved using 3992 // decl. Otherwise just silently find the type name. 3993 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3994 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3995 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3996 UD->setInvalidDecl(); 3997 return UD; 3998 } 3999 } 4000 4001 // C++0x N2914 [namespace.udecl]p6: 4002 // A using-declaration shall not name a namespace. 4003 if (R.getAsSingle<NamespaceDecl>()) { 4004 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4005 << SS.getRange(); 4006 UD->setInvalidDecl(); 4007 return UD; 4008 } 4009 4010 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4011 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4012 BuildUsingShadowDecl(S, UD, *I); 4013 } 4014 4015 return UD; 4016} 4017 4018/// Checks that the given using declaration is not an invalid 4019/// redeclaration. Note that this is checking only for the using decl 4020/// itself, not for any ill-formedness among the UsingShadowDecls. 4021bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4022 bool isTypeName, 4023 const CXXScopeSpec &SS, 4024 SourceLocation NameLoc, 4025 const LookupResult &Prev) { 4026 // C++03 [namespace.udecl]p8: 4027 // C++0x [namespace.udecl]p10: 4028 // A using-declaration is a declaration and can therefore be used 4029 // repeatedly where (and only where) multiple declarations are 4030 // allowed. 4031 // 4032 // That's in non-member contexts. 4033 if (!CurContext->getLookupContext()->isRecord()) 4034 return false; 4035 4036 NestedNameSpecifier *Qual 4037 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4038 4039 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4040 NamedDecl *D = *I; 4041 4042 bool DTypename; 4043 NestedNameSpecifier *DQual; 4044 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4045 DTypename = UD->isTypeName(); 4046 DQual = UD->getTargetNestedNameDecl(); 4047 } else if (UnresolvedUsingValueDecl *UD 4048 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4049 DTypename = false; 4050 DQual = UD->getTargetNestedNameSpecifier(); 4051 } else if (UnresolvedUsingTypenameDecl *UD 4052 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4053 DTypename = true; 4054 DQual = UD->getTargetNestedNameSpecifier(); 4055 } else continue; 4056 4057 // using decls differ if one says 'typename' and the other doesn't. 4058 // FIXME: non-dependent using decls? 4059 if (isTypeName != DTypename) continue; 4060 4061 // using decls differ if they name different scopes (but note that 4062 // template instantiation can cause this check to trigger when it 4063 // didn't before instantiation). 4064 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4065 Context.getCanonicalNestedNameSpecifier(DQual)) 4066 continue; 4067 4068 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4069 Diag(D->getLocation(), diag::note_using_decl) << 1; 4070 return true; 4071 } 4072 4073 return false; 4074} 4075 4076 4077/// Checks that the given nested-name qualifier used in a using decl 4078/// in the current context is appropriately related to the current 4079/// scope. If an error is found, diagnoses it and returns true. 4080bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4081 const CXXScopeSpec &SS, 4082 SourceLocation NameLoc) { 4083 DeclContext *NamedContext = computeDeclContext(SS); 4084 4085 if (!CurContext->isRecord()) { 4086 // C++03 [namespace.udecl]p3: 4087 // C++0x [namespace.udecl]p8: 4088 // A using-declaration for a class member shall be a member-declaration. 4089 4090 // If we weren't able to compute a valid scope, it must be a 4091 // dependent class scope. 4092 if (!NamedContext || NamedContext->isRecord()) { 4093 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4094 << SS.getRange(); 4095 return true; 4096 } 4097 4098 // Otherwise, everything is known to be fine. 4099 return false; 4100 } 4101 4102 // The current scope is a record. 4103 4104 // If the named context is dependent, we can't decide much. 4105 if (!NamedContext) { 4106 // FIXME: in C++0x, we can diagnose if we can prove that the 4107 // nested-name-specifier does not refer to a base class, which is 4108 // still possible in some cases. 4109 4110 // Otherwise we have to conservatively report that things might be 4111 // okay. 4112 return false; 4113 } 4114 4115 if (!NamedContext->isRecord()) { 4116 // Ideally this would point at the last name in the specifier, 4117 // but we don't have that level of source info. 4118 Diag(SS.getRange().getBegin(), 4119 diag::err_using_decl_nested_name_specifier_is_not_class) 4120 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4121 return true; 4122 } 4123 4124 if (getLangOptions().CPlusPlus0x) { 4125 // C++0x [namespace.udecl]p3: 4126 // In a using-declaration used as a member-declaration, the 4127 // nested-name-specifier shall name a base class of the class 4128 // being defined. 4129 4130 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4131 cast<CXXRecordDecl>(NamedContext))) { 4132 if (CurContext == NamedContext) { 4133 Diag(NameLoc, 4134 diag::err_using_decl_nested_name_specifier_is_current_class) 4135 << SS.getRange(); 4136 return true; 4137 } 4138 4139 Diag(SS.getRange().getBegin(), 4140 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4141 << (NestedNameSpecifier*) SS.getScopeRep() 4142 << cast<CXXRecordDecl>(CurContext) 4143 << SS.getRange(); 4144 return true; 4145 } 4146 4147 return false; 4148 } 4149 4150 // C++03 [namespace.udecl]p4: 4151 // A using-declaration used as a member-declaration shall refer 4152 // to a member of a base class of the class being defined [etc.]. 4153 4154 // Salient point: SS doesn't have to name a base class as long as 4155 // lookup only finds members from base classes. Therefore we can 4156 // diagnose here only if we can prove that that can't happen, 4157 // i.e. if the class hierarchies provably don't intersect. 4158 4159 // TODO: it would be nice if "definitely valid" results were cached 4160 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4161 // need to be repeated. 4162 4163 struct UserData { 4164 llvm::DenseSet<const CXXRecordDecl*> Bases; 4165 4166 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4167 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4168 Data->Bases.insert(Base); 4169 return true; 4170 } 4171 4172 bool hasDependentBases(const CXXRecordDecl *Class) { 4173 return !Class->forallBases(collect, this); 4174 } 4175 4176 /// Returns true if the base is dependent or is one of the 4177 /// accumulated base classes. 4178 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4179 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4180 return !Data->Bases.count(Base); 4181 } 4182 4183 bool mightShareBases(const CXXRecordDecl *Class) { 4184 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4185 } 4186 }; 4187 4188 UserData Data; 4189 4190 // Returns false if we find a dependent base. 4191 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4192 return false; 4193 4194 // Returns false if the class has a dependent base or if it or one 4195 // of its bases is present in the base set of the current context. 4196 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4197 return false; 4198 4199 Diag(SS.getRange().getBegin(), 4200 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4201 << (NestedNameSpecifier*) SS.getScopeRep() 4202 << cast<CXXRecordDecl>(CurContext) 4203 << SS.getRange(); 4204 4205 return true; 4206} 4207 4208Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4209 SourceLocation NamespaceLoc, 4210 SourceLocation AliasLoc, 4211 IdentifierInfo *Alias, 4212 CXXScopeSpec &SS, 4213 SourceLocation IdentLoc, 4214 IdentifierInfo *Ident) { 4215 4216 // Lookup the namespace name. 4217 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4218 LookupParsedName(R, S, &SS); 4219 4220 // Check if we have a previous declaration with the same name. 4221 NamedDecl *PrevDecl 4222 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4223 ForRedeclaration); 4224 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4225 PrevDecl = 0; 4226 4227 if (PrevDecl) { 4228 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4229 // We already have an alias with the same name that points to the same 4230 // namespace, so don't create a new one. 4231 // FIXME: At some point, we'll want to create the (redundant) 4232 // declaration to maintain better source information. 4233 if (!R.isAmbiguous() && !R.empty() && 4234 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4235 return DeclPtrTy(); 4236 } 4237 4238 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4239 diag::err_redefinition_different_kind; 4240 Diag(AliasLoc, DiagID) << Alias; 4241 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4242 return DeclPtrTy(); 4243 } 4244 4245 if (R.isAmbiguous()) 4246 return DeclPtrTy(); 4247 4248 if (R.empty()) { 4249 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4250 CTC_NoKeywords, 0)) { 4251 if (R.getAsSingle<NamespaceDecl>() || 4252 R.getAsSingle<NamespaceAliasDecl>()) { 4253 if (DeclContext *DC = computeDeclContext(SS, false)) 4254 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4255 << Ident << DC << Corrected << SS.getRange() 4256 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4257 else 4258 Diag(IdentLoc, diag::err_using_directive_suggest) 4259 << Ident << Corrected 4260 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4261 4262 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4263 << Corrected; 4264 4265 Ident = Corrected.getAsIdentifierInfo(); 4266 } else { 4267 R.clear(); 4268 R.setLookupName(Ident); 4269 } 4270 } 4271 4272 if (R.empty()) { 4273 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4274 return DeclPtrTy(); 4275 } 4276 } 4277 4278 NamespaceAliasDecl *AliasDecl = 4279 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4280 Alias, SS.getRange(), 4281 (NestedNameSpecifier *)SS.getScopeRep(), 4282 IdentLoc, R.getFoundDecl()); 4283 4284 PushOnScopeChains(AliasDecl, S); 4285 return DeclPtrTy::make(AliasDecl); 4286} 4287 4288namespace { 4289 /// \brief Scoped object used to handle the state changes required in Sema 4290 /// to implicitly define the body of a C++ member function; 4291 class ImplicitlyDefinedFunctionScope { 4292 Sema &S; 4293 DeclContext *PreviousContext; 4294 4295 public: 4296 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4297 : S(S), PreviousContext(S.CurContext) 4298 { 4299 S.CurContext = Method; 4300 S.PushFunctionScope(); 4301 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4302 } 4303 4304 ~ImplicitlyDefinedFunctionScope() { 4305 S.PopExpressionEvaluationContext(); 4306 S.PopFunctionOrBlockScope(); 4307 S.CurContext = PreviousContext; 4308 } 4309 }; 4310} 4311 4312void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4313 CXXConstructorDecl *Constructor) { 4314 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4315 !Constructor->isUsed(false)) && 4316 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4317 4318 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4319 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4320 4321 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4322 ErrorTrap Trap(*this); 4323 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4324 Trap.hasErrorOccurred()) { 4325 Diag(CurrentLocation, diag::note_member_synthesized_at) 4326 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4327 Constructor->setInvalidDecl(); 4328 } else { 4329 Constructor->setUsed(); 4330 MarkVTableUsed(CurrentLocation, ClassDecl); 4331 } 4332} 4333 4334void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4335 CXXDestructorDecl *Destructor) { 4336 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4337 "DefineImplicitDestructor - call it for implicit default dtor"); 4338 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4339 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4340 4341 if (Destructor->isInvalidDecl()) 4342 return; 4343 4344 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4345 4346 ErrorTrap Trap(*this); 4347 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4348 Destructor->getParent()); 4349 4350 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4351 Diag(CurrentLocation, diag::note_member_synthesized_at) 4352 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4353 4354 Destructor->setInvalidDecl(); 4355 return; 4356 } 4357 4358 Destructor->setUsed(); 4359 MarkVTableUsed(CurrentLocation, ClassDecl); 4360} 4361 4362/// \brief Builds a statement that copies the given entity from \p From to 4363/// \c To. 4364/// 4365/// This routine is used to copy the members of a class with an 4366/// implicitly-declared copy assignment operator. When the entities being 4367/// copied are arrays, this routine builds for loops to copy them. 4368/// 4369/// \param S The Sema object used for type-checking. 4370/// 4371/// \param Loc The location where the implicit copy is being generated. 4372/// 4373/// \param T The type of the expressions being copied. Both expressions must 4374/// have this type. 4375/// 4376/// \param To The expression we are copying to. 4377/// 4378/// \param From The expression we are copying from. 4379/// 4380/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4381/// Otherwise, it's a non-static member subobject. 4382/// 4383/// \param Depth Internal parameter recording the depth of the recursion. 4384/// 4385/// \returns A statement or a loop that copies the expressions. 4386static Sema::OwningStmtResult 4387BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4388 Sema::OwningExprResult To, Sema::OwningExprResult From, 4389 bool CopyingBaseSubobject, unsigned Depth = 0) { 4390 typedef Sema::OwningStmtResult OwningStmtResult; 4391 typedef Sema::OwningExprResult OwningExprResult; 4392 4393 // C++0x [class.copy]p30: 4394 // Each subobject is assigned in the manner appropriate to its type: 4395 // 4396 // - if the subobject is of class type, the copy assignment operator 4397 // for the class is used (as if by explicit qualification; that is, 4398 // ignoring any possible virtual overriding functions in more derived 4399 // classes); 4400 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4401 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4402 4403 // Look for operator=. 4404 DeclarationName Name 4405 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4406 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4407 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4408 4409 // Filter out any result that isn't a copy-assignment operator. 4410 LookupResult::Filter F = OpLookup.makeFilter(); 4411 while (F.hasNext()) { 4412 NamedDecl *D = F.next(); 4413 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4414 if (Method->isCopyAssignmentOperator()) 4415 continue; 4416 4417 F.erase(); 4418 } 4419 F.done(); 4420 4421 // Suppress the protected check (C++ [class.protected]) for each of the 4422 // assignment operators we found. This strange dance is required when 4423 // we're assigning via a base classes's copy-assignment operator. To 4424 // ensure that we're getting the right base class subobject (without 4425 // ambiguities), we need to cast "this" to that subobject type; to 4426 // ensure that we don't go through the virtual call mechanism, we need 4427 // to qualify the operator= name with the base class (see below). However, 4428 // this means that if the base class has a protected copy assignment 4429 // operator, the protected member access check will fail. So, we 4430 // rewrite "protected" access to "public" access in this case, since we 4431 // know by construction that we're calling from a derived class. 4432 if (CopyingBaseSubobject) { 4433 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4434 L != LEnd; ++L) { 4435 if (L.getAccess() == AS_protected) 4436 L.setAccess(AS_public); 4437 } 4438 } 4439 4440 // Create the nested-name-specifier that will be used to qualify the 4441 // reference to operator=; this is required to suppress the virtual 4442 // call mechanism. 4443 CXXScopeSpec SS; 4444 SS.setRange(Loc); 4445 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4446 T.getTypePtr())); 4447 4448 // Create the reference to operator=. 4449 OwningExprResult OpEqualRef 4450 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4451 /*FirstQualifierInScope=*/0, OpLookup, 4452 /*TemplateArgs=*/0, 4453 /*SuppressQualifierCheck=*/true); 4454 if (OpEqualRef.isInvalid()) 4455 return S.StmtError(); 4456 4457 // Build the call to the assignment operator. 4458 Expr *FromE = From.takeAs<Expr>(); 4459 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4460 OpEqualRef.takeAs<Expr>(), 4461 Loc, &FromE, 1, 0, Loc); 4462 if (Call.isInvalid()) 4463 return S.StmtError(); 4464 4465 return S.Owned(Call.takeAs<Stmt>()); 4466 } 4467 4468 // - if the subobject is of scalar type, the built-in assignment 4469 // operator is used. 4470 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4471 if (!ArrayTy) { 4472 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4473 BinaryOperator::Assign, 4474 To.takeAs<Expr>(), 4475 From.takeAs<Expr>()); 4476 if (Assignment.isInvalid()) 4477 return S.StmtError(); 4478 4479 return S.Owned(Assignment.takeAs<Stmt>()); 4480 } 4481 4482 // - if the subobject is an array, each element is assigned, in the 4483 // manner appropriate to the element type; 4484 4485 // Construct a loop over the array bounds, e.g., 4486 // 4487 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4488 // 4489 // that will copy each of the array elements. 4490 QualType SizeType = S.Context.getSizeType(); 4491 4492 // Create the iteration variable. 4493 IdentifierInfo *IterationVarName = 0; 4494 { 4495 llvm::SmallString<8> Str; 4496 llvm::raw_svector_ostream OS(Str); 4497 OS << "__i" << Depth; 4498 IterationVarName = &S.Context.Idents.get(OS.str()); 4499 } 4500 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4501 IterationVarName, SizeType, 4502 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4503 VarDecl::None, VarDecl::None); 4504 4505 // Initialize the iteration variable to zero. 4506 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4507 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4508 4509 // Create a reference to the iteration variable; we'll use this several 4510 // times throughout. 4511 Expr *IterationVarRef 4512 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4513 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4514 4515 // Create the DeclStmt that holds the iteration variable. 4516 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4517 4518 // Create the comparison against the array bound. 4519 llvm::APInt Upper = ArrayTy->getSize(); 4520 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4521 OwningExprResult Comparison 4522 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4523 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4524 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4525 4526 // Create the pre-increment of the iteration variable. 4527 OwningExprResult Increment 4528 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4529 UnaryOperator::PreInc, 4530 SizeType, Loc)); 4531 4532 // Subscript the "from" and "to" expressions with the iteration variable. 4533 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4534 S.Owned(IterationVarRef->Retain()), 4535 Loc); 4536 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4537 S.Owned(IterationVarRef->Retain()), 4538 Loc); 4539 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4540 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4541 4542 // Build the copy for an individual element of the array. 4543 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4544 ArrayTy->getElementType(), 4545 move(To), move(From), 4546 CopyingBaseSubobject, Depth+1); 4547 if (Copy.isInvalid()) { 4548 InitStmt->Destroy(S.Context); 4549 return S.StmtError(); 4550 } 4551 4552 // Construct the loop that copies all elements of this array. 4553 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4554 S.MakeFullExpr(Comparison), 4555 Sema::DeclPtrTy(), 4556 S.MakeFullExpr(Increment), 4557 Loc, move(Copy)); 4558} 4559 4560void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4561 CXXMethodDecl *CopyAssignOperator) { 4562 assert((CopyAssignOperator->isImplicit() && 4563 CopyAssignOperator->isOverloadedOperator() && 4564 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4565 !CopyAssignOperator->isUsed(false)) && 4566 "DefineImplicitCopyAssignment called for wrong function"); 4567 4568 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4569 4570 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4571 CopyAssignOperator->setInvalidDecl(); 4572 return; 4573 } 4574 4575 CopyAssignOperator->setUsed(); 4576 4577 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4578 ErrorTrap Trap(*this); 4579 4580 // C++0x [class.copy]p30: 4581 // The implicitly-defined or explicitly-defaulted copy assignment operator 4582 // for a non-union class X performs memberwise copy assignment of its 4583 // subobjects. The direct base classes of X are assigned first, in the 4584 // order of their declaration in the base-specifier-list, and then the 4585 // immediate non-static data members of X are assigned, in the order in 4586 // which they were declared in the class definition. 4587 4588 // The statements that form the synthesized function body. 4589 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4590 4591 // The parameter for the "other" object, which we are copying from. 4592 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4593 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4594 QualType OtherRefType = Other->getType(); 4595 if (const LValueReferenceType *OtherRef 4596 = OtherRefType->getAs<LValueReferenceType>()) { 4597 OtherRefType = OtherRef->getPointeeType(); 4598 OtherQuals = OtherRefType.getQualifiers(); 4599 } 4600 4601 // Our location for everything implicitly-generated. 4602 SourceLocation Loc = CopyAssignOperator->getLocation(); 4603 4604 // Construct a reference to the "other" object. We'll be using this 4605 // throughout the generated ASTs. 4606 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4607 assert(OtherRef && "Reference to parameter cannot fail!"); 4608 4609 // Construct the "this" pointer. We'll be using this throughout the generated 4610 // ASTs. 4611 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4612 assert(This && "Reference to this cannot fail!"); 4613 4614 // Assign base classes. 4615 bool Invalid = false; 4616 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4617 E = ClassDecl->bases_end(); Base != E; ++Base) { 4618 // Form the assignment: 4619 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4620 QualType BaseType = Base->getType().getUnqualifiedType(); 4621 CXXRecordDecl *BaseClassDecl = 0; 4622 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4623 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4624 else { 4625 Invalid = true; 4626 continue; 4627 } 4628 4629 // Construct the "from" expression, which is an implicit cast to the 4630 // appropriately-qualified base type. 4631 Expr *From = OtherRef->Retain(); 4632 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4633 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4634 CXXBaseSpecifierArray(Base)); 4635 4636 // Dereference "this". 4637 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4638 Owned(This->Retain())); 4639 4640 // Implicitly cast "this" to the appropriately-qualified base type. 4641 Expr *ToE = To.takeAs<Expr>(); 4642 ImpCastExprToType(ToE, 4643 Context.getCVRQualifiedType(BaseType, 4644 CopyAssignOperator->getTypeQualifiers()), 4645 CastExpr::CK_UncheckedDerivedToBase, 4646 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4647 To = Owned(ToE); 4648 4649 // Build the copy. 4650 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4651 move(To), Owned(From), 4652 /*CopyingBaseSubobject=*/true); 4653 if (Copy.isInvalid()) { 4654 Diag(CurrentLocation, diag::note_member_synthesized_at) 4655 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4656 CopyAssignOperator->setInvalidDecl(); 4657 return; 4658 } 4659 4660 // Success! Record the copy. 4661 Statements.push_back(Copy.takeAs<Expr>()); 4662 } 4663 4664 // \brief Reference to the __builtin_memcpy function. 4665 Expr *BuiltinMemCpyRef = 0; 4666 // \brief Reference to the __builtin_objc_memmove_collectable function. 4667 Expr *CollectableMemCpyRef = 0; 4668 4669 // Assign non-static members. 4670 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4671 FieldEnd = ClassDecl->field_end(); 4672 Field != FieldEnd; ++Field) { 4673 // Check for members of reference type; we can't copy those. 4674 if (Field->getType()->isReferenceType()) { 4675 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4676 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4677 Diag(Field->getLocation(), diag::note_declared_at); 4678 Diag(CurrentLocation, diag::note_member_synthesized_at) 4679 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4680 Invalid = true; 4681 continue; 4682 } 4683 4684 // Check for members of const-qualified, non-class type. 4685 QualType BaseType = Context.getBaseElementType(Field->getType()); 4686 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4687 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4688 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4689 Diag(Field->getLocation(), diag::note_declared_at); 4690 Diag(CurrentLocation, diag::note_member_synthesized_at) 4691 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4692 Invalid = true; 4693 continue; 4694 } 4695 4696 QualType FieldType = Field->getType().getNonReferenceType(); 4697 if (FieldType->isIncompleteArrayType()) { 4698 assert(ClassDecl->hasFlexibleArrayMember() && 4699 "Incomplete array type is not valid"); 4700 continue; 4701 } 4702 4703 // Build references to the field in the object we're copying from and to. 4704 CXXScopeSpec SS; // Intentionally empty 4705 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4706 LookupMemberName); 4707 MemberLookup.addDecl(*Field); 4708 MemberLookup.resolveKind(); 4709 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4710 OtherRefType, 4711 Loc, /*IsArrow=*/false, 4712 SS, 0, MemberLookup, 0); 4713 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4714 This->getType(), 4715 Loc, /*IsArrow=*/true, 4716 SS, 0, MemberLookup, 0); 4717 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4718 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4719 4720 // If the field should be copied with __builtin_memcpy rather than via 4721 // explicit assignments, do so. This optimization only applies for arrays 4722 // of scalars and arrays of class type with trivial copy-assignment 4723 // operators. 4724 if (FieldType->isArrayType() && 4725 (!BaseType->isRecordType() || 4726 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4727 ->hasTrivialCopyAssignment())) { 4728 // Compute the size of the memory buffer to be copied. 4729 QualType SizeType = Context.getSizeType(); 4730 llvm::APInt Size(Context.getTypeSize(SizeType), 4731 Context.getTypeSizeInChars(BaseType).getQuantity()); 4732 for (const ConstantArrayType *Array 4733 = Context.getAsConstantArrayType(FieldType); 4734 Array; 4735 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4736 llvm::APInt ArraySize = Array->getSize(); 4737 ArraySize.zextOrTrunc(Size.getBitWidth()); 4738 Size *= ArraySize; 4739 } 4740 4741 // Take the address of the field references for "from" and "to". 4742 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4743 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4744 4745 bool NeedsCollectableMemCpy = 4746 (BaseType->isRecordType() && 4747 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4748 4749 if (NeedsCollectableMemCpy) { 4750 if (!CollectableMemCpyRef) { 4751 // Create a reference to the __builtin_objc_memmove_collectable function. 4752 LookupResult R(*this, 4753 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4754 Loc, LookupOrdinaryName); 4755 LookupName(R, TUScope, true); 4756 4757 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4758 if (!CollectableMemCpy) { 4759 // Something went horribly wrong earlier, and we will have 4760 // complained about it. 4761 Invalid = true; 4762 continue; 4763 } 4764 4765 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4766 CollectableMemCpy->getType(), 4767 Loc, 0).takeAs<Expr>(); 4768 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4769 } 4770 } 4771 // Create a reference to the __builtin_memcpy builtin function. 4772 else if (!BuiltinMemCpyRef) { 4773 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4774 LookupOrdinaryName); 4775 LookupName(R, TUScope, true); 4776 4777 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4778 if (!BuiltinMemCpy) { 4779 // Something went horribly wrong earlier, and we will have complained 4780 // about it. 4781 Invalid = true; 4782 continue; 4783 } 4784 4785 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4786 BuiltinMemCpy->getType(), 4787 Loc, 0).takeAs<Expr>(); 4788 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4789 } 4790 4791 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4792 CallArgs.push_back(To.takeAs<Expr>()); 4793 CallArgs.push_back(From.takeAs<Expr>()); 4794 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4795 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4796 Commas.push_back(Loc); 4797 Commas.push_back(Loc); 4798 OwningExprResult Call = ExprError(); 4799 if (NeedsCollectableMemCpy) 4800 Call = ActOnCallExpr(/*Scope=*/0, 4801 Owned(CollectableMemCpyRef->Retain()), 4802 Loc, move_arg(CallArgs), 4803 Commas.data(), Loc); 4804 else 4805 Call = ActOnCallExpr(/*Scope=*/0, 4806 Owned(BuiltinMemCpyRef->Retain()), 4807 Loc, move_arg(CallArgs), 4808 Commas.data(), Loc); 4809 4810 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4811 Statements.push_back(Call.takeAs<Expr>()); 4812 continue; 4813 } 4814 4815 // Build the copy of this field. 4816 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4817 move(To), move(From), 4818 /*CopyingBaseSubobject=*/false); 4819 if (Copy.isInvalid()) { 4820 Diag(CurrentLocation, diag::note_member_synthesized_at) 4821 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4822 CopyAssignOperator->setInvalidDecl(); 4823 return; 4824 } 4825 4826 // Success! Record the copy. 4827 Statements.push_back(Copy.takeAs<Stmt>()); 4828 } 4829 4830 if (!Invalid) { 4831 // Add a "return *this;" 4832 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4833 Owned(This->Retain())); 4834 4835 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4836 if (Return.isInvalid()) 4837 Invalid = true; 4838 else { 4839 Statements.push_back(Return.takeAs<Stmt>()); 4840 4841 if (Trap.hasErrorOccurred()) { 4842 Diag(CurrentLocation, diag::note_member_synthesized_at) 4843 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4844 Invalid = true; 4845 } 4846 } 4847 } 4848 4849 if (Invalid) { 4850 CopyAssignOperator->setInvalidDecl(); 4851 return; 4852 } 4853 4854 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4855 /*isStmtExpr=*/false); 4856 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4857 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4858} 4859 4860void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4861 CXXConstructorDecl *CopyConstructor, 4862 unsigned TypeQuals) { 4863 assert((CopyConstructor->isImplicit() && 4864 CopyConstructor->isCopyConstructor(TypeQuals) && 4865 !CopyConstructor->isUsed(false)) && 4866 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4867 4868 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4869 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4870 4871 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4872 ErrorTrap Trap(*this); 4873 4874 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4875 Trap.hasErrorOccurred()) { 4876 Diag(CurrentLocation, diag::note_member_synthesized_at) 4877 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4878 CopyConstructor->setInvalidDecl(); 4879 } else { 4880 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4881 CopyConstructor->getLocation(), 4882 MultiStmtArg(*this, 0, 0), 4883 /*isStmtExpr=*/false) 4884 .takeAs<Stmt>()); 4885 } 4886 4887 CopyConstructor->setUsed(); 4888} 4889 4890Sema::OwningExprResult 4891Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4892 CXXConstructorDecl *Constructor, 4893 MultiExprArg ExprArgs, 4894 bool RequiresZeroInit, 4895 CXXConstructExpr::ConstructionKind ConstructKind) { 4896 bool Elidable = false; 4897 4898 // C++0x [class.copy]p34: 4899 // When certain criteria are met, an implementation is allowed to 4900 // omit the copy/move construction of a class object, even if the 4901 // copy/move constructor and/or destructor for the object have 4902 // side effects. [...] 4903 // - when a temporary class object that has not been bound to a 4904 // reference (12.2) would be copied/moved to a class object 4905 // with the same cv-unqualified type, the copy/move operation 4906 // can be omitted by constructing the temporary object 4907 // directly into the target of the omitted copy/move 4908 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4909 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4910 Elidable = SubExpr->isTemporaryObject() && 4911 Context.hasSameUnqualifiedType(SubExpr->getType(), 4912 Context.getTypeDeclType(Constructor->getParent())); 4913 } 4914 4915 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4916 Elidable, move(ExprArgs), RequiresZeroInit, 4917 ConstructKind); 4918} 4919 4920/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4921/// including handling of its default argument expressions. 4922Sema::OwningExprResult 4923Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4924 CXXConstructorDecl *Constructor, bool Elidable, 4925 MultiExprArg ExprArgs, 4926 bool RequiresZeroInit, 4927 CXXConstructExpr::ConstructionKind ConstructKind) { 4928 unsigned NumExprs = ExprArgs.size(); 4929 Expr **Exprs = (Expr **)ExprArgs.release(); 4930 4931 MarkDeclarationReferenced(ConstructLoc, Constructor); 4932 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4933 Constructor, Elidable, Exprs, NumExprs, 4934 RequiresZeroInit, ConstructKind)); 4935} 4936 4937bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4938 CXXConstructorDecl *Constructor, 4939 MultiExprArg Exprs) { 4940 OwningExprResult TempResult = 4941 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4942 move(Exprs)); 4943 if (TempResult.isInvalid()) 4944 return true; 4945 4946 Expr *Temp = TempResult.takeAs<Expr>(); 4947 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4948 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4949 VD->setInit(Temp); 4950 4951 return false; 4952} 4953 4954void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4955 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4956 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4957 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 4958 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4959 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4960 CheckDestructorAccess(VD->getLocation(), Destructor, 4961 PDiag(diag::err_access_dtor_var) 4962 << VD->getDeclName() 4963 << VD->getType()); 4964 } 4965} 4966 4967/// AddCXXDirectInitializerToDecl - This action is called immediately after 4968/// ActOnDeclarator, when a C++ direct initializer is present. 4969/// e.g: "int x(1);" 4970void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4971 SourceLocation LParenLoc, 4972 MultiExprArg Exprs, 4973 SourceLocation *CommaLocs, 4974 SourceLocation RParenLoc) { 4975 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4976 Decl *RealDecl = Dcl.getAs<Decl>(); 4977 4978 // If there is no declaration, there was an error parsing it. Just ignore 4979 // the initializer. 4980 if (RealDecl == 0) 4981 return; 4982 4983 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4984 if (!VDecl) { 4985 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4986 RealDecl->setInvalidDecl(); 4987 return; 4988 } 4989 4990 // We will represent direct-initialization similarly to copy-initialization: 4991 // int x(1); -as-> int x = 1; 4992 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4993 // 4994 // Clients that want to distinguish between the two forms, can check for 4995 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4996 // A major benefit is that clients that don't particularly care about which 4997 // exactly form was it (like the CodeGen) can handle both cases without 4998 // special case code. 4999 5000 // C++ 8.5p11: 5001 // The form of initialization (using parentheses or '=') is generally 5002 // insignificant, but does matter when the entity being initialized has a 5003 // class type. 5004 QualType DeclInitType = VDecl->getType(); 5005 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 5006 DeclInitType = Context.getBaseElementType(Array); 5007 5008 if (!VDecl->getType()->isDependentType() && 5009 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5010 diag::err_typecheck_decl_incomplete_type)) { 5011 VDecl->setInvalidDecl(); 5012 return; 5013 } 5014 5015 // The variable can not have an abstract class type. 5016 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5017 diag::err_abstract_type_in_decl, 5018 AbstractVariableType)) 5019 VDecl->setInvalidDecl(); 5020 5021 const VarDecl *Def; 5022 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5023 Diag(VDecl->getLocation(), diag::err_redefinition) 5024 << VDecl->getDeclName(); 5025 Diag(Def->getLocation(), diag::note_previous_definition); 5026 VDecl->setInvalidDecl(); 5027 return; 5028 } 5029 5030 // If either the declaration has a dependent type or if any of the 5031 // expressions is type-dependent, we represent the initialization 5032 // via a ParenListExpr for later use during template instantiation. 5033 if (VDecl->getType()->isDependentType() || 5034 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5035 // Let clients know that initialization was done with a direct initializer. 5036 VDecl->setCXXDirectInitializer(true); 5037 5038 // Store the initialization expressions as a ParenListExpr. 5039 unsigned NumExprs = Exprs.size(); 5040 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5041 (Expr **)Exprs.release(), 5042 NumExprs, RParenLoc)); 5043 return; 5044 } 5045 5046 // Capture the variable that is being initialized and the style of 5047 // initialization. 5048 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5049 5050 // FIXME: Poor source location information. 5051 InitializationKind Kind 5052 = InitializationKind::CreateDirect(VDecl->getLocation(), 5053 LParenLoc, RParenLoc); 5054 5055 InitializationSequence InitSeq(*this, Entity, Kind, 5056 (Expr**)Exprs.get(), Exprs.size()); 5057 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5058 if (Result.isInvalid()) { 5059 VDecl->setInvalidDecl(); 5060 return; 5061 } 5062 5063 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5064 VDecl->setInit(Result.takeAs<Expr>()); 5065 VDecl->setCXXDirectInitializer(true); 5066 5067 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5068 FinalizeVarWithDestructor(VDecl, Record); 5069} 5070 5071/// \brief Given a constructor and the set of arguments provided for the 5072/// constructor, convert the arguments and add any required default arguments 5073/// to form a proper call to this constructor. 5074/// 5075/// \returns true if an error occurred, false otherwise. 5076bool 5077Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5078 MultiExprArg ArgsPtr, 5079 SourceLocation Loc, 5080 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5081 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5082 unsigned NumArgs = ArgsPtr.size(); 5083 Expr **Args = (Expr **)ArgsPtr.get(); 5084 5085 const FunctionProtoType *Proto 5086 = Constructor->getType()->getAs<FunctionProtoType>(); 5087 assert(Proto && "Constructor without a prototype?"); 5088 unsigned NumArgsInProto = Proto->getNumArgs(); 5089 5090 // If too few arguments are available, we'll fill in the rest with defaults. 5091 if (NumArgs < NumArgsInProto) 5092 ConvertedArgs.reserve(NumArgsInProto); 5093 else 5094 ConvertedArgs.reserve(NumArgs); 5095 5096 VariadicCallType CallType = 5097 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5098 llvm::SmallVector<Expr *, 8> AllArgs; 5099 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5100 Proto, 0, Args, NumArgs, AllArgs, 5101 CallType); 5102 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5103 ConvertedArgs.push_back(AllArgs[i]); 5104 return Invalid; 5105} 5106 5107static inline bool 5108CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5109 const FunctionDecl *FnDecl) { 5110 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5111 if (isa<NamespaceDecl>(DC)) { 5112 return SemaRef.Diag(FnDecl->getLocation(), 5113 diag::err_operator_new_delete_declared_in_namespace) 5114 << FnDecl->getDeclName(); 5115 } 5116 5117 if (isa<TranslationUnitDecl>(DC) && 5118 FnDecl->getStorageClass() == FunctionDecl::Static) { 5119 return SemaRef.Diag(FnDecl->getLocation(), 5120 diag::err_operator_new_delete_declared_static) 5121 << FnDecl->getDeclName(); 5122 } 5123 5124 return false; 5125} 5126 5127static inline bool 5128CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5129 CanQualType ExpectedResultType, 5130 CanQualType ExpectedFirstParamType, 5131 unsigned DependentParamTypeDiag, 5132 unsigned InvalidParamTypeDiag) { 5133 QualType ResultType = 5134 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5135 5136 // Check that the result type is not dependent. 5137 if (ResultType->isDependentType()) 5138 return SemaRef.Diag(FnDecl->getLocation(), 5139 diag::err_operator_new_delete_dependent_result_type) 5140 << FnDecl->getDeclName() << ExpectedResultType; 5141 5142 // Check that the result type is what we expect. 5143 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5144 return SemaRef.Diag(FnDecl->getLocation(), 5145 diag::err_operator_new_delete_invalid_result_type) 5146 << FnDecl->getDeclName() << ExpectedResultType; 5147 5148 // A function template must have at least 2 parameters. 5149 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5150 return SemaRef.Diag(FnDecl->getLocation(), 5151 diag::err_operator_new_delete_template_too_few_parameters) 5152 << FnDecl->getDeclName(); 5153 5154 // The function decl must have at least 1 parameter. 5155 if (FnDecl->getNumParams() == 0) 5156 return SemaRef.Diag(FnDecl->getLocation(), 5157 diag::err_operator_new_delete_too_few_parameters) 5158 << FnDecl->getDeclName(); 5159 5160 // Check the the first parameter type is not dependent. 5161 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5162 if (FirstParamType->isDependentType()) 5163 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5164 << FnDecl->getDeclName() << ExpectedFirstParamType; 5165 5166 // Check that the first parameter type is what we expect. 5167 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5168 ExpectedFirstParamType) 5169 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5170 << FnDecl->getDeclName() << ExpectedFirstParamType; 5171 5172 return false; 5173} 5174 5175static bool 5176CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5177 // C++ [basic.stc.dynamic.allocation]p1: 5178 // A program is ill-formed if an allocation function is declared in a 5179 // namespace scope other than global scope or declared static in global 5180 // scope. 5181 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5182 return true; 5183 5184 CanQualType SizeTy = 5185 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5186 5187 // C++ [basic.stc.dynamic.allocation]p1: 5188 // The return type shall be void*. The first parameter shall have type 5189 // std::size_t. 5190 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5191 SizeTy, 5192 diag::err_operator_new_dependent_param_type, 5193 diag::err_operator_new_param_type)) 5194 return true; 5195 5196 // C++ [basic.stc.dynamic.allocation]p1: 5197 // The first parameter shall not have an associated default argument. 5198 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5199 return SemaRef.Diag(FnDecl->getLocation(), 5200 diag::err_operator_new_default_arg) 5201 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5202 5203 return false; 5204} 5205 5206static bool 5207CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5208 // C++ [basic.stc.dynamic.deallocation]p1: 5209 // A program is ill-formed if deallocation functions are declared in a 5210 // namespace scope other than global scope or declared static in global 5211 // scope. 5212 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5213 return true; 5214 5215 // C++ [basic.stc.dynamic.deallocation]p2: 5216 // Each deallocation function shall return void and its first parameter 5217 // shall be void*. 5218 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5219 SemaRef.Context.VoidPtrTy, 5220 diag::err_operator_delete_dependent_param_type, 5221 diag::err_operator_delete_param_type)) 5222 return true; 5223 5224 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5225 if (FirstParamType->isDependentType()) 5226 return SemaRef.Diag(FnDecl->getLocation(), 5227 diag::err_operator_delete_dependent_param_type) 5228 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5229 5230 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5231 SemaRef.Context.VoidPtrTy) 5232 return SemaRef.Diag(FnDecl->getLocation(), 5233 diag::err_operator_delete_param_type) 5234 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5235 5236 return false; 5237} 5238 5239/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5240/// of this overloaded operator is well-formed. If so, returns false; 5241/// otherwise, emits appropriate diagnostics and returns true. 5242bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5243 assert(FnDecl && FnDecl->isOverloadedOperator() && 5244 "Expected an overloaded operator declaration"); 5245 5246 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5247 5248 // C++ [over.oper]p5: 5249 // The allocation and deallocation functions, operator new, 5250 // operator new[], operator delete and operator delete[], are 5251 // described completely in 3.7.3. The attributes and restrictions 5252 // found in the rest of this subclause do not apply to them unless 5253 // explicitly stated in 3.7.3. 5254 if (Op == OO_Delete || Op == OO_Array_Delete) 5255 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5256 5257 if (Op == OO_New || Op == OO_Array_New) 5258 return CheckOperatorNewDeclaration(*this, FnDecl); 5259 5260 // C++ [over.oper]p6: 5261 // An operator function shall either be a non-static member 5262 // function or be a non-member function and have at least one 5263 // parameter whose type is a class, a reference to a class, an 5264 // enumeration, or a reference to an enumeration. 5265 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5266 if (MethodDecl->isStatic()) 5267 return Diag(FnDecl->getLocation(), 5268 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5269 } else { 5270 bool ClassOrEnumParam = false; 5271 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5272 ParamEnd = FnDecl->param_end(); 5273 Param != ParamEnd; ++Param) { 5274 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5275 if (ParamType->isDependentType() || ParamType->isRecordType() || 5276 ParamType->isEnumeralType()) { 5277 ClassOrEnumParam = true; 5278 break; 5279 } 5280 } 5281 5282 if (!ClassOrEnumParam) 5283 return Diag(FnDecl->getLocation(), 5284 diag::err_operator_overload_needs_class_or_enum) 5285 << FnDecl->getDeclName(); 5286 } 5287 5288 // C++ [over.oper]p8: 5289 // An operator function cannot have default arguments (8.3.6), 5290 // except where explicitly stated below. 5291 // 5292 // Only the function-call operator allows default arguments 5293 // (C++ [over.call]p1). 5294 if (Op != OO_Call) { 5295 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5296 Param != FnDecl->param_end(); ++Param) { 5297 if ((*Param)->hasDefaultArg()) 5298 return Diag((*Param)->getLocation(), 5299 diag::err_operator_overload_default_arg) 5300 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5301 } 5302 } 5303 5304 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5305 { false, false, false } 5306#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5307 , { Unary, Binary, MemberOnly } 5308#include "clang/Basic/OperatorKinds.def" 5309 }; 5310 5311 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5312 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5313 bool MustBeMemberOperator = OperatorUses[Op][2]; 5314 5315 // C++ [over.oper]p8: 5316 // [...] Operator functions cannot have more or fewer parameters 5317 // than the number required for the corresponding operator, as 5318 // described in the rest of this subclause. 5319 unsigned NumParams = FnDecl->getNumParams() 5320 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5321 if (Op != OO_Call && 5322 ((NumParams == 1 && !CanBeUnaryOperator) || 5323 (NumParams == 2 && !CanBeBinaryOperator) || 5324 (NumParams < 1) || (NumParams > 2))) { 5325 // We have the wrong number of parameters. 5326 unsigned ErrorKind; 5327 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5328 ErrorKind = 2; // 2 -> unary or binary. 5329 } else if (CanBeUnaryOperator) { 5330 ErrorKind = 0; // 0 -> unary 5331 } else { 5332 assert(CanBeBinaryOperator && 5333 "All non-call overloaded operators are unary or binary!"); 5334 ErrorKind = 1; // 1 -> binary 5335 } 5336 5337 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5338 << FnDecl->getDeclName() << NumParams << ErrorKind; 5339 } 5340 5341 // Overloaded operators other than operator() cannot be variadic. 5342 if (Op != OO_Call && 5343 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5344 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5345 << FnDecl->getDeclName(); 5346 } 5347 5348 // Some operators must be non-static member functions. 5349 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5350 return Diag(FnDecl->getLocation(), 5351 diag::err_operator_overload_must_be_member) 5352 << FnDecl->getDeclName(); 5353 } 5354 5355 // C++ [over.inc]p1: 5356 // The user-defined function called operator++ implements the 5357 // prefix and postfix ++ operator. If this function is a member 5358 // function with no parameters, or a non-member function with one 5359 // parameter of class or enumeration type, it defines the prefix 5360 // increment operator ++ for objects of that type. If the function 5361 // is a member function with one parameter (which shall be of type 5362 // int) or a non-member function with two parameters (the second 5363 // of which shall be of type int), it defines the postfix 5364 // increment operator ++ for objects of that type. 5365 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5366 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5367 bool ParamIsInt = false; 5368 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5369 ParamIsInt = BT->getKind() == BuiltinType::Int; 5370 5371 if (!ParamIsInt) 5372 return Diag(LastParam->getLocation(), 5373 diag::err_operator_overload_post_incdec_must_be_int) 5374 << LastParam->getType() << (Op == OO_MinusMinus); 5375 } 5376 5377 // Notify the class if it got an assignment operator. 5378 if (Op == OO_Equal) { 5379 // Would have returned earlier otherwise. 5380 assert(isa<CXXMethodDecl>(FnDecl) && 5381 "Overloaded = not member, but not filtered."); 5382 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5383 Method->getParent()->addedAssignmentOperator(Context, Method); 5384 } 5385 5386 return false; 5387} 5388 5389/// CheckLiteralOperatorDeclaration - Check whether the declaration 5390/// of this literal operator function is well-formed. If so, returns 5391/// false; otherwise, emits appropriate diagnostics and returns true. 5392bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5393 DeclContext *DC = FnDecl->getDeclContext(); 5394 Decl::Kind Kind = DC->getDeclKind(); 5395 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5396 Kind != Decl::LinkageSpec) { 5397 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5398 << FnDecl->getDeclName(); 5399 return true; 5400 } 5401 5402 bool Valid = false; 5403 5404 // template <char...> type operator "" name() is the only valid template 5405 // signature, and the only valid signature with no parameters. 5406 if (FnDecl->param_size() == 0) { 5407 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5408 // Must have only one template parameter 5409 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5410 if (Params->size() == 1) { 5411 NonTypeTemplateParmDecl *PmDecl = 5412 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5413 5414 // The template parameter must be a char parameter pack. 5415 // FIXME: This test will always fail because non-type parameter packs 5416 // have not been implemented. 5417 if (PmDecl && PmDecl->isTemplateParameterPack() && 5418 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5419 Valid = true; 5420 } 5421 } 5422 } else { 5423 // Check the first parameter 5424 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5425 5426 QualType T = (*Param)->getType(); 5427 5428 // unsigned long long int, long double, and any character type are allowed 5429 // as the only parameters. 5430 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5431 Context.hasSameType(T, Context.LongDoubleTy) || 5432 Context.hasSameType(T, Context.CharTy) || 5433 Context.hasSameType(T, Context.WCharTy) || 5434 Context.hasSameType(T, Context.Char16Ty) || 5435 Context.hasSameType(T, Context.Char32Ty)) { 5436 if (++Param == FnDecl->param_end()) 5437 Valid = true; 5438 goto FinishedParams; 5439 } 5440 5441 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5442 const PointerType *PT = T->getAs<PointerType>(); 5443 if (!PT) 5444 goto FinishedParams; 5445 T = PT->getPointeeType(); 5446 if (!T.isConstQualified()) 5447 goto FinishedParams; 5448 T = T.getUnqualifiedType(); 5449 5450 // Move on to the second parameter; 5451 ++Param; 5452 5453 // If there is no second parameter, the first must be a const char * 5454 if (Param == FnDecl->param_end()) { 5455 if (Context.hasSameType(T, Context.CharTy)) 5456 Valid = true; 5457 goto FinishedParams; 5458 } 5459 5460 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5461 // are allowed as the first parameter to a two-parameter function 5462 if (!(Context.hasSameType(T, Context.CharTy) || 5463 Context.hasSameType(T, Context.WCharTy) || 5464 Context.hasSameType(T, Context.Char16Ty) || 5465 Context.hasSameType(T, Context.Char32Ty))) 5466 goto FinishedParams; 5467 5468 // The second and final parameter must be an std::size_t 5469 T = (*Param)->getType().getUnqualifiedType(); 5470 if (Context.hasSameType(T, Context.getSizeType()) && 5471 ++Param == FnDecl->param_end()) 5472 Valid = true; 5473 } 5474 5475 // FIXME: This diagnostic is absolutely terrible. 5476FinishedParams: 5477 if (!Valid) { 5478 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5479 << FnDecl->getDeclName(); 5480 return true; 5481 } 5482 5483 return false; 5484} 5485 5486/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5487/// linkage specification, including the language and (if present) 5488/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5489/// the location of the language string literal, which is provided 5490/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5491/// the '{' brace. Otherwise, this linkage specification does not 5492/// have any braces. 5493Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5494 SourceLocation ExternLoc, 5495 SourceLocation LangLoc, 5496 llvm::StringRef Lang, 5497 SourceLocation LBraceLoc) { 5498 LinkageSpecDecl::LanguageIDs Language; 5499 if (Lang == "\"C\"") 5500 Language = LinkageSpecDecl::lang_c; 5501 else if (Lang == "\"C++\"") 5502 Language = LinkageSpecDecl::lang_cxx; 5503 else { 5504 Diag(LangLoc, diag::err_bad_language); 5505 return DeclPtrTy(); 5506 } 5507 5508 // FIXME: Add all the various semantics of linkage specifications 5509 5510 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5511 LangLoc, Language, 5512 LBraceLoc.isValid()); 5513 CurContext->addDecl(D); 5514 PushDeclContext(S, D); 5515 return DeclPtrTy::make(D); 5516} 5517 5518/// ActOnFinishLinkageSpecification - Completely the definition of 5519/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5520/// valid, it's the position of the closing '}' brace in a linkage 5521/// specification that uses braces. 5522Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5523 DeclPtrTy LinkageSpec, 5524 SourceLocation RBraceLoc) { 5525 if (LinkageSpec) 5526 PopDeclContext(); 5527 return LinkageSpec; 5528} 5529 5530/// \brief Perform semantic analysis for the variable declaration that 5531/// occurs within a C++ catch clause, returning the newly-created 5532/// variable. 5533VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5534 TypeSourceInfo *TInfo, 5535 IdentifierInfo *Name, 5536 SourceLocation Loc, 5537 SourceRange Range) { 5538 bool Invalid = false; 5539 5540 // Arrays and functions decay. 5541 if (ExDeclType->isArrayType()) 5542 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5543 else if (ExDeclType->isFunctionType()) 5544 ExDeclType = Context.getPointerType(ExDeclType); 5545 5546 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5547 // The exception-declaration shall not denote a pointer or reference to an 5548 // incomplete type, other than [cv] void*. 5549 // N2844 forbids rvalue references. 5550 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5551 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5552 Invalid = true; 5553 } 5554 5555 // GCC allows catching pointers and references to incomplete types 5556 // as an extension; so do we, but we warn by default. 5557 5558 QualType BaseType = ExDeclType; 5559 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5560 unsigned DK = diag::err_catch_incomplete; 5561 bool IncompleteCatchIsInvalid = true; 5562 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5563 BaseType = Ptr->getPointeeType(); 5564 Mode = 1; 5565 DK = diag::ext_catch_incomplete_ptr; 5566 IncompleteCatchIsInvalid = false; 5567 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5568 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5569 BaseType = Ref->getPointeeType(); 5570 Mode = 2; 5571 DK = diag::ext_catch_incomplete_ref; 5572 IncompleteCatchIsInvalid = false; 5573 } 5574 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5575 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5576 IncompleteCatchIsInvalid) 5577 Invalid = true; 5578 5579 if (!Invalid && !ExDeclType->isDependentType() && 5580 RequireNonAbstractType(Loc, ExDeclType, 5581 diag::err_abstract_type_in_decl, 5582 AbstractVariableType)) 5583 Invalid = true; 5584 5585 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5586 Name, ExDeclType, TInfo, VarDecl::None, 5587 VarDecl::None); 5588 ExDecl->setExceptionVariable(true); 5589 5590 if (!Invalid) { 5591 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5592 // C++ [except.handle]p16: 5593 // The object declared in an exception-declaration or, if the 5594 // exception-declaration does not specify a name, a temporary (12.2) is 5595 // copy-initialized (8.5) from the exception object. [...] 5596 // The object is destroyed when the handler exits, after the destruction 5597 // of any automatic objects initialized within the handler. 5598 // 5599 // We just pretend to initialize the object with itself, then make sure 5600 // it can be destroyed later. 5601 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5602 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5603 Loc, ExDeclType, 0); 5604 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5605 SourceLocation()); 5606 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5607 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5608 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5609 if (Result.isInvalid()) 5610 Invalid = true; 5611 else 5612 FinalizeVarWithDestructor(ExDecl, RecordTy); 5613 } 5614 } 5615 5616 if (Invalid) 5617 ExDecl->setInvalidDecl(); 5618 5619 return ExDecl; 5620} 5621 5622/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5623/// handler. 5624Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5625 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5626 QualType ExDeclType = TInfo->getType(); 5627 5628 bool Invalid = D.isInvalidType(); 5629 IdentifierInfo *II = D.getIdentifier(); 5630 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5631 LookupOrdinaryName, 5632 ForRedeclaration)) { 5633 // The scope should be freshly made just for us. There is just no way 5634 // it contains any previous declaration. 5635 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5636 if (PrevDecl->isTemplateParameter()) { 5637 // Maybe we will complain about the shadowed template parameter. 5638 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5639 } 5640 } 5641 5642 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5643 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5644 << D.getCXXScopeSpec().getRange(); 5645 Invalid = true; 5646 } 5647 5648 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5649 D.getIdentifier(), 5650 D.getIdentifierLoc(), 5651 D.getDeclSpec().getSourceRange()); 5652 5653 if (Invalid) 5654 ExDecl->setInvalidDecl(); 5655 5656 // Add the exception declaration into this scope. 5657 if (II) 5658 PushOnScopeChains(ExDecl, S); 5659 else 5660 CurContext->addDecl(ExDecl); 5661 5662 ProcessDeclAttributes(S, ExDecl, D); 5663 return DeclPtrTy::make(ExDecl); 5664} 5665 5666Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5667 ExprArg assertexpr, 5668 ExprArg assertmessageexpr) { 5669 Expr *AssertExpr = (Expr *)assertexpr.get(); 5670 StringLiteral *AssertMessage = 5671 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5672 5673 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5674 llvm::APSInt Value(32); 5675 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5676 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5677 AssertExpr->getSourceRange(); 5678 return DeclPtrTy(); 5679 } 5680 5681 if (Value == 0) { 5682 Diag(AssertLoc, diag::err_static_assert_failed) 5683 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5684 } 5685 } 5686 5687 assertexpr.release(); 5688 assertmessageexpr.release(); 5689 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5690 AssertExpr, AssertMessage); 5691 5692 CurContext->addDecl(Decl); 5693 return DeclPtrTy::make(Decl); 5694} 5695 5696/// \brief Perform semantic analysis of the given friend type declaration. 5697/// 5698/// \returns A friend declaration that. 5699FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5700 TypeSourceInfo *TSInfo) { 5701 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5702 5703 QualType T = TSInfo->getType(); 5704 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5705 5706 if (!getLangOptions().CPlusPlus0x) { 5707 // C++03 [class.friend]p2: 5708 // An elaborated-type-specifier shall be used in a friend declaration 5709 // for a class.* 5710 // 5711 // * The class-key of the elaborated-type-specifier is required. 5712 if (!ActiveTemplateInstantiations.empty()) { 5713 // Do not complain about the form of friend template types during 5714 // template instantiation; we will already have complained when the 5715 // template was declared. 5716 } else if (!T->isElaboratedTypeSpecifier()) { 5717 // If we evaluated the type to a record type, suggest putting 5718 // a tag in front. 5719 if (const RecordType *RT = T->getAs<RecordType>()) { 5720 RecordDecl *RD = RT->getDecl(); 5721 5722 std::string InsertionText = std::string(" ") + RD->getKindName(); 5723 5724 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5725 << (unsigned) RD->getTagKind() 5726 << T 5727 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5728 InsertionText); 5729 } else { 5730 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5731 << T 5732 << SourceRange(FriendLoc, TypeRange.getEnd()); 5733 } 5734 } else if (T->getAs<EnumType>()) { 5735 Diag(FriendLoc, diag::ext_enum_friend) 5736 << T 5737 << SourceRange(FriendLoc, TypeRange.getEnd()); 5738 } 5739 } 5740 5741 // C++0x [class.friend]p3: 5742 // If the type specifier in a friend declaration designates a (possibly 5743 // cv-qualified) class type, that class is declared as a friend; otherwise, 5744 // the friend declaration is ignored. 5745 5746 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5747 // in [class.friend]p3 that we do not implement. 5748 5749 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5750} 5751 5752/// Handle a friend type declaration. This works in tandem with 5753/// ActOnTag. 5754/// 5755/// Notes on friend class templates: 5756/// 5757/// We generally treat friend class declarations as if they were 5758/// declaring a class. So, for example, the elaborated type specifier 5759/// in a friend declaration is required to obey the restrictions of a 5760/// class-head (i.e. no typedefs in the scope chain), template 5761/// parameters are required to match up with simple template-ids, &c. 5762/// However, unlike when declaring a template specialization, it's 5763/// okay to refer to a template specialization without an empty 5764/// template parameter declaration, e.g. 5765/// friend class A<T>::B<unsigned>; 5766/// We permit this as a special case; if there are any template 5767/// parameters present at all, require proper matching, i.e. 5768/// template <> template <class T> friend class A<int>::B; 5769Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5770 MultiTemplateParamsArg TempParams) { 5771 SourceLocation Loc = DS.getSourceRange().getBegin(); 5772 5773 assert(DS.isFriendSpecified()); 5774 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5775 5776 // Try to convert the decl specifier to a type. This works for 5777 // friend templates because ActOnTag never produces a ClassTemplateDecl 5778 // for a TUK_Friend. 5779 Declarator TheDeclarator(DS, Declarator::MemberContext); 5780 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 5781 QualType T = TSI->getType(); 5782 if (TheDeclarator.isInvalidType()) 5783 return DeclPtrTy(); 5784 5785 // This is definitely an error in C++98. It's probably meant to 5786 // be forbidden in C++0x, too, but the specification is just 5787 // poorly written. 5788 // 5789 // The problem is with declarations like the following: 5790 // template <T> friend A<T>::foo; 5791 // where deciding whether a class C is a friend or not now hinges 5792 // on whether there exists an instantiation of A that causes 5793 // 'foo' to equal C. There are restrictions on class-heads 5794 // (which we declare (by fiat) elaborated friend declarations to 5795 // be) that makes this tractable. 5796 // 5797 // FIXME: handle "template <> friend class A<T>;", which 5798 // is possibly well-formed? Who even knows? 5799 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5800 Diag(Loc, diag::err_tagless_friend_type_template) 5801 << DS.getSourceRange(); 5802 return DeclPtrTy(); 5803 } 5804 5805 // C++98 [class.friend]p1: A friend of a class is a function 5806 // or class that is not a member of the class . . . 5807 // This is fixed in DR77, which just barely didn't make the C++03 5808 // deadline. It's also a very silly restriction that seriously 5809 // affects inner classes and which nobody else seems to implement; 5810 // thus we never diagnose it, not even in -pedantic. 5811 // 5812 // But note that we could warn about it: it's always useless to 5813 // friend one of your own members (it's not, however, worthless to 5814 // friend a member of an arbitrary specialization of your template). 5815 5816 Decl *D; 5817 if (unsigned NumTempParamLists = TempParams.size()) 5818 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5819 NumTempParamLists, 5820 (TemplateParameterList**) TempParams.release(), 5821 TSI, 5822 DS.getFriendSpecLoc()); 5823 else 5824 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5825 5826 if (!D) 5827 return DeclPtrTy(); 5828 5829 D->setAccess(AS_public); 5830 CurContext->addDecl(D); 5831 5832 return DeclPtrTy::make(D); 5833} 5834 5835Sema::DeclPtrTy 5836Sema::ActOnFriendFunctionDecl(Scope *S, 5837 Declarator &D, 5838 bool IsDefinition, 5839 MultiTemplateParamsArg TemplateParams) { 5840 const DeclSpec &DS = D.getDeclSpec(); 5841 5842 assert(DS.isFriendSpecified()); 5843 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5844 5845 SourceLocation Loc = D.getIdentifierLoc(); 5846 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5847 QualType T = TInfo->getType(); 5848 5849 // C++ [class.friend]p1 5850 // A friend of a class is a function or class.... 5851 // Note that this sees through typedefs, which is intended. 5852 // It *doesn't* see through dependent types, which is correct 5853 // according to [temp.arg.type]p3: 5854 // If a declaration acquires a function type through a 5855 // type dependent on a template-parameter and this causes 5856 // a declaration that does not use the syntactic form of a 5857 // function declarator to have a function type, the program 5858 // is ill-formed. 5859 if (!T->isFunctionType()) { 5860 Diag(Loc, diag::err_unexpected_friend); 5861 5862 // It might be worthwhile to try to recover by creating an 5863 // appropriate declaration. 5864 return DeclPtrTy(); 5865 } 5866 5867 // C++ [namespace.memdef]p3 5868 // - If a friend declaration in a non-local class first declares a 5869 // class or function, the friend class or function is a member 5870 // of the innermost enclosing namespace. 5871 // - The name of the friend is not found by simple name lookup 5872 // until a matching declaration is provided in that namespace 5873 // scope (either before or after the class declaration granting 5874 // friendship). 5875 // - If a friend function is called, its name may be found by the 5876 // name lookup that considers functions from namespaces and 5877 // classes associated with the types of the function arguments. 5878 // - When looking for a prior declaration of a class or a function 5879 // declared as a friend, scopes outside the innermost enclosing 5880 // namespace scope are not considered. 5881 5882 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5883 DeclarationName Name = GetNameForDeclarator(D); 5884 assert(Name); 5885 5886 // The context we found the declaration in, or in which we should 5887 // create the declaration. 5888 DeclContext *DC; 5889 5890 // FIXME: handle local classes 5891 5892 // Recover from invalid scope qualifiers as if they just weren't there. 5893 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5894 ForRedeclaration); 5895 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5896 DC = computeDeclContext(ScopeQual); 5897 5898 // FIXME: handle dependent contexts 5899 if (!DC) return DeclPtrTy(); 5900 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5901 5902 LookupQualifiedName(Previous, DC); 5903 5904 // Ignore things found implicitly in the wrong scope. 5905 // TODO: better diagnostics for this case. Suggesting the right 5906 // qualified scope would be nice... 5907 LookupResult::Filter F = Previous.makeFilter(); 5908 while (F.hasNext()) { 5909 NamedDecl *D = F.next(); 5910 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 5911 F.erase(); 5912 } 5913 F.done(); 5914 5915 if (Previous.empty()) { 5916 D.setInvalidType(); 5917 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5918 return DeclPtrTy(); 5919 } 5920 5921 // C++ [class.friend]p1: A friend of a class is a function or 5922 // class that is not a member of the class . . . 5923 if (DC->Equals(CurContext)) 5924 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5925 5926 // Otherwise walk out to the nearest namespace scope looking for matches. 5927 } else { 5928 // TODO: handle local class contexts. 5929 5930 DC = CurContext; 5931 while (true) { 5932 // Skip class contexts. If someone can cite chapter and verse 5933 // for this behavior, that would be nice --- it's what GCC and 5934 // EDG do, and it seems like a reasonable intent, but the spec 5935 // really only says that checks for unqualified existing 5936 // declarations should stop at the nearest enclosing namespace, 5937 // not that they should only consider the nearest enclosing 5938 // namespace. 5939 while (DC->isRecord()) 5940 DC = DC->getParent(); 5941 5942 LookupQualifiedName(Previous, DC); 5943 5944 // TODO: decide what we think about using declarations. 5945 if (!Previous.empty()) 5946 break; 5947 5948 if (DC->isFileContext()) break; 5949 DC = DC->getParent(); 5950 } 5951 5952 // C++ [class.friend]p1: A friend of a class is a function or 5953 // class that is not a member of the class . . . 5954 // C++0x changes this for both friend types and functions. 5955 // Most C++ 98 compilers do seem to give an error here, so 5956 // we do, too. 5957 if (!Previous.empty() && DC->Equals(CurContext) 5958 && !getLangOptions().CPlusPlus0x) 5959 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5960 } 5961 5962 if (DC->isFileContext()) { 5963 // This implies that it has to be an operator or function. 5964 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5965 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5966 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5967 Diag(Loc, diag::err_introducing_special_friend) << 5968 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5969 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5970 return DeclPtrTy(); 5971 } 5972 } 5973 5974 bool Redeclaration = false; 5975 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5976 move(TemplateParams), 5977 IsDefinition, 5978 Redeclaration); 5979 if (!ND) return DeclPtrTy(); 5980 5981 assert(ND->getDeclContext() == DC); 5982 assert(ND->getLexicalDeclContext() == CurContext); 5983 5984 // Add the function declaration to the appropriate lookup tables, 5985 // adjusting the redeclarations list as necessary. We don't 5986 // want to do this yet if the friending class is dependent. 5987 // 5988 // Also update the scope-based lookup if the target context's 5989 // lookup context is in lexical scope. 5990 if (!CurContext->isDependentContext()) { 5991 DC = DC->getLookupContext(); 5992 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5993 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5994 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5995 } 5996 5997 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5998 D.getIdentifierLoc(), ND, 5999 DS.getFriendSpecLoc()); 6000 FrD->setAccess(AS_public); 6001 CurContext->addDecl(FrD); 6002 6003 return DeclPtrTy::make(ND); 6004} 6005 6006void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6007 AdjustDeclIfTemplate(dcl); 6008 6009 Decl *Dcl = dcl.getAs<Decl>(); 6010 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6011 if (!Fn) { 6012 Diag(DelLoc, diag::err_deleted_non_function); 6013 return; 6014 } 6015 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6016 Diag(DelLoc, diag::err_deleted_decl_not_first); 6017 Diag(Prev->getLocation(), diag::note_previous_declaration); 6018 // If the declaration wasn't the first, we delete the function anyway for 6019 // recovery. 6020 } 6021 Fn->setDeleted(); 6022} 6023 6024static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6025 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6026 ++CI) { 6027 Stmt *SubStmt = *CI; 6028 if (!SubStmt) 6029 continue; 6030 if (isa<ReturnStmt>(SubStmt)) 6031 Self.Diag(SubStmt->getSourceRange().getBegin(), 6032 diag::err_return_in_constructor_handler); 6033 if (!isa<Expr>(SubStmt)) 6034 SearchForReturnInStmt(Self, SubStmt); 6035 } 6036} 6037 6038void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6039 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6040 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6041 SearchForReturnInStmt(*this, Handler); 6042 } 6043} 6044 6045bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6046 const CXXMethodDecl *Old) { 6047 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6048 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6049 6050 if (Context.hasSameType(NewTy, OldTy) || 6051 NewTy->isDependentType() || OldTy->isDependentType()) 6052 return false; 6053 6054 // Check if the return types are covariant 6055 QualType NewClassTy, OldClassTy; 6056 6057 /// Both types must be pointers or references to classes. 6058 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6059 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6060 NewClassTy = NewPT->getPointeeType(); 6061 OldClassTy = OldPT->getPointeeType(); 6062 } 6063 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6064 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6065 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6066 NewClassTy = NewRT->getPointeeType(); 6067 OldClassTy = OldRT->getPointeeType(); 6068 } 6069 } 6070 } 6071 6072 // The return types aren't either both pointers or references to a class type. 6073 if (NewClassTy.isNull()) { 6074 Diag(New->getLocation(), 6075 diag::err_different_return_type_for_overriding_virtual_function) 6076 << New->getDeclName() << NewTy << OldTy; 6077 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6078 6079 return true; 6080 } 6081 6082 // C++ [class.virtual]p6: 6083 // If the return type of D::f differs from the return type of B::f, the 6084 // class type in the return type of D::f shall be complete at the point of 6085 // declaration of D::f or shall be the class type D. 6086 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6087 if (!RT->isBeingDefined() && 6088 RequireCompleteType(New->getLocation(), NewClassTy, 6089 PDiag(diag::err_covariant_return_incomplete) 6090 << New->getDeclName())) 6091 return true; 6092 } 6093 6094 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6095 // Check if the new class derives from the old class. 6096 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6097 Diag(New->getLocation(), 6098 diag::err_covariant_return_not_derived) 6099 << New->getDeclName() << NewTy << OldTy; 6100 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6101 return true; 6102 } 6103 6104 // Check if we the conversion from derived to base is valid. 6105 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6106 diag::err_covariant_return_inaccessible_base, 6107 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6108 // FIXME: Should this point to the return type? 6109 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6110 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6111 return true; 6112 } 6113 } 6114 6115 // The qualifiers of the return types must be the same. 6116 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6117 Diag(New->getLocation(), 6118 diag::err_covariant_return_type_different_qualifications) 6119 << New->getDeclName() << NewTy << OldTy; 6120 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6121 return true; 6122 }; 6123 6124 6125 // The new class type must have the same or less qualifiers as the old type. 6126 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6127 Diag(New->getLocation(), 6128 diag::err_covariant_return_type_class_type_more_qualified) 6129 << New->getDeclName() << NewTy << OldTy; 6130 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6131 return true; 6132 }; 6133 6134 return false; 6135} 6136 6137bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6138 const CXXMethodDecl *Old) 6139{ 6140 if (Old->hasAttr<FinalAttr>()) { 6141 Diag(New->getLocation(), diag::err_final_function_overridden) 6142 << New->getDeclName(); 6143 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6144 return true; 6145 } 6146 6147 return false; 6148} 6149 6150/// \brief Mark the given method pure. 6151/// 6152/// \param Method the method to be marked pure. 6153/// 6154/// \param InitRange the source range that covers the "0" initializer. 6155bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6156 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6157 Method->setPure(); 6158 6159 // A class is abstract if at least one function is pure virtual. 6160 Method->getParent()->setAbstract(true); 6161 return false; 6162 } 6163 6164 if (!Method->isInvalidDecl()) 6165 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6166 << Method->getDeclName() << InitRange; 6167 return true; 6168} 6169 6170/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6171/// an initializer for the out-of-line declaration 'Dcl'. The scope 6172/// is a fresh scope pushed for just this purpose. 6173/// 6174/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6175/// static data member of class X, names should be looked up in the scope of 6176/// class X. 6177void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6178 // If there is no declaration, there was an error parsing it. 6179 Decl *D = Dcl.getAs<Decl>(); 6180 if (D == 0) return; 6181 6182 // We should only get called for declarations with scope specifiers, like: 6183 // int foo::bar; 6184 assert(D->isOutOfLine()); 6185 EnterDeclaratorContext(S, D->getDeclContext()); 6186} 6187 6188/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6189/// initializer for the out-of-line declaration 'Dcl'. 6190void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6191 // If there is no declaration, there was an error parsing it. 6192 Decl *D = Dcl.getAs<Decl>(); 6193 if (D == 0) return; 6194 6195 assert(D->isOutOfLine()); 6196 ExitDeclaratorContext(S); 6197} 6198 6199/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6200/// C++ if/switch/while/for statement. 6201/// e.g: "if (int x = f()) {...}" 6202Action::DeclResult 6203Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6204 // C++ 6.4p2: 6205 // The declarator shall not specify a function or an array. 6206 // The type-specifier-seq shall not contain typedef and shall not declare a 6207 // new class or enumeration. 6208 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6209 "Parser allowed 'typedef' as storage class of condition decl."); 6210 6211 TagDecl *OwnedTag = 0; 6212 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6213 QualType Ty = TInfo->getType(); 6214 6215 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6216 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6217 // would be created and CXXConditionDeclExpr wants a VarDecl. 6218 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6219 << D.getSourceRange(); 6220 return DeclResult(); 6221 } else if (OwnedTag && OwnedTag->isDefinition()) { 6222 // The type-specifier-seq shall not declare a new class or enumeration. 6223 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6224 } 6225 6226 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6227 if (!Dcl) 6228 return DeclResult(); 6229 6230 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6231 VD->setDeclaredInCondition(true); 6232 return Dcl; 6233} 6234 6235void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6236 bool DefinitionRequired) { 6237 // Ignore any vtable uses in unevaluated operands or for classes that do 6238 // not have a vtable. 6239 if (!Class->isDynamicClass() || Class->isDependentContext() || 6240 CurContext->isDependentContext() || 6241 ExprEvalContexts.back().Context == Unevaluated) 6242 return; 6243 6244 // Try to insert this class into the map. 6245 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6246 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6247 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6248 if (!Pos.second) { 6249 // If we already had an entry, check to see if we are promoting this vtable 6250 // to required a definition. If so, we need to reappend to the VTableUses 6251 // list, since we may have already processed the first entry. 6252 if (DefinitionRequired && !Pos.first->second) { 6253 Pos.first->second = true; 6254 } else { 6255 // Otherwise, we can early exit. 6256 return; 6257 } 6258 } 6259 6260 // Local classes need to have their virtual members marked 6261 // immediately. For all other classes, we mark their virtual members 6262 // at the end of the translation unit. 6263 if (Class->isLocalClass()) 6264 MarkVirtualMembersReferenced(Loc, Class); 6265 else 6266 VTableUses.push_back(std::make_pair(Class, Loc)); 6267} 6268 6269bool Sema::DefineUsedVTables() { 6270 // If any dynamic classes have their key function defined within 6271 // this translation unit, then those vtables are considered "used" and must 6272 // be emitted. 6273 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6274 if (const CXXMethodDecl *KeyFunction 6275 = Context.getKeyFunction(DynamicClasses[I])) { 6276 const FunctionDecl *Definition = 0; 6277 if (KeyFunction->getBody(Definition)) 6278 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6279 } 6280 } 6281 6282 if (VTableUses.empty()) 6283 return false; 6284 6285 // Note: The VTableUses vector could grow as a result of marking 6286 // the members of a class as "used", so we check the size each 6287 // time through the loop and prefer indices (with are stable) to 6288 // iterators (which are not). 6289 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6290 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6291 if (!Class) 6292 continue; 6293 6294 SourceLocation Loc = VTableUses[I].second; 6295 6296 // If this class has a key function, but that key function is 6297 // defined in another translation unit, we don't need to emit the 6298 // vtable even though we're using it. 6299 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6300 if (KeyFunction && !KeyFunction->getBody()) { 6301 switch (KeyFunction->getTemplateSpecializationKind()) { 6302 case TSK_Undeclared: 6303 case TSK_ExplicitSpecialization: 6304 case TSK_ExplicitInstantiationDeclaration: 6305 // The key function is in another translation unit. 6306 continue; 6307 6308 case TSK_ExplicitInstantiationDefinition: 6309 case TSK_ImplicitInstantiation: 6310 // We will be instantiating the key function. 6311 break; 6312 } 6313 } else if (!KeyFunction) { 6314 // If we have a class with no key function that is the subject 6315 // of an explicit instantiation declaration, suppress the 6316 // vtable; it will live with the explicit instantiation 6317 // definition. 6318 bool IsExplicitInstantiationDeclaration 6319 = Class->getTemplateSpecializationKind() 6320 == TSK_ExplicitInstantiationDeclaration; 6321 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6322 REnd = Class->redecls_end(); 6323 R != REnd; ++R) { 6324 TemplateSpecializationKind TSK 6325 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6326 if (TSK == TSK_ExplicitInstantiationDeclaration) 6327 IsExplicitInstantiationDeclaration = true; 6328 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6329 IsExplicitInstantiationDeclaration = false; 6330 break; 6331 } 6332 } 6333 6334 if (IsExplicitInstantiationDeclaration) 6335 continue; 6336 } 6337 6338 // Mark all of the virtual members of this class as referenced, so 6339 // that we can build a vtable. Then, tell the AST consumer that a 6340 // vtable for this class is required. 6341 MarkVirtualMembersReferenced(Loc, Class); 6342 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6343 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6344 6345 // Optionally warn if we're emitting a weak vtable. 6346 if (Class->getLinkage() == ExternalLinkage && 6347 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6348 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6349 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6350 } 6351 } 6352 VTableUses.clear(); 6353 6354 return true; 6355} 6356 6357void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6358 const CXXRecordDecl *RD) { 6359 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6360 e = RD->method_end(); i != e; ++i) { 6361 CXXMethodDecl *MD = *i; 6362 6363 // C++ [basic.def.odr]p2: 6364 // [...] A virtual member function is used if it is not pure. [...] 6365 if (MD->isVirtual() && !MD->isPure()) 6366 MarkDeclarationReferenced(Loc, MD); 6367 } 6368 6369 // Only classes that have virtual bases need a VTT. 6370 if (RD->getNumVBases() == 0) 6371 return; 6372 6373 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6374 e = RD->bases_end(); i != e; ++i) { 6375 const CXXRecordDecl *Base = 6376 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6377 if (i->isVirtual()) 6378 continue; 6379 if (Base->getNumVBases() == 0) 6380 continue; 6381 MarkVirtualMembersReferenced(Loc, Base); 6382 } 6383} 6384 6385/// SetIvarInitializers - This routine builds initialization ASTs for the 6386/// Objective-C implementation whose ivars need be initialized. 6387void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6388 if (!getLangOptions().CPlusPlus) 6389 return; 6390 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6391 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6392 CollectIvarsToConstructOrDestruct(OID, ivars); 6393 if (ivars.empty()) 6394 return; 6395 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6396 for (unsigned i = 0; i < ivars.size(); i++) { 6397 FieldDecl *Field = ivars[i]; 6398 if (Field->isInvalidDecl()) 6399 continue; 6400 6401 CXXBaseOrMemberInitializer *Member; 6402 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6403 InitializationKind InitKind = 6404 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6405 6406 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6407 Sema::OwningExprResult MemberInit = 6408 InitSeq.Perform(*this, InitEntity, InitKind, 6409 Sema::MultiExprArg(*this, 0, 0)); 6410 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6411 // Note, MemberInit could actually come back empty if no initialization 6412 // is required (e.g., because it would call a trivial default constructor) 6413 if (!MemberInit.get() || MemberInit.isInvalid()) 6414 continue; 6415 6416 Member = 6417 new (Context) CXXBaseOrMemberInitializer(Context, 6418 Field, SourceLocation(), 6419 SourceLocation(), 6420 MemberInit.takeAs<Expr>(), 6421 SourceLocation()); 6422 AllToInit.push_back(Member); 6423 6424 // Be sure that the destructor is accessible and is marked as referenced. 6425 if (const RecordType *RecordTy 6426 = Context.getBaseElementType(Field->getType()) 6427 ->getAs<RecordType>()) { 6428 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6429 if (CXXDestructorDecl *Destructor 6430 = const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) { 6431 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6432 CheckDestructorAccess(Field->getLocation(), Destructor, 6433 PDiag(diag::err_access_dtor_ivar) 6434 << Context.getBaseElementType(Field->getType())); 6435 } 6436 } 6437 } 6438 ObjCImplementation->setIvarInitializers(Context, 6439 AllToInit.data(), AllToInit.size()); 6440 } 6441} 6442